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Admission Control in IP Multicast over Heterogeneous Access Networks

Admission Control in IP Multicast over Heterogeneous Access Networks. Pedro Santos (PT Inovação ) António Pinto, Manuel Ricardo (INESC Porto) Franscisco Fontes , Teresa Almeida (PT Inovação ). Outline. Introduction IP Multicast Reference Network Scenario UMTS / xDSL / WiMAX

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Admission Control in IP Multicast over Heterogeneous Access Networks

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  1. Admission Control in IP Multicast over Heterogeneous Access Networks Pedro Santos (PT Inovação) António Pinto, Manuel Ricardo (INESC Porto) FransciscoFontes, Teresa Almeida (PT Inovação)

  2. Outline • Introduction • IP Multicast • Reference Network Scenario • UMTS / xDSL / WiMAX • Proposed Solution • Results • Conclusions NGMAST'08

  3. Introduction • The general goals of this project were: • To design a solution capable of performing • multicast receiver access control (e.g. TV channels) • multicast sender access control (e.g. User generated content) • ... in an heterogeneous access network scenario • Implement a prototype for validation purposes NGMAST'08

  4. IP Multicast • One data stream per group of receivers • Packet replication done by network nodes • Multicast groups represented by IP addresses • (* ,G)  Any-Source Multicast (ASM) • (S,G)  Source-Specific Multicast (SSM) • Group management • IPv4  Internet Group Management Protocol (IGMP) • IPv6  Multicast Listener Discovery (MLD) • Forwarding protocols • Protocol Independent Multicast (PIM-SM/SSM/BiDir) • Distance Vector MulticastRoutingProtocol (DVMRP) NGMAST'08

  5. IP Multicast NGMAST'08

  6. IP Multicast • IP Multicast  Open architecture • Receivers are free to join any group • Sources are free to transmit to any group • Makes IP multicast-based commercial services difficult to implement • Solutions • End-to-end encryption of data streams • Control access to multicast sessions NGMAST'08

  7. Objectives • IP multicast streaming over heterogeneous access networks • UMTS, xDSL, WiMAX • Identify network nodes where to perform • access control • authorization • resource management • Support for multicast sources • in the core network (known & authorized SP) • in the access network (user generated content) • Authentication, authorization and record of multicast sessions • Implement a prototype to validate the proposed solution NGMAST'08

  8. Reference Network Scenario NGMAST'08

  9. UMTS • GGSN  Multicast router • Native multicast support • MultimediaBroadcast/MulticastService (MBMS) • New functional element (BM-SC) • Inter-operable with IP Multicast (IGMP & IPv4 Class D) • Only for downstream traffic • The reference point from the content provider to the BM-SC is not standardised by 3GPP in this release of the specification. “3GPP TS 23.246 v8.2.0” NGMAST'08

  10. xDSL • BNG/BRAS  Multicast router • DSL-Forum TR-101 – Two Connection types • PPPoE • Point-to-point connection CPE  BNG • Packet replication done at the BNG  Access control to multicast flows @ BNG • IPoE • Every network element performs packet replication • L2 control over packet replication necessary at the DSLAM  Access control to multicast flows @ BNG and DSLAM NGMAST'08

  11. WiMAX • ASN-GW  Multicast router • SS  ASN-GW connection • Identified by a 16bit number (CID) • Upstream unicast connections (exclusively) • Downstream multicast connections possible (mCID) but... • mCID are unidirectional in nature • not fitted for power-conservative systems • only efficient for large groups (nº of subscribed SSs)  Access control to multicast flows @ ASN-GW NGMAST'08

  12. Proposed Solution • User authentication • Done at network attachment • Access control done at the network access node • Members detection  IGMP messages • Sources detection  UDP multicast messages • Access Authorization  AAA server • Policy Enforcement  Access Control Lists (ACLs) • Multicast profile per user/subscriber • Multicast session id • IP header  Source address (SA), destination address (DA) • IGMP message  Group source address (GSA), group destination address (GDA) NGMAST'08

  13. Multicast Control - MSC NGMAST'08

  14. Prototype (Multicast Controller) NGMAST'08

  15. Results • Multicast controller basic functionalities • authenticated user detection/verification • detection of multicast join/leave messages • detection of multicast source transmissions • multicast authorization checks • multicast traffic filtering (according to authZ checks) • Successful functional validation • authorized/unauthorized group join request • multicast transmission to an authorized/unauthorized group • unauthorize a source/member after transmission/reception has begun • Processed up to 1250 IGMP requests/sec NGMAST'08

  16. Conclusions • Multicast control done at access node • GGSN (UMTS) • BNG or BNG & DSLAM (xDSL) • ASN-GW (WiMAX) • Application & Network agnostic • No changes needed to applications or network protocols • Minimal user impact (only network elements are affected) • Access control done at network layer • ... L2 control may be required (If L2 packet replication) • Access control is subscriber “centric” NGMAST'08

  17. Questions ? NGMAST'08

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