CN101510801B - Method, system and base station and terminal for time adjustment - Google Patents
Method, system and base station and terminal for time adjustment Download PDFInfo
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- CN101510801B CN101510801B CN 200910119125 CN200910119125A CN101510801B CN 101510801 B CN101510801 B CN 101510801B CN 200910119125 CN200910119125 CN 200910119125 CN 200910119125 A CN200910119125 A CN 200910119125A CN 101510801 B CN101510801 B CN 101510801B
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Abstract
The invention discloses a method, a system, a base station and a terminal for time adjustment. The method comprises the following steps: a periodic distance-measuring message with simultaneous special distance-measuring code and sent by the terminal is received, and the absolute time of receiving the periodic distance-measuring message with simultaneous special distance-measuring code and sent by the terminal is recorded, with the recorded absolute time of T2; absolute time T1 sent by a first base station is received and is the time recorded by the first base station when the periodic distance-measuring message with simultaneous special distance-measuring code is received; the absolute time T is adjusted to be that T' equals to T plus Delta T according to the difference between the absolute time T1 and the absolute time T2: Delta T equal to T1 minus T2. In the technical proposal, the method that the terminal sends out the distance-measuring message of clock simultaneous periodic distance-measuring code to finish the determination of time difference between base stations is adopted, a reference time is sent out by a reference base station, and a non-reference base station amends the time thereof according to the reference time; therefore, clock synchronization meeting the synchronization requirement of WiMAX can be realized with low cost.
Description
Technical field
The present invention relates to communication technical field, be specifically related to a kind of time adjusting method, system and base station and terminal.
Background technology
At present, micro-wave access to global intercommunication (WIMAX, Worldwide Interoperability forMicrowave Access), as one of standard of 3-G (Generation Three mobile communication system) (3G), develops rapidly in the global radio wireless communications market.Because WiMAX is time division communication system, need to keep the clock synchronous between different base station; Otherwise, the problem that there will be signal to disturb.Particularly in critical point place of uplink and downlink, may occur that edge, community terminal is also in downlink data receiving, terminal under near non-serving base stations has started to have sent upstream data, the signal of its transmission just can interfere with the terminal at downlink data receiving, make the error in data of follow-up reception, cause the system service quality to reduce.Between existing different base station, the technology of clock synchronous is mainly: one, adopt the clock synchronous principle of satellite gps system to carry out synchronous between each base station; Two, there is no global positioning system (GPS, Global Position System) with in the situation of IEEE 1588 physical layer FPGA selectors need to select the preamble (Preamble) of other clocks ginseng base stations as the clock source that produces 1PPS, by this locality, adopt the OCXO+ phase-lock mode to produce system clock, by configuring the frame timing of determining system, by the system clock unification, send to subsystems.
In the research and practice process to prior art, the present inventor's discovery, scheme one needs external gps antenna, and complexity is installed, and cost is higher; Scheme two, in synchronizing process, need to stop the business of our station, and will carry out in the cycle, affects user's impression; Need realize that in base station terminal part function and startup stop the air interface synchronization process, realize complexity, workload is large.
Summary of the invention
The embodiment of the present invention provides time adjusting method and corresponding terminal and base station.
A kind of time adjusting method comprises:
The range finding of the cycle with the synchronization dedicated ranging code message that receiving terminal sends, and record the absolute time of receiving the described range finding of the cycle with synchronization dedicated ranging code message, the absolute time of described record is T2;
Receive the absolute time T1 that the first base station sends, described absolute time T1 is receiving the time with the cycle range finding message of synchronization dedicated ranging code of described the first base station record;
Difference between T1 and absolute time T2: Δ T=T1-T2 is adjusted into the absolute time T of self: T '=T+ Δ T.
A kind of time adjustment System comprises:
Terminal, for to the first base station and the second base station, sending the cycle range finding message with the synchronization dedicated ranging code, send and comprise the second Datagram report message in base station to described the first base station;
Described the first base station, the range finding of the cycle with the synchronization dedicated ranging code message sent for receiving described terminal, and record the absolute time of receiving the described range finding of the cycle with synchronization dedicated ranging code message, the absolute time of described the first base station record is T1; Receive the second Datagram report message in base station that comprises of described terminal transmission, according to the addressing information of the second base station in described report message, to described the second base station, send described absolute time T1;
Described the second base station, the range finding of the cycle with the synchronization dedicated ranging code message sent for receiving described terminal, and record the absolute time of receiving the described range finding of the cycle with synchronization dedicated ranging code message, the absolute time of described the second base station record is T2; Receive the absolute time T1 that described the first base station sends, according to the difference between described absolute time T1 and described absolute time T2: Δ T=T1-T2 is adjusted into the absolute time T of described the second base station: T '=T+ Δ T.
A kind of terminal comprises:
Receiving element, for receiving the second Datagram broadcast in base station that comprises of the second base station transmission;
The first transmitting element, for sending the cycle range finding message with the synchronization dedicated ranging code to the first base station and described the second base station;
The second transmitting element, for sending and comprise described the second Datagram report message in base station to described the first base station.
A kind of base station comprises:
Range finding message sink unit, for receiving the cycle range finding message with the synchronization dedicated ranging code;
Record cell, the absolute time T2 of the described range finding of the cycle with the synchronization dedicated ranging code message of receiving for record;
Adjustment time receiving element, the absolute time T1 sent for receiving the first base station;
Adjustment unit, the difference DELTA T=T1-T2 for according between described absolute time T1 and described absolute time T2 is adjusted into the absolute time T of self: T '=T+ Δ T.
A kind of base station comprises:
Range finding message sink unit, for receiving the cycle range finding message with the synchronization dedicated ranging code;
Record cell, receive the absolute time T1 of described cycle with synchronization dedicated ranging code range finding message for record;
The report message receiving element, for the second Datagram report message in base station that comprises of receiving terminal transmission;
Transmitting element, send described absolute time T1 for the second base station addressing information according to described report message to described the second base station, so that the time adjustment is carried out according to described absolute time T1 in the second base station.
The embodiment of the present invention adopts the range finding message of WiMAX terminal tranmitting data register ranging code synchronizing cycle, complete the method for determining relative time error between base station, send the reference time by individual reference base station, the non-reference base station that needs the adjustment time is carried out the correction of self time according to the described reference time, only need characteristic synchronous between neighboring station, with cheapest cost, reach and meet the synchronous clock synchronous required of WiMAX.
The accompanying drawing explanation
Fig. 1 is the flow chart of time adjusting method embodiment mono-of the present invention;
Fig. 2 is time of the present invention adjustment System embodiment structural representation of mono-;
Fig. 3 is the structural representation of terminal embodiment of the present invention;
Fig. 4 is the structural representation of base station embodiment mono-of the present invention;
Fig. 5 is the structural representation of base station embodiment bis-of the present invention.
Embodiment
The embodiment of the present invention provides a kind of time adjusting method, solves the problem of clock synchronous between base station.The embodiment of the present invention also provides corresponding system, base station and terminal.Below be elaborated respectively.
Embodiment mono-,
Refer to the flow chart that Fig. 1 is time adjusting method embodiment mono-of the present invention;
In the present embodiment, in advance at the interoperability (WiMAX of global microwave system, WorldwideInteroperability for Microwave Access) specifying one or several codes in cycle range finding (Ranging) code is the synchronization dedicated ranging code, increase the synchronous range finding type newly in range finding type in range finding message simultaneously, utilize the special ranging district order of designated user or the measurement result of terminal (described measurement result can be terminal measure respectively and the first base station and the second base station between path loss/winding time delay, and calculate the path loss seen with the first base station/winding time delay and and the second base station between path loss/meeting and the difference between time delay) come triggering terminal to carry out synchronous range finding.Setting a clock reference base station in appointed area is the first base station, and described the first base station has obtained good time and Frequency Synchronization by external global positioning system (GPS, Global Positioning System) or other clock sources.
The first base station connection standard clock source (as GPS card etc.), terminal is after the path loss or loopback delay of receiving the first base station and the second base station, if the difference of terminal and the first base station and terminal and the second base station path loss, or the difference of terminal and the first base station and terminal and the second base station loopback delay reaches default thresholding, terminal just triggers the cycle range finding message of tranmitting data register synchronization dedicated ranging code.In addition, also send out one and comprise described the second Datagram report message in base station to described the first base station, allow described the first base station the range finding T1 time of advent of record can be sent to described the second base station; The time difference calibration, the absolute time T ' after calibration=T+T1-T2, the absolute time before the correction that described T is the second base station self are calculated according to the range finding T2 time of advent of its record in described the second base station.The first base station is the clock reference base station in embodiments of the present invention, and the second base station is the base station that needs clock synchronous to adjust.In addition, can there be the rank level clock reference base station, as one-level clock reference base station, secondary clock reference base station etc.
Step 101, the second base station are carried out thick synchronous;
Described the second base station is from Network Capture distance measurement zone resource location, and the row clock of going forward side by side is slightly synchronous;
Concrete grammar can be to obtain mutually or relate to neighbor base stations by calcaneus rete network top-cross to obtain relevant clock information.Described the second base station can start or the process of operation in obtain clock alignment information by ground network, for example: the second base station near clock reference base station or Network Management Equipment obtain the thick absolute clock time, and using this as clock alignment information.The second base station also can obtain distance measurement zone resource location situation by ground network in the process that starts or move, as: the cycle of range finding and zone, or allocate in advance to the resource location of synchronous range finding etc., described the second base station according to the thick absolute time of obtaining and range finding relevant information carry out one thick synchronous.
Thick its distance measurement zone of range measurement resource position deviation that synchronously can avoid described the second base station to receive, and can't receive range finding message.Thick synchronous process can be that periodically carry out the second base station, with its distance measurement zone of range measurement resource position deviation that guarantees that receive described the second base station when the terminal triggering synchronous ranging process, and can't receive the range finding message of terminal transmission.
Step 102, terminal triggering synchronous ranging process;
Described terminal judges that according to measurement result having reached the condition that triggers transmission synchronization dedicated ranging code is the triggering synchronous ranging process;
In embodiments of the present invention, relevant information can be carried in described the first base station in broadcast at ordinary times, as: whether be the clock reference base station, if the clock reference base station can also comprise the grade of reference base station etc.Whether described terminal can analyze described base station through judgement after obtaining this information is reference base station, as crossed, be, what reference base station can also analyze and obtain described base station is, thereby instruct it whether to need to carry out the process of synchronous range finding, as: terminal judges that by the information of carrying in two base station broadcasts receiving one of them is clock reference base station or high-level clock reference base station, another one is non-clock reference base station or low-level clock reference base station, just possesses and can start this synchronous necessary condition.
Its Rule of judgment is the path loss/loopback delay between terminal measurement and described the first base station and described the second base station, when and the first base station between the path loss/value of winding time delay and the difference between the value of the path loss between described and the second base station/winding time delay be less than certain value, this value is an accuracy standard, according to different system requirements, different values can be set.
In order to prevent from eating dishes without rice or wine to propagate the impact of different delay, selected record and described the first base station between path loss (L=Eirp-Rssi) or loop time delay (RTD, Round Trip Delay) and and described the second base station between path loss or the more approaching terminal of loop time delay carry out synchronous range finding, be to set a value, when terminal measure path loss or loopback delay two difference is less than described set point as a result the time, described terminal can send the synchronization dedicated ranging code.In selecting close path loss or loop time delay process, influencing factor comprises multi-path effect and the decline that environment and weather cause, these factors can affect the accuracy of measurement, therefore in measuring process, terminal need to be filtered measurement result, solution is the thresholding of distinguishing direct projection footpath and multipath situation by arranging on terminal in the present embodiment, situation by acknowledge(ment) signal judges whether the triggering synchronous ranging process, think the direct projection footpath as what only have a strong signal in receiving the signal of same information, otherwise judge into the multipath situation, just can the triggering synchronous range finding yet.Therefore be can not initiate the synchronous range finding flow process for not meeting the terminal of carrying out the synchronous range finding condition and obtaining less than the synchronous range finding relevant information.Separately, if terminal in the situation that the path loss/value of winding time delay between judgement and the first base station and the value of the path loss between described and the second base station/winding time delay is close and judge it is all the direct projection footpath, just can the triggering synchronous ranging process.
Step 103, terminal send the cycle range finding message with the synchronization dedicated ranging code;
The first base station and the second base station receive the cycle range finding message of the synchronization dedicated ranging code of certain communication terminal, good frequency, time synchronized have been reached in the terminal of working under the first base station and described the first base station, and by the cycle find range and the first base station between keep synchronized relation.The signal of the special synchronous ranging code of terminal (the particularly terminal at edge, base station) emission, this signal can cover described the first base station and described the second base station.
Its distance measurement zone is not departed from the range measurement resource position of receiving for fear of described the second base station, therefore just require described the second base station to carry out slightly synchronously in step 101 before, guarantees whereby to avoid this problem to occur.
Step 104, terminal send and comprise the second Datagram report message in base station to the first base station after sending the cycle range finding message with the synchronization dedicated ranging code;
Terminal can be obtained the related news such as addressing information of the second base station by broadcast or the mutual unicast messages of the second base station.Because terminal is obtained the second Datagram mode in base station and is easy in the prior art realize, and can obtain by multiple channel, so do not do too much explanation in the explanation of the present embodiment.
Terminal sends to the first base station in the report message of the second base station relevant information and carries described the second base station addressing information, as identification information etc., after described the first base station receives described report message, can find described the second base station by ground network according to described addressing information.
The range finding of the cycle with the synchronization dedicated ranging code message that step 105, the first base station and the second base station receiving terminal send, and the absolute time of synchronization dedicated ranging code received in record;
Absolute time T1 when a, described the first base station receive the synchronization dedicated ranging code and record described the first base station reception synchronization dedicated ranging code;
Absolute time T2 when b, described the second base station receive the synchronization dedicated ranging code and record described the second base station reception synchronization dedicated ranging code.
Step 106, the first base station obtain the addressing information of the second base station according to the report message that terminal sends before, send the time T 1 of counterpart terminal synchronous range finding code to the second base station;
Step 107, the second base station are according to the difference between absolute time T1 and absolute time T2: Δ T=T1-T2 is adjusted into absolute time T: T '=T+ Δ T.
Described the second base station and described the first base station receive the clock synchronous cycle ranging code that described terminal sends in normal operation.The transmission cycle of special synchronous ranging code is T0, after receiving the special synchronous ranging code at every turn, described the second base station and described the first base station obtain this ranging code, and to the absolute time of our station, (absolute time of described the first base station record is T1, the absolute time of described the second base station record is T2), described the first base station can send to described the second base station by this time by ground network, if described the second base station finds that the absolute time recorded is different from the absolute time of described the first base station, the second base station is carried out clock recovery according to Δ T=T1-T2 to our station, be that described the second base station absolute time T becomes T '=T+ Δ T, thereby completed clock synchronous.
What deserves to be explained is that the embodiment of the present invention, also can be for the clock synchronous of InterRAT scene except for the Intra-RAT scene.
The present embodiment utilizes the range finding message of WiMAX terminal tranmitting data register ranging code synchronizing cycle, complete the method for determining relative time error between base station, by individual reference base station, the non-reference base station that needs the adjustment time is carried out the correction of self time according to the described reference time, only need characteristic synchronous between neighboring station, with cheapest cost, reach and meet the synchronous clock synchronous required of WiMAX.
Embodiment bis-,
Refer to Fig. 2 and be time of the present invention adjustment System embodiment structural representation of mono-; The embodiment of the present invention is the system of the method that adopts above-described embodiment to provide, comprises terminal 201, the first base station 202 and the second base station 203; Connect standard clock source (GPS card etc.) by described the first base station 202, described terminal 201 is after the path loss or loopback delay of receiving the first base station 202 and the second base station 203, if and the difference between the value of the path loss between the value of the path loss between the first base station/winding time delay and described and the second base station/winding time delay reaches thresholding, terminal 201 just triggers the cycle range finding message of tranmitting data register synchronization dedicated ranging code.In addition, also send out one and give described the first base station 202 about described the second Datagram report message in base station 203, allow described the first base station 202 the range finding T1 time of advent of record can be sent to described the second base station 203; The time difference calibration, the absolute time T ' after calibration=T+T1-T2 are calculated according to the range finding T2 time of advent of its record in described the second base station 203.
Further: terminal 201 also for: measure path loss or loopback delay, when the difference between the value of the path loss of 203 of the value of the path loss of 202 of described terminal 201 and the first base stations/winding time delay and described terminal and the second base stations/winding time delay is less than preset value, to the first base station 202 and the second base station 203, send the cycle range finding message with the synchronization dedicated ranging code.
The first base station 202, receive for receiving the range finding of the cycle with the synchronization dedicated ranging code message that described terminal sends, and recording the absolute time of receiving the described range finding of the cycle with synchronization dedicated ranging code message, the absolute time of described the first base 202 stations records is T1; Reception comprises described the second Datagram report message in base station 203, according to the addressing information of the second base station 203 described in described report message, to described the second base station, sends described absolute time T1;
The second base station 203, the range finding of the cycle with the synchronization dedicated ranging code message sent for receiving described terminal, and record and receive the described absolute time with the synchronization dedicated ranging code, the absolute time of described the second base station 203 records is T2; Receive the absolute time T1 that described the first base station sends, according to the difference between described absolute time T1 and described absolute time T2: Δ T=T1-T2 is adjusted into absolute time T: T '=T+ Δ T.
Further, described the second base station 203 also for: slightly synchronous from Network Capture distance measurement zone resource location and clock.
Embodiment tri-,
Refer to the structural representation that Fig. 3 is terminal embodiment of the present invention; In the present embodiment, specifying one or several codes in the cycle ranging code of WiMAX is the synchronization dedicated ranging code, newly-increased synchronous range finding type in the range finding type simultaneously, utilize measurement result on the special ranging district order of designated user or terminal to come triggering terminal to carry out synchronous range finding.
Receiving element 301, for receiving the second Datagram broadcast in base station that comprises of the second base station transmission;
The first transmitting element 302, for sending the cycle range finding message with the synchronization dedicated ranging code to the first base station and the second base station;
The second transmitting element 303, for sending and comprise described the second Datagram report message in base station to the first base station.
Further, described terminal can also comprise:
Measuring unit 304, for the path loss between measuring terminals and the first base station/winding time delay and and the second base station between path loss/loopback delay;
Judging unit 305,, trigger the first transmitting element 302 and send the described range finding of the cycle with synchronization dedicated ranging code message when the path loss between the path loss between terminal and the first base station/winding time delay and terminal and the second base station/loopback delay difference is less than preset value for judgement.
Embodiment tetra-,
Refer to the structural representation that Fig. 4 is base station embodiment mono-of the present invention;
Range finding message sink unit 401, for receiving the cycle range finding message with the synchronization dedicated ranging code;
Adjustment time receiving element 403, the absolute time T1 sent for receiving the first base station;
Further, described base station also comprises:
Addressing information transmitting element 405, for sending the addressing information of self by broadcast.
Embodiment five,
Refer to the structural representation that Fig. 5 is base station embodiment bis-of the present invention;
Range finding message sink unit 501, for receiving the cycle range finding message with the synchronization dedicated ranging code;
Report message receiving element 503, for the second Datagram report message in base station that comprises of receiving terminal transmission;
Transmitting element 504, send described absolute time T1 for the addressing information of the second base station according to described report message to the second base station, so that the time adjustment can be carried out according to described absolute time T1 in the second base station.
The base station of describing in base station in the present embodiment and embodiment tetra-can be same base station, and the described function of embodiment five is provided during as the reference base station when described base station, adopts the described function of embodiment tetra-when the base station of clock is adjusted in described base station as needs.
One of ordinary skill in the art will appreciate that all or part of step in the whole bag of tricks of above-described embodiment is to come the hardware that instruction is relevant to complete by program, this program can be stored in a computer-readable recording medium, and storage medium can comprise: ROM, RAM, disk or CD etc.
The above time adjusting method that the embodiment of the present invention is provided and system and base station are described in detail, applied specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof; , for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention simultaneously.
Claims (7)
1. a time adjusting method, is characterized in that, comprising:
The range finding of the cycle with the synchronization dedicated ranging code message that the second base station receiving terminal sends, and record the absolute time of receiving the described range finding of the cycle with synchronization dedicated ranging code message, the absolute time of described record is T2; Wherein, described terminal is after the path loss or loopback delay of measuring the first base station and described the second base station, if the difference of described terminal and described the first base station and described terminal and described the second base station path loss, or the difference of described terminal and described the first base station and described terminal and described the second base station loopback delay reaches default thresholding, the cycle range finding message of described terminal triggering tranmitting data register synchronization dedicated ranging code;
Described the second base station receives the absolute time T1 that described the first base station sends, and described absolute time T1 is receiving the time with the cycle range finding message of synchronization dedicated ranging code of described the first base station record;
Described the second base station is according to the difference between T1 and absolute time T2: Δ T=T1-T2 is adjusted into the absolute time T of self: T '=T+ Δ T.
2. time adjusting method according to claim 1, is characterized in that, before the range finding of the cycle with the synchronization dedicated ranging code message that described the second base station receiving terminal sends, also comprises:
Described the second base station is from Network Capture distance measurement zone resource location, and the row clock of going forward side by side is slightly synchronous.
3. time adjusting method according to claim 1, is characterized in that, described the second base station also comprises before receiving the absolute time T1 that described the first base station sends:
Described the second base station sends the addressing information of self by broadcast, described terminal sends to described the first base station by report message by described addressing information after receiving described addressing information.
4. time adjusting method according to claim 3, is characterized in that, the absolute time T1 that described the second base station receives described the first base station transmission is specially:
Described the second base station receives the described absolute time T1 that described the first base station sends according to described addressing information.
5. a time adjustment System, is characterized in that, comprising:
Terminal, for to the first base station and the second base station, sending the cycle range finding message with the synchronization dedicated ranging code, send and comprise described the second Datagram report message in base station to described the first base station;
Described terminal comprises: receiving element, for receiving the described second Datagram broadcast in base station that comprises of described the second base station transmission;
The first transmitting element, for sending the cycle range finding message with the synchronization dedicated ranging code to described the first base station and described the second base station;
The second transmitting element, for sending and comprise described the second Datagram report message in base station to described the first base station;
Described terminal also comprises:
Measuring unit, for measuring the path loss/loopback delay between path loss between described terminal and described the first base station/winding time delay and described terminal and described the second base station;
Judging unit,, trigger described the first transmitting element and send the described range finding of the cycle with synchronization dedicated ranging code message to described the first base station and described the second base station when the path loss between the path loss between described terminal and described the first base station/winding time delay and described terminal and described the second base station/loopback delay difference is less than preset value for judgement;
Described the first base station, the range finding of the cycle with the synchronization dedicated ranging code message sent for receiving described terminal, and record the absolute time of receiving the described range finding of the cycle with synchronization dedicated ranging code message, the absolute time of described the first base station record is T1; Receive the described second Datagram report message in base station that comprises of described terminal transmission, according to the addressing information of the second base station described in described report message, to described the second base station, send described absolute time T1;
Described the first base station comprises:
Range finding message sink unit, for receiving the cycle range finding message with the synchronization dedicated ranging code;
Record cell, receive the absolute time T1 of described cycle with synchronization dedicated ranging code range finding message for record;
The report message receiving element, for the described second Datagram report message in base station that comprises of receiving terminal transmission;
Transmitting element, send described absolute time T1 for described the second base station addressing information according to described report message to described the second base station, so that the time adjustment is carried out according to described absolute time T1 in described the second base station;
Described the second base station, the range finding of the cycle with the synchronization dedicated ranging code message sent for receiving described terminal, and record the absolute time of receiving the described range finding of the cycle with synchronization dedicated ranging code message, the absolute time of described the second base station record is T2; Receive the absolute time T1 that described the first base station sends, according to the difference between described absolute time T1 and described absolute time T2: Δ T=T1-T2 is adjusted into the absolute time T of described the second base station: T '=T+ Δ T;
Described the second base station comprises:
Range finding message sink unit, for receiving the cycle range finding message with the synchronization dedicated ranging code;
Record cell, the absolute time T2 of the described range finding of the cycle with the synchronization dedicated ranging code message of receiving for record;
Adjustment time receiving element, the absolute time T1 sent for receiving described the first base station, described absolute time T1 is receiving the time with the cycle range finding message of synchronization dedicated ranging code of described the first base station record;
Adjustment unit, the difference DELTA T=T1-T2 for according between described absolute time T1 and described absolute time T2 is adjusted into the absolute time T of self: T '=T+ Δ T.
6. time adjustment System according to claim 5, is characterized in that,
Described the second base station also comprises: thick lock unit, and for according to from Network Capture distance measurement zone resource location and clock, the coarse adjustment absolute time.
7. a terminal, is characterized in that, comprising:
Receiving element, for receiving the second Datagram broadcast in base station that comprises of the second base station transmission;
The first transmitting element, for to the first base station and described the second base station, sending the cycle range finding message with the synchronization dedicated ranging code, make described the first base station receive described cycle range finding message, and the absolute time T1 with the cycle range finding message of synchronization dedicated ranging code received in record, and make described the second base station receive described cycle range finding message, and the absolute time T2 of the described range finding of the cycle with synchronization dedicated ranging code message received in record;
The second transmitting element, for to described the first base station, sending and comprise described the second Datagram report message in base station, make described the first base station receive described report message, and according to described the second base station addressing information, send described absolute time T1 to described the second base station, so that described the second base station receives the described absolute time T1 that described the first base station sends, and according to the difference between described absolute time T1 and described absolute time T2: Δ T=T1-T2 is adjusted into the absolute time T of self: T '=T+ Δ T;
Measuring unit, for measuring the path loss/loopback delay between path loss between described terminal and described the first base station/winding time delay and described terminal and described the second base station;
Judging unit,, trigger described the first transmitting element and send the described range finding of the cycle with synchronization dedicated ranging code message to described the first base station and described the second base station when the path loss between the path loss between described terminal and described the first base station/winding time delay and described terminal and described the second base station/loopback delay difference is less than preset value for judgement.
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| CN 200910119125 CN101510801B (en) | 2009-03-02 | 2009-03-02 | Method, system and base station and terminal for time adjustment |
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| CN102006661B (en) * | 2010-12-06 | 2013-04-24 | 华为技术有限公司 | Method and base station for realizing time synchronization |
| CN102611547B (en) * | 2012-03-01 | 2014-09-17 | 浙江大学 | Intersatellite clock synchronizing system and method thereof |
| CN103916880B (en) * | 2013-01-05 | 2018-05-01 | 中兴通讯股份有限公司 | Clock bias information measuring method and device between a kind of website based on access burst |
| CN104349371A (en) * | 2013-08-02 | 2015-02-11 | 中兴通讯股份有限公司 | Detection method and device used for detecting reference clocks of base stations |
| WO2015180188A1 (en) * | 2014-05-30 | 2015-12-03 | 华为技术有限公司 | Synchronization method, synchronization device and base station |
| CN108347763B (en) * | 2017-01-24 | 2021-06-01 | 华为技术有限公司 | Time service method, terminal equipment and network equipment |
| WO2019095241A1 (en) * | 2017-11-16 | 2019-05-23 | 华为技术有限公司 | Time synchronization method and apparatus |
| CN111208866B (en) * | 2019-12-27 | 2022-10-28 | 视联动力信息技术股份有限公司 | System time adjusting method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101184222A (en) * | 2007-12-10 | 2008-05-21 | 上海华为技术有限公司 | Method and network element equipment for implementing video service in wireless communication system |
| EP2106157A1 (en) * | 2007-04-13 | 2009-09-30 | Huawei Technologies Co., Ltd. | Wireless communication system, air interface synchronizing method, base station and its controlling apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2106157A1 (en) * | 2007-04-13 | 2009-09-30 | Huawei Technologies Co., Ltd. | Wireless communication system, air interface synchronizing method, base station and its controlling apparatus |
| CN101184222A (en) * | 2007-12-10 | 2008-05-21 | 上海华为技术有限公司 | Method and network element equipment for implementing video service in wireless communication system |
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