SIST ES 282 004 V3.4.1:2014

SLOVENSKI STANDARD
SIST ES 282 004 V3.4.1:2014
01-julij-2014

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Networking (TISPAN) - NGN Functional Architecture - Network Attachment Sub-System

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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Intellectual Property Rights ................................................................................................................................ 5

Foreword ............................................................................................................................................................. 5

1 Scope ........................................................................................................................................................ 6

2 References ................................................................................................................................................ 6

2.1 Normative references ......................................................................................................................................... 6

2.2 Informative references ........................................................................................................................................ 7

3 Definitions and abbreviations ................................................................................................................... 7

3.1 Definitions .......................................................................................................................................................... 7

3.2 Abbreviations ..................................................................................................................................................... 7

4 General Description of NASS .................................................................................................................. 8

4.1 High level functional overview .......................................................................................................................... 8

4.2 High level concepts of NASS ............................................................................................................................. 9

4.3 Mobility, Nomadism .......................................................................................................................................... 9

4.4 Access network level registration ....................................................................................................................... 9

4.4.1 Implicit authentication ................................................................................................................................ 10

4.4.1.1 Line authentication ................................................................................................................................ 10

4.4.2 Explicit authentication ................................................................................................................................ 10

4.4.3 CNG remote network configuration ........................................................................................................... 10

4.4.4 TISPAN NGN Service/Applications Subsystems discovery ...................................................................... 10

5 Functional Architecture .......................................................................................................................... 11

5.1 Overview .......................................................................................................................................................... 11

5.2 Functional Entities ............................................................................................................................................ 12

5.2.1 Network Access Configuration Function (NACF) ..................................................................................... 12

5.2.2 Void ............................................................................................................................................................ 12

5.2.3 Connectivity session Location and repository Function (CLF) .................................................................. 12

5.2.3.1 Information Model ................................................................................................................................ 13

5.2.3.2 State Model ........................................................................................................................................... 14

5.2.4 User Authentication and Authorization Function (UAAF) ......................................................................... 16

5.2.5 Profile Data Base Function (PDBF) ........................................................................................................... 16

5.2.6 CNG Configuration Function (CNGCF) ..................................................................................................... 17

5.2.7 Void ............................................................................................................................................................ 17

5.3 Internal Reference points .................................................................................................................................. 17

5.3.1 Void ............................................................................................................................................................ 17

5.3.2 Reference Point NACF - CLF (a2) ............................................................................................................. 17

5.3.2.1 Bind Indication ...................................................................................................................................... 17

5.3.2.2 Bind Acknowledgement ........................................................................................................................ 18

5.3.2.3 Unbind Indication ................................................................................................................................. 18

5.3.2.4 Bind Information Query ........................................................................................................................ 18

5.3.2.5 Bind Information Query Acknowledgement ......................................................................................... 18

5.3.3 Void ............................................................................................................................................................ 19

5.3.4 Reference Point UAAF - CLF (a4) ............................................................................................................. 19

5.3.4.1 Access Profile Push ............................................................................................................................... 19

5.3.4.2 Access Profile Pull ................................................................................................................................ 21

5.3.4.3 Remove Access Profile ......................................................................................................................... 21

5.3.5 Reference Point NACF - UAAF ................................................................................................................. 21

5.3.6 Reference Point UAAF - UAAF (e5) ......................................................................................................... 21

5.3.6.1 Information exchanged on e5 ................................................................................................................ 22

5.4 Interface with the Resource and Admission Control Subsystem (RACS) ........................................................ 23

5.4.1 Interface between CLF and RACF (e4) ...................................................................................................... 23

5.4.1.1 Access Profile Push ............................................................................................................................... 23

5.4.1.2 Access Profile Pull ................................................................................................................................ 25

5.4.1.3 IP Connectivity Release Indication ....................................................................................................... 25

5.5 Interfaces between NASS and the application plane and service control subsystems ...................................... 25

5.5.1 Interface between CLF and Application Functions (e2) ............................................................................. 25

5.5.1.1 Information Query Request ................................................................................................................... 26

5.5.1.2 Information Query Response ................................................................................................................ 26

5.5.1.3 Event Registration Request ................................................................................................................... 27

5.5.1.4 Event Registration Response ................................................................................................................. 27

5.5.1.5 Notification Event Request ................................................................................................................... 27

5.5.1.6 Notification Event Response ................................................................................................................. 28

5.6 Reference points between NASS and User Equipment .................................................................................... 28

5.6.1 Authentication and IP address allocation (e1) ............................................................................................ 28

5.6.2 Interface between CNGCF and CNG (e3) .................................................................................................. 28

5.6.3 Reference points with the AMF .................................................................................................................. 29

6 Mapping onto network roles................................................................................................................... 29

7 Information flows ................................................................................................................................... 32

7.1 High level information flows............................................................................................................................ 32

7.2 PPP related procedures ..................................................................................................................................... 33

7.4 IEEE 802 Ethernet access ................................................................................................................................. 39

7.5 PANA-based related ......................................................................................................................................... 40

Annex A (informative): Physical Configurations ................................................................................ 43

A.1 PPP case ................................................................................................................................................. 43

A.2 PPP with DHCP configuration ............................................................................................................... 44

A.3 DHCP (option 1) .................................................................................................................................... 45

A.4 DHCP (option 2) .................................................................................................................................... 46

A.5 PANA-based configuration .................................................................................................................... 46

Annex B (informative): Recovery procedures for functional elements within NASS ...................... 48

B.1 Conceptual information exchange flow for CLF state recovery ............................................................ 48

Annex C (informative): Bibliography ................................................................................................... 49

Annex D (informative): Change history ............................................................................................... 50

History .............................................................................................................................................................. 51

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This ETSI Standard (ES) has been produced by ETSI Technical Committee Telecommunications and Internet

The present document describes the architecture of the Network Attachment Subsystem (NASS) identified in the overall

The present document describes the architecture of the Network Attachment Subsystem (NASS) and its role in the

References are either specific (identified by date of publication and/or edition number or version number) or

• Non-specific reference may be made only to a complete document or a part thereof and only in the following

- if it is accepted that it will be possible to use all future changes of the referenced document for the

Referenced documents which are not found to be publicly available in the expected location might be found at

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The following referenced documents are indispensable for the application of the present document. For dated

references, only the edition cited applies. For non-specific references, the latest edition of the referenced document

[1] ETSI TS 133 203: "Digital cellular telecommunications system (Phase 2+); Universal Mobile

Telecommunications System (UMTS); 3G security; Access security for IP-based services

[2] ETSI ES 282 001: "Telecommunications and Internet converged Services and Protocols for

[4] ISO/IEC 7498-2: "Information Processing Systems - Open Systems Interconnection - Basic

[5] IEEE 802.1X: "IEEE Standard for Local and metropolitan area networks - Port Based Network

[6] ETSI TS 182 008: "Telecommunications and Internet converged Services and Protocols for

Advanced Networking (TISPAN); Presence Service; Architecture and functional description

The following referenced documents are not essential to the use of the present document but they assist the user with

regard to a particular subject area. For non-specific references, the latest version of the referenced document (including

[i.1] ETSI TR 121 905: "Digital cellular telecommunications system (Phase 2+); Universal Mobile

Telecommunications System (UMTS); Vocabulary for 3GPP Specifications (3GPP TR 21.905

[i.2] ETSI ES 282 007: "Telecommunications and Internet converged Services and Protocols for

Advanced Networking (TISPAN); IP Multimedia Subsystem (IMS); Functional architecture".

For the purposes of the present document, the following terms and definitions apply:

authentication: property by which the correct identity of an entity or party is established with a required assurance

NOTE: The party being authenticated could be a user, subscriber, home environment or serving network

authorization: granting of permission based on authenticated identification (see ISO/IEC 7498-2 [4])

NOTE: In some contexts, authorization may be granted without requiring authentication or identification

Customer Network Gateway (CNG): gateway between the Customer Premises Network (CPN) and the Access

NOTE: A Customer Network Gateway may be in its simplest form a bridged or routed modem, and in a more

explicit authentication: authentication that requires that the party to be authenticated performs an authentication

NOTE: For example, in IMS security (TS 133 203 [1]), explicit authentication is provided with full AKA directed

towards the IMS client entity (represented by IMPI/IMPU and USIM/ISIM) and also implicit

implicit authentication: authentication based on a trusted relationship already established between two parties, or based

on one or more outputs of an authentication procedure already established between two parties

line identification: process that establishes the identity of the line based on the trusted configuration

NASS user: entity requesting authorization, authentication and allocation of the IP-Address from the NASS

User Equipment (UE): one or more devices allowing a user to access services delivered by TISPAN NGN networks

NOTE: This includes devices under user control commonly referred to as CPE, IAD, ATA, RGW, TE, etc., but

• Dynamic provision of IP address and other user equipment configuration parameters (e.g. using DHCP).

The location of this subsystem in the overall TISPAN architecture can be found in ES 282 001 [2] and is shown here for

The Network Attachment Subsystem (NASS) provides registration at access level and initialization of

User Equipment (UE) for accessing to the TISPAN NGN services. The NASS provides network level identification and

authentication, manages the IP address space of the Access Network and authenticates access sessions. The NASS also

announces the contact point of the TISPAN NGN Service/Applications Subsystems to the UE.

Network attachment through NASS is based on implicit or explicit user identity and authentication credentials stored in

Mobility management functions provided by the NASS in the current TISPAN NGN release are limited to the ability of

a terminal to be moved to different access points and access networks (which may be owned by a different access

network provider) and a user to utilize different terminal, access points and access networks to retrieve their TISPAN

NGN services (even from another network operator). The current TISPAN NGN release does not require the support of

handover and session continuity between access networks without excluding autonomous mobility capabilities provided

NASS registration involves the identification, authentication, and authorization procedures between the UE and the

NASS to control the access to the NASS. Two authentication types are defined for NASS: Implicit authentication, for

example based on line identification, and explicit authentication, for example based on EAP. The relationship between

the identity and the credentials used for authentication must be known to the NASS for any authentication solution to be

Explicit authentication is required between the UE and the NASS. It requires a signalling procedure to be performed

between the UE and the NASS. Implicit authentication may be performed by the NASS based on the line identification

of the connection to the UE. It is a matter of operator policy which form of authentication is applied.

Both implicit authentication and explicit authentication may be used independently as NASS authentication

Depending on the access network configuration, especially for wired broadband access networks, the implicit access

authentication may rely only on an implicit authentication through physical or logic identity on the layer 2 (L2)

transport layer. A UE can directly gain access to access network without an explicit authentication procedure.

A CNG shall be able to directly access an access network without an explicit authentication procedure.

Line authentication is a form of implicit authentication. Line authentication ensures that an access line is authenticated

and can be accessed from the CNG. Line authentication shall be based on the activation of the L2 connection between

Line authentication ensures that an access line is authenticated and can be accessed from the CNG. The line ID shall be

used for line authentication. The operator's policy shall decide whether line authentication applies.

In case the CNG is a routing modem and the Customer Premises Network (CPN) is a private IP realm, authentication

shall be initiated from the CNG. In case the CNG is a bridge, each UE shall authenticate with the NASS as the IP realm

The relationship between the identity and the credentials used for authentication must be known to the NASS for any

explicit authentication solution to be possible. The identity used for explicit authentication may depend on the

authentication mechanism applied and on the access network which the UE is connected to. Two examples of these

The type of explicit authentication mechanisms used shall depend on the access network configuration and on the

This procedure is needed for the initialization of the CNGs accessing to the TISPAN NGN service subsystems.

As part of the network registration process, the NASS shall have the possibility to announce the contact information of

the TISPAN NGN Service/Applications Subsystems to the UE. In case the TISPAN NGN Subsystem is the IMS, the