US20050254458A1 - Wireless subscriber network registration system for configurable services - Google Patents
Wireless subscriber network registration system for configurable services Download PDFInfo
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- US20050254458A1 US20050254458A1 US11/187,141 US18714105A US2005254458A1 US 20050254458 A1 US20050254458 A1 US 20050254458A1 US 18714105 A US18714105 A US 18714105A US 2005254458 A1 US2005254458 A1 US 2005254458A1
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- device capabilities
- wireless
- transmission
- transmission constraints
- base station
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/18—Negotiating wireless communication parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/12—Discovery or management of network topologies
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
- H04W52/42—TPC being performed in particular situations in systems with time, space, frequency or polarisation diversity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
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- 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
- H04W16/14—Spectrum sharing arrangements between different networks
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- 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
- H04W16/24—Cell structures
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
Definitions
- wireless transmissions are carried via an RF medium between users and a central wireless transceiver, or base station processor.
- a subscriber access unit connected to a user device such as a user PC is employed to transmit wireless messages to and from the base station processor.
- wireless transmission resources are typically allocated among many subscriber access units to serve many users. Therefore, many subscriber access units are transmitting to and receiving from a common base station processor via the RF medium.
- CDMA Code Division Multiple Access
- power control are often employed to mitigate such interference.
- factors such as distance and the mobility of the user can limit the degree to which the interference may be mitigated.
- certain device capabilities for example the type of antenna employed, can affect interference.
- Directional antennas which can focus a transmitted signal among several degrees of freedom to correspond to the base station processor, are less prone to interference than omnidirectional antennas, which transmit with equal strength in all directions.
- subscriber access units employing an omnidirectional antenna or which are highly mobile will tend to experience more interference than stationary users or subscriber access units employing a directional antenna.
- the result may be a disproportionate amount of wireless resources being allocated to a subscriber access unit which is prone to interference, sometimes called a lossy link.
- the allocation of wireless transmission resources to retransmit wireless messages over a lossy link can have a detrimental effect on wireless resources available for other users. Accordingly, it would be beneficial to provide a system and method for a subscriber access unit to register device capabilities with a base station processor to determine the degree to which a particular subscriber access unit may be prone to interference, and adjust transmission constraints for that subscriber access unit accordingly.
- a method for managing transmission constraints based on subscriber device capabilities allows transmission constraints to be set for each user to maximize throughput in the wireless telecommunications network.
- a set of device capabilities corresponding to a local transceiver device or subscriber access unit connected to the user in the wireless telecommunications network is determined.
- the device capabilities are registered with a remote wireless transceiver device such as a base station processor, which is in wireless communication with the local transceiver device.
- a set of transmission constraints is computed based on the device capabilities, and the transmission constraints corresponding to the transceiver device are applied to the wireless transmissions between the transceiver device and the remote transceiver device.
- the wireless transceiver device is typically a subscriber access unit connected to a user device such as a user PC, and the remote transceiver device is a base station processor which is also in wireless communication with other subscriber access units.
- the device capabilities include antenna characteristics, and whether the user mobility is fixed, mobile, or a pedestrian.
- the subscriber access unit transmits the device capabilities to the base station processor.
- the base station processor can receive the device capabilities from a central repository such as a wireless Internet facility (WIF), based on an index such as a subscriber ID or electronic serial number (ESN) which is indicative of the subscriber access unit.
- WIF wireless Internet facility
- ESN electronic serial number
- the base station processor receives and stores, or registers, the device capabilities, and computes a set of transmission constraints based upon the ability of the subscriber access unit to receive wireless transmissions.
- the transmission constraints are computed on an expected likelihood of interference and dropped packets, and include parameters such as transmission power, forward error correction (FEC) coding rate, and modulation.
- FEC forward error correction
- the transmission constraints are computed such that a subscriber access unit which is more prone to interference and lost packets does not consume a disproportionate share of wireless transmission resources.
- a subscriber access unit that is nearby, stationary, and transmitting with a directional antenna is likely to experience little interference and is more likely of sustaining a relatively high transmission throughput rate.
- the base station processor may allocate more wireless transmission resources, such as wireless channels, to such a user.
- a user that is distant, mobile, and transmitting with an omnidirectional antenna is likely to experience more interference and lost packets.
- the transmission constraints computed by the base station processor may include increasing the error correction rate and limiting the overall transmission rate so that the base station processor does not allocate excessive resources in order to maintain a high data rate over a lossy link.
- FIG. 1 shows a wireless communication system suitable for performing wireless transmission according to the present invention
- FIG. 2 shows wireless omnidirectional and directional antennas in a cell
- FIG. 3 a shows an access unit registration table
- FIG. 3 b shows a transmission constraint table
- FIGS. 4 a - 4 c show an example of registration and transmission according to the invention as defined by the present claims.
- FIG. 5 shows a flowchart of subscriber access unit registration.
- FIG. 1 shows a wireless communication system suitable for performing wireless subscriber registration according to the invention as defined by the present claims.
- a user PC 12 or other access point into a user computer system or local area network is in communication with a subscriber access unit 14 via a wired connection 20 .
- the wired connection 20 may be any suitable wired medium such as TCP/IP, Ethernet, or direct connection.
- the subscriber access unit 14 is in communication with a wireless transceiver, such as the base station processor 16 , via a wireless link 24 , and is operable to transmit wireless messages in an RF medium between the subscriber access unit 14 and the base station processor 16 .
- the base station processor 16 is connected to the Internet 18 or other public access network via the Internet connection 22 .
- the Internet connection 22 may also be any suitable wired line connection, such as TCP/IP, UDP/IP, Ethernet, Ti line, POTS (plain old telephone system) or other wired medium.
- An end user at the user PC 12 may therefore receive data from the Internet 18 via the wired connections 20 , 22 and wireless link 24 supported by the base station processor 16 and the subscriber access unit 14 .
- FIG. 2 shows wireless omnidirectional and directional antennas in a cell.
- the cell is provided wireless services by the base station processor 16 .
- Subscriber access units 14 a and 14 b are also located in the cell. In a typical cell, there are many subscriber access units, 14 n generally, in communication with the base station processor 16 .
- the subscriber access unit 14 a is connected to an omnidirectional antenna 22
- the subscriber access unit 14 b is connected to a directional antenna 26 .
- the base station processor 16 is also connected to an antenna 28 , and transmits and receives wireless signals 30 to and from the subscriber access units 14 a and 14 b via the antennas 22 , 26 and 28 .
- Each of the subscriber access units 14 a , 14 b has device capabilities which are indicative of the particular subscriber access unit.
- the device capabilities are indicative of the antenna type that a particular subscriber access unit employs, and the mobility, such as whether the subscriber access unit is fixed, mobile, or pedestrian.
- the omnidirectional antenna 22 transmits a signal of equal strength in all directions by employing a single radiating element 32 .
- the directional antenna 26 transmits a focused signal which is stronger in a particular direction via an antenna array 36 having multiple radiating elements 34 a - 34 e in the example shown.
- Various numbers and arrangements of radiating elements are configurable in an antenna array depending on the transmission characteristics sought.
- the directional antenna has four radiating elements which form a square around a central fifth radiating element.
- an omnidirectional antenna 22 it may be beneficial to reduce the power level employed, so as to minimize interference with signals between other subscriber access units 14 n .
- error correction such as the forward error correction (FEC) coding rate to reduce the number of lost packets, or to reduce the data throughput rate so that disproportionate wireless transmission resources are not expended.
- FEC forward error correction
- a directional antenna 26 it may be beneficial to increase the power level because the signals may be steered towards the antenna 28 connected to the base station processor. Further, a reduction in the FEC rate or an increase in data throughput rate may be performed if the link can effectively maintain a low rate of lost packets at a set of new transmission constraint settings.
- Other transmission constraints discussed further below, are possible.
- the transmission constraints may be adjusted in response to observed transmission characteristics over the wireless link.
- the transmission characteristics which may be observed include bit error rate (BER), interference level, dropped packets, and received power level. Other characteristics may also be employed.
- BER bit error rate
- interference level interference level
- dropped packets dropped packets
- received power level received power level. Other characteristics may also be employed.
- BER bit error rate
- Other characteristics may also be employed.
- a likelihood of a particular transmission succeeding can be determined. The likelihood is employed in computing transmission constraints for the subscriber access unit 14 n.
- the device capabilities of the particular subscriber access unit 14 n are received by the corresponding base station processor 16 .
- the device capabilities may be sent by the subscriber access unit 14 n itself, or may be sent from a wireless internet facility (WIF) based on a unique identifier such as an electronic serial number (ESN) or subscriber ID.
- WIF wireless internet facility
- ESN electronic serial number
- subscriber ID a unique identifier such as an electronic serial number (ESN) or subscriber ID.
- ESN electronic serial number
- subscriber ID subscriber ID
- FIG. 3 a shows an access unit registration table
- FIG. 3 b shows a transmission constraint table
- the access unit registration table 38 stores a subscriber profile having parameters 40 indicative of subscriber device capabilities.
- the table 38 stores subscriber profile entries 42 corresponding to each subscriber access unit 14 n ( FIG. 2 ).
- the subscriber profile entries list, for each subscriber, a subscriber ID 39 a , which uniquely identifies the subscriber, a subscriber type 39 b , which identifies the mobility of the user, an antenna type 39 c , identifying the type of antenna employed by the subscriber access unit, and a transmission profile ID 39 d , which is an index into the transmission constraint table 44 ( FIG. 3 b ).
- the transmission constraint table 44 stores transmission profile entries 48 indicative of the transmission constraints 46 which should be applied to each subscriber access unit 14 .
- the transmission constraints 46 include power level 54 b , indicative of the power, in dBm units, which should be employed for the corresponding subscriber, an FEC rate 54 c , typically 1 ⁇ 2, 1 ⁇ 3, 1 ⁇ 4, or 4 ⁇ 5, and a modulation type 54 d , such as Binary Phase Shift Keyed (BPSK), Quadrature Phase Shift Keyed (QPSK), 16 bit Quadrature Amplitude Modulation (QAM 16), or QAM 64.
- BPSK Binary Phase Shift Keyed
- QPSK Quadrature Phase Shift Keyed
- QAM 16 Quadrature Amplitude Modulation
- a transmission profile identifier 54 a is mapped from the transmission profile identifier 39 d in the access unit registration table 38 , and identifies which transmission constraints 54 b , 54 c , and 54 d should be imposed on a particular subscriber access unit.
- the subscriber access unit corresponding to subscriber profile entry 50 a maps to transmission profile entry 52 a
- entry 50 b maps to 52 b , as shown by the transmission profile indices P 1 and P 2 .
- FIGS. 4 a - 4 c show an example of registration and transmission.
- two subscriber access units 14 a and 14 b are located in a cell served by the base station processor 16 .
- Subscriber profile entry 56 corresponds to subscriber 14 a
- subscriber profile entry 58 corresponds to subscriber 14 b , both stored in a registration database 70 connected to the base station processor 16 .
- subscriber 14 a is a mobile user with an omnidirectional antenna, and corresponds to transmission profile entry 60 in the transmission constraint table 44 ′.
- a registration manager 72 in the base station processor 16 computes transmission constraints, and stores them in the transmission profile entry 60 .
- a capacity manager 74 in the base station processor then applies the transmission constraints to transmissions between the subscriber access unit 14 a and the base station processor 16 , as shown by arrow 76 .
- subscriber 14 a is allocated only a power level of 23 dBm, so as to minimize interference with adjacent cells, has an FEC rate of ⁇ 2 because it is likely that robust error correction will be needed, QPSK modulation is to be employed, and the maximum data rate allowed will be 0.050 mbps, so that subscriber access unit 14 a will not be allocated an excessive number of wireless channels which could otherwise be allocated to more capable users.
- Subscriber access unit 14 b is a fixed user with a directional antenna having four degrees of freedom, as shown by subscriber profile entry 58 , stored in the registration database 70 . Accordingly, subscriber access unit 14 b has a higher capacity than subscriber access unit 14 a . Therefore, the transmission constraints imposed on subscriber 14 b are less restrictive to allow higher throughput, shown by arrow 78 .
- constraints are computed by the registration manager 72 and are stored in transmission profile entry 62 , including a power level of 33 dBm, since the subscriber access unit is employing a directional antenna, a faster but less robust FEC rate of 4 ⁇ 5, because less error correction is likely to be needed, a faster QAM 64 modulation, and a data rate of 0.366 mbps, which will result in more wireless channels being allocated to this device by the capacity manager 74 due to increased capacity for wireless traffic.
- FIG. 5 shows a flowchart of subscriber access unit registration.
- a subscriber access unit is activated by moving into a cell or being turned on in the cell, as depicted at step 100 .
- An initial transmission occurs in which the ESN and the subscriber ID are sent to the base station processor, as shown at step 102 .
- a check is performed to determine if the device characteristics are stored at the subscriber access unit, as shown at step 103 . If the device characteristics are stored at the subscriber access unit, they are sent to the base station processor, as disclosed at step 104 . Otherwise, the WIF sends the device characteristics to the base station processor based on the ESN or the subscriber ID, as depicted at step 106 .
- the a subscriber profile entry containing the device characteristics are stored in the access unit registration table, as shown at step 108 .
- a set of transmission constraints is computed, as disclosed at step 110 .
- a transmission profile entry is created and mapped to the subscriber profile entry to store the transmission constraints for this subscriber access unit, as shown at step 112 .
- the transmission constraints are then employed in wireless transmission between the subscriber access unit and the base station processor, as depicted at step 114 , until a triggering event occurs.
- a triggering event is indicative of a need to recompute the transmission constraints and update the transmission profile entry.
- Such a triggering event may include expiration of a predetermined update interval, or a threshold event such as change in the number of subscriber access units supported.
- the programs defining the subscriber device registration operations and methods defined herein are deliverable to a subscriber access unit and to a base station processor in many forms, including but not limited to a) information permanently stored on non-writeable storage media such as ROM devices, b) information alterably stored on writeable storage media such as floppy disks, magnetic tapes, CDs, RAM devices, and other magnetic and optical media, or c) information conveyed to a computer through communication media, for example using baseband signaling or broadband signaling techniques, as in an electronic network such as the Internet or telephone modem lines.
- the operations and methods may be implemented in a software executable by a processor or as a set of instructions embedded in a carrier wave. Alternatively, the operations and methods may be embodied in whole or in part using hardware components, such as Application Specific Integrated Circuits (ASICs), state machines, controllers or other hardware components or devices, or a combination of hardware, software, and firmware components.
- ASICs Application Specific Integrated Circuits
Abstract
In a wireless telecommunications network, wireless transmissions are carried via an RF medium between users and a central wireless transceiver, or base station processor. A subscriber access unit connected to a user device such as a user PC is employed to transmit wireless messages to and from the base station processor. Multiple, simultaneous wireless transmissions to the base station from different subscriber access units can have a tendency to interfere with each other. Subscriber access units employing an omnidirectional antenna r which are highly mobile will tend to experience more interference than stationary users or subscriber access units employing a directional antenna. The allocation of wireless transmission resources to retransmit wireless messages over a lossy link can have a detrimental effect on wireless resources available for other users. A system which allows a subscriber access unit to register device capabilities with a base station processor to determine the degree to which a particular subscriber access unit may be prone to interference provides computation and adjustment of transmission constraints for each subscriber access unit accordingly to maximize throughput.
Description
- This application is a continuation of U.S. application Ser. No. 09/841,695, filed Apr. 24, 2001, the entire teachings of which are herein incorporated by reference.
- In a wireless telecommunications network, wireless transmissions are carried via an RF medium between users and a central wireless transceiver, or base station processor. A subscriber access unit connected to a user device such as a user PC is employed to transmit wireless messages to and from the base station processor. In a wireless network, wireless transmission resources are typically allocated among many subscriber access units to serve many users. Therefore, many subscriber access units are transmitting to and receiving from a common base station processor via the RF medium.
- Multiple, simultaneous RF transmissions to the base station from different subscriber access units can have a tendency to interfere with each other. Techniques including Code Division Multiple Access (CDMA) and power control are often employed to mitigate such interference. However, factors such as distance and the mobility of the user can limit the degree to which the interference may be mitigated. Further, certain device capabilities, for example the type of antenna employed, can affect interference. Directional antennas, which can focus a transmitted signal among several degrees of freedom to correspond to the base station processor, are less prone to interference than omnidirectional antennas, which transmit with equal strength in all directions.
- Therefore, subscriber access units employing an omnidirectional antenna or which are highly mobile will tend to experience more interference than stationary users or subscriber access units employing a directional antenna. However, since interference results in retransmission of dropped messages, the result may be a disproportionate amount of wireless resources being allocated to a subscriber access unit which is prone to interference, sometimes called a lossy link. The allocation of wireless transmission resources to retransmit wireless messages over a lossy link can have a detrimental effect on wireless resources available for other users. Accordingly, it would be beneficial to provide a system and method for a subscriber access unit to register device capabilities with a base station processor to determine the degree to which a particular subscriber access unit may be prone to interference, and adjust transmission constraints for that subscriber access unit accordingly.
- In a wireless telecommunications network, a method for managing transmission constraints based on subscriber device capabilities allows transmission constraints to be set for each user to maximize throughput in the wireless telecommunications network. A set of device capabilities corresponding to a local transceiver device or subscriber access unit connected to the user in the wireless telecommunications network is determined. The device capabilities are registered with a remote wireless transceiver device such as a base station processor, which is in wireless communication with the local transceiver device. A set of transmission constraints is computed based on the device capabilities, and the transmission constraints corresponding to the transceiver device are applied to the wireless transmissions between the transceiver device and the remote transceiver device.
- The wireless transceiver device is typically a subscriber access unit connected to a user device such as a user PC, and the remote transceiver device is a base station processor which is also in wireless communication with other subscriber access units. The device capabilities include antenna characteristics, and whether the user mobility is fixed, mobile, or a pedestrian. When activated, the subscriber access unit transmits the device capabilities to the base station processor. Alternatively, the base station processor can receive the device capabilities from a central repository such as a wireless Internet facility (WIF), based on an index such as a subscriber ID or electronic serial number (ESN) which is indicative of the subscriber access unit. The base station processor receives and stores, or registers, the device capabilities, and computes a set of transmission constraints based upon the ability of the subscriber access unit to receive wireless transmissions. The transmission constraints are computed on an expected likelihood of interference and dropped packets, and include parameters such as transmission power, forward error correction (FEC) coding rate, and modulation.
- The transmission constraints are computed such that a subscriber access unit which is more prone to interference and lost packets does not consume a disproportionate share of wireless transmission resources. A subscriber access unit that is nearby, stationary, and transmitting with a directional antenna is likely to experience little interference and is more likely of sustaining a relatively high transmission throughput rate. Accordingly, the base station processor may allocate more wireless transmission resources, such as wireless channels, to such a user. Similarly, a user that is distant, mobile, and transmitting with an omnidirectional antenna is likely to experience more interference and lost packets. Accordingly, the transmission constraints computed by the base station processor may include increasing the error correction rate and limiting the overall transmission rate so that the base station processor does not allocate excessive resources in order to maintain a high data rate over a lossy link.
- The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments of the invention, as illustrated in the accompanying drawings in which like reference characters refer to the same parts throughout the different views. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention.
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FIG. 1 shows a wireless communication system suitable for performing wireless transmission according to the present invention; -
FIG. 2 shows wireless omnidirectional and directional antennas in a cell; -
FIG. 3 a shows an access unit registration table; -
FIG. 3 b shows a transmission constraint table; -
FIGS. 4 a-4 c show an example of registration and transmission according to the invention as defined by the present claims; and -
FIG. 5 shows a flowchart of subscriber access unit registration. - A description of preferred embodiments of the invention follows.
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FIG. 1 shows a wireless communication system suitable for performing wireless subscriber registration according to the invention as defined by the present claims. Referring toFIG. 1 , auser PC 12, or other access point into a user computer system or local area network is in communication with a subscriber access unit 14 via awired connection 20. Thewired connection 20 may be any suitable wired medium such as TCP/IP, Ethernet, or direct connection. The subscriber access unit 14 is in communication with a wireless transceiver, such as thebase station processor 16, via awireless link 24, and is operable to transmit wireless messages in an RF medium between the subscriber access unit 14 and thebase station processor 16. Thebase station processor 16 is connected to the Internet 18 or other public access network via theInternet connection 22. TheInternet connection 22 may also be any suitable wired line connection, such as TCP/IP, UDP/IP, Ethernet, Ti line, POTS (plain old telephone system) or other wired medium. An end user at the user PC 12 may therefore receive data from the Internet 18 via thewired connections wireless link 24 supported by thebase station processor 16 and the subscriber access unit 14. -
FIG. 2 shows wireless omnidirectional and directional antennas in a cell. Referring toFIG. 2 , the cell is provided wireless services by thebase station processor 16.Subscriber access units base station processor 16. Thesubscriber access unit 14 a is connected to anomnidirectional antenna 22, and thesubscriber access unit 14 b is connected to adirectional antenna 26. Thebase station processor 16 is also connected to anantenna 28, and transmits and receiveswireless signals 30 to and from thesubscriber access units antennas - Each of the
subscriber access units - As indicated above, the
omnidirectional antenna 22 transmits a signal of equal strength in all directions by employing a singleradiating element 32. Thedirectional antenna 26 transmits a focused signal which is stronger in a particular direction via anantenna array 36 having multiple radiating elements 34 a-34 e in the example shown. Various numbers and arrangements of radiating elements are configurable in an antenna array depending on the transmission characteristics sought. In a particular embodiment, the directional antenna has four radiating elements which form a square around a central fifth radiating element. - Depending on the antenna type, it may be beneficial to adjust certain transmission constraints. In the case of an
omnidirectional antenna 22, it may be beneficial to reduce the power level employed, so as to minimize interference with signals between other subscriber access units 14 n. Similarly, it may be beneficial to increase error correction such as the forward error correction (FEC) coding rate to reduce the number of lost packets, or to reduce the data throughput rate so that disproportionate wireless transmission resources are not expended. On the other hand, in the case of adirectional antenna 26, it may be beneficial to increase the power level because the signals may be steered towards theantenna 28 connected to the base station processor. Further, a reduction in the FEC rate or an increase in data throughput rate may be performed if the link can effectively maintain a low rate of lost packets at a set of new transmission constraint settings. Other transmission constraints, discussed further below, are possible. - The transmission constraints may be adjusted in response to observed transmission characteristics over the wireless link. The transmission characteristics which may be observed include bit error rate (BER), interference level, dropped packets, and received power level. Other characteristics may also be employed. By observing transmission characteristics, a likelihood of a particular transmission succeeding can be determined. The likelihood is employed in computing transmission constraints for the subscriber access unit 14 n.
- When a subscriber access unit 14 n enters a cell or is turned on in a cell, the device capabilities of the particular subscriber access unit 14 n are received by the corresponding
base station processor 16. The device capabilities may be sent by the subscriber access unit 14 n itself, or may be sent from a wireless internet facility (WIF) based on a unique identifier such as an electronic serial number (ESN) or subscriber ID. The base station processor then regulates the transmissions by the subscriber access unit according to the device capabilities. -
FIG. 3 a shows an access unit registration table, andFIG. 3 b shows a transmission constraint table. Referring toFIG. 3 a, the access unit registration table 38 stores a subscriberprofile having parameters 40 indicative of subscriber device capabilities. The table 38 storessubscriber profile entries 42 corresponding to each subscriber access unit 14 n (FIG. 2 ). The subscriber profile entries list, for each subscriber, asubscriber ID 39 a, which uniquely identifies the subscriber, a subscriber type 39 b, which identifies the mobility of the user, an antenna type 39 c, identifying the type of antenna employed by the subscriber access unit, and a transmission profile ID 39 d, which is an index into the transmission constraint table 44 (FIG. 3 b). - Referring to
FIG. 3 b, the transmission constraint table 44 storestransmission profile entries 48 indicative of thetransmission constraints 46 which should be applied to each subscriber access unit 14. Thetransmission constraints 46 include power level 54 b, indicative of the power, in dBm units, which should be employed for the corresponding subscriber, an FEC rate 54 c, typically ½, ⅓, ¼, or ⅘, and amodulation type 54 d, such as Binary Phase Shift Keyed (BPSK), Quadrature Phase Shift Keyed (QPSK), 16 bit Quadrature Amplitude Modulation (QAM 16), orQAM 64. Atransmission profile identifier 54 a is mapped from the transmission profile identifier 39 d in the access unit registration table 38, and identifies whichtransmission constraints 54 b, 54 c, and 54 d should be imposed on a particular subscriber access unit. In the example shown, the subscriber access unit corresponding to subscriber profile entry 50 a maps to transmission profile entry 52 a, andentry 50 b maps to 52 b, as shown by the transmission profile indices P1 and P2. -
FIGS. 4 a-4 c show an example of registration and transmission. Referring toFIGS. 4 a-4 c, with respect to the system described inFIG. 2 , twosubscriber access units base station processor 16.Subscriber profile entry 56 corresponds tosubscriber 14 a, and subscriber profile entry 58 corresponds tosubscriber 14 b, both stored in aregistration database 70 connected to thebase station processor 16. As shown in the access unit registration table 38′,subscriber 14 a is a mobile user with an omnidirectional antenna, and corresponds totransmission profile entry 60 in the transmission constraint table 44′. Aregistration manager 72 in thebase station processor 16 computes transmission constraints, and stores them in thetransmission profile entry 60. Acapacity manager 74 in the base station processor then applies the transmission constraints to transmissions between thesubscriber access unit 14 a and thebase station processor 16, as shown byarrow 76. Accordingly, referring to thetransmission profile entry 60,subscriber 14 a is allocated only a power level of 23 dBm, so as to minimize interference with adjacent cells, has an FEC rate of ±2 because it is likely that robust error correction will be needed, QPSK modulation is to be employed, and the maximum data rate allowed will be 0.050 mbps, so thatsubscriber access unit 14 a will not be allocated an excessive number of wireless channels which could otherwise be allocated to more capable users.Subscriber access unit 14 b, on the other hand, is a fixed user with a directional antenna having four degrees of freedom, as shown by subscriber profile entry 58, stored in theregistration database 70. Accordingly,subscriber access unit 14 b has a higher capacity thansubscriber access unit 14 a. Therefore, the transmission constraints imposed onsubscriber 14 b are less restrictive to allow higher throughput, shown by arrow 78. These constraints are computed by theregistration manager 72 and are stored intransmission profile entry 62, including a power level of 33 dBm, since the subscriber access unit is employing a directional antenna, a faster but less robust FEC rate of ⅘, because less error correction is likely to be needed, afaster QAM 64 modulation, and a data rate of 0.366 mbps, which will result in more wireless channels being allocated to this device by thecapacity manager 74 due to increased capacity for wireless traffic. -
FIG. 5 shows a flowchart of subscriber access unit registration. Referring toFIG. 5 , a subscriber access unit is activated by moving into a cell or being turned on in the cell, as depicted atstep 100. An initial transmission occurs in which the ESN and the subscriber ID are sent to the base station processor, as shown atstep 102. A check is performed to determine if the device characteristics are stored at the subscriber access unit, as shown atstep 103. If the device characteristics are stored at the subscriber access unit, they are sent to the base station processor, as disclosed atstep 104. Otherwise, the WIF sends the device characteristics to the base station processor based on the ESN or the subscriber ID, as depicted atstep 106. The a subscriber profile entry containing the device characteristics are stored in the access unit registration table, as shown atstep 108. Based on the device characteristics, a set of transmission constraints is computed, as disclosed atstep 110. A transmission profile entry is created and mapped to the subscriber profile entry to store the transmission constraints for this subscriber access unit, as shown atstep 112. The transmission constraints are then employed in wireless transmission between the subscriber access unit and the base station processor, as depicted atstep 114, until a triggering event occurs. A triggering event is indicative of a need to recompute the transmission constraints and update the transmission profile entry. Such a triggering event may include expiration of a predetermined update interval, or a threshold event such as change in the number of subscriber access units supported. When a triggering event occurs, as shown atstep 116, control reverts to step 110 and a new set of transmission constraints is computed, and control continues as described above. - Those skilled in the art should readily appreciate that the programs defining the subscriber device registration operations and methods defined herein are deliverable to a subscriber access unit and to a base station processor in many forms, including but not limited to a) information permanently stored on non-writeable storage media such as ROM devices, b) information alterably stored on writeable storage media such as floppy disks, magnetic tapes, CDs, RAM devices, and other magnetic and optical media, or c) information conveyed to a computer through communication media, for example using baseband signaling or broadband signaling techniques, as in an electronic network such as the Internet or telephone modem lines. The operations and methods may be implemented in a software executable by a processor or as a set of instructions embedded in a carrier wave. Alternatively, the operations and methods may be embodied in whole or in part using hardware components, such as Application Specific Integrated Circuits (ASICs), state machines, controllers or other hardware components or devices, or a combination of hardware, software, and firmware components.
- While the system and method for subscriber device registration have been particularly shown and described with references to embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention encompassed by the appended claims. Accordingly, the present invention is not intended to be limited except by the following claims.
Claims (37)
1. A method for managing transmission constraints based on subscriber device capabilities comprising:
determining a set of device capabilities corresponding to a transceiver device;
registering the device capabilities with a central wireless transceiver device;
computing a set of transmission constraints based on the device capabilities; and
applying the transmission constraints corresponding to the transceiver device to transmissions between the transceiver device and the central transceiver device.
2. The method of claim 1 , wherein the transceiver device is a wireless subscriber access unit and the central transceiver device is a base station processor.
3. The method of claim 2 , wherein the device capabilities are received from a centrally located database in electronic communication with the base station processor.
4. The method of claim 3 , wherein the centrally located database stores a predetermined sets of data.
5. The method of claim 3 , wherein the centrally located data base is a wireless Internet facility (WIF).
6. The method of claim 2 , wherein the device capabilities are stored at the Subscriber Access Unit and are sent by the subscriber access unit to the base station processor.
7. The method of claim 1 , wherein the transmission constraints include parameters selected from the group consisting of transmission power, forward error correction (FEC) coding rate, and modulation.
8. The method of claim 1 , wherein the device capabilities include parameters selected from the group consisting of fixed, mobile, and pedestrian.
9. The method of claim 1 , wherein the device capabilities further include antenna characteristics.
10. The method of claim 9 , wherein the device capabilities are indicative of an antenna array.
11. The method of claim 10 , wherein the antenna array comprises one radiating element.
12. The method of claim 10 , wherein the antenna array comprises 5 radiating elements.
13. The method of claim 9 , wherein the antenna characteristics include characteristics selected from the group consisting of omnidirectional, one degree of freedom, and multiple degrees of freedom.
14. The method of claim 1 , wherein computing the transmission constraints further comprises computing transmission constraints in response to observed transmission characteristics.
15. The method of claim 14 , wherein the observed transmission characteristics include characteristics selected from the group consisting of bit error rate (BER), interference level, dropped packets, and received power level.
16. The method of claim 14 , wherein the transmission constraints limit the power level when the device capabilities indicate mobile.
17. The method of claim 14 wherein the transmission constraints include transmitting at an increased power level when the device capabilities indicate fixed.
18. A system for managing transmission constraints in a wireless network comprising:
a plurality of wireless transceiver devices operable to transmit and receive wireless messages, the wireless transceiver devices having device capabilities;
a registration manager operable to compute transmission constraints for the wireless transceiver devices based on the device capabilities; and
a capacity manager operable to apply the transmission constraints to at least one of the wireless transceiver devices.
19. The system of claim 18 , further comprising a registration database operable to store the device capabilities corresponding to the wireless transceiver devices.
20. The system of claim 18 , wherein the transceiver devices further comprise wireless subscriber access units and base station processors, wherein the registration manager is in the base station processor.
21. The system of claim 20 , wherein the transmission constraints include parameters selected from the group consisting of transmission power, forward error correction (FEC) coding rate, and modulation.
22. The system of claim 20 , wherein the device capabilities are received from a centrally located database in electronic communication with the base station processor.
23. The system of claim 22 , wherein the centrally located database is a wireless Internet facility (WIF).
24. The system of claim 20 , wherein the device capabilities are sent by the subscriber access unit to the base station processor.
25. The system of claim 18 , wherein the device capabilities include parameters selected from the group consisting of fixed, mobile, and pedestrian.
26. The system of claim 18 , wherein the device capabilities further include antenna characteristics.
27. The system of claim 26 , wherein the device capabilities are indicative of an antenna array.
28. The system of claim 27 , wherein the antenna array comprises one radiating element.
29. The system of claim 27 , wherein the antenna array comprises 5 radiating elements.
30. The system of claim 26 , wherein the antenna characteristics include characteristics selected from the group consisting of omnidirectional, one degree of freedom, and multiple degrees of freedom.
31. The system of claim 18 , wherein the registration manager is further operable to compute the transmission constraints in response to observed transmission characteristics.
32. The system of claim 31 , wherein the observed transmission characteristics include characteristics selected from the group consisting of bit error rate (BER), interference level, dropped packets, and received power level.
33. The system of claim 31 , wherein the transmission constraints limit the power when the device capabilities indicate mobile.
34. The system of claim 31 , wherein the transmission constraints increase the power level when the device capabilities indicate fixed.
35. A computer program product having computer program code for managing transmission constraints based on subscriber device capabilities comprising:
computer program code for determining a set of device capabilities corresponding to a transceiver device;
computer program code for registering the device capabilities with a central wireless transceiver device;
computer program code for computing a set of transmission constraints based on the device capabilities; and
computer program code for applying the transmission constraints corresponding to the transceiver device to transmissions between the transceiver device and the central transceiver device.
36. A computer data signal for managing transmission constraints based on subscriber device capabilities comprising:
program code for determining a set of device capabilities corresponding to a transceiver device;
program code for registering the device capabilities with a central wireless transceiver device;
program code for computing a set of transmission constraints based on the device capabilities; and
program code for applying the transmission constraints corresponding to the transceiver device to transmissions between the transceiver device and the central transceiver device.
37. A system for managing transmission constraints in a wireless network comprising:
means for determining a set of device capabilities corresponding to a transceiver device;
means for registering the device capabilities with a central wireless transceiver device;
means for computing a set of transmission constraints based on the device capabilities; and means for applying the transmission constraints corresponding to the transceiver device to transmissions between the transceiver device and the central transceiver device.
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