Title :
Utility Maximization in LTE-Advanced Systems with Carrier Aggregation
Author :
Wang, Yuanye ; Pedersen, Klaus I. ; Sørensen, Troels B. ; Mogensen, Preben E.
Author_Institution :
Aalborg Univ., Aalborg, Denmark
Abstract :
Long Term Evolution (LTE)-Advanced is expected to aggregate multiple Component Carrier (CC)s to fulfil the high data rate requirement. It may serve users with different capabilities in accessing these CCs, e.g., some can access all CCs, whereas some may operate on only one CC. This gives challenges to the packet scheduler to maximize the system performance over all CCs. In this paper we provide a mathematical model of the log-measure utility in an LTE-Advanced system, and give proof that our previously developed cross-CC Proportional Fair (PF) packet scheduler maximizes this utility. System level simulations are performed, which confirm that cross-CC PF scheduling offers much higher utility than independent PF and channel blind schedulers. This scheduler is then generalized to adjust the resource sharing among users. It can trade off between average cell throughput and cell edge user throughput. However, any adjustment in the resource sharing leads to a loss in utility.
Keywords :
Long Term Evolution; scheduling; LTE-advanced systems; Long Term Evolution; carrier aggregation; channel blind schedulers; cross-CC PF scheduling; cross-CC proportional fair; resource sharing; utility maximization; Bandwidth; Mathematical model; Measurement; Resource management; Scheduling algorithm; Throughput; Wireless communication;
Conference_Titel :
Vehicular Technology Conference (VTC Spring), 2011 IEEE 73rd
Conference_Location :
Yokohama
Print_ISBN :
978-1-4244-8332-7
DOI :
10.1109/VETECS.2011.5956494