CN1731703A - Time synchronization method in third-generation mobile communication system - Google Patents
Time synchronization method in third-generation mobile communication system Download PDFInfo
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- CN1731703A CN1731703A CN 200410051021 CN200410051021A CN1731703A CN 1731703 A CN1731703 A CN 1731703A CN 200410051021 CN200410051021 CN 200410051021 CN 200410051021 A CN200410051021 A CN 200410051021A CN 1731703 A CN1731703 A CN 1731703A
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Abstract
The invention discloses a time synchronism method for the third general mobile communication system which comprises steps of: establishing NTP server as reference time server in system; providing time services to other node devices or net unit devices with requirement of time synchronism and setting the net unit devices or node devices to time synchronism mode. Each node device or net unit device in system network sets its NTP server, IP address and ports with allocation management and gets time synchronism service from NTP server.
Description
Technical field
The present invention relates to time synchronization problem in the mobile communcations system, relate in particular in Wideband Code Division Multiple Access (WCDMA) (WCDMA) system, TD-SCDMA communication system and the CDMA2000 system between the network element, the method for time synchronized between network element and the Element management system and between other network nodes.
Background technology
Along with development of wireless communication devices, communication network becomes increasingly complex and is huge, further how each node in the network is obtained correct time and has increased difficulty.Correct time information has great function for the business that network provided in the third generation mobile network.Main time synchronized demand is from several aspects:
1) alarm of network management system and daily record need the correct time of accurate recording incident and alarm, so that carry out fault and performance evaluation.For example, the generation alarm time of network management center or Element management system record, it may not the actual correct time that produces alarm of network element, the Intelligent treatment that may bring alarm correlation to handle and alarm after taking place is like this made mistakes, because the inaccurate meeting of time value causes the dislocation that occurs in sequence of these processing.In addition, when network management center adopts the multiple spot log record,, the confusion of log record will be caused if each node time of network is asynchronous.If need these information quick and precisely to carry out fault location, correct time is absolutely necessary.
2) the CDMA2000 base station needs UTC (Coordinated Universal Time(UTC)) information to rely on the synchronous cdma system of GPS (global positioning system) satellite time, time synchronized between the base station is designated as benchmark during all with public CDMA, this markers is synchronized with the UTC time by receiving GPS regularly.BTS (base transceiver station) needs absolute time to obtain the CDMA signal that sends from MS (travelling carriage).In soft handover, may E-mail instructions take place in selector do not match, this is owing to BTS message pathway queue delay causes.For preventing this not matching, all BTS and BSC (base station controller) must time synchronized.
3) the time synchronized charge system that is used for communication network can reduce the mistake of charge information, for the inter-network settlement of different operators provides reliable basis because appearance and the existence of rate at times of multi-operator, the situation that exists the inconsistent ticket that causes that charges between net to lose.Adopt time synchronized to improve and to address this problem.Such as, when telecommunications and UNICOM's intercommunication, be to charge by gateway exchange, if telecommunications side charging starting point is 20:58 (half the fee is before the period), and UNICOM's side charging starting point is 21:01 (half the fee is after the period), then error can appear in telecommunications, UNICOM's charging bill, and common way is to abandon ticket, and losing by both party, operator bears.If absolute time accurately on both sides' switch, then both sides' charging error can be controlled at Millisecond, fundamentally avoids ticket difference.Even have only a side equipment can with obtain accurate absolute time, in the ticket decision-making, this can occupy the ruling status, for the other side eliminates loss.
Therefore still the time synchronizing method between each node in the undefined system among the international norm 3gpp of third generation wireless communication networks and the 3gpp2 may cause between RNC (radio network controller) and NodB, the situation generation in asynchronism(-nization) step between different NodeB, between BTS and the BSC and between other network nodes or between network element and the Element management system network management system.For the time synchronization process in the network, proposed in the domestic industry standard to be undertaken synchronously by the mode of SNTP and Network Time Protocol, but the hierarchical structure of concrete time service and the requirement of each network element do not made unified explanation still needs to carry out communication work outside a large amount of standards and could guarantee that the time synchronized of SNTP or NTP can normally carry out in the process of implementing.
Though the part base station equipment may carry GPS, and on Internet, there are a large amount of precise time servers that the time service can be provided.But on the cell localization synchronously still of wireless messages the scheme of using outside the GPS is arranged all, system does not also require that the base station must have the GPS receiving equipment, can not expect that therefore base station equipment necessarily can obtain precise time by GPS.And lack IP tunnel between the base station equipment, especially stride between NodeB, the BTS of manufacturer, NodeB to RNC, BTS to RNC, NodeB is to not providing NTP service mutually based on IP tunnel substantially between the BSC.And NodeB, BTS, RNC, the building environment at the equipment place of BSC and CN (core net) side generally all separates with Internet, and the ability that should not provide equipment directly can be visited by Internet for the consideration of safety, because temporal information can influence the benchmark of charging and may influence the data service of online auction equal time sensitiveness, therefore between the local area network (LAN) at equipment place and Internet, also generally have fire compartment wall and isolate the message of 123 ports and avoid undelegated time server on the Internet to come system time information on the direct malicious modification equipment.Even if can open 123 ports, the authentication mechanism by NTP guarantees fail safe then, if but fully by equipment directly and the time server on the Internet finish voluntarily synchronously, the key management of large number quipments also can form new management predicament.And the NTPServer on the Internet is NTP V3 and NTP V4 coexistence, the private key mechanism of symmetric key is used in NTP V3 key management, encrypt and adopt the DES algorithm, and NTP V4 adopts PKI mechanism, encrypt and adopt the MD5 algorithm, this difference has further been aggravated the complexity and the workload of key management.Therefore still need a kind of mechanism to guarantee normally finishing of time synchronized.
Summary of the invention
The technical problem that the present invention solves provides the method for synchronizing time in a kind of third generation mobile system, and the equipment such as each node RN of WCDMA/TD-SCDMA/CDMA2000 internal system C, NodeB that effectively solve obtain precise time value and synchronous problem of retention time.
In order to reach above purpose, the present invention adopts following technical scheme:
Set up ntp server as intrasystem reference time server, to the node device of other free synchronisation requirement or network element device provides the time service and with grid in each node device or network element device be made as configurable time synchronizing method.
Each node device or network element device are set the IP address and the port numbers of the ntp server that it relies on by configuration management in the grid, obtain the time synchronized service from ntp server.
This method for synchronous may further comprise the steps:
Step 1 is set up ntp server as intrasystem reference time server, configuration NTP time synchronized parameter;
Step 4, node device or network element device are initiatively to ntp server query time information in the system;
Ntp server one of can be as follows obtains precise time in the said method:
1) atomic clock or GPS receiver device are installed in the IP network at ntp server place, ntp server obtains precise time from atomic clock or GPS receiver;
2) provide precise time by the base station equipment that has the GPS receiving system in the system;
3) go up specified web by Internet the time service is provided.When having a plurality of precise times source in the grid, ntp server adopts time source filtration, the choice mechanism of NTP to select the precise time source.
If carried the GPS receiving system on the base station equipment, can't help that ntp server carries out time synchronized in the system.
Adopt the inventive method, can reach following beneficial effect:
1.3G total system network element and time synchronized are configurable, for the requirement of equipment be the open hour synchronous interface is set, operator can very easily finish whole Time Synchronization Network configuration of internal system and operation.
2. the unification of the time synchronization protocol between 3G internal system network element, the charge system is Network Time Protocol, and ntp server can provide the time service by the equipment of free synchronisation requirement in grid, when if NTP Server (ntp server) is provided on certain equipment, it can provide NTP service to the equipment of other manufacturers, can strengthen multi-vendor interconnected convenience.
3. General N TP Server needs independent purchase of equipment, if each equipment commercial city need provide independent time server to operator, obviously can increase cost of investment, this method emphasizes that multi-vendor NTPServer's is interconnected, can bear this function by the equipment that possesses ability to communicate and NTP service ability in operator's appointing system, realize that the multi-vendor equipment of NTP service is shared.
4. further segment the key management of time synchronization network in the 3G system, can not open authentication functions, only need to guarantee safety with outside the connection by authentication mechanism at NTP Server in internal system.
Description of drawings
Fig. 1 is the time source and the time server disposition figure of the inventive method;
Fig. 2 is the flow chart of the inventive method.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further details.
Fig. 1 is a structure chart of the present invention, and scheme of the present invention can be applied in the third generation mobile system, mainly based on following prerequisite: the one, can obtain precise time information by NTP Server; The 2nd, there is direct Ethernet to connect between the equipment at NTP Server place and other equipment such as RNC, NodeB, the BTS etc. or IPOA (IPOver ATM) connects.
Set up NTP Server as intrasystem reference time server, to the node device of other free synchronisation requirement or network element device provides the time service and with grid in each node device or network element device be made as configurable time synchronizing method.
Time server can be to provide by independent hardware device, also can be that the load time server software provides on certain computer in system's machine room, for example often can on the computer of deployment facility OMC-R (base station sub-system operation maintenance center), provide by the mode that loads NTP Server software.
Parameters such as the working method of NTP Server, time source are provided with can be finished by independent configuration, also can NTP Server abstract be a management object and by OMC (operation maintenance center) integrated management.When certain manufacturer when equipment provides NTP server, the service that the equipment of other manufacturers can directly use this NTP Server to provide by the network element device NTP service parameter that disposes oneself.
If on the base station equipment of WCDMA, TD-SCDMA or CDMA2000, carried the GPS interface arrangement, can think that they can obtain point-device absolute time by the UTC interface of GSP, though may on the absolute time value, still may there are differences with the NTPServer of internal system, but can think that deviation is very little, therefore can not influence normally providing of above-mentioned three time synchronized demands, can can't help to these equipment that NTP Server carries out synchronously in the system.
Obtain the precise time method at intrasystem NTP Server and can adopt a kind of realization the in several modes of the following stated: can equipment such as atomic clock or GPS receiver be installed in the IP network at NTP Server place, NTP server obtains precise time from these equipment; Can provide precise time by the base station equipment that has the GPS receiving system such as BTS, NodeB, NTP Server can utilize IPOA passage or direct IP tunnel between OMC and NodeB, the BTS to obtain precise time then; Can go up specified web by Internet the time service is provided, only allow the computer at time server place to serve by the fire compartment wall acquisition time;
When having a plurality of possible precise time source in the grid, NTP Server adopts that the time source of NTP filters, choice mechanism is selected the precise time source.
Set IP address and the port numbers of the NTP Server that it relies on as the equipment such as RNC, NodeB of each node in the grid by configuration management, obtain the time synchronized service by direct IP tunnel or IPOA passage.
If between NTP Server and precise time source, also adopt Network Time Protocol, must open authentication mechanism and guarantee that the fail safe of temporal information specifically adopts the mechanism of NTP V3 or NTP V4 can, in view of NTP V4 does not also have last issue and replaces the mechanism that NTP V3 is adopted in NTP V3 suggestion present stage unification, the version of the unified NTP of upgrading Server adopts NTP V4 to utilize its superiority such as support to IPV6 when NTP V4 thoroughly replaces NTP V3 in RFC after.And at NTP Server with use and can not open authentication mechanism between the equipment of time service of NTP Server, to simplify the complexity of authentication information management.
Fig. 2 is the flow chart of the inventive method.
Step 1, configuration interface by OMC is provided with time NTP parameter, parameter item comprises: obtain the mode (having 2 kinds of modes promptly can obtain precise time or obtain by certain network element on the internal network by Internet in the present embodiment) of precise time, if also comprise that from Internet acquisition time information key, port mapping and NTP Server provide the port numbers of time synchronized to other equipment by fire compartment wall;
Step 7, RNC and NodeB equipment are according to replying the adjustment time.
Should be understood that; for those of ordinary skills; can be equal to change or replacement by technical conceive according to the present invention, and all this change of extra creative work or protection ranges that alternative all should belong to claims of the present invention of need not.
Claims (9)
1. method for synchronizing time in the third generation mobile system, it is characterized in that setting up ntp server as intrasystem reference time server, to the node device of other free synchronisation requirement or network element device provides the time service and with grid in each node device or network element device be made as configurable time synchronizing method.
2. method for synchronizing time in a kind of third generation mobile as claimed in claim 2 system, it is characterized in that each node device in the grid or network element device set the IP address and the port numbers of the ntp server that it relies on by configuration management, obtain the time synchronized service from ntp server.
3. method for synchronizing time in the third generation mobile system may further comprise the steps:
Step 1 is set up ntp server as intrasystem reference time server, configuration NTP time synchronized parameter;
Step 2, start-up time server;
Step 3, time server obtains precise time;
Step 4, node device or network element device are initiatively to ntp server query time information in the system;
Step 5, ntp server are made the time inquiry and being replied;
Step 6, node device or network element device are synchronous according to replying the deadline in the system.
4. as method for synchronizing time in claim 1 or the 2 or 3 described a kind of third generation mobile systems, it is characterized in that described ntp server one of can be as follows obtains precise time:
1) atomic clock or GPS receiver device are installed in the IP network at ntp server place, ntp server obtains precise time from atomic clock or GPS receiver;
2) provide precise time by the base station equipment that has the GPS receiving system in the system;
3) go up specified web by Internet the time service is provided.
5. method for synchronizing time in a kind of third generation mobile as claimed in claim 4 system is characterized in that when having a plurality of precise times source in the grid, and ntp server adopts that the time source of NTP filters, choice mechanism is selected the precise time source.
6. as method for synchronizing time in claim 1 or the 2 or 3 described a kind of third generation mobile systems,, can't help that ntp server carries out time synchronized in the system if it is characterized in that having carried the GPS receiving system on the base station equipment.
7. as method for synchronizing time in claim 1 or the 2 or 3 described a kind of third generation mobile systems, the time synchronized parameter that it is characterized in that ntp server can be finished by independent configuration, perhaps ntp server abstract be a management object and by operation maintenance center integrated management.
8. method for synchronizing time in a kind of third generation mobile as claimed in claim 7 system is characterized in that described configuration parameter should comprise the mode of obtaining precise time at least; If comprise also that from Internet acquisition time information key, port mapping and ntp server provide the port numbers of time synchronized to other equipment by fire compartment wall.
9. as method for synchronizing time in claim 1 or the 2 or 3 described a kind of third generation mobile systems, it is characterized in that described ntp server is that the load time server software is realized on independent hardware device or certain computer in system.
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| CN 200410051021 CN1731703A (en) | 2004-08-05 | 2004-08-05 | Time synchronization method in third-generation mobile communication system |
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| CN 200410051021 CN1731703A (en) | 2004-08-05 | 2004-08-05 | Time synchronization method in third-generation mobile communication system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101150573B (en) * | 2006-09-18 | 2010-12-29 | 中兴通讯股份有限公司 | A selection method for NTP time server |
| CN102013969A (en) * | 2010-12-02 | 2011-04-13 | 中兴通讯股份有限公司 | Method and device for realizing time synchronization |
| CN101202657B (en) * | 2006-12-15 | 2011-06-22 | 中兴通讯股份有限公司 | Method and apparatus for system maintenance |
| CN103220774A (en) * | 2013-02-27 | 2013-07-24 | 重庆邮电大学 | Precise timing method and precise timing system with assistance of cellular network |
| CN104349450A (en) * | 2013-07-30 | 2015-02-11 | 上海贝尔股份有限公司 | A method and apparatus for clock synchronizing |
| CN110492963A (en) * | 2019-08-30 | 2019-11-22 | 湘电风能有限公司 | A kind of wind power plant time synchronization system |
| CN114070849A (en) * | 2021-11-15 | 2022-02-18 | 上海通联金融服务有限公司 | Method and system for centralized management and control of subsystem service date |
-
2004
- 2004-08-05 CN CN 200410051021 patent/CN1731703A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101150573B (en) * | 2006-09-18 | 2010-12-29 | 中兴通讯股份有限公司 | A selection method for NTP time server |
| CN101202657B (en) * | 2006-12-15 | 2011-06-22 | 中兴通讯股份有限公司 | Method and apparatus for system maintenance |
| CN102013969A (en) * | 2010-12-02 | 2011-04-13 | 中兴通讯股份有限公司 | Method and device for realizing time synchronization |
| CN102013969B (en) * | 2010-12-02 | 2015-06-03 | 中兴通讯股份有限公司 | Method and device for realizing time synchronization |
| CN103220774A (en) * | 2013-02-27 | 2013-07-24 | 重庆邮电大学 | Precise timing method and precise timing system with assistance of cellular network |
| CN103220774B (en) * | 2013-02-27 | 2016-07-06 | 重庆邮电大学 | A kind of method and system carrying out accurate time transmission by Cellular Networks |
| CN104349450A (en) * | 2013-07-30 | 2015-02-11 | 上海贝尔股份有限公司 | A method and apparatus for clock synchronizing |
| CN110492963A (en) * | 2019-08-30 | 2019-11-22 | 湘电风能有限公司 | A kind of wind power plant time synchronization system |
| CN114070849A (en) * | 2021-11-15 | 2022-02-18 | 上海通联金融服务有限公司 | Method and system for centralized management and control of subsystem service date |
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Open date: 20060208 |