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

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1 Satellites in Next Generation s QoS issues Stéphane 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 Satellite NGN : QoS issues 2

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

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

5 NGN General Layered QoS Model Application Layer end user URI End Session Layer URI Connection Control Layer End End Transport Layer Hop Hop Hop Hop routing routing routing routing URI End end user P-CSCF PCF COPS Session Layer Connection Layer ARC AC End User Access AG COPS Transport Layer Core Satellite NGN : QoS issues 5

6 Current Satellite Systems Access Architectures > DVB-RCS architecture 2-way multimedia IP based DVB-S forward link MF-TDMA return link ATM or MPEG segmentation Packet based DAMA LAN LAN LAN LAN RMG SOHO/RES Multi- Dwelling SME/Enterprise ISP POP Return link Telco POP Satellite Terminal () Return link MF-TDMA ATM or MPEG Forward link TDM DVB-S HUB Access Node RAS Management Centre Telcos Transport network PN ISPs Corporate > Regenerative Satellite architecture Multi-Gateway Mesh: direct -to- ATM or MPEG on-board switching DVB-S downlink DVB-RCS uplink LAN ISP Corporate Interactive j ISP Corporate Satellite On Board Processor (cell or circuit switching ) Traffic link Interactive i Signalling link Signalling link NCC i Access Control functions for Interactive i MNMS Access Management Satellite NGN : QoS issues 6

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 s Service providers grant subscribers a per traffic contract: Best effort with peak rate Minimum guaranteed rate with a peak rate > Static Admission Control At 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 Satellite NGN : QoS issues 7

8 Enhancing the current situation Expected improvements > EP 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 Traffic contract modification of the from NMC or upon user s request (e.g. using a Web-based interface) > EP 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 (, H323) Satellite NGN : QoS issues 8

9 Enhancing the current situation Star Architecture SERVICE PROVIDER Application PDP AAA CDRs on ### Session protocol Call Server +Transport PDP transport Policy control protocol Call Endpoint AG RSVP Call Signalling Media flow QoS Signalling HUB Forwarding AG QoS Signalling RSVP Call Endpoint transport QoS protocol Connection Signalling Connection Signalling NCC Transport PEP proxy DAMA AG COPS QoS Signalling Satellite transport QoS protocol (DVB-RCS extension) TRANSPORT PROVIDER CDRs on Satellite NGN : QoS issues 9

10 Enhancing the current situation Mesh architecture SERVICE PROVIDER Application PDP AAA CDRs on ### Call Server + Transport PDP Call Endpoint RSVP AG Media flow Call Signalling QoS Signalling RSVP HUB Forwarding COPS QoS Signalling NCC Transport PEP Call Endpoint RSVP AG Connection Signalling DAMA proxy LPDP AG TRANSPORT PROVIDER CDRs on IP@ Satellite NGN : QoS issues 10

11 Satellite in NGN Status > 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 Satellite NGN : QoS issues 11

12 Satellite in NGN Future 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 Satellite NGN : QoS issues 12

SATIP6 project > Funded by EC (I program) > Started march 2002, ends april 2004 > Partners : Alcatel Space (leader), France Telecom R&D (F), Telecom Italia- Lab (I), SINTEF (N), University of

13 SATIP6 project > Funded by EC (I program) > Started march 2002, ends april 2004 > Partners : Alcatel Space (leader), France Telecom R&D (F), Telecom Italia- Lab (I), SINTEF (N), University of Roma-Sapienza (I), AQL (F), LAAS-CNRS (F) > Technical objectives for the short-to-medium term focusing on adaptation of DVB-RCS access for IP services with traditional transparent satellite MPLS based VPN service PPPoE based Internet access for long term in which IPv6 and NGN will be introduced over next generation satellites (regenerative OBP payloads) IPv4/v6 migration NGN QoS multicast optimised security (SatIPSec) IP-Dedicated connectionless access over DVB-RCS Satellite NGN : QoS issues 13

Satellite and next generation networks : QoS issues

Satellite and next generation networks : QoS issues Stephane Combes, Olivier Alphand, Pascal Berthou, Thierry Gayraud To cite this version: Stephane Combes, Olivier Alphand, Pascal Berthou, Thierry Gayraud.