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Method for blind relay selection based on random access in large-scale relay network

A relay network and random access technology, which is applied in the field of wireless communication, can solve the problem that it is difficult for users to collect relay real-time information, and achieve the effect of alleviating the trouble of high complexity, sub-optimal performance, and reducing information requirements.

Active Publication Date: 2015-01-28
XIDIAN UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that users are difficult to collect relay real-time information due to its large-scale and blind node characteristics in a large-scale relay network, and propose a blind relay selection method based on random access to reduce a large number of High collision probability due to competition between relays, meeting the requirements of multi-hop scenarios

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  • Method for blind relay selection based on random access in large-scale relay network
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  • Method for blind relay selection based on random access in large-scale relay network

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Embodiment Construction

[0029] The technical method of the present invention will be described in further detail below with reference to the accompanying drawings.

[0030] refer to figure 1 , the model contains a source node S, a target node D, and a density of λ r uniformly distributed relays. There is no base station set up in the network to broadcast or collect various information relayed. In addition, due to the large-scale nature of the network, the relays do not share the information they have with each other, and each relay only has its own local information. Due to the scarcity of spectrum resources in a large-scale network, this model confines all network activities related to one user to one channel. Assume that the channel quality of the direct link between the source node and the destination node is very poor, so they must rely on the relay for successful transmission work. And the target node is fixed, but both the source node and the relay can change their positions from frame to f...

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Abstract

The invention discloses a method for blind relay selection based on random access in a large-scale relay network. The method mainly solves the problems that in the prior art, under the conditions of lacking and even having no relay information, a high-performance relay cannot be selected quickly, and the achieving complexity is high. The technical scheme is that a source node broadcasts user need information to a relay node; the relay node begins to detect whether the relay node can meet the user need information; if the relay node can meet the user need information, a piece of response information is sent to the source node, or else the relay keeps silent; the source node uses an energy detector to recognize available relays; the available relay randomly selects an available relay for the source node by using a time slot ALOHA mode; and the source node transmits data information through the selected available relay. The method can alleviate network expenses, reduce the information requirements for the relay, and can be used for the large-scale relay network which is provided with plenty of non-characteristic relays and lacks relay information collecting means.

Description

technical field [0001] The invention belongs to the field of wireless communication, and particularly relates to a blind relay selection method, which is suitable for a large-scale relay network with a large number of non-specific relays and lack of means for collecting relay information. Background technique [0002] Cooperative relay technology is an emerging technology that applies cooperative relays to wireless networks. It can provide reliable data transmission services for users with poor channel environments, improve the transmission rate and reliability of wireless channels, increase the coverage of the system and the robustness of the system, and not only reduce the complexity of the system without increasing the complexity of the system. The power consumption and bandwidth of the terminal are improved, and the spectral efficiency, throughput and capacity of the system can be significantly improved. There is currently a lot of related work studying relay selection....

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Application Information

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IPC IPC(8): H04W40/22
CPCH04W40/22Y02D30/70
Inventor 宫丰奎欧阳逢辰张军山王勇葛建华
Owner XIDIAN UNIV
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