Research On Resource Allocation Technologies Of Broadband Satellite Communication System Based On DVB-RCS

With the continuous development of the global latticing and informationization, the ground communication network has already can’t satisfy people’s growing communication needs. It becomes an important technology choices to use satellite communication system to provide broadband multimedia services for fixed and mobile users. In order to get the maximum satisfy users of resource requests, at the same time optimize the bandwidth utilization and network quality of service, it is imperative to adopt efficient radio resource management (RRM) technology. Wireless resource management technology mainly includes the call admission control algorithm, dynamic bandwidth request allocation algorithm and time slots location assignment algorithm, etc.In this thesis, a broadband satellite communication system solution based on DVB-RCS is proposed. And we mainly studied for the system call admission control algorithm and the bandwidth allocation algorithm.The main contents of this thesis are as follows:1. A broadband satellite communications system scheme based on DVB-RCS is given, the scheme adopts MF-TDMA access solution in uplink, and downlink uses Continuous Wave Time Division Multiplexing (CWTDM) method to transmit signals. Also a brief introduction of the international standard protocol DVB-RCS is provided. And the broadband satellite communication system based on DVB-RCS resource management system is introduced.2. In consideration of different types of service in the satellite communication system network, a novel CAC strategy for optimizing the generated revenue from the network system and ensuring the overall QoS is put forward in the thesis, which is suitable for the proposed broadband satellite communication system. Compared with the BNP algorithm, this algorithm obtains a higher system resource utilization, which can reach 95%. When the system load is saturated, and it also reduce the call request rejection rate to a certain extent.3. In view of the facts that the physical channel conditions is not considered to result in low system throughput in the traditional QoS bandwidth allocation algorithm and that the current cross-layer bandwidth allocation algorithm based on utility function has the shortcoming of the low system fairness, a novel cross-layer system dynamic utility bandwidth allocation model taking account of fairness is put forward in this thesis. With the thought of cross-layer design, the model constructs utility function based on application layer of different levels QoS and the conditions of the channel state, by converting the problem into a nonlinear integer programming problems, it realizes the fairness of bandwidth allocation and optimization of utility system. The simulation results show that cross-layer utility fairness algorithm increases the throughput of the system by 21 MPEG-TS packages under the premise of fairness fell by only 0.0006, achieving the tradeoff between the fairness of users and resource utilization.