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Method for mixing automatic request retransmission

A hybrid automatic and retransmission technology, applied in transmission systems, digital transmission systems, error prevention, etc., can solve problems such as inability to increase or decrease retransmission, and inability to determine correct decoding, reducing the number of retransmissions and ensuring Decoding performance, the effect of improving system performance

Active Publication Date: 2010-06-16
ZTE CORP
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0010] In the existing second type of HARQ scheme, when the incremental redundancy is retransmitted, it is not possible to determine which redundant bits need to be retransmitted in the next retransmission according to the feedback information; and it cannot be based on the current channel quality, adaptive Incremental and decremental retransmissions; that is, when the NodeB knows that the decoding at the receiving end is incorrect, it can only blindly perform incremental retransmissions on the number of redundant bits based on the SNR information fed back by the UE, and cannot determine the retransmission Which redundant bits are sent can make the receiving end decode correctly faster

Method used

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  • Method for mixing automatic request retransmission
  • Method for mixing automatic request retransmission

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Embodiment Construction

[0032] Various preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0033] The method for hybrid automatic retransmission of the present invention, its core idea is: in HSDPA second class HARQ scheme, NodeB side produces a to-be-transmitted sequence mapping table, the to-be-transmitted sequence is mapped according to certain rules according to SNR, SNR( There is a certain relationship between the signal-to-noise ratio) and the BER (bit error rate). The UE receiving end generates feedback confirmation information NACK according to the CRC check result, which means that the current decoding result is wrong and needs to be retransmitted; or ACK, which means that the decoding result is correct and does not need to be retransmitted. Then, according to the decoding information fed back by the UE and the current channel quality, the NodeB adaptively increases or decreases the retransmission of the sequence t...

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Abstract

This invention discloses one mixture automatic re-send method, which comprises the following steps: generating one wait transmission sequence mapping list at Node B end and processing mapping on sequence on signal to noise proportion by certain rules; user device receive end generates feedback identification information according crc test results, wherein, the identification information comprises:expressing codes error then needing re-send; or expressing codes result is right then without re-send; the said Node B is based on the user device feedback codes information and current signal quality.

Description

technical field [0001] The invention relates to a method for automatically requesting retransmission in the field of digital mobile communication, in particular to a hybrid automatic retransmission (HARQ hybrid ARQ) method when TD-CDMA and WCDMA systems provide HSDPA services. Background technique [0002] HSDPA is a modulation and demodulation algorithm proposed by 3GPP in the R5 protocol to meet the asymmetrical requirements of uplink / downlink data services. It is an important technology for improving downlink capacity and data service rate in the later stage of WCDMA and TD-SCDMA network construction. In order to increase the downlink packet data rate and reduce the time delay, HSDPA mainly adopts Adaptive Coding and Modulation (AMC), Fast Hybrid Automatic Repeat (HARQ), Fast Cell Selection (FCS) and fast scheduling technologies. [0003] HARQ technology can improve system performance, and can flexibly adjust the effective coding rate, and can also compensate for bit erro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/18H04L1/00H04J13/00
Inventor 李颖刘虎
Owner ZTE CORP
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