Method and system for maintaining network link clock

Abstract

The invention discloses a method and a system for maintaining a network link clock. The method comprises the following steps that: when a link in a normal link state exists in a link between a first neighboring base station node of a base station node and the base station node, the base station node informs a second neighboring base station node of taking a clock source of the base station node as a reference clock source; and when a link in a normal link state does not exist in the link between the first neighboring base station node of the base station node and the base station node, the base station node informs the second neighboring base station node of taking a clock source of the other base station node except the base station node in two neighboring base station nodes of the second neighboring base station node as the reference clock source. When a link network is switched among a ring link network, a cascade link network and a point-to-point link network according to the on-off connection type of the link, the clock accuracy of each base station node is still maintained and the self-healing protective capability of the link network is enhanced.

Description

technical field [0001] The invention relates to a wireless communication network, in particular to a method and system for maintaining network link clocks. Background technique [0002] In the 3G communication field, 2M E1 carriers are used in voice and data communication services. Most operators use dedicated E1 / T1 chips (supporting 2 / 4 / 8 / 16 channels of 2 trillion E1) to realize the above-mentioned communication services. [0003] When transmitting communication in the ring network, one party needs to ensure a stable and unified clock communication source for the entire communication network to ensure the clock synchronization of the E1 lines of the entire communication network. Inconsistent clock sources or interlocking of clock selection at any node of the ring network may cause abnormalities in communication. The phenomenon of clock selection interlocking here means that all communication nodes select the clock of the other party for internal phase-locked loop locking....

AI Technical Summary

Problems solved by technology

Base station A can also extract the clock from base station B. If base station A and B extract the clock of the other party at the same time, the extracted clocks will be interlocked; and so on, B, C, and D are mutually exclusive Interlocking phenomenon may occur

[0006] (2) Even if it is guaranteed that there will be no clock interlocking phenomenon in the initial state of the ring network, when a node (such as B) in the ring network is abnormally reset or the version is upgraded, the interlocking situation will still occur

[0007] (3) Other base stations cannot know the link status of two adjacent base stations. When the links of these two base stations are abnormal, only the clock selection of these two links will change accordingly, and the other base stations will remain unchanged.

This will also result in a line clock interlock situation

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