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Cognitive cooperative relay forwarding method and system

A technology of cooperative relay and forwarding method, applied in electrical components, wireless communication, power management and other directions, can solve problems such as affecting communication quality, unstable system state, reducing energy consumption, etc., to achieve reliable transmission, easy implementation, and time complexity low degree of effect

Active Publication Date: 2015-10-28
BEIJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the existing technical schemes assume that relay clusters exist in an aggregated state, which is difficult to satisfy in real applications, and the concept of relay clusters restricts the feasible set range during scheme optimization, making the optimization results not ideal
In addition, the number of relay forwarding hops limited by the relay cluster can achieve better results in theoretical research, but it lacks flexibility in practical applications.
The probability-based relay selection method may lead to unstable system status and affect communication quality when the primary user status switches frequently
In addition, the existing optimization scheme sets a fixed total power consumption upper limit for system transmission, and does not consider the problem that the current smart terminal performance is restricted by the battery power storage capacity
[0007] To sum up, the assumptions about relay clusters in existing technical solutions are quite different from the actual situation. The number of relay forwarding hops is determined by the distribution of relay clusters, which cannot be dynamically adjusted according to communication needs, and has no function of reducing energy consumption.

Method used

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  • Cognitive cooperative relay forwarding method and system
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  • Cognitive cooperative relay forwarding method and system

Examples

Experimental program
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Embodiment 1

[0055] A cognitive cooperative relay forwarding method mainly includes the following steps:

[0056] S1. Set the number of relay transfer hops N; the initially set relay transfer hop N should not be too large;

[0057] S2. The minimum signal-to-noise ratio required for transmission is used as the performance index to measure the transmission quality. Under the constraint of the minimum end-to-end signal-to-noise ratio threshold, the minimum transmission power consumption of each hop is a purely increasing function of the transmission distance of this hop , then according to Jason's inequality, the relay nodes corresponding to the minimum power consumption transmission scheme should have the characteristics of being evenly distributed between the source node S and the destination node D, so that a simple and practical optional forwarding hop number can be obtained Relay selection method: according to the relay transfer hop N, carry out relay selection based on Jason's inequalit...

Embodiment 2

[0081] A cognitive cooperative relay and forwarding system that implements the method in the first embodiment above, such as figure 1 As shown in , it includes at least three cognitive terminals and a control center that interacts with them; the control center includes a cognitive database, a relay selection module, and a power allocation module; the relay selection module and the power allocation module are based on the end-to-end communication performance It is required to generate an optimal relay forwarding scheme with the minimum number of forwarding hops;

[0082] The cognition database is the information center of the system, responsible for receiving and summarizing the environment cognition information sent by the cognition terminal and the feedback information of the relay selection module and the power allocation module; Assignment modules, etc. provide information required for processing;

[0083] The relay selection module, according to the information in the cog...

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Abstract

The present invention relates to the technical field of wireless network communication, and specifically relates to a method and system for cognitive cooperative relaying. The method for cognitive cooperative relaying comprises the steps of: S1. setting the number of relay hops; S2. performing a Jensen's inequality-based relay selection on the basis of the number of relay hops; and, S3. combining the results of the relay selection, performing a convex optimization theory-based power distribution. The present invention allows the relay selection and power distribution to be performed in a natural state, is a cooperative relaying / forwarding method of minimal energy consumption that satisfies a certain signal-to-interference-plus-noise ratio condition, and is capable of implementing reliable transmission of optimal cognitive cooperative relay, while at the same time, the present invention has a low time complexity and is easy to implement.

Description

technical field [0001] The present invention relates to the technical field of cognitive wireless network communication, in particular to a cognitive cooperative relay forwarding method and system. Background technique [0002] With the development of wireless communication systems, especially the widespread popularization of smart terminals such as Android phones and tablet PCs, users' demands for high-speed network quality and diversified application services have entered a stage of rapid growth. Spectrum utilization and energy consumption put forward new requirements, which makes the scarcity of spectrum resources increasingly obvious, the allocation of available spectrum resources is exhausted, and at the same time, the use efficiency of some authorized spectrum is low; energy consumption has now become a constraint on the portability of mobile terminals How to achieve reliable communication with certain quality requirements with lower energy consumption is also one of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W40/22H04W52/46
CPCH04W52/46
Inventor 冯志勇张平马思思张奇勋贺倩尉志青刘建伟王璁刘晓敏
Owner BEIJING UNIV OF POSTS & TELECOMM