Scheduling Schemes for Carrier Aggregation in Lte-Advanced Systems

Abstract

Considering the needs of higher data rates and hence wider bandwidths for advanced mobile communication systems, 3GPP standardized carrier aggregation (CA) as one of the important technological components for fourth generation (4G) Long term evolution (LTE) advanced systems. Here the user equipments are assigned carrier component (CC) belonging to different (Interband contiguous/noncontiguous) or same spectrum bands (Intra-band contiguous/non-contiguous). The users share the radio resources as per different scheduling schemes like round robin(RR), proportional fair (PF), best channel quality indicator (CQI), max-min, edge prioritized, channel traffic aware etc. Every scheduler has its own characteristic and provides improvement in terms of throughput or fairness. This paper discusses the simulations carried out to study the performance of RR, PF and best CQI schedulers in an urban, CLSM (closed loop spatial multiplexing) environment using an LTE system level simulator.

Overview of 5G New Radio and Carrier Aggregation: 5G and Beyond Networks

“…Carrier Aggregation is the technology to enhance the data capacity, throughput, data rates and improved network performance in the uplink, downlink, or both. It allows efficient spectrum utilization by combining two or more carriers in the same or different frequency bands, into a single aggregated channel [13] [15]. It enables aggregation of FDD and TDD and licensed and unlicensed carrier spectrums.…”

“…Cross-carrier scheduling is an important feature in HetNets to mitigate the issues of inter-cell interference at celledge. It can be used to balance the traffic loads and scheduling across different component carriers [15][16] [17].…”

“…DSS provides a cost-effective and efficient solution for enabling a smooth transition from 4G to 5G by allowing LTE and NR to share the same carrier. In release 16, the number of rate-matching patterns available in NR has been increased to allow spectrum sharing when CA is used for LTE [15].…”