JP2004186865A - Wireless data collecting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the wireless data collecting system for reducing wasteful power consumption as a result of a master unit operated from radio wave interference from other wireless system or a noise generating source and decreasing communication traffic. <P>SOLUTION: The master unit 1 is provided with: a master unit wireless communication means 2 for at least receiving data in a way of making its reception detection level variable and having a transmission function; a master unit ID storage means 3 for storing an identification code (ID) to be attached to the data when the master unit wireless communication means 2 transmits the data; a slave unit reception level detection means 4 for detecting the reception level received by the master unit wireless communication means 2; a maser unit carrier sense level calculation means 7 for attaching a prescribed margin to the slave unit reception level; and a master unit carrier sense level setting means for setting the level calculated by the maser unit carrier sense level calculation means 7 to the master unit wireless communication means 2. Thus, the radio wave interference from other wireless apparatuses than a slave unit 11 supported by the master unit 1 can be reduced. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a wireless data collection system in which radio interference of a wireless system including a master unit and one or more slave units is reduced.
[0002]
[Prior art]
In this type of conventional wireless data collection system, there is a system in which the number of interferences is calculated from a response message of a slave unit to a broadcast message transmitted from a master unit and a frequency with the least interference is selected (for example, see Patent Document 1). .
[0003]
In FIG. 11, in a wireless communication system that performs communication using a frequency selected from a plurality of frequencies, a base unit wireless communication unit 2 that transmits or receives at least two or more wireless frequencies, and a base unit wireless communication unit 2 , A base unit ID storage unit 3 for storing an ID added to data at the time of transmission, a base unit channel storage unit 20 (hereinafter referred to as a channel) for storing a transmission frequency of the base unit wireless communication unit 2, and a base unit wireless communication. Means 2 for transmitting a broadcast message for investigating interference, and a response to the response from the base unit reception analysis means 8 to determine the result and change the base unit CH storage means 20; The base unit transmission control unit 8 that performs data transmission processing to the unit 2 and the base unit reception data analysis unit 7 that analyzes data received from the base unit wireless communication unit 2 perform processing of transmission / reception data and the like. A master unit provided with the device control unit 9, a slave unit wireless communication unit 12 transmitting or receiving at least two or more radio frequencies, and a slave unit storing an ID added to data at the time of transmission by the slave unit wireless communication unit 12. A slave ID storage unit 13, a slave unit CH storage unit 22 for storing the transmission frequency of the slave unit wireless communication unit 13, a slave unit reception analysis unit 17 for analyzing data received from the slave unit wireless communication unit 12, The wireless communication unit 12 includes a slave unit transmission control unit 18 for performing data transmission processing and a slave unit including a slave unit control unit for performing processing such as transmission / reception data. The communication is performed so as to detect the frequency with the least interference and to change the frequency of the base station wireless communication means 2 to that frequency.
[0004]
[Patent Document 1]
JP-A-10-42353 [0005]
[Problems to be solved by the invention]
However, in the conventional wireless data collection system described above, broadcast data cannot be collected unless the installed systems have the same specifications, and the communication protocol is different even though the same frequency is used. It was difficult to detect interference when the system was nearby. Further, when radio wave interference occurs, the wireless master device and the slave device needlessly operate, and there is a problem that power consumption increases.
[0006]
[Means for Solving the Problems]
In order to solve the above problem, the present invention provides a radio base station that, when it determines that reception has been performed from a slave that it supports, performs subsequent reception with a value obtained by adding a margin to the reception level. Does not support the handset of which reception level is lower than necessary which is not supported.
[0007]
According to the above invention, when another company's systems are installed near the own system, it is possible to reduce radio wave interference therewith.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
A wireless data collection system according to a first aspect of the present invention provides a wireless communication system including a master unit and one or more slave units, wherein at least a reception detection level (carrier sense level) is variably received and transmitted. Master wireless communication means having a function, master ID storage means for storing an identification code (ID) added to data at the time of transmission by the master wireless communication means, and a reception level received by the master wireless communication means. A slave reception level detection means for detecting, a master carrier sense level calculation means for adding a predetermined margin to the slave reception level, and a master wireless communication means for calculating the level calculated by the master carrier sense level calculation means Carrier sense setting means for setting, master reception analysis means for analyzing data received from the master wireless communication means, and transmission state of the master wireless communication means. Base unit transmission control unit for performing the processing of the transmission / reception data and the like, a base unit including a base unit control unit for transmitting or receiving the base unit, A slave ID storage means for storing an identification code (ID) added to data at the time of transmission, a slave reception analysis means for analyzing data received from the slave wireless communication means, and a slave wireless communication means. It has a slave unit provided with slave unit transmission control means for performing data transmission processing and a slave unit control means for performing processing of the transmission / reception data and the like.
[0009]
Then, since the master unit carrier sense level calculation means sets a level obtained by adding a margin to the reception level received by the master unit from the slave unit as a carrier sense level, it is possible to reduce interference such as radio waves received by the master unit. .
[0010]
Further, the wireless data collection system according to claim 2 of the present invention operates to detect the lowest level among the reception levels from all the slaves supported by the master. It has.
[0011]
Then, the slave unit receiving analysis means operates as a carrier sense level with a margin added to the reception level of the slave unit having the lowest reception level supported by the master unit, so that interference of radio waves received by the master unit as a whole system is reduced. It becomes possible.
[0012]
The wireless data collection system according to claim 3 of the present invention further comprises a base unit reception level detection unit for detecting the reception level received by the base unit wireless communication unit, and adding a predetermined margin to the base unit reception level. And a slave carrier sense setting means for setting the level calculated by the slave carrier sense level calculating means in the slave wireless communication means.
[0013]
Then, since the slave unit carrier sense level calculation means sets a level obtained by adding a margin to the reception level received by the slave unit from the master unit as a carrier sense level, it is possible to reduce interference such as radio waves received by the slave unit. .
[0014]
Also, in the wireless data collection system according to claim 4 of the present invention, the master unit is configured to transmit the contents of the master unit carrier sense level calculating means to the slave unit.
[0015]
Since an appropriate carrier sense level is set in the slave unit in accordance with an instruction from the master unit, it is possible to reduce radio wave interference received by the slave unit.
[0016]
Further, the wireless data collection system according to claim 5 of the present invention is configured such that the carrier sense setting means sets a predetermined value in the master unit wireless communication unit or the slave unit wireless communication unit if reception is not performed for a predetermined time. Things.
[0017]
Then, when reception cannot be performed at the carrier sense level set due to a change in environment or the like, the carrier sense level is returned to the initial state, so that it is possible to avoid a situation in which communication is not possible.
[0018]
The wireless data collection system according to claim 6 of the present invention is configured such that at least the value of the base unit carrier sense level calculating means can be confirmed via a communication medium.
[0019]
Since the master unit reports the change of the wireless channel to the center or the like, the center can grasp the carrier sense level used by the wireless system, so that the management of the system can be performed closely.
[0020]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0021]
(Example 1)
FIG. 1 is a block diagram illustrating a wireless data collection system according to a first embodiment of the present invention.
[0022]
In FIG. 1, reference numeral 1 denotes a master unit, a master unit wireless communication unit 2 having at least a variable reception detection level (carrier sense level) for reception and having a transmission function, and a master unit wireless communication unit 2 for transmitting data when transmitting. Base unit ID storage unit 3 for storing an identification code (ID) added to the base unit; slave unit reception level detection unit 4 for detecting a reception level received by master unit wireless communication unit 2; , A base unit carrier sense level setting unit 6 for setting the level calculated by the base unit carrier sense level calculation unit 5 to the base unit wireless communication unit 2, and a base unit wireless communication A base unit reception analysis unit 7 for analyzing data received from the unit 2; a base unit transmission control unit 8 for setting the base unit wireless communication unit 2 in a transmission state; Cormorant is equipped with a master unit control means 9.
[0023]
On the other hand, 2 is a slave unit, and a slave unit wireless communication means 12 for transmitting or receiving with the master unit 1 and a slave unit ID storage for storing an identification code (ID) added to data by the slave unit wireless communication means 12 at the time of transmission. Means 13, a slave unit reception analyzing means 17 for analyzing data received from the slave wireless communication means 12, a slave transmission control means 17 for performing data transmission processing to the slave wireless communication means 12, the transmission / reception data, etc. Is provided.
[0024]
Further, the slave unit reception level detecting means 4 is configured to determine only reception from the slave unit supported by the master unit 1 based on the slave unit ID of the slave unit 11. Although not shown, the master unit 1 and the slave unit 21 are configured with a battery power source so that installation work is simplified.
[0025]
Further, the master unit ID storage unit 3, the master unit carrier sense level calculating unit 5, the master unit reception analysis unit 7, the master unit transmission control unit 8, the master unit control unit 9 and the like are constituted by microcomputers. Further, although not shown, the receiving unit of the master unit wireless communication means is configured to vary the detection level of the carrier sense level using D / A.
[0026]
FIG. 2 is a diagram illustrating an installation example of the wireless data collection system according to the first embodiment of the present invention.
[0027]
In FIG. 2, reference numeral 31 denotes a road, and a house 30a having a base unit 1a installed therearound, and slave units 11a, 11b, 11c, 11d supported by the base unit 1a are set in houses 30b, 30c, 30d, 30e, respectively. ing.
[0028]
In addition, master unit 1b is installed in house 30i, and slave units 11e, 11f, 11g, and 21h supported by master unit 1b are installed in houses 30f, 30g, 30h, and 30j, respectively. The broken line 32 indicates the range of radio waves transmitted by the base unit 1a, and the base unit 1a includes the base units 1a, 11b, 11c, and 11d in the range, but the base unit 1b of the system of the base unit 1b. , Slave units 11e, 11f, 11g, and 11h fall within the range.
[0029]
Further, when the base unit 1b raises the carrier sense level, the situation becomes equivalent to the case where the reach of radio waves transmitted from other places becomes narrow. This situation is indicated by a broken line 33. Therefore, by increasing the carrier sense level of the master unit 1b, it is possible to at least prevent the master unit 1b from being affected by the master unit 1a. The same applies to the case where the noise source 41 is located nearby.
[0030]
FIG. 3 is a flowchart showing the operation of the main part of the slave unit reception level detecting means 4, the master unit carrier sense level calculating means 5, the master unit carrier sense level setting means 6 and the like constituting the wireless data collection system according to the first embodiment of the present invention. FIG.
[0031]
In FIG. 3, after the main unit wireless communication unit 2 receives the data in step 42, it is determined in step 43 whether data addressed to the main unit 1 has been received. I do. If it is addressed to the parent device 1, the reception level from the child device is detected by the child device reception level detection means 4 in step 44, and the parent device carrier sense level calculation means 5 makes the reception level of the child device, for example, in step 45. If it is -50 dBm, the carrier sense level is calculated to be -70 dBm with a margin, and the carrier sense level of the master unit wireless communication unit 2 is set to -70 dBm by the master unit carrier sense level setting unit 6.
[0032]
Assuming that the initial state of the carrier sense level of base unit 1 is set to -100 dBm, the above setting reduces the degree of radio wave interference from other systems by about 30 dB. Further, the margin can be changed according to the reception level.
[0033]
As described above, by changing the setting of the carrier sense level of the base unit wireless communication unit 2 by the base unit carrier sense level setting unit 6 and the like, it becomes possible to reduce interference such as radio waves received by the base unit. It is possible to prevent the consumption of the battery power.
[0034]
(Example 2)
FIG. 4 is a flowchart showing the operation of the main part of the slave unit reception level detecting means 4, master unit carrier sense level calculating means 5, master unit carrier sense level setting means 6, etc., which constitute the wireless data collection system according to the first embodiment of the present invention. It is.
[0035]
In FIG. 4, after the master unit wireless communication means 2 has received the data in step 52, it is determined in step 53 whether data addressed to the master device 1 has been received. I do. If it is addressed to master 1, it is determined in step 54 whether all the slaves supported by master 1 have been received. If not, the process proceeds to step 58 to analyze the reception level of the slave. Save the result.
[0036]
On the other hand, if the reception levels of all the slaves have been received, the lowest reception level value among all the slaves is determined in step 55, and the master carrier sense level calculating means 5 determines in step 56, for example, the slave level. If the receiver level is -50 dBm, the carrier sense level is calculated to be -70 dBm with a margin, and the carrier sense level of the master unit wireless communication means 2 is set to -70 dBm by the master carrier sense level setting means 6. .
[0037]
Further, assuming that the initial state of the carrier sense level of the base unit 1 is set to -100 dBm, the above setting reduces the degree to which the system of the base unit 1 receives radio wave interference from other systems by about 30 dB.
[0038]
As described above, by changing the setting of the carrier sense level of the base unit wireless communication unit 2 by the base unit carrier sense level setting unit 6 and the like, it becomes possible to reduce interference such as radio waves received by the base unit. It is possible to prevent the consumption of the battery power.
[0039]
(Example 3)
FIG. 5 is a block diagram of the wireless data collection system according to the third embodiment of the present invention.
[0040]
In FIG. 5, reference numeral 11 denotes a slave unit, a master unit wireless communication unit 12 having at least a reception detection level (carrier sense level) variably receiving and having a transmission function, and a base unit wireless communication unit 12 transmitting data upon transmission. Slave ID storage means 13 for storing an identification code (ID) to be added; master reception level detection means 14 for detecting the reception level received by master wireless communication means 12; and a predetermined margin for the master reception level. Slave unit carrier sense level calculating unit 15 to be added, slave unit carrier sense level setting unit 16 for setting the level calculated by slave unit carrier sense level calculating unit 15 to slave unit wireless communication unit 12, and slave unit wireless communication unit A slave unit reception analyzing means 17 for analyzing data received from the slave unit 12, a slave unit transmission control means 18 for setting the slave unit wireless communication unit 12 to a transmission state, And a slave unit control unit 19 that performs processing such as transmitting and receiving data.
[0041]
The master unit reception level detecting means 14 is configured to determine only reception from a master unit that supports the slave unit 11 based on the master unit ID of the master unit 1.
[0042]
FIG. 6 is a flowchart showing the operation of the main parts of the base unit reception level detecting unit 14, the subunit carrier sense level calculating unit 15, the subunit carrier sense level setting unit 16 and the like constituting the wireless data collection system according to the third embodiment of the present invention. FIG.
[0043]
In FIG. 6, after the slave unit wireless communication means 12 has received the data at step 62, it is determined at step 63 whether data addressed to the slave unit 11 has been received. I do. In the case of the slave unit 11, the reception level from the master unit is detected by the master unit reception level detection unit 14 in step 64, and in step 65, the master unit reception level is calculated by the slave unit carrier sense level calculation unit 15. If it is -50 dBm, the carrier sense level is calculated to be -70 dBm with a margin, and the carrier sense level of the slave wireless communication means 12 is set to -70 dBm by the slave carrier sense level setting means 16.
[0044]
Further, assuming that the initial state of the carrier sense level of the slave unit 1 is set to -100 dBm, the above setting reduces the degree of radio interference from other systems by about 30 dB.
[0045]
As described above, by changing the setting of the carrier sense level of the slave unit wireless communication means 12 by the slave unit carrier sense level setting means 16 and the like, it becomes possible to reduce interference of radio waves and the like received by the slave unit. It is possible to prevent the consumption of the battery power.
[0046]
(Example 4)
FIG. 7 is a flowchart showing the operation of main parts of the slave unit reception level detecting means 4, master unit carrier sense level calculating means 5, master unit carrier sense level setting means 6, etc., which constitute the wireless data collection system according to the first embodiment of the present invention. It is.
[0047]
In FIG. 7, after the master unit wireless communication means 2 has received the data in step 42, it is determined in step 43 whether or not data addressed to the master device 1 has been received. I do. If it is addressed to the parent device 1, the reception level from the child device is detected by the child device reception level detection means 4 in step 44, and the parent device carrier sense level calculation means 5 makes the reception level of the child device, for example, in step 45. If it is -50 dBm, the carrier sense level is calculated to be -70 dBm with a margin, and the carrier sense level of the master unit wireless communication unit 2 is set to -70 dBm by the master unit carrier sense level setting unit 6.
[0048]
Assuming that the initial state of the carrier sense level of base unit 1 is set to -100 dBm, the above setting reduces the degree of radio wave interference from other systems by about 30 dB. Thereafter, in step 71, the carrier sense level is transmitted to the slave unit 11 to change the carrier sense level of the slave unit 11. Although the parent device 1 and the child device 11 are not shown, if the antennas and the configurations of the parent device wireless communication means 2 and the child device wireless communication means 12 are equivalent, the value of the carrier sense level of the parent device 1 11 can be set.
[0049]
As described above, it is possible to immediately set the carrier sense level of the master unit to the slave unit, and it is possible to quickly start up the system and reduce interference such as radio waves received by the system of the master unit and slave unit. In addition, unnecessary consumption of battery power can be prevented.
[0050]
(Example 5)
FIG. 8 is a flowchart showing the operation of the main parts of the slave unit reception level detecting means 4, the master unit carrier sense level calculating means 5, the master unit carrier sense level setting means 6, etc., which constitute the wireless data collection system according to the first embodiment of the present invention. It is.
[0051]
In FIG. 8, after the parent device wireless communication means 2 receives the data at step 42, it is determined at step 43 whether data addressed to the master device 1 has been received. If it is addressed to the parent device 1, the reception level from the child device is detected by the child device reception level detection means 4 in step 44, and the parent device carrier sense level calculation means 5 makes the reception level of the child device, for example, in step 45. If it is -50 dBm, the carrier sense level is calculated to be -70 dBm with a margin, and the carrier sense level of the master unit wireless communication unit 2 is set to -70 dBm by the master unit carrier sense level setting unit 6.
[0052]
Assuming that the initial state of the carrier sense level of base unit 1 is set to -100 dBm, the above setting reduces the degree of radio wave interference from other systems by about 30 dB. Further, the margin can be changed according to the reception level.
[0053]
On the other hand, it is determined in step 81 whether there has been reception for a certain period of time. If there has been no reception for a certain period of time, in step 82 the carrier sense level is changed. For example, by setting it to -100 dBm, it becomes possible to recover when reception does not proceed normally due to a change in environment or the like.
[0054]
As described above, by changing the setting of the carrier sense level of the base unit wireless communication unit 2 by the base unit carrier sense level setting unit 6 and the like, it becomes possible to reduce interference such as radio waves received by the base unit. In addition, it is possible to prevent the consumption of the battery power and to restore the reception performance when the reception condition is deteriorated due to a change in the environment.
[0055]
(Example 6)
FIG. 9 is a block diagram illustrating a wireless data collection system according to a sixth embodiment of the present invention.
[0056]
In FIG. 9, the base unit 1 is connected to the communication infrastructure 91 from the base unit control means 9, and is configured to be able to communicate with a center or the like (not shown) for exchanging information. FIG. 10 is a flowchart showing the operation of the main parts of the slave unit reception level detection unit 4, the base unit carrier sense level calculation unit 5, the base unit carrier sense level setting unit 6 and the like constituting the wireless data collection system according to the first embodiment of the present invention. It is.
[0057]
In FIG. 3, after the main unit wireless communication unit 2 receives the data in step 42, it is determined in step 43 whether data addressed to the main unit 1 has been received. I do. If it is addressed to the parent device 1, the reception level from the child device is detected by the child device reception level detection means 4 in step 44, and the parent device carrier sense level calculation means 5 makes the reception level of the child device, for example, in step 45. If it is -50 dBm, the carrier sense level is calculated to be -70 dBm with a margin, and the carrier sense level of the master unit wireless communication unit 2 is set to -70 dBm by the master unit carrier sense level setting unit 6.
[0058]
Assuming that the initial state of the carrier sense level of base unit 1 is set to -100 dBm, the above setting reduces the degree of radio wave interference from other systems by about 30 dB. After that, in step 101, the carrier sense change content can be transmitted to the center via the communication infrastructure 91.
[0059]
As described above, since base unit 1 reports the change information of the carrier sense to the center or the like, the center can grasp the state of the wireless system, so that it is possible to perform the system management in detail.
[0060]
【The invention's effect】
As described above, according to the present invention, when there is another system that cannot communicate near its own system, or when there is a noise source that generates noise, it operates to reduce the influence of radio wave interference. It is possible to increase power consumption and reduce communication traffic by being activated.
[Brief description of the drawings]
FIG. 1 is a block diagram of a wireless data collection system according to a first embodiment of the present invention. FIG. 2 is a conceptual diagram showing an example of installation of the system. FIG. 3 is a flowchart showing an operation of the system. FIG. 5 is a flowchart showing the operation of the wireless data collection system in Embodiment 2. FIG. 5 is a block diagram of the wireless data collection system in Embodiment 3 of the present invention. FIG. 6 is a flowchart showing the operation of the system. FIG. FIG. 8 is a flowchart showing the operation of the wireless data collection system in Embodiment 5. FIG. 8 is a flowchart showing the operation of the wireless data collection system in Embodiment 5 of the present invention. FIG. 9 is a block diagram of the wireless data collection system in Embodiment 6 of the present invention. 10 is a flowchart showing the operation of the system. FIG. 11 is a block diagram of a conventional wireless data collection device.
Reference Signs List 1 master unit 2 master unit wireless communication unit 3 master unit ID storage unit 4 slave unit reception level detection unit 5 master unit carrier sense level calculation unit 6 master unit carrier sense setting unit 7 master unit reception analysis unit 8 master unit transmission control unit 9 Base unit control unit 11 Remote unit 12 Remote unit wireless communication unit 13 Remote unit ID storage unit 14 Main unit reception level detection unit 15 Remote unit carrier sense level calculation unit 16 Remote unit carrier sense level setting unit 17 Remote unit reception analysis unit 18 Child Machine transmission control means 19 slave machine control means

Claims (6)

In a wireless communication system including a master unit and at least one slave unit that can communicate with the master unit, the master unit performs reception while variably receiving at least a reception detection level (carrier sense level) and has a transmission function. A base unit wireless communication unit, a base unit ID storage unit for storing an identification code (ID) added to data at the time of transmission by the base unit wireless communication unit, and a reception level detected by the base unit wireless communication unit. Slave unit receiving level detecting unit, master unit carrier sense level calculating unit that adds a predetermined margin to the slave unit receiving level, and the level calculated by the master unit carrier sense level calculating unit to the master unit wireless communication unit. A base unit carrier sense level setting unit to be set; a base unit reception analyzing unit for analyzing received data from the base unit wireless communication unit; Master unit transmission control means, and master unit control means for performing processing of the transmission and reception data and the like, wherein the slave unit, the slave unit wireless communication means for transmitting and receiving with the master unit, and the slave unit wireless communication means Slave ID storage means for storing an identification code (ID) added to data at the time of transmission; slave reception analysis means for analyzing data received from the slave wireless communication means; and data transmission to the slave wireless communication means A wireless data collection system comprising: a handset transmission control means for performing the above processing; and a handset control means for performing the processing of the transmission / reception data and the like. 2. The wireless data collection system according to claim 1, wherein the slave unit reception level detecting means operates to detect a lowest level among reception levels from all slave units supported by the master unit. The slave unit includes: a master unit reception level detection unit that detects a reception level received by the slave unit wireless communication unit; a slave unit carrier sense level calculation unit that adds a predetermined margin to the master unit reception level; 2. The wireless data collection system according to claim 1, further comprising: a slave unit carrier sense setting unit that sets the level calculated by the level calculation unit in the slave unit wireless communication unit. 4. The wireless data collection system according to claim 1, wherein the master transmits the contents of the master carrier sense level calculating means to the slave. 4. The wireless data collection system according to claim 1, wherein the carrier sense setting means sets a predetermined value in the master unit wireless communication unit or the slave unit wireless communication unit if reception is not performed for a predetermined time. 4. The wireless data collection system according to claim 1, wherein the value of the base unit carrier sense level calculating means can be confirmed at least via a communication medium.

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