KR101514714B1 - Devide discovery apparatus and method - Google Patents

Devide discovery apparatus and method Download PDF

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KR101514714B1
KR101514714B1 KR1020130140737A KR20130140737A KR101514714B1 KR 101514714 B1 KR101514714 B1 KR 101514714B1 KR 1020130140737 A KR1020130140737 A KR 1020130140737A KR 20130140737 A KR20130140737 A KR 20130140737A KR 101514714 B1 KR101514714 B1 KR 101514714B1
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message
response
search
controller
queue size
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KR1020130140737A
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Korean (ko)
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고석주
이상헌
최상일
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경북대학교 산학협력단
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information

Abstract

The present invention relates to a device search apparatus and a device search method, and a device search apparatus includes a controller for transmitting a search message including a queue size; And one or more devices responsive to the search message to transmit a response message to the controller at a response time determined from a variable delay time according to a queue size, the controller comprising: a plurality of message queues A device that selectively transmits a response message is added to the search list according to the number of response messages included in the response message, or the queue size is changed to search for the device.

Figure R1020130140737

Description

DEVICE SEARCH DEVICE AND DEVICE SEARCH METHOD [0002] DEVIDE DISCOVERY APPARATUS AND METHOD [

The present invention relates to an apparatus and method for searching for a device. The present invention relates to a high-reliability network and medical information convergence technology research project (task number: 201300270000) for the U-healthcare of the Ministry of Knowledge Economy and a development protocol standard of a light wire protocol for real-time transmission and reception of visible light wireless communication data by the Ministry of Industry & 201311710000). ≪ / RTI >

Generally, a method of using a binary search tree algorithm in searching an illumination device in an illumination control network is known. For example, when a controller determines a search range and multicasts a search message to devices, devices corresponding to the search range transmit a response message to the controller in response to the search message. However, when two or more response messages from the devices are forwarded to the controller at the same response time, the response messages collide on the network path, and the response messages are canceled out to each other to change the message into an unrecognizable message in the controller. In this case, since the search message is repeatedly transmitted while gradually reducing the device search range by using the binary search tree algorithm until one response message arrives at the controller at a specific response time, the time required for device search increases.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a device search apparatus and method capable of reducing device search time.

Another object of the present invention is to provide a device search apparatus and method capable of rapidly and efficiently searching for a device by reducing a collision probability between response messages transmitted from devices to a controller.

The problems to be solved by the present invention are not limited to the above-mentioned problems. Other technical subjects not mentioned will be apparent to those skilled in the art from the description below.

According to an aspect of the present invention, there is provided a device search apparatus including: a controller for transmitting a search message including a queue size; And one or more devices responsive to the search message for transmitting a response message to the controller at a response time determined in a variable delay time according to the queue size, The device that has selectively transmitted the response message is added to the search list according to the number of response messages included in each of the plurality of message queues, and the device is searched by varying the queue size.

In an embodiment of the present invention, the number of message queues constituting the plurality of message queues is variable according to the queue size, and each device stores a response time corresponding to one of the plurality of message queues Lt; / RTI >

In one embodiment of the present invention, the response time of each device may be determined randomly among different response times corresponding to each of the plurality of message queues.

In one embodiment of the present invention, when there is a message queue including a plurality of response messages among the plurality of message queues and there is no message queue including only one response message, Can be increased to search for a device.

In one embodiment of the present invention, when a message queue including only one response message and a message queue including a plurality of response messages exist at the same time from the plurality of message queues, the controller maintains the queue size A device re-search can be performed.

In one embodiment of the present invention, the controller transmits a mute command message to the device that has transmitted the one response message, and the device added to the search list transmits the mute command message to the device And may not transmit a response message to the controller upon device discovery.

In an embodiment of the present invention, when the queue size is d, the number of message queues constituting the plurality of message queues is 2 d , and the delay time may be determined to be a value proportional to 2 d .

In an embodiment of the present invention, when there is a message queue including a plurality of response messages and a message queue including only one response message, the queue size may be increased by one to search for a device. have.

In one embodiment of the present invention, the controller includes: a message transmission unit transmitting the search message to the device and receiving the response message from the device; A device adding unit for selectively adding a device to the search list according to the number of response messages included in each of the plurality of message queues; And a queue size determining unit that selectively varies the queue size according to the number of response messages included in each of the plurality of message queues.

In one embodiment of the present invention, each device includes a message transmission / reception unit receiving the search message and transmitting the response message; A message checking unit for checking a search range in the search message and determining whether the response message is transmitted according to whether the search range corresponds to the search range; And a transmission time determiner for calculating the delay time based on the queue size and randomly determining a response time for transmitting the response message within the delay time.

According to another aspect of the present invention, there is provided a method for transmitting a search message including a queue size to devices and receiving a response message for the search message from one or more devices of the devices Wherein the controller adds the device that transmitted the one response message to the search list if there is a queue containing only one response message among a plurality of message queues classified by the response time of the response message There is provided a device search apparatus for searching for a device by increasing the queue size if a message queue including a plurality of response messages exists and a message queue including only one response message is not present.

According to an embodiment of the present invention, the different message queues include response messages transmitted at different response times determined in the delay time, and the delay time and the number of message queues are variable according to the queue size. .

According to another aspect of the present invention, there is provided a mobile communication system including a message transmission / reception unit receiving a search message including a queue size from a controller and transmitting a response message to the search message to the controller; A message checking unit for checking a search range in the search message and determining whether the response message is transmitted according to whether the search range corresponds to the search range; And a transmission time determining unit for calculating a delay time based on the queue size and determining a response time for transmitting the response message within the delay time, wherein the transmission time determining unit is divided for each response time of the response message There is provided a device for randomly determining a response time corresponding to one message queue among different response times corresponding to each of a plurality of message queues whose number varies according to the queue size.

According to another aspect of the present invention, there is provided a device search method for searching devices connected to a controller by a controller, the controller transmitting a search message including a queue size to the devices ; Sending a response message to the controller at a response time determined by one of the devices in response to the search message and in a variable delay time according to the queue size; And a device search method comprising the step of selectively adding a device to a search list according to the number of response messages of each of a plurality of message queues classified by response time of the response message or searching for a device by increasing the queue size / RTI >

In one embodiment of the present invention, the step of transmitting the response message comprises randomly determining a response time corresponding to any one of the different response times corresponding to each of the plurality of message queues The number of message queues constituting the plurality of message queues may be variable according to the queue size.

According to the embodiment of the present invention, device search time can be reduced.

In addition, according to the embodiment of the present invention, it is possible to quickly and efficiently search devices by reducing the collision probability between the response messages transmitted from the devices to the controller.

The effects of the present invention are not limited to the effects described above. Unless stated, the effects will be apparent to those skilled in the art from the description and the accompanying drawings.

1 is a configuration diagram of a device search apparatus according to an embodiment of the present invention.
2 is a configuration diagram of a controller constituting a device search apparatus according to an embodiment of the present invention.
3 is a configuration diagram of a device constituting a device search apparatus according to an embodiment of the present invention.
FIG. 4 is a flowchart for explaining a device search method according to an embodiment of the present invention, showing the operation of the controller.
5 is a diagram for explaining a device search method according to an embodiment of the present invention.
FIG. 6 is a flowchart for explaining a device search method according to an embodiment of the present invention, showing the operation of the device.

Other advantages and features of the present invention and methods of achieving them will be apparent by referring to the embodiments described hereinafter in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but is only defined by the scope of the claims. Although not defined, all terms (including technical or scientific terms) used herein have the same meaning as commonly accepted by the generic art in the prior art to which this invention belongs. A general description of known configurations may be omitted so as not to obscure the gist of the present invention. In the drawings of the present invention, the same reference numerals are used as many as possible for the same or corresponding configurations.

A device search apparatus according to an exemplary embodiment of the present invention includes a controller for transmitting a discovery message including a queue size; In response to the search message, devices that transmit a response message to the controller at a response time determined from a variable delay time according to a queue size. The controller selectively adds the device to the search list or changes the queue size to search for the device according to the number of response messages included in each of the plurality of message queues classified by the response time of the response message.

The device may send a response message at a response time corresponding to the message queue of any of the plurality of message queues. The response time of the device may be determined randomly among different response times corresponding to each of the plurality of message queues. If the controller fails the device search, it can search the device by increasing the queue size. That is, when there is a message queue including a plurality of response messages among a plurality of message queues and a message queue including only one response message is not present, the controller searches for devices that have transmitted response messages at the same response time To increase the queue size, a search message can be sent and the device can be searched. The number of message queues constituting the plurality of message queues is variable according to the queue size. When the queue size is increased, the response messages from the devices are distributed and transmitted to a larger number of message queues. Accordingly, the probability of collision between response messages transmitted from the devices to the controller can be reduced, and the device search efficiency is improved.

1 is a configuration diagram of a device search apparatus according to an embodiment of the present invention. The device search apparatus 100 includes a controller 110 and a plurality of devices 120. [ The controller 110 and the devices 120 are network connected. Hereinafter, the case where the illumination terminals are searched in the illumination control network (illustratively, the DMX 512-A) will be described as an example, but the device 120 may be a terminal other than the illumination terminal. 1, the devices 120 are grouped into a plurality of search regions R1, R2, and R3, and the controller 110 searches the device 120 for each search region R1, R2, Can be sequentially searched. 1, it is of course possible to simultaneously search the entire devices 120 without grouping them. The various functions and operations of the controller 110 and the device 120 can be performed by one or more processors and memories.

The controller 110 sends a search message to the devices 120 that includes a queue size. The device 120 that is not muted among the devices 120 connected to the controller 110 and satisfies the search range will transmit a response message to the controller 110 in response to the search message. If two or more response messages sent from different devices 120 conflict on a network path, a normal response message may not arrive at the controller 110. The embodiment described below proposes a device search apparatus 100 capable of effectively preventing collision of response messages and capable of performing device search 120 quickly and efficiently.

2 is a configuration diagram of a controller constituting a device search apparatus according to an embodiment of the present invention. 1 and 2, the controller 110 includes a message transmitting unit 111, a device adding unit 112, and a queue size determining unit 113. The message transmission unit 111 transmits a search message to the device 120 and receives a response message from the device 120. [ The search message includes a queue size. The response time for transmitting the response message in the devices 120 is determined according to the queue size. The device 120 will send a response message to the controller 110 at a response time determined randomly among the variable delay times depending on the queue size.

The response messages from the devices 120 sent to the controller 110 at different response times can be divided into a plurality of message queues separated by response times. Different message queues will contain a response message sent at different response times determined within the delay time. At this time, the response time of the device 120 may be randomly determined to be a response time corresponding to one of the different response times corresponding to each of the plurality of message queues.

The device adding unit 112 may add a device that selectively transmits a response message to the search list according to the number of response messages included in each of the plurality of message queues. The device adding unit 112 may add a response message of the corresponding message queue to the discovered device if any message queue including only one response message is included in the plurality of message queues. If a first message queue including only one response message and a second message queue including a plurality of response messages are simultaneously present among the plurality of message queues, the controller 110 transmits the response message to the device As a search list, and transmits a mute command message to the device.

Since the response messages of the second message queue are transmitted in the same response time, the controller 110 changes to a message that can not be recognized by the controller 110 due to the collision between the response messages, and the controller 110 recognizes the devices I will not. Accordingly, the controller 110 performs a device re-search while maintaining the queue size to search again for the devices that transmitted the response message to the same second message queue, that is, the devices that simultaneously transmitted the response message at the same response time . The device already added to the search list will not transmit a response message to the controller 110 at the device re-search according to the mute command message, so that the controller 110 can search for a new device not added to the search list . The controller 110 transmits again a search message to the devices 120 for device re-search and adds a new device 120 to the search list that has sent a response message at a different response time.

The queue size determination unit 113 can selectively change the queue size according to the number of response messages included in each of the plurality of message queues. In one embodiment, when there is a message queue including a plurality of response messages among a plurality of message queues and a message queue including only one response message does not exist, the queue size determination unit 113 increases the queue size The device can be searched. That is, the controller 110 will perform device search by including a larger queue size in the search message.

The delay time and the number of message queues may vary depending on the queue size. For example, increasing the queue size will increase the delay time for all devices 120 to send a response message. That is, the larger the queue size, the longer the delay time, the more response messages will be sent from the devices 120 to the controller 110, and the response messages of the devices 120 will be distributed over longer delay times. The number of message queues constituting a plurality of message queues will also increase in proportion to the delay time when the width of the response time corresponding to one message queue is the same without changing. Thus, by increasing the queue size and thereby increasing the number of message queues, the response messages sent from the devices 120 are also distributed to a greater number of message queues, thereby reducing the probability of collision between response messages, The search can be performed more efficiently.

In addition to the configuration shown in Fig. 2, the controller 110 may further include a memory (not shown). The memory may store information and various programs necessary for executing the functions and operations of the controller 110. [ The memory includes volatile memory such as SRAM (Static RAM), DRAM (Dynamic RAM), and SDRAM (Synchronous DRAM), ROM (Read Only Memory), PROM (Programmable ROM), EPROM (Electrically Programmable ROM) Volatile memory such as a floppy disk, a hard disk, or an optical readable memory such as an electrically erasable and programmable ROM, a flash memory device, a phase-change RAM (PRAM), a magnetic RAM (MRAM), a resistive RAM (RRAM) But is not limited to, a medium such as a CD-ROM, a DVD, or the like.

3 is a configuration diagram of a device constituting a device search apparatus according to an embodiment of the present invention. Referring to FIG. 3, each device 120 includes a message transmission / reception unit 121, a message confirmation unit 122, and a transmission time determination unit 123. The message transmitting / receiving unit 121 receives the search message and transmits the response message. The message checking unit 122 checks the search range in the search message and determines whether or not the response message is transmitted according to whether the search range corresponds to the search range. The message checking unit 122 checks the unique ID number (UID) information of the device 120, transmits a response message when the search range is satisfied, and does not transmit a response message if it does not match the search range. If the message checking unit 122 confirms that the message transmitted from the controller 110 is a mute command message, the device 120 is switched to the mute state and the process is terminated without transmitting the response message. The transmission time determination unit 123 calculates the delay time based on the queue size and randomly determines the response time to transmit the response message within the delay time. This will be described in more detail with reference to Figs. 4 to 6 below.

FIG. 4 is a flowchart for explaining a device search method according to an embodiment of the present invention, showing the operation of the controller. 1 to 4, when the initial search area R1 to be searched for the devices 120 is inputted (step S41), the processes of searching the device in the initial search area R1 (steps S43 to S51) Is performed. When the initial queue size d value is input (step S43), the controller 110 transmits a search message including the initial queue size information to the devices 120 (step S44) (step S45). The response messages will be sequentially transmitted from the devices 120 for a delay time corresponding to the initial queue size. Illustratively, the delay time may be determined to be A * 2 d (A is a constant value that is set in advance) according to the queue size d value.

The response messages from the devices 120 will be distributed to a plurality of message queues of the controller 110 in response time order. The controller 110 determines the number of response messages transmitted from the devices 120 during the delay time for each message queue (steps S46 and S47), and transmits only one response message transmitted from one of the message queues If any message queues are included, the device 120 will be added to the search list (step S48). If there is no message queue including only the response message of one of the message queues and there is a message queue including a plurality of response messages, the controller 110 determines that the queue size is required to be changed (step S49 ).

In step S50, the controller 110 determines the state from the number of response messages for each of the message queues (step S50), stops searching for the initial search area according to the determination result (step S52) The search message is transmitted to perform the device search again (step S44), the queue size is increased, and the device search is performed by transmitting the search message (steps S51 and S44). That is, as shown in FIG. 5 (a), the controller 110 transmits message queues Q11 and Q13 including only one response message and message queues Q12 and Q14 including a plurality of response messages, (Step S44), in order to search for the device 120 which transmitted the response message at the same response time, the device search is performed again while maintaining the queue size. That is, the controller 110 transmits a search message including the same queue size to the devices 120, and the devices 120 send a response message to the controller 110 in response to the search message. The controller 110 may again determine the number of response messages per message queue.

FIG. 5B exemplarily shows a result of searching for the device 120 while maintaining the queue size. As shown in FIG. 5B, there are message queues (Q21, Q22, Q24) including a plurality of response messages among the message queues Q21 to Q24, and a message queue including only one response message In the case of the non-existent state 2, the device can be searched by increasing the queue size (step S51). FIG. 5 (c) shows an exemplary result of searching for the device 120 by increasing the queue size. As shown in FIG. 5 (c), when there is no message queue including a plurality of response messages in the state 0, the controller 110 proceeds to the step of searching for the next search area (step S52) do. When the search for all the search areas is completed (step S42), the device search is finally finished.

FIG. 6 is a flowchart for explaining a device search method according to an embodiment of the present invention, showing the operation of the device. When each device 120 receives a message from the controller 110 (step S61), it checks whether the state of the device 120 is a mute state (step S62). If the device 120 is in a mute state, The process is terminated without confirming the message, and if not, the message is confirmed (step S63). If the message received from the controller 110 is a mute command message, the device 120 changes its state to a mute state (step S64), and transmits a mute response message to the controller 110 ) And then terminates the process. If it is determined in step S63 that the message transmitted from the controller 110 is a search message, the search range is determined (step S66). If the message does not fall within the search range, the response message is not transmitted. If, when the device 120 in step S66 corresponds to the search range, the device 120 determines the response time (step S67), for example, response time is A * rand ()% 2 d (A pre A set constant value, and d is a queue size). Here, rand ()% 2 d means a residual value obtained by dividing a value given as random by 2 d . rand ()% 2 d 2 d is of values (0, 1, 2, ... , 2 d -1) , because of the arbitrary decision as to which one of the value, a response message of the device 120 is d 2 of each other Lt; RTI ID = 0.0 > 2d < / RTI > message queues corresponding to different response times. In step S68, the device 120 transmits a response message to the controller 110 when the response time is determined randomly, and then ends.

Referring again to FIG. 4, if there is a message queue including a plurality of response messages and no message queue including only one response message at step S50, then at step S51, May be increased by one to further explore the device 120. [ By increasing the queue size by one, the number of delay times and the number of message queues doubles, so that the response messages from the devices 120 are distributed to twice the message queues and the collision probability of the response messages is reduced something to do. Accordingly, the devices 120 can be detected quickly and efficiently. According to the embodiment of the present invention, it is possible to quickly and accurately detect the devices 120 connected to the network by generating only a minimum search message without repeatedly transmitting the search message by changing the search range.

It is to be understood that the above-described embodiments are provided to facilitate understanding of the present invention, and do not limit the scope of the present invention, and it is to be understood that various modifications are possible within the scope of the present invention. It is to be understood that the technical scope of the present invention should be determined by the technical idea of the claims and the technical scope of protection of the present invention is not limited to the literary description of the claims, The invention of the present invention.

100: Device search device 110: Controller
111: message transferring unit 112: device adding unit
113: queue size determining unit 120: device
121: message transmission / reception unit 122: message confirmation unit
123: Transmission time determining section

Claims (15)

A controller for transmitting a search message including a queue size; And
And one or more devices responsive to the search message for transmitting a response message to the controller at a response time determined from a variable delay time according to the queue size,
The controller may selectively add a device that transmits the response message to the search list according to the number of response messages included in each of the plurality of message queues classified by the response time of the response message, ≪ / RTI >
Wherein the number of message queues constituting the plurality of message queues is variable according to the queue size,
Each device transmits the response message at a response time corresponding to a message queue of any one of the plurality of message queues. delete The method according to claim 1,
Wherein the response time of each device is determined randomly among different response times corresponding to each of the plurality of message queues. A controller for transmitting a search message including a queue size; And
And one or more devices responsive to the search message for transmitting a response message to the controller at a response time determined from a variable delay time according to the queue size,
The controller may selectively add a device that transmits the response message to the search list according to the number of response messages included in each of the plurality of message queues classified by the response time of the response message, ≪ / RTI >
When there is a message queue including a plurality of response messages among the plurality of message queues and a message queue including only one response message does not exist, the controller increases the queue size to search for a device Device. A controller for transmitting a search message including a queue size; And
And one or more devices responsive to the search message for transmitting a response message to the controller at a response time determined from a variable delay time according to the queue size,
The controller may selectively add a device that transmits the response message to the search list according to the number of response messages included in each of the plurality of message queues classified by the response time of the response message, ≪ / RTI >
Wherein the controller further comprises a device search unit for searching for a device re-search by maintaining the queue size when a message queue including only one response message among the plurality of message queues and a message queue including a plurality of response messages exist at the same time, . 6. The method of claim 5,
Wherein the controller transmits a mute command message to the device that has transmitted the one response message,
Wherein the device added to the search list does not transmit a response message to the controller upon re-searching the device according to the mute command message. 7. The method according to any one of claims 1 to 6,
Wherein when the queue size is d, the number of message queues constituting the plurality of message queues is 2 d , and the delay time is determined to be a value proportional to 2 d . 8. The method of claim 7,
When a message queue including a plurality of response messages exists and a message queue including only one response message does not exist, the device search is performed by increasing the queue size by one. 7. The method according to any one of claims 1 to 6,
The controller comprising:
A message transmission unit transmitting the search message to the device and receiving the response message from the device;
A device adding unit for selectively adding a device to the search list according to the number of response messages included in each of the plurality of message queues; And
And a queue size determining unit that selectively varies the queue size according to the number of response messages included in each of the plurality of message queues. 7. The method according to any one of claims 1 to 6,
Each device,
A message transmission / reception unit receiving the search message and transmitting the response message;
A message checking unit for checking a search range in the search message and determining whether the response message is transmitted according to whether the search range corresponds to the search range; And
And a transmission time determiner for calculating the delay time based on the queue size and randomly determining a response time for transmitting the response message within the delay time. And a controller for transmitting a search message including a queue size to devices and receiving a response message for the search message from one or more devices of the devices,
Wherein the controller adds a device that has transmitted the one response message to a search list when there is a queue including only one response message among a plurality of message queues classified by response time of the response message, If there is no message queue including only one response message, the queue size is increased to search for a device,
The different message queues include response messages sent at different response times determined within the delay time,
Wherein the delay time and the number of message queues are variable according to the queue size. delete A message transmission / reception unit receiving a search message including a queue size from a controller and transmitting a response message to the search message to the controller;
A message checking unit for checking a search range in the search message and determining whether the response message is transmitted according to whether the search range corresponds to the search range; And
And a transmission time determiner for calculating a delay time based on the queue size and determining a response time for transmitting the response message within the delay time,
Wherein the transmission time determination unit determines a response time corresponding to one message queue among the different response times corresponding to the plurality of message queues divided by the response time of the response message and the number of which varies according to the queue size, < / RTI > randomly,
The different message queues include response messages sent at different response times determined within the delay time,
Wherein the delay time and the number of message queues are variable according to the queue size. A device search method for searching devices connected to a controller,
The controller sending a search message including a queue size to the devices;
Sending a response message to the controller at a response time determined by one of the devices in response to the search message and in a variable delay time according to the queue size; And
Adding the device to the search list selectively according to the number of response messages of each of the plurality of message queues classified by the response time of the response message or searching the device by increasing the queue size,
Wherein the step of transmitting the response message randomly determines a response time corresponding to any one of the different response times corresponding to each of the plurality of message queues and transmits the response message, Wherein the number of message queues constituting the plurality of message queues is variable according to the queue size. delete
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CN107255948B (en) * 2017-06-30 2019-10-29 东莞理工学院 A kind of wireless intelligent switch management control method

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