Time-frequency offset synchronization method, electronic device, storage medium, and program product

Abstract

The present application provides a time-frequency offset synchronization method, an electronic device, a storage medium, and a program product. The method comprises: a base station sending multiple pieces of time-frequency offset measurement information to a terminal device, each piece of time-frequency offset measurement information being used by the terminal device to perform time-frequency offset measurement on one TRP; when it is determined that the terminal device enters an overlapping area of a plurality of TRPs, sending first instruction information to the terminal device, the first instruction information being used for instructing the terminal device to perform time-frequency offset measurement on the plurality of TRPs; and when it is determined that the terminal device switches to a first TRP among the plurality of TRPs, sending second instruction information to the terminal device, the second instruction information being used for instructing the terminal device to use a time-frequency offset measurement result of the first TRP.

Description

Time-frequency offset synchronization method, electronic device, storage medium and program product

[0001] Cross-reference

[0002] The present application claims priority from the Chinese patent application No. 202410830220.0 entitled "Time-frequency offset synchronization method, electronic device, storage medium and program product" and filed with the China Patent Office on June 25, 2024, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the field of communication technology, and in particular to a time-frequency offset synchronization method, an electronic device, a storage medium and a program product. BACKGROUND

[0004] In a scenario where a terminal device moves at a high speed, a logical cell where a base station is located usually contains multiple transmission reception points (TRPs), and multiple TRPs can simultaneously perform data transmission with the terminal device to ensure service continuity of the terminal device in a moving scenario.

[0005] In related technologies, multiple TRPs can use multiple transmission technologies when performing data transmission with the terminal device, such as dynamic point selection (DPS), joint transmission (JT) and other transmission technologies. In the transmission scheme of DPS, the base station can select a TRP with the best channel quality to perform data transmission with the terminal device based on channel quality indicators (CQIs) of multiple TRPs fed back by the terminal device. In the current DPS strategy, the terminal device can switch from one TRP to another TRP when selecting a TRP, and in this case, the base station needs to reactivate time-frequency offset measurement of the terminal device, and the terminal device also needs to perform time-frequency offset measurement again, thereby affecting data transmission performance of the terminal device. SUMMARY

[0006] The present application provides a time-frequency offset synchronization method, an electronic device, a storage medium and a program product.

[0007] In a first aspect, a time-frequency offset synchronization method is provided, which is applied to a base station and includes: sending multiple sets of time-frequency offset measurement information to a terminal device, each set of time-frequency offset measurement information being used for time-frequency offset measurement of one transmission and reception point (TRP) by the terminal device; in a case where it is determined that the terminal device enters an overlapping area of multiple TRPs, sending first indication information to the terminal device, the first indication information being used for instructing the terminal device to perform time-frequency offset measurement on the multiple TRPs; and in a case where it is determined that the terminal device switches to a first TRP in the multiple TRPs, sending second indication information to the terminal device, the second indication information being used for instructing the terminal device to use a time-frequency offset measurement result of the first TRP.

[0008] In a second aspect, a time-frequency offset synchronization method is provided, which is applied to a terminal device and includes: receiving multiple sets of time-frequency offset measurement information sent by a base station, each set of time-frequency offset measurement information being used for time-frequency offset measurement of one TRP by the terminal device; receiving first indication information sent by the base station, the first indication information being sent by the base station in a case where it is determined that the terminal device enters an overlapping area of multiple TRPs, and the first indication information being used for instructing the terminal device to perform time-frequency offset measurement on the multiple TRPs; performing time-frequency offset measurement on the multiple TRPs according to the first indication information and the time-frequency offset measurement information of the multiple TRPs to obtain a time-frequency offset measurement result; receiving second indication information sent by the base station, the second indication information being sent by the base station in a case where it is determined that the terminal device switches to a first TRP in the multiple TRPs, and the second indication information being used for instructing the terminal device to use the time-frequency offset measurement result of the first TRP for channel demodulation; and using the time-frequency offset measurement result of the first TRP according to the second indication information.

[0009] In a third aspect, an electronic device is provided, which includes a processor, and a memory for storing instructions executable by the processor, wherein the processor is configured to execute the instructions to implement the method according to the first aspect or the second aspect.

[0010] In a fourth aspect, a computer-readable storage medium is provided, which, when instructions stored in the storage medium are executed by a processor of an electronic device, enables the electronic device to perform the method according to the first aspect or the second aspect.

[0011] In a fifth aspect, a computer program product is provided, which includes a non-transitory computer-readable storage medium storing a computer program operable to cause a computer to perform some or all of the steps in the method according to the first aspect, or to perform some or all of the steps in the method according to the second aspect. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description are only some embodiments described in the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0013] FIG. 1 is a schematic diagram of data transmission between a plurality of TRPs adopting DPS and a terminal device according to an embodiment of the present application;

[0014] FIG. 2 is a flowchart of a time-frequency offset synchronization method according to an embodiment of the present application;

[0015] FIG. 3 is a specific format diagram of a MAC CE according to an embodiment of the present application;

[0016] FIG. 4 is a flowchart of a time-frequency offset synchronization method according to an embodiment of the present application;

[0017] FIG. 5 is a schematic diagram of a plurality of TRPs sending TRS to a terminal device according to an embodiment of the present application;

[0018] FIG. 6 is a schematic diagram of QCL types and QCL relationships configured by a base station for a plurality of TRPs according to an embodiment of the present application;

[0019] FIG. 7 is a schematic diagram of a base station instructing a terminal device to activate time-frequency offset measurement and use time-frequency offset measurement results according to an embodiment of the present application;

[0020] FIG. 8 is a specific format diagram of a MAC CE according to an embodiment of the present application;

[0021] FIG. 9 is a structural schematic diagram of an electronic device according to an embodiment of the present application;

[0022] FIG. 10 is a structural schematic diagram of a time-frequency offset synchronization apparatus according to an embodiment of the present application;

[0023] FIG. 11 is a structural schematic diagram of a time-frequency offset synchronization apparatus according to an embodiment of the present application. DETAILED DESCRIPTION

[0024] In a scenario where a terminal device moves at a high speed, a logical cell where a base station is located usually contains multiple TRPs, and the multiple TRPs can use the DPS transmission technology to perform data transmission with the terminal device. As shown in FIG. 1. In FIG. 1, when TRP1 and TRP2 use the DPS transmission technology to perform data transmission with the terminal device, they can send channel state information reference signals (CSI-RSs) to the terminal device, namely, CSI-RS1 and CSI-RS2 shown in FIG. 1. The terminal device can measure the channel quality of TRP1 according to CSI-RS1, measure the channel quality of TRP2 according to CSI-RS2, and report the measurement results to the base station. Assuming that the channel quality of TRP2 is higher than that of TRP1, the base station can select TRP2 to perform data transmission with the terminal device. For example, TRP2 can send a physical downlink shared channel (PDSCH) 2 to the terminal device, and the terminal device can demodulate the PDSCH 2 to implement data transmission with TRP2.

[0025] In actual applications, when the terminal device moves at a high speed, there is usually a time-frequency offset between the terminal device and a TRP. To improve the data transmission performance of the terminal device, the terminal device usually needs to perform time-frequency offset measurement before performing data transmission with the TRP, and perform data transmission with the TRP according to the measurement results, such as time-frequency offset synchronization or channel demodulation. Under the current DPS strategy, when the terminal device switches from one TRP to another TRP, the base station needs to reactivate the time-frequency offset measurement of the terminal device, and the terminal device also needs to perform time-frequency offset measurement again. However, during the time-frequency offset measurement of the terminal device, the time-frequency offset is unknown, so the terminal device cannot use the measurement results to perform data transmission with the TRP, thereby affecting the data transmission performance of the terminal device.

[0026] Embodiments of the present application provide a time-frequency offset synchronization method, an electronic device, a storage medium, and a program product. In a scenario where a terminal device moves at a high speed, a base station can proactively send information for time-frequency offset measurement to the terminal device, and proactively activate the terminal device to perform time-frequency offset measurement on multiple TRPs in a TRP overlapping area when the terminal device enters the TRP overlapping area. Therefore, when the terminal device switches to a certain TRP in the TRP overlapping area, the base station can directly instruct the terminal device to use the time-frequency offset measurement result of the TRP, without activating the time-frequency offset measurement of the terminal device. Correspondingly, the terminal device also does not need to perform time-frequency offset measurement, thereby ensuring the data transmission performance of the terminal device in the TRP overlapping area, and further improving the spectral efficiency and downlink traffic of the downlink and improving the user experience.

[0027] It should be noted that, in the embodiments of the present application, the scenario of high-speed movement of the terminal device can be a scenario in which a user takes a high-speed train, in which case the terminal device used by the user moves at high speed. Of course, the scenario of high-speed movement of the terminal device can also be other scenarios, which will not be illustrated one by one here.

[0028] In order for those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the present application will be clearly and completely described below in combination with the drawings in one or more embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should fall within the protection scope of the present application.

[0029] The terms "first", "second", and the like in the present application and claims are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the present application can be implemented in an order other than those illustrated or described herein. In addition, "and / or" in the present application and claims means at least one of the connected objects, and the character " / " generally means that the front and rear associated objects are in an "or" relationship.

[0030] The technical solutions provided by the embodiments of the present application will be described in detail below in combination with the drawings.

[0031] FIG. 1 is a flow diagram of a time-frequency offset synchronization method according to an embodiment of the present application. The time-frequency offset synchronization method shown in FIG. 1 can be performed by a base station, and can specifically include the following steps.

[0032] Step S202: Send multiple sets of time-frequency offset measurement information to the terminal device, each set of time-frequency offset measurement information being used for the terminal device to perform time-frequency offset measurement on one transmission reception point (TRP).

[0033] In the scenario of high-speed movement of the terminal device, the logical cell in which the base station is located can include multiple transmission reception points (TRPs). In order to obtain time-frequency offset measurement of different TRPs, the base station can send multiple sets of time-frequency offset measurement information to the terminal device, each set of time-frequency offset measurement information corresponding to one TRP and being used for the terminal device to perform time-frequency offset measurement on the one TRP.

[0034] In the embodiments of the present application, the base station sends multiple sets of time-frequency offset measurement information to the terminal device, which can be sent before the terminal device enters the TRP overlapping area. For example, the base station can obtain the location information of the terminal device, and when it is determined that the terminal device enters the coverage range of a certain TRP in multiple TRPs according to the location information of the terminal device, the base station sends multiple sets of time-frequency offset measurement information to the terminal device. Of course, the base station can also send multiple sets of time-frequency offset measurement information to the terminal device at other times before the terminal device enters the TRP overlapping area, which is not limited here.

[0035] The multiple sets of time-frequency offset measurement information can include multiple sets of reference signals and measurement configurations of each set of reference signals, that is, each set of time-frequency offset measurement information can include a set of reference signals and the measurement configuration of the set of reference signals.

[0036] The reference signal can be a signal used by the terminal device to measure the time-frequency offset. In some embodiments, the reference signal can be a tracking reference signal (TRS) or other reference signal, which is not limited here. The reference signals sent by different TRPs can be the same or different.

[0037] The measurement configuration of the reference signal can be configuration information related to time-frequency offset measurement, which can be used to indicate the specific measurement content of the terminal device when performing time-frequency offset measurement. In some embodiments, the measurement configuration of the reference signal can include a quasi co-location (QCL) type, which can be any one of typeA type, typeB type, typeC type and typeD type. The QCL types included in the measurement configurations of different reference signals can be the same or different. Among them, the characteristics of typeA type, typeB type, typeC type and typeD type in the QCL type can be as shown in Table 1.

[0038] Table 1

[0039] In the case where the multiple sets of time-frequency offset measurement information include multiple sets of reference signals and measurement configurations of each set of reference signals, the base station sending multiple sets of time-frequency offset measurement information to the terminal device can include the following steps:

[0040] The base station sends multiple sets of reference signals to the terminal device through a physical downlink channel, and sends the measurement configuration of each set of reference signals to the terminal device through radio resource control (RRC) signaling.

[0041] The physical downlink channel can be a physical downlink control channel (PDCCH) or the like, which is not specifically limited here. When the base station transmits multiple sets of reference signals through the physical downlink channel, in some embodiments, the base station can transmit respective reference signals to the terminal device through the physical downlink channel separately by each TRP. In order to avoid mutual interference between the reference signals of different TRPs, the reference signals transmitted by different TRPs can be staggered in the time-frequency domain.

[0042] Step S204: In the case where it is determined that the terminal device enters the overlapping area of multiple TRPs, first indication information is sent to the terminal device, and the first indication information is used to instruct the terminal device to perform time-frequency offset measurement on the multiple TRPs.

[0043] After the base station sends multiple sets of time-frequency offset measurement information to the terminal device, it can determine whether the terminal device enters the overlapping area of multiple TRPs. In the case where it is determined that the terminal device enters the overlapping area of multiple TRPs, first indication information can be sent to the terminal device, and the first indication information is used to instruct the terminal device to perform time-frequency offset measurement on the multiple TRPs, i.e., the first indication information activates the time-frequency offset measurement of the terminal device on the multiple TRPs.

[0044] When the base station determines whether the terminal device enters the overlapping area of multiple TRPs, there are various specific implementation manners, which are not specifically limited here. For example, the base station can obtain the location information of the terminal device (or the terminal device actively reports its own location information), and determine whether the terminal device enters the overlapping area of multiple TRPs according to the location information of the terminal device and the coverage range of the multiple TRPs, or the terminal device can also report the measurement results of the channel quality of each TRP, and the base station determines whether the terminal device enters the overlapping area of multiple TRPs according to the measurement results.

[0045] The number of multiple TRPs can be 2 or more, which can be determined according to the actual application scenario, which is not specifically limited here. For example, in the scenario where a user takes a high-speed train, the number of multiple TRPs is generally 2, and in special cases, the number of multiple TRPs can be 3.

[0046] In the embodiments of the present application, the terminal device has capability information of time-frequency offset measurement, which can represent the number of time-frequency offset measurements (or measurement configurations) supported by the terminal device, in other words, the capability information can represent the number of TRPs that the terminal device can support for time-frequency offset measurement at the same time. Based on the capability information of the terminal device, when the base station indicates the terminal device to perform time-frequency offset measurement through the first indication information, if the time-frequency offset measurement indicated by the base station exceeds the capability of the terminal device, the terminal device will not be able to perform time-frequency offset measurement on the TRP or the measurement will fail. Therefore, when the base station indicates the terminal device to perform time-frequency offset measurement through the first indication information, the capability information of the terminal device needs to be considered to avoid the problem that the terminal device cannot perform time-frequency offset measurement or the measurement fails.

[0047] In some embodiments, before the base station sends the first indication information to the terminal device, the following steps can be included:

[0048] Receiving the capability information of time-frequency offset measurement sent by the terminal device.

[0049] In this way, the base station sending the first indication information to the terminal device can include: sending the first indication information to the terminal device according to the capability information of the terminal device, and the time-frequency offset measurement indicated by the first indication information matches the capability information of the terminal device.

[0050] The terminal device can send the capability information of time-frequency offset measurement to the base station before the base station issues the first indication information. For example, the terminal device can send the capability information of time-frequency offset measurement to the base station when receiving multiple sets of time-frequency offset measurement information, or the terminal device can send the capability information of time-frequency offset measurement to the base station when accessing the base station. The time when the terminal device sends the capability information is not limited here.

[0051] After receiving the capability information of the terminal device, the base station can send the first indication information to the terminal device according to the capability information, and the time-frequency offset measurement indicated by the first indication information matches the capability information of the terminal device. The match here can be that the number of time-frequency offset measurements indicated by the first indication information is less than or equal to the number of time-frequency offset measurements supported by the terminal device. For example, if the terminal device supports time-frequency offset measurement on 2 TRPs at the same time, the number of time-frequency offset measurements indicated by the first indication information needs to be less than or equal to 2.

[0052] In some embodiments, the base station can also first send the first indication information to the terminal device. After receiving the first indication information, if the time-frequency offset measurement indicated by the first indication information does not match the capability information of the terminal device, the terminal device can report its capability information to the base station. After receiving the capability information reported by the terminal device, the base station can resend the first indication information. The time-frequency offset measurement indicated by the resending first indication information matches the capability information of the terminal device. Thus, the problem that the time-frequency offset measurement indicated by the first indication information does not match the capability information of the terminal device can also be avoided. In actual applications, considering that the base station needs to issue the first indication information to the terminal device twice in this scheme, in order to avoid resource waste, the scheme in which the terminal device first reports its capability information and then the base station issues the first indication information according to the capability information can be preferred.

[0053] It should be noted that in actual applications, the number of the multiple TRPs in the overlapping area can be less than or equal to the number of the time-frequency offset measurements supported by the terminal device, or can be greater than the number of the time-frequency offset measurements supported by the terminal device. In the case that the number of the multiple TRPs in the overlapping area is less than or equal to the number of the time-frequency offset measurements supported by the terminal device, the base station can indicate the terminal device to perform time-frequency offset measurement on the multiple TRPs by sending the first indication information to the terminal device once. In the case that the number of the multiple TRPs in the overlapping area is greater than the number of the time-frequency offset measurements supported by the terminal device, in order to ensure that the time-frequency offset measurement indicated by the base station matches the capability information of the terminal device, the base station cannot indicate the terminal device to perform time-frequency offset measurement on the multiple TRPs by sending the first indication information to the terminal device once. At this time, the base station can select to send multiple first indication information to the terminal device. Each time the first indication information sent can indicate the terminal device to perform measurement on part of the TRPs. Through multiple first indication information, the terminal device can be indicated to perform measurement on multiple TRPs. For example, the base station can first indicate the terminal device to perform time-frequency offset measurement on a number of TRPs with the best signal strength (which matches the capability information of the terminal device) in the multiple TRPs, and then indicate the terminal device to perform measurement on the remaining TRPs with poor signal strength. Alternatively, the base station can also indicate the terminal device to perform time-frequency offset measurement on a number of TRPs (which matches the capability information of the terminal device) consistent with the moving direction of the terminal device in the multiple TRPs, and then indicate the terminal device to perform measurement on the remaining TRPs. Here, the time-frequency offset measurement of the TRPs indicated by the base station in succession is not limited in particular.

[0054] For example, in the scenario of a user taking a high-speed train, assuming that the terminal device used by the user supports simultaneous time-frequency offset measurement on two TRPs, when the terminal device enters the overlapping area of three TRPs, the base station can send two times of first indication information to the terminal device to instruct the terminal device to perform time-frequency offset measurement on the three TRPs. The first indication information sent the first time can instruct the terminal device to perform time-frequency offset measurement on two TRPs with higher intensity among the three TRPs, and the first indication information sent the second time can instruct the terminal device to perform time-frequency offset measurement on the remaining one TRP. Alternatively, the first indication information sent the first time can instruct the terminal device to perform time-frequency offset measurement on one or two TRPs among the three TRPs that are consistent with the moving direction of the terminal device, and the first indication information sent the second time can instruct the terminal device to perform time-frequency offset measurement on the remaining TRP.

[0055] When the base station sends the first indication information to the terminal device, in some embodiments, the following steps can be included:

[0056] The base station sends a medium access control control element (MAC CE) to the terminal device, and the first indication information is carried in the MAC CE.

[0057] That is, the base station can instruct or activate the terminal device to perform time-frequency offset measurement on multiple TRPs through the MAC CE. In some embodiments, the specific format of the MAC CE can be as shown in FIG. 3. In FIG. 3, the Oct1 part is a part that needs to be filled, used to determine the activated cell, BWP ID, and CORESET Pool ID. Each Oct in Oct2- OctN contains 8 bits in length, used to determine the activated time-frequency offset measurement, and the specific number of Octs is ceil (the number of configured Tis / 8). Each Ti can correspond to a TRP, and when Ti takes the value 1, it means that the ith set of time-frequency offset measurement is activated, that is, the terminal device is activated to perform time-frequency offset measurement on the TRP corresponding to the Ti, and when Ti takes the value 0, it means that the ith set of time-frequency offset measurement is not activated, that is, the terminal device is not activated to perform time-frequency offset measurement on the TRP corresponding to the Ti. Ti can be determined by the QCL relationship configured by the base station.

[0058] Step S206: In the case where it is determined that the terminal device switches to a first TRP in the multiple TRPs, second indication information is sent to the terminal device, and the second indication information is used to instruct the terminal device to use the time-frequency offset measurement result of the first TRP.

[0059] The first TRP is one of the plurality of TRPs, and "first" is used to distinguish different TRPs and has no other special meaning. After the base station activates the terminal device to perform time-frequency offset measurement on the plurality of TRPs, it can determine whether the terminal device switches to one of the plurality of TRPs. In the case where it is determined that the terminal device switches to the first TRP of the plurality of TRPs, the base station can send second indication information to the terminal device, and the second indication information indicates that the terminal device uses the time-frequency offset measurement result of the first TRP, such as using the time-frequency offset measurement result of the first TRP for time-frequency offset synchronization or channel demodulation. Thus, when the terminal device performs TRP switching, the base station can directly instruct the terminal device to use the time-frequency offset measurement result of the TRP, and the terminal device does not need to perform time-frequency offset measurement, and accordingly, the terminal device also does not need to perform time-frequency offset measurement again, thereby ensuring the data transmission performance of the terminal device, improving the spectral efficiency and downlink traffic of the downlink, and improving the user experience.

[0060] In some embodiments, the base station sending the second indication information to the terminal device can include the following steps: sending downlink control information (DCI) to the terminal device, and the DCI carries the second indication information.

[0061] That is, the base station can instruct the terminal device to use the time-frequency offset measurement result of the first TRP through the DCI.

[0062] In some embodiments, the base station can also configure a QCL relationship (which can also be referred to as a QCL link relationship) and send the QCL relationship to the terminal device. Specifically, it can include the following steps:

[0063] Establish a QCL relationship between each set of time-frequency offset measurement information and the physical downlink channel of the corresponding TRP to obtain a plurality of QCL relationships corresponding to a plurality of sets of time-frequency offset measurement information;

[0064] Send the plurality of QCL relationships to the terminal device, and the plurality of QCL relationships are used by the terminal device to use the time-frequency offset measurement result of the first TRP.

[0065] The time-frequency offset measurement information here can be a reference signal used for time-frequency offset measurement, such as TRS, etc. The physical downlink channel of the corresponding TRP can be at least one of the PDCCH and the PDSCH of the TRP, and of course, it can also be other physical downlink channels, which are not specifically limited here.

[0066] For each reference signal, the base station can establish a QCL relationship between the reference signal and the physical downlink channel of the corresponding TRP, and thus, a plurality of QCL relationships corresponding to a plurality of reference signals can be obtained. For example, for TRP1, a QCL relationship between the reference signal of TRP1 and the PDCCH and / or PDSCH of TRP1 can be established, and for TRP2, a QCL relationship between the reference signal of TRP2 and the PDCCH and / or PDSCH of TRP2 can be established, and thus, two QCL relationships can be obtained.

[0067] After establishing the plurality of QCL relationships, the base station can send the plurality of QCL relationships to the terminal device. After receiving the plurality of QCL relationships, the terminal device can use the measurement result of the first TRP according to the plurality of QCL relationships. For example, the terminal device can determine a QCL relationship corresponding to the first TRP (which can be denoted as a first QCL relationship) from the plurality of QCL relationships, and then use the time-frequency offset measurement result of the first TRP according to the first QCL relationship. For example, assuming that the first QCL relationship is a QCL relationship between the reference signal of the first TRP and the PDCCH of the first TRP, the terminal device can use the time-frequency offset measurement result of the first TRP to perform channel demodulation on the PDCCH of the first TRP.

[0068] In some embodiments, the base station sending the plurality of QCL relationships to the terminal device can include: sending RRC signaling to the terminal device, and the RRC signaling carrying the plurality of QCL relationships.

[0069] That is, the base station can send the established QCL relationship to the terminal device through RRC signaling.

[0070] In the embodiments of the present application, since the base station can send information for time-frequency offset measurement in advance, and activate the terminal device to perform time-frequency offset measurement on a plurality of TRPs in the TRP overlapping area in advance when the terminal device enters the TRP overlapping area, when the terminal device switches to a certain TRP in the TRP overlapping area, the base station can directly instruct the terminal device to use the previous time-frequency offset measurement result of the TRP, so as to guarantee the data transmission performance of the terminal device, improve the spectral efficiency and downlink traffic of the downlink, and improve the user experience.

[0071] FIG. 4 is a flowchart of a time-frequency offset synchronization method according to an embodiment of the present application. The time-frequency offset synchronization method shown in FIG. 4 can be performed by a terminal device, and can specifically include the following steps.

[0072] Step S402: receiving a plurality of sets of time-frequency offset measurement information sent by a base station, each set of time-frequency offset measurement information being used for the terminal device to perform time-frequency offset measurement on one TRP.

[0073] In a scenario where a terminal device moves at a high speed, a logical cell where a base station is located can include multiple TRPs. In order to obtain time-frequency offset measurement of different TRPs, the base station can send multiple sets of time-frequency offset measurement information to the terminal device, and the terminal device can receive the multiple sets of time-frequency offset measurement information sent by the base station. Each set of time-frequency offset measurement information corresponds to one TRP, and is used for the terminal device to perform time-frequency offset measurement on the one TRP.

[0074] Each set of time-frequency offset measurement information can include a set of reference signals and measurement configuration of each set of reference signals, that is, each set of time-frequency offset measurement information can include a set of reference signals and measurement configuration of the set of reference signals.

[0075] The reference signals can be signals used by the terminal device to measure time-frequency offset. In some embodiments, the reference signals can be TRS or other reference signals, which are not limited here. The reference signals sent by different TRPs can be the same or different.

[0076] The measurement configuration of the reference signals can be configuration information related to time-frequency offset measurement, and can be used to indicate specific measurement content of the terminal device when performing time-frequency offset measurement. In some embodiments, the measurement configuration of the reference signals can include a QCL type, which includes any one of typeA type, typeB type, typeC type and typeD type. The QCL types included in the measurement configurations of different reference signals can be the same or different. The characteristics of the typeA type, the typeB type, the typeC type and the typeD type in the QCL type can refer to the content shown in Table 1 described above, which will not be repeated here.

[0077] In the case where the multiple sets of time-frequency offset measurement information include multiple sets of reference signals and measurement configuration of each set of reference signals, the terminal device receiving the multiple sets of time-frequency offset measurement information sent by the base station can include the following steps:

[0078] The terminal device receives the multiple sets of reference signals sent by the base station through a physical downlink channel, and receives the measurement configuration of each set of reference signals sent by the base station through RRC signaling.

[0079] The physical downlink channel can be PDCCH and the like, which is not limited here.

[0080] Step S404: receiving first indication information sent by the base station, the first indication information being sent by the base station in a case where the base station determines that the terminal device enters an overlapping area of multiple TRPs, and the first indication information being used to instruct the terminal device to perform time-frequency offset measurement on the multiple TRPs.

[0081] After the base station sends multiple sets of time-frequency offset measurement information to the terminal device, in a case where it is determined that the terminal device enters the overlapping area of multiple TRPs, the base station can send first indication information to the terminal device, and the first indication information indicates the terminal device to perform time-frequency offset measurement on the multiple TRPs, that is, the first indication information activates the terminal device to perform time-frequency offset measurement on the multiple TRPs. The terminal device can receive the first indication information sent by the base station.

[0082] In an embodiment of the present application, the terminal device has capability information of time-frequency offset measurement, which can represent the number of time-frequency offset measurements (or measurement configurations) supported by the terminal device, in other words, the capability information can represent the number of TRPs that the terminal device can support to perform time-frequency offset measurement at the same time. Based on the capability information of the terminal device, when the base station indicates the terminal device to perform time-frequency offset measurement through the first indication information, if the time-frequency offset measurement indicated by the base station exceeds the capability of the terminal device, the terminal device will not be able to perform time-frequency offset measurement on the TRP or the measurement will fail. Therefore, in order to avoid the problem that the terminal device cannot perform time-frequency offset measurement on the TRP or the measurement fails, the terminal device can include the following step before receiving the first indication information sent by the base station: sending the capability information of time-frequency offset measurement of the terminal device to the base station.

[0083] The terminal device can send the capability information of time-frequency offset measurement to the base station when receiving multiple sets of time-frequency offset measurement information, or the terminal device can send the capability information of time-frequency offset measurement to the base station when accessing the base station. Here, the time when the terminal device sends the capability information is not limited.

[0084] After receiving the capability information of the terminal device, the base station can send the first indication information to the terminal device according to the capability information, and the time-frequency offset measurement indicated by the first indication information matches the capability information of the terminal device, that is, the number of time-frequency offset measurements indicated by the first indication information is less than or equal to the number of time-frequency offset measurements supported by the terminal device, so that the problem that the terminal device cannot perform time-frequency offset measurement on the TRP or the measurement fails when the time-frequency offset measurement indicated by the first indication information does not match the capability information of the terminal device can be avoided.

[0085] It should be noted that in actual application, the number of the plurality of TRPs in the overlapping area can be less than or equal to the number of the time-frequency offset measurements supported by the terminal device, or can be greater than the number of the time-frequency offset measurements supported by the terminal device. In the case that the number of the plurality of TRPs in the overlapping area is less than or equal to the number of the time-frequency offset measurements supported by the terminal device, the base station can send the first indication information to the terminal device once, and the terminal device can perform the time-frequency offset measurement on the plurality of TRPs according to the first indication information. In the case that the number of the plurality of TRPs in the overlapping area is greater than the number of the time-frequency offset measurements supported by the terminal device, the base station can send the first indication information to the terminal device multiple times, and the terminal device can perform the time-frequency offset measurement on the plurality of TRPs according to the first indication information sent multiple times. The specific implementation of the base station sending the first indication information multiple times can refer to the corresponding content in the embodiment shown in FIG. 2, which will not be described in detail here.

[0086] In some embodiments, the terminal device receiving the first indication information sent by the base station can include the following steps: receiving the MAC CE sent by the base station, and the first indication information is carried in the MAC CE.

[0087] That is, the terminal device can receive the first indication information issued by the base station through the MAC CE. The specific format of the MAC CE can be as shown in FIG. 3.

[0088] Step S406: performing the time-frequency offset measurement on the plurality of TRPs according to the first indication information and the time-frequency offset measurement information of the plurality of TRPs, to obtain the time-frequency offset measurement result.

[0089] After receiving the first indication information, the terminal device can perform the time-frequency offset measurement on the plurality of TRPs according to the first indication information and the plurality of sets of time-frequency offset measurement information received in S402 for performing the time-frequency offset measurement on the plurality of TRPs, to obtain the time-frequency offset measurement result of the plurality of TRPs. The specific implementation of the terminal device performing the time-frequency offset measurement can refer to the specific implementation in the related art, which will not be described in detail here.

[0090] Step S408: receiving the second indication information sent by the base station, the second indication information is sent by the base station in the case that the terminal device is determined to switch to the first TRP in the plurality of TRPs, and the second indication information is used to instruct the terminal device to use the time-frequency offset measurement result of the first TRP.

[0091] The first TRP is one of the plurality of TRPs, and "first" is used here to distinguish different TRPs and has no other special meaning. After the base station activates the terminal device to perform time-frequency offset measurement on the plurality of TRPs, in a case where it is determined that the terminal device switches to the first TRP of the plurality of TRPs, the base station can send second indication information to the terminal device, and the terminal device can use the time-frequency offset measurement result of the first TRP before the time-frequency offset measurement result of the first TRP is indicated by the second indication information. The terminal device can receive the second indication information sent by the base station.

[0092] In some embodiments, the terminal device receiving the second indication information sent by the base station can include the following steps: receiving DCI sent by the base station, and the DCI carrying the second indication information.

[0093] That is, the terminal device can receive the second indication information sent by the base station through the DCI.

[0094] Step S410: using the time-frequency offset measurement result of the first TRP according to the second indication information.

[0095] After receiving the second indication information, the terminal device can use the time-frequency offset measurement result of the first TRP according to the second indication information, such as using the time-frequency offset measurement result of the first TRP for time-frequency offset synchronization or channel demodulation. In this way, since the terminal device can directly use the time-frequency offset measurement result of the TRP before the TRP switching according to the indication information of the base station, it is not necessary to perform time-frequency offset measurement again, so that the data transmission performance of the terminal device can be guaranteed, the spectral efficiency and downlink traffic of the downlink can be improved, and the user experience can be improved.

[0096] In some embodiments, the base station can also configure a QCL relationship (which can also be referred to as a QCL link relationship) and send the QCL relationship to the terminal device, and the terminal device can use the time-frequency offset measurement result of the first TRP according to the QCL relationship configured by the base station. Specifically, it can include the following steps: receiving a plurality of QCL relationships sent by the base station, each QCL relationship being a QCL relationship between a set of time-frequency offset measurement information and a corresponding TRP physical downlink channel; wherein using the time-frequency offset measurement result of the first TRP includes: determining a first QCL relationship from the plurality of QCL relationships, the first QCL relationship being a QCL relationship between the time-frequency offset measurement information of the first TRP and the physical downlink channel of the first TRP; and using the time-frequency offset measurement result of the first TRP according to the first QCL relationship.

[0097] The time-frequency offset measurement information here can be a reference signal used for time-frequency offset measurement, such as TRS, etc. The physical downlink channel of the corresponding TRP can be at least one of the PDCCH and the PDSCH of the TRP, and of course, it can also be other physical downlink channels, which are not limited here.

[0098] After receiving the plurality of QCL relationships, the terminal device can determine a QCL relationship corresponding to the first TRP (which can be denoted as a first QCL relationship) from the plurality of QCL relationships when using the measurement result of the first TRP, and then use the time-frequency offset measurement result of the first TRP according to the first QCL relationship. For example, the first QCL relationship is the QCL relationship between the reference signal of the first TRP and the PDCCH of the first TRP, and the terminal device can use the time-frequency offset measurement result of the first TRP to demodulate the PDCCH of the first TRP.

[0099] In some embodiments, the terminal device receives the plurality of QCL relationships sent by the base station, including: receiving RRC signaling sent by the base station, and the RRC signaling carries the plurality of QCL relationships.

[0100] That is, the terminal device can receive the QCL relationship established by the base station through the RRC signaling.

[0101] In the embodiments of the present application, since the terminal device can receive the information for time-frequency offset measurement sent by the base station in advance, and activate the time-frequency offset measurement of the plurality of TRPs in the TRP overlapping area according to the indication of the base station when entering the TRP overlapping area, when the terminal device switches to a certain TRP in the TRP overlapping area, the terminal device can directly use the time-frequency offset measurement result of the TRP according to the indication of the base station, thereby ensuring the data transmission performance of the terminal device, improving the spectral efficiency and downlink traffic of the downlink, and improving the user experience.

[0102] In order to facilitate understanding of the technical solutions provided in the embodiments of the present application, the following will be described in a more specific embodiment as an example, and specific reference can be made to FIG. 5. In FIG. 5, the logical cell where the base station is located includes six TRPs, which are TRP1, TRP2, TRP3, TRP4, TRP5 and TRP6. The terminal device is in a high-speed moving scenario, and the moving direction is TRP1→TRP2→TRP3→TRP4→TRP5→TRP6. In this scenario, based on the technical solutions provided in the embodiments of the present application, when performing time-frequency offset synchronization, the following steps S1 to S7 can be included.

[0103] Step S1: The base station sends a reference signal TRS for time-frequency offset measurement to the terminal device.

[0104] As shown in FIG. 5, when sending TRS to the terminal device, the 6 TRPs can send respective TRS to the terminal device independently, that is, TRP1 in FIG. 5 sends TRS1 to the terminal device, TRP2 sends TRS2 to the terminal device, TRP3 sends TRS3 to the terminal device, TRP4 sends TRS4 to the terminal device, TRP5 sends TRS5 to the terminal device, and TRP6 sends TRS6 to the terminal device. In order to avoid mutual interference between reference signals of different TRPs, the reference signals between different TRPs can be staggered in the time-frequency domain.

[0105] Step S2: The base station sends a time-frequency offset measurement configuration to the terminal device.

[0106] The base station can send 6 sets of time-frequency offset measurement configurations to the terminal device through RRC signaling, each set of time-frequency offset measurement configuration corresponding to a TRP for time-frequency offset measurement of a TRP. Each set of time-frequency offset measurement configuration can include a QCL type, which can be any one of typeA, typeB, typeC and typeD, and the QCL types of different measurement configurations can be the same or different.

[0107] Step S3: The base station configures multiple QCL relationships for the terminal device.

[0108] The base station can establish a QCL relationship between each set of reference signals and the physical downlink channel (such as PDCCH, PDSCH) of the corresponding TRP, obtain 6 QCL relationships, and then send the 6 QCL relationships to the base station through RRC signaling. The QCL relationship and the time-frequency offset measurement configuration can be sent at the same time, that is, the base station can send 6 sets of time-frequency offset measurement configurations and corresponding 6 QCL relationships to the terminal device through RRC signaling.

[0109] As shown in FIG. 6, the base station can establish a QCL relationship between the reference signal of each TRP and the PDCCH / PDSCH of the TRP, and the QCL type included in the measurement configuration of each TRP is typeA. The base station can send these QCL relationships and QCL types to the terminal device through RRC signaling.

[0110] Step S4: When the base station determines that the terminal device enters the overlapping area of multiple TRPs, the base station sends a MAC CE to the terminal device to activate the terminal device to perform time-frequency offset measurement on multiple TRPs through the MAC CE.

[0111] As shown in FIG. 7, in the process of moving of the terminal device, the base station indicates the terminal device to perform time-frequency offset measurement on TRP1 and TRP2 by MAC CE in the case of determining that the terminal device enters the overlapping area of TRP1 and TRP2. The base station indicates the terminal device to perform time-frequency offset measurement on TRP2 and TRP3 by MAC CE in the case of determining that the terminal device enters the overlapping area of TRP2 and TRP3. The base station indicates the terminal device to perform time-frequency offset measurement on TRP3 and TRP4 by MAC CE in the case of determining that the terminal device enters the overlapping area of TRP3 and TRP4. The base station indicates the terminal device to perform time-frequency offset measurement on TRP4 and TRP5 by MAC CE in the case of determining that the terminal device enters the overlapping area of TRP4 and TRP5. The base station indicates the terminal device to perform time-frequency offset measurement on TRP5 and TRP6 by MAC CE in the case of determining that the terminal device enters the overlapping area of TRP5 and TRP6.

[0112] It should be noted that in this embodiment, the terminal device can support time-frequency offset measurement on 2 TRPs at the same time, and the time-frequency offset measurement indicated by the base station matches the capability information of the terminal device. Wherein, when the base station indicates the terminal device to activate time-frequency offset measurement on 2 TRPs, the specific format of the MAC CE can be as shown in FIG. 8. Taking the case that the base station indicates the terminal device to perform time-frequency offset measurement on TRP1 and TRP2 as an example, the base station can set T0 and T1 in Oct2 to 1, and then send the MAC CE to the terminal device to activate the measurement of TRS1 and TRS2 of the terminal device.

[0113] Step S5: The terminal device performs time-frequency offset measurement on multiple TRPs in the overlapping area according to the indication of the MAC CE.

[0114] As shown in FIG. 7, in the case of entering the overlapping area of TRP1 and TRP2, the terminal device can perform time-frequency offset measurement on TRP1 and TRP2 according to the indication of the MAC CE. In the case of entering the overlapping area of TRP2 and TRP3, the terminal device can perform time-frequency offset measurement on TRP2 and TRP3 according to the indication of the MAC CE. In the case of entering the overlapping area of TRP3 and TRP4, the terminal device can perform time-frequency offset measurement on TRP3 and TRP4 according to the indication of the MAC CE. In the case of entering the overlapping area of TRP4 and TRP5, the terminal device can perform time-frequency offset measurement on TRP4 and TRP5 according to the indication of the MAC CE. In the case of entering the overlapping area of TRP5 and TRP6, the terminal device can perform time-frequency offset measurement on TRP5 and TRP6 according to the indication of the MAC CE.

[0115] The terminal device can perform time-frequency offset measurement according to the reference signal received in S1 and the measurement configuration received in S2. For example, when performing time-frequency offset measurement on TRP1 and TRP2, the Doppler shift, Doppler spread, average delay and delay spread of TRP1 can be measured according to TRS1, and the Doppler shift, Doppler spread, average delay and delay spread of TRP2 can be measured according to TRS2.

[0116] Step S6: When the base station determines that the terminal device enters a certain TRP in the plurality of TRPs, the base station sends DCI to the terminal device, and indicates the terminal device to use the time-frequency offset measurement result of the TRP through the DCI.

[0117] As shown in FIG. 7, in the process of moving the terminal device, when the base station determines that the terminal device is switched from TRP1 to TRP2, it indicates the terminal device to use the time-frequency offset measurement result of TRP2 through DCI. When it determines that the terminal device is switched from TRP2 to TRP3, it indicates the terminal device to use the time-frequency offset measurement result of TRP3 through DCI. When it determines that the terminal device is switched from TRP3 to TRP4, it indicates the terminal device to use the time-frequency offset measurement result of TRP4 through DCI. When it determines that the terminal device is switched from TRP4 to TRP5, it indicates the terminal device to use the time-frequency offset measurement result of TRP5 through DCI. When it determines that the terminal device is switched from TRP5 to TRP6, it indicates the terminal device to use the time-frequency offset measurement result of TRP6 through DCI.

[0118] Step S7: The terminal device uses the time-frequency offset measurement result of a certain TRP according to the indication of the DCI.

[0119] As shown in FIG. 7, when the terminal device is switched from TRP1 to TRP2, it can use the time-frequency offset measurement result of TRP2 according to the indication of the DCI. When it is switched from TRP2 to TRP3, it can use the time-frequency offset measurement result of TRP3 according to the indication of the DCI. When it is switched from TRP3 to TRP4, it can use the time-frequency offset measurement result of TRP4 according to the indication of the DCI. When it is switched from TRP4 to TRP5, it can use the time-frequency offset measurement result of TRP5 according to the indication of the DCI. When it is switched from TRP5 to TRP6, it can use the time-frequency offset measurement result of TRP6 according to the indication of the DCI.

[0120] When the terminal device uses the measurement result of a certain TRP, the terminal device can use the QCL relationship received in S3. For example, when the terminal device uses the time-frequency offset measurement result of TRP2, since the QCL relationship corresponding to TRP2 is the relationship between TRS2 and the PDCCH / PDSCH of TRP2, the terminal device can use the time-frequency offset measurement result of TRP2 to demodulate the channel of the PDCCH / PDSCH of TRP2.

[0121] In the embodiments of the present application, since the base station can issue information for time-frequency offset measurement in advance, and activate the terminal device to perform time-frequency offset measurement on multiple TRPs in the TRP overlapping area when the terminal device enters the TRP overlapping area, when the terminal device switches to a certain TRP in the TRP overlapping area, the base station can directly instruct the terminal device to use the time-frequency offset measurement result of the TRP, thereby ensuring the data transmission performance of the terminal device, improving the spectral efficiency and downlink traffic of the downlink, and improving the user experience.

[0122] The above describes specific embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the acts or steps recited in the claims can be performed in an order other than that described in the embodiments and still achieve desirable results. Additionally, the processes depicted in the figures do not necessarily require the particular order shown or sequential order in order to achieve the desired results. In some implementations, multitasking and parallel processing can be advantageous.

[0123] FIG. 9 is a structural schematic diagram of an electronic device according to an embodiment of the present application. Referring to FIG. 9, at the hardware level, the electronic device includes a processor, and further includes an internal bus, a network interface, and a memory. The memory can include a memory such as a random-access memory (RAM), and can further include a non-volatile memory such as at least one disk memory. Of course, the electronic device can further include other hardware required by a service.

[0124] The processor, the network interface and the memory can be connected with each other through an internal bus, which can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For the convenience of representation, only one bidirectional arrow is used in FIG. 9, but it does not mean that there is only one bus or only one type of bus.

[0125] The memory is configured to store a program. Specifically, the program can include program code including computer operation instructions. The memory can include an internal memory and a non-volatile memory, and provide instructions and data for the processor.

[0126] The processor reads the corresponding computer program from the non-volatile memory into the internal memory and then runs, and forms a time-frequency offset synchronization device at a logical level. The processor executes the program stored in the memory, and is specifically configured to perform the following operations: sending a plurality of sets of time-frequency offset measurement information to a terminal device, each set of time-frequency offset measurement information being used for time-frequency offset measurement of one transmission reception point (TRP) by the terminal device; in a case where it is determined that the terminal device enters an overlapping area of a plurality of TRPs, sending first indication information to the terminal device, the first indication information being used for instructing the terminal device to perform time-frequency offset measurement on the plurality of TRPs; and in a case where it is determined that the terminal device switches to a first TRP in the plurality of TRPs, sending second indication information to the terminal device, the second indication information being used for instructing the terminal device to use a time-frequency offset measurement result of the first TRP.

[0127] Or for performing the following operations: receiving a plurality of sets of time-frequency offset measurement information sent by a base station, each set of time-frequency offset measurement information being used for time-frequency offset measurement of one TRP by the terminal device; receiving first indication information sent by the base station, the first indication information being sent by the base station in a case where the base station determines that the terminal device enters an overlapping area of a plurality of TRPs, and the first indication information being used for instructing the terminal device to perform time-frequency offset measurement on the plurality of TRPs; performing time-frequency offset measurement on the plurality of TRPs according to the first indication information and the time-frequency offset measurement information of the plurality of TRPs to obtain a time-frequency offset measurement result; receiving second indication information sent by the base station, the second indication information being sent by the base station in a case where the base station determines that the terminal device switches to a first TRP in the plurality of TRPs, and the second indication information being used for instructing the terminal device to use the time-frequency offset measurement result of the first TRP; and using the time-frequency offset measurement result of the first TRP according to the second indication information.

[0128] The method performed by the time-frequency offset synchronization device disclosed in the embodiment shown in FIG. 9 of the present application can be applied to a processor or implemented by the processor. The processor can be an integrated circuit chip having a signal processing capability. In the implementation process, each step of the above method can be completed by integrated logic circuits or instructions in software form of the hardware in the processor. The processor can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; or a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. Each method, step and logic block diagram disclosed in the present application can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can be any conventional processor. The steps of the method disclosed in the present application can be directly embodied as a hardware coding processor for execution, or a combination of hardware and software modules in the coding processor for execution. The software module can be located in a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, or other mature storage media in the art. The storage medium is located in the storage memory, and the processor reads the information in the storage memory and combines the hardware to complete the steps of the above method.

[0129] The electronic device can also execute the method of FIG. 2 or FIG. 4 and implement the functions of the time-frequency offset synchronization apparatus in the embodiments of FIG. 2 or FIG. 4, which will not be repeated here.

[0130] Of course, in addition to the software implementation, the electronic device of the present application does not exclude other implementations, such as logic devices or a combination of software and hardware, and so on, that is, the execution subject of the following processing flow is not limited to the logical unit, but can also be hardware or logic devices.

[0131] The present application also provides a computer readable storage medium storing one or more programs, the one or more programs including instructions that, when executed by a portable electronic device including a plurality of applications, can cause the portable electronic device to execute the method of the embodiments of FIG. 2 or FIG. 4, and specifically for performing the following operations: sending a plurality of sets of time-frequency offset measurement information to a terminal device, each set of time-frequency offset measurement information being used for time-frequency offset measurement of one transmission reception point (TRP) by the terminal device; in a case where it is determined that the terminal device enters an overlapping area of a plurality of TRPs, sending first indication information to the terminal device, the first indication information being used to instruct the terminal device to perform time-frequency offset measurement on the plurality of TRPs; in a case where it is determined that the terminal device switches to a first TRP in the plurality of TRPs, sending second indication information to the terminal device, the second indication information being used to instruct the terminal device to use the time-frequency offset measurement result of the first TRP.

[0132] or for performing the following operations: receiving a plurality of sets of time-frequency offset measurement information sent by a base station, each set of time-frequency offset measurement information being used for time-frequency offset measurement of one TRP by the terminal device; receiving first indication information sent by the base station, the first indication information being sent by the base station in a case where it is determined that the terminal device enters an overlapping area of a plurality of TRPs, the first indication information being used to instruct the terminal device to perform time-frequency offset measurement on the plurality of TRPs; performing time-frequency offset measurement on the plurality of TRPs according to the first indication information and the time-frequency offset measurement information of the plurality of TRPs to obtain a time-frequency offset measurement result; receiving second indication information sent by the base station, the second indication information being sent by the base station in a case where it is determined that the terminal device switches to a first TRP in the plurality of TRPs, the second indication information being used to instruct the terminal device to use the time-frequency offset measurement result of the first TRP;

[0133] using the time-frequency offset measurement result of the first TRP according to the second indication information.

[0134] FIG. 10 is a structural schematic diagram of a time-frequency offset synchronization apparatus 100 in an embodiment of the present application. Referring to FIG. 10, in a software implementation, the time-frequency offset synchronization apparatus 100 can include a first sending module 101, a second sending module 102, and a third sending module 103, wherein: the first sending module 101 sends a plurality of sets of time-frequency offset measurement information to a terminal device, each set of time-frequency offset measurement information being used for time-frequency offset measurement of one transmission and reception point (TRP) by the terminal device; the second sending module 102, in a case where it is determined that the terminal device enters an overlapping area of a plurality of TRPs, sends first indication information to the terminal device, the first indication information being used for instructing the terminal device to perform time-frequency offset measurement on the plurality of TRPs; and the third sending module 103, in a case where it is determined that the terminal device switches to a first TRP in the plurality of TRPs, sends second indication information to the terminal device, the second indication information being used for instructing the terminal device to use a time-frequency offset measurement result of the first TRP.

[0135] In some embodiments, the plurality of sets of time-frequency offset measurement information includes a plurality of sets of reference signals and measurement configuration of each set of reference signals; and the first sending module 101 sends the plurality of sets of time-frequency offset measurement information to the terminal device, including: sending the plurality of sets of reference signals to the terminal device through a physical downlink channel; and sending the measurement configuration of each set of reference signals to the terminal device through radio resource control (RRC) signaling.

[0136] In some embodiments, the measurement configuration of each set of reference signals includes a quasi co-location (QCL) type, and the QCL type includes any one of a type A, a type B, a type C, and a type D.

[0137] In some embodiments, the apparatus 100 further includes a receiving module, which receives capability information of time-frequency offset measurement sent by the terminal device before the second sending module 102 sends the first indication information to the terminal device; and the second sending module 102 sends the first indication information to the terminal device, including: sending the first indication information to the terminal device according to the capability information, the time-frequency offset measurement indicated by the first indication information matching the capability information.

[0138] In some embodiments, the second sending module 102 sends the first indication information to the terminal device, including: sending a medium access control (MAC) control element (CE) to the terminal device, the first indication information being carried in the MAC CE.

[0139] In some embodiments, the third sending module 103 sends the second indication information to the terminal device, including: sending downlink control information (DCI) to the terminal device, wherein the DCI carries the second indication information.

[0140] In some embodiments, the first sending module 101 further establishes a QCL relationship between each set of time-frequency offset measurement information and a corresponding physical downlink channel of a TRP, to obtain a plurality of QCL relationships corresponding to the plurality of sets of time-frequency offset measurement information; and sends the plurality of QCL relationships to the terminal device, which are used by the terminal device to use the time-frequency offset measurement result of the first TRP.

[0141] In some embodiments, the first sending module 101 sends the plurality of QCL relationships to the terminal device, including: sending RRC signaling to the terminal device, wherein the RRC signaling carries the plurality of QCL relationships.

[0142] The time-frequency offset synchronization device 100 provided in the present application can also perform the method of FIG. 2 and realize the functions of the time-frequency offset synchronization device 100 in the embodiment shown in FIG. 2, which will not be described herein again.

[0143] FIG. 11 is a structural schematic diagram of a time-frequency offset synchronization device 110 according to an embodiment of the present application. Please refer to FIG. 11. In a software embodiment, the time-frequency offset synchronization device 110 can include a first receiving module 111, a second receiving module 112, a measurement module 113, a third receiving module 114, and a processing module 115, wherein: the first receiving module 111 receives a plurality of sets of time-frequency offset measurement information sent by a base station, each set of time-frequency offset measurement information being used by a terminal device to perform time-frequency offset measurement on one TRP; the second receiving module 112 receives first indication information sent by the base station, the first indication information being sent by the base station when it is determined that the terminal device enters an overlapping area of a plurality of TRPs, and the first indication information being used to instruct the terminal device to perform time-frequency offset measurement on the plurality of TRPs; the measurement module 113 performs time-frequency offset measurement on the plurality of TRPs according to the first indication information and the time-frequency offset measurement information of the plurality of TRPs, to obtain a time-frequency offset measurement result; the third receiving module 114 receives second indication information sent by the base station, the second indication information being sent by the base station when it is determined that the terminal device switches to a first TRP in the plurality of TRPs, and the second indication information being used to instruct the terminal device to use the time-frequency offset measurement result of the first TRP; and the processing module 115 uses the time-frequency offset measurement result of the first TRP according to the second indication information.

[0144] In some embodiments, the multiple sets of time-frequency offset measurement information comprise multiple sets of reference signals and measurement configurations of each set of reference signals; the first receiving module 111 receives multiple sets of time-frequency offset measurement information sent by the base station, comprising: receiving the multiple sets of reference signals sent by the base station through a physical downlink channel; receiving the measurement configuration of each set of reference signals sent by the base station through RRC signaling.

[0145] In some embodiments, the measurement configuration of each set of reference signals comprises a QCL type, and the QCL type comprises any one of a type A type, a type B type, a type C type and a type D type.

[0146] In some embodiments, the time-frequency offset measurement indicated by the first indication information matches the capability information of the time-frequency offset measurement of the terminal device; the apparatus 110 further comprises a sending module, which sends the capability information of the time-frequency offset measurement of the terminal device to the base station before the second receiving module 112 receives the first indication information sent by the base station.

[0147] In some embodiments, the second receiving module 112 receives the first indication information sent by the base station, comprising: receiving the MAC CE sent by the base station, wherein the first indication information is carried in the MAC CE.

[0148] In some embodiments, the third receiving module 114 receives the second indication information sent by the base station, comprising: receiving the DCI sent by the base station, wherein the second indication information is carried in the DCI.

[0149] In some embodiments, the first receiving module 111 further receives multiple QCL relationships sent by the base station, each QCL relationship being a QCL relationship between a set of time-frequency offset measurement information and a corresponding physical downlink channel of a TRP; wherein the processing module 115 uses the time-frequency offset measurement result of the first TRP, comprising: determining a first QCL relationship from the multiple QCL relationships, the first QCL relationship being a QCL relationship between the time-frequency offset measurement information of the first TRP and the physical downlink channel of the first TRP; using the time-frequency offset measurement result of the first TRP according to the first QCL relationship.

[0150] In some embodiments, the first receiving module 111 receives multiple QCL relationships sent by the base station, comprising: receiving RRC signaling sent by the base station, wherein the multiple QCL relationships are carried in the RRC signaling.

[0151] The time-frequency offset synchronization apparatus 110 provided in the present application can also perform the method of FIG. 4 and realize the functions of the time-frequency offset synchronization apparatus 110 in the embodiment shown in FIG. 4, which will not be repeated here.

[0152] The application further provides a computer program product, which comprises a non-transitory computer-readable storage medium storing a computer program capable of operating a computer to perform some or all of the steps in the above-mentioned time-frequency offset synchronization method embodiments.

[0153] In summary, the above merely describes preferred embodiments of the present application, but should not be used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0154] The systems, apparatuses, modules or units illustrated by the above embodiments can be specifically implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer. Specifically, the computer may, for example, be a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an e-mail device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0155] The computer readable medium includes permanent and non-permanent, removable and non-removable media, which can be implemented by any method or technology to store information. The information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible to computing devices. According to the definition herein, computer readable medium does not include transitory media such as modulated data signals and carriers.

[0156] It should also be noted that the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusion, so that processes, methods, articles or devices including a series of elements not only include those elements, but also include other elements not explicitly listed or inherent to such processes, methods, articles or devices. Without more limitations, the element defined by the statement "including a" does not exclude the presence of additional identical elements in the process, method, article or device including the element.

[0157] The various embodiments in this application are described in a progressive manner, and the same or similar parts among the various embodiments can be referred to each other. Each embodiment focuses on the difference from other embodiments. In particular, the system embodiments are described in a relatively simple manner because they are substantially similar to the method embodiments, and the relevant parts can be referred to the description of the method embodiments.

Claims

1.A time-frequency offset synchronization method applied to a base station, comprising: sending, to a terminal device, a plurality of sets of time-frequency offset measurement information, each set of time-frequency offset measurement information being used for time-frequency offset measurement of one transmission reception point (TRP) by the terminal device; in a case where it is determined that the terminal device enters an overlapping area of a plurality of TRPs, sending, to the terminal device, first indication information used for instructing the terminal device to perform time-frequency offset measurement on the plurality of TRPs; in a case where it is determined that the terminal device switches to a first TRP in the plurality of TRPs, sending, to the terminal device, second indication information used for instructing the terminal device to use a time-frequency offset measurement result of the first TRP. 2.The method of claim 1, wherein the plurality of sets of time-frequency offset measurement information comprises a plurality of sets of reference signals and measurement configurations of each set of reference signals, and the sending, to the terminal device, of the plurality of sets of time-frequency offset measurement information comprises: sending, to the terminal device, the plurality of sets of reference signals through a physical downlink channel; and sending, to the terminal device, the measurement configurations of each set of reference signals through radio resource control (RRC) signaling. 3.The method of claim 2, wherein the measurement configuration of each set of reference signals comprises a quasi co-location (QCL) type, and the QCL type comprises any one of a type A, a type B, a type C, and a type D. 4.The method of claim 1, wherein before the sending, to the terminal device, of the first indication information, the method further comprises: receiving, from the terminal device, capability information of time-frequency offset measurement; and the sending, to the terminal device, of the first indication information comprises: sending, to the terminal device, the first indication information according to the capability information, the first indication information indicating time-frequency offset measurement matching the capability information. 5.The method of claim 1 or 4, wherein the sending, to the terminal device, of the first indication information comprises: sending, to the terminal device, a medium access control (MAC) control element (CE) carrying the first indication information. 6.The method of claim 1, wherein the sending, to the terminal device, of the second indication information comprises: sending, to the terminal device, a downlink control information (DCI) carrying the second indication information. 7.The method of claim 1, further comprising: establishing a quasi co-location (QCL) relationship between each set of time-frequency offset measurement information and a physical downlink channel of a corresponding TRP to obtain a plurality of QCL relationships corresponding to the plurality of sets of time-frequency offset measurement information; and sending, to the terminal device, the plurality of QCL relationships, the plurality of QCL relationships being used by the terminal device to use the time-frequency offset measurement result of the first TRP. 8.The method of claim 7, wherein the sending, to the terminal device, of the plurality of QCL relationships comprises: sending, to the terminal device, radio resource control (RRC) signaling carrying the plurality of QCL relationships. 9.A time-frequency offset synchronization method applied to a terminal device, comprising: ​ ​ ​ receive a plurality of sets of time-frequency offset measurement information sent by the base station, each set of time-frequency offset measurement information being used for time-frequency offset measurement of one TRP by the terminal device; receive first indication information sent by the base station, the first indication information being sent by the base station in a case where the base station determines that the terminal device enters an overlapping area of a plurality of TRPs, and the first indication information being used for instructing the terminal device to perform time-frequency offset measurement on the plurality of TRPs; perform time-frequency offset measurement on the plurality of TRPs according to the first indication information and the time-frequency offset measurement information of the plurality of TRPs, to obtain time-frequency offset measurement results; receive second indication information sent by the base station, the second indication information being sent by the base station in a case where the base station determines that the terminal device switches to a first TRP in the plurality of TRPs, and the second indication information being used for instructing the terminal device to use the time-frequency offset measurement result of the first TRP; use the time-frequency offset measurement result of the first TRP according to the second indication information. 10.The method of claim 9, wherein the plurality of sets of time-frequency offset measurement information comprises a plurality of sets of reference signals and measurement configuration of each set of reference signals; and the receiving the plurality of sets of time-frequency offset measurement information sent by the base station comprises: receiving the plurality of sets of reference signals sent by the base station through a physical downlink channel; and receiving the measurement configuration of each set of reference signals sent by the base station through RRC signaling. 11.The method of claim 10, wherein the measurement configuration of each set of reference signals comprises a QCL type, and the QCL type comprises any one of a type A type, a type B type, a type C type and a type D type. 12.The method of claim 9, wherein the time-frequency offset measurement indicated by the first indication information matches capability information of time-frequency offset measurement of the terminal device; and before receiving the first indication information sent by the base station, the method further comprises: sending the capability information of time-frequency offset measurement of the terminal device to the base station. 13.The method of claim 9, wherein the receiving the first indication information sent by the base station comprises: receiving a MAC CE sent by the base station, wherein the first indication information is carried in the MAC CE. 14.The method of claim 9, wherein the receiving the second indication information sent by the base station comprises: receiving a DCI sent by the base station, wherein the second indication information is carried in the DCI. 15.The method of claim 9, further comprising: receiving a plurality of QCL relationships sent by the base station, each QCL relationship being a QCL relationship between one set of time-frequency offset measurement information and a physical downlink channel of a corresponding TRP; and wherein the using the time-frequency offset measurement result of the first TRP comprises: determining a first QCL relationship from the plurality of QCL relationships, the first QCL relationship being a QCL relationship between the time-frequency offset measurement information of the first TRP and a physical downlink channel of the first TRP; and using the time-frequency offset measurement result of the first TRP according to the first QCL relationship. ​ ​ ​ ​ ​ ​ ​ ​ ​ 16.The method of claim 15, wherein the receiving the plurality of QCL relationships transmitted by the base station comprises: receiving RRC signaling transmitted by the base station, the RRC signaling carrying the plurality of QCL relationships. 17.An electronic device comprising: a processor; a memory for storing instructions executable by the processor; wherein the processor is configured to execute the instructions to implement the method of any one of claims 1-16. 18.A computer-readable storage medium storing instructions that, when executed by a processor of an electronic device, cause the electronic device to perform the method of any one of claims 1-16. 19.A computer program product comprising a non-transitory computer-readable storage medium storing a computer program operable to cause a computer to perform some or all of the steps of the method of any one of claims 1-16.

Images