Communication method for broad band time-division duplex system

A technology of time-division duplex system and communication method, which is applied in duplex signal operation, time-division multiplexing usage, transmission system, etc., can solve the problems of spectrum efficiency waste and failure to solve it well, and achieve flexible frequency domain scheduling, The effect of guaranteeing channel symmetry

Active Publication Date: 2010-09-22
SHANGHAI ULTIMATE POWER COMM TECH
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  • Description
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AI Technical Summary

Problems solved by technology

At this time, it is almost impossible to use the same sub-band or sub-carrier for the uplink and downlink channels, unless there is too much redundancy in one direction (uplink or downlink) with a small amount of data, resulting in a waste of overall spectral efficiency
[0021] At present, there is no communication method that can well solve the channel symmetry characteristics of time division duplex in broadband time division duplex system.

Method used

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  • Communication method for broad band time-division duplex system
  • Communication method for broad band time-division duplex system
  • Communication method for broad band time-division duplex system

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Embodiment Construction

[0041] The communication method used in the broadband time division duplex system of the present invention will be described in detail below with reference to the accompanying drawings.

[0042] For broadband time division duplex systems using multi-carrier technology, a real carrier in a traditional time division duplex system is divided into many virtual subcarriers, and the bandwidth of each subcarrier is small. A certain overlap is allowed, so that different users can transmit data on different carriers.

[0043] In order to realize the symmetry of uplink and downlink channels utilizing time division duplex to the greatest extent in the broadband time division duplex system, the present invention discloses a communication method in the above broadband time division duplex system. The implementation of this communication method in different situations will be described in detail below.

[0044] When allocating transmission time and transmission subcarriers to users, the wi...

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Abstract

The invention relates to a communication method for wideband time-division duplex system, wherein said system, based on the stat signal channel condition, sets correlation and relative bandwidth; and the communication method comprises: 1, based on the available resource condition of system, distributes sub band or sub carrier wave for the ascending and descending directions of data transmission of same user; 2, based on the signal channel condition at the ascending / descending direction, in relative bandwidth, obtaining the signal channel condition of sub band or sub carrier wave at the descending / ascending direction of data transmission of said user; 3, at the descending / ascending direction, using obtained signal channel condition to transmit data. The inventive communication method can flexibly distribute frequency domain, and confirm the symmetry of signal channel of ascending and descending transmission of time-division duplex system.

Description

technical field [0001] The invention relates to a wireless communication method, in particular to a communication method of a broadband time division duplex system. Background technique [0002] For the traditional time division duplex (TDD) system, its advantage is that the user uses the same carrier time-division for uplink and downlink transmission, so when the time interval between uplink transmission and downlink transmission is less than the relevant bandwidth of the channel, it can basically It is considered that the channels experienced by the uplink transmission and the downlink transmission are the same, that is, the channel conditions of the uplink transmission and the downlink transmission can be considered to be the same, so that the channel estimation value in one direction can be used to preprocess the transmission in the other direction, Such as beamforming, power control, adaptive modulation and coding, etc. [0003] For broadband time division duplex syste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L5/26H04L5/14H04L29/04H04L69/14
Inventor 王映民索士强孙韶辉
Owner SHANGHAI ULTIMATE POWER COMM TECH
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