CN1452337A - Packet control function and multiple packet data service node clock self-synchronization method - Google Patents
Packet control function and multiple packet data service node clock self-synchronization method Download PDFInfo
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- CN1452337A CN1452337A CN 02116582 CN02116582A CN1452337A CN 1452337 A CN1452337 A CN 1452337A CN 02116582 CN02116582 CN 02116582 CN 02116582 A CN02116582 A CN 02116582A CN 1452337 A CN1452337 A CN 1452337A
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Abstract
A packet control function (PCF) and a clock synchronization control between multiple PDSNs for CDMA network is characterized by that a global system variable Time Diff (PDSN) for recording the clock difference between each PDSN and PCF is introduced for synchronizing the clocks of different PDSNs.
Description
Technical field
The invention belongs to the wireless mobile telecommunication technology field, be applicable in code division multiple access (CDMA) the cellular radio Communication system network, the clock synchronization control between Packet Control Function (PCF) and a plurality of grouping control service node (PDSN).
Background technology
In code division multiple access (hereinafter to be referred as CDMA) cellular radio Communication system, when Packet Control Function (hereinafter to be referred as PCF) and grouping are controlled service node (hereinafter to be referred as PDSN) when being connected, clock synchronization is the method for a safeguards system safety, and is a function that must have in the communication protocol regulation.But in practice, when a PCF is connected with a plurality of PDSN, owing to do not stipulate out the unified method of synchronization in the communication protocol, and the clock between a plurality of PDSN itself is just asynchronous, thereby the clock synchronization between PCF and a plurality of PDSN often becomes a difficult point.
Common settling mode is all to add clock synchronization software on all PCF and PDSN, clock is carried out synchronously, this requires all PCF and PDSN all to dispose identical clock synchronization protocol and clock synchronization source, but owing to lack unified regulation in the communication protocol, this mode often is difficult to realize.
Another common settling mode is that all PCF and PDSN get clock from hardware clock (CMOS), these clocks carried out synchronously, and also be very difficult thing but will allow hardware clock (CMOS) synchronous.
Summary of the invention
The present invention will solve the problem that above-mentioned prior art exists, the system clock motor synchronizing control method of a kind of Packet Control Function (PCF) with a plurality of grouping control service nodes (PDSN) is provided, this method need not other clock synchronization server and software thereof, also need not the configure hardware clock and increases new clock synchronization signaling process.
Technical scheme of the present invention is as follows:
In code division multiple access (hereinafter to be referred as CDMA) network, when group control of functional node (hereinafter to be referred as PCF) and packet data serving node (hereinafter to be referred as PDSN) are finished the data service of cdma network jointly, form 4 kinds of signaling messages in the A11 interface according to CDMA2000A interface specification agreement regulation carry out alternately, these 4 kinds of signaling messages are, PCF issues the signaling message of PDSN: application for registration (A11_Registration_Request), accreditation verification (A11_Registration_Acknowledge), PDSN issues the signaling message of PCF: registration reply (A11_Registration_Reply), register update (All_Registration_Update), PCF and PDSN extend this as Identification information unit wherein the system clock of oneself, the present clock that preceding 4 bytes of this information unit are transmit legs when sending above-mentioned 4 kinds of signaling messages; A PCF can link to each other with a plurality of PDSN, a PDSN also can link to each other with a plurality of PCF, the invention is characterized in: introduce between the different PDSN of record and the PCF the time clock correction global system variable TimeDiff (PDSN) come clock between the synchronous different PDSN; Its step is as follows:
(1) increase system variable TimeDiff (PDSN) on PCF, the quantity of TimeDiff (PDSN) is identical with the quantity of the PDSN that links to each other with PCF;
(2) system variable TimeDiff (PDSN) is initialized as 0;
(3) at every turn at PCF when PDSN sends the A11 signaling message, the Identification time of filling in all is: Identification=TimeDiff (PDSN)+Time (PCF);
(4) each when PCF receives the A11 signaling message of PDSN foldback, recomputate and saved system variable TimeDiff (PDSN)=Time (PDSN)-Time (PCF) according to its Identification time of returning.
Described Time (PCF) is the present system time of PCF, and Time (PDSN) is the PDSN time that PDSN carries in the A11 signaling message that PCF returns, and TimeDiff (PDSN) is the time difference of PDSN and PCF; During system variable TimeDiff (PDSN) initialization, can also be arbitrary value.
Described introducing write down between different PDSN and the PCF the time clock correction global system variable TimeDiff (PDSN) method of coming the clock between the synchronous different PDSN, also can be applied in PDSN and go up clock between the synchronous different PCF; Only need a side to adopt said method among PCF and the PDSN, can reach clock synchronization; PCF and PDSN two sides adopt said method, also can reach clock synchronization.
Major advantage of the present invention is: the system variable TimeDiff (PDSN) of the time difference by introducing each PDSN of record and PCF, and serve as that synchronous between PCF and a plurality of PDSN realized on the basis automatically with it.This method PDSN need not to do any change; Need not other clock synchronization server and software thereof; Need not configure hardware clock (CMOS); Need not to increase new clock synchronization signaling process.Solved a difficult problem of the prior art.
Description of drawings
Fig. 1 is realization flow figure of the present invention
Its synchronous realization flow can be divided into exploration, synchronously, synchronous three phases again:
Sound out: PCF sends the All_Registration_Request message of carrying not synchronous self to PDSN for the first time time.
Synchronously: PDSN returns the A11_Registration_Reply message of carrying the PDSN time to PCF, and PCF is according to the new TimeDiff of this Time Calculation (PDSN).Because PDSN can refuse to insert owing to the A11_Registration_Request message asynchronism(-nization) step of souning out, PCF should send the A11_Registration_Request message of carrying the synchronous time once more and insert, and current PDSN should accept access.
Synchronous again: as to receive whenever that later on PDSN should be according to the new TimeDiff of this Time Calculation (PDSN) to the A11 message of the PDSN time of carrying that PCF returns.Can ensure that like this clock between PCF and the PDSN is synchronous for a long time.Simultaneously, because the A11 signaling message that PCF sends all carries the synchronous time, so can realize clock synchronization.
Embodiment
Be connected to the self synchronous implementation procedure of example its clock of explanation with a PCF and PDSN, its concrete steps are:
1, define system variable TimeDiff (PDSN) on PCF is with the time difference of specific PDSN of TimeDiff (PDSN) expression and this PCF;
2, TimeDiff (PDSN) is initialized as 0;
3, at PCF for the first time when PDSN sends application for registration (A11_Registration_Request) signaling message, the system clock of filling in is Identification=TimeDiff (PDSN)+Time (PCF), and wherein Time (PCF) is the present system time of PCF;
4, stipulate according to agreement, after PDSN receives application for registration (A11_Registration_Request) signaling message, can return registration reply (A11_Registration_Reply) signaling message immediately, what the Identification information unit in this registration reply signaling message was filled in is the system clock of PDSN, be Identification=Time (PDSN), wherein Time (PDSN) is the present system time of PDSN;
5, PCF recomputates TimeDiff (PDSN)=TimeDiff (PDSN)-Time (PCF) after receiving registration reply (A11_Registration_Reply) signaling message immediately;
6, after, if PCF sends application for registration (A11_Registration_Request) signaling message or accreditation verification (A11_Registration_Acknowledge) signaling message to PDSN again, fill in Identification=TimeDiff (PDSN)+Time (PCF) equally;
Send the A11 signaling message if 7 PCF receive, then recomputate TimeDiff (PDSN) once more, computing formula is: TimeDiff (PDSN)=TimeDiff (PDSN)-Time (PCF);
It is 8, following that the rest may be inferred.
Claims (3)
1, the self synchronous method of the clock of a kind of Packet Control Function and a plurality of packet data serving nodes, relate in code division multiple access (hereinafter to be referred as CDMA) network, when group control of functional node (hereinafter to be referred as PCF) and packet data serving node (hereinafter to be referred as PDSN) are finished the data service of cdma network jointly, form 4 kinds of signaling messages in the A11 interface according to CDMA2000A interface specification agreement regulation carry out alternately, these 4 kinds of signaling messages are, PCF issues the signaling message of PDSN: application for registration (A11_Registration_Request), accreditation verification (A11_Registration_Acknowledge), PDSN issues the signaling message of PCF: registration reply (A11_Registration_Reply), register update (A11_Pegistration_Update), PCF and PDSN extend this as Identification information unit wherein the system clock of oneself, the present clock that preceding 4 bytes of this information unit are transmit legs when sending above-mentioned 4 kinds of signaling messages; A PCF can link to each other with a plurality of PDSN, and a PDSN also can link to each other with a plurality of PCF, it is characterized in that: introduce between the different PDSN of record and the PCF the time clock correction global system variable TimeDiff (PDSN) come clock between the synchronous different PDSN; Its step is as follows:
(1) increase system variable TimeDiff (PDSN) on PCF, the quantity of TimeDiff (PDSN) is identical with the quantity of the PDSN that links to each other with PCF;
(2) system variable TimeDiff (PDSN) is initialized as 0;
(3) at every turn at PCF when PDSN sends the A11 signaling message, the Identification time of filling in all is: Identification=TimeDiff (PDSN)+Time (PCF);
(4) each when PCF receives the A11 signaling message of PDSN foldback, recomputate and saved system variable TimeDiff (PDSN)=Time (PDSN)-Time (PCF) according to its Identification time of returning.
2, the self synchronous method of the clock of Packet Control Function according to claim 1 and a plurality of packet data serving nodes, it is characterized in that: described Time (PCF) is the present system time of PCF, Time (PDSN) is the PDSN time that PDSN carries in the A11 signaling message that PCF returns, and TimeDiff (PDSN) is the time difference of PDSN and PCF; During system variable TimeDiff (PDSN) initialization, can also be arbitrary value.
3, the self synchronous method of the clock of Packet Control Function according to claim 1 and a plurality of packet data serving nodes, it is characterized in that: described introducing write down between different PDSN and the PCF the time clock correction global system variable TimeDiff (PDSN) method of coming the clock between the synchronous different PDSN, also can be applied in PDSN and go up clock between the synchronous different PCF; Only need a side to adopt said method among PCF and the PDSN, can reach clock synchronization; PCF and PDSN two sides adopt said method, also can reach clock synchronization.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021165823A CN100428657C (en) | 2002-04-12 | 2002-04-12 | Packet control function and multiple packet data service node clock self-synchronization method |
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| CNB021165823A CN100428657C (en) | 2002-04-12 | 2002-04-12 | Packet control function and multiple packet data service node clock self-synchronization method |
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| Publication Number | Publication Date |
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| CN1452337A true CN1452337A (en) | 2003-10-29 |
| CN100428657C CN100428657C (en) | 2008-10-22 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1890905B (en) * | 2003-12-19 | 2011-09-28 | 英特尔公司 | Method and device for program clock synchronization |
| CN101998521B (en) * | 2004-12-01 | 2013-03-20 | 捷讯研究有限公司 | Improved buffering for flow control |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6834050B1 (en) * | 2000-03-10 | 2004-12-21 | Telefonaktiebolaget Lm Ericsson (Publ) | Packet core function and method of selecting a packet data service node/foreign agent in a packet data network |
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2002
- 2002-04-12 CN CNB021165823A patent/CN100428657C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1890905B (en) * | 2003-12-19 | 2011-09-28 | 英特尔公司 | Method and device for program clock synchronization |
| CN101998521B (en) * | 2004-12-01 | 2013-03-20 | 捷讯研究有限公司 | Improved buffering for flow control |
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| CN100428657C (en) | 2008-10-22 |
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