Colombo, Sri Lanka, 7-10 April 2009 Preferential Telecommunications Service Access Networks Lakshmi Raman, Senior Staff Engineer Intellectual Ventures USA FORUM ON NEXT GENERATION STANDARDIZATION (Colombo, Sri Lanka, 7-10 April 2009)

2 Overview Preferential Telecommunications Service* NGN considerations for PTS Capabilities and Mechanisms to support PTS Requirements for PTS in NGN Access Networks Signaling and Control support in Cable Access ITU Recommendations in support of PTS * Emergency Telecommunications and Preferential Telecommunications are used to represent the concept in different ITU Recommendations.

3 PTS Overview Preferential Telecommunications Service Characteristics Categories Considerations with NGN versus Circuit-Switched Network Environments

4 PTS Characteristics Assured capabilities to enable operations in the event of impacts to Telecommunications infrastructures Examples of PTS Telecommunications for disaster relief National/Regional/Local Emergency/Public Safety Early Warning Systems to individuals exposed to hazards to avoid or reduce risks Categories* Individual to authority Authority to individual Authority to authority Individual to individual * ETS ITU Recommendation focuses on authority to authority

5 NGN versus Circuit Switched Environment Provisioning of PTS capabilities is not entirely straightforward, obvious or simple. A simple transposition from the circuit-switched world is not appropriate.

6 Capabilities and Requirements Enhanced priority treatment Secure networks Location Confidentiality Service Restoration Priority Network connectivity Interoperability Mobility Ubiquitous coverage Survivability/endurability Real-time transmission to support: voice/real-time text and video/imagery(where bandwidth is available) Non-real-time transmission to support: messages / non-real-time streams (audio/video) Scaleable bandwidth Reliability/availability

7 Mechanisms Identification and marking of the PTS traffic Example mechanisms in Service Stratum: SIP Resource Priority header,call priority designator in ITU-T H460.4.priority indicator in H Admission control policy Allowing requests from PTS traffic over regular traffic Bandwidth allocation policy Example in Transport Stratum: Resource Reservation Protocol, DSCP code points Authentication and authorization of bona-fide PTS users Use of PINs, user and subscription profiles

8 Access Networks Requirements Different Access Technologies Cable,xDSL, Wireless,optical Signaling and Control Requirements Recognize PTS traffic Provide preferential/priority access to resources/facilities May require mapping of security levels when different values are used in different domains Support preferential/priority routing of PTS traffic Preferential/priority establishment PTS sessions/calls

9 Access Networks Requirements (2) Security Considerations Protecting all aspects of PTS, signaling and control, bearer/media, and management related data and information Establishment and enforcement of security policies and practices that are specific to PTS Authentication users with priority to prevent denial of service attacks by non authorized users A minimum of two mechanisms recommended for IPCablecom networks Implementation of mitigation capabilities to provide protection against various security threats Protecting end-to-end communications when traversing multiple provider domains

10 Priority Mechanisms for IPCablecom2 Networks Priority Labeling RTP does not provide support for labeling packets Priority Signaling SIP Resource Priority header in the user agent Two options are possible SIP UA include the R-P Header Proxy Call Serving Control Function (P-CSCF) translates a code value to appropriate R-P Header value Priority Enabling Mechanisms Data link layer support for DOCSIS Service Flows according to traffic priority set for PTS sessions Session layer status set up propagating the priority status to all relevant entities in the network

11 Example Call Flow in IPCablecom 2 networks

12 PTS/ETS NGN ITU- Recommendations ITU-T Y.1271, Framework(s) on Network requirements and capabilities to support emergency telecommunications over evolving circuit and packet switched networks ITU-T Y.2205, Next Generation Networks, Emergency Telecommunications- Technical Considerations ITU-T H.460.4, Call priority designation and country/international network of call origination identification for H.323 Priority calls ITU-T H.248.1, Gateway control protocol: Version 3. ITU-T Y.2111, Resource and admission control functions in Next Generation Networks. ITU-T J.260, Requirements for Preferential Telecommunications over IPCablecom networks ITU-T J.261, Framework for implementing preferential telecommunications in IPCablecom networks ITU-T J.262, Specifications for Authentication in Preferential Telecommunications over IPCablecom2 networks ITU-T J.263, Specifications for Priority in Preferential Telecommunications over IPCablecom2 networks