With the scale of 3G services at home and abroad, the mobile service has developed rapidly from traditional narrowband voice to broadband data and mobile video. It is predicted that the wireless broadband traffic CAGR will exceed 100% in the next five years. At present, China Mobile has deployed IP mobile backhaul networks on a large scale. China Telecom and China Unicom have also started pilot projects in various places. At the same time, overseas leading operators Vodafone, BT, Japan KDDI, and US SPRINT are also actively building IP mobile backhaul networks. The construction boom of a global IP mobile backhaul network has begun.
In the high-speed construction of the IP mobile backhaul network, operators are facing a new problem, that is, after the network IP, how to ensure that the quality of maintenance is not reduced, OPEX does not increase significantly. Therefore, Wei Leping, director of the China Telecom Science and Technology Committee, once lamented: "The key to commercialization of mobile backhaul network IP is two points. One is cost, the other is operation and maintenance!"
Operation and maintenance challenges brought by mobile backhaul IP. High network deployment cost and long network open periodThe traditional router equipment is divided into two parts: hardware installation and software commissioning. If you have to pit two times in the face of tens of thousands of box-type equipment, the cost will be very high. According to the calculation, the cost of a single pit stop is 500Â¥/time in China and 300$/time in overseas. Network planning and design is more complicated after network IP, involving bandwidth reuse, QoS guarantee, reliability, security design and so on.
Business opening skills requirements are increased, adjustments are more complicatedAfter the network equipment is IP-based, the MPLS technology used in the bearer involves a large number of parameters (estimated to be more than five times that of SDH). The manpower required to open the same number of base stations and services is at least 4-5 times more. At the same time, the wireless base station often needs network optimization, usually involving the adjustment of the affiliation between hundreds of node Bs and the RNC. Therefore, the synchronization adjustment of the IP backhaul network will be very complicated, due to numerous parameters, high error rate, and time consuming force.
IP network is a cloud, lack of effective means of fault locationThe IP network is dynamic, and the network itself has superior self-healing capabilities. Therefore, when a business problem occurs, it is difficult for maintenance personnel to quickly determine where the problem is. Especially the problem of quality degradation, usually there is no warning, but the packet loss or delay is large. If the problem occurs, it can only be handled by the maintenance expert (CCIE) with many years. For thousands of routing devices in IP mobile backhaul networks, it is impossible to rely on the experience of a few experts. It is urgent to have simple and effective fault location methods.
Research on Operation and Maintenance Plan of Mobile Backhaul Network in SDH EraDeployment: After the device is powered on, the optical path is connected. The SDH network can remotely discover the device through the ECC in-band management channel, and implement the commissioning and debugging in the network management center to implement the hardware personnel to enter the station once.
Service provisioning: The network data is statically configured. The E2E pipeline service based on the network management is distributed, and an average base station service is opened within 10 minutes. Realize efficient operation of the business based on mouse click operation;
Troubleshooting: SDH has rich OAM overhead, AIS/RDI/REI indication information, and auxiliary loop detection, which can quickly isolate and delimit faults. The implementation of personnel skills is low and the positioning is simple.
By contrast, if based on the traditional IP network maintenance method, then we can see that after the mobile backhaul network IP, the operator's operation and maintenance efficiency will be greatly reduced, about 50% lower. The mobile backhaul IP is already an inevitable trend. How do we deal with this problem and how to improve the maintenance efficiency of the IP network?
IP operation and maintenance of the whole life cycle is the solutionThe operation and maintenance is divided into five major stages, and the five stages of planning and design – opening deployment – ​​business opening – network security – evaluation and optimization, etc., run through the entire operation and maintenance life cycle. The following is an analysis of the operator's expectations for the five major operations:
In view of the operation and maintenance of the IP mobile backhaul network, we have carried out in-depth systematic research in each operation and maintenance stage in combination with the actual situation of multiple domestic/overseas operators, and formed an effective methodology and support means. details as follows:
Planning and design: tooling, supporting mobile backhaul networks is more efficient and reliableIn the network planning and design stage, through effective planning and design tools, it can support the planning and design of scenarios such as new network construction and capacity expansion. Through planning and design tools, the network can be planned according to the business needs and development trends of the operators, and network protocols, clocks, and reliability are designed for different levels of devices. For the expansion scenario, the planning tool can support the export of the inventory network data from the existing network management system to achieve incremental design. After the design is completed, the network equipment planning table for guiding subsequent commissioning and debugging is output. The network design efficiency can reach 200 sets/person day, and the networking of 1000 sets of equipment can complete the design work in 5 working days.
Deployment: Automation, mass-factory plug-and-play, remote commissioning, no-incomingImport the network device planning table output from the design phase into the professional network management system. You can generate corresponding configuration scripts according to different scenarios, without manually compiling the command line. After the hardware is powered on by the engineer at the site, the U2000 is connected to the device to assign an IP address to the device to implement automatic discovery of the device. Then, the corresponding configuration file in the U2000 is directly sent to the corresponding device. Plug and play, to achieve soft-tuning free entry. Based on this method, soft-tuning efficiency similar to SDH can be achieved, 20 units/person day. (Note: Actual measurement data for a carrier project in Thailand)
Business opening: Visualization, web management GUI click visual release inherits SDH like experienceAfter the network infrastructure is deployed, the 2G/3G/LTE base station needs to be opened. The network bearer model is designed for 2G TDM base stations and 3G/LTE ATM/Ethernet base stations through network management, based on three levels: device nodes, network pipes, and service pipes. Refer to the SDH management idea to realize the service opening of the mouse click visualization. The opening of one 3G base station service can be controlled within 15 minutes. At the same time, for a typical backhaul scenario, a flexible service template customization function is provided to meet the service provisioning requirements of various complex network scenarios.
Network security: visualization, centralization, intelligence, reducing personnel skillsFor the dynamic nature of IP networks, traditional command line-based maintenance leads to an IP network that is a cloud. It is not clear how the cloud is going. Based on the IP network management, the network connection can be displayed on four layers (physical level, clock level, network level, and service level) at a rapid level, so that the daily maintenance of the operator can be seen at a glance;
For the IP network soft pipe, whether the wireless quality is up to standard, how to effectively measure the network operation, and provide a centralized monitoring platform for network bearer quality and bearer capability, based on this platform, operators can effectively understand the operation of all levels of the bearer network. Situation, based on real-time monitoring of base station service quality, network performance is degraded, timely warning can be timely, and it is quickly identified which base station needs priority attention and processing;
When the network is faulty, the E2E service forwarding path of the NodeB and the RNC is visualized through the IP network management. When the service is faulty, a variety of intelligent troubleshooting methods are encapsulated based on the path, which can quickly locate which layer and which hop. If there is a problem, you can effectively get rid of the operator's dependence on the traditional command line positioning.
Network optimization: specialization, expert experience + professional tools, support network optimization
After discovering that network quality has deteriorated for a long time, professional equipment vendors are required to provide more professional evaluation and optimization services. Network tools and performance data are collected regularly through professional tools, and problems in terms of capacity, quality, reliability, etc. are analyzed, and optimization suggestions are given. To help operators adjust the network to the optimal.
to sum upMobile backhaul IP, the entire life cycle IP operation and maintenance solution is the key. Only manufacturers with many years of successful network operation and maintenance experience in the field of transmission, data and integrated access can fully grasp the operators' network operation and maintenance demands and build a truly deployable IP operation and maintenance solution to help operations. Commercial IP mobile backhaul network scale commercial.
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