KR101625060B1 - Method and apparatus for communication for relay node and user equipment in wireless communication system - Google Patents

Abstract

The present invention relates to a wireless communication system, and a communication method and apparatus for a repeater and a terminal of a wireless communication system are disclosed. A method for performing downlink communication with a base station (eNB) and a terminal (UE) in a repeater (RN) according to an embodiment of the present invention includes the steps of: one or more of an access control channel and a reference signal from the first i symbols of a first slot of an access downlink subframe from the repeater to the terminal corresponding to i (i? 1) (J + 1) th symbol of the backhaul downlink subframe to the i + jth symbol of the first slot of the backhaul downlink subframe, and performs switching between transmission and reception of the repeater on a predetermined time interval And transmitting the uplink control information to the base station in an interval from the i + j + 1th symbol of the first slot of the backhaul downlink subframe to the last symbol of the second slot of the backhaul downlink subframe, From access over a downlink sub-frame that follows the steps and, the backhaul downlink subframe for receiving a backhaul downlink signal may comprise the step of transmitting the access downlink signal to the mobile station.

Description

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

Hereinafter, a wireless communication system will be described. A communication method and apparatus for a repeater and a terminal of a wireless communication system will be described in detail.

Figure 1 illustrates one or more Relay Nodes (RN) within a base station (eNodeB) region in a wireless communication system. The repeater may transmit the data received from the base station to a user equipment (UE) in the repeater area, and may transmit the data received from the repeater area to the base station. The repeater may also support extending the high data rate area, increasing the quality of the communication at the cell edge, and providing communication in areas outside the building or beyond the base station service area. 1, there is a terminal (hereinafter, referred to as RN-UE) receiving a service from a repeater, such as UE1 to UE3, and a terminal (hereinafter referred to as eNB-UE) have.

2 shows a link between a base station, a repeater and a terminal. The repeater may be wirelessly connected to the base station through the Un interface, and the wireless link between the base station and the repeater may be referred to as a backhaul link. The link from the base station to the repeater may be referred to as a backhaul downlink, and the link from the repeater to the base station may be referred to as a backhaul uplink. Also, the repeater may be wirelessly connected to the terminal through the Uu interface, and the wireless link between the repeater and the terminal may be referred to as an access link. The link from the repeater to the terminal may be referred to as an access downlink, and the link from the terminal to the repeater may be referred to as an access uplink. Quot; in-band "when the backhaul link operates in the same frequency band as the access link, and" out-band " when the backhaul link and the access link operate in different frequency bands. "

The base station requires only the downlink transmission and the uplink reception function and only the uplink transmission and the downlink reception function are required for the terminal, the repeater performs the downlink transmission, the downlink reception, the uplink transmission, All functions are required.

In the case of an in-band repeater, for example, when a backhaul downlink reception from a base station and a downlink transmission to an access terminal are simultaneously performed in a predetermined frequency band, a transmission signal from the transmission terminal of the repeater is received Signal interference may occur at the RF front-end of the repeater. Similarly, if reception of an access uplink from a terminal in a predetermined frequency band and transmission of a backhaul uplink to a base station are simultaneously performed, signal interference may occur at the front end of the repeater.

In order to avoid such signal interference, it is required that the repeater does not simultaneously transmit and receive in the same frequency band. In order to satisfy such a demand, for example, in a repeater, a time division multiplexing (TDMA) is repeatedly performed to receive a backhaul downlink for a predetermined time interval in a predetermined frequency band, and to transmit an access downlink for the next time interval (TDM) scheme can be used. Such a repeater corresponds to a half-duplex repeater.

In the case where a repeater for performing transmission and reception between the backhaul link and the access link is introduced, a repeater transmitting and receiving method is required to enable the terminal supporting the existing network system standard to be supported without changing the subframe structure of the access link .

According to an aspect of the present invention, there is provided a method for performing downlink communication with a base station (eNB) and a terminal (UE) in a RN according to an embodiment of the present invention includes: (I > = 1) symbols of the first slot of the subframe, the first i symbols of the first slot of the access downlink subframe from the repeater to the terminal, (J + 1) th symbol in the first slot of the backhaul downlink sub-frame, and transmitting the at least one of the i + J + 1 < th > symbol of the first slot of the backhaul downlink subframe to the first slot of the second slot of the backhaul downlink subframe, Receiving a backhaul downlink signal from the base station in a period up to a time slot of the uplink and downlink subframes and transmitting an access downlink signal to the terminal through an access downlink subframe following the backhaul downlink subframe; have.

Also, the first i symbols of the first slot of the backhaul downlink subframe may be set to a no hearing zone that does not receive the backhaul downlink signal from the base station.

Also, the repeater may be a half-duplex repeater that alternately performs reception of a backhaul downlink signal and transmission of an access downlink signal.

In addition, the timing of transmitting the access downlink sub-frame in the repeater may be shifted by a predetermined timing offset as compared with the timing of receiving the backhaul downlink sub-frame in the repeater.

According to another aspect of the present invention, there is provided a method for performing uplink communication with a base station (eNB) and a mobile station (UE) in a RN according to another embodiment of the present invention includes: (I > = 1) of the first slot of the backhaul uplink subframe from the repeater to the base station following the access uplink subframe, The method comprising the steps of: switching between transmission and reception of the repeater in an arbitrary time interval; and performing the switching between the i + 1th symbol of the first slot of the backhaul uplink subframe and the last symbol of the second slot of the backhaul uplink subframe And transmitting the backhaul uplink signal to the base station in the interval.

The repeater may be a half-duplex repeater that alternately performs transmission of a backhaul uplink signal and reception of an access uplink signal.

The timing of the access uplink subframe in the repeater may be shifted by a predetermined timing offset compared to the timing of transmitting the backhaul uplink subframe in the repeater.

According to another aspect of the present invention, there is provided a repeater (RN) for communicating with a base station (eNB) and a terminal (UE) includes a first receiving module for receiving a backhaul downlink signal from the base station, A first transmission module for transmitting a backhaul uplink signal to the base station, a second reception module for receiving an access uplink signal from the terminal, a second transmission module for transmitting an access downlink signal to the terminal, And a processor coupled to the first receiving module, the second receiving module, and the first and second transmitting modules, and controlling the first and second receiving modules and the first and second transmitting modules, (I > = 1) symbols of the first slot of the backhaul downlink subframe, the first i symbols of the first slot of the access downlink subframe corresponding to the first i (I + 1) th symbol in the first slot of the backhaul downlink subframe to an i + j (j? 1) th symbol in the backhaul downlink subframe, and to transmit at least one of an access control channel and a reference signal J + 1 < th > symbol of the first slot of the backhaul downlink subframe to the backhaul downlink subframe through the first reception module, and controls the repeater to perform switching between transmission and reception on an arbitrary time interval in a backhaul downlink subframe, And controls to receive a backhaul downlink signal from the base station in an interval up to the last symbol of the second slot of the downlink subframe, and controls, through the second transmission module, an access downlink subframe following the backhaul downlink subframe, And transmit the access downlink signal to the terminal through the access point.

According to another aspect of the present invention, there is provided a repeater (RN) for communicating with a base station (eNB) and a terminal (UE) includes a first receiving module for receiving a backhaul downlink signal from the base station, A first transmission module for transmitting a backhaul uplink signal to the base station, and a second reception module for receiving an access uplink signal from the terminal. A second transmission module connected to the first and second reception modules and the first and second transmission modules for transmitting an access downlink signal to the terminal, Wherein the processor controls to receive an access uplink signal on an access uplink sub-frame through the second receiving module, and controls the second uplink sub-frame Control of switching between transmission and reception of the repeater in an arbitrary time interval within a first i (i? 1) symbol intervals of a first slot of a backhaul uplink subframe, and controlling, through the first transmission module, In a section from the (i + 1) th symbol of the first slot of the subframe to the last symbol of the second slot of the backhaul uplink subframe, It is possible to control the backhaul uplink signal to be transmitted to the station.

The present invention can provide a method and an apparatus that can easily introduce a repeater into a network system while maintaining the frame transmission timing and structure conforming to existing network system standards as much as possible. In addition, the introduction of a repeater can provide backward compatibility by not requiring changes to the access link subframe structure of the terminal conforming to existing network system standards.

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

1 is a diagram illustrating a wireless communication system including one or more repeaters.
2 is a diagram illustrating an interface between a base station, a repeater, and a terminal in a wireless communication network system
3 is a diagram showing a structure of a radio frame.
4 is a diagram illustrating a downlink time-frequency resource grid structure.
5 is a diagram showing a structure of a downlink sub-frame.
6 is a diagram showing a structure of an uplink sub-frame.
7 is a diagram showing an uplink-downlink frame timing relationship.
8 is a diagram illustrating an embodiment of a subframe structure of a backhaul uplink and an access uplink.
9 is a view showing an embodiment of a sub-frame structure of a backhaul downlink and an access downlink.
10 is a view showing another embodiment of the subframe structure of the backhaul uplink and access uplink.
11 is a view showing another embodiment of the sub-frame structure of the backhaul downlink and the access downlink.
12 is a diagram showing the relationship between the backhaul uplink and the base station reception timing of the eNB-UE uplink.
13 is a diagram illustrating a structure of control information transmitted on a physical uplink shared channel (PUSCH).
14 is a diagram showing a functional module of a repeater.

Best Mode for Carrying Out the Invention

The following embodiments are a combination of elements and features of the present invention in a predetermined form. Each component or characteristic may be considered optional unless otherwise expressly stated. Each component or feature may be implemented in a form that is not combined with other components or features. In addition, some of the elements and / or features may be combined to form an embodiment of the present invention. The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of certain embodiments may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments.

Embodiments of the present invention will be described herein with reference to the relationship between data transmission and reception between a base station and a terminal. Here, the BS has a meaning as a terminal node of a network that directly communicates with the MS. The specific operation described herein as performed by the base station may be performed by an upper node of the base station, as the case may be.

That is, it is apparent that various operations performed for communication with a terminal in a network composed of a plurality of network nodes including a base station can be performed by a network node other than the base station or the base station. A 'base station (BS)' may be replaced by a term such as a fixed station, a Node B, an eNode B (eNB), an access point (AP) Repeaters can be replaced by terms such as Relay Node (RN), Relay Station (RS), and so on. The term 'terminal' may be replaced with terms such as a UE (User Equipment), an MS (Mobile Station), an MSS (Mobile Subscriber Station), or SS (Subscriber Station).

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

In the case of hardware implementation, the method according to embodiments of the present invention may be implemented in one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs) , FPGAs (Field Programmable Gate Arrays), processors, controllers, microcontrollers, microprocessors, and the like.

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

The specific terminology used in the following description is provided to aid understanding of the present invention, and the use of such specific terminology may be changed into other forms without departing from the technical idea of the present invention.

In some instances, well-known structures and devices may be omitted or may be shown in block diagram form, centering on the core functionality of each structure and device, to avoid obscuring the concepts of the present invention. In the following description, the same components are denoted by the same reference numerals throughout the specification.

The following description is to be understood as illustrative and non-limiting, such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access And can be used in various wireless access 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). UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution) is a part of E-UMTS (Evolved UMTS) using E-UTRA, adopting OFDMA in downlink and SC-FDMA in uplink. LTE-A (Advanced) is the evolution of 3GPP LTE. For clarity of description, 3GPP LTE / LTE-A is mainly described, but the technical idea of the present invention is not limited thereto.

3 shows a structure of a radio frame in 3GPP LTE. A radio frame is composed of 10 subframes, and one subframe is composed of two slots. The time taken for one subframe to be transmitted is referred to as a transmission time interval (TTI). For example, the length of one subframe may be 1 ms and the length of one slot may be 0.5 ms.

One slot includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in a time domain and a plurality of RBs (resource blocks) in a frequency domain. The OFDM symbol is used to represent one symbol period because 3GPP LTE uses OFDMA in the downlink and may be referred to as an SC-FDMA symbol or a symbol period according to the multiple access scheme. The RB includes a plurality of consecutive subcarriers in one slot in a resource allocation unit.

The structure of the radio frame is merely an example, and the number of subframes included in a radio frame, the number of slots included in a subframe, and the number of OFDM symbols included in a slot can be variously changed.

FIG. 4 shows a downlink time-frequency resource grid structure used in the present invention.

개의 서브캐리어 (subcarrier)와

개의 OFDM 심볼로 구성되는 도 4와 같은 자원 격자(resource grid)에 의해 묘사될 수 있다. 여기서,

은 하향링크에서의 자원 블록(Resource Block; RB)의 개수를 나타내고,

는 하나의 RB을 구성하는 서브캐리어의 개수를 나타내고,

는 하나의 하향링크 슬롯에서의 OFDM 심볼의 개수를 나타낸다.

의 크기는 셀 내에서 구성된 하향링크 전송 대역폭에 따라 달라지며

≤

≤

을 만족해야 한다. 여기서,

는 무선 통신 시스템이 지원하는 가장 작은 하향링크 대역폭이며

는 무선 통신 시스템이 지원하는 가장 큰 하향링크 대역폭이다.

= 6 이고

= 110 일 수 있지만, 이에 한정되는 것은 아니다. 하나의 슬롯 내에 포함된 OFDM 심볼의 개수는 순환 전치(Cyclic Prefix, CP)의 길이 및 부반송파의 간격에 따라 다를 수 있다. 다중안테나 전송의 경우에, 하나의 안테나 포트 당 하나의 자원 격자가 정의될 수 있다.The downlink signals transmitted in each slot are

Subcarriers < RTI ID = 0.0 >

And can be described by a resource grid as shown in FIG. 4, which is composed of OFDM symbols. here,

Represents the number of resource blocks (RBs) in the downlink,

Denotes the number of subcarriers constituting one RB,

Represents the number of OFDM symbols in one downlink slot.

Depends on the downlink transmission bandwidth configured in the cell

≤

≤

. here,

Is the smallest downlink bandwidth supported by the wireless communication system

Is the largest downlink bandwidth supported by the wireless communication system.

= 6

= 110, but is not limited thereto. The number of OFDM symbols included in one slot may be different depending on the length of a cyclic prefix (CP) and the interval of subcarriers. In the case of multiple antenna transmissions, one resource grid per antenna port may be defined.

에 의해 유일하게 식별된다. 여기서,

는 주파수 영역에서의 인덱스이고

은 시간 영역에서의 인덱스이며

는

중 어느 하나의 값을 갖고,

은

중 어느 하나의 값을 갖는다.Each element in the resource grid for each antenna port is called a Resource Element (RE), and an index pair

≪ / RTI > here,

Is an index in the frequency domain

Is the index in the time domain

The

And has a value of "

silver

Or the like.

The resource block (RB) shown in FIG. 4 is used to describe a mapping relationship between certain physical channels and resource elements. The RB can be divided into a physical resource block (PRB) and a virtual resource block (VRB).

개의 연속적인 OFDM 심볼과 주파수 영역의

개의 연속적인 서브캐리어로 정의된다. 여기서

과

는 미리 결정된 값일 수 있다. 예를 들어

과

는 표 1과 같이 주어질 수 있다. 따라서 하나의 PRB는

×

개의 자원 요소로 구성된다. 하나의 PRB는 시간 영역에서는 하나의 슬롯에 대응되고 주파수 영역에서는 180kHz에 대응될 수 있지만 이에 한정되는 것은 아니다.The one PRB is a time-

Lt; RTI ID = 0.0 > OFDM < / RTI &

Lt; / RTI > subcarriers. here

and

May be a predetermined value. E.g

and

Can be given as shown in Table 1. Therefore, one PRB

×

Resource elements. One PRB corresponds to one slot in the time domain and corresponds to 180 kHz in the frequency domain, but is not limited thereto.

까지의 값을 갖는다. 주파수 영역에서의 PRB 넘버(number)

와 하나의 슬롯 내에서의 자원 요소

사이의 관계는

를 만족한다.In the frequency domain,

Lt; / RTI > The PRB number in the frequency domain

And resource elements in one slot

The relationship between

.

개의 VRB들은 각각 0부터

중 어느 하나의 인덱스 (Index)를 할당 받고, 위의 2개의 슬롯 중 제2 슬롯에 속하는

개의 VRB들도 마찬가지로 각각 0부터

중 어느 하나의 인덱스를 할당 받는다.The VRB may have the same size as the PRB. Two types of VRBs are defined. The first type is Localized VRB (LVRB), and the second type is Distributed VRB (DVRB). For each type of VRB, a pair of VRBs is assigned over two slots in one subframe with a single VRB index (which may be referred to as a VRB number hereinafter). In other words, the subframe belonging to the first one of the two slots constituting one subframe

The number of VRBs is 0

(Index) is assigned to any one of the above two slots,

The number of VRBs is also 0

Quot; index "

The downlink resource structure shown in FIG. 4 is applied to the uplink transmission in substantially the same manner. However, in the uplink using SC-FDMA, the time domain unit can be represented by an SC-FDMA symbol, not an OFDM symbol.

5 shows a structure of a downlink sub-frame. The subframe includes two slots in the time domain. A maximum of 3 OFDM symbols preceding a first slot in a subframe is a control region to which control channels are allocated, and the remaining OFDM symbols are data regions to which PDSCH (Physical Downlink Shared Channel) is allocated.

The downlink control channels used in 3GPP LTE include a Physical Control Format Indicator Channel (PCFICH), a Physical Downlink Control Channel (PDCCH), and a Physical Hybrid-ARQ Indicator Channel (PHICH). The PCFICH transmitted in the first OFDM symbol of the subframe carries information on the number of OFDM symbols (i.e., the size of the control region) used for transmission of the control channels in the subframe. The control information transmitted through the PDCCH is referred to as downlink control information (DCI). DCI indicates uplink resource allocation information, downlink resource allocation information, and uplink transmission power control commands for certain UE groups. The PHICH carries an ACK (Acknowledgment) / NACK (Not-Acknowledgment) signal for an uplink HARQ (Hybrid Automatic Repeat Request). That is, the ACK / NACK signal for the uplink data transmitted by the UE is transmitted on the PHICH.

Hereinafter, a PDCCH which is a downlink physical channel will be described. The PDCCH includes resource allocation information (also referred to as an uplink grant) of a PDSCH resource allocation and transmission format (also referred to as a downlink grant), a physical uplink shared channel (PUSCH) A set of transmit power control commands for UEs, and the activation of VoIP (Voice over Internet Protocol). A plurality of PDCCHs can be transmitted in the control domain, and the UE can monitor a plurality of PDCCHs. The PDCCH consists of one or several consecutive aggregation of control channel elements (CCEs). A PDCCH composed of a set of one or several consecutive CCEs can be transmitted through the control domain after subblock interleaving. The CCE is a logical allocation unit used to provide the PDCCH with the coding rate according to the state of the radio channel. The CCE corresponds to a plurality of resource element groups. The format of the PDCCH and the number of bits of the possible PDCCH are determined according to the relationship between the number of CCEs and the coding rate provided by the CCEs. The control information transmitted through the PDCCH is referred to as downlink control information (DCI).

The base station determines the PDCCH format according to the DCI to be transmitted to the UE, and attaches a CRC (Cyclic Redundancy Check) to the control information. The CRC is masked with a unique identifier (referred to as RNTI (Radio Network Temporary Identifier)) according to the owner or use of the PDCCH. If the PDCCH is for a particular UE, the unique identifier of the UE, e.g., C-RNTI (Cell-RNTI), may be masked in the CRC. Alternatively, if the PDCCH is a PDCCH for a paging message, a paging indication identifier, e.g., P-RNTI (P-RNTI), may be masked on the CRC. If it is a PDCCH for system information, the system information identifier, system information-RNTI (SI-RNTI), can be masked in the CRC. A random access-RNTI (RA-RNTI) may be masked in the CRC to indicate a random access response that is a response to the transmission of the UE's random access preamble.

6 shows a structure of a UL subframe in 3GPP LTE. The uplink subframe can be divided into a control region to which a physical uplink control channel (PUCCH) for carrying uplink control information in a frequency domain is allocated and a data region to which a PUSCH for carrying user data is allocated. To maintain a single carrier characteristic, one UE does not transmit PUCCH and PUSCH at the same time. The PUCCH for one UE is allocated as an RB pair in a subframe, and the RBs belonging to an RB pair occupy different subcarriers in each of two slots. It is assumed that the RB pair allocated to the PUCCH is frequency hopped at the slot boundary.

The uplink-downlink frame timing will be described with reference to FIG.

The MS acquires the downlink subframe reception timing from the main synchronization signal (PSS), the sub synchronization signal (SSS) and the downlink reference signal transmitted from the base station, and transmits the obtained downlink subframe reception timing to the basic uplink transmission timing . The UE can set the acquired downlink reception timing to the PRACH (Physical Random Access Channel) transmission timing in the initial random access procedure. A time synchronization command (TA Command) signaled from a base station to a mobile station through a random access procedure is transmitted to the mobile station in a manner that the transmission timing of the uplink frame from the mobile station is earlier than the current uplink frame transmission timing I.e., a timing advance (TA) value. Accordingly, the UE can determine the uplink transmission timing according to the following equation based on the value of the timing advance TA included in the time synchronization command.

N _TA is a timing advance (TA) value provided by the base station to the UE. The UE can acquire N _TA from the Node B and determine the uplink transmission timing according to Equation (1). Here, N _TA is a timing offset between the DL frame and the UL frame corresponding to the DL frame, and may have a value corresponding to the sum of the DL propagation delay and the UL propagation delay. Further, the upper limit of the value of N _TA can be limited by the size (for example, 100 km) of the base station area, and the range is 0? N _TA ? 20512. Further, N _TA may correspond to the timing advance (TA) value described above. N _TAoffset is a fixed timing offset based on the frame structure and is 0 when the frame structure _complies with Type 1 or Frequency Division Duplex and 614 when following Type 2 or Time Division Duplex . T _S is a basic time unit and is called a sampling time, and T _S has a value of 1 / (15000 × 2048) [sec]. The values of N _TA , N _{TA Offset} , and T _S are illustrative only, and are not limited to the above exemplary values, and appropriate values may be selected according to system requirements.

The UE receiving the time synchronization command can adjust the uplink transmission timing for PUCCH, PUSCH, or SRS (Sounding Reference Signal). The time synchronization command may indicate an uplink timing change for the current uplink transmission timing by a multiple of 16 Ts. In the case of a random access response, the 11-bit time synchronization instruction T _A can indicate the N _TA value as the index value of T _A = 0, 1, 2, ..., 1282. Where the amount of timing alignment can be given by N _TA = T _A x 16. Alternatively, the time synchronization instructions a 6-bit _A T N is the current _TA value _{TA N,} N new _TA value N of the _{old TA,} the adjustment to the _{new T A = 0, 1,} 2, ..., indicated as index values of 63 You may. Here, N _{TA, new} = N _{TA, old} + (T _A - 31) × 16. The amount of adjustment of the positive (+) or negative (-) N _TA value indicates the advance or delay of the uplink transmission timing by a given amount, respectively.

For the time synchronization command received in subframe n, the corresponding timing adjustment may be applied from the beginning of subframe n + 6. In the case where the uplink PUCCH, PUSCH or SRS transmissions of the UEs in subframes n and n + 1 overlap due to timing adjustment, the UE transmits the complete subframe n and the overlapping portion of subframe n + 1 May not transmit.

On the other hand, in the case where the received downlink timing is changed or not compensated or only partially compensated by the uplink timing adjustment without a time synchronization command, the terminal may change the N _TA accordingly.

Hereinafter, the backhaul link between the base station and the relay period, and the access link subframe structure between the relay station and the terminal will be described with reference to Figs. 8 and 9. Fig.

As described above, the backhaul downlink reception and access downlink transmission can be configured in a TDM scheme in order to prevent simultaneous transmission and reception on the same carrier band in the repeater. Accordingly, since the time required for switching between the reception mode and the transmission mode of the repeater is generally greater than the cyclic prefix (CP) length of the symbol, a separate guard interval (Guard Time) for the switching time between transmission and reception of the repeater, May be required. This protection interval can be defined as a transition gap. Similarly, a switching interval may be required in switching between an access uplink reception mode and a backhaul uplink transmission mode in a repeater. Even if such a switching interval is introduced, the switching interval is defined on the backhaul link subframe structure between the base station and the repeater so that the terminal according to the existing network system standard that does not consider the repeater can perform communication even on the network in which the repeater exists. Need to be. That is, the subframe structure of the access link should not be changed in the subframe structure according to the existing network system standard.

In FIG. 8, a subframe structure in which one subframe in the backhaul link and the access link is composed of the first slot and the second slot, and seven symbols are defined in one slot will be described as an example. For example, in the case of a semi-bidirectional communication repeater as described above, for transmission / reception switching from access uplink reception to backhaul uplink transmission, the first symbol of the first slot of the backhaul uplink subframe is set as a switching interval (810). Also, for the transmission / reception switching from the backhaul uplink transmission to the access uplink reception, the last symbol of the second slot of the backhaul uplink subframe may be set as the switching interval 820. [

8 illustrates a backhaul uplink subframe structure. For example, if the repeater switch intervals 810 and 820 are the first symbol of the first slot and the last symbol of the second slot (e.g., 14 of the subframe) Th < th > symbol).

The number and position of the symbols set as the switching intervals are illustrative and are not limited to the above-described embodiments. And may be defined as a conversion interval as two or more symbols depending on the situation of the propagation delay. For example, a switching interval may be set only for one or a plurality of symbols in the front portion of the first slot of the backhaul uplink subframe, or a switching interval may be set for only one or a plurality of symbols of the last portion of the second slot. Alternatively, if the transmission / reception mode switching time of the repeater is shorter than the CP length, the switching interval may not be set. The present invention encompasses that the number or the position of the switching intervals in the access uplink subframe is defined in any symbol interval in the subframe.

Meanwhile, in the case of a semi-bidirectional communication repeater, the following considerations can be taken in connection with the transmission / reception switching from the access downlink transmission to the backhaul downlink reception. A UE compliant with an existing network system standard (for example, an LTE system) transmits a physical downlink control channel (PDCCH), a reference signal (RS), a physical control format indicator channel PCFICH) and so on and perform measurements. The number of symbols on the access downlink transmission sub-frame concerned may be one or two. Thereby determining the number of symbols in the no-hearing zone in the backhaul downlink sub-frame.

In this regard, the backhaul downlink subframe structure will be described with reference to FIG. In order to support the LTE terminal, the repeater sets (910) a symbol of the backhaul downlink subframe corresponding to the number of symbols in the control region of the access downlink subframe to a no-hearing zone (910) An access control channel (PDCCH, etc.) may be transmitted to the terminal in the control domain of the link sub-frame (920). Accordingly, the switching interval between transmission and reception of the repeater can be set in one symbol following the non-listening area of the backhaul downlink subframe (930). The data area following the control area in the access downlink sub-frame, corresponding to the area where the repeater receives signals from the base station via the backhaul downlink, may be blanked (940). Also, for transmission / reception switching from backhaul downlink reception to access downlink transmission, for example, the last symbol 950 of the second slot of the backhaul downlink subframe may be set as the switching interval.

The number and position of the symbols set as the switching intervals are illustrative and are not limited to the above-described embodiments. It may be defined as a conversion interval as two or more symbols depending on the situation of the propagation delay. For example, a switching interval may be set only for one or a plurality of symbols following the repeater non-listening zone of the first slot of the backhaul downlink subframe, or one or more of the last portions of the second slot of the backhaul downlink subframe The switching interval may be set to only one symbol. Alternatively, if the transmission / reception mode switching time of the repeater is shorter than the CP length, the switching interval may not be set. The present invention encompasses that the number or the position of the switching interval in the backhaul downlink subframe is defined in any symbol interval in the subframe.

The introduction of the above-mentioned switching interval is to design a structure of a physical channel for transmission of data and control information transmitted through a sub-frame of a backhaul downlink and a backhaul uplink in a form different from the structure defined in the existing LTE system standard You may also request. In this regard, it is possible to set the mapping in the TB size table on the Physical Downlink Shared Channel (PDSCH) and the correction factor for the CQI (Channel Quality Indicator) offset accordingly.

In addition, when SRS is transmitted in the uplink transmission of the repeater, the SRS is transmitted from the position of the SRS transmission symbol (for example, the last symbol of the subframe) on the uplink subframe defined in the existing LTE system standard The location of the transmission symbol may be defined differently.

Also, when the uplink control information is transmitted during the backhaul uplink transmission of the repeater, the channel structure on the PUCCH formats 1 / 1a / 1b and 2 / 2a / 2b on the backhaul uplink transmission subframe in the existing LTE system standard It can also be changed. Alternatively, when the PUCCH format is not changed, the backhaul uplink control information may be transmitted via the PUSCH. In this regard, it is possible to activate the CQI request field on the uplink grant (DCI format 0 of the PDCCH) and to set the predetermined periodic PUSCH feedback on the radio resource control (RRC) signaling (upper layer signaling) . In the following embodiments, a description will be given taking the case of transmitting the uplink control information through the PUSCH and the case of performing the transmission via the PUCCH.

Hereinafter, an embodiment of the present invention with respect to a new switching interval setting, which is different from the switching interval setting in the backhaul uplink sub-frame described with reference to Figs. 8 and 9, will be described with reference to Figs. 10 and 11. Fig.

In the uplink transmission according to the existing LTE system standard, when data or control information is not transmitted through a physical channel in a certain subframe, the last one or two symbols of the subframe preceding the subframe, It can be designed to turn off the power on the amplifier. In this regard, in order to prevent the reception performance of the uplink signal from being reduced, the guard interval may not be set at the last symbol position of the subframe. In this regard, an access uplink receiving subframe may be located in a subframe subsequent to one backhaul uplink transmission subframe. That is, when the backhaul uplink transmission is not performed in the subframe after the backhaul uplink transmission subframe, it can be considered that no protection interval is set in the last symbol of the backhaul uplink transmission subframe as described above.

In a semi-bidirectional communication repeater, it may be operative to receive an access uplink sub-frame after transmission of the backhaul uplink sub-frame, or alternatively, after transmitting one backhaul uplink sub- It is also possible that the link transmission sub-frame is set. In this case, switching between the transmission and reception of the repeater in the last symbol interval of the backhaul uplink transmission subframe is not performed, so that it is considered not to set the protection interval in the last symbol of the backhaul uplink transmission subframe.

In the case where the switching interval is not set in the last symbol of one backhaul subframe, the following case can be considered.

First, if the Transmit-to-Receive Transition Gap (TTG) of the repeater is designed as a very short hardware compared to one symbol, the switching between transmission and reception is started gradually before the backhaul uplink transmission is completed An access uplink start symbol can be received. However, when the TTG of the repeater takes more than the CP length, it may not be easy to set the above switching interval.

On the other hand, as shown in FIG. 10, the timing of receiving an access uplink in a repeater can be delayed or advanced by a predetermined timing offset as compared with a timing of transmitting a backhaul uplink in a repeater. That is, the timing of receiving an access uplink in a repeater may be shifted by a predetermined timing offset. The timing offset may be, for example, half a symbol length. By doing so, switching from the transmission mode to the reception mode of the repeater can be performed in a period after the completion of the backhaul uplink transmission and before the access uplink is received. That is, the time required for the TTG of the repeater can be absorbed in the non-reception period of the access uplink subframe.

10, when the transmission-reception switching interval (TTG) and the reception-to-transmission switching gap (RTG) of the repeater can be performed in a predetermined interval shorter than the length of one symbol, Frame structure and timing of link transmission and access uplink reception.

The repeater receives the access uplink signal through the access uplink sub-frame, and transmits the access uplink signal to an arbitrary time within the first i (i? 1) symbol intervals of the first slot of the backhaul uplink sub-frame following the access uplink sub- (1010) between the transmission and reception of the repeater. Subsequently, the repeater may transmit the backhaul uplink signal to the base station in the interval from the (i + 1) th symbol of the first slot of the backhaul uplink subframe to the last symbol of the second slot of the backhaul uplink subframe (Backhaul uplink transmission in FIG. 10). Subsequently, an access uplink subframe can be received (access uplink reception in Fig. 10). For example, only the first symbol of the first slot of the backhaul uplink subframe is set as a switching interval 1010 and the last symbol of the second slot of the backhaul uplink subframe (e.g., the 14th symbol of the subframe ) May not set the switching interval. That is, only the switching interval for the RTG is set (1010), and the switching interval for the TTG may not be set.

When the switching interval is set only for the first symbol of the first slot of the backhaul uplink subframe as in the above embodiment, it is possible to transmit the SRS through the last symbol of the second slot of the backhaul uplink subframe. That is, the SRS can be transmitted through the backhaul uplink at the same symbol position as that of the SRS in the UL subframe defined in the existing LTE system standard.

On the other hand, the number of the symbols, the positions, and the alignment of the subframe timing, which are set as the switching intervals, are not limited to the above-described embodiments. If the TTG or RTG value of the repeater is large, it is also possible to consider setting a plurality of symbols at the beginning of the backhaul uplink subframe as the switching interval.

Hereinafter, matters that can be additionally applied to the above-described embodiment will be described.

If more than one symbol is set as the switching interval in the first slot of the backhaul uplink subframe, a change in the physical channel structure of the PUCCH format 1 / 1a / 1b sequence and the PUCCH format 2 / 2a / 2b sequence in the first slot May be required.

In the case of the PUCCH format 1 / 1a / 1b series, a structure punctured with respect to the symbol (s) set as the switching interval (for example, the first symbol of the first slot of the subframe or a plurality of symbols at the beginning of the first slot) Can be applied. Here, a Walsh cover applied on a symbol unit basis in the physical channel structure of the PUCCH format 1 / 1a / 1b is defined as an orthogonal Walsh sequence or a Discrete Fourier Transform (DFT) sequence having a length reduced by the conversion interval from the existing length It is possible. In this regard, the use of a sequence of reduced length may affect the performance of decoding and transmission of uplink PUCCH format 1 sequence from the UEs conforming to the existing LTE system standards to the base station. To prevent this, Lt; RTI ID = 0.0 > Walsh < / RTI > cover sequence for one or more symbols. On the other hand, in a situation where the reduction of the decoding performance of the PUCCH is tolerable in the system and the requirement for the reliability of information such as ACK / NACK is high, a method of transmitting an ACK / NACK through a PUSCH or a method of transmitting a PUSCH And a scheduling request (including a MAC message) transmission scheme may be applied.

As another method, a boundary of the first slot is set behind a symbol, a format of the existing PUCCH 1 / 1a / 1b is used in the first slot and a format of the reduced A reduced PUCCH 1 / 1a / 1b format (shortened format) that applies a DFT sequence as an orthogonal cover may be applied.

If there is a problem in multiplexing the PUCCH transmission on the uplink between the existing base station and the UE in the above embodiments, the PUCCH format transmission resource of the repeater backhaul uplink transmission is allocated to the physical resource block : PRB) It is also possible to consider setting them separately.

On the other hand, in the case of the PUCCH format 2 / 2a / 2b series, the punctured structure can be applied to the symbol (s) set as the switching interval. It may be defined that some sequence portions are punctured in a CQI block code sequence (length 20) that is applied as a rate matching code (RM code). In order to reduce the influence of the punctured structure on the decoding of the CQI block code, mapping may be performed in reverse order or may be permutated arbitrarily, unlike the sequence construction method defined in the existing LTE system standard. Alternatively, if the importance of the CQI block code sequence components is not identical, order conversion or interleaving may be performed in which the component having a low importance is positioned at the beginning.

For the purpose of supplementing the increase of the effective coding rate (ECR) on the overall CQI by the punctured structure of the uplink physical channel as described above, a plurality of PUCCH resources (PUCCH (Physical antennas or virtual antennas) of the RBs, the cyclic shifts, the Walsh covers, or the RBs in the PUCCH format 2 series, and the circular movements in the format 1 sequence are assigned to the respective antennas (physical antennas or virtual antennas) A scheme of deriving the maximum rate combining (MRC) at the receiving end may be applied to the structure of the PUCCH format 1 sequence and the PUCCH format 2 sequence.

Meanwhile, a scheme of setting one switching interval in the above-described backhaul uplink subframe can be similarly applied to a backhaul downlink subframe structure. The backhaul downlink subframe structure will be described with reference to FIG. A symbol of a backhaul downlink subframe corresponding to a control region of an access downlink subframe is set as a no-hearing zone (1110), and a PDCCH or the like is transmitted from the control region of the access downlink subframe to a terminal (1120). Accordingly, the switching interval of the repeater from the transmission mode to the reception mode may be set to 930 in one symbol subsequent to the non-listening area of the backhaul downlink subframe. On the other hand, the switching interval for the transmission / reception switching from the backhaul downlink reception to the access downlink transmission may not be set.

If the RTG of the repeater is designed as very short hardware as compared with one symbol, the access downlink start symbol can be transmitted by gradually switching between transmission and reception before the backhaul downlink reception is completed. However, if the RTG of the repeater takes more than the CP length, it may not be easy to set the above switching interval.

On the other hand, as shown in FIG. 11, the timing of transmitting the access downlink in the repeater can be set to be delayed or ahead of the timing of receiving the backhaul uplink in the repeater by a predetermined timing offset. That is, the timing of transmitting the access downlink in the repeater can be shifted by a predetermined timing offset. The timing offset may be, for example, half a symbol length. By doing so, switching from the reception mode to the transmission mode of the repeater can be performed in a period from completion of the backhaul downlink reception to transmission of the access downlink. That is, the time required for the RTG of the repeater can be absorbed in the non-transmission period of the access downlink subframe.

FIG. 11 shows the structure and timing of the backhaul downlink reception and access downlink transmission in the case where the TTG and the RTG of the repeater can be performed in a predetermined interval shorter than the length of one symbol.

For example, the repeater may control access to the terminal from the first i symbols of the first slot of the access downlink subframe, corresponding to the first i (i? 1) symbols of the first slot of the backhaul downlink subframe, Channel and a reference signal (1120). Next, the repeater performs switching between transmission and reception of the repeater on a predetermined time interval in the interval from the (i + 1) th symbol to the (i + 1) th symbol in the first slot of the backhaul downlink subframe (1130). Here, the value of j may be determined by setting the length of a time interval for switching between transmission and reception of the repeater and the number of PDCCH transmission symbols from the base station to the UE. The repeater receives the backhaul downlink signal from the base station in the interval from the (i + j + 1) th symbol of the first slot of the backhaul downlink subframe to the last symbol of the second slot of the backhaul downlink subframe (Downlink reception), and may transmit an access downlink signal to the terminal through an access downlink subframe subsequent to the backhaul downlink subframe (access downlink transmission in FIG. 11).

For example, as shown in FIG. 11, only one symbol subsequent to the non-listening area 1110 of the first slot of the backhaul downlink subframe is set as the switching interval 1130, and the backhaul downlink subframe The switching interval may not be set in the last symbol of the second slot of the subframe (e.g., the 14th symbol of the subframe). That is, only the switching interval for the TTG is set (1130), and the switching interval for the RTG is not set. The number, position, and sub-frame timing alignment of the symbols set in the switching interval are illustrative and are not limited to the above-described embodiments.

Hereinafter, referring to FIG. 12, a description will be made of an embodiment in which a switching interval of two parts is set on one backhaul uplink subframe.

As shown in FIG. 1, an eNB-UE, a RN-UE, and a repeater may be present in the serving area of the base station. The base station can signal a time synchronization command (Timing Advance Command) to the terminal (eNB-UE) and the repeaters served by the base station (see FIG. 7 and Equation 1). The BS basically considers the propagation delay between the BS and the MS or a repeater through a random access procedure from the MS and the RS to estimate the uplink transmission timing offset value at the current uplink transmission timing of the MS and the RS Signaling the included time synchronization command. With this time synchronization command, the uplink reception timings from the terminals and the repeaters serving from the base station can be aligned with a predetermined reference (e.g., in accordance with the downlink transmission timing from the base station).

The relay and the uplink transmission from the eNB-UE will be described below. The switching interval between transmission and reception can be set to the first symbol of the first slot of the backhaul uplink subframe and the last slot of the second slot to absorb the TTG and the RTG of the repeater from the backhaul link as described with reference to FIG. 810 and 820 of FIG. 8). Meanwhile, the uplink subframe from the eNB-UE to the base station according to the existing LTE system standard can be set to transmit the SRS through the last symbol of the second slot of the subframe. Meanwhile, according to the backhaul uplink subframe structure as shown in FIG. 8, since the switching interval 820 is set in the last symbol of the second slot of the subframe, the SRS can not be transmitted through the last symbol. In this case, it may be set to transmit the SRS through a symbol immediately before the last symbol of the second slot of the backhaul uplink subframe.

In this case, when the timing at which the backhaul uplink signal from the repeater is received at the base station and the timing at which the uplink signal from the eNB-UE is received at the base station are aligned as described above, the repeater and the eNB- The SRSs from the symbol positions are present at different symbol positions in time (Fig. 12 (a) and (b)). In this regard, the base station determines that the timing at which the uplink signal transmitted from the repeater is received at the base station is smaller than the timing at which the uplink signal from the eNB-UE is received at the base station by a switching interval (for example, one symbol length) And may signal to the repeater a time synchronization command that includes a timing offset value that causes it to be delayed. FIG. 12 (c) shows the base station reception timing of the backhaul uplink signal transmitted by the repeater to the base station according to this time synchronization command. By doing so, SRSs at the same symbol position in time from the base station reception point can be received from the eNB-UE and the repeater (Figs. 12B and 12C).

In the above-described embodiments of the present invention, in the case of the PUCCH transmitted from the relay, the orthogonality with the PUCCH transmitted from the other terminals may be reduced. This can occur especially due to the mish match of the Walsh cover timing in the PUCCH format 1 / 1a / 1b. In this case, the uplink control information may be transmitted in a piggyback manner through the PUSCH. Here, the multiplexing scheme according to the existing LTE system standard can be applied to the control information multiplexing scheme on the PUSCH.

On the other hand, in the case of PUCCH format 2 / 2a / 2b, it may be considered to puncture symbols through which the switching interval and SRS are transmitted. In order to guarantee the coding performance, as described in the embodiment related to FIG. 10, in order to apply the order conversion on the CQI block code sequence component or allocate different PUCCH resources for each antenna in the case of a repeater having multiple antennas, It is possible to apply the method of reducing

In the embodiments of the present invention described above, a DM RS (Demodulation Reference Signal) may be a position on a slot of a symbol through which a DM RS is transmitted (for example, a fourth CP Symbol) may be timing offset such that it precedes the transition interval similar to the location of the symbol transmitting the SRS described in connection with FIG. If the overlapping of the data of neighboring cells and the reference signals does not significantly affect the system performance, the position of the symbol on which the DM RS is transmitted on the slot may be referred to as the uplink sub-frame from the other terminals (eNB- It is also possible to make the position of the DM RS transmission symbol on the slot on the same.

FIG. 13 shows a structure for transmitting control information on the PUSCH. In a case where a switching interval is set on a backhaul uplink subframe transmitted by a repeater, a CQI, a Precision Matrix Indicators (PMI), and a data transmission symbol may be mapped to remaining physical resources other than physical resources of symbols for which a switching interval is set .

In a situation where a switching interval is set to the first symbol of the first slot of the backhaul uplink subframe and a switching interval is not set to the last symbol of the second slot (backhaul uplink subframe structure of FIG. 10) Dependent scheduling mode without channel-dependent scheduling in a manner that allocates resources (RB) in the frequency domain in transmitting the backhaul uplink signal. In this regard, a method in which a physical uplink shared channel (PDSCH) hopes for frequency hopping in the frequency domain based on a certain rule or formula at a slot boundary can be applied. In addition, it is possible to prevent the repeater from transmitting the SRS, thereby preventing the collision between the symbol for which the switching interval is set and the symbol for transmitting the SRS.

Further, information on the uplink grant via the PDCCH (DCI format 0) may be provided from the base station. In this regard, it may support dynamic allocation from a resource block (RB) allocation number (size of a resource block) to a variable or predetermined location part in a link configuration based on a DM RS other than the SRS or a geometrical arrangement resulting from data decoding . If the size and location of the resource block (RB) are fixed in terms of resource allocation for the backhaul uplink subframe, the uplink grant may not be transmitted.

14 shows a functional module of a repeater. Only the functions of downlink transmission and uplink reception are required for the base station and only the functions of downlink reception and uplink transmission are required for the base station. On the other hand, the repeater is required to perform downlink reception from the base station, uplink transmission to the base station, It is necessary to perform both the uplink transmission from the base station and the downlink transmission to the terminal. The transceiver of the repeater includes a first receiving module 1410 (receiving a backhaul downlink) 1420, a second receiving module 1420 (receiving an access uplink) 1420, a first transmitting module (transmitting a backhaul uplink) A first transmission module 1430 and a second transmission module (transmitting an access downlink) 1440. In addition, the repeater may include a processor 1450. Processor 1450 may be connected to and exchange data with receive modules 1410 and 1420 and transmit modules 1430 and 1440 and may receive receive modules 1410 and 1420 and transmit modules 1430 and 1440 Can be controlled. The processor 1450 may include a transmission module control unit 1451, a reception module control unit 1452, and a transmission / reception switching control unit 1453. In addition, the repeater may include a memory unit 1460. The receiving modules 1110 and 1120, the transmitting modules 1130 and 1140, the processor 1450 and the memory unit 1460 can exchange information through a bus.

The downlink communication operation of the repeater will be described. The reception module control unit 1452 of the processor 1450 controls the first reception module 1410 not to receive the backhaul downlink signal from the base station during the first i symbols of the first slot of the backhaul downlink subframe from the base station Can be controlled (i? 1). That is, a repeater non-listening zone can be set in the first i symbols of the first slot of the backhaul downlink subframe. The repeater non-listening area may be set to a position corresponding to the first i symbols of the first slot of the subframe of the access downlink, i.e., the access downlink control area, as shown in Fig. 9 (i? 1 ). The transmission module control unit 1451 can control the second transmission module 1440 to transmit the control channel signals (PDCCH, RS, PCFICH) of the access downlink to the mobile station during the repeater non-listening interval.

Transmission / reception switching controller 1453 can control the half-duplex repeater to switch from the backhaul downlink reception mode to the access downlink transmission mode or vice versa. Alternatively, the switching controller 1453 can control the half-duplex repeater to switch from the backhaul uplink transmission mode to the access uplink reception mode or vice versa.

Due to the time it takes for the repeater to switch between transmit and receive, it may be necessary to set the switch interval in the sub-frame symbols on the backhaul link or access link of the repeater. In this regard, the switching control unit 1453 between the transmission and reception may control to prevent the transmission or reception operation from being performed in the repeater during the set transition interval. The setting of the time interval for this switching interval may be, for example, j symbols following the repeater non-listening zone, i + 1 th symbol to i + j th symbol of the first slot of the backhaul downlink subframe (J > = 1). During the transition interval, the repeater may switch from the access downlink transmission mode to the backhaul downlink reception mode. Here, the value of j may be determined by setting the length of a time interval for switching between transmission and reception of the repeater and the number of PDCCH transmission symbols from the base station to the UE.

After the switching between the transmission and reception of the repeater is completed, the reception module control unit 1452 can control the first reception module 1410 to receive the backhaul downlink signal from the base station. The repeater repeats the backhaul downlink signal from the base station over the entire interval from the symbol number i + j + 1 of the first slot of the backhaul downlink subframe to the last symbol of the second slot of the subframe of the backhaul downlink Can be controlled.

After the reception of the backhaul downlink signal is completed, the switching controller 1453 between the transmission and reception can control the repeater to switch from the backhaul downlink reception mode to the access downlink transmission mode. When the timing of transmitting the access downlink signal in the repeater is set to be delayed by a predetermined timing offset (for example, one symbol length corresponding to the switching interval) as compared with the timing of receiving the backhaul downlink signal, The repeater can switch from the reception mode to the transmission mode for a time corresponding to the timing offset without setting a separate switching interval in the last symbol of the second slot of the subframe. The transmission module control unit 1451 can control the second transmission module 1440 to transmit an access downlink signal to the terminal in a subsequent access downlink subframe.

The uplink communication operation of the repeater will be described. The reception module control unit 1452 can control the second reception module 1420 to receive the access uplink signal from the terminal. In order to transmit the backhaul uplink after the access uplink signal reception is completed, the half-duplex repeater needs to be switched from the reception mode to the transmission mode.

In this regard, a transition gap between transmission and reception of the repeater can be set to the first i (i? 1) symbols of the first slot of the backhaul uplink subframe. During the switching interval, the switching controller 1453 can control the repeater to switch from the access uplink reception mode to the backhaul uplink transmission mode.

Subsequently, the transmission module control unit 1451 causes the first transmission module 1430 to transmit the entire interval from the (i + 1) th symbol of the first slot of the backhaul uplink subframe to the last symbol of the second slot of the subframe To control the backhaul uplink signal to be transmitted to the base station.

After the transmission of the backhaul uplink signal is completed, the switching controller 1453 between the transmission and reception can control the repeater to switch from the backhaul uplink transmission mode to the access uplink reception mode. When the timing of receiving an access uplink signal in a repeater is set to be delayed by a predetermined timing offset (for example, one symbol length corresponding to a switching interval) in comparison with a timing of transmitting a backhaul uplink signal, The repeater can switch from the transmission mode to the reception mode for a time corresponding to the timing offset without setting a separate switching interval in the last symbol of the second slot of the subframe. The receiving module control unit 1452 can control the second receiving module 1420 to receive the access uplink signal from the terminal in a subsequent access uplink sub-frame.

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

The present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Accordingly, the above description should not be construed in a limiting sense in all respects and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention. The present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. In addition, claims that do not have an explicit citation in the claims may be combined to form an embodiment or be included in a new claim by amendment after the filing.

Industrial availability

The communication method and apparatus for a repeater and a terminal according to an embodiment of the present invention are industrially applicable in a mobile communication system or a wireless communication industry.

Claims (11)

A method for a repeater to perform downlink communication,
Receiving a downlink signal from a base station in a downlink subframe including first and second slots,
Wherein the transmission from the base station to the repeater is performed on OFDM symbols other than the first i (i? 1) OFDM symbols of the first slot of the downlink sub-frame,
The transmission from the base station to the repeater and the transmission from the repeater to the terminal are configured in a time division multiplexing manner,
Wherein a timing at which transmission from the repeater to the MS starts is shifted by a half symbol length from a timing at which transmission from the BS to the repeater ends. The method according to claim 1,
Wherein the transmission from the base station to the repeater is performed on all OFDM symbols of the second slot of the downlink sub-frame. The method according to claim 1,
Wherein the transmission from the base station to the repeater is performed on a time domain other than the last one OFDM symbol of the second slot of the downlink sub-frame. The method according to claim 1,
Wherein control information is transmitted over the physical downlink control channel (PDCCH) from the repeater to the terminal within the first i OFDM symbols of the first slot of the downlink sub-frame. The method according to claim 1,
Wherein the transmission from the repeater to the terminal is not performed in OFDM symbols other than the first i OFDM symbols of the first slot of the downlink subframe. The method according to claim 1,
Wherein the first i OFDM symbols of the first slot of the downlink subframe include a transmission / reception switching interval of the repeater. The method of claim 3,
And the last one OFDM symbol of the second slot of the downlink subframe includes a transmission / reception switching interval of the repeater. The method according to claim 1,
1 < / = i < / = 3. The method according to claim 1,
Wherein the downlink subframe is set to a general cyclic prefix (CP). The method according to claim 1,
Wherein each of the first and second slots comprises seven OFDM symbols. A repeater for performing downlink communication,
A receiving module for receiving a backhaul downlink signal from a base station;
A transmission module for transmitting an access downlink signal to a terminal; And
And a processor connected to the receiving module and the transmitting module, the processor controlling the repeater including the receiving module and the transmitting module,
Wherein the processor is configured to receive a downlink signal from the base station in a downlink subframe including first and second slots through the receiving module;
Wherein the transmission from the base station to the repeater is performed on OFDM symbols other than the first i (i? 1) OFDM symbols of the first slot of the downlink sub-frame,
The transmission from the base station to the repeater and the transmission from the repeater to the terminal are configured in a time division multiplexing manner,
Wherein a timing at which transmission from the repeater to the MS starts is shifted by a half symbol length from a timing at which transmission from the BS to the repeater ends.

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