CN117998564A

CN117998564A - Time-frequency offset estimation method, device and storage medium

Info

Publication number: CN117998564A
Application number: CN202211379991.XA
Authority: CN
Inventors: 骆亚娟; 高秋彬; 李辉; 苏昕; 王达; 宋磊
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2022-11-04
Filing date: 2022-11-04
Publication date: 2024-05-07

Abstract

The embodiment of the application provides a time-frequency offset estimation method, a time-frequency offset estimation device and a storage medium. The method is applied to the terminal and comprises the following steps: receiving a tracking reference signal TRS of a target cell sent by network equipment; and estimating a time-frequency offset based on the TRS of the target cell. According to the time-frequency offset estimation method, the time-frequency offset estimation device and the storage medium, the TRS of the target cell is activated before cell switching, so that the time-frequency offset estimation is carried out before cell switching by the terminal, and the time-frequency offset estimation is accurately synchronous with the target cell, thereby reducing time delay brought by the switching process.

Description

Time-frequency offset estimation method, device and storage medium

Technical Field

The present application relates to the field of communications technologies, and in particular, to a time-frequency offset estimation method, apparatus, and storage medium.

Background

A time-frequency tracking reference signal (TRACKING REFERNECE SIGNAL, TRS) which can be configured and triggered according to the requirement is introduced into a New air interface (New Radio, NR) to realize time-frequency fine synchronization. The NR uses a specially configured channel state Information reference signal (CHANNEL STATE Information-REFERENCE SIGNAL, CSI-RS) as the TRS.

In the related art, after a terminal receives a handover command in a cell handover process and switches from a serving cell to a target cell, a TRS needs to be activated by sending a request field of channel state Information (CHANNEL STATE Information, CSI) in downlink control Information (Downlink Control Information, DCI) through the target cell, then the target cell sends a corresponding TRS according to resource configuration of the TRS, the terminal receives the TRS sent by the target cell, performs time-frequency offset estimation according to the received TRS, realizes synchronization with the target cell, and can perform subsequent data transmission under the target cell after synchronization with the target cell is completed.

However, the above related technical solutions have a technical problem that the delay between the terminal receiving the handover command and the successful access to the target cell is relatively large.

Disclosure of Invention

The embodiment of the application provides a time-frequency offset estimation method, a time-frequency offset estimation device and a storage medium, which are used for solving the technical problem of large time delay in the L1 and L2 mobile switching process in the prior art.

In a first aspect, an embodiment of the present application provides a time-frequency offset estimation method, applied to a terminal, including:

Receiving a tracking reference signal TRS of a target cell sent by network equipment;

and estimating a time-frequency offset based on the TRS of the target cell.

In some embodiments, receiving a TRS of a target cell sent by a network device includes:

receiving indication information sent by network equipment;

determining a time domain location at which the TRS is received based on the indication information;

And receiving TRS of the target cell sent by the network equipment at the time domain position.

In some embodiments, determining a time domain location to receive the TRS based on the indication information comprises:

determining identification information of the target cell based on the indication information;

determining a time cell offset value of a TRS receiving the target cell based on the identification information of the target cell;

A time domain location at which the TRS is received is determined based on the time cell offset value.

In some embodiments, determining a time domain location to receive the TRS based on the time unit offset value comprises:

determining a reference time unit for receiving the TRS; the reference time unit is a time unit for receiving the indication information;

A time domain location at which the TRS is received is determined based on the reference time cell and the time cell offset value.

In some embodiments, after receiving the indication information sent by the network device, the method further includes:

Transmitting positive ACK information to the network device;

The determining a time domain location to receive the TRS based on the time cell offset value includes:

determining a reference time unit for receiving the TRS; the reference time unit is a time unit for transmitting the ACK information;

In some embodiments, the indication information is used to indicate one or more of the following information:

Activating the aperiodic TRS of the target cell;

identification of the target cell;

PCI of the target cell;

receiving a reference time unit of the TRS;

A Channel State Information (CSI) request field; the CSI request field is associated with a target cell; or the CSI request domain is associated with TRS resources/TRS resource sets corresponding to the target cell;

a first bitmap; the first bitmap is used for indicating a target cell; or the first bitmap is used for indicating TRS resources/TRS resource sets corresponding to the target cell;

A second bitmap; the second bitmap is used for indicating a target cell; or the second bitmap is used for indicating the CSI aperiodic activation state corresponding to the target cell; the CSI aperiodic activation state is associated with TRS resources/TRS resource sets corresponding to the target cell; or alternatively, the first and second heat exchangers may be,

The transmission configuration indicates the TCI state; the TCI state is associated with a target cell; or the TCI state is associated with the target cell and the TRS resource/TRS resource set corresponding to the target cell.

In some embodiments, the method further comprises:

receiving configuration information sent by the network equipment;

the configuration information includes one or more of the following:

candidate target cells;

a set of TRS resources associated with the candidate target cell;

TRS resources associated with the candidate target cell;

A CSI request field associated with the candidate target cell;

CSI aperiodic activation status associated with the candidate target cell;

TCI status associated with candidate target cells; or alternatively, the first and second heat exchangers may be,

A time cell offset value associated with the candidate target cell.

In a second aspect, an embodiment of the present application provides a time-frequency offset estimation method, applied to a network device, including:

Transmitting TRS of the target cell to the terminal; the TRS of the target cell is used to estimate the time-frequency offset.

In some embodiments, transmitting the TRS of the target cell includes:

sending indication information to a terminal; the indication information is used for indicating the target cell;

determining a time domain location at which the TRS is transmitted;

and transmitting the TRS of the target cell on the time domain position.

In some embodiments, determining the time domain location at which to transmit the TRS comprises:

Determining a time cell offset value of a TRS transmitting the target cell based on the target cell;

And determining a time domain location at which to transmit the TRS based on the time cell offset value.

In some embodiments, determining a time domain location to transmit the TRS based on the time unit offset value comprises:

determining a reference time unit to transmit the TRS; the reference time unit is a time unit for transmitting the indication information;

a time domain location at which the TRS is transmitted is determined based on the reference time unit and the time unit offset value.

In some embodiments, after sending the indication information to the terminal, the method further includes:

receiving ACK information sent by the terminal;

determining a time domain location to transmit the TRS based on the time cell offset value, comprising:

Determining a reference time unit for receiving the TRS; the reference time unit is a time unit for receiving the ACK information;

Activating the aperiodic TRS of the target cell;

identification of the target cell;

PCI of the target cell;

receiving a reference time unit of the TRS;

a CSI request field; the CSI request field is associated with a target cell; or the CSI request domain is associated with TRS resources/TRS resource sets corresponding to the target cell;

a second bitmap; the second bitmap is used for indicating a target cell; or the second bitmap is used for indicating the CSI aperiodic activation state corresponding to the target cell; the CSI aperiodic activation state is associated with TRS resources/TRS resource sets corresponding to the target cell;

TCI status; the TCI state is associated with a target cell; or the TCI state is associated with the target cell and the TRS resource/TRS resource set corresponding to the target cell.

In some embodiments, the method further comprises:

transmitting configuration information to the terminal;

the configuration information includes one or more of the following:

candidate target cells;

a set of TRS resources associated with the candidate target cell;

TRS resources associated with the candidate target cell;

A CSI request field associated with the candidate target cell;

CSI aperiodic activation status associated with the candidate target cell;

TCI status associated with candidate target cells;

a time cell offset value associated with the candidate target cell.

In a third aspect, an embodiment of the present application provides a terminal, including a memory, a transceiver, and a processor;

A memory for storing a computer program; a transceiver for transceiving data under control of the processor; a processor for reading the computer program in the memory and performing the following operations:

receiving TRS of a target cell sent by network equipment;

and estimating a time-frequency offset based on the TRS of the target cell.

In some embodiments, the processor is further configured to read the computer program in the memory and perform the following:

receiving indication information sent by network equipment;

sending ACK information to the network equipment;

Activating the aperiodic TRS of the target cell;

identification of the target cell;

PCI of the target cell;

receiving a reference time unit of the TRS;

receiving configuration information sent by the network equipment;

the configuration information includes one or more of the following:

candidate target cells;

a set of TRS resources associated with the candidate target cell;

TRS resources associated with the candidate target cell;

A CSI request field associated with the candidate target cell;

CSI aperiodic activation status associated with the candidate target cell;

A time cell offset value associated with the candidate target cell.

In a fourth aspect, an embodiment of the present application provides a network device, including a memory, a transceiver, and a processor;

determining a time domain location at which the TRS is transmitted;

and transmitting the TRS of the target cell on the time domain position.

receiving ACK information sent by the terminal;

Activating the aperiodic TRS of the target cell;

identification of the target cell;

PCI of the target cell;

receiving a reference time unit of the TRS;

transmitting configuration information to the terminal;

the configuration information includes one or more of the following:

candidate target cells;

a set of TRS resources associated with the candidate target cell;

TRS resources associated with the candidate target cell;

A CSI request field associated with the candidate target cell;

CSI aperiodic activation status associated with the candidate target cell;

TCI status associated with candidate target cells;

a time cell offset value associated with the candidate target cell.

In a fifth aspect, an embodiment of the present application provides a time-frequency offset estimation apparatus, including:

A first receiving module, configured to receive a tracking reference signal TRS of a target cell sent by a network device;

an estimation module is configured to estimate a time-frequency offset based on the TRS of the target cell.

In some embodiments, further comprising:

the second receiving module is used for receiving the indication information sent by the network equipment;

a first determining module configured to determine a time domain location at which the TRS is received based on the indication information;

And a third receiving module, configured to receive, at the time domain location, the TRS of the target cell sent by the network device.

In some embodiments, further comprising:

a second determining module, configured to determine identification information of the target cell based on the indication information;

a third determining module, configured to determine, based on the identification information of the target cell, a time unit offset value of a TRS that receives the target cell;

and a fourth determining module, configured to determine a time domain location for receiving the TRS based on the time unit offset value.

In some embodiments, the fourth determining module is specifically configured to:

In some embodiments, further comprising:

A second sending module, configured to send ACK information to the network device;

the fourth determining module is specifically configured to:

Activating the aperiodic TRS of the target cell;

identification of the target cell;

PCI of the target cell;

receiving a reference time unit of the TRS;

In some embodiments, further comprising:

a third receiving module, configured to send a TRS of a target cell to a terminal; the TRS of the target cell is used to estimate the time-frequency offset.

In some embodiments, receiving configuration information sent by the network device;

the configuration information includes one or more of the following:

candidate target cells;

a set of TRS resources associated with the candidate target cell;

TRS resources associated with the candidate target cell;

A CSI request field associated with the candidate target cell;

CSI aperiodic activation status associated with the candidate target cell;

A time cell offset value associated with the candidate target cell.

In a sixth aspect, an embodiment of the present application provides a time-frequency offset estimation apparatus, including:

A first transmitting module, configured to transmit a TRS of a target cell to a terminal; the TRS of the target cell is used to estimate the time-frequency offset.

In some embodiments, further comprising:

The third sending module is used for sending indication information to the terminal; the indication information is used for indicating the target cell;

a fifth determining module, configured to determine a time domain location at which the TRS is transmitted;

and a fourth transmitting module, configured to transmit the TRS of the target cell at the time domain location.

In some embodiments, further comprising:

a sixth determining module, configured to determine, based on the target cell, a time unit offset value for transmitting a TRS of the target cell;

a seventh determining module, configured to determine a time domain location at which to transmit the TRS based on the time unit offset value.

In some embodiments, the seventh determining module is specifically configured to:

In some embodiments, further comprising:

a fourth receiving module, configured to receive ACK information sent by the terminal;

the seventh determining module is specifically configured to:

Activating the aperiodic TRS of the target cell;

identification of the target cell;

PCI of the target cell;

receiving a reference time unit of the TRS;

In some embodiments, further comprising:

A fifth sending module, configured to send configuration information to the terminal;

the configuration information includes one or more of the following:

candidate target cells;

a set of TRS resources associated with the candidate target cell;

TRS resources associated with the candidate target cell;

A CSI request field associated with the candidate target cell;

CSI aperiodic activation status associated with the candidate target cell;

TCI status associated with candidate target cells;

a time cell offset value associated with the candidate target cell.

In a seventh aspect, an embodiment of the present application further provides a processor readable storage medium, where a computer program is stored, where the computer program is configured to cause a processor to perform the time-frequency offset estimation method according to the first aspect or the second aspect.

In an eighth aspect, an embodiment of the present application further provides a computer readable storage medium, where a computer program is stored, where the computer program is configured to cause a computer to perform the time-frequency offset estimation method according to the first aspect or the second aspect.

In a ninth aspect, an embodiment of the present application further provides a communication device readable storage medium, where a computer program is stored, where the computer program is configured to cause a communication device to perform the time-frequency offset estimation method according to the first aspect or the second aspect.

In a tenth aspect, an embodiment of the present application further provides a chip product readable storage medium, where a computer program is stored, where the computer program is configured to cause a chip product to perform the time-frequency offset estimation method according to the first aspect or the second aspect.

According to the time-frequency offset estimation method, the time-frequency offset estimation device and the storage medium, the TRS of the target cell is activated before cell switching, so that the terminal performs time-frequency offset estimation by using the TRS of the target cell before cell switching and performs fine synchronization with the target cell, and time delay brought by the switching process is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic flow chart of a time-frequency offset estimation method according to an embodiment of the present application;

FIG. 2 is one of bitmaps of an exemplary scenario of a time-frequency offset estimation method provided by an embodiment of the present application;

FIG. 3 is a second bitmap of an exemplary scenario of a time-frequency offset estimation method provided by an embodiment of the present application;

FIG. 4 is a second flowchart of a time-frequency offset estimation method according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a terminal according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a network device according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a time-frequency offset estimation device according to an embodiment of the present application;

fig. 8 is a second schematic structural diagram of a time-frequency offset estimation device according to an embodiment of the present application.

Detailed Description

In NR, for activation of the aperiodic tracking reference signal (TRACKING REFERENCE SIGNAL, TRS), the prior art configures a TRS for a terminal through radio resource control (Radio Resource Control, RRC) signaling a Non-Zero Power channel state Information reference signal resource set (Non Zero Power-CHANNEL STATE Information-REFERENCE SIGNAL-ResourceSet, NZP-CSI-RS-resource set), and then completes activation of the aperiodic TRS through a channel state Information (CHANNEL STATE Information, CSI) request field (6 bits) within downlink control Information (Downlink Control Information, DCI) format 0_1 (format 0_1). A specific procedure is that a 6-bit CSI request (CSI request) corresponds to one of 128 CSI aperiodic active states (CSI-AperiodicTriggerState), each CSI-AperiodicTriggerState is associated with one CSI reporting configuration (CSI-ReportConfig), one CSI-ReportConfig is associated with one CSI resource configuration (CSI-ResourceConfig), and NZP-CSI-RS-resource set carrying TRS information, i.e. NZP-CSI-RS-ResourceSet with TRS-Info, is included.

The base station transmits an activated TRS, and the terminal demodulates the DCI format 0_1 indication transmitted by the network, receives the TRS in a slot separated from the received DCI format 0_1 by an aperiodic trigger offset (aperiodicTriggeringOffset) in the order of CSI request、CSI-AperiodicTriggerState、CSI-ReportConfig、CSI-ResourceConfig、NZP-CSI-RS-ResourceSet with trs-Info contained therein, and the specific receiving time-frequency resource is determined by a channel state information reference signal resource map (CSI-RS-ResourceMapping). If 4 non-zero power channel state information reference signal resources (NZP-CSI-RS-Resource) are configured, the terminal receives TRS in two adjacent time slots; if 2 NZP-CSI-RS-Resource are configured, the terminal receives the TRS in one slot.

However, when L1 and L2 are mobile switched, the TRS of the candidate cell needs to be activated first after receiving the switching command to access the candidate cell, so that data interruption is caused during switching. If the TRS used for implementing the TRS activation of the candidate cell is a non-periodic TRS, since the terminal cannot receive the physical downlink control channel (Physical Downlink Control Channel, PDCCH) of the neighboring candidate cell at this time, only the TRS of the cell can be activated by adopting the method of activating the CSI request field in the conventional DCI, so that the activation of the TRS of the candidate cell cannot be completed before the handover command by using the existing method, and thus the accurate estimation of the frequency offset when the neighboring cell is not implemented by using the activated TRS, resulting in an increase in the delay in the handover process.

Based on the technical problems, the embodiment of the application provides a time-frequency offset estimation, which enables a terminal to perform time-frequency offset estimation before cell switching and perform fine synchronization with a target cell by receiving a TRS of the target cell before cell switching and activating an aperiodic TRS of the target cell, thereby reducing time delay brought by the switching process.

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. 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.

Fig. 1 is one of flow diagrams of a time-frequency offset estimation method provided by an embodiment of the present application, and as shown in fig. 1, an embodiment of the present application provides a time-frequency offset estimation method, an execution body of which may be a terminal, for example, a mobile phone, etc. The method comprises the following steps:

step 101, receiving a TRS of a target cell sent by a network device.

Specifically, before cell switching, the network device sends a TRS of the target cell to the terminal, including a periodic TRS and an aperiodic TRS, and the terminal receives the TRS of the target cell sent by the network device.

Step 102, estimating a time-frequency offset based on the TRS of the target cell.

Specifically, after receiving the TRS of the target cell sent by the network device, the terminal performs time-frequency offset estimation by using the TRS of the target cell.

For example, the network device configures the terminal with non-periodic TRSs and/or periodic TRSs of all candidate target cells through higher layer signaling or RRC signaling, and simultaneously configures the terminal with transmission configuration indication (Transmission Configuration Indication, TCI) state (i.e., TCI state) of all candidate target cells through higher layer signaling. The network device selects and activates the target cell according to the measurement report result of the terminal cell level, and activates the non-periodic TRS of the target cell at the same time, that is, the network device sends the non-periodic TRS and/or the periodic TRS of the target cell in a certain time unit, and the terminal receives the non-periodic TRS and/or the periodic TRS of the target cell in the time unit. The terminal demodulates the received aperiodic TRS and/or periodic TRS of the target cell and estimates the time and frequency offset using the demodulated aperiodic TRS and/or periodic TRS.

According to the time-frequency offset estimation method provided by the embodiment of the application, the TRS of the target cell is activated before the cell switching, so that the terminal performs time-frequency offset estimation by using the TRS of the target cell before the cell switching and performs fine synchronization with the target cell, thereby reducing the time delay brought by the switching process.

receiving indication information sent by network equipment;

Specifically, after the network device selects the target cell, the network device sends indication information for indicating the target cell to the terminal, the terminal receives the indication information, and obtains relevant information of the target cell according to the indication information, so as to obtain relevant information of a TRS corresponding to the target cell, thereby determining a time domain position of the TRS of the receiving target cell in combination with a time unit for receiving the indication information. The network device determines the time domain position of the TRS of the target cell according to the time unit of sending the indication information and the related information of the TRS of the target cell. And then the network equipment transmits the TRS of the target cell to the terminal at the determined time domain position, and the terminal receives the TRS of the target cell transmitted by the network equipment at the determined time domain position.

For example, the network device transmits indication information for indicating that the target cell is cell 3 to the terminal, and determines that the time domain position of the TRS of the transmitting cell 3 is the 7 th slot according to the time unit for transmitting the indication information and the related information of the target cell.

According to the time-frequency offset estimation method provided by the embodiment of the application, the network equipment sends the indication information for indicating the target cell to the terminal before the cell is switched, and the terminal can determine the time-frequency resource for receiving the TRS of the target cell based on the indication information, so that the terminal can activate the TRS of the target cell before the switching, and the TRS of the activated target cell is used for realizing accurate estimation of the frequency offset of the target cell, thereby saving the time delay in the switching process.

Specifically, the network device configures non-periodic TRSs and periodic TRSs of all candidate target cells for the terminal through higher layer signaling such as RRC signaling, and correspondingly configures identification information of the candidate target cells, that is, the TRSs of the candidate target cells are associated with the identification information of the candidate target cells; meanwhile, the network configures the non-periodic TRS activated time unit offset values of all candidate target cells for the terminal through higher layer signaling or RRC signaling.

The terminal receives indication information sent by the network device, the indication information indicates identification information of the target cell, determines a time unit offset value of the corresponding receiving target cell TRS based on the identification information, and then determines a time domain position of the receiving TRS based on the time unit offset value.

For example, the network device configures the terminal with TRSs of all candidate target cells (including cell 1, cell 3, and cell 5) and identification information of the candidate target cells, such as physical cell identities (PHYSICAL CELL IDENTIFIER, PCI), and the physical cell identities of cell 1, cell 3, and cell 5 are PCI1, PCI3, and PCI5, respectively, through higher layer signaling. The network device further configures, through higher layer signaling, the time unit offset value for activating the aperiodic TRS corresponding to the candidate target cell identifier, e.g., configures the time unit offset values for activating the aperiodic TRS corresponding to PCI1, PCI3, and PCI5 to be 5, and 3, respectively.

After selecting the candidate target cell 3 as the target cell, the network device sends indication information to the terminal, and the network device determines the time domain position of the TRS of the sending target cell 3 by taking the time unit for sending the indication information as the reference time unit for sending the TRS of the target cell and adding the time unit offset value 5 of the target cell 3 for activating the aperiodic TRS.

The terminal obtains the identification information of the target cell according to the received indication information, obtains the time unit offset value of 5 of the target cell 3 for activating the non-periodic TRS according to the association relation between the identification information and the configuration, and adds the time unit for receiving the indication information to obtain the time domain position of the TRS of the target cell 3.

Specifically, when the terminal receives the indication information sent by the network device, the time unit for receiving the indication information is the reference time unit for receiving the TRS of the target cell. Similarly, the time unit in which the network device transmits the indication information is the reference time unit for transmitting the TRS of the target cell.

The terminal determines a time cell offset value of the reception target cell TRS based on the indication information, thereby determining a time domain position of the reception target cell TRS as a reference time cell plus the time cell offset value. Likewise, the network device determines the time domain location of the transmitting target cell TRS by adding the reference time unit to the time unit offset value of the target cell for activating the aperiodic TRS.

For example, when the network device sends the indication information for indicating the target cell 3 to the terminal in the time slot n, the network device uses the time slot n as a reference time unit for sending the TRS of the target cell, determines that the offset value of the time unit for activating the aperiodic TRS of the target cell 3 is 5, and determines that the time domain position of the TRS of the target cell 3 sent by the network device is n+5.

The terminal receives the indication information, takes a time slot n for receiving the indication information as a reference time unit for receiving the TRS of the target cell, determines the identification information of the target cell as the identification information of the cell 3 based on the indication information, so as to determine that the offset value of the time unit for activating the non-periodic TRS of the cell 3 corresponding to the identification information is 5, and determines that the time domain position of the TRS of the target cell 3 received by the terminal is n+5.

According to the time-frequency offset estimation method provided by the embodiment of the application, the time unit of the network equipment for sending the indication information to the terminal is used as the reference time unit for sending or receiving the TRS of the target cell, and the time unit offset value of the target cell for activating the non-periodic TRS is combined, so that the terminal can rapidly determine the time domain position of the receiving TRS, and the time delay of the switching process is further reduced.

transmitting Acknowledgement (ACK) information to the network equipment;

Specifically, after receiving the indication information, the terminal sends Acknowledgement (ACK) information to the network device, uses a time unit for sending the ACK information as a reference time unit of the TRS of the receiving target cell, and determines a time domain position of the receiving TRS in combination with the time unit offset value.

The network equipment receives the ACK information sent by the terminal, takes a time unit for receiving the ACK information as a reference time unit for sending the TRS of the target cell, and determines the time domain position of the TRS by combining the time unit offset value.

For example, when the terminal receives the indication information, determines that the offset value of the time unit of the target cell 3 for activating the aperiodic TRS is 5 based on the indication information, and feeds back ACK information to the network device, and uses the time slot m for transmitting the ACK information as the reference time unit for receiving the TRS of the target cell, the time domain position of the terminal for receiving the TRS of the target cell is m+5.

And the network equipment receives the ACK information sent by the terminal, takes a time slot m for receiving the ACK information as a reference time unit for sending the target cell TRS, determines that the offset value of the time unit for activating the non-periodic TRS of the target cell 3 is 5, and obtains the time domain position of the target cell TRS sent by the network equipment as m+5.

According to the time-frequency offset estimation method provided by the embodiment of the application, the terminal is used for carrying out ACK feedback on the indication information sent by the network equipment, the time unit fed back with the ACK is used as the reference time unit for receiving or sending the TRS, and the time unit offset value activated by the aperiodic TRS of the target cell is combined, so that the network equipment and the terminal can quickly determine the time domain position of the activated TRS, and the terminal carries out fine synchronization according to the time-frequency offset of the TRS of the target cell estimated by the TRS of the target cell, thereby reducing the time delay in the switching process.

Activating the aperiodic TRS of the target cell;

identification of the target cell;

PCI of the target cell;

receiving a reference time unit of the TRS;

For example, the indication information indicates the terminal to activate the aperiodic TRS of the target cell and indicates the identity of the target cell, and the terminal can acquire the identity information of the target cell after receiving the indication information, so as to find the corresponding target cell according to the identity information, and also acquire the TRS of the target cell to be sent by the network device at a specific time unit from the indication information.

For another example, if the indication information indicates the identity or PCI of the target cell, the terminal receives the indication information, and can learn which target cell is a candidate target cell, and activate the aperiodic TRS of the target cell.

For another example, a CSI request field is obtained from the indication information, where the CSI request field corresponds to a CSI aperiodic activation state, and one CSI request field corresponds to one CSI aperiodic activation state, and each CSI aperiodic activation state corresponds to a target cell and an aperiodic TRS of the target cell to be activated. For example, the aperiodic TRS of the terminal activation target cell is indicated with the CSI request field (6 bits). The network device sends indication information to the terminal, where the indication information indicates that one CSI request field is 000000, and corresponds to a first CSI aperiodic activation state, and the state indicates to activate an aperiodic TRS in a TRS resource set corresponding to cell 1.

For another example, the first bitmap is obtained from the indication information, and the target cell can be obtained through the first bitmap, and the TRS resource or the TRS resource set corresponding to the target cell can also be obtained. For example, in the first bitmap, the bit indicating the cell 3 is 1, and the bit indicating the other cells is 0, which indicates that the cell 3 is the target cell, and activates the aperiodic TRS of the target cell 3; a1 on the bit indicating the TRS resource set 2 and a 0 on the bit indicating the other resource sets (NZP-CSI-RS-resource) indicates that the TRS in the TRS resource set 2 of the target cell 3 is activated.

For another example, the second bitmap is obtained from the indication information, and the target cell can be obtained through the second bitmap, and the CSI aperiodic activation state corresponding to the target cell can also be obtained, where each CSI aperiodic activation state corresponds to the target cell and the aperiodic TRS of the target cell to be activated. For example, in the second bitmap, the bit indicating the cell 3 is 1, and the bit indicating the other cells is 0, which indicates that the cell 3 is the target cell, and activates the aperiodic TRS of the target cell 3; only bits indicating CSI-AperiodicTriggerState1 and CSI-AperiodicTriggerState3 are 1 on bits indicating CSI aperiodic activation state (CSI-AperiodicTriggerState), wherein CSI-AperiodicTriggerState1 is associated with TRS resource 1 and TRS resource 2, and CSI-AperiodicTriggerState3 is associated with TRS resource 3 and TRS resource 4 according to configuration information, and then TRS resource 1, TRS resource 2, TRS resource 3, and TRS resource 4 of the activation target cell 3 are indicated.

For another example, the network device sends indication information to the terminal, the indication information indicating a TCI state indicating the activation target cell and its multiple TRS resources. For example, the candidate target cell 1 is configured to include TCI state1 (TCI state 1), TCI state2, TCI state3 and TCI state4, and the candidate target cell 3 includes TCI state5, TCI state6 and TCI state7. The indication information indicates TCI state1, it may be known that the target cell is cell 1, and the aperiodic TRS corresponding to cell 1 is activated.

In some embodiments, the method further comprises:

receiving configuration information sent by the network equipment;

the configuration information includes one or more of the following:

candidate target cells;

a set of TRS resources associated with the candidate target cell;

TRS resources associated with the candidate target cell;

A CSI request field associated with the candidate target cell;

CSI aperiodic activation status associated with the candidate target cell;

A time cell offset value associated with the candidate target cell.

Optionally, the network device configures the terminal with the aperiodic TRS and periodic TRS of all candidate target cells and associated other information through higher layer signaling or RRC signaling.

For example, for periodic TRSs, the configuration information includes candidate target cells and a set of TRS resources associated with the candidate target cells. The TRS resource set may be configured by configuring a Non Zero Power (NZP) channel state Information reference signal (CHANNEL STATE Information-REFERENCE SIGNAL, CSI-RS) resource set (resource set) for the terminal, and expanding the number of NZP CSI-RS resources contained in this NZP CSI-RS resource set to 4M or 2M groups, where M is greater than 1. The CSI-RS resources in each group are associated with the PCI of one candidate target cell, such as configuring the PCI or PCI indication in NZP-CSI-RS-Resource.

If the terminal is configured with multiple sets of NZP CSI-RS resources, the sets of NZP CSI-RS resources are associated with PCI, such as configuring PCI or PCI indication in the NZP-CSI-RS-resource set.

For another example, the configuration information includes a candidate target cell, a set of TRS resources associated with the candidate target cell, and a CSI request field associated with the candidate target cell. Associating the candidate target cell with the TRS resource or the TRS resource set of the corresponding candidate target cell, and associating a CSI request field (6 bits) in the DCI of the cell with the candidate target cell, where one CSI request field corresponds to one candidate target cell, and since the candidate target cell is associated with the TRS resource or the TRS resource set of the corresponding candidate target cell, determining the aperiodic TRS of the target cell and the target cell to be activated according to the indication information by using the configuration; the CSI request field may also be associated with a TRS resource or a TRS resource set of the candidate target cell, and since the TRS resource or the TRS resource set of the candidate target cell is associated with the candidate target cell, the aperiodic TRS of the target cell and the target cell to be activated may be determined according to the CSI request field in the indication information using the configuration.

For another example, the configuration information includes a candidate target cell, a set of TRS resources associated with the candidate target cell, a time unit offset value associated with the candidate target cell, a CSI request field associated with the candidate target cell, and a CSI aperiodic activation state associated with the candidate target cell. The procedure of activating the target cell TRS with this configuration and performing frequency offset estimation based on the indication information is as shown in example 1.

Example 1:

Step 1: the network configures the TRS of the candidate target cell for the terminal through RRC signaling: the aperiodic TRS of PCI1 is NZP-CSI-RS-Resource set1, which comprises NZP-CSI-RS-Resource1 and NZP-CSI-RS-Resource2; the aperiodic TRS of PCI3 is NZP-CSI-RS-Resource set2, which comprises NZP-CSI-RS-Resource1, NZP-CSI-RS-Resource2, NZP-CSI-RS-Resource3 and NZP-CSI-RS-Resource4; the aperiodic TRS of PCI5 is NZP-CSI-RS-Resource set1, which comprises NZP-CSI-RS-Resource1 and NZP-CSI-RS-Resource2. Meanwhile, the network configures the time cell offset values (aperiodicTriggeringOffsetMobility) of the aperiodic TRS activation in PCI1, PCI3, PCI5 to be 5,3, respectively, through RRC.

Step 2: the network device transmits indication information to the terminal, and determines a time domain position of the transmission target cell TRS based on the indication information: in the nth time slot, the network transmits DCI format 0_1, the CSI request field (CSI request field) contained in the DCI format 0_1 is 000000, corresponding to the first CSI-AperiodicTriggerState of 128 CSI aperiodic active states (CSI-AperiodicTriggerState), corresponding to PCI1 in the candidate target cell and the TRS resource or TRS resource set associated with PCI1, indicating that the aperiodic TRS in PCI1 is activated, and the network device transmits the TRS of the target cell in the n+5 time slot.

Step 3: the base station of the target cell transmits the TRS of the target cell in the n+5 time slot.

Step 4: the terminal receives the indication information sent by the network equipment and determines the time domain position of the TRS of the receiving target cell based on the indication information: the terminal demodulates the DCI format0_1 indication sent by the network in step 2, and receives the TRS in the n+5 time slot aperiodicTriggeringOffse =5 from the received DCI format0_1 according to the sequence CSI request、CSI-AperiodicTriggerState、CSI-ReportConfig、CSI-ResourceConfig、NZP-CSI-RS-ResourceSet with trs-Info contained therein, where the specific received time-frequency Resource is determined by the frequency-domain allocation (frequencyDomainAllocation) and the time-domain first orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) symbol (firstOFDMSymbolInTimeDomain) parameters in the NZP-CSI-RS-Resource.

Step 5: the terminal estimates the time and frequency offset using the TRS demodulated in step 4.

For another example, the configuration information includes a candidate target cell, a time cell offset value associated with the candidate target cell, a set of TRS resources associated with the candidate target cell, and TRS resources associated with the candidate target cell. The procedure for activating the target cell TRS with the configuration and performing frequency offset estimation based on the first bitmap in the indication information is as shown in example 2.

Example 2:

And adding TRS configuration for adjacent cells in the cell configuration, selecting and activating a target cell by the network according to a cell-level measurement report result of the terminal, and associating the activation of the non-periodic TRS of the corresponding cell in a candidate target cell activation command in a bitmap (bitmap) form. The bitmap is transmitted by a medium access Control unit (MEDIA ACCESS Control Element, MAC CE) command that activates the target cell and the non-periodic TRS corresponding to the target cell. Alternatively, an aperiodic TRS activation command corresponding to the target cell may be included in the cell handover command.

Fig. 2 is one of bitmaps of an exemplary scenario of the time-frequency offset estimation method provided in the embodiment of the present application, as shown in fig. 2, ci is a candidate target cell, where i=0, 1,2, …,6, and indicates a PCI index (index) or a PCI indicator (indicator). A bit of 1 for Ci indicates that the candidate target cell is activated, and a bit of 0 for Ci indicates that the candidate target cell is not activated. The TRS Resource set ID, i.e., TRS-Resource set ID, where id=0, 1,2, …,6 represents an identification code (ID) of the activated TRS Resource set corresponding to Ci, a bit of 1 corresponding to the TRS-Resource set ID indicates that TRS in the TRS-Resource set ID of Ci is activated, and a bit of 0 corresponding to the TRS-Resource set ID indicates that TRS in the TRS-Resource set ID is not activated. The TRS is activated through a bitmap form, and the specific steps of frequency offset estimation are as follows:

Step 1: the network configures the TRS of the candidate target cell for the terminal through RRC signaling: the aperiodic TRS of PCI1 is NZP-CSI-RS-Resource set1, which comprises NZP-CSI-RS-Resource1 and NZP-CSI-RS-Resource2; the aperiodic TRS of PCI3 is NZP-CSI-RS-Resource set2, which comprises NZP-CSI-RS-Resource1, NZP-CSI-RS-Resource2, NZP-CSI-RS-Resource3 and NZP-CSI-RS-Resource4; the aperiodic TRS of PCI5 is NZP-CSI-RS-Resource set1, which comprises NZP-CSI-RS-Resource1 and NZP-CSI-RS-Resource2. Meanwhile, the network configures PCI1, PCI3, aperiodicTriggeringOffsetMobility in PCI5 as 5,3 respectively through RRC.

Step 2: the network sends a first bitmap to the terminal through a MAC CE command according to the measurement report result of the terminal cell level, and the first bitmap indicates activation target cell PCI3 and aperiodic TRSs (including nzp-CSI-RS-Resource1, nzp-CSI-RS-Resource2, nzp-CSI-RS-Resource3 and nzp-CSI-RS-Resource 4) in the target cell.

The MAC CE used for the activation is transmitted on a physical downlink shared channel (Physical Downlink SHARED CHANNEL, PDSCH) on slot (slot) n. The bitmap indicating active aperiodic TRS is shown in fig. 2, where c3=1 indicates that PCI3 is activated. The corresponding TRS-Resource set2 = 1 represents 4 NZP-CSI-RS resources in NZP-CSI-RS-Resource set2 in PCI 3: nzp-CSI-RS-Resource1, nzp-CSI-RS-Resource2, nzp-CSI-RS-Resource3 and nzp-CSI-RS-Resource4 are activated.

Step 3: the time domain position of the network transmission target cell TRS (i.e., the time domain position of the terminal reception target cell TRS) can be determined by either one of the following two ways a and b:

a. The time domain position of the TRS transmitting the PCI3 is determined based on the time unit transmitting the MAC CE and the time unit offset value of the PCI 3. The network transmits nzp-CSI-RS-Resource1, nzp-CSI-RS-Resource2 on the time-frequency Resource of slot+5, and transmits nzp-CSI-RS-Resource3 and nzp-CSI-RS-Resource4 on the time-frequency Resource of slot+6. The specific time-frequency resources in each slot are determined by frequencyDomainAllocation and firstOFDMSymbolInTimeDomain parameters in the NZP-CSI-RS-Resource.

B. The time domain position of the TRS transmitting PCI3 is determined based on the time unit of the terminal feedback ACK and the time unit offset value of PCI 3. The terminal detects the MAC CE command of the network side, sends feedback of mixed automatic retransmission request acknowledgement (Hybrid Automatic Repeat reQuest acknowledgement, HARQ ACK) to the network side, and determines that the time slot of the aperiodic TRS is slot m+5 (aperiodicTriggeringOffsetMobility of PCI3 is 5) and slot m+6, wherein m represents the time slot of the terminal for HARQ-ACK feedback to the network side, and the terminal receives and demodulates nzp-CSI-RS-Resource1 and nzp-CSI-RS-Resource2 on time-frequency resources of slot m+5. The terminal receives and demodulates nzp-CSI-RS-Resource3, nzp-CSI-RS-Resource4 on the time-frequency Resource of slot m+6. The received beam is determined by a reference signal (Quasi colocation-InfoPeriodic CHANNEL STATE Information-REFERENCE SIGNAL, qcl-InfoPeriodicCSI-RS) of the channel state Information of the quasi co-located Information period.

Step 4: the network transmits an aperiodic TRS on the corresponding time and frequency resources in step 3, and the terminal receives the TRS on the corresponding time and frequency resources and estimates time and frequency offsets using the demodulated TRS.

For another example, the configuration information includes a candidate target cell, a set of TRS resources associated with the candidate target cell, a time cell offset value associated with the candidate target cell, and a CSI aperiodic activation state associated with the candidate target cell. The procedure of activating the target cell TRS with this configuration and performing frequency offset estimation based on the second bitmap in the indication information is as shown in example 3.

Example 3:

The transmission of the neighbor cell TRS is activated by the network displaying a channel state information aperiodic activation state (CSI-AperiodicTriggerState) indication in the activation signaling.

And reusing the A-TRS triggering mode, and displaying indication CSI-AperiodicTriggerState in the activation signaling. One CSI-AperiodicTriggerState may indicate one or more TRSs on one cell, and the specific correspondence may be completed through RRC configuration. Such as CSI-AperiodicTriggerState1 triggering TRS resource 3 on PCI 1; CSI-AperiodicTriggerState2 triggers TRS resource 1 on PCI2, TRS resource 3 on PCI3, etc.

Fig. 3 is a second bitmap of an exemplary scenario of the time-frequency offset estimation method provided in the embodiment of the present application, as shown in fig. 3, ci is a candidate target cell, where i=0, 1,2, …, and 6 represents a PCI index or a PCI indicator. A bit of 1 for Ci indicates that the candidate target cell is activated, and a bit of 0 for Ci indicates that the candidate target cell is not activated. CSI aperiodic active state j, i.e., CSI-AperiodicTriggerStatej, where j=0, 1,2, …,6 represents a corresponding active state indication of the TRS resource being activated, a bit of 1 for CSI-AperiodicTriggerStatej indicates that the TRS resource corresponding to the state is activated, and a bit of 0 for CSI-AperiodicTriggerStatej indicates that the TRS resource corresponding to the state is not activated. The specific steps for activating the TRS and performing time-frequency offset estimation are as follows, as indicated by CSI-AperiodicTriggerState:

Increasing configuration information of CSI aperiodic activation states associated with candidate target cells: the network triggers TRS Resource1 (nzp-CSI-RS-Resource 1) and TRS Resource2 (nzp-CSI-RS-Resource 2) on PCI3 through RRC configuration of CSI-AperiodicTriggerState 1; CSI-AperiodicTriggerState3 triggers TRS Resource3 (nzp-CSI-RS-Resource 3) and TRS Resource4 (nzp-CSI-RS-Resource 4) on PCI 3; CSI-AperiodicTriggerState2 triggers TRS resource1 and TRS resource2 on PCI 1.

Step 2: the network indicates the activation target cell PCI3 and the CSI non-periodic activation state corresponding to the PCI3 through the second bitmap according to the measurement report result of the terminal cell level, and activates the non-periodic TRS (including nzp-CSI-RS-Resource1, nzp-CSI-RS-Resource2, nzp-CSI-RS-Resource3 and nzp-CSI-RS-Resource 4) in the target cell PCI3 through the CSI non-periodic activation state.

The bitmap of the active aperiodic TRS is as follows, and the MAC CE used for the activation is transmitted on the PDSCH on slot n. As shown in fig. 3, c3=1 indicates that PCI3 is activated. Corresponding CSI-AperiodicTriggerState 1=1 means that corresponding nzp-CSI-RS-Resource1 and nzp-CSI-RS-Resource2 of CSI-AperiodicTriggerState1 are activated. CSI-AperiodicTriggerState3 =1 means that the corresponding nzp-CSI-RS-Resource3 and nzp-CSI-RS-Resource4 of CSI-AperiodicTriggerState are activated.

B. The time domain position of the TRS transmitting PCI3 is determined based on the time unit of the terminal feedback ACK and the time unit offset value of PCI 3. The terminal detects the MAC CE command of the network side, performs HARQ-ACK feedback on the network side, and determines the time slots of the aperiodic TRS as slot m+5 (aperiodicTriggeringOffsetMobility) and slotm +6 according to a predefined rule, wherein m represents the time slot of the terminal performing HARQ-ACK feedback on the network side. The terminal receives and demodulates nzp-CSI-RS-Resource1 and nzp-CSI-RS-Resource2 on a slot m+5 time-frequency Resource; the terminal receives and demodulates nzp-CSI-RS-Resource3, nzp-CSI-RS-Resource4 on the time-frequency Resource of slot m+6. The receive beam is determined by the parameters qcl-InfoPeriodicCSI-RS.

For another example, the configuration information includes a candidate target cell, a set of TRS resources associated with the candidate target cell, a time cell offset value associated with the candidate target cell, and a TCI state associated with the candidate target cell. The procedure for activating the target cell TRS with this configuration and performing frequency offset estimation based on the TCI state in the indication information is as shown in example 4.

Example 4:

The TRS in the additional PCI (i.e., the PCI of the candidate target cell) contained in the TCI state is activated by activating the transmission configuration indication (Transmission Configuration Indication, TCI) state (i.e., TCI state). The method comprises the following steps of activating TRS of a target cell through TCI state indication and performing time frequency offset estimation:

The network configures a TCI state pool for the terminal through high-level signaling: PCI1 includes TCI state1, TCI state2, TCI state3 and TCI state4, and PCI3 includes TCI state 5, TCI state6 and TCI state7.

Step 2: the network sends a MAC-CE command, where TCI state1 is indicated, and PCI corresponding to TCI state1 is PCI1, and the TCI state1 indicates to activate the target cell PCI1 and the aperiodic TRS in PCI 1: NZP-CSI-RS-Resource1 and NZP-CSI-RS-Resource2 in NZP-CSI-RS-Resource set 1.

According to the time-frequency offset estimation method, the time-frequency offset estimation device and the storage medium, the TRS of the target cell is activated before cell switching, so that the terminal performs time-frequency offset estimation by using the TRS of the target cell before cell switching and performs fine synchronization with the target cell, and time delay caused by the switching process is reduced.

Fig. 4 is a second flow chart of a time-frequency offset estimation method according to the embodiment of the present application, as shown in fig. 4, where an execution body of the time-frequency offset estimation method may be a network device, for example, a base station. The method comprises the following steps:

Step 401, transmitting TRS of a target cell to a terminal; the TRS of the target cell is used to estimate the time-frequency offset.

In some embodiments, transmitting the TRS of the target cell includes:

determining a time domain location at which the TRS is transmitted;

and transmitting the TRS of the target cell on the time domain position.

receiving ACK information sent by the terminal;

Activating the aperiodic TRS of the target cell;

identification of the target cell;

PCI of the target cell;

receiving a reference time unit of the TRS;

In some embodiments, the method further comprises:

transmitting configuration information to the terminal;

the configuration information includes one or more of the following:

candidate target cells;

a set of TRS resources associated with the candidate target cell;

TRS resources associated with the candidate target cell;

A CSI request field associated with the candidate target cell;

CSI aperiodic activation status associated with the candidate target cell;

TCI status associated with candidate target cells;

a time cell offset value associated with the candidate target cell.

Specifically, the time-frequency offset estimation method provided by the embodiment of the present application may refer to the time-frequency offset estimation method embodiment in which the execution body is the terminal, and may achieve the same technical effects, and the same parts and beneficial effects as those of the corresponding method embodiment in the embodiment are not described in detail herein.

Fig. 5 is a schematic structural diagram of a terminal according to an embodiment of the present application, as shown in fig. 5, where the terminal includes a memory 520, a transceiver 500, and a processor 510, where:

a memory 520 for storing a computer program; a transceiver 500 for transceiving data under the control of the processor 510; a processor 510 for reading the computer program in the memory 520 and performing the following operations:

receiving TRS of a target cell sent by network equipment;

and estimating a time-frequency offset based on the TRS of the target cell.

Specifically, the transceiver 500 is used to receive and transmit data under the control of the processor 510.

Where in FIG. 5, a bus architecture may comprise any number of interconnected buses and bridges, with various circuits of the one or more processors, as represented by processor 510, and the memory, as represented by memory 520, being 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. Transceiver 500 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 user interface 530 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 510 is responsible for managing the bus architecture and general processing, and the memory 520 may store data used by the processor 510 in performing operations.

In some embodiments, processor 510 may be a central processing unit (Central Processing Unit, CPU), application SPECIFIC INTEGRATED Circuit (ASIC), field-Programmable gate array (Field-Programmable GATE ARRAY, FPGA), or complex Programmable logic device (Complex Programmable Logic Device, CPLD), which 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.

receiving indication information sent by network equipment;

sending ACK information to the network equipment;

Activating the aperiodic TRS of the target cell;

identification of the target cell;

PCI of the target cell;

receiving a reference time unit of the TRS;

receiving configuration information sent by the network equipment;

the configuration information includes one or more of the following:

candidate target cells;

a set of TRS resources associated with the candidate target cell;

TRS resources associated with the candidate target cell;

A CSI request field associated with the candidate target cell;

CSI aperiodic activation status associated with the candidate target cell;

A time cell offset value associated with the candidate target cell.

It should be noted that, the terminal provided by the embodiment of the present application can implement all the method steps implemented by the method embodiment in which the execution body is a terminal, 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 embodiment are omitted herein.

Fig. 6 is a schematic structural diagram of a network device according to an embodiment of the present application, as shown in fig. 6, where the network device includes a memory 620, a transceiver 600, and a processor 610, where:

a memory 620 for storing a computer program; a transceiver 600 for transceiving data under the control of the processor 610; a processor 610 for reading the computer program in the memory 620 and performing the following operations:

Specifically, the transceiver 600 is used to receive and transmit data under the control of the processor 610.

Wherein in fig. 6, a bus architecture may comprise any number of interconnected buses and bridges, and in particular one or more processors represented by processor 610 and various circuits of memory represented by memory 620, 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. Transceiver 600 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 610 is responsible for managing the bus architecture and general processing, and the memory 620 may store data used by the processor 610 in performing operations.

The processor 610 may be a central processing unit (Central Processing Unit, CPU), application SPECIFIC INTEGRATED Circuit (ASIC), field-Programmable gate array (Field-Programmable GATE ARRAY, FPGA), or complex Programmable logic device (Complex Programmable Logic Device, CPLD), and the processor may also employ a multi-core architecture.

determining a time domain location at which the TRS is transmitted;

and transmitting the TRS of the target cell on the time domain position.

receiving ACK information sent by the terminal;

Activating the aperiodic TRS of the target cell;

identification of the target cell;

PCI of the target cell;

receiving a reference time unit of the TRS;

transmitting configuration information to the terminal;

the configuration information includes one or more of the following:

candidate target cells;

a set of TRS resources associated with the candidate target cell;

TRS resources associated with the candidate target cell;

A CSI request field associated with the candidate target cell;

CSI aperiodic activation status associated with the candidate target cell;

TCI status associated with candidate target cells;

a time cell offset value associated with the candidate target cell.

Specifically, the network device provided by the embodiment of the present application can implement all the method steps implemented by the method embodiment in which the execution body is a network device, 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.

Fig. 7 is a schematic structural diagram of a time-frequency offset estimation device according to an embodiment of the present application, and as shown in fig. 7, the embodiment of the present application provides a time-frequency offset estimation device, which includes a first receiving module 701 and an estimation module 702, wherein:

The first receiving module is used for receiving a tracking reference signal TRS of a target cell sent by the network equipment;

the estimation module is configured to estimate a time-frequency offset based on a TRS of the target cell.

In some embodiments, further comprising:

a second sending module, configured to send acknowledgement ACK information to the network device;

the fourth determining module is specifically configured to:

Activating the aperiodic TRS of the target cell;

identification of the target cell;

PCI of the target cell;

receiving a reference time unit of the TRS;

In some embodiments, further comprising:

the configuration information includes one or more of the following:

candidate target cells;

a set of TRS resources associated with the candidate target cell;

TRS resources associated with the candidate target cell;

A CSI request field associated with the candidate target cell;

CSI aperiodic activation status associated with the candidate target cell;

A time cell offset value associated with the candidate target cell.

Specifically, the time-frequency offset estimation device provided by the embodiment of the present application can implement all the method steps implemented by the method embodiment in which the execution subject is a terminal, 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.

Fig. 8 is a second schematic structural diagram of a time-frequency offset estimation device according to an embodiment of the present application, and as shown in fig. 8, the embodiment of the present application provides a time-frequency offset estimation device, which includes a first sending module 801.

The first sending module 801 is configured to send a TRS of a target cell to a terminal; the TRS of the target cell is used to estimate the time-frequency offset.

In some embodiments, further comprising:

the seventh determining module is specifically configured to:

Activating the aperiodic TRS of the target cell;

identification of the target cell;

PCI of the target cell;

receiving a reference time unit of the TRS;

In some embodiments, further comprising:

the configuration information includes one or more of the following:

candidate target cells;

a set of TRS resources associated with the candidate target cell;

TRS resources associated with the candidate target cell;

A CSI request field associated with the candidate target cell;

CSI aperiodic activation status associated with the candidate target cell;

TCI status associated with candidate target cells;

a time cell offset value associated with the candidate target cell.

Specifically, the time-frequency offset estimation device provided by the embodiment of the present application can implement all the method steps implemented by the method embodiment in which the execution body is a network device, 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 embodiment are omitted herein.

It should be noted that the division of the units/modules in the above embodiments of the present application is merely a logic function division, and other division manners may be implemented in 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, 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.

In some embodiments, there is also provided a computer-readable storage medium storing a computer program for causing a computer to execute the time-frequency offset estimation method provided by the above-described method embodiments.

Specifically, the computer readable storage medium provided by the embodiment of the present application can implement all the method steps implemented by the above method embodiments and achieve the same technical effects, and the parts and beneficial effects that are the same as those of the method embodiments in this embodiment are not described in detail herein.

It should be noted that: the computer 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, nonvolatile memory (NAND FLASH), solid State Disk (SSD)), etc.

In addition, it should be noted that: the terms "first," "second," and the like in embodiments of the present application are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in sequences other than those illustrated or otherwise described herein, and that the "first" and "second" distinguishing between objects generally are not limited in number to the extent that the first object may, for example, be one or more.

In the embodiment of the application, the term "and/or" describes the association relation of the association objects, which means that three relations can exist, for example, a and/or B can be expressed as follows: 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 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 network device according to the embodiment of the present application may be a base station, where the base station may include 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. The network device may be configured to exchange received air frames with internet protocol (Internet Protocol, IP) packets as a router between the wireless terminal device and the rest of the access network, which may include an Internet Protocol (IP) communication network. The network device may also coordinate attribute management for the air interface. For example, the network device according to the embodiment of the present application may be a network device (Base Transceiver Station, BTS) in a global system for mobile communications (Global System for Mobile communications, GSM) or code division multiple access (Code Division Multiple Access, CDMA), a network device (NodeB) in a wideband code division multiple access (Wide-band Code Division Multiple Access, WCDMA), 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), 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), etc., which are not limited in the embodiment of the present application. In some network structures, the network devices may include centralized unit (centralized unit, CU) nodes and Distributed Unit (DU) nodes, which may also be geographically separated.

The term "determining B based on a" in the present application means that a is a factor to be considered in determining B. Not limited to "B can be determined based on A alone", it should also include: "B based on A and C", "B based on A, C and E", "C based on A, further B based on C", etc. Additionally, a may be included as a condition for determining B, for example, "when a satisfies a first condition, B is determined using a first method"; for another example, "when a satisfies the second condition, B" is determined, etc.; for another example, "when a satisfies the third condition, B" is determined based on the first parameter, and the like. Of course, a may be a condition in which a is a factor for determining B, for example, "when a satisfies the first condition, C is determined using the first method, and B is further determined based on C", or the like.

Multiple-input Multiple-output (Multi Input Multi Output, MIMO) transmissions may be made between the network device and the terminal device, each 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.

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. The time-frequency offset estimation method is characterized by being applied to a terminal and comprising the following steps:

and estimating a time-frequency offset based on the TRS of the target cell.

2. The time-frequency offset estimation method according to claim 1, wherein receiving the TRS of the target cell transmitted by the network device comprises:

receiving indication information sent by network equipment;

3. The time-frequency offset estimation method of claim 2, wherein determining a time-domain location at which the TRS is received based on the indication information comprises:

4. The time-frequency offset estimation method of claim 3, wherein determining a time-domain location at which to receive the TRS based on the time-unit offset value comprises:

5. The method for estimating time-frequency offset according to claim 3, further comprising, after receiving the indication information sent by the network device:

transmitting Acknowledgement (ACK) information to the network equipment;

6. The time-frequency offset estimation method according to claim 2, wherein the indication information is used to indicate one or more of the following information:

Activating the aperiodic TRS of the target cell;

identification of the target cell;

Physical cell identity PCI of the target cell;

receiving a reference time unit of the TRS;

7. The method of time-frequency offset estimation according to claim 1, further comprising:

receiving configuration information sent by the network equipment;

the configuration information includes one or more of the following:

candidate target cells;

a set of TRS resources associated with the candidate target cell;

TRS resources associated with the candidate target cell;

A CSI request field associated with the candidate target cell;

CSI aperiodic activation status associated with the candidate target cell;

A time cell offset value associated with the candidate target cell.

8. A time-frequency offset estimation method, which is applied to a network device, comprising:

9. The time-frequency offset estimation method of claim 8, wherein transmitting the TRS of the target cell comprises:

determining a time domain location at which the TRS is transmitted;

and transmitting the TRS of the target cell on the time domain position.

10. The time-frequency offset estimation method of claim 9, wherein determining the time-domain location at which to transmit the TRS comprises:

11. The time-frequency offset estimation method of claim 10, wherein determining the time-domain location at which to transmit the TRS based on the time-unit offset value comprises:

12. The method of time-frequency offset estimation according to claim 10, further comprising, after transmitting the indication information to the terminal:

receiving ACK information sent by the terminal;

13. The time-frequency offset estimation method of claim 9, wherein the indication information is used to indicate one or more of the following information:

Activating the aperiodic TRS of the target cell;

identification of the target cell;

PCI of the target cell;

receiving a reference time unit of the TRS;

14. The method of time-frequency offset estimation according to claim 8, further comprising:

transmitting configuration information to the terminal;

the configuration information includes one or more of the following:

candidate target cells;

a set of TRS resources associated with the candidate target cell;

TRS resources associated with the candidate target cell;

A CSI request field associated with the candidate target cell;

CSI aperiodic activation status associated with the candidate target cell;

TCI status associated with candidate target cells;

a time cell offset value associated with the candidate target cell.

15. A terminal comprising a memory, a transceiver, and a processor;

receiving TRS of a target cell sent by network equipment;

and estimating a time-frequency offset based on the TRS of the target cell.

16. The terminal of claim 15, wherein the processor is further configured to read the computer program in the memory and perform the following:

receiving indication information sent by network equipment;

17. The terminal of claim 16, wherein the processor is further configured to read the computer program in the memory and perform the following:

18. The terminal of claim 17, wherein the processor is further configured to read the computer program in the memory and perform the following:

19. The terminal of claim 17, wherein the processor is further configured to read the computer program in the memory and perform the following:

sending ACK information to the network equipment;

20. The terminal of claim 16, wherein the indication information is used to indicate one or more of the following information:

Activating the aperiodic TRS of the target cell;

identification of the target cell;

PCI of the target cell;

receiving a reference time unit of the TRS;

21. The terminal of claim 15, wherein the processor is further configured to read the computer program in the memory and perform the following:

receiving configuration information sent by the network equipment;

the configuration information includes one or more of the following:

candidate target cells;

a set of TRS resources associated with the candidate target cell;

TRS resources associated with the candidate target cell;

A CSI request field associated with the candidate target cell;

CSI aperiodic activation status associated with the candidate target cell;

A time cell offset value associated with the candidate target cell.

22. A network device comprising a memory, a transceiver, and a processor;

23. The network device of claim 22, wherein the processor is further configured to read the computer program in the memory and perform the following:

determining a time domain location at which the TRS is transmitted;

and transmitting the TRS of the target cell on the time domain position.

24. The network device of claim 23, wherein the processor is further configured to read the computer program in the memory and perform the following:

25. The network device of claim 24, wherein the processor is further configured to read the computer program in the memory and perform the following:

26. The network device of claim 24, wherein the processor is further configured to read the computer program in the memory and perform the following:

receiving ACK information sent by the terminal;

27. The network device of claim 23, wherein the indication information is used to indicate one or more of the following:

Activating the aperiodic TRS of the target cell;

identification of the target cell;

PCI of the target cell;

receiving a reference time unit of the TRS;

28. The network device of claim 22, wherein the processor is further configured to read the computer program in the memory and perform the following:

transmitting configuration information to the terminal;

the configuration information includes one or more of the following:

candidate target cells;

a set of TRS resources associated with the candidate target cell;

TRS resources associated with the candidate target cell;

A CSI request field associated with the candidate target cell;

CSI aperiodic activation status associated with the candidate target cell;

TCI status associated with candidate target cells;

a time cell offset value associated with the candidate target cell.

29. A time-frequency offset estimation device, comprising:

30. A time-frequency offset estimation device, comprising:

31. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for causing a computer to execute the time-frequency offset estimation method according to any one of claims 1 to 14.