Congreso: XXIII Simposium Nacional de la Unión Científica Internacional de Radio (URSI 2008). 22-24 septiembre 2008. Madrid, España.

Autores: Mariano Molina-García y José I. Alonso.

Although networks based on IEEE802.11 wasoriginally intended to transport best-effort data traffic, theincorporation of new standards like IEEE802.11e has broughtabout the opportunity of supplying real time voicecommunications with strict requirements of quality of service.In WLAN IEEE802.11 networks, the handover process follow a“break-before-make” mechanism, provoking discontinuities inthe communication, which have associated a variation of thepacket loss rate, and, therefore, changes in the subjectivequality of voice perceived by the user along the communication.It will be necessary to take into account this effect in theplanning and sizing process of WLAN networks which have todeal with conversational services. With this purpose, in thispaper is illustrated the influence of the horizontal handoverevents on the evolution of the conversational quality fordifferent VoIP codecs and several handover decisionalgorithms.