JP7374549B2 - Radio field strength measurement method and radio field strength measurement program - Google Patents

Description

The present invention relates to a method for measuring radio field strength using a PHS carrier sense function and a program for measuring radio field strength.

The frequency band from 1884.5MHz to 1915.7MHz is allocated to PHS (abbreviation for Personal Handy-phone System), of which 1893.5MHz to 1906.1MHz is a shared band between public PHS and private PHS. Yes (see Patent Document 1). In this shared band, DECT (abbreviation for Digital Enhanced Cordless Telecommunications) and sXGP (abbreviation for shared eXtended Global Platform) can also be used.

In addition, as a conventional technology for detecting radio waves (carriers) of a wireless communication system in a shared band, in a TDMA narrowband digital cordless telephone system consisting of a digital cordless base station with a carrier sense function and a digital cordless handset, The digital cordless base station and digital cordless slave unit measure the leading edge, center, and trailing edge of the slot corresponding to the frequency to be used for each consecutive measurement frame consisting of the number of frames corresponding to the predetermined number of measurements. When measuring the received signal strength at each measurement point, the leading edge carrier measurement point and the trailing edge carrier measurement point are defined as the leading edge carrier measurement point, the center carrier measurement point, and the trailing edge carrier measurement point, respectively. At the carrier measurement point, the received signal strength is measured for the number of measurements at fixed points on the time axis over all measurement frames, while at the central carrier measurement point, for each measurement frame for the number of measurements, There is a method in which the received signal strength is measured by moving to a measurement time point shifted on the time axis by a predetermined time interval and using the shifted measurement time point as a central carrier measurement point (see Patent Document 2).

JP 2019-13038 Publication Patent No. 6410333

By the way, when performing wireless communication by coexisting multiple communication methods such as DECT and sXGP in addition to PHS for public and private use, it is possible that there are multiple communication methods in the surrounding area that use overlapping frequency bands. Since radio wave interference causes communication problems, it is necessary to make adjustments to prevent radio waves from interfering with each other in order to use each communication method. However, the spectrum analyzer used to measure the level of radio waves is expensive and large, so there is a problem that measuring the level of radio waves is expensive and time-consuming, and lacks versatility.

Furthermore, in the radio wave detection technology disclosed in Patent Document 2, in order to detect signals from other systems while maintaining synchronization with the conventional PHS system, radio wave detection is performed by shifting only one point in the center. For this reason, there is a problem in that a sufficient number of measurements are required to detect signals from other systems, and it takes time to detect signals.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a radio field strength measurement method and a radio field strength measurement program that can easily measure radio wave levels for each of a plurality of wireless communication systems.

In order to solve the above problem, the invention according to claim 1 uses the carrier sense of the PHS system to determine the reception signal strength of the PHS system and the reception of at least one other communication system whose frequency band overlaps with that of the PHS system. When measuring the signal strength with a PHS terminal , the PHS terminal divides the time of one slot of the PHS method into equal parts and sets the time interval so that it is shorter than the minimum width of the signal length of other communication methods. The present invention is characterized in that the three-point carrier sense measurement position is moved and the measurement is performed on a plurality of frames so that the measurement is performed at least once for all of the measurement time points.

The invention according to claim 2 is characterized in that, in the radio field intensity measuring method according to claim 1, the time interval is a time width obtained by dividing 625 μs for one slot of the PHS system into 12 equal parts.

The invention according to claim 3 is the radio field intensity measuring method according to claim 1 or 2, in which four slots in one frame of the PHS system are used as the measurement point pattern regarding the arrangement of the positions at which the three-point measurement is performed. For each, a measurement point pattern in which the three points are measured at a pitch of 625/12 μs with the front edge of each slot as the first measurement point, and a time point of 625/12×3 μs elapsed from the front edge of each slot. A measurement point pattern in which the three points are measured at a pitch of 625/12 μs as a first measurement point, and the three points at a pitch of 625/12 μs are measured at a time point 625/12×6 μs elapsed from the front edge of each slot as the first measurement point. A measurement point pattern for performing point measurement and a measurement point pattern for performing three-point measurement at a pitch of 625/12 μs with a time point 625/12×9 μs elapsed from the leading edge of each slot as the first measurement point are set. It is characterized by:

Further, the invention according to claim 4 is a program for controlling a carrier sense function of the PHS system, and the carrier sense of the PHS system determines the received signal strength of the PHS system and at least one frequency band in use that overlaps with the PHS system. When measuring the received signal strength of two other communication methods, we divided the time of one slot of the PHS method into equal parts and set the time interval so that it was shorter than the minimum width of the signal length of the other communication methods. The present invention is characterized in that the position at which the three-point carrier sense measurement is performed is moved so that the measurement is performed at least once for all measurement time points, and the measurement is performed on a plurality of frames.

The invention according to claim 5 is characterized in that, in the radio field strength measurement program according to claim 4, the time interval is a time width obtained by dividing 625 μs for one slot of the PHS system into 12 equal parts.

The invention according to claim 6 is the radio field strength measurement program according to claim 4 or 5, in which four slots in one frame of the PHS system are used as the measurement point pattern regarding the arrangement of the positions where the three-point measurement is performed. For each, a measurement point pattern in which the three points are measured at a pitch of 625/12 μs with the front edge of each slot as the first measurement point, and a time point of 625/12×3 μs elapsed from the front edge of each slot. A measurement point pattern in which the three points are measured at a pitch of 625/12 μs as a first measurement point, and the three points at a pitch of 625/12 μs are measured at a time point 625/12×6 μs elapsed from the front edge of each slot as the first measurement point. A measurement point pattern for performing point measurement and a measurement point pattern for performing three-point measurement at a pitch of 625/12 μs with a time point 625/12×9 μs elapsed from the leading edge of each slot as a first measurement point are defined. It is characterized by the fact that

According to the invention described in claim 1 or claim 4, the carrier sense function of the PHS system is used to detect, for example, a DECT system or sXGP system signal in addition to a private PHS system signal. It becomes possible to measure the level of DECT radio waves and sXGP radio waves in addition to private PHS radio waves based on the strength of the signal obtained. Furthermore, according to the inventions described in claims 1 and 4, the carrier sense function originally provided in a PHS terminal can be implemented using software without using any special equipment or changing the hardware of the PHS terminal. By simply controlling the system, it becomes possible to detect, for example, DECT system and sXGP system signals in addition to private PHS system signals. Therefore, it becomes possible to easily measure the radio wave level for each of a plurality of wireless communication systems.

According to the invention described in claim 1 or claim 4, in particular, all measurement points set at predetermined time intervals are measured at least once, so that the signal of the communication method assumed to be detected is detected. By setting the time interval between measurement points according to the signal length, it becomes possible to reliably detect signals of various communication methods. Therefore, with just one PHS terminal, in addition to the signals of surrounding private PHS systems that use the same frequency band, it is possible to detect, for example, DECT system and sXGP system signals and measure the level of radio waves of these systems. This makes it possible to significantly reduce the effort and cost required to avoid radio wave interference.

According to the invention described in claims 1 and 4, since measurements are performed at all measurement points set at predetermined time intervals for slots in the PHS system, the transmission timing and measurement of communication slots can be adjusted. It becomes possible to measure the radio wave level even if the timing is asynchronous. In other words, there is no need to maintain synchronization with the conventional PHS system. Therefore, it becomes possible to easily measure the radio wave level. According to the inventions described in claims 1 and 4, in addition, all three measurement points are measured while moving simultaneously (especially when the positions at which three points are measured do not overlap). It becomes possible to perform measurements in a short time. Specifically, for example, compared to the technology of Patent Document 2 that shifts only one point in the center, it is possible to perform measurements in a shorter time if the entire range is detected and the measurement interval is the same. Become.

According to the invention described in claim 2 or claim 5, the signal length of the signal used in communication is 625/12 μs or more, and specifically, the signal of the DECT method or the sXGP method can be reliably transmitted. It becomes possible to detect

According to the invention described in claim 3 or claim 6, since the measurement point pattern for measuring all the measurement points set at predetermined time intervals at least once is appropriately set, various communication It becomes possible to appropriately perform processing for detecting a signal of the system.

FIG. 2 is a schematic diagram illustrating the structure of a frame for each of the private PHS system, the DECT system, and the sXGP system. FIG. 2 is a schematic diagram illustrating three-point measurement applied to a slot in PHS carrier sense. FIG. 2 is a schematic diagram showing a measurement point pattern in Embodiment 1 of the present invention and explaining an image of measurement data at predetermined time intervals obtained as a result of measurement. FIG. 3 is a diagram illustrating a measurement point pattern applied for each measurement in Embodiment 1 of the present invention. FIG. 7 is a schematic diagram showing a measurement point pattern in Embodiment 3 of the present invention and explaining an image of measurement data at predetermined time intervals obtained as a result of measurement. FIG. 7 is a schematic diagram showing a measurement point pattern in Embodiment 4 of the present invention and explaining an image of measurement data at predetermined time intervals obtained as a result of measurement.

The present invention will be described below based on the illustrated embodiments.

(Embodiment 1)
This radio field strength measurement method uses the carrier sense function provided in the PHS terminal to measure the level (measurement of received signal strength) of private PHS radio waves, and in this embodiment, DECT radio waves and sXGP radio waves. It will be done. In this embodiment, a radio field strength measurement program is stored in the PHS terminal, and the radio field strength measurement method is implemented by executing the radio field strength measurement program. Note that the radio field strength measurement program is equipped to be activated by, for example, inputting a function code and a password into the PHS terminal. That is, the present invention enables a PHS terminal to function as a spectrum analyzer.

The PHS terminal is a PHS handset or a PHS base station equipped with a wireless communication function based on the private PHS system, and functions as a PHS telephone for private use/office use. When a PHS handset is used as a PHS terminal, by applying the present invention, the PHS handset becomes an easy-to-carry and portable device that functions as a spectrum analyzer. Note that the PHS terminal includes a storage unit that stores a radio field strength measurement program as a program for controlling the carrier sense function and stores the received signal strength measured by carrier sense.

PHS terminals use a carrier sense function to avoid radio wave interference by not communicating on the same frequency when the radio resource they are trying to use is being used by another radio device. , has a function of measuring received power (received signal strength) in a slot to be used for communication to check whether another wireless device is in use. Carrier sensing is performed for each slot scheduled to be used and for each frequency channel.

FIG. 1 is a schematic diagram illustrating the frame structure of each of the private PHS system, DECT system, and sXGP system. The private PHS system has a total of 42 channels, ch251 to ch255 and ch1 to ch37, and uses a frequency band of 1893.5 to 1906.1 MHz. In the private PHS system, one frame with a 5ms period consists of 8 slots in total: 4 upstream (transmission) slots and 4 downstream (reception) slots, and the signal length of 1 slot is 5ms/8 = 625μs. .

The DECT method uses the F1 channel (1894.752-1896.480MHz) whose center frequency is 1895.616MHz in the frequency band (1893.5-1906.1MHz) of the private PHS method, and whose center frequency is 1897.344MHz. F2 channel (1896.480-1898.208MHz), F3 channel (1898.208-1899.936MHz) whose center frequency is 1899.072MHz, F4 channel (1899.936-1901.664MHz) whose center frequency is 1900.800MHz ), an F5 channel (1901.664 to 1903.392 MHz) whose center frequency is 1902.528 MHz, and an F6 channel (1903.392 to 1905.120 MHz) whose center frequency is 1904.256 MHz are used. In the DECT method, one frame with a period of 10 ms consists of 12 upstream (transmission) slots and 12 downstream (reception) slots, a total of 24 slots, and the signal length of one slot is 10ms/24≒416.7μs. .

The sXGP system (5 MHz width) uses one wave #1 with a center frequency of 1899.1 MHz in the frequency band (1893.5 to 1906.1 MHz) of the private PHS system. In the sXGP system, one frame with a period of 10 ms consists of 4 subframes for uplink (transmission), 4 subframes for downlink (reception), and 2 special subframes (subframes for switching from downlink to uplink), for a total of 10 subframes. It is composed of subframes, and one subframe is 10ms/10=1ms. In the sXGP system, one subframe further includes 14 symbols, and the signal length of one symbol is 66.7 μs excluding the guard period.

The private PHS system uses 4 channels, ch12, ch18, ch35, and ch37, for transmitting control signals out of a total of 42 channels, ch251 to ch255 and ch1 to ch37, and excludes the above four channels for making calls. Uses 38 channels. In the PHS system, information transmitted in a communication channel is a communication packet, and the transmission time (signal length) of radio waves (carrier waves) transmitted per slot is constant.

The DECT system does not have a unique channel for transmitting control signals, and uses the same channels (six channels F1 to F6) for both control signals and speech signals. For this reason, the DECT system has a dummy bearer for control (also called a beacon; a signal sent periodically when there is no communication) and a traffic bearer (a signal sent when there is communication). The shortest signal length is 83.3 μs, and the signal length of the traffic bearer is 368.1 μs.

In PHS carrier sense (carrier sense provided in PHS terminals), three carrier sense measurement points (3 points) are set for one PHS slot (in other words, within a time width of 625 μs). It is possible to do so. Therefore, for example, when three locations, the leading edge, the center, and the trailing edge of one slot are set as measurement points, the time interval between the measurement points is 625 μs/2=312.5 μs.

On the other hand, the shortest signal length of the DECT method control signal (specifically, dummy bearer) is 83.3 μs, and the signal length of the sXGP method control signal (excluding the guard period) is 66.7 μs. Therefore, when the time interval between the carrier sense measurement points of the PHS method is set to 312.5 μs, the control signal transmission of the DECT method or sXGP method is completed between the carrier sense measurement points, and the control signal transmission of the DECT method or sXGP method is completed between the carrier sense measurement points. It is not possible to capture/detect sXGP control signals. That is, in order to measure the level of DECT radio waves or sXGP radio waves, it is necessary to perform sampling at time intervals of 66.7 μs or less, which is the minimum width of the signal length in the DECT method and sXGP method.

Further, the timing of transmission/sending of the frames of each communication method is not synchronized, and the frames are transmitted and received at any time, so it is not known when the signal to be detected will be transmitted. For this reason, it is not possible to reliably capture/detect the control signals of each communication method by simply shortening the time interval between the carrier sense measurement points, which are set at only three points for one slot in the PHS method. do not have.

Here, in the carrier sense of the PHS method, the number of points that can be set as a set of measurement points for one carrier sense measurement for one slot of the PHS method (in other words, during a time width of 625 μs) is There are three locations (three points), and it is not possible to set four or more locations (four points) or more as a series of measurement points for one carrier sense measurement for one slot and perform continuous measurement. It is not possible to repeat and continuously measure three locations (three points) as a series of carrier sense measurements for one slot. In other words, in the carrier sense of the PHS method, it is not possible to continuously sample four or more measurement points for one slot.

On the other hand, in carrier sensing in the PHS method, measurements for four slots are performed for one frame in the PHS method as a set/series of carrier sense measurements for one time. In addition, regarding the carrier sense function of PHS terminals, the time point at which the received signal strength is measured as a carrier sense measurement (in other words, the time position of the measurement point at which carrier sense measurement is performed for a slot in the PHS system) is controlled by carrier sense control. It can be set freely using the program. Furthermore, regarding the carrier sense function of the PHS terminal, the number of frames for carrier sense measurement can be freely set by a program for controlling carrier sense.

Therefore, in the radio field strength measuring method according to this embodiment, when measuring the received signal strength by carrier sense in the PHS system, at least one Each time, the position where the three-point carrier sense measurement is performed is moved so that the measurement is performed on a plurality of frames.

Further, the radio field strength measurement program according to this embodiment is a program that controls the carrier sense function of the PHS system, and is a program that controls the carrier sense function of the PHS system, and is a program that controls the carrier sense function of the PHS system at least once for all measurement points set at predetermined time intervals for the slots of the PHS system. The position where the three-point carrier sense measurement is performed is moved so that the measurement is performed, and the measurement is controlled to be performed on a plurality of frames.

In this embodiment, one slot of the PHS system is divided into 12 equal parts. Since one slot in the PHS system is 625 μs, if one slot is divided into 12 equal parts, the time width becomes 625 μs/12≈52.0833 μs. This 52.0833 μs is shorter than 66.7 μs, which is the minimum width of the signal length in the DECT method and the sXGP method.

Measurements performed at three locations as a set of carrier sense measurements for one slot in the PHS system are called "three-point measurements." The three measurement points are called a "measurement point set" (see FIG. 2). In this embodiment, the measurement interval in the three-point measurement is 625 μs/12≈52.0833 μs, and therefore the time interval between the measurement points in the measurement point set is 625 μs/12≈52.0833 μs.

As shown in Figure 2, the first measurement point in time series that makes up one set of measurement points is called the "first measurement point," and the next measurement point is called the "second measurement point." Furthermore, the last measurement point is called the "third measurement point."

In addition, in the PHS method carrier sense, it is possible to perform measurements for 4 slots as a set/series of processing for one carrier sense measurement for one frame in the PHS method. Three-point measurements are performed four times as a batch/series of measurements to obtain four sets of measurement points.

In this embodiment, as shown in FIG. 3, the following four measurement point patterns A to D are set. Each measurement point pattern is composed of four measurement point sets obtained by performing measurements for four slots as a set/series of processes of one carrier sense measurement. In other words, for each measurement point pattern, 3-point measurements are performed for each of the 4 slots as a set/series of processing for one carrier sense measurement (that is, 3-point measurements are performed 4 times). represents the distribution of 12 measurement points obtained by

<Measurement point pattern A>
For each of the four slots in one frame of the PHS method, three-point measurements were performed at a pitch of 625 μs/12≒52.0833 μs, with the leading edge of each slot (the beginning of the slot) as the first measurement point. be exposed.
<Measurement point pattern B>
For each of the four slots in one frame of the PHS method, 625 μs/12≒ 625 μs/12 ≒ 625 μs/12×3 μs from the leading edge of each slot (the beginning of the slot) Three-point measurements with a pitch of 52.0833 μs are performed.
<Measurement point pattern C>
For each of the four slots in one frame of the PHS system, the first measurement point is 625/12×6 μs from the leading edge of each slot (the beginning of the slot), and 625 μs/12≒ Three-point measurements with a pitch of 52.0833 μs are performed.
<Measurement point pattern D>
For each of the four slots in one frame of the PHS system, 625/12 x 9 μs from the leading edge of each slot (the beginning of the slot), with the first measurement point being 625 μs/12≒ Three-point measurements with a pitch of 52.0833 μs are performed.

In this embodiment, each of the measurement point patterns A to D described above is applied to the first four slots of the eight slots that make up one frame of the PHS system, and is applied to the latter four slots. applied to

Then, pseudo sampling data with a pitch of 625 μs/12≈52.0833 μs is obtained from the measurement results for all measurement points obtained by applying the measurement point patterns A to D.

According to sampling at a pitch of 625 μs/12≒52.0833 μs, in addition to the PHS slot signal with a signal length of 625 μs, the DECT method dummy bearer with a signal length of 83.3 μs, and the signal length (excluding the guard period) ) is 66.7 μs, and the signal of the sXGP symbol is also reliably detected.

As mentioned above, one slot of the PHS method is divided into 12 equal parts and the measurement time points are set, and then the four measurement points are set by shifting the three-point carrier sense measurement positions so that they do not overlap with each other. By applying patterns A to D, sampling data with a pitch of 625 μs/12≈52.0833 μs is obtained for a time width of 2500 μs corresponding to 4 slots of the PHS system. Therefore, by repeating the process of applying each of the four measurement point patterns A to D to each of the four slots of the PHS system four times, 625 μs/12≈ Sampling data with a pitch of 52.0833 μs is obtained. That is, sampling data with a pitch of 625 μs/12≈52.0833 μs can be obtained for the entire time width of one frame (10 ms) of the DECT method and the time width of one frame (10 ms) of the sXGP method.

Specifically, for example, as shown in FIG. 4, the following process is performed every time the carrier sense of the PHS method is measured.
1st measurement) Apply measurement point pattern A to the first four slots of the 1st frame. 2nd measurement) Apply measurement point pattern A to the first 4 slots of the 2nd frame. 3rd measurement) Apply measurement point pattern A to the first 4 slots of the 3rd frame. Apply measurement point pattern B to the slots. 4th measurement) Apply measurement point pattern B to the first 4 slots of the 4th frame. 5th measurement) Apply measurement point pattern C to the first 4 slots of the 5th frame. 6th measurement) Apply measurement point pattern C to the first 4 slots of the 6th frame. 7th measurement) Apply measurement point pattern D to the first 4 slots of the 7th frame. 8th measurement) Apply measurement point pattern C to the first 4 slots of the 8th frame. Apply measurement point pattern D to the slot

Next, the position of the slot in the frame targeted for carrier sense measurement is shifted backward by four slots by PHS carrier sense slot movement control, and then the following processing is performed.
9th measurement) Apply measurement point pattern A to the latter 4 slots of the 9th frame. 10th measurement) Apply measurement point pattern A to the latter 4 slots of the 10th frame. 11th measurement) Apply measurement point pattern A to the latter 4 slots of the 11th frame. Apply measurement point pattern B to the slots. 12th measurement) Apply measurement point pattern B to the latter four slots of the 12th frame. 13th measurement) Apply measurement point pattern C to the latter four slots of the 13th frame. 14th measurement) Apply measurement point pattern C to the latter 4 slots of the 14th frame. 15th measurement) Apply measurement point pattern D to the latter 4 slots of the 15th frame. 16th measurement) Apply measurement point pattern C to the latter 4 slots of the 16th frame. Apply measurement point pattern D to the slot

In order to obtain sampling data for the entire time width of one frame (10 ms) of the DECT method or the time width of one frame (10 ms) of the sXGP method, two frames of sampling data of the PHS method are required. In FIG. 4, odd-numbered frames are called "pseudo first frames" and even-numbered frames are called "pseudo second frames." In other words, all measurement point patterns A to D are applied to the first four slots of the pseudo first frame, and all measurement point patterns A to D are applied to the latter four slots of the pseudo first frame. , all measurement point patterns A to D are applied to the first four slots of the pseudo second frame, and all measurement point patterns A to D are applied to the latter four slots of the pseudo second frame. , sampling data can be obtained for the entire time width of one frame (10 ms) of the DECT method or one frame of time width (10 ms) of the sXGP method.

By performing the above-mentioned 16 measurements, radio waves (signals) in the frequency band for one channel are detected. Since a private PHS has a total of 42 channels, by repeating the above 16 measurements for 42 channels, measurements can be made for the entire frequency band of the private PHS, and even if the frequency bands overlap. Measurements are performed over the entire frequency band range of the DECT method and the entire frequency band range of the sXGP method.

Since the time required for one measurement of carrier sense in the PHS method is 5 ms (that is, the time width for one frame in the PHS method), the above 16 The time required for each measurement is 5ms×16=80ms. Since the measurement time per channel is 80 ms, measurement for all 42 channels of the private PHS is completed in 80 ms x 42 = 3.36 seconds.

Through the above processing, the received signal strength is obtained as a result of 16 measurements for each of all 42 channels of the private PHS. For example, the maximum value of the measured received signal strength is extracted for each channel (in other words, for each frequency band corresponding to the channel), and based on the maximum value, the received signal strength is used. Then, it is determined whether the frequency band corresponding to the channel in question is in use.

In order to execute the above processing, in the radio field strength measurement program according to this embodiment, the following contents are set as a program for controlling carrier sense of the PHS system.
<1> The time interval between measurement points at which three-point carrier sense measurement is performed is set to 625 μs/12≈52.0833 μs.
<2> The positions of the four slots targeted for carrier sense measurement are set as the first four slots of the total eight slots of one frame as the starting positions.
<3> The position of the first measurement point of the 3-point measurement is set at the leading edge of each slot (at the beginning of the slot) in the first measurement, and the position of the first measurement point in the 3-point measurement is set at the front edge of each slot (at the beginning of the slot), and in the 3rd, 5th, and 7th measurements. It is set at the measurement time point moved by 625/12×3 μs, respectively.
<4> Before the 9th measurement, shift by 4 slots using slot movement control (this causes the positions of the 4 slots targeted for carrier sense measurement to be in the latter 4 slots of the total 8 slots of 1 frame. Be changed).
<5> The position of the first measurement point of the 3-point measurement was set at the front edge of each slot (at the beginning of the slot) in the 9th measurement, and the It is set at the measurement time point moved by 625/12×3 μs, respectively.
<6> The number of measurements per channel is set to 16.

Note that the order in which the measurement point patterns A to D are applied is arbitrary, and as an example, the order in which they are applied is measurement point pattern B → measurement point pattern D → measurement point pattern A → measurement point pattern C. It's okay. In this case, for example, the position of the first measurement point for each measurement may be defined in the radio field strength measurement program.

According to the radio field strength measurement method and radio field strength measurement program according to this embodiment, the carrier sense function of the PHS system is used to detect, for example, DECT system and sXGP system signals in addition to private PHS system signals. Based on the strength of the detected signal, it becomes possible to measure the level of DECT radio waves and sXGP radio waves in addition to private PHS radio waves. Furthermore, by simply controlling the carrier sense function that PHS terminals are originally equipped with using software, without using special equipment or changing the hardware of PHS terminals, in addition to the signals of private PHS systems, For example, it becomes possible to detect signals of the DECT system or sXGP system. Therefore, it becomes possible to easily measure the radio wave level for each of a plurality of wireless communication systems.

According to the radio field strength measurement method and the radio field strength measurement program according to this embodiment, in particular, all measurement points set at predetermined time intervals are measured at least once. By setting the time interval between measurement points according to the signal length of the signal of each communication method, it becomes possible to reliably detect signals of various communication methods. Therefore, with just one PHS terminal, in addition to the signals of surrounding private PHS systems that use the same frequency band, it is possible to detect, for example, DECT system and sXGP system signals and measure the level of radio waves of these systems. This makes it possible to significantly reduce the effort and cost required to avoid radio wave interference.

According to the radio field strength measurement method and radio field strength measurement program according to this embodiment, measurements are performed at all measurement points set at predetermined time intervals for slots in the PHS system. It becomes possible to measure the radio wave level even if the transmission timing and measurement timing are asynchronous. In other words, there is no need to maintain synchronization with the conventional PHS system. Therefore, it becomes possible to easily measure the radio wave level. According to the radio field strength measurement method and radio field strength measurement program according to this embodiment, in addition, all three measurement time points are measured while moving simultaneously, so it is possible to perform measurements in a short time. Specifically, for example, compared to conventional technology that shifts only one point in the center, it is possible to perform measurements in a shorter time if the entire range is detected and the measurement interval is the same. Become.

Further, according to the radio field strength measurement method and the radio field strength measurement program according to this embodiment, signals of a communication method in which the signal length of the signal used for communication is 625/12 μs or more can be measured, for example, by a DECT method or the like. It becomes possible to reliably detect the sXGP signal.

In addition, according to the radio field strength measurement method and radio field strength measurement program according to this embodiment, a measurement point pattern is appropriately set for measuring all measurement points set at predetermined time intervals at least once. Therefore, it becomes possible to appropriately perform processing for detecting signals of various communication methods.

(Embodiment 2)
In the first embodiment, in addition to the PHS method, the communication methods for signals to be detected are the DECT method and the sXGP method; however, the communication methods for signals to be detected are the DECT method and the sXGP method. Either one of these may be used, or other communication methods may be used. Then, the time interval between measurement points is adjusted so that the signal length is equal to or less than the shortest signal length in the communication system to be detected.

Specifically, for example, if the DECT method is the only communication method for signals that are assumed to be detected in addition to the PHS method, the shortest signal length in the DECT method is 83.3 μs (dummy bearer), so the PHS method If one slot is divided into nine equal parts, the time width becomes 625 μs/9≈69.4444 μs, which is shorter than 83.3 μs.

In this case, one slot of the PHS method is divided into 9 equal parts and the measurement time points are set, and then the position for carrying out the three-point carrier sense measurement (the time interval between the measurement points is 625 μs/9≒69.4444 μs) is set. By applying three measurement point patterns that are shifted and set so as not to overlap each other, sampling data with a pitch of 625 μs/9≒69.4444 μs can be obtained for a time width of 2500 μs, which corresponds to 4 slots in the PHS system. It will be done.

Therefore, by repeating the process of applying each of the three measurement point patterns to each of the four slots of the PHS method four times (that is, performing 12 measurements), a time width of 10 ms corresponding to 16 slots can be obtained. As a whole, sampling data with a pitch of 625 μs/9≈69.4444 μs is obtained. That is, sampling data with a pitch of 625 μs/9≈69.4444 μs is obtained for the entire time width (10 ms) of one frame of the DECT method.

In the above case, in the radio field strength measurement program, the following contents are set as a program for controlling carrier sense of the PHS system.
<1> The time interval between measurement points at which three-point carrier sense measurement is performed is set to 625 μs/9≈69.4444 μs.
<2> The positions of the four slots targeted for carrier sense measurement are set as the first four slots of the total eight slots of one frame as the starting positions.
<3> The position of the first measurement point of the 3-point measurement is set at the front edge of each slot (at the beginning of the slot) in the first measurement, and the position of the first measurement point in the 3-point measurement is set at 625 / It is set at the measurement time point moved by 9×3 μs.
<4> Before the 7th measurement, shift by 4 slots using slot movement control (this causes the positions of the 4 slots targeted for carrier sense measurement to be in the latter 4 slots of the total 8 slots of 1 frame. Be changed).
<5> The position of the first measurement point of the 3-point measurement was set at the front edge of each slot (at the beginning of the slot) in the 7th measurement, and the position of the first measurement point was set at 625/25 in the 9th and 11th measurements. It is set at the measurement time point moved by 9×3 μs.
<6> The number of measurements per channel is set to 12.

According to the radio field strength measurement method and the radio field strength measurement program according to this embodiment, in particular, signals of a communication system in which the signal length of the signal used for communication is 625/9 μs or more, specifically, for example, a DECT system. It becomes possible to detect the signal reliably.

(Embodiment 3)
In the first embodiment, each measurement point pattern is set so that the three-point measurement positions for each measurement point pattern (that is, the positions of the first to third measurement points) do not overlap. The positions at which the three-point measurements are performed may be made to overlap.

Specifically, for example, in the case where, in addition to the PHS method, the only communication method for signals to be detected is the DECT method, as in the second embodiment, the shortest signal length in the DECT method is 83.3 μs. (dummy bearer), if one slot of the PHS system is divided into eight equal parts, the time width becomes 625 μs/8=78.125 μs, which is shorter than 83.3 μs.

In this case, one slot of the PHS method is divided into eight equal parts, measurement points are set, and the positions for carrying out three-point carrier sense measurement (the time interval between the measurement points is 78.125 μs) are shown in Figure 5. Three measurement point patterns X, Y, and Z set as follows may be applied. In this case, although the third measurement point of the measurement point pattern Z and the first measurement point of the measurement point pattern good. In the example shown in FIG. 5, sampling data with a pitch of 78.125 μs is obtained for a time width of 2500 μs, which corresponds to 4 slots of the PHS system.

Therefore, by repeating the process of applying each of the three measurement point patterns X, Y, and Z to each of the four slots of the PHS method four times (that is, performing measurements 12 times), it is possible to obtain a total of 16 slots. Sampling data with a pitch of 78.125 μs is obtained for the entire time width of 10 ms. That is, sampling data with a pitch of 78.125 μs is obtained for the entire time width (10 ms) of one frame of the DECT method.

In the case of the example shown in FIG. 5, the following contents are set in the radio field strength measurement program as a program for controlling carrier sense of the PHS system.
<1> The time interval between measurement points at which three-point carrier sense measurement is performed is set to 625 μs/8=78.125 μs.
<2> The positions of the four slots targeted for carrier sense measurement are set as the first four slots of the total eight slots of one frame as the starting positions.
<3> The position of the first measurement point of the 3-point measurement is set at the front edge of each slot (at the beginning of the slot) in the first measurement, and the position of the first measurement point in the 3-point measurement is set at 625 / It is set at the measurement time point moved by 8×3 μs.
<4> Before the 7th measurement, shift by 4 slots using slot movement control (this causes the positions of the 4 slots targeted for carrier sense measurement to be in the latter 4 slots of the total 8 slots of 1 frame. Be changed).
<5> The position of the first measurement point of the 3-point measurement was set at the front edge of each slot (at the beginning of the slot) in the 7th measurement, and the position of the first measurement point was set at 625/25 in the 9th and 11th measurements. It is set at the measurement time point moved by 8×3 μs.
<6> The number of measurements per channel is set to 12.

According to the radio field strength measurement method and the radio field strength measurement program according to this embodiment, in particular, signals of a communication system in which the signal length of the signal used for communication is 625/8 μs or more, specifically, for example, a DECT system. It becomes possible to detect the signal reliably.

(Embodiment 4)
In Embodiment 1, one slot of the PHS system is divided into equal parts and measurement time points are set, and the positions at which three points of each measurement point pattern are measured (that is, the positions of the first to third measurement points) are set as follows. Although the measurement points are set at mutually adjacent measurement points, the positions at which the three-point measurements are performed may be set at measurement points far apart from each other.

Specifically, for example, one slot of the PHS method is divided into 12 equal parts, measurement time points are set, and the positions for carrying out the three-point carrier sense measurement are set as shown in FIG. 6 in a four measurement point pattern A. ~D may be applied. In the example shown in FIG. 6, the time interval between the measurement points at which the three-point carrier sense measurement is performed is set to 625 μs/12×4≈208.3333 μs. In the example shown in FIG. 6, by repeating the process of applying each of the four measurement point patterns A to D to each of the four slots of the PHS system four times, the entire time width of 10 ms, which corresponds to 16 slots, is , 625 μs/12≈52.0833 μs pitch sampling data is obtained.

In the case of the example shown in FIG. 6, the following contents are set in the radio field strength measurement program as a program for controlling carrier sense of the PHS system.
<1> The time interval between measurement points at which three-point carrier sense measurement is performed is set to 625 μs/12×4≈208.3333 μs.
<2> The positions of the four slots targeted for carrier sense measurement are set as the first four slots of the total eight slots of one frame as the starting positions.
<3> The position of the first measurement point of the 3-point measurement is set at the leading edge of each slot (at the beginning of the slot) in the first measurement, and the position of the first measurement point in the 3-point measurement is set at the front edge of each slot (at the beginning of the slot), and in the 3rd, 5th, and 7th measurements. The measurement time points are set at the measurement points shifted by 625/12 μs, respectively.
<4> Before the 9th measurement, shift by 4 slots using slot movement control (this causes the positions of the 4 slots targeted for carrier sense measurement to be in the latter 4 slots of the total 8 slots of 1 frame. Be changed).
<5> The position of the first measurement point of the 3-point measurement was set at the front edge of each slot (at the beginning of the slot) in the 9th measurement, and the The measurement time points are set at the measurement points shifted by 625/12 μs, respectively.
<6> The number of measurements per channel is set to 16.

Although the embodiments of this invention have been described above, the specific configuration is not limited to the above embodiments, and even if there are changes in the design within the scope of the gist of this invention, Included in invention. For example, in the above embodiment, a PHS terminal that functions as a PHS telephone for private use/business use is used, but the radio field strength measurement method according to the present invention may be applied or the radio field strength measurement method according to the present invention may be applied. The device in which the program is installed only needs to have a PHS carrier sense function (in other words, it only needs to be able to execute PHS carrier sense), and may not function as a PHS telephone.

Claims (6)

When the PHS terminal measures the received signal strength of the PHS system and the received signal strength of at least one other communication system whose frequency band is overlapping with the PHS system using carrier sense of the PHS system ,
The PHS terminal divides the time of one slot of the PHS method into equal parts , and performs measurement at least once at all measurement points at which the time intervals are set to be shorter than the minimum width of the signal length of other communication methods. Measurement is performed on multiple frames by moving the position where three-point carrier sense measurement is performed so that
A radio field strength measurement method characterized by: The time interval is a time width obtained by dividing 625 μs for one slot of the PHS system into 12 equal parts,
The radio field intensity measuring method according to claim 1, characterized in that: As a measurement point pattern regarding the arrangement of the positions where the three-point measurement is performed,
For each of the four slots in one frame of the PHS system,
A measurement point pattern in which the three-point measurement is performed at a pitch of 625/12 μs with the front edge of each slot as the first measurement point;
a measurement point pattern in which the three points are measured at a pitch of 625/12 μs, with a first measurement point at a time point 625/12×3 μs elapsed from the leading edge of each slot;
A measurement point pattern in which the three points are measured at a pitch of 625/12 μs with a first measurement point at a time point 625/12×6 μs elapsed from the leading edge of each slot;
A measurement point pattern is set in which the three points are measured at a pitch of 625/12 μs, with a time point 625/12×9 μs elapsed from the leading edge of each slot as a first measurement point;
The radio field intensity measuring method according to claim 1 or 2, characterized in that: This is a program that controls the carrier sense function of the PHS system.
When measuring the received signal strength of the PHS method and the received signal strength of at least one other communication method whose usage frequency band overlaps with the PHS method by carrier sense of the PHS method ,
The time of one slot in the PHS method is divided equally, and the time interval is set to be shorter than the minimum width of the signal length in other communication methods.Measurement is performed at least once for all measurement points. Controls the measurement to be performed on multiple frames by moving the position where the three-point carrier sense measurement is performed.
A radio field strength measurement program characterized by: The time interval is a time width obtained by dividing 625 μs for one slot of the PHS system into 12 equal parts,
The radio field intensity measurement program according to claim 4. As a measurement point pattern regarding the arrangement of the positions where the three-point measurement is performed,
For each of the four slots in one frame of the PHS system,
A measurement point pattern in which the three-point measurement is performed at a pitch of 625/12 μs with the front edge of each slot as the first measurement point;
a measurement point pattern in which the three points are measured at a pitch of 625/12 μs, with a first measurement point at a time point 625/12×3 μs elapsed from the leading edge of each slot;
A measurement point pattern in which the three points are measured at a pitch of 625/12 μs with a first measurement point at a time point 625/12×6 μs elapsed from the leading edge of each slot;
A measurement point pattern is defined in which the three points are measured at a pitch of 625/12 μs, with a first measurement point at a time point 625/12×9 μs elapsed from the leading edge of each slot.
The radio field intensity measurement program according to claim 4 or 5, characterized in that:

Images