Showing papers by "Yeong Min Jang published in 2005"
21 Sep 2005
TL;DR: Simulation results show that the proposed soft QoS based call admission control scheme outperforms hard QoS scheme in terms of throughput and the maximum number of accepted calls.
Abstract: Although the MAC protocol provides service differentiation, it does not guarantee that the QoS requirement of each service will be fully satisfied. We propose a soft QoS based call admission control scheme to support the QoS requirements of multimedia traffic in IEEE 802.11e WLANs. In order to evaluate the performance of the proposed scheme, we developed the proposed algorithm in NS-2, and compared the proposed scheme with hard QoS scheme. Simulation results show that our proposed scheme outperforms hard QoS scheme in terms of throughput and the maximum number of accepted calls.
02 Feb 2005
TL;DR: Numerical results show that there is a substantial increment in system capacity by adopting MIMO system and the theory of the refined large deviation approach is a good approach for transient QoS support.
Abstract: This paper presents an efficient capacity evaluation algorithm of the WCDMA with multiple-input multiple-output (MIMO) system for quality of service (QoS) support. To define the capacity of the system, we derive the Eb/No gain taking into account MIMO concept and the outage probability as the QoS measure using central limit approximation, Chernoff bound and the refined large deviation approach. Based on the QoS measures, we propose an efficient transient call admission control (CAC) algorithm. Numerical results show that there is a substantial increment in system capacity by adopting MIMO system and the theory of the refined large deviation approach is a good approach for transient QoS support.