Research on the Relay and M2M Random Access Technology of LTE-Advanced
|School||Huazhong University of Science and Technology|
|Course||Communication and Information System|
|Keywords||LTE-A Relay M2M Random access|
As one of three candidate 4G technologies LTE is beyond the two other candidate (UMB, WIMAX) gradually been more and more popular, is expected to become the only 4G technology standard. LTE research and writing of standards has ended, the research focus has shifted to subsequent versions of LTE LTE-A. LTE-A as a true 4G technology standard put forward higher requirements on system performance. Relay technology as an expanding cell coverage to address the problem of coverage holes and shadow dead ends, and technical solutions to improve the average system spectral efficiency 3GPP clear support. In addition, LTE is facing the dilemma of technology ahead of market demand, the M2M business undoubtedly break the \Relay technology is introduced in the LTE-A main problem is the problem of changes in the protocol, and how to resolve the interference after introducing a new node. Another overlooked problem is that the deployment of the vast majority Relay Relay program because of cost considerations, can only take care of the relatively large, fading too serious blind spot coverage area, and can not meet the moderate decline of the relatively small area of ??temporary need than the case of the high data rate, the lack of deployment flexibility. On the basis of research on the relay, research a CAN Relay technology program, and the program do not need to add a new Relay node, but the use of phones generally have Bluetooth, WiFi and other wireless interface and distribution of a wide range of features, so better UE channel conditions act as a Relay, and forward data to the UE channel conditions are poor. The program has small changes to existing LTE protocol, low cost, and not to introduce interference, flexible, empty and dead ends the coverage advantages exhaustive simulation results show that the scheme can effectively improve system throughput. The M2M business different from H2H business, with a small amount of communications equipment volume, high burst particularity LTE traditional for H2H random access is directly applied to the M2M business need to study. This article through building simulation platform, LTE access strategy on two M2M business distribution model (uniform distribution Beta distribution access success rate) in a different random access devices the number (5000,10000,30000) preamble collision probability simulation study, simulation results show that to the existing LTE random access strategy can not be a good support burst M2M business.