CN101106410A - A data retransfer method of multi-input and multi-output system and data transmission terminal device - Google Patents
A data retransfer method of multi-input and multi-output system and data transmission terminal device Download PDFInfo
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Abstract
The invention discloses a multi-input-multi-output system data re-transmitting method and a data transmitting end equipment. The method comprises the steps that a transmitting end gains the feedback incorrect decoding data news from a receiving end; then, the transmitting end re-transmits the incorrect decoding data redundant information at a transmission layer and transmits the new data at the successful decoding data transmission layer. The invention is capable of enhancing the data transmission efficiency and system capacity.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to a kind of data repeating method and data sending terminal equipment of multi-input multi-output system.
Background technology
Data communication grows up on wired network at first, requires bigger bandwidth and higher transmission quality usually.For the system of wired connection, reliability of data transmission realizes by retransmitting.Current when once attempting bust this, need retransmitted data packet, such transmission mechanism be referred to as automatic request retransmission (Automatic Repeat ReQuest, ARQ).Under the wireless transmission environment, interchannel noise and because the factors such as interference that the decline that brings of mobility and other users bring make channel transmission quality very poor is suppressed various interference so should protect the data grouping.This protection mainly is to adopt forward error correction coding (Forward Error Correction, FEC) realization, the i.e. extra bit of transmission in grouped data.Therefore, in wireless communication system, ARQ technology and FEC technology are combined, use the automatic request retransmission HARQ mechanism of mixing to carry out the re-transmission of data.
Traditional communication system is to advance singly to go out singly that (Single-Input Single-Output, SISO) system promptly use a transmitting antenna and reception antenna respectively at transmitting terminal and receiving terminal, and the antenna of signal by transmitting terminal and receiving terminal transmits and receive.
At present, the multiple-input and multiple-output of wireless communication field (Multiple-Input Multiple-Output, MIMO) technology is meant at transmitting terminal and receiving terminal and uses a plurality of transmitting antennas and reception antenna respectively, signal transmits and receives by a plurality of antennas of transmitting terminal and receiving terminal, thereby improves each quality of services for users (reduce bit error rate or improve message transmission rate).Advance singly (Multiple-Input Single-Output, MISO) mode and advance to have more singly that (Single-InputMultiple-Output, SIMO) mode also is the part of MIMO based on transmit diversity and receive diversity more.
Referring to Fig. 1, be the principle schematic of mimo system in the prior art.The multiple-input, multiple-output of MIMO are at the multipath wireless channel.Flow of transmitted information S (k) forms N information stream c through the transmitting terminal Space Time Coding
i(k), i=1 ..., N.This N son stream is launched by N antenna, and M reception antenna by receiving terminal after the space channel transmission receives, and receiving terminal is with M the son stream r that receives
i(k), i=1 ..., M reverts to information flow (k) after the decoding when sky.
Usually, the multipath transmission can cause signal fadeout, thereby is regarded as adverse factor.Yet result of study shows that for mimo system, multipath can be used as a favorable factor and is used.Transmitting terminal sends to channel simultaneously with N son stream, and respectively transmitting takies identical frequency band, thereby does not increase bandwidth.If the channel response between each transmit receive antenna is independent, then mimo system can be created a plurality of parallel spatial channels, transmits information independently by these parallel spatial channels, has improved data transmission rate, has also promptly improved power system capacity.
Power system capacity is one of most important sign of characterize communication systems, expression communication system maximum transfer rate.For number of transmit antennas is N, and the reception antenna number is the mimo system of M, and when power and bandwidth fixed, the heap(ed) capacity of mimo system or maximum size be linear increasing with the increase of minimum antenna number.As can be seen, Ci Shi channel capacity linear increase along with the increase of antenna amount.That is to say and can utilize mimo channel to improve the wireless channel capacity exponentially, under the situation that does not increase bandwidth and antenna transmission power, the availability of frequency spectrum can improve exponentially.Utilize the MIMO technology can improve the capacity of channel, the while also can be improved the reliability of channel, reduces the error rate.
Stipulate in the IEEE802.20 standard that MIMO is divided into two kinds of patterns and carries out transfer of data: single codeword (Single Code Word, SCW) pattern and many code words (Multiple Code Word, MCW) pattern.
Referring to Fig. 2, be the transmission structure schematic diagram of MCW pattern mimo system in the prior art.The MCW pattern is meant receiving terminal according to characteristic of channel prediction modulation coding mode and transfer of data number of plies M, a kind of modulation coding mode of each layer feedback.The base station is used independently coded system to M data flow according to business demand and channel situation this moment, and coding back M data stream of formation carries out parallel transmission respectively, and each data flow is called one deck.
Referring to Fig. 3, be the structural representation of the receiver of MCW pattern mimo system in the prior art.
The MIMO receiver is for using linear least mean-square poor (Minimum Mean Square Error, MMSE) Jun Heng continuous interference eliminated (Successive Interference Cancellation, SIC) receiver.The SIC receiver is at first attempted the ground floor data of decoding, if the ground floor data are correctly decoded, promptly by cyclic redundancy check (CRC) (Cyclic Redundancy Check, CRC), receiver carries out interference eliminated to the ground floor data, attempts decoding second layer data then, and the like.If certain layer data decoding error does not then carry out interference eliminated to this layer data, (None Acknowledge NACK) gives transmitting terminal, requires transmitting terminal to retransmit this layer data but send wrong responses.
The difference of the transfer of data of the mimo system of SCW pattern and retransmission processes and MCW pattern is that under the SCW pattern, receiving terminal is according to characteristic of channel prediction modulation coding mode and transfer of data number of plies M, at a kind of modulation coding mode of all layer feedbacks.Transmitting terminal adopts at this moment with a kind of coded system M data stream is encoded, and constitutes the M layer data and carries out parallel transmission.
In the IEEE802.20 scheme, use the HARQ data re-transmission mechanism of SIC receiver to be called BL (blanking layers).In transmitting terminal transmission data procedures, if N is arranged in certain transmission course, and (N＜=M) layer data is received and rectifies really decoding, receiving terminal feeds back nack message (being that the M-N layer data is not correctly decoded) to transmitting terminal, then transmitting terminal when transmitting data next time, on the successful data transfer layer of decoding, do not transmit any new encoding block data flow, the incremental redundancy information of the M-N layer data stream that only transmission is not correctly decoded on not successful M-N data transfer layer, transmitting terminal is distributed in power averaging on the M-N layer that needs the transmission data simultaneously.
Adopt the MIMO data re-transmission mechanism of prior art, when transmitting terminal carries out data re-transmission according to the nack message of receiving terminal feedback, on the data transfer layer of transmission success, do not transmit any new encoding block, therefore, as long as the data flow of current all layers is fully successfully decoding not, then new data packets just can't be transmitted.This data re-transmission mechanism of prior art can influence real time of data transmission and reduce the unit interval volume of transmitted data, causes the overall performance of system to descend, and reduces data transmission efficiency and power system capacity.
Summary of the invention
The invention provides a kind of data repeating method of multi-input multi-output system, in order to data re-transmission real-time difference and the low problem of data transmission rate in the mimo system in the solution prior art.
The present invention provides a kind of data sending terminal equipment of multi-input multi-output system in addition.
The inventive method comprises step:
Transmitting terminal obtains the message that is not correctly decoded data of receiving terminal feedback;
Transmitting terminal is not correctly decoded on the transport layer of data in transmission and resends the redundant information that this is not correctly decoded data, and sends new data on the transport layer of the successful decoded data of transmission.
According to said method of the present invention, transmitting terminal send described be not correctly decoded data and described new data before, describedly be not correctly decoded the transport layer of data and the transport layer of the described successful decoded data of transmission is redistributed transmitting power for transmitting.
Transmitting terminal is distributed to described transmission and is not correctly decoded the transmitting power of transport layer of data greater than the transmitting power of the transport layer of distributing to described transmission new data.
When having a plurality of transport layer that is not correctly decoded data, transmitting terminal is that wherein each transport layer is distributed identical or different transmitting power;
When having a plurality of transport layer that is correctly decoded data, transmitting terminal is that wherein each transport layer is distributed identical or different transmitting power.
In the said method, transmitting terminal according to the quality of service information of receiving terminal feedback or/and the Channel Transmission situation is carried out power division.
The data sending terminal equipment of multi-input multi-output system provided by the invention comprises:
Feedback signal detection module, data transmission blocks; Also comprise the data retransmission adjusting module, be connected with described data transmission blocks with described feedback signal detection module respectively;
Described feedback signal detection module starts described data retransmission adjusting module after receiving the answer signal of reception error in data of receiving terminal feedback;
Described data retransmission adjusting module is according to the response message of described reception error in data, be not correctly decoded in transmission and place this on the transport layer of data and be not correctly decoded the redundant information of data, on the transport layer of the successful decoded data of transmission, place new data, and start described data transmission blocks and send adjusted data retransmission.
In the said equipment, also comprise the data retransmission power regulation module, be connected with described data transmission blocks with described feedback signal detection module respectively;
Described feedback signal detection module starts described data retransmission power regulation module after receiving the answer signal of reception error in data of receiving terminal feedback;
Described data retransmission power regulation module is that the described transport layer that is not correctly decoded data of transmission is redistributed transmitting power with the transport layer of the described successful decoded data of transmission, and starts described data transmission blocks according to the transmitting power transmission data retransmission that distributes.
Described data retransmission power regulation module is distributed to described transmission and is not correctly decoded the transmitting power of transport layer of data greater than the transmitting power of the transport layer of distributing to described transmission new data.
Described data retransmission power regulation module according to the quality of service information of receiving terminal feedback or/and the Channel Transmission situation is carried out power division.
Beneficial effect of the present invention is as follows:
(1) in the data re-transmission process of mimo system provided by the invention, when transmitting terminal is not received the end correctly-decoded data to the receiving terminal re-transmission, transmitting the redundant information that continues this layer data of transmission on this transport layer that is not correctly decoded data, simultaneously, transmitting the new data of transmission on the transport layer that has been correctly decoded data, thereby improved the data volume of mimo system transmission per unit of time, reduced the time delay of transfer of data.
(2) before the transmitting terminal data retransmission, redistribute the transmitting power of each transport layer, make transmission be not correctly decoded data redundant information the layer transmitting power greater than the transmission new data the layer transmitting power, thereby guarantee that as far as possible receiving terminal decodes again to correctly-decoded data not, promote the overall performance of mimo system.
Description of drawings
Fig. 1 is the principle schematic of mimo system in the prior art;
Fig. 2 is the transmission structure schematic diagram of MCW pattern mimo system in the prior art;
Fig. 3 is the structural representation of the receiver of MCW pattern mimo system in the prior art;
Fig. 4 is the data re-transmission schematic flow sheet of mimo system of the present invention;
Fig. 5 is the data sending terminal equipment structural representation of mimo system of the present invention.
Embodiment
The invention provides a kind of data repeating method of mimo system, its principle is: transmitting terminal is after knowing that receiving terminal is not correctly decoded data-signal, be not correctly decoded on the transport layer of data in transmission and resend the incremental redundancy information that this is not correctly decoded data, and on the transport layer of the successful decoded data of transmission, send new data, simultaneously, before sending data, also can be each data transfer layer and redistribute power, to reach best data transmission efficiency.
Referring to Fig. 4, be the data re-transmission schematic flow sheet of mimo system of the present invention, concrete steps comprise:
S10, transmitting terminal send substream of data by each transfer of data course receiving terminal.
Suppose that (can be determined by the precoding transmission mechanism of mimo system by the substream of data number that transmitting terminal sends to M substream of data of receiving terminal transmission for transmitting terminal; not within protection range of the present invention; do not describe in detail at this); each substream of data uses a data transfer layer, and goes out by a plurality of antenna transmission of transmitting terminal.
S20, receiving terminal are decoded after receiving data, and judge whether the substream of data of receiving all is correctly decoded, if all substream of data all are correctly decoded, and execution in step S60 then; Otherwise, execution in step S30.
Receiving terminal is at first to first substream of data that receives (the i.e. substream of data that transmits on first data transfer layer, hereinafter referred to as the ground floor data, decode and by that analogy), if decoding correct (as passing through CRC check), then the ground floor data are carried out interference eliminated, the second layer data of decoding then, and by that analogy, successively all data Layers are decoded.If certain layer or some layer data decoding error then do not carry out interference eliminated to these layer data, but send nack message to transmitting terminal when feedback cycle arrives, carry the information of the data Layer of decoding error.
For example, receiving terminal is judged N, and (the layer data decoding error of N≤M) is then to transmitting terminal feedback nack message, the information of carrying N layer data decoding error.
S30, judge when all substream of data not being correctly decoded when receiving terminal, to transmitting terminal feedback nack message.
After S40, transmitting terminal are received nack message, before sending data, redistribute the signal transmission power of each data transfer layer.
In order to reduce substream of data generation certain disturb of new transmitted encoding block substream of data as far as possible, can redistribute power to original encoding block.Receiving terminal is that different transport layers is distributed different power, and the entire system performance is got a promotion.
Transmitting terminal is according to quality of service (the Quality of Service of receiving terminal feedback, QoS) information and channel situation, for each data transfer layer is redistributed signal transmission power, and guarantee that the transmitting power of the transport layer of each error of transmission decoded data stream is correctly decoded the transmitting power of the transport layer of substream of data greater than each transmission.
S50, transmitting terminal retransmit the redundant information of this layer data, so that receiving terminal is decoded once more to this layer data on the layer of error of transmission decoded data when sending data; Simultaneously, be correctly decoded the new data of transmission on the layer of data in transmission.
After receiving terminal is received data, carry out data decode according to the described process of step S20.
S60, judge when all substream of data all are correctly decoded when receiving terminal, to transmitting terminal feeding back ACK information.
After S70, transmitting terminal are received ACK information, continue to carry out the follow-up flow process of transfer of data, send data as continuing, or judgment data sends the back end data transfer process that finishes, concrete steps do not describe in detail at this not within protection scope of the present invention.
Below by an embodiment data re-transmission process of the present invention is described in detail.
The supposition transmitting terminal is desired to send 4 layer data to receiving terminal in the present embodiment, and its transfer of data and retransmission processes are:
When 1, transmitting terminal transmits data for the first time, send 4 substream of data to receiving terminal, each substream of data uses a data transfer layer.
2, after receiving terminal is received 4 layer data, begin one by one 4 layer data to be decoded from the ground floor data, in this process, receiving terminal is correctly decoded ground floor and second layer data, and the 3rd layer and the 4th layer data are failed to be correctly decoded.When receiving terminal arrives at feedback cycle,, wherein carry the information that the 3rd layer and the 4th layer data are not correctly decoded to transmitting terminal feedback nack message.
3, after transmitting terminal is received nack message, before sending data for the second time, redistribute the signal transmission power of 4 data transfer layers.
After transmitting terminal is received the nack message of receiving terminal feedback,, be that 4 data transfer layers are redistributed signal transmission power according to the QoS information and the channel situation of receiving terminal feedback.The gross power of supposing all 4 data transfer layers is P, and concrete allocation proportion is: for ground floor and the second layer respectively distribute P/6, be the 3rd layer and the 4th layer and respectively distribute P/3.Allocation proportion can be formulated as the case may be by transmitting terminal, is not limited to above-mentioned ratio.The power proportions of distributing to every layer also can be unequal, as long as the transmitting power that satisfies the 3rd layer and the 4th layer is respectively greater than the transmitting power of the ground floor and the second layer.
4, transmitting terminal is when sending data for the second time, on the 3rd layer, retransmit not being received of transmitting for the first time and rectify the really redundant information of the 3rd layer data of decoding, on the 4th layer, retransmit not being received of transmitting for the first time and rectify the really redundant information of the 4th layer data of decoding, the new data of transmission on the ground floor and the second layer.
5, after receiving terminal is received data, ground floor to the four layer data of decoding successively, and all decode successfully.
Based on said method, the invention provides a kind of data sending terminal equipment of mimo system.
Referring to Fig. 5, data sending terminal equipment structural representation for mimo system of the present invention, this equipment specifically comprises: feedback signal detection module, data transmission blocks, data retransmission adjusting module and data retransmission power regulation module, and other conventional data transmission blocks (not indicating in the drawings).The data retransmission adjusting module is connected with data transmission blocks with the feedback signal detection module respectively; The data retransmission power regulation module is connected with data transmission blocks with the feedback signal detection module respectively.
The feedback signal detection module starts the data retransmission adjusting module after receiving the answer signal (NACK signal) of reception error in data of receiving terminal feedback.The data retransmission adjusting module is according to nack message, is not correctly decoded in transmission to place this on the transport layer of data and be not correctly decoded the redundant information of data, places new data on the transport layer of the successful decoded data of transmission.
The feedback signal detection module also starts the data retransmission power regulation module after receiving the NACK signal of receiving terminal feedback.The data retransmission power regulation module is not correctly decoded the transport layer of data for transmission and the transport layer of the described successful decoded data of transmission is redistributed transmitting power.
Data transmission blocks sends data retransmission according to the indication of data retransmission adjusting module and data retransmission power regulation module.
The data retransmission power regulation module when adjusting power division, according to the quality of service information of receiving terminal feedback or/and the Channel Transmission situation is carried out power division.Distribute to transmission and be not correctly decoded the transmitting power of transport layer of data greater than the transmitting power of transport layer of distributing to the transmission new data.
By above description as can be known, in the data re-transmission process of mimo system provided by the invention, when transmitting terminal is not received the end correctly-decoded data to the receiving terminal re-transmission, transmitting the redundant information that continues this layer data of transmission on this layer that is not correctly decoded data, simultaneously, on other layers, i.e. transmission has been correctly decoded the layer of data and has gone up the new data of transmission, thereby improved the data volume of mimo system transmission per unit of time, reduced the time delay of transfer of data.In addition, before the transmitting terminal data retransmission, redistribute the transmitting power of each transport layer, make transmission be not correctly decoded data redundant information the layer transmitting power greater than the transmission new data the layer transmitting power, thereby guarantee that as far as possible receiving terminal decodes again to correctly-decoded data not, promote the overall performance of mimo system.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (9)
1. the data repeating method of a multi-input multi-output system is characterized in that, comprises step:
Transmitting terminal obtains the message that is not correctly decoded data of receiving terminal feedback;
Transmitting terminal is not correctly decoded on the transport layer of data in transmission and resends the redundant information that this is not correctly decoded data, and sends new data on the transport layer of the successful decoded data of transmission.
2. the method for claim 1, it is characterized in that, transmitting terminal send described be not correctly decoded data and described new data before, describedly be not correctly decoded the transport layer of data and the transport layer of the described successful decoded data of transmission is redistributed transmitting power for transmitting.
3. method as claimed in claim 2 is characterized in that, transmitting terminal is distributed to described transmission and is not correctly decoded the transmitting power of transport layer of data greater than the transmitting power of the transport layer of distributing to described transmission new data.
4. method as claimed in claim 3 is characterized in that, when having a plurality of transport layer that is not correctly decoded data, transmitting terminal is that wherein each transport layer is distributed identical or different transmitting power;
When having a plurality of transport layer that is correctly decoded data, transmitting terminal is that wherein each transport layer is distributed identical or different transmitting power.
5. method as claimed in claim 2 is characterized in that, transmitting terminal according to the quality of service information of receiving terminal feedback or/and the Channel Transmission situation is carried out power division.
6. the data sending terminal equipment of a multi-input multi-output system comprises feedback signal detection module, data transmission blocks, it is characterized in that, also comprises the data retransmission adjusting module, is connected with described data transmission blocks with described feedback signal detection module respectively;
Described feedback signal detection module starts described data retransmission adjusting module after receiving the answer signal of reception error in data of receiving terminal feedback;
Described data retransmission adjusting module is according to the response message of described reception error in data, be not correctly decoded in transmission and place this on the transport layer of data and be not correctly decoded the redundant information of data, on the transport layer of the successful decoded data of transmission, place new data, and start described data transmission blocks and send adjusted data retransmission.
7. equipment as claimed in claim 6 is characterized in that, also comprises the data retransmission power regulation module, is connected with described data transmission blocks with described feedback signal detection module respectively;
Described feedback signal detection module starts described data retransmission power regulation module after receiving the answer signal of reception error in data of receiving terminal feedback;
Described data retransmission power regulation module is that the described transport layer that is not correctly decoded data of transmission is redistributed transmitting power with the transport layer of the described successful decoded data of transmission, and starts described data transmission blocks according to the transmitting power transmission data retransmission that distributes.
8. equipment as claimed in claim 7 is characterized in that, described data retransmission power regulation module is distributed to described transmission and is not correctly decoded the transmitting power of transport layer of data greater than the transmitting power of the transport layer of distributing to described transmission new data.
9. equipment as claimed in claim 7 is characterized in that, described data retransmission power regulation module according to the quality of service information of receiving terminal feedback or/and the Channel Transmission situation is carried out power division.
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| CN102239649A (en) * | 2008-12-02 | 2011-11-09 | Lg电子株式会社 | Method for transmitting reference signals in a downlink multiple input multiple output system |
| CN102237949A (en) * | 2010-04-21 | 2011-11-09 | 华为技术有限公司 | Method, equipment and system for transmitting demodulation reference signal (RMRS) |
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| CN108886422A (en) * | 2016-03-24 | 2018-11-23 | 瑞典爱立信有限公司 | Method and apparatus for determining the value of configured transmission |
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| CN102239649B (en) * | 2008-12-02 | 2014-03-19 | Lg电子株式会社 | Method for transmitting reference signals in a downlink multiple input multiple output system |
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| CN102239649A (en) * | 2008-12-02 | 2011-11-09 | Lg电子株式会社 | Method for transmitting reference signals in a downlink multiple input multiple output system |
| US8913581B2 (en) | 2008-12-02 | 2014-12-16 | Lg Electronics Inc. | Method for transmitting reference signals in a downlink multiple input multiple output system |
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| CN102237949A (en) * | 2010-04-21 | 2011-11-09 | 华为技术有限公司 | Method, equipment and system for transmitting demodulation reference signal (RMRS) |
| CN102237949B (en) * | 2010-04-21 | 2014-03-12 | 华为技术有限公司 | Method, equipment and system for transmitting demodulation reference signal (RMRS) |
| CN105636179A (en) * | 2014-11-27 | 2016-06-01 | 华为终端（东莞）有限公司 | Method and apparatus for determining transmitting power |
| CN108886422A (en) * | 2016-03-24 | 2018-11-23 | 瑞典爱立信有限公司 | Method and apparatus for determining the value of configured transmission |
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