Base station positioning service enhancement method based on inter-node near field communication perception

Abstract

The invention discloses a base station positioning service enhancement method based on inter-node near field communication perception, and the method specifically comprises the following steps: deploying a sensing device in an edge region of a coverage range of a base station, and aligning a measurement coordinate system of the base station and the sensing device in advance; accessing the sensing device to a base station, providing a preliminary positioning service, and obtaining a preliminary positioning parameter; the positioning target reports a positioning enhancement request according to the position relationship with the base station; after the base station receives the positioning enhancement request, a corresponding enhancement mode is switched, and the preliminary positioning result and the communication sensing task are coordinated to the sensing equipment of the positioning target; the sensing device obtains an accurate positioning parameter between the sensing device and the positioning target; and the sensing device reports accurate positioning parameters sensed by near field communication, and the base station or the sensing device completes positioning calculation and outputs enhanced positioning parameters. According to the invention, the precision improvement and range expansion of the base station positioning service can be realized, and the method has the characteristics of good stability, strong adaptability and free deployment.

Description

Technical Field

[0001] The present invention relates to the field of remote sensing detection and identification technology, and specifically to a base station positioning service enhancement method based on short-range communication perception between nodes. Background Art

[0002] With the development of B5G / 6G technology, high-precision positioning has become a core requirement in vertical fields such as industrial automation and vehicle-road collaboration. The existing 5G cellular network positioning technology based on single-station measurement of base stations (such as RTT, AOA) is limited by non-line-of-sight propagation, multipath effects and hardware resolution, and the accuracy is only at the meter or decimeter level, which is difficult to meet the centimeter-level scenario requirements. Although the integrated communication and perception (ISAC) can integrate communication and perception functions to improve positioning performance, it requires large-scale transformation of base station hardware (such as adding radar modules), resulting in high deployment costs and incompatibility with existing network architectures. In addition, traditional solutions rely on base station coverage and cannot provide services in blind areas (such as tunnels, indoors) or extreme environments, while relay technology lacks a collaborative perception mechanism and is difficult to ensure positioning continuity. Although the 3GPP Rel-18 standard proposes to enhance 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 intelligent 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 problem that needs to be urgently solved in B5G / 6G networks. Summary of the invention

[0003] The purpose of the present invention is to provide a method for enhancing base station positioning services based on short-range communication perception between nodes. The present invention can improve the accuracy and expand the range of base station positioning services, and has the advantages of good stability, strong adaptability and free deployment.

[0004] The technical solution of the present invention is a method for enhancing base station positioning services based on short-range communication perception between nodes, which specifically includes the following steps:

[0005] Step 1: deploy a telepathic device at the edge of the base station coverage area, and pre-align the measurement coordinate system of the base station and the telepathic device;

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

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

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

[0009] Step 5: The communication and sensing device obtains the accurate positioning parameters between the communication and sensing device and the positioning target through short-range communication perception technology.

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

[0011] In the aforementioned method for enhancing the base station positioning service based on short-range communication perception between nodes, in Step 1, the alignment operation of the measurement coordinate system is to keep the coordinate axes of the base station and the communication and sensing device parallel in the positive direction.

[0012] In the aforementioned method for enhancing the base station positioning service based on short-range communication perception between nodes, in Step 2, the preliminary positioning service specifically means that the base station measures the receive-transmit time difference and the signal arrival angle of the downlink signal, and then the positioning target measures the receive-transmit time difference of the uplink signal. The round-trip time is calculated based on the receive-transmit time difference of the downlink signal and the receive-transmit time difference of the uplink signal, the distance is calculated through the round-trip time, and the preliminary positioning is completed in combination with the signal arrival angle.

[0013] In the aforementioned method for enhancing the base station positioning service based on short-range communication perception between nodes, the calculation formula for the round-trip time RTT is as follows:

[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 represents the receive-transmit time difference of the positioning target, T gNB Rx-Tx represents the receive-transmit time difference of the base station, t0 represents the starting absolute time point when the base station sends the downlink signal, t1 represents the ending absolute time point when the positioning target receives the downlink signal, t2 represents the starting absolute time point when the positioning target sends the uplink signal, and t3 is the ending absolute time point when the base station receives the uplink signal.

[0016] In the aforementioned method for enhancing the base station positioning service based on short-range communication perception between nodes, the distance d UE has the following calculation formula:

[0017]

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

[0019] In the above-mentioned method for enhancing the base station positioning service based on short-range communication perception between nodes, the formula for the preliminary positioning is as follows:

[0020]

[0021] Among them, d UE represents the distance of the positioning target relative to the base station, and θ UE represents the azimuth angle of the positioning target relative to the base station, that is, the angle of arrival of the signal; (x BS , y BS ) represents the base station coordinates, and (x UE , y UE ) are the coordinates of the calculated positioning target.

[0022] In the above-mentioned method for enhancing the base station positioning service based on short-range communication perception between nodes, in step 4, the enhancement mode includes:

[0023] Enhancement mode 1: When the positioning target is within the coverage area of the base station, directly communicate with the base station, obtain the preliminary positioning service of the base station, directly report the positioning enhancement request, and calculate the accurate positioning parameters through the short-range communication perception technology;

[0024] Enhancement mode 2: When the positioning target is outside the coverage area of the base station or there is a line-of-sight obstacle, the positioning target cannot obtain the preliminary positioning service of the base station. The positioning enhancement request is indirectly reported through the communication and sensing device as a relay, and the accurate target position outside the positioning service range is calculated through the short-range communication perception technology to expand the positioning service range.

[0025] In the above-mentioned method for enhancing the base station positioning service based on short-range communication perception between nodes, the enhancement mode 1 includes enhancement mode 1.1 and enhancement mode 1.2;

[0026] The specific content of mode 1.1 is that when facing the situation of long-distance positioning and low angular resolution of the base station, the azimuth angle measurement result of the preliminary positioning service is enhanced, and 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 represents the preliminary distance of the communication and sensing device relative to the base station, dT Represents the preliminary distance of the positioning target relative to the base station, θ represents the azimuth angle of the positioning target relative to the communication and sensing device, d represents the distance of the positioning target relative to the communication and sensing device, α B Represents the vertex angle of the base station, α S Represents the communication and sensing device side angle, θ′ s Represents the accurate azimuth angle of the communication and sensing device relative to the base station, θ′ T Represents the accurate azimuth angle of the positioning target relative to the base station;

[0031] The enhancement mode 1.2 is specifically when facing the situation of severe multipath interference and obvious clock synchronization error, enhancing the distance measurement result of the positioning service. 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 Represents the preliminary azimuth angle of the communication and sensing device relative to the base station, θ T Represents the preliminary azimuth angle of the positioning target relative to the base station, θ represents the azimuth angle of the positioning target relative to the communication and sensing device, d represents the distance of the positioning target relative to the communication and sensing device, α B Represents the vertex angle of the base station, α S Represents the communication and sensing device side angle, d′ s Represents the accurate distance of the communication and sensing device relative to the base station, d′ T Represents the accurate distance of the positioning target relative to the base station.

[0037] In the aforementioned base station positioning service enhancement method based on short - range communication perception between nodes, in the enhancement mode 1, the measurement results are all reported to the location management function, which completes the processing and issues the final positioning result.

[0038] In the aforementioned base station positioning service enhancement method based on short - range communication perception between nodes, the enhancement mode 2 is specifically when facing the situation where the base station cannot directly perform positioning, expanding the scope of the positioning service. The calculation formula is as follows:

[0039] α S =(π - θ S ) + θ;

[0040]

[0041]

[0042] θ′ s = θ S - α B ;

[0043] wherein, α S represents the angle on the cross - sensory device side, θ represents the azimuth angle of the positioning target relative to the cross - sensory device, and θ S represents the preliminary azimuth angle of the cross - sensory device relative to the base station, d′ T represents the precise distance of the positioning target relative to the base station, d represents the distance of the positioning target relative to the cross - sensory device, and d S represents the preliminary distance of the cross - sensory device relative to the base station, and α B represents the vertex angle of the base station, and d T represents the preliminary distance of the positioning target relative to the base station, and θ′ s represents the precise azimuth angle of the cross - sensory device relative to the base station.

[0044] In the aforementioned method for enhancing base station positioning services based on short - range communication perception between nodes, in the enhancement mode 2, the cross - sensory device independently calculates the positioning information based on the measurement results of short - range communication perception and the positioning information of the location management function, and reports the final positioning result to the location management function.

[0045] In the aforementioned method for enhancing base station positioning services based on short - range communication perception between nodes, in step 5, the short - range communication perception technology uses communication - perception integration to obtain precise positioning parameters between the cross - sensory device and the positioning target.

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

[0047] The present invention realizes the enhancement of base station positioning services by deploying cross - sensory devices at the edge of the base station coverage area and based on the short - range communication perception ability of the cross - sensory devices. In addition, in terms of communication, as a communication relay, the present invention utilizes the end - to - end communication ability to carry edge communication services and improve the communication performance of the base station system; in terms of perception, as a perception node, the present invention takes advantage of the good line - of - sight path and stable propagation channel between short - range nodes to obtain precise perception results, thereby improving the positioning service accuracy or expanding the positioning service range.

[0048] The present invention BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 is a schematic flow diagram of the enhancement of the base station positioning service of the present invention;

[0050] Figure 2 Schematic diagram of signaling interaction for the base station single - station positioning service of the present invention;

[0051] Figure 3 Schematic diagram of signaling interaction for the positioning target of the present invention to access the network via communication relay;

[0052] Figure 4 Scenario schematic diagram of the calculation principle of the enhanced mode of the present invention. Detailed implementation manners

[0053] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but it is not used as a basis for limiting the present invention.

[0054] Embodiment 1: An enhanced method for base station positioning service based on short - range communication perception between nodes, as Figure 1 described, specifically includes the following steps:

[0055] Step 1: Deploy sensing devices in the edge area of the base station coverage, 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 system is to keep the coordinate axes of the base station and the sensing devices parallel in the positive direction, ensuring that the measurement results in the local coordinate system can be directly used for calculation in the base station coordinate system. The sensing devices include user terminal devices (such as 5G / 6G mobile phones, tablets, and AR / VR devices supporting Sidelink communication, etc.) and industrial Internet of Things terminals (AGV automatic guided vehicles, robotic arms, etc. in factory automation scenarios).

[0056] Step 2: Connect the sensing devices to the base station, and the base station provides preliminary positioning services for the sensing devices to obtain the preliminary positioning parameters of the base station and the sensing devices; the preliminary positioning service includes uplink and downlink measurement processes, as Figure 2 shown, specifically includes the following steps:

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

[0058] The positioning target in this embodiment refers to the terminal device or object whose position needs to be determined, including but not limited to mobile or fixed objects to be positioned such as smartphones, vehicle-mounted terminals (V2X), industrial robots, drones (UAV), wearable devices (AR / VR), etc.

[0059] Step 2.2: The location management function sends a configuration request message for the uplink sounding reference signal (UL-SRS) to the base station; the base station determines the sounding reference signal (SRS) resources, and sends the sounding reference signal parameters to the user through the RRC reconfiguration (RRC Reconfiguration) message. After the user completes the configuration, the user reports the RRC reconfiguration completion message to the base station; the base station reports the confirmation of the sounding reference signal configuration information to the location management function; RRC reconfiguration is a core signaling process in the mobile communication network, which is 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 the downlink positioning reference signal configuration information to the base station; the location management function sends the 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 start command for the sounding reference signal to the base station; the base station sends the downlink sounding 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 the uplink sounding 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 (Angel of Arrival, AOA) of the signal.

[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 of the base station and the user, calculates the user's position, and completes the preliminary positioning service.

[0063] The calculation formula of 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-TxIndicates the time difference between reception and transmission of the user equipment, T gNB Rx-Tx Indicates the time difference between reception and transmission of the base station. t0 represents the starting absolute time point when the base station sends the downlink signal, t1 represents the ending absolute time point when the user equipment receives the downlink signal, t2 represents the starting absolute time point when the user equipment sends the uplink signal, and t3 is the ending absolute time point when the base station receives the uplink signal. During this process, t0, t3 and t1, t2 are the differences under the same-side time systems of the base station and the user respectively. Therefore, perfect synchronization between the base station and the user is not required during the RTT measurement process.

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

[0067]

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

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

[0070]

[0071] Among them, d UE Represents the distance of the user relative to the base station, θ UE Represents the azimuth angle of the user relative to the base station, that is, the angle of signal arrival; (x BS , y BS ) represents the coordinates of the base station, (x UE , y UE ) are the user coordinates obtained by the positioning calculation.

[0072] According to the above formula, the result of the preliminary positioning service of the base station is the azimuth angle θ of the communication sensing device relative to the base station S , the preliminary distance d of the communication sensing device relative to the base station S , the azimuth angle θ of the positioning target relative to the base station T and the preliminary distance d of the positioning target relative to the base station T .

[0073] Step 3: Report a positioning enhancement request according to the positional relationship between the positioning 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 result with the communication sensing task to the communication 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 a positioning enhancement request, and calculates accurate positioning parameters through short-range communication sensing technology; the Enhanced Mode 1 includes Enhanced Mode 1.1 and Enhanced Mode 1.2;

[0076] The Mode 1.1 is used to synchronously improve the accuracy of the azimuth angle parameter. Specifically, when facing the situation of long-distance positioning and low angle resolution of the base station, applying this mode can enhance the azimuth angle measurement result of the preliminary 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 represents the preliminary distance of the communication and sensing device relative to the base station, d T represents the preliminary distance of the positioning target relative to the base station, θ represents the azimuth angle of the positioning target relative to the communication and sensing device, d represents the distance of the positioning target relative to the communication and sensing device, α B represents the vertex angle of the base station, α S represents the side angle of the communication and sensing device, θ′ s represents the accurate azimuth angle of the communication and sensing device relative to the base station, θ′ T represents the accurate azimuth angle of the positioning target relative to the base station.

[0081] The Enhanced Mode 1.2 is used to synchronously improve the accuracy of the distance parameter. Specifically, when facing the situation of severe multipath interference and obvious clock synchronization error, applying this mode can enhance the distance measurement result 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 Indicates the preliminary azimuth angle of the multisensory device relative to the base station, θ T Indicates the preliminary azimuth angle of the positioning target relative to the base station, θ indicates the azimuth angle of the positioning target relative to the multisensory device, d indicates the distance of the positioning target relative to the multisensory device, α B Indicates the vertex angle of the base station, α S Indicates the multisensory device side angle, d′ s Indicates the precise distance of the multisensory device relative to the base station, d′ T Indicates the precise distance of the positioning target relative to the base station.

[0087] Enhanced mode 2: Used to expand the positioning service range. When the positioning target is outside the coverage of the base station or there are obstacles in the line-of-sight (LOS) route, the positioning target cannot obtain the preliminary positioning service of the base station. In this embodiment, the positioning enhancement request is indirectly reported through the multisensory device as a relay via Sidelink, and the precise target position outside the positioning service range is calculated through the short-range communication sensing technology.

[0088] The specific enhanced mode 2 is to expand the positioning service range when the base station cannot directly perform positioning. 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 Indicates the multisensory device side angle, θ indicates the azimuth angle of the positioning target relative to the multisensory device, θ S Indicates the preliminary azimuth angle of the multisensory device relative to the base station, d′ T Indicates the precise distance of the positioning target relative to the base station, d indicates the distance of the positioning target relative to the multisensory device, d S Indicates the preliminary distance of the multisensory device relative to the base station, α B Indicates the vertex angle of the base station, d T Indicates the preliminary distance of the positioning target relative to the base station, θ′ s Indicates the precise azimuth angle of the multisensory device relative to the base station.

[0093] In this embodiment, if the positioning target is within the coverage of the base station, the corresponding enhanced mode 1 base station provides preliminary positioning services for the positioning target. If the positioning target is outside the coverage of the base station, corresponding to the enhanced mode 2, the base station cannot provide preliminary positioning services for the positioning target. Instead, a positioning enhancement request needs to be reported via Sidelink through the sensing device. After resource configuration for the sensing device is completed, the sensing device continues with positioning measurement and calculation. Sidelink is a device-to-device direct communication technology defined in the 3GPP standard that allows users to directly exchange data without the need for a base station relay. As Figure 3 shown, the process by which the positioning target accesses the 5G core network via the sensing device as a relay includes the following steps:

[0094] Step 4.1: The positioning target and the sensing device implement the discovery and access process of Sidelink through 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 positioning target continuously scans and listens for discovery signals, and completes authentication and authorization based on the 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 the sensing device 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 Uu interface configuration; the base station sends RRC reconfiguration information to the positioning target; the PC5 interface bearer configuration is completed between the positioning device and the communication device; The Uu interface is the wireless air interface between the user and the base station, and bearer configuration is the core process of establishing and managing the data transmission channel on this interface, directly affecting communication quality, rate, and reliability.

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

[0098] Step 5: The synesthesia device obtains accurate positioning parameters between the synesthesia device and the positioning target through short-range communication sensing technology; the positioning parameters include the distance d of the positioning target relative to the synesthesia device and the azimuth angle θ of the positioning target relative to the synesthesia device; the short-range communication sensing technology can be selected from the following types:

[0099] 1. Traditional radar: By transmitting electromagnetic waves and receiving target reflection signals, and using signal time delay and Doppler frequency shift to measure information such as distance, speed, and angle, it has a highly mature technical foundation, but it will increase the hardware complexity of the synesthesia device and has high requirements for signal processing capabilities;

[0100] 2. Sidelink measurement: Following the 5G NR base station positioning protocol, relative positioning is completed through the reception and measurement of reference signals, which has high accuracy, but it is necessary to ensure communication quality and is easily interfered by complex channel environments;

[0101] 3. Communication and sensing integration: Utilizing the characteristics of 5G NR, joint communication and sensing are used for waveform design, specific synesthesia signals are transmitted and reflected signals are received to measure information such as distance and angle, and high-precision positioning can be achieved with low overhead, but it requires the installation of relevant antenna arrays and other supports.

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

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

[0104] In this example, the calculation methods of this step are divided into the following types:

[0105] Type 1, network side: The measurement results are all reported to the location management function, which completes the processing and issues the final positioning result, that is, the 5G NR network provides the computing power;

[0106] Type 2, user side: The synesthesia device independently 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 edge intelligent node provides the computing power;

[0107] During this process, preferably, type 1 is adopted for enhanced mode 1, and type 2 is adopted for enhanced mode 2 for positioning calculation.

[0108] If the positioning target is outside the base station coverage area at this time, as Figure 4 shown, enhanced mode 2 is adopted and the distance and azimuth angle parameters of the positioning target are calculated, and then the complete coordinate information is obtained to realize the expansion of the base station positioning range.

[0109] In this embodiment, the positioning target is slowly approaching the base station. When 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, where the enhanced mode is switched to mode 1. Specifically, the principle can be switched to mode 1.1 or mode 1.2 according to actual needs to calculate more accurate azimuth or distance parameters, thereby improving the positioning accuracy of the base station.

[0110] On the basis of retaining the existing architecture, the present invention makes innovative adjustments with the minimum modification cost, which is reasonable and feasible; considering various position relationships in a comprehensive manner to design the enhanced mode, it has stability and adaptability; different from fixed infrastructures such as intelligent metasurfaces, the communication and sensing device can be freely deployed according to the complex environment, which has simplicity and flexibility.

[0111] In summary, the present invention deploys communication and sensing devices at the edge of the base station coverage area and enhances the base station positioning service based on the short-range communication sensing ability of the communication and sensing devices: in terms of communication, as a communication relay, using the end-to-end communication ability to carry edge communication services and improve the communication performance of the base station system; in terms of sensing, as a sensing node, taking advantage of the good line-of-sight path and stable propagation channel between short-range nodes to obtain accurate sensing results, thereby improving the positioning service accuracy or expanding the positioning service range.

Claims

1. A method for enhancing the base station positioning service based on short-range communication perception between nodes, characterized in that Specifically, it includes the following steps: Step 1: Deploy a communication and sensing device in the edge area of the base station coverage, and pre-align the measurement coordinate systems of the base station and the communication and sensing device; Step 2: Connect the communication and sensing device to the base station. The base station provides preliminary positioning services for the communication and sensing device to obtain the preliminary positioning parameters of the base station and the communication and sensing device; Step 3: The positioning target reports a positioning enhancement request according to its position 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 result and the communication and sensing task to the communication and sensing device of the positioning target; Step 5: The communication and sensing device obtains accurate positioning parameters between the communication and sensing device and the positioning target through short-range communication and sensing technology; Step 6: The communication and sensing device reports the accurate positioning parameters of short-range communication and sensing. The base station or the communication and sensing device completes the positioning calculation and outputs the enhanced positioning parameters.

2. The method for enhancing the base station positioning service based on the perception of short-range communication between nodes according to claim 1, wherein: In Step 1, the alignment operation of the measurement coordinate system is to keep the coordinate axes of the base station and the communication and sensing device parallel in the positive direction.

3. The method for enhancing the base station positioning service based on the proximity communication perception between nodes according to claim 1, wherein: In Step 2, the preliminary positioning service is specifically that the base station measures the receive-transmit time difference and the signal arrival angle of the downlink signal, and then the positioning target measures the receive-transmit time difference of the uplink signal. The round-trip time is calculated based on the receive-transmit time difference of the downlink signal and the receive-transmit time difference of the uplink signal. The distance is calculated through the round-trip time, and the preliminary positioning is completed in combination with the signal arrival angle.

4. The method for enhancing the base station positioning service based on the proximity communication perception between nodes according to claim 3, wherein: The calculation formula of the round-trip time RTT is as follows: RTT = T UE Rx-Tx + T gNB Rx-Tx = (t1 - t0)+(t3 - t2)=(t3 - t0)-(t2 - t1); where T UE Rx-Tx represents the receive - transmit time difference of the positioning target, T gNB Rx-Tx represents the receive - transmit time difference of the base station, t0 represents the starting absolute time point when the base station sends the downlink signal, t1 represents the ending absolute time point when the positioning target receives the downlink signal, t2 represents the starting absolute time point when the positioning target sends the uplink signal, and t3 is the ending absolute time point when the base station receives the uplink signal.

5. The method for enhancing the base station positioning service based on the perception of short-distance communication between nodes according to claim 4, characterized in that: The distance d UE is calculated as follows: Where RTT represents the round-trip time and c represents the speed of light.

6. The method for enhancing base station positioning service based on short-distance communication perception between nodes according to claim 5, characterized in that: The formula for the preliminary positioning is as follows: where d UE represents the distance between the positioning target and the base station, and θ UE represents the azimuth angle of the positioning target relative to the base station, that is, the angle of arrival of the signal; (x BS , y BS ) represents the coordinates of the base station, and (x UE , y UE ) are the coordinates of the calculated positioning target.

7. The method for enhancing the base station positioning service based on the perception of short-range communication between nodes according to claim 1, wherein: In Step 4, the enhancement modes include: Enhancement Mode 1: When the positioning target is within the coverage 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 accurate positioning parameters through short-range communication and sensing technology; Enhancement Mode 2: When the positioning target is outside the coverage of the base station or there is a line-of-sight obstacle, the positioning target cannot obtain the preliminary positioning service of the base station. The positioning target indirectly reports the positioning enhancement request through the communication and sensing device as a relay, and calculates the accurate target position outside the positioning service range through short-range communication and sensing technology to expand the positioning service range.

8. The method for enhancing the base station positioning service based on the perception of short-range communication between nodes according to claim 7, wherein: Enhancement Mode 1 includes Enhancement Mode 1.1 and Enhancement Mode 1.2; Specifically, in Mode 1.1, when facing the situation of long-distance positioning and low angular resolution of the base station, the azimuth measurement result of the preliminary positioning service is enhanced, and the calculation formula is as follows: θ′ s = π - (α S - θ) - α B ; θ′ T = π - (α S - θ); Where d S represents the preliminary distance of the synesthesia device relative to the base station, d T represents the preliminary distance of the positioning target relative to the base station, θ represents the azimuth angle of the positioning target relative to the synesthesia device, d represents the distance of the positioning target relative to the synesthesia device, α B represents the vertex angle of the base station, α S represents the synesthesia device side angle, θ′ s represents the accurate azimuth angle of the synesthesia device relative to the base station, θ′ T represents the accurate azimuth angle of the positioning target relative to the base station; Specifically, in Enhancement Mode 1.2, when facing the situation of serious multipath interference and obvious clock synchronization error, the distance measurement result of the positioning service is enhanced, and the calculation formula is as follows: α B = θ S - θ T ; α S = (π - θ S ) + θ; α T = θ T + θ; Where, θ S represents the preliminary azimuth angle of the synaesthesia device relative to the base station, θ T represents the preliminary azimuth angle of the positioning target relative to the base station, θ represents the azimuth angle of the positioning target relative to the synaesthesia device, d represents the distance between the positioning target and the synaesthesia device, α B represents the vertex angle of the base station, α S represents the synaesthesia device side angle, d′ s represents the accurate distance between the synaesthesia device and the base station, d′ T represents the accurate distance between the positioning target and the base station.

9. The method for enhancing the base station positioning service based on the perception of short-range communication between nodes according to claim 8, characterized in that: In Enhancement Mode 1, the measurement results are all reported to the location management function, and the location management function completes the processing and issues the final positioning result.

10. The method for enhancing the base station positioning service based on the perception of short - range communication between nodes according to claim 7, wherein: Specifically, in Enhancement Mode 2, when facing the situation where the base station cannot directly perform positioning, the positioning service range is expanded, and the calculation formula is as follows: α S = (π - θ S ) + θ; θ′ s = θ S - α B ; Where, α S represents the angle on the side of the synesthesia device, θ represents the azimuth angle of the positioning target relative to the synesthesia device, and θ S represents the preliminary azimuth angle of the synesthesia device relative to the base station, and d′ T represents the accurate distance of the positioning target relative to the base station, d represents the distance of the positioning target relative to the synesthesia device, and d S represents the preliminary distance of the synesthesia device relative to the base station, and α B represents the vertex angle of the base station, and d T represents the preliminary distance of the positioning target relative to the base station, and θ′ s represents the accurate azimuth angle of the synesthesia device relative to the base station.

11. The method for enhancing the base station positioning service based on the perception of short - range communication between nodes according to claim 10, wherein: In Enhancement Mode 2, the communication and sensing device independently calculates the positioning information based on the measurement results of short-range communication and sensing and the positioning information of the location management function, and reports the final positioning result to the location management function.

12. The method for enhancing the base station positioning service based on the perception of short - distance communication between nodes according to claim 1, characterized in that: In step 5, the proximity communication sensing technology uses communication-sensing integration to obtain accurate positioning parameters between the communication and sensing device and the positioning target.

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