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Method for feeding back ACK/NACK information

A technology for feedback information and channels, applied in the field of feedback ACK/NACK information, can solve problems such as failure to detect loss

Inactive Publication Date: 2010-03-17
SAMSUNG ELECTRONICS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, DAI cannot detect the loss of the last several PDCCHs

Method used

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  • Method for feeding back ACK/NACK information
  • Method for feeding back ACK/NACK information
  • Method for feeding back ACK/NACK information

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The first mode is used to deal with the following data transmission situation: the user equipment judges that it has received the data in the first downlink subframe sent by the base station, and the index of this subframe is k, but the k+1~ In the N-1 downlink subframes, either the base station does not send data to the user equipment; or the user equipment does not receive the data sent by the base station; or the user equipment receives the data sent by the base station but decodes it incorrectly. Specifically divided into the following three situations. The first situation is that the base station only sends data to the user equipment in one downlink subframe, and the user equipment receives this data. The second case is that the base station sends data for the user equipment in multiple downlink subframes, and the user equipment receives the data in the first downlink subframe sent to it by the base station, and the base station sends data to it in other downlink s...

Embodiment 2

[0077] The first mode is used to deal with the following data transmission situation: the user equipment judges that it has received the data in the first downlink subframe sent by the base station, and the index of this subframe is k, but the k+1~ In the N-1 downlink subframes, either the base station does not send data to the user equipment; or the user equipment does not receive the data sent to it by the base station. Including the following two situations. The first situation is that the base station only sends data for the user equipment in one downlink subframe, and the user equipment receives the data of this downlink subframe. The second case is that the base station sends data for the user equipment in multiple downlink subframes, and the user equipment receives the data in the first downlink subframe sent to it by the base station, and the base station sends data to it in other downlink subframes None of the data was received.

[0078] In this way, in the first mo...

Embodiment 3

[0084] It is assumed here that in the first mode, it is specified that the first subframe in which the base station sends data refers to the first subframe in which the base station sends dynamic data. In LTE TDD, the DAI of the dynamic downlink control channel in this subframe is 0. The following two cases are handled in the second mode, that is, the case where the base station only sends semi-static downlink data; or although the base station sends both dynamic downlink data and semi-static downlink data, the user equipment does not detect the dynamic scheduling control channel, thus From the perspective of the user equipment, currently there is only semi-static downlink data transmission.

[0085] The first mode is used to deal with the following data transmission situations: the user equipment determines that it has received the data in the first dynamic downlink subframe sent to it by the base station, and the index of this subframe is k, and in other downlink subframes ...

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Abstract

The invention relates to a method for feeding back ACK / NACK information. The method comprises the following steps that: when user equipment (UE) correctly receives the data of a first downlink subframe sent by a base station and the ACK / NACK feedback information on other subframes is NACK or DTX, the UE sends the ACK / NACK feedback information on the first subframe, and indicates at the same time that the ACK / NACK feedback information on other subframes is NACK or DTX and records the information as a first mode; and when the UE dost not correctly receive the data of the first downlink subframesent by the base station or the ACK / NACK feedback information on other subframes is ACK, the UE selects a used ACK / NACK channel from a plurality of ACK / NACK channels on the basis of QPSK modulation totransmit the ACK / NACK information on a plurality of downlink subframes and records the information as a second mode. The method utilizes a mechanism for detecting missed data transmission to supporta multi-bit feedback method of ACK / NACK information on multiple subframes, and can be converted into a feedback method for feeding back the ACK / NACK information on a single subframe without confusion.

Description

technical field [0001] The present invention relates to a wireless communication system, and more specifically relates to a method for feeding back ACK / NACK information in the wireless communication system. Background technique [0002] The 3GPP standardization organization is working on the formulation of a new generation wireless communication standard called LTE. The LTE system includes two types of frame structures, frame structure type 1 adopts frequency division duplex (FDD), and frame structure type 2 adopts time division duplex (TDD). [0003] image 3 It is the frame structure of the LTE TDD system. Each length is 307200×T s = The wireless frame of 10ms is equally divided into two lengths of 153600×T s = half frame of 5 ms. Each half frame contains 8 lengths of 15360T s = 0.5ms time slot and 3 special domains, namely downlink pilot time slot (DwPTS), guard interval (GP) and uplink pilot time slot (UpPTS), the sum of the length of these 3 special domains is 3072...

Claims

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Application Information

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IPC IPC(8): H04L1/16H04L1/18
Inventor 李迎阳李小强
Owner SAMSUNG ELECTRONICS CO LTD
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