An efficient scheduling scheme to enhance the capacity of VoIP services in evolved UTRA uplink
EURASIP Journal on Wireless Communications and Networking - Theory and Applications in Multiuser/Multiterminal Communications
LTE, The UMTS Long Term Evolution: From Theory to Practice
LTE, The UMTS Long Term Evolution: From Theory to Practice
Opportunistic beamforming using dumb antennas
IEEE Transactions on Information Theory
Providing quality of service over a shared wireless link
IEEE Communications Magazine
An introduction to the multi-user MIMO downlink
IEEE Communications Magazine
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User scheduling in future cellular networks is a complex and much-studied problem, further complicated in the increasingly relevant scenario of delay-sensitive VoIP applications. In such cases, the full buffer model that attempts to maximise the total sum-rate of the individual users does not adequately capture the satisfaction level of the users. As a result, fairness needs to be introduced and this is done in this paper through a modification of the weighted fair queuing (WFQ) approach to resource allocation that uses buffer status reports from mobile terminals (MTs). Put another way, user rates are weighted by respective buffer fill levels. In addition to outperforming both maximum sum-rate and the "conventional" proportional fair scheduling (PFS) algorithm in terms of the number of satisfied users for VoIP applications, the WFQ used is shown to be able to help reduce the signalling overhead: it is demonstrated here that the weights applied can be adapted depending on the frequency with which the resource allocation is updated. This enables the system to benefit from the reduction in signalling overhead (which arises from a reduced resource allocation update rate) at a diminished loss of performance. Results are based on practical simulation scenarios that can be applied to both LTE and W-CDMA systems and are revealing in terms of the user capacities these systems can offer under realistic levels of traffic load.