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Method and system for sending periodical channel state information

A technology of channel state information and transmission method, which is applied in the field of communication, and can solve problems such as reduced reliability of decoding on the UE side, lack of basis, and reduced downlink performance of the LTE system, so as to achieve the effect of saving DCI0 overhead and improving effectiveness and reliability

Active Publication Date: 2012-05-09
SANECHIPS TECH CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

Obviously, in this case, if the base station does not adopt some special scheduling strategies, it is impossible to obtain CQI / PMI information, resulting in the lack of important basis for the base station to select the modulation order and precoding matrix, the reliability and effectiveness of downlink transmission The reliability cannot be guaranteed, and the reliability of decoding on the UE side will be reduced, thereby reducing the downlink performance of the entire LTE system
If the base station scheduling strategy is used to solve this problem, the base station must perform frequent DCI0 scheduling, thereby increasing the overhead of downlink signaling

Method used

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  • Method and system for sending periodical channel state information
  • Method and system for sending periodical channel state information
  • Method and system for sending periodical channel state information

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Embodiment Construction

[0036] The channel state information includes CQI / PMI and RI, etc., and the way UE sends the channel state information to the base station is periodic transmission and aperiodic transmission. Here we define the channel state information periodically sent by UE to the base station as periodic Channel state information.

[0037] For the method of periodically sending channel state information, when there is no uplink data to send, the periodic downlink channel state information is sent on the PUCCH; when there is both uplink data and downlink channel feedback information, the uplink data and the periodic downlink channel state Information is sent on PUSCH.

[0038] In the existing protocol, if the periodic channel state information is sent on the PUCCH, the channel coding method adopted is (20, A) channel coding, as shown in the following formula:

[0039] b i = Σ n = ...

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Abstract

The invention discloses a method and a system for sending periodical channel state information. The method comprises two modes of: jointly coding channel quality indicators / precoding matrix indication and order indication, and sending through an uplink physical control channel, or multiplexing the channel quality indicators / precoding matrix indication and order indication on an uplink physical sharing channel to send. The method disclosed by the invention is applied to fully utilize current channel coding resource to joint the channel quality indicators / precoding matrix indication and order indication when the channel quality indicators / precoding matrix indication and order indication are in conflict, so that the base station can timely obtain the downlink channel information, the downlink DCIO expenses can be saved, and the transmission efficiency and the reliability of downlink data can be improved.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method for sending periodic channel state information in an LTE (Long Term Evolution, long term evolution) system. Background technique [0002] In the downlink of the LTE system, the base station sends a pilot signal at a certain time interval, and the UE (user equipment, user equipment) measures the information of the downlink channel according to the pilot signal, including CQI (Channel Quality Indicator, channel quality indication symbol) / PMI (Pre-coding Matrix Indicator, precoding matrix indicator) and RI (Rank Indicator, rank indicator). Then feed back the downlink channel state information to the base station. The base station scheduler performs resource scheduling (resource scheduling) and adaptive modulation and coding (adaptive modulation and coding, AMC) according to the downlink channel state information fed back by the UE, so that the downlink transmission effec...

Claims

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Application Information

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IPC IPC(8): H04W28/04H04L1/00H04L1/06
Inventor 武冠宇安豆娃
Owner SANECHIPS TECH CO LTD
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