The main content of the next generation of telecommunications network (NGN), the main content of NGN. Tripphi 3. Domestic and foreign status is evolved to the NGN network. NGN and other networks interconnect. Trungestal. The development trend is seven. NGN / soft exchange standard research work 1. NGN characteristics 1. Communication network change ◆ The development of communication network will be developed from the past single network to the integrated direction ◆ Communication network business is also a corresponding transformation voice The main transition is dominant; telephone network transmission data is transformed into data network transmission; the wireless wireless fusion; ◆ Network to broadband, packetization evolution ◆ IP technology is gradually mature, IP network is also initially ubiquitous ◆ Communication network meets ready-time business Generation ◆ Integrated multi-service will become the development direction of communication network ◆ The telecommunications industry has changed from the competition of the network into business. 2. The characteristics of NGN • Next Generation Telecom NGN is a generalized concept, it contains the network being happening Multiple changes in building methods. - From the business, NGN supports voice, video, and multimedia services. - From the web, NGN contains business networks and transfer networks, covering core networks and edge networks. • NGN has the following three characteristics: • First, the NGN network structure pair voice and data adopts a packet-based transmission mode and adopts a unified protocol. • Second, NGN is also a network that is independent of the network, and implements a relatively independent business system through business and call control and call control and bearer separation, allowing business and networks to provide and independently. • Third, NGN implements interworking with existing networks, such as PSTN, ISDN, and GSM, by gateway devices, and NGN also supports existing terminals and IP intelligent terminals. Traditional voice network signaling network Next generation network (NGN) architecture database Softswitch business platform OSS business layer control layer Core Packet network signaling gateway marginal layer core layer media gateway Packet Voice Network Packet Access device SoftSwitch-Edge layer: through various The access means connects the various types of users to the network and converts the information format to the information format capable of transmitting on the network, for example: dividing voice signals into an ATM cell or IP packet. - Transmission layer: Packet technology can be provided with a unified delivery platform with QoS assurance, high reliability, and large capacity. - Control layer: Complete the basic real-time call control and switch-on control functions that are independent of the business, the purpose is to dominate network resources. Softswate can support various protocol interfaces, such as H.323, H.248, SIP, BICC, SigTRAN, and MGCP, and the like. - Application / Business Layer: Includes: 1. Operation Maintenance Support System OSS / BSS, including network management system, business management system, billing account system, customer service system, policy server, authentication, authentication, and charging server (ie AAA) server). 2. Additional value-added services provided on the basis of calls, via SCP, APP Server. It is also possible to provide an open business interface to third-party manufacturers, which is developed by third parties. II. Current status at home and abroad • NGN is currently the hot technology of operators and equipment manufacturers in discussing, and many of the foreign standardization organizations and forums include IUT-T, IETF, ETSI, 3GPP, 3GPP2, etc.. • ITU-T believe that NGN is the specific implementation of GII, which represents the global infrastructure GII. The development trend of network fusion, and its implementation is a variety of diverse, network interoperability and business interoperability is the key content of NGN research, NGN architecture will It is hierarchical. • ITU-T believe that NGN is a specific implementation of GII of the Global Infrastructure. • ITU-T Section 13 has begun to prepare and organize the implementation of NGN standardization projects, and will complete the project definition stage in November 2002. In 2004, the comprehensive definition of NGN's connotation, related network system models, and implementation guides.
• ITU-T and ETSI discussions related to NGNs should have key technical issues containing the following areas: 1) Architecture and protocol: Studies to determine NGN network systems and reference models; study NGN's protocol layered system to reflect NGN business and network Separation characteristics; research based on GMPLS control and protocol system; research optical VPN architecture and protocol; consider using common reference model to identify communication processes needed to support NGNs between operators or operators; define and traditional terminal Required interworking; define BICC protocols for relay levels; determine how to support end-to-end service, call control, and user mobility. 2) Network control and end-end QoS: research and definition QoS traffic volume engineering requirements; research based on GMPLS / Ethernet transfer of OAM and link control protocols; complete end-to-end QoS level for voice, study for end End Multimedia Business QoS level requirements and QoS level requirements for their respective media components; how to use the QoS mechanism of the network low-level QoS mechanism to obtain high-rise QoS; study the low-rise QoS control mechanism of operational business; study QoS end user rules; research transmission network scale The impact of QoS and the input online transmission of calls on QoS, and so on. 3) Network management: An important condition for implementing NGN networks is that there must be an appropriate network management solution. Since NGN is based on open interface and allows different types of services to enter a network, network management must be in multi-manufacturers and multi-services. In the environment, it is necessary to define basic network management services and interfaces that apply to NGN requirements (fault management, performance management, user management, billing management, traffic, and routing management, etc.); the system of perfect and enhance core network management Wait. 4) Network security: One feature of the NGN network is that an open interface increases, and the risk of security is also increased accordingly. It is necessary to develop NGN security systems and operational safety guides; develop NGNs required for specific security required Agreement, API, and tools, such as encryption, information summary, and digital signatures. 5) Other issues: research meetings and call management; billing mechanisms (collecting and event detailed records); account network resource policy management, etc.), research support emergency call services and priority services, and study NGN network Address, etc.
Open platformNetwork control
Provider's requirements • Cost effective investment with maximizing ability of sharingnetwork between providers • Provide open interface platform between services andnetwork resources available to any third party providers • Provide integrated billing system between providers • Support mobility and roaming capabilitiesApplicationLayerControlBearerService ControlLayer SoftswitchControlIP ServiceSwitchingApplicationServicesNetwork TransportLayerPSTNInternetMultiservicePacket SwitchingX XX XXCore networkXOptical CoreBroadbandAccessGbE GbEDSLAM DSLAMAccessNetworkRAS RASFrame / ATMFrame / ATMWireless WirelessCPE CPEMediaGatewaysMetro OpticalXX XXPast: Seper of Voice & Data Transp.Circuit Switch.Access Capa.Circuit Switch.Transp Capa.Packet Switch.Transp Capa.Near Past:... Sep. of V & D AccessCircuit .. Switch.Access Capa.Circuit Switch.Transp Capa.Packet Switch.Transp Capa.Packet Switch.Access Capa.Present: Integration of V & D TransportCircuit Switch.Access Capa.Circuit Switch.Transp Capa.Pack. Et Switch.Transp. Capa.packet switch.access Capa.Future: Integration of V &
D Access and Transp.Packet Switch.Transp. Capa.Packet Switch.Access Capa. • NGN Opportunities exists TODAY for Mobile networks • All 3G standards definitions include options for NGN- UMTS, CDMA 2000 • New wireless data services demand network QoS- QoS / SLA, address management, service class management, dynamic bandwidths allocation, data service charging, flexible billing mechanisms (pre-paid, micro-payment) - Openess of data stream control layer towards data applicationlayer • Seamless convergence of mobile circuit services with newmanaged data applications into one common NGN architecture- Voice becomes data traffic- QoS-sensitive data traffic principally under full network controlNGN for MobileGSM Transit offload with IP based HLRM1PSTNLong DistanceGSM MSCGSM MSC Cellular NWCellular NWFixed NWFixed NWF1F2M2SS7 Signaling GWTrunking GWTrunking GWGMSC SoftswitchManaged IPCore Network HLRMobileFeature ServerTEXTEXUMTS R5 (All IP) UMTS R4 NGNUMTSTARTINGPOINTUMTSFINALTARGETM SCS ERVE RA ND G WM Ultimedia C Al LS ERVERAND V O I PG WG PRSR 0 03g Mobile Network EvolutionM Ultimedia C Al LS ERVERAND V O I PG WG PRSR 0 0 UMTS R4 NGNM SCR 9 9 Wit HA Al 2 S Witch GM Ultimedia C Al LS ERVERAND V o I PG WG PRSR 0 0M SCR 9 9M ultimedi aC all S erve rG PRSR 9 9UMTS R3 / R4UMTS R3M SCR 9 9G PRSR 9 9The Role of Softswitch in3G Mobile NetworkGfGiIuGi MrGiMsGiR UuMGWGnGcTE MT UTRANGrSGSN GGSNEIRMGCFR-SGW *) MRFMultimediaIP NetworksPSTN / Legacy / ExternalApplications & Services *) MMMWORGACY MobileSignallingNetworkMccxalternativeAccessNetworkMhcscfcscfmgt-SGW *) T-SGW *) HSS *) HSS *) Applications &
Services *) MSC server GMSC serverMc McD CSCPCAPMGWNbNcIuIuR-SGW *) MhCAPCAPR UmTE MTBSS / GERANGbAIuREF: 3G TR 23.281 v1.0.1 (2000-07) CS DomainIP MultimediaDomainPS Domain CSCFMGCFSIPH om ee nvironmen tI u P SU TRAN (A ccess) I nterne tP LM NP STN / ISD NI U C SATM / IPP ACKE TB ACKBON EATMM GCCSCF (MMCS) M EDI AG ATEWA YATM / MPLS / IPU MTSM GI MD OMAI N3G R5 CORE NETWORKSS CPHSSVhemMA S3GV MS C3GV MS CS GSNGGS NR NC 3. To NGN Network evolution 1. The driving force evolved to the NGN network • Communication networks from circuit exchange to the next generation of network evolutions with soft exchanged, but how to solve the seamless integration of existing networks for operators and vendors. The sum slip evolution is the first problem. • The structure of the NGN network is not only conducive to the fusion of voice and data, but also contributes to the fusion of optical transmission and packet technology, and the fusion of fixed networks and mobile networks. • The main driving force to evolving to NGN network is that when the data service has become the main source of income, it is inevitable to data-based packet network, but because voice is still an important business, this requires The next generation network must provide the corresponding QoS guarantee according to the requirements of different business. • The second driving force evolved to NGN networks is the user's demand for various types of advanced business and applications, especially for multimedia services, from operators' point of view, providing users wide, easy to use The business can get more benefits to protect user competitiveness, so NGN is a business-driven network. • The third driving force evolved to the NGN network is that the telecommunications market is actually intended to promote the old operators to start checking their business model, and new operators find more profitable business opportunities, so NGN networks must support various operations. Mode provides the most efficient and lowest solution for each mode. • The problem of old operators usually consider how to transition their traditional voice networks to new network structures mainly based on data or IP traffic, while using the benefits of using NGN networks, reducing network transition as much as possible Fees, more advanced, overlapping transition strategies, gradually enhances the ability of existing networks, so they are usually starting from long-distance / mount networks, and then entering the terminals and access. • The new operator establishes NGN networks at the beginning, so as soon as possible to enter the telecommunications market full of competition, it usually begins with the terminal. Different operational strategies mean different priorities, but it is ultimately providing a complete end-to-end solution to complete the transition from the circuit switched network to the packetization network. 2. Softswate is modified and evolved on existing networks • The most essential difference between softswitch systems and traditional switching systems is to separate media access, call control and application service, combine traditional voice networks and new packets. Data networks, as well as open business development environments, which determines softswitch to transform and evolve existing networks. 1). Exchange Long-distance / MRT Network NGN Solutions • Softswate Long-distance / MRS Network Solutions can meet the needs of operators replace the traditional long-distance / bus exchange switch to establish a NGN overlapping network to deal with their backbone online growing voice service And multimedia business needs, can provide long-distance / convergence and international gateway functions for next-generation networks, allowing telecom operators to provide telecommunications foundation and value-added services using advanced packet technology.
• The solution has brought by operators: increasing the utilization of network resources, increasing business revenue, optimizing existing network architecture by increasing or bundling data services, and optimizing existing network architectures, and promoting existing networks to transition to the next generation.图 软 交 长 长 / / 用户 5• 解• 解• 端• 端• 端• 端• 解• 端• 端• 解• 解• 解• 端• 端• 解• 端• 端• The Bureau can meet the needs of operators replace the traditional circuit switch, or it allows operators to establish a NGN overlap network to handle a large number of users in their service area (such as new business districts), or It is said that it allows operators to build an intervaver IP telephone network. • A soft switching system can be deployed on the edge of a large network, or as a central device to be deployed at the center of a small network. • Unlike the circuit switch, the soft switching device can serve various intelligent terminals, such as H.323 terminal, H.248 terminal, MGCP terminal, SIP terminal, 3G multimedia terminal, and the like. Relay gateway Various intelligent terminal E1 Various access gateway IP / ATMIP control Softswate SS7CLASS-4PSTN SS7-ISUP • Terminal NGN solution has the following basic characteristics ¶ Take advantage of the data network to provide a variety of access Method; • From the perspective of business exchange, eliminate hierarchies, all media flows are direct, non-rotated end-to-end communication; ¸ All access devices are in the same level, constitute a large-capacity multimedia multi-service exchange platform; ¹ In order to make a smooth transition, it is important to support the traditional business and the support of the traditional business and new value-added services.
IADAccessservicesManagementGPRS, UMTSresidential, SMENTU sohoOFCNNRPFSPFAPFIAD Integrated Access DeviceAN Access NodeCNN Core Network NodeENN Edge Network NodeNTU Network Termination UnitOTN Optical Transport NetworkRPF Resources Control Plat-formSPF Services Control Plat-formAPF Access to the services Plat formServicesManagementResourcesManagementAccessEdge / CoreNetwork resourceslogical linksxDSL, OFANRPFENNInternetIAP / ISPBorder NodeLocal NGN Core NGN3. 3. Access network to the next generation network evolution access network to the next generation network evolution Packet PacketNetwork NetworkDB Server OS ClientsoftSwitchTgoltonuv5.2 H.248 V5UA Access Network OLT Access Network H.248onu phase 1: Sofswitch and TG Completion of the transformation of the original end bureau switch, TG provides standard V5.1 / v5.2 interface, existing access network can directly access NGN, protect operators' investment stage 2: OLT / ONU gradually evolved into AG, provide provided H.248 Interface, Access a variety of services 4. Equality access • Three long-distance networks 1) Traditional telephone network 2) IP telephone network 3) NGN network • Consider the factor 1) TEL policy 2) Network QoS Requirements • Network Selection • User Selection • Network Selection Ways 1) PSTN User - Preferred Traditional Long Distance Network, NGN Randid - a certain proportion of traffic sharing 2) NGN user -NGN coverage, through NGN-unclosed areas, passed the call side TG , Through traditional long-distance network • User selection method 1) PSTN users - Traditional long-distance network of the same operator - NGN-Other operators of the same operator 2) NGN users -NGN network - Traditional long-distance network of the same operator - Other operators Traditional long-distance network 3) H323 users - Select H323 IP telephone network, do not choose NGN 4. NGN and other network interconnects • As a network evolution plan, NGN It must be considered that there is an existing investment, implementing interoperability with existing networks, thus ensuring the smoothing of the network. • Since the NGN network is used as a hierarchical network structure of signaling and carrying separation, different functional entities need to achieve interoperability of signaling and media, respectively. • The interoperability of the media is mainly the problem that needs to be considered when interoperable with the circuit switched network. 1. Interoperability between softswitch networks • Softswitch is the core device of the next generation network, and each operator is in the NGN network that is built into the core, its network architecture may vary, but at least logically Divided into two levels: operators' internal softswitch network level and soft exchange intercommunication with other operators. • Softswitch network represents the softswitch network within the operator, responsible for providing call control, address resolution, user authentication, business, and other functions for users within the operator.
Soft exchange interworking point softswitch network MG SIP terminal H.248 terminal MGCP terminal and other operators Interworking and operators in non-soft exchange network interoperability 2 NGN and H.323 network interoperability network framework • Based on H.323 protocol The IP telephone network has covered our main provinces and cities in China, and therefore, when forming a soft exchange as a core, the IP telephone is considering the interconnection of the existing H.323 network. • The H.323 protocol is recommended. • Be soft When the exchange network is in different operators, the exchange network is set between different operators, and the interworking point is between the soft exchange intervening points and the top-level gatekeeper; • When the softswitch network is in the same operator in the network, the interoperability is operated by each operation. The business is determined based on the actual situation of network construction. Top gatekeeper first-level gatekeeper secondary gatekeeper 1st gateway MGCH.323 terminal H.323 gateway MG soft switching network H.323 network soft switching network MG SIP terminal H.248 terminal MGCP terminal MG SIP terminal H.248 terminal MGCP terminal soft exchange interworking point softswun network soft exchange interworking point softswitch network 1) gateway directly route network mode l Softswate needs to perform address resolution to the gatekeeper via H.225 RAS message, interact with H.323 gateway Q. 931 Signaling and media negotiation through H.245, if the soft exchange is combined with the media gateway it controls, it seems to be equivalent to a virtual H.323 gateway on the H.323 side. l Media gateway, soft exchange, and H.323 gatekeeper, the address of the H.323 gateway has become an open information MG soft exchange H.323 gateway gateway RASQ.931 / H.245RTTPRAS2) Preto mode L soft exchange and H. 323 Networks There is no signaling interaction, soft exchange through signaling gateway and relay gateway interact with the front machine, and realizes interworking with the H.323 network through the front machine, which is essentially interoperability with the PSTN network. l The front machine can serve as the role of the gateway, to ensure the relative independence of the network. The operator can block the interior network topology to the outside world. Mg Softswitch H.323 Gateway Net Stand RAS Pre-Machine Letter Letter 3) Inheritance Method for IP Phone (H.323) Business When NGN users have long-distance calls through IP phones: • When NGN users are initiated An IP telephone call, is controlled by SS, through SS communication between NGN users, and obtains the IP address of the NGN user, and obtains the IP address of the destination H.323 GW. Under the control of SS, the origin is completed The transmission of the voice media stream of AG and the destination H.323 GW. This situation requires SS and AG to support the H.323 protocol. • When the NGN user initiates an IP phone call, the SS is controlled to the traditional telephone network, and the connection of the NGN user IP phone is completed in a conventional manner. AG H.323GWSS Beijing LS01012345678179XX 1 account password 01012345678H.323GK H.323GKH.323GWLS (1) (2) 3 NGN and PSTN / ISDN Interoperable network frame (1) Soft switch is located in the terminal / metro network Intercommunication frame structure SIP / H.248 / MGCP terminal integrated access media gateway relay gateway PSTN / ISDN IP / ATM network soft exchange network circuit switched network soft exchange (2) Soft cross-switching interworking bureau or long-distance network Soft Soft Switching relay gateway relay gateway PSTN / ISDN Local network IP / ATM network PSTN / ISDN local network circuit switched local network soft exchange network circuit switched local network 4. NGN and SS7 signaling network interoperant • When NGN interconnects through the signaling gateway, the signaling gateway has two networking methods: proxy signaling point mode and signaling transfer point networking mode.
• In the proxy signaling point mode, the signaling gateway share a signaling point code with the soft exchange, jointly provides a complete signaling point function, the signaling adaptation protocol is M3UA; • Signaling transfer point network mode, letter Let the network have its own independent signaling point encoding, provide a complete signaling transfer point function, signaling transfer point networking can be implemented in two adapter protocols: M2PA and M3UA, M2PA mode, soft exchange The MTP3 function is included in the M3UA mode, and the MTP3 function is not included in the softswitch. 5. Interoperability with the interactive network of the smart network with the interoperability of the existing intelligent network through the signaling gateway; l In order to interoperate with the smart network, the soft exchange must have the SSF function of the smart network, in the intelligent network side, soft exchange is quite In one SSP. SS7 Network SCP Media Gateway SSF / Softswate SGPSTN / ISDN6. When interworking with the SIP network system is interoperable with the SIP network, the soft exchange must be able to implement mapping or conversion between circuit signaling between the PSTN / ISDN side and SIP-T signaling, and soft exchange must also have SIP user agent functions It is mainly to emit SIP call requests to the IP side on behalf of the PSTN / ISDN side and respond to the SIP call from the IP side. l The interoperability of soft exchange and SIP network is divided into the following two cases: call self-swelled switched sides, ending in the SIP network, and calling from the SIP network, ending in a softswitch network. l In the first case, the soft switching network should be able to analyze the IP address of the called corresponding SIP server according to the called E.164 number or Sipuri, and then send a call request to this server, and the SIP server transmits the message to SIP. Terminal; L second case, the SIP server should be able to parse the corresponding soft exchange according to the called E.164 number, and then send the call request to a soft exchange. Mg Soft Switch SIP Terminal SIP Server RTPSIPSIP7. Interoperability with Mobile Network (1) Soft Switch As the Interoperable Framework Structure of the Terminal and Long Distance Network • In the mobile local network, soft exchange can be located in the terminal, through the media access gateway and wireless The function entity of the access subsystem is connected. • MSC Server cooperates with the user media gateway and relay media gateway to complete the user terminal. Wireless access network MGW MGWMSC ServerHLR / AUC send / terminal long-distance bureaus bearing signaling local network long-distance circuit network signaling gateway STP (2) Mobile Softswitch As interoperability between long distance and local mobile network • In this way, mobile soft The interconnected network interconnection is the same as the fixed network. 5. Domestic and foreign experiments • Currently, major foreign operators, including BELL ATLANTIC, Level3, British Telecom BT, United Kingdom, the United States, etc., have expanded NGN tests, and achieved phased outcomes varying degrees. For the next generation of network technology, business, operations as early as possible. • China Telecom, China Netcom, China Railcom, China Unicom, China Guangwei, etc. have carried out NGN (soft exchange) test work, and in general, NGN is still in the test stage, but because of the rapid development of various technologies, NGN Construction will start and gradually commercially in the future 2-3 years, and evolution from existing networks to NGN will be a long-term process. • In the field of soft exchange, domestic manufacturers have truly flatly sitting with foreign manufacturers with their own strength. Domestic soft exchange experiments • Participation in China Telecom test has ZTE, Alcatel, North Electric, Ericsson, BISC • Participate in Netcom Holdings: ZTE, Cisco, UT Starka. • Participate in China Unicom test: Huawei, ZTE, Lucent, Alcatel, Bisc, North Electric, Ericsson, etc. • The manufacturer of China Tietong Company has Huawei, ZTE, Nortel, etc. • Participation in Guangwei soft exchange test has Huawei, ZTE, Alcatell, Bisc, etc.
• China Netcom: Actively prepared • China Mobile: Actively prepare for the sixth. Recognition for NGN / soft exchange development 1. Why NGN / Softswate 1) NGN drive network fusion 2) Technology gradually matured 3) More Features, More in operation space, more flexible 4) More easily develop collective user multimedia integrated communication capabilities 5) NGN implementation can be a variety of diverse, and gradually 6) use softswitch networking in line with future development, group Producing stock market new image can be pre-paid in advance, winning competitive advantage 2. Currently, the challenge of soft exchange 1) Economic issues have low-exchange price less than switches 2) Business model • Foreign: Business operation • Domestic: By price And business volume stimulating traffic • Maintenance, accounting, management system due to larger policy 4) Network structure, security, IP address, etc. 5) Business innovation should be the key content of NGN 3. Technical issues in NGN / soft exchange 1) NGN bearer ATM? IP? ATM AAL1 / AAL2 / AAL5 PVC / SVCIP QoS2) Networking problem Softswitch is a new technology, from signaling system to architecture, it needs to be gradually improved and mature, and there is currently no large network. And operational experience, is still only in the starting phase. After long-term operation accumulation, traditional telecommunications networks has been very mature experience in network organizations; while soft exchange-based online organizations currently have no success or fail experience at home and abroad, is a full-plane structure based on soft exchange, or The partition domain selection structure has to be further explored in terms of technology and practice. 3) How does the network reliability problem guarantee? Double owner? 4) A large amount of intelligent terminal / IAD is expensive, identification and authentication, user troubleshooting? 5) Multi-Agreement Interoperability Agreement has not been compatible, and the standard is still in development. Softswate of different manufacturers is difficult to make compatible in terms of the use of technical standards and the compatibility of the agreement. BICC protocol, SIP-T protocol, and H.248 protocol, SIP protocol, H323 protocol, MGCP protocol, etc. are also developed, and the options for the agreement require operators to further determine the needs of the business. 6) Many of the business of softswitch systems are still implemented in softswitch, which has a distance from the softswitch system business and call control separation, how to truly implement the opening of the business, how to cooperate with the application server, open The business development capabilities of the API interface are worth our research and exploration. 7) QoS has no final solution. 8) A great advantage of NGN is that business and network distribution are not related to each other, but the media gateway and soft exchange network allocation relationship should be closely related to Soft Switch and Media Gateway, for integrated network management between different manufacturers. It is to be further explored. 9) Softswitch system network management capacity is limited, can not meet the management capabilities as PSTN networks, SDH nets, cannot monitor network status, especially difficult to manage IP smart user terminal devices, after users fail, user testing, troubleshooting, and failure Positioning and other functions have to be achieved, not conducive to the application of large-scale networks. 10) There are also problems such as inter-technical and policy sectors such as IP address, number resources, network security, and networks.
