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Author: admin    Add Date: 2011-11-21    Click: 434     Font Size:  Big  Medium  Small
In a mobile network, base station switching, such as roaming is required for accurate time control, so the synchronization problem for mobile communication importance is self-evident, but the vast majority of next generation mobile network technology, such as CDMA2000, TD-SCDMA, FDD-LTE, TDD-LTE were in need of high precision time synchronization technology.
Most of the current 3G technology standards, such as TDSCDMA, CDMA2000, WiMAX, including wireless broadband and the future of the LTE, both the presence of time synchronization requirements, but only GPS and IEEE 1588v2 can meet this demand. GPS clock program in each of the base stations to install the GP signal receiving apparatus, receiving satellite transmission clock signal, and then transmitted to the base station to realize the network synchronization. The programme is currently the main method to solve the problem of time synchronization, but its face" 3 tall" problem that has plagued the operator.
( 1) antenna installation survey and difficult
GPS antenna installation conditions are very harsh: to ensure the antenna good air horizon, central 45 degree cone space must be without any block; around 4 m diameter range may not have more than 20 cm metal objects; and the base station antenna is mounted vertically a distance greater than 3 m; not with omnidirectional antenna with horizontal installation. These requirements makes finding the right GPS antenna installation point becomes very difficult, a large number of GPS antenna is in a critical state. Small clock step will lead to a telephone line, crosstalk, noise and other issues, to the operator 3G network quality promotion brings the very big puzzle.
( 2) feeder laid
More and more 3G indoor coverage network also need to clock synchronization, but because the GPS antenna installation position demanding, indoor and outdoor GPS GPS receiver antenna is needed between laying extra-long feeder. Extra-long feeder laying need to wear a floor, wall, big construction difficulty, high cost of installation
( 3) difficult maintenance and high maintenance cost
Each of the base stations need to separate GPS module and receiving system, and dispersed in city, suburban and rural corners, the whole network GPS clock system is huge, the site difficult maintenance. In addition, the GPS module each year nearly 10% of the loss, lack of unified convenient GPS device management system, which are caused by the rising cost of network maintenance.
( 4) hidden safety problems, high investment risk
For the current civil service the United States GPS, no accuracy, all-weather security commitments, once a major event, local reduction of GPS precision, closure of a region of the GPS signal and other events may occur at any time, therefore, the mobile business dependent on GPS is a security risk. At the same time, and the base station supporting GPS device in our country the "Beidou" system cannot reuse, need to replace almost all of the hardware and software can with the "Beidou" adaptation, so once the GPS scheme for some reason is not available in the GPS, the huge investment will vanish like soap bubbles.
Odd micro IEEE 1588v2 network clock is a new generation of high precision clock, only needs the high accuracy clock source input bearing network, can use the IEEE 1588v2 protocol clock information is transmitted to each base station, realizes the whole net synchronization. IEEE 1588v2 clock solution has the following advantages:
( 1) to achieve zero cost whole net synchronization and depth of coverage
IEEE 1588v2 broke the packet network to transmit a clock signal history, support for IEEE 1588v2 a new generation of mobile bearing network only needs a high precision clock source clock signal input, can be accurately transmitted to each base station, realizes the network base station time and frequency of accurate synchronization. The scheme does not need any additional hardware devices, bearing network extends to where, where accurate clock cover. Time accuracy of submicrosecond, far exceeds the LTE business requirements of the millisecond level standard, realize the zero cost the depth clock cover.
( 2) strengthen the stability and security of communication network
IEEE 1588v2 technology in mobile bearing network, not only saves the GPS initial investment and high maintenance costs, reduce moving bearing network for receiving GPS signals caused 3G business dropped, noise, crosstalk and other issues, but also eliminate the mobile communication network is dependent on GPS, enhanced communication network security and stability.
( 3) improves the spectrum utilization rate
LTE system because of the frequency effect, ability to cover less than 2G / 3G system, requires more base stations to cover. IEEE 1588v2 in mobile bearing network application based on time synchronization LTE with precise time guarantee, which can greatly improve the precious and limited spectrum resource utilization.