METHOD, COMMUNICATION NETWORK AND SERVICE ACCESS INTERFACE FOR COMMUNICATIONS IN AN OPEN SYSTEM INTERCONNECTION ENVIRONMENT

The invention relates to a method, a communication network and a service access interface for performing communications between cooperating open systems in an open system interconnection environment. The upward service access point (USAP) is adapted to transfer layer-specific parameters, e.g. quality of service parameters to a layer of higher order. Thus, the running application can adaptively change its own performance to transmission characteristics in any one lower layer.