KR101733494B1 - Apparatus and method for transceiving data in a wireless access system - Google Patents

Abstract

The present invention relates to a method for determining a relay performing terminal in a M2M communication system, transmitting / receiving data to / from a base station or other terminal through a determined relay terminal, and a frame configuring method for data transmission / reception in an M2M communication system, Receiving from a base station a first message including a relay operation parameter which is information indicating a transmission or reception operation in at least one of a downlink interval and an uplink interval in a frame, The M2M terminal can transmit and receive signals with the base station or the other M2M terminal by the data transmission and reception method including transmitting and receiving data with the base station or the other terminal based on the operation parameters, And can be configured efficiently.

Description

TECHNICAL FIELD [0001] The present invention relates to a method and apparatus for transmitting / receiving data in a wireless access system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless access system, and more particularly, to a method and apparatus for transmitting / receiving data between a base station and another terminal in a system supporting inter-device communication.

1 shows an example of a frame structure supported by an 802.16 system.

Referring to FIG. 1, a superframe (SF) includes a superframe header (SFH) and four frames (F0, F1, F2, F3). The length of each frame in a superframe may be the same. The size of each super frame is 20 ms, and the size of each frame is 5 ms, but the present invention is not limited thereto. The length of the superframe, the number of frames included in the superframe, the number of subframes included in the frame, and the like can be variously changed. The number of subframes included in a frame may be variously changed according to a channel bandwidth and a length of a CP (Cyclic Prefix).

One frame includes a plurality of subframes (subframes SF0, SF1, SF2, SF3, SF4, SF5, SF6, SF7). Each subframe may be used for uplink or downlink transmission. One subframe includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols or orthogonal frequency division multiple access (OFDMA) in a time domain and includes a plurality of subcarriers in a frequency domain. do.

An OFDM symbol is used to represent one symbol period and may be called another name such as an OFDMA symbol and an SC-FDMA symbol according to a multiple access scheme. The subframe may be composed of 5, 6, 7 or 9 OFDMA symbols, but this is only an example and the number of OFDMA symbols included in the subframe is not limited. The number of OFDMA symbols included in the subframe may be variously changed according to the channel bandwidth and the length of the CP.

The type of the subframe can be defined according to the number of OFDMA symbols included in the subframe. For example, a Type-1 subframe may be defined as including 6 OFDMA symbols, a Type-2 subframe as 7 OFDMA symbols, a Type-3 subframe as 5 OFDMA symbols, and a Type-4 subframe as 9 OFDMA symbols have. One frame may include all subframes of the same type. Or one frame may include different types of subframes. That is, the number of OFDMA symbols included in each subframe in one frame may be the same or different from each other. Alternatively, the number of OFDMA symbols in at least one subframe in one frame may be different from the number of OFDMA symbols in the remaining subframes in the frame.

A TDD (Time Division Duplex) scheme or an FDD (Frequency Division Duplex) scheme may be applied to the frame. In the TDD scheme, each subframe is used for uplink transmission or downlink transmission at different times at the same frequency.

That is, the subframes in the TDD frame are divided into the uplink subframe and the downlink subframe in the time domain. In the FDD scheme, each subframe is used for uplink transmission or downlink transmission at different frequencies at the same time. That is, subframes in a frame of the FDD scheme are divided into an uplink subframe and a downlink subframe in the frequency domain. The uplink transmission and the downlink transmission occupy different frequency bands and can be performed at the same time.

The SFH can carry essential system parameters and system configuration information. The SFH may be located in the first subframe within the superframe. SFH may occupy the last 5 OFDMA symbols of the first subframe.

The superframe header can be classified into a primary SFH (P-SFH) and a secondary SFH (S-SFH). P-SFH and S-SFH can be transmitted every super frame. The S-SFH can be transmitted in two consecutive super frames. Information transmitted to the S-SFH can be divided into three sub-packets: S-SFH SP1, S-SFH SP2, and S-SFH SP3. Each subpacket can be transmitted periodically with different periods. SFH SP1, S-SFH SP2, and S-SFH SP3 may be different from each other, and the S-SFH SP3 may be transmitted in the shortest cycle and the S-SFH SP3 may be transmitted in the longest cycle. The S-SFH SP1 includes information about network re-entry. The S-SFH SP2 includes information about an initial network entry and network discovery. S-SFH SP3 contains the remaining important system information.

One OFDMA symbol includes a plurality of subcarriers, and the number of subcarriers is determined according to the FFT size. There are several types of subcarriers. The types of subcarriers can be divided into data subcarriers for data transmission, pilot subcarriers for various estimation, guard bands, and null carriers for DC carriers.

Hereinafter, a brief description will be given of machine to machine (M2M) communication.

The inter-device communication (M2M) means the communication between the electronic device and the electronic device as the name implies. That is, it means communication between objects. Generally, the term " wired or wireless communication between electronic devices " refers to communication between a device and a machine controlled by a person, but is used to specifically mean wireless communication between an electronic device and an electronic device. In addition, the M2M terminals used in the cellular network are less capable or capable than the general terminals.

In the M2M environment, it has characteristics such as 1) a large number of terminals in a cell, 2) a small amount of data, 3) a low transmission frequency, 4) a limited number of data characteristics, and 5)

Many M2M terminals in the cell having the above-described characteristics can transmit / receive signals between the MTU terminals or the BS using a multi-hop configuration or using a hierarchical structure.

However, when a multi-hop configuration or a hierarchical structure is established between the MTU terminals in a system supporting inter-device communication, a specific method for transmitting and receiving data between the base station and the other terminals is not proposed.

It is an object of the present invention to provide a method for determining a relay performing terminal in a M2M communication system and transmitting / receiving data to / from a base station or another terminal through a determined relay terminal.

It is another object of the present invention to provide a method of constructing a frame for data transmission and reception in a case of having a hierarchical structure or a multi-hop structure between devices in an M2M communication system.

The present invention relates to a method of operating a terminal for performing a relay operation in a radio access system, the method comprising: receiving a first message including a relay operation parameter from a base station; And transmitting and receiving data with the base station or the other terminal based on the received relay operation parameter, wherein the relay operation parameter includes at least one of transmission and reception operations in at least one of a downlink interval and an uplink interval in a frame And the like.

In addition, the terminal and the other terminal are M2M terminals supporting inter-device communication.

The first message may further include switching period information for instructing to switch a transmission or reception operation determined by the relay operation parameter in units of frames or superframes.

In the case of the multi-hop relay, the first message may include information on a lower layer terminal, information on a switching gap, information on resource allocation, pilot signal information, A Connection ID for Relaying, and a Flow ID for Relaying.

Receiving an M2M relay operation trigger signal from the base station; And transmitting a response signal to the received base station relay operation trigger signal to the base station.

The response signal may include at least one of a channel quality indicator, channel state information, a signal to interference plus noise ratio, an interference level, a path loss, And a Relaying Support Indicator (Relaying Support Indicator).

Transmitting a link measurement signal to the other terminal; Receiving link information measured by the link measurement signal from the other terminal; Setting a link transmission parameter based on the received link information; And transmitting an M2M Relaying Request message to the BS, wherein the MRM relaying request message includes an M2M relaying confirm message indicating that the preparation for performing the MME relay is completed indicator.

Transmitting a link measurement signal to the other terminal; Receiving link information measured by the link measurement signal from the other terminal; Transmitting the received link information to the base station through an M2M Relaying Request message; And receiving a M2M Relaying Response message from the base station, wherein the MIM relay response message includes a link transmission parameter and a MIM relaying confirmation indicator indicating that preparation for performing MIM relay is completed . Also, the relay operation parameter indicates a receiving operation for data reception from the base station in the downlink interval of the first frame, and transmits the data received in the downlink of the first frame to the other terminal in the downlink interval of the second frame And instructs a transmission operation for transmission.

In addition, the relay operation parameter indicates a receiving operation for data reception from the other terminal in the uplink section of the first frame, and transmits data received in the uplink of the first frame in the uplink section of the second frame to the base station And instructs a transmission operation for transmission.

In addition, the relay operation parameter indicates a reception operation for data reception from the base station in the downlink interval of the first frame, a reception operation is instructed for data reception from the other terminal in the uplink interval of the first frame, A transmission operation is instructed to transmit the data received in the downlink of the first frame to the other terminal in a downlink section of two frames and a transmission operation is instructed to be received in the uplink section of the first frame in the uplink section of the second frame And instructs a transmission operation to transmit the data to another terminal (or base station).

In addition, the relay operation parameter indicates a reception operation for data reception from the base station in the downlink interval of the first frame, and receives data received in the downlink interval of the first frame in the uplink interval of the first frame Wherein the control unit instructs a transmission operation to transmit data to the mobile station in a downlink interval of the second frame in a downlink interval of the second frame in an uplink interval of the second frame, And instructs the base station to operate in a transmission mode to transmit the received data to the base station.

In addition, the relay operation parameter indicates a reception operation for data reception from the base station in a transmission period of a superframe header.

In addition, the relay operation parameter instructs a receiving operation to receive relaying control information from a base station in a downlink interval of each frame, instructs a receiving operation to receive data from the other terminal in the uplink area of the first frame, And instructs a transmission operation to transmit data received from the other terminal to the base station in the uplink area of two frames

In addition, the relay operation parameter instructs a receiving operation for data reception from the base station in the downlink interval of each frame, instructs a receiving operation to receive data from the other terminal in the uplink area of the first frame, And instructs a transmission operation to transmit data received from the other terminal to the base station in the uplink area of the uplink.

The downlink section may be divided into a downlink access zone and a downlink relay zone, and a signal to be transmitted to another terminal may be received in a downlink relay zone.

Also, the uplink section is divided into an uplink access zone and an uplink relay zone, and a signal to be transmitted to the base station is received in the uplink relay zone.

In addition, the relay operation parameter indicates a reception operation for data reception from the base station in the downlink interval of the first frame, and receives data received in the downlink interval of the first frame in the uplink interval of the first frame A transmission operation is instructed to transmit data to a base station in a downlink interval of a second frame and a reception operation is performed to receive data from another terminal in an uplink interval of the second frame And the downlink section is divided into a downlink access zone and a downlink relay zone, and the uplink section is divided into an uplink access zone and an uplink relay zone.

The present invention also relates to a wireless access system, comprising: a wireless communication unit for transmitting and receiving a wireless signal to / from an external device; And a control unit connected to the wireless communication unit, wherein the control unit controls the wireless communication unit to receive a first message including a relay operation parameter from the base station, and based on the received relay operation parameter, The relay operation parameter is information for instructing a transmission or reception operation in at least one of a downlink interval and an uplink interval in a frame.

Further, the terminal and the other terminal are characterized by being an IMT terminal.

According to the embodiment of the present invention, the M2M terminal can transmit / receive signals to / from the base station or another M2M terminal by a message including information on frame configuration and operation.

According to an embodiment of the present invention, frames of the base station and the M2M terminal can be efficiently configured by the message taking into account the characteristics of the M2M communication.

1 shows an example of a frame structure in an 802.16m system.
FIG. 2 illustrates an example of a M2M communication system according to an embodiment of the present invention.
3 is an internal block diagram of a terminal and a base station constituting a system supporting the DMT communication according to an embodiment of the present invention.
4 is a diagram illustrating an M2M communication procedure according to an embodiment of the present invention.
5 is a diagram illustrating an M2M communication procedure when a link for data relaying is determined by a base station according to an embodiment of the present invention.
6 is a diagram illustrating a frame operation in an M2M communication according to an embodiment of the present invention.
7 is a diagram illustrating a frame operation in an M2M communication according to another embodiment of the present invention.
8 is a diagram illustrating a frame operation in an M2M communication according to another embodiment of the present invention.
9 is a diagram illustrating a frame operation in the M2M communication according to another embodiment of the present invention.
10 is a diagram illustrating a frame operation in an M2M communication according to another embodiment of the present invention.
11 is a diagram illustrating a frame operation in an M2M communication according to another embodiment of the present invention.
12 is a diagram illustrating a frame operation in the M2M communication according to another embodiment of the present invention.
13 is a diagram illustrating a frame operation in the M2M communication according to another embodiment of the present invention.
14A and 14B are diagrams showing a frame operation in the M2M communication according to another embodiment of the present invention.
15A and 15B are diagrams showing a frame operation in the M2M communication according to another embodiment of the present invention.

The following description will be made on the assumption that the present invention is applicable to a CDMA system such as Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Orthogonal Frequency Division Multiple Access (OFDMA), and Single Carrier Frequency Division Multiple Access And can be used in various wireless communication systems. CDMA may be implemented in radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. The TDMA may be implemented in a wireless technology 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 wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and Evolved UTRA (E-UTRA). IEEE 802.16m is an evolution of IEEE 802.16e, providing backward compatibility with systems based on IEEE 802.16e.

UTRA is part of the Universal Mobile Telecommunications System (UMTS). The 3rd Generation Partnership Project (3GPP) LTE (Long Term Evolution) is a part of E-UMTS (Evolved UMTS) using Evolved-UMTS Terrestrial Radio Access (E-UTRA). It adopts OFDMA in downlink and SC -FDMA is adopted. LTE-A (Advanced) is the evolution of 3GPP LTE.

For clarity of description, IEEE 802.16m is mainly described, but the technical idea of the present invention is not limited thereto.

First, terms used in the M2M system are summarized as follows.

(1) Machine-to-Machine (M2M) communication: Information exchange that can be performed between a user equipment through a base station or between a server and a device in the core network, through a base station, without human intervention.

(2) M2M ASN: An access service network capable of supporting the M2M service.

(3) M2M Device: A terminal having (or supporting) M2M function.

(4) M2M subscriber: A consumer of M2M service.

(5) M2M Server: An entity that can communicate with an M2M device. The M2M server provides an interface that can be accessed by M2M subscribers.

(6) M2M feature: refers to the unique characteristics of M2M applications supported by M2M ASN. One or more features may be needed to support the application.

(7) M2M group: A group of MTU terminals sharing a common and / or the same M2M subscribers, i.e., sharing one or more characteristics.

FIG. 2 illustrates an example of a M2M communication system according to an embodiment of the present invention.

As shown in FIG. 2, the M2M communication system may include a base station 100, a first terminal 200, and a second terminal 300.

Here, the first terminal and the second terminal are terminals supporting the DM communication.

Here, the first terminal and the second terminal may be fixed or mobile, and may be a user equipment (UE), a user terminal (UT), a subscriber station (SS), a wireless device, It can be called another term.

A base station generally refers to a fixed station that communicates with a terminal and may be referred to by other terms such as a Node B, a Base Transceiver System (BTS), and an Access Point. One base station 20 may have more than one cell.

The MBMS communication system may be an OFDM (Orthogonal Frequency Division Multiplexing) / OFDMA (Orthogonal Frequency Division Multiple Access) based system.

OFDM uses multiple orthogonal subcarriers. OFDM utilizes the orthogonality property between IFFT (inverse fast Fourier transform) and FFT (fast Fourier transform). In the transmitter, data is transmitted by performing IFFT. The receiver performs an FFT on the received signal to recover the original data. The transmitter uses an IFFT to combine multiple subcarriers, and the receiver uses a corresponding FFT to separate multiple subcarriers.

Also, a slot is defined as a time and a subchannel with a minimum possible data allocation unit. In the uplink, a subchannel may be composed of a plurality of tiles. The subchannel consists of 6 tiles and one burst in the uplink can be composed of 3 OFDM symbols and 1 subchannel.

Partial Usage of Subchannels (PUSC) In permutation, each tile may contain 4 adjacent subcarriers on 3 OFDM symbols. Alternatively, each tile may comprise three contiguous sub-carriers on three OFDM symbols. A bin contains 9 contiguous subcarriers on an OFDM symbol. A band refers to a group of four rows of bins, and an AMC (Adaptive Modulation and Coding) subchannel consists of six adjacent bins in the same band.

Referring to FIG. 2, the BS 100, the first MS 200, and the second MS 300-a and 300-1 through 300-N may be connected to each other via a wired or wireless communication network. The first terminal 200 is a terminal that receives a signal directly from the base station 100 and performs relaying transmission. All terminals included in the M2M communication system are selected by the first terminal 200 . A terminal of the M2M terminal excluding the first terminal 200 may be referred to as a second terminal 300. [

According to an embodiment of the present invention, the BS 100 may transmit a signal to the first MS 200. [ At this time, the first terminal 200 may receive a signal from the base station 100 and transmit the signal to the second terminal 300. That is, according to an embodiment of the present invention, the BS 100, the first MS 200 and the second MS 300 transmit signals using a hierarchical or multi-hop structure You can.

For example, in the downlink interval, the first MS 200 may receive a signal transmitted from the BS 100. The first terminal 200 may transmit the received signal to the second terminal 300. In this case, the second terminal 300-1 receiving the signal from the first terminal 200 can also transmit the received signal to the second terminals 300-a and 300-2 through 300-N . In the uplink period, the upper first terminal 200 receives signals transmitted from the lower second terminals 300-a and 300-1 to 300-N and transmits them to the base station 100 .

3 is an internal block diagram of a terminal and a base station that constitute an MBMS communication system according to an embodiment of the present invention.

The terminal 200 includes a control unit 210, a memory 220, and a radio communication (RF) unit 230.

FIG. 3 illustrates an internal block diagram of the first terminal shown in FIG. 2, but an internal block diagram of the terminal shown in FIG. 3 is also applied to the second terminal shown in FIG.

The terminal also includes a display unit, a user interface unit, and the like.

The control unit 210 implements the proposed functions, procedures and / or methods. The layers of the air interface protocol may be implemented by the controller 210.

The memory 220 is connected to the controller 210 and stores protocols and parameters for performing wireless communication. That is, it stores a terminal drive system, an application, and general files.

The RF unit 230 is connected to the control unit 210 to transmit and / or receive a radio signal.

In addition, the display unit displays various information of the terminal, and can use well known elements such as a liquid crystal display (LCD), an organic light emitting diode (OLED), and the like. The user interface unit may be a combination of a well-known user interface such as a keypad or a touch screen.

The base station 100 includes a controller 110, a memory 120, and a radio frequency (RF) unit 130.

The control unit 110 implements the proposed functions, procedures and / or methods. The layers of the air interface protocol may be implemented by the controller 110.

The memory 120 is connected to the controller 110 and stores protocols and parameters for performing wireless communication.

The RF unit 130 is connected to the control unit 110 to transmit and / or receive a radio signal.

The controllers 110 and 210 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices. The memory 120, 220 may comprise a read-only memory (ROM), a random access memory (RAM), a flash memory, a memory card, a storage medium, and / The RF units 130 and 230 may include a baseband circuit for processing a radio signal. When the embodiment is implemented in software, the above-described techniques may be implemented with modules (processes, functions, and so on) that perform the functions described above. The modules are stored in the memories 120 and 220 and can be executed by the controllers 110 and 210. [

The memories 120 and 220 may be internal or external to the controllers 110 and 210 and may be connected to the controllers 110 and 210 by various well known means.

4 is a diagram illustrating an M2M communication procedure according to an embodiment of the present invention. As shown in FIG. 4, the base station can determine the first terminal to perform the relaying transmission. This can be used when link establishment for data relaying between terminals is not performed.

In order to determine the first terminal, the base station may transmit an M2M relay operation trigger signal to a terminal in the cell (S210). The M2M relay operation trigger signal may include a request message to transmit to the base station information that may be considered in determining the first terminal.

At this time, the base station can transmit the M2M relay operation trigger signal to the terminal in the cell using at least one of Broadcast, Multicast, and Unicast.

Upon receiving the M2M relay operation trigger signal from the base station, the terminal receives the received signal power, capacity, current status, interference power or interference level, (SINR or SIR), and the like, the response signal can be transmitted to the base station (S220).

The response signal may include information necessary for determining the first terminal.

For example, the response signal may include a channel quality indicator, channel state information, a signal to interference plus noise ratio, an interference level, a path loss, , And a Relaying Support Indicator.

The base station receiving the response signal from the terminal in the cell may select a first terminal suitable for relay transmission using the information included in the response signal. If a first terminal suitable for relay transmission is selected, the base station can transmit the first message to the first terminal (S230). The first message may include a signal for instructing the first terminal to perform a relay operation.

In addition, the first message may include information necessary for performing frame setting and relaying operations. Also, the first message may include relay operation parameters and switching period information. The relay operation parameter may include information for instructing operation in at least one of a transmission mode and a reception mode in at least one of a downlink interval and an uplink interval in a frame.

The switching period information may include a predetermined period for switching the transmission mode or the reception mode determined by the relay operation parameter. According to an embodiment of the present invention, the predetermined period may be at least one of a frame unit, an integer multiple of a frame, a super frame unit, and an integer multiple of a super frame.

According to an embodiment of the present invention, the first message may include at least one of a lower layer terminal information, a switching gap information, a resource allocation information, a pilot signal information, A flow ID information for relaying, a group information ID (grouping ID, a group indicator, a number of group) for relaying, a connection ID for relaying, And the like. According to an embodiment of the present invention, the BS can transmit the first message to the second terminal.

According to an embodiment of the present invention, the first message may be set such that the transmission mode / reception mode characteristic of the frame is always opposite between the adjacent hops (Hop) during data transmission / reception of the base station and the terminal.

In another embodiment of the present invention, the first message may be configured to set the overall period so that the terminal operates in a reception mode in a frame in which a superframe header including system information is to be read. For example, if there are frames 1, 2, 3, and 4 in the super frame, the first terminal can operate in the reception mode, the transmission mode, the reception mode, and the transmission mode, have.

On the other hand, when the relaying is performed in the downlink interval, the power consumption is larger than that in the case of performing the relaying in the uplink interval. In addition, there is a case that all the terminals need to read the super frame header at the same time. According to another embodiment of the present invention, the first message may perform relaying only in an uplink section without performing relaying in a downlink section during data transmission / reception between a base station and a terminal, considering the above matters .

For example, during data transmission and reception, all terminals exist in a downlink section for a base station in a downlink section of one frame, and may switch a reception mode and a transmission mode for a frame section only for an uplink section. In this case, all terminals can share the system information from the base station, and power loss can be reduced.

According to another embodiment of the present invention, in the first message, all terminals in a subframe in which a superframe header exists exist in a reception mode, and subframes in the remaining downlink sections operate in a transmission mode and a reception mode As shown in FIG.

Also, according to another embodiment of the present invention, the first message may be defined such that a specific subframe or a specific symbol is transmitted between terminals so as to measure channel information between the terminals.

On the other hand, there are cases where it is necessary to transmit all terminals directly to the base station. For example, there is a case where the terminal must make an entry in the base station. Therefore, as another embodiment of the present invention, the first message may periodically or arbitrarily define an uplink interval that all terminals can simultaneously transmit to the base station. In this case, each terminal must have capability to transmit not only to the upper terminal but also to the base station in the uplink section.

The concrete data transmission / reception process according to the first message will be described later with reference to FIG. 4 to FIG.

The first terminal receiving the first message from the base station can perform a link process with the second terminal using information included in the message. First, the first terminal may transmit a link measurement signal to the second terminal (S250). The link measurement signal may include a message requesting information necessary for link measurement. The second terminal receiving the link measurement signal may transmit the link information measured by the link measurement signal to the first terminal (S260). In this case, according to the first embodiment, the first terminal can directly set a link transmission parameter for the link using the link information transmitted from the second terminal.

When the first terminal directly sets the link transmission parameter, the first terminal may transmit an M2M relaying request message to the base station after setting a link transmission parameter (S270) . The M2M relaying request message includes an indicator indicating that the M2M relaying is ready to perform, and is a signal for informing the BS. Upon receiving the M2M relaying request message, the BS may transmit data to be transmitted to the first terminal (S280). The first terminal may transmit the data to the second terminal (S290). The first MS transmits a start time indicator, a time offset, a bandwidth request, and channel information (CQI, SINR, and interference level information) to the BS to the relay station through the M2M relaying request message, The base station having received the signal transmits data for relaying at a requested time using the information or transmits data through a M2M relaying response message as a response signal to the signal The MCS, the MCS, and the power control information, and then performs data transmission.

Meanwhile, according to the second embodiment of the present invention, the first terminal can receive the link transmission parameter from the base station. In this case, the first terminal may transmit an M2M relaying request message to the base station (S270). The M2M relaying request message may include link state information (CQI, SINR, interference level, pathloss) received from the second terminal and information related to a link transmission parameter for performing M2M relaying control, MCS, MIMO, time offset, allocation). And channel information between the first terminal and the base station. Upon receiving the M2M relaying request message, the BS determines an M2M relaying transmission using the received information. When performing relaying, the BS transmits a link transmission parameter to a first relay station using an M2M relaying response message. To the terminal. At this time, the message includes a relaing start time indicator (symbol, subframe or frame unit) and M2M relaying confirm information, and the information indicates whether or not the relaying operation of the device is performed. The base station may transmit the data to be transmitted to the first terminal after the M2M relaying response message is transmitted (S280). The first terminal may transmit the data to the second terminal (S290).

5 is a flowchart illustrating an M2M communication procedure when a link for data relaying is determined by the base station (paging / grouping between the first terminal and the second terminal is determined by the base station) Fig.

As shown in FIG. 5, according to another embodiment of the present invention, the link for data relaying can be determined by the base station, and the process of determining the first terminal to perform relaying is omitted . The first terminal can receive the first message from the base station (S330), and the subsequent steps are the same as those described above, so the description will be omitted.

Hereinafter, a description will be made on a frame configuration and an operation considering characteristics of M2M communication that can transmit data intermittently, low mobility may be low or fixed, and is not sensitive to latency. The process of transmitting and receiving data between the base station, the first terminal and the second terminal will be described in detail with reference to FIGS. 6 to 15. FIG. Figs. 6 to 15 show only a part of the whole frame. Therefore, it is apparent to those skilled in the art that the frame structure shown is a part of the whole and that the frame structure shown can be repeated continuously.

6 is a diagram showing a frame operation in M2M communication for switching from downlink to frame unit. As shown in FIG. 6, according to an embodiment of the present invention, the first terminal can transmit / receive a signal by switching the downlink interval of the frame into a transmission mode and a reception mode on a frame-by-frame basis. When the base station, the first terminal, and the second terminal are hierarchically connected to each other, the base station can transmit a signal to the first terminal connected to the lower terminal using the downlink interval of the i-th frame.

At this time, the first terminal receives the signal transmitted from the base station using the existing frame structure in the i-th frame. At this time, the downlink interval of the i < th > frame of the first terminal may operate in a receiving mode to receive a signal from the base station. The first terminal receiving the signal from the base station can transmit a signal to the second terminal using the downlink interval of the next frame ((i + 1) th frame). At this time, the downlink interval of the (i + 1) th frame of the first terminal is switched from the receiving mode to the transmitting mode in order to transmit a signal to the second terminal.

Therefore, according to the present embodiment, TTG (Tx / Rx Transition Gap) may not be required, and it is possible to transmit additional signals using TTG. In this manner, the frame structure of the first terminal may be switched to the reception mode and the transmission mode in the downlink section on a frame-by-frame basis for signal transmission to the second terminal.

Fig. 7 is a diagram showing a frame operation in M2M communication for switching from uplink to frame unit. Fig.

As shown in FIG. 7, according to an embodiment of the present invention, the first terminal can transmit / receive a signal by switching the uplink interval of the frame into a transmission mode and a reception mode on a frame-by-frame basis. When the base station, the first terminal and the second terminal are hierarchically connected to each other, the second terminal can transmit a signal to the first terminal connected to the upper terminal using the uplink interval of the i-th frame.

At this time, the first terminal receives the signal transmitted from the base station using the existing frame structure in the i-th frame. At this time, the uplink interval of the i < th > frame of the first terminal may operate in a reception mode to receive a signal from the base station. The first terminal receiving the signal from the second terminal can transmit a signal to the base station using the uplink interval of the next frame ((i + 1) th frame).

At this time, the uplink interval of the (i + 1) th frame of the first terminal is switched from the receiving mode to the transmitting mode in order to transmit a signal to the second terminal.

Therefore, according to the present embodiment, RTG (Rx / Tx Transition Gap) may not be required, and it is possible to transmit additional signals using RTG. In this way, the frame structure of the first MS may be switched to the reception mode and the transmission mode in the uplink interval on a frame-by-frame basis for signal transmission to the BS.

As shown in FIGS. 6 and 7, when a downlink section and an uplink section of an existing frame structure are used in an M2M communication system, a first terminal transmitting and receiving a signal with a base station or a second terminal transmits / And performs transmission mode / reception mode switching.

According to an embodiment of the present invention, the transmission mode / reception mode switching switching may be performed frame by frame within a superframe or N frames by frame. Here, N may have a value of 2, 3, or 4.

According to an embodiment of the present invention, the switching may be performed by a multiple of a superframe or a superframe, or may be performed using a ratio of a transmission mode / reception mode frame in a subframe. The switching period may be appropriately selected in consideration of the role performed by the M2M communication.

6 and FIG. 7 illustrate a case where a base station, a first terminal, and a second terminal are connected by two hops. In this embodiment, a plurality of terminals are connected in a multi-hop manner The M2M terminal can transmit data to another M2M terminal using the above-described method.

FIG. 8 is a combination of FIG. 6 and FIG. 7, in which the first terminal operates in the reception mode in the i < th > frame and the downlink / uplink section Are all operating in the transmission mode. Also, in the i-th frame, the second terminal operates in both the downlink / uplink interval and the downlink / uplink interval in the i + 1 < th > frame.

That is, the UEs can switch between the transmission mode and the reception mode in units of frames or integer multiples thereof, and when set as described above, the mode characteristics between adjacent hops can always be reversed. Referring to FIG. 8, the first terminal can receive a signal in the i-th frame using the downlink / uplink interval from the base station and the second terminal.

Therefore, according to the above configuration, the TTG interval set for the downlink / uplink interval switching can be additionally allocated to the interval for transmitting the signal. That is, in the first UE, since the downlink and uplink in all the frames operate only in the transmission mode or the reception mode, the TTG interval can be allocated for signal transmission, and the contents can be applied to all frames. In addition, according to an embodiment of the present invention, switching of a frame to a transmission mode or a reception mode in accordance with a hop in which the terminal is linked can be performed in the reverse order.

9 is a diagram illustrating a case where a first terminal receives a signal from a base station in a downlink interval of an i-th frame, transmits a signal received from the base station in an uplink interval of an i-th frame to a lower terminal, And receives a signal from a lower terminal in a link interval and transmits a signal received from the lower terminal in an uplink interval of an (i + 1) th frame to a base station.

Referring to FIG. 9, the first terminal operates in a reception mode to receive a signal from the BS in a downlink interval of an i < th > frame, and transmits the received signal to a second terminal And may operate in a transmission mode for transmission. In this case, according to an embodiment of the present invention, the signal reception from the base station and the signal transmission to the second terminal can be performed in the same frame or in units of several frames.

The first terminal operates in a reception mode to receive a signal from the second terminal in the downlink interval of the (i + 1) th frame, and transmits the signal received in the uplink interval of the (i + 1) To operate in the transmission mode. In addition, in the case of the second terminal, it operates in a transmission mode in order to transmit a signal to the other terminal in the downlink interval of the i < th > frame, and receives Mode and operates in a transmission mode to transmit a signal to the first terminal in a downlink interval of an (i + 1) th frame, and operates in a transmission mode in order to receive a signal from another terminal in an uplink interval of an (i + Mode.

That is, in the case of the second terminal, a signal is transmitted to the other terminal in the downlink interval of the i < th > frame, and a frame of the first terminal is transmitted in the uplink interval of the i & Can operate in the opposite direction. The second terminal operates in a transmission mode in a downlink interval in a frame to transmit a signal to the first terminal in an (i + 1) th frame, and operates in a reception mode to receive a signal from a lower terminal in an uplink interval can do.

In order for a predetermined terminal to transmit signals in a hierarchical manner, a terminal in each layer switches a downlink / uplink interval of a frame to a reception mode / transmission mode or a transmission mode / reception mode every hop, Can be used. In addition, according to an embodiment of the present invention, the switching of the transmission mode / reception mode or the reception mode / transmission mode in the downlink / uplink section may be performed in units of frames, superframes, Lt; / RTI > In addition, signal transmission / reception between the terminal and the base station can be performed in one same frame, a plurality of frames, a super frame, or a plurality of super frames.

10 is a diagram illustrating an embodiment in which each terminal receives a signal using a downlink interval from the base station and transmits the signal of the terminal to the upper terminal using only the uplink interval in order to perform the M2M relaying.

Referring to FIG. 10, all terminals within a base station can receive signals directly from a base station in a downlink interval of an i-th frame, and can operate in a reception mode or a transmission mode in an uplink interval. Each terminal can receive relaying control information, such as switching information, resource allocation information, and the like, related to relay execution from the base station through a DL frame. In the frame structure as described above, since the terminals receive a signal through the downlink interval from the base station, there is no need to additionally perform synchronization for signal transmission of the terminal. In addition, since each terminal transmits information necessary for signal transmission from the base station, each terminal does not need to transmit a message to the lower terminal.

A method of transmitting and receiving data around a frame in which a downlink section and an uplink section of a frame are not divided into an access zone and a relay zone has been described. Hereinafter, a method of transmitting and receiving data in a frame in which a downlink section and an uplink section of a frame are divided into an access zone and a relay zone will be described in detail with reference to FIG. 11 to FIG.

When a plurality of M2M terminals are hierarchically connected to each other, a base station and an M2M terminal can use a conventional relay frame structure to transmit a signal to the M2M terminal. For example, the M2M terminal can transmit a signal to another M2M terminal using the IEEE 802.16m relay frame structure.

At this time, the M2M terminal has the same frame structure as the base station in the downlink section. That is, as shown in FIG. 6, the M2M terminal can transmit a signal to another M2M terminal through a transmission mode / reception mode switching in a frame or a superframe on a downlink section.

Here, referring to FIG. 11, the BS may divide the downlink and uplink intervals in a frame into access zones and relay zones, respectively, for relaying. Also, the M2M terminal can use the downlink section as an access zone and a relay zone, as in the frame structure of the base station. Here, the indication of the access zone and the relay zone is shown as an embodiment of the present invention, and may be defined differently in the frame structure of the M2M terminal.

11 is a diagram illustrating a method of dividing a downlink section into two areas and transmitting the downlink section according to each application when a base station transmits a signal to a second terminal through a first terminal in a downlink section.

As shown in FIG. 11, a first terminal that transmits a signal to a second terminal receives a signal for a corresponding terminal through an access zone in a downlink interval of an i < th > frame, 2 < / RTI > terminal.

The first terminal, which has received the signal for the terminal and the signal to be transmitted to the second terminal from the base station, uses the access zone and the relay zone of the downlink section of the next frame ((i + 1) th frame) The BS may transmit a signal to the second terminal as the BS transmits to the first terminal. In this case, the downlink interval in the (i + 1) th frame is switched from the reception mode to the transmission mode. Also, according to an embodiment of the present invention, the first terminal may receive the entire signal from the base station in the downlink interval without distinguishing signals transmitted by zones.

Meanwhile, the interval used by the first terminal for transmitting a signal to the second terminal may be reversely used. That is, the first terminal may transmit a signal for the other terminal connected to the second terminal in the access zone of the downlink section of the (i + 1) th frame, and may transmit the signal for the second terminal in the relay zone.

If the first terminal having received the signal from the base station through the access zone and the relay zone does not have data to be transmitted to the second terminal but has only a signal to be transmitted to the other terminal connected to the second terminal, The UE may transmit a signal using only the relay zone of the downlink interval. At this time, if the second terminal receiving the signal from the first terminal is not the information about the other terminal, the signal can be transmitted to the other terminal using only the relay zone.

FIG. 12 is a diagram illustrating a method for transmitting an uplink section according to each application by dividing an uplink section into two areas when a second terminal transmits a signal to a base station through a first terminal in an uplink section.

As shown in FIG. 12, a first terminal that transmits a signal to a base station receives a signal for a corresponding terminal through an access zone in an uplink interval of an i-th frame, and transmits the signal to the base station through a relay zone Signal can be received. Meanwhile, the first terminal may receive the entire signal from the base station in the uplink section without distinguishing signals transmitted by zones.

The first terminal, which has received the signal for the corresponding terminal and the signal to be transmitted to the base station from the second terminal, uses the access zone and the relay zone of the uplink interval of the next frame ((i + 1) th frame) 2 < / RTI > terminal to the first terminal.

In this case, the uplink interval in the (i + 1) th frame is switched from the reception mode to the transmission mode. At this time, it is also possible to use the access zone and the relay zone without distinguishing them.

13 is a diagram illustrating a method of transmitting and receiving data using a frame structure in which downlink and uplink sections are divided into an access zone and a relay zone.

13, when the first terminal receives a signal from the base station in the access zone and relay zone of the downlink section of the i < th > frame, receives the signal from the base station in the access zone of the uplink section of the i & Th frame and transmits a signal to the base station in an access zone and a relay zone of a downlink interval of an (i + 1) th frame, and transmits a signal in an access zone and a relay zone of an uplink interval of an (i + And receives a signal from the second terminal.

Wherein the first terminal operates in a reception mode to receive a signal from the base station in a downlink interval of an i < th > frame, and transmits the received signal to a second terminal in an uplink interval of an i & Can operate.

The first terminal operates in a transmission mode to transmit a signal to the base station in a downlink interval of an (i + 1) th frame and receives a signal from the second terminal in an uplink interval of an (i + 1) And operates in the receive mode.

In this case, according to an embodiment of the present invention, the signal reception from the base station and the signal transmission to the second terminal can be performed in the same frame or in units of several frames. In addition, according to an embodiment of the present invention, the switching of the transmission mode / reception mode or the reception mode / transmission mode in the downlink / uplink section may be performed in units of frames, superframes, Lt; / RTI >

In addition, since the base station or the terminal uses two zones for different purposes, information used for signal transmission in each zone may be different for each zone. The information used for the signal transmission may include a pilot pattern, a reference signal, a control channel (feedback, Hybrid Automatic Repeat Request (HARQ), and a bandwidth request (BR)).

FIGS. 14A and 14B show another embodiment of the present invention, which is a signal transmission / reception method using only a downlink section.

14 (a), a first terminal receives a signal for itself and a signal for a lower terminal through an access zone of the base station. The first terminal may transmit a signal to a lower terminal through a relay zone in a frame at a next frame or a predetermined periodic interval. The second terminal, which has received the signal from the first terminal, can transmit a signal to the lower terminal using the access zone as the base station transmits the signal to the first terminal. For example, the second terminal located at the second hop can transmit a signal to the lower terminal using the same frame structure as the base station.

Referring to FIG. 14 (b), a base station can transmit a signal to a first lower terminal directly using a relay zone. The first terminal receiving the signal may use an access zone to transmit a signal to a lower terminal. In this case, the area for transmitting a signal from the terminal to the other terminal may be composed of one frame, a plurality of frames, one super frame, or a plurality of super frames.

15 (a) and 15 (b) are still another embodiment of the present invention, which is a signal transmission / reception method using only an uplink section.

The signal transmission / reception method of FIG. 15 is the same as the signal transmission / reception method using only the downlink section (FIGS. 14A and 14B) except that only the uplink section is used, and thus a detailed description thereof will be omitted. Referring to FIG. 15, a lower-layer terminal can transmit a signal to an upper-layer terminal or a base station using an access zone or a relay zone, and the terminal, which has received the signal, To the terminal.

The data transmission / reception method of FIGS. 6 to 15 corresponds to a part of the present invention. It is also possible to transmit / receive data by combining some of the signal transmission methods in the downlink / uplink interval .

According to an embodiment of the present invention, the above-described method can be implemented as a computer-readable code on a medium on which a program is recorded. The computer readable medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of the computer-readable medium include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage, and the like, and also implemented in the form of a carrier wave (for example, transmission over the Internet) . Further, the computer may include a control unit of the mobile terminal.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It falls within the scope of the invention.

100: base station
200:
300 (300-a, 300-1, ..., 300-N)

Claims (21)

In a wireless access system, a method for a terminal to perform a relay operation,
Receiving a relay operation trigger signal from a base station;
Transmitting a response signal to the base station;
Receiving a first message including an indicator for instructing the terminal to perform the relay operation and a relay operation parameter from the base station; And
And performing the relay operation between the base station and the second terminal based on the received relay operation parameter,
Wherein the relay operation trigger signal is for requesting terminals in a cell of the base station to provide information to be used by the base station to determine a relay terminal to perform the relay operation among the terminals,
The response signal comprising the information requested by the base station,
Wherein the relay operation parameter is information for instructing a transmission operation or a reception operation in at least one of a downlink section and an uplink section in a frame,
Wherein the first message further comprises switching cycle information for instructing switching of a transmission operation or a reception operation determined by the relay operation parameter on a frame unit or a superframe basis,
Wherein the relay operation parameter indicates a reception operation for data reception from the base station in a downlink interval of a first frame and transmits the data received in the downlink interval of the first frame to the second terminal Instructs a transmission operation in a downlink section of two frames,
Wherein a downlink interval of the first frame and a downlink interval of the second frame are divided into a downlink access zone and a downlink relay zone and a signal to be transmitted to the second terminal is divided into a downlink relay Lt; RTI ID = 0.0 > zone. ≪ / RTI > delete delete 2. The method of claim 1,
In the case of the multi-hop relay, information on a lower layer terminal, information on a switching gap, information on resource allocation, pilot signal information, connection for relaying, And a flow ID for a connection ID and a relay ID for relaying. delete 2. The apparatus of claim 1,
Channel Quality Indicator, Channel State Information, Signal to Interference plus Noise Ratio, Interference Level, Path Loss, and Relaying Support And a Relaying Support Indicator. The method according to claim 1,
Transmitting a link measurement signal to the second terminal;
Receiving link information measured by the link measurement signal from the second terminal;
Setting a link transmission parameter based on the received link information; And
Further comprising transmitting an M2M Relaying Request message to the base station,
Wherein the MRM relaying request message includes an M2M relaying confirm indicator indicating that the UE is ready to perform MRM relaying. The method according to claim 1,
Transmitting a link measurement signal to the second terminal;
Receiving link information measured by the link measurement signal from the second terminal;
Transmitting the received link information to the base station through an M2M Relaying Request message; And
Further comprising receiving an M2M Relaying Response message from the base station,
Wherein the MBMS relay response message includes a link transmission parameter and an MBMS acknowledgment indicator indicating that the UE is ready to perform the MBMS relay. delete delete delete delete delete delete delete delete delete delete In a wireless access system, in a terminal performing a relay operation,
A wireless communication unit for transmitting and receiving a wireless signal to and from the outside; And
And a control unit connected to the wireless communication unit,
The control unit includes:
Controlling the wireless communication unit to receive a relay operation trigger signal from the base station,
Controlling the wireless communication unit to transmit a response signal to the base station,
Controlling the wireless communication unit to receive a first message including an indicator for instructing the terminal to perform the relay operation and a relay operation parameter from the base station,
Controls the wireless communication unit to perform the relay operation between the base station and the second terminal based on the received relay operation parameter,
Wherein the relay operation trigger signal is for requesting terminals in a cell of the base station to provide information to be used by the base station to determine a relay terminal to perform the relay operation among the terminals,
The response signal comprising the information requested by the base station,
The relay operation parameter is information for instructing a transmission operation or a reception operation in at least one of a downlink section and an uplink section in a frame,
Wherein the first message further includes switching cycle information for instructing switching of a transmission operation or a reception operation determined by the relay operation parameter on a frame unit or a superframe basis,
Wherein the relay operation parameter indicates a reception operation for data reception from the base station in a downlink interval of a first frame and transmits the data received in the downlink interval of the first frame to the second terminal A transmission operation is instructed in a downlink section of two frames,
Wherein a downlink interval of the first frame and a downlink interval of the second frame are divided into a downlink access zone and a downlink relay zone and a signal to be transmitted to the second terminal is divided into a downlink relay Lt; RTI ID = 0.0 > zone. ≪ / RTI > 20. The method of claim 19,
Wherein the terminal and the second terminal are M2M (Machine to Machine) terminals. delete

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