A new protocol layer is provided as part of a protocol stack associated with a packet-based multiaccess mobile communications system. The protocol layer is preferably located above a medium access control (MAC) protocol layer and a physical protocol layer of the system and below a transport/network protocol...http://www.google.es/patents/US7502361?utm_source=gb-gplus-sharePatente US7502361 - Subnetwork layer for a multimedia mobile network
