Research On The Access Technology Of Umts System For M2M Services

With rapid promotion of the information process, the requirement of ubiquitous communication is becoming more and more apparent, the Internet of Thing (IoT) is introduced under this background with the mission that all things can communicate with each other. As the early form of IoT, Machine-to-Machine (M2M) communication plays an irreplaceable role in the whole development process. The cellular network, with advantages of high efficiency, wide coverage and low cost, has been considered as one of the best choices to carry M2M communication. However, it was designed and optimized for traditional Human-to-Human (H2H) communication. When the M2M is beared on the network, there must be many imcompatible factors. Therefore, it urgently need to study the optimal solution under M2M and H2H coexisting scenarios.The main work in this paper can be described as follows:This dissertation established a general traffic model for M2M communication. Considering the M2M traffic mainly contains small data, the parameter of size in per session was introduced. The model was built from four viewpoints, including connection-level, session-level, packet-level and element-level. Separately, the connection-level included asynchronous and synchronous work. The session level contained the session arrival process, session size and session interval. The packet level comprised of the number of packet calls per session and the interval time of packets calls. The element level contains3attributes, namely, number of datagram per packet call, the interval time of datagram and the size of datagram.The research in this dissertation mainly focus on two application scenarios, smart metering and Electronic Toll Collection (ETC). As for the smart metering scenario, study on the random access mechanism falled into two aspects, including the resource allocation mechanism and power ramping study. From the viewpoint of resource allocation, the dissertation assessed the impact on the H2H performance when M2M bearered to UMTS system. In addition, the resolution proposed in the current research is vertified, simulation results show that the H2H performance of H2H could be significantly improved, and the quality of M2M communication could be assured. In the other side, from the power ramping viewpoint, this dissertation built the analysis model of random access under the M2M and H2H coexisting scenario. And the performance of M2M and H2H was simulated based on the analysis model. The simulation results show that if we treat the M2M service with the same scheme as H2H service, the M2M and H2H communication both couldn’t be assured. Therefore, one power ramping scheme based on the logarithm was proposed for M2M. When the M2M device failed to access the network, the M2M device would increase the transmit power with the logarithm ramping step. The simulation results indicated that the proposed scheme can improve the H2H performance largely, in the mean while, the M2M communication wouldn’t be apparently affected.As for the research on ETC, the traffic model of ETC was built firstly based on the universal M2M traffic model and the performance of ETC and H2H was investaged under the coexisting scenario, which included both single and multiple traffic scenarios. Through the simulation results, it indicated that the ETC can be perfectly beared on the UMTS system with the multiple traffic scenarios.