PERFORMANCE ANALYSIS OF PF MAC SCHEDULER UNDER VARYING FEEDBACK DELAY IN LTE AND LTE-A EUTRAN

Ankit Saxena and Ravi Sindal

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Keywords

Proportional Fair Scheduler, Long Term Evolution, Long Term Evolution-Advance

Abstract

Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (EUTRAN) deals with high uplink and downlink throughput. The Proportional Fair (PF) Medium Access Control (MAC) scheduler offered a good balance between allocated resources and fairness among the User Equipment (UE) in comparison with other schedulers. In the PF scheduler, at each cycle of resource allocation, a feedback mechanism ensures that operational resource requirements are met while maintaining a degree of fairness among the UE. We analyze the effect of feedback Transmission Time Interval (TTI) delay on two typical EUTRAN networks, in terms of Key Performance Indicators (KPIs). One network is referred to as EUTRAN LTE and the other as EUTRAN LTE-A, which fulfils high throughput requirement. We evaluate the performance of the PF MAC scheduler for both networks under varying feedback delay in TTI. Simulated results show that the delay in TTI affects the performance of resource allocation in terms of throughput, fairness, and spectral efficiency. Feedback delay improves network performance by compensating effect of imperfect channel condition.

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