A Relay Cooperative Based Energy Efficiency Optimization Method for Cellular Networks

A technology of energy efficiency and optimization methods, applied in network planning, energy consumption reduction, advanced technology, etc., can solve problems such as performance improvement that is not fully considered

Active Publication Date: 2019-09-03
正链科技(深圳)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The energy efficiency optimization method of relay cooperation for existing cellular networks does not fully consider the performance improvement brought by the retransmission signal of the base station in the second time slot, joint relay selection under optimal energy efficiency, carrier pairing and power allocation, real-time requirements, In order to solve problems such as the practical application of low-complexity algorithms, the present invention proposes a method for optimizing the energy efficiency of cellular networks based on relay cooperation. After comprehensively considering the carrier-power allocation and relay selection to maximize the energy efficiency of the user system, the base station is allowed to The two time slots forward the retransmission information through these idle subcarriers, assisting the low-complexity iterative algorithm, and maximizing the network performance of the user's real-time communication

Method used

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  • A Relay Cooperative Based Energy Efficiency Optimization Method for Cellular Networks
  • A Relay Cooperative Based Energy Efficiency Optimization Method for Cellular Networks
  • A Relay Cooperative Based Energy Efficiency Optimization Method for Cellular Networks

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Embodiment 1

[0099] A method for optimizing energy efficiency of a cellular network based on relay cooperation, comprising the following steps:

[0100] Step 1: Build a system model;

[0101] The present invention is aimed at a special application scene, comes from practical application, and the scene setting is meticulous and reasonable, and has practical guiding significance. The system structure of OFDMA cells with multiple relays and multiple users is as follows: figure 1 As shown, the radius of the cell is set as R, and the cell is approximated as a circle for the convenience of analyzing the problem. The base station is fixed at the center of the circle, and M relays are evenly distributed on the ring with r as the radius (r

Embodiment 2

[0144] On the basis of the first embodiment, the present invention is further improved, in order to reduce the computational complexity, the actual engineering application is used. The solution of the optimization problem P1 in step 3 may adopt a suboptimal method to obtain the power allocation under the direct link, including:

[0145] In this embodiment, with the goal of maximizing energy efficiency, the power p transmitted by the base station to user k through carrier n under the direct link is studied s，k，n (t). It is not difficult to find that formula (6) is a strict Gaussian concave function. Then for user k, the base station transmit power p of each carrier under the direct link s，k，n (t) satisfy:

[0146]

[0147] Then by substituting formula (2) into formula (7) and for p s，k，n (t) derivation can be obtained:

[0148]

[0149] where φ k，n = 1 and u m，n = 0 means that carrier n is allocated to user k and carrier n is sent to user through direct link. From...

Embodiment 3

[0152] On the basis of Embodiment 1 and Embodiment 2, the present invention is further improved, in order to reduce the computational complexity and utilize actual engineering applications. The solution of the optimization problem P1 in step 3 can adopt a suboptimal method to obtain the joint power allocation under the relay link, including:

[0153] Consider the transmit power p of the base station under the relay link s，m.n (t) and relay transmit power p m，k，n The joint power optimal allocation of (t) is a very difficult problem. First, for a trunk link, then u m，n =1. Put formula (6) and formula (7) into formula (9) to get:

[0154]

[0155] In order to obtain formula (4)r in the relay link m，k，n The maximum value of (t), then according to the knowledge of information theory, it can be known that must and equal. Then the rate r at which the relay link download wave n is sent to the user through the relay m m，k，n (t) can be transformed into which is:

[0156...

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Abstract

The invention discloses a cellular network energy efficiency optimization method based on relay cooperation and belongs to the cooperation communication technology field. The method comprises the following steps of establishing a system model; carrying out system scene analysis; carrying out problem resolution; and using a convex optimization method to solve an optimization problem. In the invention, a bit number transmitted per joule under maximized system time average is taken as a utility function, combined relay selection, carrier wave pairing and power distribution problems under an OFDM relay network scene of a plurality of relays and a plurality of users are combinedly considered and a realistic instructive significance is possessed. The method is different from a traditional relay protocol, a base station is allowed to retransmit information of a first time slot through idle subcarriers in a second time slot, emission power of the base station and the relay can be reduced and a system capacity is increased. An algorithm of the invention is designed reasonably and is easy to realize.

Description

technical field [0001] The invention belongs to the technical field of cooperative communication, and more specifically relates to a method for optimizing energy efficiency of a cellular network based on relay cooperation. Background technique [0002] Wireless networking has changed rapidly over the past decade, incorporating many advanced technologies. Among them, the resource allocation problem of the cooperative relay strategy has become a focus of research in the wireless communication academic and industrial circles. At the same time, it is recognized as a major breakthrough in wireless communication because it improves the performance of wireless communication systems by significantly improving the robustness of the system and reducing potential energy loss. There are two transmission methods in the wireless relay cellular communication network: one is the traditional communication transmission method in which the source node directly sends information to the destina...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W16/18H04W40/22
CPCH04W16/18H04W40/22Y02D30/70
Inventor 辛建芳
Owner 正链科技(深圳)有限公司
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