Relay selection method based on load balancing in cooperation relay network

A load balancing and cooperative relay technology, applied in access restriction, electrical components, wireless communication, etc., can solve problems such as unbalanced user service distribution, and achieve the effect of improving overall performance and simplifying the calculation process.

Inactive Publication Date: 2012-08-15
XIAN UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although it is widely agreed that future relay nodes will be deployed by operators, due to the variability of wireless link quality, the diversity of service QoS requirements, and the unbalanced distribution of user services, it is necessary to select the optimal relay node in a centralized or distributed manner. Relay node for user access and data forwarding

Method used

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  • Relay selection method based on load balancing in cooperation relay network
  • Relay selection method based on load balancing in cooperation relay network
  • Relay selection method based on load balancing in cooperation relay network

Examples

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Embodiment 1

[0037] The present invention is a relay selection method based on load balancing in a cooperative relay network. In the following description, it is assumed that the system adopts OFDMA physical layer technology. Such as figure 1 As shown, it is assumed that the system has M cellular cells, and 6 relay nodes (Relay Node, RN) are uniformly arranged in each cell. The relay node is located at 2 / 3 of the cell radius. The available bandwidth in each cell is B, which is divided into N orthogonal sub-channels. It is assumed that the system is in a working state of flat fading, so that both a mobile user (Mobile User, MS) and a relay node in a cell can obtain complete channel state information (CSI). According to the received base station (Base Station, BS) and the pilot signal strength transmitted by the relay node, the mobile user calculates the CSI from the user to the relay node and from the user to the base station respectively, so as to determine the method of direct transmiss...

Embodiment 2

[0052] The relay selection method based on load balancing in the collaborative relay network is the same as that in Embodiment 1, and the following is combined with the attached image 3 And the specific calculation details the realization of the present invention.

[0053] According to the node selection method based on load balancing proposed by the present invention,

[0054] In the first step, the base station in each cell and the six relay nodes in the cell periodically send pilot signals, where the pilot signal sent by the relay node includes the number of mobile users it serves in the current time slot.

[0055] In the second step, the mobile user who chooses to use two hops to access the base station first calculates the SINR value of the signal received from the base station and the SINR value of the received relay signal according to the strength of the pilot signal received from the base station and the relay node. For user k in the cell, the SINR of the three link...

Embodiment 3

[0080] The relay selection method based on load balancing in the collaborative relay network is the same as that in Embodiment 1-2, see figure 2 , the work of the present invention is briefly described as follows, assuming that mobile user k located in cell i respectively receives pilot signals from relay node 1 to relay node m, and then calculates the two-hop transmission achievable rate of selecting different candidate relay nodes And get the number of service users K of the relay node 1 (t)...K m (t), according to the proposed relay selection method based on load balancing, see figure 2 As shown in the left part of , user k first establishes a candidate relay selection list based on the relay selection function constructed in the fourth step above, and selects relay node 1 as its serving relay node; secondly, combined with user k’s Weighting factor ω k and the scheduling factor α of different relay nodes 1 ...α m , the relay node respectively constructs the user sch...

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Abstract

The invention discloses a relay selection method based on load balancing in a cooperation relay network. The relay selection method based on load balancing adopts distributed two-stage relay selection, wherein mobile users select service relay nodes on the basis of a constructed relay selection function; and the relay nodes are used for scheduling the optimal mobile user reversely and realizing the relay section based on load balancing according to matching selection, thereby achieving the compromise between throughput and user fairness. A weight value omega k and a resource scheduling factor alpha m can be selected in real time in the selection process. According to the invention, a computational process is simplified, and the relay nodes can be fairly selected by the users in a cell. According to the method, channel situations on a physical layer and user situations on an MAC (Medium Access Control) layer are taken into overall consideration, the load in each cell is distributed reasonably, so that the transfer efficiency is improved, the system throughput is strengthened, and the overall performance of the network is improved. The balance between resources and the load can be realized among a plurality of nodes through the relay selection to perform performance optimization on the wireless cooperation network, and thus limited wireless resources can be efficiently utilized. Therefore, the relay selection method is practical.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a relay node selection method in a cooperative relay network, in particular to a load balancing-based relay selection method in a cooperative relay network. In a cooperative relay network, this method can be used to balance the load distribution among multiple relay nodes. Background technique [0002] Cooperative relay technology is considered to be one of the good solutions to achieve the goals of future wireless communication systems because it can achieve higher diversity gain, improve cell edge signal quality, and expand cell coverage area. The cooperative relay node selection method in the future wireless communication system mainly solves the problem of "with whom to cooperate" for the mobile terminal. Although it is widely agreed that future relay nodes will be deployed by operators, due to the variability of wireless link quality, the diversity of service Q...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W48/20
Inventor 江帆卢光跃范九伦
Owner XIAN UNIV OF POSTS & TELECOMM
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