Joint call admission control/congestion control for wireless integrated voice/data networks

Authors:
Shun-Ping Chung;Chin-Lien Chiu
Affiliations:
Department of Electrical Engineering, National Taiwan University of Science and Technology, 43, Keelung Road, Section 4, Taipei, Taiwan, ROC;Department of Electrical Engineering, National Taiwan University of Science and Technology, 43, Keelung Road, Section 4, Taipei, Taiwan, ROC
Venue:
Computer Communications
Year:
2002

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Abstract

We consider wireless communication systems supporting both voice and data services, where not only call admission control (CAC) is used to maintain quality of service (QoS) at the call level, but also congestion control is used to guarantee QoS at the packet level. The CAC adopted is a simple threshold scheme, i.e. the number of voice terminals in use cannot exceed a threshold. The congestion control used is a modified version of dynamic time division multiple access with priority-based request packet transmission scheme (D-TDMA/PRPTS), where to avoid excessive delay due to mini-slot contention, voice request packet is dropped if it cannot succeed in the originating frame. For comparison, two scenarios involving only the voice traffic are considered: dynamic and static. In dynamic scenarios, the number of ongoing voice calls may vary over time, whereas that in static scenarios, it is fixed. With appropriate Markovian models, the voice packet loss probability, voice call blocking probability and channel utilization of voice traffic are derived, and the analytical results are verified with the simulation results. For integrated voice/data traffic, due to the mathematical complexity, only computer simulation is used to evaluate the effect of proposed CAC and congestion control on the performance measures of both voice and data traffic.