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3GPP (CT1)
TS 04.65














General Packet Radio Service (GPRS) – Mobile Station (MS) - Serving GPRS Support Node (SGSN); Subnetwork Dependent Convergence Protocol (SNDCP)

(P) GSM Rel-99 v8.2.0    2001/09    47 p.
(P) GSM Rel-98 v7.3.0    2000/03    45 p.
(P) GSM Rel-97 v6.7.0    2000/03    45 p.

Rapporteur:  DROSTE, Scott
Descendant(s):  TS 44.065    

This TS provides the description of the Subnetwork Dependent Convergence Protocol (SNDCP) for the General Packet Radio Service (GPRS).

The user of the services provided by SNDCP is a packet data protocol (PDP) at the mobile Station (MS) or the Relay at the Serving GPRS Support Node (SGSN). Additionally, a control entity, e.g., AT command interpreter, may be an SNDCP user. SNDCP uses the services provided by the Logical Link Control (LLC) layer and the Session Management (SM) sub-layer.

The main functions of SNDCP are:
  • Multiplexing of several PDPs.
  • Compression / decompression of user data.
  • Compression / decompression of protocol control information.
  • Segmentation of a network protocol data unit (N PDU) into Logical Link Control Protocol Data Units (LL PDUs) and re-assembly of LL PDUs into an N PDU.
This TS is applicable to GPRS MS and SGSN.

1   Scope   PDF-p. 7
2   References
3   Definitions and abbreviations   PDF-p. 8
4   General
5   Service primitives and functions   PDF-p. 10
6   Protocol functions   PDF-p. 20
6.1   Multiplexing of N-PDUs
6.2   Establishment and release of acknowledged peer-to-peer LLC operation
6.3   N-PDU buffering
6.4   Management of delivery sequence      Up
6.5   Protocol control information compression
6.6   Data compression
6.7   Segmentation and reassembly      Up
6.8   XID parameter negotiation      Up
6.9   Data transfer   PDF-p. 39
6.10   Possible combinations of SNDCP protocol functions and their connection to service access points
7   Definition of SN-PDU   PDF-p. 41
8   SNDCP XID parameters   PDF-p. 44
A   Change Request History   PDF-p. 45