ngn- interconnection s. k. gupta, advisor (cn&it) telecom regulatory authority of india
TRANSCRIPT
NGN- NGN- InterconnectionInterconnection
S. K. Gupta, Advisor (CN&IT)Telecom Regulatory Authority of India
AgendaAgenda
NGN- Interconnection Issues NGN- Interconnection Issues
10/04/23 2TRAI
Way forwardWay forward
NGN- Interconnection NGN- Interconnection issues 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
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
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
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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
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
10/04/23 4TRAI
NGN- Interconnection NGN- Interconnection issues issues
Present NetworksCompatibility mainly addressed by service specific networks
NGNCompatibility at UNI, NNI is crucial due to high flexibility
NGN- Interconnection NGN- Interconnection issues 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
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
10/04/23 5TRAI
NGN- Interconnection NGN- Interconnection issues issues
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
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- TDM◦ TDM – NGN ◦ NGN – NGN
Interconnection evolution ◦ TDM- TDM◦ TDM – NGN ◦ NGN – NGN
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Related Issues ◦ Point of centralized
interconnection ◦ Ensuring security at
interconnect point◦ Funding and management
of interconnect exchange ◦ Ensuring QoS at
interconnection ◦ Effective resource
management
Related Issues ◦ Point of centralized
interconnection ◦ Ensuring security at
interconnect point◦ Funding and management
of interconnect exchange ◦ Ensuring QoS at
interconnection ◦ Effective resource
management
NGN- Interconnection NGN- Interconnection issues 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)
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
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
10/04/23 7TRAI
NGN- Interconnection NGN- Interconnection issues 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
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.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
H.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
10/04/23 8TRAI
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
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
NGN: Session Border NGN: Session Border ControllerControllerNGN 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
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
Session Border
Controller is a
Solution
10/04/23 9TRAI
NGN: Session Border NGN: Session Border ControllerController
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
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
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
10/04/23 10TRAI
NGN: Session Border NGN: Session Border ControllerController
10/04/23 11TRAI
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
NGN- Interconnection NGN- Interconnection issues 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 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.
NGN should support: ◦ Number portability◦ Carrier Selection etc.
10/04/23 12TRAI
Probable NGN addressing : ◦ IPv4 /IPv6 addresses ◦ Domain Name Server◦ Uniform Resource Identifier
(URI) etc.
Probable NGN addressing : ◦ IPv4 /IPv6 addresses ◦ Domain Name Server◦ Uniform Resource Identifier
(URI) etc.
NGN- Interconnection NGN- Interconnection issues issues Measurement and
accounting of traffic :◦NGN-NGN ◦Application
provider- NGN ◦NGN - End user
for different applications
Charging on functional and application basis
Measurement and accounting of traffic :◦NGN-NGN ◦Application
provider- NGN ◦NGN - End user
for different applications
Charging on functional and application basis
10/04/23 13TRAI
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
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
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
Way ForwardWay 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.
10/04/23 14TRAI
Thank YouS K Gupta , Advisor, TRAI
Mahanagar Doorsanchar Bhawan,J.L. Nehru Marg, New Delhi – 110002
Ph. +91-11- 23217914 (O)+91-11- 23211998 (Fax)
10/04/23 15TRAI