A navigation system based on PRS channel in 5GNR system

Abstract

The present invention proposes a navigation system based on the PRS channel under the 5GNR system, which belongs to the field of 5GNR communication and navigation. A navigation system based on the PRS channel under the 5GNR system includes multiple base stations serving user terminals, each base station has its own PRS channel opened, the PRS channels of multiple base stations form a PRS positioning set, and the PRS positioning set is reused as a PRS navigation set, and each base station is configured with its own PRS signal pattern; when the user terminal needs to navigate, the base station obtains the user's position through the positioning function of the PRS channel, and plans the navigation path through the PRS navigation set, and the user terminal determines whether it is walking on the navigation path by measuring the PRS signal changes of the base station on the navigation path. Solve the problem of inaccurate navigation of the user terminal when it cannot obtain map information, environmental information and GPS navigation information, and at the same time, because the navigation information is simplified and formalized, it is also convenient to implement unmanned navigation.

Description

Technical Field

[0001] The present invention belongs to the field of 5GNR communication and navigation, and in particular to a navigation system based on a PRS channel in a 5GNR system. Background Art

[0002] Currently, navigation systems are almost all based on map software and GPS information. The user terminal obtains the current location through GPS, and then obtains the navigation route through the map software. However, this method has several problems:

[0003] 1. When GPS or other satellite positioning signals are unavailable, navigation is not possible.

[0004] 2. When the user is in an open area such as the wild, or in an area that is not covered by the map system or is covered inaccurately. When navigation is needed in such a scenario, the map system is useless.

[0005] 3. When users are in a scene with poor visibility, it is difficult to find the way through the direction map and surrounding reference objects on the navigation device.

[0006] For some specific scenarios, such as field exploration, mines, field combat, etc., these restrictions will greatly limit people's actions. Summary of the invention

[0007] The present invention proposes a navigation system based on the PRS channel under the 5GNR system for realizing navigation without using GPS and map information.

[0008] A navigation system based on the PRS channel in a 5GNR system includes multiple base stations serving user terminals, each base station has its own PRS channel opened, the PRS channels of the multiple base stations form a PRS positioning set, and the PRS positioning set is multiplexed into a PRS navigation set. Each base station is configured with its own PRS signal pattern, and the navigation method is as follows: s1. When a user needs to navigate, the user sets the destination, and then the base station obtains the user's location through the positioning function of the PRS channel and plans a navigation path; s2. The PRS navigation set informs the user to use the PRS signal of the first base station as a reference signal, and to move in the direction where the reference signal strength change meets the threshold, and informs the user of the calculated AoA angle range;

[0009] s3. The user starts to try to move in N different directions, and keeps measuring the strength value and AoA value of the PRS signal of the first base station, and obtains path 1 that meets the requirements of the PRS signal strength value change and AoA value. The user reaches switching point 1 along path 1; s4. The PRS positioning set finds that the user has reached switching point 1, informs the user to use the PRS signal of the second base station as the reference signal, and move in the direction where the PRS signal strength change meets the set threshold, and informs the user of the AoA angle range, and repeats the above steps s1-s3 until the end is reached.

[0010] Furthermore, the PRS signal pattern configured by the base station includes the frequency domain and transmission time of the PRS signal.

[0011] Further, the user terminal is used to display the RSRP strength value and AoA angle range of the PRS signal.

[0012] Furthermore, the user determines whether the traveling direction is off course by using the received AoA value.

[0013] Furthermore, the PRS navigation set includes one or more PRS positioning sets.

[0014] Furthermore, the threshold value set in step s2 may be higher or lower than the reference signal strength.

[0015] Furthermore, the user terminal includes a mobile phone and a computer.

[0016] Furthermore, the user terminal is provided with an alarm module, and the alarm module is used to send alarm information to the user.

[0017] Furthermore, there are at least three base stations in one positioning set.

[0018] Furthermore, the user's navigation request is initiated by the user terminal or the network side.

[0019] Beneficial effects: The present invention forms a PRS positioning set through a PRS channel, and multiplexes the PRS positioning set as a navigation set. Through the reasonable use of the RPS signal in the navigation set, navigation guidance is provided to the user terminal, solving the problem of inaccurate navigation when the user terminal cannot obtain map software and GPS navigation information. In addition, the PRS channel of the present invention not only realizes precise positioning at any position, but also can continuously update the positioning information during the movement. By coordinating the pattern of the PRS signal transmitted by each PRS signal transmitting point under the positioning set, that is, the frequency domain characteristics and time requirements of the PRS signal transmitted by each PRS signal transmitting point, the PRS signals existing at the same time will not interfere with each other to ensure the accuracy of navigation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the PRS positioning set coverage of a navigation system based on the PRS channel in a 5GNR system proposed in the present invention;

[0021] Figure 2 A navigation schematic diagram of a cellular wireless communication system based on a navigation system of a PRS channel in a 5GNR system proposed by the present invention;

[0022] Figure 3 This is a schematic diagram of navigation from a starting point to an end point for a user of a navigation system based on a PRS channel in a 5G NR system proposed in the present invention. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is described below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] The present invention uses the PRS (Positioning Reference Signal) channel newly added in 3GPP R16 under the 5GNR system to realize a system that can realize navigation without using GPS and map information.

[0025] A navigation system based on the PRS channel under the 5GNR system includes multiple base stations serving user terminals, each base station has its own PRS channel opened, the PRS channels of multiple base stations form a PRS positioning set, and the PRS positioning set is multiplexed into a PRS navigation set. Each base station is configured with its own PRS signal pattern, and the PRS signal pattern includes the frequency domain of the transmitted PRS signal and the time of its transmission. When the user terminal needs to navigate, the base station obtains the user's position through the positioning function of the PRS channel, and plans the navigation path through the PRS navigation set. The user terminal determines whether it is walking on the navigation path by measuring the changes in the PRS signals of the base stations on the navigation path. The PRS signal pattern configured by the base station includes the frequency domain characteristics and time requirements of the PRS signal. The base station side obtains the position of the user terminal through the PRS channel and its positioning function, such as mature methods such as standard DL-TDOA or Multi-RTT. In order to meet the minimum positioning standard, there are at least 3 base stations under each PRS positioning set, which can be adjusted according to the actual situation and navigation range.

[0026] The user terminal or the network side initiates a navigation request, and the base station side receives the navigation request and plans the optimal navigation path. The planning model of the optimal navigation path is that the user starts from the current starting point, takes a certain PRS signal as a reference, and uses its signal strength as a basis for judgment, and then switches to another PRS signal as a reference, and takes the new PRS signal strength and arrival angle as a basis for judgment, and walks to the next position, and so on, until the end. Among them, using signal strength as a basis for judgment can mean that the user is asked to walk in the direction of a strong signal, or in the direction of a weak signal, or a threshold can be set according to actual conditions. Therefore, the planning of the navigation path can be planned according to the standard of increasing PRS signal strength or decreasing PRS signal strength.

[0027] The user terminal measures the PRS signal strength of the specified base station on the navigation path, and determines whether it is on the path to the base station based on the average RSRP power measurement value. If it is not on the path, it will tentatively run around and then observe the measurement value to determine which direction is the correct direction and proceed in that direction. At the same time, the base station can also inform the user of the arrival angle range of the specified PRS signal. The PRS signal itself has the function of measuring DL-AoA. The network side knows the PRS transmission point and the user's location, and can also calculate the AoA value that the user should measure. Then, through the theoretical AoA value, plus the floating deviation, the user is informed of the range of the AoA measurement value that should be maintained during the path. If the value measured by the user is out of range, the user needs to be aware that his path may have deviated and needs to re-test the direction.

[0028] During the user's navigation and movement, the base station side constantly calculates and updates the user's location through the positioning function of the PRS channel, and updates the navigation signal pattern and path in a timely manner. If it is found that the user is not on the navigation path, the alarm module of the user terminal sends an alarm message to the user, including deviation and dangerous area reminders. According to the new position, it calculates whether the navigation information needs to be updated again, and guides the user to re-measure and return to the best navigation path.

[0029] The navigation system proposed by the present invention does not require map information during use, and can accurately find and navigate in an environment without reference objects such as the wild, and can also perform accurate pathfinding and navigation in an environment without visibility such as the night. The user terminal of the present invention includes a mobile phone and a computer. It is also possible to navigate unmanned equipment through the protocolization of the navigation process.

[0030] Reference Figure 2, since the current cellular wireless communication systems are all networked on the same frequency, the signals of each base station will interfere with other base stations. Therefore, each base station will set its transmission power and coverage range. In principle, the signal of each base station should cover as little as possible under the coverage range of other base stations. In the figure below, base station 1, base station 2, and base station 3 each cover their own area (taking omnidirectional antennas as an example). In the edge areas of these ranges, in order to ensure all-terrain signal coverage and user mobility switching requirements, a small number of common coverage areas are generated. Among them, user 1 can only receive the signal of base station 1, user 2 can only receive the signal of base station 2, user 3 can only receive the signal of base station 3, and user 4 can receive the signals of base station 1 and base station 2 at the same time because it is in the signal overlap area. If base station 1 and base station 2 do not coordinate their respective signal modes, then from the perspective of user 4, the signals of base station 1 and base station 2 are each interference signals of each other.

[0031] The introduction of PRS channel signals breaks this boundary problem. Figure 1 , the same three base stations, assuming that they are in a PRS positioning set, they together provide PRS signal coverage for this positioning set area (all areas in the figure). Then the coverage range of their respective PRS channels needs to cover all areas under the positioning set. Then 3GPP coordinates each PRS signal transmission point under the positioning set to transmit the PRS signal pattern, that is, the frequency domain characteristics and time requirements of each PRS signal transmission point transmitting the PRS signal, so that the PRS signals existing at the same time will not interfere with each other. For example, base station 1 sends PRS signal 1 at frequency point 1 at time 1, and base station 2 sends PRS signal 2 at frequency point 2 at time 1. Since their frequency domains are staggered, no interference will occur. Base station 3 sends PRS signals at frequency point 1 at time 2, so it will not interfere with base stations 1 and 2.

[0032] Reference Figure 3, all the coverage areas of this figure are a PRS positioning set area. The PRS signal transmission patterns of all base stations under this positioning set have been planned, supporting users to perform PRS positioning functions in this area. At the same time, this area is also the coverage range of the PRS navigation set. It should be noted that the circular area covered by the base station in this figure is the signal of the ordinary cell. Since this patent uses the PRS signal, it can cross the cell boundary to a very far place. Therefore, the user can receive the PRS signal of other base stations at any position in this figure. The circular area is marked to better illustrate the difference between the present invention and the existing base station signal. The user's application layer puts forward a demand, hoping to reach the end position of the base station 5 area from the starting position of the base station 1 area. The network side knows the dangerous areas in the PRS positioning set area, so it will avoid them in advance when planning the navigation route. The PRS navigation set starts to plan the optimal navigation path, including avoiding users from entering the dangerous areas of base stations 6 and 3. Then follow the following process.

[0033] 1. The PRS navigation set tells the user to use PRS signal 4 of base station 4 as a reference and move in the direction where the signal strength is stronger, and tells the user the angular range of the calculated AoA.

[0034] 2. The user starts to try to walk in different directions and keeps measuring the RSRP strength value of PRS signal 4 and the AoA value of PRS signal 4. Eventually, it is found that only the direction of path 1 can meet the RSPR and AoA requirements. The user reaches switching point 1 along path 1.

[0035] 2. The PRS positioning set finds that the user has reached switching point 1, and then informs the user to use PRS signal 6 of base station 6 as a reference, move in the direction where the signal strength is stronger, and informs the angle range of its AoA.

[0036] 3. After trying different directions, the user finds that only the direction of path 2 can meet the RSPR and AoA requirements and reach switching point 2.

[0037] 4. The PRS positioning set finds that the user has reached switching point 2, and then informs the user to use PRS signal 4 of base station 4 as a reference, move in the direction where the signal strength is stronger, and informs the angle range of its AoA.

[0038] 5. After trying different directions, the user finds that only the direction of path 3 can meet the RSPR and AoA requirements. And reaches switching point 3.

[0039] 6. The PRS positioning set finds that the user has reached switching point 3, and then informs the user to use PRS signal 5 of base station 5 as a reference, move in the direction where the signal strength is stronger, and informs the angle range of its AoA.

[0040] 7. After trying different directions, the user found that only the direction of path 4 could meet the RSPR and AoA requirements and reach the destination.

[0041] 8. The PRS positioning set finds that the user has reached the destination and sends a signal to inform the user that the navigation is over.

[0042] The navigation system based on the PRS channel of the 5GNR system proposed in the present invention not only realizes accurate navigation when there is no GPS and map information, but also ensures that the signals of each base station will not interfere with each other when the signals cover each other. It solves the navigation problem without increasing resource consumption.

Claims

1. A navigation system based on the PRS channel in a 5GNR system, characterized in that: include, There are multiple base stations serving user terminals, each of which has its own PRS channel opened. The PRS channels of multiple base stations form a PRS positioning set, and the PRS positioning set is reused as a PRS navigation set. Each base station is configured with its own PRS signal pattern, and there are at least three base stations under the positioning set; when there are three base stations, and they are in a PRS positioning set, they together provide PRS signal coverage for the positioning set area; then the coverage range of their respective PRS channels needs to cover all areas under the positioning set; then 3GPP coordinates each PRS signal transmission point under the positioning set to transmit the PRS signal pattern, that is, the frequency domain characteristics and time requirements of each PRS signal transmission point transmitting the PRS signal, so that at the same time, PRS signals existing at the same time will not interfere with each other; base station 1 sends PRS signal 1 at frequency 1 at time 1, base station 2 sends PRS signal 2 at frequency 2 at time 1; and base station 3 sends PRS signal at frequency 1 at time 2; The navigation method is as follows: s1. When the user needs navigation, the user sets the destination, and then the base station obtains the user's location through the positioning function of the PRS channel and plans the navigation path; s2. The PRS navigation set informs the user to use the PRS signal of the first base station as the reference signal, and to move in the direction where the reference signal strength change meets the set threshold, and informs the user of the angle range of the calculated AoA; s3. The user starts to try to move in N different directions and keeps measuring the strength value and AoA value of the PRS signal of the first base station, and obtains path 1 that meets the requirements of the strength value change and AoA value of the PRS signal. The user reaches switching point 1 along path 1. s4. The PRS positioning set finds that the user has reached switching point 1, informs the user to use the PRS signal of the second base station as the reference signal, and move in the direction where the PRS signal strength change meets the set threshold, and informs the user of the AoA angle range, repeating the above s1-s3 steps until the end is reached.

2. A navigation system based on a PRS channel in a 5GNR system according to claim 1, characterized in that: The PRS signal pattern configured by the base station includes the frequency domain and transmission time of the PRS signal.

3. A navigation system based on a PRS channel in a 5GNR system according to claim 1, characterized in that: The user terminal is used to display the RSRP strength value and AoA angle range of the PRS signal.

4. A navigation system based on a PRS channel in a 5GNR system according to claim 3, characterized in that: The user determines whether the traveling direction is off course by means of the received AoA value.

5. A navigation system based on a PRS channel in a 5GNR system according to claim 3, characterized in that: The PRS navigation set includes one or more PRS positioning sets.

6. A navigation system based on a PRS channel in a 5GNR system according to claim 1, characterized in that: The set threshold in step s2 may be higher or lower than the reference signal strength.

7. A navigation system based on a PRS channel in a 5GNR system according to claim 1, characterized in that: The user terminal includes a mobile phone and a computer.

8. A navigation system based on a PRS channel in a 5GNR system according to claim 1, characterized in that: The user terminal is provided with an alarm module, and the alarm module is used to send alarm information to the user.

9. A navigation system based on a PRS channel in a 5GNR system according to claim 1, characterized in that: The user's navigation request is initiated by the user terminal or the network side.

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