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Content for  TS 48.016  Word version:  16.0.0

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1  ScopeWord‑p. 7

The present document specifies the Network Service used on the Base Station System (BSS) to Serving GPRS Support Node (SGSN) interface (Gb interface).
The protocol stack on the Gb interface is defined in the stage 2 Technical Specification TS 23.060.
The Network Service entity provides network services to the BSSGP entity specified in TS 48.018.
The layer 1 of the Gb interface is specified in TS 48.014.
In the present document, the communication between adjacent layers and the services provided by the layers are distributed by use of abstract service primitives. But only externally observable behaviour resulting from the description is normatively prescribed by the present document.
The service primitive model used in the present document is based on the concepts developed in ITU-T Recommendation X.200.
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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 22.060: "General Packet Radio Service (GPRS); Service description; Stage 1".
[3]
TS 23.060: "General Packet Radio Service (GPRS); Service description; Stage 2".
[4]
TS 48.014: "General Packet Radio Service (GPRS); Base Station System (BSS) Serving GPRS Support Node (SGSN) interface; Gb interface Layer 1".
[5]
TS 48.018: "General Packet Radio Service (GPRS); Base Station System (BSS) - Serving GPRS Support Node (SGSN); BSS GPRS Protocol (BSSGP)".
[6]
FRF 1.1 (1996): "User-to-Network Implementation Agreement (UNI)".
[7]  (void).
[8]
ITU T Recommendation Q.921 (1997): "ISDN user-network interface - Data link layer specification".
[9]
ITU T Recommendation Q.922 (1992): "ISDN data link layer specification for frame mode bearer services".
[10]
ITU T Recommendation Q.931 (1998): "ISDN user-network interface layer 3 specification for Basic Call Control".
[11]
ITU T Recommendation Q.933 (1995): "Digital Subscriber Signalling System No. 1 (DSS 1) Signalling specifications for frame mode switched and permanent virtual connection control and status monitoring".
[12]
ITU T Recommendation I.370 (1991): "Congestion management for the ISDN Frame Relaying Bearer Service".
[13]
ITU-T Recommendation X.200 (White Book): "Information technology - Open Systems Interconnection - Basic Reference Model: The basic model".
[14]
ANSI T1.602: "ISDN - Data Link Layer Signalling Specification for Application at the User Network Interface".
[15]
ANSI T1.606 (1990): "Frame Relaying Bearer Service Architectural Framework and Service description (R 1996)".
[16]
ANSI T1.617 (1991): "Digital Subscriber System No. 1 (DSS1) Signaling Specification for Frame Relay Bearer Service (R1997)".
[17]
ANSI T1.618 (1991): "Digital Subscriber System No. 1 (DSS1) Core Aspects of Frame Relay Protocol for Use with Frame Relay Bearer Service (R1997)".
[18]
RFC 768  (1980): "User Datagram Protocol" (STD 6).
[19]
RFC 791  (1981): "Internet Protocol" (STD 5).
[20]
RFC 2460  (1998): "Internet Protocol, Version 6 (IPv6) Specification".
[21]
TS 23.236: "Intra-domain connection of Radio Access Network (RAN) nodes to multiple Core Network (CN) nodes".
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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 TS 22.060 and the following in apply:
BSSGP Virtual Connection (BVC):
end-to-end virtual communication path between remote Network Service user entities
BSSGP Virtual Connection Identifier (BVCI):
identifier of a BVC, having end-to-end significance across the Gb interface
IP endpoint:
an endpoint defined by its IP address and UDP port. An IP endpoint can be a data endpoint and/or a signalling endpoint
Data IP endpoint:
an IP endpoint used for Data traffic
Signalling IP endpoint:
an IP endpoint used for Signalling traffic
Data traffic:
data traffic for an IP Sub-Network is defined as NS SDUs for PTP and PTM functional entities (BVCI≥1)
Signalling traffic:
signalling traffic for an IP Sub-Network is defined as NS SDUs for Signalling functional entities (BVCI=0) and all PDUs for IP Sub-Network Service Control
Full Mesh Connectivity:
any IPv4 endpoint in an NSE is capable of communications with any IPv4 endpoint in its peer NSE. Also any IPv6 endpoint in an NSE is capable of communications with any IPv6 endpoint in its peer NSE
Network Service Entity Identifier (NSEI):
identifier of an NS Entity having end-to-end significance across the Gb interface, i.e. the peer NSEs on the BSS side and the SGSN side are identified by the same NSEI value
Network Service Virtual Connection (NS-VC):
end-to-end virtual communication path between Network Service peer entities
Network Service Virtual Connection Identifier (NS-VCI):
identifier of an NS-VC having end-to-end significance across the Gb interface
Network Service Virtual Link (NS-VL):
virtual communication path between the BSS or the SGSN and the intermediate network, or between the BSS and the SGSN in case of direct point-to-point configuration
Network Service Virtual Link Identifier (NS-VLI):
identifier of an NS-VL, having local significance at the BSS or SGSN
Network Service Virtual Connection Group:
groups all NS-VCs together which provide communication between the same peer NS entities. This grouping has local significance at the BSS or SGSN
Blocked / unblocked:
when an NS-VC can not be used for NS user traffic, it is blocked. When an NS-VC can be used for NS user traffic, it is unblocked
Dead / alive:
when an NS-VC is able to provide communication between remote NS entities, it is alive. When it is not able, it is dead. These states are supervised by means of a test procedure, as further described in the present document
Pool area:
an area within which an MS may roam without need to change the serving SGSN. A pool area is served by one or more SGSNs in parallel. All the cells controlled by a BSC belong to the same one (or more) pool area(s).
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3.2  SymbolsWord‑p. 9

For the purposes of the present document, the symbols given in TS 23.060 apply.

3.3  Abbreviations

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply:
BECN
Backward Explicit Congestion Notification
BSSGP
Base Station System GPRS Protocol
BVC
BSSGP Virtual Connection
BVCI
BSSGP Virtual Connection Identifier
CLLM
Consolidated Link Layer Management
DE
Discard Eligibility
FECN
Forward Explicit Congestion Notification
FR
Frame Relay
FRF
Frame Relay Forum
IP
Internet Protocol
IPv4
Internet Protocol version 4
IPv6
Internet Protocol version 6
LLC
Logical Link Control
LSP
Link Selector Parameter
MAC
Medium Access Control
NS
Network Service
NSEI
Network Service Entity Identifier
NS-SAP
Network Service Service Access Point
NS-VC
Network Service Virtual Connection
NS-VCI
Network Service Virtual Connection Identifier
NS-VL
Network Service Virtual Link
NS-VLI
Network Service Virtual Link Identifier
PDU
Protocol Data Unit
PTM
Point-To-Multipoint
PTP
Point-To-Point
PVC
Permanent Virtual Connection
RLC
Radio Link Control
SGSN
Serving GPRS Support Node
SNS
Sub-Network Service
UDP
User Datagram Protocol
UNI
User-to-Network Interface
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