Clock correcting method and system based on IP network for wireless base station
A wireless base station and clock correction technology, which is applied in time division multiplexing systems, wireless communication, communication between multiple stations, etc., can solve the problems of E1 link acquiring clock signal, and the clock accuracy cannot meet the needs of wireless communication equipment. , to achieve the effect of precise clock timing
Inactive Publication Date: 2012-06-06
深圳市恒程汇文化科技有限公司
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Problems solved by technology
For IP networking, the clock signal cannot be obtained through the E1 link, and the clock accuracy obtained simply through the physical layer of the IP network cannot meet the requirements of wireless communication equipment
Method used
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[0026] Hereinafter, the present invention will be described in detail with reference to the drawings and specific embodiments.
[0027] figure 1 The system structure of the present invention is exemplarily described. figure 1 Only the parts related to the present invention are described. Those skilled in the art can understand that the wireless base station has other functions and structures, but these are not within the scope of the present invention. figure 1 The exemplary system shown includes a wireless base station 1 and a clock synchronization server 2. The wireless base station 1 includes a local clock 11, a correction data acquisition module 12, and a clock correction module 13.
[0028] in figure 1 Here, the wireless base station 1 sends a clock synchronization request 3 to the clock synchronization server 2 through the calibration data collection module 12, and records the sending time of the clock synchronization request 3 as the first time stamp T1. The first time s...
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The invention discloses a clock correcting method and a clock correcting system based on an IP network for a wireless base station, wherein the clock correcting method comprises a correction data collection process, in which the wireless base station acquires at least two groups of correction data, each of which includes first, second, third and fourth time stamps, wherein the first time stamp isthe time when the wireless base station sends a clock synchronization request to a clock synchronization server, the second time stamp is the time when the clock synchronization server receives the clock synchronization request, the third time stamp is the time when the clock synchronization server sends a clock synchronization response to the wireless base station, and the fourth time stamp is the time when the wireless base station receives the clock synchronization response; and a clock correction process, in which the wireless base station calculates a correction frequency error using thecorrection data and corrects the local clock according to the correction frequency error, wherein the correction frequency error is calculated according to a formula. The invention is capable of correcting the frequency offset of a wireless base station to provide a more accurate clock.
Description
Technical field [0001] The invention relates to clock synchronization of wireless base stations in the field of mobile communications, and in particular to a method and system for clock correction of wireless base stations based on an IP network. Background technique [0002] Global System For Mobile Communication (GSM) is the most widely used communication standard in mobile communication. The wireless access network of the GSM system is usually called the Base Station Subsystem (BSS), which is composed of a base station controller (BSC) and a BTS base station transceiver. It is connected to the mobile station through a wireless interface for wireless signal transmission, Receiving and wireless resource management. [0003] Wireless base stations require precise clock signals in order to provide precise timing in a variety of applications, such as air interface transmission. Generally, wireless base stations use TCX0 (Temperature Compensated Crystal Oscillator) voltage-controlle...
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IPC IPC(8): H04W56/00H04B7/26
CPCH04W36/385H04J3/0667
Inventor 杨锋姚幸林周辉邰春玲
Owner 深圳市恒程汇文化科技有限公司