مدیریت بهره برداری شبکه های دسترسی باند پهن IP
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Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)
Journal : Computer Communications, Volume 26, Issue 7, 1 May 2003, Pages 679–690
The last several years have seen significant advances in broadband access technology, including greater bandwidth, improved quality of service capabilities, multicast, and better applications availability. Customers today have several choices of broadband access technologies, namely Digital Subscriber Lines (DSL), Cable, wireless, and most recently Ethernet or Fiber to the home or business, as the first/last mile access is now an emerging technology gaining significant momentum specially Europe and Asia Pacific. Ensuring profitability from these services requires a comprehensive service management architecture that enables service providers to carefully plan, quickly provision, efficiently operate, and accurately bill these services. Once the user is connected to the network, service providers must monitor and ensure the Quality of Service. In this paper, we first provide an overview several IP broadband access technologies including Ethernet to the home/business, IP DSL, Wireless, and Cable. We then define an integrated Operation Support Systems/Network Management Systems (OSS/NMS) architecture including description of fault, configuration, accounting, performance, and security management functions. Several traffic-engineering algorithms are then discussed and simulation results are compared. Finally, an intelligent capacity allocation algorithm for IP network is introduced.
The Internet is penetrating all aspects of society and becoming an indispensable part of our daily lives. With the enabling applications such as emails, the WWW, online shopping, banking, video-conferencing, distant learning, entertainment, which often entail exchange of large amount of data, the Internet access speed is an important issue. Internet access is in fact becoming a commodity service from a service provider perspective. It has little customer loyalty and is driven by price and quality. There are many broadband access technologies including Ethernet-to-the-Home (ETTH) and Ethernet-to-the-Business (ETTB) (collectively known as ETTx), wireless, cable, and IP digital subscriber line (DSL). Ethernet is the dominant technology in LAN due to its simplicity, low cost, ubiquity (300 million ports installed worldwide), and very high speeds. In the last four years the industry has seen a jump from shared 10 Mbps, to switched 100 Mbps, to switched 1 Gbps, and now up to switched 10 Gbps Ethernet. These factors have allowed LAN network managers to put more and more mission critical applications on their networks. In the WAN, service providers have used technologies such as DWDM to scale the long-haul networks. This has enabled service providers to more cost-effective by utilizing their investment in fiber. By extending Ethernet to the last mile, service providers can deliver true multi-services to the end-users. ETTx offers new opportunities for service providers. However, it entails laying fibers to the customer premises, which may be expensive. Wireless provides mobile connection to the Internet and voice networks. Due to the noisy transmission media, it can support up to 2 Mbps in the optimal case, for the 3G (third generation) wireless systems, such as IMT-2000 and CDMA2000.3x. In practical environment, the actual speed can be much slower. However, the ubiquitous access capability has gained much market interest. Cable access can provide connection speed up to 6 Mbps. With cable connections to most of the household in North America, it gives the cable operators quick presence into the Internet access market. The lack of switching capability in the cable network limits its two-way communications capability. Significant infrastructure upgrade is needed. DSL uses the current twisted copper pairs in the Plain Old Telephone Service (POTS) to provide Internet access. There are many flavors of DSL technology, e.g. Asymmetric ADSL (ADSL), G.Lite, Very-high-data-rate DSL (VDSL), etc. The downstream bit rate ranges from 1 Mbps by G.Lite to up to 52 Mbps by VDSL. The actual speed depends on the specific implementation and the distance between the customer premise and the central office (CO), i.e. the loop length. The almost 100% market penetration of the twisted pairs make DSL is strong contender in providing Internet access. Possessing the access technology is only half of the battle for service providers. The ability to manage the network efficiently and in a timely fashion is essential in the current competitive market place. Network management can be defined as the set of operation support systems that service providers use to deploy, configure, maintain, and monitor the network and the services that are carried over it. They can also be used to study the network behavior and determine the future network expansion plans. Network management is also used for user authentication and network security to protect the network from malicious users and to maintain the network integrity. Other important issues include service order management, billing, to name a few. These are all crucial for the service providers' market penetration and profitability. The objective of this paper is to discuss the integrated management of IP (Internet Protocol) broadband access networks. This paper is organized as follows. In Section 2, we will give an overview of the few popular broadband access technologies. The integrated network management problem is discussed in Section 3. Section 4 studies the traffic modeling and network-dimensioning problem, which is an essential component in network management. An intelligent capacity allocation algorithm is proposed. Conclusion remarks are given in Section 5.
نتیجه گیری انگلیسی
This paper described architectures and OSS/NMS for IP-based broadband networks including ETTx, wireless, IP DSL, and cable. The OSS/NMS functions included fault management, configuration management, accounting management, performance management, and security management. Traffic engineering algorithms and models to simulate different types of IP traffic are then introduced. The simulation model accepts a multiplexed traffic stream of these sources as input and computes the needed equivalent capacity to achieve specific QoS objectives. Results of the model show that the multiplexed traffic patterns provide results as predicted. Finally, the paper described a self-adaptive Intelligent Capacity Allocation algorithm. Further research is still required to define each function of the capacity allocation algorithm.