ABSTRACT
Introduction..........................................................................................................345 Instant.Message.(IM)...........................................................................................346 Presence.Service.(PS)...........................................................................................348 3GPP.IMS.Presence.Service................................................................................356 Discussion.and.Conclusions..............................................................................360 Acknowledgment................................................................................................. 361 References............................................................................................................. 361
Instant.messaging.and.presence.service.(IMPS).is.a.hot.and.popular.topic.in. Internet.circles..Many.IMPS.applications,.such.as.ICQ,.MSN,.Yahoo!.Messenger,.and.Google.Talk,.are.widely.deployed.and.utilized.for.short-term.and. near-real-time.communications..In.recent.years,.IMPS.has.changed.communication.behavior..With.IMPS,.users.are.aware.of.the.presence.information. of.their.friends.and,.thus,.IMPS.users.can.choose.the.most.effective.way.(e.g.,. voice.or.instant.message).to.communicate..IMPS.is.one.of.the.killer.applications.among.all-IP.services.
