WO2013002528A2 - 무선 통신 시스템에서 하향링크 제어 채널 할당 방법 및 장치 - Google Patents
무선 통신 시스템에서 하향링크 제어 채널 할당 방법 및 장치 Download PDFInfo
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- WO2013002528A2 WO2013002528A2 PCT/KR2012/005017 KR2012005017W WO2013002528A2 WO 2013002528 A2 WO2013002528 A2 WO 2013002528A2 KR 2012005017 W KR2012005017 W KR 2012005017W WO 2013002528 A2 WO2013002528 A2 WO 2013002528A2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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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
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
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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
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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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
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0058—Allocation criteria
- H04L5/0073—Allocation arrangements that take into account other cell interferences
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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
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
Definitions
- the present invention relates to wireless communication, and more particularly, to a method and apparatus for allocating downlink control channels in a wireless communication system including distributed multiple nodes.
- the next generation multimedia wireless communication system which is being actively researched recently, requires a system capable of processing and transmitting various information such as video, wireless data, etc., out of an initial voice-oriented service.
- the fourth generation of wireless communication which is currently being developed after the third generation of wireless communication systems, aims to support high-speed data services of downlink 1 gigabits per second (Gbps) and uplink 500 megabits per second (Mbps).
- Gbps gigabits per second
- Mbps megabits per second
- the purpose of a wireless communication system is to enable a large number of users to communicate reliably regardless of location and mobility.
- a wireless channel is a path loss, noise, fading due to multipath, inter-symbol interference (ISI) or mobility of UE.
- ISI inter-symbol interference
- There are non-ideal characteristics such as the Doppler effect.
- Various techniques have been developed to overcome the non-ideal characteristics of the wireless channel and to improve the reliability of the wireless communication.
- each node in a wireless communication system in which each node cooperates with each other, each node is independent of a base station (BS), an advanced BS (ABS), a Node-B (NB), an eNode-B (eNB), and an access point (AP). It has much better performance than wireless communication systems operating on the back.
- BS base station
- ABS advanced BS
- NB Node-B
- eNB eNode-B
- AP access point
- a distributed multi node system having a plurality of nodes in a cell may be applied.
- the multi-node system may include a distributed antenna system (DAS), a radio remote head (RRH), and the like.
- DAS distributed antenna system
- RRH radio remote head
- standardization work is underway to apply various MIMO (multiple-input multiple-output) and cooperative communication techniques to distributed multi-node systems.
- MIMO multiple-input multiple-output
- introduction of a new control channel is required to apply various MIMO techniques and cooperative communication techniques to the multi-node system.
- An object of the present invention is to provide a method and apparatus for allocating a downlink control channel in a wireless communication system.
- the present invention proposes a new downlink control channel allocation method for supporting a plurality of nodes in a multi-node system having a plurality of nodes in one or a plurality of cells.
- the present invention defines an enhanced physical control format indicator channel (e-PCFICH) indicating location information of a new downlink control channel for supporting a plurality of nodes.
- e-PCFICH enhanced physical control format indicator channel
- the present invention proposes a method for minimizing the complexity of blind decoding in order for the UE to efficiently detect the e-PDCCH.
- a method for allocating a downlink control channel by a base station in a wireless communication system allocates at least one control channel element (CCE) including a plurality of resource elements (REs) to a data region in one resource block (RB). And allocating an enhanced physical downlink control channel (e-PDCCH) corresponding to the at least one CCE, and transmitting a downlink control signal through the allocated e-PDCCH.
- CCE control channel element
- e-PDCCH enhanced physical downlink control channel
- a plurality of CCEs may be allocated to a plurality of RBs according to an aggregation level of the e-PDCCH, and a plurality of e-PDCCHs may correspond to the plurality of CCEs, respectively.
- the plurality of CCEs may be allocated to all resource elements of a data area within the plurality of RBs.
- Each RB may be divided into a plurality of resources, and at least one resource may be allocated to each e-PDCCH according to the aggregation level of the e-PDCCH.
- Each RB may be divided into two to four resources.
- the one CCE may include up to 36 resource elements.
- the one CCE may be allocated to remaining resource elements except for resource elements to which the DMRS is mapped in an orthogonal frequency division multiplexing (OFDM) symbol to which a demodulation reference signal (DMRS) is mapped.
- OFDM orthogonal frequency division multiplexing
- the one CCE may be further allocated to some of the remaining resource elements except for the resource element to which a cell-specific reference signal (CRS) is mapped in the OFDM symbol adjacent to the OFDM symbol to which the DMRS is mapped.
- CRS cell-specific reference signal
- the one CCE may be allocated to resource elements in an OFDM symbol to which DMRS and CRS are not mapped.
- the one CCE may be sequentially assigned to resource elements to which the DMRS and the CRS are not mapped in the time domain or the frequency domain.
- the downlink control channel allocation method may further include allocating e-PDCCHs of a plurality of terminals to the at least one CCE allocated to a data region in the one RB, and multiplexing the e-PDCCHs of the plurality of terminals. Can be.
- a method for detecting a downlink control channel by a terminal in a wireless communication system configures a search region of the e-PDCCH according to an aggregation level of an enhanced physical downlink control channel (e-PDCCH) in a data region of a plurality of resource blocks (RBs). And detecting the e-PDCCH by performing blind decoding in the search region of the configured e-PDCCH, wherein the e-PDCCH includes a plurality of resource elements (REs) of a data region in the RB. Corresponding to at least one control channel element (CCE).
- CCE control channel element
- Each RB may be divided into a plurality of resources, and at least one resource may be allocated to each e-PDCCH according to the aggregation level of the e-PDCCH.
- Each RB may be divided into two to four resources.
- the one CCE may include up to 36 resource elements.
- E-PDCCH enhanced physical downlink control channel
- 1 is a wireless communication system.
- FIG. 2 shows a structure of a radio frame in 3GPP LTE.
- FIG 3 shows an example of a resource grid for one downlink slot.
- 5 shows a structure of an uplink subframe.
- FIG. 6 shows an example of a multi-node system.
- FIG. 10 shows an example of an RB to which DMRSs are mapped.
- FIG. 11 shows an example of an RB to which a CSI RS is mapped.
- FIG. 13 shows an example of resource allocation through an e-PDCCH.
- FIG. 14 shows an example of an R-PDCCH allocated to an RB.
- 15 shows an example of an e-PDCCH allocated to an RB.
- 16 shows another example of an e-PDCCH allocated to an RB.
- FIG 17 shows another example of an e-PDCCH allocated to an RB.
- FIG. 19 shows an example of mapping an e-PDCCH to an RB according to the proposed e-PDCCH allocation method.
- FIG. 20 shows another example in which an e-PDCCH is mapped to an RB according to the proposed e-PDCCH allocation method.
- FIG. 21 shows another example in which an e-PDCCH is mapped to an RB according to the proposed e-PDCCH allocation method.
- FIG. 22 shows another example in which an e-PDCCH is mapped to an RB according to the proposed e-PDCCH allocation method.
- FIG. 23 shows an example of configuration of a discovery region of an e-PDCCH according to an aggregation level when a plurality of CCEs are allocated to an e-PDCCH according to the proposed e-PDCCH allocation method.
- 25 shows another example of resource partitioning for CCE allocation in one RB according to the proposed e-PDCCH allocation method.
- 26 shows another example of resource partitioning for CCE allocation in one RB according to the proposed e-PDCCH allocation method.
- 29 shows an embodiment of a proposed e-PDCCH detection method.
- FIG. 30 is a block diagram of a wireless communication system in which an embodiment of the present invention is implemented.
- CDMA code division multiple access
- FDMA frequency division multiple access
- TDMA time division multiple access
- OFDMA orthogonal frequency division multiple access
- SC-FDMA single carrier frequency division multiple access
- CDMA may be implemented by 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).
- GSM global system for mobile communications
- GPRS general packet radio service
- EDGE enhanced data rates for GSM evolution
- OFDMA may be implemented by wireless technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, evolved UTRA (E-UTRA), and the like.
- IEEE 802.16m is an evolution of IEEE 802.16e and provides backward compatibility with systems based on IEEE 802.16e.
- UTRA is part of a universal mobile telecommunications system (UMTS).
- 3rd generation partnership project (3GPP) long term evolution (LTE) is part of evolved UMTS (E-UMTS) using evolved-UMTS terrestrial radio access (E-UTRA), which employs OFDMA in downlink and SC in uplink -FDMA is adopted.
- LTE-A (advanced) is the evolution of 3GPP LTE.
- 1 is a wireless communication system.
- the wireless communication system 10 includes at least one base station (BS) 11.
- Each base station 11 provides a communication service for a particular geographic area (generally called a cell) 15a, 15b, 15c.
- the cell can in turn be divided into a number of regions (called sectors).
- the UE 12 may be fixed or mobile and may have a mobile station (MS), a mobile terminal (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, or a PDA. (personal digital assistant), wireless modem (wireless modem), a handheld device (handheld device) may be called other terms.
- the base station 11 generally refers to a fixed station communicating with the terminal 12, and may be called in other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, and the like. have.
- eNB evolved-NodeB
- BTS base transceiver system
- access point and the like. have.
- a terminal typically belongs to one cell, and a cell to which the terminal belongs is called a serving cell.
- a base station that provides a communication service for a serving cell is called a serving BS. Since the wireless communication system is a cellular system, there are other cells adjacent to the serving cell. Another cell adjacent to the serving cell is called a neighbor cell.
- a base station that provides communication service for a neighbor cell is called a neighbor BS. The serving cell and the neighbor cell are relatively determined based on the terminal.
- downlink means communication from the base station 11 to the terminal 12
- uplink means communication from the terminal 12 to the base station 11.
- the transmitter may be part of the base station 11 and the receiver may be part of the terminal 12.
- the transmitter may be part of the terminal 12 and the receiver may be part of the base station 11.
- the wireless communication system may be any one of a multiple-input multiple-output (MIMO) system, a multiple-input single-output (MIS) system, a single-input single-output (SISO) system, and a single-input multiple-output (SIMO) system.
- MIMO multiple-input multiple-output
- MIS multiple-input single-output
- SISO single-input single-output
- SIMO single-input multiple-output
- the MIMO system uses a plurality of transmit antennas and a plurality of receive antennas.
- the MISO system uses multiple transmit antennas and one receive antenna.
- the SISO system uses one transmit antenna and one receive antenna.
- the SIMO system uses one transmit antenna and multiple receive antennas.
- the transmit antenna means a physical or logical antenna used to transmit one signal or stream
- the receive antenna means a physical or logical antenna used to receive one signal or stream.
- FIG. 2 shows a structure of a radio frame in 3GPP LTE.
- a radio frame consists of 10 subframes, and one subframe consists of two slots. Slots in a radio frame are numbered with slots # 0 through # 19. The time taken for one subframe to be transmitted is called a transmission time interval (TTI). TTI may be referred to as a scheduling unit for data transmission. For example, one radio frame may have a length of 10 ms, 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 a plurality of subcarriers in the frequency domain.
- the OFDM symbol is used to represent one symbol period since 3GPP LTE uses OFDMA in downlink, and may be called a different name according to a multiple access scheme.
- SC-FDMA when SC-FDMA is used as an uplink multiple access scheme, it may be referred to as an SC-FDMA symbol.
- a resource block (RB) includes a plurality of consecutive subcarriers in one slot in resource allocation units.
- the structure of the radio frame is merely an example. Accordingly, the number of subframes included in the radio frame, the number of slots included in the subframe, or the number of OFDM symbols included in the slot may be variously changed.
- 3GPP LTE defines that one slot includes 7 OFDM symbols in a normal cyclic prefix (CP), and one slot includes 6 OFDM symbols in an extended CP. .
- CP normal cyclic prefix
- Wireless communication systems can be largely divided into frequency division duplex (FDD) and time division duplex (TDD).
- FDD frequency division duplex
- TDD time division duplex
- uplink transmission and downlink transmission are performed while occupying different frequency bands.
- uplink transmission and downlink transmission are performed at different times while occupying the same frequency band.
- the channel response of the TDD scheme is substantially reciprocal. This means that the downlink channel response and the uplink channel response are almost the same in a given frequency domain. Therefore, in a TDD based wireless communication system, the downlink channel response can be obtained from the uplink channel response.
- the uplink transmission and the downlink transmission are time-divided in the entire frequency band, and thus the downlink transmission by the base station and the uplink transmission by the terminal cannot be simultaneously performed.
- uplink transmission and downlink transmission are performed in different subframes.
- FIG 3 shows an example of a resource grid for one downlink slot.
- the downlink slot includes a plurality of OFDM symbols in the time domain and N RB resource blocks in the frequency domain.
- the number N RB of resource blocks included in the downlink slot depends on the downlink transmission bandwidth set in the cell. For example, in the LTE system, N RB may be any one of 60 to 110.
- One resource block includes a plurality of subcarriers in the frequency domain.
- the structure of the uplink slot may also be the same as that of the downlink slot.
- Each element on the resource grid is called a resource element.
- an exemplary resource block includes 7 ⁇ 12 resource elements including 7 OFDM symbols in the time domain and 12 subcarriers in the frequency domain, but the number of OFDM symbols and the number of subcarriers in the resource block is equal to this. It is not limited. The number of OFDM symbols and the number of subcarriers can be variously changed according to the length of the CP, frequency spacing, and the like. For example, the number of OFDM symbols is 7 for a normal CP and the number of OFDM symbols is 6 for an extended CP. The number of subcarriers in one OFDM symbol may be selected and used among 128, 256, 512, 1024, 1536 and 2048.
- the downlink subframe includes two slots in the time domain, and each slot includes seven OFDM symbols in the normal CP.
- the leading up to 3 OFDM symbols (up to 4 OFDM symbols for 1.4Mhz bandwidth) of the first slot in the subframe are the control regions to which control channels are allocated and the remaining OFDM symbols are the physical downlink shared channel (PDSCH). Becomes the data area to be allocated.
- PDSCH physical downlink shared channel
- the PDCCH includes 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, and random access transmitted on PDSCH. Resource allocation of higher layer control messages such as responses, sets of transmit power control commands for individual UEs in any UE group, activation of voice over internet protocol (VoIP), and the like.
- 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 an aggregation of one or several consecutive control channel elements (CCEs).
- CCEs control channel elements
- 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.
- the base station determines the PDCCH format according to the DCI to be sent to the terminal, and attaches a cyclic redundancy check (CRC) to the control information.
- CRC cyclic redundancy check
- RNTI a unique radio network temporary identifier
- the PDCCH is for a specific terminal, a unique identifier of the terminal, for example, a cell-RNTI (C-RNTI) may be masked to the CRC.
- C-RNTI cell-RNTI
- a paging indication identifier for example, p-RNTI (P-RNTI) may be masked to the CRC.
- SI-RNTI system information-RNTI
- RA-RNTI random access-RNTI
- 5 shows a structure of an uplink subframe.
- the uplink subframe may be divided into a control region and a data region in the frequency domain.
- the control region is allocated a physical uplink control channel (PUCCH) for transmitting uplink control information.
- the data region is allocated a physical uplink shared channel (PUSCH) for transmitting data.
- the terminal may support simultaneous transmission of the PUSCH and the PUCCH.
- PUCCH for one UE is allocated to an RB pair in a subframe.
- Resource blocks belonging to a resource block pair occupy different subcarriers in each of the first slot and the second slot.
- the frequency occupied by the resource block belonging to the resource block pair allocated to the PUCCH is changed based on a slot boundary. This is called that the RB pair allocated to the PUCCH is frequency-hopped at the slot boundary.
- the terminal may obtain a frequency diversity gain by transmitting uplink control information through different subcarriers over time.
- m is a location index indicating a logical frequency domain location of a resource block pair allocated to a PUCCH in a subframe.
- the uplink control information transmitted on the PUCCH includes a hybrid automatic repeat request (HARQ) acknowledgment (ACK) / non-acknowledgement (NACK), a channel quality indicator (CQI) indicating a downlink channel state, and an uplink radio resource allocation request. (scheduling request).
- HARQ hybrid automatic repeat request
- ACK acknowledgment
- NACK non-acknowledgement
- CQI channel quality indicator
- the PUSCH is mapped to the UL-SCH, which is a transport channel.
- the uplink data transmitted on the PUSCH may be a transport block which is a data block for the UL-SCH transmitted during the TTI.
- the transport block may be user information.
- the uplink data may be multiplexed data.
- the multiplexed data may be a multiplexed transport block and control information for the UL-SCH.
- control information multiplexed with data may include a CQI, a precoding matrix indicator (PMI), a HARQ, a rank indicator (RI), and the like.
- the uplink data may consist of control information only.
- the technology is evolving toward increasing the density of nodes that can be connected to a user.
- performance may be further improved by cooperation between nodes.
- FIG. 6 shows an example of a multi-node system.
- the multi-node system 20 may include one base station 21 and a plurality of nodes 25-1, 25-2, 25-3, 25-4, and 25-5. .
- the plurality of nodes 25-1, 25-2, 25-3, 25-4, and 25-5 may be managed by one base station 21. That is, the plurality of nodes 25-1, 25-2, 25-3, 25-4, and 25-5 operate as part of one cell.
- each node 25-1, 25-2, 25-3, 25-4, 25-5 may be assigned a separate node identifier or operate like some antenna group in a cell without a separate node ID. can do.
- the multi-node system 20 of FIG. 6 may be viewed as a distributed multi node system (DMNS) forming one cell.
- DMNS distributed multi node system
- the plurality of nodes 25-1, 25-2, 25-3, 25-4, and 25-5 may perform scheduling and handover (HO) of the terminal with individual cell IDs.
- the multi-node system 20 of FIG. 6 may be viewed as a multi-cell system.
- the base station 21 may be a macro cell, and each node may be a femto cell or a pico cell having cell coverage smaller than the cell coverage of the macro cell.
- a multi-tier network when a plurality of cells are overlayed and configured according to coverage, it may be referred to as a multi-tier network.
- each node 25-1, 25-2, 25-3, 25-4, and 25-5 is a base station, Node-B, eNode-B, pico cell eNb (PeNB), home eNB (HeNB), It may be any one of a radio remote head (RRH), a relay station (RS) and a distributed antenna. At least one antenna may be installed in one node. Nodes may also be called points.
- a node refers to an antenna group spaced apart from a predetermined interval in DMNS. That is, in the following specification, it is assumed that each node physically means RRH. However, the present invention is not limited thereto, and a node may be defined as any antenna group regardless of physical intervals.
- a base station composed of a plurality of cross polarized antennas is reported to be composed of a node composed of horizontal polarized antennas and a node composed of vertical polarized antennas.
- the present invention can be applied.
- the present invention can be applied to a case where each node is a pico cell or femto cell having a smaller cell coverage than a macro cell, that is, a multi-cell system.
- the antenna may be replaced with not only a physical antenna but also an antenna port, a virtual antenna, an antenna group, and the like.
- the reference signal will be described below.
- Reference signal is generally transmitted in sequence.
- the reference signal sequence may use a PSK-based computer generated sequence.
- PSK include binary phase shift keying (BPSK) and quadrature phase shift keying (QPSK).
- the reference signal sequence may use a constant amplitude zero auto-correlation (CAZAC) sequence.
- CAZAC sequences are ZC-based sequences, ZC sequences with cyclic extensions, ZC sequences with truncation, etc. There is this.
- the reference signal sequence may use a pseudo-random (PN) sequence.
- PN sequences include m-sequences, computer generated sequences, Gold sequences, and Kasami sequences.
- the reference signal sequence may use a cyclically shifted sequence.
- the downlink reference signal includes a cell-specific RS (CRS), a multimedia broadcast and multicast single frequency network (MBSFN) reference signal, a UE-specific RS, and a positioning RS (PRS) ) And channel state information (CSI) reference signals (CSI RS).
- CRS is a reference signal transmitted to all UEs in a cell.
- the CRS may be used for channel measurement for channel quality indicator (CQI) feedback and channel estimation for PDSCH.
- the MBSFN reference signal may be transmitted in a subframe allocated for MBSFN transmission.
- the UE-specific reference signal is a reference signal received by a specific terminal or a specific group of terminals in a cell, and may be referred to as a demodulation RS (DMRS).
- DMRS demodulation RS
- a specific terminal or a specific terminal group is mainly used for data demodulation.
- the PRS may be used for position estimation of the terminal.
- the CSI RS is used for channel estimation for the PDSCH of the LTE-A terminal.
- the CSI RS may be relatively sparse in the frequency domain or the time domain and may be punctured in the data region of the general subframe or the MBSFN subframe. If necessary through the estimation of the CSI, CQI, PMI and RI may be reported from the terminal.
- the CRS is transmitted in every downlink subframe in a cell supporting PDSCH transmission.
- CSI RS is described in 6.10 of 3rd Generation Partnership Project (3GPP) TS 36.211 V10.1.0 (2011-03) "Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical channels and modulation (Release 8)". See section .1.
- FIG. 7 illustrates a case in which a base station uses one antenna port
- FIG. 8 illustrates a case in which a base station uses two antenna ports
- FIG. 9 illustrates a pattern in which a CRS is mapped to an RB when the base station uses four antenna ports.
- the CRS pattern may be used to support the features of LTE-A. For example, it can be used to support features such as coordinated multi-point (CoMP) transmission and reception techniques or spatial multiplexing.
- the CRS may be used for channel quality measurement, CP detection, time / frequency synchronization, and the like.
- 'R0' is a reference signal for the first antenna port
- 'R1' is a reference signal for the second antenna port
- 'R2' is a reference signal for the third antenna port
- 'R3' is a reference for the fourth antenna port Indicates a signal. Positions in subframes of R0 to R3 do not overlap with each other.
- l is the position of the OFDM symbol in the slot l in the normal CP has a value between 0 and 6. In one OFDM symbol, a reference signal for each antenna port is located at 6 subcarrier intervals.
- the number of R0 and the number of R1 in the subframe is the same, the number of R2 and the number of R3 is the same.
- the number of R2 and R3 in the subframe is less than the number of R0 and R1.
- Resource elements used for reference signals of one antenna port are not used for reference signals of other antennas. This is to avoid interference between antenna ports.
- the CRS is always transmitted by the number of antenna ports regardless of the number of streams.
- the CRS has an independent reference signal for each antenna port.
- the location of the frequency domain and the location of the time domain in the subframe of the CRS are determined regardless of the UE.
- the CRS sequence multiplied by the CRS is also generated regardless of the terminal. Therefore, all terminals in the cell can receive the CRS.
- the position and the CRS sequence in the subframe of the CRS may be determined according to the cell ID.
- the location in the time domain in the subframe of the CRS may be determined according to the number of the antenna port and the number of OFDM symbols in the resource block.
- the location of the frequency domain in the subframe of the CRS may be determined according to the number of the antenna, the cell ID, the OFDM symbol index l, the slot number in the radio frame, and the like.
- the CRS sequence may be applied in units of OFDM symbols in one subframe.
- the CRS sequence may vary according to a cell ID, a slot number in one radio frame, an OFDM symbol index in a slot, a type of CP, and the like.
- the number of reference signal subcarriers for each antenna port on one OFDM symbol is two.
- the number of reference signal subcarriers for each antenna on one OFDM symbol is 2 ⁇ N RB . Therefore, the length of the CRS sequence is 2 ⁇ N RB .
- Equation 1 shows an example of the CRS sequence r (m).
- 2N RB max is the number of resource blocks corresponding to the maximum bandwidth.
- 2N RB max is 110 in 3GPP LTE.
- c (i) is a pseudo random sequence in a PN sequence and may be defined by a Gold sequence of length-31. Equation 2 shows an example of the gold sequence c (n).
- x 1 (i) is the first m-sequence and x 2 (i) is the second m-sequence.
- the first m-sequence or the second m-sequence may be initialized for each OFDM symbol according to a cell ID, a slot number in one radio frame, an OFDM symbol index in a slot, a type of CP, and the like.
- only a portion of the 2 ⁇ N RB length may be selected and used in a reference signal sequence generated with a 2 ⁇ 2N RB max length.
- Frequency hopping may be applied to the CRS.
- the frequency hopping pattern may be one radio frame (10 ms), and each frequency hopping pattern corresponds to one cell identity group.
- At least one downlink subframe may be configured as an MBSFN subframe by a higher layer in a radio frame on a carrier supporting PDSCH transmission.
- Each MBSFN subframe may be divided into a non-MBSFN area and an MBSFN area.
- the non-MBSFN region may occupy the first one or two OFDM symbols in the MBSFN subframe. Transmission in the non-MBSFN region may be performed based on the same CP as used in the first subframe (subframe # 0) in the radio frame.
- the MBSFN region may be defined as OFDM symbols not used as the non-MBSFN region.
- the MBSFN reference signal is transmitted only when a physical multicast channel (PMCH) is transmitted, and is transmitted on antenna port 4.
- the MBSFN reference signal may be defined only in the extended CP.
- PMCH physical multicast channel
- v represents the number of layers used for PDSCH transmission.
- DMRS is transmitted to one terminal on any one antenna port in the set S.
- DMRS exists and is valid for demodulation of PDSCH only when transmission of PDSCH is associated with the corresponding antenna port.
- DMRS is transmitted only in the RB to which the corresponding PDSCH is mapped.
- DMRS is not transmitted in a resource element in which either a physical channel or a physical signal is transmitted regardless of the antenna port.
- DMRS is described in 6.10. Of 3rd Generation Partnership Project (3GPP) TS 36.211 V10.1.0 (2011-03) "Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical channels and modulation (Release 8)". See section 3.
- 3GPP 3rd Generation Partnership Project
- TS 36.211 V10.1.0 2011-03
- E-UTRA Evolved Universal Terrestrial Radio Access
- Physical channels and modulation (Release 8). See section 3.
- FIG. 10 shows an example of an RB to which DMRSs are mapped.
- Rp represents a resource element used for DMRS transmission on antenna port p.
- R 5 indicates a resource element on which DMRSs for antenna port 5 are transmitted.
- DMRSs for antenna ports 7 and 8 may include first, sixth, and eleventh subcarriers (subcarrier indexes 0, 6) of the sixth and seventh OFDM symbols (OFDM symbol indexes 5 and 6) of each slot. Transmitted through the resource element corresponding to 5, 10).
- DMRSs for antenna ports 7 and 8 may be distinguished by orthogonal sequences of length 2.
- DMRSs for antenna ports 9 and 10 are resources corresponding to the second, seventh, and twelfth subcarriers (subcarrier indexes 1, 6, and 11) of the sixth and seventh OFDM symbols (OFDM symbol indexes 5 and 6) of each slot. Transmitted through the element.
- CSI RS is transmitted through one, two, four or eight antenna ports.
- CSI RS is described in 6.10 of 3rd Generation Partnership Project (3GPP) TS 36.211 V10.1.0 (2011-03) "Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA); Physical channels and modulation (Release 8)". See section .5.
- CSI RS In the transmission of CSI RS, up to 32 different configurations can be proposed to reduce inter-cell interference (ICI) in a multi-cell environment, including a heterogeneous network (HetNet) environment.
- the CSI RS configuration is different depending on the number of antenna ports and the CP in the cell, and adjacent cells may have different configurations as much as possible.
- the CSI RS configuration may be divided into a case of applying to both the FDD frame and the TDD frame and the case of applying only to the TDD frame according to the frame structure.
- Multiple CSI RS configurations may be used in one cell. Zero or one CSI configuration may be used for a terminal assuming non-zero transmission power, and zero or several CSI configurations may be used for a terminal assuming zero transmission power.
- a UE transmits a special subframe of a TDD frame, a subframe or a paging message in which a CSI RS transmission collides with a synchronization signal, a physical broadcast channel (PBCH), and a system information block type 1 (SystemInformationBlockType1).
- the CSI RS is not transmitted in the subframe.
- the resource element to which the RS is transmitted is not used for transmission of CSI RS of PDSCH or other antenna port.
- FIG. 11 shows an example of an RB to which a CSI RS is mapped.
- CSI RSs for antenna ports 15 and 16 indicate resource elements corresponding to third subcarriers (subcarrier index 2) of the sixth and seventh OFDM symbols (OFDM symbol indexes 5 and 6) of the first slot. Is sent through.
- the CSI RSs for the antenna ports 17 and 18 are transmitted through resource elements corresponding to the ninth subcarriers (subcarrier index 8) of the sixth and seventh OFDM symbols (OFDM symbol indexes 5 and 6) of the first slot.
- the CSI RS for antenna ports 19 and 20 is transmitted through the same resource element that the CSI RS for antenna ports 15 and 16 is transmitted, and the CSI RS for antenna ports 21 and 22 is transmitted to the CSI RS for antenna ports 17 and 18. It is transmitted through the same resource element.
- the RB may be distributedly allocated or continuously allocated.
- RBs indexed sequentially in the frequency domain are called physical RBs (PRBs), and RBs obtained by remapping PRBs are called virtual RBs (VRBs).
- PRBs physical RBs
- VRBs virtual RBs
- Two allocation types may be supported in allocating the virtual PRB.
- Localized type VRBs can be obtained by direct mapping one-to-one indexed PRBs in order within the frequency domain.
- Distributed type VRB can be obtained by distributing and interleaving PRBs according to a specific rule.
- DCI formats 1A, 1B, 1C, and 1D transmitted on the PDCCH to allocate the PDSCH include a Localized / Distributed VRB assignment flag. Whether a VRB is a local type or a distributed type may be indicated through a localized / distributed VRB assignment flag.
- PCFICH physical control format indicator channel
- 3GPP LTE allocates a PDCCH to transmit a downlink control signal for controlling a terminal.
- the region where the PDCCHs of the plurality of terminals are mapped may be referred to as a PDCCH region or a control region.
- the PCFICH carries information on the number of OFDM symbols used for the PDCCH in a subframe.
- Information on the number of OFDM symbols to which the PDCCH is allocated may be referred to as a control format indicator (CFI). All terminals in the cell must search the area to which the PDCCH is allocated, and thus CIF can be set to a cell-specific value.
- a control region for which a PDCCH is to be allocated is allocated to the foremost OFDM symbols of a downlink subframe, and the PDCCH may be allocated to up to three OFDM symbols.
- CIF is set to 3, so that the PDCCH is allocated in three OFDM symbols earlier in a subframe.
- the UE detects its own PDCCH in the control region and can find its PDSCH through the PDCCH detected in the control region.
- PDCCH has been transmitted using transmission diversity within a certain region, and includes beamforming, multi-user (MU) -multi-input multiple-output (MIMO), and best band selection (best band).
- MU multi-user
- MIMO multi-input multiple-output
- best band selection best band.
- a new control channel may be introduced in addition to the existing PDCCH.
- a control channel newly defined in the following description is referred to as an enhanced PDCCH (e-PDCCH).
- the e-PDCCH may be allocated to the data region instead of the existing control region to which the PDCCH is allocated.
- the e-PDCCH is defined, it is possible to transmit a control signal for each node for each UE, and solve a problem that the existing PDCCH region may be insufficient.
- a new channel indicating the region to which the e-PDCCH is allocated can be defined. That is, an enhanced PCFICH (e-PCFICH) indicating an area to which an e-PDCCH is allocated may be newly defined.
- the e-PCFICH may carry some or all information necessary for detecting the e-PDCCH.
- the e-PDCCH may be allocated to a common search space (CSS) in an existing control region or to a data region.
- SCS common search space
- FIG. 13 shows an example of resource allocation through an e-PDCCH.
- the e-PDCCH may be allocated to a part of the data area rather than the existing control area.
- the e-PDCCH is not provided to the legacy legacy terminal and may be searched by a terminal (hereinafter, referred to as a rel-11 terminal) supporting 3GPP LTE rel-11.
- the rel-11 terminal performs blind decoding for detecting its e-PDCCH.
- the minimum area information for detecting the e-PDCCH may be transmitted through a newly defined e-PCFICH or an existing PDCCH.
- PDSCH may be scheduled by an e-PDCCH allocated to a data region.
- the base station may transmit downlink data to each terminal through the scheduled PDSCH.
- a wireless communication system including a relay station has recently been developed.
- the relay station serves to extend cell coverage and improve transmission performance.
- the base station serves the terminal located at the coverage boundary of the base station through the relay station, it is possible to obtain the effect of extending the cell coverage.
- the relay station can increase the transmission capacity by improving the transmission reliability of the signal between the base station and the terminal. Even if the terminal is within the coverage of the base station, the relay station may be used when it is located in the shadow area.
- the uplink and downlink between the base station and the repeater is a backhaul link, and the uplink and downlink between the base station and the terminal or the repeater and the terminal are an access link.
- a signal transmitted through the backhaul link is called a backhaul signal
- a signal transmitted through the access link is called an access signal.
- a relay zone In a wireless communication system including a relay station, a relay zone may be defined.
- the relay region means a period in which a control channel (hereinafter R-PDCCH) for a relay station or a data channel (hereinafter R-PDSCH) for a relay station is transmitted in a downlink subframe transmitted by the base station. That is, the backhaul transmission is performed in the downlink subframe.
- R-PDCCH control channel
- R-PDSCH data channel
- FIG. 14 shows an example of an R-PDCCH allocated to an RB.
- a DL grant may be allocated to a first slot in an RB, and a UL grant or PDSCH may be allocated to a second slot.
- the R-PDCCH may be allocated to the remaining resource elements except for the resource elements to which the control region, the CRS, and the DMRS are mapped. Both CRS and DMRS may be used for demodulation of the R-PDCCH.
- antenna port 7 and a scrambling ID (SCID) 0 may be used.
- antenna port 0 is used only when there is one PBCH transmit antenna, and when two or four PBCH transmit antennas are used, the antenna is switched to Tx diversity mode. Ports 0-1 or 0-3 can all be used.
- the structure of the existing R-PDCCH described in FIG. 14 may be reused. That is, only the DL grant may be allocated to the first slot in the RB, and the UL grant or the PDSCH may be allocated to the second slot.
- the e-PDCCH may be allocated to the remaining resource elements except for the resource elements to which the control region, the CRS, and the DMRS are mapped.
- 15 shows an example of an e-PDCCH allocated to an RB.
- an e-PDCCH is configured in both a first slot and a second slot in an RB.
- Only DL grant may be allocated to the e-PDCCH allocated to the first slot, and a UL grant may be allocated to the e-PDCCH allocated to the second slot.
- the DL grant represents a DCI format (DCI format 1, 1A, 1B, 1C, 1D, 2, 2A, etc.) for transmitting downlink control information for the terminal, and the UL grant is a DCI for transmitting uplink control information for the terminal.
- Format DCI formats 0 and 4).
- the UE Since the DL grant and the UL grant to be detected for each slot are divided in the RB, the UE configures a search region in the first slot to perform blind decoding for detecting the DL grant, and also provides a search region in the second slot. Configure blind decoding to detect the UL grant.
- DL transmission modes 1 to 9 and UL transmission modes 1 to 2 exist.
- One transmission mode may be allocated to each terminal through higher layer signaling for the DL and the UL.
- 16 shows another example of an e-PDCCH allocated to an RB.
- an e-PDCCH is configured only in a first slot in an RB. That is, the DL grant and the UL grant may be simultaneously allocated to the e-PDCCH allocated to the first slot. Therefore, the DL grant and the UL grant exist simultaneously in the e-PDCCH of the first slot.
- the UE configures a search region in the first slot to perform blind decoding for detecting the DL grant and the UL grant.
- one transmission mode may be allocated to each terminal through higher layer signaling for the DL and the UL.
- the DL transmission mode there are two DCI formats that each UE should detect for each transmission mode, and all DL transmission modes basically include DCI format 1A to support the fall-back mode.
- the terminal detects only DCI format 0, and when the UL transmission mode is 2, the terminal detects DCI formats 0 and 4.
- FIG 17 shows another example of an e-PDCCH allocated to an RB.
- an e-PDCCH of each terminal is multiplexed in a time domain or a frequency domain. That is, the e-PDCCH of each terminal is cross-interleaved in the time domain or the frequency domain in the state where the common PRB set is set.
- 17- (a) shows a case where an e-PDCCH is allocated to a first slot and a second slot of an RB
- FIG. 17- (b) shows a case where an e-PDCCH is allocated only to a first slot of an RB.
- the e-PDCCH of each UE is divided into several parts and allocated. Accordingly, diversity gain can be obtained in the time domain or the frequency domain.
- a region to which an e-PDCCH is allocated is divided into an interleaving region in which the e-PDCCH of each terminal is cross interleaved in a time domain or a frequency domain, and a non-interleaving region in which the e-PDCCH of each terminal is not cross interleaved.
- the e-PDCCH of each terminal may be cross interleaved in a time domain or a frequency domain to obtain diversity gain.
- the cross interleaving unit of the e-PDCCH may be a CCE unit or a slot unit.
- a DMRS port suitable for each region must be allocated, and a DMRS sequence corresponding to the region needs to be set.
- the DMRS sequence is based on a physical cell ID (PCI), and flexible PCI may be additionally configured using CSI RS configuration, dedicated signaling, etc. in addition to PCI for multiplexing of the e-PDCCH. Can be.
- the e-PDCCH may be divided and allocated to a resource region for a common search region and a resource region for a terminal specific search region.
- the e-PDCCH may be divided and allocated to a resource region for a first RNTI set and a resource region for a second RNTI set among a plurality of RNTIs.
- the present invention proposes a method for efficiently allocating an e-PDCCH to a plurality of terminals.
- CCE is a basic unit that configures information bits transmitted through the PDCCH. Since the default generation bit of the PDCCH is 72 bits, which is modulated into 36 QPSK symbols by QPSK modulation, the CCE occupies 36 resource elements. According to the link quality between the UE and the base station, the information bits transmitted through the corresponding PDCCH are set to 1, 2, 4, or 8 times 72 bits, and each case is referred to as aggregation levels 1, 2, 4, and 8 of the PDCCH.
- an e-CCE which is a basic unit constituting an information bit of the e-PDCCH, may be newly introduced instead of the CCE used previously.
- the e-CCE may occupy a different number of resource elements than the CCE.
- the e-CCE may support aggregation levels 1, 2, 4, and 8.
- the CCE includes both the CCE for the existing PDCCH and the e-CCE for the e-PDCCH.
- whether or not the e-PDCCH of the plurality of terminals is multiplexed on one RB may be considered.
- One or less CCEs are allocated to one VRB, PRB or PRB pair. If one CCE, i.e., 36 resource elements are secured for allocating an e-PDCCH to one RB, 1, 2, 4, and 8 RBs are used to construct a discovery region for aggregation levels 1, 2, 4, and 8 You can configure the search area.
- the e-PDCCH may be allocated except for resource elements used for transmission of CRS, DMRS, and CSI RS in the RB and resource elements in a control region to which a PDCCH may be allocated.
- the e-PDCCH is preferably allocated to a resource element capable of accurate channel estimation and easy demodulation. That is, the most suitable location to which the e-PDCCH is allocated are resource elements in the vicinity of the DMRS. However, depending on the configuration, channel estimation for the e-PDCCH may be performed using the CRS.
- FIG. 19 shows an example of mapping an e-PDCCH to an RB according to the proposed e-PDCCH allocation method.
- the e-PDCCH may be allocated to a resource element in an OFDM symbol used for transmission of the DMRS in the RB. This can be applied regardless of whether the VRB allocation type is a local type or a distributed type.
- 19- (a) shows a case of demodulating an e-PDCCH using at least one antenna port of DMRS ports 7, 8, 11, and 13.
- the e-PDCCH may be allocated to the remaining resource elements except for the resource element for which DMRS may be transmitted in the 6th and 7th OFDM symbols (OFDM symbol indexes 5 and 6) of each slot.
- 19- (b) shows a case of demodulating an e-PDCCH using at least one antenna port of DMRS ports 9, 10, 12, and 14.
- the e-PDCCH may be allocated to the remaining resource elements except for the resource element for which DMRS may be transmitted in the 6th and 7th OFDM symbols (OFDM symbol indexes 5 and 6) of each slot.
- the e-PDCCH occupies 36 resource elements, i.e., one CCE.
- FIG. 20 shows another example in which an e-PDCCH is mapped to an RB according to the proposed e-PDCCH allocation method.
- the e-PDCCH may be allocated to a resource element in the OFDM symbol used for transmission of the DMRS in the RB and a resource element in the vicinity thereof.
- e-PDCCH is the remaining 24 resource elements except for all resource elements that can be used for DMRS transmission in the 6th and 7th OFDM symbols (OFDM symbol indexes 5 and 6) of each slot, which are OFDM symbols used for DMRS transmission. Can occupy.
- the e-PDCCH is the third, fourth, fifth, eighth, ninth and tenth subcarriers (subcarrier indexes 2, 3, and 6) of the 6th and 7th OFDM symbols (OFDM symbol indexes 5 and 6) of each slot. 4, 7, 8, and 9 may be allocated to the resource element corresponding to. In addition, it may be allocated to neighboring OFDM symbols of the OFDM symbol used for transmission of the DMRS. That is, the e-PDCCH may be allocated to some resource element sets among the resource element sets 1 to 12 in FIG. 20. If the e-PDCCH is allocated to 6 resource element sets of the 12 resource element sets, the e-PDCCH may occupy a total of 36 resource elements, that is, 1 CCE.
- an e-PDCCH may be allocated to resource element sets 1, 2, 3, 5, 6, and 7 in FIG. 20.
- three sets of resource elements may be selected in the first slot and the remaining three sets of resource elements may be selected in the second slot.
- the e-PDCCH may be allocated only to resource elements in an OFDM symbol used for transmission of DMRS in the RB. That is, the e-PDCCH may occupy only 24 resource elements in one RB. That is, since one CCE cannot be transmitted in one RB, one CCE is transmitted in two RBs.
- the UE may detect and decode e-PDCCHs of aggregation levels 1, 2, 4, and 8 in 2, 3, 6, and 12 RBs.
- FIG. 21 shows another example in which an e-PDCCH is mapped to an RB according to the proposed e-PDCCH allocation method.
- the e-PDCCH may be allocated to an OFDM symbol that is not used for transmission of the CRS and the DMRS. Three or more OFDM symbols are required to configure an e-PDCCH that occupies one CCE in one RB.
- the control region to which the PDCCH can be allocated may be set to one or two OFDM symbols instead of three OFDM symbols. 21 shows a case where the control region occupies two OFDM symbols in the RB.
- the OFDM symbols to which the e-PDCCH can be allocated are the third and fourth OFDM symbols (OFDM symbol indexes 2 and 3) of each slot.
- the e-PDCCH may be allocated to three OFDM symbols of a total of four OFDM symbols. 21 shows a case where an e-PDCCH is allocated to 3rd, 4th and 9th OFDM symbols in an RB.
- FIG. 22 shows another example in which an e-PDCCH is mapped to an RB according to the proposed e-PDCCH allocation method.
- the e-PDCCH may be allocated in a manner of sequentially filling resource elements available in the time domain or the frequency domain. That is, when the e-PDCCH occupies one CCE in one RB, the e-PDCCH is allocated to resource elements not allocated to the CRS, the DMRS, and the control region on the basis of the time domain or the frequency domain. In FIG. 22, it is assumed that the control region is allocated to two OFDM symbols earlier in the RB. In FIG. 22- (a), the e-PDCCH is sequentially allocated to empty resource elements based on the time domain.
- the e-PDCCH is first allocated to empty 3rd and 4th OFDM symbols, and is allocated to resource elements not assigned to the CRS in the 5th OFDM symbol and resource elements not allocated to the DMRS in the 6th OFDM symbol.
- the e-PDCCH is sequentially allocated to empty resource elements based on the frequency domain. That is, the e-PDCCH is sequentially assigned to resource elements not allocated to the CRS, the DMRS, and the control region in the first to fourth subcarriers. For aggregation levels 2, 4 and 8, it can be equally extended to 2RB, 4RB and 8RB.
- a method of allocating a plurality of CCEs for the e-PDCCH will be described.
- a plurality of CCEs are allocated to one VRB, PRB or PRB pair.
- the search region becomes N RBs.
- N may be greater than or equal to 1, and thus a plurality of CCEs may be allocated to at least one RB.
- FIG. 23 shows an example of configuration of a discovery region of an e-PDCCH according to an aggregation level when a plurality of CCEs are allocated to an e-PDCCH according to the proposed e-PDCCH allocation method.
- the e-PDCCH may be allocated except for resource elements used for transmission of CRS, DMRS, and CSI RS in the RB and resource elements in a control region to which a PDCCH may be allocated. If the control region occupies only two OFDM symbols in the resource block, the total number of resource elements that can be allocated to the e-PDCCH in one RB is 104 in total. Assuming that one CCE occupies 36 resource elements as before, only one RB is required at aggregation level 1 and 2, two RBs are required at aggregation level 4, and three RBs are required at aggregation level 8. In FIG. 23, CRS and DMRS are omitted for convenience.
- the e-PDCCH may be detected by searching only fewer RBs. For example, if the aggregation level of the e-PDCCH of each UE is limited to 4 or less, the UE may detect only the 2RB to detect the e-PDCCH. After allocating the e-PDCCH in the RB, the remaining resource elements may be empty or filled with filter bits.
- a search area corresponding to each aggregation level may be configured in N RBs.
- FIG. 24 shows a case of configuring a search region of e-PDCCHs of aggregation levels 1, 2, and 4 in one RB.
- One RB is divided into four resources, and an e-PDCCH of aggregation level L may be allocated to L resources.
- a first resource (resource # 0) is an antenna port 7
- a second resource (resource # 1) is an antenna port 8
- a third resource (resource # 2) is an antenna port 9, a fourth resource (resource # 3).
- the terminal may use a DMRS previously designated or known by higher layer signaling for demodulation of the e-PDCCH allocated to each resource.
- the number of blind decodings performed at one RB is four times at aggregation level 1 (for resources 0, 1, 2 and 3), twice at aggregation level 2 (for resources 0/1 and 2/3), and This can be done seven times, once at level 4 (for resources 0-3). If there are N RBs to which an e-PDCCH may be allocated, the UE may perform blind decoding on a per RB basis.
- the resource division of FIG. 24 may also be applied when configuring a search region of e-PDCCHs of aggregation levels 1, 2, 4, and 8 in two RBs.
- One RB is divided into four resources, and an e-PDCCH of aggregation level L may be allocated to L resources.
- the terminal may use a DMRS previously designated or known by higher layer signaling for demodulation of the e-PDCCH allocated to each resource.
- the number of blind decodings performed in the two RBs may be performed eight times at the aggregation level 1, four times at the aggregation level 2, two times at the aggregation level 4, and one time at one aggregation level 8.
- the UE may perform blind decoding on a per RB basis. For example, if a search region is configured in four RBs, the UE may perform 15 blind decodings in the first and second RBs and 15 blind decodings in the third and fourth RBs. If blind decoding is performed in units of two RBs and one RB remains, blind decoding is performed four times at aggregation level 1, two times at aggregation level 2, and one times at aggregation level 4 in the other RB.
- 25 shows another example of resource partitioning for CCE allocation in one RB according to the proposed e-PDCCH allocation method.
- FIG. 25 shows a case of configuring a search region of e-PDCCHs of aggregation levels 1, 2, and 4 in two RBs.
- One RB is divided into two resources, and an e-PDCCH of an aggregation level L may be allocated to L resources.
- the first resource (resource # 0) corresponds to antenna port 7
- the second resource (resource # 1) corresponds to antenna port 8, but the present invention is not limited thereto.
- the terminal may use a DMRS previously designated or known by higher layer signaling for demodulation of the e-PDCCH allocated to each resource.
- the number of blind decodings performed in the two RBs may be performed four times at the aggregation level 1, twice at the aggregation level 2, and seven times at once at the aggregation level 4. If there are N RBs to which an e-PDCCH may be allocated, the UE may perform blind decoding in units of two RBs. If blind decoding is performed in units of two RBs and one RB remains, blind decoding is performed twice at the aggregation level 1 and once at the aggregation level 2 in the other RB.
- the resource division of FIG. 25 may also be applied when configuring a search region of e-PDCCHs of aggregation levels 1, 2, 4, and 8 in four RBs.
- One RB is divided into two resources, and an e-PDCCH of an aggregation level L may be allocated to L resources.
- the terminal may use a DMRS previously designated or known by higher layer signaling for demodulation of the e-PDCCH allocated to each resource.
- the number of blind decodings performed in the four RBs may be performed a total of 15 times, eight times at the aggregation level 1, four times at the aggregation level 2, two times at the aggregation level 4, and one time at the aggregation level 8. If there are N RBs to which an e-PDCCH can be allocated, the UE may perform blind decoding in units of four RBs.
- 26 shows another example of resource partitioning for CCE allocation in one RB according to the proposed e-PDCCH allocation method.
- FIG. 26 shows a case of configuring search regions of e-PDCCHs of aggregation levels 1, 2, and 4 in four RBs.
- One RB is divided into three resources, and an e-PDCCH of an aggregation level L may be allocated to L resources.
- the first resource (resource # 0) corresponds to antenna port 7
- the second resource (resource # 1) corresponds to antenna port 8
- the third resource (resource # 2) corresponds to antenna port 9.
- the invention is not limited thereto.
- the terminal may use a DMRS previously designated or known by higher layer signaling for demodulation of the e-PDCCH allocated to each resource.
- the number of blind decodings performed in four RBs may be performed twelve times at aggregation level 1, six times at aggregation level 2, and three times at three times at aggregation level 4. If there are N RBs to which an e-PDCCH can be allocated, the UE may perform blind decoding in units of four RBs.
- a search region of e-PDCCHs of aggregation levels 1 and 2 may be configured in two RBs.
- one RB is not divided into a plurality of resources and one RB is composed of a discovery region of an e-PDCCH of aggregation level 1.
- Two RBs consist of a search region of an e-PDCCH of aggregation level 2. If there are N RBs to which an e-PDCCH can be allocated, the UE may perform blind decoding in units of four RBs.
- the search areas of the e-PDCCHs of the aggregation levels k1, k2, ..., kn may be k1, k2, ..., kn RBs (k1 ⁇ k2 ⁇ ... ⁇ kn), respectively.
- the e-PDCCHs of the plurality of terminals may be classified or multiplexed for each terminal. It is assumed that the e-PDCCH of each terminal is allocated for each terminal as in the method described with reference to FIGS. 19 to 26.
- the e-PDCCH of each UE may be configured with 1, 2, 4, and 8 CCEs for aggregation levels 1, 2, 4, and 8.
- the e-PDCCH of each terminal is allocated to different RBs, and concatenated RBs according to the CCE size allocated to each terminal to concatenate (R) of the plurality of terminals.
- PDCCH may be transmitted.
- the e-PDCCH of the first terminal is allocated to two RBs and the e-PDCCH of the second terminal is allocated to four RBs, six RBs may be connected to transmit the e-PDCCHs of the two terminals.
- the starting point of the e-PDCCH of each terminal may be informed through an e-PCFICH.
- the e-PDCCH of the plurality of terminals may be multiplexed.
- the e-PDCCH of each UE may be multiplexed on a layer, rank, or spatial axis.
- e-PDCCHs of four UEs are multiplexed on a space axis in one RB.
- CRS, DMRS, etc. are omitted for convenience.
- the number of UEs that can be multiplexed onto one RB may be changed by each node or scheduler in consideration of link conditions of the UEs.
- the UE may perform blind decoding in units of antenna ports to detect the e-PDCCH.
- the DMRS ports allocated for each terminal need to be configured not to overlap or to maintain orthogonality.
- the DMRS port to be used for decoding its own e-PDCCH for each terminal may be informed to the terminal through higher layer signaling or may be previously designated.
- DMRS information (antenna port and / or a parameter for generating a DMRS sequence) for channel estimation of the e-PDCCH may be informed to the terminal through higher layer signaling or may be previously designated.
- the terminal when the base station informs the terminal of the antenna ports 7 and 8, the terminal performs blind decoding on the antenna ports 7 and 8 to detect the e-PDCCH. If the same operation can be performed through the CRS, the CRS can also be used for channel estimation for each terminal.
- the e-PDCCHs of a plurality of UEs may be allocated in one RB through multiplexing of the e-PDCCH, resource efficiency may be improved.
- a search order may be specified. For example, when blind decoding the e-PDCCH using the antenna ports ⁇ k1, k2, k3, k4 ⁇ , the UE may blind decode the e-PDCCH in the order of the antenna ports ⁇ k1, k2, k3, k4 ⁇ . Can be. In this case, the UE detecting the e-PDCCH using a specific antenna port may assume that the e-PDCCH is transmitted through the antenna ports in the order prior to the corresponding antenna port, and that the corresponding PDSCH may also be transmitted together with other PDSCHs. have.
- a UE that detects an e-PDCCH at antenna port k3 may assume that another e-PDCCH is transmitted at antenna ports k1 and k2, and may assume that its own PDSCH is also transmitted along with two other PDSCHs. .
- previous blind decoding information may be used to simplify the blind decoding operation.
- the UE that detects its e-PDCCH at antenna port 8 may perform blind decoding in the order of antenna ports 8, 9, 10, and 7. Through this method, the number of blind decoding of the UE can be effectively reduced.
- step S100 the base station allocates at least one CCE to the data area in the RB.
- step S110 the base station allocates the e-PDCCH to at least one CCE. In allocating the e-PDCCH, the example described with reference to FIGS. 19 to 27 may be applied.
- step S120 the base station transmits a downlink control signal through the assigned e-PDCCH.
- 29 shows an embodiment of a proposed e-PDCCH detection method.
- step S200 the UE configures a search region of the e-PDCCH.
- the search region of the e-PDCCH may be at least one RB according to the aggregation level.
- step S210 the UE performs blind decoding for detection of the e-PDCCH in the search region of the configured e-PDCCH.
- FIG. 30 is a block diagram of a wireless communication system in which an embodiment of the present invention is implemented.
- the base station 800 includes a processor 810, a memory 820, and a radio frequency unit (RF) 830.
- Processor 810 implements the proposed functions, processes, and / or methods. Layers of the air interface protocol may be implemented by the processor 810.
- the memory 820 is connected to the processor 810 and stores various information for driving the processor 810.
- the RF unit 830 is connected to the processor 810 to transmit and / or receive a radio signal.
- the terminal 900 includes a processor 910, a memory 920, and an RF unit 930.
- Processor 910 implements the proposed functions, processes, and / or methods. Layers of the air interface protocol may be implemented by the processor 910.
- the memory 920 is connected to the processor 910 and stores various information for driving the processor 910.
- the RF unit 930 is connected to the processor 910 to transmit and / or receive a radio signal.
- Processors 810 and 910 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices.
- the memory 820, 920 may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium, and / or other storage device.
- the RF unit 830 and 930 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.
- the module may be stored in the memory 820, 920 and executed by the processor 810, 910.
- the memories 820 and 920 may be inside or outside the processors 810 and 910, and may be connected to the processors 810 and 910 by various well-known means.
Abstract
Description
Claims (15)
- 무선 통신 시스템에서 기지국에 의한 하향링크 제어 채널 할당 방법에 있어서,
하나의 자원 블록(RB; resource block) 내의 데이터 영역에 복수의 자원 요소(RE; resource element)들을 포함하는 적어도 하나의 제어 채널 요소(CCE; control channel elements)를 할당하고,
상기 적어도 하나의 CCE에 대응되는 e-PDCCH(enhanced physical downlink control channel)를 할당하고,
상기 할당된 e-PDCCH를 통해 하향링크 제어 신호를 전송하는 것을 포함하는 하향링크 제어 채널 할당 방법. - 제 1 항에 있어서,
상기 e-PDCCH의 집합 레벨(aggregation level)에 따라 복수의 RB들에 복수의 CCE들이 할당되며,
상기 복수의 CCE들에 복수의 e-PDCCH들이 각각 대응되는 것을 특징으로 하는 하향링크 제어 채널 할당 방법. - 제 2 항에 있어서,
상기 복수의 CCE들은 상기 복수의 RB 내의 데이터 영역의 모든 자원 요소들에 할당되는 것을 특징으로 하는 하향링크 제어 채널 할당 방법. - 제 2 항에 있어서,
상기 각 RB는 복수의 자원으로 분할되고,
상기 e-PDCCH의 집합 레벨에 따라 각 e-PDCCH에 적어도 하나의 상기 자원이 할당되는 것을 특징으로 하는 하향링크 제어 채널 할당 방법. - 제 4 항에 있어서,
상기 각 RB는 2개 내지 4개의 자원으로 분할되는 것을 특징으로 하는 하향링크 제어 채널 할당 방법. - 제 1 항에 있어서,
상기 하나의 CCE는 최대 36개의 자원 요소들을 포함하는 것을 특징으로 하는 하향링크 제어 채널 할당 방법. - 제 1 항에 있어서,
상기 하나의 CCE는 복조 참조 신호(DMRS; demodulation reference signal)가 맵핑되는 OFDM(orthogonal frequency division multiplexing) 심벌 내에서 상기 DMRS가 맵핑되는 자원 요소들을 제외한 나머지 자원 요소들에 할당되는 것을 특징으로 하는 하향링크 제어 채널 할당 방법. - 제 7 항에 있어서,
상기 하나의 CCE는 상기 DMRS가 맵핑되는 OFDM 심벌과 인접한 OFDM 심벌 내에서 셀 특정 참조 신호(CRS; cell-specific reference signal)가 맵핑되는 자원 요소를 제외한 나머지 자원 요소들 중 일부에 더 할당되는 것을 특징으로 하는 하향링크 제어 채널 할당 방법. - 제 1 항에 있어서,
상기 하나의 CCE는 DMRS 및 CRS가 맵핑되지 않는 OFDM 심벌 내의 자원 요소들에 할당되는 것을 특징으로 하는 하향링크 제어 채널 할당 방법. - 제 1 항에 있어서,
상기 하나의 CCE는 시간 영역(time domain) 또는 주파수 영역(frequency domain)에서 DMRS 및 CRS가 맵핑되지 않는 자원 요소들에 차례대로 할당되는 것을 특징으로 하는 하향링크 제어 채널 할당 방법. - 제 1 항에 있어서,
상기 하나의 RB 내의 데이터 영역에 할당된 상기 적어도 하나의 CCE에 복수의 단말들의 e-PDCCH들을 할당하고,
상기 복수의 단말들의 e-PDCCH들을 다중화하는 것을 더 포함하는 하향링크 제어 채널 할당 방법. - 무선 통신 시스템에서 단말에 의한 하향링크 제어 채널 검출 방법에 있어서,
복수의 자원 블록(RB; resource block)의 데이터 영역에 e-PDCCH(enhanced physical downlink control channel)의 집합 레벨(aggregation level)에 따라 상기 e-PDCCH의 탐색 영역을 구성하고,
상기 구성된 e-PDCCH의 탐색 영역에서 블라인드 디코딩을 수행하여 상기 e-PDCCH를 검출하는 것을 포함하되,
상기 e-PDCCH는 상기 RB 내의 데이터 영역의 복수의 자원 요소(RE; resource element)들을 포함하는 적어도 하나의 제어 채널 요소(CCE; control channel elements)에 대응되는 것을 특징으로 하는 하향링크 제어 채널 검출 방법. - 제 12 항에 있어서,
상기 각 RB는 복수의 자원으로 분할되고,
상기 e-PDCCH의 집합 레벨에 따라 각 e-PDCCH에 적어도 하나의 상기 자원이 할당되는 것을 특징으로 하는 하향링크 제어 채널 검출 방법. - 제 13 항에 있어서,
상기 각 RB는 2개 내지 4개의 자원으로 분할되는 것을 특징으로 하는 하향링크 제어 채널 검출 방법. - 제 12항에 있어서,
상기 하나의 CCE는 최대 36개의 자원 요소들을 포함하는 것을 특징으로 하는 하향링크 제어 채널 검출 방법.
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US14/127,137 US20140119317A1 (en) | 2011-06-30 | 2012-06-26 | Method and apparatus for allocating a downlink control channel in a wireless communication system |
EP12804043.3A EP2731283B1 (en) | 2011-06-30 | 2012-06-26 | Method and apparatus for allocating a downlink control channel in a wireless communication system |
KR1020137033025A KR101514175B1 (ko) | 2011-06-30 | 2012-06-26 | 무선 통신 시스템에서 하향링크 제어 채널 할당 방법 및 장치 |
JP2014515773A JP5663700B2 (ja) | 2011-06-30 | 2012-06-26 | 無線通信システムにおけるダウンリンク制御チャネル割当方法及び装置 |
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Also Published As
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KR101514175B1 (ko) | 2015-04-22 |
JP5663700B2 (ja) | 2015-02-04 |
EP2731283A2 (en) | 2014-05-14 |
EP2731283A4 (en) | 2015-03-25 |
CN103636151A (zh) | 2014-03-12 |
KR20140016376A (ko) | 2014-02-07 |
US20140119317A1 (en) | 2014-05-01 |
EP2731283B1 (en) | 2018-10-10 |
WO2013002528A3 (ko) | 2013-02-28 |
JP2014517642A (ja) | 2014-07-17 |
CN103636151B (zh) | 2017-02-15 |
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