KR101663658B1 - Method for gathering monitoring data, relay apparatus and sensor device - Google Patents
Method for gathering monitoring data, relay apparatus and sensor device Download PDFInfo
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- KR101663658B1 KR101663658B1 KR1020150092388A KR20150092388A KR101663658B1 KR 101663658 B1 KR101663658 B1 KR 101663658B1 KR 1020150092388 A KR1020150092388 A KR 1020150092388A KR 20150092388 A KR20150092388 A KR 20150092388A KR 101663658 B1 KR101663658 B1 KR 101663658B1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/44—Star or tree networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/24—Connectivity information management, e.g. connectivity discovery or connectivity update
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
- H04W72/121—Wireless traffic scheduling for groups of terminals or users
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/04—Terminal devices adapted for relaying to or from another terminal or user
Abstract
A method of collecting monitoring data includes the steps of: a relay device recognizing at least one of the plurality of sensor devices as a first level node through broadcasting of a first signal; Determining a transmission order and a frequency range for each of the plurality of virtual clusters according to the network topology; and determining a transmission order and a frequency range for each of the plurality of virtual clusters according to the network topology, And collecting the monitoring data of the plurality of sensor devices based on a sequence and a frequency range.
Description
The present invention relates to a method for collecting monitoring data attached to an object and generated through monitoring, and a relay device and a sensor device for performing the same.
Recent researches on biochips have been used in various fields such as DNA chip, protein chip and cell chip according to biomaterials, such as biosensor and biomedical chip.
Biochips are able to provide various tools to utilize or control biological functions at the molecular level, and the demand for examination and treatment is increasing due to the connection with the medical institutions through the communication network.
Ubiquitous Health (U-Health) is a representative realization method of ubiquitous IT, reflecting the changes of the times, and it is becoming an industrial area that will enrich human life most dramatically. Ubiquitous health refers to the provision of healthcare services for prevention, diagnosis, and post-treatment management at any time and anywhere by connecting information communication and healthcare. Ubiquitous health is a paradigm that has evolved from the advancement of IT in the industry to the development of E-Health centered on healthcare consumers.
If e-Health means exchanging healthcare information electronically between citizens, patients, healthcare providers, IT providers, and solution providers, ubiquitous health is not limited to the exchange of healthcare information, It is a concept that connects the physical space including the provider and the electronic space of the advanced healthcare technology connected by the network.
If E-Health is an exchange-oriented concept centered on health care providers, U-Health is expanded to a paradigm of connectivity and application, meaning that it is embedded in the lives and care of health care recipients.
Through U-Health, the general public, patients, the disabled, and the elderly can regularly check their health status through various networks of wired and wireless in the home or medical care organization and maintain high level of health through preventive measures. In addition, the medical devices of the healthcare provider are connected to the network, so that the medical staff can more conveniently perform precise diagnosis, treatment, and follow-up management. This will be a fragmentary aspect of U-Health to be developed in the future, and will evolve largely according to the evolution of technology, the maintenance of institutions, and the culture of healthcare utilization.
The biggest feature of U-Health is that it makes the goal of healthcare much more realistic. In recent years, healthcare has been developing with emphasis on safety, efficiency, user-centricity, immediacy, effectiveness and balance. Through U-Health, healthcare can provide appropriate services in a timely manner and at anytime and anywhere. It also reduces time and cost for both health care providers and users, promotes the change of the medical environment from the hospital center to the healthy citizen center, and develops the whole health care process from prevention to diagnosis, treatment, and follow-up in a balanced manner .
The background of the emergence of U-Health is the development of information and communication technology and healthcare technology, the needs of healthcare providers, the increase of demand of healthcare users, the expansion of businesses of service providers and solution providers, .
As the broadband-based network technology evolves, it becomes possible to transmit a large amount of information at a high speed in a wired / wireless communication network, development of multimedia processing and storage technology, radio frequency identification (RFID) The emergence of chips has become a medium for promoting the pioneering of new healthcare domains.
As disease patterns change, new diseases continue, and environmental threats increase, healthcare providers need to integrate a variety of health care information and establish a rapid medical system. It is accelerating the emergence of health.
However, in a telemedicine technique related to U-Health according to the existing telemedicine system, when a plurality of sensors are attached to a user's body, the body sensing data transmitted from the diagnosis system is transmitted to a sensor This is not only about the telemedicine of the sensing data of the fixed user's body sensor, but also the location of the patient when moving in the hospital in the mobility environment. And it is difficult to efficiently manage the transmission of the body sensing data of the patient and various data of the acquired patient.
In this paper, we propose a method of collecting monitoring data by organizing each sensor device into a network topology of a tree structure in a sensor network environment and collecting and managing the monitoring data generated from each sensor device based on the network topology.
In this paper, we propose a method to set up a sensor range for a sensor cluster. We have proposed a sensor cluster that is composed of at least one virtual cluster and a plurality of virtual clusters. The present invention provides a relay apparatus capable of improving the performance of a sensor network environment.
The present invention provides a sensor device capable of configuring its own tier level through communication with a relay device, configuring a virtual cluster, and configuring a network topology of a tree structure.
It is to be understood, however, that the technical scope of the present invention is not limited to the above-described technical problems, and other technical problems may exist.
According to another aspect of the present invention, there is provided a method for collecting monitoring data according to an embodiment of the present invention. The method includes receiving, by broadcasting a first signal, one or more sensor devices of the plurality of sensor devices to a first level node Configuring a network topology based on information about a virtual cluster including the first level node and a second level node that is a peripheral sensor device of the first level node; Determining a transmission order and a frequency range for each of the clusters, and collecting the monitoring data of the plurality of sensor devices based on the transmission order and the frequency range.
According to the present embodiment, the step of recognizing the one or more sensor devices as a first level node comprises the step of causing the relay device to send one or more sensor devices, which are within a predetermined hop distance through broadcasting of the first signal, May be recognized.
According to the present embodiment, the step of configuring the network topology may include: generating a virtual cluster in each of the sensor devices as the first level nodes; And
Each of the first level node sensor devices broadcasts a second signal to recognize surrounding sensor devices as a second level node, and subscribes the sensor device recognized as the second level node to each of the generated virtual clusters Wherein the determining the transmission order and the frequency range comprises scheduling a transmission order for each of the virtual clusters according to the network topology and determining a frequency range for each of the virtual clusters according to the network topology. Wherein the collecting of the monitoring data comprises performing communication between the plurality of sensor devices according to the scheduled transmission order and the allocated frequency range, Through communication with a sensor device that is a node And collecting monitoring data of a plurality of sensor devices on the network topology.
According to the present embodiment, the step of recognizing the first level node may include broadcasting a routing table in which an RSSI threshold value of a parameter corresponding to the hop distance is set, Measuring the reception sensitivity of the signal received from the relay apparatus and recognizing itself as a first level node through comparison between the measured reception sensitivity and the RSSI threshold value set in the routing table.
According to the present embodiment, configuring the network topology of the tree structure may include the steps of: each of the first level node sensor devices broadcasting a second signal to recognize a peripheral sensor device as a second level node; Level node, measuring the reception sensitivity of each of the at least one second signal received by the peripheral sensor devices recognized as the second-level node, measuring the reception sensitivity of the sensor device Selecting a parent node as a parent node and requesting a subscription; and subscribing the sensor device, which is a first-level node that is a parent node receiving the subscription request, to the subscription-requested sensor device to its own virtual cluster have.
According to the present embodiment, the scheduling of the transmission order may include: after the network topology of the tree structure is configured, each sensor device that is the first level node transmits a CSI value indicating the number of sensor devices in its virtual cluster to the relay A step of assigning a virtual cluster number value to each of the virtual clusters on the basis of the CSI value in the relay device, a step of grouping the two virtual clusters based on the assigned virtual cluster number value, And scheduling the transmission order by allocating a transmission period period for transmitting a frame to each of the virtual cluster pairs.
According to the present embodiment, the allocation to each of the virtual clusters may be performed in descending order according to the size of the CSI value, and then the virtual cluster number may be allocated in the ordered order.
According to the present embodiment, in the step of generating the plurality of virtual cluster pairs, the plurality of virtual cluster pairs may be generated by sequentially grouping the two virtual clusters according to the virtual cluster number value.
According to the present embodiment, the transmission date cycling interval is composed of M / 2 superframes, and the scheduling of the transmission order allocates one super frame within each transmission cycle interval to each of the virtual cluster pairs, The order can be scheduled.
According to this embodiment, the superframe includes a lower transmission interval for transmitting uplink data to a sensor device, which is a second level node in the virtual cluster, and a sensor device having a first level node, Wherein the sensor device includes an upper transmission interval for transmitting uplink data to the relay device, and wherein the assigning of the frequency range comprises: selecting one of the virtual clusters as a primary cluster for advancing the upper transmission interval; One virtual cluster different from the frequency range of the band can allocate the frequency range of the secondary band for going through the lower transmission interval.
According to the present embodiment, the step of allocating the frequency range includes searching the frequency range of the primary band and the frequency range of the secondary band during the superframe based on the capacity of the channel for communication, And transmitting the beacon frame including the frequency range to the pair of virtual clusters.
As a technical means for achieving the above technical object, a relay apparatus according to an embodiment of the present invention broadcasts a first signal for recognizing at least one sensor device among sensor devices to a first level node for creation of a virtual cluster A transmission schedule for managing the transmission schedule of each of the virtual clusters based on information of the received virtual cluster after receiving the information of the virtual cluster generated by each of the sensor devices recognized as the first level node, And a frequency allocation unit for allocating a frequency range to each of the management clusters and the virtual clusters.
According to the present embodiment, the transmission schedule management unit may receive the information of the virtual clusters generated by each of the sensor devices recognized as the first level node, and transmit the virtual cluster information to each of the virtual clusters based on the received information of the virtual clusters The frequency allocation unit may allocate a frequency range to each of the virtual clusters to which the transmission date cyclical interval is allocated.
According to the present embodiment, the signal transmitting unit broadcasts the first signal including the routing table in which the RSSI threshold value of the parameter corresponding to the hop distance is set, and each of the sensor devices receiving the first signal transmits the first signal And when the measured reception sensitivity is equal to or greater than the RSSI threshold value, the first level node can be recognized.
According to the present embodiment, the transmission schedule management unit receives a CSI value indicating the number of sensor devices in the virtual cluster from the sensor device recognized as the first level node, and based on the received CSI value, A transmission cycle period can be allocated to the transmission period.
According to an aspect of the present invention, there is provided a sensor device including a signal receiver for receiving a first signal broadcast in the relay device for recognizing a first level node, A level setting unit for setting itself as a first level node when the measured reception sensitivity of the first signal is greater than or equal to a preset first threshold value, And a second signal is generated and broadcasted to neighboring sensor devices. When the registration of the virtual cluster with respect to the sensor devices responding to the second signal is completed, And a virtual cluster generating unit for transmitting the information to the relay device.
According to the present embodiment, the signal receiving unit receives a first signal broadcast in the relay apparatus for recognition of a first level node or a second signal broadcast in a peripheral sensor device for recognition of a second level node Wherein the signal sensitivity measuring unit measures a reception sensitivity of the received first signal or the second signal, and the level setting unit sets the level of the measured signal sensitivity to the measured signal sensitivity, And sets itself as a first level node when the reception sensitivity of the first signal is greater than or equal to a predetermined first threshold value and when the reception sensitivity of the second signal is measured by the signal sensitivity measurement unit, The second sensor node requests the subscription of the virtual cluster generated by the peripheral sensor device broadcasting the second signal Group can be registered in the virtual cluster within the second-level node.
According to this embodiment, when a plurality of second signals are received, the level setting unit may request a subscription to a sensor device that broadcasts a second signal having the highest reception sensitivity among the reception sensitivities of the plurality of second signals have.
The above-described task solution is merely exemplary and should not be construed as limiting the present disclosure. In addition to the exemplary embodiments described above, there may be additional embodiments described in the drawings and the detailed description of the invention.
According to any one of the above-described objects of the present invention, each sensor device is configured in a network topology of a tree structure in a sensor network environment, and then monitoring data generated by monitoring each sensor device based on the network topology is collected and managed, It can improve performance and reduce power consumption compared to the conventional one-hop method.
In addition, according to any one of the above-mentioned objects of the present invention, the sensor diversity is set as at least one virtual cluster, a plurality of virtual clusters are grouped to generate a virtual cluster pair, By allocating the frequency range for enabling the simultaneous transmission of clusters, the performance of the sensor network environment can be improved.
FIG. 1 is a diagram illustrating an overall system configuration of a human body sensor network according to an embodiment of the present invention.
2 is a block diagram illustrating a sensor device according to one embodiment of the present application.
3 is a block diagram illustrating a relay apparatus according to an embodiment of the present invention.
4 is a diagram illustrating a superframe structure of the MWCA according to an embodiment of the present invention.
FIG. 5 is a flowchart schematically illustrating a process of collecting monitoring data generated by a sensor device 100 in a human body sensor network environment according to an embodiment of the present invention.
6A and 6B are flow charts showing the monitoring data collection process of FIG. 5 in detail.
7 is an exemplary diagram illustrating a network topology structure of a tree structure in a multi-hop WBAN configuration approach (MWCA) network environment having a total of 21 devices including a relay device.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It should be understood, however, that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, the same reference numbers are used throughout the specification to refer to the same or like parts.
Throughout this specification, when a part is referred to as being "connected" to another part, it is not limited to a case where it is "directly connected" but also includes the case where it is "electrically connected" do.
Throughout this specification, when a member is " on " another member, it includes not only when the member is in contact with the other member, but also when there is another member between the two members.
Throughout this specification, when an element is referred to as "including " an element, it is understood that the element may include other elements as well, without departing from the other elements unless specifically stated otherwise.
The terms "about "," substantially ", etc. used to the extent that they are used throughout the specification are intended to be taken to mean the approximation of the manufacturing and material tolerances inherent in the stated sense, Accurate or absolute numbers are used to help prevent unauthorized exploitation by unauthorized intruders of the referenced disclosure. The word " step (or step) "or" step "used to the extent that it is used throughout the specification does not mean" step for.
In this specification, the term " part " includes a unit realized by hardware, a unit realized by software, and a unit realized by using both. Further, one unit may be implemented using two or more hardware, or two or more units may be implemented by one hardware. In the present description, some of the operations or functions described as being performed by a terminal, a device, or a device may be performed instead in a server connected to the terminal, device, or device. Likewise, some of the operations or functions described as being performed by the server may also be performed in a terminal, device or device connected to the server. Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a diagram illustrating an overall system configuration of a human body sensor network according to an embodiment of the present invention.
1, the entire system of the human body sensor network may be composed of a plurality of sensor devices 100, a relay device 200 and a user's wireless communication device 250. [
In the entire system of the human body sensor network according to one embodiment of the present invention, the plurality of sensor devices 100 are mounted on a human body in a form capable of sensing and collecting events, body phenomena, (Hereinafter, referred to as 'monitoring data') to the relay apparatus 200. Specifically, the sensor device 100 may be mounted on a part of a human body in wearable or implantable form to generate monitoring data through sensing, and then transmit the monitoring data to the relay device 200.
A plurality of sensor devices 100 according to an embodiment of the present invention may receive a first signal broadcast from the relay device 200 and set its own tier level based on the received first signal. At this time, the sensing device 100 adjacent to the relay device 200 among the plurality of sensor devices 100 sets its own tier level to "1 " (or sets itself to the first level node) , And the sensor device 100 that has created the virtual cluster can select the child node whose tier level is "2 " among the neighboring sensor devices 100 through the broadcasting of the second signal 2 level nodes). At this time, the second signal may be broadcast based on CSMA / CA. At this time, the relay apparatus 200 may mean a 0th level node or a node having a tier level "0 ".
The detailed configuration of the sensor device 100 as described above will be described with reference to FIG.
2 is a block diagram illustrating a sensor device 100 in accordance with one embodiment of the present disclosure.
2, the sensor device 100 may include a signal receiving unit 210, a signal sensitivity measuring unit 220, a level setting unit 230, a virtual cluster generating unit 240, and the like .
The signal receiving unit 210 may receive the signals broadcasted from the relay device 200 or the surrounding sensor device 100, that is, the first and second signals, and provide the signals to the signal sensitivity measuring unit 220. Specifically, the signal receiving unit 210 receives a first signal broadcast in the relay apparatus 200 for recognition of a first level node broadcast in the relay apparatus 200, or a first signal broadcast in the relay apparatus 200, A second signal broadcasted from the sensor device 100, which is recognized as a first level node, and provides the signal to the signal sensitivity measuring unit 220.
The signal sensitivity measuring unit 220 may measure the reception sensitivity of the first signal or the second signal and may provide the measured signal sensitivity to the level setting unit 230.
The level setting unit 230 compares the reception sensitivity of the first signal with the preset first threshold value by receiving the reception sensitivity of the first signal in the signal sensitivity measurement unit 220, Determines its own tier level, receives a reception sensitivity for the second signal, recognizes the node as its own second level node node, requests a subscription to the sensor device 100 broadcasting the second signal You can register yourself.
On the other hand, if the level setting unit 230 receives the reception sensitivity for the plurality of second signals, the level setting unit 230 may subscribe to the sensor device 100 broadcasting the second signal having the highest reception sensitivity among the plurality of reception sensitivities By request, a reliable sensor device 100 can be selected.
The sensor device 100 set to the first level node by the level setting unit 230 generates a virtual cluster using the virtual cluster generating unit 240 and generates a second signal, that is, a routing table including its own tier level , And broadcasts the second signal to the peripheral sensor device 100 based on the CSMA / CA.
In addition, after broadcasting the second signal, the virtual cluster generating unit 240 registers at least one of the neighboring sensor devices 100 as a child node in the virtual cluster through the subscription request from the neighboring sensor device 100 The scale information of the virtual cluster can be transmitted to the relay apparatus 200. [
The relay device 200 is a gateway for transmitting monitoring data to the outside of the body by being attached to a human body in a wearable or implant form and collecting data monitored by the plurality of sensor devices 100, 250 or an external communication medium such as a WBAN, an access point, or a wireless communication base station through the wireless communication device 250 and may transmit the message to an external server (not shown) connected to the Internet.
The relay apparatus 200 according to an exemplary embodiment of the present invention broadcasts a first signal to detect a sensor device 100 having a predetermined radius, for example, within a one-hop distance, as a first level node, The network topology of the tree structure can be configured based on the information about the virtual cluster generated by the plurality of sensor devices 100 set as the node.
The relay apparatus 200 can manage the routing table as shown in Table 1 below.
( DI )
( FI )
( CN )
( CSI )
In Table 1, the depth index (DI) indicates the tier level of the sensor devices 100, and the received signal strength RSS indicates the received signal strength (RSS) from the transmission source when the sensor device 100 senses a signal. And the cluster size index (CSI) of the virtual cluster means the number of nodes in the virtual cluster, that is, the number of the sensor devices 100. The frequency index (FI) is an available frequency range for communication within the virtual cluster, and the virtual cluster number is an integer value for allocating the transmission order to each virtual cluster.
In the routing table, the frequency index and the virtual cluster number can be allocated to each virtual cluster as the scale index of the virtual cluster generated by each of the sensor devices 100, which is the first level node, is received.
The detailed configuration of the relay apparatus 200 as described above will be described with reference to FIG.
3 is a block diagram illustrating a relay apparatus 200 according to an embodiment of the present invention.
3, the relay apparatus 200 may include a signal transmission unit 310, a transmission schedule management unit 320, and a frequency allocation unit 330. As shown in FIG.
The signal transmitting unit 310 may broadcast a first signal for recognizing at least one sensor device 100 among the sensor devices 100 as a first level node for creating a virtual cluster. Specifically, the signal transmitting unit 310 may broadcast a first signal including a routing table in which an RSSI threshold value of a parameter corresponding to a set one-hop distance in the system is set. Each of the sensor devices 100 receiving the first signal can recognize the node as a first level node when the received sensitivity measured after measuring the reception sensitivity of the first signal is equal to or greater than the RSSI threshold value.
The transmission schedule management unit 320 receives the scale information of the virtual clusters generated by each of the sensor devices 100 recognized as the node of the first level node, and transmits the scale information to the virtual cluster based on the scale information of the received virtual cluster. One round of transmission time can be assigned.
As shown in FIG. 4, the transmission schedule cycle unit 320 includes M / 2 superframes, and the transmission schedule management unit 320 determines a transmission schedule according to the size of the virtual cluster, that is, the size of the CSI value Assigning a number (CN) of the virtual cluster, generating a pair of virtual clusters by grouping two virtual clusters in accordance with a number (CN) of the allocated virtual cluster, And the transmission order for the virtual cluster can be scheduled by allocating a frame.
On the other hand, the superframe of the transmission date recurring interval includes a lower transmission interval for transmitting uplink data to the sensor device 100, which is a second level node in the virtual cluster, which is the first level node, Node may include an upper transmission interval for transmitting uplink data to the relay device 200. [
In the lower transmission period of the embodiment of the present invention, the sensor devices 100, which are all second-level nodes in the virtual cluster, sequentially transmit one frame at intervals of MIFS based on the TDMA scheme, After the completion of the transmission, the sensor device 100, which is the first level node, transmits the B-ACK frame with SIFS intervals to notify the sensor devices 100 of the second level node of the transmission confirmation.
After informing the sensor devices 100 of the second level node of the transmission confirmation, the sensor device 100, which is the first level node, notifies the sensor device 100 of the second level node, which is its child nodes during the lower transmission period, And transmits the combined monitoring data to the relay apparatus 200. The relay apparatus 200 receives the monitoring data from the monitoring apparatus 200 via the network.
The frequency allocator 330 may allocate a frequency range to each virtual cluster to which the transmission date interval is allocated. Specifically, the frequency allocator 330 allocates a frequency band of one primary virtual cluster to one of the secondary virtual clusters, Frequency range can be assigned.
On the other hand, the frequency allocator 330 searches the frequency range of the primary band and the secondary band during the superframe on the basis of the capacity of the channel for communication, It can be assigned to the pair.
The wireless communication device 250 is a mobile communication device that is guaranteed to be portable and mobility and can be used as a communication device such as a PCS (Personal Communication System), a GSM (Global System for Mobile communication), a PDC (Personal Digital Cellular), a PHS ), A PDA (Personal Digital Assistant), IMT (International Mobile Telecommunication) -2000, Code Division Multiple Access (CDMA) -2000, W-CDMA (W-Code Division Multiple Access), Wibro (Wireless Broadband Internet) (Smartphone), SmartPad (SmartPad), Tablet PC, and the like.
The wireless communication device 250 according to one embodiment of the present invention can communicate with the relay device 200 in the human body sensor network environment and can receive the monitoring data collected by the relay device 200, The apparatus 200 may be connected to the Internet and the monitoring data collected by the relay apparatus 200 may be transmitted to an external server (not shown). In addition, the wireless communication apparatus 250 can control the relay apparatus 200 as well as transmit data received from the external server to the relay apparatus 200.
A process of collecting the monitoring data generated by the sensor device 100 in the human body sensor network environment as described above will be described with reference to FIG. 5 to FIG. 7. FIG.
FIG. 5 is a flowchart schematically illustrating a process of collecting monitoring data generated by a sensor device 100 in a human body sensor network environment according to an embodiment of the present invention through monitoring. FIGS. 6A and 6B are views FIG. 2 is a flowchart showing a data collecting process in detail. FIG.
As shown in FIG. 5, the process of collecting the monitoring data includes recognizing at least one of the sensor devices 100 as a first level node (S400), configuring a network topology (S410) Determining a frequency range (S420), and collecting monitoring data (S430).
More specifically, a method for collecting monitoring data includes a step (S400) of a relay device recognizing at least one sensor device of the plurality of sensor devices as a first level node through broadcasting of a first signal (S400) (S410) a network topology based on information about a virtual cluster including a second level node that is a peripheral sensor device of a level node, determining a transmission order and a frequency range for each of the plurality of virtual clusters according to the network topology And S430 collecting monitoring data of the plurality of sensor devices based on the transmission order and the frequency range.
Although not shown in FIG. 5, the process of collecting the monitoring data largely includes recognizing at least one of the sensor devices 100 as a first level node, recognizing the first level node as a sensor cluster 100, Configuring the network topology of the tree structure, scheduling the transmission order, allocating the frequency range, and collecting the monitoring data.
Each of the above-described steps will be described in detail with reference to 6a and 6b.
6A and 6B, the relay apparatus 200 broadcasts a first signal including a routing table in which an RSSI threshold value corresponding to a parameter of a predetermined hop distance is set to neighboring sensor devices 100 (S500).
Each of the sensor devices 100 receiving the first signal measures the reception sensitivity of the first signal, e.g., dBM (S502). If the measured reception sensitivity is equal to or greater than the RSSI threshold value in the routing table (S504) It is recognized from the relay apparatus 200 that it is a neighbor node within the one hop node, and the depth index is set to "1" (i.e., the first level node), and then a virtual cluster is created (S506). At this time, the sensor device 100 recognizing the first level node updates its routing table and broadcasts the second signal including the second signal again based on the CSM / CA (S508).
The sensor devices 100 that fail to set the depth index receive a second signal broadcast from the sensor devices 100 corresponding to the nodes of the first level node and set their depth indexes to "2" Level node) (S510).
The sensor devices 100 recognized as a second level node can receive a plurality of second signals. The received signal sensitivity for each of the plurality of second signals is measured (S512), and the measured received signal sensitivity is sorted The sensor device 100 is the first level node that has transmitted the second signal having the highest received signal sensitivity (S514). Then, the sensor device 100, which is recognized as a second level node, transmits a request message for registering itself as a child node to the selected sensor device 100 as a first level node, And joins the virtual cluster generated by the sensor device 100, which is a level node (S516).
Each sensor device 100, which is a first level node, registers the sensor device 100 corresponding to a child node in its virtual cluster through the above-described process. Through this process, a network topology of the tree structure and a virtual cluster are established (S518).
7 is an exemplary diagram illustrating a network topology structure of a tree structure in a multi-hop WBAN configuration approach (MWCA) network environment having a total of 21 devices including the relay apparatus 200. [ In FIG. 7, the circumference circle of the relay apparatus 200 indicates a transmission range of one hop, the devices in the circle are nodes that are first-level nodes, and the child nodes of the first-level nodes are node- admit. Accordingly, the network topology structure of FIG. 7 may be composed of seven nodes of a first level node and nodes of a second level node of thirteen. In addition, since each first level node is a header of a virtual cluster, the total number of virtual clusters becomes 7 equal to the number of nodes of the first level node, and three and four child nodes of i and j virtual clusters Therefore, the scale indexes of i and j virtual clusters are 4 and 5, respectively.
Then, each sensor device 100, which is a first level node, transmits its own virtual cluster information, that is, the scale index of the virtual cluster to the relay device 200 (S520). At this time, the scale index of the virtual cluster may be the number of the sensor devices 100 in the virtual cluster.
The relay apparatus 200 can allocate the frequency index and the number of the virtual cluster based on the scale index of the virtual cluster, and schedule the transmission order on the basis of the frequency index and the number of the virtual cluster. This will be described in detail as follows.
First, the relay apparatus 200 sorts the scale indexes of the virtual clusters in predetermined order, for example, descending order, and allocates the number of the virtual clusters in the order of the descending order (S522).
Thereafter, the relay apparatus 200 can allocate a superframe for frame transmission based on the number of the virtual cluster in the super frame structure of the MWCA. Specifically, the relay apparatus 200 groups two virtual clusters in the order of the number of virtual clusters to generate virtual cluster pairs (S524), and sequentially allocates superframes for frame transmission to the respective virtual cluster pairs (S526). Accordingly, the relay apparatus 200 allocates a superframe to each pair of virtual clusters in such a manner that the pair of the largest virtual cluster allocates the first superframe and the pair of the next largest virtual cluster allocates the second superframe do.
As described above, since a superframe is allocated to a pair of virtual clusters, each virtual cluster in the virtual cluster pair simultaneously transmits data using multi-channel communication. For this reason, it is necessary to allocate two frequency ranges to each super frame do. Specifically, if one virtual cluster in the pair of virtual clusters is traveling in an upper transmission interval with a PR band, the other virtual cluster proceeds in a lower transmission interval with a secondary band, capacity, and searches for two available frequency ranges during the corresponding superframe (S528), and assigns two frequency indices within the beacon frame to provide the pair to the virtual cluster pair (S530).
Accordingly, the sensor device 100 set as the parent node of each virtual cluster collects the monitoring data in the corresponding super frame period, and transmits the collected monitoring data to the relay device 200. Specifically, in the lower transmission period, the sensor devices 100, which are all second-level nodes in the virtual cluster, transmit one frame to the sensor device 100, which is the first-level node, sequentially at intervals of MIFS based on the TDMA scheme After all the transmission is completed, the sensor device 100, which is the first level node, transmits the B-ACK frame with a SIFS interval to inform the sensor devices 100 of the second level node of transmission confirmation. After informing the sensor devices 100 of the second level node of the transmission confirmation, the sensor device 100, which is the first level node, notifies the sensor device 100 of the second level node, which is its child nodes during the lower transmission period, And transmits the monitoring data generated through the monitoring of each sensor device 100 in the virtual cluster to the relay device 200 through the relay device 200 Can be collected in the device 200.
The monitoring data collection method as described above may also be implemented in the form of a recording medium including instructions executable by a computer such as a program module executed by a computer. Computer readable media can be any available media that can be accessed by a computer and includes both volatile and nonvolatile media, removable and non-removable media. In addition, the computer-readable medium can include both computer storage media and communication media. Computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Communication media typically includes any information delivery media, including computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave, or other transport mechanism.
It will be understood by those of ordinary skill in the art that the foregoing description of the embodiments is for illustrative purposes and that those skilled in the art can easily modify the invention without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.
It is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents. .
100: sensor device
200: Relay device
210:
220: Signal sensitivity measuring section
230: Level setting section
240: virtual cluster creation unit
310: Signal transmission unit
320: Transmission schedule manager
330: Frequency allocation unit
Claims (21)
Recognizing at least one of the plurality of sensor devices as a first level node through broadcasting of the first signal by the relay device;
Configuring a network topology based on information about a virtual cluster comprising the first level node and a second level node that is a peripheral sensor device of the first level node;
Determining a transmission order and a frequency range for each of the plurality of virtual clusters according to the network topology; And
And collecting the monitoring data of the plurality of sensor devices based on the transmission order and the frequency range,
Wherein the determining the transmission order and the frequency range comprises:
Receiving information of a virtual cluster generated by each sensor device recognized as the first level node;
Scheduling a transmission order for each of the virtual clusters by allocating a transmission date interval to each of the virtual clusters based on the information of the received virtual clusters; And
And assigning a frequency range to each of the virtual clusters to which the transmission date cyclical interval is allocated.
How to collect monitoring data.
Wherein the step of recognizing the at least one sensor device as a first level node comprises the steps of: recognizing at least one sensor device as a first level node within a predetermined hop distance via broadcasting of the first signal, Data collection method.
Wherein configuring the network topology comprises:
Each of the sensor devices being a first level node creating a virtual cluster; And
Each of the first level node sensor devices broadcasts a second signal to recognize surrounding sensor devices as a second level node, and subscribes the sensor device recognized as the second level node to each of the generated virtual clusters Constructing a network topology of the tree structure,
The step of collecting the monitoring data may include performing communication between the plurality of sensor devices according to the scheduled transmission order and the allocated frequency range, and performing communication with the sensor device that is the first level node And collecting monitoring data of a plurality of sensor devices on the network topology.
The step of recognizing as the first level node
Broadcasting a routing table in which an RSSI threshold value of a parameter corresponding to the hop distance is set;
Measuring a reception sensitivity of a signal received from the relay device by the sensor device receiving the broadcasted routing table; And
And recognizing itself as a first level node through comparison between the measured reception sensitivity and the RSSI threshold value set in the routing table.
The step of configuring the network topology of the tree structure
Each of the sensor devices being a first level node broadcasting a second signal to recognize a peripheral sensor device as a second level node;
Measuring the reception sensitivity of each of the at least one or more second signals broadcasted by the peripheral sensor devices recognized as the second level node;
Selecting one of the sensor devices set as the first level node as a parent node based on reception sensitivity for each of the second signals and requesting subscription; And
The sensor device being a first level node that is a parent node receiving the join request subscribes the join-requested sensor device to its virtual cluster.
The step of scheduling the transmission order
Transmitting a CSI value indicating the number of sensor devices in the virtual cluster to the relay device after each of the sensor devices as the first level node after the network topology of the tree structure is configured;
Assigning a virtual cluster number value to each of the virtual clusters based on the CSI value in the relay apparatus;
Generating a plurality of virtual cluster pairs by grouping the two virtual clusters based on the assigned virtual cluster number value; And
And scheduling the transmission order by allocating a transmission one cycle interval for the frame transmission to each of the virtual cluster pairs.
And assigning the virtual cluster number to each virtual cluster in a descending order according to the size of the CSI value, and allocating the virtual cluster number value in an ordered order.
Wherein the generating of the plurality of virtual cluster pairs comprises sequentially grouping two virtual clusters according to the virtual cluster number value to generate the plurality of virtual cluster pairs.
The transmission date cycling interval is composed of M / 2 super frames,
Wherein the scheduling of the transmission order comprises scheduling the transmission order by allocating one superframe in a transmission cycle interval to each of the virtual cluster pairs.
Wherein the superframe includes a lower transmission interval for transmitting uplink data to a sensor device that is a second level node of the virtual cluster and a sensor device of which the first level node is a sensor node of the second level node, And an upper transmission interval for transmitting uplink data,
Wherein the assigning of the frequency range comprises assigning a frequency band of one of the virtual clusters to a secondary band for advancing the lower transmission interval, Wherein the frequency range of the monitoring data is allocated.
The step of assigning the frequency range
Searching for a frequency range of the primary band and a frequency range of the secondary band during the superframe based on a capacity of a channel for communication; And
Further comprising the step of including the searched frequency range in a beacon frame and sending it to the pair of virtual clusters.
A signal transmitter for broadcasting a first signal for recognizing at least one of the sensor devices as a first level node for creating a virtual cluster;
A transmission schedule manager for receiving information of a virtual cluster generated by each of the sensor devices recognized as the first level node and managing a transmission schedule of each of the virtual clusters based on information of the received virtual cluster; And
And a frequency allocator for allocating a frequency range to each of the virtual clusters,
Wherein the transmission schedule management unit comprises:
Wherein the virtual cluster information is generated by each of the sensor devices recognized as the first level node, and allocates a transmission cycle interval to each of the virtual clusters based on the information of the received virtual cluster,
Wherein the frequency allocator allocates a frequency range to each of the virtual clusters to which the transmission date cyclical interval is allocated,
Relay device.
Wherein the signal transmitter broadcasts the first signal including a routing table in which an RSSI threshold value of a parameter corresponding to a hop distance is set,
Each of the sensor devices receiving the first signal measures reception sensitivity of the first signal and recognizes the first level node when the measured reception sensitivity is equal to or higher than the RSSI threshold value.
Wherein the transmission schedule management unit receives a CSI value indicating the number of sensor devices in the virtual cluster from a sensor device recognized as the first level node and transmits a transmission date range cycle to each of the virtual clusters based on the received CSI value Assigning, relaying device.
The transmission date cycling interval is composed of M / 2 super frames,
Wherein the transmission schedule management unit allocates the number of the virtual cluster according to the size of the CSI value of the virtual cluster, creates a virtual cluster pair by grouping the two according to the number of the allocated virtual cluster, And allocates one superframe within the transmission date cyclic interval.
Wherein the superframe includes a lower transmission interval for transmitting uplink data to a sensor device that is a second level node of the virtual cluster and a sensor device of which the first level node is a sensor node of the second level node, And an upper transmission interval for transmitting uplink data,
Wherein the frequency allocating unit allocates a frequency range of a secondary band for one virtual cluster to a higher frequency band of the primary band for advancing the higher transmission interval Assigning, relaying device.
Wherein the frequency allocator searches a frequency range of the primary band and the secondary band for the superframe based on a capacity of a channel for communication, To the relay device.
A signal receiving unit for receiving a first signal broadcast by the relay apparatus for recognizing a first level node;
A signal sensitivity measuring unit measuring a reception sensitivity of the received first signal;
A level setting unit which sets itself as a first level node when the measured reception sensitivity of the first signal is greater than or equal to a preset first threshold value; And
Generating a second signal by broadcasting to the neighboring sensor devices, and registering the virtual cluster with respect to the sensor devices responding to the second signal, And a virtual cluster generating unit for transmitting information of the virtual cluster to the relay apparatus upon completion,
The relay apparatus includes:
Assigning a transmission period of a transmission period to the virtual cluster based on the information of the virtual cluster and allocating a frequency range to the virtual cluster to which the transmission period interval is allocated,
Sensor device.
Wherein the signal receiver receives a first signal broadcast at the relay device for recognition of a first level node or a second signal broadcast at a peripheral sensor device for recognition of a second level node,
Wherein the signal sensitivity measuring unit measures a reception sensitivity of the received first signal or the second signal,
Wherein the level setting unit sets itself as a first level node when the reception sensitivity of the first signal measured by the signal sensitivity measuring unit is greater than a predetermined first threshold value, Wherein when the reception sensitivity of the second signal is measured by the signal sensitivity measurement unit and the reception sensitivity of the measured second signal is equal to or greater than a predetermined second threshold value, And registers with the second level node in the virtual cluster.
Wherein the level setting unit requests a subscription to a sensor device that broadcasts a second signal having the highest reception sensitivity among the plurality of second signals when the plurality of second signals are received.
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