CN102056284A - Time synchronization method, system and device - Google Patents
Time synchronization method, system and device Download PDFInfo
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- CN102056284A CN102056284A CN2009102366492A CN200910236649A CN102056284A CN 102056284 A CN102056284 A CN 102056284A CN 2009102366492 A CN2009102366492 A CN 2009102366492A CN 200910236649 A CN200910236649 A CN 200910236649A CN 102056284 A CN102056284 A CN 102056284A
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Abstract
The embodiment of the invention discloses a time synchronization method which comprises the steps of: sending system time to a terminal by a base station through a physical channel between the base station and the terminal; and receiving the system time sent by the base station by the terminal in the physical channel, calibrating the terminal local time according to the system time, and keeping the terminal local time synchronous with the system time after calibration. The embodiment of the invention also discloses a wireless communication system and device. By adopting the invention, the terminal reliably and conveniently obtains the system time, thereby ensuring that the local time is kept synchronous with the system time.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to a kind of method for synchronizing time, system and equipment.
Background technology
In Long Term Evolution (LTE) system, entered on how reducing the workload of operator when the networking and the network optimization, therefore introduced self-optimizing network (self-Optimization network, SON) project and minimize test (minimization drive test, the MDT) project of driving.
In the existing LTE system descending transmission channel to the mapping of physical channel as shown in Figure 1, uplink transport channel to the mapping of physical channel as shown in Figure 2, wherein:
PBCH (Physical broadcast channel) is a Physical Broadcast Channel, is used for carrying the information of the MIB of broadcast.PCFICH (Physical control format indicator channel) is a Physical Control Format Indicator Channel, and being used to refer to has several OFDM symbols to use for control character in each subframe.PDCCH (Physical downlink control channel) is a Physical Downlink Control Channel, by the running time-frequency resource of PDCCH indication PDSCH or PUSCH, information such as coded system.PHICH (Physical Hybrid ARQ Indicator Channel) is used to carry the descending HARQ feedback information of uplink.PDSCH (Physical downlink shared channel) is a Physical Downlink Shared Channel.PMCH (Physical multicast channel) is a Physical Multicast Channel.PUCCH (Physical uplink control channel) is a Physical Uplink Control Channel, is used to carry upward HARQ feedback information, dispatch request information (SR), CQI report information of downlink transfer etc.PUSCH (Physical uplink shared channel) is a Physical Uplink Shared Channel.PRACH (Physical random access channel) is a Physical Random Access Channel.BCH is a broadcast channel, and MCH is a Multicast Channel, and PCH is a paging channel, and DL-SCH is descending complement channel, and UL-SCH is up complement channel, and RACH is a Random Access Channel.
The thought of MDT is that terminal (UE) reports relevant metrical information among the LTE, or the turkey of correspondence failure noted reports network side then.Under UE also needs the time at this moment preserved when record metrical information and turkey, carry up together then, be used for auxiliary network to do the network optimization.
The UE measuring amount comprises at present: the cycle descending pilot frequency is measured (Periodical downlink pilot measurements), service district becomes than setting thresholding poor (Serving Cell becomes worse than threshold), PHR becomes than setting thresholding poor (Transmit power headroom becomes less than threshold), access failure (Random access failure) at random, paging channel take defeat (Paging Channel Failure), broadcast channel take defeat (Broadcast Channel failure).
In above-mentioned six UE measuring amount, have only the 4th temporal information that does not need reported event, other 5 temporal informations that all need reported event.
Such as, UE measures reporting of (Periodical downlink pilot measurements) to first cycle descending pilot frequency, and the parameter that need report sees table:
As seen the UE temporal information consistent with network side is crucial to MDT, can make the time of UE and network side guarantee that consistent method specifically has following two kinds at present:
First kind: the GPS mode.
By global positioning system (GPS) calibration, the UE with GPS function can receive the time signal on the GPS, guarantees that by this time calibration the time of UE safeguards consistent with network side.
Second kind: time server.
This method is directly to utilize terminal and time server to carry out mutual acquisition time information by application layer protocol.When satisfying specified conditions (as client terminal start-up etc.), terminal is to the request of the ntp server initiation time of network side, extract the temporal information in the response message, and, guarantee the basically identical of terminal time and network side time according to the incremental time that local timer provides.
In realizing process of the present invention, the inventor finds to exist in the prior art following technical problem:
Adopt the GPS calibration that two problems are arranged:
First: GPS is not that the UE that does not have the GPS function can't adopt the GPS method alignment time to the necessarily requiring of UE;
Second: can not guarantee that UE one receives the time signal on the GPS surely even UE has the GPS function, just be difficult to receive satellite-signal indoor such as UE.
Adopt the time server mode to have the following shortcoming:
Because the mutual link of newly-increased terminal and network needs to formulate complete terminal and ntp server and carries out mutual flow process;
Ntp server is on the basis of satisfying network side time synchronized demand, also can be towards terminal, because terminal number is huge, if great amount of terminals often all needs and server communicates, impact to server is big, if user that requirement inserts in the same time and network measurement equipment (such as the base station) are too much even may cause the NTP system crash;
Extensibility a little less than, if the non-ntp server of following adopted provides temporal information, then terminal and corresponding flow process all need be made amendment;
Robustness is relatively poor, and the reliability of time server can become the bottleneck of whole network reliability, in case server owing to increasing of number of users collapsed, then other network measurement equipments also can't obtain time synchronized.
Summary of the invention
The embodiment of the invention provides a kind of method for synchronizing time, system and equipment, is used to provide a kind of reliable, easy terminal to obtain system time and utilizes this system time to carry out the scheme of time calibration.
A kind of method for synchronizing time, this method comprises:
Physical Downlink Shared Channel PDSCH is passed through to the terminal transmitting system time in the base station;
Terminal receives the system time that described base station sends at described PDSCH, according to this system time the terminal local zone time is calibrated, and calibration back terminal local zone time keeps synchronous with system time.
A kind of wireless communication system, this system comprises:
The base station was used for by Physical Downlink Shared Channel PDSCH to the terminal transmitting system time;
Terminal is used for receiving the system time that described base station sends at described PDSCH, according to this system time the terminal local zone time is calibrated, and calibration back terminal local zone time keeps synchronous with system time.
A kind of base station, this base station comprises:
Time acquisition unit is used to obtain the system time of this place, base station communication system;
The time transmitting element is used for sending described system time by Physical Downlink Shared Channel PDSCH to terminal.
A kind of terminal, this terminal comprises:
The time receiving element is used for receiving the system time that send the base station at Physical Downlink Shared Channel PDSCH;
Time calibration, the unit was used for according to described system time the terminal local zone time being calibrated, and calibration back terminal local zone time keeps synchronous with system time.
Among the present invention, to the terminal transmitting system time, terminal receives the system time that the base station sends at PDSCH by PDSCH in the base station, according to this system time the terminal local zone time is calibrated, and calibration back terminal local zone time keeps synchronous with system time.As seen, adopt the present invention, do not need the requirement terminal to possess the GPS function, also do not need to increase or change terminal and ntp server carries out mutual flow process, it is synchronous that the terminal of any connecting system all can obtain the system time line time of going forward side by side; Do not exist the NTP system crash to cause terminal can't obtain system time and then can't synchronous problem of deadline yet, make acquisition system system time that terminal can be reliable, easy and realize with system time synchronously.
Description of drawings
Fig. 1 is the mapping schematic diagram of descending transmission channel and down physical channel in the prior art;
Fig. 2 is the mapping schematic diagram of uplink transport channel and uplink physical channel in the prior art;
The method flow schematic diagram that Fig. 3 provides for the embodiment of the invention;
Fig. 4 is that the system time in the embodiment of the invention sends schematic diagram;
Fig. 5 is the form schematic diagram of MAC CE in the embodiment of the invention;
The system configuration schematic diagram that Fig. 6 provides for the embodiment of the invention;
The architecture of base station schematic diagram that Fig. 7 provides for the embodiment of the invention;
The terminal structure schematic diagram that Fig. 8 provides for the embodiment of the invention.
Embodiment
In order to provide a kind of reliable, easy terminal to obtain system time and to utilize this system time to carry out the scheme of time calibration, the embodiment of the invention provides a kind of method for synchronizing time, in this method, the base station sends to terminal by the physical channel of this base station and terminal room with system time, and terminal is calibrated the terminal local zone time according to this system time.
Physical channel among the present invention can be the PDSCH in the LTE system, can also be the physical channel with system information sending function of other any base station and terminal room.Below all being that example describes to the terminal transmitting system time by PDSCH.
Referring to Fig. 3, the method for synchronizing time in the LTE system that the embodiment of the invention provides specifically may further comprise the steps:
Step 30: Physical Downlink Shared Channel (PDSCH) is passed through to the terminal transmitting system time in the base station;
Step 31: terminal receives the system time that described base station sends at PDSCH, according to this system time the terminal local zone time is calibrated, and calibration back terminal local zone time keeps synchronous with system time.
In the step 30, the base station to the terminal transmitting system time, specifically can be adopted following breeding mode by PDSCH:
First kind, the base station at first is carried at system time the predefined indication information element of access at random (MAC CE) that is used for the media access control layer of system time broadcasting, and sends MACCE by PDSCH to terminal.
Second kind, the base station at first is carried at system time in Radio Resource control (RRC) signaling, and sends this RRC signaling by PDSCH to terminal.
For above-mentioned dual mode, the base station can be at fixing descending sub frame, by PDSCH to the terminal transmitting system time; Accordingly, terminal receives the system time that the base station sends at this fixing descending sub frame by PDSCH.
The base station can also be in predefined scheduling time that comprises a plurality of descending sub frames in the window, by PDSCH to the terminal transmitting system time; Accordingly, terminal receives the system time that the base station sends continuously by PDSCH in described scheduling time window.
Preferable, when adopting the send mode of above-mentioned second kind of system time, the base station by PDSCH before terminal sends the RRC signaling, can be by time domain and/or the frequency domain resource of PDCCH dispatch terminal receiving system time.Concrete, the base station utilizes Physical Downlink Control Channel (PDCCH) scheduling of carrying Radio Network Temporary Identifier (RNTI) to carry the PDSCH of system time; This RNTI is predefined RNTI or the existing RNTI of LTE system that is used for system time broadcasting; After terminal receives the PDCCH that carries this RNTI in detection,, receive the RRC signaling of carrying system message by PDSCH in the time domain and/or the frequency domain resource position of this PDCCH indication.
Certainly, if the PDCCH time-domain resource of dispatch terminal receiving system time not, then terminal receives the system time on the PDSCH at predefined fixedly time-domain position place; If PDCCH is the frequency domain resource of dispatch terminal receiving system time not, then terminal receives the system time on the PDSCH at predefined fixedly frequency domain position place.
After terminal is calibrated the terminal local zone time according to the system time that receives, if need report measurement information, or turkey, then with current terminal local zone time and metrical information, or turkey together reports network side.
Among the present invention, the time granularity of system time can be 1 millisecond.This system time is specifically as follows: send first subframe time corresponding in the subframe place radio frames of described system time; Perhaps, the subframe time corresponding in other radio frames except that described radio frames; Perhaps, send the subframe time corresponding of described system time.System time among the present invention is meant the network side time of place, base station communication system.
Below the present invention is specifically described:
Utilize the PDSCH sending system time of LTE system among the present invention, the PDSCH channel is by the PDCCH channel dispatch, and PDSCH can carry the message of broadcast type.
Attention: the system time information that network side issues among the present invention is that terminal is used for and the synchronous usefulness of the network equipment, is not equal to above the mobile phone application layer temporal information and clock to the user.Certainly terminal can utilize this time to calibrate the time of user application layer simultaneously.
Among the present invention, system time can be the time that first subframe of radio frames sends, and also can be the transmitting time of carrying the subframe of system time.The time granularity can be 1ms.Certainly it can also be time with respect to certain subframe of certain radio frames.Figure 4 shows that the transmitting time of the subframe of carrying system time.
The supposing the system time carries and the SFN=512 frame carries in the SFN=0 radio frames respectively.Wherein, SFN is a System Frame Number.
If the system time that issues at SFN=0 is 100 milliseconds of 10: 6: 10 on the 16th February in 2009, then the system time that issues at the SFN=512 frame is 220 milliseconds of 10: 6: 15 on the 16th February in 2009.
If UE receives the system time that network side issues at SFN=0, just can directly utilize 100 milliseconds of clocks of safeguarding oneself, 10: 6: 10 on the 16th February in 2009.Such as, can be behind 20 frames be own clock setting 300 milliseconds of 10: 6: 10 on the 16th February in 2009.
Network side is carried at PDSCH with system time and upward sends, and this system time can carry in MACCE down, also can adopt RRC message to carry, and is specific as follows:
Mode one: the mode that adopts MAC CE.
Adopt this mode need increase new MAC CE, at first just need expand logical channel number (LCID) territory.As shown in the table, can expand the LCID that carries and be 11001 MAC CE for being used for the MAC CE of system time broadcasting (time broadcast).
Concrete MAC CE design can be as shown in Figure 5, and how many bytes are concrete system time information occupy need be according to the granularity decision of system time information.
Mode two: adopt the RRC signaling to carry system time information.
Setting up at RRC increases cell (IE) and comes to terminal reporting system temporal information in the process.
Adopt this mode need increase RNTI newly.Physical layer specifically is that category information by the PDSCH that the RNTI on the PDCCH identifies scheduling subsequently.Dispatch by SI-RNTI such as broadcast, beep-page message is dispatched by P-RNTI.We can increase T-RNTI newly and come scheduling time information.
Certainly can also do expansion to the information that P-RNTI carries, make Paging information carry temporal information.Just do not increase new RNTI.
Provided the method that adopts MAC CE and RRC message to carry system time above,, need do regulation equally at the time that issues, made things convenient for UE to monitor at this dual mode.
A kind of mode can be the mode of fixed position, and just the subframe of transmitting system time is fixed, and UE just can go the receiving system time at a fixed time like this.
Another kind of mode can be the mode that the scheduling time window is set.Promptly design one scheduling time window, UE is the receiving system time in the scheduling time window, this mode can guarantee certain dispatching flexibility.
The present invention will be described with specific embodiment below:
Embodiment one:
In the present embodiment, the base station is handed down to terminal by MAC CE with system time in the set time, and terminal was located to receive the system time that the base station issues in the set time, and is specific as follows:
Step S01: the base station sends to terminal with the MAC CE that carries system time by PDSCH at first descending sub frame of the radio frames of SFN=0;
Step S02: terminal is monitored PDSCH at first descending sub frame of the radio frames of SFN=0, and reads the system time among the MAC CE that the PDSCH that listens to carries;
Step S03: the system time that the terminal utilization reads is safeguarded local clock.
Embodiment two:
In the present embodiment, the base station the scheduling time of setting that comprises 3 descending sub frames in the window by MACCE to the continuous transmitting system of the terminal time, terminal receives the system time that the base station issues scheduling time continuously in this window, specific as follows:
Step S11: the base station radio frames first, second and the 3rd descending sub frame, send the MAC CE carry system time to terminal by PDSCH;
Step S12: terminal continuously radio frames first, second and the 3rd descending sub frame monitor PDSCH, and read in radio frames first, the system time among the MAC CE that carries of second and the 3rd PDSCH that descending sub frame listens to;
Step S13: the system time that the terminal utilization reads is safeguarded local clock.
Embodiment three:
In the present embodiment, the base station is handed down to terminal by the RRC signaling with system time in the set time, before sending the RRC signaling, receive the frequency domain resource of PDSCH by the PDCCH dispatch terminal, terminal was located in the set time, the frequency domain position place of PDCCH indication receives the system time that the base station issues, and is specific as follows:
Step S21: the base station sends the PDCCH that utilizes predefined T-RNTI scrambling, the frequency domain resource positional information of carried terminal receiving system time among this PDCCH to terminal;
Step S22: first descending sub frame in first radio frames after sending PDCCH of base station sends the RRC signaling of carrying system information by PDSCH to terminal;
Step S23: after terminal receives the PDDCH that carries T-RNTI in detection, the system time in the RRC signaling that the reception base station, frequency domain position place of first descending sub frame of first radio frames after receiving PDCCH and PDCCH indication sends;
Step S24: the system time that the terminal utilization reads is safeguarded local clock.
Embodiment four:
In the present embodiment, the base station is handed down to terminal by the RRC signaling with system time in the scheduling time of setting in the window, before sending the RRC signaling, receive the frequency domain resource of PDSCH by the PDCCH dispatch terminal, terminal in this window scheduling time, the frequency domain position place of PDCCH indication receives the system time that the base station issues, and is specific as follows:
Step S31: the base station sends the PDCCH that utilizes predefined T-RNTI scrambling, the frequency domain resource positional information of carried terminal receiving system time among this PDCCH to terminal;
Step S32: first of first radio frames behind the base station transmission PDCCH, second and the 3rd descending sub frame send the RRC signaling of carrying system time by PDSCH to terminal;
Step S33: after terminal received the PDDCH that carries T-RNTI in detection, the frequency domain position place of first of first radio frames after receiving PDCCH, second and the 3rd descending sub frame and PDCCH indication received the system time in the RRC signaling that the base station sends continuously;
Step S34: the system time that the terminal utilization reads is safeguarded local clock.
Referring to Fig. 6, the embodiment of the invention also provides a kind of wireless communication system, and this system comprises:
Described base station 60 is used for:
Between be carried at the predefined MAC CE that is used for system time broadcasting, and send described MAC CE to terminal by PDSCH.
Described base station 60 is used for:
System time is carried in the RRC signaling, and sends described RRC signaling to terminal by PDSCH.
Described base station 60 is used for:
At fixing descending sub frame, by described PDSCH to the terminal transmitting system time;
Accordingly, described terminal 61 is used for:
At described descending sub frame, receive the system time that described base station sends by described PDSCH.
Described base station 60 is used for:
In predefined scheduling time that comprises a plurality of descending sub frames in the window, by described PDSCH to the terminal transmitting system time;
Accordingly, described terminal 61 is used for:
In described scheduling time window, receive the system time that described base station sends continuously by described PDSCH.
Described base station 60 also is used for:
Send described RRC signaling to terminal before, utilize the physical downlink control channel PDCCH of carrying RNTI to dispatch described PDSCH; Described RNTI is predefined RNTI or the described LTE existing RNTI of system that is used for system time broadcasting;
Accordingly, described terminal 61 is used for:
After receiving the PDCCH that carries described RNTI in detection,, receive the RRC signaling of carrying system message by described PDSCH in the time domain and/or the frequency domain resource position of this PDCCH indication.
Referring to Fig. 7, the embodiment of the invention also provides a kind of base station, can be applied in the above-mentioned wireless communication system, and this base station comprises:
Described time transmitting element 71 comprises:
First carries the unit, is used for system time is carried at the predefined MAC CE that is used for system time broadcasting;
First transmitting element is used for sending described MAC CE by PDSCH to terminal.
Described time transmitting element 71 comprises:
Second carries the unit, is used for system time is carried at the RRC signaling;
Second transmitting element is used for sending described RRC signaling by PDSCH to terminal.
Described time transmitting element 71 is used for:
At fixing descending sub frame, by described PDSCH to the terminal transmitting system time; Perhaps,
In predefined scheduling time that comprises a plurality of descending sub frames in the window, by described PDSCH to the terminal transmitting system time.
Described base station also comprises:
The time granularity of described system time is 1 millisecond.Described system time is: send first subframe time corresponding in the subframe place radio frames of described system time; Perhaps, the subframe time corresponding in other radio frames except that described radio frames; Perhaps, send the subframe time corresponding of described system time.
Referring to Fig. 8, the embodiment of the invention also provides a kind of terminal, can be applied in the above-mentioned wireless communication system, and this terminal comprises:
Time calibration, the unit 81, be used for according to described system time the terminal local zone time being calibrated, and calibration back terminal local zone time kept synchronous with system time.
Described time receiving element 80 is used for:
Receive MAC CE or the RRC signaling that send the base station at described PDSCH, from this MAC CE or do not have and read described system time the RRC signaling.
Described time receiving element 80 is used for:
At fixing descending sub frame, receive the system time that described base station sends by described PDSCH; Perhaps,
In predefined scheduling time that comprises a plurality of descending sub frames in the window, receive the system time that described base station sends continuously by described PDSCH.
Described time receiving element 80 is used for:
After receiving the PDCCH that carries RNTI,, receive the RRC signaling of carrying system message by described PDSCH in the time domain and/or the frequency domain resource position of this PDCCH indication; Described RNTI is predefined RNTI or the described LTE existing RNTI of system that is used for system time broadcasting.
This terminal also comprises:
Time reports unit 82, is used for after described time calibration, the unit was calibrated the terminal local zone time, at report measurement information, or during turkey, current terminal local zone time is reported the base station.
To sum up, beneficial effect of the present invention comprises:
In the scheme that the embodiment of the invention provides, the physical channel of this base station and terminal room is passed through to the terminal transmitting system time in the base station, terminal receives the system time that the base station sends at this physical channel, according to this system time the terminal local zone time is calibrated, and calibration back terminal local zone time keeps synchronous with system time.As seen, adopt the present invention, do not need the requirement terminal to possess the GPS function, also do not need to increase or change terminal and ntp server carries out mutual flow process, it is synchronous that the terminal of any connecting system all can obtain the system time line time of going forward side by side; Do not exist the NTP system crash to cause terminal can't obtain system time and then can't synchronous problem of deadline yet, make acquisition system system time that terminal can be reliable, easy and realize with system time synchronously.
And, after terminal local zone time and system time are synchronous, terminal reports relevant metrical information, or the turkey of correspondence failure noted give the correct time on carrying out then, can make network side can utilize correct temporal information to carry out the network optimization comparatively accurately with together reporting network side with the synchronous terminal local zone time of system time.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (22)
1. a method for synchronizing time is characterized in that, this method comprises:
The physical channel of this base station and terminal room is passed through to the terminal transmitting system time in the base station;
Terminal receives the system time that described base station sends at described physical channel, according to this system time the terminal local zone time is calibrated, and makes that calibration back terminal local zone time and system time are synchronous.
2. the method for claim 1 is characterized in that, Physical Downlink Shared Channel PDSCH is passed through to the terminal transmitting system time in described base station.
3. method as claimed in claim 2 is characterized in that, described base station comprises to the terminal transmitting system time by PDSCH:
Described base station is carried at the predefined media access control layer that is used for system time broadcasting with system time and inserts indication information element MAC CE at random, and sends described MAC CE by PDSCH to terminal; Perhaps,
Described base station is carried at system time in the radio resource control RRC signaling, and sends described RRC signaling by PDSCH to terminal.
4. method as claimed in claim 2 is characterized in that, described base station comprises to the terminal transmitting system time by PDSCH:
Described base station is at fixing descending sub frame, by described PDSCH to the terminal transmitting system time;
Described terminal comprises at the system time that described PDSCH receives the transmission of described base station:
Described terminal receives the system time that described base station sends at described descending sub frame by described PDSCH.
5. method as claimed in claim 2 is characterized in that, described base station comprises to the terminal transmitting system time by PDSCH:
Described base station is in predefined scheduling time that comprises a plurality of descending sub frames in the window, by described PDSCH to the terminal transmitting system time;
Described terminal comprises at the system time that described PDSCH receives the transmission of described base station:
Described terminal receives the system time that described base station sends continuously by described PDSCH in described scheduling time window.
6. method as claimed in claim 3 is characterized in that, in described base station by PDSCH before terminal sends described RRC signaling, this method further comprises:
Described base station utilizes the physical downlink control channel PDCCH of carrying Radio Network Temporary Identifier RNTI to dispatch described PDSCH; Described RNTI is predefined RNTI or the described LTE existing RNTI of system that is used for system time broadcasting;
Described terminal comprises at the system time that described PDSCH receives the transmission of described base station:
After described terminal receives the PDCCH that carries described RNTI in detection,, receive the RRC signaling of carrying system message by described PDSCH in the time domain and/or the frequency domain resource position of this PDCCH indication.
7. as arbitrary described method among the claim 1-6, it is characterized in that the time granularity of described system time is 1 millisecond.
8. method as claimed in claim 7 is characterized in that, described system time is:
Send first subframe time corresponding in the subframe place radio frames of described system time; Perhaps,
Subframe time corresponding in other radio frames except that described radio frames; Perhaps,
Send the subframe time corresponding of described system time.
9. a wireless communication system is characterized in that, this system comprises:
The base station was used for by the physical channel between this base station and the terminal to the terminal transmitting system time;
Terminal is used for receiving the system time that described base station sends at described physical channel, according to this system time the terminal local zone time is calibrated, and calibration back terminal local zone time keeps synchronous with system time.
10. system as claimed in claim 9 is characterized in that, described base station is used for:
System time is carried at the predefined MAC CE that is used for system time broadcasting, and sends described MAC CE to terminal by Physical Downlink Shared Channel PDSCH; Perhaps,
System time is carried in the radio resource control RRC signaling, and sends described RRC signaling to terminal by PDSCH.
11., it is characterized in that described base station is used for as claim 9 or 10 described systems:
At fixing descending sub frame, by Physical Downlink Shared Channel PDSCH to the terminal transmitting system time;
Described terminal is used for:
At described descending sub frame, receive the system time that described base station sends by described PDSCH.
12., it is characterized in that described base station is used for as claim 9 or 10 described systems:
In predefined scheduling time that comprises a plurality of descending sub frames in the window, by Physical Downlink Shared Channel PDSCH to the terminal transmitting system time;
Described terminal is used for:
In described scheduling time window, receive the system time that described base station sends continuously by described PDSCH.
13. system as claimed in claim 10 is characterized in that, described base station also is used for:
Send described RRC signaling to terminal before, utilize the physical downlink control channel PDCCH of carrying Radio Network Temporary Identifier RNTI to dispatch described PDSCH; Described RNTI is predefined RNTI or the described LTE existing RNTI of system that is used for system time broadcasting;
Described terminal is used for:
After receiving the PDCCH that carries described RNTI in detection,, receive the RRC signaling of carrying system message by described PDSCH in the time domain and/or the frequency domain resource position of this PDCCH indication.
14. a base station is characterized in that, this base station comprises:
Time acquisition unit is used to obtain the system time of this place, base station communication system;
The time transmitting element is used for sending described system time by the physical channel of this base station and terminal room to terminal.
15. base station as claimed in claim 14 is characterized in that, described time transmitting element comprises:
First carries the unit, is used for system time is carried at the predefined MAC CE that is used for system time broadcasting;
First transmitting element is used for sending described MAC CE by Physical Downlink Shared Channel PPDSCH to terminal.
16. base station as claimed in claim 14 is characterized in that, described time transmitting element comprises:
Second carries the unit, is used for system time is carried at the radio resource control RRC signaling;
Second transmitting element is used for sending described RRC signaling by Physical Downlink Shared Channel PDSCH to terminal.
17., it is characterized in that described time transmitting element is used for as arbitrary described base station among the claim 14-16:
At fixing descending sub frame, by Physical Downlink Shared Channel PDSCH to the terminal transmitting system time; Perhaps,
In predefined scheduling time that comprises a plurality of descending sub frames in the window, by described PDSCH to the terminal transmitting system time.
18. base station as claimed in claim 16 is characterized in that, described base station also comprises:
Scheduling unit was used for send described RRC signaling to terminal before, utilized the physical downlink control channel PDCCH of carrying Radio Network Temporary Identifier RNTI to dispatch described PDSCH; Described RNTI is predefined RNTI or the described LTE existing RNTI of system that is used for system time broadcasting, receives the RRC signaling of carrying system message to indicate described terminal in the time domain and/or the frequency domain resource position of described PDCCH indication.
19. a terminal is characterized in that, this terminal comprises:
The time receiving element, the physical channel that is used between this terminal and base station receives the system time that send the base station;
Time calibration, the unit was used for according to described system time the terminal local zone time being calibrated, and calibration back terminal local zone time keeps synchronous with system time.
20. terminal as claimed in claim 19 is characterized in that, described time receiving element is used for:
Receive MAC CE or the radio resource control RRC signaling that send the base station at Physical Downlink Shared Channel PDSCH, from this MAC CE or do not have and read described system time the RRC signaling.
21., it is characterized in that described time receiving element is used for as claim 19 or 20 described terminals:
At fixing descending sub frame, receive the system time that described base station sends by Physical Downlink Shared Channel PDSCH; Perhaps,
In predefined scheduling time that comprises a plurality of descending sub frames in the window, receive the system time that described base station sends continuously by Physical Downlink Shared Channel PDSCH.
22. terminal as claimed in claim 20 is characterized in that, described time receiving element is used for:
After receiving the PDCCH that carries Radio Network Temporary Identifier RNTI in detection,, receive the RRC signaling of carrying system message by described PDSCH in the time domain and/or the frequency domain resource position of this PDCCH indication; Described RNTI is predefined RNTI or the described LTE existing RNTI of system that is used for system time broadcasting.
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| CN103796296B (en) * | 2012-11-02 | 2018-05-08 | 中国移动通信集团公司 | Method for synchronizing time, user equipment and base station in long evolving system |
| CN105188128B (en) * | 2015-08-21 | 2018-10-16 | 北京北方烽火科技有限公司 | A kind of wireless time service and air interface synchronization method, base station, communication apparatus and system |
| CN110167130A (en) * | 2018-02-13 | 2019-08-23 | 华为技术有限公司 | A kind of transmission method and device of temporal information |
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| WO2021072442A1 (en) * | 2019-10-10 | 2021-04-15 | Qualcomm Incorporated | Medium access control (mac) control element handling for multicast or broadcast operation |
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