NGN- Interconnection

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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 - PowerPoint PPT Presentation

Text of NGN- Interconnection

  • NGN- InterconnectionS. K. Gupta, Advisor (CN&IT)Telecom Regulatory Authority of India

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  • NGN- Interconnection Issues **TRAIWay forward

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  • Interconnection among networks is necessary to ensure end-to-end services to the subscribersTDM based interconnection is simple and well definedMultiservice IP Based interconnection is complexWell defined regulatory framework to ensure effective interconnection among service providers is necessary to promote competition and reduce entry barriers TDM based interconnectionHierarchical points of interconnectionUse of standard SS7 signaling Interconnection to primarily support voice callsPre-determined routing of calls based on dialed numbers

    **TRAINGN based interconnectionFlat interconnectionUse of different signaling and protocols to support multiple services Interconnection needs to supports multiple services Dynamic policy based traffic routing

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  • **TRAIPresent NetworksCompatibility mainly addressed by service specific networks NGNCompatibility at UNI, NNI is crucial due to high flexibility

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

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  • Point of interconnection Centralized vs. Hierarchical Peer to Peer vs. Interconnect ExchangeSupport for existing TDM NetworksTime frame for co-existence of TDM & NGN before complete migration to NGN Revised Interconnect OfferModel of physical Interconnection

    Interconnection evolution TDM- TDMTDM NGN NGN NGN

    **TRAIRelated Issues Point of centralized interconnection Ensuring security at interconnect pointFunding and management of interconnect exchange Ensuring QoS at interconnection Effective resource management

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  • Signaling requirementSupport 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) levelBetween Gateway and Session Border Controller (SBC) Typical NGN Signaling NNI : SIP-1, BICC and H.323 Physical interface : SDH or Gigabit EthernetWithin Networks : MPLS, RPR ANI: SIP, INAP, SMTP, FTP Media Gateway: H.248Media Signaling Gateways : SIGTRAN

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  • Compatibility Issue:Different protocols used in NGN has been developed with different approachNumber of functionalities have been left as optional Ensuring end-to-end services using optional protocol functionalities by few vendors may be difficultProtocol translation for such optional facilities by session border controller is a challengeH.323It 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**TRAISIP It is created by Internet Engineering Task Force (IETF) as RFC 2543Provide advance signalling and control functionalities Uses RTP/RTCP for real time data transmission

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  • NGN network require:Physical Interpretabilities with different networks using different interfaces Isolation of network from others in case of attacks/networks related problemSupport for variety of protocols for different services Flexibility of designing network topology and resource management within networkFacilitate effective communication with other network

    Session Border Controller is a Solution**TRAI

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  • Role of SBC Managing signaling and media paths for a multimedia sessionScalability 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 customersSBC is ideally situated to interconnect disparate networks and provides following capabilities: ConnectivityNetwork Address Translation SecurityPolicy Enforcement and QoS controlRegulatory Compliance Billing **TRAI

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  • **TRAISBC 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

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  • 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 portabilityCarrier Selection etc.

    **TRAIProbable NGN addressing : IPv4 /IPv6 addresses Domain Name ServerUniform Resource Identifier (URI) etc.

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  • Measurement and accounting of traffic :NGN-NGN Application provider- NGN NGN - End user for different applicationsCharging on functional and application basis**TRAIInter-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 functionalitySharing of Intelligent networksBenefits of distinction between transport and services Reconciliation of application / content providers charges in on-deck scenario off-deck scenario

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  • 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 approvalMandate use of only approved interfaces in NGN networks Close coordination with vendors to overcome bottleneck and foster competition.**TRAI

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