High-energy-efficiency wireless relay selection method

Abstract

The invention discloses a high-energy-efficiency wireless relay selection method, which mainly comprises the steps: a bases station or relay stations without user access is / are in a sleep mode; when a user requests to access into a system, the base station selects the relay station with the maximal link energy efficiency U under the condition of meeting the requirement on minimal signal to noise ratio according to channel state information, access user lists of the relay stations, and an access user list of the base station per se, so as to forward information of the user, a working mode is adopted for the base station and the selected relay station, and a relay communication link is established; if the direct transmission energy efficiency U of the base station is maximal, the base station adopting the working mode is used for direct transmission, and a direct communication link is established; and when a user leaves after communication is completed, the base station or the relay stations is / are free from any user access and turn(s) to the sleep mode. The method has the advantages of largely promoting the energy efficiency of a system and greatly reducing the complexity of an algorithm while guaranteeing the quality of service for the user.

Description

Technical field: [0001] The invention belongs to the technical field of resource management of a relay system in a wireless communication system, and specifically relates to a method for selecting a wireless relay with high energy efficiency. Background technique [0002] As the proportion of data services in wireless communication networks continues to increase, the growing data and ubiquitous access requirements lead to a sharp expansion of network infrastructure, which brings huge energy consumption. Limiting power consumption while ensuring the capacity growth of wireless communication networks has become an urgent requirement of mobile operators. Therefore, it is necessary to improve system energy efficiency as much as possible while ensuring service quality, and energy efficiency is mainly related to system throughput and system power consumption. [0003] To date, research on the energy efficiency of wireless networks is usually measured based on output power. Such ...

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Problems solved by technology

However, increasing the capacity also means increasing the power, and the energy efficiency will not necessarily be improved, and the relay selection judgment based on the path loss is simple, but it ignores other influences such as channel shadow fading, so better performance cannot be obtained.

[0006] (2) A relay selection method for reducing transmission power (CN102202382A) has designed a simple relay selection method, which can reduce the system transmission power to a large extent under the prospect of ensuring the interruption probability required by the design, but each A relay station can only forward information for one source node at the same time, which is different from the access situation of the relay station in the cellular network

The distribution of users also has a great impact on the performance of relay selection due to circuit power consumption

Especially in cells with non-uniform distribution, a large number of users are concentrated near some sites (base stations or relay stations), while there are only very few users near some sites. At this time, the existing relay selection scheme will make the system's performance The consumption is greatly increased, but the throughput rate has not been effectively improved

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