Efficient Semi-Persistent Scheduling for VoIP on EUTRA Downlink

Abstract

Evolved UTRA (EUTRA) is currently under standardization within 3GPP as a long-term evolution (LTE) of universal terrestrial radio access (UTRA) air interface. Due to the potentially large number of VoIP users served in this system, related control signaling overhead for VoIP transmissions with traditional full dynamic scheduling scheme could become a bottleneck and limit the system capacity to a greater extent. In this paper, we present a semi-persistent packet scheduling scheme for VoIP to explore the capacity within the limitation of control channel resources. System level simulation results show that semi-persistent scheduling scheme can reduce control channel usage without using packet bundling technique. With 6 control channels, around 310 users per sector can be supported in 5 MHz bandwidth with both discontinuous reception (DRX) enabled and without packet bundling.