(An) efficient call admission control in wireless multimedia networks

Abstract

In the next generation multimedia wireless networks, it is important to provide quality-of-service (QoS) guarantees as they are expected to support multiple-class calls (i.e. voice, video, and data etc.). This thesis proposes an admission control scheme that is more efficient in a case, where each class needs different QoS. The proposed scheme reserves the different amount of guard channels for handoff calls of each class to satisfy different QoS (i.e. the desired dropping probability). In addition, the proposed scheme considers an idea to probabilistically share the unused guard channels for different classes. To examine the performance of the proposed scheme we compare three schemes. In scheme 1, all the handoff calls of all the classes completely share the total guard channels. In scheme 2, handoff calls of each class only use guard channels exclusively allocated to each class. In the proposed scheme, unlike scheme 2, handoff calls of each class can probabilistically use the unused guard channels for other classes. In the result of simulation, if the difference between the desired dropping probabilities of each class is large, we show that the proposed scheme satisfies the desired dropping probability of each class with fewer number of guard channels than scheme 1 and 2. Therefore, the proposed scheme accepts more new calls than scheme 1 and 2.