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

A technology of time-division duplex system and wireless communication, which is applied in the direction of using the return channel for error prevention/detection and duplex signal operation. The effect of transmission

Inactive Publication Date: 2013-02-27
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the process of realizing the present invention, the inventors found that in the above-mentioned methods for transmitting uplink or downlink data in the TDD3:1 mode, no retransmission solution for uplink data or downlink data was given, and the data must be correctly completed. The sending and receiving, retransmission mechanism is obviously necessary

Method used

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

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Embodiment 1

[0045] First of all, in view of the lack of a retransmission mechanism in the downlink data transmission of the TDD3:1 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 9 downlink physical frames are used for downlink transmission, and the uplink transmission blocks including 3 consecutive uplink physical frames are used for uplink transmission in a TDD mode (ie, TDD3:1 mode).

[0046] 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:

[0047] Step S102, presetting the mapping relationship between the uplink physical frame and the downlink physical frame group, wherein each downlink physical frame group inclu...

example 1

[0070] In a superframe transmission unit, the base station sends downlink data to the terminal through a downlink transmission block composed of nine consecutive downlink physical frames. Among the nine downlink physical frames, every three consecutive physical frames are set as a group, that is, The 1st, 2nd and 3rd physical frames are set as a group, the 4th, 5th and 6th physical frames are set as a group, and the 7th, 8th and 9th physical frames are set as a group, in order to illustrate For convenience, the positions of these three physical frame groups are respectively defined as L0, L1, and L2, and the data subpackets sent at these three downlink physical frame group positions are respectively defined as P0, P1, and P2, that is, in the downlink transmission block The data subpacket sent by the first physical frame group is defined as P0, and the data subpacket sent by the second physical frame group is defined as P1. Wherein, in this example, the position of the downlink...

Embodiment 2

[0088] According to an embodiment of the present invention, an uplink retransmission method based on a wireless communication TDD system is provided. The wireless communication TDD system is based on using a downlink transmission block including 9 consecutive downlink physical frames for downlink transmission, including 3 consecutive downlink physical frames. The uplink transmission block of an uplink physical frame is used for the TDD mode of uplink transmission.

[0089] Such as Figure 4 As shown, the uplink retransmission method according to the embodiment of the present invention includes the following processing:

[0090] Step S402, presetting the mapping relationship between the uplink physical frame and the downlink physical frame group, wherein each downlink physical frame group includes 3 adjacent downlink physical frames, and one downlink transmission block is equally divided into 3 downlink physical frame groups;

[0091] Step S404, one or more terminals send one ...

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Abstract

The invention discloses upstream and downstream data retransmitting methods and systems, and in the downstream data retransmitting method, a mapping relationship between an upstream physical frame and a downstream physical frame group is preliminarily configured; wherein, each downstream physical frame group comprises three adjacent downstream physical frames, and each downstream transmission block is equally divided into three downstream physical frame groups; a base station sends one or more data sub-packages to one or more terminals by using the downstream physical frame group of the downstream transmission blocks; the terminal demodulates the received data sub-packages of the downstream physical frame group; according to the demodulating result and the mapping relationship, the terminal sends a response message that represents whether the data sub-package demodulation succeeds by using the corresponding upstream physical frame of upstream transmission blocks after the downstream transmission blocks; the base station demodulates the response message and judges whether the data sub-package demodulation succeeds according to the response message, and for the downstream physical frame group with failed data sub-package demodulation, the base station sends a retransmitting data sub-package of the data sub-package with failed demodulation in the next corresponding downstream physical frame group of the downstream transmission blocks.

Description

technical field [0001] The present invention relates to a wireless communication system, in particular to an uplink / 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 ( Fr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/18H04L1/16H04L5/14
Inventor 辛雨
Owner ZTE CORP
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