SNDCP Sub Network Dependent Convergence Protocol
In addition to the protocols used to carry GMM (GPRS Mobility Management) information across the Gb interface; namely LLC (Logical Link Control) and BSSGP (Base Station Subsystem GPRS Protocol), a further protocol exists which is used to transfer data between the mobile and the SGSN as a result of the activation of a PDP Context. Termed SNDCP (Sub Network Dependent Convergence Protocol), the protocol resides on top of LLC and provides compression and segmentation services to the protocols being carried in GPRS - IPv4 and IPv6.
