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Content for  TR 43.901  Word version:  16.0.0

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0  IntroductionWord‑p. 5

This document captures the results of the feasibility study of enabling generic access to A/Gb interface using alternate access means such as ADSL, Cable, Bluetooth, etc. Mobile stations obtain services from the GSM core network using such generic access means rather than through the traditional GERAN radio interface. The goal is to ensure no impact to the current A/Gb interface specifications.

1  ScopeWord‑p. 6

This document studies the feasibility of generic access to A/Gb interface. Specific areas of study are:
  • Architecture to enable generic access.
  • Access interface protocols required to provide connectivity to A/Gb interface and GSM/GPRS services.
  • Security mechanisms to support generic access architecture.
  • Determining feasibility for support of services currently supported through GERAN.
The focus of the study shall be on establishing the feasibility for supporting generic access in the home network case, while also identifying issues with extending the solution to the roaming scenarios.
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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]
TS 22.011: "Service accessibility".
[2]
TS 23.234: "3GPP system to Wireles Local Area Network (WLAN) interworking; System description".
[3]
TS 26.103: "Speech codec list for GSM and UMTS".
[4]
ITU T Recommendation V.110: "Support by an ISDN of data terminal equipments with V-Series type interfaces".
[5]
RFC 791:  "Internet Protocol".
[6]
RFC 793:  "Transmission Control Protocol".
[7]
RFC 2406:  "IP Encapsulating Security Payload (ESP)".
[8]
IKEv2
[9]
EAP SIM
[10]
IPSec NAT
[11]
RFC 768:  "User Datagram Protocol".
[12]
RFC 3550:  "A Transport Protocol for Real-Time Applications".
[13]
TS 33.234: "3G security; Wireless Local Area Network (WLAN) interworking security".
[14]
RFC 2406:  " IP Encapsulating Security Payload (ESP)".
[15]
TS 23.122: "Non-Access-Stratum functions related to Mobile Station (MS) in idle mode".
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3  Definitions, symbols and abbreviationsWord‑p. 7

3.1  Definitions

For the purposes of the present document, the following terms and definitions apply.
Generic Access Network:
an access network providing access to A/Gb interfaces using broadband IP network.
Generic Access Network Controller:
the network node that connects to the MSC and SGSN via the A-interface and Gb interface respectively and mimics the functionality of the GERAN BSS.
Roving:
the action of re-selection between 3GPP access technology and GAN for a mobile station in idle mode.
Rove in:
the mobile station reselects from GERAN/UTRAN to GAN.
Rove out:
the mobile station reselects from GAN to GERAN/UTRAN.
Handover:
a mobile station engaged in a call moves between GERAN/UTRAN and GAN.
Handover in:
the mobile station moves from GERAN/UTRAN to GAN.
Handover out:
the mobile station moves from GAN to GERAN/UTRAN.
Seamless:
free from noticeable transitions (i.e., no end-user action is required; speech interruptions are short; service interruptions are short; incoming calls are not missed; packet sessions are maintained; services work identically).
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3.2  Symbols

For the purposes of the present document, the following symbols apply:
A
GSM A Interface: the A interface is located between the MSC (Mobile service Switching Centre) and the BSS (Base station system or radio Sub-System).
Gb
GSM Gb Interface: the Gb interface connects the Base Station System (BSS) to the Serving GPRS Support Node (SGSN)
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Interface between MS and GAN
Wm
Reference point between a Packet Data Gateway and a 3GPP AAA Server or 3GPP AAA proxy

3.3  Abbreviations

For the purposes of the present document, the following abbreviations apply:
A-GPS
Assisted-GPS
AAA
Authentication, Authorisation and Accounting
ADSL
Asymmetric Digital Subscriber Line
ARFCN
Absolute Radio Frequency Channel Number
BCCH
Broadcast Control CHannel
BSIC
Base transceiver Station Identity Code
BSS
Base Station Subsystem
BSSAP
Base Station Subsystem Application Part
BSSGP
Base Station Subsystem GPRS Protocol
BSSMAP
Base Station Subsystem Management Application Part
CBS
Cell Broadcast Service
CC
Call Control
CGI
Cell Global Identity
CI
Cell Identity
CM
Connection Management
CN
Core Network
CS
Circuit Switched
DSL
Digital Subscriber Line
DTAP
Direct Transfer Application Part
DTM
Dual Transfer Mode
ESP
Encapsulating Security Payload
FFS
For Further Study
GAN
Generic Access Network
GANC
Generic Access Network Controller
GERAN
GSM EDGE Radio Access Network
GMM
GPRS Mobility Management
GMMRR
GPRS Mobility Management Radio Resource
GRR
GPRS Radio Resource
HLR
Home Location Register
HO
Handover
HPLMN
Home Public Land Mobile Network
HTTP
Hyper Text Transfer Protocol
IMS
IP Multimedia Subsystem
IMSI
International Mobile Subscriber Identity
IP
Internet Protocol
L1
Layer 1 (physical layer)
LA
Location Area
LA
Location Area Identity
LCS
Location Services
LLC
Logical Link Control
MAC
Medium Access Control (protocol layering context)
MBMS
Multimedia Broadcast and Multicast Service
MM
Man Machine
MMI
Man Machine Interface
MMS
Multimedia Messaging Service
MO
Mobile Originated
MS
Mobile Station
MSC
Mobile Switching Centre
MVNO
Mobile Virtual Network Operator
NACC
Network Assisted Cell Change
NAS
Non-Access Stratum
NC2
Network Control mode 2
OTDOA
Observed Time Difference Of Arrival (positioning method)
PCM
Pulse Code Modulation
PDP
Packet Data Protocol
PDU
Protocol Data Unit
PLMN
Public Land Mobile Network
PS
Packet Switched
RAN
Radio Access Network
RR
Radio Resources
RRC
Radio Resource Control
RTCP
Real-Time Transport Control Protocol
RTP
Real Time Protocol
SAP
Service Access Point
SAPI
Service Access Point Identifier
SCCP
Signalling Connection Control Part
SGW
Security Gateway
SGSN
Serving GPRS Support Node
SID
SIlence Descriptor
SIM
GSM Subscriber Identity Module
SM
Session Management
SMS
Short Message Service
SS
Supplementary Service
SSL
Secure Sockets Layer
TBF
Temporary Block Flow
TCP
Transmission Control Protocol
TFO
Tandem Free Operation
TLLI
Temporary Logical Link Identity
TMSI
Temporary Mobile Subscriber Identity
TrFO
Transcoding Free Operation
UDP
User Datagram Protocol
UNC
Universal Naming Convention
UTRAN
Universal Terrestrial Radio Access Network
VBS
Voice Broadcast Service
VGCS
Voice Group Call Service
VPLMN
Visited Public Land Mobile Network
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4  Assumed high level requirementsWord‑p. 9

This clause summarizes the various assumed requirements for the feasibility study, when providing generic access to A/Gb interfaces:
  • GAN interfaces to the core network shall use existing standard A interface to the MSC and Gb interface to the SGSN. Non-access stratum (NAS) protocols shall not be impacted.
  • GAN shall reuse the existing GERAN identifiers toward the core network.
  • GAN should support all telecommunication services supported using the A/Gb interfaces.
  • GAN shall be able to operate over existing generic IP access networks (e.g. Cable, DSL, etc.). GAN-specific functionality shall not be required in the generic IP access network.
  • Multi-mode terminals shall be able to perform automatic roving between GERAN/UTRAN and GAN, subject to the policies of the operator.
  • Multi-mode terminals shall be able to perform seamless handover between GERAN/UTRAN and GAN, subject to the policies of the operator.
  • PLMN selection and mechanisms for the avoidance of ping-pong between GERAN/UTRAN and GAN modes shall follow the principles enunciated in TS 22.011.
  • The home operator providing GAN service shall control access to Generic Access in all scenarios, including roaming.
  • GAN shall provide security at least as good as GERAN for all traffic between mobile station and GANC. This includes support of bilateral authentication and encryption of all signalling and user plane traffic between mobile station and GANC.
  • GAN should not require any change to existing standards e.g. the behaviour of MS in GERAN. Non-GAN capable MSs shall not be impacted due to GAN deployment.
  • GAN shall be easily scaled with increasing users and traffic. It should efficiently use the resources of the generic IP access network.
  • Existing charging mechanisms should be used for GAN.
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