Emergency Services and Priority Signaling

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Eunice Jenkins
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1 ITU-T / ATIS Workshop Next Generation Technology and Standardization Emergency Services and Priority Signaling Martin Dolly AT&T (With credit to Percy Tarapore (AT&T) for Priority contributions) ITU-T

2 What are Emergency Services? o Government Emergency Services Emergency Telecommunications Service (ETS) ETS extends the functional requirements, capabilities and applications of Governments Emergency Telecommunications Service/Wireless Priority Service (Gets/WPS), including multimedia services for National Security and Emergency Preparedness (NS/EP) communications over multiple network environments, including endto-end IP-based packet networks. Telecommunications for Disaster Relief (TDR) TDR is an application of (or the use of) an international telecommunications capability on a per occasion basis for purposes of disaster relief and mitigation. Network and service facilities used to support TDR may or may not be dedicated to the TDR application alone. o Civil Emergency Services (e.g., E911 in USA) ITU-T 2

3 Emergency Telecommunications Service (ETS) o Requires priority treatment in the IP network infrastructure to support of National Security / Emergency Preparedness (NS/EP) communications. o Has capabilities to increase the probability of successful completion of calls, sessions, or other communications, initiated by government authorized users over the public network infrastructure. o Also includes legacy circuit-switched NS/EP services such as Government Emergency Telecommunications Service (GETS) and Wireless Priority Service (WPS). (TIA uses the term Wireless Priority Service whereas 3GPP uses the term Priority Service ) ITU-T 3

4 IP-ETS Phase 1 - ATIS Standards o IP-ETS Phase 1 ETS within and between IP based service provider networks. Currently in the approval process. Architectural Agnostic Phase 1 addresses: Procedures for interoperability/interworking between IP-based and existing circuit-switched wireline and wireless service provider networks; Basic ( GETS-like ) authentication mechanisms and procedures; Security requirements. o Packet Priority Marking Release 1: In Letter Ballot Process ITU-T 4

5 IP-ETS Phase 2 - ATIS Standards o IP-ETS Phase 2: Issue statement (project statement of work) was approved, and will create a Standard that defines protocol and procedures for supporting ETS in NGN/IMS, with a focus on security and authentication on IP access. Work Directed to ITU SG 11 for signaling. Authentication and Security: Work Directed to Recommendations in ITU-T SG13 To be Aligned with a Standards in ATIS ITU-T 5

6 IP-to-IP Network Interconnection, IP Access Network Originating Access A ETS-DN RPH=ets.DF Technology Boundary Core 1 Core 2 A CPC=NS/EP RPH=ets.DFx RPH=ets.x Terminating Access B ETS-DN RPH=ets.DF RPH=ets.DFx A RPH=ets.x CPC=NS/EP Um Default priority value Used on Um interface C ETS-DN A RPH=ets.DFx RPH=ets.x RPH=ets.DF RPH=ets.x RPH=ets.x D WPS-FC+DN A RPH=ets.y, wps.y Um RPH=ets.y, wps.y RPH=ets.y, wps.y RPH=ets.y, wps.y ITU-T 6

7 Network Element Capability needs o Setting SIP RPH (P-CSCF/A-BGF, MGCF/MGW) o Passing and Acting on SIP RPH (all elements) o SIP-SS7 Interworking, TDM HPC, Trunk Queuing, TDM HPC Measurements (MGCF/MGW/SGW) o H.248 Priority for NS/EP if Applicable o Processing Priority (all elements) o Priority Access at Resource Admission (Applicable PDP & PEP elements) o Exemption from NM and Congestion Controls (all Applicable Elements) o Vertical Interface (setting DCSP) Support to Trigger Layer 3 Priority (layer 2 also if needed, all elements) o RPH, NMx measurements (all applicable elements) o Access to the NS/EP AS, MS (for authentication) with applicable interfaces ITU-T 7

8 ATIS Functional Architecture and Interfaces Rr/Ro UE IMS Core functions SIP H.248 DIAMETER Other Gm MRB If Mw P-CSCF Access SBC SCIM Mw ISC S-CSCF Mr AS Cx Dh Mw Mi Mg MRFC MS Mp Sh SLF Dx HSS Cx I-CSCF Mi BGCF Mj MGCF Rf/Ro PSTN GW Charging Function Mw/Mk/Mm SGF SGW PSTN/ISDN PSTN Ib IWF IBCF SEG Ia Ic Inter- Id connect SBC Other IP Networks A-BGF MRFP T-MGF MGW I-BGF ITU-T 8

9 ETS Call Flow SBC UE P-CSCF S/I-CSCF AS INVITE ( R-URI, RPH[ets.??) INVITE ( R-URI, RPH[ets.DF]) MS Toward Dest. NOTE: Ack s are not shown 200OK [INVITE] (RPH[ets.DF]) 200OK [INVITE] (RPH[ets.DF]) INVITE (VXML R-URI, RPH[ets.DF]) INVITE (VXML R-URI, RPH[ets.DF]) 200OK [INVITE] (RPH[ets.DF]) 200OK [INVITE] (RPH[ets.DF]) AS Authenticates the User PIN and Destination Number BYE (RPH[ets.x]) 200OK [INVITE] (RPH[ets.DF]) http (VXML) 200OK (RPH[ets.x]) reinvite (Null-SDP, RRH[ets.x]) reinvite (Null-SDP, RRH[ets.x]) reinvite (Null-SDP, RRH[ets.x]) INVITE ( R-URI=Destination#, RPH[ets.x]) reinvite (SDP, RRH[ets.x]) RTP Media on Hold to User, and Released from the Media Server reinvite (Dest-SDP, RRH[ets.x]) RTP Media MS plays tones and announcements to the calling user to collect PIN and Dest. Number MS responds to AS with Users Input NOTE: remaining set-up messages toward destination are not shown RTP Media ITU-T 9

10 Priority Classification & Signaling ATIS Committee Efforts o o Priority Classification in IP Networks: 3 CAC/Resource Reservation Levels: High Priority Reserved for Emergency Traffic (e.g., ETS & E911) Technical Report to be Published Up to 3 Restoration Levels Emergency Traffic to be included in High Priority Traffic Technical Report to be Published Priority Signaling Issues: Technical Requirement in Progress for Separate EF PHB for VoIP ETS Requirements Document for Vertical Signaling Interface: Traffic Priority & QoS Signaling from Application to User/Media Planes Minimum attributes Necessary for Layer 3 Processes (e.g., DiffServ, DS-TE) Comprehensive List of Priority and QoS Parameters ITU-T 10

11 Thank You ITU-T 11

Signaling Architecture

ITU-T / ATIS Wrkshp Next Generatin Technlgy and Standardizatin Signaling Architecture Viqar Shaikh Telcrdia ITU-T Scpe Call Cntrl Signaling Architecture Identify Netwrk Elements invlved in call cntrl signaling