Comparison of link-layer segmentation methods for UMTS terrestrial radio access networks

Abstract

Most user traffic types have limited delay/jitter budget over the Iub interface of UMTS. For example, the strict requirement for data bearers is due to synchronization of soft-handover legs. As the requirement for traffic types differs, the application of QoS solutions, such as multiple QoS classes and segmentation of large packets, is needed. In this paper, we propose results that can be used to improve the operation of link layer QoS mechanisms. We propose novel segmentation methods that decrease the delay of both low priority and high priority packets in a priority system. We have also developed new analytic results and performed simulations for the comparison of the segmentation methods.