WO2006122499A1 - Méthode et système de verrouillage d’horloge - Google Patents

Méthode et système de verrouillage d’horloge Download PDF

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Publication number
WO2006122499A1
WO2006122499A1 PCT/CN2006/001007 CN2006001007W WO2006122499A1 WO 2006122499 A1 WO2006122499 A1 WO 2006122499A1 CN 2006001007 W CN2006001007 W CN 2006001007W WO 2006122499 A1 WO2006122499 A1 WO 2006122499A1
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WIPO (PCT)
Prior art keywords
clock
locked
measurement
delay
time
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PCT/CN2006/001007
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English (en)
Chinese (zh)
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WO2006122499A8 (fr
Inventor
Yuxin Su
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Huawei Technologies Co., Ltd.
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Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2006122499A1 publication Critical patent/WO2006122499A1/fr
Publication of WO2006122499A8 publication Critical patent/WO2006122499A8/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/062—Synchronisation of signals having the same nominal but fluctuating bit rates, e.g. using buffers
    • H04J3/0632—Synchronisation of packets and cells, e.g. transmission of voice via a packet network, circuit emulation service [CES]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems

Definitions

  • the present invention relates to the field of communications, and in particular, to a method and system for locking a clock in a mobile communication system.
  • the transmitted signals are all digitized pulse sequences.
  • the rate must be completely consistent to ensure the accuracy of the information transmission. This is called "synchronization". Synchronization is the premise of information transmission in a communication system. The performance degradation of the synchronization system directly leads to a decrease in the performance of the communication system, and even makes the communication system inoperable.
  • wireless signals are transmitted.
  • the situation is far more complicated than the propagation of signals in guiding media such as cables or optical fibers.
  • Signals are more susceptible to weather, terrain, and external electromagnetic interference.
  • multipath effects and Doppler are also present. The influence of factors such as the Le effect, so that an accurate reference clock is needed, in order to correctly demodulate the signal from the carrier.
  • the base station clock center frequency deviation In the mobile communication system, if the base station clock center frequency deviation is too large, it will affect the work of other components of the base station, especially the carrier frequency offset, which may easily cause the user's call quality to decline, and even single-pass, dropped calls, etc. malfunction.
  • the wireless base stations are all at the end of the communication network, and the problems caused by the synchronization of the base stations are generally difficult to locate and are not easy to reproduce. For a long time, many people have a misconception that the base station's requirements for clock quality are not high enough to attract enough attention. In fact, the problem of base station synchronization directly affects the synchronization quality of wireless communication services.
  • the coverage of the wireless base station and the improvement of the network in order to improve user satisfaction and optimize the call drop rate, connection rate, paging success rate, crosstalk and other indicators of the network, it is necessary to set up the transmission and backbone synchronization network in the wireless network.
  • the good synchronization performance is extended to the end of the network, and the overall operational index of the network is improved.
  • GSM Global System for Mobile Communication
  • WCDMA Wideband Code Division Multiple Access
  • IP Internet Protocol
  • the existing network can be used to extract the reference clock frequency, it will greatly facilitate the installation of indoor picocell base station equipment and reduce the cost.
  • packet networks such as Ethernet are difficult to provide such high O.lppm.
  • the reference clock accuracy if it can solve the clock transmission problem of the packet network, is more conducive to the wide application of the cellular communication base station.
  • Two reference clock extraction methods are commonly used.
  • One is to connect a clock signal to a base station by connecting a dedicated clock line from a reference clock source such as BITS (Building Integrated Timing System).
  • BITS Building Integrated Timing System
  • GPS Global Position System
  • the code sequence of the measurement position used by GPS is a high-speed pseudo-random code that has been synchronized, which carries very stable clock information. Therefore, GPS synchronization signals are used as one of the synchronization clocks in many national communication systems.
  • This method requires each base station to be equipped with an independent GPS receiver. Their time unified signals are taken from the clock signals in each GPS signal. Since the time of the GPS satellites is accurate and stable with ⁇ , ⁇ , etc.
  • the high atomic clock is used to give time, so the time synchronization accuracy of the positioning pulses of each base station is high. However, the cost of this method is high, which makes it difficult to install a large number of picocell base stations.
  • the main object of the present invention is to provide a method and system for locking a clock, so that the device can directly extract a high precision reference clock on the packet network.
  • the present invention provides a method of locking a clock, the reference clock source side and the clock side to be locked are connected by a packet network, and the method comprises at least the following steps: Between the reference clock source side and the clock side to be locked, using the time information provided by the reference clock source and the clock to be locked, the transmission delay of the packet network is measured by the transmission and reception of a set of data frames, and the first minimum transmission is obtained by statistics. Time delay approximation;
  • the transmission delay of the packet network is measured by sending and receiving of a set of data frames, and the second minimum transmission delay approximation is obtained by statistics;
  • the second minimum transmission delay approximation value is subtracted from the first minimum transmission delay approximation value to obtain a clock deviation, and the frequency of the clock to be locked is adjusted accordingly.
  • the method is applied to a base station in a mobile communication system, and the to-be-locked clock is a clock of the base station.
  • the process of measuring the transmission delay of the packet network by sending and receiving of a set of data frames includes:
  • the measurement initiation side sends a delay measurement frame, where the delivery time t1 of the delay measurement frame is included; after receiving the delay measurement frame, the target side sends a predetermined number of measurements to the initiator side at a predetermined interval time. a reporting frame, where the t1 is included, the time t2 when the target side receives the delay measurement frame, and the time t3 when the target side returns the measurement report frame;
  • the originating side After receiving the measurement report frame, the originating side records the received time t4, and calculates the transmission delay of each measurement report frame according to the formula (t4-tl)-(t3-t2).
  • the process of measuring the transmission delay of the packet network by sending and receiving of a set of data frames includes:
  • the measurement initiating side transmits a predetermined number of delay measurement frames to the target side at a predetermined interval time, where the transmission side of the originating side is included;
  • the target side After receiving the delay measurement frame, the target side records the received time, and obtains its transmission delay by subtracting the transmission time of each delay measurement frame.
  • the clock deviation is sent to the clock side to be locked by the side that calculates the clock deviation.
  • the predetermined time interval between the two sets of data frame transmission and reception requirements is in the following range: a lower limit, such that the influence of the clock frequency difference change is greater than the influence of the network delay variation;
  • the upper limit makes the accuracy of the clock to be locked worse than the range required by the protocol;
  • the transmission time interval of adjacent frames in the set of data frames is required to be in the following range: a lower limit, which does not aggravate the network load, and makes each measurement uncorrelated;
  • the number of the set of data frames is required to be in the following range:
  • the packet network can be an Ethernet or Asynchronous Transfer Mode network.
  • the present invention also provides a system for locking a clock, comprising: a packet network, a reference clock source, a clock to be locked, and first and second synchronization devices connected to the packet network;
  • the reference clock source is configured to provide a local clock to the first synchronization device
  • the clock to be locked is used to provide a local clock to the second synchronization device
  • the first and second synchronization devices perform transmission and reception of two sets of data frames with each other by using a reference clock source and time information provided by the clock to be locked, wherein the interval between the two groups of data frames is preset;
  • the first or second synchronization device measures a transmission delay of the packet network, and separately obtains two minimum transmission delay approximation values, and then obtains a clock offset by using the difference;
  • the second synchronization device adjusts the frequency of the clock to be locked accordingly.
  • the second synchronization device is located at a base station side in the mobile communication system, and the to-be-locked clock is a clock of the base station.
  • the packet network can be an Ethernet or Asynchronous Transfer Mode network.
  • the minimum transmission delay of the packet network is a fixed value characteristic, and the transmission and reception of a sufficient number of measurement frames can be approximated with high precision.
  • Minimum transmission delay The reference clock source and the clock source to be locked (such as the clock in the base station) are connected to each other through a packet network, and two sets of measurement frames are sent and received at predetermined intervals (T), and two minimum transmission delay approximation values of the packet network are respectively calculated to obtain a T time.
  • T predetermined intervals
  • the clock frequency of the clock source is locked for adjustment.
  • the receiving and receiving of the measurement frame may be performed by using a request transmission method or a timing transmission method.
  • the difference in this technical solution brings about a more obvious beneficial effect.
  • the present invention has no special requirements for the packet network.
  • the high-precision reference clock frequency signal can be extracted from any packet network, and the adaptability is strong; the time interval between each measurement frame does not need to be too dense, and the network load is not increased. Will not affect the normal transmission of the network.
  • the present invention can achieve a high degree. Accuracy, enough to meet the requirements of cellular mobile communications to lock the base station clock.
  • FIG. 1 is a schematic diagram of a system for extracting a reference clock frequency from a packet network according to a first embodiment of the present invention
  • FIG. 2 is a specific flow of acquiring a reference clock frequency in a request/transmission manner according to a second embodiment of the present invention
  • FIG. 3 is a specific flow of acquiring a reference clock frequency by using a timing transmission method according to a third embodiment of the present invention.
  • FIG. 4 is a timing chart of transmitting and receiving data packets of a reference clock frequency in a request/transmission manner according to a second embodiment of the present invention
  • Fig. 5 is a timing chart showing the transmission and reception of a reference clock frequency by a timing transmission method according to a third embodiment of the present invention.
  • the invention is based on the fact that the minimum transmission delay of the packet network is a fixed value and the base station clock has a high stability.
  • the reference clock source and the base station transmit and receive two sets of data frames at a fixed time interval through the packet network to measure the clock. Deviation, where the data frame has time information of the reference clock source and the base station.
  • the reference clock frequency of the base station is adjusted based on the measured accurate clock offset.
  • Fig. 1 is a block diagram showing the structure of a lock clock system of a first embodiment of the present invention.
  • the two sides of the packet network 300 are the reference clock source side 100 and the clock side 200 to be locked, respectively.
  • the system for locking a clock proposed in this embodiment includes a packet network 300, a high-precision reference clock 110 as a reference clock source, a first synchronization device 120 and a second synchronization device 220 connected to the packet network 300, and a clock side to be locked.
  • the clock 210 is to be locked.
  • the clock to be locked in this embodiment is the clock of the base station.
  • the clock side 200 to be locked also includes a network interface 230 for implementing a connection between the terminal (e.g., a base station containing the clock 210 to be locked) and the packet network 300, and a connection between the synchronization device 220 and the packet network 300.
  • a network interface 230 for implementing a connection between the terminal (e.g., a base station containing the clock 210 to be locked) and the packet network 300, and a connection between the synchronization device 220 and the packet network 300.
  • the packet network 300 is used to implement the transmission of data packets between the reference clock source side 100 and the clock side 200 to be locked.
  • the packet network 300 mainly refers to a packet network connected in a wired manner.
  • the packet network in the present invention may be a commonly used Ethernet, or asynchronous transfer mode network, or an X.25 network or the like.
  • a high precision reference clock 110 as a reference clock source is used to provide a local clock to the first synchronization device 120.
  • the high precision reference clock 110 may be located on the base station controller side of the GSM with a GPS receiver.
  • the reference clock may also be located on the Radio Network Controller ("RNC") side of the WCDMA system.
  • RNC Radio Network Controller
  • the high-precision reference clock source ensures high-shield and high-efficiency operation of the network, and on the other hand, it can improve the support capability of the network for real-time services. This is because the synchronization performance of the data device will directly affect the transmission of the data interface. Efficiency, which affects the quality of service (QoS) performance of the service.
  • QoS quality of service
  • the high precision reference clock 110 in this embodiment is connected to the packet network 300 through the first synchronization device 210.
  • the high-precision reference clock 110 For the reference clock of the entire network, the terminal demodulates the received signal by using the reference clock. If the reference clock is inaccurate, the demodulated signal is incorrect and the communication quality is degraded.
  • the clock to be clocked 210 is used to provide a local clock to the second synchronization device 220.
  • the clock to be locked 210 is located on the base station side, but is not limited thereto, and may be any device connected to the packet network 300 and requiring a synchronous clock, such as a computer, a smart refrigerator, an IP telephone, or the like.
  • the first and second synchronization devices 120, 220 use the high-precision reference clock 110 on the reference clock source side and the time information provided by the clock to be locked 210 located on the base station side to measure the transmission of the packet network by transmitting and receiving two sets of data frames with each other.
  • the delay respectively, obtains the two minimum transmission delay approximation values, and obtains the clock deviation by the difference, and adjusts the frequency of the clock to be locked accordingly.
  • the interval between the two sets of data frames is a preset value.
  • One of ordinary skill in the art will recognize that it is not possible to obtain the true value of the minimum transmission delay by statistics, and it is only possible to approximate the true value as much as possible. In principle, the more samples that participate in the statistics, the closer the statistically obtained values are to the true values.
  • the first synchronization device 120 sends a delay measurement frame to the second synchronization device 220 through the packet network 300, where the delay time t1 of the delay measurement frame is included, and the time t1 is from the high-precision reference clock 110.
  • the second synchronization device 220 After receiving the delay measurement frame, the second synchronization device 220 sends a predetermined number of measurement report frames to the first synchronization device 120 at a predetermined interval, where the t1 is received, and the time t2 at which the delay measurement frame is received is received. And a time t3 at which the measurement report frame is returned, wherein the times t2 and t3 are from the base station clock.
  • the lower limit For the predetermined interval time setting, the lower limit should satisfy the condition that does not cause the network load to be aggravated, and the measurements are irrelevant; the upper limit should satisfy the frequency difference of the clock to be locked in the continuous measurement process.
  • the conditions under which the delay affects For a predetermined number of settings, the lower limit should satisfy the condition that the network transmission delay error can be considered small enough during the measurement, and the upper limit should satisfy the frequency difference of the clock to be locked in the continuous measurement process, which is not caused by the network transmission delay. The conditions of influence.
  • the first synchronization device 120 After receiving the measurement report frame, the first synchronization device 120 records the reception time t4. Similarly, the time t4 is from the high-precision reference clock 110, and is calculated according to the formula (t4-tl)-(t3-t2). The transmission delay to each measurement reported frame.
  • the transmission delay can also be obtained by another manner. Specifically, the first synchronization device 110 transmits a predetermined number of delay measurement frames to the second synchronization device 120 at a predetermined interval, including the transmission timing of the reference clock source side 100. The time interval here and the predetermined number of settings also need to meet the above requirements. Then, after receiving the delay measurement frame, the second synchronization device 220 records the reception time, and obtains its transmission delay by subtracting its transmission time from the reception time of each delay measurement frame.
  • the first and second synchronization devices 120, 220 have different methods for measuring the transmission delay of the packet network through the transmission and reception of a set of data frames.
  • the first minimum transmission delay approximation is obtained by statistics.
  • the transmission delay of the packet network is measured by the transmission and reception of a set of data frames, and the second minimum transmission delay approximation is obtained.
  • the second minimum transmission delay approximation value is subtracted from the first minimum transmission delay approximation to obtain a clock deviation, and the frequency of the clock to be locked is adjusted accordingly.
  • the present invention utilizes this feature to determine the clock offset of the clock to be locked to correct the clock to be locked.
  • the lower limit should satisfy the condition that the influence of the clock frequency difference changes far exceeds the influence of the network delay variation; the upper limit should satisfy the condition that the accuracy of the clock to be locked deteriorates not exceeding the requirements of the protocol. condition.
  • Figure 4 is a timing diagram of the transmit and receive packets in this mode.
  • the reference clock source side is located on the base station controller side in the GSM network
  • the clock source side to be locked is located on the base station side in the GSM network.
  • the clock to be locked is sent to the reference clock source side to send a delay measurement frame.
  • the delay measurement frame includes a time t1 at which the clock side sends a delay measurement frame to be locked, and the time t1 is from the clock of the base station on the clock side to be locked.
  • step 220 after the reference clock source side receives the delay measurement frame at time t2, and sends a predetermined number of measurement report frames to the clock side to be locked at a predetermined interval, wherein the measurement report frame includes the clock side to be locked.
  • Time t1 of the measurement frame, reference clock source side The time t2 to the delay measurement frame, and the time t3 at which the reference clock source side returns the measurement ⁇ frame, the time t2 and t3 are from the reference clock on the reference clock source side.
  • the number of transmissions of the measurement report frame is N1, and the time interval T1 between the measurement report frames is also fixed.
  • N1 the lower limit should satisfy the condition that the network transmission delay error can be considered small enough during the measurement, and the upper limit should satisfy the frequency difference of the clock to be locked in the continuous measurement process.
  • the time interval can be set to 1 second, and N1 is set to 1000.
  • the measurement clock source side sends a measurement report frame to the clock side to be locked, and a total of 1000 are transmitted.
  • Such a numerical selection will not affect the normal transmission of the network due to the increase of the network load, and also ensure that the locked clock frequency difference will not affect the network delay measurement.
  • step 230 the clock side to be locked is calculated to obtain the transmission delay of each measurement report frame, and the first minimum transmission delay approximation value is obtained.
  • the clock side to be locked receives the measurement report frame, the received time t4 is recorded, and a set of network transmission delays is calculated by (t4-tl)-(t3-t2), and the first is obtained statistically.
  • the minimum transmission delay is close to the value.
  • step 240 After a predetermined time interval, the clock side to be locked is further measured by the transmission and reception of the packet network by a set of measurement reporting frames in the same manner as described above, and the second minimum transmission delay approximation is obtained by statistics. .
  • the reference clock source side sends the second group of N2 measurement reporting frames to the to-be-locked clock side, and the measurement report frame includes the time to be locked by the clock side to send the delay measurement frame.
  • the clock side to be locked returns to the time t3' of the measurement report frame.
  • the interval at which each measurement report frame is sent is T2.
  • the lower limit thereof should satisfy the condition that the influence of the clock frequency difference changes far exceeds the influence of the network delay variation; the upper limit should satisfy the clock to be locked.
  • the accuracy deteriorates without exceeding the conditions of the agreement.
  • N2 can be set to 1500, T2 is set to 3 seconds, and T is set to 10 days, that is, the frame is reported after the first set of measurements is transmitted, and the time interval (T) is 10 After the day, the reference clock source side sends a measurement report frame to the clock side to be locked every 3 seconds, and a total of 1500 are sent. This also does not increase the network load, nor does it affect the normal transmission of the network.
  • the clock side to be locked records the time t4' at which each measurement report frame of the second group is received, according to the t1, t2, and t3' included in the measurement report frame, by the formula (t4'-tl)-(t3'-t2 Calculate the second group transmission delay and calculate the second minimum transmission delay approximation.
  • the to-be-locked delay side obtains a clock deviation by subtracting the first minimum transmission delay approximation from the second minimum transmission delay approximation, thereby adjusting the frequency of the clock to be locked.
  • the reference clock source side is located on the base station controller side in the GSM network
  • the clock source side to be locked is located on the base station side in the GSM network, so the base station side can directly adjust the clock to be locked according to the clock offset. frequency.
  • the reference clock source side sends a delay measurement frame to the clock side to be locked
  • the reference clock source side is located on the base station controller side in the GSM network, and the clock source to be locked is used. If the side is located on the base station side of the GSM network, the measurement report frame is sent to the reference clock source side by the clock side to be locked. Therefore, the clock offset is obtained by statistics and calculation from the reference clock source side.
  • the base station controller in the GSM network on the reference clock source side gets the clock offset. Therefore, the base station controller needs to transmit the clock deviation to the base station, and then the base station adjusts the clock frequency of the clock to be locked according to the clock deviation data, thereby ensuring the stability of the base station clock frequency.
  • the originating side is the reference clock source side with the high-precision reference clock
  • the clock source side to be locked is adjusted to be locked according to the clock bias.
  • Clock frequency If the initiator side is the clock source to be locked, adjust the clock frequency to be locked directly according to the clock offset.
  • the initiating side resends the delay measurement frame to the target side as needed, and restarts the process.
  • This method is applicable to the case where the number of base station synchronization devices managed under the network synchronization device is relatively small, and the delay measurement frame is transmitted only when frequency correction is needed, so that the number of timed packet transmissions can be reduced.
  • the specific flow of the timing transmission mode for extracting the reference clock frequency from the packet network will be described below with reference to FIGS. 3 and 5.
  • step 310 the reference clock source side transmits a predetermined number of delay measurement frames to the clock side to be locked at a predetermined interval time.
  • a set of delay measurement frames of the number N1 is sent by the reference clock source side, and the time interval T1 of sending each delay measurement frame is the same, and the frame includes the transmission time tl,
  • the locked clock side records the time t2 at which the delayed measurement frame is received.
  • the measurement initiation side is the reference clock source side, but in practical applications, it may also be the clock side to be locked.
  • the setting requirements for the number of delay measurement frames N1 and the event interval T1 of the transmission delay measurement frame are the same as those mentioned above.
  • N1 is set to 1500
  • T1 is 2 seconds. That is, the base station controller side that is the originating side sends one timing measurement frame to the base station every 2 seconds, and sends a total of 1500 delay measurement frames. .
  • the reference clock source side is located on the base station controller side in the GSM network, and the clock source side to be locked is located on the base station side in the GSM network, that is, the clock to be locked is the clock of the base station. It should be noted that in other embodiments, the reference clock source side may also be located on the radio network controller side in the WCDMA network. Correspondingly, the clock side to be locked is located on the Node B side in the WCDMA network, that is, the clock to be locked is Node. B's clock.
  • step 320 the clock side to be locked calculates the transmission delay of each delay measurement frame, and the first minimum transmission delay approximation is obtained.
  • each of the delay measurement frames transmitted by the reference clock source side includes its transmission timing t1 from the reference clock source side reference clock.
  • the time t2 at which the delay measurement frame is received is recorded, the time t2 is from the clock of the base station, and the time of receiving each delay measurement frame is subtracted.
  • the transmission time (t2-tl) is obtained, and the transmission delay of each delay measurement frame is obtained. And through statistics, determine the first minimum transmission delay approximating value.
  • the clock side to be locked further measures the transmission delay of the packet network through the transmission and reception of a set of data frames, and the second minimum transmission delay approximation is obtained.
  • the method and the first minimum transmission delay approximation value are the same, and are not described herein.
  • the lower limit should satisfy the condition that the influence of the clock frequency difference changes far exceeds the influence of the network delay variation; the upper limit should be full. The condition that the accuracy of the clock to be locked is deteriorated does not exceed the range required by the protocol.
  • the setting requirements are the same as explained above.
  • the base station controller side transmits one timing measurement frame to the base station side every 2 seconds, and transmits a total of 1200 delay measurement frames.
  • the second minimum transmission delay approximation value of each delay measurement frame of the second group is also obtained by subtracting the transmission time of each delay measurement frame from its transmission time.
  • the clock side to be locked obtains the clock deviation by subtracting the first minimum transmission delay approximation by the second minimum transmission delay approximation, thereby adjusting the frequency of the clock to be locked.
  • the reference clock source side is located on the base station controller side in the GSM network
  • the clock source side to be locked is located on the base station side in the GSM network
  • the measurement initiator side is the reference clock source side, that is, the base station The controller side sends a delay measurement frame to the base station side.
  • the base station side directly acquires the clock offset and adjusts the clock to be locked.
  • the same reference clock source side is located on the base station controller side in the GSM network, and the clock source side to be locked is located on the base station side in the GSM network, but the measurement initiation side is The clock side to be locked, that is, the delay measurement frame is transmitted from the base station side to the base station controller side.
  • the base station controller side acquires the clock offset and transmits it to the base station side, and then the base station side adjusts the frequency of the lock clock according to the received clock deviation.
  • the number of timing measurement frames of the number N1 can be sent to the reference clock source side of the clock to be locked, and the process is restarted.
  • the present invention is based on the fact that the minimum transmission delay of the packet network is a fixed value, and the clock deviation is obtained by calculating the minimum transmission delay approximation of the two sets of delay measurement frames, and the frequency of the locked clock is adjusted accordingly. .
  • the clock deviation is obtained by calculating the minimum transmission delay approximation of the two sets of delay measurement frames, and the frequency of the locked clock is adjusted accordingly.
  • the implementation is convenient, there is no special requirement for the packet network, and the adaptability is strong.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Computer Hardware Design (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L’invention concerne une méthode et un système de verrouillage d’horloge permettant à des dispositifs de procéder directement à un verrouillage de référence de haute précision à partir d’un réseau par paquets. Dans la présente invention, on exploite la caractéristique selon laquelle le retard minimal de transmission d’un réseau par paquets est une valeur fixe et selon laquelle le retard minimal de transmission peut être évalué avec précision en émettant et recevant une quantité suffisantede jeux de trames de mesure. Une source d’horloge de référence et une source d’horloge à verrouiller (par exemple, l’horloge d’une station de base) sont reliées par un réseau par paquets, deux jeux de trames de mesure se succédant pendant un temps prédéterminé (T) sont transmis et reçus, deux valeurs minimales de retard de transmission du réseau par paquets sont calculées respectivement, le décalage pendant la période T entre la source d’horloge de référence et la source d’horloge à verrouiller est obtenu, et la fréquence d’horloge de la source d’horloge à verrouiller est ajustée en fonction du décalage. La transmission des trames de mesure peut s’effectuer en mode transmission sur requête ou en mode transmission périodique.
PCT/CN2006/001007 2005-05-17 2006-05-17 Méthode et système de verrouillage d’horloge WO2006122499A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2005100258692A CN1866814B (zh) 2005-05-17 2005-05-17 锁定时钟的方法及其系统
CN200510025869.2 2005-05-17

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WO2006122499A1 true WO2006122499A1 (fr) 2006-11-23
WO2006122499A8 WO2006122499A8 (fr) 2008-01-03

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CN102202386B (zh) 2010-03-24 2014-05-07 华为技术有限公司 一种时钟同步的方法、装置和系统
CN101931400B (zh) * 2010-08-31 2012-09-05 新邮通信设备有限公司 一种基站时钟锁定方法和装置
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