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NGN- Interconnection

NGN- Interconnection. S. K. Gupta, Advisor (CN&IT) Telecom Regulatory Authority of India. Agenda. NGN- Interconnection Issues. Way forward. NGN- Interconnection issues. Interconnection among networks is necessary to ensure end-to-end services to the subscribers

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NGN- Interconnection

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  1. NGN- Interconnection S. K. Gupta, Advisor (CN&IT) Telecom Regulatory Authority of India

  2. Agenda NGN- Interconnection Issues • Way forward TRAI

  3. NGN- Interconnection issues • Interconnection among networks is necessary to ensure end-to-end services to the subscribers • TDM based interconnection is simple and well defined • Multiservice IP Based interconnection is complex • Well defined regulatory framework to ensure effective interconnection among service providers is necessary to promote competition and reduce entry barriers TDM based interconnection • Hierarchical points of interconnection • Use of standard SS7 signaling • Interconnection to primarily support voice calls • Pre-determined routing of calls based on dialed numbers NGN based interconnection • Flat interconnection • Use of different signaling and protocols to support multiple services • Interconnection needs to supports multiple services • Dynamic policy based traffic routing TRAI

  4. NGN- Interconnection issues Present Networks Compatibility mainly addressed by service specific networks NGN Compatibility at UNI, NNI is crucial due to high flexibility TRAI

  5. NGN- Interconnection issues • NGN is considered as converged network aggregating different functionalities of existing network with common IP backbone • It looks simple in theory but implementation is complex • Challenges : • Interoperability among networks using multiple protocols • Implementing open interface between application & network and delivering end-to-end service with defined QoS parameters TRAI

  6. NGN- Interconnection issues • Point of interconnection • Centralized vs. Hierarchical • Peer to Peer vs. Interconnect Exchange • Support for existing TDM Networks • Time frame for co-existence of TDM & NGN before complete migration to NGN • Revised Interconnect Offer • Model of physical Interconnection Interconnection evolution • TDM- TDM • TDM – NGN • NGN – NGN Related Issues • Point of centralized interconnection • Ensuring security at interconnect point • Funding and management of interconnect exchange • Ensuring QoS at interconnection • Effective resource management TRAI

  7. NGN- Interconnection issues • Signaling requirement • Support for signaling protocols to suit present network requirements and future service requirement at interconnection. Presently SS7 is standard signaling protocol in TDM networks. • Signaling has to be deliberated at • Network-Network Interface (NNI) level • User -Network Interface level (UNI) • Application- Network Interface (ANI) level • Between Gateway and Session Border Controller (SBC) Typical NGN Signaling • NNI : SIP-1, BICC and H.323 • Physical interface : SDH or Gigabit Ethernet • Within Networks : MPLS, RPR • ANI: SIP, INAP, SMTP, FTP • Media Gateway: H.248 • Media Signaling Gateways : SIGTRAN TRAI

  8. NGN- Interconnection issues • Compatibility Issue: • Different protocols used in NGN has been developed with different approach • Number of functionalities have been left as optional • Ensuring end-to-end services using optional protocol functionalities by few vendors may be difficult • Protocol translation for such optional facilities by session border controller is a challenge H.323 • It is umbrella specification defined by ITU and consists of • H.225 RAS Signalling • H.245 Control Signaling • H. 450 Supplementary services • Other standards for voice and video SIP • It is created by Internet Engineering Task Force (IETF) as RFC 2543 • Provide advance signalling and control functionalities • Uses RTP/RTCP for real time data transmission 8 05/11/2014 TRAI

  9. NGN: Session Border Controller • NGN network require: • Physical Interpretabilities with different networks using different interfaces • Isolation of network from others in case of attacks/networks related problem • Support for variety of protocols for different services • Flexibility of designing network topology and resource management within network • Facilitate effective communication with other network Session Border Controller is a Solution 9 05/11/2014 TRAI

  10. NGN: Session Border Controller Role of SBC • Managing signaling and media paths for a multimedia session • Scalability of wider range of applications over networks • Provide comprehensive security and ways to monetize running services • Regulatory provisions such as Lawful interception • Honoring SLAs with peers and customers • SBC is ideally situated to interconnect disparate networks and provides following capabilities: • Connectivity • Network Address Translation • Security • Policy Enforcement and QoS control • Regulatory Compliance • Billing TRAI

  11. NGN: Session Border Controller • SBC deployment approaches in service providers networks includes : • Service provider-to- service Provider Interconnect • Service Provider-to-Enterprise Peering • Service Provider-to-Residential Interconnect Source: www.cisco.com TRAI

  12. NGN- Interconnection issues • NGN may enable more services leading to additional functional flexibility . • Numbering/addressing to be used in NGN shall complement and support existing numbering scheme. • National numbering plans may need modification. NGN should support: • Number portability • Carrier Selection etc. Probable NGN addressing : • IPv4 /IPv6 addresses • Domain Name Server • Uniform Resource Identifier (URI) etc. TRAI

  13. NGN- Interconnection issues • Measurement and accounting of traffic : • NGN-NGN • Application provider- NGN • NGN - End user for different applications • Charging on functional and application basis Inter-operator Compensation : • Charging for QoS, BW, application at interconnect points Typical NGN charging : • CPNP , Bill and Keep, QoS based Charging • Volume and Hit based charging NGN Charging challenges: • Lower cost more functionality • Sharing of Intelligent networks • Benefits of distinction between transport and services • Reconciliation of application / content providers charges in • “on-deck” scenario • “ off-deck” scenario TRAI

  14. Way Forward • Need for close coordination of relevant groups to develop region specific understanding on parameter left for country specific needs/ future requirement • Development of local certifying agencies / test labs for interface approval • Mandate use of only approved interfaces in NGN networks • Close coordination with vendors to overcome bottleneck and foster competition. TRAI

  15. Thank You S K Gupta , Advisor, TRAI Mahanagar Doorsanchar Bhawan, J.L. Nehru Marg, New Delhi – 110002 Ph. +91-11- 23217914 (O) +91-11- 23211998 (Fax) advcn@trai.gov.in TRAI

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