KR20130073224A - Method of bluetooth pairing - Google Patents

Abstract

PURPOSE: A method of Bluetooth pairing is provided to increase a success rate in a connection when two or more devices attempt to connect to one target device via Bluetooth. CONSTITUTION: A first connection attempt interval is set (S420). A connection attempting device attempts to connect to a connection target device (S440). If the connection attempt fails, the first connection attempt is repeated a predetermined first number of times after the first connection attempt interval is finished. If the connection attempt fails the predetermined first number of times, a connection attempt is retried after a second connection attempt interval that is longer than the first connection attempt interval is finished. [Reference numerals] (AA) Start; (BB) No; (CC) Yes; (DD) End; (S410) Select a connection target device; (S420) Set a connection attempt interval; (S430) Wait for a predetermined interval; (S440) Connection attempt; (S450) Connection success?

Description

How to set up a Bluetooth connection {Method of Bluetooth pairing}

The present invention relates to a method for establishing a Bluetooth connection, and more particularly, to a method for establishing a Bluetooth connection that can increase a connection success rate when two or more connection attempting devices attempt a Bluetooth connection to one connection target device.

Bluetooth is the industry standard for personal near field communications (PANs), originally developed by Ericsson in 1994. Bluetooth was later formalized by the Bluetooth Special Interest Group (SIG), and Bluetooth, using the IEEE 802.15.1 specification, is the industry standard for personal area networks (PANs). Bluetooth is widely used by a variety of devices because it allows various devices to communicate with each other using radio frequencies that are available worldwide at a safe and low cost.

Typically, the Bluetooth connection attempts to connect to the device to be connected, and if the connection is successful, it can communicate with each other accordingly, but if the connection fails, wait for a certain time and repeat the retry. .

That is, since the connection is abandoned when the connection fails after n or more retries, the success rate is very low when two or more connection attempt devices attempt to access each other at the same time interval at the same time.

The present invention has been made in the technical background as described above, the object of the present invention is to provide a Bluetooth connection method that can increase the connection success rate when two or more connection attempting device attempts a Bluetooth connection to one connection target device. do.

Another object of the present invention is to provide a method of increasing the success rate of a Bluetooth connection to increase the satisfaction of a user of a mobile device including a Bluetooth function.

In order to solve this problem, the present invention increases the probability of connection by actively adjusting the time interval between reconnection attempts when attempting to connect a Bluetooth device.

That is, according to an embodiment of the present invention, a method for establishing a Bluetooth connection may include: setting a first connection attempt interval by a connection attempt device to establish a Bluetooth connection to a connection target device; Attempting to connect to the device, if the connection fails, retrying the connection after the first connection attempt interval elapses for a first predetermined number of times, and the first predetermined number of times the connection is established. If it fails during the time period, retrying the connection after a second connection attempt interval longer than the first connection attempt interval.

According to another aspect of the present invention, there is provided a Bluetooth connection setting method comprising: setting a first connection attempt interval, attempting to connect to the connection target device by the connection attempt device, and when the connection fails, Repeating the connection retrying for a predetermined first number of times after a time elapsed by adding a random increment to the connection attempt interval, and if the connection fails for a predetermined first number of times, the first connection attempt interval. Retrying the connection after a longer second connection attempt interval elapses.

In this case, the increment is preferably smaller than the first connection attempt interval, and the increment has a different value for each connection attempt.

According to the present invention, the connection probability can be increased by actively adjusting the time interval between reconnection attempts, i.e., in the case of successive connection failures, by gradually increasing the interval between connection attempts, unnecessary connection attempts are reduced and incoming connection attempts from the counterpart device are increased. The probability of connection collision can be reduced by adding a random value to each reconnection time point and randomizing the connection time point.

1 schematically shows an entire system in which a Bluetooth connection method according to an embodiment of the present invention is used.
2 is a diagram illustrating a time interval between reconnection attempts used in a Bluetooth connection method according to an embodiment of the present invention.
3 is a diagram illustrating a time interval between reconnection attempts used in a Bluetooth connection method according to another embodiment of the present invention.
4 is a flowchart illustrating a Bluetooth connection method according to an embodiment of the present invention.
FIG. 5 illustrates the connection attempt interval setting step S420 of FIG. 4 in more detail.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. It is noted that the terms "comprises" and / or "comprising" used in the specification are intended to be inclusive in a manner similar to the components, steps, operations, and / Or additions.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the Bluetooth connection method according to an embodiment of the present invention.

1 schematically shows an entire system in which a Bluetooth connection method according to an embodiment of the present invention is used.

1 illustrates a situation in which two or more devices 120 and 130 attempt a Bluetooth connection to one connection target device 110.

In the situation as shown in FIG. 1, if the device B 120 and the device C 130 try to establish a Bluetooth connection to the device A 110 at the same time, both the device B 120 and the device C 130 may fail to connect. Most likely.

If the connection fails, both devices 120 and 130 attempt to reconnect. At this time, if the user attempts to connect again after waiting for a fixed waiting time, the connection attempts from the two devices 120 and 130 again occur. Will crash.

Therefore, in the embodiment of the present invention, the connection probability is increased by allowing each device to actively adjust the time interval between reconnection attempts in the situation as shown in FIG. That is, in determining the delay value used for the N + 1th reconnection, two values of (tN + 1 + tRAND) are determined and used.

First, the tN + 1 value will be described.

In a Bluetooth connection, the probability of success in the reconnection attempt will be highest immediately after a disconnect occurs. In addition, there is a risk that an excessively high frequency of reconnection attempts may cause even normal incoming connection attempts from the counterpart device to fail. In summary, the connection attempt is frequently made at the initial connection attempt, and in the case of successive connection failures, the interval between connection attempts is gradually increased to reduce unnecessary connection attempts and to increase the connection probability of the connection attempt coming from the counterpart device.

2 is a diagram illustrating a time interval between reconnection attempts used in a Bluetooth connection method according to an embodiment of the present invention.

As shown in FIG. 2, a different delta value is used for each reconnection attempt, so that the connection attempt interval between the first part and the second part is different. For example, if the reference interval value is Δn, the values used for n + 1, n + 2, ... will be increased as shown in the following [Table 1]. Can be.

Retries Interval value N + 1 Δn N + 2 Δn N + 3 Δn N + 4 Δn * 2 N + 5 Δn * 2 N + 6 Δn * 2 N + 7 Δn * 3 N + 8 Δn * 3 N + 9 Δn * 3 N + 9 or more Δn * 4

However, Table 1 is presented as a possible embodiment, of course, other values can be used.

The following describes the tRAND value.

If the fixed waiting value is used at the reconnection attempt, the connection can be continuously attempted at the same period with the counterpart device at the same time, and thus a connection failure can occur continuously. Therefore, in order to solve this problem, a random value may be added to each reconnection time point to prevent connection collision.

3 is a diagram illustrating a time interval between reconnection attempts used in a Bluetooth connection method according to another embodiment of the present invention.

As shown in FIG. 3, by adding a random time r1, r2, r3, etc. to tN + 1, which is N + 1 reference times, the final reconnection attempt point is determined to prevent connection collision and increase the possibility of connection.

As shown in FIG. 3, a random value is added to each reconnection attempt time set at regular intervals to prevent connection collision.

As shown in FIG. 3, after the first attempt n fails, the reconnection attempt attempts to reconnect by adding an arbitrary time tRAND to tN + 1 which is N + 1 reference times.

That is, an arbitrary value tRAND can be generated, and in addition to the tN + 1 value determined earlier, the final waiting value tRAND + tN + 1 can be determined.

However, since the determined waiting value should not exceed tN + 2, it is preferable to limit the range of tRAND value to 0 tRAND (tN + 2-tN + 1).

Now with reference to the flowchart attached to the Bluetooth connection method according to an embodiment of the present invention will be described in more detail. 4 is a flowchart illustrating a Bluetooth connection method according to an exemplary embodiment of the present invention, and FIG. 5 is a flowchart illustrating a connection attempt interval setting step S420 of FIG. 4 in more detail.

As shown in FIG. 4, first, when a connection target device is selected (S410), a connection attempt interval is set (S420). Of course, if there is only one device to be connected to the connection target device, this method may be unnecessary.

Referring to FIG. 5 showing the connection attempt interval determining step S420 of FIG. 4 in detail, first, referring to the tN + 1 table (423), tN + 1, which is a reference time of N + 1, is determined (S422). tN + 2 is determined (S424). The determined tN + 2 is referenced when generating tRAND values.

Next, in generating tRAND (S426), tRAND should be set so that the connection attempt interval does not exceed tN + 2 hours with an arbitrary time value to be added to tN + 1 time. That is, 0≤tRAND≤ (tN + 2-tN + 1).

In this way, an interval delay between connection attempts is determined (S428). That is, interval delay = (tN + 1 + tRAND).

Next, after waiting for the set interval (S430), if the time elapsed by the set interval is attempted to reconnect (S440), if the connection fails (No in S450) to set the reconnection attempt interval S420 to S450 Repeat the steps. If the connection is successful (YES in S450), the connection procedure ends.

As described above, in the case of successive connection failures, by increasing the interval between connection attempts gradually, unnecessary connection attempts can be reduced and the connection probability of connection attempts coming from the counterpart device can be increased. In addition, by adding a random value to each reconnection time point to randomize the connection time point, the possibility of connection collision can be reduced.

While the invention has been described in terms of the preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Accordingly, the appended claims are intended to embrace all such modifications and variations as fall within the true spirit of the invention.

Claims (4)

In the method for establishing a Bluetooth connection to the connection target device,
Setting a first connection attempt interval;
The connection attempting device attempting to connect to the connection target device;
If the connection fails, repeating the connection after the first connection attempt interval elapses for a first predetermined number of times;
If the connection fails for a predetermined first number of times, retrying the connection after a second connection attempt interval longer than the first connection attempt interval. In the method for establishing a Bluetooth connection to the connection target device,
Setting a first connection attempt interval;
The connection attempting device attempting to connect to the connection target device;
If the connection fails, retrying the connection for a predetermined first number of times after a time elapsed by adding any increment to the first connection attempt interval;
If the connection fails for a predetermined first number of times, retrying the connection after a second connection attempt interval longer than the first connection attempt interval. The method of claim 2,
The increment is less than the first connection attempt interval. The method of claim 2,
The increment having a different value for each connection attempt.

Images