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Method for sending downlink detection reference signal in TDD (time division duplex) system

A technology for sounding reference signals and reference signals, which is applied in the field of sending downlink sounding reference signals, can solve problems such as increasing interference to adjacent cells, and achieve the effects of avoiding interference, facilitating co-frequency networking, and avoiding aliasing

Active Publication Date: 2015-02-11
北京久华信信息技术有限公司
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Problems solved by technology

However, if the pilot signal must be sent, it will inevitably increase the interference to neighboring cells

Method used

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  • Method for sending downlink detection reference signal in TDD (time division duplex) system
  • Method for sending downlink detection reference signal in TDD (time division duplex) system
  • Method for sending downlink detection reference signal in TDD (time division duplex) system

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[0022] The present invention proposes a method for sending downlink sounding reference signals in a TDD MIMO wireless communication system. The main solution is that different base stations use different basic reference signals, and each antenna of the same base station sends mutually orthogonal reference signals to assist the terminal Complete channel quality measurement, and then complete uplink open-loop power control. The technical solutions of the present invention will be further described below in conjunction with specific embodiments.

[0023] First generate the basic set of reference signals:

[0024] Taking a TDD wireless communication system with a system bandwidth of 4MHz, a symbol rate of 3.584MHz, and a base station antenna number N=4 as an example, L=224 and M=222. A ZC (Zadoff–Chu) sequence with a length of 223 is selected to be cyclically extended to a sequence with a length of 224 to form a frequency-domain basic reference sequence with a length of L=224. A...

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Abstract

The invention relates to a method for sending a downlink detection reference signal in a TDD (time division duplex) system. The method comprises the following steps that a basic reference signal set is generated, a base station selects a basic reference signal from the basic reference signal set according to the identity information of the base station, and the reference signal of each antenna is obtained according to the basic reference signal as well as the sending antenna number and the antenna serial number of the base station; a cyclic prefix is added onto the antenna reference signal of each antenna to form the detection reference signal, and in addition, the detection reference signal is sent on the fixing position of each downlink subframe. The orthogonality exists among the reference signals sent by a plurality of antennas, so the aliasing among different antenna signals is avoided. The mutual correlation of the reference signals among different cells is low, and the interference among the downlink detection reference signals of the adjacent cells is reduced. The downlink detection reference signals independent from the data are adopted, the interference caused by data pilot frequency sending at unnecessary time slots and frequency is avoided, and the same-frequency networking is favorably realized.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a method for sending a downlink sounding reference signal in a TDD (Time Division Duplex) MIMO (Multiple Input Multiple Output) system. Background technique [0002] In a mobile communication system, in order to avoid interference between uplink users (UE) caused by the near-far effect, it is necessary to adjust the uplink transmission power of each user according to the channel quality between the user and the base station (BS). Uplink power control methods can be classified into closed-loop power control and open-loop power control. The closed-loop power control refers to the method of adjusting the uplink transmission power according to the quality of the uplink signal received by the base station side, and the open-loop power control refers to the method of adjusting the uplink transmission power of the UE side according to the quality of the downlink signal. In...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/14H04B7/04
Inventor 杨海斌罗明胜高子龙林志坚
Owner 北京久华信信息技术有限公司
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