An enhanced forward-link scheduling algorithm for cdma2000 1× EV-DO

Abstract

cdma2000 1× EV-DO system is originally designed to support high date rate services, but with the development of demand, it is expected to serve some other traffic such as VoIP which belong to conversational QoS class and interactive games. In traditional EV-DO system forward link scheduling, proportional fair (PF) algorithm is used, which doesn't consider QoS like delay and loss, so it can't work when different QoS requirement users are waiting to be served by the same AN(Access Network). To solve this problem, in the latest release of EV-DO specification, a Multi-User packet (MUP) scheme is introduced. Security layer Packets from different ATs (Access Terminal) can be packed into a same MAC layer packet and then be transmitted to the physical layer, however, when should AN use MUP and how to schedule different users to fill this MUP is a problem. A proper scheduling algorithm must be used to optimize system performance. In this paper, we propose a forward link scheduling algorithm supporting the MUP scheme and show performance of EV-DO system under this scheduler.