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Content for  TS 44.056  Word version:  16.0.0

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1  ScopeWord‑p. 10

The present document specifies the procedures used at the CTS radio interface (Reference Point Um*, see GSM 03.56) for Call Control (CC), Mobility Management (MM), Radio Resource (RR).
When the notations for "further study" or "FS" or "FFS" are present in the present document they mean that the indicated text is not a normative portion of the present document.
These procedures are defined in terms of messages exchanged over the control channels of the radio interface. The CTS control channels are described in GSM 03.52.
The structured functions and procedures of this protocol and the relationship with other layers and entities are described in general terms in GSM 04.07.
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1.1  Scope of the Technical Specification

The procedures currently described in the present document are for the call control of circuit-switched connections, mobility management and radio resource management for circuit-switched services over the CTS radio interface.
GSM 04.10 contains functional procedures for support of supplementary services.
GSM 04.11 contains functional procedures for support of point-to-point short message services.
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1.2  Application to the interface structures

The layer 3 procedures apply to the interface structures defined in GSM 04.03. They use the functions and services provided by layer 2 defined in GSM 04.05 and GSM 04.06. GSM 04.07 gives the general description of layer 3 including procedures, messages format and error handling.

1.3  Structure of layer 3 procedures

A building block method is used to describe the layer 3 procedures.
The basic building blocks are "elementary procedures" provided by the protocol control entities of the three sublayers, i.e. radio resource management, mobility management and connection management sublayer.
Complete layer 3 transactions consist of specific sequences of elementary procedures. The term "structured procedure" is used for these sequences.

1.4  Test procedures

Test procedures of the GSM-CTS radio interface signalling are described in GSM 11.10 and GSM 11.56 series.

1.5  Use of logical channels

The logical control channels are defined in GSM 03.52. In the following those control channels are considered which carry signalling information or specific types of user packet information: [to be completed]:
  1. CTS Beacon CHannel (CTSBCH): downlink only, used to broadcast Cell specific information and fixed part identification information;
  2. CTS Paging CHannel (CTSPCH): downlink only, used to send page requests to Mobile Stations (MSs);
  3. CTS Access Random CHannel (CTSARCH): uplink only, used to request a Dedicated Control CHannel;
  4. CTS-Access Grant CHannel (CTSAGCH): downlink only, used to allocate a Dedicated Control CHannel;
  5. Fast Associated Control CHannel (FACCH): bi-directional, associated with a Traffic CHannel;
    vi) Slow Associated Control CHannel (SACCH): bi-directional, associated with a Traffic CHannel;
Two service access points are defined on signalling layer 2 which are discriminated by their Service Access Point Identifiers (SAPI) (see GSM 04.06):
  1. SAPI 0: supports the transfer of signalling information including user-user information;
  2. SAPI 3: supports the transfer of user short messages.
Layer 3 selects the service access point, the logical control channel and the mode of operation of layer 2 (acknowledged, unacknowledged or random access, see GSM 04.05 and GSM 04.06) as required for each individual message.
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1.6  Overview of control proceduresWord‑p. 11

1.6.1  List of procedures

The following procedures are specified in the present document:
  1. Clause 4 specifies elementary procedures for Radio Resource management:
  2. Clause 5 specifies elementary procedures for CTS-Mobility Management:
  3. mobility management common procedures (subclause 5.2):
  4. mobility management specific procedures (subclause 5.3):
  5. Clause 6 specifies CTS specific elementary procedure for circuit switched Call Control:
  6. signalling procedures during the active state:
The elementary procedures can be combined to form structured procedures. Examples of such structured procedures are given in clause 7. This part of the Technical Specification is only provided for guidance to assist implementations.
Clause 8 specifies actions to be taken on various error conditions and also provides rules to ensure compatibility with future enhancements of the protocol.
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1.7  Applicability of implementationsWord‑p. 12

The applicability of procedures of the present document for the mobile station is dependent on the services and functions which are to be supported by a mobile station.

2  References

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]
GSM 01.02: "Digital cellular telecommunications system (Phase 2+); General description of a GSM Public Land Mobile Network (PLMN)".
[2]
GSM 01.04: "Digital cellular telecommunications system (Phase 2+); Abbreviations and acronyms".
[3]
GSM 02.02: "Digital cellular telecommunications system (Phase 2+); Bearer Services (BS) supported by a GSM Public Land Mobile Network (PLMN)".
[4]
GSM 02.03: "Digital cellular telecommunications system (Phase 2+); Teleservices supported by a GSM Public Land Mobile Network (PLMN)".
[5]
GSM 02.09: "Digital cellular telecommunications system (Phase 2+); Security aspects".
[6]
GSM 02.11: "Digital cellular telecommunications system (Phase 2+); Service accessibility".
[7]
GSM 02.17: "Digital cellular telecommunications system (Phase 2+); Subscriber Identity Modules (SIM); Functional characteristics".
[8]
GSM 02.40: "Digital cellular telecommunications system (Phase 2+); Procedures for call progress indications".
[9]
GSM 03.01: "Digital cellular telecommunications system (Phase 2+); Network functions".
[10]
GSM 03.03: "Digital cellular telecommunications system (Phase 2+); Numbering, addressing and identification".
[11]
GSM 03.13: "Digital cellular telecommunications system (Phase 2+); Discontinuous Reception (DRX) in the GSM system".
[12]
GSM 03.14: "Digital cellular telecommunications system (Phase 2+); Support of Dual Tone Multi Frequency signalling (DTMF) via the GSM system".
[13]
GSM 03.20: "Digital cellular telecommunications system (Phase 2+); Security related network functions".
[14]
GSM 03.22: "Digital cellular telecommunications system (Phase 2+); Functions related to Mobile Station (MS) in idle mode and group receive mode".
[15]
GSM 04.02: "Digital cellular telecommunications system (Phase 2+); GSM Public Land Mobile Network (PLMN) access reference configuration".
[[16]
GSM 04.03: "Digital cellular telecommunications system (Phase 2+); Mobile Station - Base Station System (MS - BSS) interface; Channel structures and access capabilities".
[17]
GSM 04.04: "Digital cellular telecommunications system (Phase 2+); Layer 1; General requirements".
[18]
GSM 04.05: "Digital cellular telecommunications system (Phase 2+); Data Link (DL) layer; General aspects".
[19]
GSM 04.06: "Digital cellular telecommunications system (Phase 2+); Mobile Station - Base Station System (MS - BSS) interface; Data Link (DL) layer specification".
[20]
GSM 04.07: "Digital cellular telecommunications system (Phase 2+); Mobile radio interface signalling layer 3; General aspects".
[21]
GSM 04.10: "Digital cellular telecommunications system (Phase 2+); Mobile radio interface layer 3; Supplementary services specification; General aspects".
[22]
GSM 04.11: "Digital cellular telecommunications system (Phase 2+); Point-to-Point (PP) Short Message Service (SMS) support on mobile radio interface".
[23]
GSM 04.12: "Digital cellular telecommunications system (Phase 2+); Short Message Service Cell Broadcast (SMSCB) support on the mobile radio interface".
[24]
GSM 04.80: "Digital cellular telecommunications system (Phase 2+); Mobile radio interface layer 3 supplementary services specification; Formats and coding".
[25]
GSM 04.81: "Digital cellular telecommunications system (Phase 2+); Line identification supplementary services; Stage 3".
[26]
GSM 04.82: "Digital cellular telecommunications system (Phase 2+); Call Forwarding (CF) supplementary services; Stage 3".
[27]
GSM 04.83: "Digital cellular telecommunications system (Phase 2+); Call Waiting (CW) and Call Hold (HOLD) supplementary services; Stage 3".
[28]
GSM 04.84: "Digital cellular telecommunications system (Phase 2+); MultiParty (MPTY) supplementary services; Stage 3".
[29]
GSM 04.85: "Digital cellular telecommunications system (Phase 2+); Closed User Group (CUG) supplementary services; Stage 3".
[30]
GSM 04.86: "Digital cellular telecommunications system (Phase 2+); Advice of Charge (AoC) supplementary services; Stage 3".
[31]
GSM 04.88: "Digital cellular telecommunications system (Phase 2+); Call Barring (CB) supplementary services; Stage 3".
[32]
GSM 05.02: "Digital cellular telecommunications system (Phase 2+); Multiplexing and multiple access on the radio path".
[33]
GSM 05.05: "Digital cellular telecommunications system (Phase 2+); Radio transmission and reception".
[34]
GSM 05.08: "Digital cellular telecommunications system (Phase 2+); Radio subsystem link control".
[35]
GSM 05.10: "Digital cellular telecommunications system (Phase 2+); Radio subsystem synchronisation".
[36]
GSM 07.01: "Digital cellular telecommunications system (Phase 2+); General on Terminal Adaptation Functions (TAF) for Mobile Stations (MS)".
[37]
GSM 09.02: "Digital cellular telecommunications system (Phase 2+); Mobile Application Part (MAP) specification".
[38]
GSM 09.07: "Digital cellular telecommunications system (Phase 2+); General requirements on interworking between the Public Land Mobile Network (PLMN) and the Integrated Services Digital Network (ISDN) or Public Switched Telephone Network (PSTN)".
[39]
GSM 11.10: "Digital cellular telecommunications system (Phase 2+); Mobile Station (MS) conformance specification".
[40]
GSM 11.21: "Digital cellular telecommunications system (Phase 2+); Base Station System (BSS) equipment specification".
[41]
ISO/IEC 646 (1991): "Information technology - ISO 7-bit coded character set for information interchange".
[42]
ISO/IEC 6429: "Information technology - Control functions for coded character sets".
[43]
ISO 8348 (1987) (Addendum 2): "Information processing systems - Data communications - Network service definition".
[44]
ITU-T Recommendation E.163: "Numbering plan for the international telephone service".
[45]
ITU-T Recommendation E.164: "The international public telecommunication numbering plan".
[46]
ITU-T Recommendation E.212: "The international identification plan for mobile terminals and mobile users".
[47]
ITU-T Recommendation F.69 (1993): "The international telex service - Service and operational provisions of telex destination codes and telex network identification codes".
[48]
ITU-T Recommendation I.330: "ISDN numbering and addressing principles".
[49]
ITU-T Recommendation I.440 (1989): "ISDN user-network interface data link layer - General aspects".
[50]
ITU-T Recommendation I.450 (1989): "ISDN user-network interface layer 3 - General aspects".
[51]
ITU-T Recommendation I.500 (1993): "General structure of the ISDN interworking recommendations".
[52]
ITU-T Recommendation T.50: "International Reference Alphabet (IRA) (Formerly International Alphabet No. 5 or IA5) - Information technology - 7-bit coded character set for information interchange".
[53]
ITU-T Recommendation Q.931: "ISDN user-network interface layer 3 specification for basic control".
[54]
ITU-T Recommendation V.21: "300 bits per second duplex modem standardized for use in the general switched telephone network".
[55]
ITU-T Recommendation V.22: "1200 bits per second duplex modem standardized for use in the general switched telephone network and on point-to-point 2-wire leased telephone-type circuits".
[56]
ITU-T Recommendation V.22bis: "2400 bits per second duplex modem using the frequency division technique standardized for use on the general switched telephone network and on point-to-point 2-wire leased telephone-type circuits".
[57]
ITU-T Recommendation V.23: "600/1200-baud modem standardized for use in the general switched telephone network".
[58]
ITU-T Recommendation V.26ter: "2400 bits per second duplex modem using the echo cancellation technique standardized for use on the general switched telephone network and on point-to-point 2-wire leased telephone-type circuits".
[59]
ITU-T Recommendation V.32: "A family of 2-wire, duplex modems operating at data signalling rates of up to 9600 bit/s for use on the general switched telephone network and on leased telephone-type circuits".
[60]
ITU-T Recommendation V.110: "Support by an ISDN of data terminal equipments with V-Series type interfaces".
[61]
ITU-T Recommendation V.120: "Support by an ISDN of data terminal equipment with V-Series type interfaces with provision for statistical multiplexing".
[62]
ITU-T Recommendation X.21: "Interface between Data Terminal Equipment and Data Circuit terminating Equipment for synchronous operation on public data networks".
[63]
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".
[64]
ITU-T Recommendation X.28: "DTE/DCE interface for a start-stop mode Data Terminal Equipment accessing the Packet Assembly/Disassembly facility (PAD) in a public data network situated in the same country".
[65]
ITU-T Recommendation X.30: "Support of X.21, X.21 bis and X.20 bis based Data Terminal Equipments (DTEs) by an Integrated Services Digital Network (ISDN)".
[66]
ITU-T Recommendation X.31: "Support of packet mode terminal equipment by an ISDN".
[67]
ITU-T Recommendation X.32: "Interface between Data Terminal Equipment (DTE) and Data Circuit-terminating Equipment (DCE) for terminals operating in the packet mode and accessing a packet-switched public data network through a public switched telephone network or an integrated services digital network or a circuit-switched public data network".
[68]
ITU-T Recommendation X.75 (1988): "Packet-switched signalling system between public networks providing data transmission services".
[69]
ITU-T Recommendation X.121: "International numbering plan for public data networks".
[70]
ETSI ETS 300 102-1: "Integrated Services Digital Network (ISDN); User-network interface layer 3; Specifications for basic call control".
[71]
ETSI ETS 300 102-2: "Integrated Services Digital Network (ISDN); User-network interface layer 3; Specifications for basic call control; Specification Description Language (SDL) diagrams".
[72]
ISO/IEC 10646: "Information technology - Universal Multiple-Octet Coded Character Set (UCS)".
[73]
GSM 02.56: "Digital cellular telecommunications system (Phase 2+); GSM Cordless Telephony System (CTS), Phase 1; Service description; Stage 1".
[74]
GSM 03.56: "Digital cellular telecommunications system (Phase 2+); GSM Cordless Telephony System (CTS), Phase 1; CTS Architecture Description; Stage 2".
[75]
GSM 03.52: "Digital cellular telecommunications system (Phase 2+); GSM Cordless Telephony System (CTS), Phase 1; Lower Layers of the CTS Radio Interface; Stage 2".
[76]
GSM 04.08: "Digital cellular telecommunications system (Phase 2+); Mobile radio interface; Layer 3 specification".
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3  Definitions, abbreviations and Random valuesWord‑p. 16

3.1  Definitions

For the purposes of the present document, the terms and definitions given in GSM 04.08 and the following apply:
CTS-idle mode:
in this mode, the mobile station is not allocated any dedicated channel; it listens to the BCH and to the CCH when requested

3.2  Abbreviations

For the purposes of the present document, the abbreviations given in GSM 01.04 apply.

3.3  Random values

In a number of places in the present document, it is mentioned that some value must take a "random" value, in a given range, or more generally with some statistical distribution.
It is required that there is a low probability that two equipment's in the same conditions (including the case of two equipment's of the same type from the same manufacturer) will choose the same value. Moreover, it is required that, if it happens that two equipment's in similar conditions choose the same value, the probability of their choices being identical at the next occasion is the same as if their first choices had been different.
The meaning of such a specification is that any statistical test for these values, done on a series of similar events, will obtain a result statistically compatible with the specified distribution. This shall hold even in the cases where the tests are conducted with a subset of possible events, with some common parameters. Moreover, basic tests of independence of the values within the series shall pass.
Data against which correlation with the values shall not be found are the protocol state, or the IMSI, or identities or other unrelated information broadcast by the network, or the current TDMA frame number.
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