KR20040075482A - Method for controlling wireless lan communication and apparatus for thereof - Google Patents

Abstract

PURPOSE: A method and apparatus for controlling local area wireless communication are provided to effectively perform information transmission scheduling. CONSTITUTION: The first mobile terminal(100-1) performs local area wireless communication with an AP(Access Point)(110)(S200). The first mobile terminal(100-1) receives a power-saving mode switching request signal(S202). The first mobile terminal(100-1) is switched to a power-saving mode from an active mode and generates a power-saving mode informing signal(S204). The first mobile terminal(100-1) transmits the power-saving mode informing signal to the AP(110)(S206). The AP(110) recognizes that the first mobile terminal(100-1) is in a sleep state(S208). The AP(110) performs an information transmission scheduling except for the first mobile terminal(100-1)(S210). When the first mobile terminal(100-1) receives an active mode switching request signal(S212), it terminates the power-saving mode operation, is switched to the active mode and generates an active mode informing signal(S214). The first mobile terminal(100-1) transmits the active mode informing signal to the AP(110)(S216). The AP(110) recognizes that the first mobile terminal(100-1) is in a wake-up state(S218). The AP(110) performs information transmission scheduling including the first mobile terminal(100-1)(S220).

Description

Near field communication control method and control device {METHOD FOR CONTROLLING WIRELESS LAN COMMUNICATION AND APPARATUS FOR THEREOF}

The present invention relates to a method and a control apparatus for a short range wireless communication, and more particularly, to a short range wireless communication control method and a control apparatus for efficiently performing information transmission scheduling in a short range wireless communication system.

In general, the network is connected to each other by a wire such as a wire or a cable to form a network, but the wired network is difficult to install, maintain, and maintain, and the mobility of each device is difficult. There is this.

Recently, while solving the above problems, interest in low-cost wireless networks is gradually increasing, and many studies are being conducted.

As one example, standards such as IEEE 802.11 in the United States and HiperLAN in Europe and wireless network standards such as Shared Wireless Access Protocol (SWAP) or Bluetooth (Bluetooth) have been published, and wireless networks are commercially available.

The network configuration of the wireless network, that is, the wireless LAN, is largely divided into a DS (Distribute System) method and an Ad-hoc system method.

Here, the AD system is a network system that configures a network using only terminal devices equipped with a wireless LAN card, and has a feature that two-way communication is possible only by installing a wireless LAN card in a home or small office using two or more PCs.

On the other hand, the DS method is operated in a manner similar to a general mobile communication system, a method of controlling all communication between the terminal devices constituting the network in the master device called the base station. In other words, the management network method is to connect a wireless LAN AP (Access Point), which is a base station to an Ethernet port, and to install a wireless LAN card in a plurality of terminals, and uses an existing wired LAN for a conference room, an office, a training center, and the like. Its characteristics are to provide the same network and Ethernet environment.

In the wireless network having the above characteristics, most of the devices, that is, terminal devices, are operated by batteries because of their characteristics, and thus, battery power is required to be saved for long time use.

Accordingly, when there is no data to transmit, each terminal in the wireless network switches to a power saving mode to save battery power.

In this case, when the DS-type terminals switch to the power saving mode, the base station notifies the WLAN AP, which is the base station, to enter the sleep state of the power saving mode, and when necessary, such as a request for transmission from another terminal, The station wakes up the terminal in the sleep state or saves battery power by notifying the other terminal that has made the transmission request that the terminal is currently in the sleep state.

On the other hand, since there is no base station that manages the network in the ad hoc network method, each terminal periodically saves battery power by repeating sleep and wake-up. At this time, each terminal broadcasts its status information to other terminals connected to the network at every period of state transition between sleep and wake-up, so as not to transmit data during the sleep state.

In the prior art DS scheme configured as described above, the base station is notified of the sleep state information from the terminal, but it is difficult to know when the terminal of the sleep state is switched to the wake-up state.

That is, the base station is notified of the fact that the terminal is in the sleep state in order to save battery power, and is not informed of the state information of the transition from the sleep state to the wake-up state.

Accordingly, the conventional wireless network does not accurately recognize the time when the terminal in the sleep state is switched to the wake-up state, and if there is information to be transmitted to the corresponding terminal, the base station does not correctly recognize the information at the time of wake-up of the terminal. There is a problem that cannot be delivered.

In addition, in the conventional wireless network, since the base station needs to store information to be transmitted until the terminal recognizes that the terminal is in a wake-up state, there is a problem in that the hardware burden of the base station occurs.

In addition, in the conventional wireless network, since the base station does not correctly recognize the wake-up time of the terminal, there is a problem that the efficiency of scheduling information transfer of the base station is deteriorated.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to provide a method and control apparatus for short-range wireless communication for efficiently performing information transfer in a short-range wireless communication system.

1 is a view schematically showing a wireless LAN network system according to the present invention.

2 is a view illustrating an operation according to mode switching in a short-range wireless communication system according to the present invention in chronological order.

3 is a diagram illustrating a frame configuration of a power saving mode notification signal.

4 is a diagram illustrating a frame structure of an active mode notification signal.

5 is a flowchart for performing a power saving mode operation of a wireless communication terminal according to the present invention.

6 is a flowchart for performing an active mode operation of a wireless communication terminal according to the present invention.

7 is a flowchart for performing communication control of an access point according to the present invention.

*** Explanation of symbols for main parts of drawing ***

100-1,100-2,100-3: first to third wireless communication terminals

110: access point

The short-range wireless communication control method of a short-range wireless communication system including at least one wireless communication terminal according to the present invention for achieving the above object is an operation mode notification signal for notifying the switch from the power saving mode to the active mode from the wireless communication terminal Determining the active mode switching of the wireless communication terminal according to the received operation mode notification signal, and performing information transmission scheduling including the wireless communication terminal switched to the active mode according to the determination result. There is a characteristic.

Here, according to the result of the determination, the step of performing information delivery scheduling including the wireless communication terminal switched to the active mode may transmit predetermined information to the wireless communication terminal switched to the active mode or receive certain information from the wireless communication terminal. do.

In addition, the operation mode notification signal includes a power processing bit corresponding to the active mode of the wireless communication terminal.

In addition, the wireless communication terminal is a notebook, PDA (PDA) terminal, WAP (WAP) terminal or Bluetooth terminal capable of short-range wireless communication with mobility.

Means for receiving a short-range wireless communication control device for controlling a short-range wireless communication system including at least one wireless communication terminal according to another aspect of the present invention to notify the operation mode notification signal from the wireless communication terminal to inform that the switch from the power saving mode to the active mode And means for determining an active mode change of the wireless communication terminal according to the received operation mode notification signal and means for performing information transmission scheduling including the wireless communication terminal switched to the active mode according to the determination result.

In this manner, the operation mode switching time can be accurately recognized by the operation mode notification signal, and information delivery scheduling can be performed accordingly.

Hereinafter, a communication control method of a wireless communication system according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view schematically showing a wireless LAN network system according to an embodiment of the present invention.

As shown in FIG. 1, a wireless LAN network system according to an embodiment of the present invention includes a first to third wireless communication terminals 100-1, 100-2, 100-3, and first to third mobile devices capable of short-range wireless communication. It includes an access point (110) that performs resource allocation and information transfer to the third wireless communication terminal (100-1, 100-2, 100-3).

Here, the WLAN network is based on a cellular structure divided into cells, and a cell, which is a basic network unit, is called a basic service set (BSS). The first to third wireless communication terminals 100-1, 100-2, and 100-3 and the access point 110 are components of the BBS.

The first to third wireless communication terminals 100-1, 100-2, and 100-3 are mobile communication terminals having a built-in wireless LAN card for short-range wireless communication, for example, notebook computers, personal digital assistants (PDAs). Or a wireless application protocol (WAP) terminal. In this case, since the first to third wireless communication terminals 100-1, 100-2, and 100-3 have mobility, they are operated by battery power.

The access point 110 is a base station for controlling the first to third wireless communication terminals 100-1, 100-2, and 100-3, and an external network such as IDSN, ATM, or T1, and a local Ethernet backbone. (Ethernet Backbone) Connected to the network.

The operation of the WLAN network system according to the present invention configured as described above is as follows.

The access point 110 transmits the information received through the Internet or an Ethernet network to the first to third wireless communication terminals 100-1, 100-2, and 100-3.

That is, the access point 110 transmits information received from the outside to the first to third wireless communication terminals 100-1, 100-2, and 100-3 through the Internet, or from a wireless communication terminal in another BBS through an Ethernet network. The received information to the first to third wireless communication terminals 100-1, 100-2, and 100-3.

In addition, the access point 110 transmits the information received from one wireless communication terminal in the BBS which is its communication management range to the other wireless communication terminal. For example, the access point 110 also transmits the information received from the first wireless communication terminal 100-1 to the second wireless communication terminal 100-2.

As such, the first to third wireless communication terminals 100-1, 100-2, and 100-3 that receive or transmit information through the access point 110 are in a wake-up state operated in an active mode.

Meanwhile, when the first to third wireless communication terminals 100-1, 100-2, and 100-3 do not transmit or receive information for a predetermined time, when the request signal is input by the user of the communication terminal, battery power is saved. It is operated in a power saving mode. In this case, the first to third wireless communication terminals 100-1, 100-2, and 100-3 operating in the power saving mode are in a sleep state.

In this case, when the first to third wireless communication terminals 100-1, 100-2, and 100-3 switch to the wake-up state or the sleep state, the first to third wireless communication terminals 100-1, 100-2, and 100-3 transmit information frames indicating a state transition to the access point 110. send.

As described above, the operation of the short range wireless communication system according to the operation mode switching of the first to third wireless communication terminals will be described in detail with reference to FIG. 2.

2 is a view showing the operation according to the mode switching in the short-range wireless communication system according to the present invention in chronological order, Figure 3 is a view showing the frame configuration of the power saving mode notification signal, Figure 4 is a frame configuration of the active mode notification signal It is a diagram showing.

First, the first wireless communication terminal 100-1 performs short range wireless communication with the access point 110 (S200). That is, the first wireless communication terminal 100-1 receives information from the access point 110 or transmits information to the second and third wireless communication terminals 100-2 and 100-3 through the access point 110. do. At this time, the first wireless communication terminal 100-1 is in the wake-up state of the active mode.

Subsequently, the first wireless communication terminal 100-1 is operated in a power saving mode to save battery power when the reception and transmission of information does not occur for a predetermined time.

That is, in the power saving mode operation of the first wireless communication terminal 100-1, a power saving mode switch request signal according to a preset program is received in the wireless communication terminal user or the communication terminal input from the outside (S202).

Here, the first wireless communication terminal 100-1 switches from the active mode to the power saving mode, and generates a power saving mode notification signal informing the operation mode switching at the time when the power saving mode is switched (S204).

Subsequently, the first wireless communication terminal 100-1 transmits the generated power saving mode notification signal to the access point 110 (S206).

As shown in FIG. 3, the power saving mode notification signal includes a header 300 having information such as state information, information content, and channel occupancy status of the first wireless communication terminal 100-1, and a payload on which information is loaded. (Payload) 310 is included.

In this case, the header 300 includes a power management bit (PwrMgt Bit) 302 indicating state information of the first wireless communication terminal 100-1 according to the power saving mode operation. Here, the power processing bit 302 is set to '1' to inform the sleep state of the power saving mode of the first wireless communication terminal 100-1. On the other hand, when the first wireless communication terminal 100-1 is in the wake-up state of the active mode, the power processing bit 302 is set to '0'.

In addition, the power saving mode operation signal is configured as a frame including information in the payload 310 or a "Null" frame in which no information is loaded in the payload 310.

The access point 110 recognizes that the first wireless communication terminal 100-1 is in the sleep state of the power saving mode by the power saving mode state notification signal received from the first wireless communication terminal 100-1 (S208). That is, the access point 110 recognizes that the first wireless communication terminal 100-1 is in the sleep state by the power processing bit 302 in the received power saving mode state notification signal.

Subsequently, the access point 110 performs packet-transmission-scheduling except for the first wireless communication terminal 100-1 in a sleep state (S210). In other words, the access point 110 does not allocate a communication channel for receiving or transmitting information to the first wireless communication terminal 100-1 in a sleep state, and other second and third wireless communication terminals ( Information delivery scheduling is performed to allocate communication channels to 100-2 and 100-3.

When the active mode switch request signal is input from the internal preset program or the external device (S212), the first wireless communication terminal 100-1 ends the power saving mode operation and switches to the active mode. The first wireless communication terminal 100-1 generates an active mode notification signal informing of the operation mode change at the time when the operation mode is switched to the active mode (S214).

Subsequently, the first wireless communication terminal 100-1 transmits the generated active mode notification signal to the access point 110 (SS216).

Here, the active mode notification signal includes a header 402 and a payload 404 in which the power processing bit 400 is set to '0', as shown in FIG. 4. In this case, the active mode operation signal includes a frame including information in the payload 404 or a "Null" frame in which no information is loaded in the payload 404.

The access point 110 recognizes that the first wireless communication terminal 100-1 is in the wake-up state from the power saving mode to the active mode by the active mode notification signal received from the first wireless communication terminal 100-1. (S218).

That is, the access point 110 recognizes that the first wireless communication terminal 100-1 is in the wake-up state of the active mode by the power processing bit 400 in the received active mode operation signal.

Subsequently, the access point 110 performs information delivery scheduling including the first wireless communication terminal 100-1 in a wake-up state (S220). In other words, the access point 110 performs information delivery scheduling for receiving information from the first to third wireless communication terminals 100-1, 100-2, and 100-3 or allocating a communication channel for transmitting the information.

As described above, the access point 110 accurately recognizes a time point in the sleep state and the wake-up state by the power saving mode operation signal and the active mode operation signal received from the first wireless communication terminal 100-1.

A communication control method of a WLAN network system configured and operated as described above will be described in detail with reference to the accompanying drawings.

5 is a flowchart for performing a power saving mode operation of a wireless communication terminal according to the present invention.

First, the first wireless communication terminal 100-1 receives a power saving mode switch request signal from a preset internal program or an external device (S500). That is, the first wireless communication terminal 100-1 receives a power saving mode operation request signal from an internal program or a user preset to switch to a power saving mode when there is no reception and transmission of information for a predetermined time.

Subsequently, the first wireless communication terminal 100-1 switches the operation mode to the power saving mode according to the input power saving mode switching request signal (S502), and saves power when the power processing bit is '1' at the time of switching to the power saving mode. A mode notification signal is generated (S504).

Here, the power saving mode notification signal is a frame sequence for notifying that the first wireless communication terminal 100-1 is in the sleep state of the power saving mode, as shown in FIG. 3, and the power processing bit 302 is a frame sequence. A bit included in the header 300 is a bit indicating an operation mode state of the first wireless communication terminal 100-1.

Subsequently, the first wireless communication terminal 100-1 transmits the generated power saving mode notification signal to the access point 110 (S506). At this time, the access point 110 recognizes that the first wireless communication terminal 100-1 is in the sleep state of the power saving mode by the received power saving mode notification signal.

6 is a flowchart for performing an active mode operation of a wireless communication terminal according to the present invention.

First, the first wireless communication terminal 100-1 receives an active mode switch request signal from a preset internal program or an external device (S600).

Subsequently, the first wireless communication terminal 100-1 switches the operation mode to the active mode according to the input active mode switch request signal (S602), and the active power processing bit is '0' at the time of switching to the active mode. A mode notification signal is generated (S604).

Here, the active mode notification signal is a frame sequence for notifying that the first wireless communication terminal 100-1 is in the wake-up state of the active mode, as shown in FIG. 4, and the power processing bit 400 is a frame. A bit included in the header 402 of the sequence, which indicates the operation mode state of the first wireless communication terminal 100-1.

Subsequently, the first wireless communication terminal 100-1 transmits the generated active mode notification signal to the access point 110 (S606). At this time, the access point 110 recognizes that the first wireless communication terminal 100-1 is in the wake-up state of the active mode by the received active mode notification signal.

7 is a flowchart for performing communication control of an access point according to the present invention.

First, the access point 110 receives an operation mode notification signal from the first wireless communication terminal 100-1 (S700). Here, the operation mode notification signal is one of a power saving mode notification signal or an active mode notification signal.

Then, the access point 110 checks the power processing bit in the received operation mode notification signal (S702).

The access point 110 determines whether the checked power processing bit is '1' (S704), and when the power processing bit is '1', the first wireless communication terminal 100-1 is in a sleep state. Recognize (S706).

Subsequently, the access point 110 schedules the information transfer except for the first wireless communication terminal 100-1 as the first wireless communication terminal 100-1 is recognized as a sleep state of the power saving mode in step S706. To perform (S708).

That is, the access point 110 does not allocate a communication channel for transmitting and receiving information to the first wireless communication terminal 100-1 in a sleep state, but transmits the information to the first wireless communication terminal 100-1. The information is temporarily stored and then temporarily stored after the first wireless communication terminal 100-1 is switched to the active mode.

On the other hand, if the power processing bit is not '1' in step S704 above, the access point 110 recognizes that the first wireless communication terminal 100-1 is in the wake-up state of the active mode (S710). .

Subsequently, as the first wireless communication terminal 100-1 is recognized as a wake-up state in the active mode, the access point 110 performs information delivery scheduling including the first wireless communication terminal 100-1 (S712). ).

That is, the access point 110 receives information from the first to third wireless communication terminals 100-1, 100-2, and 100-3 or information to the first to third wireless communication terminals 100-1, 100-2, and 100-3. To pass.

Here, although the present invention has been described only for the power saving mode operation and the active mode operation of the first wireless communication terminal, it is obvious that the second and third wireless communication terminals controlled by the access point perform the same operation.

In addition, although the present invention has been described with respect to a WLAN network, the above-described communication control may be performed in other short-range wireless communication, for example, a Bluetooth system.

As described above, in the present invention, the wireless communication terminal in the short range wireless communication system transmits a notification signal informing the operation state to the access point at the time of switching the operation mode.

That is, the wireless communication terminal according to the present invention transmits a power saving mode operation notification signal to notify the access point when the wireless communication terminal is operating in the power saving mode, and accesses the active mode operation notification signal to notify the time when the operation is switched to the active mode. Send to points.

Therefore, the access point according to the present invention can accurately recognize the sleep state and wake-up state transition time of the wireless communication terminal according to the operation mode notification signal received from the wireless communication terminal, thereby performing more efficient information transmission scheduling. It can be effective.

In addition, the present invention can accurately recognize the wake-up state transition time of the wireless communication terminal, can reduce the unnecessary storage time of information for transmission to the wireless communication terminal, it is possible to reduce the hardware burden of the access point There is also.

The specific embodiments or examples made in the detailed description of the present invention are intended to clarify the technical contents of the present invention to the last, and are not to be construed as limited to these specific embodiments by consultation. Various changes can be made within the scope of the claims.

Claims (17)

In the short-range wireless communication control method of a short-range wireless communication system including at least one wireless communication terminal, Receiving an operation mode notification signal indicating that the wireless communication terminal switches from a power saving mode to an active mode; Determining an active mode switch of the wireless communication terminal based on the received operation mode notification signal; And And performing information transmission scheduling including the wireless communication terminal switched to the active mode according to the determination result. The method of claim 1, wherein the performing of the information transfer scheduling including the wireless communication terminal switched to the active mode according to the determination result comprises: And transmitting predetermined information to the wireless communication terminal switched to the active mode or receiving the predetermined information from the wireless communication terminal. The short range wireless communication control method according to claim 1, wherein the operation mode notification signal includes a power processing bit corresponding to an active mode of the wireless communication terminal. The method of claim 1, wherein the wireless communication terminal is a notebook computer, a PDA, a WAP terminal, or a Bluetooth terminal capable of short-range wireless communication. In the short-range wireless communication control method controlled by the base station, Receiving an operation mode switch request signal for requesting an active mode switch; Switching to an active mode according to the operation mode switch request signal; Generating an operation mode notification signal corresponding to the switched active mode at the time of switching to the active mode; And And transmitting the generated operation mode notification signal to the base station. The method of claim 5, wherein the operation mode switch request signal is input from the outside by a user or by a preset program. The method of claim 5, wherein the operation mode notification signal comprises a power processing bit having information corresponding to the switched active mode. The method of claim 5, wherein the base station is an access point connected to the Internet or an Ethernet network. In the short-range wireless communication control method of a short-range wireless communication system comprising at least one wireless communication terminal and a base station for controlling the wireless communication terminal, Generating, by the wireless communication terminal, an operation mode notification signal according to an operation change to an active mode, and transmitting the generated operation mode notification signal to the base station; And determining, by the base station, an active mode switch of the wireless communication terminal according to the operation mode notification signal, and performing information transmission scheduling including the wireless communication terminal switched to the active mode. Wireless communication control method. A short range wireless communication control device for controlling a short range wireless communication system having at least one wireless communication terminal, Means for receiving an operation mode notification signal indicating that the wireless communication terminal switches from a power saving mode to an active mode; Means for determining an active mode switch of the wireless communication terminal based on the received operation mode notification signal; And And means for performing information transfer scheduling including the wireless communication terminal switched to the active mode according to the determination result. The method of claim 10, wherein the means for performing information delivery scheduling including the wireless communication terminal switched to the active mode according to the determination result delivers predetermined information to the wireless communication terminal switched to the active mode; Short-range wireless communication control device characterized in that for receiving a predetermined information from the wireless communication terminal. The apparatus of claim 10, wherein the operation mode notification signal comprises a power processing bit having information corresponding to the operation mode. The apparatus of claim 10, wherein the wireless communication terminal is a notebook computer, a PDA, a WAP terminal, or a Bluetooth terminal capable of short-range wireless communication. A short range wireless communication control device controlled by a base station, Means for receiving an operation mode switch request signal for requesting an active mode switch; Means for switching to an active mode according to the operation mode switch request signal; Means for generating an operation mode notification signal corresponding to the switched active mode at the time of switching to the active mode; And And means for transmitting the generated operation mode notification signal to the base station. The short range wireless communication control device according to claim 14, wherein the operation mode switch request signal is input from the outside by a user or by a preset program. The short range wireless communication control device according to claim 14, wherein the operation mode notification signal comprises a power processing bit having information corresponding to the switched operation mode. The apparatus of claim 14, wherein the base station is an access point connected to an Internet network or an Ethernet network.