WO2003077462A1 - Dispositif et procede de reception - Google Patents
Dispositif et procede de reception Download PDFInfo
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- WO2003077462A1 WO2003077462A1 PCT/JP2003/003057 JP0303057W WO03077462A1 WO 2003077462 A1 WO2003077462 A1 WO 2003077462A1 JP 0303057 W JP0303057 W JP 0303057W WO 03077462 A1 WO03077462 A1 WO 03077462A1
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- Prior art keywords
- retransmission
- signal
- retransmissions
- unit
- packet
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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
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1835—Buffer management
- H04L1/1845—Combining techniques, e.g. code combining
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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
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0041—Arrangements at the transmitter end
- H04L1/0043—Realisations of complexity reduction techniques, e.g. use of look-up tables
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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
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
- H04L1/0052—Realisations of complexity reduction techniques, e.g. pipelining or use of look-up tables
-
- 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
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0071—Use of interleaving
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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
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
- H04L1/1819—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of additional or different redundancy
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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
-
- 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
- H04L2001/125—Arrangements for preventing errors in the return channel
Definitions
- the present invention relates to a receiving apparatus and a receiving method for performing error control in data transmission by making an automatic retransmission request.
- ARQ Automatic Repeat Request
- This ARQ connects the transmitting side and the receiving side by a bidirectional transmission path.
- the transmitting side first sends a bucket containing a codeword generated by performing error detection coding on information bits to the receiving side, and the receiving side corrects the error. Perform detection. If no error is detected in the received data, the receiving side returns a positive acknowledgment signal (Positive Acknowledgment: hereinafter referred to as “ACK:”) to the transmitting side indicating that the data was received correctly, and an error was detected in the received data.
- ACK: positive acknowledgment signal
- NA CK retransmission request signal
- the transmitting side transmits the first packet M, and if the receiving side correctly receives the codeword included in the first bucket M, it transmits an ACK to the transmitting side. Upon receiving this ACK, the transmitting side transmits the next second packet M + 1. Next, the receiving side mistakes this second packet M + 1. Then, it sends a NACK to the sender. When the transmitting side receives the NACK from the receiving side, it transmits (retransmits) the second packet M + 1 again. That is, the transmitting side continues transmitting the same packet as the previously transmitted bucket M + 1 without transmitting the next new third packet M + 2 unless receiving an ACK from the receiving side. ARQ achieves high quality transmission in this way.
- Hybrid ARQ is a scheme in which ARQ is combined with an error correction code, and aims to improve the error rate of a received signal using error correction, thereby reducing the number of retransmissions and improving throughput.
- One of the hybrid ARQ schemes is a Packet Combinin type hybrid ARQ.
- the transmitting side retransmits the same packet M as the previously transmitted packet M.
- the receiving side receives the codeword (systematic bit and parity bit) included in the previously received bucket M and the codeword (systematic bit and parity bit) included in the currently retransmitted bucket M. (Parity bits), and performs error correction decoding on the combined signal.
- the codeword included in the packet M received up to the previous time and the codeword included in the bucket M retransmitted this time are combined to improve the reception level. Each time the error rate of the received signal is improved. By this means, the received signal becomes error-free with a smaller number of retransmissions than ARQ without error correction, so that the throughput can be improved.
- a CK or NA CK may be erroneously transmitted to the transmitting side.
- a packet different from the packet requested by the receiving side may be transmitted from the transmitting side. More specifically, when an error is detected in the packet M on the receiving side and NACK is transmitted to the transmitting side, if the transmitting side receives ACK as ACK, the transmitting side transmits the next packet M + 1. Since the receiving side has issued a retransmission request, the previous packet M is desired to be combined. Therefore, on the receiving side, different packets (packet M and packet M + 1) are combined, and the combination has the opposite effect against the purpose of improving the reception level by combining.
- An object of the present invention is to provide a receiving apparatus and a receiving method that can avoid a decrease in throughput even when a packet different from a packet requested on the receiving side is received in data communication using hybrid ARQ. is there.
- a subject of the present invention is that a plurality of interleaving patterns corresponding to the number of transmissions are prepared in the transmitting device and the receiving device, and the transmitting device performs an interleaving of the pilot sequence in a predetermined pattern corresponding to the number of transmissions,
- the receiver has been interleaved That is, the receiver sequence knows the number of transmissions of the packet based on the pilot sequence that has been interleaved with all the interleaved patterns.
- the receiving apparatus when the receiving apparatus receives a packet different from the desired packet, it is to avoid combining the previous combined data with the currently received data or to avoid decoding. As a result, even when the receiving apparatus receives a packet different from the desired packet, it is possible to avoid a decrease in throughput.
- FIG. 1 is a diagram showing a schematic configuration of a data transmission system according to an embodiment of the present invention
- FIG. 2 is a block diagram showing the internal configuration of the transmitting apparatus according to the embodiment of the present invention
- FIG. 3 is a block diagram showing the internal configuration of the receiving apparatus according to the embodiment of the present invention
- FIG. 5 is a schematic diagram showing a dinterleaving process for each retransmission unit number according to the embodiment of the present invention.
- FIG. 6 is a diagram showing an interleaving and a dinterleaving process according to the embodiment of the present invention.
- FIG. 1 is a diagram showing a schematic configuration of a data transmission system according to an embodiment of the present invention.
- the transmitting device 100 is connected to the receiving device 200 by a bidirectional transmission path.
- the transmitting apparatus 100 adds a protocol header to generate a packet, and transmits the generated packet to the receiving apparatus 200.
- the packet is an example of a data transmission unit, and other data transmission units include frame @ superframe and the like.
- Receiving apparatus 2000 receives the bucket transmitted from transmitting apparatus 100, demodulates and performs error correction decoding, and performs error detection processing on the decoded result. If no error is detected in the decoding result due to the error detection, receiving apparatus 200 sends a reception acknowledgment signal (Positive Acknowledgment: hereinafter, referred to as “ACK:”) to transmitting apparatus 100.
- ACK reception acknowledgment signal
- NA C Kj retransmission request signal
- transmitting apparatus 100 When receiving a NACK, transmitting apparatus 100 generates a retransmission packet by multiplexing the same data sequence as the previous retransmission unit and a protocol header, and transmits the generated retransmission packet to receiving apparatus 2. Send to 0 0.
- Receiving apparatus 200 upon receiving the retransmission packet, synthesizes (power synthesis) the data received up to the last retransmission unit. Then, decoding is performed using the combined sequence. An error is detected from this decoding result, and ACK or NACK is transmitted to transmitting apparatus 100 according to the error detection result.
- transmitting apparatus 100 When receiving the NACK, transmitting apparatus 100 generates a new retransmission bucket and transmits it. Transmitting apparatus 100 repeats retransmission until receiving ACK, and upon receiving ACK, starts transmitting the next bucket.
- processing unit the processing unit from transmitting apparatus 100 transmitting a packet to receiving apparatus 200 receiving an ACK or NACK from transmitting apparatus 200 until transmitting ACK or NACK to transmitting apparatus 100 is referred to as “processing unit”.
- Retransmission unit The processing unit from when the transmitting side transmits the kth packet for the same packet until it receives ACK or NACK is referred to as the “kth retransmission unit”.
- the case where an untransmitted packet is transmitted (the first transmission count) is referred to as a first retransmission unit.
- FIG. 2 is a block diagram showing an internal configuration of transmitting apparatus 100.
- an encoding unit 101 performs error detection encoding and error correction encoding on information bits in order, and encodes the encoded signal.
- the counter 102 counts the number of transmissions of the same bucket, and outputs the counted value to the storage unit 103 and the selection circuits 104 and 107.
- the count value is reset and the count is restarted from 1.
- the storage unit 103 stores the encoded signal, and changes data to be output according to the count value output from the counter 102.
- the selection circuit 104 selects one of the interleavers 105-1-1-1-5-N according to the count value output from the counter 102, that is, the number of times of transmission of the same bucket, and Connect 103 to the selected interleaver.
- interleavers 105-5 to 105-N different interleaving patterns are defined, and each time the number of transmissions of the same bucket increases, an interleaver different from the interleaver used for the previous transmission is used.
- the data arrangement order is rearranged according to a predetermined rule (interleave pattern), and is output to the modulation section 106.
- the modulation section 106 has a modulation scheme such as QPSK or 16 QAM which is determined in advance, and a signal interleaved by any of the interleavers 105-1 to 105-N is subjected to a predetermined modulation scheme.
- the signal is modulated and the modulated signal is output to the multiplexing unit 110.
- the selection circuit 107 selects one of the interlinos 108-1-1 to 108-N according to the count value output from the counter 102, that is, the number of times the same bucket is transmitted, and inputs the selected value.
- the selected pilot pattern is output to the selected interleaver.
- interleaver 108-1-1 to 108-N different interleave patterns are defined, and each time the number of retransmissions increases, an interleaver different from the interleaver used in the previous retransmission is used.
- the data order is rearranged according to a predetermined rule (interleave pattern), and is output to the modulation unit 109.
- the interleaver 105-1-1-105-N does not necessarily have the same pattern.
- Modulating section 109 modulates the signal interleaved by any of interleavers 108-1 to 108-N, and outputs the modulated signal to multiplexing section 110.
- the multiplexing unit 110 generates a transmission bucket by multiplexing the data signal output from the modulation unit 106, the pilot signal output from the modulation unit 109, and the protocol header, and generates the generated transmission packet. Is output to the wireless transmission unit 111.
- the wireless transmission unit 111 performs predetermined conversion processing such as frequency conversion and width processing on the transmission bucket output from the multiplex unit 110 and transmits the transmission bucket to the reception device 200 via the antenna 112. .
- FIG. 3 is a block diagram showing the internal configuration of the receiving device 200.
- Radio receiving section 202 performs predetermined reception processing such as frequency conversion on a packet received via antenna 201, and outputs the packet after the reception processing to demultiplexing section 203.
- Separating section 203 separates the received packet into a pilot sequence and a data sequence. The separated pilot sequence is output to demodulation section 204, and the separated data sequence is output to demodulation section 210.
- the demodulation unit 204 demodulates the separated Pilot sequence and outputs the demodulated pilot sequence to all of the Dinter livers 205-1-N.
- Each of the interleaver 205-N has a one-to-one interleave pattern corresponding to the interleaver 108-1-1-108-N, and each interleave pattern corresponds to the pilot sequence after demodulation. Dint leave with pattern.
- the din-leaved signals are output to correlators 206-1-2-06-N, respectively.
- the correlators 206-N to 206-N perform a correlation operation between the diced pilot sequence and the known pilot sequence, and output a correlation value, which is a calculation result, to the maximum value detection unit 207.
- the known pilot sequence the same pattern is predetermined in the transmitting apparatus 100 and the receiving apparatus 200.
- the maximum value detection unit 206 detects the maximum correlation value from among the correlation values output from the correlators 206-6 to 206-N. Then, based on the maximum correlation value and the corresponding interleave pattern, it is determined how many times the current retransmission unit corresponds. The determined number of retransmission units is output to the storage unit 208, the judgment unit 209, and the selection unit 211. You.
- the storage unit 208 stores the previous number of retransmission units, and when the maximum value detection unit 207 outputs the number of retransmission units, outputs it to the determination unit 209. Also, it overwrites and stores the number of retransmission units output from maximum value detection section 207. The method of determining the number of retransmission units will be described later.
- the determining unit 209 determines whether the desired bucket of the receiving device 200 has been transmitted based on the previous retransmission unit number output from the storage unit 208 and the current retransmission unit number output from the maximum value detection unit 207. I do. The determination result is output to the combining circuit 213 and the error detection unit 217.
- Demodulation section 210 demodulates the separated data sequence, and outputs the demodulated data sequence to selection section 211.
- the selection unit 211 selects one of the dinterleavers 212-1 to 212-N according to the current retransmission unit number output from the maximum value detection unit 207, and selects the selected deinterleaver 21 2 _ 1 to 21. 2—Output the data sequence to N.
- Each of the interleavers 21 2_1 to 212-N has an interleave pattern corresponding to each of the interleavers 105-1 to 105-1N on a one-to-one basis.
- the dent leavers 212-1 to 212-N deinterleave the data sequence output to the dinter leaver selected by the selection unit 211 and output the interleaved signal to the synthesis circuit 213.
- the combining circuit 213 includes an adder 214 and a storage unit 215.
- the adder 214 combines the data sequence received in the current retransmission unit and the combined data of the data sequence received up to the previous time. Adder 214 overwrites the combined data in storage unit 215 and outputs the data to decoding unit 216.
- the storage unit 215 overwrites and stores the combined data each time retransmission is repeated. Therefore, the storage unit 215 stores data obtained by combining all the data sequences received up to the current retransmission unit.
- a discard signal is obtained from the determination unit 209 or an ACK is obtained from the error detection unit 217, the held combined data is deleted.
- Decoding section 216 outputs the combined symbol output from combining circuit 213 as an error. Correction decoding is performed and output to error detection section 217. Error detection section 217 performs error detection on the signal output from decoding section 216, generates NACK if there is an error, and generates ACK if there is no error. The generated ACK and NACK are transmitted to transmitting apparatus 100. The ACK is also output to storage sections 208 and 215 of receiving apparatus 200.
- Receiving apparatus 200 generates NACK when error detecting section 217 detects an error in packet M received in the k-th eleventh retransmission unit.
- the receiving device 200 transmits the generated NACK to the transmitting device 100.
- the transmitted N ACK is affected by fading or the like in the propagation path, and the transmitting device 100 recognizes and recognizes that the ACK has been received.
- Receiving the ACK, transmitting apparatus 100 resets counter 102 and starts the transmission processing of bucket M + 1.
- Interleavers 105—1 to 105—N each have an interleave pattern corresponding to the number of retransmission units.
- interleaver 105-1 corresponds to the first retransmission unit
- interleaver 105-2 corresponds to the second retransmission unit
- the interleaver 105-N corresponds to the Nth retransmission unit. Therefore, in the selection circuit 104, the interleaver 105-1 is selected according to the count value (retransmission unit count) “1” indicated by the counter 102, and the interleaver 105-1 is connected to the storage unit 103.
- the data sequence output from storage section 103 is interleaved by interleaver 105-1 and output to multiplexing section 110 via modulation section 106.
- Interleavers 108_1 to 108—N also have interleave patterns corresponding to the number of retransmission units, for example, interleaver 108-1 corresponds to the first retransmission unit, and interleaver 108-2 corresponds to the second retransmission unit. , Interleaver 108—N corresponds to the Nth retransmission unit.
- the selection circuit 107 selects the interleaver 108-1 according to the number of retransmission units “1” indicated by the counter 102, and selects the pilot The series is output to the interleaver 108-8-1.
- the pilot sequence is interleaved by interleaver 108_1 and output to multiplexer 110 via modulator 109.
- the multiplexing unit 110 multiplexes the modulated data sequence, the modulated pilot sequence and the protocol header, and transmits the multiplexed data sequence to the reception device 200 via the radio transmission unit 111 and the antenna 112, respectively. Is done.
- the bucket M + 1 transmitted from the transmitting device 100 is received by the receiving device 200.
- Separating section 203 separates the signal into a pilot sequence and a data sequence.
- the separated pit system J! Is demodulated by the demodulation unit 204 and deinterleaved by all of the Dinter livers 205-1-15-205-N. Din taliva 2 0 5-1 to 2 0 5-N
- the pit bit sequence that has been diced in all of the N is subjected to a correlation operation with a known pilot pattern in a correlator 2 0 6 _ 1 to 2 6 -N
- the calculated correlation value is output to maximum value detection section 207.
- the maximum value detection unit 207 detects the maximum correlation value among the correlation values output from the correlators 206-N to 206-N. In this case, since the interleaving pattern of interleave 108-1 is used on the transmission side, the pilot sequence output from the interleave 2055-1 has the largest correlation value. That is, the maximum value detection unit 2 07 can determine which interleaving pattern the bucket M + 1 transmitted from the transmitting apparatus 100 has been interleaved with, and determine the number of retransmission units corresponding to the interleaving pattern. From the first retransmission unit. The number of retransmission units “1” determined by the maximum value detection unit 207 is output to the storage unit 208, the determination unit 209, and the selection unit 211.
- the storage unit 208 notifies the determination unit 209 of the stored number of retransmission units “k ⁇ 1”. Then, the retransmission unit number “1” output from the maximum value detection unit 207 is newly overwritten and stored.
- the selection unit 2 1 the Dinta liver 2 1 2-1 corresponding to the retransmission unit number “1” output from the maximum value detection unit 2 ⁇ 7 is selected, and the data system of the bucket M + 1 is selected.
- the columns are output to Dintaliver 2 1 2-1.
- the data sequence input to the deinterleaver 2 1 2 _ 1 is deinterleaved and output to the combining circuit 2 13.
- the determination unit 209 determines the bucket transmitted this time based on the number of retransmission units notified from the storage unit 208 and the number of retransmission units determined by the maximum value detection unit 207. It is determined whether the bucket is to be performed.
- the packet desired by the receiving apparatus 200 is a packet in the k-th retransmission unit.
- the number of retransmission units output from the maximum value detection unit 2007 is “1” (indicating the first retransmission unit that is the first transmission), and it is determined that the reception device 200 is not the desired bucket. You. Based on this determination result, the determination unit 209 instructs the combining circuit 21 to discard the combined data up to the k-th eleventh retransmission unit stored in the storage unit 215.
- the combining circuit 2 13 there is no data to be combined with the data sequence of the bucket M + 1 output from the ding liver 2 12 2-1, so the data sequence of the packet M + 1 is output to the decoding unit 2 16 as it is. .
- the receiving apparatus 200 receives a bucket M + 1 different from the desired packet M, the combined data of the bucket M up to the k ⁇ 1th retransmission unit and the bucket M + 1 data sequence of the first retransmission unit Can be prevented from being synthesized.
- the packet M and the erroneously transmitted bucket M + 1 are combined, both may not be able to be decoded, but by performing the above-described processing, the erroneously transmitted bucket M + 1 of the first retransmission unit is decoded. Decoding can be performed, and a decrease in throughput can be avoided.
- the combined data of the bucket M up to the k-th eleventh retransmission unit stored in the reception device 200 is discarded, but retransmission processing is performed by the upper layer.
- a configuration is also conceivable in which the receiving apparatus 200 notifies the transmitting apparatus 100 of the return to the retransmission unit of the bucket M. With this configuration, the number of packets to be discarded can be reduced, and a decrease in throughput can be avoided.
- the transmitting device 100 The operation of the transmitting device 100 and the receiving device 200 when the is received as a NACK will be described.
- Receiving device 200 generates ACK when received packet M does not detect an error in error detecting section 217.
- the receiving device 200 transmits the generated ACK to the transmitting device 100.
- the transmitted ACK is affected by fading and the like in the propagation path, and the transmitting apparatus 100 recognizes that the NACK has been received.
- transmitting apparatus 100 increments counter 102 and retransmits packet M.
- the retransmission unit at this time is the k-th retransmission unit (k ⁇ 1).
- Transmitting apparatus 100 interleaves a pilot sequence to be multiplexed on packet M using interleaver 108-k corresponding to the k-th retransmission unit. Similarly, the data sequence to be multiplexed on the bucket M is interleaved using the interleaver 105-k corresponding to the k-th retransmission unit. The bucket M of the k-th retransmission unit interleaved in this way is transmitted to receiving apparatus 200.
- the packet M transmitted from the transmitting device 100 is received by the receiving device 200.
- the pilot sequence is dinged by all of the ding livers 205-5-1 to 205-N. Dintariever 2 0 5— 1 to 2 0 5—N
- the calculated correlation value is output to the maximum value detection unit 207.
- the maximum value detection unit 207 detects the maximum correlation value among the correlation values output from the correlators 206-1-2 to 206-N. In this case, since the interleaving pattern of interleave 108-k is used on the transmission side, the pilot sequence output from dinterleave 205-k has the largest correlation value.
- the maximum value detection unit 2007 determines that the packet M transmitted from the transmission device 100 is a bucket in the k-th retransmission unit.
- the number of retransmission units “k” determined by the maximum value detection unit 207 is output to the storage unit 208, the determination unit 209, and the selection unit 211.
- the storage unit 208 since the ACK has already been obtained from the error detection unit 217, “0” is stored, and the determination unit 209 is notified of the number of retransmission units “0”. Also, the retransmission unit number “k” output from the maximum value detection unit 207 is newly overwritten and stored.
- dinterleaver 2 1 2 — k corresponding to retransmission unit number “k” output from maximum value detecting section 2 07 is selected, and data sequence of packet M is dinter lever 2 1 2 — k Is output to The data sequence input to the din talever 2 1 2—k is din leaved and output to the combining circuit 2 13.
- the determination unit 209 determines the bucket transmitted this time based on the number of retransmission units notified from the storage unit 208 and the number of retransmission units determined by the maximum value detection unit 207. It is determined whether the bucket is to be performed. Since the number of retransmission units notified from the storage unit 208 is “0”, the packet desired by the receiving apparatus 200 is the packet of the first retransmission unit. However, the number of retransmission units output from maximum value detection section 207 is “k” (indicating retransmission), and it is determined that receiving apparatus 200 is not a desired packet. Based on the result of the determination, the determination unit 209 stops outputting the data sequence of the bucket M to the decryption unit 2 16 to the synthesis circuit 2 13, and the error detection unit 2 17 To make an ACK for packet M again.
- the combining circuit 2 13 since the storage unit 2 15 has already acquired the ACK, there is no stored combined data, and the bucket M data series is not combined by the adder 2 14. Further, since the combining circuit 2 13 receives an instruction from the judging section 2 09 to stop outputting the data sequence of the bucket M to the decoding section 2 16, the adding circuit 2 14 The output data series is output only to the storage unit 215.
- the error detecting unit 211 generates an ACK again according to the instruction of the determining unit 209, transmits the generated ACK to the transmitting apparatus 100, and stores the storage unit 208 and the storage unit 2 1 Output to 5. Accordingly, transmitting apparatus 100 receives the ACK, and starts processing for transmitting the next bucket M + 1, which is an untransmitted bucket.
- the storage unit 208 acquires the ACK, By resetting the number of retransmission units “k” that has already been transmitted and the storage unit 215 also acquiring an ACK, the erroneously transmitted data sequence of the bucket M is deleted.
- the packet desired by the receiving apparatus 200 is the packet M + 1 of the first retransmission unit, even if the retransmission packet of the packet M is received, the data sequence of the packet M is discarded without decoding. Therefore, it is not necessary to decode again the data of the packet M which has already been detected without error and decoded. As a result, a decrease in throughput can be avoided.
- FIG. 4 is a schematic diagram showing an interleaving process for each retransmission unit number according to the embodiment of the present invention.
- the pilot sequence is 8 symbols
- IL 1 (1, 5, 2, 8, 4, 7, 6, 3).
- the symbol sequence input in the order of S Ss is rearranged in the order of S 5 , S 2 , S 8 , S 4 , SS 6) S 3 and output.
- the second retransmission unit will be described.
- counter 102 indicates “2”, and selection circuit 107 selects IL 2 corresponding to the second retransmission unit.
- the pilot sequence is interleaved with IL 2 of interleaver 108-2.
- the interleave and the Dinter V using IL 2 will be described with reference to FIG. As shown in this figure, the order of the pilot sequence before the interleaving is rearranged according to the pattern shown by IL2, and the order of the IL2 becomes the order of the pilot sequence after the interleaving.
- Dinterleaving in receiving apparatus 200 performs a process of returning interleaved sequence P ′ to original sequence P before interleaving. That is, the arrangement order of the bit sequence after interleaving is rearranged in the numerical order indicated by IL2. Specifically, it rearranges the S 8 is the first element of the I interleaving symbol sequence P 'in the order indicated by the first of the elements of I 2 (8). Similarly, the second element Si of the interleaved symbolic sequence P ′ is rearranged in the order (1) indicated by the second element of IL2. In this way, by rearranging all the pilot sequences P 'after interleaving, it is possible to return to the pilot sequence P before interleaving.
- pilot sequence P after interleaving is interleaved in all interleave patterns.
- FIG. 6 shows the interleaving patterns IL1 to IL3 used in FIG. 4, and shows a state in which p's are rearranged by IL1 to IL3 according to the above-described deinterleaving processing.
- C m is the output from the correlator connected to Dintariba corresponding to the m retransmission unit
- N is the pi port Tsu preparative sequence length
- P 'm is Dintaripu by the corresponding Dinta interleaver in the m retransmission unit
- the i-th element of the pilot sequence, p i is the i-th element of the known pilot sequence.
- Figure 6 shows the result of calculating the correlation value according to this equation.
- Known pilot pattern is (S There S 2, S 3, S 4 , S 5, S 6, S 7, S 8).
- Si Sg has the numerical values used in FIG.
- the correlation value between the pilot sequence deinterleaved by IL1 and IL3 and the known pilot pattern shows 0.5.
- the correlation value between the pilot sequence diced by IL 2 and the known pilot pattern is 1, which is the maximum correlation value.
- a regular pattern P (1,1,1,1,1,1,1,1,1) is used as a pirate pattern.
- a sequence that reduces the cross-correlation value of other sequences such as M sequence and GOLD sequence .
- the sequence length is set to 8, but it is preferable to use a sequence length that reduces the correlation value of different interleaving patterns.
- the interleaving method and the interleaving method described above are merely examples, and there are other methods of rearranging according to a predetermined rule.
- interleaving is performed before modulation by modulating section 106 and modulating section 109 of transmitting apparatus 100, and demodulating section 204 and modulating section 204 of receiving apparatus 200 are interleaved.
- bit interleaving for performing interleaving after demodulation in demodulation section 210 has been described, interleaving is performed after modulation in modulation section 106 and modulation section 109 of transmitting apparatus 100, and receiving apparatus 200 It is also easy to apply the symbol interleave for performing the ding-up before demodulation by the demodulation unit 204 and the demodulation unit 210. If the interleaving and the interleaving are performed with the modulation symbols, the amount of data to be interleaved is reduced, so that the processing amount can be reduced.
- bit 1 and interleave are used for both the pilot and the data.However, it is not always necessary to match them, and for example, symbol interleave is used for the pilot and data is used for the data. A configuration using bit interleaving is also possible.
- the signal is spread after modulation in modulators 106 and 109 of transmitting apparatus 100, and is spread before demodulation in demodulators 204 and 210 of receiving apparatus 200.
- CDMA Code Division Multiple Access
- the data transmission system of the present embodiment can be applied to a digital wireless cellular system.
- the receiving device 200 is mounted on the communication terminal that freely moves in the cell, and the transmitting device 100 is mounted on the base station.
- the transmitting device 100 is mounted on the base station.
- the first transmission and retransmission are collectively treated as “the number of retransmission units”, but in the claims, they are described as “the number of retransmissions J. Both are synonymous.
- a plurality of interleaving patterns corresponding to the number of times of transmission of the same bucket are known between the transmitting and receiving apparatuses, and the receiving apparatus determines the received packet based on the interleaving pattern.
- the receiving apparatus determines whether or not the packet is the one desired by the receiving device without performing a decoding process, and it is possible to reduce the processing amount and the processing delay.
- the receiving device may differ from the desired bucket by avoiding combining with the previous combined data or avoiding decoding. Even if a packet is received, a decrease in throughput can be avoided.
- the present invention is suitable for use in a receiving apparatus and a receiving method for performing error control in data transmission by performing an automatic retransmission request.
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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AU2003213357A AU2003213357A1 (en) | 2002-03-14 | 2003-03-14 | Reception device and reception method |
DE60328168T DE60328168D1 (de) | 2002-03-14 | 2003-03-14 | Empfangseinrichtung und empfangsverfahren |
US10/477,142 US7174493B2 (en) | 2002-03-14 | 2003-03-14 | Reception apparatus and reception method |
EP03708603A EP1484853B1 (en) | 2002-03-14 | 2003-03-14 | Reception device and reception method |
Applications Claiming Priority (2)
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JP2002-70866 | 2002-03-14 | ||
JP2002070866A JP3490425B2 (ja) | 2002-03-14 | 2002-03-14 | 受信装置及び受信方法 |
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WO2003077462A1 true WO2003077462A1 (fr) | 2003-09-18 |
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PCT/JP2003/003057 WO2003077462A1 (fr) | 2002-03-14 | 2003-03-14 | Dispositif et procede de reception |
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US (1) | US7174493B2 (ja) |
EP (1) | EP1484853B1 (ja) |
JP (1) | JP3490425B2 (ja) |
CN (1) | CN1320796C (ja) |
AU (1) | AU2003213357A1 (ja) |
DE (1) | DE60328168D1 (ja) |
WO (1) | WO2003077462A1 (ja) |
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US8102878B2 (en) | 2005-09-29 | 2012-01-24 | Qualcomm Incorporated | Video packet shaping for video telephony |
US8406309B2 (en) | 2005-10-21 | 2013-03-26 | Qualcomm Incorporated | Video rate adaptation to reverse link conditions |
US8514711B2 (en) | 2005-10-21 | 2013-08-20 | Qualcomm Incorporated | Reverse link lower layer assisted video error control |
US8842555B2 (en) | 2005-10-21 | 2014-09-23 | Qualcomm Incorporated | Methods and systems for adaptive encoding of real-time information in packet-switched wireless communication systems |
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Also Published As
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US20040148552A1 (en) | 2004-07-29 |
EP1484853A1 (en) | 2004-12-08 |
JP3490425B2 (ja) | 2004-01-26 |
US7174493B2 (en) | 2007-02-06 |
CN1516937A (zh) | 2004-07-28 |
JP2003273844A (ja) | 2003-09-26 |
EP1484853B1 (en) | 2009-07-01 |
AU2003213357A1 (en) | 2003-09-22 |
DE60328168D1 (de) | 2009-08-13 |
EP1484853A4 (en) | 2008-04-09 |
CN1320796C (zh) | 2007-06-06 |
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