WO2010095883A2 - Method and apparatus for communication between a relay node and user equipment in a wireless communication system - Google Patents

Abstract

The present invention relates to a wireless communication system, and discloses a method and an apparatus for communication between a relay node (RN) and user equipment (UE) in the wireless communication system. The method for enabling the relay node to perform downlink communication with a base station (eNB) and the user equipment, according to one embodiment of the present invention, comprises the steps of: transmitting, to the user equipment, at least an access control channel or a reference signal in the first i number (wherein, i≥1) of symbols of a first slot of an access downlink subframe set from the relay node to the user equipment, wherein said symbols correspond to the first i number of symbols of a first slot of a backhaul downlink subframe set from the base station to the relay node; switching transmitting and receiving operations of the relay node in a predetermined slot in a period from the (i+1)th symbol to the (i+j)th symbol (wherein, j≥1) of the first slot of the backhaul downlink subframe; receiving, from the base station, a backhaul downlink signal in the period from the (i+j+1)th symbol of the first slot of the backhaul downlink subframe to the last symbol of a second slot of the backhaul downlink subframe; and transmitting an access downlink signal to the user equipment via an access downlink subframe which follows the backhaul downlink subframe.

Description

Communication method and apparatus for repeater and terminal in wireless communication system

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

1 illustrates one or more Relay Nodes (RNs) present in one eNodeB (eNB) region in a wireless communication system. The repeater may transmit data received from the base station to a user equipment (UE) in the repeater area and transmit data received from the terminal in the repeater area to the base station. In addition, the repeater can support extending the high data rate range, improving the communication quality at the cell edge, and providing communication within the building or beyond the base station service area. In FIG. 1, there may be a terminal (hereinafter, referred to as RN-UE) receiving a service from a relay, such as UE1 to UE3, and a terminal (hereinafter, referred to as eNB-UE) directly receiving a service from a base station, such as UE4. 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. In addition, 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 relay to the terminal may be referred to as access downlink, and the link from the terminal to the repeater may be referred to as access uplink. The case in which the backhaul link operates in the same frequency band as the access link is called "in-band", and the case in which the backhaul link and the access link operate in different frequency bands is "out-band". "I can say.

Unlike the base station requires only downlink transmission and uplink reception functions, and the terminal requires only uplink transmission and downlink reception functions, the repeater is used for downlink transmission, downlink reception, uplink transmission, and uplink reception. All functionality is required.

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

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

When a repeater for transmitting and receiving between the backhaul link and the access link is introduced, there is a need for a repeater transmitting / receiving method capable of supporting a terminal conforming to existing network system standards without changing the subframe structure of the access link. .

In order to solve the above technical problem, a method for performing downlink communication with a base station eNB and a UE in a repeater RN according to an embodiment of the present invention includes a backhaul downlink from the base station to the repeater. Access from the relay to the terminal corresponding to the first i (i≥1) symbols of the first slot of the subframe Access control channel and reference to the terminal in the first i symbols of the first slot of the downlink subframe Transmitting at least one of a reference signal, on a predetermined time interval within an interval from an i + 1 th symbol to an i + j (j≥1) th symbol of the first slot of the backhaul downlink subframe Performing switching between the transmission and reception of the repeater, starting from an i + j + 1 th symbol of the first slot of the backhaul downlink subframe to a second slot of the backhaul downlink subframe; Receiving a backhaul downlink signal from the base station in a section up to a film symbol; and transmitting an access downlink signal to the terminal through an access downlink subframe subsequent to the backhaul downlink subframe. have.

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

The repeater may also be a half-duplex repeater that alternately receives the backhaul downlink signal and transmits the access downlink signal.

In addition, the timing of transmitting the access downlink subframe in the repeater may be shifted by a predetermined timing offset compared to the timing of receiving the backhaul downlink subframe in the repeater.

In order to solve the above technical problem, a method for performing uplink communication with a base station (eNB) and a terminal (UE) in a repeater (RN) according to another embodiment of the present invention, access uplink from the terminal to the repeater Receiving an access uplink signal on a subframe, within an initial i (i≥1) symbol period of a first slot of a backhaul uplink subframe from the repeater following the access uplink subframe to the base station; Performing switching between the transmission and reception of the repeater over an arbitrary time interval, and from an i + 1 th symbol of the first slot of the backhaul uplink subframe to the last symbol of a second slot of the backhaul uplink subframe And transmitting a backhaul uplink signal to the base station in the interval.

The repeater may be a half-duplex repeater which alternately transmits a backhaul uplink signal and receives 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.

In order to solve the above technical problem, a repeater (RN) communicating with a base station (eNB) and a terminal (UE) according to another embodiment of the present invention, the first receiving module for receiving a backhaul downlink signal from the base station, A first transmitting module for transmitting a backhaul uplink signal to the base station, a second receiving module for receiving an access uplink signal from the terminal, a second transmitting module for transmitting an access downlink signal to the terminal, the first and A processor connected to a second receiving module and the first and second transmitting modules, the processor controlling the first and second receiving modules and the first and second transmitting modules, wherein the processor is configured to transmit the second transmitting module. Via the module, in 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 in the backhaul downlink subframe, Control to transmit at least one of an access control channel and a reference signal to the terminal, and from i + 1 th symbol to i + j (j≥1) th symbol of the first slot of the backhaul downlink subframe Control the repeater to switch between transmission and reception on any time interval within the interval of and, from the i + j + 1 th symbol of the first slot of the backhaul downlink subframe, through the first receiving module An access downlink subframe subsequent to the backhaul downlink subframe is controlled through the second transmission module by controlling to receive a backhaul downlink signal from the base station in a section up to the last symbol of a second slot of a downlink subframe. It may be controlled to transmit an access downlink signal to the terminal through.

In order to solve the above technical problem, a repeater (RN) communicating with a base station (eNB) and a terminal (UE) according to another embodiment of the present invention, the first receiving module for receiving a backhaul downlink signal from the base station, A first transmitting module for transmitting a backhaul uplink signal to the base station, A second receiving module for receiving an access uplink signal from the terminal. A second transmission module for transmitting an access downlink signal to the terminal, the first and second reception modules, and the first and second transmission modules, and the first and second reception modules and the first and second transmission modules. A processor for controlling a second transmitting module, wherein the processor is configured to control to receive an access uplink signal through an access uplink subframe through the second receiving module, and to follow the access uplink subframe. Control switching between the transmission and reception of the repeater on any time interval within the first i (i≥1) symbol intervals of the first slot of the backhaul uplink subframe, and through the first transmission module, the backhaul uplink The base in the interval 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 may be controlled to transmit the backhaul uplink signal to the station.

The present invention can provide a method and apparatus for easily introducing a repeater into a network system while maintaining the frame transmission timing and structure according to existing network system standards to the maximum. In addition, the introduction of the repeater can provide backward compatibility by not requiring a change in the access link subframe structure of the terminal according to the existing network system standards.

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

1 illustrates 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 illustrating a structure of a radio frame.

4 is a diagram illustrating a downlink time-frequency resource grid structure.

5 is a diagram illustrating a structure of a downlink subframe.

6 is a diagram illustrating a structure of an uplink subframe.

7 illustrates an uplink-downlink frame timing relationship.

8 illustrates an embodiment of a subframe structure of a backhaul uplink and an access uplink.

FIG. 9 is a diagram illustrating an embodiment of a subframe structure of backhaul downlink and access downlink. FIG.

10 illustrates another embodiment of a subframe structure of a backhaul uplink and an access uplink.

11 illustrates another embodiment of a subframe structure of backhaul downlink and access downlink.

12 is a diagram illustrating a relationship between a base station reception timing of a backhaul uplink and an 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 illustrating a functional module of a repeater.

The following embodiments combine the components and features of the present invention in a predetermined form. Each component or feature may be considered to be optional unless otherwise stated. Each component or feature may be embodied in a form that is not combined with other components or features. In addition, some components 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 components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment.

In the present specification, embodiments of the present invention will be described based on a relationship between data transmission and reception between a base station and a terminal. Here, the base station has a meaning as a terminal node of the network that directly communicates with the terminal. The specific operation described as performed by the base station in this document may be performed by an upper node of the base station in some cases.

That is, it is obvious that various operations performed for communication with a terminal in a network composed of a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station. A 'base station (BS)' may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point (AP), and the like. The repeater may be replaced by terms such as relay node (RN) and relay station (RS). In addition, the term 'terminal' may be replaced with terms such as a user equipment (UE), a mobile station (MS), a mobile subscriber station (MSS), or a subscriber station (SS).

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

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

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

Specific terms used in the following description are provided to help the understanding of the present invention, and the use of such specific terms may be changed to other forms without departing from the technical spirit of the present invention.

In some instances, well-known structures and devices may be omitted or shown in block diagram form centering on the core functions of the structures and devices in order to avoid obscuring the concepts of the present invention. In addition, the same components will be described with the same reference numerals throughout the present specification.

The following techniques include code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and the like. It can be used in various radio access systems. CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA). UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) long term evolution (LTE) is part of an Evolved UMTS (E-UMTS) using E-UTRA, and employs OFDMA in downlink and SC-FDMA in uplink. LTE-A (Advanced) is the evolution of 3GPP LTE. For clarity, the following description focuses on 3GPP LTE / LTE-A, but the technical spirit of the present invention is not limited thereto.

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

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

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

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

The downlink signal transmitted in each slot

Subcarriers

It may be depicted by a resource grid as shown in FIG. 4 composed of four OFDM symbols. here,

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

Represents the number of subcarriers constituting one RB,

Denotes the number of OFDM symbols in one downlink slot.

The size of depends on the downlink transmission bandwidth configured within the cell.

≤

≤

Must be satisfied. 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 vary depending on the length of a cyclic prefix (CP) and the spacing of subcarriers. In case of multi-antenna transmission, one resource grid may be defined per one antenna port.

Each element in the resource grid for each antenna port is called a resource element (RE) and is an index pair in the slot

Uniquely identified by here,

Is the index in the frequency domain

Is the index in the time domain

Is

Has a value of any of

silver

Has any one of the values.

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).

The one PRB is a time domain

Contiguous OFDM symbols and frequency domain

It is defined as two consecutive subcarriers. here

and

May be a predetermined value. E.g

and

May be given as shown in Table 1. So one PRB

×

It consists of four resource elements. One PRB may correspond to one slot in the time domain and 180 kHz in the frequency domain, but is not limited thereto.

Table 1

PRB is at 0 in the frequency domain

Has a value up to. PRB number in frequency domain

And resource elements within one slot

The relationship between

Satisfies.

The VRB may have the same size as the PRB. Two types of VRBs are defined, the first type being a localized VRB (LVRB) and the second type being a distributed VRB (DVRB). For each type of VRB, a pair of VRBs are allocated over two slots of one subframe with a single VRB index (hereinafter may also be referred to as VRB number). In other words, belonging to the first slot of the two slots constituting one subframe

VRBs from 0 each

One of the above two slots belongs to the second slot

VRBs likewise start with 0

Any one of the indexes is allocated.

The downlink resource structure shown in FIG. 4 applies substantially to uplink transmission. However, in the case of uplink to which SC-FDMA is applied, a time domain unit may be expressed as an SC-FDMA symbol instead of an OFDM symbol.

5 shows a structure of a downlink subframe. The subframe includes two slots in the time domain. Up to three OFDM symbols in the first slot in the subframe are the control region to which control channels are allocated, and the remaining OFDM symbols are the data region to which the Physical Downlink Shared Channel (PDSCH) is allocated.

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 about the number of OFDM symbols (that is, the size of the control region) used for transmission of control channels in the subframe. Control information transmitted through the PDCCH is referred to as downlink control information (DCI). DCI indicates uplink resource allocation information, downlink resource allocation information, and uplink transmission power control command for arbitrary UE groups. The PHICH carries an ACK (Acknowledgement) / NACK (Not-Acknowledgement) signal for an uplink HARQ (Hybrid Automatic Repeat Request). That is, the ACK / NACK signal for the uplink data transmitted by the terminal is transmitted on the PHICH.

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

The base station determines the PDCCH format according to the DCI to be sent to the terminal, 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 purpose of the PDCCH. If the PDCCH is for a specific terminal, a unique identifier of the terminal, for example, a C-RNTI (Cell-RNTI) may be masked to the CRC. Alternatively, if the PDCCH is for a paging message, a paging indication identifier, for example, P-RNTI (P-RNTI), may be masked to the CRC. If it is a PDCCH for system information, a system information identifier and a system information-RNTI (SI-RNTI) may be masked to the CRC. A random access-RNTI (RA-RNTI) may be masked to the CRC to indicate a random access response that is a response to the transmission of the random access preamble of the UE.

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

The uplink-downlink frame timing will be described with reference to FIG. 7.

The UE acquires a downlink subframe reception timing from a main synchronization signal (PSS), a subsynchronization signal (SSS), a downlink reference signal, and the like transmitted from the base station, and based on the obtained downlink subframe reception timing, the basic uplink transmission timing Can be used as The UE may determine the obtained downlink reception timing as a physical random access channel (PRACH) transmission timing on an initial random access process. The Timing Advance Command (TA Command) signaled from the base station to the terminal through a random access procedure causes the timing of the uplink frame transmission from the terminal to be earlier than the current uplink frame transmission timing. It may include a value of whether it should be, that is, a timing advance (TA) value. Accordingly, the terminal may determine the uplink transmission timing by the following equation based on the timing advance (TA) value included in the time synchronization command.

Equation 1

N _TA is a timing advance (TA) value provided by the base station to the terminal. The terminal obtains N _TA from the base station, and may determine uplink transmission timing according to Equation 1. Here, N _TA is a timing offset between a downlink frame and an uplink frame corresponding to the downlink frame, and may have a value corresponding to the sum of the downlink propagation delay and the uplink propagation delay. Also, the upper limit of the value of N _TA may be limited by the size of the base station area (for example, 100 km), and the range is 0 ≦ N _TA ≦ 20512. In addition, N _TA may correspond to the above-described timing advance TA value. N _TAoffset is a fixed timing offset based on the frame structure, which is 0 when the frame structure _conforms to the Type 1 or Frequency Division Duplex, and 614 when the frame structure conforms to the 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 _TAoffset , and T _S are exemplary only, and are not limited to the above exemplary values, and an appropriate value may be selected according to system requirements.

Upon receiving the time synchronization command, the UE may adjust uplink transmission timing for PUCCH, PUSCH, or SRS (Sounding Reference Signal). The time synchronization command may indicate an uplink timing change with respect to the current uplink transmission timing in multiples of 16 Ts. In the case of a random access response, the 11-bit time synchronization command T _A may indicate the N _TA value as an index value of T _A = 0, 1, 2,..., 1282. Here, the amount of timing alignment can be given by N _TA = T _A × 16. Alternatively, the 6-bit time synchronization command T _A indicates the adjustment of the current N _TA value N _{TA, old to} the new N _TA value N _{TA, new} as an index value of T _A = 0, 1, 2, ..., 63. You may. Here, N _{TA, new} = N _{TA, old} + (T _A -31) x 16. A positive or negative adjustment amount of the N _TA value indicates an advance or delay of 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. When uplink PUCCH, PUSCH or SRS transmission of the UE in subframes n and n + 1 overlap due to timing adjustment, the UE transmits a complete subframe n and the overlapping portion of subframe n + 1 May not transmit.

On the other hand, when the received downlink timing is not compensated even if it is changed or only partially compensated by uplink timing adjustment without a time synchronization command, the UE may change the N _TA accordingly.

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

As described above, the backhaul downlink reception and the access downlink transmission may 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 repeater's receive mode and the transmit mode is generally larger than the cyclic prefix (CP) length of the symbol, a separate guard time for switching time between the transmitter and the receiver is guarded. May need to be set. This guard interval may be defined as a transition gap. Similarly, a switching interval may be required when switching between the access uplink reception mode and the backhaul uplink transmission mode in the 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 without considering the repeater can communicate 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 a backhaul link and an access link is configured with a first slot and a second slot, and seven symbols are defined in one slot will be described as an example. For example, in the case of the semi-bidirectional relay as described above, for the transmission and reception switching from the access uplink reception to the backhaul uplink transmission, the first symbol of the first slot of the backhaul uplink subframe is set to the switching interval. It may be 810. In operation 820, the last symbol of the second slot of the backhaul uplink subframe may be set as a switching interval with respect to the transmission and reception switching from the backhaul uplink transmission to the access uplink reception.

FIG. 8 illustrates a backhaul uplink subframe structure, for example, the repeater switching intervals 810 and 820 may include a first symbol of a first slot and a last symbol of a second slot (eg, 14 of a subframe). The first symbol).

The number and position of the symbols set as the switching intervals are exemplary and are not limited to the above-described embodiment. Depending on the propagation delay, two or more symbols may be defined as the switching interval. For example, the switching interval may be set only for one or a plurality of symbols in the front part of the first slot of the backhaul uplink subframe, or the switching interval may be set only for one or a plurality of symbols in the last part of the second slot. Alternatively, when 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 location of transition intervals in the access uplink subframe is defined in any symbol period in the subframe.

Meanwhile, in the case of a semi-bidirectional communication relay, the following matters may be considered with respect to switching of transmission and reception from access downlink transmission to backhaul downlink reception. A terminal conforming to an existing network system standard (eg, an LTE system) includes a physical downlink control channel (PDCCH), a reference signal (RS), and a physical control format indicator channel in the control region of all downlink subframes. PCFICH) and the like and need to perform a measurement. The number of symbols on the associated access downlink transmission subframe may be one or two. This determines the number of symbols in the no hearing zone in the backhaul downlink subframe.

In this regard, the backhaul downlink subframe structure will be described with reference to FIG. 9. In order for the repeater to support the LTE terminal, the symbol of the backhaul downlink subframe corresponding to the number of symbols of the control region of the access downlink subframe is set to a no-hearing zone (910), and the access downlink An access control channel (PDCCH, etc.) may be transmitted to the terminal in the control region of the link subframe (920). Accordingly, the switching interval between the transmission and reception of the repeater may be set in one symbol following the non-listening area of the backhaul downlink subframe (930). The data region following the control region in the access downlink subframe, corresponding to the region where the repeater receives signals from the base station via the backhaul downlink, may be blanked (940). In addition, for transmission and reception switching from the backhaul downlink reception to the access downlink transmission, for example, the last symbol 950 of the second slot of the backhaul downlink subframe may be set as a switching interval.

The number and position of the symbols set as the switching intervals are exemplary and are not limited to the above-described embodiment. Depending on the propagation delay, two or more symbols may be defined as the switching interval. For example, only one or a plurality of symbols subsequent to the relay non-listening zone of the first slot of the backhaul downlink subframe are set to have a transition interval, or one or more of the last part of the second slot of the backhaul downlink subframe. The switching interval may be set only for the four symbols. Alternatively, when 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 includes that the number of transition intervals or positions thereof in the backhaul downlink subframe is defined in any symbol period in the subframe.

The introduction of the switching interval described above is to design a physical channel structure for transmission of data and control information transmitted through subframes of the backhaul downlink and the backhaul uplink in a form different from that defined in the existing LTE system standard. May require In this regard, a mapping factor in a transport block (TB) size table on a physical downlink shared channel (PDSCH) and a correction factor for a channel quality indicator (CQI) offset accordingly may be set.

In addition, when the SRS is transmitted during the backhaul uplink transmission of the repeater, the SRS is transmitted at the position (eg, the last symbol of the subframe) of the SRS transmission symbol on the uplink subframe defined in the existing LTE system standard. Since the SRS can be defined differently from the position of the transmission symbol.

In addition, in the case of transmitting uplink control information 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 You can also change it. Or, if the PUCCH format is not changed, the backhaul uplink control information may be transmitted through the PUSCH. In this regard, the CQI request field on the uplink grant (DCI format 0 of the PDCCH) may be activated, and predetermined periodic PUSCH feedback on radio resource control (RRC) signaling (upper layer signaling) without adjustment of the uplink grant is parameterized. It can also be defined as. The following embodiments will be described in consideration of a method of performing uplink control information transmission through a PUSCH and a case of performing a PUCCH.

Hereinafter, an embodiment of the present invention for setting a new switching interval different from the setting of the switching interval in the backhaul uplink subframe described with reference to FIGS. 8 and 9 will be described with reference to FIGS. 10 and 11.

In uplink transmission according to the existing LTE system standard, when data or control information is not transmitted through a physical channel in a subframe, a transmitting end in the last one or two symbols of the subframe preceding the subframe It may be designed that a power off on the amplifier is made. In this regard, the guard period may not be set at the last symbol position of the subframe in order to prevent the reception performance of the uplink signal from being reduced. In this regard, an access uplink reception 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, as described above, it may be considered not to set the guard interval in the last symbol of the backhaul uplink transmission subframe.

Meanwhile, in the semi-bidirectional communication relay, the access uplink subframe may be received after the transmission of the backhaul uplink subframe, or alternatively, the subsequent backhaul uplink is transmitted after transmitting one backhaul uplink subframe. It is also possible for a link transmission subframe to be set. In this case, since switching between the transmission and reception of the repeater is not performed in the last symbol period of the backhaul uplink transmission subframe, it may be considered not to set a guard period in the last symbol of the backhaul uplink transmission subframe.

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

First, if the repeater's Transmit-to-Receive Transition Gap (TGT) is designed as a very short piece of hardware for a single symbol, it will gradually start switching between transmit and receive before the end of the backhaul uplink transmission. An access uplink start symbol may be received. However, when the TTG of the repeater takes more than the CP length, the switching interval setting as described above may not be easy.

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

FIG. 10 illustrates a backhaul uplink in a case in which a repeater's transmit-receive transition interval (TTG) and a receive-to-transmit transition interval (RTG) of the repeater may be performed in a predetermined interval smaller than the length of one symbol. The subframe structure and timing of link transmission and access uplink reception are shown.

The repeater receives the access uplink signal on the access uplink subframe, and any time within the first i (i ≧ 1) symbol periods of the first slot of the backhaul uplink subframe following the access uplink subframe. In operation 1010, switching between the transmission and reception of the repeater may be performed. Subsequently, the repeater may transmit a backhaul uplink signal to the base station in an 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 of FIG. 10). Subsequently, an access uplink subframe may be received (access uplink reception of FIG. 10). For example, only the first symbol of the first slot of the backhaul uplink subframe is set to the switching interval (1010), and the last symbol of the second slot of the backhaul uplink subframe (eg, the 14th symbol of the subframe). ) May not set the conversion interval. That is, only the switching interval for RTG may be set (1010), and the switching interval for TTG may not be set.

As described above, when the switching interval is set only to the first symbol of the first slot of the backhaul uplink subframe, the SRS can be transmitted 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 uplink subframe defined in the existing LTE system standard.

Meanwhile, the number, position, and subframe timing alignment of the symbols set as the switching intervals are not limited to the above-described embodiment. When the TTG or RTG value of the repeater is large, it may be considered to set a plurality of symbols at a switching interval in front of the backhaul uplink subframe.

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

When one or more symbols are set in the first slot of the backhaul uplink subframe as the switching interval, a change in the physical channel structure of the PUCCH format 1 / 1a / 1b series and the PUCCH format 2 / 2a / 2b series in the first slot is performed. May be required.

In the PUCCH format 1 / 1a / 1b series, a punctured structure is formed for symbol (s) (eg, the first symbol of a first slot of a subframe or a plurality of symbols at the beginning) of a switching interval. Applicable In this case, a Walsh cover applied in units of symbols on a physical channel structure of PUCCH format 1 / 1a / 1b may be defined as an orthogonal Walsh sequence or a DFT (Discrete Fourier Transform) sequence having a length reduced by a conversion interval from an existing length. It may be. In this regard, the use of a reduced length sequence may affect the decoding performance of the uplink PUCCH format 1 series transmission from the terminals complying with the existing LTE system standard to the base station. It may be considered to apply perforation on the Walsh cover sequence for one or more symbols in. On the other hand, in a situation where the reduction of the decoding performance of the PUCCH is acceptable in the system and the requirement for the reliability of information such as ACK / NACK is high, a scheme for transmitting ACK / NACK or a PUSCH through the PUSCH is provided. The scheduling request (including the MAC message) transmission scheme used may be applied.

Alternatively, as defined in the existing LTE standard, the boundary of the first slot is set behind one symbol, the existing PUCCH 1 / 1a / 1b format is used for the first slot, and the reduced number defined in the existing LTE for the second slot is reduced. As an orthogonal cover, a reduced PUCCH 1 / 1a / 1b format using a DFT sequence may be applied.

In the above-described embodiments, when there is a problem in multiplexing with PUCCH transmission on the uplink between the existing base station and the UE, the PUCCH format transmission resource of the repeater backhaul uplink transmission is physical resource block on the frequency resource region. It may also be considered to set the information in units of PRB).

Meanwhile, in the case of the PUCCH format 2 / 2a / 2b series, a punctured structure may be applied to the symbol (s) set at the switching interval. It may be defined that some sequence portion is punctured in the CQI block code sequence (length 20) applied as a rate matching code (RM code). In order to reduce the effect of the punctured structure on the decoding of the CQI block code, unlike the sequence configuration method defined in the existing LTE system standard, it may be mapped in reverse order or arbitrarily permutated. Alternatively, when the importance of the CQI block code sequence elements is not the same, ordering or interleaving may be performed in a manner of placing the low priority component 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 or for another purpose, a plurality of PUCCH resources (PUCCH) for the repeater with multiple transmit antennas Resource block (RB), cyclic shift, Walsh cover, or RB in PUCCH format 2 series, cyclic shift) are assigned to each antenna (physical antenna or virtual antenna) differently, The method of deriving the maximum ratio combining (MRC) at the receiving end may be applied to the structures of the PUCCH format 1 series and the PUCCH format 2 series.

Meanwhile, the above-described method of setting one switching interval in the backhaul uplink subframe may be similarly applied to the backhaul downlink subframe structure. A backhaul downlink subframe structure will be described with reference to FIG. 11. A symbol of the backhaul downlink subframe corresponding to the control region of the access downlink subframe is set to a no-hearing zone (1110), and a PDCCH or the like is transmitted from the control region of the access downlink subframe to the UE. It may transmit (1120). Accordingly, the transition interval from the transmission mode to the reception mode of the repeater may be set in one symbol following the non-listening area of the backhaul downlink subframe (930). Meanwhile, a switching interval for transmission / reception switching from backhaul downlink reception to access downlink transmission may not be set.

When the RTG of the repeater is designed as a very short hardware compared to 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, when the RTG of the repeater takes more than the CP length, the above-described switching interval may not be easily set.

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

FIG. 11 illustrates the subframe structure and timing of backhaul downlink reception and access downlink transmission when the TTG and RTG of the repeater can be performed in a predetermined interval smaller than the length of one symbol.

For example, the repeater may control access to the terminal in 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 in the backhaul downlink subframe. One or more of a channel and a reference signal may be transmitted (1120). Next, the repeater may perform switching between the transmission and reception of the repeater on a predetermined time interval within an interval from the i + 1 th symbol of the first slot to the i + j (j≥1) th symbol of the backhaul downlink subframe. It may be 1130. Here, the value of j may be determined by setting the length of the time interval for switching between the transmission and reception of the repeater and the number of PDCCH transmission symbols from the base station to the UE. In the period 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, the repeater receives the backhaul downlink signal from the base station (the backhaul of FIG. 11). Downlink reception), an access downlink signal may be transmitted to the terminal through an access downlink subframe subsequent to the backhaul downlink subframe (access downlink transmission of 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 to the switching interval (1130), and the backhaul downlink subframe The transition interval may not be set to the last symbol of the second slot of the (eg, the 14th symbol of the subframe). That is, only the switching interval for the TTG may be set (1130), and the switching interval for the RTG may not be set. The number, position, and subframe timing alignment of the symbols set as the switching intervals are exemplary and are not limited to the above-described embodiment.

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

As shown in FIG. 1, a serving area of a base station (eNB-UE), a terminal served by a repeater (RN-UE), and a repeater may be present in a serving area of the base station. The base station may signal a timing synchronization command to an eNB-UE and repeaters served by the base station (see FIG. 7 and Equation 1). The base station basically considers a propagation delay between the base station and the terminal or the repeater through random access procedure from the terminal and the repeater, and determines an uplink transmission timing offset value from the current uplink transmission timing of the terminal and the repeater. Signal a time synchronization command to include. By this time synchronization command, the uplink reception timing from the terminals and repeaters served by the base station may be aligned on a predetermined basis (for example, in accordance with the downlink transmission timing from the base station).

The uplink transmission from the repeater and the eNB-UE is described below. As described with reference to FIG. 8, switching intervals between transmission and reception may be set in the first symbol of the first slot of the backhaul uplink subframe and the last slot of the second slot so as to absorb the TTG and RTG of the repeater in the backhaul link ( 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 may be configured to transmit the SRS through the last symbol of the second slot of the subframe. Meanwhile, according to the backhaul uplink subframe structure of FIG. 8, since the switching interval 820 is set in the last symbol of the second slot of the subframe, the SRS cannot be transmitted through the last symbol. In this case, the SRS may be transmitted 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 eNB-UE received at the base station The SRS from will be at different symbol positions in time (FIGS. 12A and 12B). In this regard, the base station may be configured such that the timing at which the uplink signal transmitted from the repeater is received at the base station is increased by the switching interval (for example, one symbol length) compared to the timing at which the uplink signal from the eNB-UE is received at the base station. The time synchronization command including the timing offset value to be delayed may be signaled to the repeater. FIG. 12C illustrates a base station reception timing of a backhaul uplink signal transmitted from a repeater to a base station according to this time synchronization command. By doing so, the SRS at the same symbol position in time can be received from the eNB-UE and the relay from the base station reception point of view ((b) and (c) of FIG. 12).

In the above-described embodiments of the present invention, in the case of the PUCCH transmitted from the repeater, orthogonality with the PUCCH transmitted from other terminals may be reduced. This may occur due to Walsh cover timing mismatch, especially in 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 method according to the existing LTE system standard may be applied as the control information multiplexing method on the PUSCH.

Meanwhile, in the case of the PUCCH format 2 / 2a / 2b, it may be considered to puncture symbols in which the switching interval and the SRS are transmitted. As described in the embodiment related to FIG. 10 to guarantee encoding performance, ECR may be applied by applying an order transform on a CQI block code sequence component or by assigning different PUCCH resources to each antenna in the case of a relay having multiple antennas. Decreasing measures may be applicable.

In the above-described embodiments of the present invention, the fourth position of one slot (comprising seven symbols in the case of a normal CP) on a slot of a symbol on which a DM RS (Demodulation Reference Signal) is transmitted. Symbol) may be timing offset such that it is advanced by the switching interval similarly to the position of the symbol transmitting the SRS described with reference to FIG. 12. If the overlapping of the data of the adjacent cells and the reference signals does not significantly affect the system performance, the position on the slot of the symbol in which the DM RS is transmitted is an uplink subframe from other UEs (eNB-UEs). It is also possible to equalize the position of the DM RS transmission symbol on the slot on the slot.

13 shows a structure for transmitting control information on a PUSCH. When the switching interval is set on the backhaul uplink subframe transmitted by the repeater, CQI, PMI (Precoding Matrix Indicators) and data transmission symbols may be mapped to the remaining physical resources except the physical resource of the symbol for which the switching interval is set. .

Repeater is set in a situation in which the switching interval is set to the first symbol of the first slot of the backhaul uplink subframe and the switching interval is not set to the last symbol of the second slot (backhaul uplink subframe structure of FIG. 10). In transmitting the backhaul uplink signal, it is possible to follow the non-channel-dependent scheduling mode without using channel-dependent scheduling in a manner of allocating a resource (RB) on the frequency domain. In this regard, a scheme in which the physical uplink shared channel (PDSCH) is frequency hopping in the frequency domain based on a predetermined rule or equation at the slot boundary may be applied. In addition, the repeater may be configured not to transmit the SRS, thereby preventing collision between the symbol having the switching interval and the symbol transmitting the SRS.

In addition, information on an uplink grant on the PDCCH (DCI format 0) may be provided from a base station. In this regard, the link configuration based on the geometric arrangement according to the DM RS or the data decoding result rather than the SRS may support dynamic allocation from the number of resource block (RB) allocations (size of the resource block) to a variable or predetermined position part. . If the size and location of the resource block (RB) is fixed in view of resource allocation for the backhaul uplink subframe, the uplink grant may not be transmitted.

14 shows a functional module of a repeater. While the base station requires only the functions of downlink transmission and uplink reception, and only the functions of downlink reception and uplink transmission are required for the terminal, the repeater receives the downlink from the base station, uplink transmission to the base station, and the terminal. It is necessary to perform both functions of uplink transmission from the downlink and downlink transmission to the terminal. The transmitter / receiver of the repeater includes a first receiving module (receiving a backhaul downlink) 1410, a second receiving module (receiving an access uplink) 1420, and a first transmitting module (receiving a backhaul uplink) of FIG. 14. 1430 and a second transmission module (which transmits an access downlink) 1440. In addition, the repeater may include a processor 1450. The processor 1450 may be connected to and exchange data with the receiving modules 1410 and 1420 and the transmitting modules 1430 and 1440, and may receive the receiving modules 1410 and 1420 and the transmitting modules 1430 and 1440. Can be controlled. The processor 1450 may include a transmission module controller 1451, a reception module controller 1452, and a switching controller 1453 between transmission and reception. 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 may exchange information through a bus.

The downlink communication operation of the repeater will be described. The receiving module controller 1452 of the processor 1450 causes the first receiving module 1410 not to receive a backhaul downlink signal from the base station during the first i symbols of the first slot of the subframe of the backhaul downlink from the base station. Can be controlled (i≥1). That is, a repeater no hearing zone may be set in the first i symbols of the first slot of the subframe of the backhaul downlink. The relay non-listening zone may be set to a position corresponding to the first i symbols of the first slot of the subframe of the access downlink, that is, the access downlink control region, as shown in FIG. 9 (i ≧ 1). ). The transmission module controller 1451 may control the second transmission module 1440 to transmit the control channel signals PDCCH, RS, and PCFICH of the access downlink to the terminal during the repeater non-listening period.

The transmission / reception switching controller 1453 may control the half-duplex repeater to switch from the backhaul downlink reception mode to the access downlink transmission mode or vice versa. Alternatively, the transmission / reception switching controller 1453 may 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 transition interval in the subframe symbol on the backhaul link or access link of the repeater. In this regard, the switching between the transmission and reception 1453 may control not to perform the transmission or reception operation in the repeater during the set switching interval. The setting of the time interval for this switching interval is, for example, j symbols subsequent to the relay non-listening zone, i.e., from the i + 1 th symbol of the first slot of the backhaul downlink subframe to the i + j th symbol. It can be set on a predetermined time interval within the interval of (j≥1). The repeater may switch from the access downlink transmission mode to the backhaul downlink reception mode during the switching interval. Here, the value of j may be determined by setting the length of the time interval for switching between the transmission and reception of the repeater and the number of PDCCH transmission symbols from the base station to the UE.

After switching between the transmission and reception of the repeater is completed, the receiving module controller 1452 may control the first receiving module 1410 to receive the backhaul downlink signal from the base station. The repeater receives a backhaul downlink signal from the base station in the entire period from the symbol number i + j + 1 of the first slot of the subframe of the backhaul downlink to the last symbol of the second slot of the subframe of the backhaul downlink. Can be controlled to receive.

After reception of the backhaul downlink signal is completed, the transmission / reception switching control unit 1453 may control the repeater to switch from the backhaul downlink reception mode to the access downlink transmission mode. If 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) compared to the timing of receiving the backhaul downlink signal, the backhaul downlink Even without setting a separate switching interval in the last symbol of the second slot of the subframe, the repeater may switch from the reception mode to the transmission mode for a time corresponding to the timing offset. The transmission module controller 1451 may 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 receiving module controller 1452 may control the second receiving module 1420 to receive an access uplink signal from the terminal. In order to transmit the backhaul uplink after the access uplink signal reception is completed, a half-duplex repeater needs to be switched from the reception mode to the transmission mode.

In this regard, the transition gap between the transmission and reception of the repeater may be set in the first i (i≥1) symbols of the first slot of the subframe of the backhaul uplink. During the switching interval, the transmission / reception switching control unit 1453 may 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 complete the entire interval from the i + 1 th symbol of the first slot of the subframe of the backhaul uplink to the last symbol of the second slot of the subframe. In the UE, it may be controlled to transmit a backhaul uplink signal to the base station.

After transmission of the backhaul uplink signal is completed, the transmission / reception switching control unit 1453 may control the repeater to switch from the backhaul uplink transmission mode to the access uplink reception mode. If the timing of receiving the access uplink signal at the repeater is set to be delayed by a predetermined timing offset (for example, one symbol length corresponding to the switching interval) compared to the timing of transmitting the backhaul uplink signal, the backhaul uplink Even without setting a separate switching interval in the last symbol of the second slot of the subframe, the repeater may switch from the transmission mode to the reception mode for a time corresponding to the timing offset. The receiving module controller 1452 may control the second receiving module 1420 to receive an access uplink signal from the terminal in a subsequent access uplink subframe.

The detailed description of the preferred embodiments of the invention disclosed as described above is provided to enable those skilled in the art to implement and practice the invention. Although the above has been described with reference to preferred embodiments of the present invention, those skilled in the art will understand that various modifications and changes can be made without departing from the scope of the present invention. For example, those skilled in the art can use each of the configurations described in the above-described embodiments in combination with each other. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

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

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

Claims (9)

1. A method for performing downlink communication with a base station eNB and a UE in a repeater RN,

   The first i of the first slot of the access downlink subframe from the repeater to the terminal, corresponding to the first i (i ≧ 1) symbols of the first slot of the backhaul downlink subframe from the base station to the repeater Transmitting at least one of an access control channel and a reference signal from a symbol to the terminal;

   Performing switching between the transmission and reception of the repeater on a predetermined time interval within an interval from an i + 1 th symbol to an i + j (j≥1) th symbol of the first slot of the backhaul downlink subframe;

   Receiving a backhaul downlink signal from the base station in an interval from an i + j + 1th symbol of the first slot of the backhaul downlink subframe to a last symbol of a second slot of the backhaul downlink subframe; And

   And transmitting an access downlink signal to the terminal through an access downlink subframe subsequent to the backhaul downlink subframe.
2. The method of claim 1,

   And the first i symbols of the first slot of the backhaul downlink subframe are set to a repeater no hearing zone that does not receive a backhaul downlink signal from the base station.
3. The method of claim 1,

   And the repeater is a half-duplex repeater which alternately receives a backhaul downlink signal and transmits an access downlink signal.
4. The method of claim 1,

   The timing of transmitting the access downlink subframe in the repeater is shifted by a predetermined timing offset compared to the timing of receiving the backhaul downlink subframe in the repeater.
5. A method for performing uplink communication with a base station eNB and a UE in a repeater RN,

   Receiving an access uplink signal from the terminal through an access uplink subframe to the repeater;

   Perform switching between the transmission and reception of the repeater on any time interval within the first i (i≥1) symbol intervals of the first slot of the backhaul uplink subframe from the repeater to the base station following the access uplink subframe Doing; And

   Transmitting a backhaul uplink signal to the base station in a period from an i + 1 th symbol of the first slot of the backhaul uplink subframe to a last symbol of a second slot of the backhaul uplink subframe; Repeater uplink communication method.
6. The method of claim 5,

   And the repeater is a half-duplex repeater which alternately transmits a backhaul uplink signal and receives an access uplink signal.
7. The method of claim 5,

   The timing of the access uplink subframe in the repeater is shifted by a predetermined timing offset compared to the timing of transmitting the backhaul uplink subframe in the repeater.
8. As a relay (RN) in communication with a base station (eNB) and a terminal (UE),

   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 receiving 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 connected to the first and second receiving modules and the first and second transmitting modules and controlling the first and second receiving modules and the first and second transmitting modules,

   The processor,

   Via the second transmission module, access to the terminal in the first i symbols of the first slot of an access downlink subframe, corresponding to the first i (i ≧ 1) symbols of the first slot in a backhaul downlink subframe Control to transmit at least one of a control channel and a reference signal,

   Control the repeater to switch between transmission and reception on an arbitrary time interval within an interval from an i + 1 th symbol to an i + j (j≥1) th symbol of the first slot of the backhaul downlink subframe,

   Through the first receiving module, a backhaul downlink from the base station in an interval from an i + j + 1th symbol of the first slot of the backhaul downlink subframe to a last symbol of a second slot of the backhaul downlink subframe To receive the link signal,

   And controlling, via the second transmitting module, to transmit an access downlink signal to the terminal through an access downlink subframe subsequent to the backhaul downlink subframe.
9. As a relay (RN) in communication with a base station (eNB) and a terminal (UE),

   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 receiving 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 connected to the first and second receiving modules and the first and second transmitting modules and controlling the first and second receiving modules and the first and second transmitting modules,

   The processor,

   Control to receive an access uplink signal through an access uplink subframe through the second receiving module,

   Control to perform switching between the transmission and reception of the repeater on any time interval within the first i (i≥1) symbol intervals of the first slot of the backhaul uplink subframe subsequent to the access uplink subframe,

   Through the first transmission module, a 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 To control the transmission.

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