CN1085473C - Data transmission in radio telephone net work - Google Patents
Data transmission in radio telephone net work Download PDFInfo
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- CN1085473C CN1085473C CN95100020A CN95100020A CN1085473C CN 1085473 C CN1085473 C CN 1085473C CN 95100020 A CN95100020 A CN 95100020A CN 95100020 A CN95100020 A CN 95100020A CN 1085473 C CN1085473 C CN 1085473C
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Abstract
In order to carry out the bidirectional transmission of packaged data, a packaged data service unit lies in a digital cellular system connected with a mobile switching center, wherein the packaged data service unit connects the cellular network to a data network. When a mobile station is connected with the packaged data service unit, signals relevant to the connection forming characteristics of the network are firstly realized, which enables the mobile station and the data service unit to be provided with a plurality of storage parameters. When the mobile station is desirous to transmit or receive data packages, a packaged data transmission channel is established between the mobile station and the data service unit by the data and the signals of a virtual channel. After transmission is ended, at least a radio channel is disassembled, but the virtual channel is reserved.
Description
The present invention relates to the transfer of data in the wireless telephony network.
Having shown an example of wireless telephony network among Figure 1A, is traditional digital cellular network in the case.This network comprises base station controller BSC, and each BSC controls several base transceiver stations (BTS).This BTS links to each other through radio communication channel with mobile radio station.Base station controller and coupled base station have formed a base station sub-system.BSC links to each other with the mobile switching centre (MSC) of control base station sub-system by digital trunk.This MSC is that communication service selects to be routed to general PSTN or dedicated network (such as LAN).Physically, base station controller can also be positioned at mobile switching centre.The service in base station scope constitutes a cell, and the mobile radio station in this scope of business generally provides professional by this base station for it.This mobile radio station can move to another cell from a cell, and under the situation about being connected that does not lose with wireless telephony network, moves under the control of another controller under the control of a base station controller.
In known cellular network, data message can transmit between the initial network of mobile radio station and terminal or destination network.This terminal network can comprise another network of an initial network, identical systems, fixing telephone network or data network.This Network generally comprises from this cellular network to external telephone network PSTN, Circuit Switching Data Network network or an isdn network synchronously and the asynchronous circuit swap data transmit.And formulated externally and realized the suggestion that asynchronous packet exchanges on the packet switched data network.
Shown in Figure 1A, the data that sent by mobile radio station enter a date interworkmg function unit IWF who interrelates with mobile switching centre, be sent to the center through a modulator-demodulator, again from the center, for example pass through PSTN, and further be sent to a destination apparatus or target data network, such as the dedicated lan network.Thereby the network of this transition is general telephone network.
A kind of typical method in transmission data between the network and in network is circuit switching, has wherein set up a transmission channel that is used to transmit data.Set up a channel and be time consuming operation and set up channel with transmitting data information before, need a large amount of signalings, such as foundation of the request of transmitting control channel and channel allocation, confirmation inspection, encryption mode or the like.When being applied to transfer of data, circuit switching is uneconomic, because transmission needs wide frequency bandwidth.No matter whether transmitted data, all the user is chargeed.This is that this is uneconomic aspect capacity owing in circuit-switched network, before full detail is transmitted, must occupy channel.Owing in circuit-switched network, user's charging is normally carried out according to the length that keeps the connect hours, so the user need be for " spacing " payment, because be used for the sub-fraction that the time of actual data transfer is total connect hours.Usually, cellular network is mainly speech transmissions optimization, and for this purpose, the circuit switched data transmission is suitable.
In digital cellular network, such as at Europe GSM network with meeting in U.S.'s network of EIA/TIA (Electronic Industries Association/Telecommunication IndustryAssociation) standard, formulated about resembling grouping, resembling the suggestion of the such data communication of so-called grouped data, for example, at patent US4, in 887,265.It discloses a kind of system, and wherein some mobile radio stations send grouped data on same channel a base station.When base station controller received a data channel assignment request from this mobile radio station, it sent a channel allocation to this mobile radio station, thereby this mobile radio station is moved on this data channel.This channel can also be used by the every other mobile radio station in the described regional extent.Request, channel allocation and the transmission on a channel require a large amount of signalings.In described system, it also is possible switching from the data connection of base station to another base station.In the disclosed system of described patent, for transmitted in packets provides permanent channel, it is always utilizable, and irrelevant with instantaneous needs.
According to a first aspect of the invention, provide a radio telephone system, it comprises:
Mobile radio station; And
Fixed station, wherein can be by mobile radio station parameter that is used to set up data communication channel of this fixed station storage, and can be used to set up the fixed station parameter of data communication channel by this mobile radio station storage, between mobile radio station and fixed station, forming the data communication virtual channel, thereby be convenient to the foundation of the real channel of data communication.
According to a second aspect of the invention, provide a kind of method of transmission data in wireless telephony network, it comprises:
Storage is used for setting up at a fixed station mobile radio station parameter of data communication channel; And
Storage be used for this mobile radio station set up a data communication channel the fixed station parameter, be used between this mobile radio station and this fixed station forming a data communication virtual channel, thereby be convenient to the foundation of the real channel of data communication.
According to a third aspect of the present invention, provide a kind of radio telephone, it is suitable for storing the parameter of the communication channel that is used to set up fixed station, forming the data communication virtual channel with this fixed station, thereby is convenient to the foundation of the real channel of data communication.
These aspects of the present invention provide such advantage, promptly can promptly set up the real channel of data communication when a mobile radio station wishes to transmit data.Between transfer of data, the real channel of data communication can be switched to the data communication virtual channel, thinks promptly to rebuild and gets ready.Therefore, communication channel is without continuous openness, even also be like this when not having actual data transfer.Therefore, the cost of transmission data has obtained reduction.
Perhaps, under mobile radio station with data transmission capabilities and situation, or under the situation of the mobile radio station request msg communication channel of having registered with this fixed station, can form this data communication virtual channel in fixed station registration.Only under the situation of mobile radio station request msg communication channel, form the advantage of data communication virtual channel, be to avoid unnecessary signaling.
Alternatively, this data communication channel can be to be generally speech transmissions or signaling or control transmission and the channel that keeps.Adopt the concrete advantage of signaling or control channel to be, the transmission of data does not reduce to offer the number of the voice channel of system user.
Data communication channel advantageously is suitable for transmitting grouped data, and it is the transmission form that is particularly suitable for adopting the data communication channel that can promptly open or close.
Another advantage is that packet can form and directly be transferred to data network at mobile radio station, and does not need the transition network, such as minute assembling/tear open device (PAD) or adopt PSTN.In addition, mobile radio station itself can receiving block data, and promptly system is two-way.
For example, a kind of suitable present already used existing cellular system is the Europe gsm system.
Only by way of example and in conjunction with the accompanying drawings, embodiments of the invention are described now.In the accompanying drawings:
Fig. 1 represents a cellular network,
Fig. 2 is the schematic diagram of the logic channel of gsm system,
Fig. 3 has shown the structure of channel request,
Fig. 4 has shown the startup signaling of virtual channel,
Fig. 5 has shown the step of transmitting grouped data,
Fig. 6 has shown the termination signaling of virtual channel,
Fig. 7 has shown a stage after channel forms,
Fig. 8 is the schematic diagram of base station,
Fig. 9 has shown the mobile phone of the transfer of data that starts,
Figure 10 has illustrated the DTD in the mobile phone,
Figure 11 has shown the form of packet data message,
Figure 12 has shown the form of another packet data message,
Figure 13 has shown the order of the RACH frame of calibration pulse string
Figure 14 has shown the stage of packet data transmission, and
Figure 15 has shown the signaling process when connection at the interface is destroyed.
In an object lesson of cellular network, the actual channel of mobile radio station and base station, i.e. wireless channel, form by frame in succession, and these frames are made up of time slot, are transmitted in one of these time slots and carry out, be received in another time slot and carry out, then carry out intercepting of paging or the like at another.Corresponding time slot group has become logic channel, and a large amount of logic channels can be arranged.
In digital cellular network, mobile radio station can transmit and receive data on the communication channel that is exclusively used in speech and transfer of data.The two can not carry out simultaneously, and in them which user or network selecting transmit.Data and language are sent with binary sequence on wireless channel.This means that in transmission time slot at very brief data pulse string of mid portion transmission of time slot, thereby the considerable part that is used in the total time of transmitting device is the time between the pulse train, that do not have message transmission.
In the GSM network, defined the data service of a kind of particular type that is called as Packet data service.In described business, data send the selected number notifying network of mobile radio station need set up and finish same data network, net X.25 for example, the circuit switching connection between the branch that the is connected assembling/singulated unit (it can be that device or packet handler are assembled/torn open to branch).Device (PAD) is assembled/torn open to this branch can be after isdn network is installed or be installed in to isdn network.This mobile radio station is delivered to PAD or PH with data with the form of continuous data stream rather than grouping, and PAD or PH form packet and they outwards are sent to the destination through data network.If PH is so-called basic grouped processor, no matter in any net, then data connect the some PH place that always is positioned at through given.This master data processor is also supported the portable terminal direction in data send.On the other hand, so-called packet dedicated processor or PAD do not support this portable terminal direction.Service analogue between mobile radio station and apparatus for grouping synchronously or simultaneous asynchronous data transmissions, it is according to radio communication protocol RLP.
In the data packet services of GSM network, in mobile radio station, do not produce grouping, but in PAD, produced grouping.This business is initiated by mobile radio station in connection, and promptly need to send a request to network be unidirectional to set up that data connect on this meaning at the station.Remove non-mobile station itself and at first asked opening of circuit, grouping can not be sent to mobile radio station.Be also to be noted that data through the telephone network transmission, the price of its transfer of data is more much higher than the price of transmitting in data network.
The transmission of packet and receiving function can be positioned in and be positioned at all mobile radio stations or just among their part.For the mobile radio station that does not have this function, transmission of packet data must be opaque fully, so that dissimilar mobile radio stations can be worked without any problem ground in network simultaneously.Therefore, the grouped data feature is the extra business that this network provides, though need mobile radio station to have the characteristic of using this service.The enforcement of this system must be such, and promptly its only requires the Digital Cellular System of present employing is carried out a little change, and as extra feature, it is applicable to present system very much, such as GSM, the DCS 1800 or the PCN that work under 1.8GHz.
In new network, the most frequent definite be so-called short message service, one of them mobile radio station can be to send and receive temporary transient short message.Yet, the linking format route of the transmission requirement standard of short message, thus require the part of frequency band, thereby limited institute can a data quantity transmitted.
For transmitting grouped data, the data route of the radio channel of distribution and process network is not taken continuously.According to the present invention, transmit in network for the packet between mobile radio station and the mobile switching centre and to set up virtual channel.When the phone that has packet data functionality enters in the scope of mobile switching centre, it is designated as a user of Packet data service, carry out the signaling that is necessary, be this center subsequently, or more particularly for the Packet data service unit (agent apparatus) that interrelates with it provides its needed all information about this phone, and set up real transmission channel.This data that in fact comprised the information relevant with the position of phone are called as virtual channel.This virtual channel thereby be virtual connections between mobile radio station and the data service unit, it makes it possible to promptly be converted to data-transmission mode, and with reference to the parameter in the memory that is stored in mobile radio station and data service unit.When grouped data has been transferred to network or during from Network Transmission to telephone set, has not needed complete signaling between telephone set and center, because this has carried out in the early stages from telephone set; On the contrary, between mobile radio station and Packet data service unit (agent apparatus),, can very rapidly set up real transmission route, carry out transmission packets thereon by very low level signaling.In case do not have grouped data to transmit, transmission route or be that wireless channel is released immediately at least.On the contrary, as long as mobile radio station is listed in the data service, virtual channel just is maintained at standby condition always.According to the present invention, can very rapidly realize and being connected of packet data transmission pattern, and only when having thing to transmit, transmission route just is retained.
The device of control transmission of packet data is positioned to mobile switching centre and connects together, and is called as data service unit (agent apparatus), and it can be computer or processor.It is to be provided with somely to connect professional data service center and it can be connected with other networks and business thereof.This agent apparatus logically is placed in a moving exchanging center MSC, be positioned within this center though its physical location can be used as the part of processor or be positioned at outside this center, be connected with the center by transmission link with the form of or several computers.The core of this agent apparatus be one with this cellular network and the interface unit IFU that links to each other such as another network of TCP/IP or OSI network (TCP=transmission control protocol, agreement between the IP=network, OSI=open system interconnection).Therefore, the mobile radio station MS that has packet data functionality communicates with other networks by data service unit (agent apparatus), and virtual channel is ad hoc placed between it and the data service unit (agent apparatus).Therefore, under the control of mobile switching centre, utilize each mobile radio station of this Packet data service, be subjected to the supervision of the data service unit (agent apparatus) that interrelates with this mobile switching centre.
This agent apparatus is carried out at least some functions in the following function:
-under the control of mobile switching centre the registration have packet data functionality all phones,
The arrival of-notice telephone set message,
-when connecting end, telephone set is removed from register,
-with the transmission of messages of telephone set remainder to network,
-transmission of messages of the remainder of automatic network arrives telephone set in the future,
-in order to transmit effectively, message is carried out buffer memory through network,
-when needed, carry out encrypt/decrypt,
-when needs, carry out compression/the go compression between telephone set and the agent apparatus,
-renewal its database (position renewal),
-reception is addressed to the message of paging channel.
Under normal circumstances, when the user began to enable Packet data service, virtual channel was initialised, and this channel is terminated after the user breaks away from this business.In startup with in the time between stopping, promptly when being connected with this business, this mobile radio station can move and transfer to another cell from a cell.This forwarding function requires this virtual channel of cancellation and constitutes a new virtual channel.In fact the user can't see this transfer.
When entering cell, mobile radio station interception system information channel with the characteristic that obtains all cellular networks with from the constant transmission of base station, and learns in this network or cell whether using Packet data service by these mobile radio stations.A system information can comprise the identifier that for example indicates Packet data service.When mobile radio station was wanted to be connected with Packet data service, it sent a request of setting up virtual channel through the base station to network.Requestor's authenticity is checked in sequence by described network utilisation and be the distinctive standard of this network control signaling sequence and beginning with one in network in this request, begins to encrypt and provides temporary identifier for the requestor.The agent apparatus that interrelates with mobile switching centre and control Packet Service also obtains notice, thereby it is included in its control down to the supervision of mobile phone.This mobile switching centre keeps the registration to the position of mobile radio station at any time, thereby can carry out transfer from a cell to another cell, and can get ready rapidly, be converted to transfer of data or reception, because telephone set does not need requested service channel individually.
Except system information, no matter whether relate to packet data functionality, can also operate so that mobile radio station passes through a short message service request network.Network responds short message service by suitable message.This short message service SMS is the business that all comprises in most data network.
The control signaling relevant with the data connection management between data service unit of getting in touch with mobile radio station (agent apparatus) and the moving exchanging center MSC is to be performed with the data-message in signaling plan.Function in the signaling plan has foundation, keeps and stops the function that is connected between cellular network and other networks.It also comprises the function that is used to upgrade register, checking and casual user's number TMSI is provided.
A plurality of agreements can be used for the transmission of the packet between mobile radio station and the data service unit (agent apparatus).Yet radio interface is provided with some restrictions, such as the requirement that reduces by the interface data quantity transmitted as far as possible.This data volume can be reduced by the data segment of compressed packet.Before transmission, for example,, data are compressed, and receiver goes to compress to data with identical algorithm by means of compression algorithm V.42bis.In addition, the bit number in the packets headers of packet can be reduced.This function is responsible for by the virtual channel agreement, and this agreement also is responsible for the control messages between agent apparatus and the mobile radio station, and the grouping of upper-layer protocol is applicable in the frame of radio link protocol (RLP).
Set up virtual channel between mobile radio station and base station after, mobile radio station can not send and can not receive normal calling.On the contrary, can send and receive short message SMS.
In the time will sending packet, the request that mobile radio station distributes to the network transmitting channel.Owing to when beginning to form virtual connections, carried out and set up the required most of signaling of channel,, can promptly carry out so neededly extend to the foundation of the data packet transmission channel of agent apparatus this moment from mobile radio station.This means from channel assignment request to the time between the transmitted in packets very short.
This transmission can realize according to the first and second aspects of the present invention.As the user of mobile radio station during at DTD or when network closed packet data functionality when stopping this connection, the data route was cancelled and radio channel is released; Selectively, can keep virtual channel.
Refer to during the grouped data and start packet data functionality (notifying him to wish to be connected) from the user and begin to finish time till this business to the user with this business.During this period, the user can send grouping to terminal network, also can receive grouping from source network.Roaming and transfer are fine.During one, produced one or several virtual channels and connected, though each time has only one.
According to first embodiment, the radio channel that is used for the data route is the standard communication channel of cellular system, and this channel is used for by broadcasting transporting speech and non-grouping graphic data between mobile radio station and base station.When hope when mobile radio station sends (promptly move and send) data, this station by a base station to channel of network requests, this channel and usually mobile radio station send same signaling channel of use when being connected call request.The direct access communications channels that all mobile radio stations that this signaling channel is this cell use.This channel is connected to the base station from mobile radio station, and promptly it is the channel of so-called uplink direction.Because arbitrary access when channel request enters simultaneously, can produce conflict.In this case, need repetitive requests.This request message comprises a kind of specific bit architecture, and for example an identification burst is stood and reported the business that it is wanted by it, such as language, data, grouped data; Under existing conditions, this recognition structure shows that desirable business is a transmission of packet data.
In network processes this request and distributed Traffic Channel after, it sends a response to mobile radio station on signaling channel, this response comprises about this station should move on to transmitting grouped data information for which communication channel.The channel of network responsive channels request thereon is public access authorization channel and be the down link direction.Mobile radio station is transferred to its transmitter on the communication channel of distributing to it, and begins to send grouped data immediately.This transmitting continuous carrying out all is sent out up to all data.When having distributed communication channel, network can also start a kind of special counter or timer, thereby when counter or timer are then, transmission ending.Preferably with the storage that will transmit in a buffer of mobile radio station, and wipe this memory by transmission.
When grouped data according to first embodiment through network when being sent to a mobile radio station (portable terminal transmissions), it is that network is notified the beginning of mobile radio station packet data transmission with unique difference along the transmission of opposite direction.In order to send such information, adopted public paging channel.All mobile radio stations in cell are intercepted this common downlink paging channel (the speech paging just transmits) continuously on this channel.When mobile radio station has received the message of expression grouped data arrival, it is worked resembling under the situation that mobile radio station starts: it sends traffic channel request to the base station, on this channel, receive data, and move on to immediately on the Traffic Channel of distributing to it, thereby be ready to receive packet.When data flow finished, network was removed Traffic Channel, thereby it is discharged, so that other mobile radio stations in the cell can utilize it.The data that will transmit preferably are stored in the data buffer of data service unit (agent apparatus), and buffer can be completely erased immediately.
According to first embodiment, when sending grouped data, for such data have kept a Traffic Channel, such data are normally used for transmitting speech.When sending end, this Traffic Channel is released once more, so that allow any other mobile radio station use.Same mobile radio station can send another packet data transmission request, thereby makes the order of " channel request-transmission-channel discharges " can be repeated to carry out, and break away from Packet data service up to mobile radio station, and virtual channel is removed.
According to a second embodiment of the present invention, adopt a signaling channel or a control channel specially independently, perhaps can be with its alternate channel as the Traffic Channel that is used for transmitting grouped data.
According to this second embodiment, when mobile radio station wishes to send packet, when promptly mobile radio station started, its utilized the direct access communications channels that sends general channel request to send a channel request paging to the base station.Described channel is a uplink direction.All mobile radio stations in the cell all adopt identical channel to send the voice channel request.After receiving this request, mobile switching centre's decision mobile radio station should move on to the enterprising line data transmission of which channel.This channel can be benchmark service channel or control channel.Control channel can be same the direct access communications channels that the channel request from the mobile radio station to the base station is transmitted on it.Network is set up a Traffic Channel, as long as this channel has been selected as transmitting channel.It is to adopt the benchmark service channel or to adopt signaling channel to carry out the information of transfer of data that the base station sends about it to mobile radio station.This information sends on Common Control Channel, sends on the access authorization channel, and channel allocation is sent to mobile radio station on this channel.Mobile radio station moves on on the business or control channel of distribution like this, and begins to send grouped data immediately.In process of transmitting, channel can be from professional channel transfer to control channel, or opposite, even can carry out several times and shift.When sending end, channel is removed, and it is released for other processing uses.Be transmitted in and finish preset time afterwards or when slave station receives " grouping finishes " message, stop.
If network need send grouped data to mobile radio station, promptly portable terminal transmits, and it is by the public paging channel notice of standard station data packet transmission well afoot.This paging comprises special identification division (bit architecture), shows that packet data transmission has problem.In this paging, the identification burst of one second mobile radio station is replaced by the user's data part, comprises the grouping that arrives the user from the outside.If the grouping that comes from the outside can not be accommodated in the data segment of beep-page message, then it is divided into several beep-page messages, and mobile radio station receives all these message, and they are formed a grouping.When mobile radio station has received this grouping, identical mode was operated when it used with hope transmission packet subsequently: it sends a channel request to the base station, receive a channel allocation, move on on the channel of distributing to it, on Traffic Channel or the control channel, and confirm the grouping that it has received.
The base station is connected and can implements in some kinds of modes with data route between the agent apparatus that links to each other with mobile switching centre.A kind of may be to keep one directly to connect and keep continuously for Packet data service the described connection that is retained.This means the connection that exists, thereby do not form extra time delay.This connection can be a PCM time slot or the some PCM time slot in the digital trunk between base station system, BSS and moving exchanging center MSC.Receive when entering the regional extent relevant when having grouped data with this base station (for example BTS1 among Fig. 1) with the mobile radio station of transfer characteristic, network immediately between this base station and mobile switching centre foundation provide the direct of packet data transmission to be connected.This connection can be that one or several provides the time slot of packet data functionality in the common PCM trunk line that uses of all mobile radio stations.It is known that mobile radio station enters cell because it or transferred as the result of forwarding function, or enter the reception area existing problems, or when telephone set was switched on, telephone set was registered in the network from the external world.
In such as the foregoing description, the PCM channel in the network has obtained the maintenance that continues, but the radio routed channels only is retained when needed.
The use of PCM time slot also can be optimized, just be maintained because have only when base station system BSS comprises existing effective connection, directly to connect, promptly comprise a mobile radio station that links to each other with Packet data service at least one cell under the control of base station controller, and get ready for receiving and send grouped data.Directly connection is not disconnected when finding this professional user in the scope at BSS, and when first mobile radio station added Packet data service, connection was established once more.
Second kind may, be network with radio path between be connected and obtain as required setting up and removing.Example described below has comprised according to described second kind of connection that may provide.
Figure 1B has shown according to a kind of typical cellular network of the present invention, such as the GSM network that has Packet data service.A data business unit (agent apparatus) has been connected to mobile switching centre, and grouped data is according to OSI or ICP/IP protocol and directly be sent to data network therefrom, and is sent to an objective network-such as LAN again from this data network.This network is do not have data to pass through Circuit-switched telephone network PSTN with the different of network of Figure 1A.
According to Fig. 2, logic channel is divided into Traffic Channel TCH and control channel CCH.Traffic Channel is used to transmit speech and the data that are encoded.Its each can both be at full speed or Half Speed transmit.Control channel CCH is used to transmit signaling and synchrodata, therefore can distinguish three types channel: broadcast channel, common signal channel and dedicated channel.Below, " up link " refers to the direction from mobile radio station to the base station, and " down link " refers to from the base station to the direction of mobile radio station.
Broadcast channel comprises with lower channel:
-frequency calibration channel, FCCH, to mobile radio station transmitted frequency calibration data, down link,
-synchronizing channel, SCH is used for the recognition data to mobile radio station transmission synchrodata and base station, down link.
-cellular broadcasting channel, CBCH, short message service, two-way channel, and
-Broadcast Control Channel, BCCH is used for transmitting general information, down link on the base station.
Common signal channel comprises with lower channel:
-direct access communications channels, RACH, only along uplink direction, mobile radio station transmits the dedicated channel request thereon,
-public paging channel, PCH transmits the arrival of paging with notification call by its base station to mobile radio station, and this channel is only along the down link direction,
-access authorization channel, AGCH by its base station report Separate Dedicated Control Channel SDCCH, or reports that directly Traffic Channel TCH, described channel are down link.
Dedicated Control Channel comprises with lower channel:
-Separate Dedicated Control Channel, two-way, and
-assist control channel and assist control channel at a slow speed fast, these channels are two-way.
According to the present invention, Traffic Channel (two-way) TCH, paging channel PCH (unidirectional, down link), direct access communications channels RACH (unidirectional, up link) and access authorization channel AGC H (unidirectional, down link) have been adopted.In the Digital Cellular System beyond the GSM, also can find the channel of type of equal value.
Mobile radio station is intercepted the broadcast transmission control channel BCCH that is transmitted constantly by the base station of cell, and is apprised of by this channel and relates to Packet data service in the network.In addition-kind of rules are that mobile radio station comes to adopt or do not adopt packet data functionality in request on the cellular broadcasting channel in this network by sending a short message service.The base station is sent a short message and is responded on same channel.
When mobile radio station sends the user's become Packet data service request, between itself and mobile switching centre, carry out message sequence as shown in Figure 4.These incidents are read from the top down.After the mobile radio station channel request, followed by be the distribution (FACCH) of control channel, and requestor's identity has obtained checking (network challenge identification data and mobile radio station send a response) on this allocated channel, begins deciphering, and distributes a temporary identifier sign indicating number TMSI.Set up after this and also for good and all keep a radio link protocol.This means in a period of time, can under the situation that need not rebuild upright radio link protocol, carry out the transmission of packet.The data service unit (agent apparatus) that interrelates with the mobile switching centre that controls Packet data service obtains notice, thereby transmits the control to mobile radio station under the control of itself.This data service unit can not need extra signaling now and detect this mobile radio station, and encrypts and differentiate.Virtual channel from mobile switching centre to mobile radio station is established now.Finish (phone is discharged from data packet services) before during this section, radio link protocol can not be removed and remove virtual channel.
When mobile radio station was wanted to transmit data, it sent a request and thinks that actual grouped data sets up a transfer channel.This request is transmitted on public direct access communications channels RACH, and this channel is structurally with shown in Figure 3 similar.The front three of this message has been determined the character that connects, and sequence 001 refers to and sets up the packet connection requests.The ending of message is a random reference number.This message is the correction of standard GSM message.This base station receives this request, and after to sequential coding, and the signaling that will carry out below its notice mobile radio station will realize on which control channel, and the transmission of grouping will be carried out on which transfer channel.The described stage was described by uppermost two stages among Figure 15.Transmission channel from mobile radio station to base station controller is set up.On the channel that as above produces, mobile radio station sends first control messages, i.e. the phase III of Figure 15, provide slave station to the data of data service unit (agent apparatus) to connect thus, channel from mobile radio station to agent apparatus is finished after this, to carry out transfer of data.
When real channel (its first comprise a radio channel and thereafter a part comprise a PCM time slot) when being established between mobile radio station and base station in the above described manner, this mobile radio station can send grouped data immediately on described channel.After the network requirement transfer of data, the transmission of data packets of standing is if network validation should grouping and bust this then network sends the request of transmission again.Extremely the stage to this point has represented in Fig. 5.
After having sent all groupings, mobile radio station sends a request to cancel actual connection to network.After receiving this request, network transmits an order with the end data activity to mobile radio station, and mobile radio station is confirmed the end of described activity.These stages are represented in Fig. 6.To base station controller BSC and the data packet transmission channel that is sent to data service unit (agent apparatus) therefrom be removed.If adopt the method that connects according to direct PCM, described channel is retained.
The transmission of grouped data also can be to mobile radio station (being that it is a mobile terminating).A base station sends a paging to mobile radio station on public paging channel, the packet data transmission that notice is being advanced.This mobile radio station sends a channel request signal to the base station subsequently on public direct access communications channels RACH, thereby makes under this processing constantly and the situation about starting at above-mentioned mobile radio station identical: set up also receiving block data immediately of virtual channel.In Fig. 7, various situations are represented length by length.
Fig. 8 has shown the block diagram of the base station relevant with the present invention.This base station comprises some by frame unit and parallel branch that transmission/receiving element RX/TX constitutes.Base band interconnection element is connected the base station with the digital pcm link.The local channel of this link is retained, to be used for signaling and remainder is used for transfer of data.Digital signal from the PCM link is sent to frame unit, and they are aligned to tdma frame in this unit, it by chnnel coding, interweave and as pulse train through antenna TX and being sent on the radio path.Before being sent out, these pulse trains are modulated in Transmit-Receive Unit RX/TX, and have been transferred on the carrier frequency.When the base station received tdma signal from mobile radio station, this signal was sent to transceiver unit RX/TX through necessary filter, and it obtains demodulation, is transferred on the carrier frequency and modulation obtains expression there.Channel-decoding and remove to deinterleave and in frame unit FU, carry out.At last, data-signal is sent to the PCM circuit and is sent to the reception network through mobile switching centre therefrom.
Base station controller produces all message that send to radio path, and the message of all receptions all is sent to base station controller through the base station.Therefore, compare with the GSM of present use, embodiments of the invention are only required and do little change on the softwares of base station controller.On the software at mobile radio station and center, also need to change.All message that mobile radio station need be able to detect and transmission is relevant with packet data transmission.The message that is transmitted by mobile radio station can be produced by user's keyboard or be produced by the independent data terminal that links to each other with the station.
The invention describes and specifically to indicate packet and will on which concrete wireless channel, send, and set up the viewpoint of virtual channel.
According to first embodiment, be the radio channel that packet data transmission keeps, be the Traffic Channel TCH that is generally used for transporting speech.When the end of transmission, described Packet Data Channel is released, and thinks that any other mobile radio station is used.Below first embodiment will be described.
Referring to Fig. 9, it has shown the packet data transmission under the mobile radio station origination mode.This figure and Fig. 5 and description thereof are of equal value, and what also be illustrated in addition is in each message of which channel.So mobile radio station utilizes public direct access communications channels RACH to send a Packet Data Channel request to the base station, when standing in the request radio channel, all in this cell all use this channel.Answer by a traffic channel assignments on public access authorization channel AGCH the base station, carries out the affirmation of packet data transmission and reception after this on Traffic Channel.In the paging of transmitting on the direct access communications channels RACH " setting up reason ", comprise value 001 at Fig. 3.Described channel paging request is the correction to the standard channel paging of gsm system.Value " 001 " will represent that the direction of grouping is to mobile radio station from network.The value that its objective is " setting up reason " section under the situation that mobile radio station starts with under the situation of mobile radio station terminal, be different, higher with the priority that guarantees mobile radio station terminal situation because network is got ready for connection.
Network responds paging with the message that is called " grouped data distribution " on access authorization channel AGC H.This message is the correction that standard GSM message " is distributed " immediately.Correction is such, and promptly the bit architecture of " type of message " piece of described standard message is 00111101 in the present invention, and described structure is not used to other purpose in GSM.In message " grouped data distribution " afterwards,, on independent dedicated slow control channel SDCCH, proceed signaling, but carrying out on the assist control channel fast not as in the benchmark service channel communication.This should be included in the message that is sent to mobile radio station.This standard message comprises that a message part " channel description " and it comprise a unit " channel type ".Described unit notice must be connected with Traffic Channel.The bit architecture that full rate communication channel TCH and relative control channel FACCH are described is " 00001 ".In described unit, also the transmission time is given about TA and power control, and these all are that mobile radio station is needed.
When mobile radio station received described above-mentioned correction message, it moved on to this Traffic Channel immediately and begins data packet transmission.If require more signaling at mobile phone to the establishment of connection between mobile phone and the mobile switching centre before the data packet transmission transfer, this signaling can be carried out on full speed control channel FACCH so.
The operating time of Traffic Channel can be limited with respect to the available time or the number of grouping.The simplest and effective method may be transmission from all data of transmission buffer device and at the buffer sky after discharge Traffic Channel TCH.Since the reservation of actual channel as long as the hundreds of millisecond, can in phone, be provided with timer with the counter buffer sky after time.Traffic Channel can not be released, and is time-up up to what set, and grouping in the end is not transmitted afterwards and discharges immediately.So, can repeat transmission or more transmit (if in buffer, having accumulated more data), and need not set up channel.The use of timer has increased so-called intervention effect, rebulids channel because not be used under each situation.If transmission packets speed is very high, timer makes Traffic Channel TCH continue to be retained, and the user receives immediately and replys.The time set of timer can be fixed by the user.
The operator can also only select a Traffic Channel in cell, with transmission of data packets or a large amount of or even all Traffic Channels of same selection.
Figure 10 has schematically illustrated when grouped data will be sent to mobile radio station through network, the function of first embodiment.At first notify mobile radio station coming packet data transmission with unique network that is not both of opposite situation.This report is in the beep-page message of public paging channel PCH.When mobile radio station had received this paging, operation was continued, and under starting situation at mobile radio station, promptly mobile radio station sends a channel request to the base station, and operation is proceeded as illustrated in fig. 9.
Figure 11 has represented the form according to the packet data message of the setting of first embodiment.The grouping of virtual channel agreement VCP is the 3rd layer of generation of OSI on link layer on the principle, and is sent to radio link protocol through layer 2 relay function L2R, to transmit through broadcast interface (wireless path).This grouping comprises a packets headers and a data part.The sign that comprises the upper-layer protocol that will use in the packets headers.One of these upper-layer protocols, be used in the station and the agent apparatus that interrelates with mobile switching centre between the agreement of grouping of signaling.Other potential agreements are agreement between network (IP), OSI(Open Systems Interconnection) agreement and some facsimile protocol.The network operator of network can by agent apparatus with he oneself will with business add that these will be provided with their sign.This packets headers can also be provided with the section of the length that shows grouping.The number of the length of the data division of grouping or eight more high-rise hytes is variable.A grouping can be transmitted in one or more rlp frame.
Second embodiment of the present invention will be described, can transmit at Traffic Channel TCH or on public direct access communications channels RACH according to this embodiment grouped data, and a channel request can be aforesaid octet that it begins to be bit sequence " 001 ".Subsequently, network transmits a message request transmitting grouped data on access authorization channel AGC H, and described message is the correction of standard GSM message.The element of determining its type of message comprises bit architecture " 00111101 ", and its expression grouped data situation has problem.In piece " channel type ", bit architecture " 00001 " expression mobile radio station should move on to Traffic Channel TCH, with transmitting grouped data thereon, and bit architecture " 10000 " represents that it should rest on that direct access communications channels RACH goes up and in this channel packet.Which channel the network decision uses.If the telephone service in cell is a large amount of, then on communication channel, transmit, if but it is little, then use direct access communications channels RACH.
The duration of transmitting on direct access communications channels RACH is subjected to the restriction as time pre-value timer or counter TA, and promptly changes, and the channel reservation has occupied the possibility that other device requests connect.
Figure 12 has shown the form according to the packet data message of the setting of second embodiment.Each frame all has 8 sequence number SN as the sign that connects.It is produce by the base station and be transferred to mobile radio station with the assignment messages of grouped data.This sign is released after connecting end.Why this sign is arranged, and is owing to be included in the identical data in connection of direct access communications channels and Traffic Channel and can combine like this.Figure 13 has shown a kind of situation, and wherein grouped data is transmitted on a direct access communications channels.On this channel, grouped data is used as the calibration pulse string and transmits, and the figure illustrates the equivalence relation of RACH channel frame and calibration pulse string.
Mobile radio station can show to want which channel to transmit data with the form of hope.Each TCH and RACH are provided with two command bits, are used to notify channel frame subsequently.Arrive if move on to the request of Traffic Channel TCH, then the connection through the RACH channel can be interrupted, and similarly, arrives if move on to the request of RACH channel, and then the connection through the TCH channel can be interrupted.The command bit C of postamble can be moved the station and be used for the channel request of moving or other, and the end of transfer of data can be reported by it.Described two positions thereby can utilize as follows:
The identical channel in position " 11 "=move on to
Position " 01 "=move on to Traffic Channel TCH
Position " 10 "=transfer to public direct access communications channels and public paging channel PCH
Position " 00 "=end of transmission
The switching of transmission channel can be carried out in two ways.After the order of switching on channel sends, allow mobile radio station " asking channel in the Packet Data Channel request information and waiting for channel assignment message, so that can be chosen in its enterprising line data channel transmitted.Another kind method is the message of reading network side, and if when the request channel switches in command bit, without any " transmitting " grouped data distribution " message under the situation of grouped data request information.This grouping has been transferred to a plurality of rlp frames.One of these rlp frames are interleaved on 22 calibration pulse strings of TCH channel.
More than under situation according to second embodiment, the data packet transmission under the mobile radio station origination mode has been described.Grouped data is transferred to the situation of mobile radio station through network and the difference of above-mentioned situation only is, one of on public paging channel, sending at it of network specific " in the grouped data paging request information to following transmission of mobile radio station report, and its transmits this message on an order paging channel.This message is the correction of the paging of gsm system, and it has a free bit to be used for this purpose." 001000011 " is selected as this bit architecture.As a kind of expansion, in this message, added a data segment, be transferred to user's data and transmit therein.Receiving described beep-page message a series of beep-page messages of this grouping (or comprise) afterwards, open one of mobile radio station connects and also confirms this grouping.
Figure 14 illustrates to have shown the interim order of the incident when passing through network to the mobile radio station transmission of data packets.This transmitted in packets is at first carried out on a Traffic Channel, moves on on the direct access communications channels, turns back on this Traffic Channel also to turn back on the direct access communications channels subsequently.On direct access communications channels, the traffic carrying capacity time uses up, and connection is stopped by force.
From aforementioned description, those skilled in the art obviously can make various corrections without departing from the scope of the invention.
The scope of the present disclosure has comprised at this and has expressed or hint the novel feature announced or all popularizations of these combination of features or these features, no matter and whether it is relevant with desired the present invention or similar with any or all problem to be solved by this invention.The applicant it is pointed out that in the application or from the hearing process of any further application of its derivation and may propose new claim with regard to these features at this.
Claims (32)
1. radio telephone system comprises:
Mobile radio station, it has the related device that is used to set up first parameter of an actual data communication channel of storage and fixed station, and described practical communication channel has the spare physical path between described mobile radio station and described fixed station; And
Described fixed station has can be stored and the related device that is used to set up second parameter of described actual data communication channel of described mobile radio station, described fixed station is used to form the dummy data communication channel between described mobile radio station and described fixed station, described dummy data communication channel is utilized described first and second parameters and is lacked the backup path that described actual data communication channel is set up in preparation between described mobile radio station and described fixed station, quickens the foundation of actual data communication channel thus when data are intended communicating by letter between described mobile radio station and fixed station.
2. according to the system of claim 1, also comprise and transmit to intend being stored in the described fixed station parameter storage device and device related first parameter of described mobile radio station, so that when fixed station is registered, form the dummy data communication channel as the mobile radio station of its communication ability.
3. according to the system of claim 1, also comprise when the mobile radio station request of doing registration at fixed station and set up data communication channel, form the device of actual data communication channel.
4. according to the system of claim 1, comprise also forming the Traffic Channel that is generally Speech Communication and keeps and the device of the control channel between mobile radio station and fixed station that wherein the actual data communication channel is to be generally Speech Communication and the Traffic Channel that keeps.
5. according to the system of claim 1, comprise also forming the Traffic Channel that is generally Speech Communication and keeps and the device of the control channel between mobile radio station and fixed station that wherein the actual data communication channel is a control channel.
6. according to the system of claim 1, also comprise the control of communication device that is used to control between mobile radio station, fixed station and the external communication network.
7. according to the system of claim 1, also comprise and adjust the device that data communication channel makes it to be suitable for transmitting grouped data.
8. according to the radio telephone system of claim 1, wherein said mobile radio station comprises radio telephone.
9. digital time division cellular network, this network has base station and a plurality of mobile radio station, wherein move and the base station between radio channel comprise:
Be used to transmit the Traffic Channel (TCH) of speech and data,
With the control channel that each described Traffic Channel interrelates, described control channel comprises:
Direct access communications channels (RACH), from the mobile radio station to the base station transmit signals, the requested service channel,
Public paging channel (PCH) sends paging signal from the base station to mobile radio station,
Access authorization channel (AGCH), from base station transmit signals, the notice mobile radio station is distributed to its Traffic Channel,
Also further comprise:
The Packet data service unit that cellular network is linked to each other with a data network,
Mobile radio station is switched to the Packet data service unit, carries out the device of the signaling of the connection that is set up to network,
Among mobile radio station and data service unit, stored the device of several parameters associated with each other, described parameter comprises radio link protocol (RLP) and formed virtual channel, and described virtual channel has utilized described parameter and lacked the backup path between the described mobile radio station and described Packet data service unit when packet data traffic channel is set up in preparation;
Response is from the request of wanting to send or receive packet of a mobile radio station, between this mobile radio station and data service unit, utilize the parameter of virtual channel to set up the device of a packet data transport channel, the part of described packet data transport channel is that wireless channel between described mobile radio station and the base station and remainder are time slots in the digital trunk between described base station and described Packet data service unit
The device that packet is transmitted on described packet data transport channel;
The end that response packet is transmitted on described packet data transport channel, the device of the described at least radio channel of cancellation, and
Keep virtual channel, the device till mobile radio station breaks away from data service.
10. according to the network of claim 9, wherein the Packet data service unit comprises:
The device of all mobile radio stations that registration links to each other with Packet data service,
Any device that is addressed to its packet of notice mobile radio station,
Send the device of the packet be addressed to data network from mobile radio station,
To the device of the mobile radio station transmission message that enters from data network,
The device of buffer memory is carried out in grouping to data,
Carry out the device of encrypt/decrypt,
To sending to and compress/go the device that compresses from the data of mobile radio station,
The device of the database of the position of renewal mobile radio station,
What reception was addressed to cellular network is transferred to the device of mobile radio station from the packet of data network and with it, and
After breaking away from packet data service, mobile radio station in registration, removes the device of this mobile radio station.
11. network according to claim 9, wherein the Packet data service unit comprises the packet of adjustment from data network, make it to be suitable for the device of virtual channel protocol packet, described virtual channel protocol packet is made up of one or more wireless link service protocol (RLP) frame.
12. according to the network of claim 11, wherein the virtual channel protocol packet has identification division, this identification division shows that the content of grouping comprises signaling data or upper layer data grouping.
13. according to the network of claim 9, also comprise be arranged in mobile radio station when wanting to send packet, on direct access communications channels, send a device of setting up the request of transmission channel, described request is the correction that the standard channel of cellular network is set up request.
14. network according to claim 9, also comprise in response to packet and intend being sent to mobile radio station, on public paging channel, send a device that is arranged in the base station about the message of coming packet to it, and at the device on the mobile radio station of being positioned at that sends a request of setting up packet data transport channel on the direct access communications channels to the base station, described request is the correction that the standard channel of cellular network is set up request.
15., also be included in sending in the base station and be used in channel and set up the control channel data in the signaling and the device of packet data transport channel data to mobile radio station according to the network of claim 9.
16. network according to claim 15, the channel that also is included between mobile radio station and the Packet data service unit is set up after the signaling, set up the device with the described second portion of Packet data service grouping of cells data transmission channel, thereby the whole group data transmission channel is got ready for grouping transmits.
17. according to the network of claim 9, wherein said cellular network comprises a special-purpose fast access channel, also comprises making described channel set up the device that signaling is carried out on the described special-purpose fast access channel of cellular network.
18. network according to claim 9, also comprise the base station controller that links to each other with the base station, wherein the second portion of packet data transport channel is that direct pulse-code modulation from base station controller to the Packet data service unit connects, thereby no matter makes how the described second portion packet data transmission of packet data transport channel all is can usefulness.
19. according to the network of claim 9, wherein the second portion of packet data transport channel is the variable slot on pulse-code modulation (PCM) trunk line, also comprises the device that described second portion is removed after data packet transmission finishes.
20. according to the network of claim 9, wherein the first of packet data transport channel is a Traffic Channel.
21. network according to claim 9, also comprise when grouped data when mobile radio station is sent to the Packet data service unit, the first that makes packet data transport channel is a direct access communications channels, and when grouped data when the Packet data service unit is sent to mobile radio station, be the device of public paging channel.
22. according to the network of claim 9, also be included in the transport process of grouped data, the first that makes packet data transport channel is any one device of Traffic Channel and direct access communications channels and public paging channel.
23., wherein send to the broadcast paging messages of all mobile radio stations in the cellular network and on the data division of multicast and Radio Broadcasting Agreements, transmit respectively to the multicast beep-page message of some mobile radio station of cellular network according to the network of claim 9.
24. the method for transmission data in radiotelephony network comprises:
Store the parameter relevant at a fixed station, and set up the actual data communication channel between described mobile radio station and the described fixed station with mobile radio station; And
In this mobile radio station storage parameter relevant with this fixed station, be used to set up data communication channel, be used for being used to form dummy data communication channel between described mobile radio station and described fixed station forming a dummy data communication channel between this mobile radio station and this fixed station, described dummy data communication channel is utilized described first and second parameters and is lacked the backup path that described actual data communication channel is set up in preparation between described mobile radio station and described fixed station, quickens the foundation of the actual data communication channel between described mobile radio station and fixed station thus.
25. according to the method for claim 24, the mobile radio station that further is included in its communication ability forms the dummy data communication channel under the situation of fixed station registration.
26. according to the method for claim 24, further be included in the mobile radio station request of having registered and set up under the situation of data communication channel, form the dummy data communication channel to fixed station.
27. according to the method for claim 24, described network comprises and is generally Traffic Channel and the control channel that Speech Communication keeps, and further comprises and utilize the Traffic Channel that is generally Speech Communication and keeps to carry out the step of actual data communication.
28. according to the method for claim 24, described network comprises Traffic Channel and the control channel that is generally Speech Communication and keeps, and further comprises the step of a control channel as the actual data communication channel.
29. according to the method for claim 24, wherein said mobile radio station comprises radio telephone.
30. radio telephone, it has and is used to store be used to relevant with fixed station and sets up storage device with the parameter of the actual data communication channel of described fixed station, its utilizes and is stored in forming with the related parameter of described radio telephone and the dummy data communication channel of described fixed station in the described fixed station, the corresponding described stored parameter of described dummy data communication channel utilization and lack the backup path that described actual data communication channel is set up in preparation between described mobile radio station and described fixed station quickens the foundation of the actual data communication channel between described radio telephone and fixed station thus.
31. according to the radio telephone of claim 30, also be included in described radio telephone and have its communication ability and described radio telephone under the situation of this fixed station registration, described parameter is stored in device in the described storage device.
32. according to the radio telephone of claim 30, also be included in described radio telephone and set up under the situation of a data communication channel, described parameter is stored in device in the described storage device to registration of this fixed station and request.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95100020A CN1085473C (en) | 1995-03-01 | 1995-03-01 | Data transmission in radio telephone net work |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95100020A CN1085473C (en) | 1995-03-01 | 1995-03-01 | Data transmission in radio telephone net work |
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| CN1130333A CN1130333A (en) | 1996-09-04 |
| CN1085473C true CN1085473C (en) | 2002-05-22 |
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| CN95100020A Expired - Lifetime CN1085473C (en) | 1995-03-01 | 1995-03-01 | Data transmission in radio telephone net work |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US6122263A (en) * | 1997-06-10 | 2000-09-19 | Telefonaktiebolaget Lm Ericsson | Internet access for cellular networks |
| JP3090131B2 (en) | 1998-11-20 | 2000-09-18 | 日本電気株式会社 | Connection hold control method and control circuit in ATM exchange |
| US6697347B2 (en) * | 2001-08-22 | 2004-02-24 | Nokia Mobile Phones Ltd. | Method and apparatus for controlling transmission of packets in a wireless communication system |
| US7130313B2 (en) * | 2002-02-14 | 2006-10-31 | Nokia Corporation | Time-slice signaling for broadband digital broadcasting |
| US20050099998A1 (en) * | 2003-11-07 | 2005-05-12 | Samsung Electronics Co., Ltd. | System and method for establishing mobile station-to-mobile station packet data calls between mobile stations in different wireless networks |
| CN101018351B (en) * | 2006-02-08 | 2012-08-29 | 上海原动力通信科技有限公司 | Method for transferring the short data with the competitive channel |
| KR101208133B1 (en) * | 2006-04-26 | 2012-12-04 | 한국전자통신연구원 | Method for paging information in cellular system |
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| EP0048854A1 (en) * | 1980-09-29 | 1982-04-07 | Siemens Aktiengesellschaft | Mobile radio telephone system for digital speech transmission |
| US4887265A (en) * | 1988-03-18 | 1989-12-12 | Motorola, Inc. | Packet-switched cellular telephone system |
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