CN102195765B - Transmission control method for wireless communication system - Google Patents

Abstract

The invention discloses a transmission control method for a wireless communication system. A transmission device (1) adds data block identification information uncompetitive among pieces of stream data to data blocks according to each of a plurality of pieces of stream data, and transmits the data block identification information according to each of the plurality of pieces of stream data; and a receiving device (2) retransmits and synthesizes the received data blocks and retransmitted data blocks to which the same data block identification information is added according to the data block identification information added to the received data blocks. Therefore, even though the number of streams transmitted between the transmission device (1) and the receiving device (2) is changed/decreased, the integrity of the data blocks serving as retransmission and synthesis objects can be maintained, and normal communication can be continued.

Description

Transfer control method in wireless communication system

The application, based on Patent Law detailed rules for the implementation the 42nd article proposition, be the applying date is on October 27th, 2006, application number is the divisional application of the application for a patent for invention " transfer control method in wireless communication system and dispensing device and receiving system " of 200680056206.X.

Technical field

The present invention relates to transfer control method in a kind of wireless communication system and dispensing device and receiving system, particularly relate to the repeating transmission control technology being applicable to MIMO (Multi Input Multi Output, multiple-input and multiple-output) and transmitting.

Background technology

About mobile communication system such as portable phones, at present based on CDMA (Code Division Multiple Access, code division multiple access accesses) third generation mode of mode started service, and advancing with the research realizing the next generation mobile communication system of more high-speed traffic based on OFDMA (Orthogonal Frequency Division Multiple Access, orthogonal frequency-time multiple access) mode (non-patent literature 1 with reference to describing below).

Therefore, as the technology making transmission rate rapid, MIMO is suggested as strong technology.Figure 19 represents the overview of mimo transmission system.Mimo transmission system shown in this Figure 19 is configured to comprise: the dispensing device 100 with multiple transmitting antenna (antenna sets) Tx#1, Tx#2 ..., Tx#n (n is the integer of more than 2); With the receiving system 200 with multiple reception antenna (antenna sets) Rx#1, Rx#2 ..., Rx#n, this mimo transmission system is from the different data flow of each transmitting antenna Tx#i (i=1 ~ n) transmitted in parallel thus increases the spatial multiplexing transmission technology of transmission capacity pro rata with number of transmit antennas n.Different transmitting antenna Tx#i is configured to non-correlation each other, from each transmitting antenna Tx#i send data flow respectively by the transmission path that independently declines, be received antenna Rx#i with the state mixed with other data flow in space and receive.

As the realization example of this mimo transmission system, as shown in figure 20, the method for independently carrying out flowing process to each antenna is such as had.Such as, PARC (the Per Antenna Rate Control not carrying out precoding (Precoding) can be enumerated, each Antenna Rate controls) (non-patent literature 2 with reference to describing below) and carry out the PSRC (Per Stream Rate Control, each flow rate controls) (non-patent literature 3 with reference to describing) etc. of precoding below.

Specifically, in system shown in this Figure 20, such as dispensing device 100 is configured to comprise stream separation unit 101, eachly sends CRC appendix 102, coding unit 103 and HARQ handling part 104, the sending part 105 of stream and retransmit control part 106, and receiving system 200 is such as configured to comprise Signal separator/combining unit 201, each HARQ handling part 202 and CRC operational part 203, ACK/NACK detection unit 204 and stream combining unit 205 receiving stream.In addition, ATR represents the reception antenna of dispensing device 100, ATT represents the transmitting antenna of receiving system 200, in this example, conveniently, illustrate from transmitting antenna ATT and send ACK/NACK (Acknowledgement/Negative Acknowledgement) signal (confirmation answer signal), and situation about being received by reception antenna ATR.

Further, dispensing device (hereinafter also referred to transmitter side) 100 is such as according to the flow chart action shown in Figure 21, and receiving system (hereinafter also referred to receiver side) 200 is such as according to the flow chart action shown in Figure 22.

Namely, in dispensing device 100, transmission data are separated into the transmission stream (steps A 1) of each antenna sets Tx#i by flowing separation unit 101, CRC (the Cyclic Redundant Check transmission stream additional error of each antenna sets Tx#i detected by CRC appendix 102, cyclic redundancy check (CRC)) code (steps A 2), in order to correct bit-errors, the coding of data flow is carried out in coding unit 103, in order to retransmit control, HARQ (Hybrid Automatic Repeat reQuest) process (steps A 4) is carried out in HARQ handling part 104, in sending part 105, select the transmitting antenna Tx#i of transmitting HARQ block (process) and modulate, then receiving system 200 is sent to.At this, when using precoding (when steps A 5 is "Yes"), each process can select multiple transmitting antenna Tx#i, but when PARC (when steps A 5 is "No"), sends from predetermined transmitting antenna Tx#i.

On the other hand, in receiving system 200, as shown in figure 22, after the signal sent from dispensing device 100 is received by each reception antenna Rx#i, carry out the separation/synthesis (step B1) of this Received signal strength via Signal separator/combining unit 201, judge whether the signal (process) received is repeating transmission process (step B2).If result is repeating transmission process (step B2 is "Yes"), the signal that receiving system 200 utilizes HARQ handling part 202 this to be received and previous receive and the Received signal strength of the same process kept synthesis (step B3).The CRC utilizing CRC operational part 203 inspection to be attached in each process, detects bit-errors (step B4) thus.In addition, when the process that this receives is not repeating transmission process (step B2 is "No"), does not carry out the synthesis of HARQ handling part 202, and carry out bit-errors detection (step B4) by CRC operational part 203.

And, when bit-errors being detected in ACK/NACK detection unit 204 (step B5 is "Yes"), keep receiving process and utilize transmitting antenna ATT to reply NACK signal (step B6) to dispensing device 100, when mistake not detected (step B5 is "No"), utilize transmitting antenna ATT to reply ack signal to dispensing device 100, and process is delivered to upper layer (step B7).In addition, do not detect that the Received signal strength of each stream of mistake finally synthesizes rear output by stream combining unit 205.

In this series of processes, the critical function needed for high-speed traffic is HARQ.HARQ is the ARQ mode being combined with arq (ARQ) and error correction coding (FEC:Forward Error Correction, forward error correction).Specifically, the parity check bit detected in transmitter side 100 pairs of block of information bits additional error carries out error correction coding, and sends its all or part of.When producing repeating transmission, retransmit for all or part of in the coded-bit of current block.

In receiver side 200 pairs of retransmission blocks, each bit of the correspondence of each existing block carries out synthesis process, and the Synthetic block using its result to obtain carries out error correction and error detection process again.Like this, receiver side 200 repeats to the ACK/NACK reply of transmitter side 100 and the retry based on the decoding process of retransmitting, until the mistake of block is eliminated in predetermined upper limit numbers range.

In mobile communicating of future generation, be especially suitable for N-channel Stop-and-Wait ARQ (non-patent literature 4 with reference to describing) below.At this, N represents integer, represents the block number (process number) that can simultaneously send.About the process sent simultaneously, carry out controlling based on the repeating transmission of Stop and Wait to each process.

Figure 23 represents the overview of N-channel Stop-and-Wait ARQ.

Each process is sent out in the unit interval (TTI:Transmission Time Interval) of wireless transmission, and utilizes this identifier of process sequence number N to identify.Shown in this Figure 23, the situation of process number N=5 (0 ~ 4), is therefore equivalent to the situation of 5-channel Stop-and-Wait ARQ.In addition, in fig 23 conveniently, represent the data division additional process sequence number of each process, but in fact process sequence number is sent by control channel, the data division of each process is not attached to process sequence number.That is, process sequence number is subsidiary (following identical) that is sent out in the data division of each process.

Receiving system 200 carries out error detection recited above after receiving process from dispensing device 100.At this, suppose in process 0 ~ 4, process " 1 ", " 3 ", " 4 " produce mistake, process " 0 ", " 2 " do not produce mistake, for the process " 0 ", " 2 " that do not produce mistake, reply ack signal to dispensing device 100, for the process " 1 ", " 3 ", " 4 " that create mistake, maintenance process in memory (omitting diagram), then replys NACK signal to dispensing device 100.The reply of ack/nack signal is also sent by control channel, but does not need reply process sequence number during this situation.

Receiving system 200 adjusts timing turnaround time of each process and replys ack/nack signal, and dispensing device 100 can identify it is ack/nack signal for which process thus.The transmission of new process is carried out after dispensing device 100 receives ack signal, but process sequence number now can add arbitrarily comprise additional process sequence number time be engraved in interior, there is no used process sequence number (in fig 23, carrying out additional process sequence number according to the ascending order of original process sequence number) in 5 processes in the past.

On the other hand, after dispensing device 100 receives NACK, carry out the repeating transmission of the process creating mistake, process sequence number is now added the sequence number identical with previous process sequence number.After retransmission, receiving system 200 identifies process sequence number, and judgement should be synthesized with which process.That is, when receiving repeating transmission process and process " 1 ", " 3 ", " 4 ", respectively with there is the process " 1 " of the identical process sequence number kept when previous transmission NACK signal, " 2 ", " 3 " carry out point being combined into.Check CRC in post synthesis, when can not receive mistakenly, reply ACK to dispensing device 100.On the other hand, when creating mistake, keeping the process after synthesis, again replying NACK signal to dispensing device 100.

In addition, the method about synthesis has two kinds of representational methods, and the present invention can use any one synthetic method.One be retransmit time retransmit with before send time identical data, Received signal strength synthesis by Received signal strength when sending in the past and when retransmitting, and carry out the generation of the data decoded, another kind is the collapsed mode (puncturing pattern) of the data change coding when retransmitting after, and the bit do not sent till being sent to the present, Received signal strength synthesis by Received signal strength when sending in the past and when retransmitting, reduce the encoding rate of equivalence, improve error correcting capability (coding gain).The technology of the latter is called as IR (Incremental Redundancy, steadily increase redundancy).

The similarities and differences of this process process and the PARC described above and precoding are irrelevant carries out all in the same way.Therefore, go on to say for PARC below.

The situation of N-channel Stop-and-Wait ARQ when Figure 24 represents that dispensing device 100 and receiving system 200 correspond to PARC.

As previously described, in PARC, CRC adds, encode, HARQ process is independently carried out for each antenna, so HARQ process sequence number is also added independently sequence number.In fig. 24, represent send from transmitting antenna Tx#1 process " 1 ", " 3 ", " 4 " and produce the situation (with reference to dotted arrow) retransmitted from the process " 1 " that transmitting antenna Tx#2 sends.In this case, as previously described, carry out HARQ for each antenna sets, control so independently carry out repeating transmission to each antenna sets.In addition, the addition method of process sequence number adds according to the rule identical with Figure 23.

Further, in the MIMO transmission of mobile body communication system of future generation, in order to the data-signal separation/synthesis will sent between transmitting antenna Tx#i, dispensing device 100 transmitting antenna identification signal (such as pilot signal and scrambling code).

Pilot signal additional example when Figure 25 represents that the transmitting antenna of dispensing device 100 is two.As shown in (1) and (2) in this Figure 25, with same time sequence, different frequency sequence additional pilot signal (R:Reference Symbol) between each antenna sets Tx#1, Tx#2.Receiving system 200 is by referring to pilot signal, the signal of separate antenna group Tx#1 from the signal that the antenna sets Rx#1 by receiving system 200 receives, the signal of separate antenna group Tx#2 from the signal that the antenna sets Rx#2 by receiving system 200 receives, makes the stream (process) sent after each signal syntheses restore.And usually, the corresponding relation of antenna sets and pilot signal utilizes announcement information to send.

Non-patent literature 1: " 3GPP TR25.913 V7.3.0 Requirements for Evolved UTRA (E-UTRA) and Evolved UTRAN (E-UTRAN) (Release7); " 3GPP (France), 2006-03

Non-patent literature 2:Lucent, " Improving MIMO throughput with per-antenna rate control (PARC), " 3GPP (France), 2001-08

Non-patent literature 3:Lucent, " Per Stream Rate Control with Code Reuse TxAA and APP Decoding for HSDPA, " 3GPP (France), 2002-09

Non-patent literature 4: " 3GPP TR25.814 V7.4.0 Physical Layer Aspects for evolved Universal Terrestrial Radio Access (UTRA) (Release7); " 3GPP (France), 2006-06

About the communication environment being suitable for mimo transmission system, such as, can enumerate the cell structure shown in Figure 26.Namely, be the form in region according to the form of MIMO transmission a cell division, as shown in Figure 26 (1), when mobile radio station 400 is positioned at the inside region (MIMO multiplexing transmission region) 302 of base station 300, carry out MIMO multiplexing transmission (utilizing two flow transmission in Figure 26 (1)), when being positioned at exterior lateral area (non-MIMO multiplexing transmission region) 303, carry out non-MIMO multiplexing transmission (utilizing a flow transmission in Figure 26 (1)).In addition, so-called " non-MIMO multiplexing transmission " such as refers to MIMO diversity transmission and utilizes an antenna to carry out the MIMO single transport of the transmitting-receiving of a stream.

And, as shown in Figure 26 (2), even if also exist in MIMO multiplexing transmission region 302, but when the near zone 301 that mobile radio station 400 is positioned at base station 300 carries out looking logical communication, but carry out the situation of non-MIMO multiplexing transmission (utilizing a flow transmission in Figure 26 (2)).This is because look logical in communication time produce between antenna and be correlated with, so be difficult to the separation/synthesis of carrying out signal in receiving system 200, likely can not realize heavy traffic.

In this case, even if also do not carry out MIMO multiplexing transmission in the near zone 301 of base station 300, and carry out non-MIMO multiplexing transmission with modulation rate, high code-rate, this method likely will realize heavy traffic.

Like this, be not be suitable for MIMO multiplexing transmission at a community internal fixtion, but according to the position of mobile radio station 400, be sometimes suitable for non-MIMO multiplexing transmission yet.Such as, when the wireless quality (such as mobile radio station 400 is reported to the mean value of the SN ratio of base station 300) of mobile radio station 400 is greater than certain threshold value, carries out MIMO multiplexing transmission, carrying out non-MIMO multiplexing transmission when being less than this threshold value.

Now, fluxion amount is reduced to a stream from multiple stream, such as PARC in the method for each antenna sets independence additional process sequence number, when fluxion amount reduces, the process sequence number of HARQ repeats (competition), likely causes can not continuing to communicate.

Such as, Figure 27 represents action example when switching to MIMO diversity transmission from MIMO multiplexing transmission in PARC.This example represents and utilizes a situation flowing back to multiple ack/nack signal.

From the antenna sets Tx#1 of dispensing device 100 and antenna sets Tx#2 according to the timed sending process " 0 " shown in Figure 27, " 1 ", " 2 ", after replied the ack signal for the process " 0 " sent from each antenna sets Tx#1, Tx#2, " 1 " from receiving system 200 to dispensing device 100, utilize the timing that symbol 500 represents in figure 27, the position of mobile radio station 400 moves to non-MIMO multiplexing transmission region (MIMO diversity transmission region) 301 or 303 from the MIMO multiplexing transmission region 302 shown in Figure 26.

Now, if the main antenna group of dispensing device 100 of the process carrying out the stream flowed into is set to antenna sets Tx#2, then dispensing device 100 from antenna sets Tx#1 and Tx#2 be sent in switch to MIMO diversity transmission before the process " 2 " that stores.Receiving system 200 utilizes antenna sets Rx#1 and Rx#2 to receive these signals, carries out the synthesis of signal and builds process " 2 ".Then, receiving system 200 is attempted carrying out being combined into dividing of the process " 2 " kept during previous transmission, but produces following problem herein.

(problem 1) receiving system 200 can not identify that repeating transmission process " 2 " with which process kept should be synthesized.Namely, such as shown in Figure 28, receiving system 200 retransmits process " 2 " by MIMO diversity reception, but as previously described, when only have viewed process sequence number to carry out point to be combined into, because antenna sets Rx#1 and antenna sets Rx#2 remains process " 2 " respectively, so can not judge with which process to synthesize.Suppose when the process (reference marks 601) of attempting with kept by main antenna group Rx#2 is synthesized, the process " 2 " of the process " 2 " (reference marks 602) of antenna sets Rx#1 and the antenna sets Rx#2 that utilizes symbol 601 to represent is carried out point to be combined into, the conformability of synthesizing is destroyed.

In addition, following problem is also produced.

(problem 2), in dispensing device 100, the mistake shown in situation 1,2 produced below is retransmitted.

(situation 1) carries out the situation of the reply of ack/nack signal by time timing adjustment

In this case, by base station, the reply of ACK/NACK timing (turnaround time and reply frequency) is indicated to mobile radio station.

Figure 29 represents its overview.Receiving system 200 replys ack/nack signal by the time timing adjustment of main antenna group Rx#2.Now, dispensing device 100 utilizes the timing information of main antenna group Tx#2 to receive reply.During this situation, as shown in figure 29, dispensing device 100 receives the repeating transmission timing coincidence of the timing of reply and the process " 2 " of the antenna sets Tx#2 utilizing symbol 603 to represent, should the process " 2 " of retransmitting antenna group Tx#1, but the process " 2 " of likely retransmitting antenna group Tx#2 mistakenly.Now, can not the process " 2 " of retransmitting antenna group Tx#1.

(situation 2) is not utilize time timing adjustment but utilize process sequence number to carry out the situation of the reply of ack/nack signal

This situation refers to not carry out the situation that namely timing adjustment performs the reply of ACK/NACK.Therefore, different from situation 1, do not need the instruction of carrying out replying timing adjustment, but need additional process sequence number when replying ACK/NACK.

Figure 30 represents its overview.Receiving system 200 is expressed process sequence number from main antenna group Rx#2 and is replied ack/nack signal.Now, reply is received by antenna sets Tx#2.Now, as shown in figure 30, when receiving the reply for the process " 2 " of antenna sets Tx#1, dispensing device 100 is interpreted as being the NACK signal of the process " 2 " for antenna sets Tx#2 mistakenly.Therefore, can not the process " 2 " of retransmitting antenna group Tx#1.

Like this, following problem will be produced when producing the repetition of process sequence number in each antenna sets, which can not judge to synthesize between the process of antenna sets in receiving system 200, on the other hand, the mistake producing process in dispensing device 100 is retransmitted, and the process that should retransmit can not be retransmitted.

Further, when utilizing two to flow to dispensing device 100 reply confirmation response (ack/nack signal) from receiving system 200, also the problem identical with the problems referred to above is produced.Figure 31 and Figure 32 represents this situation.That is, in receiving system 200, as shown in figure 28, can not judge that repeating transmission process " 2 " with which process kept by antenna sets Rx#1 and antenna sets Rx#2 respectively should be synthesized.Further, in dispensing device 100, the problem identical with the problem utilizing Figure 29 with Figure 30 to describe is produced above.

That is, when switching to MIMO diversity transmission from MIMO multiplexing transmission,

(1) when reply from receiving system 200 confirmation response be reply from antenna sets Rx#2, as shown in figure 31, ack/nack signal is replied from the transmitting antenna ATT2 of receiving system 200, but during this situation, the action of dispensing device 100 is identical with the situation shown in Figure 29 with Figure 30, the process " 2 " of ground retransmitting antenna group Tx#2 so lead to errors, and can not the process " 2 " of retransmitting antenna group Tx#1

(2) when reply from receiving system 200 confirmation response be replied by MIMO diversity, as shown in figure 32, ack/nack signal is replied from transmitting antenna ATT1 and ATT2, so the signal that dispensing device 100 diversity reception is replied by reception antenna ATR1 and ATR2, but because main antenna group is antenna sets Tx#2, so finally they are determined is reply for antenna sets Tx#2.Therefore, the process " 2 " of the ground retransmitting antenna group Tx#2 that leads to errors, and can not the process " 2 " of retransmitting antenna group Tx#1.

Summary of the invention

The present invention proposes in view of the above problems, its object is to, as switched to the situation of MIMO diversity transmission from MIMO multiplexing transmission, when transport stream number change (minimizing), also can maintain the conformability of process sequence number (namely flowing identification), can continue normally to communicate.

In order to achieve the above object, feature of the present invention uses transfer control method in following wireless communication system and dispensing device and receiving system.That is,

(1) feature of the first method of the transfer control method in wireless communication system of the present invention is, can transmit the wireless communication system of multiple flow data with predetermined data block unit to receiving system from the dispensing device with multiple transmitting antenna, this dispensing device each flow data to described multiple flow data is attached between described flow data does not respectively have competitive data block identifying information, this data block is sent to this receiving system, this receiving system is according to from described data block identifying information attached in the reception data block of this dispensing device, repeating transmission synthesis process is carried out to the data accepted block and retransmitted data blocks that are attached with identical block identifying information.

(2) at this, this dispensing device also can be attached in described data block as described data block identifying information using the information comprising antenna identifier, and described antenna identifier is for the relevant identifier of the transmitting antenna sending described flow data.

(3) and, a series of serial number information also can divide into groups according to described each flow data by this dispensing device, and according to this each flow data, the serial number information in corresponding group is attached in described data block as described data block identifying information.

(4) in addition, this receiving system also can add described data block identifying information to the re-send request may for described reception data block, this re-send request may is sent to this dispensing device, this dispensing device is when receiving described re-send request may, using the data block utilizing described data block identifying information additional in this re-send request may to identify as described retransmitted data blocks, retransmit to this receiving system.

(5) and, the feature of the second method of the transfer control method in wireless communication system of the present invention is, can transmit the wireless communication system of multiple flow data to receiving system from the dispensing device with multiple transmitting antenna, this dispensing device detects the minimizing governing factor of described flow data quantity, when detecting described minimizing governing factor, according to about reduce control object flow data do not send data volume, make described flow data quantity minimizing control constant time lag.

(6) at this, this dispensing device also after the described transmission not sending data terminates, can be implemented described minimizing and controls.

(7) and, this dispensing device also can monitor the wireless quality between this receiving system, when described wireless quality is lower than predetermined threshold value, even if the transmission of described remaining data does not terminate, also implement described minimizing control.

(8) in addition, this dispensing device also can monitor the wireless quality between this receiving system, if there is not the remaining data of the flow data reducing object lower than the time point of predetermined threshold at described wireless quality, then the minimizing implementing described fluxion amount at this time point controls.

(9) and, dispensing device of the present invention is the dispensing device that can to transmit to receiving system from the dispensing device with multiple transmitting antenna with predetermined data block unit the wireless communication system of multiple flow data, the feature of this dispensing device is, have: data block identifying information extra cell, it is according to each flow data of described multiple flow data, to described data block added block identifying information; Transmitting element, it sends to this receiving system and be addition of the data block of described data block identifying information; And control unit, it controls this data block identifying information extra cell, to make described data block identifying information described each flow data between the not competition additional to described data block.

(10) at this, this control unit also can be configured to have antenna identifier generating unit, this antenna identifier generating unit as the data block identifying information that should be attached in the data block of this data flow, and is supplied to this data block identifying information extra cell using the information of the antenna identifier of the transmitting antenna comprised for described data flow.

(11) and, this control unit also can be configured to have by group serial number gencration portion, a series of serial number information should be divided into groups according to described each data flow by group serial number gencration portion, and according to this each data flow, using the serial number information in corresponding group as the data block identifying information that should be attached in described data block, be supplied to this data block identifying information extra cell.

(12) in addition, described dispensing device can also also have repeating transmission control unit, when receive from this receiving system by addition of described data block identifying information, re-send request may for described reception data block time, this repeating transmission control unit retransmits the data block utilizing this data block identifying information to identify to this receiving system.

(13) and, receiving system of the present invention is the receiving system that can to transmit to receiving system from the dispensing device with multiple transmitting antenna with predetermined data block unit the wireless communication system of multiple flow data, it is characterized in that, this receiving system has: receiving element, its receive by this dispensing device to addition of according to each flow data of described multiple flow data between described flow data, do not have competitive data block identifying information after the data block of sending; With repeating transmission synthesis unit, it is according to data block identifying information attached in the reception data block received by this receiving element, carries out repeating transmission synthesis process to the data accepted block and retransmitted data blocks that are attached with identical block identifying information.

(14) in addition, described receiving system can also have re-send request may transmitting element, and this re-send request may transmitting element adds described data block identifying information to the re-send request may for described reception data block, and this re-send request may is sent to this dispensing device.

Invention effect

At least following effect or advantage can be obtained according to the invention described above.

Namely, even if to switch to from MIMO multiplexing transmission as transmission mode the transport stream quantity the situation of non-MIMO multiplexing transmission (MIMO diversity transmission etc.) between dispensing device and receiving system change (minimizing) time, also the competition of data block identification can not be produced, so the mistake in the mistake repeating transmission of the dispensing device of data block and receiving system can be avoided to synthesize between transport stream.Therefore, it is possible to continue to communicate (flow transmission) normally between dispensing device and receiving system.

Accompanying drawing explanation

Fig. 1 is the block diagram of the structure representing mimo transmission system of the first embodiment of the present invention.

Fig. 2 is the block diagram of an example of the process sequence number represented in the lump for illustration of the process sequence number addition method in the mimo transmission system shown in Fig. 1.

Fig. 3 is the figure for illustration of the retransmission process action in the mimo transmission system shown in Fig. 1.

Fig. 4 is the flow chart of the action for illustration of the dispensing device in the mimo transmission system shown in Fig. 1.

Fig. 5 is the figure of the answering method (situation 1) for illustration of the ACK/NACK in the mimo transmission system shown in Fig. 1.

Fig. 6 is the flow chart of the action (situation 1) for illustration of the receiving system in the mimo transmission system shown in Fig. 1.

Fig. 7 is the figure of the answering method (situation 2) for illustration of the ACK/NACK in the mimo transmission system shown in Fig. 1.

Fig. 8 is the flow chart of the action (situation 2) for illustration of the receiving system in the mimo transmission system shown in Fig. 1.

Fig. 9 is the block diagram that the structure of mimo transmission system of the second embodiment of the present invention and an example of process sequence number are shown in the lump.

Figure 10 is the block diagram of an example of the process sequence number illustrated in the lump for illustration of other process sequence number addition methods in the mimo transmission system shown in Fig. 9.

Figure 11 is the figure for illustration of the retransmission process action in the mimo transmission system shown in Fig. 9.

Figure 12 is the flow chart of the action for illustration of the dispensing device in the mimo transmission system shown in Fig. 9.

Figure 13 is the flow chart of the action (situation 1) for illustration of the receiving system in the mimo transmission system shown in Fig. 9.

Figure 14 is the flow chart of the action (situation 2) for illustration of the receiving system in the mimo transmission system shown in Fig. 9.

Figure 15 is the figure for illustration of the retransmission process action in mimo transmission system of the third embodiment of the present invention.

Figure 16 is the figure for illustration of MIMO transmission changing method of the third embodiment.

Figure 17 is the figure for illustration of MIMO transmission changing method of the fourth embodiment of the present invention.

Figure 18 is the figure for illustration of the retransmission process action in mimo transmission system of the fourth embodiment.

Figure 19 is the synoptic chart of mimo transmission system.

Figure 20 is the block diagram of the topology example representing dispensing device in the mimo transmission system shown in Figure 19 and receiving system.

Figure 21 is the flow chart of the action for illustration of the dispensing device in the mimo transmission system shown in Figure 20.

Figure 22 is the flow chart of the action for illustration of the receiving system in the mimo transmission system shown in Figure 20.

Figure 23 is the figure for illustration of the repeating transmission synthesis process in the mimo transmission system shown in Figure 20.

Figure 24 is the figure of the situation of N-channel Stop-and-Wait ARQ when representing that dispensing device in the mimo transmission system shown in Figure 20 and receiving system correspond to PARC.

Figure 25 is the figure of the pilot signal additional example represented in the mimo transmission system shown in Figure 20.

Figure 26 is the block diagram of the cell structure example representing mimo transmission system.

Figure 27 is the figure for illustration of action example when switching to MIMO diversity transmission from MIMO multiplexing transmission in PARC.

Figure 28 is the figure of the problem for illustration of prior art.

Figure 29 is the figure of the problem for illustration of prior art.

Figure 30 is the figure of the problem for illustration of prior art.

Figure 31 is the figure of the problem for illustration of prior art.

Figure 32 is the figure of the problem for illustration of prior art.

Label declaration

1 dispensing device (base station); 11 stream separation units; 12 CRC appendix; 13 coding unit; 14HARQ transmission processing portion (data block identifying information extra cell); 15 sending parts; 16 retransmit control part; 17,17A process sequence number appendix (control unit: antenna identifier generating unit, by group serial number gencration portion); 2 receiving systems (mobile radio station); 21 Signal separator/combining unit (receiving element); 22 HARQ reception processing units (repeating transmission synthesis unit); 23 CRC operational parts; 24 ACK/NACK detection units (re-send request may transmitting element); 25 stream combining units; 26,26A process sequence number dispenser; Tx#1, Tx#2 ..., Tx#n transmitting antenna (antenna sets); Rx#1, Rx#2 ..., Rx#n reception antenna (antenna sets); ATT transmitting antenna; ATR reception antenna.

Embodiment

Hereinafter, with reference to the accompanying drawings of embodiments of the present invention.But, the invention is not restricted to following execution mode, certainly can carry out various distortion without departing from the spirit and scope of the present invention and implement.

(A) explanation of the 1st execution mode

Fig. 1 is the block diagram of the structure representing mimo transmission system of the first embodiment of the present invention, and the mimo transmission system shown in this Fig. 1 is configured to comprise: at least 1 dispensing device 1 with multiple transmitting antenna (antenna sets) Tx#1, Tx#2 ..., Tx#n; With at least 1 receiving system 2 with multiple reception antenna (antenna sets) Rx#1, Rx#2 ..., Rx#n.In addition, dispensing device 1 such as can be used as the transmitting system of base station apparatus, and receiving system 2 can be used as the receiving system of mobile station apparatus.Further, in this example, number of transmit antennas and reception antenna quantity are set to equal number (n), but also can be different.

And, dispensing device 1 is when focusing on its major part, such as be configured to comprise stream separation unit 11, each send stream CRC appendix 12, coding unit 13, HARQ transmission processing portion 14, sending part 15, retransmit control part 16 and process sequence number appendix 17, receiving system 2 when focusing on its major part, such as, is configured to comprise Signal separator/combining unit 21, each HARQ reception processing unit 22 and CRC operational part 23, ACK/NACK detection unit 24, stream combining unit 25 and process sequence number dispenser 26 receiving stream.In addition, in this Fig. 1, ATR represents the reception antenna of dispensing device 1, ATT represents the transmitting antenna of receiving system 2, for convenience of explanation, flow to send to utilize one from the transmitting antenna ATT of receiving system 2 and confirm response (ack/nack signal), and received premised on this confirmation response (ack/nack signal) by the reception antenna ATR of dispensing device 1.

At this, in dispensing device 1, stream separation unit 11 is separated into the transmission stream of each antenna sets Tx#i sending data-signal, CRC appendix 12 is respectively to the described CRC code sending stream additional error and detect, and coding unit 13 is respectively the error correcting code by the transmission stream encryption that addition of this CRC code being the necessity such as Turbo code.

HARQ transmission processing portion 14 carries out HARQ process (blocking) according to each process sequence number to transmission stream and sends sending part 15 to respectively, and this HARQ block (process) is kept in not shown memory temporarily, control to use in order to retransmitting, sending part 15 implements modulation system (such as QPSK or 16QAM comprised based on necessity for the process inputted from each HARQ transmission processing portion 14, 64QAM etc.) modulation, DA changes, to the wireless transmission process of necessity of the frequency inverted (up-conversion) etc. of wireless frequency (RF) signal, and send to receiving system 2 from any one transmitting antenna Tx#i.

Retransmit control part 16 and carry out following control: according to the ack/nack signal from receiving system 2 received by reception antenna ATR, determine whether to need to retransmit, if need to retransmit, then determine the antenna sets Tx#i that retransmit and process, from the described memory in the HARQ transmission processing portion 14 corresponding to the antenna sets Tx#i retransmitting object, read the corresponding process of preservation, and send sending part 15 to.In addition, about the antenna sets Tx#i that should retransmit and process as described later, such as, according to the timing adjustment of the ack/nack signal described above or can determine for the expressing of process sequence number of ack/nack signal.

And, process sequence number appendix 17 is to each HARQ block (data block) the additional process sequence number in each HARQ transmission processing portion 14, in this example, the information with this form of (antenna identifier)+(sequence number) is supplied to HARQ transmission processing portion 14 as process sequence number, thus between each antenna sets Tx#i (each send stream between) not have to compete (repetitions) information, namely send stream identifier and be attached to during transmission flows.Such as, as shown in Figure 2 schematically like that, the process sequence number be attached in the transmission stream of antenna sets Tx#1 utilizes Bit String can be expressed as " 0...00xxx ", the process sequence number be attached in the transmission stream of antenna sets Tx#2 is expressed as " 0...01yyy ", the process sequence number be attached in the transmission stream of antenna sets Tx#n is expressed as " 1...11zzz " (wherein, x, y, z is 0 or 1 respectively).After dispensing device 1 adds this independently process sequence number, transmit to receiving system 2 and send stream.

Namely, HARQ transmission processing portion 14 plays the effect of data block identifying information extra cell, respectively for each stream in multiple stream, process sequence number (data block identifying information) is made to be additional in process (data block), process sequence number appendix 17 plays the effect of control unit, its control HARQ transmission processing portion 14 is to make the process sequence number not competition between each stream be attached in described process, in addition, this process sequence number appendix 17 also plays the effect of antenna identifier generating unit in the lump, the process sequence number of information in the process being attached to this stream of the antenna identifier of the transmitting antenna Tx#i included about stream is supplied to HARQ transmission processing portion 14.

On the other hand, in receiving system 2, Signal separator/combining unit 21 is according to the control from course allocation portion 26, to send from each transmitting antenna Tx#i (i=1 ~ n) and by spatial reuse, the signal received by each reception antenna Rx#i is separated according to each process, can carry out when MIMO diversity point assembling process, HARQ reception processing unit 22 is stored the reception stream (process) obtained by this Signal separator/combining unit 21 together with process sequence number, use in order to retransmitting synthesis process, and the process stored and the repeating transmission process from the same process sequence number of dispensing device 1 are synthesized.

Namely, above-mentioned Signal separator/combining unit 21 plays the effect of receiving element, its receive by dispensing device 1 to each stream addition of do not have competitive process sequence number (comprising the serial number information of antenna identifier) between streams after the process of sending, HARQ reception processing unit 22 plays the effect of retransmitting synthesis unit, it is according to process sequence number additional in the receiving process that received by the Signal separator/combining unit 21 as this receiving element, is carried out repeatings transmission synthesis process addition of the receiving process of same process and repeating transmission process.

CRC operational part 23 implements CRC computing to the reception stream obtained by HARQ reception processing unit 22 respectively, thus carry out error checking, ACK/NACK detection unit 24 generates according to this CRC operation result and confirms answer signal, and send (feedback) to dispensing device 1 from transmitting antenna ATT, specifically, CRC operation result represent normally (OK) time, generate ack signal and feed back to dispensing device 1, when CRC operation result represents abnormal (NG), generate NACK signal and feed back to dispensing device 1.

Wherein, the ACK/NACK detection unit 24 of this example as hereinafter described, to confirming a part (antenna identifier) for the additional described process serial number information of answer signal (ack/nack signal) or whole (process sequence number), and dispensing device 1 can be sent to.That is, the ACK/NACK detection unit 24 of this example plays the effect of re-send request may transmitting element, and it is to sending to dispensing device 1 for re-send request may (NACK signal) the additional antenna identifier of receiving process or process sequence number.

The CRC operation result of each CRC operational part 23 is the stream synthesis of OK by stream combining unit 25, and exports as receiving data.

Further, course allocation portion 26 identifies the process sequence number of receiving process, according to the Signal separator in this process sequence number control signal separation/synthesis portion 21 and synthesis process, to be distributed by this receiving process and to input to either party in each HARQ reception processing unit 22.In addition, in order to identify this process sequence number, in course allocation portion 26, the process sequence number used and the information relevant to its addition method are stored in advance in not shown memory etc., make dispensing device 1 and receiving system 2 share the addition method of process sequence number in process sequence number appendix 17.

Below, use Fig. 3 ~ Fig. 8 that the action of the mimo transmission system of the present embodiment formed as mentioned above is described.

First, in dispensing device 1, stream separation unit 11 is utilized to become the transmission stream of each antenna sets Tx#i by sending data separating, and utilize corresponding CRC appendix 12 to carry out additional CRC code respectively, then utilize coding unit 13 to be encoded into the error correcting code of the necessity such as Turbo code, and be input to HARQ transmission processing portion 14.

In HARQ transmission processing portion 14, respectively HARQ process (blocking) is carried out to the transmission stream inputted from coding unit 13, as shown in Figure 2, additional process sequence number under the control of process sequence number appendix 17, and preserve this HARQ block (process), control use in order to retransmitting, and send sending part 15 to.

Thus, the wireless transmission process that sending part 15 describes before implementing the process inputted from each HARQ transmission processing portion 14, and send to receiving system 2 from any one transmitting antenna Tx#i.Fig. 3 schematically illustrates this situation.This Fig. 3 represents that the antenna sets of transmission and reception is respectively the situation of n=2, represent antenna sets Tx#1, " antenna identifier " of Tx#2 is set to " 0 " respectively, " 1 ", " sequence number " of HARQ block is set to 0, 1, 2, ..., to the process sent from antenna sets Tx#1 successively additional " 0-0 ", " 0-1 ", " 0-2 ", ... such process sequence number, to the process sent from antenna sets Tx#2 successively additional " 1-0 ", " 1-1 ", " 1-2 ", ... such process sequence number, and send to the situation of receiving system 2 (towards the solid arrow below paper in reference Fig. 3).

In addition, dispensing device 1 switch from MIMO multiplexing transmission to MIMO diversity transmission as produced the situation of (switching hereinafter sometimes referred to transmission mode) like that (symbol 500 with reference to Fig. 3) after the minimizing of use antenna sets quantity, identical with above-mentioned explanation, also maintain the addition method of the above-mentioned process sequence number of process sequence number appendix 17, carry out stream and send.At this, the stream beyond main antenna group Tx#i also can omit described antenna identifier, carry out the transmission and reception of process at the end of sending.Wherein, so-called " main antenna group " refers to maintain the antenna sets (following identical) used before and after transmission mode switches, and refers to antenna sets Tx#2 in the example of fig. 3.

Fig. 4 represents the action flow chart of the dispensing device 1 comprising this option.Namely, dispensing device 1 utilizes process sequence number appendix 17 according to described additional process sequence number above and carries out stream and sends (step S11), utilize repeating transmission control part 16 to monitor and determine whether that creating transmission mode switches (change to MIMO diversity transmission) (step S12), if do not produce transmission mode to switch (step S12 is "No"), then retransmit control part 16 and control process sequence number appendix 17 and HARQ transmission processing portion 14, so that the stream proceeding addition of process sequence number sends.

On the other hand, if create transmission mode to switch (step S12 is "Yes"), then retransmit control part 16 and determine whether do not exist except main antenna group Tx#i data (process) (the step S13) that send, if existed (step S13 is "No"), then identical with above-mentioned steps S11, control process sequence number appendix 17 and HARQ transmission processing portion 14, so that by process sequence number appendix 17 additional process sequence number, and carry out stream transmission (step S14).

On the other hand, if there are not the data (process) (step S13 is "Yes") that send except main antenna group Tx#i, then retransmit control part 16 and control process sequence number appendix 17 and HARQ transmission processing portion 14, eliminate the key element of described process sequence number and the process sequence number of described antenna identifier so that additional, and carry out stream transmission (step S15).

On the other hand, in receiving system 2, utilize Signal separator/combining unit 21 according to the control from course allocation portion 26, the signal received is separated according to each process, and distributes to either party in each HARQ reception processing unit 22 by each reception antenna Rx#i.

In HARQ reception processing unit 22, respectively the receiving process from this Signal separator/combining unit 21 is stored together with process sequence number, use in order to retransmitting synthesis process, by stored process and repeating transmission process synthesis (when not retransmitting process, directly exporting receiving process) retransmitting the same process sequence number of coming from dispensing device 1.

Then, in the CRC operational part 23 of correspondence, CRC computing is implemented to the receiving process exported from HARQ reception processing unit 22, generate the confirmation answer signal (ack signal or NACK signal) corresponding with this operation result by ACK/NACK detection unit 24, this signal is fed back to dispensing device 1 (arrow with reference in Fig. 3 above paper) via transmitting antenna ATT.Wherein, ACK/NACK detection unit 24 makes this confirmation answer signal comprise antenna identifier or process sequence number.

In addition, for the normal process of above-mentioned CRC operation result, in stream combining unit 25, receive the process synthesis of stream by itself and other, and export as the data be received normally, for the process of CRC operation result exception, be not input in stream combining unit 25 and discarded.

In addition, process sequence number appendix 17 and HARQ transmission processing portion 14 is controlled in dispensing device 1, if to receive ack signal as confirmation answer signal from receiving system 2, send new process, if receive NACK signal, then retransmitting in receiving system 2 is abnormal process.In addition, the process of new process/should retransmit is determined according to the antenna identifier comprised in the confirmation answer signal received or process sequence number.

Thus, the process sequence number process identical with process sequence number during previous transmission is also retransmitted when the process of repeating transmission by HARQ transmission processing portion 14, receiving system 2 is controlled by the identification of the receiving process sequence number in course allocation portion 26, the distribution of receiving process, when as switched to the non-MIMO multiplexing transmission such as MIMO diversity transmission or MIMO single transport from MIMO multiplexing transmission, even if send fluxion amount (number of transmit antennas) variation, the synthesis of correct process also can be carried out in HARQ reception processing unit 22.

Such as, consider that the timing utilizing symbol 500 to represent in figure 3 creates the switching to MIMO diversity transmission, number of transmit antennas is reduced to the situation of 1 (just antenna sets Tx#2) from 2, receiving system 2 after this switching no matter from dispensing device 2 receive which process sequence number repeating transmission process (with reference to Fig. 3 towards the double arrows below paper), the distribution of correct process can both be carried out by course allocation portion 26, and carry out the synthesis between the synthesis of correct process, process that namely process sequence number is identical.That is, the destruction (foregoing problems 1 can be solved) of the conformability of synthesizing can be prevented.

Further, study, also can solve foregoing problems 2 thus according to the answering method of situation 1,2 couples of ACK/NACK of the following stated, the mistake namely producing process in dispensing device 1 retransmits the problem making to retransmit the process that should retransmit.

(situation 1) receives the situation (Fig. 5, Fig. 6) of ack/nack signal by timing adjustment

Fig. 5 represents the schematic diagram being equivalent to Fig. 3 in this situation 1.As shown in Figure 5, even if after creating transmission mode switching (change to MIMO diversity transmission) (reference marks 500), receiving system 2 also utilizes the antenna identifier of (adding) each antenna sets, carries out the reply confirming answer signal (ack/nack signal).At this, the meaning of " utilization " antenna identifier does not refer to that additional antenna identifier is to reply ack/nack signal expressly, and refer to such as when even if main antenna group is confirmed as one, dispensing device also indicates the frequency band of the ack/nack signal of each antenna sets to receiving system, receiving system utilizes this frequency band to reply ACK/NACK.Therefore, dispensing device, when receiving ack/nack signal, analyzes its frequency band, just can identify it is ACK/NACK for which antenna sets.On the other hand, the meaning of " adding " antenna identifier as shown in Figure 5, refers to ack/nack signal additional antenna identifier expressly.

Such as in Figure 5, if focus on the process " 0-2 " producing and send from the antenna sets Tx#1 (main antenna group is Tx#2) of dispensing device 1 after transmission mode switches, then receiving system 2 utilizes ACK/NACK detection unit 24 generation to addition of sequence number key element (part) the i.e. signal of antenna identifier " 0 " of this receiving process " 0-2 " as the response confirmation signal for this process " 0-2 ", replies to dispensing device 1.

Thus, dispensing device 1 is with synchronous (namely with the reply timing acquisition at least just for the confirmation answer signal of the process of transmission between receiving system 2, dispensing device 1 carrys out confirmation of receipt answer signal by the timing adjustment between receiving system 2) premised on, repeating transmission control part 16 can be utilized to identify described confirmation answer signal for process " 0-2 ", thus process " 1-2 " can not be retransmitted mistakenly, can correctly retransmit process " 0-2 " from main antenna group Tx#2.

In addition, when dispensing device 1 carries out the transmission and reception of process according to omission antenna identifier noted earlier (when namely can transmit the whole process outside main antenna group Tx#2), for the reply confirming response, even if omit antenna identifier to send confirmation response, owing to having carried out timing adjustment, so it is confirmation answer signal for which process that dispensing device 1 also can identify.

Fig. 6 represents the action flow chart of the receiving system 2 in this situation 1.

Namely, receiving system 2 monitors and determines whether that creating transmission mode switches (change to MIMO diversity transmission) (step S21), if do not produce transmission mode to switch (step S21 is "No"), then generated by ACK/NACK detection unit 24 and addition of the sequence number key element of receiving process and the confirmation answer signal of antenna identifier, and reply to dispensing device 1.When this confirmation answer signal is NACK signal, keeping receiving process by HARQ reception processing unit 22, using (step S22) in order to retransmitting synthesis.

On the other hand, when creating transmission mode and switching (step S21 is "Yes"), receiving system 2 utilizes course allocation portion 26 to carry out the separation (identification of process sequence number) (step S23) of receiving process, determines whether to be attached with antenna identifier (step S24).Result, if be attached with antenna identifier (step S24 is "Yes"), then receiving system 2 is identical with the situation of above-mentioned steps S22, generate and addition of the sequence number key element of receiving process and the confirmation answer signal of antenna identifier, and reply to dispensing device 1, and when this confirmation answer signal is NACK signal, keeping receiving process by HARQ reception processing unit 22, using (step S25) in order to retransmitting synthesis.

On the other hand, when there is no additional antenna identifier (step S24 is "No"), receiving system 2 is owing to having carried out timing adjustment, so confirm that antenna identifier is omitted in the reply of response, and reply to dispensing device 1, and when this confirmation answer signal is NACK signal, keeping receiving process by HARQ reception processing unit 22, using (step S26) in order to retransmitting synthesis.

Like this, this situation 1 time, as long as create transmission mode to switch (change to MIMO diversity transmission), need to identify each transmission process between each antenna sets Tx#i (Rx#i), just to confirming the answer signal only information element of additional receptive process sequence number and antenna identifier, its amount of information is suppressed to Min. and replies to dispensing device 1 simultaneously, the whole processes beyond main antenna group Tx#2 can be transmitted, if do not need to identify each transmission process between each antenna sets Tx#i (Rx#i), then omit the additional of this antenna identifier, so effective utilization of the Radio Resource between dispensing device 1 and receiving system 2 can be realized.

(situation 2) expressly additional process sequence number replys the situation (Fig. 7, Fig. 8) of ack/nack signal

Fig. 7 represents the schematic diagram being equivalent to Fig. 3, Fig. 5 in this situation.As shown in Figure 7, even if after creating transmission mode switching (change to MIMO diversity transmission) (reference marks 500), owing to not carrying out timing adjustment between dispensing device and receiving system, thus receiving system 2 expressly additional process sequence number reply ACK/NACK.

Such as, this situation 2 times, in the figure 7, if focus on the process " 0-2 " creating and send from the antenna sets Tx#1 (main antenna group is Tx#2) of dispensing device 1 after transmission mode switches, then receiving system 2 utilizes ACK/NACK detection unit 24 generation to addition of the signal of the process sequence number of this receiving process " 0-2 " as the confirmation answer signal for this process " 0-2 ", replies to dispensing device 1.

Thus, no matter between dispensing device 1 and receiving system 2 whether just for the confirmation answer signal of the process of transmission reply timing acquisition synchronously, repeating transmission control part 16 can both be utilized to identify the reply (being the reply for process " 0-2 " in this example) that described confirmation answer signal is which process for which antenna sets Tx#i, thus can not wrong repeating transmission process " 1-2 ", can correctly retransmit process " 0-2 " from main antenna group Tx#2.

Fig. 8 represents the action flow chart of the receiving system 2 in this situation 2.

Namely, receiving system 2 monitors and determines whether that creating transmission mode switches (change to MIMO diversity transmission) (step S31), if do not produce transmission mode to switch (step S31 is "No"), then generated the confirmation answer signal that addition of receiving process sequence number by ACK/NACK detection unit 24, and reply to dispensing device 1.When this confirmation answer signal is NACK signal, keeping receiving process by HARQ reception processing unit 22, using (step S32) in order to retransmitting synthesis.

On the other hand, when creating transmission mode and switching (step S31 is "Yes"), receiving system 2 carries out the separation (identification of process sequence number) (step S33) of receiving process by course allocation portion 26, determines whether to be attached with antenna identifier (step S34).Result, if be attached with antenna identifier (step S34 is "Yes"), then receiving system 2 is identical with the situation of above-mentioned steps S32, additional receptive process sequence number also replys confirmation answer signal to dispensing device 1, and when this confirmation answer signal is NACK signal, keeping receiving process by HARQ reception processing unit 22, using (step S35) in order to retransmitting synthesis.

On the other hand, when there is no additional antenna identifier (step S34 is "No"), namely, dispensing device 1 can transmit the whole processes beyond main antenna group Tx#i, and when omitting antenna identifier to the transmission and reception of the process of carrying out, due to the additional of antenna identifier can be omitted, so receiving system 2 not additional antenna identifier, utilize the sequence number of main antenna group Tx#2 (the process sequence number identical with the mode in the past eliminating antenna identifier) to reply to dispensing device 1 and confirm answer signal, and when this confirmation answer signal is NACK signal, receiving process is kept by HARQ reception processing unit 22, (step S36) is used in order to retransmitting synthesis.

Like this, when this situation 2, as long as create transmission mode to switch (change to MIMO diversity transmission), need to identify each transmission process between each antenna sets Tx#i (Rx#i), just reply to dispensing device 1 to confirmation answer signal additional receptive process sequence number, even if so when not having just synchronous for the reply timing acquisition of confirmation answer signal of the process of transmission between receiving system 2, also can correctly identify the process retransmitted in dispensing device 1, can reliably suppress the mistake of repeating transmission process to be retransmitted.

And, when this situation 2, the whole processes beyond main antenna group Tx#2 can be transmitted, if do not need to identify transmission process between each antenna sets Tx#i (Rx#i), then omit the additional of this transmitting antenna, so effective utilization of the Radio Resource between dispensing device 1 and receiving system 2 can be realized.

(B) explanation of the 2nd execution mode

Fig. 9 is block diagram that represent the structure of mimo transmission system of the second embodiment of the present invention, that be equivalent to Fig. 2, mimo transmission system (dispensing device 1 and receiving system 2) shown in this Fig. 9 is compared with the structure shown in Fig. 1 with Fig. 2, difference is, arrange process sequence number appendix 17A and course allocation portion 26A replace before describe process sequence number appendix 17 and course allocation portion 26.In addition, other structures are identical or the same with the structure utilizing Fig. 1 with Fig. 2 to describe, in fig .9, identical with Fig. 2, omit the diagram of a part (CRC operational part 22 and stream combining unit 25) for a part (stream separation unit 11, CRC operational part 12 and coding unit 13) for the inscape of dispensing device 1 and the inscape of receiving system 2 respectively.

At this, the process sequence number appendix 17A of this example is to the HARQ block (process) obtained in HARQ transmission processing portion 14, not have competitive mode independence additional process sequence number between whole antenna sets Tx#i, such as, can consider following (1) or the addition method shown in (2).

(1) as shown in Figure 9, add from antenna sets Tx#1 to antenna sets Tx#n according to ascending order (also can be descending), after determining the process sequence number for the stream of last antenna sets Tx#n, the method for ascending order ground additional process sequence number from initial antenna sets Tx#1 again.That is, whole antenna sets Tx#i is repeated to the method for additional a series of process sequence number.Such as, process sequence number for antenna sets Tx#1 utilizes Bit String to be expressed as " ... 00000 ", process sequence number for antenna sets Tx#n is expressed as " ... 00111 ", and the process sequence number after antenna sets Tx#1 is expressed as " ... 01000 ", the process sequence number after antenna sets Tx#n is expressed as " ... 01111 ".

(2) as shown in Figure 10, to the method for each antenna sets Tx#i according to a series of process sequence numbers of ascending order (also can be descending) additional independently (not competition).Such as, the process sequence number of antenna sets Tx#1 be " ... 00000 ~ ... 00111 ", the process sequence number of antenna sets Tx#2 be " ... 01000 ~ ... 01111 ", the process sequence number of antenna sets Tx#3 be " ... 10000 ~ ... 11111 ".

Namely, process sequence number appendix (control unit) 17A of this example is in order to realize additional control that is identical with the 1st execution mode, that do not have competitive process sequence number between streams, also the effect by group serial number gencration portion is played, by a series of serial number information according to each flow point group, for this each stream, the serial number information in corresponding group is supplied to HARQ transmission processing portion 14 as the process sequence number that should be attached in transmission process (data block identifying information).

In addition, no matter in which kind of situation of above-mentioned (1) and (2), in order to avoid the problem identical with the 1st execution mode, all need the addition method sharing process sequence number between dispensing device 1 and receiving system 2.

Namely, in order to identify this process sequence number, in the course allocation portion 26A of receiving system 2, in not shown memory etc., be stored in advance in the process sequence number and the information relevant to this addition method that use in process sequence number appendix 17A, between dispensing device 1 and receiving system 2, share the addition method of process sequence number.Thus, course allocation portion 26A can identify the process sequence number of receiving process, and according to the Signal separator in this process sequence number control signal separation/synthesis portion 21 and synthesis process, this receiving process is distributed and inputs to either party in each HARQ reception processing unit 22.

Below, use Figure 11 ~ Figure 14 that the action of the mimo transmission system of the present embodiment formed as mentioned above is described in the lump.

First, in dispensing device 1, send data and flowed by the transmission of flowing separation unit 11 and be separated into each antenna sets Tx#i, and be addition of CRC code by the CRC appendix 12 of correspondence respectively, then be encoded into the error correcting code of the necessity such as Turbo code by coding unit 13, and input HARQ transmission processing portion 14.

In HARQ transmission processing portion 14, respectively HARQ process (blocking) is carried out to the transmission stream inputted from coding unit 13, as shown in fig. 9 or 10, additional that provided by process sequence number appendix 17A, between antenna sets Tx#i, do not have competitive process sequence number (the step S41 of Figure 12), and keep this HARQ block (process) to control use in order to retransmitting, and send sending part 15 to.

Thus, the wireless transmission process that sending part 15 describes before implementing the process inputted from each HARQ transmission processing portion 14, and send to receiving system 2 from any one transmitting antenna Tx#i.Figure 11 schematically illustrates this situation.This Figure 11 is the figure of the Fig. 3 being equivalent to the 1st execution mode, represent that the antenna sets of transmission and reception is respectively n=2, and be suitable for the situation of the addition method shown in Fig. 9, show the process sent from antenna sets Tx#1 successively attached Plus "0", " 2 ", the even number process sequence number that " 4 " are such, independently (do not have competitive) to the process sent from antenna sets Tx#2 is additional successively with the process sequence number for antenna sets Tx#1, " 1 ", " 3 ", the odd number process sequence number that " 5 " are such, and send to the situation of receiving system 2 (towards the solid arrow below paper in reference Fig. 9).

In addition, in the present embodiment, even if dispensing device 1 after using antenna sets quantity to reduce as (symbol 500 with reference to Figure 11) situation creating transmission mode switching, also same as described above, the addition method of the above-mentioned process sequence number of maintenance process sequence number appendix 17A, and carry out stream transmission.

In receiving system 2, such as, in situation shown in Figure 11, have received process " 4 " and process " 5 ", each process sequence number can be identified by course allocation portion 26A, and distribute to correct antenna sets Rx#i.Therefore, switch even if create transmission mode, the synthesis between the process also can carrying out synthesis, i.e. the same process sequence number of correct process by HARQ reception processing unit 22.That is, the destruction (foregoing problems 1 can be solved) of the conformability of synthesizing can be prevented.

And, identical with the 1st execution mode in the present embodiment, shown in following situation 1,2, the answering method of ACK/NACK is studied, also can solve foregoing problems 2 thus, the mistake namely producing process in dispensing device 1 retransmits the problem that the process that should retransmit can not be retransmitted.

(situation 1) receives the situation (Figure 13) of ack/nack signal by timing adjustment

Receiving system 2 is after creating transmission mode switching (change to MIMO diversity transmission) (symbol 500 with reference in Figure 11), as the 1st execution mode 1, utilize the antenna identifier of (adding) each antenna sets, carry out the reply confirming answer signal (ACK/NACK).At this, the meaning of " utilization " and " adding " antenna identifier is identical with the 1st execution mode.

In addition, after switching to MIMO diversity, in the 1st execution mode, mean when receiving system receives the process sequence number not having additional antenna identifier, only send the process of self-consistent antenna group.But, in the 2nd embodiment, due to not to the process sequence number additional antenna identifier received, so when passing through certain period (T), dispensing device 1 only sends process from main antenna group (referring to antenna sets Tx#2 in case of fig. 11).Therefore, after elapsed time T, receiving system 2, for confirming that the reply of response can omit antenna identifier, only can utilize the timing information of main antenna group to reply to dispensing device 1 and confirm answer signal.

Figure 13 represents the action flow chart of the receiving system 2 in this situation 1.

As shown in Figure 13, receiving system 2 monitors and determines whether that creating transmission mode switches (change to MIMO diversity transmission) (step S51), if do not produce transmission mode to switch (step S51 is "No"), generate by ACK/NACK detection unit 24 the confirmation answer signal that utilization (has added) antenna identifier, and reply to dispensing device 1.In addition, when this confirmation answer signal is NACK signal, keeping receiving process by HARQ reception processing unit 22, using (step S52) in order to retransmitting synthesis.

On the other hand, when creating transmission mode and switching (step S51 is "Yes"), receiving system 2 utilizes course allocation portion 26A to carry out the separation (identification of process sequence number) (step S53) of receiving process, and determines whether to have passed through time T (step S54).Result, if there is no elapsed time T (step S54 is "No"), then receiving system 2 is identical with the situation of above-mentioned steps S52, generate the confirmation answer signal utilizing and (added) antenna identifier, and reply to dispensing device 1, and when this confirmation answer signal is NACK signal, keeping receiving process by HARQ reception processing unit 22, using (step S55) in order to retransmitting synthesis.

On the other hand, if have passed through time T (step S54 is "Yes"), then receiving system 2 utilizes the timing information of main antenna group, reply to dispensing device 1 and confirm answer signal, and when this confirmation answer signal is NACK signal, keeping receiving process by HARQ reception processing unit 22, using (step S56) in order to retransmitting synthesis.

Like this, this situation 1 time, when creating transmission mode and switching (change to MIMO diversity transmission), as long as need to identify each transmission process between each antenna sets Tx#i (Rx#i), just utilize (adding) each antenna identifier, reply to dispensing device 1 and confirm answer signal, the whole processes beyond main antenna group Tx#2 can be transmitted, if do not need to identify each transmission process between each antenna sets Tx#i (Rx#i), then can only utilize the timing information of main antenna group to reply and confirm response, so effective utilization of the Radio Resource between dispensing device 1 and receiving system 2 can be realized.

(situation 2) expressly additional process sequence number replys the situation (Figure 14) of ack/nack signal

Even if receiving system 2 is after creating transmission mode switching (change to MIMO diversity transmission) (symbol 500 with reference in Figure 11), also additional process sequence number replys ACK/NACK expressly.Such as, in fig. 11, if focus on the process " 4 " creating and send from the antenna sets Tx#1 (main antenna group is Tx#2) of dispensing device 1 after transmission mode switches, then receiving system 2 utilizes ACK/NACK detection unit 24 generation to addition of the signal of the process sequence number of this receiving process " 4 " as the response confirmation signal for this process " 4 ", replies to dispensing device 1.

Thus, dispensing device 1 can utilize repeating transmission control part 16 to identify that described confirmation answer signal is the reply (being the reply for process " 4 " in this example) of which process for which antenna sets Tx#i, thus can not wrong repeating transmission process " 5 ", can correctly retransmit process " 4 " from main antenna group Tx#2.

In addition, this situation 2 times, after generation transmission mode switches, if having passed through certain period (T), then dispensing device 1 only sends process from main antenna group, but after elapsed time T, dispensing device 2 can not omit process sequence number to send process.This situation 2 times, after generation transmission mode switches, even if only send process from main antenna group through certain period (T), dispensing device 1, also different from situation 1, Timing Synchronization can not be obtained, so need additional process sequence number to reply to confirm response.

Figure 14 represents the action flow chart of the receiving system 2 in this situation 2.

Namely, receiving system 2 monitors and determines whether that creating transmission mode switches (change to MIMO diversity transmission) (step S61), if do not produce transmission mode to switch (step S61 is "No"), then generated the confirmation answer signal that addition of receiving process sequence number by ACK/NACK detection unit 24, and reply to dispensing device 1.In addition, when this confirmation answer signal is NACK signal, keeping receiving process by HARQ reception processing unit 22, using (step S62) in order to retransmitting synthesis.

On the other hand, when creating transmission mode and switching (step S61 is "Yes"), receiving system 2 utilizes course allocation portion 26A to carry out the separation (identification of process sequence number) (step S63) of receiving process, no matter whether have passed through time T, all generate the confirmation answer signal that addition of receiving process sequence number, and reply to dispensing device 1, and when this confirmation answer signal is NACK signal, keeping receiving process by HARQ reception processing unit 22, using (step S66) in order to retransmitting synthesis.

Like this, this situation 2 times, when creating transmission mode and switching (change to MIMO diversity transmission), as long as need to identify each transmission process between each antenna sets Tx#i (Rx#i), all reply to dispensing device 1 to confirmation answer signal additional receptive process sequence number, even if so do not have between receiving system 2 just for send process confirmation answer signal reply timing obtain synchronous, also can correctly identify the process retransmitted in dispensing device 1, can reliably suppress the mistake of repeating transmission process to be retransmitted.

(C) explanation of the 3rd execution mode

In the above-mentioned 1st and the 2nd execution mode, for the addition method of process sequence number, show and adding according to the mode can not competed between each antenna sets, even if thus when switching to non-MIMO multiplexing transmission from MIMO multiplexing transmission, also the synthesis of correct process can be carried out, prevent the mistake of process from retransmitting, and the transmission carrying out flowing can be continued without interruption, but in the present embodiment, also flow transmission can be made even if show to continue the method for carrying out communicating without interruption process sequence number being attached to independently according to each antenna sets to send in existing PARC in stream or precoding.

In the present embodiment, focus on create at first transmission mode switch time, due in the antenna sets beyond main antenna group residue have process and produce mistake retransmit situation.Therefore, retransmit to prevent mistake, when switching to such as MIMO diversity transmission from MIMO multiplexing transmission, according to process (not sending process) amount remaining in the antenna sets beyond main antenna group, make the constant time lag of this switching (minimizing of fluxion amount controls) (such as after the transmission of residue process all terminates, implementing this switching).

Figure 15 represents the communications status between dispensing device 1 when being suitable for the method and receiving system 2.At Fig. 5 and Fig. 7, Tu11Zhong, when detecting that receiving system 2 moves from MIMO multiplexing transmission region 302 (with reference to Figure 26) to non-MIMO multiplexing transmission region (MIMO diversity region) 301,303, in dispensing device 1, implement the switching (reference marks 500) to MIMO diversity transmission at once.

On the other hand, in fig .15, even if above-mentioned movement (regional change) detected in the timing utilizing symbol 600 to represent, owing to there is residue process " 2 " at this time point in antenna sets Tx#1, so dispensing device 1 proceeds MIMO multiplexing transmission, be in fact (such as utilize the timing that symbol 700 represents) after the end of transmission of residue process " 2 " from MIMO multiplexing transmission to the switching of MIMO diversity transmission.Thus, even if unlike 1st execution mode and the 2nd execution mode, use special process sequence number addition method, also can by more simply controlling, the not interrupt flow transmission and proceed to communicate when generation pattern switches.

But, in the method, before the repeating transmission success of residue process " 2 ", MIMO diversity can not be switched to.Therefore, such as shown in Figure 16, except the switching threshold (threshold value A about wireless quality) of MIMO diversity transmission, process is had also to switch to the threshold value (the threshold value B < A about wireless quality) of MIMO diversity even if also arrange residue.Further, dispensing device 1 when the wireless quality of receiving system (mobile radio station) 2 is between threshold value A and threshold value B, if there is residue process, then proceed MIMO multiplexing transmission, if wireless quality is lower than threshold value B, then no matter with or without remaining data, all switch to MIMO diversity transmission.

In addition, a function of the repeating transmission control part 16 described before above function such as can be mounted for, also can be mounted for independently control part (transmission mode switching timing control part).Further, such as can utilize the known method reception quality informations such as SIR and CQI measured by receiving system 2 being fed back to dispensing device 1 etc., make dispensing device 1 can grasp the wireless quality (following identical) of receiving system 2.

(D) explanation of the 4th execution mode

At this, identical with the 3rd above-mentioned execution mode, illustrating according to each antenna sets process sequence number being attached to independently in the PARC in the past sent in stream, continuing the additive method carrying out flow transmission without interruption.

In present embodiment 4, also identical with the 3rd execution mode, when focusing on the switching of generation transmission mode, produce the situation that mistake is retransmitted because residue in the antenna sets beyond main antenna group has process.Namely, when carrying out pattern from MIMO multiplexing transmission to non-MIMO multiplexing transmission (MIMO diversity transmission) and switching, the threshold value (threshold value A) of switching is greater than at the wireless quality of receiving system 2, but be less than other threshold values (threshold value C) (i.e. threshold value C > threshold value A > threshold value B), and when not sending data (process) in antenna sets beyond main antenna group, dispensing device 1 does not wait for that wireless quality reaches below threshold value A, and just switches to MIMO diversity transmission after this time point.

Figure 17 represents the setting example of above-mentioned threshold value A, C.Further, the dispensing device 1 when Figure 18 represents the method being suitable for this example and the communications status between receiving system 2.

Following situation shown in Figure 18: after detecting that receiving system 2 moves (reference marks 600) from MIMO multiplexing transmission region to non-MIMO multiplexing transmission region (MIMO diversity region), dispensing device 1 receives the NACK signal (with reference to dotted arrow 610) of the process " 2 " for antenna sets Tx#1, so the repeating transmission of the process of generation " 2 ", after replied the ack signal (with reference to solid arrow 620) for this repeating transmission process to dispensing device 1, whole residue processes of transmitting antenna group Tx#1 at once.After not remaining the time point of process like this, if the wireless quality of receiving system 2 is between threshold value A and threshold value C, then dispensing device 1 switches to MIMO diversity transmission in the timing utilizing symbol 700 to represent at once.

In addition, a function of the repeating transmission control part 16 described before above function such as can be mounted for, also can be mounted for independently control part (transmission mode switching timing control part).Further, as long as above-mentioned threshold value A, threshold value B, threshold value C meet relationship threshold C > threshold value A > threshold value B, just can set simultaneously.

Utilizability in industry

Specifically describing as above, according to the present invention, in a wireless communication system, even if when transport stream number change (minimizing) between dispensing device and receiving system, also the conformability of the data block retransmitting synthetic object can be maintained, normally can proceed communication, so exceedingly useful in wireless communication technology field.

Claims (2)

1. the transfer control method in wireless communication system, is characterized in that,

Multiple data block can be sent to receiving system according to each stream from the dispensing device with multiple transmitting antenna in this wireless communication system,

This transfer control method comprises following process:

Described dispensing device sends for preventing in multiple not homogeneous turbulence competition between stream and for preventing the process sequence number of competing between the data block in each stream to described receiving system on a control channel;

In described receiving system, according to described process sequence number, synthesize by the described data block received and retransmitted data blocks that addition of identical described process sequence number.

2. transfer control method according to claim 1, it is characterized in that, described dispensing device sends the described process sequence number comprising antenna identifier by described control channel, wherein said antenna identifier is relevant to the described transmitting antenna that any one sends described data block.