WO2000051366A2 - Signaux horodateurs utilisant les canaux communs de signalisation dans un reseau cellulaire de telecommunications - Google Patents

Signaux horodateurs utilisant les canaux communs de signalisation dans un reseau cellulaire de telecommunications Download PDF

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Publication number
WO2000051366A2
WO2000051366A2 PCT/SE2000/000194 SE0000194W WO0051366A2 WO 2000051366 A2 WO2000051366 A2 WO 2000051366A2 SE 0000194 W SE0000194 W SE 0000194W WO 0051366 A2 WO0051366 A2 WO 0051366A2
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WO
WIPO (PCT)
Prior art keywords
time
node
stamp value
master node
network
Prior art date
Application number
PCT/SE2000/000194
Other languages
English (en)
Other versions
WO2000051366A3 (fr
Inventor
Jacques Bugnon
Louis Paradis
Original Assignee
Telefonaktiebolaget Lm Ericsson (Publ)
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget Lm Ericsson (Publ) filed Critical Telefonaktiebolaget Lm Ericsson (Publ)
Priority to CA002364785A priority Critical patent/CA2364785A1/fr
Priority to JP2000601856A priority patent/JP2002538688A/ja
Priority to EP00915621A priority patent/EP1157485A2/fr
Priority to AU36851/00A priority patent/AU3685100A/en
Publication of WO2000051366A2 publication Critical patent/WO2000051366A2/fr
Publication of WO2000051366A3 publication Critical patent/WO2000051366A3/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
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2662—Arrangements for Wireless System Synchronisation
    • H04B7/2671—Arrangements for Wireless Time-Division Multiple Access [TDMA] System Synchronisation
    • H04B7/2678—Time synchronisation
    • H04B7/2687—Inter base stations synchronisation
    • H04B7/269—Master/slave synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2662—Arrangements for Wireless System Synchronisation
    • H04B7/2671—Arrangements for Wireless Time-Division Multiple Access [TDMA] System Synchronisation
    • H04B7/2678—Time synchronisation
    • H04B7/2687—Inter base stations synchronisation
    • H04B7/2693—Centralised synchronisation, i.e. using external universal time reference, e.g. by using a global positioning system [GPS] or by distributing time reference over the wireline network

Definitions

  • the present invention relates to cellular telecommunications, more particularly to the transmission of a time stamp value using the signalling channel for synchronising the nodes of a cellular network.
  • a cellular telecommunication network comprises different cellular systems, each one being operated by a cellular operator and comprising different nodes, such as Mobile Switching Centers (MSCs), one or more Home Location Registers (HLRs), a number of Visitor Location Registers (NLRs), and other nodes.
  • MSCs Mobile Switching Centers
  • HLRs Home Location Registers
  • NLRs Visitor Location Registers
  • the nodes consist of hardware devices running software programs in order to perform particular functions that allow the cellular system to provide the expected cellular service to subscribers.
  • time stamp value is used for different essential services provided in the cellular environment, such as for billing, regular maintenance, software updates of the programs running in the nodes, feature activation and deactivation, etc.
  • time synchronisation between nodes in the cellular telecommunication network is crucial as well, in order to insure consistency between databases located at different nodes of the same cellular system.
  • databases contain critical information related to billing, significant network-related events such as crush time, etc. For example, often times a call originates in one serving area having a first MSC and ends into another service area having a second MSC.
  • time synchronisation between the two MSCs is critical for producing consistent and accurate billing records.
  • Other nodes that are not directly supporting cellular calls such as the Operation Support System (OSS) node, also need accurate time value in order to record the exact time when alarms occur.
  • OSS Operation Support System
  • Fig. 1 wherein there is shown a part of a cellular telecommunication network 10 as known in the prior art. More precisely, Fig. 1 may be interpreted as representing either a portion of the cellular telecommunication network 10, as shown, or a portion of a cellular telecommunication system, operated by a unique cellular operator. Both cases are covered by the invention and Fig. 1 shows four cellular nodes 16a to 16d, the nodes communicating with each other through a trunk and signalling network 12. As stated, the prior art description, also illustrated in
  • FIG. 1 applies both to cellular networks and cellular systems, since the time sources are local and individually set-up for each node.
  • the different cellular nodes 16a to 16d individually receive a time stamp value having an independent origin, at regular intervals, from local time sources 18a to 18d that are independent from each other.
  • time drifts between the local time sources 18a to 18d used by each node 16a to 16d are induced in the time value transmitted to the nodes. Consequently, these time drifts, added to the errors coming from the separated clocks of each node, result in considerable time de-synchronisation between the nodes, which may even be of the order of a few minutes.
  • the prior art solution is also costly to implement, since multiple time sources have to be implemented in the telecommunication network, and separate applications have to be set-up and maintained for each node of the network.
  • a first node of the cellular network hereinafter called the either the first node or the time distributing master node
  • a reliable time source such as for example a Global Positioning System (GPS) terminal device
  • the time slave nodes in charge such as to Mobile Switching Centers, to Home Location Registers, to Visitor Location Registers, etc.
  • the time distributing master node is preferably an Operation Support System (OSS) or a Mobile Switching Center (MSC).
  • OSS Operation Support System
  • MSC Mobile Switching Center
  • the time slave nodes Upon receipt of the time stamp value, the time slave nodes correct the time drift of their own clocks, i.e. they synchronise their clocks based on the received time stamp value, so that they all become synchronised with each other.
  • the transmission of the time stamp value is done through the signalling network available in the cellular telecommunication system in place, which maybe for example a Signalling System 7 (SS7) or a Common Channel Signalling (CCS). Since these two types of signalling networks are the most common in the cellular networks, the Applicant will refer to the CCS/SS7 signalling network throughout the present application.
  • SS7 Signalling System 7
  • CCS Common Channel Signalling
  • the sequence of distributing the time stamp value in order to perform the synchronisation may be initiated either by the time distributing master node or by one of the time slave nodes, upon occurrence of particular events defined by cellular operators.
  • the sequence of distributing the time stamp value, or limited portions of it may be manually initiated by a network administrator.
  • the synchronisation sequence may be initiated by one of the slave nodes that detects that a time correction is required, such as after a reboot or a power down period that may have affected the time slave node internal clock.
  • the time slave node signals the time distribution master node with a time synchronisation request through the CCS/SS7 signalling channel, the master node requests the accurate time stamp value from the time stamp source and forwards it to the time slave node over the same CCS/SS7 signalling channel.
  • It is another object of the present invention to provide a cellular telecommunication network comprising: a time source for generating a time stamp value; at least one first node receiving said time stamp value through a communication link; and a signalling network connecting a plurality of second nodes of said cellular telecommunication network and said first node, at least one of said plurality of second nodes receiving said time stamp value from said first node through said signalling network, said at least one of said plurality of second nodes synchronising its own clock upon receipt of said time stamp value.
  • Yet another object of the present invention is to provide a cellular telecommunication network, comprising: a time source for generating a time stamp value; a plurality of time slave nodes, each of said time slave nodes having an internal time stamp value; a signalling network connecting a plurality of nodes of said cellular telecommunication network, including said time slave nodes; and at least one time distributing master node monitoring said internal time stamp value of at least one of said plurality of time slave nodes through said signalling network, said time distributing master node comprising detection means for detecting a time-drift of said internal time stamp value of at least one of said time slave nodes, wherein upon detection of a time-drift in said internal time stamp value of at least one of said second nodes by said detection means of said time distributing master node, the time master node transmits a time stamp value received from said time source to said at least one time slave node through said signalling network, said at least one time slave node using said time stamp value for synchronising its own clock upon receipt of
  • Figure 1 illustrates a prior art method used by cellular nodes for acquiring time stamp value from local independent time sources
  • Figure 2 shows a high-level network diagram of the invented system
  • Figure 3 is a signalling diagram of a preferred embodiment of the invention, wherein the time synchronisation sequence is initiated by the occurrence of an event at a time distributing master node;
  • Figure 4 is a signalling diagram of another preferred embodiment of the invention, wherein the time synchronisation sequence is initiated by the occurrence of an event at a time slave node;
  • Figure 5 is a signalling diagram of another preferred embodiment of the invention, wherein a master node monitors time slave nodes and initiates a time synchronisation sequence upon detection of a time-drift at one particular time slave node; and
  • Figure 6 is a high-level network diagram of the invented system according to another preferred embodiment of the invention related to the redundant time distributing master node.
  • the time source 24 is a unique time source that provides a unique time stamp value to the time distributing master node 20.
  • other implementations are possible as well, such as having a pair of time distributing master nodes consisting of a primary master node and a redundant master node, each one being connected to a time source for redundancy purposes.
  • time distributing master node (abbreviated “master node”) and “time slave node” (abbreviated “slave node”) are utilised herein for reference to the distribution of the time stamp value only, and not for referencing to the regular operation of the cellular nodes.
  • master node time distributing master node
  • slave node time slave node
  • the Applicant will refer to the signalling network throughout the present application as the CCS/SS7 signalling network as being the communication medium used for performing the time synchronisation sequence.
  • the use of the signalling network of the cellular telecommunication network for the transmission of the time stamp value is one of the key parts of the present invention.
  • the present invention would only apply for individual cellular telecommunication systems, since each such system is operated by a particular cellular system operator, i. e. a particular company, that manages and maintains its own system.
  • a particular cellular system operator i. e. a particular company
  • interactions between cellular systems become more and more frequent, and roaming from one system to another becomes more and more transparent. Consequently, it would be possible and more and more useful to also apply the present invention to the entire continental or the international cellular telecommunication network 10, so that the clocks of all cellular nodes across the continent or across the world become perfectly synchronised. It is therefore assumed that even if throughout the present application
  • the master node 20 may preferably be an Operation Support System (OSS) node whose primary function is to monitor and manage the functioning of the other nodes of the cellular telecommunication network 10.
  • OSS Operation Support System
  • the master node 20 may be as well an MSC or any other node that is part of and connected to the cellular telecommunication network 10 through a CCS/SS7 signalling network 14 of the telecommunication network 10.
  • each one of the slave nodes 22a to 22c is connected to the CCS/SS7 signalling network 14 through corresponding signalling links 28a to 28d.
  • the signalling network 14 is preferably a CCS/SS7 signalling network that is mainly utilised for setting up and for surveillance of calls.
  • the centralised time source 24 is preferably a unique time source, such as GPS terminal device, that provides a very accurate time stamp value.
  • the master node 20 receives this time stamp value through a communication link 27 and immediately forwards it to the slave nodes 22a to 22c through the CCS/SS7 signalling network 14. Upon receipt of the time stamp value, each one of the slave nodes 22a to
  • the term "perfectly synchronise" means that the clocks of the master node 20 and of the slave nodes 22i are synchronised within an acceptable error range with respect to each other, which in the existing cellular telecommunication networks maybe of the order of half a second to one second.
  • time synchronisation Since one of the main purposes of the time synchronisation is to allow both sufficiently consistent and sufficiently accurate records regarding the billing and the alarm flags, and since usually these records contain a time stamp precise to one second, a time synchronisation having the same precision, i.e. up to the order of one second is believed to be sufficient.
  • a time synchronisation-initiating event maybe previously programmed by a network operator in order to initiate that sequence. Such an event may be the expiration of a pre-defined time period, so that the time synchronisation is performed at pre-defined time intervals, the detection of a network or slave-node-related error that may have induced a time-drift at one or more slave nodes, or any other event that may affect or require the time synchronisation.
  • the master node 20 may further comprise detection means 21 as better shown in Fig. 2, in dotted line, since the detection means 21 are optinal and specific to this preferred embodiment of the invention.
  • the detection means 21 maybe for example, program modules being set up in order to monitor and detect the presence of the described time synchronisation- initiating event.
  • the detection means may be hardware modules which function is to detect the master node time synchronisation event 30, or any other means judged suitable for performing this detection function in the cellular telecommunication network.
  • This event may also be the down status of the CCS/SS7 signalling network. This will start the time synchronisation sequence after a crush period of the network on the assumption that the crush could have induced a time drift in the node clocks.
  • the master node 20 After the detection of the event, action 30, by the detectection means 21, the master node 20 immediately requests the time stamp value from the time source 24 through a TIME REQUEST signal 32. Upon receipt of the signal 32, the time source
  • the master node 20 then forwards the time stamp value through a TIME FORWARD message 36 to a first slave node 22a, which upon receipt of the time stamp value uses that value in order to synchronise its own internal clock 23a, through action 38.
  • the slave node time synchronisation 38 is completed, the slave node
  • the 22a may respond back to the master node 20 with a Time Forward Acknowledgement 40 in order to inform the master node that the operation was successful.
  • the master node 20 is informed through the same message 40 of the failure of the operation, and the time stamp value is then read again form the time source 24 and re- transmitted to the slave node 22a.
  • this re-transmission is not illustrated. Given the fact that the information forwarded to the slave nodes is the time stamp value, the delay for forwarding is critical.
  • the time stamp value may be read again by the master node 20 from the time source 24.
  • this worst case only seldom happens, so that reading only once the time stamp value from the time source 24, as illustrated in FIG. 3, is sufficient for providing the synchronisation accuracy needed in a common cellular system 10.
  • the delay for performing the totality of the synchronisation sequence described beforehand is less than the maximum tolerable error induced in the time synchronisation, provided that a reasonable number of slave nodes 22i are synchronised.
  • a similar sequence is performed for all subsequent slave nodes from the cellular telecommunication network 10 that are set-up for receiving the time stamp value from the same master node 20.
  • the master node 20 may then wait for receiving these Acknowledgement messages independently and in a succeeding manner.
  • FIG. 4 of the Drawings wherein a second preferred embodiment of the invention is disclosed.
  • the slave nodes 22i that initiate their individual time synchronisation, upon detection of a slave node time synchronisation-initiating event, action 50, at the slave node 22i.
  • action 50 a slave node time synchronisation-initiating event
  • FIG. 4 such a situation involves one slave node only, designated 22a in FIG. 4.
  • the slave node time synchronisation initiating-event may be the detection of a significant time-drift in the internal clock 23a of the slave node 22a, the occurrence of a power-down period followed by a system recovery, that may have induced a time-drift, the presumption that a time- drift may exist between the internal clock 22a and other node's clock, such as for example 23b, or any other automatically or manually-performed event defined by a network operator or administrator.
  • the slave node too may monitor the status of the CCS/SS7 signalling network, and then initiate the synchronisation sequence after a crush period that could have induced a time drift in its clock.
  • the slave node 22a comprises detection means 25a, better seen on Fig. 2, in dotted lines, since the detection means 25i are optional and specific to this preferred embodiment of the invention.
  • the detection means 25i may be, for example, software modules previously set up by a network administrator in order to monitor and detect the slave node time synchronisation initiating event 50.
  • an application program may be programmed in order to regularly monitor for occurrence, or for a previously determined probability of occurrence, of these events and for triggering the time synchronisation.
  • slave node detection means 25i may be hardware modules set up to perform the required tasks, or any other suitable means.
  • the action 50 may be a manually-activated event, such as the manual activation of the time synchronisation sequence by a network administrator.
  • a manually-activated event such as the manual activation of the time synchronisation sequence by a network administrator.
  • the most frequent time synchronisation initiating event that can occur in practice is the recovery of a system after a crush period.
  • a TIME SYSNCHRONISATION REQUEST message 52 is sent by the slave node 22a to the master node 20.
  • the master node 20 requests the time stamp value from the time source 24 through a TIME REQUEST message 32, and obtains the value through a Time Request response message 34.
  • the master node 20 immediately forwards the time stamp value to the slave node 22a through a Time Synchronisation request response message 54.
  • the slave node 22a Upon receipt of the time stamp value, the slave node 22a immediately synchronises its own internal clock 23 a using value, and upon success of the operation 38, returns back a TIME SYNCHRONISATION REQUEST ACKNOWLEDGEMENT 58 to the master node 20, in order to inform the master node 20 of the success/failure of the operation. In case of failure, the time synchronisation sequence may be entirely repeated. However, it is considered that this worst case only seldom happens, so it was not illustrated in FIG. 4.
  • the master node 20 regularly monitors the time value of the internal clocks 23i of each slave node 22i, and upon detection of a significant time-drift by the detection means 21 of the master node 20, better seen on Fig. 2, that may be, for example, greater than a pre-defined threshold value, performs a time synchronisation for this particular slave node.
  • a significant time-drift by the detection means 21 of the master node 20, better seen on Fig. 2
  • the described synchronisation sequence relating to this preferred embodiment starts with the detection of a master node time synchronisation event, action 60, such as the expiration of a pre-defined time period, or any other event previously set-up by a network operator or administrator in the detection means 21 of the master node 20.
  • action 60 such as the expiration of a pre-defined time period, or any other event previously set-up by a network operator or administrator in the detection means 21 of the master node 20.
  • Such an event may be as well the manual activation of the sequence.
  • the master node 20 Upon occurrence of the master node time synchronisation event, action 60, the master node 20 starts monitoring the slave nodes 22i.
  • FIG. 5 only shows 2 different slave nodes 22a and 22b, but it is to be understood that a larger number of slave nodes 22i may be monitored by a master node 20 during the same synchronisation sequence.
  • the master node 20 transmits a TIME MONITOR message 62 to the slave node 22a in order to read the time value 63 of the slave node 22a. This time value 63 is returned back to the master node 20 through the Time Monitor response message 64.
  • the master node Upon receipt of the slave node time value 63, the master node requests the time stamp value from the time source 24, and obtains it through the Time Request Response message 34, as previously described in the present application. Having both the time stamp value obtained from the time source 24 and the slave node time value 63, the master node 20 may compare them, through action 66. In the present situation it is assumed that the time stamp value and the slave node time stamp value 63 differ by more than a threshold value previously defined.
  • the master node transmits the time stamp value to the slave node 22a through the TIME FORWARD message 36 and, upon receipt of the time stamp value, the slave node 22a immediately synchronises its internal clock 23a, action 38, thus eliminating the time-drift that caused the time synchronisation sequence to be initiated.
  • the slave node 22a responds back with a Time Forward Acknowledgement message 40 in order to inform the master node 20 of the success/failure of the operation 38. In case of failure, the portion of the synchronisation sequence concerning that particular node 22a may be entirely repeated.
  • the synchronisation of the remaining slave nodes whose time values depend of the same master node 20 continues.
  • the same procedure is applied to all remaining slave nodes, one node at a time.
  • the remaining part of FIG. 5, shows the case wherein the difference between the time value 63 of the slave node 22b and the time stamp value provided by the time source 24 is less than the pre-defined threshold value.
  • the master node 20 terminates the synchronisation for that particular node, since there is no need for sending the time stamp to the slave node 22b.
  • the time stamp value is read again from the time source 24. This may minimise delays that could generate errors in the time stamp value, between the moment of reading the time stamp value to the moment of the evaluation 66.
  • the synchronisation sequences described in FIG. 3 and 4 may be adapted in order to include the synchronisation of the master node 20, each time the time value is read from the time source 24.
  • the master node 20 may be set-up in such a manner that each time it reads the time stamp value from the time source 24 it also synchronises it own internal clock 23 through action 37, similar to the one performed by each slave node 22i, as shown in FIG. 3 and 4.
  • various implementations of the invention may be applied for the synchronisation of the master node 20, which has a direct connection to the time source 24.
  • This may take the form of a regularly performed independent synchronisation that only involves the master node 20 and the time source 24 (this variant is not shown), or may be part of a global synchronisation sequence during which the master node 20 may synchronise its own clock 23 as well, when performing synchronisation of other clocks 23i of the slave nodes 22i, as shown in FIG. 3 and 4.
  • the result of such a synchronisation sequence is that a plurality of nodes of the cellular telecommunication network 10 have internal clocks that are synchronised using the same time stamp value, so that time drifts between co-operating nodes are eliminated.
  • the master node 20 may be a primary master node 20a and may be redundant, i.e. another node, called the redundant master node 20b may be set-up in the cellular telecommunication network for performing the time synchronisation functions when the primary master node is not available, such as when a crash of the primary master node occurs, or when the network portion joining the primary master node to the rest of the cellular nodes has crushed.
  • the redundant master node 20b may be preferably an OSS node, or any other node of the cellular telecommunication system, such as an MSC.
  • the functioning of the primary master node 20a may be regularly monitored by the redundant master node 20b, preferably through the same CCS/SS7 signalling network 14, and when a malfunction related to the incapacity of the primary master node 20a to perform time synchronisation for the slave nodes is detected, the redundant master node 20b may immediately replace the primary master node and perform these tasks.
  • the redundant master node 20b may receive the time stamp value from the same time source 24 through a communication link 27, as shown in FIG. 6, or from any other time source connected to the redundant master node 20b.
  • a converting function for converting the time stamp value received by each one of the slave nodes 22i according to the local time zone of each slave node.
  • the converting function may take in consideration the time zone of the time source 24 and/or of the master node 20, and the time difference between the time zone of the time source and/or the master node, and the slave node receiving the time stamp value.
  • One of the numerous advantages of the present invention is that it provides an economic and easy-to-implement method for completely eliminating time drifts in a cellular telecommunication system. Having a central time stamp value being distributed to a plurality of nodes using the existing CCS/SS7 signalling network is a tremendous improvement over the existing systems that have separate time sources for each node.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

L'invention porte sur un système horodateur et le procédé associé pour un réseau cellulaire de télécommunications (10), dans lequel un noeud principal de répartition (20) reçoit une unique base de temps d'une source (24) fiable telle qu'un terminal GPS et la retransmet à plusieurs noeuds secondaires (22a-22c) du système cellulaire via le réseau de signalisation (14) du réseau de télécommunications. Au reçu de la base de temps, les noeuds secondaires peuvent synchroniser leurs propres horloges internes (23a-23c), ce qui évite les dérives de temps entre noeuds collaborant. La séquence de synchronisation peut être commandée manuellement ou automatiquement depuis le noeud principal ou les noeuds secondaires.
PCT/SE2000/000194 1999-02-26 2000-02-01 Signaux horodateurs utilisant les canaux communs de signalisation dans un reseau cellulaire de telecommunications WO2000051366A2 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CA002364785A CA2364785A1 (fr) 1999-02-26 2000-02-01 Signaux horodateurs utilisant les canaux communs de signalisation dans un reseau cellulaire de telecommunications
JP2000601856A JP2002538688A (ja) 1999-02-26 2000-02-01 セルラー電気通信ネットワークの共通チャネル信号を使用する時間管理
EP00915621A EP1157485A2 (fr) 1999-02-26 2000-02-01 Signaux horodateurs utilisant les canaux communs de signalisation dans un reseau cellulaire de telecommunications
AU36851/00A AU3685100A (en) 1999-02-26 2000-02-01 Time management using common channel signalling in a cellular telecommunication network

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US25910699A 1999-02-26 1999-02-26
US09/259,106 1999-02-26

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WO2000051366A2 true WO2000051366A2 (fr) 2000-08-31
WO2000051366A3 WO2000051366A3 (fr) 2000-12-07

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JP (1) JP2002538688A (fr)
CN (1) CN1354925A (fr)
AU (1) AU3685100A (fr)
CA (1) CA2364785A1 (fr)
WO (1) WO2000051366A2 (fr)

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EP1630979A1 (fr) * 2004-08-25 2006-03-01 Siemens Aktiengesellschaft Procédé et système pour la mise à jour des horloges dans des composants d'un réseau de communications
EP1802013A1 (fr) * 2005-12-20 2007-06-27 NTT DoCoMo, Inc. Procédé pour la synchronisation des noeuds d'un réseau, réseau et noeud correspondant
CN100350763C (zh) * 2004-01-02 2007-11-21 上海欣泰通信技术有限公司 应用于电信网的时间供给与同步系统
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JP2012510226A (ja) * 2008-11-25 2012-04-26 アルカテル−ルーセント プロキシＭＩＰｖ６プロトコルを使用したネットワーク内で移動装置の移動性を管理する方法
DE10128927B4 (de) * 2001-06-15 2013-10-17 Deutsche Telekom Ag Verfahren zur Ermittlung der Uhrzeit in zumindest zwei miteinander zusammenwirkenden Messrechnern
US8717894B2 (en) 2008-07-03 2014-05-06 Zte Corporation Synchronization, scheduling, network management and frequency assignment method of a layered wireless access system
WO2015047986A1 (fr) * 2013-09-30 2015-04-02 Qualcomm Incorporated Synchronisation de grande précision pour un réseau dans un système de localisation de position dans des immeubles

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CN101694569A (zh) * 2009-10-21 2010-04-14 中兴通讯股份有限公司 时间同步的实现方法及装置
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WO2000051366A3 (fr) 2000-12-07
CN1354925A (zh) 2002-06-19

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