KR101636581B1 - Method and apparatus for transmitting ans receiving signal in relay station - Google Patents

Method and apparatus for transmitting ans receiving signal in relay station Download PDF

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KR101636581B1
KR101636581B1 KR1020100031025A KR20100031025A KR101636581B1 KR 101636581 B1 KR101636581 B1 KR 101636581B1 KR 1020100031025 A KR1020100031025 A KR 1020100031025A KR 20100031025 A KR20100031025 A KR 20100031025A KR 101636581 B1 KR101636581 B1 KR 101636581B1
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relay station
frame
zone
signal
base station
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KR1020100031025A
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Korean (ko)
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KR20110031878A (en
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천진영
임동국
조한규
곽진삼
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엘지전자 주식회사
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Priority to CN201080042002.7A priority Critical patent/CN102498678B/en
Priority to PCT/KR2010/006337 priority patent/WO2011034350A2/en
Priority to US12/886,726 priority patent/US8547895B2/en
Publication of KR20110031878A publication Critical patent/KR20110031878A/en
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Abstract

A method of transmitting and receiving signals of a relay station in a wireless communication system including a relay station includes receiving frame setting information for a relay station frame from a base station; A DL downlink access zone for transmitting a signal to a relay station connected to the relay station in a relay station frame according to the frame setting information and a DL relay station zone for receiving a signal from the base station; Comparing a time required for operation switching from the DL access zone to the DL relay station zone and a propagation delay time required to receive a signal from the base station; Setting a partial symbol of the DL access zone or the DL relay station zone as a switching time according to the comparison result; Transmitting a signal from the DL access zone to the relay station; And receiving a signal from the base station in the DL relay station zone.

Figure R1020100031025

Description

TECHNICAL FIELD [0001] The present invention relates to a method and apparatus for transmitting /

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to wireless communication, and more particularly, to a method and apparatus for signal transmission and reception of a relay station.

The Institute of Electrical and Electronics Engineers (IEEE) 802.16e standard is a sixth standard for IMT (International Mobile Telecommunication) -2000 in ITU-R (ITU-R) under ITU (International Telecommunication Union) OFDMA TDD '. ITU-R is preparing the IMT-Advanced system as the next generation 4G mobile communication standard after IMT-2000. The IEEE 802.16 WG (Working Group) decided to implement the IEEE 802.16m project with the goal of preparing the amendment specification of the existing IEEE 802.16e as the standard for the IMT-Advanced system at the end of 2006. As can be seen from the above objectives, the IEEE 802.16m standard contains two aspects: continuity of the past, which is the modification of the IEEE 802.16e standard, and future continuity of the standards for the next generation IMT-Advanced system. Therefore, the IEEE 802.16m standard is required to satisfy all the advanced requirements for the IMT-Advanced system while maintaining compatibility with the Mobile WiMAX system based on the IEEE 802.16e standard.

In the case of a broadband wireless communication system, effective transmission and reception techniques and utilization methods have been proposed to maximize the efficiency of limited radio resources. One of the systems considered in the next generation wireless communication system is an Orthogonal Frequency Division Multiplexing (OFDM) system capable of attenuating the inter-symbol interference (ISI) effect with low complexity. OFDM converts serial data symbols into N parallel data symbols, and transmits the data symbols on N separate subcarriers. The subcarriers maintain orthogonality at the frequency dimension. Each of the orthogonal channels experiences mutually independent frequency selective fading, thereby reducing the complexity at the receiving end and increasing the interval of transmitted symbols, thereby minimizing intersymbol interference.

Orthogonal frequency division multiple access (OFDMA) refers to a multiple access method in which a part of subcarriers available in a system using OFDM as a modulation scheme is independently provided to each user to realize multiple access. OFDMA provides a frequency resource called a subcarrier to each user, and each frequency resource is provided independently to a plurality of users and is not overlapped with each other. Consequently, frequency resources are allocated mutually exclusively for each user. Frequency diversity for multiple users can be obtained through frequency selective scheduling in an OFDMA system and subcarriers can be allocated in various forms according to a permutation scheme for subcarriers. And the efficiency of spatial domain can be improved by spatial multiplexing technique using multiple antennas.

Recently, a wireless communication system including a relay station (RS) is being developed. The relay station extends cell coverage and improves transmission performance. The effect of expanding the cell coverage can be obtained by the base station servicing the terminal located at the coverage boundary of the base station through the relay station. In addition, the relay station can increase the transmission capacity by improving the transmission reliability of signals between the base station and the terminal. Even if the terminal is within the coverage of the base station, the relay station may be used when the terminal is located in the shadow area.

There are two types of relay stations. The first is a transparent relay station (BS) that determines all the information necessary for the relay process, and the relay station simply relays the data transmitted from the base station to the lower relay station or the terminal. Transparent relay stations use the same carrier frequency as superordinate or subordinate stations. The second is a relay station that relays data directly to perform resource allocation, MCS (Modulation and Coding Scheme) level determination, and transmission power control required for the relay process, transparent. The non-transparent relay station may use the same carrier frequency as the upper or lower station and may use a different carrier frequency.

The centralized scheduling mode is a mode in which the base station determines the frequency band allocation of the relay station and the relay station. The distributed scheduling mode is a mode in which the relay station cooperates with the base station to determine frequency band allocation to the relay station. The transparent base station may operate only in a centralized scheduling mode, and the non-transparent base station may operate in a centralized or distributed scheduling mode.

It is possible to use AF (Amplify and Forward) and DF (Decode and Forward) as the relaying method used in the relay station. In the AF scheme, the relay station amplifies the data transmitted from the base station and transmits the amplified data to the terminal. In the DF scheme, a relay station decodes data transmitted from a base station to identify a destination station, re-encodes the decoded data, and relays the data to a lower relay station or a target station.

In a wireless communication system including such a relay station, a new frame structure different from the conventional one is required. The relay station may have the same frequency band to transmit signals to the base station and the same frequency band to receive signals from the relay station. Alternatively, the relay station may have the same frequency band used for receiving the signal from the base station and the same frequency band for transmitting the signal to the relay station. It is difficult for the relay station to simultaneously transmit and receive signals in the same frequency band due to self interference. Therefore, time is required to switch the operation mode between transmission and reception of the signal. In general, it is assumed that the relay station can not transmit or receive signals in the operation mode switching time.

There is a propagation delay time that must be considered in conjunction with the operating mode switching time. The propagation delay time can be regarded as the physical propagation time when a wireless signal is transmitted / received between two communication stations. That is, in a wireless communication system including a relay station, a relay station must communicate with a base station and a terminal according to a timing relationship considering operation mode switching time, propagation delay time, and the like.

A method and an apparatus for transmitting and receiving signals of a relay station in a wireless communication system including a relay station.

According to an aspect of the present invention, there is provided a method of transmitting / receiving a signal of a relay station in a wireless communication system including a relay station, comprising: receiving frame setting information for a relay station frame from a base station; A DL downlink access zone for transmitting a signal to a relay station connected to the relay station in a relay station frame according to the frame setting information and a DL relay station zone for receiving a signal from the base station; Comparing a time required for operation switching from the DL access zone to the DL relay station zone and a propagation delay time required to receive a signal from the base station; Setting a partial symbol of the DL access zone or the DL relay station zone as a switching time according to the comparison result; Transmitting a signal from the DL access zone to the relay station; And receiving a signal from the base station in the DL relay station zone.

According to another aspect of the present invention, there is provided a method of transmitting / receiving a signal of a relay station in a wireless communication system including a relay station, comprising: receiving frame setting information for a relay station frame from a base station; Setting an UL (uplink) access zone for receiving a signal to a relay station connected to the relay station in a relay station frame and a UL relay station zone for transmitting a signal to the base station in accordance with the frame setting information; Receiving a signal from the relay station in the UL access zone; And transmitting a signal from the UL relay station zone to the base station, wherein the UL access zone is transmitted in time alignment with the UL access zone of the base station frame or ahead of the UL access zone of the base station frame by a predetermined time interval .

According to another aspect of the present invention, there is provided a method of transmitting / receiving a signal of a relay station in a wireless communication system including a relay station, comprising: receiving frame setting information for a relay station frame from a base station; A downlink access zone for transmitting a signal to a relay station connected to the relay station in accordance with the frame setting information, a DL relay station zone for receiving a signal from the base station, a UL receiving signal from the relay station connected to the relay station, setting up a frame including an uplink access zone and a UL relay station zone for transmitting a signal to the base station; Setting a switching time in the DL access zone or the UL relay station zone; Transmitting a signal in the DL access zone or the UL relay station zone; And receiving a signal in the DL relay station zone or the UL access zone.

The relay station can perform communication with the base station or the relay station considering the operation switching time between the reception mode and the operation mode and the propagation delay time required when transmitting / receiving the signal. The relay station can be included in the wireless communication system without performing a large change in the frame structure between the existing base station and the macro terminal.

1 shows a wireless communication system including a relay station.
2 shows an example of a superframe structure.
3 shows an example of a TDD frame structure.
4 shows an example of the FDD frame structure.
5 shows an example of a frame structure.
6 shows an example of a frame structure usable in a wireless communication system including a relay station.
FIG. 7 is a conceptual diagram illustrating a frame structure to which a method of transmitting and receiving a signal of a relay station according to an embodiment of the present invention is applied.
8 shows a TDD frame structure.
9 shows an example of a TDD frame structure.
10 shows an FDD downlink frame structure.
11 shows an FDD uplink frame structure.
12 shows an example in which the FDD frame includes a switching time.
13 shows a configuration of a relay station and a base station.

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.

1 shows a wireless communication system including a relay station.

Referring to FIG. 1, a wireless communication system 10 including a relay station includes at least one base station 11 (BS). Each base station 11 provides communication services for a particular geographic area 15, commonly referred to as a cell. The cell can again be divided into multiple regions, each of which is referred to as a sector. One base station may have more than one cell. The base station 11 generally refers to a fixed station that communicates with the terminal 13 and includes an evolved NodeB (eNB), a base transceiver system (BTS), an access point, an access network (AN) ABS (advanced BS) and so on. The base station 11 may perform functions such as connectivity, management, control and resource allocation between the relay station 12 and the terminal 14.

A relay station (RS) 12 is a device for relaying signals between a base station 11 and a terminal 14 and includes a relay node (RN), a repeater, a repeater, an ARS It can be called a term. Any method such as amplify and forward (AF) and decode and forward (DF) may be used as a relaying method used in a relay station, and the technical idea of the present invention is not limited thereto.

The MSs 13 and 14 may be fixed or mobile and may be an AMS (Advanced Mobile Station), a UT (User Terminal), a SS (Subscriber Station), a wireless device, a PDA A wireless modem, a handheld device, an access terminal (AT), user equipment (UE), and the like. Hereinafter, the macro terminal is a terminal that directly communicates with the base station 11, and the relay station terminal refers to a terminal that communicates with the relay station. The macro terminal 13 in the cell of the base station 11 can communicate with the base station 11 via the relay station 12 for the purpose of improving the transmission rate according to the diversity effect.

Hereinafter, downlink (DL) means communication from the base station 11 to the macro terminal 13, and uplink (UL) means communication from the macro terminal 13 to the base station 11 .

2 shows an example of a superframe structure.

A superframe (SF) includes a superframe header (SFH) and four frames (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 the frame may be variously changed according to the channel bandwidth and the length of the cyclic prefix (CP).

The superframe header can carry essential system parameters and system configuration information. The superframe header may be located in the first subframe within the superframe. 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.

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 in a time domain and includes a plurality of subcarriers in a frequency domain. 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 OFDM symbols, but this is only an example and the number of OFDM symbols included in the subframe is not limited. The number of OFDM symbols included in a subframe can be variously changed according to the channel bandwidth and the length of the CP. A type of a subframe can be defined according to the number of OFDM symbols included in the subframe. For example, a Type-1 subframe may be defined to include 6 OFDM symbols, a Type-2 subframe may include 7 OFDM symbols, a Type-3 subframe may include 5 OFDM symbols, and a Type-4 subframe may include 9 OFDM 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 OFDM symbols included in each subframe in one frame may be all the same or different. Alternatively, the number of OFDM symbols in at least one subframe in one frame may be different from the number of OFDM 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 TDD frame are divided into the uplink subframe and the downlink subframe in the time domain. In an FDD FDD frame, each subframe is used for uplink transmission or downlink transmission at different frequencies of the same time. That is, the subframes in the FDD frame 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.

One OFDM 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. The parameters that characterize the OFDM symbol are BW, N used , n, G, and so on. BW is the nominal channel bandwidth. N used is the number of subcarriers used (including DC subcarriers). n is a sampling factor. This parameter is used in conjunction with BW and N used to determine the sub-carrier spacing (spacing) and the effective symbol time (useful symbol time). G is the ratio of CP time to useful time.

Table 1 below shows the OFDMA parameters.

Channel bandwidth, BW (MHz) 5 7 8.75 10 20 Sampling factor, n 28/25 8/7 8/7 28/25 28/25 Sampling frequency, F s (MHz) 5.6 8 10 11.2 22.4 FFT size, N FFT 512 1024 1024 1024 2048 Subcarrier spacing, Δf (kHz) 10.94 7.81 9.77 10.94 10.94 Useful symbol time, T b (μs) 91.4 128 102.4 91.4 91.4 G = 1/8 Symbol time, T s (μs) 102.857 144 115.2 102.857 102.857 FDD Number of
ODFMA symbols
per 5ms frame 48 34 43 48 48 Idle time (μs) 62.857 104 46.40 62.857 62.857 TDD Number of
ODFMA symbols
per 5ms frame 47 33 42 47 47 TTG + RTG (μs) 165.714 248 161.6 165.714 165.714 G = 1/16 Symbol time, T s (μs) 97.143 136 108.8 97.143 97.143 FDD Number of
ODFMA symbols
per 5ms frame 51 36 45 51 51 Idle time (μs) 45.71 104 104 45.71 45.71 TDD Number of
ODFMA symbols
per 5ms frame 50 35 44 50 50 TTG + RTG (μs) 142.853 240 212.8 142.853 142.853 G = 1/4 Symbol time, T s (μs) 114.286 160 128 114.286 114.286 FDD Number of
ODFMA symbols
per 5ms frame 43 31 39 43 43 Idle time (μs) 85.694 40 8 85.694 85.694 TDD Number of
ODFMA symbols
per 5ms frame 42 30 38 42 42 TTG + RTG (μs) 199.98 200 136 199.98 199.98 Number of Guard subcarriers Left 40 80 80 80 160 Right 39 79 79 79 159 Number of used subcarriers 433 865 865 865 1729 Number of PRU in type-1 subframe 24 48 48 48 96

In Table 1, N FFT is the most small 2 n in the water is greater than N used is the least power (Smallest power of two greater than N used), sampling factor F s = floor (n · BW / 8000) , and × 8000, subcarrier spacing Δf = F s / a N FFT, and the effective symbol time T b = 1 / Δf, CP time T g = g · a T b, and OFDMA symbol time T s = T b + T g, the sampling time is T b / N FFT .

3 shows an example of a TDD frame structure. This shows the case where G = 1/8. The 20-ms long superframe consists of four frames (F0, F1, F2, F3) of 5 ms in length. One frame consists of 8 subframes (SF0, SF1, SF2, SF3, SF4, SF5, SF6, SF7), and the ratio of the downlink subframe to the uplink subframe is 5: 3. The TDD frame structure of FIG. 3 can be applied when the bandwidth is 5 Mhz, 10 Mhz, or 20 Mhz. The last downlink subframe SF4 includes five OFDM symbols, and the remaining subframes include six subframes.

4 shows an example of the FDD frame structure. This shows the case where G = 1/8. The 20-ms long superframe consists of four frames (F0, F1, F2, F3) of 5 ms in length. One frame is composed of eight subframes (SF0, SF1, SF2, SF3, SF4, SF5, SF6, SF7), and all subframes include a downlink region and an uplink region. The FDD frame structure of FIG. 4 is applicable when the bandwidth is 5 Mhz, 10 Mhz, or 20 Mhz.

5 shows an example of a frame structure. This shows the case where G = 1/16. The frame structure of Fig. 5 can be applied to both FDD and TDD systems. There are eight subframes (SF0, SF1, SF2, SF3, SF4, SF5, SF6, SF7), and the ratio of the DL subframe and the UL subframe is 5: 3. The frame structure of FIG. 5 is applicable when the bandwidth is 5 Mhz, 10 Mhz, or 20 Mhz. Each subframe may contain six or seven OFDM symbols.

6 shows an example of a frame structure usable in a wireless communication system including a relay station.

In a wireless communication system including a relay station, the relay station can use the same OFDMA parameters as the base station (see Table 1). As shown in FIG. 6, the superframe structure of the base station and the superframe structure of the relay station may be the same. The superframe of the base station and the superframe of the relay station may be time aligned and may include the same number of frames and subframes. All superframes of the relay station include a superframe header and the superframe header transmitted by the relay station may have the same temporal location and format as the superframe header transmitted by the base station. Also, a preamble (e.g., an SA-preamble, a PA-preamble, etc.) transmitted by a relay station may be transmitted in synchronization with a preamble transmitted by a base station.

The relay station needs to transmit its own downlink control information (for example, a preamble or a superframe header (SFH)), and thus needs a radio resource area capable of transmitting a signal to the relay station in the downlink. The relay station receives a signal from the relay station, decodes it, and retransmits the signal to the base station. Therefore, a radio resource area capable of transmitting a signal in the uplink is required. The relay station also transmits signals to or receives signals from the relay station in the same frequency band. Or receives a signal from the relay station terminal or transmits a signal to the base station in the same frequency band. Therefore, the relay station needs an operation switching time for stabilizing the operation in switching the transmission / reception operation of the signal. It is generally assumed that the relay station does not receive or transmit signals at the operation switching time.

Also, the relay station receives a signal transmitted by the base station or the relay station after a transmission delay time. Likewise, the signal transmitted by the relay station is received by the base station or the relay station after the propagation delay time.

That is, the frames applied to the relay station should consider the operation switching time and the propagation delay time. A frame structure and a frame transmission method to be described below may be implemented in a 2-hop relay station (a relay station in a base station-relay station-terminal structure) or a 3-hop relay station (a base station-relay station 1-relay station- The relay station 1 and the relay station 2), and can also be applied to a transparent relay station. In addition, it can be applied not only to distributed scheduling but also to centralized scheduling.

First, terms are defined to clarify the invention.

In the following drawings and description, ABS denotes a base station, ARS denotes a relay station, and AMS denotes a terminal.

RTD (Round Trip Delay) means the round trip delay time between two communication stations. For example, a time required for the base station to receive a signal transmitted by the relay station in the communication between the relay station and the base station, which is an upper station of the relay station, and a time required for the relay station to receive the signal transmitted by the base station. From the perspective of the relay station, the RTD may have round trip delay time in communication with the base station and round trip delay time in communication with the relay station. RTD is indicated as ARSRTD for the relay station, ABSRTD for the base station and AMSRTD for the terminal. Thus, a 1/2 RTD can mean the propagation delay time from one station to the other.

The Transmit / Receive Transition Gap (TTG) means a minimum value of a required time interval between a signal transmission time point and a signal reception time point when a signal is transmitted in a frame. ARSTTG denotes a TTG in a relay station frame, and ABSTTG denotes a TTG in a base station frame (ABSTTG is simply referred to as TTG in the following drawings). For example, ARSTTG may be measured in time intervals from the last sample time of the transmission burst at the antenna port of the relay station to the first sample time of the reception burst. ABSTTG may be longer than one symbol.

A Receive / Transition Transition Gap (RTG) is a minimum value of a required time interval between a reception time of a signal and a transmission time of a signal when a signal is received and transmitted within the frame. ARSRTG denotes an RTG in a relay station frame, and ABSRTG denotes an RTG in a base station frame (ABSRTG is simply referred to as RTG in the following drawings). For example, ARSRTG may be measured in time intervals from the last sample time of the received burst at the antenna port of the relay station to the first sample time of the transmission burst.

The idle time is a time for preventing inter-symbol interference, and may be included in the TTG or the RTG, or may be given as a separate time. When the base station frame is an FDD frame, an idle time interval is included between base station frames. This idle time is indicated by IdleTime. When the RS frame is an FDD frame, idle time intervals are included between relay station frames. This idle time is denoted by R_IdleTime. In the FDD DL frame of the relay station, R_IdleTime may be equal to IdleTime. The R_IdleTime in the FDD UL frame of the relay station may be equal to or less than IdleTime.

The following table is an example of symbol length, TTG / RTG, and idle time according to bandwidth and CP length.

BW 5/10 / 20MHz 7MHz 8.75 MHz 1/8 CP OFDM symbol time 102.857us 144us 115.2us TTG / RTG in TDD mode 105.714 / 60us 180 / 60us 138.4 / 74.4us Idle Time in FDD mode 62.857us 104us 46.4us 1/16 CP OFDM symbol time 97.143us 136us 108.8us TTG / RTG in TDD mode 82.853 / 60us 188 / 60us 87.2 / 74us Idle Time in FDD mode 45.71us 104us 104us 1/4 CP OFDM symbol time 114.286us 160us 128us TTG / RTG in TDD mode 139.988 / 60us 140 / 60us TBD Idle Time in FDD mode 85.694us 40us 8us

If the cell coverage of the base station is 5 km, RTD may be 33.3 us, RTD / 2 16.7 us, and ARSTTG or ARSRTG 50 us.

In a wireless communication system including a relay station, a base station frame can be divided into an access zone and a relay station zone. Within the base station frame, the access zone is located before the relay station zone. The access zone duration and the relay station zone duration may be different in the uplink and the downlink. The base station can inform the relay station of the zone setting of the access zone and the relay station zone.

The base station frame may include a DL access zone and a DL transmission zone. A DL access zone refers to a radio resource area in which a base station transmits a signal to a macro terminal. A DL transmission zone refers to a radio resource area in which a BS transmits a signal to a relay station and / or a MAC terminal. The base station frame may also include a UL access zone and a UL receiving zone. The UL access zone refers to a radio resource area in which a base station receives a signal from a macro terminal. The UL receive zone refers to a radio resource region in which a base station receives a signal from a macro terminal and / or a relay station.

The relay station frame may include a DL access zone, a DL reception zone, a UL access zone, and a UL transmission zone. The DL access zone refers to a radio resource area in which a relay station transmits a signal to a relay station. The DL receiving zone refers to a radio resource area in which a relay station receives a signal from a base station. The UL access zone refers to a radio resource area in which the relay station receives a signal from the relay station, and the UL transmission zone refers to a radio resource area in which the relay station transmits a signal to the base station.

In the following drawings, a DL reception zone or a DL transmission zone may be referred to as a DL relay zone. The UL transmission zone or the UL reception zone may be referred to as a UL relay zone. The positions of the DL relay station zone and the UL relay station zone can be indicated to the terminal by the base station or the relay station. The relay station may continue the long TTI allocation over the access zone or the relay station zone in the downlink or uplink.

Now, a method of transmitting and receiving signals of a relay station will be described using the above-mentioned terminology.

The relay station receives the frame setting information for the relay station frame from the base station, and sets the relay station frame according to the frame setting information. The frame setting information may include a radio resource area for communicating with the relay station in the relay station frame, and information indicating a radio resource area for communicating with the base station. Also, the frame setting information may include information on the type of frame and the OFDMA parameter. The base station can transmit frame setting information in the downlink control information. For example, the frame configuration information may be included in the superframe header and broadcast or multicast. In this case, the frame setting information can be applied to a plurality of frames. A signal transmission / reception method of a relay station using a relay station frame set according to frame setting information will be described later in detail. The relay station transmits or receives signals to the relay station or the base station according to the established relay station frame structure.

FIG. 7 is a conceptual diagram illustrating a frame structure to which a method of transmitting and receiving a signal of a relay station according to an embodiment of the present invention is applied.

Assume that a base station and a relay station time-align and transmit a signal between a base station frame and a relay station frame. The relay station frame structure in this case is referred to as a time alignment frame. It is also assumed that ARSRTD and AMSRTD are the same for convenience.

The base station transmits a signal to the macro terminal in the DL access zone, and the relay station transmits a signal from the DL access zone to the relay station. It is assumed that the propagation delay time for the macro terminal and the relay station terminal to receive signals is the same for convenience. Then, the macro terminal and the relay station terminal receive the signal after 1/2 AMSRTD (Advanced Mobile Station round trip delay).

After the relay station transmits a signal to the relay station in the DL access zone of the relay station frame, the relay station receives the signal from the base station in the DL reception zone (DL relay station zone of the relay station frame). At this time, the relay station receives the signal transmitted from the DL relay station zone of the base station frame in the DL relay station zone of the relay station frame after 1/2 ARSRTD (advanced relay station round trip delay). The relay station performs the operation mode switching from the transmission mode (DL access zone) to the reception mode (DL relay station zone), and the relay station requires time equivalent to ARSTTG for switching the operation mode.

If 1/2 ARSRTD is greater than or equal to ARSTTG, the relay station does not have any problem in receiving the signal transmitted by the base station. On the other hand, if 1/2 ARSRTD is smaller than ARSTTG, the relay station may have trouble receiving the signal transmitted by the base station. That is, it may happen that a signal transmitted from the base station must be received in the operation mode switching process. Therefore, in this case, for example, all or a part of the first symbol of the relay station zone DL relay station zone may be set as a switching time and no signal may be received. In this case, the switching time can be referred to as R-TTI (Relay Transmit to Receive Transition Interval). The term R-TTI is used to indicate the time required for an operation in which a relay station transmits a signal to a relay station and receives a signal from the base station. The switching time is indicated by (c) and (710) in Fig. The area indicated by the switching time can be expressed as max (1/2 ARSRTD, ARSTTG) -1 / 2ARSRTD in the time domain and can be from 0 to a maximum of one symbol. That is, the R-TTI may or may not be necessary.

Although not shown in Fig. 7, the switching time may be included in the DL access zone of the relay station frame. For example, the last symbol of the DL access zone can be used as the switching time. Then, the relay station can transmit a signal to the relay station using symbols other than the last symbol in the DL access zone.

If the relay station transmits a DL access zone ahead of the base station's DL access zone by time equal to or greater than max (1/2 ARSRTD. ARSTTG) without time alignment, switching from the relay station frame to the DL access zone and the DL relay station zone It is possible to prevent a separate symbol from being used for the time. When relay station frames are shifted in time, such relay station frames are referred to as time-shifted frames. A method of transmitting and receiving a signal of a relay station using a time-shifted frame and a time-aligned frame will be described later in detail.

The relay station receives a signal from the relay station in the UL access zone located after the DL relay station zone of the relay station frame. In this case, since the relay station continues to operate in the reception mode (DL relay station zone) to the reception mode (UL access zone), the operation mode switching time may not be required. Therefore, the UL access zone can be located continuously in the DL relay station zone. This is represented by option 1 in FIG.

Assume that option 1 is applied. That is, when the UL access zone is located consecutively in the DL relay station zone, the relay station receiving the service of the relay station should transmit a signal before 1/2 AMSRTD based on the UL access zone. Then, the DL access station zone of the relay station and the UL access zone of the relay station terminal overlap, and they may interfere with each other.

After the relay station receives the signal in the UL access zone, the time of the ARSRTG is required to transmit the signal from the UL relay station zone to the base station. When the relay station transmits a signal in the UL relay station zone of the relay station frame, the base station receives it after 1/2 ARSRTD. Therefore, the time required between the DL frame region and the UL frame region in the base station is 1/2 ARSRTD + ARSRTG + 1/2 ARSRTD = ARSRTD + ARSRTG.

The UL access zone in the relay station frame may be set to receive after a time equal to or greater than 1/2 AMSRTD with respect to the DL relay station zone. This is represented by option 2 in FIG. In Option 2, the relay station terminal can transmit a signal after a time equal to or greater than 1/2 AMSRTD compared to Option 1 in the UL access zone. The relay station needs time of ARSRTG to transmit the signal in the UL relay station zone after receiving the signal in the UL access zone. If the time interval between the UL access zone and the UL relay station zone is greater than or equal to the ARSRTG, the relay station does not have any problem in receiving the signal transmitted by the relay station. On the other hand, if the time interval between the UL access zone and the UL relay station zone is smaller than the ARSRTG, the relay station may receive a signal transmitted by the relay station. That is, the relay station may receive a signal transmitted in the operation mode switching process. Therefore, in this case, for example, all or a part of the last symbol of the relay station frame UL access zone may be set as a switching time and no signal may be received. In this case, the switching time can be referred to as R-RTI (Relay Receive to Transmit Transition Interval). The term R-RTI is used to indicate the time required for the RS to receive a signal from the RS and transmit the signal to the BS. This switching time is indicated by (R) (711) in FIG. The area represented by the transition time may be greater than or equal to 1/2 AMSRTD in the time domain and may be a maximum of one symbol.

When the relay station transmits a signal in the UL relay station zone, the base station receives after 1/2 ARSRTD. Therefore, the time required between the DL frame region and the UL frame region in the base station position is 1/2 ARSRTD + 1/2 AMSRTD + ARSRTG + 1/2 ARSRTD for Option 2.

When the time required between the DL frame region and the UL frame region is greater than the TTG of the base station frame in the options 1 and 2 described above, the RS needs to use some symbols for the switching time.

8 shows a TDD frame structure.

In FIG. 8, it is assumed that the propagation delay time of all the stations is equal to 1/2 RTD for convenience. Then, if ARSTTG is less than or equal to 1/2 RTD, the RS downlink frame structure is the same as the downlink frame structure of the BS. On the other hand, if ARSTTG is greater than 1/2 RTD, there are two options. First, some symbols may be used as the switching time in the DL subframe of the relay station frame. The symbol used as the transition time can be used for the time interval of (ARSTTG - 1/2 RTD).

Second, if (RTG + 1/2 RTD) is longer than (ARSTTG - 1/2 RTD), the DL access zone of the relay station frame is transmitted earlier than the DL access zone of the base station frame by (ARSTTG - 1/2 RTD) will be. That is, a time-shifted frame structure is used. Here, the RTG is located between the UL relay station zone of the base station frame (n-1) and the DL access zone of the base station frame n. If the value of (RTG + 1/2 RTD) is greater than (ARSTTG - 1/2 RTD), the relay station does not affect the synchronization between frames even if the relay station shifts the DL access zone forward by (ARSTTG - 1/2 RTD) . In general, ARSTTG is longer than 1/2 RTD. Also, in most frame structures (RTG + 1/2 RTD) is longer than (ARSTTG - 1/2 RTD).

(ARSRTG + RTD) is less than or equal to TTG, the UL access zone of the relay station can be received after 1/2 RTD elapses after reception of the DL relay station zone. If (ARSRTG + RTD) is greater than the TTG, the UL access zone may receive after a lapse of 1/2 RTD after receiving the DL relay station zone, but may use some symbols of the UL access zone for the switching time. The time required for the conversion time can be expressed as (TTG - ARSRTG - RTD), and one symbol can be used. In general, assuming a serving base station with 5km cell coverage, ARSRTG + RTD is less than TTG (in most cases except for 1/16 CP at 5, 10, 20 MHz). In most cases (1/2 RTD + Idle Time) is larger than (ARSTTG - 1/2 RTD) except for 8.75 MHz, 1/4 CP.

In the above description, the switching time, that is, the R-TTI or the R-RTI, can be expressed by the following expressions. First, the relay station TDD frame will be described.

The Relay Station to Receive Transition Interval (R-TTI) is allocated to the DL Access Zone or the DL Relay Station Zone in the downlink, and the Relay Receive to Transmit Transition Interval (R-RTI) . R-TTI and R-RTI may be used to adjust the timing of the frame considering the TTG and the RTD between the relay station and the upper station. R-TTI and R-RTI may be 0 or have a maximum value of one symbol.

When the relay station performs operation switching from the transmission mode to the reception mode, the last symbol of the relay station frame DL access zone or the first symbol of the DL relay station zone can be used as the R-TTI. In this case, the symbol time is based on the base station frame. R-TTI can be calculated by the following equation (in the following equations, RSTTG denotes ARSTTG, RSRTG denotes ARSRTG, and R_RTD denotes ARSRTD).

Figure 112010021636913-pat00001

In Equation (1) and the following equations, T s represents an OFDMA symbol time.

Time-shifted UL frame structure

The relay station UL frame may be shifted forward in time than the base station UL frame. This frame structure is referred to as a time-shifted UL frame structure. Assuming that the time at which the relay station UL frame precedes the base station UL frame is T adv , T adv can be given, for example, TTG - R_IdleTime. R_IdleTime is an idle time interval between the DL relay station zone and the UL access zone in the relay station frame. R_IdleTime may be a value equal to or less than TTG. That is, the time-shifted UL frame structure can be applied when R_IdleTime is smaller than TTG.

In the time-shifted UL frame structure, when the relay station performs operation switching from the reception mode to the transmission mode, the last symbol of the relay station frame UL access zone or the first symbol of the UL relay station zone may be used as the R-RTI. R-RTI can be used to match RSRTG and R_RTD between the relay station and the upper station. In this case, the symbol time is based on the base station frame. RTI ID = 0.0 > R-RTI < / RTI >

Figure 112010021636913-pat00002

Where R_RTD is the round trip delay time between the relay station and the upper station, i.e., the base station. R_IdleTime is equal to or greater than M_RTD / 2. Here, M_RTD is the round-trip delay time between the UE and the upper station, for example, the relay station. If R_IdleTime is equal to TTG, R-RTI may be the same as one OFDMA symbol.

Time alignment UL frame structure

The relay station UL frame may be transmitted in time alignment with the base station UL frame. This frame structure is referred to as a time alignment UL frame structure.

In a time-aligned UL frame structure, when the relay station performs operation switching from the reception mode to the transmission mode, the last symbol of the relay station frame UL access zone or the first symbol of the UL relay station zone may be used as the R-RTI. R-RTI can be used to match the RSRTG and R_RTD between the relay station and the upper station.

9 shows an example of a TDD frame structure.

Referring to FIG. 9, the ratio of the DL subframe to the UL subframe is 5: 3. This TDD frame structure can be applied to, for example, any one of channel bandwidths 5, 10, and 20 MHz, G = 1/8. The number of subframes allocated to the relay station zone in the downlink is two, and the number of the subframes allocated to the relay station zone in the uplink is one.

In the relay station TDD frame, a Relay Transmit to Receive Transition Interval (R-TTI) may be included in the DL access zone and a Relay Receive to Transmit Transition Interval (R-RTI) may be included in the UL access zone in the uplink.

10 shows an FDD downlink frame structure.

Assume that the relay station uses a relay station frame with time alignment with the base station frame as shown in FIG. If ARSTTG is less than or equal to 1/2 RTD, the DL frame structure of the relay station can be used in the same manner as the DL frame structure of the base station.

If ARSTTG is greater than 1/2 RTD, some symbol of the relay station DL subframe may be used as the switching time. The transition time can be up to one symbol in time, including (ARSTTG-1/2 RTD). For example, when a relay station receives a signal from a base station in a DL subframe 4, the relay station operates in a transmission mode in the DL subframe 3 and operates in a reception mode in the DL subframe 4, ARSTTG is required between 4 and 4. Then, the relay station receives the signal transmitted in the DL subframe 4 of the base station frame after 1/2 RTD. Therefore, if ARSTTG is greater than 1/2 RTD, (ARSTTG - 1/2 RTD) time is required as the switching time. A maximum of one symbol can be used if the conversion time is included in symbol units. In other words, ARSTTG time is required between DL subframe 3 and DL subframe 4 in the relay station frame. If the time of ARSTTG is less than or equal to 1/2 RTD, it is not a problem. If the time of ARSTTG is 1/2 RTD , Then some of the symbols of the DL subframe 3 or the DL subframe 4 are eventually used as the switching times.

If (1/2 RTD + IdleTime) is longer than (ARSTTG - 1/2 RTD), the relay station does not time align the transmission of the DL access zone with the transmission of the base station's DL access zone (ARSTTG - 1/2 RTD) As shown in FIG. Otherwise, some symbols between the DL relay station zone and the DL access zone of the next frame can be used as the switching time.

In general, ARSTTG is longer than 1 / 2RTD. And (RTD + IdleTime) is longer than (ARSTTG - 1/2 RTD) in most frame settings except 8.75MHz, 1/4 CP.

The switching time, i.e., R-TTI or R-RTI, with respect to the FDD downlink frame of the relay station is expressed by a definite formula as follows.

When the relay station performs operation switching from the transmission mode to the reception mode, the last symbol of the relay station frame DL access zone or the first symbol of the UL relay station zone may be used as the R-TTI. The R-TTI can be used to match ARSTTG and R_RTD between the relay station and the upper station. In this case, the symbol time is based on the base station frame. R-TTI can be calculated by the following equation.

Figure 112010021636913-pat00003

When the relay station performs the operation switching from the reception mode to the transmission mode (the last symbol of the relay station frame DL relay station zone and the IdleTime) or (the first symbol of IdleTime and the next frame DL access zone), R-RTI may be used. Or IdleTime may be used as R-RTI. That is, the R-RTI can be calculated by the following equation.

Figure 112010021636913-pat00004

11 shows an FDD uplink frame structure.

11, if the IdleTime is equal to or greater than (ARSRTG + ARSTTG), then the UL access zone of the relay station is compared with the UL access zone of the base station by ARSRTG Lt; / RTI >

11, if the relay station uses time-aligned relay station frames with time alignment with the base station frame, but IdleTime is smaller than (ARSRTG + ARSTTG), then some symbols in the UL subframe of the relay station frame are not converted . For example, one symbol of the UL subframe may be split and used at two transition times. One switching time may be used between the UL access zone and the UL relay station zone of the relay station frame for ARSRTG and the remaining switching time may be used between the UL relay station zone and the UL access zone of the relay station frame for ARSTTG.

The switching time, i.e., R-TTI or R-RTI, with respect to the FDD uplink frame of the relay station is expressed as a definite equation as follows.

Time-shifted UL frame structure

The relay station UL frame may be a time-shifted UL frame shifted in time ahead of the base station UL frame. Assuming that the time at which the relay station UL frame precedes the base station UL frame is T adv , then T adv is not zero. T adv can be given, for example, as IdleTime - R_IdleTime.

(The last symbol of the relay station frame UL access zone + IdleTime) or (the first symbol of the UL relay station zone + IdleTime) when the relay station performs the operation switching from the reception mode to the transmission mode or from the transmission mode to the reception mode in the time- RTI ID = 0.0 > R-RTI < / RTI > and R-TTI. R-TTI or R-RTI can be commonly calculated by the following equation.

Figure 112010021636913-pat00005

Time alignment UL frame structure

The relay station UL frame may be transmitted in time alignment with the base station UL frame. That is, this frame structure is referred to as a time-aligned UL frame structure. That is, T adv is 0.

In a time-aligned UL frame structure, when the relay station performs operation switching from the reception mode to the transmission mode, the last symbol of the relay station frame UL access zone or the first symbol of the UL relay station zone may be used as the R-RTI. When the relay station performs the operation switching from the transmission mode to the reception mode, the last symbol of the UL relay station zone can be used as the R-TTI if RSTTG is larger than (R_RTD / 2 + IdleTime).

12 shows an example of including the switching time in the FDD frame.

12, an R-TTI is included in the last symbol of the DL access zone and an R-RTI is included in the last symbol of the DL relay station zone and the IdleTIME in the case of the FDD downlink frame among the relay station frames. In the case of an FDD uplink frame among relay station frames, R-RTI is included in the first symbol of the UL relay station zone, and R-TTI is included in the last symbol of the UL relay station zone and IdleTIME.

As described above, the RS compares the transmission mode such as RSTTG and RSRTG with the reception mode switching time, the transmission delay time, IdleTime, and R_IdleTime to determine whether the RS frame is a TDD frame or an FDD frame, -RTI. ≪ / RTI > therefore. According to the present invention, it is possible to perform communication by including a relay station in a wireless communication system without significantly changing a frame structure between an existing base station and a macro terminal.

13 shows a configuration of a relay station and a base station.

The base station 500 includes a processor 510, a memory 530, and an RF unit (radio frequency unit) 520. The processor 510 allocates radio resources to the relay station and performs scheduling to receive signals from the relay station. The procedures, techniques, and functions performed by the base station in the above embodiments may be implemented by the processor 510. [ The memory 530 is coupled to the processor 510 and stores various information for driving the processor 510. [ The RF unit 520 is connected to the processor 510 to transmit and / or receive a radio signal. The base station may be a source station or a destination station.

The relay station 600 includes a processor 610, a memory 620, and an RF unit 630. The procedures, techniques, and functions performed by the relay station among the above-described embodiments may be implemented by the processor 610. [ The memory 620 is coupled to the processor 610 and stores various information for driving the processor 610. [ The RF unit 630 is coupled to the processor 610 to transmit and / or receive wireless signals.

Processors 510 and 610 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices. Memory 520,620 may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage media, and / or other storage devices. The RF units 530 and 630 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 may be stored in memory 520,620 and executed by processors 510,610. The memories 520 and 620 may be internal or external to the processors 510 and 610 and may be coupled to the processors 510 and 610 in various well known ways.

The present invention may be implemented in hardware, software, or a combination thereof. (DSP), a programmable logic device (PLD), a field programmable gate array (FPGA), a processor, a controller, a microprocessor, and the like, which are designed to perform the above- , Other electronic units, or a combination thereof. In software implementation, it may be implemented as a module that performs the above-described functions. The software may be stored in a memory unit and executed by a processor. The memory unit or processor may employ various means well known to those skilled in the art.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. It will be understood that various modifications and changes may be made without departing from the spirit and scope of the invention. Accordingly, modifications of the embodiments of the present invention will not depart from the scope of the present invention.

Claims (18)

A method of transmitting and receiving signals of a relay station in a wireless communication system including a relay station,
Receiving frame setup information for a relay station frame from a base station;
A DL downlink access zone for transmitting a signal to a relay station connected to the relay station in a relay station frame according to the frame setting information and a DL relay station zone for receiving a signal from the base station;
Transmitting a signal from the DL access zone to the relay station; And
And receiving a signal from the base station in the DL relay station zone,
The first switching time (R-TTI) is located in the last orthogonal frequency division multiplexing (OFDM) symbol of the DL access zone,
A time required for the RS to perform an operation switching from a transmission state to a reception state is RSTTG, a round trip delay time between the relay station and the base station is R_RTD, Ts Indicates a symbol time, the duration of the R-TTI is expressed by the following equation:
Figure 112016005862035-pat00024

Lt; / RTI >
Wherein the second switching time (R-RTI) is located in the last OFDM symbol of the DL relay station zone when the relay station performs operation switching from the reception state to the transmission state. 2. The method of claim 1, wherein the RS frame is a frequency division duplex (FDD) downlink frame. The method according to claim 1,
Wherein the R-RTI interval is determined based on a time (RSRTG) required for the RS to perform an operation switching from a reception state to a transmission state, an R_RTD, and an idle time of a base station frame. Transmitting / receiving method. delete delete A method of transmitting and receiving signals of a relay station in a wireless communication system including a relay station,
Receiving frame setup information for a relay station frame from a base station;
Setting an UL (uplink) access zone for receiving a signal from a relay station connected to the relay station in a relay station frame and a UL relay station zone for transmitting a signal to the base station in accordance with the frame setting information;
Receiving a signal from the relay station in the UL access zone; And
(R-RTI) is transmitted to a first OFDM (R-RTI) terminal of the UL relay station zone when the relay station performs an operation switching from a reception state to a transmission state, orthogonal frequency division multiplexing (OFDM) symbol,
Wherein the second switching time (R-TTI) is located in the last OFDM symbol of the UL relay station zone when the relay station performs operation switching from the transmission state to the reception state. 7. The method of claim 6, wherein the RS frame is a frequency division duplex (FDD) uplink frame. delete delete delete delete A method of transmitting and receiving signals of a relay station in a wireless communication system including a relay station,
Receiving frame setup information for a relay station frame from a base station;
A downlink access zone for transmitting a signal to a relay station connected to the relay station according to the frame setting information, a DL relay station zone for receiving a signal from the base station, a UL setting up a frame including an uplink access zone and a UL relay station zone for transmitting a signal to the base station;
Transmitting a signal from the DL access zone to the relay station;
Receiving a signal from the base station in the DL relay station zone;
Receiving a signal from the relay station in the UL access zone; And
And transmitting a signal from the UL relay station zone to the base station,
The first switching time (R-TTI) is located in the last orthogonal frequency division multiplexing (OFDM) symbol of the DL access zone,
A time required for the RS to perform an operation switching from a transmission state to a reception state is RSTTG, a round trip delay time between the relay station and the base station is R_RTD, Ts Indicates a symbol time, the duration of the R-TTI is expressed by the following equation:
Figure 112016005862035-pat00025

Lt; / RTI >
RTI ID = 0.0 > (R-RTI) < / RTI > is located in the first OFDM symbol of the UL relay station zone and the R-RTI interval is determined to be 0 or one orthogonal frequency division duplex / RTI > 13. The method of claim 12, wherein the RS frame is a TDD frame. delete delete An RF unit for transmitting and receiving a radio signal; And
And a processor coupled to the RF unit,
The processor comprising: receiving frame setup information for a relay station frame from a base station;
A DL downlink access zone for transmitting a signal to a relay station connected to the relay station in a relay station frame according to the frame setting information and a DL relay station zone for receiving a signal from the base station;
Transmitting a signal from the DL access zone to the relay station; And
And receiving a signal from the base station in the DL relay station zone,
The first switching time (R-TTI) is located in the last orthogonal frequency division multiplexing (OFDM) symbol of the DL access zone,
A time required for the RS to perform an operation switching from a transmission state to a reception state is RSTTG, a round trip delay time between the relay station and the base station is R_RTD, Ts Indicates a symbol time, the duration of the R-TTI is expressed by the following equation:
Figure 112016005862035-pat00026

Lt; / RTI >
RTI ID = 0.0 > (R-RTI) < / RTI > is located in the last OFDM symbol of the DL relay station zone when the relay station performs operation switching from the reception state to the transmission state. An RF unit for transmitting and receiving a radio signal; And
And a processor coupled to the RF unit,
The processor comprising: receiving frame setup information for a relay station frame from a base station;
Setting an UL (uplink) access zone for receiving a signal from a relay station connected to the relay station in a relay station frame and a UL relay station zone for transmitting a signal to the base station in accordance with the frame setting information;
Receiving a signal from the relay station in the UL access zone; And
(R-RTI) is transmitted to a first OFDM (R-RTI) terminal of the UL relay station zone when the relay station performs an operation switching from a reception state to a transmission state, orthogonal frequency division multiplexing (OFDM) symbol,
And the second switching time (R-TTI) is located in the last OFDM symbol of the UL relay station zone when the relay station performs the operation switching from the transmission state to the reception state. An RF unit for transmitting and receiving a radio signal; And
And a processor coupled to the RF unit,
The processor comprising: receiving frame setup information for a relay station frame from a base station;
A downlink access zone for transmitting a signal to a relay station connected to the relay station according to the frame setting information, a DL relay station zone for receiving a signal from the base station, a UL setting up a frame including an uplink access zone and a UL relay station zone for transmitting a signal to the base station;
Transmitting a signal from the DL access zone to the relay station;
Receiving a signal from the base station in the DL relay station zone;
Receiving a signal from the relay station in the UL access zone; And
And transmitting a signal from the UL relay station zone to the base station,
The first switching time (R-TTI) is located in the last orthogonal frequency division multiplexing (OFDM) symbol of the DL access zone,
A time required for the RS to perform an operation switching from a transmission state to a reception state is RSTTG, a round trip delay time between the relay station and the base station is R_RTD, Ts Indicates a symbol time, the duration of the R-TTI is expressed by the following equation:
Figure 112016005862035-pat00027

Lt; / RTI >
RTI ID = 0.0 > (R-RTI) < / RTI > is located in the first OFDM symbol of the UL relay station zone and the R-RTI interval is determined to be 0 or one orthogonal frequency division duplex (OFDM) symbol time.
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