Service Communautaire d'Information sur la Recherche et le Développement - CORDIS

The CREDO TSMS - NSMS protocol

The CTNP is a software suite for allowing TSMS-NSMS peer operation, i.e. a logical connections between the TSMS and NSMS functions. CTNP is not self-contained: TSMS and NSMS are needed as protocol termination points.

The CREDO TSMS - NSMS Protocol (CTNP) or Network Access Co-ordination Protocol (NACP) constitutes the interface between the composite radio management system (NSMS) and the multimodal terminal management entity (TSMS), also both developed by the CREDO project. The necessity for defining a specific protocol derives from the fact that additional information has to be exchanged between the management system and the terminals.

The TSMS - NSMS interaction ensures that the “local view” of the terminal (radio conditions in the area, specific content services received over that terminal, the QoS levels associated with these services, etc) and the “global view” of the network (traffic load over the various segments, the need to avoid congestion towards preserving QoS, etc) are beneficially combined.

The most important messages exchanged are the followings:
- “Service Request / Service Reply”,
- “Handover Notification”,
- “Quality Reports”.

Although CREDO project for simplicity reasons introduced the CTNP as a stand-alone UDP protocol, the underlying philosophy and the content of the exchanged messages could be easily implemented over TCP or be included as an extension at already existing session or mobility handling protocols (e.g. SIP or MIP).

Reported by

Institute of Computer and Communication Systems (ICCS)
9 Heroon Polytechneiou Street
15773 Zographou, Athens