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

A time division duplex system, wireless communication technology, applied in wireless communication, error prevention/detection using return channel, electrical components, etc. The effect of retransmission

Inactive Publication Date: 2009-08-05
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 methods for transmitting uplink or downlink data in the TDD2:1 mode, no retransmission solution for uplink data or downlink data is given, and the data must be correctly completed. 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, in view of the lack of a retransmission mechanism in downlink data transmission in the TDD2:1 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 8 downlink physical frames are used for downlink transmission, and the uplink transmission blocks including 4 consecutive uplink physical frames are used for uplink transmission in a TDD mode (that is, TDD2:1 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. like 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 includes 2 adj...

example 1

[0070] In a superframe transmission unit, the base station sends downlink data to the terminal through a downlink transmission block composed of 8 consecutive downlink physical frames. Among the 8 downlink physical frames, every two consecutive physical frames are set as a group, that is, The 1st and 2nd physical frames are set as one group, the 3rd and 4th physical frames are set as a group, the 5th and 6th physical frames are set as a group, and the 7th and 8th physical frames are set as one group, for the convenience of explanation, the positions of these four physical frame groups are respectively defined as L0, L1, L2, and L3, and the data subpackets sent at these four downlink physical frame group positions are respectively defined as P0, P1, P2, P3, that is, the data subpacket sent in the first physical frame group of the downlink transmission block is defined as P0, and the data subpacket sent in the second physical frame group is defined as P1. Wherein, in this exampl...

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 8 consecutive downlink physical frames for downlink transmission, including 4 consecutive downlink physical frames. The uplink transmission block of an uplink physical frame is used for the TDD mode of uplink transmission.

[0089] like 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 2 adjacent downlink physical frames, and one downlink transmission block is equally divided into 4 downlink physical frame groups;

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

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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 two adjacent downstream physical frames, and each downstream transmission blockis equally divided into four 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, global interoperability for microwave access) systems have two duplex modes, namely, FDD (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/18H04W72/04
Inventor 辛雨
Owner ZTE CORP
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