Abstract
This paper deals with the quality of service in IP Multimedia Subsystem networks. The evaluation of Quality o Service (QoS) is done through admission control methods. We analyse various methods, which are based on the traffic measurement. The approach that can be applied in finding the suitable admission control method while considering selected QoS parameters is described. Different important QoS parameters can be defined, however we decided to focus on the loss parameter. In our simulations we have used Simple Sum method. Based on the simulation results, we have used new algorithm. The main difference is that it uses the mechanism of time window for achieving more accurate traffic estimate. Algorithm Measured Sum with implementation of time window T has better ability to predict the traffic fluctuation. Compared to the Simple Sum algorithm it achieves lower link utilisation, but also lower level of loss ratio.
Highlights
The IP Multimedia Subsystem (IMS) is an architectural framework for delivering Internet Protocol multimedia services [1]
Parameters of the simulations and each Measurement Based Admission Control (MBAC) algorithm are shown in Table 1 and 2
We focused on the admission control methods in IP Multimedia Subsystem
Summary
The IP Multimedia Subsystem (IMS) is an architectural framework for delivering Internet Protocol multimedia services [1]. In this type of networks it is problematic to ensure acceptable levels of parameters like delay, jitter, or loss ratio. The goals of admission control methods are: to guarantee the quality of the service for the newly accepted connection without limitation of the other existing connections, to decide quickly with minimal delay and efficient use of the bandwidth capacity. MBAC methods: uses real-time network traffic measurement Based on this measurement and QoS requirements the MBAC method decides about new connection. For this measurement it is necessary to have information about the available bandwidth and some information about the data source that requests the connection. Are information about Simple sum algorithm and Measured Sum algorithm with time window
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