KR20100049237A - Apparatus and method for establishing peer to peer connection in a cellular wireless communication system - Google Patents

Abstract

PURPOSE: An apparatus and a method for establishing peer to peer connection in a cellular wireless communication system are provided to minimize an effect to the cellular wireless communication system by activating the peer to peer receiver terminal. CONSTITUTION: An interpreter(724) confirms the selection result about the P2P(peer to peer) receiver terminal through the first message for informing the selection result about the P2P receiver terminal. A transmitter(722) transmits the second messages including parameters for the base station mode switching to the P2P transmitter terminal. A controller(732) makes the P2P receiver terminal handover with the P2P transmitter terminal. The terminal device comprises a controller and the transmitter transmitting the second message for informing the reception of the first message.

Description

Apparatus and method for establishing a peer-to-peer connection in a cellular wireless communication system {APPARATUS AND METHOD FOR ESTABLISHING PEER TO PEER CONNECTION IN A CELLULAR WIRELESS COMMUNICATION SYSTEM}

The present invention relates to a cellular wireless communication system, and more particularly, to an apparatus and method for establishing a peer to peer (P2P) connection in a cellular wireless communication system.

In general, in a cellular wireless communication system, a terminal performs direct communication with the base station using a radio resource managed by the base station. In other words, in order for the two terminals to communicate with each other, the two terminals must establish a connection with the base station and be allocated uplink and downlink radio resources from the base station. The base station transmits data received from one terminal through a corresponding connection to another terminal through a separate connection. Another way in which two terminals communicate with each other is a peer to peer (P2P) scheme. The P2P forms a direct connection between the two terminals to perform communication, and the two terminals directly transmit and receive signals with each other.

As an example of a wireless communication system supporting the P2P, Institute of Electrical and Electronics Engineers (IEEE) 802.11. Ad hoc mode, IEEE 802.15.1, IEEE 802.15.2, DMO (Direct Mode Operation) of Trans-European Trunked RAdio (TETRA) system, and Wireless World Initiative NEw Radio (WINNER) system.

IEEE 802.11. According to the method of performing direct communication between terminals using an ad hoc mode or an unlicenced band such as Bluetooth, communication quality is exchanged due to competition between terminals without the concept of dedicated resources. This is not guaranteed. In addition, each terminal should be provided with an additional RF (Radio Frequency) module in order to use the unlicensed band, so that P2P communication is possible only between terminals having the RF module. In addition, in the case of the WINNER system, since a dedicated resource for P2P communication is allocated, the amount of resources to be used by cellular communication is reduced.

As described above, conventional P2P communication schemes have a problem in that communication quality is not guaranteed or consumes resources of a cellular system. Therefore, a reasonable P2P communication method that solves the problems of the conventional P2P communication methods should be proposed.

Accordingly, an object of the present invention is to provide an apparatus and method for performing peer to peer (P2P) communication with a minimal effect on cellular communication in a broadband wireless communication system.

Another object of the present invention is to provide an apparatus and method for performing P2P communication that ensures excellent communication quality in a broadband wireless communication system.

Another object of the present invention is to provide an apparatus and method for identifying a sender terminal of a P2P communication and a terminal capable of P2P communication in a broadband wireless communication system.

Another object of the present invention is to provide an apparatus and method for performing P2P communication by operating as a base station of a sender terminal of P2P communication in a broadband wireless communication system.

Another object of the present invention is to provide an apparatus and method for transmitting parameters necessary for a transmitter terminal of a P2P communication to switch to a base station mode in a broadband wireless communication system.

According to a first aspect of the present invention for achieving the above object, a method of operating a peer to peer (P2P) sender terminal in a broadband wireless communication system, the first message for notifying the selection result for the P2P receiver terminal to the base station And receiving a second message including parameters for base station mode switching from the base station, switching to the base station mode using the parameters, operating as a base station, and operating as a base station. It characterized in that it comprises a process of performing communication.

According to a second aspect of the present invention for achieving the above object, the P2P communication support method of the base station in a broadband wireless communication system, the P2P receiver via a first message for notifying the result of the selection of the P2P receiver terminal of the P2P sender terminal Checking a selection result for the terminal, transmitting a second message including parameters for switching a base station mode to the P2P sender terminal, and handing over the P2P receiver terminal to the P2P sender terminal; Characterized in that.

According to a third aspect of the present invention for achieving the above object, a method of operating a P2P receiver terminal in a broadband wireless communication system, the second message for notifying the reception of the first message for determining whether P2P communication from the P2P sender terminal And transmitting a handover to the P2P sender terminal, and performing a P2P communication with the P2P sender terminal when the handover is instructed by the base station.

According to a fourth aspect of the present invention for achieving the above object, a terminal apparatus in a broadband wireless communication system, a transmitter for transmitting a first message to inform the base station of the selection result for the P2P receiver terminal, and the base station mode from the base station A receiver for receiving a second message including parameters for switching, and a controller for switching to the base station mode using the parameters and operating as a base station and performing P2P communication with the P2P receiver terminal. do.

According to a fifth aspect of the present invention for achieving the above object, in a broadband wireless communication system, a base station apparatus selects the P2P receiver terminal through a first message for informing the result of the selection of the P2P receiver terminal of the P2P sender terminal. A parser for confirming a result, a transmitter for transmitting a second message including parameters for base station mode switching to the P2P sender terminal, and a controller for handing over the P2P receiver terminal to the P2P sender terminal. do.

According to a sixth aspect of the present invention for achieving the above object, a terminal device in a broadband wireless communication system, a transmitter for transmitting a second message for notifying the reception of the first message for determining whether P2P communication from the P2P sender terminal And, if the handover is instructed from the base station, after performing the handover to the P2P sender terminal, characterized in that it comprises a controller for performing P2P communication with the P2P sender terminal.

In a broadband wireless communication system, a peer-to-peer (P2P) sender terminal operates as a base station, so that the terminals can perform P2P communication to minimize the influence on the cellular system.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of 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 performing peer-to-peer (P2P) communication that minimizes the impact on cellular communication and ensures excellent communication quality. Hereinafter, the present invention will be described using an Orthogonal Frequency Division Multiplexing (OFDM) / Orthogonal Frequency Division Multiple Access (OFDMA) scheme as an example. The same applies to other wireless communication systems.

For the description of the P2P communication setting process according to the present invention, assume the situation as shown in FIG. Referring to FIG. 1, a terminal A 110, a terminal B 120, a terminal C 130, and a terminal D 140 exist in a cell of the base station 100. The terminal B 120 and the terminal C 130 are located in an area capable of P2P communication with the terminal A 110, but the terminal D 140 is out of an area capable of P2P communication with the terminal A 110. .

 At this time, the terminal A (110) intends to perform P2P communication. For example, the terminal A 110 wants P2P communication with a specific terminal or wants to receive specific contents from another terminal. In the following description, it is assumed that the specific terminal or the terminal having the specific content is the terminal B (120). In the situation as shown in FIG. 1, the P2P communication setting between the terminal A 110 and the terminal B 120 is performed as shown in FIG. 2.

Referring to FIG. 2, the terminal A 110 transmits a connection request (connection_REQ) message to the base station 110 to inform that it wants a P2P connection (step 201). In this case, the connection request message may have a form of a general MAC management message or a codeword transmitted through a physical channel such as a channel quality indicator (CQI) channel. In addition, when the terminal A (110) wants P2P communication with a specific terminal, the connection request message may include identification information of the specific terminal.

Upon receiving the connection request message, the base station 100 broadcasts a P2P setup preparation (P2P_setup_ready) message for notifying the terminals in the cell that P2P communication is requested (step 203). The P2P establishment preparation message is a message designed for informing the occurrence of a P2P communication request. However, in place of the P2P setup preparation message, the base station 100 may notify the occurrence of the P2P communication request by using a specific field in a broadcast message such as a paging message.

The terminal B 120, the terminal C 130, and the terminal D 140 that have received the P2P configuration preparation message recognize that a P2P communication request has occurred, and switch to a P2P active mode ( Step 205). In other words, the terminal B 120, the terminal C 130 and the terminal D 140 waits for a message from the requester of the P2P communication. At this time, the terminal that cannot perform P2P communication does not switch to the P2P active mode. For example, when communicating with the base station 100, the terminal does not switch to the P2P active mode.

Subsequently, the terminal A 110 transmits a P2P neighbor relay request message to determine whether P2P communication of other terminals is possible (step 207). That is, the terminal B 120, the terminal C 130, and the terminal D 140 determine whether P2P communication with the terminal A 110 is possible through the PNR request message. In this case, the PNR request message is transmitted through a predetermined resource or through a resource allocated by the base station 100 due to the connection request message. Accordingly, the terminal B 120, the terminal C 130, and the terminal D 140 operating in the P2P active mode may know the resource to which the PNR request message is transmitted and receive the PNR request message. Try. Here, the PNR request message includes the identifier of the terminal A (110), transmission power, and information about a P2P communication target. The information about the P2P communication target may be an identifier of the specific terminal when the P2P communication with the specific terminal is desired, or an identifier of the specific content when the specific content is desired. In this case, as shown in FIG. 1, the terminal D 140 cannot receive the PNR request message because it is out of an area in which the terminal A 110 can communicate with the terminal A 110.

Upon receiving the PNR request message, the terminal B 120 and the terminal C 130 transmit a PNR response message to the base station 100 (step 209). That is, only the terminal that receives the PNR request message transmits the PNR response message. In this case, the PNR response message may have a simple acknowledgment (ACK) message or may include information about a P2P communication request. For example, the information about the P2P communication request includes information on whether P2P communication is possible, specific content related information, and the like.

Upon receiving the PNR response messages, the base station 100 transmits a P2P list message to the terminal A 110 (step 211). The P2P list message includes identifiers of terminals capable of P2P communication with the terminal A 110 and P2P communication related information about each of the terminals. For example, the P2P communication related information includes transmission / reception power during P2P communication with each of the terminals, specific content related information for each of the terminals, whether a telephone call can be received for each of the terminals, and the like. It includes.

Upon receiving the P2P list message, the terminal A 110 identifies terminals capable of P2P communication with itself through the P2P list message and selects a callee of P2P communication. In this case, when P2P communication with a specific terminal is desired, the terminal A 110 selects the specific terminal, and when a specific content is desired, the terminal A 110 selects a terminal having the specific content. The terminal A 110 transmits a P2P selection notification message for notifying the base station 100 of the selection result of the receiver (step 213). In this case, it is assumed that the terminal B 120 is selected.

Upon receiving the P2P selection notification message, the base station 100 transmits a P2P base station message for transmitting parameters necessary for operating the terminal A 110 in the base station mode (step 215). For example, the parameters required to operate in the base station mode are shown in Table 1 below.

parameter Explanation Cell ID PLMN ID Tracking Area ID (s) EARFCN (UL and DL) Mode of operation TDD / FDD / HD-FDD UL and DL Channel BW, per EARFCN CP length (normal, extended) Cell reserved for Operator use yes / no Access Class Barring MAX Tx Power MIN Tx Power Polling configuration UL / DL subframe allocation for TDD length of special subframe patterns for TDD

Upon receiving the P2P base station message, the terminal A 110 switches to the base station mode using the parameters (step 217). The base station mode is a mode in which a terminal operates like a base station within a range necessary for P2P communication, and refers to an operation state of a terminal that can be recognized as a base station from another terminal. That is, the terminal A 110 operates like a base station by performing operations such as preamble transmission and map message transmission. Therefore, when the terminal A 110 operates in the base station mode, the terminal B 120 recognizes the terminal A 110 as one base station.

After the terminal A 110 switches to the base station mode, the base station 110, the terminal A 110, and the terminal B 120 perform a handover procedure (step 219). In other words, the base station 110 and the terminal A 110 handovers the terminal B 120 from the base station 110 to the terminal A 110 through a base station-driven handover procedure. In detail, the base station 100 transmits a handover notification message including information about the terminal B 120 to the terminal A 110, and the terminal A 110 transmits a handover notification message. In step 100, a handover notification response message is transmitted to indicate that the handover is accepted. Subsequently, the base station 100 transmits a base station handover request (MOB_BSHO-REQ) message including the identifier of the terminal A 110 to the terminal B 120 and the terminal B ( 120 scans a neighbor base station. As a result of the scan, the terminal B 120 discovers the terminal A 110 and a base station handover response (MOB_BSHO-RSP: MOBile Base Station HandOver Response) message for notifying that the base station 100 accepts the handover. Send. Accordingly, the base station 100 transmits a handover notification confirm message to the terminal A 110, and the terminal B 120 instructs the handover to release the connection to the base station 110. (MOB_HO_IND: MOBile HandOver INDication) message is sent. Thereafter, the terminal A 110 transmits a fast ranging information element (IE) to the terminal B 120. Subsequently, the terminal B 120 completes a network entry to the terminal A 110 by performing a ranging procedure.

After completing the P2P communication setup, the terminal A 110 and the terminal B 120 exchange P2P traffic with each other (step 221). That is, the terminal A 110 operates as a base station, and the terminal B 120 operates as a terminal connected to the terminal A 110 and exchanges P2P traffic. In this case, the P2P communication between the terminal A 110 and the terminal B 120 may be performed using only resources in a limited area. That is, in order to control interference to cellular communication due to P2P communication, the physical range of resources for the P2P communication may be limited.

Hereinafter, the operation and configuration of a terminal and a base station for establishing a P2P communication connection as described above will be described in detail with reference to the accompanying drawings.

3 is a flowchart illustrating an operation procedure of a P2P sender terminal in a broadband wireless communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 3, the terminal determines whether P2P communication is necessary in step 301. For example, when a P2P communication is requested by a user or a preset specific condition is satisfied, the terminal determines that the P2P communication is necessary.

If the P2P communication is required, the terminal proceeds to step 303 to request a P2P communication connection to the base station. In this case, the terminal requests the P2P communication connection by using a connection request message in the form of a general MAC management message or by using a codeword transmitted through a physical channel. Here, the connection request message may include identification information of the specific receiver terminal.

After requesting the P2P communication connection, the terminal proceeds to step 305 and transmits a PNR request message for determining whether P2P communication of other terminals is possible. In this case, the terminal transmits the PNR request message through a predetermined resource or through a resource allocated by the base station. If the PNR request message is transmitted through the resources allocated by the base station, although not shown, the terminal checks the resource for transmitting the PNR request message through the map message received from the base station, and then the PNR. Send the request message. Here, the PNR request message includes the identifier of the terminal A (110), transmission power, and information about a P2P communication target. The information about the P2P communication target may be an identifier of the specific terminal when the P2P communication with the specific terminal is desired, or an identifier of the specific content when the specific content is desired.

After transmitting the PNR request message, the terminal proceeds to step 307 to check whether a P2P capable terminal list is received from the base station. The P2P capable terminal list is received through a P2P list message and includes an identifier of at least one terminal capable of P2P communication and P2P communication related information about the at least one terminal. For example, the P2P communication related information includes transmission / reception power during P2P communication with each of the terminals, specific content related information for each of the terminals, and whether a telephone call can be received for each of the terminals.

When the P2P capable terminal list is received, the terminal proceeds to step 309 to select a P2P receiver terminal from the P2P capable terminal list. In other words, the terminal identifies terminals capable of P2P communication with itself through the P2P capable terminal list and selects a receiver of P2P communication. In this case, when P2P communication with a specific terminal is desired, the terminal selects the specific terminal, and when a specific content is desired, the terminal selects a terminal having the specific content. The terminal informs the base station of the selection result.

After notifying the selection result of the P2P receiver terminal, the terminal proceeds to step 311 and checks whether parameters for switching the base station mode are received from the base station. The parameters are received via a P2P base station message and include the parameters shown in Table 1.

When the parameters for switching the base station mode are received, the terminal proceeds to step 313 to switch to the base station mode using the parameters. That is, the terminal operates like a base station by performing operations such as preamble transmission and map message transmission. For this reason, other terminals recognize the terminal as one base station.

In step 315, the terminal performs a handover procedure as a target base station. In detail, when a handover notification message including information about the receiver terminal is received from the base station, the terminal transmits a handover notification response message for notifying that the handover is accepted. Thereafter, when the handover notification confirmation message is received from the base station, the terminal transmits a fast ranging IE to the receiver terminal and processes a network entry procedure such as a ranging procedure.

After performing the handover procedure, the terminal proceeds to step 317 to perform P2P communication with the receiver terminal. In this case, the terminal operates like a base station and exchanges P2P traffic. In this case, the P2P communication may be performed using only resources in a limited area.

4 is a flowchart illustrating an operation procedure of a P2P receiver terminal in a broadband wireless communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 4, the terminal checks whether a P2P communication connection request has been notified from the base station in step 401. At this time, the occurrence of the P2P communication connection request is notified through a P2P setup preparation message designed for the purpose of informing the occurrence of the P2P communication request, or by using a specific field in a message broadcasted as a paging message.

When the occurrence of the P2P communication connection request is notified, the terminal proceeds to step 403 to determine whether P2P communication is possible. For example, when communicating with a base station, the terminal determines that P2P communication is not possible. The criterion for determining whether the P2P communication is possible is determined by the intention of the system operator, and is not limited to the example described above. If the P2P communication is not possible, the terminal terminates this procedure.

On the other hand, if the P2P communication is possible, the terminal proceeds to step 405 and attempts to receive the PNR request message. If the PNR request message is transmitted through a predetermined resource, the terminal attempts to receive the PNR request message by decoding a signal received through the predetermined resource. On the other hand, when the PNR request message is transmitted through a resource allocated by a base station, although not shown, the terminal checks the resource for transmitting the PNR request message through a map message received from the base station, and then confirms the identified resource. Attempt to receive the PNR request message by decoding the signal received via.

In step 407, the terminal determines whether the reception of the PNR request message is successful. That is, the terminal confirms that an error does not occur as a result of the decoding and that a PNR request message of a promised format is obtained. Here, the PNR request message includes an identifier of the sender terminal, transmission power, and information on a P2P communication target. The information about the P2P communication target may be an identifier of the specific terminal when the P2P communication with the specific terminal is desired, or an identifier of the specific content when the specific content is desired. If the reception of the PNR request message fails within a predetermined time, the terminal terminates this procedure.

In contrast, if the PNR request message is successfully received, the terminal proceeds to step 409 and notifies the base station of the reception of the PNR request message. In this case, the terminal may notify only a simple acknowledgment, or may transmit information on the P2P communication request together. For example, the information about the P2P communication request includes information on whether P2P communication is possible, specific content related information, and the like.

In step 411, the terminal determines whether a handover instruction is generated from the base station. That is, the terminal checks whether the base station-driven handover is started. In other words, the terminal checks whether a base station handover request message including an identifier of the sender terminal is received from the base station. If the handover instruction does not occur for a predetermined time, the terminal terminates this procedure.

On the other hand, when the handover instruction occurs, the terminal proceeds to step 413 to perform a handover procedure as a terminal. In detail, after receiving a base station handover request message, the terminal scans a neighbor base station. As a result of the scan, the terminal finds the sender terminal and transmits a base station handover response message to inform the base station of accepting the handover. The terminal transmits a handover instruction message for disconnection to the base station. Thereafter, when the fast ranging IE is received from the sender terminal, the terminal performs a network entry procedure such as a ranging procedure.

After performing the handover procedure, the terminal proceeds to step 415 to perform P2P communication with the sender terminal. At this time, the terminal operates as a terminal and exchanges P2P traffic. In this case, the P2P communication may be performed using only resources in a limited area.

5 is a flowchart illustrating an operation procedure of a base station in a broadband wireless communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 5, the base station determines whether a P2P connection request is generated from the sender terminal in step 501. At this time, the P2P connection request is generated by using a connection request message in the form of a general MAC management message or by using a codeword transmitted through a physical channel. Here, the connection request message may include identification information of the specific receiver terminal.

When the P2P connection request occurs, the base station proceeds to step 503 to notify the terminals in the cell P2P communication connection request. In other words, the base station broadcasts a message indicating the generation of the P2P communication connection request to the terminals in the cell. In this case, the base station notifies the occurrence of the P2P communication connection request through a P2P setup preparation message designed for notifying the occurrence of the P2P communication request or by using a specific field in a message broadcasted, such as a paging message.

After notifying of the occurrence of the P2P communication connection request, the base station proceeds to step 505 and determines whether the reception of the PNR request message is received from at least one terminal. In this case, the reception notification of the PNR request message may be performed through a simple acknowledgment message, or may be performed through a message additionally including information about a P2P communication request. For example, the information about the P2P communication request includes information on whether P2P communication is possible, specific content related information, and the like. If the reception of the PNR request message is notified for a predetermined time, the base station terminates this procedure.

On the contrary, if the reception of the PNR request message is received from at least one terminal, the base station proceeds to step 507 and transmits a P2P communication capable terminal list to the sender terminal. In other words, the base station transmits the P2P capable terminal list through a P2P list message including an identifier of at least one terminal notifying the reception of the PNR request message. The P2P list message includes an identifier of at least one terminal capable of P2P communication and P2P communication related information about the at least one terminal. For example, the P2P communication related information includes transmission / reception power during P2P communication with each of the terminals, specific content related information for each of the terminals, and whether a telephone call can be received for each of the terminals.

After transmitting the P2P communication capable terminal list, the base station proceeds to step 509 and checks whether a result of selecting a P2P receiver is received from the sender terminal. If the selection result is not received for a predetermined time, the base station terminates this procedure.

On the other hand, when the selection result is received, the base station proceeds to step 511 and transmits the parameters for switching the base station mode of the sender terminal. The parameters are received via a P2P base station message and include the parameters shown in Table 1.

In step 513, the base station performs a handover procedure as a serving base station. That is, the base station hands over the receiver terminal selected by the sender terminal to the sender terminal through a handover procedure. In detail, the base station transmits a handover notification message including information about the receiver terminal to the sender terminal. When a handover notification response message is received from the sender terminal informing that the handover is accepted, the base station transmits a base station handover request message including the identifier of the sender terminal to the receiver terminal. Thereafter, when a base station handover response message is received from the receiver terminal indicating that the handover is accepted, the base station transmits a handover notification confirmation message to the sender terminal. When the handover instruction message for disconnection is received from the receiver terminal, the base station releases the connection with the receiver terminal.

6 is a block diagram of a terminal in a broadband wireless communication system according to an exemplary embodiment of the present invention.

Referring to FIG. 6, the terminal includes an encoder 602, a symbol modulator 604, a subcarrier mapper 606, an OFDM modulator 608, a radio frequency (RF) transmitter 610, an RF receiver 612, OFDM demodulator 614, subcarrier mapper 616, symbol demodulator 618, decoder 620, data buffer 622, message generator 624, message interpreter 626, codeword generator 628 , P2P controller 630 is configured.

The encoder 602 performs channel coding on the information bit stream provided from the data buffer 622 and the message generator 624. The symbol modulator 604 converts the channel coded bit stream into complex symbols by demodulating. The subcarrier mapper 606 maps the complex symbols to the frequency domain. In particular, the subcarrier mapper 606 maps the physical signal sequence provided from the codeword generator 628 to a predetermined resource. In particular, when transmitting a PNR request message, the subcarrier mapper 606 maps the PNR request message to a predetermined resource or to a resource allocated by the base station. The OFDM modulator 608 converts complex symbols mapped to the frequency domain into a time domain signal through an inverse fast fourier transform (IFFT) operation, and configures OFDM symbols by inserting a cyclic prefix (CP). The RF transmitter 610 up-converts the baseband signal into a downlink band signal and transmits it through an antenna.

The RF receiver 612 down converts a downlink band signal received through an antenna into a baseband signal. The OFDM demodulator 614 divides the signal provided from the RF receiver 612 in OFDM symbol units, removes a CP, and restores complex symbols mapped to a frequency domain through a fast fourier transform (FFT) operation. . The subcarrier demapper 616 classifies complex symbols mapped to the frequency domain into processing units. The symbol demodulator 618 converts the complex symbols into a bit string by demodulating the complex symbols. The decoder 612 restores an information bit string by channel decoding the bit string. The data buffer 622 stores data transmitted and received through cellular communication and P2P communication, and provides the stored data to the encoder 602 under the control of the P2P controller 630.

The message generator 624 generates a control message to be transmitted to the base station and other terminals. In particular, when the terminal operates as a P2P sender terminal, the message generator 624 is a connection request message for a P2P connection request, a PNR request message for determining whether P2P communication is possible, and a P2P for notifying the selection result of the P2P receiver terminal. Generate control message for selection result message and handover procedure. On the other hand, when the terminal operates as a P2P receiver terminal, the message generator 624 generates a PNR response message for notifying the reception of the PNR request message and control messages for a handover procedure.

The message interpreter 626 confirms the information included in the control message by interpreting the control message received from the base station and other terminals. In particular, when the terminal operates as a P2P sender terminal, the message parser 626 is a P2P list message for informing the list of P2P communication capable terminals, a P2P base station message for transferring parameters for base station mode switching, and a handover procedure Interpret control messages for On the other hand, when the terminal operates as a P2P receiver terminal, the message analyzer 626 controls the P2P establishment preparation message for notifying the occurrence of the P2P connection request, the PNR request message for determining whether P2P communication is possible, and the handover procedure. Interpret the messages. The message interpreter 626 provides the confirmed information to the P2P controller 630.

The codeword generator 628 generates a physical signal string in the form of a codeword transmitted over a predetermined physical channel. For example, the physical channel may be a CQI channel for CQI feedback. In particular, when a P2P connection request is performed through the physical signal string in the codeword form, the codeword generator 628 generates a physical signal string including a codeword for the P2P connection request according to the instruction of the P2P controller 630. And the physical signal sequence to the subcarrier mapper 606.

The P2P controller 630 controls the overall function for P2P communication of the terminal. First, when the terminal operates as a P2P sender terminal, the operation of the P2P controller 630 will be described. When P2P communication is requested by a user or when a predetermined predetermined condition is satisfied, the terminal operates as the P2P sender terminal. In this case, the P2P controller 630 requests the P2P communication connection to the base station by controlling the message generator 624 or the codeword generator 628. Thereafter, the P2P controller 630 transmits a PNR request message for determining whether P2P communication of other terminals is possible through the message generator 624. After transmitting the PNR request message, when the P2P capable terminal list is received from the base station, the P2P controller 630 selects a P2P receiver terminal from the P2P capable terminal list. In this case, when P2P communication with a specific terminal is desired, the P2P controller 630 selects the specific terminal, and when a specific content is desired, the terminal selects a terminal having the specific content. The P2P controller 630 notifies the base station of a selection result through the message generator 624. When parameters for base station mode switching are received from the base station, the P2P controller 630 proceeds to switch to the base station mode using the parameters, performs a handover procedure as a target base station, and performs a P2P communication with a P2P receiver terminal. Do this. In this case, the P2P communication may be performed using only resources in a limited area.

Next, when the terminal operates as a P2P receiver terminal, the operation of the P2P controller 630 will be described. When the P2P communication connection request is notified from the base station, the terminal operates as a P2P receiver terminal. At this time, the occurrence of the P2P communication connection request is notified through a P2P setup preparation message designed for the purpose of informing the occurrence of the P2P communication request, or by using a specific field in a message broadcasted as a paging message. When the P2P communication connection request is generated, if the P2P communication is possible, the P2P controller 630 attempts to receive the PNR request message. If the PNR request message is transmitted through a predetermined resource, the P2P controller 630 controls the subcarrier mapper 616 to extract a signal received through the predetermined resource, and the decoder Verify that the PNR request message is recovered from the signal extracted by 620. On the other hand, when the PNR request message is transmitted through a resource allocated by a base station, the P2P controller 630 receives a signal received through the resource for transmitting the PNR request message identified by the message interpreter 624. The subcarrier mapper 616 is controlled to extract, and it is checked whether the PNR request message is recovered from the signal extracted by the decoder 620. Upon successful reception of the PNR request message, the P2P controller 630 notifies the base station of receipt of the PNR request message through the message generator 624 and checks whether a handover instruction is generated from the base station. When the handover instruction occurs, the P2P controller 630 performs a handover procedure as a terminal and performs P2P communication with a P2P sender terminal. In this case, the P2P communication may be performed using only resources in a limited area.

7 is a block diagram of a base station in a broadband wireless communication system according to an exemplary embodiment of the present invention.

As shown in FIG. 7, the base station includes an RF receiver 702, an OFDM demodulator 704, a subcarrier demapper 706, a symbol demodulator 708, a decoder 710, a data buffer 712, Encoder 714, symbol modulator 716, subcarrier mapper 718, OFDM modulator 720, RF transmitter 722, message interpreter 724, message generator 726, codeword detector 728, scheduler 730, the P2P controller 732 is configured.

The RF receiver 702 down converts a downlink band signal received through an antenna into a baseband signal. The OFDM demodulator 704 divides the signal provided from the RF receiver 702 in OFDM symbol units, removes CP, and restores complex symbols mapped to the frequency domain through an FFT operation. The subcarrier demapper 706 classifies complex symbols mapped to a frequency domain into processing units. The symbol demodulator 708 converts the complex symbols into bit strings by demodulating the complex symbols. The decoder 710 restores an information bit string by channel decoding the bit string.

The data buffer 712 stores data transmitted and received with the terminals, and provides the stored data to the encoder 714 according to the instructions of the scheduler 730. The encoder 714 channel-codes the information bit string provided from the data buffer 712 and the message generator 726. The symbol modulator 716 converts the channel coded bit string into complex symbols. The subcarrier mapper 718 maps the complex symbols to a frequency domain according to a resource allocation result of the scheduler 730. The OFDM modulator 720 converts the complex symbols mapped to the frequency domain into a time domain signal through an IFFT operation, and configures OFDM symbols by inserting a CP. The RF transmitter 722 up-converts the baseband signal into a downlink band signal and transmits it through an antenna.

The message interpreter 724 confirms the contents of the control message by interpreting the control message received from the terminal. In particular, the message parser 724 may include a connection request message for a P2P connection request of a terminal, a PNR response message for notifying reception of a PNR request message, a P2P selection notification message for notifying a selection result of a P2P receiver terminal, and handover Interpret control messages for the procedure. In addition, the message interpreter 724 provides the checked contents to the P2P controller 732.

The message generator 726 generates a control message to be transmitted to the terminal. For example, the message generator 726 generates a map message for notifying the resource allocation result. Particularly, the message generator 726 is a P2P setup preparation message for notifying generation of a P2P communication connection request under the control of the P2P controller 732, a P2P list message for informing a P2P communication capable terminal list, and a base station mode switch. Generate P2P base station message for conveying parameters and control messages for handover procedure.

The codeword detector 728 detects a codeword from a physical signal sequence received through a predetermined physical channel. For example, the physical channel may be a CQI channel for CQI feedback. In particular, when the P2P connection request is performed through the physical signal string in the codeword form, if the detected codeword is a codeword for the P2P connection request, the codeword detector 728 generates the P2P connection request. To the P2P controller 732.

The scheduler 730 allocates radio resources to the terminals. That is, the scheduler 730 determines the priority among the terminals and allocates radio resources to the terminals according to the priority and the channel quality of each terminal. In particular, when a P2P connection request is performed through a general MAC management message, the scheduler 730 allocates a radio resource for transmitting a PNR request message to a P2P sender terminal.

The P2P controller 732 controls overall functions for supporting P2P communication of terminals. In detail, when a P2P connection request is generated from the P2P sender terminal by the message interpreter 724 or by the codeword detector 728, the P2P controller 732 uses the message generator 726. Notifies UEs in a cell of occurrence of a P2P communication connection request. After notifying the occurrence of the P2P communication connection request, when the reception of the PNR request message is notified from at least one terminal, the P2P controller 732 transmits a P2P communication capable terminal list to the sender terminal through the message generator 726, That is, the P2P list message including the identifier of at least one terminal notifying the reception of the PNR request message is transmitted. Thereafter, when a P2P receiver selection result is received from the sender terminal, the P2P controller 732 transmits parameters for switching the base station mode of the sender terminal through the message generator 726. The parameters are received via a P2P base station message and include the parameters shown in Table 1. Subsequently, the P2P controller 732 performs a handover procedure as a serving base station, thereby handing over the receiver terminal selected by the sender terminal to the sender terminal.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible 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 view showing an example of the arrangement of terminals in a cell in a broadband wireless communication system according to the present invention;

2 is a diagram illustrating a signal exchange for establishing peer-to-peer communication in a broadband wireless communication system according to an embodiment of the present invention;

3 is a diagram illustrating an operation procedure of a P2P sender terminal in a broadband wireless communication system according to an embodiment of the present invention;

4 is a diagram illustrating an operation procedure of a P2P receiver terminal in a broadband wireless communication system according to an embodiment of the present invention;

5 is a diagram illustrating an operation procedure of a base station in a broadband wireless communication system according to an embodiment of the present invention;

6 is a block diagram of a terminal in a broadband wireless communication system according to an embodiment of the present invention;

7 is a block diagram of a base station in a broadband wireless communication system according to an exemplary embodiment of the present invention.

Claims (6)

A method of operating a peer to peer (P2P) sender terminal in a broadband wireless communication system, Transmitting a first message to a base station for notifying a result of selection for a P2P receiver terminal; Receiving a second message including parameters for base station mode switching from the base station; Switching to the base station mode using the parameters; And acting as a base station and performing P2P communication with the P2P receiver terminal. A method for supporting P2P communication of a base station in a broadband wireless communication system, Confirming the selection result of the P2P receiver terminal through a first message for informing the selection result of the P2P receiver terminal of the P2P sender terminal; Transmitting a second message including parameters for switching a base station mode to the P2P sender terminal; Handing the P2P receiver terminal to the P2P sender terminal. A method of operating a P2P receiver terminal in a broadband wireless communication system, Transmitting a second message for notifying reception of a first message for determining whether P2P communication is available from the P2P sender terminal; Performing handover to the P2P sender terminal when handover is instructed from the base station; And performing P2P communication with the P2P sender terminal. A terminal device in a broadband wireless communication system, A transmitter for transmitting a first message to a base station for notifying a result of selection for a P2P receiver terminal; A receiver for receiving from the base station a second message including parameters for base station mode switching; And a controller configured to switch to the base station mode using the parameters and to operate as a base station and perform P2P communication with the P2P receiver terminal. A base station apparatus in a broadband wireless communication system, An interpreter for confirming the selection result of the P2P receiver terminal through a first message for informing the result of selection of the P2P receiver terminal of the P2P sender terminal; A transmitter for transmitting a second message including parameters for base station mode switching to the P2P sender terminal; And a controller for handing over the P2P receiver terminal to the P2P sender terminal. A terminal device in a broadband wireless communication system, A transmitter for transmitting a second message for notifying reception of a first message for determining whether P2P communication is available from a P2P sender terminal; And a controller for performing P2P communication with the P2P sender terminal after performing a handover to the P2P sender terminal when the handover is instructed from the base station.

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