CALL ADMISSION CONTROL METHOD

摘要

A system of call admission control is proposed that utilises a restriction factor to limit the number of new incoming calls admitted to a path of a packet-switched network. The restriction factor is determined on the basis of the load condition on the path as defined by measured performance indicators, such as jitter and packet loss. Preferably, the restriction factor is adjusted on the basis of both a previous load condition and a current measured load condition. The system is capable of reacting rapidly to any change in the congestion of a link while remaining stable. By determining the load on the path primarily based on the measured jitter, the system reacts to congestion in a proactive manner before experiencing packet loss. Furthermore, it ensures a good utilisation of the network is possible even in a situation of high congestion, provides acceptable voice quality even on bottleneck links and can be implemented entirely in an edge node of the network and hence does not require additional algorithms or mechanisms within in the core network, such as signalling and resource reservation.