Open service access in cross layer design

The paper investigates an approach to exchange quality of service information across the layers between third party applications and network functions for bearer resource management. The focus is on Parlay X Web Services which may be used to access functions for policy and charging control in all IP-based multimedia networks. A functional mapping of Parlay X interfaces onto network control protocol is suggested. The Parlay X Gateway utilization is evaluated taking into account as its distributed architecture, as the processing of both requests and notifications of events, concerning QoS management.