1 / 12

Satellites in Next Generation Networks QoS issues Stéphane Combes, R&D, Alcatel Space

Satellites in Next Generation Networks QoS issues Stéphane Combes, R&D, Alcatel Space. ITU-T workshop on Satellites in IP and Multimedia Geneva, 9-11 December 2002. Content. What NGN and QoS mean ? End-to-end QoS Layered model Current Satellite Systems Access network architectures QoS

louis-cruz
Download Presentation

Satellites in Next Generation Networks QoS issues Stéphane Combes, R&D, Alcatel Space

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Satellites in Next Generation NetworksQoS issuesStéphane Combes, R&D, Alcatel Space ITU-T workshop on Satellites in IP and Multimedia Geneva, 9-11 December 2002

  2. Content • What NGN and QoS mean ? • End-to-end QoS • Layered model • Current Satellite Systems • Access network architectures • QoS • Enhancing the current situation • Expected improvement • Architectures • Satellite in NGN • Status • Future Activities

  3. NGN In Short • NGN (Next Generation Networks) means • Uncoupling services and transport provision (like IN) • Multimedia/multi-services/multi-networks • Packet-based (IP) • QoS and security are MUST ! • QoS for NGN means • QoS aware network equipment • Admission control mechanisms • Interaction between call signalling, resources management and admission control

  4. 2 1 5 5 3 4 Home Network Home Network P-CSCF P-CSCF Applic. S-CSCF S-CSCF Applic. QoS Selection QoS Selection SIP SIP SIP SIP QoS Negotiation SIP SIP End User SIP End User Access Network Access Network Bearer setup Bearer setup Visited Network Core Network Visited Network Originating side Terminating side NGN End-to-End QoS

  5. Application Layer QoS info QoS info Session Layer URI URI URI P-CSCF QoS info QoS info QoS info QoS info QoS info Connection Control Layer end end Session Layer user End IP @ End IP @ user SIP QoS info QoS info QoS info QoS info End AC ARC PCF End IP @ Transport Layer IP @ COPS Connection Layer Hop Hop Hop Hop routing routing routing routing AG Transport Layer COPS End User Access Network Core Network NGN General Layered QoS Model

  6. Current Satellite SystemsAccess Network Architectures • DVB-RCS architecture • 2-way multimedia • IP based • DVB-S forward link • MF-TDMA return link • ATM or MPEG segmentation • Packet based DAMA • Regenerative Satellite architecture • Multi-Gateway • Mesh: direct ST-to-ST • ATM or MPEG on-board switching • DVB-S downlink • DVB-RCS uplink

  7. Current Satellite Systems QoS • Service Level Agreement (SLA) • Satellite network operator grants a given bandwidth (usually constant) to each service provider for its pool of STs • Service providers grant subscribers a per ST traffic contract: • Best effort with peak rate • Minimum guaranteed rate with a peak rate • Static Admission Control • At ST log-on • Upon management action • Traffic Contract Enforcement • Return link: DAMA algorithms using capacity categories defined in DVB-RCS: CRA, RBDC, VBDC, FCA • Forward link: IP and/or ATM traffic management (policy, shaping) in the Hub

  8. Enhancing the current situationExpected improvements • STEP 1 - Adding flexibility & better QoS in the access • Priority mechanisms between Real-Time and non Real-Time applications according to IP CoS indications (DiffServ DSCP) • Coupling between IP and MAC processes in ST • Traffic contract modification of the ST from NMC or upon user’s request (e.g. using a Web-based interface) • STEP 2 - Interworking between access and core NGN enabled networks • Dynamic admission control based on specific satellite signalling mechanisms • Dynamic admission control and resource reservation coupled with call signalling protocols (SIP, H323)

  9. Enhancing the current situation Star Architecture Session protocol Network transport Policy control protocol Network transport QoS protocol Satellite transport QoS protocol (DVB-RCS extension)

  10. Enhancing the current situation Mesh architecture

  11. Satellite in NGNStatus • Current NGN-related terrestrial network activity is huge • Standards : IETF, ITU, ETSI • Planned roll-out for Cable, UMTS and DSL access networks • Satellite system is weak in NGN picture • Only pure physical/access layer standards (DVB-RCS) • No QoS support definition • No satellite/terrestrial interworking defined • Current proprietary solutions and weak QoS • May slow down the up-taking of NGN and their associated services through satellite

  12. Satellite in NGNFuture Activities • Determine typical applications/services scenarios requiring QoS support and their requirements for integration of Broadband Multimedia systems • Define QoS architectures, identify functional entities and interfaces. Analyse call signalling/resources management/ admission control interactions • Guarantee interoperability with terrestrial NGN protocols or propose extensions/profiles. Analyse specific processing or adaptations required in satellite access equipment at adaptation & access layers • Propose potential extensions or adaptations to satellite access standards such as DVB-RCS : transparent +OBP based meshed systems

More Related