WO2021254448A1 - Détection d'accès à un canal directionnel - Google Patents

Détection d'accès à un canal directionnel Download PDF

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Publication number
WO2021254448A1
WO2021254448A1 PCT/CN2021/100659 CN2021100659W WO2021254448A1 WO 2021254448 A1 WO2021254448 A1 WO 2021254448A1 CN 2021100659 W CN2021100659 W CN 2021100659W WO 2021254448 A1 WO2021254448 A1 WO 2021254448A1
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WO
WIPO (PCT)
Prior art keywords
transmission
base station
offset
threshold
listen before
Prior art date
Application number
PCT/CN2021/100659
Other languages
English (en)
Inventor
Bruno Jechoux
Virgile Garcia
Original Assignee
Tcl Communication (Ningbo) Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tcl Communication (Ningbo) Co., Ltd. filed Critical Tcl Communication (Ningbo) Co., Ltd.
Priority to CN202180043520.9A priority Critical patent/CN115918239A/zh
Publication of WO2021254448A1 publication Critical patent/WO2021254448A1/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]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
    • 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
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering

Definitions

  • the following disclosure relates to channel access sensing, and in particular to such sensing performed prior to directional transmissions.
  • UE User Equipment
  • RAN Radio Access Network
  • CN Core Network
  • Listen-before-talk is adopted as the type of channel access procedure for unlicensed operation in 3GPP design, whereby a radio transmitter is required to apply a clear channel assessment (CCA) check prior to transmission.
  • CCA involves at least energy detection (ED) over a time duration with a certain threshold (ED threshold) to determine if a channel is occupied or is clear. If the channel is occupied, random back-off within a contention window applies, so that there is a minimum time duration where the channel is clear before the transmitter can transmit. This also creates randomness among multiple contending devices and thus avoid collisions.
  • a defer period e.g.
  • a single sensing slot or CCA slot has been defined to have a duration of 9 micro seconds for 6 GHz, and 5 micro seconds for 60 GHz unlicensed spectrum by the regulatory bodies. Further it is specified a certain duration within a sensing slot over which the energy detection needs to be performed.
  • Type 1 downlink channel access procedures areperformed by a base station (eNB/gNB) where the time duration spanned by the sensing slots that are sensed to be idle before a downlink transmission (s) is random. In addition, whenever the channel is found to be busy, the base station will back-off with the defer duration corresponding to the channel access priority class in use. Type 1 procedures are basically used to initiate channel access for most data transmissions.
  • Type 2 downlink channel access procedures are performed by a base station (eNB/gNB) where the time duration spanned by sensing slots that are sensed to be idle before a downlink transmission (s) is deterministic. These are mostly used for data transmission when the channel access has been established a-priori by the same base station or a UE. Such channel access is also permitted for short duration control signaling transmission, such as discovery burst.
  • eNB/gNB base station
  • s downlink transmission
  • the disclosure below relates to various improvements to cellular wireless communications systems.
  • a method for performing a channel access procedure the method performed by a UE utilising unlicensed transmission spectrum and comprising the steps of performing a listen before transmit sensing operation in which power in a plurality of interlaces is detected, comparing the total received power to a first threshold, if the total detected power is below the threshold allowing a transmission, or else if the total detected power is above the threshold calculating the difference in detected power between the highest and lowest power interlaces, and if the difference is above a second threshold allowing the transmission, else if the difference is below the second threshold not allowing the transmission.
  • the UE may apply an offset to the first threshold.
  • the offset may be selected to compensate for a beamforming imbalance between the UE and a relevant base station.
  • the offset may be received from a base station.
  • the offset may be either semi-static or dynamic.
  • the offset may be received in RRC signalling, or in a DCI message.
  • the offset may be UE-specific or cell-specific.
  • a UE configured to perform the methods described herein.
  • a method of communication utilising unlicensed transmission spectrum between a base station and a UE in a cellular network comprising permitting the UE to make transmissions up to a first maximum channel occupancy time to the base station without a listen before transmit procedure; and at the base station performing a directional listen before transmit procedure and scheduling the UE for a transmission up to a second maximum channel occupancy time, wherein the first maximum channel occupancy time is less than the second maximum channel occupancy time.
  • the first maximum channel occupancy time may be valid for a single packet transmission.
  • the first maximum channel occupancy time may be valid for a single RACH transmission.
  • Figure 1 shows selected elements of a cellular communications network
  • the base stations each comprise hardware and software to implement the RAN’s functionality, including communications with the core network and other base stations, carriage of control and data signals between the core network and UEs, and maintaining wireless communications with UEs associated with each base station.
  • the core network comprises hardware and software to implement the network functionality, such as overall network management and control, and routing of calls and data.
  • a Listen Before Transmit (LBT) process for a channel access procedure may utilise either omnidirectional or directional sensing, each of which may present limitations.
  • the number of antennas used for beamforming at the base station is typically much higher than at the UE (e.g. 128 elements per panel at a base station, compared to 4 to 8 elements per panel at a UE) such that base station beams are much narrower than UE beams.
  • a UE performing LBT will thus detect interfering signals from a broader area than will actually be detected at the base station, thereby over-estimating interference.
  • a directional LBT procedure may be improved by enabling the UE to differentiate interference received from intra-system sources and that from other systems such as WiFi/WiGig. Disclosed below are techniques for performing such an “Interference-aware LBT” .
  • the UE can select one or more different interlace (s) with low energy detected on which to transmit.
  • both transmissions can be detected and decoded as the interlaces are orthogonal.
  • Such an approach may be particularly suitable for configured grant transmissions in which the interlace is decided in advance and remains relatively static.
  • the difference is over a threshold then it can be inferred that the detected transmission is an intra-system UE transmission on a certain interlace and the UE is permitted to transmit at step 403 (either on that interlace relying on directional discrimination at the base station, or utilising a different interlace) . However, if the difference is below the threshold it is inferred that the transmission is from a different system and the transmission is not allowed.
  • the method of Figure 4 may be combined with other LBT processes at the base station which may acquire a channel and schedule the UE to transmit.
  • LBT performed at a UE can suffer from beamforming imbalance between a base station and UEs due to the differences in beam width and associated gain. This can lead to an over-pessimistic interference estimation at the UE (due the UE detecting over a wider beam than will be used by the base station to receive transmissions) .
  • This imbalance can be compensated by applying an offset to the energy detection threshold at the UE which estimates the difference in beam imbalance.
  • the base station may transmit the offset to each UE to apply, for example either semi-statically (e.g. in RRC signalling) , or dynamically (e.g. in a DCI transmission) .
  • the offset may be dependent on a range of factors, for example the beam capability of each device, the beams utilised, and the beam topology (distance between UE &base station, angles between beams, and beam widths) .
  • the signal processing functionality of the embodiments of the invention especially the gNB and the UE may be achieved using computing systems or architectures known to those who are skilled in the relevant art.
  • Computing systems such as, a desktop, laptop or notebook computer, hand-held computing device (PDA, cell phone, palmtop, etc. ) , mainframe, server, client, or any other type of special or general purpose computing device as may be desirable or appropriate for a given application or environment can be used.
  • the computing system can include one or more processors which can be implemented using a general or special-purpose processing engine such as, for example, a microprocessor, microcontroller or other control module.
  • the computing system can also include a main memory, such as random access memory (RAM) or other dynamic memory, for storing information and instructions to be executed by a processor. Such a main memory also may be used for storing temporary variables or other intermediate information during execution of instructions to be executed by the processor.
  • the computing system may likewise include a read only memory (ROM) or other static storage device for storing static information and instructions for a processor.
  • ROM read only memory
  • the computing system may also include an information storage system which may include, for example, a media drive and a removable storage interface.
  • the media drive may include a drive or other mechanism to support fixed or removable storage media, such as a hard disk drive, a floppy disk drive, a magnetic tape drive, an optical disk drive, a compact disc (CD) or digital video drive (DVD) (RTM) read or write drive (R or RW) , or other removable or fixed media drive.
  • Storage media may include, for example, a hard disk, floppy disk, magnetic tape, optical disk, CD or DVD, or other fixed or removable medium that is read by and written to by media drive.
  • the storage media may include a computer-readable storage medium having particular computer software or data stored therein.
  • the computing system can also include a communications interface.
  • a communications interface can be used to allow software and data to be transferred between a computing system and external devices.
  • Examples of communications interfaces can include a modem, a network interface (such as an Ethernet or other NIC card) , a communications port (such as for example, a universal serial bus (USB) port) , a PCMCIA slot and card, etc.
  • Software and data transferred via a communications interface are in the form of signals which can be electronic, electromagnetic, and optical or other signals capable of being received by a communications interface medium.
  • the non-transitory computer readable medium may comprise at least one from a group consisting of: a hard disk, a CD-ROM, an optical storage device, a magnetic storage device, a Read Only Memory, a Programmable Read Only Memory, an Erasable Programmable Read Only Memory, EPROM, an Electrically Erasable Programmable Read Only Memory and a Flash memory.
  • the software may be stored in a computer-readable medium and loaded into computing system using, for example, removable storage drive.
  • a control module (in this example, software instructions or executable computer program code) , when executed by the processor in the computer system, causes a processor to perform the functions of the invention as described herein.

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

Abstract

Procédés destinés à l'utilisation d'un spectre de transmission sans licence dans un réseau de communication cellulaire. Des UE sont autorisés à transmettre pendant une courte période, par exemple pour réaliser une transmission RACH, sans avoir recours à procédure « écouter avant de transmettre ». Des stations de base réalisent des procédures « écouter avant de transmettre » bidirectionnelles et planifient des transmissions d'UE dans un spectre de transmission disponible. Des UE peuvent réaliser des procédures « écouter avant de transmettre » et la différence de puissance entre les entrelacements peut être utilisée pour déterminer si un UE est autorisé à transmettre.
PCT/CN2021/100659 2020-06-17 2021-06-17 Détection d'accès à un canal directionnel WO2021254448A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202180043520.9A CN115918239A (zh) 2020-06-17 2021-06-17 定向信道接入的检测

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US202063040257P 2020-06-17 2020-06-17
US63/040,257 2020-06-17

Publications (1)

Publication Number Publication Date
WO2021254448A1 true WO2021254448A1 (fr) 2021-12-23

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CN (1) CN115918239A (fr)
WO (1) WO2021254448A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018080758A1 (fr) * 2016-10-28 2018-05-03 Qualcomm Incorporated Coexistence de transmissions en liaison montante entrelacées et contiguës
US20180352577A1 (en) * 2017-05-30 2018-12-06 Huawei Technologies Co., Ltd. Methods and System for LBT Threshold Setting for Directional Reception and Transmission
CN110120830A (zh) * 2018-02-07 2019-08-13 上海朗帛通信技术有限公司 一种基站、用户设备中的用于无线通信的方法和装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018080758A1 (fr) * 2016-10-28 2018-05-03 Qualcomm Incorporated Coexistence de transmissions en liaison montante entrelacées et contiguës
US20180352577A1 (en) * 2017-05-30 2018-12-06 Huawei Technologies Co., Ltd. Methods and System for LBT Threshold Setting for Directional Reception and Transmission
CN110120830A (zh) * 2018-02-07 2019-08-13 上海朗帛通信技术有限公司 一种基站、用户设备中的用于无线通信的方法和装置

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
INTERDIGITAL INC.: "On LBT for Beam-Based Transmission for NR-U", 3GPP DRAFT; R1-1804885 ON LBT FOR BEAM-BASED TRANSMISSION FOR NR-U, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Sanya, China; 20180416 - 20180420, 15 April 2018 (2018-04-15), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051427148 *
QUALCOMM INCORPORATED: "Potential solutions and techniques for NR unlicensed", 3GPP DRAFT; R1-1802865 7.6.4 POTENTIAL SOLUTIONS AND TECHNIQUES FOR NR UNLICENSED, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Athens, Greece; 20180226 - 20180302, 17 February 2018 (2018-02-17), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051398278 *
ZTE, SANECHIPS: "Discussion on channel access procedure for NR-U", 3GPP DRAFT; R1-1903873 DISCUSSION ON CHANNEL ACCESS PROCEDURE FOR NR-U_FINAL, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Xi’an, China; 20190408 - 20190412, 7 April 2019 (2019-04-07), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051699309 *

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