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Method for transmitting and receiving downlink control information based on MIMO (Multiple Input Multiple Output) transmission

A technology for control information, transmission and reception, applied in transmission systems, radio transmission systems, and error prevention/detection through diversity reception, can solve problems such as large signaling overhead, and achieve the effect of reducing signaling overhead and saving bits.

Inactive Publication Date: 2011-10-12
BEIJING SAMSUNG TELECOM R&D CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way of the prior art, this way of indicating the number of layers and the information of the precoding matrix makes DCI need to occupy a large signaling overhead

Method used

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  • Method for transmitting and receiving downlink control information based on MIMO (Multiple Input Multiple Output) transmission
  • Method for transmitting and receiving downlink control information based on MIMO (Multiple Input Multiple Output) transmission
  • Method for transmitting and receiving downlink control information based on MIMO (Multiple Input Multiple Output) transmission

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] If the NDI1 field corresponding to TB1 in the DCI is not used to indicate that TB1 is not activated, but a specific value such as the MCS1 field of TB1 is used to indicate that TB1 is not activated, or the MCS1 field of TB1 is used in combination with NDI and MCS of two TBs Other control information other than bits indicates that TB1 is inactive (the present invention does not limit the method of specifically indicating that TB1 is inactive), then the NDI1 field of TB1 becomes a free bit, which can be used to assist in indicating the number of layers and precoding matrix information of TB0.

[0032] First, a four-antenna UE is described as an example. When the base station schedules the UE to transmit two TBs, a 5-bit precoding information field is required to indicate the 29 possible layers and precoding matrices obtained from the above analysis. Correspondingly, when the UE receives the DCI, if it determines that the base station has scheduled two TBs, it obtains the i...

Embodiment 2

[0047] If the NDI1 field and MCS1 field of TB1 in the DCI are not used to indicate that TB1 is not activated, but use other control information in the DCI except the NDI and MCS fields of the two TBs to indicate that TB1 is not activated, then both the NDI1 field and the MCS1 field of TB1 for free bits. In this way, both NDI1 and MCS1 of TB1 can be used to assist in indicating the layer number and precoding matrix information of TB0. The information indication method of this method is no longer specifically listed. Corresponding to the UE side, when the UE receives the DCI, if it determines that the base station has scheduled a TB, it will jointly obtain the information indicating the number of layers and the precoding matrix of the TB from the NDI1 field, the MCS1 field and the precoding information field. For example, the method of using NDI1 to assist in indicating the information of the number of layers and the precoding matrix described in Embodiment 1 is still applicabl...

Embodiment 3

[0051] If the NDI1 field and MCS1 field of TB1 are occupied at the same time when TB1 is indicated to be inactive, or other control information in the NDI field, MCS field and DCI of TB1 are used at the same time except for the NDI and MCS bits of the two TBs. At this time, although no independent field in the DCI is free, generally speaking, the values ​​of the control information used to indicate that TB1 is not activated can have various combinations. In this embodiment, various combinations of these control information for indicating that TB1 is not activated can be used, and then combined with the precoding information field to indicate the layer number and precoding matrix information of TB0. Specifically, assuming that the number of combinations of the control information used to indicate that TB1 is not activated is N, some or all of these N combinations can be used to assist in indicating the number of layers of TB0 and the information of the precoding matrix.

[0052...

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Abstract

The invention provides a method for transmitting and receiving downlink control information (DCI) based on MIMO (Multiple Input Multiple Output) transmission. When the number of transfer blocks (TB) to be scheduled at present is determined to be two, the number of layers of uplink MIMO transmission and information of a pre-coding matrix are indicated through a pre-coding information domain in the scheduled DCI of the uplink MIMO transmission and the DCI is transmitted; and when the number of the transfer blocks (TB) to be scheduled at present is determined to be one, the number of layers of the uplink MIMO transmission and the information of the pre-coding matrix are indicated through a redundant information domain and the pre-coding information domain in the DCI and the DCI is transmitted. By adopting the method, the bit number of the pre-coding information domain can be saved, and the signaling expenditure of the DCI is reduced.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a method for sending and receiving downlink control information based on MIMO transmission. Background technique [0002] In the Long Term Evolution-Enhanced (LTE-A) system, in order to improve the performance of the uplink, a multiple-input multiple-output (MIMO) technology is used to transmit data. LTE-A is consistent with the LTE system in terms of uplink physical layer transmission technology, and is still based on single carrier frequency division multiplexing (SCFDMA). [0003] In the downlink control information (DCI) for scheduling uplink MIMO transmission, there are two important pieces of information that need to be indicated: the number of layers of uplink MIMO transmission (referred to as the number of layers in the following description) and precoding matrix information. According to the current progress of LTE-A, for a dual-antenna user terminal (UE)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06
CPCH04B7/0617H04B7/0619
Inventor 李迎阳孙程君李小强
Owner BEIJING SAMSUNG TELECOM R&D CENT
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