Special issue on radio resource management for provisioning IP-based QoS in wireless cellular networks
International Journal of Communication Systems
Quality of service (QoS) has been a commonly overused term with various meanings and perspectives in the past few years. IP networks such as the Internet and Wireless Cellular Networks (WCN) have been looking at QoS provisioning from rather different perspectives. Currently, two operational QoS models are proposed for the Internet: Integrated Services (IntServ) aided with Resource Reservation Protocol (RSVP), and Differentiated Services (DiffServ). Both models mainly concentrated on migrating
... aditional best effort Internet service with no guarantee on delay or throughput or even reliable delivery of packets into a more predictable architecture. The IntServ model aims to guarantee the QoS in a manner of end-toend fine granularity, but its scalability is impaired by the need to maintain per-flow state at each core router. The DiffServ model attempts to resolve the scalability problem by replacing the perflow service with an aggregate-class, per hop service, while pushing the per-flow state management to edge routers. Extending such QoS paradigms to WCNs is an important step towards achieving all-IP networking. Enhanced Radio Resource Management (RRM) techniques are needed to improve system performance by maximizing the overall system capacity and maintaining the QoS of mobile user traffic. RRM is a set of algorithms that control the usage of the scarce radio resources. RRM functionality is aimed to maximize the overall system capacity in the cellular network. A common definition for capacity is the maximum traffic load that the system can accommodate under some pre-defined service quality requirements. In order to study effective resource management techniques, it is necessary to understand and define the conditions that limit the cellular capacity. These conditions are related to the services characteristics (voice, video or data), the propagation channel variations, the power control operation and the user mobility patterns. The basic RRM components can be classified as follows: Handoff and mobility management, Call Admission Control (CAC), load control, channel allocation and reservation, packet scheduling and power control. RRM in present cellular systems has essentially been optimized for voice services. However, this is not valid when IP-based QoS is to be supported. QoS requirements can be parameterized in terms of service guarantees and/or service differentiation of throughput, delay, delay variation (jitter), loss and error rates, security guarantees, etc. Therefore, the need for enhanced RRM strategies to enable IP-based QoS provisioning becomes more important. We are honoured and pleased to report that we have received a total of 25 high-quality paper submissions out of which we were able to accept six. The following briefly introduces the six papers that have been selected to appear in this issue.