Description:
Abstract Quality of service (QoS) for voice over IP network is not consistent because of
absence of dedicated links as in circuit switched (CS) network. Because of wider
mobility to users in UMTS network and voice over IP network being low cost service,
performance evaluation for VoIP service over UMTS network is realized more
important. Prioritized forwarding strategy to different traffics can be controlled
allocating Forward Access Channel (FACH) Scheduling weights in Radio Network
Controller (RNC) and Resource Reservation Protocol (RSVP) for the resource
allocation like buffer space, bandwidth etc. In this paper, End-to-End QoS of UMTS
is mapped to external IP network with Differentiated Service Code Point (DSCP) field
in IP packet header specifying different per hop behavior (PHB) and significant
improvement in QoS of VoIP service over UMTS network has been observed. Hybrid
model of QoS enhancement with DiffServ Code Point integrated to FACH scheduling
weight inside UMTS network and RSVP scenario has been studied in this work and
the model has been purposed to reduce End-to-End delay maintaining better Mean
Opinion Score (MOS).