CN1375955A - Group data transmission method and equipment based on CDMA bandspread technology - Google Patents
Group data transmission method and equipment based on CDMA bandspread technology Download PDFInfo
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Abstract
This invention relates to data transmission device and method used in wideband CDMA composed of two types of packet data transmission equipments: a transceiver of base station and a transceiver of mobile terminal to progress packet data exchanges via the up and downstream channels by the base station and the mobile terminal. In this invention all mobile terminals share a data channel. The base station controls all mobile terminals for the statistical plex to the downstream data channels based on the transmission quantity and service quality of the mobile terminals. The statistic plex of the up data channels are based on the transmission state and service types by each mobile terminal to be real-time allocated dynamically by the base station after unified coordination. The invention is to avoid effectively the waste of the wireless resources brought by the occupation of channels to raise greatly the usage of wireless
Description
Technical field
The present invention relates to a kind of cell mobile communication systems, be specifically related to a kind of data transmission set and method that is used for the Wideband Code Division Multiple Access (WCDMA) cdma communication system.
Background technology
Just before 10 years, wireless communication industry also code division multiple access CDMA as a kind of controversial technology.On the contrary, when the TIA of telecommunications industry federation after issuing the IS-95 standard in 1993, CDMA has become the preferential selection of telecommunications industry rapidly.Up to now, set up thousands of cdma mobile communication net in the whole world, total number of users has surpassed 3,000 ten thousand.The air interface technologies of CDMA as them all selected in a lot of wireless communication technology RTT motions of while IMT-2000 of future generation system.
Typical traditional C DMA system is used for transferring voice.On the contrary, also propose in cdma system, to transmit the signal of other type recently, comprise high-speed data signal.Third generation cdma cellular communication system is commonly called global system for mobile communications UMTS, comprise that Zhang Ping/wait writes WCDMA of introducing among " the third generation cell mobile communication systems-WCDMA " that publishing house of Beijing University of Post ﹠ Telecommunication publishes and Yang Dacheng/wait and writes the CDMA2000 that introduces in " the CDMA2000 technology " that publishing house of Beijing University of Post ﹠ Telecommunication publishes, providing on the basis of traditional voice communication capability, the Packet data service service of two-forty will be provided.
In these cdma systems, transmission of packet data is used following dual mode: the Circuit-switched mode that adopts " 3G TS25.201 3GPP physical layer standard " and " 3GPP2 C.S0002 3GPP2 physical layer standard " to provide distributes that dedicated data channel transmits that grouped data, employing " 3GPP2 C.S0024 3GPP2 high rate packet data air interface standard " provide inserts or a plurality of portable terminals of mode of carrier sense are competed common data channels transmission grouped data at random.The efficient that this dual mode transmits grouped data is all very low.
When adopt distributing dedicated data channel to transmit grouped data, to each portable terminal preassignment Radio Resource all, portable terminal will be monopolized data channel for a long time.The ground yet packet data transmission always happens suddenly only takies the very short cycle, and therefore this transmission means will be wasted the Radio Resource of most of the time.
Adopt and to insert at random or the mode of carrier sense when transmitting grouped data, because base station and do not know the information of portable terminal, portable terminal need be competed public sign indicating number resource, and the transmission grouped data is to the base station.Selected same sign indicating number resource when two portable terminals, both packet count plays will bump.Because the existence of collision, the access efficiency of system is very low.Particularly when the grouped data flow that needs to transmit was very big, the performance of system was understood rapid deterioration, even can't transmit any grouped data and give the base station.
Summary of the invention
The object of the invention is to overcome and adopts circuit exchange mode, inserts or carrier sense mode when carrying out packet data transmission at random, the problem that the wasting of resources that brings and efficiency of transmission are low provides a kind of group data transmission equipment and method thereof based on CDMA bandspread technology.
This method is based on the principle of statistic multiplexing, under the coordination of base station, the grouped data report of a plurality of portable terminals is multiplexed on many common data channels of system and sends.Have only when portable terminal exists grouped data to require to send, the grouped data report that just need take Radio Resource and other portable terminals is multiplexed on the common data channels of system together.When portable terminal does not have grouped data to send, will can not take any Radio Resource.This still takies Radio Resource when portable terminal does not have data for a long time when just having been avoided adopting circuit exchange mode drawback has improved usage factor of system resource.
It is mac-layer address that each portable terminal of while all adopts unique media access control layer, the grouped data report of sign oneself on common data channels.Each portable terminal all is notified to the base station with this MAC Address, and coordinates the data transmission of each portable terminal on common data channels by the base station.Thisly carry out the statistic multiplexing method of real time coordination by the base station, the grouped data of having avoided portable terminal to adopt public sign indicating number resource to be at war with having caused when inserting is collided, thereby has improved transmission efficiency of packet data.
The present invention seeks to realize like this: based on the group data transmission method of CDMA bandspread technology, this communication system is made up of two types group data transmission equipment: base station transceiver and portable terminal transceiver, base station and portable terminal carry out packet data exchanged by up channel and down channel, down channel is by synchronizing channel, downlink pilot frequency channel, power control and Channel Assignment Indication Channel, down control channel, descending PDU transmission channel is formed, up channel is by Random Access Channel, ascending pilot channel, the transmission quality control channel, ascending control channel, up PDU transmission channel is formed, when base station transmits grouping PDU data are given portable terminal, according to the principle of statistic multiplexing, dynamic assignment is given the downstream data channel of each portable terminal; Mobile radio station is by ascending control channel transmitting channel application information, the base station assigns uplink data channels, and sending allocation result to portable terminal by Channel Assignment Indication Channel, portable terminal uses the uplink data channels of distribution to send grouping PDU data to the base station then; Grouped data is divided into a plurality of PDU segments, and all users send the PDU segment on the channel of sharing; Data message uses mac-layer address to carry out user's difference.
The down channel that the base station sends comprises: the base station sends synchronizing channel, is used for portable terminal and carries out Cell searching and switching; The base station sends pilot channel, is used for the tracking of channel estimating and downlink receiver; The base station sends power control and Channel Assignment Indication Channel, is used to control uplink transmit power and indicates the uplink data channels of distributing to each portable terminal; The base station transmits control channel, and is used to transmit control information in real time such as paging and gives portable terminal; The base station sends the PDU segment on the PDU transmission channel, this PDU transmission channel will be shared by all portable terminals, according to the principle of statistic multiplexing, carry out real-time dynamic assignment.
The up channel that mobile radio station sends comprises: use time slot A LOHA algorithm, send SMS message, insert message and other control messages on Random Access Channel; Portable terminal sends pilot channel, is used for the tracking of channel estimating and uplink receiver; Portable terminal sends the transmission quality control channel, is used to control the transmission quality of downstream data channel; Portable terminal transmits control channel, and is used for control information in real time such as transmitting channel application and gives the base station; Portable terminal sends the PDU segment on the PDU transmission channel, this PDU transmission channel carries out real-time dynamic assignment by the base station.
Downstream data channel is carried out the process of statistic multiplexing by all portable terminals, comprise: portable terminal is according to signal to noise ratio measured on downlink pilot frequency channel, calculate the transmission quality control information of downstream data channel, and this transmission quality control information is sent to the base station; The through-put power of each portable terminal downstream data channel is calculated according to the transmission quality control information of receiving in the base station, and gives all portable terminal allocation of downlink data channels; Notify Radio Link access control RLAC layer with allocation result, and on the downstream data channel of having distributed, send the PDU segment by the RLAC layer.
The base station distributes the process of up channel for each portable terminal, comprising: mobile radio station calculates the PDU segment number that will send, and sends the uplink data channels solicitation message to the base station; The PDU segment number of mobile radio station application is refreshed in the base station, and distributes uplink data channels for all portable terminals; Indicate the uplink data channels that has distributed to portable terminal.
Digital signal on all data channels is handled; Use the sub-district to specify scrambler to disturb again to transmission signals, so that distinguish the signal of different districts; Be used to control status of mobile terminal conversion, each portable terminal can be in following three kinds of states: idle condition, compete access state, control access state at random, under different conditions, portable terminal can be changed under different states.
A kind of group data transmission equipment based on CDMA bandspread technology, comprise: base station transceiver, this transceiver function adds up all signals on synchronizing channel, pilot channel, power control and Channel Assignment Indication Channel, control channel and the PDU transmission channel, result after adding up is delivered to that PN disturbs again, behind QPSK modulation and the radio frequency unit, sends; The portable terminal transceiver, this transceiver function is with Random Access Channel, pilot channel, all signals on transmission quality control channel, control channel and the PDU transmission channel add up, and the result after adding up is delivered to that PN disturbs again, behind QPSK modulation and the radio frequency unit, sends.
Because the present invention has realized the up-downgoing data channel and has been shared by all portable terminals, carry out statistic multiplexing in real time, when portable terminal is in idling cycle between bursty data, discharging shared Radio Resource uses for other portable terminal, when portable terminal is in bursty data during the cycle, obtain Radio Resource again and carry out transfer of data.Therefore when just having avoided in the traditional C DMA system distributing the data channel of monopolizing to portable terminal, when portable terminal is in idling cycle between bursty data, still take the drawback of system wireless resource, thereby greatly improved the service efficiency of system wireless resource.Simultaneously the data of mobile radio station send by the base station united and coordinating, have avoided adopting at random access way because the poor efficiency that the grouped data that collision brings transmits.
Description of drawings
Fig. 1 is base station transmitter and portable terminal receiver structure figure.
Fig. 2 is portable terminal transmitter and base station receiver structure chart.
Fig. 3 is the downstream data channel structure chart.
Fig. 4 is the uplink data channels structure chart.
Fig. 5 is the status of mobile terminal transition diagram.
Fig. 6 is the flow chart of operation of downlink grouped data channel allocation and data flow transmission control.
Fig. 7 is the flow chart of multi-user's access procedure.
Fig. 8 is the flow chart of operation of ascending packet data channel allocation and data flow transmission control.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described.
To transmit grouped data in order satisfying in a cdma system, and not take data channel for a long time, additionally increase the demand that whole system is disturbed, a kind of method and apparatus of cdma system is suggested.Each portable terminal has two main states in the present invention: idle condition and state of activation.State of activation can be divided into again competes two sub-states such as access state and control access state at random.Under given conditions, every kind of state can both be transformed into another state.Portable terminal under idle condition only takies channel resource seldom.It is the monitoring broadcast next from the base station only, and this message has public MAC Address and public message-length.In case it has obtained the packet data transmission indication from the application program on upper strata, or from base station acquisition reception indication, portable terminal forwards state of activation to from idle condition.In cycle, portable terminal takies more channel resource in state of activation.But the quantity of the channel resource that portable terminal is shared is not fixed, will be according to delivery flow rate and excited users number dynamic assignment.
The present invention includes following equipment and method:
1) in a cdma system, carries out the base station equipment of packet data transmission
2) in a cdma system, carry out the base station receiver equipment of packet data transmission
3) in a cdma system, carry out the portable terminal transmitter of packet data transmission
4) in a cdma system, carry out the portable terminal receiving equipment of packet data transmission
5) the control mobile terminal state is changed employed method
6) when a large amount of grouped datas when the base station is sent to portable terminal, the employed method of allocation of downlink channel resource
7) when a large amount of grouped datas when a plurality of portable terminals are sent to the base station, distribute the employed method of uplink channel resources
Fig. 1 is corresponding to base station transmitter of the preferred embodiments of the present invention and portable terminal receiver structure figure.Base station 100 by base station controller 101, a plurality of portable terminal 115 (only having drawn among the figure one), a plurality of PDU (Packet Data Unit) transmission channel 107, synchronizing channel 104, pilot channel 105, power control and Channel Assignment Indication Channel 106, control channel 108, PDU buffering area 102, transmission control unit (TCU) circuit 103,2 adders 116, PN disturb 109 again, the sub-district specifies scrambler 110, qpsk modulator 111 and base station radio-frequency unit 112 etc.As shown in the figure, base station 100 communicates by descending communication signal 113 and portable terminal 115, and portable terminal 115 communicates by uplink communication signal 114 and base station 100.Network components in base station 100 will by to the reasonable disposition of processor, internal memory and instruction set to finish above function.
Corresponding to the preferred embodiments of the present invention, synchronizing channel 104 is used for the portable terminal 115 that the transfer system synchronizing information communicates for all and base station 100.Synchronizing information is made up of slot synchronization information and frame synchronization information.
Power control and Channel Assignment Indication Channel 106 are Common Control Channel.This channel has two functions: a function is the control function of power that is similar to existing cdma system, when another function transmits grouped data when portable terminal, is used to notify portable terminal, and which channel resource the base station has distributed to it.
Control channel 108 be used to transmit paging etc. in real time control messages give portable terminal 115.When portable terminal 115 is in idle pulley, base station 100 will send beep-page message to portable terminal 115 by control channel 108, to start the data-transfer process of portable terminal 115.
Data sequence on each channel described above adds up in accumulator 116, disturbs again at PN then and uses the scrambler 110 of a pair of sub-district appointment to carry out spread spectrum in 109, to produce I road and Q path channels spreading code.I road and Q path channels spread spectrum code sequence carry out the QPSK modulation subsequently in modulator 110, these data are launched by base station 112 at last, have finished the transmission course of whole channel data bits.
Fig. 2 is corresponding to portable terminal transmitter of the preferred embodiments of the present invention and base station receiver structure chart.Portable terminal 200 by mobile terminal controller 201, base station 215, a plurality of PDU transmission channel 207, Random Access Channel 204, pilot channel 205, transmission quality control channel 206, control channel 208, PDU buffering area 202, transmission control circuit 203, channel multiplexing 216,2 accumulators 217, PN disturb 209 again, the sub-district specifies scrambler 210, qpsk modulator 211 and radio frequency unit 212 to be formed.Portable terminal 200 is communicated by letter with base station 215 by uplink communication signal 213, communicates by letter with portable terminal 200 by descending communication signal 214 in base station 215.Network components in communication system 200 will be by finishing above function to the reasonable disposition of processor, internal memory and instruction set.
Corresponding to the preferred embodiments of the present invention, Random Access Channel 204 is moved terminal 200 and is used to finish initial communication process with base station 215.Random Access Channel 204 is used random access protocol.
Pilot channel 205 is similar to existing C DMA pilot channel, is used to the transmission that assistant base station 215 detects portable terminal 200.
Transmission quality control channel 206 is used to control the downlink transfer quality of base station 215.Pilot channel 205 and transmission quality control channel 206 carry out time division multiplexing in channel multiplexing 216.Portable terminal transmits the transmission quality control informations by transmission quality control channel 206 and gives the base station by detecting the signal to noise ratio of downstream signal, regulates down transmitting power to each user by the base station, to guarantee each user's downlink transfer quality requirement.
Control channel 208 be used to transfer channel solicitation message etc. in real time control messages give base station 215.When portable terminal 200 needed to transmit grouped data, its transmitting channel resource bid message on control channel was given base station 215, waits for the response of base station 215.
PDU transmission channel 207 is used to realize the communication service with the high speed data rate of base station 215.The data transfer rate of PDU transmission channel is variable.Base station 215 is according to the delivery flow rate and the service priority assignment PDU transmission channel 207 of portable terminal 200.Base station 215 transmission channel assignment messages are given portable terminal 200 on power control and Channel Assignment Indication Channel 106.
The data sequence of each channel described above adds up in accumulator 217, disturbs again at PN then and uses the scrambler 210 of a pair of sub-district appointment to carry out spread spectrum in 209, to produce I road and Q path channels spreading code.I road and Q path channels spread spectrum code sequence carry out the QPSK modulation subsequently in modulator 210, these data are launched by radio frequency unit 212 at last, have finished the transmission course of whole channel data bits.
One has 5 types downstream data channel: synchronizing channel 104, pilot channel 105, power control and Channel Assignment Indication Channel 106, control channel 108 and PDU transmission channel 107.Fig. 3 has shown the channel architecture of these downstream data channel, below we will describe them in detail.
Corresponding to the preferred embodiments of the present invention, portable terminal 115 at first carries out with the strongest base station 100 of received signal power synchronously.For auxiliary moving terminal 115 is carried out synchronously, base station 100 is broadcast synchronization control information continuously on synchronizing channel 104.Corresponding to the preferred embodiments of the present invention, synchronically controlling information is made up of Primary Synchronisation Code and secondary synchronization code.Primary Synchronisation Code is used for slot synchronization, and secondary synchronization code is used for frame synchronization.Synchronizing channel 104 comprises signaling point mapping 301, adder 302, channel gain 303 etc.Signaling point mapping 301 binary sequences with Primary Synchronisation Code and secondary synchronization code are mapped as 1 and-1 binary sequence.This binary sequence carries out addition in adder 302 then.The result of output carries out gain controlling in channel gain 303, so that launch with constant power grade.
Power control and Channel Assignment Indication Channel 106 are public down control channels.Two types control information will be transmitted in base station 100 on this channel.Power control information is used for portable terminal 115 and adjusts its power grade.Channel Assignment Indication Channel is used to notify portable terminal, distributes to the channel resource that they use.All control informations all be do not encode, the signal of spread spectrum.Power control and Channel Assignment Indication Channel 106 comprise piece repetition 305, channel code expansion 304, signaling point mapping 301 and channel gain 303 etc.Piece repeats 305 and is used to provide a fixing transmission rate.The operation principle of channel code expansion 304, signaling point mapping 301 and channel gain 303 is identical with synchronizing channel 104 and pilot channel 105.
Descending PDU transmission channel 107 is a kind of physical channels that transmit grouped data between base station 100 and portable terminal 115.Corresponding to the preferred embodiments of the present invention, on base station 100, have 28 descending PDU transmission channels 107.All portable terminals 115 are shared all these PDU transmission channels 107 on base station 100.The PDU transmission channel number of each portable terminal use will be given according to the delivery flow rate and the COS dynamic assignment of each portable terminal in the base station.PDU transmission channel 107 is formed by increasing frame quality indication 306, increase by 8 bits of encoded tail bits 307, convolution coder 308, symbol repetition 309, block interleaving 310, the channel indication code 311 that increases by 24 bits, long code maker 312, mould 2 accumulators 313, channel code expansion 304, signaling point mapping 301 and channel gain 303 etc.Increase frame quality indication 306 and provide error detection by on each PDU transmission block, increasing Cyclic Redundancy Check.According to the length of PDU, the length of CRC can be selected 32 or 16 bits.Convolution coder 308 uses a kind of encryption algorithm input bit to be encoded to data symbol with fixing code rate.Convolution coder 308 employed encryption algorithms can be realized the decoding of maximum likelihood subsequence in the transfer process of data symbol data bit.Increase by 8 bits of encoded tail bits 307 and be used for before next code period, the state of replacement convolution coder is complete zero.Use the data symbol after symbol repetition 309 will be encoded to carry out repetition then, be input in the block interleaving 310.Block interleaving 310 interweaves to the input data symbol on the symbol rank, and the data symbol after interweaving will be exported with same data symbol rate.In the channel indication code 311 that increases by 24 bits, the head of the data symbol after will interweaving adds the channel indication code of 24 bits.For the randomization data symbol, long code maker 312 has produced the cyclically shifted sequences (becoming the PN sequence sometimes) of a maximum length, carries out mould 2 with the data symbol sequence of this cyclically shifted sequences and input then and adds.Behind data scrambling, data symbol is admitted to channel code expansion 304, signaling point mapping 301 and channel gain 303 successively.
Control channel 108 is used to transmit control information in real time such as paging and gives portable terminal 115.Control channel is formed by increasing frame quality indication 306, increase by 8 bits of encoded tail bits 307, convolution coder 308, block interleaving 310, channel code expansion 304, signaling point mapping 301 and channel gain 303 etc.The operation principle of all these functional blocks is identical with descending PDU transmission channel 107.
As shown in Figure 4, have 5 types uplink data channels: Random Access Channel 204, pilot channel 205, transmission quality control channel 206, control channel 208 and PDU transmission channel 207 etc.
Random Access Channel 204 is moved terminal and is used for communication process between initialization and the base station 215, or the beep-page message of response base station.Random Access Channel is used a kind of random access protocol usually, and transmission is passed through and encoded, interweaves, the signal of spread spectrum.An access sequence is made up of a series of Access Preamble sequence and access message frame thereafter usually.Random Access Channel 204 is made up of convolution coder 401, block interleaving 402, channel code expansion 403, signaling point mapping 404 and channel gain 405 etc.
Pilot channel 205 transmits the not signal of coding, spread spectrum, detects the transmission of portable terminal 200 with assistant base station.When portable terminal transmits data on up channel such as Random Access Channel 204, transmission quality control channel 206, control channel 208 and PDU transmission channel 207, pilot channel 205 also will send simultaneously.Pilot channel 205 comprises channel code expansion 403, signaling point mapping 404 and channel gain 405 etc.
Transmission quality control channel 206 is up control channels, is used for transmitting in real time the transmission quality control information and gives base station 215, to proofread and correct the transmit power level of base station, to guarantee to send to the downlink transfer quality of portable terminal.Transmission quality control channel 206 carries out time division multiplexing with pilot channel 205.Transmission quality control channel 206 is made up of piece repetition 406, channel code expansion 403, signaling point mapping 404 and channel gain 405 etc.
Up PDU transmission channel 207 is used for portable terminal and transmits grouped data report to base station 215.The number of the spendable up PDU transmission channel 207 of portable terminal is notified in the base station in downlink power control and Channel Assignment Indication Channel 106.PDU transmission channel 207 is formed by increasing frame quality indication 407, increase by 8 bits of encoded tail bits 408, convolution coder 401, symbol repetition 409, block interleaving 402, the channel indication code 410 that increases by 24 bits, long code maker 411, mould 2 accumulators 412, channel code expansion 403, signaling point mapping 404 and channel gain 405 etc.All these functional blocks all are similar to descending PDU transmission channel 107.
Control channel 208 be used for transfer channel solicitation message etc. in real time control messages give base station 215.When portable terminal 200 needed to transmit grouped data, its transmitting channel resource bid message on control channel was given base station 215.Control channel is formed by increasing frame quality indication 407, increase by 8 bits of encoded tail bits 408, convolution coder 401, block interleaving 402, channel code expansion 403, signaling point mapping 404 and channel gain 405 etc.
Corresponding to the preferred embodiments of the present invention, portable terminal comprises following main state: idle condition 503, compete at random access state 504, control access state 505 etc.Fig. 5 is corresponding to the preferred embodiments of the present invention, the status of mobile terminal transition diagram.
Behind the mobile terminal-opening, after having obtained start indication 501, will enter initialize process 502.
In initialize process 502, portable terminal 200 is at first attempted the pilot channel 105 of search base station 100.If portable terminal has been caught pilot channel 105, it will receive and handle message on the synchronizing channel 104, to obtain system configuration and timing information.When portable terminal 200 on Random Access Channel, finished with the initialization registration of base station 100, Location Registration, authentication after, will change idle condition 503 over to.
In idle condition 503, portable terminal does not receive any grouped data from descending PDU transmission channel 107, and only monitors downlink pilot frequency channel 105 and down control channel 108, so that 100 obtain broadcast messages from the base station.Under this state, base station 100 does not have PPP to be connected with portable terminal 200, but base station 100 will keep registration, position and the state information of portable terminal 200.Portable terminal 200 can receive the calling (ending at the calling of portable terminal) of input and make a call (originating in the calling of portable terminal).When portable terminal 200 was initiated an access request or received a descending beep-page message, portable terminal will enter competed access state 504 at random.
Enter compete at random access state 504 after, one of portable terminal 200 initialization are access state timer TRA at random.In competing at random access state 504, base station 100 will keep being connected with the PPP of portable terminal 200.Portable terminal 200 can send message to base station 100 on Random Access Channel 204, receive the information on the downlink pilot frequency channel 105, down control channel 108, descending PDU transmission channel 107 of base station 100 simultaneously.Under this state, base station 100 will continue to monitor the position and the state information of portable terminal 200.The transfer of data of timer TRA monitoring portable terminal 200, when portable terminal 200 transmits, this timer all will be reset.If timer TRA is overtime, portable terminal 200 has not had data to transmit, and portable terminal 200 will discharge shared Radio Resource, return idle condition 503.After portable terminal 200 receives high-rise state exchange control signaling, will be to base station 100 transmit status conversion request message on Random Access Channel 204.If portable terminal 200 receives the state exchange response message of base station 100, portable terminal 200 will set up that data are connected with control logic, physical connection, and enter control access state 505.
At control access state 505, portable terminal 200 will communicate with base station 100 by up PDU transmission channel 207 and descending PDU transmission channel 107.When the each transmitting grouped data of portable terminal 200, all with replacement control timer TCA.If this timer expiry, portable terminal 200 have not had data to transmit, portable terminal 200 will return competes access state 504 at random.
Be in which state no matter portable terminal 200 is current,, all will call shutdown process 506 in case it receives shutdown message.
Fig. 6 is corresponding to the preferred embodiments of the present invention, the flow chart of operation of downlink grouped data channel allocation and data flow transmission control.Corresponding to the preferred embodiments of the present invention, base station 100 and portable terminal 200 will carry out the closed loop data flow con-trol.Logic flow will be from step 601.In this step, portable terminal 200 is 100 downlink data receivings from the base station, measure the signal to noise ratio of downlink pilot frequency channel.According to the signal to noise ratio of measuring, portable terminal will calculate a parameter, be used to assess the transmission quality of downstream data channel.Corresponding to the preferred embodiments of the present invention, this parameter is called as transmission quality control indication information.Portable terminal 200 on uplink quality control channel 206, transmits this transmission quality control indication information and gives base station 100 then.In step 602, base station 100 receives transmission quality control indication information, and according to the transmission quality control indication information of receiving, calculates the through-put power of the downstream data channel of each portable terminal 200.In step 603, the sum of downstream data channel will be calculated according to the total through-put power threshold value of through-put power and base station of each data channel in the base station.In step 604, base station 100 will be all portable terminal 200 allocation of downlink data channels, and notice RLAC (Radio Link control) layer.Then, in step 605, on the downstream data channel that base station 100 will have been distributed, send the PDU segment in step 604 to portable terminal 200.In step 606, portable terminal will receive the PDU segment of giving oneself according to MAC (medium access control) address on downstream data channel.In having finished above process, logic flow will come back to step 601, carry out data flow con-trol process next time.
Fig. 7 is corresponding to the preferred embodiments of the present invention, the flow chart of multi-user's access procedure.
As discussed above, portable terminal 200 will carry out random access procedure on Random Access Channel 204.Insert logic flow at random and start from step 701, in this step, portable terminal 200 receives one from high level and inserts request, the beginning access attempts.In step 702, when access parameter ACCESS_NUM (current access total degree) greater than the maximum number of times that inserts of system, then portable terminal 200 does not respond the request of access, the random access procedure failure enters step 710.Detect access parameter ACCESS_NUM (current access total degree) in step 702 else and if be not more than the maximum number of times that inserts of system, then logic flow changes step 703 over to, and in this step, portable terminal 200 will be selected an Access Preamble and access slot at random.At next procedure 704, the access slot that portable terminal 200 will have been selected on Random Access Channel 204, the Access Preamble that transmission has been selected is to base station 100.If in step 705, portable terminal 200 does not receive the Access Preamble response message, and logic flow will return step 702, otherwise logic flow will enter step 706.In step 706, portable terminal will be selected a collision detection prefix and another access slot at random.In step 707, the access slot that portable terminal 200 will have been selected on Random Access Channel 204 sends the collision detection prefix of having selected, waits for the response message of base station 100.If in step 708, portable terminal 200 does not receive the reception of collision detection prefix and replys, and logic flow will return step 702.Otherwise will change step 709 over to, in this step, portable terminal 200 will transmit and insert message and give portable terminal 200, this means that random access procedure finishes, enter step 710.
Fig. 8 is corresponding to the preferred embodiments of the present invention, the flow chart of operation of ascending packet data channel allocation and data flow transmission control.Logic flow originates in 801.Portable terminal 200 at first calculates the PDU segment sum that need send to base station 100, sends the up channel solicitation message then to base station 100 on ascending control channel 208.In step 802, after base station 100 receives solicitation message from portable terminal 200, will refresh the PDU segment number of portable terminal application.Then in step 803, base station 100 will distribute uplink data channels for all portable terminals according to the Radio Resource that can use, flow of services and type.After uplink data channels was distributed to portable terminal in base station 100, it will be on downlink power control and Channel Assignment Indication Channel 106, and transmitting channel distributes Indication message to give portable terminal 200.In step 804, portable terminal 200 receives the channel allocation Indication message, will send the PDU segment to base station 100 on the uplink data channels that this Indication message distributed.
In conjunction with the preferred embodiments the present invention is illustrated that below should point out, those skilled in the art can make the change on various forms and the details, and do not depart from by the determined the spirit and scope of the present invention of claims.
Claims (7)
1, a kind of group data transmission method based on CDMA bandspread technology, this communication system is made up of two types group data transmission equipment: base station transceiver and portable terminal transceiver, base station and portable terminal carry out packet data exchanged by up channel and down channel, down channel is by synchronizing channel, downlink pilot frequency channel, power control and Channel Assignment Indication Channel, down control channel, descending PDU transmission channel is formed, up channel is by Random Access Channel, ascending pilot channel, the transmission quality control channel, ascending control channel, up PDU transmission channel is formed, when base station transmits grouping PDU data are given portable terminal, according to the principle of statistic multiplexing, dynamic assignment is given the downstream data channel of each portable terminal; Mobile radio station is by ascending control channel transmitting channel application information, the base station assigns uplink data channels, and sending allocation result to portable terminal by Channel Assignment Indication Channel, portable terminal uses the uplink data channels of distribution to send grouping PDU data to the base station then; Grouped data is divided into a plurality of PDU segments, and all users send the PDU segment on the channel of sharing; Data message uses mac-layer address to carry out user's difference.
2, group data transmission method according to claim 1, the down channel that the base station sends comprises: the base station sends synchronizing channel, is used for portable terminal and carries out Cell searching and switching; The base station sends pilot channel, is used for the tracking of channel estimating and downlink receiver; The base station sends power control and Channel Assignment Indication Channel, is used to control uplink transmit power and indicates the uplink data channels of distributing to each portable terminal; The base station transmits control channel, and is used to transmit control information in real time such as paging and gives portable terminal; The base station sends the PDU segment on the PDU transmission channel, this PDU transmission channel will be shared by all portable terminals, according to the principle of statistic multiplexing, carry out real-time dynamic assignment.
3, the described group data transmission method of claim 1, the up channel that mobile radio station sends comprises: use time slot A LOHA algorithm, send SMS message, insert message and other control messages on Random Access Channel; Portable terminal sends pilot channel, is used for the tracking of channel estimating and uplink receiver; Portable terminal sends the transmission quality control channel, is used to control the transmission quality of downstream data channel; Portable terminal transmits control channel, and is used for control information in real time such as transmitting channel application and gives the base station; Portable terminal sends the PDU segment on the PDU transmission channel, this PDU transmission channel carries out real-time dynamic assignment by the base station.
4, group data transmission method according to claim 1, downstream data channel is carried out the process of statistic multiplexing by all portable terminals, comprising:
Portable terminal calculates the transmission quality control information of downstream data channel according to signal to noise ratio measured on downlink pilot frequency channel, and this transmission quality control information is sent to the base station;
The through-put power of each portable terminal downstream data channel is calculated according to the transmission quality control information of receiving in the base station, and gives all portable terminal allocation of downlink data channels;
Notify Radio Link access control RLAC layer with allocation result, and on the downstream data channel of having distributed, send the PDU segment by the RLAC layer.
5, according to the described group data transmission method of claim 1, the base station distributes the process of up channel for each portable terminal, comprising:
Mobile radio station calculates the PDU segment number that will send, and sends the uplink data channels solicitation message to the base station;
The PDU segment number of mobile radio station application is refreshed in the base station, and distributes uplink data channels for all portable terminals;
Indicate the uplink data channels that has distributed to portable terminal.
6, group data transmission method according to claim 1 is characterized in that:
Digital signal on all data channels is handled;
Use the sub-district to specify scrambler to disturb again to transmission signals, so that distinguish the signal of different districts;
Be used to control status of mobile terminal conversion, each portable terminal can be in following three kinds of states: idle condition, compete access state, control access state at random, under different conditions, portable terminal can be changed under different states.
7, a kind of group data transmission equipment based on CDMA bandspread technology comprises:
Base station transceiver, this transceiver function adds up all signals on synchronizing channel, pilot channel, power control and Channel Assignment Indication Channel, control channel and the PDU transmission channel, result after adding up is delivered to that PN disturbs again, behind QPSK modulation and the radio frequency unit, sends;
The portable terminal transceiver, this transceiver function is with Random Access Channel, pilot channel, all signals on transmission quality control channel, control channel and the PDU transmission channel add up, and the result after adding up is delivered to that PN disturbs again, behind QPSK modulation and the radio frequency unit, sends.
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| CNB021157812A CN1205823C (en) | 2002-04-28 | 2002-04-28 | Group data transmission method and equipment based on CDMA bandspread technology |
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| CNB021157812A CN1205823C (en) | 2002-04-28 | 2002-04-28 | Group data transmission method and equipment based on CDMA bandspread technology |
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| CN1205823C CN1205823C (en) | 2005-06-08 |
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