1、 附录 附录 A 外文翻译 -原文部分 Towards Management of Next Generation Networks Mi-Jung Choi and James Won-Ki Hong Dept.of Computer Science and Engineering, POSTECH, Korea Summary Next Generation Network(NGN) is envisioned to be an inter-working environment of heterogeneous networks of wired and wireless access
2、networks, PSTN, satellites, broadcasting, etc., all interconnected through the service providers IP backbone and the Internet. NGN uses multiple broadband, QoS-enabled transport technologies and service-related functions independent from underlying transport-related technologies. The operations and
3、management of such interconnected networks are expected to be much more difficult and important than the traditional network environment. In this paper, we present an overview of the current status towards the management of NGN and discuss challenges in operating and managing NGN. We also present th
4、e operations and management requirements of NGN in accordance with the challenges. We then present standardization activities of NGN management and some of the notable research and development efforts related to NGN management. Key words: NGN, BcN, NGN Management 1.Introduction NGN is envisioned to
5、be an answer to network operators and service providers to replace existing telephone networks as well as to introduce a new converged service platform between fixed and mobile telecommunication businesses1.It is generally agreed that the main difference between traditional telecommunication network
6、s and NGN is the shift from separate and vertically integrated application-specific networks to a single network capable of carrying any services. NGN is essentially about delivering new services that are available to any place,at any time,on any device,through any customer-chosen access mechanism.
7、NGN is expected to co-exist and inter-work among wired networks(e.g., xDSL, Metro Ethernet, FTTH, leased lines, ISDN),wireless networks(e.g.,2G,3G,WLAN,WiMAX/WiBro) as well as satellites and broadcasting networks, all interconnected through the service providers IP backbone networks and the Internet
8、. In this heterogeneous networking environment, in addition to the traditional challenges such as security,QoS,and charging,new challenges such as generalized mobility,and network discovery and selection exist.Providing effective,secure and efficient operations and management of the envisioned NGN e
9、nvironment is a huge challenge. In order to provide the creation,deployment,and management of all kinds of services,NGN operations are highly dependant on flexible and efficient management systems and processes2.When the networks are evolving towards NGN,the scenario to support various services woul
10、d become more complex.The carrying of diverse traffic such as voice,data,video or signaling would be possibly integrated onto one common platform, which would call for the corresponding network management systems. The ITU-T Recommendation Y.24015presents the management requirements,general principle
11、s and architectural requirements for managing NGN to support business processes to plan,provision,install,maintain, operate and administer NGN resources and services4. This paper presents a brief overview of NGN by giving its definition and functional architecture viewed by ITU-T.BcN(Broadband Conve
12、rgence Network)is an NGN equivalent terminology that has been used in Korea over the past several years.We also present a brief overview and status of BcN activities in Korea.Compared to managing the traditional telecommunication networks,managing the NGN is much more difficult and complex.Thus,we e
13、xamine the challenges facing the management of NGN.The standards and research activities of NGN management are also presented.The remainder of this paper is organized as follows.Section 2 gives an overview of NGN based on the standardization activities of ITU-T.We also provide a brief overview of Bc
14、N in Korea.Section 3 presents the challenges in managing NGN.Section 4 presents the operations and management requirements of NGN as well as some of the notable research and development activities on NGN management.Finally,we end the paper with concluding remarks in Section 5. 2.Overview of NGN In t
15、his section,we present the definition of Next Generation Network(NGN)along with its architecture and principles3.We also examine the development and deployment effort of BcN in Korea. 2.1 Definition of NGN NGN is a packet-based network to support the transfer of mixed traffic types such as voice,vid
16、eo,and data1.It is expected to integrate services offered by traditional networks and new innovative IP services into a single service platform.The key foundation of the NGN is the separation of services and transport networks,which provides QoS-enabled transport technologies and service-related fun
17、ctions independent from underlying transport technologies36.The transport functions provide transfer of information between peer entities；the services functions are concerned with the applications and services to be operated between peer entities37. Fig.1 NGN Network Components Fig.1 shows typical N
18、GN components:service network,core network,access network,and userequipment37.The service network is composed of various servers such as Web Server,Authentication,Authorization and Accounting(AAA),SIP Proxy Server and LDAP Server,etc.The service network is only responsible for providing services and
19、 applications for NGN users.The connection between the service network and the core network can be implemented via gateways.The core network in NGN represents the transportation backbone in traditional networks,which is concerned with the transfer of information between peer entities.Besides the tra
20、nsfer of packets,control and management functions are also implemented in the core network.The access network in NGN is derived from the existing access technologies.To accommodate various access media,the access network is separated from the core network of NGN,which serves as an intermediate betwe
21、en user equipments and core network. 2.2 NGN Functional Architecture Fig.2 shows an overview of the NGN functional architecture2.The NGN architecture needs to offer the configuration flexibility to support multiple access technologies.It also needs to support a distributed and open control mechanism,which provides a separated service provisioning from transport network operation and speeds up the provision of diversified NGN services.
