KR101521233B1 - Apparatus for channel configuration between wireless devices and method thereof - Google Patents

Abstract

The present invention relates to an apparatus for configuring a channel between wireless devices and a method thereof, wherein the apparatus enables to minimize the failure of data transmission caused by the channel congestion and to set the channel which allows to perform stable data communications. The apparatus comprises: an operator terminal which determines the channel congestion through the sensed data traffic, selects the changed channel during the channel congestion, and avoids the channel congestion automatically through the change of the channel; and a client terminal which performs data communications with the operator terminal and changes the channel according to information on the change of the channel transmitted from the operator terminal.

Description

[0001] The present invention relates to a channel setting device and a method thereof,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a channel setting of a radio device, and more particularly, to a channel setting device and a method thereof in a radio device period in which a data transmission failure due to channel congestion is minimized and a channel capable of stable data communication is set.

Generally, a bus is equipped with a boarding and landing terminal for reading a card of a passenger (usually, the boarding terminal is located at a bus riding position and the getting-off terminal is located at a bus riding position) A driver terminal for transferring bus driving information via a bus or transmitting card information of a passenger in real time. Here, the driver terminal can be connected to the wireless device used by the passenger in addition to the boarding and landing terminal. In this case, the driver terminal acts as an access point and serves as a base station for relaying data of the wireless device.

The driver terminal mounted on the bus stores the contents of the transaction every time a fee is collected from the transportation card of the passenger, and transmits the transaction contents to the settlement server (management server) through a wireless LAN or a RAM pack. The contents are settled by each bus and transportation company.

In addition, the driver terminal records bus operation information, wirelessly communicates with the management server periodically or in real time, transmits bus operation information, and receives and stores information necessary for bus operation. Here, the driver terminal usually uses wireless communication using the 2.4G band.

An important consideration when using wireless communication on the bus is that high-speed data transmission should always be done in real time. Here, the high-speed data transmission means that the signal strength indicating sensitivity is -60 dBm or more, the wireless speed is 24 Mbps, and the data transmission speed is 10 Mbps.

To this end, in a general driver terminal, the RSSI of the occupied channel is searched in real time, and if the received signal strength is lower than a predetermined intensity, the channel is immediately changed to another channel. At this time, it takes a considerable time to change the channel, and communication is interrupted when the channel is changed.

A conventional technique for a bus terminal mounted on a vehicle is disclosed in the following Patent Document 1: Korean Patent Laid-Open Publication No. 10-2007-0033941 (published on Mar. 27, 2007).

Patent Document 1 discloses a system for encrypting and binarizing a file that has collected transaction contents collected from at least one bus terminal that has entered a predetermined communication area and transmitting the encrypted and binarized file to a settlement system and storing a version of information stored in the settlement system, The bus terminal is managed by comparing the versions of the information and updating the information stored in the terminal with the latest information.

Korean Patent Publication No. 10-2007-0033941 (published on Mar. 27, 2007)

However, the general driver terminal can relate data to / from the landing / landing terminal, but it is impossible to relay the wireless communication with the wireless device (client terminal) used by the passenger on the bus.

Also, the conventional bus terminal disclosed in Patent Document 1 has a disadvantage in that it is impossible to relay data of other wireless devices used by passengers.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems occurring in a general driver terminal and a conventional bus terminal, and it is an object of the present invention to provide a radio terminal, A channel setting apparatus for a period and a method thereof.

It is another object of the present invention to provide a channel setting apparatus and method for a radio station in which channel congestion is avoided and a channel capable of stable data communication is searched for channel change.

In order to achieve the above-mentioned object, the channel setting device of the radio period of the present invention determines channel congestion through data traffic detection, selects a change channel for channel congestion, and automatically avoids channel congestion A driver terminal; And a client terminal for performing data communication with the driver terminal and changing a channel according to the channel change information transmitted from the driver terminal.

In this case, the driver terminal relays data of a plurality of sub-client terminals.

In this case, the driver terminal transmits the channel change information to the client terminal with a predetermined time delay after changing the channel.

The driver terminal transmits a predetermined amount of data on a current occupancy channel in units of a predetermined time and determines whether or not the channel is congested based on the amount of data returned and the average transmission rate.

The driver terminal monitors a data traffic and generates a channel change request signal in case of channel congestion. A channel congestion monitoring unit for searching for and selecting a channel to be changed according to a channel change request signal generated from the data traffic monitoring unit, and outputting changed channel information and a channel change command; And a radio channel environment controller for changing a channel based on the channel information according to a channel change command output from the channel congestion monitoring unit.

In the above, the channel congestion monitoring unit is characterized by selecting a change channel by setting priorities according to the reception intensity of the search channel, whether or not the channel is used at another access point, and whether or not the search channel is used before and after the change channel is selected .

In the above, the channel congestion monitoring unit selects a channel whose reception intensity is higher than or equal to the threshold value, is not used by other access points, and is not used before and after the channel, and is not used by other access points. Channel is used but a channel having a reception strength of -80 dBm or less is selected as the second rank and a selection channel is selected as a third rank when the channel is used by another access point and the receiving strength is -80 dBm or less, A channel having a reception strength of -80 dBm or less is selected as the fourth rank, a channel having a reception strength of -80 dBm or less and a reception strength of any one of the before and after channels is -80 dBm or less is selected as the fifth rank, The channel having the lowest reception intensity among the channels is selected as the sixth order.

In this case, the radio channel environment control unit transmits a channel change command and channel information to the client terminal with a predetermined time delay after changing the channel.

According to an aspect of the present invention, there is provided a channel setting method for a radio device, the method comprising: (a) monitoring traffic during communication with a specific channel; (b) determining channel congestion based on the monitored traffic; (c) setting a change channel that avoids channel congestion and has no data transmission failure when it is determined to be channel congestion; (d) executing the channel change with the set change channel.

Also, the method for setting a channel period of a radio station according to the present invention may further include: (e) transmitting a channel change command and a changed channel information having a predetermined time delay to the client terminal after changing the channel.

In the above step (c), a channel whose reception strength is equal to or higher than a threshold value, which is not used by another access point, and neither a pre- or post-channel is used is set as a first rank, Channel is set to the second rank and the reception channel is set to the third rank when the channel is used by another access point and the reception strength is -80 dBm or less, A channel having a reception strength of -80 dBm or less is set as a fourth rank, a channel having a reception strength of -80 dBm or less and a reception strength of any one of the before and after channels is -80 dBm or less is set as the fifth rank, The channel having the lowest received signal strength is set to the sixth order.

According to the present invention, channel congestion during a radio period is avoided and a channel capable of stable data communication is searched for and a channel change is automatically performed, thereby providing optimum data communication at all times.

In addition, according to the present invention, an operator terminal serves as an access point of a wireless device (smart phone, notebook, etc.) used by passengers aboard a bus other than a bus terminal.

1 is a configuration diagram of a channel setting device in a radio station according to the present invention;
FIG. 2 is a block diagram of an embodiment of the driver terminal of FIG. 1;
FIG. 3 is a flowchart illustrating a channel setting method in a radio device according to the present invention; FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of a channel setting device in a radio station according to a preferred embodiment of the present invention, and includes an antenna 10, a driver terminal 20, and a client terminal 30.

The antenna 10 transmits / receives wireless data to / from a management server through a base station or the like.

The driver terminal 20 determines channel congestion through data traffic detection, selects a change channel for channel congestion, and automatically avoids channel congestion through channel change. The driver terminal 20 plays a role of relaying data like an ordinary access point (AP).

2, the driver terminal 20 includes a wireless communication unit 21 for communicating data wirelessly with a management server located remotely or for wireless communication with a client, monitoring data traffic, A data traffic monitoring unit 22 for generating a signal, a data traffic monitoring unit 22 for detecting and selecting a channel to be changed according to the channel change request signal, a channel congestion monitoring unit And a radio channel environment control unit 24 for changing a channel based on the channel information according to a channel change command output from the channel congestion monitoring unit 23. [

The channel congestion monitoring unit 23 determines whether or not the reception strength of the search channel is equal to or greater than a preset threshold value and whether or not other access points are used and whether the pre- It is desirable to select a channel.

The client terminal 30 performs data communication with the driver terminal 20 and changes the channel according to the channel change information transmitted from the driver terminal 20. The client terminal 30 is a boarding and landing terminal mounted on a bus or a wireless device such as a smart phone or a notebook used by a passenger on a bus.

The operation of the channel setting device in the radio station according to the present invention will be described in detail as follows.

First, the driver terminal 20 mounted on the bus wirelessly communicates data with a management server or the like located remotely via a specific channel. And communicates with the lower client terminal 30 through a wireless or TCP / IP communication socket.

Here, the driver terminal 20 must maintain the reception sensitivity (reception strength) at -60 dBm or more in order to maintain optimum wireless data communication.

When the communication is performed over the wireless channel, the data traffic monitoring unit 22 monitors the data traffic, and when it is determined that the monitoring result is channel congestion, the data traffic monitoring unit 22 transmits a channel change request signal to the channel congestion monitoring unit 23.

In this case, the channel congestion is determined by transmitting 1 Mbyte of data for 15 seconds in 1 second, measuring the total amount of data returned and the average transmission rate, and determining the total amount of measured data to be 15 Mbytes and 70% . Assuming 70% here, the total amount of data is 10.5 Mbytes and the average transmission speed is 700 Kbps. When the determination criterion is less than 70%, the channel change request signal is generated and transmitted to the channel congestion monitoring unit 23 when the channel change request signal repeats three times or more.

When the channel change request signal is generated, the channel congestion monitoring unit 23 searches for a wireless channel (in particular, a Wi-Fi channel) at intervals of 15 seconds and acquires channel information of a neighbor access point. After the channel search, the signal strength (RSSI) of each channel is stored corresponding to the search channel.

Thereafter, a channel list for the channel to be changed is generated. At this time, the channel list has priority, and the priority is selected as follows.

That is, a channel whose reception intensity of the search channel is equal to or higher than the threshold value (-60 dBm), other access points are not used, and the channels before and after the search channel are not used is selected as the first rank. Then, the other access points are not used, and the front and rear channels are used but the channel having the reception strength of -80 dBm or less is selected as the second rank. In addition, if the selected channel is a channel used by another access point, it is selected as the third rank. If the received strength is less than -80 dBm and the reception strength of the before and after channels is less than -80 dBm, do. In addition, a channel having a reception strength of -80 dBm or less and a reception strength of any of the front and rear channels is -80 dBm or less is selected as the fifth rank, and a channel having the lowest reception strength among the search channels is selected as the sixth rank do.

In this process, the channel list for the channel to be changed is set, and the channel information and the channel change command corresponding to the top rank (corresponding to the first rank) of the set channel list are transmitted to the radio channel environment control unit 24.

The radio channel environment control unit 24 suspends the WiFi communication operation of the radio communication unit 21 according to the transmitted channel change command and changes the radio channel based on the channel information. After changing the channel, communication is resumed to the changed channel.

After changing the wireless channel, the mobile terminal 30 transmits a channel change command and channel information to the client terminal 30 after a predetermined time (for example, 5 seconds). Then, the client terminal 30 changes the channel to the first rank, thereby matching the channel with the driver terminal 20, which is the access point.

Here, the reason why the driver terminal 20 first changes the channel and then changes the channel of the client terminal 30 with a predetermined time delay is that after the driver terminal 20 changes the channel, .

3 is a flowchart illustrating a method of setting a channel in a radio period according to a preferred embodiment of the present invention, wherein S represents a step.

As shown in FIG. 3, (a) monitoring a traffic during a communication on a specific channel (S101 to S102); (b) determining channel congestion based on the monitored traffic (S103); (c) a step (S104) of avoiding channel congestion and setting a change channel in which there is no data transmission failure when it is judged as channel congestion; (d) executing a channel change with the set change channel (S105); (e) transmitting a channel change command and a changed channel information having a predetermined time delay to the client terminal after changing the channel (S106 to S107).

In the method for setting a channel for a radio station according to the present invention configured as described above, traffic is periodically or real-time monitored in step S102 during communication with a specific channel in step S101. Here, the traffic monitoring monitors a traffic by measuring a total amount of data to be returned and an average transmission rate after transmitting a predetermined amount of data (1 Mbyte) a predetermined number of times (1 second).

In step S103, a channel congestion is determined based on the traffic monitoring result. Here, the determination of channel congestion is based on the total amount of measured data of 15 Mbytes and the average transmission rate of 1 Mbps as 70%. Assuming 70% here, the total amount of data is 10.5 Mbytes and the average transmission speed is 700 Kbps. If the criterion is less than 70% and repeats more than 3 times, it is judged as channel congestion.

If it is determined that the channel is congested, the channel is avoided and a change channel in which there is no data transmission failure is set in step S104. Here, the change channel sets a channel whose reception intensity is equal to or higher than the threshold value, the other access point does not use, and the pre / post channel is also not used as the first rank, the other access point does not use, However, a channel having a reception strength of -80 dBm or less is set as the second rank. If the selected channel is a channel used by another access point, it is set to the third rank, and the channel having the reception strength of -80 dBm or less and the reception strength of the before and after channels of -80 dBm or less is set as the fourth rank. In addition, a channel having a reception strength of -80 dBm or less and a reception strength of any one of the before and after channels is -80 dBm or less is set as the fifth rank, and a channel having the lowest reception strength among the search channels is set as the sixth rank .

If the channel to be changed as described above is set, the process moves to step S105 and the channel change is performed to the first rank channel corresponding to the highest rank among the set change channels.

After the change of the channel, the mobile terminal transmits a channel change command and changed channel information to the client terminal in step S107 after having a predetermined time delay (for example, 5 seconds) as in step S106, Ensure that the channel matches the channel.

Thus, by setting a wireless channel capable of always performing the optimum data communication through the traffic monitoring, it is possible to prevent the data transmission failure of the driver terminal and the client terminal, thereby preventing data loss.

Although the present invention has been described in detail with reference to the above embodiments, it is needless to say that the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention.

The present invention is applied to a driver terminal mounted on a bus. In particular, the present invention is effectively applied to a technique of changing a channel between a driver terminal and a client terminal.

10; antenna
20; Driver's terminal
22; The data traffic monitoring unit
23; Channel congestion monitoring unit
24; The wireless channel environment control unit
30; Client terminal

Claims (11)

A driver terminal for determining channel congestion through data traffic detection, automatically selecting a change channel for channel congestion and avoiding channel congestion through channel change;
And a client terminal for performing data communication with the driver terminal and changing a channel according to the channel change information transmitted from the driver terminal,
Wherein the driver terminal monitors a data traffic and generates a channel change request signal upon channel congestion; A channel congestion monitoring unit for searching for and selecting a channel to be changed according to a channel change request signal generated from the data traffic monitoring unit, and outputting changed channel information and a channel change command; And a radio channel environment controller for changing a channel based on the channel information according to a channel change command output from the channel congestion monitoring unit,
The channel congestion monitoring unit selects a channel whose reception strength is equal to or higher than a threshold value and which is not used by any other access point and which does not use the pre- and post-channels as a first rank, and is not used by other access points, A channel having a reception strength of -80 dBm or less is selected as the second rank, a third rank is selected when the selected channel is a channel used by another access point, a reception strength is -80 dBm or less, A channel having a strength of -80 dBm or less is selected as the fourth rank, a channel having a reception strength of -80 dBm or less and a reception strength of any one of the before and after channels is -80 dBm or less is selected as the fifth rank, And a channel having a low reception strength is selected as the sixth order channel.
The apparatus of claim 1, wherein the driver terminal relays data of a plurality of sub-client terminals.
The apparatus of claim 1, wherein the driver terminal transmits channel change information to the client terminal with a predetermined time delay after channel change.
The method of claim 1, wherein the driver terminal transmits a predetermined amount of data on a current occupied channel in units of a predetermined time, and determines whether or not the channel is congested based on the amount of data returned and the average transmission rate. Device.
delete 2. The method of claim 1, wherein the channel congestion monitoring unit is configured to determine a change channel based on a reception strength of a search channel, whether or not a channel of another access point is used, whether to use a channel before and after a search channel, And selecting a change channel by setting a priority order.
delete The apparatus of claim 1, wherein the radio channel environment control unit transmits a channel change command and channel information to the client terminal with a predetermined time delay after the channel change.
(a) monitoring traffic during communication on a specific channel;
(b) determining channel congestion based on the monitored traffic;
(c) setting a change channel that avoids channel congestion and has no data transmission failure when it is determined to be channel congestion;
(d) executing a channel change with the set change channel,
The step (c) sets a channel whose reception intensity is equal to or higher than a threshold value, which is not used by another access point, and which does not use a pre- and post-channel, to a first rank, Is set to the second order when the selected channel is a channel used by another access point and is set to the third order when the selected channel is used by another access point and the receiving strength is set to be lower than -80 dBm, A channel having a reception strength of -80 dBm or less is set as the fourth rank, a channel having a reception strength of -80 dBm or less and a reception strength of any one of the before and after channels is -80 dBm or less is set as the fifth rank, And setting the channel having the lowest reception intensity to the sixth order.
[12] The method of claim 9, further comprising: (e) transmitting a channel change command and a changed channel information having a predetermined time delay to the client terminal after the channel change.
delete

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