sip-based mobility in a future ngn-based core … a future ngn-based core network for...
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SIP-based Mobilityin a future NGN-based Core Network
for TETRA-PMR-Systems Selected results of an R&D project funded by the Federal Ministry of Economics and Technology (BMWi), Germany
Rohde & Schwarz Professional Mobile Radio GmbHResearch Group IP-based Communications Systems, Ostfalia University of Applied Sciences
Daniel Hartmann, Xing Cao, Mark Stephan, Diederich Wermser
3rd NGN Workshop, TNO, DelftNovember 02, 2011 - November 03, 2011
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Research Group IP-based Communication SystemsVoice over IP, Multimedia over IPSession Initiation Protocol (SIP)Presence Service
NGN: IMS (IP Multimedia Subsystem), TISPANSoft-PBX: SipXecs, eZuce, Asterisk, FreeSWITCH
Quality-of-Service-Mechanisms (QoS)IntServ, DiffServ, MPLS, IPv6Routing, NAT„VoIP-Readiness“ AnalysisSecurity in VoIP-Systems
Testing of IP-based Communication SystemsConformity Tests, TTCN-3Interoperability TestsStress Tests
Development and Integration of Open Source SoftwareSelf developed Open Source Soft PBX Askozia®Adaption of Open-Source-Components for Embedded-Hardware-Solutions
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Overview
1. Initial Situation - Today‘s TETRA
2. Approach for an NGN-based Core Network
3. Proof-of-Concept Implementation with SIPfoundry‘s sipXecs
4. Example for a TETRA-specific Feature: Push-to-Talk Group Call
5. Selected Aspects of Mobility Support
6. Conclusion
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TETRA Professional Mobile Radio System
Terrestrial Trunked Radio
Initial Situation
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Today‘s TETRA Architecture (simplified)
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BS: Base StationTDM: Time Division MultiplexLR: Location RegisterPSTN: Public Switched Telephone NetworkT-MS: TETRA Mobile Station
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Approach for an NGN-based Core Network using VoIP
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Aspects of using other radio access networks (e.g. LTE)
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● Extend the coverage or provide redundancy
● Much higher bitrate on the air interface
● Challenge: Seamless handovers between both access networks
Quelle: Dahlman, Erik et al.: 3G Evolution.
„new“ TETRAcore network
??
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Proof-of-Concept Implementation
Open Source SIP Service Orientated Architecture (SSOA)
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IMS Architecture (simplified)
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AS: Application ServerHSS: Home Subscriber ServerCSCF: Call Session Control FunctionMRF: Media Resource FunctionSG/MGCF: Signalling/Media Gateway Control FunctionMGW: Media Gateway
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sipXecs as a Set of Building Blocks for the Core Network
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Source: Schumacher, Jan; Wermser, Diederich: VoIP-TK-Anlagen auf Basis von Open Source.
HSS CSCF
MRFMGW
AS
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TETRA Group Call
An essential TETRA-Feature – Implemented as an Application Server
Push-to-Talk over Cellular (PoC)
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Examples to implement Floor Control:
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● Talk Burst Control Protocol (TBCP): In-band signalling
● Alternative: Floor Control with SIP-Mechanisms
Source: Lescuyer, Pierre; Lucidarme, Thierry: Evolved packet Systems (EPS).
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Group Call Server Concept
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Application Server
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Mobility Support
Selected Aspects
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Examples for Handover Scenarios
● handover w/o (1) or w/ (2) changing the Cluster Controller.
● „concurrent“ handover of severalmobile devices (3)
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IP-Layer Mobility in UMTS Release 5
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Source: Trick, Ulrich; Weber, Frank: SIP, TCP/IP und Telekommunikationsnetze.
TETRA-MS has noIP-stack, so mobilityhas to implementedon a different layer.
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SIP-Layer Mobility for TETRA Core Networt (Concept)
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Before HandoverAfter Handover
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Terminal Mobility in Idle Mode (Concept)
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Session Mobility (Concept)
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INVITE Replace (RFC 3891)
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Outlook:Analysis of Interaction between Group Calls and Mobility Support
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Before HandoverAfter Handover
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Conclusion
… and outlook.
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Conclusion and Outlook
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● Extend base stations with a gateway between the TETRA air-interface andthe new NGN-core.
● Mobility for TETRA mobiles can be provided by application layer mobilityusing SIP-based methods (SIP Presence, INVITE Replace).
● TETRA-specific features and services can be implemented by additional application servers ( IMS).
● Detailed Tests:– Performance, scalability, stress tests, high availability and redundancy.
● Integration of LTE into TETRA has to be investigated:– SRVCC (Single Radio Voice Call Continuity) „seamless“ Handover
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Thank You!
Any Questions?
Contact:Daniel Hartmann Prof. Diederich [email protected] [email protected]
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