The key to integration of PTN and TD maintenance under FTTH trend

During the PTN network period, the integration of the transmission side and the wireless side must be put on the agenda. First of all, the core technology of the PTN network is packet switching. The "elastic pipeline" feature makes the technology have the advantages of statistical multiplexing, greatly improving the resource utilization of the network, and also how to analyze the network traffic without affecting the transmission. In the case of the network structure, problems such as emergency communication support are realized. Secondly, the technology deploys a powerful HQoS (Hierarchical Quality of Service) function. Different types of services must be configured with different QoS attributes. How to properly formulate the service QoS policy to achieve the quality of service required by the wireless side will also change. Very urgent. In addition, the PTN transmission fault circuit becomes more complicated and recessive than the SDH circuit, and the cause of packet loss caused by network congestion. The above three points require that the transmission side must abandon the maintenance concept and working method that are backward in the traditional SDH network period, strengthen the communication with the wireless, and timely understand the attributes of the wireless side service (including traffic, QoS, etc.), so as to fully utilize the PTN technology. The advantages.

Implement joint deployment on QoS policies

Quality of Service (QoS) refers to the ability of a network to provide the services it needs for a specific service on a network that spans multiple underlying network technologies (MP, FR, ATM, Ethernet, SDH, MPLS, etc.). Achievable service levels in terms of packet rate, latency, jitter and bandwidth. The PTN device has powerful HQoS (hierarchical QoS) function. It can deploy QoS policies of UNI, V-UNI, PW, Tunnel, and NNU to achieve CS7, CS6, EF, AF4, AF3, AF2, AF1, and BE. Seven different service service levels fully meet the service level requirements of different types of services in a full-service scenario.

With the deepening of China Mobile's full-service 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, video telephony and other services will also become part of the company's revenue. Services with different service levels have different requirements for the transmission network (such as bandwidth, delay, etc.).

In the past, the SDH/MSTP network was a "hard pipe". Regardless of whether it carries the actual service, it will also occupy the resources of the transmission network, and the utilization of network resources is not high. SDH/MSTP technology is a technology that meets specific needs in 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 service, it will not occupy the transmission resources, which greatly enhances the flexibility of the network and maximizes the utilization of transmission resources. . Therefore, for all kinds of wireless services with different quality of service requirements, if it is still expected that all services will receive the same quality transmission on the transmission network as in the past, it will no longer be reasonable. The transmission side and the radio side should reach a consensus on the QoS policy (as shown in Table 1), so that wireless services with different quality of service requirements can obtain a more economical transmission in the transmission network.

Synchronous switching of LAG protection between PTN-RNC

The LAG (Link Aggregation Group) protection between the Huawei PTN3900 and the Huawei DRNC820 has a problem of switching unsynchronization. If the PTN device receives -35db, the device reports an ETH-LOS alarm (may be debounced, but does not affect the switching), but the code stream sent by both parties is still normal. At this time, the PTN side has been switched, but the peer RNC has no In response, no swapping occurred. The asynchronous switching of the LAG protection will cause all the sites carried by the RNC port to be retired, and the impact surface is large. In response to the above faults, the transmission side and the wireless side need to strengthen communication and jointly develop a solution.

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