KR20090018426A - Apparatus and method for controlling sleep mode in wireless communication system - Google Patents

Abstract

A sleep mode controlling device and a method thereof about terminals comprising P2P network on a wireless communication system are provided to reduce the waste of resource necessary to transmit a traffic indicating message by reducing the number of traffic indicating message transmissions. A terminal 1(303) transmits a sleeping require-message to a base station(301) in order to convert a current mode into a sleep mode(313). The sleeping response message is transmitted to the base station through the cellular network to the terminal 1(315). The sleep mode change over permission or non-permission included in the sleep response message is confirmed in the terminal 1. The terminal 1 operates to the initial sleep section included in the sleep response message(317). The terminal 1 transmits the sleep mode response message with the terminal 2 and terminal 3 through the P2P network(337).

Description

Sleep mode control device and method in wireless communication system {APPARATUS AND METHOD FOR CONTROLLING SLEEP MODE IN WIRELESS COMMUNICATION SYSTEM}

The present invention relates to a wireless communication system using a peer-to-peer (hereinafter referred to as P2P) communication method, and in particular, to control a sleep mode of terminals constituting a P2P network in the wireless communication system. An apparatus and method are provided.

A terminal of a wireless communication system performs communication by using a radio resource managed by a base station. For example, when performing communication between terminals in the wireless communication system, the terminals perform communication through a base station regardless of a distance between them. That is, the terminals performing communication in the wireless communication system are included in the service area of the same base station and the terminals perform communication through the base station even if the distance between the terminals is close. However, in a wireless communication system, it may be more rational to directly communicate with terminals that are close to each other while included in the same cell. Therefore, in recent years, a study on a P2P communication method capable of performing direct communication between terminals using a wireless cellular network in a wireless communication system has been conducted.

The terminals of the wireless communication system operate in a sleep mode when no communication is performed to reduce power consumption. In this case, the terminals operate in the sleep mode by determining the size of the sleep section and the listening window through negotiation with the base station. Here, the listening section is a section in which the terminal operating in the sleep mode checks whether there is downlink traffic directed to the user through a traffic indication message transmitted by the base station. In the sleep period, the terminal receives only a minimum downlink signal from the base station in order to minimize power consumption. In addition, the terminal performs ranging to maintain neighboring base station scanning for handover, uplink communication, and downlink code type according to signal quality during the sleep period.

If the wireless communication system supports the P2P communication method, the terminals constituting the P2P network operate in the sleep mode through negotiation with the base station, as shown in FIG. 1.

1 illustrates a procedure for controlling sleep modes of terminals constituting a P2P network in a wireless communication system according to the prior art.

As shown in FIG. 1, the wireless communication system includes a base station 101, a terminal 1 103, a terminal 2 105, and a terminal 3 107, and the terminals 103, 105, and 107 are P2P. Configure the network.

In this case, the terminals 103, 105, and 107 request the sleep mode to the base station 101 through the wireless cellular network to operate in the sleep mode (steps 111, 121, and 131). That is, the terminals 103, 105, and 107 transmit respective sleep request messages to the base station 101 by using a wireless cellular network.

When the base station 101 receives a sleep request message from the terminals 103, 105, and 107, the base station 101 determines whether to allow a sleep mode for each of the terminals 103, 105, and 107. If the sleep mode is allowed for the terminals 103, 105, and 107, the base station 101 may sleep, listen, and sleep ID for each of the terminals 103, 105, and 107. Determine. Thereafter, the base station 101 transmits a sleep response message including whether the sleep mode is allowed, a sleep section, a listening section, and sleep ID information to each of the terminals 103, 105, and 107 (steps 113 and 123). , Step 133).

Thereafter, the base station 101 receives a traffic indication message indicating whether there is downlink traffic to be transmitted to each of the terminals 103, 105, and 107. Step 139).

When receiving the sleep response message transmitted from the base station 101, the terminals 103, 105, and 107 check whether each of the sleep modes is allowed. If the sleep mode for the terminals 103, 105, and 107 is allowed, the terminals 103, 105, and 107 enter the sleep mode according to the sleep period and the listening period information included in the sleep response message. It works. For example, when the terminal 1 103 operates in the sleep mode, the terminal 1 103 operates in the sleep mode during the sleep period (step 137). Then, when the listening period (step 139), the terminal 1 (103) receives the traffic indication message transmitted by the base station 101 and checks whether there is a downlink traffic directed to it.

As described above, when the wireless communication system supports the P2P communication scheme, terminals constituting the P2P network individually negotiate a sleep mode with the base station. In this case, since the listening interval period of the terminals may vary, the base station transmits a traffic indication message individually to the listening interval of the terminals constituting the P2P network. Therefore, when the number of terminals operating in the sleep mode increases in the wireless communication system, the base station has a problem in that the load on the transmission of the traffic indication message increases.

Accordingly, an object of the present invention is to provide an apparatus and method for controlling sleep mode for terminals constituting a P2P network in a wireless communication system.

Another object of the present invention is to provide an apparatus and method for controlling a sleep mode of other terminals through a representative terminal among terminals constituting a P2P network in a wireless communication system.

It is still another object of the present invention to reduce the number of transmissions of the traffic message by matching the sleep mode setting information of the terminals constituting the P2P network in the wireless communication system with the sleep mode setting information of the representative terminal. To provide an apparatus and method for.

According to a first aspect of the present invention for achieving the objects of the present invention, a method for the terminal of the wireless communication system to operate in the sleep mode, the operation in the sleep mode in a peer-to-peer (P2P) network If a terminal exists, the process of requesting a sleep mode switch to the terminal operating in the sleep mode, and if a response signal for a sleep mode switch request is received from the terminal, whether or not to accept the sleep mode switch from the response signal And confirming, and when the sleep mode switch is accepted, switching to the sleep mode according to the sleep mode management information included in the response signal.

According to a second aspect of the present invention, a method for operating a terminal in a wireless communication system in a sleep mode, when operating in a sleep mode, checking whether a sleep mode switch request is received from the terminals constituting the point-to-point network And when a sleep mode switch request is received from a predetermined terminal, requesting a sleep mode switch for the terminal to the base station; and when a response signal for the sleep mode switch request for the terminal is received from the base station, And transmitting the response signal to the terminal.

According to a third aspect of the present invention, a method for controlling a sleep mode of a terminal performing point-to-peer (P2P) communication in a base station of a wireless communication system includes a representative terminal operating in a sleep mode. When receiving a sleep mode switch request signal for the other terminals constituting the P2P network from the step of determining whether to accept the sleep mode switching of the terminals, and when accepting the sleep mode switching of the terminals, the terminals And determining sleep mode management information to operate the sleep mode in the same manner as the representative terminal, and transmitting the sleep mode switch permission information and the sleep mode management information to the representative terminal.

According to a fourth aspect of the present invention, in a wireless communication system, a terminal device for performing point-to-point communication (hereinafter referred to as P2P) communication may include a terminal operating in a sleep mode in the P2P network. A P2P controller for controlling to request a sleep mode switch to a terminal operating in a sleep mode, a message generator for generating a sleep mode switch request message under the control of the P2P controller, and the terminal through the P2P network Characterized in that it comprises a transmission unit for transmitting to.

According to a fifth aspect of the present invention, a terminal device for performing peer-to-peer (P2P) communication in a wireless communication system, when operating in a sleep mode, through the P2P network through the P2P network A receiver configured to receive a sleep mode switch request signal from terminals constituting the terminal, a controller configured to request a base station to request a sleep mode switch for the terminal from receiving a sleep mode switch request signal, and cellular according to control of the controller And a transmitter for transmitting a sleep mode switch request signal for the terminal to the base station through a network.

According to a sixth aspect of the present invention, a base station apparatus in a wireless communication system includes a receiver for receiving a sleep mode switch request signal from a terminal performing point-to-point communication (hereinafter referred to as P2P) communication and a sleep mode. When receiving a sleep mode switch request signal for other terminals constituting the P2P network from the representative representative terminal operating, when determining whether to accept the sleep mode switching of the terminals, and when accepting the sleep mode switching of the terminals, the terminal And a control unit configured to determine sleep mode management information of the control unit, and a transmitter to transmit a signal including the sleep mode management permission and the sleep mode management information to the representative terminal.

As described above, by setting the sleep mode setting information of the terminals constituting the P2P network to the sleep mode in the wireless communication system to be the same as the sleep mode setting information of the representative terminal operating in the sleep mode, the traffic indication message is transmitted. By reducing the number of times it is advantageous to reduce the waste of resources required for transmitting the traffic indication message.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, the present invention describes a technique for controlling a sleep mode of terminals constituting a peer-to-peer (P2P) network in a wireless communication system.

When the terminal of the wireless communication system provides a non real time-variable rate (NRT-VR) service and an RT-VR (real time-variable rate) service, the operation of the sleep mode is different. For example, when the terminal provides the NRT-VR service, the length of the sleep interval of the terminal increases constantly. That is, if there is no downlink traffic directed to the terminal during the listening period, the terminal operates in the sleep mode during the sleeping period. In this case, the length of the sleeping section increases at a constant rate than the length of the sleeping section before the listening section. If the terminal provides the RE-VR service, the lengths of the sleep section and the listen section are fixed.

In the following description, the terminal assumes the sleep mode when providing the NRT-VR service, but the same may be applied to the case of providing the RT-VR service.

When the P2P communication method is supported in the wireless communication system, adjacent terminals may form a P2P network as shown in FIG. 2 when located in the same cell.

2 shows a configuration of a P2P network in a wireless communication system according to the present invention.

As shown in FIG. 2, the wireless communication system includes a base station 200 and terminals 210, 220, and 230 included in a service area of the base station 200.

The base station 200 communicates with terminals 210, 220, and 230 included in a service area through a cellular network.

The terminals 210, 220, and 230 communicate with the base station 200 through a cellular network and communicate with the terminals 210, 220, and 230 through a P2P network.

If the terminal 1 210 switches to the sleep mode, the terminal 1 210 detects whether there is a terminal operating in the sleep mode among the terminals 220 and 230 constituting the P2P network. In this case, assuming that the terminal 3 230 operates in the sleep mode, the terminal 1 210 requests the sleep mode to the base station 200 through the terminal 3 230.

When the base station 200 receives the sleep mode switch request of the terminal 1 210 received through the terminal 3 230, the base station 200 determines whether to allow the terminal 1 210 to switch to the sleep mode. If the terminal 1 210 does not allow the sleep mode switching, the base station 200 transmits a sleep mode disallowed message to the terminal 1 210 through the terminal 3 230.

On the other hand, when the terminal 1 (210) allows the sleep mode switching, the base station 200 is the same as the sleep mode management information of the sleep mode management information of the terminal 3 (230) through the terminal 3 (230) Transmit to terminal 1 (210). In this case, since the terminal 1 210 receives the same information as the sleep mode management information of the terminal 3 230, the terminal 1 210 operates in the same sleep mode as the terminal 3 230. That is, the terminal 1 210 operates as a listening section in the same section as the terminal 3 230. Accordingly, the base station 200 may broadcast a traffic indication message indicating whether there is downlink traffic between the terminal 1 210 and the terminal 3 230 in the listening period. Here, the sleep mode management information includes sleep mode switching time information, a length of an initial sleep section, a length of a maximum sleep section, a length of a listening section, and the like.

3 is a flowchart illustrating a procedure for controlling sleep modes of terminals constituting a P2P network in a wireless communication system according to an exemplary embodiment of the present invention.

As shown in FIG. 3, the wireless communication system includes a base station 301, a terminal 1 303, a terminal 2 305, and a terminal 3 307, and the terminals 303, 305, and 307 are P2P. Configure the network.

If the terminal 1 303 switches to the sleep mode, the terminal 1 303 sleeps to check whether there is a terminal operating in the sleep mode among the terminals 305 and 307 constituting the P2P network. The mode search message is broadcasted through the P2P network (step 311). That is, the terminal 1 303 transmits the sleep mode search message to all terminals constituting the P2P network. Here, the terminal operating in the sleep mode may receive a sleep mode search message through the P2P network during the sleep period. If the terminal operating in the sleep mode receives the sleep mode search message during the sleep period, it transmits a response message to the sleep mode search message to the corresponding terminal during the listening period. Accordingly, the terminal 1 303 limits the response waiting time for the sleep mode search message to the maximum sleep period.

If the response signal for the sleep mode search message is not received during the response waiting time, the terminal 1 303 determines that there is no terminal operating in the sleep mode in the P2P network. Accordingly, the terminal 1 303 transmits a sleep request message to the base station 301 through the cellular network to switch to the sleep mode (step 313). In this case, the sleep request message includes sleep mode setting information desired by the terminal 1 (303). Here, the sleep mode setting information includes initial sleep section length, maximum sleep section length, and listening section information.

When the base station 301 receives the sleep request message from the terminal 1 303, the base station 301 determines whether to allow the terminal 1 303 to switch to the sleep mode. If the terminal 1 303 allows the sleep mode to be switched, the base station 301 may determine the first sleep interval length of the terminal 1 303 in consideration of the sleep mode setting information desired by the terminal 1 303. Sleep mode management information such as the maximum sleep interval length, the listening interval length, the sleep ID, and the start of sleep mode switching are determined.

Thereafter, the base station 301 transmits a sleep response message including a sleep mode switch permission and sleep mode management information to the terminal 1 303 through a cellular network (step 315).

When the terminal 1 303 receives the sleep response message, the terminal 1 303 checks whether to allow the sleep mode switch included in the sleep response message. If the base station allows the sleep mode switch, the terminal 1 303 switches to the sleep mode according to the sleep mode management information. In this case, the terminal 1 303 operates in the sleep mode during the initial sleep period included in the sleep response message (step 317).

The terminal 1 303 receives a traffic indication message from the base station 301 by operating in a listening mode after the initial sleep period is finished according to the listening period information included in the sleep response message (step 319). That is, the base station 301 transmits a traffic indication message indicating whether there is traffic of the terminal 1 303 to the terminal 1 303 during the listening period (step 321).

In this case, the terminal 1 303 checks whether there is traffic to be transmitted to the terminals belonging to the SLPID group to which it belongs. If the traffic exists, the terminal checks a traffic indication bitmap to determine whether there is traffic to be transmitted to it.

If there is traffic to be transmitted to the terminal 1 303, the terminal 1 303 switches to an active mode to receive the traffic. On the other hand, if there is no traffic to be transmitted to the terminal 1 (303), the terminal 1 (303) operates in the sleep mode during the sleep period increased by a certain ratio than the length of the initial sleep interval (step 323).

When the terminal 2 305 and the terminal 3 307 switch to the sleep mode while the terminal 1 303 is operating in the sleep mode, the terminal 2 305 and the terminal 3 307 through the P2P network. The sleep mode search message is broadcasted (steps 325 and 327). That is, the terminal 2 305 and the terminal 3 307 transmits a sleep mode search message to all the terminals constituting the P2P network.

When the terminal 1 303 receives a sleep mode search message from the terminal 2 305 and the terminal 3 307 through the P2P network during the sleep period (step 323), when the listening period (step 329) arrives, The mobile station requests the base station 301 to switch the sleep mode of the terminal 2 305 and the terminal 3 307 through a cellular network (step 333). That is, the terminal 1 303 transmits a P2P sleep request message for requesting the sleep mode switch for the terminal 2 305 and the terminal 3 307 to the base station 301.

When the base station 301 receives the P2P sleep request message from the terminal 1 303, the base station 301 determines whether to allow the sleep mode switching for the terminal 2 305 and the terminal 3 307. If the terminal 2 305 and the terminal 3 307 allow the sleep mode switch, the base station 301 determines the sleep mode management information of the terminal 2 305 and the terminal 3 (307). In this case, the base station 301 determines the sleep mode management information so that the terminal 2 305 and the terminal 3 307 operate in the same sleep mode as the terminal 1 303. Here, the sleep mode management information includes the length of the first sleep section, the length of the maximum sleep section, the length of the listening section, the start of sleep mode switching, the sleep ID, and the like.

Thereafter, the base station 301 sends a P2P sleep response message including sleep mode management permission and sleep mode management information between the terminal 2 305 and the terminal 3 307 to the terminal 1 303 through a cellular network. Transmit (step 335).

When the terminal 1 303 receives the P2P sleep response message through the cellular network during the listening period (step 329), the terminal 1 303 sends a sleep mode response message to the terminal 2 305 and the terminal 3 307 through the P2P network. Send (step 337). Here, the sleep mode response message includes sleep mode switch permission and sleep mode management information.

In addition, the terminal 1 303 receives the traffic indication message transmitted by the base station 301 during the listening period (step 329) and checks whether there is traffic to be transmitted to it (step 331).

If there is no traffic to be transmitted to the terminal 1 303, the terminal 1 303 operates in the sleep mode during the sleep period increased at a predetermined rate from the previous sleep period (step 323). Here, the length of the sleep section increases up to the maximum sleep section and does not increase thereafter.

In this case, the terminal 2 (305) and the terminal 3 (307) is switched to the sleep mode at the same time as the terminal 1 (303). That is, the terminal 2 305 and the terminal 3 307 operate in the sleep mode during the sleep interval having the same length as the terminal 1 303 (steps 341 and 343).

Also, the terminal 1 303, the terminal 2 305, and the terminal 3 307 operate in the same length listening mode at the same time (steps 345, 347, and 349).

Accordingly, the base station 301 transmits a traffic indication message indicating whether there is traffic between the terminal 1 303, the terminal 2 305, and the terminal 3 307, and the terminal 1 303, the terminal 2 305, and the terminal. Broadcasting is performed at one time during the listening section of step 3307 (step 351).

Hereinafter, a method of operating a terminal of a P2P network for operating in a sleep mode in the wireless communication system will be described.

4 is a flowchart illustrating an operation procedure of a terminal for operating in a sleep mode in a wireless communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 4, first, in step 401, the terminal determines whether to switch to a sleep mode to reduce power loss.

When the terminal switches to the sleep mode, the terminal proceeds to step 403 to broadcast a sleep mode search message to the P2P network to check whether there is a terminal operating in the sleep mode among the terminals constituting the P2P network. That is, the terminal transmits a sleep mode search message to all terminals constituting the P2P network.

In step 405, the terminal determines whether a response signal for the sleep mode search message is received during the response waiting time. Here, the response waiting time is equal to the length of the maximum sleep interval when the terminal is operating in the sleep mode.

If the response message is not received during the response waiting time, the terminal determines that there is no terminal operating in the sleep mode among the terminals constituting the P2P network. Accordingly, the terminal proceeds to step 417 to request the sleep mode switch to the base station through the cellular network. In this case, the terminal transmits to the base station a sleep request message including sleep mode setting information such as the first sleep section, the maximum sleep section, and the listening section information desired by the terminal.

In step 419, the terminal determines whether a sleep response message is received from the base station through a cellular network.

If the sleep response message is received, the terminal checks whether the base station permits switching to the sleep mode of the terminal in the sleep response message. If the base station allows the terminal to switch to the sleep mode, the terminal proceeds to step 407 to switch to the sleep mode according to the sleep mode management information included in the sleep response message. Here, the sleep mode management information includes a sleep mode switching time point, a length of an initial sleep section, a length of a maximum sleep section, listening section information, and the like.

Meanwhile, when a response message is received during the response waiting time, the terminal checks whether the base station allows the terminal to switch to the sleep mode in the response message. If the base station allows the terminal to switch to the sleep mode, the terminal proceeds to step 407 to switch to the sleep mode according to the sleep mode management information included in the response message. In this case, the sleep mode management information is the same as the sleep mode management information of the terminal (hereinafter, referred to as a representative terminal) that transmitted the response signal. Therefore, the terminal operates in the same sleep mode as the representative terminal. That is, the terminal switches to the sleep period of the sleep mode at the same time as the representative terminal, switches to the listening mode at the same time as the representative terminal, and operates in the listening mode for the same length.

In step 409, the terminal determines whether a sleep mode search message is received through the P2P network. That is, the terminal checks whether there is a terminal broadcasting a sleep mode search message for searching for a terminal operating in the sleep mode to switch to the sleep mode through the P2P network. In this case, the terminal may identify the terminal transmitting the sleep mode search message by using the unique ID of the terminal included in the sleep mode search message.

When the sleep mode search message is received, the terminal proceeds to step 411 and requests the base station to switch the sleep mode for the terminals that have transmitted the sleep mode search message through the cellular network during the listening period.

In step 413, the terminal determines whether a P2P sleep response message is received from the base station through a cellular network.

When the P2P sleep response message is received, the terminal proceeds to step 415 and transmits information related to sleep mode switching included in the P2P sleep response message to the terminals that have transmitted the sleep mode search message. Here, the information related to the sleep mode switching includes sleep mode switching permission and sleep mode management information. In this case, the sleep mode management information has the same information as the sleep mode management information of the terminal. At this time, the sleep IDs are not the same in the sleep mode management information.

Thereafter, the terminal terminates the present algorithm.

In the above-described embodiment, when there is traffic to be transmitted to the representative terminal, the representative terminal determines the other terminal operating in the sleep mode while configuring the P2P network as the representative terminal. Thereafter, the changed representative terminal information is transmitted to the base station.

Hereinafter, a method of operating a base station for managing sleep modes of terminals constituting a P2P network will be described.

5 illustrates an operation procedure of a base station for controlling a sleep mode of terminals of a P2P network in a wireless communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 5, first, the base station determines whether a sleep request message is received from a terminal through a cellular network in step 501.

If the sleep request message is received, the base station proceeds to step 503 and determines whether to allow the sleep mode switching and sleep mode management information for the terminal. For example, the base station determines whether to allow switching of the sleep mode of the terminal that transmitted the sleep request message. If the terminal allows the terminal to switch to sleep mode, the base station considers the length of the initial sleep interval, the maximum sleep interval, and the listening interval length information desired by the terminal included in the sleep request message to the terminal. Determine sleep mode management information. Here, the sleep mode management information includes a sleep mode switch start time of the terminal, a length of an initial sleep section, a length of a maximum sleep section, a length of a listening section, and sleep ID information.

After determining the sleep mode management information, the base station proceeds to step 505 and transmits a sleep response message including the sleep mode switch permission and sleep mode management information to the terminal.

If the mobile station is allowed to switch to sleep mode, the base station proceeds to step 507 and broadcasts a traffic indication message indicating whether there is traffic to be transmitted to the mobile station according to the listening interval information of the mobile station.

In step 509, the base station determines whether a P2P sleep request message is received from the representative terminal operating in the sleep mode. Here, the representative terminal refers to a terminal for relaying the sleep mode switching of other terminals among the terminals operating in the sleep mode among the terminals constituting the P2P network. In addition, the P2P sleep request message includes terminal information for requesting to switch the sleep mode to the representative of the terminals constituting the P2P network.

When the P2P sleep request message is received, the base station proceeds to step 511 and determines whether to allow the sleep mode switch and sleep mode management information for the terminal requesting the sleep mode switch to the representative terminal. For example, the base station determines whether to allow the sleep mode switch of the terminal requesting the sleep mode switch. If the terminal permits the sleep mode switching, the base station determines sleep mode management information for the terminal. At this time, the base station determines the sleep mode switching start time, the first sleep period, the maximum sleep period, listening section information so that the terminal operates in the same sleep mode as the representative terminal.

Thereafter, the base station proceeds to step 513 and transmits a sleep response message including sleep mode management permission and sleep mode management information of the terminal requesting the sleep mode switch to the representative terminal to the terminal.

If the mobile station is allowed to switch to the sleep mode, the base station proceeds to step 515 and whether there is traffic to be transmitted to the terminal and the terminal requesting the sleep mode switch to the representative terminal according to the listening interval information of the representative terminal. Broadcast a traffic indication message indicating. That is, since the terminal requesting the sleep mode switch to the representative terminal and the representative terminal operates in the same sleep mode, the base station can transmit a traffic indication message from the terminals at once.

The base station then terminates this algorithm.

In the above-described embodiment, when the terminal searches for a terminal operating in the sleep mode in a P2P network, whether the terminal operates in the sleep mode according to whether a response signal for the sleep mode search message is received during the response waiting time. Determine whether or not. If there is a representative terminal operating in the sleep mode, the representative terminal requests the base station to switch the sleep mode of the terminal. Thereafter, when the representative terminal receives a signal for a sleep mode switch request from the base station, the representative terminal transmits a response message to the sleep mode search message to the terminal.

In another embodiment, when the sleep mode search message is received, the representative terminal may transmit a response message to the sleep mode search message to recognize the terminal in which the terminal operates in the sleep mode.

Hereinafter, the device configuration of the terminal and the base station for controlling the sleep mode of the terminals constituting the P2P network as described above.

6 shows a block configuration of a terminal constituting a P2P network in a wireless communication system according to the present invention. In the following description, it is assumed that the terminal uses a time division duplex scheme, but terminals using other communication schemes may be configured in the same manner.

As illustrated in FIG. 6, the terminal includes a duplexer 601, a reception modem 603, a message processing unit 605, a control unit 607, a P2P control unit 609, a message generation unit 611, and a transmission modem 613. It is configured to include).

First, the duplexer 601 transmits a reception signal (downlink signal) from an antenna to the reception modem 603 according to a time division duplex scheme, and transmits a transmission signal (uplink signal) from the transmission modem 613. Transfer to the antenna.

The reception modem 603 includes an RF reception block, a demodulation block, a channel decoding block, etc., and restores data from a signal provided from the duplexer 601 and transmits the data to the message processing unit 605. Here, the RF reception block includes a filter and an RF preprocessor, and the demodulation block includes an FFT operator for extracting data contained in each subcarrier, and the channel decoding block includes a demodulator and a deinterleaver. ) And a channel decoder.

The message processing unit 605 decomposes the signal provided from the reception modem 603 and provides the result to the controller 607 or the P2P controller 609. For example, the message processor 605 provides the controller 607 with a signal received from a base station through a cellular network. In addition, the message processing unit 605 provides a signal received from another terminal through the P2P network to the P2P control unit 609.

The controller 607 controls the terminal to allow the terminal to communicate with the base station through a cellular network. For example, when the terminal switches to the sleep mode, the P2P controller 609 checks whether there is a terminal operating in the sleep mode among the terminals constituting the P2P network. If there is no terminal operating in the sleep mode, the controller 607 controls the message generator 611 to request the sleep mode switch to the base station through a cellular network. Thereafter, when the sleep response message transmitted by the base station is received from the message processor 605, the controller 607 checks whether to allow the sleep mode to be included in the sleep response message. If the base station allows the terminal to switch to the sleep mode, the controller 607 controls the terminal to operate in the sleep mode according to the sleep mode management information included in the sleep response message. The sleep mode management information includes a sleep mode switch start time point, a length of an initial sleep section, a length of a maximum sleep section, a length of a listening section, sleep ID information, and the like.

If there is a terminal operating in the standby mode among the terminals constituting the P2P network, the controller 607 controls to switch to the sleep mode through the sleep mode response message provided from the P2P controller 609. .

In addition, when the terminal is a representative terminal, the controller 607 may request the base station to request the base station to switch the sleep mode for the terminals broadcasting the sleep mode search message provided from the P2P controller 609. 611). Thereafter, when the P2P sleep response message transmitted from the base station is received from the message processing unit 605, the controller 607 provides the P2P sleep response message to the P2P controller 609.

When the terminal switches to the sleep mode, the P2P controller 609 checks whether a terminal operating in the sleep mode exists in the P2P network under the control of the controller 607. That is, the P2P control unit 609 controls the message generating unit 611 to transmit a sleep mode search message to all terminals constituting the P2P network. Thereafter, the P2P controller 609 checks whether a sleep mode response message is received from the terminals constituting the P2P network from the message processor 605 during the response waiting time. Here, the P2P controller 609 determines that there is no terminal operating in the sleep mode if the sleep mode response message is not received during the response waiting time.

If there is no terminal operating in the sleep mode, the P2P controller 609 controls the controller 607 to request the sleep mode switch to the base station through the cellular network.

On the other hand, when there is a terminal operating in the sleep mode, the P2P controller 609 sends a sleep mode response message received from a representative terminal among the terminals operating in the sleep mode to the message processor 605 in the control unit 607. To provide.

In addition, when the P2P control unit 609 receives a sleep mode search message transmitted by terminals constituting the P2P network from the message processing unit 605, the P2P controller 609 requests the base station to switch the sleep mode for the terminals. 607).

The message generator 611 generates a message for transmission to a base station or other terminals configuring a P2P network under the control of the controller 607 or the P2P controller 609. For example, the message generator 611 generates a message for requesting switching of the sleep mode of the terminal or a message for requesting sleep mode switching of other terminals constituting a P2P network under the control of the controller 607. .

In addition, the message generator 611 sleeps as a representative terminal operating in a message or standby mode to check whether there is a terminal operating in a standby mode among terminals constituting the P2P network under the control of the P2P controller 609. Create a message to request mode switching.

The transmission modem 613 includes a channel code block, a modulation block, an RF transmission block, and the like. The transmission modem 613 converts a signal provided from the message generator 611 into a form for wireless section transmission to a duplexer 601. To pass.

In the above-described configuration, the controller 607 is a protocol controller, which controls the message processor 605, the P2P controller 609, and the message generator 611. That is, the controller 607 may perform the functions of the message processor 605, the P2P controller 609, and the message generator 611. In the present invention, it is separately configured to describe each function separately. Therefore, in actual implementation, all of them may be configured to be processed by the controller 607, and only some of them may be configured to be processed by the controller 607.

7 is a block diagram of a base station for controlling a sleep mode of a terminal constituting a P2P network in a wireless communication system according to the present invention. In the following description, it is assumed that the base station uses a time division duplex scheme, but the base stations using other communication schemes may be configured in the same manner.

As illustrated in FIG. 7, the base station includes a duplexer 701, a reception modem 703, a message processor 705, a controller 707, a sleep mode determiner 709, a sleep mode controller 711, and a message generator. It comprises a unit 713 and a transmission modem 715.

First, the duplexer 701 transmits a reception signal (downlink signal) from an antenna to the reception modem 703 according to a time division duplex scheme, and transmits a transmission signal (uplink signal) from the transmission modem 715. Transfer to the antenna.

The reception modem 703 includes an RF reception block, a demodulation block, a channel decoding block, etc., and restores data from a signal provided from the duplexer 701 and transmits the data to the message processing unit 705. Here, the RF reception block includes a filter and an RF preprocessor, and the demodulation block includes an FFT operator for extracting data contained in each subcarrier, and the channel decoding block includes a demodulator and a deinterleaver. ) And a channel decoder.

The message processing unit 705 decomposes the signal provided from the reception modem 703 and provides the result to the control unit 707. For example, the message processor 705 provides a signal received from the terminal to the controller 707 via a cellular network.

The controller 707 controls the sleep mode of the terminal according to the signal received through the cellular network. For example, when the sleep request message is received from the message processing unit 705, the controller 707 controls the sleep mode determination unit 709 to allow the sleep mode switch of the terminal that has transmitted the sleep request message. Determine. In addition, when the P2P sleep request message is received from the message processor 705, the controller 707 controls the sleep mode determiner 709 to request the sleep mode switch to the representative terminal that transmitted the P2P sleep request message. It is determined whether to allow switching of the sleep mode of the terminal constituting the P2P network.

If the terminal does not allow the sleep mode switch, the controller 707 controls the message generator 713 to transmit a sleep mode switch disallowed message to the terminal.

On the other hand, when allowing the terminal to change the sleep mode, the control unit 707 controls the sleep mode control unit 711 to determine the sleep mode management information for the terminal. Here, the sleep mode management information includes a sleep mode switch start time point, a length of an initial sleep section, a length of a maximum sleep section, a length of a listening section, a sleep ID, and the like.

If the sleep mode management information of the terminal that has transmitted the sleep request message is determined, the sleep mode controller 711 considers sleep mode setting information desired by the terminal included in the sleep request message to manage the sleep mode. Determine the information. Here, the sleep mode setting information includes information about the length of the first sleep section, the length of the maximum sleep section, and the length of the listening section.

On the other hand, when determining the sleep mode management information of the terminal constituting the P2P network requesting the sleep mode switch to the representative terminal transmitting the P2P sleep request message, the sleep mode control unit 711 is the same as the representative terminal The sleep mode management information is determined to operate in the sleep mode.

The message generator 713 generates a message for transmission to the terminals under the control of the controller 707. For example, the message generator 713 generates a sleep response message or a P2P sleep response message including sleep mode management information and sleep mode management information under the control of the controller 707.

The transmission modem 715 includes a channel code block, a modulation block, an RF transmission block, and the like. The transmission modem 715 converts a signal provided from the message generator 713 into a form for wireless section transmission to a duplexer 701. To pass.

In the above-described configuration, the controller 707 controls the message processor 705, the sleep mode determiner 709, the sleep mode controller 711, and the message generator 713 as a protocol controller. That is, the controller 707 may perform the functions of the message processor 705, the sleep mode determiner 709, the sleep mode controller 711, and the message generator 713. In the present invention, it is separately configured to describe each function separately. Therefore, in actual implementation, all of them may be configured to be processed by the controller 707, and only some of them may be configured to be processed by the controller 707.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

1 is a diagram illustrating a procedure for controlling a sleep mode of terminals constituting a P2P network in a wireless communication system according to the prior art;

2 is a diagram illustrating a configuration of a P2P network in a wireless communication system according to the present invention;

3 is a diagram illustrating a procedure for controlling sleep modes of terminals configuring a P2P network in a wireless communication system according to an embodiment of the present invention;

4 is a diagram illustrating an operation procedure of a terminal for operating in a sleep mode in a wireless communication system according to an embodiment of the present invention;

5 is a diagram illustrating an operation procedure of a base station for controlling sleep modes of terminals of a P2P network in a wireless communication system according to an embodiment of the present invention;

6 is a block diagram of a terminal constituting a P2P network in a wireless communication system according to the present invention; and

7 is a block diagram of a base station for controlling a sleep mode of a terminal constituting a P2P network in a wireless communication system according to the present invention.

Claims (32)

In the method for the terminal of the wireless communication system to operate in the sleep mode, When there is a terminal operating in a sleep mode in a peer-to-peer (P2P) network, requesting a sleep mode switch to a terminal operating in the sleep mode; When the response signal for the sleep mode switch request is received from the terminal, confirming whether to accept the sleep mode switch from the response signal; And in response to the change of the sleep mode, switching to the sleep mode according to the sleep mode management information included in the response signal. The method of claim 1, The process of identifying the terminal operating in the sleep mode, Transmitting a sleep mode search signal to terminals constituting the P2P network; Checking whether a response signal to the sleep mode search signal is received during a response waiting time; And when the response signal is received during the response waiting time, determining that a terminal operating in the sleep mode exists. The method of claim 1, The process of requesting the sleep mode switch, When there are at least two terminals operating in the sleep mode, identifying a representative terminal among the terminals; And requesting to switch the sleep mode to the representative terminal. The method of claim 1, The sleep mode management information may include at least one of a sleep ID (Identification), a sleep mode switch time point, a length of an initial sleep section, a length of a maximum sleep section, and listening section information. The method of claim 1, The sleep mode management information may include at least one of a sleep mode switching time point, a length of an initial sleep section, a length of a maximum sleep section, and a listening section information to perform a sleep mode in the same manner as a terminal operating in the sleep mode. How to feature. The method of claim 1, The process of switching to the sleep mode, And switching to a sleep mode in the same manner as a terminal operating in the sleep mode according to sleep mode management information included in the response signal. The method of claim 1, Requesting to switch the sleep mode to the base station when there is no terminal operating in the sleep mode in the P2P network; And if the base station allows the sleep mode to be switched, switching to the sleep mode according to the sleep mode management information provided from the base station. In the method for the terminal of the wireless communication system to operate in the sleep mode, Transmitting a search signal to terminals constituting a peer-to-peer (P2P) network to search for a terminal operating in a sleep mode; Checking whether a response signal for the search signal is received from the terminals during the response waiting time; If a response signal to the search signal is received during the response waiting time, determining whether to accept the sleep mode switch from the response signal; And in response to the change of the sleep mode, switching to the sleep mode according to the sleep mode management information included in the response signal. The method of claim 8, The sleep mode management information may include at least one of a sleep ID (Identification), a sleep mode switch time point, a length of an initial sleep section, a length of a maximum sleep section, and listening section information. The method of claim 8, The sleep mode management information may include at least one of a sleep mode switching time point, a length of an initial sleep section, a length of a maximum sleep section, and a listening section information to perform a sleep mode in the same manner as the terminal that transmitted the response signal. How to feature. The method of claim 8, The process of switching to the sleep mode, And switching to a sleep mode in the same manner as a terminal transmitting the response signal according to sleep mode management information included in the response signal. The method of claim 8, Requesting a base station to switch to sleep mode when the response signal is not received during the response time; And if the base station allows the sleep mode to be switched, switching to the sleep mode according to the sleep mode management information provided from the base station. In the method for the terminal of the wireless communication system to operate in the sleep mode, When operating in the sleep mode, checking whether a sleep mode switch request is received from terminals constituting the point-to-point network; When the sleep mode switch request is received from a predetermined terminal, requesting the sleep mode switch for the terminal to the base station; And when the response signal for the sleep mode switch request for the terminal is received from the base station, transmitting the response signal to the terminal. The method of claim 13, The process of confirming the sleep mode switch request, Checking whether a search signal transmitted by the terminals configuring the point-to-point network to search for a terminal operating in a sleep mode is received; And when the search signal is received, determining that the terminal having transmitted the search signal has requested to switch to a sleep mode. The method of claim 13, The process of confirming the sleep mode switch request, Confirming whether the terminals constituting the point-to-point network receive a search signal transmitted for searching for a terminal operating in a sleep mode; When the search signal is received, transmitting a response signal to the search signal to a terminal that has transmitted the search signal; And checking whether a sleep mode switch request signal is received from the terminal. A method for controlling a sleep mode of a terminal performing point-to-point (Peer to Peer) communication in a base station of a wireless communication system, When receiving a sleep mode switch request signal for other terminals constituting the P2P network from the representative terminal operating in the sleep mode, determining whether to accept the sleep mode switching of the terminals; Determining sleep mode management information so that the terminals operate in the same sleep mode as the representative terminal when accepting the sleep mode switching of the terminals; And transmitting the sleep mode management permission and the sleep mode management information to the representative terminal. The method of claim 16, The sleep mode management information may include at least one of a sleep ID of each of the terminals, a sleep mode switching time point to perform a sleep mode in the same manner as the representative terminal, a length of an initial sleep section, a length of a maximum sleep section, and listening section information. Method comprising the comprising. In a terminal device for performing point-to-point communication (hereinafter referred to as P2P) in a wireless communication system, A P2P controller for controlling to request a sleep mode switch to a terminal operating in the sleep mode when a terminal operating in the sleep mode exists in the P2P network; A message generator for generating a sleep mode switch request message under the control of the P2P controller; And a transmitter for transmitting the message to the terminal through the P2P network. The method of claim 18, The P2P control unit controls to check whether there is a terminal operating in a sleep mode by broadcasting a search signal to the P2P network, And when there is a terminal operating in the sleep mode, controlling to request the terminal to switch to sleep mode. The method of claim 19, If there is at least two terminals operating in the sleep mode, the P2P controller checks a representative terminal among the terminals and controls the P2P controller to request to switch the sleep mode to the representative terminal. The method of claim 18, Further comprising a receiving unit for receiving a response signal according to the sleep mode switch request from the terminal through the P2P network, The P2P controller checks whether or not the sleep mode switch request is accepted in the response signal and controls to switch to the sleep mode according to the sleep mode management information included in the response signal. . The method of claim 21, The P2P control unit controls to operate in the same sleep mode as the terminal that transmitted the response signal according to the sleep mode management information included in the response signal when the sleep mode switch is accepted. The method of claim 21, The receiving unit, characterized in that for receiving a signal through the P2P network or cellular network. The method of claim 21, The sleep mode management information may include at least one of a sleep ID (Identification), a sleep mode switch time point, a length of an initial sleep section, a length of a maximum sleep section, and listening section information. The method of claim 18, If there is no terminal operating in the sleep mode in the P2P network, further comprising a control unit for controlling the base station to request to switch to sleep mode, The P2P controller, if there is no terminal operating in the sleep mode in the P2P network, the device characterized in that for controlling the control unit to request to switch to the sleep mode. In a terminal device that performs point-to-point communication in a wireless communication system (hereinafter referred to as P2P), When operating in the sleep mode, the receiver for receiving a sleep mode switch request signal from the terminals constituting the P2P network via the P2P network, A control unit which controls to request a base station to switch a sleep mode for the terminal when the sleep mode switch request signal is received; And a transmitter for transmitting a sleep mode switch request signal for the terminal to the base station through a cellular network under the control of the controller. The method of claim 26, The receiving unit receives a sleep mode switch request signal from the terminals constituting the P2P network through the P2P network, And receiving a response signal for the sleep mode switch request signal from the base station through the cellular network. The method of claim 26, The transmitter transmits a sleep mode switch request signal for the terminal to the base station through the cellular network, The device characterized in that for transmitting the response signal received from the base station via the P2P network to the terminal requesting the sleep mode switch. A base station apparatus in a wireless communication system, A receiver for receiving a sleep mode switch request signal from a terminal performing point-to-point (Peer to Peer) communication; When a sleep mode switch request signal for other terminals constituting the P2P network is received from the representative terminal operating in the sleep mode, it is determined whether to accept the sleep mode switching of the terminals, and when the sleep mode switching of the terminals is accepted. A control unit for determining sleep mode management information of the terminals; And a transmitter for transmitting a signal including the sleep mode switch permission and the sleep mode management information to the representative terminal. The method of claim 29, The control unit, A sleep mode determination unit determining whether to accept the sleep mode switching of the terminals; And a sleep mode controller configured to determine sleep mode management information of the terminals when accepting the sleep mode switching of the terminals. The method of claim 30, And the sleep mode controller determines sleep mode management information for enabling the terminals to operate in the same sleep mode as the representative terminal. The method of claim 30, The sleep mode controller may include at least one of a sleep ID of each of the terminals, a sleep mode switching time point for performing a sleep mode in the same manner as the representative terminal, a length of an initial sleep section, a length of a maximum sleep section, and listening section information. And determine sleep mode management information comprising.

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