TWI784342B - Method for determining clock bias, computing device and computer storage medium - Google Patents

Abstract

The invention discloses a clock deviation determining method, a computing device and a computer storage medium, which are used to reduce the clock deviation between base stations, thereby improving the positioning accuracy. On the terminal side, a method for determining a clock offset provided by an embodiment of the present invention includes: acquiring the configuration signaling of the first downlink positioning reference signal PRS, and receiving and measuring the configuration signaling from the reference signal based on the configuration signaling of the first downlink PRS. The first downlink PRS of the base station and the non-reference base station; determine and send the first clock offset between the reference base station and the non-reference base station based on the first downlink PRS, so that the first clock offset is received The node confirms a second clock skew based on the first clock skew.

Description

Method for determining clock bias, computing device and computer storage medium

The invention belongs to the technical field of communication, and in particular relates to a method for determining a clock deviation, a computing device and a computer storage medium.

The 3rd Generation Partnership Project (3rd Generation Partnership Project, 3GPP) defines a variety of user terminal (User Terminal, UE) positioning methods by measuring its own positioning reference signal (Positioning Reference Signal, PRS) of the 3GPP wireless communication system, such as Downlink observed time difference of arrival (Observed Time Difference Of Arrival, OTDOA), uplink time difference of arrival (Uplink Time Difference Of Arrival, UTDOA) and so on. The characteristics of these methods are based on the PRS positioning of the wireless communication system itself, and can work in an environment where the external positioning reference signal of the network cannot be received.

Embodiments of the present invention provide a method for determining a clock bias, a computing device, and a computer storage medium, which are used to reduce clock bias between base stations, thereby improving positioning accuracy.

On the terminal side (applicable to both the reference terminal and the target terminal), a method for determining a clock offset provided by an embodiment of the present invention includes: Acquiring the configuration signaling of the first downlink positioning reference signal PRS, and receiving and measuring the first downlink PRS from the reference base station and the non-reference base station based on the configuration signaling of the first downlink PRS; Determine and send a first clock offset between the reference base station and the non-reference base station based on the first downlink PRS, so that a node receiving the first clock offset confirms a second clock offset based on the first clock offset.

By this method, the configuration signaling of the first downlink positioning reference signal PRS is obtained, and based on the configuration signaling of the first downlink PRS, the first downlink PRS from the reference base station and the non-reference base station is received and measured; determining and sending a first clock offset between the reference base station and the non-reference base station based on the first downlink PRS, so that the node receiving the first clock offset confirms a second clock offset based on the first clock offset, The clock skew between base stations is reduced, thereby improving positioning accuracy.

Optionally, the first clock offset is sent to a location management function LMF entity or a non-reference base station.

Correspondingly, on the terminal side (applicable to the target terminal), a method for determining a clock offset provided by an embodiment of the present invention includes: receiving a first clock offset between the reference base station and the non-reference base station; wherein the first clock offset is obtained by the first terminal by measuring the first downlink positioning reference signal PRS from the reference base station and the non-reference base station definite; Based on the first clock offset, a second clock offset is determined.

Optionally, before determining the second clock offset based on the first clock offset, the method further includes: acquiring configuration signaling of a second downlink positioning reference signal PRS, and receiving and measuring based on the configuration signaling of the second downlink PRS A second downlink PRS from a reference base station and a non-reference base station; determining a first positioning measurement value based on the second downlink PRS; After determining the second clock offset based on the first clock offset, the method further includes: correcting the first positioning measurement value based on the second clock offset to obtain a second positioning measurement value.

Optionally, the method also includes: Positioning is performed based on the second positioning measurement value.

Optionally, based on the first clock deviation, determining the second clock deviation specifically includes: Based on the first clock offset and predefined criteria, a second clock offset is determined.

Optionally, the predefined criteria include one or a combination of the following calculation criteria: arithmetic mean, optimal value of selected channel conditions, and weighted average.

Optionally, the first clock offset is obtained by the location management function LMF entity receiving the first clock offset reported by the first UE, and forwarding the first clock offset to the second UE.

Correspondingly, on the network side, a method for determining a clock offset provided by an embodiment of the present invention includes: sending configuration signaling of the first downlink PRS to the first terminal, and sending configuration signaling of the second downlink PRS to the second terminal; receiving the first clock offset between the reference base station and the non-reference base station reported by the first terminal and/or the second terminal; Based on the first clock offset, a second clock offset is determined.

Optionally, based on the first clock deviation, determining the second clock deviation specifically includes: The first clock offset is forwarded to the second terminal, and the second terminal determines the second clock offset based on the first clock offset.

Optionally, the method also includes: Based on the second clock offset, the first positioning measurement value reported by the second terminal is corrected to obtain the second positioning measurement value.

Optionally, the method also includes: Positioning is performed based on the second positioning measurement value.

Optionally, the method further includes: based on the second clock offset, correcting the clock offset of the non-reference base station relative to the reference base station.

Optionally, before sending the configuration signaling of the first downlink PRS to the first terminal and sending the configuration signaling of the second downlink PRS to the second terminal, the method further includes: receiving the configuration signaling of the first downlink PRS signal and configuration signaling of the second downlink PRS signal; based on the configuration signaling of the first downlink PRS signal, sending the first downlink PRS signal to the first terminal; After correcting the clock deviation of the non-reference base station relative to the reference base station, the method further includes: sending the second downlink PRS signal to the second terminal based on the configuration signaling of the second downlink PRS signal.

Optionally, the receiving the configuration signaling of the first downlink PRS signal and the configuration signaling of the second downlink PRS signal specifically includes: The configuration signaling of the first downlink PRS signal and the configuration signaling of the second downlink PRS signal sent by the location management function LMF entity are received.

Optionally, based on the first clock deviation, determining the second clock deviation specifically includes: Based on the first clock offset and predefined criteria, a second clock offset is determined.

Optionally, the predefined criteria include one or a combination of the following calculation criteria: arithmetic mean, optimal value of selected channel conditions, and weighted average.

Optionally, the method also includes: Send the configuration signaling of the first downlink PRS signal to the reference base station and the non-reference base station, and send the configuration signaling of the second downlink PRS signal to the reference base station and the non-reference base station.

Corresponding to the above method, on the terminal side (applicable to both the reference terminal and the target terminal), a terminal provided by an embodiment of the present invention includes a transceiver, a processor, and a memory: a transceiver for receiving and transmitting data under the control of the processor; The processor is used to read the program in the memory and perform the following processes: Acquiring the configuration signaling of the first downlink positioning reference signal PRS, and receiving and measuring the first downlink PRS from the reference base station and the non-reference base station based on the configuration signaling of the first downlink PRS; Determine and send a first clock offset between the reference base station and the non-reference base station based on the first downlink PRS, so that a node receiving the first clock offset confirms a second clock offset based on the first clock offset.

Correspondingly, when the terminal provided by the embodiment of the present invention is used as a target terminal, it includes a transceiver, a processor and a memory: a transceiver for receiving and transmitting data under the control of the processor; The processor is also used to read programs in memory and perform the following processes: Receive the first clock deviation between the reference base station and the non-reference base station through the transceiver; wherein, the first clock deviation is obtained by the first terminal by measuring the first downlink from the reference base station and the non-reference base station Determined by the positioning reference signal PRS; Based on the first clock offset, a second clock offset is determined.

On the network side, an apparatus for determining a clock offset provided by an embodiment of the present invention includes a transceiver, a processor, and a memory: a transceiver for receiving and transmitting data under the control of the processor; The processor is used to read the program stored in the memory and perform the following processes: sending configuration signaling of the first downlink PRS to the first terminal through the transceiver, and sending configuration signaling of the second downlink PRS to the second terminal; receiving the first clock offset between the reference base station and the non-reference base station reported by the first terminal and/or the second terminal through the transceiver; Based on the first clock offset, a second clock offset is determined.

Another embodiment of the present invention provides a computer storage medium, which stores computer-executable instructions, and the computer-executable instructions are used to make the computer execute any one of the above-mentioned methods.

The present invention obtains the configuration signaling of the first downlink positioning reference signal PRS, and receives and measures the first downlink PRS from the reference base station and the non-reference base station based on the configuration signaling of the first downlink PRS; The first downlink PRS determines and sends the first clock offset between the reference base station and the non-reference base station, so that the node receiving the first clock offset confirms the second clock offset based on the first clock offset, thereby The calibration scheme of the clock deviation between the base stations is realized, the clock deviation between the base stations is reduced, thereby improving the positioning accuracy.

In order for the Ligui Examiner to understand the technical features, content and advantages of the present invention and the effects it can achieve, the present invention is hereby combined with the accompanying drawings and appendices, and is described in detail in the form of embodiments as follows, and the drawings used therein , the purpose of which is only for illustration and auxiliary instructions, and not necessarily the true proportion and precise configuration of the present invention after implementation, so it should not be interpreted based on the proportion and configuration relationship of the attached drawings, and limit the application of the present invention in actual implementation The scope is described first.

In describing the present invention, it is to be understood that the terms "center", "lateral", "upper", "lower", "left", "right", "top", "bottom", "inner", " The orientations or positional relationships indicated in the drawings are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, Specific orientation configurations and operations, therefore, are not to be construed as limitations on the invention.

It should be noted that the PRS described in the embodiment of the present invention refers to all reference signals that can be used to measure the Time of Arrival (TOA), such as PRS that can be used for traditional OTDOA/UTDOA positioning, channel status indication reference signal (Channel State Indication Reference Signal, CSI-RS), Sounding Reference Signal (Sounding Reference Signal, SRS), etc.

There are several basic ways to use TOA for positioning: Non-differential mode: directly use TOA to calculate UE position without using differential technology.

Differential method: First, make a difference on TOA to eliminate some common deviations in the measured values, and then use TOA after the difference to calculate the UE position. There are two types of differential methods: single differential and double differential.

Single differential method: Select a certain transmitter (or receiver) as the reference terminal, and then make a difference between the measured values related to other transmitters (or receivers) and the measured values related to the reference terminal. The purpose of single differential is to eliminate measurement bias at one end (receiving or transmitting). For example, the time difference of arrival (Time Difference Of Arrival, TDOA) of 3GPP OTDOA positioning (that is, the reference signal time difference (Reference Signal Time Difference, RSTD)) measurement value is the TOA measurement value related to the UE and each base station and the UE and a certain It is obtained by performing a difference on the TOA measurement value related to the reference base station, and the purpose of the difference is to eliminate the influence of the UE clock deviation on the positioning.

Double differential method: The measured value after the single differential method is differentiated again to simultaneously eliminate measurement errors related to the transmitting end and the receiving end, such as the clock deviation of the base station (Base Station, BS) and UE. For example, the double-difference technology can be used in downlink positioning scenarios. At this time, there are multiple sending ends (base stations) and two receiving ends, one of which is a reference receiving end whose location is known. The other receiving end is a UE whose location is unknown. At this time, the two receivers are connected to the positioning signal sent by the base station at the same time, and the double difference technology is used to eliminate the common error related to the transmitter and the receiver in the measured values of the two receivers, and then the position of the unknown receiver is accurately calculated. The influence of the time and frequency synchronization deviation between the base stations on the positioning accuracy can be eliminated by adopting the double differential method.

To sum up, the non-differential method is affected by the clock offset of UE and base station at the same time, and the clock offset of UE is much larger than the clock offset of base station, so it has not been adopted by 3GPP. The double differential method has the following disadvantages: first, it requires a reference receiver to be specially installed at a known location, which has a negative impact on the implementation of the specific system; second, it requires the target UE and the reference UE to simultaneously locate the downlink PRS signal Measurement and reporting of positioning measurement values increase the processing complexity of the reference UE; thirdly, there may be a problem of reference UE switching for double-difference when the reference UE is in motion and the target UE is in motion. The single difference method is currently used for the RSTD measurement value of 3GPP OTDOA positioning (the calculation method of the RSTD measurement value is the TOA measurement value related to the target UE and all BSs, and the difference between the TOA measurement value related to the UE and a reference BS). The single-difference method can eliminate the influence of the UE clock bias on the positioning accuracy, but the clock bias between base stations will directly affect the positioning accuracy of the single-difference method.

According to the above analysis, it can be seen that for the single-difference method, the time synchronization deviation between base stations is the key that directly affects the positioning accuracy of the single-difference method. A time synchronization method between base stations requires a base station to monitor the PRS of an adjacent base station. Then, based on the detected arrival time of the PRS, the transmission time of the PRS and the known distance between the two base stations, the clock bias between the two base stations is estimated. The estimated clock skew between the two base stations can be used to compensate for the impact of the clock skew between the base stations on the OTDOA or UTDOA positioning algorithm. The effectiveness of the method is limited by the fact that PRSs are only sent periodically due to resource usage constraints; and that the estimated accuracy of the clock offset between two base stations based on a single sent PRS is limited. The maximum value of the clock deviation between the base stations of the time division duplex (time division duplex, TDD) system is plus or minus 50 ns. The clock deviation will greatly affect the UE positioning accuracy of the OTDOA or UTDOA positioning technical solution.

Therefore, in the wireless communication user terminal positioning system, the clock deviation between base stations (ie time synchronization error) is one of the key issues that directly affect the positioning performance. The technical solution provided by the embodiments of the present invention proposes a clock offset calibration method and device based on a TDOA measurement value.

Among them, the method and the device are conceived based on the same application. Since the principle of solving problems of the method and the device is similar, the implementation of the device and the method can be referred to each other, and the repetition will not be repeated.

The technical solutions provided by the embodiments of the present invention can be applied to various systems, especially 5G systems. For example, the applicable system may be a global system of mobile communication (GSM) system, a code division multiple access (code division multiple access, CDMA) system, a wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) universal Packet radio service (general packet radio service, GPRS) system, long term evolution (long term evolution, LTE) system, LTE frequency division duplex (frequency division duplex, FDD) system, LTE TDD, universal mobile telecommunications system, UMTS), worldwide interoperability for microwave access (WiMAX) system, 5G system, and 5G New Radio (NR) system, etc. These various systems include end devices and network devices.

The terminal device involved in the embodiment of the present invention may be a device that provides voice and/or data connectivity to a user, a handheld device with a wireless connection function, or other processing devices connected to a wireless modem. In different systems, the name of the terminal equipment may be different. For example, in a 5G system, the terminal equipment may be called user equipment (user equipment, UE). Wireless terminal equipment can communicate with one or more core networks via RAN, and wireless terminal equipment can be mobile terminal equipment, such as mobile phones (or called "cellular" phones) and computers with mobile terminal equipment, for example, can be Portable, pocket, palmtop, built-in or vehicle-mounted mobile devices that exchange language and/or data with a wireless access network. For example, personal communication service (PCS) phones, cordless phones, session initiated protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants, PDA) and other devices. Wireless terminal equipment can also be called system, subscriber unit, subscriber station, mobile station, mobile station, remote station, access point ), remote terminal equipment (remote terminal), access terminal equipment (access terminal), user terminal equipment (user terminal), user agent (user agent), user device (user device), the embodiment of the present invention is not limited.

The network device involved in the embodiment of the present invention may be a base station, and the base station may include multiple cells. Depending on the specific application, the base station can also be called an access point, or it can refer to a device in the access network that communicates with wireless terminal equipment through one or more magnetic zones on the air interface, or other names. The network device can be used to convert received air frames to and from Internet Protocol (IP) packets and act as a router between the wireless terminal device and the rest of the access network, which can Includes Internet Protocol (IP) communications networks. Network devices may also coordinate attribute management for the air interface. For example, the network equipment involved in the embodiment of the present invention may be a network equipment (base transceiver station, BTS) in GSM or code division multiple access (code division multiple access, CDMA), or a bandwidth code division multiple access (CDMA) It can also be the network equipment (NodeB) in wide-band code division multiple access (WCDMA), or the evolved network equipment (evolutional node B, eNB or e-NodeB) in the long-term evolution system LTE, 5G The 5G base station in the network architecture (next generation system) can also be a home evolved node B (HeNB), a relay node (relay node), a home base station (femto), a pico base station (pico) etc. are not limited in the embodiments of the present invention.

Various embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that the display order of the embodiments of the present invention only represents the sequence of the embodiments, and does not represent the advantages or disadvantages of the technical solutions provided by the embodiments.

The technical solutions provided by the embodiments of the present invention include: First, the first UE (that is, the reference UE) and/or the second UE (that is, the target UE) measures the downlink positioning reference signal PRS from the reference base station and the non-reference base station to obtain the first positioning measurement value (that is, the TDOA measurement value ), and further calculate to obtain the first clock offset between the reference base station and the non-reference base station.

It should be noted that in the OTDOA positioning technology solution, the UE needs to measure the time difference between the downlink reference signals of two downlink base stations and the UE to obtain the TDOA measurement value, and establish more than two TDOA hyperbolic equations to solve the two hyperbolic equations. The intersection point of the curves is used as the UE position to be solved. Among them, the common base stations in multiple TDOA hyperbolic equations are called reference base stations, and other base stations are called non-reference base stations. The target UE is a UE whose geographic location is unknown and needs to perform location calculation. A reference UE is a UE with a known geographical location that is used to measure and determine the clock offset between a reference base station and a non-reference base station.

Then, the first UE and/or the second UE respectively report the first clock offset to different objects in one of the following three ways and perform subsequent processing.

Method 1), the first UE and/or the second UE report the first clock offset feedback to the location management server, that is, the location management function (Location Management Function, LMF) entity, and the LMF determines the second clock offset, and then the LMF Based on the second clock offset, correct the first positioning measurement value TDOA (that is, RSTD) fed back by the second UE to obtain the second positioning measurement value, and then perform positioning calculation based on the second positioning measurement value (for example: downlink positioning based on OTDOA calculation or UTDOA-based uplink positioning calculation).

Mode 2), the first UE reports the first clock offset feedback to the LMF, and the LMF forwards the first clock offset to the second UE, and then the second UE determines the second clock offset based on the first clock offset, and the target UE A positioning measurement value TDOA (that is, RSTD) is corrected to obtain a second positioning measurement value, and then downlink positioning based on OTDOA is performed based on the corrected second positioning measurement value.

Method 3), the first UE and/or the second UE feed back the first clock offset to the non-reference base station, the non-reference base station determines the second clock offset based on the first clock offset, and the non-reference base station determines the second clock offset based on the second clock offset Correct the second clock deviation of itself relative to the reference base station, and then the reference base station and the non-reference base station respectively send the downlink PRS signal to the second UE; the second UE further receives and measures the downlink PRS signal, and then performs downlink based on the downlink OTDOA positioning calculations.

Wherein, the first UE may be a UE dedicated for positioning measurement, or a regular UE; the positioning reference signal PRS may be any downlink signal, including but not limited to: NR PRS, NR carrier phase positioning reference signal (Carrier phase Positioning Reference Signal , C-PRS), synchronization signal block (Synchronization Signal Block, SSB) and channel state indication reference signal (Channel State Indication Reference Signal, CSI-RS), etc.; LMF can be based on the first clock offset fed back by multiple reference UEs, based on A predefined criterion determines the second clock offset, where the predefined criterion includes, but is not limited to, calculation criteria such as an arithmetic mean, an optimal value of a selected channel condition, and a weighted average.

According to different processing methods after the first UE and/or the second UE report the first clock offset, the embodiment of the present invention includes the following three solutions.

Solution 1: Clock offset calibration solution processed by LMF, UE-assisted positioning.

In scheme 1, scheme 1 is adopted for subsequent processing of the first clock offset reported by the first UE and/or the second UE.

First, the first UE (that is, the reference UE) and/or the second UE (that is, the target UE) measures the downlink positioning reference signal PRS from the reference base station and the non-reference base station to obtain the first positioning measurement value (that is, the TDOA measurement value ), and further calculate the first clock offset between the reference base station and the non-reference base station based on the first positioning measurement value.

Then, the first UE and/or the second UE implements the first clock offset and the subsequent processing after the reporting by adopting mode 1.

Method 1): The first UE and/or the second UE report the first clock offset feedback to the LMF, and the LMF determines the second clock offset, and the LMF returns the first positioning measurement value for the second UE based on the second clock offset TDOA (that is, RSTD) is corrected to obtain a second positioning measurement value, and then positioning calculation is performed based on the second positioning measurement value (for example: downlink positioning calculation based on OTDOA or uplink positioning calculation based on UTDOA).

Wherein, the first UE may be a UE dedicated to positioning measurement, or a regular UE; the positioning reference signal PRS may be any downlink signal, including but not limited to: NR PRS, NR C-PRS, SSB, and CSI-RS; The LMF may determine the second clock offset based on a predefined criterion based on the first clock offset fed back by multiple reference UEs, where the predefined criterion includes but is not limited to an arithmetic mean, an optimal value of selected channel conditions, and a weighted average.

As shown in FIG. 1 , base station i is a reference base station, and base station j is a non-reference base station. The first UE a and the first UE b are reference UEs dedicated for positioning measurement; the second UE c is a target UE.

The clock offset determination method on the first UE (reference UE) side includes: Step 1: The first UE receives configuration signaling of the first downlink PRS signal; Wherein, the first downlink PRS can be any downlink signal, including but not limited to NR PRS, NR C-PRS, SSB and CSI-RS, and the configuration signaling can be positioning-specific signaling from LMF, or from Broadcast signaling of the serving base station, UE-specific RRC signaling or DCI signaling; Step 2: The first UE obtains the first clock offset between the reference base station and the non-reference base station by receiving and measuring the first downlink PRS signal of the reference base station and the non-reference base station; Step 3: The first UE reports the first clock offset to the LMF.

The clock offset determination method on the second UE (target UE) side includes: Step 1: The second UE receives configuration signaling of the first downlink PRS and the second downlink PRS; wherein, the first downlink PRS and the second downlink PRS can be any downlink signals, including but not limited to NR PRS, NR C- PRS, SSB and CSI-RS, the configuration signaling can be positioning-specific signaling from the LMF, broadcast signaling from the serving base station, UE-specific RRC signaling or DCI signaling; Step 2: The second UE obtains the first clock offset between the reference base station and the non-reference base station by receiving and measuring the first downlink PRS signal of the reference base station and the non-reference base station; Step 3: The second UE reports the first clock offset to the LMF; Step 4: The second UE obtains the first positioning measurement value TDOA (RSTD) by receiving and measuring the second downlink PRS signal of the reference base station and the non-reference base station; Step 5: The second UE reports the above-mentioned first positioning measurement value to the LMF.

The methods for determining the clock bias of the reference base station and the non-reference base station include: Step 1: The reference base station and the non-reference base station receive configuration signaling of the first downlink PRS signal and configuration signaling of the second downlink PRS signal; Wherein, any of the configuration signaling is a positioning-specific signaling from the LMF; Step 2: The reference base station and the non-reference base station send the first downlink PRS signal to all the first UE and the second UE; Step 3: The reference base station and the non-reference base station send the second downlink PRS signal to all the second UEs.

Correspondingly, the processing methods on the LMF side include: Step 1: The LMF sends the configuration signaling of the first downlink PRS signal to the first UE and the second UE, sends the configuration signaling of the second downlink PRS signal to the second UE, and sends the configuration signaling of the second downlink PRS signal to the reference base station and the non-reference base station Configuration signaling of the first downlink PRS signal, sending configuration signaling of the second downlink PRS signal to the reference base station and the non-reference base station; wherein, any of the above configuration signaling can be sent at the same time or sequentially, and the implementation of the present invention The example does not limit the execution order of each step in the steps; Step 2: The LMF receives the first clock offset reported by the first UE and/or the second UE, and determines the second clock offset based on the first clock offset and a predefined criterion; Among them, the predefined criteria include, but are not limited to, arithmetic mean, optimal value of selected channel conditions and weighted mean; Step 3: Based on the second clock deviation, the LMF corrects the first positioning measurement value TDOA (that is, RSTD) fed back by the target UE and obtains the second positioning measurement value; Step 4: The LMF performs positioning based on the corrected second positioning measurement value, for example: a positioning scheme based on OTDOA or UTDOA.

Scheme 2: The LMF notifies the target UE of the clock offset calibration scheme and UE-based positioning.

In scheme 2, the subsequent processing of reporting the first clock offset by the first UE and/or the second UE adopts the foregoing manner 2).

First, the first UE (namely the reference UE) and/or the second UE (namely the target UE) obtains the first positioning measurement value (ie TDOA measurement) by measuring the downlink positioning reference signal PRS from the reference base station and the non-reference base station value), and further calculate the first clock offset between the reference base station and the non-reference base station based on the first positioning measurement value.

Then, the first UE and/or the second UE adopt the method 2) to realize the reporting of the first clock offset and subsequent subsequent processing: Mode 2): The first UE reports the first clock offset feedback to the LMF, and then the LMF forwards the first clock offset to the second UE, and then the second UE determines the second clock offset based on the first clock offset, and the target UE targets The first positioning measurement value TDOA (that is, RSTD) is corrected to obtain a second positioning measurement value, and then downlink positioning based on OTDOA is performed based on the corrected second positioning measurement value.

Wherein, the first UE may be a UE dedicated to positioning measurement, or a regular UE; the positioning reference signal PRS may be any downlink signal, including but not limited to: NR PRS, NR C-PRS, SSB, and CSI-RS; The LMF may determine the second clock offset based on a predefined criterion based on the first clock offset fed back by multiple reference UEs, where the predefined criterion includes but is not limited to an arithmetic mean, an optimal value of selected channel conditions, and a weighted average.

As shown in FIG. 2 , base station i is a reference base station, and base station j is a non-reference base station. The first UE a and the first UE b are reference UEs dedicated for positioning measurement; the second UE c is a target UE.

The clock offset determination method on the first UE (reference UE) side includes: Step 1: The first UE receives configuration signaling of the first downlink PRS signal; Wherein, the first downlink PRS can be any downlink signal, including but not limited to NR PRS, NR C-PRS, SSB and CSI-RS, and the configuration signaling can be positioning-specific signaling from LMF, or from Broadcast signaling of the serving base station, UE-specific RRC signaling or DCI signaling; Step 2: The first UE obtains the first clock offset between the reference base station and the non-reference base station by receiving and measuring the first downlink PRS signal of the reference base station and the non-reference base station; Step 3: The first UE reports the first clock offset to the LMF.

The clock offset determination method on the second UE (target UE) side includes: Step 1: The second UE receives configuration signaling of the second downlink PRS signal; Wherein, the second downlink PRS can be any downlink signal, including but not limited to NR PRS, NR C-PRS, SSB and CSI-RS, and the configuration signaling can be positioning-specific signaling from LMF, or from the service Broadcast signaling of the base station, UE-specific RRC signaling or DCI signaling; Step 2: The second UE obtains the first positioning measurement value TDOA (that is, RSTD) by receiving and measuring the second downlink PRS signal of the reference base station and the non-reference base station; Step 3: The second UE receives the first clock offset about the reference base station and the non-reference base station forwarded by the LMF, and determines the second clock offset based on predefined criteria, wherein the predefined criteria include but not limited to arithmetic mean, channel selection Conditional optimum and weighted average; Step 4: Based on the second clock deviation, the second UE corrects the first positioning measurement value TDOA (that is, RSTD) measured in Step 2 and obtains the second positioning measurement value; Step 5: The second UE performs downlink positioning based on the corrected second positioning measurement value, for example: based on UE-based OTDOA and/or carrier phase positioning scheme.

The methods for determining the clock bias of the reference base station and the non-reference base station include: Step 1: The reference base station and the non-reference base station receive configuration signaling of the first downlink PRS signal and configuration signaling of the second downlink PRS signal; Wherein, any one of the configuration signaling is a positioning-specific signaling from the LMF; Step 2: The reference base station and the non-reference base station send the first downlink PRS signal to all the first UEs; Step 3: The reference base station and the non-reference base station send the second downlink PRS signal to all the second UEs.

The methods for determining the clock skew on the LMF side include: Step 1: The LMF sends the configuration signaling of the first downlink PRS signal to the first UE, sends the configuration signaling of the second downlink PRS signal to the second UE, and sends the first downlink PRS to the reference base station and the non-reference base station The signal configuration signaling is to send the configuration signaling of the second downlink PRS signal to the reference base station and the non-reference base station; wherein, the above configuration signaling can be sent simultaneously or sequentially. In the embodiment of the present invention, there is no limitation on the execution order of each step in this step; Step 2: The LMF receives the first clock offset reported by the first UE, and forwards the first clock offset to the second UE.

Scheme 3: Non-reference base station correction clock offset calibration scheme, UE-assisted positioning.

In Solution 3, the subsequent processing of reporting the first clock offset by the first UE and/or the second UE adopts the above-mentioned method 3).

First, the first UE (that is, the reference UE) and/or the second UE (that is, the target UE) measures the downlink positioning reference signal PRS from the reference base station and the non-reference base station to obtain the first positioning measurement value (that is, the TDOA measurement value ), and further calculate the first clock offset between the reference base station and the non-reference base station based on the first positioning measurement value.

Then, the first UE and/or the second UE implement the above method 3) to report the first clock offset and subsequent subsequent processing.

Mode 3): The first UE and/or the second UE feed back the first clock offset to the non-reference base station, the non-reference base station determines the second clock offset based on the first clock offset, and the non-reference base station determines the second clock offset based on the second clock offset Correct the second clock deviation of itself relative to the reference base station, and then the reference base station and the non-reference base station respectively send the downlink PRS signal to the second UE; the second UE further receives and measures the downlink PRS signal, and then performs based on the downlink OTDOA Downlink positioning calculation.

Wherein, the first UE may be a UE dedicated to positioning measurement, or a regular UE; the positioning reference signal PRS may be any downlink signal, including but not limited to: NR PRS, NR C-PRS, SSB, and CSI-RS; The LMF may determine the second clock bias based on the first clock bias fed back by multiple reference UEs, and further determine the second clock bias based on a predefined criterion, where the predefined criterion includes but not limited to an arithmetic mean, an optimal value of selected channel conditions, and a weighted mean.

As shown in FIG. 3 , base station i is a reference base station, and base station j is a non-reference base station. The first UE a and the first UE b are reference UEs dedicated for positioning measurement; the second UE c is a target UE.

The clock offset determination method on the first UE (reference UE) side includes: Step 1: The first UE receives configuration signaling of the first downlink PRS signal; Wherein, the first downlink PRS can be any downlink signal, including but not limited to NR PRS, NR C-PRS, SSB and CSI-RS, and the configuration signaling can be positioning-specific signaling from LMF, or from Broadcast signaling of the serving base station, UE-specific RRC signaling or DCI signaling; Step 2: At the first moment (for example, T1), the first UE obtains the first downlink PRS signal between the reference base station and the non-reference base station by receiving and measuring the first downlink PRS signal of the reference base station and the non-reference base station. clock skew; Step 3: The first UE reports the first clock offset to the non-reference base station.

The clock offset determination method on the second UE (target UE) side includes: Step 1: The second UE receives configuration signaling of the first downlink PRS and configuration signaling of the second downlink PRS; Wherein, the first downlink PRS and the second downlink PRS may be any downlink signals, including but not limited to NR PRS, NR C-PRS, SSB and CSI-RS, and the configuration signaling may be positioning-specific signaling from LMF , may also be broadcast signaling from the serving base station, UE-specific RRC signaling or DCI signaling; Step 2: At the first moment (for example, T1), the second UE obtains the first downlink PRS signal between the reference base station and the non-reference base station by receiving and measuring the first downlink PRS signal of the reference base station and the non-reference base station. clock skew; Step 3: The second UE reports the first clock offset to the non-reference base station; Step 4: At a second moment (for example, T2), the second UE receives and measures the second downlink PRS signal sent by the reference base station and the non-reference base station, and obtains the first positioning measurement value TDOA (ie RSTD); Step 5: The second UE reports the above-mentioned first positioning measurement value TDOA to the LMF.

Correspondingly, the clock bias determination method on the reference base station side includes: Step 1: The reference base station receives configuration signaling of the first downlink PRS signal and configuration signaling of the second downlink PRS signal; Wherein, any one of the configuration signaling is a positioning-specific signaling from the LMF; Step 2: at time T1, the reference base station sends the first downlink PRS signal to all the first UEs; Step 3: At time T2, the reference base station sends the second downlink PRS signal to all the second UEs.

Correspondingly, the method for determining the clock bias on the non-reference base station side includes: Step 1: The non-reference base station receives configuration signaling of the first downlink PRS signal and configuration signaling of the second downlink PRS signal; Wherein, any one of the configuration signaling is a positioning-specific signaling from the LMF; Step 2: At time T1, the non-reference base station sends the first downlink PRS signal to all the first UEs; Step 3: The non-reference base station receives the first clock offset fed back by multiple reference UEs, and further determines the second clock offset based on the first clock offset and predefined criteria, where the predefined criteria include but not limited to arithmetic mean, channel selection Conditional optimum and weighted average; Step 4: The non-reference base station corrects its own second clock deviation relative to the reference base station based on the second clock deviation; Step 5: At time T2, the non-reference base station sends a second downlink PRS signal to all second UEs after correcting its own second clock offset relative to the reference base station.

It should be noted that the sending of the second downlink PRS signal to all second UEs in the embodiment of the present invention is only a preferred embodiment, and is not limited thereto, and the second downlink PRS signal may also be sent to some second UEs. Signal.

The methods for determining the clock skew on the LMF side include: Step 1: The LMF sends the configuration signaling of the first downlink PRS signal to the first UE and the second UE, sends the configuration signaling of the second downlink PRS signal to the second UE, and sends the configuration signaling of the second downlink PRS signal to the reference base station and the non-reference base station The configuration signaling of the first downlink PRS signal is sent to the reference base station and the non-reference base station. The second configuration signaling of the downlink PRS signal can be sent simultaneously or sequentially. In the embodiment of the present invention, there is no limitation on the execution order of each step in this step; Step 2: The LMF receives the second positioning measurement value TDOA (ie RSTD) reported by the first UE; Step 3: The LMF performs downlink positioning based on the second positioning measurement value, for example: a positioning solution based on OTDOA.

Further detailed descriptions of specific embodiments are given below.

Example 1: Embodiment 1 explains the first UE and LMF of the above scheme 1, wherein the first UE (ie, the reference UE) is a UE dedicated to positioning measurement, including UE a and UE b; the first positioning fed back by the target UE c The measured value is TDOA (that is, RSTD); the positioning reference signal PRS is NR PRS; base station i is a reference base station, and base station j is a non-reference base station.

；同理，可得第一UE b關於參考基地台i和非參考基地台j之間的第一時鐘偏差

。The clock offset determination method on the first UE (reference UE) side includes: Step 1: The first UE a and the first UE b receive configuration signaling of the first downlink PRS signal; wherein, the first downlink PRS is NR PRS, The configuration signaling can be positioning-specific signaling from the LMF, broadcast signaling from the serving base station, UE-specific RRC signaling or DCI signaling; Step 2: The first UE a receives and measures the reference base station i and the first downlink PRS signal of non-reference base station j, and obtain the first clock offset between reference base station i and non-reference base station j

; Similarly, the first UE b can be obtained with respect to the first clock offset between the reference base station i and the non-reference base station j

.

通過測量參考基地台（發送端）

發送的PRS信號獲得的TOA測量值為

，則

在時刻k可以表達如下：

(1)Set reference UE (receiving end)

By measuring the reference base station (transmitter)

The TOA measurement obtained from the transmitted PRS signal is

,but

At time k can be expressed as follows:

(1)

表示以米為單位的TOA測量值，

是參考基地台i和參考UE a之間的理想距離，可由已知的基地台位置和參考UE a的位置得出。c是光速，取值為3.0*10^8（米/秒），

和

分別是UE a和參考基地台i的時鐘偏差（即時間同步誤差），

是參考基地台

對應的TOA測量誤差。in,

represents the TOA measurement in meters,

is the ideal distance between reference base station i and reference UE a, which can be obtained from the known base station location and reference UE a location. c is the speed of light, the value is 3.0*10^8 (m/s),

with

are the clock deviations of UE a and reference base station i (i.e. time synchronization error),

is the reference base station

Corresponding TOA measurement error.

通過測量非參考基地台

發送的PRS信號獲得的TOA測量值為

：

(2)Let reference UE

By measuring non-reference base stations

The TOA measurement obtained from the transmitted PRS signal is

:

(2)

是非參考基地台j的時鐘偏差（即時間同步誤差），

是非參考基地台

對應的TOA測量誤差。in,

is the clock bias (i.e. time synchronization error) of the non-reference base station j,

non-reference base station

Corresponding TOA measurement error.

針對參考基地台i和非參考基地台j的單差分TOA（即TDOA）值為：

(3)The above two formulas can be subtracted: at time k, refer to UE

The single-difference TOA (i.e. TDOA) value for reference base station i and non-reference base station j is:

(3)

表示在時刻k、參考基地台i和非參考基地台j之間的時鐘偏差，

表示參考UE a與參考基地台i以及參考基地台j之間的理想距離差，其中，

是參考基地台i和參考UE a之間的理想距離，

是參考基地台j和參考UE a之間的理想距離；

=

-

是單差分TOA測量誤差，

是參考基地台

對應的TOA測量誤差，

是參考基地台

對應的TOA測量誤差。in,

Denotes the clock offset between reference base station i and non-reference base station j at time k,

Indicates the ideal distance difference between reference UE a and reference base station i and reference base station j, where,

is the ideal distance between reference base station i and reference UE a,

is the ideal distance between reference base station j and reference UE a;

=

-

is the single differential TOA measurement error,

is the reference base station

The corresponding TOA measurement error,

is the reference base station

Corresponding TOA measurement error.

和

，因此，可以計算得到理想距離差

，代入上面公式（3）可得在時刻k的基地台i和基地台j的第一時鐘偏差估計值

：

(4)For a reference UE a, its absolute position and ideal distances from base station i and base station j are known

with

, therefore, the ideal distance difference can be calculated

, substituting the above formula (3) to obtain the estimated value of the first clock bias of base station i and base station j at time k

:

(4)

進行平均抑制雜訊處理，得到參考UE a估計的參考基地台i和非參考基地台j的第一時鐘偏差值

。

(5)through multiple moments

Perform average noise suppression processing to obtain the first clock offset value of reference base station i and non-reference base station j estimated by reference UE a

.

(5)

Wherein, K is a positive integer greater than or equal to 1.

，計算過程參見實施例1的公式（1）到公式（5）。Similarly, the first clock offset values of reference base station i and non-reference base station j estimated by reference UE b can be obtained

, refer to formula (1) to formula (5) of embodiment 1 for the calculation process.

和

上報給LMF，用於LMF進行時鐘偏差校準和後續UE定位計算。Step 3: The first UE a and the first UE b respectively put the above-mentioned first clock offset estimation value

with

It is reported to the LMF for the LMF to perform clock offset calibration and subsequent UE positioning calculation.

和

，基於預定義準則確定第二時鐘偏差

。其中，

為參考UE a上報的第一時鐘偏差估計值，

為參考UE b上報的第一時鐘偏差估計值。The clock offset determination method on the LMF side includes: Step 1: The LMF sends configuration signaling of the first downlink PRS signal to the first UE, sends configuration signaling of the second downlink PRS signal to the second UE, and sends the configuration signaling of the second downlink PRS signal to the reference base station and non- The reference base station sends the configuration signaling of the first downlink PRS signal, and sends the configuration signaling of the second downlink PRS signal to the reference base station and the non-reference base station; wherein, the above configuration signaling can be sent simultaneously or sequentially, The embodiment of the present invention does not limit the execution order of each step in the steps; Step 2: The LMF receives the first estimated clock offset value reported by the first UE

with

, to determine the second clock skew based on a predefined criterion

. in,

is the first clock offset estimated value reported by reference UE a,

is the first clock offset estimated value reported by reference UE b.

，預定義準則至少有以下三種計算方法： Option1：算術平均，例如：

； Option2：選擇通道條件最優（例如：參考信號接收功率(Reference Signal Receive Power，RSRP)和/或信幹噪比（Signal to Interference plus Noise Ratio， SINR）最大的UE的通道條件最優）的參考UE的時鐘偏差作為第二時鐘偏差

，例如：參考UE a的RSRP和/或SINR分別大於參考UE b的RSRP和/或SINR，即參考UE a的RSRP大於參考UE b的RSRP，和/或，參考UE a的SINR大於參考UE b的SINR，則選擇

；反之，選擇

； Option3：加權平均，例如：

，其中，

是介於0到1之間的加權係數，可以根據UE a和UE b的通道條件來確定

取值。Combined with the first clock offset reported by two first UEs (including reference UE a and reference UE b), the LMF can calculate a more accurate second clock offset between base station i and base station j:

, the predefined criterion has at least the following three calculation methods: Option1: Arithmetic mean, for example:

; Option2: Select the channel with the best channel condition (for example: the channel condition of the UE with the largest Reference Signal Received Power (Reference Signal Receive Power, RSRP) and/or Signal to Interference plus Noise Ratio (SINR) is the best) The clock bias of the reference UE is used as the second clock bias

, for example: the RSRP and/or SINR of the reference UE a are respectively greater than the RSRP and/or SINR of the reference UE b, that is, the RSRP of the reference UE a is greater than the RSRP of the reference UE b, and/or the SINR of the reference UE a is greater than the reference UE b SINR, choose

; otherwise, choose

; Option3: weighted average, for example:

,in,

is a weighting coefficient between 0 and 1, which can be determined according to the channel conditions of UE a and UE b

value.

In Embodiment 1, Option1 is used.

，針對目標UE c回饋的第一定位測量值（TDOA）

進行修正，並得到第二定位測量值

。Step 3: LMF is based on the second clock skew

, the first positioning measurement value (TDOA) fed back for the target UE c

Make a correction and get a second positioning measurement

.

為：

(6)Assume that the LMF receives the first positioning measurement value (TDOA) of the reference base station i and the non-reference base station j reported by the target UE c

for:

(6)

，採用下面公式針對第一定位測量值（TDOA）

進行修正：

(7)LMF is based on the second clock skew

, using the following formula for the first positioning measurement (TDOA)

Make a correction:

(7)

=

。Among them, suppose

=

.

針對目標UE c進行下行定位獲得目標UE c的實際位置，例如：採用基於OTDOA的定位方案。Step 4: LMF is based on the corrected second positioning measurement

Downlink positioning is performed on the target UE c to obtain the actual location of the target UE c, for example, an OTDOA-based positioning scheme is adopted.

The maximum value of the clock deviation between the base stations of the existing TDD system is plus or minus 50 ns. After the above processing, the residual clock deviation can be made to be about 10 ns.

Example 2: Embodiment 2 explains the first UE and the second UE of scheme 2, wherein the first UE (that is, the reference UE) is a UE dedicated to positioning measurement, including UE a and UE b; the first UE measured by the target UE c A positioning measurement value is TDOA (that is, RSTD); the positioning reference signal PRS is NR PRS; base station i is a reference base station, and base station j is a non-reference base station.

；同理可得第一UE b關於參考基地台i和非參考基地台j之間的第一時鐘偏差

。其中，第一時鐘偏差

和

的計算過程參見實施例1的公式（1）到公式（5）； Step 3：第一UE a和 第一UE b分別把上述第一時鐘偏差估計值

和

上報給LMF，用於LMF把該第一時鐘偏差轉發給第二UE c。The clock offset determination method on the first UE (reference UE) side includes: Step 1: The first UE a and the first UE b receive configuration signaling of the first downlink PRS signal; wherein, the first downlink PRS is NR PRS, The configuration signaling can be positioning-specific signaling from the LMF, broadcast signaling from the serving base station, UE-specific RRC signaling or DCI signaling; Step 2: The first UE a receives and measures the reference base station i and the first downlink PRS signal of non-reference base station j, and obtain the first clock offset between reference base station i and non-reference base station j

; In the same way, the first UE b can obtain the first clock offset between the reference base station i and the non-reference base station j

. where the first clock skew

with

For the calculation process, please refer to formula (1) to formula (5) in embodiment 1; Step 3: the first UE a and the first UE b respectively calculate the above-mentioned first clock offset estimated value

with

Report to the LMF for the LMF to forward the first clock offset to the second UE c.

和

，並基於預定義的準則確定第二時鐘偏差

。The clock offset determination method on the second UE (target UE) side includes: Step 1: The second UE c receives configuration signaling of a second downlink PRS signal; wherein, the second downlink PRS is NR PRS, and the configuration signaling may be from Positioning-specific signaling based on LMF can also be broadcast signaling from the serving base station, UE-specific RRC signaling or DCI signaling; Step 2: The second UE c receives and measures the first position of the reference base station and the non-reference base station Two downlink PRS signals to obtain the first positioning measurement value (ie TDOA (RSTD)); Step 3: The second UE c receives the reference base station and non-reference base station measured by the first UE a and the first UE b forwarded by the LMF station's first clock skew estimate

with

, and determine the second clock skew based on a predefined criterion

.

，至少有以下三種計算方法： Option1：算術平均，例如：

。 Option2：選擇通道條件最優（例如：RSRP和/或SINR最大的UE的通道條件最優）的參考UE的時鐘偏差作為第二時鐘偏差

，例如：參考UE a的RSRP和/或SINR大於參考UE b的RSRP和/或SINR，即參考UE a的RSRP大於參考UE b的RSRP，和/或，參考UE a的SINR大於參考UE b的SINR，則選擇

；反之，選擇

； Option3：加權平均，例如：

，其中，

是介於0到1之間的加權係數，可以根據UE a和UE b的通道條件來確定

取值。The second UE c can calculate a more accurate second clock between base station i and base station j based on the first clock deviation measured by the two first UEs (ie reference UE a and reference UE b) forwarded by the LMF deviation:

, there are at least the following three calculation methods: Option1: Arithmetic mean, for example:

. Option2: Select the clock offset of the reference UE with the best channel condition (for example: the channel condition of the UE with the largest RSRP and/or SINR is the best) as the second clock offset

, for example: the RSRP and/or SINR of the reference UE a is greater than the RSRP and/or SINR of the reference UE b, that is, the RSRP of the reference UE a is greater than the RSRP of the reference UE b, and/or the SINR of the reference UE a is greater than that of the reference UE b SINR, select

; otherwise, choose

; Option3: weighted average, for example:

,in,

is a weighting coefficient between 0 and 1, which can be determined according to the channel conditions of UE a and UE b

value.

In Embodiment 2, Option2 is used.

，針對Step2測量的第一定位測量值（TDOA）

進行修正，並得到第二定位測量值

。Step 4: The second UE is based on the second clock offset

, the first positioning measurement (TDOA) measured for Step2

Make a correction and get a second positioning measurement

.

測量的基地台i和基地台j的第一定位測量值（TDOA）

為：

(6)Suppose the second UE (target UE)

Measured first location measurements (TDOA) of base station i and base station j

for:

(6)

，採用下面公式針對第一定位測量值（TDOA）

進行修正：

(7)The second UE is based on the second clock offset

, using the following formula for the first positioning measurement (TDOA)

Make a correction:

(7)

。Among them, suppose

.

Step 5: The second UE performs downlink positioning based on the second positioning measurement value obtained after correction, for example, an OTDOA-based positioning solution.

The maximum value of the clock deviation between the base stations of the existing TDD system is plus or minus 50 ns. After the above processing, the residual clock deviation can be made to be about 10 ns.

Example 3: Embodiment 3 explains the first UE and the non-reference base station of scheme 3, wherein the first UE (namely, the reference UE) is a UE dedicated to positioning measurement, including UE a and UE b; the first UE fed back by the target UE c A positioning measurement value is TDOA (that is, RSTD); the positioning reference signal PRS is NR PRS; base station i is a reference base station, and base station j is a non-reference base station.

；同理可得第一UE b關於參考基地台i和非參考基地台j之間的第一時鐘偏差

，計算過程參見實施例1的公式（1）到公式（5）； Step 3：第一UE a和第一UE b分別把上述第一時鐘偏差估計值

和

上報給非參考基地台j。The clock offset determination method on the first UE (reference UE) side includes: Step 1: The first UE a and the first UE b receive configuration signaling of the first downlink PRS signal; wherein, the first downlink PRS is NR PRS, The configuration signaling can be positioning-specific signaling from the LMF, broadcast signaling from the serving base station, UE-specific RRC signaling or DCI signaling; Step 2: The first UE a receives and measures the reference base station i and the first downlink PRS signal of non-reference base station j, and obtain the first clock offset between reference base station i and non-reference base station j

; In the same way, the first UE b can obtain the first clock offset between the reference base station i and the non-reference base station j

, refer to the formula (1) to formula (5) in Embodiment 1 for the calculation process; Step 3: the first UE a and the first UE b respectively calculate the above-mentioned first clock offset estimated value

with

Report to non-reference base station j.

Correspondingly, the method for determining the clock bias on the non-reference base station side includes: Step 1: The non-reference base station receives configuration signaling of the first downlink PRS signal and the second downlink PRS signal; the configuration signaling is dedicated positioning signaling from the LMF; Step 2: At time T1, the non-reference base station sends the first downlink PRS signal to all the first UEs; Step 3: The non-reference base station receives the first clock offset fed back by multiple reference UEs, and determines the second clock offset based on predefined criteria, where the predefined criteria include but not limited to arithmetic mean, optimal channel condition selection and weighted average .

，預定義準則至少有以下三種計算方法： Option1：算術平均，例如：

； Option2：選擇通道條件最優（例如：RSRP和/或SINR最大的UE的通道條件最優）的參考UE的時鐘偏差作為第二時鐘偏差

，例如：參考UE a的RSRP和/或SINR大於參考UE b的RSRP和/或SINR，即參考UE a的RSRP大於參考UE b的RSRP，和/或，參考UE a的SINR大於參考UE b的SINR，則選擇

；反之，選擇

； Option3：加權平均，例如：

，其中，

是介於0到1之間的加權係數，可以根據UE a和UE b的通道條件來確定

取值。A more accurate second clock offset between base station i and base station j can be calculated by combining the first clock offset reported by two first UEs (including reference UE a and reference UE b) by non-reference base station j

, the predefined criterion has at least the following three calculation methods: Option1: Arithmetic mean, for example:

; Option2: Select the clock offset of the reference UE with the best channel condition (for example: the channel condition of the UE with the largest RSRP and/or SINR is the best) as the second clock offset

, for example: the RSRP and/or SINR of the reference UE a is greater than the RSRP and/or SINR of the reference UE b, that is, the RSRP of the reference UE a is greater than the RSRP of the reference UE b, and/or the SINR of the reference UE a is greater than that of the reference UE b SINR, select

; otherwise, choose

; Option3: weighted average, for example:

,in,

is a weighting coefficient between 0 and 1, which can be determined according to the channel conditions of UE a and UE b

value.

In Embodiment 3, Option3 is used.

，修正自身相對於參考基地台i的第二時鐘偏差； Step 5：在T2時刻，非參考基地台在修正了自身相對於參考基地台的第二時鐘偏差之後，向全部第二UE發送第二下行PRS信號。Step 4: The non-reference base station is based on the above-mentioned second clock deviation

, to correct its own second clock offset relative to the reference base station i; Step 5: At T2, after the non-reference base station has corrected its own second clock offset relative to the reference base station, it sends the second Downlink PRS signal.

The maximum value of the clock deviation between base stations of the TDD system is plus or minus 50ns. Through the above processing, combined with a large transmission bandwidth and a high-precision TOA estimation algorithm (for example: BW=400MHz, the TOA measurement algorithm uses the MUSIC algorithm ), which can make the residual clock skew around 1 ns.

To sum up, referring to Figure 4, on the terminal side (applicable to both the reference terminal and the target terminal), a method for determining a clock offset provided by an embodiment of the present invention includes: S101. Acquire the configuration signaling of the first downlink positioning reference signal PRS, and receive and measure the first downlink PRS from the reference base station and the non-reference base station based on the configuration signaling of the first downlink PRS; S102. Determine and send the first clock offset between the reference base station and the non-reference base station based on the first downlink PRS, so that the node receiving the first clock offset confirms the second clock based on the first clock offset deviation.

Through the method, the configuration signaling of the first downlink positioning reference signal PRS is obtained, and based on the configuration signaling of the first downlink PRS, the first downlink PRS from the reference base station and the non-reference base station is received and measured ; Determine and send the first clock offset between the reference base station and the non-reference base station based on the first downlink PRS, so that the node receiving the first clock offset confirms the second clock offset based on the first clock offset , which reduces the clock skew between the base stations, thereby improving the positioning accuracy.

Optionally, the first clock offset is sent to a location management function LMF entity or a non-reference base station.

Correspondingly, referring to FIG. 5, on the terminal side (applicable to the target terminal), a method for determining a clock offset provided by an embodiment of the present invention includes: S201. Receive the first clock offset between the reference base station and the non-reference base station; wherein, the first clock offset is the first terminal measuring the first downlink positioning reference from the reference base station and the non-reference base station signal PRS determined; S202. Determine a second clock offset based on the first clock offset.

Optionally, before determining the second clock offset based on the first clock offset, the method further includes: acquiring configuration signaling of a second downlink positioning reference signal PRS, and receiving and measuring based on the configuration signaling of the second downlink PRS A second downlink PRS from a reference base station and a non-reference base station; determining a first positioning measurement value based on the second downlink PRS; After determining the second clock offset based on the first clock offset, the method further includes: correcting the first positioning measurement value based on the second clock offset to obtain a second positioning measurement value.

Optionally, the method also includes: Positioning is performed based on the second positioning measurement value.

Optionally, based on the first clock deviation, determining the second clock deviation specifically includes: Based on the first clock offset and predefined criteria, a second clock offset is determined.

Optionally, the predefined criteria include one or a combination of the following calculation criteria: arithmetic mean, optimal value of selected channel conditions, and weighted average.

Optionally, the first clock offset is obtained by the location management function LMF entity receiving the first clock offset reported by the first UE, and forwarding the first clock offset to the second UE.

Correspondingly, referring to FIG. 6, on the network side, a method for determining a clock offset provided by an embodiment of the present invention includes: S301. Send configuration signaling of the first downlink PRS to the first terminal, and send configuration signaling of the second downlink PRS to the second terminal; S302. Receive the first clock offset between the reference base station and the non-reference base station reported by the first terminal and/or the second terminal; S303. Determine a second clock offset based on the first clock offset.

Optionally, based on the first clock deviation, determining the second clock deviation specifically includes: The first clock offset is forwarded to the second terminal, and the second terminal determines the second clock offset based on the first clock offset.

Optionally, the method also includes: Based on the second clock offset, the first positioning measurement value reported by the second terminal is corrected to obtain the second positioning measurement value.

Optionally, the method also includes: Positioning is performed based on the second positioning measurement value.

Optionally, the method further includes: based on the second clock offset, correcting the clock offset of the non-reference base station relative to the reference base station.

Optionally, before sending the configuration signaling of the first downlink PRS to the first terminal and sending the configuration signaling of the second downlink PRS to the second terminal, the method further includes: receiving the configuration signaling of the first downlink PRS signal and configuration signaling of the second downlink PRS signal; based on the configuration signaling of the first downlink PRS signal, sending the first downlink PRS signal to the first terminal; After correcting the clock deviation of the non-reference base station relative to the reference base station, the method further includes: sending the second downlink PRS signal to the second terminal based on the configuration signaling of the second downlink PRS signal.

Optionally, the receiving the configuration signaling of the first downlink PRS signal and the configuration signaling of the second downlink PRS signal specifically includes: The configuration signaling of the first downlink PRS signal and the configuration signaling of the second downlink PRS signal sent by the location management function LMF entity are received.

Optionally, based on the first clock deviation, determining the second clock deviation specifically includes: Based on the first clock offset and predefined criteria, a second clock offset is determined.

Optionally, the predefined criteria include one or a combination of the following calculation criteria: arithmetic mean, optimal value of selected channel conditions, and weighted average.

Optionally, the method also includes: Send the configuration signaling of the first downlink PRS signal to the reference base station and the non-reference base station, and send the configuration signaling of the second downlink PRS signal to the reference base station and the non-reference base station.

For example, on the location management server side, such as the LMF side, a method for determining a clock offset provided by an embodiment of the present invention includes: receiving the first clock offset between the reference base station and the non-reference base station reported by the first terminal and/or the second terminal; Based on the first clock offset, determine the second clock offset; or forward the first clock offset to the second terminal, and the second terminal determines the second clock offset based on the first clock offset.

Optionally, the method also includes: Based on the second clock offset, the first positioning measurement value reported by the second terminal is corrected to obtain the second positioning measurement value.

Optionally, the method also includes: Positioning is performed based on the second positioning measurement value.

Optionally, based on the first clock deviation, determining the second clock deviation specifically includes: Based on the first clock offset and predefined criteria, a second clock offset is determined.

Optionally, the predefined criteria include one or a combination of the following calculation criteria: arithmetic mean, optimal value of selected channel conditions, and weighted average.

Optionally, the method also includes: Sending configuration signaling of the first downlink PRS signal to the first terminal, sending configuration signaling of the second downlink PRS signal to the second terminal, and sending configuration signaling of the first downlink PRS signal to the reference base station and the non-reference base station The configuration signaling of the second downlink PRS signal is sent to the reference base station and the non-reference base station.

On the side of the base station, for example, on the side of the non-reference base station, a method for determining a clock offset provided by an embodiment of the present invention includes: receiving the first clock offset between the reference base station and the non-reference base station reported by the first terminal and/or the second terminal; determining a second clock bias based on the first clock bias; Based on the second clock offset, the clock offset of the non-reference base station relative to the reference base station is corrected.

Optionally, the method also includes: receiving configuration signaling of the first downlink PRS signal and configuration signaling of the second downlink PRS signal; Sending the first downlink PRS signal to the first terminal based on the configuration signaling of the first downlink PRS signal; After correcting the clock deviation of the non-reference base station relative to the reference base station, the second downlink PRS signal is sent to the second terminal based on the configuration signaling of the second downlink PRS signal.

Optionally, the configuration signaling is location-specific signaling from the location management function LMF entity.

Optionally, based on the first clock deviation, determining the second clock deviation specifically includes: Based on the first clock offset and predefined criteria, a second clock offset is determined.

Optionally, the predefined criteria include one or a combination of the following calculation criteria: arithmetic mean, optimal value of selected channel conditions, and weighted average.

Corresponding to the above methods, the following introduces the device provided by the embodiment of the present invention.

Referring to FIG. 7, on the terminal side (applicable to both the reference terminal and the target terminal), an apparatus for determining a clock offset provided by an embodiment of the present invention includes: The first unit 11 is configured to acquire the configuration signaling of the first downlink positioning reference signal PRS, and receive and measure the first downlink from the reference base station and the non-reference base station based on the configuration signaling of the first downlink PRS Row PRS; The second unit 12 is configured to determine and send the first clock offset between the reference base station and the non-reference base station based on the first downlink PRS, so that the node receiving the first clock offset bases the first clock offset , to confirm the second clock skew.

Optionally, the second unit 12 is specifically used for: The first clock offset is sent to the location management function LMF entity or the non-reference base station.

Correspondingly, referring to FIG. 8, on the terminal side (applicable to the target terminal), another device for determining a clock offset provided by an embodiment of the present invention includes: The third unit 21 is configured to receive a first clock offset between a reference base station and a non-reference base station; wherein, the first clock offset is measured by the first terminal from the reference base station and the non-reference base station. Determined by the downlink positioning reference signal PRS; The fourth unit 22 is configured to determine a second clock deviation based on the first clock deviation.

Optionally, the fourth unit 22 is also used for: Obtain the configuration signaling of the second downlink positioning reference signal PRS, and receive and measure the second downlink PRS from the reference base station and the non-reference base station based on the configuration signaling of the second downlink PRS; determine based on the second downlink PRS First location measurement;

The fourth unit 22 is also used for: Based on the second clock offset, the first positioning measurement value is corrected to obtain a second positioning measurement value.

Optionally, the fourth unit 22 is also used for: Positioning is performed based on the second positioning measurement value.

Optionally, the fourth unit 22 is specifically used for: Based on the first clock offset and predefined criteria, a second clock offset is determined.

Optionally, the predefined criteria include one or a combination of the following calculation criteria: arithmetic mean, optimal value of selected channel conditions, and weighted average.

Optionally, the third unit 21 is specifically used for: By receiving the first clock offset reported by the first terminal, and forwarding the first clock offset to the second terminal.

Correspondingly, referring to FIG. 9, on the network side, such as the LMF side or the base station side, an apparatus for determining a clock offset provided by an embodiment of the present invention includes: A sending unit 31, configured to send configuration signaling of the first downlink PRS to the first terminal, and send configuration signaling of the second downlink PRS to the second terminal; The receiving unit 32 is configured to receive the first clock offset between the reference base station and the non-reference base station reported by the first terminal and/or the second terminal; The determining unit 33 is configured to determine a second clock offset based on the first clock offset.

Optionally, the determining unit 33 is specifically configured to: The first clock offset is forwarded to the second terminal, and the second terminal determines the second clock offset based on the first clock offset.

Optionally, the determining unit 33 is specifically configured to: Based on the second clock offset, the first positioning measurement value reported by the second terminal is corrected to obtain the second positioning measurement value.

Optionally, the determining unit 33 is also used for: Positioning is performed based on the second positioning measurement value.

Optionally, the determining unit 33 is also used for: Based on the second clock offset, the clock offset of the non-reference base station relative to the reference base station is corrected.

Optionally, the sending unit 31 is also used for: receiving configuration signaling of the first downlink PRS signal and configuration signaling of the second downlink PRS signal; sending the first downlink PRS signal to the first terminal based on the configuration signaling of the first downlink PRS signal; After correcting the clock deviation of the non-reference base station relative to the reference base station, the sending unit 31 is also used for: Based on the configuration signaling of the second downlink PRS signal, send the second downlink PRS signal to the second terminal.

Optionally, the sending unit 31 is also used for: The configuration signaling of the first downlink PRS signal and the configuration signaling of the second downlink PRS signal sent by the location management function LMF entity are received.

Optionally, the determining unit 903 is specifically configured to: Based on the first clock offset and predefined criteria, a second clock offset is determined.

Optionally, the predefined criteria include one or a combination of the following calculation criteria: arithmetic mean, optimal value of selected channel conditions, and weighted average.

Optionally, the sending unit 31 is also used for: Send the configuration signaling of the first downlink PRS to the reference base station and the non-reference base station, and send the configuration signaling of the second downlink PRS to the reference base station and the non-reference base station.

Referring to FIG. 10 , a terminal provided by an embodiment of the present invention (applicable to both the reference terminal and the target terminal) includes a transceiver 610, a processor 600 and a memory 620: Transceiver 610, for receiving and sending data under the control of processor 600; The processor 600 is used to read the program in the memory 620 and execute the following processes: Acquiring the configuration signaling of the first downlink positioning reference signal PRS, and receiving and measuring the first downlink PRS from the reference base station and the non-reference base station based on the configuration signaling of the first downlink PRS; Determine and send a first clock offset between the reference base station and the non-reference base station based on the first downlink PRS, so that a node receiving the first clock offset confirms a second clock offset based on the first clock offset.

Optionally, the processor 600 is specifically used for: The transceiver 610 reports the first clock offset to the LMF entity or the non-reference base station.

In addition, when the terminal provided by the embodiment of the present invention is used as a target terminal, it includes a transceiver 610, a processor 600 and a memory 620: Transceiver 610, used to receive and send data under the control of the processor; The processor 600 is also used to read the program in the memory 620 and execute the following processes: The first clock offset between the reference base station and the non-reference base station is received by the transceiver 610; wherein, the first clock offset is obtained by the first terminal by measuring the first clock offset from the reference base station and the non-reference base station Determined by the row positioning reference signal PRS; Based on the first clock offset, a second clock offset is determined.

Optionally, the processor 600 is also used for: Based on the first clock deviation, before determining the second clock deviation, obtain the configuration signaling of the second downlink positioning reference signal PRS, and receive and measure the configuration signaling from the reference base station and the non-reference base station based on the configuration signaling of the second downlink PRS A second downlink PRS of the station; determining a first positioning measurement value based on the second downlink PRS; After the second clock offset is determined based on the first clock offset, the first positioning measurement value is corrected based on the second clock offset to obtain a second positioning measurement value.

Optionally, the processor 600 is also used for: Positioning is performed based on the second positioning measurement value.

Optionally, the processor 600 is specifically used for: Based on the first clock offset and predefined criteria, a second clock offset is determined.

Optionally, the predefined criteria include one or a combination of the following calculation criteria: arithmetic mean, optimal value of selected channel conditions, and weighted average.

Optionally, the first clock offset is obtained by the location management function LMF entity receiving the first clock offset reported by the first UE, and forwarding the first clock offset to the second UE.

Wherein, in FIG. 10 , the bus architecture may include any number of interconnected buses and bridges, specifically, one or more processors represented by the processor 600 and various circuits of the memory represented by the memory 620 are connected together. The busbar architecture can also connect together various other circuits such as peripherals, voltage regulators and power management circuits, etc., which are well known in the art and thus will not be further described herein. The bus interface provides the interface. Transceiver 610 may be a plurality of elements, including a transmitter and a receiver, providing a means for communicating with various other devices over transmission media. For different user devices, the user interface 630 may also be an interface capable of connecting externally and internally to required devices, and the connected devices include but not limited to keypads, monitors, speakers, microphones, joysticks, and the like.

The processor 600 is responsible for managing the bus architecture and general processing, and the memory 620 can store data used by the processor 600 when performing operations.

Optionally, the processor 600 may be a central processing unit (Center Processing Unit, CPU), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field-programmable gate array (Field-Programmable Gate Array, FPGA) or a complex Programmable Logic Device (Complex Programmable Logic Device, CPLD).

Referring to FIG. 11 , an apparatus for determining a clock deviation provided by an embodiment of the present invention includes a transceiver 501, a processor 504, and a memory 505: Transceiver 501, for receiving and sending data under the control of processor 504; The processor 504 is used to read the program in the memory 505 and execute the following processes: sending configuration signaling of the first downlink PRS to the first terminal through the transceiver 501, and sending configuration signaling of the second downlink PRS to the second terminal; receiving the first clock offset between the reference base station and the non-reference base station reported by the first terminal and/or the second terminal through the transceiver 501; Based on the first clock offset, a second clock offset is determined.

Optionally, the processor 504 is specifically configured to: The first clock offset is forwarded to the second terminal, and the second terminal determines the second clock offset based on the first clock offset.

Optionally, the processor 504 is also used for: Based on the second clock offset, the first positioning measurement value reported by the second terminal is corrected to obtain the second positioning measurement value.

Optionally, the processor 504 is also used for: Positioning is performed based on the second positioning measurement value.

Optionally, the processor 504 is also used for: Based on the second clock offset, the clock offset of the non-reference base station relative to the reference base station is corrected.

Optionally, the processor 504 is also used for: Receive configuration signaling of the first downlink PRS signal and configuration signaling of the second downlink PRS signal through the transceiver 501; send the first downlink PRS to the first terminal based on the configuration signaling of the first downlink PRS signal Signal; Based on the configuration signaling of the second downlink PRS signal, the transceiver 501 sends the second downlink PRS signal to the second terminal.

Optionally, the transceiver 501 is specifically used for: The configuration signaling of the first downlink PRS signal and the configuration signaling of the second downlink PRS signal sent by the location management function LMF entity are received.

Optionally, the processor 504 is specifically configured to: Based on the first clock offset and predefined criteria, a second clock offset is determined.

Optionally, the predefined criteria include one or a combination of the following calculation criteria: arithmetic mean, optimal value of selected channel conditions, and weighted average.

Optionally, the processor 504 is also used for: Send the configuration signaling of the first downlink PRS signal to the reference base station and the non-reference base station, and send the configuration signaling of the second downlink PRS signal to the reference base station and the non-reference base station.

In FIG. 11, a bus architecture (represented by bus 506), which may include any number of interconnected buses and bridges, will include one or more processors and Various circuits of the memory represented by the memory 505 are connected together. The bus bar 500 can also connect together various other circuits, such as peripheral devices, voltage regulators and power management circuits, etc., which are well known in the art and thus will not be further described herein. The bus interface 503 provides an interface between the bus 506 and the transceiver 501 . Transceiver 501 may be a single element, or multiple elements, such as multiple receivers and transmitters, providing a means for communicating with various other devices over a transmission medium. The data processed by the processor 504 is transmitted on the wireless medium through the antenna 502 , further, the antenna 502 also receives the data and transmits the data to the processor 504 .

The processor 504 is responsible for managing the bus 506 and general processing, and may also provide various functions including timing, peripheral interface, voltage regulation, power management, and other control functions. The memory 505 can be used to store data used by the processor 504 when performing operations.

Optionally, the processor 504 may be a central processing unit CPU, an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field programmable gate array (Field-Programmable Gate Array, FPGA) or a complex programmable logic device ( Complex Programmable Logic Device, CPLD).

It should be noted that the division of the units in the embodiment of the present invention is schematic, and is only a logical function division, and there may be another division manner in actual implementation. In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, each unit may exist as a separate entity, or two or more units may be integrated into one unit. The above-mentioned integrated units can be implemented not only in the form of hardware, but also in the form of software functional units.

If the integrated unit is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of software products, and the computer software products are stored in a storage medium Among them, several instructions are included to make a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage media include: USB disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk, etc., which can store program codes. medium.

An embodiment of the present invention provides a computing device, and the computing device may specifically be a desktop computer, a portable computer, a smart phone, a tablet computer, a personal digital assistant (Personal Digital Assistant, PDA), and the like. The computing device may include a central processing unit CPU, a memory, an input/output device, etc., an input device may include a keyboard, a mouse, a touch screen, etc., and an output device may include a display device, such as a liquid crystal display (Liquid Crystal Display, LCD), cathode ray tube (Cathode Ray Tube, CRT), etc.

Memory can include read-only memory (ROM) and random-access memory (RAM), and provides the processor with program instructions and data stored in memory. In the embodiments of the present invention, the memory may be used to store programs of any of the methods provided in the embodiments of the present invention.

The processor invokes the program instructions stored in the memory, and the processor is used to execute any one of the methods provided in the embodiments of the present invention according to the obtained program instructions.

An embodiment of the present invention provides a computer storage medium for storing computer program instructions used by the device provided by the above-mentioned embodiments of the present invention, which includes a program for executing any method provided by the above-mentioned embodiments of the present invention.

The computer storage medium may be any available medium or data storage device that can be accessed by a computer, including but not limited to magnetic memory (such as floppy disk, hard disk, magnetic tape, magneto-optical disk (MO), etc.), optical memory (such as CD, DVD, BD, HVD, etc.), and semiconductor memory (such as ROM, EPROM, EEPROM, flash memory (NAND FLASH), solid state drive (SSD)), etc.

The method provided by the embodiment of the present invention can be applied to terminal equipment, and can also be applied to network equipment.

Wherein, the terminal device may also be referred to as user equipment UE, mobile station (Mobile Station, "MS" for short), mobile terminal (Mobile Terminal), etc. Optionally, the terminal may be equipped with a wireless access network ( Radio Access Network, RAN) and the ability to communicate with one or more core networks, for example, the terminal can be a mobile phone (or called "cellular" phone), or a computer with a mobile nature, etc., for example, the terminal can also be a Portable, Pocket, Handheld, Built-in Computer or Car Mobile Devices.

A network device may be a base station (for example, an access point), which refers to a device in an access network that communicates with a wireless terminal through one or more magnetic zones on an air interface. The base station can be used to convert received air frames to and from IP packets and act as a router between the wireless terminal and the rest of the access network, which can include an Internet Protocol (IP) network. The base station may also coordinate attribute management for the air interface. For example, the base station may be a base station (Base Transceiver Station, BTS) in GSM or CDMA, or a base station (NodeB) in WCDMA, or an evolved base station (NodeB or eNB or e- NodeB, evolutional Node B), or gNB in the 5G system, etc. There is no limitation in the embodiment of the present invention.

The processing flow of the above method can be realized by a software program, the software program can be stored in a storage medium, and when the stored software program is invoked, the steps of the above method are executed.

In summary, the technical solutions proposed in the embodiments of the present invention include: First, the first UE (that is, the reference UE) and/or the second UE (that is, the target UE) measures the downlink positioning reference signal PRS from the reference base station and the non-reference base station to obtain the first positioning measurement value (that is, the TDOA measurement value ), and further calculate to obtain the first clock offset between the reference base station and the non-reference base station.

Then, the first UE and/or the second UE report the first clock offset to different objects in three ways and perform subsequent processing: Method 1), the first UE and/or the second UE report the first clock offset feedback to the LMF, and the LMF determines the second clock offset, and then the LMF performs the first positioning measurement fed back by the second UE based on the second clock offset Correct the value TDOA (that is, RSTD) and obtain the second positioning measurement value, and then perform positioning calculation based on the second positioning measurement value (for example: downlink positioning calculation based on OTDOA or uplink positioning calculation based on UTDOA); Mode 2), the first UE reports the first clock offset feedback to the LMF, and then the LMF forwards the second UE, and then the second UE determines the second clock offset based on the first clock offset, and the target UE uses the first positioning measurement value TDOA (that is, RSTD) is corrected and the second positioning measurement value is obtained, and then the downlink positioning based on OTDOA is performed based on the second positioning measurement value obtained after correction; Mode 3), the first UE and/or the second UE feeds back the first clock offset to the non-reference base station, and the non-reference base station determines the second clock offset, and then the non-reference base station corrects itself based on the second clock offset relative to Referring to the second clock deviation of the base station, the reference base station and the non-reference base station respectively send downlink PRS signals to the second UE; the second UE further receives and measures the downlink PRS signals, and then performs downlink positioning calculation based on downlink OTDOA.

Wherein, the first UE may be a UE dedicated to positioning measurement, or a regular UE; the positioning reference signal PRS may be any downlink signal, including but not limited to: NR PRS, NR C-PRS, SSB, and CSI-RS; The LMF may determine the second clock offset based on a predefined criterion based on the first clock offset fed back by multiple reference UEs, where the predefined criterion includes but is not limited to an arithmetic mean, an optimal value of selected channel conditions, and a weighted average.

The first UE (reference UE) in the three schemes provided by the embodiment of the present invention, the LMF in scheme 1, the second UE (target UE) in scheme 2, and the non-reference base station in scheme 3 respectively perform the following steps: The first UE (reference UE) performs the following steps: Step 1: The first UE receives the configuration signaling of the first downlink PRS signal; wherein, the first downlink PRS can be any downlink signal, including but not limited to NR PRS, NR C-PRS, SSB and CSI-RS, the The configuration signaling can be positioning-specific signaling from the LMF, broadcast signaling from the serving base station, UE-specific RRC signaling or DCI signaling; Step 2: The first UE receives and measures the first downlink PRS signal of the reference base station and the non-reference base station, and obtains the first clock offset between the reference base station and the non-reference base station; Step 3: The first UE reports the first clock offset to the LMF or the non-reference base station.

The LMF in Scheme 1 performs the following steps: Step 1: The LMF sends the configuration signaling of the first downlink PRS signal to the first UE, sends the configuration signaling of the second downlink PRS signal to the second UE, and sends the first downlink PRS to the reference base station and the non-reference base station Signal configuration signaling, sending configuration signaling of the second downlink PRS signal to the reference base station and the non-reference base station; wherein, the above configuration signaling can be sent simultaneously or sequentially; Step 2: The LMF receives the first clock offset reported by the first UE, and determines the second clock offset based on predefined criteria, where the predefined criteria include but not limited to arithmetic mean, optimal value of selected channel conditions, and weighted average; Step 3: Based on the second clock deviation, the LMF corrects the first positioning measurement value TDOA (that is, RSTD) fed back by the target UE and obtains the second positioning measurement value; Step 4: The LMF performs OTDOA-based positioning calculation based on the corrected second positioning measurement value.

The second UE (target UE) in solution 2 performs the following steps: Step 1: The second UE receives the configuration signaling of the second downlink PRS signal; wherein, the second downlink PRS may be any downlink signal, including but not limited to NR PRS, NR C-PRS, SSB and CSI-RS, and the configuration signaling The signaling can be positioning-specific signaling from the LMF, broadcast signaling from the serving base station, UE-specific RRC signaling or DCI signaling; Step 2: The second UE receives and measures the second downlink PRS signal of the reference base station and the non-reference base station, and obtains the first positioning measurement value TDOA (ie RSTD); Step 3: The second UE receives the first clock offset about the reference base station and the non-reference base station forwarded by the LMF, and determines the second clock offset based on a predefined criterion, where the predefined criterion includes but not limited to arithmetic mean, channel selection Conditional optimum and weighted average; Step 4: Based on the second clock deviation, the second UE corrects the first positioning measurement value TDOA (that is, RSTD) measured in Step 2 and obtains the second positioning measurement value; Step 5: The second UE performs OTDOA-based positioning calculation based on the corrected second positioning measurement value.

The non-reference base station in scheme 3 performs the following steps: Step 1: The non-reference base station receives configuration signaling of the first downlink PRS signal and the second downlink PRS signal; the configuration signaling is dedicated positioning signaling from the LMF; Step 2: At time T1, the non-reference base station sends the first downlink PRS signal to all the first UEs; Step 3: The non-reference base station receives the first clock offset fed back by multiple reference UEs, and determines the second clock offset based on predefined criteria, where the predefined criteria include but not limited to arithmetic mean, optimal channel condition selection and weighting average; Step 4: The non-reference base station corrects its own second clock deviation relative to the reference base station based on the second clock deviation; Step 5: At time T2, the non-reference base station sends a second downlink PRS signal to all second UEs after correcting its own second clock offset relative to the reference base station.

Therefore, an embodiment of the present invention proposes a scheme for calibrating clock offsets between base stations based on TDOA measurement values. It solves the problem that the positioning algorithm accuracy of the existing single-difference scheme is limited by the clock deviation measurement accuracy of the PRS signal, thereby degrading the positioning performance of the system. The maximum value of the clock deviation between the base stations of the existing TDD system is plus or minus 50 ns. After processing through the technical solution provided by the embodiment of the present invention, the residual clock deviation can be about 10 ns, or even about 1 ns.

Those skilled in the art should understand that the embodiments of the present invention may be provided as methods, systems, or computer program products. Accordingly, the present invention can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk memory and optical memory, etc.) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each process and/or block in the flowchart and/or block diagram, and a combination of processes and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing equipment to produce a machine so that the instructions executed by the processor of the computer or other programmable data processing equipment Produce means for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, such that the instructions stored in the computer-readable memory generate product, the instruction device implements the functions specified in one or more procedures of the flow chart and/or one or more blocks of the block diagram.

These computer program instructions may also be loaded into a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce computer-implemented The instructions executed above provide steps for implementing the functions specified in the procedure or procedures of the flowchart and/or the block or blocks of the block diagram.

The above are only preferred embodiments of the present invention, and are not used to limit the implementation scope of the present invention. If the present invention is modified or equivalently replaced without departing from the spirit and scope of the present invention, it shall be covered by the protection of the patent scope of the present invention. in the range.

11: Unit 1 12: The second unit 21: Unit 3 22: Unit 4 31: Sending unit 32: Receiving unit 33: Determine the unit 501: Transceiver 502: Antenna 503: bus interface 504: Processor 505: memory 506: busbar 600: Processor 610: Transceiver 620: memory 630: user interface S101-S102: Steps S201-S202: Steps S301-S303: Steps

FIG. 1 is a schematic diagram of a clock offset calibration scheme for LMF processing provided by an embodiment of the present invention; FIG. 2 is a schematic diagram of a clock offset calibration scheme of an LMF notifying a target UE provided by an embodiment of the present invention; FIG. 3 is a schematic diagram of a scheme for correcting clock bias of a non-reference base station provided by an embodiment of the present invention; FIG. 4 is a schematic flowchart of a method for determining a clock offset applicable to the reference terminal and the target terminal side provided by an embodiment of the present invention; FIG. 5 is a schematic flowchart of a method for determining a clock offset on the target terminal side provided by an embodiment of the present invention; FIG. 6 is a schematic flowchart of a method for determining a clock offset applicable to the network side provided by an embodiment of the present invention; FIG. 7 is a schematic structural diagram of an apparatus for determining a clock offset applicable to the reference terminal and the target terminal according to an embodiment of the present invention; FIG. 8 is a schematic structural diagram of an apparatus for determining a clock offset on the target terminal side according to an embodiment of the present invention; FIG. 9 is a schematic structural diagram of a device for determining a clock offset applicable to the network side provided by an embodiment of the present invention; FIG. 10 is a schematic structural diagram of a terminal provided by an embodiment of the present invention; Fig. 11 is a schematic structural diagram of a network side device provided by an embodiment of the present invention.

S101-S102: Steps

Claims (8)

A method for determining a clock offset, the method comprising: receiving a first clock offset between a reference base station and a non-reference base station; wherein, the first clock offset is obtained by a first terminal from the reference base station and the non-reference base station by measuring The first downlink positioning reference signal PRS of the station is determined; the first downlink positioning reference signal PRS is determined based on configuration signaling; the configuration signaling of the second downlink positioning reference signal PRS is obtained, and based on the configuration of the second downlink PRS Signaling receives and measures a second downlink PRS from the reference base station and the non-reference base station; determines a first positioning measurement value based on the second downlink PRS; determines a second clock offset based on the first clock offset and a predefined criterion; Wherein, the predefined criteria include one or a combination of the following calculation criteria: arithmetic mean, optimal value of selected channel conditions, and weighted average; based on the second clock deviation, the first positioning measurement value is corrected to obtain the second positioning measurement value; locate based on this second positioning measurement. The clock offset determination method described in item 1 of the patent scope of the application, the first clock offset is received by the location management function LMF entity through receiving the first clock offset reported by the first terminal, and forwarding the first clock offset to of the second terminal. A method for determining a clock offset, the method comprising: receiving configuration signaling of a first downlink PRS signal and configuration signaling of a second downlink PRS signal; based on the configuration signaling of the first downlink PRS signal, sending The first downlink PRS signal; sending configuration signaling of the first downlink PRS to the first terminal, and sending the first downlink PRS configuration signaling to the second terminal Sending configuration signaling of the second downlink PRS; receiving a first clock offset between a reference base station and a non-reference base station reported by the first terminal and/or the second terminal; based on the first clock offset and the predicted Define a criterion to determine the second clock deviation; the predefined criterion includes one or a combination of the following calculation criteria: arithmetic mean, optimal value of selected channel conditions, weighted average; based on the second clock deviation, for the second terminal reported Correcting the first positioning measurement value to obtain a second positioning measurement value; performing positioning based on the second positioning measurement value; and, based on the second clock deviation, correcting the clock deviation of the non-reference base station relative to the reference base station; based on The configuration signaling of the second downlink PRS signal is to send the second downlink PRS signal to the second terminal. According to the clock deviation determination method described in item 3 of the scope of the patent application, determining the second clock deviation based on the first clock deviation includes: forwarding the first clock deviation to the second terminal, and the second terminal based on the The first clock offset determines the second clock offset. For the method for determining the clock offset described in item 3 of the scope of the patent application, the receiving the configuration signaling of the first downlink PRS signal and the configuration signaling of the second downlink PRS signal includes: receiving the location management function LMF entity sending the Configuration signaling of the first downlink PRS signal and configuration signaling of the second downlink PRS signal. As the method for determining the clock bias described in item 3 of the scope of patent application, the method also includes It includes: sending configuration signaling of the first downlink PRS to the reference base station and the non-reference base station, and sending configuration signaling of the second downlink PRS to the reference base station and the non-reference base station. A communication device, including: a processor, a memory, and a transceiver; the processor is used to read the program in the memory, and execute the clock deviation determination described in any one of items 1 to 6 of the scope of the patent application method. A computer-readable storage medium, the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to make the computer execute the clock deviation determination described in any one of items 1 to 6 of the scope of the patent application method.

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