Shi Yan

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Publications (2)0 Total impact

  • Conference Proceeding: Joint admission control through vertical handoffs in heterogeneous wireless networks
    Deng Qiang, Xie Dong-liang, Hu Bo, Shi Yan, Chen Shan-zhi
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    ABSTRACT: This paper considers optimizing the utilization of radio resources in a heterogeneous networks consisting of a WLAN and a CDMA network. We propose a joint admission control mechanism for multimedia traffic that exploits vertical handoff as an effective tool to enhance radio resource management while guaranteeing handoff user's QoS requirements. The network resources utilized by the vertical handoff user are captured by a link utility function. A signaling cost is used to model the signaling and processing load incurred when vertical handoff is performed. The performance of the joint admission control mechanism is analyzed based on the formulation of the admission control actions. Voice and data applications are considered in the performance evaluation, and the simulation results show that the proposed mechanism can efficiently relieve the congestion, balance the load and improve the overall network reward.
    Mobile Congress (GMC), 2010 Global; 11/2010
  • Conference Proceeding: An SMDP-Based Optimal Admission Control Scheme in Cognitive Radio Networks
    Deng Qiang, Hu Bo, Shi Yan, Chen Shan-zhi
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    ABSTRACT: Cognitive radio network is expected to solve the spectrum scarcity by enabling unlicensed secondary users (SUs) to opportunistically utilize the licensed spectrum unused by primary users (PUs). In this paper, we propose an optimal admission control scheme which maximizes the profit while guaranteeing QoS of the PUs. The profit maximization problem is formulated as a Semi-Markov Decision Process (SMDP) and its relevant components are derived. A Linear Programming (LP) algorithm is presented to obtain the optimal admission control policy. QoS provisioning for PUs is also considered by adding constraint to the SMDP formulation. Simulation results show that, the proposed optimal admission control scheme achieves more profit than the Complete Sharing and Threshold-based admission control scheme, and the blocking probability of PUs can be strictly constrained.
    Wireless Communications Networking and Mobile Computing (WiCOM), 2010 6th International Conference on; 10/2010
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