3 Definitions and abbreviations

04.643GPPGeneral Packet Radio Service (GPRS)Mobile Station - Serving GPRS Support Node (MS-SGSN) Logical Link Control (LLC) layer specificationTS

3.1 Definitions

For the purposes of the present document the following terms and definitions apply. Additional applicable definitions can be found in 3GPP TS 02.60 [3].

frame rejection condition: a condition that results from the receipt of an undefined or incorrect frame.

inquiry process: a process performed in the peer receiver busy condition in which the LLE checks that the peer LLE is still in the own receiver busy condition.

invalid frame condition: a condition that results from the receipt of an invalid frame.

logical link connection: the logical connection between two LLE peers. A logical link connection is identified with a Data Link Connection Identifier (DLCI). A logical link connection is always in one of three states: TLLI Unassigned, TLLI Assigned / ADM, or ABM.

logical link control layer: the protocol layer between an MS and an SGSN consisting of one or more logical link management entities, one or more logical link entities, and a multiplex procedure.

logical link entity: the LLC layer protocol state machine controlling one logical link connection.

own receiver busy condition: a condition that results from the inability to accept additional I frames from the peer logical link entity.

peer receiver busy condition: a condition that results from the reception in of a RNR frame from the peer logical link entity.

3.2 Abbreviations

For the purposes of the present document, the following abbreviations apply. Additional applicable abbreviations and symbols can be found in 3GPP TS 01.04 [1] and 3GPP TS 03.60.

ABM Asynchronous Balanced Mode

ACK ACKnowledgement

ADM Asynchronous Disconnected Mode

CNF Confirm

DISC DISConnect

DM Disconnected Mode

FRMR FRaMe Reject

GMM GPRS Mobility Management

GRR GPRS Radio Resources service access point

I Information

IOV Input Offset Value

IND Indication

LAPD Link Access Procedure on the D-channel

LL Logical Link

LLC Logical Link Control

LLE Logical Link Entity

LLGMM LLC to GPRS Mobility Management service access point

LLM Logical Link Management

LLME Logical Link Management Entity

REQ Request

RES Response

RNR Receive Not Ready

RR Receive Ready

S Supervisory

SABM Set Asynchronous Balanced Mode

SACK Selective ACKnowledgement

TIA Telecommunications Industry Association

UA Unnumbered Acknowledgement

UI Unconfirmed Information

XID eXchange IDentification