2 References
24.0223GPPRadio Link Protocol (RLP) for circuit switched bearer and teleservicesRelease 17TS
The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
– References are either specific (identified by date of publication, edition number, version number, etc.) or non‑specific.
– For a specific reference, subsequent revisions do not apply.
– For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1] Void.
[2] 3GPP TS 44.021: "Rate adaption on the Mobile Station – Base Station System (MS – BSS) interface".
[3] 3GPP TS 48.004: "Base Station System – Mobile services Switching Centre (BSS – MSC) interface Layer 1 specification".
[4] 3GPP TS 48.020: "Rate adaption on the Base Station System – Mobile services Switching Centre (BSS – MSC) interface".
[5] 3GPP TS 25.410: "UTRAN Iu interface: General Aspects and Principles".
[6] 3GPP TS 25.411: "UTRAN Iu interface Layer 1".
[7] 3GPP TS 25.414: "UTRAN Iu interface data transport and transport signalling".
[8] 3GPP TS 25.415: "UTRAN Iu interface user plane protocols".
[9] 3GPP TS 27.001: "General on Terminal Adaptation Functions (TAF) for Mobile Stations (MS)".
[10] 3GPP TS 27.002: "Terminal Adaptation Functions (TAF) for services using Asynchronous bearer capabilities".
[11] 3GPP TS 27.003: "Terminal Adaptation Functions (TAF) for services using Synchronous bearer capabilities".
[12] Void.
[13] 3GPP TS 29.007: "General requirements on interworking between the Public Land Mobile Network (PLMN) and the Integrated Services Digital Network (ISDN) or Public Switched Telephone Network (PSTN)".
[14] ITU-T Recommendation Q.920: "ISDN user-network interface data link layer – General aspects".
[15] ITU-T Recommendation Q.921: "ISDN user-network interface – Data link layer specification".
[16] ITU-T Recommendation Q.921bis: "Abstract test suite for LAPD conformance testing".
[17] ITU-T Recommendation Q.922: "ISDN data link layer specification for frame mode bearer services".
[18] ITU-T Recommendation V.42bis: "Data compression procedures for Data Circuit-terminating Equipment (DCE) using error correction procedures".
[19] ITU-T Recommendation X.25: "Interface between Data Terminal Equipment (DTE) and Data Circuit-terminating Equipment (DCE) for terminals operating in packet mode and connected to public data networks by dedicated Circuit".
[20] ISO/IEC 4335: "Information technology – Telecommunications and information exchange between systems – High-level Data Link Control (HDLC) procedures – Elements of procedures".
[21] ISO/IEC 3309: "Information technology – Telecommunications and information exchange between systems – High-level Data Link Control (HDLC) procedures – Frame structure".
[22] ISO/IEC 7498: "Information technology – Open Systems Interconnection – Basic Reference Model".
[23] ISO/IEC 8885: "Information technology – Telecommunication and information exchange between systems – High-level Data Link Control (HDLC) procedures – General purpose XID frame information field content and format".
[24] ISO/IEC 8886: "Information technology – Open Systems Interconnection – Data link service definition".
[25] ISO/TR 8509: "Information processing systems – Open Systems Interconnection – Service conventions".
[26] ISO/IEC 7809: "Information technology – Telecommunications and information exchange between systems – High-level Data Link Control (HDLC) procedures – Classes of procedures".
[27] ISO/IEC 7776: "Information technology – Telecommunications and information exchange between systems – High-level data link control procedures – Description of the X.25 LAPB-compatible DTE data link procedures".
[28] 3GPP TR 21.905: "Vocabulary for 3GPP Specifications".
[29] 3GPP TS 43.051: "GSM/EDGE Radio Access Network (GERAN) overall description; Stage 2".
[30] ITU-T Recommendation X.25: "Interface between Data Terminal Equipment (DTE) and Data Circuit-terminating Equipment (DCE) for terminals operating in the packet mode and connected to public data networks by dedicated circuit".
2.1 Definitions and abbreviations
2.1.1 Abbreviations
For the purposes of the present document, the abbreviations given in 3GPP TR 21.905 [28] and the following apply:
ABM Asynchronous Balanced Mode
ADM Asynchronous Disconnected Mode
ATM Asynchronous Transfer Mode.
C/R Command/Response bit
DISC Disconnect frame
DM Disconnected Mode frame
DTX Discontinuous Transmission
FCS Frame Check Sequence
L2R Layer 2 Relay function
N(R) Receive sequence number
N(S) Send sequence number
NULL Null information frame
P/F Poll/Final bit
REJ Reject frame
REMAP Remap frame
RLP Radio Link Protocol
RNR Receive Nor ready frame
RR Receive Ready frame
SABM Set Asynchronous Balanced Mode frame
SREJ Selected reject frame
STM Synchronous Transfer Mode
TEST Test frame
UA Unnumbered Acknowledge frame
UI Unnumbered Information frame
XID Exchange Identification frame
2.1.2 Definitions
For the purposes of the present document, the following terms and definitions apply:
A/Gb mode: system or a subsystem operates in A/Gb mode if an A or Gb interface is used between the radio access network and the core network.
backwards compatibility: RLP defines several backwards-compatible versions. That means that a newer version can interwork with an older one without changing the older one. This is realized by a fall back mechanism during XID exchange.
command: instruction represented in the RLP header, causing the receiving RLP entity to execute a specific function.
frame check sequence: field of redundant information based on a cyclic code, used for error detection.
I + S frame: RLP frame that is used for user information transfer, carrying supervisory information piggyback.
improper frame: RLP frame having an FCS error or having a header the contents of which is inconsistent with the present document.
Iu mode: system or a subsystem operates in Iu mode if an Iu-CS or Iu-PS interface is used between the radio access network and the core network. It operates in UTRAN Iu mode if UTRAN is used as radio access network. It operates in GERAN Iu mode if GERAN is used as radio access network.
non-transparent: in PLMN data transmission, a configuration where at layer 2, protocol information of the fixed network is mapped on RLP elements, and vice versa.
piggybacking: means by which one and the same frame can carry both user information and RLP related supervisory information.
response: reply represented in the RLP-header, by which the sending RLP entity reports back about its status.
RLP frame: sequence of contiguous bits, representing an RLP procedural element.
RLP header: that part of an RLP frame that encodes either a command or a response, located at the beginning of the RLP frame.
S frame: RLP frame that contains supervisory information in the absence of user information.
transparent: in PLMN data transmission, a configuration where at layer 2 (and also at the layers above) no protocol conversion takes place.
U frame: RLP frame that contains unnumbered protocol control information.