CN110662283A - Clock synchronization method and device - Google Patents
Clock synchronization method and device Download PDFInfo
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- CN110662283A CN110662283A CN201810688385.3A CN201810688385A CN110662283A CN 110662283 A CN110662283 A CN 110662283A CN 201810688385 A CN201810688385 A CN 201810688385A CN 110662283 A CN110662283 A CN 110662283A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W56/00—Synchronisation arrangements
- H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
- H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
- H04W56/0065—Synchronisation arrangements determining timing error of reception due to propagation delay using measurement of signal travel time
- H04W56/007—Open loop measurement
- H04W56/0075—Open loop measurement based on arrival time vs. expected arrival time
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Abstract
The application provides a method and a device for clock synchronization, wherein the method comprises the following steps: the network equipment receives an uplink signal of a terminal, determines the time deviation between the time when the uplink signal actually reaches the network equipment and the target arrival time of the uplink signal, indicates the time deviation to the terminal through indication information, and the terminal corrects the clock of the terminal through the time deviation so as to ensure the clock synchronization with the network equipment. According to the clock synchronization method, the terminal carries out clock synchronization through the time deviation indicated by the network equipment, and the requirement of high-precision clock synchronization between the network equipment and the terminal is met.
Description
Technical Field
The present application relates to the field of communications, and more particularly, to a method and apparatus for clock synchronization.
Background
In order to ensure orthogonality of uplink transmissions and avoid intra-cell interference, a network device requires that signals from different terminals in the same subframe but in different frequency domain resources arrive at the network device substantially aligned in time. The network device can correctly decode the uplink data as long as the network device receives the uplink data sent by the terminal within a Cyclic Prefix (CP) range, so that uplink synchronization requires that the time of arrival of signals from different terminals in the same subframe to the network device falls within the CP range. In order to ensure synchronization of a receiving side (network device side), Long Term Evolution (LTE) proposes a Timing Advance (TA) mechanism.
From the terminal side, the timing advance TA is essentially a time offset between the starting time of receiving the downlink subframe and the starting time of transmitting the uplink subframe by the terminal. The network device can control the time when the uplink signals from different terminals reach the network device by appropriately controlling the TA of each terminal. For the terminal far away from the network device, due to the larger transmission delay, the terminal closer to the network device is required to transmit the uplink data in advance.
The network device indicates an initial TA to the terminal when the terminal performs random access, and then sends TA adjustment quantity to the terminal irregularly through a timing advance command (TA command).
Disclosure of Invention
In view of this, the present application provides a clock synchronization method and apparatus, so as to meet the requirement of high-precision clock synchronization between a network device and a terminal.
In a first aspect, a method for clock synchronization is provided, the method including: a terminal sends a first uplink signal to network equipment; the terminal receives first indication information from the network equipment, wherein the first indication information is used for indicating a time deviation between a time when the first uplink signal actually reaches the network equipment and a time when the first uplink signal is expected to reach the network equipment; and the terminal carries out clock synchronization according to the time deviation.
It should be understood that the time when the first uplink signal is expected to reach the network device may also be understood as a target arrival time of the first uplink signal, or the time when the first uplink signal is expected to reach the network device may also be understood as a time when a boundary of a first time unit, which is estimated by the network device or the terminal, is expected to reach the network device, where the first time unit is a time unit for actually transmitting the first uplink signal.
In some possible implementations, the time offset is an offset between a sampling point of a time at which the first uplink signal actually arrives at the network device and a sampling point of a time at which the first uplink signal is expected to arrive at the network device.
In this embodiment, the time unit may be a radio frame, a subframe, a slot, a micro slot (mini slot), an Orthogonal Frequency Division Multiplexing (OFDM) symbol defined in the LTE or 5G NR system, or may be a time window formed by multiple frames or subframes, for example, a System Information (SI) window.
The clock synchronization method of the embodiment of the application sends the time deviation to the terminal through the network equipment, and is beneficial to meeting the requirement of high-precision clock synchronization between the network equipment and the terminal.
With reference to the first aspect, in some possible implementation manners of the first aspect, the receiving, by the terminal, first indication information from the network device includes: the terminal receives the first indication information from the network equipment in a second time unit; the second time unit is an nth time unit after the first time unit, or the second time unit is an nth available time unit after the first time unit, or the second time unit is a first available time unit after the nth time unit, the first time unit is a time unit for actually transmitting the first uplink signal, and N is a positive integer greater than or equal to 1.
In some possible implementations, N is configured by the network device, or N is predefined by a protocol.
In some possible implementations, the terminal receives the first indication information in a first time window after transmitting the first uplink signal.
In some possible implementations, the length of time, the period of occurrence, and the time offset relative to the first uplink signal of the first time window are configured by the network device or predefined by a protocol.
In some possible implementations, the terminal receives the first indication information sent by the network device with the first period.
In some possible implementations, the network device receives the first uplink signal sent by the terminal with the first period.
With reference to the first aspect, in some possible implementations of the first aspect, the method further includes: and the terminal adjusts the transmission advance of the second uplink signal according to the time deviation.
With reference to the first aspect, in some possible implementation manners of the first aspect, the first indication information further includes information used for indicating a time-frequency resource of the first uplink signal; or, the first indication information further includes information for indicating frequency domain resources of the first uplink signal; or, the first indication information further includes information for indicating a time domain resource of the first uplink signal.
In the method for clock synchronization in the embodiment of the present application, the first indication information carries information of the time domain resource and/or the frequency domain resource of the first uplink signal, which is helpful for the terminal to determine that the time offset in the first indication information is obtained by the terminal sending the first uplink signal.
With reference to the first aspect, in some possible implementations of the first aspect, the method further includes: the terminal receives second indication information from the network device, the second indication information including information indicating a granularity of the time offset.
In some possible implementations, the first indication information and the second indication information are carried in the same signaling.
In some possible implementations, the granularity of the time offset is a positive integer of nanoseconds (ns) or 2μTCOr TS。
In some possible implementations, the granularity of the time offset is 100ns, 50ns, 10ns, or 2 nsμTCOr TS。
With reference to the first aspect, in some possible implementation manners of the first aspect, the first indication information is carried in downlink control information DCI, a media access control layer control element MAC CE, or radio resource control RRC signaling.
In a second aspect, a method for clock synchronization is provided, the method comprising: the network equipment receives a first uplink signal from a terminal; the network device sends first indication information to the terminal, wherein the first indication information is used for indicating a time deviation between a time when the first uplink signal actually reaches the network device and a time when the first uplink signal is expected to reach the network device, and the time deviation is used for clock synchronization of the terminal.
It should be understood that the time when the first uplink signal is expected to reach the network device may also be understood as a target arrival time of the first uplink signal, or the time when the first uplink signal is expected to reach the network device may also be understood as a time when a first time unit, which is a time unit actually transmitting the first uplink signal, is expected to reach the network device by the network device or the terminal.
In some possible implementations, the time offset is an offset between a sampling point of a time at which the first uplink signal actually arrives at the network device and a sampling point of a time at which the first uplink signal is expected to arrive at the network device.
In this embodiment, the time unit may be a radio frame, a subframe, a slot, a micro slot (mini slot), an OFDM symbol defined in the LTE or 5G NR system, or may be a time window formed by multiple radio frames or subframes, for example, an SI window.
The clock synchronization method of the embodiment of the application sends the time deviation to the terminal through the network equipment, and is beneficial to meeting the requirement of high-precision clock synchronization between the network equipment and the terminal.
With reference to the second aspect, in some possible implementation manners of the second aspect, the sending, by the network device, the first indication information to the terminal includes: in a second time unit, the network equipment sends the first indication information to the terminal; wherein the second time unit is the Nth time unit after the first time unit; or, the second time unit is the nth available time unit after the first time unit; or, the second time unit is a first available time unit after the nth time unit, the first time unit is a time unit for actually transmitting the first uplink signal, and N is a positive integer greater than or equal to 1.
In some possible implementations, the network device sends the first indication information in a first time window after receiving the first uplink signal.
In some possible implementations, the length of time, the period of occurrence, and the time offset relative to the first uplink signal of the first time window are configured by the network device or predefined by a protocol.
With reference to the second aspect, in some possible implementation manners of the second aspect, the sending, by the network device, the first indication information to the terminal includes: and when the time deviation is greater than or equal to a first time threshold value, the network equipment sends the first indication information to the terminal.
With reference to the second aspect, in some possible implementation manners of the second aspect, the first indication information further includes information used for indicating a time-frequency resource of the first uplink signal; or, the first indication information further includes information for indicating frequency domain resources of the first uplink signal; or, the first indication information further includes information for indicating a time domain resource of the first uplink signal.
In the method for clock synchronization in the embodiment of the present application, the first indication information carries information of the time domain resource and/or the frequency domain resource of the first uplink signal, which is helpful for the terminal to determine that the time offset in the first indication information is obtained by the terminal sending the first uplink signal.
With reference to the second aspect, in some possible implementations of the second aspect, the method further includes: the network device sends second indication information to the terminal, the second indication information including information indicating a granularity of the time offset.
In some possible implementations, the first indication information and the second indication information are carried in the same signaling.
In some possible implementations, the granularity of the time offset is a positive integer of nanoseconds (ns) or 2μTCOr TS。
In some possible implementations, the granularity of the time offset is 100ns, 50ns, 10ns, or 2 nsμTCOr TS。
With reference to the second aspect, in some possible implementation manners of the second aspect, the first indication information is carried in downlink control information DCI, a media access control layer control element MAC CE, or radio resource control RRC signaling.
In a third aspect, an apparatus for clock synchronization is provided, which includes means for performing each step in the above first aspect or any possible implementation manner of the first aspect.
In a fourth aspect, there is provided an apparatus for clock synchronization, the apparatus comprising means for performing the steps of the second aspect above or any possible implementation manner of the second aspect.
In a fifth aspect, there is provided an apparatus for clock synchronization, the apparatus comprising at least one processor and a memory, the at least one processor being configured to perform the method of the first aspect above or any possible implementation manner of the first aspect.
In a sixth aspect, there is provided an apparatus for clock synchronization, the apparatus comprising at least one processor and a memory, the at least one processor being configured to perform the method of the second aspect above or any possible implementation manner of the second aspect.
In a seventh aspect, an apparatus for clock synchronization is provided, the apparatus comprising at least one processor and an interface circuit, the at least one processor being configured to perform the method of the first aspect or any possible implementation manner of the first aspect.
In an eighth aspect, there is provided an apparatus for clock synchronization, the apparatus comprising at least one processor and an interface circuit, the at least one processor being configured to perform the method of the second aspect above or any possible implementation manner of the second aspect.
A ninth aspect provides a terminal comprising the apparatus provided in the third aspect, or the terminal comprising the apparatus provided in the fifth aspect, or the terminal comprising the apparatus provided in the seventh aspect.
A tenth aspect provides a network device, where the network device includes the apparatus provided in the fourth aspect, or the network device includes the apparatus provided in the sixth aspect, or the network device includes the apparatus provided in the eighth aspect.
In an eleventh aspect, a computer program product is provided, which comprises a computer program for performing the method of the first aspect or any possible implementation of the first aspect, or for performing the method of the second aspect or any possible implementation of the second aspect, when the computer program is executed by a processor.
In a twelfth aspect, a computer-readable storage medium is provided, having stored thereon a computer program for performing the method of the first aspect or any possible implementation form of the first aspect, or for performing the method of the second aspect or any possible implementation form of the second aspect, when the computer program is executed.
Drawings
Fig. 1 is a schematic diagram of a communication system provided in an embodiment of the present application.
Fig. 2 is a schematic diagram of a network architecture provided in an embodiment of the present application.
Fig. 3 is another schematic diagram of a network architecture provided in an embodiment of the present application.
Fig. 4 is a schematic diagram of high-precision clock synchronization provided by an embodiment of the present application.
Fig. 5 is a schematic flow chart of a method for clock synchronization provided by an embodiment of the present application.
Fig. 6 is a schematic block diagram of an apparatus for clock synchronization provided by an embodiment of the present application.
Fig. 7 is another schematic block diagram of an apparatus for clock synchronization provided by an embodiment of the present application.
Fig. 8 is a schematic structural diagram of a terminal provided in an embodiment of the present application.
Fig. 9 is a schematic structural diagram of a network device according to an embodiment of the present application.
Detailed Description
Some terms in this application are described below:
1) a terminal, also called User Equipment (UE), a Mobile Station (MS), a Mobile Terminal (MT), etc., is a device that provides voice/data connectivity to a user, for example, a handheld device with a wireless connection function, a vehicle-mounted device, etc. Currently, some examples of terminals are: a mobile phone (mobile phone), a tablet computer, a notebook computer, a palm computer, a Mobile Internet Device (MID), a wearable device, a Virtual Reality (VR) device, an Augmented Reality (AR) device, a wireless terminal in industrial control (industrial control), a wireless terminal in self driving (self driving), a wireless terminal in remote surgery (remote medical supply), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (smart security), a wireless terminal in city (smart city), a wireless terminal in home (smart home), and the like.
2) A network device is a device in a wireless network, such as a Radio Access Network (RAN) node that accesses a terminal to the wireless network. Currently, some examples of RAN nodes are: a base station, a next generation base station gNB, a Transmission Reception Point (TRP), an evolved Node B (eNB), a home base station, a baseband unit (BBU), or an Access Point (AP) in a WiFi system. In one network configuration, the network device may be a RAN device including a Centralized Unit (CU) node, or a Distributed Unit (DU) node, or including a CU node and a DU node.
The technical scheme of the embodiment of the application can be applied to various communication systems, for example: a Long Term Evolution (LTE) system, an LTE Frequency Division Duplex (FDD) system, an LTE Time Division Duplex (TDD) system, a Worldwide Interoperability for Microwave Access (WiMAX) communication system, a fifth generation (5th generation, 5G) mobile communication system, or a New Radio (NR) system.
Fig. 1 is a schematic diagram of a communication system 100 provided by an embodiment of the present application, and as shown in fig. 1, a terminal 110 and a terminal 120 access a wireless network to obtain a service of an external network (e.g., the internet) through the wireless network or communicate with other terminals through the wireless network. The wireless network includes RAN130, where RAN130 is used to access terminals 110 and 120 to the wireless network.
It should be understood that the method of transmitting data provided herein may be applied to a wireless communication system, such as the wireless communication system 100 shown in fig. 1. Two communication devices in a wireless communication system have a wireless communication connection therebetween, and one of the two communication devices may correspond to the terminal 110 shown in fig. 1, and may be, for example, the terminal 110 in fig. 1, or may be a chip configured in the terminal 110; the other of the two communication devices may correspond to the RAN130 shown in fig. 1, and may be, for example, the RAN130 in fig. 1, or a chip configured in the RAN 130.
It should also be understood that the communication system 100 shown in fig. 1 may also include a Core Network (CN) that may be used to manage terminals and provide a gateway for communicating with external networks.
In the embodiment of the present application, the high-precision clock synchronization is a process in which the terminal corrects the current clock skew according to the signal transmission time information between the RAN130 and the terminal. The basic principle is that the clock deviation is solved by assuming the reciprocity of uplink and downlink propagation delay and utilizing the time information of signal transmission, and finally the purpose of high-precision synchronization of the clock is achieved.
The network architecture described in the embodiment of the present application is for facilitating readers to clearly understand the technical solutions of the embodiments of the present application, and does not form a limitation on the technical solutions provided in the embodiments of the present application, and it can be known by a person of ordinary skill in the art that the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems along with the evolution of the network architecture and the appearance of new service scenarios.
Fig. 2 is a schematic diagram of a network architecture provided in an embodiment of the present application, and as shown in fig. 2, the network architecture includes a CN device and a RAN device. The RAN device includes a baseband device and a radio frequency device, where the baseband device may be implemented by one node or by multiple nodes, and the radio frequency device may be implemented independently by being pulled away from the baseband device, or integrated with the baseband device in the same physical device, or partially pulled away and partially integrated with the baseband device. For example, in an LTE communication system, an eNB as RAN equipment includes a baseband device and a radio frequency device, where the radio frequency device may be remotely arranged with respect to the baseband device, for example, a Remote Radio Unit (RRU) is remotely arranged with respect to a BBU.
The communication between the RAN equipment and the terminal follows a certain protocol layer structure. For example, the control plane protocol layer structure may include functions of protocol layers such as a Radio Resource Control (RRC) layer, a Packet Data Convergence Protocol (PDCP) layer, a Radio Link Control (RLC) layer, a Medium Access Control (MAC) layer, and a physical layer. The user plane protocol layer structure can comprise functions of protocol layers such as a PDCP layer, an RLC layer, an MAC layer, a physical layer and the like; in one implementation, a Service Data Adaptation Protocol (SDAP) layer may be further included above the PDCP layer.
The RAN equipment can realize the functions of protocol layers such as radio resource control, packet data convergence layer protocol, radio link control, media access control and the like by one node; or the functions of these protocol layers may be implemented by multiple nodes; for example, in an evolved structure, the RAN equipment may include CUs and DUs, and a plurality of DUs may be centrally controlled by one CU. As shown in fig. 2, the CU and the DU may be divided according to protocol layers of the radio network, for example, functions of a PDCP layer and above protocol layers are provided in the CU, and functions of protocol layers below the PDCP layer, for example, functions of an RLC layer and a MAC layer, are provided in the DU.
This division of the protocol layers is only an example, and it is also possible to divide the protocol layers at other protocol layers, for example, at the RLC layer, and the functions of the RLC layer and the protocol layers above are set in the CU, and the functions of the protocol layers below the RLC layer are set in the DU; alternatively, the functions are divided into some protocol layers, for example, a part of the functions of the RLC layer and the functions of the protocol layers above the RLC layer are provided in the CU, and the remaining functions of the RLC layer and the functions of the protocol layers below the RLC layer are provided in the DU. In addition, the processing time may be divided in other manners, for example, by time delay, a function that needs to satisfy the time delay requirement for processing is provided in the DU, and a function that does not need to satisfy the time delay requirement is provided in the CU.
In addition, the radio frequency device may be pulled away, not placed in the DU, or integrated in the DU, or partially pulled away and partially integrated in the DU, which is not limited herein.
Referring to fig. 3, fig. 3 is a schematic diagram illustrating another network architecture provided in the embodiment of the present application, and with respect to the architecture shown in fig. 2, the Control Plane (CP) and the User Plane (UP) of a CU may be separated and implemented by being divided into different entities, namely, a control plane CU entity (CU-CP entity) and a user plane CU entity (CU-UP entity), respectively.
In the above network architecture, the signaling generated by the CU may be sent to the terminal through the DU, or the signaling generated by the terminal may be received by the DU and then sent to the CU. The DU may pass through the protocol layer encapsulation directly to the terminal or CU without parsing the signaling. In the above embodiment, the CU is divided into the network devices on the RAN side, and in addition, the CU may also be divided into the network devices on the CN side, which is not limited herein.
The apparatus in the following embodiments of the present application may be located in a terminal or a network device according to the functions implemented by the apparatus. When the above structure of CU-DU is adopted, the network device may be a CU node, or a DU node, or a network device including a CU node and a DU node.
The CU and DU architecture in this embodiment is not limited to 5G NR gbb, and may also be applied to a scenario in which an LTE base station is divided into CU and DU. Optionally, when the LTE base station is used, the protocol layer does not include the SDAP layer.
The principle of high-precision clock synchronization is explained below by means of a simple illustration.
In a wireless communication system, a network device and a terminal have respective clock systems. The clock system times according to a predefined rule; the time rule may be a time hierarchy defined according to an international standard or a time standard defined according to a local area network. The network device can calibrate its clock system through a wired network or a Global Positioning System (GPS); the terminal can calibrate the clock system of the terminal by taking the clock system of the network equipment as a reference through a time synchronization process.
Suppose time information of a network device is tBSIs expressed by t, the time information of the terminalUEIs expressed and t is assumedUE＝tBS+ToffsetI.e. the time information displayed by the clock systems of the network device and the terminal at the same time exists ToffsetTime offset of (2). The purpose of high-precision clock synchronization is to estimate and eliminate the time offset T between the clock systems of the network device and the terminaloffsetIn the embodiment of the application, the signal is called a time service signal, a downlink time service signal is sent to the terminal by the network device, and an uplink time service signal is sent to the network device by the terminal.
FIG. 4 shows a schematic diagram of high precision clock synchronization, as shown in FIG. 4, assuming that the network device is in
Sending a downlink time service signal to a terminal, the terminal being
When the downlink time service signal is received,and is terminated at
Sending an uplink time service signal to the network equipment, wherein the network equipment is
And receiving the uplink time service signal. Respectively assuming that the propagation delays of the uplink and downlink time service signals are PULAnd PDL。
From the above assumptions, the following two equations (1) and (2) can be listed. Generally, if the transmission time interval of the uplink and downlink timing signals is not too long and the terminal is not in a very high-speed motion scene, it can be assumed that the uplink and downlink propagation delays are the same, i.e. PUL＝PDL. Thus, T can be expressed by the following system of equationsoffsetThe terminal can be solved according to ToffsetThe value is adjusted appropriately to maintain a high degree of clock synchronization.
PUL＝PDL (3)
From the above equations (1), (2) and (3) it follows:
it can be seen that the network device and the terminal perform time service signal interaction, and determine time information (for example, in fig. 4, time information on a clock system of the network device or the terminal) of the time corresponding to the transmission and reception of the uplink and downlink time service signals
And
) The time offset T between the clock systems of the network device and the terminal can be obtainedoffset。
wherein the content of the first and second substances,
time information, T, representing the time at which the reference frame boundary carrying system information (e.g., SIB16) or a dedicated newly designed high precision time notification message corresponds to on the clock system of the network deviceframeRepresenting radio frame length, e.g. TframeAnd m is equal to 10ms, m represents the frame offset of the frame boundary corresponding to the downlink time service signal relative to the reference frame boundary, and m is an integer greater than or equal to 0.
In particular, when m is 0,
is the time information of the time corresponding to the reference frame boundary on the clock system of the network device.
It should be understood that formula (5) is described by taking the time cell boundary of the downlink timing signal as the radio frame boundary, and the time cell boundary may also be a subframe boundary, a slot boundary, a micro-slot boundary or an Orthogonal Frequency Division Multiplexing (OFDM) symbol boundary, and accordingly, T may be represented by TframeThe sub-frame length, slot length, micro-slot length, or OFDM symbol length is substituted.
For example, the time unit boundary of the downlink timing signal may be a slot boundary, as shown in equation (6):
wherein, TslotIn order to be the length of the time slot,
and the time corresponding to the reference point is represented, the offset of the time slot boundary corresponding to the downlink time service signal relative to the time corresponding to the reference point is m wireless frames and k time slots, and k is an integer greater than or equal to 0.
For another example, the time cell boundary of the downlink timing signal may be a symbol boundary, as shown in equation (7):
wherein, TsymbolThe length of the symbol is, the offset of the symbol boundary corresponding to the downlink time service signal relative to the time corresponding to the reference point is m radio frames, k time slots and l symbols, and l is an integer greater than or equal to 0.
To sum up, the terminal needs to acquire
Other time information is known to the terminal.
wherein n represents a frame offset of a frame boundary corresponding to the uplink time service signal received by the network device relative to a reference frame boundary.
It should be understood that, similarly to the above-described formulas (6) and (7), the embodiments of the present applicationThe calculation method is not limited to the formula (8), and other calculation methods may be used, which are not described herein for brevity.
Therefore, the terminal can also acquire the data by acquiringOr
To indirectly obtain
In order to maintain high-precision time synchronization with network equipment, for example, synchronization error is required to be within ± 500 nanoseconds (ns), the terminal needs to make a clock adjustment periodically to overcome crystal oscillator drift. That is, the uplink and downlink time signals are transmitted periodically and the clock deviation T is obtainedoffsetThe network equipment can send the time service signal to the terminal in time after receiving the time service signalOr
For convenience of description, in the embodiments of the present application, the following will be given
Andcan be at the first indication messageThe information indicates that the first indication information is the time deviation between the actual time and the ideal time when the network equipment detects the uplink timing signal.
It should be understood that, in the embodiment of the present application, the clock system of the network device may operate according to a standard of a coordinated Universal Time (UTC) clock or a Global Navigation Satellite System (GNSS) clock; the UTC clock identifies time (or records time information) by using a UTC time system, and the GNSS clock identifies time by using a GNSS time system; the 3GPP clock is a time representation mode defined by a wireless communication system based on an LTE/5G NR wireless frame structure.
Fig. 5 shows a schematic flowchart of a method 200 for clock synchronization according to an embodiment of the present application, and as shown in fig. 5, an execution subject of the method 200 may be a device for clock synchronization (e.g., a terminal or a chip or a device for a terminal, a network device or a chip or a device for a network device), and the following description is made with the execution subject being a terminal and a network device, where the method 200 includes:
s210, the terminal sends a first uplink signal to the network device, and the network device receives the first uplink signal sent by the terminal.
Optionally, the first uplink signal includes but is not limited to: sounding Reference Signal (SRS), demodulation reference signal (DMRS), Phase Tracking Reference Signal (PTRS), Physical Random Access Channel (PRACH), or a newly designed dedicated reference signal, and the like.
It should be understood that the first uplink signal may correspond to the uplink timing signal in fig. 4.
Optionally, before S210, the method further includes:
s201, the network device sends a downlink signal to the terminal, and the terminal receives the downlink signal sent by the network device.
Optionally, the downlink signal includes but is not limited to: a Physical Downlink Control Channel (PDCCH), a DMRS on a Physical Downlink Shared Channel (PDSCH), a channel state information-reference signal (CSI-RS), a tracking reference signal (CSI-RS for tracking/TRS), a Primary Synchronization Signal (PSS) on a Synchronization Signal Block (SSB), a Secondary Synchronization Signal (SSS), the DMRS, or the PTRS.
It is to be understood that the downlink signal may correspond to the downlink timing signal in fig. 4.
It should also be understood that the terminal receives the downlink signal transmitted by the network device in the downlink time unit.
S220, the network device sends first indication information to the terminal, the terminal receives the first indication information sent by the network device, and the first indication information is used to indicate a time offset between a time when the first uplink signal actually reaches the network device and a time when the first uplink signal is expected to reach the network device.
It should be understood that the time when the first uplink signal is expected to reach the network device may also be understood as a target arrival time of the first uplink signal, or the time when the first uplink signal is expected to reach the network device may also be understood as a time when the boundary of the first time unit estimated by the network device or the terminal is expected to reach the network device.
It is also understood that the boundary of the first time cell may be a starting boundary or an ending boundary of the first time cell.
In this embodiment, the time unit may be a radio frame, a subframe, a slot, a micro slot (mini slot), an OFDM symbol defined in an LTE or 5G NR system, or may be a time window formed by multiple frames or subframes, for example, a System Information (SI) window.
Specifically, after receiving the first uplink signal sent by the terminal, the network device may determine an actual receiving time of the first uplink signal (e.g., as shown in fig. 4)
) And determining first indication information, wherein the first indication information is used for indicating the time offset between the time when the first uplink signal actually reaches the network equipment and the time when the first uplink signal is expected to reach the network equipment.
Optionally, the first indication information may indicate a time when the first uplink signal actually reaches the network device and a time when the first time unit estimated by the network device or the terminal is expected to reach the network device (e.g., the time in fig. 4)) The time offset between (e.g.,
)。
it should be understood that Δ t is the time offset under the network device clock system, and may be the time offset under the UTC or GNSS clock system, for example.
Optionally, the time offset is an offset between a sampling point of a time when the first uplink signal actually reaches the network device and a sampling point of a time when the first uplink signal is expected to reach the network device (for example, the time offset may be represented as N)diff)。
It is to be understood that NdiffTiming the time offset, N, for the 3GPP air interface framediffThe reason for this is the signal transmission time PULAnd PDLOr of N, ordiffThe error indicating the TA adjustment amount can be understood as correction of the TA adjustment amount so that the TA notification accuracy is higher. It is also understood that Δ t includes NdiffThe time offset generated by the difference between the timing frequency of the clock system of the network device and the timing frequency of the 3GPP air interface frame timing system also includes the time offset occurring in the interval time period between the downlink signal reception and the first uplink signal transmission. If the hardware of the network device is sufficiently ideal, this deviation is in the order of ns, so Δ t and NdiffCan be approximately considered as consistent.
Optionally, the sending, by the network device, the first indication information to the terminal includes:
the network device sends the first indication information to the terminal by adopting a first period.
Optionally, the first period is a period in which the terminal transmits an uplink signal.
Specifically, the first uplink signal sent by the terminal in S210 may correspond to the first indication information determined by the network device in S220 in a one-to-one manner, so that a sending mechanism of the first indication information may be determined according to a mechanism of a clock synchronization procedure, and the first indication information may be sent periodically or non-periodically.
For example, when the clock synchronization procedure is aperiodic and temporarily configured (for example, when the terminal starts time synchronization, the aperiodic clock synchronization procedure may be initiated once and then transited to periodic synchronization), the transmission of the first indication information may also be aperiodic.
For another example, when the clock synchronization flow is performed periodically, the transmission of the first indication information is also periodic, and the periods of both may be the same.
According to the clock synchronization method, the network equipment periodically sends the time deviation to the terminal, and the terminal can periodically obtain the time deviation, so that clock synchronization is performed, and the requirement of high-precision clock synchronization between the network equipment and the terminal is met.
Optionally, the sending, by the network device, the first indication information to the terminal includes: in a second time unit, the network equipment sends the first indication information to the terminal, and the terminal receives the first indication information sent by the network equipment; wherein the second time unit is the Nth time unit after the first time unit; or, the second time unit is the nth available time unit after the first time unit; or, the second time unit is the first available time unit after the nth time unit, and N is a positive integer greater than or equal to 1.
For example, if N is 2, the time unit is a time slot, and the second time unit is an nth time unit after the first time unit, the network device may send the first indication information to the terminal at a third time slot after receiving the first uplink signal at the first time slot.
Optionally, the network device sends the first indication information to the terminal at the first time resource location of the second time unit.
For example, the first time resource location may be some number of symbols in the third slot.
Optionally, N is configured by the network device, or N is predefined by the protocol.
Optionally, the network device sends the first indication information in a first time window after receiving the first uplink signal.
Optionally, the time length, the occurrence period, and the time offset relative to the first uplink signal of the first time window are configured by the network device or predefined by a protocol.
Optionally, the first indication information may be carried in Downlink Control Information (DCI), a medium access control element (MAC CE), or Radio Resource Control (RRC) signaling.
It should be understood that, in consideration of the real-time property of the first indication information and the flexibility of information transmission, an alternative scheme is that the first indication information is carried in the MAC CE.
Optionally, the method further comprises: the network device sends second indication information to the terminal, and the terminal receives the second indication information sent by the network device, wherein the second indication information comprises information used for indicating the granularity of the time deviation.
It is to be understood that the second indication information comprising information indicating the granularity of the time offset may also be understood as comprising a field in the second indication information indicating the granularity of the time offset.
Optionally, the granularity of the time offset is a positive integer number ns or 2μTCOr TsWherein 2 isμIs the magnification factor, T, of the system sampling periodCIs defined in NRMinimum sampling time period, μ being a positive integer and the size of μ being determined by the subcarrier spacing and the communication system bandwidth, TsBasic time Unit, T, defined for LTEsEqual to 1/(15000 × 2048) seconds.
Optionally, the time offset has a granularity of 100ns, 50ns, 10ns, and 2 nsμTCOr Ts。
Optionally, a time offset (Δ t or N)diff) And the granularity of the time offset may be carried in the same signaling, for example, both the granularity of the time offset and the time offset are carried in the MAC CE; the time offset and the granularity of the time offset may also be carried in different signaling, e.g. the time offset is carried in the MAC CE and the granularity of the time offset is carried in the RRC signaling.
In a possible implementation manner, in an initial stage of high-precision time synchronization, the network device indicates granularity of time offset through RRC signaling, and after receiving the uplink signal, the network device uses the MAC CE to send the first indication information.
Optionally, the granularity of the time offset is implicitly determined by the terminal and the network device through known parameters.
For example, the terminal and the network device determine the granularity of the corresponding time offset according to the accuracy requirement of time synchronization or parameters such as the bandwidth of the uplink signal.
According to the clock synchronization method, the terminal can obtain the time deviation with fine granularity, and the clock synchronization precision can be met.
Optionally, the first indication information further includes information of a type of the time offset.
For example, the network device may add an identifier to the first indication information, the identifier being used for Δ t and NdiffA distinction is made.
Optionally, the first indication information further includes information for indicating a time-frequency resource of the first uplink signal; or, the first indication information further includes information for indicating frequency domain resources of the first uplink signal; or, the first indication information further includes information for indicating a time domain resource of the first uplink signal.
The information of the time domain resource may be an identifier of the time domain resource, the information of the frequency domain resource may be an identifier of the frequency domain resource, and the information of the time frequency resource may be an identifier of the time frequency resource.
When the terminal sends a plurality of uplink signals to the network device, where the plurality of uplink signals include the first uplink signal, the network device may add information of a time domain resource and/or a frequency domain resource of the first uplink signal in the first indication information, so that the terminal determines that the time offset in the first indication information is obtained by sending the first uplink signal by the terminal.
Optionally, the triggering manner of the first indication information may be uplink signal triggering, or may be conditional triggering.
Mode one (uplink signal trigger)
And if the triggering mode of the first indication information is uplink signal triggering, the network equipment sends the first indication information to the terminal within a certain time period after receiving the first uplink signal.
Mode two (conditional trigger)
If the triggering mode of the first indication information is conditional triggering, the network device determines the time deviation, and then judges whether the time deviation is greater than or equal to a first time threshold, if the time deviation is greater than or equal to the first time threshold, the network device sends the first indication information to the terminal; if the time deviation is smaller than the first time threshold, the network device does not send the first indication information.
For example, if the time offset Δ t is 50ns and the first time threshold is 100ns, the network device does not send the first indication information to the terminal.
It should be understood that, after determining the time deviation, the network device may further determine whether the time deviation is greater than a first time threshold, and if the time deviation is greater than the first time threshold, the network device sends the first indication information to the terminal; if the time deviation is less than or equal to the first time threshold, the network device does not send the first indication information.
Optionally, the first time threshold is determined by factors such as accuracy of time synchronization or hardware implementation of the network device, and may be determined by the network device, or implicitly determined by the terminal and the network device through known parameters.
For example, the terminal and the network device may determine the first time threshold according to the bandwidth of the uplink signal; since the larger the uplink channel bandwidth is, the more accurate the detection result of the system is, the first time threshold may be correspondingly reduced.
For another example, the terminal and the network device may further determine the first time threshold according to different synchronization accuracy requirements.
And S230, the terminal performs clock synchronization according to the time deviation.
Specifically, the terminal corrects the local clock after receiving the first indication information.
For example, when the time deviation is the time deviation Δ t under the clock system of the network device, the time correction method calculates the time deviation between the clocks of the network device and the terminal as shown in equation (9):
for another example, when the time offset is the time offset N in the 3GPP air interface frame timing systemdiffThe time correction is performed according to the formula (10):
wherein the content of the first and second substances,
time information on the clock system of the network device representing the time corresponding to the downlink time cell boundary estimated by the terminal, NTAAnd informing the terminal of the advance of the first uplink signal sent by the network equipment, wherein the advance is used for compensating the sum of the propagation delays of the downlink channel and the uplink channel.The terminal is based onAnd the time displayed by the local clock of the terminalIs time synchronized, i.e. by
Determination of ToffsetThe terminal is determining ToffsetThen, through ToffsetTo correct the time of the clock display of the terminal
Or the terminal is estimated
Then, directly mix
The clock of the terminal is written.
It should be understood that the time offset Δ t under the clock system of the network device and the time offset N under the timing time system of the 3GPP air interface framediffAre interchangeable.
It should also be understood that the same dimension should be used in calculating the time offset if the first indicator indicates that the time offset has a granularity of 2μTCThen the terminal should set N before the terminal corrects the local clockdiffConversion to particle size in seconds.
It should also be understood that the terminal monitors the first indication information within a period of time after the first uplink signal is transmitted, and if the first indication information is received, the terminal monitors the first indication information according to Δ t or N thereindiffAnd the time synchronization formula (9) or (10) performs clock correction; if the corresponding information is not received, considering delta t or Ndiff0, no correction is made.
Optionally, the method further comprises: and the terminal adjusts the transmission advance of the second uplink signal according to the time deviation.
The second uplink signal may be a next uplink signal to be sent after the terminal sends the first uplink signal.
When the transmit and receive antenna parameter configurations of the first uplink signal and the second uplink signal are the same or satisfy the channel correlation property, the time offset may be applied to adjust the transmit advance of the second uplink signal.
Specifically, if the first indication information indicates NdiffThen, the terminal may further adjust the transmission advance of the second uplink signal according to the time offset, and the terminal may adjust the transmission advance of the second uplink signal to (N)TA+Ndiff)×TS。
The method for clock synchronization according to the embodiment of the present application is described in detail above with reference to fig. 1 to 5, and the apparatus, the terminal and the network device for clock synchronization according to the embodiment of the present application are described in detail below with reference to fig. 6 to 9.
The embodiment of the application also provides a device for realizing any one of the methods. For example, there is provided an apparatus comprising means for performing each step performed by a terminal in any one of the above methods. For another example, another apparatus is also provided, which includes means for performing each step performed by a network device in any one of the above methods.
Fig. 6 shows a schematic block diagram of an apparatus 300 for clock synchronization provided in this embodiment of the application, where the apparatus 300 may correspond to the terminal described in the method 200, and may also correspond to a chip or a component of the terminal, and each module or unit in the apparatus 300 may be respectively configured to perform each action or process performed by the terminal in the method 200, as shown in fig. 6, the apparatus 300 for clock synchronization may include a processing unit 310, a sending unit 320, and a receiving unit 330.
Specifically, the processing unit 310 is configured to generate a first uplink signal;
the sending unit 320 is configured to send a first uplink signal to the network device;
the receiving unit 330 is configured to receive first indication information from the network device, where the first indication information is used to indicate a time offset between a time when the first uplink signal actually arrives at the network device and a time when the first uplink signal is expected to arrive at the network device;
the processing unit 310 is further configured to perform clock synchronization according to the time offset.
It should be understood that for the specific processes of the units in the apparatus 300 to execute the above corresponding steps, reference is made to the foregoing description in conjunction with the method embodiment of fig. 5, and for brevity, no further description is provided here.
It should also be understood that, if the apparatus 300 for clock synchronization is a chip in a terminal, a processing unit in the chip may generate a clock synchronization instruction according to the first indication information and send the clock synchronization instruction to a clock synchronization unit of the terminal for clock synchronization.
Fig. 7 shows a schematic block diagram of an apparatus 400 for clock synchronization provided in this embodiment of the application, where the apparatus 400 may correspond to the network device described in the method 200, and may also correspond to a chip or a component of the network device, and each module or unit in the apparatus 400 may be respectively configured to execute each action or process performed by the network device in the method 200, as shown in fig. 7, the apparatus 400 for clock synchronization may include a receiving unit 410, a processing unit 420, and a sending unit 430.
Specifically, the receiving unit 410 is configured to receive a first uplink signal from a terminal;
the processing unit 420 is configured to control the sending unit 430 to send first indication information to the terminal, where the first indication information is used to indicate a time offset between a time when the first uplink signal actually reaches the network device and a time when the first uplink signal is expected to reach the network device, and the time offset is used for the terminal to perform clock synchronization.
It should be understood that for the specific processes of the units in the apparatus 400 to execute the corresponding steps, reference is made to the description of the method embodiment in conjunction with fig. 5, and for brevity, no further description is provided here.
It should also be understood that the division of the units in the above apparatus is only a division of logical functions, and the actual implementation may be wholly or partially integrated into one physical entity, or may be physically separated. And the units in the device can be realized in the form of software called by the processing element; or may be implemented entirely in hardware; part of the units can also be realized in the form of software called by a processing element, and part of the units can be realized in the form of hardware. For example, each unit may be a processing element separately set up, or may be implemented by being integrated into a chip of the apparatus, or may be stored in a memory in the form of a program, and a function of the unit may be called and executed by a processing element of the apparatus. The processing element described herein, which may also be referred to as a processor, may be an integrated circuit having signal processing capabilities. In the implementation process, the steps of the method or the units above may be implemented by integrated logic circuits of hardware in a processor element or in a form called by software through the processor element.
In one example, the units in any of the above apparatuses may be one or more integrated circuits configured to implement the above methods, such as: one or more Application Specific Integrated Circuits (ASICs), or one or more Digital Signal Processors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs), or a combination of at least two of these integrated circuit forms. As another example, when a unit in a device may be implemented in the form of a processing element scheduler, the processing element may be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor capable of invoking programs. As another example, these units may be integrated together and implemented in the form of a system-on-a-chip (SOC).
Fig. 8 shows a schematic structural diagram of a terminal provided in an embodiment of the present application. It may be the terminal in the above embodiment, for implementing the operation of the terminal in the above embodiment. As shown in fig. 8, the terminal includes: antenna 510, radio frequency device 520, signal processing section 530. The antenna 510 is connected to a radio frequency device 520. In the downlink direction, the rf device 520 receives information transmitted by the network device through the antenna 510, and transmits the information transmitted by the network device to the signal processing part 530 for processing. In the uplink direction, the signal processing part 530 processes the information of the terminal and sends the information to the radio frequency device 520, and the radio frequency device 520 processes the information of the terminal and sends the information to the network device through the antenna 510.
The signal processing part 530 may include a modem subsystem for implementing processing of each communication protocol layer of data; the system also comprises a central processing subsystem used for realizing the processing of a terminal operating system and an application layer; in addition, other subsystems, such as a multimedia subsystem for implementing control of a terminal camera, a screen display, etc., peripheral subsystems for implementing connection with other devices, and the like may be included. The modem subsystem may be a separate chip. Alternatively, the above means for the terminal may be located at the modem subsystem.
The modem subsystem may include one or more processing elements 531, including, for example, a main control CPU and other integrated circuits. The modem subsystem may also include a storage element 532 and an interface circuit 533. The memory element 532 is used to store data and programs, but programs for performing the methods performed by the terminal in the above methods may not be stored in the memory element 532, but rather in a memory external to the modem subsystem. The interface circuit 533 is used to communicate with other subsystems. The above apparatus for a terminal may be located in a modem subsystem, which may be implemented by a chip comprising at least one processing element for performing the steps of any of the methods performed by the above terminal and interface circuitry for communicating with other apparatus. In one implementation, the unit of the terminal for implementing the steps of the above method may be implemented in the form of a processing element scheduler, for example, an apparatus for the terminal includes a processing element and a storage element, and the processing element calls a program stored in the storage element to execute the method executed by the terminal in the above method embodiment. The memory elements may be memory elements with the processing elements on the same chip, i.e. on-chip memory elements.
In another implementation, the program for performing the method performed by the terminal in the above method may be a memory element on a different chip than the processing element, i.e. an off-chip memory element. At this time, the processing element calls or loads a program from the off-chip storage element onto the on-chip storage element to call and execute the method executed by the terminal in the above method embodiment.
In yet another implementation, the unit of the terminal implementing the steps of the above method may be configured as one or more processing elements disposed on the modem subsystem, where the processing elements may be integrated circuits, for example: one or more ASICs, or one or more DSPs, or one or more FPGAs, or a combination of these types of integrated circuits. These integrated circuits may be integrated together to form a chip.
The units of the terminal implementing the steps of the above method may be integrated together and implemented in the form of a system-on-a-chip (SOC) chip for implementing the above method.
Fig. 9 is a schematic structural diagram of a network device according to an embodiment of the present application. For implementing the operation of the network device in the above embodiments. As shown in fig. 9, the network device includes: antenna 601, radio frequency device 602, baseband device 603. The antenna 601 is connected to a radio frequency device 602. In the uplink direction, rf device 602 receives information transmitted by the terminal through antenna 601, and transmits the information transmitted by the terminal to baseband device 603 for processing. In the downlink direction, the baseband device 603 processes the information of the terminal and sends the information to the rf device 602, and the rf device 602 processes the information of the terminal and sends the processed information to the terminal through the antenna 601.
In another implementation, the unit of the network device for implementing the steps of the above method may be configured as one or more processing elements, which are disposed on the baseband apparatus, where the processing elements may be integrated circuits, for example: one or more ASICs, or one or more DSPs, or one or more FPGAs, or a combination of these types of integrated circuits. These integrated circuits may be integrated together to form a chip.
The units of the network device for implementing the steps of the above method may be integrated together and implemented in the form of a system on chip, for example, a baseband device includes the SOC chip for implementing the above method.
The terminal and the network device in the above-mentioned various device embodiments may completely correspond to the terminal or the network device in the method embodiment, and the corresponding module or unit performs the corresponding steps, for example, when the device is implemented in the form of a chip, the receiving unit may be an interface circuit of the chip for receiving signals from other chips or devices. The above unit for transmitting is an interface circuit of the apparatus for transmitting a signal to other apparatuses, for example, when the apparatus is implemented in the form of a chip, the transmitting unit is an interface circuit of the chip for transmitting a signal to other chips or apparatuses.
An embodiment of the present application further provides a communication system, including: the terminal and the network device.
It will be appreciated that the memory in the embodiments of the subject application can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. The non-volatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. Volatile memory can be Random Access Memory (RAM), which acts as external cache memory. There are many different types of RAM, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), double data rate SDRAM (DDR SDRAM), Enhanced SDRAM (ESDRAM), synchlink DRAM (SLDRAM), and direct bus RAM (DR RAM).
It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
Additionally, the terms "system" and "network" are often used interchangeably herein. The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The appearances of the phrases "first," "second," and the like in this application are only for purposes of distinguishing between different items and the phrases "first," "second," and the like do not by themselves limit the actual order or function of the items so modified. Any embodiment or design described herein as "exemplary," e.g., "optional design" or "one design" is not to be construed as preferred or advantageous over other embodiments or designs. Rather, use of these words is intended to present relevant concepts in a concrete fashion.
The terms "upstream" and "downstream" appearing in the present application are used to describe the direction of data/information transmission in a specific scenario, for example, the "upstream" direction generally refers to the direction of data/information transmission from the terminal to the network side, or the direction of transmission from the distributed unit to the centralized unit, and the "downstream" direction generally refers to the direction of data/information transmission from the network side to the terminal, or the direction of transmission from the centralized unit to the distributed unit.
Various objects such as various messages/information/devices/network elements/systems/devices/actions/operations/procedures/concepts may be named in the present application, it is to be understood that these specific names do not constitute limitations on related objects, and the named names may vary according to circumstances, contexts, or usage habits, and the understanding of the technical meaning of the technical terms in the present application should be mainly determined by the functions and technical effects embodied/performed in the technical solutions.
The above embodiments may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product may include one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic disk), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (19)
1. A method of clock synchronization, comprising:
sending a first uplink signal to the network equipment;
receiving first indication information from the network device, where the first indication information is used to indicate a time deviation between a time when the first uplink signal actually reaches the network device and a time when the first uplink signal is expected to reach the network device;
and performing clock synchronization according to the time deviation.
2. The method of claim 1, wherein receiving the first indication information from the network device comprises:
receiving the first indication information from the network equipment at a second time unit;
the second time unit is an nth time unit after the first time unit, or the second time unit is an nth available time unit after the first time unit, or the second time unit is a first available time unit after the nth time unit, the first time unit is a time unit for transmitting the first uplink signal, and N is a positive integer greater than or equal to 1.
3. The method according to claim 1 or 2, characterized in that the method further comprises:
and adjusting the transmission advance of the second uplink signal according to the time deviation.
4. The method according to any of claims 1-3, wherein the first indication information further comprises information indicating time-frequency resources of the first uplink signal; or, the first indication information further includes information for indicating frequency domain resources of the first uplink signal; or, the first indication information further includes information for indicating a time domain resource of the first uplink signal.
5. The method according to any one of claims 1-4, further comprising:
receiving second indication information from the network device, the second indication information including information indicating a granularity of the time offset.
6. The method according to any of claims 1-5, wherein the first indication information is carried in downlink control information, DCI, media access control layer control element, MAC CE, or radio resource control, RRC, signaling.
7. A method of clock synchronization, comprising:
receiving a first uplink signal from a terminal;
and sending first indication information to the terminal, wherein the first indication information is used for indicating the time deviation between the time when the first uplink signal actually reaches the network equipment and the time when the first uplink signal is expected to reach the network equipment, and the time deviation is used for the terminal to perform clock synchronization.
8. The method of claim 7, wherein the sending the first indication information to the terminal comprises:
sending the first indication information to the terminal in a second time unit;
the second time unit is an nth time unit after the first time unit, or the second time unit is an nth available time unit after the first time unit, or the second time unit is a first available time unit after the nth time unit, the first time unit is a time unit for transmitting the first uplink signal, and N is a positive integer greater than or equal to 1.
9. The method according to claim 7 or 8, wherein the sending the first indication information to the terminal comprises:
and when the time deviation is greater than or equal to a first time threshold value, sending the first indication information to the terminal.
10. The method according to any of claims 7-9, wherein the first indication information further comprises information indicating time-frequency resources of the first uplink signal; or, the first indication information further includes information for indicating frequency domain resources of the first uplink signal; or, the first indication information further includes information for indicating a time domain resource of the first uplink signal.
11. The method according to any one of claims 7-10, further comprising:
and sending second indication information to the terminal, wherein the second indication information comprises information used for indicating the granularity of the time deviation.
12. The method according to any of claims 7-11, wherein the first indication information is carried in downlink control information, DCI, media access control layer control element, MAC CE, or radio resource control, RRC, signaling.
13. An apparatus for clock synchronization, comprising means for performing the steps of the method according to any one of claims 1 to 6.
14. An apparatus for clock synchronization, comprising means for performing the steps of the method according to any of claims 7-12.
15. An apparatus for clock synchronization, comprising at least one processor and an interface circuit, the at least one processor being configured to perform the method of any one of claims 1-6.
16. An apparatus for clock synchronization, comprising at least one processor and an interface circuit, the at least one processor being configured to perform the method of any one of claims 7-12.
17. A terminal, characterized in that it comprises the apparatus according to claim 13 or 15.
18. A base station, characterized in that it comprises the apparatus of claim 14 or 16.
19. A storage medium, comprising a program which, when executed by a processor, performs the method of any one of claims 1-12.
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| PCT/CN2019/093542 WO2020001585A1 (en) | 2018-06-28 | 2019-06-28 | Clock synchronisation method and apparatus |
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| CN201810688385.3A CN110662283A (en) | 2018-06-28 | 2018-06-28 | Clock synchronization method and device |
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| CN111294134A (en) * | 2020-02-04 | 2020-06-16 | 北京邮电大学 | Time service method and device and electronic equipment |
| CN111770565A (en) * | 2020-06-23 | 2020-10-13 | 中国科学院上海微系统与信息技术研究所 | Timing advance adjusting method for non-ground network |
| CN113115427A (en) * | 2020-01-10 | 2021-07-13 | 广东电网有限责任公司电力科学研究院 | Power quality monitoring equipment and power quality data transmission method and device thereof |
| WO2021147090A1 (en) * | 2020-01-23 | 2021-07-29 | 华为技术有限公司 | Time synchronization method, access network device, communication apparatus, computer storage medium and communication system |
| 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 |
| CN113419598A (en) * | 2021-05-18 | 2021-09-21 | 武汉中海庭数据技术有限公司 | Clock synchronization system and method for multi-SOC (system on chip) |
| WO2021208751A1 (en) * | 2020-04-15 | 2021-10-21 | 华为技术有限公司 | Time synchronization method and device |
| WO2022027225A1 (en) * | 2020-08-04 | 2022-02-10 | 华为技术有限公司 | Uplink timing method and apparatus |
| CN114222360A (en) * | 2021-12-21 | 2022-03-22 | 南京欧珀软件科技有限公司 | Time synchronization method, system and related device |
| CN114391283A (en) * | 2021-12-10 | 2022-04-22 | 北京小米移动软件有限公司 | Synchronization method, device, equipment and storage medium |
| WO2022082514A1 (en) * | 2020-10-21 | 2022-04-28 | 华为技术有限公司 | Communication method and apparatus |
| CN115002894A (en) * | 2022-08-03 | 2022-09-02 | 杰创智能科技股份有限公司 | Uplink timing synchronization method, device, equipment and storage medium |
| WO2023179172A1 (en) * | 2022-03-23 | 2023-09-28 | 华为技术有限公司 | Communication method and apparatus |
| WO2023231465A1 (en) * | 2022-05-31 | 2023-12-07 | 华为技术有限公司 | Time synchronization method, communication apparatus and communication system |
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| CN113115427A (en) * | 2020-01-10 | 2021-07-13 | 广东电网有限责任公司电力科学研究院 | Power quality monitoring equipment and power quality data transmission method and device thereof |
| WO2021147090A1 (en) * | 2020-01-23 | 2021-07-29 | 华为技术有限公司 | Time synchronization method, access network device, communication apparatus, computer storage medium and communication system |
| CN111294134B (en) * | 2020-02-04 | 2021-04-20 | 北京邮电大学 | Time service method and device and electronic equipment |
| CN111294134A (en) * | 2020-02-04 | 2020-06-16 | 北京邮电大学 | Time service method and device and electronic equipment |
| WO2021208751A1 (en) * | 2020-04-15 | 2021-10-21 | 华为技术有限公司 | Time synchronization method and device |
| CN111770565A (en) * | 2020-06-23 | 2020-10-13 | 中国科学院上海微系统与信息技术研究所 | Timing advance adjusting method for non-ground network |
| WO2022027225A1 (en) * | 2020-08-04 | 2022-02-10 | 华为技术有限公司 | Uplink timing method and apparatus |
| WO2022082514A1 (en) * | 2020-10-21 | 2022-04-28 | 华为技术有限公司 | Communication method and apparatus |
| CN113419598A (en) * | 2021-05-18 | 2021-09-21 | 武汉中海庭数据技术有限公司 | Clock synchronization system and method for multi-SOC (system on chip) |
| 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 |
| CN114391283A (en) * | 2021-12-10 | 2022-04-22 | 北京小米移动软件有限公司 | Synchronization method, device, equipment and storage medium |
| CN114222360A (en) * | 2021-12-21 | 2022-03-22 | 南京欧珀软件科技有限公司 | Time synchronization method, system and related device |
| CN114222360B (en) * | 2021-12-21 | 2023-09-12 | 南京欧珀软件科技有限公司 | Time synchronization method, system and related device |
| WO2023179172A1 (en) * | 2022-03-23 | 2023-09-28 | 华为技术有限公司 | Communication method and apparatus |
| WO2023231465A1 (en) * | 2022-05-31 | 2023-12-07 | 华为技术有限公司 | Time synchronization method, communication apparatus and communication system |
| CN115002894A (en) * | 2022-08-03 | 2022-09-02 | 杰创智能科技股份有限公司 | Uplink timing synchronization method, device, equipment and storage medium |
| CN115002894B (en) * | 2022-08-03 | 2022-11-01 | 杰创智能科技股份有限公司 | Uplink timing synchronization method, device, equipment and storage medium |
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