WO2021179193A1 - Accès basé sur un conflit et permettant une transmission en liaison montante avec agrégation de porteuses - Google Patents

Accès basé sur un conflit et permettant une transmission en liaison montante avec agrégation de porteuses Download PDF

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Publication number
WO2021179193A1
WO2021179193A1 PCT/CN2020/078710 CN2020078710W WO2021179193A1 WO 2021179193 A1 WO2021179193 A1 WO 2021179193A1 CN 2020078710 W CN2020078710 W CN 2020078710W WO 2021179193 A1 WO2021179193 A1 WO 2021179193A1
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Prior art keywords
component carriers
subset
lbt
uplink communication
procedures
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PCT/CN2020/078710
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English (en)
Inventor
Changlong Xu
Jing Sun
Xiaoxia Zhang
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Qualcomm Incorporated
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Priority to PCT/CN2020/078710 priority Critical patent/WO2021179193A1/fr
Publication of WO2021179193A1 publication Critical patent/WO2021179193A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]

Definitions

  • aspects of the present disclosure generally relate to wireless communication and to techniques and apparatuses for contention-based access for uplink transmission with carrier aggregation.
  • Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts.
  • Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, and/or the like) .
  • multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency-division multiple access (FDMA) systems, orthogonal frequency-division multiple access (OFDMA) systems, single-carrier frequency-division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and Long Term Evolution (LTE) .
  • LTE/LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP) .
  • UMTS Universal Mobile Telecommunications System
  • a wireless communication network may include a number of base stations (BSs) that can support communication for a number of user equipment (UEs) .
  • a user equipment (UE) may communicate with a base station (BS) via the downlink and uplink.
  • the downlink (or forward link) refers to the communication link from the BS to the UE
  • the uplink (or reverse link) refers to the communication link from the UE to the BS.
  • a BS may be referred to as a Node B, a gNB, an access point (AP) , a radio head, a transmit receive point (TRP) , a New Radio (NR) BS, a 5G Node B, and/or the like.
  • New Radio which may also be referred to as 5G, is a set of enhancements to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP) .
  • 3GPP Third Generation Partnership Project
  • NR is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) (CP-OFDM) on the downlink (DL) , using CP-OFDM and/or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM) ) on the uplink (UL) , as well as supporting beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.
  • OFDM orthogonal frequency division multiplexing
  • SC-FDM e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)
  • DFT-s-OFDM discrete Fourier transform spread OFDM
  • MIMO multiple-input multiple-output
  • a method of wireless communication may include identifying a plurality of component carriers for an uplink communication, wherein a first subset of component carriers, of the plurality of component carriers, is included in a channel occupancy time and a second subset of component carriers, of the plurality of component carriers is not included in the channel occupancy time; performing a plurality of listen-before-talk (LBT) procedures in the plurality of component carriers based at least in part on identifying the plurality of component carriers; and selectively transmitting the uplink communication on at least one of the plurality of component carriers based at least in part on the plurality of LBT procedures.
  • LBT listen-before-talk
  • a UE for wireless communication may include a memory and one or more processors operatively coupled to the memory.
  • the memory and the one or more processors may be configured to identify a plurality of component carriers for an uplink communication, wherein a first subset of component carriers, of the plurality of component carriers, is included in a channel occupancy time and a second subset of component carriers, of the plurality of component carriers is not included in the channel occupancy time; perform a plurality of LBT procedures in the plurality of component carriers based at least in part on identifying the plurality of component carriers; and selectively transmit the uplink communication on at least one of the plurality of component carriers based at least in part on the plurality of LBT procedures.
  • a non-transitory computer-readable medium may store one or more instructions for wireless communication.
  • the one or more instructions when executed by one or more processors of a UE, may cause the one or more processors to identify a plurality of component carriers for an uplink communication, wherein a first subset of component carriers, of the plurality of component carriers, is included in a channel occupancy time and a second subset of component carriers, of the plurality of component carriers is not included in the channel occupancy time; perform a plurality of LBT procedures in the plurality of component carriers based at least in part on identifying the plurality of component carriers; and selectively transmit the uplink communication on at least one of the plurality of component carriers based at least in part on the plurality of LBT procedures.
  • an apparatus for wireless communication may include means for identifying a plurality of component carriers for an uplink communication, wherein a first subset of component carriers, of the plurality of component carriers, is included in a channel occupancy time and a second subset of component carriers, of the plurality of component carriers is not included in the channel occupancy time; means for performing a plurality of LBT procedures in the plurality of component carriers based at least in part on identifying the plurality of component carriers; and means for selectively transmitting the uplink communication on at least one of the plurality of component carriers based at least in part on the plurality of LBT procedures.
  • aspects generally include a method, apparatus, system, computer program product, non-transitory computer-readable medium, user equipment, base station, wireless communication device, and/or processing system as substantially described herein with reference to and as illustrated by the drawings and specification.
  • Fig. 1 is a block diagram conceptually illustrating an example of a wireless communication network, in accordance with various aspects of the present disclosure.
  • Fig. 2 is a block diagram conceptually illustrating an example of a base station in communication with a UE in a wireless communication network, in accordance with various aspects of the present disclosure.
  • Figs. 3A–3G are diagrams illustrating an example of contention-based access for uplink transmission with carrier aggregation, in accordance with various aspects of the present disclosure.
  • Fig. 4 is a diagram illustrating an example process performed, for example, by a UE, in accordance with various aspects of the present disclosure.
  • Fig. 5 is a conceptual data flow diagram illustrating an example of a data flow between different components in an example apparatus, in accordance with various aspects of the present disclosure.
  • Fig. 6 is a diagram illustrating an example of a hardware implementation for an apparatus employing a processing system, in accordance with various aspects of the present disclosure.
  • Fig. 1 is a diagram illustrating a wireless network 100 in which aspects of the present disclosure may be practiced.
  • the wireless network 100 may be an LTE network or some other wireless network, such as a 5G or NR network.
  • the wireless network 100 may include a number of BSs 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities.
  • a BS is an entity that communicates with user equipment (UEs) and may also be referred to as a base station, a NR BS, a Node B, a gNB, a 5G node B (NB) , an access point, a transmit receive point (TRP) , and/or the like.
  • Each BS may provide communication coverage for a particular geographic area.
  • the term “cell” can refer to a coverage area of a BS and/or a BS subsystem serving this coverage area, depending on the context in which the term is used.
  • a BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and/or another type of cell.
  • a macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscription.
  • a pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscription.
  • a femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access by UEs having association with the femto cell (e.g., UEs in a closed subscriber group (CSG) ) .
  • a BS for a macro cell may be referred to as a macro BS.
  • a BS for a pico cell may be referred to as a pico BS.
  • a BS for a femto cell may be referred to as a femto BS or a home BS.
  • a BS 110a may be a macro BS for a macro cell 102a
  • a BS 110b may be a pico BS for a pico cell 102b
  • a BS 110c may be a femto BS for a femto cell 102c.
  • a BS may support one or multiple (e.g., three) cells.
  • eNB base station
  • NR BS NR BS
  • gNB gNode B
  • AP AP
  • node B node B
  • 5G NB 5G NB
  • cell may be used interchangeably herein.
  • a cell may not necessarily be stationary, and the geographic area of the cell may move according to the location of a mobile BS.
  • the BSs may be interconnected to one another and/or to one or more other BSs or network nodes (not shown) in the wireless network 100 through various types of backhaul interfaces such as a direct physical connection, a virtual network, and/or the like using any suitable transport network.
  • Wireless network 100 may also include relay stations.
  • a relay station is an entity that can receive a transmission of data from an upstream station (e.g., a BS or a UE) and send a transmission of the data to a downstream station (e.g., a UE or a BS) .
  • a relay station may also be a UE that can relay transmissions for other UEs.
  • a relay station 110d may communicate with macro BS 110a and a UE 120d in order to facilitate communication between BS 110a and UE 120d.
  • a relay station may also be referred to as a relay BS, a relay base station, a relay, and/or the like.
  • Wireless network 100 may be a heterogeneous network that includes BSs of different types, e.g., macro BSs, pico BSs, femto BSs, relay BSs, and/or the like. These different types of BSs may have different transmit power levels, different coverage areas, and different impacts on interference in wireless network 100.
  • macro BSs may have a high transmit power level (e.g., 5 to 40 Watts) whereas pico BSs, femto BSs, and relay BSs may have lower transmit power levels (e.g., 0.1 to 2 Watts) .
  • a network controller 130 may couple to a set of BSs and may provide coordination and control for these BSs.
  • Network controller 130 may communicate with the BSs via a backhaul.
  • the BSs may also communicate with one another, e.g., directly or indirectly via a wireless or wireline backhaul.
  • UEs 120 may be dispersed throughout wireless network 100, and each UE may be stationary or mobile.
  • a UE may also be referred to as an access terminal, a terminal, a mobile station, a subscriber unit, a station, and/or the like.
  • a UE may be a cellular phone (e.g., a smart phone) , a personal digital assistant (PDA) , a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, biometric sensors/devices, wearable devices (smart watches, smart clothing, smart glasses, smart wrist bands, smart jewelry (e.g., smart ring, smart bracelet) ) , an entertainment device (e.g., a music or video device, or a satellite radio) , a vehicular component or sensor, smart meters/sensors, industrial manufacturing equipment, a global positioning system device, or any other suitable device that is configured to communicate via a wireless or wired medium.
  • PDA personal digital assistant
  • WLL wireless local loop
  • MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, and/or the like, that may communicate with a base station, another device (e.g., remote device) , or some other entity.
  • a wireless node may provide, for example, connectivity for or to a network (e.g., a wide area network such as Internet or a cellular network) via a wired or wireless communication link.
  • Some UEs may be considered Internet-of-Things (IoT) devices, and/or may be implemented as NB-IoT (narrowband internet of things) devices.
  • Some UEs may be considered a Customer Premises Equipment (CPE) .
  • UE 120 may be included inside a housing that houses components of UE 120, such as processor components, memory components, and/or the like.
  • any number of wireless networks may be deployed in a given geographic area.
  • Each wireless network may support a particular radio access technology (RAT) and may operate on one or more frequencies.
  • a RAT may also be referred to as a radio technology, an air interface, and/or the like.
  • a frequency may also be referred to as a carrier, a frequency channel, and/or the like.
  • Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs.
  • NR or 5G RAT networks may be deployed.
  • two or more UEs 120 may communicate directly using one or more sidelink channels (e.g., without using a base station 110 as an intermediary to communicate with one another) .
  • the UEs 120 may communicate using peer-to-peer (P2P) communications, device-to-device (D2D) communications, a vehicle-to-everything (V2X) protocol (e.g., which may include a vehicle-to-vehicle (V2V) protocol, a vehicle-to-infrastructure (V2I) protocol, and/or the like) , a mesh network, and/or the like.
  • V2X vehicle-to-everything
  • the UE 120 may perform scheduling operations, resource selection operations, and/or other operations described elsewhere herein as being performed by the base station 110.
  • Fig. 1 is provided as an example. Other examples may differ from what is described with regard to Fig. 1.
  • Fig. 2 shows a block diagram of a design 200 of base station 110 and UE 120, which may be one of the base stations and one of the UEs in Fig. 1.
  • Base station 110 may be equipped with T antennas 234a through 234t
  • UE 120 may be equipped with R antennas 252a through 252r, where in general T ⁇ 1 and R ⁇ 1.
  • a transmit processor 220 may receive data from a data source 212 for one or more UEs, select one or more modulation and coding schemes (MCS) for each UE based at least in part on channel quality indicators (CQIs) received from the UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS (s) selected for the UE, and provide data symbols for all UEs. Transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI) and/or the like) and control information (e.g., CQI requests, grants, upper layer signaling, and/or the like) and provide overhead symbols and control symbols.
  • MCS modulation and coding schemes
  • Transmit processor 220 may also generate reference symbols for reference signals (e.g., the cell-specific reference signal (CRS) ) and synchronization signals (e.g., the primary synchronization signal (PSS) and secondary synchronization signal (SSS) ) .
  • a transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, the overhead symbols, and/or the reference symbols, if applicable, and may provide T output symbol streams to T modulators (MODs) 232a through 232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM and/or the like) to obtain an output sample stream.
  • TX transmit
  • MIMO multiple-input multiple-output
  • Each modulator 232 may process a respective output symbol stream (e.g., for OFDM and/or the like) to obtain an output sample stream.
  • Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal.
  • T downlink signals from modulators 232a through 232t may be transmitted via T antennas 234a through 234t, respectively.
  • the synchronization signals can be generated with location encoding to convey additional information.
  • antennas 252a through 252r may receive the downlink signals from base station 110 and/or other base stations and may provide received signals to demodulators (DEMODs) 254a through 254r, respectively.
  • Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) a received signal to obtain input samples.
  • Each demodulator 254 may further process the input samples (e.g., for OFDM and/or the like) to obtain received symbols.
  • a MIMO detector 256 may obtain received symbols from all R demodulators 254a through 254r, perform MIMO detection on the received symbols if applicable, and provide detected symbols.
  • a receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to a data sink 260, and provide decoded control information and system information to a controller/processor 280.
  • a channel processor may determine reference signal received power (RSRP) , received signal strength indicator (RSSI) , reference signal received quality (RSRQ) , channel quality indicator (CQI) , and/or the like.
  • RSRP reference signal received power
  • RSSI received signal strength indicator
  • RSRQ reference signal received quality
  • CQI channel quality indicator
  • one or more components of UE 120 may be included in a housing.
  • a transmit processor 264 may receive and process data from a data source 262 and control information (e.g., for reports comprising RSRP, RSSI, RSRQ, CQI, and/or the like) from controller/processor 280. Transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from transmit processor 264 may be precoded by a TX MIMO processor 266 if applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, and/or the like) , and transmitted to base station 110.
  • modulators 254a through 254r e.g., for DFT-s-OFDM, CP-OFDM, and/or the like
  • the uplink signals from UE 120 and other UEs may be received by antennas 234, processed by demodulators 232, detected by a MIMO detector 236 if applicable, and further processed by a receive processor 238 to obtain decoded data and control information sent by UE 120.
  • Receive processor 238 may provide the decoded data to a data sink 239 and the decoded control information to controller/processor 240.
  • Base station 110 may include communication unit 244 and communicate to network controller 130 via communication unit 244.
  • Network controller 130 may include communication unit 294, controller/processor 290, and memory 292.
  • Controller/processor 240 of base station 110, controller/processor 280 of UE 120, and/or any other component (s) of Fig. 2 may perform one or more techniques associated with contention-based access for uplink transmission with carrier aggregation, as described in more detail elsewhere herein.
  • controller/processor 240 of base station 110, controller/processor 280 of UE 120, and/or any other component (s) of Fig. 2 may perform or direct operations of, for example, process 400 of Fig. 4 and/or other processes as described herein.
  • Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively.
  • memory 242 and/or memory 282 may comprise a non-transitory computer-readable medium storing one or more instructions for wireless communication.
  • the one or more instructions when executed by one or more processors of the base station 110 and/or the UE 120, may perform or direct operations of, for example, process 400 of Fig. 4 and/or other processes as described herein.
  • a scheduler 246 may schedule UEs for data transmission on the downlink and/or uplink.
  • UE 120 may include means for identifying a plurality of component carriers for an uplink communication, wherein a first subset of component carriers, of the plurality of component carriers, is included in a channel occupancy time and a second subset of component carriers, of the plurality of component carriers is not included in the channel occupancy time, means for performing a plurality of LBT procedures in the plurality of component carriers based at least in part on identifying the plurality of component carriers, means for selectively transmitting the uplink communication on at least one of the plurality of component carriers based at least in part on the plurality of LBT procedures, and/or the like.
  • such means may include one or more components of UE 120 described in connection with Fig. 2, such as controller/processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, and/or the like.
  • Fig. 2 is provided as an example. Other examples may differ from what is described with regard to Fig. 2.
  • a plurality of UEs may attempt to reserve resources for communication with, for example, a BS using a contention-based access procedure.
  • a first UE may perform a listen-before-talk (LBT) procedure that includes monitoring for and/or transmitting signaling to reserve resources for a subsequent communication.
  • LBT listen-before-talk
  • the first UE may, for example, transmit an uplink communication to a BS.
  • the LBT procedure may be a category-2 LBT procedure (e.g., LBT without random back off) , a category-4 LBT procedure (e.g., LBT with random back off and with a variable size contention window) , and/or the like.
  • a category-2 LBT procedure e.g., LBT without random back off
  • a category-4 LBT procedure e.g., LBT with random back off and with a variable size contention window
  • a dynamic uplink grant or a configured uplink transmission may span a plurality of LBT sub-bands or channels (e.g., a scheduled uplink transmission for which a UE is to reserve resources may be scheduled for a plurality of component carriers) .
  • a configured uplink transmission may span a first LBT sub-band of the plurality of sub-bands and a second LBT sub-band of the plurality of LBT sub-bands.
  • a configured uplink transmission may span a plurality of sub-bands or channels when uplink carrier aggregation is enabled for a UE and the UE is configured for transmission on a plurality of uplink carriers, each including a plurality of LBT sub-bands.
  • a BS may have medium access on a first component carrier, but may lack medium access on one or more other component carriers.
  • a first component carrier may be in a channel occupancy time (COT) of the BS and a second component carrier may not be in the COT of the BS.
  • COT channel occupancy time
  • performing a category-4 LBT procedure in each component carrier may result in poor performance on, for example, component carriers on which the BS does not have medium access.
  • a UE may determine that a first subset of component carriers is within a BS COT and a second subset of component carriers is not within the BS COT.
  • the UE may perform different types of contention-based access procedures for the different subsets of component carriers, such as category-2 LBT for the first subset of component carriers and category-4 LBT for at least one component carrier of the second subset of component carriers.
  • the UE may perform only category-2 LBT on both the first subset of component carriers and the second subset of component carriers based at least in part on determining that the second subset of component carriers is not within the BS COT. In this way, the UE ensures that resources are reservable for uplink transmission even when the BS lacks medium access one or more component carriers.
  • Figs. 3A–3G are diagrams illustrating an example 300 of contention-based access for uplink transmission with carrier aggregation, in accordance with various aspects of the present disclosure.
  • example 300 includes a BS 110 and a UE 120.
  • UE 120 may identify a plurality of component carriers. For example, UE 120 may identify a plurality of component carriers on which to perform an LBT procedure to reserve resources for uplink transmission. In some aspects, UE 120 may determine that a first subset of the plurality of component carriers is within a COT of BS 110 and a second subset of the plurality of component carriers is not within a COT of BS 110.
  • UE 120 may receive a slot format indicator indicating that uplink transmission is allowed in a subset of component carriers that are in a COT of BS 110 and configuration information (e.g., a DCI) configuring UE 120 to use category-4 LBT to reserve resources in the subset of component carriers for uplink transmission.
  • configuration information e.g., a DCI
  • UE 120 may perform a plurality of LBT procedures on the plurality of component carriers and may transmit on an uplink based at least in part on a result of performing the plurality of LBT procedures. For example, UE 120 may perform a category-2 LBT procedure, a category-4 LBT procedure, and/or the like.
  • UE 120 may perform different channel access procedures in the first subset of the plurality of component carriers and the second subset of the plurality of component carriers. For example, UE 120 may perform category-2 LBT in each component carrier for the first subset of the plurality of component carriers (e.g., component carriers within a COT of BS 110) . In this case, UE 120 may transmit a PUSCH on an uplink using a component carrier that passes a corresponding category-2 LBT procedure. In contrast, UE 120 may randomly select one component carrier, of the second subset of the plurality of component carriers, on which to perform a category-4 LBT procedure (and may perform category-2 LBT procedures on each other component carrier of the second subset of the plurality of component carriers) . In this case, UE 120 may transmit a PUSCH using component carriers of the second subset of the plurality of component carriers if every LBT procedure performed on the second subset of the plurality of component carriers passes.
  • category-2 LBT in each component carrier for the first subset of the plurality of component
  • UE 120 performs a category-2 LBT procedure on component carrier 1 (CC1) , which is inside a COT of BS 110, that passes and transmits a PUSCH on CC1.
  • UE 120 performs a category-2 LBT procedure on component carriers 0 (CC0) and 2 (CC2) and a category-4 LBT procedure on component carrier 3 (CC3) , which are each outside the COT of BS 110.
  • CC3 component carrier 3
  • UE 120 performs a category-2 LBT procedure on CC1, which fails, and forgoes transmission on CC1.
  • category-2 LBT procedures on CC0 and CC2 pass and a category-4 LBT procedure passes in CC3, resulting in UE 120 transmitting a PUSCH on CC0, CC2, and CC3.
  • UE 120 may transmit an uplink communication on any component carrier for which an LBT procedure passes. For example, for the second subset of the plurality of component carriers, UE 120 may perform a category-4 LBT procedure on one selected component carrier and category-2 LBT procedures on other component carriers and may transmit a PUSCH on any component carrier that passes its LBT procedure. As an example, as shown in Fig. 3D, UE 120 performs a category-2 LBT on CC1 (of the first subset of component carriers of the plurality of component carriers) , which passes, and transmits a PUSCH on CC1.
  • CC1 of the first subset of component carriers of the plurality of component carriers
  • UE 120 may perform category-2 LBT procedures on CC0 and CC2 (of the second subset of component carriers of the plurality of component carriers) , which each pass, and a category-4 LBT procedure on CC3 (of the second subset of component carriers of the plurality of component carriers) , which fails.
  • UE 120 may transmit the PUSCH on CC0 and CC2 and may forgo transmitting the PUSCH on CC3.
  • UE 120 performs a category-2 LBT on CC1 (of the first subset of component carriers of the plurality of component carriers) , which fails, and forgoes transmitting a PUSCH on CC1.
  • UE 120 may performs category-2 LBT procedures on CC0, which fails, and CC2, which passes, and a category-4 LBT procedure on CC3, which passes. In this case, UE 120 may transmit the PUSCH on CC2 and CC3 and may forgo transmitting the PUSCH on CC0.
  • UE 120 may perform category-2 LBT for all component carriers of the plurality of component carriers. For example, when any component carrier is within the COT of BS 110, UE 120 may switch from performing category-4 LBT on at least one component carrier to performing category-2 LBT on all component carriers.
  • UE 120 performs category-2 LBT procedures on CC0, CC1, CC2, and CC3, and the category-2 LBT procedures pass for CC0, CC1, and CC2 and fail for CC3.
  • UE 120 may transmit a PUSCH on CC0, CC1, and CC2, and may forgo transmitting a PUSCH on CC3.
  • the category-2 LBT procedures may fail on CC0 and CC1 and may pass on CC2 and CC3.
  • UE 120 may transmit a PUSCH on CC2 and CC3 and may forgo transmitting a PUSCH on CC0 and CC1.
  • FIGS. 3A–3G are provided as an example. Other examples may differ from what is described with respect to Figs. 3A–3G.
  • Fig. 4 is a diagram illustrating an example process 400 performed, for example, by a UE, in accordance with various aspects of the present disclosure.
  • Example process 400 is an example where the UE (e.g., UE 120 and/or the like) performs operations associated with contention-based access for uplink transmission with carrier aggregation.
  • the UE e.g., UE 120 and/or the like
  • process 400 may include identifying a plurality of component carriers for an uplink communication, wherein a first subset of component carriers, of the plurality of component carriers, is included in a channel occupancy time and a second subset of component carriers, of the plurality of component carriers is not included in the channel occupancy time (block 410) .
  • the UE e.g., using receive processor 258, transmit processor 264, controller/processor 280, memory 282, and/or the like
  • a first subset of component carriers, of the plurality of component carriers is included in a channel occupancy time and a second subset of component carriers, of the plurality of component carriers is not included in the channel occupancy time.
  • process 400 may include performing a plurality of LBT procedures in the plurality of component carriers based at least in part on identifying the plurality of component carriers (block 420) .
  • the UE e.g., using receive processor 258, transmit processor 264, controller/processor 280, memory 282, and/or the like
  • process 400 may include selectively transmitting the uplink communication on at least one of the plurality of component carriers based at least in part on the plurality of LBT procedures (block 430) .
  • the UE e.g., using receive processor 258, transmit processor 264, controller/processor 280, memory 282, and/or the like
  • Process 400 may include additional aspects, such as any single aspect or any combination of aspects described below and/or in connection with one or more other processes described elsewhere herein.
  • performing the plurality of LBT procedures comprises: performing one or more category-2 LBT procedures for the first subset of component carriers; performing a category-4 LBT procedure for a single component carrier of the second subset of component carriers, and performing a category-2 LBT procedure for one or more remaining component carriers of the second subset of component carriers.
  • selectively transmitting the uplink communication comprises: transmitting the uplink communication on one or more component carriers of the first subset of component carriers for which a corresponding category-2 LBT procedure is successful.
  • the single component carrier of the second subset of component carriers is randomly selected from the second subset of component carriers.
  • selectively transmitting the uplink communication includes transmitting the uplink communication on the each of the second subset of component carriers based at least in part on each corresponding LBT procedure being successful.
  • selectively transmitting the uplink communication includes transmitting the uplink communication on one or more component carriers of the second subset of component carriers for which a corresponding LBT procedure is successful.
  • the plurality of LBT procedures are category-2 LBT procedures.
  • selectively transmitting the uplink communication includes transmitting the uplink communication on each component carrier of the plurality of component carriers for which a corresponding category-2 LBT procedure is successful.
  • process 400 may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in Fig. 4. Additionally, or alternatively, two or more of the blocks of process 400 may be performed in parallel.
  • Fig. 5 is a conceptual data flow diagram 500 illustrating the data flow between different components in an example apparatus 502.
  • the apparatus 502 may be a UE (e.g., UE 120) .
  • the apparatus 502 includes a reception component 504, an identification component 506, an LBT component 508, and/or a transmission component 510.
  • the reception component 504 may receive information associated with scheduling an uplink transmission. For example, the reception component 504 may receive a dynamic grant scheduling a PUSCH transmission that is scheduled to span a plurality of component carriers.
  • the identification component 506 may identify a first subset of the plurality of component carriers that is not within a COT of BS 550 and a second subset of the plurality of component carriers that is within the COT of BS 550.
  • the LBT component 508 may cause the reception component 504 to monitor and the transmission component 510 to transmit to perform an LBT procedure.
  • the LBT component 508 may cause a first one or more LBT procedures to occur on the first subset of the plurality of component carriers and a second one or more LBT procedures to occur on the second subset of the plurality of component carriers, as described in more detail above.
  • the transmission component 510 may transmit a PUSCH on one or more component carriers for which an LBT procedure passes, one or more component carriers for which each LBT procedure performed on each other component carrier of the same subset of component carriers passes, and/or the like, as described above.
  • the apparatus may include additional components that perform each of the blocks of the algorithm in the aforementioned process 400 of Fig. 4 and/or the like. Each block in the aforementioned process 400 of Fig. 4 and/or the like may be performed by a component and the apparatus may include one or more of those components.
  • the components may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by a processor configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by a processor, or some combination thereof.
  • Fig. 5 The number and arrangement of components shown in Fig. 5 are provided as an example. In practice, there may be additional components, fewer components, different components, or differently arranged components than those shown in Fig. 5. Furthermore, two or more components shown in Fig. 5 may be implemented within a single component, or a single component shown in Fig. 5 may be implemented as multiple, distributed components. Additionally, or alternatively, a set of components (e.g., one or more components) shown in Fig. 5 may perform one or more functions described as being performed by another set of components shown in Fig. 5.
  • Fig. 6 is a diagram 600 illustrating an example of a hardware implementation for an apparatus 502'employing a processing system 602.
  • the apparatus 502' may be a UE (e.g., UE 120) .
  • the processing system 602 may be implemented with a bus architecture, represented generally by the bus 604.
  • the bus 604 may include any number of interconnecting buses and bridges depending on the specific application of the processing system 602 and the overall design constraints.
  • the bus 604 links together various circuits including one or more processors and/or hardware components, represented by the processor 606, the components 504, 506, 508, and/or 510 and the computer-readable medium /memory 608.
  • the bus 604 may also link various other circuits such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art, and therefore will not be described any further.
  • the processing system 602 may be coupled to a transceiver 610.
  • the transceiver 610 is coupled to one or more antennas 612.
  • the transceiver 610 provides a means for communicating with various other apparatuses over a transmission medium.
  • the transceiver 610 receives a signal from the one or more antennas 612, extracts information from the received signal, and provides the extracted information to the processing system 602, specifically the reception component 504.
  • the transceiver 610 receives information from the processing system 602, specifically the transmission component 510, and based at least in part on the received information, generates a signal to be applied to the one or more antennas 612.
  • the processing system 602 includes a processor 606 coupled to a computer-readable medium /memory 608.
  • the processor 606 is responsible for general processing, including the execution of software stored on the computer-readable medium /memory 608.
  • the software when executed by the processor 606, causes the processing system 602 to perform the various functions described herein for any particular apparatus.
  • the computer-readable medium /memory 608 may also be used for storing data that is manipulated by the processor 606 when executing software.
  • the processing system further includes at least one of the components 504, 506, 508, and/or 510.
  • the components may be software modules running in the processor 606, resident/stored in the computer readable medium /memory 608, one or more hardware modules coupled to the processor 606, or some combination thereof.
  • the processing system 602 may be a component of the UE 120 and may include the memory 282 and/or at least one of the TX MIMO processor 266, the RX processor 258, and/or the controller/processor 280.
  • the apparatus 502/502'for wireless communication includes means for identifying a plurality of component carriers for an uplink communication, wherein a first subset of component carriers, of the plurality of component carriers, is included in a channel occupancy time and a second subset of component carriers, of the plurality of component carriers is not included in the channel occupancy time; means for performing a plurality of LBT procedures in the plurality of component carriers based at least in part on identifying the plurality of component carriers; means for selectively transmitting the uplink communication on at least one of the plurality of component carriers based at least in part on the plurality of LBT procedures; and/or the like.
  • the aforementioned means may be one or more of the aforementioned components of the apparatus 502 and/or the processing system 602 of the apparatus 502'configured to perform the functions recited by the aforementioned means.
  • the processing system 602 may include the TX MIMO processor 266, the RX processor 258, and/or the controller/processor 280.
  • the aforementioned means may be the TX MIMO processor 266, the RX processor 258, and/or the controller/processor 280 configured to perform the functions and/or operations recited herein.
  • Fig. 6 is provided as an example. Other examples may differ from what is described in connection with Fig. 6.
  • ком ⁇ онент is intended to be broadly construed as hardware, firmware, and/or a combination of hardware and software.
  • a processor is implemented in hardware, firmware, and/or a combination of hardware and software.
  • satisfying a threshold may, depending on the context, refer to a value being greater than the threshold, greater than or equal to the threshold, less than the threshold, less than or equal to the threshold, equal to the threshold, not equal to the threshold, and/or the like.
  • “at least one of: a, b, or c” is intended to cover a, b, c, a-b, a-c, b-c, and a-b-c, as well as any combination with multiples of the same element (e.g., a-a, a-a-a, a-a-b, a-a-c, a-b-b, a-c-c, b-b, b-b-b, b-b-c, c-c, and c-c-c or any other ordering of a, b, and c) .
  • the terms “has, ” “have, ” “having, ” and/or the like are intended to be open-ended terms. Further, the phrase “based on” is intended to mean “based, at least in part, on” unless explicitly stated otherwise.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Divers aspects de la présente divulgation concernent de manière générale la communication sans fil. Selon certains aspects, un équipement utilisateur (UE) peut exécuter les étapes consistant à : identifier une pluralité de porteuses composantes permettant une communication en liaison montante, un premier sous-ensemble de porteuses composantes, parmi la pluralité de porteuses composantes, étant intégré dans un temps d'occupation de canal et un second sous-ensemble de porteuses composantes, parmi la pluralité de porteuses composantes, n'étant pas intégré dans le temps d'occupation de canal; effectuer une pluralité de procédures d'écoute avant transmission (LBT) dans la pluralité de porteuses composantes au moins en partie sur la base de l'identification de la pluralité de porteuses composantes; et, au moins en partie sur la base de la pluralité de procédures de LBT, transmettre sélectivement la communication en liaison montante sur au moins une porteuse composante de la pluralité de porteuses composantes. La présente divulgation concerne également de nombreux autres aspects.
PCT/CN2020/078710 2020-03-11 2020-03-11 Accès basé sur un conflit et permettant une transmission en liaison montante avec agrégation de porteuses WO2021179193A1 (fr)

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Citations (3)

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Publication number Priority date Publication date Assignee Title
CN106455108A (zh) * 2015-08-07 2017-02-22 电信科学技术研究院 一种先听在说方法及装置
WO2018174613A1 (fr) * 2017-03-24 2018-09-27 Samsung Electronics Co., Ltd. Procédé de communication sans fil et équipement d'utilisateur
US20190150193A1 (en) * 2016-05-12 2019-05-16 Ntt Docomo, Inc. User terminal and radio communication method

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CN106455108A (zh) * 2015-08-07 2017-02-22 电信科学技术研究院 一种先听在说方法及装置
US20190150193A1 (en) * 2016-05-12 2019-05-16 Ntt Docomo, Inc. User terminal and radio communication method
WO2018174613A1 (fr) * 2017-03-24 2018-09-27 Samsung Electronics Co., Ltd. Procédé de communication sans fil et équipement d'utilisateur

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MEDIATEK INC: "Channel access procedure in NR-U", 3GPP DRAFT; R1-1812356_CHANNEL ACCESS PROCEDURE IN NR-U_FINAL, vol. RAN WG1, 3 November 2018 (2018-11-03), Spokane, USA, pages 1 - 4, XP051478549 *

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