Method, device and system for time synchronization

A technology of time synchronization and absolute time, which is applied in the field of communication, can solve problems such as difficulty in construction and difficulty in receiving GPS signals, and achieve the effect of realizing time synchronization and solving time synchronization problems

Inactive Publication Date: 2009-04-29
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the application of indoor base stations, due to the weak GPS signal in some indoor areas, it is difficult to receive GPS

Method used

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  • Method, device and system for time synchronization
  • Method, device and system for time synchronization
  • Method, device and system for time synchronization

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] Example 1

[0031] See figure 1 , An embodiment of the present invention provides a time synchronization method, including:

[0032] 101: Receive a time synchronization signal, the time synchronization signal may include 1 PPS per second and absolute time data;

[0033] 102: Send the time synchronization signal to the client for time synchronization through a wired medium.

[0034] Among them, 102 may specifically include:

[0035] 102A: Couple the time synchronization signal to a wired medium;

[0036] 102B: Broadcast the time synchronization signal on a wired medium;

[0037] 102C: The client performs time synchronization according to the received time synchronization signal.

[0038] Among them, 102A may specifically include:

[0039] Combining the second pulse 1PPS and absolute time data into a clock data frame;

[0040] After passing the clock data frame through spreading code plus spreading, filtering operations (such as shaping filtering and interpolation filtering,...

Example Embodiment

[0047] Example 2

[0048] In this embodiment, a base station with a GPS receiver and several base stations without GPS receivers need to be time synchronized. Among them, the base station with GPS receiver can be used as a time synchronization server, referred to as CLK Server; The base station of the GPS receiver acts as a time synchronization client, referred to as CLKClient for short. It is assumed that the CLK Server can receive GPS signals, and a CLK Server can support time synchronization with a larger coverage area by expanding multiple functional units. CLK Server and CLK Client have a wired medium connection relationship. Among them, the wired medium may include: low-voltage power line, coaxial cable (cable TV), twisted pair (telephone line), etc., of course, it may also be other wired medium.

[0049] See figure 2 , An embodiment of the present invention provides a time synchronization method, including:

[0050] 201: CLK Server receives 1PPS per second pulse and absolu...

Example Embodiment

[0058] Example 3

[0059] See Figure 6 , The embodiment of the present invention provides a time synchronization system, including a time synchronization device 601 and a client 602;

[0060] Wherein, the time synchronization device 601 receives the time synchronization signal, the time synchronization signal includes the second pulse 1PPS and absolute time data; through the wired medium, the time synchronization signal is sent to the client 602 for time synchronization; the client 602 is used for receiving The time synchronization signal is synchronized according to the time synchronization signal.

[0061] Among them, see Figure 7 , The time synchronization device 601 includes:

[0062] The receiving module 601A is used to receive a time synchronization signal, the time synchronization signal including the second pulse 1PPS and absolute time data;

[0063] The sending module 601B is used to send a time synchronization signal to the client for time synchronization through a wir...

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Abstract

The present invention pertaining to the technical field of communication discloses a time synchronization method, a device and a system thereof. The method comprises the steps of receiving time synchronization signals which comprise data of pulses per second (1PPS) and absolute times; transmitting the time synchronization signals to a client through a wired medium for performing time synchronization. The device comprises a receiving module and a transmitting module. The system comprises a device for time synchronization and a client. Therefore, time synchronization can be realized by the connection of current wired mediums between base stations, and Mus level time synchronization between indoor base stations is solved without adding wiring.

Description

technical field [0001] The present invention relates to the technical field of communication, in particular to a time synchronization method, device and system. Background technique [0002] The TDM (Time Division Multiplexing, Time Division Multiplexing) technology is used in the continuous networking application of the wireless communication system, and this technology requires high-precision time synchronization between base stations. For example, CDMA (Code Division Multiple Access, Code Division Multiple Access) 2000, TD-SCDMA (Time Division-Synchronous Code Division Multiple Access, Time Division Synchronous Code Division Multiple Access) and WiMAX (Worldwide Interoperability for Microwave Access, Global Microwave Interconnection Access) all require The synchronization accuracy is better than 10μs (microseconds). For WCDMA (Wideband Code Division Multiple Access, wideband code division multiple access), when it provides some value-added services (such as high-precision...

Claims

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Application Information

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IPC IPC(8): H04B7/26H04B1/69
CPCG04G5/00G04G7/00H04J3/0685
Inventor 周健黄晖罗彤
Owner HUAWEI TECH CO LTD
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