WO2008052479A1 - Procédé et dispositif de signalisation d'indicateur de qualité de canal - Google Patents

Procédé et dispositif de signalisation d'indicateur de qualité de canal Download PDF

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Publication number
WO2008052479A1
WO2008052479A1 PCT/CN2007/070985 CN2007070985W WO2008052479A1 WO 2008052479 A1 WO2008052479 A1 WO 2008052479A1 CN 2007070985 W CN2007070985 W CN 2007070985W WO 2008052479 A1 WO2008052479 A1 WO 2008052479A1
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Prior art keywords
cqi
information
differential
resource
level
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PCT/CN2007/070985
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English (en)
French (fr)
Inventor
Yu Tang
Deping Liu
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Huawei Technologies Co., Ltd.
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Priority to CN2007800339235A priority Critical patent/CN101518012B/zh
Publication of WO2008052479A1 publication Critical patent/WO2008052479A1/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
    • H04L1/0001Systems 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
    • H04L1/0028Formatting
    • H04L1/0029Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling

Definitions

  • the present invention relates to the field of wireless communication networks, and more particularly to a method and apparatus for indicating channel quality. Background technique
  • the channel of a wireless communication system exhibits a frequency selective fading phenomenon, that is, different frequency points on the system bandwidth can exhibit different degrees of fading at the same time.
  • a communication system based on Orthogonal Frequency Division Multiple Access (OFDM) and Single-Carrier Frequency Division Multiple Access (SC-FDMA) transmission technologies may select according to different terminal frequencies.
  • the fading condition is scheduled, and the frequency domain sub-band is scheduled to the terminal with good channel quality on the sub-band, thereby improving the throughput performance of the system.
  • the frequency domain scheduling relies on the terminal to report an accurate and comprehensive channel quality indicator (CQI) information to the base station, and the base station can also select an optimal modulation and coding scheme (MCS) according to the CQI information. Thereby the transmission performance of the system is optimized.
  • CQI information may use different metric parameters such as an average signal to noise ratio, an equivalent signal to noise ratio, or mutual information.
  • the CQI information is usually represented by a number of bits, and the different CQI values are usually - corresponding to different channel quality levels and MSC levels.
  • the method for reporting CQI information in the prior art is implemented as follows: Selecting one CQI information as reference information, generally selecting full CQI information of the channel quality optimal resource point in the entire bandwidth as reference information, or selecting the best resource over the entire bandwidth.
  • the CQI information of the average channel quality of the points is used as reference information.
  • the reference information and the differential CQI level of each resource point are then reported to the base station.
  • the prior art reduces the transmission amount of CQI information by differential modulation.
  • the prior art can only set a differential CQI level for a case where the CQI difference information is small, when the CQI difference information of some resource points is larger than a certain range. There is no corresponding differential CQI level, so this prior art cannot guarantee full reporting of CQI information.
  • the number of subbands in the prior art that reflect the channel quality by the differential CQI level may be uncertain, so that the signaling length of each report is not fixed.
  • the method for reporting CQI information in the prior art 2 is implemented by: selecting several sub-bands with the best channel quality, and indicating the positions of the sub-bands with the best channel quality by using the resource location indication sequence, and then calculating the best of all channel qualities.
  • the average value of the CQI information is sent to the base station, and the CQI information of the remaining subbands in the bandwidth is averaged, and the value is reported to the base station.
  • the prior art can minimize the signaling overhead of CQI reporting.
  • the prior art reduces the accuracy and comprehensiveness of CQI information reporting, and the performance is directly limited by the optimal number of subbands of channel quality.
  • the CQI information provided by the scheme is insufficient, resulting in a large performance loss of the system.
  • Embodiments of the present invention provide a method and apparatus for reporting a channel quality indication, and the method and apparatus can enable CQI difference information of each resource point to have a corresponding differential CQI level.
  • the method for reporting channel quality indication provided by the present invention includes:
  • the present invention provides a method for processing a channel quality indicator.
  • the base station receives the reference information reported by the terminal and the differential CQI level of the resource point, and calculates the CQI of the resource point according to the CQI difference information set by the terminal for each differential CQI level. information.
  • the device provided by the present invention for reporting channel quality indication includes:
  • a differential modulation unit configured to perform differential modulation on the CQI information to be reported to the resource point, to obtain CQI difference information of the resource point;
  • the CQI information processing unit determines the differential CQI level of the resource point according to the obtained CQI difference information of the resource point and the differential CQI level-CQI difference information comparison table;
  • a sending unit configured to send the reference information of the CQI information differential modulation and the determined differential CQI level of the resource point to the base station.
  • a channel quality indicator CQI is selected from the channel bandwidth as reference information, and CQI information of each resource point is differentially modulated according to the reference information to obtain CQI difference information of each resource point, and then The different CQI difference information is quantized, and the same, different, or partially identical CQI difference information is set for each differential CQI level, so that the embodiment of the present invention can set the CQI difference information for each resource point.
  • the differential CQI level in turn, enables the terminal to report CQI information more comprehensively.
  • a plurality of resource points with the best channel quality are selected on the basis of setting a differential CQI level for the CQI difference information of each resource point, and then the CQI information of the resource point is differentially modulated.
  • the CQI difference information is obtained, and the difference information is quantized to obtain a differential CQI level corresponding to the channel quality optimal resource point, so that the CQI information of the channel quality optimal resource point can be obtained relatively accurately.
  • Embodiment 1 is a flowchart of a method according to Embodiment 1 of the present invention.
  • FIG. 3 is a schematic diagram of a device according to Embodiment 1 of the present invention.
  • FIG. 4 is a schematic diagram of a device according to Embodiment 2 of the present invention. detailed description
  • An embodiment of the present invention provides a method for reporting a channel quality indicator, where the method firstly Selecting a channel quality indicator CQI as reference information on the channel bandwidth, and performing differential modulation on the CQI information of the resource point to be reported according to the reference information to obtain CQI difference information of each resource point; quantifying different CQI difference information, first setting a difference The number of CQI levels is set, and the number of CQI difference information that is the same, different, or partially identical is set for each differential CQI level.
  • FIG. 1 is a flowchart of a method according to Embodiment 1 of the present invention, and the process includes the following steps:
  • Step 101 Select a CQI information from the channel bandwidth as reference information.
  • Step 102 Perform differential modulation on the CQI information and the reference information of the to-be-reported resource point to obtain CQI difference information of each resource point, where the differential modulation is a difference between the reference information and the CQI information.
  • the resource point may be a subband in the frequency domain, a time in the time domain, a data stream in the space domain, or a free combination of the three, such as a certain subband at a certain moment, a certain data stream. At some point, a sub-band at a certain moment in a data stream.
  • the resource points in this embodiment are exemplified by sub-bands in the frequency domain.
  • the sub-bands are a part of the bandwidth divided from the system bandwidth, and the sub-bands are usually the smallest unit in the system frequency domain scheduling.
  • Table 1 the quantized CQI information on all 12 subbands at a certain time channel is shown in Table 1:
  • SB 6 is the subband with the best channel quality, and its CQI information is used as reference information.
  • the CQI information on each subband is differentially modulated with reference to the reference information to obtain CQI difference information.
  • the CQI difference information obtained after differential modulation of each sub-band is as shown in Table 2:
  • Step 103 Quantify CQI difference information of different values. Set the number of differential CQI levels.
  • the CQI information reflects 32 channel quality levels, denoted as: F-CQI. (00000) to F-CQI 3 i (lllll), wherein different F-CQI levels correspond to MCS levels, and are respectively recorded as: MCSQ to MCS 31 . If the differential CQI level is represented by 3 bits, then 8 differential CQI levels can be reflected, which are recorded as: D-CQIQ to D-CQI 7 .
  • Step 104 Set CQI difference information that is not exactly the same for each differential CQI level.
  • the quantization interval is also small.
  • the number of CQI difference information corresponding to the differential CQI level 000, 001, etc. is 1, which indicates that the quantization interval of the differential CQI level is 1.
  • the quantization interval is also larger.
  • the quantization interval corresponding to the differential CQI level 101 is 4, and the quantization interval corresponding to the differential CQI level 111 is 16.
  • Step 105 Obtain a differential CQI level of each resource point from the quantization result.
  • the reference information is 10011, referring to Table 1, the binary of the CQI difference information of the sub-band SB is 10000, which is converted into decimal and 16th.
  • the D-CQI level corresponding to the sub-band is 111. That is, the quantization level corresponding to the sub-band is 7.
  • the D-CQI level and reference information corresponding to the 12 sub-bands in the above example can be obtained, as shown in Table 4.
  • Step 106 The terminal sends the reference information and the differential CQI level of each resource point to the base station. Generally, after receiving the reference information reported by the terminal and the differential CQI level of the resource point, the base station can calculate the CQI information on each resource point according to the CQI difference information set by the terminal for each differential CQI level.
  • the embodiment is compared with the prior art.
  • the length is not fixed, but the present embodiment can report the differential CQI level of all subbands while ensuring 31.7% of the feedback signaling overhead, and can keep the feedback control signaling length fixed.
  • FIG. 2 is a flowchart of a method according to Embodiment 2 of the present invention, where the process includes the following steps:
  • Step 201 Select a CQI information from the channel bandwidth as reference information.
  • Step 202 Select, from the channel bandwidth, a plurality of resource points with the best channel quality, and use the resource location indication sequence to indicate the location of the resource points with the best channel quality.
  • Step 203 Perform differential modulation on the CQI information of the channel quality optimal resource point according to the reference information to obtain CQI difference information of the resource points, where the differential modulation is a difference between the reference information and the CQI information.
  • Step 204 Quantize CQI difference information of different values, first set the number of differential CQI levels.
  • Step 205 Set CQI difference information of different numbers for each differential CQI level, so that the quantization intervals of each differential CQI level are different. For a small differential CQI level with a small value, the quantization interval is also small; on the contrary, the quantization interval is also larger.
  • Step 206 Obtain a differential CQI level of the channel quality optimal resource point from the quantization result.
  • Step 207 The terminal reports the differential CQI level, the resource location indication sequence, and the reference information of the resource quality optimal resource points to the base station.
  • Step 208 Average the CQI information of the remaining resource points on the channel bandwidth, and report the average value to the base station.
  • the software implementing the method of the present invention can be stored in a computer readable storage medium, and when executed, the software includes the following steps:
  • the CQI difference information of different values is quantized, firstly, the number of differential CQI levels is set, and the number of CQI difference information of the same, different or partially identical is set for each differential CQI level.
  • the storage medium includes a ROM/RAM, a magnetic disk, an optical disk, and the like.
  • an embodiment of the present invention also provides an apparatus for reporting a channel quality indicator.
  • the apparatus includes a first differential modulation unit 301, a first quantization unit 302, and a transmitting unit 303.
  • the first differential modulating unit 301 is configured to select one CQI information from the channel bandwidth as the reference information, and perform differential modulation on the CQI information of the resource point to obtain the CQI difference information of each resource point according to the reference information, where Differential modulation is the difference between the reference information and the CQI information.
  • the resource point can be a subband in the frequency domain, a time in the time domain, a data stream in the spatial domain, or a free combination of the three, such as A subband at a certain moment, a certain moment in a data stream, a subband at a certain moment in a data stream, and so on.
  • the first quantization unit 302 is configured to quantize different CQI difference information obtained by the first differential modulation unit 301, and set a differential CQI level number, and set CQI difference information that is not exactly the same for each differential CQI level.
  • the quantization interval corresponding to each differential CQI level is also different.
  • the quantization interval is also small; The larger the interval, the so-called non-uniformity quantification.
  • the sending unit 303 is configured to acquire the differential CQI level of each resource point from the first quantization unit 302, and obtain reference information from the first differential modulation unit 301, and report the reference information and the differential CQI level to the base station.
  • the embodiment of the present invention also provides another reporting channel quality indicator device.
  • the device includes a second differential modulation unit 401, a second quantization unit 402, a sending unit 403, and an averaging unit 404.
  • the second differential modulation unit 401 is configured to select one CQI information from the channel bandwidth as reference information, and select some resource points with the best channel quality from the channel bandwidth, and use the resource location indication sequence to optimize the quality of the channels.
  • the location indication is performed, and the CQI information of the resource points is differentially modulated according to the reference information to obtain CQI difference information of the channel quality optimal resource points, and the CQI information of the unselected resource points is provided to the mean unit 404.
  • differential modulation is to calculate the difference between the reference information and the CQI information.
  • the averaging unit 404 is configured to acquire CQI information on the unselected resource points from the second differential modulating unit 401, and average the CQI information.
  • the second quantization unit 402 is configured to quantize different CQI difference information obtained by the second differential modulation unit 401, set a differential CQI level, and set CQI difference information that is not identical for each differential CQI level. In this way, the quantization interval corresponding to each differential CQI level is not completely the same, and for the differential CQI level with a small value, the quantization interval is also small; on the contrary, the quantization interval is also larger.
  • the sending unit 403 is configured to acquire the differential CQI level of each resource point from the second quantization unit 402, and obtain the reference information and the resource location indication sequence from the second differential modulation unit 401, and acquire the unselected resource points from the averaging unit 404.
  • the CQI average value is used to report the reference information, the differential CQI level, the resource location indication sequence, and the average of the CQI information of the unselected resource points to the base station.
  • both embodiments of the method and apparatus of the present invention report CQI information by using a non-uniform quantization difference method, and the quantization granularity is small when the channel quality is good/differential CQI level is small, and the channel quality is poor.
  • the quantization granularity is large, so that the CQI difference information of each resource point has a corresponding differential CQI level, thereby ensuring the implementation of the present invention.
  • the differential CQI level of all resource points in the full frequency band can be reported to the base station.
  • the first implementation manner of the method and apparatus of the present invention does not require a resource location indication sequence when fully reporting, thereby saving signaling overhead of the system.
  • the number of resource points that reflect the channel quality by the differential CQI level is determined, thereby ensuring that the signaling length of each report is fixed, thereby simplifying the process of signaling decoding.
  • the second embodiment of the method and apparatus of the present invention selects only the resources with the best channel quality based on the differential CQI level set for the CQI difference information of each resource point. Point, and then report the differential CQI level and resource location indication sequence of the channel quality optimal resource point. For resource points with poor channel quality, the average value is obtained, and then the average value of the CQI information is reported.
  • This embodiment can only accurately report the CQI information of some resource points, and can also save the signaling overhead of the system.

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Description

上报信道盾量指示的方法与装置
本申请要求于 2006 年 10 月 30 日提交中国专利局、 申请号为 200610150375.1、 发明名称为 "对信道质量指示进行量化的方法与装置 "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
本发明涉及无线通信网络领域, 尤其涉及上 信道质量指示的方法与 装置。 背景技术
无线通信系统的信道会呈现频率选择性衰落现象, 也就是系统带宽上 的不同频率点在同一时刻可以表现出不同的衰落程度。 例如, 基于正交频 分多址 ( OFDMA, Orthogonal Frequency Division Multiple Access )和单载 波频分多址 ( SC-FDMA, Single-Carrier Frequency Division Multiple Access ) 等传输技术的通信系统会根据不同终端频率选择性衰落情况进行调度, 将 频域子带调度给在该子带上信道质量较好的终端, 从而可以提高系统的吞 吐量性能。
然而, 频域调度依赖于终端向基站上报准确而全面的信道质量指示 ( CQI, Channel Quality Indicator )信息, 同时基站还可以根据 CQI信息选 择最佳调制编码方式(MCS , Modulation and Coding Scheme )等级, 从而 使系统的传输性能达到最优。 但是, 终端准确而全面的上报 CQI信息需要 较大的数据量, 这样会导致系统的信令开销较大。 其中, 所述 CQI信息可 以釆用平均信噪比、 等效信噪比或互信息等不同的量度参数。 通常用若干 比特表示 CQI信息, 不同的 CQI取值通常——对应不同的信道质量等级和 MSC等级。
现有技术一中上报 CQI信息的方式是这样实现的: 选取一个 CQI信息 作为参考信息, 通常选取整个带宽上信道质量最佳资源点的全 CQI信息作 为参考信息, 或者选取整个带宽上最佳资源点的平均信道质量的 CQI信息 作为参考信息。 再将所有资源点的 CQI信息和参考信息进行比较得到各个 资源点的 CQI差别信息; 对所述差别信息进行量化, 首先设置一定数量的 差分 CQI等级, 再为每个差分 CQI等级设置相同的 CQI差别信息个数。 接 着将参考信息和各资源点的差分 CQI等级上报给基站。 该现有技术是通过 差分调制减少 CQI信息的传输量, 但是, 该现有技术只能对 CQI差别信息 较小的情况设置差分 CQI等级, 当一些资源点的 CQI差别信息大于某个范 围时就没有对应的差分 CQI等级了,因此该现有技术不能保证全面上报 CQI 信息。 另外, 该现有技术通过差分 CQI等级反映信道质量的子带个数可能 是不确定的, 从而导致每次上报的信令长度是不固定的。
现有技术二中上报 CQI信息的方式是这样实现的: 选取信道质量最佳 的若干子带, 并用资源位置指示序列对信道质量最佳的这些子带的位置进 行指示, 然后计算所有信道质量最佳子带 CQI信息的平均值, 将该平均值 和资源位置指示序列上 ^艮给基站;对带宽中所剩子带的 CQI信息求平均值, 再将该值上报给基站。 该现有技术可以最大程度上减少 CQI上报的信令开 销, 但是, 该现有技术会降低 CQI信息上报的准确度和全面性, 并且性能 还会直接受信道质量最佳子带个数的限制, 当该上报子带数和实际调度的 子带个数产生偏差时, 由于该方案提供的 CQI信息不充分, 从而导致系统 会有较大的性能损失。
综上所述,上述两种现有技术在节省系统信令开销的同时不能实现 CQI 信息的全面上报。 发明内容
本发明实施例提供上报信道质量指示的方法与装置, 所述方法与装置 能够使每个资源点的 CQI差别信息都有对应的差分 CQI等级。
本发明提供的一种上报信道质量指示的方法, 包括:
从信道带宽上选取一个信道质量指示 CQI作为参考信息;
分别将待上报的资源点的 CQI信息和所述参考信息进行差分调制得到 所述各资源点的 CQI差别信息;
才艮据所述资源点的 CQI差别信息和差分 CQI等级 - CQI差别信息对照 表得到该资源点的差分 CQI等级; 所述差分 CQI等级 - CQI差别信息对照 表中, 至少两个差分 CQI等级中包含不同的 CQI差别信息个数;
将所述参考信息和所述资源点的差分 CQI等级上报给基站。 本发明提供的一种处理信道质量指示的方法, 基站接收终端上报的参 考信息和资源点的差分 CQI等级, 再根据终端为每个差分 CQI等级设置的 CQI差别信息计算得到该资源点上的 CQI信息。
本发明提供的一种上报信道质量指示的装置, 包括:
差分调制单元, 用于对待上报资源点的 CQI信息进行差分调制, 以得 到该资源点的 CQI差别信息;
CQI信息处理单元, 才艮据所得到的资源点的 CQI差别信息和差分 CQI 等级 -CQI差别信息对照表确定该资源点的差分 CQI等级;
发送单元, 用于发送所述 CQI信息差分调制釆用的参考信息和所确定 的该资源点的差分 CQI等级给基站。
本发明的实施例提供的技术方案中, 首先从信道带宽上选取一个信道 质量指示 CQI作为参考信息, 根据参考信息对各资源点的 CQI信息进行差 分调制得到各资源点的 CQI差别信息, 再对不同取值的 CQI差别信息进行 量化, 并为每个差分 CQI等级设置相同、 不相同或部分相同的 CQI差别信 息个数, 这样使本发明实施例能够为每个资源点的 CQI差别信息设置对应 的差分 CQI等级, 进而可使终端能够更全面的上报 CQI信息。
另外, 本发明的另一实施例中, 在对每个资源点的 CQI差别信息设置 差分 CQI等级的基础上选取信道质量最佳的若干资源点, 然后对所述资源 点的 CQI信息进行差分调制得到 CQI差别信息, 再对所述差别信息进行量 化得到信道质量最佳资源点所对应的差分 CQI等级, 这样能够较为准确得 到信道质量最佳资源点的 CQI信息。 附图说明
图 1是本发明实施方式一的方法流程图;
图 2是本发明实施方式二的方法流程图;
图 3是本发明实施方式一的装置示意图;
图 4是本发明实施方式二的装置示意图。 具体实施方式
本发明实施例提供了一种上报信道质量指示的方法, 该方法首先从信 道带宽上选取一个信道质量指示 CQI作为参考信息, 根据参考信息将待上 报资源点的 CQI信息进行差分调制得到各资源点的 CQI差别信息; 对不同 取值的 CQI差别信息进行量化, 首先设置差分 CQI等级个数, 再为每个差 分 CQI等级设置相同、 不相同或部分相同的 CQI差别信息个数。
为使本领域技术人员能够更好地理解本发明, 下面结合附图对本发明 实施例进行详细说明。
参照图 1 , 图 1是本发明实施方式一的方法流程图, 该流程包括以下步 骤:
步骤 101、 从信道带宽上选取一个 CQI信息作为参考信息。
步骤 102、 将待上报资源点的 CQI信息和参考信息进行差分调制得到 各资源点的 CQI差别信息, 所述差分调制就是计算参考信息和 CQI信息的 差值。 其中, 资源点可以是频域上的一个子带, 时域上的一个时刻, 空间 域上的一个数据流, 或者三者的自由组合, 如某个时刻的某个子带, 某个 数据流的某个时刻, 某个数据流上某个时刻的某个子带等。
本实施方式的资源点是以频域上的子带来举例说明的, 所述子带就是 从系统带宽上划分出来的一部分带宽, 子带通常是系统频域调度中的最小 单位。 假设某一时刻信道带宽上全部 12个子带上量化后的 CQI信息如表 1 所示:
表 1
Figure imgf000006_0001
由表 1可知, SB6是信道质量最佳的子带, 以它的 CQI信息作为参考信 息, 各子带上的 CQI信息均参照该参考信息来进行差分调制得到 CQI差别 信息。 各子带经过差分调制后得到的 CQI差别信息具体如表 2所示:
表 2
Figure imgf000007_0001
由表 2可知, 子带 SB" SB5、 SB9、 SBu、 SB12的 CQI信息与参考信息 的差别信息大于 7 (即二进制的 111 ),对现有技术一来说 3个比特不能表示 子带的差别信息大于 7的情况, 故而不能上报这些子带的差分 CQI等级, 同时还需要资源位置指示序列对上报差分 CQI等级的子带位置进行指示。
步骤 103、 对不同取值的 CQI差别信息进行量化。 设置差分 CQI等级 的个数。
假设用 5个比特表示 CQI信息, 那么 CQI信息反映 32个信道质量等 级, 记为: F-CQI。(00000)到 F-CQI3i(lllll), 其中, 不同的 F-CQI等级又和 MCS等级——对应, 并分别记为: MCSQ到 MCS31。 如果用 3比特表示差分 CQI等级, 那么就可以反映 8种差分 CQI等级, 记为: D-CQIQ到 D-CQI7
步骤 104、为每个差分 CQI等级设置个数不完全相同的 CQI差别信息。 对于取值小的差分 CQI等级, 其量化间隔也小, 例如差分 CQI等级 000、 001等所对应的 CQI差别信息个数为 1 , 这表明该差分 CQI等级的量化间 隔为 1。 反之, 量化间隔也越大, 例如差分 CQI等级 101对应的量化间隔 为 4 , 差分 CQI等级 111对应的量化间隔为 16。 由表 3可知, 每个 D-CQI 等级所对应的 CQI差别信息个数不全相同, 也就是量化间隔不全相同, 这 就是所谓的非均匀量化方式。 差分 CQI等级 -CQI差别信息对照表, 如表 3 所示。
表 3
Figure imgf000007_0002
其中, 为每个差分 CQI等级设置的 CQI差别信息个数可完全不同, 也 可完全相同, 还可以部分相同, 部分不相同。 步骤 105、 由量化结果得到各资源点的差分 CQI等级。 如, 参考信息 为 10011时, 参照表 1 , 得到子带 SB 的 CQI差别信息的二进制为 10000, 转化为十进制后为 16, 通过查找表 3 可得到该子带对应的 D-CQI等级为 111 , 也就是该子带对应的量化电平为 7 , 同理可得到上述例中 12个子带对 应的 D-CQI等级和参考信息, 具体见表 4。
表 4
Figure imgf000008_0001
步骤 106、 终端将参考信息和各资源点的差分 CQI等级上 给基站。 通常基站在收到终端上报的参考信息和资源点的差分 CQI等级之后, 根据终端为每个差分 CQI等级设置的 CQI差别信息就可以计算得到各资源 点上的 CQI信息。
下面将该实施方式和现有技术一进行比较, 在子带数为 12的情况下, 现有技术一在 12个子带的差分 CQI等级都能上报时,通过差分调制才能节 省 [12x5-(5+12x3)]/(12x5)=31.7%的反馈信令开销,如果有些子带的差分 CQI 等级不能上报时那么节省的反馈信令开销低于 31.7%,并且还会导致每次上 报的信令长度不固定,但是本实施方式在保证节省 31.7%的反馈信令开销的 同时还能上报所有子带的差分 CQI等级, 并且可以保持反馈控制信令长度 固定。
参照图 2, 图 2是本发明实施方式二的方法流程图, 所述流程包括以下 步骤:
步骤 201、 从信道带宽上选取一个 CQI信息作为参考信息。
步骤 202、从信道带宽上选取信道质量最佳的若干资源点, 并用资源位 置指示序列对这些信道质量最佳的资源点位置进行指示。
步骤 203、 根据参考信息对信道质量最佳资源点的 CQI信息进行差分 调制得到这些资源点的 CQI差别信息, 其中, 差分调制就是计算参考信息 和 CQI信息的差值。
步骤 204、 对不同取值的 CQI差别信息进行量化, 首先设置差分 CQI 等级的个数。 步骤 205、为每个差分 CQI等级设置个数不完全相同的 CQI差别信息, 这样使每个差分 CQI等级的量化间隔不相同。对于取值小的差分 CQI等级, 其量化间隔也小; 反之, 量化间隔也越大。
步骤 206、 由量化结果得到信道质量最佳资源点的差分 CQI等级。 步骤 207、 终端将信道质量最佳若干资源点的差分 CQI等级、 资源位 置指示序列以及参考信息上报给基站。
步骤 208、 对信道带宽上所剩资源点的 CQI信息求平均值, 再将该平 均值上报给基站。
实现本发明方法的软件可以存储于一计算机可读取存储介质中, 该软 件在执行时, 包括如下步骤:
从信道带宽上选取一个信道质量指示 CQI作为参考信息, 根据参考信 息将待上报资源点的 CQI信息进行差分调制得到各资源点的 CQI 差别信 息;
对不同取值的 CQI差别信息进行量化, 首先设置差分 CQI等级个数, 再为每个差分 CQI等级设置相同、不相同或部分相同的 CQI差别信息个数。
其中, 所述存储介质包括 ROM/RAM、 磁碟、 光盘等。
根据方法实施方式一, 本发明实施例也提供了一种上报信道质量指示 的装置, 参照图 3 , 该装置包括第一差分调制单元 301、 第一量化单元 302 和发送单元 303。
其中, 第一差分调制单元 301用于从信道带宽上选取一个 CQI信息作 为参考信息, 以及根据参考信息将待上 "^资源点的 CQI信息进行差分调制 得到各个资源点的 CQI差别信息,其中,差分调制就是计算参考信息和 CQI 信息的差值。 另外, 资源点可以是频域上的一个子带, 时域上的一个时刻, 空间域上的一个数据流, 或者三者的自由组合, 如某个时刻的某个子带, 某个数据流的某个时刻, 某个数据流上某个时刻的某个子带等。
其中,第一量化单元 302用于对第一差分调制单元 301得到的不同 CQI 差别信息进行量化, 并设置差分 CQI等级个数, 以及为每个差分 CQI等级 设置个数不完全相同的 CQI差别信息, 从而使每个差分 CQI等级对应的量 化间隔也不同。 对于取值小的差分 CQI等级, 其量化间隔也小; 反之, 量 化间隔也越大, 这就是所谓的非均勾量化。
其中,发送单元 303用于从第一量化单元 302获取各资源点的差分 CQI 等级, 以及从第一差分调制单元 301 获取参考信息, 再将所述参考信息和 差分 CQI等级上报给基站。
根据方法实施方式二, 本发明实施例也提供了另一种上报信道质量指 示装置, 参照图 4, 该装置包括第二差分调制单元 401、 第二量化单元 402、 发送单元 403和均值单元 404。
其中, 第二差分调制单元 401用于从信道带宽上选取一个 CQI信息作 为参考信息, 以及从信道带宽上选取信道质量最佳的若干资源点, 并用资 源位置指示序列对这些信道质量最佳的子带位置进行指示, 再根据参考信 息对所述资源点的 CQI信息进行差分调制得到这些信道质量最佳资源点的 CQI差别信息, 以及向均值单元 404提供没有被选资源点的 CQI信息。 其 中, 差分调制就是计算参考信息和 CQI信息的差值。
其中, 均值单元 404用于从第二差分调制单元 401获取未被选取资源 点上的 CQI信息, 以及对所述 CQI信息求平均值。
其中,第二量化单元 402用于对第二差分调制单元 401得到的不同 CQI 差别信息进行量化, 再设置差分 CQI等级个数, 以及为每个差分 CQI等级 设置个数不完全相同的 CQI差别信息, 这样使得每个差分 CQI等级对应的 量化间隔不完全相同, 对于取值小的差分 CQI等级, 其量化间隔也小; 反 之, 量化间隔也越大。
其中,发送单元 403用于从第二量化单元 402获取各资源点的差分 CQI 等级, 以及从第二差分调制单元 401 获取参考信息和资源位置指示序列, 以及从平均单元 404获取未被选取资源点的 CQI平均值, 再将所述参考信 息、 差分 CQI等级、 资源位置指示序列以及未被选取资源点的 CQI信息的 平均值上报给基站。
由上述可知, 本发明方法与装置的两种实施方式都是釆用非均匀量化 差分方法上报 CQI信息的,在信道质量较好 /差分 CQI等级较小时的量化粒 度较小, 在信道质量较差 /差分 CQI等级较大时的量化粒度较大, 这样使每 个资源点的 CQI差别信息都有对应的差分 CQI等级, 进而保证本发明实施 例能够向基站上报全频带内所有资源点的差分 CQI等级。 其中, 本发明方 法与装置的第一种实施方式在全面上报时不需要资源位置指示序列, 从而 节省了系统的信令开销。 同时, 该实施方式通过差分 CQI等级反映信道质 量的资源点个数是确定的, 从而保证每次上报的信令长度都是固定的, 进 而简化了信令解码的过程。
另外, 本发明方法与装置的第二种实施方式为了能够准确上报部分资 源点的 CQI信息,在对每个资源点的 CQI差别信息设置差分 CQI等级的基 础上只选取信道质量最佳的若干资源点, 再上报信道质量最佳资源点的差 分 CQI等级和资源位置指示序列。 而对信道质量不好的资源点则釆取求平 均值的方式, 然后再上报所述 CQI信息的平均值。 该实施方式只能准确上 报部分资源点的 CQI信息, 同时也能较好地节省系统的信令开销。
以上对本发明实施例所提供的对信道质量指示进行量化的方法与装置 了阐述, 以上实施例的说明只是用于帮助理解本发明的方法及其核心思想; 同时, 对于本领域的一般技术人员, 依据本发明的思想, 在具体实施方式 及应用范围上均会有改变之处, 综上所述, 本说明书内容不应理解为对本 发明的限制。

Claims

权 利 要 求
1、 一种上 ^艮信道质量指示的方法, 其特征在于, 包括:
从信道带宽上选取一个信道质量指示 CQI作为参考信息;
分别将待上报的资源点的 CQI信息和所述参考信息进行差分调制得到 所述资源点的 CQI差别信息;
才艮据所述资源点的 CQI差别信息和差分 CQI等级 - CQI差别信息对照 表得到该资源点的差分 CQI等级; 所述差分 CQI等级 - CQI差别信息对照 表中, 至少两个差分 CQI等级中包含不同的 CQI差别信息个数;
将所述参考信息和所述资源点的差分 CQI等级上报给基站。
2、如权利要求 1所述的方法,其特征在于,所述待上报的资源点的 CQI 信息为选取的信道质量最佳的资源点的 CQI信息, 该方法还包括: 用资源 位置指示序列对所选取的资源点的位置进行指示;
终端将所述参考信息、 所选取的资源点的差分 CQI等级以及资源位置 指示序列上报给基站。
3、 如权利要求 1或 2所述的方法, 其特征在于, 作为参考信息的 CQI 信息为信道质量最佳资源点的 CQI信息或者若干最佳资源点的 CQI信息的 平均值。
4、 如权利要求 2所述的方法, 其特征在于, 还包括:
对未被选中的资源点的 CQI信息求平均值,并将该平均值上报给基站。
5、 如权利要求 1或 2所述的方法, 其特征在于, 还包括预先建立所述 差分 CQI等级 - CQI差别信息对照表的步骤, 具体包括:
确定差分 CQI等级的个数, 为所确定的各差分 CQI等级设置相应的量 化值;
为所述各差分 CQI等级设置 CQI差别信息的个数, 其中至少两个差分 CQI等级中设置不同的 CQI差别信息个数;
根据所设置的 CQI差别信息的个数在各差分 CQI等级中设置相应数量 的 CQI差别信息得到所述差分 CQI等级 - CQI差别信息对照表。
6、 如权利要求 5所述的方法, 其特征在于,
在量化值越大的差分 CQI等级中设置的 CQI差别信息的个数越多。
7、 如权利要求 5或 6所述的方法, 其特征在于,
在量化值越大的差分 CQI等级中设置的 CQI差别信息值越大。
8、 一种处理信道质量指示的方法, 其特征在于,
基站接收终端上报的参考信息和资源点的差分 CQI等级, 再根据终端 为每个差分 CQI等级设置的 CQI差别信息计算得到该资源点上的 CQI信息。
9、 一种上 ^艮信道质量指示的装置, 其特征在于, 包括:
差分调制单元, 用于对待上报资源点的 CQI信息进行差分调制, 以得 到资源点的 CQI差别信息;
CQI信息处理单元, 才艮据所得到的资源点的 CQI差别信息和差分 CQI 等级 -CQI差别信息对照表确定该资源点的差分 CQI等级;
发送单元, 用于发送所述 CQI信息差分调制釆用的参考信息和所确定 的该资源点的差分 CQI等级给基站。
10、 如权利要求 9所述的装置, 其特征在于,
所述待上报的资源点的 CQI信息为选取的信道质量最佳的资源点的 CQI信息, 该装置还包括:
资源位置指示单元, 釆用资源位置指示序列对所选取的资源点的位置 进行指示;
所述发送单元将所述参考信息、 信道质量最佳资源点的差分 CQI等级 以及资源位置指示序列上报给基站。
11、 如权利要求 9所述的装置, 其特征在于, 还包括:
均值单元, 对未被选中的资源点的 CQI信息求平均值;
所述发送单元将该平均值上报给基站。
12、 如权利要求 9、 10或 11所述的装置, 其特征在于, 作为参考信息 的 CQI信息为信道质量最佳资源点的 CQI信息或者若干最佳资源点的平均 CQI信息。
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