Method for providing clock for base station losing external clock signal source

Abstract

The invention discloses a method for providing a clock for a base station losing an external clock signal source, which comprises the following steps: a. the base station sends a GPS synchronous establishment request to an access service gateway after the base station loses an external GPS signal source; b. the access service gateway sends a GPS forward indication message to a forward base station to request a GPS signal; c. the forward base station informs the access service gateway of the GPS signal; and d. the access service gateway sends the GPS signal to the base station. The invention ensures that the synchronization is not damaged forever and the network always provides normal service. A GPS clock and the frequency synchronization can be forwarded by base stations in a forward base station list of other access service gateways even if all the base stations under the access service gateways lose external signal sources. In addition, the invention saves the transmission and processing expenditure caused by forwarding the GPS signal to the maximum extent.

Description

technical field [0001] The invention relates to the technical field of wireless networks, in particular to a method for providing a clock for a base station that loses an external clock signal source in a mobile WiMAX wireless network. Background technique [0002] In the current mobile WiMAX network, each base station must install an independent GPS receiving antenna, and input the GPS signal received by the external GPS antenna to the base station through the GPS signal input port of the base station, so that it can obtain a stable clock source and obtain own accurate location information. Each base station is equipped with a holding oscillator to ensure that it can continue to provide a clock and frequency that can work normally when the external GPS signal source is lost for a short time. [0003] When a base station cannot obtain external GPS signals for a long period of time, the error of the clock generated by the base station oscillator will inevitably become larger...

AI Technical Summary

Problems solved by technology

However, WiMAX is a technology based on an all-IP network. The protocol does not clearly specify how to process TDM signals. Even if the TDM CS layer is added, it can only be terminated at the MAC layer of WiMAX. WiMAX base stations without PSTN uplinks are still can't achieve this way

Second, in the operating cost of the network, the cost of renting traditional TDM backhaul will account for 30% to 50% of the total expenditure

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