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Content for  TR 43.902  Word version:  16.0.0

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0  IntroductionWord‑p. 6

During the course of Release 6, TS 43.318 (Generic access to the A/Gb interface; Stage 2) and TS 44.318 (Generic access to the A/Gb interface; Stage 3) were developed that provide access to the 3GPP core network using generic IP connection. Generic Access Networks, or GAN, is an extension of GSM/GPRS mobile services into the customer's premises that is achieved by tunnelling certain GSM/GPRS protocols between the customer's premises and the Core Network over broadband IP network, and relaying them through an unlicensed radio link inside the customer's premises. GAN is a complement to traditional GSM/GPRS radio coverage, used to enhance customer premises coverage, increase network capacity and potentially lower costs.
Early deployments of GAN are now ongoing. As part of the continuous process of optimizing their network to better meet customer demand a number of operators have indicated a need to further enhance the GAN system. Various goals for such enhancements are documented in section four of the present document. After presentation of the goals, the present document technical alternatives for how to implement such enhancements to GAN.
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1  ScopeWord‑p. 7

The present document contains the results of the feasibility study into the enhancements to Generic Access Networks or GAN. Considerations include overall requirements for enhancements, architectural requirements, evaluation of potential architectural solutions and alternative architectures.
The objective is to identify an architectural solution that best meets the requirements as specified in first section. The feasibility study shall also investigate mechanisms for selecting the most appropriate network domain to serve the user.
Existing solutions developed by the 3GPP should be reused as much as possible.
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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]
TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
TS 43.318: "Generic access to the A/Gb interface; Stage 2".
[3]
TR 44.318: "Generic Access (GA) to the A/Gb interface; Mobile GA interface layer 3 specification".
[4]
TS 24.008: "Mobile radio interface Layer 3 specification; Core network protocols; Stage 3".
[5]
TS 29.060: "General Packet Radio Service (GPRS); GPRS Tunnelling Protocol (GTP) across the Gn and Gp interface".
[6]
TS 23.060: "General Packet Radio Service (GPRS); Service description; Stage 2".
[7]
TS 23.078: "Customized Applications for Mobile network Enhanced Logic (CAMEL) Phase X; Stage 2".
[8]
TS 32.251: "Telecommunication management; Charging management; Packet Switched (PS) domain charging".
[9]
TS 24.007: "Mobile radio interface signalling layer 3; General aspects".
[10]
TS 33.107: "3G security; Lawful interception architecture and functions".
[11]
RFC 2784  (March 2000): "Generic Routing Encapsulation (GRE)".
[12]
TS 25.410: "UTRAN Iu interface: General aspects and principles".
[13]
TS 25.450: "UTRAN Iupc interface general aspects and principles".
[14]
TS 25.419: "UTRAN Iu-BC interface: Service Area Broadcast Protocol (SABP)".
[15]
TS 29.234: (v11.2.0) "3GPP system to Wireless Local Area Network (WLAN) interworking; Stage 3".
[16]
TS 25.412: "UTRAN Iu interface signalling transport".
[17]
TS 25.414: "UTRAN Iu interface data transport and transport signalling".
[18]
TS 25.415: "UTRAN Iu interface user plane protocols".
[19]
TS 26.071: "AMR speech Codec; General description".
[20]
TS 33.102: "3G Security; Security architecture".
[21]
TS 33.234: "3G security; Wireless Local Area Network (WLAN) interworking security".
[22]
TS 23.122: "Non-Access-Stratum (NAS) functions related to Mobile Station (MS) in idle mode".
[23]
TS 25.331: "Radio Resource Control (RRC); Protocol specification".
[24]
TS 44.064: "Mobile Station - Serving GPRS Support Node (MS-SGSN); Logical Link Control (LLC) Layer Specification".
[25]
TS 44.065: "Mobile Station (MS) - Serving GPRS Support Node (SGSN); Subnetwork Dependent Convergence Protocol (SNDCP)".
[26]
TS 23.003: "Numbering, addressing and identification".
[27]
TS 23.236: "Intra-domain connection of Radio Access Network (RAN) nodes to multiple Core Network (CN) nodes".
[28]
TS 43.129: "Packed-switched handover for GERAN A/Gb mode; Stage 2".
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3  Definitions, symbols and abbreviationsWord‑p. 8

3.1  Definitions

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.

3.2  Symbols

For the purposes of the present document, the following symbols apply:
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Interface between UE and GANC

3.3  Abbreviations

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
AAA
Authentication, Authorization and Accounting
AKA
Authentication and Key Agreement
AP
Access Point
AS
Access Stratum
BSC
Base Station Controller
BSS
Base Station Subsystem
BSSGP
Base Station System GPRS Protocol
BSSMAP
Base Station System Management Application Part
CC
Call Control
CGI
Cell Global Identification
CM
Connection Management
CN
Core Network
CS
Circuit Switched
DNS
Domain Name System
DTM
Dual Transfer Mode
EAP
Extensible Authentication Protocol
ETSI
European Telecommunications Standards Institute
FQDN
Fully Qualified Domain Name
GA-CSR
Generic Access - Circuit Switched Resources
GAN
Generic Access Network
GANC
Generic Access Network Controller
GA-PSR
Generic Access - Packet Switched Resources
GA-RC
Generic Access - Resource Control
GA-RRC
Generic Access - Radio Resource Control
GERAN
GSM EDGE Radio Access Network
GGSN
Gateway GPRS Support Node
GMM/SM
GPRS Mobility Management and Session Management
GPRS
General Packet Radio Service
GSM
Global System for Mobile communications
GSN
GPRS Support Node
HLR
Home Location Register
HPLMN
Home PLMN
IETF
Internet Engineering Task Force
IKE
Internet Key Exchange
IMEISV
International Mobile station Equipment Identity and Software Version number
IMSI
International Mobile Subscriber Identity
IP
Internet Protocol
LA
Location Area
LAI
Location Area Identity
LLC
Logical Link Control
MAC
Medium Access Control
MAC
Message Authentication Code
MM
Mobility Management
MS
Mobile Station
MSC
Mobile Switching Center
MTP1
Message Transfer Part layer 1
MTP2
Message Transfer Part layer 2
MTP3
Message Transfer Part layer 3
NAS
Non-Access Stratum
PDP
Packet Data Protocol
PDU
Protocol Data Unit
PLMN
Public Land Mobile Network
PSTN
Public Switched Telephone Network
P-TMSI
Packet - TMSI
QoS
Quality of Service
RA
Routing Area
RAC
Routing Area Code
RAI
Routing Area Identity
RAT
Radio Access Technology
RLC
Radio Link Control
RTCP
Real Time Control Protocol
RTP
Real Time Protocol
SCCP
Signalling Connection Control Part
SEGW
SEcurity GateWay
SGSN
Serving GPRS Support Node
SIM
Subscriber Identity Module
SMLC
Serving Mobile Location Center
SMS
Short Message Service
SNDCP
Sub-Network Dependent Convergence Protocol
TBF
Temporary Block Flow
TC
Transport Channel
TCP
Transmission Control Protocol
TFO
Tandem Free Operation
TMSI
Temporary Mobile Subscriber Identity
TrFO
Transcoder Free Operation
TTY
Text Telephone or TeletYpewriter
UDP
User Datagram Protocol
UMTS
Universal Mobile Telecommunication System
VLR
Visited Location Register
VPLMN
Visited Public Land Mobile Network
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4  RequirementsWord‑p. 10

4.1  Objectives

  1. GAN Enhancements shall be backwards compatible with GAN in 3GPP Rel-6 and Rel-7.
    Two levels of enhancements may be considered that are either:
    1. Forwards compatible from Rel-6: Rel-6 and Rel-7 terminals work with the enhancements i.e. network-only enhancements
    2. Not forwards compatible from Rel-6 (respectively Rel-7): Rel-6 (respectively Rel-7) terminals do not work with the enhancements
    GAN Enhancements shall:
    • Support at minimum the same services as GAN in 3GPP Rel-6 and Rel-7; and
    • Support existing QoS management as specified in 3GPP; and
    • Minimize the impact on the Core Network.
  2. GAN Enhancements shall abide as per the unchanged GAN principle to keep the transparent support for any given service between UTRAN or GERAN, and GAN.
    • E.g. preserve the existing APN mechanism.
      1. GAN Enhancements shall minimize the additional complexity on existing GANCs if applicable.
      2. GAN Enhancements shall minimize the additional complexity on terminals (see case 1b above).
      3. GAN Enhancements shall reduce the complexity for delivery of CS and PS services.
    • E.g. by reducing the number of functions and/or protocol overhead.
  3. GAN Enhancements shall reduce the user-plane latency for delivery of PS services.
    • E.g. by reducing the number of functions and/or protocol overhead.
  4. GAN Enhancements shall be compatible / shall align with other 3GPP Core Network enhancements e.g. "one tunnel approach" for PS services.
  5. GAN Enhancements shall overcome the limitations imposed by using the Gb interface.
  6. GAN Enhancements shall provide optimized support for operators using GSM-only, UMTS-only, or combined GSM/UMTS networks.
    • E.g. no changes to existing core network nodes/interfaces.
  7. GAN Enhancements shall provide seamless mobility for CS and seamless mobility for PS including PS conversational services.
  8. GAN Enhancements shall minimize "Enhanced GAN mode" power consumption on handsets.
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4.2  BenefitsWord‑p. 11

The following items constitute a non-exhaustive list of benefits that may characterize the proposals on GAN Enhancements:
  • PS Optimization independent of CS Changes.
  • Support the services/network deployed with GPRS APNs.
  • No impact on TS 24.008.
  • Minimize the load on existing network elements (e.g. HLR).

4.3  For further investigation

The following items require further investigation:
  • Whether "Enhanced GAN" Terminals shall support GAN specified in 3GPP Rel-6 and Rel-7.
  • Whether there is any limitations induced by LLC protocol.

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