A base station positioning service enhancement method based on inter-node close proximity communication awareness

Abstract

The application discloses a base station positioning service enhancement method based on inter-node close-range communication sensing, and specifically comprises the following steps: deploying a sensing device at the edge area of the coverage range of a base station, and pre-aligning the measurement coordinate system of the base station and the sensing device; accessing the sensing device to the base station to provide preliminary positioning service and acquire preliminary positioning parameters; a positioning target reports a positioning enhancement request according to the position relationship with the base station; after receiving the positioning enhancement request, the base station switches the corresponding enhancement mode, and cooperates the preliminary positioning result and the communication sensing task to the sensing device of the positioning target; the sensing device acquires the accurate positioning parameters between the sensing device and the positioning target; the sensing device reports the accurate positioning parameters of close-range communication sensing, and the base station or the sensing device completes positioning calculation and outputs the enhanced positioning parameters. The application can realize the accuracy improvement and range expansion of the base station positioning service, and has the advantages of good stability, strong adaptability and free deployment.

Description

Technical Field

[0001] This invention pertains to the field of remote sensing detection and identification technology, specifically relating to a method for enhancing base station positioning services based on short-range communication sensing between nodes. Background Technology

[0002] With the development of B5G / 6G technologies, high-precision positioning has become a core requirement in vertical fields such as industrial automation and vehicle-to-everything (V2X) communication. Existing 5G cellular networks rely on single-site base station measurement (e.g., RTT, AOA) positioning technologies, which are limited by non-line-of-sight propagation, multipath effects, and hardware resolution, achieving only meter- or decimeter-level accuracy, which is insufficient for centimeter-level scenarios. While Integrated Communication and Sensing (ISAC) can combine communication and sensing functions to improve positioning performance, it requires large-scale modifications to base station hardware (e.g., adding radar modules), resulting in high deployment costs and incompatibility with existing network architectures. Furthermore, traditional solutions rely on base station coverage, failing to provide service in blind spots (e.g., tunnels, indoors) or extreme environments, while relay technologies lack collaborative sensing mechanisms, making it difficult to guarantee positioning continuity. Although the 3GPP Rel-18 standard proposes enhancing terminal collaboration capabilities through Sidelink technology, its positioning accuracy and coverage expansion are still limited by resource allocation efficiency and environmental dynamics. Existing technologies such as Smart Metasurfaces (RIS) can optimize signal propagation, but their fixed deployment mode limits flexibility and scalability. Therefore, how to achieve high-precision wide-area positioning through low-cost, dynamically deployable edge nodes under the existing network architecture has become a technical challenge that B5G / 6G networks urgently need to solve. Summary of the Invention

[0003] The purpose of this invention is to provide a method for enhancing base station positioning services based on short-range communication sensing between nodes. This invention can improve the accuracy and expand the range of base station positioning services, and features good stability, strong adaptability, and flexible deployment.

[0004] The technical solution of this invention: A method for enhancing base station positioning services based on inter-node short-range communication sensing, specifically including the following steps:

[0005] Step 1: Deploy sensing devices in the edge area of ​​the base station's coverage area, and pre-align the measurement coordinate systems of the base station and the sensing devices;

[0006] Step 2: Connect the sensing device to the base station, and the base station will provide preliminary positioning services for the sensing device to obtain the preliminary positioning parameters of the base station and the sensing device;

[0007] Step 3: The target location reports a location enhancement request based on its location relationship with the base station;

[0008] Step 4: After receiving the positioning enhancement request, the base station switches to the corresponding enhancement mode to respond to the request, and coordinates the preliminary positioning results with the communication sensing task to the sensing device of the positioning target;

[0009] Step 5: The sensing device acquires precise positioning parameters between the sensing device and the positioning target through near-field communication sensing technology;

[0010] Step 6: The sensing device reports the accurate positioning parameters of the near-field communication sensing, and the base station or sensing device completes the positioning calculation and outputs the enhanced positioning parameters.

[0011] In the aforementioned base station positioning service enhancement method based on inter-node short-range communication sensing, in step 1, the alignment operation of the measurement coordinate system is to keep the coordinate axes of the base station and the sensing device in a positive parallel direction.

[0012] In the aforementioned base station positioning service enhancement method based on inter-node short-range communication sensing, step 2 specifically involves the base station measuring the downlink signal reception-transmission time difference and the signal arrival angle, then measuring the uplink signal reception-transmission time difference of the positioning target, calculating the round-trip time based on the downlink signal reception-transmission time difference and the uplink signal reception-transmission time difference, calculating the distance using the round-trip time, and combining the signal arrival angle to complete the preliminary positioning.

[0013] In the aforementioned base station positioning service enhancement method based on inter-node short-range communication sensing, the round-trip time (RTT) is calculated using the following formula:

[0014] RTT=T UERx-Tx +T gNB Rx-Tx =(t1-t0)+(t3-t2)=(t3-t0)-(t2-t1);

[0015] In the formula, T UE Rx-Tx T represents the time difference between receiving and transmitting data to locate the target. gNB Rx-Tx t0 represents the time difference between base station reception and transmission, t1 represents the absolute start time of base station transmission of downlink signal, t2 represents the absolute end time of target reception of downlink signal, t3 represents the absolute start time of target reception of uplink signal, and t3 represents the absolute end time of base station reception of uplink signal.

[0016] In the aforementioned base station positioning service enhancement method based on inter-node short-range communication sensing, the distance d UE The calculation formula is as follows:

[0017]

[0018] Where RTT represents round-trip time and c represents the speed of light.

[0019] In the aforementioned base station positioning service enhancement method based on inter-node short-range communication sensing, the preliminary positioning formula is as follows:

[0020]

[0021] Where, d UE θ represents the distance between the target and the base station. UE This represents the azimuth angle of the target relative to the base station, i.e., the signal arrival angle; (x BS y BS (x) represents the base station coordinates. UE y UE ) represents the calculated coordinates of the target.

[0022] In the aforementioned base station positioning service enhancement method based on inter-node short-range communication sensing, step 4, the enhancement mode includes:

[0023] Enhanced Mode 1: When the target is within the coverage area of ​​the base station, it communicates directly with the base station to obtain the preliminary positioning service of the base station, directly reports the positioning enhancement request, and calculates the accurate positioning parameters through near-field communication sensing technology;

[0024] Enhanced Mode 2: When the target is outside the coverage area of ​​the base station or there is a line-of-sight obstacle, the target cannot obtain the initial positioning service of the base station. It indirectly reports the positioning enhancement request through the sensing device as a relay. The precise target location outside the positioning service range is calculated through near-field communication sensing technology, thereby expanding the positioning service range.

[0025] In the aforementioned base station positioning service enhancement method based on inter-node short-range communication sensing, enhancement mode 1 includes enhancement mode 1.1 and enhancement mode 1.2;

[0026] Mode 1.1 specifically refers to enhancing the azimuth measurement results of the preliminary positioning service when facing long-distance positioning and low base station angular resolution. The calculation formula is as follows:

[0027]

[0028] θ′ s =π-(α) S –θ)-α B ;

[0029] θ′ T =π-(α) S -θ);

[0030] In the formula, d S d represents the initial distance between the sensing device and the base station.T Let θ represent the initial distance between the target and the base station, θ represent the azimuth angle of the target relative to the sensing device, d represent the distance between the target and the sensing device, and α represent the distance between the target and the sensing device. B α represents the vertex angle of the base station. S θ′ represents the angle on the sensing device side. s θ′ represents the precise azimuth angle of the sensing device relative to the base station. T This indicates the precise azimuth angle of the target relative to the base station;

[0031] The enhanced mode 1.2 specifically enhances the distance measurement results of the positioning service when facing severe multipath interference and significant clock synchronization errors. The calculation formula is as follows:

[0032] α B =θ S -θ T ;

[0033] α S =(π-θ) S )+θ;

[0034] α T =θ T +θ;

[0035]

[0036] In the formula, θ S θ represents the initial azimuth angle of the sensing device relative to the base station. T θ represents the initial azimuth angle of the target relative to the base station, d represents the azimuth angle of the target relative to the sensing device, and α represents the distance of the target relative to the sensing device. B α represents the vertex angle of the base station. S Indicates the angle on the sensing device side, d′ s d′ represents the precise distance between the sensing device and the base station. T This indicates the precise distance between the target and the base station.

[0037] In the aforementioned base station positioning service enhancement method based on inter-node short-range communication sensing, in enhancement mode 1, all measurement results are reported to the location management function, which processes them and issues the final positioning result.

[0038] In the aforementioned base station positioning service enhancement method based on inter-node short-range communication sensing, enhancement mode 2 specifically expands the positioning service range when the base station cannot directly perform positioning. The calculation formula is as follows:

[0039] α S =(π-θ) S )+θ;

[0040]

[0041]

[0042] θ′ s =θ S -α B ;

[0043] In the formula, α S θ represents the angle on the side of the sensing device, and θ represents the azimuth angle of the positioning target relative to the sensing device. S d′ represents the initial azimuth angle of the sensing device relative to the base station. T d represents the precise distance between the target and the base station, and d represents the distance between the target and the sensing device. S α represents the initial distance between the sensing device and the base station. B d represents the vertex angle of the base station. T θ′ represents the initial distance between the target and the base station. s This indicates the precise azimuth angle of the sensing device relative to the base station.

[0044] In the aforementioned base station positioning service enhancement method based on inter-node short-range communication sensing, in enhancement mode 2, the sensing device autonomously calculates positioning information based on the short-range communication sensing measurement results and the positioning information of the location management function, and reports the final positioning result to the location management function.

[0045] In the aforementioned base station positioning service enhancement method based on inter-node short-range communication sensing, in step 5, the short-range communication sensing technology uses integrated communication sensing to obtain accurate positioning parameters between the sensing device and the positioning target.

[0046] Compared with the prior art, the present invention has the following beneficial effects:

[0047] This invention enhances base station positioning services by deploying sensing devices at the edge of the base station coverage area, leveraging the short-range communication sensing capabilities of these devices. Furthermore, in terms of communication, this invention acts as a communication relay, utilizing end-to-end communication capabilities to carry edge communication services and improve the communication performance of the base station system. In terms of sensing, this invention acts as a sensing node, utilizing the advantages of good line-of-sight paths and stable propagation channels between nearby nodes to obtain accurate sensing results, thereby improving positioning service accuracy or expanding the positioning service range.

[0048] This invention Attached Figure Description

[0049] Figure 1 This is a schematic diagram illustrating the process of enhancing the base station positioning service of the present invention;

[0050] Figure 2 This is a schematic diagram of the signaling interaction for the single-site positioning service of the base station of the present invention;

[0051] Figure 3 This is a schematic diagram of the signaling interaction of the target location accessing the network via a communication relay according to the present invention;

[0052] Figure 4 This is a schematic diagram illustrating the scenario of the enhanced mode calculation principle of the present invention. Detailed Implementation

[0053] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0054] Example 1: A method for enhancing base station positioning services based on inter-node short-range communication sensing, such as... Figure 1 Specifically, it includes the following steps:

[0055] Step 1: Deploy sensing devices in the edge area of ​​the base station coverage area, and pre-align the measurement coordinate systems of the base station and the sensing devices. In Step 1, the alignment operation of the measurement coordinate systems involves keeping the coordinate axes of the base station and the sensing devices parallel in the positive direction, ensuring that the measurement results of the local coordinate system can be directly used for calculation in the base station coordinate system. Sensing devices include user terminal devices (such as 5G / 6G mobile phones, tablets, and AR / VR devices that support Sidelink communication) and industrial IoT terminals (AGV automated guided vehicles, robotic arms, etc. in factory automation scenarios).

[0056] Step 2: Connect the sensing device to the base station, and the base station provides preliminary positioning services for the sensing device to obtain preliminary positioning parameters between the base station and the sensing device; the preliminary positioning service includes uplink and downlink measurement processes, such as... Figure 2 As shown, the specific steps include the following:

[0057] Step 2.1: The Location Management Function (LMF) determines the positioning capabilities (UE Positioning Capability) and measurement types supported by the user (sensing device, positioning target, etc.) and the downlink positioning reference signal (DL-PRS) capability of the base station. The Location Management Function is a key network element in the 5G core network (5GC), responsible for providing positioning services to user equipment (UE) and supporting high-precision positioning calculation, resource scheduling, and multi-source data fusion.

[0058] In this embodiment, the positioning target refers to the terminal device or object whose location needs to be determined, including but not limited to smartphones, vehicle-to-everything (V2X) terminals, industrial robots, unmanned aerial vehicles (UAVs), wearable devices (AR / VR), and other mobile or fixed objects that need to be located.

[0059] Step 2.2: The location management function sends an Uplink Sounding Reference Signal (UL-SRS) configuration request to the base station; the base station determines the Sounding Reference Signal (SRS) resources and sends the SRS parameters to the user through RRC Reconfiguration information; after the user completes the configuration, the user reports the RRC reconfiguration completion information to the base station; the base station reports confirmation of the SRS configuration information to the location management function; RRC reconfiguration is a core signaling procedure in mobile communication networks, used to dynamically adjust the connection parameters between the user (UE) and the network to optimize communication performance, support mobility management, or adapt to changes in the network environment.

[0060] Step 2.3: The location management function sends downlink positioning reference signal configuration information to the base station; the location management function sends assistance data to the user, including the configuration of the downlink positioning reference signal and the measurement gap of the downlink positioning reference signal.

[0061] Step 2.4: The location management function sends a probe reference signal activation command to the base station; the base station sends a downlink probe reference signal to the user, and the user measures the time difference between the reception and transmission (UE Rx-Tx) of the user equipment; the user sends an uplink probe reference signal to the base station, and the base station measures the time difference between the reception and transmission (gNB Rx-Tx) of the base station and the angle of arrival (AOA).

[0062] Step 2.5: The base station and the user report the measurement results to the location management function; the location management function receives the measurement results from the base station and the user, calculates the user's location, and completes the preliminary positioning service;

[0063] The formula for calculating the round-trip time (RTT) is as follows:

[0064] RTT=T UE Rx-Tx +T gNB Rx-Tx =(t1-t0)+(t3-t2)=(t3-t0)-(t2-t1);

[0065] In the formula, T UE Rx-TxT represents the time difference between receiving and transmitting data from a user equipment. gNB Rx-Tx Let t0 represent the absolute start time of the base station transmitting downlink signals, t1 represent the absolute end time of the user equipment receiving downlink signals, t2 represent the absolute start time of the user equipment transmitting uplink signals, and t3 represent the absolute end time of the base station receiving uplink signals. In this process, t0 and t3, and t1 and t2, are the time differences between the base station and the user's time systems on the same end, respectively. Therefore, perfect synchronization between the base station and the user is not required during RTT measurement.

[0066] The distance d of the user relative to the base station UE The calculation formula is as follows:

[0067]

[0068] Where RTT represents round-trip time and c represents the speed of light.

[0069] The formula for calculating the user's location by combining positioning parameters is as follows:

[0070]

[0071] Where, d UE θ represents the distance between the user and the base station. UE This represents the user's azimuth angle relative to the base station, i.e., the signal arrival angle; (x BS y BS (x) represents the base station coordinates. UE y UE () represents the user coordinates obtained from the positioning calculation.

[0072] The preliminary positioning service result calculated using the above formula is the azimuth angle θ of the sensing device relative to the base station. S The initial distance d between the sensing device and the base station S The azimuth angle θ of the target relative to the base station T and the initial distance d between the target and the base station T .

[0073] Step 3: Report a location enhancement request based on the location relationship between the target and the base station;

[0074] Step 4: After receiving the positioning enhancement request, the base station switches to the corresponding enhancement mode to respond to the request, and coordinates the preliminary positioning results with the communication sensing task to the sensing device of the positioning target; the enhancement modes include: enhancement mode 1 and enhancement mode 2.

[0075] Enhanced Mode 1: Used to improve the accuracy of positioning services. When the positioning target is within the coverage area of ​​the base station, it communicates directly with the base station to obtain the preliminary positioning service of the base station, directly reports the positioning enhancement request, and calculates the accurate positioning parameters through near-field communication sensing technology; Enhanced Mode 1 includes Enhanced Mode 1.1 and Enhanced Mode 1.2;

[0076] Mode 1.1 is used to simultaneously improve the accuracy of azimuth parameters. Specifically, when facing long-distance positioning and low base station angular resolution, this mode can enhance the azimuth measurement results of the initial positioning service. The calculation formula is as follows:

[0077]

[0078] θ′ s =π-(α) S –θ)-α B ;

[0079] θ′ T =π-(α) S -θ);

[0080] In the formula, d S d represents the initial distance between the sensing device and the base station. T Let θ represent the initial distance between the target and the base station, θ represent the azimuth angle of the target relative to the sensing device, d represent the distance between the target and the sensing device, and α represent the distance between the target and the sensing device. B α represents the vertex angle of the base station. S θ′ represents the angle on the sensing device side. s θ′ represents the precise azimuth angle of the sensing device relative to the base station. T This indicates the precise azimuth angle of the target relative to the base station.

[0081] Enhancement mode 1.2 is used to synchronously improve the accuracy of distance parameters. Specifically, when faced with severe multipath interference and significant clock synchronization errors, applying this mode can enhance the distance measurement results of the positioning service. The calculation formula is as follows:

[0082] α B =θ S -θ T ;

[0083] α S =(π-θ) S )+θ;

[0084] α T =θ T +θ;

[0085]

[0086] In the formula, θS θ represents the initial azimuth angle of the sensing device relative to the base station. T θ represents the initial azimuth angle of the target relative to the base station, d represents the azimuth angle of the target relative to the sensing device, and α represents the distance of the target relative to the sensing device. B α represents the vertex angle of the base station. S Indicates the angle on the sensing device side, d′ s d′ represents the precise distance between the sensing device and the base station. T This indicates the precise distance between the target and the base station.

[0087] Enhanced Mode 2: Used to extend the location service range. When the target is outside the base station coverage area or there are obstacles in the line of sight (LOS) route, the target cannot obtain the initial location service from the base station. In this embodiment, the location enhancement request is indirectly reported through Sidelink via a sensing device as a relay, and the precise target location outside the location service range is calculated through near-field communication sensing technology.

[0088] The enhanced mode 2 specifically extends the location service range when the base station cannot directly locate the location. The calculation formula is as follows:

[0089] α S =(π-θ) S )+θ;

[0090]

[0091] θ′ s =θ S -α B ;

[0092] In the formula, α S θ represents the angle on the side of the sensing device, and θ represents the azimuth angle of the positioning target relative to the sensing device. S d′ represents the initial azimuth angle of the sensing device relative to the base station. T d represents the precise distance between the target and the base station, and d represents the distance between the target and the sensing device. S α represents the initial distance between the sensing device and the base station. B d represents the vertex angle of the base station. T θ′ represents the initial distance between the target and the base station. s This indicates the precise azimuth angle of the sensing device relative to the base station.

[0093] In this embodiment, if the target is within the base station's coverage area, the base station provides preliminary positioning services for the target in Enhancement Mode 1. If the target is outside the base station's coverage area, in Enhancement Mode 2, the base station cannot provide preliminary positioning services and needs to report a positioning enhancement request via Sidelink through the sensing device. After the sensing device completes resource configuration, it continues to perform positioning measurements and calculations. Sidelink is a device-to-device direct communication technology defined in the 3GPP standard, allowing users to exchange data directly without the need for base station relay. Figure 3 As shown, the process of locating a target and connecting it to the 5G core network via a sensing device as a relay includes the following steps:

[0094] Step 4.1: The target and the sensing device realize the discovery and access process of Sidelink through the Proximity Service (ProSe); the sensing device periodically broadcasts discovery signals through the Sidelink Discovery Channel (SL-DCH), including information such as Sidelink Identity (SLI) and available services; the target continuously scans and listens for discovery signals, and completes identity verification and authorization according to SLI to achieve two-way authentication and secure association;

[0095] Step 4.2: The positioning device reports a communication request to the communication relay; the communication device reports a Sidelink user initialization request to the base station; after the base station registers the SLI of the positioning target, it sends RRC reconfiguration information to the sensing device; the sensing device sends communication confirmation information to the positioning target.

[0096] Step 4.3: The positioning target establishes an RRC connection with the base station via a sensing device acting as a relay; the base station initializes the context settings of the positioning target; the base station sends Uu interface bearer configuration information to the base station to complete the Uu interface configuration; the base station sends RRC reconfiguration information to the positioning target; the positioning device and communication device complete the PC5 interface bearer configuration; the Uu interface is the wireless air interface between the user and the base station, and the bearer configuration is the core process for establishing and managing the data transmission channel on this interface, which directly affects the communication quality, rate and reliability.

[0097] Step 4.4: Align the Quality of Service (QoS) information between the PC5 bearer of the positioning target and the sensing device with the Uu bearer of the sensing device and the base station; the sensing device, acting as a relay, forwards the packets of the positioning target to the base station, realizing the inter-station reporting process of the positioning enhancement request.

[0098] Step 5: The sensing device acquires precise positioning parameters between itself and the target using near-field communication sensing technology. These parameters include the distance *d* between the target and the sensing device, and the azimuth angle *θ* between the target and the sensing device. The near-field communication sensing technology can be of the following types:

[0099] 1. Traditional radar: It measures information such as distance, speed and angle by emitting electromagnetic waves and receiving the reflected signals from the target, and uses signal delay and Doppler frequency shift. It has a highly mature technological foundation, but it increases the hardware complexity of the sensing equipment and has high requirements for signal processing capabilities.

[0100] 2. Sidelink measurement: It adopts the 5G NR base station positioning protocol and completes relative positioning by receiving and measuring reference signals. It has high accuracy, but it needs to ensure communication quality and is easily affected by interference from complex channel environments.

[0101] 3. Integrated Communication and Sensing: Utilizing the characteristics of 5G NR, waveform design is carried out by combining communication and sensing. Specific sensing signals are transmitted and reflected signals are received to measure information such as distance and angle. High-precision positioning can be achieved with low overhead, but it requires the installation of related antenna arrays and other support.

[0102] Preferably, in this embodiment, communication sensing integration is used for short-range communication measurement.

[0103] Step 6: The sensing device reports the accurate positioning parameters of the near-field communication sensing, performs positioning target calculation, and outputs the enhanced positioning parameters.

[0104] In this example, the calculation method for this step is divided into the following types:

[0105] Type 1, Network Side: All measurement results are reported to the location management function, which processes them and issues the final positioning results, i.e., the computing power is provided by the 5G NR network;

[0106] Type 2, User side: The sensing device autonomously calculates the positioning information based on the short-range communication sensing measurement results and the positioning information of the location management function, and reports the final positioning result to the location management function, that is, the computing power is provided by the edge intelligent node;

[0107] In this process, as a preferred option, Enhancement Mode 1 uses Type 1, and Enhancement Mode 2 uses Type 2 for positioning calculation.

[0108] If the target is outside the base station's coverage area at this time, such as Figure 4 As shown, enhanced mode 2 is adopted and the distance and azimuth parameters of the positioning target are calculated to obtain complete coordinate information and expand the positioning range of the base station.

[0109] In this embodiment, the positioning target gradually approaches the base station. Once it enters the coverage area of ​​the base station, the positioning target synchronously accesses the base station and re-executes steps 3-6 of the present invention. The enhanced mode is switched to mode 1. The specific principle can be switched to mode 1.1 or mode 1.2 according to actual needs to calculate more accurate azimuth or distance parameters and improve the positioning accuracy of the base station.

[0110] This invention makes innovative adjustments with minimal modification cost while retaining the existing architecture, making it reasonable and feasible; it comprehensively considers various positional relationships to design enhancement modes, making it stable and adaptable; unlike fixed infrastructure such as smart metasurfaces, the sensing device can be freely deployed according to complex environments, making it simple and flexible.

[0111] In summary, this invention enhances base station positioning services by deploying sensing devices at the edge of the base station coverage area and leveraging the short-range communication sensing capabilities of these devices: In terms of communication, they act as communication relays, utilizing end-to-end communication capabilities to carry edge communication services and improve the communication performance of the base station system; in terms of sensing, they act as sensing nodes, utilizing advantages such as good line-of-sight paths and stable propagation channels between nearby nodes to obtain accurate sensing results, thereby improving the accuracy of positioning services or expanding the range of positioning services.

Claims

1. A method for enhancing base station positioning services based on inter-node short-range communication sensing, characterized in that, Specifically, the following steps are included: Step 1: Deploy sensing devices in the edge area of ​​the base station's coverage area, and pre-align the measurement coordinate systems of the base station and the sensing devices; Step 2: Connect the sensing device to the base station, and the base station will provide preliminary positioning services for the sensing device to obtain the preliminary positioning parameters of the base station and the sensing device; Step 3: The target location reports a location enhancement request based on its location relationship with the base station; Step 4: After receiving the positioning enhancement request, the base station switches to the corresponding enhancement mode to respond to the request, and coordinates the preliminary positioning results with the communication sensing task to the sensing device of the positioning target; Step 5: The sensing device acquires precise positioning parameters between the sensing device and the positioning target through near-field communication sensing technology; Step 6: The sensing device reports the accurate positioning parameters of the near-field communication sensing, and the base station or sensing device completes the positioning calculation and outputs the enhanced positioning parameters; In step 4, the enhancement mode includes: Enhanced Mode 1: When the target is within the coverage area of ​​the base station, it communicates directly with the base station to obtain the preliminary positioning service of the base station, directly reports the positioning enhancement request, and calculates the accurate positioning parameters through near-field communication sensing technology; Enhanced Mode 2: When the target is outside the coverage area of ​​the base station or there is a line-of-sight obstacle, the target cannot obtain the initial positioning service of the base station. It indirectly reports the positioning enhancement request through the sensing device as a relay. The precise target location outside the positioning service range is calculated through near-field communication sensing technology, thereby expanding the positioning service range. In step 5, the near-field communication sensing technology uses integrated communication and sensing to obtain precise positioning parameters between the sensing device and the positioning target.

2. The base station positioning service enhancement method based on inter-node short-range communication sensing according to claim 1, characterized in that: In step 1, the alignment operation of the measurement coordinate system is to keep the coordinate axes of the base station and the sensing device in a positive parallel direction.

3. The base station positioning service enhancement method based on inter-node short-range communication sensing according to claim 1, characterized in that: In step 2, the preliminary positioning service specifically involves the base station measuring the downlink signal reception-transmission time difference and the signal arrival angle, then measuring the uplink signal reception-transmission time difference of the positioning target, calculating the round-trip time based on the downlink and uplink signal reception-transmission time differences, calculating the distance using the round-trip time, and combining the signal arrival angle to complete the preliminary positioning.

4. The base station positioning service enhancement method based on inter-node short-range communication sensing according to claim 3, characterized in that: round trip time The calculation formula is as follows: ； In the formula, This indicates the time difference between receiving and transmitting data at the target location. Indicates the time difference between base station reception and transmission. This indicates the absolute starting time point for the base station to transmit downlink signals. This indicates the absolute time point at which the target began receiving downlink signals. This indicates the absolute starting time point at which the target sends uplink signals. This is the absolute time point at which the base station finishes receiving uplink signals.

5. The base station positioning service enhancement method based on inter-node short-range communication sensing according to claim 4, characterized in that: The distance The calculation formula is as follows: ； in, Indicates round-trip time. It represents the speed of light.

6. The base station positioning service enhancement method based on inter-node short-range communication sensing according to claim 5, characterized in that: The formula for preliminary positioning is as follows: ； in, This indicates the distance of the target location relative to the base station. This indicates the azimuth angle of the target relative to the base station, i.e., the angle of arrival of the signal; Indicates the base station coordinates. The coordinates of the target obtained from the calculation.

7. The base station positioning service enhancement method based on inter-node short-range communication sensing according to claim 1, characterized in that: The enhancement mode 1 includes enhancement mode 1.1 and enhancement mode 1.2; Mode 1.1 specifically refers to enhancing the azimuth measurement results of the preliminary positioning service when facing long-distance positioning and low base station angular resolution. The calculation formula is as follows: ； ； ； ； In the formula, This indicates the initial distance between the sensing device and the base station. This indicates the initial distance between the target and the base station. This indicates the azimuth angle of the target relative to the sensing device. This indicates the distance between the target and the sensing device. Indicates the vertex angle of the base station. Indicates the angle on the sensing device side. This indicates the precise azimuth angle of the sensing device relative to the base station. This indicates the precise azimuth angle of the target relative to the base station; The enhanced mode 1.2 specifically enhances the distance measurement results of the positioning service when facing severe multipath interference and significant clock synchronization errors. The calculation formula is as follows: ； ； ； ； ； In the formula, This indicates the initial azimuth angle of the sensing device relative to the base station. This indicates the initial azimuth angle of the target relative to the base station. This indicates the azimuth angle of the target relative to the sensing device. This indicates the distance between the target and the sensing device. Indicates the vertex angle of the base station. Indicates the angle on the sensing device side. This indicates the precise distance between the sensing device and the base station. This indicates the precise distance between the target and the base station.

8. The base station positioning service enhancement method based on inter-node short-range communication sensing according to claim 7, characterized in that: In the enhanced mode 1, all measurement results are reported to the location management function, which processes them and issues the final positioning result.

9. The base station positioning service enhancement method based on inter-node short-range communication sensing according to claim 1, characterized in that: The enhanced mode 2 specifically extends the location service range when the base station cannot directly locate the location. The calculation formula is as follows: ； ； ； ； In the formula, Indicates the angle on the sensing device side. This indicates the azimuth angle of the target relative to the sensing device. This indicates the initial azimuth angle of the sensing device relative to the base station. This indicates the precise distance between the target and the base station. This indicates the distance between the target and the sensing device. This indicates the initial distance between the sensing device and the base station. Indicates the vertex angle of the base station. This indicates the initial distance between the target and the base station. This indicates the precise azimuth angle of the sensing device relative to the base station.

10. The base station positioning service enhancement method based on inter-node short-range communication sensing according to claim 9, characterized in that: In the enhanced mode 2, the sensing device autonomously calculates its positioning information based on the near-field communication sensing measurement results and the positioning information from the location management function, and then reports the final positioning result to the location management function.

Images