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International Journal of Scientific and Engineering Research
ISSN Online 2229-5518
ISSN Print: 2229-5518 8    
Website: http://www.ijser.org
scirp IJSER >> Volume 2, Issue 8, August 2011
An Efficient Handoff Scheme for Multimedia Traffic in OFDMA System
Full Text(PDF, 3000)  PP.  
Manjusha Mangrulkar, Prof. C.N.Deshmukh
Call Admission Control (CAC), Call Blocking Probability (CBP), Call Dropping Probability (CDP), Broadband Wireless Access (BWA), OFDMA, IEEE 802.16e, Grade of Service (GoS)
The IEEE 802.16e Broadband Wireless Access (BWA) system is developed to cater for rapidly growing requirement for multimedia wireless services. Since the heterogeneous services provided by the system are connection-oriented, Call Admission Control and required resource reservation mechanisms are needed to achieve desired quality of service (QoS). Traditional admission control algorithms are based on bandwidth or channel reservation policy, which may be incompetent in IEEE 802.16e OFDMA systems for two reasons: (i) WiMAX system supports dynamic and flexible resource allocation, and (ii) there exists a fundamental tradeoff between bandwidth resource and power resource. In this paper, we propose an efficient call admission control scheme based on maximum use of subchannels using AMC to minimize the overall transmit power in OFDMA systems. Based on power reservation, we propose two power reservation schemes for inter-cell handoff calls and intra-cell handoff calls, respectively. Correspondingly, two reservation factors are introduced, the values of which are determined by optimizing the metric of Grade of Service (GoS). Computer simulation is carried out to evaluate the performance of the proposed call admission control scheme based on power reservation.
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