CN101860392B - Clock synchronization method and system of satellite communication-based base station - Google Patents
Clock synchronization method and system of satellite communication-based base station Download PDFInfo
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- CN101860392B CN101860392B CN 200910081635 CN200910081635A CN101860392B CN 101860392 B CN101860392 B CN 101860392B CN 200910081635 CN200910081635 CN 200910081635 CN 200910081635 A CN200910081635 A CN 200910081635A CN 101860392 B CN101860392 B CN 101860392B
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Abstract
The invention discloses a clock synchronization method of a satellite communication-based base station. The method comprises the following steps: very small aperture terminal (VSAT) main station of a very small aperture satellite terminal station based on IP technology receives a clock signal from a base station controller (BSC) and transmits the clock signal to a VSAT end station through satellite communication; and the VSAT end station receives the clock signal, sends the clock signal to a base station and indicates the base station to use the clock signal as the reference clock signal. By using the method, clock synchronization of the base station and the BSC can be ensured without adopting a GPS receiver. The invention also discloses a clock synchronization system of the satellite communication-based base station.
Description
Technical field
The present invention relates to wireless communication field, relate in particular to a kind of method and system based on the clock synchronous in the base station of satellite communication.
Background technology
In some outlying districts or the base station of setting up, mountain area, because the geographical environment restriction can't be laid optical fiber, communication mode is realized base station and base station controller (Base Station Controller via satellite, BSC) communication between, such as the satellite communication based on the very small aperture satellite terminal station (Very Small Aperture Terminal, VSAT) of IP technology.Have based on the base station of satellite communication multiple, such as the base station of base transceiver base station (Base Transceiver Station, BTS), TD base station or other types.
The BTS base station is a kind of base station based on time division multiplexing (Time Division Multiplexing, TDM) mode, in the course of work of BTS base station, and the clock in the needs maintenance BTS base station and clock synchronous or the Frequency Synchronization of BSC.If the BTS base station and frequency departure BSC large (as deviation surpass ± 0.65Hz), then can cause the skew of carrier frequency, user's speech quality is descended, even the faults such as single-pass, call drop occur.Therefore, after BTS base station work a period of time, need to test the reference clock of the clock board of BTS base station, if test result then needs in time to adjust the reference clock of BTS for deviation occurring, make itself and BSC synchronous.
Satellite communication pattern based on VSAT is based on the IP transmission, and the IP data network does not possess the Frequency Synchronization function, and the equipment that namely needs to carry out Frequency Synchronization can't extract clock signal from circuit, and then can't carry out Frequency Synchronization.At present clock synchronous being carried out in the BTS base station is to utilize HA Global Positioning Satellite (Global Positioning System, GPS) receiver to realize.
Sampling GPS receiver carries out clock synchronous (Frequency Synchronization) and has following shortcoming:
1, when the antenna of GPS receiver is installed, more for the number of satellite that guarantees to receive, need to satisfy 120
0Clearance requirement so that antenna when installing difficulty of construction large; When the feeder line distance of antenna surpasses 110 meters, need to guarantee signal strength signal intensity by increasing relay amplifier, because the feeder line of gps antenna is thicker under long distance, also make troubles to installation process.
2, the destabilizing factor that extra GPS receiver may increase the BTS base station is installed in the BTS base station, and, owing to all the GPS receiver will be installed every BTS base station, increased the cost of base station.
Summary of the invention
The embodiment of the invention provides a kind of clock synchronizing method and system of the base station based on satellite communication, in the situation that does not adopt the GPS receiver, guarantees the clock synchronous of base station and BSC.
A kind of clock synchronizing method of the base station based on satellite communication, described method comprises:
Receive clock signal from base station controller BSC based on the very small aperture satellite terminal station VSAT main website of IP technology, and with described clock signal via satellite communications to VSAT end station, wherein, described clock signal is that BSC transfers to the VSAT main website by the IP interface;
Described VSAT end station receives described clock signal, and described clock signal is sent to the base station, and the indication base station is with the reference clock signal of described clock signal as the base station.
A kind of clock system of the base station based on satellite communication, described system comprises:
Base station controller BSC is used for by the IP interface to VSAT main website tranmitting data register signal;
The VSAT main website be used for to receive the clock signal that BSC sends, and with described clock signal via satellite communications to VSAT end station;
VSAT holds the station, and the described clock signal that is used for receiving sends to the base station, and the indication base station is with the reference clock signal of described clock signal as the base station.
The present invention is passed to VSAT end station by the VSAT main website with the clock signal of BSC, by indication base station, VSAT end station with the clock signal of BSC as reference clock signal, to realize the clock synchronous between base station and BSC.
Description of drawings
Fig. 1 is based on the clock synchronizing method step schematic diagram of the base station of satellite communication in the embodiment of the invention one;
Fig. 2 (a) and Fig. 2 (b) are based on the structural representation of the clock system of the base station of satellite communication in the embodiment of the invention two.
Embodiment
In order to realize the object of the invention, the frequency synchronization signal that the VSAT main website sends BSC (clock signal) is modulated to the data format signal, passage passes to VSAT end station via satellite, the VSAT end is stood and then this frequency synchronization signal is restored to standard-frequency signal from the data format signal, pass to the base station, and then realize the Frequency Synchronization between base station and the BSC.
Below in conjunction with Figure of description specific embodiments of the invention are described in detail.
As shown in Figure 1, in the embodiment of the invention one based on the clock synchronizing method step schematic diagram of the base station of satellite communication, suppose that the base station in the present embodiment one is the BTS base station, said method comprising the steps of:
Step 101:BSC is transferred to the VSAT main website with the clock signal of self.
In this step, BSC injects the clock signal of BSC physical layer (PHY) chip of VSAT main website to VSAT main website transmitted data stream the time.
The PHY chip that relates in the present embodiment refers to the chip with the external signal interface.
BSC is the data code flow by the IP protocol transmission.
Step 102:VSAT main website with the clock signal of the BSC that receives via satellite communications to VSAT end station.
The specific implementation of this step is: the VSAT main website is modulated to the data format signal with the clock signal of the BSC that receives, such as IP data format signal, and the IP data format signal after will modulating is carried in the data code flow from BSC as data waiting for transmission, and according to the clock signal of BSC data code flow transferred to VSAT end station via satellite.After VSAT end station receives data code flow from the VSAT main website, therefrom extract the described IP data format signal after the modulation, and demodulation is made as the clock signal of described BSC.
The clock signal of the BSC that step 103:VSAT end station will receive sends to the BTS base station, and the indication base station is with the reference clock signal of described clock signal as the base station.
In this step, VSAT end station not only can obtain and preserve the clock signal from BSC via satellite, can also safeguard an oscillator, obtains the clock signal of this oscillator.
Phase place and frequency that step 104:BTS base station is adjusted into reference clock signal with phase place and the frequency of the clock signal of self.
The clock signal of BSC transfers to the almost not infringement of precision that VSAT holds clock signal in the process of standing, and has guaranteed the clock synchronous between BTS base station and BSC.
Because BSC can be constantly to the clock signal of VSAT end station transmission self, therefore, VSAT end station can constantly send reference clock information to the BTS base station, make BTS base station and BSC keep clock synchronous.But, when network system operation goes wrong or during other factor affecting normal course of communications, VSAT end station may can't correctly obtain the clock signal from BSC within a period of time, to this, in order to guarantee as much as possible the clock synchronous between BTS base station and BSC, can in VSAT end station, a clock phase-locked loop module be set, whether this clock phase-locked loop module receives the clock signal of BSC within the time of setting according to VSAT, phase-locked, maintenance and three kinds of mode of operations of free-running operation can be arranged, and the below is described in detail respectively.
The first step: VSAT end station receives the clock signal of BSC, and described clock signal is sent to the BTS base station, requires the clock signal of BTS base station and reference clock signal to be consistent, and the clock phase-locked loop module is in phase lock mode.
In this step, the BSC clock signal that receives also will be preserved in VSAT end station, and further, VSAT can only preserve the last BSC clock signal that receives.
Second step: VSAT end station starts timer, judges whether receive the clock signal of BSC in the first setting-up time, if receive, then returns the first step; If do not receive, then carried out for the 3rd step.
The 3rd step: the VSAT terminal sends to the BTS base station with the clock signal of preserving, and requires the BTS base station to carry out work according to the clock signal that sends in this step.
Because the clock signal that sends in this step is the clock signal of the BSC that receives recently, the current clock signal in BTS base station namely, therefore, when not receiving the BSC clock signal in the first setting-up time, it is constant that the clock phase-locked loop module requires the BTS base station to keep clock signal to continue.
The clock phase-locked loop module is in Holdover mode in this step, and namely when losing reference clock signal, the clock signal according to preserved in the past makes the BTS base station keep within a certain period of time original clock signal.In present embodiment one, the duration that can set maintenance is 24 hours.
The 4th step: after the VSAT terminal sends to the BTS base station with the clock signal of preserving, with the timer zero clearing and restart timing, judge the clock signal that in the second setting-up time, whether receives BSC; If receive, then return the first step; Otherwise, carried out for the 5th step.
The first setting-up time can be less than the second setting-up time, and the length of the second setting-up time can be equal to or less than the duration that the BTS base station keeps original clock signal.
The 5th step: the VSAT terminal sends to the BTS base station with the clock signal of oscillator, makes the BTS base station with the clock signal of the oscillator clock signal as self.
In this step, the clock phase-locked loop module is in the free-running operation pattern, and under the free-running operation pattern, clock signal is limited by the clock signal of oscillator.
The embodiment of the invention two also provides a kind of clock system of the base station based on satellite communication, shown in Fig. 2 (a), described system comprises: base station controller 11, VSAT main website 12, VSAT end station 13 and base station 14, and wherein: base station controller 11 is used for the tranmitting data register signal; VSAT main website 12 is used for receiving the clock signal that BSC sends, and with described clock signal via satellite communications to VSAT end station 13; The described clock signal that VSAT end station 13 is used for receiving sends to base station 14, and indication base station 14 is with the reference clock signal of described clock signal as the base station; Base station 14 is used for the phase place of the clock signal of self and phase place and the frequency that frequency is adjusted into reference clock signal.
Shown in Fig. 2 (b), described base station controller 11 also sends data code flow; VSAT main website 12 receives described clock signal by the physical chip equipment 21 in self, and described clock signal is modulated to IP data format signal, and is carried in the data code flow from BSC, and the described data code flow of communications via satellite; Described VSAT end station 13 comprises physical chip equipment 22 and clock phase-locked loop module 23, wherein: described physical chip equipment 22 extracts the described IP data format signal after the modulation from the data code flow from VSAT main website 12, and demodulation is made as described clock signal; Described clock phase-locked loop module 23 is used for described clock signal is sent to base station 14, and indication base station 14 is with the reference clock signal of described clock signal as the base station.
Described VSAT end station also comprises timer 24, is used for beginning when VSAT holds the physical chip equipment 22 at station 13 to extract described clock signal timing; Described clock phase-locked loop module 23 is used for when the timing result of timer 23 reaches the first setting-up time, if VSAT end station 13 clock signals that do not receive from VSAT main website 12, the clock signal from the VSAT main website that then the last time is received sends to base station 14.
Described timer 24 further also is used for sending to base station 14 afterwards zero clearings and restarting timing in the clock signal from VSAT main website 12 that clock phase-locked loop module 23 receives the last time; When the timing result that described clock phase-locked loop module 23 is used for timer 24 reaches the second setting-up time, if VSAT end station 13 clock signals that do not receive from VSAT main website 12, then the clock signal with the oscillator 25 in the VSAT end station 13 sends to base station 14, wherein, the first setting-up time is less than the second setting-up time.
By the method and system that the embodiment of the invention provides, in the situation that does not adopt the GPS receiver, realized the clock synchronous between base station and BSC; In the process of clock synchronous, when occurring to receive continuously the clock signal of BSC, the clock signal maintenance a period of time with the base station, guarantee as far as possible the clock synchronous between base station and BSC.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1. the clock synchronizing method based on the base station of satellite communication is characterized in that, described method comprises:
Receive clock signal from base station controller BSC based on the very small aperture satellite terminal station VSAT main website of IP technology, and with described clock signal via satellite communications to VSAT end station, wherein, described clock signal is that BSC transfers to the VSAT main website by the IP interface;
Described VSAT end station receives described clock signal, and described clock signal is sent to the base station, and the indication base station is with the reference clock signal of described clock signal as the base station.
2. the method for claim 1 is characterized in that, the VSAT main website receives the clock signal from BSC, and described clock signal is transferred to VSAT end station, comprising:
The VSAT main website receives described clock signal by physical chip, and described clock signal is modulated to IP data format signal, and is carried in the data code flow from BSC, and the described data code flow of communications via satellite;
Described VSAT end station receives described clock signal, comprising:
Physical chip in the VSAT end station extracts the described IP data format signal after the modulation from the data code flow from the VSAT main website, and demodulation is made as described clock signal.
3. method as claimed in claim 2 is characterized in that, VSAT end station sends to described clock signal after the base station, and described method also comprises:
Phase place and frequency that described base station is adjusted into reference clock signal with phase place and the frequency of the clock signal of self.
4. the method for claim 1 is characterized in that, VSAT end station sends to described clock signal after the base station, and described method also comprises:
VSAT end station starts timer, if VSAT end station does not receive clock signal from the VSAT main website in the first setting-up time, then VSAT end station the clock signal from the VSAT main website that the last time is received sends to the base station.
5. method as claimed in claim 4 is characterized in that, the clock signal from the VSAT main website that VSAT end station receives the last time resends to after the base station, and described method also comprises:
VSAT end station is with the timer zero clearing and restart timing, if VSAT end station does not receive the clock signal from the VSAT main website in the second setting-up time, then VSAT end station sends to the base station with the clock signal of the oscillator in the VSAT end station, wherein, the first setting-up time is less than the second setting-up time.
6. the clock system based on the base station of satellite communication is characterized in that, described system comprises:
Base station controller BSC is used for by the IP interface to VSAT main website tranmitting data register signal;
The VSAT main website be used for to receive the clock signal that BSC sends, and with described clock signal via satellite communications to VSAT end station;
VSAT holds the station, and the described clock signal that is used for receiving sends to the base station, and the indication base station is with the reference clock signal of described clock signal as the base station.
7. system as claimed in claim 6 is characterized in that, described system also comprises:
The base station is used for the phase place of clock signal of self and phase place and the frequency that frequency is adjusted into reference clock signal.
8. system as claimed in claim 7 is characterized in that,
Described BSC is used for sending data code flow;
Described VSAT main website receives described clock signal by the physical chip equipment in self, and described clock signal is modulated to IP data format signal, and is carried in the data code flow from BSC, and the described data code flow of communications via satellite;
Described VSAT end station comprises physical chip equipment and clock phase-locked loop module, wherein:
Described physical chip equipment extracts the described IP data format signal after the modulation from the data code flow from the VSAT main website, and demodulation is made as described clock signal;
Described clock phase-locked loop module is used for described clock signal is sent to the base station, and the indication base station is with the reference clock signal of described clock signal as the base station.
9. system as claimed in claim 8 is characterized in that, described VSAT end station also comprises:
Timer is used for beginning timing when the physical chip equipment that the VSAT end is stood extracts described clock signal;
Described clock phase-locked loop module is used for when the timing result of timer reaches the first setting-up time, if VSAT end station does not receive the clock signal from the VSAT main website, the clock signal from the VSAT main website that then the last time is received sends to the base station.
10. system as claimed in claim 9 is characterized in that,
Described timer is used for zero clearing after the clock signal from the VSAT main website that the clock phase-locked loop module receives the last time sends to the base station, and restarts timing;
Described clock phase-locked loop module, when the timing result that is used for timer reached the second setting-up time, if VSAT end station does not receive the clock signal from the VSAT main website, then the clock signal with the oscillator in the VSAT end station sent to the base station, wherein, the first setting-up time is less than the second setting-up time.
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| CN 200910081635 CN101860392B (en) | 2009-04-07 | 2009-04-07 | Clock synchronization method and system of satellite communication-based base station |
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| CN 200910081635 CN101860392B (en) | 2009-04-07 | 2009-04-07 | Clock synchronization method and system of satellite communication-based base station |
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| CN103716345A (en) * | 2012-09-29 | 2014-04-09 | 海尔集团公司 | IP-table issuing method of intelligent community network |
| CN106413075B (en) * | 2015-08-03 | 2020-04-28 | 中兴通讯股份有限公司 | Method and system for clock synchronization and end station |
| CN106452642A (en) * | 2015-08-07 | 2017-02-22 | 中兴通讯股份有限公司 | Satellite communication network clock synchronization method and device and base transceiver station |
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| US20040213367A1 (en) * | 2003-04-25 | 2004-10-28 | Choel-Hee Han | Synchronizing satellite clock in base transceiver station |
| CN1756123A (en) * | 2004-09-29 | 2006-04-05 | 华为技术有限公司 | System and method for realizing base station time synchronism |
| CN101039145A (en) * | 2007-03-30 | 2007-09-19 | 华为技术有限公司 | Method and apparatus for realizing clock |
| CN101257361A (en) * | 2008-04-03 | 2008-09-03 | 中兴通讯股份有限公司 | Method and net element for performing accurate time transmission through synchronous digital system network |
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2009
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US5790936A (en) * | 1992-10-26 | 1998-08-04 | Eon Corporation | Low power subscriber unit transmitting voice messages in a two-way communication system |
| US20040213367A1 (en) * | 2003-04-25 | 2004-10-28 | Choel-Hee Han | Synchronizing satellite clock in base transceiver station |
| CN1756123A (en) * | 2004-09-29 | 2006-04-05 | 华为技术有限公司 | System and method for realizing base station time synchronism |
| CN101039145A (en) * | 2007-03-30 | 2007-09-19 | 华为技术有限公司 | Method and apparatus for realizing clock |
| CN101257361A (en) * | 2008-04-03 | 2008-09-03 | 中兴通讯股份有限公司 | Method and net element for performing accurate time transmission through synchronous digital system network |
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