JP2014204414A - Management device, management method, and radio communication system - Google Patents

Management device, management method, and radio communication system Download PDF

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JP2014204414A
JP2014204414A JP2013082000A JP2013082000A JP2014204414A JP 2014204414 A JP2014204414 A JP 2014204414A JP 2013082000 A JP2013082000 A JP 2013082000A JP 2013082000 A JP2013082000 A JP 2013082000A JP 2014204414 A JP2014204414 A JP 2014204414A
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wireless
communication
interference
management
interference determination
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JP6236839B2 (en
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直之 藤本
Naoyuki Fujimoto
直之 藤本
望月 聡
Satoshi Mochizuki
聡 望月
米澤 正明
Masaaki Yonezawa
正明 米澤
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横河電機株式会社
Yokogawa Electric Corp
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Abstract

A management apparatus, a management method, and wireless communication capable of effectively utilizing communication resources as compared with conventional devices and thereby improving the total number, communication speed, and the like of wireless devices that can enter a wireless network Provide a system.
A system manager serving as a management device manages a wireless network formed by a plurality of wireless devices, and may cause wireless communication interference for each communication link to be set between the wireless devices. An interference determination unit 43a that determines whether or not there is a sex, and a management unit 43b that manages whether or not channels and time slots are allocated to a plurality of communication links according to the determination result of the interference determination unit 43a.
[Selection] Figure 2

Description

  The present invention relates to a management apparatus and management method for managing a wireless network, and a wireless communication system including the apparatus.

  Conventionally, in plants and factories, field devices (measuring instruments, operating devices) called field devices and control devices for controlling these devices are connected via communication means in order to realize advanced automatic operations. A distributed control system (DCS) has been constructed. Most of the communication systems that form the basis of such a distributed control system perform communication by wire, but in recent years, wireless communication that conforms to industrial wireless communication standards such as ISA100.11a and WirelessHART (registered trademark). Something that communicates has also been realized.

  A wireless communication system compliant with these wireless communication standards is provided with a management device called a system manager (or network manager), and communication resources (channels, time slots, etc.) required for wireless communication via a wireless network. ) Management. Specifically, the management device creates a communication schedule in which different timeslots and channels are assigned to each wireless communication performed via the wireless network, and manages the communication resources so that assignment is not duplicated. ing.

  Patent Documents 1 and 2 below disclose an example of a communication resource management method in a conventional wireless communication system. Specifically, Patent Document 1 below discloses a method for creating a periodic communication schedule by assigning communication resources using a communication template called a superframe. Patent Document 2 below discloses a method for reducing interference in a wireless network.

US Pat. No. 7,529,217 JP 2009-89379 A

  By the way, the reason why the conventional management apparatus assigns different communication resources to each of the wireless communications performed via the wireless network is to prevent interference of the wireless communications. Therefore, in order to reliably prevent radio communication interference in situations where radio communication interference may occur (for example, a situation where a plurality of radio devices are arranged in a narrow area and radio signals can be transmitted and received with each other). It is considered necessary to assign different communication resources to all wireless communications.

  However, the conventional management apparatus mechanically assigns different communication resources to all wireless communications performed via the wireless network. For this reason, even if it is clear that interference of wireless communication does not occur due to the directivity of antennas used for wireless communication, the transmission intensity and frequency of wireless signals, the physical arrangement of wireless devices, etc., it differs depending on the management device Communication resources are allocated.

  Here, the number of communication resources that can be used in the wireless communication system is limited, and the total number, communication speed, and the like of wireless devices that can enter the wireless network are limited by the number of communication resources that can be allocated. Conventionally, even when it is clear that interference does not occur, different communication resources are allocated, so communication resources are easily depleted, and a large-scale wireless communication system is constructed, or high-speed wireless communication is performed. There was a problem that it was difficult to realize.

  The present invention has been made in view of the above circumstances, and communication resources can be used more effectively than before, thereby improving the total number and communication speed of wireless devices that can enter a wireless network. An object is to provide a possible management apparatus, management method, and wireless communication system.

In order to solve the above problems, a management apparatus according to the present invention is a management apparatus (40) that manages a wireless network (N1) formed by a plurality of wireless devices (11-13, 21, 22, 31, 32). In this case, for each communication link to be set up between the wireless devices, an interference determination unit (43a) that determines whether or not there is a possibility of interference of wireless communication, and a channel and time according to the determination result of the interference determination unit And a management unit (43b) that manages whether or not slots are allocated to a plurality of communication links.
According to the present invention, the interference determination unit determines whether or not there is a possibility of radio communication interference for each communication link to be set between wireless devices, and a plurality of channels and time slots are determined according to the determination result of the interference determination unit. The management unit manages whether or not to assign redundantly to each communication link.
Further, in the management device of the present invention, the interference determination unit includes an installation position of the wireless device, directivity of a wireless signal transmitted from the wireless device, strength of a wireless signal transmitted from the wireless device, and wireless communication. It is characterized in that the presence / absence of the possibility of interference of the wireless communication is determined using interference determination information (DT) including at least one piece of information indicating the communication quality.
The management apparatus of the present invention further includes a storage unit (42) for storing the interference determination information, and the interference determination unit uses the interference determination information read from the storage unit to perform the wireless determination. It is characterized by determining whether or not there is a possibility of communication interference.
In addition, the management device of the present invention includes a collection unit (43c) that collects the interference determination information and stores it in the storage unit.
Further, in the management device of the present invention, the interference determination unit transmits an installation position of the wireless device included in the interference determination information, directivity of a wireless signal transmitted from the wireless device, and transmitted from the wireless device. Using the information indicating the strength of the wireless signal to create two-dimensional data indicating the reachable area of the wireless signal, creating an interference matrix (M) indicating the presence or absence of interference for each communication link from the two-dimensional data, It is characterized in that it is determined whether or not there is a possibility of interference of the wireless communication based on an interference matrix.
Alternatively, in the management device of the present invention, the interference determination unit creates an interference matrix (M) indicating presence / absence of interference for each communication link from information indicating communication quality of the wireless communication included in the interference determination information. Then, based on the interference matrix, it is determined whether or not there is a possibility of interference of the wireless communication.
In the management apparatus of the present invention, the management unit can assign channels and time slots to a plurality of communication links that are determined by the interference determination unit to have no possibility of radio communication interference. And a plurality of communication links that are determined by the interference determination unit to be likely to cause radio communication interference, and at least one of them is assigned a different channel and time slot.
Alternatively, in the management device of the present invention, a channel that has been assigned to a communication link that has already been set for a communication link that has been determined by the management determination unit as having no possibility of radio communication interference by the interference determination unit. The communication link that has been determined to have the possibility of causing radio communication interference by the interference determination unit can be assigned to the channel and time assigned to the communication link that has already been set. Channels and time slots that are different from at least one of the slots are allocated.
The management method of the present invention is a management method for managing a wireless network (N1) formed by a plurality of wireless devices (11-13, 21, 22, 31, 32), and is set between the wireless devices. The first step (S21) for determining whether or not there is a possibility of radio communication interference for each communication link, and depending on the determination result of the first step, the channel and time slot are duplicated in a plurality of communication links. And a second step (S24) for managing whether or not to assign.
The wireless communication system according to the present invention includes a management device (40) according to any one of the above that manages the wireless network in the wireless communication system (1) capable of wireless communication via the wireless network (N1); And a plurality of wireless devices (11 to 13, 21, 22, 31, 32) that perform wireless communication via the wireless network using a communication link set by the management device.
In the wireless communication system of the present invention, the wireless network is a network in which a plurality of local wireless networks (ST0 to ST2) formed by at least one wireless device are connected to each other by wireless communication. It is a feature.

  According to the present invention, for each communication link to be set between wireless devices, it is determined whether or not there is a possibility of radio communication interference, and is assigned to a communication link that has already been set according to the determination result. Since the management device manages whether or not channels and time slots are assigned to the communication link to be set up redundantly, communication resources can be used more effectively than before, thereby entering the wireless network. There is an effect that it is possible to improve the total number, communication speed, and the like of the wireless devices that can be used.

1 is a block diagram showing an overall configuration of a wireless communication system according to an embodiment of the present invention. It is a block diagram which shows the principal part structure of the system manager as a management apparatus by one Embodiment of this invention. It is a figure which shows an example of the data for interference determination used by one Embodiment of this invention. It is a flowchart which shows the interference matrix preparation operation | movement in one Embodiment of this invention. It is a figure for demonstrating the creation principle of the two-dimensional map performed by one Embodiment of this invention. It is a figure which shows an example of the two-dimensional map created by one Embodiment of this invention. It is a figure which shows an example of the interference matrix produced in one Embodiment of this invention. It is a flowchart which shows the communication resource allocation operation | movement in one Embodiment of this invention. It is a figure which shows an example of the communication resource allocated in one Embodiment of this invention. It is a figure which shows typically the communication resource which can be allocated in one Embodiment of this invention.

  Hereinafter, a management apparatus, a management method, and a wireless communication system according to an embodiment of the present invention will be described in detail with reference to the drawings.

<Overall configuration of wireless communication system>
FIG. 1 is a block diagram showing the overall configuration of a wireless communication system according to an embodiment of the present invention. As shown in FIG. 1, the wireless communication system 1 of this embodiment includes wireless devices 11 to 13 (wireless devices), wireless routers 21 and 22 (wireless devices), backbone routers 31 and 32 (wireless devices), and a system manager 40 ( Management device) and the terminal device 50, wireless communication via the wireless network N1 and wired communication via the backbone network N2 are possible. The wireless communication system 1 is constructed in, for example, a plant, a factory, or the like (hereinafter simply referred to as “plant” when collectively referred to).

  The wireless network N1 is a wireless communication network that is realized by wireless devices (wireless devices 11 to 13, wireless routers 21 and 22, and backbone routers 31 and 32) installed on the plant site and managed by the system manager 40. is there. Note that the number of wireless devices, wireless routers, and backbone routers forming the wireless network N1 is arbitrary.

  Here, the wireless network N1 is divided into a plurality of sites ST0 to ST2 (local wireless network) formed by at least one wireless device. For example, the sites ST1 and ST2 are local wireless networks for mainly transmitting various measurement data (for example, measurement data of temperature, flow rate, pressure, etc.), and the site ST0 is mainly transmitted from the sites ST1 and ST2. It is a local wireless network for collecting various measurement data. That is, the wireless network N1 is configured to be able to collect various measurement data transmitted from the sites ST1 and ST2 arranged around the site ST0 at the center site ST0 when the site ST0 is regarded as the center.

  In the example shown in FIG. 1, the site ST0 is formed by two backbone routers 31 and 32. On the other hand, the site ST1 is formed by one wireless device 11 and one wireless router 21, and the site ST2 is formed by two wireless devices 12, 13 and one wireless router 22. The wireless network N1 is formed by connecting the sites ST0 to ST2 to each other by wireless communication.

  The backbone network N2 is a wired network serving as the backbone of the wireless communication system 1, and the backbone routers 31 and 32, the system manager 40, and the terminal device 50 are connected to the backbone network N2. In this embodiment, an example in which the backbone network N2 is realized by a wired network will be described. However, the backbone network N2 may be realized by a wireless communication network in the same manner as the wireless network N1.

  The wireless devices 11 to 13 are, for example, sensor devices such as flow meters and temperature sensors, valve devices such as flow control valves and on-off valves, actuator devices such as fans and motors, and other wireless field devices installed in plants and factories. Yes, wireless communication conforming to ISA100.11a which is a wireless communication standard for industrial automation is performed. These wireless devices 11 to 13 include omnidirectional antennas 11a to 13a, respectively, and perform wireless communication using the antennas 11a to 13a.

  The wireless routers 21 and 22 are capable of wireless communication based on the wireless communication standard ISA100.11a, and relay data communicated through the wireless network N1. Specifically, the wireless router 21 includes a directional antenna 21 a and an omnidirectional antenna 21 b directed to the backbone router 31, and data transmitted and received between the wireless device 11 and the backbone router 31. Relay. Similarly, the wireless router 22 includes a directional antenna 22 a directed to the backbone router 32 and an omnidirectional antenna 22 b, and is transmitted and received between the wireless devices 12 and 13 and the backbone router 32. Relay data. Note that the wireless routers 21 and 22 periodically transmit advertisements (information necessary for allowing a new wireless device to enter the wireless network N1) under the control of the system manager 40.

  The backbone routers 31 and 32 connect the wireless network N1 and the backbone network N2, and relay various data transmitted and received between the wireless devices 11 to 13 and the system manager 40, for example. The backbone routers 31 and 32 can also perform wireless communication in conformity with the wireless communication standard ISA100.11a. The backbone router 31 includes an antenna 31 a having directivity directed toward the wireless router 21, and the backbone router 32 includes an antenna 32 a having directivity directed toward the wireless router 22.

  The system manager 40 performs overall management control of the wireless communication system 1. For example, the system manager 40 transmits communication resources (channels) to communication links to be set between wireless devices (wireless devices 11 to 13, wireless routers 21 and 22, and backbone routers 31 and 32) connected to the wireless network N1. And a time slot) are allocated to realize wireless communication by TDMA (Time Division Multiple Access) via the wireless network N1. The system manager 40 also performs processing for determining whether or not a new wireless device is allowed to enter the wireless network N1. Details of the system manager 40 will be described later.

  The terminal device 50 is operated by, for example, an administrator (system administrator) of the wireless communication system 1, and is set according to the operation of the system administrator (for example, the system manager 50 is necessary for assigning the communication resources described above). Information setting). The terminal device 50 is realized by, for example, a personal computer or a workstation including an input device such as a keyboard or a pointing device, or a display device such as a liquid crystal display device.

<Configuration of System Manager 40>
FIG. 2 is a block diagram showing a main configuration of a system manager as a management apparatus according to an embodiment of the present invention. As shown in FIG. 2, the system manager 40 includes a communication unit 41, a storage unit 42, and a control unit 43. The communication unit 41 performs communication via the backbone network N2 under the control of the control unit 43.

  The storage unit 42 is realized by an external storage device such as a hard disk, and stores interference determination data DT (interference determination information), an interference matrix M, and the like. Here, the interference determination data DT includes interference of wireless communication performed between wireless devices (wireless devices 11 to 13, wireless routers 21 and 22, and backbone routers 31 and 32) connected to the wireless network N1. Data used as a material for determining the possibility of occurrence. The interference matrix M is generated using the interference determination data DT, and is a table indicating the presence or absence of interference in wireless communication for each combination of wireless devices connected to the wireless network N1 (for each combination of antennas). It is.

  FIG. 3 is a diagram showing an example of interference determination data used in one embodiment of the present invention. In the interference determination data DT shown in FIG. 3A, “coordinate information”, “GPS position information”, “antenna”, “antenna directivity information”, and “transmission intensity information” are defined for each “device”. Data. The “device” is information for specifying a wireless device connected to the wireless network N1. In FIG. 3A, “BBR” means a backbone router, and “RT” means a wireless router. Further, “DEV” in FIG. 3B means a wireless device.

  The “coordinate information” and “GPS position information” are information indicating the installation position of the wireless device. Specifically, the “coordinate information” is information indicating coordinates where a wireless device is installed (design coordinates in a preset XY coordinate system), and the “GPS position information” is GPS (Global Positioning). System: Information indicating a position (latitude and longitude) where a wireless device obtained by the global positioning system is installed. In the present embodiment, it is assumed that the origin of the XY coordinate system is set to the midpoint of the installation positions of the backbone routers 31 and 32 for convenience.

  The “antenna” is information for specifying an antenna provided in a wireless device. Note that “ANT” in FIG. 3 means an antenna. The “antenna directivity information” is information indicating the directivity of an antenna provided in a wireless device. Specifically, this “antenna directivity information” is information including an azimuth angle with north as 0 ° and antenna gain information. The “transmission strength information” is information indicating the transmission strength of a radio signal transmitted from a wireless device.

  The “coordinate information” is set, for example, when the administrator of the wireless communication system 1 operates the terminal device 50. The “GPS position information” is collected from a wireless device having a GPS positioning function by wireless communication via the wireless network N1. The “antenna directivity information” and the “transmission intensity information” are set by the terminal device 50 in the same manner as the “coordinate information”, or each of the “antenna directivity information” and “transmission intensity information” by wireless communication via the wireless network N1 as in the “GPS position information”. Collected from wireless devices.

  The interference determination data DT shown in FIG. 3B includes “frequency (Ch)” and “communication quality information” used for wireless communication for each combination of “transmission device” and “reception device”. It is specified data. The “transmitting device” is information for specifying a wireless device that is a transmission source of a wireless signal, and the “receiving device” is information for specifying a wireless device that is a transmission destination of a wireless signal. The “frequency (Ch)” is information indicating a channel used for wireless communication.

  The “communication quality information” is information indicating the communication quality of wireless communication. As this “communication quality information”, RSSI (Received Signal Strength Indicator), RSQI (Received Signal Quality Indicator), PER (Packet Error Rate), or the like can be used. This “communication quality information” is collected from a wireless device having a reception quality measurement function by wireless communication via the wireless network N1. The wireless device having the reception quality measurement function obtains the “communication quality information” by measuring the reception quality of an advertisement transmitted from the wireless routers 21 and 22, for example.

  The control unit 43 controls the overall operation of the system manager 40. For example, in order to realize TDMA wireless communication via the wireless network N1, communication resources (channels and time slots) are allocated to communication links to be set between wireless devices that perform wireless communication via the wireless network N1. Take control. In addition, when there is a join request (entry request) to the wireless network N1, the control unit 43 performs processing for causing the wireless device that has made the join request to enter the wireless network N1.

  The control unit 43 includes an interference determination unit 43a, a management unit 43b, and a data collection unit 43c. The interference determination unit 43a determines whether or not there is a possibility of wireless communication interference for each communication link to be set between wireless devices that perform wireless communication via the wireless network N1. The interference determination unit 43 a reads the interference determination data DT stored in the storage unit 42, creates an interference matrix M from the interference determination data DT, and radio communication interference occurs based on the generated interference matrix M. Determine the possibility.

  Specifically, the interference determination unit 43a displays “coordinate information” or “GPS position information”, “antenna directivity information”, and “transmission intensity information” included in the interference determination information DT shown in FIG. It is used to create a two-dimensional map (two-dimensional data) indicating the arrival area of the radio signal. Then, an interference matrix M is created from the created two-dimensional map, and whether or not there is a possibility of radio communication interference is determined based on the interference matrix M. Alternatively, the interference determination unit 43a may create an interference matrix M directly from “communication quality information” included in the interference determination information DT shown in FIG. 3B, and interference of wireless communication may occur based on the interference matrix M. Determine the presence or absence of sex. A specific method for creating the two-dimensional map and the interference matrix M will be described later.

  The management unit 43b manages whether or not channels and time slots are allocated to a plurality of communication links in accordance with the determination result of the interference determination unit 43a. Specifically, the management unit 43b can assign channels and time slots in an overlapping manner to a plurality of communication links that have been determined by the interference determination unit 43a that there is no possibility of radio communication interference. On the other hand, at least one of the plurality of communication links determined to have the possibility of causing radio communication interference by the interference determination unit 43a is assigned a channel and a time slot that are different from each other.

  For example, the management unit 43b manages whether a channel and a time slot that are already assigned to a communication link that has already been set are assigned to the communication link that is to be set, according to the determination result of the interference determination unit 43a. To do. Specifically, the management unit 43b duplicates a channel and a time slot assigned to a communication link that has already been set for a communication link that is determined by the interference determination unit 43a to have no possibility of radio communication interference. Can be assigned. On the other hand, the communication link determined by the interference determination unit 43a as having the possibility of causing radio communication interference includes a channel and / or a time slot that is different from at least one of the channels and time slots already assigned to the already set communication link. Assign time slots. The reason why the management unit 43b performs such assignment is to use communication resources more effectively than in the past.

  The data collection unit 43c collects various data by wireless communication with a wireless device via the wireless network N1. For example, the data collection unit 43c collects “GPS position information”, “antenna directivity information”, and “transmission intensity information” included in the interference determination data DT shown in FIG. Alternatively, the data collection unit 43c collects “communication quality information” included in the interference determination data DT shown in FIG.

<Operation of wireless communication system>
Next, communication resource allocation operation in the wireless communication system 1 described above will be described. As described above, the management unit 43b of the device manager 40 manages whether or not to allocate communication resources redundantly according to the determination result of the interference determination unit 43a. For this reason, an operation for creating an interference matrix M used for determination by the interference determination unit 43a (hereinafter referred to as “interference matrix generation operation”) is performed prior to communication resource allocation, and after the creation of the interference matrix M is completed. An operation for actually allocating communication resources (hereinafter referred to as “communication resource allocation operation”) is performed. Hereinafter, these operations will be described in order.

《Interference matrix creation operation》
FIG. 4 is a flowchart showing an interference matrix creation operation in one embodiment of the present invention. Note that the processing of the flowchart illustrated in FIG. 4 is started, for example, at a timing at which the wireless network N1 is constructed, a timing at which the wireless network N1 is changed, a timing at which a wireless device that enters the wireless network N1 is changed, or the like.

  When the processing of the flowchart shown in FIG. 4 is started, first, the control unit 43 performs processing for reading the interference determination data DT stored in the storage unit 42 provided in the system manager 40 to the interference determination unit 43a (step S43). S11). Here, the “device”, “coordinate information”, “antenna”, “antenna directivity information”, and “transmission intensity information” included in the interference determination data DT shown in FIG. Shall.

  Next, the interference determination unit 43a performs a process of creating a two-dimensional map indicating the arrival area of the radio signal using the interference determination data DT read from the storage unit 42 (step S12). FIG. 5 is a diagram for explaining the principle of creating a two-dimensional map performed in one embodiment of the present invention. The planar arrival area of a wireless signal transmitted from a wireless device varies greatly depending on the directivity of an antenna provided in the wireless device.

  Specifically, when the antenna provided in the wireless device is an omnidirectional antenna, the arrival area of the wireless signal is represented by a circular area centered on the wireless device D as shown in FIG. The On the other hand, when the antenna provided in the wireless device is a directional antenna, as shown in FIG. 5 (a), the wireless signal reachable region is an elliptical shape in which the wireless device D is arranged at one of the focal points. The ellipticity (ratio of the length of the major axis to the length of the minor axis) increases as the directivity increases.

  In addition, the reach distance of the radio signal becomes longer as the transmission intensity of the radio signal transmitted from the radio device is higher. For this reason, for example, when the antenna provided in the wireless device is a directional antenna, as shown in FIG. 5B, the wireless signal reachable area represented by an elliptical area has a wireless signal transmission strength. It gets bigger as it gets higher. Although not shown, the wireless signal reachable area (circular area) when the antenna provided in the wireless device is an omnidirectional antenna also increases as the wireless signal transmission strength increases.

  Using the above principle, the interference determination unit 43a creates a two-dimensional map for each of the wireless devices (wireless devices 11 to 13, wireless routers 21 and 22, and backbone routers 31 and 32) provided in the wireless communication system 1. Perform the process. FIG. 6 is a diagram showing an example of a two-dimensional map created in one embodiment of the present invention. 6A is a diagram showing a two-dimensional map for the backbone router 31, and FIG. 6B is a diagram showing a two-dimensional map for the backbone router 32. FIG. 6C is a diagram illustrating a two-dimensional map for the wireless router 21, and FIG. 6D is a diagram illustrating a two-dimensional map for the wireless router 22. The two-dimensional maps for the wireless devices 11 to 13 are not shown for the sake of simplicity of explanation.

  When the creation process of the two-dimensional map is started, first, based on the “coordinate information” included in the interference determination data DT read from the storage unit 42, the wireless device specified by “device” is represented in the XY coordinate system. The process of arranging above is performed by the interference determination unit 43a. Specifically, as shown in FIG. 6, the backbone router 31 is the positive side on the X axis, the backbone router 32 is the negative side on the X axis, the wireless router 21 is the third quadrant of the XY coordinate system, and the wireless router 22 is the XY. A process of arranging each in the fourth quadrant of the coordinate system is performed.

  Next, the arrival of the radio signal transmitted from each wireless device based on the “antenna directivity information” and “transmission strength information” of each wireless device included in the interference determination data DT read from the storage unit 42 A process of creating a two-dimensional map indicating the area is performed by the interference determination unit 43a. Specifically, a wireless signal arrival area whose shape and size are determined by the principle described with reference to FIG. 5 is arranged on the XY coordinate system where the wireless device is arranged to create a two-dimensional map. Is done.

  For example, for the backbone router 31, as shown in FIG. 6A, a two-dimensional map in which an elliptical arrival area R <b> 1 extending from the backbone router 31 toward the wireless router 21 is arranged is created. Similarly, for the backbone router 32, as shown in FIG. 6B, a two-dimensional map in which an elliptical arrival region R2 extending from the backbone router 32 toward the wireless router 22 is arranged is created.

  As for the wireless router 21, as shown in FIG. 6C, an elliptical arrival area R <b> 3 a (from the antenna 21 a) extending from the wireless router 21 toward the backbone router 31 and a circular shape centered on the wireless router 21. A two-dimensional map in which the arrival region R3b (by the antenna 21b) is arranged is created. Similarly, as shown in FIG. 6D, the wireless router 22 has an elliptical arrival area R4a (by the antenna 22a) extending from the wireless router 22 toward the backbone router 32 and a circular shape centered on the wireless router 22. A two-dimensional map in which the arrival area R4b (by the antenna 22b) is arranged is created.

  Subsequently, a process of creating an interference matrix M, which is a table indicating the presence or absence of radio communication interference for each combination of radio devices, from the two-dimensional map created for each radio device is performed by the interference determination unit 43a (step S13). ). Specifically, the presence or absence of radio communication interference is determined according to whether or not other radio devices are included in the radio signal reachable area in the two-dimensional map created for each radio device. Thus, an interference matrix M is created.

  FIG. 7 is a diagram illustrating an example of an interference matrix created in an embodiment of the present invention. As shown in FIG. 7, the interference matrix M includes “transmitting devices” (wireless devices 11 to 13, wireless routers 21 and 22, and backbone routers 31 and 32) and “receiving devices” (wireless devices 11 to 13, wireless routers 21). , 22 and the backbone routers 31 and 32) are tables indicating the presence or absence of interference.

  Referring to the two-dimensional map of FIG. 6A, the elliptical arrival area R1 includes the wireless router 21 in addition to the backbone router 31. For this reason, in the interference matrix M of FIG. 7, when the “transmitting device” is the backbone router (BBR) 31 and the “receiving device” is the wireless router (RT) 21, “interference is present”. It is said that there is no interference for wireless devices. Similarly, referring to the two-dimensional map of FIG. 6B, the elliptical arrival area R2 includes the wireless router 22 in addition to the backbone router 32. For this reason, in the interference matrix M of FIG. 7, when the “transmitting device” is the backbone router (BBR) 32 and the “receiving device” is the wireless router (RT) 22, “interference is present”. It is said that there is no interference for wireless devices.

  Further, referring to the two-dimensional map of FIG. 6C, the elliptical arrival area R <b> 3 a includes the backbone router 31 in addition to the wireless router 21. Although not shown in FIG. 6C, the circular arrival region R3b includes the wireless device 11 in addition to the wireless router 21. Therefore, in the interference matrix M of FIG. 7, when the “transmitting device” is the wireless router (RT) 21 and the “receiving device” is the backbone router (BBR) 31 or the wireless device (DEV) 11, Yes ”and“ no interference ”for other wireless devices.

  In addition, referring to the two-dimensional map of FIG. 6D, the elliptical arrival area R4a includes the backbone router 32 in addition to the wireless router 22. Although not shown in FIG. 6D, the circular arrival region R4b includes the wireless devices 12 and 13 in addition to the wireless router 21. Therefore, in the interference matrix M of FIG. 7, when the “transmitting device” is the wireless router (RT) 22 and the “receiving device” is the backbone router (BBR) 32 or the wireless devices (DEV) 12 and 13. “Interference” is indicated, and “interference” is indicated for other wireless devices.

《Communication resource allocation operation》
FIG. 8 is a flowchart showing a communication resource allocation operation in one embodiment of the present invention. Note that the processing of the flowchart shown in FIG. 8 is started at a timing when the control unit 43 makes a communication link setting request after the above-described interference matrix M is created. In the following description, in order to facilitate understanding, the wireless router 21 and the backbone router are connected from the control unit 43 in a state where communication links among the wireless devices 12 and 13, the wireless router 22, and the backbone router 32 are already set. An example will be described in which there is a request for setting a communication link with the communication link 31 (communication link for transmitting a wireless signal from the backbone router 31 to the wireless router 21).

  When the process of the flowchart shown in FIG. 8 is started, first, referring to the interference matrix M stored in the storage unit 42 provided in the system manager 40, the interference of radio communication is determined for the communication link for which the setting request has been made. Processing for determining presence / absence is performed by the interference determination unit 43a (step S21: first step). Specifically, the interference matrix M shown in FIG. 7 is referred to by the interference determination unit 43a, the “transmission device” is the backbone router (BBR) 31, and the wireless devices (the wireless devices 11 to 13, the wireless router 21, 22, and each of the backbone routers 31 and 32) is determined whether or not there is interference when they are “receiving devices”. In the case of the interference matrix M illustrated in FIG. 7, the wireless router (RT) 21 is determined to have “interference”, and the other wireless devices are determined to have “no interference”.

  Next, based on the determination result of step S21, the management unit 43b performs a process of extracting a wireless device that does not interfere with the communication link to be set (step S22). Here, in step S21, only the wireless router 21 is determined to have “interference”, and wireless devices other than the wireless router 21 are determined to have “no interference”. 11-13, the wireless router 22, and the backbone routers 31, 32) are extracted by the management unit 43b.

  Subsequently, the management unit 43b determines whether there is a communication link that has been set between the wireless devices extracted in step S22 (step S23). As described above, since the communication link among the wireless devices 12, 13, the wireless router 22, and the backbone router 32 has already been set, the determination result in step S23 is “YES”. Then, the process of assigning the channel and time slot assigned to the communication link set between the wireless devices 12 and 13, the wireless router 22, and the backbone router 32 to the communication link to be set is performed by the management unit. 43b (step S24: second step).

  On the other hand, if it is determined that there is no communication link that has been set between the wireless devices extracted in step S22, channels and time slots are assigned to communication links that should be set in the same manner as in the prior art. Processing is performed by the management unit 43b (step S25). Specifically, a process of assigning a channel and a time slot to a communication link to be set is performed so as not to overlap with a channel and a time slot assigned to a communication link that has already been set.

  FIG. 9 is a diagram illustrating an example of communication resources allocated in an embodiment of the present invention. Here, it is assumed that the three communication resources Q1 to Q3 in FIG. 9 have already been allocated before the communication resource allocation operation is started. The communication resource Q1 is a communication resource assigned to a communication link for transmitting a radio signal from the backbone router 32 to the radio router 22, and the communication resource Q2 is a communication for transmitting a radio signal from the radio router 22 to the radio device 12. The communication resource Q3 is a communication resource allocated to the link, and the communication resource Q3 is a communication resource allocated to the communication link that transmits a radio signal from the wireless device 13 to the wireless router 22.

  As a result of the processing in step S24 shown in FIG. 8, any one of the communication resources Q1 to Q3 for the communication link to be set (the communication link for transmitting a radio signal from the backbone router 31 to the wireless router 21) (see FIG. 8). In the example shown in FIG. 9, communication resources Q3) are allocated in duplicate. Note that, when there are a plurality of communication resources that can be allocated redundantly, such as the communication resources Q1 to Q3, the communication resources are allocated according to a predetermined allocation rule and priority.

  Here, referring to FIG. 1, a communication link to be set (a communication link for transmitting a radio signal from the backbone router 31 to the wireless router 21) and a communication link (from the wireless device 13) to which the communication resource Q3 is previously assigned. It is physically separated from a communication link that transmits a wireless signal to the wireless router 22. For this reason, it can be understood that no radio signal interference occurs even if the communication resource Q3 is assigned to the communication link to be set. When the process of step S25 shown in FIG. 8 is performed, a communication resource (for example, communication resource Q4 in FIG. 9) that does not overlap with already assigned communication resources Q1 to Q3 is set for the communication link to be set. Assigned.

  FIG. 10 is a diagram schematically showing communication resources that can be allocated in an embodiment of the present invention. As described above, in the present embodiment, the channel and time slot assigned to the communication link that has already been set can be assigned to the communication link to be set redundantly. As shown in FIG. 10, the assignable communication resources (communication resources RS2 and RS3 in FIG. 10) are newly added to the originally assignable communication resources (communication resource RS1 in FIG. 10). Therefore, communication resources can be used more effectively than before.

  As described above, in the present embodiment, for each communication link to be set between wireless devices, it is determined whether or not there is a possibility of radio communication interference, and the communication link that has already been set is assigned according to the determination result. The system manager 40 manages whether or not the assigned channel and time slot are assigned to the communication link to be set. For this reason, communication resources can be used more effectively than before, and the total number of wireless devices that can enter the wireless network N1, the communication speed, and the like can be improved.

  That is, in the present embodiment, as described with reference to FIG. 10, communication resources RS2 and RS3 that can be allocated are newly added to the original communication resource RS1. For this reason, more communication resources RS2 and RS3 can be used than when only the communication resource RS1 is used, and there is a possibility that more wireless devices can participate in the wireless network N1. In addition, for example, a plurality of communication resources can be assigned to one wireless device, for example, communication resources RS2 and RS3 in addition to the original communication resource RS1 can be assigned to one wireless device, thereby improving the communication speed. It is also possible.

  Although the management apparatus, management method, and wireless communication system according to an embodiment of the present invention have been described above, the present invention is not limited to the above-described embodiment, and can be freely changed within the scope of the present invention. is there. For example, in the above-described embodiment, an example in which a two-dimensional map is created using the interference determination data DT shown in FIG. 3A and the interference matrix M is created from the two-dimensional map has been described, but FIG. It is also possible to create the interference matrix M directly from the interference determination data DT shown in FIG. Further, instead of creating the two-dimensional map shown in FIGS. 5 and 6, two-dimensional data (for example, coordinate data) indicating the arrival area of the radio signal may be created.

  Further, in the above embodiment, in order to facilitate understanding, a new communication link (wireless router 21) is established in a state where communication links among the wireless devices 12, 13, the wireless router 22, and the backbone router 32 have already been set. An example in which channels and time slots are assigned redundantly to the communication link between the network and the backbone router 31 has been described. However, according to the present invention, it is also possible to assign channels and time slots to a plurality of communication links at the same time, for example, as in the case where a whole wireless communication system 1 is newly constructed.

  In the above-described embodiment, an example in which the backbone routers 31 and 32 and the system manager 40 are realized as separate devices has been described. However, any two or more of these devices can be realized as one device. Further, in order to increase the reliability, the system manager 40 may be duplicated for the active system and the standby system. In the above-described embodiment, the wireless communication system that performs wireless communication conforming to ISA100.11a has been described as an example. However, the present invention is also applicable to a wireless communication system that performs wireless communication conforming to WirelessHART (registered trademark). can do.

DESCRIPTION OF SYMBOLS 1 Wireless communication system 11-13 Wireless device 21, 22 Wireless router 31, 32 Backbone router 40 System manager 42 Storage part 43a Interference judgment part 43b Management part 43c Data collection part DT Information for interference judgment M Interference matrix N1 Wireless network ST0-ST2 site

Claims (11)

  1. In a management device that manages a wireless network formed by a plurality of wireless devices,
    For each communication link to be set between the wireless devices, an interference determination unit that determines whether wireless communication interference may occur,
    A management unit that manages whether or not channels and time slots are allocated to a plurality of communication links according to a determination result of the interference determination unit.
  2.   The interference determination unit includes at least one of information indicating an installation position of the wireless device, directivity of a wireless signal transmitted from the wireless device, strength of a wireless signal transmitted from the wireless device, and communication quality of wireless communication. The management apparatus according to claim 1, further comprising: determining whether or not there is a possibility that interference of the wireless communication occurs using interference determination information including two.
  3. A storage unit for storing the interference determination information;
    The management apparatus according to claim 2, wherein the interference determination unit determines whether or not there is a possibility of interference of the wireless communication using the interference determination information read from the storage unit.
  4.   The management apparatus according to claim 3, further comprising a collection unit that collects the interference determination information and stores the collected information in the storage unit.
  5.   The interference determination unit includes information indicating an installation position of the wireless device, directivity of a wireless signal transmitted from the wireless device, and intensity of a wireless signal transmitted from the wireless device included in the interference determination information. To create a two-dimensional data indicating a radio signal arrival area, create an interference matrix indicating the presence or absence of interference for each communication link from the two-dimensional data, and cause interference of the wireless communication based on the interference matrix The management apparatus according to claim 2, wherein presence or absence of possibility is determined.
  6.   The interference determination unit creates an interference matrix indicating presence / absence of interference for each communication link from information indicating communication quality of the wireless communication included in the interference determination information, and based on the interference matrix, the wireless communication The management apparatus according to any one of claims 2 to 4, wherein presence or absence of a possibility of occurrence of interference is determined.
  7.   The management unit can assign a channel and a time slot to a plurality of communication links determined by the interference determination unit as having no possibility of causing radio communication interference. 7. The plurality of communication links determined to have the possibility of communication interference, at least one of which is assigned a different channel and time slot. The management device described.
  8.   The management unit can assign a channel and a time slot that are already assigned to a communication link that has already been set to a communication link that has been determined by the interference determination unit to have no possibility of radio communication interference. The communication link determined by the interference determination unit as having the possibility of causing radio communication interference includes a channel and time different from at least one of the channel and time slot allocated to the already set communication link. The management apparatus according to claim 1, wherein a slot is allocated.
  9. A management method for managing a wireless network formed by a plurality of wireless devices,
    A first step of determining whether or not there is a possibility of radio communication interference for each communication link to be set between the radio devices;
    And a second step of managing whether or not channels and time slots are allocated to a plurality of communication links according to the determination result of the first step.
  10. In a wireless communication system capable of wireless communication via a wireless network,
    The management apparatus according to any one of claims 1 to 8, which manages the wireless network;
    A wireless communication system comprising: a plurality of wireless devices that perform wireless communication via the wireless network using a communication link set by the management device.
  11.   The wireless communication system according to claim 10, wherein the wireless network is a network in which a plurality of local wireless networks formed by at least one wireless device are connected to each other by wireless communication.
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