During the PTN network period, the integration of maintenance on the transmission side and the wireless side must be put on the agenda. First of all, the core technology of PTN network is packet exchange. The "elastic pipe" feature makes this technology have the advantage of statistical multiplexing, which greatly improves the resource utilization rate of the network. It also brings how to analyze network traffic without affecting transmission. In the case of a network structure, it is difficult to realize emergency communication support. Second, the technology deploys a powerful HQoS (Hierarchical Quality of Service, hierarchical QoS) function. Different types of services must be configured with different QoS attributes. How to reasonably formulate QoS policies for services to achieve the quality of service required by the wireless side will also change Very urgently. In addition, compared with SDH circuits, PTN transmission failure circuits have more complicated and hidden causes of failures such as packet loss caused by network congestion. The above three points require that the transmission side must abandon the traditional maintenance concepts and working methods of the traditional SDH network period, effectively strengthen the communication with the wireless, and timely understand the attributes of the wireless side services (including traffic, QoS and other characteristics), so as to fully utilize the PTN technology The advantages.
Achieve joint deployment on QoS strategy
Quality of service QoS refers to a network's ability to provide services needed for specific services on a network that spans multiple underlying network technologies (MP, FR, ATM, Ethernet, SDH, MPLS, etc.) Obtain predictable service levels in terms of packet rate, delay, jitter, and bandwidth. PTN equipment has a powerful HQoS (Hierarchical QoS) function, and can deploy UNI, V-UNI, PW, Tunnel and NNU five levels of QoS policies to achieve CS7, CS6, EF, AF4, AF3, AF2, AF1 and BE 7 different business service levels fully meet the service level requirements of different types of business in the full business scenario.
With the deepening of China Mobile's overall business strategy, the types of services provided by China Mobile will become more and more abundant in the next few years. In addition to traditional voice services, home Internet services, group data services, and videophone services will also become part of the company's revenue. Services with different service levels have different requirements on the transmission network (such as bandwidth, delay, etc.).
In the past, the SDH / MSTP network was a "hard pipe", regardless of whether it carried actual services or not, it would also occupy the resources of the transmission network, and the utilization rate of the network resources was not high. SDH / MSTP technology is a technology that meets specific needs in the context of a specific era and is also outdated. PTN technology provides a "soft pipe", its biggest advantage is that if the pipe does not carry the actual business, it will not occupy transmission resources, which greatly enhances the flexibility of the network, while maximizing the utilization of transmission resources . Therefore, for all types of wireless services with different service quality requirements, it is no longer reasonable to expect that all services will be transmitted with the same quality on the transmission network as in the past. The transmission side and the wireless side should reach a consensus on the QoS strategy (see Table 1) to achieve that the wireless services with different service quality requirements can meet the requirements and be more economically transmitted in the transmission network.
Realize synchronous switching of LAG protection between PTN-RNC
LAG (Link Aggregation Group) protection between Huawei PTN3900 equipment and Huawei DRNC820 equipment has a switching out of synchronization problem. If the PTN device receives -35db, the device reports the ETH-LOS alarm (it may be debounced, but does not affect the switching), but the code stream sent by both parties is still normal. At this time, switching has occurred on the PTN side, but the peer RNC has no In response, no switching occurred. The unsynchronized switching protected by LAG will cause all the sites carried by the RNC port to retire, which has a great impact. In response to the above-mentioned failures, the transmission side and the wireless side need to strengthen communication and jointly develop solutions.
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