A hybrid timer-based scheduling request scheme for packetized mobile communications

This paper presents a hybrid timer-based scheduling request scheme in wireless packet systems to provide quality-of-service for uplink multimedia transmission and also gives an analytic model for invalid allocation probability which can be used for estimating the performance of various uplink scheduling methods. The scheduling information request timer in base station controls the periodicity of resource request which is normally performed by random accesses with some performance degradation on mobiles´ initial access or handover. We observe that the hybrid scheme significantly reduces the number of random accesses, as compared to the random access-based resource request scheme where sending the scheduling information fully depends on random access, providing similar performance on other metrics.