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

A time-division duplex system and wireless communication technology, applied in the direction of error prevention/detection, transmission system, digital transmission system, etc. using the return channel, can solve problems such as no solution for uplink data or downlink data retransmission

Active Publication Date: 2009-09-16
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 TDD3:5 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 based on time division duplex system in wireless communication and system thereof
  • Uplink/downlink retransmission method based on time division duplex system in wireless communication and system thereof
  • Uplink/downlink retransmission method based on time division duplex system in wireless communication and system thereof

Examples

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Embodiment 1

[0042] First of all, in view of the lack of a retransmission mechanism in the downlink data transmission of the TDD3:5 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 3 downlink physical frames are used for downlink transmission, and the uplink transmission blocks including 5 consecutive uplink physical frames are used for uplink transmission in the TDD mode (ie, TDD3:5 mode).

[0043] 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:

[0044] Step S102, pre-setting the mapping relationship between the uplink physical frame and the downlink physical frame, so that the three downlink physical frames in the d...

example 1

[0057] In a superframe transmission unit, the base station sends downlink data to the terminal through a downlink transmission block composed of three consecutive downlink physical frames. For the convenience of explanation, the positions of these three physical frames are respectively defined as L0, L1, and L2, and the data subpackets sent from these three positions are respectively defined as P0, P1, and P2. The data subpackets in these three different positions can be It can be sent to one terminal, or it can be sent to different terminals. According to the mapping relationship described above, F0 corresponds to R1, F1 corresponds to R2, and F2 corresponds to R3.

[0058] The starting position of the data sub-packet transmission can be in the first downlink transmission block of the superframe, or in the second or third downlink transmission block of the superframe. For the convenience of explanation, it is assumed that the data sub-packet starts from the first Start trans...

Embodiment 2

[0073] According to an embodiment of the present invention, an uplink retransmission method based on a wireless communication TDD system is provided. The above wireless communication TDD system is based on using a downlink transmission block including 3 consecutive downlink physical frames for downlink transmission, and will include 5 consecutive downlink physical frames. The uplink transmission block of an uplink physical frame is used for the TDD mode (TDD3:5 mode) of uplink transmission.

[0074] Such as Figure 4 As shown, the uplink retransmission method according to the embodiment of the present invention includes the following processing:

[0075] Step S402, pre-setting the mapping relationship between the uplink physical frame and the downlink physical frame, so that the three downlink physical frames correspond to one uplink physical frame or two consecutive uplink physical frames respectively. For the convenience of description, we introduce the uplink physical frame...

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Abstract

The invention discloses an uplink / downlink data retransmission method and a system thereof. In the downlink data retransmission method, the mapping relationship between three uplink physical frames of an uplink transmission block and three downlink physical frames of a downlink transmission block is configured in advance; a base station uses the downlink physical frame of the downlink transmission block to send one or a plurality of data sub-packets to one or a plurality of terminals; the terminal demodulates the data sub-packets received; based on demodulation results, the terminal sends a reply message used for indicating whether the data sub-packets are successfully demodulated through the corresponding uplink physical frame among the three uplink physical frames of the uplink transmission block after the downlink transmission block; the base station demodulates the reply message and judges whether the data sub-packets are successfully demodulated according to the reply message; and for the data sub-packets unsuccessfully demodulated, the base station sends the retransmitted data sub-packets through the corresponding downlink physical frame in next downlink transmission block.

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 Applications(China)
IPC IPC(8): H04L1/18H04L12/56
Inventor 辛雨方永刚赵孝武翟义然
Owner ZTE CORP
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