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Multi-user radio relay method and system

A wireless relay, multi-user technology, applied in wireless communication, advanced technology, electrical components, etc., can solve the problems that relay users cannot receive base station data correctly, do not know the channel conditions between each other, and are difficult to use diversity technology, etc. Achieve the effect of avoiding the increase of the bit error rate, utilizing the diversity gain, and reducing the overhead

Active Publication Date: 2012-01-11
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] 1) In the "Feeding" stage, the relay user may not be able to correctly receive the data sent by the base station, and sending wrong data in the "Delivery" stage will cause the propagation of bit errors and the increase of bit error rate
[0011] 2) In the "Delivery" stage, users do not know the channel situation between each other, and it is difficult to use diversity technology

Method used

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  • Multi-user radio relay method and system
  • Multi-user radio relay method and system
  • Multi-user radio relay method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] When the OFDM modulation method is adopted, the downlink data transmission process from the base station to the user includes the following steps:

[0052] Step 1. In the sending phase, the base station sends the data of the target user to all users with a certain transmission power and transmission rate. Wherein, the modulation method used is OFDM, that is, the data of each target user occupies a part of subcarriers in all subcarriers, and the subcarriers occupied by each user are different.

[0053] Step 2. In the sending phase, all users can receive the data sent by the base station. After receiving the data, the relay user only keeps the data of several target users in its own storage unit. The reserved criterion is that the subcarriers where the data of these users are located have a frequency-selective fading channel whose fading is less than the threshold C 1 .

[0054] Step 3. In the CQI detection stage, the OFDM-modulated signal sent by the data target user ...

Embodiment 2

[0061] When using CDMA to distinguish multiple users, the downlink data transmission process from the base station to the user includes the following steps:

[0062] Step 1', in the sending phase, the base station sends the data of the target user to all users with a certain transmission power and transmission rate. The data between different target users is distinguished by CDMA spreading codes, and each user can use spreading codes with different numbers and lengths according to the different data traffic.

[0063] Step 2', in the sending phase, all users can receive the data sent by the base station. After receiving the data, the relay user only keeps the data of several target users in its own storage unit. The standard of retention is: only retain the data of G users with the best quality at most, and at the same time, the fading experienced by these user data is less than the preset threshold C 1 .

[0064] Step 3', in the CQI detection stage, the target user does not...

Embodiment 3

[0069] Such as Figure 9 As shown, it is a multi-user wireless relay system, including a base station and a user terminal, and the base station is connected to the user terminal; the base station has a downlink data generation unit for generating a detection frame containing channel quality information downlink data; such as Figure 10 As shown, the user terminal includes: a target user data storage unit, which is used to selectively store data of some target users; a target user selection unit, which is used to select users whose channel quality information is greater than a threshold as target users; a transmit diversity unit , use the channel quality information to perform space-time coding on the forwarded data, and use the multiple-input multiple-output multi-antenna technology to send, each relay user randomly selects a branch of space-time coding; the combining unit is used to receive signals from the base station and The data of different relay users is merged.

[0070...

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Abstract

The invention relates to a radio relaying method of multi-user and a system, which adds a detection unit of channel quality information (CQI) in a downlink transmission frame of a base station, including: adding CQI detection frame in the transmission frame and forwarding frame of the downlink transmission frame; a relay user receiving the downlink transmission frame of the base station, and saving data of part of target users according to one of the following standards: the fading of a sub-carrier where the kept data is in a frequency selectively fading channel being less than a threshold; or at most keeping the user data with most quality and set number, and the fading which the data comes through being less than the threshold; or only keeping the user data capable of correctly decoding; during the CQI detection phase corresponding to the CQI detection frame, the relay user receiving pilot signals or spreading codes which don't include the data and are sent by different target users which don't correctly receive the data in the transmission frame, and measuring the CQI between the relay user and the different target users, selecting the target user with the CQI greater than the threshold, and forwarding the data to the selected target user. The invention utilizes the diversity technology to reduce the error propagation and power consumption.

Description

technical field [0001] The present invention relates to the technical field of mobile communication, in particular to a relay-based wireless communication system, specifically a multi-user wireless relay method and system. Background technique [0002] Compared with the third generation mobile communication system, the future (B3G or 4G) mobile communication system must have a qualitative leap in technology and application. In order to meet the basic requirements of high data rate, high real-time and low bit error rate in the future wireless communication system, some new technologies are introduced into the wireless communication system, and wireless relay technology is one of them. [0003] The attenuation of radio signal power is roughly exponential in the distance it travels. In a cellular wireless communication system, the attenuation of radio signals directly determines the coverage of a single cellular grid, that is, a base station. The characteristic of exponential...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W72/04H04W40/22H04W88/04
CPCY02D30/70
Inventor 张霄竞张爱民
Owner HUAWEI TECH CO LTD