Kang, Min Seok; (1999) Supporting integrated services in a cellular packet switched network. Doctoral thesis (Ph.D), UCL (University College London).

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Abstract

The third-generation cellular network should be capable of accommodating the integration of data sources with various QoS requirements, along with voice service. There has been no lack of research effort on the integrated services for fixed networks, but these methods cannot be directly applied to a cellular packet network since it has different characteristics such as the handovers and varying available bandwidth due to mobile hosts. This thesis presents an integrated service architecture for the cellular packet switched network and deals with its design issues. It provides uplink and downlink connections with diverse QoS keeping an identical link service for both link directions whilst maintaining fairness among connections regardless of handovers. The service architecture we propose in this thesis can accommodate multiple scheduling disciplines to serve various traffic according to their traffic characteristics. For the service architecture, we developed two scheduling disciplines, PEDQ (Packet Endurable Delay Queuing) and PCAWFQ (Packet-by-Packet Combined Absolute and Weighted Fair Queuing). The PEDQ is designed for delay-intolerant traffic and schedules packets according to the remaining lifetime of a packet to minimise packet drops. The PCAWFQ is a general packet scheduling discipline designed for scheduling delay-tolerant traffic in a variable-rate link and can simultaneously schedule three different kinds of flow classes according to their class service policies. For handling uplink traffic, we propose a multiple access protocol called FQMA (Fair Queuing Multiple Access) which is a slot-based protocol to manage delay-intolerant and delay-tolerant traffics simultaneously using the proposed two scheduling disciplines, whilst performing a decoupling between both traffic to prevent delay-tolerant traffic from degrading the service performance for delay-intolerant traffic. We also propose the proxy packet-scheduling concept to serve distributed packets in mobile hosts as if they are queued in a single queue. It enables a scheduling scheme designed for downlink service to serve uplink traffic. We also investigate and analyse the proposed system in the handover environment. We identified that unfairness occurs in some types of schedulers during handovers due to packet forwarding. We also identified that misordered packet delivery might occur during handovers if a handover protocol does not take account of the packet level service. We propose a compensation scheme and a packet forwarding-aware handover protocol to remedy both problems respectively. Finally, we validate our proposed service model using simulations with the OPNET simulator. We conclude that the proposed service model is viable and can provide guaranteed integrated services in a cellular packet switched network.

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