WO2010124418A1 - 一种用于控制数据重传的方法和装置 - Google Patents

一种用于控制数据重传的方法和装置 Download PDF

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Publication number
WO2010124418A1
WO2010124418A1 PCT/CN2009/000462 CN2009000462W WO2010124418A1 WO 2010124418 A1 WO2010124418 A1 WO 2010124418A1 CN 2009000462 W CN2009000462 W CN 2009000462W WO 2010124418 A1 WO2010124418 A1 WO 2010124418A1
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WIPO (PCT)
Prior art keywords
data
retransmission
retransmitted
precoding matrix
data units
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PCT/CN2009/000462
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English (en)
French (fr)
Inventor
刘瑾
朱旭东
杨林
杨涛
Original Assignee
上海贝尔股份有限公司
阿尔卡特朗讯
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 上海贝尔股份有限公司, 阿尔卡特朗讯 filed Critical 上海贝尔股份有限公司
Priority to CN200980155656.8A priority Critical patent/CN102301631B/zh
Priority to PCT/CN2009/000462 priority patent/WO2010124418A1/zh
Publication of WO2010124418A1 publication Critical patent/WO2010124418A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607Details of the supervisory signal
    • H04L1/1671Details of the supervisory signal the supervisory signal being transmitted together with control information
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0025Transmission of mode-switching indication
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/02Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity

Definitions

  • the present invention relates to retransmission control, and more particularly to retransmission control of multiple data transmitted by a mobile terminal using spatial multiplexing. Background technique
  • a user can use up to two transport blocks or codewords in one subframe of each uplink component carrier. Codeword ).
  • the layer interference cancellation gain is obtained for each transport block by using separate modulation schemes and coding algorithms.
  • time domain layer shifting or no time domain layer shifting can be used. If the time domain layer shift is used, for all data blocks of one user in one subframe, in order to reduce the physical hybrid automatic repeat request indication channel (PHICH) resource occupied by each user, the system capacity is not reduced, the base station Only one hybrid automatic repeat request (HARQ) feedback is sent. If all the data blocks transmitted by a user in one subframe are correctly decoded by the base station, the base station transmits a 1-bit acknowledgement (ACK), and the mobile terminal does not need to retransmit the data block.
  • PHICH physical hybrid automatic repeat request indication channel
  • the base station sends a 1-bit negative acknowledgement (NACK), and the mobile terminal needs to retransmit all the data blocks.
  • NACK negative acknowledgement
  • This way of using a 1-bit retransmission feedback to indicate the spatial multiplexing of the reception performance of multiple data blocks is also called HARQ-ACK spatial bundling.
  • HARQ-ACK space binding can be used to improve the throughput of the system.
  • the decoded data blocks are retransmitted together. Retransmitting a block of data that has been correctly received wastes system resources, thereby degrading system performance, such as throughput.
  • retransmitting data blocks that have been correctly received by the base station will also interfere with another data block that really needs to be retransmitted, reducing the retransmission success rate and adversely affecting system performance.
  • the present invention provides a technical solution for controlling data retransmission.
  • multiple data transmitted by using a spatial multiplexing manner for one mobile terminal The unit does not change the number of bits of the retransmission feedback indication, and sends a retransmission feedback indication, a precoding matrix indication, and a rank indication by the network device, so that the mobile terminal only retransmits according to the information included in the foregoing three indications.
  • a method for transmitting a retransmission instruction in a network device of a mobile communication system comprising the steps of: receiving a plurality of mobile terminals transmitting in a spatial multiplexing manner Determining, according to a receiving performance indicator of each of the plurality of data units, a data unit that needs to be retransmitted, wherein the data unit that needs to be retransmitted is part or all of the plurality of data units; Transmitting a retransmission feedback indication, a precoding matrix indication, and a rank indication to the mobile terminal, and using the information included in the three indications to inform the mobile terminal to retransmit only the data unit that needs to be retransmitted.
  • a method for retransmitting data in a mobile terminal of a mobile communication system comprising the steps of: receiving a retransmission feedback indication sent by a network device, one a precoding matrix indication and a rank indication, the three indications being set by the network device according to the received plurality of data units that are sent by the mobile terminal in a spatial multiplexing manner; and including according to the three indications Information, determining a data unit that needs to be retransmitted, where the data unit that needs to be retransmitted is the multiple data sheets Part or all of the yuan.
  • the technical solution of the present invention solves the problem that the retransmission cannot be effectively implemented in the case of HARQ-ACK space binding.
  • the data unit that needs to be retransmitted is no longer only all the data units that have been transmitted, and the data unit that has been correctly received by the base station does not need to be retransmitted, thereby reducing the interference of the data unit that needs to be retransmitted, and improving the success rate of retransmission. .
  • the corresponding transmission power is saved, thereby increasing the capacity of the system.
  • a retransmission instruction transmitting apparatus for transmitting a retransmission instruction in a network device of a mobile communication system, the apparatus comprising: a first receiving apparatus for receiving a plurality of data units transmitted by the mobile terminal in a spatial multiplexing manner; a first retransmission determining device configured to determine data to be retransmitted according to a receiving performance indicator of each of the plurality of data units a unit, the data unit to be retransmitted is part or all of the plurality of data units; and a first transmitting device, configured to send a retransmission feedback indication, a precoding matrix indication, and a rank indication to the The mobile terminal, by using the information included in the three indications, informs the mobile terminal to retransmit only the data unit that needs to be retransmitted.
  • a data retransmission apparatus for retransmitting data in a mobile terminal of a mobile communication system, the apparatus comprising: a second receiving apparatus for receiving by a network a retransmission feedback indication sent by the device, a precoding matrix indication, and a rank indication, where the three indications are set by the network device according to the received multiple data units that are sent by the mobile terminal in a spatial multiplexing manner. And a second retransmission determining device, configured to determine, according to information included in the three indications, a data unit that needs to be retransmitted, where the data unit that needs to be retransmitted is part of the multiple data unit or All.
  • FIG. 1 is a flow chart showing a method for transmitting a retransmission instruction in a network device of a mobile communication system according to the present invention
  • FIG. 2 is a flow chart showing a method for retransmitting data in a mobile terminal of a mobile communication system according to the present invention
  • FIG. 3 is a schematic diagram of a retransmission instruction transmitting apparatus for transmitting a retransmission instruction in a network device of a mobile communication system according to the present invention
  • FIG. 4 is a schematic diagram of a data retransmission apparatus for retransmitting data in a mobile terminal of a mobile communication system according to the present invention. detailed description
  • the present invention first provides a method for transmitting retransmission instructions in a network device of a mobile communication system.
  • the network device may be a base station, a radio network controller (RNC), or the like, that is, a device that can provide a control function.
  • RNC radio network controller
  • Figure 1 is a flow diagram showing a method for transmitting a retransmission instruction in a network device of a mobile communication system in accordance with the present invention.
  • the method includes step S101 of receiving a plurality of data units transmitted by a mobile terminal in a spatial multiplexing manner.
  • Each of the plurality of data units uses a plurality of independent encoding methods or modulation methods.
  • the plurality of data units can be a plurality of data blocks or a plurality of code words.
  • the plurality of data units may be respectively transmitted by a plurality of antennas of the mobile terminal, and each of the data units may also be split into a plurality of parts, which are respectively transmitted by a plurality of antennas of the mobile terminal.
  • the method further includes a step S102, determining, according to a receiving performance indicator of each of the plurality of data units, a data unit that needs to be retransmitted, where the data unit that needs to be retransmitted is part or all of the plurality of data units .
  • the network device can determine whether a data unit needs to be retransmitted according to the check code of the received data unit.
  • the base station When received When the performance index of the data unit is better than a predetermined performance indicator threshold, the base station may correctly receive the data unit; when the performance index of the received data unit is worse than a predetermined performance indicator threshold, the base station may not be correctly received. Go to the data unit.
  • a data unit that is not correctly received by the base station requires the mobile terminal to resend. In some cases, all data units need to be retransmitted. In some cases, only some of the data units need to be retransmitted. In some cases, there is no need to retransmit any data units.
  • the method further includes a step S103, transmitting a retransmission feedback indication, a precoding matrix indication, and a rank indication to the mobile terminal, and informing, by the information included in the three indications, that the mobile terminal only retransmits the requirement Retransmitted data unit.
  • the base station For each of the data units sent by the mobile terminal, for each indication of the above three indications, the base station sends only one indication information for sharing the multiple data units, that is, the HARQ-ACK space binding introduced at the beginning of this document. .
  • the retransmission feedback indication may use a 1-bit ACK/NACK to indicate whether the received data unit is all correctly received by the base station or that any data unit is not correctly received by the base station.
  • the information contained in the precoding matrix indication and the rank indication is used to indicate the precoding matrix to be used by the data unit transmitted by the mobile terminal.
  • the method further includes: before step S103: setting the retransmission feedback indication as retransmission, and precoding the precoding matrix indication
  • the matrix is set to a precoding matrix that is required to be used according to system performance requirements, and the rank indication is set to the number of data streams of the plurality of data units.
  • the retransmission feedback indication may indicate that retransmission is required by sending a NACK command, that is, multiple data units transmitted by the mobile terminal are not correctly received by the base station.
  • the network device selects the precoding that the mobile terminal should use to transmit all of the multiple data units.
  • the precoding selected by the network device for the mobile terminal may be the same as or different from the precoding used by the mobile terminal to transmit data last time.
  • Data streams can be defined in a number of ways, such as in LTE-advanced systems, The flow is the layer.
  • the number of data streams of a plurality of data units refers to the number of all data streams included in a plurality of data units, rather than just one data unit.
  • the number of data streams of a data unit can be determined by the mobile terminal or network device according to predefined criteria. Since all the data units need to be retransmitted, the configuration of the three indications at this time does not need to distinguish between which data units or units, but multiple data units as a whole, and is configured according to the performance required by the system. .
  • the method further includes the following steps: the retransmission feedback is indicated as retransmission, and the precoding matrix indicated by the precoding matrix is set as a precoding matrix having a selection characteristic, where the number of columns of the matrix is the retransmission required The number of data streams of the data unit, and the rank indication is set to the number of data streams of the data unit that needs to be retransmitted.
  • the retransmission feedback indication may indicate that retransmission is required by sending a NACK command, that is, multiple data units transmitted by the mobile terminal are not correctly received by the base station.
  • a precoding matrix having a selection characteristic means that the values in the precoding matrix are both 0 or 1. Since the values in the precoding matrix are both 0 or 1, the precoding matrix can use 0 and 1 to indicate which one or which mobile terminal should retransmit, in addition to the precoding matrix that the mobile terminal should use. Data unit. For example, 1 means that retransmission is required, and 0 means no retransmission is required.
  • the mobile communication network device pre-defines or dynamically sets a transmit antenna used by a plurality of data units and a layer shifting pattern of the plurality of data units.
  • the base station selects a precoding matrix having a selection characteristic to inform the mobile terminal which of the plurality of data units needs to be retransmitted A data unit.
  • the number of data streams of data units that need to be retransmitted refers to the number of all data streams contained in all data units that need to be retransmitted, rather than just one data unit.
  • the number of data streams of a data unit can be determined by the mobile terminal or network device according to predefined criteria.
  • the rank indicated by the rank indication is smaller than the multiple data units sent by the mobile terminal.
  • the rank used can inform the mobile terminal that the data unit it transmitted is not correctly received by the base station.
  • the base station can further inform the mobile terminal through a precoding matrix having only two values of 0 and 1. Specifically, which or which data unit needs to be retransmitted.
  • the present invention also provides a method for retransmitting data in a mobile terminal of a mobile communication system.
  • FIG. 2 is a flow chart showing a method for retransmitting data in a mobile terminal of a mobile communication system according to the present invention.
  • the method includes step S201, receiving a retransmission feedback indication sent by a network device, a precoding matrix indication, and a rank indication, where the three indications are received by the network device according to the
  • the mobile terminal is set by using a plurality of data units transmitted by spatial multiplexing.
  • the mobile terminal After the mobile terminal transmits multiple data units in spatial multiplexing mode, it needs to determine the next operation according to the feedback of the base station, that is, retransmit or send new data.
  • the method further includes a step S202, determining, according to information included in the three indications, a data unit that needs to be retransmitted, where the data unit that needs to be retransmitted is part or all of the plurality of data units.
  • the mobile terminal only needs to judge whether it is necessary to retransmit data according to a retransmission feedback indication.
  • the mobile terminal needs to determine a retransmission scheme according to the information included in the three indications, that is, only retransmit the data unit that is not correctly received by the base station, instead of simply as long as the data unit is not When the base station receives it correctly, it retransmits all the data units.
  • the step further includes, after step S202: transmitting all of the plurality of data units.
  • the mobile terminal Since the mobile terminal receives the retransmission indication, and the content of the rank indication is the same as the content of the rank indication corresponding to the data previously sent by the mobile terminal, the mobile terminal can determine that all the data units sent last time are not correctly received by the base station. , need to resend all.
  • the precoding matrix indicated by the precoding matrix is a matrix having a selection characteristic, and the number of the rank indication is smaller than the number of data streams of the multiple data units: S202 further includes sub-steps, indicating according to the precoding matrix The precoding matrix determines the data unit that needs to be retransmitted; and after step S202, further includes the step of transmitting the data unit that needs to be retransmitted.
  • the mobile terminal Since the mobile terminal receives the retransmission indication, and the content of the rank indication is smaller than the content of the rank indication corresponding to the data previously sent by the mobile terminal, the mobile terminal can determine that part of the plurality of data units sent last time are correctly received by the base station. Some parts are not retransmitted by the base station, and some data units need to be retransmitted. Based on the layer shifting pattern of the transmitting antenna or the plurality of data units used by the plurality of data units, the mobile terminal determines, according to the precoding matrix having the selected characteristic, which data units or units need to be retransmitted, for example, in the matrix. 1 corresponds to the need to retransmit, 0 corresponds to no retransmission.
  • the precoding matrix indicated by the precoding matrix is a matrix having no selection characteristic, and when the number of the rank indication is smaller than the number of data streams of the multiple data units, The number of data units that need to be retransmitted is zero.
  • the mobile terminal Since the mobile terminal receives the retransmission indication, and the content of the rank indication is smaller than the content of the rank indication corresponding to the data previously sent by the mobile terminal, the mobile terminal should also read a selective characteristic according to the precoding matrix indication and the rank indication.
  • the indication of the precoding matrix but the mobile terminal reads a precoding matrix having no selection characteristics from the codebook according to the indication. In this case, the mobile terminal can determine that the transmission of the retransmission feedback indication has an error, and the correct retransmission feedback indication should not require retransmission, so the mobile terminal does not retransmit the transmitted data, but waits for a new one. Instruct to proceed to the next step.
  • the retransmission control mode adopts the existing retransmission control.
  • the method is to select the precoding matrix according to the system performance requirements.
  • one mobile terminal can transmit data using two transmit antennas, and each mobile terminal can use up to two data units, such as data blocks, in one subframe of each uplink component carrier frequency.
  • the base station sends retransmission feedback to the mobile terminal through a 1-bit ACK/NACK command, and passes a precoding matrix indication (PMI) and a rank indication. ( RI ) informs the mobile terminal of the precoding matrix to be used.
  • PMI precoding matrix indication
  • RI rank indication
  • the base station informs the mobile terminal of which data unit needs to be specifically retransmitted through the combination information included in the three indications of ACK/NACK, PMI and RI.
  • Table 1 shows the codebook tables for the two transmit antennas in the LTE-Aduned system.
  • the number of layers is the total number of data streams contained in two data units. When the number of layers is 1, there are 6 precoding matrices that can be used; when the number of layers is 2, there is only one precoding matrix that can be used.
  • a mobile terminal with two transmit antennas transmits two data blocks in a spatial multiplexing manner.
  • the base station receives the two data blocks.
  • the base station When both data blocks are correctly received by the base station, the base station transmits a 1-bit ACK message to the mobile terminal. After receiving the ACK, the mobile terminal determines that the base station has received the data block correctly and waits for a new command.
  • the base station transmits a 1-bit NACK information to the mobile terminal, and uses PMI and RI to inform the mobile terminal that the codebook index is 0 and the stratum number is 2.
  • the mobile terminal determines that at least one data unit is not correctly received by the base station, and then determines the number of layers by the RI to be 2, that is, needs The number of streams sent is the same as the number of streams sent last time. Therefore, the mobile terminal can determine that it is necessary to retransmit both data units and retransmit the two data units to the base station.
  • the base station When one of the two data blocks is correctly received by the base station and one is not correctly received by the base station, the base station transmits a 1-bit NACK message to the mobile terminal, and according to which data block needs to be retransmitted, using PMI and RI To inform the mobile terminal of the codebook index and the number of layers.
  • the base station selects a precoding matrix with a selection characteristic to inform the mobile terminal which data of the two data blocks needs to be retransmitted.
  • the precoding matrix with the selection characteristics in Table 1 is a precoding matrix with a codebook index of 4 and 5 and a layer number of 1.
  • the base station selects a precoding matrix with a codebook index of 4 and a layer number of 1.
  • the base station selects a precoding matrix with a codebook index of 5 and a layer number of 1 and indicates that retransmission is required. , 0 means no retransmission is required.
  • the mobile terminal After receiving the NACK, the mobile terminal determines that at least one data unit is not correctly received by the base station, and then determines the number of layers by the RI to be 1, that is, the number of data streams that need to be sent is smaller than the number of data streams sent last time. Therefore, the mobile terminal can determine that it is only necessary to retransmit one data unit.
  • the mobile terminal reads the precoding matrix in the codebook according to PMI and RI. When two data units are respectively transmitted by the antenna 1 and the antenna 2, if the mobile terminal reads the precoding matrix, it can be determined that it is the last antenna that needs to be retransmitted.
  • the mobile terminal transmits the data unit transmitted by the antenna 1 to the base station again by the antenna 1, if the mobile terminal reads the precoding matrix It is necessary to retransmit the data unit that was last transmitted at the antenna 2, and the mobile terminal retransmits the data unit transmitted by the antenna 2 to the base station by the antenna 2.
  • the base station When the data unit retransmitted by one antenna is correctly received by the base station, the base station sends an ACK message to the mobile terminal, and after receiving the ACK information, the mobile terminal determines to retransmit. The data unit has been correctly received by the base station and is waiting for a new operational command.
  • the data retransmission control method is the same as that without the HARQ-ACK space binding.
  • the base station sends a NACK message to the mobile terminal, and according to system performance requirements, such as system capacity, carrier-to-interference ratio, etc., the number of layers in Table 1 is 1, and the six precoding matrices in the coding indexes 0 to 5 are The mobile terminal determines a corresponding precoding matrix.
  • the mobile terminal After the mobile terminal transmits two data units in a spatial multiplexing manner, the NACK information sent by the base station is received, and the number of layers indicated by the RI is 1, but according to the PMI and the RI, a non-selective characteristic is read from the codebook. Matrix, such as.
  • the mobile terminal is able to determine that an ACK/NACK command transmission has an error and the NACK information is actually an ACK message. Therefore, the mobile terminal does nothing and waits for new instructions.
  • Figure 3 is a diagram showing a retransmission instruction transmitting apparatus 300 for transmitting a retransmission instruction in a network device of a mobile communication system in accordance with the present invention.
  • the retransmission instruction transmitting apparatus 300 includes: a first receiving apparatus 301 for receiving a plurality of data units transmitted by a mobile terminal in a spatial multiplexing manner; and a first retransmission determining apparatus 302. And determining, according to a receiving performance indicator of each of the plurality of data units, a data unit that needs to be retransmitted, where the data unit that needs to be retransmitted is part or all of the plurality of data units; a first sending device 303, configured to send a retransmission feedback indication, a precoding matrix indication, and a rank indication to the mobile terminal, and notify, by using the information included in the three indications, that the mobile terminal only retransmits the The data unit that needs to be retransmitted.
  • the number of the plurality of data units is two, and the retransmission feedback indicates that the resource used is 1 bit.
  • the retransmission instruction transmitting apparatus 300 further includes: a first indication setting means, configured to set the retransmission feedback indication to Retransmission, setting the precoding matrix indicated by the precoding matrix to a precoding matrix to be used according to system performance requirements, and setting the rank indication to the number of data streams of the plurality of data units.
  • the retransmission instruction transmitting apparatus 300 further includes: a second indication setting means for indicating the retransmission feedback as heavy Transmitting, the precoding matrix indicated by the precoding matrix is set as a matrix having a selection characteristic, the number of columns of the matrix is the number of data streams of the data unit to be retransmitted, and the rank indication is set to The number of data streams of the data unit that need to be retransmitted.
  • the precoding matrix indicated by the precoding matrix is two and the number of transmit antennas of the mobile terminal is two, the precoding matrix indicated by the precoding matrix is
  • FIG. 4 is a diagram of a data retransmission apparatus 400 for retransmitting data in a mobile terminal of a mobile communication system in accordance with the present invention.
  • the data retransmission apparatus 400 includes: a second receiving apparatus 401, configured to receive a retransmission feedback indication, a precoding matrix indication, and a rank indication sent by a network device, where the three The indication is set by the network device according to the received plurality of data units that are sent by the mobile terminal in a spatial multiplexing manner; and a second retransmission determining device 402 is configured to be included according to the three indications
  • the information determines a data unit that needs to be retransmitted, and the data unit that needs to be retransmitted is part or all of the plurality of data units.
  • the number of the plurality of data units is two, and the retransmission feedback indicates that the resource used is 1 bit.
  • the data retransmission apparatus 400 further includes: a second transmitting device, configured to send all A plurality of data units are described.
  • the precoding matrix indicated by the precoding matrix is a matrix having a selection characteristic, and when the number of the rank indication is smaller than the number of data streams of the multiple data units,
  • the second retransmission device 402 is further configured to determine, according to the precoding matrix indicated by the precoding matrix, the data unit that needs to be retransmitted; the data retransmission device 400 further includes a third sending device, configured to send the A data unit that needs to be retransmitted.
  • a data unit that needs to be retransmitted is one of the two data units.
  • the precoding matrix indicated by the precoding matrix is a matrix having no selection characteristic, and when the number of the rank indication is smaller than the number of data streams of the multiple data units, The number of data units that need to be retransmitted is zero.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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  • Mobile Radio Communication Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Description

一种用于控制数据重传的方法和装置
技术领域
本发明涉及重传控制, 尤其涉及针对移动终端采用空间复用方式 发送的多个数据的重传控制。 背景技术
在 3GPP的长期演进的进一步演进版本 LTE-advanced系统中,一 个用户在每个上行的组成载频 ( component carrier ) 的一个子帧中, 最多可以使用两个传输块 ( transport block ) 或者码字 (codeword ) 。 每个传输块通过使用独立的调制方式和编码算法可获得层干扰消除 增益。
在 3GPP无线接入网技术第一工作组的会议上, 已经决定可以使 用时域层移位 (layer shifting)或者不使用时域层移位。如果使用时域层 移位, 则针对一个用户在一个子帧中的所有的数据块, 为了减少每个 用户所占用的物理混合自动重传请求指示信道 (PHICH)资源, 不降低 系统容量, 基站只发送一个混合自动重传请求 (HARQ )反馈。 如果 一个用户在一个子帧中所发送的全部数据块都被基站正确解码, 则基 站发送一个 1比特的确认应答( ACK ) ,移动终端不需要重传数据块。 否则, 如果全部数据块中有任何一个没有被基站正确解码, 则基站发 送一个 1比特的否定应答(NACK ) , 移动终端需要将全部数据块重 传。 这种使用一个 1比特的重传反馈来指示空间复用多个数据块的接 收性能的方式也叫做 HARQ-ACK空间绑定 ( spatial bundling ) 。
如果移动终端发送的两个数据块都能够被基站正确解码, 则使用 HARQ-ACK 空间绑定可以提高系统的吞吐率。 但是如果两个数据块 中只有一个不能被基站正确解码, 由于 HARQ-ACK空间绑定不能指 示出哪一个数据块没有被正确解码, 则另外一个已经被正确解码的数 据块也需要和没有被正确解码的数据块一起重传。 则重传已经被正确 接收的数据块会浪费系统资源, 从而降低系统的性能, 如吞吐率等。 此外, 重传已经被基站正确接收的数据块也会对另外一个真正需要重 传的数据块产生干扰,降低了重传成功率,对系统性能造成负面影响。 发明内容
在 HARQ-ACK 空间绑定的情况下, 当移动终端采用空间复用方 式发送的两个数据块中有一个被基站正确解码, 有一个没有被基站正 确解码时, 如果能让移动终端区分被正确解码和没有被正确解码的数据 块, 移动终端就可以只重传没有被正确解码的数据块, 从而提高系统性 能。
为了更好的解决上述考量, 本发明提供了一种用于控制数据重传的 技术方案, 在 HARQ-ACK空间绑定的情况下, 针对一个移动终端采 用空间复用方式所发送的多个数据单元, 不改变重传反馈指示的比特 数目, 通过网络设备发送一个重传反馈指示、 一个预编码矩阵指示以及 一个秩指示, 让移动终端根据上述三个指示中所包含的信息, 仅重传没 有被网络设备正确解码的数据单元。
根据本发明的第一个方面, 提供了一种在移动通信系统的一个网络 设备中用于发送重传指令的方法, 该方法包括以下步骤: 接收由一个移 动终端采用空间复用方式发送的多个数据单元; 艮据所述多个数据单元 中各个数据单元的接收性能指标, 确定需要重传的数据单元, 所述需要 重传的数据单元为所述多个数据单元的部分或者全部; 以及发送一个重 传反馈指示、 一个预编码矩阵指示以及一个秩指示给所述移动终端, 通 过所述三个指示中所包含的信息告知该移动终端仅重传所述需要重传 的数据单元。
根据本发明的第二个方面, 提供了一种在移动通信系统的一个移动 终端中用于重传数据的方法, 该方法包括以下步骤: 接收由一个网络设 备发送的一个重传反馈指示、 一个预编码矩阵指示以及一个秩指示, 所 述三个指示由该网络设备根据接收到的所述移动终端采用空间复用方 式发送的多个数据单元而设定; 以及根据所述三个指示所包含的信息, 确定需要重传的数据单元, 所述需要重传的数据单元为所述多个数据单 元的部分或者全部。
通过本发明的技术方案, 解决了在 HARQ-ACK空间绑定的情况下 不能有效实现重传的问题。 需要重传的数据单元不再只是已经发送的 全部数据单元, 已经被基站正确接收的数据单元不需要重传, 从而降 低了需要重传的数据单元所受到的干扰,提高了重传的成功率。此外, 由于会有一部分数据单元不需要重传, 则节省了相应的发射功率, 从 而提高系统的容量。
根据本发明的第三个方面, 提供了一种在移动通信系统的一个网络 设备中用于发送重传指令的重传指令发送装置, 该装置包括: 一个第一 接收装置, 其用于接收由一个移动终端采用空间复用方式发送的多个数 据单元; 一个第一重传确定装置, 其用于才艮据所述多个数据单元中各个 数据单元的接收性能指标, 确定需要重传的数据单元, 所述需要重传的 数据单元为所述多个数据单元的部分或者全部; 以及一个第一发送装 置, 其用于发送一个重传反馈指示、 一个预编码矩阵指示以及一个秩指 示给所述移动终端, 通过所述三个指示所包含的信息告知该移动终端仅 重传所述需要重传的数据单元。
根据本发明的第四个方面, 提供了一种在移动通信系统的一个移动 终端中用于重传数据的数据重传装置,该装置包括:一个第二接收装置, 其用于接收由一个网络设备发送的一个重传反馈指示、 一个预编码矩阵 指示以及一个秩指示, 所述三个指示由该网络设备根据接收到的所述移 动终端采用空间复用方式发送的多个数据单元而设定; 以及一个第二重 传确定装置, 其用于根据所述三个指示所包含的信息, 确定需要重传的 数据单元, 所述需要重传的数据单元为所述多个数据单元的部分或者全 部。
附图说明
通过阅读参照以下附图所作的对非 P艮制性实施例所作的详细描述, 本发明的上述及其他特征将会更加清晰:
图 1 为根据本发明的一种在移动通信系统的一个网络设备中用于 发送重传指令的方法的流程示意图;
图 2 为^ f艮据本发明的一种在移动通信系统的一个移动终端中用于 重传数据的方法的流程示意图;
图 3为根据本发明的一种在移动通信系统的一个网络设备中用于发 送重传指令的重传指令发送装置的示意图;
图 4 为^ f艮据本发明的一种在移动通信系统的一个移动终端中用于 重传数据的数据重传装置的示意图。 具体实施方式
下面结合附图对本发明作进一步详细描述。
本发明首先提供了一种在移动通信系统的一个网络设备中用于发 送重传指令的方法。 网络设备可以是基站、 无线网络控制器 (RNC ) 等, 即可以提供控制功能的设备。
图 1 为根据本发明的一种在移动通信系统的一个网络设备中用于 发送重传指令的方法的流程示意图。
如图 1所示, 该方法包括步骤 S101 , 接收由一个移动终端采用空间 复用方式发送的多个数据单元。
该多个数据单元中的各个数据单元会使用多个独立的编码方式或者 调制方式。 该多个数据单元可以为多个数据块或多个码字。 该多个数据 单元可以分别由移动终端的多个天线发送, 每个数据单元也可以拆分成 多个部分, 分别由移动终端的多个天线发送。
该方法还包括步骤 S102, 根据所述多个数据单元中各个数据单元的 接收性能指标, 确定需要重传的数据单元, 所述需要重传的数据单元为 所述多个数据单元的部分或者全部。
由于各个数据单元的调制及编码方式可能不同, 所经历的信道特性 也不同, 所以各个数据单元的接收性能也可能不同。 网络设备可以根据 接收数据单元的校验码来确定某个数据单元是否需要重传。 当接收到的 数据单元的性能指标好于一个预定的性能指标门限时, 可以认为基站正 确接收到了该数据单元; 当接收到的数据单元的性能指标差于一个预定 的性能指标门限时, 可以认为基站没有正确接收到该数据单元。 没有被 基站正确接收到的数据单元就需要移动终端重新发送。 在某些情况下, 所有的数据单元都需要重传, 在某些情况下, 只有部分数据单元需要重 传, 在某些情况下, 不需要重传任何数据单元。
该方法还包括步骤 S103, 发送一个重传反馈指示、 一个预编码矩阵 指示以及一个秩指示给所述移动终端, 通过所述三个指示中所包含的信 息告知该移动终端仅重传所述需要重传的数据单元。
针对移动终端所发送的多个数据单元, 对于上述三种指示的每一种 指示, 基站只发送一个让该多个数据单元共享的指示信息, 即在本文开 始所介绍的 HARQ-ACK空间绑定。 重传反馈指示可以使用 1 比特的 ACK/NACK来指示所接收到的数据单元是否全部被基站正确接收或者 有任何数据单元没有被基站正确接收。 基于一个基站和移动终端均认可 的由系统预定义的码本, 预编码矩阵指示和秩指示所包含的信息用来指 示移动终端所发送的数据单元应使用的预编码矩阵。 通过把上述三个指 示所包含的信息联合在一起, 而不是只使用一个重传反馈指示, 就可以 在 HARQ-ACK空间绑定的情况下,指示移动终端仅重传没有被基站正 确接收的数据单元。
当所述需要重传的数据单元为全部所述多个数据单元时, 在步骤 S103之前还包括步骤: 将所述重传反馈指示设定为重传, 将所述预编码 矩阵指示的预编码矩阵设定为根据系统性能要求所需使用的预编码矩 阵, 以及将所述秩指示设定为所述多个数据单元的数据流的数目。
重传反馈指示可以通过发送 NACK指令来指示需要重传, 即移动终 端所发送的多个数据单元没有被基站全部正确接收。 根据系统性能要 求, 如接收信号的载干比, 现有系统吞吐率情况等, 网络设备为移动终 端选择全部发送该多个数据单元应该使用的预编码。 网络设备为移动终 端选择的预编码可以和移动终端上一次发送数据使用的预编码相同或 不同。 数据流可以通过多种方式来定义, 如在 LTE-advanced系统中, 数 据流即为层。 多个数据单元的数据流的数目是指多个数据单元所包含的 所有数据流的数目, 而不是仅指一个数据单元。 数据单元的数据流的数 目可以由移动终端或网络设备根据预定义的准则来确定。 由于全部数据 单元都需要重传, 所以此时对所述三个指示的配置无需区分是针对具体 哪些或哪一个数据单元, 而是将多个数据单元作为一个整体, 根据系统 要求的性能进行配置。
当所述需要重传的数据单元为所述多个数据单元的一部分时, 步骤
S103之前还包括步骤: 将所述重传反馈指示为重传, 将所述预编码矩阵 指示的预编码矩阵设定为具有选择特性的预编码矩阵, 该矩阵的列数为 该需要重传的数据单元的数据流的数目, 以及将所述秩指示设定为该需 要重传的数据单元的数据流的数目。
重传反馈指示可以通过发送 NACK指令来指示需要重传, 即移动终 端所发送的多个数据单元没有被基站全部正确接收。 具有选择特性的预 编码矩阵是指该预编码矩阵中的数值均为 0或 1。 由于预编码矩阵中的 数值均为 0或 1 , 所以该预编码矩阵除了可以用于告知移动终端应该使 用的预编码矩阵外, 还可以用 0和 1来表示移动终端应该重传哪些或哪 一个数据单元。 比如, 1 表示需要重发, 0表示不需要重发。 移动通信 网络设备会预先定义或者动态设置多个数据单元所使用的发射天线以 及多个数据单元的层移位模式 (layer shifting pattern ) 。 根据多个数 据单元所使用的发射天线或者多个数据单元的层移位模式,基站选择 一个具有选择特性的预编码矩阵, 以告知移动终端需要重传的是多个 数据单元中的哪些或者哪一个数据单元。 需要重传的数据单元的数据 流的数目是指所有需要重传的数据单元所包含的所有数据流的数目, 而 不是仅指一个数据单元。 数据单元的数据流的数目可以由移动终端或网 络设备根据预定义的准则来确定。 当有部分数据单元被基站正确接收, 有部分数据单元没有被基站正确接收时, 如果基站所发送的重传反馈为 重传, 而秩指示所指示的秩小于移动终端所发送的多个数据单元所使用 的秩, 则可以告知移动终端其所发送的数据单元没有被基站正确接收。 基站可以进一步通过仅有 0和 1两种数值的预编码矩阵来告知移动终端 具体是哪些或哪个数据单元需要重传。
对应于上述在移动通信系统的一个网络设备中用于发送重传指令的 方法, 本发明还提供了一种在移动通信系统的一个移动终端中用于重传 数据的方法。
图 2 为^ f艮据本发明的一种在移动通信系统的一个移动终端中用于 重传数据的方法的流程示意图。
如图 2所示, 该方法包括步骤 S201 , 接收由一个网络设备发送的 一个重传反馈指示、 一个预编码矩阵指示以及一个秩指示, 所述三个指 示由该网络设备根据接收到的所述移动终端采用空间复用方式发送的 多个数据单元而设定。
移动终端在采用空间复用方式发送的多个数据单元后, 需要根据基 站的反馈来确定下一步的操作, 即重传还是发送新的数据。
该方法还包括步骤 S202, 根据所述三个指示所包含的信息, 确定需 要重传的数据单元, 所述需要重传的数据单元为所述多个数据单元的部 分或者全部。
现有的技术方案中, 移动终端只需要根据一个重传反馈指示来判断 是否需要重传数据。 根据本发明所提供的方案, 移动终端需要根据所述 三个指示所包含的信息, 确定重传方案, 即只重传没有被基站正确接收 的数据单元, 而不是简单的只要有数据单元没有被基站正确接收, 就重 传所有的数据单元。
当所述重传反馈指示为重传以及所述秩指示为所述多个数据单元 的数据流的数目时, 在步骤 S202之后还包括步骤: 发送全部所述多个 数据单元。
由于移动终端接收到了重传指示, 并且秩指示的内容和移动终端上 次发送的数据所对应的秩指示的内容相同, 则移动终端能够确定上次发 送的多个数据单元全部没有被基站正确接收, 需要全部重新发送。
当所述重传反馈指示为重传, 所述预编码矩阵指示的预编码矩阵为 具有选择特性的矩阵, 以及所述秩指示的数目小于所述多个数据单元的 数据流的数目时: 步骤 S202还包括子步骤, 根据所述预编码矩阵指示 的预编码矩阵确定所述需要重传的数据单元; 在步骤 S202之后还包括 步骤, 发送所述需要重传的数据单元。
由于移动终端接收到了重传指示, 并且秩指示的内容小于移动终端 上次发送的数据所对应的秩指示的内容, 则移动终端能够确定上次发送 的多个数据单元有部分被基站正确接收, 有部分没有被基站重传, 需要 重传部分数据单元。 在多个数据单元所使用的发射天线或者多个数据 单元的层移位模式基础之上, 移动终端根据具有选择特性的预编码矩 阵来确定具体需要重传哪些或者哪个数据单元, 比如, 矩阵中 1对应于 需要重传, 0对应于不需要重传。
当所述重传反馈指示为重传, 所述预编码矩阵指示的预编码矩阵为 不具有选择特性的矩阵, 以及所述秩指示的数目小于所述多个数据单元 的数据流的数目时, 所述需要重传的数据单元的数目为零。
由于移动终端接收到了重传指示, 并且秩指示的内容小于移动终端 上次发送的数据所对应的秩指示的内容, 移动终端本应根据预编码矩阵 指示和秩指示还会读到一个具有选择特性预编码矩阵的指示, 但是移动 终端却根据指示, 从码本中读到了一个不具有选择特性的预编码矩阵。 在这种情况下, 移动终端能够确定是重传反馈指示的传输发生了错误, 正确的重传反馈指示应该是不需要重传, 所以移动终端不重传已发送的 数据, 而是等待新的指示以进行下一步其他操作。
当只有一个数据单元需要重传, 并且该数据单元在重传后, 仍需重 传时, 由于此时不存在 HARQ-ACK 空间绑定的问题, 重传控制方式 就采用已有的重传控制方式, 即根据系统性能需求进行预编码矩阵的 选择。
下面以 LTE-Adavanced 系统中的一个移动终端为例做更具体的说 明。
在 LTE-Adavanced系统中, 一个移动终端能够使用两个发射天线发 送数据, 每个移动终端在每个上行的组成载频的一个子帧中, 最多可 以使用两个数据单元, 如数据块。 基站通过 1比特的 ACK/NACK指 令给移动终端发送重传反馈, 通过预编码矩阵指示 (PMI ) 和秩指示 ( RI )告知移动终端所需使用的预编码矩阵。根据本发明的技术方案, 基站通过 ACK/NACK、 PMI以及 RI三个指示所包含的组合信息告知 移动终端需要具体重传哪一个数据单元。
表 1为 LTE-Adavanced系统中两个发射天线的码本表。 层数即两个 数据单元所包含的总共的数据流的数目。 当层数为 1时, 共有 6种可以 使用的预编码矩阵; 当层数为 2时, 只有一种可以使用的预编码矩阵。 表 1 LTE-Adavanced系统中移动终端有两个发射天线的码本表
Figure imgf000011_0001
一个有两个发射天线的移动终端采用空间复用的方式发送了两 个数据块。 基站接收这两个数据块。
当两个数据块都正确被基站接收时, 基站就发送一个 1 比特的 ACK信息给移动终端。 移动终端收到 ACK后, 确定基站已经 4巴两个 数据块都正确接收, 就等待新的指令。
当两个数据块都没有被基站正确接收时,基站就发送一个 1比特 的 NACK信息给移动终端, 以及用 PMI和 RI来告知移动终端码本索 引为 0, 层数为 2。 移动终端在收到 NACK后, 确定至少有一个数据 单元没有被基站正确接收, 然后再通过 RI确定层数为 2,也就是需要 发送的数据流的数目和上次发送的数据流的数目相同。 因此, 移动终 端能够确定需要将两个数据单元全部重传, 并将两个数据单元重新发 送给基站。
当两个数据块中有一个被基站正确接收, 有一个没有被基站正确 接收时, 基站就发送一个 1 比特的 NACK信息给移动终端, 并根据 具体是哪个数据块需要重传, 用 PMI和 RI来告知移动终端码本索引 和层数。根据两个数据块所使用的发射天线以及两个数据块的层移位 模式, 基站选择一个具有选择特性的预编码矩阵, 以告知移动终端需 要重传的是两个数据块中的哪一个数据块。表 1中具有选择特性的预 编码矩阵为码本索引为 4和 5, 层数为 1的预编码矩阵。 当两个数据 单元分别由天线 1和天线 2发射时, 如果需要重传的数据块是由天线
1发射的, 基站就选择码本索引为 4和层数为 1的预编码矩阵
Figure imgf000012_0001
1 表示需要重传, 0表示不需要重传; 如果需要重传的数据块是由天 线 2发射的, 基站就选择码本索引为 5和层数为 1的预编码矩阵 用 1表示需要重传, 0表示不需要重传。
移动终端在收到 NACK后, 确定至少有一个数据单元没有被基 站正确接收, 然后再通过 RI确定层数为 1 ,也就是需要发送的数据流 的数目小于上次发送的数据流的数目。 因此, 移动终端能够确定只需 要重传一个数据单元即可。 移动终端才艮据 PMI和 RI读取码本中的预 编码矩阵。 当两个数据单元分别由天线 1和天线 2发射时, 如果移动 终端读取到的是预编码矩阵 ,就能够确定需要重传的是上次在天线
1发射的数据单元, 移动终端就将由天线 1发射的数据单元重新由天 线 1发送给基站,如果移动终端读取到的是预编码矩阵
Figure imgf000012_0002
定需要重传的是上次在天线 2发射的数据单元, 移动终端就将由天线 2发射的数据单元重新由天线 2发送给基站。
当由一个天线重新发送的数据单元被基站正确接收时,基站就发 送一个 ACK信息给移动终端, 移动终端收到 ACK信息后, 确定重发 的数据单元已经被基站正确接收, 就等待新的操作指令。
当由一个天线重新发送的数据单元没有被基站正确接收时, 数据 重传的控制方式和没有 HARQ-ACK空间绑定的情况相同。 基站就发 送一个 NACK信息给移动终端, 并根据系统性能的要求, 如系统容 量、 载干比等, 从表 1中层数为 1 , 编码索引 0至 5中的 6个预编码 矩阵中 , 为移动终端确定相应的预编码矩阵。
当移动终端采用空间复用的方式发送两个数据单元后, 收到了基 站发送的 NACK信息, RI指示的层数为 1 , 但是根据 PMI和 RI却从 码本中读到了一个不具有选择特性的矩阵, 如 。 移动终端能够 确定 ACK/NACK指令传输发生了差错, NACK信息实际上是 ACK 信息。 因此移动终端不做任何操作, 等待新的指令。
对应于上述两种方法, 本发明还提供了两种重传控制的装置。 图 3为根据本发明的一种在移动通信系统的一个网络设备中用于 发送重传指令的重传指令发送装置 300的示意图。
如图 3所示, 该重传指令发送装置 300包括: 一个第一接收装置 301 , 其用于接收由一个移动终端采用空间复用方式发送的多个数据 单元; 一个第一重传确定装置 302, 其用于根据所述多个数据单元中 各个数据单元的接收性能指标, 确定需要重传的数据单元, 所述需要 重传的数据单元为所述多个数据单元的部分或者全部; 以及一个第一 发送装置 303 , 其用于发送一个重传反馈指示、 一个预编码矩阵指示 以及一个秩指示给所述移动终端, 通过所述三个指示所包含的信息告 知该移动终端仅重传所述需要重传的数据单元。 对于 LTE-advanced 系统, 所述多个数据单元的数目为两个, 所述重传反馈指示所使用的 资源为 1比特。
当所述需要重传的数据单元为全部所述多个数据单元时, 该重传 指令发送装置 300还包括: 一个第一指示设定装置, 其用于将所述重 传反馈指示设定为重传, 将所述预编码矩阵指示的预编码矩阵设定为 根据系统性能要求所需使用的预编码矩阵, 以及将所述秩指示设定为 所述多个数据单元的数据流的数目。 当所述需要重传的数据单元为所述多个数据单元的一部分时, 该 重传指令发送装置 300还包括: 一个第二指示设定装置, 其用于将所 述重传反馈指示为重传, 将所述预编码矩阵指示的预编码矩阵设定为 具有选择特性的矩阵, 该矩阵的列数为该需要重传的数据单元的数据 流的数目, 以及将所述秩指示设定为该需要重传的数据单元的数据流 的数目。 当所述多个数据单元的数目为两个以及所述移动终端的发射 天线数目为两个时, 所述预编码矩阵指示的预编码矩阵为
Figure imgf000014_0001
图 4为根据本发明的一种在移动通信系统的一个移动终端中用于 重传数据的数据重传装置 400的示意图。
如图 4所示, 该数据重传装置 400包括: 一个第二接收装置 401 , 其用于接收由一个网络设备发送的一个重传反馈指示、 一个预编码矩 阵指示以及一个秩指示, 所述三个指示由该网络设备根据接收到的所 述移动终端采用空间复用方式发送的多个数据单元而设定; 以及一个 第二重传确定装置 402, 其用于根据所述三个指示所包含的信息, 确 定需要重传的数据单元, 所述需要重传的数据单元为所述多个数据单 元的部分或者全部。 对于 LTE-advanced 系统, 所述多个数据单元的 数目为两个, 所述重传反馈指示所使用的资源为 1比特。
当所述重传反馈指示为重传以及所述秩指示为所述多个数据单 元的数据流的数目时, 该数据重传装置 400还包括: 一个第二发送装 置, 其用于发送全部所述多个数据单元。
当所述重传反馈指示为重传, 所述预编码矩阵指示的预编码矩阵 为具有选择特性的矩阵, 以及所述秩指示的数目小于所述多个数据单 元的数据流的数目时, 所述第二重传装置 402还用于根据所述预编码 矩阵指示的预编码矩阵确定所述需要重传的数据单元; 该数据重传装 置 400还包括一个第三发送装置, 其用于发送所述需要重传的数据单 元。 当所述多个数据单元的数目为两个, 所述移动终端的发射天线数 目为两个, 以及所述预编码矩阵指示的预编码矩阵为 或「^时, 所
[oj L1」 述需要重传的数据单元为所述两个数据单元中的一个数据单元。 当所述重传反馈指示为重传, 所述预编码矩阵指示的预编码矩阵 为不具有选择特性的矩阵, 以及所述秩指示的数目小于所述多个数据 单元的数据流的数目时, 所述需要重传的数据单元的数目为零。
对于本领域技术人员而言, 显然本发明不限于上述示范性实施例 的细节, 而且在不背离本发明的精神或基本特征的情况下, 能够以其 他的具体形式实现本发明。 因此, 无论从哪一点来看, 均应将实施例 看作是示范性的, 而且是非限制性的, 本发明的范围由所附权利要求 而不是上述说明限定, 因此旨在将落在权利要求的等同要件的含义和 范围内的所有变化嚢括在本发明内。 不应将权利要求中的任何附图标 记视为限制所涉及的权利要求。 此外, 显然 "包括" 一词不排除其他 单元或步骤, 单数不排除复数。 系统权利要求中陈述的多个单元或装 置也可以由一个单元或装置通过软件或者硬件来实现。 第一, 第二等 词语用来表示名称, 而并不表示任何特定的顺序。

Claims

权 利 要 求 书
1. 一种在移动通信系统的一个网络设备中用于发送重传指令的方 法, 该方法包括以下步骤:
A.接收由一个移动终端采用空间复用方式发送的多个数据单元;
B.根据所述多个数据单元中各个数据单元的接收性能指标, 确定 需要重传的数据单元, 所述需要重传的数据单元为所述多个数据单元的 部分或者全部; 以及
C.发送一个重传反馈指示、 一个预编码矩阵指示以及一个秩指示 给所述移动终端, 通过所述三个指示中所包含的信息告知该移动终端仅 重传所述需要重传的数据单元。
2.根据权利要求 1 所述的方法, 其特征在于, 当所述需要重传的 数据单元为全部所述多个数据单元时, 所述步骤 C之前还包括步骤:
- 将所述重传反馈指示设定为重传, 将所述预编码矩阵指示的预 编码矩阵设定为根据系统性能要求所需使用的预编码矩阵, 以及将所述 秩指示设定为所述多个数据单元的数据流的数目。
3.根据权利要求 1 所述的方法, 其特征在于, 当所述需要重传的 数据单元为所述多个数据单元的一部分时,所述步骤 C之前还包括步骤:
- 将所述重传反馈指示为重传, 将所述预编码矩阵指示的预编码 矩阵设定为具有选择特性的预编码矩阵, 该矩阵的列数为该需要重传的 数据单元的数据流的数目, 以及将所述秩指示设定为该需要重传的数据 单元的数据流的数目。
4.根据权利要求 3所述的方法, 其特征在于, 当所述多个数据单 元的数目为两个以及所述移动终端的发射天线数目为两个时, 所述预编 码矩阵指示的预编码矩阵为
Figure imgf000016_0001
5.根据权利要求 1所述的方法, 其特征在于, 所述多个数据单元的 数目为两个, 所述重传反馈指示所使用的资源为 1比特。
6. 一种在移动通信系统的一个移动终端中用于重传数据的方法, 该方法包括以下步骤: a. 接收由一个网络设备发送的一个重传反馈指示、 一个预编码矩 阵指示以及一个秩指示, 所述三个指示由该网络设备根据接收到的所述 移动终端采用空间复用方式发送的多个数据单元而设定; 以及
b.根据所述三个指示所包含的信息, 确定需要重传的数据单元, 所述需要重传的数据单元为所述多个数据单元的部分或者全部。
7.根据权利要求 6所述的方法, 其特征在于, 当所述重传反馈指 示为重传以及所述秩指示为所述多个数据单元的数据流的数目时, 在所 述步骤 b之后还包括步骤:
- 发送全部所述多个数据单元。
8.根据权利要求 6所述的方法, 其特征在于, 当所述重传反馈指 示为重传, 所述预编码矩阵指示的预编码矩阵为具有选择特性的矩阵, 以及所述秩指示的数目小于所述多个数据单元的数据流的数目时, 所述 步骤 c还包括子步骤:
- 根据所述预编码矩阵指示的预编码矩阵确定所述需要重传的数 据单元;
在所述步骤 b之后还包括步骤:
- 发送所述需要重传的数据单元。
9.根据权利要求 8所述的方法, 其特征在于, 当所述多个数据单 元的数目为两个, 所述移动终端的发射天线数目为两个, 以及所述预编 码矩阵指示的预编码矩阵为 时, 所述需要重传的数据单元为所
Figure imgf000017_0001
述两个数据单元中的一个数据单元。
10. 根据权利要求 6所述的方法, 其特征在于, 当所述重传反馈指 示为重传, 所述预编码矩阵指示的预编码矩阵为不具有选择特性的矩 阵, 以及所述秩指示的数目小于所述多个数据单元的数据流的数目时, 所述需要重传的数据单元的数目为零。
11. 根据权利要求 6所述的方法, 其特征在于, 所述多个数据单元 的数目为两个, 所述重传反馈指示为 1比特。
12. 一种在移动通信系统的一个网络设备中用于发送重传指令的 重传指令发送装置, 该装置包括: 一个第一接收装置,其用于接收由一个移动终端采用空间复用方式 发送的多个数据单元;
一个第一重传确定装置,其用于根据所述多个数据单元中各个数据 单元的接收性能指标, 确定需要重传的数据单元, 所述需要重传的数据 单元为所述多个数据单元的部分或者全部; 以及
一个第一发送装置,其用于发送一个重传反馈指示、一个预编码矩 阵指示以及一个秩指示给所述移动终端, 通过所述三个指示所包含的信 息告知该移动终端仅重传所述需要重传的数据单元。
13. 根据权利要求 12所述的装置, 其特征在于, 当所述需要重传 的数据单元为全部所述多个数据单元时, 该装置还包括:
一个第一指示设定装置, 其用于将所述重传反馈指示设定为重传, 将所述预编码矩阵指示的预编码矩阵设定为根据系统性能要求所需使 用的预编码矩阵, 以及将所述秩指示设定为所述多个数据单元的数据流 的数目。
14. 根据权利要求 12所述的装置, 其特征在于, 当所述需要重传 的数据单元为所述多个数据单元的一部分时, 该装置还包括:
一个第二指示设定装置,其用于将所述重传反馈指示为重传,将所 述预编码矩阵指示的预编码矩阵设定为具有选择特性的矩阵, 该矩阵的 列数为该需要重传的数据单元的数据流的数目, 以及将所述秩指示设定 为该需要重传的数据单元的数据流的数目。
15. 根据权利要求 14所述的装置, 其特征在于, 当所述多个数据 单元的数目为两个以及所述移动终端的发射天线数目为两个时, 所述预 编码矩阵指示的预编码矩阵为
Figure imgf000018_0001
16. 根据权利要求 12所述的装置, 其特征在于, 所述多个数据单 元的数目为两个, 所述重传反馈指示所使用的资源为 1比特。
17. 一种在移动通信系统的一个移动终端中用于重传数据的数据 重传装置, 该装置包括:
一个第二接收装置,其用于接收由一个网络设备发送的一个重传反 馈指示、 一个预编码矩阵指示以及一个秩指示, 所述三个指示由该网络 设备根据接收到的所述移动终端采用空间复用方式发送的多个数据单 元而设定; 以及
一个第二重传确定装置, 其用于根据所述三个指示所包含的信息, 确定需要重传的数据单元, 所述需要重传的数据单元为所述多个数据单 元的部分或者全部。
18. 根据权利要求 17所述的装置, 其特征在于, 当所述重传反馈 指示为重传以及所述秩指示为所述多个数据单元的数据流的数目时, 该 装置还包括:
一个第二发送装置, 其用于发送全部所述多个数据单元。
19. 根据权利要求 17所述的装置, 其特征在于, 当所述重传反馈 指示为重传, 所述预编码矩阵指示的预编码矩阵为具有选择特性的矩 阵, 以及所述秩指示的数目小于所述多个数据单元的数据流的数目时, 所述第二重传装置还用于根据所述预编码矩阵指示的预编码矩阵确定 所述需要重传的数据单元;
该装置还包括一个第三发送装置,其用于发送所述需要重传的数据 单元。
20. 根据权利要求 19所述的装置, 其特征在于, 当所述多个数据 单元的数目为两个, 所述移动终端的发射天线数目为两个, 以及所述预 编码矩阵指示的预编码矩阵为 时, 所述需要重传的数据单元为
Figure imgf000019_0001
所述两个数据单元中的一个数据单元。
21. 根据权利要求 19所述的装置, 其特征在于, 当所述重传反馈 指示为重传, 所述预编码矩阵指示的预编码矩阵为不具有选择特性的矩 阵, 以及所述秩指示的数目小于所述多个数据单元的数据流的数目时, 所述需要重传的数据单元的数目为零。
22. 根据权利要求 19所述的装置, 其特征在于, 所述多个数据单 元的数目为两个并且所述移动终端的发射天线数目为两个时, 所述重传 反馈指示为 1比特。
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