Downlink Departure Angle Determination Method, Network Side, Positioning Terminal, Device, and Storage Medium

Abstract

The present application provides a method for determining a downlink departure angle, a network side, a positioning end, a device, and a storage medium. The method includes: determining the beamforming parameters and antenna parameters used by a TRP to transmit each DL-PRS, and the difference parameters of the TRP, where the difference parameters include the parameters indicating the differences in amplitude and phase of the transmission paths of the respective antenna elements of the corresponding TRP; sending the beamforming parameters, antenna parameters, and difference parameters to the positioning end for the positioning end to determine the downlink departure angle based on the beamforming parameters, antenna parameters, and difference parameters. The method, network side, positioning end, device, and storage medium provided by the present application, by transmitting the beamforming parameters, antenna parameters, and difference parameters of each DL-PRS, greatly reduce the data transmission volume from the network side to the positioning end on the premise of ensuring that the positioning end obtains an accurate DL-PRS beam distribution, effectively improve the positioning accuracy of the downlink departure angle, and save transmission resources.

Description

Technical Field

[0001] This application relates to the field of communication technologies, and in particular, to a method for determining a downlink angle of departure, a network side, a positioning end, a device, and a storage medium. Background Art

[0002] Currently, for the DL-AoD (Downlink Angle of Departure) positioning method of NR (New Radio), the UE (User Equipment) receives DL-PRS (Downlink-Positioning Reference Signal) according to the configuration information of the DL-PRS sent by the surrounding TRPs (Transmit and Receive Points) provided by the network side, measures each DL-PRS beam of each TRP, and reports the RSRP (Reference Signal Receiving Power) measurement value to the LMF (Location Management Function). The LMF uses the DL-PRS RSRP reported by the UE and other known information (such as the transmission directions of each DL-PRS beam of each TRP) to determine the angle of the UE relative to each TRP, that is, the DL-AoD.

[0003] In this process, due to the lack of beam distribution information of the DL-PRS in the LMF, the positioning accuracy of the DL-AoD is not high. Considering that the spatial distribution of each DL-PRS beam is different and must be described separately, if the beam distribution information of each DL-PRS is directly sent to the LMF by the network side, the amount of data to be transmitted will be extremely large.

[0004] Content of the Application

[0005] This application provides a method for determining a downlink angle of departure, a network side, a positioning end, a device, and a storage medium, so as to solve the problem of the positioning accuracy of the downlink angle of departure.

[0006] In a first aspect, an embodiment of this application provides a method for determining a downlink angle of departure. The method is applied to the network side and includes:

[0007] Determine the beamforming parameters and antenna parameters used by each transmit and receive point TRP to send each downlink positioning reference signal DL-PRS, and the difference parameter of the TRP. The difference parameter includes the parameter in which the amplitude and phase of the emission paths of the respective antenna elements corresponding to the TRP are different;

[0008] Send the beamforming parameter, the antenna parameter, and the difference parameter to a positioning end, so that the positioning end determines a downlink departure angle based on the beamforming parameter, the antenna parameter, and the difference parameter.

[0009] Optionally, for the downlink departure angle determination method according to an embodiment of the present application, when the network side is a serving base station and the positioning end is a terminal, the sending the beamforming parameter, the antenna parameter, and the difference parameter to the positioning end includes:

[0010] Based on at least one of radio resource control (RRC) signaling, media access control control element (MAC-CE) signaling, and downlink control information (DCI) signaling, send the beamforming parameter, the antenna parameter, and the difference parameter to the terminal;

[0011] Or, send the beamforming parameter, the antenna parameter, and the difference parameter to a location management function (LMF) unit, and the LMF unit sends the beamforming parameter, the antenna parameter, and the difference parameter to the terminal based on LTE positioning protocol (LPP) signaling.

[0012] Optionally, for the downlink departure angle determination method according to an embodiment of the present application, when the network side is a non-serving base station and the positioning end is a terminal, the sending the beamforming parameter, the antenna parameter, and the difference parameter to the positioning end includes:

[0013] Send the beamforming parameter, the antenna parameter, and the difference parameter to the serving base station, and the serving base station forwards the beamforming parameter, the antenna parameter, and the difference parameter to the terminal based on at least one of radio resource control (RRC) signaling, media access control control element (MAC-CE) signaling, and downlink control information (DCI) signaling;

[0014] Or, send the beamforming parameter, the antenna parameter, and the difference parameter to a location management function (LMF) unit, and the LMF unit forwards the beamforming parameter, the antenna parameter, and the difference parameter to the terminal based on LTE positioning protocol (LPP) signaling.

[0015] Optionally, for the downlink departure angle determination method according to an embodiment of the present application, when the positioning end is a location management function (LMF) unit, the sending the beamforming parameter, the antenna parameter, and the difference parameter to the positioning end includes:

[0016] Based on the new radio positioning protocol A, send the beamforming parameter, the antenna parameter, and the difference parameter to the LMF unit.

[0017] Optionally, for the downlink departure angle determination method according to an embodiment of the present application, the difference parameter includes at least one of gain-delay information of each radio frequency (RF) channel in the corresponding TRP, delay information from each RF channel to each antenna element, and gain information of each antenna element.

[0018] In a second aspect, an embodiment of the present application provides a downlink departure angle determination method, which is applied to a positioning end, and the method includes:

[0019] Receiving the beamforming parameters and antenna parameters used by a transceiver point (TRP) to send each downlink positioning reference signal (DL-PRS), and the difference parameter of the TRP, where the difference parameter includes parameters indicating differences in amplitude and phase of the transmission paths of each antenna element of the corresponding TRP;

[0020] Determining the downlink departure angle based on the beamforming parameters, the antenna parameters, and the difference parameter.

[0021] Optionally, for the downlink departure angle determination method according to an embodiment of the present application, the determining the downlink departure angle based on the beamforming parameters, the antenna parameters, and the difference parameter includes:

[0022] Determining first beam space distribution information of the DL-PRS based on the beamforming parameters and the antenna parameters;

[0023] Correcting the first beam space distribution information based on the difference parameter to obtain second beam space distribution information;

[0024] Determining the downlink departure angle based on the second beam space distribution information.

[0025] Optionally, for the downlink departure angle determination method according to an embodiment of the present application, the determining the first beam space distribution information of the DL-PRS based on the beamforming parameters and the antenna parameters includes:

[0026] Determining a beamforming matrix based on the beamforming parameters;

[0027] Determining an antenna array steering matrix based on the antenna parameters;

[0028] Determining the first beam space distribution information based on the beamforming matrix and the antenna array steering matrix.

[0029] Optionally, for the downlink departure angle determination method according to an embodiment of the present application, the correcting the first beam space distribution information based on the difference parameter to obtain second beam space distribution information includes:

[0030] Constructing a correction matrix based on the difference parameter;

[0031] Based on the correction matrix, correct the first beam spatial distribution information to obtain the second beam spatial distribution information.

[0032] Optionally, according to the downlink departure angle determination method of an embodiment of the present application, the determining the downlink departure angle based on the second beam spatial distribution information includes:

[0033] Based on the reference signal received power (RSRP) distribution information of the DL-PRS, correct the second beam spatial distribution information to obtain the third beam spatial distribution information;

[0034] Based on the third beam spatial distribution information, determine the downlink departure angle.

[0035] Optionally, according to the downlink departure angle determination method of an embodiment of the present application, the correcting the second beam spatial distribution information based on the reference signal received power (RSRP) distribution information of the DL-PRS to obtain the third beam spatial distribution information includes:

[0036] Based on the RSRP distribution information and the second beam spatial distribution information, determine the beam residual angle deviation of the second beam spatial distribution information;

[0037] Based on the beam residual angle deviation, correct the second beam spatial distribution information to obtain the third beam spatial distribution information.

[0038] Optionally, according to the downlink departure angle determination method of an embodiment of the present application, when the positioning end is a positioning management function unit (LMF), before the correcting the second beam spatial distribution information based on the reference signal received power (RSRP) distribution information of the DL-PRS to obtain the third beam spatial distribution information, it further includes:

[0039] Receive the reference signal received power (RSRP) and the receiving location of the DL-PRS sent by the reference terminal;

[0040] Based on the RSRP and the receiving location of the DL-PRS, and the antenna location of the corresponding TRP of the DL-PRS, determine the RSRP distribution information.

[0041] Optionally, according to the downlink departure angle determination method of an embodiment of the present application, when the positioning end is a terminal, before the correcting the second beam spatial distribution information based on the reference signal received power (RSRP) distribution information of the DL-PRS to obtain the third beam spatial distribution information, it further includes:

[0042] The receiving reference terminal receives the reference signal receiving power (RSRP) and receiving location of the DL-PRS forwarded by the positioning management function unit (LMF) or the network side;

[0043] Based on the RSRP and receiving location of the DL-PRS, and the antenna location of the corresponding transmit-receive point (TRP) of the DL-PRS, determine the RSRP distribution information.

[0044] Optionally, according to the downlink departure angle determination method of an embodiment of the present application, when the positioning end is the positioning management function unit (LMF), the beamforming parameters, antenna parameters, and the differential parameters of the TRP used by the receiving transmit-receive point (TRP) to send each downlink positioning reference signal (DL-PRS) include:

[0045] Based on the new radio positioning protocol A, receive the beamforming parameters, antenna parameters, and differential parameters sent by the network side.

[0046] Optionally, according to the downlink departure angle determination method of an embodiment of the present application, when the positioning end is a terminal, the beamforming parameters, antenna parameters, and the differential parameters of the TRP used by the receiving transmit-receive point (TRP) to send each downlink positioning reference signal (DL-PRS) include:

[0047] Receive the beamforming parameters, antenna parameters, and differential parameters sent by the serving base station based on at least one of radio resource control (RRC) signaling, media access control control element (MAC-CE) signaling, and downlink control information (DCI) signaling. The beamforming parameters, antenna parameters, and differential parameters are determined by the serving base station or a non-serving base station and then sent to the serving base station;

[0048] Or, receive the beamforming parameters, antenna parameters, and differential parameters forwarded by the positioning management function unit (LMF) based on LTE positioning protocol (LPP) signaling. The beamforming parameters, antenna parameters, and differential parameters are sent by the base station to the LMF.

[0049] Optionally, according to the downlink departure angle determination method of an embodiment of the present application, the differential parameters include at least one of the gain-delay information of each radio frequency (RF) channel in the corresponding TRP, the delay information from each RF channel to each antenna element, and the gain information of each antenna element.

[0050] In a third aspect, an embodiment of the present application further provides a network side, including a memory, a transceiver, and a processor:

[0051] A memory for storing computer programs; a transceiver for transmitting and receiving data under the control of the processor; a processor for reading the computer programs in the memory and performing the following operations:

[0052] Determine the beamforming parameters and antenna parameters used by the transmission and reception point (TRP) to transmit each downlink positioning reference signal (DL-PRS), and the difference parameters of the TRP, where the difference parameters include the parameters indicating differences in amplitude and phase of the transmission paths of the respective antenna elements corresponding to the TRP;

[0053] Send the beamforming parameters, the antenna parameters, and the difference parameters to a positioning terminal for the positioning terminal to determine the downlink departure angle based on the beamforming parameters, the antenna parameters, and the difference parameters.

[0054] In a fourth aspect, an embodiment of the present application further provides a positioning terminal, including a memory, a transceiver, and a processor:

[0055] A memory for storing computer programs; a transceiver for transmitting and receiving data under the control of the processor; a processor for reading the computer programs in the memory and performing the following operations:

[0056] Receive the beamforming parameters and antenna parameters used by the transmission and reception point (TRP) to transmit each downlink positioning reference signal (DL-PRS), and the difference parameters of the TRP, where the difference parameters include the parameters indicating differences in amplitude and phase of the transmission paths of the respective antenna elements corresponding to the TRP;

[0057] Determine the downlink departure angle based on the beamforming parameters, the antenna parameters, and the difference parameters.

[0058] In a fifth aspect, an embodiment of the present application further provides a downlink departure angle determination device, including:

[0059] A data determination unit for determining the beamforming parameters and antenna parameters used by the transmission and reception point (TRP) to transmit each downlink positioning reference signal (DL-PRS), and the difference parameters of the TRP, where the difference parameters include the parameters indicating differences in amplitude and phase of the transmission paths of the respective antenna elements corresponding to the TRP;

[0060] A data sending unit for sending the beamforming parameters, the antenna parameters, and the difference parameters to a positioning terminal for the positioning terminal to determine the downlink departure angle based on the beamforming parameters, the antenna parameters, and the difference parameters.

[0061] In a sixth aspect, an embodiment of the present application further provides a downlink departure angle determination device, including:

[0062] A data receiving unit, configured to receive beamforming parameters and antenna parameters used by each transceiver point (TRP) to transmit each downlink positioning reference signal (DL-PRS), and difference parameters of the TRP, where the difference parameters include parameters indicating differences in amplitude and phase of the transmission paths of the antenna elements corresponding to the TRP;

[0063] An angle of departure determination unit, configured to determine a downlink angle of departure based on the beamforming parameters, the antenna parameters, and the difference parameters.

[0064] In a seventh aspect, an embodiment of the present application further provides a processor-readable storage medium storing a computer program, where the computer program is used to cause the processor to execute the method described in the first aspect or the second aspect above.

[0065] The downlink angle of departure determination method, network side, positioning end, device, and storage medium provided by the embodiments of the present application transmit the beamforming parameters, antenna parameters, and difference parameters of each DL-PRS. On the premise of ensuring that the positioning end can obtain an accurate DL-PRS beam distribution, the data transmission amount from the network side to the positioning end is greatly reduced, effectively improving the downlink angle of departure positioning accuracy while saving transmission resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] To more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0067] Figure 1 is one of the flowcharts of the downlink angle of departure determination method provided by the present application;

[0068] Figure 2 is another flowchart of the downlink angle of departure determination method provided by the present application;

[0069] Figure 3 is the structural diagram of the network side provided by the present application;

[0070] Figure 4 is the structural diagram of the positioning end provided by the present application;

[0071] Figure 5 is one of the structural diagrams of the downlink angle of departure determination device provided by the present application;

[0072] Figure 6 is another structural diagram of the downlink angle of departure determination device provided by the present application. Detailed implementation manners

[0073] In the embodiments of the present application, the term "and / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0074] In the embodiments of the present application, the term "a plurality of" refers to two or more, and other quantifiers are similar thereto.

[0075] Next, the technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0076] In the current NR system, the network side performs the transmission of DL-PRS beams, and the network side can obtain the spatial distribution of DL-PRS beams according to the information it has. However, the LMF and the UE do not have the spatial distribution information of the DL-PRS beams. In the DL-AoD positioning method, if the LMF or the UE can obtain detailed information on the spatial distribution of the DL-PRS beams, the accuracy of the DL-AoD positioning method can be improved.

[0077] However, the spatial distribution of each DL-PRS beam is different, and it must be described separately. Moreover, in order to accurately reflect the detailed information of the beam, each beam requires a large amount of data for description. Each TRP on the network side needs to send a plurality of DL-PRS beams. If the detailed distribution information of each DL-PRS beam is directly transmitted to the LMF or the UE, the amount of data to be transmitted will be extremely large.

[0078] To solve the above problems, the present application provides a method for determining the downlink departure angle, which realizes high-precision downlink departure angle positioning with a small amount of transmitted data. Figure 1 is one of the flow diagrams of the method for determining the downlink departure angle provided by the present application. As Figure 1 shown, the execution subject of this method is the network side, which can be a serving base station or a non-serving base station, etc. In this method, the subject for determining the downlink departure angle, that is, the positioning end, can be the LMF or the terminal. This method includes:

[0079] Step 110: Determine the beamforming parameters, antenna parameters used by the transceiver point (TRP) to transmit each downlink positioning reference signal (DL-PRS), and the difference parameters of the TRP. The difference parameters include the parameters indicating the differences in amplitude and phase of the transmission paths of each antenna element corresponding to the TRP.

[0080] Step 120: Transmit the beamforming parameters, antenna parameters, and difference parameters to the positioning end for the positioning end to determine the downlink departure angle based on the beamforming parameters, antenna parameters, and difference parameters.

[0081] Specifically, the transmission of the downlink positioning reference signal (DL-PRS) is implemented based on each transceiver point (TRP) on the network side. Through the beamforming parameters and antenna parameters of each TRP when transmitting the DL-PRS, the beam distribution of the DL-PRS in the ideal state can be deduced and calculated.

[0082] Furthermore, the beamforming parameters may include the shaping parameters of analog beamforming and the shaping parameters of digital beamforming. Among them, the shaping parameters of analog beamforming may include the gain and time delay added to the transmission signal for each antenna element when the transmission signal passes through the analog beamforming circuit. The shaping parameters of digital beamforming may include the precoding matrix of the codebook index for precoding. The antenna parameters are used to reflect the structural information of the transmitting antenna array, such as: the position of the antenna element, the shape and size of the antenna element, the spacing between antenna elements, etc.

[0083] When the TRP transmits the DL-PRS, it will be affected by non-ideal factors, resulting in a large deviation between the actual beam distribution of the DL-PRS transmitted by the TRP and the beam distribution in the ideal state. The difference parameters of the TRP, that is, the parameters that can reflect the non-ideal factors when the TRP transmits the DL-PRS. The difference parameters of the TRP include the parameters indicating the differences in amplitude and phase of the transmission paths of each antenna element of the TRP. Among them, the transmission path of the antenna element can be divided into three parts: the RF (Radio Frequency) channel, the RF channel to the antenna element, and the antenna element. The possible differences in amplitude and phase of each part can be reflected in the gain and time delay of each part. For example, the difference parameters may include the gain and time delay of each RF channel, and may also include the time delay from each RF channel to each antenna element, and may further include the gain of each antenna element. The embodiments of the present application do not make specific limitations on this.

[0084] Compared with directly sending the detailed beam distribution information of each TRP's DL-PRS to the positioning end, only sending the beamforming parameters, antenna parameters used for each DL-PRS, and the difference parameters of the TRP to the positioning end can greatly reduce the data transmission volume from the network side to the positioning end. After receiving the beamforming parameters, antenna parameters, and difference parameters, the positioning end can also deduce and calculate the actual DL-PRS beam distribution by combining these parameters, so as to achieve a more accurate positioning of the downlink departure angle. For example, the positioning end can calculate and deduce the DL-PRS beam distribution in the ideal state based on the beamforming parameters and antenna parameters, and correct the DL-PRS beam distribution in the ideal state based on the difference parameters, so as to obtain a more accurate and practical DL-PRS beam distribution, and determine the downlink departure angle based on the corrected DL-PRS beam distribution.

[0085] It should be noted that the sending of the beamforming parameters, antenna parameters, and difference parameters to the positioning end referred to in step 120 does not limit the order of these three types of parameters in data transmission. These three types of parameters can be sent to the positioning end by the network side in the same signaling, or can be sent to the positioning end by the network side in different signals at the same or different times respectively.

[0086] The method provided by the embodiments of the present application, by transmitting the beamforming parameters, antenna parameters of each DL-PRS, and the difference parameters of each TRP, while ensuring that the positioning end can obtain an accurate DL-PRS beam distribution, greatly reduces the data transmission volume from the network side to the positioning end, effectively improves the positioning accuracy of the downlink departure angle, and saves transmission resources at the same time.

[0087] Based on the above embodiments, the network side can be a serving base station or a non-serving base station, and the positioning end can be an LMF or a UE. Under different combinations of the network side and the positioning end, the specific implementation manner of step 120 is also different.

[0088] Based on any of the above embodiments, when the network side is a serving base station and the positioning end is a terminal, step 120 includes:

[0089] Based on at least one of the radio resource control (RRC) signaling, media access control control element (MAC-CE) signaling, and downlink control information (DCI) signaling, send the beamforming parameters, antenna parameters, and difference parameters to the terminal;

[0090] Alternatively, send the beamforming parameters, antenna parameters, and difference parameters to the positioning management function unit (LMF), and the LMF sends the beamforming parameters, antenna parameters, and difference parameters to the terminal based on the LTE positioning protocol (LPP) signaling.

[0091] Specifically, when the network side is the serving base station, the serving base station can directly communicate with the terminal, or can forward the transmission data to the terminal through the LMF.

[0092] For the case where the serving base station directly communicates with the terminal, the serving base station can send the beamforming parameters, antenna parameters, and differential parameters to the terminal through at least one of RRC (Radio Resource Control), MAC-CE (Medium Access Control-Control Element), and DCI (Downlink Control Information). Here, the transmission beamforming parameters, antenna parameters, and differential parameters can use the same signaling or different signaling. For example, the serving base station can transmit the beamforming parameters and antenna parameters through the RRC signaling and transmit the differential parameters through the DCI signaling, or can transmit the beamforming parameters, antenna parameters, and differential parameters through the RRC signaling.

[0093] For the case where the serving base station forwards data through the LMF, the serving base station can transmit the beamforming parameters, antenna parameters, and differential parameters to the LMF through the NRPPa (NR Positioning Protocol A) signaling. After receiving the above three parameters, the LMF then forwards the above three parameters to the terminal through the LPP (LTE Positioning Protocol) signaling. It should be noted that the serving base station can send the three parameters together or separately. Correspondingly, the LMF may receive the three parameters simultaneously or separately. The data forwarding of the LMF can be immediate forwarding upon reception or forwarding together after receiving the three parameters.

[0094] Based on any of the above embodiments, when the network side is a non-serving base station and the positioning end is the terminal, step 120 includes:

[0095] Sending the beamforming parameters, antenna parameters, and differential parameters to the serving base station, and the serving base station forwards the beamforming parameters, antenna parameters, and differential parameters to the terminal based on at least one of the radio resource control RRC signaling, medium access control control element MAC-CE signaling, and downlink control information DCI signaling;

[0096] Or, sending the beamforming parameters, antenna parameters, and differential parameters to the positioning management function unit LMF, and the LMF forwards the beamforming parameters, antenna parameters, and differential parameters to the terminal based on the LTE positioning protocol LPP signaling.

[0097] Specifically, when the network side is a non-serving base station, the non-serving base station needs to communicate with the terminal through the serving base station, or can also forward the transmission data to the terminal through the LMF.

[0098] For the case where the non-serving base station forwards data through the serving base station, the non-serving base station can send the beamforming parameter, antenna parameter, and difference parameter to the serving base station. After receiving the above three parameters, the serving base station then sends the above three parameters to the terminal through at least one of the RRC signaling, MAC-CE signaling, and DCI signaling. Here, when the serving base station performs forwarding, the beamforming parameter, antenna parameter, and difference parameter can be transmitted using the same signaling or different signaling. For example, the serving base station can transmit the beamforming parameter and antenna parameter through the RRC signaling and transmit the difference parameter using the DCI signaling, or can also transmit the beamforming parameter, antenna parameter, and difference parameter through the RRC signaling. It should be noted that the non-serving base station can send the three parameters together or separately. Correspondingly, the serving base station may receive the three parameters simultaneously or separately. The data forwarding of the serving base station can be immediate forwarding upon reception or forwarding together after receiving the three parameters.

[0099] For the case where the non-serving base station forwards data through the LMF, the non-serving base station can transmit the beamforming parameter, antenna parameter, and difference parameter to the LMF through the NRPPa signaling. After receiving the above three parameters, the LMF then forwards the above three parameters to the terminal through the LPP signaling. It should be noted that the non-serving base station can send the three parameters together or separately. Correspondingly, the LMF may receive the three parameters simultaneously or separately. The data forwarding of the LMF can be immediate forwarding upon reception or forwarding together after receiving the three parameters.

[0100] Based on any of the above embodiments, when the positioning end is the positioning management function unit LMF, step 120 includes:

[0101] Based on the new radio positioning protocol A, send the beamforming parameter, antenna parameter, and difference parameter to the LMF.

[0102] Specifically, for the case where the positioning end is the LMF, regardless of whether the network side is a serving base station or a non-serving base station, it can directly communicate with the LMF. The data transmission from the network side to the LMF can be achieved through the new radio positioning protocol A, that is, NRPPa.

[0103] Based on any of the above embodiments, the differential parameter includes at least one of the gain-delay information corresponding to each radio frequency (RF) channel in the TRP, the delay information from each RF channel to each antenna element, and the gain information of each antenna element.

[0104] Among them, the gain-delay information of the RF channel is used to indicate the gain and delay of the RF channel. The gain and delay can be the absolute values of each RF channel or the relative values with respect to a specific RF channel. The specific RF channel referred to here can be the first channel or a dedicated calibration channel, or a pre-specified channel. The gain and delay of the RF channel can be obtained through a dedicated calibration circuit.

[0105] The delay information from the RF channel to each antenna element is used to indicate the delay from the RF channel to each antenna element. The delay can be the absolute value from the RF channel to each antenna element or the relative value with respect to a specific antenna element. The specific antenna element referred to here can be the first antenna element or a dedicated calibration antenna element, or a pre-specified antenna element. The delay from the RF channel to each antenna element can be obtained through a dedicated calibration circuit.

[0106] The gain information of the antenna element is used to indicate the gain of the antenna element. The gain can be the absolute value of each antenna element or the relative value with respect to a specific antenna element. The specific antenna element referred to here can be the first antenna element or a dedicated calibration antenna element, or a pre-specified antenna element. The gain of the antenna element can be provided by the antenna manufacturer or can be pre-measured by an instrument and stored on the network side.

[0107] Based on any of the above embodiments, Figure 2 is the second schematic flow diagram of the downlink departure angle determination method provided by this application. As Figure 2 shown, the execution subject of this method is the positioning end, which can be the LMF or the terminal. This method includes:

[0108] Step 210: Receive the beamforming parameters and antenna parameters used by each transceiver point (TRP) to send each downlink positioning reference signal (DL-PRS), and the differential parameters of the TRP. The differential parameters include the parameters indicating the differences in amplitude and phase of the transmission paths of each antenna element corresponding to the TRP;

[0109] Step 220: Determine the downlink departure angle based on the beamforming parameters, antenna parameters, and differential parameters.

[0110] Specifically, the transmission of the downlink positioning reference signal (DL-PRS) is implemented based on each transmission and reception point (TRP) on the network side. By means of the beamforming parameters and antenna parameters of each TRP when transmitting the DL-PRS, the DL-PRS beam distribution in the ideal state can be deduced and calculated.

[0111] Furthermore, the beamforming parameters may include the beamforming parameters of analog beamforming and the beamforming parameters of digital beamforming. Among them, the beamforming parameters of analog beamforming may include the gain and time delay added to the transmitted signal for each antenna element when the transmitted signal passes through the analog beamforming circuit. The beamforming parameters of digital beamforming may include the precoding matrix of the codebook index for precoding. The antenna parameters are used to reflect the structural information of the transmitting antenna array. For example: the position of the antenna elements, the shape and size of the antenna elements, the spacing between the antenna elements, etc.

[0112] When the TRP transmits the DL-PRS, it will be affected by non-ideal factors, resulting in a large deviation between the actual beam distribution of the DL-PRS transmitted by the TRP and the beam distribution in the ideal state. The difference parameters of the TRP are the parameters that can reflect the non-ideal factors when the TRP transmits the DL-PRS. The difference parameters of the TRP include the parameters that there are differences in amplitude and phase in the transmission paths of each antenna element of the TRP. Among them, the transmission path of the antenna element can be divided into three parts: the RF (Radio Frequency) channel, the RF channel to the antenna element, and the antenna element. The possible differences in amplitude and phase in each part can be reflected in the gain and time delay of each part. For example, the difference parameters may include the gain and time delay of each RF channel, and may also include the time delay from each RF channel to each antenna element, and may further include the gain of each antenna element. The embodiments of the present application do not make specific limitations thereto.

[0113] Compared with the network side directly sending the detailed beam distribution information of each TRP transmitting the DL-PRS to the positioning terminal, the network side only sends the beamforming parameters, antenna parameters, and difference parameters of each TRP when transmitting each DL-PRS to the positioning terminal, which can greatly reduce the data transmission volume from the network side to the positioning terminal. After receiving the beamforming parameters, antenna parameters, and difference parameters, the positioning terminal can also deduce and calculate the actual DL-PRS beam distribution by combining the beamforming parameters, antenna parameters, and difference parameters, so as to achieve a more accurate positioning of the downlink departure angle. For example, the positioning terminal can calculate and deduce the DL-PRS beam distribution in the ideal state based on the beamforming parameters and antenna parameters, correct the DL-PRS beam distribution in the ideal state based on the difference parameters, so as to obtain a more accurate and practical DL-PRS beam distribution, and determine the downlink departure angle based on the corrected DL-PRS beam distribution.

[0114] It should be noted that the beamforming parameters, antenna parameters, and difference parameters referred to in step 210 do not limit the order of these three types of parameters in data transmission. These three types of parameters can be carried by the network side in the same signaling and transmitted to the positioning end together, or can be carried by the network side in different signaling and transmitted to the positioning end separately at the same or different times.

[0115] The method provided by the embodiments of the present application, by transmitting the beamforming parameters, antenna parameters of each DL-PRS, and the difference parameters of each TRP, on the premise of ensuring that the positioning end can obtain an accurate DL-PRS beam distribution, greatly reduces the data transmission volume from the network side to the positioning end, effectively improves the positioning accuracy of the downlink departure angle, and saves transmission resources at the same time.

[0116] Based on any of the above embodiments, step 220 includes:

[0117] Step 221, based on the beamforming parameters and antenna parameters, determine the first beam space distribution information of the DL-PRS.

[0118] Step 222, based on the difference parameters, correct the first beam space distribution information to obtain the second beam space distribution information.

[0119] Step 223, based on the second beam space distribution information, determine the downlink departure angle.

[0120] Specifically, the positioning end can deduce and calculate the DL-PRS beam distribution in the ideal state based on the beamforming parameters and antenna parameters of each TRP that sends the DL-PRS, which is denoted as the first beam space distribution information here.

[0121] Considering that when the TRP sends the DL-PRS, it will be affected by non-ideal factors, resulting in a large deviation between the actual beam distribution of the TRP when sending the DL-PRS and the beam distribution in the ideal state. Therefore, it is necessary to apply the difference parameters received that can reflect the non-ideal factors when the TRP sends the DL-PRS to correct the deduced first beam space distribution information in the ideal state, so as to obtain the theoretically beam space distribution considering non-ideal factors, which is denoted as the second beam space distribution information here.

[0122] After obtaining the second beam space distribution information, the downlink departure angle can be calculated therefrom, so as to realize the accurate positioning of the downlink departure angle.

[0123] Based on any of the above embodiments, step 221 includes:

[0124] Based on the beamforming parameters, determine the beamforming matrix;

[0125] Determine the antenna array steering matrix based on the antenna parameters;

[0126] Determine the first beam spatial distribution information based on the beamforming matrix and the antenna array steering matrix.

[0127] Specifically, the beamforming parameters may include the shaping parameters of analog beamforming and the shaping parameters of digital beamforming. Among them, the shaping parameters of analog beamforming may include the gain and delay added to the transmitted signal for each antenna element when the transmitted signal passes through the analog beamforming circuit. The analog beamforming matrix can be obtained through the shaping parameters of analog beamforming. The shaping parameters of digital beamforming may include the precoding matrix of the codebook index for precoding. Combining the analog beamforming matrix and the precoding matrix can determine the beamforming matrix, which can be specifically expressed by the following formula:

[0128] W = AD;

[0129] In the formula, W is the beamforming matrix, A is the analog beamforming matrix obtained based on the analog beamforming parameters, and D is the precoding matrix included in the digital beamforming parameters.

[0130] Furthermore, the analog beamforming matrix A is expressed as the following formula:

[0131]

[0132] Among them, for an antenna array with Q antenna elements, when the beam is expected to be transmitted in a certain spatial angle, the shaping parameters of analog beamforming include: the gain a l and the delay τ l added to the transmitted signal for each antenna element when the transmitted signal passes through the analog beamforming circuit. Here, l represents the l-th antenna element. ω0 is the carrier frequency of the transmitted signal.

[0133] The antenna parameters are used to reflect the structural information of the transmitting antenna array, such as: the position of the antenna elements, the shape and size of the antenna elements, the spacing between the antenna elements, etc. Through the antenna parameters, the antenna array steering matrix can be calculated as shown in the following formula:

[0134]

[0135] In the formula, F is the antenna array steering matrix, Q is the total number of antenna elements in the antenna array, and P is the total number of transmitting angles of the antenna array. φ li is the phase of the l-th antenna element at the i-th transmitting angle, where φ li The specific form of is related to the structure and parameters of the antenna array in the antenna parameters. For example, for a uniform linear array, at the i-th transmitting angle:

[0136]

[0137] where d represents the spacing between antenna elements, and θ i represents the angular size of the i-th transmission angle. λ represents the wavelength of the transmitted signal.

[0138] On this basis, by combining the beamforming matrix W and the antenna array steering matrix F, the first beam spatial distribution information corr in the ideal state can be calculated as follows:

[0139] corr = conj(W)*F

[0140] Based on any of the above embodiments, step 222 includes:

[0141] Constructing a calibration matrix based on the difference parameter;

[0142] Based on the calibration matrix, calibrating the first beam spatial distribution information to obtain the second beam spatial distribution information.

[0143] Specifically, according to the received difference parameter, the positioning end can obtain the differences in RF channel gains, the delay differences of the transmitted signals reaching each antenna element, and the gain differences of each antenna element in the actual situation. Based on this, the positioning end can calculate the calibration factor for the gain of each antenna element and the calibration factor for the delay of each antenna element, and thus construct the calibration matrix.

[0144] After obtaining the calibration matrix, the calibration matrix can be applied to calibrate the first beam spatial distribution information in the ideal state from both the gain and delay aspects, so as to obtain the second beam spatial distribution information that can reflect the actual situation after calibration.

[0145] Furthermore, the calibration matrix can be expressed in the following form:

[0146]

[0147] In the formula, C is the calibration matrix, and g l represents the gain calibration factor of the l-th antenna element, and τ' l represents the delay calibration factor of the l-th antenna element, where g l can be expressed in the following form:

[0148] g l =(g_ant l +g_ch l )

[0149] where g_ant l is the gain of the l-th antenna element, and g_ch lis the gain of the RF channel corresponding to the l-th antenna element;

[0150] τ′ l can be the time delay of the RF channel reaching the l-th antenna element.

[0151] After obtaining the calibration matrix C, the second beam space distribution information obtained by calibration based on the calibration matrix can be expressed as:

[0152] corr′ = corr * C

[0153] In the formula, corr′ is the second beam space distribution information.

[0154] Based on any of the above embodiments, step 223 includes:

[0155] Based on the reference signal receiving power (RSRP) distribution information of DL-PRS, calibrate the second beam space distribution information to obtain the third beam space distribution information;

[0156] Based on the third beam space distribution information, determine the downlink departure angle.

[0157] Specifically, the second beam space distribution information obtained by applying the difference parameter still reflects the spatial distribution in the theoretical state. To further improve the reliability and accuracy of the beam space distribution, the RSRP (Reference Signal Receiving Power) distribution information of DL-PRS obtained from actual measurements can be combined to calibrate the second beam space distribution information in the theoretical state, thereby obtaining the further calibrated beam space distribution information, denoted here as the third beam space distribution information.

[0158] Here, the RSRP distribution information used to calibrate the beam space distribution is obtained by combining the RSRP, receiving position of each reference terminal measured for DL-PRS, and the position of the TRP antenna that transmits DL-PRS. For any DL-PRS beam, the reference terminal can report the position information of each receiving position, and the network side reports the antenna position of the TRP. The positioning end can calculate the angle size of the line connecting the receiving position of each reference terminal and the TRP antenna from this, that is, the angle of beam emission. In addition, the reference terminal can also report the RSRP received at each receiving position. The positioning end obtains the beam power spatial distribution at the receiving position, that is, the RSRP distribution information, based on the RSRP and beam emission angle at each receiving position.

[0159] Calibration based on the RSRP distribution information can eliminate the mutual coupling effect between the TRP antenna elements and the influence of the installation error of the TRP antenna array on the estimation of the beam space distribution information, so as to obtain more accurate beam space distribution information, and further improve the positioning accuracy of the downlink departure angle.

[0160] Based on any of the above embodiments, in step 223, based on the reference signal received power RSRP distribution information of the DL-PRS, the second beam space distribution information is calibrated to obtain the third beam space distribution information, including:

[0161] Based on the RSRP distribution information and the second beam space distribution information, determine the beam residual angle deviation of the second beam space distribution information;

[0162] Based on the beam residual angle deviation, calibrate the second beam space distribution information to obtain the third beam space distribution information.

[0163] Specifically, when performing beam space distribution calibration based on the RSRP distribution information, the RSRP distribution information can be compared with the second beam space distribution information to determine the residual angle deviation existing in the second beam space distribution information, that is, the beam residual angle deviation. Here, the beam residual angle deviation reflects the deviation between the theoretically derived beam distribution and the actually measured beam distribution.

[0164] After obtaining the beam residual angle deviation, the second beam space distribution information in the theoretical state can be calibrated based on the beam residual angle deviation to obtain the calibrated beam space distribution information, which is denoted as the third beam space distribution information here.

[0165] Based on any of the above embodiments, in step 223, the RSRP distribution information used to calibrate the beam space distribution is obtained by combining the RSRP, the receiving position measured by each reference terminal, and the position of the TRP antenna transmitting the DL-PRS. When the positioning end is the LMF or the terminal, the methods for obtaining the receiving position of the reference terminal and the RSRP measured at the receiving position are also different.

[0166] When the positioning end is the positioning management function unit LMF, before step 223 is executed, it further includes:

[0167] Receive the reference signal received power RSRP and the receiving position of the DL-PRS sent by the reference terminal;

[0168] Based on the RSRP and the receiving position of the DL-PRS, and the position of the antenna of the TRP corresponding to the DL-PRS, determine the RSRP distribution information.

[0169] Specifically, when the positioning end is the LMF, since the reference terminal can directly communicate with the LMF, both the receiving position of the reference terminal and the RSRP measured at the receiving position can be directly transmitted to the LMF. Further, the data transmission between the reference terminal and the LMF can be implemented through LPP signaling.

[0170] When the positioning end is a terminal, before step 223 is executed, it further includes:

[0171] Receiving the reference signal receiving power (RSRP) and the receiving position of the DL-PRS forwarded by the reference terminal through the positioning management function unit (LMF) or the network side;

[0172] Based on the RSRP and the receiving position of the DL-PRS, and the antenna position of the corresponding TRP of the DL-PRS, determining the RSRP distribution information.

[0173] Specifically, when the positioning end is a terminal, the reference terminal and the terminal at the positioning end cannot directly communicate. Therefore, it is necessary for the reference terminal to forward the receiving position to be transmitted and the RSRP measured at the receiving position to the terminal at the positioning end through the LMF or the network side.

[0174] Further, in the solution based on forwarding through the LMF, both between the reference terminal and the LMF, and between the LMF and the terminal at the positioning end, can communicate through LPP signaling; in the method based on forwarding through the network side, the reference terminal can first report the receiving position and the RSRP to the network side, and then the network side forwards the receiving position and the RSRP to the terminal at the positioning end through at least one of RRC signaling, MAC-CE signaling, and DCI signaling.

[0175] Based on any of the above embodiments, the network side can be a serving base station or a non-serving base station, and the positioning end can be an LMF or a UE. Under different combinations of the network side and the positioning end, the specific implementation manner of step 210 is also different.

[0176] Based on any of the above embodiments, when the positioning end is the positioning management function unit (LMF), step 210 includes:

[0177] Based on the new radio positioning protocol A, receiving the beamforming parameters, antenna parameters, and difference parameters sent by the network side.

[0178] Specifically, for the case where the positioning end is the LMF, whether the network side is a serving base station or a non-serving base station, it can directly communicate with the LMF. The data transmission from the network side to the LMF can be implemented through the new radio positioning protocol A, that is, NRPPa.

[0179] Based on any of the above embodiments, when the positioning end is a terminal, step 210 includes:

[0180] Receive the beamforming parameters, antenna parameters, and differential parameters sent by the serving base station based on at least one of Radio Resource Control (RRC) signaling, Medium Access Control Control Element (MAC-CE) signaling, and Downlink Control Information (DCI) signaling. The beamforming parameters, antenna parameters, and differential parameters are determined by the serving base station or sent to the serving base station after being determined by a non-serving base station.

[0181] Alternatively, receive the beamforming parameters, antenna parameters, and differential parameters forwarded by the Location Management Function (LMF) based on LTE Positioning Protocol (LPP) signaling. The beamforming parameters, antenna parameters, and differential parameters are sent by the base station to the LMF.

[0182] Specifically, for the case where the positioning end is a terminal, when the network side is the serving base station, the serving base station can communicate directly with the terminal or forward the transmission data to the terminal through the LMF. At this time, the beamforming parameters, antenna parameters, and differential parameters are all determined by the serving base station.

[0183] Furthermore, for the case where the serving base station communicates directly with the terminal, the serving base station can send the beamforming parameters, antenna parameters, and differential parameters to the terminal through at least one of RRC, MAC-CE, and DCI. Correspondingly, the terminal receives the beamforming parameters, antenna parameters, and differential parameters sent by the serving base station through at least one of RRC, MAC-CE, and DCI. Here, the beamforming parameters, antenna parameters, and differential parameters can be transmitted using the same signaling or different signaling. For example, the serving base station can transmit the beamforming parameters and antenna parameters through RRC signaling and transmit the differential parameters through DCI signaling, or can transmit the beamforming parameters, antenna parameters, and differential parameters through RRC signaling.

[0184] For the case where the serving base station forwards data through the LMF, the serving base station can transmit the beamforming parameters, antenna parameters, and differential parameters to the LMF through NRPPa signaling. After receiving the above three parameters, the LMF then forwards the above three parameters to the terminal through LPP signaling. Correspondingly, the terminal receives the three parameters forwarded by the LMF through LPP. It should be noted that the serving base station can send the three parameters together or separately. Correspondingly, the LMF may receive the three parameters simultaneously or separately. The data forwarding of the LMF can be immediate forwarding upon receipt or forwarding after receiving the three parameters together.

[0185] When the network side is a non-serving base station, the non-serving base station needs to communicate with the terminal through the serving base station or forward the transmission data to the terminal through the LMF. At this time, the beamforming parameters, antenna parameters, and differential parameters are all determined by the non-serving base station.

[0186] For the case where the non-serving base station forwards data through the serving base station, the non-serving base station may send beamforming parameters, antenna parameters, and differential parameters to the serving base station. After receiving the above three parameters, the serving base station then sends the above three parameters to the terminal through at least one of RRC signaling, MAC-CE signaling, and DCI signaling. Correspondingly, the terminal receives the beamforming parameters, antenna parameters, and differential parameters forwarded by the serving base station through at least one of RRC, MAC-CE, and DCI. Here, when the serving base station performs forwarding, the beamforming parameters, antenna parameters, and differential parameters may be transmitted using the same signaling or different signaling. For example, the serving base station may transmit the beamforming parameters and antenna parameters through RRC signaling and transmit the differential parameters through DCI signaling, or may transmit the beamforming parameters, antenna parameters, and differential parameters through RRC signaling. It should be noted that the non-serving base station may send the three parameters together or separately. Correspondingly, the serving base station may receive the three parameters simultaneously or separately, and the data forwarding of the serving base station may be immediate forwarding upon receipt or may be forwarded together after receiving the three parameters.

[0187] For the case where the non-serving base station forwards data through the LMF, the non-serving base station may transmit the beamforming parameters, antenna parameters, and differential parameters to the LMF through NRPPa signaling. After receiving the above three parameters, the LMF then forwards the above three parameters to the terminal through LPP signaling. Correspondingly, the terminal receives the three parameters forwarded by the LMF through LPP. It should be noted that the non-serving base station may send the three parameters together or separately. Correspondingly, the LMF may receive the three parameters simultaneously or separately, and the data forwarding of the LMF may be immediate forwarding upon receipt or may be forwarded together after receiving the three parameters.

[0188] Based on any of the above embodiments, the differential parameters include at least one of the gain-delay information for each radio frequency (RF) channel in the corresponding TRP, the delay information from each RF channel to each antenna element, and the gain information of each antenna element.

[0189] Among them, the gain-delay information of the RF channel is used to indicate the gain and delay of the RF channel. The gain and delay may be the absolute values of each RF channel or relative values relative to a specific RF channel. The specific RF channel referred to here may be the first channel or a dedicated calibration channel, or may be a pre-specified channel. The gain and delay of the RF channel can be obtained through a dedicated calibration circuit.

[0190] The time delay information of the RF channel to each antenna element is used to indicate the time delay from the RF channel to each antenna element. The time delay can be the absolute value of the RF channel to each antenna element, or the relative value with respect to a specific antenna element. The specific antenna element referred to here can be the first antenna element or the dedicated calibration antenna element, or an antenna element specified in advance. The time delay of the RF channel to each antenna element can be obtained through a dedicated calibration circuit.

[0191] The gain information of the antenna element is used to indicate the gain of the antenna element. The gain can be the absolute value of each antenna element, or the relative value with respect to a specific antenna element. The specific antenna element referred to here can be the first antenna element or the dedicated calibration antenna element, or an antenna element specified in advance. The gain of the antenna element can be provided by the antenna manufacturer, or can be measured in advance by an instrument and stored on the network side.

[0192] Based on any of the above embodiments, when the positioning end is the LMF, the method for determining the downlink departure angle includes:

[0193] First, the network side reports the shaping parameters of the analog beamforming of the TRP transmitter to the LMF.

[0194] After receiving the shaping parameters of the analog beamforming, the LMF can construct an analog beamforming matrix based on the shaping parameters of the analog beamforming.

[0195] In addition, the network side also reports the digital beamforming parameters of the TRP transmitter to the LMF.

[0196] After receiving the digital beamforming parameters, the LMF can combine the digital beamforming parameters and the analog beamforming matrix to establish a beamforming matrix W.

[0197] Furthermore, the network side also reports the antenna parameters of the TRP transmitter to the LMF.

[0198] After receiving the antenna parameters, the LMF can calculate the steering matrix F of the antenna array based on the antenna parameters. And on this basis, the LMF combines the beamforming matrix W and the steering matrix F of the antenna array to obtain the first beam space distribution information in the ideal state.

[0199] In particular, the network side also needs to obtain the difference parameters and report them to the LMF. Here, the difference parameters include the gain time delay information of each radio frequency (RF) channel that can be obtained based on the calibration circuit, the time delay information of each RF channel to each antenna element, and the gain information of each antenna element provided by the manufacturer or measured in advance.

[0200] The LMF can obtain the differences between the true RF channel gains, the delay differences of the transmitted signals reaching each antenna element, and the gain differences of each antenna element based on the received differential parameters. Based on this, the LMF can calculate the gain correction factor for each antenna element and the delay correction factor for each antenna element, and thus construct the correction matrix C.

[0201] Subsequently, the LMF can correct the first beam space distribution information in the ideal state through the correction matrix C, so as to obtain the second beam space distribution information in the theoretical state. This step fully considers the influence of the differential parameters of the TRP transmitter and can effectively improve the accuracy of the beam distribution information.

[0202] In addition, a reference terminal can be placed at different positions in the DL-PRS beam coverage area to measure the RSRP, and report the coordinates of each receiving position and the corresponding RSRP measurement value to the LMF. The LMF thus obtains the RSRP of the DL-PRS beam at some known positions.

[0203] On this basis, the LMF compares the second beam space distribution information containing the influence of the TRP transmitter inconsistency parameters with the RSRP distribution information of the DL-PRS beam at some known positions obtained in the previous step, and can obtain the beam residual angle deviation of the second beam space distribution information. Based on this beam residual angle deviation, the second beam space distribution information can be further calibrated to obtain more accurate third beam space distribution information and accurate beam angle information.

[0204] Finally, based on the third beam space distribution information and combined with the RSRP measurement value reported by the terminal, the LMF can obtain the accurate AoD angle information of the terminal position.

[0205] Based on any of the above embodiments, when the positioning end is a terminal, the method for determining the downlink departure angle includes:

[0206] First, the network side sends the shaping parameters of the analog beamforming of the TRP transmitter to the terminal.

[0207] After receiving the shaping parameters of the analog beamforming, the terminal can construct an analog beamforming matrix based on the shaping parameters of the analog beamforming.

[0208] In addition, the network side also sends the digital beamforming parameters of the TRP transmitter to the terminal.

[0209] After receiving the digital beamforming parameters, the terminal can combine the digital beamforming parameters and the analog beamforming matrix to establish a beamforming matrix W.

[0210] Furthermore, the network side also sends the antenna parameters of the TRP transmitter to the terminal.

[0211] After receiving the antenna parameters, the terminal can calculate the steering matrix F of the antenna array based on the antenna parameters. Furthermore, on this basis, by combining the beamforming matrix W and the steering matrix F of the antenna array, the terminal can obtain the first beam space distribution information in the ideal state.

[0212] In particular, the network side also needs to obtain the difference parameters and send them to the terminal. Here, the difference parameters include the gain-delay information of each radio frequency (RF) channel that can be obtained based on the calibration circuit, the delay information from each RF channel to each antenna element, and the gain information of each antenna element provided by the manufacturer or pre-measured.

[0213] The terminal can know the differences between the real RF channel gains, the delay differences of the transmitted signals reaching each antenna element, and the gain differences of each antenna element according to the received difference parameters. Based on this, the terminal can calculate the gain correction factor and the delay correction factor for each antenna element, and thus construct the correction matrix C.

[0214] Subsequently, the terminal can correct the first beam space distribution information in the ideal state through the correction matrix C, so as to obtain the second beam space distribution information in the theoretical state. This step fully considers the influence of the difference parameters of the TRP transmitter and can effectively improve the accuracy of the beam distribution information.

[0215] In addition, a reference terminal can be placed at different positions in the DL-PRS beam coverage area to measure the RSRP, and the coordinates of each receiving position and the corresponding RSRP measurement values are forwarded to the terminal by the network side or the LMF. Thus, the terminal obtains the RSRP of the DL-PRS beam at some known positions.

[0216] On this basis, the terminal compares the second beam space distribution information containing the influence of the TRP transmitter inconsistency parameters with the RSRP distribution information of the DL-PRS beam at some known positions obtained in the previous step, and can obtain the beam residual angle deviation of the second beam space distribution information. Based on this beam residual angle deviation, the second beam space distribution information can be further calibrated to obtain a more accurate third beam space distribution information and accurate beam angle information.

[0217] Finally, based on the third beam space distribution information and combining the RSRP measurement values measured by the terminal itself, the terminal can obtain the accurate AoD angle information of its own position.

[0218] Figure 3 It is a schematic structural diagram of the network side provided by this application, as Figure 3 shown, the network side includes a memory 320, a transceiver 300, and a processor 310:

[0219] A memory 320 for storing computer programs; a transceiver 300 for transmitting and receiving data under the control of the processor; a processor 310 for reading the computer programs in the memory and performing the following operations:

[0220] Determine the beamforming parameters and antenna parameters used by the transceiver point TRP to transmit each downlink positioning reference signal DL-PRS, and the difference parameters of the TRP, where the difference parameters include parameters indicating differences in amplitude and phase of the transmission paths of the respective antenna elements corresponding to the TRP;

[0221] Send the beamforming parameters, the antenna parameters, and the difference parameters to the positioning end for the positioning end to determine the downlink departure angle based on the beamforming parameters, the antenna parameters, and the difference parameters.

[0222] Among them, in Figure 3 The bus architecture may include any number of interconnected buses and bridges, specifically various circuits of one or more processors represented by the processor 310 and the memory represented by the memory 320 are linked together. The bus architecture can also link together various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art, and thus will not be further described herein. The bus interface provides an interface. The transceiver 300 may be multiple components, that is, including a transmitter and a receiver, and provides a unit for communicating with various other devices on a transmission medium, and these transmission mediums include wireless channels, wired channels, optical cables, and other transmission mediums.

[0223] The processor 310 is responsible for managing the bus architecture and general processing, and the memory 320 can store the data used by the processor 310 when performing operations.

[0224] Optionally, the processor 310 may be a CPU (Central Processing Unit), ASIC (Application Specific Integrated Circuit), FPGA (Field-Programmable Gate Array), or CPLD (Complex Programmable Logic Device), and the processor may also adopt a multi-core architecture.

[0225] The processor is used to execute any of the methods provided in the embodiments of the present application according to the obtained executable instructions by calling the computer programs stored in the memory. The processor and the memory may also be physically separated.

[0226] Optionally, when the network side is the serving base station and the positioning end is the terminal, the sending of the beamforming parameter, the antenna parameter, and the difference parameter to the positioning end includes:

[0227] Based on at least one of Radio Resource Control (RRC) signaling, Medium Access Control Control Element (MAC-CE) signaling, and Downlink Control Information (DCI) signaling, sending the beamforming parameter, the antenna parameter, and the difference parameter to the terminal;

[0228] Alternatively, sending the beamforming parameter, the antenna parameter, and the difference parameter to the Location Management Function (LMF), and the LMF sends the beamforming parameter, the antenna parameter, and the difference parameter to the terminal based on the LTE Positioning Protocol (LPP) signaling.

[0229] Optionally, when the network side is a non-serving base station and the positioning end is the terminal, the sending of the beamforming parameter, the antenna parameter, and the difference parameter to the positioning end includes:

[0230] Sending the beamforming parameter, the antenna parameter, and the difference parameter to the serving base station, and the serving base station forwards the beamforming parameter, the antenna parameter, and the difference parameter to the terminal based on at least one of Radio Resource Control (RRC) signaling, Medium Access Control Control Element (MAC-CE) signaling, and Downlink Control Information (DCI) signaling;

[0231] Alternatively, sending the beamforming parameter, the antenna parameter, and the difference parameter to the Location Management Function (LMF), and the LMF forwards the beamforming parameter, the antenna parameter, and the difference parameter to the terminal based on the LTE Positioning Protocol (LPP) signaling.

[0232] Optionally, when the positioning end is the Location Management Function (LMF), the sending of the beamforming parameter, the antenna parameter, and the difference parameter to the positioning end includes:

[0233] Based on the New Radio positioning protocol A, sending the beamforming parameter, the antenna parameter, and the difference parameter to the LMF.

[0234] Optionally, the difference parameter includes at least one of the gain-delay information corresponding to each radio frequency (RF) channel in the transmit-receive point (TRP), the delay information from each RF channel to each antenna element, and the gain information of each antenna element.

[0235] It should be noted here that the above network side provided by the embodiments of the present application can implement all the method steps implemented by the method embodiments with the network side as the execution subject, and can achieve the same technical effects. Therefore, the same parts and beneficial effects as those in the method embodiments will not be specifically described herein again.

[0236] Figure 4 is a schematic structural diagram of the positioning end provided by the present application. As Figure 4 shown, the positioning end includes a memory 420, a transceiver 400, and a processor 410:

[0237] The memory 420 is used to store computer programs; the transceiver 400 is used to transmit and receive data under the control of the processor 410; the processor 410 is used to read the computer programs in the memory 420 and perform the following operations:

[0238] Receive the beamforming parameters and antenna parameters used by each transceiver point (TRP) to send each downlink positioning reference signal (DL-PRS), and the difference parameters of the TRP, where the difference parameters include the parameters indicating the differences in amplitude and phase of the emission paths of the respective antenna elements corresponding to the TRP;

[0239] Determine the downlink departure angle based on the beamforming parameters, the antenna parameters, and the difference parameters.

[0240] Specifically, the transceiver 400 is used to receive and transmit data under the control of the processor 410.

[0241] Among them, in Figure 4 , the bus architecture may include any number of interconnected buses and bridges. Specifically, various circuits represented by one or more processors represented by the processor 410 and the memory represented by the memory 420 are linked together. The bus architecture can also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art. Therefore, they will not be further described herein. The bus interface provides an interface. The transceiver 400 may be multiple elements, that is, including a transmitter and a receiver, and provides a unit for communicating with various other devices on a transmission medium, which includes wireless channels, wired channels, optical fiber cables, and other transmission media. For different user devices, the user interface 430 may also be an interface capable of externally connecting or internally connecting required devices, and the connected devices include, but are not limited to, a keypad, a display, a speaker, a microphone, a joystick, etc.

[0242] The processor 410 is responsible for managing the bus architecture and general processing, and the memory 420 can store the data used by the processor 410 when performing operations.

[0243] Optionally, the processor 410 may be a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a CPLD (Complex Programmable Logic Device). The processor may also adopt a multi-core architecture.

[0244] The processor is used to execute any of the methods provided in the embodiments of the present application according to the obtained executable instructions by calling the computer program stored in the memory. The processor and the memory may also be physically separated.

[0245] Optionally, determining the downlink departure angle based on the beamforming parameter, the antenna parameter, and the difference parameter includes:

[0246] Determining first beam space distribution information of the DL-PRS based on the beamforming parameter and the antenna parameter;

[0247] Correcting the first beam space distribution information based on the difference parameter to obtain second beam space distribution information;

[0248] Determining the downlink departure angle based on the second beam space distribution information.

[0249] Optionally, determining the first beam space distribution information of the DL-PRS based on the beamforming parameter and the antenna parameter includes:

[0250] Determining a beamforming matrix based on the beamforming parameter;

[0251] Determining an antenna array steering matrix based on the antenna parameter;

[0252] Determining the first beam space distribution information based on the beamforming matrix and the antenna array steering matrix.

[0253] Optionally, correcting the first beam space distribution information based on the difference parameter to obtain second beam space distribution information includes:

[0254] Constructing a correction matrix based on the difference parameter;

[0255] Correcting the first beam space distribution information based on the correction matrix to obtain second beam space distribution information.

[0256] Optionally, determining the downlink departure angle based on the second beam space distribution information includes:

[0257] Based on the reference signal received power (RSRP) distribution information of the DL-PRS, correct the second beam spatial distribution information to obtain the third beam spatial distribution information;

[0258] Based on the third beam spatial distribution information, determine the downlink departure angle.

[0259] Optionally, the step of correcting the second beam spatial distribution information based on the reference signal received power (RSRP) distribution information of the DL-PRS to obtain the third beam spatial distribution information includes:

[0260] Based on the RSRP distribution information and the second beam spatial distribution information, determine the beam residual angle deviation of the second beam spatial distribution information;

[0261] Based on the beam residual angle deviation, correct the second beam spatial distribution information to obtain the third beam spatial distribution information.

[0262] Optionally, when the positioning end is the Location Management Function (LMF), before the step of correcting the second beam spatial distribution information based on the reference signal received power (RSRP) distribution information of the DL-PRS to obtain the third beam spatial distribution information, it further includes:

[0263] Receive the reference signal received power (RSRP) and the receiving location of the DL-PRS sent by the reference terminal;

[0264] Based on the RSRP and the receiving location of the DL-PRS, and the antenna location of the corresponding Transmission and Reception Point (TRP) of the DL-PRS, determine the RSRP distribution information.

[0265] Optionally, when the positioning end is the terminal, before the step of correcting the second beam spatial distribution information based on the reference signal received power (RSRP) distribution information of the DL-PRS to obtain the third beam spatial distribution information, it further includes:

[0266] Receive the reference signal received power (RSRP) and the receiving location of the DL-PRS forwarded by the reference terminal through the Location Management Function (LMF) or the network side;

[0267] Based on the RSRP and the receiving location of the DL-PRS, and the antenna location of the corresponding Transmission and Reception Point (TRP) of the DL-PRS, determine the RSRP distribution information.

[0268] Optionally, when the positioning end is the Location Management Function (LMF), the step of receiving the beamforming parameters, antenna parameters, and the differential parameters of the TRP used for each Downlink Positioning Reference Signal (DL-PRS) sent by the Transmission and Reception Point (TRP) includes:

[0269] Based on the new air interface positioning protocol A, receive the beamforming parameters, the antenna parameters, and the difference parameters sent by the network side.

[0270] Optionally, when the positioning end is a terminal, the beamforming parameters and antenna parameters used by the receiving transceiver point TRP to send each downlink positioning reference signal DL-PRS, and the difference parameters of the TRP, include:

[0271] Receive the beamforming parameters, the antenna parameters, and the difference parameters sent by the serving base station based on at least one of radio resource control RRC signaling, media access control control element MAC-CE signaling, and downlink control information DCI signaling, where the beamforming parameters, the antenna parameters, and the difference parameters are determined by the serving base station or sent to the serving base station after being determined by a non-serving base station;

[0272] Alternatively, receive the beamforming parameters, the antenna parameters, and the difference parameters forwarded by the positioning management function unit LMF based on LTE positioning protocol LPP signaling, where the beamforming parameters, the antenna parameters, and the difference parameters are sent by the base station to the LMF.

[0273] Optionally, the difference parameters include at least one of gain-delay information corresponding to each radio frequency RF channel in the corresponding TRP, delay information from each RF channel to each antenna element, and gain information of each antenna element.

[0274] It should be noted here that the above positioning end provided in the embodiments of the present application can implement all the method steps of the method embodiments with the positioning end as the execution subject, and can achieve the same technical effects. The same parts and beneficial effects as those in the method embodiments will not be specifically described in this embodiment.

[0275] Figure 5 is one of the schematic structural diagrams of the downlink departure angle determination device provided by the present application, as Figure 5 shown, the device includes:

[0276] A data determination unit 510, configured to determine the beamforming parameters and antenna parameters used by the transceiver point TRP to send each downlink positioning reference signal DL-PRS, and the difference parameters of the TRP, where the difference parameters include parameters in which there are differences in amplitude and phase in the transmission paths of the respective antenna elements of the corresponding TRP;

[0277] A data sending unit 520, configured to send the beamforming parameter, the antenna parameter, and the difference parameter to a positioning end, so that the positioning end determines a downlink departure angle based on the beamforming parameter, the antenna parameter, and the difference parameter.

[0278] Optionally, when the network side is a serving base station and the positioning end is a terminal, the data sending unit 520 is configured to:

[0279] Based on at least one of radio resource control (RRC) signaling, media access control control element (MAC-CE) signaling, and downlink control information (DCI) signaling, send the beamforming parameter, the antenna parameter, and the difference parameter to the terminal;

[0280] Or, send the beamforming parameter, the antenna parameter, and the difference parameter to a positioning management function (LMF) unit, and the LMF unit sends the beamforming parameter, the antenna parameter, and the difference parameter to the terminal based on LTE positioning protocol (LPP) signaling.

[0281] Optionally, when the network side is a non-serving base station and the positioning end is a terminal, the data sending unit 520 is configured to:

[0282] Send the beamforming parameter, the antenna parameter, and the difference parameter to the serving base station, and the serving base station forwards the beamforming parameter, the antenna parameter, and the difference parameter to the terminal based on at least one of radio resource control (RRC) signaling, media access control control element (MAC-CE) signaling, and downlink control information (DCI) signaling;

[0283] Or, send the beamforming parameter, the antenna parameter, and the difference parameter to a positioning management function (LMF) unit, and the LMF unit forwards the beamforming parameter, the antenna parameter, and the difference parameter to the terminal based on LTE positioning protocol (LPP) signaling.

[0284] Optionally, when the positioning end is a positioning management function (LMF) unit, the data sending unit 520 is configured to:

[0285] Based on the new radio positioning protocol A, send the beamforming parameter, the antenna parameter, and the difference parameter to the LMF unit.

[0286] Optionally, the difference parameter includes at least one of gain-delay information corresponding to each radio frequency (RF) channel in the corresponding transmit-receive point (TRP), delay information from each RF channel to each antenna element, and gain information of each antenna element.

[0287] Specifically, the above-mentioned downlink departure angle determination device provided by the embodiments of the present application can implement all the method steps implemented by the method embodiments with the network side as the execution entity, and can achieve the same technical effects. Therefore, the same parts and beneficial effects as those in the method embodiments will not be specifically described herein.

[0288] Figure 6 It is the second structural schematic diagram of the downlink departure angle determination device provided by the present application. As Figure 6 shown, the device includes:

[0289] A data receiving unit 610, configured to receive the beamforming parameters and antenna parameters used by each transceiver point (TRP) to send each downlink positioning reference signal (DL-PRS), and the difference parameters of the TRP, where the difference parameters include the parameters indicating differences in amplitude and phase of the emission paths of each antenna oscillator corresponding to the TRP;

[0290] A departure angle determination unit 620, configured to determine the downlink departure angle based on the beamforming parameters, the antenna parameters, and the difference parameters.

[0291] Optionally, the departure angle determination unit 620 includes:

[0292] A first distribution construction subunit, configured to determine the first beam space distribution information of the DL-PRS based on the beamforming parameters and the antenna parameters;

[0293] A difference correction subunit, configured to correct the first beam space distribution information based on the difference parameters to obtain the second beam space distribution information;

[0294] A departure angle determination subunit, configured to determine the downlink departure angle based on the second beam space distribution information.

[0295] Optionally, the first distribution construction subunit is used to:

[0296] Determine a beamforming matrix based on the beamforming parameters;

[0297] Determine an antenna array steering matrix based on the antenna parameters;

[0298] Determine the first beam space distribution information based on the beamforming matrix and the antenna array steering matrix.

[0299] Optionally, the difference correction subunit is used to:

[0300] Construct a correction matrix based on the difference parameters;

[0301] Based on the correction matrix, correct the first beam spatial distribution information to obtain the second beam spatial distribution information.

[0302] Optionally, the departure angle determination subunit is configured to:

[0303] Based on the reference signal received power (RSRP) distribution information of the DL-PRS, correct the second beam spatial distribution information to obtain the third beam spatial distribution information;

[0304] Based on the third beam spatial distribution information, determine the downlink departure angle.

[0305] Optionally, the departure angle determination subunit is configured to:

[0306] Based on the RSRP distribution information and the second beam spatial distribution information, determine the beam residual angle deviation of the second beam spatial distribution information;

[0307] Based on the beam residual angle deviation, correct the second beam spatial distribution information to obtain the third beam spatial distribution information.

[0308] Optionally, when the positioning end is a positioning management function unit (LMF), the departure angle determination subunit is further configured to:

[0309] Receive the reference signal received power (RSRP) and the receiving position of the DL-PRS sent by the reference terminal;

[0310] Based on the RSRP and the receiving position of the DL-PRS, and the antenna position of the TRP corresponding to the DL-PRS, determine the RSRP distribution information.

[0311] Optionally, when the positioning end is a terminal, the departure angle determination subunit is further configured to:

[0312] Receive the reference signal received power (RSRP) and the receiving position of the DL-PRS forwarded by the reference terminal through the positioning management function unit (LMF) or the network side;

[0313] Based on the RSRP and the receiving position of the DL-PRS, and the antenna position of the TRP corresponding to the DL-PRS, determine the RSRP distribution information.

[0314] Optionally, when the positioning end is a positioning management function unit (LMF), the data receiving unit 610 is configured to:

[0315] Based on the New Radio (NR) positioning protocol A, receive the beamforming parameters, the antenna parameters, and the difference parameters sent by the network side.

[0316] Optionally, when the positioning end is a terminal, the data receiving unit 610 is configured to:

[0317] receive the beamforming parameter, the antenna parameter, and the difference parameter sent by the serving base station based on at least one of radio resource control (RRC) signaling, medium access control control element (MAC-CE) signaling, and downlink control information (DCI) signaling, where the beamforming parameter, the antenna parameter, and the difference parameter are determined by the serving base station or sent to the serving base station after being determined by a non-serving base station;

[0318] alternatively, receive the beamforming parameter, the antenna parameter, and the difference parameter forwarded by the location management function (LMF) based on LTE positioning protocol (LPP) signaling, where the beamforming parameter, the antenna parameter, and the difference parameter are sent by a base station to the LMF.

[0319] Optionally, the difference parameter includes at least one of gain-delay information for each radio frequency (RF) channel in the corresponding transmit-receive point (TRP), delay information from each RF channel to each antenna element, and gain information for each antenna element.

[0320] Specifically, the above-mentioned downlink departure angle determination device provided in the embodiments of the present application can implement all the method steps implemented by the method embodiments with the positioning end as the execution subject, and can achieve the same technical effects. Therefore, the same parts and beneficial effects as those in the method embodiments will not be specifically described in this embodiment.

[0321] It should be noted that the division of units / modules in the above embodiments of the present application is illustrative, and is only a logical function division. In actual implementation, there may be other division methods. In addition, in each embodiment of the present application, each functional unit may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above integrated units may be implemented in the form of hardware or in the form of software functional units.

[0322] When the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a processor-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to execute all or part of the steps of the methods described in various embodiments of this application. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs.

[0323] Optionally, an embodiment of this application further provides a processor-readable storage medium. The processor-readable storage medium stores a computer program, and the computer program is used to cause the processor to execute the methods provided in the above-mentioned various embodiments, including:

[0324] Determine the beamforming parameters and antenna parameters used by the transceiver point TRP to send each downlink positioning reference signal DL-PRS, and the difference parameters of the TRP. The difference parameters include the parameters indicating the differences in amplitude and phase of the emission paths of the respective antenna elements corresponding to the TRP;

[0325] Send the beamforming parameters, the antenna parameters, and the difference parameters to the positioning end for the positioning end to determine the downlink departure angle based on the beamforming parameters, the antenna parameters, and the difference parameters;

[0326] Or it includes:

[0327] Receive the beamforming parameters and antenna parameters used by the transceiver point TRP to send each downlink positioning reference signal DL-PRS, and the difference parameters of the TRP. The difference parameters include the parameters indicating the differences in amplitude and phase of the emission paths of the respective antenna elements corresponding to the TRP;

[0328] Determine the downlink departure angle based on the beamforming parameters, the antenna parameters, and the difference parameters.

[0329] It should be noted that: The processor-readable storage medium can be any available medium or data storage device accessible by the processor, including but not limited to magnetic memories (such as floppy disks, hard disks, magnetic tapes, magneto-optical discs (MO), etc.), optical memories (such as CDs, DVDs, BDs, HVDs, etc.), and semiconductor memories (such as ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid state drives (SSD)), etc.

[0330] In addition, it should be noted that: The technical solutions provided in the embodiments of this application can be applicable to multiple systems, especially 5G systems. For example, the applicable systems can be global system of mobile communication (GSM) systems, code division multiple access (CDMA) systems, Wideband Code Division Multiple Access (WCDMA) general packet radio service (GPRS) systems, long term evolution (LTE) systems, LTE frequency division duplex (FDD) systems, LTE time division duplex (TDD) systems, long term evolution advanced (LTE-A) systems, universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) systems, 5G New Radio (NR) systems, etc. Both positioning terminal devices and network devices are included in these multiple systems. The core network part can also be included in the system, such as the Evloved Packet System (EPS), 5G system (5GS), etc.

[0331] The positioning terminal device involved in the embodiments of the present application can be a device that provides voice and / or data connectivity to users, such as a handheld device with wireless connection capabilities, or other processing devices connected to a wireless modem, etc. In different systems, the name of the positioning terminal device may also be different. For example, in a 5G system, the positioning terminal device can be called a User Equipment (UE). The wireless positioning terminal device can communicate with one or more core networks (CNs) via a Radio Access Network (RAN). The wireless positioning terminal device can be a mobile positioning terminal device, such as a mobile phone (or "cellular" phone) and a computer with a mobile positioning terminal device. For example, it can be a portable, pocket-sized, handheld, computer-integrated, or vehicle-mounted mobile device that exchanges voice and / or data with the wireless access network. For example, devices such as Personal Communication Service (PCS) phones, cordless phones, Session Initiated Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistant (PDA), etc. The wireless positioning terminal device can also be called a system, subscriber unit, subscriber station, mobile station, mobile, remote station, access point, remote terminal, access terminal, user terminal, user agent, user device, which is not limited in the embodiments of the present application.

[0332] The network side involved in the embodiments of the present application may be a base station, which may include multiple cells that provide services for the positioning end. Depending on the specific application scenarios, the base station may also be referred to as an access point, or may be a device in the access network that communicates with wireless positioning end devices through one or more sectors over the air interface, or other names. The network side can be used to mutually replace the received air frames with Internet Protocol (IP) packets and act as a router between the wireless positioning end device and the rest of the access network, where the rest of the access network may include an Internet Protocol (IP) communication network. The network side can also coordinate the attribute management of the air interface. For example, the network side involved in the embodiments of the present application may be the network side (Base Transceiver Station, BTS) in the Global System for Mobile communications (GSM) or Code Division Multiple Access (CDMA), may also be the network side (NodeB) in Wide-band Code Division Multiple Access (WCDMA), may also be the evolved network side (evolutional Node B, eNB or e-NodeB) in the Long Term Evolution (LTE) system, the 5G base station (gNB) in the 5G network architecture (next generation system), may also be a Home evolved Node B (HeNB), a relay node, a femto, a pico, etc. The embodiments of the present application do not limit this. In some network architectures, the network side may include a centralized unit (CU) node and a distributed unit (DU) node, and the centralized unit and the distributed unit may also be arranged separately geographically.

[0333] One or more antennas can be used respectively between the network side and the positioning end device for Multi-Input Multi-Output (MIMO) transmission. The MIMO transmission can be Single User MIMO (SU-MIMO) or Multiple User MIMO (MU-MIMO). Depending on the form and quantity of the combined antennas, the MIMO transmission can be 2D-MIMO, 3D-MIMO, FD-MIMO or massive-MIMO, and can also be diversity transmission, precoding transmission, beamforming transmission, etc.

[0334] Those skilled in the art should understand that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memories and optical memories, etc.) that contain computer-usable program code.

[0335] The present application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer-executable instructions. These computer-executable instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0336] These processor-executable instructions can also be stored in a processor-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the processor-readable memory generate a manufactured article including instruction means that implement the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0337] These processor-executable instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0338] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these changes and modifications.

Claims

1. A method for determining the downlink departure angle, characterized in that The method is applied to the network side, and the method includes: Determine the beamforming parameters and antenna parameters used by a transmission and reception point (TRP) to transmit each downlink positioning reference signal (DL-PRS), and the difference parameters of the TRP. The beamforming parameters include the gain and delay added for each antenna element to reach when the transmitted signal passes through the analog beamforming circuit, and the precoding matrix of the codebook index for precoding. The antenna parameters include the position of the antenna element, the shape and size of the antenna element, and the spacing between antenna elements. The difference parameters include the parameters indicating that there are differences in amplitude and phase in the transmission paths of the respective antenna elements corresponding to the TRP. Send the beamforming parameters, the antenna parameters, and the difference parameters to the positioning side for the positioning side to determine the downlink departure angle based on the beamforming parameters, the antenna parameters, and the difference parameters.

2. The method for determining the downlink departure angle according to claim 1, wherein When the network side is the serving base station and the positioning side is the terminal, the sending the beamforming parameters, the antenna parameters, and the difference parameters to the positioning side includes: Based on at least one of radio resource control (RRC) signaling, media access control control element (MAC-CE) signaling, and downlink control information (DCI) signaling, send the beamforming parameters, the antenna parameters, and the difference parameters to the terminal; Or, send the beamforming parameters, the antenna parameters, and the difference parameters to the positioning management function unit (LMF), and the LMF sends the beamforming parameters, the antenna parameters, and the difference parameters to the terminal based on LTE positioning protocol (LPP) signaling.

3. The method for determining the downward departure angle according to claim 1, characterized in that When the network side is a non-serving base station and the positioning side is the terminal, the sending the beamforming parameters, the antenna parameters, and the difference parameters to the positioning side includes: Send the beamforming parameters, the antenna parameters, and the difference parameters to the serving base station, and the serving base station forwards the beamforming parameters, the antenna parameters, and the difference parameters to the terminal based on at least one of radio resource control (RRC) signaling, media access control control element (MAC-CE) signaling, and downlink control information (DCI) signaling; Or, send the beamforming parameters, the antenna parameters, and the difference parameters to the positioning management function unit (LMF), and the LMF forwards the beamforming parameters, the antenna parameters, and the difference parameters to the terminal based on LTE positioning protocol (LPP) signaling.

4. The method for determining the downlink departure angle according to claim 1, wherein When the positioning side is the positioning management function unit (LMF), the sending the beamforming parameters, the antenna parameters, and the difference parameters to the positioning side includes: Based on the new radio positioning protocol A, send the beamforming parameters, the antenna parameters, and the difference parameters to the LMF.

5. The downlink departure angle determination method according to any one of claims 1 to 4, characterized in that The difference parameters include at least one of the gain-delay information of each radio frequency (RF) channel corresponding to the TRP, the delay information from each RF channel to each antenna element, and the gain information of each antenna element.

6. A method for determining the downlink departure angle, characterized in that, The method is applied to the positioning side, and the method includes: Receive the beamforming parameters and antenna parameters used by the transmitting and receiving point TRP to transmit each downlink positioning reference signal DL-PRS, as well as the difference parameters of the TRP. The beamforming parameters include the gain and delay added for each antenna element when the transmitted signal passes through the analog beamforming circuit, and the precoding matrix of the codebook index for precoding. The antenna parameters include the position of the antenna element, the shape and size of the antenna element, and the spacing between antenna elements. The difference parameters include the parameters indicating the differences in amplitude and phase of the transmission paths of the respective antenna elements corresponding to the TRP. Determine the downlink departure angle based on the beamforming parameters, the antenna parameters, and the difference parameters.

7. The method for determining the downlink departure angle according to claim 6, characterized in that, The determining of the downlink departure angle based on the beamforming parameters, the antenna parameters, and the difference parameters includes: Determine the first beam space distribution information of the DL-PRS based on the beamforming parameters and the antenna parameters. Correct the first beam space distribution information based on the difference parameters to obtain the second beam space distribution information. Determine the downlink departure angle based on the second beam space distribution information.

8. The method for determining the downlink departure angle according to claim 7, wherein The determining of the first beam space distribution information of the DL-PRS based on the beamforming parameters and the antenna parameters includes: Determine the beamforming matrix based on the beamforming parameters. Determine the antenna array steering matrix based on the antenna parameters. Determine the first beam space distribution information based on the beamforming matrix and the antenna array steering matrix.

9. The method for determining the downlink departure angle according to claim 7, wherein The correcting of the first beam space distribution information based on the difference parameters to obtain the second beam space distribution information includes: Construct a correction matrix based on the difference parameters. Correct the first beam space distribution information based on the correction matrix to obtain the second beam space distribution information.

10. The method for determining the downlink departure angle according to claim 7, characterized in that, The determining of the downlink departure angle based on the second beam space distribution information includes: Correct the second beam space distribution information based on the reference signal received power RSRP distribution information of the DL-PRS to obtain the third beam space distribution information. Determine the downlink departure angle based on the third beam space distribution information.

11. The method for determining the downlink departure angle according to claim 10, wherein The correcting of the second beam space distribution information based on the reference signal received power RSRP distribution information of the DL-PRS to obtain the third beam space distribution information includes: Determine the beam residual angle deviation of the second beam space distribution information based on the RSRP distribution information and the second beam space distribution information. Correct the second beam space distribution information based on the beam residual angle deviation to obtain the third beam space distribution information.

12. The method for determining the downlink departure angle according to claim 10, wherein When the positioning end is the positioning management function unit LMF, before the correcting of the second beam space distribution information based on the reference signal received power RSRP distribution information of the DL-PRS to obtain the third beam space distribution information, it further includes: Receive the reference signal received power RSRP and the receiving position of the DL-PRS sent by the reference terminal. Determine the RSRP distribution information based on the RSRP and reception location of the DL-PRS, and the antenna location of the TRP corresponding to the DL-PRS.

13. The method for determining the downlink departure angle according to claim 10, wherein When the positioning end is a terminal, before correcting the second beam space distribution information based on the reference signal received power RSRP distribution information of the DL-PRS to obtain the third beam space distribution information, it further includes: Receive the reference signal received power RSRP and reception location of the DL-PRS forwarded by a reference terminal through a positioning management function unit LMF or the network side; Determine the RSRP distribution information based on the RSRP and reception location of the DL-PRS, and the antenna location of the TRP corresponding to the DL-PRS.

14. The downlink departure angle determination method according to any one of claims 6 to 13, characterized in that, When the positioning end is a positioning management function unit LMF, receiving the beamforming parameters, antenna parameters, and the differential parameters of the TRP used for transmitting each downlink positioning reference signal DL-PRS includes: Based on the new radio positioning protocol A, receive the beamforming parameters, antenna parameters, and the differential parameters sent by the network side.

15. The downlink departure angle determination method according to any one of claims 6 to 13, characterized in that, When the positioning end is a terminal, receiving the beamforming parameters, antenna parameters, and the differential parameters of the TRP used for transmitting each downlink positioning reference signal DL-PRS includes: Receive the beamforming parameters, antenna parameters, and the differential parameters sent by the serving base station based on at least one of radio resource control RRC signaling, media access control control element MAC-CE signaling, and downlink control information DCI signaling, where the beamforming parameters, antenna parameters, and the differential parameters are determined by the serving base station or a non-serving base station and then sent to the serving base station; Alternatively, receive the beamforming parameters, antenna parameters, and the differential parameters forwarded by a positioning management function unit LMF based on LTE positioning protocol LPP signaling, where the beamforming parameters, antenna parameters, and the differential parameters are sent by the base station to the LMF.

16. The method for determining the downlink departure angle according to any one of claims 6 to 13, characterized in that, The differential parameters include at least one of the gain-delay information of each radio frequency RF channel in the corresponding TRP, the delay information from each RF channel to each antenna element, and the gain information of each antenna element.

17. A network side, characterized in that, Include a memory, a transceiver, and a processor: The memory is used to store computer programs; the transceiver is used to transmit and receive data under the control of the processor; the processor is used to read the computer programs in the memory and perform the following operations: Determine the beamforming parameters and antenna parameters used by the transceiver point (TRP) to transmit each downlink positioning reference signal (DL-PRS), as well as the differential parameters of the TRP. The beamforming parameters include the gain and delay added for each antenna element when the transmitted signal passes through the analog beamforming circuit, and the precoding matrix of the codebook index for precoding. The antenna parameters include the position of the antenna element, the shape and size of the antenna element, and the spacing between antenna elements. The differential parameters include the parameters indicating the differences in amplitude and phase of the transmission paths of the respective antenna elements corresponding to the TRP. Send the beamforming parameters, the antenna parameters, and the differential parameters to the positioning end for the positioning end to determine the downlink departure angle based on the beamforming parameters, the antenna parameters, and the differential parameters.

18. The network side according to claim 17, wherein When the network side is the serving base station and the positioning end is the terminal, the step of sending the beamforming parameters, the antenna parameters, and the differential parameters to the positioning end includes: Based on at least one of the radio resource control (RRC) signaling, the media access control control element (MAC-CE) signaling, and the downlink control information (DCI) signaling, send the beamforming parameters, the antenna parameters, and the differential parameters to the terminal; Alternatively, send the beamforming parameters, the antenna parameters, and the differential parameters to the positioning management function unit (LMF), and the LMF sends the beamforming parameters, the antenna parameters, and the differential parameters to the terminal based on the LTE positioning protocol (LPP) signaling.

19. The network side according to claim 17, wherein When the network side is a non-serving base station and the positioning end is the terminal, the step of sending the beamforming parameters, the antenna parameters, and the differential parameters to the positioning end includes: Send the beamforming parameters, the antenna parameters, and the differential parameters to the serving base station, and the serving base station forwards the beamforming parameters, the antenna parameters, and the differential parameters to the terminal based on at least one of the radio resource control (RRC) signaling, the media access control control element (MAC-CE) signaling, and the downlink control information (DCI) signaling; Alternatively, send the beamforming parameters, the antenna parameters, and the differential parameters to the positioning management function unit (LMF), and the LMF forwards the beamforming parameters, the antenna parameters, and the differential parameters to the terminal based on the LTE positioning protocol (LPP) signaling.

20. The network side according to claim 17, characterized in that, When the positioning end is the positioning management function unit (LMF), the step of sending the beamforming parameters, the antenna parameters, and the differential parameters to the positioning end includes: Based on the new radio positioning protocol A, send the beamforming parameters, the antenna parameters, and the differential parameters to the LMF.

21. The network side according to any one of claims 17 to 20, characterized in that The differential parameters include at least one of the gain-delay information of each radio frequency (RF) channel corresponding to the TRP, the delay information from each RF channel to each antenna element, and the gain information of each antenna element.

22. A positioning end, characterized in that, Including a memory, a transceiver, and a processor: A memory for storing computer programs; a transceiver for transmitting and receiving data under the control of the processor; a processor for reading the computer programs in the memory and performing the following operations: Receiving beamforming parameters and antenna parameters used by each downlink positioning reference signal (DL-PRS) transmitted by a transceiver point (TRP), and differential parameters of the TRP, where the beamforming parameters include the gain and delay added for each antenna element when the transmitted signal passes through the analog beamforming circuit, and a precoding matrix of a codebook index for precoding, the antenna parameters include the positions, shapes, and sizes of the antenna elements, and the spacing between the antenna elements, and the differential parameters include parameters indicating differences in amplitude and phase of the transmission paths of the respective antenna elements of the corresponding TRP; Determining a downlink departure angle based on the beamforming parameters, the antenna parameters, and the differential parameters.

23. The positioning end according to claim 22, characterized in that, The determining of the downlink departure angle based on the beamforming parameters, the antenna parameters, and the differential parameters includes: Determining first beamspace distribution information of the DL-PRS based on the beamforming parameters and the antenna parameters; Correcting the first beamspace distribution information based on the differential parameters to obtain second beamspace distribution information; Determining the downlink departure angle based on the second beamspace distribution information.

24. The positioning end according to claim 23, wherein The determining of the first beamspace distribution information of the DL-PRS based on the beamforming parameters and the antenna parameters includes: Determining a beamforming matrix based on the beamforming parameters; Determining an antenna array steering matrix based on the antenna parameters; Determining the first beamspace distribution information based on the beamforming matrix and the antenna array steering matrix.

25. The positioning end according to claim 23, characterized in that, The correcting of the first beamspace distribution information based on the differential parameters to obtain second beamspace distribution information includes: Constructing a correction matrix based on the differential parameters; Correcting the first beamspace distribution information based on the correction matrix to obtain second beamspace distribution information.

26. The positioning end according to claim 23, characterized in that, The determining of the downlink departure angle based on the second beamspace distribution information includes: Correcting the second beamspace distribution information based on the reference signal received power (RSRP) distribution information of the DL-PRS to obtain third beamspace distribution information; Determining the downlink departure angle based on the third beamspace distribution information.

27. The positioning end according to claim 26, wherein The correcting of the second beamspace distribution information based on the RSRP distribution information of the DL-PRS to obtain third beamspace distribution information includes: Determining a beam residual angle deviation of the second beamspace distribution information based on the RSRP distribution information and the second beamspace distribution information; Correcting the second beamspace distribution information based on the beam residual angle deviation to obtain the third beamspace distribution information.

28. The positioning end according to claim 26, wherein When the positioning end is a positioning management function unit (LMF), before the correcting of the second beamspace distribution information based on the RSRP distribution information of the DL-PRS to obtain third beamspace distribution information, it further includes: Receive the reference signal receiving power (RSRP) and receiving location of the DL-PRS sent by the reference terminal; Determine the RSRP distribution information based on the RSRP and receiving location of the DL-PRS, and the antenna location of the TRP corresponding to the DL-PRS.

29. The positioning end according to claim 26, wherein When the positioning end is a terminal, before correcting the second beam spatial distribution information based on the RSRP distribution information of the DL-PRS to obtain the third beam spatial distribution information, it further includes: Receive the RSRP and receiving location of the DL-PRS forwarded by the reference terminal through the positioning management function unit (LMF) or the network side; Determine the RSRP distribution information based on the RSRP and receiving location of the DL-PRS, and the antenna location of the TRP corresponding to the DL-PRS.

30. The positioning end according to any one of claims 22 to 29, characterized in that, When the positioning end is the positioning management function unit (LMF), receiving the beamforming parameters, antenna parameters, and differential parameters used by each transceiver point (TRP) to send each downlink positioning reference signal (DL-PRS) includes: Based on the new radio positioning protocol A, receive the beamforming parameters, antenna parameters, and differential parameters sent by the network side.

31. The positioning end according to any one of claims 22 to 29, characterized in that, When the positioning end is a terminal, receiving the beamforming parameters, antenna parameters, and differential parameters used by each transceiver point (TRP) to send each downlink positioning reference signal (DL-PRS) includes: Receive the beamforming parameters, antenna parameters, and differential parameters sent by the serving base station based on at least one of radio resource control (RRC) signaling, media access control control element (MAC-CE) signaling, and downlink control information (DCI) signaling, where the beamforming parameters, antenna parameters, and differential parameters are determined by the serving base station or a non-serving base station and then sent to the serving base station; Or, receive the beamforming parameters, antenna parameters, and differential parameters forwarded by the positioning management function unit (LMF) based on LTE positioning protocol (LPP) signaling, where the beamforming parameters, antenna parameters, and differential parameters are sent by the base station to the LMF.

32. The positioning end according to any one of claims 22 to 29, characterized in that, The differential parameters include at least one of the gain-delay information of each radio frequency (RF) channel in the corresponding TRP, the delay information from each RF channel to each antenna element, and the gain information of each antenna element.

33. A downlink departure angle determination device, characterized in that, It includes: A data determination unit for determining the beamforming parameters, antenna parameters, and differential parameters used by each transceiver point (TRP) to send each downlink positioning reference signal (DL-PRS). The beamforming parameters include the gain and delay added for each antenna element when the transmitted signal passes through the analog beamforming circuit, and the precoding matrix of the codebook index for precoding. The antenna parameters include the location, shape, size, and spacing of the antenna elements. The differential parameters include the parameters with differences in amplitude and phase in the transmission paths of each antenna element of the corresponding TRP; A data sending unit, configured to send the beamforming parameter, the antenna parameter, and the difference parameter to a positioning end, so that the positioning end determines a downlink departure angle based on the beamforming parameter, the antenna parameter, and the difference parameter.

34. A downlink departure angle determination device, characterized in that It includes: A data receiving unit, configured to receive the beamforming parameter and the antenna parameter used by a transceiver point (TRP) to send each downlink positioning reference signal (DL-PRS), and the difference parameter of the TRP. The beamforming parameter includes the gain and delay added to each antenna element when the transmitted signal passes through the analog beamforming circuit, and the precoding matrix of the codebook index for precoding. The antenna parameter includes the position of the antenna element, the shape and size of the antenna element, and the spacing between antenna elements. The difference parameter includes the parameters in which there are differences in amplitude and phase in the transmission paths of the respective antenna elements corresponding to the TRP; A departure angle determining unit, configured to determine a downlink departure angle based on the beamforming parameter, the antenna parameter, and the difference parameter.

35. A processor-readable storage medium, characterized in that, The processor-readable storage medium stores a computer program, and the computer program is used to cause the processor to execute the method according to any one of claims 1 to 16.

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