Protocol architecture for gprs
The following section describes the basic protocol architecture of the transmission plane for GPRS.
Protocol architecture of the transmission plane for GPRS:
- Data between the GSNs is transferred using the GPRS tunneling protocol (GTP).
- GTP uses two different transport protocols, either the reliable TCP or the non-reliable UDP.
- Network protocol for the GPRS is IP.
- Sub network dependent convergence protocol (SNDCP) is used between an SGSN and the MS.
- User packet data is tunneled from the MS to the GGSN and vice versa.
- For reliable packet transfer between MS and SGSN, LLC is used, which comprises ARQ and FEC mechanisms.
- Base station subsystem GPRS protocol (BSSGP) is used to convey routing and QoS-related information between the BSS and SGSN. It works on top of a frame relay (FR) network
- Radio link protocol (RLC) provides a reliable link, while the MAC controls access with signaling procedures for the radio channel and the mapping of LLC frames onto the GSM physical channels.
Figure 8.17 protocol architecture of the transmission plane for GPRS