Spatial distribution method of electronic price tag base station, terminal, and computer readable medium

Abstract

The application discloses a kind of electronic price tag base station's spatial distribution method, terminal and computer readable medium, the method includes the following steps: obtaining the transmitting power and receiving sensitivity of base station;According to the transmitting power and the receiving sensitivity, the distance between two adjacent base stations is calculated;According to the distance between two adjacent base stations, the base station is arranged in matrix form.The technical scheme of the present application calculates the distance between two adjacent base stations by transmitting power and receiving sensitivity, and arranges the base station in matrix form according to the distance between two adjacent base stations, optimizes the spatial layout of the base station, effectively reduces the mutual interference between base stations while achieving spatial effective coverage, and improves the working efficiency of the base station.

Description

Technical Field

[0001] This invention relates to the field of Internet of Things (IoT) price tag technology, and in particular to a spatial distribution method for electronic price tag base stations, a terminal, and a computer-readable medium. Background Technology

[0002] Electronic price tags, also known as electronic shelf labels (ESLs), are electronic display devices with information transmission and reception functions. They are placed on shelves and can replace traditional paper price tags.

[0003] A price tag base station access point (ESL Access Point, hereinafter referred to as a base station) is an intermediate node between electronic price tags and network back-end servers. It is a device that converts data into electromagnetic wave signals and electromagnetic wave signals into network data, and is the core node of the entire system.

[0004] In the entire electronic shelf label system, the core module is the communication module. Considering cost and application effectiveness, the selection of communication modules is limited. Wi-Fi consumes too much power, so the only option is to use a Bluetooth module. A Bluetooth Low Energy (BLE) module combined with a button battery can have a lifespan of several years. The Bluetooth module operates in the 2400MHz~2483MHz frequency band. The combination of a broadcast gateway and three data gateways requires allocating a broadcast channel for the broadcast gateway and three data channels for the three data gateways. With the frequency hopping mechanism, three additional frequency hopping channels need to be reserved for the data gateways. During system operation, the broadcast channel occupies a certain amount of bandwidth. If data channels or frequency hopping channels are placed near the broadcast channel, it will significantly impact the transmit and receive performance of the data gateways.

[0005] Interference can occur at gateways within a base station, and similarly, interference can occur between gateways between base stations. When two base stations are within their protection zone, especially when broadcast signals are constantly active, they can crosstalk to each other's gateways, causing data retransmission or loss. In real-world scenarios, the most direct result is map push failure. In actual scenarios, a retail store typically has more than two base stations, making the base station environment more complex and significantly increasing the probability of interference between base stations. Therefore, it is necessary to plan frequency and space resources carefully. Summary of the Invention

[0006] The main objective of this invention is to provide a spatial distribution method, terminal, and computer-readable medium for electronic price tag base stations, aiming to optimize the spatial distribution of base stations and effectively reduce interference.

[0007] To achieve the above objectives, the present invention proposes a spatial distribution method for electronic price tag base stations, comprising the following steps:

[0008] Obtain the base station's transmit power and receive sensitivity;

[0009] Calculate the distance between two adjacent base stations based on the transmit power and the receive sensitivity;

[0010] The base stations are arranged in a matrix according to the distance between two adjacent base stations.

[0011] Optionally, the step of calculating the distance between two adjacent base stations includes:

[0012] The distance between two adjacent base stations is calculated according to a preset formula.

[0013] Optionally, the step of calculating the distance between two adjacent base stations according to a preset formula includes:

[0014] Calculate the maximum distance between two adjacent base stations;

[0015] Calculate the minimum distance between two adjacent base stations.

[0016] Optionally, the step of calculating the maximum distance between two adjacent base stations includes:

[0017] According to the formula Calculate the radiation intensity, where, P ( d () represents radiation intensity. P 0 represents the transmission power of the base station; D is the signal path loss value; D is the distance.

[0018] make And according to the formula Calculate the maximum distance between two adjacent base stations, where, The distance between two adjacent base stations; The receiving sensitivity of the base station is denoted as .

[0019] Optionally, the step of calculating the minimum distance between two adjacent base stations includes:

[0020] Configure the channels of two adjacent base stations so that the channel spacing between the two adjacent base stations is greater than or equal to 2MHz;

[0021] The minimum distance between two adjacent base stations is calculated based on the channel spacing between them.

[0022] Optionally, the step of calculating the minimum distance between two adjacent base stations based on the channel spacing between them includes:

[0023] When the channel spacing between two adjacent base stations is greater than or equal to 2MHz and less than 3MHz, according to the formula... Calculate the minimum distance between two adjacent base stations.

[0024] Optionally, the step of calculating the minimum distance between two adjacent base stations based on the channel spacing between them includes:

[0025] When the channel spacing between two adjacent base stations is greater than or equal to 3MHz, according to the formula... Calculate the minimum distance between two adjacent base stations.

[0026] Optionally, the preset formula is: .

[0027] Furthermore, the present invention also proposes a terminal, including a memory, a processor, and an implementation program for a spatial distribution method of electronic price tag base stations stored in the memory and executable on the processor. When the implementation program for the spatial distribution method of electronic price tag base stations is executed by the processor, the following steps are taken:

[0028] Obtain the base station's transmit power and receive sensitivity;

[0029] Calculate the distance between two adjacent base stations based on the transmit power and the receive sensitivity;

[0030] The base stations are arranged in a matrix according to the distance between two adjacent base stations.

[0031] Furthermore, the present invention also proposes a computer-readable medium storing an implementation program for a spatial distribution method of electronic price tag base stations. When the implementation program for the spatial distribution method of electronic price tag base stations is executed, it performs the following steps:

[0032] Obtain the base station's transmit power and receive sensitivity;

[0033] Calculate the distance between two adjacent base stations based on the transmit power and the receive sensitivity;

[0034] The base stations are arranged in a matrix according to the distance between two adjacent base stations.

[0035] The technical solution of this invention calculates the distance between two adjacent base stations by measuring the transmission power and the receiving sensitivity, and arranges the base stations in a matrix according to the distance between the two adjacent base stations, thereby optimizing the spatial layout of the base stations. While achieving effective spatial coverage, it effectively reduces mutual interference between base stations and improves the working efficiency of the base stations. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0037] Figure 1 A schematic diagram of the hardware structure of a mobile terminal to implement various embodiments of the present invention;

[0038] Figure 2 A communication network system architecture diagram provided for an embodiment of the present invention;

[0039] Figure 3 This is a flowchart of an embodiment of the spatial distribution method for electronic price tag base stations of the present invention;

[0040] Figure 4 A flowchart of one embodiment of the steps for calculating the distance between two adjacent base stations according to a preset formula;

[0041] Figure 5 for Figure 4 The flowchart shown is an embodiment of the steps for calculating the maximum distance between two adjacent base stations;

[0042] Figure 6 for Figure 4 The flowchart shown is an embodiment of the steps for calculating the minimum distance between two adjacent base stations;

[0043] Figure 7 This is a schematic diagram of the two-dimensional radiation intensity of a base station;

[0044] Figure 8 This is a schematic diagram of a rectangular distribution;

[0045] Figure 9 This is a schematic diagram of the overlapping radiation locations.

[0046] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0047] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0048] In the following description, the use of suffixes such as "module," "part," or "unit" to denote elements is solely for the purpose of illustrative purposes and has no specific meaning in itself. Therefore, "module," "part," or "unit" may be used interchangeably.

[0049] Terminals can be implemented in various forms. For example, the terminals described in this invention may include mobile terminals such as mobile phones, tablets, laptops, handheld computers, personal digital assistants (PDAs), portable media players (PMPs), navigation devices, wearable devices, smart bracelets, pedometers, etc., as well as fixed terminals such as digital TVs and desktop computers.

[0050] The following description will use a mobile terminal as an example. Those skilled in the art will understand that, apart from elements specifically designed for mobile purposes, the construction according to embodiments of the present invention can also be applied to fixed-type terminals.

[0051] Please see Figure 1 This is a schematic diagram of the hardware structure of a mobile terminal implementing various embodiments of the present invention. The mobile terminal 100 may include: an RF (Radio Frequency) unit 101, a WiFi module 102, an audio output unit 103, an A / V (Audio / Video) input unit 104, a sensor 105, a display unit 106, a user input unit 107, an interface unit 108, a memory 109, a processor 110, and a power supply 111, etc. Those skilled in the art will understand that... Figure 1 The mobile terminal structure shown does not constitute a limitation on the mobile terminal. The mobile terminal may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0052] The following is combined Figure 1 A detailed introduction to each component of the mobile terminal:

[0053] The radio frequency unit 101 can be used for receiving and transmitting signals during information transmission or calls. Specifically, it receives downlink information from the base station and processes it with the processor 110; additionally, it transmits uplink data to the base station. Typically, the radio frequency unit 101 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low-noise amplifier, and a duplexer. Furthermore, the radio frequency unit 101 can also communicate wirelessly with networks and other devices. The aforementioned wireless communications may use any communication standard or protocol, including but not limited to GSM (Global System of Mobile communication), GPRS (General Packet Radio Service), CDMA2000 (Code Division Multiple Access 2000), WCDMA (Wideband Code Division Multiple Access), TD-SCDMA (Time Division-Synchronous Code Division Multiple Access), FDD-LTE (Frequency Division Duplexing-Long Term Evolution), and TDD-LTE (Time Division Duplexing-Long Term Evolution).

[0054] WiFi is a short-range wireless transmission technology. Mobile terminals using the WiFi module 102 can help users send and receive emails, browse web pages, and access streaming media, providing users with wireless broadband internet access. Although Figure 1 WiFi module 102 is shown, but it is understood that it is not a necessary component of a mobile terminal and can be omitted as needed without changing the nature of the invention.

[0055] The audio output unit 103 can convert audio data received by the radio frequency unit 101 or the WiFi module 102 or stored in the memory 109 into audio signals and output them as sound when the mobile terminal 100 is in call signal receiving mode, call mode, recording mode, voice recognition mode, broadcast receiving mode, etc. Furthermore, the audio output unit 103 can also provide audio output related to specific functions performed by the mobile terminal 100 (e.g., call signal receiving sound, message receiving sound, etc.). The audio output unit 103 may include a speaker, a buzzer, etc.

[0056] The A / V input unit 104 is used to receive audio or video signals. The A / V input unit 104 may include a graphics processing unit (GPU) 1041 and a microphone 1042. The GPU 1041 processes image data of still images or videos acquired by an image capture device (such as a camera) in video capture mode or image capture mode. The processed image frames can be displayed on the display unit 106. The image frames processed by the GPU 1041 can be stored in the memory 109 (or other storage media) or transmitted via the radio frequency unit 101 or the WiFi module 102. The microphone 1042 can receive sound (audio data) in operating modes such as telephone call mode, recording mode, and voice recognition mode, and can process such sound into audio data. The processed audio (voice) data can be converted into a format that can be transmitted to a mobile communication base station via the radio frequency unit 101 in telephone call mode. The microphone 1042 can implement various types of noise cancellation (or suppression) algorithms to eliminate (or suppress) noise or interference generated during the reception and transmission of audio signals.

[0057] The mobile terminal 100 also includes at least one sensor 105, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor includes an ambient light sensor and a proximity sensor. The ambient light sensor can adjust the brightness of the display panel 1061 according to the ambient light level, and the proximity sensor can turn off the display panel 1061 and / or backlight when the mobile terminal 100 is moved to the ear. As a type of motion sensor, the accelerometer sensor can detect the magnitude of acceleration in various directions (generally three axes). When stationary, it can detect the magnitude and direction of gravity and can be used for applications that recognize the phone's posture (such as landscape / portrait switching, related games, magnetometer posture calibration), vibration recognition-related functions (such as pedometer, tapping), etc. Other sensors that may be configured in the phone, such as fingerprint sensors, pressure sensors, iris sensors, molecular sensors, gyroscopes, barometers, hygrometers, thermometers, and infrared sensors, will not be described in detail here.

[0058] The display unit 106 is used to display information input by the user or information provided to the user. The display unit 106 may include a display panel 1061, which may be configured in the form of a liquid crystal display (LCD), an organic light-emitting diode (OLED), or the like.

[0059] User input unit 107 can be used to receive input numerical or character information, and generate key signal inputs related to user settings and function control of the mobile terminal. Specifically, user input unit 107 may include touch panel 1071 and other input devices 1072. Touch panel 1071, also known as touch screen, can collect touch operations on or near the user (such as operations performed by the user using a finger, stylus, or any suitable object or accessory on or near touch panel 1071), and drive corresponding connection devices according to a pre-set program. Touch panel 1071 may include two parts: a touch detection device and a touch controller. The touch detection device detects the user's touch position and the signal generated by the touch operation, and transmits the signal to the touch controller; the touch controller receives touch information from the touch detection device, converts it into touch point coordinates, sends it to processor 110, and can receive and execute commands from processor 110. In addition, touch panel 1071 can be implemented using various types such as resistive, capacitive, infrared, and surface acoustic wave. In addition to the touch panel 1071, the user input unit 107 may also include other input devices 1072. Specifically, other input devices 1072 may include, but are not limited to, one or more of the following: physical keyboard, function keys (such as volume control buttons, power buttons, etc.), trackball, mouse, joystick, etc., without being limited here.

[0060] Furthermore, the touch panel 1071 may cover the display panel 1061. When the touch panel 1071 detects a touch operation on or near it, it transmits the information to the processor 110 to determine the type of touch event. Subsequently, the processor 110 provides corresponding visual output on the display panel 1061 based on the type of touch event. Although in Figure 1 In this embodiment, the touch panel 1071 and the display panel 1061 are two independent components to realize the input and output functions of the mobile terminal. However, in some embodiments, the touch panel 1071 and the display panel 1061 can be integrated to realize the input and output functions of the mobile terminal. The specific implementation is not limited here.

[0061] Interface unit 108 serves as an interface through which at least one external device can connect to mobile terminal 100. For example, the external device may include a wired or wireless headset port, an external power supply (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device with an identification module, an audio input / output (I / O) port, a video I / O port, a headphone port, and so on. Interface unit 108 may be used to receive input (e.g., data, power, etc.) from the external device and transmit the received input to one or more elements within mobile terminal 100, or it may be used to transmit data between mobile terminal 100 and the external device.

[0062] The memory 109 can be used to store software programs and various data. The memory 109 may primarily include a program storage area and a data storage area. The program storage area may store the operating system, applications required for at least one function (such as sound playback, image playback, etc.), etc.; the data storage area may store data created based on the use of the mobile phone (such as audio data, phonebook, etc.). Furthermore, the memory 109 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device.

[0063] The processor 110 is the control center of the mobile terminal. It connects various parts of the mobile terminal via various interfaces and lines. By running or executing software programs and / or modules stored in the memory 109, and by calling data stored in the memory 109, it performs various functions and processes data of the mobile terminal, thereby providing overall monitoring of the mobile terminal. The processor 110 may include one or more processing units; preferably, the processor 110 may integrate an application processor and a modem processor. The application processor mainly handles the operating system, user interface, and applications, while the modem processor mainly handles wireless communication. It is understood that the modem processor may not be integrated into the processor 110.

[0064] The mobile terminal 100 may also include a power supply 111 (such as a battery) that supplies power to various components. Preferably, the power supply 111 can be logically connected to the processor 110 through a power management system, thereby enabling functions such as charging, discharging, and power consumption management through the power management system.

[0065] although Figure 1 As not shown, the mobile terminal 100 may also include a Bluetooth module, etc., which will not be described in detail here.

[0066] To facilitate understanding of the embodiments of the present invention, the communication network system on which the mobile terminal of the present invention is based is described below.

[0067] Please see Figure 2 , Figure 2 This invention provides a communication network system architecture diagram. The communication network system is an LTE system based on the universal mobile communication technology. The LTE system includes a UE (User Equipment) 201, an E-UTRAN (Evolved UMTS Terrestrial Radio Access Network) 202, an EPC (Evolved Packet Core) 203, and the operator's IP services 204, which are connected in sequence.

[0068] Specifically, UE201 can be the aforementioned terminal 100, which will not be elaborated here.

[0069] E-UTRAN202 includes eNodeB2021 and other eNodeB2022s. Among them, eNodeB2021 can connect to other eNodeB2022s through backhaul (e.g., X2 interface), and eNodeB2021 connects to EPC203. eNodeB2021 can provide UE201 to EPC203 access.

[0070] EPC203 may include MME (Mobility Management Entity) 2031, HSS (Home Subscriber Server) 2032, other MMEs 2033, SGW (Serving Gateway) 2034, PGW (Packet Data Network Gateway) 2035, and PCRF (Policy and Charging Rules Function) 2036, etc. Among them, MME2031 is the control node that handles signaling between UE201 and EPC203, providing bearer and connection management. HSS2032 provides registers to manage functions such as the Home Location Register (not shown in the diagram) and stores user-specific information such as service characteristics and data rates. All user data can be sent through SGW2034. PGW2035 can provide UE 201 IP address allocation and other functions. PCRF2036 is the policy and charging control decision point for service data flow and IP bearer resources. It selects and provides available policy and charging control decisions for the policy and charging enforcement function unit (not shown in the figure).

[0071] IP services 204 may include the Internet, intranet, IMS (IP Multimedia Subsystem), or other IP services.

[0072] Although the above description uses the LTE system as an example, those skilled in the art should understand that the present invention is not only applicable to the LTE system, but also to other wireless communication systems, such as GSM, CDMA2000, WCDMA, TD-SCDMA, and future new network systems, etc., which are not limited here.

[0073] Based on the aforementioned mobile terminal hardware structure and communication network system, various embodiments of the method of the present invention are proposed.

[0074] like Figure 3 As shown, Figure 3 This is a flowchart of an embodiment of the spatial distribution method for electronic price tag base stations of the present invention.

[0075] In this embodiment, the spatial distribution method of the electronic price tag base station includes the following steps:

[0076] Step S100: Obtain the base station's transmit power and receive sensitivity;

[0077] Specifically, the transmit power and receive sensitivity of the base station can be obtained by testing the base station.

[0078] Step S200: Calculate the distance between two adjacent base stations based on the transmit power and the receive sensitivity.

[0079] Specifically, the acquired transmit power and receive sensitivity are input into a preset formula for calculation, thereby calculating the distance between two adjacent base stations. The preset formula is:

[0080] ,in, The distance between two adjacent base stations; P 0 represents the transmission power of the base station; The receiving sensitivity of the base station is denoted as .

[0081] Step S300: Arrange the base stations in a matrix according to the distance between two adjacent base stations.

[0082] Furthermore, such as Figure 4 As shown, Figure 4 This is a flowchart illustrating one embodiment of the steps for calculating the distance between two adjacent base stations according to a preset formula. In this embodiment, the step of calculating the distance between two adjacent base stations according to the preset formula includes:

[0083] Step S210: Calculate the maximum distance between two adjacent base stations.

[0084] Specifically, such as Figure 5 As shown, Figure 5 for Figure 4 The flowchart illustrates an embodiment of the steps for calculating the maximum distance between two adjacent base stations. In this embodiment, the step of calculating the maximum distance between two adjacent base stations includes:

[0085] Step S211, according to the formula Calculate the radiation intensity, where, P(d) Radiation intensity; D is the signal path loss value; D is the distance.

[0086] Step S212, let And according to the formula Calculate the maximum distance between two adjacent base stations, where, The distance between two adjacent base stations; The receiving sensitivity of the base station is denoted as .

[0087] Step S220: Calculate the minimum distance between two adjacent base stations.

[0088] Specifically, such as Figure 6 As shown, Figure 6 for Figure 4 The flowchart shown is an embodiment of the steps for calculating the minimum distance between two adjacent base stations. In this embodiment, the steps for calculating the minimum distance between two adjacent base stations include:

[0089] Step S221: Set the channels of two adjacent base stations so that the channel spacing between the two adjacent base stations is greater than or equal to 2MHz.

[0090] Step S222: Calculate the minimum distance between two adjacent base stations based on the channel spacing between them.

[0091] Specifically, when the channel spacing between two adjacent base stations is greater than or equal to 2MHz and less than 3MHz, according to the formula... Calculate the minimum distance between two adjacent base stations.

[0092] When the channel spacing between two adjacent base stations is greater than or equal to 3MHz, according to the formula... Calculate the minimum distance between two adjacent base stations.

[0093] The specific ideas of this invention are as follows:

[0094] 1. Establish a radiation model

[0095] We define the base station's transmission power and the terminal price tag's transmission power as follows, simplifying the base station as a point source. During transmission, the base station signal travels through the air medium to the price tag terminal, during which the signal will suffer path loss. The formula for calculating free space signal loss is as follows:

[0096]

[0097] Where D represents the distance, in km. F Here, represents the signal transmission frequency, measured in MHz. Therefore, knowing the signal frequency and transmission distance, we can calculate a theoretical signal path loss. For example, when the signal operates in the 2.4 GHz band, the signal loss over 1 meter is approximately:

[0098]

[0099] Since the base station operates in the ISM band, the path loss difference between signals in the 2400MHz~2480MHz range is not significant over the same distance. Therefore, we simplify all signals within the band to 2400MHz signals. Thus, the above formula can be simplified to:

[0100]

[0101] Since the initial transmission power is The signal strength near the base station is The difference between the path loss and the radiation intensity of the base station is represented by the following formula:

[0102]

[0103] Therefore, we can simplify a base station as a point signal source. P 0 = 0 dBm. Using the above radiation formula, a two-dimensional radiation intensity map of the base station can be drawn (e.g., ...). Figure 7 (As shown).

[0104] 2. Rectangular division

[0105] From a two-dimensional perspective, let's assume the store is a rectangle. In reality, to avoid coverage dead spots and data update delays, the store wants the base station to cover the entire store as much as possible.

[0106] To achieve the above requirements and complete coverage of the entire space, a rectangular method is adopted for partitioning, meaning each base station occupies one rectangle, and the side length of each rectangle is [missing information]. That is, the distance between the two base stations is also The effective radiation range of each base station needs to exactly cover every small rectangle, so the radiation circle of the base station is the circumcircle of the rectangle (e.g., ...). Figure 8 As shown), geometric calculations yield the radiation radius. As can be seen from the above, r =D, then .

[0107] 3. Channel allocation

[0108] Before discussing channel allocation schemes, several prerequisites need to be known—the Bluetooth specification carrier-to-interference ratio (C / I) reference value, the number of available channels in the ISM band, and the channel bandwidth occupied by the base station during operation, etc.

[0109] First, there's the C / I reference value. In the BR receive characteristic table of Bluetooth specification V5.2, you can see that under co-channel interference, the effective carrier signal energy C and the interfering co-channel signal energy are specified. The ratio should be at least 11dB, meaning the carrier signal energy must be at least 11dB greater than the interference signal for the receiver to successfully demodulate a valid data signal. Similarly, for adjacent channel interference separated by 1MHz, the carrier signal energy should be at least as large as the interference signal, i.e., the ratio should be 0dB, for successful reception and demodulation. For adjacent channel interference separated by 2MHz and 3MHz, the ratios are -30dB and -40dB, respectively.

[0110] Next is the bandwidth occupied by the base station during operation. According to the actual spectrum analyzer measurement, the broadcast gateway occupies about 10MHz of spectrum bandwidth. Therefore, it is necessary to reserve 5MHz of bandwidth on both sides of the broadcast channel to avoid it.

[0111] Within the 2400MHz~2480MHz frequency band, channels are generally designated as integers, i.e., 2400, 2401...2480, for a total of 80 channels. Each base station occupies a certain bandwidth during operation, leading to co-channel or adjacent-channel interference between base stations. Describing the spatial distribution of base stations while ensuring reasonable channel allocation requires the following spatial partitioning and interference analysis.

[0112] 4. Interference Model

[0113] For interference analysis, we can consider only the overlap of the two base stations, whose radiated powers are P and P, respectively. a ( d ) and P b ( d When there is overlap, the following three critical points need to be considered (e.g. Figure 9 As shown in the figure, the distances between the three points can be calculated as follows: , ,as well as .

[0114] Interference between base stations can be analyzed according to the four cases in the Bluetooth C / I specification values. If any interference in any case does not conform to the specification, that condition can be discarded:

[0115] 1) Interference between base stations is co-channel interference.

[0116] The specification specifies Analysis shows that, At that point, the two base stations traveled the same distance, experienced the same fading, and reached the same signal strength. This does not conform to the specifications, and base station A and base station B interfere with each other, causing the signal to be unable to be received accurately. Therefore, co-channel interference is ruled out.

[0117] 2) Inter-base station interference between adjacent channels with a 1MHz gap

[0118] The specification specifies , in greater than The signal at that location has If the C / I value is less than 0dB, the interference is also non-compliant, and the receiver cannot extract the useful signal from the interfered signal, thus eliminating the 1MHz adjacent channel interference scenario.

[0119] 3) Inter-base station interference between adjacent channels with a 2MHz gap

[0120] The specification specifies Considering the worst-case scenario, that is... At this point, the signal from base station a is weakest, while the interference from base station b is strongest. As long as at this point... This ensures that C / I conforms to the specification at the overlap. Therefore, let Find the range that satisfies this formula. , which is the constraint condition under the condition.

[0121] 4) Interference between base stations caused by adjacent channels with a spacing of 3MHz or more

[0122] Similarly, the specification states As long as Find the range that satisfies this formula. , which refers to the constraints under the given conditions.

[0123] Allocation algorithm formula

[0124] After analyzing the above situations, we still need one last parameter: receiver sensitivity. Sensitivity can be interpreted as the minimum power that the receiver can accept within the error range.

[0125] Next, we can begin the analysis. In fact, we can obtain the initial power of the base station in advance through testing. P 0 and receiver sensitivity After obtaining these two parameters, in order to comply with the specifications, we will use the C / I specification value as a constraint to obtain our final allocation scheme.

[0126] First, after obtaining the base station radiation formula model, we can obtain the maximum rectangular division side length by setting the power at the effective radiation edge to be exactly equal to the sensitivity, which is the maximum limit value. ,when season

[0127] ,have to: Solving for: .

[0128] For constraints We must make ,in Therefore, we can solve the inequalities. Solving for: .

[0129] For constraints We must make ,in Therefore, we can solve the inequalities. Solving for .

[0130] In summary, our channel allocation and spatial partitioning scheme can be summarized as follows:

[0131] First, in order to avoid co-channel or adjacent-channel interference caused by the proximity of the working channels, we need to avoid co-channel and adjacent-channel interference separated by 1MHz.

[0132] Secondly, we need to make the most of the limited space, improve space utilization, and maximize the working efficiency of base stations. The distribution scheme of base stations needs to be based on the principle of interference control, ensuring that the working channel spacing between base stations is ≥2MHz and conforms to the C / I specification, while also ensuring that the effective radiation range of the base stations can cover the effective space to the greatest extent. Based on the above analysis, we obtain the following distribution scheme:

[0133]

[0134] In real-world scenarios, when the base station's initial transmit power... P 0 = 0dBm, receiver sensitivity At that time, we obtained 3.41m≤ The distance between base stations should be ≤44.72m. However, due to interference and space utilization considerations, we will choose a distance close to the maximum value as our base station distribution scheme. Therefore, under this condition, our optimized distribution scheme is to keep the distance between base stations at approximately 44.72m, which allows for the most efficient use of limited space while ensuring that interference meets the reference value.

[0135] The technical solution of this invention calculates the distance between two adjacent base stations by measuring the transmission power and the receiving sensitivity, and arranges the base stations in a matrix according to the distance between the two adjacent base stations, thereby optimizing the spatial layout of the base stations. While achieving effective spatial coverage, it effectively reduces mutual interference between base stations and improves the working efficiency of the base stations.

[0136] This invention also proposes a terminal, including a memory, a processor, and an implementation program for a spatial distribution method of an electronic price tag base station stored in the memory and executable on the processor. When executed by the processor, the implementation program for the spatial distribution method of the electronic price tag base station implements all the steps in the embodiments of the above-described spatial distribution method of the electronic price tag base station. Since the terminal can execute all the steps in any of the above embodiments, this mobile terminal at least has all the beneficial effects brought about by the technical solutions of the above-described method embodiments, which will not be elaborated further here.

[0137] This invention also proposes a computer-readable medium storing an implementation program for a spatial distribution method of electronic price tag base stations. When executed, the implementation program can perform all the steps in any of the above embodiments. Since the computer-readable medium can execute all the steps in any of the above embodiments, this computer-readable medium possesses at least all the beneficial effects brought about by the technical solutions of the above method embodiments, which will not be elaborated further here.

[0138] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0139] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0140] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0141] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A method for spatial distribution of electronic price tag base stations, characterized in that, Includes the following steps: Obtain the base station's transmit power and receive sensitivity; Calculate the distance between two adjacent base stations based on the transmit power and the receive sensitivity; The base stations are arranged in a matrix according to the distance between two adjacent base stations; in, According to the formula Calculate the radiation intensity, where, P ( d () represents radiation intensity. P 0 represents the transmission power of the base station. Where D is the signal path loss value, and D is the distance; make And according to the formula Calculate the maximum distance between two adjacent base stations, where, The distance between two adjacent base stations; The receiving sensitivity of the base station; Configure the channels of two adjacent base stations so that the channel spacing between the two adjacent base stations is greater than or equal to 2MHz; When the channel spacing between two adjacent base stations is greater than or equal to 2MHz and less than 3MHz, according to the formula... Calculate the minimum distance between two adjacent base stations; When the channel spacing between two adjacent base stations is greater than or equal to 3MHz, according to the formula Calculate the minimum distance between two adjacent base stations.

2. A terminal, characterized in that, The system includes a memory, a processor, and an implementation program for a spatial distribution method of electronic price tag base stations stored in the memory and executable on the processor. When the implementation program for the spatial distribution method of electronic price tag base stations is executed by the processor, it implements the steps of the spatial distribution method of electronic price tag base stations as described in claim 1.

3. A computer-readable medium, characterized in that, The computer-readable medium stores an implementation program for a spatial distribution method of electronic price tag base stations. When the implementation program for the spatial distribution method of electronic price tag base stations is executed, it implements the steps of the spatial distribution method of electronic price tag base stations as described in claim 1.

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