WO2010105486A1 - 一种信道质量指示的反馈方法及系统 - Google Patents

一种信道质量指示的反馈方法及系统 Download PDF

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Publication number
WO2010105486A1
WO2010105486A1 PCT/CN2009/076152 CN2009076152W WO2010105486A1 WO 2010105486 A1 WO2010105486 A1 WO 2010105486A1 CN 2009076152 W CN2009076152 W CN 2009076152W WO 2010105486 A1 WO2010105486 A1 WO 2010105486A1
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Prior art keywords
feedback
cqi
channel
terminal
transmission
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PCT/CN2009/076152
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English (en)
French (fr)
Inventor
孙云锋
姜静
朱常青
张峻峰
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中兴通讯股份有限公司
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Priority to EP09841769.4A priority Critical patent/EP2410696B1/en
Priority to US13/257,790 priority patent/US8787189B2/en
Publication of WO2010105486A1 publication Critical patent/WO2010105486A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/50Network service management, e.g. ensuring proper service fulfilment according to agreements
    • H04L41/5032Generating service level reports
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022Site diversity; Macro-diversity
    • H04B7/024Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity 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
    • H04B7/0615Diversity 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
    • H04B7/0619Diversity 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
    • H04B7/0621Feedback content
    • H04B7/0632Channel quality parameters, e.g. channel quality indicator [CQI]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity 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
    • H04B7/0615Diversity 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
    • H04B7/0619Diversity 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
    • H04B7/0636Feedback format
    • H04B7/0641Differential feedback
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity 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
    • H04B7/0615Diversity 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
    • H04B7/0619Diversity 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
    • H04B7/0636Feedback format
    • H04B7/0645Variable feedback
    • H04B7/065Variable contents, e.g. long-term or short-short
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W24/00Supervisory, monitoring or testing arrangements
    • H04W24/10Scheduling measurement reports ; Arrangements for measurement reports

Definitions

  • the present invention relates to a channel quality indication (CQI) feedback technique, and more particularly to a CQI feedback method and system in a coordinated multi-point transmission and reception (CoMP) system.
  • CQI channel quality indication
  • CoMP coordinated multi-point transmission and reception
  • the line is a frequency division system based on orthogonal frequency division multiplexing (OFDM) based multiple access multiplexing, which is different from the traditional wireless communication system based on code division multiple access (CDMA) based multiple access multiplexing.
  • OFDM orthogonal frequency division multiplexing
  • CDMA code division multiple access
  • FIG. 1 is a schematic diagram of a basic principle of CoMP, and FIG. 1 includes: a base station 21 to a base station 23; a cell 11 where the base station 21 is located, a cell 12 where the base station 22 is located, and a cell 13 where the base station 23 is located; and a terminal (UE) 31 ⁇ UE33;
  • the cell 11, the cell 12, and the cell 13 use CoMP technology to provide cooperative services to the UE 32.
  • the cell entity for measuring and/or reporting the UE includes three aspects.
  • the CRCS is determined by the network centralized, and is notified to the UE by the serving cell.
  • the UE can cooperate.
  • the determination of CRCS is not excluded;
  • CRCS is semi-static configuration.
  • the CATS (Cos Active Transmission Point Set) also includes three aspects.
  • the CATS is determined by the network side and may be different for different UEs.
  • the UE may or may not know the CATS; CATS Whether it is dynamic or semi-static.
  • the control channel for example, the physical layer downlink control channel (PDCCH), the physical layer control format indicator channel (PCFICH, Physical Control Format Indicator Channel) , physical layer automatic hybrid request retransmission indicator channel (PHICH, Physical Hybrid ARQ Indicator Channel), physical layer broadcast channel (PBCH, Physical Broadcast Channel), or primary/secondary synchronization channel (P/SCH, primary/secondary synchronization channel), etc.
  • the control channel only interacts between the UE and the single cell, that is, the primary serving cell. Therefore, when the UE side demodulates the control information carried by the control channel, the corresponding channel quality is only the channel between the UE and the primary serving cell.
  • the control information 1 of the UE1 is sent by the primary serving cell, that is, the cell 1 to the UE1, that is, for the control channel, only the interaction between the primary serving cell and the UE is performed, corresponding to
  • the received signal form is: ⁇ ⁇ + ⁇
  • the control information indicating the control channel indicating the channel quality between the cell 1 and the UE1, indicating the received Noise and interference.
  • the service data in the same subframe, that is, the service data 1, the service data 2, and the service data 3 are jointly transmitted by the UE1, the cell 2, and the cell 3 in the CATS for the UE1, that is, for the service channel. , is to interact with all UEs including the primary serving cell and the UE.
  • the channel characteristic corresponding to the channel characteristics is H 1 ; and for the traffic channel, the corresponding channel characteristic is formed by all cells in the CATS.
  • the main object of the present invention is to provide a CQI feedback method and system, which can not only implement CQI feedback in a CoMP system, but also avoid CQI in control channels and services. The difference in channel feedback.
  • a feedback method for channel quality indication comprising: in a coordinated multi-point transmission CoMP system, a channel quality indicator CQI, or a transmission node corresponding to an integrated channel formed between all transmission nodes and the terminal in a terminal to a CATS The CQI corresponding to the channel between the terminals is fed back.
  • the type of the transmitting node includes a master node; the feedback further includes: the terminal feeding back a CQI corresponding to a channel between the master node and the terminal to the master node;
  • the terminal feeds back the CQI corresponding to the integrated channel to the master node, or the terminal feeds back each CQI corresponding to the channel formed by each non-primary node other than the master node in the CATS to the master node.
  • the CQI level between the CQIs and the CQI corresponding to the integrated channel is different or the same.
  • the method further includes a determining process of the modulation and the encoding, where the determining process of the modulation and the encoding is specifically: corresponding to different feedback modes, the primary node is based on the full bandwidth or the CQI based on different subbands fed back by the terminal.
  • the resource scheduling is performed, and the matching modulation mode and coding mode are selected to modulate and encode the data of the scheduling user.
  • the feedback mode is specifically the feedback mode of the high-level configuration sub-band, or the feedback mode of the sub-band is selected by the terminal, the feedback is further: the terminal adopts a differential mode to perform feedback;
  • the mode of the difference is: different CBIs based on different subbands are differentiated from CQIs based on full bandwidth.
  • the feedback includes: periodic feedback or aperiodic feedback; in the case that the periodic feedback and the aperiodic feedback occur in the same subframe, the terminal is in the sub-frame The frame reports a non-periodic feedback.
  • the method further includes: in the CATS, different transmission nodes adopt the same modulation and coding manner.
  • a feedback system for channel quality indication comprising a feedback unit on the terminal side, and a modulation and coding mode determining unit on the primary node side;
  • the feedback unit is configured to calculate, in a CoMP system, a CQI corresponding to an integrated channel formed between all transmission nodes in the CATS and the terminal, or a CQI corresponding to a channel between the transmission node and the terminal, and perform feedback;
  • the modulation and coding mode determining unit is configured to determine a modulation and coding mode corresponding to the downlink data transmission according to the content fed back by the terminal.
  • the feedback unit is further configured to feed back the CQI corresponding to the channel between the master node and the terminal to the master node; and feed back the CQI corresponding to the integrated channel to the master node, or in the CATS, other than the master node.
  • the respective CQIs of the channels formed between each non-master node and the terminal are respectively fed back to the master node.
  • the difference in CQI in control channel and traffic channel feedback is reduced. Furthermore, the CQI corresponding to the integrated channel formed by the CQI and the CATS in the channel between the primary node and the UE is fed back to the transmission node of the CATS as the primary node, which can be solved on the one hand.
  • FIG. 3 is a schematic diagram of an implementation process of an example of a method according to the present invention.
  • Figure 4 is a schematic view showing the structure of a system of the present invention. detailed description
  • the UE feeds back CQI corresponding to the integrated channel formed between all the transmitting nodes and the UE in the CATS, or each CQI corresponding to the channel between each transmitting node itself and the UE.
  • a feedback method of the CQI includes: in the CoMP system, the UE feeds back CQI corresponding to the integrated channel formed by all the transmitting nodes in the CATS and the UE, or each CQI corresponding to the channel between each transmitting node and the UE.
  • the method further includes: in the CATS, different transmission nodes adopt the same modulation and coding scheme (MCS, Modulation and Coding Scheme) »
  • MCS Modulation and Coding Scheme
  • the types of transport nodes include a primary node and a non-primary node.
  • the integrated CQI can be calculated; after the feedback, the master node can perform resource scheduling based on the acquired integrated CQI, and modulate and encode the traffic channel and the control channel.
  • a CQI feedback method includes the following steps:
  • Step 101 In the CoMP system, calculate a CQI corresponding to the integrated channel formed by all the transmitting nodes in the CATS and the UE.
  • Step 102 The UE feeds back the CQI corresponding to the integrated channel to the master node.
  • Step 103 The primary node performs resource scheduling based on the acquired CQI corresponding to the integrated channel, and modulates and encodes the traffic channel and the control channel.
  • step 102 since the CQI fed back in step 102 is the CQI corresponding to the integrated channel, the difference in the CQI in the control channel and the traffic channel feedback is reduced.
  • the UE currently serving as the CoMP user terminal it is convenient for the UE currently serving as the CoMP user terminal to switch to the non-CoMP transmission mode.
  • the present invention feeds back the CQI of the traffic channel and the CQI for the control channel to the master node respectively, and then proceeds to step 102.
  • the steps include the following three cases.
  • the master node receives the integrated CQI, and uses the correction factor to correct the CQI corresponding to the integrated channel to obtain the corrected CQI, and the modified CQI may be the CQI of the control channel; the UE corresponds to the integrated channel.
  • the CQI is fed back to the master node, and the CQI corresponding to the integrated channel is the CQI of the traffic channel.
  • the UE feeds back the CQI corresponding to the channel between the master node and the UE to the master node, where the CQI is used to indicate the channel quality between the master node and the UE, which may be the CQI of the control channel; the UE transmits all the transmissions in the CATS.
  • the respective CQIs of the channels formed between the non-primary nodes and the terminals are respectively fed back to the master node, and the respective CQIs respectively indicate the channel quality between the non-primary nodes and the UEs other than the master node, and The CQI corresponding to the channel between the master node and the UE reflects the channel quality of the traffic channel.
  • the second and third cases separately feed back the CQI corresponding to the channel between the primary node and the UE.
  • another advantage is that it is beneficial to the UE currently serving as the CoMP user terminal. After switching to the non-cooperative scenario, the master node can obtain the CQI corresponding to the channel between the master node and the UE as soon as possible, especially when the fast cell handover is performed.
  • the process of step 101 is specifically: calculating CQI corresponding to the integrated channel formed between all the transmitting nodes and the UE in the CATS, CQL corresponding to the channel between the primary node and the UE, or each non-node other than the primary node in the CATS before the feedback
  • Each CQI of the channel formed between the master node and the UE may be calculated according to different design methods or transmission modes of the measurement pilot. For the design of the measurement pilot, taking the integrated CQI as an example, when the measurement pilots of the cells in which the respective transmission nodes are located are the same, the synthesized channel information of the integrated channel can be directly measured, and then the existing 3GPP LTE is used.
  • the method defined in 36.213 obtains the CQI corresponding to the integrated channel; when the measurement pilots of the cells in which the transmitting nodes are located are different, for example, orthogonal, respectively, the channels of each transmitting node in the CATS to the UE are estimated, and combined to obtain a synthesized channel.
  • the information, and then the CQI corresponding to the integrated channel is obtained in the manner defined by the existing 3GPP LTE 36.213.
  • the transmission mode may be a transmission mode of the control channel, or a transmission mode of the traffic channel, or may be an integrated channel formed between all the transmission nodes participating in the multi-point coordinated transmission in the CATS and the UE.
  • the transmission mode used in the multipoint coordinated transmission process may be a transmission mode of the control channel, or a transmission mode of the traffic channel, or may be an integrated channel formed between all the transmission nodes participating in the multi-point coordinated transmission in the CATS and the UE. The transmission mode used in the multipoint coordinated transmission process.
  • the integrated channel refers to an equivalent channel (HW + H 2 W 2 + ... + H k W k ) formed between all the participating transmission nodes and the UE in the CATS obtained at the UE side, where the UE When the sender's beam weight and accurate channel information are unknown, it can be estimated by the existing estimation method. At this time, the above formula becomes ( ⁇ + ⁇ 2 ⁇ 3 ⁇ 4 + ⁇ + H k W k ). ⁇ , , H 2 , H 3 ⁇ 4 are different transmission nodes and
  • the feedback in step 102 includes: periodic feedback or aperiodic feedback; in the case that periodic feedback and aperiodic feedback occur in the same subframe, the UE only reports aperiodicity in the subframe. feedback of.
  • the feedback in step 102 is specifically: the UE performs feedback according to different feedback manners; different feedback manners include: a full bandwidth feedback manner, a high layer configuration subband feedback manner, or a UE selection subband feedback manner.
  • the process of the step 103 is specifically: performing modulation and coding after the feedback, corresponding to the different feedback manners, the process of the modulation and coding is specifically: the primary node is based on full bandwidth or based on different subbands according to UE feedback
  • the CQI performs resource scheduling and selects a matching modulation mode and coding mode for modulation and coding.
  • the two types of CQIs are defined by the existing 3GPP LTE 36.213
  • the format is fed back to the master node separately; another special mode is: After the differential mode can be used, the first type of CQI and the second type of CQI reflecting the channel quality of the traffic channel, one of the CQIs, still use the existing 3GPP LTE
  • the format defined by 36.213 is fed back to the master node, and the CQI of the first type and the CQI of the second type of CQI reflecting the channel quality of the traffic channel are differentiated from the CQI and then fed back, especially when this type of CQI is included.
  • CQI-A if the CQI corresponding to the channel between the primary node and the UE is recorded as CQI-A, an integrated channel formed between all the transmitting nodes in the CATS and the UE is used.
  • the corresponding CQI is recorded as CQI-B, and in addition to the CQI- ⁇ and CQI-B can be fed back to the master node respectively using the format defined by the existing 3GPP LTE 36.213, differential mode feedback can also be used, for example, to reduce feedback overhead.
  • CQI-A can be used as a reference to differentiate CQI-B from CQI-A.
  • the CQI-A includes a full bandwidth based CQI
  • the CQI-B and the CQI-A are differentiated based on the full bandwidth, and the CQI-A and the differentiated CQI-B are fed back to the master node
  • the CQI-B includes a full bandwidth based CQI
  • the CQI-A and the CQI-B based on the full bandwidth are differentiated, and the CQI-B and the differentiated CQI-A are fed back to the master node.
  • CQI-A can still be used as a reference, and each CQI and CQI of the channel formed between each non-primary node other than the primary node in the CATS and the UE can be used.
  • -A differential.
  • the CQI-A includes a full-bandwidth-based CQI
  • the CQIs of the respective CQIs and the CQI-As are differentiated, and the CQI-A and the differential CQIs are fed back to the master node.
  • the first embodiment of the method is: a specific implementation process of the first case-first instance.
  • the cell where the primary node is located is called the primary serving cell
  • the cells where other non-primary nodes are located are called non-primary serving cells.
  • Both the primary serving cell and the non-primary serving cell are cooperative cells in the CATS, and both the primary node and the non-primary node are transit nodes in the CATS.
  • the control channel involved in this embodiment includes: PDCCH, PCFICH, PHICH, PBCH, or P/SCH, etc.; the service channel includes: PDSCH, PCH, or DBCH.
  • the UE estimates an integrated channel formed between all coordinated cells participating in joint transmission and the UE in the CATS, calculates a CQI of the integrated channel according to a transmission mode used in the joint transmission process, and performs the CQI according to 3GPP LTE.
  • the mode defined in 36.213 is fed back to the primary serving cell.
  • the primary serving cell obtains the CQI of the control channel by correcting the CQI of the feedback.
  • the correction factor has a value range of 0 ⁇ ⁇ 1 .
  • the feedback of CQI can be periodic feedback or non-periodic feedback.
  • the differential level of differential feedback can be defined by 3GPP LTE 36.213.
  • the CQI deviation level table under the pin demand for example, the differential offset level CQI value table in the case of the 3-bit differential CQI feedback overhead defined in LTE is given in Table 1, and the differential offset level table may be newly defined according to the feedback overhead.
  • the UE separately calculates the channel quality between the primary serving cell and the UE and the integrated channel quality between all the coordinated cells and the UE in the CATS, and calculates corresponding CQI values respectively.
  • the CQI value can be estimated based on the channel estimation result of the measurement pilot of the control channel, and is recorded as CQI-A.
  • the UE may separately estimate the channel of each transmission node to the UE in the CATS, and combine and obtain the synthesized channel information, thereby obtaining the CQI of the integrated channel.
  • the information fed back in CQI-A, CQI-B includes full bandwidth CQI information calculated based on full bandwidth, and may also include CQI information of each subband in part or all of the subbands.
  • the band When selecting a part When the band is used, it may be a sub-band configured when the feedback mode of the high-level sub-band is adopted, or may be adopted.
  • the subband selected when the UE selects the feedback mode of the subband is based on the transmission mode calculation of the control channel.
  • the calculation of CQI-B is based on the transmission mode of the traffic channel.
  • the UE will calculate the obtained two types of CQI information, that is, the CQI of the control channel and the CQI of the service channel, and feed back to the primary serving node.
  • the feedback to CQI-A, CQI-B can be used in two modes.
  • the first one is the normal mode, namely: CQI-A and CQI-B are both in the way defined by 3GPP LTE 36.213, directly CQI-A and CQI-B are fed back to the primary serving cell, respectively.
  • the second is the special mode, which is: Differential mode feedback used to reduce feedback overhead. For differential mode feedback, the following two cases are included.
  • the feedback of CQI-A is fed back in the manner defined in 3GPP LTE 36.213.
  • the CQI-B is differentiated from the CQI-A.
  • the CQI_A of the feedback includes the CQI based on the full bandwidth, it is preferable to differentiate the CQI based on the full bandwidth in the CQI-B and the CQI-A.
  • the formula is:
  • the feedback of CQI-B is fed back in the manner defined in 3GPP LTE 36.213.
  • the calculation formula is:
  • CQI-A differential CQI offset level based on full bandwidth CQI-A index based on full bandwidth - index of CQI-B based on full bandwidth;
  • the CQI values in each of the set ⁇ (3 ⁇ 4/- 2 CQI - K ⁇ are respectively differentiated from the full-bandwidth-based CQI of the primary serving cell to obtain a differential CQI value level at the time of differential feedback.
  • the feedback unit is further configured to: the UE feeds back the CQI corresponding to the channel between the primary node and the UE to the primary node; the UE feeds back the CQI corresponding to the integrated channel to the primary node, or the UE sends each other except the primary node in the CATS.
  • the UE feeds back the CQI corresponding to the channel between the primary node and the UE to the primary node; the UE feeds back the CQI corresponding to the integrated channel to the primary node, or the UE sends each other except the primary node in the CATS.
  • Each of the channels formed between the non-master node itself and the UE CQI, respectively, is fed back to the master node.
  • the feedback unit is further configured to perform feedback according to different feedback manners; the feedback method includes: a full-bandwidth feedback mode, a feedback mode of the high-level configuration sub-band, or a feedback mode of the UE selecting the sub-band for feedback.

Abstract

本发明公开了一种信道质量指示的反馈方法,该方法包括:在多点协作传输(Co MP)系统中,终端对协作传输激活传输节点组中,所有传输节点与终端之间形成的综合信道对应的信道质量指示(CQI)、或传输节点各自与终端之间信道对应的各个 CQI进行反馈。本发明还公开了一种信道质量指示的反馈系统,该系统中,终端侧的反馈单元,用于在 Co MP系统中,计算协作传输激活传输节点组中所有传输节点与终端之间形成的综合信道 对应的 CQI、或传输节点各自与终端之间信道对应的各个 CQI,并进行反馈。采用本发明的方法及系统,不仅能实现 Co MP系统中 CQI的反馈,而且能避免 CQI在控制信道和业务信道反馈时存在的差异性。

Description

一种信道质量指示的反馈方法及系统 技术领域
本发明涉及信道质量指示(CQI )的反馈技术, 尤其涉及一种多点协作 传输 ( CoMP, coordinated multi-point transmission and reception )系统中 CQI 的反馈方法及系统。 背景技术
随着 LTE-A需求的提出, 人们对小区平均频谱效率和小区边缘频谱效 率越来越重视, 相比较而言, 小区边缘的频谱效率最受人们关注, 这主要 是因为 LTE-A系统的上下行都是以正交频分复用 (OFDM ) 为基础多址复 用方式的频分系统, 与传统的以码分多址(CDMA ) 为基础多址复用方式 的无线通信系统不同, LTE-A 系统没有处理增益, 小区内部因为完全频分 正交, 所以几乎没有干扰问题, 但在小区边缘处的干扰处理相对棘手。
为了有效地解决小区边缘的干扰处理问题, 引入了 CoMP技术, CoMP 技术是: 利用多个小区的发射天线协作传输, 来实现小区边缘处无线链路 的较高容量和可靠传输。 如图 1所示为 CoMP的基本原理示意图, 图 1中 包括: 基站 21~基站23; 基站 21所在的小区 11、 基站 22所在的小区 12、 基站 23所在的小区 13; 终端(UE ) 31~ UE33; 图 1中, 小区 11、 小区 12 和小区 13采用 CoMP技术, 对 UE32提供协作服务。
为了明确 CoMP的相关概念,在 3GPP 56次会议上对 CoMP域和 CoMP 的激活集合等相关概念进行了定义。其中, UE进行测量和 /或 4艮告的小区实 体( CRCS , CoMP Reporting Cell Set ) 包括三方面内容, 第一, CRCS由网 络集中确定, 并由服务小区通知给 UE; 第二, UE可以协作 CRCS的确定 不排除; 第三, CRCS为半静态配置。 其中, 真正服务于用户的多点协作传 输激活传输节点组(CATS , CoMP Active Transmission Point Set )也包括三 方面内容, 第一, CATS由网络侧确定, 且对不同的 UE可以不同; 第二, UE可以知道也可以不知道 CATS; CATS是动态配置还是半静态配置。
在 3GPP 55bis会议形成的 CoMP的研究路线中, 由于指出针对控制信 道而言, 比如物理层下行控制信道(PDCCH, Physical Downlink Control Channel ) , 物理层控制格式指示信道(PCFICH , Physical Control Format Indicator Channel ), 物理层自动混合请求重传指示信道( PHICH, Physical Hybrid ARQ Indicator Channel )、物理层广播信道( PBCH, Physical Broadcast Channel )、 或主 /辅同步信道 ( P/SCH , primary/secondary synchronization channel )等控制信道, 仅仅在 UE与单个小区即主服务小区之间进行交互, 因此,在 UE侧解调上述控制信道携带的控制信息时,所对应的信道质量仅 仅是 UE与主服务小区之间的信道质量; 而针对业务信道而言, 比如物理层 下行共享信道( PDSCH, Physical Downlink Share Channel )、寻呼信道( PCH, Paging channel )、 或专用广播信道 ( DBCH, dedicated broadcast channel )等 业务信道, 由于解调上述业务信道承载的业务数据时, 所对应的信道质量 是 CATS中所有小区形成的综合信道质量。 因此, 在 CoMP的反馈时, 需 要考虑控制信道的 CQI反馈与业务信道的 CQI反馈的差异性问题。
如图 2所示为 CoMP的多点联合传输中控制信息与业务数据的传输节 点示意图, 图 2中包括: UE1 ; 基站 1~基站 3; 基站 1所在的小区 1、 基站 2所在的小区 2、 基站 3所在的小区 3 ; 基站 1发射的导频 1、 基站 2发射 的导频 2、 基站 3发射的导频 3 ; 第一权值 wl、 第二权值 w2、 第三权值 w3。 在 CoMP的多点联合传输中, UE1的控制信息 1由主服务小区即小区 1发送给 UE1 , 也就是说, 针对控制信道而言, 仅仅是在主服务小区与 UE 之间进行交互, 对应的接收信号形式为: Υ^ ΗΑ + Ν 其中, 表示控制 信道的控制信息, 表示小区 1与 UE1之间的信道质量, 表示接收到的 噪声和干扰。 而同一子帧内的业务数据即业务数据 1、 业务数据 2和业务数 据 3则由 CATS内的所有小区即小区 1、 小区 2和小区 3共同为 UE1发送, 也就是说, 针对业务信道而言, 是在包括主服务小区在内的所有小区与 UE 之 间 进行 交 互 。 对 应 的 接 收信 号 形 式 可 以 表 示 为 : Yd = (H^ + H2W2 + H3W3 )Sd + N; 其中, 表示业务信道的业务数据, 仍表 示小区 1与 UE1之间的信道质量, ^表示小区 2与 UE1之间的信道质量, 表示小区 3与 UE1之间的信道质量, N表示接收到的综合的噪声和干扰。 综上所述, 一方面, 对于控制信道来说, 从信道特征角度考虑, 其所 对应的信道特性为 H1 ; 而对于业务信道来说,其所对应的信道特性为 CATS 中的所有小区形成的综合信道 (H^ + HUH 另一方面, 从干扰信号 的角度考虑, 对于控制信道来说, 由于控制信道仅仅与主服务小区交互, 在临近小区的相同资源上除了传输与主服务小区之间交互的控制信息之 外, 还会传输其他的控制信息, 因此, 会对与主服务小区之间传输的控制 信息产生干扰; 而对于业务信道来说, 相同资源上传输相同的数据, 可见, 控制信道的干扰信号强度会大于业务信道的干扰信号强度。
综合上述这方面的因素会导致控制信道的信道质量与业务信道的信道 质量会存在较大的差异, 对应的 CQI也会存在较大的差异。 然而, 由于现 有技术中的 CQI反馈并未涉及引入的 CoMP技术, 因此只涉及一个小区为 UE提供的服务, 不存在 CQI反馈的差异性问题。 也就是说, 针对引入的 CoMP技术的 CQI反馈, 目前尚未有解决方案, 更谈不上对引入 CoMP技 术后避免 CQI反馈差异性的解决方案了。 发明内容
有鉴于此, 本发明的主要目的在于提供一种 CQI的反馈方法及系统, 不仅能实现 CoMP系统中 CQI的反馈, 而且能避免 CQI在控制信道和业务 信道反馈时存在的差异性。
为达到上述目的, 本发明的技术方案是这样实现的:
一种信道质量指示的反馈方法, 该方法包括: 在多点协作传输 CoMP 系统中, 终端对 CATS 中, 所有传输节点与所述终端之间形成的综合信道 对应的信道质量指示 CQI、 或传输节点各自与终端之间信道对应的 CQI进 行反馈。
其中, 所述传输节点的类型包括主节点; 所述反馈进一步包括: 所述 终端将主节点与终端之间信道对应的 CQI反馈给主节点;
终端将所述综合信道对应的 CQI反馈给主节点,或者终端将 CATS中, 主节点之外的各个非主节点与终端之间形成的信道对应的各个 CQI, 分别 反馈给主节点。
其中, 所述各个 CQI与所述综合信道对应的 CQI之间, CQI等级为不 同或相同。
其中, 所述反馈具体为: 所述终端根据不同的反馈方式进行反馈; 其中, 所述反馈方式包括: 全带宽的反馈方式、 高层配置子带的反馈 方式或终端选择子带的反馈方式;
所述反馈之后, 该方法还包括调制和编码的确定过程, 所述调制和编 码的确定过程具体为: 对应于不同的反馈方式, 主节点根据终端反馈的基 于全带宽或基于不同子带的 CQI, 进行资源调度, 并选择匹配的调制方式 和编码方式对调度用户的数据进行调制和编码。
其中, 当反馈方式具体为所述高层配置子带的反馈方式、 或所述终端 选择子带的反馈方式时, 所述反馈进一步为: 所述终端采用差分的模式进 行反馈;
其中,所述差分的模式为:将基于不同子带的 CQI与基于全带宽的 CQI 差分。 其中, 所述反馈包括: 周期性的反馈或非周期性的反馈; 在所述周期性的反馈和所述非周期性的反馈, 发生在同一个子帧的情 况下, 所述终端在所述子帧上报非周期性的反馈。
其中, 该方法进一步包括: 所述 CATS 中, 不同传输节点皆采用相同 的调制和编码方式。
一种信道质量指示的反馈系统, 该系统包括终端侧的反馈单元、 和主 节点侧的调制及编码方式确定单元; 其中,
所述反馈单元, 用于在 CoMP系统中, 计算 CATS中所有传输节点与 所述终端之间形成的综合信道对应的 CQI、 或传输节点各自与终端之间信 道对应的各个 CQI, 并进行反馈;
所述调制及编码方式确定单元, 用于根据终端反馈的内容确定下行数 据传输对应的调制和编码方式。
其中,所述反馈单元,进一步用于将主节点与终端之间信道对应的 CQI 反馈给主节点; 以及将所述综合信道对应的 CQI反馈给主节点, 或者将 CATS 中, 主节点之外的各个非主节点自身与终端之间形成的信道的各个 CQI, 分别反馈给主节点。
其中, 所述反馈单元, 进一步用于根据不同的反馈方式进行反馈; 其中, 所述反馈方式包括: 全带宽的反馈方式、 高层配置子带的反馈 方式或终端选择子带的反馈方式进行反馈。
其中, 所述反馈单元, 进一步用于周期性的反馈或非周期性的反馈; 在所述周期性的反馈和所述非周期性的反馈, 发生在同一个子帧的情 况下, 所述终端在所述子帧上报非周期性的反馈。
其中, 所述调制及编码单元, 进一步用于对应于不同的反馈方式, 主 节点根据终端反馈的基于全带宽或基于不同子带的 CQI, 进行资源调度, 并选择匹配的调制方式和编码方式进行调制和编码。 本发明在 CoMP系统中, UE对 CATS中所有传输节点与 UE之间形成 的综合信道对应的 CQI、 或各个传输节点自身与 UE之间信道对应的各个 CQI进行反馈。 由于反馈的 CQI是反映综合信道情况时对应的综合 CQI, 或者反映不同信道情况时对应的各个 CQI, 因此, 降低了 CQI在控制信道 和业务信道反馈时存在的差异性。
采用本发明,降低了 CQI在控制信道和业务信道反馈时存在的差异性。 进而,将主节点与 UE之间信道对应的 CQI和 CATS中所有传输节点与 UE 之间形成的综合信道对应的 CQI, 分别反馈给 CATS 中传输节点类型为主 节点的传输节点,一方面可以解决控制信道和业务信道在 CoMP系统中 CQI 反馈的差异性问题, 同时, 有利于 CoMP用户切换为非 CoMP时, 主节点 能够很快获得主节点与 UE之间干净的信道质量信息。 这样, UE可以分别 获得控制信道与业务信道各自的 CQI反馈, 从而, 在对业务信道和控制信 道的编码和调制时, 业务信道和控制信道可以分别根据各自的 CQI取值选 取合适的编码方式和调制方式, 利于对业务信道和控制信道的编码和调制, 而且有利于适应快速小区选择的场景。 需要指出的是, 本发明中所提到的 UE都指 CoMP系统中的 CoMP用户终端, 为了描述方便, 以下将 CoMP 用户终端筒称为 UE。 附图说明
图 1为 CoMP的基本原理示意图;
图 2为 CoMP的多点联合传输中控制信息与业务数据的传输节点示意 图;
图 3为本发明方法一实例的实现流程示意图;
图 4为本发明系统的组成结构示意图。 具体实施方式
本发明的基本思想是: 在 CoMP系统中, UE对 CATS中所有传输节点 与 UE之间形成的综合信道对应的 CQI、或各个传输节点自身与 UE之间信 道对应的各个 CQI进行反馈。
下面结合附图对技术方案的实施作进一步的详细描述。
一种 CQI的反馈方法包括:在 CoMP系统中, UE对 CATS中所有传输 节点与 UE之间形成的综合信道对应的 CQI、或各个传输节点自身与 UE之 间信道对应的各个 CQI进行反馈。
这里, 该方法进一步包括: 在 CATS 中, 不同传输节点皆采用相同的 调制和编码方案 (MCS, Modulation and Coding Scheme )»
这里, CATS中, 传输节点的类型包括主节点和非主节点。 反馈之前, 可以计算综合的 CQI;反馈之后,可以由主节点基于获取到的该综合的 CQI 进行资源调度, 以及对业务信道和控制信道进行调制和编码。 具体来说, 如图 3所示, 一种 CQI的反馈方法包括以下步骤:
步骤 101、 在 CoMP系统中, 计算 CATS中所有传输节点与 UE之间形 成的综合信道对应的 CQI。
步骤 102、 UE将该综合信道对应的 CQI反馈给主节点。
步骤 103、 主节点基于获取到的该综合信道对应的 CQI进行资源调度, 以及对业务信道和控制信道进行调制和编码。
针对由步骤 101~103构成的技术方案而言,由于步骤 102中反馈的 CQI 是综合信道对应的 CQI, 因此, 降低了 CQI在控制信道和业务信道反馈时 存在的差异性。 但是, 为了在反馈综合信道对应的 CQI的基础上, 更大程 度地降低 CQI在控制信道和业务信道反馈时存在的差异性, 同时便于当前 作为 CoMP用户终端的 UE切换为非 CoMP传输的模式, 本发明将针对业 务信道的 CQI和针对控制信道的 CQI分别反馈给主节点, 则步骤 102进一 步包括以下三种情况。
第一种情况, 主节点接收到该综合的 CQI, 采用修正因子对该综合信 道对应的 CQI修正后获得修正后的 CQI, 该修正后的 CQI可以为控制信道 的 CQI; UE将该综合信道对应的 CQI反馈给主节点, 该综合信道对应的 CQI即为业务信道的 CQI。 第二种情况, UE将主节点与 UE之间信道对应 的 CQI反馈给主节点, 该 CQI用于指示主节点与 UE之间的信道质量, 可 以为控制信道的 CQI; UE将 CATS中所有传输节点与 UE之间形成的综合 信道对应的 CQI反馈给主节点; 该综合信道对应的 CQI用于指示业务信道 的信道质量, 即为业务信道的 CQI。这里,该 CQI与该综合信道对应的 CQI 之间, CQI等级为不同或相同。 第三种情况, UE将主节点与 UE之间信道 对应的 CQI反馈给主节点,该 CQI用于指示主节点与 UE之间的信道质量, 可以为控制信道的 CQI; UE将 CATS中主节点之外的各个非主节点自身与 终端之间形成的信道的各个 CQI, 分别反馈给主节点, 所述各个 CQI分别 指示了主节点以外的其他非主节点与 UE之间的信道质量, 同时与主节点 与 UE之间信道对应的 CQI共同反映了业务信道的信道质量。
需要指出的是,第二和第三种情况都单独反馈了主节点与 UE之间信道 对应的 CQI, 除了降低 CQI反馈的差异性之外, 另外一个好处是有利于当 前作为 CoMP用户终端的 UE切换到非协作场景后, 可以使主节点尽快获 得主节点与 UE之间信道对应的 CQI,尤其是在快速小区切换时好处尤为明 显。
步骤 101 的处理过程具体为: 在反馈之前, 计算 CATS中所有传输节 点与 UE之间形成的综合信道对应的 CQI、 主节点与 UE之间信道对应的 CQL 或 CATS中主节点之外的各个非主节点自身与 UE之间形成的信道的 各个 CQI; 采用的计算方式皆可以为根据测量导频的不同设计方式或传输 方式来计算。 针对测量导频的设计方式而言, 以计算该综合的 CQI为例, 当各传输 节点所在小区的测量导频一样时, 可以直接测量得到综合信道的合成信道 信息,进而沿用现有的 3GPP LTE 36.213定义的方式得到该综合信道对应的 CQI; 当各传输节点所在小区的测量导频不一样时, 比如正交, 则分别估计 CATS中每个传输节点到 UE的信道, 并进行合并得到合成信道信息, 进而 沿用现有的 3GPP LTE 36.213定义的方式得到该综合信道对应的 CQI。针对 传输模式而言, 该传输模式可以是控制信道的传输模式, 也可以是业务信 道的传输模式, 还可以是 CATS中所有参与多点协作传输的传输节点与 UE 之间形成的综合信道, 在多点协作传输过程中采用的传输模式。
其中,所述综合信道是指在 UE侧所获得 CATS中所有参与协作的传输 节点与 UE之间形成的等效信道 (HW + H2W2 +…… + HkWk ) ,其中当 UE未知发 送方的波束权值和准确的信道信息时, 可以通过现有的估计方法估计获得, 此时上式变为(^ + Α2ί¾ + ······ + HkWk ) , Η, , H2 , H¾为不同传输节点与
UE之间的信道信息, 这里的 k表示参与协作的传输节点的个数; 根据综合 信道信息按照现有技术计算信道质量指示信息。
这里, 步骤 102 中的反馈包括: 周期性的反馈或非周期性的反馈; 在 周期性的反馈和非周期性的反馈发生在同一个子帧的情况下, UE在该子帧 仅仅上报非周期性的反馈。
这里, 步骤 102中的反馈具体为: UE根据不同的反馈方式进行反馈; 不同的反馈方式包括: 全带宽的反馈方式、 高层配置子带的反馈方式或 UE 选择子带的反馈方式。 则步骤 103 的处理过程具体为: 在反馈之后进行调 制和编码, 对应于所述不同的反馈方式, 该调制和编码的过程具体为: 主 节点根据 UE反馈的基于全带宽或基于不同子带的 CQI,进行资源调度, 并 选择匹配的调制方式和编码方式进行调制和编码。
其中, 全带宽的反馈方式时, UE根据所采用的传输方式, 根据整个带 宽的信道质量计算 CQI的值; 在高层配置子带的反馈方式时, 由高层指示 UE在哪些子带反馈, 同时 UE除在对应子带上反馈 CQI的值外, 还需要反 馈基于全带宽的 CQI的值; 在 UE选择子带的反馈方式时, UE根据信道情 况, 独立的选择几个最好的或者最差的子带反馈 CQI的值, 这种方式下也 需要基于全带宽的 CQI的值。
而且, 当反馈方式具体为所述高层配置子带的反馈方式、 或所述 UE 选择子带的反馈方式时, 则步骤 102中的反馈进一步为: UE采用差分的模 式进行反馈; 该差分的模式具体为: 将基于不同子带的 CQI与基于全带宽 的 CQI差分。 其中, 基于全带宽的 CQI和基于子带的 CQI的反馈是: 针 对每个码字流进行反馈, 不同子带的 CQI与基于全带宽的 CQI差分时, 与 对应码字流上的基于全带宽的 CQI差分。
具体来说,本发明中,在反馈时,一种普通模式是:可以将第一类 CQI, 即为主节点与 UE之间信道对应的 CQI, 以及第二类 CQI, 即为 CATS中所 有传输节点与 UE之间形成的综合信道对应的 CQI、或者 CATS中主节点之 外的各个非主节点自身与 UE之间形成的信道的各个 CQI, 这两类 CQI沿 用现有的 3GPP LTE 36.213定义的格式分别反馈给主节点;另一种特殊模式 是: 可以采用差分的模式后, 将第一类 CQI和反映业务信道信道质量的第 二类 CQI其中的一类 CQI, 仍沿用现有的 3GPP LTE 36.213定义的格式反 馈给主节点, 将第一类 CQI和反映业务信道信道质量的第二类 CQI其中的 另一类 CQI, 与这一类 CQI差分后反馈, 尤其是当这一类 CQI中包含基于 全带宽的 CQI时, 将第一类 CQI和第二类 CQI中的另一类 CQI, 与这一类 CQI中的基于全带宽的 CQI进行差分后, 反馈给主节点。 采用后者这种特 殊模式, 即采用差分的模式进行反馈, 能大大降低反馈开销。
具体来说, 以上述第二种情况为例,如果将主节点与 UE之间信道对应 的 CQI记作 CQI-A, 将 CATS中所有传输节点与 UE之间形成的综合信道 对应的 CQI记作 CQI-B , 则除了可以将 CQI- Α与 CQI-B沿用现有的 3GPP LTE 36.213定义的格式分别反馈给主节点, 还可以采用差分的模式反馈, 比如, 为了降低反馈开销, 可以将 CQI-A作为参考, 将 CQI-B与 CQI-A差 分。 特别地, 当 CQI-A中包含基于全带宽的 CQI时, 将 CQI-B与 CQI-A 中的基于全带宽的 CQI差分, 将 CQI-A和差分后的 CQI-B反馈给主节点; 优选地, 当 CQI-B中包含基于全带宽的 CQI时, 将 CQI-A与 CQI-B中的 基于全带宽的 CQI差分, 将 CQI-B和差分后的 CQI-A反馈给主节点。 以上 述第三种情况为例,如果采用差分的模式反馈, 可以仍将 CQI-A作为参考, 将 CATS 中主节点之外的各个非主节点自身与 UE之间形成的信道的各个 CQI与 CQI-A差分。 特别地, 当 CQI-A中包含基于全带宽的 CQI时, 将该 各个 CQI与 CQI-A中的基于全带宽的 CQI差分, 将 CQI-A和差分后的各 个 CQI反馈给主节点。
方法实施例一为: 上述第一种情况一实例的具体实现过程。 这里, 主 节点所在的小区称为主服务小区, 其他非主节点所在的小区称为非主服务 小区。 主服务小区和非主服务小区都是 CATS 中的协作小区, 主节点和非 主节点都是 CATS 中的传输节点。 本实施例中涉及的控制信道包括: PDCCH、 PCFICH、 PHICH、 PBCH、或 P/SCH等; 业务信道包括: PDSCH、 PCH或 DBCH等。
在本方法实施例中, UE估计 CATS中所有参与联合传输的协作小区与 UE之间形成的综合信道, 根据联合传输过程中采用的传输模式, 计算综合 信道的 CQI, 并将该 CQI按照 3GPP LTE 36.213定义的模式反馈给主服务 小区。 主服务小区通过修正因子对反馈的 CQI修正获得控制信道的 CQI。 其中修正因子的取值范围为 0< < 1 , 当 CATS中只有一个主节点时, β = Υ。
值得说明的是, CQI 的反馈可以是周期性反馈, 也可以为非周期性反 馈,差分反馈时的差分级别可以采用 3GPP LTE 36.213目前定义各种不同开 销需求下的 CQI偏差级别表格, 例如表 1给出的是 LTE中定义的 3bit差分 CQI反馈开销时的差分偏移级别 CQI取值表, 也可以根据反馈开销新定义 差分偏移级别表。
Figure imgf000014_0002
Figure imgf000014_0001
方法实施例二为: 上述第二种情况一实例的具体实现过程。 这里, 主 节点所在的小区称为主服务小区, 其他非主节点所在的小区称为非主服务 小区。 主服务小区和非主服务小区都是 CATS 中的协作小区, 主节点和非 主节点都是 CATS 中的传输节点。 本实施例中涉及的控制信道包括: PDCCH、 PCFICH、 PHICH、 PBCH、或 P/SCH等; 业务信道包括: PDSCH、 PCH或 DBCH等。
在本方法实施例中, UE分别计算主服务小区与 UE之间的信道质量和 CATS中所有协作小区与 UE之间的综合信道质量, 并分别计算对应的 CQI 值。 当计算主服务小区与 UE之间信道质量时,可以根据控制信道的测量导 频的信道估计结果估计得到 CQI值,记作 CQI-A。 UE在估计综合信道的信 道质量时, 依赖于测量导频的设计方式不同, 可以分别估计 CATS 中每个 传输节点到 UE的信道,并进行合并得到合成的信道信息,进而得到综合信 道的 CQI; 也可以直接测量得到综合信道的合成信道信息, 并进而得到综 合信道的 CQI; 将综合信道的 CQI值记作 CQI-B。 CQI值的计算方式沿用 3GPP LTE 36.213定义的方式计算。
CQI-A, CQI-B中反馈的信息包括基于全带宽计算得到的全带宽的 CQI 信息, 还可以包括部分或全部子带中每个子带的 CQI信息。 当选择部分子 带时, 可以是采用高层配置子带的反馈方式时配置的子带, 也可以是采用
UE选择子带的反馈方式时选择的子带。 优选的, CQI-A的计算基于控制信 道的传输模式计算。 优选的, CQI-B的计算基于业务信道的传输模式计算。
最后 UE将计算获得的两种类型的 CQI信息, 即控制信道的 CQI和业 务信道的 CQI反馈给主服务节点。 在进行反馈时, 对 CQI-A, CQI-B的反 馈, 可以采用两种模式, 第一种是普通模式, 即为: CQI-A和 CQI-B都沿 用 3GPP LTE 36.213定义的方式, 直接将 CQI-A和 CQI-B分别反馈给主服 务小区。 第二种是特殊模式, 即为: 为降低反馈开销, 采用的差分的模式 反馈。 针对差分的模式反馈而言, 包括以下两种情况。
第一种情况, CQI-A的反馈沿用 3GPP LTE 36.213中定义的方式反馈。 将 CQI-B与 CQI-A进行差分, 当反馈的 CQI _ A中包含基于全带宽的 CQI 时, 优选的是将 CQI-B与 CQI-A中的基于全带宽的 CQI差分, 此时的计算 公式为:
基于全带宽的 CQI-B的差分 CQI偏移级别=基于全带宽的 CQI-B的索 引-基于全带宽的 CQI- A的索引;
基于子带的 CQI-B的差分 CQI偏移级别=基于子带的 CQI-B的索引- 基于全带宽的 CQI-A的索引。
第二种情况, CQI-B的反馈沿用 3GPP LTE 36.213中定义的方式反馈。 将 CQI-A与 CQI-B进行差分, 当反馈的 CQI _ B中包含基于全带宽的 CQI 时, 优选的是将 CQI-A与 CQI-B中的基于全带宽的 CQI信息差分, 此时的 计算公式为:
基于全带宽的 CQI-A的差分 CQI偏移级别=基于全带宽的 CQI-A的索 引-基于全带宽的 CQI-B的索引;
基于子带的 CQI-A的差分 CQI偏移级别=基于子带的 CQI-A的索引- 基于全带宽的 CQI-B的索引。 方法实施例三为: 上述第三种情况一实例的具体实现过程。 这里, 主 节点所在的小区称为主服务小区, 其他非主节点所在的小区称为非主服务 小区。 主服务小区和非主服务小区都是 CATS 中的协作小区, 主节点和非 主节点都是 CATS 中的传输节点。 本实施例中涉及的控制信道包括: PDCCH、 PCFICH、 PHICH、 PBCH、或 P/SCH等; 业务信道包括: PDSCH、 PCH或 DBCH等。
在本方法实施例中, UE分别估计 CATS中所有协作小区与 UE之间的 信道质量,并分别匹配对应的 CQI值集合 { (¾/- 1、(¾/ - 2 CQI - K } , ^表示 CATS中传输节点的个数。 其中 CQ/ - 1表示主服务小区与 UE之间的 CQI。
分别将集合 { (¾/- 2 CQI - K } 中, 每个 中的各个 CQI 值与主服务小区的基于全带宽的 CQI进行差分,获得差分反馈时的差分 CQI 值级别。
主服务小区的反馈方式沿用 3GPP LTE 36.213定义的方式进行反馈,其 他非主服务小区将差分结果反馈。
如图 4所示, 一种 CQI的反馈系统, 该系统包括反馈单元和调制及编 码单元。 其中, 反馈单元, 用于在 CoMP系统中, UE对 CATS中所有传输 节点与 UE之间形成的综合信道对应的 CQI、或各个传输节点自身与 UE之 间信道对应的各个 CQI进行反馈; 调制及编码单元, 用于对 UE反馈的内 容进行调制和编码。 反馈单元中还包括计算模块, 用于根据测量导频的不 同设计方式或传输方式来计算该综合信道对应的 CQI、 或各个传输节点自 身与 UE之间信道对应的各个 CQI。
这里, 反馈单元, 进一步用于 UE将主节点与 UE之间信道对应的 CQI 反馈给主节点; UE将所述综合信道对应的 CQI反馈给主节点, 或者 UE将 CATS 中主节点之外的各个非主节点自身与 UE之间形成的信道的各个 CQI, 分别反馈给主节点。
这里, 反馈单元, 进一步用于根据不同的反馈方式进行反馈; 反馈方 式包括: 全带宽的反馈方式、 高层配置子带的反馈方式或 UE选择子带的反 馈方式进行反馈。
调制及编码单元, 进一步用于对应于全带宽的反馈方式、 高层配置子 带的反馈方式、或 UE选择子带的反馈方式这些不同的反馈方式,主节点根 据 UE反馈的基于全带宽或基于不同子带的 CQI,进行资源调度, 并选择匹 配的调制方式和编码方式进行调制和编码。
这里, 反馈单元, 进一步用于周期性的反馈或非周期性的反馈; 在周 期性的反馈和非周期性的反馈发生在同一个子帧的情况下, UE在该子帧上 报非周期性的反馈。
以上所述, 仅为本发明的较佳实施例而已, 并非用于限定本发明的保 护范围。

Claims

权利要求书
1、 一种信道质量指示的反馈方法, 其特征在于, 该方法包括: 在多点 协作传输 CoMP 系统中, 终端对协作传输激活传输节点组中, 所有传输节 点与所述终端之间形成的综合信道对应的信道质量指示 CQI、 或传输节点 各自与终端之间信道对应的各个 CQI进行反馈。
2、 根据权利要求 1所述的方法, 其特征在于, 所述传输节点的类型包 括主节点; 所述反馈进一步包括:
所述终端将主节点与终端之间信道对应的 CQI反馈给主节点; 终端将所述综合信道对应的 CQI反馈给主节点, 或者终端将协作传输 激活传输节点组中, 主节点之外的各个非主节点自身与终端之间形成的信 道的各个 CQI, 分别反馈给主节点。
3、 根据权利要求 2所述的方法, 其特征在于, 所述各个 CQI与所述综 合信道对应的 CQI之间, CQI等级为不同或相同。
4、 根据权利要求 1至 3任一项所述的方法, 其特征在于, 所述反馈具 体为: 所述终端根据不同的反馈方式进行反馈;
其中, 所述反馈方式包括: 全带宽的反馈方式、 高层配置子带的反馈 方式或终端选择子带的反馈方式;
所述反馈之后, 该方法还包括调制和编码的确定过程, 所述调制和编 码的确定过程具体为: 对应于不同的反馈方式, 主节点根据终端反馈的基 于全带宽或基于不同子带的 CQI, 进行资源调度, 并选择匹配的调制方式 和编码方式对调度用户的数据进行调制和编码。
5、 根据权利要求 4所述的方法, 其特征在于, 当反馈方式为所述高层 配置子带的反馈方式、 或所述终端选择子带的反馈方式时, 所述反馈进一 步为: 所述终端采用差分的模式进行反馈;
其中,所述差分的模式为:将基于不同子带的 CQI与基于全带宽的 CQI 差分。
6、 根据权利要求 1至 3任一项所述的方法, 其特征在于, 所述反馈包 括: 周期性的反馈或非周期性的反馈;
在所述周期性的反馈和所述非周期性的反馈, 发生在同一个子帧的情 况下, 所述终端在所述子帧上报非周期性的反馈。
7、 根据权利要求 1所述的方法, 其特征在于, 该方法进一步包括: 所 述协作传输激活传输节点组中, 不同传输节点皆采用相同的调制和编码方 式。
8、 一种信道质量指示的反馈系统, 其特征在于, 该系统包括终端侧的 反馈单元、 和主节点侧的调制及编码方式确定单元; 其中,
所述反馈单元, 用于在 CoMP 系统中, 计算协作传输激活传输节点组 中所有传输节点与所述终端之间形成的综合信道对应的 CQI、 或传输节点 各自与终端之间信道对应的各个 CQI, 并进行反馈;
所述调制及编码方式确定单元, 用于根据终端反馈的内容确定下行数 据传输对应的调制和编码方式。
9、 根据权利要求 8所述的系统, 其特征在于, 所述反馈单元, 进一步 用于将主节点与终端之间信道对应的 CQI反馈给主节点; 以及将所述综合 信道对应的 CQI反馈给主节点, 或者将协作传输激活传输节点组中, 主节 点之外的各个非主节点自身与终端之间形成的信道的各个 CQI, 分别反馈 给主节点。
10、 根据权利要求 8所述的系统, 其特征在于, 所述反馈单元, 进一 步用于根据不同的反馈方式进行反馈;
其中, 所述反馈方式包括: 全带宽的反馈方式、 高层配置子带的反馈 方式或终端选择子带的反馈方式进行反馈。
11、 根据权利要求 8所述的系统, 其特征在于, 所述反馈单元, 进一 步用于周期性的反馈或非周期性的反馈;
在所述周期性的反馈和所述非周期性的反馈, 发生在同一个子帧的情 况下, 在所述子帧上报非周期性的反馈。
12、根据权利要求 10所述的系统,其特征在于,所述调制及编码单元, 进一步用于对应于不同的反馈方式, 根据终端反馈的基于全带宽或基于不 同子带的 CQI, 进行资源调度, 并选择匹配的调制方式和编码方式进行调 制和编码。
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