CN101860392A - 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
- Publication number
- CN101860392A CN101860392A CN200910081635A CN200910081635A CN101860392A CN 101860392 A CN101860392 A CN 101860392A CN 200910081635 A CN200910081635 A CN 200910081635A CN 200910081635 A CN200910081635 A CN 200910081635A CN 101860392 A CN101860392 A CN 101860392A
- Authority
- CN
- China
- Prior art keywords
- clock signal
- vsat
- base station
- station
- main website
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Mobile Radio Communication Systems (AREA)
- Radio Relay Systems (AREA)
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 synchronization 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, as very small aperture satellite terminal station (Very Small ApertureTerminal, satellite communication VSAT) based on the IP technology.Have based on the base station of satellite communication multiple, as the base transceiver base station (Base Transceiver Station, BTS), the base station of TD base station or other types.
The BTS base station is that a kind of (Time Division Multiplexing, the TDM) base station of mode in the course of work of BTS base station, need to keep clock in the BTS base station and clock synchronization or the Frequency Synchronization of BSC based on time division multiplexing.If the BTS base station and frequency departure BSC big (as deviation surpass ± 0.65Hz), then can cause the skew of carrier frequency, user's speech quality is descended, even faults such as single-pass, call drop occur.Therefore, after BTS base station work a period of time, need test,, make itself and BSC synchronous if test result then needs in time to adjust the reference clock of BTS for deviation occurring to the reference clock of the clock board of BTS base station.
Be based on the IP transmission based on the satellite communication pattern of VSAT, and the IP data network does not possess the Frequency Synchronization function, the equipment that promptly needs to carry out Frequency Synchronization can't extract clock signal from circuit, and then can't carry out Frequency Synchronization.At present clock synchronization being carried out in the BTS base station is to utilize HA Global Positioning Satellite (GlobalPositioning System, GPS) receiver is realized.
Sampling GPS receiver carries out clock synchronization (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
0The headroom requirement, difficulty of construction is big when making antenna install; When the feeder line distance of antenna surpasses 110 meters, need guarantee signal strength signal intensity,, also make troubles to installation process because the feeder line of gps antenna is thicker under long distance by increasing relay amplifier.
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, increased the cost of base station every BTS 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, under the situation that does not adopt the GPS receiver, guarantees the clock synchronization 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 based on the very small aperture satellite terminal station VSAT main website of IP technology from base station controller BSC, and with described clock signal via satellite communications to VSAT end station;
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 the tranmitting data register signal;
The VSAT main website is used 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 synchronization 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 recovered to become 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 in the time of VSAT main website transmitted data stream.
The PHY chip that relates in the present embodiment is meant 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, as IP data format signal, and with modulated I P data format signal as data carry waiting for transmission in data code flow from BSC, and data code flow is transferred to VSAT end station via satellite according to the clock signal of BSC.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 the 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 synchronization 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, makes BTS base station and BSC keep clock synchronization.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 in a period of time, to this, in order to guarantee the clock synchronization between BTS base station and BSC as much as possible, can in VSAT end station, a phase-locked module of clock be set, whether the phase-locked module of this clock receives the clock signal of BSC in the time of setting according to VSAT, phase-locked, maintenance and three kinds of mode of operations of free-running operation can be arranged, described in detail respectively below.
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 phase-locked module of clock 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 the clock signal that whether receives BSC in 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 just, therefore, when not receiving the BSC clock signal in first setting-up time, it is constant that the phase-locked module of clock requires the BTS base station to keep clock signal to continue.
The phase-locked module of clock is in the maintenance pattern in this step, and just when losing reference clock signal, the clock signal according to preserved in the past makes the BTS base station keep original clock signal within a certain period of time.In present embodiment one, the duration that can set maintenance is 24 hours.
The 4th step: the VSAT terminal also picks up counting the timer zero clearing after the clock signal of preserving is sent to the BTS base station again, judges the clock signal that whether receives BSC in second setting-up time; If receive, then return the first step; Otherwise, carried out for the 5th step.
First setting-up time can be less than second setting-up time, and the length of 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 phase-locked module of clock 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 to receive the clock signal that BSC sends, and with described clock signal via satellite communications to VSAT end station 13; The VSAT end station 13 described clock signals that are used for receiving send 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 frequency are adjusted into the phase place and the frequency of 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 in self 21, 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 the phase-locked module 23 of clock, 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; The phase-locked module 23 of described clock 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 picking up counting when VSAT holds the physical chip equipment 22 at station 13 to extract described clock signal; The phase-locked module 23 of described clock is used for when the timing result of timer 23 reaches 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 zero clearings afterwards in the clock signal from VSAT main website 12 that the phase-locked module 23 of clock receives the last time and also picks up counting again; When the timing result that the phase-locked module 23 of described clock is used for timer 24 reaches 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, first setting-up time is less than second setting-up time.
By the method and system that the embodiment of the invention provides, under the situation that does not adopt the GPS receiver, realized the clock synchronization between base station and BSC; In the process of clock synchronization, when occurring to receive the clock signal of BSC continuously, the clock signal maintenance a period of time with the base station, guarantee the clock synchronization between base station and BSC as far as possible.
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 based on the very small aperture satellite terminal station VSAT main website of IP technology from base station controller BSC, and with described clock signal via satellite communications to VSAT end station;
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 the 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 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 also picks up counting the timer zero clearing again, if VSAT end station does not receive the clock signal from the VSAT main website in 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, first setting-up time is less than 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 the tranmitting data register signal;
The VSAT main website is used 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 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 to send 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 the phase-locked module of clock, 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;
The phase-locked module of described clock 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 picking up counting when the physical chip equipment that the VSAT end is stood extracts described clock signal;
The phase-locked module of described clock is used for when the timing result of timer reaches 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 phase-locked module of clock receives the last time sends to the base station, and picks up counting again;
The phase-locked module of described clock, when the timing result that is used for timer reached 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, first setting-up time is less than second setting-up time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910081635 CN101860392B (en) | 2009-04-07 | 2009-04-07 | Clock synchronization method and system of satellite communication-based base station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910081635 CN101860392B (en) | 2009-04-07 | 2009-04-07 | Clock synchronization method and system of satellite communication-based base station |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101860392A true CN101860392A (en) | 2010-10-13 |
| CN101860392B CN101860392B (en) | 2013-01-16 |
Family
ID=42946073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910081635 Active CN101860392B (en) | 2009-04-07 | 2009-04-07 | Clock synchronization method and system of satellite communication-based base station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101860392B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103716345A (en) * | 2012-09-29 | 2014-04-09 | 海尔集团公司 | IP-table issuing method of intelligent community network |
| WO2016165476A1 (en) * | 2015-08-03 | 2016-10-20 | 中兴通讯股份有限公司 | Clock synchronization method and system, end station and computer storage medium |
| WO2017024782A1 (en) * | 2015-08-07 | 2017-02-16 | 中兴通讯股份有限公司 | Clock synchronization method, device, base station and storage medium in a satellite communication network |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5790936A (en) * | 1992-10-26 | 1998-08-04 | Eon Corporation | Low power subscriber unit transmitting voice messages in a two-way communication system |
| KR20040092259A (en) * | 2003-04-25 | 2004-11-03 | 삼성전자주식회사 | system for synchronizing satellite clock in Base Transmission System and method for synchronizing satellite clock thereof |
| 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 |
| CN101039145B (en) * | 2007-03-30 | 2010-08-04 | 华为技术有限公司 | Method and apparatus for realizing clock |
| CN101257361B (en) * | 2008-04-03 | 2011-05-11 | 中兴通讯股份有限公司 | Method and net element for performing accurate time transmission through synchronous digital system network |
-
2009
- 2009-04-07 CN CN 200910081635 patent/CN101860392B/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103716345A (en) * | 2012-09-29 | 2014-04-09 | 海尔集团公司 | IP-table issuing method of intelligent community network |
| WO2016165476A1 (en) * | 2015-08-03 | 2016-10-20 | 中兴通讯股份有限公司 | Clock synchronization method and system, end station and computer storage medium |
| CN106413075A (en) * | 2015-08-03 | 2017-02-15 | 中兴通讯股份有限公司 | Clock synchronization method and system, and terminal station |
| WO2017024782A1 (en) * | 2015-08-07 | 2017-02-16 | 中兴通讯股份有限公司 | Clock synchronization method, device, base station and storage medium in a satellite communication network |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101860392B (en) | 2013-01-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101932092B (en) | Method and system for implementing macro base station clock synchronization and macro base station equipment | |
| CN101594190B (en) | Power system time synchronization method and device and power system thereof | |
| CN101247168B (en) | Time synchronization method and system | |
| KR100295708B1 (en) | Time synchronization method in cdma system | |
| CN106413075B (en) | Method and system for clock synchronization and end station | |
| CN102468898B (en) | The method, apparatus and system of time synchronized are realized in time division multiplex network | |
| CN101971557A (en) | Systems and methods for distributing GPS clock to communications devices | |
| KR100824044B1 (en) | Method and system for acquiring time sync between a base station in a communication system | |
| US20130154877A1 (en) | Wireless communication system and time synchronization method thereof | |
| CN102308643A (en) | Multiple redundant GNSS synchronization system | |
| US20070230697A1 (en) | Method and system for implementing synchronization between a receiving end and a source end of a broadcast television service | |
| US9942867B2 (en) | Cellular network synchronization methods and apparatus under separation architecture | |
| CN101860392B (en) | Clock synchronization method and system of satellite communication-based base station | |
| JP2006217359A (en) | Synchronizing device and method of mobile communication system | |
| US6377517B1 (en) | Method and system for synchronizing a time of day clock based on a satellite signal and a communication signal | |
| US6788947B2 (en) | Method for synchronization of base stations which are coupled to different switching system parts in a mobile radio network | |
| CN102892194A (en) | Wireless mobile simulcast system, synchronizing method and synchronizing equipment | |
| WO2009071011A1 (en) | A method, system and device for performing time synchronization in a time division multiplexing system | |
| CN108955623B (en) | Building deformation monitoring method and system using broadcast and television data broadcasting and foundation navigation beacon | |
| CN102185687B (en) | System and method for realizing clock synchronization among different units | |
| CN110518964B (en) | Satellite ground station high-precision time synchronization method based on radio over fiber network | |
| KR200379901Y1 (en) | UTC device of NTP server by using Sync signal of mobile communication system | |
| CN103686216A (en) | Medium wave synchronization broadcast system | |
| JP2013153242A (en) | Base station | |
| CN101355675B (en) | Method for implementing time synchronization of telecommunication network node equipment and apparatus thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |