Performance Analysis of Two Level Calendar Disc Scheduling in LTE Advanced System with Carrier Aggregation

Carrier aggregation (CA) is introduced in long term evolution advanced (LTE-A) networks for effectively utilize the wider bandwidth of up to 100 MHz, while ensuring the backward compatibility with LTE networks. So, a well-designed scheduling method is indispensable when both the type of users (LTE and LTE-A users) is present in the network. In this paper, a two level calendar disc scheduling method is proposed to satisfy the quality of service requirements of real-time users. A calendar disc is a continuous time frame of one component carrier. Initially, the level-1 scheduler, namely, the disc scheduler (DS) schedules the packets based on user type, packet type and the supported CA by the user equipment by calculating the DS metric and creates calendar discs. At the next level, level-2 scheduler called super scheduler schedules the packets in frequency domain by processing on those calendar disc created by DS. From the simulation results it is confirmed that the algorithm provides 7% increase in Total Goodput, 50% reduction in PLR, 16% reduction in delay for VoIP flows and 5% increase in Total Goodput, 88% reduction in delay for video flows when compared to the existing algorithm.