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Downlink retransmission control method for multi-input multi-output high-speed downlink packet access system

A technology of access system and control method, applied in diversity/multi-antenna system, error prevention/detection through diversity reception, error prevention/detection using return channel, etc., can solve the problem of not considering antenna mode switching, throughput performance, etc. Loss and other problems, to achieve the effect of ensuring throughput performance, improving transmission reliability, and increasing the probability of success

Inactive Publication Date: 2009-09-23
ZTE CORP
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Problems solved by technology

Since this method is still multi-stream retransmission in multiplexing mode, that is, if one stream is wrong, other correct streams must be retransmitted, and it does not consider the switching of antenna modes during retransmission when the channel is changed. Therefore, its throughput performance have a large loss

Method used

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  • Downlink retransmission control method for multi-input multi-output high-speed downlink packet access system

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Embodiment Construction

[0025] Combine below figure 1 The present invention is further described.

[0026] After the base station receives the user's error feedback, it will enter the retransmission control process. The user feeds back the receiving status of this stream to the base station through the NACK and ACK flags of a stream in SICH (Shared Information Channel, shared channel information). When the NACK flag is 1 and the ACK flag is 0, the user has received an error for this stream; when When the NACK flag is 0 and the ACK flag is 1, the user has received the stream correctly.

[0027] refer to figure 1 , a retransmission control method for a MIMO HSDPA system, comprising the following steps:

[0028] S101: Determine whether the current working mode of the antenna is diversity mode, if so, go to S102, otherwise, go to S104;

[0029] S102: Determine whether the number of retransmissions of the error stream exceeds the preset threshold of retransmissions. If not, proceed to S103; otherwise,...

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Abstract

The invention discloses a downlink retransmission control method for a multi-input multi-output high-speed downlink packet access system. The control method comprises the following steps: a, judging the working mode of a current antenna and retransmitting cross flow through a single flow if the current antenna is in a diversity mode or entering a next step if the current antenna is in a multiplexmode; and b, maintaining the corresponding relation between the antenna and a multiple flow and retransmitting cross flow and correct flow through the multiple flow when a user feeds back an error ofmulti-flow reception; and adopting a corresponding retransmission mode to retransmit according to the magnitude of a downlink traffic channel sequence fed back by the user when the user feeds back anerror of single-flow reception. The technical proposal of the invention has the advantages of guaranteeing the through-put performance of the system while improving the transmission reliability of the system.

Description

technical field [0001] The present invention relates to a downlink retransmission control method, in particular to a downlink retransmission control method of a MIMO (Multiple Input Multiple Output, Multiple Input Multiple Output) HSDPA (High Speed ​​Downlink Packet Access, High Speed ​​Downlink Packet Access) system. Background technique [0002] MIMO technology has become the preferred technology for HSDPA system in the relevant standards of 3GPP (the 3rd Generation Partner Project, Third Generation Partnership Project). According to the correlation degree of spatial channels, it can be divided into multiplexing (multi-stream) and diversity (single ) in two ways. In an environment with dense multipath and low channel correlation, multi-stream spatial multiplexing is the most effective mode, which can obtain the highest transmission rate; in an environment with high channel correlation, that is, a low rank, the diversity mode is used , the optimal link quality can be obtai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/18H04B7/02H04L1/06
Inventor 秦洪峰周晓东李斌
Owner ZTE CORP
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