WO2005008946A1 - 基地局装置及び送信方法 - Google Patents
基地局装置及び送信方法 Download PDFInfo
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- WO2005008946A1 WO2005008946A1 PCT/JP2004/010240 JP2004010240W WO2005008946A1 WO 2005008946 A1 WO2005008946 A1 WO 2005008946A1 JP 2004010240 W JP2004010240 W JP 2004010240W WO 2005008946 A1 WO2005008946 A1 WO 2005008946A1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/1874—Buffer management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
Definitions
- the present invention relates to a base station procedure and a transmission method, and more particularly to a base station apparatus and a transmission method using an automatic retransmission request scheme for recovering packet loss in a wireless section by retransmission of a bucket.
- the mobile communication system 10 includes: a mobile terminal 1 1; a base station apparatus 12; a radio network control apparatus 13 for controlling a plurality of base station apparatuses 12; It consists of a core network 14 that performs call connection control and the like.
- HSDP High Speed Downlink Packet Access
- HSDPA is a new technology that is being standardized in 3 GPP, and adaptive modulation scheme, hybrid ARQ (HA RQ) scheme, high-speed selection of communication destination users, and transmission parameters adaptively according to radio link conditions.
- HA RQ hybrid ARQ
- HSDPA is a scheme in which one radio channel is shared by a plurality of mobile terminals 11 to perform data transfer, and is a best-effort type communication mode.
- the mobile terminal 1 1 reports the channel status of the downlink radio channel to the base station 12, and the base station 12 schedules the transmission order of data to the plurality of mobile terminals 1 1.
- Figure 2 shows the protocol configuration of the user plane when HS DP A is applied. It is implemented in mobile terminal 11 and base station 12, after processing such as HARQ method and scheduling is performed until the medium access control used high speed (MAC) f.
- RLC Radio Link Control
- RLC Radio Link Control
- HS High Speed Downlink Shared Channel Frame Protocol
- the radio network control device 13 notifies the base station device 12 of the CAPACITY REQUEST message in which the bucket amount to be sent is set, and the base station device 12 sets the CAPACITY ALLOCATION message in which the bucket amount to permit transmission is set. It notifies the radio network controller 13.
- the base station apparatus 12 notifies the wireless network control apparatus 13 of the CAPACITY ALLOCATION message without receiving the CAPACITY REQUEST message from the wireless network control apparatus 13 based on the buffer usage of the own node or the like. It is also possible to control the amount of transmission packets of 13 units of network controller without a spring.
- FIG. 3 is a sequence diagram showing the operation of the mobile communication system 10.
- the new AMD-PDU Allowing transmission Transmit a CAPACITY ALLOCATION message to the radio network controller 13 (step ST 21).
- the RLC processing unit of the radio network controller 1 3 When receiving the CAPACITY ALLOCATION message, the RLC processing unit of the radio network controller 1 3 sends the AMD-FDU 0 to the base station 12. Send -127 (step ST22).
- the AMD-PDUs 0 to 127 transmitted from the R L C processing unit of the radio network control device 13 are accumulated in a buffer in the MAC-h s processing unit of the base station device 12. Thereafter, the AMD-PDUs accumulated in the buffer of the base station apparatus 12 are sequentially transmitted to the mobile terminal 11 according to the scheduling in the MAC-hs processing unit. At this time, it is assumed that AMD-KDU0 is discarded due to an error in the radio section (step ST 23).
- the RLC processing unit of the mobile terminal 1 1 When receiving the next AMD-EDU1 (step ST 24), the RLC processing unit of the mobile terminal 1 1 detects the discard of AMD-PDU 0 from the sequence number set in the AMD-PDU. After that, the RLC processing unit of the mobile terminal 11 transmits STATUS-FDUO, which requests retransmission of the AMD-PDU 0, to the R L C processing unit of the radio network controller 13 (step ST25).
- the mobile terminal 11 activates imer_Status_Prohibit to suppress the transmission interval of STATUS-PDU.
- retransmits AMD-EDU 0 to the base station apparatus 12 (step ST 26).
- AMD-PDU 0 is stored in the buffer in the MAC-hs processing unit of the base station apparatus 12, the AMD-PDU 1 to 127 stored in advance are not transmitted.
- the radio network of the STATUS-PDU 1 requests re-transmission of the AMD-PDU 0 again. Transmit to the RLC processor of the controller 13 (step ST 28).
- the RLC processing unit of the mobile terminal 11 does not receive the retransmitted AMD-PDU 0 even though the Timer-Status JProhibit has expired, so it requests the re-transmission of the AMD-PDU 0 again. It transmits to the RLC processing unit of the apparatus 13 (step ST31).
- step ST 25 to step ST 30 are repeated in the same manner.
- the RLC processing unit of Radio Network Controller 13 forces VT (DAT) up every time it receives STATUS-PDU requesting retransmission of the same AMD-PDU 0, and the value of VT (DAT) reaches MaxDAT.
- the reset procedure of the RLC protocol is activated to transmit RESET-FDU to the base station apparatus 12 (step ST32).
- the RLC protocols of the mobile terminal 11 and the radio network controller 13 are initialized, and all data stored in the RLC processing unit is discarded. Furthermore, if the EESET-PDU transmitted by the RLC processing unit of the radio network control apparatus 13 does not immediately reach the RLC processing unit of the mobile terminal 11 due to the delay in the buffer in the MA ch s, wireless network control The RLC processing unit of the apparatus 13 retransmits the RESET-PDU every time the Timer-RST expires (step ST33, step ST34).
- the RLC processing unit of the radio network controller 13 forces up the VTCRST every time it transmits RESET-EDU, and when the value of VT (RST) reaches MaxRST, determines that the radio link is abnormal and determines the event. It notifies RRC (Radio Resource Control) processing unit. Then, the RRC processing unit activates a disconnection procedure of the radio channel used by the corresponding mobile terminal 11.
- RRC Radio Resource Control
- the base station apparatus When transmission between the base station apparatus and the mobile terminal is performed, for example, in the best effort mode, when the transmission data rate becomes low, a large number of AMD-PDUs are stored in the buffer in the MAC-hs processing unit of the base station apparatus. Because the buffer is accumulated, the AMD-PDU is discarded due to the buffer overflow. Also, AMD-PDUs may be discarded due to transmission errors between the base station and mobile terminals. If the AMD-PDU is discarded, the discarded AMD-PDU is retransmitted between the RLC processing unit of the radio network controller and the RLC processing unit of the mobile terminal, but in the buffer in the MA C-hs processing unit.
- the R L C processing unit of the radio network controller has a problem that throughput is reduced by repeatedly retransmitting the same AMD-PDU.
- the RLC processing unit of the mobile terminal discards all the held data and holds the RLC processing unit of the radio network controller as well. Since all existing data is discarded, there is a problem that communication interruption occurs.
- the RRC processing unit is notified by the notification from the RLC processing unit. Since the procedure for disconnecting the radio channel used by the mobile terminal is activated, the radio channel used by the mobile terminal is disconnected, and the mobile terminal can not receive the used service. . Disclosure of the invention
- the transmission packet data requested to be retransmitted and retransmission are based on the reception quality information (CQI (Channel Quality of Indicator)) of the communication terminal included in the reception signal.
- CQI Channel Quality of Indicator
- Fig. 1 is a diagram showing an entire conventional communication system
- Fig. 2 is a diagram showing the conventional construction of Toconore.
- FIG. 3 is a sequence diagram showing the operation of the conventional communication system
- FIG. 4 is a block diagram showing a configuration of a base station apparatus according to Embodiment 1 of the present invention
- FIG. 5 is a block diagram showing a configuration of a communication terminal apparatus according to Embodiment 1 of the present invention
- FIG. 7 is a block diagram showing the configuration of the RLC processing unit according to Embodiment 1 of the present invention
- FIG. 8 is a reference table showing the relationship between the CQI and the receivable data amount according to Embodiment 1 of the present invention.
- FIG. 9 is a protocol block diagram according to the first embodiment of the present invention.
- FIG. 10 is a sequence diagram showing the operation of the communication system according to Embodiment 1 of the present invention.
- Fig. 11 shows the configuration of the HS-DSCH / FP processing unit according to the second embodiment of the present invention.
- FIG. 12 is a block diagram showing a configuration of a base station apparatus according to Embodiment 3 of the present invention.
- FIG. 13 is a sequence diagram showing an operation of a communication system according to Embodiment 3 of the present invention.
- FIG. 4 is a block diagram showing a configuration of base station apparatus 100 according to Embodiment 1 of the present invention.
- the MAC-hs processing unit 1 0 9 comprises a C Q I extraction unit 1 0 3, a scheduler 1 0 4 and a buffer 1 0 7.
- the wireless layer 1 processing unit 102 performs wireless signal processing on the received signal received by the antenna 101, and then the CQI extraction unit 103 and a medium access control used for dedicated (MA Cd) processing unit 10 5 Output to Also, the wireless layer 1 processing unit 102 wirelessly processes the scheduling information input from the scheduler 1 104 and transmits it from the antenna 1 0 1 and also transmits high speed packet communication input from the buffer 1 0 7 Data is wirelessly processed and transmitted from antenna 1 0 1.
- CQI extraction section 103 extracts CQI, which is reception quality information contained in the received signal inputted from radio layer 1 processing section 102, and scheduler 1 104 and HS 1 DSC HZ FP processing section 1 0 8 Output to Here, CQI is reception quality information of the communication terminal apparatus, and is transmitted from the communication terminal apparatus to the base station apparatus.
- a scheduler which is a transmission means, has a reference table for storing modulation scheme information in which a modulation scheme such as 16 Q AM and the CQI are associated, a coding rate, and CQI And a reference table for storing coding rate information associated with.
- the reference table for storing the modulation scheme information and the reference table for storing the modulation scheme information are the same for the communication terminal apparatus and the base station apparatus.
- the scheduler 104 determines transmission parameters such as a modulation scheme and a coding rate by referring to the reference table using CQ I input from the CQ I extraction unit 103, and determines a predetermined time. Decide which communication terminal to send bucketed data in units (generally called “scheduling”).
- the scheduler 1 outputs scheduling information such as transmission parameters determined in this manner to the buffer 107 and the radio layer 1 processing unit 102.
- the MAC-d processing unit 105 performs MAC-d processing on the received signal input from the wireless layer 1 processing unit 102, and outputs the received signal to the RLC processing unit 106. Further, it performs MAC-d processing on the transmission packet data input from the RLC processing unit 106, adds a MAC_d header, and outputs it to the buffer 107.
- the details of MAC-d processing are described in 3GFP, TS 25.321 Medium Access Control (MAC) protocol specification, V3.14.0.
- the RLC processing unit 106 which is a retransmission control means, performs RLC processing on the received signal input from the MA C d processing unit 105 and outputs it to the radio network controller (RNC). Further, the processing control unit 106 has a function of performing retransmission control of data based on the selective retransmission type retransmission control protocol, and performs RLC processing in response to the retransmission request of the communication terminal device included in the received signal. .
- the RLC processing of the selective retransmission type retransmission control protocol performed by the RLC processing unit 106 based on the ACK or NACK (Negative ACKnowledgement: negative acknowledgment) notified from the communication terminal apparatus, out of the transmitted packet data is NACK Select the bucketed data (retransmission and packet data sent) notified. Then, the 1) ⁇ ⁇ processing unit 106 selects the transmitted bucket selected based on the transmission bucket data amount information that can be newly stored in the buffer 107, which has been input from the HS-D 3 0 ⁇ 17? Processing unit 108. Data and transmission packet data newly input from the radio network controller (RNC) And is output to the MAC-d processing unit 105 at a predetermined transfer rate.
- RNC radio network controller
- the buffer 107 which is an accumulation unit, temporarily accumulates transmission packet data input from the MAC-d processing unit 105, and the transmission packet data of timing and data amount according to the result of scheduling by the scheduler unit 104 is performed. , Output to the wireless layer 1 processing unit 102.
- upper and lower threshold values to be compared with the accumulated data amount of the transmission bucket data are set, and the accumulated data amount and the upper threshold value or the accumulated data amount and the lower limit threshold are set. Value comparison The result is output to the HS-DSCHZFP processing unit 108 as accumulated data amount information.
- the HS-DS CH / FP processing unit 108 which is a data amount control means, extracts the TFRI (Transport-format and Resource reiatea Iniormation), which is information on resource allocation, from the CQ I input from the CQ I extraction unit 103, The amount of data that can be received by the communication terminal device is detected.
- the HS-DSCH / FP processing unit 108 sends a transmission resume message or a transmission stop message based on the comparison result of the accumulated data amount and the upper threshold or the accumulated data amount and the lower threshold input from the buffer 107. Are output to the RLC processing unit 106.
- Processing unit 108 determines the amount of accumulated data of transmission packet data accumulated in the buffer 107 input from the buffer 107 and the amount of data that can be received by the communication terminal apparatus.
- the transmission packet data amount (multiplexed data amount) to be newly stored in the buffer 107 is determined, and the determined transmission packet data amount information is output to the RLC processor 106 together with a transmission restart message.
- HS-DS ⁇ 1 /? Details of the processing unit 108 will be described later.
- FIG. 5 is a block diagram showing a configuration of communication terminal apparatus 200 which is a communication partner of base station apparatus 100 according to the first embodiment of the present invention.
- the wireless layer 1 processing unit 202 wirelessly processes the received signal received by the antenna 201 and outputs the processed signal to the MAC_hs processing unit 203. Further, the wireless layer 1 processing unit 202 wirelessly processes a transmission signal including the CQ I and the retransmission request signal and the like input from the MAC-d processing unit 204, and transmits the signal from the antenna 201.
- the MAC-hs processing unit 203 performs MAC-hs processing on the received signal input from the wireless layer 1 processing unit 202. That is, the MAC-hs processing unit 203 extracts the scheduling information received from the base station apparatus, and instructs the MAC-d processing unit 204 to transmit data according to the extracted scheduling information.
- the MAC processing unit 204 performs MAC-d processing on the received signal input from the MAC processing unit 203, and outputs the received signal to the RLC processing unit 205. Further, it performs MAC-d processing on the transmission signal input from the RLC processing unit 205, adds a MAC-d header, and outputs the result to the radio layer 1 processing unit 202.
- the RLC processing unit 205 has a function of performing retransmission control of data based on a retransmission control protocol, performs RLC processing on the received signal input from the MAC-d processing unit, and determines whether packet data requested for retransmission has been received. Determine Then, the RLC processing unit 205 outputs a retransmission request signal to the MAC_d processing unit 204 until the bucketed data requested to be retransmitted is received.
- FIG. 7 is a block diagram showing the configuration of a processing unit 108.
- the CQ I reference unit 301 stores the same receivable data amount information (reception quality information) as that of the communication terminal device that associates the CQ I with the data amount receivable by the communication terminal device in the reference table.
- ⁇ 31 reference unit 301 can receive the amount of receivable data by referring to the reference table ⁇ / re using CQ I input from CQ I extraction unit 103 (TFRI) can be recognized. Then, CQI reference section 301 outputs the recognized receivable data amount information to comparison control section 302.
- the comparison control unit 302 sets the value indicating the transmission stop when the accumulated data amount information that the accumulated data amount has reached the upper threshold or more is input from the buffer 107.
- CAPACITY ALLOCATION When a message is output to RLC processor 106 and stored data amount information indicating that the stored data amount (queue length) is less than or equal to the lower threshold is input from buffer 107, this indicates transmission resumption. Outputs the CAPACITY ALLOCATION message for which the value has been set to the RLC processor. Then, when the accumulated data amount information that the accumulated data amount has become equal to or less than the lower limit threshold value is inputted from the buffer 107, the comparison control unit 302 is inputted from the CQI reference unit 300.
- the transmission packet data amount to be newly accumulated in the buffer 107 is determined so that the accumulated data amount in the buffer 107 becomes equal to or less than the receivable data amount. Then, the comparison control unit 302 outputs the obtained transmission packet data amount information to the R L C processing unit 106 together with a CAPACITY ALLOCATION message in which a value indicating transmission resumption is set.
- FIG. 7 is a block diagram showing the configuration of the 1 1 ⁇ processing unit 106.
- the separating unit 4-1 When the reception signal input from the MAC-d processing unit 105 includes the retransmission request signal N A C K, the separating unit 4-1 outputs the received signal to the buffer 402. Further, demultiplexing section 401 outputs a signal other than the retransmission request signal to a radio network controller (RNC) not shown.
- RNC radio network controller
- the buffer 402 accumulates new transmission packet data input from the radio network controller (RNC) until a predetermined time elapses. Then, when the buffer 402 receives the notification of the NACK from the separating unit 401, the buffer 402 transmits the transmitted packet data notified of the NACK from among the transmitted transmitted packet data stored therein. , It selects as transmission bucket data for which retransmission has been requested and outputs it to the multiplex control unit 403. Also, the buffer 402 is notified of the separation section 4 0 1 to the NA CK. If the predetermined time has passed without receiving the request, discard the stored transmission bucket data.
- RNC radio network controller
- the multiplexing control unit 403 which is a multiplexing means, transmits the new transmission packet data input from the radio network controller (RNC) and the retransmission packet data requested to be retransmitted from the buffer 402 to the HS-DSCH / FP processing unit. Multiplex according to the control of 108. That is, multiplex control section 403 preferentially multiplexes transmission packet data requested for retransmission, and the amount of data after multiplexing transmission packet data requested for retransmission is HS-DS CHZF P processing section 10 If it is less than the amount of transmission packet data instructed by step 8, new transmission packet data is multiplexed to the transmission packet data requested to be retransmitted.
- RNC radio network controller
- multiplex control section 403 when there is no request for retransmission from the communication terminal apparatus, multiplex control section 403 only sends the amount of transmission packet data instructed by HS-DS CH / FP processing section 1 0 8 to only new transmission packet data. Only multiplex. Then, the multiplexing control unit 403 outputs the multiplexed transmission packet data to the MAC-d processing unit 105.
- transmission bucket data requested to be retransmitted is preferentially multiplexed.
- the present invention is not limited to this. If it is requested to send a new data, it may be possible to multiplex new transmission bucket data preferentially, or by multiplexing new transmission bucket data with transmission bucket data requested to be retransmitted. The degree can be decided arbitrarily.
- FIG. 8 shows a reference table storing the receivable data amount information in which the CQ I is associated with the receivable data amount information.
- the receivable data amount is 100 bit Z sec, and in the case of CQ I power S “2”, the receivable data amount is 200 bit / sec. In the case of the CQI strength S “3”, the receivable data amount is 300 bits / sec. Note that the relationship between CQ I and the receivable data amount is the same as the propagation ring at that time, as long as the base station device and the communication terminal device hold the same receivable data amount information. It can be changed arbitrarily according to the environment.
- FIG. 9 is a configuration diagram of a user plane in the communication system of this research.
- MAC-d and RLC are arranged in the base station apparatus, which is different from the conventional FIG.
- FIG. 10 is an operation sequence diagram showing an operation of a communication system which performs communication using base station apparatus 100, communication terminal apparatus 200 and the like.
- the buffer 107 of the base station apparatus and the R L C processing unit 106 are provided in the same base station apparatus 100.
- the HS-DS CHZF P processor 1 08 of the base station apparatus 100 sets the amount of data accumulated in the buffer 1 0 7 of the MAC 1 hs processor 1 0 9 to the lower threshold ( If it is confirmed that the number of AMD-PDUs is less than or equal to 0), a Capacity Allocation message permitting transmission of a new AMD-PDU is output to the RLC processing unit 106 (step ST 70 1).
- the Capacity AUocation message indicates the number of AMD-PDUs permitted to be transmitted at each transmission cycle T of a predetermined radio channel.
- the maximum number of AMD-PDUs that can be sent in one transmission cycle T of wireless communication is four.
- the maximum number of AMD-PDUs that can be sent in one transmission cycle T is not limited to 4 and can be set to any number.
- the 100 processing unit 106 of the base station 100 notified of the number of AMD-PDUs that may be newly transmitted outputs the four AMD-EDUs 0 to 3 to the buffer 1 0 7 (step ST 70) 2).
- the HS-DSCH / FP processor 108 stops transmission to the RLC processor 106. To direct.
- the MA C-hs processing unit 109 takes out the AMD-RDUs 0 to 3 from the dispatcher 107 and transmits them to the communication terminal 200 (step ST 703).
- the R L C processing section 205 of the communication terminal apparatus 200 transmits a STATUS-PDU 0 in which a request to retransmit the discarded AMD-PDU 0 is set to the R L C processing section 106 of the base station apparatus 400 (step ST 704).
- the RLC processing unit 106 does not transmit the AMD-PDU 0 requested to be retransmitted because the RLC processing unit 106 has not obtained the transmission permission of the new AMD-EDU.
- HS-DSCH / FP processing section 108 of base station apparatus 100 takes account of the amount of data that can be received by communication terminal apparatus 200.
- the transmission of two AMD-PDUs is newly permitted to the processing unit 106 (step ST 705).
- RLC processing section 106 notified of the number of AMD-PDUs that may be newly transmitted transmits AMD-PDU 0 for which retransmission is requested and another AMD-PDU 4 to buffer 10 7 (step ST 706). ).
- the MAC-hs processing unit 109 extracts AMD-FDU0 and AMD-PDU4 from the buffer 107 and transmits them to the communication terminal apparatus 200 (step ST 707). As a result, retransmission of AMD-PDU0 discarded on the wireless channel is completed.
- the number of AMD-FDUs determined to be newly transmitted by the HS-DSCHZF P processing unit 108 of the base station apparatus 100 and the number of AMD-PDUs actually transmitted to the radio channel are determined. Will be described.
- the HS-DSCHZFP processing unit 108 of the base station apparatus 100 considers the receivable data amount of the communication terminal apparatus 200 for the processing unit 106. Allow four additional AMD-PDUs to be sent (step ST 708).
- the HS— DSC The H / FP processing unit 108 instructs the RLC processing unit 106 to stop transmission.
- the RLC processing unit 106 notified of the number of AMD-PDUs that may be newly transmitted outputs the new AMD-PDUs 5 to 8 to the buffer 107 (step ST 70 9).
- the MAC-hs processing unit 109 can not transmit even one AMD-PDU because of an increase in the amount of communication of another user, a deterioration in the wireless channel state, etc. Accumulate four.
- the HS-DS CH / FP processing unit 108 already sends out to the buffer 107 at the transmission cycle of the wireless channel even if it receives CQ I that can newly permit transmission of four AMD-FDUs from the MAC_h s processing unit 109.
- Outputs to the RLC processing unit 106 a message that the RLC processing unit 106 is not permitted to transmit a new AMD-PDU because it stores AMD-FDUs that are higher than the upper threshold, which is a possible AMD-PDU. Do (step ST710).
- the MAC-hs processing unit 109 takes out the AMD-PDU 5-8 already stored in the buffer 107 and transmits it to the communication terminal 200 (step ST711). As a result, all the AMD-PDUs stored in the buffer 107 are transmitted, and the number of AMD-PDUs stored in the buffer 107 falls below the lower threshold. After that, the operations of step ST 701 to step ST 711 are repeated.
- the lower and upper thresholds of the buffer 107 are not limited to 0 for the number of AMD-FDU and 4 for the number of AMD-PDU, and can be set arbitrarily.
- the base station apparatus controls the number of AMD-FDUs stored in the buffer by the HS-DSCH / FP processing unit, and can not transmit due to deterioration of the radio channel state or the like.
- AMD-PDU is stored in the buffer
- the storage of new transmission packet data for which retransmission is not requested is limited in the buffer, and transmission bucketed data for which retransmission is requested is preferentially stored in the buffer.
- the number of retransmission requests can be reduced, and Communication can be improved, and interruption of communication and disconnection of lines can be prevented.
- the amount of data stored in the buffer can be controlled quickly. can do. Further, according to the first embodiment, even when retransmission is not requested, the amount of data stored in the buffer of the new transmission packet data can be controlled, so that the transmission rate is lowered due to deterioration of the radio channel or the like. In some cases, it is possible to prevent transmission packet data from overflowing from the buffer and being discarded.
- FIG. 11 is a block diagram showing the configuration of an H S-D S C HZ F P processing section 108 of the base station apparatus according to Embodiment 2 of the present invention.
- the configurations of the base station device and the communication terminal device are ⁇ 1-03. ⁇ [? The configuration is the same as that of FIGS. 4 and 5 except that the threshold information is input to the processing unit 108, and thus the description thereof is omitted.
- the CQI reference section 801 stores the same transmission data rate information (reception quality information) as that of the communication terminal apparatus in which the CQI is associated with the transmission data rate in the reference table.
- the reference data section 801 can detect the transmission data rate (T F R I) by referring to the reference table using the C Q I input from the C Q I extraction section 1303. Then, the reference section 801 outputs the detected transmission data rate information to the queuing delay calculation section 802.
- the queuing delay calculation unit 8002 is based on the transmission data rate information inputted from the CQI reference unit 801 and the accumulated data amount information of the transmission packet data of the buffer 107 inputted from the buffer 107, the queuing delay. Calculate the time.
- the queuing delay time can be obtained by dividing the amount of accumulated data by the transmission data rate. Then, the queuing delay calculation unit 8002 outputs the calculated queuing delay time information to the comparison control unit 800.
- the comparison control unit 800 measures that the accumulated data amount has become equal to or greater than the upper threshold value.
- a CAPACITY ALLOCATION message with a value indicating transmission stop is output to RLC processor 106, and the amount of stored data (queue length) is the lower limit threshold.
- a CAPACITY ALLOCATION message in which a value indicating transmission resumption is set is output to the RLC processor 106.
- the comparison control unit 8 0 3 determines the queuing delay time based on the queuing delay time information input from the queuing delay calculation unit 8 0 2!
- the transmission packet data requested to be retransmitted to the 1 ⁇ 1 processing unit 106 and the amount of new transmission packet data not requested to be retransmitted are controlled so as to be less than or equal to the value.
- the threshold compared with the queuing delay time in the comparison control unit 800 is the time from the time when the communication terminal apparatus requested retransmission, until the retransmission request packet requested for retransmission can not be received, until the retransmission request is made again. It is set to a value smaller than the value of imer-Status-Prohibit (retransmission request transmission time).
- the operation of the communication system for performing communication using the base station apparatus 100 and the communication terminal apparatus 200 is the same as that of FIG. 9, and thus the description thereof is omitted.
- the retransmission request is performed so that the queuing delay time of the transmission packet data requested for retransmission does not become equal to or less than the value of Timer_Status_Pro ibit. Since the storage amount in the buffer of the transmission packet data and the new transmission packet data for which retransmission is not requested is controlled, the number of retransmission requests can be reliably reduced.
- FIG. 12 is a block diagram showing a configuration of a base station apparatus 900 according to Embodiment 3 of the present invention.
- base station apparatus 900 according to Embodiment 3 shown in FIG. 4 adds separation section 9 0 1 as shown in FIG. 12 in base station apparatus 100 according to Embodiment 1. It has a buffer for retransmission packets 902 and a buffer for new packets 900 instead of the dispatcher 107.
- FIG. 12 parts that are the same as in FIG. 4 are given the same reference numerals, and descriptions thereof will be omitted.
- Communication terminal equipment The configuration of the device is the same as that shown in FIG.
- a scheduler 1104 is a reference table that stores modulation scheme information that associates a modulation scheme such as 16Q AM with CQI, and a reference table that stores coding rate information that associates a coding rate with CQI. Hold The reference table for storing the modulation scheme information and the reference table for storing the modulation scheme information are the same for the communication terminal apparatus and the base station apparatus. Then, scheduler 1 determines a transmission method such as a modulation scheme and a coding rate by referring to the reference table using the CQI input from CQI extraction section 1 03, and also determines a predetermined time unit. The communication terminal apparatus to which the bucket data is to be transmitted is determined.
- the scheduler 1 outputs the scheduling information such as the transmission parameters thus determined to the buffer for retransmission packet 902, the buffer for new packet 9 03, and the radio layer 1 processor 1 0 2 Do.
- the scheduler unit 1 4 0 sends the transmission request data stored in the retransmission buffer 9 2 0 for which retransmission is requested in the new bucket 1 buffer 3 0 3 Perform scheduling to be output to the wireless layer 1 processor 1022 prior to data.
- the separation unit 901 separates the transmission bucketed data requested to be retransmitted from the MAC-d processing unit 105 and the new transmission bucketed data, and the transmission bucketed data requested to be retransmitted is Output to the retransmission buffer buffer 902, and the new transmission packet data is output to the new packet buffer 902.
- Retransmission bucket buffer 902 temporarily stores the retransmission packet data requested to be retransmitted, which has been input from demultiplexing unit 901, and the timing and data amount according to the result of scheduling by scheduler 104.
- the transmission bucket data of is output to the wireless layer 1 processing unit 102.
- the retransmission packet buffer 902 is set with an upper threshold and a lower threshold to be compared with the amount of data stored in the transmission bucketed data requested to be retransmitted.
- the amount of stored data and the upper threshold are set. Value or comparison result of accumulated data amount and lower threshold value as accumulated data amount information «[3-03. Output to the ⁇ 1 /? Processing unit 108.
- the new packet buffer 903 temporarily accumulates new transmission packet data input from the separation unit 901, and transmits the transmission bucket data of the timing and the data amount according to the result of scheduling by the scheduler 104. 1) Output to the processing unit 102.
- the new packet buffer 903 has an upper threshold and a lower threshold to be compared with the amount of accumulated data of new transmission packet data, and the amount of accumulated data and the upper limit! /, Value or accumulated data are stored.
- the comparison result between the amount and the lower limit threshold is output to the HS-DS CH / FP processing unit 108 as accumulated data amount information.
- FIG. 13 is an operation sequence diagram showing an operation of a communication system which performs communication using base station apparatus 900, communication terminal apparatus 200, and the like.
- buffer for retransmission bucket 902 of the base station apparatus buffer for new packet 903, HS-DSCH / FP processing section 108 and R L C processing section 106 are provided in the same base station apparatus 900.
- the HS-DS CHZF P processing unit 108 of the base station apparatus 900 sets the amount of data accumulated in the buffer 902 for retransmission packets of the MAC processing unit 109 and the buffer for new packets 903. If it is confirmed that the number of AMD-PDUs is less than or equal to the predetermined lower threshold (the number of AMD-PDUs is 2 or less), a Capacity Allocation message permitting transmission of a new AMD-EDU is output to RLC processing section 106 (step ST 1001).
- the maximum number of AD-PDUs that can be transmitted in one transmission cycle T of the wireless channel is four. However, the maximum number of AMD-PDUs that can be sent in one transmission cycle T is not limited to four, and can be set to any number.
- the processing unit 106 of the base station apparatus 900 notified of the number of AMD-EDUs that may be newly transmitted is a buffer for four new AMD-PDUs 0 to 3. Output to 03 (step ST 1002).
- all transmission bucket data are stored in the buffer for new bucket 903.
- the HS-DSCHZ FP processing unit 108 transmits it to the RLC processing unit 106. Instruct to stop.
- the MAC-hs processing unit 109 takes out the AMD-PDU 0, 1 from the new packet buffer 903 according to the instruction of the scheduler 104 and transmits it to the communication terminal 200 (step ST 1003).
- AMD-PDU0 which is one of the two AMD-PDUs transmitted due to an error in the radio channel, is discarded.
- AMD-PDUs discarded here are those for which retransmission by HARQ has not been helpful.
- the R L C processing section 205 of the communication terminal apparatus 200 transmits a STATUS-PDUO in which a retransmission request for the discarded AMD-PDU 0 is set to the R L C processing section 106 of the base station apparatus 900 (step ST 1004).
- the RLC processing unit 106 does not transmit the AMD-PDU 0 requested to be retransmitted because the RLC processing unit 106 has not obtained the transmission permission of the new AMD-PDU.
- HS-DS CHZF P processing section 108 of base station apparatus 900 detects that the amount of data stored in retransmission packet buffer 902 and new packet buffer 903 is equal to or less than the lower threshold. Considering the amount of receivable data, transmission of two new AMD-PDUs is permitted to RLC processing section 106 (step ST 1005).
- the RLC processor 106 notified of the number of AMD-PDUs that may be newly transmitted outputs the AMD-EDU 0 requested to be retransmitted and another AMD-PDU 4 anew.
- the separation unit 901 outputs the AMD-PDU 0 requested to be retransmitted to the retransmission buffer buffer 902, and the retransmission packet buffer 902 stores the AMD-PDU 0. Accumulate.
- separation section 901 outputs new transmission bucket data AMD-KDU4 to buffer for new packet 900, and buffer 900 for new packet stores AMD-PDU4 (step ST10). 0 6).
- the scheduler 1 0 4 preferentially outputs the transmission bucket data requested to be retransmitted, stored in the retransmission packet buffer 9 0 2, and transmits it to the communication terminal device 2 0 0 ( Step ST 1 0 0 7) Subsequently, AMD-PDUs 2 and 3 which can not be transmitted before being requested for retransmission are output and transmitted to the communication terminal 2 0 0 (step ST 1 0 0 8).
- transmission bucket data requested to be retransmitted and new transmission packet data are separately stored, It is possible to transmit the transmission bucketed data requested to be retransmitted first, and to reduce the delay of the transmission bucketed data requested to be retransmitted.
- the HS-DSC HZF P processing unit 108 stores the buffer for retransmission packets 902 and the buffer for new packets 900 as in the first embodiment.
- the amount of data and the receivable data amount of the communication terminal 200 may be used to control the number of AMD-PDUs, as in the second embodiment, the buffer for retransmission buckets 902 and the new buckets may be used. You may control the number of AMD-PDUs using the amount of data accumulated with the buffer 900 and the queuing delay time.
- the operation procedure or transmission method of the base station apparatus may be expressed by a computer program, and the computer program may be executed by the computer, and the operation procedure or transmission of the base station apparatus
- a computer program representing the method is recorded on a recording medium such as a CD-ROM or a DVD, or a computer program representing an operation procedure or transmission method of a base station apparatus is transmitted to a computer using a telecommunication line.
- a computer program representing an operation procedure or transmission method of a base station apparatus is transmitted to a computer using a telecommunication line.
- the present invention by controlling the amount of data accumulated in the buffer of the transmission packet data requested to be retransmitted, the number of retransmissions can be reduced to improve the throughput, as well as interrupting the communication and the line. It can prevent disconnection.
- the present invention relates to a base station apparatus and transmission method, and is particularly suitable for use in a base station apparatus and transmission method using an automatic retransmission request method in which packet loss in a wireless section is recovered by retransmission of a bucket.
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- Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04747704A EP1641168A1 (en) | 2003-07-18 | 2004-07-12 | Base station device and transmission method |
US10/564,313 US20060203760A1 (en) | 2003-07-18 | 2004-07-12 | Base station device and transmission method |
Applications Claiming Priority (2)
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JP2003276974A JP2005039726A (ja) | 2003-07-18 | 2003-07-18 | 基地局装置及び送信方法 |
JP2003-276974 | 2003-07-18 |
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WO2005008946A1 true WO2005008946A1 (ja) | 2005-01-27 |
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PCT/JP2004/010240 WO2005008946A1 (ja) | 2003-07-18 | 2004-07-12 | 基地局装置及び送信方法 |
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US (1) | US20060203760A1 (ja) |
EP (1) | EP1641168A1 (ja) |
JP (1) | JP2005039726A (ja) |
CN (1) | CN1826749A (ja) |
WO (1) | WO2005008946A1 (ja) |
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Also Published As
Publication number | Publication date |
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CN1826749A (zh) | 2006-08-30 |
JP2005039726A (ja) | 2005-02-10 |
EP1641168A1 (en) | 2006-03-29 |
US20060203760A1 (en) | 2006-09-14 |
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