Feasibility study for enhancement of radio performance for Voice over IP Multimedia Subsystem (VoIMS); Report on technical options and conclusions
The present document describes architecture changes for Voice over IMS service to allow enhancement of radio performances in RAN. This work focuses on the PS domain with the assumption that voice services are supported in this domain.
Two radio optimization methods have been identified to provide radio optimisation for VoIMS: Unequal Error Protection (UEP) and Header Removal (HR). With the information currently available in RNC, RNC cannot use these optimisation methods. More study is then needed to describe which additional information are needed by RNC and how these information can be provided to RNC.
Radio optimisations for the SIP signalling are out of the scope of this TR. The study will focus on the bearer optimisation for user data.
Radio optimisations with no architecture impact outside the UTRAN are out of the scope of this TR.