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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 the direction of error prevention/detection, duplex signal operation, etc. using the return channel, which can solve the problem of not giving uplink data or downlink data retransmission solutions, etc.

Inactive Publication Date: 2014-01-01
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 inventor found that, in the above-mentioned methods for transmitting uplink or downlink data in the TDD1:1 mode, no retransmission solution for uplink data or downlink data is given, and the data must be correctly completed. The sending and receiving of the 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

[0041] First, in view of the lack of a retransmission mechanism in TDD1:1 downlink data transmission, an 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 6 consecutive uplink physical frames are used for uplink transmission in a TDD mode (that is, TDD1:1 mode).

[0042] 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:

[0043] Step S102, presetting the mapping relationship between the uplink physical frame and the downlink physical frame;

[0044] Step S104, the base station sends one or more data subpackets t...

example 1

[0065] In a superframe transmission unit, the base station sends downlink data to the terminal through a downlink transmission block composed of six consecutive downlink physical frames. The data subpackets sent at the six downlink physical frame positions are respectively defined as P0, P1, P2, P3, P4, P5, that is, the data subpacket sent in the first physical frame of the downlink transmission block is defined as P0, and the data subpacket sent in the second physical frame is defined as P1. Wherein, in this example, the position of the downlink transmission block for the initial transmission of the data subpacket in the superframe is not limited, and may be the first downlink transmission block or the second downlink transmission block. The boundary of the Superframe has no restriction on the HARQ retransmission processing of the data subpacket.

[0066] Taking sending data subpacket P0 as an example, P0 is sent on the first downlink physical frame F0 shown in FIG. 2( a ). ...

Embodiment 2

[0083] 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 six consecutive downlink physical frames for downlink transmission, including six consecutive downlink physical frames. The uplink transmission block of an uplink physical frame is used for the TDD mode of uplink transmission.

[0084] Such as Figure 4 As shown, the uplink retransmission method according to the embodiment of the present invention includes the following processing:

[0085] Step S402, presetting the mapping relationship between the uplink physical frame and the downlink physical frame;

[0086] Step S404, one or more terminals send one or more data subpackets to the base station using the uplink physical frame of the uplink transport block;

[0087] Step S406, the base station demodulates the received data subpacket ...

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Abstract

The invention discloses a downstream data retransmitting method, which comprises the following steps: a mapping relationship between an upstream physical frame and a downstream physical frame is preliminarily configured; a base station sends one or more data sub-packages to one or more terminals by using the downstream physical frame of downstream transmission blocks; the terminal demodulates the received data sub-packages of the downstream physical frame; 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 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 of the downstream transmission blocks. The invention further provides a downstream data retransmitting system, an upstream data retransmitting method and an upstream data retransmitting system.

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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