Performance of idle mode mobility state detection schemes in Evolved UTRAN

Abstract

In this paper we study the performance of idle mode mobility state detection schemes targeted for 3rd Generation Partnership Project (3GPP) Evolved UTRAN. The purpose is to compare the mobility state detection scheme specified in 3GPP Release 8 and a dual trigger scheme for 3GPP Release 9 using different User Equipment (UE) velocity conditions and cell reselection triggering sensitivity levels. A single set of cell reselection parameters may not be optimal throughout the E-UTRAN velocity range, thus both schemes provide in a way a means of using UE velocity dependent cell reselection parameters. According to the results, both schemes provide gain over a single set of cell reselection parameters. Dual trigger provides gain over Release 8 mobility state detection scheme in terms of time spent in the best cell and downlink SINR. However, this comes with a small increase in power consumption due to increased amount of cell reselections per UE.