CN1354925A - Time management using common channel signalling in cellular telecommunication network - Google Patents
Time management using common channel signalling in cellular telecommunication network Download PDFInfo
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- CN1354925A CN1354925A CN 00806306 CN00806306A CN1354925A CN 1354925 A CN1354925 A CN 1354925A CN 00806306 CN00806306 CN 00806306 CN 00806306 A CN00806306 A CN 00806306A CN 1354925 A CN1354925 A CN 1354925A
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- 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
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- 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
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- 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
Abstract
A time stamp distribution system and corresponding method for a cellular telecommunication network(10), wherein a time distributing master node(20)receives a unique time stamp value from a reliable time source(24), such as a GPS terminal device, and forwards this time stamp value to a plurality of time slave nodes(22a-22c)of the cellular telecommunication system, through the signalling network(14)of the cellular telecommunication network. Upon receipt of the time stamp value, the time slaves nodes can synchronise their own internal clocks(23a-23c), so that time drifts between co-operating cellular nodes are avoided. The time synchronisation sequence can be either manually or automatically initiated from both the master node side and the slave node side.
Description
Background of invention
Invention field
The present invention is relevant with cellular communication, particularly relates to the technology of utilizing signaling channel transmitting time stab value (time stamp value) to come synchronous each node of Cellular Networks.
Prior art
A cellular communications network comprises the cellular system that some are different, each respectively comprises node and other nodes such as mobile services switching centre (MSC), one or more homing user position register (HLR), some calling party location registers (VLR) that some are different by operation side's operation.Usually, these nodes are made of some hardware devices that move various software programs, so that carry out some specific operations, make cellular system provide desired cellular service for the user.
In such cellular communications network, a critical problem is to hold the precise time value.Some basic business in cellular communication environment are such as billing, regularly safeguard, the activation and deactivation of the software upgrading of the program of each node operation, featured function, all will use the time stamp value.In addition, in order to ensure the consistency between the database of the different nodes of same cellular system, the time synchronized in the cellular communications network between each node also is crucial.Such database all has and billing, the relevant critical information of great network event (such as the network congestion time).For example, have a calling often and in a service area with one the one MSC, initiate, finish and have to another in the service area of one the 2nd MSC.Under the increasing situation of the mobility of increasing cellular telephone subscribers, the time synchronized between these two MSC is very crucial for producing the accurate billing record of making peace.The node that other direct supporting cellulars are called out such as operations support systems (OSS) node, also needs the precise time value to write down the correct time that warning occurs.
Describe the part of the cellular communications network 10 known to there is shown in the prior art below with reference to Fig. 1.Or rather, Fig. 1 can regard the part of cellular communications network 10 as, or by the part of a cellular communication system of single honeycomb operation side operation.The present invention includes both of these case, Fig. 1 shows four cellular node 16a to 16d, and these nodes are by main line and signaling network 12 mutual communication.As described, the situation of prior art shown in Figure 1 is applicable to Cellular Networks and cellular system, because time source all is local foundation separately for their each node.According to the situation of this network, each cellular node 16a to 16d receives one from separate local time source 18a to 18d at regular intervals separately and has the independent time stamp value that produces.Under such condition, the time drift between the used local time source 18a to 18d of each node 16a to 16d will influence the time value that sends to these nodes.As a result, these time drifts have strengthened the error that adopts each self-clock to occur owing to each node, have sizable time inconsistent between these nodes thereby make, even can differ a few minutes.In addition, the prior art solutions expense that implements also is very big, because must realize multiple time source in this communication network, each node that is necessary for network is set up and maintenance application program separately.
This situation is unaccommodated fully for cellular communications network 10, and for requiring time synchronized between the node to be accurate to 1 second the node of these synthetic operations of cellular system 11 especially like this.Current situation is the error that produces a few minutes sometimes in billing record, warning mark record and other application relevant closely with the time.
Preferably there is a time source accurate time stamp value can be sent to some nodes in the Cellular Networks, perhaps send to all nodes of a cellular system at least, make all nodes can periodically make their clock 23i synchronous, prevent time drift.If this measure can utilize existing cellular communications network to realize that is just more favourable, enable an extra charge that new transmission network is required just can save like this to install.
Summary of the invention
Therefore, catalogue of the present invention provide a kind of method, can utilize in the cellular communications network usually available existing signaling network that the time stamp value is distributed to each node of cellular communications network, perhaps be distributed to a plurality of nodes of cellular communication system at least, make the node as much as possible can be in time synchronous.According to method of the present invention, other nodes by a signaling network and network of a first node of Cellular Networks (hereinafter referred to as first node or time issue host node) (hereinafter referred to as Section Point or time from node) communicate by letter, on request from one for example the such reliable time source of global positioning system (GPS) terminal equipment receive accurate time stamp value, the person in charge's time such as mobile services switching centre, homing user position register, calling party location register of being distributed to is from node.According to the preferred embodiments of the present invention, time issue host node is an operations support systems (OSS) or mobile services switching centre (MSC) preferably.Yet the time synchronized dedicated node of other cellular node and Cellular Networks also can be born this responsibility.After receiving the time stamp value, these times proofread and correct the time drift of their clock from node, that is to say according to the time stamp value that receives their clock synchronously, make their clock phase mutually synchronization.The transmitting time stab value is undertaken by can obtain signaling network on the spot in cellular communication system, can be for example a signaling system 7 (SS7) or Common Channel Signaling.Because these two kinds of signaling networks are the most general in Cellular Networks, so applicant will describe according to the CCS/SS7 signaling network in this application.Yet, be appreciated that the present invention also can be used for the signaling network of other types.
Issue time stamp value is carried out synchronous program and can be issued host node or started when the fixed particular event of honeycomb operation square gauge occurring from one of node by the time by the time.The program of issue time stamp value or its qualifying part also can artificially be started by the network manager.
For example, according to a preferred embodiment of the present invention, synchronization program can by from node one detect need carry out time adjustment from node (for example restart the back or the electricity went off one section may have influence on the time after the time of the internal clock of node) start.In this case, the time is sent the signal of time synchronized request by the CCS/SS7 signaling channel to time issue host node from node, and host node transfers to the time from node by same CCS/SS7 signaling channel after obtaining accurate time stamp value from the time stamp source.
Therefore, the purpose of this invention is to provide a kind of method, can be with the clock of at least one node of the synchronous cellular communications network of time stamp value, this method comprises the following steps:
A) send described time stamp value from a time source at least one first node, described time source is communicated by letter with described at least one first node by a communication link;
B) signaling network by described cellular communications network sends described time stamp value from described at least one first node at least one Section Point of described cellular communications network; And
C) described at least one Section Point one is received described time stamp value, with regard to the clock with the synchronous described Section Point of described time stamp value.
Another object of the present invention provides a kind of cellular communications network, and this cellular communications network comprises:
A time source that produces the time stamp value;
At least one receives the first node of described time stamp value by a communication link; And
One connects a plurality of Section Points of described cellular communications network and the signaling network of described first node, at least one Section Point in described a plurality of Section Point receives described time stamp value by described signaling network from described first node, and described at least one Section Point in described a plurality of Section Points is once receiving the synchronous clock separately of described time stamp value.
Another purpose of the present invention provides a kind of cellular communications network, and this cellular communications network comprises:
A time source that produces the time stamp value;
A plurality of respectively have the time of an inner time stamp value from node;
One connect described cellular communications network comprise the signaling network of described time from a plurality of nodes of node; And
At least one monitors the time issue host node of described a plurality of time at least one time from node from the described inner time stamp value of node by described signaling network, described time issue host node comprises the checkout gear of detection described time at least one time from node from the time drift of the described inner time stamp value of node, the described checkout gear one of described time issue host node detects the described inner time stamp value of at least one described Section Point and drifts about if having time, the time host node just sends the time stamp value that from described time source receive to described at least one time from node by described signaling network, described at least one time from node once receiving that described time stamp value is with the synchronous clock separately of described time stamp value.
Brief Description Of Drawings
In order further to understand the present invention and other purposes of the present invention and advantage, can be with reference to the explanation of doing below in conjunction with accompanying drawing.In these accompanying drawings:
Fig. 1 shows each cellular node and obtains the used art methods of time stamp value respectively from local independent time source;
Fig. 2 shows the upper layer network figure of system of the present invention;
Fig. 3 is the signaling diagram of a preferred embodiment of the present invention, wherein shows the systime that starts by an incident occurring at time issue host node;
Fig. 4 is the signaling diagram of another preferred embodiment of the present invention, wherein shows the systime that starts from a node incident of appearance by in the time;
Fig. 5 is the signaling diagram of another preferred embodiment of the present invention, wherein show the host node Looking Out Time from node and detect a special time when node drifts about if having time start-up time synchronization program situation; And
Fig. 6 is for relating to the upper layer network figure of the preferred embodiment designed system of redundancy time issue host node according to of the present invention another.
DETAILED DESCRIPTION OF THE PREFERRED
Below with reference to Fig. 2 a preferred embodiment of the present invention is described.According to this embodiment, each node of cellular communications network 10, perhaps at least some node 22a to 22c of cellular communications network 10, the time stamp value (not shown Fig. 2) that produces from time issue host node 20 time of reception sources 24 by existing signaling network 14.Best, time source 24 is the unique time sources that unique time stamp value is provided for time issue host node 20.Yet other realization also is fine, and a pair of time issue host node is for example arranged, and comprises a basic host node and a redundant host node, and each is connected with a time source, so that redundant deposit to be provided.
Should be noted in the discussion above that term " time issue host node " (abbreviating " host node " as) and " time is from node " (abbreviating " from node " as) only is used to refer to the issue situation of time stamp value here, rather than refers to these cellular node conventional operation situations.Is well-known with regard to the relation of these cellular node of the management of calling out and foundation cellular communications network 10 and the situation of the operation that cooperatively interacts in this technical field, and this is not the problem that the application will discuss.
In addition, also noted earlier as the application, even the present invention can be used for the signaling network of any kind of, but will be that example describes as being used for the communication medium of time of implementation synchronization program with the CCS/SS7 signaling network in this application.Utilizing the signaling network transmitting time stab value of cellular communications network is one of key component of the present invention.
Can suppose that the present invention only is applicable to each independently cellular communication system,, that is to say that each company manages and safeguard separately system separately because each such system is by a specific cellular system operation side operation.Yet along with user's mobility constantly increases, the reciprocation between the cellular system is more and more frequent, and is just more and more transparent from a system roaming to another system.So the present invention is used for the whole continent or international cellular communications network 10, and to make the clocks that are distributed in the whole continent even global all cellular node become fully synchronously also be possible, and more and more useful.Therefore, it is contemplated that even use term " cellular communications network " in this application, but this is restrictive in no instance, the present invention also can be used to have only the part of network, for example independently a cellular communication system or its part.
In a preferred embodiment of the invention, host node 20 is an operations support systems (OSS) node preferably, and its major function is the operation of other nodes of supervision and managing cellular communication network 10.Though this is preferred implementation for the DMA cellular system of Ericsson, but host node 20 also can be a MSC or any other node of cellular communications network 10, and the CCS/SS7 signaling network 14 by cellular communications network 10 is connected on the cellular communications network 10.
According to this preferred embodiment of the present invention, respectively be connected on the CCS/SS7 signaling network 14 by corresponding signaling link 28a to 28d from node 22a to 22c.Signaling network 14 is a CCS/SS7 signaling network that is mainly used to set up with supervising connections for calling preferably.Time of concentration source 24 unique time source preferably such as the GPS terminal equipment, is used to provide point-device time stamp value.Host node 20 transfers to from node 22a to 22c by CCS/SS7 signaling network 14 after receiving this time stamp value by communication link 27 immediately.One receives the time stamp value, from node 22a to 22c each with the synchronous clock 23a to 23c separately of this time stamp value.By this operation, just fully synchronous from the internal clock 23a to 23c of node 22a to 23c.Therefore, all be eliminated, thereby each all operations of carrying out from node can get off with accurate with consistent time stamp value record now from the time drift of node.In this application, term " fully synchronously " be meant host node 20 with from the clock of node 22i mutually synchronization mutually in an acceptable error range, this acceptable error range is about 1/2nd seconds to one second in existing cellular communications network.Because one of main purpose of time synchronized is that the record abundant of bill and warning mark is made peace fully accurately, and these records all comprise a time stamp that is accurate to a second usually, can think enough so have the time synchronized of same precision (promptly being accurate to one second magnitude).
In this preferred embodiment of the present invention, be host node synchronization program 20 start-up time, as shown in Figure 3.Can start event programme to time synchronized in advance by the network work personnel, so that start this program.Such incident can be one period scheduled time (thereby time synchronized was just carried out once every the scheduled time), detect may cause one or more time drifts from node with network or from the relevant error of node, perhaps any other may influence or need the incident of time synchronized.In order to carry out these tasks, host node 20 can also comprise checkout gear 21, and is because 21 pairs of these preferred embodiments of the present invention of checkout gear are the concrete device with choosing, just shown in broken lines in Fig. 2.Checkout gear 21 for example can be some program modules of setting up, is used for monitoring and detecting described synchronous startup incident.Perhaps, checkout gear also can be some hardware modules that are used for detecting host node time synchronized incident 30, or any other thinks the device that is adapted at carrying out in the cellular communications network this measuring ability.This incident also can be those malfunctions of CCS/SS7 signaling network.It is contemplated that, the congested time drift that may cause each nodal clock, therefore after one network congestion period with the starting time synchronization program.
After checkout gear 21 detected this incident (operation 30), host node 20 was asked the time stamp values by a TIME REQUEST (time request) signal 32 to time source 24 immediately.One receives signal 32, and time source 24 is just by a Time Request response (time request response) signal 34 usefulness time stamp values response.So host node 20 just transfers to one first from node 22a by a TIME FORWARD (time passes on) message 36 with the time stamp value, from node 22a once receiving that this time stamp value is by operating its synchronous oneself internal clock 23a of 38 usefulness.Preferablely be, after finishing from node time synchronous 38, can send back to host node 20 with a Time ForwardAcknowledgement (time pass on affirmation) 40 responses from node 22a, the notice host node is operated successfully.Under opposite situation, host node 20 is learnt operation failure by same message 40, retransmits to from node 22a thereby read the time stamp value from time source 24 again.Yet,, the re-transmission situation is not shown for the ease of understanding to Fig. 3.Because being transferred to from the information of node is the time stamp value, therefore the delay of passing on is exactly critical.If host node 20 and can cause the delay of can not ignore with situation from the communication link between the node 22a to 22c, that is each just just new for node to one synchronously, and the time stamp value can be read from time source 24 by host node 20 again.Yet this is infrequent worst case, so, as shown in Figure 3, as long as it is just enough the desired synchronization accuracy in being provided at a common cellular system 10 to read a time stamp value from time source 24.In addition, in fact it is contemplated that, if the synchronous reasonable quantity from node 22i is carried out all delays of above-mentioned synchronization program just less than the synchronous margin of error of required time.
By 10 pairs of cellular communications networks all carry out same program from node subsequently, receive these time stamp values from same host node 20.
Be appreciated that what disclosed is preferred implementation of the present invention.Yet the present invention also can realize with different modification according to its spirit.For example, for the preferred embodiments of the present invention shown in Figure 3, being sent to respectively also can simultaneously or link up from the TIME FORWARD message of node 22i sends, so that postpone and more accurately carry out time synchronized between each cellular node having to reduce when node needs by same host node 20 synchronously in a large number.Since Time ForwardAcknowledgement message be not as TIME FORWARD message to the time requirement strictness, host node 20 can be waited for and receive these independent and Acknowledgement message of transmission in succession.
Below with reference to second preferred embodiment of the present invention shown in Fig. 4 explanation.According to this second preferred embodiment, be these from node 22i when detecting this time synchronized and start incident (operation 50) from node separately start-up time synchronous.As shown in the figure, this situation includes only one from node, is designated as 22a in Fig. 4.Starting incident synchronously from node time can be to detect from the internal clock 23a of node 22a noticeable time drift is arranged, follow system restoration (this may also just cause time drift) after outage a period of time, inferring between the clock (for example 23b) of internal clock 22a and other nodes may the life period drift, perhaps any other by network work personnel or administrative staff's regulation automatically or artificial incident of carrying out.As described in for host node, also can monitor the state of CCS/SS7 signaling network from node, start synchronization program at one section after may causing the congestion time of its clock time drift.Certainly, carried out, comprised checkout gear 25a from node 22a in order to make operation 50, because it is checkout gear 25i is with the concrete device that selects to this preferred embodiment of the present invention, just shown in broken lines in Fig. 2.Checkout gear 25i for example can be some by the software module that the network manager preestablishes, be used for monitoring and detect this time synchronized starting an incident 50 from node.For example, can work out an application program, be used for timing supervision and these incidents or predetermined probability of occurrence occur, and the triggered time be synchronous.Perhaps, as described in for host node checkout gear 21, also can be that some are to carry out hardware module or any other proper device that these desired tasks are set up from node detection device 25i.In a modification of this preferred embodiment, operation 50 can be the artificial incident that activates, for example incident of the manual activationary time synchronization program of network manager.Yet, can believe that the most frequent time synchronized startup incident that in fact may occur is the incident of recovery system behind one section congestion time.
From node detection when starting incident (operation 50) synchronously from node time, send a TIME SYNCHRONISATION REQUEST (time synchronized request) message 52 from node 22a to host node 20.Receive message 52, host node 20 is just asked the time stamp values by a TIME REQUEST (time request) message 32 to time source 24.After obtaining the time stamp value by a Time Request response (time request response) message 34, host node 20 transfers to it from node 22a by a TimeSynchronisation request response (time synchronized request response) message 54 immediately.Receive the time stamp value, from node 22a immediately with its synchronous internal clock 23a of oneself, if operate 38 successes, just return a TIMESYNCHRONISATION REQUEST ACKNOWLEDGEMENT (time synchronized request affirmation) 58, the success or failure of notice host node 20 operations to host node 20.If failure can repeat this synchronization program fully.Yet, can think that this worst case is rare, so not illustrate among Fig. 4.
According to the 3rd preferred embodiment of the present invention, the method that is provided is, each time value of host node 20 timing supervisions from the internal clock 23i of node 22i, checkout gear 21 (see figure 2)s one of host node 20 have detected noticeable time drift, for example greater than a predetermined threshold value, just specific synchronous from the node time of implementation to this.As shown in Figure 5, relevant with this preferred embodiment described synchronization program starts when detecting a host node time synchronized incident (operation 60).Host node time synchronized incident for example can be one period preset time cycle, or any other by network work personnel or administrative staff predefined incident in the checkout gear 21 of host node 20.Such incident also can be artificial active program incident.
One host node time synchronized incident (operation 60) occurs, and host node 20 just begins to monitor from node 22i.Fig. 5 only show 2 different from node 22a and 22b, but it is many from node 22i to be appreciated that host node 20 can monitor during same synchronization program.According to this 3rd preferred embodiment of the present invention, host node 20 is to sending a TIME MONITOR (time monitoring) message 62 from node 22a, to read the time value 63 from node 22a.Time value 63 returns to host node 20 by TimeMonitor response (time monitoring is replied) message 64.One receives from node time value 63, and host node obtains the time stamp value just to time source 24 request time stamp values by Time RequestResponse (time request response) message 34, as in this application before as described in.The time stamp value that obtains from time source 24 has been arranged and from node time value 63, host node 20 just can compare them by operating 66.Under present case, suppose the time stamp value with from the difference of node time stamp value 63 greater than a threshold value of predesignating.In this case, host node sends to the time stamp value from node 22a by TIME FORWARD (time passes on) message 36, receive time stamp value synchronous its internal clock 23a (operation 38) immediately from node 22a one, thereby eliminated the time drift that causes synchronization program start-up time.As previously described, clock synchronization operation one finishes, and just replys with a Time Forward Acknowledgement (time pass on affirmations) message 40 from node 22a, notifies host node 20 to operate 38 success or failure.If fail, can repeat the part of specific node 22a of relating to of synchronization program fully.
After node 22a time synchronized success, all the other that continue time value depends on same host node 20 are carried out from node synchronously.Same program is used for all the other from node, whenever next node.The difference of time stamp that provides from the time value 63 of node 22b and time source 24 situation less than the threshold value of predesignating is provided the remainder of Fig. 5.In this case, carried out evaluation 66a after because do not need to sending time stamp from node 22b, host node 20 just be through with to this specific node synchronously.
Should be noted in the discussion above that best host node 20 whenever to one specific when node is carried out this part synchronization program, read the time stamp value from time source 24 again.This can make moment of reading the time stamp value that may produce time stamp value error that the delay of identifying moment of 66 is reduced greatly.
Yet, in a modification of present embodiment, can not influence the required time synchronization accuracy if think these to postpone minimum, that so just may be more favourable: from time source 24 read-only time stamp values, monitor all relevant this machine time value 63i then from node 22i, specific synchronous to some more when needed from the node time of implementation.
Though the front all concentrates on the time synchronized of node 22i the explanation of these preferred embodiments, but be appreciated that, respectively can correct with synchronization program shown in foregoing corresponding Fig. 3 of first and second preferred embodiments of the present invention and 4 among the application, so as to comprise whenever read from time source 24 the situation of synchronization master 20 during time value.Really, host node 20 can be configured to whenever it from time source 24 read during the time stamp value it also by with synchronous its internal clock 23 of each similar operation of carrying out from node 22i 37 shown in Fig. 3 and 4.From node, can ask with the host node 20 of various execution modes of the present invention and straight-through time source 24 synchronous as for these.This can take regularly to carry out the synchronous form (this modification does not illustrate) of independence that only relates to host node 20 and time source 24, perhaps can be the part of a global synchronization program, host node 20 can be at also its clock of carrying out shown in Fig. 3 and 4 23 synchronously to from the clock 23i of node 22i synchronous the time during this period.The result of such synchronization program has with the synchronous internal clock of same time stamp value a plurality of nodes of cellular communications network 10, thereby has eliminated the time drift between the node of each synthetic operation.
According to another preferred embodiment of the present invention shown in Figure 6, reliable in order to ensure the time synchronization process height, host node 20 can be a basic host node 20a, and can have redundant, that is to say, in cellular communications network, can dispose the node that another is called redundant host node 20b, be used for when basic host node is unavailable (for example basic host node occur when congested or when the part that basic host node is connected with all the other cellular node of network is congested) the time of implementation synchronizing function.With regard to the host node 20 as illustrating previously in the application, redundant host node 20b is an OSS node preferably, also can be any other node of cellular communication system, for example MSC.According to this preferred embodiment of the present invention, redundant host node 20b can the basic host node 20a of timing supervision ruuning situation (preferably by same CCS/SS7 signaling network 14), and carry out to from the relevant fault of the time synchronized of node the time detecting with basic host node 20a impotentia, redundant host node 20b can replace basic host node to carry out these tasks immediately.Redundant host node 20b can be as shown in Figure 6 receives the time stamp values by communication link 27 from source 24 at the same time, also can be from any other time source that is connected with redundant host node 20b reception time stamp value.
In another preferred embodiment of the present invention, a kind of translation function is provided, be used for changing the time stamp value that each receives from node from the local time zone of node 22i according to each.This translation function can consider the time zone of the time zone of time source 24 and/or host node 20 and time source and/or host node and receive the time stamp value from the time difference between the time zone of node.
One of numerous advantages of the present invention have provided a kind of economy and the easy method that realizes, eliminate the time drift in the cellular communication system fully.Utilizing existing C CS/SS7 signaling network that center time stamp value is distributed to a plurality of nodes is that existing each node is had the vast improvement of the system of time source separately.
Though some preferred embodiments of method and system of the present invention have been described in shown in the drawings and the detailed description in front, but it is very clear, these embodiment that the present invention is not limited to be disclosed can carry out numerous adjustment, modification and replacement according to the spirit of the present invention of setting forth and stipulating as following claim.
Claims (22)
1. the method for the clock of at least one node of a relative synchronous cellular communications network of time stamp value, described method comprises the following steps:
A) send described time stamp value from a time source at least one first node, described time source is communicated by letter with described at least one first node by a communication link;
B) signaling network by described cellular communications network sends described time stamp value from described at least one first node at least one Section Point of described cellular communications network; And
C) described at least one Section Point one receives described time stamp value, with regard to the clock with the synchronous described Section Point of described time stamp value.
2. the method that in claim 1, is proposed, wherein said signaling network is a CCS/SS7 signaling network of described cellular communications network, described CCS/SS7 signaling network makes described at least one first node be connected with described at least one Section Point.
3. the method that is proposed in claim 2, described method also are included in before the step b) step with the clock of synchronous described at least one first node of described time stamp value.
4. the method that in claim 2, is proposed, wherein said at least one first node is a time issue host node, described at least one Section Point is that a plurality of times are from node, described host node is issued described time stamp value to described a plurality of times from node, each described time from node once receiving from the described time stamp value of described host node separately clock synchronously.
5. the method that in claim 2, is proposed, wherein said at least one first node comprises two time issue host nodes, first described host node is a basic host node, and second described host node is a redundant host node, described redundant host node when described basic host node is unavailable, carry out described basic host node with the time synchronized function associated.
6. the method that in claim 4, is proposed, wherein said step a) starts when described time issue host node one detects a synchronous startup incident, and described synchronous startup incident is by network manager's artificial regulation in advance.
7. the method that in claim 4, is proposed, described method also comprises:
Before step a), monitor the step of described a plurality of time from the inside time stamp value of node by described cellular communication system; And
Before step b), identify the step of described a plurality of time by described cellular communication system from the precision of the described inner time stamp value of node, when detecting described time stamp value that described a plurality of time receives from described time source relatively from the described inner time stamp value of one of node drift arranged with regard to execution in step c).
8. the method that in claim 4, is proposed, wherein said step a) started when node detection to a time synchronized starts incident in the time of described a plurality of times from node, and described incident is by network manager's artificial regulation in advance.
9. the method that in claim 8, is proposed, wherein in the time of described a plurality of times from node during from node detection to described synchronous startup incident, if described signaling network can not insert from node described a plurality of times described this time from node, described a plurality of time described this time from node just makes a time drift alarm set from node, the state of the described signaling network of timing supervision, once the idle condition setting up procedure that detects described signaling network a).
10. the method that in claim 4, is proposed, wherein said time issue host node is an operations support systems (OSS) node, described time source is a global positioning system (GPS) terminal equipment, described GPS terminal equipment is communicated by letter with described time issue host node by communication link, for described time issue host node provides described time stamp value.
11. the method that is proposed in claim 4, wherein said step a) is artificially started by the network manager.
12. a cellular communications network, described cellular communications network comprises:
A time source that produces the time stamp value;
At least one receives the first node of described time stamp value by a communication link; And
One connects a plurality of Section Points of described cellular communications network and the signaling network of described first node, at least one Section Point in described a plurality of Section Point receives described time stamp value by described signaling network from described first node, and described at least one Section Point in described a plurality of Section Points is once receiving the synchronous clock separately of described time stamp value.
13. as the cellular communications network that in claim 12, proposed, wherein said first node is a time issue host node, described a plurality of Section Points be a plurality of times from node, described host node is a plurality ofly issued described time stamp value from node to described.
14. as the cellular communications network that is proposed in claim 13, wherein said signaling network is a CCS/SS7 signaling network.
15. as the cellular communications network that in claim 13, is proposed, wherein said time issue host node comprises a basic host node and a redundant host node, described redundant host node when described basic host node is unavailable, carry out described basic host node with the time synchronized function associated.
16. as the cellular communications network that in claim 14, is proposed, wherein said time issue host node also comprises the checkout gear of synchronous startup incident detection time, described checkout gear one detects described time synchronized and starts incident, described time issue host node just reads the time stamp value from described time source, described a plurality of times at least one time from node that described CCS/SS7 signaling network by described cellular communications network sends to described cellular communications network with described time stamp value is from node, described a plurality of times described at least one time from node from node once receiving that described time stamp value is with described time stamp value separately clock synchronously.
17. as the cellular communications network that in claim 14, is proposed, wherein said a plurality of time at least one time from node also comprises the checkout gear of synchronous event detection time from node, described checkout gear one detects described time synchronized incident, described a plurality of time described at least one time from node just asks described host node to send described time stamp value from node, once the synchronous clock of receiving from time issue host node separately of described time stamp value.
18. a cellular communications network, described cellular communications network comprises:
A time source that produces the time stamp value;
A plurality of respectively have the time of an inner time stamp value from node;
One connect described cellular communications network comprise the signaling network of described time from a plurality of nodes of node; And
At least one monitors the time issue host node of described a plurality of time at least one time from node from the described inner time stamp value of node by described signaling network, described time issue host node comprises the checkout gear of detection described time at least one time from node from the time drift of the described inner time stamp value of node, when the described inner time stamp value that the described checkout gear one of described time issue host node detects at least one Section Point in the described Section Point is drifted about if having time, the time host node just sends the time stamp value that from described time source receive to described at least one time from node by described signaling network, described at least one time from node once receiving that described time stamp value is with the synchronous clock separately of described time stamp value.
19. the cellular communications network that is proposed in claim 18, wherein said signaling network are the CCS/SS7 signaling networks.
20. the cellular communications network that is proposed in claim 18, the supervision that wherein said host node is carried out is artificially started by the network manager.
21. the cellular communications network that in claim 18, is proposed, the supervision that wherein said time issue host node is carried out starts when the described checkout gear of described time issue host node detects a time synchronized startup incident automatically, and described startup incident is predesignated by the network manager.
22. the cellular communications network that in claim 18, is proposed, wherein said time issue host node from described time source once receiving synchronous its clock of described time stamp value.
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| US25910699A | 1999-02-26 | 1999-02-26 | |
| US09/259,106 | 1999-02-26 |
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| CN1354925A true CN1354925A (en) | 2002-06-19 |
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| EP (1) | EP1157485A2 (en) |
| JP (1) | JP2002538688A (en) |
| CN (1) | CN1354925A (en) |
| AU (1) | AU3685100A (en) |
| CA (1) | CA2364785A1 (en) |
| WO (1) | WO2000051366A2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010145307A1 (en) * | 2009-10-21 | 2010-12-23 | 中兴通讯股份有限公司 | Time synchronization realization method and device thereof |
| WO2022151993A1 (en) * | 2021-01-13 | 2022-07-21 | 华为技术有限公司 | Method, device and system for detecting time synchronization performance |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10128927B4 (en) * | 2001-06-15 | 2013-10-17 | Deutsche Telekom Ag | Method for determining the time in at least two interacting measuring computers |
| US7180915B2 (en) | 2001-12-21 | 2007-02-20 | Nokia Corporation | Apparatus, and an associated method, for facilitating synchronization in a wireless mesh network |
| DE602004027322D1 (en) * | 2003-01-31 | 2010-07-08 | Ntt Docomo Inc | transmission synchronization |
| JP3970803B2 (en) | 2003-05-20 | 2007-09-05 | 三菱電機株式会社 | Inter-node synchronization method, radio control server, and radio bearer server in a radio network system |
| CN100350763C (en) * | 2004-01-02 | 2007-11-21 | 上海欣泰通信技术有限公司 | Time supply and synchronizing system for telecommunication network |
| ATE418819T1 (en) * | 2004-08-25 | 2009-01-15 | Nokia Siemens Networks Gmbh | METHOD AND SYSTEM FOR UPDATING CLOCKS IN COMPONENTS OF A COMMUNICATIONS NETWORK |
| EP1802013B1 (en) * | 2005-12-20 | 2011-05-04 | NTT DoCoMo, Inc. | Synchronization method for network nodes, corresponding network and node thereof |
| CN101166184B (en) * | 2006-10-17 | 2011-03-30 | 华为技术有限公司 | Measurement method and device for NTP software time hardware |
| JP5335077B2 (en) * | 2008-07-03 | 2013-11-06 | ゼットティーイー コーポレーション | Synchronization, scheduling, network management and frequency allocation method for hierarchical radio access system |
| EP2190252B1 (en) | 2008-11-25 | 2013-09-18 | Alcatel Lucent | Method for managing mobility of a mobile device within a network using a proxy MIPv6 protocol |
| US9408172B2 (en) * | 2013-09-30 | 2016-08-02 | Qualcomm Incorporated | High precision network synchronization in an indoor position location system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4337463A (en) * | 1980-08-22 | 1982-06-29 | Control Data Corporation | Time synchronization master station and remote station system |
| US5727034A (en) * | 1995-07-26 | 1998-03-10 | Nokia Telecommunications Oy | Apparatus and method for synchronizing base sites individually in a communication system |
| FI104592B (en) * | 1996-07-19 | 2000-02-29 | Nokia Networks Oy | Maintenance of synchronization over a telecommunications network |
| US6373834B1 (en) * | 1997-12-19 | 2002-04-16 | Telefonaktiebolaget Lm Ericsson | Synchronization for cellular telecommunications network |
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2000
- 2000-02-01 CA CA002364785A patent/CA2364785A1/en not_active Abandoned
- 2000-02-01 EP EP00915621A patent/EP1157485A2/en not_active Withdrawn
- 2000-02-01 CN CN 00806306 patent/CN1354925A/en active Pending
- 2000-02-01 AU AU36851/00A patent/AU3685100A/en not_active Abandoned
- 2000-02-01 WO PCT/SE2000/000194 patent/WO2000051366A2/en not_active Application Discontinuation
- 2000-02-01 JP JP2000601856A patent/JP2002538688A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010145307A1 (en) * | 2009-10-21 | 2010-12-23 | 中兴通讯股份有限公司 | Time synchronization realization method and device thereof |
| WO2022151993A1 (en) * | 2021-01-13 | 2022-07-21 | 华为技术有限公司 | Method, device and system for detecting time synchronization performance |
Also Published As
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| EP1157485A2 (en) | 2001-11-28 |
| AU3685100A (en) | 2000-09-14 |
| WO2000051366A3 (en) | 2000-12-07 |
| CA2364785A1 (en) | 2000-08-31 |
| WO2000051366A2 (en) | 2000-08-31 |
| JP2002538688A (en) | 2002-11-12 |
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