WO2016163709A1 - Procédé permettant d'attribuer des ressources dans un réseau cellulaire à l'aide d'une bande non autorisée et dispositif associé - Google Patents

Procédé permettant d'attribuer des ressources dans un réseau cellulaire à l'aide d'une bande non autorisée et dispositif associé Download PDF

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WO2016163709A1
WO2016163709A1 PCT/KR2016/003499 KR2016003499W WO2016163709A1 WO 2016163709 A1 WO2016163709 A1 WO 2016163709A1 KR 2016003499 W KR2016003499 W KR 2016003499W WO 2016163709 A1 WO2016163709 A1 WO 2016163709A1
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Prior art keywords
subframe
subframes
base station
information
lbt
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PCT/KR2016/003499
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English (en)
Korean (ko)
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박승훈
문정민
류선희
정병훈
정정수
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삼성전자 주식회사
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Priority claimed from KR1020160039790A external-priority patent/KR102658360B1/ko
Application filed by 삼성전자 주식회사 filed Critical 삼성전자 주식회사
Priority to CN201680032285.4A priority Critical patent/CN107667565B/zh
Priority to US15/565,403 priority patent/US10383103B2/en
Publication of WO2016163709A1 publication Critical patent/WO2016163709A1/fr
Priority to US16/530,791 priority patent/US10728888B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0092—Indication of how the channel is divided
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/52—Allocation or scheduling criteria for wireless resources based on load
    • 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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0006—Assessment of spectral gaps suitable for allocating digitally modulated signals, e.g. for carrier allocation in cognitive radio
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • 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
    • H04W16/14—Spectrum sharing arrangements between different networks
    • 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
    • H04W72/04—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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • 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
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H04W74/0841—Random access procedures, e.g. with 4-step access with collision treatment
    • H04W74/085—Random access procedures, e.g. with 4-step access with collision treatment collision avoidance
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H04W72/1268—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of uplink data flows

Definitions

  • the present disclosure relates to a method and apparatus for allocating resources for an unlicensed band in a system sharing resources for inter-device communication.
  • a 5G communication system or a pre-5G communication system is called a system after a 4G network (Beyond 4G Network) or a system after an LTE system (Post LTE).
  • 5G communication systems are being considered for implementation in the ultra-high frequency (mmWave) band (e.g., 60 gigabyte (60 GHz) band).
  • mmWave ultra-high frequency
  • MIMI massive multi-input multi-output
  • FD-MIMO Full Dimensional MIMO
  • array antenna analog beam-forming, and large scale antenna techniques are discussed.
  • 5G communication systems have advanced small cells, advanced small cells, cloud radio access network (cloud RAN), ultra-dense network (ultra-dense network) Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation
  • cloud RAN cloud radio access network
  • ultra-dense network ultra-dense network
  • D2D Device to Device communication
  • wireless backhaul moving network
  • cooperative communication Coordinated Multi-Points (CoMP), and interference cancellation
  • Hybrid FSK and QAM Modulation FQAM and QAM Modulation
  • SWSC Slide Window Superposition Coding
  • ACM Advanced Coding Modulation
  • FBMC Fan Bank Multi Carrier
  • NOMA NOMA
  • SAP Non orthogonal multiple access
  • SCMA sparse code multiple access
  • LTE-U Unlicensed Spectrum
  • LAA Licensed-assisted Access
  • CA Carrier Aggregation
  • QoS Quality of Service
  • smooth mobility by using it as an anchor to process all control signals and signaling.
  • unlicensed bands allows for a wider data pipe, providing users with a better mobile broadband experience.
  • Unlicensed bands are shared bands that can be used by any technology and device, so most countries specify transmission regulations for using unlicensed bands.
  • the transmission power of the device using the unlicensed band may be limited to a lower level than the licensed band.
  • Transmit restrictions for shared bands provide several types of schemes to mitigate signal interference between devices. Limit the transmit power, hop the position on a time or frequency resource, use only certain resources of the entire resource, or first listen to a signal from another device and make sure that the received power of that signal is less than a certain value. There is a way to limit the transmission possible.
  • the present disclosure provides a method and apparatus for transmitting and receiving signals in a communication system.
  • the present disclosure relates to a method and apparatus for controlling physical channel parameters of a communication link in a system sharing communication resources.
  • the present disclosure provides a resource allocation method and apparatus for a cellular network that shares resources in an unlicensed band.
  • the present disclosure provides a method and apparatus for allocating resources for improving the problems of delay increase and signaling load increase due to failure of List Before Talk (LBT) in an unlicensed band.
  • LBT List Before Talk
  • the present disclosure provides a method and apparatus for minimizing loss and using frequency bands more efficiently for cellular communication in shared bands.
  • a method for allocating resources in a cellular network using an unlicensed band comprising: generating at least one resource allocation signal containing information indicating a plurality of consecutive uplink subframes that can communicate through an unlicensed band; And transmitting an allocated signal to the terminal through the unlicensed band for at least one downlink subframe, and receiving uplink data from the terminal during the consecutive uplink subframes.
  • a method is a method for receiving a resource allocation in a cellular network using an unlicensed band, the method comprising: at least one containing information indicating a plurality of consecutive uplink subframes that can communicate over the unlicensed band Receiving a resource allocation signal of the at least one downlink subframe from the base station, identifying the plurality of consecutive uplink subframes based on the resource allocation signal and other control signals, and the continuous uplink Transmitting uplink data to the base station during link subframes.
  • a base station apparatus for allocating resources in a cellular network using an unlicensed band comprising: a controller for generating at least one resource allocation signal containing information indicating a plurality of consecutive uplink subframes that can communicate through an unlicensed band; And a transceiver for transmitting a resource allocation signal to the terminal through the unlicensed band during at least one downlink subframe and receiving uplink data from the terminal during the consecutive uplink subframes.
  • An apparatus for receiving resource allocation in a cellular network using an unlicensed band, the terminal apparatus comprising: at least one downlink linking at least one resource allocation signal containing information indicating a plurality of consecutive uplink subframes that can communicate through an unlicensed band
  • a transceiver for receiving from a base station during a subframe and transmitting uplink data to the base station during the consecutive uplink subframes, and the plurality of consecutive uplink subframes based on the resource allocation signal and other control signals
  • a control unit for identifying them and notifying the transmitting / receiving unit.
  • 1A and 1B illustrate a communication procedure over an unlicensed band.
  • FIG. 2 illustrates a procedure for determining a transmission capacity of a transmission / reception link in an existing cellular communication such as LTE.
  • 3A illustrates an example of a downlink scheduling procedure applicable to an embodiment of the present disclosure.
  • 3B illustrates an example of an uplink scheduling procedure applicable to an embodiment of the present disclosure.
  • FIG. 4A illustrates a frame structure for an unlicensed band that can be applied to an embodiment of the present disclosure.
  • FIG. 4B illustrates a radio frame structure that can be applied to an embodiment of the present disclosure.
  • FIG 5 illustrates a single subframe resource allocation according to an embodiment of the present disclosure.
  • FIG. 6 illustrates a plurality of subframe resource allocations according to an embodiment of the present disclosure.
  • FIG 7 illustrates mixed subframe resource allocation according to an embodiment of the present disclosure.
  • FIG 8 illustrates multiple frame resource allocation according to an embodiment of the present disclosure.
  • FIG. 9 illustrates a UL grant and UL data transmission procedure in an existing LTE system.
  • FIG. 10 illustrates a UL grant and a UL data transmission procedure using a timing offset according to an embodiment of the present disclosure.
  • 11 and 12 illustrate a UL grant and UL data transmission procedure indicating the start and end of consecutive UL subframes according to an embodiment of the present disclosure.
  • 13 through 16 illustrate a UL grant and UL data transmission procedure indicating semi-statically indicating the start and end (length) of consecutive UL subframes according to an embodiment of the present disclosure. .
  • 17 to 21 illustrate HARQ process IDs configured for a plurality of subframes according to an embodiment of the present disclosure.
  • 22 is a flowchart illustrating an operation of a base station for performing multi-frame resource allocation according to an embodiment of the present disclosure.
  • FIG. 23 is a flowchart illustrating an operation of a terminal receiving a multi-frame resource allocation according to an embodiment of the present disclosure.
  • 24 is a flowchart illustrating a procedure for communicating multiple UL grants and data according to one embodiment of the disclosure.
  • 25 is a flowchart illustrating an operation of a base station transmitting a block ACK / NACK according to an embodiment of the present disclosure.
  • FIG. 26 is a flowchart illustrating an operation of a terminal receiving a block ACK / NACK according to an embodiment of the present disclosure.
  • FIG. 27 illustrates a hidden node problem of a Wi-Fi network according to an embodiment of the present disclosure.
  • FIG. 28 is a diagram illustrating an apparatus configuration of a terminal according to an embodiment of the present disclosure.
  • 29 is a diagram illustrating an apparatus configuration of a base station according to an embodiment of the present disclosure.
  • each block of the flowchart illustrations and combinations of flowchart illustrations may be performed by computer program instructions. Since these computer program instructions may be mounted on a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, those instructions executed through the processor of the computer or other programmable data processing equipment may be described in flow chart block (s). It creates a means to perform the functions. These computer program instructions may be stored in a computer usable or computer readable memory that can be directed to a computer or other programmable data processing equipment to implement functionality in a particular manner, and thus the computer usable or computer readable memory. It is also possible for the instructions stored in to produce an article of manufacture containing instruction means for performing the functions described in the flowchart block (s).
  • Computer program instructions may also be mounted on a computer or other programmable data processing equipment, such that a series of operating steps may be performed on the computer or other programmable data processing equipment to create a computer-implemented process to create a computer or other programmable data. Instructions for performing the processing equipment may also provide steps for performing the functions described in the flowchart block (s).
  • each block may represent a portion of a module, segment, or code that includes one or more executable instructions for executing a specified logical function (s).
  • logical function e.g., a module, segment, or code that includes one or more executable instructions for executing a specified logical function (s).
  • the functions noted in the blocks may occur out of order.
  • the two blocks shown in succession may in fact be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending on the corresponding function.
  • the term ' ⁇ part' used in the present embodiment refers to software or a hardware component such as a field-programmable gate array (FPGA) or an application specific integrated circuit (ASIC). Perform them.
  • ' ⁇ ' is not meant to be limited to software or hardware.
  • ' ⁇ Portion' may be configured to be in an addressable storage medium or may be configured to play one or more processors.
  • ' ⁇ ' means components such as software components, object-oriented software components, class components, and task components, and processes, functions, properties, procedures, and the like. Subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables.
  • the functionality provided within the components and the 'parts' may be combined into a smaller number of components and the 'parts' or further separated into additional components and the 'parts'.
  • the components and ' ⁇ ' may be implemented to play one or more CPUs in the device or secure multimedia card.
  • the main subject will be a wireless communication system having a specific channel structure, but a main subject of the present invention is to be described in other communication systems and services having a similar technical background. Applicable in a range that does not significantly deviate from the disclosed ranges, which will be possible in the judgment of a person skilled in the art.
  • a base station is an entity that communicates with a terminal and may also be referred to as a BS, a base transceiver station (BTS), a NodeB (NB), an eNodB (eNB), an access point (AP), or the like.
  • BTS base transceiver station
  • NB NodeB
  • eNB eNodB
  • AP access point
  • HetNet Heterogenous network
  • the secondary base station may be referred to as a small BS, a secondary cell (SCell), or the like.
  • a user equipment is a subject that communicates with a base station, and may also be referred to as a UE, a device, a mobile station (MS), a mobile equipment (ME), a terminal, or the like.
  • the terminal may communicate with the PCell for traffic-sensitive traffic such as transmission and reception of main system information, control signals, and voice, and traffic with an instantaneous amount of traffic such as data, for communication with the SCell.
  • the Pcell may be set as a licensed band and the SCell may be set as a shared band, that is, an unlicensed band.
  • An example of this type of cellular communication system is an LTE License-assisted Access (LAA) system.
  • LAA LTE License-assisted Access
  • a terminal additionally using a shared band may be referred to as an LAA terminal, and a terminal using only an existing license band may be referred to as an LTE terminal.
  • the terminal in the base station area may be in a radio resource control (RRC) IDLE state or in an RRC CONNECTED state.
  • RRC radio resource control
  • RRC IDLE The UE selects a base station (or cell), monitors a paging channel, acquires system information (SI), but exchanges data with the base station. Is not in a state.
  • RRC CONNECTED The UE observes a control channel and exchanges data with a base station through a data channel. In order to help the scheduling of the base station is to report the various measurement results of the base station and the neighboring base station.
  • FBE Frame Based Equipment
  • LBE Load Based Equipment
  • 1A illustrates a communication procedure through an unlicensed band in case of FBE.
  • the transmitter should perform a clear channel assessment (CCA) 102 at least 20 us (micro second) before performing the transmission 104 on the unlicensed band.
  • CCA 102 is an operation in which a transmitter measures an amount of interference to determine whether another device is currently using an unlicensed band. The transmitter does not transmit when the magnitude of the interference measured as a result of the CCA is greater than or equal to a predetermined value, and performs the transmission 104 when the magnitude of the interference is less than the predetermined value.
  • the transmission 104 has a fixed frame interval 110 and starts from the beginning of the frame immediately following the CCA interval.
  • the transmitter can occupy 106 the unlicensed band from a minimum of 1 ms to a maximum of 10 ms after performing CCA once, and then for at least 5% of the channel occupancy time (COT) 106. Take a break 108 without performing the transfer. This is called an idle period 108. If it is determined that the other device is currently using the unlicensed band as a result of performing the CCA 102, the transmitter may perform CCA again after the fixed frame period 110 has passed.
  • COT channel occupancy time
  • 1B illustrates a communication procedure through an unlicensed band in the case of an LBE.
  • the transmitter performs the CCA 112 at least 20 us before performing the transmission 116 on the unlicensed band. If the CCA 112 determines that no device is currently using an unlicensed band, the transmitter may perform transmission. However, if it is determined that another device is currently using an unlicensed band, the transmitter may perform additional CCA 114 differently from the case of FBE. This is called ECCA (Extended CCA) 114.
  • the ECCA 114 is composed of N CCAs, where N is a backoff counter value randomly selected between [1, q] and q represents a contention window size (CWS).
  • the contention window size may be given by the base station or determined by the terminal.
  • the transmitter performs transmission 116.
  • the time that the transmitter can occupy the unlicensed band, that is, the channel occupancy time 118 is at most (13/32) * q ms and can then perform ECCA again, during which time the transmitter is idle Has 120.
  • FBE and LBE each have advantages and disadvantages.
  • LBE will perform better than FBE. This is because the FBE cannot perform CCA again during a fixed frame period if the CCA fails once, but the LBE may take the action of occupying the unlicensed band by performing ECCA, that is, N additional CCAs after failing the CCA.
  • FBE is simpler than LBE in terms of scheduling, that is, transmission of a control channel.
  • the FBE may use an unlicensed band based on a subframe boundary, that is, a control channel transmission time.
  • the LBE randomly selects N, which is the number of CCAs performed by the ECCA, cannot match the subframe boundary with the start point of the use of the unlicensed band. Accordingly, in the case of the LBE, a part of the first subframe is reserved and the control channel and the data channel are transmitted from the second subframe. FBE also does less damage to nearby Wi-Fi devices that share unlicensed bands than LBEs. In general, LBEs are more likely to occupy unlicensed bands than FBEs, which means that Wi-Fi devices are taking more opportunities to occupy unlicensed bands.
  • the terminal needs to maintain a connection to the licensed band in order to provide reliable cellular communication services in a mobile environment. Therefore, the delay-sensitive services such as voice can be transmitted in the licensed band, and the data service can be transmitted using the licensed band and opportunity-unlicensed band, thereby improving the possible data rate.
  • FIG. 2 illustrates a procedure for determining a transmission capacity of a transmission / reception link in an existing cellular communication such as LTE.
  • a UE measures a reference signal (RS) 202 of a base station and reports the signal quality to a channel quality indicator (CQI) 204 to report to the base station.
  • the reference signal 202 of the base station is a common / cell-specific reference signal (CRS), a channel state information-reference signal (CSI-RS) or a UE-specific RS given only to a specific terminal. (UE-specific Reference Signal).
  • the terminal may be controlled by the base station to report to the CQI 204 indicating the channel quality to the base station periodically or aperiodically.
  • the terminal uses an uplink control channel for periodic reporting and uses an uplink data channel for aperiodic reporting.
  • the base station performs scheduling to determine which terminal to allocate physical resource blocks to, based on the CQI 204 reported by the terminal, and informs the scheduled terminals of the terminal-specific allocation information according to the result.
  • Resource allocation signal (or UL / DL grant) indicating allocated downlink resource location and resource allocation information (ie, physical channel parameters such as Modulation and Coding Scheme (MCS) index and hybrid automatic repeat request (HARQ) related information); Also referred to as ⁇ scrambled '' by the terminal's identification, for example, a cell radio network temporary identity (C-RNTI) or a mobile broadcast service (MBMS) RNTI (MB-RNTI), a physical downlink control channel (physical downlink) transmitted through a control channel (PDCCH), and the terminal that receives the resource allocation signal transmits a physical downlink through physical resource blocks indicated by the resource allocation signal.
  • PDSCH physical downlink shared channel
  • the base station can know the uplink signal quality by measuring the reference signal from the terminal.
  • the base station may use a SRS (Sounding Reference Signal) that is periodically assigned to a specific terminal (2 ⁇ 320ms).
  • SRS Sounding Reference Signal
  • DMRS DeModulation Reference Signal
  • the base station performs uplink scheduling for determining which terminal to allocate physical resource blocks to based on the CQI obtained by measuring the reference signal transmitted by the terminal, and informs the scheduled terminals of the terminal-specific allocation information according to the scheduling result.
  • the resource allocation signal indicating the allocated uplink resource is scrambled with identification information of the terminal and transmitted through the PDCCH, and the terminal receiving the resource allocation signal is a physical uplink shared channel through the physical resource blocks indicated by the resource allocation signal.
  • Uplink data on a physical uplink shared channel (PUSCH) is transmitted.
  • the UE measures the reference signal 202 (eg, CRS) transmitted by the base station every downlink subframe, and the CQI 204 is measured every uplink subframe. 2 subframes are consumed to report through a physical uplink control channel (PUCCH) allocated to a frame.
  • PUCCH physical uplink control channel
  • One subframe is required for the base station to perform channel estimation 206, and one to k subframes are required depending on the implementation for scheduling 208 for determining resource allocation and Modulation & Coding Scheme (MCS) index.
  • MCS Modulation & Coding Scheme
  • the CQI feedback delay is at least 5 ms. The longer the period of the SRS, the greater the overall CQI feedback delay.
  • the existing LTE system may provide a minimum CQI feedback delay when measuring a periodic reference signal.
  • the shared band such as the unlicensed band where rules for coexistence between different communication systems are established, the following three problems occur in applying the existing link adaptation.
  • the base station sends a periodic reference signal due to LBT regulation, or there is a possibility that the measurement amount of the periodic reference signal fluctuates even if there is no regulation problem.
  • the UE periodically performs measurement at the allocated reference signal resource location. If the base station does not succeed in the LBT attempt, if the UE does not know this fact, the measurement is performed at the resource location where the reference signal is not actually transmitted.
  • SCS short control signals
  • the terminal may experience discontinuous interference from the adjacent Wi-Fi AP / terminal or asynchronous cell base station or LTE terminal belonging to the asynchronous cell.
  • the cause of discontinuous interference is caused by a CCA or a hidden node.
  • the CCA threshold is set in the terminal, the terminal that receives a signal from a non-serving base station at a power higher than the CCA threshold does not transmit its own signal.
  • the base station succeeds and fails the LBT, since the transmission possibility of the neighboring devices of the base station is different, the difference in the amount of interference may be noticeable. This amount of interference causes inaccuracies in the reference signal measurements.
  • the first problem occurs in the case of transmitting the SRS of the terminal in the uplink.
  • the second problem is when measuring aperiodic reference signals. That is, even if the base station transmits a periodic reference signal, the UE performs measurement on the non-periodic reference signal as a result of LBT success, which may cause a problem of measurement error. Since the success or failure of the LBT is random, the channel measured at the time of the last successful LBT and the channel at the time of the successful LBT are likely to be different. When a terminal is continuously allocated a plurality of subframes, the base station may perform scheduling based on the channel quality measured in the previous subframe, but as described above, there is a delay of at least 4 ms between channel measurement and resource allocation. May occur.
  • the third problem is that an additional delay for CQI reporting occurs, making accurate channel measurement difficult. This may occur when trying to transmit data in downlink. That is, when the terminal measuring the reference signal of the base station reports to the uplink resources allocated by the base station, if the base station fails in the CCA in the case of the FBE, the terminal is delayed more than 4 subframes to receive a new grant In addition, if the UE fails the CCA for the measurement report, a delay of 4 subframes or more may additionally occur. In the same situation in the LBE method, a problem arises that the various terminals in the base station compete with each other to transmit the measurement report on the uplink.
  • the terminal since periodic channel measurement is difficult, the terminal performs CQI reporting based on channel measurement values since the base station succeeds in LBT and occupies the channel. To this end, the base station allocates resources of subframes that are close in time to the terminal.
  • the channel occupancy time (COT) must be greater than at least 4 ms so that the CQI measured in the first subframe can be reflected in the scheduling.
  • the base station cannot perform MCS determination based on accurate CQI for the four subframes for the first 4 ms, and thus selects a conservative MCS index for the subframes.
  • the terminal if the LBT of the terminal fails, that is, if the channel busy (channel busy) is detected, the terminal must receive resource allocation from the base station again, scheduling request (SR), 3ms intervals, UL grant for resource allocation , Delay of 7ms may occur according to 4ms interval and data transmission order. Accordingly, when it is determined that the LBT failure rate is high, the base station may allocate resources for consecutive subframes to one grant.
  • SR scheduling request
  • 3ms intervals 3ms intervals
  • UL grant for resource allocation UL grant for resource allocation
  • Delay of 7ms may occur according to 4ms interval and data transmission order. Accordingly, when it is determined that the LBT failure rate is high, the base station may allocate resources for consecutive subframes to one grant.
  • 3A illustrates an example of a downlink scheduling procedure applicable to an embodiment of the present disclosure.
  • the base station eNB transmits downlink resource information (DL resource) indicating physical channel parameters (eg, MCS index, etc.) allocated by scheduling to the UE (UE) and allocated resources. information) is transmitted through the PDCCH.
  • the base station transmits user data through PDSCH on the physical resource blocks indicated by the downlink resource information.
  • the terminal transmits ACK (acknowledgement) / NACK (non-ACK) that is a hybrid automatic repeat request (HARQ) response to the user data.
  • ACK acknowledgement
  • NACK non-ACK
  • HARQ hybrid automatic repeat request
  • 3B illustrates an example of an uplink scheduling procedure applicable to an embodiment of the present disclosure.
  • a UE having user data or control information to be transmitted in an uplink transmits a scheduling request (SR) to a base station through a PUCCH.
  • the base station performs scheduling in response to the SR, and transmits an uplink grant, that is, uplink resource information according to the scheduling, in step 314 through the PDCCH.
  • the scheduling takes 3ms.
  • the UE transmits user data, a buffer status report (BSR), or an available power headroom report (PHR) through a PUSCH on the physical resource block indicated by the uplink resource information. . It may take 4ms to prepare for uplink transmission on the PUSCH.
  • the base station transmits an ACK / NACK for uplink reception through the PUSCH through a physical HARQ indication channel (PHICH).
  • PHICH physical HARQ indication channel
  • FIG 4A illustrates an FBE frame structure for an unlicensed band that can be applied to an embodiment of the present disclosure.
  • one frame duration 402 may be configured with 10 subframes, that is, 10 ms when considering the LTE structure.
  • FIG. 4B illustrates a radio frame structure that can be applied to an embodiment of the present disclosure.
  • one radio frame 412 includes 10 subframes, and each subframe includes a downlink subframe 414 and a special subframe according to a UL / DL subframe configuration. a special subframe 416 or an uplink subframe 418.
  • the role, number, and location of subframes within one radio frame 412 are configured by higher base station signaling through higher layer signaling.
  • the special subframe 416 exists between the downlink subframe 414 and the uplink subframe 418, and includes a downlink pilot time slot (DwPTS) and a gap period (GP). And uplink pilot time slots (UpPTS).
  • DwPTS downlink pilot time slot
  • GP gap period
  • UpPTS uplink pilot time slots
  • DL subframes are allocated continuously in a UL / DL subframe structure used in an unlicensed band, and then UL subframes are allocated sequentially.
  • the base station may perform resource allocation if the LBT is performed in the CCA section 404 for signal transmission and the channel is determined to be empty (that is, if the LBT is successful).
  • resource allocation Various embodiments of resource allocation that may be performed by a base station are described below.
  • FIG 5 illustrates a single subframe resource allocation according to an embodiment of the present disclosure.
  • the base station uses resource control information (PDCCH or ePDCCH) 506a and 506b for each subframe included in the channel occupancy time 504 in the frame duration 502. (For example, including MCS index and / or HARQ related information).
  • the terminal may perform data communication in each corresponding subframe 508a and 508b according to the control channels 506a and 506b of each subframe. Since the base stations do not have previous CQI reports from subframes # 0 to # 3, resource allocation information is determined according to the transmission format (MCS index, etc.) determined by the base station without the CQI report. Therefore, control channels from subframes # 0 to # 3 are likely to indicate the same transmission format.
  • FIG. 6 illustrates a plurality of subframe resource allocations according to an embodiment of the present disclosure.
  • the base station transmits a control channel (PDCCH or ePDCCH) 606 of the first subframe in the frame duration 602 to determine the UE for the remaining subframes in the channel occupancy time 604.
  • Resource location and resource allocation information eg, MCS index and / or HARQ related information
  • the terminal may perform data communication in corresponding subframes 608a and 608b according to the control channel 606 of the first subframe.
  • the load of the control channel can be reduced by performing resource allocation for a plurality of subframes using the control channel 606 of one subframe, the base station is based on the CQI reported from subframe # 0. From # 4, it is not possible to assign a suitable transmission type (MCS index, etc.).
  • FIG 7 illustrates mixed subframe resource allocation according to an embodiment of the present disclosure.
  • a plurality of subframe control channels 706 for subframes # 0 to 3 and single subframe control channels 710a and 710b for subframes # 4 to 8 are separated. That is, the base station uses a control channel (PDCCH or ePDCCH) 706 of the first subframe in the frame duration 702 after the successful LBT, and a predetermined number (for example, four) subframes 708a in the channel occupancy time 704. It informs the resource location and resource allocation information of the terminal for (708b). The UE may perform data communication in four subframes 708a and 708b corresponding to the control channel 706 of the first subframe.
  • a control channel ePDCCH
  • the base station may adaptively allocate a transmission format from subframe # 4 based on the CQI reported from subframe # 0.
  • the control channels 710a and 710b for subframes after subframe # 4 in the channel occupancy time 704 include resource location and resource allocation information determined based on the CQI, and the UE includes each subframe # 4 ⁇ .
  • Data communication may be performed in each of the subframes 712a and 712b corresponding to eight control channels 710a and 710b.
  • FIG 8 illustrates multiple frame resource allocation according to an embodiment of the present disclosure.
  • the base station uses the control channel 806 of the first subframe in the first frame duration 802 after LBT success, for the first frame duration 802 and at least one frame duration 804 that follows. Notifies the resource location and resource allocation information of the terminal.
  • the terminal may perform data communication in the corresponding plurality of subframes 808a and 808b in the plurality of frame durations 802 and 804 according to the control channel 806 of the first subframe.
  • the control channel should additionally include a resource allocation signal containing information about allocated resources.
  • the base station may include a delimiter for distinguishing from an existing resource allocation signal for single subframe resource allocation in a resource allocation signal for multiple subframe resource allocation.
  • the delimiter includes a subframe number or an absolute value of a system frame number (SFN) for indicating a location of a resource to be allocated in the future, or for a subframe that sends a current resource allocation signal. It may include an offset (frame or subframe unit).
  • the base station may include information that additional allocation for N subframes (or N frames) is included in the plurality of subframe resource allocation signals.
  • the terminal When the terminal receives the control channel, the terminal distinguishes whether an existing resource allocation signal (ie, a single subframe resource allocation) is included or a new resource allocation signal for multiple subframe resource allocation is included. In the case of multiple subframe resource allocation, the terminal identifies the location of the allocated resource (a plurality of subframes or multiple frames) based on the currently received resource allocation signal. The terminal performs a data communication operation at the location of the identified resource.
  • an existing resource allocation signal ie, a single subframe resource allocation
  • a new resource allocation signal for multiple subframe resource allocation is included.
  • the terminal identifies the location of the allocated resource (a plurality of subframes or multiple frames) based on the currently received resource allocation signal.
  • the terminal performs a data communication operation at the location of the identified resource.
  • the terminal may determine whether a reference signal or a channel acquisition notification signal from the serving base station is received to confirm whether the serving base station has secured the channel.
  • the terminal performs a data communication operation according to a transmission format informed by the serving base station at a resource location previously allocated by the previously received plurality of subframe resource allocation signals.
  • the base station may instruct the terminal whether to check the reference signal or the channel acquisition notification signal of the base station. .
  • the UE performs LBT prior to resources previously allocated through a plurality of subframe resource allocation signals. If the LBT of the terminal succeeds, the terminal performs a transmission operation according to a transmission format previously informed by the base station through the resource allocation signal at the location of the pre-allocated resource. Otherwise, if the LBT of the terminal fails, the terminal waits until the next CCA interval previously allocated to perform the same LBT operation. In one embodiment, for a plurality of resources allocated by one resource allocation and CCAs performed prior to the location of the resources, the UE does not perform LBT for all the CCAs and selectively LBT for only some CCAs. You can also do The resource (s) to perform this selective LBT may be set by the base station or selected by the terminal at random or under certain conditions.
  • the terminal may transmit the success / failure information of the LBT to the base station.
  • the success / failure information of the LBT may be transmitted together with uplink data or a feedback signal, and may include a bitmap, a subframe index, and a number of success / failure subframes corresponding to a plurality of CCA intervals.
  • the terminal may report the LBT success / failure information in the immediately preceding subframe or the scheduling ID (eg, C-RNTI or M-RNTI) of the terminal of the preceding subframe or the current subframe to the base station.
  • the base station can confirm that transmission of the terminal allocated to the preceding subframe has been delayed by one subframe due to the LBT failure.
  • the scheduling ID may be replaced with a HARQ process ID according to a system.
  • the base station uses one UL grant (ie, one resource allocation signal) to indicate UL resources and transmission parameters (MCS index, etc.) for one UL subframe.
  • a minimum interval of 4 ms is required between the time of transmitting the UL grant and the location of the UL resource (for example, a UL subframe to which a PUSCH is allocated). The interval is determined in consideration of the time required for the terminal to configure the UL transmission block containing the data to be transmitted after receiving the UL grant.
  • the UL grant and the allocated PUSCH operate at fixed 4 ms intervals to simplify operation. Table 1 below lists information element (IE) fields that may be included in a UL grant in an existing LT system.
  • IE information element
  • the UL grant includes a Flag for format0 / format1A differentiation, which is a flag indicating the format of downlink control information (DCI) included in the UL grant, and a hopping flag indicating whether frequency hopping is applied in the allocated resource.
  • TPC transmit power control
  • RB_offset may be indicated by a UL grant in initial transmission and may be indicated by PHICH in retransmission.
  • the base station may instruct the PHICH to change the cyclic shift (CS) of RB_offset and DMRS for the retransmission packet.
  • each UL grant may be configured to indicate one UL resource.
  • Each UL grant indicates at least one UL resource block configured in the time / frequency domain within one UL subframe. Therefore, the base station may instruct the terminal to use UL resource blocks in the plurality of UL subframes by variously designating an interval from UL grants to corresponding PUSCHs.
  • the base station may allocate UL resource blocks for consecutive UL subframes using one grant.
  • discontinuous resource access attempts cause frequent competition and increase the probability that other devices have channels. Therefore, it is more efficient to use resources continuously after successful resource acquisition.
  • the base station may indicate an UL subframe capable of performing LBT and an UL subframe capable of transmitting PUSCH.
  • the base station may indicate an UL subframe capable of performing LBT and PUSCH transmissions and an UL subframe capable of transmitting only PUSCH.
  • the base station may further indicate an UL subframe capable of performing LBT and SRS transmission or an UL subframe capable of performing LBT and physical random access channel (PRACH) transmission.
  • the UL subframe may be indicated using a control signal for each terminal or may be indicated using a common control signal. For example, a UL subframe capable of performing LBT is indicated using a common control signal.
  • LBT UL subframes and PUSCH transmission opportunities operate in a one-to-one correspondence according to the indication of N LBT UL subframes and N PUSCH transmission opportunities (N is a positive integer) at least one time
  • N is a positive integer
  • the number of PUSCH transmission opportunities actually performed in case of LBT failure is equal to or less than N.
  • the base station may indicate LBT opportunities and PUSCH opportunities with the same control signal.
  • N successive PUSCH transmissions are initiated upon successful LBT in the LBT UL subframes according to the indication of the N LBT UL subframes and the N PUSCH transmission opportunities. If the LBT succeeds even once in the UL subframes for the LBT, the number of PUSCH transmission opportunities is equal to N despite the LBT failure.
  • the base station may use the same control signal to indicate LBT opportunities and PUSCH opportunities.
  • the LBT UL subframes and the PUSCH transmission opportunities operate in a one-to-one correspondence according to the indication of the N LBT UL subframes and the M PUSCH transmission opportunities.
  • N, M is a positive integer
  • the number of PUSCH transmission opportunities in one LBT failure is equal to or less than M.
  • the base station may indicate the LBT opportunities and the PUSCH opportunities separately using different messages.
  • M successive PUSCH transmissions are initiated upon successful LBT in the LBT UL subframes according to the indication of the N LBT UL subframes and the M PUSCH transmission opportunities. If the LBT succeeds even once in the UL subframes for the LBT, the number of PUSCH transmission opportunities is equal to M as long as the LBT succeeds in the UL subframe for the LBT despite the failure of the LBT.
  • the base station may indicate the LBT opportunities and the PUSCH opportunities separately using different messages.
  • UL subframes for N LBT may be indicated by a grant or common downlink control information (DCI), common uplink control information (UCI), RRC signaling, DL / UL It may be indicated by a separate control signal such as subframe configuration (start / length) information.
  • DCI downlink control information
  • UCI common uplink control information
  • RRC signaling DL / UL It may be indicated by a separate control signal such as subframe configuration (start / length) information.
  • N or M PUSCH transmission opportunities may be indicated by a grant or by a separate control signal such as dedicated UCI, RRC signaling, or the like. If the number of UL subframes for LBT and the number of PUSCH transmission opportunities are the same, the same signal (grant or RRC signaling) may indicate the number of UL subframes for LBT and the number of PUSCH transmission opportunities at once.
  • the UL subframes for LBT may be instructed to be discontinuously spaced at a K interval. If K is 2, the UL subframe [0, 3, 6,... ], And if K is 1, the UL subframe [0, 2, 4, 6,... ], And if K is 0, the UL subframe [0, 1, 2, 3, 4, 5, 6,... It is set to]. K may be indicated by grant, common / dedicated UCI or RRC signaling. In this case, the number M of PUSCH transmission opportunities may be set to be equal to N, or may be set to be equal to N ⁇ K.
  • the base station may transmit an index indicating one of sets of UL subframes for LBT.
  • an index of 0 indicates a set of UL subframes [0,1,2,6,7,8]
  • an index of 1 indicates a set of UL subframes [1,4,7,9].
  • each set of UL subframes may be indicated by a bitmap that may be transmitted by a base station.
  • a set of UL subframes [1,4,7,9] may be represented by bitmaps ⁇ 0,1,0,0,1,0,0,1,0,1 ⁇ .
  • the UE determines which UL subframe or which PUSCH to perform the transmission operation according to a predetermined rule.
  • a grant or RRC signaling
  • performing LBT in a specific subframe may be part of the LBT procedure of the UE. That is, the UE may start the LBT procedure before the specific subframe and perform the remaining procedure of the LBT procedure in the CCA or ECCA section of the specific subframe.
  • the UE regards a subframe after the x subframe from the subframe receiving the grant as the start of an UL subframe for LBT.
  • the UE may perform LBT in the indicated subframe and transmit UL data in the PUSCH transmission resource following success of the LBT. For example, if a grant is received in the nth subframe and the n + xth subframe is configured with [CCA] [PUSCH] (where [CCA] means a CCA period and [PUSCH] means a PUSCH period).
  • the UE performs LBT in the CCA period of the n + x th subframe, and if the LBT succeeds, performs the PUSCH transmission in the PUSCH period of the n + x th subframe.
  • the UE when the n + x th and n + x + 1 th subframes are configured with [PUSCH] [CCA], the UE performs LBT in the CCA section of the n + x th subframe, and if the LBT succeeds, n PUSCH transmission is performed in the PUSCH period of the + x + 1th subframe.
  • the UE regards the subframe indicated by the grant as a PUSCH transmission opportunity, that is, the start of a UL PUSCH transmission subframe.
  • the UE may perform LBT prior to the indicated subframe and transmit UL data in the PUSCH transmission resource of the indicated subframe. For example, if a grant indicates the n + x th subframe and the n + x th subframe is configured with [CCA] [PUSCH], the UE performs LBT in the CCA section of the n + x th subframe and LBT If it succeeds, PUSCH transmission is performed in the PUSCH interval of the n + x th subframe.
  • the UE when the grant indicates the n + x-th subframe, and the n + x-1st and n + xth subframes are configured with [PUSCH] [CCA], the UE is n + x-1th subframe.
  • the LBT is performed in the CCA interval, and if the LBT succeeds, the PUSCH transmission is performed in the PUSCH interval of the n + x th subframe.
  • the UL subframe index (ULSI) in the UL grant indicating the allocated UL subframe resource may be represented by one of various methods according to the time reference.
  • the UL subframe index is expressed based on the subframe index of the primary cell (PCell).
  • the UL subframe index is expressed based on the subframe index of the scheduling cell carrying the control channel.
  • the UL subframe index is expressed based on the subframe index of the scheduled cell carrying data.
  • the UE determines a contention window size (CWS) and performs a contention window (CW) countdown from the contention window size. do.
  • CWS contention window size
  • CW contention window countdown from the contention window size.
  • the contention window is typically an exponential back-off algorithm for accessing resources in the unlicensed band.
  • the transmitter attempts LBT for an initial CCA period, for example 20 us, and compares the energy level measured during the initial CCA period with a CCA threshold to determine the success of the LBT. If the measured energy level (in dBm) is greater than the CCA threshold, the transmitter determines that the channel is occupied (Busy), otherwise it determines that the channel is empty (Idle). If the channel is empty, the transmission may be performed immediately after the initial CCA interval. If the channel is occupied, the transmitter switches to Extended CCA (ECCA) procedure.
  • the ECCA consists of N CCAs, where N is a randomly chosen value between [1, q] and q is the CWS value.
  • the variable q can be adjusted according to the situation.
  • the range of q can be controlled between a minimum q (min_q) and a maximum q (max_q).
  • min_q is used.
  • the value of the variable q can be doubled, for example, from min_q, depending on the particular condition. For example, in the case of a wireless local area network (LAN) system, if the receiver does not send an ACK, the transmitter interprets the non-receipt of the ACK as NACK (No Acknowledge), and sets the value of q to be used in the next ECCA as min_q x 2.
  • NACK No Acknowledge
  • the transmitter sets the value of q to be used in the next ECCA to an initial value min_q.
  • Various types of backoff algorithms may be used depending on the system. For cellular mobile communication, for example, if 80% of HARQ ACK feedbacks for the first DL subframe among DL bursts (consecutive DL subframes) transmitted by the base station is NACK, the value of q may be doubled. .
  • the terminal may determine the CWS and perform a CW countdown in any of the following situations.
  • multi grants ie, grants for multi-subframes
  • operations of a terminal and a base station will be described in detail.
  • the UE determines 1) when to perform PUSCH transmission, 2) when to perform LBT, 3) what HARQ process ID to send, and 4) determines a procedure when LBT fails.
  • Various embodiments will be described.
  • Table 2 below lists information element fields included in multiple grants according to an embodiment of the present invention.
  • the UL grant may include at least one of a multi-subframe assignment (MSA) ?? Length field and an MSA-End field. Fields not included may be implicitly notified to the terminal through another control signal, or may be explicitly notified to the terminal through an upper layer message such as an RRC signaling or a system information block (SIB).
  • the MSA-length field may refer to one subframe, but may refer to the number of unit groups when a plurality of subframes continuously allocated without using LBT in the middle constitute one unit group. For example, if the basic unit of multiple subframe scheduling is set to the UE in 2 subframes (for example, by RRC signaling or SIB message), 4,5, from the nth subframe in which the UL grant is received.
  • subframes 6 and 7 When subframes 6 and 7 are allocated to the UE, two subframes, such as subframes [4, 5] and subframes [6, 7], may be allocated by being grouped into one unit group.
  • the MSA-start field may be set to 0 and 1
  • the MSA-length field may be set to 2. That is, MSA-start is also expressed as an offset based on the unit group.
  • the unit group is not explicitly set, and one burst unit (DL and UL subframes or UL subframes) may be implicitly determined. In the following embodiments, a case in which the basic unit of subframe allocation is one subframe will be described.
  • the HARQ process field may indicate one or a plurality of HARQ process IDs designated for allocated UL subframes.
  • the base station includes one HARQ process ID in the HARQ process field
  • the terminal includes the HARQ process ID indicated by the HARQ process field.
  • a subsequent predetermined number of at least one HARQ process ID and may decide to use the HARQ process IDs in the assigned UL subframes.
  • the number of subsequent HARQ process ID (s) may be determined based on the MSA-length field.
  • the base station sets the HARQ process field to HARQ process ID # 3. If the MSA-length field is 3 and the predetermined basic unit is 1, the UE determines that HARQ process IDs # 3, # 4, and # 5 are allocated based on the HARQ process field and the MSA-length field. As another example, the base station sets the HARQ process field to HARQ process ID # 3. If the MSA-length field is 3 and the predetermined basic unit is 2, the terminal is based on the HARQ process field and the MSA-length field, HARQ process ID # 3, # 4, # 5, # 6, # 7, # It is determined that 8 is allocated.
  • the base station allocates consecutive HARQ process IDs to the terminal except for the HARQ process ID (s) previously used, and the terminal newly assigns the newly allocated HARQ process ID (s) except the previously used HARQ process ID (s). Identifies the HARQ process ID (s). For example, if the HARQ process field is set to HARQ process ID # 3, the MSA-length field is 3, and the basic unit is 1, HARQ process ID # 4 is already used for uplink communication between the base station and the terminal. If so, the terminal determines that HARQ process ID # 3, # 5, # 6 has been assigned.
  • the UE may receive a UL grant from the base station through a PDCCH (or ePDCCH), and may transmit UL data through a PUSCH of a UL subframe predetermined or determined according to timing information indicated by the UL grant.
  • the terminal determines the location of a resource to be used for transmitting UL data and physical channel parameters (ie transmission parameters) according to the UL grant.
  • FIG. 9 illustrates a UL grant and UL data transmission procedure in an existing LTE system.
  • the channel occupancy time 902 present after ECCA is composed of four DL subframes and three UL subframes.
  • the timing offset between the reception time of a specific UL grant and the transmission time of UL data is fixed at 4 ms.
  • the base station selects the UL grants 904a, 904b, and 904c in the DL subframes # 1, 2, and 3 to sequentially allocate the PUSCHs 906a, 906b, and 906c to the UL subframes # 5, 6, and 7.
  • Send As an example, when the UE receives the UL grant 904a in subframe # 1, the UE may transmit UL data through the PUSCH 906a at the resource position indicated by the UL grant during subframe # 5 that is 4 ms or later.
  • FIG. 10 illustrates a UL grant and a UL data transmission procedure using a timing offset according to an embodiment of the present disclosure.
  • the channel occupancy time 1002 consists of four DL subframes and three UL subframes. No fixed timing offset is used between the UL grant and the UL data.
  • the base station may set an offset between the reception point of the UL grant and the transmission point of the UL data to the terminal through the UL grant.
  • the UL grant includes a plurality of offsets, for example, [4, 5, 6] Transmission Time Intervals (TTIs) or [0, 1, 2] TTIs, and the UE indicates when the UL grant is received.
  • TTIs Transmission Time Intervals
  • the UL subframes to which PUSCHs are allocated may be specified.
  • the TTI may be set equal to 1 ms, which is one subframe length.
  • N UL grants each including offsets for N PUSCH transmission opportunities are one It may be transmitted in a DL subframe.
  • one UL grant or a plurality of UL grants may be transmitted to indicate a plurality of PUSCH transmission opportunities.
  • the base station may include a plurality of MSA-length fields and MSA-start fields as many as MSA-length fields in a UL grant for the terminal.
  • FIG. 11 illustrates a UL grant and UL data transmission procedure indicating start and end of consecutive UL subframes according to an embodiment of the present disclosure.
  • the channel occupancy time 1102 is composed of five DL subframes and three UL subframes.
  • the base station uses one UL grant 1104 to start and end, or start and length, for successive UL subframes (ie subframes # 5, 6, 7) 1106a, 1106b, 1106c to which PUSCHs are allocated. Tells.
  • the UL grant 1104 may include at least one of the following combinations of Information Elements (IEs).
  • IEs Information Elements
  • the terminal-specific information may be applied to a specific terminal, and the common information may be applied to all terminals receiving the UL grant 1104, the common DCI, or a higher layer message.
  • start and end (length) information of consecutive UL subframes may be allocated for a UE group.
  • FIG. 12 illustrates a UL grant and UL data transmission procedure indicating the start and end of consecutive UL subframes according to an embodiment of the present disclosure.
  • the base station indicates an end subframe (ie, subframe # 7) 1206c of consecutive UL subframes to which PUSCHs are allocated. Transmits a UL grant 1204a including end (or start) information, and indicates start (or end, or length) information indicating a first subframe (ie, subframe # 5) 1206a in a subsequent subframe # 1. Transmit the UL grant 1204b including.
  • the UE may prepare for UL data transmission by receiving the UL grant 1204a, and specifies UL subframes 1206a, 1206b, and 1206c to transmit UL data by receiving the UL grant 1204b.
  • the UE determines the position of the last UL subframe based on the UL grant 1204a, and prepares UL data transmission based on the UL grant 1204b, and at the same time, the UL subframes 1206a, which transmit UL data. 1206b, 1206c) can be specified.
  • start information and end (length) information indicating contiguous UL subframes capable of transmitting UL data using an unlicensed band may be i) informed by one grant, or ii) informed by two grants, respectively. Or iii) one grant and a physical layer (Layer 1: L1) signal (eg, common / dedicated DCI of PDCCH).
  • the end (length) information is determined based on i) the start timing of the start information, or ii) is determined based on the start of a DL burst (contiguous DL subframes), or iii) a UL burst.
  • (Iv) is determined based on the start of (continued UL subframes), or iv) is determined based on the subframe (i.e. special subframe) in which the DL-UL transition occurs, or v) transmits start or end (length) information. It may be determined based on one time point, vi) may be a subframe index of the primary cell (PCell), or vii) may be a subframe index of the secondary cell (SCell).
  • the start and end (length) information may be expressed by combining at least one or more of the above-described embodiments.
  • 13 through 16 illustrate a UL grant and UL data transmission procedure indicating semi-statically indicating the start and end (length) of consecutive UL subframes according to an embodiment of the present disclosure. .
  • the base station dynamically transmits start information for consecutive UL subframes 1308a, 1308b, and 1308c to which PUSCHs are allocated through the UL grant 1304.
  • Ends (lengths) 1308 of the consecutive UL subframes 1308a, 1308b, and 1308c may be semi-static and configured for each UE through RRC signaling.
  • the UE may specify UL subframes 1308a, 1308b, and 1308c capable of transmitting UL data on PUSCHs in the unlicensed band based on the RRC signaling and the UL grant 1304.
  • the UL grant 1304 or the common control signal / message may comprise one of the following combinations of information elements.
  • the terminal-specific information may be applied to a specific terminal (that is, a scheduled terminal) that has received the UL grant
  • the common information may be applied to the UL grant 1304 or all terminals that receive the common control signal / message.
  • start and end (length) information of consecutive UL subframes may be allocated for a UE group.
  • start information of consecutive UL subframes capable of transmitting UL data using an unlicensed band may be indicated by i) a grant or ii) by an L1 signal (eg, common / dedicated DCI of a PDCCH). Or, ii) may be informed by a medium access control (MAC) control element (CE). In various embodiments, the end information of the consecutive UL subframes may be i) informed by MAC CE, ii) informed by RRC signaling, iii) informed by an upper layer control signal of the data region, or iv) broadcast channel. It may be informed by a system information block (SIB) of a BCH.
  • SIB system information block
  • the start information may be determined based on i) a time point at which the grant is transmitted, ii) based on a timing of a primary cell (PCell), or iii) a DL burst of a secondary cell (SCell). It may be determined based on the start of consecutive DL subframes.
  • the end (length) information may be determined based on i) the start timing indicated by the start information, or ii) based on the start of a DL burst (contiguous DL subframes), or iii. ) May be determined based on the start of a UL burst (contiguous UL subframes), iv) may be determined based on a subframe in which DL-UL switching is performed, or v) may be determined based on a time point when the start information is transmitted.
  • the start and end (length) information may be expressed by combining at least one or more of the above-described embodiments.
  • the UL grant 1404 transmitted in subframe # 1 within the channel occupancy time 1402 may provide start information for consecutive UL subframes 1410a, 1410b, and 1410c to which PUSCHs are assigned. Include. Ends (lengths) 1408 of the consecutive UL subframes 1410a, 1410b, 1410c are commonly set for the terminals via a common L1 signal 1406, eg, common DCI or SIB of the PDCCH. The terminal may receive the common L1 signal 1406 and the UL grant 1404 to specify UL subframes 1410a, 1410b, and 1410c capable of transmitting UL data through PUSCHs in the unlicensed band.
  • a common L1 signal 1406 eg, common DCI or SIB of the PDCCH.
  • start information for consecutive UL subframes 1510a, 1510b, and 1510c to which PUSCHs are allocated may include a common L1 signal 1506, for example, channel occupancy time, Indicated by a common DCI indicating an end DL subframe in 1502, the length 1508 of the consecutive UL subframes 1510a, 1510b, and 1510c may be set for each terminal through RRC signaling. Can be.
  • the UE may specify the UL subframes 1510a, 1510b, and 1510c capable of transmitting UL data through PUSCHs in the unlicensed band by receiving the common L1 signal 1506 and RRC signaling.
  • the UL grant 1504 transmitted in subframe # 1 in the channel occupancy time 1502 may transmit transmission parameters (eg, MCS index) for UL data of the consecutive UL subframes 1510a, 1510b, and 1510c. HARQ process ID, etc.).
  • the terminal applies the terminal-specific length information given by the RRC signaling based on the first UL subframe (ie, subframe # 5) following the last DL subframe (ie, subframe # 4) indicated by the common DCI.
  • the UL subframes 1510a, 1510b, and 1510c are specified, and UL data to be transmitted through the UL subframes 1510a, 1510b, and 1510c is configured based on the UL grant 1504.
  • the start information for consecutive UL subframes 1610a, 1610b, 1610c to which PUSCHs are allocated may include a common L1 signal 1606, for example, channel occupancy time ( Indicated by a common DCI indicating the last DL subframe in 1602, the length 1608 of the consecutive UL subframes 1610a, 1610b, 1610c is set in common via an L1 signal or SIB.
  • the UL grant 1604 transmitted in subframe # 1 may transmit transmission parameters (eg, MCS index, HARQ) for UL data of consecutive UL subframes 1610a, 1610b, 1610c. Process ID, etc.).
  • the UE determines common length information given by the L1 signal or SIB based on the first UL subframe (ie, subframe # 5) following the last DL subframe (ie, subframe # 4) indicated by the common DCI. Apply to specify the UL subframes (1610a, 1610b, 1610c), and configures UL data to be transmitted through the UL subframes (1610a, 1610b, 1610c) based on the UL grant (1604).
  • the common length information is given by the L1 signal or SIB, but instead of the number of DL and UL subframes (ie, the total length of the DL and UL bursts) or the number of UL subframes (ie, the length of the UL bursts). ) May be determined based on the channel occupancy time 1602. For example, when the length of the UL burst is 3, the UE may determine three subframes, that is, subframes # 5, 6, and 7 from the first UL subframe as a transmission resource for transmitting UL data through the unlicensed band. .
  • the base station may inform the terminal semi-statically the start information and the end (length) information for consecutive UL subframes to use the unlicensed band.
  • the UE may transmit UL data through the unlicensed band during the notified UL subframes.
  • the start and end (length) information may be configured as follows.
  • the terminal-specific information is applied to a specific terminal, and the common information can be applied to all terminals receiving the start and end (length) information.
  • the start and end (length) information may be allocated for a terminal group.
  • the start information or the end (length) information may be i) informed by MAC CE, ii) informed by RRC signaling, iii) informed by higher layer control signals in the data area, or iv) broadcast channel (BCH). Can be informed by SIB.
  • the start information may be determined based on i) a time point at which a control signal indicating the start information is transmitted, ii) determined based on a timing of a primary cell, or iii) a secondary cell ( It may be determined based on the start of a DL burst (contiguous DL subframes) of the SCell).
  • the end (length) information may be determined based on i) the start timing indicated by the start information, or ii) based on the start of a DL burst (contiguous DL subframes), or iii. ) May be determined based on the start of a UL burst (contiguous UL subframes), iv) may be determined based on a subframe in which DL-UL switching is performed, or v) may be determined based on a time point when the start information is transmitted.
  • the start and end (length) information may be expressed by combining at least one or more of the above-described embodiments.
  • the UE must perform LBT and succeed before transmitting the UL data through the PUSCHs in the plurality of UL subframes indicated by the UL grant.
  • LBT time point a time point at which the UE performs LBT.
  • the CCA interval may be located in front of the first subframe (that is, the start of the PUSCH interval) capable of transmitting UL data, and the end of the subframe one preceding the subframe capable of transmitting UL data. It can also be located in the part.
  • the terminal performs LBT before every allocated UL subframe.
  • the UE receives an UL grant in an nth subframe and is instructed to transmit a PUSCH from the (n + m) th subframe to the (n + m + 3) th subframe by the UL grant.
  • the UE performs LBT in the CCA interval located immediately before every PUSCH transmission subframe.
  • the UE may perform LBT in a CCA section located in a part of the (n + m ⁇ 1) th subframe to determine transmission in the (n + m) th subframe. If the LBT succeeds, UL data transmission in one UL subframe is allowed. Thereafter, the UE performs LBT again for transmission in the next UL subframe.
  • the UE can transmit without the LBT for N consecutive UL subframes. That is, LBT is performed only once every N subframes among the allocated UL subframes.
  • the value of N is indicated semi-statically by the base station to the terminal by MAC CE, RRC signaling or higher layer message.
  • the UE determines the LBT time point of N periods based on at least one of the following criteria.
  • the base station may transmit a dynamic control signal indicating the UL subframe to perform the LBT.
  • the dynamic control signal may be, for example, at least one of a UL grant and common / dedicated L1 signaling.
  • the indication information of the UL subframe that performs the LBT may be determined based on a predetermined reference time point.
  • the reference time point may include at least one of a reception time of a UL grant including the indication information, a reception time of an L1 signaling including the indication information, a start time of a UL burst, a start time of a DL burst, and a start time of a frame of a Pcell.
  • the terminal determines the LBT time point based on the reference time point or the first LBT time point derived from the reference time point using the following indication information included in the dynamic control signal.
  • the indication information may be configured as follows.
  • subframe (s) to which LBT should be performed and subframe (s) not to perform LBT for example, may be a subframe index or bitmap.
  • the position of the next subframe in which the LBT should be performed (for example, may be a subframe index or offset);
  • At least one UL grant related to a plurality of UL subframes that can be used to transmit UL data in an unlicensed band is transmission parameters for the plurality of UL subframes, and includes frequency side resource allocation information, MCS index, and HARQ related information. It includes.
  • the HARQ-related information may include an RV and an HARQ process ID allocated for each UL subframe.
  • At least one of transmission related information except information indicating an allocation subframe in an existing UL grant may be notified through an M-UL grant or may be notified through an upper layer message (eg, RRC signaling).
  • the terminal may be allowed to reuse the same resource allocation and HARQ information a specific number of times within a specific period or at a periodic location.
  • the base station may indicate the subframe (s) for PUSCH transmission using the upcoming fastest DL burst or the earliest last DL subframe as a reference.
  • the position of the UL subframe to which the HARQ process ID specified by the M-UL grant is applied is different from that indicated by the M-UL grant, previous time information should be overwritten.
  • 17 to 21 illustrate HARQ process IDs configured for a plurality of subframes according to an embodiment of the present disclosure.
  • a base station allocates the same HARQ process ID (# 3 in the illustrated example) using UL grant (s) for a plurality of UL subframes 1702 (1704), and the HARQ process ID Is fixed during the plurality of UL subframes 1702.
  • the terminal understands that the resource positions to which the HARQ process ID is applied are fixed, and does not have a chance of retrying when the LBT fails.
  • the UE transmits UL data during subframe # 5 using HARQ process ID # 3.
  • the UE If the LBT fails for all of the allocated UL subframes (ie, subframes # 5, 6, and 7) (1708), the UE cannot have a transmission opportunity of UL data. If the LBT for the first two UL subframes (that is, subframes # 5 and 6) fails and the LBT for the last UL subframe (that is, subframe # 7) is successful (1710), the UE performs UL in subframe # 7. Data can be transferred. As an embodiment, the UE may apply HARQ TTI bundling to increase the reception performance of the base station by transmitting the same data through an extra allocated resource without completing transmission after successful LBT for subframe # 5.
  • the base station allocates the same HARQ process ID (# 3 in the illustrated example) using the UL grant (s) for the plurality of UL subframes 1802, but the HARQ process ID is 1806.
  • the plurality of UL subframes 1802 are not fixed.
  • the UE may retry the LBT for the resources of the subsequent subframes when the LBT fails.
  • the UE does not perform additional transmission in the allocated plurality of UL subframes 1802. If all of the LBTs for the allocated plurality of UL subframes 1802 are not successful (1810), and the base station informs the extended UL subframes 1804 in advance, the UE may extend the extended UL subframes. LBT may be retried for at least one of the fields 1804. For example, if the maximum allowed length of DL and UL burst is 8 ms and the allocated DL and UL burst is 6 ms, an additional 2 ms is allowed as extended UL subframes 1804. To this end, the base station may notify the terminal of the maximum allowable length of the channel occupancy time used during the current burst or a specific period by using the L1 signal or the RRC signaling.
  • the UE may use extended UL subframes after 8 ms, which are the maximum allowable lengths of the DL and UL bursts, as separate UL bursts.
  • the terminal may use LBT of category 4 rather than category 2 of LTE.
  • the UE determines whether there is at least one extended UL subframe 1804 according to the maximum allowable length. If at least one extended UL subframe 1804 is present, the terminal retries the LBT for the extended UL subframe 1804.
  • the UE subframe # 7. May transmit UL data, and extended UL subframes 1804 are not used.
  • a base station allocates a plurality of different HARQ process IDs (# 3, 4, 5 in the illustrated example) using a UL grant (s) for a plurality of UL subframes 1902. 1904
  • the UE understands that the resource locations to which the HARQ process IDs are applied are fixed and does not have a chance of retrying in case of an LBT failure.
  • the LBT succeeds in the CCA period immediately before the first UL subframe (that is, subframe # 5) (1906)
  • the UE transmits UL data during subframe # 5 using HARQ process ID # 3, but follows In subframes # 6 and # 7, the LBT fails to transmit other HARQ process IDs # 4 and # 5.
  • the UE may have a transmission opportunity for UL data of HARQ process IDs # 3, 4, and 5; none. If the LBT for the first two UL subframes (ie, subframes # 5 and 6) fails and the LBT for the last UL subframe (ie, subframe # 7) is successful (1910), the UE performs HARQ in subframe # 7.
  • UL data of process ID # 5 may be transmitted, and transmission of UL data of HARQ process ID # 3, 4 is abandoned.
  • a base station allocates a plurality of different HARQ process IDs (# 3, 4, 5 in the illustrated example) using a UL grant (s) for a plurality of UL subframes 2002.
  • the HARQ process IDs are not fixed to the plurality of UL subframes 2002 only.
  • the UE may retry the LBT for the resources of the subsequent subframes when the LBT fails.
  • the UE uses a UL grant, that is, a HARQ process ID, for the UL data that has failed the LBT for the previous UL subframe.
  • the terminal transmits UL data using a UL grant, ie, HARQ process ID, for the next UL data.
  • the operation described above may be performed within a plurality of allocated UL subframes 2002 or during extended UL subframe (s) 2004 additionally assigned by a base station.
  • the UE transmits UL data of HARQ process ID # 3 in subframe # 5. If the LBT attempt for the next UL subframe (that is, subframe # 6) fails, the UE retries the LBT to transmit UL data of HARQ process ID # 4 in the next UL subframe (that is, subframe # 7). . If all of the LBTs for the UL subframes (i.e., subframes # 6 and 7) fail, the terminal retries the LBT for the subsequent first extended UL subframe 2004, and if the LBT succeeds, the terminal HARQ process ID. Transmit UL data using # 4. Similarly, the UE succeeds in the LBT for the second extended UL subframe 2004, and can transmit UL data using HARQ process ID # 5.
  • the UE determines the LBT for the subsequent first extended UL subframe (ie, subframe # 5) (2004). Retrying, and if the LBT succeeds, the terminal may transmit UL data of HARQ process ID # 3. Next, the UE succeeds in the LBT for the second extended UL subframe (ie, subframe # 6) 2004 and transmits UL data using the HARQ process ID # 4 of the subframe # 6. Since there is no extended UL subframe, the UE does not have a transmission opportunity for HARQ process ID # 5.
  • the UE fails both LBT for the first and second UL subframes allocated (i.e., subframes # 5, 6) (2012) and succeeds in LBT for the last UL subframe allocated (i.e., subframe # 7) You can transfer data from process ID # 3. Since there is an HARQ process ID not yet used, the UE attempts LBT for the first extended UL subframe 2004 that follows, and if the LBT succeeds, the UE transmits UL data using HARQ process ID # 4. Next, the UE succeeds in the LBT for the second extended UL subframe 2004, and transmits UL data using HARQ process ID # 5.
  • the UE when the UE transmits UL data using a HARQ process ID different from the HARQ process ID indicated by the base station in a specific subframe, that is, a HARQ process ID not transmitted in the previous subframe due to an LBT failure.
  • the base station must determine the HARQ process ID changed in the corresponding subframe. For example, the UE may change the cyclic shift of the DMRS sequence according to a predetermined rule and transmit UL data using the changed cyclic shift.
  • the base station detects a cyclic shift changed according to the predetermined rule while receiving the UL data, and according to the detected cyclic shift, how many times the UE has failed LBT or HARQ process IDs among the HARQ process IDs allocated by the UL grant You can see if the IDs were dropped.
  • the base station may receive UL data using HARQ process IDs in the same order as allocated through the UL grant.
  • the base station allocates a plurality of different HARQ process IDs (# 3, 4, 5 in the illustrated example) using the UL grant (s) for the plurality of UL subframes 2102. 2106, the HARQ process IDs are fixed for the plurality of UL subframes 2102.
  • the UE may retry the LBT in the resource of the subsequent subframe when the LBT fails. When the LBT fails, the UE does not retry transmission of UL data of the same HARQ process ID in the subsequent resource. If the LBT succeeds, the UE transmits UL data according to the UL grant for the next HARQ process ID.
  • the operation described above may be performed within a plurality of allocated subframes 2102 or may be performed during extended UL subframe (s) 2104 additionally allocated by a base station.
  • the UE may retry transmission of UL data of the most recent HARQ process ID for which LBT has failed.
  • the most advanced HARQ process ID is the smallest value when the HARQ process IDs are arranged according to the order of subframe indexes assigned to the HARQ process IDs in the UL grant or the order of the HARQ process IDs.
  • the UE If the LBT for the first assigned UL subframe (that is, subframe # 5) is successful (2108), the UE transmits UL data of HARQ process ID # 3 in subframe # 5. If the LBT attempt for the next UL subframe (that is, subframe # 6) fails, the transmission of UL data of HARQ process ID # 4 is abandoned, and the UE transmits the HARQ process ID in the next UL subframe (ie, subframe # 7). Retry the LBT to transmit UL data of # 5.
  • the UE If all of the LBTs in the UL subframes (i.e., subframes # 6 and 7) fail, the UE retries the LBT for the subsequent first extended UL subframe 2104, and if the LBT succeeds, the UE fails to transmit the most.
  • the UL data is transmitted in the first extended UL subframe 2104 using the preceding HARQ process ID (ie, # 4).
  • the UE succeeds in the LBT for the second extended UL subframe 2004, and can transmit UL data using HARQ process ID # 5.
  • the UE If all LBTs fail in the allocated UL subframes (ie, subframes # 5, 6, and 7) (2110), the UE retries the LBT for the subsequent first extended UL subframe 2104, and if the LBT succeeds.
  • the UE may transmit UL data of the earliest HARQ process ID (ie, # 3) that failed to transmit in the first extended UL subframe 2104.
  • the UE succeeds in the LBT in the second extended UL subframe 2104, fails to transmit, and then transmits UL data of the HARQ process ID (ie, # 4) in the second extended UL subframe 2104. Since there is no extended UL subframe, the UE does not have a transmission opportunity for HARQ process ID # 5.
  • the UE fails both LBTs in the allocated first and second UL subframes (i.e. subframes # 5, 6) (2112) and succeeds in LBT in the assigned last UL subframe (i.e. subframe # 7) and the HARQ process ID. Can transmit data of # 5. Since there are HARQ process IDs that have not been used yet, the terminal attempts LBT for the first extended UL subframe 2104 that follows, and if the LBT succeeds, the terminal transmits UL data of HARQ process ID # 3. Next, the UE succeeds in LBT in the second extended UL subframe 2104 and transmits UL data of HARQ process ID # 4.
  • the UE transmits UL data for a HARQ process ID different from the HARQ process ID indicated by the base station in a specific extended UL subframe, that is, a HARQ process ID not transmitted in the originally allocated UL subframe.
  • the base station should determine the HARQ process ID changed in the extended UL subframe.
  • the base station may receive retransmission of UL data using the most recent HARQ process ID of the HARQ process ID (s) that failed to transmit in the non-expanded UL subframe (s).
  • 22 is a flowchart illustrating an operation of a base station for performing multi-frame resource allocation according to an embodiment of the present disclosure.
  • the base station determines whether to allocate resources of a plurality of subframes (or frames) to the terminal to support UL transmission through the unlicensed band. If it is determined that the resources of the plurality of subframes are to be allocated, the base station generates a resource allocation signal instructing resource allocation for the resources of the plurality of subframes in step 2210. On the other hand, if it is determined that it is not necessary to allocate resources of a plurality of subframes, the base station generates a resource allocation signal instructing resource allocation for resources of a single subframe in step 2220. In step 2215, the base station includes the resource allocation signal in at least one UL grant or other control signal and transmits it to the terminal.
  • the resource allocation signal may be transmitted according to at least one of the above-described embodiments.
  • the base station may transmit additional information necessary for the terminal to transmit the UL data using the unlicensed band, for example, start information and / or end (length) information, and transmission parameters in a UL grant or another control signal.
  • the base station receives UL data through the unlicensed band from the terminal during the allocated subframe (s) based on the transmitted information.
  • FIG. 23 is a flowchart illustrating an operation of a terminal receiving a multi-frame resource allocation according to an embodiment of the present disclosure.
  • a UE receives a resource allocation signal through a UL grant or another control signal from a base station.
  • the UE determines whether a plurality of subframes has been allocated based on the received signal. If a plurality of subframes has been allocated, in step 2315, the terminal identifies resource positions of the allocated subframes based on the resource allocation signal and other control signals. On the other hand, if a plurality of subframes have not been allocated, the UE identifies a resource position of a single subframe allocated based on a reception time of the resource allocation signal or another control signal in step 2325. The identification of the resource location may be made according to at least one of the previously described embodiments.
  • the UE transmits UL data to the base station through the unlicensed band during the allocated subframe (s) based on the received signal.
  • one shared band is basically set for downlink in a general scenario.
  • an operation for simultaneous radio resource access to at least two or more shared bands is required. That is, the terminal must operate on two or more shared bands.
  • the terminal may perform radio resource access for uplink through the existing PCell.
  • both downlink and uplink may be configured in one frequency band
  • the UE may transmit channel measurement report or ACK / NACK feedback for the downlink subframe in the uplink subframe. have.
  • the UE since the number of uplink subframes is set less than that of downlink subframes, there is a problem that uplink transmission is delayed after several subframes when the UE fails to acquire uplink resources. Therefore, the UE may leave the uplink subframe empty or transmit a reservation signal following the success of the LBT before a predetermined time of the next downlink subframe.
  • the uplink subframe is not used as described above, the UE may perform uplink transmission in the PCell like FDD.
  • any one of the following two feedback procedures may be used.
  • the terminal may transmit feedback on data reception of individual resources.
  • the terminal may transmit block feedback, that is, block ACK, for data reception of the plurality of resources.
  • the feedback not only indicates whether data reception is successful, but also considers the case in which transmission / reception occurs discontinuously according to the resource occupancy success of the base station. It should include information on whether it is a NACK.
  • the base station stores information on the success or failure of the LBT in the previous subframe, and confirms whether the ACK / NACK reported by the terminal corresponds to the actual data transmission can be performed by appropriately adjusting the retransmission operation for the terminal.
  • base stations with synchronized synchronization can transmit signals using frequency reuse (ie reuse-1 as defined by LTE).
  • Reuse-1 of LTE means that all adjacent base stations use the same frequency channels to maximize spectral efficiency. Since the CCA interval for performing the LBT is configured at the same timing, the terminal may receive a signal from the serving base station when the adjacent base stations do not transmit a signal. Therefore, if the frequency channel is empty by the LBT, the base stations simultaneously transmit on the frequency channel.
  • the base stations since the base stations use a randomly set backoff counter, the base stations perform the LBT at different times. Therefore, if a neighboring base station transmits a signal on a specific frequency channel first, the base station cannot perform transmission and must perform ECCA operation again after the frequency channel is empty. Even if the synchronization between the base stations belonging to the operators having the same PLMN (Public Land Mobile Network) is the same, it is impossible to use reuse-1 without solving the above problem.
  • PLMN Public Land Mobile Network
  • the signals of the base stations may be configured so that the terminal can distinguish the signals of the base stations belonging to the same operator.
  • the base station having succeeded in LBT may include the cell ID and the PLMN ID in the transmitted signal.
  • the signal transmitted from the base station should be composed of at least 67 microseconds (orthogonal frequency division multiplexing) or single carrier frequency division multiple access (SC-FDMA) symbols. Therefore, even if the signal is configured to be the shortest, the signal of the base station is longer than the CCA period of at least 20us length.
  • the transmitter (base station or terminal) stores the channel strength value or the received power value received during the CCA period in a memory and simultaneously attempts to receive signals from neighboring base stations. If a signal from at least one neighboring base station is received, the transmitter calculates a power value of the received signal, and calculates a received power value calculated from channel strength values received during previously stored CCA periods, or stored received power. Remove the sum of the received power values from the at least one neighboring base station in the value. As such, the transmitter readjusts the backoff counter according to the received power value calculated as a result of the LBT during the plurality of CCA intervals. The sum of received power values from neighbor base stations may be averaged over a predetermined time period. The sum of the averaged received power values is then used to adjust the received power values calculated in the CCA intervals. By repeatedly performing this operation, when the backoff counter becomes 0, the transmitter may transmit a signal.
  • control by the network is performed as follows.
  • a mobility management entity (MME) or control server in an operator network sets a plurality of base stations into one group.
  • the base station performs information exchange between base stations in the group by the MME or the control server or through the X2 interface.
  • the MME or control server randomly determines the value n of the backoff counter within a range of [0, N] for a specific base station group.
  • the backoff counter n may be determined by the representative base station in the base station group or the representative base station in the plurality of base station groups.
  • the plurality of base stations or the plurality of base station groups may be located at the same site or at different sites.
  • the MME or control server informs the k-off base station n of other k-1 base stations in the same group.
  • the other base stations decide to use the backoff counter n for LBT.
  • the backoff counter n may be set to other k-1 base stations by a representative base station in the base station group or the base station groups.
  • Each base station performs LBT in the ECCA interval based on the backoff counter, and decrements the backoff counter if the channel is idle.
  • the base station which is aware that the channel is busy during the ECCA period, stores the current backoff counter and freezes the LBT operation, and then the MME, the control server, or the base station group that the LBT is freezing. S report to my representative base station.
  • the reporting of the LBT stop may include the value of the stored backoff counter.
  • the base station that has performed the downlink transmission reports that the downlink transmission has been performed to the representative base station in the MME, the control server, or the base station group.
  • the MME, control server or representative base station in the base station group is the smallest of the values of the backoff counter reported from the base stations in the base station group.
  • the value of the smallest backoff counter is instructed to the k base stations.
  • Each base station instructed to readjust the backoff counter proceeds to 3) and resumes LBT again.
  • 24 is a flowchart illustrating a procedure for communicating multiple UL grants and data according to one embodiment of the disclosure.
  • the base station transmits multiple UL (M-UL) grants for allocating a plurality of UL subframes # 1, 2, 3, and 4 that can communicate through an unlicensed band.
  • the UE Immediately before the UL subframe # 1, the UE performs LBT for the CCA or the extended CCA (ECCA) 2410 and succeeds, and transmits the UL data # 1,2 for the UL subframe # 1,2.
  • the basic unit of multiple subframe scheduling is set to 2 subframes
  • the UE performs LBT for CCA or extended CCA 2415 again immediately before UL subframe # 3, and when the LBT succeeds, UL data # 3,4 is transmitted during UL subframe # 3,4.
  • the base station transmits a block ACK / NACK for the received UL data # 1, 2, 3, 4.
  • Block ACK / NACK indicates reception success / failure for UL data # 1,2,3,4.
  • the base station transmits multiple UL (M-UL) grants for allocating a plurality of UL subframes # 1, 2, 3, and 4 to communicate with the UE through an unlicensed band.
  • M-UL UL
  • the UE attempts LBT for CCA or extended CCA 2435 but fails. Then, the UE waits without performing transmission for UL subframes # 1 and 2. If the LBT is successful by attempting the LBT for the CCA or the extended CCA 2435 immediately before the UL subframe # 3, the UE may transmit the UL data # 3, 4 during the UL subframe # 3, 4, and then from the base station Receive block ACK / NACK 2440. Meanwhile, when ACK / NACK is sent to the Pcell instead of the Scell, the conventional ACK / NACK feedback procedure is used.
  • 25 is a flowchart illustrating an operation of a base station transmitting a block ACK / NACK according to an embodiment of the present disclosure.
  • a base station in step 2505, a base station generates a multi-UL (M-UL) grant for a user equipment and transmits the multi-UL grant in step 2510.
  • the base station receives UL data at the resource location allocated by the multiple UL grants, and determines in step 2520 whether the reception of the UL data is successful. If the UL data is received, in step 2525, the base station stores whether the UL data is in error and proceeds to step 2530. In step 2530, the base station transmits a block ACK / NACK indicating to the terminal whether or not the UL data error.
  • the base station determines whether the allocated UL subframe (s) no longer exists in step 2535. If there are more allocated UL subframe (s), in step 2540 the base station moves to the next assigned location and proceeds to step 2515.
  • FIG. 26 is a flowchart illustrating an operation of a terminal receiving a block ACK / NACK according to an embodiment of the present disclosure.
  • a UE receives multiple UL (M-UL) grants and determines allocated UL subframes using the multiple UL grant and, if necessary, another control signal.
  • the UE attempts LBT for CCA or ECCA immediately before the allocated UL subframe, and determines in step 2615 whether the LBT is successful. If the LBT succeeds, the UE transmits UL data during at least one UL subframe in step 2620 and proceeds to step 2625. On the other hand, if the LBT fails, proceed directly to step 2625.
  • step 2625 the UE determines whether the next CCA is set. If the next CCA is not set, the terminal proceeds to step 2635 and receives a block ACK / NACK for the transmitted UL data. On the other hand, if the next CCA is set, the UE moves to the section for the next CCA in step 2630, and proceeds to step 2610.
  • FIG. 27 illustrates a hidden node problem of a Wi-Fi network according to an embodiment of the present disclosure.
  • a UE 2704 when a UE 2704 receives a signal from a base station 2702, it may simultaneously receive a signal from a Wi-Fi AP 2706 at a location that cannot detect a signal from the base station.
  • the signal from the AP 2706 acts as interference to the desired signal (ie, the signal from the serving base station).
  • the base station 2702 since the base station 2702 can operate as a hidden node to the AP 2706, the above situation is called a hidden node problem.
  • the terminal may consider whether the base station occupies the resource when measuring the channel.
  • the UE may perform channel measurement for the following three situations.
  • the channel measurement results include a reference signal received power (RSRP) for a signal of a serving base station, a signal to interference and noise ratio (SINR) including signal and interference of the serving base station, and a received signal quality (reference).
  • RSRP reference signal received power
  • SINR signal to interference and noise ratio
  • RSSI received signal strength indicator
  • the terminal When a base station occupies a resource and a terminal is allocated a resource, the terminal performs channel measurement and can measure both CRS and DRS based RSRP, RSRQ, and RSSI.
  • the terminal may perform channel measurement and measure CRS-based RSRP and RSSI.
  • the terminal When the base station does not occupy the resource and the terminal is not allocated the resource, the terminal performs channel measurement, at this time can measure the RSSI.
  • the SINR is given by (signal power of serving base station) / ⁇ (interference signal power of hidden node) + (noise power) ⁇ .
  • the terminal may measure ⁇ (all signal power) + (noise power) ⁇ .
  • the UE may distinguish RSSI_occupied measured when the base station occupies the resource and RSSI_unoccupied measured when the base station does not occupy the resource, calculates RSSI_gap which is the difference between RSSI_occupied and RSSI_unoccupied, and calculates SINR in 1) and 2) situations.
  • the CQI value is corrected in consideration of RSSI_gap.
  • FIG. 28 is a diagram illustrating an apparatus configuration of a terminal according to an embodiment of the present disclosure.
  • the terminal 2800 includes a transceiver 2810 including a transmitter 2815 and a receiver 2820 for performing signal transmission and reception with another device, for example, a base station, and all of the terminals 2800. It may include a controller 2830 for controlling the operation. Embodiments for resource allocation of the unlicensed band described above in the present disclosure may be understood to be performed by the controller 2830. However, the controller 2830 and the transceiver 2810 are not necessarily implemented as separate modules, but may be implemented as a single component in the form of a single chip.
  • 29 is a diagram illustrating an apparatus configuration of a base station according to an embodiment of the present disclosure.
  • the base station 2900 includes a transceiver 2910 including a transmitter 2915 and a receiver 2920 for performing signal transmission and reception with another device, for example, a terminal or another base station, and a base station 2900. It may include a control unit 2930 for controlling all operations of the). Embodiments for resource allocation of the unlicensed band described above in the present disclosure may be understood to be performed by the controller 2930. However, the controller 2930 and the transceiver 2910 are not necessarily implemented as separate modules, of course, may be implemented as a single component in the form of a single chip.
  • FIGS. 1 to 29 an operation procedure of the LAA terminal, a resource frame configuration, and device configurations of the terminal and the base station are not intended to limit the scope of the present disclosure. That is, all of the components, entities, or operations described in FIGS. 1 to 26 should not be interpreted as essential components for the implementation of the invention, and only a few components may be included within the scope that does not impair the nature of the invention. It can be implemented in
  • the operations of the base station or the terminal described above can be realized by providing a memory device storing the corresponding program code to any component in the base station or the terminal device. That is, the controller of the base station or the terminal device can execute the above-described operations by reading and executing the program code stored in the memory device by the processor or the central processing unit (CPU).
  • the controller of the base station or the terminal device can execute the above-described operations by reading and executing the program code stored in the memory device by the processor or the central processing unit (CPU).
  • the various components of the entity, base station, or terminal device, module, etc. described herein are hardware circuits, for example complementary metal oxide semiconductor based logic circuits, firmware And hardware circuitry such as a combination of software and / or hardware and firmware and / or software embedded in a machine-readable medium.
  • hardware circuits for example complementary metal oxide semiconductor based logic circuits, firmware And hardware circuitry such as a combination of software and / or hardware and firmware and / or software embedded in a machine-readable medium.
  • various electrical structures and methods may be implemented using transistors, logic gates, and electrical circuits such as application specific semiconductors.

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Abstract

L'invention concerne un système de communication de cinquième génération (5G) ou de pré-cinquième génération (pré-5G) afin de prendre en charge un débit d'émission de données supérieur à celui d'un système de communication de quatrième génération (4G), tel qu'un système d'évolution à long terme (LTE). L'invention concerne un procédé et un dispositif pour émettre des informations dans un système de communication. Le procédé permettant d'attribuer des ressources dans un réseau cellulaire à l'aide d'une bande non autorisée comprend les étapes consistant : à générer au moins un signal d'attribution de ressource contenant des informations indiquant une pluralité de sous-trames de liaison montante continues susceptibles de communiquer à travers la bande non autorisée ; à émettre le signal d'attribution de ressource à destination d'un équipement utilisateur (UE) par l'intermédiaire de la bande non autorisée pendant la durée d'au moins une sous-trame de liaison descendante ; et à recevoir des données de liaison montante à partir de l'UE pendant la durée des sous-trames de liaison montante continues.
PCT/KR2016/003499 2015-04-09 2016-04-05 Procédé permettant d'attribuer des ressources dans un réseau cellulaire à l'aide d'une bande non autorisée et dispositif associé WO2016163709A1 (fr)

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CN201680032285.4A CN107667565B (zh) 2015-04-09 2016-04-05 在使用非授权频带的蜂窝网络中分配资源的方法及其设备
US15/565,403 US10383103B2 (en) 2015-04-09 2016-04-05 Method for allocating resources in cellular network using unlicensed band and device therefor
US16/530,791 US10728888B2 (en) 2015-04-09 2019-08-02 Method for allocating resources in cellular network using unlicensed band and device therefor

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US201562145151P 2015-04-09 2015-04-09
US62/145,151 2015-04-09
KR10-2016-0039790 2016-03-31
KR1020160039790A KR102658360B1 (ko) 2015-04-09 2016-03-31 비면허 대역을 사용하는 셀룰러 네트워크에서의 자원할당 방법 및 그 장치

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