ETSI TR 182 026 V3.1.1 (2009-09)

Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); Impact of mobility for access-technology independent networks in the TISPAN NGN architecture

DTR/TISPAN-02069-NGN-R3

General Information

• Status: Published
• Publication Date: 28-Sep-2009
• Technical Committee: TISPAN 2 - TISPAN Architecture
• Current Stage: 12 - Completion
• Due Date: 01-Oct-2009
• Completion Date: 29-Sep-2009

Standards Content (Sample)

ETSI TR 182 026 V3.1.1 (2009-09)
Technical Report


Telecommunications and Internet converged Services and
Protocols for Advanced Networking (TISPAN);
Impact of mobility for access-technology independent
networks in the TISPAN NGN architecture

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2 ETSI TR 182 026 V3.1.1 (2009-09)



Reference
DTR/TISPAN-02069-NGN-R3
Keywords
mobility
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3 ETSI TR 182 026 V3.1.1 (2009-09)
Contents
Intellectual Property Rights . 4
Foreword . 4
1 Scope . 5
2 References . 5
2.1 Normative references . 5
2.2 Informative references . 5
3 Definitions and abbreviations . 6
3.1 Definitions . 6
3.2 Abbreviations . 6
4 Overview of Mobility in NGN . . 7
4.1 SIP-based mobility and MIP-based mobility . 7
5 Mobility Scenarios in NGN . 7
5.1 Intra-AN Mobility Scenarios . 8
5.2 Inter-AN Mobility Scenarios . 9
5.2.1 Inter-AN Mobility Scenarios between same type of access networks . 10
5.2.2 Inter-AN Mobility Scenarios between different types of access networks . 10
5.3 Inter-CN Mobility Scenarios . 11
5.3.1 Scenario G: Mobility between WiMax Core Networks owned by different NGN Operators . 11
6 Mobility control and management considerations for NGN . 11
6.1 Moving Object . 11
6.2 Moving Qualities . 12
6.3 Moving Level . 13
7 Mobility Impacts on TISPAN NGN . 13
7.1 Mobility Impacts on NGN Requirements (Stage 1) . 14
7.2 Mobility Impacts on NGN Architecture (Stage 2) . 14
7.2.1 Mobility Impacts on N ASS . 14
7.2.2 Mobility Impacts on RACS . 15
7.2.3 Mobility Impacts on other Subsystems . 16
7.3 Mobility Impacts on NGN Protocols (Stage 3) . 16
7.4 Mobility Impacts on NGN Security. 16
7.5 Mobility Impacts on NGN Management . 16
7.6 Mobility Impacts on NGN NNA . 16
7.7 Mobility Impacts on NGN CPN . 16
8 General Conclusions. 16
History . 17

ETSI

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4 ETSI TR 182 026 V3.1.1 (2009-09)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (http://webapp.etsi.org/IPR/home.asp).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Foreword
This Technical Report (TR) has been produced by ETSI Technical Committee Telecommunications and Internet
converged Services and Protocols for Advanced Networking (TISPAN).
ETSI

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5 ETSI TR 182 026 V3.1.1 (2009-09)
1 Scope
The present document identifies TISPAN NGN mobility scenarios and the impact of mobility between access-
technology independent networks.
The main impact of these scenarios is expected to be on the NASS and RACS architectures, but does not preclude other
impacts within the TISPAN NGN architecture. The present document may also recommend a way forward to support
these scenarios; however, it may also conclude that no further work in TISPAN is required.
The present document is expected to be access-technology independent and as such will require coordination of the
TISPAN work with external SDOs and Fora such as 3GPP, ITU-T, ECMA, and the WiMAX Forum.
2 References
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• Non-specific reference may be made only to a complete document or a part thereof and only in the following
cases:
- if it is accepted that it will be possible to use all future changes of the referenced document for the
purposes of the referring document;
- for informative references.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference.
NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee
their long term validity.
2.1 Normative references
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
(including any amendments) applies.
Not applicable.
2.2 Informative references
[i.1] ETSI ES 282 001: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); NGN Functional Architecture".
[i.2] ITU-T Recommendation Q.1706/Y.2801: "Mobility management requirements for NGN".
[i.3] ETSI ES 282 004: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); NGN Functional Architecture; Network Attachment
Sub-System (NASS)".
[i.4] ETSI ES 282 003: "Telecommunications and Internet converged Services and Protocols for
Advanced Networking (TISPAN); Resource and Admission Control Sub-System (RACS):
Functional Architecture".
ETSI

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6 ETSI TR 182 026 V3.1.1 (2009-09)
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
access network: collection of network entities and interfaces that provide the underlying IP transport connectivity
between end user devices and NGN entities
NOTE: See ES 282 001 [i.1].
core network: portion of the delivery system composed of networks, systems equipment and infrastructures,
connecting the service providers to the access network
NOTE: See ES 282 001 [i.1].
handover: ability to provide service with some impact on their service level agreements to a moving object during and
after movement
NOTE: This may include a session break and resume, or a certain degree of service interruption or loss of data
while changing to the new access point. See ITU-T Recommendation Q.1706/Y.2801 [i.2].
MIP-based mobility: approach for service continuity in NGN which is implemented in network layer using MIP
nomadism: ability of the user to change his network access point on moving; when changing the network access point,
the user's service session is completely stopped and then started again, i.e. there is no session continuity or handover
possible
NOTE: It is assumed that normal usage pattern is that users shutdown their service session before moving to
another access point. See ITU-T Recommendation Q.1706/Y.2801 [i.2].
service continuity: ability for a moving object to maintain ongoing service over including current states, such as user's
network environment and session for a service
NOTE: This category includes Seamless Handover and Handover. See ITU-T Recommendation Q.1706/Y.2801
[i.2].
seamless handover: special case of mobility with service continuity since it preserves the ability to provide services
without any impact on their service level agreement to a moving object during and after movement
NOTE: See ITU-T Recommendation Q.1706/Y.2801 [i.2].
SIP-based mobility: approach for service continuity in NGN which is implemented in the application layer using SIP
signalling
3.2 Abbreviations
For the purposes of the present document, the following abbreviations apply:
AN Access Network
CN Core Network
CNG Customer Network Gateway
CPN Customer Premises Network
NASS Network Attachment Sub-System
NOTE: See ES 282 004 [i.3].
AMF Access Management Function
NOTE: See ES 282 004 [i.3].
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7 ETSI TR 182 026 V3.1.1 (2009-09)
UE User Equipment
NOTE: See ES 282 004 [i.3].
RACS Resource and Admission Control sub-System
NOTE: See ES 282 003 [i.4].
4 Overview of Mobility in NGN
Mobility is an essential requirement for NGN users to communicate at anytime and from anywhere. This could be
facilitated through the use of various wire and wireless access technologies over heterogeneous network.
The solution of the mobility in NGN should take into account the long-term trend for future network, the need for a
smooth evolution of the infrastructure, and the impact on existing network.
In current NGN, the mobility for nomadism has already been supported, while the mobility for service continuity
(i.e. handover and seamless handover) is not yet supported.
4.1 SIP-based mobility and MIP-based mobility
There are two approaches for service continuity in NGN:
1) Implemented in network layer using MIP, which is called MIP-based mobility.
2) Implemented in the application layer using SIP signalling, which is called SIP-based mobility.
For SIP-based mobility, the solution requires network to support handover using SIP. It may support a make-before-
break handover scheme. It is IP version and Access technologies agnostic and the service characteristics may be
changed during the mobility procedure (e.g. add or remove media).
For MIP-based mobility, the solution bases on the well established MIP protocol family. The mobility is transparent to
the applications and access technologies. It may support the different IP version. Consequently, some kind of network
assistance during handover is needed to provide MIP-based seamless mobility. MIP-based mobility is also chosen for
inter-access mobility management in heterogeneous networks involving both 3GPP and WiMAX.
5 Mobility Scenarios in NGN
Various types of mobility scenarios exist in NGN environments. The present document considers the classifications
illustrated in figure 5.1. In figure 5.1, the mobility scenarios in NGN are classified into four categories: intra-AN
mobility scenarios, inter-AN mobility scenarios between same type of access networks, inter-AN mobility scenarios
between different types of access networks, and inter-CN mobility scenarios.
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8 ETSI TR 182 026 V3.1.1 (2009-09)
AN 6(T3)
2b
AN5 (T2)
CN2
2a
1
AN7 (T2) AN4 (T2)
2b
1
AN8 (T3)
CN3
2b AN3 (T3)
1
2b
AN9 (T1)
AN2 (T1)
CN1
2a
Inter-CN Mobility
AN1 (T1)
Inter-AN Mobility between same type of ANs
Inter-AN Mobility between different types of ANs
3
Intra-AN Mobility
AN Access Network
CN Core Network
TType of AN

Figure 5.1: Classification of Mobility Scenarios
5.1 Intra-AN Mobility Scenarios
Intra-AN mobility scenarios address mobility within an AN. In figure 5.1, for example, mobility within AN1 of CN1
can be classified as Intra-AN mobility scenarios, marked as "3" in the figure.
Scenario A: Mobility between WiMax Access Networks owned by the same NGN Operator
User Bob is at the office (i.e. corporate network) and originates a voice call with User Alice via terminal supporting the
WiMAX mode. When the call/session is established between Bob and Alice, Bob keeps the voice session ongoing and
sets off from the office to the home. There are several WiMAX access nodes between Bob's office and Bob's home. In
this way, Bob's WiMAX terminal needs to be moved from one access node (e.g. WiMAX BS) to another between the
office and the home that are owned by the same NGN Operator. In this scenario, only one service control subsystem
(e.g. IMS), one RACS and one NASS are considered in the access network.

Figure 5.2: Mobility between WiMax Access Network owned by the same NGN Operator
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9 ETSI TR 182 026 V3.1.1 (2009-09)
Scenario B: Mobility between WiFi Hotspots owned by the same NGN Operator
User Bob has a WiFi enabled terminal and originates a voice call with User Alice at anywhere. During the call, User
Bob roams between WiFi Hotspots that are owned by the same NGN Operator whilst keeping the call/session
established.

Figure 5.3: Roaming between WiFi Hotspots owned by the same NGN Operator
For this specific scenario, the CNG operates in bridge mode and directly attaches to the NASS.
Scenario C: Roaming between WiFi Hotspots owned by different NGN Operator's
This scenario is not described in the present document.
Scenario D: Mobility between a WiFi Hotspot and WiMAX owned by the same NGN Operator
User Bob has a dual mode phone which supports WiFi/WiMAX. Because WiMAX mode has poor indoor coverage and
potentially has a higher cost than using WiFi mode, Bob chooses the Wi
...