Analysis and Optimizations of Presence Generated Traffic for Cellular Networks
David Henriksson · KTH Publication Database DiVA (KTH Royal Institute of Technology) · 2005
Presence services have grown increasingly popular during the last decade and today there exist several implementations designed for the Internet. When designing a presence service for cellular networks, new aspects regarding limited network resources and compatibility have to be considered. In this master's thesis, presence traffic generated according to the Push-to-Talk over Cellular presence specification is analyzed. Different presence updating models are compared through simulations and optimizations in the form of limiting unnecessary messages are suggested. The presence impact on WCDMA capacity has also been investigated by comparing the resources needed for presence and Voice over IP generated traffic. The results show that mechanisms for limiting the number of presence messages are needed, either by throttling the number of presence messages sent or by letting the users perform pulls in order to download the information. Without any kind of message limitation mechanism, presence messages could halve the number of Voice over IP users supported within one radio cell. Depending on the intensities of presence signaling, the decrease in the number of supported users can be limited to between 12 and 30 percent by using throttling and 10 to 17 percent using pull.