WO2019095575A1 - 一种时间同步方法及装置 - Google Patents
一种时间同步方法及装置 Download PDFInfo
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- WO2019095575A1 WO2019095575A1 PCT/CN2018/076780 CN2018076780W WO2019095575A1 WO 2019095575 A1 WO2019095575 A1 WO 2019095575A1 CN 2018076780 W CN2018076780 W CN 2018076780W WO 2019095575 A1 WO2019095575 A1 WO 2019095575A1
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- time
- terminal device
- message
- access network
- network device
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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
- H04W56/006—Synchronisation arrangements determining timing error of reception due to propagation delay using known positions of transmitter and receiver
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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
- H04W56/001—Synchronization between nodes
- H04W56/0015—Synchronization between nodes one node acting as a reference for the others
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
- H04W56/005—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by adjustment in the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/20—Manipulation of established connections
- H04W76/27—Transitions between radio resource control [RRC] states
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
- H04W80/02—Data link layer protocols
Definitions
- the present invention relates to the field of wireless communication technologies, and in particular, to a time synchronization method and apparatus.
- Time synchronization also known as clock synchronization
- the embodiment of the present application provides a time synchronization method for solving a technical problem that time synchronization is not accurate enough.
- an embodiment of the present application provides a time synchronization method, where the method includes:
- the terminal device acquires a first transmission delay, and acquires a fourth time according to the first transmission delay and the time information;
- the terminal device synchronizes the clock of the terminal device according to the fourth time.
- the terminal device before the terminal device receives the first indication message sent by the access network device, the terminal device sends a request message to the access network device, where the request message includes at least the following An item: demand information of the time information, granularity requirement information of the time information, QoS information of the terminal device supporting the service, and a time type requested by the terminal device.
- the first indication message further includes at least one of the following:
- the request message is a radio resource control RRC message or a medium access control control element MAC CE message or a random access request message.
- the acquiring, by the terminal device, the first transmission delay includes:
- the terminal device acquires uplink timing advance information, and acquires the first transmission delay according to the uplink timing advance information.
- the acquiring, by the terminal device, the uplink timing advance information includes:
- the terminal device receives the access network device to send a third indication message, where the third indication message includes uplink timing advance adjustment information, and the terminal device updates the information according to the previous uplink timing advance information and the uplink timing advance adjustment information. Current uplink timing advance information of the terminal device.
- the second indication message is a random access request response message or an RRC message or a MAC CE
- the third indication message is a MAC CE message or an RRC message.
- the receiving, by the terminal device, the first indication message sent by the access network device includes:
- the terminal device receives the first indication message sent by the access network device by means of broadcast or unicast or multicast.
- an embodiment of the present application provides a time synchronization method, where the method includes:
- the access network device determines time information
- the access network device sends a first indication message to the terminal device, where the first indication message includes time information, and the time information is used to synchronize the clock of the terminal device.
- the access network device determines time information, including:
- the access network device receives the request message of the terminal device, where the request message includes at least one of: requirement information of the time information, granularity requirement information of the time information, and QoS information of the terminal device supporting the service, The type of time requested by the terminal device;
- the access network device determines time information according to the request message.
- the access network device determines time information, including:
- the access network device obtains first indication information that is sent by the core network device, where the first indication information includes granularity requirement information of the time information and/or QoS information of the terminal device supporting service, where the access network device is configured according to The first indication information determines time information.
- the first indication message further includes at least one of the following:
- the request message is a radio resource control RRC message or a medium access control control element MAC CE message or a random access request message.
- the sending, by the access network device, the first indication message to the terminal device includes:
- the access network device sends a first indication message to the terminal device by means of broadcast or unicast or multicast.
- the method before the sending, by the access network device, the first indication message to the terminal device, the method further includes:
- the access network device receives the authorization information sent by the core network device, where the authorization information is used to indicate whether the terminal device can obtain the time information;
- the access network device sends the first indication message to the terminal device;
- the access network device does not send the first indication message to the terminal device.
- an embodiment of the present application provides a time synchronization method, where the method includes:
- the terminal device receives the first indication message sent by the access network device, where the first indication message includes time information of the terminal device, and the granularity of the time information is 1 us or 100 ns or 1 ms;
- the terminal device synchronizes the clock of the terminal device according to the time information.
- an embodiment of the present application provides a time synchronization method, where the method includes:
- the access network device determines time information, and the granularity of the time information is 1 us or 100 ns or 1 ms;
- the access network device sends a first indication message to the terminal device, where the first indication message includes the time information.
- the embodiment of the present application provides a terminal device, where the terminal device includes:
- a transceiver module configured to receive a first indication message sent by the access network device, where the first indication message includes time information
- a processing module configured to acquire a first transmission delay, and acquire a fourth time according to the first transmission delay and the time information; and synchronize a clock of the terminal device according to the fourth time.
- the transceiver module before receiving the first indication message sent by the access network device, is further configured to: send a request message to the access network device, where the request message includes at least the following An item: demand information of the time information, granularity requirement information of the time information, QoS information of the terminal device supporting the service, and a time type requested by the terminal device.
- the first indication message further includes at least one of the following:
- the request message is a radio resource control RRC message or a medium access control control element MAC CE message or a random access request message.
- the processing module is specifically configured to:
- the processing module is specifically configured to:
- the receiving access network device sends a third indication message, where the third indication message includes uplink timing advance adjustment information, and updates the current uplink timing advance information of the terminal device according to the previous uplink timing advance information and the uplink timing advance adjustment information. .
- the second indication message is a random access request response message or an RRC message or a MAC CE
- the third indication message is a MAC CE message or an RRC message.
- the transceiver module is specifically configured to:
- the first indication message sent by the access network device is received by means of broadcast or unicast or multicast.
- an embodiment of the present application provides an access network device, where the access network device includes:
- a processing module configured to determine time information
- the transceiver module is configured to send a first indication message to the terminal device, where the first indication message includes time information, where the time information is used to synchronize a clock of the terminal device.
- the transceiver module is further configured to: receive a request message of the terminal device, where the request message includes at least one of: requirement information of the time information, and a granularity requirement of the time information.
- the request message includes at least one of: requirement information of the time information, and a granularity requirement of the time information.
- the processing module is specifically configured to: determine time information according to the request message.
- the transceiver module is further configured to: obtain first indication information sent by the core network device, where the first indication information includes granularity requirement information of the time information and/or a terminal device supporting service QoS information;
- the processing module is specifically configured to: determine time information according to the first indication information.
- the first indication message further includes at least one of the following:
- a time type the time type corresponding to at least one of universal time coordinated (UTC), global positioning system (GPS) time, and local time.
- UTC universal time coordinated
- GPS global positioning system
- the request message is a radio resource control RRC message or a medium access control control element MAC CE message or a random access request message.
- the transceiver module is specifically configured to:
- the first indication message is sent to the terminal device by means of broadcast or unicast or multicast.
- the transceiver module before the sending and receiving module sends the first indication message to the terminal device, the transceiver module is further configured to:
- the access network device sends the first indication message to the terminal device;
- the access network device does not send the first indication message to the terminal device.
- the embodiment of the present application provides a terminal device, where the terminal device includes:
- the transceiver module is configured to receive a first indication message sent by the access network device, where the first indication message includes time information of the terminal device, and the granularity of the time information is 1 us or 100 ns or 1 ms;
- a processing module configured to synchronize a clock of the terminal device according to the time information.
- an embodiment of the present application provides an access network device, where the access network device includes:
- a processing module configured to determine time information, the granularity of the time information is 1 us or 100 ns or 1 ms;
- the transceiver module is configured to send a first indication message to the terminal device, where the first indication message includes the time information.
- the application also provides a time synchronization method, the method comprising:
- the terminal device acquires a first transmission delay, and acquires a fourth time according to the first transmission delay and the first time;
- the terminal device synchronizes the clock of the terminal device according to the fourth time.
- the first time includes a second time and a third time
- the second time is a millisecond time
- the third time is a microsecond time or a nanosecond time.
- the first time is obtained based on the sum of the second time and the third time.
- the terminal device receives the first time sent by the access network device, including:
- the terminal device receives the second time and the third time sent by the access network device by means of broadcast or unicast.
- the method before the receiving, by the terminal device, the first time sent by the access network device, the method further includes:
- the terminal device sends a first message to the access network device, where the first message is used to request synchronization of a clock of the terminal device;
- the first message includes at least one of: requesting a message at a first time, requesting a message at a third time;
- the first message includes at least one of the following: accuracy information of a time that the terminal device needs to acquire, and a time type requested by the terminal device.
- the first message is one of the following: an RRC message, a medium access control control element MAC CE message, a random access request message for time synchronization.
- the terminal device acquires the fourth time according to the first transmission delay and the first time, and includes:
- the terminal device obtains the fourth time according to the sum of the first time and the first transmission delay.
- the terminal device acquires the first transmission delay, including:
- the terminal device acquires uplink timing advance information, and acquires the first transmission delay according to the uplink timing advance information.
- the acquiring, by the terminal device, the uplink timing advance information includes:
- the terminal device receives the access network device to send the second message, where the second message includes the uplink timing advance adjustment information, and the terminal device updates the terminal device according to the previous uplink timing advance information and the uplink timing advance adjustment information. Current uplink timing advance information.
- the first time or the fourth time represents the time of a particular frame, subframe, slot, mini slot, or boundary of a symbol.
- the embodiment of the present application further provides a time synchronization method, where the method includes:
- the access network device determines the first time
- the access network device sends a first time to the terminal device, where the first time is used to synchronize the clock of the terminal device.
- the first time includes a second time and a third time
- the second time is a millisecond time
- the third time is a microsecond time and/or a nanosecond time.
- the first time is obtained based on the sum of the second time and the third time.
- the access network device sends the first time to the terminal device, including:
- the access network device sends the second time and the third time to the terminal device by means of broadcast or unicast.
- the method before the sending network device sends the first time to the terminal device, the method further includes:
- the first message includes at least one of: requesting a message at a first time, requesting a message at a third time;
- the first message includes at least one of the following: accuracy information of a time that the terminal device needs to acquire, and a time type requested by the terminal device.
- the first message is one of the following: an RRC message, a medium access control control element MAC CE message, a random access request message for time synchronization.
- the first time represents the time of a particular frame, subframe, slot, mini slot, or symbol boundary.
- the embodiment of the present application further provides a terminal device, where the terminal device includes:
- a transceiver module configured to receive a first time sent by the access network device
- a processing module configured to acquire a first transmission delay, and acquire a fourth time according to the first transmission delay and the first time; and synchronize a clock of the terminal device according to the fourth time.
- the first time includes a second time and a third time
- the second time is a millisecond time
- the third time is a microsecond time and/or a nanosecond time.
- the first time is obtained based on the sum of the second time and the third time.
- the terminal device receives the first time sent by the access network device, including:
- the terminal device receives the second time and the third time sent by the access network device by means of broadcast or unicast.
- the transceiver module before receiving the first time sent by the access network device, is further configured to:
- the first message includes at least one of: requesting a message at a first time, requesting a message at a third time;
- the first message includes at least one of the following: accuracy information of a time that the terminal device needs to acquire, and a time type requested by the terminal device.
- the first message is one of the following: an RRC message, a medium access control control element MAC CE message, a random access request message for time synchronization.
- the processing module is specifically configured to:
- the processing module is specifically configured to:
- the receiving module is further configured to receive a first message sent by the access network device, where the first message includes the uplink timing advance information;
- the receiving module is further configured to: receive, by the access network device, a second message, where the second message includes uplink timing advance adjustment information, where the processing module is specifically configured to: according to previous uplink timing advance information and the uplink timing The advance adjustment information is used to update the current uplink timing advance information of the terminal device.
- the first time or the fourth time represents the time of a particular frame, subframe, slot, mini slot, or boundary of a symbol.
- the embodiment of the present application further provides an access network device, where the access network device includes:
- a processing module configured to determine a first time
- a transceiver module configured to send, to the terminal device, a first time, where the first time is used to synchronize a clock of the terminal device.
- the first time includes a second time and a third time
- the second time is a millisecond time
- the third time is a microsecond time and/or a nanosecond time.
- the first time is obtained based on the sum of the second time and the third time.
- the access network device sends the first time to the terminal device, including:
- the access network device sends the second time and the third time to the terminal device by means of broadcast or unicast.
- the method before the sending network device sends the first time to the terminal device, the method further includes:
- the first message includes at least one of: requesting a message at a first time, requesting a message at a third time;
- the first message includes at least one of the following: accuracy information of a time that the terminal device needs to acquire, and a time type requested by the terminal device.
- the first message is one of the following: an RRC message, a medium access control control element MAC CE message, a random access request message for time synchronization.
- the first time represents the time of a particular frame, subframe, slot, mini slot, or symbol boundary.
- the embodiment of the present application provides a communication device, which may be a terminal device, and the communication device has a function of implementing the foregoing first or third aspect of the method;
- the communication device includes: a communication module, a processor ;
- the communication module is configured to perform communication interaction with other devices, and the communication module may be an RF circuit, a WiFi module, a communication interface, a Bluetooth module, or the like.
- the processor is configured to implement the functions of the processing module in the fifth aspect or the seventh aspect.
- the communication device may further include: a memory for storing a program or the like.
- the program can include program code, the program code including instructions.
- the memory may include random access memory (RAM), and may also include non-volatile memory, such as at least one disk storage.
- the processor executes the application stored in the memory to implement the above functions.
- the communication module, the processor, and the memory can be interconnected by a bus;
- the bus can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA). Bus, etc.
- PCI peripheral component interconnect
- EISA extended industry standard architecture
- the bus can be divided into an address bus, a data bus, a control bus, and the like.
- the embodiment of the present application provides a communication apparatus, where the communication apparatus may be an access network device, and the communication apparatus has a function of implementing the foregoing second or fourth aspect of the method; the communication apparatus includes: a communication module, processor;
- the communication module is configured to perform communication interaction with other devices, and the communication module may be an RF circuit, a WiFi module, a communication interface, a Bluetooth module, or the like.
- the processor is configured to implement the functions of the processing module in the sixth aspect or the eighth aspect.
- the communication device may further include: a memory for storing a program or the like.
- the program can include program code, the program code including instructions.
- the memory may contain RAM and may also include non-volatile memory, such as at least one disk storage.
- the processor executes the application stored in the memory to implement the above functions.
- the communication module, the processor and the memory can be connected to each other through a bus;
- the bus can be a PCI bus or an EISA bus or the like.
- the bus can be divided into an address bus, a data bus, a control bus, and the like.
- an embodiment of the present application provides a time synchronization method, where the method includes:
- the terminal device obtains the first time according to the first value, where the time unit of the first time is n microseconds or n nanoseconds or n femtoseconds or n milliseconds, n is greater than 0; when the time unit is n In milliseconds, n is less than 10.
- the terminal device obtains the first time according to the first value, including:
- first indication information that is sent by the access network device by using a system message or a unicast message or a multicast message, where the first indication information is used to indicate a time unit of the first time;
- the terminal device obtains the first time according to a product of the first value and a time unit of the first time.
- the time unit of the first time is a preset time unit
- the terminal device obtains the first time according to a product of the first value and the preset time unit.
- the method further includes:
- the terminal device receives the second time sent by the access network device by means of broadcast or unicast or multicast, and the time unit of the second time is 10 milliseconds;
- the terminal device adds the first time to the second time to obtain a third time.
- the method further includes:
- the terminal device obtains a fifth time according to the sum of the first time and the preset time, and synchronizes the time of the terminal device according to the fifth time.
- the terminal device receives the first value sent by the access network device, including:
- the terminal device receives a unicast message sent by the access network device, where the unicast message includes the first value.
- the unicast message further includes a first system frame number
- the terminal device After receiving the unicast message sent by the access network device, the terminal device further includes
- the terminal device obtains a first system frame corresponding to the fifth time according to the frame number of the first system frame and the frame number of the second system frame; and the second system frame is a system frame of the first value.
- the fifth time corresponds to a frame header boundary or a frame tail boundary of the first system frame
- the first system frame is a system frame that is closest to the second system frame and has a frame number equal to a frame number of the first system frame;
- the first system frame is a system frame that is in front of the second system frame and is closest to the second system frame and has a frame number equal to a frame number of the first system frame;
- the first system frame is a system frame that is closest to the second system frame after the second system frame and has a frame number equal to a frame number of the first system frame;
- the first system frame is the second system frame.
- the terminal device receives the first value sent by the access network device, including:
- the terminal device receives a first system message block sent by the network device, where the first system message block includes the first value.
- the first value includes values of a plurality of parameters, the plurality of parameters corresponding to different time units;
- the terminal device obtains the first time according to values of a plurality of parameters included in the first value.
- it also includes:
- the terminal device sends a first message to the access network device, where the first message is used to request the access network device to send a first value to the terminal device.
- the embodiment of the present application provides a time synchronization method, where the method includes:
- the access network device determines a first value, where the first value is used to indicate a first time, the time unit of the first time is n microseconds or n nanoseconds or n femtoseconds or n milliseconds, n is greater than 0; When the time unit is n milliseconds, n is less than 10;
- the access network device sends the first value to the terminal device.
- the method further includes:
- the access network device sends the first indication information to the terminal device by using a system message or a unicast message or a multicast message, where the first indication information is used to indicate a time unit of the first time;
- the first time is obtained by the terminal device according to a product of the first value and a time unit of the first time.
- the time unit of the first time is a preset time unit, and the first time is obtained by the terminal device according to a product of the first value and the preset time unit.
- the access network device sends a second time to the terminal device by means of broadcast or unicast or multicast, and the time unit of the second time is 10 milliseconds;
- the third time is obtained by the terminal device adding the first time and the second time.
- the access network device sends the first value to the terminal device, including:
- the access network device sends a unicast message to the terminal device, where the unicast message includes the first value.
- the unicast message further includes a first system frame number
- the first system frame corresponding to the fifth time is obtained by the terminal device according to the frame number of the first system frame and the frame number of the second system frame; the second system frame is that the terminal device receives the The system frame of the first value.
- the fifth time corresponds to a frame header boundary or a frame tail boundary of the first system frame
- the first system frame is a system frame that is closest to the second system frame and has a frame number equal to a frame number of the first system frame;
- the first system frame is a system frame that is in front of the second system frame and is closest to the second system frame and has a frame number equal to a frame number of the first system frame;
- the first system frame is a system frame that is closest to the second system frame after the second system frame and has a frame number equal to a frame number of the first system frame;
- the first system frame is the second system frame.
- the access network device sends the first value to the terminal device, including:
- the access network device sends a first system message block to the terminal device, where the first system message block includes the first value.
- the first value includes a value of a plurality of parameters, and the plurality of parameters correspond to different time units; the first time is that the terminal device obtains according to values of the plurality of parameters of.
- it also includes:
- the access network device receives a first message sent by the terminal device, where the first message is used to request the access network device to send a first value to the terminal device.
- the embodiment of the present application provides a terminal device, where the terminal device has the function of implementing the terminal device in the foregoing eleventh aspect, and the terminal device includes one or more modules corresponding to the foregoing functions.
- the terminal device includes: a processing module, a transceiver module;
- the transceiver module is configured to: receive a first value sent by the access network device, where the first value is used to indicate the first time;
- the processing module is configured to: obtain the first time according to the first value, where the time unit of the first time is n microseconds or n nanoseconds or n femtoseconds or n milliseconds, n is greater than 0; When the unit is n milliseconds, n is less than 10.
- the transceiver module is further configured to: receive first indication information that is sent by the access network device by using a system message or a unicast message or a multicast message, where the first indication information is used to indicate the The time unit of the first time;
- the processing module is specifically configured to: obtain the first time according to a product of the first value and a time unit of the first time.
- the time unit of the first time is a preset time unit
- the processing module is specifically configured to: obtain, by the terminal device, the first time according to a product of the first value and the preset time unit.
- the transceiver module is further configured to: receive, by broadcast or unicast or multicast, a second time sent by the access network device, where the time unit of the second time is 10 milliseconds ;
- the processing module is specifically configured to: add the first time to the second time to obtain a third time.
- the processing module is further configured to: obtain a fifth time according to the sum of the first time and the preset time, and synchronize the time of the terminal device according to the fifth time.
- the transceiver module is specifically configured to: receive a unicast message sent by the access network device, where the unicast message includes the first value.
- the unicast message further includes a first system frame number
- the processing module is further configured to: obtain a first system frame corresponding to the fifth time according to the frame number of the first system frame and the frame number of the second system frame; and the second system frame is the first value System frame.
- the fifth time corresponds to a frame header boundary or a frame tail boundary of the first system frame
- the first system frame is a system frame that is closest to the second system frame and has a frame number equal to a frame number of the first system frame;
- the first system frame is a system frame that is in front of the second system frame and is closest to the second system frame and has a frame number equal to a frame number of the first system frame;
- the first system frame is a system frame that is closest to the second system frame after the second system frame and has a frame number equal to a frame number of the first system frame;
- the first system frame is the second system frame.
- the transceiver module is specifically configured to: receive a first system message block sent by the network device, where the first system message block includes the first value.
- the first value includes values of a plurality of parameters, the plurality of parameters corresponding to different time units;
- the processing module is specifically configured to: obtain the first time according to values of the plurality of parameters included in the first value.
- the transceiver module is further configured to: send a first message to the access network device, where the first message is used to request the access network device to send the first message to the terminal device Value.
- the embodiment of the present application provides an access network device, where the access network device has the function of implementing the access network device in the foregoing twelfth aspect, where the access network device includes one or more functions Corresponding modules.
- the access network device includes: a processing module, a transceiver module.
- the processing module is configured to: determine a first value, where the first value is used to indicate a first time, and the time unit of the first time is n microseconds or n nanoseconds or n femtoseconds or n milliseconds, where n is greater than 0; when the time unit is n milliseconds, n is less than 10;
- the transceiver module is configured to: send the first value to the terminal device.
- the transceiver module is further configured to send the first indication information to the terminal device by using a system message or a unicast message or a multicast message, where the first indication information is used to indicate the first time Time unit
- the first time is obtained by the terminal device according to a product of the first value and a time unit of the first time.
- the time unit of the first time is a preset time unit, and the first time is obtained by the terminal device according to a product of the first value and the preset time unit.
- the transceiver unit is further configured to: send a second time to the terminal device by means of broadcast or unicast or multicast, where the time unit of the second time is 10 milliseconds;
- the third time is obtained by the terminal device adding the first time and the second time.
- the transceiver module is specifically configured to: send a unicast message to the terminal device, where the unicast message includes the first value.
- the unicast message further includes a first system frame number
- the first system frame corresponding to the fifth time is obtained by the terminal device according to the frame number of the first system frame and the frame number of the second system frame; the second system frame is that the terminal device receives the The system frame of the first value.
- the fifth time corresponds to a frame header boundary or a frame tail boundary of the first system frame
- the first system frame is a system frame that is closest to the second system frame and has a frame number equal to a frame number of the first system frame;
- the first system frame is a system frame that is in front of the second system frame and is closest to the second system frame and has a frame number equal to a frame number of the first system frame;
- the first system frame is a system frame that is closest to the second system frame after the second system frame and has a frame number equal to a frame number of the first system frame;
- the first system frame is the second system frame.
- the transceiver module is specifically configured to: send a first system message block to the terminal device, where the first system message block includes the first value.
- the first value includes a value of a plurality of parameters, and the plurality of parameters correspond to different time units; the first time is that the terminal device obtains according to values of the plurality of parameters of.
- the transceiver module is further configured to: receive a first message sent by the terminal device, where the first message is used to request the access network device to send a first value to the terminal device .
- the embodiment of the present application provides a communication device, where the communication device may be a terminal device, and the communication device has a function of implementing the foregoing method of the eleventh aspect;
- the communication device includes: a communication module, a processor;
- the communication module is configured to perform communication interaction with other devices, and the communication module may be an RF circuit, a WiFi module, a communication interface, a Bluetooth module, or the like.
- the processor is configured to implement the functions of the processing module in the thirteenth aspect.
- the communication device may further include: a memory for storing a program or the like.
- the program can include program code, the program code including instructions.
- the memory may include random access memory (RAM), and may also include non-volatile memory, such as at least one disk storage.
- the processor executes the application stored in the memory to implement the above functions.
- the communication module, the processor, and the memory can be interconnected by a bus;
- the bus can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA). Bus, etc.
- PCI peripheral component interconnect
- EISA extended industry standard architecture
- the bus can be divided into an address bus, a data bus, a control bus, and the like.
- the embodiment of the present application provides a communication apparatus, where the communication apparatus may be an access network device, and the communication apparatus has a function of implementing the method of the foregoing twelfth aspect;
- the communication apparatus includes: a communication module, and a processor ;
- the communication module is configured to perform communication interaction with other devices, and the communication module may be an RF circuit, a WiFi module, a communication interface, a Bluetooth module, or the like.
- the processor is configured to implement the functions of the processing module in the fourteenth aspect.
- the communication device may further include: a memory for storing a program or the like.
- the program can include program code, the program code including instructions.
- the memory may contain RAM and may also include non-volatile memory, such as at least one disk storage.
- the processor executes the application stored in the memory to implement the above functions.
- the communication module, the processor and the memory can be connected to each other through a bus;
- the bus can be a PCI bus or an EISA bus or the like.
- the bus can be divided into an address bus, a data bus, a control bus, and the like.
- the embodiment of the present application further provides a computer readable storage medium storing instructions for causing a computer to implement a time synchronization method provided by any one of the above designs when the instructions are run on a computer.
- the embodiment of the present application further provides a computer program product comprising instructions, when executed on a computer, causing the computer to execute the time synchronization method provided by any one of the above designs.
- the embodiment of the present application further provides a computer program that, when run on a computer, causes the computer to execute the time synchronization method provided by any of the above designs.
- the embodiment of the present application further provides a chip connected to a memory for reading and executing a software program stored in the memory to implement a time synchronization method provided by any of the above designs.
- FIG. 1 is a schematic structural diagram of a system applicable to an embodiment of the present application.
- FIG. 2 is a schematic flowchart of a time synchronization method provided in Embodiment 1 of the present application;
- FIG. 3 is a schematic flowchart of a time synchronization method provided in Embodiment 2 of the present application.
- FIG. 4 is a schematic flowchart of a time synchronization method provided in Embodiment 3 of the present application.
- FIG. 5 is a schematic flowchart of a time synchronization method provided in Embodiment 4 of the present application.
- FIG. 6 is a schematic flowchart of a time synchronization method provided in Embodiment 5 of the present application.
- FIG. 7 is a schematic structural diagram of a communication apparatus according to an embodiment of the present application.
- FIG. 8 is a schematic structural diagram of still another communication apparatus according to an embodiment of the present application.
- FIG. 9 is a schematic structural diagram of still another communication apparatus according to an embodiment of the present application.
- FIG. 10 is a schematic structural diagram of still another communication apparatus according to an embodiment of the present application.
- FIG. 11 is a schematic flowchart of a time synchronization method according to Embodiment 1 of the present application.
- Figure 11b is a schematic diagram of a process of determining a time information reference point
- Figure 11c is a schematic diagram of time information without carrying the year, month, and day;
- FIG. 12 is a schematic flowchart of a time synchronization method according to Embodiment 2 of the present application.
- Figure 12b is a schematic diagram of the expanded SIB16
- Figure 12c is a schematic diagram showing the time unit of the first time as a time unit of some inherent length
- Figure 12d is a first numerical diagram of an explicit mode indication
- Figure 12e is a first numerical diagram of another explicit mode indication
- FIG. 13 is a schematic flowchart of a time synchronization method according to Embodiment 4 of the present application.
- FIG. 14 is a schematic flowchart of a time synchronization method according to Embodiment 4 of the present application.
- FIG. 15 is a schematic structural diagram of a terminal device according to an embodiment of the present disclosure.
- FIG. 16 is a schematic structural diagram of an access network device according to an embodiment of the present disclosure.
- FIG. 17 is a schematic structural diagram of a communication apparatus according to an embodiment of the present application.
- FIG. 1 is a schematic structural diagram of a system applicable to an embodiment of the present application.
- the system architecture includes an access network device 101, a core network device 103, and one or more terminal devices, such as the terminal device 1021, the terminal device 1022, and the terminal device 1023 shown in FIG. 1.
- Information transmission between the access network device 101 and the core network device 103 can be performed; the access network device 101 can transmit downlink data to the terminal device 1021, the terminal device 1022, and the terminal device 1023 through the network, the terminal device 1021, the terminal device 1022, and the terminal.
- the device 1023 can transmit uplink data to the access network device 101 over the network.
- the access network device may be a base station (BS).
- BS base station
- a base station device also referred to as a base station, is a device deployed in a wireless access network to provide wireless communication functionality.
- a device providing a base station function in a 2G network includes a base transceiver station (BTS) and a base station controller (BSC), and the device providing the base station function in the 3G network includes a Node B (NodeB) and the wireless device.
- BTS base transceiver station
- BSC base station controller
- NodeB Node B
- a radio network controller which provides a base station function in a 4G network, includes an evolved NodeB (eNB), and a device that provides a base station function in a 5G network, including a new radio Node B (new radio NodeB) , gNB), centralized unit (CU), distributed unit and new wireless controller.
- eNB evolved NodeB
- gNB new radio Node B
- CU centralized unit
- new wireless controller new wireless controller
- the core network device 103 may be a mobility management entity (MME) in an LTE system, or an access and mobility management function (AMF) network element and session management function in a 5G communication system.
- MME mobility management entity
- AMF access and mobility management function
- SMF session management function
- a terminal device is a device with wireless transceiver capability that can be deployed on land, indoors or outdoors, handheld or on-board; it can also be deployed on the water (such as ships); it can also be deployed in the air (such as airplanes, balloons, and Satellite, etc.).
- the terminal device may be a mobile phone, a tablet, a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, and industrial control ( Wireless terminal equipment in industrial control, wireless terminal equipment in self driving, wireless terminal equipment in remote medical, wireless terminal equipment in smart grid, transportation security Wireless terminal equipment in safety), wireless terminal equipment in smart city, wireless terminal equipment in smart home, and the like.
- FIG. 1 the system architecture illustrated in FIG. 1 is mainly taken as an example, but is not limited thereto.
- the communication system applicable to the above system architecture includes but is not limited to: time division duplexing-long term evolution (TDD LTE), frequency division duplexing-long term evolution (FDD LTE) Long term evolution-advanced (LTE-A), and various wireless communication systems (eg, 5G NR systems) that are evolving in the future.
- TDD LTE time division duplexing-long term evolution
- FDD LTE frequency division duplexing-long term evolution
- LTE-A Long term evolution-advanced
- various wireless communication systems eg, 5G NR systems
- the access network device broadcasts time information through a system information block (SIB), where the time information includes information such as coordinated universal time (UTC), and the terminal device calculates global information according to the acquired time information.
- SIB system information block
- the time information includes information such as coordinated universal time (UTC)
- UTC coordinated universal time
- GPS Global positioning system
- time synchronization is not accurate enough.
- the embodiment of the present application provides a time synchronization method, including: receiving, by a terminal device, a first indication message sent by an access network device, where the first indication message includes time information, and acquiring a first transmission delay, according to the first transmission
- the time delay and the time information are obtained for the fourth time, and the clock of the terminal device is synchronized according to the fourth time; thus, when the terminal device synchronizes the clock of the terminal device, the first transmission delay is introduced, so that the air interface can be effectively avoided.
- the time error of transmission improves the accuracy of time synchronization; and the time synchronization method has strong applicability and can be applied to terminal devices in different states, such as idle state, connected state, and deactivated state.
- time synchronization in the embodiment of the present application may also be referred to as clock synchronization.
- FIG. 2 is a schematic flowchart of a time synchronization method according to Embodiment 1 of the present application. As shown in Figure 2, it includes:
- Step 201 The access network device determines time information.
- the time information may include a time of the first time type, such as XX minutes XX minutes XX milliseconds XX microseconds, or XX minutes XX minutes XX milliseconds XX microseconds XX nanoseconds, wherein the first time type may correspond to UTC.
- the first time type may correspond to UTC.
- the time information may further include a time difference of the first time type and other time types (GPS time or local time), such as a time difference of UTC and GPS time, a time difference of UTC and local time.
- GPS time or local time such as a time difference of UTC and GPS time, a time difference of UTC and local time.
- the time unit used by the time information may be any time unit with an accuracy higher than or equal to milliseconds (ms), such as microseconds (us), nanoseconds (ns), and higher possible future occurrences.
- ms milliseconds
- ns nanoseconds
- the granularity of the time information can be greater than or equal to 1 Any value, such as the granularity of the time information is 50, the granularity of the time information is 50 ns, and the granularity of the time information is 100, and the granularity of the time information is 100 ns; for another example, the time information is used.
- the granularity of the time information may be any value greater than or equal to 1, for example, the granularity of the time information is 1, and the granularity of the time information is 1 us, and the granularity of the time information is 10, for example.
- the time information has a granularity of 10us.
- the granularity of the time information may be 1 us or 10 us or 50 ns or 100 ns or 1 ms, which is merely an exemplary enumeration based on the above description, and is not limited thereto, and all other values and time units that meet the above description constitute time.
- the granularity of the information is within the scope of the present application.
- Step 202 The access network device sends a first indication message to the terminal device, where the first indication message includes time information, where the time information is used to synchronize the clock of the terminal device.
- the first indication message may further include at least one of the following: a time information reference point, and a time type.
- the time type corresponds to at least one of UTC, GPS time, and local time, and is used to indicate the time type of the time information.
- the time information reference point is used to indicate that the time domain location time information reference point corresponding to the first time or the fourth time received by the terminal device may be the start of a scheduling unit such as a frame, a subframe, a time slot, a mini time slot, a symbol, and the like.
- the ending boundary corresponds to which frame, which subframe, which time slot, which mini time slot, and which symbol the terminal device needs to synchronize the time of the terminal device.
- the time information reference point may be a specific frame number or a subframe number or a specific time slot of a certain subframe or a boundary of a specific first symbol in a certain subframe (the boundary includes an initial And the last two cases); or a specific frame number or subframe number closest to the time when the message was received or a specific time slot or a specific number of a certain subframe in a certain subframe
- the boundary of the symbol (the boundary includes both the start and end).
- the time information reference point may also correspond to the frame end boundary or the frame start boundary of the frame where the system message window of the system message is located;
- the time information reference point corresponds to a frame end boundary or a frame start boundary of the frame where the downlink unicast message is successfully received;
- the time information reference point corresponds to the frame end boundary or the frame start boundary of the frame where the uplink request message corresponding to the downlink unicast message is successfully received;
- the time information reference point corresponds to a frame end boundary or a frame start boundary of the frame where the downlink unicast message is initially transmitted;
- the time information reference point corresponds to the frame end boundary or the frame start boundary of the frame where the uplink request message corresponding to the downlink unicast message is originally transmitted;
- the time information reference point corresponds to the frame end boundary or the frame start boundary of the frame where the downlink unicast message is retransmitted n, and n is a positive integer.
- the time information reference point corresponds to the frame end boundary or the frame start boundary of the frame where the nth retransmission of the uplink request message corresponding to the downlink unicast message is located, where n is A positive integer.
- the granularity of the time information reference point may be the same as or different from the granularity of the time information.
- the granularity of the time information reference point may be greater than the granularity of the time information.
- the time information reference point granularity is the subframe granularity, and the granularity may be the millisecond level, and the time information granularity may be the microsecond level.
- the time information reference point may be pre-defined by the protocol. In this case, the time information reference point may no longer be carried in the first indication message. Alternatively, the time information reference point may also be dynamic and may be determined by the access network device. In this case, the first indication message may carry a time information reference point, so as to notify the terminal device at which point in time to synchronize the The clock of the terminal device. In other possible implementation manners, the access network device may also send the time information reference point by using a message other than the first indication message, that is, the first indication message does not carry the time information reference point, but is carried by other messages.
- the access network device when determining the time information reference point, may use the time when the time information is carried as a reference point or the time of a previous message as a reference point.
- the trigger condition for the access network device to send the time information to the terminal device by using the first indication message may be multiple.
- the access network device may determine the time information according to the request message sent by the terminal device and send the time information to the terminal device, that is, triggered by the request message. In this case, time synchronization may be performed on demand to avoid wasting resources; or, It is triggered by other conditions.
- the access network device determines the time information according to the set period and sends the time information to the terminal device, that is, periodically triggers, which is not limited.
- the access network device determines the time information.
- the time information There are various ways for the access network device to determine the time information. Several possible implementations are specifically described below.
- the access network device receives the request message sent by the terminal device, where the request message may include at least one of: requirement information of time information, granularity requirement information of time information, and quality of service (QoS) of the terminal device supporting the service. Information, the type of time the terminal device requested. Further, the access network device determines time information according to the request message.
- the request message may include at least one of: requirement information of time information, granularity requirement information of time information, and quality of service (QoS) of the terminal device supporting the service.
- QoS quality of service
- the requirement information of the time information is used to indicate that the terminal device needs to obtain the time information, or is used to indicate that the access network device needs to send time information to the terminal device, which may be specifically
- the content of the form is not limited in this application.
- the granularity requirement information of the time information is used to indicate the granularity of the time information required by the terminal device, for example, may be 1 us or 100 ns or 1 ms. After the access network device obtains the granularity requirement information of the time information, Based on this, the granularity of the time information can be determined.
- the QoS information of the terminal device support service is used to indicate the granularity of the time information required by the terminal device.
- the QoS information may directly include the granularity requirement information required by the service, for example, may be 1 us or 100 ns. Or 1 ms, after the access network device obtains the QoS information of the terminal device support service, the granularity of the time information can be determined based on the QoS information of the terminal device support service.
- the QoS information may not directly include the granularity requirement information required by the service.
- the access network device may infer the granularity requirement information required by the service based on the received QoS information, and according to The inferred granularity requirement information determines the granularity of the time information.
- the time type requested by the terminal device corresponds to at least one of UTC, GPS time, and local time.
- the time information can be determined based on the time information.
- the time type requested by the terminal device corresponds to the UTC and the GPS time, and the access network device can determine the time including the UTC in the time information, and the time difference between the UTC and the GPS time; for example, 2, the time requested by the terminal device.
- the type corresponds to UTC and local time, and the access network device can determine that the time information includes UTC time, and the time difference between UTC and local time.
- the above three time types are only UTC, GPS time, and local time. In other embodiments, other time types other than the above three types may exist.
- the terminal device requests The time type may also correspond to other time types, which is not limited in this application.
- different information element (IE) combinations correspond to different time types, for example, IE0 corresponds to UTC, IE0 and IE1 correspond to GPS time, and IE0 and IE2 correspond to local time.
- the time type requested by the terminal device may be specifically an identifier of the IE combination, and the access network device may determine the time type corresponding to the identifier of the IE combination according to the identifier of the IE combination, and further obtain the request of the terminal device. Time type.
- the request message may be a radio resource control (RRC) message or a media access control element (MAC CE) message or a random access request message.
- RRC radio resource control
- MAC CE media access control element
- the RRC message may include an RRC connection release message or the like, which is not limited.
- the access network device may obtain the first indication information from the core network device, where the first indication information includes the granularity requirement information of the time information and/or the QoS information of the terminal device supporting service. Further, the access network device determines time information according to the first indication information.
- the granularity requirement information of the time information and the QoS information of the terminal device supporting service can be referred to the description in the foregoing mode 1, and details are not described herein again.
- the content of the time information may also be previously agreed by the protocol, or may be determined in advance by the access network device and the terminal device.
- the granularity of the pre-agreed time information is 1 us or 100 ns or 1 ms, and /
- the time type of the pre-agreed time information includes UTC, GPS time, and local time, that is, time in the time information including UTC, time difference of UTC and GPS time, time difference of UTC and local time.
- the possible ways of determining the time information are: (1) determining time information according to the request message, (2) determining time information according to the first indication information, and (3) determining time information according to a predetermined agreement.
- the three methods may be used independently or in combination with each other.
- the access network device may determine the time type of the time information according to the time type requested by the terminal device, and determine the granularity of the time information according to the first indication information, or may determine the granularity of the time information according to the pre-agreed granularity.
- the request message includes only the requirement information of the time information
- the access network device may determine the time type of the time information according to the pre-agreed time type, and determine the granularity of the time information according to the first indication information, or The granularity of the time information can be determined according to a pre-agreed granularity.
- the access network device may determine the granularity and time type of the time information based only on the related content of the pre-agreed time information, or The granularity of the time information may also be determined according to the first indication information, and the time type of the time information is determined according to the related content of the pre-agreed time information.
- Table 1 An example of the content included in the first indication message
- the access network device may send the first indication message to the terminal device in a broadcast or unicast or multicast manner, which is not limited.
- the terminal device can receive the first indication message sent by the access network device by means of broadcast or unicast or multicast.
- the first indication message may be a system message, an RRC message, or a MAC CE message.
- the access network device may further receive the authorization information sent by the core network device, where the authorization information is used to indicate whether the terminal device can obtain the time information. If the authorization information indicates that the terminal device can obtain the time information, the access network device sends the first indication message to the terminal device; if the authorization information indicates that the terminal device cannot obtain the time information, The time information may be that the access network device may not send the first indication message to the terminal device.
- the core network device may authorize the terminal device to use the precise timing service, and send the authorization information to the access network device, so that the access network device may send the first to the terminal device.
- An indication message If the terminal device is not authorized, the access network device may not send the first indication message, or may not respond to the request message sent by the terminal device.
- Step 203 The terminal device receives the first indication message sent by the access network device.
- Step 204 The terminal device acquires a first transmission delay, and acquires a fourth time according to the first transmission delay and the time information.
- the first transmission delay may be a downlink one-way transmission delay; or the first transmission delay may be a comprehensive consideration of the downlink one-way transmission delay and processing of the terminal device and/or the access network device. Obtained by time delay.
- the processing delay of the terminal device and the access network device may be pre-agreed by the protocol, or may be determined by the access network device and sent to the terminal device, which is not limited.
- the manner in which the terminal device obtains the downlink one-way transmission delay may be multiple.
- the terminal device acquires the uplink timing advance (TA) information, and acquires the downlink one-way transmission delay according to the uplink timing advance information.
- TA uplink timing advance
- a possible implementation manner is that the terminal device receives the second indication message sent by the access network device, where the second indication message includes the uplink timing advance information.
- the terminal device receives a random access response (RAR) sent by the access network device (that is, a second indication message), and the random access response includes uplink timing advance information;
- RAR random access response
- the terminal device triggers the random access, the physical resource (the physical random access channel (PRACH)) and the preamble (preamble) for transmitting the preamble are selected, and then the preamble is sent on the PRACH.
- PRACH physical random access channel
- the access network device After receiving the random access request, the access network device allocates the corresponding RAR and carries the uplink timing advance information in the RAR.
- the terminal device may periodically trigger the random access to obtain the uplink timing advance information, or may maintain the validity of the downlink one-way transmission delay by using a timer. If the timer expires, the terminal device re-initiates the randomization.
- the access is used to obtain the uplink timing advance information, or the uplink timing advance information is obtained by triggering the random access by using other specific events or commands, which is not limited.
- the physical resource used for transmitting the preamble may be the PRACH involved in the foregoing description, or may be other names, such as NR-PRACH in the 5G communication system.
- the terminal device may carry an indication information in the random access request, and is used to indicate that the terminal device has completed the process of the random access after the RAR is sent. That is to say, the random access request is a random access request for the timing purpose, or the terminal device does not continue to initiate the subsequent RRC procedure.
- the access network device can distinguish the random access request from the traditional random access request, and perform corresponding operations, such as releasing resources allocated for the random access procedure, such as temporary wireless.
- a radio network temporary identifier (RNTI), or an access network device does not need to wait for subsequent messages.
- RNTI radio network temporary identifier
- the terminal device receives the third indication message sent by the access network device, where the third indication message includes uplink timing advance adjustment information, and the terminal device according to the previous uplink timing advance information and the The uplink timing advance adjustment information obtains the uplink timing advance information.
- the terminal device may obtain the uplink timing advance information of the terminal device according to the received TA adjustment command (that is, the third indication message) sent by the access network device, that is, the terminal device adjusts according to the TA.
- the uplink timing advance adjustment information in the command is used to update the previous uplink timing advance information to obtain the current uplink timing advance of the terminal device, as shown in the following formula:
- N TA new is the current uplink timing advance of the terminal device
- N TA old is the previous uplink timing advance
- T is obtained according to the uplink timing advance adjustment information, which may be a functional formula about N TA, old .
- the current uplink timing advance information of the terminal device can be obtained by using the following formula:
- N TA,new N TA,old +(N TA,old -31)*16...Form 2
- (N TA, old -31) * 16 is obtained based on the uplink timing advance adjustment information in the TA adjustment command.
- the terminal device may obtain uplink timing advance information according to the last TA of the saved connection state, or may be connected according to the release of the RRC connection.
- the access device allocates one TA to the terminal device to obtain uplink timing advance information.
- the deactivated state may be referred to as an inactive state, between the idle state and the connected state.
- the access network device maintains a connection with the core network, that is, saves the context of the terminal device, but releases The connection between the access network device and the terminal device eliminates the delay in which the terminal device needs to reacquire the context of the terminal device when it enters the connected state.
- a possible implementation manner is that the terminal device uses half of the TA in the uplink timing advance information as the downlink one-way transmission delay, or may also It is based on the TA in the uplink timing advance information, and uses other functions to obtain the downlink one-way transmission delay, which is not limited.
- Step 205 The terminal device synchronizes the clock of the terminal device according to the fourth time.
- step numbers are only an exemplary representation of the execution process, and do not constitute a specific limitation on the execution order.
- the fourth time is obtained according to the first transmission delay and the time information, and the specific manner may be multiple.
- the time information includes the UTC time
- the terminal The device can sum the first transmission delay and the UTC time to obtain a fourth time (T1), and then update the UTC time of the terminal device to the fourth time, thereby implementing time synchronization.
- the terminal device may further calculate the GPS time and the local time.
- One possible implementation manner is: obtaining the GPS by the following formula: Time, local time:
- T3 is the local time of the day
- T4 is the UTC time UTC time
- t2 is the local time offset localTimeOffset
- t3 is the first transmission delay, such as TA value/2 or (TA value+TA adjustment) /2; It can be understood that a case of the above formula is Local time of the day is calculated as UTC time+localTimeOffset(Field value*15min)+TA value/2
- T5 is GPS time GPS Time
- T4 is UTC time timeInfoUTC
- t4 is a time adjustment amount, such as value -2,524,953,600 (seconds), can also be other values, this case is not limited
- t5 is the time difference between UTC and GPS time leapSeconds
- the terminal device synchronizes the clock of the terminal device according to the first transmission delay and the time information.
- the terminal device may directly And synchronizing the clock of the terminal device according to the time information in the first indication message.
- the terminal device performs time synchronization according to the first transmission delay and time information; and mode 2, the terminal device performs time synchronization according to the time information.
- the terminal device may be configured to perform time synchronization by using a protocol in advance, or the access network device may send the synchronization indication information to the terminal device to indicate that the terminal device uses mode 1 or mode 2 to perform time. Synchronization, further, the synchronization indication information may be sent by using a system message or an RRC message or a MAC CE, which is not limited.
- FIG. 3 is a schematic flowchart of a time synchronization method according to Embodiment 2 of the present application. As shown in FIG. 3, the method includes:
- Step 301a The access network device sends a first request message to the core network device, where the core network device is requested to send the first indication information.
- Step 301b The core network device receives the first request message, and sends the first indication information to the access network device.
- the first indication information includes granularity requirement information of the time information and/or QoS information of the terminal device supporting service.
- Step 302 The access network device receives the first indication information sent by the core network device, and determines the time information according to the first indication information.
- the granularity of the time information determined by the access network device may be 1 us or 100 ns or 1 ms.
- Step 303 The access network device sends a system message (that is, a first indication message) to the terminal device, where the system message includes time information.
- a system message that is, a first indication message
- the access network device may extend the SIB for broadcast time in the SIB16 or 5G communication system in the LTE system (the specific number is not limited); or the access network device may also add a new SIB to carry the time information. That is, an SIB message based on SIB16-based enhanced time information is separately transmitted, such as SIB16a. In this case, in the subsequent step, when the terminal device performs time synchronization, it needs to perform calculation according to the contents of SIB16 and SIB16a.
- Step 304 The terminal device receives the system message and obtains time information.
- Step 305 The access network device sends a third indication message to the terminal device, where the third indication message includes uplink timing advance adjustment information.
- Step 306 The terminal device receives the third indication message, and the third indication message obtains a downlink one-way transmission delay.
- the terminal device may obtain the current uplink timing advance of the terminal device according to the previous uplink timing advance information and the uplink timing advance adjustment information, and further use the half of the current uplink timing advance of the terminal device as the downlink one-way. Transmission delay.
- Step 307 The terminal device synchronizes the clock of the terminal device according to the downlink one-way transmission delay and time information.
- step numbers are only an exemplary representation of the execution process, and do not constitute a specific limitation on the execution order.
- time synchronization between the terminal device and the access network device can be implemented without changing the chip of the terminal device.
- the granularity of the time information is 1 us or 100 ns or 1 ms, that is, a high-precision time unit, which can effectively improve the accuracy of time synchronization.
- FIG. 4 is a schematic flowchart of a time synchronization method according to Embodiment 3 of the present application. As shown in FIG. 4, the method includes:
- Step 401 The terminal device sends a request message to the access network device, where the request message may be an RRC message or a MAC CE message.
- the request message may include at least one of the following: the demand information of the time information, the granularity requirement information of the time information, the QoS information of the terminal device supporting the service, and the time type requested by the terminal device.
- Step 402 The access network device receives the request message, and determines time information according to the request message.
- Step 403 The access network device sends time information to the terminal device, where the time information may be carried by an RRC message or a MAC CE message.
- Step 404 The terminal device receives time information.
- Step 405 The access network device sends synchronization indication information to the terminal device.
- the synchronization indication information is used to indicate the manner in which the terminal device performs time synchronization. Specifically, the terminal device may be instructed to perform time synchronization directly according to the time information, or may also instruct the terminal device to perform one-way transmission according to the downlink.
- the delay time information is time synchronized.
- the synchronization indication information may include 1 bit, when the value is “0”, it is used to indicate that the terminal device directly performs time synchronization according to the time information, and when the value is “1”, it is used to indicate the terminal.
- the device performs time synchronization according to the downlink one-way transmission delay and time information.
- the synchronization indication information is used to indicate that the terminal device directly performs time synchronization according to the time information.
- Step 406 The terminal device synchronizes the clock of the terminal device according to the time information.
- step numbers are only an exemplary representation of the execution process, and do not constitute a specific limitation on the execution order.
- time synchronization between the terminal device and the access network device can be implemented without changing the chip of the terminal device. Moreover, since the access network device sends the time information to the terminal device in the case that the request message sent by the terminal device is received, time synchronization can be performed on demand to avoid wasting resources.
- step 401 is an optional step.
- the access network device may directly determine the time information, and send the time information to the terminal device through an RRC message or a MAC CE message.
- FIG. 5 is a schematic flowchart of a time synchronization method according to Embodiment 4 of the present application. As shown in FIG. 5, the method includes:
- Step 501 The terminal device sends a random access request to the access network device.
- the preamble of the random access request is a preset preamble and/or the PRACH used by the random access request is a preset PRACH, where the preset preamble or the preset PRACH is a preamble for requesting time information. Code or PRACH.
- Step 502 The access network device receives the random access request sent by the terminal device, and determines time information according to the random access request.
- the preset preamble for requesting the time information and/or the preset PRACH may be pre-agreed by the protocol; or the preset manner may be determined by the access network device and the terminal device through multiple manners. Preamble and / or preset PRACH.
- a possible implementation manner is that the access network device selects a preset preamble and/or a preset PRACH from multiple preambles and/or multiple PRACHs, and determines a preset preamble and/or a preset PRACH and time. And the mapping relationship is sent to the terminal device, and the terminal device receives and saves the mapping relationship.
- the preset preamble to be used for initiating the random access request may be determined according to the mapping relationship.
- the code and/or the preset PRACH, thereby implicitly informing the access network device that the purpose of the random access request is request time information.
- the preset preamble selected by the access network device is preamble0
- the preset PRACH is PRACH0.
- Table 2 it is a mapping between the preset preamble and/or the preset PRACH and the time request. Example.
- Table 2 An example of a mapping relationship
- the mapping relationship illustrated in Table 2 indicates that when the terminal device uses the PRACH0 to transmit the preamble0, or the PRACH other than the PRACH0 to send the preamble0, or the PRACH0 to send the preamble other than the preamble0, the purpose is to request the time information. .
- the access network device may determine time information according to the random access request.
- the terminal device When the terminal device sends a preamble other than the preamble0 using the PRACH other than the PRACH0, for example, the terminal device uses the PRACH1 to send the preamble1, which is a normal random access request, does not have the purpose of requesting time information, and accordingly, the access network
- the device can perform related processes of a normal random access procedure.
- mapping relationship between the preset preamble and/or the preset PRACH and the requested time type may be further set, as shown in Table 3.
- the mapping relationship illustrated in Table 3 indicates that when the terminal device sends the preamble0 using PRACH0, the time type of the request corresponds to UTC; when the terminal device sends the preamble0 using the PRACH other than PRACH0, the time type of the request corresponds to UTC and GPS. Time; when the terminal device uses PRACH0 to send other preambles other than preamble0, the time type of the request corresponds to UTC, GPS time and local time.
- the access network device can determine the time information according to the type of time requested by the terminal device.
- the time type for the request is further refined, so that the terminal device can select and use the corresponding preamble according to the requirement.
- the code and PRACH, without the need for additional information to inform the access network device of the type of time it requests, are not only easy to implement but also save resources.
- Table 2 and Table 3 are only an exemplary representation. In a specific implementation, the deformation may be performed on the basis of Table 2 and Table 3.
- the specific mapping relationship may be set according to actual needs, for example, The mapping relationship between the preset preamble and/or the granularity of the preset PRACH and the time information is not limited in this application.
- Step 503 The access network device sends time information to the terminal device, where the time information may be carried by an RRC message or a MAC CE message.
- Step 504 The terminal device receives time information.
- Step 505 The access network device sends an RAR to the terminal device, where the RAR includes uplink timing advance information.
- Step 506 The terminal device receives the RAR, and obtains a downlink one-way transmission delay according to the uplink timing advance information.
- Step 507 The terminal device synchronizes the clock of the terminal device according to the downlink one-way transmission delay and time information.
- step numbers are only an exemplary representation of the execution process, and do not constitute a specific limitation on the execution order.
- the time synchronization between the terminal device and the access network device can be implemented without changing the chip of the terminal device, and is applicable to terminal devices in different states, such as an idle state, a connected state, and a deactivated state, that is, Strong applicability; and the terminal device informs the access network device of the purpose of requesting time information in an implicit manner, thereby enabling time synchronization on demand.
- FIG. 6 is a schematic flowchart of a time synchronization method according to Embodiment 5 of the present application. As shown in Figure 6, it includes:
- Step 601 The access network device determines time information.
- the time information may include the time of the first time type, such as XX minutes XX minutes XX microseconds, or XX minutes XX minutes XX microseconds XX nanoseconds, wherein the first time type may correspond to UTC.
- the time information may further include a time difference of the first time type and other time types (GPS time or local time), such as a time difference of UTC and GPS time, a time difference of UTC and local time.
- GPS time or local time such as a time difference of UTC and GPS time, a time difference of UTC and local time.
- the time unit used by the time information may be any time unit with an accuracy higher than or equal to milliseconds (ms), such as microseconds (us), nanoseconds (ns), and higher possible future occurrences.
- ms milliseconds
- ns nanoseconds
- the granularity of the time information can be greater than or equal to 1 Any value less than or equal to **, such as the granularity of the time information is 50, the granularity of the time information is 50 ns, and the granularity of the time information is 100, and the granularity of the time information is 100 ns; another example When the time unit used by the time information is in microseconds, the granularity of the time information may be any value greater than or equal to 1 and less than or equal to **. For example, the granularity of the time information is 1, and the granularity of the time information is 1 us. For example, the granularity of the time information is 10, and the granularity of the time information is 10us.
- the granularity of the time information may be 1 us or 10 us or 50 ns or 100 ns or 1 ms, which is merely an exemplary enumeration based on the above description, and is not limited thereto, and all other values and time units that meet the above description constitute time.
- the granularity of the information is within the scope of the present application.
- the manner in which the access network device determines the time information may be various. For details, refer to the related description in the first embodiment.
- Step 602 The access network device sends a first indication message to the terminal device, where the first indication message includes time information of the terminal device.
- the access network device may send the first indication message to the terminal device by means of broadcast or unicast or multicast, which is not limited.
- the first indication message may be a system message, an RRC message, or a MAC CE message.
- the first indication message may further include at least one of the following: a time information reference point, and a time type.
- a time information reference point For details, refer to the description in the first embodiment.
- Step 603 The terminal device receives a first indication message sent by the access network device.
- the terminal device can receive the first indication message from the access network device by means of broadcast or unicast or multicast, and obtain time information.
- Step 604 The terminal device synchronizes the clock of the terminal device according to the time information.
- the terminal device may update the UTC of the terminal device to a time corresponding to the first time type included in the time information. Further, if the time information further includes a time difference between the UTC and the GPS time, and a time difference between the UTC and the local time, the terminal device may further calculate the GPS time and the local time.
- the terminal device may update any one of the UTC, the GPS time, and the local time according to the time information, or any combination thereof, which is not limited in this application.
- the granularity of the time information determined by the access network device is 1 us or 100 ns or 1 ms, that is, a high-precision time unit, the accuracy of time synchronization of the terminal device can be effectively improved.
- the present application provides a time synchronization method, the method includes: receiving, by a terminal device, a first time sent by an access network device; the terminal device acquiring a first transmission delay, and according to the first transmission delay and the Obtaining a fourth time at a time; the terminal device synchronizes the clock of the terminal device according to the fourth time.
- the first time includes a second time and a third time
- the second time is a millisecond time
- the third time is a microsecond time and/or a nanosecond time.
- the first time is based on a sum of the second time and the third time.
- the second time is 12:00:00:00, which is 12:00:00, 0 milliseconds
- the third time is 3 microseconds.
- the first time is 12:00:00:00:03, that is, 12 o'clock 0 minutes 0 seconds 0 milliseconds 3 microseconds.
- the second time is 12:00:00:00, which is 12:00:00, 0 milliseconds
- the third time is 3 microseconds and 5 nanoseconds.
- the first time is 12:00:00:00. :03:05, ie 12:00:0, 0 milliseconds, 3 microseconds, 5 nanoseconds.
- the access network device may send the second time to the terminal device by means of broadcast or unicast or multicast; and the access network device may send the terminal to the terminal by means of broadcast or unicast or multicast.
- the device sends the third time.
- the terminal device may receive the second time sent by the access network device by means of broadcast or unicast or multicast; and the terminal device may receive the connection by means of broadcast or unicast or multicast.
- the third time sent by the network access device may be
- the access network device may send the second time and the third time by using a message, for example, sending the second time and the third time by using a system message (such as the extended SIB16); or, the access network device may also be different.
- the second time and the third time are sent by the message, for example, the second time is sent by the system message (such as the SIB16), and the third time is sent by other messages (such as the RRC message), which is not limited.
- the method before the terminal device receives the first time sent by the access network device, the method further includes: the terminal device sends a first message to the access network device, where the first message includes a request for synchronizing the terminal device An indication of the clock;
- the first message includes at least one of the following: requesting a message at a first time, and requesting a message at a third time.
- the first message includes at least one of the following: accuracy information of a time that the terminal device needs to acquire, and a time type requested by the terminal device.
- the first message is one of the following: an RRC message, a media access control control element MAC CE message, and a random access request message for time synchronization.
- the first time and the fourth time represent times of a specific frame, a subframe, a slot, a mini slot, or a boundary of a symbol.
- the embodiment of the present application provides a time synchronization method, where the method includes: the terminal device sends a first message to the access network device, where the first message is used to request to acquire the fourth time; and the access network device receives the first message, Obtaining a fourth time, and sending a fourth time to the terminal device; the terminal device receives the fourth time sent by the access network device, and synchronizes the clock of the terminal device according to the fourth time.
- the access network device may obtain the fourth time based on the first time and the first transmission delay, so that the terminal can directly perform clock synchronization based on the received fourth time, thereby effectively The processing load of the terminal device is reduced, and the accuracy of clock synchronization is improved.
- the embodiment of the present application provides a communication device, and the specific implementation of the communication device can refer to the foregoing method flow.
- FIG. 7 is a schematic structural diagram of a communication device according to an embodiment of the present application.
- the communication device may be a terminal device, and is used to implement a corresponding process performed by the terminal device in the method embodiment shown in FIG. 2 to FIG. Steps, the communication device 700 includes:
- the transceiver module 701 is configured to receive a first time sent by the access network device.
- the processing module 702 is configured to acquire a first transmission delay, acquire a fourth time according to the first transmission delay and the first time, and synchronize a clock of the terminal device according to the fourth time.
- the first time includes a second time and a third time
- the second time is a millisecond time
- the third time is a microsecond time and/or a nanosecond time.
- the first time is obtained based on the sum of the second time and the third time.
- the terminal device receives the first time sent by the access network device, including:
- the terminal device receives the second time and the third time sent by the access network device by means of broadcast or unicast.
- the transceiver module 701 before receiving the first time sent by the access network device, is further configured to:
- the first message includes at least one of: requesting a message at a first time, requesting a message at a third time;
- the first message includes at least one of the following: accuracy information of a time that the terminal device needs to acquire, and a time type requested by the terminal device.
- the first message is one of the following: an RRC message, a medium access control control element MAC CE message, a random access request message for time synchronization.
- processing module 702 is specifically configured to:
- processing module 702 is specifically configured to:
- the receiving module is further configured to receive a first message sent by the access network device, where the first message includes the uplink timing advance information;
- the receiving module is further configured to: receive, by the access network device, a second message, where the second message includes uplink timing advance adjustment information, where the processing module 702 is specifically configured to: according to the previous uplink timing advance information and the uplink The timing advance adjustment information updates the current uplink timing advance information of the terminal device.
- the first time or the fourth time represents the time of a particular frame, subframe, slot, mini slot, or boundary of a symbol.
- the communication device 700 includes:
- the transceiver module 701 is configured to receive a first indication message sent by the access network device, where the first indication message includes time information of the terminal device, and the granularity of the time information is 1 us or 100 ns or 1 ms;
- the processing module 702 is configured to synchronize the clock of the terminal device according to the time information.
- FIG. 8 is a schematic structural diagram of a communication device according to an embodiment of the present application.
- the communication device may be an access network device, and is used to implement the method shown in FIG. 2 to FIG.
- the corresponding process or step, the communication device 800 includes:
- the processing module 802 is configured to determine the first time
- the transceiver module 801 is configured to send a first time to the terminal device, where the first time is used to synchronize the clock of the terminal device.
- the first time includes a second time and a third time
- the second time is a millisecond time
- the third time is a microsecond time and/or a nanosecond time.
- the first time is obtained based on the sum of the second time and the third time.
- the access network device sends the first time to the terminal device, including:
- the access network device sends the second time and the third time to the terminal device by means of broadcast or unicast.
- the method before the sending network device sends the first time to the terminal device, the method further includes:
- the first message includes at least one of: requesting a message at a first time, requesting a message at a third time;
- the first message includes at least one of the following: accuracy information of a time that the terminal device needs to acquire, and a time type requested by the terminal device.
- the first message is one of the following: an RRC message, a medium access control control element MAC CE message, a random access request message for time synchronization.
- the first time represents the time of a particular frame, subframe, slot, mini slot, or symbol boundary.
- the communication device 800 includes:
- the processing module 801 is configured to determine time information, where the granularity of the time information is 1 us or 100 ns or 1 ms;
- the transceiver module 802 is configured to send a first indication message to the terminal device, where the first indication message includes the time information.
- the division of the module in the embodiment of the present application is schematic, and is only a logical function division, and the actual implementation may have another division manner.
- the functional modules in the embodiments of the present application may be integrated into one processing module, or each module may exist physically separately, or two or more modules may be integrated into one module.
- the above integrated modules can be implemented in the form of hardware or in the form of software functional modules.
- the integrated modules if implemented in the form of software functional modules and sold or used as separate products, may be stored in a computer readable storage medium.
- the instructions include a plurality of instructions for causing a computer device (which may be a personal computer, a server, or a network access device, etc.) or a processor to perform all or part of the steps of the methods described in various embodiments of the present application.
- the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .
- FIG. 9 is a schematic structural diagram of still another communication device according to an embodiment of the present application.
- the communication device may be a terminal device, and is used to implement corresponding operations performed by the terminal device in the method embodiment shown in FIG. 2 to FIG.
- the communication device includes: a communication module 901, a processor 902;
- the communication module 901 is configured to perform communication interaction with other devices, and the communication module 901 may be an RF circuit, a WiFi module, a communication interface, a Bluetooth module, or the like.
- the processor 902 is configured to implement the function of the processing module 702 in FIG.
- the communication device 900 may further include: a memory 904, configured to store a program or the like.
- the program can include program code, the program code including instructions.
- Memory 904 may include RAM and may also include non-volatile memory, such as at least one disk storage.
- the processor 902 executes the application stored in the memory 904 to implement the above functions.
- the communication module 901, the processor 902, and the memory 904 can be connected to each other through the bus 903; the bus 903 can be a PCI bus or an EISA bus or the like.
- the bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 9, but it does not mean that there is only one bus or one type of bus.
- FIG. 10 is a schematic structural diagram of another communication device provided by the embodiment of the present application.
- the communication device may be a terminal device, and is used to implement the method performed by the terminal device in the method embodiment shown in FIG. 2 to FIG.
- the communication device includes: a communication module 1001, a processor 1002;
- the communication module 1001 is configured to perform communication interaction with other devices.
- the communication module 1001 may be an RF circuit, a WiFi module, a communication interface, a Bluetooth module, or the like.
- the processor 1002 is configured to implement the functions of the processing module 802 in FIG.
- the communication device 1000 may further include: a memory 1004, configured to store a program or the like.
- the program can include program code, the program code including instructions.
- the memory 1004 may include RAM and may also include non-volatile memory, such as at least one disk storage.
- the processor 1002 executes the application stored in the memory 1004 to implement the above functions.
- the communication module 1001, the processor 1002, and the memory 1004 may be connected to each other through the bus 1003; the bus 1003 may be a PCI bus or an EISA bus or the like.
- the bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in FIG. 10, but it does not mean that there is only one bus or one type of bus.
- the access network device broadcasts time through the SIB16, such as UTC, etc., and the terminal device synchronizes the time of the terminal device according to the received time.
- the time unit of the time for the access network device to broadcast is 10 ms, the time synchronization is not accurate enough.
- the embodiment of the present application further provides a time synchronization method, including: determining, by the access network device, time information, and The terminal device sends the time information; correspondingly, the terminal device receives the time information sent by the access network device, and obtains the first time according to the time information, and the terminal device can synchronize the time of the terminal device according to the first time. .
- the time unit of the first time is n microseconds or n nanoseconds or n femtoseconds or n milliseconds, n>0, when the time unit is n milliseconds, n ⁇ 10, so that the first time
- the high precision can effectively improve the accuracy of time synchronization.
- the time unit here can also be a time unit or time granularity or time accuracy.
- the time unit in the first time in the embodiment of the present application may also be a fixed-length time unit, such as n TTIs, n slots, n mini-slots, n subframes, n frames, and n symbols. Etc., n>0, the specific is not limited.
- the time information indicates the first time
- the time information may be the first value.
- the first value may be 2
- the terminal device may further receive the first indication information from the access network device, where the first indication information is used to indicate a time unit of the first time, such as 3 microseconds;
- the terminal device may obtain the first time as 6 microseconds, according to the first value and the time unit of the first time (for example, multiplying the first value and the time unit of the first time: 2*3 microseconds), It can be understood that the first time is a high-precision part of a certain time.
- the first value may be 2, and the time unit of the first time is a preset time unit (which may be determined by the access network device and the terminal device, or specified by the protocol), such as 4 microseconds.
- the first time can be understood as a certain point in time: for example, January 1, 2017, 1:10, 5, 1 millisecond, 1 microsecond.
- the first value is a bit string, and the high-order to low-order bits respectively represent year, month, day, hour, minute, second, millisecond, microsecond, etc., year, month, day, hour, minute, second, millisecond, microsecond respectively Represented by different groups of bits, each bit group has a fixed bit, for example, the bit group indicating the year is the upper 16 bits, and sequentially, the bit group indicating the month is the next 4 bits (the 5th bit to the 8th bit of the high bit),
- the bit group indicating the day is 5 bits (the 9th bit to the 13th bit of the upper bit)
- the bit group at the time of presentation is 5 bits (the 14th bit to the 18th bit of the upper bit)
- the bit group indicating the bit is 6 bits (the 14th bit to the 18th bit of the upper bit)
- the second is 6bit (the
- the fifth time indicated by the first time is 16:1 minute, 36 seconds, 1 millisecond, and 1 microsecond on August 4, 2048, when the first time is directly equal to the fifth time.
- the first time is the full time.
- the terminal device can directly use the time of synchronizing the terminal device at the first time.
- the first time is 8:1:1, 1 second, 1 microsecond on February 12, 2017, and the terminal device can update the time of the terminal device to the first time.
- the first time is the time of the high precision part, and further, the first time may be the time less than 10 milliseconds.
- the terminal device can receive the second time sent by the access network device (in a specific implementation, the access network device can send the second time by using unicast or broadcast or multicast), and the time unit of the second time It is 10 milliseconds, and combined with the first time and the second time (for example, adding the first time and the second time) to obtain the third time.
- the first time is a time of less than 10 milliseconds in the third time.
- the first time that the terminal device obtains is 6 microseconds
- the second time is 8:1 minute, 1 second, and 10 milliseconds.
- the second time can be obtained from the SIB16, and the third time is 8:1. Divided into 1 second, 10 milliseconds, and 6 microseconds.
- the terminal device may also acquire a preset time, which may be a time point specified by the protocol (for example, may be a certain time point in the past), such as 0:00:00 on February 12, 2017, thus, The terminal device adds the third time to the preset time to obtain the fifth time, February 12, 2017, 8:1, 1 second, 10 milliseconds, 6 microseconds, and the time of the terminal device can be obtained.
- the synchronization is 8:1:1, 10, and 10 microseconds on February 12, 2017.
- the terminal device can also obtain the fifth time in combination with the timing advance.
- the first time here can be understood as a time period or a time length or a time domain length.
- the first time is equal to 0, 0, 0, 1 hour, 1 minute, 1 second, 1 millisecond, 1 microsecond (or 366,100, 1000 microseconds), and the terminal device can be based on the first time and a preset time (the preset time is a time) Point or time, for example, January 1, 2017 0:00:00, the sum of the fifth time is January 1, 2017, 1:1, 1 minute, 1 second, 1 microsecond (the same, the terminal equipment also The fifth time can be obtained in conjunction with the timing advance):
- the preset time may be the time origin of the UTC time, 0:00:00 on January 1, 1900, or the time origin of the GPS time, January 6, 1980, 0:00:00.
- the value of the high-precision part is 0 (0 microseconds and 0 nanoseconds) in the calculation.
- a plurality of possible operations may be performed according to the fifth time, for example, the time of the terminal device is synchronized according to the fifth time.
- the fifth time is the GPS time
- the preset time is the time origin of the GPS time, January 6, 1980, 0:00:00.
- the time origin represents the starting point of time.
- FIG. 11 is a schematic flowchart of a time synchronization method according to Embodiment 1 of the present application. As shown in Figure 11a, it includes:
- Step 1101 the access network device determines time information, where the time information includes a first value, where the first value is used to indicate a first time, and the time unit of the first time is n microseconds or n nanoseconds or n Femtosecond or n milliseconds.
- the access network device can determine the time information according to its own capabilities. For example, the time unit supported by the capability of the access network device is 1 microsecond, and the time unit of the first time indicated by the first value is 1 microsecond.
- step 1100 the terminal device sends the first message.
- the access network device may determine the first value according to the first message sent by the terminal device.
- the first message is used to request the access network device to send the first value to the terminal device.
- the first message may indicate a time unit of the first value required by the terminal; and may also indicate whether the message where the first value is located needs to be encrypted and/or integrity protected; and may also indicate a time standard that the terminal device needs to perform time synchronization. For example, GPS time or UTC time.
- Step 1102 The access network device sends a unicast message to the terminal device, where the unicast message includes the first value.
- the unicast message may be an RRC message or a MAC CE or a DCI, which is not limited.
- Step 1103 The terminal device receives the unicast message sent by the access network device, and obtains the first value.
- the unicast message may further include a frame number of the first system frame, so that the terminal device may obtain the system frame corresponding to the fifth time according to the frame number of the first system frame and the frame number of the second system frame, where
- the second system frame is a system frame in which the terminal device receives the first value (that is, a system frame for successfully transmitting a unicast message carrying a first value).
- the fifth time corresponds to a frame header boundary or a frame tail boundary of the first system frame, and the time information reference point of the first system frame that can be regarded as a fifth time is used to indicate the fifth time obtained by the terminal device. Corresponding time domain location.
- the distance between the two system frames may refer to a time domain interval (calculated in frames) of the frame header of two frames or a time interval of the frame ends of two frames.
- the time information reference point is a frame header or a frame tail boundary of the first frame; the frame number of the first frame is the first system frame number, and the first system frame is A system frame that is closest to the second system frame and has a frame number equal to the first system frame number. Further, when the frame number of the first system frame is the same as the frame number of the second system frame, the first system frame is the second system frame.
- the terminal device receives the first value in the SFN6, that is, the frame number of the system frame where the first value is located is 6, indicating that the frame number of the second system frame is 6, if the first system frame indicated in the unicast message The frame number is 8, and the first system frame is the nearest SFN8 after SFN6.
- the distance between two system frames may refer to a time domain interval (calculated by the number of frames) of the frame header of two frames or a time interval of the frame ends of two frames.
- the (time domain position or position) is the frame header or the end of the system frame of the system frame whose frame number is the first frame number which is closest to the second system frame before the second system frame.
- the time reference point for the first time For example, the frame number of the first system frame carried in the unicast message is 990, and the frame number of the UE successfully receiving the unicast message is 25, and the UE finds a frame 990 closest to the 25 frames in front of the time domain position of the 25 frames ( The time domain position is 990 frames of the previous 1024 frame period) and it is determined that the first time corresponds to the time corresponding to the frame header or the frame tail boundary of the 990 frame.
- the time frame or the end of the frame of the system frame whose frame number is the first frame number closest to the second system frame after the second system frame is the time of the first time Reference point.
- the frame number of the first system frame carried in the unicast message is 990
- the frame number of the UE successfully receiving the unicast message is 25, and the UE finds a frame 990 closest to the 25 frames after the time domain position of the 25 frames ( The time domain position is 990 frames of the 1024 frame period) and it is determined that the first time corresponds to the time corresponding to the frame header or the end of the frame of the 990 frame.
- Example 3 (time domain location or location) includes a frame header or a frame tail boundary of a system frame whose frame number is the first frame number before and after the second system frame, and the frame number is the first frame number is the first time Time reference point.
- the frame number of the first system frame carried in the unicast message is 990
- the nearest 990 frame is the 990 frame with the time domain position being the previous 1024 frame period. And determining that the first time corresponds to the frame header or the end of the frame of the 990 frame.
- Step 1104 The terminal device obtains the first time according to the first value. Further, the terminal device may further obtain the fifth time according to the first time, and synchronize the time of the terminal device according to the fifth time.
- the first value indicates the first time.
- the time unit of the first time is preset, for example, the access network device and the terminal device pre-negotiate the time unit of the first time, and at this time, the first value sent by the access network device is available for And indicating the value of the first time; correspondingly, after receiving the first value, the terminal device may obtain the first time according to the first value indicated by the indication information and the time unit of the preset first time.
- the preset time unit is 1 microsecond
- the time unit of the first time is explicitly indicated by the first value, and at this time, the first value may include two parts of values (for convenience of description, the first part value and the second part value are referred to as And wherein the first partial value is used to indicate the time unit of the first time, and the second partial value is used to indicate the value of the first time.
- the terminal device may obtain the first time according to the value of the first time indicated by the value of the first part and the time unit of the first time indicated by the value of the second part.
- the first partial value may include any one of 0, 1, and 2, and 0, 1, and 2 respectively correspond to different time precisions, and the specific correspondence may be preset.
- the time unit corresponding to 0 is 1 In microseconds
- the corresponding time unit of 1 is 1 ns
- the corresponding time unit of 2 is 10 ns.
- the first partial value includes a total of 4 bits, the first bit indicates whether the time unit of 1 ms is supported, the second bit indicates whether the time unit of 10 microseconds is supported, and so on. Assume that 1 indicates support and 0 indicates no support. When the terminal device determines that the first partial value is 1110, it indicates that the time unit transmitted by the access network device is 1 microsecond. Since the last 1-bit bit is 0, it indicates that the time unit of 1 ns is not supported.
- the first value is used to indicate the first partial value of the time unit
- such a manner of indicating the time unit may be referred to as a display mode.
- the first time value may be indicated by the first value, and the time unit of the first time may be indicated by the separate indication information.
- the first value and the indication information may be different.
- the message is sent, specifically not limited.
- the time unit of the first time is implicitly indicated by the first value, and at this time, the first value may include values of a plurality of parameters, and the plurality of parameters correspond to different time units.
- the terminal device may obtain the multiple times according to the value of the multiple parameters and the time unit corresponding to the multiple parameters, and then obtain the first time according to the sum of the multiple times.
- the values of the multiple parameters may be carried by multiple fields respectively.
- the values carried by the four domains are used to indicate the time unit of the first time, that is, the time unit corresponding to the domain 1 is 10 ms, the time unit corresponding to the domain 2 is 1 ms to 10 ms, and the time unit corresponding to the domain 3 is 1 microsecond - 1 ms, the time unit corresponding to domain 3 is 1 ns - 1 microsecond. If a domain does not carry a value, for example, the domain 3 does not carry a value, the terminal device may determine that the time unit of the first time is the time unit corresponding to the domain 2, and does not continue to parse the domain 4, thereby effectively saving processing overhead. .
- the access network device may send the complete year, month, day, minute, and second to the first time of the microsecond by the unicast message when the year, month, and day change (in the first time) The unit is in the case of microseconds.
- the unicast message is sent to the terminal device for the time, minute, and second, and the time unit of the year, month, and day is no longer sent.
- the terminal device can obtain the complete first time in combination with the previously stored year, month and day.
- the unicast message may carry an indication information (for example, 1 bit), where the indication information is used to indicate a time unit that does not carry the year, month, and day.
- the terminal device can obtain the previously stored year, month, and day according to the indication information, as shown in FIG. 11c, which is a time information diagram of not carrying the year, month, and day.
- the time unit in which the access network device does not transmit the year and month may be used when the year and month have not changed, or It may also be that when the year does not change, the access network device does not send the time unit of the year, and there may be multiple possibilities, which are not enumerated one by one.
- FIG. 12 is a schematic flowchart of a time synchronization method according to Embodiment 2 of the present application. As shown in Figure 12a, it includes:
- Step 1201 The access network device determines a first value, where the first value is used to indicate the first time, and the time unit of the first time is n microseconds or n nanoseconds or n femtoseconds or n milliseconds.
- Step 1202 The access network device sends a first system message block to the terminal device, where the first system message block includes the first value.
- the first system message block may be the SIB 16, or may be another system message block, which is not limited.
- Step 1203 The terminal device receives the first system message block sent by the access network device, and obtains the first value.
- Step 1204 The terminal device obtains the first time according to the first value, and further, obtains the fifth time according to the first time, and synchronizes the time of the terminal device according to the fifth time.
- the first value may be carried in the SIB16, and the domain carrying the first value is all in the domain of r15.
- the manner in which the first value indicates the first time may be referred to in the first embodiment. description of. That is to say, in this implementation manner, the difference between the second embodiment and the implementation one is that the second embodiment receives the first value through the first system message block, and the first embodiment uses the unicast message. The first value is received, and anything other than this difference can be referred to each other.
- the time information includes a first value, where the first value includes the first information and the second information, where the first information is used to indicate the second time, and the second information is used to indicate the third time
- the time unit of the second time may be y milliseconds
- the time unit of the third time may be n microseconds or n nanoseconds or n femtoseconds or n milliseconds.
- the first system message block is the SIB16
- the domain carrying the first information is the domain of the r11 in the original SIB16. Therefore, the time unit obtained according to the first information is the time unit. 10ms, the domain carrying the second information is the domain of the extended r15. That is to say, the access network device can extend a new domain based on the original SIB16, and the new domain carries the second information. For example, if the time unit of the first time is 1 microsecond, the new domain carries The third time indicated by the second information may be between 1 microsecond and 10 ms, as shown in FIG. 12b, which is a schematic diagram of the extended SIB16.
- the terminal device can obtain the second time with the time unit being 10 ms in combination with the original SIB16, and then obtain the third time in which the time unit in the range of 10 ms is 1 microsecond granularity according to the newly added domain, and combine the two to obtain the first time ( That is timeInfoUTC-r11*10ms+timeInfo-r15*1 microseconds, which is accurate to 1 microsecond time unit.
- the first time obtained by the terminal device is timeInfoUTC-r11*10ms+timeInfo-r15. *1Ts, where 1 Ts is 1/30.72 ns, which is approximately equal to 32.55 ns.
- the newly added timeInfo-r15 may also be broadcasted by a new SIB (for example, SIB20), which is the second system message block and the third system described in the third embodiment.
- SIB20 is the second system message block and the third system described in the third embodiment.
- a message block is used to send time information.
- the terminal device needs to combine the first information carried by the original SIB16 and the second information carried by the newly added domain to obtain the first time. Therefore, the solution requires the terminal device of the r15.
- the characteristics of SIB16 in r11 must be supported, that is, the relevant domain of r11 must be listened to.
- the manner in which the second information indicates the third time may be multiple.
- the first time value described in the first embodiment may be used to indicate the first time, for example, as shown in FIG. 12d.
- FIG. 12e is a first numerical diagram of another explicit mode indication. In FIG. 12e, the time unit is indicated by 4 bits, and details are not described herein.
- the manner in which the first information indicates the second time may be implemented in the existing implementation manner, or may be referred to the manner described in the first embodiment, and details are not described herein again.
- the first value is broadcasted by using a system message block, and the first value is obtained by the terminal device by parsing a system message block, and the first time indicated by the first value has high precision, thereby being capable of Ensure the accuracy of time synchronization of the terminal equipment.
- FIG. 13 is a schematic flowchart of a time synchronization method according to Embodiment 4 of the present application. As shown in Figure 13, it includes:
- step 1301 the access network device determines time information.
- the time information includes a first value
- the first value may include the first information and the second information, wherein the first information is used to indicate the second time, and the second information is used to indicate the third time.
- the time unit of the second time may be y milliseconds
- the time unit of the third time may be n microseconds or n nanoseconds or n femtoseconds or n milliseconds.
- Step 1302 The access network device sends a first system message block and a second system message block to the terminal device, where the first system message block includes first information, and the first system message block includes second information.
- Step 1303 The terminal device receives the first system message block and the second system message block sent by the access network device, and obtains the second time according to the first information in the first system message block, and according to the second system message block.
- the second message gets the third time.
- Step 1304 The terminal device obtains the first time according to the second time and the third time, and synchronizes the time of the terminal device according to the first time.
- the first system message block may be the SIB16
- the second system message block may be other system message blocks, such as the SIB20.
- the domain carrying the first information is the domain of r11 in the original SIB16
- the domain carrying the second information may be the domain of the new r15 in the SIB20.
- the manner in which the first information indicates the second time and the manner in which the second information indicates the third time may be various. For details, refer to the description in the second embodiment, and details are not described herein again.
- the difference between the third embodiment and the second embodiment is that in the second embodiment, the time information is sent through a system message block, and in the second embodiment, the time information is sent through two system message blocks, except for the difference. Other than that, it can be cross-referenced.
- FIG. 14 is a schematic flowchart of a time synchronization method according to Embodiment 4 of the present application. As shown in Figure 14, it includes:
- step 1401 the access network device determines time information.
- the time information includes a first value
- the first value may include the first information and the second information, wherein the first information is used to indicate the second time, and the second information is used to indicate the third time.
- Step 1402 The access network device sends a system message and a unicast message to the terminal device, where the system message includes the first information, and the unicast message includes the second information.
- the unicast message may be an RRC message or a MAC CE, which is not limited.
- Step 1403 The terminal device receives the system message and the unicast message sent by the access network device, obtains the second time according to the first information in the system message, and obtains the third time according to the second information in the unicast message.
- Step 1404 The terminal device obtains the first time according to the second time and the third time, and synchronizes the time of the terminal device according to the first time.
- the access network device may broadcast the first information by using the original SIB16, and send the second information by using the unicast message, which requires the terminal device to listen and carry the first information before receiving the second information of the unicast message.
- System messages for information, including connected devices, also need to be listened to.
- the time unit of the first time is 1 microsecond
- the time unit of the third time indicated by the second information carried by the unicast message is between 1 microsecond and 10 milliseconds
- the first information indication carried by the system message is The time unit of the second time is 10 milliseconds
- the time unit of the third time indicated by the second information carried by the unicast message is between 1 microsecond and 20 microseconds
- the first information carried by the system message indicates the first The time unit of the two time is 20 microseconds.
- the unicast message may further carry a time information reference point, where the time information reference point is consistent with the time information reference point carried in the system message.
- the time information reference point carried by the unicast message may be a time information reference point corresponding to the system currently received by the terminal device or currently stored, for example, the terminal device receives the system message in SFN1 (egSIB16 or other)
- the first information in the SIB is the second information of the unicast message received by the SFN6, and the time information reference point corresponding to the second information of the unicast message is the time information reference point corresponding to the first information in the system message.
- the manner in which the second information indicates the third time may be multiple.
- the first time value described in the first embodiment may be used to indicate the first time. Narration.
- the manner in which the first information indicates the second time may be in the existing implementation manner, or the manner in which the first time is indicated by the time information described in the first embodiment may be used, and details are not described herein again.
- Embodiments 1 to 4 are different implementation manners of the time synchronization method provided by the present application, which are all based on the same inventive concept, and other contents except the differences between the different embodiments may be mutually referred to. .
- the embodiment of the present application further provides a terminal device and an access network device.
- a terminal device and an access network device For the specific implementation of the terminal device and the access network device, refer to the foregoing method flow.
- FIG. 15 is a schematic structural diagram of a terminal device according to an embodiment of the present disclosure.
- the terminal device is configured to perform the process steps performed by the terminal device in the foregoing Embodiments 1 to 4, as shown in FIG.
- a processing module 1501 and a transceiver module 1502 are included.
- the transceiver module 1502 is configured to: receive a first value sent by the access network device, where the first value is used to indicate the first time;
- the processing module 1501 is configured to: obtain the first time according to the first value, where the time unit of the first time is n microseconds or n nanoseconds or n femtoseconds or n milliseconds, and n is greater than 0; When the time unit is n milliseconds, n is less than 10.
- the transceiver module 1502 is further configured to: receive, by the access network device, first indication information that is sent by using a system message or a unicast message or a multicast message, where the first indication information is used to indicate The time unit of the first time;
- the processing module 1501 is specifically configured to: obtain the first time according to a product of the first value and a time unit of the first time.
- the time unit of the first time is a preset time unit
- the processing module 1501 is specifically configured to: obtain, by the terminal device, the first time according to a product of the first value and the preset time unit.
- the transceiver module 1502 is further configured to: receive, by broadcast or unicast or multicast, a second time sent by the access network device, where the time unit of the second time is 10 millisecond;
- the processing module 1501 is specifically configured to: add the first time to the second time to obtain a third time.
- the processing module 1501 is further configured to: obtain a fifth time according to the sum of the first time and the preset time, and synchronize the time of the terminal device according to the fifth time.
- the transceiver module 1502 is specifically configured to: receive a unicast message sent by the access network device, where the unicast message includes the first value.
- the unicast message further includes a first system frame number
- the processing module 1501 is further configured to: obtain a first system frame corresponding to the fifth time according to the frame number of the first system frame and the frame number of the second system frame; and the second system frame is the first value System frame.
- the fifth time corresponds to a frame header boundary or a frame tail boundary of the first system frame
- the first system frame is a system frame that is closest to the second system frame and has a frame number equal to a frame number of the first system frame;
- the first system frame is a system frame that is in front of the second system frame and is closest to the second system frame and has a frame number equal to a frame number of the first system frame;
- the first system frame is a system frame that is closest to the second system frame after the second system frame and has a frame number equal to a frame number of the first system frame;
- the first system frame is the second system frame.
- the transceiver module 1502 is specifically configured to: receive a first system message block sent by the network device, where the first system message block includes the first value.
- the first value includes values of a plurality of parameters, the plurality of parameters corresponding to different time units;
- the processing module 1501 is specifically configured to: obtain the first time according to values of the plurality of parameters included in the first value.
- the transceiver module 1502 is further configured to: send a first message to the access network device, where the first message is used to request the access network device to send the first message to the terminal device A value.
- FIG. 16 is a schematic structural diagram of an access network device according to an embodiment of the present disclosure, where the access network device is configured to perform the process steps performed by the access network device in the foregoing Embodiments 1 to 4, as shown in FIG.
- the access network device 1600 includes a processing module 1601 and a transceiver module 1602.
- the processing module 1601 is configured to: determine a first value, where the first value is used to indicate a first time, where the time unit of the first time is n microseconds or n nanoseconds or n femtoseconds or n milliseconds, n Greater than 0; when the time unit is n milliseconds, n is less than 10;
- the transceiver module 1602 is configured to: send the first value to the terminal device.
- the transceiver module 1602 is further configured to: send the first indication information to the terminal device by using a system message or a unicast message or a multicast message, where the first indication information is used to indicate the first Time unit of time;
- the first time is obtained by the terminal device according to a product of the first value and a time unit of the first time.
- the time unit of the first time is a preset time unit, and the first time is obtained by the terminal device according to a product of the first value and the preset time unit.
- the transceiver unit is further configured to: send a second time to the terminal device by means of broadcast or unicast or multicast, where the time unit of the second time is 10 milliseconds;
- the third time is obtained by the terminal device adding the first time and the second time.
- the transceiver module 1602 is specifically configured to: send a unicast message to the terminal device, where the unicast message includes the first value.
- the unicast message further includes a first system frame number
- the first system frame corresponding to the fifth time is obtained by the terminal device according to the frame number of the first system frame and the frame number of the second system frame; the second system frame is that the terminal device receives the The system frame of the first value.
- the fifth time corresponds to a frame header boundary or a frame tail boundary of the first system frame
- the first system frame is a system frame that is closest to the second system frame and has a frame number equal to a frame number of the first system frame;
- the first system frame is a system frame that is in front of the second system frame and is closest to the second system frame and has a frame number equal to a frame number of the first system frame;
- the first system frame is a system frame that is closest to the second system frame after the second system frame and has a frame number equal to a frame number of the first system frame;
- the first system frame is the second system frame.
- the transceiver module 1602 is specifically configured to: send a first system message block to the terminal device, where the first system message block includes the first value.
- the first value includes a value of a plurality of parameters, and the plurality of parameters correspond to different time units; the first time is that the terminal device obtains according to values of the plurality of parameters of.
- the transceiver module 1602 is further configured to: receive a first message sent by the terminal device, where the first message is used to request the access network device to send the first message to the terminal device Value.
- FIG. 17 is a schematic structural diagram of a communication device according to an embodiment of the present disclosure, where the communication device may be a terminal device or an access network device; the communication device includes: a communication module 1701, a processor 1702;
- the communication module 1701 is configured to perform communication interaction with other devices, and the communication module may be an RF circuit, a WiFi module, a communication interface, a Bluetooth module, or the like.
- the processor 1702 is configured to implement the functions of the processing module 1501 in FIG. 15 or the processing module 1601 in FIG.
- the communication device may further include: a memory 1704, configured to store a program or the like.
- the program can include program code, the program code including instructions.
- the memory 1704 may include a random access memory (RAM), and may also include a non-volatile memory, such as at least one disk storage.
- the processor executes the application stored in the memory to implement the above functions.
- the communication module 1701, the processor 1702, and the memory 1704 can be connected to each other through a bus 1703;
- the bus 1703 can be a peripheral component interconnect (PCI) bus or an extended industry standard structure (extended industry) Standard architecture, EISA) bus, etc.
- PCI peripheral component interconnect
- EISA extended industry standard structure
- the bus can be divided into an address bus, a data bus, a control bus, and the like.
- the above embodiments it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
- software it may be implemented in whole or in part in the form of a computer program product.
- the computer program product includes one or more computer instructions.
- the computer program instructions When the computer program instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present invention are generated in whole or in part.
- the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
- the computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center Transmission to another website site, computer, server or data center by means of wire (eg coaxial cable, fiber optic, digital subscriber line (DSL)) or system (eg infrared, system, microwave, etc.).
- the computer readable storage medium can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or the like that includes one or more available media.
- the usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (such as a solid state disk (SSD)).
- the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
- the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
- These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
- the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.
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Abstract
Description
Claims (60)
- 一种时间同步方法,其特征在于,所述方法包括:终端设备接收接入网设备发送的第一时间;所述终端设备获取第一传输时延,并根据所述第一传输时延和所述第一时间获取第四时间;所述终端设备根据所述第四时间同步所述终端设备的时间。
- 根据权利要求1所述的方法,其特征在于,所述第一时间包括第二时间和第三时间;所述第二时间为毫秒级时间,所述第三时间为微秒级时间或纳秒级时间。
- 根据权利要求2所述的方法,其特征在于,所述第一时间是根据所述第二时间与所述第三时间的和得到的。
- 根据权利要求2所述的方法,其特征在于,所述终端设备接收接入网设备发送的第一时间,包括:所述终端设备通过广播或单播或组播的方式接收所述接入网设备发送的所述第二时间和第三时间。
- 根据权利要求2所述的方法,其特征在于,在所述终端设备接收接入网设备发送的第一时间之前,还包括:所述终端设备向所述接入网设备发送第一消息,所述第一消息用于请求同步所述终端设备的时间;所述第一消息包括以下至少一项:请求第一时间的消息;请求第三时间的消息。
- 根据权利要求5所述的方法,其特征在于,所述第一消息包括以下至少一项:所述终端设备需要获取的时间的精度信息;所述终端设备请求的时间类型。
- 根据权利要求5所述的方法,其特征在于,所述第一消息是以下一项:无线资源控制RRC消息;媒体接入控制控制元素MAC CE消息;用于时间同步的随机接入请求消息。
- 根据权利要求1至7中任一项所述的方法,其特征在于,所述终端设备根据所述第一传输时延和所述第一时间获取第四时间,包括:所述终端设备根据所述第一时间与所述第一传输时延的和获取所述第四时间。
- 根据权利要求1至8中任一项所述的方法,其特征在于,所述终端设备获取第一传输时延,包括:所述终端设备获取上行定时提前信息,并根据所述上行定时提前信息获取所述第一传输时延。
- 根据权利要求9所述的方法,其特征在于,所述终端设备获取上行定时提前信息包括:所述终端设备接收接入网设备发送的第一消息,所述第一消息中包括所述上行定时提 前信息;或者,所述终端设备接收接入网设备发送第二消息,所述第二消息包括上行定时提前调整信息,所述终端设备根据前次上行定时提前信息和所述上行定时提前调整信息更新所述终端设备当前的上行定时提前信息。
- 根据权利要求1至10中任一项所述的方法,其特征在于,所述第一时间或者所述第四时间表示的是一个特定的帧,子帧,时隙slot,微时隙mini slot或者符号的边界的时间。
- 一种时间同步方法,其特征在于,所述方法包括:接入网设备确定第一时间;所述接入网设备向终端设备发送第一时间,所述第一时间用于同步所述终端设备的时间。
- 根据权利要求12所述的方法,其特征在于,所述第一时间包括第二时间和第三时间;所述第二时间为毫秒级时间,所述第三时间为微秒级时间或纳秒级时间。
- 根据权利要求13所述的方法,其特征在于,所述第一时间是根据所述第二时间与所述第三时间的和得到的。
- 根据权利要求13所述的方法,其特征在于,所述接入网设备向终端设备发送第一时间,包括:所述接入网设备通过广播或单播或组播的方式向所述终端设备发送所述第二时间和所述第三时间。
- 根据权利要求13所述的方法,其特征在于,在所述接入网设备向终端设备发送第一时间之前,还包括:所述接入网设备接收所述终端设备发送的第一消息,所述第一消息用于请求同步所述终端设备的时间;所述第一消息包括以下至少一项:请求第一时间的消息;请求第三时间的消息。
- 根据权利要求16所述的方法,其特征在于,所述第一消息包括以下至少一项:所述终端设备需要获取的时间的精度信息;所述终端设备请求的时间类型。
- 根据权利要求16所述的方法,其特征在于,所述第一消息是以下一项:RRC消息;媒体接入控制控制元素MAC CE消息;用于时间同步的随机接入请求消息。
- 根据权利要求12至18中任一项所述的方法,其特征在于,所述第一时间表示的是一个特定的帧,子帧,时隙slot,微时隙mini slot或者符号的边界的时间。
- 一种终端设备,其特征在于,所述终端设备包括:收发模块,用于接收接入网设备发送的第一时间;处理模块,用于获取第一传输时延,并根据所述第一传输时延和所述第一时间获取第四时间;以及根据所述第四时间同步所述终端设备的时间。
- 根据权利要求20所述的终端设备,其特征在于,所述第一时间包括第二时间和第三时间;所述第二时间为毫秒级时间,所述第三时间为微秒级时间或纳秒级时间。
- 根据权利要求21所述的终端设备,其特征在于,所述第一时间是根据所述第二时间与所述第三时间的和得到的。
- 根据权利要求21所述的终端设备,其特征在于,所述终端设备接收接入网设备发送的第一时间,包括:所述终端设备通过广播或单播或组播的方式接收所述接入网设备发送的所述第二时间和第三时间。
- 根据权利要求21所述的终端设备,其特征在于,在接收接入网设备发送的第一时间之前,所述收发模块还用于:向所述接入网设备发送第一消息,所述第一消息用于请求同步所述终端设备的时间;所述第一消息包括以下至少一项:请求第一时间的消息;请求第三时间的消息。
- 根据权利要求24所述的终端设备,其特征在于,所述第一消息包括以下至少一项:所述终端设备需要获取的时间的精度信息;所述终端设备请求的时间类型。
- 根据权利要求24所述的终端设备,其特征在于,所述第一消息是以下一项:RRC消息;媒体接入控制控制元素MAC CE消息;用于时间同步的随机接入请求消息。
- 根据权利要求20至26中任一项所述的终端设备,其特征在于,所述处理模块具体用于:根据所述第一时间与所述第一传输时延的和获得所述第四时间。
- 根据权利要求20至27中任一项所述的终端设备,其特征在于,所述处理模块具体用于:获取上行定时提前信息,并根据所述上行定时提前信息获取所述第一传输时延。
- 根据权利要求28所述的终端设备,其特征在于,所述接收模块还用于,接收接入网设备发送的第一消息,所述第一消息中包括所述上行定时提前信息;或者,所述接收模块还用于,接收接入网设备发送第二消息,所述第二消息包括上行定时提前调整信息,所述处理模块具体用于,根据前次上行定时提前信息和所述上行定时提前调整信息更新所述终端设备当前的上行定时提前信息。
- 根据权利要求20至29中任一项所述的终端设备,其特征在于,所述第一时间或者所述第四时间表示的是一个特定的帧、子帧、时隙slot、微时隙mini slot或者符号的边界的时间。
- 一种接入网设备,其特征在于,所述接入网设备包括:处理模块,用于确定第一时间;收发模块,用于向终端设备发送第一时间,所述第一时间用于同步所述终端设备的时 间。
- 根据权利要求31所述的接入网设备,其特征在于,所述第一时间包括第二时间和第三时间;所述第二时间为毫秒级时间,所述第三时间为微秒级时间或纳秒级时间。
- 根据权利要求32所述的接入网设备,其特征在于,所述第一时间是根据所述第二时间与所述第三时间的和得到的。
- 根据权利要求32所述的接入网设备,其特征在于,所述接入网设备向终端设备发送第一时间,包括:所述接入网设备通过广播或单播或组播的方式向所述终端设备发送所述第二时间和所述第三时间。
- 根据权利要求32所述的接入网设备,其特征在于,在所述接入网设备向终端设备发送第一时间之前,还包括:所述接入网设备接收所述终端设备发送的第一消息,所述第一消息用于请求同步所述终端设备的时钟;所述第一消息包括以下至少一项:请求第一时间的消息;请求第三时间的消息。
- 根据权利要求35所述的接入网设备,其特征在于,所述第一消息包括以下至少一项:所述终端设备需要获取的时间的精度信息;所述终端设备请求的时间类型。
- 根据权利要求35所述的接入网设备,其特征在于,所述第一消息是以下一项:RRC消息;媒体接入控制控制元素MAC CE消息;用于时间同步的随机接入请求消息。
- 根据权利要求31至37中任一项所述的接入网设备,其特征在于,所述第一时间表示的是一个特定的帧、子帧、时隙slot、微时隙mini slot或者符号的边界的时间。
- 一种时间同步方法,其特征在于,所述方法包括:终端设备接收接入网设备发送的第一数值,所述第一数值用于指示第一时间;所述终端设备根据所述第一数值得到所述第一时间,所述第一时间的时间单元为n微秒或n纳秒或n飞秒或n毫秒,n大于0;当时间单元为n毫秒时,n小于10。
- 根据权利要求39所述的方法,其特征在于,所述终端设备根据所述第一数值得到所述第一时间,包括:所述终端设备接收接入网设备通过系统消息或单播消息或组播消息发送的第一指示信息,所述第一指示信息用于指示所述第一时间的时间单元;所述终端设备根据所述第一数值和所述第一时间的时间单元的乘积,得到所述第一时间。
- 根据权利要求39所述的方法,其特征在于,所述第一时间的时间单元为预设的时间单元;所述终端设备根据所述第一数值得到所述第一时间,包括:所述终端设备根据所述第一数值和所述预设的时间单元的乘积,得到所述第一时间。
- 根据权利要求39至41中任一项所述的方法,其特征在于,所述终端设备根据所述第一数值得到所述第一时间之后,还包括:所述终端设备通过广播或单播或组播的方式接收所述接入网设备发送的第二时间,所述第二时间的时间单元为10毫秒;所述终端设备将所述第一时间与第二时间相加得到第三时间。
- 根据权利要求39至42中任一项所述的方法,其特征在于,所述方法还包括:所述终端设备根据所述第一时间与预设时间之和得到第五时间,根据所述第五时间同步所述终端设备的时间。
- 根据权利要求39至43中任一项所述的方法,其特征在于,所述终端设备接收接入网设备发送的第一数值,包括:所述终端设备接收接入网设备发送的单播消息,所述单播消息中包括所述第一数值。
- 根据权利要求44所述的方法,其特征在于,所述单播消息中还包括第一系统帧号;所述终端设备接收接入网设备发送的单播消息之后,还包所述终端设备根据所述第一系统帧的帧号和第二系统帧的帧号得到第五时间对应的第一系统帧;所述第二系统帧为所述第一数值的系统帧。
- 根据权利要求45所述的方法,其特征在于,所述第五时间对应第一系统帧的帧头边界或帧尾边界;所述第一系统帧是距离所述第二系统帧最近的且帧号等于所述第一系统帧的帧号的系统帧;或者所述第一系统帧是在所述第二系统帧前面且距离所述第二系统帧最近的且帧号等于所述第一系统帧的帧号的系统帧;或者所述第一系统帧是在第二系统帧后面距离所述第二系统帧最近的且帧号等于所述第一系统帧的帧号的系统帧;或者当所述第一系统帧的帧号和所述第二系统帧的帧号相同时,所述第一系统帧是所述第二系统帧。
- 根据权利要求39至43中任一项所述的方法,其特征在于,所述终端设备接收接入网设备发送的第一数值,包括:所述终端设备接收网络设备发送的第一系统消息块,所述第一系统消息块中包括所述第一数值。
- 根据权利要求39所述的方法,其特征在于,所述第一数值包括多个参数的值,所述多个参数对应不同的时间单元;所述终端设备根据所述第一数值得到所述第一时间,包括:所述终端设备根据所述第一数值包括的多个参数的值得到所述第一时间。
- 根据根据权利要求39所述的方法,其特征在于,还包括:所述终端设备向所述接入网设备发送第一消息,所述第一消息用于请求所述接入网设备向所述终端设备发送第一数值。
- 一种时间同步方法,其特征在于,所述方法包括:接入网设备确定第一数值,所述第一数值用于指示第一时间,所述第一时间的时间单 元为n微秒或n纳秒或n飞秒或n毫秒,n大于0;当时间单元为n毫秒时,n小于10;所述接入网设备向终端设备发送第一数值。
- 根据权利要求50所述的方法,其特征在于,所述方法还包括:所述接入网设备通过系统消息或单播消息或组播消息向终端设备发送第一指示信息,所述第一指示信息用于指示所述第一时间的时间单元;所述第一时间是所述终端设备根据所述第一数值和所述第一时间的时间单元的乘积得到的。
- 根据权利要求50所述的方法,其特征在于,所述第一时间的时间单元为预设的时间单元,所述第一时间是所述终端设备根据第一数值和所述预设的时间单元的乘积得到的。
- 根据权利要求50-52中任一项所述的方法,其特征在于,所述接入网设备通过广播或单播或组播的方式向所述终端设备发送第二时间,所述第二时间的时间单元为10毫秒;第三时间是所述终端设备将所述第一时间与第二时间相加得到的。
- 根据权利要求52或53所述的方法,其特征在于,所述接入网设备向终端设备发送第一数值,包括:所述接入网设备向所述终端设备发送单播消息,所述单播消息中包括所述第一数值。
- 根据权利要求54所述的方法,其特征在于,所述单播消息中还包括第一系统帧号;第五时间对应的第一系统帧是所述终端设备根据所述第一系统帧的帧号和第二系统帧的帧号得到的;所述第二系统帧为所述终端设备接收到所述第一数值的系统帧。
- 根据权利要求55所述的方法,其特征在于,所述第五时间对应第一系统帧的帧头边界或帧尾边界;所述第一系统帧是距离所述第二系统帧最近的且帧号等于所述第一系统帧的帧号的系统帧;或者所述第一系统帧是在所述第二系统帧前面且距离所述第二系统帧最近的且帧号等于所述第一系统帧的帧号的系统帧;或者所述第一系统帧是在第二系统帧后面距离所述第二系统帧最近的且帧号等于所述第一系统帧的帧号的系统帧;或者当所述第一系统帧的帧号和所述第二系统帧的帧号相同时,所述第一系统帧是所述第二系统帧。
- 根据权利要求50或51所述的方法,其特征在于,所述接入网设备向终端设备发送第一数值,包括:所述接入网设备向所述终端设备发送第一系统消息块,所述第一系统消息块中包括所述第一数值。
- 根据权利要求50所述的方法,其特征在于,所述第一数值包括多个参数的值,所述多个参数对应不同的时间单元;所述第一时间是所述终端设备根据所述多个参数的值得到的。
- 根据权利要求50所述的方法,其特征在于,还包括:所述接入网设备接收所述终端设备发送的第一消息,所述第一消息用于请求所述接入 网设备向所述终端设备发送第一数值。
- 一种计算机可读存储介质,其特征在于,所述存储介质存储有指令,当所述指令在计算机上运行时,使得计算机实现执行上述1至19任一项或者39至59中任一项所述的时间同步方法。
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AU2018368222A1 (en) | 2020-06-11 |
CN111316719B (zh) | 2022-03-29 |
EP4216620A1 (en) | 2023-07-26 |
ES2941495T3 (es) | 2023-05-23 |
US11310757B2 (en) | 2022-04-19 |
CA3082719A1 (en) | 2019-05-23 |
WO2019095241A1 (zh) | 2019-05-23 |
CN111316719A (zh) | 2020-06-19 |
EP3703437A1 (en) | 2020-09-02 |
US20200280943A1 (en) | 2020-09-03 |
CA3082719C (en) | 2023-02-28 |
AU2018368222B2 (en) | 2021-06-24 |
KR20200083591A (ko) | 2020-07-08 |
EP3703437A4 (en) | 2020-12-23 |
KR102341070B1 (ko) | 2021-12-20 |
EP3703437B1 (en) | 2023-01-11 |
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