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TS 04.65 (CT1)
General Packet Radio Service (GPRS) – Mobile Station (MS) - Serving GPRS Support Node (SGSN); Subnetwork Dependent Convergence Protocol (SNDCP)

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(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:  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.


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1  ScopePDF-p. 7
2  References
3  Definitions and abbreviationsPDF-p. 8
4  General
5  Service primitives and functionsPDF-p. 10
6  Protocol functionsPDF-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 sequenceUp
6.5  Protocol control information compression
6.6  Data compression
6.7  Segmentation and reassemblyUp
6.8  XID parameter negotiationUp
6.9  Data transferPDF-p. 39
6.10  Possible combinations of SNDCP protocol functions and their connection to service access points
7  Definition of SN-PDUPDF-p. 41
8  SNDCP XID parametersPDF-p. 44
A  Change Request HistoryPDF-p. 45

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