CN115087086B

CN115087086B - Timing synchronization method, apparatus, base station, terminal, storage medium, and program product

Info

Publication number: CN115087086B
Application number: CN202110264717.7A
Authority: CN
Inventors: 谌丽
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2021-03-11
Filing date: 2021-03-11
Publication date: 2024-07-05
Anticipated expiration: 2041-03-11
Also published as: CN115087086A

Abstract

The application provides a timing synchronization method, a timing synchronization device, a base station, a terminal, a storage medium and a program product. The timing synchronization method comprises the following steps: when the terminal changes the cell, the source base station sends delay compensation information of the terminal to the target base station so as to instruct the target base station to determine a delay compensation strategy for the terminal according to the delay compensation information. Thus, the timing synchronization between the terminal and the base station in the scene that the terminal changes the cell is realized.

Description

Timing synchronization method, apparatus, base station, terminal, storage medium, and program product

Technical Field

The present application relates to the field of communications technologies, and in particular, to a timing synchronization method, apparatus, base station, terminal, storage medium, and program product.

Background

In the third Generation partnership project (3rd Generation Partnership Project,3GPP), a Network deployment mechanism of a fifth Generation mobile communication technology (5 th-Generation, 5G) system access time-sensitive Network (TIME SENSITIVE Network, TSN) is introduced to realize the support of the industrial internet of things (Industrial Internet of Things, IIOT) scenario.

TSN networks have extremely high clock synchronization requirements, which are equally applicable to the scenario where a 5G system accesses the TSN network. To cope with the clock synchronization requirement, the base station side or the terminal side may perform propagation delay compensation (Propagation Delay Compensation, PDC). For example, the base station performs synchronization adjustment by itself according to the timing error estimation to the terminal, that is, the base station performs time synchronization with the terminal as a reference; or the terminal performs delay compensation according to the timing reference time notified by the base station.

However, when the terminal changes the cell, if the source base station performs propagation delay compensation on the base station side and the terminal does not perform compensation, the timing synchronization error of the target base station and the terminal may exceed the allowable error range; or if the terminal performs propagation delay compensation for the source base station, the target base station performs propagation delay compensation on the base station side, and instead, the timing synchronization error is increased.

Disclosure of Invention

The application provides a timing synchronization method, a timing synchronization device, a base station, a terminal, a storage medium and a program product, which realize timing synchronization between the terminal and the base station when the terminal changes cells.

In a first aspect, the present application provides a timing synchronization method, including:

the source base station determines a terminal change cell;

and the source base station sends delay compensation information of the terminal to the target base station, wherein the delay compensation information is used for determining delay compensation of the terminal.

In one embodiment, the delay compensation information includes at least one of: the method comprises a delay compensation execution body, a delay compensation amount, a delay compensation method, delay compensation precision or a delay compensation scene.

In one embodiment, the source base station determines that the terminal changes cells, including: and the source base station determines that the terminal performs cell switching, or the source base station determines that the terminal performs primary cell change.

In one embodiment, the method further comprises: the source base station determines that a source cell and a target cell respectively belong to different concentration units CU when the terminal changes the cell;

the source base station sends the delay compensation information of the terminal to a target base station, and the delay compensation information comprises the following steps:

and the CU of the source base station sends the time delay compensation information to the CU of the target base station through an Xn interface.

In one embodiment, the delay compensation information is carried in a handover request message or a first other message sent by the CU of the source base station to the CU of the target base station through an Xn interface, where the first other message is sent by the CU of the source base station after receiving a confirmation message of the CU of the target base station to the handover request.

In one embodiment, the method further comprises: the source base station determines that a source cell and a target cell belong to different distribution units DU of the same centralized unit CU when the terminal changes the cells;

And the CU sends the time delay compensation information to the DU to which the target cell belongs through an F1 interface.

In one embodiment, the delay compensation information is carried in a terminal context establishment request message or a second other message sent by the CU to a DU to which the cell after the terminal change belongs through an F1 interface, where the second other message is sent after the CU receives a response message to the terminal context establishment by the DU to which the cell after the terminal change belongs.

In one embodiment, the source base station determines that the terminal changes cells, including: and the source base station determines that the terminal is an inactive state terminal and the terminal performs cell reselection.

In an embodiment, the delay compensation information is carried in an acquiring terminal context response message or a third other message sent by the source base station to the target base station, where the acquiring terminal context response message is sent by the source base station after receiving the acquiring terminal context request message sent by the target base station, and the third other message is sent by the source base station after sending the acquiring terminal context response message.

In a second aspect, the present application provides a timing synchronization method, including:

The target base station receives the delay compensation information of the terminal sent by the source base station;

and the target base station determines the delay compensation of the terminal according to the delay compensation information.

In one embodiment, the determining, by the target base station, the delay compensation of the terminal according to the delay compensation information includes:

And the target base station determines a delay compensation execution main body of the terminal according to the delay compensation information.

In one embodiment, the determining, by the target base station, a delay compensation execution body of the terminal according to the delay compensation information includes:

and the target base station determines the delay compensation execution subject of the terminal as the target base station according to the delay compensation information, and determines the delay compensation quantity.

In one embodiment, the method further comprises:

the target base station sends a first delay compensation notice to the terminal, wherein the first delay compensation notice is used for indicating a delay compensation execution main body of the terminal to be the target base station.

the target base station determines a delay compensation execution main body of the terminal as the terminal according to the delay compensation information, and sends a second delay compensation notification to the terminal, wherein the second delay compensation notification is used for indicating the delay compensation execution main body of the terminal as the terminal.

In one embodiment, the method further comprises:

And the target base station transmits timing reference information of the target base station to the terminal, wherein the timing reference information is used for determining the delay compensation quantity of the terminal.

In a third aspect, the present application provides a timing synchronization method, including:

The terminal changes the cell;

The terminal receives a delay compensation notice sent by a target base station, wherein the delay compensation notice is used for indicating a delay compensation execution main body of the terminal.

In one embodiment, the terminal changes cells, including:

The terminal performs cell switching;

Or the terminal changes the main cell;

or, the terminal is an inactive state terminal and performs cell reselection.

In one embodiment, the receiving, by the terminal, a delay compensation notification sent by a target base station includes:

the terminal receives a first delay compensation notice sent by the target base station, wherein the first delay compensation notice is used for indicating a delay compensation execution main body of the terminal to be the target base station.

The terminal receives a second delay compensation notification sent by the target base station, wherein the second delay compensation notification is used for indicating a delay compensation execution main body of the terminal to be the terminal.

In one embodiment, the method further comprises:

The terminal receives timing reference information sent by the target base station, wherein the timing reference information is used for determining the delay compensation quantity of the terminal.

In a fourth aspect, the present application provides a timing synchronization apparatus comprising:

a processing unit, configured to determine a terminal change cell;

and the sending unit is used for sending the delay compensation information of the terminal to the target base station, wherein the delay compensation information is used for determining the delay compensation of the terminal.

In one embodiment, the processing unit is configured to determine that the terminal performs cell handover, or determine that the terminal performs primary cell change.

In an embodiment, the processing unit is further configured to determine that the source cell and the target cell when the terminal changes cells respectively belong to different concentration units CU, and the sending unit is configured to:

and sending the delay compensation information to the CU of the target base station through an Xn interface.

In one embodiment, the delay compensation information is carried in a handover request message or a first other message sent by the sending unit to the CU of the target base station through an Xn interface, where the first other message is sent by the sending unit after receiving a confirmation message of the CU of the target base station for the handover request.

In an embodiment, the processing unit is further configured to, when determining that the source cell and the target cell when the terminal changes cells belong to different distribution units DU of the same centralized unit CU, the sending unit is configured to:

And sending the delay compensation information to the DU to which the target cell belongs through an F1 interface.

In one embodiment, the delay compensation information is carried in a terminal context establishment request message or a second other message sent by the sending unit to the DU to which the cell after the terminal is changed belongs through an F1 interface, where the second other message is sent by the sending unit after receiving a response message of the DU to which the cell after the terminal is changed to the terminal context establishment response message.

In one embodiment, the processing unit is further configured to determine that the terminal is an inactive state terminal and the terminal performs cell reselection.

In one embodiment, the delay compensation information is carried in an acquiring terminal context response message or a third other message sent by the sending unit to the target base station, where the acquiring terminal context response message is sent by the sending unit after receiving the acquiring terminal context request message sent by the target base station, and the third other message is sent by the sending unit after sending the acquiring terminal context response message.

In a fifth aspect, the present application provides a timing synchronization apparatus comprising:

the receiving unit is used for receiving the delay compensation information of the terminal sent by the source base station;

And the processing unit is used for determining the delay compensation of the terminal according to the delay compensation information.

In one embodiment, the processing unit is configured to:

And determining a delay compensation execution main body of the terminal according to the delay compensation information.

In one embodiment, the processing unit is configured to:

and determining a delay compensation execution main body of the terminal as the timing synchronization device according to the delay compensation information, and determining a delay compensation amount.

In one embodiment, the timing synchronization device further includes:

and the first sending unit is used for sending a first delay compensation notice to the terminal, wherein the first delay compensation notice is used for indicating a delay compensation execution main body of the terminal to be the timing synchronization device.

In one embodiment, the processing unit is configured to:

And determining the delay compensation execution main body of the terminal as the terminal according to the delay compensation information, and sending a second delay compensation notice to the terminal, wherein the second delay compensation notice is used for indicating the delay compensation execution main body of the terminal as the terminal.

In one embodiment, the timing synchronization device further includes:

And the second sending unit is used for sending timing reference information of the timing synchronization device to the terminal, wherein the timing reference information is used for determining the delay compensation quantity of the terminal.

In a sixth aspect, the present application provides a timing synchronization apparatus comprising:

A processing unit for changing the cell;

And the receiving unit is used for receiving the delay compensation notice sent by the target base station, and the delay compensation notice is used for indicating a delay compensation execution main body of the terminal.

In one embodiment, the processing unit is configured to:

cell switching is carried out; or, performing primary cell change; or determining the terminal to be an inactive state terminal and performing cell reselection.

In one embodiment, the receiving unit is configured to:

And receiving a first delay compensation notice sent by the target base station, wherein the first delay compensation notice is used for indicating a delay compensation execution main body of the terminal to be the target base station.

In one embodiment, the receiving unit is configured to:

And receiving a second delay compensation notice sent by the target base station, wherein the second delay compensation notice is used for indicating a delay compensation execution main body of the terminal to be the terminal.

In one embodiment, the receiving unit is further configured to:

And receiving timing reference information sent by the target base station, wherein the timing reference information is used for determining the delay compensation quantity of the terminal.

In a seventh aspect, the present application provides a base station comprising a memory, a transceiver, and a processor:

The memory is used for storing a computer program; the transceiver is used for receiving and transmitting data under the control of the processor; the processor is configured to read a computer program in the memory and perform the method of the first aspect, any implementation of the first aspect, the second aspect or any implementation of the second aspect.

In an eighth aspect, the present application provides a terminal comprising a memory, a transceiver, and a processor:

The memory is used for storing a computer program; the transceiver is used for receiving and transmitting data under the control of the processor; the processor is configured to read the computer program in the memory and perform the method according to any implementation of the third aspect or the third aspect.

In a ninth aspect, the present application provides a processor-readable storage medium storing a computer program for causing the processor to perform the method of the first aspect, any implementation of the first aspect, the second aspect, any implementation of the second aspect, the third aspect, and any implementation of the third aspect.

In a tenth aspect, the present application provides a computer program product comprising a computer program which when executed by a processor implements the method of the first aspect, any implementation of the first aspect, the second aspect, any implementation of the second aspect, the third aspect and any implementation of the third aspect.

According to the timing synchronization method, the device, the base station, the terminal, the storage medium and the program product, when the terminal changes the cell, the source base station informs the target base station of the delay compensation information of the terminal before the cell is changed, so that the target base station can determine the delay compensation strategy after the cell is changed based on the delay compensation information, the terminal and the target base station are prevented from repeatedly performing delay compensation, or the terminal and the target base station do not perform delay compensation, and the timing synchronization between the terminal and the base station under the scene of the cell change of the terminal is realized.

It should be understood that the description of the invention above is not intended to limit key or critical features of embodiments of the invention, nor to limit the scope of the invention. Other features of the present invention will become apparent from the description that follows.

Drawings

In order to more clearly illustrate the application or the technical solutions of the prior art, the following description of the embodiments or the drawings used in the description of the prior art will be given in brief, it being obvious that the drawings in the description below are some embodiments of the application and that other drawings can be obtained from them without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of a 5G system access TSN network architecture according to an embodiment of the present application;

fig. 2 is a schematic flow chart of a timing synchronization method according to an embodiment of the present application;

FIG. 3 is a second schematic flowchart of a timing synchronization method according to an embodiment of the present application;

fig. 4 is a schematic flow chart III of a timing synchronization method according to an embodiment of the present application;

Fig. 5 is a schematic flow chart of a timing synchronization method according to an embodiment of the present application;

Fig. 6 is a schematic structural diagram of a timing synchronization device according to an embodiment of the present application;

Fig. 7 is a schematic structural diagram of a timing synchronization device according to an embodiment of the present application;

fig. 8 is a schematic structural diagram III of a timing synchronization device according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a base station according to an embodiment of the present application;

Fig. 10 is a schematic structural diagram of the terminal of fig. 8 according to an embodiment of the present application.

Detailed Description

The term "and/or" in the present application describes an association relationship of association objects, which means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship. The term "plurality" in embodiments of the present application means two or more, and other adjectives are similar.

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

The embodiment of the application provides a timing synchronization method and a timing synchronization device, which are used for realizing timing synchronization between a terminal and a base station under the condition that the terminal changes a cell. The method and the device are based on the same application, and because the principles of solving the problems by the method and the device are similar, the embodiments of the device and the method can be referred to each other, and the repetition is omitted.

The technical scheme provided by the embodiment of the application can be suitable for various systems, in particular to a 5G system. For example, applicable systems may be global system for mobile communications (global system of mobile communication, GSM), code division multiple access (code division multiple access, CDMA), wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) universal packet Radio service (GENERAL PACKET Radio service, GPRS), long term evolution (long term evolution, LTE), LTE frequency division duplex (frequency division duplex, FDD), LTE time division duplex (time division duplex, TDD), long term evolution-advanced (long term evolution advanced, LTE-a), universal mobile system (universal mobile telecommunication system, UMTS), worldwide interoperability for microwave access (worldwide interoperability for microwave access, wiMAX), 5G New air interface (New Radio, NR) systems, and the like. Terminal devices and network devices are included in these various systems. Core network parts such as evolved packet system (Evloved PACKET SYSTEM, EPS), 5G system (5 GS), etc. may also be included in the system.

The terminal device according to the embodiment of the present application may be a device that provides voice and/or data connectivity to a user, a handheld device with a wireless connection function, or other processing devices connected to a wireless modem, etc. The names of the terminal devices may also be different in different systems, for example in a 5G system, the terminal devices may be referred to as User Equipment (UE). The wireless terminal device may communicate with one or more Core Networks (CNs) via a radio access Network (Radio Access Network, RAN), which may be mobile terminal devices such as mobile phones (or "cellular" phones) and computers with mobile terminal devices, e.g., portable, pocket, hand-held, computer-built-in or vehicle-mounted mobile devices that exchange voice and/or data with the radio access Network. Such as Personal communication services (Personal Communication Service, PCS) phones, cordless phones, session initiation protocol (Session Initiated Protocol, SIP) phones, wireless local loop (Wireless Local Loop, WLL) stations, personal digital assistants (Personal DIGITAL ASSISTANT, PDA) and the like. The wireless terminal device may also be referred to as a system, subscriber unit (subscriber unit), subscriber station (subscriber station), mobile station (mobile station), remote station (remote station), access point (access point), remote terminal device (remote terminal), access terminal device (ACCESS TERMINAL), user terminal device (user terminal), user agent (user agent), user equipment (user device), and embodiments of the present application are not limited.

The base station according to the embodiment of the application can comprise a plurality of cells for providing services for the terminal. A base station may also be called an access point or may be a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminal devices, or other names, depending on the particular application. For example, the base station according to the embodiment of the present application may be an evolved network device (evolutional Node B, eNB or e-NodeB) in a long term evolution (long term evolution, LTE) system, a 5G base station (gNB) in a 5G network architecture (next generation system), or a home evolved base station (Home evolved Node B, heNB), a relay node (relay node), a home base station (femto), a pico base station (pico), or the like, which is not limited in the embodiment of the present application. In some network structures, a base station may include a centralized unit (centralized unit, CU) node and a Distributed Unit (DU) node, which may also be geographically separated.

Multiple-input Multiple-output (Multi Input Multi Output, MIMO) transmissions may each be made between the base station and the terminal device using one or more antennas, and the MIMO transmissions may be Single User MIMO (SU-MIMO) or Multiple User MIMO (MU-MIMO). The MIMO transmission may be 2D-MIMO, 3D-MIMO, FD-MIMO, or massive-MIMO, or may be diversity transmission, precoding transmission, beamforming transmission, or the like, depending on the form and number of the root antenna combinations.

The timing synchronization method provided by the embodiment of the application is used for realizing timing synchronization between the terminal and the base station, and can be applied to a scene that a 5G system accesses a TSN network, for example, as shown in figure 1, the 5G system accesses the TSN network through a converter in a bridging mode. Table 1 is an example clock synchronization performance requirement, and as can be seen from table 1, the requirement for clock synchronization is below 1us in some scenarios.

TABLE 1

However, in the wireless network, there are some factors that cause synchronization errors, such as the base station and the terminal have clock crystal oscillator offset, and there are synchronization errors caused by propagation delay in the wireless transmission process, so in order to meet the clock synchronization performance requirement, the base station side or the terminal side can perform propagation delay compensation. For example, the base station performs synchronization adjustment by itself according to the timing error estimation to the terminal, that is, the base station performs time synchronization with the terminal as a reference; or the terminal performs delay compensation according to the timing reference time notified by the base station. The base station side and the terminal side cannot perform delay compensation at the same time, otherwise, accumulated errors occur.

When a terminal changes a cell, as a source base station to which a cell before the change belongs and a target base station to which a cell after the change belongs are involved, if delay compensation of a base station side is performed by the source base station and the terminal does not perform compensation, a timing synchronization error of the target base station and the terminal may exceed an allowable error range; or if the terminal has performed delay compensation for the source base station, the target base station performs delay compensation on the base station side, but increases timing synchronization error.

In order to ensure that the terminal and the base station can keep synchronous when the terminal changes the cell, the embodiment of the application provides a timing synchronization method, and when the terminal changes the cell, the source base station informs the target base station of the delay compensation information of the terminal before the cell is changed, so that the target base station can determine the delay compensation strategy after the cell is changed based on the delay compensation information, thereby avoiding that the terminal and the target base station repeatedly perform delay compensation or the terminal and the target base station do not perform delay compensation, and the timing synchronization error is increased.

The timing synchronization method provided by the present application will be described in detail by way of specific examples. It is to be understood that the following embodiments may be combined with each other and that some embodiments may not be repeated for the same or similar concepts or processes.

Example 1

Fig. 2 is a schematic flowchart of a timing synchronization method according to an embodiment of the present application. As shown in fig. 2, the method includes:

S201, the source base station determines a terminal change cell.

In the embodiment of the present application, the scene of changing the cell by the terminal may be any scene of changing the cell from one cell to another cell by the terminal, for example, the terminal performs cell switching, the terminal performs primary cell changing (PCELL CHANGE), or the inactive terminal (inactive UE) performs cell reselection. The specific flow of changing the cell by the terminal in the embodiment of the present application is not described in detail, and reference may be made to the flow of changing the cell by the terminal in the related art. And the source base station can execute the subsequent steps under the condition of determining that the terminal changes the cell.

S202, the source base station sends delay compensation information of the terminal to the target base station.

In the embodiment of the present application, a cell before modification may be referred to as a source cell, and a cell after modification may be referred to as a target cell. The source base station refers to a base station to which the source cell belongs, and the target base station refers to a base station to which the target cell belongs. The source base station and the target base station may refer to access network entities having the same CU, different DUs.

The delay compensation information is delay compensation information between the terminal and the source base station, and may include at least one of the following: the method comprises a delay compensation execution body, a delay compensation amount, a delay compensation method, delay compensation precision or a delay compensation scene.

The delay compensation execution body may be a base station, and is used for indicating that delay compensation between the terminal and the source base station is executed by the source base station side; or the delay compensation execution body may be a terminal for indicating that delay compensation between the terminal and the source base station is executed by the terminal side.

The delay compensation amount may be an amount of time adjusted for the terminal relative to a reference time of the source base station when the source base station performs delay compensation; or the delay compensation amount may be a timing deviation of the terminal with respect to a reference time of the source base station when the delay compensation is performed by the terminal. Alternatively, the amount of delay compensation may be an absolute time value, e.g., expressed in nanoseconds (ns), or slot (slot) offsets, etc.

The delay compensation method refers to employing delay compensation based on arrival time (TA based) or based on round trip time (RTT based).

A time delay compensation scene, which represents a scene aimed by a terminal performing time delay compensation, for example, synchronizing with a network side or synchronizing with other terminals in a TSN network; as another example, a scenario as illustrated in table 1 or other scenario is also possible. Optionally, the delay compensation scene may have a corresponding scene number, and the delay compensation information may carry the number corresponding to the delay compensation scene.

S203, the target base station determines the delay compensation of the terminal according to the delay compensation information.

After receiving the delay compensation information of the terminal sent by the source base station, the target base station determines delay compensation of the terminal according to the delay compensation information, namely, how to perform delay compensation between the target base station and the terminal. For example, the target base station determines that the delay compensation execution subject of the terminal is the target base station or the terminal. Optionally, the target base station may send a delay compensation notification to the terminal after determining the delay compensation execution body of the terminal, so as to indicate the delay compensation execution body to the terminal, thereby avoiding that the target base station and the terminal perform delay compensation or do not perform delay compensation. The target base station may also determine a delay compensation mode, a delay compensation amount, and the like of the terminal.

It should be noted that, no matter whether the delay compensation execution body in the delay compensation information sent by the source base station is a base station or a terminal, the target base station may determine that the delay compensation execution body is the target base station, or may determine that the delay compensation execution body is the terminal.

Optionally, the target base station determines the delay compensation execution subject of the terminal as the target base station according to the delay compensation information, and determines the delay compensation amount. For example, when the target base station determines that the delay compensation execution body is the target base station, the delay compensation amount of the target base station to the terminal may be determined according to the delay compensation amount and/or the delay compensation scenario of the source base station.

In an example, the delay compensation execution body in delay compensation information of the source base station to the terminal is a base station, and the target base station determines that the delay compensation execution body of the terminal is the target base station according to the delay compensation information, and determines a delay compensation amount, so that delay compensation is performed at the side of the target base station.

In an example, the delay compensation execution body in delay compensation information of the source base station to the terminal is the terminal, and after the target base station determines that the delay compensation execution body is the target base station, the target base station may send a first delay compensation notification to the terminal, where the first delay compensation notification is used to instruct the delay compensation execution body of the terminal to be the target base station, so that the terminal side does not need to perform delay compensation any more.

Optionally, the target base station determines the delay compensation execution subject of the terminal as the terminal according to the delay compensation information, and sends a second delay compensation notification to the terminal, where the second delay compensation notification is used to instruct the terminal to perform delay compensation.

In an example, the delay compensation execution body in the delay compensation information of the source base station to the terminal is a base station, and after the target base station determines that the delay compensation execution body is the terminal, the target base station sends a delay second delay compensation notification to the terminal, so that delay compensation is performed at the terminal side.

In an example, the delay compensation execution body in the delay compensation information of the source base station to the terminal is the terminal, and the target base station sends a delay second delay compensation notification to the terminal after determining that the delay compensation execution body is the terminal, so that delay compensation is performed at the terminal side.

The first delay compensation notification or the second delay compensation notification sent by the target base station to the terminal may be carried in a signaling sent by the target base station to the terminal during or after the terminal changes the cell, which is not limited in the embodiment of the present application.

In some embodiments, the source base station and the target base station are synchronous, or the synchronous error between the source base station and the target base station is within a determined controllable range, and when the target base station determines that the terminal side performs delay compensation, the terminal can determine the delay compensation amount according to the timing reference information of the source base station so as to perform delay compensation.

Optionally, after determining that the delay compensation execution body is the terminal, the target base station may further send timing reference information of the target base station to the terminal, where the timing reference information is used to instruct the terminal to determine the delay compensation amount according to the timing reference information, so as to implement delay compensation on the terminal side.

According to the timing synchronization method provided by the embodiment of the application, when the terminal changes the cell, the source base station informs the target base station of the delay compensation information of the terminal before the cell is changed, so that the target base station can determine the delay compensation strategy after the cell is changed based on the delay compensation information, the terminal and the target base station are prevented from repeatedly performing delay compensation, or the terminal and the target base station do not perform delay compensation, and the timing synchronization between the terminal and the base station under the scene of the terminal changing the cell is realized.

The following describes, with reference to a specific embodiment, the delay compensation information sent by the source base station to the target base station in S202, for different situations when the terminal changes the cell.

Example two

When a terminal performs cell switching or a terminal performs primary cell change, if a source cell and a target cell respectively belong to different CUs, that is, the source cell belongs to a CU of a source base station, the target cell belongs to a CU of a target base station, and the source base station and the target base station are different, in this case, delay compensation information can be interacted between the source base station and the target base station through an Xn interface, and the source base station sends the delay compensation information of the terminal to the target base station in S202, which includes: and the CU of the source base station sends delay compensation information to the CU of the target base station through the Xn interface.

As shown in fig. 3, when the terminal changes the cell, the CU of the source base station transmits a HANDOVER REQUEST (HANDOVER REQUEST) message to the target base station through the Xn interface, and if the CU of the target base station can accept the terminal to be handed over after receiving the HANDOVER REQUEST message transmitted by the source base station, the CU of the target base station transmits a HANDOVER REQUEST acknowledgement (HANDOVER REQUEST ACKNOWLEDGE) message to the CU of the source base station. After receiving the handover request acknowledgement message sent by the CU of the target base station, the CU of the source base station may also send a first other message to the CU of the target base station (Other Information). The delay compensation information may be carried in a handover request message or a first other message sent by the CU of the source base station to the CU of the target base station through the Xn interface.

The method of the embodiment realizes the timing synchronization between the terminal and the base station when the terminal changes the cells among different base stations, and avoids the timing synchronization error caused by the change of the cells by the terminal.

Example III

When a terminal performs cell switching or a terminal performs primary cell change, if a source cell and a target cell belong to different DUs of the same CU, that is, the source cell and the target cell belong to the CU of the same base station but belong to different DUs of the CU, in this case, the source base station and the target base station stated in the embodiment of the present application are both the same base station, and the terminal changes cells between different DUs in the same base station, then in the embodiment of the present application, the interaction time delay compensation information between the source base station and the target base station actually refers to interaction time delay compensation information in one base station. In S202, the source base station sends delay compensation information of the terminal to the target base station, including: and the CU which the source cell and the target cell belong to sends delay compensation information to the DU which the target cell belongs to through the F1 interface.

As shown in fig. 4, in the case of the above-mentioned terminal change cell, when the terminal changes cells, the CUs of the base station to which the source cell and the target cell belong will send a terminal context establishment request (UE CONTEXT SETUP REQUEST) message to the DU to which the target cell belongs through the F1 interface, and after receiving the terminal context establishment request message sent by the CU, the DU to which the target cell belongs, if the terminal to be switched can be accepted, send a terminal context establishment response (UE CONTEXT SETUP RESPONSE) message to the CU. After receiving the terminal context establishment response message sent by the DU to which the target cell belongs, the CU may send a second other message to the DU to which the target cell belongs (Other Information). The delay compensation information may be carried in a terminal context establishment request message or a second other message sent by the CU to the DU to which the target cell belongs through the F1 interface.

The method of the embodiment realizes the timing synchronization between the terminal and the base station when the terminal changes the cells between the same base stations, and avoids the timing synchronization error caused by the change of the cells by the terminal.

Example IV

In the inactive state, the terminal does not establish a radio resource control (Radio Resource Control, RRC) connection with any cell, but the terminal can still perform small data transmission, and in the process of performing small data transmission, the base station to which the cell performing small data transmission belongs needs to be synchronized with the terminal. When the inactive state terminal performs cell reselection, another cell may be reselected to perform small data transmission, and clock synchronization with a new base station to which the new cell belongs is required. At this time, the new base station to which the new cell belongs needs to acquire the terminal context from the old base station. In this case, the source base station in the embodiment of the present application is an old base station that maintains the context of the terminal, and the target base station is a new base station to which a new cell newly selected by the terminal to continue small data transmission belongs.

As shown in fig. 5, in the case of the above-mentioned cell change scenario, the target base station may send a request (RETRIEVE UE CONTEXT REQUEST) for acquiring a terminal context to the source base station, and after receiving the request message for acquiring a terminal context sent by the target base station, the source base station sends a response (RETRIEVE UE CONTEXT RESPONSE) for acquiring a terminal context to the target base station. Thereafter, the source base station may also continue to send a third further message to the target base station (Other Information). And the delay compensation information may be carried in an acquisition terminal context response message or a third other message sent by the source base station to the target base station.

The method of the embodiment realizes the timing synchronization between the terminal and the base station when the inactive state terminal performs cell reselection, and avoids the timing synchronization error caused by the change of the cell by the terminal.

Fig. 6 is a schematic structural diagram of a timing synchronization device according to an embodiment of the present application. As shown in fig. 6, the timing synchronization apparatus 600 includes:

a processing unit 601 is configured to determine a terminal change cell.

And a transmitting unit 602, configured to transmit delay compensation information of the terminal to the target base station when the terminal changes the cell, where the delay compensation information is used to determine delay compensation of the terminal.

In one embodiment, the processing unit 601 is configured to: and determining that the terminal performs cell switching or determining that the terminal performs primary cell change.

In one embodiment, the processing unit 601 is configured to determine that the source cell and the target cell respectively belong to different concentration units CU when the terminal changes cells; the sending unit 602 is configured to send delay compensation information to a CU of the target base station through the Xn interface.

In one embodiment, the delay compensation information is carried in a handover request message or a first other message sent by the sending unit 602 to the CU of the target base station through the Xn interface, where the first other message is sent by the sending unit 602 after receiving the CU of the target base station.

In one embodiment, the processing unit 601 is configured to determine that the source cell and the target cell belong to different distribution units DU of the same central unit CU when the terminal changes cells; the transmitting unit 602 is configured to transmit delay compensation information to a DU to which the target cell belongs through an F1 interface.

In one embodiment, the delay compensation information is carried in a terminal context establishment request message or a second other message sent by the sending unit 602 through the F1 interface to the DU to which the cell after the terminal change belongs, where the second other message is sent by the sending unit 602 after receiving the response message of the DU to which the cell after the terminal change belongs to the terminal context establishment response message.

In one embodiment, the processing unit 601 is configured to determine that the terminal is an inactive state terminal and the terminal performs cell reselection.

In one embodiment, the delay compensation information is carried in an acquiring terminal context response message or a third other message sent by the sending unit 602 to the target base station, where the acquiring terminal context response message is sent by the sending unit 602 after receiving the acquiring terminal context request message sent by the target base station, and the third other message is sent by the sending unit 602 after sending the acquiring terminal context response message.

It should be noted that, the above device provided by the present application can implement all the method steps implemented by the source base station in the method embodiment, and can achieve the same technical effects, and the same parts and beneficial effects as those of the method embodiment in the present embodiment are not described in detail herein.

Fig. 7 is a schematic structural diagram of a timing synchronization device according to an embodiment of the present application. As shown in fig. 7, the timing synchronization apparatus 700 includes:

And the receiving unit 701 is configured to receive delay compensation information of a terminal sent by the source base station.

And the processing unit 702 is configured to determine delay compensation of the terminal according to the delay compensation information.

In one embodiment, the processing unit 702 is configured to:

Determining a delay compensation execution body of a terminal according to delay compensation information

In one embodiment, the processing unit 702 is configured to:

The delay compensation execution subject of the terminal is determined as the timing synchronization device 700 according to the delay compensation information, and the delay compensation amount is determined.

In one embodiment, the timing synchronization apparatus 700 further includes:

And a first transmitting unit, configured to transmit a first delay compensation notification to the terminal, where the first delay compensation notification is used to instruct the delay compensation execution body of the terminal to be the timing synchronization device 700.

In one embodiment, the processing unit 702 is configured to:

In one embodiment, the timing synchronization apparatus 700 further includes:

A second transmitting unit, configured to transmit timing reference information of the timing synchronization apparatus 700 to the terminal, where the timing reference information is used to determine a delay compensation amount of the terminal.

It should be noted that, the above device provided by the present application can implement all the method steps implemented by the target base station in the method embodiment, and can achieve the same technical effects, and the same parts and beneficial effects as those of the method embodiment in the present embodiment are not described in detail herein.

Fig. 8 is a schematic diagram of a timing synchronization device according to an embodiment of the present application. As shown in fig. 8, the timing synchronization apparatus 800 includes:

A processing unit 801, configured to change a cell.

And a receiving unit 802, configured to receive a delay compensation notification sent by the target base station, where the delay compensation notification is used to instruct a delay compensation execution body of the terminal.

In one embodiment, the processing unit 801 is configured to:

cell switching is carried out; or, performing primary cell change; or determining that the terminal is an inactive state terminal and performing cell reselection.

In one embodiment, the receiving unit 802 is configured to:

In one embodiment, the receiving unit 802 is further configured to:

It should be noted that, the device provided by the present application can implement all the method steps implemented by the terminal in the method embodiment, and can achieve the same technical effects, and the same parts and beneficial effects as those of the method embodiment in the embodiment are not described in detail herein.

It should be noted that, in the embodiment of the present application, the division of the units is schematic, which is merely a logic function division, and other division manners may be implemented in actual practice. In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units described above, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a processor-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

Fig. 9 is a schematic structural diagram of a base station according to an embodiment of the present application. As shown in fig. 9, the base station 900 includes a memory 901, a transceiver 902, and a processor 903.

A memory 901 for storing a computer program; a transceiver 902 for transceiving data under the control of the processor 903; a processor 903 for reading the computer program in the memory 901 and performing the method performed by the source base station or the target base station in the above embodiment.

Where in FIG. 9, a bus architecture may comprise any number of interconnected buses and bridges, with one or more processors, represented in particular by processor 903, and various circuits of memory, represented by memory 901, linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. The transceiver 902 may be a number of elements, including a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium, including wireless channels, wired channels, optical cables, etc. The processor 903 is responsible for managing the bus architecture and general processing, and the memory 901 may store data used by the processor 903 in performing operations.

The processor 903 may be a Central Processing Unit (CPU), an Application SPECIFIC INTEGRATED Circuit (ASIC), a Field-Programmable gate array (Field-Programmable GATE ARRAY, FPGA), or a complex Programmable logic device (Complex Programmable Logic Device, CPLD), or may employ a multi-core architecture.

It should be noted that, the above device provided by the present application can implement all the method steps implemented by the source base station or the target base station in the method embodiment, and can achieve the same technical effects, and detailed descriptions of the same parts and beneficial effects as those of the method embodiment in the present embodiment are omitted.

Fig. 10 is a schematic structural diagram of a terminal according to an embodiment of the present application. As shown in fig. 10, terminal 1000 includes memory 1001, transceiver 1002, and processor 1003.

A memory 1001 for storing a computer program; a transceiver 1002 for transceiving data under the control of the processor 1003; a processor 1003 for reading the computer program in the memory 1001 and executing the method performed by the terminal in the above embodiment. Optionally, terminal 1000 can further include a user interface 1004.

Where in FIG. 10, a bus architecture may be comprised of any number of interconnected buses and bridges, one or more processors, represented in particular by processor 1003, and various circuits of the memory, represented by memory 1001. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. The transceiver 1002 may be a number of elements, i.e., including a transmitter and a receiver, providing a means for communicating with various other apparatus over transmission media, including wireless channels, wired channels, optical cables, etc. The user interface 1004 may also be an interface capable of interfacing with an inscribed desired device for a different user device, including but not limited to a keypad, display, speaker, microphone, joystick, etc.

The processor 1003 is responsible for managing the bus architecture and general processing, and the memory 1001 may store data used by the processor 1003 in performing operations.

Alternatively, the processor 1003 may be CPU, ASIC, FPGA or a CPLD, and the processor may also employ a multi-core architecture.

The processor is operable to perform any of the methods provided by embodiments of the present application in accordance with the obtained executable instructions by invoking a computer program stored in a memory. The processor and the memory may also be physically separate.

The embodiment of the application also provides a processor readable storage medium, and the processor readable storage medium stores a computer program, and the computer program is used for enabling a processor to execute the method executed by the source base station, the target base station or the terminal in the method embodiment.

The processor-readable storage medium may be any available medium or data storage device that can be accessed by a processor including, but not limited to, magnetic memory (e.g., floppy disk, hard disk, magnetic tape, magneto-optical disk (MO), etc.), optical memory (e.g., CD, DVD, BD, HVD, etc.), and semiconductor memory (e.g., ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid State Disk (SSD)), etc.

The embodiment of the application also provides a computer program product, which comprises a computer program, and the computer program is executed by a processor to realize the method executed by the source base station, the target base station or the terminal in the method embodiment.

It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, magnetic disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the processor-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims

1. A method of timing synchronization, comprising:

the source base station determines a terminal change cell;

The source base station sends delay compensation information of the terminal to a target base station, wherein the delay compensation information is used for determining delay compensation notification of the terminal; the delay compensation notification is used for indicating a delay compensation execution main body of the terminal.

2. The method of claim 1, wherein the delay compensation information comprises at least one of: the method comprises a delay compensation execution body, a delay compensation amount, a delay compensation method, delay compensation precision or a delay compensation scene.

3. The method according to claim 1 or 2, wherein the source base station determining a terminal change cell comprises:

and the source base station determines that the terminal performs cell switching, or the source base station determines that the terminal performs primary cell change.

4. A method according to claim 3, further comprising: the source base station determines that a source cell and a target cell of the terminal change cell respectively belong to different concentration units CU;

5. The method of claim 4, wherein the delay compensation information is carried in a handover request message or a first other message sent by the CU of the source base station to the CU of the target base station over an Xn interface, wherein the first other message is sent by the CU of the source base station after receiving a handover request acknowledgement message of the CU of the target base station to the handover request message.

6. A method according to claim 3, further comprising: the source base station determines that a source cell and a target cell of the terminal change cell belong to different distribution units DU of the same central unit CU;

7. The method according to claim 6, wherein the delay compensation information is carried in a terminal context establishment request message or a second other message sent by the CU to a DU to which the cell after the terminal change belongs through an F1 interface, where the second other message is sent by the CU after receiving a response message to the terminal context establishment of the DU to which the cell after the terminal change belongs.

8. The method according to claim 1 or 2, wherein the source base station determining the terminal change cell comprises:

and the source base station determines that the terminal is an inactive state terminal and the terminal performs cell reselection.

9. The method of claim 8, wherein the delay compensation information is carried in an acquisition terminal context response message or a third other message sent by the source base station to the target base station, where the acquisition terminal context response message is sent by the source base station after receiving the acquisition terminal context request message sent by the target base station, and the third other message is sent by the source base station after sending the acquisition terminal context response message.

10. A method of timing synchronization, comprising:

the target base station receives delay compensation information of the terminal, which is sent by the source base station when the terminal is determined to change the cell;

The target base station determines a delay compensation notice of the terminal according to the delay compensation information; the delay compensation notification is used for indicating a delay compensation execution main body of the terminal.

11. The method of claim 10, wherein the delay compensation information comprises at least one of: the method comprises a delay compensation execution body, a delay compensation amount, a delay compensation method, delay compensation precision or a delay compensation scene.

12. The method according to claim 10 or 11, wherein the target base station determines a delay compensation execution body of the terminal according to the delay compensation information, comprising:

13. The method as recited in claim 12, further comprising:

14. The method according to claim 10 or 11, wherein the target base station determining the delay compensation of the terminal according to the delay compensation information comprises:

the target base station determines a delay compensation execution subject of the terminal as the terminal according to the delay compensation information, and sends a second delay compensation notification to the terminal, wherein the second delay compensation notification is used for indicating the delay compensation execution subject of the terminal as the terminal.

15. The method as recited in claim 14, further comprising:

16. A method of timing synchronization, comprising:

The terminal changes the cell;

The terminal receives a delay compensation notice sent by a target base station, wherein the delay compensation notice is used for indicating a delay compensation execution main body of the terminal; the delay compensation notification is determined according to delay compensation information of the terminal, which is sent to the target base station by the source base station when the terminal changes the cell.

17. The method of claim 16, wherein the terminal changes cells, comprising:

The terminal performs cell switching;

Or the terminal changes the main cell;

or, the terminal is an inactive state terminal and performs cell reselection.

18. The method according to claim 16 or 17, wherein receiving the delay compensation notification sent by the target base station comprises:

19. The method according to claim 16 or 17, wherein receiving the delay compensation notification sent by the target base station comprises:

20. The method of claim 19, wherein the method further comprises:

21. A timing synchronization apparatus, comprising:

a processing unit, configured to determine a terminal change cell;

a sending unit, configured to send delay compensation information of the terminal to a target base station, where the delay compensation information is used to determine a delay compensation notification of the terminal; the delay compensation notification is used for indicating a delay compensation execution main body of the terminal.

22. A timing synchronization apparatus, comprising:

the receiving unit is used for receiving the delay compensation information of the terminal sent by the source base station when the terminal change cell is determined;

The processing unit is used for determining the delay compensation notification of the terminal according to the delay compensation information; the delay compensation notification is used for indicating a delay compensation execution main body of the terminal.

23. A timing synchronization apparatus, comprising:

A processing unit for changing the cell;

The receiving unit is used for receiving a delay compensation notice sent by the target base station, wherein the delay compensation notice is used for indicating a delay compensation execution main body of the terminal; the delay compensation notification is determined according to delay compensation information of the terminal, which is sent to the target base station by the source base station when the terminal changes the cell.

24. A base station comprising a memory, a transceiver, and a processor:

The memory is used for storing a computer program; the transceiver is used for receiving and transmitting data under the control of the processor; the processor for reading the computer program in the memory and performing the method of any of claims 1-9 or 10-15.

25. A terminal comprising a memory, a transceiver, and a processor:

The memory is used for storing a computer program; the transceiver is used for receiving and transmitting data under the control of the processor; the processor for reading the computer program in the memory and performing the method of any of claims 16-20.

26. A processor-readable storage medium, characterized in that the processor-readable storage medium stores a computer program for causing the processor to perform the method of any one of claims 1-9, 10-15 or 16-20.