CN102056284A - Time synchronization method, system and device - Google Patents
Time synchronization method, system and device Download PDFInfo
- Publication number
- 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
- Authority
- CN
- China
- Prior art keywords
- terminal
- time
- base station
- system time
- pdsch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 37
- 230000001360 synchronised effect Effects 0.000 claims abstract description 15
- 238000004891 communication Methods 0.000 claims abstract description 11
- 230000011664 signaling Effects 0.000 claims description 39
- 230000005540 biological transmission Effects 0.000 claims description 10
- 238000005259 measurement Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 7
- 230000003993 interaction Effects 0.000 description 5
- 238000013507 mapping Methods 0.000 description 4
- 238000005457 optimization Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 230000000153 supplemental effect Effects 0.000 description 2
- 101150005409 Pmch gene Proteins 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Landscapes
- Mobile Radio Communication Systems (AREA)
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 the field of wireless communications technologies, and in particular, to a time synchronization method, system, and device.
Background
In a Long Term Evolution (LTE) system, how to reduce the workload of an operator in networking and network Optimization has been discussed, so a self-Optimization network (SON) project and a Minimization Drive Test (MDT) project have been introduced.
The mapping from the downlink transport channel to the physical channel in the existing LTE system is shown in fig. 1, and the mapping from the uplink transport channel to the physical channel is shown in fig. 2, where:
pbch (physical broadcast channel) is a physical broadcast channel, and is used for carrying information of MIB in broadcast messages. A pcfich (physical control format indicator channel) is a physical control format indicator channel, which is used to indicate that there are several OFDM symbols in each subframe for use by control symbols. A PDCCH (physical downlink control channel) is a physical downlink control channel, and indicates information such as time-frequency resources, coding modes and the like of the PDSCH or PUSCH through the PDCCH. A phich (physical Hybrid ARQ Indicator channel) is used to carry downlink HARQ feedback information for uplink transmission. Pdsch (physical downlink shared channel) is a physical downlink shared channel. Pmch (physical multicast channel) is a physical multicast channel. A pucch (physical uplink control channel) is a physical uplink control channel and is used to carry uplink HARQ feedback information, scheduling request information (SR), CQI report information, and the like for downlink transmission. 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, MCH is a multicast channel, PCH is a paging channel, DL-SCH is a downlink supplemental channel, UL-SCH is an uplink supplemental channel, and RACH is a random access channel.
The idea of MDT in LTE is that a terminal (UE) reports relevant measurement information, or records a failure event corresponding to a failure and then reports the failure event to the network side. The UE also needs to keep the time when recording the measurement information and the failure event, and then carry the time together to assist the network in network optimization.
The current UE measurement quantities include: periodic downlink pilot measurements (periodic downlink pilot measurements), Serving Cell less than set threshold (Serving Cell less than threshold), PHR (Transmit power less than set threshold), Random access Failure (Random access Failure), Paging Channel reception Failure (Paging Channel Failure), and Broadcast Channel reception Failure (Broadcast Channel Failure).
In the six UE measurement quantities, only item 4 does not need to report the time information of the event, and other 5 items all need to report the time information of the event.
For example, the parameters to be reported by the UE for reporting the first period downlink pilot measurements (periodic downlink pilot measurements) are shown in the following table:
it can be seen that the time information of the UE and the network side is very important for MDT, and at present, two methods for ensuring the time of the UE and the network side to be consistent are specifically:
the first method comprises the following steps: the GPS system.
Through Global Positioning System (GPS) calibration, the UE with GPS function can receive the time signal on GPS, and the time calibration ensures that the time of the UE is consistent with the maintenance of the network side.
And the second method comprises the following steps: a time server.
The method directly utilizes the terminal and the time server to carry out interaction through an application layer protocol to obtain the time information. When a specific condition (such as client starting) is met, the terminal initiates a time request to an NTP server at the network side, extracts time information in the response message, and ensures that the terminal time is basically consistent with the network side time according to a time increment provided by a local timer.
In the process of implementing the invention, the inventor finds that the following technical problems exist in the prior art:
there are two problems with GPS calibration:
firstly, the method comprises the following steps: GPS is not an essential requirement for UE, and UE without GPS function cannot adopt GPS method to calibrate time;
secondly, the method comprises the following steps: even if the UE has the GPS function, it cannot be guaranteed that the UE can receive the time signal on the GPS, for example, the UE is difficult to receive the satellite signal indoors.
The time server method has the following disadvantages:
because the interaction link between the newly added terminal and the network needs to be established, a complete process of interaction between the terminal and the NTP server needs to be established;
the NTP server can face the terminal on the basis of meeting the time synchronization requirement of a network side, and due to the fact that the number of the terminals is large, if a large number of terminals need to communicate with the server frequently, the impact on the server is large, and if too many users and network equipment (such as base stations) which require access in the same time are too many, the NTP system can be crashed;
the expandability is weak, and if a non-NTP server is adopted to provide time information subsequently, the terminal and the corresponding flow need to be modified;
the robustness is poor, the reliability of the time server can become the bottleneck of the reliability of the whole network, and once the server is broken down due to the increase of the number of users, other network equipment cannot obtain time synchronization.
Disclosure of Invention
The embodiment of the invention provides a time synchronization method, a system and equipment, which are used for providing a reliable and simple scheme for a terminal to acquire system time and carry out time calibration by using the system time.
A method of time synchronization, the method comprising:
a base station sends system time to a terminal through a Physical Downlink Shared Channel (PDSCH);
and the terminal receives the system time sent by the base station on the PDSCH, calibrates the local time of the terminal according to the system time, and keeps the local time of the terminal synchronized with the system time after calibration.
A wireless communication system, the system comprising:
the base station is used for sending the system time to the terminal through a Physical Downlink Shared Channel (PDSCH);
and the terminal is used for receiving the system time sent by the base station at the PDSCH, calibrating the local time of the terminal according to the system time, and keeping the local time of the terminal and the system time synchronized after calibration.
A base station, the base station comprising:
the time acquisition unit is used for acquiring the system time of a communication system where the base station is located;
and the time transmitting unit is used for transmitting the system time to the terminal through a Physical Downlink Shared Channel (PDSCH).
A terminal, the terminal comprising:
a time receiving unit, configured to receive, at a PDSCH (physical downlink shared channel), system time sent by a base station;
and the time calibration unit is used for calibrating the local time of the terminal according to the system time, and the calibrated local time of the terminal keeps synchronous with the system time.
In the invention, the base station sends the system time to the terminal through the PDSCH, the terminal receives the system time sent by the base station at the PDSCH, the local time of the terminal is calibrated according to the system time, and the local time of the terminal and the system time are kept synchronous after calibration. Therefore, by adopting the invention, the terminal does not need to have the GPS function, and the process of interaction between the terminal and the NTP server does not need to be added or changed, and any terminal accessing the system can obtain the system time and carry out time synchronization; the problem that the terminal cannot obtain the system time and further cannot complete time synchronization due to NTP system breakdown is solved, so that the terminal can reliably and simply obtain the system time and realize the synchronization with the system time.
Drawings
Fig. 1 is a schematic diagram illustrating a mapping between a downlink transport channel and a downlink physical channel in the prior art;
fig. 2 is a diagram illustrating mapping between an uplink transport channel and an uplink physical channel in the prior art;
FIG. 3 is a schematic flow chart of a method provided by an embodiment of the present invention;
FIG. 4 is a schematic diagram of system time transmission in an embodiment of the present invention;
FIG. 5 is a diagram illustrating a format of a MAC CE according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a system according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a base station according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a terminal according to an embodiment of the present invention.
Detailed Description
In order to provide a reliable and simple scheme for a terminal to obtain system time and perform time calibration by using the system time, an embodiment of the invention provides a time synchronization method.
The physical channel in the present invention may be a PDSCH in the LTE system, or may be a physical channel with a system information transmission function between any other base station and the terminal. In the following, the system time transmitted to the terminal by the PDSCH will be described as an example.
Referring to fig. 3, the time synchronization method in the LTE system provided by the embodiment of the present invention specifically includes the following steps:
step 30: a base station transmits system time to a terminal through a Physical Downlink Shared Channel (PDSCH);
step 31: and the terminal receives the system time sent by the base station on the PDSCH, calibrates the local time of the terminal according to the system time, and keeps the local time of the terminal synchronized with the system time after calibration.
In step 30, the base station sends the system time to the terminal through the PDSCH, which may specifically adopt the following improved manner:
first, the base station first carries the system time in a random access indication cell (MAC CE) of a media access control layer predefined for system time broadcasting, and transmits the MAC CE to the terminal through the PDSCH.
Second, the base station first carries the system time in Radio Resource Control (RRC) signaling, and transmits the RRC signaling to the terminal through the PDSCH.
For the two modes, the base station can send the system time to the terminal through the PDSCH in a fixed downlink subframe; correspondingly, the terminal receives the system time sent by the base station through the PDSCH in the fixed downlink subframe.
The base station can also send the system time to the terminal through the PDSCH in a preset scheduling time window containing a plurality of downlink subframes; correspondingly, the terminal continuously receives the system time sent by the base station through the PDSCH in the scheduling time window.
Preferably, when the second system time transmission method is adopted, the base station may schedule the terminal to receive time domain and/or frequency domain resources of the system time through the PDCCH before transmitting the RRC signaling to the terminal through the PDSCH. Specifically, a base station schedules a PDSCH carrying system time by using a Physical Downlink Control Channel (PDCCH) carrying a Radio Network Temporary Identifier (RNTI); the RNTI is a predefined RNTI used for system time broadcasting or an existing RNTI in an LTE system; and after detecting and receiving the PDCCH carrying the RNTI, the terminal receives RRC signaling carrying system messages through the PDSCH at the time domain and/or frequency domain resource position indicated by the PDCCH.
Of course, if the PDCCH does not schedule the time domain resource of the terminal receiving the system time, the terminal receives the system time on the PDSCH at the preset fixed time domain position; if the PDCCH does not schedule the terminal to receive the frequency domain resource of the system time, the terminal receives the system time on the PDSCH at a preset fixed frequency domain position.
After the terminal calibrates the terminal local time according to the received system time, if the measurement information or the failure event needs to be reported, the current terminal local time and the measurement information or the failure event are reported to the network side.
In the present invention, the time granularity of the system time may be 1 millisecond. The system time may specifically be: sending the time corresponding to the first subframe in the wireless frame where the subframe of the system time is located; or the time corresponding to the sub-frame in other radio frames except the radio frame; or sending the time corresponding to the sub-frame of the system time. The system time in the present invention refers to the network side time of the communication system in which the base station is located.
The present invention is described in detail below:
in the invention, the PDSCH of the LTE system is used for sending system time, the PDSCH channel is scheduled through the PDCCH, and the PDSCH can carry broadcast messages.
Note that: the system time information issued by the network side is used by the terminal to synchronize with the network equipment, and is not equal to the application layer time information and the clock facing the user on the mobile phone. Of course the terminal can use this time to calibrate the time of the user application layer at the same time.
In the invention, the system time can be the time for sending the first subframe of the wireless frame or the time for sending the subframe carrying the system time. The temporal granularity may be 1 ms. But of course also the time of a certain subframe with respect to a certain radio frame. Fig. 4 shows the transmission time of a subframe carrying the system time.
It is assumed that the system time is carried in SFN ═ 0 radio frames and SFN ═ 512 frames, respectively. The SFN is a system frame number.
If the system time delivered at SFN ═ 0 is 10 o 'clock 6 min 10 sec 100 msec in 2009, 2/month 16, the system time delivered at SFN ═ 512 frame is 10 o' clock 6 min 15 sec 220 msec in 2009, 2/month 16.
If the UE receives the system time delivered by the network side at SFN ═ 0, the UE can directly maintain its clock by 10 o, 6 o, 10 s, 100 ms at No. 2/16 in 2009. For example, the clock may be set to 10 o 'clock, 16 o' clock, 6 min, 10 sec, 300 ms after 20 frames in 2009.
The network side carries the system time on the PDSCH to send, and the system time may be carried in the MACCE, or may be carried by using an RRC message, specifically as follows:
the first method is as follows: the mode of MAC CE is adopted.
In this way, a new MAC CE needs to be added, and the logical channel number (LCID) field needs to be expanded first. As shown in the following table, the MAC CE carrying LCID 11001 may be extended to be a MAC CE for system time broadcast (time broadcast).
The specific MAC CE design can be as shown in fig. 5, and how many bytes the specific system time information occupies needs to be determined according to the granularity of the system time information.
The second method comprises the following steps: and carrying system time information by adopting RRC signaling.
An Information Element (IE) is added in the RRC setup procedure to inform the terminal of system time information.
This approach requires a new addition of RNTI. The physical layer identifies the subsequently scheduled PDSCH by RNTI on the PDCCH, which is specifically that type of information. For example, broadcast messages are scheduled by SI-RNTI and paging messages are scheduled by P-RNTI. We can add a new T-RNTI to schedule the time information.
Certainly, the information carried by the P-RNTI can be expanded, so that the Paging information carries time information. I.e. no new RNTI is added.
The method for carrying the system time by using the MAC CE and the RRC message is given above, and for the two modes, the issuing time also needs to be specified so as to facilitate the monitoring of the UE.
One way may be a fixed location way, i.e., the subframe of the transmit system time is fixed, so that the UE can receive the system time at a fixed time.
Another way may be to set a scheduling time window. Namely, a scheduling time window is designed, and the UE receives the system time in the scheduling time window, so that certain scheduling flexibility can be ensured.
The invention is illustrated below in specific examples:
the first embodiment is as follows:
in this embodiment, the base station issues the system time to the terminal at a fixed time through the MAC CE, and the terminal receives the system time issued by the base station at the fixed time, which is specifically as follows:
step S01: the base station sends the MAC CE carrying the system time to the terminal through the PDSCH in the first downlink subframe of the wireless frame with the SFN being 0;
step S02: the terminal monitors PDSCH in a first downlink subframe of a wireless frame with SFN (SFN) -0, and reads system time in an MAC CE (media access control) carried by the monitored PDSCH;
step S03: and the terminal maintains the local clock by using the read system time.
Example two:
in this embodiment, the base station continuously sends the system time to the terminal through the MACCE within a set scheduling time window including 3 downlink subframes, and the terminal continuously receives the system time issued by the base station within the scheduling time window, which is specifically as follows:
step S11: the base station sends MAC CEs carrying system time to the terminal through PDSCH in a first downlink subframe, a second downlink subframe and a third downlink subframe of a wireless frame;
step S12: the terminal monitors PDSCH continuously in the first, second and third downlink subframes of the wireless frame, and reads the system time in the MAC CE carried by the PDSCH monitored in the first, second and third downlink subframes of the wireless frame;
step S13: and the terminal maintains the local clock by using the read system time.
Example three:
in this embodiment, the base station issues the system time to the terminal through the RRC signaling at a fixed time, and schedules the terminal through the PDCCH before sending the RRC signaling to receive the frequency domain resource of the PDSCH, and the terminal receives the system time issued by the base station at the fixed time and at the frequency domain position indicated by the PDCCH, which is specifically as follows:
step S21: a base station sends a PDCCH scrambled by a predefined T-RNTI to a terminal, and the PDCCH carries frequency domain resource position information of system time received by the terminal;
step S22: a base station sends RRC signaling carrying system information to a terminal through a PDSCH in a first downlink subframe in a first radio frame after sending a PDCCH;
step S23: after detecting and receiving a PDDCH carrying T-RNTI, a terminal receives system time in an RRC signaling sent by a base station at a first downlink subframe of a first radio frame after receiving a PDCCH and a frequency domain position indicated by the PDCCH;
step S24: and the terminal maintains the local clock by using the read system time.
Example four:
in this embodiment, the base station issues the system time to the terminal through the RRC signaling in the set scheduling time window, and schedules the terminal through the PDCCH before sending the RRC signaling to receive the frequency domain resource of the PDSCH, and the terminal receives the system time issued by the base station in the frequency domain position indicated by the PDCCH in the scheduling time window, which is specifically as follows:
step S31: a base station sends a PDCCH scrambled by a predefined T-RNTI to a terminal, and the PDCCH carries frequency domain resource position information of system time received by the terminal;
step S32: the base station sends the first, second and third downlink subframes of the first radio frame after the PDCCH, and sends RRC signaling carrying system time to the terminal through the PDSCH;
step S33: after detecting and receiving a PDDCH carrying T-RNTI, the terminal continuously receives system time in RRC signaling sent by the base station at the frequency domain position indicated by a PDCCH and at the first, second and third downlink subframes of the first radio frame after receiving the PDCCH;
step S34: and the terminal maintains the local clock by using the read system time.
Referring to fig. 6, an embodiment of the present invention further provides a wireless communication system, where the system includes:
a base station 60 for transmitting the system time to the terminal through the PDSCH;
and the terminal 61 is configured to calibrate the terminal local time according to the system time when the PDSCH receives the system time sent by the base station, and the calibrated terminal local time and the system time are kept synchronous.
The base station 60 is configured to:
the inter-carrier is carried in a predefined MAC CE for system time broadcasting, and the MAC CE is transmitted to a terminal through a PDSCH.
The base station 60 is configured to:
and carrying the system time in RRC signaling, and sending the RRC signaling to the terminal through the PDSCH.
The base station 60 is configured to:
in a fixed downlink subframe, transmitting system time to a terminal through the PDSCH;
accordingly, the terminal 61 is configured to:
and receiving the system time sent by the base station through the PDSCH in the downlink subframe.
The base station 60 is configured to:
sending system time to a terminal through the PDSCH in a preset scheduling time window containing a plurality of downlink subframes;
accordingly, the terminal 61 is configured to:
and continuously receiving the system time sent by the base station through the PDSCH in the scheduling time window.
The base station 60 is further configured to:
before the RRC signaling is sent to a terminal, the PDSCH is scheduled by using a physical downlink control channel PDCCH carrying RNTI; the RNTI is a predefined RNTI used for system time broadcasting or an existing RNTI in the LTE system;
accordingly, the terminal 61 is configured to:
and after the PDCCH carrying the RNTI is detected and received, the RRC signaling carrying the system message is received through the PDSCH at the time domain and/or frequency domain resource position indicated by the PDCCH.
Referring to fig. 7, an embodiment of the present invention further provides a base station, which may be applied in the foregoing wireless communication system, where the base station includes:
a time acquiring unit 70, configured to acquire a system time of a communication system in which the base station is located;
a time transmitting unit 71, configured to transmit the system time to the terminal through the PDSCH.
The time transmission unit 71 includes:
a first carrying unit, configured to carry the system time in a predefined MAC CE for system time broadcasting;
a first transmitting unit, configured to transmit the MAC CE to a terminal through a PDSCH.
The time transmission unit 71 includes:
a second carrying unit, configured to carry the system time in RRC signaling;
and a second transmitting unit, configured to transmit the RRC signaling to the terminal through the PDSCH.
The time transmitting unit 71 is configured to:
in a fixed downlink subframe, transmitting system time to a terminal through the PDSCH; or,
and transmitting the system time to the terminal through the PDSCH in a preset scheduling time window comprising a plurality of downlink subframes.
The base station further comprises:
a scheduling unit 72, configured to schedule the PDSCH by using a physical downlink control channel PDCCH carrying an RNTI before sending the RRC signaling to the terminal; the RNTI is a predefined RNTI used for system time broadcasting or an existing RNTI in the LTE system so as to indicate the terminal to receive RRC signaling carrying system messages at a time domain and/or frequency domain resource position indicated by the PDCCH.
The time granularity of the system time is 1 millisecond. The system time is as follows: sending the time corresponding to the first subframe in the wireless frame where the subframe of the system time is located; or the time corresponding to the sub-frame in other radio frames except the radio frame; or sending the time corresponding to the sub-frame of the system time.
Referring to fig. 8, an embodiment of the present invention further provides a terminal, which may be applied to the foregoing wireless communication system, where the terminal includes:
a time receiving unit 80 configured to receive a system time transmitted from a base station on the PDSCH;
and the time calibration unit 81 is configured to calibrate the terminal local time according to the system time, and the calibrated terminal local time and the system time are kept synchronous.
The time receiving unit 80 is configured to:
and receiving MAC CE or RRC signaling sent by the base station at the PDSCH, and reading the system time from the MAC CE or no RRC signaling.
The time receiving unit 80 is configured to:
receiving the system time sent by the base station through the PDSCH in a fixed downlink subframe; or,
and continuously receiving the system time transmitted by the base station through the PDSCH in a preset scheduling time window comprising a plurality of downlink subframes.
The time receiving unit 80 is configured to:
after receiving the PDCCH carrying the RNTI, receiving RRC signaling carrying system messages through the PDSCH at a time domain and/or frequency domain resource position indicated by the PDCCH; the RNTI is a predefined RNTI used for system time broadcasting or an existing RNTI in the LTE system.
The terminal further includes:
and a time reporting unit 82, configured to report the current local time of the terminal to the base station when the measurement information or a failure event is reported after the time calibration unit calibrates the local time of the terminal.
In conclusion, the beneficial effects of the invention include:
in the scheme provided by the embodiment of the invention, the base station sends the system time to the terminal through the physical channel between the base station and the terminal, the terminal receives the system time sent by the base station in the physical channel, the local time of the terminal is calibrated according to the system time, and the local time of the terminal and the system time are kept synchronous after the terminal is calibrated. Therefore, by adopting the invention, the terminal does not need to have the GPS function, and the process of interaction between the terminal and the NTP server does not need to be added or changed, and any terminal accessing the system can obtain the system time and carry out time synchronization; the problem that the terminal cannot obtain the system time and further cannot complete time synchronization due to NTP system breakdown is solved, so that the terminal can reliably and simply obtain the system time and realize the synchronization with the system time.
And after the local time of the terminal is synchronized with the system time, the terminal reports the related measurement information, or records the failure event corresponding to the failure and then reports the failure event, so that the local time of the terminal synchronized with the system time can be reported to the network side together, and the network side can perform more accurate network optimization by using correct time information.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (22)
1. A method of time synchronization, the method comprising:
the base station sends system time to the terminal through a physical channel between the base station and the terminal;
and the terminal receives the system time sent by the base station in the physical channel, and calibrates the local time of the terminal according to the system time, so that the calibrated local time of the terminal is synchronous with the system time.
2. The method of claim 1, wherein the base station transmits the system time to the terminal through a Physical Downlink Shared Channel (PDSCH).
3. The method of claim 2, wherein the base station transmitting the system time to the terminal through the PDSCH comprises:
the base station carries the system time in a predefined media access control layer random access indication cell MAC CE for system time broadcasting, and sends the MAC CE to a terminal through a PDSCH; or,
and the base station carries the system time in a Radio Resource Control (RRC) signaling and sends the RRC signaling to the terminal through the PDSCH.
4. The method of claim 2, wherein the base station transmitting the system time to the terminal through the PDSCH comprises:
the base station sends system time to a terminal through the PDSCH in a fixed downlink subframe;
the terminal receives the system time sent by the base station in the PDSCH and comprises the following steps:
and the terminal receives the system time sent by the base station through the PDSCH in the downlink subframe.
5. The method of claim 2, wherein the base station transmitting the system time to the terminal through the PDSCH comprises:
the base station sends system time to a terminal through the PDSCH in a preset scheduling time window containing a plurality of downlink subframes;
the terminal receives the system time sent by the base station in the PDSCH and comprises the following steps:
and the terminal continuously receives the system time sent by the base station through the PDSCH in the scheduling time window.
6. The method of claim 3, wherein before the base station transmits the RRC signaling to a terminal through a PDSCH, the method further comprises:
the base station schedules the PDSCH by using a physical downlink control channel PDCCH carrying a radio network temporary identifier RNTI; the RNTI is a predefined RNTI used for system time broadcasting or an existing RNTI in the LTE system;
the terminal receives the system time sent by the base station in the PDSCH and comprises the following steps:
and after detecting and receiving the PDCCH carrying the RNTI, the terminal receives RRC signaling carrying system messages through the PDSCH at the time domain and/or frequency domain resource position indicated by the PDCCH.
7. The method of any of claims 1-6, wherein the system time has a time granularity of 1 millisecond.
8. The method of claim 7, wherein the system time is:
sending the time corresponding to the first subframe in the wireless frame where the subframe of the system time is located; or,
time corresponding to subframes in other radio frames except the radio frame; or,
and sending the time corresponding to the sub-frame of the system time.
9. A wireless communication system, comprising:
the base station is used for sending the system time to the terminal through a physical channel between the base station and the terminal;
and the terminal is used for receiving the system time sent by the base station in the physical channel, calibrating the local time of the terminal according to the system time, and keeping the local time of the terminal and the system time synchronized after calibration.
10. The system of claim 9, wherein the base station is configured to:
carrying system time in a predefined MAC CE for system time broadcasting, and sending the MAC CE to a terminal through a Physical Downlink Shared Channel (PDSCH); or,
and carrying the system time in a Radio Resource Control (RRC) signaling, and sending the RRC signaling to the terminal through the PDSCH.
11. The system of claim 9 or 10, wherein the base station is configured to:
in a fixed downlink subframe, transmitting system time to a terminal through a Physical Downlink Shared Channel (PDSCH);
the terminal is used for:
and receiving the system time sent by the base station through the PDSCH in the downlink subframe.
12. The system of claim 9 or 10, wherein the base station is configured to:
in a preset scheduling time window comprising a plurality of downlink subframes, sending system time to a terminal through a Physical Downlink Shared Channel (PDSCH);
the terminal is used for:
and continuously receiving the system time sent by the base station through the PDSCH in the scheduling time window.
13. The system of claim 10, wherein the base station is further configured to:
before the RRC signaling is sent to a terminal, the PDSCH is scheduled by using a physical downlink control channel PDCCH carrying a radio network temporary identifier RNTI; the RNTI is a predefined RNTI used for system time broadcasting or an existing RNTI in the LTE system;
the terminal is used for:
and after the PDCCH carrying the RNTI is detected and received, the RRC signaling carrying the system message is received through the PDSCH at the time domain and/or frequency domain resource position indicated by the PDCCH.
14. A base station, comprising:
the time acquisition unit is used for acquiring the system time of a communication system where the base station is located;
and the time sending unit is used for sending the system time to the terminal through a physical channel between the base station and the terminal.
15. The base station of claim 14, wherein the time transmission unit comprises:
a first carrying unit, configured to carry the system time in a predefined MAC CE for system time broadcasting;
and the first sending unit is used for sending the MAC CE to the terminal through a physical downlink shared channel PPDSCH.
16. The base station of claim 14, wherein the time transmission unit comprises:
a second carrying unit, configured to carry the system time in a radio resource control RRC signaling;
and a second sending unit, configured to send the RRC signaling to the terminal through a physical downlink shared channel PDSCH.
17. The base station according to any of claims 14-16, wherein the time transmitting unit is configured to:
in a fixed downlink subframe, transmitting system time to a terminal through a Physical Downlink Shared Channel (PDSCH); or,
and transmitting the system time to the terminal through the PDSCH in a preset scheduling time window comprising a plurality of downlink subframes.
18. The base station of claim 16, wherein the base station further comprises:
a scheduling unit, configured to schedule the PDSCH by using a physical downlink control channel PDCCH carrying a radio network temporary identifier RNTI before sending the RRC signaling to the terminal; the RNTI is a predefined RNTI used for system time broadcasting or an existing RNTI in the LTE system so as to indicate the terminal to receive RRC signaling carrying system messages at a time domain and/or frequency domain resource position indicated by the PDCCH.
19. A terminal, characterized in that the terminal comprises:
a time receiving unit, configured to receive, at a physical channel between the terminal and a base station, a system time sent from the base station;
and the time calibration unit is used for calibrating the local time of the terminal according to the system time, and the calibrated local time of the terminal keeps synchronous with the system time.
20. The terminal of claim 19, wherein the time receiving unit is configured to:
and receiving MAC CE or radio resource control RRC signaling sent by the base station on a physical downlink shared channel PDSCH, and reading the system time from the MAC CE or the RRC-free signaling.
21. The terminal according to claim 19 or 20, wherein the time receiving unit is configured to:
receiving system time sent by the base station through a Physical Downlink Shared Channel (PDSCH) in a fixed downlink subframe; or,
and continuously receiving the system time sent by the base station through a Physical Downlink Shared Channel (PDSCH) in a preset scheduling time window comprising a plurality of downlink subframes.
22. The terminal of claim 20, wherein the time receiving unit is configured to:
after detecting and receiving a PDCCH carrying a Radio Network Temporary Identifier (RNTI), receiving RRC signaling carrying system messages through the PDSCH at a time domain and/or frequency domain resource position indicated by the PDCCH; the RNTI is a predefined RNTI used for system time broadcasting or an existing RNTI in the LTE system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102366492A CN102056284A (en) | 2009-10-27 | 2009-10-27 | Time synchronization method, system and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102366492A CN102056284A (en) | 2009-10-27 | 2009-10-27 | Time synchronization method, system and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102056284A true CN102056284A (en) | 2011-05-11 |
Family
ID=43960065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009102366492A Pending CN102056284A (en) | 2009-10-27 | 2009-10-27 | Time synchronization method, system and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102056284A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110831144A (en) * | 2018-08-09 | 2020-02-21 | 华为技术有限公司 | Communication method and device |
| WO2020062177A1 (en) * | 2018-09-29 | 2020-04-02 | 深圳市大疆创新科技有限公司 | Time synchronization method and device, unmanned aerial vehicle, remote control, and storage medium |
| CN111316719A (en) * | 2017-11-16 | 2020-06-19 | 华为技术有限公司 | A time synchronization method and device |
| US10813070B2 (en) | 2016-12-20 | 2020-10-20 | Huawei Technologies Co., Ltd. | Method and apparatus for determining clock time deviation between terminal and base station |
| WO2021072442A1 (en) * | 2019-10-10 | 2021-04-15 | Qualcomm Incorporated | Medium access control (mac) control element handling for multicast or broadcast operation |
| CN113260041A (en) * | 2021-07-08 | 2021-08-13 | 成都爱瑞无线科技有限公司 | Time synchronization method for wireless communication, wireless communication device, and storage medium |
| CN113678518A (en) * | 2019-04-26 | 2021-11-19 | 株式会社Ntt都科摩 | User device and radio base station |
| US11405294B2 (en) | 2018-03-22 | 2022-08-02 | Huawei Technologies Co., Ltd. | Method and apparatus for determining status of network device |
-
2009
- 2009-10-27 CN CN2009102366492A patent/CN102056284A/en active Pending
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US10813070B2 (en) | 2016-12-20 | 2020-10-20 | Huawei Technologies Co., Ltd. | Method and apparatus for determining clock time deviation between terminal and base station |
| CN111316719B (en) * | 2017-11-16 | 2022-03-29 | 华为技术有限公司 | Time synchronization method and device |
| CN111316719A (en) * | 2017-11-16 | 2020-06-19 | 华为技术有限公司 | A time synchronization method and device |
| US11310757B2 (en) | 2017-11-16 | 2022-04-19 | Huawei Technologies Co., Ltd. | Time synchronization method and apparatus |
| 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 |
| EP3745784A4 (en) * | 2018-02-13 | 2021-03-31 | Huawei Technologies Co., Ltd. | Method and apparatus for transmitting time information |
| US11405294B2 (en) | 2018-03-22 | 2022-08-02 | Huawei Technologies Co., Ltd. | Method and apparatus for determining status of network device |
| CN110831144A (en) * | 2018-08-09 | 2020-02-21 | 华为技术有限公司 | Communication method and device |
| CN110831144B (en) * | 2018-08-09 | 2021-08-13 | 华为技术有限公司 | A communication method and device |
| WO2020062177A1 (en) * | 2018-09-29 | 2020-04-02 | 深圳市大疆创新科技有限公司 | Time synchronization method and device, unmanned aerial vehicle, remote control, and storage medium |
| CN113678518A (en) * | 2019-04-26 | 2021-11-19 | 株式会社Ntt都科摩 | User device and radio base station |
| CN113678518B (en) * | 2019-04-26 | 2024-03-22 | 株式会社Ntt都科摩 | User device and radio base station |
| WO2021072442A1 (en) * | 2019-10-10 | 2021-04-15 | Qualcomm Incorporated | Medium access control (mac) control element handling for multicast or broadcast operation |
| US11832307B2 (en) | 2019-10-10 | 2023-11-28 | Qualcomm Incorporated | Medium access control (mac) control element handling for multicast or broadcast operation |
| CN113260041A (en) * | 2021-07-08 | 2021-08-13 | 成都爱瑞无线科技有限公司 | Time synchronization method for wireless communication, wireless communication device, and storage medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102056284A (en) | Time synchronization method, system and device | |
| EP2835021B1 (en) | Advanced wakeup for reception of paging configuration information | |
| EP3139684B1 (en) | User equipment and communication method | |
| KR102482789B1 (en) | Terminal equipment, base station equipment, communication systems, measurement methods and integrated circuits | |
| CN107113716B (en) | Base station and user device | |
| EP2827662B1 (en) | Method and device for resource allocation | |
| JP2021072643A (en) | Time division duplex wireless communication system | |
| JP2021108478A (en) | Terminal device and communication method | |
| JP2022543097A (en) | Radio resource configuration method and device, and storage medium | |
| CN102083194A (en) | Method, system and equipment for sending time information and synchronizing time | |
| US9756567B2 (en) | Telecommunications apparatus and methods for communicating with a first and a second type of devices | |
| WO2016133122A1 (en) | User equipment and timer control method | |
| US12149468B2 (en) | Method performed by user equipment, and user equipment | |
| CN105228240A (en) | A kind of time synchronization method, equipment and base station | |
| CN103051413B (en) | Realize the method and device that channel quality indicator (CQI) reports | |
| US20160143086A1 (en) | Telecommunications apparatus and methods | |
| EP3800849A1 (en) | Frequency offset compensation in cellular communication systems | |
| WO2015190795A1 (en) | Method for controlling timing advance for direct communication between terminals in wireless communication system, and apparatus therefor | |
| US20240154757A1 (en) | Terminal, and wireless communication method | |
| KR20170088490A (en) | Methods and apparatus for V2X communications control | |
| CN102056283A (en) | Method, system and device for time synchronization in mobile communication system | |
| CN107864482A (en) | The measurement collocation method and device of a kind of arrowband Internet of Things | |
| CN103167599B (en) | A kind of method and apparatus of synchronizing information | |
| US20190158235A1 (en) | Telecommunications apparatus and method for searching a predefined signature sequence | |
| CN104641677B (en) | Method and device for monitoring physical broadcast channel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20110511 |