JP6907482B2 - Communication terminals, control devices, communication methods, control methods, and programs - Google Patents

Description

The present invention relates to communication terminals, control devices, communication methods, control methods, and programs.

In recent years, with the progress of communication technology, miniaturization of various devices, and the spread of communication infrastructure for wireless communication such as base stations, it has been configured to be portable by users like mobile phones and smartphones. Wireless communication terminals (hereinafter, also referred to as "portable wireless terminals") have become widespread.

JP-A-2010-68529

On the other hand, as a portable wireless terminal as described above, a worker who performs maintenance work and management work of a facility (for example, a base station tower) in which an operating wireless base station antenna is installed is contacted even during the work. There is a need to provide a portable wireless terminal that can be used for this purpose. However, in a situation where a worker climbs a base station tower while holding a portable wireless terminal to perform work, a high-power wireless signal (radio wave) is emitted from the base station antenna. The dynamic range of the receiving circuit of the type wireless terminal may be exceeded, and the receiving circuit may be damaged.

On the other hand, for example, Patent Document 1 discloses an example of a mechanism for protecting a predetermined receiving circuit when a high-power radio signal is received. However, there is a need for a mechanism to more accurately determine the situation in which a worker is climbing a base station tower and working, and to more reliably protect the receiving circuit of the portable wireless terminal held by the worker. ing.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to determine a situation in which a high-power radio signal is received in a more preferable manner to obtain a receiving circuit. The purpose is to provide a mechanism that can be protected.

In order to solve the above problems, according to a certain viewpoint of the present invention, a communication unit that transmits / receives radio waves, an altitude information acquisition unit that acquires altitude information indicating the altitude of the own terminal, and another terminal different from the own terminal. The altitude difference calculation unit that acquires the altitude information of the other terminal from the above and calculates the altitude difference between the own terminal and the other terminal based on the altitude information of the own terminal and the other terminal, and the above. Based on the power detection unit that detects the first power value of the first received signal based on the reception result of the radio wave and the first power value, it is determined whether or not the own terminal is located near the base station. When both the altitude difference and the first power value are equal to or greater than the threshold value, the position determination unit determines that the own terminal is in a high place, and the own terminal is the base station. A control unit that controls the reception gain of the first received signal when it is determined that the terminal is located in the vicinity and the own terminal is determined to be in a high place, and the control unit in which the reception gain is controlled. The position determination unit includes a reception signal strength detection unit that detects a second power value of the first reception signal, and the position determination unit uses the first power value detected by the power detection unit as the reception signal strength. Provided is a communication terminal that determines that the own terminal is located near the base station when showing a value near the upper limit of the dynamic range of the detection unit.

The position determination unit may acquire position information indicating the position of the own terminal and determine whether or not the own terminal is located in the vicinity of the base station based on the acquired position information.

The position information indicating the position of the own terminal may be information based on the detection result of the position coordinates of the own terminal.

The altitude difference calculation unit acquires position information indicating the positions of the own terminal and the other terminal, and based on the acquired position information, both the own terminal and the other terminal are located within a predetermined range. In this case, the altitude difference between the own terminal and the other terminal may be calculated.

The altitude difference calculation unit acquires position information indicating the positions of the own terminal and the other terminal, and based on the acquired position information, the other is predetermined with respect to one of the own terminal and the other terminal. When it is located within the range of, the altitude difference between the own terminal and the other terminal may be calculated.

The location information of the other terminal may be information based on the detection result of the power value of the second reception signal received at the other terminal.

The position information of the other terminal may be information based on the detection result of the position coordinates of the other terminal.

An amplification unit that amplifies the first received signal, is connected to the communication unit, has a first terminal and a second terminal, and the first terminal is connected to the amplification unit to form the second terminal. The terminal may include a switching unit connected to a bypass path that bypasses the amplification unit, and the control unit may control the reception gain of the first received signal by switching the switching unit. ..

Further, in order to solve the above problems, according to another viewpoint of the present invention, the first communication terminal calculated based on altitude information indicating the altitude of each of the first communication terminal and the second communication terminal for transmitting and receiving radio waves. Whether or not both the altitude difference between the communication terminal and the second communication terminal and the detection result of the power value of the received signal based on the reception result of the radio wave by the first communication terminal are equal to or higher than the threshold value. The acquisition unit that acquires a determination result indicating whether or not the first communication terminal is in a high place based on the above, and the first communication terminal is located near the base station based on the power value of the received signal. Then, when it is determined that the first communication terminal is located at a high place, a control device including a control unit for controlling the reception gain of the first communication terminal is provided. NS.

Further, in order to solve the above problems, according to another viewpoint of the present invention, the computer transmits and receives radio waves and acquires altitude information indicating the altitude of the own terminal, which is different from the own terminal. Acquiring the altitude information of the other terminal from another terminal, calculating the altitude difference between the own terminal and the other terminal based on the altitude information of the own terminal and the other terminal, and the radio wave. Detecting the first power value of the first received signal based on the reception result of the above, and determining whether or not the own terminal is located in the vicinity of the base station based on the first power value. When both the altitude difference and the first power value are equal to or higher than the threshold value, it is determined that the own terminal is in a high place and that the own terminal is located in the vicinity of the base station. In addition, when it is determined that the own terminal is in a high place, the reception gain of the first reception signal is controlled, and the second reception signal of the first reception signal whose reception gain is controlled is controlled. when viewed contains and detecting a power value, a, of the first power value indicates the value of the upper limit vicinity of the dynamic range of the received signal strength detection unit which detects the second power value, the own terminal Provided is a communication method in which is determined to be located in the vicinity of the base station.

Further, in order to solve the above problem, according to another viewpoint of the present invention, the computer is calculated based on the altitude information indicating the altitude of each of the first communication terminal and the second communication terminal for transmitting and receiving radio waves. Both the altitude difference between the first communication terminal and the second communication terminal and the detection result of the power value of the received signal based on the reception result of the radio wave by the first communication terminal are equal to or higher than the threshold value. based on whether the first communication terminal with Turkey to obtain a determination result indicating whether the altitude, on the basis of the power value of the received signal first communication terminal base station A control method including controlling the reception gain of the first communication terminal when it is determined that the first communication terminal is located in the vicinity of the first communication terminal and when it is determined that the first communication terminal is located at a high place. Is provided.

Further, in order to solve the above problems, according to another viewpoint of the present invention, transmitting and receiving radio waves to and from a computer and acquiring altitude information indicating the altitude of the own terminal are different from the own terminal. Acquiring the altitude information of the other terminal from another terminal, calculating the altitude difference between the own terminal and the other terminal based on the altitude information of the own terminal and the other terminal, and the radio wave. Detecting the first power value of the first received signal based on the reception result of the above, and determining whether or not the own terminal is located in the vicinity of the base station based on the first power value. When both the altitude difference and the first power value are equal to or higher than the threshold value, it is determined that the own terminal is in a high place and that the own terminal is located in the vicinity of the base station. In addition, when it is determined that the own terminal is in a high place, the reception gain of the first reception signal is controlled, and the second reception signal of the first reception signal whose reception gain is controlled is controlled. A program that detects and executes a power value, and the first power value indicates a value near the upper limit of the dynamic range of the received signal strength detection unit that detects the second power value. Provided is a program in which it is determined that the own terminal is located in the vicinity of the base station.

Further, in order to solve the above problems, according to another viewpoint of the present invention, it is calculated based on altitude information indicating the altitudes of the first communication terminal and the second communication terminal that transmit and receive radio waves to the computer. Both the altitude difference between the first communication terminal and the second communication terminal and the detection result of the power value of the received signal based on the reception result of the radio wave by the first communication terminal are equal to or higher than the threshold value. based on whether the first communication terminal with Turkey to obtain a determination result indicating whether the altitude, on the basis of the power value of the received signal first communication terminal base station When it is determined that the first communication terminal is located in the vicinity of, and when it is determined that the first communication terminal is located at a high place, a program for controlling the reception gain of the first communication terminal is executed. Is provided.

As described above, according to the present invention, there is provided a mechanism capable of discriminating a situation in which a high-power radio signal is received in a more preferable manner and protecting the receiving circuit.

It is explanatory drawing for demonstrating the outline of the communication terminal which concerns on one Embodiment of this disclosure. This is an example of the hardware configuration of the communication terminal according to the same embodiment. It is a block diagram which showed an example of the functional structure of the communication terminal which concerns on this embodiment. It is a flowchart which showed an example of the processing flow of the example of the communication terminal which concerns on this embodiment.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present specification and the drawings, components having substantially the same functional configuration are designated by the same reference numerals, so that duplicate description will be omitted.

<1. Overview>
First, with reference to FIG. 1, an example of an environment to which the communication terminal according to the embodiment of the present disclosure is applied will be described, and then the technical problems of the communication terminal according to the present embodiment will be summarized. FIG. 1 is an explanatory diagram for explaining an outline of a communication terminal according to the present embodiment.

In FIG. 1, reference numeral 500a indicates a facility in which the radio base station antenna 300 is installed (hereinafter, also referred to as “base station steel tower”). Further, reference numeral 500b indicates another steel tower in which the radio base station antenna 300 is not installed. Further, reference numerals 100a to 100f schematically indicate communication terminals configured to be able to communicate with the base station via wireless communication. Examples of such a communication terminal include a portable wireless communication terminal (that is, a portable wireless terminal) such as a so-called smartphone or tablet terminal, as shown by reference numerals 100a to 100e. Further, as another example, the communication terminal is configured as an on-board unit including a wireless device configured to be able to communicate with a base station or another wireless communication terminal via wireless communication, as shown by reference numeral 100f. You may be. In the following description, when the communication terminals 100a to 100f are not particularly distinguished, they may be simply referred to as "communication terminal 100".

As shown in FIG. 1, in a base station tower 500a in which an operating wireless base station antenna 300 is installed, a case where a worker holding a communication terminal 100 (for example, a portable wireless terminal) performs maintenance work or a base It is possible that the station administrator will perform the management work. At that time, the worker may hold the communication terminal 100 for communication and climb the base station tower 500a to perform the work. In such a case, since a high-power radio signal (radio wave) is emitted from the radio base station antenna 300, the dynamic range of the receiving circuit of the communication terminal 100 may be exceeded, and the receiving circuit may be damaged. be.

That is, when a higher power than expected is input to the receiving circuit, in the receiving circuit of a general wireless communication terminal, the receiving circuit is damaged, or even if it can be received, the AGC (Automatic Gain Control) converges. It takes time to demodulate, and it may not be possible to demodulate the first packet received correctly. In many cases, the receiving circuit waits for reception with the AGC at the maximum gain so that the signal with the minimum received power can be demodulated. Therefore, in such a receiving circuit, when a power larger than the minimum received power is detected, the signal level of the received signal is adjusted by using AGC or the like, and the received power is detected again to control the AGC. , Repeat until the receivable signal level is reached. Therefore, in the case of such a control method, when a relatively high power radio signal (radio wave) is received, the signal level of the received signal is relatively adjusted to a level at which the received signal can be demodulated. It will take a long time.

In view of such a situation, the communication terminal 100 according to the present embodiment determines a situation in which a user (for example, a worker) holding the communication terminal 100 is climbing a base station tower 500a in which a wireless base station antenna 300 is installed. However, a mechanism is provided that protects the receiving circuit and makes it possible to demodulate the received signal according to the discrimination result. Therefore, the communication terminal according to the present embodiment will be described in more detail below.

<2. Hardware configuration>
Subsequently, with reference to FIG. 2, an example of the hardware configuration of the communication terminal according to the present embodiment will be described with particular attention to the configuration of the receiving unit. FIG. 2 is an example of the hardware configuration of the communication terminal according to the present embodiment.

As shown in FIG. 2, the communication terminal 100 according to the present embodiment includes an antenna element 101, a transmission / reception changeover switch 103, a high power detection unit 105, RF switches 107a and 107b, and a high frequency amplifier (LNA: Low Noise Amplifier). ) 111, RSSI detection unit 131, reception amplifier 113, bandpass filter 115, mixer 117, AGC unit 119, comparator 133, altitude difference detection unit 140, AND gate 135, and communication control unit 127. And include. Further, the AGC unit 119 includes a variable gain amplifier (VGA: Variable Gain Amplifier) 121, a low-pass filter 123, and an AD converter 125. Further, the altitude difference detection unit 140 includes an altitude sensor 141 and an altitude difference calculation unit 143.

The antenna element 101 is configured to be able to transmit and receive wireless signals (radio waves) in a desired band, and is connected to the antenna port of the transmission / reception changeover switch 103.

The transmission / reception changeover switch 103 includes an antenna port, a transmission port, and a reception port, and is configured so that the port electrically connected to the antenna port can be selectively switched between the transmission port and the reception port. .. A series of configurations corresponding to a transmission unit are connected to the transmission port of the transmission / reception changeover switch 103. As a specific example, a PA (Power Amplifier) is connected to the transmission port, and a transmission signal amplified by the PA is input. That is, at the time of transmission, the antenna port and the transmission port are electrically connected, and the transmission signal is supplied to the antenna element 101. As a result, the transmitted signal is radiated into space from the antenna element 101 as a radio signal (radio wave). In FIG. 2, the detailed configuration of the transmission unit is not shown.

Further, a series of configurations corresponding to the receiving unit are connected to the receiving port of the transmission / reception changeover switch 103. Specifically, the receiving port is connected to the input side of the high power detection unit 105. Further, one terminal of the RF switch 107a is connected to the output side of the high power detection unit 105. That is, at the time of reception, the antenna port and the reception port are electrically connected. As a result, the spatial radio signal (radio wave) is converted into a received signal by the antenna element 101, and the received signal is supplied to one terminal of the RF switch 107a via the high power detection unit 105.

Further, the high power detection unit 105 detects the power value of the input received signal and outputs information indicating the detection result of the power value to the comparator 133.

The comparator 133 acquires information indicating the detection result of the power value of the received signal from the high power detection unit 105, and compares the acquired information with a predetermined threshold value. Then, the comparator 133 supplies a predetermined control signal to the one-step cloud input terminal of the AND gate 135 when the power value of the received signal is equal to or higher than the threshold value.

The altitude sensor 141 is connected to the altitude difference calculation unit 143. That is, the altitude sensor 141 detects the altitude and outputs altitude information based on the detection result to the altitude difference calculation unit 143.

The altitude difference calculation unit 143 may be composed of, for example, a DSP (Digital Signal Processor), an FPGA (Field-Programmable Gate Array), a microcomputer, or the like. The altitude difference calculation unit 143 calculates the altitude difference between its own terminal (that is, the communication terminal 100 provided with the altitude difference calculation unit 143) and another terminal (that is, the external communication terminal 100). The altitude difference calculation unit 143 acquires altitude information indicating the altitude of the own terminal from the altitude sensor 141, and the altitude difference calculation unit 143 acquires altitude information indicating the altitude of the other terminal from the other terminal. Then, the altitude difference calculation unit 143 calculates the altitude difference between the own terminal and the other terminal based on the acquired altitude information of the own terminal and the other terminal. The altitude difference calculation unit 143 supplies a control signal based on the calculation result of the altitude difference between the own terminal and another terminal to the other input terminal of the AND gate 135.

In the AND gate 135, one input terminal is connected to the comparator 133, and the other input terminal is connected to the altitude difference calculation unit 143. Further, the output terminal of the AND gate 135 is connected to the communication control unit 127. That is, the AND gate 135 supplies the control signal to the communication control unit 127 according to the calculation result based on the control signal supplied from each of the comparator 133 and the altitude difference calculation unit 143. As a more specific example, when the power value of the received signal by the high power detection unit 105 is equal to or higher than the threshold value and the altitude difference calculation result by the altitude difference calculation unit 143 is equal to or higher than the threshold value, communication control is performed from the AND gate 135. A predetermined control signal is supplied to the unit 127.

In the RF switch 107a, the connection destination of the terminal to which the output side of the high power detection unit 105 is connected is connected to the terminal connected to the input side of the high frequency amplifier 111 and the terminal connected to the bypass path 109 bypassing the high frequency amplifier 111. Selectively switch between. Further, one terminal of the RF switch 107b is connected to the receiving circuit in the subsequent stage, and the connection destination of the terminal is a terminal connected to the output side of the high frequency amplifier 111 and a terminal connected to the bypass path 109. Selectively switch between. The RF switches 107a and 107b are switched so as to be interlocked with each other by the communication control unit 127 described later. Based on such a configuration, the RF switches 107a and 107b are switched so that the received signal output from the high power detection unit 105 passes through either the path to which the high frequency amplifier 111 is connected or the bypass path 109. Is supplied to the receiving circuit in the subsequent stage. This makes it possible to selectively control the reception gain of the received signal, that is, whether or not to attenuate the power of the received signal.

The high frequency amplifier 111 amplifies and outputs the power value (signal level) of the input signal (that is, the received signal). By providing the high frequency amplifier 111, for example, the received signal based on the reception result of the radio signal (radio wave) attenuated due to the propagation of the radio propagation path is amplified so as to be able to be decoded in a more preferable manner. It becomes possible.

The received signal transmitted via either the path to which the high-frequency amplifier 111 is connected or the bypass path 109 is demultiplexed by, for example, a splitter or the like, and a series of receiving circuits located in the subsequent stage (that is, the receiving amplifier 113). , Bandpass filter 115, mixer 117, and AGC unit 119), and RSSI detection unit 131, respectively.

The RSSI detection unit 131 detects the power value (signal level) of the received signal whose reception gain is controlled by switching the RF switches 107a and 107b, and sends a control signal based on the detection result of the power value to the communication control unit 127. Supply.

The received signal input to the receiving circuit side is amplified by the receiving amplifier 113, and then the signal component of a predetermined frequency band is supplied to the mixer 117 via the bandpass filter 115. Then, the received signal is down-converted from the RF (Radio Frequency) band signal to the BB (Base Band) band signal by the mixer 117, and is supplied to the AGC unit 119.

The AGC unit 119 controls the power value of the received signal to be at a predetermined level regardless of the magnitude of the power value (signal level) of the input received signal, and controls the analog received signal to be a digital signal. Convert to. Specifically, as shown in FIG. 2, the received signal input to the AGC unit 119 is first controlled by the variable gain amplifier 121 so that the power value becomes a predetermined level. The gain of the variable gain amplifier 121 is controlled by the communication control unit 127 based on the detection result of the power value of the received signal by the RSSI detection unit 131. The received signal whose power value is controlled by the variable gain amplifier 121 has a high frequency component cut off by passing through the low-pass filter 123, and a signal component in a predetermined frequency band is supplied to the AD converter 125. Then, the AD converter 125 converts the input analog reception signal into a digital signal, and then supplies the digital reception signal to the communication control unit 127.

The communication control unit 127 may be composed of, for example, a DSP, an FPGA, a microcomputer, or the like. The communication control unit 127 generates a transmission signal and decodes the reception signal supplied from the AGC unit 119. Further, the communication control unit 127 receives the supply of the control signal based on the detection result of the power value of the received signal from the RSSI detection unit 131, and controls the gain of the variable gain amplifier 121 based on the detection result.

Further, the communication control unit 127 switches between RF switches 107a and 107b based on the control signal supplied from the AND gate 135. As a specific example, the communication control unit 127 switches each of the RF switches 107a and 107b to the bypass path 109 side when a control signal is supplied from the AND gate 135. As a result, when the detection result of the power value by the high power detection unit 105 is equal to or higher than the threshold value and the calculation result of the altitude difference by the altitude difference calculation unit 143 is equal to or higher than the threshold value, the reception output from the high power detection unit 105 is performed. The signal is fed to the bypass path 109 (ie, the high frequency amplifier 111 is bypassed).

The hardware configuration of the communication terminal 100 according to the present embodiment described above is only an example, and is not necessarily limited to the example described above. As a specific example, in the above description, the case where the receiving circuit is configured as a direct conversion type circuit has been described as an example, but the receiving circuit may be configured as a heterodyne type circuit. Further, the series of configurations described above may be configured by one chip by an IC or the like, or a part of the configurations may be configured as another chip. As a more specific example, the communication control unit 127 and other configurations may be provided on separate chips. In this case, the chip provided with the communication control unit 127 corresponds to an example of the “control device”. Further, if the series of operations described above can be realized, a part of the configurations described above may be externally attached to the outside of the communication terminal 100.

As described above, an example of the hardware configuration of the communication terminal according to the present embodiment has been described with reference to FIG. 2, paying particular attention to the configuration of the receiving unit.

<3. Functional configuration>
Subsequently, an example of the functional configuration of the communication terminal according to the present embodiment will be described with reference to FIG. FIG. 3 is a block diagram showing an example of the functional configuration of the communication terminal according to the present embodiment. As shown in FIG.

As shown in FIG. 3, the communication terminal 100 according to the present embodiment includes an antenna element 101, a wireless communication unit 151, an altitude information acquisition unit 153, a power detection unit 155, a storage unit 157, and a control unit 160. including. The antenna element 101 corresponds to the antenna element 101 shown in FIG.

The wireless communication unit 151 is configured to transmit and receive signals. For example, the wireless communication unit 151 receives a signal (downlink signal) transmitted from a base station and transmits a signal (uplink signal) to the base station.

The altitude information acquisition unit 153 corresponds to the altitude sensor 141 shown in FIG. The altitude information acquisition unit 153 detects the altitude and outputs information indicating the detection result of the altitude to the control unit 160.

The power detection unit 155 is configured to detect the power value of the received signal, and corresponds to, for example, the high power detection unit 105 and the RSSI detection unit 131 shown in FIG. The power detection unit 155 detects the power value of the input received signal, and outputs information indicating the detection result of the power value to the control unit 160.

The storage unit 157 temporarily or permanently stores the program for the operation of the communication terminal 100 and various data. The storage unit 157 may be composed of, for example, a magnetic storage unit device such as an HDD (Hard Disk Drive), a semiconductor storage device, an optical storage device, a magneto-optical storage device, or the like.

The control unit 160 is configured to control a series of operations of the communication terminal 100, and may be configured by, for example, a CPU, a DSP, an FPGA, a microcomputer, or the like. Specifically, as shown in FIG. 3, the control unit 160 includes a communication control unit 161, an altitude difference calculation unit 163, a position determination unit 165, and an altitude determination unit 167.

The altitude difference calculation unit 163 may correspond to the altitude difference calculation unit 143 described above with reference to FIG. 2, for example. In this case, the altitude difference calculation unit 163 sets the altitude of the own terminal and the other terminal based on the altitude information indicating the altitude of the own terminal (that is, the communication terminal 100) and the altitude information indicating the altitude of the other terminal. Calculate the altitude difference between them. As a more specific example, the altitude difference calculation unit 163 uses cluster analysis that combines the altitude information of the own terminal and the altitude information of one or more other terminals to determine that the own terminal has an altitude with respect to the other terminal. Determine if it is located. Then, when the altitude difference calculation unit 163 determines that the own terminal is located at a certain point with respect to at least some other terminals, the altitude difference calculation unit 163 determines that the altitude between the own terminal and the other terminal is high. The difference may be calculated. By calculating the altitude difference as described above, it is possible to determine whether or not the own terminal is located at a high place based on the altitude difference.

Further, as another example, the altitude difference calculation unit 163 may calculate the altitude difference between the own terminal (that is, the communication terminal 100) and the ground. More specifically, the altitude difference calculation unit 163 acquires the measurement result of the position coordinates of its own terminal by GPS (Global Positioning System), and collates the position coordinates with map information or the like to indicate the position coordinates. Identify the elevation of the position. Then, the altitude difference calculation unit 163 may calculate the altitude difference between the own terminal and the ground by comparing the specified altitude with the altitude information indicating the altitude of the own terminal. By calculating the altitude difference as described above, it is possible to determine whether or not the own terminal is located at a high place based on the altitude difference.

The altitude difference calculation unit 163 is used when both the own terminal (that is, the communication terminal 100) and the other terminal are located within a predetermined range (for example, when they are located in a region near the base station tower 500A). , The altitude difference between the own terminal and the other terminal may be calculated.

Further, as another example, the altitude difference calculation unit 163 can be used between the own terminal and the other terminal according to the relative positional relationship between the own terminal (that is, the communication terminal 100) and the other terminal. The altitude difference may be calculated. As a specific example, the altitude difference calculation unit 163 determines the altitude difference between the own terminal and the other terminal when the other is located within a predetermined range with respect to one of the own terminal and the other terminal. May be calculated.

The position determination unit 165 determines whether or not the own terminal (that is, the communication terminal 100) is located in the vicinity of the base station. As a specific example, in the position determination unit 165, the detection result of the power value of the received signal by the power detection unit 155 is a value near the upper limit of the dynamic range of the predetermined device (for example, the RSSI detection unit 131 shown in FIG. 2). Is indicated, it is determined that the own terminal is located in the vicinity of the base station. Further, as another example, the position determination unit 165 acquires the measurement result of the position coordinates of the own terminal by GPS and collates the position coordinates with the map information or the like so that the own terminal is located near the base station. It may be determined whether or not.

The height determination unit 167 determines whether or not the own terminal (that is, the communication terminal 100) is located at a so-called high place such as the upper part of a steel tower in which an antenna of a base station or the like is installed. Specifically, in the height determination unit 167, the altitude difference calculated by the altitude difference calculation unit 163 is equal to or greater than a predetermined threshold value, and the power value of the received signal detected by the power detection unit 155 is a predetermined threshold value. In the above case, it is determined that the own terminal is located at the above-mentioned high place (that is, the upper part of the steel tower where the antenna of the base station or the like is installed).

The communication control unit 161 performs demodulation processing on the signal from the base station (that is, the received signal) received by the wireless communication unit 151 based on a predetermined communication method, so that the data transmitted from the base station can be obtained. Demodulate. Further, the communication control unit 161 generates a transmission signal by performing modulation processing on the data to be transmitted based on a predetermined communication method, and the generated transmission signal is transmitted from the wireless communication unit 151 to the base station. It may be controlled as follows.

Further, the communication control unit 161 may control various operations of the wireless communication unit 151. As a specific example, the communication control unit 161 may control the VGA gain of the portion corresponding to the reception unit of the wireless communication unit 151 based on the detection result of the power value of the received signal by the power detection unit 155. .. Further, when the communication control unit 161 determines that the own terminal is located at the above-mentioned high place by the high place determination unit 167, the communication control unit 161 is a part of the wireless communication unit 151 that corresponds to the receiving unit (for example,). , Various switches may be controlled so that the high frequency amplifier 111) shown in FIG. 2 is bypassed.

As described above, an example of the functional configuration of the communication terminal according to the present embodiment has been described with reference to FIG.

<4. Processing>
Subsequently, an example of a series of processing flows of the communication terminal according to the present embodiment will be described with reference to FIG. FIG. 4 is a flowchart showing an example of the processing flow of an example of the communication terminal according to the present embodiment.

As shown in FIG. 4, the communication terminal 100 detects the power value of the received signal, and when the detection result indicates a value near the upper limit of the dynamic range of the RSSI detection unit 131, the own terminal is located near the base station. (For example, it is determined that it is close to the base station tower 500a) (S101).

For example, when the communication terminal 100 determines that the own terminal is located near the base station (S101, YES), the communication terminal 100 detects the altitude of the own terminal by a predetermined detection device such as an altitude sensor (S103). .. At this time, the communication terminal 100 may detect the altitude of its own terminal in a predetermined cycle (more preferably, a cycle faster than the speed at which the altitude changes when the worker climbs the steel tower).

Next, the communication terminal 100 transmits altitude information based on the altitude detection result of the own terminal (hereinafter, also referred to as "altitude information of the own terminal") to another terminal, and the altitude information about the altitude of the other terminal is transmitted from the other terminal. (Hereinafter, also referred to as "altitude information of another terminal") is acquired (S105). Then, the communication terminal 100 detects (or or detects) the altitude difference between the own terminal and the other terminal by analyzing the altitude information of the own terminal in combination with the altitude information of the other terminal acquired from the other terminal. Calculate) (S109). As a specific example, the communication terminal 100 is a terminal (that is, the own terminal and another terminal) to be analyzed based on the parameter of altitude by cluster analysis based on the altitude information of the own terminal and the altitude information of the other terminal. Is classified, and the altitude difference between the own terminal and another terminal is detected (or calculated) based on the classification result. As a result, the communication terminal 100 can determine whether or not its own terminal is located at a certain altitude as compared with other terminals (in other words, whether or not it is located at a high place).

When the altitude difference between the own terminal and the other terminal is detected (S109, YES), the communication terminal 100 confirms whether or not the high power detection unit 105 has detected high power (S111). When the high power detection unit 105 detects high power (S111, YES), the communication terminal 100 causes the received signal to pass through the bypass path 109 (that is, the high frequency amplifier 111 is bypassed). Each of the RF switches 107a and 107b is switched to the bypass path 109 side (S113). By such control, the received signal is supplied to the receiving amplifier 113 via the bypass path 109, amplified by the receiving amplifier 113, and then supplied to the AGC unit 119 via the bandpass filter 115 and the mixer 117.

Then, the received signal supplied to the AGC unit 119 is controlled by the AGC unit 119 so that the power value becomes a predetermined level (S115), converted from an analog signal to a digital signal, and then decoded.

On the other hand, when the own terminal is not located near the base station (S101, NO), the communication terminal 100 does not execute the series of processes indicated by the reference numerals S103 to S113. Further, when the communication terminal 100 cannot detect the altitude difference between the own terminal and the other terminal, for example, when the altitude information cannot be acquired from the other terminal (S109, NO), The processing indicated by reference numerals S111 and S113 is not executed. Similarly, when the high power detection unit 105 does not detect high power (S111, YES), the communication terminal 100 does not execute the process indicated by the reference code S113. In these cases, the RF switches 107a and 107b are not switched to the bypass path 109 side, respectively. Therefore, the received signal is supplied to the receiving amplifier 113 via the high frequency amplifier 111, amplified by the receiving amplifier 113, and then supplied to the AGC unit 119 via the bandpass filter 115 and the mixer 117.

As described above, an example of a series of processing flows of the communication terminal according to the present embodiment has been described with reference to FIG.

<5. Conclusion>
As described above, the communication terminal 100 according to the present embodiment calculates the altitude difference between the own terminal and the other terminal based on the altitude information indicating the altitude of the own terminal and the other terminal. Further, the communication terminal 100 detects the power value of the received signal based on the reception result of the radio wave. Then, when the own terminal is located near the base station, the communication terminal 100 controls the reception gain of the received signal based on the calculated altitude difference and the detected power value. More specifically, when both the calculated altitude difference and the detected power value are equal to or higher than the threshold value, the communication terminal 100 determines that the own terminal is in a high place, and is like a high frequency amplifier (LNA) or the like. The reception gain is controlled by bypassing at least some of the devices that make up the reception circuit.

With such a configuration, the communication terminal 100 according to the present embodiment more reliably determines a situation in which a user (for example, a worker) holding itself is climbing the base station tower 500a, and responds to the determination result. Therefore, it is possible to protect the receiving circuit and demodulate the received signal.

More specifically, in a general communication terminal, a radio signal (radio wave) is attenuated by propagating in the radio propagation path, so that the received signal is amplified by amplifying the received signal by a radio frequency amplifier (LNA). The demodulation can be performed in a more preferable manner. On the other hand, in the vicinity of the radio base station antenna 300, since the amount of attenuation of the radio signal due to the propagation of the radio propagation path is small, a signal having a power value that does not need to be amplified by a high frequency amplifier (LNA) is received. .. Even under such a situation, according to the communication terminal according to the present embodiment, the high frequency amplifier (LNA) is bypassed, so that the high frequency amplifier can achieve both protection and demodulation of the received signal. Become.

Although the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, the present invention is not limited to such examples. It is clear that a person having ordinary knowledge in the field of technology to which the present invention belongs can come up with various modifications or modifications within the scope of the technical ideas described in the claims. , These are also naturally understood to belong to the technical scope of the present invention.

For example, in the above embodiment, an example of bypassing the high frequency amplifier (LNA) as a protection target has been described, but it goes without saying that the device to be protected is not necessarily limited to the high frequency amplifier (LNA).

100 Communication terminal 101 Antenna element 103 Transmission / reception selector switch 105 High power detector 107a, 107b RF switch 109 Bypass path 111 High frequency amplifier 113 Reception amplifier 115 Bandpass filter 117 Mixer 119 AGC section 121 Variable gain amplifier 123 Bandpass filter 125 AD converter 127 Communication control unit 131 RSSI detection unit 133 Comparator 135 AND Gate 140 Altitude difference detection unit 141 Altitude sensor 143 Altitude difference calculation unit 151 Wireless communication unit 153 Advanced information acquisition unit 155 Power detection unit 157 Storage unit 160 Control unit 161 Communication control unit 163 Difference calculation unit 165 Position determination unit 167 Height determination unit 300 Radio base station antenna 500a Base station steel tower

Claims (13)

A communication unit that sends and receives radio waves,
The altitude information acquisition unit that acquires altitude information indicating the altitude of your terminal,
The altitude information of the other terminal is acquired from another terminal different from the own terminal, and the altitude difference between the own terminal and the other terminal is calculated based on the altitude information of the own terminal and the other terminal. Altitude difference calculation unit and
A power detection unit that detects the first power value of the first reception signal based on the reception result of the radio wave, and
Based on the first power value, a position determination unit that determines whether or not the own terminal is located near the base station, and a position determination unit.
When both the altitude difference and the first power value are equal to or greater than the threshold value, the height determination unit that determines that the own terminal is in a high place and the height determination unit.
A control unit that controls the reception gain of the first received signal when it is determined that the own terminal is located in the vicinity of the base station and when the own terminal is determined to be in a high place.
A reception signal strength detection unit that detects a second power value of the first reception signal whose reception gain is controlled, and a reception signal strength detection unit.
With
In the position determination unit, when the first power value detected by the power detection unit indicates a value near the upper limit of the dynamic range of the received signal strength detection unit, the local terminal is in the vicinity of the base station. A communication terminal that is determined to be located in. According to claim 1, the position determination unit acquires position information indicating the position of the own terminal, and determines whether or not the own terminal is located in the vicinity of the base station based on the acquired position information. Described communication terminal. The communication terminal according to claim 2, wherein the position information indicating the position of the own terminal is information based on the detection result of the position coordinates of the own terminal. The altitude difference calculation unit
Acquire the position information indicating the position of each of the own terminal and the other terminal, and obtain the position information.
Based on the acquired position information, when both the own terminal and the other terminal are located within a predetermined range, the altitude difference between the own terminal and the other terminal is calculated.
The communication terminal according to claim 1. The altitude difference calculation unit
Acquire the position information indicating the position of each of the own terminal and the other terminal, and obtain the position information.
Based on the acquired position information, when the other of the own terminal and the other terminal is located within a predetermined range, the altitude difference between the own terminal and the other terminal is calculated. do,
The communication terminal according to claim 1. The location information of the other terminal is information based on the detection result of the power value of the second reception signal received at the other terminal, the communication terminal according to claim 4 or 5. The communication terminal according to claim 4 or 5, wherein the position information of the other terminal is information based on the detection result of the position coordinates of the other terminal. An amplification unit that amplifies the first received signal,
It is connected to the communication unit, has a first terminal and a second terminal, the first terminal is connected to the amplification unit, and the second terminal is connected to a bypass path that bypasses the amplification unit. Bypass and
With
The control unit controls the reception gain of the first reception signal by switching the switching unit.
The communication terminal according to any one of claims 1 to 7. The altitude difference between the first communication terminal and the second communication terminal calculated based on the altitude information indicating the altitude of each of the first communication terminal and the second communication terminal that transmit and receive radio waves, and the first Judgment indicating whether or not the first communication terminal is in a high place based on the detection result of the power value of the received signal based on the reception result of the radio wave by the communication terminal and whether or not both of them are equal to or more than the threshold value. The acquisition department that acquires the results, and
When it is determined that the first communication terminal is located near the base station based on the power value of the received signal, and when it is determined that the first communication terminal is located at a high place, the first communication terminal is said to be located. A control unit that controls the reception gain of 1 communication terminal,
A control device. The computer
Sending and receiving radio waves
Acquiring altitude information indicating the altitude of your terminal,
The altitude information of the other terminal is acquired from another terminal different from the own terminal, and the altitude difference between the own terminal and the other terminal is calculated based on the altitude information of the own terminal and the other terminal. To do and
Detecting the first power value of the first received signal based on the reception result of the radio wave, and
Determining whether or not the own terminal is located near the base station based on the first power value, and
When both the altitude difference and the first power value are equal to or greater than the threshold value, it is determined that the own terminal is in a high place.
Controlling the reception gain of the first received signal when it is determined that the own terminal is located in the vicinity of the base station and when the own terminal is determined to be in a high place.
To detect the second power value of the first received signal whose reception gain is controlled, and
Including
When the first power value indicates a value near the upper limit of the dynamic range of the received signal strength detection unit that detects the second power value, it is determined that the own terminal is located near the base station. ,
Communication method. The computer
The altitude difference between the first communication terminal and the second communication terminal calculated based on the altitude information indicating the altitude of each of the first communication terminal and the second communication terminal that transmit and receive radio waves, and the first Judgment indicating whether or not the first communication terminal is in a high place based on the detection result of the power value of the received signal based on the reception result of the radio wave by the communication terminal 1 and whether or not both of them are equal to or more than the threshold value. To get the result and
When it is determined that the first communication terminal is located near the base station based on the power value of the received signal, and when it is determined that the first communication terminal is located at a high place, the first communication terminal is said to be located. Controlling the reception gain of 1 communication terminal
Control methods, including. On the computer
Sending and receiving radio waves
Acquiring altitude information indicating the altitude of your terminal,
The altitude information of the other terminal is acquired from another terminal different from the own terminal, and the altitude difference between the own terminal and the other terminal is calculated based on the altitude information of the own terminal and the other terminal. To do and
Detecting the first power value of the first received signal based on the reception result of the radio wave, and
Determining whether or not the own terminal is located near the base station based on the first power value, and
When both the altitude difference and the first power value are equal to or greater than the threshold value, it is determined that the own terminal is in a high place.
Controlling the reception gain of the first received signal when it is determined that the own terminal is located in the vicinity of the base station and when the own terminal is determined to be in a high place.
To detect the second power value of the first received signal whose reception gain is controlled, and
Is a program that executes
When the first power value indicates a value near the upper limit of the dynamic range of the received signal strength detection unit that detects the second power value, it is determined that the own terminal is located near the base station. ,
program. On the computer
The altitude difference between the first communication terminal and the second communication terminal calculated based on the altitude information indicating the altitude of each of the first communication terminal and the second communication terminal that transmit and receive radio waves, and the first Judgment indicating whether or not the first communication terminal is in a high place based on the detection result of the power value of the received signal based on the reception result of the radio wave by the communication terminal 1 and whether or not both of them are equal to or more than the threshold value. To get the result and
When it is determined that the first communication terminal is located near the base station based on the power value of the received signal, and when it is determined that the first communication terminal is located at a high place, the first communication terminal is said to be located. Controlling the reception gain of 1 communication terminal
A program that runs.

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