Impact of the Timer-CU of the AAL2 Protocol on Traffic Performance within the UTRAN
Rani Makké, Samir Tohmé, Jean-Yves Cochennec, Sophie Pautonnier · Kluwer Academic Publishers eBooks · 2005
The UMTS (Universal Mobile Telecommunication System) is the future network for mobile communication systems. The access network of UMTS is called UTRAN (Universal Terrestrial Radio Access Network). Many works focus on the quality of service (QoS) aspects within the UTRAN and the dimensioning aspects of the links between different nodes in the UTRAN. In Release 99 of the 3GPP standard, AAL2/ATM protocol is chosen as a transport protocol within the UTRAN. The Timer-CU is an important parameter for the AAL2 protocol. High Timer-CU values lead to high transfer delays for low bitrate applications, and low values lead to an efficiency loss in the ATM connections. To optimize the choice of this value, we focus our study on the impact of the Timer-CU on the QoS parameters for real time traffic and especially voice applications.