WO2009018698A1 - Methods and systems for selecting the number of mimo data streams - Google Patents

Methods and systems for selecting the number of mimo data streams Download PDF

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Publication number
WO2009018698A1
WO2009018698A1 PCT/CN2007/003782 CN2007003782W WO2009018698A1 WO 2009018698 A1 WO2009018698 A1 WO 2009018698A1 CN 2007003782 W CN2007003782 W CN 2007003782W WO 2009018698 A1 WO2009018698 A1 WO 2009018698A1
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Prior art keywords
shared data
noise ratio
downlink shared
data channel
symbol level
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English (en)
French (fr)
Inventor
Focai Peng
Cuihong Han
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ZTE Corp
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ZTE Corp
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    • 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
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
    • 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
    • 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
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • 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
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity

Definitions

  • the present invention relates to the field of communications, and in particular, to a method and system for selecting a number of multiple input multiple output data streams.
  • MAC Media Access Control Layer
  • 3GPP Third Generation Mobile Communications Partnership Project
  • MAC-ehs Media Access Control Layer
  • LTE Long Term Evolution
  • TTI Transmission Time Interval
  • the base stations can transmit one or one UE to the UE within one TTI. Two data blocks (may be more in the future, eg, transmitting 4 data blocks simultaneously:).
  • the base station should decide which UE to schedule before transmitting one or more data blocks (of course, blind scheduling and round robin scheduling are also available).
  • the base station should first calculate the scheduling priority of the UE to schedule which UE is scheduled first (of course, it is also possible to calculate).
  • the base station Before calculating the scheduling priority of a UE, the base station should first decide to transmit one or more data blocks to the UE (of course, it is also possible to blindly select the number of data blocks and alternately select the number of data blocks;).
  • the present invention provides a method and system for selecting the number of multiple input multiple output data streams. From the simulation results, the method can greatly improve the sector throughput rate and the UE throughput rate. .
  • the method for selecting the number of multiple input multiple output data streams according to the present invention includes the following steps: S102: The base station checks the buffer status of each user equipment, and according to the channel quality indication that the terminal reports a single stream, and prefers the channel quality of the dual stream a channel quality indicator corresponding to the first stream in the indication and Corresponding to the channel quality indicator of the second stream, determining the first high speed downlink shared channel (HS-DSCH or DL-SCH; collectively referred to as "downlink shared data channel”) corresponding to the three channel quality indications, the symbol level SNR, and the second downlink A shared data channel symbol level signal to noise ratio, and a third downlink shared data channel symbol level signal to noise ratio.
  • S104 The base station checks the buffer status of each user equipment, and according to the channel quality indication that the terminal reports a single stream, and prefers the channel quality of the dual stream a channel quality indicator corresponding to the first stream in the indication and Corresponding to the channel quality indicator of the second stream, determining the first high speed downlink shared channel
  • the base station sends a single stream to the user equipment if the buffer of the user equipment is lower than the first threshold. S106.
  • a smaller SNR in the second downlink shared data channel symbol level SNR and the third downlink shared data channel symbol level SNR is greater than the first downlink shared data channel symbol level SNR.
  • a sum of a transport block size corresponding to the second downlink shared data channel symbol level SNR and a transport block size corresponding to the third downlink shared data channel symbol level SNR is greater than a first downlink shared data channel symbol level SNR
  • the base station transmits dual streams to the user equipment. Otherwise, the base station transmits a single stream to the user equipment.
  • the above S102 to S106 are repeated until all the user equipments belonging to the base station are checked.
  • the determining, by the base station, the first downlink shared data channel symbol level signal to noise ratio, the second downlink shared data channel symbol level signal to noise ratio, and the third downlink shared data channel symbol level signal to noise ratio are performed in S106.
  • the method can be applied to a wideband code division multiple access system.
  • the multiple input multiple output data stream number selection system includes: a buffer detecting device, located at the base station side, for checking a buffer state of each user equipment; a signal to noise ratio calculating device, located at the base station side, for The channel quality indicator that is reported by the terminal and tends to be single stream, the channel quality indicator corresponding to the first stream in the channel quality indicator of the dual stream, and the channel quality indicator corresponding to the second stream determine the third channel quality indicator corresponding to the first a downlink shared data channel symbol level signal to noise ratio, a second downlink shared data channel symbol level signal to noise ratio, and a third downlink shared data channel symbol level signal to noise ratio; and a data stream number selecting device for use in the user equipment If the buffer is lower than the first threshold, the single stream is selected to be transmitted to the user equipment; for one user equipment, the second downlink shared data channel symbol level signal to noise ratio and the third downlink shared data channel symbol level signal to noise ratio The smaller SNR is greater than the first downlink shared data channel symbol level SNR and the second
  • the base station transmits a single stream to the user equipment.
  • the system of the present invention can be used in Wideband Code Division Multiple Access (OFDM) systems and Long Term Evolution (LTE) systems. With the method and system for selecting the number of multiple input multiple output data streams according to the present invention, the sector throughput rate and the UE throughput rate are greatly improved.
  • OFDM Wideband Code Division Multiple Access
  • LTE Long Term Evolution
  • FIG. 1 is a flow chart of a method for selecting a number of multiple input multiple output data streams according to the present invention
  • FIG. 2 is a block diagram of a multiple input multiple output data number selection system in accordance with the present invention
  • FIG. 4 is a cumulative distribution function of the sector throughput rate under different stream selection algorithms
  • FIG. 5 is a cumulative distribution function of UE throughput rates under different stream selection algorithms.
  • the base station checks a buffer status of each user equipment, and according to a channel quality indicator that is sent by the terminal, which is inclined to be a single stream, and a channel quality indicator corresponding to the first stream in the dual-channel channel quality indication, and corresponding to the second
  • the channel quality indicator of the stream determines a first downlink shared data channel symbol level SNR corresponding to the three channel quality indicators, a second downlink shared data channel symbol level SNR, and a third downlink shared data channel symbol level SNR. ratio.
  • the base station transmits a single stream to the user equipment if the buffer of the user equipment is lower than the first value.
  • the above S102 to S106 are repeated until all the user equipments belonging to the base station downlink shared data channel cell are checked.
  • the determining, by the base station, the first downlink shared data channel symbol level signal to noise ratio, the second downlink shared data channel symbol level signal to noise ratio, and the third downlink shared data channel symbol level signal to noise ratio are performed in S106.
  • the method of the present invention can be applied to a wideband code division multiple access system.
  • 2 is a block diagram of a multiple input multiple output data number selection system in accordance with the present invention. As shown in FIG.
  • the system includes: a buffer detecting device 202, located at the base station side, for checking a buffer status of each user equipment; and a signal-to-noise ratio calculating device 204, located at the base station side, for reporting according to the terminal a channel quality indicator that favors a single stream, a channel quality indicator corresponding to the first stream in the channel quality indication that is preferred to the dual stream, and a channel quality indicator corresponding to the second stream determines a first downlink corresponding to the three channel quality indicators a shared data channel symbol level signal to noise ratio, a second downlink shared data channel symbol level signal to noise ratio, and a third downlink shared data channel symbol level signal to noise ratio; and a data stream number selection device 206 for buffering at the user equipment If the area is lower than the first threshold, the single stream is selected to be transmitted to the user equipment; for one user equipment, the second downlink shared data channel symbol level signal to noise ratio and the third downlink shared data channel symbol level signal to noise ratio are compared.
  • the small signal to noise ratio is greater than the first downlink shared data channel symbol level signal to noise ratio and the second downlink shared data channel symbol level signal to noise ratio corresponding to the transport block is large
  • a third case where a downlink shared data channel corresponding to the symbol level SNR transport block sizes larger than the first downlink shared data channel symbol SNR level corresponding to the transport block size of the selected double transmitted to the user equipment. Otherwise, the base station transmits a single stream to the user equipment.
  • the MIMO solution based on the 3GPP Release 7 version is dual-stream transmit diversity (D-TxAA) (the future 3GPP Release 8/9/10 release will inherit and develop the D-TxAA solution;).
  • the channel status report of the terminal itself tends to be a single stream channel quality indicator (CQI S ) (between 0 and 30) and a dual stream CQI D (between 31 and 255).
  • CQI S channel quality indicator
  • D dual stream CQI D
  • the base station splits the CQI D into CQI corresponding to the first stream, (between 0-14) and CQI 2 corresponding to the second stream (between 0-14;) .
  • the present invention proposes a method for determining the number of transmitted MIMO data streams. As shown in Figure 1.
  • Base station (Node B or eNode) if not specified otherwise B), Radio Network Controller (RNC), Enhanced Base Station (Node B+ or eNode B) incorporating RNC, UE supports D-TxAA mode MIMO.
  • the base station here may be a Node B without RNC function, or may be a Node B+ or eNode B with RNC function.
  • 3 is a flow chart of a method for selecting a number of multiple input multiple output data streams in accordance with an embodiment of the present invention. As shown in FIG. 3, the method includes the following steps:
  • the base station checks the buffers of each UE one by one until all UEs check.
  • the base station calculates, according to the CQI S , the CQI, and the CQI 2 , a symbol-level signal-to-noise ratio (SNR) of the downlink shared data channel corresponding to the three CQIs: (a first downlink shared data channel symbol level SNR), L (second downlink shared data channel symbol level signal to noise ratio) and ⁇ ! (third downlink shared data channel symbol level signal to noise ratio).
  • SNR symbol-level signal-to-noise ratio
  • minO operates to take the smaller of the two; 73 ⁇ 45( ⁇ ) operates as the transport block size corresponding to the symbol level SNR or the transport block size (TBS CQI) corresponding to the CQI. All UEs; * ⁇ After this check, the process ends.
  • the base station can fully utilize the channel conditions of each UE to obtain a higher sector throughput rate and UE throughput rate.
  • Figure 4 is a cumulative distribution function of sector throughput under different stream selection algorithms.
  • Figure 5 is a cumulative distribution function of UE throughput under different stream selection algorithms. The simulation results of the method of the present invention and other methods are shown in Figures 4 and 5, respectively.
  • the method of the present invention has better system performance than the other three methods.
  • the above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Description

多输入多输出数据流
数目选择方法及系统 技术领域 本发明涉及通信领域，尤其涉及一种多输入多输出数据流数目选择方法 及系统。 背景技术 根据第三代移动通信合作伙伴项目 （ 3GPP )的媒体接入控制层（ MAC ) 规范 TS25.321-750 和 TS36.321-800 可知， 媒体接入控制的增强高速子层 ( MAC-ehs; 对于长期演进（LTE )则是指 MAC )的调度器将决定在一个传 输时间间隔 （TTI ) 内发射一个或二个数据流。 对于支持多入多出（ MIMO )的 WCDMA接入网（ UTRAN和 E-UT AN ) 和支持 MIMO的用户设备（UE ), 基站 （Node B和 eNode B ) 可以在一个 TTI 内给 UE发射一个或二个数据块（将来可能可以更多， 如， 同时发射 4 个数据块：)。 基站在发射一个或多个数据块之前，应该先决定调度哪一个 UE (当然， 盲调度和轮巡调度也是可以使用的）。基站在调度一个 UE之前， 应该先计算 该 UE的调度优先級以 4非序出哪一个 UE先调度（当然，不计算也是可以的）。 基站在计算一个 UE的调度优先级之前， 应该先决定对该 UE即将发射一个 或多个数据块（当然， 盲目地选择数据块的数目和轮流地选择数据块的数目 也是可以的；)。 发明内容 鉴于以上所述的一个或多个问题，本发明提出了一种多输入多输出数据 流数目选择方法及系统， 从仿真结果看， 该方法可以较大地提高扇区吞吐率 和 UE吞吐率。 根据本发明的多输入多输出数据流数目选择方法包括以下步骤： S102, 基站检查各个用户设备的緩冲区状态， 并根据终端上报的倾向于单流的信道 质量指示、 倾向于双流的信道质量指示中对应于第一个流的信道质量指示和 对应于第二个流的信道质量指示确定三种信道质量指示对应的第一高速下行 共享信道（ HS-DSCH或 DL-SCH; 统称 "下行共享数据信道"）符号级信噪 比、 第二下行共享数据信道符号级信噪比、 以及第三下行共享数据信道符号 级信噪比。 S104, 在用户设备的緩冲区低于第一阈值的情况下， 基站发射单 流至用户设备。 S106, 对于一个用户设备， 在第二下行共享数据信道符号级 信噪比和第三下行共享数据信道符号级信噪比中较小的信噪比大于第一下行 共享数据信道符号级信噪比并且第二下行共享数据信道符号级信噪比对应的 传输块大小和第三下行共享数据信道符号级信噪比对应的传输块大小之和大 于第一下行共享数据信道符号级信噪比对应的传输块大小的情况下， 基站发 射双流至用户设备。否则，基站发射单流至用户设备。重复以上 S102至 S106, 直到检查完属于基站的所有用户设备。 其中，基站确定第一下行共享数据信道符号级信噪比、第二下行共享数 据信道符号级信噪比、 以及第三下行共享数据信道符号级信噪比的操作在 S106中执行。 其中， 该方法可以用于宽带码分多址系统。 根据本发明的多输入多输出数据流数目选择系统包括： 緩冲区检测装 置， 位于基站侧， 用于检查各个用户设备的緩冲区状态； 信噪比计算装置， 位于基站侧， 用于根据终端上报的倾向于单流的信道质量指示、 倾向于双流 的信道质量指示中对应于第一个流的信道质量指示和对应于第二个流的信道 质量指示确定三种信道质量指示对应的第一下行共享数据信道符号级信噪 比、 第二下行共享数据信道符号级信噪比、 以及第三下行共享数据信道符号 级信噪比； 以及数据流数目选择装置， 用于在用户设备的緩冲区低于第一阈 值的情况下， 选择将单流发射至用户设备； 对于一个用户设备， 在第二下行 共享数据信道符号级信噪比和第三下行共享数据信道符号级信噪比中较小的 信噪比大于第一下行共享数据信道符号级信噪比并且第二下行共享数据信道 符号级信噪比对应的传输块大小和第三下行共享数据信道符号级信噪比对应 的传输块大小之和大于第一下行共享数据信道符号级信噪比对应的传输块大 小的情况下， 选择将双流发射至用户设备。 否则， 基站发射单流至用户设备。 本发明的系统可以用于宽带码分多址系统和长期演进 ( LTE ) 系统。 通过根据本发明的多输入多输出数据流数目选择方法及系统，较大地提 高了扇区吞吐率和 UE吞吐率。 附图说明 此处所说明的附图用来提供对本发明的进一步理解，构成本申请的一部 分， 本发明的示意性实施例及其说明用于解释本发明， 并不构成对本发明的 不当限定。 在附图中： 图 1是根据本发明的多输入多输出数据流数目选择方法的流程图； 图 2是根据本发明的多输入多输出数据数目选择系统的框图； 图 3 是根据本发明实施例的多输入多输出数据流数目选择方法的流程 图； 图 4是不同的流选择算法下扇区吞吐率的累积分布函数； 以及 图 5是不同的流选择算法下 UE吞吐率的累积分布函数。 具体实施方式 下面参考附图， 详细说明本发明的具体实施方式。 图 1是根据本发明的多输入多输出数据流数目选择方法的流程图。如图 1所示， 该方法包括以下步-骤：
S102,基站检查各个用户设备的緩冲区状态，并根据终端上报的倾向于 单流的信道质量指示、 倾向于双流的信道质量指示中对应于第一个流的信道 质量指示和对应于第二个流的信道质量指示确定三种信道质量指示对应的第 一下行共享数据信道符号级信噪比、 第二下行共享数据信道符号级信噪比、 以及第三下行共享数据信道符号级信噪比。
S104,在用户设备的緩冲区低于第一阁值的情况下，基站发射单流至用 户设备。
S106,对于一个用户设备，在第二下行共享数据信道符号级信噪比和第 三下行共享数据信道符号级信噪比中较小的信噪比大于第一下行共享凝:据信 道符号级信噪比并且第二下行共享数据信道符号级信噪比对应的传输块大小 和第三下行共享数据信道符号级信噪比对应的传输块大小之和大于第一下行 共享数据信道符号級信噪比对应的传输块大小的情况下， 基站发射双流至用 户设备。 否则， 基站发射单流至用户设备。 重复以上 S102至 S106,直到检查完属于该基站艮务下行共享数据信道 小区的所有用户设备。 其中，基站确定第一下行共享数据信道符号级信噪比、第二下行共享数 据信道符号级信噪比、 以及第三下行共享数据信道符号级信噪比的操作在 S106中执行。 其中， 本发明的方法可以用于宽带码分多址系统。 图 2 是根据本发明的多输入多输出数据数目选择系统的框图。 如图 2 所示， 该系统包括： 緩冲区检测装置 202, 位于基站侧， 用于检查各个用户 设备的緩冲区状态； 信噪比计算装置 204, 位于基站侧， 用于根据终端上报 的倾向于单流的信道质量指示、 倾向于双流的信道质量指示中对应于第一个 流的信道质量指示和对应于第二个流的信道质量指示确定三种信道质量指示 对应的第一下行共享数据信道符号级信噪比、 第二下行共享数据信道符号级 信噪比、 以及第三下行共享数据信道符号级信噪比； 以及数据流数目选择装 置 206, 用于在用户设备的緩冲区低于第一阈值的情况下， 选择将单流发射 至用户设备； 对于一个用户设备， 在第二下行共享数据信道符号级信噪比和 第三下行共享数据信道符号级信噪比中较小的信噪比大于第一下行共享数据 信道符号级信噪比并且第二下行共享数据信道符号级信噪比对应的传输块大 小和第三下行共享数据信道符号级信噪比对应的传输块大小之和大于第一下 行共享数据信道符号级信噪比对应的传输块大小的情况下， 选择将双流发射 至用户设备。 否则， 基站发射单流至用户设备。 目前， 基于 3GPP Release 7 版本的 MIMO 方案是双流发射分集 ( D-TxAA ) (将来的 3GPP Release 8/9/10版本将继承并发展 D-TxAA方案；)。 终端 居自身的信道状况报告倾向于单流的信道质量指示 （ CQIS ) (在 0 - 30 之间）和倾向于双流的 CQID (在 31-255之间）。基站在收到 CQID之后，将 CQID 拆分成对应于第一个流的 CQI, (在 0-14之间）和对应于第二个流的 CQI2 (在 0—14之间；)。 为充分利用上述信息， 本发明提出了一种用于确定发射 MIMO数据流 个数的方法。如图 1所示。如果没有特别说明，这里的基站（Node B或 eNode B )、无线网控制器（ RNC )、融合了 RNC的增强型基站（Node B+或 eNode B ), UE都支持 D-TxAA 方式的 MIMO。 另夕卜， 如果没有特别说明， 这里的基站 可以是无 RNC功能的 Node B，也可以是有 RNC功能的 Node B+或 eNode B。 图 3 是根据本发明实施例的多输入多输出数据流数目选择方法的流程 图。 如图 3所示， 该方法包括以下步驟：
S302 , 基站逐个检查各个 UE的緩冲区直到所有的 UE都检查完毕。
S304 , 如果某 UE的緩冲区低于 Buffer _ Least比特（第一阀值）， 那么基 站对该 UE只发射单流。 这里取 — etwt = 9496比特。
S306 , 基站根据 CQIS、 CQI,和 CQI2来推算出这三种 CQI所对应的下行 共享数据信道符号级信噪比 （SNR ): (第一下行共享数据信道符号级信 噪比）、 L (第二下行共享数据信道符号级信噪比） 和^! (第三下行共享 数据信道符号级信噪比）。 这一步可以在步骤 S302 之前， 也可在步骤 S304 之后。
S308 , 如 果 对 某 UE 有 ηώι , -^) > 并 且
No No No
(TBS^) + TBS( )) > TBS(¾ , 那么基站对该 UE发射双流。 除此之外，
N0 No No 都发射单流。 其中， minO)操作为取二者中的较小者； 7¾5(·)操作为该符号 级 SNR所对应的传输块大小或者 CQI所对应的传输块大小 （ TBS CQI )。 所有 UE；*卩这样检查完之后则流程结束。 通过上述方法之后， 基站可以充分利用各个 UE的信道状况， 获得较高 的扇区吞吐率和 UE吞吐率。 图 4是不同的流选择算法下扇区吞吐率的累积 分布函数。 图 5是不同的流选择算法下 UE吞吐率的累积分布函数。 本发明 的方法与其他方法的仿真结果对比分别如图 4和图 5所示。从这两个图可知， 本发明的方法比其他 3种方法具有更好的系统性能。 以上所述仅为本发明的优选实施例而已， 并不用于限制本发明，对于本 领域的技术人员来说， 本发明可以有各种更改和变化。 凡在本发明的精神和 原则之内， 所作的任何修改、 等同替换、 改进等， 均应包含在本发明的保护 范围之内。

Claims

权 利 要 求 书 一种多输入多输出数据流数目选择方法， 其特征在于， 包括以下步驟：
S102, 基站检查各个用户设备的緩冲区状态， 并根据终端上报的倾 向于单流的信道质量指示、 倾向于双流的信道质量指示中对应于第一个 流的信道质量指示和对应于第二个流的信道质量指示确定所述三种信道 质量指示对应的第一下行共享数据信道符号级信噪比、 第二下行共享数 据信道符号级信噪比、 以及第三下行共享数据信道符号级信噪比；
S104, 在所述用户设备的緩冲区低于第一阔值的情况下， 所述基站 发射单流至所述用户设备； 以及
S106,对于一个用户设备， 在所述第二下行共享数据信道符号级信 噪比和第三下行共享数据信道符号级信噪比中较小的信噪比大于所述第 一下行共享数据信道符号级信噪比并且所述第二下行共享数据信道符号 级信噪比对应的传输块大小和所述第三下行共享数据信道符号级信噪比 对应的传输块大小之和大于所述第一下行共享数据信道符号级信噪比对 应的传输块大小的情况下， 所述基站发射双流至所述用户设备； 否则， 基站发射单流至用户设备；
重复以上 S102至 S106 , 直到检查完属于基站的所有用户设备。 根据权利要求 1所述的多输入多输出数据流数目选择方法，其特征在于， 所述基站确定所述第一下行共享数据信道符号级信噪比、 第二下行共享 数据信道符号级信噪比、 以及第三下行共享数据信道符号级信噪比的操 作在所述 S106中执行。 根据权利要求 1所述的多输入多输出数据流数目选择方法，其特征在于， 所述方法用于宽带码分多址系统。 一种多输入多输出数据流数目选择系统， 其特征在于包括：
緩冲区检测装置， 位于基站侧， 用于检查各个用户设备的緩冲区状 态；
信噪比计算装置， 位于基站侧， 用于根据终端上报的倾向于单流的 信道质量指示、 倾向于双流的信道质量指示中对应于第一个流的信道质 量指示和对应于第二个流的信道质量指示确定所述三种信道质量指示对 应的第一下行共享数据信道符号级信噪比、 第二下行共享数据信道符号 级信噪比、 以及第三下行共享数据信道符号级信噪比； 以及
数据流数目选择装置，用于在所述用户设备的緩冲区低于第一阈值 的情况下， 选择将单流发射至所述用户设备； 对于一个用户设备， 在所 述第二下行共享数据信道符号级信噪比和第三下行共享数据信道符号级 信噪比中较小的信噪比大于所述第一下行共享数据信道符号级信噪比并 且所述第二下行共享数据信道符号级信噪比对应的传输块大小和所述第 三下行共享数据信道符号级信噪比对应的传输块大小之和大于所述第一 下行共享数据信道符号级信噪比对应的传输块大小的情况下， 选择将双 流发射至所述用户设备； 否则， 基站发射单流至用户设备。 根据权利要求 4所述的多输入多输出数据流数 选择系统，其特征在于， 所述系统用于宽带码分多址系统。
PCT/CN2007/003782 2007-08-03 2007-12-25 Methods and systems for selecting the number of mimo data streams Ceased WO2009018698A1 (en)

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