Performance Evaluation of Carrier Aggregation for Elastic Traffic in LTE-Advanced Systems

Lei LEI  Kan ZHENG  

IEICE TRANSACTIONS on Communications   Vol.E92-B   No.11   pp.3516-3519
Publication Date: 2009/11/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E92.B.3516
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
carrier aggregation,  processor sharing,  LTE-advanced,  trunking efficiency,  

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Carrier aggregation is a potential technology for the LTE-Advanced system to support wider bandwidth than the LTE system. This paper analyzes the performance of carrier aggregation under elastic traffic, and compares it to that of a simpler approach for the same purpose, referred to as the independent carrier approach. The queueing behaviors of these two approaches are formulated as one fast versus multiple slow state-dependent Processor Sharing servers, respectively. Both analytical and simulation results show that when there are L component carriers with uniform bandwidth in the system, the performance of the carrier aggregation approach is L times better than that of the independent carrier approach in terms of the average user delay and throughput under the same traffic load.