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Method and system for indicating extra pre-coding matrix index

A precoding matrix and additional technology are applied in the indication method and system field of the precoding matrix index to achieve the effects of easy implementation and performance improvement

Active Publication Date: 2010-07-07
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing technology proposes that the added feedback can be the feedback of BCI or WCI, which entity will make the selection and how to indicate the selected BCI or WCI is an urgent problem to be solved at present.

Method used

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  • Method and system for indicating extra pre-coding matrix index
  • Method and system for indicating extra pre-coding matrix index
  • Method and system for indicating extra pre-coding matrix index

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Such as figure 2 As shown, the additional precoding matrix index type is determined by the UE, which specifically includes the following steps:

[0082] S201, the sending end (ie base station, eNB) sends a pilot to the UE, which is used for the UE to test the downlink channel state;

[0083] S203, the UE estimates the downlink channel according to the received pilot information;

[0084] S205, the UE determines an additional precoding matrix index type, that is, determines whether the uplink channel state control information includes BCI or WCI;

[0085] S207, the UE feeds back uplink channel state control information to the sending end;

[0086] Among them, the channel state control information fed back by the UE includes: including several precoding matrix indicators (PMI), several additional precoding matrix indexes, an indication information for distinguishing BCI or WCI, and several channel quality indication information (CQI);

[0087] The transmitting end lea...

Embodiment 2

[0105] The eNB determines the additional precoding matrix index type, including: the eNB determines the additional precoding matrix index type, carries the indication information for indicating the additional precoding matrix index type in the downlink control information, and sends it to the UE; the UE receives the The received instruction information is used to learn the type of the additional precoding matrix index, and send channel state information including the additional precoding matrix index to the base station.

[0106] Wherein, the channel state information includes: several precoding matrix indicators (PMI), several additional precoding matrix indexes, and several channel quality indication information (CQI). Wherein, the additionally added precoding matrix index can only be one of BCI or WCI, which depends on the indication information in the downlink control information.

[0107] For example, suppose an eNB has N T = 4 transmit antennas, UE also has N R = 4 ant...

Embodiment 3

[0121] The eNB determines the additional precoding matrix index type, and semi-statically configures the UE through the configuration signaling, including: the eNB determines the additional precoding matrix index type, and carries it in the high-level configuration signaling (RRC signaling) to indicate the additional The indication information of the precoding matrix index type is sent to the UE; the UE learns the additional precoding matrix index type according to the received indication information, and sends the channel state information including the additional precoding matrix index to the base station.

[0122] Wherein, the channel state information includes: several precoding matrix indicators (PMI), several additional precoding matrix indexes, and several channel quality indication information (CQI). Wherein, the additionally added precoding matrix index can only be one of BCI or WCI, which depends on the indication information in the higher layer configuration signalin...

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Abstract

The invention discloses a method and a system for indicating an extra pre-coding matrix index. The method comprises the following steps of: determining the type of the extra pre-coding matrix index by using a user equipment (UE) and sending an indication information for indicating the extra pre-coding matrix index in an uplink control information to a base station (eNB), or determining the type of the extra pre-coding matrix index by the eNB and sending the indication information for indicating the extra pre-coding matrix index in a downlink control message or high-level configured signaling to the UE, wherein the type of the extra pre-coding matrix index is the best conjugated pre-coding matrix index (BCI) or the worst conjugated pre-coding matrix index (WCI). The method and the system of the invention not only can promote the performance of multi-user MIMO or multipoint cooperation transmission COMP but also can guide the base station to easily realize the multi-user MIMO or multipoint cooperation transmission COMP.

Description

technical field [0001] The present invention relates to the communication field, and in particular to a method and system for indicating an additional precoding matrix index. Background technique [0002] In the long-term evolution system (LTE: Long Term Evolution), the information reflecting the state of the downlink physical channel (CSI: Channel State Information, that is, channel state information) has three forms: channel quality indication (CQI: Channels quality indication), precoding matrix Indication (PMI: Pre-coding Matrix Indicator), rank indication (RI: Rank Indicator). [0003] CQI is an index to measure the quality of downlink channel. In the 36-213 protocol, the CQI is represented by an integer value from 0 to 15, which represent different CQI levels. Different CQIs correspond to their respective modulation methods and coding rates (MCS). There are 16 cases in total, and 4 can be used. represented by bits of information. [0004] PMI means that only in the t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/06H04B7/04H04W72/12
CPCH04L1/0025H04B7/0413
Inventor 李儒岳徐俊陈艺戬郁光辉戴博张峻峰
Owner ZTE CORP
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