Resource allocation and call admission control for mobile communication systems

Abstract

The radio resource management (RRM) is responsible for the proper utilization of the radio resource in order to guarantee the quality of service (QoS) to the offered services, to maintain the planned coverage area, and to offer high capacity. The scarcity of the radio resource makes the RRM one of the most important engineering issues in wireless and mobile communication systems. Moreover, with the rapid growth of the demand for wireless multimedia services requiring large bandwidth, the RRM in the 3G has more importance to ensure QoS of various services. The RRM in the WCDMA system includes resource allocation, call admission control, power control, handoff control, and packet scheduling functionalities. Among the RRM functionalities, the resource allocation and the call admission control for WCDMA system are investigated in this thesis. We are interested in two special topics. First, dynamic resource allocation for TDD system is considered for two-cell and multi-cell models. Next, call admission control for real time multimedia service with variable bit rate is addressed. First, dynamic resource allocation for WCDMA-TDD system is investigated with two-cell model. The objective of the dynamic resource allocation is twofold. First, we need to satisfy the traffic load in each cell. Secondly, in addition to the traffic load, extra capacity is considered to protect unexpected bearer services in each cell. The extra capacity is allocated in proportion to the required traffic load. The resource allocation is formulated as a mixed integer programming (MIP) problem. Since the MIP problem requires too much computational time, a dynamic resource allocation heuristic algorithm (DRAA) is proposed, which is based on the maximum capacity at each time slot depending on the type of slot in the two cells. Then, the performance of proposed DRAA is compared with the solutions by MIP problem which is solved by CPLEX optimization software. Next, the resource allocation problem in ...