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Uplink/downlink retransmission method based on wireless communication time division duplexing system

A time-division duplex system and wireless communication technology, which is applied in the direction of error prevention/detection using the return channel, communication between multiple stations, etc., can solve problems such as no solution for uplink data or downlink data retransmission, etc. To achieve the effect of making up for the retransmission mechanism

Active Publication Date: 2009-09-30
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 none of the above-mentioned methods for transmitting uplink or downlink data in the TDD6:2 mode provides a solution for retransmission of uplink data or downlink data, and it is necessary to correctly complete the data transfer. Sending and receiving, retransmission mechanism is obviously necessary

Method used

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  • Uplink/downlink retransmission method based on wireless communication time division duplexing system
  • Uplink/downlink retransmission method based on wireless communication time division duplexing system
  • Uplink/downlink retransmission method based on wireless communication time division duplexing system

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Embodiment 1

[0032] First of all, in view of the lack of a retransmission mechanism in the downlink data transmission of the TDD6:2 mode, the embodiment of the present invention provides a downlink retransmission method based on a wireless communication TDD system. The above wireless communication TDD system is based on a continuous The downlink transmission blocks of 6 downlink physical frames are used for downlink transmission, and the uplink transmission blocks including 2 consecutive uplink physical frames are used for uplink transmission in a TDD mode (ie, TDD6:2 mode).

[0033] figure 1 It is a flowchart of a downlink retransmission method based on a wireless communication TDD system according to an embodiment of the present invention. Such as figure 1 As shown, the method includes the following processing:

[0034] Step S102, preset the mapping relationship between the uplink physical frame and the downlink physical frame, so that the first three downlink physical frames in the down...

Embodiment 2

[0072] Embodiment 2: Delay-sensitive business processing with fast device processing capability

[0073] In this embodiment, after demodulating the data subpackets at L0 and L1 positions, the terminal sends ACK or NACK messages respectively on the uplink transmission block composed of the next two consecutive uplink physical frames. ACK indicates that the terminal has successfully demodulated data, and NACK indicates that the terminal has not successfully demodulated data. The ACK / NACK messages at the two different positions respectively correspond to the data subpackets P0 and P1 at the two different positions of L0 and L1 respectively.

[0074] The base station demodulates the ACK / NACK messages at these two different positions. If it is an ACK message, it means that the terminal successfully demodulates the data, and the base station will place the corresponding physical frame group position on the downlink transmission block composed of the next 6 consecutive downlink physi...

Embodiment 3

[0099] In the superframe transmission unit, a downlink transmission block consists of 6 consecutive downlink physical frames. Among the six downlink physical frames, it is assumed that the second and third physical frames are set as the first physical frame group, and the fourth and fifth physical frames are set as the second physical frame group. For the convenience of explanation, the positions of these two physical frame groups are respectively defined as L0 and L1. The terminal sends uplink data to the base station through an uplink transmission block composed of two consecutive uplink physical frames, and the data subpackets sent from these two uplink physical frames are respectively defined as P0 and P1. The data subpackets of the two different physical frames may be sent to the base station by one terminal, or may be sent to the base station by different terminals. The starting position of the data subpacket transmission can be in the first uplink transmission block of...

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Abstract

The invention discloses an uplink / downlink data retransmission method, wherein a downlink retransmission method comprises the following treatments that: a mapping relationship between uplink physical frames and downlink physical frames is preset so as to make the first three downlink physical frames in a downlink transmission block correspond to a first physical frame in an uplink transmission block and make the last three downlink physical frames in the downlink transmission block correspond to a second physical frame in the uplink transmission block; a base station uses the downlink physical frames in the downlink transmission block to send one or more data sub-packages to one or more terminals; the terminals demodulate the received data sub-packages; based on the demodulation results and according to the preset mapping relationship, the terminals send reply messages in the corresponding uplink physical frames in the uplink transmission block after the downlink transmission block; the base station demodulates the reply messages and judges whether the data sub-packages are successfully demodulated or not according to the reply messages; and regarding the data sub-packages failingto be demodulated, the base station sends the retransmitted data sub-packages in the corresponding downlink physical frames in a subsequent downlink transmission block.

Description

technical field [0001] The present invention relates to a wireless communication system, in particular to an uplink / downlink retransmission method based on a wireless communication 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 Division Duplex, frequenc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26H04L1/16
Inventor 辛雨
Owner ZTE CORP
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