QoS Negotiation and Service Differentiation by CAC Scheme for 3G Wireless Cellular Networks

Abstract

In the 1G and 2G of wireless cellular systems, CAC has been worked only for a single service scenario. In the 3G and beyond wireless cellular systems, multimedia services such as video, data, and audio are to be offered with various QoS profiles. Hence, more sophisticated CAC schemes are needed to develop for dealing with these challenges. CAC is needed for admitting reasonable number of users in the sense that CAC can satisfy various QoS constraints for different services and also maximize the spectrum utilization for systems. CAC schemes play a vital role in the analysis of 3G wireless cellular network systems by controlling the users in a cell and thus limit the system interference. CAC has been extensively studied in wireless cellular networks as an essential tool for congestion control and QoS provisioning. CAC in wireless cellular networks has been achieving a huge pact of awareness during the existing generation due to the rising attractiveness of wireless cellular network and the fundamental role that CAC plays in QoS provisioning. Quality of service (QoS) plays a major role in wireless cellular networks and it is one of the most important issues from both the users and operators point of view. All the parameters related to QoS are not same important for all users and requested applications. The satisfaction level of different users also does not depend on same QoS parameters. Our proposed CAC scheme gives preferential treatment to higher priority calls, such as hand-off calls of all class of service (data, voice and video), by reserving some bandwidth to decrease handoff failure probability. Along with, mechanism of queuing is also used to improve the hand-off success probability. The admission principle depends upon the effective load of the scheme and allocates diverse thresholds for new and hand-off calls. Finally, we consider three types of services: video, voice and data calls. We assure that our scheme reduces the drop hand-off calls by queuing mechanism and increases the system capacity; hence the Grade-of-Service (GoS) and the system performance can significantly improve.