LTE中廣播多播服務(wù)的資源分配算法研究
[Abstract]:With the vigorous development of mobile internet, the proportion of multimedia services in mobile communication services is increasing. Efficient use of multimedia broadcast multicast technology (MBMS) to transmit multimedia services has become a research hotspot. MBMS technology can greatly alleviate the growing demand for resources through wireless resource sharing. The research of S resource allocation algorithm can further improve the resource utilization of multicast system and the user experience of multicast users. LTE MBMS includes single frequency network (MBSFN) and single cell transmission mode, which have different application scenarios. This paper studies the resource allocation algorithm based on single cell mode. Link physical resources and resource allocation framework are studied. The network architecture, channel support, protocol stack, transmission mode and service flow of MBMS in LTE are analyzed. The classical unicast resource allocation algorithms, including single-rate algorithm and multi-rate algorithm, are compared with the classical unicast resource allocation algorithms in LTE. This paper designs a dynamic modulation coding strategy (MCS) selection scheme and a resource allocation algorithm based on Kuhn-Munkres algorithm to overcome the shortcomings of the current single-rate resource allocation algorithm, and designs a priority-based hierarchical multi-rate MBMS resource allocation algorithm PLRA to overcome the shortcomings of the current multi-rate allocation algorithm. The real platform can not meet the simulation requirements, so a system-level simulation platform for MBMS based on Python is designed and implemented. Dynamic MCS selection scheme adjusts the average packet loss rate of each multicast group, which can effectively improve the system throughput under the given packet loss rate threshold. Three single-rate resource allocation algorithms are proposed, including D-BKM, D-IKM and D-MaxKM.D-BKM. Kuhn-Munkres algorithm is used to allocate resource blocks with minimum rate guarantees, and then the maximum throughput principle is used for the second allocation. D-MaxKM algorithm is the inverse of D-BKM algorithm. Firstly, the maximum throughput principle is used to allocate resource blocks, then the redundant resource blocks are searched from the allocated resource blocks, and the Kuhn-Munkres algorithm is used to allocate the redundant resource blocks and the multicast groups which do not meet the minimum rate requirements. The algorithm PLRA is divided into two stages: primary allocation and extended layer allocation. In the primary allocation, multicast groups with fewer resource blocks are satisfied, and fairness factor is introduced to improve the rate fairness when the system capacity is insufficient. In the extended layer allocation, a priority calculation method is designed to give priority to resource blocks allocation. The system-level simulation platform of MBMS based on Python language can be designed and implemented to verify the proposed algorithm in a variety of scenarios, such as system throughput, packet loss rate, rate satisfaction, rate fairness and frequency. Simulation results show that the three algorithms designed in Chapter 3 can improve the system throughput under the condition of guaranteeing the lowest traffic rate. Among the three algorithms, D-MaxKM algorithm has the largest throughput, while D-IKM algorithm can effectively improve the efficiency of D-BKM algorithm by estimating the number of resource blocks and D-MaxKM algorithm has the highest throughput. The performance of IKM algorithm is almost the same as that of D-BKM algorithm. In the fourth chapter, the improved PLRA algorithm can effectively improve the throughput and fairness of Hierarchical Multicast System at the expense of a small amount of spectral efficiency.
【學(xué)位授予單位】:電子科技大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2016
【分類號(hào)】:TN929.5
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