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The Next generation wireless networks (NGWN) will be heterogeneous which will able to have different radio access technologies (RATs) operating together. The Radio Resource Management (RRM) is one of the key challenges in NGWN. The Call admission control (CAC) mechanism is one of the Radio Resource Management technique plays most important role for ensuring the desired QoS to the users working on different applications which are having the diversified nature of QoS requirements to be fulfilled by the wireless networks. One of the key challenges to be addressed in this prevailing scenario is the distribution of the available channel capacity among the multiple traffic with different bandwidth requirements so as to guarantee the QoS requirements of the traffic. The call blocking probability is one of the QoS parameter for the wireless network and for better QoS it is desirable to reduce the call blocking probability. Provision of quality-of-service (QoS) guarantees is an important and challenging issue in the design of integrated services packet networks. Call admission control (CAC) is an integral part of the problem. Without call admission control, providing quality-of-service (QoS) guarantees will be impossible. The issue of call admission control is closely
related to other aspects of a network, such as service models, scheduling disciplines, traffic characterization and QoS specification. Call admission control (CAC) with statistical quality-of-service (QoS) guarantees is a particularly important and challenging problem. One of the most important challenges is that of providing call admission control (CAC) for a heterogeneous mixture of applications which have differing quality-of-service (QoS) requirements. The advances in multimedia applications over a wide area network have directed considerable research into the quality of service. A comprehensive exposition of the specifications and management of quality of service (QoS) in wireless networks and in distributed computing systems, supporting multimedia applications, are important for both service providers and end users. This article is a survey to explore issues concerning the quality of service in the current and next generation wireless networks.
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