CN101931873A - Method for MBMS (Multimedia Broadcast Multicast Service) user to acquire network system time - Google Patents
Method for MBMS (Multimedia Broadcast Multicast Service) user to acquire network system time Download PDFInfo
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- CN101931873A CN101931873A CN2009100883475A CN200910088347A CN101931873A CN 101931873 A CN101931873 A CN 101931873A CN 2009100883475 A CN2009100883475 A CN 2009100883475A CN 200910088347 A CN200910088347 A CN 200910088347A CN 101931873 A CN101931873 A CN 101931873A
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Abstract
The invention discloses a method for an MBMS (Multimedia Broadcast Multicast Service) user to acquire network system time, which comprising the steps of: on a network side, acquiring system time, confirming a SFN (Single Frequency Network) corresponding to an initial point of a MCCH (Multipoint Control Channel) message modification period, then adjusting the acquired system time into system time corresponding to the SFN by utilizing the time difference between the SFN with the acquired system time and the SFN corresponding to the initial point, and issuing the adjusted system time to the MBMS user through a MCCH message on the network side in the MCCH message modification period of the initial point; and for the MBMS user, receiving the adjusted system time, and confirming the MCCH message modification period of the MCCH message carrying the system time and the SFN corresponding to the initial point of the MCCH message modification period, and taking the received system time as the confirmed system time of the SFN corresponding to the initial point. The invention can ensure that the MBMS user acquires accurate system time.
Description
Technical field
The present invention relates to the technology of obtaining of network system time, particularly mbms service (MBMS) user obtains the network system time method in the TD-SCDMA system.
Background technology
Because the unidirectional descending characteristic of radio network, terminal can't be to the server requests temporal information, and the temporal information of not carrying network side in present TD-MBMS standard and 3GPP standard is handed down to terminal, the time of terminal comprises the time of each application in the terminal like this, therefore the setting of terminal self can only be depended on, in time inconsistent of terminal and network side might be caused.
For the TD-SCDMA system, obtaining in the solution of network system time about MBMS user at present, only provided by network side mostly to MBMS user's sending system time, and the form of this system time information, the bit number that for example comprises, hour, minute and second counting form etc.But, for communication system, determine the moment of system time information from network side, carry out required the processing moment that back (for example according to agreement group specified bag) issues this system time information to network side, the centre is to need the certain delay of process, therefore, if the system time that network side and MBMS user all do not determine network side does not carry out any adjustment, then the system time that obtains of MBMS user remains inaccurate.
Summary of the invention
In view of this, the invention provides that MBMS user obtains the network system time method in a kind of TD-SCDMA system, can obtain system time accurately.
For achieving the above object, the present invention adopts following technical scheme:
A kind of network issues the network system time method to MBMS user, comprising:
Network side obtains system time, and definite MCCH message modification cycle and the pairing SFN of this modification cycle starting point;
Time difference between the SFN that network side utilizes described system time correspondence and the corresponding SFN of described starting point, the system time that obtains is adjusted into the pairing system time of the corresponding SFN of described starting point;
Network side is handed down to described MBMS user by MCCH message with adjusted system time in the described MCCH message modification cycle of determining.
Preferably, determine to satisfy SFN mod 2
m=0 SFN is the SFN of described MCCH message modification cycle starting point correspondence, and wherein, m is a MCCH message modification periodic coefficient.
Preferably, by RRC message the value of described m is broadcast to described MBMS user.
Preferably, satisfying SFN mod 2
mAmong=0 the SFN, be chosen in when preparing to issue described system time, at hand and the nearest SFN of the current SFN of distance, as the SFN of described MCCH message modification cycle starting point correspondence.
A kind of MBMS user receives the network system time method, comprising:
MBMS user receives the adjusted system time that network side issues by MCCH message, and the SFN of the starting point correspondence in the MCCH message modification cycle at definite described MCCH message place;
With the described adjusted system time that receives as the pairing system time of the corresponding SFN of described starting point.
Preferably, determine to satisfy SFN mod 2
mArrived among=0 the SFN and the nearest SFN of the corresponding SFN of the described MCCH message of distance, be the SFN of described MCCH message modification cycle starting point correspondence, wherein, m is for revising periodic coefficient.
Preferably, receive the value of network side by the described m of RRC information broadcast.
Preferably, this method further comprises: MBMS user is according to the time difference between the corresponding SFN of described MCCH message and the corresponding SFN of described starting point, the pairing system time of SFN of the described system time of definite reception.
Preferably, this method further comprises: the system time that obtains is scaled Greenwich Mean Time GMT, and according to the setting in time zone among the described MBMS user, is converted to local zone time.
As seen from the above technical solution, among the present invention, on the one hand, network side obtains system time, and the SFN of definite MCCH message modification cycle starting point correspondence, utilize the time difference between the corresponding SFN of SFN that obtains system time then, the system time that obtains is adjusted into the pairing system time of the corresponding SFN of described starting point with starting point; Network side in the cycle, is handed down to MBMS user by MCCH message with adjusted system time in the MCCH at starting point place message modification.On the other hand, MBMS user receives adjusted system time, and determine to carry MCCH message modification cycle at MCCH message place of this system time and SFN that should modification cycle starting point correspondence, with the system time that receives as the pairing system time of determining of starting point correspondence SFN.Like this, by network side the system time that obtains is adjusted, the SFN that the temporal information and the MCCH message modification cycle starting point that send is corresponding is corresponding, and the time that MBMS user receives is the pairing system of the corresponding SFN of starting point correct time.
Description of drawings
Fig. 1 issues network system time method schematic flow sheet for network among the present invention to MBMS user.
Embodiment
For making purpose of the present invention, technological means and advantage clearer, the present invention is described in further details below in conjunction with accompanying drawing.
Basic thought of the present invention is: the system time that issues is adjusted the pairing time point of the temporal information that makes MBMS user clearly to receive at network side.
In the MBMS business, network side can be to MBMS users broadcasting MCCH message, and there is the modification cycle in this MCCH message, in the same MCCH modification cycle, network side can repeat the message to the MCCH of MBMS users broadcasting, and the content of same MCCH interior each MCCH message of modification cycle remains unchanged.The present invention promptly utilizes the characteristic in MCCH message modification cycle, by MCCH message to MBMS user's transmitting system temporal information.Wherein, network side is converted to the zero-time of MCCH message modification cycle starting point correspondence with the system time that obtains, and is handed down to MBMS user in this MCCH message modification cycle.Like this, the system time that MBMS user received in arbitrary MCCH message modification cycle is the system time of this modification cycle starting point correspondence.
Concrete enforcement to the network system time obtaining method among the present invention is described in detail below.
Fig. 1 issues network system time method schematic flow sheet for network among the present invention to MBMS user.As shown in Figure 1, this method comprises:
It is all same as the prior art that network side obtains the moment and the mode of system time, for example obtains system time accurately according to ntp server/GPS.This system time is Coordinated Universal Time(UTC) (UTC), with 0: 0: 0 on the 6th January in 1980 be starting point, be accurate to second.Wherein, network side is specially radio network controller (RNC).
SFN is the radio frames numbering in the system, and it is 10ms that radio frames takies duration, and promptly the every 10ms of radio frame number increases progressively one, and this radio frames numbering value is 0-4096, and it is 0 that value is returned in value to 4096 back recirculation.Network and MBMS are with the radio frames being unit reception and transmission information per family.Among the present invention, determine the pairing SFN of the moment of above-mentioned accurate system time.
It is example that present embodiment obtains the particular system time with at a time quarter, suppose that the system time that obtains is A, and the subframe numbers of this system time correspondence of obtaining is SFN1.
This step is identified for issuing the MCCH message modification cycle of the system time that obtains in the step 101.After network side obtains system time, may need to send to MBMS user again through after some processing.When network side finishes described processing, when being ready for sending the system time that obtains, select a MCCH message modification cycle, begin to issue the system time that obtains in this MCCH message modification cycle starting point; The concrete MCCH message modification cycle of selecting can be any one MCCH message modification cycle on the horizon.For making MBMS user receive system time as early as possible, preferably, the MCCH message modification cycle of selection is for preparing transmitting system during the time, and is on the horizon, apart from the nearest MCCH message modification cycle of current time.
At all after dates of a definite MCCH message modification, further determine the SFN of this MCCH message modification cycle starting point correspondence.
Particularly, the SFN of MCCH message modification cycle starting point correspondence is: satisfy SFN mod 2
m=0 SFN, wherein, m is a MCCH message modification periodic coefficient, gives MBMS user by network by the RRC information broadcast.
When the MCCH message modification cycle of selecting be aforesaid on the horizon, apart from the nearest MCCH message modification of current time during the cycle, the SFN that determines in this step is: satisfy SFN mod 2
mAt hand and distance current SFN nearest SFN, be made as SFN2 among=0 the SFN.
For example, suppose m=3, obtain system time accurately when SFN=9, then the value of the SFN2 of the MCCH message modification cycle starting point correspondence obtained of this step is 16.
In this step,, the system time that obtains is adjusted according to the time difference between SFN1 and the SFN2.The most simply, the system time that obtains is added time difference between SFN1 and the SFN2 promptly can obtain adjusted system time.Wherein, adjusted system time precision can be set as required.
In this step, after MBMS user receives the system time that a MCCH message issues, need to determine this system time time corresponding point.As previously mentioned, at the network side sending system during time, carry in the MCCH message be should modification cycle starting point correspondence in this MCCH message modification cycle the pairing system time of SFN2, so MBMS user also adopts corresponding mode with network side when determining the system message that receives.
Particularly, determine to satisfy SFN mod 2
mArrived among=0 the SFN and the nearest SFN of the corresponding SFN of MCCH message that distance receives, be the SFN of this MCCH message modification cycle starting point correspondence, i.e. SFN2.
After determining the SFN2 of MCCH message modification cycle starting point correspondence, with the system time that carries in this MCCH message system time as the SFN2 correspondence.
The system time of determining in this step is UTC, if desired, can also it be carried out the time conversion by next step, to be suitable for application need.
In step 106, MBMS user has determined the pairing system time of the corresponding SFN of MCCH message modification cycle starting point.Usually, MBMS user can be converted to the system time of this starting point correspondence current system time, promptly carries the pairing system time of the corresponding SFN of MCCH message of system time.Particularly, if the SFN of the MCCH message correspondence of carrying system time that MBMS user receives is SFN3, then according to the time difference between SFN3 and SFN2 (UE can obtain this time difference by existing manner), and the system time of SFN2 correspondence, can determine the system time of SFN3 correspondence.Then, the system time with this SFN3 correspondence is scaled Greenwich Mean Time GMT again, and according to the setting in time zone among the MBMS user, is converted to local zone time, is the current local zone time of system.
So far, the method handling process end that MBMS user obtains system time among the present invention.In above-mentioned flow process, the network system time obtaining method among the present invention is divided into two parts, and step 101～104 issue network system time method flow process for network to MBMS user, and step 105～107 receive the network system time method for MBMS user.Cooperatively interact by network side and MBMS user, carry out the adjustment of system time, make MBMS user can obtain system time accurately, and can determine the pairing time point of system time of acquisition at network side; Simultaneously, utilize the characteristic sending system time in MCCH message modification cycle, eat dishes without rice or wine only to need to send the UTC temporal information and get final product, adjust any time or SFN information, make empty overhead less and need not to carry other.
Being preferred embodiment of the present invention only below, is not to be used to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a network issues the network system time method to MBMS user, it is characterized in that, this method comprises:
Network side obtains system time, and definite MCCH message modification cycle and the pairing SFN of this modification cycle starting point;
Time difference between the SFN that network side utilizes described system time correspondence and the corresponding SFN of described starting point, the system time that obtains is adjusted into the pairing system time of the corresponding SFN of described starting point;
Network side is handed down to described MBMS user by MCCH message with adjusted system time in the described MCCH message modification cycle of determining.
2. method according to claim 1 is characterized in that, determines to satisfy SFN mod 2
m=0 SFN is the SFN of described MCCH message modification cycle starting point correspondence, and wherein, m is a MCCH message modification periodic coefficient.
3. method according to claim 2 is characterized in that, by RRC message the value of described m is broadcast to described MBMS user.
4. method according to claim 2 is characterized in that, is satisfying SFN mod 2
mAmong=0 the SFN, be chosen in when preparing to issue described system time, at hand and the nearest SFN of the current SFN of distance, as the SFN of described MCCH message modification cycle starting point correspondence.
5. a MBMS user receives the network system time method, it is characterized in that, this method comprises:
MBMS user receives the adjusted system time that network side issues by MCCH message, and the SFN of the starting point correspondence in the MCCH message modification cycle at definite described MCCH message place;
With the described adjusted system time that receives as the pairing system time of the corresponding SFN of described starting point.
6. method according to claim 5 is characterized in that, determines to satisfy SFN mod 2
mArrived among=0 the SFN and the nearest SFN of the corresponding SFN of the described MCCH message of distance, be the SFN of described MCCH message modification cycle starting point correspondence, wherein, m is for revising periodic coefficient.
7. method according to claim 6 is characterized in that, receives the value of network side by the described m of RRC information broadcast.
8. according to arbitrary described method in the claim 5 to 7, it is characterized in that, this method further comprises: MBMS user is according to the time difference between the corresponding SFN of described MCCH message and the corresponding SFN of described starting point, the pairing system time of SFN of the described system time of definite reception.
9. method according to claim 8 is characterized in that, this method further comprises: the system time that obtains is scaled Greenwich Mean Time GMT, and according to the setting in time zone among the described MBMS user, is converted to local zone time.
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| CN 200910088347 CN101931873B (en) | 2009-06-26 | 2009-06-26 | Method for MBMS (Multimedia Broadcast Multicast Service) user to acquire network system time |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108737969A (en) * | 2017-04-17 | 2018-11-02 | 普天信息技术有限公司 | A kind of group-calling service transmission conversion process method and device |
Citations (3)
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| WO2006085059A1 (en) * | 2005-02-08 | 2006-08-17 | Nokia Siemens Networks Gmbh & Co. Kg | A method of determining successful receipt at a mobile terminal |
| CN101132545A (en) * | 2006-08-24 | 2008-02-27 | 大唐移动通信设备有限公司 | Method and system for implementing multimedia broadcast multicast in mobile communication system |
| CN101150824A (en) * | 2006-09-18 | 2008-03-26 | 大唐移动通信设备有限公司 | A setting method for access probability factor and method for identifying user device quantity |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006085059A1 (en) * | 2005-02-08 | 2006-08-17 | Nokia Siemens Networks Gmbh & Co. Kg | A method of determining successful receipt at a mobile terminal |
| CN101132545A (en) * | 2006-08-24 | 2008-02-27 | 大唐移动通信设备有限公司 | Method and system for implementing multimedia broadcast multicast in mobile communication system |
| CN101150824A (en) * | 2006-09-18 | 2008-03-26 | 大唐移动通信设备有限公司 | A setting method for access probability factor and method for identifying user device quantity |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108737969A (en) * | 2017-04-17 | 2018-11-02 | 普天信息技术有限公司 | A kind of group-calling service transmission conversion process method and device |
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