WO2010120159A2 - 중계기에서 harq ack/nack 피드백 신호 검출 방법 - Google Patents
중계기에서 harq ack/nack 피드백 신호 검출 방법 Download PDFInfo
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- WO2010120159A2 WO2010120159A2 PCT/KR2010/002426 KR2010002426W WO2010120159A2 WO 2010120159 A2 WO2010120159 A2 WO 2010120159A2 KR 2010002426 W KR2010002426 W KR 2010002426W WO 2010120159 A2 WO2010120159 A2 WO 2010120159A2
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- repeater
- nack
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- feedback signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1854—Scheduling and prioritising arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L2001/0092—Error control systems characterised by the topology of the transmission link
- H04L2001/0097—Relays
Definitions
- the present invention relates to a wireless communication system, and more particularly, to a method for detecting a HARQ ACK / NACK feedback signal and a repeater device using the same.
- a relay node When the channel state between the base station and the terminal is poor, a relay node (RN) may be installed between the base station and the terminal to provide a wireless channel having a better channel state to the terminal.
- RN relay node
- the repeater is currently widely used as a technique introduced for eliminating the radio shadow area in a wireless communication system.
- the relay has evolved into a more intelligent form than the repeater's ability to simply amplify and transmit the signal.
- the repeater technology is a technology necessary for reducing the base station expansion cost and the backhaul network maintenance cost in the next generation mobile communication system, while expanding service coverage and improving data throughput. As the repeater technology gradually develops, it is necessary to support the repeater used in the conventional wireless communication system in the new wireless communication system.
- the role of forwarding link connection between a base station and a terminal in a repeater is introduced, and two types of links having different attributes are applied to each uplink and downlink carrier frequency band. do.
- the part of the connection link established between the link between the base station and the repeater is defined as a backhaul link.
- the transmission is performed by the frequency division duplex (FDD) or the time division duplex (TDD) using the downlink resources, and is called backhaul downlink, and the transmission is performed by the FDD or TDD using the uplink resources. This may be expressed as a backhaul uplink.
- FDD frequency division duplex
- TDD time division duplex
- FIG. 1 is a diagram illustrating the configuration of a relay backhaul link and a relay access link in a wireless communication system.
- a repeater may receive information from a base station through a relay backhaul downlink and transmit information to the base station through a relay backhaul uplink.
- the repeater may transmit information to the terminal through the relay access downlink, and may receive information from the terminal through the relay access uplink.
- LTE-A LTE-Advanced
- the base station needs to give ACK / NACK feedback to the repeater for uplink transmission to the base station of the repeater.
- LTE-A LTE-Advanced
- no design and proposal for a method of transmitting an ACK / NACK feedback and a channel allocation for ACK / NACK feedback of an uplink transmission of a repeater in the LTE-A system have been presented.
- An object of the present invention is to provide a HARQ ACK / NACK feedback signal detection method of a repeater.
- Another object of the present invention is to provide a repeater apparatus for detecting a HARQ ACK / NACK feedback signal.
- the HARQ ACK / NACK feedback signal from the base station is transmitted from the start point of the specific channel and the start point of the specific channel
- Receiving specific channel configuration information including offset information indicating a position of a specific channel allocated exclusively for the repeater within a specific channel Receiving a HARQ ACK / NACK feedback signal for uplink transmission of the repeater from the base station; And detecting the repeater specific channel based on the received specific channel configuration information and decoding the received HARQ ACK / NACK feedback signal.
- the method for detecting a HARQ ACK / NACK feedback signal of the repeater comprises the steps of: receiving code index information preset for the HARQ ACK and / or HARQ NACK signal from the base station; And determining whether the received HARQ ACK / NACK feedback signal is ACK or NACK based on the code index information and the code index applied to the received HARQ ACK / NACK feedback signal.
- a repeater device is dedicated to the repeater device within the specific channel from a start point of a specific channel through which the HARQ ACK / NACK feedback signal is transmitted from a base station and the start point of the specific channel.
- a radio frequency (RF) unit for receiving specific channel configuration information including offset information indicating a position of an assigned specific channel and receiving an HARQ ACK / NACK feedback signal for uplink transmission of the repeater from the base station;
- a processor for detecting the specific channel dedicated to the repeater device based on the received specific channel configuration information and decoding the received HARQ ACK / NACK feedback signal.
- the RF unit further receives code index information preset for said HARQ ACK and / or said HARQ NACK signal from said base station, and said processor receives said code index information and said received HARQ ACK / NACK feedback signal. It may be determined whether the received HARQ ACK / NACK feedback signal is ACK or NACK based on the code index applied to the.
- the repeaters in the LTE-A system can efficiently receive the HARQ ACK / NACK feedback signal of the base station for the uplink transmission.
- the repeater can efficiently receive the HARQ ACK / NACK feedback signal according to the new HARQ ACK / NACK channel structure and transmission method for the repeater proposed in the present invention.
- FIG. 1 is a diagram showing the configuration of a relay backhaul link and a relay access link in a wireless communication system
- FIG. 2 is a diagram illustrating a structure of a specific uplink subframe when uplink data transmission is in a PRB index unit and a region of a PHICH in a specific downlink subframe corresponding to a PRB index in the LTE system;
- FIG. 3 is a diagram illustrating an example of a configuration of a downlink subframe in a base station and a repeater in the case of a fake-MBSFN subframe;
- FIG. 4 is an allocation of an R-PHICH channel for transmitting a HARQ ACK / NACK (Hybrid Automatic Repeat reQuest ACKnowledgement / Negative ACKnowledgement) signal by a base station for uplink backhaul subframe structure and uplink transmission of a repeater in LTE-A system Showing a structure of a specific downlink backhaul subframe,
- HARQ ACK / NACK Hybrid Automatic Repeat reQuest ACKnowledgement / Negative ACKnowledgement
- FIG. 5 is a diagram illustrating an example of a backhaul subframe structure including an R-PDCCH for a repeater
- FIG. 6 is a diagram illustrating an example of a backhaul subframe structure including a backhaul resource for a relay
- FIG. 7 is a diagram showing the components of the apparatus 50 according to the invention.
- a terminal collectively refers to a mobile or fixed user terminal device such as a user equipment (UE), a mobile station (MS), an advanced mobile station (AMS), and the like.
- the base station collectively refers to any node of the network side that communicates with the terminal such as a Node B, an eNode B, a Base Station, and an Access Point (AP).
- the repeater may be referred to as a relay node (RN), a relay station (RS), a relay, and the like.
- a user equipment may receive information from a base station through downlink, and the terminal may also transmit information through uplink.
- the information transmitted or received by the terminal includes data and various control information, and various physical channels exist according to the type and purpose of the information transmitted or received by the terminal.
- the base station uses a physical downlink control channel (PDCCH) of a downlink subframe for HARQ ACK / NACK (abbreviated as 'ACK / NACK') feedback for uplink PUSCH transmission of a UE.
- a downlink HARQ ACK / NACK may be transmitted through a physical HARQ indicator channel (PHICH: physical channel indicator CHannel, hereinafter referred to as 'PHICH') allocated to a control channel (hereinafter, referred to as 'PDCCH') region.
- PHICH physical channel indicator CHannel
- 'PDCCH' control channel
- Allocating a dedicated HARQ ACK / NACK channel for all UEs in a specific cell has a problem of increasing resource overhead in downlink. That is, downlink HARQ ACK / NACK channel resources allocated to a terminal that does not actually perform uplink transmission to the base station through the PUSCH of the uplink subframe are wasted.
- a PHICH is allocated based on a PUSCH transmission actually occurring.
- ACK / NACK feedback for one code block based on a physical resource block (PRB) index of a PUSCH used by a terminal for uplink transmission
- PRB physical resource block
- An orthogonal PHICH entity in the time, frequency, and code domain where signaling is possible is secured, and a PHICH of one subframe may be configured as a set of corresponding PHICH entities.
- FIG. 2 is a diagram illustrating a structure of a specific uplink subframe when uplink data transmission is in a PRB index unit and a region of a PHICH in a specific downlink subframe corresponding to a PRB index in the LTE system.
- the base station transmits downlink HARQ ACK / NACK feedback for the terminal on which uplink transmission is performed through a PHICH entity mapped corresponding to each PRB index in the PUSCH used by the terminal.
- HARQ ACK / NACK feedback is performed through a PHICH index corresponding to the lowest PRB index.
- the base station may perform ACK / NACK feedback through a PHICH entity mapped to PRB index 2.
- FIG. 2 illustrates a case where uplink transmission is performed in units of a PRB index, the same case may be applied to a case of performing a unit of VRB index.
- FIG. 3 is a diagram illustrating an example of a configuration of a downlink subframe in a base station and a repeater in the case of a fake-MBSFN subframe.
- the repeater controls information, etc., to lower UEs through a PDCCH occupying two Orthogonal Frequency Division Multiplexing (OFDM) symbols in a downlink subframe configured as a fake-MBSFN subframe. Can be transmitted.
- OFDM Orthogonal Frequency Division Multiplexing
- a transition gap third OFDM symbol, fourth quarter OFDM symbol required for switching from a transmission mode to a reception mode is required.
- the repeater may receive data and the like from the base station through the 4th to 11th OFDM symbol intervals (9 OFDM symbols in total).
- each repeater may not receive downlink Acknowledgment / Negative Acknowledgement (ACK / NACK) feedback, which is a response to whether the uplink backhaul link transmission to the base station is successfully received, through the PHICH in the fake-MBSFN subframe. Therefore, in the LTE-A (LTE-Advanced) system, a downlink ACK / NACK feedback channel for the repeater needs to be additionally defined for the backhaul link.
- ACK / NACK downlink Acknowledgment / Negative Acknowledgement
- a downlink control channel structure according to a downlink backhaul link structure and an ACK / NACK channel are allocated.
- Orthogonal resources in time, frequency, and code domains are allocated for each resource block (RB) index used for transmission of a conventional physical uplink shared channel (PUSCH). It is possible to consider a method of allocating a RN-specific downlink ACK / NACK channel out of the structure of the PHICH.
- a backhaul subframe for transmitting / receiving downlink / uplink backhaul traffic may be allocated to support a repeater in the LTE-A system, and backhaul traffic transmission and reception between the base station and the repeater are performed through the corresponding downlink / uplink backhaul subframe.
- a new downlink control channel (R-PDCCH) for the repeater Relay-PDCCH, hereinafter referred to as 'R-PDCCH' needs to be defined.
- R-PDCCH new downlink control channel for the repeater
- Relay-PDCCH hereinafter referred to as 'R-PDCCH' needs to be defined.
- a new downlink control channel for the repeater is referred to below as R-PDCCH, but may be referred to as another form.
- the base station may transmit downlink / uplink scheduling information and downlink HARQ ACK / NACK feedback for the repeater to the repeater through the newly defined R-PDCCH for the repeater.
- the backhaul link characteristics between the base station and the repeater may be different from the access link characteristics between the base station (or repeater) and the terminal.
- the traffic on the backhaul link is likely to exist in the backhaul subframe assigned to each repeater.
- the traffic transmitted through the backhaul link is aggregated traffic for the terminals supported by the repeater, the traffic may be large in terms of traffic volume.
- the backhaul traffic transmitted by each of the repeaters is called uplink access link traffic and frequency division multiplexing (FDM) transmitted by terminals directly connected to the macro cell base station. Is likely to be sent in
- the uplink backhaul subframe does not necessarily mean that the PRBs in all PUSCHs are used for the uplink backhaul transmission of the repeaters. For this reason, it may be more efficient to allocate a dedicated HARQ ACK / NACK channel for each repeater than to allocate the PHICH resource for the repeater for each PRB index of the PUSCH, as the resources for the PHICH are allocated in the existing LTE system. That is, the downlink HARQ ACK / NACK channel for the repeater may be configured as a set of dedicated HARQ ACK / NACK channel for each repeater.
- the dedicated HARQ ACK / NACK channel allocated for each repeater is called and used as an R-PHICH. However, it may be called other forms.
- FIG. 4 illustrates a structure of a specific downlink backhaul subframe to which an R-PHICH channel is allocated for transmitting a HARQ ACK / NACK signal by a base station for uplink transmission of a repeater and an uplink backhaul subframe in an LTE-A system. The figure shown.
- an R-PUSCH for uplink data transmission may be allocated to each repeater in a specific uplink backhaul subframe. That is, R-PUSCH may be allocated to repeater 1, repeater 2, repeater 3,..., Repeater N, respectively.
- the R-PUSCH allocated for the repeater may be allocated in the PUSCH in the LTE system.
- the R-PUSCH allocated to each repeater may be allocated to different frequency bands.
- the downlink backhaul subframe illustrated in FIG. 4B is a subframe corresponding to HARQ timing for uplink backhaul transmission through the specific uplink backhaul subframe illustrated in FIG. 4A.
- one R-PHICH entity may be dedicated to one repeater, and the number of R-PHICH entities constituting the R-PHICH is the number of repeaters supported by the backhaul subframe to which the R-PHICH is allocated. Same as count.
- the R-PHICH entities corresponding to each repeater may be orthogonally allocated to each other in time, frequency, and code domains.
- the base station may inform each repeater of information on dedicated R-PHICH entity allocation through higher layer signaling during an initial setup process or an update process. That is, each repeater may configure a downlink HARQ ACK / NACK channel for uplink backhaul transmission by receiving RRC (Radio Resource Control) signaling.
- the base station may inform the dedicated R-PHICH configuration information through the R-PDCCH, a broadcast channel for the repeater, or higher layer signaling.
- the R-PHICH configuration information may include the following contents. First, when the R-PHICH allocated to each repeater is located in the R-PDCCH, the R-PHICH configuration information transmitted by the base station will be described.
- One R-PHICH entity can have an implicitly fixed size in the time and frequency domain. For example, one R-PHICH entity may be allocated on three subcarriers and two OFDM symbols.
- the configuration information on the R-PHICH is the control channel element (CCE) index used as the R-PHICH in the R-PDCCH or the VRB / PRB index and R, which are starting points in the logical region / physical region of the R-PHICH. It may include size information of the PHICH.
- the R-PHICH configuration information may further include offset information for a location to which a dedicated R-PHICH entity for a corresponding relay is allocated from the starting point together with the starting point information of the R-PHICH.
- the R-PHICH configuration information may further include information on a code index for the R-PHICH.
- the information about the code index can be divided and informed by the code index for the ACK signal and the code index for the NACK signal, otherwise, it informs one code index for the ACK signal or NACK signal, in the case of the NACK or ACK signal It may be processed in a discontinuous transmission (DTx) mode.
- DTx discontinuous transmission
- one R-PHICH entity size may not have a fixed size implicitly in the time and frequency domain, but may have other sizes in several options.
- one R-PHICH entity may be assigned on six subcarriers and one OFDM symbol, and, alternatively, may be assigned on three subcarriers and two OFDM symbols.
- the configuration information for the R-PHICH is R in addition to the information included when the size of one R-PHICH entity described above is implicitly fixed size. It may further include information on the PHICH entity option.
- the base station may transmit the R-PHICH configuration information to each repeater through the R-PDCCH, a broadcast channel for the repeater, or higher layer signaling.
- the ACK / NACK feedback for each repeater may be distinguished in the code domain, and the code may be a cell identifier (ID) of the repeater or a C-RNTI (Cell-Radio Network Temporary ID) of the repeater in the macro cell. May be implicitly determined.
- ID cell identifier
- C-RNTI Cell-Radio Network Temporary ID
- the base station may allocate an R-PHICH entity for each repeater as described above.
- one repeater may transmit a plurality of code blocks to a base station in multiple layers through an uplink backhaul subframe.
- the base station may bundle one HARQ ACK / NACK feedback through the R-PHICH to feed back one ACK / NACK to the repeater. That is, as an example, when the base station successfully receives all of the plurality of code block transmissions, the base station may bundle one ACK signal and feed it back to the repeater.
- the base station may transmit the HARQ ACK / NACK signal through the R-PHICH through multiple layers in the same way as the uplink transmission.
- the base station may allocate one R-PHICH entity for each repeater as above, or allocate R-PHICH entities by the number of corresponding uplink code blocks. That is, one R-PHICH entity may be allocated to each layer in one repeater.
- a method of including a downlink HARQ ACK / NACK feedback field in a downlink grant or an uplink grant may be considered. That is, the base station includes a downlink HARQ ACK / NACK feedback field in a downlink or uplink grant field for the corresponding repeater included in the R-PDCCH of the downlink backhaul subframe configured for downlink HARQ ACK / NACK feedback timing. Can be sent to.
- the size of the downlink ACK / NACK field may vary depending on the number of code blocks.
- the number of code blocks can be increased by spatial multiplexing or by the repeater configuring wireless backhaul through carrier aggregation. That is, when the backhaul is configured through multiple carriers, the number of bits of the corresponding ACK / NACK resource increases, and the bits of the ACK / NACK resource may be represented by a bundle of bit fields of the grant.
- the bit field of the grant may be configured as a bit field allocated as a multiple of the number of carriers that may be scheduled component carriers instead of the number of scheduled component carriers.
- the number of HARQ ACK / NACK bits is small, or the number of HARQ ACK / NACK bits is large or the number of repeaters is small or large as carrier aggregation is performed.
- the number of bits of HARQ ACK / NACK that the base station actually needs to transmit is variable. For the variable amount of the number of bits of the HARQ ACK / NACK, a technique for separately defining HARQ ACK / NACK channels to inform the repeaters has been described above.
- a scheme in which the base station defines such a group of HARQ ACK / NACK as one codeword may be considered. That is, a HARQ ACK / NACK control codeword corresponding to a certain payload length may be defined, and a bit field used by a specific repeater may be shared in advance through a cooperative process between the base station and the repeater.
- the base station attaches a cyclic redundancy check (CRC) to the ACK / NACK bits of 28 bits to make 44 bits.
- CRC cyclic redundancy check
- the base station performs channel encoding (convolutional encoding or block encoding) by generating a payload by masking an ID in which the repeater and the base station can distinguish the repeater ACK / NACK codeword in the CRC.
- the base station can perform scrambling on the corresponding ACK / NACK codeword ID as a whole. Through the repeater ACK / NACK codeword ID it can be identified whether the ACK / NACK codeword assigned to them without error.
- the repeater may then decode the corresponding ACK / NACK codeword and define certain bit positions as uplink ACK / NACK codewords for uplink traffic transport blocks that it has transmitted (or for downlink traffic). This may be the case of an ACK / NACK codeword sent by the repeater).
- an ACK / NACK control codeword may be generated by tying ACK / NACK signals to be transmitted to a repeater on one carrier, but may be implemented in a form of tying ACK / NACK signals to be transmitted to a repeater for several uplink carriers.
- each repeater may distinguish an ACK / NACK signal for itself through different ACK / NACK bits indicated by the base station.
- the ACK / NACKs for one repeater may be transmitted in one ACK / NACK codeword.
- the ACK / NACK signals may be transmitted to the repeater using various ACK / NACK codewords.
- the bit field value is changed to 1 when the reception result at the base station for the uplink traffic transport block is received without error, or 0 when the NACK signal (or DTX if the NACK signal), or 0 and 1 Can be assigned.
- ACK / NACK codeword When defining an ACK / NACK codeword, it is necessary to define a channel for transmitting the corresponding ACK / NACK codeword. In the case of an ACK / NACK codeword, several repeaters simultaneously view one ACK / NACK codeword depending on the length of the payload, or one repeater may use all one ACK / NACK codeword. When one repeater uses one ACK / NACK codeword completely, it is desirable to define the optimal resource position for the repeater (frequency selective) and transmit the same.
- the ACK / NACK codeword needs a common control channel region in which the ACK / NACK codeword can be transmitted, and the position is used by the repeater in a blind decoding manner in a specific search region (especially with the CCE position).
- the blind decoding search region of the repeater may be multiplexed with other downlink or uplink shared channels in the form of frequency division multiplexing (FDM), and is divided into TDM and other control channels of the time division multiplexing (TDM) format. It is possible to take In addition, when the position of the blind decoding search area is changed in the area used by the repeater, the subcarrier set through which the ACK / NACK codeword is transmitted may be changed accordingly. However, in the configuration of such a control channel region, considering the ACK / NACK decoding latency at the repeater, the configuration of the control channel may be short burst, that is, some OFDM symbols (for example, in one subframe). , 1 to 3 OFDM symbols, or in some cases, the number of OFDM symbols may be three or more). In this case, the repeater may have sufficient time to process the ACK / NACK codeword and prepare for later transmission.
- FDM frequency division multiplexing
- TDM time division multiplexing
- FIG. 5 is a diagram illustrating an example of a backhaul subframe structure including an R-PDCCH for a repeater.
- the entire PDSCH may be divided into partitions configured by one or more PRB units.
- a specific partition can be dynamically used as a relay zone for backhaul link transmission or used as a PDSCH for macro terminals according to backhaul traffic volume for each relay, traffic volume for channel terminals, and channel quality. Can be.
- the R-PHICH allocation method according to the backhaul subframe structure will be briefly described.
- the base station can always fix a particular partition as a repeater zone for backhaul link transmission. As shown in FIG. 5, the base station may assign partition 1 and partition 2 as repeater zones for repeaters. In addition, when each repeater is initialized or updated, the base station may inform partition configuration information and information on a dedicated partition for the repeater zone through higher layer signaling.
- the base station may transmit the relay zone configuration information to each repeater through a specific partition. That is, the relay zone configuration information transmitted by the base station is a bitmap indication field for indicating whether each partition of the backhaul subframe is used as a relay zone or a PDSCH for macro terminals, and an R of a partition used as a relay zone. It may include configuration information of the PDCCH and the R-PDSCH (for example, the number of OFDM symbols allocated for the R-PDDCH).
- the configuration information of the repeater zone is transmitted through time division multiplexing (TDM) with the R-PDCCH and R-PDSCH, or a specific control channel element (CCE) or a combined control channel element of the R-PDCCH in a dedicated partition for the repeater zone.
- TDM time division multiplexing
- CCE specific control channel element
- FDM frequency division multiplexing
- the base station assigns dedicated R-PHICHs for all repeaters (eg, repeater 1 and repeater 2) supported through the corresponding backhaul subframe in the R-PDCCH region of a specific partition (eg, partition 2) for the repeater zone. Can be assigned.
- the base station may allocate each R-PHICH for a plurality of allocated repeaters in a time and frequency domain, and also assign a code (sequence) to be orthogonal.
- the base station may transmit such resource mapping and code mapping information to each repeater through higher layer signaling.
- the base station may apply a codeword based ACK / NACK feedback scheme to downlink HARQ ACK / NACK feedback for the repeater, and transmits the codeword based ACK / NACK feedback to the corresponding relay through a dedicated partition for the relay zone.
- the base station multiplexes the R-PHICH for ACK / NACK feedback codeword transmission in the form of time division multiplexing (TDM) with the R-PDCCH and R-PDSCH of the corresponding partition, or the specific control channel element (CCE) of the R-PDCCH.
- TDM time division multiplexing
- CCE specific control channel element
- the base station may transmit the R-PHICH resource mapping information in the partition to each relay through higher layer signaling.
- aggregated control channel elements aggregated CCEs
- FDM frequency division multiplexing
- the base station may transmit an ACK / NACK feedback field for uplink backhaul transmission of the corresponding repeater in downlink or uplink grant information for the repeater in the R-PDCCH instead of the R-PHICH.
- the base station may generate an ACK / NACK feedback code block, attach a CRC to the corresponding code block, perform a process of masking the repeater ID to the CRC, and then signal ACK / NACK feedback for the corresponding repeater. .
- the base station may transmit ACK / NACK feedback information for one repeater through one ACK / NACK feedback code block, or may transmit ACK / NACK feedback information for a plurality of repeaters.
- the base station may transmit a relay-physical control format indicator channel (R-PCFICH) through a logical region or a physical region start point of the R-PDCCH of the specific partition.
- R-PCFICH relay-physical control format indicator channel
- the base station may transmit the R-PCFICH at any fixed location in the R-PDCCH.
- the R-PCFICH may include information on the R-PDDCH size and the R-PHICH configuration of the corresponding partition.
- the R-PHICH configuration information of the corresponding partition may include the number of R-PHICH groups, the R-PHICH length, the number and ID of repeaters for which ACK / NACK feedback is performed through the R-PHICH of the corresponding partition. Through this, each relay can know the existence of R-PHICH and resource mapping information directed to itself in the corresponding partition.
- all relays that blank the access link transmission to the terminal and receive the backhaul link from the base station can confirm that the specific partition is used as the relay zone through the R-PCFICH.
- the base station attaches the CRC to the R-PCFICH and masks it with a cell common repeater ID so that all repeaters can decode it.
- the cell common repeater ID is a common ID shared by all repeaters attached to the macro cell, and the base station may transmit the cell common repeater ID to each repeater during initial setting such as network entry of the repeater.
- FIG. 6 is a diagram illustrating an example of a backhaul subframe structure including a backhaul resource for a repeater.
- a primary backhaul resource and a secondary backhaul resource may be allocated to each relay in a backhaul subframe having an index 3. That is, the base station may allocate primary backhaul resources to different frequency bands for the repeater 1, the repeater 2, and the repeater 3, respectively.
- the main backhaul resource for each repeater may include each repeater specific control channel (CCH) and backhaul data to each repeater.
- CCH repeater specific control channel
- R-PHICH and R-PDCCH downlink or uplink grant and TPC (Transmit Power Control) commands
- TDM time division multiplexed
- FDM frequency division multiplexed
- a mixture of TDM and FDM Multiplexed form can be transmitted.
- the base station sets up an R-PHICH group on the same resource elements (REs) and stores a plurality of R-PHICHs in an orthogonal sequence (eg, a Walsh sequence). You can consider multiplexing with).
- REs resource elements
- an orthogonal sequence eg, a Walsh sequence
- the base station transmits a specific subset of resource elements in a cell-specific (or repeater-common) search space for specific R-PHICH group transmission. It can be mapped and sent to the resource space.
- the specific subset of resource elements may have a cell-specifically semi-static fixed location, and the base station may transmit to each repeater through relay-specific or cell-specific RRC signaling.
- the base station preferably allocates the repeater-common search region in a semi-fixed form, but may be dynamically allocated in consideration of the scheduling gain of the terminal.
- the allocated resource is determined only by the total resource size, and the actual subset may vary according to the size of the relay-common search area.
- R-PHICH mapping for R-PUSCH transmission is implicitly mapped according to a specific resource block (RB) index (e.g., resource block index having the lowest index value) in which a R-PUSCH transmission is made in a specific relay.
- RB resource block index
- the base station may transmit the bundled ACK / NACK feedback to the repeater.
- the resource on which ACK / NACK is transmitted may be determined based on the RB index on which the downlink or uplink grant is transmitted.
- the base station When the repeater transmits multiple carriers or multiple codewords uplink, the base station continuously selects resources (i.e., R-PHICH) to be used for ACK / NACK feedback transmission by the number of corresponding multiple carriers or multiple codewords, So you can choose.
- resources i.e., R-PHICH
- the base station may allocate a repeater-specific R-PHICH for each repeater.
- the number of R-PHICHs allocated to a specific repeater is determined by the maximum number of code blocks that can be transmitted through the R-PUSCH and the corresponding ACK / NACK feedback scheme (individual ACK / NACK feedback for each code block) or bundling. It may be determined by whether or not the ACK / NACK feedback scheme is to be applied.
- ACK / NACK feedback scheme individual ACK / NACK feedback for each code block
- bundling It may be determined by whether or not the ACK / NACK feedback scheme is to be applied.
- the base station may inform each repeater of the repeater-specific R-PHICH allocation information through the repeater-specific RRC signaling.
- the resource allocation method for each repeater may determine the resource based on the ID of the repeater.
- the base station may transmit higher layer signaling or L1 / L2 signaling to the repeater.
- the above-described methods for setting resources for designated ACK / NACK transmission are applicable to the case where resources reserved for the repeater can be shared or selectively used by several repeaters.
- the R-PDCCH for a specific relay may be configured in a TDM or FDM scheme within the transmitted RBs or in a mixed scheme of TDM and FDM according to the number of RBs. have.
- R-PDCCH eg, a downlink / uplink grant or TPC command
- R-PHICH transmission is performed on a continuous or predefined specific OFDM symbol (s) of RBs or some of them.
- R-PHICH duration 2
- OFDM symbols at indexes 4 and 5 or OFDM symbol (s) of a predetermined specific index, for example, OFDM symbol indexes at indexes 11 and 12
- R-PHICH transmission is made.
- ACK / NACK feedback is performed on a plurality of code blocks
- ACK / NACK feedback on each code block may be transmitted by applying different orthogonal sequences. If there is an R-PHICH for the repeater, but there is no R-PDCCH, the base station may transmit a dummy R-PDCCH (dummy R-PDCCH) to the repeater, to inform the location of the R-PHICH.
- the ACK / NACK feedback of the base station for the uplink backhaul transmission of the repeater may be transmitted by being included in a downlink or uplink grant, and the base station may configure and transmit an R-PDCCH including only the ACK / NACK signal.
- the ACK / NACK for the uplink backhaul traffic depends on whether there is an R-PDCCH corresponding to an uplink grant or whether there is a downlink control information (DCI) format corresponding to an uplink grant, or a type of DCI format. This can be known by the classification, the decoding position of the R-PDCCH, and the like.
- DCI downlink control information
- the base station may transmit the R-PDCCH corresponding to the next uplink grant or may transmit a DCI format including no uplink grant.
- the repeater may know the ACK / NACK through blind decoding based on the physical region / logical region start positions of different R-PDCCHs (for example, the physical region / logical region start positions of the R-PDCCH may be ACK for CCE index of index 2, ACK for CCE index of 10).
- the base station selectively defines and transmits different DCI formats that may indicate an ACK / NACK state, thereby allowing the repeater to recognize the ACK / NACK signal by dividing the DCI format.
- the repeater can know the ACK / NACK by defining different values according to the ACK / NACK without defining different DCI formats. For example, when the base station allocates two IDs to one repeater, it can be seen that the first ID is ACK when the CRC is masked and transmitted, and the second is NACK when the second ID is CRC masked and transmitted.
- bundling may be applied or multiple ACK / NACK states may be informed by using a location of an R-PDCCH.
- the repeater may classify ACK / NACK for uplink backhaul data using grant information.
- MCS modulation and coding scheme
- RV redundancy version
- Another ACK / NACK indication method is ACK if the new data indicator (NDI) value is set to a new data transmission (i.e., if the NDI value changes) and is set to retransmission (i.e., the NDI value remains unchanged) If set to), it can be determined by NACK.
- the method of determining in this way is preferably applied when the number of codewords is one or the number of ACK / NACKs to be transmitted is one or ACK / NACKs are bundled.
- a downlink assignment index (DAI) value or an uplink index value may be used. These values are useful if they indicate that the NDI values are not new data values.
- a method of determining an ACK / NACK signal according to a bit pattern of a grant will be described.
- the remaining bits may be reconfigured for any other purpose. Therefore, a certain field can be simply reconfigured into bits for transmitting ACK / NACK signals, and the number of bits can be set to the number of ACK / NACK bits to be transmitted at once.
- the remaining unused bits are all set to a constant known value, and the bit fields usable in the retransmission state may be dynamically changed to transmit ACK / NACK signals.
- the base station may simultaneously transmit a downlink grant and an uplink grant.
- only valid grants may be defined among downlink grants and uplink grants, and only the remaining portions may be used as ACK / NACK bit fields.
- a bit field for determining whether a downlink grant or an uplink grant exists may be redefined. For example, if there are both downlink / uplink defined as 1 bit, the other one may be configured in a form in which only one of downlink and uplink is present. Alternatively, when 2 bits are configured, 1 bit may indicate that there is a downlink grant, and the remaining 1 bit may be configured to indicate that there is an uplink grant.
- a grant not used during the downlink or uplink grant may be reconfigured for the fields and used for ACK / NACK transmission as described above.
- an uplink grant for retransmission When the transmission mode of the repeater uplink backhaul traffic is asynchronous, an uplink grant for retransmission always needs to exist. Therefore, when a NACK signal is transmitted, the uplink grant is always transmitted together. In this case, detailed information about the NACK signal may follow the above description. However, in order to transmit the ACK / NACK signal in case of no grant while transmitting the ACK signal, the PDCCH should always be transmitted. If there is no uplink scheduling, an R-PDCCH having only ACK information without grant information may be defined.
- an uplink grant for retransmission is generally not transmitted.
- an uplink grant may be transmitted for ACK / NACK signal transmission and configured in the above-described form.
- the ACK / NACK information may be included in the downlink grant and transmitted, which may be configured like the implicit indication method of the above-described grant.
- a blind detection method for detecting a specific ACK / NACK signal needs to be defined. In this case, since blind decoding complexity increases, it is preferable to transmit a dummy grant during a downlink grant or an uplink grant and to transmit an ACK / NACK signal to the corresponding grant.
- FIG. 7 is a diagram showing the components of the apparatus 50 according to the invention.
- the apparatus 50 may be a terminal or a base station.
- the device 50 includes a processor 51, a memory 52, a radio frequency unit (RF unit) 53, a display unit 54, and a user interface unit 55.
- RF unit radio frequency unit
- Layers of the air interface protocol are implemented in the processor 51.
- the processor 51 provides a control plan and a user plan.
- the function of each layer may be implemented in the processor 51.
- Memory 52 is coupled to processor 51 to store operating systems, applications, and general files.
- the display unit 54 displays various information and may use well-known elements such as a liquid crystal display (LCD) and an organic light emitting diode (OLED).
- LCD liquid crystal display
- OLED organic light emitting diode
- the user interface unit 55 may be composed of a combination of well known user interfaces such as a keypad, a touch screen, and the like.
- the RF unit 53 may be connected to the processor 51 to transmit and receive a radio signal.
- the RF unit 53 may be divided into a processor transmission module (not shown) and a reception module (not shown).
- the layers of the air interface protocol between the terminal and the network are based on the lower three layers of the open system interconnection (OSI) model, which is well known in a communication system, for the first layer L1, the second layer L2, and the third layer. Can be classified as (L3).
- the physical layer belongs to the first layer and provides an information transmission service through a physical channel.
- the radio resource control (RRC) layer belongs to the third layer and provides control radio resources between the terminal and the network. The terminal and the network exchange RRC messages through the RRC layer.
- each component or feature is to be considered optional unless stated otherwise.
- Each component or feature may be embodied in a form that is not combined with other components or features. It is also possible to combine some of the components and / or features to form an embodiment of the 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. It is obvious that the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship in the claims or as new claims by post-application correction.
- Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof.
- an embodiment of the present invention may include one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), FPGAs ( Field Programmable Gate Arrays), processors, controllers, microcontrollers, microprocessors, and the like.
- ASICs Application Specific Integrated Circuits
- DSPs Digital Signal Processors
- DSPDs Digital Signal Processing Devices
- PLDs Programmable Logic Devices
- FPGAs Field Programmable Gate Arrays
- processors controllers, microcontrollers, microprocessors, and the like.
- an embodiment of the present invention may be implemented in the form of a module, procedure, function, etc. 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.
- the method of receiving the HARQ ACK / NACK feedback signal from the base station is applicable to a mobile communication system such as LTE, LTE-A, IEEE 802.16m, and the like.
Abstract
Description
Claims (12)
- 이동통신 시스템에서 중계기가 HARQ(Hybrid Automatic Repeat reQuest) ACK/NACK(ACKnowledgement/Negative ACKnowledgement) 피드백 신호를 검출하는 방법에 있어서,기지국으로부터 상기 HARQ ACK/NACK 피드백 신호가 전송되는 특정 채널의 시작점과 상기 특정 채널의 시작점으로부터 상기 특정 채널 내에서 상기 중계기 전용으로 할당된 특정 채널의 위치를 나타내는 옵셋 정보를 포함하는 특정 채널 구성 정보를 수신하는 단계;상기 기지국으로부터 상기 중계기의 상향링크 전송에 대한 HARQ ACK/NACK 피드백 신호를 수신하는 단계; 및상기 수신한 특정 채널 구성 정보에 기초하여 상기 중계기 전용 특정 채널을 검출하여 상기 수신한 HARQ ACK/NACK 피드백 신호를 디코딩하는 단계를 포함하는 것을 특징으로 하는 중계기의 HARQ ACK/NACK 피드백 신호 검출 방법.
- 제 1항에 있어서,상기 기지국으로부터 상기 HARQ ACK 및/또는 상기 HARQ NACK 신호에 대해 사전에 설정된 코드 인덱스 정보를 수신하는 단계; 및상기 코드 인덱스 정보 및 상기 수신한 HARQ ACK/NACK 피드백 신호에 적용된 코드 인덱스에 기초하여 상기 수신한 HARQ ACK/NACK 피드백 신호가 ACK인지 NACK 인지 여부를 판별하는 단계를 더 포함하는 것을 특징으로 하는 중계기의 HARQ ACK/NACK 피드백 신호 검출 방법.
- 제 1항에 있어서,상기 기지국으로부터 상기 특정 채널 구성 정보를 상위 계층 시그널링, 방송채널 및 중계기를 위한 물리 하향링크 제어 채널 중 어느 하나를 통해 수신하는 것을 특징으로 하는 중계기의 HARQ ACK/NACK 피드백 신호 검출 방법.
- 제 1항에 있어서,상기 특정 채널의 시작점은 자원블록(RB: Resource Block) 인덱스로 지시되는 것을 특징으로 하는 중계기의 HARQ ACK/NACK 피드백 신호 검출 방법.
- 제 1항에 있어서,상기 중계기의 상향링크 전송이 복수 개의 다중 레이어를 통한 복수 개의 코드 블록(code block) 전송인 경우, 상기 수신한 HARQ ACK/NACK 피드백 신호는 상기 복수 개의 각 레이어 별로 대응하는 신호인 것을 특징으로 하는 중계기의 HARQ ACK/NACK 피드백 신호 검출 방법.
- 제 1항에 있어서,상기 특정 채널은 상기 중계기를 위한 물리 하향링크 제어 채널에 포함되어 전송되는 것을 특징으로 하는 중계기의 HARQ ACK/NACK 피드백 신호 검출 방법.
- 이동통신 시스템에서 HARQ(Hybrid Automatic Repeat reQuest) ACK/NACK(ACKnowledgement/Negative ACKnowledgement) 피드백 신호를 검출하기 위한 중계기 장치에 있어서,기지국으로부터 상기 HARQ ACK/NACK 피드백 신호가 전송되는 특정 채널의 시작점과 상기 특정 채널의 시작점으로부터 상기 특정 채널 내에서 상기 중계기 장치 전용으로 할당된 특정 채널의 위치를 나타내는 옵셋 정보를 포함하는 특정 채널 구성 정보를 수신하고, 상기 기지국으로부터 상기 중계기의 상향링크 전송에 대한 HARQ ACK/NACK 피드백 신호를 수신하는 RF(Radio Frequency) 유닛; 및상기 수신한 특정 채널 구성 정보에 기초하여 상기 중계기 장치 전용 특정 채널을 검출하여 상기 수신한 HARQ ACK/NACK 피드백 신호를 디코딩하는 프로세서를 포함하는 것을 특징으로 하는 중계기 장치.
- 제 7항에 있어서,상기 RF 유닛은 상기 기지국으로부터 상기 HARQ ACK 및/또는 상기 HARQ NACK 신호에 대해 사전에 설정된 코드 인덱스 정보를 수신하며,상기 프로세서는 상기 코드 인덱스 정보 및 상기 수신한 HARQ ACK/NACK 피드백 신호에 적용된 코드 인덱스에 기초하여 상기 수신한 HARQ ACK/NACK 피드백 신호가 ACK인지 NACK 인지 여부를 판별하는 것을 특징으로 하는 중계기 장치.
- 제 7항에 있어서,상기 RF 유닛은 상기 기지국으로부터 상기 특정 채널 구성 정보를 상위 계층 시그널링, 방송채널 및 중계기를 위한 물리 하향링크 제어 채널 중 어느 하나를 통해 수신하는 것을 특징으로 하는 중계기 장치.
- 제 7항에 있어서,상기 특정 채널의 시작점은 자원블록(RB: Resource Block) 인덱스로 지시되는 것을 특징으로 하는 중계기 장치.
- 제 7항에 있어서,상기 중계기 장치의 상향링크 전송이 복수 개의 다중 레이어를 통한 복수 개의 코드 블록(code block) 전송인 경우, 상기 수신한 HARQ ACK/NACK 피드백 신호는 상기 복수 개의 각 레이어 별로 대응하는 신호인 것을 특징으로 하는 중계기 장치.
- 제 7항에 있어서,상기 특정 채널은 상기 중계기를 위한 물리 하향링크 제어 채널에 포함되어 전송되는 것을 특징으로 하는 중계기 장치.
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Also Published As
Publication number | Publication date |
---|---|
US8995329B2 (en) | 2015-03-31 |
CN102396176A (zh) | 2012-03-28 |
KR20100115320A (ko) | 2010-10-27 |
WO2010120159A3 (ko) | 2011-02-03 |
CN102396176B (zh) | 2015-07-15 |
US20120026935A1 (en) | 2012-02-02 |
KR101749108B1 (ko) | 2017-06-21 |
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