关键词: 异构网络, 接入控制算法, 联合呼叫, 马尔科夫链, 服务质量

Abstract: The access strategy of heterogeneous network is closely related to the efficiency of network resource management; meanwhile, the network complexity and the competition of network resources directly affect the customer service quality. Aiming at the problem of high handover dropping rate and high call blocking probability, low resource utilization ratio in heterogeneous network admission control, this paper proposes a joint call admission control algorithm based on Markov chain. This admission control algorithm dynamically sets aside a certain bandwidth resources for handoff call service and real time service, and whether to release bandwidth is determined by bandwidth degradation factors setting according to different services; moreover, according to user preferences and Quality of Service（QoS） requirement of different services, this paper constructs the utility function of call admission control, established and analyzed by using Markov chain. The simulation results show that this algorithm improves the utilization of network resources, reduces the complexity of system, and meets the QoS requirements of various services.

Key words:  heterogeneous network, admission control algorithm, joint call, Markov chain, Quality of Service（QoS）