WO2017131465A1 - Procédé et appareil d'émission de signaux dans un système de communication dans une bande sans licence, procédé et appareil de programmation de liaison montante, et procédé et appareil de transmission d'informations sur intervalle de mesure d'état de canal - Google Patents

Procédé et appareil d'émission de signaux dans un système de communication dans une bande sans licence, procédé et appareil de programmation de liaison montante, et procédé et appareil de transmission d'informations sur intervalle de mesure d'état de canal Download PDF

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Publication number
WO2017131465A1
WO2017131465A1 PCT/KR2017/000954 KR2017000954W WO2017131465A1 WO 2017131465 A1 WO2017131465 A1 WO 2017131465A1 KR 2017000954 W KR2017000954 W KR 2017000954W WO 2017131465 A1 WO2017131465 A1 WO 2017131465A1
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WO
WIPO (PCT)
Prior art keywords
subframe
information
uplink
base station
scheduling
Prior art date
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PCT/KR2017/000954
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English (en)
Korean (ko)
Inventor
엄중선
정회윤
유성진
박승근
Original Assignee
한국전자통신연구원
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020170012229A external-priority patent/KR102574506B1/ko
Application filed by 한국전자통신연구원 filed Critical 한국전자통신연구원
Priority to CN201780003888.6A priority Critical patent/CN108271430B/zh
Priority to EP17744586.3A priority patent/EP3410613A4/fr
Priority to US15/771,362 priority patent/US11140690B2/en
Publication of WO2017131465A1 publication Critical patent/WO2017131465A1/fr

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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
    • H04B7/2656—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA] for structure of frame, burst
    • 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
    • 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
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/32—Hierarchical cell structures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • 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
    • H04W72/232—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal the control data signalling from the physical layer, e.g. DCI signalling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]

Definitions

  • the present invention relates to a method and apparatus for configuring and transmitting a signal through a time division duplex (TDD) in an unlicensed band wireless communication system.
  • TDD time division duplex
  • the present invention also relates to an uplink scheduling method and apparatus.
  • the present invention also relates to a method and apparatus for transmitting information about a channel state measurement interval.
  • Wireless communication technologies may be classified into wireless communication technologies using licensed bands and wireless communication technologies using unlicensed bands (eg, industrial scientific medical bands) according to the band used. have. Since the use of the licensed band is exclusively given to one operator, the wireless communication technology using the licensed band can provide better reliability and communication quality than the wireless communication technology using the unlicensed band.
  • licensed bands eg, industrial scientific medical bands
  • LTE long term evolution
  • 3GPP 3rd generation partnership project
  • WLANs wireless local area networks
  • IEEE Institute of Electrical and Electronics Engineers 802.11 standard.
  • AP access point
  • STA station
  • WLANs wireless local area networks
  • Unlicensed band cells occupy the channel opportunistically and cannot occupy the channel continuously for a certain period of time. Therefore, in order to use the uplink and the downlink of the unlicensed band cell in a time division manner, a channel access procedure, a frame configuration method, a scheduling method, and a method of transmitting uplink and downlink response messages need to be defined.
  • An object of the present invention is to provide a method and apparatus for constructing a signal and transmitting the same through a time division scheme (TDD) in an unlicensed band wireless communication system.
  • TDD time division scheme
  • a method for transmitting an uplink signal in an unlicensed band by a terminal may include receiving first scheduling information for scheduling at least one uplink subframe from a base station in a first downlink subframe; Receiving second scheduling information for determining a transmission time point of the uplink signal from the base station in a second downlink subframe after the first downlink subframe; And transmitting the uplink signal in a first uplink subframe corresponding to the transmission time point among the at least one uplink subframe.
  • the transmission method of the terminal may further include invalidating the first scheduling information when the second scheduling information is not received within a predetermined time from the first downlink subframe.
  • the predetermined time may be indicated by a timing offset field included in first downlink control information (DCI).
  • DCI first downlink control information
  • the predetermined time may be included in the first scheduling information or signaled to the terminal through a radio resource control (RRC) message.
  • RRC radio resource control
  • Receiving the second scheduling information comprises receiving the second scheduling information through at least one of a physical hybrid automatic repeat request indicator channel (PHICH) and common downlink control information (DCI) of an unlicensed band cell. can do.
  • PHICH physical hybrid automatic repeat request indicator channel
  • DCI common downlink control information
  • the transmitting of the uplink signal may include transmitting the uplink signal in the first uplink subframe when the terminal belongs to a first terminal group indicated by the terminal group information included in the second scheduling information. It may include a step.
  • the transmitting of the uplink signal may include: checking an occupancy state of an unlicensed band channel for 25us time before transmitting the uplink signal; And when the occupied state of the unlicensed band channel is an unoccupied state, transmitting the uplink signal.
  • an uplink scheduling method of a base station may include including first information indicating a scheduled uplink subframe in first downlink control information (DCI); Including second information indicating a scheduled second uplink subframe in a second DCI different from the first DCI; And transmitting the first DCI and the second DCI in a first downlink subframe.
  • DCI downlink control information
  • an interval between the start of the first downlink subframe and the start of the first uplink subframe is (4+ It may correspond to X) subframes.
  • Including the first information in the first DCI may include including, in the first DCI, third information indicating the number of uplink subframes that are continuously scheduled.
  • the position of the first uplink subframe may be determined based on the first information.
  • the position of the first uplink subframe may be determined regardless of the first information.
  • the number of uplink subframes that are continuously scheduled may be determined based on the third information.
  • the number of uplink subframes that are continuously scheduled may be determined to be 1 regardless of the third information.
  • the uplink scheduling method of the base station includes information for triggering a transmission of a sounding reference signal (SRS) within a subframe after a predetermined time from the first downlink subframe, and the first downlink subframe.
  • the transmission may further include.
  • the method may further include transmitting in the first downlink subframe.
  • SRS sounding reference signal
  • a method for the base station to transmit information about the first interval in which the occupancy state of the unlicensed band channel is measured.
  • uplink transmission among a plurality of time domain symbols included in the first subframe to inform a terminal whether the first interval is set in a first time slot included in a first subframe.
  • the first information may indicate a first time domain symbol that is present in the front of the plurality of time domain symbols.
  • the first information may indicate a time domain symbol different from the first time domain symbol among the plurality of time domain symbols.
  • the second information may indicate a first time domain symbol that is located last of the plurality of time domain symbols.
  • the second information may indicate a time domain symbol different from the first time domain symbol among the plurality of time domain symbols.
  • the transmitting method of the base station transmitting the first information and the second information to the terminal through at least one of UE-specific downlink control information (DCI) and common DCI. It may further include.
  • DCI downlink control information
  • the method may further include transmitting.
  • the first pair of bits may include one bit for the first information and one bit for the second information.
  • the transmitting method of the base station may include: changing a value of the first bit pair when the first interval for the first subframe is changed; And transmitting the changed first bit pair and the second bit pair to the terminal at a second time point after the first time point.
  • TDD time division scheme
  • 1, 2, 3, and 4 illustrate an embodiment of a wireless communication network.
  • FIG. 5 is a diagram illustrating a communication node constituting a wireless communication network.
  • FIG. 6 is a diagram illustrating an unlicensed band downlink transmission burst according to an embodiment of the present invention.
  • 7A, 7B, 7C, and 7D are diagrams illustrating a CCA configuration of an uplink transmission burst.
  • FIG 8 illustrates a method of signaling CCA symbol configuration information through a common DCI according to an embodiment of the present invention.
  • FIG. 9 is a diagram illustrating a method of updating CCA symbol configuration information through a common DCI according to an embodiment of the present invention.
  • 10A and 10B illustrate an SRS configuration position according to a CCA section according to an embodiment of the present invention.
  • 11A and 11B are diagrams illustrating an unlicensed band uplink transmission burst according to an embodiment of the present invention.
  • 12A, 12B, and 12C are diagrams illustrating switching subframes included in an unlicensed transmission burst according to an embodiment of the present invention.
  • FIG. 13 is a diagram illustrating a multiple uplink scheduling method according to an embodiment of the present invention.
  • a component when referred to as being 'connected' or 'connected' to another component, the component may be directly connected to or connected to the other component, but in between It will be understood that may exist.
  • a component when referred to as 'directly connected' or 'directly connected' to another component, it should be understood that there is no other component in between.
  • the term 'comprises' or 'having' is only intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more. It is to be understood that it does not exclude in advance the possibility of the presence or addition of other features, numbers, steps, actions, components, parts or combinations thereof.
  • 'and / or' includes any combination of the plurality of listed items or any of the plurality of listed items.
  • 'A or B' may include 'A', 'B', or 'both A and B'.
  • a terminal is a mobile terminal, a station, a mobile station, an advanced mobile station, a high reliability mobile station, a subscriber station. may refer to a subscriber station, a portable subscriber station, an access terminal, a user equipment (UE), a node, a device, and the like. It may also include all or part of the functionality of a station, mobile station, advanced mobile station, high reliability mobile station, subscriber station, portable subscriber station, access terminal, user equipment, node, device, and the like.
  • a base station includes an advanced base station, a high reliability base station, a node B (node B, NB), an advanced node B (evolved node B, eNodeB, eNB, radio base station, radio transceiver, access point, access node, radio access station, base transceiver station May refer to a mobile multihop relay (BSR) -BS, a relay station serving as a base station, a high reliability relay station serving as a base station, a repeater, a macro base station, a small base station, etc.
  • BSR mobile multihop relay
  • Base Station Advanced Base Station, High Reliability Base Station, Node B, eNodeB, Wireless Base Station, Wireless Transceiver, Access Point, Access Node, Wireless Access Station, Transceiver Base Station, MMR-BS, Repeater, High Reliability Repeater, Repeater, Macro Base Station, Compact All or work of base station etc There's also an included feature.
  • TDD time division duplex
  • a channel access method a method of configuring a frame of an unlicensed band cell and a method of transmitting frame configuration information
  • a scheduling method for allocating resources to a terminal a scheduling method for allocating resources to a terminal
  • a channel state A method of transmitting the measurement signal and the response signal will be described.
  • 1, 2, 3, and 4 illustrate an embodiment of a wireless communication network.
  • FIGS. 1 to 4 illustrate a wireless communication network to which the method and apparatus according to the embodiment of the present invention are applied.
  • the wireless communication network to which the method and apparatus according to the embodiment according to the present invention is applied is not limited to the wireless communication network described herein.
  • the method and apparatus according to the embodiment of the present invention can be applied to various wireless communication networks.
  • 1 illustrates an embodiment of a wireless communication network.
  • the first base station 110 may support cellular communication (eg, LTE, LTE-A (advanced), LTE-U (unlicensed, etc.) as defined in the 3GPP standard). have.
  • the first base station 110 may include multiple input multiple output (MIMO) (eg, single user (MI), multi user (MI), multi-user (MIMO), massive MIMO, etc.), coordinated multipoint (COMP), carrier aggregation, and the like. (CA: carrier aggregation) may be supported.
  • MIMO multiple input multiple output
  • MI single user
  • MI multi user
  • MIMO multi-user
  • massive MIMO massive MIMO
  • CA coordinated multipoint
  • CA carrier aggregation
  • the first base station 110 may operate in the licensed band F1 and form a macro cell.
  • the first base station 110 may be connected to another base station (eg, the second base station 120, the third base station 130, etc.) through an ideal backhaul or non-idal backhaul.
  • the second base station 120 may be located within the coverage of the first base station 110.
  • the second base station 120 may operate in the unlicensed band F3 and form a small cell.
  • the third base station 130 may be located within the coverage of the first base station 110.
  • the third base station 130 may operate in the unlicensed band F3 and form a small cell.
  • Each of the second base station 120 and the third base station 130 may support a WLAN defined in the IEEE 802.11 standard.
  • Each of the first base station 110 and the terminal (eg, UE) connected to the first base station 110 may transmit and receive a signal through a carrier aggregation CA between the licensed band F1 and the unlicensed band F3. .
  • FIG. 2 illustrates another embodiment of a wireless communication network.
  • each of the first base station 210 and the second base station 220 may support cellular communication (eg, LTE, LTE-A, LTE-U, etc. defined in the 3GPP standard). .
  • Each of the first base station 210 and the second base station 220 may support MIMO (eg, SU-MIMO, MU-MIMO, large-scale MIMO, etc.), CoMP, Carrier Aggregation (CA), and the like.
  • MIMO eg, SU-MIMO, MU-MIMO, large-scale MIMO, etc.
  • CoMP Carrier Aggregation
  • CA Carrier Aggregation
  • Each of the first base station 210 and the second base station 220 may operate in the licensed band F1 and form a small cell.
  • Each of the first base station 210 and the second base station 220 may be located within the coverage of the base station forming the macro cell.
  • the first base station 210 may be connected to the third base station 230 through an ideal backhaul or a non-idal backhaul.
  • the second base station 220 may be connected to the fourth base station 240 through an ideal backhaul or a non-idal backhaul.
  • the third base station 230 may be located within the coverage of the first base station 210.
  • the third base station 230 may operate in the unlicensed band F3 and form a small cell.
  • the fourth base station 240 may be located within the coverage of the second base station 220.
  • the fourth base station 240 may operate in the unlicensed band F3 and form a small cell.
  • Each of the third base station 230 and the fourth base station 240 may support a WLAN defined in the IEEE 802.11 standard.
  • Each of the first base station 210, the terminal connected to the first base station 210, the second base station 220, and the terminal connected to the second base station 220 may be provided between the licensed band F1 and the unlicensed band F3. Signals may be transmitted and received via carrier aggregation (CA).
  • CA carrier aggregation
  • 3 illustrates another embodiment of a wireless communication network.
  • each of the first base station 310, the second base station 320, and the third base station 330 is a cellular communication (eg, LTE, LTE-A, LTE defined in the 3GPP standard). -U, etc.).
  • Each of the first base station 310, the second base station 320, and the third base station 330 may include MIMO (eg, SU-MIMO, MU-MIMO, large scale MIMO, etc.), CoMP, Carrier Aggregation (CA), and the like.
  • MIMO eg, SU-MIMO, MU-MIMO, large scale MIMO, etc.
  • CoMP Carrier Aggregation
  • CA Carrier Aggregation
  • the first base station 310 may operate in the licensed band F1 and form a macro cell.
  • the first base station 310 may be connected to another base station (eg, the second base station 320, the third base station 330, etc.) through an ideal backhaul or a non-idal backhaul.
  • the second base station 320 may be located within the coverage of the first base station 310.
  • the second base station 320 may operate in the licensed band F1 and form a small cell.
  • the third base station 330 may be located within the coverage of the first base station 310.
  • the third base station 330 may operate in the licensed band F1 and form a small cell.
  • the second base station 320 may be connected to the fourth base station 340 through an ideal backhaul or a non-idal backhaul.
  • the fourth base station 340 may be located within the coverage of the second base station 320.
  • the fourth base station 340 may operate in the unlicensed band F3 and form a small cell.
  • the third base station 330 may be connected to the fifth base station 350 through an ideal backhaul or a non-idal backhaul.
  • the fifth base station 350 may be located within the coverage of the third base station 330.
  • the fifth base station 350 may operate in the unlicensed band F3 and form a small cell.
  • Each of the fourth base station 340 and the fifth base station 350 may support a WLAN defined in the IEEE 802.11 standard.
  • Each terminal connected to may transmit and receive a signal through a carrier aggregation CA between the licensed band F1 and the unlicensed band F3.
  • FIG. 4 illustrates another embodiment of a wireless communication network.
  • each of the first base station 410, the second base station 420, and the third base station 430 is a cellular communication (eg, LTE, LTE-A, LTE as defined in the 3GPP standard). -U, etc.).
  • Each of the first base station 410, the second base station 420, and the third base station 430 includes MIMO (eg, SU-MIMO, MU-MIMO, large scale MIMO, etc.), CoMP, Carrier Aggregation (CA), and the like.
  • MIMO eg, SU-MIMO, MU-MIMO, large scale MIMO, etc.
  • CoMP Carrier Aggregation
  • CA Carrier Aggregation
  • the first base station 410 may operate in the licensed band F1 and form a macro cell.
  • the first base station 410 may be connected to another base station (eg, the second base station 420, the third base station 430, etc.) through an ideal backhaul or non-idal backhaul.
  • the second base station 420 may be located within the coverage of the first base station 410.
  • the second base station 420 may operate in the licensed band F2 and form a small cell.
  • the third base station 430 may be located within the coverage of the first base station 410.
  • the third base station 430 may operate in the licensed band F2 and form a small cell.
  • Each of the second base station 420 and the third base station 430 may operate in a licensed band F2 different from the licensed band F1 in which the first base station 410 operates.
  • the second base station 420 may be connected to the fourth base station 440 through an ideal backhaul or a non-idal backhaul.
  • the fourth base station 440 may be located within the coverage of the second base station 420.
  • the fourth base station 440 may operate in the unlicensed band F3 and form a small cell.
  • the third base station 430 may be connected to the fifth base station 450 through an ideal backhaul or a non-idal backhaul.
  • the fifth base station 450 may be located within the coverage of the third base station 430.
  • the fifth base station 450 may operate in the unlicensed band F3 and form a small cell.
  • Each of the fourth base station 440 and the fifth base station 450 may support a WLAN defined in the IEEE 802.11 standard.
  • Each of the terminals connected to the first base station 410 and the first base station 410 may transmit and receive a signal through a carrier aggregation CA between the licensed band F1 and the unlicensed band F3.
  • Each of the second base station 420, the terminal connected to the second base station 420, the third base station 430, and the terminal connected to the third base station 430 may be provided between the licensed band F2 and the unlicensed band F3. Signals may be transmitted and received via carrier aggregation (CA).
  • CA carrier aggregation
  • a communication node constituting a wireless communication network may transmit a signal based on a listen before talk (LBT) procedure in an unlicensed band. That is, the communication node may determine the occupied state of the unlicensed band by performing an energy detection operation. The communication node may transmit a signal when it is determined that the unlicensed band is in an idle state. In this case, the communication node may transmit a signal when the unlicensed band is in an idle state during a contention window according to a random backoff operation. On the other hand, if it is determined that the state of the unlicensed band is busy, the communication node may not transmit a signal.
  • LBT listen before talk
  • the communication node may transmit a signal based on a carrier sensing adaptive transmission (CSAT) procedure. That is, the communication node may transmit a signal based on a preset duty cycle. The communication node may transmit a signal if the current duty cycle is a duty cycle assigned for a communication node that supports cellular communication. On the other hand, a communication node may not transmit a signal if the current duty cycle is a duty cycle allocated for a communication node that supports communication other than cellular communication (eg, WLAN, etc.). The duty cycle may be adaptively determined based on the number of communication nodes that are in the unlicensed band and support the WLAN, the usage state of the unlicensed band, and the like.
  • CSAT carrier sensing adaptive transmission
  • the communication node may perform discontinuous transmission in the unlicensed band. For example, when a maximum transmission duration or maximum channel occupancy time (COT) is set in the unlicensed band, the communication node may transmit a signal within the maximum transmission period. If the communication node fails to transmit all the signals within the current maximum transmission period, it can transmit the remaining signals in the next maximum transmission period. In addition, the communication node may select a carrier having relatively little interference in the unlicensed band and may operate on the selected carrier. In addition, when a communication node transmits a signal in an unlicensed band, the communication node may adjust transmission power to reduce interference with other communication nodes.
  • COT channel occupancy time
  • the communication node may be a code division multiple access (CDMA) based communication protocol, a wideband CDMA (WCDMA) based communication protocol, a time division multiple access (TDMA) based communication protocol, or a frequency division multiple access (FDMA) based communication protocol. It may support a single carrier (SC) -FDMA based communication protocol, an orthogonal frequency division multiplexing (OFDM) based communication protocol, an orthogonal frequency division multiple access (OFDMA) based communication protocol, and the like.
  • CDMA code division multiple access
  • WCDMA wideband CDMA
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • SC single carrier
  • OFDM orthogonal frequency division multiplexing
  • OFDMA orthogonal frequency division multiple access
  • the communication node 500 may be a base station, a terminal, or the like described herein.
  • the communication node 500 may include at least one processor 510, a transceiver 520 connected to a network to perform communication, and a memory 530.
  • the communication node 500 may further include a storage device 540, an input interface device 550, an output interface device 560, and the like. Components included in the communication node 500 may be connected by a bus 570 to communicate with each other.
  • the processor 510 may execute a program command stored in at least one of the memory 530 and the storage device 540.
  • the processor 510 may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which methods according to embodiments of the present invention are performed.
  • the processor 510 may be configured to implement the procedures, functions, and methods described in connection with embodiments of the present invention.
  • the processor 510 may control each component of the communication node 500.
  • Each of the memory 530 and the storage device 540 may store various information related to the operation of the processor 510.
  • Each of the memory 530 and the storage device 540 may be configured as at least one of a volatile storage medium and a nonvolatile storage medium.
  • the memory 530 may be configured as at least one of a read only memory (ROM) and a random access memory (RAM).
  • the transceiver 520 may transmit or receive a wired signal or a wireless signal.
  • the communication node 500 may have a single antenna or multiple antennas.
  • a communication node may operate as follows. Even when a method (e.g., transmitting or receiving a signal) is performed among the communication nodes (e.g., transmitting or receiving a signal), the second communication node corresponding to the first communication node corresponds to the method performed by the first communication node. Method (eg, reception or transmission of a signal). That is, when the operation of the terminal is described, the base station corresponding to the terminal may perform an operation corresponding to the operation of the terminal. On the contrary, when the operation of the base station is described, the terminal corresponding to the base station may perform an operation corresponding to the operation of the base station.
  • a method e.g., transmitting or receiving a signal
  • Method e.g, reception or transmission of a signal
  • one subframe In long term evolution (LTE) downlink (DL), one subframe includes two time slots (a first time slot and a second time slot). Each time slot consists of seven or six time domain symbols (e.g., OFDM symbols). That is, one subframe may include 14 time domain symbols (eg, time domain symbols 0 through 13) or 12 time domain symbols (eg, time domain symbols 0 through 11).
  • the time domain symbol may be an OFDM symbol, an OFDMA symbol, an SC-FDMA symbol, or the like according to a multiple access scheme. For example, where OFDM symbols are used herein, the OFDM symbols may be replaced with SC-FDMA symbols and vice versa.
  • the downlink control channel of the licensed band may include, for example, a physical control format indicator channel (PCFICH), a physical downlink control channel (PDCCH), a physical hybrid automatic repeat request indicator channel (PHICH), and the like.
  • PCFICH physical control format indicator channel
  • PDCCH physical downlink control channel
  • PHICH physical hybrid automatic repeat request indicator channel
  • a physical downlink shared channel (PDSCH) which is a data channel for data transmission, is basically allocated to the remaining part of the subframe, and an enhanced physical downlink control channel (EPDCCH) can be allocated to some resource blocks (RBs).
  • the first OFDM symbol in the subframe includes a PCFICH for transmitting information about the number of OFDM symbols used for transmission of the control channel.
  • the control channel region may include a PHICH for transmitting a hybrid automatic repeat request (HARQ) ACK / NACK (acknowledgment / negative-acknowledgment) signal, which is response information for uplink (UL) transmission.
  • HARQ hybrid automatic repeat request
  • NACK acknowledgenowledgment / negative-acknowledgment
  • UL uplink
  • DCI Downlink control information
  • the DCI may include resource allocation information or resource control information for the terminal and the plurality of terminal groups.
  • the DCI may include uplink scheduling information, downlink scheduling information, an uplink transmit power control command, and the like.
  • DCI which is control information transmitted through the PDCCH or the ePDCCH, has a different format according to the type and number of information fields, the number of bits of each information field, and the like.
  • DCI formats 0, 3, 3A, 4, and 4A are defined for uplink.
  • DCI formats 1, 1A, 1B, 1C, 1D, 2, 2A, 2B, 2C, and 2D may be defined for downlink.
  • Each DCI format includes a carrier indicator field (CIF), an RB assignment, a modulation coding scheme (MCS), a redundancy version (RV), a new data indicator (NDI), a transmit power control (TPC), and a HARQ process.
  • CIF carrier indicator field
  • MCS modulation coding scheme
  • RV redundancy version
  • NDI new data indicator
  • TPC transmit power control
  • control information such as a number, a precoding matrix indicator (PMI) confirmation, a hopping flag, a flag field, and the like are optionally included according to the format. Accordingly, the size of control information suitable for the DCI format may vary. In addition, the same DCI format may be used for transmitting two or more types of control information. In this case, the control information is distinguished by the flag field of the DCI format. Table 1 below summarizes the information included in each DCI format.
  • the PDCCH (or ePDCCH) is transmitted through aggregation of one or a plurality of consecutive control channel elements (CCEs) (or enhanced CCEs (eCCEs)).
  • CCEs control channel elements
  • eCCEs enhanced CCEs
  • (e) CCE is a logical allocation unit and consists of a plurality of resource element groups (REGs).
  • the number of bits transmitted through (e) PDCCH is determined according to the relationship between the number of (e) CCEs and the code rate provided by (e) CCEs.
  • the control information transmitted through the (e) PDCCH is attached with a cyclic redundancy check (CRC) for error detection.
  • CRC cyclic redundancy check
  • an identifier RNTI radio network temporary identifier
  • UE PDCCH reception target
  • PDCCH reception purpose e.g. UE
  • the CRC scrambled based on the RNTI is attached to the control information transmitted through (e) PDCCH.
  • Type and value of RNTI can be summarized as shown in Table 2 below.
  • An identifier associated with an unlicensed band cell may be defined as follows.
  • an identifier related to an unlicensed band cell is referred to as an unlicensed cell-RNTI (U-RNTI) or CC-RNTI (eg, a designated identifier of common information for an unlicensed band) for convenience.
  • U-RNTI or CC-RNTI as defined herein may be named differently according to information of an unlicensed band cell.
  • the value for the U-RNTI or CC-RNTI may be delivered to the terminal by an upper layer message or a radio resource control (RRC) message.
  • RRC radio resource control
  • the value of U-RNTI or CC-RNTI as defined herein may be known through RRC signaling.
  • the DCI including the CRC masked through the U-RNTI or CC-RNTI may be transmitted through the unlicensed band PDCCH common search space.
  • the DCI including the CRC masked through the U-RNTI or CC-RNTI may include common control information of an unlicensed band cell. For example, information on a partial subframe (eg, a length less than 1 ms transmission time interval (TTI)) of the downlink transmission burst may be included in the DCI.
  • TTI transmission time interval
  • common control information of the unlicensed band uplink may be included in the DCI.
  • a counter value of random backoff for channel access of an uplink transmission burst may be included in the DCI.
  • the number of contiguous uplink subframes scheduled may be designated via DCI.
  • Frame structure type 3 (FST-3) of the LTE system is applied to a licensed-assisted-access (LAA) secondary cell (LAA) having a normal cyclic prefix (CP).
  • LAA licensed-assisted-access
  • LAA secondary cell
  • CP normal cyclic prefix
  • FST-3 may be configured as a contiguous set of downlink subframes (1ms long) (hereinafter, referred to as 'downlink transmission burst').
  • a starting downlink partial subframe consisting of a second time slot or a ending downlink partial subframe consisting of a time domain symbol having a length of a downlink pilot time slot (DwPTS) is a start of a downlink transmission burst. And may be included at the end, respectively.
  • DwPTS downlink pilot time slot
  • a channel occupation signal may be included for the purpose of channel occupation.
  • FIG. 6 is a diagram illustrating an unlicensed band downlink transmission burst according to an embodiment of the present invention.
  • two types of downlink partial subframes eg, a starting downlink partial subframe composed of second time slots, a last downlink partial subframe having a DwPTS length
  • M eg, downlink transmission bursts
  • downlink subframes eg, 1 ms TTI subframes
  • channel occupancy signals located in front of and behind a downlink transmission burst.
  • the partial subframe or channel occupancy signal may not be included in the downlink transmission burst.
  • the FST-3 may also be configured as a contiguous set of uplink subframes (hereinafter, 'uplink transmission burst').
  • the uplink transmission burst may be defined as a contiguous uplink set from a transmission point of each terminal, or may be defined as a contiguous uplink set from a reception point of a base station.
  • Each subframe of the uplink transmission burst may include a channel state measurement (eg, clear channel assessment) section for checking whether a channel is occupied or empty.
  • the CCA interval (eg, the interval in which the occupied state of the unlicensed band channel is measured) may be configured in front of the subframe and may be configured of at least one SC-FDMA symbol.
  • the CCA period may be configured behind the subframe and may be composed of at least one SC-FDMA symbol.
  • the CCA section configured at the front or the rear of the subframe may be configured in all uplink subframes or only in a specific uplink subframe.
  • the UE receives related information included in the DCI of the downlink granting a specific uplink subframe including the CCA interval and includes the CCA interval.
  • a specific uplink subframe can be identified.
  • the UE is in a downlink including a DCI granting a specific uplink subframe including the CCA interval, the common DCI (CRC is masked through the CC-RNTI By receiving the relevant information included in the), it is possible to identify a specific uplink subframe including the CCA interval.
  • the related information may include at least one of whether CCA is configured, a CCA method (eg, random backoff or a single CCA slot), a CCA configuration symbol length, a random backoff value, and a collision window size value.
  • the UE When the CCA interval is configured, the UE does not configure a physical uplink shared channel (PUSCH) or a physical uplink control channel (PUCCH) in a resource element (RE) of time domain symbol (s) belonging to the CCA interval.
  • PUSCH physical uplink shared channel
  • PUCCH physical uplink control channel
  • the UE checks the CCA configuration length as follows. For example, the UE can immediately determine the CCA configuration length through the number of CCA configuration symbols (eg, the number of time domain symbols constituting the CCA interval) included in the DCI.
  • the CCA symbol means a time domain symbol that can be used for CCA.
  • the UE may check the number of CCA configuration symbols required according to the random backoff value included in the DCI.
  • the terminal may check the number of CCA configuration symbols required according to the collision window size value included in the DCI.
  • all UEs may know in advance that the CCA interval is the first (or last) at least one time domain symbol of the time domain symbols of the subframe.
  • the number of CCA configuration symbols or CCA configuration symbol positions may be delivered to the UE by an RRC message of an upper layer.
  • the UE may include an uplink subframe after the first uplink subframe among the uplink subframes. It may be expected that no CCA interval is configured.
  • the UE may rate match information to be transmitted to the remaining REs except for the RE corresponding to the time domain symbol configured for CCA and transmit the rate matching information.
  • 7A, 7B, 7C, and 7D are diagrams illustrating a CCA configuration of an uplink transmission burst.
  • FIG. 7A and 7B illustrate a case in which a CCA section is configured behind a subframe.
  • FIG. 7A illustrates a case in which CCA intervals are configured in all M uplink subframes included in the uplink transmission burst
  • FIG. 7B includes the uplink transmission burst.
  • a case in which a CCA interval is configured only in a second subframe and a fourth subframe among M (eg, four) uplink subframes is illustrated.
  • FIG. 7C and 7D illustrate a case in which a CCA section is configured in front of a subframe.
  • FIG. 7C illustrates a case in which CCA intervals are configured in all M uplink subframes included in the uplink transmission burst
  • FIG. 7D includes the uplink transmission burst.
  • a case in which a CCA interval is configured only in a first subframe and a third subframe among M uplink subframes (eg, four) is illustrated.
  • the information on the above-described CCA symbol configuration may be known to the terminal dynamically.
  • a base station transmits information indicating a position of a time domain symbol at which uplink transmission is started among a plurality of time domain symbols included in a subframe (hereinafter, referred to as 'first position information') to a terminal, so that CCA can be performed.
  • the UE may inform whether the symbol (or CCA interval) is configured (set) in front of the subframe (eg, the first time slot of the subframe). For example, the base station allows the terminal to start uplink transmission from the first time domain symbol (eg time domain symbol 0) or uplink transmission from the second time domain symbol (eg time domain symbol 1).
  • time domain symbol 0 is used for CCA. That is, when the CCA interval is not set in the front (eg, the first time slot) of the subframe, the first position information generated by the base station is present in front of the plurality of time domain symbols included in the subframe. It may represent a time domain symbol (eg, time domain symbol 0). If the CCA interval is set in front of the subframe (eg, the first time slot), the first position information is the earliest time domain symbol (eg, time domain symbol) among a plurality of time domain symbols included in the subframe. A time domain symbol (for example, time domain symbol 1) different from the number 0 may be represented.
  • time domain symbol for example, time domain symbol 1
  • the base station transmits information indicating a position of a time domain symbol at which uplink transmission is terminated among a plurality of time domain symbols included in a subframe (hereinafter referred to as 'second position information') to the terminal, so that CCA can be performed.
  • the UE may be informed whether the symbol (or CCA interval) is configured (set) at the back of the subframe (eg, the second time slot of the subframe).
  • the base station allows the user equipment to perform uplink transmission to the last time domain symbol (eg, time domain symbol 13) or uplink transmission only to the second time domain symbol (eg, time domain symbol 12) from the end. (In this case, time domain symbol 13 is used for CCA).
  • the second position information generated by the base station is the last of the plurality of time domain symbols included in the subframe. It may represent a time domain symbol (eg, time domain symbol 13). If the CCA interval is set in the back of the subframe (eg, the second time slot), the second position information is the last time domain symbol (eg, time domain symbol) among the plurality of time domain symbols included in the subframe. 13 may be different from a time domain symbol (eg, time domain symbol 12).
  • the base station may signal the number of time domain symbols for uplink transmission to the UE and inform whether the time domain symbols (or CCA intervals) in which CCA can be performed are located behind the subframe. For example, the base station may signal the terminal with 13 or 12 number of time domain symbols that the terminal can use for uplink transmission, thereby notifying the terminal of CCA symbol configuration information behind the subframe.
  • the UE together with CCA symbol configuration information for the front of the subframe eg, information on a time domain symbol located in front of the subframe and can be used for CCA
  • CCA symbol configuration information for the back of the subframe eg, the subframe.
  • the information on the time domain symbol which is located at the back and can be used for CCA may be checked to determine CCA symbol configuration information of the corresponding subframe.
  • the above-described CCA symbol configuration information (or information on time domain symbols constituting the CCA interval) (eg, the number or location of CCA symbols) may be included in a UE-specific DCI.
  • the base station may inform the UE of CCA symbol configuration information for a plurality of uplink subframes through the unlicensed band common DCI.
  • the base station may transmit the first location information and the second location information to the terminal through a UE-specific DCI or a common DCI.
  • the UE Since the UE must demodulate the common DCI of the unlicensed band cell, regardless of whether the uplink grant is cross carrier scheduling in the licensed band or the uplink grant is self-scheduling in the unlicensed band, the UE Can check the CCA symbol configuration information. For example, the base station may signal CCA configuration information for M subframes of an unlicensed band cell to the terminal.
  • Common DCI information may not be carried in every downlink subframe. In this case, the terminal can expect that the above common DCI information is valid.
  • the CCA symbol configuration information may be updated with information included in the newly received common DCI.
  • the CCA symbol configuration information eg, CCA symbol configuration information for the (n + 6) th subframe
  • the CCA symbol configuration information eg, CCA symbol configuration information for the (n + 6) th subframe included in the common DCI of the nth downlink subframe and the (n + 1) th downlink subframe.
  • the CCA symbol configuration information eg, CCA symbol configuration information for the (n + 6) th
  • the UE may follow common DCI information of the (n + 1) th subframe. .
  • FIG 8 illustrates a method of signaling CCA symbol configuration information through a common DCI according to an embodiment of the present invention.
  • FIG. 8 illustrates a case in which the base station informs the UE of CCA symbol configuration information for M (eg, 6) uplink subframes through a common DCI.
  • One of the two tuple bits represents CCA symbol configuration information (eg, 0: start transmission at time domain symbol 0, 1: start transmission at time domain symbol 1) for the front of the subframe, and the rest of the tuple bits.
  • One bit may indicate CCA symbol configuration information (for example, 0: transmit up to time domain symbol 13, and 1: transmit up to 12 time domain symbol) for a subframe. That is, the bit pair indicating the CCA interval for one subframe may include one bit for the first position information and one bit for the second position information.
  • the base station uses six common uplink subframes (eg, (n + 4) th through (n +) after a predetermined time from the nth subframe through the common DCI of the nth subframe (downlink subframe). 9) the CCA symbol configuration information for the subframe) can be informed to the UE. 8 illustrates a case in which the predetermined time corresponds to four subframes (for example, 4 ms).
  • the CCA symbol configuration information transmitted to the UE may include a bit pair (or tuple bits) indicating a CCA interval for each uplink subframe (eg, (n + 4) th to (n + 9) th subframes). have. As illustrated in FIG.
  • time domain symbol 0 of the (n + 4) th subframe may be used for CCA.
  • (tuple bits 10)
  • time domain symbols 0 and 13 of (n + 6) th subframe are used for CCA
  • FIG. 9 is a diagram illustrating a method of updating CCA symbol configuration information through a common DCI according to an embodiment of the present invention.
  • FIG. 9 includes the common DCI of the nth downlink subframe (eg, the first time point) and the common DCI of the (n + 1) th downlink subframe (eg, the second time point after the first time point).
  • the CCA symbol configuration information is changed, a case in which the CCA configuration of the (n + 7) th subframe is changed is illustrated.
  • the base station uses six common uplink subframes (eg, (n + 4) th to (n + 9) after a predetermined time from the nth downlink subframe through the common DCI of the nth downlink subframe).
  • CCA symbol configuration information for the first subframe can be informed to the UE.
  • 9 illustrates a case where the predetermined time corresponds to four subframes (for example, 4 ms).
  • the base station when the CCA interval for the (n + 7) th subframe is changed, the base station changes the value of a bit pair (or tuple bits) indicating the CCA interval of the (n + 7) th subframe, CCA symbol configuration information (eg, [10 01 11 11 10 01]) including the changed bit pair may be transmitted to the UE in the (n + 1) -th downlink subframe.
  • CCA symbol configuration information eg, [10 01 11 11 10 01]
  • a CCA symbol when a CCA symbol is configured in front of a subframe and signal transmission starts from a second time domain symbol (eg, time domain symbol 1) of the subframe, the UE determines a first time domain symbol (eg, according to the LBT result).
  • the signal may be transmitted at any sample position within the interval of time domain symbol 0).
  • the signal transmitted in the interval of the first time domain symbol (eg, time domain symbol 0) may be an arbitrary signal for channel occupancy, and the terminal is the original first time domain symbol (eg, time domain symbol 0).
  • the last time domain symbol (eg, SC-FDMA symbol) of the LTE uplink subframe may be composed of a sounding reference signal (SRS).
  • SRS sounding reference signal
  • the SRS may be configured immediately after the first CCA period or just before the last CCA period. The case in which the SRS is included in the above-described embodiment of FIGS. 7A and 7C will be described in detail with reference to FIGS. 10A and 10B.
  • 10A and 10B illustrate an SRS configuration position according to a CCA section according to an embodiment of the present invention.
  • a CCA interval is configured in all M uplink subframes (eg, four) included in an uplink transmission burst (CCA interval is configured behind a subframe) and SRS is configured before the CCA interval. The case is illustrated.
  • FIG. 10B illustrates a case in which a CCA interval is configured in all M uplink subframes included in an uplink transmission burst (CCA interval is configured in front of a subframe) and SRS is configured after the CCA interval. Is illustrated.
  • the existing SRS transmission location may be configured as a section for channel state measurement (CCA).
  • CCA channel state measurement
  • the SRS (or SRS interval) is configured as a CCA interval
  • the PUCCH of the subframe including the CCA interval may be transmitted in a shortened PUCCH structure, and the SRS is not transmitted in the corresponding CCA interval.
  • Shortened PUCCH means PUCCH having a shorter length than conventional PUCCH.
  • the CCA period may be used for the CCA use of the terminal allocated to the next uplink subframe.
  • One or more subframes including the CCA interval may be included in an uplink transmission burst.
  • CCA and SRS transmission may be performed during a period of the last time domain symbol (eg, SC-FDMA symbol) in a subframe.
  • the SRS in this case has a shorter length than the existing SRS, hereinafter referred to as a 'Shortened SRS'.
  • the shortened SRS may not be an SRS composed of two RE intervals but an SRS composed of two or more RE intervals. For example, if the SRS is configured in four RE intervals, a repetition pattern appears during time domain symbols (eg, SC-FDMA symbols) in the time domain (or time domain), and the Shortened SRS is one of four repetition patterns. Only one, two, or three repeating patterns can be transmitted. The remaining interval (eg, remaining repetition pattern) may be used for CCA.
  • One or more subframes including the CCA period and Shortened SRS may be included in an uplink transmission burst.
  • the uplink transmission burst may include an SRS symbol set composed of one or more time domain symbols (eg, SC-FDMA symbols). That is, the SRS symbol set includes at least one time domain symbol for SRS transmission.
  • SRS symbol set composed of one or more time domain symbols (eg, SC-FDMA symbols). That is, the SRS symbol set includes at least one time domain symbol for SRS transmission.
  • the SRS symbol set may be configured (positioned) in front of the uplink subframe set as an uplink pilot time slot (UpPTS) of frame structure type 2 (FST-2).
  • the SRS symbol set may consist of a plurality of time domain symbols (eg, SC-FDMA symbols) (starting from the start of the subframe) and may be configured at the end of the uplink subframe set.
  • the SRS symbol set may be configured (positioned) in the second time slot of the subframe.
  • a physical random access channel may be included in front of an uplink transmission burst.
  • the PRACH may be configured independently of the SRS or simultaneously configured with the SRS through multiplexing of frequency domain resources (or frequency domain resources).
  • the channel occupancy signal may be included in front of the uplink transmission burst. Referring to Figures 11a and 11b, the unlicensed band uplink transmission burst will be described.
  • 11A and 11B are diagrams illustrating an unlicensed band uplink transmission burst according to an embodiment of the present invention.
  • FIG. 11A illustrates an example in which an SRS symbol set is configured at the front and the rear of an uplink transmission burst.
  • the SRS symbol set included in the front of the uplink transmission burst may include L time domain symbols (eg, SC-FDMA symbols) among the time domain symbols of the nth subframe.
  • the SRS symbol set included behind the uplink transmission burst may have the same length as the second time slot of the subframe.
  • a PUSCH may be configured in a first time slot of a (n + 5) th subframe and an SRS symbol set may be configured in a second time slot.
  • 11A includes M (eg, 4) uplink subframes (eg, (n + 1) th to (n + 4) th subframes), and M uplinks At least one of the subframes (eg, the (n + 2) th subframe) may include a CCA interval instead of the SRS interval.
  • L time domain symbols (eg, SC-FDMA symbols) in which PRACH and SRS are multiplexed may be configured (included) in front of the uplink transmission burst illustrated in FIG. 11B. That is, multiplexed PRACH and SRS may be configured (included) in L time domain symbols among the time domain symbols of the nth subframe.
  • the SRS symbol set included behind the uplink transmission burst illustrated in FIG. 11B may include N time domain symbols (eg, SC-FDMA symbols) among time domain symbols of the (n + 5) th subframe. have.
  • 11B includes M uplink subframes (eg, (n + 1) th to (n + 4) th subframes), and M uplinks.
  • At least one of the subframes (eg, the (n + 2) th subframe) may include a CCA section and a shortened SRS section instead of the SRS section.
  • the downlink transmission burst and the uplink transmission burst may be continuously transmitted.
  • the downlink transmission burst and the uplink transmission burst transmitted continuously are referred to as an 'unlicensed transmission burst'.
  • a section in which there is no signal transmission for a predetermined interval (hereinafter, 'non-transmission section No_Tx') may be included.
  • the last downlink subframe included in the downlink transmission burst is referred to as a 'switch subframe'. This is called.
  • the CCA may be performed by the terminal according to the defined channel access procedure.
  • a switching subframe will be described with reference to FIGS. 12A, 12B, and 12C.
  • 12A, 12B, and 12C are diagrams illustrating switching subframes included in an unlicensed transmission burst according to an embodiment of the present invention.
  • FIGS. 12A, 12B, and 12C illustrate a set of signals included in the downlink transmission burst and the uplink transmission burst defined above.
  • a switching subframe may be configured by different sets of signals included in the downlink transmission burst and the uplink transmission burst.
  • the switching subframe may include a downlink partial subframe having a DwPTS length, a channel occupancy signal, a non-transmission period (No_Tx), and an SRS symbol set.
  • the SRS symbol set may include N time domain symbols among time domain symbols of a transition subframe.
  • the switching subframe may include a downlink partial subframe having a DwPTS length, a non-transmission period (No_Tx), and a PRACH symbol set.
  • the PRACH symbol set may include at least one time domain symbol for PRACH transmission.
  • the switching subframe may include a downlink partial subframe having a DwPTS length, a channel occupancy signal, and a non-transmission period (No_Tx).
  • the channel state In the unlicensed band, the channel state must be checked first according to the channel access procedure before the communication node transmits the burst.
  • the downlink channel access procedure may include a channel access procedure for the downlink transmission burst.
  • different parameter values are defined according to the classification of traffic to be transmitted by the communication node.
  • Table 4 below shows channel access priority classes according to four classes (Voice, Video, Best effort (BE), and BK (background)) of traffic that a communication node intends to transmit. The smaller the value of the channel access priority class, the higher the priority. According to the value of the channel access priority class, the contention window size (CWS) and the maximum occupancy time (Max. COT) are defined differently.
  • CWS contention window size
  • Max. COT maximum occupancy time
  • channel slot method for wireless LAN and LAA (category 4) waits for a certain time from the moment when the signal occupying the channel disappears, and when the randomly selected count value among the CWS sizes becomes 0, transmission is performed.
  • the predetermined time may be composed of a fixed time of 16us and K slot slots (one slot has a length of 9us).
  • COT 1 (Voice) One ⁇ 3, 7 ⁇ 2 ms 2 (Video) One ⁇ 7, 15 ⁇ 3 ms 3 (BE) 3 ⁇ 15, 31, 63 ⁇ 10ms or 8ms 4 (BK) 7 ⁇ 15, 31, 63, 127, 255, 511, 1023 ⁇ 10ms or 8ms
  • Claim 1 CCA CCA method is to perform the number of fixed-length (such as, 16us) and CCA slot in the K slot during a predetermined period of time (T).
  • the second CCA method is to perform CCA for a time including a randomly selected number of CCA slots among positive integers smaller than the collision window size N slot and greater than zero.
  • TxOP transmission opportunity
  • the first UL method is for a communication node to transmit a subframe composed of an uplink signal (or channel) at a scheduled time point without checking channel occupancy status.
  • the second UL method is for the communication node to check the channel occupancy state for a fixed length and transmit a subframe consisting of an uplink signal (or channel) if the channel is not occupied.
  • the third UL method is for the communication node to check a channel occupancy state during a randomly selected CCA slot length and transmit a subframe composed of an uplink signal (or channel) when the channel is not occupied.
  • the first UL method may be used for the next transmission.
  • an uplink transmission burst transmitted after a downlink transmission burst (No_Tx) of a predetermined length after a downlink transmission burst may be performed at the scheduled time without checking the channel state.
  • the maximum time that can be continuously transmitted is defined in one TxOP interval, and the transmission of an uplink transmission burst transmitted after a non-transmission interval No_Tx of a predetermined length after the maximum continuous transmission time may be performed. Can be performed at a scheduled time without.
  • transmission of uplink subframes transmitted after the first subframe of the uplink transmission burst during one TxOP period may be performed at a scheduled time point without checking the channel state.
  • the first subframe may be an uplink subframe including a PUSCH or a subframe including a PRACH symbol set or an SRS symbol set having a length of 1 ms or less.
  • the first subframe may be transmitted by the terminal after the channel occupancy state is confirmed immediately before transmission, according to a transmission condition.
  • a UE that is scheduled (or assigned) a subframe after the first subframe may not be scheduled for the first subframe.
  • the communication node does not check the channel occupancy state immediately before transmitting the subframes after the first subframe, but a non-transmission interval No_Tx of a predetermined length may be configured. That is, the specific terminal may not be scheduled for the first subframe among the uplink bursts scheduled by the base station to the plurality of terminals.
  • the base station may configure a non-transmission interval No_Tx of a predetermined length between the subframes for the terminals that do not include the first subframe (the channel access status check is performed) in the scheduled subframe.
  • the length of the non-transmission interval No_Tx may be 9us, 16us, 25us, 34us, or hundreds of us.
  • the UE may confirm that the scheduled subframe is not the first subframe of the uplink transmission burst through a DCI message in (e) PDCCH scheduling the corresponding subframe.
  • the first subframe and subsequent subframes may be divided into 1 bit.
  • a terminal that checks the channel occupancy state at least once during one TxOP period may perform uplink transmission or SRS transmission of a discontinuously scheduled subframe without confirming the channel occupancy state immediately before the transmission. Can be.
  • the last predetermined period in the previous subframe of the subframe scheduled to the terminal may be configured as a non-transmission period (No_Tx) for the terminal initially scheduled for the TxOP.
  • No_Tx non-transmission period
  • the terminal may not need to further check the channel occupancy state.
  • a communication node eg, a terminal
  • the communication node may check the channel occupancy state immediately before the first SRS transmission.
  • the UE may perform the SRS transmission without checking the channel occupation status.
  • uplink transmission including only the SRS symbol set without including the PUSCH may be performed at a scheduled time without checking the channel state.
  • the communication node eg, the terminal
  • the length of the non-transmission period (No_Tx) may be 9us, 16us, 25us, 34us, or hundreds of us.
  • transmission of an uplink subframe including only the PUCCH and not including the PUSCH may be performed at the scheduled time without checking the channel state.
  • the communication node eg, the terminal
  • the length of the non-transmission period (No_Tx) may be 9us, 16us, 25us, 34us, or hundreds of us.
  • uplink transmission including only the PRACH without including the PUSCH may be performed at the scheduled time without checking the channel state.
  • the communication node eg, the terminal
  • the length of the non-transmission period (No_Tx) may be 9us, 16us, 25us, 34us, or hundreds of us.
  • the second UL method may be used for the next transmission.
  • the communication node may check the channel state for a predetermined time before transmitting the first SRS or PRACH in the switching subframe after the downlink transmission burst during one TxOP period.
  • the communication node may check the channel state for a predetermined time before transmitting the first uplink subframe (including the PUSCH) after the downlink transmission burst.
  • the predetermined time for checking the channel state may be a time configured by a predetermined time and a CCA slot.
  • the predetermined time for checking the channel status may be 9us, 16us, 25us, 34us, or hundreds of us.
  • the communication node may check the channel state for a predetermined time immediately before transmitting the SRS.
  • the predetermined time for checking the channel state may be a time configured by a predetermined time and a CCA slot.
  • the predetermined time for checking the channel status may be 9us, 16us, 25us, 34us, or hundreds of us.
  • the communication node may check the channel state for a predetermined time immediately before transmitting the PRACH.
  • the predetermined time for checking the channel state may be a time configured by a predetermined time and a CCA slot.
  • the predetermined time for checking the channel status may be 9us, 16us, 25us, 34us, or hundreds of us.
  • the third UL method may be used for the next transmission.
  • a third UL method may be applied to transmission of a subframe including the first SRS, PRACH, or PUSCH.
  • a third UL method may be applied to SRS transmission temporally multiplexed with a PUSCH in one subframe.
  • a third UL method may be applied to a PRACH transmission temporally multiplexed with a PUSCH in one subframe.
  • a third UL method may be applied to transmission of an uplink subframe corresponding to DCI of (e) PDCCH including information for uplink random channel access.
  • a carrier indicator field (CIF) of DCI format 0 or DCI format 4 / 4A indicates an unlicensed band cell
  • the number of slots for random backoff may be included in the DCI message.
  • a third UL method may be applied to transmission of an uplink subframe scheduled in a cross carrier.
  • the terminal may start checking the channel occupancy state so that the random backoff may be terminated at the transmission time of the scheduled subframe. That is, regardless of the slot value for random backoff, the uplink transmission time point is the same as the uplink transmission time point for other cells in the same cell group.
  • the time required for checking the channel occupancy state may not exceed the length of one time domain symbol (eg, SC-FDMA symbol), in which case the TxOP may be 1 ms.
  • the time required for checking the channel occupancy state may consist of random backoff only, or may consist of a fixed time and random backoff.
  • a collision window value for random backoff may be included in the DCI message.
  • the collision window value may be changed according to the reception success result of the previous uplink transmission burst.
  • the collision window value included in the DCI message may be a bit string corresponding to a collision window set defined by a higher layer or a collision window set already defined in a standard. For example, when the collision window set is ⁇ 3, 5, 7 ⁇ , the collision window value included in the DCI message may be configured as ⁇ 01, 10, 11 ⁇ . For another example, when the collision window set is ⁇ 3, 5, 6, 7 ⁇ , the collision window value included in the DCI message may be configured as ⁇ 00, 01, 10, 11 ⁇ . Alternatively, the actual collision window value may be included in the DCI message.
  • the number of slots for random backoff may be included in the DCI message. This may be used to allow all terminals scheduled for the same uplink subframe to perform the same backoff.
  • the collision window set is ⁇ 3, 5, 7 ⁇
  • the collision window value included in the DCI message may be configured as ⁇ 01, 10, 11 ⁇ , and '00' indicates a collision window value to the terminal. Instead, it can be defined as passing a random backoff value.
  • the collision window field received by the terminal is '00', the terminal may expect to include a random backoff value in the next field.
  • the terminal may start checking the channel occupancy state so that the random backoff may be terminated at the transmission start time of the scheduled uplink transmission burst. That is, regardless of the slot value for random backoff, the uplink transmission time point may be the same as the uplink transmission time point for other cells of the same cell group.
  • the time required for checking the channel occupancy state may consist of only random backoff or a fixed time and random backoff.
  • the random backoff value is selected within the collision window, and the collision window value may be changed according to the reception success result of the previous uplink transmission burst.
  • the UE may determine the number of slots for random backoff from the collision window value included in the DCI or the actual number of random backoff slots.
  • a collision window value or an actual random backoff value for random backoff selection is added to the DCI message. May be included.
  • the collision window value included in the DCI message may be a bit string corresponding to the collision window set defined by the higher layer or the collision window set already defined in the standard. For example, when the collision window set is ⁇ 3, 5, 7 ⁇ , the collision window value included in the DCI message may be configured as ⁇ 01, 10, 11 ⁇ . For another example, when the collision window set is ⁇ 3, 5, 6, 7 ⁇ , the collision window value included in the DCI message may be configured as ⁇ 00, 01, 10, 11 ⁇ .
  • the collision window value and the actual random backoff value may be configured at the same time.
  • the collision window value included in the DCI message may be configured as ⁇ 01, 10, 11 ⁇ , and '00' indicates a collision window value to the terminal. Instead, it can be defined as passing a random backoff value.
  • the collision window field received by the terminal is '00', the terminal may expect to include a random backoff value in the next field.
  • scheduling for a subframe including a PUSCH may be scheduled by downlink of a same cell or by cross-carrier scheduling by another cell in a cell group. Can be.
  • self-carrier scheduling it may be required to confirm whether a communication node (eg, terminal) should perform confirmation of channel occupancy status immediately before transmitting the corresponding subframe.
  • dynamic scheduling for SRS transmission resources may be required.
  • scheduling information may be included in the DCI transmitted through the downlink PDCCH common search space.
  • At least one of the following information (eg, first information, second information, third information, fourth information, fifth information, sixth information) to DCI transmitted through the downlink PDCCH common search space of the unlicensed band May be included.
  • the corresponding subframe below refers to the (n + k) th subframe based on the nth downlink subframe in which the DCI including at least one of the following information (eg, first information to sixth information) is transmitted. It means a frame (or the position of the (n + k) th subframe). For example, k may be four.
  • the first information is information indicating whether the first subframe of the uplink transmission burst is configured in the corresponding subframe.
  • the second information is information indicating whether confirmation of the channel occupation status is performed immediately before the uplink subframe to be transmitted in the corresponding subframe.
  • the third information is information indicating whether the SRS symbol set is included in the corresponding subframe.
  • the fourth information is information indicating whether or not the last time domain symbol (eg, SC-FDMA symbol) of the corresponding subframe is configured for SRS transmission.
  • the fifth information is information indicating whether or not the last time domain symbol (eg, SC-FDMA symbol) of the corresponding subframe is configured for confirmation of the channel occupation state.
  • Sixth information is information for triggering SRS transmission in a corresponding subframe.
  • one downlink subframe may schedule several uplink subframes.
  • DCI for delivering scheduling information may be configured through the following method (eg, method M10, method M20, method M30).
  • DCI information for at least one of the following methods eg, methods M10 to M30 may be included in one downlink subframe and transmitted.
  • Method M10 is a method in which a base station provides scheduling information for different uplink subframes through two or more different DCIs using one downlink subframe, respectively.
  • the scheduling information may include the position of the first uplink subframe that can be occupied. That is, the position of the first uplink subframe (eg, X in (n + 4 + X)) that can be occupied based on the nth (where n is a natural number) downlink subframe including DCI is included in the scheduling information. May be included.
  • Method M20 is a method in which a base station provides scheduling information for two or more different uplink subframes through one DCI using one downlink subframe.
  • the scheduling information may include the number of consecutive subframes including the (n + 4 + X) th subframes based on the nth downlink subframe including the DCI.
  • the method M30 is a method for providing, by the base station, scheduling information specified through a predetermined bit length included in the DCI, for one or more scheduling information defined by an upper layer message or an RRC message.
  • information on a subframe location may be additionally included in existing DCI formats for granting an uplink subframe.
  • the information about the subframe location may be included in scheduling information (scheduling information for different uplink subframes) provided through two or more different DCIs transmitted in one downlink subframe.
  • the DCI message (DCI message related to uplink scheduling) included in the nth subframe in the LTE system is valid for the (n + 4) th uplink subframe.
  • An uplink subframe is defined according to a downlink position in which DCI is included in a frame configuration (frame configuration of uplink and downlink) for TDD of LTE.
  • an UL index field may be included in the DCI of the downlink subframe. The uplink index field is used to distinguish when uplink is configured in two subframes having different positions through one downlink subframe.
  • the position of the uplink subframe according to the value of the uplink index field may be predefined.
  • the information configuration method for the method M10 is to configure two or more bits in the uplink index field.
  • the uplink index field may designate a (n + 4 + X) th subframe based on the nth downlink subframe including the DCI.
  • X is a positive integer including 0 and may be defined according to the value of the uplink index field.
  • the base station includes information (eg, a value of the 'UL Index field') indicating the scheduled uplink subframe (eg, the (n + 4 + X 1 ) th subframe) in the first DCI, and the scheduled uplink subframe Information representing a frame (e.g., the (n + 4 + X 2 ) th subframe, where X 1 ⁇ X 2 ) (e.g., the value of the 'UL Index field') is assigned to the second DCI (different from the first DCI). And the first DCI and the second DCI may be transmitted in the downlink subframe (eg, the nth subframe).
  • information eg, a value of the 'UL Index field'
  • the scheduled uplink subframe Information representing a frame (e.g., the (n + 4 + X 2 ) th subframe, where X 1 ⁇ X 2 ) (e.g., the value of the 'UL Index field') is assigned to the second DCI (different from the
  • the 'UL Index' field may be configured with 3 bits (eg, a value of 0 to 7), as shown in Table 5 below, in consideration of the maximum channel occupancy time (Maximum COT) of the unlicensed band.
  • the value of the 'UL Index' field is 1, the start of a downlink subframe (eg, nth subframe) in which DCI is transmitted and an uplink subframe (eg, (n + 4 + 1) th subframe) are scheduled.
  • the interval between the beginning of the frame) corresponds to (4 + 1) subframes.
  • Another method of configuring information for method M10 is flexible timing information on the position of a scheduled (n + 4 + X) -th uplink subframe, in which the base station directly defines an X value (eg, seconds). It is.
  • An X value may be included in the DCI for each uplink scheduling.
  • multiple uplink subframes of a predetermined subframe length may be configured to be continuous or may be configured without gaps.
  • a method of configuring DCI information for continuous multiple uplink subframe scheduling is to specify the number of consecutive subframes.
  • the number of consecutive subframes may be included in scheduling information (scheduling information for two or more different uplink subframes) provided through one DCI.
  • the first starting subframe may be the (n + 4) th subframe based on the nth downlink subframe including the DCI or a value newly defined in the DCI.
  • the number of consecutively configured (or scheduled) subframes may be newly defined in the DCI. For example, when 3 bits are used for DCI, the number of consecutive multiple uplink subframes including the (n + 4) th subframe after the nth subframe in which the DCI is received is' multi sub According to the value of the 'frame number' field, it may be defined as shown in Table 6.
  • the above-described DCI formats for the method M10 and the method M20 may be simultaneously configured in one downlink subframe.
  • the value of the 'number of subframes' field and the value of the 'UL Index' field may be included in the DCI at the same time. That is, the base station may include information indicating the number of consecutively scheduled subframes and information indicating the position of the first uplink subframe that can be occupied in the same DCI. For example, when the value of the 'number of subframes' field is a predetermined value, the position of the uplink subframe may be designated through the 'UL Index' field included in the DCI.
  • the 'Multiple Subframes' field is not the contiguous multiple subframes, but the subframe position specified by the value of the 'UL Index' field. It can be understood as uplink scheduling information for.
  • the value of the 'multiple subframe number' field may mean the number of consecutive multiple subframes including the (n + 4) th subframe. have. In this case, the 'UL Index' field may not be included in the DCI.
  • Table 7 shows a case in which a 3-bit length 'multiple subframe number' field and a 3-bit length 'UL Index' field are configured together in the DCI.
  • Table 7 when the value of the 'number of multiple subframes' field is 1 or more, the number of consecutive uplink subframes configured in addition to the (n + 4) th subframe may be considered. If the value of the 'Multiple Subframes' field is 0, rather than consecutive multiple subframes, the 'Multiple Subframes' field is assigned to the subframe specified by the value of the 'UL Index' field included in the same DCI. It means DCI information about the scheduling of the configured uplink.
  • the position of the scheduled uplink subframe may be determined based on the value of the 'UL Index' field. If the value of the 'Number of Multiple Subframes' field is different from a predetermined value (eg 0), the position of the first uplink subframe among the plurality of uplink subframes scheduled is irrelevant to the value of the 'UL Index' field. May be determined (eg, the (n + 4) th subframe).
  • the value of the 'multi index number' field and the value of the 'UL Index' field are included in the DCI at the same time
  • the value of the 'UL Index' field is an arbitrary value
  • the number of 'multi subframes' is specified.
  • the value of the field ' may be referenced. For example, when the value of the 'UL Index' field is 0, which is a predetermined random value, the base station does not schedule only the subframe position defined by the 'UL Index' as an uplink, but is included in the same DCI. According to the value of the 'number of multiple subframes' field, consecutive multiple subframes may be scheduled as uplink.
  • Table 8 shows a case where a 3-bit 'UL Index' field and a 3-bit 'multiple subframe number' field are configured together in one DCI.
  • the value of the 'UL Index' field when the value of the 'UL Index' field is 1 or more, the value of the 'UL Index' field may mean an X value at (n + 3 + X).
  • the value of (n + 3 + X) means the position of the (n + 3 + X) th subframe (uplink subframe) scheduled through the DCI information included in the nth subframe.
  • uplink resources for consecutive multiple subframes may be scheduled according to the value of the 'number of subframes' field included in the same DCI. . That is, when the value of the 'UL Index' field is a predetermined value (eg, 0), the number of uplink subframes that are continuously scheduled may be determined based on the value of the 'number of multiple subframes' field. At this time, the position of the first uplink subframe scheduled may be determined regardless of the value of the 'UL Index' field (eg, (n + 4) th subframe). If the value of the 'UL Index' field is different from a predetermined value (eg, 0), the number of uplink subframes that are continuously scheduled may be determined to be 1 regardless of the value of the 'multiple subframe number' field. .
  • a predetermined value eg, 0
  • method M30 relates to configuration information for one or more scheduling information (eg, multiple subframe locations, etc.) defined by an RRC message or an upper layer message, and corresponds to an actual configuration indication by a trigger field included in DCI. It is about.
  • the higher layer message or the RRC message may include uplink multiple subframe location information, which may be configured as described above.
  • Such location information may be a criterion for including the 'uplink multiple subframe trigger' field in the DCI in the downlink subframe of the base station.
  • each terminal may receive one or more uplink multiple subframe location information from the base station through an RRC message or an upper layer message.
  • Each such configuration information may be mapped to information of a predetermined bit length.
  • the DCI includes a field for triggering the uplink multiple subframe location information (or configuration information) (that is, an uplink multiple subframe trigger field), and a value of the uplink multiple subframe trigger field is determined by the mapping.
  • the information may be the same as the information (eg, information of a predetermined bit length).
  • Each terminal may configure an uplink multiple subframe according to a value of the 'uplink multiple subframe trigger' field included in the DCI.
  • a communication node may transmit uplink through a multiple scheduling method.
  • the communication node performs scheduling in two steps.
  • a communication node eg, a base station
  • an uplink including information necessary for uplink transmission eg, location and number of RBs, HARQ-related information, LBT parameters, subframe location information, etc.
  • UL grant link grant
  • a communication node eg, a base station
  • the communication node schedules at least one uplink subframe.
  • the subframe index actually transmitted by the communication node may be fixed as the subframe index in the licensed band or may be a virtual subframe index configured after the secondary scheduling step.
  • the UE may receive the secondary scheduling information for the secondary scheduling step through the common DCI of the PHICH or unlicensed band cell.
  • the secondary scheduling information may be defined as a sequence of PHICHs or transmitted through a common DCI of an unlicensed band cell.
  • the UE may change the LBT scheme or may start an uplink subframe based on the secondary scheduling time point.
  • the multiple scheduling method will be described with reference to FIG. 13.
  • FIG. 13 is a diagram illustrating a multiple uplink scheduling method according to an embodiment of the present invention.
  • the communication node eg, the base station performs the (n + 5) th, (n + 6) th, and (n + 7) th uplink sub through the uplink grant DCI in the first scheduling step.
  • the case of scheduling a frame is illustrated.
  • the base station transmits at least one uplink subframe (eg, (n + 5) th to (n + 7) th subframes) to the UE in the primary downlink subframe (eg, the nth subframe).
  • the primary scheduling information for scheduling the may be transmitted.
  • the terminal may configure the uplink from the defined time point.
  • the defined time point is a subframe (eg, (k + 1) th subframe or (k + 1) th subframe away from the kth subframe (eg, (n + 4) th subframe), which is a secondary downlink subframe, or (k +2) th subframe).
  • the defined view point may be the (n + 5) th subframe in FIG. 13.
  • a base station transmits an uplink signal to a user equipment in a second downlink subframe (eg, (n + 4) th subframe) separated by a predetermined time from a first downlink subframe (eg, an nth subframe). Secondary scheduling information for determining the may be transmitted.
  • the UE corresponds to an uplink subframe corresponding to a transmission time determined by the second scheduling information among uplink subframes (eg, (n + 5) th to (n + 7) th subframes) scheduled by the primary scheduling information.
  • an uplink signal may be transmitted.
  • the uplink transmission granted in the primary scheduling step is performed in a specific subframe (eg, (k + 1) th subframe or (k + 2) th subframe).
  • the terminal receiving the secondary scheduling information of the secondary scheduling step instead of the LBT of the category 4 You can change the LBT method by performing a single LBT of 25us. For example, the terminal receiving the secondary scheduling information checks the occupied state of the unlicensed band channel for 25us time before transmitting the uplink signal, and when the occupied state of the unlicensed band channel is unoccupied, The uplink signal may be transmitted.
  • the PHICH sequence may have its sequence value determined according to the primary scheduling information (eg, uplink grant subframe index information) of the primary scheduling step. Therefore, when the terminal detects the PHICH sequence (PHICH sequence for the secondary scheduling step) received in the kth subframe (eg, (n + 4) th subframe), the primary scheduling information of the primary scheduling step Is expected to be valid, and can be transmitted from a specific subframe (eg, (k + 1) th subframe or (k + 2) th subframe).
  • the primary scheduling information of the primary scheduling step Is expected to be valid, and can be transmitted from a specific subframe (eg, (k + 1) th subframe or (k + 2) th subframe).
  • the UE may check scheduling validity of the secondary scheduling step. For example, in the method using the toggle concept, when the bit defined as 1 in the primary scheduling step is changed to 0 in the kth subframe (eg, (n + 4) th subframe), the UE is secondary The scheduling of the scheduling step may be confirmed to be valid, and the uplink may be transmitted from a specific subframe (eg, the (k + 1) th subframe or the (k + 2) th subframe).
  • a specific subframe eg, the (k + 1) th subframe or the (k + 2) th subframe.
  • the uplink grant DCI of the primary scheduling step does not include fixed subframe information, but includes subframe index information based on when the secondary scheduling information of the secondary scheduling step is received. Can be.
  • subframe index information for uplink subframe transmission may not be included in the uplink grant DCI. This is because the transmission time of the actual uplink subframe may vary depending on the channel occupancy result. Therefore, in the first scheduling step, uplink scheduling information other than subframe information related to a transmission time point may be delivered to the terminal.
  • the UE may detect an information bit (hereinafter, referred to as 'first information bit') indicating a multiple scheduling method from a DCI including scheduling information (DCI of a first scheduling step).
  • the first information bit may be included in DCI format 0A, DCI format 0B, DCI format 4A, or DCI format 4B.
  • the 'Timing offset' field means a value of k at (n + 4 + k), which is a transmission point of an uplink subframe scheduled by the DCI transmitted in the nth subframe, and has a value from 0 to 15. Can have.
  • the terminal can transmit the uplink at a designated time.
  • the time point at which the UE transmits the uplink may be determined through at least one of the following three methods (eg, method M100, method M110, and method M120).
  • Method M100 is a terminal transmits an uplink at a predefined time point.
  • the predefined time point is a subframe after a predetermined time (eg, (m + 1) from the mth subframe (eg, (n + 4) th subframe of FIG. 13) including the scheduling of the secondary scheduling step. ) Subframe or (m + 2) th subframe).
  • Method M200 includes transmission subframe information in the scheduling DCI of the secondary scheduling step.
  • the method M300 simultaneously uses information bit (s) (eg, first information bits) and 'Timing offset' information indicating a multiple scheduling method.
  • the value of the 'Timing offset' field is the mth subframe (eg, (n + 4) in FIG. 13) including the scheduling of the secondary scheduling step.
  • the information bits (eg, first information bits) indicating the multiple scheduling method in the primary scheduling step may be included in the common DCI or included in each uplink scheduling DCI.
  • all uplink scheduling of the corresponding subframe may be defined as using the multiple scheduling method. This is because collision may occur when uplink is scheduled through the existing single scheduling method while the multiple scheduling method is defined. Therefore, all uplinks can be scheduled through the same multiple scheduling method.
  • the multi-scheduling method may be applied only to the terminals of the designated terminal group according to the information bits (eg, the first information bits) indicating the multi-scheduling method.
  • the information bits eg, the first information bits
  • the terminal configuration information bits e.g, the first information bits
  • the terminal configuration information bits are detected in the scheduling of the secondary scheduling step
  • the terminal of the terminal group corresponding to the detected group configuration information bits is assigned to the uplink sub.
  • the frame can be transmitted at a specified time. For example, when a terminal belongs to a terminal group indicated by the group configuration information bit included in the secondary scheduling information, the terminal may transmit an uplink signal at a designated time.
  • UE group information may be signaled to the UE through an upper message (eg, an RRC message).
  • an upper message eg, an RRC message.
  • information bits eg, group configuration information bits
  • the uplink scheduling of the UE included in the UE group may be determined to be multiple scheduling.
  • DCI Downlink scheduling
  • a subframe including information bits (eg, first information bits) indicating multiple scheduling methods of all or some terminal groups is expected to be scheduled through the multiple scheduling method.
  • information bits eg, first information bits
  • the same information bits eg, first information bits
  • the terminal may transmit the uplink according to the scheduling information of the first scheduling step based on the designated transmission time point.
  • Secondary scheduling information of the secondary scheduling step may be included in the common DCI and transmitted.
  • the PHICH sequence included in the subframe of the scheduling for the primary scheduling step may be transmitted in the same subframe of the scheduling for the secondary scheduling step.
  • the terminal detects the same PHICH sequence, it is possible to confirm the scheduling of the first scheduling step and the scheduling of the secondary scheduling step.
  • the multiple scheduling method may be signaled by the RRC message.
  • the multiple scheduling method is activated through the RRC message, the uplink subframe scheduled afterwards is defined only through the multiple scheduling method.
  • multiple scheduling methods are deactivated via RRC messages, a single scheduling method becomes possible.
  • a subframe including an activation or deactivation message eg, an RRC message
  • the multiple scheduling method may be defined as being activated or deactivated after the (n + y) th subframe.
  • the LBT procedure for uplink channel access scheduled through the multi-scheduling method may follow LBT parameter information signaled through DCI format 0A, DCI format 0B, DCI format 4A, or DCI format 4B.
  • the communication node performs a single sensing of 25 us, or clears and senses a gap of 16 us. Can be sent without.
  • constraints of the multiple scheduling method may be as follows.
  • the terminal may not receive other uplink scheduling until the uplink scheduled through the multiple scheduling method is transmitted. This is because the uplink transmission time based on the multiple scheduling method is not fixed, and thus may collide with the uplink scheduling of the single scheduling method (eg, fixed at (n + 4 + k)).
  • the terminal may ignore or initialize scheduling of the previous multiple scheduling method.
  • the terminal may ignore or initialize scheduling of the previous multiple scheduling method based on one of an uplink transmission time based on a single scheduling and a time point when the single scheduling information is confirmed. This is because the UE may not detect the secondary scheduling step of the multi-scheduling. This is because the base station does not perform a single scheduling in a state where multiple scheduling is performed to the terminal.
  • the scheduling (eg, secondary scheduling information) of the secondary scheduling step is received within a predetermined time (eg, X subframes) from the scheduling time point (eg, the nth subframe) of the primary scheduling step. If not, the terminal may ignore or initialize the scheduling of the first scheduling step. For example, when secondary scheduling information is not received within a predetermined time (eg, X subframes) from the primary downlink subframe (eg, the nth subframe), the terminal invalidates the primary scheduling information. (invalid)
  • the value of X may be signaled to the terminal by the RRC message.
  • the value of X may be fixed to a specific value in consideration of the value of the 'Timing offset' field (eg, from (n + 4 + 15), the value of X may be 19). That is, the value of X may be indicated by a 'Timing offset' field (eg, a field indicating a timing offset for uplink transmission) included in the DCI. Alternatively, the value of X may be signaled through scheduling in the primary scheduling step (eg, the value of X is included in the primary scheduling information).
  • the embodiment of the present invention is not implemented only through the apparatus and / or method described so far, but may be implemented through a program that realizes a function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded.
  • Such implementations can be readily implemented by those skilled in the art from the description of the above-described embodiments.
  • Methods according to embodiments of the present invention may be implemented in the form of program instructions that may be executed by various computer means, and may be recorded on a computer readable medium.
  • Computer-readable media may include, alone or in combination with the program instructions, data files, data structures, and the like.
  • the program instructions recorded on the computer readable medium may be those specially designed and configured for the present invention, or may be known and available to those skilled in computer software.
  • Examples of computer readable media may include hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like.
  • Examples of program instructions may include not only machine code such as produced by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like.
  • the hardware device described above may be configured to operate with at least one software module to perform the operations of the present invention, and vice versa.

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Abstract

L'invention concerne un procédé d'émission, par un terminal, d'un signal de liaison montante dans une bande sans licence. Le terminal reçoit des premières informations de programmation permettant de programmer au moins une sous-trame de liaison montante depuis une station de base dans une première sous-trame de liaison descendante. Le terminal reçoit des secondes informations de programmation permettant de déterminer un instant d'émission d'un signal de liaison montante depuis la station de base dans une seconde sous-trame de liaison descendante après la première sous-trame de liaison descendante. Le terminal émet le signal de liaison montante dans la première sous-trame de liaison montante correspondant à l'instant d'émission parmi la ou les sous-trames de liaison montante.
PCT/KR2017/000954 2016-01-29 2017-01-26 Procédé et appareil d'émission de signaux dans un système de communication dans une bande sans licence, procédé et appareil de programmation de liaison montante, et procédé et appareil de transmission d'informations sur intervalle de mesure d'état de canal WO2017131465A1 (fr)

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CN201780003888.6A CN108271430B (zh) 2016-01-29 2017-01-26 用于在非授权频带中发送上行链路信号的方法和终端
EP17744586.3A EP3410613A4 (fr) 2016-01-29 2017-01-26 Procédé et appareil d'émission de signaux dans un système de communication dans une bande sans licence, procédé et appareil de programmation de liaison montante, et procédé et appareil de transmission d'informations sur intervalle de mesure d'état de canal
US15/771,362 US11140690B2 (en) 2016-01-29 2017-01-26 Method and apparatus for transmitting signal in unlicensed band communication system, method and apparatus for scheduling uplink, and method and apparatus for transmitting information about channel state measurement section

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KR1020170012229A KR102574506B1 (ko) 2016-01-29 2017-01-25 비면허대역 통신 시스템에서 신호를 전송하는 방법 및 장치, 상향링크 스케줄링 방법 및 장치, 그리고 채널 상태 측정 구간에 관한 정보를 전송하는 방법 및 장치

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WO2019031882A1 (fr) * 2017-08-10 2019-02-14 Samsung Electronics Co., Ltd. Procédé et appareil de commande de puissance de transmission d'un terminal dans un système de communication mobile
US10462756B2 (en) 2017-08-10 2019-10-29 Samsung Electronics Co., Ltd Method and apparatus for controlling transmission power of terminal in mobile communication system
WO2020032706A1 (fr) * 2018-08-09 2020-02-13 엘지전자 주식회사 Procédé d'exécution d'une action selon un type lbt dans une bande sans licence dans un système de communication sans fil et équipement utilisateur l'utilisant
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WO2020032758A1 (fr) * 2018-08-10 2020-02-13 엘지전자 주식회사 Procédé et appareil d'émission ou de réception de signal dans un système de communication sans fil
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US11582077B2 (en) 2019-02-25 2023-02-14 Huawei Technologies Co., Ltd. Systems and methods for transmission of uplink control information over multiple carriers in unlicensed spectrum
US12009956B2 (en) 2019-02-25 2024-06-11 Huawei Technologies Co., Ltd. Systems and methods for transmission of uplink control information over multiple carriers in unlicensed spectrum
CN113472494A (zh) * 2020-03-31 2021-10-01 北京紫光展锐通信技术有限公司 上行传输的信道接入方法及装置、存储介质、终端
CN113472494B (zh) * 2020-03-31 2023-10-13 北京紫光展锐通信技术有限公司 上行传输的信道接入方法及装置、存储介质、终端

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