3 Definitions and abbreviations

04.653GPPGeneral Packet Radio Service (GPRS)Mobile Station (MS) - Serving GPRS Support Node (SGSN)Release 1999Subnetwork Dependent Convergence Protocol (SNDCP)TS

3.1 Definitions

In addition to abbreviations in 3GPP TS  01.04 [1] and 3GPP TS  02.60 [2] the following abbreviations apply:

N201 LLC layer parameter (see 3GPP TS 04.64 for clarity). Defines maximum number of octets in the information field of LL‑PDU. Separate values are applicable for I (see N201-I), U and UI (see N201-U) LL‑PDUs.

N201-I LLC layer parameter (see 3GPP TS 04.64 for clarity). Defines maximum number of octets available to a SN‑DATA PDU for a specific SAPI.

N201-U LLC layer parameter (see 3GPP TS 04.64 for clarity). Defines maximum number of octets available to a SN‑UNITDATA PDU for a specific SAPI.

N‑PDU number A sequence number assigned to N‑PDUs per NSAPI.

NSAPI For each SN‑PDU the NSAPI is an index to the PDP context of the PDP that is using the services provided by the SNDCP layer.

Receive N‑PDU number The value of the N‑PDU number expected in the next N‑PDU received by an NSAPI using acknowledged peer-to-peer LLC operation.

Recovery state A state for an NSAPI in which duplicated received N‑PDUs shall be detected and discarded. The recovery state only applies to NSAPIs using acknowledged peer-to-peer LLC operation.

SAPI SAPI identifies the Service Access Point that the SN‑PDU is using at the LLC layer.

Segment number A sequence number assigned to SN‑UNITDATA PDUs carrying segments of an N‑PDU.

Send N‑PDU number The value to be assigned as the N‑PDU number to the next N‑PDU received from the SNDCP user by an NSAPI using acknowledged peer-to-peer LLC operation.

Send N‑PDU number (unacknowledged) The value to be assigned as the N‑PDU number to the next N‑PDU received from the SNDCP user by an NSAPI using unacknowledged peer-to-peer LLC operation.

SNDCP entity The SNDCP entity handles the service functions provided by the SNDCP layer. The SNDCP entity is temporary logical link identity specific.

SNDCP management entity The SNDCP management entity handles communication with SM sub-layer and controls the operation of the SNDCP entity.

SNDCP user Protocol entity that is using the services provided by the SNDCP layer. PDP entities and control entities, e.g., AT command interpreter, are the SNDCP users at the MS. Relay entity is the SNDCP user at the SGSN.

SNDCP XID block The collection of SNDCP XID parameters being negotiated. It is transferred by the LL‑XID and LL‑ESTABLISH primitives between SNDCP and LLC.

Refer to 3GPP TS 02.60 [2] for further GPRS definitions.

3.2 Abbreviations

In addition to abbreviations in 3GPP TS 01.04 [1], 3GPP TS 02.60 [2], and 3GPP TS 03.60 [3], the following abbreviations apply:

DCOMP Identifier of the user data compression algorithm used for the N‑PDU

F First segment indicator bit

GMM GPRS Mobility Management

IP Internet Protocol

LLC Logical Link Control

M More bit used to indicate the last segment of N‑PDU

N‑PDU Network Protocol Data Unit

NSAPI Network Layer Service Access Point Identifier

P Propose bit

PCOMP Identifier of the protocol control information compression algorithm used for the N‑PDU

PDP Packet Data Protocol e.g., IPv4 or IPv6

PDU Protocol Data Unit

PTP Point to Point

QoS Quality of Service

SAPI Service Access Point Identifier

SDU Service Data Unit

SGSN Serving GPRS Support Node

SM Session Management

SNDCP Subnetwork Dependent Convergence Protocol

SNSM SNDCP-SM

TCP Transmission Control Protocol

TLLI Temporary Logical Link Identifier

X Spare bit