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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

Inactive Publication Date: 2009-09-23
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The inventors of the present invention found in the implementation process that in the above-mentioned downlink data transmission methods in the TDD6:2 mode, no solution for retransmission of downlink data was given, but to complete the sending and receiving of data correctly, retransmission The transmission mechanism is obviously necessary

Method used

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

Examples

Experimental program
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Effect test

example 1

[0042] Example 1: The base station uses the second group (second, third physical frame) or third group (fourth, fifth physical frame) of physical frames to send data subpackets

[0043] For the received data subpacket sent through the second and / or third downlink physical frame of the current downlink transmission block, in step S108, the terminal sends a response message in the first physical frame of the first uplink transmission block ; For the received data subpacket sent through the fourth and / or fifth downlink physical frame of the current downlink transmission block, in step S108, the terminal sends a response in the second physical frame of the first uplink transmission block information. That is, after the terminal demodulates the data subpackets at L1 and L2 positions, it sends ACK or NACK messages respectively on the uplink transmission blocks composed of the next two consecutive uplink physical frames, where ACK indicates that the terminal successfully demodulates ...

example 2

[0056] Example 2: The base station uses the first group (first physical frame) physical frame to send data subpackets

[0057]At this time, in step S108, for the received data subpacket sent through the first downlink physical frame of the current downlink transmission block, the terminal sends a response message in the first physical frame of the first uplink transmission block; and, In step S110, for the data subpacket that failed to be demodulated, the base station sends the retransmitted data subpacket of the data subpacket that failed to be demodulated in the corresponding downlink physical frame in the second downlink transmission block, wherein the corresponding downlink physical frame is The position in the second downlink transmission block is consistent with the position in the current downlink transmission block of the downlink physical frame that sends the data subpacket.

[0058] Specifically, for the data subpacket P0 at the L0 position, after demodulating the da...

example 3

[0068] Example 3: The base station uses the fourth group (sixth physical frame) physical frame to send data subpackets

[0069] At this time, in step S108, for the received data subpacket sent through the sixth downlink physical frame of the current downlink transmission block, the terminal transmits the second physical frame of the second uplink transmission block after the current downlink transmission block Send a response message; and, in step S110, for the data sub-packet that fails to be demodulated, the base station sends a retransmission data sub-packet of the data sub-packet that fails to be demodulated in the corresponding downlink physical frame in the second downlink transmission block, wherein , the position of the corresponding downlink physical frame in the second downlink transmission block is the same as the position of the downlink physical frame sending the data subpacket in the current downlink transmission block.

[0070] Specifically, for the data subpack...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/18H04L12/56H04W28/04
Inventor 辛雨方永刚
Owner ZTE CORP
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