Communication method for broad band time-division duplex system

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...

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.

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