Downlink Scheduling and Rate Capping for LTE-Advanced Carrier Aggregation

Mieszko Chmiel, Jin Shi, David X. Zhou

LTE System Design & Architecture, Nokia Siemens Networks, Beijing, China.

DOI: 10.4236/cn.2013.53B2001                

Abstract

Long Term Evolution (LTE) Carrier Aggregation (CA) was introduced by the Release-10 3GPP specifications. CA allows aggregation of up to 5 cells for a terminal; both downlink (DL) CA and uplink (UL) CA are supported by the 3GPP specifications. However, the first commercial deployments focus on the aggregation of two cells in the downlink. The benefits of LTE CA are increased terminal peak data rates, aggregation of fragmented spectrum and fast load balancing. In this paper, we analyze different strategies of DL scheduling for LTE CA including centralized, independent and distributed schedulers, we provide the corresponding simulation results considering UE data rate limitations and different traffic models. Also, we compare the performance of a single LTE carrier with LTE CA using the same total bandwidth.

Keywords

Long Term Evolution; Carrier Aggregation; Scheduling; Downlink; Bandwidth

Conflicts of Interest

The authors declare no conflicts of interest.

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