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Low-complexity medium access control protocols for QoS support in third-generation radio access networks\ud

By T. O'Farrell and P. Omiyi

Abstract

One approach to maximizing the efficiency of\ud medium access control (MAC) on the uplink in a future wideband\ud code-division multiple-access (WCDMA)-based third-generation\ud radio access network, and hence maximize spectral efficiency,\ud is to employ a low-complexity distributed scheduling control\ud approach. The maximization of spectral efficiency in third-generation\ud radio access networks is complicated by the need to\ud provide bandwidth-on-demand to diverse services characterized\ud by diverse quality of service (QoS) requirements in an interference\ud limited environment. However, the ability to exploit the full\ud potential of resource allocation algorithms in third-generation\ud radio access networks has been limited by the absence of a metric\ud that captures the two-dimensional radio resource requirement,\ud in terms of power and bandwidth, in the third-generation radio\ud access network environment, where different users may have\ud different signal-to-interference ratio requirements. This paper\ud presents a novel resource metric as a solution to this fundamental\ud problem. Also, a novel deadline-driven backoff procedure has\ud been presented as the backoff scheme of the proposed distributed\ud scheduling MAC protocols to enable the efficient support of\ud services with QoS imposed delay constraints without the need\ud for centralized scheduling. The main conclusion is that low-complexity\ud distributed scheduling control strategies using overload\ud avoidance/overload detection can be designed using the proposed\ud resource metric to give near optimal performance and thus maintain\ud a high spectral efficiency in third-generation radio access\ud networks and that importantly overload detection is superior to\ud overload avoidance

Year: 2005
OAI identifier: oai:eprints.whiterose.ac.uk:678

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