WO2012124924A2 - 반송파 집성 기법이 적용된 무선 통신 시스템에서 단말이 신호를 송수신하는 방법 및 이를 위한 장치 - Google Patents
반송파 집성 기법이 적용된 무선 통신 시스템에서 단말이 신호를 송수신하는 방법 및 이를 위한 장치 Download PDFInfo
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- WO2012124924A2 WO2012124924A2 PCT/KR2012/001660 KR2012001660W WO2012124924A2 WO 2012124924 A2 WO2012124924 A2 WO 2012124924A2 KR 2012001660 W KR2012001660 W KR 2012001660W WO 2012124924 A2 WO2012124924 A2 WO 2012124924A2
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- uplink
- subframe
- downlink
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- carrier
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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
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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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT the frequencies being arranged in component carriers
-
- 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 signalling, i.e. of overhead other than pilot signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
- H04L5/0096—Indication of changes in 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
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/1469—Two-way operation using the same type of signal, i.e. duplex using time-sharing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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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 signalling, i.e. of overhead other than pilot signals
- H04L5/0055—Physical resource allocation for ACK/NACK
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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
- H04L5/0064—Rate requirement of the data, e.g. scalable bandwidth, data priority
Definitions
- the present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting and receiving signals by a terminal in a wireless communication system to which a carrier aggregation technique is applied.
- 3GPP LTE 3rd
- LTE Generation Partnership Project Long Term Evolution
- E-UMTS Evolved Universal Mobile Telecommuni- cation Systems
- UMTS Universal Mobile Telecom Universal Systems
- LTE Long Term Evolution
- E—UMTS is located at an end of a user equipment (UE), a base station (eNode B; eNB), and a network (E-UTRAN) and connected to an external network (Access Gateway (AG)). It includes.
- the base station may transmit multiple data streams simultaneously for broadcast service, multicast service and / or unicast service.
- Cell is 1.25, 2.5, 5, 10, 15,
- the base station controls data transmission and reception for a plurality of terminals.
- the base station For downlink (DL) data, the base station transmits downlink scheduling information to inform the corresponding UE of time / frequency domain, encoding, data size, HARQ Hybrid Automatic Repeat and reQuest (related information), and the like.
- the base station transmits uplink scheduling information to uplink UL data for uplink (UL) data and informs the user equipment of time / frequency domain, encoding, data size, HARQ related information, etc. available to the user equipment.
- An interface for transmitting user traffic or control traffic may be used between base stations.
- the core network (CN) may be composed of an AG and a network node for user registration of the terminal.
- the AG manages the mobility of the UE in units of a TACTracking Area consisting of a plurality of cells.
- Wireless communication technology has been developed to LTE based on WCDMA, but the demands and expectations of users and operators are continuously increasing.
- other wireless access technologies continue to be developed, so that the future competitiveness. To have it requires a new technological evolution. Reduced cost per bit, increased service availability, the use of flexible frequency bands, simple structure and open interface, and adequate power consumption of the terminal are required.
- the present invention proposes a method for transmitting and receiving a signal for transmitting and receiving a signal and an apparatus therefor.
- a method for transmitting and receiving a signal with a base station by a terminal includes: receiving a preamble from a base station through a specific component carrier; Determining the use of one of uplink and downlink of the corresponding subframe based on the preamble; And according to the determination result, performing one of an uplink signal transmission through the specific component carrier or a downlink signal reception through the specific component carrier from the base station. In addition, performing a carrier detection process for an unlicensed frequency band; And setting the unlicensed frequency band to the specific component carrier when the unlicensed frequency band is detected in a dormant state.
- the corresponding subframe may include a guard interval between the preamble reception interval and the uplink signal transmission interval or the downlink signal reception interval.
- the corresponding subframe when used for the uplink signal transmission, the corresponding subframe includes the preamble receiving period, the first guard period, the uplink signal transmission period, and the second guard period. It is done.
- the first guard interval is the reception-transmission switching time of the terminal
- the second guard interval is the transmission-reception switching time of the terminal. .
- a method for transmitting and receiving a signal from a base station to a base station in a wireless communication system to which a carrier aggregation technique is applied includes: receiving information on at least one uplink-downlink subframe configuration from the base station; Performing a carrier detection process on an unlicensed frequency band; Setting the unlicensed frequency band as a secondary component carrier when the unlicensed frequency band is detected in a dormant state; And applying the at least one uplink-downlink subframe configuration from a predetermined time point.
- the predetermined time point may be a time point when a preamble corresponding to the uplink-downlink subframe configuration is received.
- a specific region among subframes according to the at least one uplink-downlink subframe configuration may be set as a dedicated region for the carrier detection process, and the specific region is the at least one uplink-downlink subframe.
- the subframes according to the configuration it is characterized in that the second slot of the last subframe or 1/2 area of the last symbol of the last subframe.
- the method may further include receiving a dummy signal for occupying the unlicensed band from the base station.
- a downlink subframe of the subcomponent carrier Receiving an uplink grant; Receiving an activity indicator corresponding to the uplink grant; And performing uplink transmission according to the uplink grant at a time when the active indicator is performed, wherein the time when the active indicator is performed is a subframe or a next subframe in which the active indicator is received. It is characterized by that.
- the subframes according to the at least one uplink-downlink subframe configuration may be configured only with one of an uplink subframe or a downlink subframe.
- an uplink grant received in the downlink subframe Preferably includes information on a subframe in which an uplink signal is transmitted in response to the uplink grant.
- a terminal when a carrier aggregation technique is applied to a wireless communication system, a terminal can effectively transmit and receive a signal using an unlicensed band.
- FIG. 1 schematically illustrates an E-UMTS network structure as an example of a wireless communication system.
- Control Plane Control Plane
- User Plane User Plane structure of a radio interface protocol (Radio Interface Protocol) between a "terminal and E- UTRAN based on the 3GPP radio access network standard.
- Radio Interface Protocol Radio Interface Protocol
- Figure 3 is a diagram for explaining the general ⁇ the signal transmission method using the physical channels and those used in the 3GPP system.
- FIG. 4 is a diagram illustrating a structure of a radio frame used in an LTE system.
- FIG. 5 is a diagram illustrating a structure of a downlink radio frame used in an LTE system.
- 6 illustrates a resource unit used to configure a control channel.
- 7 illustrates an example of distributing CCEs in a system band.
- FIG 8 illustrates the structure of an uplink subframe used in an LTE system.
- FIG. 9 is a conceptual diagram illustrating a carrier aggregation technique.
- FIG. 10 is a diagram illustrating an example in which a cross carrier scheduling technique is applied.
- FIG 11 illustrates an uplink transmission procedure and an uplink subframe structure for the same according to the first embodiment of the present invention.
- FIG. 12 illustrates a downlink transmission procedure and a downlink subframe structure according to the first embodiment of the present invention.
- FIG. 13 illustrates a subframe configuration configured using the subframe structures of FIGS. 11 and 12 according to the first embodiment of the present invention.
- FIG. 16 illustrates an example in which a UE performs measurement in a downlink subframe configured only for a time of T from a start point of application of a message X according to a second embodiment of the present invention.
- FIG. 17 shows another example of applying a subframe setting according to the second embodiment of the present invention.
- FIG. 18 shows an example set for the purpose of performing a specific area carrier detection operation according to the third embodiment of the present invention.
- FIG 19 shows another example in which a specific region is set for the purpose of performing a carrier detection operation according to the third embodiment of the present invention.
- FIG. 20 shows another example in which a specific region is set for the purpose of performing a carrier detection operation according to the third embodiment of the present invention.
- FIG. 21 illustrates an example of applying a shortened downlink subframe according to a fourth embodiment of the present invention.
- FIG. 22 shows an example in which a specific sequence is used for preamble of a subframe for uplink grant transmission and an uplink grant active message according to a fourth embodiment of the present invention.
- FIG. 23 shows an example of using a subcomponent carrier during a TxOP period consisting of N subframes according to the fifth embodiment of the present invention.
- 24 shows an example of performing PUSCH transmission according to the fifth embodiment of the present invention.
- 25 shows an example of setting TxOP according to the sixth embodiment of the present invention.
- FIG. 26 illustrates an example of performing PUSCH transmission according to the sixth embodiment of the present invention.
- FIG. 27 illustrates a block diagram of a communication device according to an embodiment of the present invention.
- FIG. 2 is a diagram illustrating a control plane and a user plane structure of a radio interface protocol between a terminal and an E-UTRAN based on a 3GPP radio access network standard.
- the control plane refers to a path through which control messages used by a user equipment (UE) and a network to manage a call are transmitted.
- the user plane refers to a path through which data generated at an application layer, for example, voice data or Internet packet data, is transmitted.
- the physical layer which is the first layer, provides an information transfer service to an upper layer by using a physical channel.
- the physical tradeoff is connected to the upper Media Access Control layer through a transport channel. Through the transmission channel Data moves between the medium access control layer and the physical layer. Data moves between the physical layer between the transmitting side and the receiving side through the physical channel.
- the physical channel utilizes time and frequency as radio resources. In general, the physical channel is
- FDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- the medium access control (MAC) layer of the second layer provides a service to a radio link control (RLC) layer, which is a higher layer, through a logical channel.
- RLC radio link control
- the function of the RLC layer may be implemented as a functional block inside the MAC.
- the Packet Data Convergence Protocol (PDCP) layer of the second layer provides unnecessary control for efficiently transmitting IP packets such as IPv4 or IPv6 over a narrow bandwidth air interface. Perform header compression to reduce information.
- Radio Resource Control (RRC) tradeoffs located at the bottom of the third layer are defined only in the control plane.
- the RRC layer is responsible for control of logical channels, transport channels, and physical channels in connection with configuration, re_conf igurat ion, and release of radio bearers (RBs).
- RB refers to a service provided by Layer 2 for data transmission between the terminal and the network.
- the RRC layers of the UE and the network exchange RRC messages with each other. If there is an RRC connected (RRC Connected) between the terminal and the RRC layer of the network, the terminal is in the RC Connected Mode, otherwise it is in the RRC Idle Mode.
- the non-access stratum (NAS) layer above the RRC layer performs functions such as session management and mobility management.
- One cell constituting the base station is set to one of the bandwidth, such as 1.25, 2.5, 5, 10, 15, 20Mhz to provide a downlink or uplink transmission service to multiple terminals.
- Different cells may be configured to provide different bandwidths.
- the downlink transmission channel for transmitting data from the network to the terminal receives system information.
- BCH Broadcast Channel
- PCH Paging Channel
- SCH Downlink Shared Channel
- Traffic or control messages of a downlink multicast or broadcast service may be transmitted through a downlink SCH or may be transmitted through a separate downlink MCH (mult icast channel).
- the uplink transmission channel for transmitting data from the terminal to the network includes a random access channel (RAC) for transmitting an initial control message and an uplink shared channel (SCH) for transmitting user traffic or a control message.
- RAC random access channel
- SCH uplink shared channel
- the logical channel mapped to the transport channel which is mapped to the transport channel, is a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a mulit icast control channel (MCCH), and an MTCH ( Mult icast Traffic Channel).
- BCCH broadcast control channel
- PCCH paging control channel
- CCCH common control channel
- MCCH mulit icast control channel
- MTCH Mult icast Traffic Channel
- the UE When the UE is powered on or enters a new cell, the UE performs an initial cell search operation such as synchronizing with the base station (S301). To this end, the UE receives a Primary Synchronization Channel (P-SCH) and a Secondary Synchronization Channel (S-SCH) from the base station, synchronizes with the base station, and obtains information such as a cell ID. have. Thereafter, the terminal may receive a physical broadcast channel from the base station to obtain broadcast information in a cell. On the other hand, the terminal may receive a downlink reference signal (DL RS) in the initial cell search step to confirm the downlink channel state.
- P-SCH Primary Synchronization Channel
- S-SCH Secondary Synchronization Channel
- the terminal may receive a physical broadcast channel from the base station to obtain broadcast information in a cell.
- the terminal may receive a downlink reference signal (DL RS) in the initial cell search step to confirm the downlink channel state.
- DL RS downlink reference signal
- the UE After the initial cell search, the UE acquires more specific system information by receiving a physical downlink control channel (PDCCH) and a physical downlink control channel (PDSCH) according to the information on the PDCCH. It may be (S302).
- a physical downlink control channel (PDCCH)
- a physical downlink control channel (PDSCH)
- S302 the UE acquires more specific system information by receiving a physical downlink control channel (PDCCH) and a physical downlink control channel (PDSCH) according to the information on the PDCCH. It may be (S302).
- PDCCH physical downlink control channel
- PDSCH physical downlink control channel
- the terminal may perform a random access procedure (RACH) for the base station (steps S303 to S306).
- RACH Random Access procedure
- the terminal is physically random access
- a specific sequence may be transmitted to the preamble through a channel (Physical Random Access Channel; PRACH) (S303), and a response message to the preamble may be received through the PDCCH and the PDSCH (S304).
- PRACH Physical Random Access Channel
- S304 Physical Random Access Channel
- a contention resolution procedure may be additionally performed.
- the UE After performing the procedure described above, the UE performs a PDCCH / PDSCH reception (S307) and a physical uplink shared channel (PUSCH) / physical uplink control channel (Physical Uplink) as a general uplink / downlink signal transmission procedure.
- Control Channel (PUCCH) transmission (S308) may be performed.
- the terminal receives downlink control information (DCI) through the PDCCH.
- DCI downlink control information
- the DCI includes control information such as resource allocation information for the terminal, and the format is different according to the purpose of use.
- the control information transmitted by the terminal to the base station through the uplink or received by the terminal from the base station includes a downlink / uplink ACK / NACK signal, a CQI (Channel Quality Indicator), a PMKPrecoding Matrix Index (RKRank Indicator), and the like. do.
- the terminal may transmit the above-described control information such as CQI / PMI / RL through the PUSCH and / or PUCCH.
- the radio frame is composed of 10ms (327200 ⁇ T s) subframes (subframe) of a size having a length of 10 equivalents.
- Each subframe has a length of 1 ms and consists of two slots.
- Each slot has a length of 0.5 ⁇ 3 (15360 ⁇ T s).
- the slot includes a plurality of 0FDM symbols in the time domain and includes a plurality of resource blocks (RBs) in the frequency domain.
- one resource block includes 12 subcarriers X 7 (6) 0 FDM symbols.
- Transmission time interval (TTI) which is a unit time for transmitting data, may be determined in units of one or more subframes.
- the structure of the above-described radio frame is only an example, the number of subframes included in the radio frame or the number of slots included in the subframe, 0FDM included in the slot The number of symbols may vary.
- FIG. 5 is a diagram illustrating a control channel included in a control region of one subframe in a downlink radio frame.
- a subframe consists of 14 OFDM symbols.
- the first 1 to 3 OFDM symbols are used as the control region and the remaining 13 to 11 OFDM symbols are used as the data region.
- R1 to R4 represent reference signals (RS) or pilot signals for antennas 0 to 3.
- the RS is fixed in a constant pattern in a subframe regardless of the control region and the data region.
- the control channel is allocated to a resource to which no RS is allocated in the control region, and the traffic channel is also allocated to a resource to which no RS is allocated in the data region.
- Control channels allocated to the control region include PCFICH (Physical Control Format Indicator CHannel), PHICH (Physical Hybrid-ARQ Indicator CHannel), PDCCH (Physical Downlink Control CHannel).
- the PCFICH is a physical control format indicator channel and informs the UE of the number of OFDM symbols used for the PDCCH in every subframe.
- the PCFICH is located in the first OFDM symbol and is set in preference to the PHICH and PDCCH.
- the PCFICH is composed of four Resource Element Groups (REGs), and each REG is distributed in the control region based on the cell ID Cell IDentity.
- REG is composed of four resource elements (REs).
- RE represents a minimum physical resource defined by one subcarrier and one OFDM symbol.
- the PCFICH value indicates a value of 1 to 3 or 2 to 4 depending on the bandwidth and is modulated by Quadrature Phase Shift Keying (QPSK).
- QPSK Quadrature Phase Shift Keying
- PHICH is a physical HARQ Hybrid-Automatic Repeat and request (EMC) indicator channel and used to carry HARQ ACK / NACK for uplink transmission. That is, the PHICH indicates a channel through which DL ACK / NACK information for UL HARQ is transmitted.
- the PHICH consists of one REG and is scrambled cell-specifically.
- ACK / NACK is indicated by 1 bit and modulated by binary phase shift keying (BPSK).
- BPSK binary phase shift keying
- a plurality of PHICHs mapped to the same resource constitutes a PHICH group.
- PHICH GROUP The number of PHICHs to be multiplexed is determined according to the number of spreading codes.
- the PHICH (group) is repeated three times to obtain diversity gain in the frequency domain and / or the time domain.
- the PDCCH is a physical downlink control channel and is allocated to the first n OFDM symbols of a subframe.
- n is indicated by the PCFICH as an integer of 1 or more.
- the PDCCH consists of one or more CCEs.
- the PDCCH informs each UE or UE group of information related to resource allocation of a paging channel (PCH) and downlink—shared channel (DL-SCH), an uplink scheduling grant, and HARQ information.
- PCH paging channel
- DL-SCH downlink—shared channel
- HARQ information Paging channel
- PCH Paging channel
- DL_SCH Down ink—shared channel
- Data of the PDSCH is transmitted to which UE (one or a plurality of UEs), and information on how the UEs should receive and decode PDSCH data is included in the PDCCH and transmitted.
- a particular PDCCH is CRC masked with an RNTI (Radio Network Temporary Identity) of "A”, a radio resource (eg, frequency location) of "B” and a transmission type information of "C” (eg, It is assumed that information on data transmitted using a transport block size, modulation scheme, coding information, etc. is transmitted through a specific subframe.
- RNTI Radio Network Temporary Identity
- the terminal in the cell monitors the PDCCH using the RNTI information it has, and if there is at least one terminal having an "A" RNTI, the terminals receive the PDCCH, and through the information of the received PDCCH " Receive the PDSCH indicated by B 1 ′ and “C”.
- 6 shows a resource unit used to configure a control channel.
- 6 (a) shows the case where the number of transmit antennas of the base station is 1 or 2
- RS Reference Signal
- the basic resource unit of the control channel is REG.
- REG RS In the excluded state, it consists of four neighboring resource elements (REs). REG is shown in bold in the figures.
- PCFICH and PHICH include 4 REGs and 3 REGs, respectively.
- the PDCCH is composed of CCE (Control Channel Elements) units, and one CCE includes nine REGs.
- the UE is configured to check M (L) ( ⁇ L) CCEs arranged in a continuous or specific rule in order to confirm whether a PDCCH composed of L CCEs is transmitted to the UE.
- the CCE sets that the UE needs to check for PDCCH reception are called a search space.
- the LTE system defines a search area as shown in Table 1.
- the CCE aggregation level L represents the number of CCEs constituting the PDCCH
- 3 ⁇ 4 ° represents the search region of the CCE aggregation level L
- ⁇ is the number of candidate PDCCHs to be monitored in the discovery region of the aggregation level L.
- the search area may be divided into a UE-specific search space in which only access to a specific terminal is allowed and a common search area in which access to all terminals in a cell is allowed.
- the UE monitors a common search region with CCE aggregation levels of 4 and 8, and monitors a UE-specific search region with CCE aggregation levels of 1, 2, 4, and 8.
- the common search area and the terminal specific search area may overlap.
- the position of the first (with the smallest index) CCE in the PDCCH search region given to any UE for each CCE aggregation level value is changed every subframe according to the UE.
- This is called hashing of the PDCCH search region.
- 7 shows an example of distributing CCEs in a system band. Referring to FIG. 7, a plurality of logically continuous CCEs are input to an interleaver. remind The interleaver performs a function of mixing the input CCEs in REG units. Therefore, the frequency / time resource constituting one CCE is physically held in the entire frequency / time domain in the control region of the subframe and distributed. As a result, the control channel is configured in units of CCE, but interleaving is performed in units of REGs, thereby maximizing frequency diversity and interference randomization gain.
- FIG. 8 is a diagram illustrating a structure of an uplink subframe used in an LTE system.
- an uplink subframe may be divided into a region to which a Physical Uplink Control CHannel (PUCCH) carrying control information is allocated and a region to which a Physical Uplink Shared CHannel (PUSCH) carrying user data is allocated.
- the middle part of the subframe is allocated to the PUSCH, and both parts of the data area are allocated to the PUCCH in the frequency domain.
- the control information transmitted on the PUCCH includes AC / NACK used for HARQ, CQKChannel Quality Indicator indicating downlink channel status, RKRank Indicator for MIM0, and SR (Scheduling Request), which is an uplink resource allocation request.
- the PUCCH for one UE uses one resource block to occupy different frequencies in each slot in a subframe. That is, two resource blocks allocated to the PUCCH are frequency hoped at the slot boundary.
- FIG. 9 is a conceptual diagram illustrating carrier aggregation.
- Carrier aggregation is a plurality of frequency blocks or (logical sense) cells in which a terminal consists of uplink resources (or component carriers) and / or downlink resources (or component carriers) in order for a wireless communication system to use a wider frequency band.
- a terminal consists of uplink resources (or component carriers) and / or downlink resources (or component carriers) in order for a wireless communication system to use a wider frequency band.
- component carrier will be unified.
- the overall system bandwidth (System Bandwidth; System BW) is a logic It has a bandwidth of up to 100 Hz z as a band.
- the entire system band includes five component carriers, each component carrier having a bandwidth of up to 20 MHz.
- a component carrier includes one or more contiguous subcarriers that are physically contiguous.
- each component carrier has the same bandwidth, but this is only an example and each component carrier may have a different bandwidth.
- each of the component carrier but is shown as being adjacent to each other in a frequency domain and ', the figure as shown in the logical concept, each of the component carriers may be adjacent to each other physically, it may be off.
- the center frequency may be used differently for each component carrier or may use one common carrier for physically adjacent component carriers. For example, in FIG. 9, if all component carriers are physically adjacent to each other, center carrier A may be used. In addition, assuming that each component carrier is not physically adjacent to each component carrier, a center carrier A, a center carrier B, or the like may be used separately.
- the component carrier may correspond to the system band of the legacy system.
- provision of backward compatibilities and system design may be facilitated in a wireless communication environment in which an evolved terminal and a legacy terminal coexist.
- each component carrier may correspond to a system band of the LTE system.
- the component carrier may have any one of 1.25, 2.5, 5, 10, or 20 Mhz bandwidth.
- the frequency band used for communication with each terminal is defined in component carrier units.
- UE A may use 100 kHz z as a whole system band and perform communication using all five component carriers.
- UE ⁇ 3 ⁇ 4 can use only 20 MHz bandwidth and performs communication using one component carrier.
- Terminal and C 2 can use 40 MHz bandwidth And communicate with each other using two component carriers.
- the two component carriers may or may not be logically / physically adjacent to each other.
- UE C represents the case of using two non-adjacent component carriers, and UE C2 represents the case of using two adjacent and component carriers.
- a method of scheduling a data channel by the control channel may be classified into a conventional linked carrier scheduling method and a cross carrier scheduling method.
- link carrier scheduling like a conventional LTE system using a single component carrier, a control channel transmitted through a specific component carrier schedules only a data channel through the specific component carrier.
- cross scheduling is a data channel in which a control channel transmitted through a primary component carrier (Crimary CC) using a carrier indicator field (CIF) is transmitted through the primary component carrier or transmitted through another component carrier.
- FIG. 10 is a diagram illustrating an example in which a cross carrier scheduling technique is applied.
- the number of cells (or component carriers) allocated to the relay node is three, and as described above, the cross carrier scheduling scheme is performed using the CIF.
- the downlink cell (or component carrier) # is assumed to be the primary downlink component carrier (ie, primary cell; PCell), and the remaining component carriers, #B, and component carrier K are secondary component carriers (ie, secondary cell; SCell).
- the primary downlink component carrier ie, primary cell; PCell
- component carriers, #B, and component carrier K are secondary component carriers (ie, secondary cell; SCell).
- the preset preamble between the base station and the terminal is placed in front of each subframe.
- the terminal may determine whether the corresponding subframe is set in uplink or downlink direction by receiving the preamble.
- the preamble is located in the same resource in all subframes, and includes information of at least 1 bit size to indicate a setting direction (eg, uplink or downlink) of the subframe.
- the base station and the terminal perform downlink communication or uplink communication according to the subframe structure determined by the preamble.
- the unlicensed band may determine whether to activate based on a carrier sensing (CS) operation
- CS carrier sensing
- FIG 11 illustrates an uplink transmission procedure and an uplink subframe structure for the same according to the first embodiment of the present invention.
- a guard time (G P ) for switching a transmission / reception mode is located after the preamble.
- the UE may perform Rx-Tx switching and the base station may perform Tx-Rx switching in the corresponding guard period. . '
- a guard interval for transmitting / receiving mode switching (for example, Tx—Rx switching) is located at the rear of the current subframe.
- the guard interval may be longer when a propagation delay (T P ) is large and may be set over several symbol positions.
- FIG. 12 illustrates a downlink transmission procedure and a downlink subframe structure according to the first embodiment of the present invention.
- Rx-Tx switching is not required as in the uplink, but the same guard period is preferably located behind the preamble as in the uplink subframe. Do. In this case, the UE may not transmit any signal in the corresponding guard period.
- This structure is such that data transmission and reception starts in the downlink subframe and the uplink subframe. This is to allow the terminal to transmit or receive data at a fixed location by maintaining the same location of the resource.
- FIG. 13 illustrates a subframe configuration configured using the subframe structures of FIGS. 11 and 12 according to the first embodiment of the present invention.
- FIG. 14 shows an example of performing uplink data transmission according to the first embodiment of the present invention.
- FIG. 14 illustrates the uplink sub-list of FIG. 11 when there is a T P between the eNB and the UE.
- An example in which the UE performs uplink data transmission, that is, PUSCH transmission using a frame structure is illustrated.
- the process until the UE transmits uplink data includes “1. After preamble decoding, grasping the use of the corresponding subframe 2. Rx-TX switching ⁇ 3. Timing advance (T A ) Applied uplink data transmission ".
- the guard period G P described above may be used for the purpose of T A.
- the eNB may inform the UE of timing retreat (T R ) information.
- T R is a value indicating how far from the preamble reception time to start uplink data transmission, and may be expressed in units of symbols or time units.
- the eNB may inform the UE of the T R through higher layer signaling or may add a specific field to downlink control information through which uplink grant or downlink allocation information is transmitted.
- a method of recycling a field or codepoint state that is not (currently) used for existing downlink control information may be considered.
- the eNB may be configured in the nearest downlink subframe before the uplink subframe in which actual uplink data transmission occurs to the UE. Downlink control information may be transmitted.
- the eNB may perform higher-order trade-off signaling of the presence and location of an uplink subframe (or an uplink subframe and a downlink subframe) to the UE. You can tell in advance. For example, the eNB may inform the UE of higher layer signaling by using information about uplink / downlink subframe configuration that is valid during a predetermined length (T).
- T predetermined length
- the T value may use a value previously set between the eNB and the UE or the eNB may inform the UE together with the message X through additional higher layer signaling, that is, the message Y.
- the message X and the message Y may be updated based on a predetermined period value.
- message X (or message Y) may be delivered from the eNB to the UE through the downlink primary component carrier of the licensed band or from the eNB to the UE through downlink transmission in the unlicensed band.
- a method of matching the starting point of the application of the message X between the eNB and the UE is an example. To C).
- a specific sequence may be designated as a start sequence X among all N sequences that can be used as a preamble and used to indicate an application start point of the message X.
- a UE that receives a starting sequence X from an eNB in SF #b (where b ⁇ a or b> a) receives an eNB from the eNB during SF #b to T periods based on the message X received in SF #a. It performs unlicensed band-based communication, and during the subsequent (T-1) period except for SF # 1), the UE may not expect to receive a preamble indicating the purpose of the subframe from the eNB. Can also be.
- start sequence X designated for the purpose of indicating the application time of the message X may be used not only for the above-described purposes but also for indicating the purpose of the corresponding subframe, that is, whether the uplink subframe or the downlink subframe. .
- T is assumed to be 10 ms, which is a value previously defined between the eNB and the UE.
- the uplink / downlink subframe configuration is signaled as [DDUUUDDDDD] through the message X, and then the message X is applied from the time when the start sequence X is received.
- T 0 When the UE receives only message X which is a combination of message X and message Y from the eNB in SF #a, the point in time of actually applying message X can be defined as T 0 niethoscopic set value.
- T oiiset is expressed in slot unit black or subframe unit or radio frame unit (or number of (receive) preambles), and can be set to one or more specific values.
- T oifset may use a preset value between the eNB and the UE in advance, or the eNB may inform the UE with the message X through additional higher layer signaling (eg, message Z).
- the reference point of T offset may be specified as the closest slot boundary or subframe boundary or radio frame boundary previously (or later), including SF # 3 receiving message X, which is previously known as eNB It may be preset between the UE and the UE.
- the reference point of T oifset may be designated as the first symbol of a previous specific radio frame, for example, a radio frame of SFN # 0, including SF # 3 receiving the message X.
- T oiiset may count to the number of preambles received later, including SF # 3 receiving the message X.
- FIG. 16 illustrates an example in which a UE performs measurement in a DL subframe set by message X only during a time interval of T from its message X application start point, according to the second embodiment of the present invention.
- the uplink / downlink subframe configuration is [UDDUDDUDDD].
- the total number of UEs is assumed to be 3, and UEs perform measurements in downlink subframes set by message X. only during a time interval of T from the start point of application of message X, and other downlink subframes, that is, No measurements are performed on non-effective subframes.
- the eNB black UE determines that the result of performing the carrier detection operation on the unlicensed band is IDLE for a "T_IDLE" time, it is assumed that the unlicensed band can be used for uplink communication or downlink communication.
- FIG. 17 shows another example of applying a subframe configuration according to the second embodiment of the present invention.
- the configuration of Message X is the same as that of FIG. 15, and it is assumed that the carrier detection operation is performed from the start point of the second slot (based on the slot (black or subframe) boundary of the licensed band). .
- the eNB (or UE) may set an application time point of the message X to a point where the result of performing the carrier detection operation is determined to be IDLE for the T_IDLE time.
- the point where the eNB (or UE) performs the carrier detection operation may be previously defined or separately informed by higher layer signaling.
- the eNB when the eNB informs the UE of the valid message X for a certain time interval T through higher layer signaling, the eNB performs a carrier detection operation on a part of a specific subframe among a plurality of subframes constituting the message X. Can be specified.
- some regions of a specific subframe may be the second slot region of the last subframe among a plurality of subframes corresponding to the T interval, and the eNB and the UE may use the region for downlink communication and uplink communication. Do not use.
- the PDSCH / PUCSH transmitted in the corresponding subframe is reduced. Rate matching or puncturing may be performed by reflecting the number of symbols.
- the eNB (or UE) performs the carrier detection operation for the unlicensed band under the assumption that the uplink / downlink configuration of the T section is repeatedly applied from the first subframe of radio frame # 0. It can also be set to perform only in the area specified for the purpose.
- a partial region of a specific subframe designated for the purpose of performing a carrier detection operation may be set as a symbol region having a size of 1/2 of the last thimble of the last subframe corresponding to the T section.
- the SRS may be restricted to transmit using only the first half symbol of the last symbol.
- the SRS transmitted using only the front 1/2 * symbols of the last symbol may be defined as "Reduced Length SRS" or "Shortened SRS".
- the eNB informs the UE of the information about the location of the corresponding area with a message X in higher layer signaling or is signaled through a physical control channel. It may also be indicated through a specific field (existing or new) of link control information.
- some regions of a specific subframe designated for the purpose of performing a carrier detection operation may be designated in various units such as slots, subframes, and symbols, and such information may be previously shared with the eNB and the UE.
- the eNB may inform the UE through higher layer signaling or through a specific field (existing or new) of downlink control information signaled through the physical control channel ⁇ .
- the eNB when the eNB performs the carrier detection operation for the unlicensed band in the last subframe designated for the purpose of performing the carrier detection operation, that is, the second slot region of SF #n, it is called IDLE during the T ⁇ IDLE time. If determined, the eNB may again use the unlicensed band during the SF # (n + l) to the T period (that is, SF # (n + l) to SF # (n + T)).
- the uplink / downlink subframe configuration to be applied during the period from SF # ( ⁇ + 1) ⁇ can use the existing uplink / downlink subframe configuration as it is.
- the eNB may apply a new uplink / downlink subframe configuration that informs the UE through additional higher layer signaling.
- the eNB determines the SF # ( The unlicensed band may not be used during the n period from n + l) to the T period (that is, SF # (n + l) to SF # (n + T)).
- the eNB does not perform both uplink and downlink communication during the ⁇ period that does not use the unlicensed band, and may not perform the carrier detection operation in the remaining sections except for the region designated for the purpose of performing the carrier detection operation. .
- the time that the eNB does not use the unlicensed band may be set to various values as well as T, and the corresponding value may be informed to the UE by a specific field of a physical control channel or higher layer signaling.
- the eNB may inform the UE by higher layer signaling, it may be desirable to transmit the message X together.
- the eNB may configure a maximum number (T—max) of using the uplink / downlink subframe configuration of the T section to each UE or UEs configured to a specific group through higher layer signaling.
- the T_max value for each UE may be decreased by 1 whenever the uplink / downlink subframe configuration of the T section is used, and the eNB may uplink / downlink the T section at a specific time point.
- priority may be given to UEs having a relatively high T_max value (black is UEs in the specific group).
- the T_max value for each UE may be determined to be updated based on a predetermined period value.
- T uses a value previously defined between the eNB and the UE, and is set to 10 ms, that is, one radio frame in this drawing. Also, message X It is assumed that a second slot region of the last subframe among the subframes that are configured is designated for the purpose of performing a carrier detection operation.
- FIG. 19 illustrates another example in which a specific region is set for the purpose of performing a carrier detection operation according to the third embodiment of the present invention.
- FIG. 19 is a carrier detection operation under the assumption that the eNB (or UE) repeatedly performs the carrier detection operation for the unlicensed band from the first subframe of radio frame # 0 to the uplink / downlink subframe configuration of the T section. It is assumed that the operation is performed only in the corresponding region (that is, the second slot region of SF #n, which is the last subframe corresponding to the T section), for the purpose of execution.
- the uplink / downlink subframe configuration of the message X in Figure 19 is the same [DDDUDUDDDD] as in FIG.
- the eNB determines that the result of performing the carrier detection operation on the unlicensed band in the second slot region of SF #, which is the last subframe corresponding to the T interval, is IDLE during T— IDLE time.
- the unlicensed band is used again during the SF # (n + l) to T period, that is, SF # (n + l) to SF # (n + T).
- the T_IDLE value may share a preset value between the eNB and the UE in advance, or the black eNB may inform the UE through higher layer signaling (or physical layer signaling).
- 20 illustrates another example in which a specific region is set for the purpose of performing a carrier detection operation according to a third embodiment of the present invention. 20 is also performed by the eNB (or UE) under the assumption that the carrier detection operation for the unlicensed band is repeatedly applied to the uplink / downlink subframe configuration of the T section from the first subframe of the radio frame # 0. It is assumed that the operation is performed only in the corresponding region designated as the purpose (that is, the second slot region of SF #n which is the last subframe corresponding to the T section). In addition, it is assumed that the uplink / downlink subframe configuration of the message X in Figure 20 is the same [DDDUDUDDDD] as in FIG.
- a result of an eNB performing a carrier detection operation for an unlicensed band in a second slot region of SF #n, which is the last subframe corresponding to a T interval is shown.
- the eNB does not use the unlicensed band during SF # (n + l) to T periods (SF # (n + l) to SF # (n + T)).
- T_IDLE can be set to other values.
- the T ⁇ IDLE value may share a predefined value between the eNB and the UE in advance, or the eNB may inform the UE through higher layer signaling (or physical layer signaling).
- uplink grant transmission time (or downlink allocation information transmission time) and The relationship between the uplink grant reception time and the PUSCH transmission time (or the relationship between the downlink allocation information reception time and the PDSCH transmission time) may not be previously set.
- the eNB may be uplink. After transmitting the grant to the UE in SF #n, the UE previously received by sending an additional uplink grant activation message to activate the uplink grant to the UE in SF #k (where k ⁇ (n + 4)).
- One uplink grant-based uplink data (ie, PUSCH) transmission may be performed, or the eNB transmits downlink allocation information to the UE in SF #n. Thereafter, by transmitting an additional downlink allocation activation message for activating downlink allocation information to the UE in SF #k (where k ⁇ n or k> n), the UE transmits downlink data based on previously received downlink allocation information. (Ie PDSCH) reception may be performed.
- SF #k when the eNB transmits an uplink grant activation message to the UE, available SF #k after 'SF # (n + 4) or' SF # (n + 4) (where k> (n + 4))
- SF #k black or uplink grant activation is the same point in time when the uplink grant activation message is received. It can also be the first SF # (k + l) after the SF #k that received the message.
- the first SF after SF #k receiving the uplink grant active message # due to the UL Grant so active message is a downlink sub-frame is of short length, such as DwPTS, or or 'special (special) may use a sub-frame to be transmitted, eNB and
- active message is a downlink sub-frame is of short length, such as DwPTS, or or 'special (special) may use a sub-frame to be transmitted, eNB and
- T P propagation delay
- Such a method is also a method in which the eNB can implicitly inform the UE that the use of SF # (k + l) is a UL subframe, and corresponding UL subframe (ie, SF # (k + l)). In the preamble indicating the purpose of the subframe may not be transmitted.
- a DL subframe in which the last symbol or one or more symbols of the downlink subframe is not used may be defined as a short DL subframe.
- the shortened downlink subframe is configured to guarantee the ⁇ ⁇ of the uplink subframe when the subframe after the shortened downlink subframe is used for the use of the uplink subframe in a situation where a TP exists between the eNB and the UE. Can be.
- the shortened downlink subframe is a method that the eNB can implicitly inform the UE that the subframe after the shortened downlink subframe is used for the use of the uplink subframe, the use of the subframe in the uplink subframe A preamble indicating the message may not be transmitted.
- the UE may operate by changing a subframe boundary by TA in an uplink subframe after the shortened downlink subframe.
- a shortened downlink subframe is set not to use the last symbol of a general downlink subframe. It is assumed that a subframe after the shortened downlink subframe is used implicitly for the purpose of the uplink subframe. In addition, it is assumed that a preamble indicating the purpose of the subframe is not transmitted in the uplink subframe after the shortened downlink subframe.
- the interworking relationship between the PUSCH transmission based on the uplink grant and the uplink grant activation message may be implemented as follows. First, of a total of N sequences (ie, sequences known to both eNB and UE) that can be used as preambles, a certain number of sequences can be used for preamble and uplink grant activation message of a subframe for uplink grant transmission. Can be. For example, assuming that sequence B is used as a preamble of SF #x in which an uplink grant is transmitted among a specific number of sequences, SF #x in SF #y (y y? (X + 4)).
- the UE performs PUSCH transmission based on the received uplink grant of SF #x in SF #y or SF # (y + l). do.
- index information of a downlink subframe in which an uplink grant is transmitted may be included in a sequence used for a preamble of a subframe for uplink grant transmission and an uplink grant active message. Accordingly, the UE performs PUSCH transmission based on the uplink grant received in the corresponding downlink subframe based on the index information of the downlink subframe.
- the information on the sequences used for the preamble of the subframe for the uplink grant transmission and the uplink grant activation message among the total N sequences may be set by sharing between the eNB and the UE in advance.
- activation of previously transmitted UL grants and thus PUSCH transmissions may be flexible, as a starting point, as a subframe boundary, as a result of "contention for medium access" in the unlicensed band.
- this corresponds to a case in which an uplink grant activation message is transmitted in a structure such as a preamble in an unlicensed band.
- PDSCH transmission may also be flexible as a result of "contention for medium access" in the unlicensed band, such as the subframe boundary, but not as fixed.
- sequence 22 shows an example in which a specific sequence is used for a preamble and an uplink grant active message of a subframe for uplink grant transmission according to the fourth embodiment of the present invention.
- a particular sequence is represented by sequence B.
- the UE received an uplink grant in SF #x from an eNB, but the SF #x in SF # (x + 7) by an uplink grant active message. It can be seen that the PUSCH based on the uplink grant is actually transmitted.
- the uplink grant (or preamble of a subframe for uplink grant transmission) and the uplink grant activation message may include subframe index information or a subframe number counter for indicating a plurality of subframes.
- an eNB includes N subframe index information in an uplink grant (black is a preamble of a subframe for uplink grant transmission) and transmits the N subframe index information to the UE. If the same index as the subframe index (for example, one of the N subframe indexes) transmitted through the uplink grant (or preamble of the subframe for uplink grant transmission) is included, the UE is provided with the corresponding uplink grant activity.
- SF #w which is a time point at which a message is received, PUSCH transmission may be performed based on a previously received uplink grant in SF # (w + l).
- a secondary component carrier for example, an unlicensed band
- transmission is performed through a downlink subframe of the primary component carrier, that is, a PDCCH.
- the uplink grant may not include information about a plurality of subframe indexes (of a subcomponent carrier). That is, by including subframe index information corresponding to the downlink subframe of the primary component carrier in which the previous uplink grant is transmitted in the uplink grant activation message, the UE can determine the subcomponent of the secondary component carrier based on the previously received uplink grant. Multiple PUSCH transmissions may be performed.
- the eNB when the eNB determines that the result of the carrier detection operation for the secondary component carrier (CC # 2) of the unlicensed band is IDLE, the eNB performs CC # during a transmission opportunity (TxOP) interval consisting of N SFs. 2 may be used.
- TxOP transmission opportunity
- the eNB may inform the UE of the N values and the N subframes in advance through higher layer signaling or physical layer signaling (for example, downlink primary component carrier of the licensed band).
- the eNB may transmit a preamble (or sequence) designated for this purpose in advance through the unlicensed band (X # 2) to inform the UE of information about the start time of TxOP.
- TxOP length or information on N SF usages may be included in the preamble, and after the preamble is transmitted, if the eNB transmits actual downlink information, the subframe boundary of the LTE-A system is transmitted.
- a timing gap may exist between the preamble transmission time and the actual downlink information transmission time, and in particular, CC # 2 cannot be used exclusively by the eNB and the UE and carrier detection is performed. Because it must be used through competition based on other systems, other systems may attempt to transmit information during these timing gaps, so the eNB may not be able to transmit information during the timing gap.
- the CRTBCCarrier Reservation Transport Block may be transmitted through CC # 2, which is an unlicensed band.
- CRTB means a kind of dummy information or a copy of a part of a PUSCH transmitted to reserve CC # 2 as its own resource
- CRTB means a timing gap (for example, a preamble transmission time and an actual downlink). Can be transmitted during information transmission time).
- the above-described CRTB can be transmitted only after the completion of the preamble transmission (actual data transmission time-the Rx-Tx switching time of the eNB). have.
- a UE crosses an uplink grant for CC # 2, which is an unlicensed band, from an eNB through a PDCCH in SF #n of a primary component carrier CC # 1 that is a licensed band.
- CC # 2 which is an unlicensed band
- a PDCCH in SF #n of a primary component carrier CC # 1 that is a licensed band.
- an eNB When receiving carrier scheduling, when a PUSCH transmission interworking with a corresponding uplink grant is performed within a TxOP period, an eNB does not transmit an uplink grant activation message for activating a corresponding uplink grant to a UE. In this case, the UE also does not expect to receive an uplink grant activation message that activates the corresponding uplink grant from the eNB, and the UE transmits a PUSCH transmission time associated with an uplink grant reception time (ie, DL SF #n).
- the uplink grant reception time (ie, DL SF #n) is interworked.
- the PUSCH transmission time point (ie, UL SF # (n + k)) may be defined to follow the nearest UL available subframe after including SF # (n + 4).
- a PUSCH transmission time (ie, UL SF # (n + k)) linked with an uplink grant reception time (ie, DL SF #n) may vary according to N SF uses in a predefined TxOP period.
- the uplink grant activation message described above may be a sequence, i.e., a preamble, designated in advance for this purpose (for example, transmitted to CC # 2 configured as a downlink component carrier as an unlicensed band). For example, it may be a value of a specific field transmitted through a physical control channel (which is transmitted to CC # 1 set as a downlink component carrier) as a licensed band.
- the eNB may transmit an uplink grant activation message for activating a corresponding uplink grant to the UE.
- the UE also expects to receive an uplink grant activation message that activates the corresponding uplink grant from the eNB, and the UE receives an uplink grant previously received after the uplink grant activation message (that is, SF #n).
- FIG. 24 shows an example of performing PUSCH transmission according to the fifth embodiment of the present invention.
- the UE transmits an uplink from the eNB to CC # 2, which is an unlicensed band; grants DL SF # (n + l), DL SF # (n + 4), and DL SF # of licensed band CC # 1.
- CC # 2 which is an unlicensed band
- the eNB since the PUSCH transmission associated with an uplink grant of DL SF # (n + l) is performed in a TxOP period, that is, in UL SF # (n + 5), the eNB transmits DL SF # (n to the UE. The additional uplink grant activation message for activating the uplink grant received in + l) is not transmitted. Similarly, since the PUSCH transmission associated with the uplink grant of DL SF # (n + ll) is performed in a TxOP period, that is, UL SF # (n + 15), the eNB receives the UE in DL SF # (n + ll). The additional uplink grant activation message for activating the uplink grant is not transmitted.
- the uplink grant activation message explicitly includes downlink subframe index information on which an uplink grant which the eNB intends to activate is transmitted.
- the uplink grant active message transmitted in DL SF # (n + 12) is captured with downlink subframe index information of DL SF # (n + 4), so that the UE may receive a previous DL SF # ( The uplink grant received at n + 4) is activated at UL SF # (n + 13).
- the eNB and the UE may implicitly set the current uplink grant activation message to activate an uplink grant with the oldest transmission / reception time point.
- the eNB and the UE may implicitly configure that an uplink grant activation message received at DL SF #n is for activating an uplink grant received at the nearest DL SF including DL SF # (n-4). have.
- the uplink grant activation message may include (uplink) HARQ ID information activated by the eNB.
- the UE performs retransmission for previous uplink transmission (for example, the same (uplink) HARQ ID) based on the HARQ ID information included in the uplink grant activity message.
- retransmission for the initial uplink transmission transmitted in the TxOP period is the same (location) uplink subframe (in TxOP) as the subframe in which the initial uplink transmission is performed when the system uses CC # 2 again in the future.
- Retransmissions can only be restricted from That is, in FIG. 24, retransmission for the UL SF # (n + 5) may be performed in the UL SF # (n + 15).
- the above schemes can be extended even in a situation where the UE is scheduled from the eNB through a specific physical channel of CC # 2 (uplink grant for X # 2.
- the UE can access the CC through the specific physical channel of CC # 2 from the eNB.
- the time point for receiving the uplink grant for # 2 may be a time point when the eNB determines that the result of performing the carrier detection operation for CC # 2 is an IDLE state.
- the eNB determines that the result of performing the carrier detection operation on the CC # 2, which is an unlicensed band, is IDLE and sets a TxOP composed of N SFs, downlink data transmission blacks are used for all SFs constituting a specific TxOP.
- This method has the advantage of reducing the number of special SFs generated in one specific TxOP to a minimum.
- the length of TxOP used only for DL data transmission (ie, N_DL) and the length of TxOP used only for UL data transmission (ie, NJJ may be set to be the same or different from each other.
- the eNB may inform the UE through a higher layer signaling or a physical channel of a primary component carrier, which is a licensed band, or information about the length of a TxOP and the purpose of the TxOP, which is transmitted through an unlicensed band (X # 2).
- the eNB may transmit the information to the UE by including it in a designated preamble (or sequence) to inform the start point of the TxOP.
- the usage may be sequentially set according to the usage rules (order) of the TxOP which eNB informs the UE through the physical channel of the licensed primary component carrier (CC # 1) before the actual application of TxOP to the UE. .
- TxOP_DL downlink data transmission or uplink data transmission
- FIG. 25 shows an example of setting TxOP according to the sixth embodiment of the present invention.
- information about a length of a TxOP and a purpose of the TxOP is included by the eNB in a preamble (or sequence) transmitted to the UE in order to inform the UE of a start time of the TxOP in advance. It was.
- the first TxOP usage and the TxOP length are designated as downlink data transmission (ie, TxOP_DL) and 5, respectively, and the second TxOP usage is set. And it can be seen that the length of TxOP (ie, N_DL) is designated as the purpose of uplink data transmission (ie, TxOPJLL) and 3, respectively.
- the eNB also sends a CRTB to prevent another system from attempting to transmit data during the timing gap.
- the UE may receive such a grant.
- PUSCH transmission associated with an uplink grant may be performed by referring to a VTKvirtual timing index configured at a corresponding SF #n time point.
- the following proposed schemes can be extended and applied even when the eNB transmits a UL grant for CC # 2 to a UE through a specific physical control channel or physical data channel of CC # 2.
- the VTI is for the purpose of UL data transmission, which is set later when the UE receives an uplink grant through cross-carrier scheduling at a specific time point of TxOP_DL.
- This parameter indicates at what timing in TxOP (ie, TxOP—UL) a PUSCH should be transmitted. For example, if the UE receives an uplink grant with cross-carrier scheduling at DL SF #n of TxOP_DL and the VTI at DL SF #n is set to 1, the UE firstly receives the first uplink subband of TxOPJJL. Uplink grant-based PUSCH transmission is performed at the time of DL SF #n in a frame.
- the VTI is different from the conventional parameter meaning an absolute time difference between the time of receiving the uplink grant and the time of the PUSCH transmission, and the carrier aggregation scheme is applied by using the unlicensed band where the fixed PUSCH transmission time cannot be guaranteed. This can be applied very effectively.
- the reference point of the VTI may be implicitly assumed to be the first uplink subframe of TxOPJJL, or may be explicitly specified through higher layer signaling or a physical channel.
- the information on the VTI for each downlink subframe may be included in a preamble transmitted by the eNB to inform the UE of the start time of the TxOP or transmitted through the preamble designated for VTI information transmission (ie, half).
- a preamble transmitted by the eNB to inform the UE of the start time of the TxOP or transmitted through the preamble designated for VTI information transmission (ie, half).
- VTI information transmission ie, half.
- the information on the VTI for each downlink subframe may inform the UE through the physical channel or higher layer signaling of CC # 1 or CC # 2 before data transmission through TxOP is actually performed.
- the information on the VTI for each downlink subframe may be set according to a VTI allocation rule that the eNB informs the UE through a physical channel or higher layer signaling of CC # 1 or CC # 2 or a predefined VTI allocation rule ( Static technique). This method can be used to maintain the VTI information for each downlink subframe at a fixed value for a relatively long time even if the TxOP configuration is repeated.
- the eNB informs the UE of VTI information about N_DL_MAX DL SFs by using higher layer signaling before TxOP_DL of a specific length is set, which is fixed for a long time. Can be operated with VTI. Also, as the VTI allocation rule, it may be assumed that the VTI is implicitly allocated in ascending order from the first DL SF of the TxOP_DL in which the eNB and the UE are configured, and such a method does not require additional signaling.
- the VTI for the DL SF may be implicitly assumed in ascending order only when an uplink grant is received in the CCS at any DL SF.
- the VTI for the downlink subframe is CC # 1 or CC # It may be informed through 2 physical channels or higher layer signaling. (Ie dynamic technique)
- eNB when eNB informs UE of VTI information for downlink subframes through the physical channel of CC # 1 or CC # 2, downlink for transmission of existing uplink grant control information (Downlink control information; DCI) or to add or update the fields for this purpose, it is possible to operate by "defined further new DCI.
- the eNB may inform the UE by using a preamble previously defined for this purpose for VTI information for each downlink subframe.
- the cross-carrier in that downlink subframe is not received by the scheduling or that the PUSCH transmission associated with the uplink grant is not performed even if the uplink grant is received by the cross carrier scheduling.
- the definition of the above-described VTI may be defined as a parameter for indicating at which timing the uplink grant received at a certain time in the TxOP_DL interval increment previously set in order for the UE to transmit a PUSCH at a specific time point of the TxOPJL. For example, if the UE attempts to perform PUSCH transmission in the first UL SF of TxOPJL with VTI set to 1, the UE is the most in the previously configured TxOP_DL interval. It refers to the last uplink grant received.
- FIG. 26 illustrates an example of performing PUSCH transmission according to the sixth embodiment of the present invention.
- FIG. 26 illustrates the same situation as that of FIG. 25, in which an eNB transmits an uplink grant for CC # 2 to a UE by SF # (n + l), SF # (n + 3), SF # (n + 4)
- FIG. 26 assumes that cross carrier scheduling
- FIG. 26 assumes that information on VTI for each downlink subframe is included in a preamble transmitted by the eNB to inform the UE of a start time of TxOP.
- VTIs at times of SF # (n + l), SF # (n + 3), SF # (n + 4) where an uplink grant is received through cross-carrier scheduling are 1, 2, If it is set to 3, PUSCH transmissions based on uplink grants received by cross-carrier scheduling at SF # (n + l), SF # (n + 3), and SF # (n + 4) of TxOP_DL are respectively included in TxOPJL.
- ACK / NACK for the uplink grant is replaced by PUSCH transmission, not separately transmitted.
- the eNB transmits an uplink grant for CC # 2, which is an unlicensed band, to the UE through a PDCCH of CC # 1, which is a licensed band
- the UE sends ACK / NACK for reception of the corresponding uplink grant. It is proposed to inform the eNB using PUCCH resources linked to the CCE index of the uplink grant.
- the ACK / NACK for the uplink grant reception is a kind of acknowledgment message for the uplink grant reception informed by the UE to the eNB.
- the eNB sends a higher layer signaling or physical channel ( X # 1 or CC # 2) to the UE.
- a separate 1 ⁇ ⁇ ⁇ 0 £ 3 may be informed, that is, ACK / NACK for uplink grant reception may be efficiently multiplexed and transmitted to the RB serving the N_pucch_offset.
- the eNB when the eNB transmits a UL grant for CC # 2, which is an unlicensed band to CCS, to the UE through a DL control channel of the licensed band CC # 1, that is, PDCCH, the UE transmits the CC # 2 through Since the PUSCH transmission is not guaranteed at a predetermined time point (that is, the PUSCH transmission time associated with the UL grant transmission time), the eNB cannot quickly determine whether the UE has not received the UL grant. This problem can be solved.
- Embodiments of the present invention can be applied to a case in which a specific CC is commonly used among a plurality of cells, and the purpose of the CC is independently set for each cell.
- embodiments of the present invention can be applied to change the use of a specific radio resource previously allocated to a secondary component carrier (SCC) in a primary component carrier (PCC) using cross carrier scheduling (CCS).
- SCC secondary component carrier
- PCC primary component carrier
- CCS cross carrier scheduling
- the present invention applies the present invention when the usage of a specific resource (defined in advance) of each component carrier used for communication between a receiving end and a transmitting end in a CA environment changes (dynamically) according to the load state of the system. You can do it.
- the contents of the present invention can be extended and applied even when a particular cell dynamically changes the use of an existing specific radio resource according to a system load condition.
- the contents of the present invention can be extended and applied in all situations where PDCCH or E-PDCCH based communication is performed.
- the contents of the present invention can be extended and applied to the interference mitigation cooperative operation between cells using the extended carrier (carrier) for additional communication, by setting the use of radio resources on the extended carrier or sharing the extended carrier. have.
- the proposed schemes can be used for D2D communication by performing D2D communication in a specific band allocated for such communication purpose under a device-to-device (D2D) communication environment or by changing the use of a predetermined radio resource. Even if the extension can be applied.
- FIG. 27 illustrates a block diagram of a communication device according to an embodiment of the present invention.
- the communication device 2700 includes a processor 2710, a memory 2720, RF modules 2730, display modules 2740, and user interface modules 2750.
- the communication device 2700 is shown for convenience of description and some models may be omitted.
- the communication device 2700 may further include the necessary modules.
- some of the hairs in the communication device 2700 can be divided into more granular hairs.
- the processor 2710 is configured to perform an operation according to the embodiment of the present invention illustrated with reference to the drawings. In detail, the detailed operation of the processor 2710 may refer to the contents described with reference to FIGS. 1 to 26.
- the memory 2720 is connected to the processor 2710 and stores an operating system, an application, a program code, data, and the like.
- the RF modules 2730 are connected to the processor 2710 and perform a function of converting a baseband signal into a radio signal or converting a radio signal into a baseband signal. For this purpose, the RF modules 2730 perform analog conversion, amplification, filtering and frequency up-conversion or their reverse processes.
- Display modules 2740 are connected to processor 2710 and display various information.
- the display module 2740 may use well-known elements such as, but not limited to, Liquid Crystal Dislay (LCD), Light Emitting Diode (LED), and Zero Light Emitting Diode (0LED).
- the user interface models 2750 are connected to the processor 2710 and can be configured with a combination of well known user interfaces such as a keypad, touch screen, and the like.
- 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 applicat ion specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), and PLDs (pr ogr ammab 1). e logic devices), field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, and the like.
- ASICs applicat ion specific integrated circuits
- DSPs digital signal processors
- DSPDs digital signal processing devices
- PLDs pr ogr ammab 1
- 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 modules, procedures, functions, etc. that perform 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.
- a method for transmitting and receiving a signal and a device for transmitting and receiving a signal in a wireless communication system to which the carrier aggregation technique is applied as described above have been described with reference to an example applied to a 3GPP LTE system, but also applied to various wireless communication systems in addition to the 3GPP LTE system. It is possible to do
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Abstract
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Priority Applications (3)
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US14/003,550 US9363798B2 (en) | 2011-03-11 | 2012-03-07 | Method and device for terminal to transmit/receive signal in wireless communication system having carrier aggregation technique applied thereto |
CN201280012878.6A CN103430467B (zh) | 2011-03-11 | 2012-03-07 | 终端在应用了载波聚合技术的无线通信系统中发送/接收信号的方法和装置 |
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Also Published As
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CN103430467B (zh) | 2016-05-11 |
KR102088021B1 (ko) | 2020-03-11 |
CN103430467A (zh) | 2013-12-04 |
US20130336302A1 (en) | 2013-12-19 |
WO2012124924A3 (ko) | 2012-12-20 |
WO2013008065A1 (ko) | 2013-01-17 |
US9363798B2 (en) | 2016-06-07 |
US9288795B2 (en) | 2016-03-15 |
US20140003387A1 (en) | 2014-01-02 |
KR20140010385A (ko) | 2014-01-24 |
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