NTT s Initiatives for NGN June 19, 2007 Atsushi Hiramatsu Nippon Telegraph and Telephone Corporation 1
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(Released in November 2004) 6
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Roadmap for building the NGN 8
NTT Otemachi Showroom for NGN field trial 9
NTT s technologies for NGN 10
NGN architecture overview at ITU-T Applications ANI Application support functions & service support functions Management functions End-user functions Service stratum Transport user profiles Service user prifiles Network attachment control functions Service control funictions Resource and admission control functions Transport control functions Other networks UNI Transport stratum Transport control functions NNI Control Media Management 11
Overview of NGN field trials UNI : User-Network Interface IP-broadcast server VoD server Application server NNI : Network-Network Interface SNI : Application Server-Network Interface SNI NGN trial network NGN IP networks of other companies Multicast communication (unidirectional) Interactive (unicast) communication (unidrectional) Interactive (unicast) communication (bidirectional) PPPoE connection ISPs, etc. UNI NNI Terminals Terminals 12
Communication functions and service examples in field trails Communication functions Service category QoS class Bandwidth (codec) Interactive (unicast) communication (bidirectional) IP telephony (with 0AB-J phone number) Highest priority Wideband speech: 7kHz (G.722, etc) Narrowband speech: 3.4kHz (G.711) Video telephony (with 0AB-J phone number) Highest priority SDTV class (MPEG4): 2 Mb/s HDTV class (MPEG2): 30 Mb/s Interactive (unicast) communication (unidirectional) Video delivery (VoD / IP broadcast) High priority SDTV class (MPEG2): 6 Mb/s HDTV class (H.264): 10 Mb/s Multicast communication (unidirectional) Best effort PPPoE connection ISP connection Best effort 13
QoS objectives in NGN field trials Class Highest-priority High-priority Priority Diffserv mapping EF AF(high) AF(low) Interactive (unicast) IP-packet transfer delay IP-packet trnasfer delay variation IP-packet loss ratio 70ms (UNI-UNI) 20ms (UNI-UNI) 0.1% (UNI-UNI) 200ms (UNI-UNI) 200ms (UNI-UNI) 0.1% (UNI-UNI) NOT specified NOT specified * IP-packet transfer delay 400ms (UNI-SNI) Multicast IP-packet transfer delay variation 200ms (UNI-SNI) IP-packet loss ratio 0.1% (UNI-SNI) *Priority-class traffic is given priority over best-effort class by packet transfer processing in the network 14
Quality in telecommunication services Service quality (in a broad sense) Example: Customer satisfaction (difference between user expectations and customer-service response) Quailty of experience Examples: Articulation in voice, block noise in video Network performance Examples: Delay, loss, frequency of faults in equipment UNI Telecommunication network UNI 15
QoS regulations for IP telephony using 0AB-J phone numbers Popular IP telephony terminal UNI QoS objectives between UNI and UNI IP-packet transfer delay: 70 ms max. IP-packet transfer delay variation: 20 ms max. IP-packet loss ratio: 0.1% max. Carrier A s IP network UNI Popular telephony terminal NNI (Interconnection on IP-layer) QoS objectives between UNI and NNI IP-packet transfer delay: 50 ms max. IP-packet transfer delay variation: 10 ms max. IP-packet loss ratio: 0.05% max. Carrier B s IP network From: Next Generation IP Network Promotion Forum, Japan 16
NTT Research and Development for NGN Platform/application technologies IP broadcast server Service control layer VoD server Authentication/ time-certification SNI Server platform technologies Session control server Various network control servers Transport network layer ISP Large-capacity router ROADM Service edge system Transport-system technologies Transmissionsystem technologies Large-capacity router ROADM Service edge system Gateway systems Ethernet edge system NNI PSTN Other IPphone network GE-PON ONU Optical access technologies GE-PON ONU Ethernet-system technologies IP phone HGW Information appliances HGW UNI GE-PON: gigabit Ethernet passive optical network ONU: optical network unit HGW: home gateway PSTN: public switched telephone network 17
Architecture for NGN service control server APL Middleware Operating system Hardware Next-generation server applications High-availability middleware CGL ATCA Use Use high-availability high-availability middleware middleware Use Use of of CGL CGL (Carrier (CarrierGrade GradeLinux) Use Use of of standard standard hardware hardware platform platform (ATCA) (ATCA) 18
Basic architecture for QoS control Admission control function: The session control server determines the network resources needed and controls service edge systems Session control server Highest-priority class High-priority class Passes only traffic within permitted bandwidth Priority class Blocks excessive traffic Service edge system Large-capacity core node Best-effort class Large-capacity core node Service edge system Traffic monitoring/control function: Prevents traffic exceeding allocated bandwidth from flowing into the network 19
Admission control in the NGN New session request New session request Highpriority class (1) Link bandwidth Highpriority class (1) Link bandwidth Highpriority class (1) Link bandwidth Best effort Highpriority class (2) Best effort Highpriority class (3) High- Priority class (2) Best effort Because bandwidth for two high-priority-class sessions is available, the session request is accepted. The quality of the best-effort class may deteriorate when the bandwidth becomes insufficient. The request for a third highpriority-class session is rejected due to insufficient bandwidth. 20
Home network configuration for field trail monitor users 21
High-definition video distribution services 22
IP retransmission service for terrestrial digital broadcasting 23
Thank you! I hope you will enjoy the visit to our Otemachi showroom on Thursday. Reference: NTT Financial report on November 2006 (www.ntt.co.jp) NTT Technical Review on June 2007 (www.ntt-review.jp) 24