Specification

Transmission control method and transmission apparatus and receiving apparatus art in a wireless communication system

[0001] The present invention relates to a transmission control method and transmission apparatus and a receiving equipment in a wireless communication system, in particular, a technique suitable for use in MIMO (Multi Input Multi Output) retransmission in the transmission control technique.

Background technique

[0002] In mobile communication systems such as mobile phones, now from a force OFDMA (Orthogonal F requency Division Multiple Access) scheme third generation system by CDMA (Code Division Multiple Acc ess) method is to start the service as a base high-speed communication can become underway consideration of the next generation mobile communication system Ru (see below non Patent literature 1).

[0003] Therefore, MIMO have been proposed as a powerful technique as a technique for speeding up the transmission rate. It shows an outline of a MIMO transmission system in Figure 19. MIMO transmission system shown in FIG. 19, a plurality of transmit antennas (antenna systems) Tx # l, Τχ # 2, · ··, and Τχ # η transmitting apparatus 100 (eta is the integer of 2 or more) having a plurality of receive antennas (antenna systems) Rx # l, Rx # 2, · ··, it is configured to include a receiving device 200 having a Rx # n, parallel each transmit antenna Txffi (i = l ~n) force different data streams by transmitting to a spatial multiplexing transmission technique for increasing a transmission capacity in proportion to the number of transmit antennas n. State different transmit antennas Txffi is arranged so as to be uncorrelated with each other, the data stream transmitted from each transmit antenna Txffi is that through the independent fading propagation path, intermingled among other data streams and Availability in is received by the receiving antenna Rxffi.

[0004] Examples implementation of this MIMO transmission system, for example, as shown in FIG. 20, there is a method of independently for each antenna performs stream processing. For example, PARC is not performed precoding (Preco ding) (Per Antenna Rate Control) (see below Non Patent Literature 2), and the like PSRC performing precoding (Per Stream Rate Control) (see below Non Patent Literature 3) .

[0005] Specifically, the system shown in FIG. 20, for example, as the transmission device 100, a stream partial release section 101, a CRC adding unit 102, the coding unit 103 and the HARQ processing unit 104 for each transmission stream, transmission and parts 105, is configured to include a retransmission control unit 106, as a receiving device 200, for example, the signal separating 'synthesizing unit 201, a HARQ processing unit 202 and the CRC calculation section 203 for each received stream, a ACKZNACK determination unit 204 It is configured to include a stream synthesizing unit 205. Incidentally, ATR receiving antenna of the transmitting device 100, ATT denotes the transmit antenna of the receiving apparatus 200, respectively, in this example, for convenience, ACKZNACK (Acknowledg ement / Negative Acknowledgement) signal (acknowledgment signal) transmission antennas ATT it represents is received at the transmit and receive antenna ATR from.

[0006] Then, the transmitting apparatus (hereinafter, the transmitting side also referred) 100 may operate according Furochiya one preparative shown in FIG. 21, the receiving apparatus (hereinafter also referred to as the receiving side) 200, for example flow one shown in FIG. 22 It operates according to the chart.

[0007] That is, in transmitting apparatus 100, the transmission data is separated by the stream separation section 101 to transmit streams of each antenna system column Txffi (step A1), for each transmission stream of antenna systems Txffi, for error detection the CRC (Cyclic Redundant the Check) code is added by CRC Tsukeka radical 26 102 (step A2), the code I spoon data streams for bit error correction is performed at the marks Goka unit 103, the retransmission control after HARQ (Hybrid Automatic Repeat re Quest) process is performed in the HARQ processing unit 104 (step A4), the transmitting antenna Txffi for transmitting HARQ block (process) is selected in the transmission section 105, modulated to the receiving It is transmitted to the device 200. Here, (for ye s in step A5) When using a pre-coding (in the case of no in scan Tetsupu A5) When the force PARC each process can select a plurality of transmit antennas Txffi, transmitting antenna Txffi predetermined is the force transmitted.

[0008] On the other hand, the receiving apparatus 200, as shown in FIG. 22, when the signal transmitted from the transmitting apparatus 100 is received by the receiving antenna Rxffi, separation of the received signal in the signal separation and synthesis section 201 ' synthesis is performed (step B1), the received signal (process) determines whether the retransmission process force not (step B2). As a result, if the retransmission process (if yes in step B2), the receiving apparatus 200, at the HARQ processing unit 202, and holds the received signal and the previous reception time, the received signal of the same process Ru It was synthesized (step B3). At CRC calculator 20 3, to detect a bit error by examining the CRC attached to each process (Step-up B4). Incidentally, (in the case of no at step B2) This case received process is not retransmission process is synthesized by HARQ processing unit 202 without performing performs bit error detection by the CRC calculation section 203 (step B4).

[0009] Then, at ACKZNACK determination unit 204, if the bit error is detected (the case of yes at step B5) holds the receive process returns a NACK signal to the transmitting apparatus 100 by transmitting antenna ATT ( step B6), if the error was Chikaratsu such is detected (the case of no at step B5) to pass the process to the upper layer by replying to the transmitting apparatus 100 by transmitting antennas ATT an ACK signal (step B7). Incidentally, the detected such ChikaraTsuta received signal of each stream error is output after being synthesized in the final stream synthesizing unit 205.

[0010] In this series of processes, important functions for high-speed communication is HARQ.

HARQ is automatic repeat request (ARQ) and error correction coding (FEC: Forward Error Correction) is a ARQ scheme that combines. Specifically, the addition of error detection Bruno ^ Tibitto the block of information bits in the transmission side 100 performs error correcting code I spoon, transmits the whole or part. If the retransmission occurs, among the coded bits for the current block, retransmitting all or part.

[0011] The receiving side 200, of the retransmission block, the corresponding row of the synthesis process for each bit of ヽ each existing block again performs error correction and error detection processing by using the resulting building block. Such recipient 200 in the until an error of the block is eliminated in a range of a predetermined upper limit number of times, repeating the trial of the decoding process by ACKZNACK Responded retransmission to the sender 100.

[0012] In the next generation mobile communication, in particular applied N-channel Stop- and-Wait ARQ (see below Non Patent Literature 4). Here, N is expressed integers, expresses the number of blocks (number of processes) that can be transmitted simultaneously. The process simultaneously transmitted, retransmission control by the Stop and W ait for each process is performed.

In [0013] FIG. 23 shows an outline of a N-channel Stop- and- Wait ARQ.

Each process, the wireless transmission unit sections: sent in (TTI Transmission Time Interval), is identified by the identifier of the process number N. Shows the case of a number of processes N = 5 in FIG. 23 (0-4), therefore, it corresponds to the case of 5-channel Stop-and-Wait ARQ. In FIG. 23, for convenience, in practice the force is expressed by adding a process number to the data of each process, the process number is transmitted by the control channel, the process number to the data portion of each flops port Seth There will not be added. That is, the process number is transmitted in association with the data of each process (hereinafter, the same).

[0014] the receiving apparatus 200 performs error detection as described above and receives a process from the transmission device 100. Among the processes 0-4, the process "1", "3", an error occurs in the "4", the process "0", when the ChikaraTsuta such an error occurs in the "2", Do an error occurs ChikaraTsuta process "0", is against the "2", and returns an ACK signal to the transmitting apparatus 100, the process "1" an error has occurred, "3", for the "4", the memory (not It returns a NACK signal to the transmitting apparatus 100 in terms of the drawing) holding the process. Although reply ACKZNACK signal is also transmitted in the control channel, in this case, a necessary process number reply ヽ.

[0015] receiving device 200 by returning a ACKZNACK signal by adjusting the reply time timing of each process, the transmission device 100 can identify whether ACKZNACK signal to any process. When the transmission apparatus 100 receives the ACK signal, transmits a row of UGA New Process, process number at that time is used within the past five processes including the time of adding the process number of ヽ, process number the yo arbitrarily Tsukeka 卩 ヽ (in FIG. 23, used is in! / ヽ of, and Tsukeka卩 the process number in the ascending order of the process number! /, Ru).

[0016] On the other hand, the transmission device 100 receives the NACK, process number when the force to perform the retransmission of the process an error occurs adds the same number as the previous process number. After retransmission, receiving apparatus 200 recognizes the process number, it determines to be synthesized and which process. In other words, the process "1" is a retransmission process, "3", upon receiving the "4", the process having the same process number that held in the previous NACK signal transmission "1", "2", "3" and performing packet combining, respectively. After synthesis, by examining the CRC, if it can be received without error sends back an ACK to the transmitting apparatus 100. On the other hand, when an error occurs, it maintains the process after synthesis, again, returns a NACK signal to the transmitting apparatus 100.

[0017] Although a method of synthesizing a typical method is 2 type, the present invention may utilize either synthetic methods. One retransmits the exact same data as when the previous transmission at the time of retransmission, the raw data to be synthesized and decodes the received signal at the time of retransmission and the received signal at the time of previous transmission

Of the type performing deposition and one sends the ChikaraTsuta bits such transmitted by changing the Pankuchiyarin Gupatan data symbols I 匕後 upon retransmission ever, retransmission and the received signal at the time of previous transmission to lower the equivalent coding rate by combining the received signal is of a type to improve the error correction capability (marks Goka gain). The latter technique is called IR (Incremental Redund ancy).

[0018] Such process treatment, regardless of the difference of said PARC or pre-coding is performed in the same tablet. In Then later, we continue to explain the PARC as an example.

24 shows a state of N-cha nnel Stop- and- Wait ARQ where the transmission device 100 and the receiving apparatus 200 is compatible with PARC.

[0019] As described above, PARC in the CRC attachment, the encoding, HARQ process because they are performed independently for each antenna, HARQ process number also independent number is added. In FIG. 24, a process that has been transmitted from the transmission antenna Tx # l "1", "3", "4", it occurs retransmission to have been a process "1" transmitted from the transmitting antenna Τχ # 2, Ru state show (see dotted arrows), Ru. In such cases, HARQ as described above because it is performed for each antenna systems, retransmission control is performed independently for each antenna system. Incidentally, the addition method of the process number is added by the same rules as Fig. 23.

[0020] Further, in the MIMO transmission in the next generation mobile communication system, in order to separate 'combining data signals to be transmitted between transmitting antennas Txffi, transmitting apparatus 100 includes an antenna identification signal (for example, Noirotto signal, Sukuranpu to send the ring code).

[0021] transmit antennas of the transmitting apparatus 100 in FIG. 25 indicates a pilot signal adding example of the two. As shown in (1) and (2) of FIG. 25, the pilot signal (R: Reference Symbol), each antenna systems Tx # l, between Taukai # 2, is added at the same time sequence and a different frequency sequence . Receiving apparatus 200, by referring to the pilot signal, antenna systems Rx # l signal power antenna systems in receiving the receiving apparatus 200 Taukai # 1 of signal separation, antenna series Rx # 2 in the receiving of the receiving apparatus 200 signal strength also separates the signal of antenna systems Τχ # 2, to recover the streams transmitted respective signals synthesized by (process). Also, usually, the correspondence between the antenna systems and the pilot signals are transmitted in the broadcast information.

非特許文献 1： "3GPP TR25.913 V7.3.0 Requirements for Evolved UTRA (E-UTRA) and Evolved UTRAN (E— UTRAN) (Release 7), "3GPP (France), 2006—03

特許文献 2： Lucent, "Improving MIMO throughput with per— antenna rate control

(PARC), "3GPP (France), 2001-08

非特許文献 3： Lucent, "Per Stream Rate Control with Code Reuse TxAA and APP Decoding for HSDPA, "3GPP (France), 2002-09

非特許文献 4 : "3GPP TR25.814 V7.4.0 Physical Layer Aspects for evolved Universa 1 Terrestrial Radio Access (UTRA) (Release 7), "3GPP (France), 2006—06

Disclosure of the Invention

Problems that the Invention is to you'll solve

[0022] As the communication environment MIMO transmission system is applied, cell Le configuration and the like as shown in FIG. 26 for example. That is, one cell, in the form divided into areas depending on the form of the MIMO transmission, as shown in (1) in FIG. 26, the inner area of ​​the mobile station 400 is a base station 300 (MIMO multiplex transmission area) 302 If located in the can and MIMO multiplex transmission (transmission by (1) the two streams of FIG. 26), if located in the outer area (non-MIMO multiplex transmission area) 303, non-MIMO multiplex transmission (FIG. It performed 26 of (1) the 1-stream transmission). Incidentally, the term "non-Ml MO multiplex transmission", for example, refers to MIMO single transmission for transmitting and receiving 1 streams in the MIMO diversity transmission or single antenna.

[0023] Further, as shown in (2) of FIG. 26, be a MIMO multiplexing transmission area within 302, when the mobile station 4 00 is serving to sight communication in the vicinity area 301 of base station 300, sometimes performed dare non MIM O multiplex transmit (in FIG. 26 (2), the 1-stream transmission). This is because, in the case of sight communication is because since the correlation between the antennas is generated, there may not signal separation 'synthesis is obtained a high throughput becomes difficult in the reception device 200.

In this case, even in the vicinity area 301 of base station 300 instead of the MIMO multiplex transmission, high degree of modulation, there is a possibility is Tokura is a high throughput who was subjected to non-MIMO multiplex transmission at a high encoding rate .

[0024] Thus, the MIMO multiplexing transmission by visitor location fixedly applied but are nag mobile station 400 within one cell, there is a case where the non-MIMO multiplex transmission is applied. For example, the radio quality of the mobile station 400 (e.g., the average of the SN ratio of the mobile station 400 reports to base station 300

If the value) is greater than a certain threshold performs MIMO multiplexing transmission, if less than the threshold value do non-MIMO multiplex transmission.

[0025] At this time, the number of streams to reduce the plurality of streams to one stream, for example, as PA RC, in the method of adding the process number independently for each antenna system, when the number of streams is reduced 〖that HARQ process number is duplicated (competitive) Koyori, communication Do be continued, likely arises.

[0026] Figure 27 example, in PARC, showing an example of operation when switching from MIMO multiplex transmission to the MIMO diversity transmission. This example shows a case where ACKZNACK signal is returned in one stream Ru.

[0027] from antenna systems Tx # l and antenna systems Tx # 2 of the transmitting device 100, the timing in the process "0" as shown in FIG. 27, "1", "2" is transmitted, the antenna systems Taukai # 1 , Τχ # 2 processes sent from "0", after the ACK signal for "1" is returned to the transmitting apparatus 100 from the receiver 200, at the timing indicated by reference numeral 500 in FIG. 27, the serving mobile station 400 position is the MIMO multiplex transmission area 302 shown in FIG. 26, and moved non-MIMO multiplex transmission area (MIMO diversity transmission area) 301 or 303.

[0028] At this time, the main antenna system of the transmission apparatus 100 for processing the stream entering the antenna system Tx # 2, the transmission device 100 from the antenna systems Τχ # 1 and Τχ # 2, the MIMO diversity transmission transmitting the process "2" which have been accumulated before switching. Reception equipment 200 receives these signals in antenna systems Rx # l and Rx # 2, no line for combining signals, to build the process "2". Subsequently, the receiving apparatus 200, the following problems occur here force trying to perform packet combining for the process "2" which has been held in the previous transmission.

[0029] (Problem 1) receiving apparatus 200, which process the unrecognized synthesis should do force was ヽ resend process "2" 1S holding. That is, as shown in FIG. 28, the reception apparatus 200 retransmits pro Seth "2" as the force described above to be received by the MIMO diversity, when the packet synthesis is carried out only see process number, antenna systems Rx # because on the l and antenna systems Rx # 2, respectively it processes "2" is held, it can not force determined is combined with any process. Assuming the antenna shown in the main antenna systems Rx # and the process holding the 2 attempts to synthesize the (code 601 see) If the process of the antenna systems Rx # l "2" (reference numeral 602), reference numeral 601

Want the series Rx # 2 of the process "2" packet synthesis to! / ,, integrity of synthesis to collapse.

[0030] Karoete, also occurs next challenge.

In (Problem 2) transmission apparatus 100, case 1 below, 2 shows such an erroneous retransmission occurs.

[0031] (in this case if the reply of the case DACKZNACK signal is performed by a time timing adjustment, return timing of ACKZNACK (Reply time and reply frequency), the base station instructs the mobile station.

FIG. 29 shows an overview. Receiving apparatus 200 returns a ACKZNACK signal by the time the timing adjustment of the main antenna systems Rx # 2. At this time, the transmission device 100 receives by the main antenna system Tx # 2 of the timing information reply. In this case, as shown in FIG. 29, since overlapping the retransmission timing of the antenna systems Taukai # 2 of process "2" shown in timing force sign 603 transmit device 100 receives the reply, originally antenna systems Τχ # 1 It should resend the process "2" there is a possibility to retransmit erroneous process "2" of the antenna systems Τχ # 2. At this time, the antenna series Τχ # 1 of the process "2" can not be retransmitted.

[0032] (Case 2) When the reply ACKZNACK signal is performed by process number rather than time timing adjustment

This case, reply ACKZNACK is if run without timing adjustment. Therefore, unlike the case 1, an instruction return timing adjustment is not required, it is necessary to add a process number at ACKZNACK reply.

FIG. 30 shows an overview. Receiving apparatus 200 returns a ACKZNACK signal process number indicates a light from the main antenna systems Rx # 2. At that time, to receive a reply by the antenna system Tx # 2. At this time, as shown in FIG. 30, upon receiving a reply to the process "2" of the antenna systems Τχ # 1, the transmission device 100, misinterpretation and that it Nyuarufa CK signal for the process of the antenna systems Taukai # 2 "2" and will. Therefore, the antenna series Τχ # 1 of the process "2" can not be retransmitted.

[0033] Thus, the overlap process number occurs in each antenna system, the receiving apparatus 200 can not determine synthesizing process each other of which antenna systems, on the other hand, in the transmission apparatus 100, incorrect process retransmission occurs, can not be retransmitted process to be retransmitted originally, cormorants gutter challenges arise.

[0034] Further, even if an acknowledgment (ACKZNACK signal) is returned in two string over beam to the transmitting apparatus 100 from the receiver 200, the same problem as the problem occurs. In FIGS. 31 and 32 show the way the child. That is, in the receiving apparatus 200, as shown in FIG. 28, the retransmission process "2" is held respectively by the antenna system Rx # l and antenna systems Rx # 2! /, It is combined with the process of Rudochira You can not force judgment should. Also in the transmitting apparatus 100, it arises the same problem as that described above with FIGS. 29 and 30.

[0035] That is, when switched to the MIMO diversity transmission from the MIMO multiplex transmission,

(1) If the acknowledgment is sent back from the receiving apparatus 200 is returned from the antenna system Rx # 2, as shown in FIG. 31, the force ACKZNACK signal is returned from the transmitting antenna ATT 2 of the receiver 200 the If, for operation of the transmission device 100 is similar to that shown in FIGS. 29 and 30, it will retransmit erroneous process "2" of the antenna systems Tx # 2, antenna systems Τχ # 1 process "2" You can not retransmit the,

[0036] (2) If the acknowledgment is sent back from the receiving apparatus 200 is returned by the MIMO diversity, as shown in FIG. 32, since the ACKZNACK signals are returned from the transmitting antennas ATT1 and ATT2, transmitting apparatus 100 the force main antenna systems for diversity reception was sent back by the receiving antenna ATR1 and ATR2 signals for an antenna system Tx # 2, and finally these are determined to be a reply to antenna systems Τχ # 2. Thus, retransmit erroneously process "2" of the antenna system column Τχ # 2 want ,, antenna series Τχ # 1 of the process "2" can not be retransmitted.

[0037] The present invention has been made in view of above problems, as in the case of switching to Myuiotamyu O diversity transmission from MIMO multiplex transmission, even if the number of transmission streams is changed (decreased), the process number (i.e., stream identification) to maintain the integrity of, and an object thereof is to allow continued normal communication.

Means for Solving the Problems

[0038] To achieve the above object, the present invention is characterized by the use of heat transmission control method and transmission apparatus and a receiving apparatus in a wireless communication system follows. In other words,

(1) the first aspect of the transmission control method in a wireless communication system of the present invention, predetermined data a plurality of stream data to the transmission device power receiving device having a plurality of transmit antennas

In a wireless communication system that may be transmitted in block units, the transmission apparatus, the multiple scan tree each beam data, and conflict between the stream data Do, by accompanying the data block identification information to the data block to the receiving device transmitted, the receiving apparatus, based on the data block identification information attached to the received data block is also the transmission device force, Te, same as the data block identification information previously received data blocks granted the retransmitted data block characterized in that the retransmission combining processing Toshiteteru.

[0039] (2) where the transmission apparatus, the information including an antenna identifier for transmitting antennas for transmitting the stream data, may be caused to accompany the data pro click as the data block identification information .

[0040] (3) In addition, the transmission apparatus, poppy group content a set of number information for each of the stream data, each said stream data, the data block number information in a corresponding group as the data block identification information Yo, it is allowed to accompany.

[0041] (4) Further, the receiving apparatus, the retransmission request is transmitted to the transmitting apparatus adds the de-one data block identification information to the retransmission request for the received data block, the transmitting device, the Upon receiving the retransmission request, Yo even if the data block identified by the data block identification information attached to the retransmission request to be retransmitted to the receiving equipment as the retransmission data block.

[0042] The (5), a second aspect of the transmission control method in a wireless communication system of the present invention, in a wireless communication system capable of transmitting a plurality of stream data to a receiving device from a transmitting device having a plurality of transmitting antennas, the transmitting device, wherein the detecting a stream data number reduction control factors, when the reduction control factor is detected, Tsu the stream data reduction control subject, in accordance with the untransmitted data of the hand, the number of stream data wherein Toshiteteru to delay the decrease control timing.

[0043] (6) where said transmitting apparatus from said send the unsent data is completed, be performing the reduction control Yo,.

[0044] The (7), the transmission device, monitors the radio quality between the receiver apparatus, when the radio quality is below a predetermined threshold value, even if no transmission of the remaining data is completed, Yo, it is performing the reduction control.

[0045] (8) Further, the transmitting device monitors the radio quality between the receiver apparatus, when the radio quality is below a predetermined threshold value, no residual data of the stream data reduction target lever, also be carried reduction control of the number of streams at the time Yo,.

[0046] The (9), the transmitting apparatus of the present invention, there in the transmission apparatus in a wireless communication system capable of transmitting a plurality of stream data to a receiving device from a transmitting device having a plurality of transmit antennas at a predetermined data block unit Te, wherein the plurality of each stream data, sent and transmits the data block identification information addition means for accompanying the data block identification information to the data block, the previous SL data blocks associated data block identification information to the receiving device wherein means, said data block identification information associated with the data block is provided with a control means for controlling the data block identification information addition means so as not to conflict between the respective stream data Toshiteteru.

[0047] (10) where said control means, said information including an antenna identifier for transmission antennas of the data stream, the data blocks identified as data block identification information to be associated with the data block of the data stream It is configured to include an antenna identifier generator providing the information adding means, even if,.

[0048] The (11), wherein the control means, grouping a set of number information for each of the data streams, each said data stream, data blocks to be accompanied by number information in a corresponding group to said data blocks is configured to include a group-specific number generating unit as the identification information given to the data block identification information addition means is good even ヽ be ヽ.

[0049] (12) In addition, the are accompanied by data block identification information, when a retransmission request for the received data block is received the receiving device power, the receiving device a data block is more identified in the data block identification information retransmission control means for retransmitting to the invention may further comprise a.

[0050] The (13), the receiving apparatus of the present invention, there in the receiving apparatus in a wireless communication system capable of transmitting a plurality of stream data to a receiving device from a transmitting device having a plurality of transmit antennas at a predetermined data block unit Te, the transmission device, the multiple for each stream data, Do compete among the stream data receiving means for receiving data blocks transmitted by accompanying the data block identification information, received by said receiving means based on associated data block identification information to the received data block, Te, that includes the retransmission synthesizing means for retransmission combination processing and retransmission data block and biasing marrow has been previously received data blocks of the same data block identification information features Toshiteteru.

[0051] (14) Further, the receiving device may further include a retransmission request transmission means for adding the previous SL data block identification information to the retransmission request for the received data block and transmits the retransmission request to the transmitting device it may be.

Effect of the Invention

[0052] According to the present invention, at least a following effect is advantages.

That is, as in the case where the transmission mode is switched to non-MIMO multiplex transmission from MIMO multiplexing transmission (such as MIMO diversity transmission), even if the transmission stream number between the transmitter and the receiver has changed (decreased), the transmission contention data block identification Do that arise between streams!, makes it possible to avoid erroneous combining in erroneous retransmissions and the receiver of the transmitter of the data block. Therefore, it is possible to continue normal communication (stream transmission) between the transmitter and the receiver.

BRIEF DESCRIPTION OF THE DRAWINGS

[0053] FIG. 1 is a block diagram showing the configuration of a MIMO transmission system according to a first embodiment of the present invention.

Is a block diagram showing in combination an example of a process number in order to explain the process number addition method in MIMO transmission system shown in FIG. 1; FIG.

3 is a diagram for explaining the retransmission processing operation in the MIMO transmission system shown in FIG.

A Furochi Yato explaining the operation of the transmission apparatus in the MIMO transmission system shown in FIG. 4 FIG.

5 is a diagram for explaining a returning method ACKZNACK in MIMO transmission system (case 1) shown in FIG.

Is a flow chart that explains an operation (Case 1) of the receiving apparatus in a MIMO transmission system shown in FIG. 6 FIG.

7 is a diagram for explaining a returning method ACKZNACK in MIMO transmission system (case 2) shown in FIG.

Is a flow chart that explains an operation (case 2) of the receiving apparatus in a MIMO transmission system shown in FIG. 8 Fig.

9 is a block diagram showing in combination an example of a MIMO transmission system constituting the process number of the according to the second embodiment of the present invention.

Is [10] a block diagram showing in combination an example of a vector process number describes another process number addition method in MIMO transmission system shown in FIG.

11 is a diagram for explaining the retransmission processing operation in the MIMO transmission system shown in FIG.

A Furochi Yato explaining the operation of the transmission apparatus in the MIMO transmission system shown in FIG. 12 FIG.

It is a flow chart that explains an operation (Case 1) of the receiving apparatus in a MIMO transmission system shown in FIG. 13 FIG.

It is a flow chart that explains an operation (case 2) of the receiving apparatus in a MIMO transmission system shown in FIG. 14 FIG.

Is a diagram for explaining the retransmission processing operation in the MIMO transmission system according to the third embodiment of FIG. 15 the present invention.

圆 16 is a diagram for explaining a MIMO transmission changeover method according to the third embodiment. 圆 17 is a diagram for explaining a MIMO transmission changeover method according to a fourth embodiment of the present invention.

18 is a diagram of order to explain the retransmission processing operation in the MIMO transmission system according to the fourth embodiment.

19 is a schematic diagram of a MIMO transmission system.

Is [20] a block diagram showing a configuration example of a transmission apparatus and a receiving apparatus in a MIMO transmission system shown in FIG. 19.

21 is a flow chart for explaining the operation of the transmission apparatus in the MIMO transmission system shown in FIG. 20.

22 is a flow chart illustrating the operation of the receiver in the MIMO transmission system shown in FIG. 20.

23 is a diagram for explaining the retransmission combination processing in the MIMO transmission system shown in FIG. 20.

FIG. 24 is a diagram showing a state of N-channel Stop-and-Wait ARQ where the transmitting apparatus and a receiving apparatus in a MIMO transmission system shown in FIG. 20 corresponds to the PARC.

[Figure 25] Ru FIG der showing a pilot signal adding examples in MIMO transmission system shown in FIG. 20.

FIG. 26 is a block diagram showing a cell configuration example of a MIMO transmission system.

FIG. 27 is a diagram for explaining an operation example of one where there was switched from MIMO multiplex transmission to the MIMO diversity transmission in the PARC.

[FIG. 28] is a diagram for explaining a problem of the prior art.

FIG. 29 is a diagram for explaining a problem of the prior art.

[FIG. 30] is a diagram for explaining a problem of the prior art.

[FIG. 31] is a diagram for explaining a problem of the prior art.

[FIG. 32] is a diagram for explaining a problem of the prior art.

DESCRIPTION OF SYMBOLS

1 transmitting apparatus (base station)

11 stream separator

12 CRC 付 加 部

13 encoding unit

14 HARQ transmission processing section (data block identification information addition means)

15 transmission unit

Imperial unit 16 sending system

17, 17A process number addition section (controlling means: antenna identifier generation unit, by group number generation unit)

2 trusted device (mobile station)

Signal separating and synthesizing portion 21 (by means of the letter)

22 HARQ reception processing section (retransmission combining means)

23 CRC arithmetic unit

24 ACKZNACK determination unit (retransmission request transmitting means)

25 stream synthesizing unit 25

26, 26 A process number distribution unit

Tx # l, Tx # 2, · ··, the Tx # 送信 ア ン テ ナ (ア ン テ ナ 系列)

Rx # l, Rx # 2, · ··, Rx # n receiving antennas (antenna series)

TO 送信 ア ン テ ナ

ATR receiving antenna

BEST MODE FOR CARRYING OUT THE INVENTION

[0055] Hereinafter, with reference to the drawings illustrating the embodiments of the present invention. However, the present invention is not limited to the following embodiments, it can naturally be modified in various ways without departing from the scope of the present invention.

[0056] [A] Description of First Embodiment

Figure 1 is a block diagram showing a configuration of a MIMO transmission system according to a first embodiment of the present invention, the MIMO transmission system shown in FIG. 1, a plurality of transmit antennas (antenna systems) Tx # 1, Τχ # 2, · ... have Τχ # η, the transmitting device 1 of at least one, a plurality of receiving antennas (antenna systems) Rx # l, Rx # 2, · ··, having Rx # n, at least one of the receiving device and 2 Zona Ete constructed. Note that the transmission device 1 is, for example, can be applied as a transmission system of the base station apparatus, the reception apparatus 2 can be applied as a reception system of the mobile station apparatus. Further, in this embodiment, the number of transmitting antennas and the number of reception antennas as the same number (n), but Ru, different and even.

[0057] Then, the transmitting apparatus 1, focusing on the main part, for example, a stream separation unit 11, CRC adding unit 12 for each transmit stream, an encoding unit 13 and the HARQ sending processing section 14, transmission section 15 When a retransmission control unit 16, is configured to include a process number addition section 17, the receiving apparatus 2, focusing on the main part, for example, the signal separating 'synthesizing unit 21, H ARQ reception process for each received stream the parts 22 and CRC calculation section 23, a ACKZNACK determination unit 24, a stream synthesizing unit 25 is configured to include a process number distribution section 26. Also Oite in FIG. 1, ATR is a receive-antenna transmission apparatus 1, ATT denotes, respectively Re its transmitting antenna of the receiving apparatus 2, for convenience, acknowledgment (ACKZNACK signal) of the description, the receiving apparatus 2

The transmission from the transmitting antenna ATT 1 stream is assumed to be the hand received by the receiving antenna ATR of the transmitting device 1.

[0058] Here, in the transmission apparatus 1, the stream separation section 11 is for separating the transmitted data signal to the transmission stream of each antenna systems Txffi, CRC attachment unit 12, respectively, of the error detection in the transmission stream is intended to add the CRC code for the encoding unit 13, respectively, it is to spoon code I to the required false Ri correcting codes turbo codes and etc. the added transmission stream of the CRC code.

[0059] HARQ transmission processing unit 14, respectively, transfers the transmission stream HARQ processing (blocks) for each process number to the transmitting section 15, temporarily provided with the HARQ block (process) in the retransmission control Do shown! on is intended to be held in the memory, the transmission unit 15, the process input from the HARQ transmission processing unit 14, according to a required modulation method (for example, QPSK and 16QAM, 64QAM, etc.) modulation and, those DA conversion, performs a predetermined radio transmission processing including frequency conversion to a radio frequency (RF) signal (up-conversion) and the like, and transmits whether Re Izu to transmit antenna Txffi force receiving apparatus 2 is there.

[0060] The retransmission control unit 16 receives the ACKZNAC K signal from the receiving device 2 received by the antenna ATR to determine the necessity of retransmission, the specific retransmission antenna systems Tx ffi and processes to be retransmitted if necessary to the hold from the memory of the HARQ sending processing section 14 corresponding to the retransmitted antenna series Txffi, it is to so that control be transferred by reading the appropriate process to the transmission unit 15 Ru. The antenna series Txffi and processes to be retransmitted, as described later, for example, the timing adjustment described above of ACKZNACK signal, or allows particular by explicit process numbers for ACK ZNACK signal.

[0061] Then, the process numbering mosquito radical 26 17 is for adding a process number for each HARQ block (data block) in each HARQ sending processing section 14, in this example, (antenna identifier) ​​+ (number) the information having a format by providing to the HARQ sending processing section 1 4 as process number, competition among the antenna systems Txffi (between transmission streams) (duplicates) Shinano have information, that is, the transmission stream transmission stream identifier that and summer so as to accompany. For example, as conceptually shown in FIG. 2, antenna systems Tx # l process number that is associated with the transmission stream is a bit string representation "0 ... 00xxx", the process is associated with the transmission stream of the antenna systems Taukai # 2 numbers "0 ... 01yyy", the process number is associated with the transmission stream of the antenna systems Tx # n can be an "l ... llzzz" (although, x, y, z are 0 or is 1). Transmitting apparatus 1 transmits the transmission stream to the receiving device 2 by adding such unique process number to the receiver 2.

[0062] That is, HARQ transmission processing unit 14, respectively, for each of a plurality of streams, serve as a data block identification information addition means for accompanying the process number (data block identification information) to a process (data block), process number addition section 17 has functions as control means for the process number to be associated with the process for controlling the HARQ sending processing section 14 so as not to conflict between each stream, further, the process number addition section 17, stream information including an antenna identifier for transmitting antennas Txffi of, so that also functions as § antenna identifier generating unit to give the HARQ transmission processing unit 14 as a process number to be associated with the process of the stream.

[0063] On the other hand, in the receiving apparatus 2, the signal separation 'synthesizing unit 21, the respective transmitting antennas Txffi (i = l~ n) force was also received spatially multiplexed is transmitted by the receiving antenna Rxffi signal, process distribution under the control of the parts 26, at the time of MIMO diversity separated by the process are those which can be performed da Ibashichi synthesis process, HARQ reception processing section 22, receives a stream obtained by the signal separation 'synthesizing unit 21 ( stores with process ID comprises a process) to the retransmission combination processing, and processes the stored, it is to combine the retransmission process of the same process number from the transmitter 1.

[0064] That is, the signal separation 'synthesizing unit 21, for each transmission device 1 stream, conflict between stream Do, receives the process that sent by accompanying process number (number information including an antenna identifier) functions as receiving means, HARQ reception processing section 22, the process number that is associated with the received process received by the signal separating 'synthesizing unit 21 as the receiving means based Te, was accompanied by the same process It would serve as the retransmission synthesizing means for re-sending synthesis process and the previously received process and retransmission process.

[0065] CRC arithmetic unit 23, respectively, deli performs error checking by performing CRC calculation for the received stream obtained by the HARQ reception processing section 22, ACK / NACK determination unit 24 has, in its CRC calculation result It generates and transmits a confirmation response signal Te group Dzu ヽ antenna

ATT force is also intended to be transmitted to the transmitting apparatus 1 (feedback), specifically, an ACK signal when CRC calculation result indicates a normal (OK), a NACK signal to indicate abnormal (NG) form the raw so as to fed back to the transmitting apparatus 1, Ru.

[0066] However, ACKZNACK determination unit 24 of the present embodiment, as described later, by adding an acknowledgment signal (AC KZNACK signal) on a part of the process number information (antenna identifier) ​​or all (process number) it can be transmitted to the transmission device 1. That, ACKZNA CK determination unit 24 of the present embodiment includes an antenna identification Komata to a retransmission request for the received process (NACK signal) serves the function of a retransmission request transmission means for transmitting by adding a process number to the transmitting device 1.

[0067] stream synthesizing unit 25, and outputs a string over arm of the CRC calculation result by the CRC calculator 23 is OK as synthesized and received data.

Then, the process distribution section 26 identifies the process number of the receiving process, based on the process number, signal separation to enter separately swing the reception process under any of the HARQ reception processing section 22 ' It controls the signal separation and synthesis process of the synthesis section 21 is also of a. Incidentally, for the process number identification, the process distributing unit 26, information about the process number and the additional methods used in the process number addition section 17 is previously stored in a memory (not shown) or the like, the transmitting apparatus 1 receives It should share a method for adding a process number in the device 2.

[0068] Hereinafter, the operation of the MIMO transmission system of the present embodiment having the construction described above

It will be described in conjunction with FIGS. 3-8.

First, the transmitting apparatus 1, transmission data is separated by the stream separation section 11 to the transmission stream of each antenna systems Txffi, respectively, by the corresponding CRC addition unit 12, on which the CRC code is added, Fugoi匕at section 13, the input is encoded into turbo codes or required error correction codes equal to the HARQ sending processing section 14.

[0069] In HARQ transmission processing unit 14, respectively, the transmission stream input from the code I radical 21 13 to HARQ process (blocking), as shown in FIG. 2, under the control of the process number addition section 17 , the process number is accompanied with holds in preparation for retransmission control the HARQ block (process), and transfers to the transmitter 15.

[0070] Thus, the transmission unit 15, with the process input from the HARQ transmission processing section 14, subjected to radio transmission processing described above, and transmits one of the transmit antennas Txffi mosquito ゝ et reception apparatus 2 . Conceptually shows the state in FIG. The Figure 3 shows the case antenna system of transmission and reception are their respective n = 2, respectively antenna systems Tx # l, the Τχ # 2 the "antenna identifiers" "0", "1", 0 "number" of the HARQ block, 1, 2, and ... and, in the process of sending from the antenna system column Tx # l, "0-0", "0-1", "0-2", ... that the process number is associated with the order following, in the process of transmitting antenna systems Τχ # 2 force, "1-0", "1-1", "1-2", ... process number is associated sequentially to the receiving device 2 that sent state (Kochikara the Hare see the solid line arrows to downward direction as viewed in FIG. 3) is shown.

[0071] The switching of the transmitter 1, the ΜΙΜΟ diversity transmission from ΜΙΜΟ multiplexing transmission

Even after good urchin used antennas the number of sequences in the case of (hereinafter sometimes referred to as transmission mode changeover) occurs (refer to reference numeral 500 in FIG. 3) is reduced, the processes by the process number addition section 1 7 in the same manner as described above performing stream transmission by keeping accompanying method number. Here, if the stream transmission other than the main antenna systems Txffi is completed, the antenna identifier may perform transmission and reception of the process it omits. However, the "main antenna system" means an antenna system whose use is maintained in a transmission mode before and after switching (hereinafter, the same), in the example of FIG. 3 is an antenna system Tx # 2.

[0072] The operation flowchart of transmitting device 1 including a force hunt options shown in FIG. That is, the transmission apparatus 1 is in the process number addition section 17 is accompanied by process number as described above row stream transmission, while (Step SI 1), transmission mode switching (changes to ΜΙΜΟ diversity transmission) occurs force monitors whether retransmission control unit 16 determines (step S12), (if no at step S12) transmission if mode switching is not yet generated, the retransmission control unit 16 was added as process number stream controls the process number addition section 17 and the H ARQ transmission processing unit 14 so as to continue the transmission.

[0073] In contrast, the transmission mode switching occurs! /, (If yes in step S 12) lever, retransmission control section 16 is further to be transmitted in addition to the main antenna systems Txffi data ( there process) it!, or not (step S 13), if present (if no in step S 13), the process number by the process number addition section 17 in the same manner as in step S11 concomitant

It is allowed to control the process number addition section 17 and the HARQ sending processing section 14 so as to perform the stream transmission (step S 14).

[0074] On the other hand, the main if data to be transmitted to the other antenna systems Txffi (process) does not exist (if yes in step S 13), the retransmission control unit 16, the elements a is pre SL antenna of the process number identifier is accompanied by omitting the process number by controlling the process number addition section 17 and the HARQ sending processing section 14 so as to perform the stream transmission (step S 15).

[0075] On the other hand, the receiving apparatus 2, the signal received by the receiving antenna Rxffi is, signal separation 'by combining unit 21, is separated by the process according to the control from the process distributing unit 26 each HAR Q reception processing unit It is distributed to 22 ヽ or deviation of.

In HARQ reception processing section 22, respectively, is stored together with the process number received comprises a process for the retransmission combination processing from the signal separating 'synthesizing unit 21, and processes the stored, the same come retransmitted from the transmitter 1 combining the retransmission process of the process number (if retransmission process such ヽ the receiving process is output as it is).

[0076] Then, the receiving process outputted from the HARQ reception processing section 22 by the corresponding CRC arithmetic unit 23, is subjected to the CRC calculation, the acknowledgment signal (ACK signal or NACK signal) corresponding to the calculation result There is generated in ACKZNACK determination unit 24, which is fed back to the transmitting apparatus 1 via the transmitting antenna a TT (see direction force arrow to the upward direction of the paper surface in FIG. 3). However, ACKZNACK determination unit 24, including an antenna identifier or the process number to the acknowledgment signal.

[0077] Note that the process the CRC calculation result is normal is synthesized by the stream synthesizing unit 25 and the other processes of the received stream is output as a normally received data, the CRC calculation result is abnormal for a process is the stream synthesizing unit 25 is discarded without being input.

[0078] Further, the transmitting apparatus 1, in order to retransmit the process has become abnormal at the receiving device 2 when receiving the transmission surgical instrument NACK signal a new process if the ACK signal is received as an acknowledgment signal from the receiving apparatus 2 , that controls the process number addition section 17 and the HARQ sending processing section 14. Incidentally, the process should be the new Z retransmission is specified based on the antenna identifier or the process number included in the received acknowledgment signal.

[0079] Thus, HARQ transmission processing unit 14, even when the process retransmission retransmits the process of the same process number as the previous transmission, the receiving apparatus 2, the identification of the received process number by the process distributing unit 26, the reception the distribution control of the process, even the number of transmission streams, such as when switching from MIMO multiplex transmission to non-MIMO multiplex transmission such as MIMO diversity Shichi transmission or MIMO single transmission (the number of transmit antennas) is fluctuated, HARQ reception processing section 22 correct in this 〖! /, it is possible to perform the synthesis of the process.

[0080] For example, when the number of transmitting antennas and switch between the different to the MIMO diversity transmission occurs at a timing indicated by reference numeral 500 in FIG. 3 it considers the case of decreased 2 → 1 (antenna systems Tx # 2 only), reception device 2, the distribution of the correct process from the transmission device 2 to the switching after, also receive retransmission process which process number (see the double arrow directed in the downward direction as viewed in FIG. 3), by the process distributing unit 26 the conducted synthesis of correct process, i.e., it is possible to perform the synthesis process of each other the same process number. That is, it is possible to prevent the integrity of the collapse of the synthesis (capable of solving the problem 1).

[0081] Further, more devising as shown in the following case 1, 2 returning method ACKZNACK, the object 2, i.e., in the transmitting apparatus 1, erroneous process retransmission occurs, the process should be retransmitted originally retransmission can Do, and, cormorant problem can be solved.

[0082] (Case 1) When the ACKZNACK signals received by timing adjustment (FIG. 5, FIG. 6) shows a 3 equivalent conceptual view of the present case 1 in FIG. As shown in FIG. 5, even after the transmission mode changeover (change to the MIMO diversity transmission) occurs (reference numeral 500), the receiving device 2, use the antenna identifier of each antenna system (additional) confirmed response It carried a reply signal (ACK ZNACK signal). Here, the sense that the antenna identifier "use" is explicitly rather than return a ACKZNACK signal by adding the antenna identifier, for example, even if the main antenna system is not fixed to one, the transmitting apparatus each the frequency band of the AC KZNACK signal antenna systems instructs the receiving device, the receiving device is a means that returns the ACKZNACK by utilizing the frequency bands. Therefore, when the transmission device receives a ACKZNAC K signal, it is possible that the frequency band is analyzed to identify whether ACKZN ACK for every antenna systems. On the other hand, means that the antenna identifier "addition", as shown in FIG. 5 or of, adding an antenna identifier explicitly ACKZNACK signal

, It is meant that.

[0083] In FIG. 5, for example, antenna systems Tx # l of the transmitter 1 after transmission mode changeover occurs (main antenna system is Τχ # 2) Focusing on the process "0-2" transmitted power, receiver 2, a signal obtained by adding the antenna identifier "0" is the received process number element of "0-2" as the acknowledgment signal (part) for the process "0-2" generated by ACKZNACK determination unit 24 transmission unit to reply to 1.

[0084] Accordingly, the transmitting apparatus 1 includes a confirmation response signal synchronized with respect to return timing of is taken (i.e., the receiving device the transmission device 1 is acknowledgment signal 2 for at least sending process with the receiving apparatus 2 Given the incoming) that the timing adjustment between the at retransmission control unit 16, the acknowledgment signal can be you to recognize that those for the process "0-2", the process "1-2 "the Kotonagu process" 0-2 "erroneously retransmits the it is possible to correctly retransmitted from the main antenna systems Tx # 2.

[0085] In addition, the transmission apparatus 1, when it becomes to transmitting and receiving process by omitting the antenna identifier as described above (i.e., when the main antenna system Τχ # 2 other than the process could be transmitted all), confirmed also replies the response by sending omit antenna identifier, since the timing adjustment being performed, the transmitting apparatus 1 can identify whether the acknowledgment signal for any process.

[0086] shows a flowchart of the operation of the receiving apparatus 2 in this case 1 in FIG. 6.

That is, the reception device 2, there whether transmission mode switching (changes to ΜΙΜΟ diversity transmission) occurs monitored, determined (step S21), if no transmission mode switching occurs (in step S21 in no situ), by ACKZNACK determination unit 24, you return to the transmitting apparatus 1 generates an acknowledgment signal added with the antenna identifier is a number element of the received process. Further, if the acknowledgment signal is the NACK signal, at the HARQ reception processing section 22, it holds the reception process in preparation for retransmission combining (step S22).

[0087] On the other hand, if the transmission mode switching occurs (in case of yes at step S21), and the receiving device 2, by the process distributing unit 26 performs the separation of the received process (identification of the process number) (scan Tetsupu S23) , the antenna identifier is accompanied determines whether Luke (step S24). As a result, if the antenna identifier is associated (if yes in step S 24), receiving apparatus 2, as in the case of the step S22, by adding the antenna identifier is a number element of the received process as well as back to the transmitter 1 generates an acknowledgment signal, when those said acknowledgment signal is the NACK signal, at the HARQ reception processing section 22, holds the reception process in preparation for retransmission combining (step S25).

[0088] In contrast, it is added an antenna identifier, Do, if (in the case of no at step S24), and the receiving apparatus 2, since the timing adjustment is performed, response acknowledgment antenna identifier with reply omitted and continue transmitting apparatus 1, if the acknowledgment signal is the NACK signal, at the HARQ reception processing section 22, it holds the reception process in preparation for retransmission combining (step S26).

[0089] Thus, in this case 1, the transmission mode switching (change to the MIMO diversity transmission) occurs, as long as it is necessary to identify each transmission process among the antenna systems Txffi (Rxffi), acknowledgment and only pressurized with the antenna identifier which is an information element of the received process number to the signal returns the information amount to the transmitting apparatus 1 while minimizing, and can transmit the main antenna system Tx # 2 other than the process are all when no longer required to identify each transmission process among the antenna systems Txffi (Rxffi), so omit the accompanying of the antenna identifier, possible to effectively utilize the radio resources between the transmission equipment 1 and the receiver 2 can.

[0090] (Case 2) the ACKZNACK signal, to reply explicitly adding process number

(7, 8)

Figure in this case in FIG. 7 3 shows a conceptual view corresponding to FIG. Since the 7, even after the heat transmission mode switching (change to the MIMO diversity transmission) occurs (reference numeral 500), does not get the timing adjustment between the transmitter and the receiver, the received device 2 returns a ACKZNACK explicitly adding process number.

[0091] For example, even the case 2, 7, paying attention to the process "0-2" sent from the antenna sequence Tx # l transmitting apparatus 1 after transmission mode changeover occurs (main antenna system is Τχ # 2) then, the receiving apparatus 2, to the receiving process "0-2" generates Tsukeka卩 signal process number in ACKZNACK determination unit 24 sends equipment 1 as an acknowledgment signal to the process "0-2" Reply.

[0092] Thus, the transmitter 1, an acknowledgment signal to the transmission process with the receiving apparatus 2

No. synchronization is taken with respect to return timing of, Ru force, Do, whether at the retransmission control unit 1 6, in the reply (in this example for the acknowledgment signal which antenna series Txffi throat process, the process "0 it is possible to identify whether the reply) for 2 ", the process" 1-2 "the Kotonagu process" 0-2 "erroneously retransmits the be correctly retransmitted from the main antenna systems Tx # 2 becomes possible.

[0093] shows a flowchart of the operation of the receiving apparatus 2 in the present case 2 in FIG. 8.

That is, the reception device 2, there whether transmission mode switching (changes to ΜΙΜΟ diversity transmission) occurs monitored, determined (step S31), if no transmission mode switching occurs (in step S31 in no situ), by ACKZNACK determination unit 24, and generates and returns a confirmation response signal added to the received process number to the transmitting device 1. Further, if the acknowledgment signal is the NACK signal, at the HARQ reception processing section 22, it holds the reception flop port processes in preparation for retransmission combining (step S32).

[0094] On the other hand, if the transmission mode switching occurs (in case of yes at step S31), the receiving apparatus 2, by the process distributing unit 26 performs the separation of the received process (identification of the process number) (scan Tetsupu S33) , the antenna identifier is accompanied determines whether Luke (step S34). As a result, (if yes in step S34) If the antenna identifier is associated, receiving apparatus 2, as in the case of the step S32, the transmission apparatus a confirmation response signal by adding a received process number as well as back to 1, if the acknowledgment signal is the NACK signal, at the HARQ reception processing section 22, holds the reception process in preparation for retransmission combining (step S35).

[0095] In contrast, ヽ antenna identifier is accompanied, if (in the case of no at step S34), that is, the transmission apparatus 1, and can transmit the main antenna system Txffi other processes are all the antenna identifier If omitted to now transmit and receive processes, the receiving apparatus 2, it is possible to omit the addition of the antenna identifier omitted without adding the antenna identifier, the main antenna system Tx # 2 number (antenna identifier with the conventional method and an acknowledgment signal by using the same process number) and returns to the transmitting apparatus 1, if the acknowledgment signal is Nyuarufa CK signal at the HARQ reception processing section 22 includes a retransmission combining holds the receive process Te (step S36).

[0096] Thus, in the present case 2, the transmission mode switching (change to the MIMO diversity transmission) occurs, as long as it is necessary to identify each transmission process among the antenna systems Txffi (Rxffi), acknowledgment since returns to the transmission device 1 adds the received process number to the signal, the synchronization is ヽ a Tore respect return timing of the acknowledgment signal to the transmission process between the receiving device 2, even if the transmitting device 1 to you, the process to be retransmitted can be made to correctly identify another Te, it is possible to reliably suppress erroneous retransmission of the retransmission process.

[0097] Also in this case 2, and can transmit the main antenna system Tx # 2 other than the process are all required disappears if identifying the transmit antennas among the antenna systems Txffi (Rxffi), of those said transmitting antenna since omitted additions can be utilized effectively radio resources between the transmitter 1 and the receiver 2.

[0098] [B] Description of Second Embodiment

Figure 9 is a block diagram of a corresponding 2 showing the configuration of a MIMO transmission system according to a second embodiment of the present invention, MIMO transmission system (transmitter 1 and receiver 2) shown in FIG. 9, FIG. 1 and FIG. in comparison with the configuration shown in 2, in place of the process number addition section 17 and processes vibration Wakebe 26 described above, that it consists different provided with a process number addition section 17A and a process distribution section 26A . The other configuration is the same as the same or as described above with FIGS. 1 and 2, as in FIG. 2 in FIG. 9, some components of the transmitter 1 (string over arm separating unit 11, CRC calculator 12 and the code I radical 21 13), as well as illustration of some of the components of the receiving apparatus 2 (CRC calculation section 22 and the stream combining unit 25) is omitted, respectively.

[0099] Here, the process numbering mosquito radical 26 17A of this embodiment, antenna systems against us to the HARQ sending processing section 14! /, Te obtained that HARQ block (process), a process number Te to base intended to be added independently to avoid conflict between Txffi, for example, it is conceivable pressure method with shown in the following (1) or (2).

[0100] (1) As shown in FIG. 9, Yuki and Tsukeka 卩 in ascending order (or a descending order) from the antenna systems Tx # l to antenna systems Tx # n, for the stream of the last antenna system Τχ # η If you decide to process numbers, how to slide into Tsukeka卩 the process number in ascending order from the first antenna series Τχ # 1 again. That is, a method of adding a repetitive series of process number for all antenna systems Txffi. For example, etc. Table Gensuru process number is a bit string of antenna systems Tx # l '... 00000 ", and the process numbers for the antenna system Tx # n is" becomes ... 00111 ", further followed by the antenna system Τχ # 1 process number is "... 01000", the process number followed by the antenna series Τχ # η is "... 01111".

[0101] (2) As shown in FIG. 10, and independently for each antenna system Txffi (not compete) method slide into adding a series of process numbers in ascending order (or a descending order). For example, process number of antenna systems Tx # l is "... 00000～ ... 00111", the process number of antenna series Τχ # 2 is "... 01000～ .. .01111", the process number of antenna series Τχ # 3 is becomes "... 10,000 ... 11111".

In other words, the process number addition section according to the present embodiment (control means) 17A is Do compete between similar streams in the first embodiment!, The additional control of the process number realization surgical instrument set of number information each stream grouped into, for each said stream, a function as a group-specific number generating section that gives, for example, as process ID number information to be added to the sending process in the corresponding group (data block identification information) to the HARQ transmission processing unit 14 it means that combines

[0102] In addition, in order to avoid the same problem as the first embodiment in any case of the above (1) and (2), to share the additional method of process number at the transmitter 1 and the receiver 2 in need should there Ru.

That is, for the process number identification, in the process distribution section 26Α of the receiving device 2, stored in advance in the process number and a memory or the like not shown FIG. Information about the additional methods used in the process number addition section 17A it should be shared additional method of a process number between the transmitter 1 and the receiver 2. Thus, the process distribution section 26Α, identifying the process ID of the receiving process, based on the process number, signal separation to enter distributes the received process under any of the HARQ reception processing section 22 ' it is possible to control the signal separation and synthesis process of the synthesis section 21.

[0103] The operation of ΜΙΜΟ transmission system of the present embodiment configured as described above will be described in conjunction with FIGS. 11-14.

First, the transmitting apparatus 1, transmission data is separated by the stream separation section 11 to the transmission stream of each antenna systems Txffi, respectively, by the corresponding CRC addition unit 12, on which the CRC code is added, Fugoi匕at section 13, encoded into required error correction codes such as turbo codes

Which is input to the HARQ sending processing section 14.

[0104] In HARQ transmission processing unit 14, respectively, and HARQ transmission stream input from the code I radical 21 13 processing (blocks), as shown in FIG. 9 or 10, from the process number addition section 17A given (step S41 in FIG. 12) to Tsukeka卩 a process number that does not conflict between antenna systems Txffi, both the holds in preparation for retransmission control the HARQ block (process), and transfers to the transmitter 15 .

[0105] Thus, the transmission unit 15, with the process input from the HARQ transmission processing section 14, subjected to radio transmission processing described above, and transmits one of the transmit antennas Txffi mosquito ゝ et reception apparatus 2 . Conceptually shows the state in FIG. 11. FIG 11 is a diagram phases to those in FIG. 3 of the first embodiment, Te when antenna system of transmission and reception are each n = 2, and, when applying the additional method shown in FIG. 9 Nissu is shown, the flop opening processes to be transmitted from the antenna systems Tx # l, "0", "2", "4", ... even-process number is added sequentially called, the process of sending the antenna-series Taukai # 2 the, the process number and independent of the antenna systems Τχ # 1 (to avoid conflicts), "1", "3", "5", the receiving apparatus ... odd process number is added sequentially of 2 It is transmitted (see Kochikara the Hare solid arrow the downward direction as viewed in FIG. 9) state is shown to.

[0106] Also in this embodiment, the transmitting apparatus 1, after use antenna systems speed is reduced as in the transmission mode switching occurred (reference numeral No. 500 in FIG. 11) also, in the same manner as described above while maintaining the adding method of the process number addition section 17A according to the process number Te performing stream transmission.

[0107] In the receiving apparatus 2, for example, in the case of FIG. 11, the received process "4" and the process "5", the process distribution section 26Arufa, are identified each process number, be distributed to the correct antenna systems Rxffi can. Therefore, even if the transmission mode switching occurs at the HARQ reception processing section 22, the synthesis of the correct process, i.e., it is possible to perform the synthesis of the same process number to each other in the process. That is, it is possible to prevent the integrity of the collapse of the synthesis (capable of solving the problem 1).

[0108] Further, even per cent ヽ the present embodiment, the returning method ACKZNACK, like the first embodiment, by devising as shown in the following case 1, 2, the object 2, i.e., transmission apparatus

In 1, erroneous process retransmission occurs, the process should be retransmitted originally leaving in be solved Chi cormorant problem have Failing retransmission.

[0109] (when receiving the timing adjustment case DACKZNACK signal (Fig. 13)

Receiving device 2, even after the transmission mode changeover (change to the MIMO diversity transmission) occurs (refer to reference numeral 500 in FIG. 11), as in the first embodiment 1, utilizing the antenna identifier of each antenna system ( added) to carry out the reply of the acknowledgment signal (ACKZNACK). Here, "use" the antenna identifier, and means "addition" is the same meaning as in the first embodiment.

[0110] In addition, after switching to MIMO diversity, in the first embodiment, means that the process number antenna identifier is not added is received by the receiving device, the process only from the main antenna system has decreased as sent did. However, in the second embodiment, since the process number received antenna identifier is not added, if after a certain time (T), the transmitting apparatus 1, antenna systems Tx in the case of the main antenna system (Fig. 11 # and adapted to transmit a process only from 2). Therefore, after Τ time, the receiving apparatus 2, reply acknowledgment can omit an antenna identifier can return an acknowledgment signal to the transmitting device 1 by using only the timing information of the main antenna systems.

[0111] The operation flowchart of the receiving apparatus 2 in this case 1 shown in FIG. 13.

As shown in FIG. 13, the receiving apparatus 2, monitors whether the transmission mode switching (changes to ΜΙΜΟ diversity transmission) occurs, is determined (step S51), if the transmission mode switching has not occurred ( if no in step S51), the ACKZNACK determination unit 24, and returns to the transmission device 1 generates an acknowledgment signal using (adding) the § antenna identifier. Also, if the acknowledgment signal is the NACK signal, at the HARQ reception processing section 22, it holds the reception process in preparation for retransmission synthesis (step S52).

[0112] On the other hand, if the transmission mode switching occurs (in case of yes at step S51), the receiving apparatus 2, by the process distribution section 26A, performs separation of the received process (identification of the process number) (step S53), determining a force whether the time T has elapsed (step S54). As a result, unless elapsed time T (if no in step S54), the receiving apparatus 2, as in the case of the scan Tetsupu S52, generates an acknowledge signal which utilizes an antenna identifier (added) as well as back to the transmitting apparatus 1 Te, the acknowledgment signal when the NACK signal at the HARQ reception processing section 22, holds the reception process in preparation for retransmission combining (Sutetsu flop S55).

[0113] In contrast, (If yes in step S 54) if the elapsed time T, the receiving apparatus 2 sends back an acknowledgment signal to the transmitting device 1 by using the timing information of the main antenna systems and also when 〖this, the acknowledgment signal is the NACK signal, at the HARQ reception processing section 22, holds the reception process in preparation for retransmission combining (step S56).

[0114] Thus, also in this case 1, the transmission mode switching (change to the MIMO diversity transmission) occurs, as long as it is necessary to identify each transmission process among the antenna systems Txffi (Rxffi), each use an antenna identifier (added) to send device 1 sends back an acknowledgment signal, and can transmit the main antenna system Tx # 2 other than the process are all necessary to identify each transmission process among the antenna systems Txffi (Rxffi) if it disappears, so it replies acknowledgment by using only the timing information of the main antenna systems, it is possible to effectively utilize the non-linear resource between the transmitter 1 and the receiver 2.

[0115] (Case 2) the ACKZNACK signal, to reply explicitly adding process number

(Figure 14)

Receiving device 2, even after (code 500 see FIG. 11) transmits the mode switching (change to the MIMO diversity transmission) occurs, to Shin explicitly returns the Tsukeka 卩 to ACKZNACK the process number. 11 For example, when attention is paid to the process "4" transmitted from the antenna systems Tx # l of the transmitter 1 after transmission mode changeover occurs (main antenna system is Τχ # 2), the receiving apparatus 2, the process "4" you back to the transmitting apparatus 1 a signal obtained by adding a process number generated by the ACKZNACK determination unit 24 of the receiving process "4" as the acknowledgment signal for.

[0116] Thus, the transmitter 1 at the retransmission control unit 16 (in this example, a reply to the process "4") reply to the acknowledgment signal which antenna series Txffi throat process identifying whether can, and the process "5" Kotonagu process "4" erroneously retransmits the can correctly retransmitted from the main antenna system column Tx # 2.

[0117] Also in this case 2, after the occurrence of transmission mode switching, some time (T) is elapsed

If, the transmitter 1, after the force T time to send only process from the main antenna system, the transmitting apparatus 2 can not send a process to omit the process number. In this to case 2, after the occurrence of transmission mode switching, and after some time (T), the transmission device is also adapted to transmit only the process from the main antenna systems, case 1 unlike timing synchronizationヽ that, since 0.00, process number, it is necessary to return an acknowledgment added.

[0118] shows a flowchart of the operation of the receiving apparatus 2 in the present case 2 in FIG. 14.

That is, the reception device 2, there whether transmission mode switching (change to the MIMO diversity transmission) occurs monitored, determined by (step S61), if no transmission mode switching occurs (in step S61 in no situ), by ACKZNACK determination unit 24, and generates and returns a confirmation response signal added to the received process number to the transmitting device 1. Further, if the acknowledgment signal is the NACK signal, at the HARQ reception processing section 22, it holds the reception flop port processes in preparation for retransmission combining (step S62).

[0119] On the other hand, if the transmission mode switching occurs (in case of yes at step S61), the receiving apparatus 2, by the process distribution section 26A, performs separation of the received process (identification of the process number) (step S63), regardless of the force whether the T time has elapsed, as well as back to the transmitter 1 generates an acknowledgment signal added to the received process number, if the acknowledgment signal is NA CK signal, HARQ reception processing section at 22, holds the reception process in preparation for retransmission combining (step S66).

[0120] Thus, in the present case 2, the transmission mode switching (change to the MIMO diversity transmission) occurs, as long as it is necessary to identify each transmission process among the antenna systems Txffi (Rxffi), acknowledgment since returns to the transmission device 1 adds the received process number to the signal, the synchronization is ヽ a Tore respect return timing of the acknowledgment signal to the transmission process between the receiving device 2, even if the transmitting device 1 to you, the process to be retransmitted can be made to correctly identify another Te, it is possible to reliably suppress erroneous retransmission of the retransmission process.

[0121] [C] Description of Third Embodiment

In the first and second embodiments described above, by adding additional method of process numbers to avoid conflicts among the antenna systems, MIMO multiplexing transmission power non-MIMO multiplex transmission

Even when switching to, the synthesis of the correct process to prevent erroneous retransmission process, the force to this embodiment shown the ability to continue without interruption transmission streams, transmitted independently process number for each antenna systems also in the conventional PARC or pre-coding to be added to the stream, indicating the proposed method to continue communication without let interrupting the stream transmission.

[0122] In this embodiment, the first place when the transmission mode switching occurs, the process in § antenna series other than the main antenna system is able to remain focused on the retransmission erroneous due to occur. Wherein, in order to prevent erroneous retransmission, the switch (stream according to the MIMO from multiplexing transmission in example switched to send MIMO diversity Den, process (not transmit process) remaining on antenna systems other than the main antenna system weight you delay the timing of the reduction control) number (for example, after the transmission of the remaining process is finished all, carrying out the switching).

[0123] FIG. 15 shows a state of communication between the transmitter 1 and the receiver 2 in the case of applying this method. 5 and FIG. 7, FIG. 11, when the movement of the receiving apparatus 2 from the MIMO multiplex transmission area 302 (see FIG. 26) to the non-MIM O multiplex transmission area (MIMO diversity area) 301, 303 is detected, the transmitter immediately implemented switching to MIMO diversity transmission in 1! / I was ヽ (reference numeral 500).

[0124] On the other hand, in FIG. 15, also the movement at the timing indicated by reference numeral 600 (area change) is detected due to the presence of residual process "2" to the antenna systems Tx # l at that time, send apparatus 1 continues the MIMO multiplex transmission, in fact, switching to MIMO die Bashichi transmission from MIMO multiplexing transmission is after the transmission of the remaining process "2" ends (for example, a timing indicated by reference numeral 700) . Thus, as in the first embodiment and the second embodiment, without applying the special process number addition method, in a more simple control, the communication without causing interruption of stream transmission upon mode switching occurs it is possible to continue.

[0125] However, in this method, so that retransmission of the residual process "2" is unable to switch to a MIMO Daibashi switch until it succeeds. Therefore, for example, as shown in FIG. 16, apart from the MIMO die Bashichi transmission switching threshold (the threshold for radio quality A), even if the process is not remain rather threshold B relates to the threshold (radio quality for switching the MIMO diversity A ) providing a. The transmission device 1, the case between the radio quality of the receiving device (mobile station) 2 is the threshold A and the threshold B, if there is residual process continues MIMO multiplexing transmission, if the radio quality is below the threshold value B, with or without residual data, switching to MIMO diversity transmission.

[0126] Incidentally, the above function, for example, to be implemented as a function of the above-described retransmission control unit 16, Ru can also be implemented as a separate control unit (transmission mode changeover timing controller). Further, the radio quality of the receiving apparatus 2, for example, be grasped by using the known methods transmit equipment 1 such as feeding back reception quality information of the SIR or CQI or the like measured by the receiving apparatus 2 to the transmitting apparatus 1 it is (hereinafter the same).

[0127] [D] Description of Fourth Embodiment

Here, as in the third embodiment described above, even in the conventional PARC adding a process number to the transmission stream independently for each antenna systems, it illustrates another approach to continue without having to go interruption stream transmission.

[0128] In this embodiment 4, as in the third embodiment, the process antenna systems other than Shua antenna sequence during transmission mode switching occurs is residual retransmission erroneous due arising particular attention is paid. That is, the non-MIMO multiplex transmission from MIMO multiplex transmission during the mode switch to (MIMO da Ibashichi transmission), the radio quality of the receiving device 2 is greater than the switching threshold (threshold value A), another threshold (threshold C) smaller than (i.e., threshold C> threshold a> threshold value B), and, if there is no transmission data to the antenna systems other than the main antenna system (process), the transmitting apparatus 1, that the radio quality is below the threshold value a switch to the MIMO diversity transmission to Guso since the time of a wait.

[0129] FIG. 17 shows a setting example of the threshold value A, C. Further, in FIG. 18 shows a state of the communication between the transmitter 1 and the receiver 2 of applied if the method of the present embodiment.

In Figure 18, after the movement of the receiving apparatus 2 from the MIMO multiplex transmission area to a non-MIMO multiplex transmission area (MIMO diversity Shichieria) is detected (reference numeral 600), NACK for the process "2" of the antenna systems T x # l signal immediately after (dotted arrows 610 refer) retransmission processes "2" for the transmitting device 1 receives a occurs, an ACK signal for the retransmission process (see the solid line arrow 6 20) is returned to the transmitting apparatus 1, antenna systems residual process of tx # l indicates a state that is transmitted all have. Transmitter 1, if the radio quality of the receiving device 2 in this way residual process without a ivy time later between the threshold A and the threshold C, and the timing indicated by reference numeral 700, is switched immediately to the MIMO diversity transmission be able to.

[0130] In the above function, for example to be implemented as a function of the above-described retransmission control unit 16, Ru can also be implemented as a separate control unit (transmission mode changeover timing controller). The threshold A described above, the threshold value B, the threshold C, as long as satisfying a relation of threshold C> threshold A> threshold value B, may be set simultaneously.

Industrial Applicability

[0131] As described above in detail, according to the present invention, in a wireless communication system, even when the number of transmission streams between a transmitting device and the receiving device is changed (decreased), retransmission combination target data block while maintaining the integrity, since it is possible to continue normal communication, which is very useful in wireless communications art.

The scope of the claims

[1] In the radio communication system a plurality of stream data to the receiving device from the transmitting device may transmit a predetermined data block unit having a plurality of transmission antennas,

The transmission apparatus,

Wherein for each of a plurality of stream data, wherein no conflict between stream data Data Pro Tsu by accompanying the click identification information transmitted the data block to the receiving device,

The receiving device,

The data block identification information based Dzu accompanying the received data blocks from the transmitting apparatus Te, characterized in that it retransmission combining operation with respect to the previously received data block and the retransmission data block the same data block identification information is accompanied the transmission control method in a wireless communication system.

[2] The transmission device,

Said information including an antenna identifier for transmitting antennas for transmitting stream data, and wherein the to be attached to the data block as the data block identification information, transmission control method in a wireless communication system according to claim 1.

[3] The transmission apparatus,

Grouping a set of number information for each of the stream data, for each the stream data, and wherein the to be attached to the data block number information in a corresponding group as the data block identification information, according to claim 1, wherein Den transmission control method in a wireless communication system.

[4] The receiving apparatus,

It said data block appends the identification information to the retransmission request for the received data block and transmits the retransmission request to the transmitting device,

The transmission apparatus,

When receiving the retransmission request, and wherein the retransmitting to the receiving device a data block is identified by the data block identification information added to the retransmission request as the retransmission data block, the radio communication according to claim 1, wherein transmission control how in the system.

[5] In the radio communication system capable of transmitting a plurality of stream data to a receiving device from a transmitting device having a plurality of transmission antennas,

The transmission apparatus,

Detecting a decrease control factor of the number of stream data,

When the reduction control factor is detected, in accordance with the untransmitted data amount for stream data reduction control object, characterized by delaying a decrease control timing of the number of stream data, transmission control method in a wireless communication system .

[6] The transmission apparatus,

Wherein after the transmission of unsent data is completed, which comprises carrying out the reduction control, transmission control method in a wireless communication system according to claim 5.

[7] The transmitting device,

Monitors the radio quality between the receiver apparatus,

Wherein the radio quality is below a predetermined threshold, even if no transmission of the remaining data is completed, which comprises carrying out the reduction control, transmission control method in a wireless communication system according to claim 5.

[8] The transmitting device,

Monitors the radio quality between the receiver apparatus,

Wherein when the radio quality is below a predetermined threshold value, if no residual data of the stream data reduction target, which comprises carrying out the reduction control of the number of streams at the time, according to claim 5, wherein the radio transmission control method in a communication system.

[9] shall apply multiple stream data to the receiving device from the transmitting device having a plurality of transmit antennas at the transmitting apparatus in a wireless communication system capable of transmitting a predetermined data block unit,

Wherein for each of a plurality of stream data, and the data block identification information associated means for accompanying the data block identification information to the data block,

Transmitting means for transmitting the data block identification data block which is associated with the said receiving device,

Wherein the data block identification information to be associated with the data block is provided with a control means for controlling the data block identification information associated means so as not to conflict between the respective stream data transmission apparatus in a wireless communication system.

[10] The control means,

Said information including an antenna identifier for transmission antennas of the data stream, provided with the antenna identifier generating unit as a data block identification information to be to be attached to the data blocks of those the data stream supplied to the data block identification information addition means configured made, characterized in that has been, transmitted in a wireless communication system according to claim 9, wherein device.

[11] The control means,

Grouping a set of number information for each of the data stream, the respective data stream, by groups which give the data block identification information addition means number information in a corresponding group as the data block identification information to be associated with the data block characterized in that it is configured to include a number generator, a transmission apparatus definitive to the wireless communication system of claim 9, wherein.

[12] The appended data block identification information, when the retransmission request for the received data block received from the receiving apparatus, retransmission control to retransmit the data block identified by the data block identification information to the receiving device characterized in that further comprising a means, transmitting apparatus in a wireless communication system according to any one of claims 9-11.

[13] shall apply in the receiving apparatus in a wireless communication system capable of transmitting a plurality of stream data to the receiving device from the transmitting device at a predetermined data block unit having a plurality of transmission antennas,

The transmitting device, a receiving hands stage the multiple for each stream data, receives the data blocks sent the to accompany the data block identification information that does not conflict between stream data,

Group the data block identification information associated with the received data block received by said receiving means Dzu, Te, and retransmission synthesizing means for the same data block identification information is retransmission combination processing and previously received data block and the retransmission data block associated characterized in that provided, the receiving device in a wireless communication system.

[14] The received data blocks Nitsu, characterized in that it appends the data block identification information to a retransmission request of the hand the retransmission request further includes a retransmission request transmission means for transmitting to said transmitting apparatus, wherein receiving apparatus in a wireless communication system of claim 13, wherein.