US20110136496A1 - Dynamic allocation of radio resources - Google Patents
Dynamic allocation of radio resources Download PDFInfo
- Publication number
- US20110136496A1 US20110136496A1 US13/026,724 US201113026724A US2011136496A1 US 20110136496 A1 US20110136496 A1 US 20110136496A1 US 201113026724 A US201113026724 A US 201113026724A US 2011136496 A1 US2011136496 A1 US 2011136496A1
- Authority
- US
- United States
- Prior art keywords
- base station
- neighbor
- radio resources
- radio
- primary set
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
- H04W16/10—Dynamic resource partitioning
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/18—Service support devices; Network management devices
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
Definitions
- the present invention relates in general to allocation of radio resources in mobile communications systems.
- the radio spectrum assigned to a mobile communications system must in general be reused within different geographical sub-areas, so called cells, in order to provide both coverage and capacity.
- so called cells the so called reuse distance between different cells using the same portion of spectrum may however vary. This variation appears, not only between different types of systems, but also within the same system. The latter is due to e.g. the topology of the service area.
- hexagons In practice, to model the cellular layout of a mobile communications system a heterogeneous grid of regular hexagons is often used. Although not providing a true description of the real cell and its coverage area, as an approximation, hexagons have proven useful for cell planning purposes as they provide a convenient framework in which a wide range of tessellating cell-reuse clusters can be defined to describe the distribution of the available spectrum/channel resources over the total service area of a given system.
- N i 2 +ij+j 2 ,
- Enhanced path-loss estimates are here used for assigning channels to different base stations.
- the path-loss estimates are obtained by instructing mobile stations being connected to the system to measure certain neighbouring cell signals and to lock the mobile stations power to enable synchronized measurements in neighbouring base stations. From these measurements, statistics on path-loss estimates are calculated, which in turn are used for improving the frequency planning.
- a general problem with prior-art resource allocation is that the radio resources can not be efficiently utilised in the view of the actual interference situation as experienced by a mobile station at a specific location and at a specific time.
- a general object of the present invention is thus to provide resource allocation devices and methods improving the radio resource utilisation efficiency.
- a further object with the present invention is to utilise local and present signal quality to improve the radio resource utilisation efficiency.
- Another further object with the present invention is to allow for allocation adaptation on very short terms.
- radio resources are allocated to communication between a mobile station and a base station.
- the available set of radio resources may comprise radio resources primarily assigned to a neighbouring cell if the mobile station experience an instantaneous low level of co-channel interference from such neighbouring cells.
- the presence of co-channel interference is preferably deduced from signal quality measurements of pilot signals.
- the allocation may concern uplink and/or downlink communication. Devices for performing the measurements are located in the mobile station, while devices for performing the evaluation, selection and actual allocation can be placed in different parts of the communications system—in the mobile station, in a base station or in a core network node, or as distributed means.
- An advantage of the present invention is that the overall radio resource utilisation may be increased. Furthermore, fluctuations of resource demands on short-term time-scales can be handled efficiently.
- FIG. 1 is a schematic illustration of a cellular communications system
- FIG. 2A is a schematic illustration of reuse of radio resources in a cellular communications system
- FIG. 2B is a diagram illustrating division of radio resource space into subsets
- FIG. 3 is a schematic illustration of an embodiment of a cellular communications system operating according to the present invention.
- FIG. 4A is a block diagram of embodiments of a base station and a mobile station according to the present invention.
- FIG. 4B is a block diagram of other embodiments of a base station and a mobile station according to the present invention.
- FIG. 4C is a block diagram of embodiments of a core network, a base station and a mobile station according to the present invention.
- FIG. 4D is a block diagram of other embodiments of a core network, a base station and a mobile station according to the present invention.
- FIG. 5 is an illustration trying to visualise the disintegration of the conventional reuse concept as a result of the present invention.
- FIG. 6 is a flow diagram of basic steps of an embodiment of a method according to the present invention.
- a fundamental reason for considering reuse larger than one is that it provides means for controlling the impact of co-channel interference (CCI). Since mobile stations at the rim of cells are the ones theoretically most likely to be exposed to CCI, the idea of using a reuse factor larger than one is thus to, at least to some degree, guarantee throughput in all positions of all cells. This is of course highly desirable from a network point-of-view since most mobile stations can be served. However, the approach is conservative. In some positions of a cell, for example, in the area close to the base station but potentially also in other sub-areas, the interference situation may be such that a larger portion of the spectrum could be used without causing strong co-channel interference in other neighbouring cells.
- CCI co-channel interference
- a mobile communications network 1 comprises a core network 10 .
- the core network 10 is in turn connected 12 to external networks.
- a number of base stations 20 : 1 - 20 : 5 are connected to the core network 10 .
- Each base station 20 : 1 - 20 : 5 is responsible for covering a certain respective geographical area or cell 30 : 1 - 30 : 5 .
- the cells 30 : 1 - 30 : 5 are, as a matter of illustrative convenience, represented by hexagons.
- a mobile station being situated within a certain, cell will typically be connected to the communications network via a radio link to the corresponding base station 20 : 1 - 20 : 5 .
- a mobile station being situated at the outer part of a cell will experience signals having relatively high powers also from t-adjacent cells.
- the available radio resources are divided into a number of groups, and each cell has the opportunity to use radio resources within one such group. This is the basic idea of resource reuse.
- FIG. 2A One typical example is illustrated in FIG. 2A .
- the radio resources are divided into three parts, R 1 , R 2 , R 3 , and each cell is allowed to use one of these sets of radio resources.
- the so-called reuse factor is 3.
- FIG. 2B illustrates a volume of the radio resource space.
- the radio resource space is spanned by the quantities time, frequency and code.
- the totally available radio resource space is divided into smaller volumes, which are allocated for communication, uplink or downlink, between a base station and a mobile station.
- the totally available radio resource space is divided in a number of part volumes.
- the totally available radio resource space is divided into three parts, R 1 , R 2 and R 3 , which e.g. could be used as illustrated in FIG. 2A .
- the division in FIG. 2B is made in the frequency dimension, i.e. the radio resources assigned to each cell is defined by a number of frequencies.
- the definition of the part resource spaces can be made in any manner, in time dimension, in code dimension or in any combination thereof.
- the resource space can also be extended into more dimensions, such as the spatial domain.
- FIG. 3 illustrates an embodiment of a mobile communications system according to the present invention.
- a number of base stations 20 : 1 - 3 of which only three have reference numbers, are associated with a respective cell 30 : 1 - 3 .
- a set of radio resources R 4 is primarily assigned to base station 20 : 1
- a set of radio resources R 5 is primarily assigned to base station 20 : 2
- a set of radio resources R 6 is primarily assigned to base station 20 : 3 .
- R 4 , R 5 and R 6 are typically exclusive in relation to each other within expected interference distance, i.e. comprise no common resources if they are likely to give rise to co-channel interference.
- sets of radio resources further away from each other may comprise common resources, i.e. the sets are typically non-exclusive when seen on a larger scale.
- the sets of radio resources are typically assigned according to a reuse plan, but may also be decided in other ways.
- Three mobile stations 40 : 1 - 3 are illustrated to be present within the coverage of cells 30 : 1 and 30 : 2 .
- the mobile station 40 : 1 is situated close to its own base station 20 : 1 and communicates with the base station 20 : 1 by radio resources 50 .
- the mobile station 40 : 2 is situated within cell 30 : 1 , but relatively close to the border to cell 30 : 2 and communicates with the base station 20 : 1 by radio resources 51 .
- the mobile station 40 : 3 is situated within cell 30 : 2 , but relatively close to cell 30 : 3 , and communicates with the base station 20 : 2 by radio resources 52 .
- the mobile station 40 : 1 experiences in general a lot of radio signals 60 from different base stations within the communications system.
- the strongest signals are probably the ones from the own base station 20 : 1 , but normally, also signals from the closest other base stations are possible to detect.
- the signals from the own base station 20 : 1 are probably much stronger than the second strongest signals, in this example probably the signals from base station 20 : 3 .
- the signal strengths from the base stations 20 : 1 and 20 : 2 will probably not differ very much. It is obvious for anyone skilled in the art, that the mobile station 40 : 2 typically is more exposed to co-channel interference than the mobile station 40 : 1 .
- the assignment of radio resources is therefore typically made considering the worst case, e.g. the mobile station 40 : 2 . However, for the mobile station 40 : 1 , a higher utilisation of the radio resources could be of interest.
- a base station is allowed to allocate also radio resources that are not primarily assigned to the base station for use in the entire cell.
- radio resources assigned to neighbouring cells can also be utilised.
- mobile stations can in some situations “borrow” spectrum from other cells. The condition for this is that the co-channel interference situation allows so. This is valid in both uplink and downlink situations.
- mobile stations are in general allowed to utilise the radio resources R 4 -R 6 assigned to a certain cell.
- Mobile station 40 : 1 and 40 : 2 can e.g. communicate with base station 20 : 1 using radio resources within R 4
- mobile station 40 : 3 communicates with base station 20 : 2 using radio resources from R 5 .
- mobile station 40 : 1 which is located close to base station 20 : 1 and far from e.g. base station 20 : 2 (in the radio sense) may also transmit using radio resources from R 5 .
- the reason for this is that the co-channel interference created at base station 20 : 2 is quite small due to the large distance and the fact that mobile station 40 : 1 probably sends at low power.
- the mobile station 40 : 2 cannot use radio resources from R 5 , as this may result in significant interference at base station 20 : 2 and corrupt the possibility for terminals in the corresponding cell 30 : 2 to transmit to base station 20 : 2 .
- the base station In order for the base station to decide whether a higher utilisation of radio resources than primarily assigned may be considered or not when serving a specific mobile station, the base station needs to know the interference situation at the mobile station location when the packet is to actually be transmitted.
- the mobile station measures quality measures of signals transmitted from a multitude of base stations. From these quality measures, an evaluation is made concluding which base stations of the multitude of base stations that do not risk causing any significant co-channel interference. In other words, base stations outside and inside, respectively, a co-channel interference distance or area relative to the first mobile station are determined. Radio resources only used by non-interfering base stations can then be candidates for allocation of communications to and/or from the mobile station in question.
- the set of allowed or available radio resources to select between is unique for each mobile terminal and for each situation.
- the assignments of radio resources for general use by the different base stations are not altered. Instead, the rules for allowing utilisation of resources outside the primarily assigned resources are changed and allows for using resources primarily assigned to neighbouring cells at certain interference situations. In this way, there is no need for a general adaptation of the entire division of the resource space over the entire communications system coverage area.
- the use or “borrowing” of spectrum is made on a temporary basis, connected to a specific mobile station at a specific situation.
- the time-scale of the adaptation can be very fast and may even vary between one burst and the next. Furthermore, no notifications have to be spread over the rest of the communications system.
- the individual mobile stations measure observed pilot powers. Pilot tones or more general pilot signals are transmitted on different sub-carriers or sub-carrier groups from different cells with different reuse cluster identification numbers. The measured pilot signal powers for the different reuse cluster groups are preferably reported prior to that a package is to be sent from the base station to the mobile station. That is, the spectrum allocation is decided based on the received pilot powers and not the actual data traffic. This approach is advantageous since, in contrast to packet data traffic, the transmission of pilot information from the different cells is continuous in time.
- OFDM Orthogonal Frequency Division Multiplexing
- the pilot power measurement report from a mobile station will provide its serving base station with two important pieces of information. Worst-case estimates of the interference levels that can be expected in the neighbouring radio resource spaces, i.e. in all other resources than the ones primarily assigned by the reuse scheme. Note that the actual interference situation most likely is better. Furthermore, it also provides a means for estimating the absolute path loss from the base station to the mobile station by comparing the report received signal power in the allocated frequency band with the known transmitted power. Since the transmission of pilots in all cells is continuous, the obtained interference estimates will be conservative. However, of the same reason making them conservative, they will also be quasi-stationary thus making them valid at the transmission time of the packet if the measurement is requested by the base station sufficiently close in time to the actual transmission time.
- the base station can based on the estimated path loss and some predefined signal-to-interference ratio (SIR) target calculate what transmission powers that are needed in each sub-band in order to convey data to the mobile station with some predefined quality-of-service. If these calculated power levels can be accepted, i.e. they are lower than some maximum values ultimately determined by some network control algorithm or set to some fixed levels proportional to the maximum allowed power in the primarily allocated resources, the base station can decide whether the individual resources can be used or not for data transfer. Finally, depending on the size of the packet to be conveyed and the number of resources that can theoretically be allocated for a given mobile station, the base station can inform the mobile station using for example some logical control channel what resources to consider in the next packet transmission.
- SIR signal-to-interference ratio
- the interference estimates transmitted from the mobiles to the network can also be used to determine the allowed radio resources for a specific mobile in the uplink. If the mobile reports a low power level on downlink frequencies other than its own, e.g. with reference to FIG. 3 , mobile station 40 : 1 is reporting a low interference level on downlink resources of R 5 , it is likely that the mobile is close to its own base station and the network can decide to let the mobile communicate on multiple resources in the uplink, i.e. borrow resources from neighbouring cells. The mobile could also autonomously decide on the bandwidth to use in the uplink transmission based on downlink measurements, although it is preferable to involve the network in the decision process. Activity indicators transmitted from the base stations to the terminals could also be used to decide on the instantaneous uplink radio resource use. If base stations in the neighbourhood all report low traffic intensity in their resources, terminals in neighbouring cells could borrow these resources for uplink transmission.
- FIG. 4A illustrates an embodiment of a communications system according to the present invention having a mobile station 40 and a base station 20 operating together according to the ideas of the present invention.
- the base station 20 is further connected to a core network 10 and nodes 70 therein.
- the mobile station 40 receives a number of signals 60 from surrounding base stations.
- the signals 60 are preferably pilot signals, but other signals, e.g. containing user data, can also be utilised.
- the mobile station 40 comprises means 41 for measuring a quality measure of the signals 54 , 60 . This quality measure may be based on the signal powers, resulting in e.g. a path loss measure, a channel gain measure or different kinds of interference measures.
- the measurements are compiled and transmitted 53 to the base station 20 in a measurement report.
- the base station 20 receives the measurement report.
- the base station 20 comprises in this embodiment evaluation means 22 for evaluating the quality measures associated with the different base stations. More precisely, the evaluation means 22 determines which of the base stations that pose potential co-channel interference problems. In other words, it is determined if the different base stations are inside or outside co-channel interference distance relative to the mobile station 40 .
- the co-channel interference distance being defined e.g. by a C/I threshold ratio.
- the base station 20 of the present embodiment further comprises selection means 23 for obtaining a set of radio resources that the mobile station 40 could be allowed to use. This available set of resources does of course comprise the radio resources primarily assigned to the base station 20 .
- radio resources that are primarily assigned only to base stations outside co-channel interference distance, these radio resources are included in the available set of resources for the specific mobile station 40 .
- the risk for co-channel interference is low even if these resources not primarily assigned to the own base station 20 are used.
- the base station 20 further comprises allocation means 24 , which is responsible for the actual allocation of radio resources for communication between the mobile station 40 and the base station 20 .
- radio resources selected from the available set of radio resources are allocated for downlink communication 54 .
- the allocation is performed to give the mobile station 40 an appropriate quality-of-service in competition with other mobile stations connected to the same base station 40 .
- Each of the connected mobile stations may then have their own available set of resources.
- FIG. 4B illustrates another embodiment of a communications system according to the present invention. Similar parts as in FIG. 4A are denoted by the same reference numbers and are not in general discussed any further.
- the mobile station 40 comprises the measuring means 41 .
- the mobile station 40 also comprises an evaluation means 42 , which by its functionality resembles the corresponding means of the base station in previous embodiment.
- the base station 20 can provide the mobile station 40 with information about relative emission powers between data and pilot signals. Such information can be provided not only for the own base station, but also for base stations that are believed to be within hearing (radio) distance.
- a message 55 is sent from the mobile station 40 to the base station 20 , which message 55 now comprises information about which neighbouring base stations that are experienced as interfering. This information is used in the selection means 23 for obtaining the available set of radio resources for the mobile station 40 .
- the mobile station 40 also is provided with information about the primary assignment of radio resources, also the functionalities performed by the selection means 23 can be performed at the mobile station 40 instead, and in such a case, the mobile station 40 may even suggest which radio resources to use for the subsequent communication.
- the different functionalities of the method according to the present invention can be performed at different parts of the communications system.
- a device for performing a procedure according to the present invention typically is a distributed means.
- the measurement of the base station signals has to be performed at the mobile station. However, the remaining steps can be performed where it is appropriate for each implementation.
- FIG. 4C illustrates another embodiment of a communications system according to the present invention.
- the measurements are performed at the mobile station 40 and a measurement report 53 is provided to the base station 20 .
- the base station 20 forwards the information to a node 70 in the core network 10 .
- the node 70 then comprises evaluation means 72 and selection means 73 in analogy with earlier embodiments.
- the available set of radio resources is then communicated back to the base station 20 as a basis for the final allocation of the downlink traffic.
- FIG. 4D is to most parts identical to FIG. 4C , but the available set of radio resources now comprises resources intended for uplink communication 56 .
- the mobile station 40 measures the signals from the neighbouring base stations as before and sends a measurement report to the base stations 20 , which forwards the information to a node 70 in the core network 10 .
- the basic idea when allocating uplink traffic is that a mobile station that does not experience interference from other base stations is less likely to create interference with the same base stations.
- the node 70 may e.g. perform an actual C/I estimation and using C/I measures over a certain threshold as indications of presumed co-channel interference.
- the node 70 may preferably also use additional geographical knowledge about the communications system to refine the evaluation of the interference situation. Other complementary information may be activity indicators from neighbouring cells.
- the node 70 may also set a maximum emission power that is allowed to be used for each resource. Such power limitations can then be taken into account when allocating resources for the uplink communication 56 .
- uplink resources and downlink resources can preferably be combined.
- FIG. 5 tries to illustrate this condition.
- the figure illustrates a number of cells 30 as hexagons.
- a radio sense of each cell 30 , a certain portion of radio resources can be utilised. Since the risk for interference from neighbouring cells is large, a “reuse” factor larger than 1 is typically used.
- the interference risk is much lower, and basically all radio resources can be utilised. This corresponds to a reuse factor of 1.
- the risk for interference with certain base stations is large, while it still is small for other base stations. This means that some additional resources are available, as compared with the outer part 31 .
- there is a restriction in the allowed radio resources As anyone skilled in the art understands, there is of course a smooth transition between these different stages, and the locations may vary from one cell to another or for one mobile station to another.
- FIG. 6 illustrates a flow diagram of the basic steps of an embodiment of a method according to the present invention.
- This embodiment corresponds basically to the system illustrated in FIG. 4A .
- the procedure starts in step 200 .
- step 202 quality measures of signals from all base stations within bearable distance are measured at a mobile station.
- step 204 the measurements are reported to a base station.
- step 206 it is evaluated which base stations are within or outside interfering radio distance with the mobile station. Based on the result of step 206 , an available set of resources is selected in step 208 .
- This selection comprises resources primarily assigned to the own base stations as well as resources assigned only to non-interfering base stations.
- step 210 resources from the available set of resources are allocated for communication between the mobile station and the base stations.
- the data is then sent using the allocated resources in step 212 .
- the procedure ends in step 214 .
Abstract
Radio resources are allocated to communication between a mobile station and a base station. The available set of radio resources may comprise radio resources primarily assigned to a neighboring cell if the 5 mobile station experience an instantaneous low level of co-channel interference from such neighboring cells. The existence of interference is preferably deduced from signal quality measurements of pilot signals. The allocation may concern uplink and/or downlink communication. Devices for performing the measurements are located in the mobile station, while devices for performing the evaluation, selection and actual allocation can be placed in different parts of the communications system-in the mobile station, in a base station or in a core network node, or as a distributed means.
Description
- The present invention relates in general to allocation of radio resources in mobile communications systems.
- The radio spectrum assigned to a mobile communications system must in general be reused within different geographical sub-areas, so called cells, in order to provide both coverage and capacity. Depending on technology choices and factors such as what multiple access techniques that is employed and how robust to interference the mobile and base station receivers are, the so called reuse distance between different cells using the same portion of spectrum may however vary. This variation appears, not only between different types of systems, but also within the same system. The latter is due to e.g. the topology of the service area.
- In practice, to model the cellular layout of a mobile communications system a heterogeneous grid of regular hexagons is often used. Although not providing a true description of the real cell and its coverage area, as an approximation, hexagons have proven useful for cell planning purposes as they provide a convenient framework in which a wide range of tessellating cell-reuse clusters can be defined to describe the distribution of the available spectrum/channel resources over the total service area of a given system.
- It is known that tessellating clusters of size N can be constructed if
-
N=i 2 +ij+j 2, - where i and j are non-negative integers and i≧j. From the relation above, it follows that the allowable cluster sizes are N=1, 3, 4, 7, 9, 12, . . . .
- Clearly, to optimise the spectrum efficiency of a given system, it is desirable to use an as small cluster reuse factor as possible. However, unless spread spectrum or space division multiplexing techniques are used, employing small reuse factors may not be possible since the impact of co-channel interference from neighbouring cells may become too severe. That is, the impact of co-channel interference may potentially wreck the ability of the receivers in the different cells to demodulate and recover their intended data meeting quality of service expectations. To circumvent this problem and to gain control over the emission and impact of co-channel interference reuse factors larger than one are typically used in many systems in real life.
- Employing a fixed reuse factor larger than one automatically implies that only a portion of the available system bandwidth is offered to any mobile station in a given cell. This is clearly, both from a network point-of-view as well as from a user perspective, non-advantageous for many reasons. A small selection of such reasons are:
-
- The maximum peak throughput rate is reduced.
- The mobile station exposure to co-channel interference increases as the transmission time increases. Hence, the probability that base stations in nearby cells simultaneously transmits packets to different users using the same channel resources increases.
- Base station emission period of interference into neighbouring cells increases.
- The accessibility of the channel resource is reduced. Serving many mobile stations, the delay in the base station may become substantial. This will be due to both the actual transmission time but also to the time required for retransmissions.
- Linked to the reduced peak data rate and the deteriorated channel accessibility is also the risk that the user perception of the air-interface as being slow may increase.
- One example of frequency planning is disclosed in the U.S. Pat. No. 6,498,934. Enhanced path-loss estimates are here used for assigning channels to different base stations. The path-loss estimates are obtained by instructing mobile stations being connected to the system to measure certain neighbouring cell signals and to lock the mobile stations power to enable synchronized measurements in neighbouring base stations. From these measurements, statistics on path-loss estimates are calculated, which in turn are used for improving the frequency planning.
- In the published US patent application 2003/0013451 A1, a method is disclosed, where the reuse plan for the cells of a communications system is dynamically redefined. Based on a number of factors, such as the observed interference levels, loading conditions, system requirements etc, the reuse plan for the division of resources to the different cells can be adapted. The publication also discloses methods for efficient allocation of resources within the available set of resources for each cell.
- A problem with the reuse plan adaptation presented in US 2003/0013451 A1 is that the entire communications system has to involved in the adaptation. Resources that are influenced by the adaptation have to be unused and system configuration data has to be updated throughout the entire system before the new reuse plan can be utilised. This problem makes it less advantageous to use the adaptation ideas, at least for adapting to short-term changes in the communications system.
- A general problem with prior-art resource allocation is that the radio resources can not be efficiently utilised in the view of the actual interference situation as experienced by a mobile station at a specific location and at a specific time.
- A general object of the present invention is thus to provide resource allocation devices and methods improving the radio resource utilisation efficiency. A further object with the present invention is to utilise local and present signal quality to improve the radio resource utilisation efficiency. Another further object with the present invention is to allow for allocation adaptation on very short terms.
- The above objects are achieved by methods and arrangements according to the enclosed claims. In general, radio resources are allocated to communication between a mobile station and a base station. The available set of radio resources may comprise radio resources primarily assigned to a neighbouring cell if the mobile station experience an instantaneous low level of co-channel interference from such neighbouring cells. The presence of co-channel interference is preferably deduced from signal quality measurements of pilot signals. The allocation may concern uplink and/or downlink communication. Devices for performing the measurements are located in the mobile station, while devices for performing the evaluation, selection and actual allocation can be placed in different parts of the communications system—in the mobile station, in a base station or in a core network node, or as distributed means.
- An advantage of the present invention is that the overall radio resource utilisation may be increased. Furthermore, fluctuations of resource demands on short-term time-scales can be handled efficiently.
- The invention, together with further objects and advantages thereof, may best be understood by making reference to the following description taken together with the accompanying drawings, in which:
-
FIG. 1 is a schematic illustration of a cellular communications system; -
FIG. 2A is a schematic illustration of reuse of radio resources in a cellular communications system; -
FIG. 2B is a diagram illustrating division of radio resource space into subsets; -
FIG. 3 is a schematic illustration of an embodiment of a cellular communications system operating according to the present invention; -
FIG. 4A is a block diagram of embodiments of a base station and a mobile station according to the present invention; -
FIG. 4B is a block diagram of other embodiments of a base station and a mobile station according to the present invention; -
FIG. 4C is a block diagram of embodiments of a core network, a base station and a mobile station according to the present invention; -
FIG. 4D is a block diagram of other embodiments of a core network, a base station and a mobile station according to the present invention; -
FIG. 5 is an illustration trying to visualise the disintegration of the conventional reuse concept as a result of the present invention; and -
FIG. 6 is a flow diagram of basic steps of an embodiment of a method according to the present invention. - A fundamental reason for considering reuse larger than one is that it provides means for controlling the impact of co-channel interference (CCI). Since mobile stations at the rim of cells are the ones theoretically most likely to be exposed to CCI, the idea of using a reuse factor larger than one is thus to, at least to some degree, guarantee throughput in all positions of all cells. This is of course highly desirable from a network point-of-view since most mobile stations can be served. However, the approach is conservative. In some positions of a cell, for example, in the area close to the base station but potentially also in other sub-areas, the interference situation may be such that a larger portion of the spectrum could be used without causing strong co-channel interference in other neighbouring cells. That is, if only mobile stations were present in such areas, a smaller reuse factor could be used. This observation fowls the basis on which the invention described in the present disclosure takes advantage of. The actual interference situation in the part of the cell where a mobile station is present may permit traffic to be conducted using a larger portion of the system bandwidth than was originally granted by the reuse scheme primarily applied.
- In order to illustrate this basic idea, a general mobile communications network will first be discussed. In
FIG. 1 , amobile communications network 1 comprises acore network 10. Thecore network 10 is in turn connected 12 to external networks. A number of base stations 20:1-20:5 are connected to thecore network 10. Each base station 20:1-20:5 is responsible for covering a certain respective geographical area or cell 30:1-30:5. In the present disclosure, the cells 30:1-30:5 are, as a matter of illustrative convenience, represented by hexagons. A mobile station being situated within a certain, cell will typically be connected to the communications network via a radio link to the corresponding base station 20:1-20:5. - A mobile station being situated at the outer part of a cell will experience signals having relatively high powers also from t-adjacent cells. In order to counteract interference between the different cells, only a part of the totally the available radio resources is in a typical case used in each cell. In a commonly used manner, the available resources are divided into a number of groups, and each cell has the opportunity to use radio resources within one such group. This is the basic idea of resource reuse. One typical example is illustrated in
FIG. 2A . Here, the radio resources are divided into three parts, R1, R2, R3, and each cell is allowed to use one of these sets of radio resources. In the illustrated example, the so-called reuse factor is 3. One can immediately notice that the same radio resources are not used in any adjacent cells, but are used in cells further away. -
FIG. 2B illustrates a volume of the radio resource space. In this illustration, the radio resource space is spanned by the quantities time, frequency and code. Depending on the actual radio techniques used, the totally available radio resource space is divided into smaller volumes, which are allocated for communication, uplink or downlink, between a base station and a mobile station. When a reuse plan is applied, the totally available radio resource space is divided in a number of part volumes. InFIG. 2B , the totally available radio resource space is divided into three parts, R1, R2 and R3, which e.g. could be used as illustrated inFIG. 2A . The division inFIG. 2B is made in the frequency dimension, i.e. the radio resources assigned to each cell is defined by a number of frequencies. However, the definition of the part resource spaces can be made in any manner, in time dimension, in code dimension or in any combination thereof. The resource space can also be extended into more dimensions, such as the spatial domain. -
FIG. 3 illustrates an embodiment of a mobile communications system according to the present invention. A number of base stations 20:1-3 of which only three have reference numbers, are associated with a respective cell 30:1-3. A set of radio resources R4 is primarily assigned to base station 20:1, a set of radio resources R5 is primarily assigned to base station 20:2, and a set of radio resources R6 is primarily assigned tobase station 20:3. R4, R5 and R6 are typically exclusive in relation to each other within expected interference distance, i.e. comprise no common resources if they are likely to give rise to co-channel interference. However, sets of radio resources further away from each other may comprise common resources, i.e. the sets are typically non-exclusive when seen on a larger scale. The sets of radio resources are typically assigned according to a reuse plan, but may also be decided in other ways. - Three mobile stations 40:1-3 are illustrated to be present within the coverage of cells 30:1 and 30:2. The mobile station 40:1 is situated close to its own base station 20:1 and communicates with the base station 20:1 by
radio resources 50. The mobile station 40:2 is situated within cell 30:1, but relatively close to the border to cell 30:2 and communicates with the base station 20:1 byradio resources 51. Themobile station 40:3 is situated within cell 30:2, but relatively close to cell 30:3, and communicates with the base station 20:2 byradio resources 52. - The mobile station 40:1 experiences in general a lot of
radio signals 60 from different base stations within the communications system. The strongest signals are probably the ones from the own base station 20:1, but normally, also signals from the closest other base stations are possible to detect. For the mobile station 40:1, being situated close to its own base station 20:1, the signals from the own base station 20:1 are probably much stronger than the second strongest signals, in this example probably the signals frombase station 20:3. However, for the mobile station 40:2, the signal strengths from the base stations 20:1 and 20:2 will probably not differ very much. It is obvious for anyone skilled in the art, that the mobile station 40:2 typically is more exposed to co-channel interference than the mobile station 40:1. The assignment of radio resources is therefore typically made considering the worst case, e.g. the mobile station 40:2. However, for the mobile station 40:1, a higher utilisation of the radio resources could be of interest. - According to an embodiment of the present invention, a base station is allowed to allocate also radio resources that are not primarily assigned to the base station for use in the entire cell. In certain cases, i.e. for certain mobile stations situated at certain locations or having certain interference situations, radio resources assigned to neighbouring cells can also be utilised. In other words, with variable resource allocation according to the present invention, mobile stations can in some situations “borrow” spectrum from other cells. The condition for this is that the co-channel interference situation allows so. This is valid in both uplink and downlink situations.
- In the uplink scenario, and with reference to
FIG. 3 , mobile stations are in general allowed to utilise the radio resources R4-R6 assigned to a certain cell. Mobile station 40:1 and 40:2 can e.g. communicate with base station 20:1 using radio resources within R4, whilemobile station 40:3 communicates with base station 20:2 using radio resources from R5. However, mobile station 40:1, which is located close to base station 20:1 and far from e.g. base station 20:2 (in the radio sense) may also transmit using radio resources from R5. The reason for this is that the co-channel interference created at base station 20:2 is quite small due to the large distance and the fact that mobile station 40:1 probably sends at low power. The mobile station 40:2, on the other hand, cannot use radio resources from R5, as this may result in significant interference at base station 20:2 and corrupt the possibility for terminals in the corresponding cell 30:2 to transmit to base station 20:2. - In the downlink scenario, the situation is similar. To ensure good performance for mobile station 40:2, downlink transmission from base station 20:1 to mobile station 40:2 is only using the resources of R4. However, for the mobile station 40:1, the situation is somewhat different as it is located far from other base stations than base station 20:1. Hence, transmission to mobile station 40:1 from base station 20:1 may use also resources from R5 and R6 (provided that the mobile station 40:1 reports a sufficiently low interference level on frequencies other than within R4).
- In order for the base station to decide whether a higher utilisation of radio resources than primarily assigned may be considered or not when serving a specific mobile station, the base station needs to know the interference situation at the mobile station location when the packet is to actually be transmitted. In a general case, the mobile station measures quality measures of signals transmitted from a multitude of base stations. From these quality measures, an evaluation is made concluding which base stations of the multitude of base stations that do not risk causing any significant co-channel interference. In other words, base stations outside and inside, respectively, a co-channel interference distance or area relative to the first mobile station are determined. Radio resources only used by non-interfering base stations can then be candidates for allocation of communications to and/or from the mobile station in question.
- It is here important to notice that the set of allowed or available radio resources to select between is unique for each mobile terminal and for each situation. The assignments of radio resources for general use by the different base stations are not altered. Instead, the rules for allowing utilisation of resources outside the primarily assigned resources are changed and allows for using resources primarily assigned to neighbouring cells at certain interference situations. In this way, there is no need for a general adaptation of the entire division of the resource space over the entire communications system coverage area. The use or “borrowing” of spectrum is made on a temporary basis, connected to a specific mobile station at a specific situation. The time-scale of the adaptation can be very fast and may even vary between one burst and the next. Furthermore, no notifications have to be spread over the rest of the communications system.
- In most communications systems, packed data transmissions are typically by nature bursty. This poses a potential problem, since the mobile station may not be able to establish an accurate interference situation estimate based on the actual interference seen at a certain time instant or period in data signals, that is valid at the time of the base station's actual transmission. In a preferred embodiment of the present invention, typically in an Orthogonal Frequency Division Multiplexing (OFDM) based system, the individual mobile stations measure observed pilot powers. Pilot tones or more general pilot signals are transmitted on different sub-carriers or sub-carrier groups from different cells with different reuse cluster identification numbers. The measured pilot signal powers for the different reuse cluster groups are preferably reported prior to that a package is to be sent from the base station to the mobile station. That is, the spectrum allocation is decided based on the received pilot powers and not the actual data traffic. This approach is advantageous since, in contrast to packet data traffic, the transmission of pilot information from the different cells is continuous in time.
- If the power of the pilot carriers transmitted in all cells defines the cells, i.e. no other carrier in a given cell is transmitted with a higher power than the pilot carriers, the pilot power measurement report from a mobile station will provide its serving base station with two important pieces of information. Worst-case estimates of the interference levels that can be expected in the neighbouring radio resource spaces, i.e. in all other resources than the ones primarily assigned by the reuse scheme. Note that the actual interference situation most likely is better. Furthermore, it also provides a means for estimating the absolute path loss from the base station to the mobile station by comparing the report received signal power in the allocated frequency band with the known transmitted power. Since the transmission of pilots in all cells is continuous, the obtained interference estimates will be conservative. However, of the same reason making them conservative, they will also be quasi-stationary thus making them valid at the transmission time of the packet if the measurement is requested by the base station sufficiently close in time to the actual transmission time.
- Thus, given a measurement report from a mobile station, the base station can based on the estimated path loss and some predefined signal-to-interference ratio (SIR) target calculate what transmission powers that are needed in each sub-band in order to convey data to the mobile station with some predefined quality-of-service. If these calculated power levels can be accepted, i.e. they are lower than some maximum values ultimately determined by some network control algorithm or set to some fixed levels proportional to the maximum allowed power in the primarily allocated resources, the base station can decide whether the individual resources can be used or not for data transfer. Finally, depending on the size of the packet to be conveyed and the number of resources that can theoretically be allocated for a given mobile station, the base station can inform the mobile station using for example some logical control channel what resources to consider in the next packet transmission.
- The interference estimates transmitted from the mobiles to the network can also be used to determine the allowed radio resources for a specific mobile in the uplink. If the mobile reports a low power level on downlink frequencies other than its own, e.g. with reference to
FIG. 3 , mobile station 40:1 is reporting a low interference level on downlink resources of R5, it is likely that the mobile is close to its own base station and the network can decide to let the mobile communicate on multiple resources in the uplink, i.e. borrow resources from neighbouring cells. The mobile could also autonomously decide on the bandwidth to use in the uplink transmission based on downlink measurements, although it is preferable to involve the network in the decision process. Activity indicators transmitted from the base stations to the terminals could also be used to decide on the instantaneous uplink radio resource use. If base stations in the neighbourhood all report low traffic intensity in their resources, terminals in neighbouring cells could borrow these resources for uplink transmission. - Although the present disclosure basically involves the context for frequency reuse and OFDM systems, the use of the invention is not limited to this case. Other transmission technologies, e.g. CDMA, and reuse in other dimensions than frequency is possible.
-
FIG. 4A illustrates an embodiment of a communications system according to the present invention having amobile station 40 and abase station 20 operating together according to the ideas of the present invention. Thebase station 20 is further connected to acore network 10 andnodes 70 therein. Themobile station 40 receives a number ofsignals 60 from surrounding base stations. As mentioned above, thesignals 60 are preferably pilot signals, but other signals, e.g. containing user data, can also be utilised. Themobile station 40 comprises means 41 for measuring a quality measure of thesignals base station 20 in a measurement report. - The
base station 20 receives the measurement report. Thebase station 20 comprises in this embodiment evaluation means 22 for evaluating the quality measures associated with the different base stations. More precisely, the evaluation means 22 determines which of the base stations that pose potential co-channel interference problems. In other words, it is determined if the different base stations are inside or outside co-channel interference distance relative to themobile station 40. The co-channel interference distance being defined e.g. by a C/I threshold ratio. Thebase station 20 of the present embodiment further comprises selection means 23 for obtaining a set of radio resources that themobile station 40 could be allowed to use. This available set of resources does of course comprise the radio resources primarily assigned to thebase station 20. Furthermore, if there are other radio resources that are primarily assigned only to base stations outside co-channel interference distance, these radio resources are included in the available set of resources for the specificmobile station 40. The risk for co-channel interference is low even if these resources not primarily assigned to theown base station 20 are used. - The
base station 20 further comprises allocation means 24, which is responsible for the actual allocation of radio resources for communication between themobile station 40 and thebase station 20. In this embodiment, radio resources selected from the available set of radio resources are allocated fordownlink communication 54. The allocation is performed to give themobile station 40 an appropriate quality-of-service in competition with other mobile stations connected to thesame base station 40. Each of the connected mobile stations may then have their own available set of resources. By utilising allowed resources that are not primarily assigned to thebase station 20 to mobile stations having a favourable interference situation, the resources primarily assigned to thebase station 20 can be saved for any mobile stations being more exposed to co-channel interference. A higher utilisation degree of the total radio resource can thus be achieved. -
FIG. 4B illustrates another embodiment of a communications system according to the present invention. Similar parts as inFIG. 4A are denoted by the same reference numbers and are not in general discussed any further. In the present embodiment, themobile station 40 comprises the measuring means 41. However, in this embodiment, themobile station 40 also comprises an evaluation means 42, which by its functionality resembles the corresponding means of the base station in previous embodiment. Thebase station 20 can provide themobile station 40 with information about relative emission powers between data and pilot signals. Such information can be provided not only for the own base station, but also for base stations that are believed to be within hearing (radio) distance. Amessage 55 is sent from themobile station 40 to thebase station 20, whichmessage 55 now comprises information about which neighbouring base stations that are experienced as interfering. This information is used in the selection means 23 for obtaining the available set of radio resources for themobile station 40. - If the
mobile station 40 also is provided with information about the primary assignment of radio resources, also the functionalities performed by the selection means 23 can be performed at themobile station 40 instead, and in such a case, themobile station 40 may even suggest which radio resources to use for the subsequent communication. - The different functionalities of the method according to the present invention can be performed at different parts of the communications system. This means that a device for performing a procedure according to the present invention typically is a distributed means. The measurement of the base station signals has to be performed at the mobile station. However, the remaining steps can be performed where it is appropriate for each implementation.
-
FIG. 4C illustrates another embodiment of a communications system according to the present invention. In this embodiment, the measurements are performed at themobile station 40 and ameasurement report 53 is provided to thebase station 20. However, in this embodiment, thebase station 20 forwards the information to anode 70 in thecore network 10. Thenode 70 then comprises evaluation means 72 and selection means 73 in analogy with earlier embodiments. The available set of radio resources is then communicated back to thebase station 20 as a basis for the final allocation of the downlink traffic. -
FIG. 4D is to most parts identical toFIG. 4C , but the available set of radio resources now comprises resources intended foruplink communication 56. Themobile station 40 measures the signals from the neighbouring base stations as before and sends a measurement report to thebase stations 20, which forwards the information to anode 70 in thecore network 10. The basic idea when allocating uplink traffic is that a mobile station that does not experience interference from other base stations is less likely to create interference with the same base stations. Thenode 70 may e.g. perform an actual C/I estimation and using C/I measures over a certain threshold as indications of presumed co-channel interference. Thenode 70 may preferably also use additional geographical knowledge about the communications system to refine the evaluation of the interference situation. Other complementary information may be activity indicators from neighbouring cells. - When selecting the available set of radio resources, the
node 70 may also set a maximum emission power that is allowed to be used for each resource. Such power limitations can then be taken into account when allocating resources for theuplink communication 56. - As anyone skilled in the art understands, allocation of uplink resources and downlink resources can preferably be combined.
- In a conventional cellular communications system, the concept of “reuse” is often used. The reuse is then defined with a cell basis, i.e. each cell is assigned a certain part of the radio resources. The present invention will, however, disintegrate of the conventional reuse concept, since each individual mobile station may have its own set of allowable radio resources.
FIG. 5 tries to illustrate this condition. The figure illustrates a number ofcells 30 as hexagons. In theouter part 31, in a radio sense, of eachcell 30, a certain portion of radio resources can be utilised. Since the risk for interference from neighbouring cells is large, a “reuse” factor larger than 1 is typically used. In aninner part 33, in a radio sense, of eachcell 30, the interference risk is much lower, and basically all radio resources can be utilised. This corresponds to a reuse factor of 1. In anintermediate part 32, in a radio sense, of eachcell 30, the risk for interference with certain base stations is large, while it still is small for other base stations. This means that some additional resources are available, as compared with theouter part 31. However, compared with theinner part 33, there is a restriction in the allowed radio resources. As anyone skilled in the art understands, there is of course a smooth transition between these different stages, and the locations may vary from one cell to another or for one mobile station to another. -
FIG. 6 illustrates a flow diagram of the basic steps of an embodiment of a method according to the present invention. This embodiment corresponds basically to the system illustrated inFIG. 4A . The procedure starts instep 200. Instep 202, quality measures of signals from all base stations within bearable distance are measured at a mobile station. Instep 204, the measurements are reported to a base station. Instep 206, it is evaluated which base stations are within or outside interfering radio distance with the mobile station. Based on the result ofstep 206, an available set of resources is selected instep 208. This selection comprises resources primarily assigned to the own base stations as well as resources assigned only to non-interfering base stations. Instep 210, resources from the available set of resources are allocated for communication between the mobile station and the base stations. The data is then sent using the allocated resources instep 212. The procedure ends instep 214. - The embodiments described above are to be understood as a few illustrative examples of the present invention. It will be understood by those skilled in the art that various modifications, combinations and changes may be made to the embodiments without departing from the scope of the present invention. In particular, different part solutions in the different embodiments can be combined in other configurations, where technically possible. The scope of the present invention is, however, defined by the appended claims.
-
- U.S. Pat. No. 6,498,934
- US 2003/0013451 A1
Claims (11)
1-18. (canceled)
19. A base station of a radio communications system, comprising:
evaluation means arranged to determine a radio resource reuse area occupied by a mobile terminal (occupied reuse area) based on a quality report from said mobile terminal, the quality report including a report of quality measures of signals transmitted from a plurality of base stations measured at said mobile terminal;
selection means arranged to select a set of one or more radio resources allowed to be used (allowed resource set) based on the occupied reuse area; and
allocation means arranged to allocate one or more radio resources from the allowed resource set for use in actual communication (actual radio resource(s)) between said mobile terminal and said base station, wherein
the occupied reuse area is one of a plurality of radio resource reuse areas of said base station, the plurality of radio resource use areas including at least an inner part that encloses said base station, an intermediate part that encloses the inner part, and an outer part that encloses the intermediate part and bounded by a cell of said base station, and
a reuse factor of radio resources is highest for the outer part and lowest for the inner part.
20. The base station according to claim 19 , wherein the reuse factor for the inner part is substantially one.
21. The base station according to claim 19 , wherein
said radio communication system includes one or more neighbor base stations such that the cell of said base station is directly adjacent to each cell of said one or more neighbor base stations,
a primary set of radio resources is assigned to each base station including said base station (main primary set) and said neighbor base station(s) (neighbor primary set(s)) such that the main primary set has no radio resources in common with any of the neighbor primary set(s),
when the occupied reuse area is the outer part, the allowed resource set includes at most the main primary set,
when the occupied reuse area is the intermediate part, the allowed resource set includes the main primary set and one or more radio resources of the neighbor primary set of at least one neighbor base station, and
when the occupied reuse area is the in part, the allowed resource set includes substantially all radio resources available to the radio communication system.
22. The base station according to claim 21 , wherein when the allowed resource set includes radio resource(s) other than the main primary set, said allocation means is arranged to prioritize allocating the radio resources not in the main primary set over the radio resources in the primary set.
23. The base station according to claim 21 , wherein,
said evaluation means is arranged to determine which of said neighbor base station(s) would contribute to a co-channel interference (CCI) experienced by said mobile terminal being at or above a predetermined unacceptable CCI level based on the quality report, and
said selection means is arranged to exclude, from the allowed resource set, the neighbor primary set(s) of said neighbor base station(s) contributing to the unacceptable CCI level, and include, in the allowed resource set, the neighbor primary set(s) of said neighbor base station(s) not contributing to the unacceptable CCI level.
24. The base station according to claim 21 , wherein
said evaluation means is arranged to send information on relative emission powers between data and pilot signals transmitted by said plurality of base stations to said mobile terminal, and receive a determination of which of said neighbor base station(s) would contribute to being at or above a predetermined unacceptable co-channel interference (CCI) level from said mobile terminal, and
said selection means is arranged to exclude, from the allowed resource set, the neighbor primary set of said neighbor base station(s) contributing to the unacceptable CCI level, and include, in the allowed resource set, the neighbor primary set of said neighbor base station(s) not contributing to the unacceptable CCI level.
25. The base station according to claim 21 , wherein said selection means is arranged to send information on relative emission powers between data and pilot signals transmitted by said plurality of base stations and information on the main primary set and the neighbor primary set(s) to said mobile terminal, and the allowed resource set from said mobile terminal.
26. The base station according to claim 21 , wherein
said evaluation means is arranged to relay the quality report to a core network node, and receive a determination of which of said neighbor base station(s) would contribute to being at or above a predetermined unacceptable co-channel interference (CCI) level from said core network node, and
said selection means is arranged to exclude, from the allowed resource set, the neighbor primary set of said neighbor base station(s) contributing to the unacceptable CCI level, and include, in the allowed resource set, the neighbor primary set of said neighbor base station(s) not contributing to the unacceptable CCI level.
27. The base station according to claim 21 , wherein
said evaluation means is arranged to relay the quality report to a core network node, and
said selection means is arranged to receive the allowed resource set from said core network node.
28. The base station according to claim 19 , wherein said selection means and said allocation means operate independently of other base stations in said radio communication.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/026,724 US20110136496A1 (en) | 2004-04-19 | 2011-02-14 | Dynamic allocation of radio resources |
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04101597.5 | 2004-04-19 | ||
EP04101597A EP1589776A1 (en) | 2004-04-19 | 2004-04-19 | Dynamic allocation of radio resources |
PCT/EP2005/051408 WO2005101882A1 (en) | 2004-04-19 | 2005-03-29 | Dynamic allocation of radio resources |
US57851506A | 2006-10-16 | 2006-10-16 | |
US13/026,724 US20110136496A1 (en) | 2004-04-19 | 2011-02-14 | Dynamic allocation of radio resources |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2005/051408 Continuation WO2005101882A1 (en) | 2004-04-19 | 2005-03-29 | Dynamic allocation of radio resources |
US57851506A Continuation | 2004-04-19 | 2006-10-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20110136496A1 true US20110136496A1 (en) | 2011-06-09 |
Family
ID=34928974
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/578,515 Active 2027-01-19 US7912475B2 (en) | 2004-04-19 | 2005-03-29 | Dynamic allocation of radio resources |
US13/026,724 Abandoned US20110136496A1 (en) | 2004-04-19 | 2011-02-14 | Dynamic allocation of radio resources |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/578,515 Active 2027-01-19 US7912475B2 (en) | 2004-04-19 | 2005-03-29 | Dynamic allocation of radio resources |
Country Status (14)
Country | Link |
---|---|
US (2) | US7912475B2 (en) |
EP (2) | EP1589776A1 (en) |
JP (1) | JP4695135B2 (en) |
KR (1) | KR100891848B1 (en) |
CN (1) | CN1943263B (en) |
AT (1) | ATE410898T1 (en) |
AU (1) | AU2005234534B2 (en) |
CA (1) | CA2559448C (en) |
DE (1) | DE602005010233D1 (en) |
HK (1) | HK1105063A1 (en) |
PL (1) | PL1741307T3 (en) |
RU (1) | RU2378762C2 (en) |
TW (1) | TWI388226B (en) |
WO (1) | WO2005101882A1 (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070288892A1 (en) * | 2006-03-24 | 2007-12-13 | The Mathworks, Inc. | System and method for providing and using meta-data in a dynamically typed array-based language |
US20100151876A1 (en) * | 2008-12-12 | 2010-06-17 | Electronics And Telecommunications Research Institute | Apparatus and method for controlling inter-cell interference |
US20100254344A1 (en) * | 2009-04-07 | 2010-10-07 | Mediatek Inc And National Taiwan University | Mechanism of dynamic resource transaction for wireless OFDMA systems |
US20100304753A1 (en) * | 2007-12-03 | 2010-12-02 | Fujitsu Limited | Uplink Transmit Power Control Method, Communication Terminal Unit, Base Station Unit, And Mobile Communication System |
US20110134876A1 (en) * | 2008-08-12 | 2011-06-09 | Hitachi, Ltd. | Wireless Communication System, Wireless Communication Device, and Wireless Resource Management Method |
US20110286346A1 (en) * | 2010-04-13 | 2011-11-24 | Qualcomm Incorporated | Measurement of received power and received quality in a wireless communication network |
US20120034865A1 (en) * | 2009-05-19 | 2012-02-09 | Fujitsu Limited | Base station, relay station, communication system, and communication method |
US20140004881A1 (en) * | 2011-02-14 | 2014-01-02 | Andrew Llc | System and Method for Mobile Location By Dynamic Clustering |
US9097784B2 (en) | 2007-02-05 | 2015-08-04 | Commscope Technologies Llc | System and method to collect and modify calibration data |
US10070430B2 (en) | 2013-06-09 | 2018-09-04 | Huawei Technologies Co., Ltd. | Method for configuring resource to data radio bearer DRB, and apparatus |
US10219182B1 (en) | 2017-09-10 | 2019-02-26 | Hewlett Packard Enterprise Development Lp | Channel bandwidth selection |
Families Citing this family (54)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI20055211A0 (en) | 2005-05-06 | 2005-05-06 | Nokia Corp | Radio resource management in FDMA |
WO2007024096A2 (en) * | 2005-08-24 | 2007-03-01 | Electronics And Telecommunications Research Institute | Communication resource allocation method of base station |
EP1786228A1 (en) * | 2005-11-10 | 2007-05-16 | Alcatel Lucent | Method and apparatus for uplink resource allocation in a cellular communication system |
US7941135B2 (en) * | 2006-03-22 | 2011-05-10 | Alcatel-Lucent Usa Inc. | Methods of performing live monitoring of a wireless communication network |
US9313064B2 (en) | 2006-04-18 | 2016-04-12 | Interdigital Technology Corporation | Method and apparatus for synchronization in an OFDMA evolved UTRA wireless communication system |
EP1853079B1 (en) * | 2006-05-03 | 2013-01-09 | Nokia Siemens Networks GmbH & Co. KG | Radio resource administration in a mobile radio communications network |
US7664467B2 (en) * | 2006-06-19 | 2010-02-16 | Alcatel-Lucent Usa Inc. | Method for coordinated control of radio resources for multicasting in a distributed wireless system |
WO2008003815A1 (en) * | 2006-07-07 | 2008-01-10 | Nokia Corporation | Improved radio resource allocation mechanism |
JP4913502B2 (en) * | 2006-08-16 | 2012-04-11 | 株式会社エヌ・ティ・ティ・ドコモ | Communication control method, radio base station, and radio control station |
KR100753369B1 (en) * | 2006-08-30 | 2007-08-30 | 주식회사 팬택 | Method of inter-cell interference mitigation for a mobile communication system |
KR100765892B1 (en) | 2006-08-30 | 2007-10-10 | 주식회사 팬택 | Method of controlling inter-cell interference for a mobile communication system |
JP4905007B2 (en) * | 2006-09-12 | 2012-03-28 | 富士通株式会社 | Uplink communication method and radio terminal in radio communication system |
JP4932432B2 (en) * | 2006-11-01 | 2012-05-16 | 株式会社エヌ・ティ・ティ・ドコモ | Base stations used in mobile communication systems |
FI20065698A0 (en) * | 2006-11-06 | 2006-11-06 | Nokia Corp | Allocation of radio resources and radio system |
CN101242632B (en) * | 2007-02-06 | 2011-11-16 | 华为技术有限公司 | A method and base station device for allocating dedicated channel |
ATE501611T1 (en) * | 2007-02-09 | 2011-03-15 | Ericsson Telefon Ab L M | METHOD AND DEVICE FOR ASSOCIATING A LOT OF CELLS IN A RADIO NETWORK |
WO2008111749A1 (en) * | 2007-03-09 | 2008-09-18 | Electronics And Telecommunications Research Institute | Method for allocating radio resources |
US8130780B2 (en) * | 2007-06-15 | 2012-03-06 | Futurewei Technologies, Inc. | Method and apparatus for assigning resources in a wireless system with multiple regions |
CN101772972B (en) * | 2007-08-06 | 2013-07-24 | Lm爱立信电话有限公司 | OFDMA uplink interference impact recovery in LTE system |
US8867455B2 (en) * | 2007-10-01 | 2014-10-21 | Qualcomm Incorporated | Enhanced uplink for inactive state in a wireless communication system |
CN101409921B (en) * | 2007-10-10 | 2011-08-10 | 北京信威通信技术股份有限公司 | Method for united distribution of channel and signal transmission parameter in radio communication system |
US8259601B2 (en) | 2007-10-16 | 2012-09-04 | Mediatek Inc. | Interference measurement mechanism for frequency reuse in cellular OFDMA systems |
CN102783165B (en) * | 2007-10-16 | 2016-02-24 | 联发科技股份有限公司 | The interferometry mechanism that cellular orthogonal frequency division multiple access system medium frequency is multiplexing |
CN101828414B (en) * | 2007-11-27 | 2013-12-18 | 中兴通讯股份有限公司 | Downlink transmission system of borrowing frequency spectrum and channel resource of adjacent cells and method and terminal thereof |
US9668265B2 (en) | 2008-03-28 | 2017-05-30 | Qualcomm Inc. | Technique for mitigating interference in a celllar wireless communication netwok |
US8594576B2 (en) | 2008-03-28 | 2013-11-26 | Qualcomm Incorporated | Short-term interference mitigation in an asynchronous wireless network |
WO2009122776A1 (en) * | 2008-04-02 | 2009-10-08 | 日本電気株式会社 | Control device, communication system, resource allocation method, and recording medium containing the program |
US8761824B2 (en) | 2008-06-27 | 2014-06-24 | Qualcomm Incorporated | Multi-carrier operation in a wireless communication network |
CN101626585B (en) * | 2008-07-10 | 2013-04-24 | 日电(中国)有限公司 | Network interference evaluation method, dynamic channel distribution method and equipment in wireless network |
US9226300B2 (en) * | 2008-07-11 | 2015-12-29 | Qualcomm Incorporated | Hierarchical control channel structure for wireless communication |
US8611822B2 (en) * | 2008-07-15 | 2013-12-17 | Qualcomm Incorporated | Wireless communication systems with femto cells |
JP5309765B2 (en) | 2008-07-29 | 2013-10-09 | 富士通株式会社 | Information access system, information storage device, and read / write device |
US8233428B2 (en) * | 2008-08-13 | 2012-07-31 | Telefonaktiebolaget Lm Ericsson (Publ) | Using a synchronization channel to send quick paging signals |
US8315217B2 (en) * | 2008-09-23 | 2012-11-20 | Qualcomm Incorporated | Method and apparatus for controlling UE emission in a wireless communication system |
KR101170875B1 (en) * | 2008-12-19 | 2012-08-02 | 한국전자통신연구원 | Mehtod and apparatus for evaluating the modification of the licence for the spectrum liberalization |
US8135436B2 (en) | 2009-03-13 | 2012-03-13 | Intel Mobile Communications GmbH | Mobile radio communication devices and methods for controlling a mobile radio communication device |
JP5939611B2 (en) * | 2009-12-24 | 2016-06-22 | 日本電気株式会社 | BASE STATION, COMMUNICATION TERMINAL, RADIO RESOURCE SETTING METHOD, AND BASE STATION CONTROL PROGRAM |
KR101702126B1 (en) * | 2010-02-09 | 2017-02-03 | 삼성전자주식회사 | A method and apparatus for transmitting/receiving inter-cell interference information in a communication system |
US8472390B2 (en) * | 2010-02-23 | 2013-06-25 | Motorola Solutions, Inc. | Method and apparatus for allocating spectrum |
WO2012037643A1 (en) * | 2010-09-13 | 2012-03-29 | Blinq Wireless Inc. | System and method for co-channel interference measurement and managed adaptive resource allocation for wireless backhaul |
US9338672B2 (en) | 2010-09-13 | 2016-05-10 | Blinq Wireless Inc. | System and method for coordinating hub-beam selection in fixed wireless backhaul networks |
US9338753B2 (en) | 2011-05-06 | 2016-05-10 | Blinq Wireless Inc. | Method and apparatus for performance management in wireless backhaul networks via power control |
CN102802161A (en) * | 2011-05-27 | 2012-11-28 | 国际商业机器公司 | Method and equipment for reducing spectrum interferences among wireless networks |
CN103891382B (en) | 2011-10-20 | 2018-08-10 | 瑞典爱立信有限公司 | The method and arrangement of distribution for radio resource |
US9237529B2 (en) | 2012-03-30 | 2016-01-12 | Blinq Wireless Inc. | Method and apparatus for managing interference in wireless backhaul networks through power control with a one-power-zone constraint |
US9252908B1 (en) | 2012-04-12 | 2016-02-02 | Tarana Wireless, Inc. | Non-line of sight wireless communication system and method |
US9325409B1 (en) | 2012-04-12 | 2016-04-26 | Tarana Wireless, Inc. | Non-line of sight wireless communication system and method |
US9735940B1 (en) | 2012-04-12 | 2017-08-15 | Tarana Wireless, Inc. | System architecture for optimizing the capacity of adaptive array systems |
US9456354B2 (en) | 2012-04-12 | 2016-09-27 | Tarana Wireless, Inc. | Non-line of sight wireless communication system and method |
US9253740B2 (en) | 2012-11-29 | 2016-02-02 | Blinq Wireless Inc. | Method and apparatus for coordinated power-zone-assignment in wireless backhaul networks |
US10110270B2 (en) | 2013-03-14 | 2018-10-23 | Tarana Wireless, Inc. | Precision array processing using semi-coherent transceivers |
US10499456B1 (en) | 2013-03-15 | 2019-12-03 | Tarana Wireless, Inc. | Distributed capacity base station architecture for broadband access with enhanced in-band GPS co-existence |
US10348394B1 (en) | 2014-03-14 | 2019-07-09 | Tarana Wireless, Inc. | System architecture and method for enhancing wireless networks with mini-satellites and pseudollites and adaptive antenna processing |
JP2017529720A (en) * | 2014-07-14 | 2017-10-05 | アイポジ インコーポレイテッドIposi,Inc. | Tomographic loss factor estimation |
Citations (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5519884A (en) * | 1992-11-02 | 1996-05-21 | U.S. Philips Corporation | Cellular mobile radio system utilizing predetermined channel lists |
US5722043A (en) * | 1993-02-05 | 1998-02-24 | The Research Foundation Of State University Of New York | Method and apparatus of assigning and sharing channels in a cellular communication system |
US5758090A (en) * | 1995-09-22 | 1998-05-26 | Airnet Communications, Inc. | Frequency reuse planning for CDMA cellular communication system by grouping of available carrier frequencies and power control based on the distance from base station |
US5854981A (en) * | 1995-08-08 | 1998-12-29 | Telefonaktiebolaget L M Ericsson | Adaptive neighbor cell list |
US5867478A (en) * | 1997-06-20 | 1999-02-02 | Motorola, Inc. | Synchronous coherent orthogonal frequency division multiplexing system, method, software and device |
US6055427A (en) * | 1996-07-18 | 2000-04-25 | Nokia Telecommunications Oy | Hard handoff and a radio system |
US6154655A (en) * | 1998-03-05 | 2000-11-28 | Lucent Technologies Inc. | Flexible channel allocation for a cellular system based on a hybrid measurement-based dynamic channel assignment and a reuse-distance criterion algorithm |
US6339708B1 (en) * | 1997-05-22 | 2002-01-15 | At&T Corp. | Method and apparatus for communications resource allocation for a wireless communications system |
US20020145988A1 (en) * | 2001-04-04 | 2002-10-10 | Erik Dahlman | Cellular radio communication system with frequency reuse |
US6498934B1 (en) * | 1999-03-24 | 2002-12-24 | Telefonaktiebologet Lm Ericsson (Publ) | Channel allocation using enhanced pathloss estimates |
US20030013451A1 (en) * | 2001-05-03 | 2003-01-16 | Walton Jay R. | Method and apparatus for controlling uplink transmissions of a wireless communication system |
US6522888B1 (en) * | 1999-08-31 | 2003-02-18 | Lucent Technologies Inc. | System for determining wireless coverage using location information for a wireless unit |
US6549782B2 (en) * | 1999-03-31 | 2003-04-15 | Siemens Information And Communication Networks, Inc. | Radio communications systems |
US6636736B1 (en) * | 1997-09-12 | 2003-10-21 | Nortel Networks Limited | Device for allocating resources in a radiocommunication network |
US20040018843A1 (en) * | 1999-02-22 | 2004-01-29 | Telefonaktiebolaget Lm Ericsson | Mobile radio system and a method for channel allocation in a mobile radio system |
US6895244B2 (en) * | 2000-12-29 | 2005-05-17 | Bellsouth Intellectual Property Corporation | Method for automated update of telecommunications data in a wireless network |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03295324A (en) * | 1990-04-13 | 1991-12-26 | Nippon Telegr & Teleph Corp <Ntt> | Channel assignment control system in mobile communication |
JP2679413B2 (en) | 1990-12-20 | 1997-11-19 | 日本電気株式会社 | Channel allocation method for mobile communication system |
GB2313742A (en) | 1996-05-28 | 1997-12-03 | Motorola Inc | Channel allocation in a cellular communication system |
KR100929094B1 (en) * | 2003-09-20 | 2009-11-30 | 삼성전자주식회사 | System and method for dynamic resource allocation in a communication system using orthogonal frequency division multiple access scheme |
-
2004
- 2004-04-19 EP EP04101597A patent/EP1589776A1/en not_active Withdrawn
-
2005
- 2005-03-29 EP EP05717153A patent/EP1741307B1/en active Active
- 2005-03-29 PL PL05717153T patent/PL1741307T3/en unknown
- 2005-03-29 CN CN2005800115945A patent/CN1943263B/en active Active
- 2005-03-29 CA CA2559448A patent/CA2559448C/en not_active Expired - Fee Related
- 2005-03-29 AU AU2005234534A patent/AU2005234534B2/en not_active Ceased
- 2005-03-29 AT AT05717153T patent/ATE410898T1/en not_active IP Right Cessation
- 2005-03-29 JP JP2007507792A patent/JP4695135B2/en active Active
- 2005-03-29 TW TW094109798A patent/TWI388226B/en not_active IP Right Cessation
- 2005-03-29 KR KR1020067021603A patent/KR100891848B1/en active IP Right Grant
- 2005-03-29 WO PCT/EP2005/051408 patent/WO2005101882A1/en active Application Filing
- 2005-03-29 US US11/578,515 patent/US7912475B2/en active Active
- 2005-03-29 DE DE602005010233T patent/DE602005010233D1/de active Active
- 2005-03-29 RU RU2006140807/09A patent/RU2378762C2/en active
-
2007
- 2007-09-20 HK HK07110247.3A patent/HK1105063A1/en not_active IP Right Cessation
-
2011
- 2011-02-14 US US13/026,724 patent/US20110136496A1/en not_active Abandoned
Patent Citations (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5519884A (en) * | 1992-11-02 | 1996-05-21 | U.S. Philips Corporation | Cellular mobile radio system utilizing predetermined channel lists |
US5722043A (en) * | 1993-02-05 | 1998-02-24 | The Research Foundation Of State University Of New York | Method and apparatus of assigning and sharing channels in a cellular communication system |
US5854981A (en) * | 1995-08-08 | 1998-12-29 | Telefonaktiebolaget L M Ericsson | Adaptive neighbor cell list |
US5758090A (en) * | 1995-09-22 | 1998-05-26 | Airnet Communications, Inc. | Frequency reuse planning for CDMA cellular communication system by grouping of available carrier frequencies and power control based on the distance from base station |
US6055427A (en) * | 1996-07-18 | 2000-04-25 | Nokia Telecommunications Oy | Hard handoff and a radio system |
US6339708B1 (en) * | 1997-05-22 | 2002-01-15 | At&T Corp. | Method and apparatus for communications resource allocation for a wireless communications system |
US5867478A (en) * | 1997-06-20 | 1999-02-02 | Motorola, Inc. | Synchronous coherent orthogonal frequency division multiplexing system, method, software and device |
US6636736B1 (en) * | 1997-09-12 | 2003-10-21 | Nortel Networks Limited | Device for allocating resources in a radiocommunication network |
US6154655A (en) * | 1998-03-05 | 2000-11-28 | Lucent Technologies Inc. | Flexible channel allocation for a cellular system based on a hybrid measurement-based dynamic channel assignment and a reuse-distance criterion algorithm |
US20040018843A1 (en) * | 1999-02-22 | 2004-01-29 | Telefonaktiebolaget Lm Ericsson | Mobile radio system and a method for channel allocation in a mobile radio system |
US6498934B1 (en) * | 1999-03-24 | 2002-12-24 | Telefonaktiebologet Lm Ericsson (Publ) | Channel allocation using enhanced pathloss estimates |
US6549782B2 (en) * | 1999-03-31 | 2003-04-15 | Siemens Information And Communication Networks, Inc. | Radio communications systems |
US6522888B1 (en) * | 1999-08-31 | 2003-02-18 | Lucent Technologies Inc. | System for determining wireless coverage using location information for a wireless unit |
US6895244B2 (en) * | 2000-12-29 | 2005-05-17 | Bellsouth Intellectual Property Corporation | Method for automated update of telecommunications data in a wireless network |
US20020145988A1 (en) * | 2001-04-04 | 2002-10-10 | Erik Dahlman | Cellular radio communication system with frequency reuse |
US20030013451A1 (en) * | 2001-05-03 | 2003-01-16 | Walton Jay R. | Method and apparatus for controlling uplink transmissions of a wireless communication system |
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8966456B2 (en) | 2006-03-24 | 2015-02-24 | The Mathworks, Inc. | System and method for providing and using meta-data in a dynamically typed array-based language |
US20070288892A1 (en) * | 2006-03-24 | 2007-12-13 | The Mathworks, Inc. | System and method for providing and using meta-data in a dynamically typed array-based language |
US9395963B1 (en) | 2006-07-17 | 2016-07-19 | The Mathworks, Inc. | System and method for accessing meta-data in a dynamically typed array-based language |
US9097784B2 (en) | 2007-02-05 | 2015-08-04 | Commscope Technologies Llc | System and method to collect and modify calibration data |
US20100304753A1 (en) * | 2007-12-03 | 2010-12-02 | Fujitsu Limited | Uplink Transmit Power Control Method, Communication Terminal Unit, Base Station Unit, And Mobile Communication System |
US8229447B2 (en) * | 2007-12-03 | 2012-07-24 | Fujitsu Limited | Uplink transmit power control method, communication terminal unit, base station unit, and mobile communication system |
US20110134876A1 (en) * | 2008-08-12 | 2011-06-09 | Hitachi, Ltd. | Wireless Communication System, Wireless Communication Device, and Wireless Resource Management Method |
US20100151876A1 (en) * | 2008-12-12 | 2010-06-17 | Electronics And Telecommunications Research Institute | Apparatus and method for controlling inter-cell interference |
US8582513B2 (en) * | 2008-12-12 | 2013-11-12 | Electronics And Telecommunications Research Institute | Apparatus and method for controlling inter-cell interference |
US20100254344A1 (en) * | 2009-04-07 | 2010-10-07 | Mediatek Inc And National Taiwan University | Mechanism of dynamic resource transaction for wireless OFDMA systems |
US8717983B2 (en) | 2009-04-07 | 2014-05-06 | National Taiwan University MediaTek Inc. | Mechanism of dynamic resource transaction for wireless OFDMA systems |
US20120034865A1 (en) * | 2009-05-19 | 2012-02-09 | Fujitsu Limited | Base station, relay station, communication system, and communication method |
US20110286346A1 (en) * | 2010-04-13 | 2011-11-24 | Qualcomm Incorporated | Measurement of received power and received quality in a wireless communication network |
US9609536B2 (en) * | 2010-04-13 | 2017-03-28 | Qualcomm Incorporated | Measurement of received power and received quality in a wireless communication network |
US20150105102A1 (en) * | 2011-02-14 | 2015-04-16 | Andrew Llc | System and Method for Mobile Location by Dynamic Clustering |
US8938259B2 (en) * | 2011-02-14 | 2015-01-20 | Andrew, Llc | System and method for mobile location by dynamic clustering |
US9173060B2 (en) * | 2011-02-14 | 2015-10-27 | CommScope Technologies LLP | System and method for mobile location by dynamic clustering |
US20140004881A1 (en) * | 2011-02-14 | 2014-01-02 | Andrew Llc | System and Method for Mobile Location By Dynamic Clustering |
US10070430B2 (en) | 2013-06-09 | 2018-09-04 | Huawei Technologies Co., Ltd. | Method for configuring resource to data radio bearer DRB, and apparatus |
US10219182B1 (en) | 2017-09-10 | 2019-02-26 | Hewlett Packard Enterprise Development Lp | Channel bandwidth selection |
Also Published As
Publication number | Publication date |
---|---|
US20070249361A1 (en) | 2007-10-25 |
RU2006140807A (en) | 2008-05-27 |
EP1741307B1 (en) | 2008-10-08 |
EP1589776A1 (en) | 2005-10-26 |
CA2559448C (en) | 2013-12-17 |
CN1943263B (en) | 2012-05-09 |
JP2007533224A (en) | 2007-11-15 |
PL1741307T3 (en) | 2009-04-30 |
KR20060133032A (en) | 2006-12-22 |
WO2005101882A1 (en) | 2005-10-27 |
JP4695135B2 (en) | 2011-06-08 |
TW200621056A (en) | 2006-06-16 |
RU2378762C2 (en) | 2010-01-10 |
EP1741307A1 (en) | 2007-01-10 |
AU2005234534A1 (en) | 2005-10-27 |
AU2005234534B2 (en) | 2009-06-25 |
KR100891848B1 (en) | 2009-04-07 |
CA2559448A1 (en) | 2005-10-27 |
HK1105063A1 (en) | 2008-02-01 |
CN1943263A (en) | 2007-04-04 |
TWI388226B (en) | 2013-03-01 |
ATE410898T1 (en) | 2008-10-15 |
US7912475B2 (en) | 2011-03-22 |
DE602005010233D1 (en) | 2008-11-20 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7912475B2 (en) | Dynamic allocation of radio resources | |
EP3094123B1 (en) | Measurement-assisted dynamic frequency-reuse in cellular telecommuncations networks | |
TWI415405B (en) | Token based radio resource management | |
Mao et al. | Adaptive soft frequency reuse for inter-cell interference coordination in SC-FDMA based 3GPP LTE uplinks | |
EP2453711B1 (en) | Method for assigning frequency subbands to a plurality of interfering nodes in a wireless communication network, controller for a wireless communication network and wireless communication network | |
EP2223451B1 (en) | Scrambling code allocation in a cellular communication network | |
US7634277B2 (en) | Method for allocating channel resources for improving frequency utilization efficiency of wireless communication systems | |
US9451486B2 (en) | Performing measurements in a digital cellular wireless telecommunication network | |
WO2008003815A1 (en) | Improved radio resource allocation mechanism | |
EP1931089B1 (en) | Radio communication apparatus and radio communication method | |
KR20100038558A (en) | Apparatus and method for controlling interference in hierarchical cell structure wireless communication system | |
KR101880972B1 (en) | Apparatus and method for multi-tier clustering in wireless communication systems | |
KR101651407B1 (en) | Method and apparatus for reuse of adaptive partial frequency in a cellular mobile communication system | |
Mehta et al. | A self-organized resource allocation using inter-cell interference coordination (ICIC) in relay-assisted cellular networks | |
EP2768266A1 (en) | Interference coordination in HetNet | |
KR101078478B1 (en) | Method for allocating reverse link resourse in based macro-diversity for cellular ofdma system | |
Lee et al. | Dynamic channel allocation using the interference range in multi-cell downlink systems | |
Zhioua et al. | A femtocells ressources allocation scheme in ofdma based networks | |
WO2023212313A1 (en) | Partial frequency time resource reuse coordination for interference mitigation in frequency reuse radio networks | |
Gordejuela-Sanchez et al. | Planning and optimization of multihop relaying networks | |
Kim et al. | Dynamic Frequency Reuse OFDMA Downlink Scheduling by Random Access Scheme |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |