Method and system for downlink retransmission based on wireless communication time division duplex system

A technology of time division duplex system and wireless communication, applied in wireless communication, transmission system, digital transmission system and other directions, can solve the problem of not giving downlink data retransmission solution, etc., to achieve the effect of retransmission
CN101540665AInactive Publication Date: 2009-09-23ZTE CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZTE CORP
Publication Date
2009-09-23
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method and a system for retransmitting downlink data. In the method for retransmitting downlink data, a mapping relation between downlink physical frames and uplink physical frames is preset; a base state uses a downlink physical frame of a current downlink transmission block to send one or more data subpackets; a terminal demodulates the received data subpackets of the downlink physical frame; based on the result of the demodulation and the mapping relation, the terminal sends a response message for representing whether the data subpackets are successfully demodulated through a corresponding uplink physical frame in a first uplink transmission block following the current downlink transmission block or a second uplink transmission block following the current downlink transmission block; and the base station demodulates the response message and judges if the data subpackets are successfully demodulated according to the response message, and for the data subpackets that are not demodulated, the base station sends retransmission data subpackets of the data subpackets that are not demodulated through a corresponding downlink physical frame in a first downlink transmission block following the current downlink transmission block or a second downlink transmission block following the current downlink transmission block.
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Description

technical field

[0001] The present invention relates to a wireless communication system, in particular to a downlink retransmission method and system based on a wireless communication time division duplex (Time Division Duplex, TDD for short) system. Background technique

[0002] In a wireless system that transmits data in units of superframes, the up / down link of wireless air interface transmission generally transmits data in units of superframes; each superframe consists of a preamble (preamble) and several PHYs Frame (physical frame); preamble and PHY Frame are composed of OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) Symbol (symbol) as the basic unit.

[0003] The current UMB (Ultra Mobile Broadband, ultra-mobile broadband), LTE (Long-Term Evolution, long-term evolution), Wimax (Worldwide Interoperability for Microwave Access, microwave access global interoperability) systems have two duplex modes, namely, FDD ( Frequency ...

Claims

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