The Research Of Relay Node Selection On Avoiding Bandwidth Conflicts Of Hidden Node

The development of modern wireless communication technology, gives us a way that more convenient and rapid of obtaining information. However, this way is still less than the rapid growth of information.To invest in information and set up a corresponding network infrastructure are expensive.Therefore, how to reduce the cost of investment of the mobile communication technology and improve the efficiency of the communication at the same time become a hot study problem on the current industry and academia.Cooperative communication as the key technology of 4G networks, it in the network coverage and communication service quality have been improved obviously.In cooperative communication, the selection of relay node have an significant impact on the quality of communication, such as it can produce conflicts of bandwidth and high error rate.Many current research are about point-to-point transmission mode of UNICAST communication, UNICAST cooperative relay node is to select a matching node, and add a auxiliary link transmission information from source node to the destination node.While the point to multipoint transmission mode of multicast communication cooperative, the selection of cooperative relay node is equivalent to choosing less relay nodes as far as possible and increasing the transmission coverage of reliable multicast business information at the same time.Currently the multicast cooperative technology mainly limited in some child nodes of a multicast business and does not take into the bandwidth conflict of hidden node account. When this problem occurs, the performance of multicast services will be substantially reduced.Therefore, this paper studied relay selection to avoid the bandwidth conflict of the hidden nodes in multicast.This paper first introduces the basic situation of the wireless cooperative relay technology, including the channel propagation characteristics, the technology of diversity and merge in relay,and the classification of the wireless cooperative relay and communication technologies are simply described.The third chapter mainly studies how to effectively avoid hidden routing and multicast hidden routing bandwidth conflict, and the relay selection how to avoid bandwidth conflicts of the hidden nodes. Through the remaining bandwidth estimation, constructing the multicast tree that meet the bandwidth, to choose wireless relay nodes to avoid bandwidth conflict.Relay node selection of this chapter considering statistical the channel information of node, it is easier to implement in practice.The fourth chapter is about the improvements of wireless relay node selection based on the bandwidth conflicts, mainly studies the relay cooperation node selection based on bandwidth conflict, and also consider the error rate of relay cooperative nodes that transmit information to the destination.According to the error rate of the relay coordination node selection, to choose the right relay coordination node. The improvement methods of this chapter is a supplement that about the wireless relay node selection based on the bandwidth conflict, did not increase the complexity of the algorithm, but can get good performance.The main results of this paper, proposes a method to avoid bandwidth conflicts of hidden nodes, through the remaining bandwidth estimation, construct multicast tree that meet bandwidth, choose wireless relay nodes to avoid bandwidth conflict. The improvement of wireless relay node selection based on bandwidth conflict studies, comprehensive consideration of the bandwidth of the node and the error rate, improve the overall performance of network. The simulation showed that the contents of this paper improve the performance of cooperation communication, and also improve the communication quality of service network.