KR101590417B1 - System and method for setting action mode of wireless personal area network-based device apparatus applied to the same - Google Patents

Abstract

The present invention discloses a system and method for setting an operating mode for a device based on a short-range wireless network, and an apparatus applied thereto. The operation mode setting system for a device based on a short-range wireless network according to the present invention is a system in which a device based on a short-range wireless network actively operates in an active mode (i.e., a wake up mode) As shown in FIG. Accordingly, the present invention can significantly reduce battery consumption by automatically changing the period in which the device actively operates in an active mode (i.e., a wake up mode) or an inactive mode (i.e., a Sleep mode) without the aid of a coordinator device or any base station have.

Power consumption, short-range wireless network

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a system and method for setting an operation mode for a device based on a short-range wireless network,

The present invention relates to a system and method for setting an operation mode for a device based on a short-range wireless network, and a device applied thereto, and more particularly, To a system and method for setting an operation mode for a device based on a short-range wireless network to reduce the frequency of operating in an active mode (i.e., a wake up mode), and an apparatus applied thereto.

In recent years, various types of services have been provided using short-range wireless communication such as WPAN / WLAN (Wireless Personal Area Network / Wireless LAN).

Here, the data communication period between the access point and the end device in which the wireless transmission technology is used carries out data communication using a time concept called a superframe.

IEEE 802.15.4, one of the standards for short-range wireless communication, defines a communication method in a WPAN composed of full function devices (FFD) and reduced function devices (RFD).

In IEEE 802.15.4, a star topology and a peer-to-peer topology operate. In the star topology, one of the full function devices (FFDs) becomes a coordinator device, transmits a beacon signal, and centrally manages other devices Control.

The super frame structure of IEEE 802.15.4 is determined by the coordinator device and informs it via a beacon signal, and the device receiving the beacon signal is in synchronization with the short-range wireless network.

The beacon signal and the next beacon signal are divided into an active section and an inactive section, and the active section is composed of an SD (Superframe Duration) having 16 slots of the same interval. In the active period, a Contention Access Period (CAP) that compares with another device and communicates in a CSMA / CA manner, and a GTS (Guaranteed Time) in which a certain period of a superframe is allocated from the coordinator device for real- (Contention Free Period).

The devices must make a GTS reservation request in the superframe through the CAP to be assigned a GTS. To disable the GTS, you must request separate GTS deallocation.

This GTS deassignment can also be released by the coordinator device in accordance with predetermined rules.

In IEEE 802.15.4, GTS (Guaranteed Time Slot) allocation is determined and the remaining interval is used as CAP. The capacity and usage of GTS determines the superframe of short-range wireless communication, ). ≪ / RTI >

In addition, during BI, the devices operate in an active mode (i.e., awake mode) to receive a beacon signal to maintain this mode for an active period, and in an inactive period to operate in an inactive mode (i.e., a sleep mode).

Accordingly, since the device must continue to operate in the active mode (i.e., the awake mode) in order to receive the beacon signal during the active interval, the battery consumption is increased.

There is a need for measures to solve this problem.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide an apparatus and method for a wireless local area network A system and method for setting an operation mode for a device based on a short-range wireless network to reduce the frequency of operation, and an apparatus applied thereto.

Another object of the present invention is to increase the frequency of operating in an active mode (i.e., a wake up mode) in a period in which a device based on a short-range wireless network actively has a high probability of receiving a beacon signal, A system and method for setting an operation mode for a device based on a short-range wireless network, and a device applied thereto.

According to a first aspect of the present invention, there is provided an operation mode setting system for a short-range wireless network-based device, comprising: a superframe structure for a short- (I.e., sleep mode) for a predetermined period of time, and then switches to an active mode (i.e., a wake up mode) during a period in which the reception probability of the beacon signal is higher than a predetermined level in the superframe structure, And at least one device for synchronizing with the short-range wireless network according to a reception box.

According to a second aspect of the present invention, there is provided a device for accessing a short-range wireless network, the device being located in the short- A storage unit for temporarily storing parameter information to be input to the operation mode switching algorithm, and an inactive mode (i.e., a sleep mode) by activating the operation mode switching algorithm based on the parameter information, (I.e., a wake up mode) from a period in which the reception probability of the beacon signal is higher than a predetermined level in the super frame structure, And a beacon signal receiving unit for receiving a beacon signal .

Preferably, the device further comprises a synchronization unit for synchronizing with the short-range wireless network through the beacon signal.

Preferably, the parameter information includes at least one of a period for scanning the beacon signal, a probability value for scanning the beacon signal in the period, a maximum value for scanning the beacon signal in the period, And a root probability value for updating the probability value.

Preferably, the mode switching unit generates a random number for each period and then switches to the active mode (i.e., the wake up mode) or the inactive mode (i.e., Sleep mode) according to a result of comparing the random number and the probability value, Mode) is continued.

Preferably, the mode switching unit resets the probability value to a value of a first level for receiving the beacon signal when the beacon signal is received in the active mode (i.e., the wake up mode).

Preferably, the value of the first level is

OED_SCAN_ACTV_PRB_NEW = min {OED_SCAN_ACTV_PRB_OLD / OED_SCAN_ROOT_PRB, OED_SCAN_ACTV_PRB_MAX)

(OED_SCAN_ACTV_PRB_NEW: probability value to be reset, OED_SCAN_ACTV_PRB_OLD: previous probability value, OED_SCAN_ROOT_PRB: root probability value, OED_SCAN_ACTV_PRB_MAX: maximum value)

.

Preferably, the mode switching unit resets the probability value and then resumes the active mode (i.e., the wake up mode) to the inactive mode (i.e., the sleep mode).

Preferably, when the beacon signal is not received in the active mode (i.e., the wake up mode), the mode switching unit resets the probability value to a second level value for receiving the beacon signal .

Preferably, the value of the second level is

OED_SCAN_ACTV_PRB_NEW = max {OED_SCAN_ACTV_PRB_OLD / OED_SCAN_ROOT_PRB, OED_SCAN_ACTV_PRB_MIN)

(OED_SCAN_ACTV_PRB_NEW: probability value to be reset, OED_SCAN_ACTV_PRB_OLD: previous probability value, OED_SCAN_ROOT_PRB: root probability value, OED_SCAN_ACTV_PRB_MIN: minimum value)

.

Preferably, the mode switching unit resets the probability value and then resumes the active mode (i.e., the wake up mode) to the inactive mode (i.e., the sleep mode).

According to a third aspect of the present invention, there is provided a method of setting an operation mode of at least one device for connecting to a short-range wireless network, the method comprising the steps of: An operation mode switching algorithm which is an algorithm for controlling an operation mode of the device for receiving the dynamic mode switching algorithm and storing the parameter information for input to the dynamic mode switching algorithm; A mode switching step for switching from an active mode (i.e., a sleep mode) to an active mode (i.e., a wake up mode) during a period in which the reception probability of the beacon signal is higher than a predetermined level in the super frame structure, , A beacon signal for receiving the beacon signal in a wake up mode And a receiving step.

Preferably, the operation mode setting method for the short-range wireless network-based device further includes a synchronization executing step for synchronizing with the short-range wireless network through the beacon signal.

Therefore, in the present invention, by reducing the frequency of operating in an active mode (i.e., a wake up mode) in a section where a device based on a short-range wireless network actively receives a beacon signal, (I.e., Wake up mode) or inactive mode (i.e., Sleep mode) can be automatically changed, thereby greatly reducing battery consumption.

Hereinafter, a preferred embodiment of the operation mode setting system for the device 200 based on the short-range wireless network according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram of an operation mode setting system for a device 200 based on a short-range wireless network according to an embodiment of the present invention. 1, an operation mode setting system for a device 200 based on a short-range wireless network includes at least one device 200 for establishing a short-range wireless network in a local area located in a predetermined area And a coordinator device 100 for processing resources for such a device 200. [

Here, the coordinator apparatus 100 receives content (for example, content for transmission in a broadcasting scheme) for delivering to the near region from the network (e.g., the Internet) and transmits the content to the at least one device 200 in a short-range wireless manner.

To this end, the superframe structure for data communication between the coordinator device 100 and the device 200 is roughly classified into a beacon frame, an active section, and an inactive section.

The superframe structure is intended to allow the contents conveyed from a network (e.g., the Internet) to smoothly transmit the time concept for data communication between the coordinator apparatus 100 and the device 200 to a local area.

In addition, since IEEE 802.15.4, which is one of the standards of short-range wireless communication, is a technology using low power, it is operated by preventing power consumption as much as possible. Therefore, the device 200 included in such a system also operates in a low power mode shall.

Accordingly, the device 200 of the present invention does not operate to receive the beacon signal transmitted from the coordinator device 100 by continuing the active mode (i.e., the wake up mode) in the active period, (I.e., a sleep mode) continuously in a small interval, and then in an active mode (i.e., a wake up mode) when a beacon signal reception probability is high (i.e., a period longer than a predetermined level) after being operated in an inactive mode So that the battery can be efficiently used as the beacon signal is received.

Fig. 2 is a configuration diagram of the device 200 shown in Fig. As shown by way of example only in FIG. 2, the device 200 includes an operation mode switching algorithm, which is an algorithm for executing control of an operation mode for receiving a beacon signal transmitted from the coordinator device 100, A storage unit 210 for previously storing and storing parameter information to be input to the operation mode switching algorithm, an operation mode switching algorithm based on the parameter information stored in the storage unit 210, A mode switching unit 220 for switching to an active mode (i.e., a wake up mode) during a period in which an inactive mode (i.e., a Sleep mode) is continued in a small section and a reception probability of a beacon signal in a superframe structure is equal to or higher than a predetermined level, and A beacon signal receiving unit 230 for scanning a beacon signal received in an active mode (i.e., a wake up mode) The.

Here, the device 200 may further include a synchronization unit 240 for synchronizing with the short-range wireless network through the received beacon signal.

The device 200 is preferably provided with a first beacon signal and a second beacon signal in order to actively switch to an active mode (i.e., a wake up mode) or an inactive mode (i.e., a sleep mode) And the like.

OED_SCAN_ACTV_PRB_OLD (i.e., a previous probability value): a probability value that the device 200 actually scans in the period, OED_SCAN_ACTV_PRB_MAX (i.e., a maximum value), a fixed period in which the device 200 scans the beacon signal, : OED_SCAN_ACTV_PRB_MIN (i.e., a minimum value) to be scanned by the device 200 in a corresponding period; OED_SCAN_ACTV_PRB_NEW (i.e., a reset probability value): OED_SCAN_ACTV_PRB_OLD (i.e., a previous probability value) OED_SCAN_ROOT_PRB (i. E. Source probability value): a source probability value between 0 and 1 for updating the probability that the device 200 actually scans for that period '

Based on the defined variables, the mode switching unit 220 generates a random number between 0 and 1 every cycle, and then compares the generated random number with the previous probability value.

Thereafter, the mode switching unit 220 switches to the active mode (i.e., the wake up mode) or continues the inactive mode (i.e., the sleep mode) according to the comparison result.

For example, when the random number is smaller than the previous probability value, the mode switching unit 220 operates in an active mode (i.e., a wake up mode) to receive a beacon signal. When the random number is larger than the previous probability value (I.e., Sleep mode) since it is unnecessary to cause battery waste.

In the active period, the device 200 may operate in an active mode (i.e., a wake up mode) in a GTS (Guaranteed Time Slot) period other than the reception period of the beacon signal, We will not reflect these considerations for further explanation.

Further, when the mode switching unit 220 succeeds in receiving the beacon signal in the active mode (i.e., the wake up mode), the mode switching unit 220 resets the value of the first level through the following equation (i.e., The beacon signal is reset to a probability that the beacon signal can be easily scanned at a later time.

- a value of the first level (i.e., a probability value to be reset)

OED_SCAN_ACTV_PRB_NEW = min {OED_SCAN_ACTV_PRB_OLD / OED_SCAN_ROOT_PRB, OED_SCAN_ACTV_PRB_MAX)

(OED_SCAN_ACTV_PRB_NEW: probability value to be reset, OED_SCAN_ACTV_PRB_OLD: previous probability value, OED_SCAN_ROOT_PRB: root probability value, OED_SCAN_ACTV_PRB_MAX: maximum value)

Thereafter, the mode switching unit 220 resets the previous probability value and then switches to the inactive mode (i.e., the sleep mode) and continues the inactive mode (i.e., the sleep mode).

If the mode switching unit 220 fails to receive the beacon signal in the active mode (i.e., the wake up mode), the mode switching unit 220 resets the previous probability value to a second level value (i.e., a reset probability value) Thereby increasing the probability of receiving the beacon signal in the future.

- a value of a second level (i.e., a probability value to be reset)

OED_SCAN_ACTV_PRB_NEW = max {OED_SCAN_ACTV_PRB_OLD / OED_SCAN_ROOT_PRB, OED_SCAN_ACTV_PRB_MIN)

(OED_SCAN_ACTV_PRB_NEW: probability value to be reset, OED_SCAN_ACTV_PRB_OLD: previous probability value, OED_SCAN_ROOT_PRB: root probability value, OED_SCAN_ACTV_PRB_MIN: minimum value)

Thereafter, the mode switching unit 220 resets the previous probability value and then switches to the inactive mode (i.e., the sleep mode) and continues the inactive mode (i.e., the sleep mode).

3 is a diagram showing a mode switching state of the device 200 shown in FIG. As shown by way of example only in FIG. 3, device 200 operates through the above-mentioned process and operates in an active mode (i.e., a wake up mode) only during a period when a beacon signal is received, Lt; / RTI > duration in an inactive mode (i. E., Sleep mode).

As a result, the power consumption of the device 200 can be greatly reduced.

FIG. 4 is a flowchart illustrating an operation procedure of the operation mode setting system for the device 200 based on the short-range wireless network shown in FIG. As shown by way of example only in FIG. 4, the method for setting the operation mode for the device 200 based on the short-range wireless network proceeds to the continuous operation of the device 200 in the inactive mode (i.e., the sleep mode) .

Thereafter, the device 200 switches from an inactive mode (i.e., Sleep mode) to an active mode (i.e., a wake up mode) (S3 and S5) when a period in which the reception probability of the beacon signal exceeds a predetermined level comes.

The device 200 in the switched active mode (i.e., the wake up mode) can receive the beacon signal. If the beacon signal is received in this state, the device 200 can increase the reception ratio of the beacon signal (S7 and S9) after switching to a non-active mode (i.e., a sleep mode).

In step S7, even if the device 200 in the active mode (i.e., the wake up mode) succeeds in receiving the beacon signal, the value of the successful reception of the beacon signal in order to efficiently scan in the subsequent beacon signal scanning process Is reset (S11).

Thereafter, the device 200 performs a process for synchronizing with the short-range wireless network through the received beacon signal (S13).

After step S13, the device 200 switches back to the inactive mode (i.e., Sleep mode) and continues (S15).

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that the present invention can be changed.

In addition, since the present invention is intended to reduce the frequency of operating in an active mode (i.e., a wake up mode) in a section where a device based on a short-range wireless network actively receives a beacon signal in a short period, But it is an invention that is industrially applicable because it can be practically carried out clearly.

FIG. 1 is a configuration diagram of an operation mode setting system for a device based on a short-range wireless network according to an embodiment of the present invention;

Fig. 2 is a block diagram of the device shown in Fig. 1,

3 is a diagram showing a mode switching state of the device shown in Fig. 1, and Fig.

4 is a flowchart illustrating an operation of the operation mode setting system for a device based on the short-range wireless network shown in FIG.

Description of the Related Art

100: Coordinator device 200: Device

210: storage unit 220: mode switching unit

230: Beacon signal receiving unit 240:

Claims (13)

delete An operation mode switching algorithm which is an algorithm for controlling an operation mode of the device for receiving a beacon signal located in a near area and a parameter storage for storing parameter information to be input to the operation mode switching algorithm; A mode switching unit for activating the operation mode switching algorithm based on the parameter information and continuing the inactive mode and switching the active mode from a period in which the reception probability of the beacon signal in the super frame structure is equal to or higher than a predetermined level; And And a beacon signal receiver for receiving the beacon signal in the active mode. 3. The apparatus of claim 2, wherein the device And a synchronization unit for synchronizing with the local area wireless network corresponding to the local area through the beacon signal. 4. The method according to claim 2 or 3, A period for scanning the beacon signal, a probability value for scanning the beacon signal in the period, a maximum value for scanning the beacon signal in the period, a minimum value for scanning the beacon signal in the period, And a root probability value for updating the root probability value. 5. The apparatus of claim 4, wherein the mode switching unit (I.e., a sleep mode) according to a result of comparing the random number and the probability value after generating a random number for each period, and continues the inactive mode (i.e., the sleep mode) Device. 5. The apparatus of claim 4, wherein the mode switching unit And resets the probability value to a first level value for receiving the beacon signal when receiving the beacon signal in the active mode (i.e., the Wake up mode). 7. The method of claim 6, wherein the value of the first level OED_SCAN_ACTV_PRB_NEW = min {OED_SCAN_ACTV_PRB_OLD / OED_SCAN_ROOT_PRB, OED_SCAN_ACTV_PRB_MAX) (OED_SCAN_ACTV_PRB_NEW: probability value to be reset, OED_SCAN_ACTV_PRB_OLD: previous probability value, OED_SCAN_ROOT_PRB: root probability value, OED_SCAN_ACTV_PRB_MAX: maximum value) Lt; RTI ID = 0.0 > 1, < / RTI > 7. The apparatus of claim 6, wherein the mode switching unit And resets the active mode (i.e., the wake up mode) to the inactive mode (i.e., the Sleep mode) after resuming the probability value. 5. The apparatus of claim 4, wherein the mode switching unit And resets the probability value to a second level value for receiving the beacon signal if the beacon signal is not received in the active mode (i.e., the Wake up mode). 10. The method of claim 9, wherein the value of the second level OED_SCAN_ACTV_PRB_NEW = max {OED_SCAN_ACTV_PRB_OLD / OED_SCAN_ROOT_PRB, OED_SCAN_ACTV_PRB_MIN) (OED_SCAN_ACTV_PRB_NEW: probability value to be reset, OED_SCAN_ACTV_PRB_OLD: previous probability value, OED_SCAN_ROOT_PRB: root probability value, OED_SCAN_ACTV_PRB_MIN: minimum value) Lt; RTI ID = 0.0 > 1, < / RTI > The apparatus of claim 9, wherein the mode switching unit And resets the active mode (i.e., the wake up mode) to the inactive mode (i.e., the Sleep mode) after resuming the probability value. An operation mode switching algorithm which is an algorithm for controlling an operation mode of a device located in a short range area and at least one device for connecting to a short-range wireless network is located in the short range area and receives a beacon signal; A storage step of storing parameter information for inputting; A mode switching step of activating the operation mode switching algorithm based on the parameter information to switch from an active mode to a active mode in a period in which the reception probability of the beacon signal in the superframe structure is equal to or higher than a predetermined level; And And a beacon signal receiving step of receiving the beacon signal in the active mode. 13. The method of claim 12, wherein the operation mode setting method for the short- And a synchronization executing step for synchronizing with the short-range wireless network through the beacon signal.

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