WO2011006426A1 - 一种上行mimo模式下双流到单流的切换方法及装置 - Google Patents

一种上行mimo模式下双流到单流的切换方法及装置 Download PDF

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Publication number
WO2011006426A1
WO2011006426A1 PCT/CN2010/074893 CN2010074893W WO2011006426A1 WO 2011006426 A1 WO2011006426 A1 WO 2011006426A1 CN 2010074893 W CN2010074893 W CN 2010074893W WO 2011006426 A1 WO2011006426 A1 WO 2011006426A1
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Prior art keywords
stream
uplink mimo
data
command
switching
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PCT/CN2010/074893
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English (en)
French (fr)
Inventor
王宗杰
马雪利
李靖
韩重阳
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP10799424A priority Critical patent/EP2448320A4/en
Publication of WO2011006426A1 publication Critical patent/WO2011006426A1/zh
Priority to US13/350,358 priority patent/US8717926B2/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/10—Flow control between communication endpoints
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0486—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking channel rank into account
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1887—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1896—ARQ related signaling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03891—Spatial equalizers
    • H04L25/03898—Spatial equalizers codebook-based design
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03891—Spatial equalizers
    • H04L25/03949—Spatial equalizers equalizer selection or adaptation based on feedback
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management

Definitions

  • the invention relates to a dual-flow to single-flow switching method and device in the uplink MM0 mode.
  • the application is submitted to the Chinese Patent Office on July 15, 2009, and the application number is 200910151997.
  • X the invention name is "an uplink MIM0 mode dual flow to single
  • the priority of the method and apparatus for switching the flow of the Chinese patent application is incorporated herein by reference.
  • the present invention relates to the field of communications, and in particular, to a method for switching dual-stream to single-stream in an uplink MIMO mode.
  • WCDMA Wideband Code Division Multiple Access
  • the uplink of the WCDMA system is single antenna.
  • the uplink needs to adopt multi-antenna technology to carry data.
  • FIG. 1 is a schematic diagram of a principle of downlink MIMO (Multiple Input Multiple Output) in the prior art.
  • V2 User Equipment
  • W2 can be selected from the following set, for example:
  • the MIMO dual stream means that the Node B schedules two different data blocks at a time, one of which is a primary data block and the other is a secondary data block; the MIMO single flow means that the Node B schedules one data block at a time.
  • the data stream corresponding to the primary data block is the primary data stream, and the data stream corresponding to the secondary data block is the secondary data stream.
  • the Node B may schedule the downlink MIMO dual stream, and may also schedule the downlink MIMO single stream.
  • the downlink MIMO single-pair stream switching is controlled by the Node B.
  • the Node B may according to the channel quality and precoding control indication fed back by the UE.
  • the embodiment of the invention provides a method and a device for switching from dual stream to single stream in uplink MIMO mode, which implements switching of uplink MIMO from dual stream to single stream.
  • the embodiment of the present invention provides a method for switching a dual-flow to a single-flow in an uplink MIMO mode, where the method includes: sending a scheduling command with an absolute authorization value of zero authority to the secondary data stream; after the scheduling command takes effect After a preset time, a handover command is sent to switch the terminal from the uplink MIMO dual stream to the uplink MIMO single stream.
  • the embodiment of the present invention provides a base station, where the base station includes: a scheduling command sending unit, configured to send a scheduling command with an absolute authorization value of zero authorization to the secondary data stream; and a switching command sending unit, configured to After a preset time after the scheduling command takes effect, a handover command for switching the terminal from the uplink MIMO dual stream to the uplink MIMO single stream is sent.
  • a scheduling command sending unit configured to send a scheduling command with an absolute authorization value of zero authorization to the secondary data stream
  • a switching command sending unit configured to After a preset time after the scheduling command takes effect, a handover command for switching the terminal from the uplink MIMO dual stream to the uplink MIMO single stream is sent.
  • the embodiment of the present invention provides a dual-to-single-flow switching method in an uplink MIMO mode, where the method includes: receiving a handover command from an uplink MIMO dual-stream handover to an uplink MIMO single-stream; Before the switching command takes effect, the command stops sending new data on the secondary data stream, and retransmits only the data to be retransmitted on the secondary data stream; when the switching command takes effect, switching from the uplink MIMO dual stream to the uplink MIMO Single stream.
  • the embodiment of the present invention provides a communication terminal, where the communication terminal includes: a receiving unit, configured to receive a handover command from an uplink MIMO dual stream handover to an uplink MIMO single stream; and a response unit, configured to receive the Stopping the transmission of the new data on the secondary data stream and retransmitting the data to be retransmitted on the secondary data stream before the switching command takes effect; the switching unit is configured to: when the switching command takes effect, The uplink MIMO dual stream switches to the uplink MIMO single stream.
  • the dual-flow to single-flow switching method in the uplink MIMO mode in the embodiment of the present invention first sends a scheduling command to control the communication terminal to stop transmitting new data on the secondary data stream, but only retransmits the data, and sends the data after a period of time.
  • the handover command so that when the communication terminal switches from the uplink MIMO dual stream to the uplink MIMO single stream, there is no or only less retransmission data on the auxiliary data stream, which is advantageous for reducing data loss and simplifying HARQ (Hybrid Automatic Retransmission reQuest) , mixed from cloud retransmission request) design.
  • HARQ Hybrid Automatic Retransmission reQuest
  • the base station of the embodiment of the present invention forcibly controls the communication terminal to stop transmitting the new data on the auxiliary data stream by transmitting the scheduling instruction, and only allows the data to be retransmitted on the auxiliary data stream, and sends the handover after a period of time. Therefore, the base station in the embodiment of the present invention can control the handover timing, so that when the handover occurs, there is no or only less retransmission data on the secondary data stream, which reduces data loss and simplifies the HARQ design.
  • Another method for switching from dual stream to single stream in the uplink MIMO mode since receiving After the switching command is executed, the new data is sent on the secondary data stream before the switching command takes effect, and only the data is retransmitted, so that when the switching command takes effect, there is no or only less retransmission data on the secondary data stream, which is beneficial to Reduce data loss and simplify HARQ design.
  • the communication terminal of the embodiment of the present invention After receiving the handover command sent by the base station, the communication terminal of the embodiment of the present invention actively stops transmitting new data on the auxiliary data stream before the effective period of the command, but only retransmits the data, so that when the handover takes effect, the secondary data There is no or only less retransmission of data on the stream, which helps to reduce data loss and simplify HARQ design.
  • 1 is a schematic diagram of the principle of downlink MIMO in the prior art
  • FIG. 2 is a flow chart of a method for switching from dual stream to single stream in an uplink MIMO mode according to an embodiment of the present invention
  • FIG. 3 is a functional block diagram of a base station according to an embodiment of the present invention.
  • FIG. 4 is a flow chart of another method for switching from dual stream to single stream in an uplink MIMO mode according to an embodiment of the present invention
  • FIG. 5 is a functional block diagram of a communication terminal according to an embodiment of the present invention. detailed description
  • the embodiment of the present invention refers to the architecture of the downlink MIMO of the prior art to construct an architecture of the uplink MIMO technology, and the schematic diagram of the uplink MIMO is similar to that of FIG.
  • the uplink MIMO single- and dual-stream switching needs to be considered. For example, in a scenario where the amount of data to be transmitted by the UE is small or the UE power is limited, the UE needs to use MIMO single stream for data transmission, and the amount of data to be transmitted. In a relatively large case, the UE needs to use MIMO dual stream for data transmission.
  • the switching of the uplink MIMO single-pair stream in the embodiment of the present invention is also performed under the control of the Node B.
  • the UE may have more data to be retransmitted on the secondary data stream.
  • the HARQ Hybrid Automatic Retransmission reQuest
  • the HARQ design although simple to implement, can cause packet loss. Therefore, in order to simplify the HARQ design and reduce data loss, it is necessary to design a scheme of dual-stream switching to MIMO single-stream in the uplink MIMO mode.
  • Embodiment of the present invention A dual-flow to single-flow switching method and device in uplink MIM0 mode is proposed to solve the above problems in single-to-two-stream switching in uplink MIO mode.
  • the embodiment of the invention provides a method for switching from dual stream to single stream in uplink MIMO mode, and the purpose of reducing data loss and reducing HARQ design is achieved by reasonably selecting a switching opportunity.
  • the switching method includes the following steps:
  • Step S201 Send, to the auxiliary data stream, a scheduling command whose absolute authorized value is zero authorized;
  • the Absolute Grant (AG) information is scheduling information sent by the base station Node B to the UE, and the scheduling information indicates how much power the UE can transmit new data.
  • the values of different AGs correspond to different E-TFC selections, that is, How large a block of data is sent.
  • the value of the AG information sent by the Node B to the secondary data stream of the UE is zero authorized Zer 0 _Gr an t.
  • the UE stops to send new data on the secondary data stream, and only retransmits the data to be retransmitted on the secondary data stream.
  • Step S202 After a preset time after the scheduling command takes effect, send a handover command that causes the UE to switch from the uplink MIMO dual stream to the uplink MIMO single stream.
  • the preset time N can be set by the network side according to different policies. For example, if only a portion of the data is retransmitted once, then 0 N ⁇ 9 slots; if all data has at least one retransmission opportunity, N 9 slots.
  • the handover command from the uplink MIMO dual stream to the uplink MIMO single stream may be a downlink high speed shared control channel (HS-SCCH, Shared Control Channel for HS-DSCH) command.
  • HS-SCCH Downlink High speed shared control channel
  • the value of the command 0 or 1 can be used to switch from dual stream to single stream or single stream to dual stream, that is, when the UE receives the handover command with the value of 0, it switches from uplink MIMO dual stream to uplink MIMO.
  • step S202 may further include step S203.
  • Step S203 When switching from the uplink MIMO dual stream to the uplink MIMO single stream, if there is still data to be retransmitted on the secondary data stream, the data is discarded.
  • the scheduling command is first sent to control the UE to stop transmitting the new data on the secondary data stream, but only retransmit the data, and for a period of time. Then, the handover command is sent, so that when the UE switches from the uplink MIMO dual stream to the uplink MIMO single stream, there is no or only less retransmission data on the auxiliary data stream, which is beneficial to reduce data loss and simplify HARQ (Hybrid Automatic). Retransmission reQuest, hybrid automatic repeat request) design.
  • HARQ Hybrid Automatic
  • the embodiment of the present invention further provides a base station, where the base station sends a scheduling command before sending a handover command of the uplink MIMO from the dual stream to the single stream, so that the UE stops sending new data on the auxiliary data stream, but only in the auxiliary data stream.
  • the data is retransmitted to make the timing of the handover more reasonable, that is, to reduce data loss during handover.
  • FIG. 3 is a functional block diagram of a base station according to an embodiment of the present invention.
  • a base station provided by an embodiment of the present invention includes:
  • the scheduling command sending unit 301 is configured to send, to the secondary data stream, an absolutely authorized scheduling command with a value of zero authorization.
  • the value of the AG information sent by the Node B to the UE is zero authorized Zer 0 _Gr an t.
  • the UE stops to send new data on the secondary data stream, and only retransmits the data to be retransmitted on the secondary data stream.
  • the handover command sending unit 302 is configured to send a handover command for the UE to switch from the uplink MIMO dual stream to the uplink MIMO single stream after a preset time after the scheduling command takes effect.
  • the preset time N can be set by the network side according to different policies. For example, if only a partial data is retransmitted once, the binjjO N ⁇ 9 time slot; if all data has at least one retransmission opportunity, N 9 time slots.
  • the handover command from the uplink MIMO dual stream to the uplink MIMO single stream may be a downlink high speed shared control channel (HS-SCCH, Shared Control Channel for HS-DSCH) command.
  • HS-SCCH Downlink High speed shared control channel
  • the UE switches from the uplink MIMO dual stream to the uplink MIMO single stream according to the handover command.
  • the data will be discarded.
  • the UE is stopped in the auxiliary number by sending a scheduling command.
  • the new data is sent on the flow, and only the data to be retransmitted is retransmitted on the secondary data stream, and the handover command is sent after a period of time. Therefore, the base station in the embodiment of the present invention can control the handover timing so that the handover occurs. At the time, there is no or only less retransmission of data on the secondary stream, which reduces data loss and simplifies the HARQ design.
  • the embodiment of the invention further provides another method for switching from dual stream to single stream in the uplink MIMO mode.
  • the UE stops transmitting new data on the secondary data stream and only retransmits the data, so that the uplink MIMO dual stream to the uplink MIMO single stream can be stopped before the received uplink MIMO dual single stream switching command takes effect. Switching occurs when there is no or only less retransmission of data on the secondary stream.
  • FIG. 4 is a flow chart of a method for switching from dual stream to single stream in an uplink MIMO mode according to an embodiment of the present invention. As shown in FIG. 4, the switching method includes the following steps:
  • Step S401 Receive a handover command from an uplink MIMO dual stream handover to an uplink MIMO single stream.
  • the handover command from the uplink MIMO dual stream to the uplink MIMO single stream may be a downlink high speed shared control channel (HS-SCCH, Shared Control Channel for HS-DSCH) command.
  • HS-SCCH Downlink High speed shared control channel
  • Step S402 Before the switching command takes effect, stop sending new data on the secondary data stream, and retransmit the data to be retransmitted on the secondary data stream.
  • the effective time of the handover command may be 12 time slots after the base station sends the HS-SCCH command.
  • Step S403 When the handover command takes effect, switch from the uplink MIMO dual stream to the uplink MIMO single stream.
  • the method may further include step S404;
  • Step S404 When the handover command takes effect, that is, when switching from the uplink MIMO dual stream to the uplink MIMO stream, if there is still data to be retransmitted on the auxiliary data stream, the data is discarded.
  • the method for switching the dual-flow to the single-stream in the uplink MIMO mode provided by the embodiment shown in FIG. 4, after receiving the handover command, stopping to send new data on the secondary data stream before the handover command takes effect, but only performing retransmission Data, so that when the handover command is in effect, there is no or only less retransmission of data on the secondary data stream, which helps to reduce data loss and simplify HARQ design.
  • the embodiment of the present invention further provides a communication terminal, such as a UE, after receiving the MIMO dual-stream to single-flow switching instruction sent by the base station, stopping the sending of new data on the auxiliary data stream before the command takes effect. Only the data is retransmitted, so that when switching from the uplink MIMO dual stream to the uplink MIMO single stream, there is no or only less retransmission data on the secondary stream.
  • a communication terminal such as a UE
  • FIG. 5 is a functional block diagram of a communication terminal according to an embodiment of the present invention. As shown in FIG. 5, a communication terminal 500 includes:
  • the receiving unit 501 is configured to receive a handover command that is switched from an uplink MIMO dual stream to an uplink MIMO single stream.
  • the handover command from the uplink MIMO dual stream to the uplink MIMO single stream may be a downlink high speed shared control channel (HS-SCCH, Shared Control Channel for HS-DSCH) command.
  • HS-SCCH Downlink High speed shared control channel
  • the response unit 502 is configured to stop transmitting new data on the secondary data stream and retransmit the data to be retransmitted on the secondary data stream before the switching command takes effect.
  • the effective time of the handover command may be 12 time slots after the base station sends the HS-SCCH command.
  • the switching unit 503 is configured to switch from the uplink MIMO dual stream to the uplink MIMO single stream when the switching command takes effect.
  • the handover command takes effect, if there is still data to be retransmitted on the secondary data stream, the data is discarded.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

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Description

一种上行 MM0模式下双流到单流的切换方法及装置 本申请要求于 2009年 7月 15日提交中国专利局、 申请号为 200910151997. X、发明 名称为 "一种上行 MIM0模式下双流到单流的切换方法及装置" 的中国专利申请的优先 权， 其全部内容通过引用结合在本申请中。 技术领域
本发明涉及通信领域， 具体地涉及一种上行 MIMO模式下双流到单流的切换方法及
背景技术
随着通信技术的飞速发展，宽带码分多址（Wideband Code Division Multiple Access, WCDMA)作为第三代移动通信系统的主流技术之一， 在全球范围内得到了广泛的研究 和应用。 目前 WCDMA系统上行都是单天线的， 为了进一步提高 WCDMA系统的上行 传输速率， 减小数据传输时延， 上行需要采用多天线技术来承载数据。
图 1为现有技术的下行 MIMO (Multiple Input Multiple Output, 多输入多输出） 的 原理示意图。 如图 1所示， Wl， W2, W3 , W4称为数据块 （Block)的权重因子， 其中 Wl=^ , W2是用户设备 （User Equipment, UE) 反馈给基站 （Node B ) 的预编码信 V2
息， W2的值可以从下面的集合中选取， 例如：
[1 + j 1 - 7 - 1 + j
Μ> E < ― ― ― ―
{ 2 2 2 2 J
(Wl , W2 ) 称为主预编码向量， 用来对主数据块进行加权； 而 W3=W1， W4=-W2, (W3， W4 ) 称为辅预编码向量， 用来对辅数据块进行加权。
MIMO双流指 Node B每次调度两个不同的数据块， 其中一个是主数据块， 另一个是 辅数据块； MIMO单流指 Node B每次调度一个数据块。 主数据块对应的数据流为主数据 流， 辅数据块对应的数据流为辅数据流。现有技术中， Node B可能调度下行 MIMO双流， 也可能调度下行 MIMO单流， 下行 MIMO单双流的切换由 Node B进行控制， 比如， Node B会根据 UE反馈的信道质量和预编码控制指示， 并结合自身条件决定下一时刻调度下行 MIMO双流还是调度下行 MIMO单流。 现有技术中， 由于对于上行 MIMO技术还处于研 究阶段， 目前还没有对应于上行 MIMO模式下双流切换到单流的相关方案。 发明内容
本发明实施例提供了一种上行 MIMO模式下双流到单流的切换方法及装置， 实现 上行 MIMO从双流到单流的切换。
一方面， 本发明实施例提供了一种上行 MIMO模式下双流到单流的切换方法， 所 述方法包括： 向辅数据流发送绝对授权值为零授权的调度命令； 在所述调度命令生效后 的一预设时间之后，发送使终端从上行 MIMO双流切换到上行 MIMO单流的切换命令。
另一方面， 本发明实施例提供了一种基站， 所述基站包括： 调度命令发送单元， 用 于向辅数据流发送绝对授权值为零授权的调度命令； 切换命令发送单元， 用于在所述调 度命令生效后的一预设时间之后， 发送使终端从上行 MIMO双流切换到上行 MIMO单 流的切换命令。
又一方面， 本发明实施例提供了一种上行 MIMO模式下双流到单流的切换方法， 所述方法包括： 接收从上行 MIMO双流切换到上行 MIMO单流的切换命令； 在收到所 述切换命令到所述切换命令生效之前， 停止在辅数据流上发送新数据， 仅对辅数据流上 待重传的数据进行重传；当所述切换命令生效时，从上行 MIMO双流切换到上行 MIMO 单流。
再一方面， 本发明实施例提供了一种通信终端， 所述通信终端包括： 接收单元， 用 于接收从上行 MIMO双流切换到上行 MIMO单流的切换命令； 响应单元， 用于在收到 所述切换命令到所述切换命令生效之前， 停止在辅数据流上发送新数据， 而对辅数据流 上待重传的数据进行重传； 切换单元， 用于当所述切换命令生效时， 从上行 MIMO双 流切换到上行 MIMO单流。
本发明实施例的一种上行 MIMO模式下双流到单流的切换方法由于先发送调度命 令以控制通信终端停止在辅数据流上发送新数据， 而只是重传数据， 且在一段时间之后 才发送切换命令， 这样当通信终端从上行 MIMO双流切换到上行 MIMO单流时， 辅数 据流上没有或只有较少的重传数据， 这样有利于减少数据丢失， 同时也简化了 HARQ (Hybrid Automatic Retransmission reQuest, 混合自云力重传请求） 设计。
本发明实施例的基站由于通过发送调度指令强行控制通信终端停止在辅数据流上 发送新数据， 而只允许其在辅数据流上重传待重传的数据， 并在一段时间之后才发送切 换命令， 所以本发明实施例的基站可以控制切换时机， 以使切换发生时， 辅数据流上没 有或只有较少重传数据， 减少了数据丢失， 简化了 HARQ设计。
本发明实施例的另一种上行 MIMO模式下双流到单流的切换方法， 由于在接收到 切换命令后，在该切换命令生效前停上在辅数据流上发送新数据，而只是进行重传数据， 这样当切换命令生效时， 辅数据流上没有或只有较少重传数据， 有利于减少数据丢失和 简化 HARQ设计。
本发明实施例的通信终端， 在接收到基站发送的切换命令后， 在该命令的生效期前 主动停止在辅数据流上发送新数据， 而只是重传数据， 这样当切换生效时， 辅数据流上 没有或只有较少重传数据， 有利于减少数据丢失和简化 HARQ设计。 附图说明
图 1为现有技术的下行 MIMO的原理示意图；
图 2为本发明实施例提供的一种上行 MIMO模式下双流到单流的切换方法的流程 图；
图 3为本发明实施例提供的一种基站的功能方框图；
图 4为本发明实施例提供的另一种上行 MIMO模式下双流到单流的切换方法的流 程图；
图 5为本发明实施例提供的一种通信终端的功能方框图。 具体实施方式
本发明实施例参照现有技术下行 MIMO的架构来搭建上行 MIMO技术的架构， 上 行 MIMO的原理图和图 1类似。 上行引入 MIMO技术以后， 需要考虑上行 MIMO单 双流的切换， 比如在 UE需要传输的数据量较少或 UE功率受限的场景下就需要 UE用 MIMO单流进行数据传输， 在需要传输的数据量比较大的情况下， UE就需要用 MIMO 双流进行数据传输。
参照下行 MIMO的原理，本发明实施例中上行 MIMO单双流的切换也是在 Node B 的控制之下进行的。 当 Node B下发的从双流到单流的切换命令生效时， UE的辅数据流 上可能有较多的数据需要重传。 此时， 如果不使数据丢失则要对辅数据流的重传数据进 行 HARQ (Hybrid Automatic Retransmission reQuest, 混合自动重传请求）设计， 但这将 大大增加实现的复杂度； 如果不对辅数据流进行 HARQ 设计， 虽然实现比较简单， 但 会发生丢包现象。 因此， 为了既简化 HARQ设计又减少数据丢失， 需要对上行 MIMO 模式下双流切换到 MIMO单流的方案进行设计。
如上所述， 上行 MIMO模式下， 发生双流到单流的切换时， UE无法避免在辅数据 流上有较多重传数据时， 会导致大量数据丢失或 HARQ 设计过于复杂。 本发明实施例 提出一种上行 MIM0模式下双流到单流的切换方法与装置来解决上行 MIO模式下单双 流切换时存在的上述问题。
为使本发明实施例的目的、 技术方案和优点更加清楚， 下面将结合本发明实施例中 的附图， 对本发明实施例中的技术方案进行清楚、 完整地描述， 显然， 所描述的实施例 是本发明一部分实施例， 而不是全部的实施例。 基于本发明中的实施例， 本领域普通技 术人员在没有作出创造性劳动前提下所获得的所有其他实施例， 都属于本发明保护的范 围。
本发明实施例提供了一种上行 MIMO模式下双流到单流的切换方法， 通过合理选 择切换时机以达到减少数据丢失和减化 HARQ设计的目的。
图 2为本发明实施例提供的一种上行 MIMO模式下双流到单流的切换方法的流程 图。 如图 2所示， 该切换方法包括如下步骤：
步骤 S201、 向辅数据流发送绝对授权的值为零授权的调度命令；
绝对授权（AG， Absolute Grant)信息是基站 Node B发送给 UE的调度信息， 该调 度信息表示 UE能够以多大的功率发送新数据，不同的 AG的值对应着不同的 E-TFC选 择，也即发送多大的数据块。 E-TFC表示： E-DCH传输格式组合（E-DCH Transport Format Combination) ， 其中 E-DCH表示增强专用传输信道 (Enhanced Dedicated Transport Channel) 。 如果 AG= Zero_Grant (零授权） ， 对于调度业务， UE将不能选出 E-TFC, 也就不能发送新数据； 由于重传数据不需要 E-TFC 选择， 所以当 AG= Zer0_Grant时， 不影响 UE发送重传数据。 在本实施例中， Node B向 UE的辅数据流发送的 AG信息的 值为零授权 Zer0_Grant。 UE在接收到 Node B发送的绝对授权的值为零授权的调度命令 后， 就会停上在辅数据流上发送新数据， 而只对辅数据流上待重传的数据进行重传。
步骤 S202、 在所述调度命令生效后的一预设时间之后， 发送使 UE从上行 MIMO 双流切换到上行 MIMO单流的切换命令。
其中， 所述预设时间 N可由网络侧根据不同的策略来设定。 比如， 如果只给部分数 据重传一次的机会， 则 0 N<9时隙； 如果所有数据都有至少一次的重传机会， N 9 时隙。
所述从上行 MIMO双流到上行 MIMO单流的切换命令可以为下行高速共享控制信 道 （HS-SCCH, Shared Control Channel for HS-DSCH) 命令。 比如， 可以用该命令的取 值 0或 1分别代表双流到单流的切换或者单流到双流的切换， 即： 当 UE接收切换命令 的取值为 0时， 从上行 MIMO双流切换到上行 MIMO单流。 可选地， 在具体实现中， 步骤 S202之后还可以包括步骤 S203。
步骤 S203、 当从上行 MIMO双流切换到上行 MIMO单流时， 如果辅数据流上还存 在待重传的数据， 则丢弃所述数据。
图 2所示实施例提供的上行 MIMO模式下双流到单流的切换方法中， 由于先发送 调度命令以控制 UE停上在辅数据流上发送新数据， 而只是重传数据， 且在一段时间之 后才发送切换命令， 这样当 UE从上行 MIMO双流切换到上行 MIMO单流时， 辅数据 流上没有或只有较少的重传数据， 这样有利于减少数据丢失， 同时也简化了 HARQ (Hybrid Automatic Retransmission reQuest, 混合自动重传请求) 设计。
本发明实施例还提供了一种基站， 该基站通过在发送上行 MIMO 从双流到单流的 切换命令之前先发送调度命令以使 UE停止在辅数据流上发送新数据， 而只是在辅数据 流上重传数据， 以使切换发生的时机更加合理， 即减少切换时的数据丢失。
图 3为本发明实施例提供的一种基站的功能方框图。 如图 3所示， 本发明实施例提 供的一种基站包括：
调度命令发送单元 301， 用于向辅数据流发送绝对授权的值为零授权的调度命令。 其中， 绝对授权 （AG， Absolute Grant)信息是基站 Node B发送给 UE的调度信息， 该调 度信息表示 UE能够以多大的功率发送新数据，不同的 AG的值对应着不同的 E-TFC选择， 也即发送多大的数据块。 如果 AG= Zero—Grant (零授权） ， 对于调度业务， UE将不能选 出 E-TFC, 也就不能进行发送新数据， 由于重传数据不需要 E-TFC 选择， 所以当 AG= Zero_Grant时， 不影响 UE发送重传数据。 在本实施例中， Node B向 UE发送的 AG信息的 值为零授权 Zer0_Grant。 UE在接收到 Node B发送的绝对授权的值为零授权的调度命令 后， 停上在辅数据流上发送新数据， 而只对辅数据流上待重传的数据进行重传。
切换命令发送单元 302， 用于在所述调度命令生效后的一预设时间之后， 发送使 UE 从上行 MIMO双流切换到上行 MIMO单流的切换命令。 其中， 所述预设时间 N可由网络 侧根据不同的策略来设定。 比如， 如果只给部分数据重传一次的机会， 贝 ljO N<9时隙； 如果所有数据都有至少一次的重传机会， N 9时隙。
所述从上行 MIMO双流到上行 MIMO单流的切换命令可以为下行高速共享控制信道 (HS-SCCH, Shared Control Channel for HS-DSCH) 命令。 UE根据该切换命令从上行 MIMO双流切换到上行 MIMO单流。 当从上行 MIMO双流切换到上行 MIMO单流时， 如 果辅数据流上还存在待重传的数据， 则将丢弃该数据。
根据本发明实施例中图 3所示的基站， 由于通过发送调度命令控制 UE停止在辅数 据流上发送新数据， 而只允许其在辅数据流上重传待重传的数据， 并在一段时间之后才 发送切换命令， 所以本发明实施例的基站可以控制切换时机， 以使切换发生时， 辅数据 流上没有或只有较少重传数据， 减少了数据丢失， 简化了 HARQ设计。
本发明实施例还提供了另一种上行 MIMO模式下双流到单流的切换方法。 该方法 中， UE通过在所接收到的上行 MIMO双单流切换命令生效之前， 停止在辅数据流上发 送新数据， 而仅重传数据， 从而可使从上行 MIMO双流到上行 MIMO单流的切换发生 在辅数据流上没有或只有较少重传数据的时候。
图 4为本发明实施例提供的一种上行 MIMO模式下双流到单流的切换方法的流程 图。 如图 4所示， 该切换方法包括如下步骤：
步骤 S401、 接收从上行 MIMO双流切换到上行 MIMO单流的切换命令。 其中， 所 述从上行 MIMO 双流到上行 MIMO 单流的切换命令可以为下行高速共享控制信道 (HS-SCCH, Shared Control Channel for HS-DSCH) 命令。
步骤 S402、 在所述切换命令生效之前， 停止在辅数据流上发送新数据， 而对辅数 据流上待重传的数据进行重传。 其中， 所述切换命令的生效时间可以为基站发送完 HS-SCCH命令后的 12个时隙。
步骤 S403、 当所述切换命令生效时， 从上行 MIMO双流切换到上行 MIMO单流。 可选地， 具体应用中， 该方法还可以包括步骤 S404;
步骤 S404、 当所述切换命令生效时， 即当从上行 MIMO双流切换到上行 MIMO单 流时， 如果辅数据流上还存在待重传的数据， 则将所述数据丢弃。
图 4所示实施例提供的上行 MIMO模式下双流到单流的切换方法， 由于在接收到 切换命令后，在该切换命令生效前停上在辅数据流上发送新数据，而只是进行重传数据， 这样当切换命令生效时， 辅数据流上没有或只有较少重传数据， 有利于减少数据丢失和 简化 HARQ设计。
本发明实施例还提供了一种通信终端， 比如 UE， 该通信终端在接收到基站发送的 MIMO双流至单流的切换指令后， 在该命令生效前停止在辅数据流上发送新数据， 而只 是重传数据， 从而可使从上行 MIMO双流切换到上行 MIMO单流时， 辅数据流上没有 或只有较少重传数据。
图 5为本发明实施例提供的一种通信终端的功能方框图。 如图 5所示， 一种通信终 端 500包括：
接收单元 501， 用于接收从上行 MIMO双流切换到上行 MIMO单流的切换命令。 其中， 所述从上行 MIMO双流到上行 MIMO单流的切换命令可以为下行高速共享控制 信道 （HS-SCCH, Shared Control Channel for HS-DSCH) 命令。
响应单元 502， 用于在所述切换命令生效之前， 停止在辅数据流上发送新数据， 而 对辅数据流上待重传的数据进行重传。 其中， 所述切换命令的的生效时间可以为基站发 送完 HS-SCCH命令后的 12个时隙。
切换单元 503， 用于当所述切换命令生效时， 从上行 MIMO双流切换到上行 MIMO 单流。
可选地， 在不同的应用中， 当所述切换命令生效时， 如果辅数据流上还存在待重传 的数据， 则将所述数据丢弃。
图 5所示实施例的通信终端， 在接收到基站发送的切换命令后， 在该命令的生效期 前主动停止在辅数据流上发送新数据， 而只是重传数据， 这样当切换生效时， 辅数据流 上没有或只有较少重传数据， 这样就避免了在辅数据流上有较多重传数据时发生上行 MIMO双流到上行 MIMIO单流的切换， 有利于减少数据丢失， 并且简化 HARQ设计。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程， 是可以通 过计算机程序来指令相关的硬件来完成，所述的程序可存储于一计算机可读取存储介质 中， 该程序在执行时， 可包括如上述各方法的实施例的流程。 其中， 所述的存储介质可 为磁碟、光盘、只读存储记忆体（Read-Only Memory, ROM)或随机存储记忆体（Random Access Memory, RAM) 等。
以上实施例仅用以说明本发明实施例的技术方案， 而非对其限制； 尽管参照前述实 施例对本发明实施例进行了详细的说明， 本领域的普通技术人员应当理解： 其依然可以 对前述各实施例所记载的技术方案进行修改， 或者对其中部分技术特征进行等同替换； 而这些修改或者替换， 并不使相应技术方案的本质脱离本发明各实施例技术方案的范 围。

Claims

权利 要 求
1、一种上行 MIMO模式下双流到单流的切换方法， 其特征在于， 所述 方法包括：
向辅数据流发送绝对授权值为零授权的调度命令；
在所述调度命令生效后的一预设时间之后， 发送使终端从上行 MIMO 双流切换到上行 MIMO单流的切换命令。
2、 根据权利要求 1所述的方法， 其特征在于：
当所述辅数据流中的部分数据需要重传一次时， 所述预设时间小于 9 个时隙；
当所述辅数据流中的所有数据需要重传至少一次时， 所述预设时间大 于或等于 9个时隙。
3、 根据权利要求 1所述的方法， 其特征在于：
所述使终端从上行 MIMO双流切换到上行 MIMO单流的切换命令为下 行高速共享控制信道命令。
4、 根据权利要求 1-3任意一项所述的方法， 其特征在于：
当所述终端从上行 MIMO双流切换到上行 MIMO单流且所述辅数据流 上还存在待重传的数据， 丢弃所述待重传的数据。
5、 一种基站， 其特征在于， 所述基站包括：
调度命令发送单元， 用于向辅数据流发送绝对授权值为零授权的调度 命令；
切换命令发送单元， 用于在所述调度命令生效后的一预设时间之后， 发送使终端从上行 MIMO双流切换到上行 MIMO单流的切换命令。
6、 根据权利要求 5所述的基站， 其特征在于：
当所述辅数据流中的部分数据需要重传一次时， 所述预设时间小于 9 个时隙；
当所述辅数据流中的所有数据需要重传至少一次时， 所述预设时间大 于或等于 9个时隙。
7、 根据权利要求 5所述的基站， 其特征在于：
所述使终端从上行 MIMO双流切换到上行 MIMO单流的切换命令为下 行高速共享控制信道命令。
8、一种上行 MIMO模式下双流到单流的切换方法， 其特征在于， 所述 方法包括：
接收从上行 MIMO双流切换到上行 MIMO单流的切换命令； 在收到所述切换命令到所述切换命令生效之前， 停止在辅数据流上发 送新数据， 仅对辅数据流上待重传的数据进行重传；
当所述切换命令生效时， 从上行 MIMO双流切换到上行 MIMO单流。
9、 根据权利要求 8所述的方法， 其特征在于，
所述切换命令为下行高速共享控制信道命令。
10、 根据权利要求 8或 9所述的方法， 其特征在于，
所述切换命令的生效时间为基站发送完所述切换命令后的 12个时隙。
11、 一种通信终端， 其特征在于， 所述通信终端包括：
接收单元，用于接收从上行 MIMO双流切换到上行 MIMO单流的切换 命令；
响应单元， 用于在收到所述切换命令到所述切换命令生效之前， 停止 在辅数据流上发送新数据， 而对辅数据流上待重传的数据进行重传；
切换单元， 用于当所述切换命令生效时， 从上行 MIMO双流切换到上 行 MIMO单流。
12、 根据权利要求 11所述的通信终端， 其特征在于，
所述切换命令为下行高速共享控制信道命令。
13、 根据权利要求 11或 12所述的通信终端， 其特征在于，
所述切换命令的生效时间为基站发送完所述切换命令后的 12个时隙。
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