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An Improved Scheduling Algorithm for Real-Time Uplink Services in IEEE82.16e

In IEEE802.16e, scheduling services represent the data handling mechanisms supported by the MAC scheduler for data transport on a connection. Each connection is associated with a single scheduling service. A scheduling service is determined by a set of QoS parameters that quantify its behaviors. Taking three types of scheduling services into consideration, UGS (unsolicited granted scheduling), rtPS (realtime polling scheduling) and ertPS (extended realtime polling scheduling), this paper proposes a realtime uplink scheduling service algorithm by modeling an Improved ertPS scheduling service algorithm which maximizes the usage of uplink access resource and guarantees data rate and delay requirement. Simulation results show that the throughput performance of the proposed algorithm is better than the algorithms in IEEE802.16e on the basis of guaranteed delay performance.