NGN- Interconnection

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NGN- Interconnection

• S. K. Gupta, Advisor (CNIT)
• Telecom Regulatory Authority of India

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Agenda

• NGN- Interconnection Issues

Way forward
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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

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NGN- Interconnection issues

• Present Networks
• Compatibility mainly addressed by service
  specific networks

• NGN
• Compatibility at UNI, NNI is crucial due to high
  flexibility

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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

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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

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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

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NGN- Interconnection issues

• 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

• 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

• 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

02/06/2020
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TRAI
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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

02/06/2020
9
TRAI
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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

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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
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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.

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NGN- Interconnection issues

• 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

• Measurement and accounting of traffic
• NGN-NGN
• Application provider- NGN
• NGN - End user for different applications
• Charging on functional and application basis

• 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

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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.

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• 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_at_trai.gov.in