WO2010101366A2 - 무선통신 시스템에서 중계국의 데이터 수신방법 및 장치 - Google Patents
무선통신 시스템에서 중계국의 데이터 수신방법 및 장치 Download PDFInfo
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- WO2010101366A2 WO2010101366A2 PCT/KR2010/001144 KR2010001144W WO2010101366A2 WO 2010101366 A2 WO2010101366 A2 WO 2010101366A2 KR 2010001144 W KR2010001144 W KR 2010001144W WO 2010101366 A2 WO2010101366 A2 WO 2010101366A2
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- pdcch
- relay station
- allocation information
- base station
- resource allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
- H04B7/15542—Selecting at relay station its transmit and receive resources
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2603—Arrangements for wireless physical layer control
- H04B7/2606—Arrangements for base station coverage control, e.g. by using relays in tunnels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0094—Indication of how sub-channels of the path are allocated
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
Definitions
- the present invention relates to wireless communications, and more particularly, to a method and apparatus for receiving data by a relay station in a backhaul link between a base station and a relay station in a wireless communication system.
- ITU-R International Telecommunication Union Radio communication sector
- IP Internet Protocol
- LTE-Advanced LTE-Advanced
- the main technology of LTE-A includes relay station technology.
- a relay station is a device for relaying a signal between a base station and a terminal, and is used to expand cell coverage and improve throughput of a wireless communication system.
- a base station transmits only resource block allocation information in a frequency domain for a physical downlink shared channel (PDSCH) in which data is transmitted through a physical downlink control channel (PDCCH) in which a control signal is transmitted to a user equipment.
- PDSCH physical downlink shared channel
- PDCCH physical downlink control channel
- the allocation information for the orthogonal frequency division multiplexing (OFDM) symbol in the region is not transmitted. This is because the allocation information for the OFDM symbol in the time domain for the PDSCH can be known from the size (the number of OFDM symbols) of the PDCCH transmitted through the Physical Control Format Indicator Channel (PCFICH).
- PCFICH Physical Control Format Indicator Channel
- an OFDM symbol capable of receiving the PDCCH from the base station may vary according to the size of the PDCCH transmitted by the base station to the terminal and the size of the PDCCH transmitted by the relay station to the terminal connected to the relay station. There is this. Therefore, in the conventional method, the relay station may not be able to properly receive the PDCCH from the base station, and as a result, may not be able to properly receive the data.
- An object of the present invention is to provide a method and apparatus for efficiently receiving data in a backhaul link between a base station and a relay station in a wireless communication system including the relay station.
- a data receiving method of a relay station may include receiving radio resource allocation information from a base station through a relay-physical downlink control channel (R-PDCCH); And receiving data from the base station through a relay-physical downlink shared channel (R-PDSCH) indicated by the radio resource allocation information, wherein the radio resource allocation information includes allocation information and time of a resource block in a frequency domain. It is characterized in that the allocation information of the OFDM symbol in the area.
- R-PDCCH relay-physical downlink control channel
- R-PDSCH relay-physical downlink shared channel
- the relay station includes an RF unit for transmitting and receiving radio signals; And a processor coupled to the RF unit, wherein the processor receives radio resource allocation information from a base station through a relay-physical downlink control channel (R-PDCCH) and indicates an R-PDSCH (indicated by the radio resource allocation information).
- R-PDCCH relay-physical downlink control channel
- the radio resource allocation information is characterized in that the allocation information of the resource block in the frequency domain and the OFDM symbol allocation information in the time domain.
- Relay station in a backhaul link between a base station and a relay station in a wireless communication system including a relay station by providing radio resource allocation information indicating a time relationship between a control channel transmitted from a base station to a terminal and a control channel transmitted from a relay station to a terminal connected to the relay station. This signal can be reliably received by the base station.
- 1 shows a wireless communication system.
- FIG. 2 shows a wireless communication system including a relay station.
- FIG 3 illustrates a structure of a frequency division duplex (FDD) radio frame in a 3GPP LTE system.
- FDD frequency division duplex
- FIG. 4 is an exemplary diagram illustrating a resource grid for one slot.
- FIG 5 shows an example of a downlink subframe structure used in 3GPP LTE.
- FIG. 6 illustrates an example of OFDM symbols in which a relay station may receive data according to the relay station PDCCH size in one subframe when the base station transmits data to the relay station.
- FIG. 7 shows an example of allocating radio resources to transmit an R-PDSCH in a subframe from a base station.
- FIG. 8 shows another example of allocating radio resources to transmit an R-PDSCH in a subframe from a base station.
- FIG. 9 shows a data receiving method of a relay station according to an embodiment of the present invention.
- FIG. 10 shows an example of radio resource allocation in a subframe when there is an R-PCFICH indicating the R-PDCCH size.
- FIG. 11 shows an example of radio resource allocation between a base station and a relay station according to another embodiment.
- FIG. 12 shows an example of allocating radio resources for transmitting an R-PDSCH in a subframe from a base station perspective according to an embodiment of the present invention.
- FIG. 13 is a block diagram illustrating a wireless communication system in which an embodiment of the present invention is implemented.
- LTE Long Term Evolution
- E-UMTS Evolved-Universal Mobile Telecommunications System
- OFDMA OFDMA
- SC-FDMA SC-FDMA
- LTE-Advance (LTE-A) is an evolution of LTE.
- the LTE system is a system based on 3GPP TS Release 8, and the LTE-A system has backward compatibility with the LTE system.
- the LTE terminal is a terminal that supports LTE
- LTE-A terminal is a terminal that supports LTE and / or LTE-A.
- the LTE terminal is a first terminal supporting a first radio access technology (RAT)
- the LTE-A terminal is a second supporting a second RAT providing backward compatibility to the first RAT. It may be represented by a terminal.
- RAT radio access technology
- 1 shows a wireless communication system.
- the wireless communication system 10 includes at least one base station 11 (BS).
- Each base station 11 provides a communication service for a particular geographic area 15, commonly referred to as a cell.
- the cell can be further divided into a plurality of areas, each of which is called a sector.
- the base station 11 generally refers to a fixed station communicating with the terminal 12, and includes an evolved NodeB (eNB), a Base Transceiver System (BTS), an Access Point, an Access Network (AN), and the like. It may be called in other terms.
- the base station 11 may perform functions such as connectivity, management, control, and resource allocation with the terminal 12.
- the terminal 12 may be fixed or mobile, and may include a mobile station (MS), a user terminal (UT), a subscriber station (SS), a wireless device, a personal digital assistant (PDA), It may be called other terms such as a wireless modem, a handheld device, and an access terminal (AT).
- MS mobile station
- UT user terminal
- SS subscriber station
- PDA personal digital assistant
- DL downlink
- UL uplink
- a relay station (RS) 16 refers to a device that relays a signal between the base station 11 and the terminal 14 and may be called other terms such as a relay node, a repeater, and a relay station.
- the terminal may be classified into a macro terminal (Mac UE) and a relay station terminal (relay UE).
- the macro terminal is a terminal that communicates directly with the base station 11
- the relay station terminal 14 refers to a terminal that communicates with the relay station 16. Even in the macro terminal 13 in the cell of the base station 11, it is possible to communicate with the base station 11 via the relay station 16 to improve the transmission rate according to the diversity effect.
- the macro terminal 13 and / or the relay station terminal 14 may include an LTE terminal or an LTE-A terminal.
- the backhaul link means a link between the base station 11 and the relay station 16
- the backhaul downlink means communication from the base station 11 to the relay station 16
- the backhaul uplink means the relay station 16.
- An access link means a link between the relay station 16 and the relay station terminal 14, and the access downlink means communication from the relay station 16 to the relay station terminal 14, and the access uplink means the relay station terminal 14 From the relay to the relay station 16.
- FIG. 3 illustrates a structure of a frequency division duplex (FDD) radio frame in a 3GPP LTE system. This may be referred to Section 4.1 of 3GPP TS 36.211 (V8.4.0) "Technical Specification; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation (Release 8)".
- FDD frequency division duplex
- a radio frame consists of 10 subframes and one subframe consists of two slots.
- one subframe may have a length of 1 ms, and one slot may have a length of 0.5 ms.
- the slot may consist of seven orthogonal frequency division multiplexing (OFDM) symbols in a normal cyclic prefix (CP), and may consist of six OFDM symbols in an extended CP.
- OFDM orthogonal frequency division multiplexing
- CP normal cyclic prefix
- a normal subframe having a normal CP may include 14 OFDM symbols
- an extended subframe having an extended CP may include 12 OFDM symbols.
- 3 is only an example of a radio frame structure, and the number of subframes included in the radio frame or the number of slots included in the subframe may be variously changed.
- FIG. 4 is an exemplary diagram illustrating a resource grid for one slot.
- a slot (eg, a downlink slot included in a downlink subframe) includes a plurality of OFDM symbols in a time domain.
- one downlink slot includes 7 OFDM symbols and one resource block includes 12 subcarriers in the frequency domain, but is not limited thereto.
- Each element on the resource grid is called a resource element, and one resource block (RB) includes 12 ⁇ 7 resource elements.
- the number N DL of resource blocks included in the downlink slot depends on the downlink transmission bandwidth set in the cell.
- FIG 5 shows an example of a downlink subframe structure used in 3GPP LTE.
- a subframe includes two slots. Up to four OFDM symbols of the first slot in the subframe are control regions to which control channels are allocated, and the remaining OFDM symbols are data regions to which a Physical Downlink Shared Channel (PDSCH) is allocated.
- PDSCH Physical Downlink Shared Channel
- Downlink control channels used in LTE include a Physical Control Format Indicator Channel (PCFICH), a Physical Hybrid-ARQ Indicator Channel (PHICH), and a Physical Downlink Control Channel (PDCCH).
- PCFICH Physical Control Format Indicator Channel
- PHICH Physical Hybrid-ARQ Indicator Channel
- PDCCH Physical Downlink Control Channel
- the PCFICH is transmitted in the first OFDM symbol of a subframe and carries information about the number of OFDM symbols (ie, the size in the time domain of the control region) used for transmission of control channels within the subframe.
- 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.
- the PHICH duration refers to the number of OFDM symbols that can be used for transmission of the PHICH.
- PDCCH is a resource allocation and transmission format of downlink shared channel (DL-SCH), resource allocation information of uplink shared channel (UL-SCH), paging information on PCH, system information on DL-SCH, random access response transmitted on PDSCH Resource allocation of a higher layer control message, a set of transmission power control commands for individual terminals in an arbitrary terminal group, and activation of a Voice over Internet Protocol (VoIP).
- DL-SCH downlink shared channel
- UL-SCH uplink shared channel
- paging information on PCH system information on DL-SCH
- random access response transmitted on PDSCH Resource allocation of a higher layer control message a set of transmission power control commands for individual terminals in an arbitrary terminal group
- VoIP Voice over Internet Protocol
- a plurality of PDCCHs may be transmitted in the control region, and the terminal may monitor the plurality of PDCCHs.
- the PDCCH is transmitted on one or several consecutive CCE (aggregation of control channel elements).
- CCE is a logical allocation unit used to provide a
- 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 DCI indicates uplink resource allocation information (or uplink grant), downlink resource allocation information (or downlink grant), and uplink transmission power control command for arbitrary UE groups.
- the following table shows DCI according to DCI format.
- DCI format 0 indicates uplink resource allocation information
- DCI formats 1 to 2 indicate downlink resource allocation information
- DCI formats 3 and 3A indicate uplink transmit power control (TPC) commands for arbitrary UE groups. .
- 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 DCI.
- 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.
- RNTI Radio Network Temporary Identifier
- a space for searching for a PDCCH in the control region is called a search space.
- the set of monitored PDCCH candidates is defined according to the search space.
- a search space is a set of contiguous CCEs starting at a specific starting point in the CCE set according to the CCE aggregation level.
- the CCE aggregation level is a CCE unit for searching a PDCCH, and its size is defined by the number of adjacent CCEs.
- the CCE aggregation level also means the number of CCEs used to transmit the PDCCH.
- Each search space is defined according to the CCE aggregation level.
- the positions of the PDDCH candidates occur at the size of every CCE aggregation level in the search space.
- the search space may be classified into a common search space and a UE-specific search space.
- the common search space is monitored by all terminals in the cell, and the terminal specific search space is monitored by a specific terminal.
- the terminal monitors the common search space and / or the terminal specific search space according to the control information to be received.
- the number of CCE aggregation levels supported by the common search space is smaller than the number of CCE aggregation levels supported by the UE-specific search space.
- the common search space and the terminal specific space may overlap.
- a base station when a base station informs a user equipment of a radio resource through which a PDSCH is transmitted through a PDCCH, the base station transmits resource block (RB) allocation information in a frequency domain and separately allocates allocation information for an OFDM symbol in a time domain. I didn't send it.
- the radio resource in the time domain of the PDSCH in one subframe can be known according to the PDCCH size transmitted through the PCFICH.
- the PDCCH size is defined in the time domain and may mean, for example, the number of OFDM symbols used when the base station transmits the PDCCH to the UE.
- the term 'size' is used to mean the number of OFDM symbols in the time domain.
- a control channel such as a PDCCH transmitted by the base station to the relay station is referred to as "R-PDCCH”
- a data channel such as PDSCH transmitted by the base station to the relay station is referred to as "R-PDSCH”.
- the PDCCH and PDSCH transmitted by the base station to the macro terminal are referred to as 'macro PDCCH' and 'macro PDSCH', respectively.
- the PDCCH transmitted by the relay station to the relay terminal is referred to as a relay station PDCCH.
- the relay station transmits a control signal to the relay station terminal (eg, LTE terminal) during the first predetermined number of OFDM symbols of the subframe for backward compatibility with the LTE terminal and receives a signal from the base station for the remaining OFDM symbols of the subframe. Can be received.
- a subframe may be, for example, an MBMS Single Frequency Network (MBSFN) subframe of the 3GPP E-UTRA system. That is, the RS sets the subframe as the MBSFN subframe in relation to the RS, and then transmits a control signal to the RS through the RS PDCCH in some time domain of the MBSFN subframe and receives a signal from the BS in the remaining time domain. It is.
- MBSFN MBMS Single Frequency Network
- the size of the R-PDSCH is the size of the macro PDCCH, the size of the relay station PDCCH. It may vary depending on the size, guard time required according to switching of signal reception / transmission of the relay station.
- FIG. 6 illustrates an example of OFDM symbols in which a relay station may receive data according to the relay station PDCCH size in one subframe when the base station transmits data to the relay station.
- 6 (a) shows a subframe from the base station's point of view.
- 6 (b) shows a case where the relay station PDCCH size is one.
- the RS may receive a signal from the base station from OFDM symbol # 2 to OFDM symbol # 12 of the subframe.
- the RS needs to physically switch from the transmission mode to the reception mode in order to receive a signal from the base station after transmitting the relay station PDCCH in the OFDM symbol # 0 to the RS.
- Guard time (GT) is required to ensure this transition time. That is, OFDM symbol # 1 serves as a guard period.
- the OFDM symbol # 13 may serve as a guard interval when the RS needs to transmit a signal in the next subframe, for example, when the RS PDCCH needs to be transmitted to the RS.
- the RS transmits the RS PDCCH to the RS during the first two OFDM symbols of the subframe (OFDM symbols # 0 and # 1), leaves OFDM symbol # 2 as the guard period, and then operates from OFDM symbol # 3 to the OFDM symbol. Signals can be received from the base station up to # 12. OFDM symbol # 13 may serve as a guard interval.
- the base station and the relay station accurately synchronize starting positions of subframes with each other.
- the relay station and the base station are not correctly synchronized with the start position of the subframe, there may be a case where a delay of 0.5 OFDM symbol occurs, for example.
- FIG. 6 (d) illustrates a case where a delay of 0.5 OFDM symbols occurs and a relay station PDCCH size is 1
- FIG. 6 (e) illustrates a case where a delay of 0.5 OFDM symbols occurs and a relay station PDCCH size is two.
- the RS is a signal diagram transmitted in OFDM symbol # 13 corresponding to the last OFDM symbol of the subframe from the base station's point of view. Can be received.
- the guard periods 61, 62, 63, and 64 may be intervals smaller than one OFDM symbol, for example, 0.5 OFDM symbols.
- radio resources in the time domain in which the RS can receive the R-PDSCH may be variously changed. Accordingly, it may be difficult to accurately identify the radio resource region for receiving the R-PDSCH based on radio resources in the frequency domain where the RS can receive the R-PDSCH, for example, allocation information for the resource block.
- FIG. 7 and 8 illustrate examples of allocating radio resources to transmit an R-PDSCH in a subframe from a base station.
- the indexes of the OFDM symbols of the subframe are shown from # 0 to # 13.
- FIG. 7 and FIG. 8 it is assumed that the subframe at the RS is 0.5 OFDM symbols delayed from the subframe at the BS (thereby, the RS may receive a signal even in the OFDM symbol # 13).
- relay station 1 (RS 1) and relay station 4 (RS 4) have relay station PDCCH sizes of 1
- relay station 2 (RS 2) and relay station 3 (RS 3) have relay stations PDCCH sizes of 2.
- FIG. 7 shows that the macro PDCCH size is 2, and FIG. 8 has a macro PDCCH size of 3.
- FIG. 7 shows that the macro PDCCH size is 2
- FIG. 8 has a macro PDCCH size of 3.
- the R-PDSCH may be received in the OFDM symbol # 2 in the case of the relay station 1 and the relay station 4, but in the case of the relay station 1 and the relay station 4 in the relay station 4, the R-PDSCH may not be received in the OFDM symbol # 2. This is because the base station transmits the macro PDCCH in OFDM symbol # 2.
- the macro PDCCH size is 3, but the macro PDCCH size may be 4 when the downlink frequency band of the base station is 10 RB or less.
- OFDM symbol # 3 may then be used for macro PDCCH transmission of the base station. In this case, regardless of the size of the relay station PDCCH, that is, even when the relay station PDCCH size is 1 or 2, the relay station cannot receive the R-PDCCH and the R-PDSCH in the OFDM symbol # 3.
- the start position of the OFDM symbol in which the R-PDCCH is transmitted in an embodiment of the present invention. Can be limited. That is, irrespective of the size of the relay station PDCCH, i) if the frequency band size used by the base station for the backhaul downlink transmission is larger than 10 RB, the R-PDCCH is transmitted using the OFDM symbols after the OFDM symbol # 3. That is, the start position of the OFDM symbol to which the R-PDCCH is transmitted is OFDM symbol # 3.
- the R-PDCCH is transmitted using the OFDM symbols after the OFDM symbol # 4. That is, the start position of the OFDM symbol to which the R-PDCCH is transmitted is OFDM symbol # 4.
- the R-PDCCH may be transmitted using OFDM symbols after OFDM symbol # 4 regardless of the frequency band size used by the base station for backhaul downlink transmission. That is, the start position of the OFDM symbol to which the R-PDCCH is transmitted is OFDM symbol # 4.
- the OFDM symbol (for example, the OFDM symbol #) located before the OFDM symbol in which the R-PDCCH is transmitted according to the size of the RS PDCCH and the size of the macro PDCCH. 2 or OFDM symbol # 3) may be transmitted in the R-PDSCH.
- an R-PDSCH may be transmitted in OFDM symbol # 2.
- FIG. 9 shows a data receiving method of a relay station according to an embodiment of the present invention.
- the relay station transmits relay station PDCCH information to the base station (S100).
- the relay station PDCCH information may be a relay station PDCCH size for a subframe in which the relay station receives a signal from the base station, and may inform the base station through a higher layer signal.
- the subframe in which the relay station receives a signal from the base station may be a subframe set by the relay station as the MBSFN subframe in the access link between the relay station terminals.
- the relay station may inform the base station whenever the relay station PDCCH size of the MBSFN subframe is changed.
- the RS may transmit the RS PDCCH size through a higher layer signal with a predetermined period.
- the period for transmitting the relay station PDCCH information may have a unique value for each relay station or have a value common to all relay stations in the cell. If each relay station has a unique value, it is possible to have the base station transmits information on the period through the higher layer signal to each relay station. If it has a value common to all the relay stations in the cell, the information on the period may be transmitted by the base station through a broadcast channel in the form of system information or transmitted to each relay station through a higher layer signal.
- the relay station receives radio resource allocation information from the base station (S200).
- the radio resource allocation information may include resource block allocation information in the frequency domain for the R-PDSCH as well as OFDM symbol allocation information in the time domain.
- the radio resource allocation information may be transmitted to the relay station through the R-PDCCH.
- the start position of the OFDM symbol in which the R-PDCCH is transmitted may be limited.
- the R-PDCCH may be received in predetermined OFDM symbols in a subframe.
- a new DCI format including a macro PDCCH size value may be defined. For example, in case of RS 1 in FIG. 7 and FIG. 8, it is determined whether OFDM symbol # 2 can be used for R-PDSCH transmission according to the macro PDCCH size. Accordingly, by transmitting the macro PDCCH size value to the RS through the new DCI format, it is possible to indicate whether OFDM symbol # 2 is used for R-PDSCH transmission. In this case, if the macro PDCCH size value is 1 or 2, OFDM symbol # 2 is used for R-PDSCH transmission. If the macro PDCCH size value is 3, OFDM symbol # 2 is not used for R-PDSCH transmission. The above-described example is also true when the start position of the R-PDCCH is OFDM symbol # 3 or the start position of the R-PDCCH is OFDM symbol # 4.
- the radio resource allocation information when radio resource allocation information is transmitted through the R-PDCCH, the radio resource allocation information may include information indicating whether R-PDSCH is allocated to a specific OFDM symbol. For example, in FIG. 7, in case of RS 1 and RS 4, the allocation information for OFDM symbol # 2 may be added to the resource block allocation information by 1 bit.
- R-PCFICH when there is an R-PCFICH indicating the R-PDCCH size, not only the R-PDCCH size but also the macro PDCCH size may be notified through the R-PCFICH.
- R-PCFICH means PCFICH transmitted to the relay station.
- FIG. 10 shows an example of radio resource allocation in a subframe when there is an R-PCFICH indicating the R-PDCCH size.
- the relay station determines whether the R-PDSCH can be transmitted through, for example, OFDM symbol # 2 or OFDM symbol # 3 according to the macro PDCCH size value. It can be seen. In addition, since the base station receives and knows the relay station PDCCH size from the relay station, the base station can know whether the R-PDSCH may be transmitted in the OFDM symbol # 2 or the OFDM symbol # 3.
- the PCFICH indicating the macro PDCCH size may be allocated in the region in which the R-PDCCH is transmitted regardless of the presence or absence of the R-PCFICH, thereby informing the relay station of the macro PDCCH size. That is, a method of utilizing the PCFICH transmitted to the macro terminal without defining the R-PCFICH transmitted to the relay station.
- the subframes allocated by the base station to the backhaul downlink may be limited to a macro PDCCH size for a predetermined period and may be notified to each relay station through an upper layer signal.
- the period for defining the macro PDCCH size and the macro PDCCH size at that time may be transmitted through a unicast channel specific to the relay station, or may be transmitted through a broadcast channel to all relay stations in the cell.
- the relay station receives data from the base station through the R-PDSCH indicated by the received radio resource allocation information (S300).
- FIG. 11 shows an example of radio resource allocation between a base station and a relay station according to another embodiment.
- the R-PDCCH is also transmitted in the frequency band 111 allocated to the R-PDSCH transmitted to the relay station 1.
- the frequency bands 112 and 113 allocated to the R-PDSCH transmitted to the relay station 2 there is a frequency band in which only the R-PDSCH is transmitted, and there are also frequency bands in which the R-PDSCH and R-PDCCH are transmitted.
- resource blocks allocated to any RS are classified into resource blocks in which R-PDCCH transmission is performed in a specific OFDM symbol and resource blocks in which only R-PDSCH transmission is performed without R-PDCCH transmission.
- the radio resource allocation information transmitted from the base station to the relay station includes information on whether R-PDCCH transmission is performed in the allocated resource block together with the allocation information of the resource block and information on OFDM symbols in which the R-PDCCH transmission is performed. It may include.
- the base station informs the relay station of the R-PDCCH size through the R-PCFICH or higher layer signal (even if the relay station implicitly knows the R-PDCCH size or the R-PDCCH size is specified).
- the R-PDSCH may transmit additional information of 1 bit size indicating whether R-PDCCH transmission is performed in the allocated resource block together with the resource block allocation information for transmitting the R-PDSCH.
- the RS knows in advance that the start position of the R-PDCCH is OFDM symbol # 3, the R-PDCCH size is 2 through radio resource allocation information, and the OFDM symbol # 3, OFDM in the allocated resource block. It can be seen whether symbol # 4 has been allocated for R-PDSCH transmission or for R-PDCCH transmission.
- the R-PDCCH size is added to the radio resource allocation information in addition to the 1-bit additional information indicating the existence of the resource block allocation information and the R-PDCCH. It may contain informative information.
- Such radio resource allocation information may be transmitted through a new DCI format.
- the new DCI format may include resource block allocation information, a 1-bit additional information field indicating whether R-PDCCH transmission is performed in the allocated resource block, and a field indicating R-PDCCH size.
- the field indicating the R-PDCCH size may be transmitted only when there is an R-PDCCH or may be transmitted regardless of the presence or absence of the R-PDCCH (in this case, if the R-PDCCH does not exist, the R-PDCCH size is notified). Field value can be defined as 0).
- the RS may receive the R-PDSCH through the remaining OFDM symbols except for the OFDM symbol in which the R-PDCCH is transmitted in the resource block indicated by the resource block allocation information.
- the radio resource allocation information for the R-PDSCH may be transmitted through another DCI format including resource block allocation information and a bitmap field for OFDM symbols for which R-PDSCH transmission is performed.
- RS 1 may receive R-PDSCH in a total of 9 OFDM symbols from OFDM symbol # 5 to OFDM symbol # 13 in the allocated frequency band 111.
- the allocated frequency band may be known through resource block allocation information, and information on an OFDM symbol capable of receiving an R-PDSCH may be performed by a bitmap field value.
- the bitmap field may consist of 9 bits.
- an OFDM symbol to which an R-PDSCH is transmitted may be given a value of '1', and an OFDM symbol to which an R-PDSCH is not transmitted may be set to '0' (or vice versa).
- the allocated frequency band 113 can be known through resource block allocation information, and the OFDM symbol to which the R-PDSCH is transmitted can be known through a bitmap field value.
- the bitmap field may consist of 11 bits.
- the radio resource allocation information for the R-PDSCH may be transmitted through a DCI format including resource block allocation information and a field indicating an index of an OFDM symbol at which R-PDSCH transmission starts.
- the RS can know the start position of the R-PDSCH transmission using the index field value of the OFDM symbol at which the R-PDSCH transmission is started in the RB identified by the resource block allocation information.
- FIG. 12 shows an example of allocating radio resources for transmitting an R-PDSCH in a subframe from a base station perspective according to an embodiment of the present invention.
- a subframe at the RS is delayed by 0.5 OFDM symbol than the subframe at the BS.
- the relay station can also receive a signal from the base station in OFDM symbol # 13.
- the base station may transmit an R-PDCCH in the second slot.
- the base station may transmit the R-PDCCH transmitted to the relay station 1 (RS 1) or the relay station 2 (RS 2) through the first N of the second slot, for example, three OFDM symbols.
- N may be an integer of any one, two, or three.
- the base station may transmit the R-PDSCH in the remaining OFDM symbols except for OFDM symbols for transmitting the R-PDCCH and OFDM symbols for transmitting the macro PDCCH.
- the relay station first transmits relay station PDCCH information to the base station.
- the base station can know the relay station PDCCH size through the relay station PDCCH information.
- the base station can know the OFDM symbols from which the relay station can receive the R-PDSCH.
- the base station transmits radio resource allocation information through the R-PDCCH.
- the R-PDCCH is transmitted through a predetermined OFDM symbol, that is, the first N OFDM symbols of the second slot in this embodiment.
- the radio resource allocation information may include resource block allocation information in the frequency domain for the R-PDSCH as well as OFDM symbol allocation information in the time domain.
- the RS may inform the RS not only of the R-PDCCH size but also of the macro PDCCH size through the R-PCFICH.
- the relay station receives the R-PDSCH in the radio resource region determined through the radio resource allocation information. It is apparent that the methods described with reference to FIGS. 10 to 11 may also be applied to this embodiment in which the RS receives the R-PDCCH in the second slot of the subframe.
- the base station 500 includes a processor 510, a memory 530, and an RF unit 520.
- the processor 510 generates radio resource allocation information for a subframe that transmits a signal to the RS.
- the radio resource allocation information may include resource block allocation information in the frequency domain to which the R-PDSCH transmitting data to the relay station is allocated and OFDM symbol allocation information in the time domain.
- the memory 530 is connected to the processor 510 and stores various information for driving the processor 510.
- the RF unit 520 is connected to the processor 510 to transmit and / or receive a radio signal.
- the relay station 600 includes a processor 610, a memory 620, and an RF unit 630.
- the processor 610 obtains radio resource allocation information from the base station, and receives data through the R-PDSCH transmitted in the radio resource region indicated by the radio resource allocation information.
- the processor 610 transmits the relay PDCCH information to the base station.
- the memory 620 is connected to the processor 610 and stores various information for driving the processor 610.
- the RF unit 630 is connected to the processor 610 to transmit and / or receive a radio signal.
- Processors 510 and 610 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices.
- the memories 520 and 620 may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media and / or other storage devices.
- the RF unit 530 and 630 may include a baseband circuit for processing a radio signal.
- the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function. Modules may be stored in the memory 520, 620 and executed by the processors 510, 610.
- the memories 520 and 620 may be inside or outside the processors 510 and 610, and may be connected to the processors 510 and 610 by various well-known means.
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Abstract
Description
Claims (10)
- 주파수 영역에서 복수의 자원블록을 포함하고, 시간영역에서 복수의 OFDM 심볼을 포함하는 서브프레임에 기반한 무선통신 시스템에서 중계국의 데이터 수신방법에 있어서,기지국으로부터 R-PDCCH(Relay-Physical downlink Control Channel)를 통해 무선자원 할당정보를 수신하는 단계; 및상기 무선자원 할당정보가 지시하는 R-PDSCH(Relay-Physical Downlink Shared Channel)를 통해 상기 기지국으로부터 데이터를 수신하는 단계를 포함하되, 상기 무선자원 할당정보는 주파수 영역에서 자원블록의 할당정보 및 시간 영역에서 OFDM 심볼의 할당정보를 포함하는 것을 특징으로 하는 방법.
- 제 1 항에 있어서, 상기 R-PDCCH는 서브프레임에서 미리 정해진 OFDM 심볼들에서 수신하는 것을 특징으로 하는 방법.
- 제 1 항에 있어서, 상기 무선자원 할당정보를 수신하기 전에상기 중계국이 상기 기지국으로 중계국 PDCCH 정보를 전송하는 단계를 더 포함하되, 상기 중계국 PDCCH 정보는 상기 데이터를 수신하는 서브프레임 내에서 상기 중계국이 중계국 단말에게 제어 신호를 전송하는 OFDM 심볼 개수인 것을 특징으로 하는 방법.
- 제 1 항에 있어서, 상기 시간 영역에서 OFDM 심볼의 할당정보는 매크로 PDCCH 정보를 포함하되, 상기 매크로 PDCCH 정보는 상기 기지국이 매크로 단말에게 제어 신호를 전송하는 OFDM 심볼 개수인 것을 특징으로 하는 방법.
- 제 1 항에 있어서, 상기 무선자원 할당정보는 상기 R-PDSCH가 할당되는 자원블록 및 상기 자원블록에서 상기 R-PDCCH가 전송되는지 여부를 지시하는 정보를 포함하는 것을 특징으로 하는 방법.
- 제 1 항에 있어서, 상기 R-PDCCH가 전송되는 OFDM 심볼의 개수가 서브프레임 별로 동적으로 변화하는 경우, 상기 무선자원 할당정보는 상기 자원블록에서 R-PDCCH가 전송되는지 여부 및 상기 R-PDCCH가 전송되는 OFDM 심볼의 개수에 대한 정보를 더 포함하는 것을 특징으로 하는 방법.
- 제 1 항에 있어서, 상기 무선자원 할당정보는 상기 R-PDSCH 전송이 시작되는 OFDM 심볼의 서브프레임 내 인덱스 값을 포함하는 것을 특징으로 하는 방법.
- 제 1 항에 있어서, 상기 무선자원 할당정보는 상기 R-PDSCH가 전송되는 각 OFDM 심볼의 개수와 동일한 개수의 비트(bit)로 구성되는 비트맵(bitmap)을 포함하는 것을 특징으로 하는 방법.
- 무선신호를 송수신하는 RF부; 및상기 RF부에 연결되는 프로세서를 포함하되,상기 프로세서는 기지국으로부터 R-PDCCH(Relay-Physical downlink Control Channel)를 통해 무선자원 할당정보를 수신하고, 상기 무선자원 할당정보가 지시하는 R-PDSCH(Relay-Physical Downlink Shared Channel)를 통해 상기 기지국으로부터 데이터를 수신하되, 상기 무선자원 할당정보는 주파수 영역에서 자원블록의 할당정보 및 시간 영역에서 OFDM 심볼의 할당정보를 포함하는 것을 특징으로 하는 중계국.
- 제 9 항에 있어서, 상기 프로세서는 상기 무선자원 할당정보를 수신하기 전에 상기 기지국으로 중계국 PDCCH 정보를 전송하되, 상기 중계국 PDCCH 정보는 상기 데이터를 수신하는 서브프레임 내에서 상기 프로세서가 중계국 단말에게 제어 신호를 전송하는 OFDM 심볼 개수인 것을 특징으로 하는 중계국.
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US16/011,190 US10193614B2 (en) | 2009-03-03 | 2018-06-18 | Data-receiving method and apparatus for relay station in wireless communication system |
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US10193614B2 (en) | 2019-01-29 |
KR20100099655A (ko) | 2010-09-13 |
US20170104519A1 (en) | 2017-04-13 |
EP2405592A4 (en) | 2017-04-26 |
WO2010101366A3 (ko) | 2010-11-25 |
CN102342035A (zh) | 2012-02-01 |
US10044430B2 (en) | 2018-08-07 |
US20110317610A1 (en) | 2011-12-29 |
CN102342035B (zh) | 2014-07-16 |
EP2405592A2 (en) | 2012-01-11 |
US9553655B2 (en) | 2017-01-24 |
US20180302146A1 (en) | 2018-10-18 |
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