CN1459940A - Method of time synchronization in broad band CDMA - Google Patents
Method of time synchronization in broad band CDMA Download PDFInfo
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- CN1459940A CN1459940A CN 02111846 CN02111846A CN1459940A CN 1459940 A CN1459940 A CN 1459940A CN 02111846 CN02111846 CN 02111846 CN 02111846 A CN02111846 A CN 02111846A CN 1459940 A CN1459940 A CN 1459940A
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Abstract
A time synchronizing method between nodes in WCDMA system includes setting up time synchronization parameters, starting SNTP service on time server, actively transmitting request information from wireless network controller or wireless network access node to the time server, choosing and judging the SNTP service mode, regularly broadcasting time information by time server for broadcast mode or regularly requesting time information from client to time server for point-to-point mode to obtain time information, and removing transmission delay to complete time synchronization.
Description
Technical field:
The present invention relates to the method for time synchronized in Wideband Code Division Multiple Access (WCDMA) (WCDMA) cell mobile communication systems, relate in particular to radio network controller (RNC) and the precise time value acquisition of wireless network access point (NodeB) and the technical problem of time synchronized in the universal land radio access web (UTRAN).
Background technology:
Correct time information has a very important role for the business that network provided in the network, along with development of wireless communication devices, communication network becomes increasingly complex and is huge, how each node in the network is obtained correct time also brought very big difficulty.Third generation wireless communication networks time synchronizing method between each node in the still undefined system in Wideband Code Division Multiple Access (WCDMA) (WCDMA) cell mobile communication systems, therefore may cause between RNC and NodB, between different NodeB and the situation that the time can not be synchronous between other network nodes take place.For the time synchronization process in the network, can be with reference to UDP/TIME agreement (RFC868) and NTP (Network Time Protocol) Network Time Protocol (RFC1305) and SNTP SNTP agreement (RFC1769) realization.But UDP/TIME agreement wherein only requires server end to intercept the TCP37 port, after this port is set up the connection of this port, return the time value of a 32bit integer in client, represent meter numerical value second that on January 1st, 1900 rose in 0: 0: 0 to client.Such mode is not considered the transmission delay of network, produce and when the network composition is comparatively complicated, may have the transmission delay of can not ignore, and only provide 32bit not have symbol binary system counting second to client, probably precision can't meet the demands in present some used.Though the precision of Network Time Protocol and can meet the demands to the processing of transmission delay, but its agreement is comparatively complicated, and a field in message structure requires to provide des encryption, deciphering to make purview certification as the broadcast to server, cause the complexity that realizes bigger like this, not too suitable this occasion that is used for.And the system of SNTP, mechanism relatively are suitable for the purposes that the WCDMA internal system is carried out time synchronized.
Summary of the invention:
The technical problem to be solved in the present invention is to provide a kind of WCDMA internal system to carry out the method for time synchronized, use this method can make each node radio network controller (RNC) of WCDMA internal system and wireless network access point (NodeB) etc. can obtain the precise time value and the retention time synchronous.
For solving the problems of the technologies described above, the invention provides implementation method based on the network time synchronization of SNTP agreement, comprising:
Step 1, the configuration interface by operation maintenance center are provided with the time synchronized parameter;
Simple network timing agreement SNTP service on step 2, the start-up time server;
Step 3, initiatively send a request message to time server as the radio network controller (RNC) of client, wireless network access point NodeB, acquisition time information is also estimated the Network Transmission time-delay;
Because the present invention carries out the measuring and calculating of transmission delay and obtaining or broadcasting process of precise time value by OMC of operation maintenance center and RNS by the standard agreement according to SNTP, thereby but in the WCDM communication system each node can obtain precise time and the retention time synchronous.Therefore, the present invention can solve the problem of the time synchronized of each internodal NodeB in Wideband Code Division Multiple Access (WCDMA) (WCDMA) cell mobile communication systems.
Description of drawings:
Fig. 1 is the embodiment flow chart of the inventive method;
Fig. 2 is the configuration information data packet format that the present invention adopts.
Embodiment:
The present invention is described in further detail below in conjunction with accompanying drawing.
Scheme of the present invention is mainly based on following prerequisite: the one, can obtain precise time information by the OMC of operation maintenance center (or RNC); The 2nd, there is direct Ethernet to connect between the OMC of operation maintenance center and radio network controller (RNC), the NodeB or IPOA connects, radio network controller (RNC) and NodeB have the IPOA passage;
The OMC of operation maintenance center with the WCDMA system provides time service centre's function, realizes the server of SNTP.It supports broadcast mode and Unicast (the point-to-point interacting message that carries out of server and client) mode to support point-to-multipoint and point-to-point application requirements situation simultaneously.
The client who realizes SNTP on RNC, the NodeB as each node in the WCDMA grid can initiatively require the acquisition time value by the Unicast mode, also can come the acquisition time value by the broadcasting of accepting server, carries out synchronously.
For the WCDMA network, can be presented as a tree-like structure, and time synchronized can adopt equally multistage mode to carry out.Provide initial time by a root node, next node layer with this root node as server, server end is intercepted the request of downstream site on designated port, and make and replying, or according to the mode of operation client fixed time broadcast temporal information on leaf node that disposes, promptly root node provides the temporal information service with broadcast mode or Unicast mode to leaf node.Lower level node can be re-used as more, and the time server of the node of lower floor provides temporal information.Carry out synchronously for multistage mode,, provide initial temporal information by the root node of OMC as tree.RNC generally can be used as the manager of a subnet (Access Network) in the network of WCDAM, administers a collection of NodeB, and like this for the time synchronized service, RNC can be used as the root node of subtree of the NodeB of administration, and the time service is provided.
RNC also can be used as the SNTP server of this subnet inside as the manager of subnet, accepts to come from the request of the acquisition time of the NodeB that has the IPOA connection under its administration, with it; Under the situation that has realized LANE, also can carry out temporal information broadcasting to these NodeB.
The SNTP agreement is followed in strictness on concrete implementation.Need all to intercept default UDP time serve port (123 port) as the OMC and the RNC of SNTP server; Support Broadcast mode and the Unieast mode of SNTP simultaneously; Wherein the Unicast mode is except that the transmission delay that can be used for can also be used to estimating the acquisition time value when carrying out time synchronized between network.
In the WCDMA network as SNTP client's RNC/NodeB finish set up with OMC/RNC between the IP link (NodeB can be set up with OMC between directly Ethernet to connect also can be to set up an IPOA＜IP over ATM that arrives OMC via RNC passage, equally also can be the IPOA passage that is established to RNC) after, send repeatedly temporal information request to the SNTP server and carry out transmission delay estimation, and the influence of obtaining current precise time and removing propagation delay is with synchronous process of deadline.The temporal information that RNC/NodeB can also accept to broadcast in the time can carrying out subnet broadcast.
Network Transmission time-delay estimation volume when carrying out time synchronized can calculate according to timestamp information in the SNTP server time response message, calculate transmission delay, and be kept at this locality by Originate Timestamp T1, Receive Timestamp T2, Transmit Timestamp T3, four timestamp informations of Destination Timestamp T4.Transmission delay value estimation mode is as follows:
TDealy＝(T4-T1)-(T2-T3)/2
Can be provided as the mode of operation of the OMC or the radio network controller (RNC) of SNTP server by the OMC of operation maintenance center, and parameter, comprise the airtime at interval, client is operated under the Unicast pattern regularly time interval to SNTP server requests temporal information, udp port that SNTP uses number etc.
After NodeB receives broadcast from RNC, take out time (Transmit Timestamp) field that wherein server message leaves server, and according to preserved and RNC between the transmission delay value calculate current time value, and modification local zone time.
Fig. 1 is the embodiment flow chart of the inventive method, according to the flow process of Fig. 1:
The present invention is in step 1, configuration interface by OMC is provided with the time synchronized parameter, and parameter item comprises: server and client mode are selected, whether RNC serves as that time server is selected, the broadcasting fixed time interval, when using udp port number, customer end adopted Unicast mode synchronously to time interval of server requests temporal information;
In step 2, the SNTP service on server start-up time (OMC is when RNC also comprises RNC during also as server);
In step 3,4,5, initiatively send a request message as RNC, the NodeB of client to time server, acquisition time information is also estimated the Network Transmission time-delay;
In step 6,7,8,9, and if used broadcast mode by server according to the fixed time interval broadcast time information that is provided with, obtain temporal information if use ad hoc mode then regularly initiate request according to the time interval of setting to server by client;
The precise time value that obtains server in step 10 client is removed the time synchronization process of finishing oneself after transmission delay influences;
Protocol specification according to NTP, broadcasting can be adopted broadcasting or multicast mode in the subnet, and the IP address of NTP group unique be 224.0.1.1, but because SNTP does not provide the server identity affirmation mechanism, therefore whether be the RNC that have the right in notice carry out time synchronized, should avoid using multicast and use the subnet directional broadcasting if can't identify.
Wherein server end (radio network controller (RNC)) and client (NodeB) are all used the UDP123 port.
Mutual information format unified Definition between radio network controller in each step (RNC) and the NodeB, its concrete form is with reference to figure 2, shown in theing contents are as follows:
LI: the indication of jumping, whether show 1 minute has a second jump (be 59 seconds or 61 seconds last one minute), and 00 is normal, and 11 show that clock is asynchronous;
VN: protocol version defaults to 3; Pattern Mode: show that type of message is server acknowledge/Broadcast of client-requested/Unicast of Unicast;
Stratum: local clock grade;
Poll: the airtime shows that broadcast interval is 2 at interval
PollSecond, generally between 64 seconds-1024 seconds;
Precision: the local clock precision is eight bit signed integers, show precision be 1 second 2
PresicionDoubly;
Root Delay: total length of delay two-way time with respect to initial time source has the fixed-point number of symbol to represent with 32;
Root Dispersion: the total time deviation value with respect to initial time source has the fixed-point number of symbol to represent with 32;
Reference Clock Identifier: can show the clock source, such as source form atomic clock, GPS, other ntp servers etc.;
Reference Timestamp: local clock alignment time last time;
Originate Timestamp: client-requested is left the time of client;
Receive Timestamp: client-requested arrives the time of server end;
Transmit Timestamp: server message leaves the time of server;
Authenticator (optional): authentication code, do not use;
Wherein the expression mode of four timestamp is:
Each time stamp data type is the fixed-point number of a 64bit, shows counting second from 1: zero: zero on the one January in 1900 to timestamp point, and wherein preceding 32bit is an integer part, and back 32bit is a fractional part.
Claims (4)
1, the method for time synchronized in a kind of broadband CDMA system may further comprise the steps:
Step 1, the configuration interface by operation maintenance center are provided with the time synchronized parameter;
Simple network timing agreement SNTP service on step 2, the start-up time server;
Step 3, initiatively send a request message to time server as the radio network controller (RNC) of client, wireless network access point NodeB, acquisition time information is also estimated the Network Transmission time-delay;
Step 4, the selection of carrying out simple network timing agreement SNTP service mode are judged, if used broadcast mode by server according to the fixed time interval broadcast time information that is provided with, obtain temporal information if use ad hoc mode then regularly initiate request according to the time interval of setting to server by client;
Step 5, client obtain the precise time value of server, after the influence of removal transmission delay, finish the time synchronization process of oneself.
2, the method for time synchronized according to claim 2 is characterized in that, when described step 5 is carried out time synchronized, and can be according to timestamp information computing network transmission delay estimation volume in the simple network timing agreement SNTP server time response message.
3, the method for time synchronized according to claim 2 is characterized in that, the estimation mode of described transmission delay estimation volume is as follows:
TDealy=(T4-T1)-(T2-T3)/2, and be kept at this locality, in the formula,
T1 is the time that client-requested is left client; T2 is the time that client-requested arrives server end; T3 is the time that server message leaves server; T4 is for arriving the time of destination.
4, according to the method for one of any described time synchronized of claim 1-3, it is characterized in that, in the described step 1 time synchronized parameter is set, comprises: whether the selection of server and client mode, radio network controller (RNC) serve as the selection, broadcasting fixed time interval of time server, when using udp port number, customer end adopted Unicast mode synchronously to time interval of server requests temporal information.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100370864C (en) * | 2004-06-17 | 2008-02-20 | 大唐移动通信设备有限公司 | Network element time synchronizing method in mobile communication system |
| CN100419738C (en) * | 2004-06-15 | 2008-09-17 | 株式会社Ntt都科摩 | Method, system and server for managing data acquisition time, and information terminals |
| WO2010020120A1 (en) * | 2008-08-20 | 2010-02-25 | 华为技术有限公司 | Method, device and system for synchronizing time |
| CN1852288B (en) * | 2005-09-19 | 2010-05-12 | 华为技术有限公司 | Time transmitting method |
| CN1855784B (en) * | 2005-04-27 | 2011-04-13 | 艾格瑞系统有限公司 | Line-timing in packet-based networks |
| CN1906869B (en) * | 2004-01-09 | 2011-05-18 | 汤姆森许可贸易公司 | Time synchronizing device and process and associated products |
| CN101331736B (en) * | 2005-12-15 | 2011-11-02 | Abb技术有限公司 | Using travel-time as means for improving the accuracy of simple network time protocol |
| CN101217330B (en) * | 2008-01-02 | 2012-07-25 | 中兴通讯股份有限公司 | A method and device for time synchronism calibration |
| CN101611589B (en) * | 2007-02-14 | 2012-08-15 | 西门子公司 | Method and device for distributing a data segment of a data stream to a group of a plurality of users |
| CN102739446A (en) * | 2012-06-27 | 2012-10-17 | 中兴通讯股份有限公司 | Method and device for selecting network time protocol (NTP) servers |
| WO2013010405A1 (en) * | 2011-07-20 | 2013-01-24 | 中兴通讯股份有限公司 | System synchronization control method and apparatus |
| CN106909197A (en) * | 2017-02-28 | 2017-06-30 | 郑州云海信息技术有限公司 | A kind of virtualized host time management method and virtualized host system |
| CN110213174A (en) * | 2019-05-07 | 2019-09-06 | 广州市迪士普音响科技有限公司 | A kind of no-delay networking intercommunication control method |
| CN113489564A (en) * | 2021-07-04 | 2021-10-08 | 芯河半导体科技(无锡)有限公司 | Method for realizing SNTP client time synchronization |
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| BR9810524A (en) * | 1997-06-17 | 2000-09-19 | Siemens Ag | Process, mobile station and base station for time synchronization for a mobile station in a radio communication system |
| DE10034686A1 (en) * | 1999-09-13 | 2001-03-22 | Siemens Ag | Arrangement for transmitting information between two communication devices |
| US7068746B1 (en) * | 2000-03-01 | 2006-06-27 | Lucent Technologies Inc. | Base station transceiver to radio network controller synchronization filtering function |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1906869B (en) * | 2004-01-09 | 2011-05-18 | 汤姆森许可贸易公司 | Time synchronizing device and process and associated products |
| CN100419738C (en) * | 2004-06-15 | 2008-09-17 | 株式会社Ntt都科摩 | Method, system and server for managing data acquisition time, and information terminals |
| CN100370864C (en) * | 2004-06-17 | 2008-02-20 | 大唐移动通信设备有限公司 | Network element time synchronizing method in mobile communication system |
| CN1855784B (en) * | 2005-04-27 | 2011-04-13 | 艾格瑞系统有限公司 | Line-timing in packet-based networks |
| CN1852288B (en) * | 2005-09-19 | 2010-05-12 | 华为技术有限公司 | Time transmitting method |
| CN101331736B (en) * | 2005-12-15 | 2011-11-02 | Abb技术有限公司 | Using travel-time as means for improving the accuracy of simple network time protocol |
| CN101611589B (en) * | 2007-02-14 | 2012-08-15 | 西门子公司 | Method and device for distributing a data segment of a data stream to a group of a plurality of users |
| CN101217330B (en) * | 2008-01-02 | 2012-07-25 | 中兴通讯股份有限公司 | A method and device for time synchronism calibration |
| WO2010020120A1 (en) * | 2008-08-20 | 2010-02-25 | 华为技术有限公司 | Method, device and system for synchronizing time |
| WO2013010405A1 (en) * | 2011-07-20 | 2013-01-24 | 中兴通讯股份有限公司 | System synchronization control method and apparatus |
| CN102739446A (en) * | 2012-06-27 | 2012-10-17 | 中兴通讯股份有限公司 | Method and device for selecting network time protocol (NTP) servers |
| CN102739446B (en) * | 2012-06-27 | 2017-08-01 | 南京中兴新软件有限责任公司 | The method and apparatus for selecting Network Time Protocol server |
| CN106909197A (en) * | 2017-02-28 | 2017-06-30 | 郑州云海信息技术有限公司 | A kind of virtualized host time management method and virtualized host system |
| CN106909197B (en) * | 2017-02-28 | 2020-02-07 | 郑州云海信息技术有限公司 | Virtualization host time management method and virtualization host system |
| CN110213174A (en) * | 2019-05-07 | 2019-09-06 | 广州市迪士普音响科技有限公司 | A kind of no-delay networking intercommunication control method |
| CN113489564A (en) * | 2021-07-04 | 2021-10-08 | 芯河半导体科技(无锡)有限公司 | Method for realizing SNTP client time synchronization |
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