KR20120041144A - Method of transmitting and receiving data in a multi radio access technology system using access point and apparatus thereof - Google Patents

Abstract

PURPOSE: A data transmission and reception method in a multiple wireless connecting system and apparatus are provided to transmit data to a source apparatus by using one or more candidate cooperation terminals. CONSTITUTION: Plural apparatuses receive AP(Access Point) information from a neighboring AP(S1210). A base station respectively transmits a candidate cooperation apparatus role execution request to candidate cooperation apparatuses. The base station respectively receives the AP information from the candidate cooperation apparatuses(S1220). The source apparatus receives the AP information from the neighbor AP(S1230). The base station transmits information for one or more candidate cooperation apparatuses located at the neighbor AP to the source apparatus(S1250).

Description

METHOD OF TRANSMITTING AND RECEIVING DATA IN A MULTI RADIO ACCESS TECHNOLOGY SYSTEM USING ACCESS POINT AND APPARATUS THEREOF}

The present invention relates to wireless communication, and more particularly, to a method and apparatus for transmitting and receiving data between a base station and a terminal in an ACCESS point (AP) based multiple wireless access system.

Recently, data transmission volume of wireless communication networks is increasing rapidly. This is due to the advent and widespread adoption of various devices such as machine-to-machine (M2M) communications and smartphones and tablet PCs that require high data rates. Carrier aggregation (CA) technology, cognitive radio technology, and more, which efficiently use more frequency bands to meet the high data rates required.Multi-antenna technology, multiple to increase data capacity within limited frequencies Base station cooperative transmission technology has recently emerged.

In addition, as the ubiquitous environment arrives, the demand for providing seamless services regardless of time and place using equipment is rapidly increasing.

Accordingly, a wireless communication network is evolving in a direction in which a plurality of terminals communicating through a base station establish a cooperative scheme with each other, and at least one or more terminals cooperate with each other according to a communication environment to transmit or receive data from the base station.

Here, the plurality of terminals may be connected to other terminals in a wireless communication system and help a source device or a source device, which is a subject to communicate with a base station, with the help of other terminals, to communicate with the base station. It includes a cooperative device (Cooperative device) and the cooperative device (Coptical device) that acts as a relay to give a candidate cooperative device other than the source device (Source Device) that does not play a role.

A wireless communication system with high density terminals can exhibit higher system performance by cooperation between terminals. For example, when certain data is to be transmitted to the base station, the source device may transmit the data together with the cooperative device. In addition, the source device may transmit the data through a cooperative device. The above-described example may be equally applicable to the case where the base station transmits data to the terminal, and thus, much better system performance may be achieved. In the following, a wireless communication system including a plurality of terminals in which a cooperative system is established is referred to as a multi radio access technology (RAT) system.

At this time, since a source device has mobility, it is necessary to periodically or aperiodically update information on a plurality of candidate cooperative devices existing in a location close to itself, and thus a solution for this is required.

The present invention relates to wireless communication, and more particularly, to a method and apparatus for transmitting and receiving data between a base station and a terminal in a multiple wireless access system using an access point.

An object of the present invention is to provide a method for communication by a terminal supporting a multi-radio access technology (Multi-RAT) using an access point.

Another technical problem to be achieved in the present invention is to provide a method for a candidate cooperating terminal to support communication using a multi-radio access technology (Multi-RAT) using an access point.

Another technical problem to be achieved in the present invention is to provide a method for communication by a base station supporting a multi-radio access technology (Multi-RAT) using an access point.

Another technical problem to be achieved in the present invention is to provide a terminal supporting a multi-radio access technology (Multi-RAT) using an access point.

Another technical problem to be achieved in the present invention is to provide a candidate cooperative terminal that supports a multi-radio access technology (Multi-RAT) using an access point.

Another technical problem to be achieved in the present invention is to provide a base station supporting a multi-radio access technology (Multi-RAT) using an access point.

Technical problems to be achieved in the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

In a method for performing communication by an access point (ACCESS POINT, AP) based terminal supporting multiple radio access technologies (Multi-RAT) which is an aspect of the present invention for achieving the above technical problem. Receiving, from the first AP, information about a first AP associated with the terminal among a plurality of APs; transmitting information about the first AP to a base station; at least one candidate cooperation associated with the first AP. Receiving information about a terminal from the base station and transmitting first data to the base station using the at least one candidate cooperative terminal, wherein the first data is the at least one candidate cooperation with the terminal. Terminals communicate with each other through a first radio access scheme, and a second radio access scheme between the at least one candidate cooperative terminal and the base station is established. It can be communicated.

The terminal may further include directly transmitting second data to the base station through the second wireless access scheme.

The first wireless access method may be a WiFi Fidelity (WiFi) access method, and the second wireless access method may be a WiMAX (Worldwide Interoperability for Microwave Access) access method.

The information on the first AP may include at least one of medium access control (MAC) address information and service set identifier (SSID) information.

In addition, the information on the first AP may be periodically received from the first AP.

The method may further include transmitting, by the terminal, a probe request message to the first AP, wherein the information about the first AP is a probe response message in response to the transmitted probe request message. response message).

The terminal may further include periodically monitoring whether information on the at least one candidate cooperative terminal has been received.

Meanwhile, a candidate cooperative terminal based on an access point (AP) supporting multi-radio access technology (Multi-RAT), which is an aspect of the present invention, to achieve another technical problem, may perform communication. In the performing method, Receiving information on the first AP associated with the candidate cooperating terminal of a plurality of AP from the first AP, Transmitting information about the first AP to the base station, The first AP Receiving first data from a terminal associated with and transmitting the received first data to the base station, wherein the first data is communicated between the terminal and the candidate cooperating terminal through a first wireless access scheme; The candidate cooperative terminal and the base station may be communicated through a second wireless access scheme.

The first wireless access method may be a WiFi Fidelity (WiFi) access method, and the second wireless access method may be a WiMAX (Worldwide Interoperability for Microwave Access) access method.

The method may further include receiving an activation request message for cooperating with the client from the base station, and transmits information on the first AP to the base station in response to the activation request message.

The information on the first AP may include at least one of medium access control (MAC) address information and service set identifier (SSID) information.

In addition, the information on the first AP may be periodically received from the first AP.

The method may further include transmitting, by the terminal, a probe request message to the first AP, wherein the information about the first AP is a probe response message in response to the transmitted probe request message. response message).

On the other hand, an access point (ACCESS POINT, AP) based base station that supports the multi-radio access technology (Multi-RAT (Radio Access Technology)), which is an aspect of the present invention for achieving the above another technical problem to perform communication A method comprising: receiving information about an AP associated with each of the plurality of candidate cooperative terminals among a plurality of APs from a plurality of candidate cooperative terminals, and receiving information about a first AP associated with the terminal of the plurality of APs from a terminal; And receiving information on at least one candidate cooperative terminal associated with the first AP among the APs associated with each of the plurality of candidate cooperative terminals, wherein the base station is configured to perform the at least one candidate cooperative operation. Communicating first data with the terminal by using a terminal, wherein the first data is between the terminal and the at least one candidate cooperative terminal; A first and a communication on a radio access scheme, between the at least one candidate cooperating terminal and the base station may be communicated through the second wireless access scheme.

The method may further include directly receiving second data from the terminal through the second wireless access scheme.

The first wireless access method may be a WiFi Fidelity (WiFi) access method, and the second wireless access method may be a WiMAX (Worldwide Interoperability for Microwave Access) access method.

The at least one candidate cooperative terminal may include at least one of information on whether the client cooperative operation can support a client cooperative operation, movement speed information, location information, power reserve information, channel state information, presence and number of neighboring candidate cooperative terminals, and information. It can be determined by the base station using one.

Meanwhile, in an access point (ACCESS POINT, AP) based terminal supporting multiple radio access technology (Multi-RAT), which is an aspect of the present invention for achieving the above technical problem, a plurality of Receiving module for receiving information on the first AP associated with the terminal of the AP from the first AP, and receiving information about at least one candidate cooperative terminal associated with the first AP from the base station, for the first AP A transmission module for transmitting information to a base station and transmitting first data to the base station using the at least one candidate cooperative terminal, and a first wireless access scheme between the terminal and the at least one candidate cooperative terminal; Communication through the second wireless access scheme between the at least one candidate cooperating terminal and the base station; It may include a processor.

In the candidate cooperative terminal based on an access point (ACCESS POINT, AP) that supports multiple radio access technology (Multi-RAT), which is an aspect of the present invention for achieving the above another technical problem, A receiving module for receiving information about a first AP associated with the candidate cooperative terminal among a plurality of APs from the first AP, and receiving first data from a terminal associated with the first AP, and information about the first AP. A transmission module for transmitting to the base station and transmitting the received first data to the base station and the first data are communicated between the terminal and the candidate cooperating terminal through a first wireless access scheme, and the candidate cooperating terminal and the base station The mobile station may include a processor for controlling the communication to be communicated through a second wireless access method.

Meanwhile, in an access point (ACCESS POINT, AP) based base station supporting multiple radio access technology (Multi-RAT), which is an aspect of the present invention for achieving the above another technical problem, a plurality of A receiving module for receiving information on an AP associated with each of the plurality of candidate cooperative terminals among a plurality of APs from a candidate cooperative terminal, and receiving information about a first AP associated with the terminal among the plurality of APs from a terminal, the plurality of APs; A transmission module for transmitting information about at least one candidate cooperative terminal associated with the first AP among APs associated with each candidate cooperative terminal of the base station, and the base station by using the at least one candidate cooperative terminal. Communicate one data, and wherein the first data is communicated between the terminal and the at least one candidate Seen is, between the at least one candidate cooperating terminal and the base station may include a processor for controlling such that communications over the second wireless connection mode.

In a multi-RAT system, a base station can effectively transmit data to a source device according to the present invention. In addition, in a multi-RAT system, a source device may effectively transmit data to a base station through a cooperative device according to the present invention.

The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned above may be clearly understood by those skilled in the art from the following description. will be.

1 illustrates an example of a multiple radio access system.
2 illustrates an example of multiple radio access system operations.
3 is a diagram illustrating a specific example of a basic service set (BSS) according to whether an access point (AP) is used.
FIG. 4 is a diagram illustrating an example in which a base station and a terminal transmit and receive data in an access point (AP) based multiple wireless access system.
5 is a diagram illustrating a structure of a frequency division duplex (FDD) radio frame in 3GPP LTE.
FIG. 6 is a diagram illustrating a time division duplex (TDD) radio frame structure in 3GPP LTE. FIG.
FIG. 7 illustrates an example of a resource grid for one downlink slot. FIG.
8 illustrates an example of a downlink subframe structure.
9 illustrates a structure of an uplink subframe used in an LTE system.
FIG. 10 is a diagram for explaining a mapping relationship between codewords, layers, and antennas for transmitting downlink signals in a multi-antenna wireless communication system. FIG.
FIG. 11 illustrates an example of an information exchange step required for transmitting and receiving data between a base station and a plurality of devices in a multiple radio access system in accordance with the present invention. FIG.
FIG. 12 illustrates an example of a step in which a base station determines a cooperative device for client cooperation by using access point (AP) information in accordance with the present invention. FIG.
13A-13D illustrate an example of a notification signal transmission frame in a passive scan type in connection with the present invention.
14A and 14B illustrate an example of a notification signal request transmission frame in an active scan type in connection with the present invention.
15A-15C illustrate an example of a notification signal response transmission frame in an active scan type in connection with the present invention.
16 is a view showing an example of a block diagram of a base station and a terminal in accordance with the present invention.

The following technologies include code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier-frequency division multiple access (SC-FDMA), and the like. The same can be used for various multiple access schemes. CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA may be implemented in a wireless technology such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Evolved UTRA (E-UTRA). UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is a part of Evolved UMTS (E-UMTS) using E-UTRA, and employs OFDMA in downlink and SC-FDMA in uplink. LTE-A (Advanced) is the evolution of LTE. IEEE 802.16m is an evolution of IEEE 802.16e.

The term 'multi-RAT' used herein may be referred to as various terms such as a wireless communication scheme.

1 is a diagram illustrating an example of a multiple radio access system.

Referring to FIG. 1, a multi-radio access system includes a base station 100 and a plurality of communication devices 110, 120, 130, and 140.

In FIG. 1, the devices 110, 120, 130, and 140 denoted as communication devices are connected to other communication devices and source devices and source devices, which are subjects to communicate with a base station with the help of other communication devices. The source device may be a candidate cooperative device other than a cooperative device serving as a relay that helps the base station communicate with the base station or a source device not serving as a cooperative device. have.

In a multiple radio access system, the plurality of communication devices 110, 120, 130, 140 may establish a cooperative scheme with each other. In a multi-radio access system in which a cooperative system is established, a source device may transmit data to a base station along with a cooperative device. Furthermore, the source device may receive data from the base station together with the cooperative device.

Here, the direct wireless communication method between the plurality of devices may be different from the direct wireless communication method between the base station and the plurality of devices. That is, a wireless LAN connection method (for example, Wi-Fi, etc.) is applied between a plurality of devices, and data is transmitted and received, and a mobile communication network connection method (for example, IEEE 802.16 (WiMAX)) is performed between a base station and a plurality of devices. Etc.) may be applied to transmit and receive data.

For example, the plurality of devices may directly communicate with each other according to IEEE 802.11 (Wi-Fi) technology or Bluetooth technology. On the other hand, each of the plurality of devices may be in direct communication with each other using a base station and IEEE 802.16 (WiMAX) technology.

However, the present invention is not limited thereto, and a base station and a plurality of devices may communicate with each other according to the same wireless communication scheme.

Referring to FIG. 1, in a multi-radio access system in which a cooperative scheme is established, the source device 140 may transmit data to the base station 100 together with the cooperative device 130. This allows the communication device to efficiently transmit data, thereby ensuring excellent performance. In addition, the multiple wireless access system with the cooperative scheme can enhance the throughput of each device, and the effect of reducing the power consumption through data communication through the cooperative scheme is also guaranteed.

In addition, in a multi-radio access system in which a cooperative scheme is established, a source device may transmit data to a base station through a cooperative device. Furthermore, the source device may receive data from the base station through a cooperative device.

Referring to FIG. 1, in a multi-radio access system in which a cooperative scheme is established, the source device 110 may transmit data to the base station 100 through the cooperative device 120. Through this, the communication device can efficiently transmit data, thereby preventing deterioration of system performance.

In FIG. 1, an example in which a source device transmits data to a base station through a cooperative device has been described. However, the above description may also be applied when the base station receives data from a source device.

In addition, when transmitting other data, the source devices 110 and 140 in FIG. 1 may be cooperative devices or neighbor devices that do not participate in the transmission of data, and the cooperative devices 120 and 130 may also be source devices or data. It may be a neighboring device that does not participate in the transmission of.

2 is a diagram illustrating an example of an operation of a multiple radio access system.

Referring to FIG. 2, a multiple radio access system includes a base station 210 and a plurality of communication devices 220 and 230.

In the multiple wireless access system, the plurality of communication devices 220 and 230 may establish a cooperative scheme with each other through a wireless technology such as 802.11 (Wi-Fi).

In general, each of the plurality of communication devices 220 and 230 may directly transmit or receive data through a base station 210 and a wireless technology such as IEEE 802.16 (WiMAX).

In this case, when the current communication quality of the source device 220 is sharply reduced, the source device 220 may transmit data indirectly to the base station 210 through the cooperative device 230. In addition, the source device 220 may receive data from the base station 210 indirectly through the cooperative device 230.

Therefore, in a multi-radio access system, a communication device not only can communicate data directly with a base station, but also can communicate data indirectly with the help of a cooperative device having excellent communication quality. Deterioration can be prevented and efficient data communication can be performed.

In order to transmit and receive data in cooperation with a plurality of communication devices in a multiple wireless access system, a preliminary procedure of exchanging information is required.

The information exchange step to be performed between the base station and the plurality of communication devices in the multiple radio access system may be largely composed of four steps. That is, the method may include a general network entry step, a negotiation step for cooperating a plurality of devices, a neighbor device of a source device, selection of a cooperative device among the discovered neighbor devices, and a connection with the selected cooperative device. .

Meanwhile, in a multi-radio access system, a plurality of communication devices cooperate to communicate with each other by using an infrastructure basic service set (Infrastructure BBS) and independent basic services depending on whether an access point (AP) is used. It can be divided into a set (Independent Basic Service Set (BBS)).

An access point (AP) refers to a connection point between a base station and a plurality of terminals in a multi-radio access system, and may be referred to as an interconnection point. For example, an access point (AP) is a wired LAN and a wireless LAN. Is the middleman connecting.

The access point may be referred to as an access point, an access point, an AP, etc., but for convenience of description, the access point will be referred to as an access point.

In the case of using an access point (AP) in a multi-radio access system, a point-to-point function for connecting terminals located at two points to each other and communicating with each other may be provided.

In addition, unlike a point-to-point function, a point-to-multipoint function may be provided that allows a plurality of connected terminals to communicate with each other by connecting a plurality of terminals at the same time.

 In addition, by wirelessly connecting to the base station and another access point (AP), it is possible to provide a repeater (Repeater) function to extend the data communication to the wireless area. That is, an access point (AP) set as a repeater may communicate with another access point (AP) while providing a connection with a base station.

Further, connected to the plurality of terminals to send and receive signals in a wired or proximity communication network, it may be provided with a wireless client (Wireless Client) ability to to send and receive signals over the air.

FIG. 3 is a diagram illustrating a specific example of a basic service set (BSS) according to whether an access point (AP) is used.

3A illustrates an example of an infrastructure basic service set (Infrastructure BBS).

In an infrastructure basic service set (Infrastructure BBS), a plurality of terminals communicate using an access point (AP).

The multi-radio access system may include a plurality of access points (APs), and a plurality of terminals may exist around each of the plurality of access points.

3B illustrates an example of an independent basic service set (Independent BBS).

In an independent basic service set (Independent BBS), a plurality of terminals are directly connected to each other.

The above description includes all cases where a plurality of terminals are located within the coverage of each of the plurality of access points, are wirelessly connected, or are detected within the coverage. That is, when a terminal and an access point are associated with each other, an infrastructure basic service set (BBS) may be implemented.

However, for convenience of description, it is assumed that each terminal is connected to each access point to configure an infrastructure basic service set (Infrastructure BBS).

Hereinafter, an operation for client cooperation under an infrastructure basic service set (BBS) structure will be described in more detail with reference to FIG. 4.

FIG. 4 is a diagram illustrating an example in which a base station and a terminal transmit and receive data in a multi-radio access system to which the aforementioned access point (AP) is applied.

Referring to FIG. 4, a first access point 150 and a second access point 160 are included in a multiple wireless access system.

In addition, a first terminal 110 and a second terminal 120 exist near the first access point 150, and the first terminal 110 and the second terminal 120 cooperate with the base station 100 and the client. It can perform a data communication operation for (Client Cooperation).

In addition, a third terminal 130 and a fourth terminal 140 exist near the second access point 160, and the third terminal 130 and the fourth terminal 140 cooperate with the base station 100 and the client. It can perform a data communication operation for (Client Cooperation).

Next, a structure of a radio frame that can be applied to the present invention will be described.

For convenience of description, a structure of a radio frame applied in 3GPP LTE will be described as an example, but the content of the present invention is not limited thereto, and various types of radio frames may be applied.

5 shows a structure of a frequency division duplex (FDD) radio frame in 3GPP LTE. This radio frame structure is referred to as frame structure type 1.

Referring to FIG. 5, a radio frame consists of 10 subframes, and one subframe is defined by two consecutive slots. The time taken for one subframe to be transmitted is called a transmission time interval (TTI). The length of time of the radio frame is T _f = 307 200 * T _s = 10 ms and consists of 20 slots. The length of time of the _slot T _slot = 15360 * T _s = 0.5ms, numbered from 0 to 19. Downlink, where each node or base station transmits a signal to a terminal, and uplink, which a terminal transmits a signal to each node or base station, are distinguished in a frequency domain.

FIG. 6 shows a time division duplex (TDD) radio frame structure in 3GPP LTE. This radio frame structure is referred to as frame structure type 2.

Referring to FIG. 6, one radio frame is composed of two half-frames having a length of 10 ms and a length of 5 ms. One half frame also consists of five subframes having a length of 1 ms. One subframe is designated as one of an uplink subframe (UL subframe), a downlink subframe (DL subframe), and a special subframe. One radio frame includes at least one uplink subframe and at least one downlink subframe. One subframe is defined by two consecutive slots. For example, one subframe may have a length of 1 ms, and one slot may have a length of 0.5 ms.

The special subframe is a specific period for separating the uplink and the downlink between the uplink subframe and the downlink subframe. At least one special subframe exists in one radio frame, and the special subframe includes a downlink pilot time slot (DwPTS), a guard period, and an uplink pilot time slot (UpPTS). DwPTS is used for initial cell search, synchronization or channel estimation. UpPTS is used for channel estimation at the base station and synchronization of uplink transmission of the terminal. The guard period is a period for removing interference generated in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.

One slot in the FDD and TDD radio frames includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain and includes a plurality of resource blocks (RBs) in the frequency domain. The OFDM symbol is used to represent one symbol period since 3GPP LTE uses OFDMA in downlink, and may be called another term such as an SC-FDMA symbol according to a multiple access scheme. The RB includes a plurality of consecutive subcarriers in one slot in resource allocation units.

The structure of the radio frame described with reference to FIGS. 5 and 6 is 3GPP TS 36.211 V8.3.0 (2008-05) "Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation (Release) 8) "and sections 4.1 and 4.2.

The structure of the above-described radio frame is merely an example, and the number of subframes included in the radio frame or the number of slots included in the subframe and the number of OFDM symbols included in the slot may be variously changed.

7 is an exemplary diagram illustrating a resource grid for one downlink slot.

Referring to FIG. 7, one downlink slot includes a plurality of OFDM symbols in a time domain. Here, one downlink slot includes 7 OFDMA symbols, and one resource block (RB) is exemplarily described as including 12 subcarriers in a frequency domain, but is not limited thereto.

Each element on the resource grid is called a resource element, and one resource block RB includes 12 × 7 resource elements. The number N ^DL of resource blocks included in the downlink slot depends on the downlink transmission bandwidth set in the cell. The resource grid for the downlink slot described above may also be applied to the uplink slot.

8 shows an example of a downlink subframe structure.

Referring to FIG. 8, a subframe includes two consecutive slots. Up to three OFDM symbols of the first slot in the subframe may be a control region to which downlink control channels are allocated, and the remaining OFDM symbols may be a data region to which a Physical Downlink Shared Channel (PDSCH) is allocated.

The downlink control channel includes a PCFICH (Physical Control Format Indicator Channel), a PDCCH (Physical Downlink Control Channel), PHICH (Physical Hybrid-ARQ Indicator Channel). The PCFICH transmitted in the first OFDM symbol of the subframe carries information about the number of OFDM symbols (that is, the size of the control region) used for transmission of control channels in the subframe. Control information transmitted through the PDCCH is called downlink control information (DCI). DCI indicates uplink resource allocation information, downlink resource allocation information, and uplink transmit power control command for certain UE groups. The PHICH carries an ACK (Acknowledgement) / NACK (Not-Acknowledgement) signal for a hybrid automatic repeat request (HARQ) of uplink data. That is, the ACK / NACK signal for the uplink data transmitted by the UE is transmitted on the PHICH.

PDSCH is a channel through which control information and / or data is transmitted. The UE may read down the data transmitted through the PDSCH by decoding the downlink control information transmitted through the PDCCH.

9 is a diagram illustrating a structure of an uplink subframe used in an LTE system.

Referring to FIG. 9, a subframe 700 having a length of 1 ms, which is a basic unit of LTE uplink transmission, is composed of two 0.5 ms slots 701. Assuming the length of a normal cyclic prefix (CP), each slot is composed of seven symbols 702 and one symbol corresponds to one SC-FDMA symbol. The resource block 703 is a resource allocation unit corresponding to 12 subcarriers in the frequency domain and one slot in the time domain. The structure of the uplink subframe of LTE is largely divided into a data region 704 and a control region 705. Here, the data area means a series of communication resources used in transmitting data such as voice and packet transmitted to each terminal, and corresponds to the remaining resources except for the control area in the subframe. The control region means a series of communication resources used for transmitting downlink channel quality reports from each terminal, reception ACK / NACK for downlink signals, and uplink scheduling requests.

As shown in the example shown in FIG. 9, an area 706 in which a sounding reference signal can be transmitted in one subframe is an interval in which one SC-FDMA symbol is located last on the time axis in one subframe. It is transmitted through the data transmission band. Sounding reference signals of various terminals transmitted in the last SC-FDMA of the same subframe can be distinguished from cyclic shift values. In addition, an area in which a DM (Demodulation) -Reference Signal is transmitted in one subframe is a section including a center SC-FDMA symbol, that is, a fourth SC-FDMA symbol and an eleventh SC-FDMA symbol in one slot. It is transmitted through the data transmission band on the frequency.

FIG. 10 illustrates a mapping relationship between codewords, layers, and antennas for transmitting downlink signals in a multi-antenna wireless communication system.

Referring to FIG. 10, there is a complex mapping relationship between data information and transmitted symbols. First, as the data information, the MAC layer transmits N _C transport blocks to the physical layer, and the transport blocks in the physical layer are converted into codewords through a channel coding process, and are puncturing or repetition. The same rate matching as the procedure is performed. The channel coding is performed here in a channel coder such as a turbo encoder or tail bit convolutional encoder.

와 같이 표현할 수 있다. H는 채널 행렬을 의미한다.After channel coding and rate matching, N _C codewords are mapped to N _L layers. In this case, the layers refer to different pieces of information sent by using a multi-antenna technology, and the number of layers cannot be greater than the rank, which is the maximum number of different pieces of information. This is a formula

It can be expressed as H means a channel matrix.

For reference, unlike Orthogonal Frequency Division Multiple Access (OFDMA) transmission, which is a general downlink transmission method, an uplink signal transmitted in Single Carrier-Frequency Division Multiple Access (SC-FDMA) method is processed with Inverse Fast Fourier Transform (IFFT). In order to partially offset the influence so that the transmission signal has a single carrier characteristic, a DFT process is performed for each layer.

In each layer, the DFT-converted signal is multiplied by a precoding matrix and mapped to N _T transmit antennas, and then transmitted to the base station through an IFFT process.

In general, a common reference signal and a UE specific reference signal exist in the downlink reference signal, and precoding is not applied to the common reference signal. That is, on the other hand, the terminal specific reference signal is inserted at the front end of the precoding, precoded and transmitted to the terminal side in the same manner as general data.

There are some constraints for implementing channel-independent spatial multiplexing transmission using UE specific reference signals, that is, dedicated reference signals. First, in order to reduce the signaling overhead of the reference signal, the transmission reference signal should be precoded using the same precoding matrix as the modulated data symbol. In addition, to obtain spatial channel diversity, the precoding matrix must be switched between antennas. However, since the dedicated reference signal is transmitted in a specific rule or arbitrarily over the entire transmission resource region, it is not easy to satisfy the constraint. This is because the channel measurement is performed in units of a certain number of resource elements for the efficiency of channel measurement. Thus, the precoding matrix for precoding a dedicated reference signal cannot be changed in units of resource elements.

On the other hand, in a multiple wireless access system, a plurality of communication devices cooperate in advance and require a preliminary procedure of exchanging information in advance.

At each step of the information exchange pre procedure each communication device may be in three states. That is, it may be placed in a first state not connected to each other, a second state in which the other communication device is recognized and authenticated, and a third state in combination with the other communication device.

This will be described in detail with reference to Table 1.

certification( Authentication ) Combination( Association ) State 1 X X State 2 O X State 3 O O

First, the first state means a state in which a plurality of communication devices are not connected at all in the multiple radio access system. Therefore, in the first state, each source device must communicate data directly with the base station.

Next, the second state means a state of acquiring information of the counterpart communication device and authenticating the counterpart communication device.

An example of a method of acquiring information of the counterpart communication device is a passive method of receiving information of the counterpart communication device through a beacon message or a probe request message is transmitted and received in response to the transmitted probe request message. An active method for receiving information of the counterpart communication device through the probe response message may be used.

Each communication device acquires the information of the other communication device using the above-described method, and then exchanges an authentication frame with the other communication device (for example, an authentication request and an authentication response) to perform an authentication check operation. To complete.

Each communication device enters a second state when the authentication check operation is completed.

Finally, the third state means a state combined with an authenticated counterpart communication device.

That is, each communication device exchanges an association frame with a counterpart communication device (eg, an association request and an association response) to complete an association operation (eg, AID assignment, etc.). When the combining operation of the plurality of communication devices in the wireless access system is completed, these communication devices may transmit and receive data with each other.

In the above, the state of the communication devices in each step of the information exchange preliminary procedure has been described. Hereinafter, to facilitate the understanding of the present invention, each step of the information exchange pre procedure in the radio access system including the base station will be described in detail.

Basically, in the multi-radio access system, the information exchange step to be performed between the base station and the plurality of communication devices can be largely composed of four steps. That is, the method may include a general network entry step, a negotiation step for cooperating a plurality of devices, a neighbor device of a source device, selection of a cooperative device among the discovered neighbor devices, and a connection with the selected cooperative device. .

Hereinafter, for convenience of description, it is assumed that each step subject of the information exchange pre- procedure is a source device. However, the content of the present invention is not limited thereto, and the content of the present invention may be applied to devices, cooperative devices, candidate cooperative devices, and the like, which support multiple radio access systems in each step.

11 is a view showing an example of information exchange step required for transmitting and receiving data between a base station and a plurality of devices in a multiple radio access system in accordance with the present invention.

First, the source device goes through the base station and the general network entry step (S1000). That is, through the general network entry step (S1000), the source device may be connected to the base station to directly transmit and receive data. For convenience of description, the general network entry step S1000 is hereinafter referred to as first step.

Next, the source device, which has undergone the first step with the base station, goes through a negotiation step (S2000) for cooperating a plurality of devices in the multiple radio access system. In the negotiation step S2000, the source device negotiates with the base station about the capability for cooperative operation.

In this case, the information that can be transmitted and received between the base station and the source device may include connection RAT type information, system type information, system version information, location information, information on whether the role of the cooperative device can perform.

For convenience of explanation, the negotiation step S2000 is referred to as a second step hereinafter.

Next, the base station, the source device, and the plurality of candidate cooperative devices, which have passed through the second step, search for neighboring devices and select a cooperative device among the discovered neighboring devices (S3000). For convenience of explanation, the step of searching for a neighboring device and selecting a cooperative device among the found neighboring devices (S3000) is hereinafter referred to as a third step.

In the third step, the base station, the source device and the plurality of candidate cooperative devices exchange location information with each other, and select a cooperative device to participate in data communication in the multiple radio access system based on this.

The source device having passed through the third step is connected to the selected cooperative device (S4000). When the step (S4000) of connecting with the selected cooperative device is completed, the connected source device and the cooperative device may cooperate with each other to transmit and receive data with the base station.

Hereinafter, for convenience of description, the step S4000 of connecting with the selected cooperative device will be referred to as a fourth step.

In this case, each step of the information exchange pre procedure may not be applied to all communication devices in common.

That is, the first step and the second step should be performed in common by a plurality of communication devices supporting the multiple radio access system. However, the third and fourth steps may be performed by at least one of the source device, the cooperative device, or the candidate cooperative device, and not all communication devices need to perform the third and fourth steps.

However, some processes of the third step (for example, obtaining location information of each of the plurality of communication devices supporting the multi-radio access system) may need to be performed by all communication devices in common.

Therefore, all communication devices supporting the multi-radio access system must go through the first step and the second step, so that the communication devices that have passed the first step and the second step are not distinguished from each other. After the third step, the device is treated as a preliminary source device and a preliminary cooperative device. After the fourth step is completed, the source device and the cooperative device may be determined to cooperate with each other to transmit and receive data with the base station.

Hereinafter, for convenience of description, a method of cooperating with a plurality of communication devices in a multi-radio access system is an infrastructure basic service set (Infrastructure BBS) that communicates using an access point (AP). Assume that

The source device searches for a plurality of candidate cooperative devices capable of performing client cooperation in order to perform efficient data communication with the base station, and selects at least one cooperative device among the searched plurality of candidate cooperative devices to cooperate with the client. (Client Cooperation) Perform the operation.

In this case, since the source device has mobility, it is necessary to periodically or aperiodically update information on a plurality of candidate cooperative devices existing in a location close to the source device. This is because when the location of the source device is changed, a plurality of candidate cooperation devices capable of performing client cooperation with the source device may be changed together.

In order to solve the above problems, the present invention, the base station receives the access point (AP) information received from the access point (AP) of the plurality of devices from the plurality of devices, the access point (AP) information received By using to determine a cooperative device to perform a client cooperation (Client Cooperation) of a plurality of candidate cooperative devices, and provides a method for transmitting the information about the determined cooperative device to the source device.

In particular, the method provided by the present invention can be usefully applied to a situation in which the source device cannot be connected to the searched access point (AP) (for example, a service provider to which the source device cannot connect). .

This will be described in detail with reference to FIG. 12.

12 illustrates an example of a step of a base station determining a cooperative device for client cooperation by using access point (AP) information in accordance with the present invention.

Hereinafter, for convenience of description, a client cooperation operation or an enhanced tethering operation in a multiple radio access system is referred to as a CC operation.

First, a plurality of devices in a multi-radio access system receives access point (AP) information from an access point (AP) located in the vicinity of the plurality of access points (AP) (S1210).

Thereafter, the base station 100 determines a plurality of candidate cooperative devices capable of performing a CC operation with a source device among a plurality of devices in the multiple radio access system, and serves as candidate candidate devices with each of the determined plurality of candidate cooperative devices. A request for execution is transmitted, and access point (AP) information is received from each of the plurality of candidate cooperative devices 110 that have approved this (S1220).

In addition, the source device 120 having mobility also receives access point (AP) information from the neighboring access point (AP) at the current position among the plurality of access points (AP) (S1230).

The source device 120 receiving the access point (AP) information from the access point (AP) located near the current location transmits the access point (AP) information received to the base station 100 (S1240).

Thereafter, the base station 100 compares the access point (AP) information received from each of the candidate cooperative devices 110 with the access point (AP) information received from the source device 120 to determine whether there is the same access point (AP). Determine whether or not.

In addition, the base station 100 transmits, to the source device, information about at least one candidate cooperative device located near the same access point (AP) as the source device among the plurality of candidate cooperative devices (S1250).

The source device 120 receiving the information acquires information on a plurality of candidate cooperative devices existing in a location close to the source device 120. Through this process, the source device updates the list of the plurality of candidate cooperative devices periodically or aperiodically.

Therefore, a mobile source device can periodically or aperiodically update information on a plurality of candidate cooperative devices that are located close to itself, and can smoothly perform a client cooperation operation using them. .

Hereinafter, a method of determining by a plurality of candidate cooperative devices capable of performing a CC operation by a base station with reference to the drawings, a method by which a plurality of candidate cooperative devices receive access point (AP) information from an access point (AP), A method for determining suitable cooperative devices to perform CC operation with a source device among a plurality of candidate cooperative devices, and a method in which a source device monitors information about a (candidate) cooperative device using an access point (AP). It demonstrates concretely.

First, a method of determining by a plurality of candidate cooperative devices in which a base station can perform a CC operation will be described.

A plurality of candidate cooperative devices capable of performing the CC operation may be determined by the base station.

The base station may include information on whether CC can support CC operation in a multiple radio access system (eg, support information), movement speed information (eg, floating, moving at low speed), location information, Determine whether the device can perform CC operation in consideration of the presence and number of candidate cooperative devices in the vicinity, power reserve information, channel state information (for example, high quality state), and the like. do.

At this time, the base station may request transmission of the remaining information from the corresponding device only when some information among the plurality of listed information satisfies the condition for performing the CC operation.

For example, only when the channel state of the corresponding device supporting CC operation in a multi-radio access system is good, the base station can determine the remaining information such as moving speed information, location information, existence and number of neighboring candidate cooperative devices, and power. The corresponding device may request to transmit the reserve information.

In this case, when the base station satisfies the condition for performing the CC operation and determines that the CC operation is necessary, the base station requests the corresponding device to perform a role as a candidate cooperative device.

The corresponding device that receives the request to perform a role as a candidate cooperative device from the base station may approve or reject it.

If the device approves the request to perform the role of a candidate cooperative device received from the base station, the device may provide specific information (eg, IEEE 802.11a, IEEE 802.11b, IEEE 802.11g, IEEE 802.11) to perform the CC operation. n information about the system type, system version, MAC address, WiFi, or Bluetooth in the wireless technology) is transmitted to the base station.

In this case, the device transmits the information on the access point (AP) received from the access point (AP) located in the vicinity to the base station.

The access point (AP) information may include a MAC address and a service set identifier (SSID) of the access point (AP). However, this is merely exemplary and other information required for the base station to distinguish each of the plurality of access points may also be included in the access point information.

Subsequently, when specific information necessary for performing the CC operation is transmitted to the base station, the corresponding device may serve as a candidate cooperative device.

In addition, a method of receiving the access point (AP) information from a plurality of candidate cooperating devices from the access point (AP) will be described in detail.

The plurality of access points may transmit respective access point information according to a passive scan type or an active scan type.

In the case of a passive scan type, each of the plurality of access points periodically transmits access point information to the periphery.

In this case, the transmitted AP information may be a notification signal such as a beacon to which the conventional IEEE 802.11 wireless technology is applied.

Next, when following an active scan type, each of the plurality of devices transmits an access point (AP) information request message to an unspecified or specific access point (AP), and the plurality of access points (AP). Each of them transmits an access point (AP) information response message including access point (AP) information to a plurality of devices in response to the access point (AP) information request message.

For example, the transmitted access point (AP) information request message and the access point (AP) information response message may be a probe request message and a probe response message when the conventional IEEE 802.11 wireless technology is applied. message).

The access point (AP) information received by the plurality of candidate cooperative devices may include a service set identifier (SSID) and a MAC address of the access point (AP).

In addition, each of the plurality of candidate cooperative devices may perform an operation according to a passive scan type or an active scan type periodically to receive access point (AP) information.

For example, an operation of periodically receiving a notification signal such as a beacon or the like or transmitting a probe request message may be periodically performed.

When a plurality of candidate cooperating devices approve a request to perform a role as a candidate cooperating device received from a base station, the devices may provide specific information necessary for performing CC operation (eg, IEEE 802.11a, IEEE 802.11b, IEEE 802.11g). And access point (AP) information received together with a system type, system version, information on a MAC address, WiFi, or Bluetooth in IEEE 802.11n wireless technology, to the base station.

Referring to the drawings, a description will be given of specific contents in which the AP information is transmitted from the AP by treating the passive scan type or the active scan type differently.

13A to 13D illustrate an example of a notification signal transmission frame in a manual scan type according to the present invention.

According to the passive scan type, each of the plurality of access points (APs) periodically transmits access point (AP) information to the surroundings, and the transmitted access point (AP) information is transmitted by conventional IEEE 802.11 wireless technology. It may be a beacon notification signal applied.

13A to 13D show details of a frame body of a beacon notification signal.

However, each of FIGS. 13A to 13D is not a separate frame body, but all are combined to form one frame body, and are shown in FIG. 13A to FIG. 13D for convenience.

In this case, as shown in FIG. 13A, the frame body of the beacon notification signal may include a Service Set Identifier (SSID) field of the access point AP.

In addition, the MAC header may include a MAC address of the access point (AP).

Next, FIGS. 14A and 14B are diagrams illustrating an example of a notification signal request transmission frame in an active scan type according to the present invention.

In the case of an active scan type, each of the plurality of devices transmits an access point (AP) information request message to each access point, and the transmitted access point information request message is transmitted. It may be a probe request message according to the conventional IEEE 802.11 wireless technology.

14A and 14B show details of a frame body of a probe request message according to the conventional IEEE 802.11 wireless technology.

However, each of FIGS. 14A and 14B is not a separate frame body, but combines together to form one frame body, and is divided into FIGS. 14A and 13B for convenience.

15A to 15C are diagrams illustrating an example of a notification signal response transmission frame in which a corresponding access point AP corresponds to the probe request message.

When the active scan type and the conventional IEEE 802.11 wireless technology are applied, the access point (AP) may transmit a probe response message including access point (AP) information to a plurality of devices. have.

15A to 15C show details of a frame body of a probe response message.

However, each of FIGS. 15A to 15C is not a separate frame body, but all are combined to form one frame body, and are divided into FIGS. 15A to 15C for convenience.

In this case, as shown in FIG. 15A, the frame body of the probe response message may include a Service Set Identifier (SSID) field of the access point AP. In addition, the MAC header may include a MAC address of the access point (AP).

Thereafter, the base station compares the access point (AP) information received from each of the candidate cooperative devices and the access point (AP) information received from the source device to determine whether there is the same access point (AP).

The base station transmits information on at least one candidate cooperative device located near the same access point (AP) as the source device among the plurality of candidate cooperative devices to the source device.

At this time, the base station uses the service set indicator (SSID) information of the access point (AP) received from each device and the MAC address of the access point (AP) access to the same source device and each candidate cooperative device It may be determined whether or not it is located within the point AP.

Thereafter, the source device can receive information about candidate cooperative devices transmitted by the base station.

Hereinafter, for the convenience of description, information about candidate cooperative devices transmitted by a base station is referred to as candidate cooperative device information.

The source device may periodically perform an operation of monitoring candidate cooperative device information to maintain a list of information on the latest candidate cooperative device.

The candidate cooperative device information includes the MAC address and location information of the candidate cooperative device.

The source device updates the candidate cooperative device list for performing CC operation using the received candidate cooperative device information.

In addition, the source device may periodically report the updated candidate cooperative device list to the base station, or report in response to a request of the base station.

In addition, when the base station determines that there is a change in the received information list, the base station may transmit the change to the corresponding source device.

Meanwhile, the passive scan type and the conventional IEEE 802.11 wireless technology are applied, and when the source device does not receive the beacon notification signal of the access point (AP) for a certain period of time, the source device receives the access point. Candidate cooperative devices associated with the (AP) may be excluded from the candidate cooperative device list.

In addition, when an active scan type and a conventional IEEE 802.11 wireless technology are applied, the source device may transmit a probe request message to a corresponding access point at a predetermined time point.

In this case, if a probe response message has not been received from the access point AP more than a preset number of times, the source device may exclude candidate cooperative devices associated with the access point from the candidate cooperative device list. have.

Through the above-described method, the source device having mobility may periodically or aperiodically update information on a plurality of candidate cooperative devices that are located close to itself, so that client cooperation may be smoothly performed. have.

Meanwhile, FIG. 16 is a diagram illustrating a configuration of a preferred embodiment of a base station apparatus 1610 and a communication apparatus 1620 supporting a multiple radio access system according to the present invention. In the above description, terms used for a terminal, a communication device, and a communication device are used interchangeably.

Referring to FIG. 16, the base station apparatus 1610 according to the present invention may include a receiving module 1611, a transmitting module 1612, a processor 1613, a memory 1614, and a plurality of antennas 1615. . The plurality of antennas 1615 means a base station apparatus supporting MIMO transmission and reception. The receiving module 1611 may receive various signals, data, and information on uplink from the terminal. The transmission module 1612 may transmit various signals, data, and information on downlink to the terminal. The processor 1613 may control the overall operation of the base station apparatus 1610.

The processor 1613 of the base station apparatus 1610 may include information on whether CC operation can be supported in a multiple radio access system (eg, support information), and movement speed information (eg, floating, low). Source device by considering location information, location information, existence and number of candidate cooperative devices in the vicinity, power reserve information, channel state information (for example, high quality state), and the like. And whether the CC operation can be performed and the candidate cooperative device may be determined.

In addition, the processor 1613 of the base station apparatus 1610 compares the access point (AP) information received from each of the candidate cooperative devices with the access point (AP) information received from the source device to determine whether there is the same access point (AP). It can be determined.

In addition, the processor 1613 of the base station apparatus 1610 may control to transmit information about at least one candidate cooperative device located near the same access point (AP) as the source device among the plurality of candidate cooperative devices to the source device. Can be.

In addition, the processor 1613 of the base station apparatus 1610 performs a function of processing the information received by the base station apparatus 1610, information to be transmitted to the outside, and the like. The memory 1614 stores the processed information and the like for a predetermined time. And may be replaced by a component such as a buffer (not shown).

Referring to FIG. 16, a terminal device 1620 according to the present invention may include a receiving module 1621, a transmitting module 1622, a processor 1623, a memory 1624, and a plurality of antennas 1625. The plurality of antennas 1625 mean a terminal device supporting MIMO transmission and reception. The receiving module 1621 may receive various signals, data, and information on downlink from the base station. The receiving module 1622 may transmit various signals, data, and information on the uplink to the base station. The processor 1623 may control operations of the entire terminal device 1620.

The processor 1623 of the terminal device 1620 may control to receive access point (AP) information from an access point (AP) adjacent to a current position among the plurality of access points (AP).

In addition, the processor 1623 of the terminal device 1620 may control to periodically perform an operation of monitoring candidate cooperative device information in order to maintain a list of information on the latest candidate cooperative device.

In addition, the processor 1623 of the terminal device 1620 may update the candidate cooperative device list for performing the CC operation using the received candidate cooperative device information.

In addition, the processor 1623 of the terminal device 1620 performs a function of processing the information received by the terminal device 1620, information to be transmitted to the outside, and the memory 1624 stores the processed information and the like for a predetermined time. And may be replaced by a component such as a buffer (not shown).

Specific configurations of the base station apparatus and the terminal apparatus as described above may be implemented so that the above-described matters described in various embodiments of the present invention may be independently applied or two or more embodiments may be applied at the same time. Omit.

In addition, in the description of FIG. 16, the description of the base station apparatus 1610 may be equally applicable to a relay apparatus as a downlink transmitting entity or an uplink receiving entity, and the description of the terminal device 1620 is used for downlink reception. The same may be applied to the relay apparatus as a subject or an uplink transmission subject.

Embodiments of the present invention described above may be implemented through various means. For example, embodiments of the present invention may be implemented by hardware, firmware, software, or a combination thereof.

For implementation in hardware, a method according to embodiments of the present invention may include one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), and Programmable Logic Devices (PLDs). It may be implemented by field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.

In the case of an implementation by firmware or software, the method according to the embodiments of the present invention may be implemented in the form of a module, a procedure, or a function that performs the functions or operations described above. The software code may be stored in a memory unit and driven by a processor. The memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The foregoing description of the preferred embodiments of the invention disclosed herein has been presented to enable any person skilled in the art to make and use the present invention. While the present invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. For example, those skilled in the art can utilize each of the configurations described in the above-described embodiments in a manner of mutually combining them. Accordingly, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

The invention can be embodied in other specific forms without departing from the spirit and essential features of the invention. Accordingly, the above detailed description should not be interpreted as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention. The present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. In addition, the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship or may be incorporated as new claims by post-application correction.

Claims (20)

In a method of performing communication by an access point (ACCESS POINT, AP) based terminal supporting multiple radio access technologies (Multi-RAT),
Receiving information about a first AP associated with the terminal from a plurality of APs from the first AP;
Transmitting information about the first AP to a base station;
Receiving information about at least one candidate cooperative terminal associated with the first AP from the base station; And
Transmitting the first data to the base station using the at least one candidate cooperative terminal,
The first data is communicated between the terminal and the at least one candidate cooperative terminal through a first radio access scheme, and between the at least one candidate cooperative terminal and the base station through a second radio access scheme. , How to perform communication. The method of claim 1,
And transmitting, by the terminal, the second data directly to the base station through the second wireless access scheme. The method of claim 1,
And the first wireless access method is a WiFi Fidelity (WiFi) connection method, and the second wireless access method is a WiMAX (Worldwide Interoperability for Microwave Access) connection method. The method of claim 1,
The information on the first AP includes at least one of Medium Access Control (MAC) address information and Service Set Identifier (SSID) information. The method of claim 1,
And information about the first AP is periodically received from the first AP. The method of claim 1,
The terminal further comprises the step of transmitting a probe request message (probe request message) to the first AP,
And the information about the first AP is received through a probe response message in response to the transmitted probe request message. The method of claim 1,
And monitoring, by the terminal, periodically whether information on the at least one candidate cooperative terminal has been received. In a method for a candidate cooperative terminal based on an access point (AP) supporting multi-radio access technology (Multi-RAT) to perform communication,
Receiving information about a first AP associated with the candidate cooperative terminal from a plurality of APs from the first AP;
Transmitting information about the first AP to a base station;
Receiving first data from a terminal associated with the first AP; And
Transmitting the received first data to the base station;
And the first data is communicated between the terminal and the candidate cooperative terminal through a first radio access scheme, and is communicated between the candidate cooperative terminal and the base station through a second radio access scheme. The method of claim 8,
And the first wireless access method is a WiFi Fidelity (WiFi) connection method, and the second wireless access method is a WiMAX (Worldwide Interoperability for Microwave Access) connection method. The method of claim 8,
Receiving an activation request message for client cooperation from the base station,
And transmitting information about the first AP to a base station in response to the activation request message. The method of claim 8,
The information on the first AP includes at least one of Medium Access Control (MAC) address information and Service Set Identifier (SSID) information. The method of claim 8,
And information about the first AP is periodically received from the first AP. The method of claim 8,
The terminal further comprises the step of transmitting a probe request message (probe request message) to the first AP,
And the information about the first AP is received through a probe response message in response to the transmitted probe request message. In a method for communication by an access point (ACCESS POINT, AP) based base station supporting multiple radio access technology (Multi-RAT),
Receiving information about an AP associated with each of the plurality of candidate cooperative terminals among a plurality of APs from a plurality of candidate cooperative terminals;
Receiving information on a first AP associated with the terminal from among the plurality of APs; And
And transmitting information on at least one candidate cooperative terminal associated with the first AP among APs associated with each of the plurality of candidate cooperative terminals, to the terminal.
The base station communicates first data with the terminal using the at least one candidate cooperative terminal,
The first data is communicated between the terminal and the at least one candidate cooperative terminal through a first radio access scheme, and between the at least one candidate cooperative terminal and the base station through a second radio access scheme. , How to perform communication. The method of claim 14,
And directly receiving second data from the terminal through the second wireless access scheme. The method of claim 14,
And the first wireless access method is a WiFi Fidelity (WiFi) connection method, and the second wireless access method is a WiMAX (Worldwide Interoperability for Microwave Access) connection method. The method of claim 14,
The at least one candidate cooperative terminal,
What is determined by the base station using at least one of information on whether the client cooperation operation can be supported, moving speed information, location information, power reserve information, channel state information, the presence and number of neighboring candidate cooperative terminal Characterized in that the method of performing communication. In an access point (ACCESS POINT, AP) based terminal that supports multiple radio access technologies (Multi-RAT),
A receiving module for receiving information on a first AP associated with the terminal from among the plurality of APs from the first AP and receiving information on at least one candidate cooperative terminal associated with the first AP from a base station;
A transmission module for transmitting information about the first AP to a base station, and transmitting first data to the base station using the at least one candidate cooperative terminal; And
A processor configured to control the first data to be communicated between the terminal and the at least one candidate cooperative terminal through a first radio access scheme, and to communicate with the at least one candidate cooperative terminal and the base station through a second radio access scheme. Including, the terminal. In a candidate cooperative terminal based on an access point (AP) supporting multi-radio access technology (Multi-RAT),
A receiving module for receiving information on a first AP associated with the candidate cooperative terminal from a plurality of APs from the first AP and receiving first data from a terminal associated with the first AP;
A transmission module for transmitting the information about the first AP to a base station, and transmitting the received first data to the base station; And
And a processor configured to control the first data to be communicated between the terminal and the candidate cooperative terminal through a first wireless access scheme, and communicate between the candidate cooperative terminal and the base station through a second wireless access scheme. . In an access point (ACCESS POINT, AP) based base station supporting multiple radio access technologies (Multi-RAT),
A receiving module for receiving information about an AP associated with each of the plurality of candidate cooperative terminals among a plurality of APs from a plurality of candidate cooperative terminals, and receiving information about a first AP associated with the terminal among the plurality of APs from a terminal;
A transmission module for transmitting information about at least one candidate cooperative terminal associated with the first AP among APs associated with each of the plurality of candidate cooperative terminals; And
The base station communicates first data with the terminal using the at least one candidate cooperating terminal, the first data is communicated between the terminal and the at least one candidate cooperating terminal through a first wireless access scheme, and And a processor for controlling communication between at least one candidate cooperating terminal and the base station via a second wireless access scheme.

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