CN113260041A - Time synchronization method for wireless communication, wireless communication device, and storage medium - Google Patents
Time synchronization method for wireless communication, wireless communication device, and storage medium Download PDFInfo
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Abstract
The disclosure provides a time synchronization method for wireless communication, a wireless communication device, and a storage medium. Wherein the method comprises the following steps: the first communication node calculates and sends clock correction information before the establishment of the radio resource control connection; the second communication node synchronizes a local clock based on the clock correction information. By adopting the method and the device, high-precision synchronization between the communication nodes can be realized, and the process is completed before the establishment of the radio resource control connection, so that the power consumption and the cost of the wireless communication equipment are reduced.
Description
Technical Field
The present disclosure relates to the field of communications, and in particular, to a time synchronization method for wireless communication, a wireless communication device, and a storage medium.
Background
Air interface synchronization between wireless stations is a basic requirement for wireless station deployment, and aims to enable base stations to cooperatively complete complex operations such as cell selection, cell reselection, inter-cell switching, load balancing, interference coordination and the like. According to the requirements of 3GPP, the air interface synchronization between base stations is divided into frequency synchronization and phase synchronization. For different systems and technologies of wireless communication, the requirement of air interface synchronization between base stationsThe difference is made. For example, for the 5G NR technique, a common frequency synchronization requirement is 0.05 ppm (10 parts per million)-6) The synchronization requirement for phase synchronization is ± 1.5 microseconds. For 5G NR MIMO (Multiple Input Multiple Output) technology, the required phase synchronization accuracy is ± 65 nanoseconds.
Common techniques for air interface synchronization between wireless stations include; GNSS (Global Navigation Satellite System), GNSS + PTP (Precision Time Protocol). The GNSS technology is a technology for providing time service by using a GNSS chip on a bearing network, a wireless base station side or a bearing network intermediate device side. The closer the GNSS is to the base station side, the higher the time service precision is; however, since all time services need to depend on GNSS chips, the network deployment cost is high, and when GNSS signals are weak or no GNSS signals exist, the air interface synchronization requirement of wireless communication cannot be met. The GNSS + PTP technology is a technology for bearing PTP timing information by utilizing a GNSS chip and a wired network, and compared with the GNSS technology, the network deployment cost is lower. However, in the GNSS + PTP technology, the time service precision of PTP is poor, and a wired network is required to carry, so that the network deployment of the technology lacks flexibility.
A conventional inter-station air interface time service mode needs to depend on a GNSS chip and a wired network to bear PTP time service information, but the traditional GNSS or GNSS + PTP time service mode has the following problems:
1) when no GNSS signal exists, the GNSS signal is weak or a wired network cannot be rapidly deployed, the traditional time service technology based on GNSS or GNSS + PTP cannot meet the requirement of synchronization among wireless communication stations.
2) High-precision positioning needs strict inter-station synchronization precision, and the traditional time service technology based on GNSS or GNSS + PTP can not reach nanosecond-level time service precision.
3) At present, an air interface-based timing scheme needs to be subjected to complex information interaction, and equipment is in an RRC (radio resource control) connection state, so that the equipment cost and the power consumption are higher, and the timing precision is low.
Disclosure of Invention
An object of the present disclosure is to provide a time synchronization method, a wireless communication device, and a storage medium for wireless communication, which can improve the accuracy of time synchronization between nodes of wireless communication, while contributing to reduction in power consumption and cost of the wireless communication device, in view of the problems in the related art.
In a first aspect, a method for time synchronization between nodes for wireless communication is provided. The method comprises the following steps: the first communication node calculates and sends clock correction information before the establishment of the radio resource control connection; the second communication node synchronizes a local clock based on the clock correction information.
In a second aspect, a method of time synchronization is provided for an upstream wireless communication device. The method comprises the following steps: calculating clock correction information prior to establishing a radio resource control connection with a downstream device; sending the clock correction information to the downstream device to trigger the downstream device to synchronize a local clock based on the clock correction information.
In a third aspect, a further time synchronization method is provided for a downstream wireless communication device. The method comprises the following steps: receiving clock correction information from an upstream device prior to establishing a radio resource control connection with the upstream device; synchronizing a local clock based on the clock correction information.
In a fourth aspect, a wireless communication device is provided, comprising: a clock correction unit and a signal processing unit. The clock correction unit is used for calculating clock correction information before establishing a wireless resource control connection with a downstream device; the signal processing unit is used for sending the clock correction information to the downstream equipment to trigger the downstream equipment to synchronize a local clock based on the clock correction information.
In a fifth aspect, there is provided a wireless communication device comprising: a clock synchronization unit and a signal processing unit. The signal processing unit is used for receiving clock correction information from an upstream device before a wireless resource control connection is established with the upstream device; the clock synchronization unit is configured to synchronize a local clock based on the clock correction information.
In a sixth aspect, a computer-readable storage medium is provided having computer instructions stored therein. The computer instructions, when executed by a computer, cause the computer to perform the steps of any of the above described methods for time synchronization for an upstream wireless communication device.
In a seventh aspect, a further computer-readable storage medium is provided having computer instructions stored therein. The computer instructions, when executed by a computer, cause the computer to perform the steps of any of the above described methods for time synchronization for a downstream wireless communication device.
The time synchronization method for wireless communication, the wireless communication device and the storage medium provided by the present disclosure can realize high-precision synchronization between nodes of wireless communication. Compared with the prior art, the time synchronization method provided by the disclosure has a more concise synchronization process between wireless communication nodes. And, the time synchronization process is completed before the radio resource control connection is established, which is helpful to reduce the power consumption and cost of the wireless communication device because of the signaling overhead saved. Further, the synchronization accuracy between the communication nodes can be further improved by obtaining the clock correction information according to the average value of the plurality of clock correction parameters.
Drawings
The technical solutions and other advantages of the present disclosure will become apparent from the following detailed description of specific embodiments of the present disclosure, which is to be read in connection with the accompanying drawings.
Fig. 1 is a schematic diagram illustrating steps of a method for time synchronization between nodes in wireless communication according to the present disclosure.
Fig. 2 is a schematic diagram illustrating the sub-step of S1 in fig. 1.
Fig. 3 is a schematic diagram illustrating the sub-step of S13 in fig. 2.
Fig. 4 is a schematic step diagram of a time synchronization method for an upstream wireless communication device according to the present disclosure.
Fig. 5 is a schematic diagram illustrating the sub-steps of S400 in fig. 4.
Fig. 6 is a schematic step diagram of a time synchronization method for a downstream wireless communication device according to the present disclosure.
Fig. 7 is a schematic diagram illustrating the sub-steps of S600 in fig. 6.
Fig. 8 is a schematic structural diagram of a wireless communication device provided in the present disclosure.
Fig. 9 is a schematic structural diagram of another wireless communication device provided by the present disclosure.
Detailed Description
The technical solution in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings. The terms "first," "second," "third," and the like in the description and in the claims of the present disclosure and in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the objects so described are interchangeable under appropriate circumstances. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover a non-exclusive inclusion. In the description of the present disclosure, "a plurality" means two or more unless specifically limited otherwise. Throughout the description of the present disclosure, it is to be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present disclosure can be understood by those of ordinary skill in the art as appropriate.
The present disclosure provides a method for time synchronization between nodes in wireless communication, as shown in fig. 1, the method including:
s1: the first communication node calculates and transmits clock correction information prior to establishment of the radio resource control connection.
S2: the second communication node synchronizes the local clock based on the clock correction information.
Compared with the traditional time service technology based on GNSS or the combination of GNSS and PTP, the time synchronization method provided by the disclosure can enable the second communication node to complete the time synchronization process with the first communication node before the Radio Resource Control Connection (Radio Resource Control Connection) is established. Since RRC Connection (RRC Connection) does not need to be established, transmission of many signaling, such as signaling of RRC Connection establishment Request (RRC Connection Request), RRC Connection establishment (RRC Connection Setup), RRC Connection Setup completion (RRC Connection Setup Complete), and the like, is reduced, and thus, cost and power consumption of devices corresponding to each communication node are reduced. Specifically, referring to fig. 2, S1 includes the following steps:
s11: the first communication node sends a synchronization signal to the second communication node.
It should be noted that the first communication node described in the present disclosure may include, but is not limited to: base stations, wireless relay devices, etc.; the second communication node described in the present disclosure may include, but is not limited to: a base station, a wireless relay device, a user terminal, other devices that make up a wireless station, etc.
Illustratively, based on the 5G communication protocol, the uplink synchronization process between the ue and the base station is taken as an example. The base station corresponds to a first communication node, and the user terminal corresponds to a second communication node.
Specifically, at the initial stage of the random access process, the user terminal randomly selects a Preamble sequence (Preamble) to initiate the random access process, and in response, the base station broadcasts system information to the user terminal. The system information includes synchronization signals such as SSBs and SIB 1.
S12: in response to the synchronization signal, the second communication node transmits a random access signal to the first communication node.
Illustratively, the user terminal sends a random access signal to the base station after detecting a synchronization signal issued by the base station. The Random Access signal may be carried on a Physical Random Access Channel (PRACH) configured by the base station for the user equipment.
The random access signal may carry a preamble sequence, which includes information such as an identity and a geographical location of the ue.
S13: based on the random access signal, the first communication node calculates clock correction information and subsequently sends the clock correction information to the second communication node.
Specifically, the first communication node calculates the clock correction information based on the random access signal and transmits the clock correction information to the second communication node.
Illustratively, the base station obtains relevant information from a random access signal carrying a preamble sequence sent by the user terminal, and calculates clock correction information suitable for synchronization between the user terminal and the base station based on the relevant information.
In some embodiments of the present disclosure, the step of the first communication node acquiring the clock correction information is as shown in fig. 3:
s131: the first communication node calculates a clock correction parameter associated with the second communication node based on the random access signal.
Specifically, the clock correction parameter (Δ T) is obtained according to timing Advance (Time Advance, abbreviated in english: TA) of data sent by the second communication node to the first communication node, a calculation error of TA, a data propagation delay, a processing delay of hardware equipment of the communication node, a quantization error, and other data.
Exemplarily, Δ T = (T)1-t2)/2-t3。
Wherein, t1Indicating the moment when the first communication node actually receives the random access signal; t is t2Indicating a time at which the first communication node receives the random access signal expected according to frame timing; t is t3The delay error of data transmission between the first communication node and the second communication node, which is obtained by the first communication node according to the random access signal, includes but is not limited to: the calculation error of TA, data propagation delay, processing delay of communication node hardware equipment, quantization error and the like.
S132: the first communication node obtains a first clock value.
Illustratively, the first clock value is a local clock on the first communication node side.
S133: and the first communication node calibrates the first clock value according to the clock correction parameter to obtain a second clock value.
In particular, T1’=T1+ΔT。
Wherein, T1' represents a second clock value; t is1Representing a first clock value; Δ T denotes a clock correction parameter.
S134: and the first communication node sends the clock correction information carrying the second clock value to the second communication node.
In some embodiments of the present disclosure, the clock correction Information may be transmitted in the form of radio resource Control layer signaling, system message, data link layer Control Information (MAC Control Element), Downlink Control Information (DCI), or the like. Exemplarily, the second clock value (T)1') can be carried by the NR R16 system message SIB 9.
Further, the second communication node receives the clock correction information and updates the local clock value to a second clock value in the clock correction information.
Specifically, let T2=T1', wherein, T1' indicates a second clock value, T, carried in the clock correction information2Representing the local clock value of the second communication node.
Further, the second clock value (T) may be calculated from an average value of a plurality of Δ Ts in order to eliminate an error caused by a fluctuation in consideration of a certain fluctuation of the clock correction parameter (Δ T)1') to ensure accuracy of synchronization between the communicating nodes.
Specifically, S11 and S12 are repeatedly performed, i.e., the first communication node repeatedly transmits the synchronization signal to the second communication node; in response to each synchronization signal, the second communication node transmits a corresponding plurality of random access signals to the first communication node.
The first communication node further obtains a plurality of clock correction parameters (Δ T) associated with the second communication node based on the plurality of random access signals, respectively, whereupon the first clock value (T) is calculated based on an average of the plurality of clock correction parameters (Δ T)1) Correcting to obtain a second clock value (T)1’）。
Specifically, the method comprises the following steps:
；
then let T2=T1' completing the calibration of the local clock value of the second communication node.
Wherein N represents the number of times that the first communication node transmits the synchronization signal to the second communication node; i = [1, 2, … …, N-1, N ].
Further, it is also possible to count the standard deviation (a%) of N clock correction parameters (Δ T), and data exceeding a% does not participate in accumulation. The value of a is self-defined by a node equipment manufacturer, the minimum value of a is 0, and the maximum value of a is 100.
In some embodiments of the present disclosure, S11 to S13 may be further repeatedly performed to cause the first communication node to repeatedly send a second clock value (T) to the second communication node1') clock correction information.
The second communication node further being responsive to a plurality of second clock values (T)1') to calibrate the local clock value (T)2）。
Specifically, the method comprises the following steps:
。
wherein N represents the number of times that the first communication node transmits the synchronization signal to the second communication node; i = [1, 2, … …, N-1, N ].
Further, N second clock values (T) may be counted1') standard deviation (a%), data above a% did not participate in the accumulation. The value of a is self-defined by a node equipment manufacturer, the minimum value of a is 0, and the maximum value of a is 100.
In the existing air interface-based time service scheme, information interaction between communication nodes is complex. Compared with the prior art, the time synchronization method provided by the disclosure has the advantage that the synchronization process between the communication nodes is simpler. And, the time synchronization process is completed before the RRC connected state, which helps to reduce power consumption and cost of the communication device because signaling overhead is saved. In addition, in the method provided by the present disclosure, the clock correction information is obtained according to the average value of the plurality of clock correction parameters, so that the synchronization accuracy between the communication nodes can be further improved.
Referring to fig. 4, the present disclosure further provides a time synchronization method for an upstream wireless communication device, including:
s400: clock correction information is calculated prior to establishing a radio resource control connection with a downstream device.
S500: sending the clock correction information to the downstream device to trigger the downstream device to synchronize the local clock based on the clock correction information.
Referring to fig. 5, S400 specifically includes the following steps:
s410: the synchronization signal is transmitted to the downstream device before the clock correction information is transmitted.
S420: and receiving a random access signal transmitted by the downstream device in response to the synchronization signal.
S430: a first clock value is obtained and a clock correction parameter associated with the downstream device is calculated based on the random access signal, and the first clock value is then calibrated according to the clock correction parameter to obtain a second clock value.
Wherein the first clock value is a local clock value of the upstream wireless communication device.
Optionally, in order to eliminate the fluctuation error of the clock correction parameter, S410 and S420 may be repeatedly performed, that is, the synchronization signal is repeatedly transmitted to the downstream device to receive a plurality of random access signals transmitted by the downstream device in response to the synchronization signal.
And calculating a plurality of clock correction parameters associated with the downstream devices based on the plurality of random access signals, respectively, and then correcting the first clock value based on an average value of the plurality of clock correction parameters to obtain the second clock value.
Further, S500 is executed, and the clock correction information carrying the second clock value is sent to the downstream device, so as to trigger the downstream device to synchronize a local clock based on the second clock value in the clock correction information.
Other aspects of the time synchronization method for the upstream wireless communication device provided by the present disclosure are the same as or similar to the time synchronization method between the nodes for wireless communication described above (e.g., the clock correction parameter, the calculation manner of the second clock value, etc.), and are not described herein again.
Referring to fig. 6, the present disclosure further provides a time synchronization method for a downstream wireless communication device, including:
s600: clock correction information is received from an upstream device prior to establishing a radio resource control connection with the upstream device.
S700: the local clock is synchronized based on the clock correction information.
Referring to fig. 7, S600 specifically includes the following steps:
s610: the synchronization signal from the upstream device is received prior to receiving the clock correction information.
S620: in response to the synchronization signal, a random access signal is transmitted to an upstream device.
Alternatively, in order to eliminate the fluctuation error of the clock correction parameter, S610 and S620 may be repeatedly performed, that is, a synchronization signal repeatedly transmitted by the upstream device is received, and then a plurality of random access signals are transmitted to the upstream device in response to the respective synchronization signals.
Further, S700 is performed to update the local clock value to the clock value contained in the clock correction information.
Other aspects of the wireless communication device provided by the present disclosure are the same as or similar to the aforementioned time synchronization method between nodes for wireless communication (e.g., a calibration manner for local clock values, etc.), and are not described herein again.
The present disclosure also provides a wireless communication device including, but not limited to: base stations, wireless relay devices, etc.
Referring to fig. 8, a wireless communication device 800 includes: a clock correction unit 810 and a signal processing unit 820. Wherein the clock correction unit 810 is configured to calculate clock correction information prior to establishing a radio resource control connection with a downstream device. The signal processing unit 820 is configured to send the clock correction information to the downstream device to trigger the downstream device to synchronize a local clock based on the clock correction information.
In a further embodiment, the signal processing unit 820 is further configured to send a synchronization signal to the downstream device before sending the clock correction information.
In a further embodiment, the signal processing unit 820 is further configured to receive a random access signal transmitted by the downstream device in response to the synchronization signal.
In a further embodiment, the clock correction unit 810 calculates the clock correction information as follows:
a first clock value is obtained and a clock correction parameter associated with the downstream device is calculated based on the random access signal, wherein the first clock value is a local clock value of the wireless communication device.
And calibrating the first clock value according to the clock correction parameter to obtain a second clock value.
In a further embodiment, the signal processing unit 820 sends the clock correction information carrying the second clock value to the downstream device to trigger the downstream device to calibrate the local clock based on the second clock value.
Optionally, the signal processing unit 820 is further configured to repeatedly transmit the synchronization signal to the downstream device to receive a plurality of random access signals transmitted by the downstream device in response to the synchronization signal.
The clock correction unit 810 further calculates a plurality of clock correction parameters associated with the downstream devices based on the plurality of random access signals, respectively, and then corrects the first clock value based on an average value of the plurality of clock correction parameters to obtain the second clock value.
Other aspects of the wireless communication device provided by the present disclosure are the same as or similar to the aforementioned time synchronization method between nodes for wireless communication (e.g., calculation of the clock correction parameter and the second clock value, etc.), and are not repeated herein.
The present disclosure also provides for yet another wireless communication device including, but not limited to: a base station, a wireless relay device, a user terminal, other devices that make up a wireless station, etc.
Referring to fig. 9, a wireless communication device 900 includes: a clock synchronization unit 910 and a signal processing unit 920. Wherein the signal processing unit 920 is configured to receive clock correction information from an upstream device before establishing a radio resource control connection with the upstream device. The clock synchronization unit 910 is configured to synchronize a local clock based on the clock correction information.
In a further embodiment, the signal processing unit 920 is further configured to receive a synchronization signal from the upstream device before receiving the clock correction information.
In a further embodiment, the signal processing unit 920 is further configured to send a random access signal to the upstream device in response to the synchronization signal.
In a further embodiment, the clock synchronization unit 910 updates the local clock value to the clock value contained in the clock correction information.
Optionally, the signal processing unit 920 is further configured to receive synchronization signals repeatedly sent by the upstream device, and then send a plurality of random access signals to the upstream device in response to the respective synchronization signals.
Other aspects of the wireless communication device provided by the present disclosure are the same as or similar to the aforementioned time synchronization method between nodes for wireless communication (e.g., a calibration manner for local clock values, etc.), and are not described herein again.
The present disclosure also provides a computer-readable storage medium having computer instructions stored therein. The computer instructions, when executed by a computer, cause the computer to perform the steps of any of the above described methods for time synchronization for an upstream wireless communication device.
The present disclosure also provides yet another computer-readable storage medium having computer instructions stored therein. The computer instructions, when executed by a computer, cause the computer to perform the steps of any of the above described methods for time synchronization for a downstream wireless communication device.
It will be understood by those of ordinary skill in the art that all or part of the flow in the above embodiments of the time synchronization method may be implemented in hardware and/or software in association with computer program instructions. The computer program may be stored in a non-volatile computer readable storage medium, and when executed, may perform the processes of the above method embodiments. Any reference to memory, storage, database, or other medium used in embodiments provided by the present disclosure may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Enhanced SDRAM (ESDRAM), Rambus (Rambus) direct RAM (RDRAM), Direct Rambus Dynamic RAM (DRDRAM), and Rambus Dynamic RAM (RDRAM).
In summary, the present disclosure provides a time synchronization method, a wireless communication device, and a storage medium for wireless communication. Compared with the prior art, the time synchronization method provided by the disclosure has the advantage that the synchronization process between the communication nodes is simpler. And, the time synchronization process is completed before the RRC connected state, which helps to reduce power consumption and cost of the communication device because signaling overhead is saved. In addition, in the method provided by the present disclosure, the clock correction information is obtained according to the average value of the plurality of clock correction parameters, so that the synchronization accuracy between the communication nodes can be further improved.
In the above embodiments, the principle and the implementation manner of the present disclosure are explained by applying specific embodiments, and descriptions of various embodiments have respective emphasis, and for parts which are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments. The above description of the embodiments is only for helping understanding the technical solutions of the present disclosure and the core ideas thereof; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present disclosure.
Claims (31)
1. A method for time synchronization between nodes in wireless communication, the method comprising:
the first communication node calculates and sends clock correction information before the establishment of the radio resource control connection;
the second communication node synchronizes a local clock based on the clock correction information.
2. The method of claim 1, wherein the step of the first communication node calculating and sending clock correction information prior to establishment of the rrc connection comprises:
the first communication node sends a synchronization signal to the second communication node;
in response to the synchronization signal, the second communication node transmits a random access signal to the first communication node.
3. The method of claim 2, wherein the step of the first communication node calculating and transmitting clock correction information prior to establishment of the radio resource control connection further comprises:
based on the random access signal, the first communication node calculates the clock correction information and then sends the clock correction information to the second communication node.
4. The method of claim 3, wherein the step of the first communication node calculating the clock correction information based on the random access signal comprises:
the first communication node obtaining a first clock value and calculating a clock correction parameter associated with the second communication node based on the random access signal, wherein the first clock value is a local clock value of the first communication node;
and the first communication node calibrates the first clock value according to the clock correction parameter to obtain a second clock value.
5. The method of claim 4, wherein the clock correction information comprises the second clock value.
6. The method of claim 5, wherein the step of the second communication node synchronizing the local clock based on the clock correction information comprises:
the second communication node updates a local clock value to the second clock value in the clock correction information.
7. The method of claim 6, wherein the step of the first communication node calculating and sending clock correction information prior to establishment of the radio resource control connection further comprises:
the first communication node repeatedly transmits the synchronization signal to the second communication node;
in response to each of the synchronization signals, the second communication node transmitting a corresponding plurality of the random access signals to the first communication node;
the first communication node calculates a plurality of clock correction parameters associated with the second communication node based on a plurality of the random access signals, respectively, whereupon the first clock value is corrected based on an average of the plurality of clock correction parameters to obtain the second clock value.
8. A method for time synchronization for a wireless communication device, the method comprising:
calculating clock correction information prior to establishing a radio resource control connection with a downstream device;
sending the clock correction information to the downstream device to trigger the downstream device to synchronize a local clock based on the clock correction information.
9. The method of claim 8, wherein the step of calculating clock correction information prior to establishing a radio resource control connection with a downstream device comprises:
transmitting a synchronization signal to the downstream device prior to transmitting the clock correction information.
10. The method of claim 9, wherein the step of calculating clock correction information prior to establishing a radio resource control connection with a downstream device further comprises:
and receiving a random access signal transmitted by the downstream equipment in response to the synchronous signal.
11. The method of claim 10, wherein the step of calculating clock correction information prior to establishing a radio resource control connection with a downstream device further comprises:
obtaining a first clock value and calculating a clock correction parameter associated with the downstream device based on the random access signal, wherein the first clock value is a local clock value of the wireless communication device;
and calibrating the first clock value according to the clock correction parameter to obtain a second clock value.
12. The method of claim 11, wherein the clock correction information comprises the second clock value.
13. The method of claim 12, wherein the step of calculating clock correction information prior to establishing a radio resource control connection with a downstream device further comprises:
repeatedly transmitting the synchronization signal to the downstream device to receive a plurality of the random access signals transmitted by the downstream device in response to the synchronization signal;
a plurality of clock correction parameters associated with the downstream device are respectively calculated based on a plurality of the random access signals, whereupon the first clock value is corrected based on an average of the plurality of clock correction parameters to obtain the second clock value.
14. A method for time synchronization for a wireless communication device, the method comprising:
receiving clock correction information from an upstream device prior to establishing a radio resource control connection with the upstream device;
synchronizing a local clock based on the clock correction information.
15. The method of claim 14, wherein the step of receiving clock correction information from an upstream device prior to establishing a radio resource control connection with the upstream device comprises:
receiving a synchronization signal from the upstream device prior to receiving the clock correction information.
16. The method of claim 15, wherein the step of receiving clock correction information from an upstream device prior to establishing a radio resource control connection with the upstream device comprises:
transmitting a random access signal to the upstream device in response to the synchronization signal.
17. The method of claim 16, wherein the step of synchronizing the local clock based on the clock correction information comprises:
updating a local clock value to a clock value contained in the clock correction information.
18. The method of claim 17, wherein the step of receiving clock correction information from an upstream device prior to establishing a radio resource control connection with the upstream device comprises:
receiving the synchronization signals repeatedly transmitted by the upstream device, and then transmitting a plurality of the random access signals to the upstream device in response to the respective synchronization signals.
19. A wireless communication device, the wireless communication device comprising:
a clock correction unit for calculating clock correction information prior to establishing a radio resource control connection with a downstream device;
a signal processing unit to send the clock correction information to the downstream device to trigger the downstream device to synchronize a local clock based on the clock correction information.
20. The device of claim 19, wherein the signal processing unit is further configured to send a synchronization signal to the downstream device prior to sending the clock correction information.
21. The device of claim 20, wherein the signal processing unit is further configured to receive a random access signal sent by the downstream device in response to the synchronization signal.
22. The apparatus of claim 21, wherein the clock correction unit calculates the clock correction information as follows:
obtaining a first clock value and calculating a clock correction parameter associated with the downstream device based on the random access signal, wherein the first clock value is a local clock value of the wireless communication device;
and calibrating the first clock value according to the clock correction parameter to obtain a second clock value.
23. The apparatus of claim 22, wherein the clock correction information comprises the second clock value.
24. The device of claim 23, wherein the signal processing unit is further configured to repeatedly send the synchronization signal to the downstream device to receive a plurality of the random access signals sent by the downstream device in response to the synchronization signal;
the clock correction unit is further configured to calculate a plurality of clock correction parameters associated with the downstream device based on the plurality of random access signals, respectively, and then correct the first clock value based on an average value of the plurality of clock correction parameters to obtain the second clock value.
25. A wireless communication device, the wireless communication device comprising:
a signal processing unit for receiving clock correction information from an upstream device prior to establishing a radio resource control connection with the upstream device;
a clock synchronization unit to synchronize a local clock based on the clock correction information.
26. The device of claim 25, wherein the signal processing unit is further configured to receive a synchronization signal from the upstream device prior to receiving the clock correction information.
27. The apparatus of claim 26, wherein the signal processing unit is further configured to: transmitting a random access signal to the upstream device in response to the synchronization signal.
28. The apparatus of claim 27, wherein the clock synchronization unit synchronizes a local clock based on the clock correction information as follows:
updating a local clock value to a clock value contained in the clock correction information.
29. The device of claim 28, wherein the signal processing unit is further configured to receive the synchronization signals repeatedly transmitted by the upstream device, and then transmit a plurality of the random access signals to the upstream device in response to each of the synchronization signals.
30. A computer readable storage medium storing computer instructions which, when executed by a computer, cause the computer to perform the steps of the method for time synchronization of a wireless communication device of any one of claims 8 to 13.
31. A computer readable storage medium storing computer instructions which, when executed by a computer, cause the computer to perform the steps of the method for time synchronization of a wireless communication device of any one of claims 14 to 18.
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