KR101430598B1 - Apparatus and method for controlling sleep mode in wireless communication system - Google Patents

Abstract

The present invention relates to an apparatus and method for controlling a sleep mode of terminals constituting a peer-to-peer (hereinafter referred to as P2P) network in a wireless communication system, in which a terminal operating in a sleep mode exists in the P2P network The method comprising the steps of: requesting a terminal operating in the sleep mode to switch to a sleep mode; checking whether the sleep mode switch is accepted in the response signal when a response signal to the sleep mode switch request is received from the terminal; And switching to a sleep mode according to the sleep mode management information included in the response signal when the sleep mode switching is accepted, thereby reducing a number of traffic indication message transmissions and wasting resources required to transmit the traffic indication message. There is an advantage to reduce.

A P2P network, a sleep mode, a listening mode,

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a sleep mode control apparatus and a sleep mode control method in a wireless communication system,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a wireless communication system using a peer-to-peer (P2P) communication scheme, and more particularly to a wireless communication system in which a sleep mode And more particularly,

A terminal of a wireless communication system performs communication using radio resources managed by a base station. For example, when performing communication between terminals in the wireless communication system, the terminals perform communication through the base station irrespective of the distance between them. That is, even if the terminals performing communication in the wireless communication system are included in the service area of the same base station and the distance between the terminals is close, the terminals perform communication through the base station. However, in a wireless communication system, it may be more reasonable to directly communicate with terminals having close distances while being included in the same cell. Accordingly, in recent wireless communication systems, research on a P2P communication method capable of performing direct communication between terminals using a wireless cellular network is underway.

The terminals of the wireless communication system operate in a sleep mode when communication is not performed to reduce power consumption. At this time, the terminals negotiate with the base station and operate in a sleep mode by determining the size of the sleep interval and the listening interval. Herein, the listening interval is a period during which the terminal operating in the sleep mode checks whether there is downlink traffic directed to the terminal through the traffic indication message transmitted by the base station. The sleep interval receives only a minimum downlink signal from the base station to minimize power consumption. Also, the terminal performs ranging to maintain a downlink code type according to signal quality and to maintain uplink communication and scanning for a neighbor base station for handover during the sleep interval.

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

FIG. 1 shows a procedure for controlling a sleep mode of terminals constituting a P2P network in a wireless communication system according to the related art.

1, the wireless communication system includes a base station 101, a first terminal 103, a second terminal 105, and a third terminal 107, and the terminals 103, 105, Network.

At this time, the terminals 103, 105, and 107 individually request sleep mode to the base station 101 through the wireless cellular network in order to operate in the sleep mode (steps 111, 121, and 131). That is, the terminals 103, 105, and 107 transmit sleep request messages to the base station 101 using the wireless cellular network.

When the sleep request message is received from the terminals 103, 105, and 107, the base station 101 determines whether to allow the 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 transmits a sleep interval, a listening interval and a sleep ID to each of the terminals 103, 105 and 107, . The base station 101 transmits a sleep response message including the sleep mode allowance, the sleep interval, the listening interval and the sleep ID information to each of the terminals 103, 105 and 107 (steps 113 and 123) , Step 133).

The base station 101 transmits a traffic indication message indicating the presence or absence of downlink traffic to be transmitted to each of the terminals 103, 105 and 107 to the listening interval of the terminals 103, 105 and 107 Step 139).

When the sleep response message transmitted by the base station 101 is received, the terminals 103, 105, and 107 check whether each sleep mode is allowed. If the sleep mode for the terminals 103, 105, and 107 is permitted, the terminals 103, 105, and 107 may transmit the sleep mode to the sleep mode according to the sleep interval and the sleep interval information included in the sleep response message. . For example, when the terminal (1) 103 operates in the sleep mode, it operates in the sleep mode during the sleep interval (step 137). Thereafter, in the listening interval (step 139), the first MS 103 receives the traffic indication message transmitted by the BS 101 and determines whether downlink traffic directed to the MS exists.

As described above, when the P2P communication method is supported in the wireless communication system, the terminals constituting the P2P network individually negotiate the sleep mode with the base station. In this case, since the listening interval of the terminals may vary, the BS transmits a traffic indication message separately 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 experiences a problem of increasing the load on the transmission of the traffic indication message.

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

It is another object of the present invention 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 another object of the present invention to provide a method and apparatus for synchronizing a sleep mode setting information of terminals operating in a sleep mode among terminals configuring a P2P network with a sleep mode setting information of a representative terminal in a wireless communication system, And to provide a method and an apparatus for the same.

According to a first aspect of the present invention, there is provided a method for operating a terminal of a wireless communication system in a sleep mode, the method comprising: operating in a sleep mode in a peer-to-peer (P2P) The method comprising the steps of: requesting a terminal operating in the sleep mode to request a sleep mode change if the terminal is present; receiving a sleep mode change request from the terminal; And switching to the sleep mode according to the sleep mode management information included in the response signal when the sleep mode switch is accepted.

According to a second aspect of the present invention, there is provided a method for operating a terminal of a wireless communication system in a sleep mode, the method comprising the steps of: determining whether a sleep mode change request is received from terminals constituting a point- Requesting a base station to switch a sleep mode to the base station when a sleep mode change request is received from a predetermined terminal; and when a response signal for a sleep mode change request to 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, there is provided a method for controlling a sleep mode of a terminal performing peer-to-peer (P2P) communication in a base station of a wireless communication system, Determining whether to accept the sleep mode switching of the terminals when the sleep mode switching request signal for the other terminals constituting the P2P network is received from the terminal; Determining the sleep mode management information to operate the sleep mode in the same manner as the representative terminal, and transmitting the sleep mode control permission information and the sleep mode management information to the representative terminal.

According to a fourth aspect of the present invention, there is provided a terminal apparatus for performing peer-to-peer (hereinafter referred to as P2P) communication in a wireless communication system, when a terminal operating in a sleep mode exists in the P2P network, A message generating unit for generating a sleep mode change request message under the control of the P2P control unit, and a message generating unit for generating the sleep mode change request message through the P2P network through the P2P network, And a transmitting unit for transmitting the data to the mobile station.

According to a fifth aspect of the present invention, a terminal apparatus performing a Peer to Peer (P2P) communication in a wireless communication system, when operating in a sleep mode, A controller for controlling the base station to switch the sleep mode of the terminal when the sleep mode switch request signal is received; and a control unit for controlling the cellular system to switch from the sleep mode to the sleep mode, And a transmitter for transmitting a sleep mode change request signal to the base station through the network.

According to a sixth aspect of the present invention, in a wireless communication system, a base station apparatus includes a receiving unit that receives a sleep mode switching request signal from a terminal performing peer to peer (P2P) communication, When receiving a sleep mode change request signal for other terminals constituting the P2P network from the active representative terminal, determines whether to accept the sleep mode change of the terminals, and when the sleep mode change of the terminals is accepted, And a transmitting unit for transmitting a signal including the sleep mode switching permission and the sleep mode management information to the representative terminal.

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

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Hereinafter, a description will be made of a technique for controlling a sleep mode of terminals that form a peer-to-peer (P2P) network in a wireless communication system.

The terminal of the wireless communication system changes its operation in the sleep mode when providing a non-real time variable rate (NRT-VR) service and in providing an RT-VR (Real Time-Variable Rate) service. For example, when the terminal provides the NRT-VR service, the length of the sleep interval of the terminal constantly increases. That is, if the UE does not have downlink traffic directed to itself during the listening interval, it operates in the sleep mode during the sleep interval. At this time, the length of the sleep interval increases at a constant rate from the length of the sleep interval before the listening interval. If the terminal provides the RE-VR service, the sleep interval and the length of the listening interval are fixed.

Although the following description assumes a sleep mode when the terminal provides the NRT-VR service, the present invention can also be applied to the case of providing the RT-VR service.

In the case of supporting the P2P communication scheme in the wireless communication system, neighboring terminals located in the same cell can constitute a P2P network as shown in FIG.

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

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 the terminals 210, 220 and 230 included in the service area through the cellular network.

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

If the first terminal 210 switches to the sleep mode, the first terminal 210 searches for a terminal operating in the sleep mode among the terminals 220 and 230 constituting the P2P network. At this time, if the terminal 3 230 operates in the sleep mode, the terminal 1 210 requests the base station 200 through the terminal 3 230 for a sleep mode.

The base station 200 determines whether the sleep mode switching of the first terminal 210 is allowed when the sleep mode switching request of the first terminal 210 provided through the third terminal 230 is received. If the sleep mode switching of the first terminal 210 is not permitted, the base station 200 transmits a sleep mode disable message to the first terminal 210 via the third terminal 230.

Meanwhile, when the sleep mode switching of the first terminal 210 is permitted, the base station 200 transmits sleep mode management information, which is the same as the sleep mode management information of the terminal 3 230, To the first terminal (210). At this time, since the first terminal 210 receives the same information as the sleep mode management information of the third terminal 230, the first terminal 210 operates in the same sleep mode as the third terminal 230. That is, the first terminal 210 operates in the same interval as the third terminal 230 in the listening interval. Therefore, the BS 200 broadcasts a traffic indication message indicating whether there is downlink traffic between the first UE 210 and the third UE 230 in the listening interval. Here, the sleep mode management information includes sleep mode switching time information, a length of a first sleeping interval, a length of a maximum sleeping interval, and a length of a listening interval.

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

3, the wireless communication system includes a base station 301, a first terminal 303, a second terminal 305 and a third terminal 307. The terminals 303, 305, Network.

If the subscriber station 303 switches to the sleep mode, the subscriber station 303 determines whether there is a subscriber station operating in the sleep mode among the subscriber stations 305 and 307 constituting the P2P network, Mode search message to the P2P network (step 311). That is, the MS 1 303 transmits the sleep mode search message to all MSs constituting the P2P network. Here, the terminal operating in the sleep mode may receive the sleep mode search message through the P2P network during the sleep interval. If the terminal operating in the sleep mode receives the sleep mode search message during the sleep interval, it transmits a response message to the sleep mode search message to the corresponding terminal during the listening interval. Accordingly, the terminal 1 (303) limits the response waiting time for the sleep mode search message to the maximum sleep interval.

If a response signal to the sleep mode search message is not received during the response waiting time, the first MS 303 determines that there is no MS in the sleep mode in the P2P network. Accordingly, the MS 1 303 transmits a sleep request message to the BS 301 through the cellular network to switch to the sleep mode (step 313). At this time, the sleep request message includes sleep mode setting information desired by the terminal 1 (303). Here, the sleep mode setting information includes a first sleep interval length, a maximum sleep interval length, and listening interval information.

Upon receiving the sleeping request message from the first terminal (303), the base station (301) determines whether to allow the sleep mode switching of the first terminal (303). If the sleep mode switching of the first MS 303 is permitted, the BS 301 determines the first sleep interval length of the MS 1 (303) in consideration of sleep mode setting information desired by the MS 1 (303) The sleep mode management information such as the maximum sleep interval length, the listening interval length, the sleep ID, and the starting point of the sleep mode switching are determined.

In step 315, the base station 301 transmits a sleep response message including sleep mode switching permission and sleep mode management information to the first MS 303 through the cellular network.

When the sleep response message is received, the first subscriber station 303 confirms whether the sleep mode switch included in the sleep response message is allowed. If the base station permits the sleep mode switching, the terminal 1 (303) switches to the sleep mode according to the sleep mode management information. At this time, the MS 1 303 operates in the sleep mode for the first sleep interval included in the sleep response message (step 317).

In step 319, the terminal 1 (303) operates in a listening mode when the initial sleep interval is completed according to the listening interval information included in the sleep response message, and receives the traffic indication message from the base station (301). That is, the BS 301 transmits a traffic indication message indicating the presence or absence of traffic of the MS 1 303 to the MS 1 303 during the listening interval of the MS 1 303 in step 321.

At this time, the MS # 1 303 determines whether there is traffic to be transmitted to the terminals belonging to the SLPID group belonging to the SLPID in the traffic indication message. If the traffic exists, the terminal checks a traffic indication bitmap to check whether there is traffic to be transmitted to the terminal.

If there is traffic to be transmitted to the terminal 1 (303), the terminal 1 (303) switches to the active mode and receives the traffic. If there is no traffic to be transmitted to the terminal 1 (303), the terminal 1 (303) operates in the sleep mode for a sleep interval that is increased by a certain rate than the initial sleep interval length (step 323).

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

When the sleep mode search message is received from the terminal 2 (305) and the terminal 3 (307) through the P2P network during the sleep interval (step 323), the terminal 1 (303) The sleep mode switching between the terminal 2 305 and the terminal 3 307 is requested to the base station 301 through the cellular network in step 333. That is, the terminal 1 303 transmits a P2P sleep request message to the base station 301 requesting switching of the sleep mode to the terminal 2 (305) and the terminal 3 (307).

When the P2P sleep request message is received from the MS 1 (303), the BS 301 determines whether to allow the MS 2 (305) and the MS 3 (307) to switch the sleep mode. If the sleep mode switching of the second terminal 305 and the third terminal 307 is permitted, the base station 301 determines the sleep mode management information of the second terminal 305 and the third terminal 307. At this time, the BS 301 determines the sleep mode management information such that the terminal 2 (305) and the terminal 3 (307) operate in the sleep mode in the same manner as the terminal 1 (303). Here, the sleep mode management information includes the length of the initial sleep interval, the length of the maximum sleep interval, the length of the listening interval, the start time of the sleep mode change, and the sleep ID.

The base station 301 then transmits a P2P sleep response message including the sleep mode switching permission and sleep mode management information of the terminal 2 305 and the terminal 3 307 to the terminal 1 303 through the cellular network (Step 335).

When the P2P sleep response message is received through the cellular network during the listening interval (step 329), the terminal 1 (303) transmits a sleep mode response message to the terminal 2 (305) and the terminal 3 (307) via the P2P network (Step 337). Here, the sleep mode response message includes the sleep mode switch permission and the sleep mode management information.

In step 331, the MS 1 303 receives a traffic indication message transmitted by the BS 301 during the listening interval (step 329), and checks if there is traffic to be transmitted to the MS 301 (step 331).

If there is no traffic to be transmitted to the first terminal 303, the first terminal 303 operates in the sleep mode for a sleep interval that is increased by a certain rate than the previous sleep interval 323 (step 339). Here, the length of the sleep interval increases up to the maximum sleep interval and does not increase thereafter.

At this time, the terminal 2 (305) and the terminal 3 (307) switch 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 for the sleep interval having the same length as the terminal 1 (303) (steps 341 and 343).

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

Accordingly, the BS 301 transmits a traffic indication message indicating the presence or absence of traffic of the first MS 303, the second MS 305 and the third MS 307 to the MS 1, MS 303, 3 (307) (step 351).

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

4 illustrates 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.

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

In step 403, the terminal broadcasts a sleep mode search message to the P2P network in order to check if 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 the terminals constituting the P2P network.

In step 405, the MS determines whether a response signal for the sleep mode search message is received during a response wait time. Here, the response wait time is equal to the maximum sleep interval length when the terminal operates 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 MS proceeds to step 417 and requests the base station to switch to the sleep mode through the cellular network. At this time, the terminal transmits a sleep request message including sleep mode setting information such as a first sleep interval, a maximum sleep interval, and a listening interval information that the terminal desires to the base station.

In step 419, the MS determines whether a sleep response message is received from the BS through the cellular network.

If the sleep response message is received, the terminal determines whether the base station permits the switching to the sleep mode of the terminal in the sleep response message. If the BS permits the MS to switch to the sleep mode, the MS proceeds to step 407 and switches 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 point, a length of a first sleep interval, a length of a maximum sleep interval, and listening interval information.

Meanwhile, if a response message is received during the response waiting time, the terminal determines whether the base station permits the sleep mode switching of the terminal in the response message. If the base station permits the sleep mode switching of the terminal, the terminal proceeds to step 407 and switches to the sleep mode according to the sleep mode management information included in the response message. At this time, the sleep mode management information is the same as the sleep mode management information of the terminal that transmitted the response signal (hereinafter referred to as a representative terminal). Therefore, the terminal operates in the sleep mode in the same manner as the representative terminal. That is, the terminal transitions to the sleep interval 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 MS determines whether a sleep mode search message is received through the P2P network. That is, the terminal determines whether there is a terminal broadcasting a sleep mode search message for searching for a terminal operating in a sleep mode to switch the sleep mode through the P2P network. At this time, the terminal can identify the terminal that transmitted the sleep mode search message using the unique ID of the terminal included in the sleep mode search message.

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

In step 413, the MS determines whether a P2P sleep response message is received from the BS through the cellular network.

If the P2P sleep response message is received, the MS proceeds to step 415 and transmits information related to the sleep mode switching included in the P2P sleep response message to the MSs transmitting the sleep mode search message. Here, the information related to the sleep mode switching includes whether or not the sleep mode switch is allowed, and sleep mode management information. At this time, the sleep mode management information has the same information as the sleep mode management information of the terminal. At this time, the sleep IDs in the sleep mode management information are not equal to each other.

Thereafter, the terminal ends the algorithm.

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

The following description explains an operation method of the base station for managing the sleep mode of the terminals constituting the P2P network.

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 embodiment of the present invention.

Referring to FIG. 5, in step 501, the BS determines whether a sleep request message is received from a UE through a cellular network.

If the sleep request message is received, the BS proceeds to step 503 and determines whether to allow the sleep mode switch and the sleep mode management information for the UE. For example, the base station determines whether to allow the sleep mode switching of the terminal that transmitted the sleep request message. If the sleep mode switching of the terminal is allowed, the BS considers the length of the first sleep interval, the length of the maximum sleep interval, and the length of the listening interval desired by the terminal included in the sleep request message, And determines sleep mode management information for the sleep mode. Here, the sleep mode management information includes the start time of the sleep mode change of the terminal, the length of the first sleep interval, the length of the maximum sleep interval, the length of the listening interval, and the sleep ID information.

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

In step 507, the BS broadcasts a traffic indication message indicating whether there is traffic to be transmitted to the MS according to the listening interval information of the MS.

In step 509, the BS determines whether a P2P sleep request message is received from a representative MS operating in a sleep mode. Here, the representative terminal means a terminal that relays sleep mode switching of other terminals among the terminals operating in the sleep mode among the terminals constituting the P2P network to the base station. In addition, the P2P sleep request message includes information on the terminal requesting sleep mode switching to the representative terminal among the terminals constituting the P2P network.

If the P2P sleep request message is received, the BS proceeds to step 511 and determines whether the sleep mode change permission and sleep mode management information for the terminal requesting the sleep mode change to the representative terminal are determined. For example, the base station determines whether to allow switching of the sleep mode of the terminal requesting the sleep mode change. If the sleep mode switching of the terminal is allowed, the base station determines sleep mode management information for the terminal. At this time, the BS determines the sleep mode switching start time, the first sleep interval, the maximum sleep interval, and the listening interval information so that the terminal operates in the sleep mode in the same manner as the representative terminal.

In step 513, the BS transmits to the MS a sleep response message including sleep mode switching permission and sleep mode management information of the terminal requesting the sleep mode switching to the representative terminal.

If the sleep mode switching is permitted, the BS proceeds to step 515. In step 515, the BS determines whether presence or absence of traffic to be transmitted to the MS requesting switching to the sleep mode from the representative terminal and the representative terminal, according to the listening interval information of the representative terminal Gt; traffic indication message < / RTI > That is, since the terminal that requests the sleep mode switching to the representative terminal and the representative terminal operates in the same sleep mode, the base station can transmit the traffic indication message to the terminals at once.

Thereafter, the base station terminates the present algorithm.

In the above-described embodiment, when searching for a terminal operating in a sleep mode in a P2P network, the terminal determines whether a terminal operating in a sleep mode exists depending on whether a response signal to the sleep mode search message is received during a response wait time . If there is a representative terminal operating in the sleep mode, the representative terminal requests the sleep mode switching of the terminal to the base station. Thereafter, the representative terminal transmits a response message to the sleep mode search message to the terminal when the sleep mode switch request signal is received from the base station.

In another embodiment, when the sleep mode search message is received, the representative terminal transmits a response message to the sleep mode search message to recognize that there is a terminal operating in the sleep mode.

Hereinafter, the configuration of the terminal and the base station for controlling the sleep mode of the terminals constituting the P2P network will be described.

FIG. 6 shows a block configuration of a UE constituting a P2P network in a wireless communication system according to the present invention. Although the following description assumes that the UE uses Time Division Duplex (BSD), terminals using other communication schemes may be configured in the same manner.

6, the terminal includes a duplexer 601, a reception modem 603, a message processor 605, a controller 607, a P2P controller 609, a message generator 611, and a transmission modem 613 ).

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

The receiving modem 603 includes an RF receiving block, a demodulation block, a channel decoding block, and the like. The receiving modem 603 restores data from the signal provided from the duplexer 601 and transfers the data to the message processor 605. Here, the RF receiving block is composed of a filter and an RF preprocessor, and the demodulation block is composed of an FFT operator for extracting data on each subcarrier, and the channel decoding block includes a demodulator, a deinterleaver And a channel decoder.

The message processor 605 disassembles the signal received from the receiving 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 the base station via the cellular network. In addition, the message processor 605 provides the P2P control unit 609 with a signal received from another terminal through the P2P network.

The controller 607 controls the terminal so that the terminal can communicate with the base station through the cellular network. For example, when the terminal transitions to the sleep mode, it checks whether there is a terminal operating in the sleep mode among the terminals constituting the P2P network through the P2P control unit 609. [ If there is no terminal operating in the sleep mode, the controller 607 controls the message generator 611 to request the sleep mode switching to the BS through the cellular network. If the sleep response message transmitted from the base station is received from the message processor 605, the controller 607 determines whether the sleep mode switch included in the sleep response message is permitted. If the base station permits the sleep mode switching of the terminal, 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. Here, the sleep mode management information includes a sleep mode start time, a length of a first sleep interval, a length of a maximum sleep interval, a length of a listening interval, and sleep ID information.

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

If the terminal is a representative terminal, the control unit 607 requests the base station to switch the sleep mode of the terminals broadcasting the sleep mode search message provided from the P2P control unit 609 to the base station 611). When the P2P sleep response message transmitted from the BS is received from the message processor 605, the controller 607 provides the P2P sleep response message to the P2P controller 609. [

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

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

If there is a terminal operating in the sleep mode, the P2P controller 609 transmits a sleep mode response message received from the representative terminal of the terminals operating in the sleep mode to the message processor 605 through the controller 607 ).

In addition, when the sleep mode search message transmitted from the terminals constituting the P2P network is received from the message processor 605, the P2P controller 609 requests the base station to switch the sleep mode to the base station 607).

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

In response to the control of the P2P control unit 609, the message generation unit 611 generates a message for confirming whether there is a terminal operating in the idle mode among the terminals constituting the P2P network or a representative terminal operating in the idle mode, And generates a message requesting mode switching.

The transmission modem 613 includes a channel coding block, a modulation block, an RF transmission block, and the like. The transmission modem 613 converts the signal provided from the message generation unit 611 into a form for radio transmission and outputs it to the duplexer 601 .

The control unit 607 controls the message processing unit 605, the P2P control unit 609 and the message generating unit 611 as a protocol control unit. 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, these are separately configured to distinguish the respective functions. Accordingly, in the case of actual implementation, all of them can be processed by the control unit 607, and only a part of them can be processed by the control unit 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 Time Division Duplex (BSD), but BSs using other communication schemes may be configured in the same manner.

7, the base station includes a duplexer 701, a receiving modem 703, a message processor 705, a controller 707, a sleep mode determiner 709, a sleep mode controller 711, 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 method, and transmits a transmission signal (uplink signal) from the transmission modem 715 To the antenna.

The receiving modem 703 includes an RF receiving block, a demodulation block, a channel decoding block, and the like. The receiving modem 703 restores data from the signal provided from the duplexer 701 and transfers the data to the message processor 705. Here, the RF receiving block is composed of a filter and an RF preprocessor, and the demodulation block is composed of an FFT operator for extracting data on each subcarrier, and the channel decoding block includes a demodulator, a deinterleaver And a channel decoder.

The message processing unit 705 disassembles the signal received from the receiving modem 703 and provides the result to the controller 707. For example, the message processing unit 705 provides the control unit 707 with a signal received from the terminal through the cellular network.

The controller 707 controls the sleep mode of the terminal according to a signal received through the cellular network. For example, when the sleep request message is received from the message processor 705, the controller 707 controls the sleep mode deciding unit 709 to allow the sleep mode switching of the terminal that transmitted the sleep request message . When the P2P sleep request message is received from the message processor 705, the controller 707 controls the sleep mode deciding unit 709 to request the sleep mode switching to the representative terminal that has transmitted the P2P sleep request message It is judged whether or not to permit switching of the sleep mode of the terminal constituting the P2P network.

If the sleep mode switching is not permitted, the controller 707 controls the message generating unit 713 to transmit a sleep mode switching disable message to the terminal.

On the other hand, when the sleep mode switching of the terminal is allowed, the controller 707 controls the sleep mode controller 711 to determine the sleep mode management information for the terminal. Here, the sleep mode management information includes a sleep mode start time, a length of a first sleep interval, a length of a maximum sleep interval, a length of a listening interval, and a sleep ID.

When determining the sleep mode management information of the terminal that has transmitted the sleep request message, the sleep mode controller 711 determines whether the sleep mode management information is included in the sleep mode management information, considering the desired sleep mode setting information included in the sleep request message Determine information. Here, the sleep mode setting information includes the length of the first sleep interval, the length of the maximum sleep interval, and the length of the listening interval.

Meanwhile, when determining the sleep mode management information of the terminal that constitutes the peer-to-peer network requesting the sleep mode switching to the representative terminal that has transmitted the P2P sleep request message, the sleep mode control unit 711 determines that the sleep mode control unit 711 The sleep mode management information is determined so as to operate in the sleep mode.

The message generator 713 generates a message to be transmitted to the UEs under the control of the controller 707. For example, under the control of the controller 707, the message generator 713 generates a sleep response message or a P2P sleep response message including sleep mode switching information and sleep mode management information.

The transmission modem 715 includes a channel coding 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 radio transmission, and outputs the signal to a duplexer 701 .

The control unit 707 controls the message processing unit 705, the sleep mode determination unit 709, the sleep mode control unit 711, and the message generation unit 713 as a protocol control unit. That is, the control unit 707 may perform the functions of the message processing unit 705, the sleep mode determination unit 709, the sleep mode control unit 711, and the message generation unit 713. In the present invention, these are separately configured to distinguish the respective functions. Accordingly, in the case of actual implementation, all of them can be processed by the control unit 707, and only a part of them can be processed by the control unit 707. [

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. Accordingly, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims, and equivalents thereof.

1 is a diagram illustrating a procedure for controlling a sleep mode of a plurality of terminals constituting a P2P network in a conventional wireless communication system,

2 is a diagram showing 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 a sleep mode of terminals that constitute 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 a sleep mode of terminals of a P2P network in a wireless communication system according to an embodiment of the present invention;

6 is a diagram showing a block configuration of a terminal constituting a P2P network in a wireless communication system according to the present invention, and Fig.

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)

A method for a terminal of a wireless communication system to operate in a sleep mode, Determining a representative terminal among the terminals when a terminal operating in a sleep mode exists in a peer to peer (P2P) network; Requesting a sleep mode switching to a base station through the representative terminal; Confirming whether or not to accept a sleep mode conversion from the response signal when a response signal for a sleep mode change request is received from the base station through the representative terminal; And switching to the sleep mode according to the sleep mode management information included in the response signal when the sleep mode switch is accepted. The method according to claim 1, Wherein the step of identifying the terminal operating in the sleep mode comprises: Transmitting a sleep mode search signal to terminals constituting the P2P network; Determining whether a response signal to the sleep mode search signal is received during a response waiting time; And determining that there is a terminal operating in the sleep mode when the response signal is received during the response waiting time. The method according to claim 1, The sleep mode switching request may include: Determining a representative terminal among the terminals if there are at least two terminals operating in the sleep mode; And requesting the representative terminal to switch the sleep mode. The method according to claim 1, Wherein the sleep mode management information includes at least one of a sleep ID (Identification), a sleep mode switching time, a length of a first sleep interval, a length of a maximum sleep interval, and listening interval information. The method according to claim 1, The sleep mode management information includes at least one of a sleep mode switching point for performing a sleep mode, a length of a first sleep interval, a length of a maximum sleep interval, and listening interval information in the same manner as the terminal operating in the sleep mode Lt; / RTI > The method according to claim 1, The process of switching to the sleep mode comprises: And switching to a sleep mode in the same manner as the sleep mode terminal according to the sleep mode management information included in the response signal. The method according to claim 1, Requesting a base station to switch to a sleep mode when there is no terminal operating in a sleep mode in the P2P network; And switching to the sleep mode according to the sleep mode management information provided by the base station when the base station permits the sleep mode change. A method for a terminal of a wireless communication system to operate in a sleep mode, Transmitting a search signal to terminals constituting a peer-to-peer (hereinafter referred to as P2P) network to search for presence of a terminal operating in a sleep mode; Confirming whether a response signal for the search signal is received from the terminals during a response waiting time; Determining a representative terminal among the terminals when a response signal to the search signal is received during the response waiting time; Requesting a sleep mode switching to a base station through the representative terminal; Confirming whether or not the sleep mode conversion is acceptable in the response signal; And switching to the sleep mode according to the sleep mode management information included in the response signal when the sleep mode switch is accepted. 9. The method of claim 8, Wherein the sleep mode management information includes at least one of a sleep ID (Identification), a sleep mode switching time, a length of a first sleep interval, a length of a maximum sleep interval, and listening interval information. 9. The method of claim 8, The sleep mode management information includes at least one of a sleep mode switching point for performing a sleep mode, a length of a first sleep interval, a length of a maximum sleep interval, and listening interval information in the same manner as a terminal that transmits the response signal Lt; / RTI > 9. The method of claim 8, The process of switching to the sleep mode comprises: And switching the sleep mode to the sleep mode in the same manner as the terminal that has transmitted the response signal according to the sleep mode management information included in the response signal. 9. The method of claim 8, Requesting a base station to switch to a sleep mode when the response signal is not received during the response time; And switching to the sleep mode according to the sleep mode management information provided by the base station when the base station permits the sleep mode change. A method for a terminal of a wireless communication system to operate in a sleep mode, Determining whether a sleep mode switching request is received from the terminals constituting the point-to-point network when operating in the sleep mode; Requesting a sleep mode switching to the subscriber station from a base station when a sleep mode switch request is received from a predetermined subscriber station; And transmitting the response signal to the terminal when a response signal to the sleep mode switching request to the terminal is received from the base station. 14. The method of claim 13, The process of confirming the sleep mode change request includes: Determining if a search signal is received to search for a terminal operating in a sleep mode of the terminals constituting the point-to-point network; When the search signal is received, determining that the terminal that transmitted the search signal has requested the sleep mode switching. 14. The method of claim 13, The process of confirming the sleep mode change request includes: Determining if a search signal for searching for a terminal operating in a sleep mode is received from the terminals constituting the point-to-point network; Transmitting a response signal for the search signal to the terminal that transmitted the search signal when the search signal is received; And determining whether a sleep mode change request signal is received from the terminal. A method for controlling a sleep mode of a terminal performing Peer to Peer (P2P) communication in a base station of a wireless communication system, Determining whether to accept a sleep mode switching of the terminals when a sleep mode switching request signal is received from a representative terminal operating in a sleep mode for the other terminals constituting the P2P network, Determining sleep mode management information to allow the terminals to operate in the sleep mode in the same manner as the representative terminal when the sleep mode switching of the terminals is accepted; And transmitting the sleep mode management information to the representative terminal whether the sleep mode switching is permitted or not. 17. The method of claim 16, The sleep mode management information includes at least one of a sleep ID of each of the terminals, a sleep mode switching point for performing a sleep mode in the same manner as the representative terminal, a length of a first sleep section, a length of a maximum sleep section, Gt; a < / RTI > 1. A terminal apparatus for performing a Peer to Peer (P2P) communication in a wireless communication system, A P2P control unit for determining a representative terminal among the terminals when the terminal operates in the sleep mode in the P2P network and controlling the base station to request a sleep mode switching through the representative terminal; A message generator for generating a sleep mode change request message under the control of the P2P controller, And a transmitter for transmitting the message to the base station through the representative terminal. 19. The method of claim 18, The P2P control unit broadcasts a search signal to the P2P network to control whether a terminal operating in a sleep mode exists, And controls the terminal to request a sleep mode switching if there is a terminal operating in the sleep mode. 20. The method of claim 19, Wherein the P2P control unit controls the representative terminal of the terminals to request switching to the representative terminal when there are at least two terminals operating in the sleep mode. 19. The method of claim 18, Further comprising a receiver for receiving a response signal in response to a sleep mode switching request from the terminal through the P2P network, Wherein the P2P control unit controls the switching to the sleep mode according to the sleep mode management information included in the response signal when the sleep mode switching request is accepted by accepting the sleep mode switch request from the response signal. . 22. The method of claim 21, Wherein the P2P control unit controls to operate in the same sleep mode as the terminal that has transmitted the response signal according to the sleep mode management information included in the response signal when the sleep mode switch is accepted. 22. The method of claim 21, Wherein the receiving unit receives a signal through the P2P network or the cellular network. 22. The method of claim 21, Wherein the sleep mode management information includes at least one of a sleep ID, a sleep mode switching time, a length of a first sleep interval, a length of a maximum sleep interval, and a listening interval information. 19. The method of claim 18, Further comprising a control unit for controlling the base station to request the switching of the sleep mode when the terminal operating in the sleep mode does not exist in the P2P network, Wherein the P2P control unit controls the control unit to request the base station to switch to the sleep mode when the subscriber station operating in the sleep mode does not exist in the P2P network. 1. A terminal apparatus for performing a Peer to Peer (P2P) communication in a wireless communication system, A sleep mode switching request signal from the terminals constituting the P2P network through the P2P network when the sleep mode is operated; A controller for controlling the base station to switch the sleep mode to the base station when the sleep mode switching request signal is received; And a transmitter for transmitting a sleep mode change request signal to the base station through the cellular network under the control of the controller. 27. The method of claim 26, The receiving unit receives the sleep mode switching request signal from the terminals constituting the P2P network through the P2P network, And receives a response signal for the sleep mode change request signal from the base station through the cellular network. 27. The method of claim 26, Wherein the transmission unit transmits a sleep mode change request signal to the base station through the cellular network, And transmits a response signal received from the base station through the P2P network to the terminal requesting the sleep mode switching. A base station apparatus in a wireless communication system, A receiver for receiving a sleep mode change request signal from a terminal performing Peer to Peer (P2P) communication; When receiving a sleep mode switching request signal from the representative terminal operating in the sleep mode for the other terminals constituting the P2P network, determines whether to accept the sleep mode switching of the terminals, and accepts the sleep mode switching of the terminals A controller for determining sleep mode management information of the terminals, And a transmitter for transmitting a signal including the sleep mode switching permission and the sleep mode management information to the representative terminal. 30. The method of claim 29, Wherein, A sleep mode decision unit for deciding whether to accept the sleep mode switching of the terminals, And a sleep mode control unit for determining the sleep mode management information of the terminals when the sleep mode switching of the terminals is accepted. 31. The method of claim 30, Wherein the sleep mode control unit determines sleep mode management information enabling the terminals to operate the sleep mode in the same manner as the representative terminal. 31. The method of claim 30, The sleep mode control unit may include at least one of a sleep ID of each of the terminals, a sleep mode switching point for performing a sleep mode in the same manner as the representative terminal, a length of a first sleep interval, a length of a maximum sleep interval, And determines sleep mode management information including the sleep mode management information.

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