2. Definición/características:
Red basada en transferencia de paquetes.
Separa funciones de control de transporte, llamada/sesión y
aplicación/servicio..
Separa la prestación del servicio del transporte y usa interfaces abiertas.
Soporta movilidad generalizada.
Objetivos:
Promover una competencia justa.
Alentar la inversión privada.
Acceso abierto a las redes.
“Redes de Próxima Generación NGN…”
Fuente: UIT-T Rec Y.2001 (12/2004).
3. NGN
Modelo Distribuido
“Redes de Próxima Generación NGN…”
PSTN
Modelo Centralizado
GESTIÓN Y PLATAFORMAS
CONTROL DE LLAMADAS
Señalización SS7, R2, PRI
CONMUTACIÓN
Por Time Slots
POTS
CENTRAL
TELEFÓNICA
TRONCALES
BUCLE DE ABONADO Y
TRONCALES
CentralTelefónica
Fuente: IUT-T Recomendación Y.2012. Adaptado por el autor
CAPA DE
CONTROL DE RED
Service
Stratum
CAPA DE CONMUTACIÓN DE
PAQUETES
(CORE IP)
Tranport
Stratum
POTS
CAPA DE ACCESO
PSNTN / PLMN
NNI
Network Network Interface
TRONCALES
SIP H323 Softphone
UNI
User Network Interface
USUARIOS
CAPA GESTIÓN DE
SERVICIOS
ANI
Application Network Interface
4. “Redes de Próxima Generación NGN…”
CORE IPCAPA DE TRANSPORTE
(CONMUTACIÓN DE PAQUETES IP)
CAPA DE GESTIÓN DE SERVICIOS
iOSS
Servidor de
Políticas
Servidor de
Aplicaciones
Servidor de
Localización
Servidor
RADIUS
MRS SCP
CAPA DE CONTROL DE RED
SOFTSWITCH SOFTSWITCH
CAPA DE ACCESO
POTS SIP H323 Softphone
AMG
IAD
MTA
TMG/UMGSG TMG/UMG
Fuente: Huawei Technologies Co. Ltd (Adaptado por el autor)
5. “Redes de Próxima Generación NGN…”
CORE IP
CAPA DE CONTROL DE RED
CAPA DE TRANSPORTE
(CONMUTACIÓN DE PAQUETES IP)
CAPA DE ACCESO
SIP H323 Softphone
AMG
IAD
MTA
TMG/UMGSG TMG/UMG
SOFTSWITCH SOFTSWITCH
ABONADO
A
ABONADO
B
Fuente: Huawei Technologies Co. Ltd (Adaptado por el autor)
7. “Redes de Próxima Generación NGN…”
Packet Core Network
MGW
Soft-phone
SIP-T/BICC
Softswitch
IAD
AMG
Softswitch
Fuente: Huawei Technologies Co. Ltd. (Modificado por el autor)
POTS
AMG
POTS
….
H.248
H.248
H.248
IUA
UMG
PBXPBXPBX
PRI/R2
SIP
IP PBX
SWITCH
H.248
M3UA
M2UA
SCTP
SIP
SS7
SBC
8. QoS de una red IP para servicios NGN
Packet delay (Voz: 150 ms), Jitter (Voz: 30ms), Packet loss (Voz: 1%)
Out of secuence packets, Jitter buffer misconfiguration
Codec G729
Frame size 50 pps (20ms), total overhead 58 bytes,Voice payload 20 bytes,
Total bandwidh 31.2Kbs (G.711: 87,2Kbps)
Versiones: G.729 A, B, D y E.Verificar Annexb=no o yes.
Media atrribute rtpmap=18, G729/8000
Capturar senalización y voz usando wireshark y verificar packet
time, Delay, Jitter
“Redes de Próxima Generación NGN…”
9. Objetivo:Transmitir llamadas de voz usando enlaces de 5.5Kbps
60% de conversación es silencio.VAD y CNG para ahorrar BW.
Usando cRTP (Compressed RealTime Protocol) se reduce IP
overhead de 40 a 2 4 bytes
The impact of packet loss on perceived speech quality depends on
several factors, including loss pattern, codec type, and packet loss
size. It may also depend on the location of loss within the speech.
Conclusion: Bit rate 5.3 Kbps is better than 8Kbps, 6Kbps and
4.8Kbps at low bandwidth area.Generally 8Kbps is used, however
if ~5Kbps is used, will save 33% bandwidth per call.
“Redes de Próxima Generación NGN…”
Packet-based transfer...NGNs remove the circuit switching of traditional PSTN/ISDN networks, and unify all switching using a combination of connectionless layer 2 switching (for example carrier Ethernet), connection-oriented layer 2 switching (MPLS, or in some cases ATM or 802.3ag), and layer 3 routing (using the IP protocol)
Separation of control functions among bearer capabilities, call/session, and application/ service...traditional services such as PSTN or Frame Relay implemented all elements of the service on all nodes; a PSTN switch had to transport the caller's voice (the bearer part), control the establishment and release of calls (the call/session control part) and either implement or trigger advanced services (such as number translation or portability). In an NGN, these functions are separate; transport of the voice and signalling is across a common packet-switched network dedicated to multi-service transport, call/session control is carried out by centralised servers (perhaps IMS-based), and advanced services are triggered from the call/session control servers and implemented on separate application servers which can be remote from the other elements.
Decoupling of service provision from network, and provision of open interfaces...in an NGN, the network must be capable of supporting a range of applications in terms of bandwidth and QoS; however the network need not be aware of the specific applications, just the bandwidth and QoS requirements they place upon the network. By the same reasoning, applications can be developed and deployed across this common infrastructure, provided they can request bandwidth and QoS from the transport network by some means, without requiring any new capability from the transport network.
Generalized mobility...as access to core network services becomes more generalised (see next point), it is necessary to manage mobility between service providers and between access points into the service provider network.
MTA: Multimedia Terminal Adapter
AMG: Access Media Gateway
IAD: Integrated Access Device
SG: Signaling Gateway
UMG: Universal Media Gateway
TMG: Trunk Media Gateway
AppServer: Application Server (produces and manages logics of value-added services and intelligent network (IN) services, providing a platform for a third party to develop services through the open APIs)
Location Server: (manages the routes between the softswitches. It indicates the coverage of call destinations and ensures the efficiency of call routing. The location server prevents the routing table from being oversize, and also simplifies the routing)
MTA: Multimedia Terminal Adapter
AMG: Access Media Gateway
IAD: Integrated Access Device
SG: Signaling Gateway
UMG: Universal Media Gateway
TMG: Trunk Media Gateway
IN: Intelligent Network
MRS: Media Resource Server
iOSS: Integrated operation support system
AppServer: Application Server (produces and manages logics of value-added services and intelligent network (IN) services, providing a platform for a third party to develop services through the open APIs)
Location Server: (manages the routes between the softswitches. It indicates the coverage of call destinations and ensures the efficiency of call routing. The location server prevents the routing table from being oversize, and also simplifies the routing)
PARLAY: El grupo Parlay es un consorcio industrial y tecnológico (fundado en 1998) que se dedica a especificar APIs para redes telefónicas.
INAP: Intelligent Network Application Protocol
TRIP: Telephony Routing over IP. for advertising the reachability of telephony destinations between location servers, and for advertising attributes of the routes to those destinations.
SNMP: Simple Network Management Protocol
MML: Main Machine Language
SG: Signaling Gateway
UMG: Universal Media Gateway
TMG: Trunk Media Gateway
IN: Intelligent Network
MRS: Media Resource Server
iOSS: Integrated operation support system
MTA: Media Terminal Adapter
IAD: Integrated Access Device
TRIP: Multimedia Terminal Adapter
AMG: Access Media Gateway
IAD: Integrated Access Device
SG: Signaling Gateway
UMG: Universal Media Gateway
TMG: Trunk Media Gateway
IN: Intelligent Network
MRS: Media Resource Server
iOSS: Integrated operation support system
MTA: Media Terminal Adapter
IAD: Integrated Access Device
TRIP: Multimedia Terminal Adapter
AMG: Access Media Gateway
IAD: Integrated Access Device
SG: Signaling Gateway
UMG: Universal Media Gateway
TMG: Trunk Media Gateway
IN: Intelligent Network
MRS: Media Resource Server
iOSS: Integrated operation support system
MTA: Media Terminal Adapter
IAD: Integrated Access Device
TRIP: Multimedia Terminal Adapter
AMG: Access Media Gateway
IAD: Integrated Access Device
SG: Signaling Gateway
UMG: Universal Media Gateway
TMG: Trunk Media Gateway
IN: Intelligent Network
MRS: Media Resource Server
iOSS: Integrated operation support system
MTA: Media Terminal Adapter
IAD: Integrated Access Device
TRIP: Multimedia Terminal Adapter
AMG: Access Media Gateway
IAD: Integrated Access Device
SG: Signaling Gateway
UMG: Universal Media Gateway
TMG: Trunk Media Gateway
IN: Intelligent Network
MRS: Media Resource Server
iOSS: Integrated operation support system
MTA: Media Terminal Adapter
IAD: Integrated Access Device
TRIP: Multimedia Terminal Adapter
AMG: Access Media Gateway
IAD: Integrated Access Device
SG: Signaling Gateway
UMG: Universal Media Gateway
TMG: Trunk Media Gateway
El Desarrollo de habilidades básicas de pensamiento estratégico es la tarea que presentamos a continuación el grupo ARBOOK conformado por Carlos Herrera, Edman Guillca y Jose Cobeña