Method for multiplexing HARQ (Hybrid Automatic Repeat reQuest) processes

A process and logical process technology, applied in the direction of error prevention/detection using return channel, transmission modification based on link quality, network traffic/resource management, etc., to achieve the effect of saving the number of HARQ processes and saving cache space

Active Publication Date: 2018-11-06
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0009] The purpose of the present invention is to solve the problem of adding more HARQ processes and buffer space at the user end due to the introduction of technologies such as carrier aggregation, sTTI, and SC-PTM supporting HARQ feedback retransmission

Method used

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  • Method for multiplexing HARQ (Hybrid Automatic Repeat reQuest) processes
  • Method for multiplexing HARQ (Hybrid Automatic Repeat reQuest) processes
  • Method for multiplexing HARQ (Hybrid Automatic Repeat reQuest) processes

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Embodiment Construction

[0044] The present invention will be further described in detail with reference to the accompanying drawings and embodiments.

[0045] In the existing LTE standard, the base station indicates the HARQ process number and the new data indicator NDI in the DCI. For the same process, NDI is not reversed, indicating that the current transmission is a retransmission of the previous data packet, and the user compares the currently received data with the corresponding The soft bits in the HARQ process are merged; if the NDI flip indicates that the current transmission is a new data packet, the user clears the old soft bits in the corresponding HARQ process and stores the soft bits of the new data packet. In fact, the user only needs to cache soft bits for data that fails to be received, and does not need to receive additional retransmissions for data that is successfully received, that is, does not need to cache corresponding soft bits. For most of the data, the user can successfully ...

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Abstract

The invention provides a method for multiplexing hybrid automatic repeat request (HARQ) processes and belongs to the technical field of mobile communication. According to the method, at a user side, the HARQ processes are divided into physical HARQ processes and logic HARQ processes, and a physical process storage table and a logic process storage table are established. A state of each physical HARQ process, a mapping relationship between the physical HARQ processes and the logic HARQ process, and space addresses for caching soft bits are stored in the physical process storage table. NDIs (NewData Indicators) expected by the user side are stored in the logic process storage table. When downlink transmission receiving of a user is unsuccessful, the available physical processes are selectedfor caching the soft bits, the mapping relationship between the logic processes and the physical processes is recorded, and the expected NDIs of the logic processes are kept unchanged. When the downlink transmission receiving is successful, only the expected NDIs corresponding to the logic HARQ processes are overturned, and the soft bits are not cached. According to the method, the number of theHARQ processes and cache space required by the user side are reduced.

Description

technical field [0001] The invention belongs to the field of mobile communication, and relates to a method for multiplexing a hybrid automatic repeat request (Hybrid Automatic Repeat reQuest, HARQ) process. Background technique [0002] In the LTE (Long Term Evolution, long-term evolution) communication system, starting from Release 8, a multi-process stop-and-wait HARQ transmission protocol is adopted, and 8 parallel HARQ processes are used in the frequency division duplex FDD mode, and in the time division duplex TDD mode , the number of HARQ processes used is related to the ratio of uplink and downlink subframes. The user buffers the soft bits of data in each HARQ process, and combines the soft bits of initial transmission and multiple retransmissions to improve the reliability of reception. In order to ensure that the user end correctly combines the transmission of data packets, the base station uses the same HARQ process to send the initial transmission and retransmiss...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/18H04L1/16H04W28/04H04L1/00
CPCH04L1/0027H04L1/1607H04L1/1812H04L1/1845H04W28/04
Inventor 李勇孙薇淇
Owner BEIJING UNIV OF POSTS & TELECOMM
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