Ims Inter-working aspects in Support of Cable Regulatory requirements (PktCbl-Intw) uid_350011

Resources: S2, C1,C3

References

Document	Title/Contents
WID(s)
SP-070107	S2 WID on IMS Inter-working Aspects in Support of Cable Regulatory requirements
CP-070575	C1 WID on IMS Inter-working Protocol Aspects in Support of Cable Regulatory requirements
Impacted Specifications
TS 23.228	IP Multimedia Subsystem (IMS); Stage 2 [S2 - Protocol enhancements addressing regional and performance requirements of cable deployments]
TS 24.229	Internet Protocol (IP) multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3 - C1,C3
New Dedicated Specifications/Reports
-	-

Supporting Individual Members: CableLabs, Nortel, Cisco, Samsung, Alcatel-Lucent, Siemens, Motorola, Hewlett-Packard, Ericsson.

UID	Name	Resource	Hyperlink	TS_TR
350011	IMS Inter-working aspects in Support of Cable Regulatory requirements	S2,C1,C3	SP-070107	-
350012	Architecture PktCbl-Interwork	S2	SP-070107	23.228
350013	CT1,CT3 PktCbl-Interwork	C1,C3	CP-070575	24.229

This work addresses IMS inter-working aspects driven by the regulatory requirements of cable networks, including:

• Local Number Portability (LNP) for the IMS

• Equal Access Circuit Carrier

• SIP to ISUP interworking of Local Number Portability and Equal Access Circuit Carrier parameters

Local Number Portability for the IMS is limited to telephony services, and therefore only applies to TEL URIs and SIP URIs with the parameter user=phone. Other forms of SIP URIs are not subject to LNP.

Equal Access Circuit Carrier Routing is for the purpose of preferred Circuit Switched transit carrier selection.

SA2 TS 23.228, CT3 TS 29.163 were impacted by this work, however CT1 TS 24.229 was not effected vs. WID (no record in CR Database).

Ims Enhancements for Security Requirements in Support of Cable Deployments (PktCbl-Sec) uid_340008

Resources: S3,C1,C4

References

Document	Title/Contents
WID(s)
SP-060933	S3 WID on IMS Enhancements for Security Requirements in Support of Cable Deployments
CP-070124	C3 WID on IMS Protocol Aspects for Security Requirements in Support of Cable Deployments
Impacted Specifications
TS 23.008	Organization of subscriber data [C4 - Changes to address security enhancements of cable clients]
TS 24.229	Internet Protocol (IP) multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3 [C1 - provisioning, configuration and management of clients in cable networks]
TS 29.228	IP Multimedia (IM) Subsystem Cx and Dx Interfaces; Signalling flows and message contents [C4 - Changes to address security enhancements of clients in cable networks]
TS 29.229	Cx and Dx interfaces based on the Diameter protocol; Protocol details [C4 - Changes to address security enhancements of clients in cable networks]
TS 33.203	3G security; Access security for IP-based services
TS 33.210	3G security; Network Domain Security (NDS); IP network layer security [security requirements for cable deployment models]
TS 33.220	Generic Authentication Architecture (GAA); Generic bootstrapping architecture [security requirements for cable deployment models]
New Dedicated Specifications/Reports
-	-

Supporting Individual Members: CableLabs, Cisco, Lucent, Motorola, Nortel, Samsung, Siemens.

UID	Name	Resource	Hyperlink	TS_TR
340008	IMS Enhancements for Security Requirements in Support of Cable Deployments	-	SP-060933	-
350033	SA3 Aspects of PktCbl-Sec	S3	SP-060933	33.203, 33.210, 33.220
350006	CT1 Aspects of PktCbl-Sec	C1	CP-070124	24.229
380029	CT3 Aspects of PktCbl-Sec	C3	CP-070124	29.163
350007	CT4 Aspects of PktCbl-Sec	C4	CP-070124	29.228, 29.229, 23.008

Cable networks support deployment models and client types, currently not completely supported or enabled in 3GPP Rel-7 IMS. This work enhances IMS to address security aspects of clients in cable network deployments e.g.:

• Subscriber first selects and installs a UE independent of the Service Provider and without pre-provisioning of Service Provider information or credentials;

• Service Provider is then able to provide emergency, informative or trial services without requiring pre-configuration of information;

• UE downloads necessary configuration data at boot-time;

For supporting the needed range of cable client types, the IMS was enhanced to support multiple types of client credentials. This required a framework capable of supporting, at a minimum, the following types of credentials used in cable environment:

• ISIM or USIM within UICC;

• Username and Pre-shared key;

• Certificates;

Cable requirements being driven by cable deployments, no additional requirements on mobile networks or non-cable network operators were posed. Enhancements were pursued so that any other broadband access networks with similar requirements (e.g. TISPAN NASS) may choose to support the enhancements required for cable networks. These enhancements are only for non-3GPP access networks and not intended for 3GPP access networks.

In SA3 TS 33.203 a normative annex on Access security with TLS has been added to address Security Requirements for cable deployments.

In an environment where multiple types of security are supported, the solution must enable a mechanism for automatic discovery of the security mechanism to be used, and to ensure compatible interworking between client and network. Note: there is no intention to overcome the requirements that for IMS access over UTRAN and GERAN based 3GPP systems UICC-based mechanisms are the only supported mechanisms.

In order to support the needed cable deployment models, the cable enhancements to IMS shall support a framework for the following signalling security requirements to be negotiated between the UE and P-CSCF:

• Signalling with clients behind NAT and Firewall devices

• Client types that cannot rely on the underlying platform

• Performance efficiency for wide variety of clients

• Ability for the network to make use of lower layer access security and relax the creation of security associations between the UE and the P-CSCF based on operator discretion (for example. when the underlying access is granted via the Data Over Cable Service Interface Specification (DOCSIS), IP-CAN)

CT1, CT4 affected specifications: TS 24.229, TS 23.008, TS 29.228 and TS 29.229.