Abstract
In this chapter, we present a distributed QoS-aware MAC scheme which facilitates users in private access small cells to find the channels with fewer active macrocell users nearby so that they can transmit at higher power for better link quality while maintaining tolerable interference on macrocell transmissions. Specifically, based on the channel usage patterns of macrocell users, users in small cells determine a set of channels for channel sensing and data transmissions to satisfy their QoS requirements in support of multimedia applications. The MAC function is further enhanced in QoS provisioning by applying differentiated arbitrary sensing periods (ASPs) for various types of traffic. An analytical model is developed to study the MAC layer performance taking the activities of both macrocell users and small cell users into consideration. Along with the dynamic channel access, a penalty based power allocation scheme is used to manipulate the transmissions of small cell users in a cost-effective way given limited backhaul bandwidth. Extensive simulations validate the analysis and demonstrate that the presented MAC can achieve multiple levels of QoS provisioning for various types of multimedia applications in HetNet.
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