Priority-Scaled Preemption of Radio Resources for 3GPPLTE Networks
S. M. Chadchan, C. B. Akki · International Journal of Computer Theory and Engineering · 2011
The preemption technique plays an important role in the radio resource management (RRM) of 3GPP Long Term Evolution (LTE) networks. In preemption handling methods, the resource allocation to high priority bearer requests is done by preempting the resources either partially or fully from the low priority preemptable active bearers (LP PABs). The paper proposes the priority-scaled (PS) preemption technique using Allocation and Retention Priority (ARP). The proposed technique suggests the priority-scaled (PS) preemption of resources up to minimum quality of service (QoS) level from all LP PABs. This is in contrast with conventional preemption technique, wherein high priority bearer requests preempt resources completely up to minimum QoS level, with PABs selected in sequence from lowest priority onwards. The paper investigates performance of the proposed technique in terms of number of active bearers dropped and blocked to accommodate higher priority bearer requests. The PS preemption technique reduces the dropping of LP PABs compared to conventional technique for subsequent arrivals of new low priority radio access bearer (RAB) requests, at the cost of QoS by higher priority bearer services. However, the QoS sacrifice made by the high priority PABs is limited to minimum QoS level.