WO2021028033A1 - Système de radiocommunication - Google Patents

Système de radiocommunication Download PDF

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Publication number
WO2021028033A1
WO2021028033A1 PCT/EP2019/071794 EP2019071794W WO2021028033A1 WO 2021028033 A1 WO2021028033 A1 WO 2021028033A1 EP 2019071794 W EP2019071794 W EP 2019071794W WO 2021028033 A1 WO2021028033 A1 WO 2021028033A1
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WO
WIPO (PCT)
Prior art keywords
sub
band
bands
subset
channel occupancy
Prior art date
Application number
PCT/EP2019/071794
Other languages
English (en)
Inventor
Karol Schober
Claudio Rosa
Timo Erkki Lunttila
Original Assignee
Nokia Technologies Oy
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 Nokia Technologies Oy filed Critical Nokia Technologies Oy
Priority to PCT/EP2019/071794 priority Critical patent/WO2021028033A1/fr
Publication of WO2021028033A1 publication Critical patent/WO2021028033A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information
    • H04W74/006—Transmission of channel access control information in the downlink, i.e. towards the terminal
    • 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0078—Timing of allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]

Definitions

  • the present application relates to a method, apparatus, and computer program.
  • a communication system can be seen as a facility that enables communication sessions between two or more entities such as user terminals, base stations/access points and/or other nodes by providing carriers between the various entities involved in the communications path.
  • a communication system can be provided, for example, by means of a communication network and one or more compatible communication devices.
  • the communication sessions may comprise, for example, communication of data for carrying communications such as voice, electronic mail (email), text message, multimedia and/or content data and so on.
  • Non-limiting examples of services provided comprise two-way or multi-way calls, data communication or multimedia services and access to a data network system, such as the Internet.
  • an apparatus in a network node comprising means for: causing a configuration to be provided, to a user equipment, the configuration defining a first sub-band in a plurality of sub-bands and a first time window, where the user equipment is expected to receive a first signal; acquiring a channel occupancy for transmission in a subset of the plurality of sub-bands, wherein the first time window is at least partially within the channel occupancy; determining that the first sub-band is not within the subset of the plurality of sub-bands; determining a second sub-band that is within the subset of the plurality of sub-bands; and causing a transmission of the first signal to the user equipment in the second sub-band at a time during the channel occupancy.
  • the configuration may define at least one further sub-band in the plurality of sub-bands where the user equipment is expected to receive the first signal, wherein the second sub-band is within the at least one further sub-band and the at least one further sub-band is different than the first sub-band.
  • the first time window may comprise a discovery reference signal time window.
  • the means may be for determining the time during the channel occupancy for transmission of the first signal, wherein the time is within both the first time window and the channel occupancy time.
  • the means may be for causing a configuration to be provided, to the user equipment, of a bandwidth part split into the plurality of sub-bands.
  • the means may be for performing listen-before-talk per sub-band in the plurality of sub-bands in order to acquire the channel occupancy for transmission.
  • the second sub-band may be determined from the subset of the plurality of sub-bands according to a predetermined rule.
  • the predetermined rule may be at least one of: the lowest sub-band index of the subset of the plurality of sub-bands is selected as the second sub-band, or the largest sub-band index of the subset of the plurality of sub-bands is selected as the second sub-band.
  • the time may be determined relatively to the channel occupancy, or determined according to a predetermined location within the first time window, or a combination thereof.
  • the first signal may comprise a discovery reference signal.
  • an apparatus in a user equipment comprising means for: receiving a configuration, from a network node, defining a first sub-band in a plurality of sub-bands and a first time window, where the user equipment is expected to receive a first signal; detecting a channel occupancy in a subset of the plurality of sub-bands which has been acquired by the network node for transmission; determining that the first sub-band is not within the subset of the plurality of sub-bands; determining a second sub-band that is within the subset of the plurality of sub-bands; and receiving the first signal from the network node in the second sub-band at a time during the channel occupancy.
  • the means for detecting may be for detecting a group common physical downlink control channel and/or a wideband demodulation reference signal on another sub-band other than the first sub-band of the plurality of sub-bands.
  • the detecting may be performed by detecting a preamble received from the network node.
  • the means may be for synchronising with the network node using the received first signal.
  • the means may be for, when in idle mode or when performing radio resource management neighbour cell measurements, detecting the channel occupancy at at least one predefined time instance before the first time window.
  • the configuration may define at least one further sub-band in the plurality of sub-bands where the user equipment is expected to receive the first signal, wherein the second sub-band is within the at least one further sub-band and the at least one further sub-band is different than the first sub-band.
  • the first time window may comprise a discovery reference signal time window.
  • the means may be for determining the time during the channel occupancy for reception of the first signal, wherein the time is within both the first time window and the channel occupancy time.
  • the means may be for receiving a configuration, from the network node, of a bandwidth part split into the plurality of sub-bands.
  • the second sub-band may be determined from the subset of the plurality of sub-bands according to a predetermined rule.
  • the predetermined rule may be at least one of: the lowest sub-band index of the subset of the plurality of sub-bands is selected as the second sub-band, or the largest sub-band index of the subset of the plurality of sub-bands is selected as the second sub-band.
  • the time may be determined relatively to the channel occupancy, or determined according to a predetermined location within the first time window, or a combination thereof.
  • the first signal may comprise a discovery reference signal.
  • method comprising: causing a configuration to be provided, to a user equipment, the configuration defining a first sub-band in a plurality of sub-bands and a first time window, where the user equipment is expected to receive a first signal; acquiring a channel occupancy for transmission in a subset of the plurality of sub-bands, wherein the first time window is at least partially within the channel occupancy; determining that the first sub-band is not within the subset of the plurality of sub-bands; determining a second sub-band that is within the subset of the plurality of sub-bands; and causing a transmission of the first signal to the user equipment in the second sub-band at a time during the channel occupancy.
  • the configuration may define at least one further sub-band in the plurality of sub-bands where the user equipment is expected to receive the first signal, wherein the second sub-band is within the at least one further sub-band and the at least one further sub-band is different than the first sub-band.
  • the first time window may comprise a discovery reference signal time window.
  • the method may comprise determining the time during the channel occupancy for transmission of the first signal, wherein the time is within both the first time window and the channel occupancy time.
  • the method may comprise causing a configuration to be provided, to the user equipment, of a bandwidth part split into the plurality of sub-bands.
  • the method may comprise performing listen-before-talk per sub-band in the plurality of sub-bands in order to acquire the channel occupancy for transmission.
  • the second sub-band may be determined from the subset of the plurality of sub-bands according to a predetermined rule.
  • the predetermined rule may be at least one of: the lowest sub-band index of the subset of the plurality of sub-bands is selected as the second sub-band, or the largest sub-band index of the subset of the plurality of sub-bands is selected as the second sub-band.
  • the time may be determined relatively to the channel occupancy, or determined according to a predetermined location within the first time window, or a combination thereof.
  • the first signal may comprise a discovery reference signal.
  • method comprising: receiving a configuration, from a network node, defining a first sub-band in a plurality of sub-bands and a first time window, where the user equipment is expected to receive a first signal; detecting a channel occupancy in a subset of the plurality of sub-bands which has been acquired by the network node for transmission; determining that the first sub band is not within the subset of the plurality of sub-bands; determining a second sub band that is within the subset of the plurality of sub-bands; and receiving the first signal from the network node in the second sub-band at a time during the channel occupancy.
  • the method may comprise detecting may be for detecting a group common physical downlink control channel and/or a wideband demodulation reference signal on another sub-band other than the first sub-band of the plurality of sub-bands.
  • the detecting may be performed by detecting a preamble received from the network node.
  • the method may comprise synchronising with the network node using the received first signal.
  • the method may comprise, when in idle mode or when performing radio resource management neighbour cell measurements, detecting the channel occupancy at at least one predefined time instance before the first time window.
  • the configuration may define at least one further sub-band in the plurality of sub-bands where the user equipment is expected to receive the first signal, wherein the second sub-band is within the at least one further sub-band and the at least one further sub-band is different than the first sub-band.
  • the first time window may comprise a discovery reference signal time window.
  • the method may comprise determining the time during the channel occupancy for reception of the first signal, wherein the time is within both the first time window and the channel occupancy time.
  • the method may comprise receiving a configuration, from the network node, of a bandwidth part split into the plurality of sub-bands.
  • the second sub-band may be determined from the subset of the plurality of sub-bands according to a predetermined rule.
  • the predetermined rule may be at least one of: the lowest sub-band index of the subset of the plurality of sub-bands is selected as the second sub-band, or the largest sub-band index of the subset of the plurality of sub-bands is selected as the second sub-band.
  • the time may be determined relatively to the channel occupancy, or determined according to a predetermined location within the first time window, or a combination thereof.
  • the first signal may comprise a discovery reference signal.
  • an apparatus comprising: at least one processor; and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to perform: causing a configuration to be provided, to a user equipment, the configuration defining a first sub-band in a plurality of sub-bands and a first time window, where the user equipment is expected to receive a first signal; acquiring a channel occupancy for transmission in a subset of the plurality of sub-bands, wherein the first time window is at least partially within the channel occupancy; determining that the first sub-band is not within the subset of the plurality of sub-bands; determining a second sub-band that is within the subset of the plurality of sub-bands; and causing a transmission of the first signal to the user equipment in the second sub-band at a time during the channel occupancy.
  • the configuration may define at least one further sub-band in the plurality of sub-bands where the user equipment is expected to receive the first signal, wherein the second sub-band is within the at least one further sub-band and the at least one further sub-band is different than the first sub-band.
  • the first time window may comprise a discovery reference signal time window.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: determining the time during the channel occupancy for transmission of the first signal, wherein the time is within both the first time window and the channel occupancy time.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: causing a configuration to be provided, to the user equipment, of a bandwidth part split into the plurality of sub-bands.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: performing listen-before-talk per sub-band in the plurality of sub-bands in order to acquire the channel occupancy for transmission.
  • the second sub-band may be determined from the subset of the plurality of sub-bands according to a predetermined rule.
  • the predetermined rule may be at least one of: the lowest sub-band index of the subset of the plurality of sub-bands is selected as the second sub-band, or the largest sub-band index of the subset of the plurality of sub-bands is selected as the second sub-band.
  • the time may be determined relatively to the channel occupancy, or determined according to a predetermined location within the first time window, or a combination thereof.
  • the first signal may comprise a discovery reference signal.
  • an apparatus comprising: at least one processor; and at least one memory including computer program code, the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to perform: receiving a configuration, from a network node, defining a first sub-band in a plurality of sub-bands and a first time window, where the user equipment is expected to receive a first signal; detecting a channel occupancy in a subset of the plurality of sub-bands which has been acquired by the network node for transmission; determining that the first sub-band is not within the subset of the plurality of sub-bands; determining a second sub-band that is within the subset of the plurality of sub-bands; and receiving the first signal from the network node in the second sub-band at a time during the channel occupancy.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: detecting may be for detecting a group common physical downlink control channel and/or a wideband demodulation reference signal on another sub-band other than the first sub band of the plurality of sub-bands.
  • the detecting may be performed by detecting a preamble received from the network node.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: synchronising with the network node using the received first signal.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: when in idle mode or when performing radio resource management neighbour cell measurements, detecting the channel occupancy at at least one predefined time instance before the first time window.
  • the configuration may define at least one further sub-band in the plurality of sub-bands where the user equipment is expected to receive the first signal, wherein the second sub-band is within the at least one further sub-band and the at least one further sub-band is different than the first sub-band.
  • the first time window may comprise a discovery reference signal time window.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: determining the time during the channel occupancy for reception of the first signal, wherein the time is within both the first time window and the channel occupancy time.
  • the at least one memory and the computer program code may be configured to, with the at least one processor, cause the apparatus at least to perform: receiving a configuration, from the network node, of a bandwidth part split into the plurality of sub-bands.
  • the second sub-band may be determined from the subset of the plurality of sub-bands according to a predetermined rule.
  • the predetermined rule may be at least one of: the lowest sub-band index of the subset of the plurality of sub-bands is selected as the second sub-band, or the largest sub-band index of the subset of the plurality of sub-bands is selected as the second sub-band.
  • the time may be determined relatively to the channel occupancy, or determined according to a predetermined location within the first time window, or a combination thereof.
  • the first signal may comprise a discovery reference signal.
  • a non-transitory computer readable medium comprising program instructions thereon for performing at least the following: causing a configuration to be provided, to a user equipment, the configuration defining a first sub-band in a plurality of sub-bands and a first time window, where the user equipment is expected to receive a first signal; acquiring a channel occupancy for transmission in a subset of the plurality of sub-bands, wherein the first time window is at least partially within the channel occupancy; determining that the first sub-band is not within the subset of the plurality of sub-bands; determining a second sub-band that is within the subset of the plurality of sub-bands; and causing a transmission of the first signal to the user equipment in the second sub-band at a time during the channel occupancy.
  • a non-transitory computer readable medium comprising program instructions thereon for performing at least the following: receiving a configuration, from a network node, defining a first sub-band in a plurality of sub-bands and a first time window, where the user equipment is expected to receive a first signal; detecting a channel occupancy in a subset of the plurality of sub-bands which has been acquired by the network node for transmission; determining that the first sub-band is not within the subset of the plurality of sub-bands; determining a second sub-band that is within the subset of the plurality of sub-bands; and receiving the first signal from the network node in the second sub-band at a time during the channel occupancy.
  • a computer product stored on a medium may cause an apparatus to perform the methods as described herein.
  • An electronic device may comprise apparatus as described herein.
  • Figure 1 shows a schematic diagram of an example communication system comprising a plurality of base stations and a plurality of communication devices;
  • Figure 2 shows a schematic diagram of an example communication device;
  • Figure 3 shows a schematic diagram of an example network function;
  • Figure 4 schematically shows example discovery reference signal transmission windows
  • Figure 5 schematically shows an example carrier with multiple synchronisation signal blocks
  • Figure 6 schematically shows example sub-band configurations
  • Figure 7 schematically shows an example operation of a communication system
  • Figure 8 schematically shows another example operation of a communication system
  • Figure 9 shows an example signalling diagram between network entities
  • Figure 10 shows an example method performed by a network node
  • Figure 11 shows an example method performed by a user equipment.
  • a wireless communication system 100 such as that shown in Figure 1, mobile communication devices or user apparatus or user equipment (UE) 102, 104 are provided wireless access via at least one base station or similar wireless transmitting and/or receiving node or point.
  • a user can access the communication system by means of an appropriate communication device or terminal.
  • a communication device of a user may be a user equipment (UE) or a machine type terminal or any other suitable device.
  • a communication device is provided with an appropriate signal receiving and transmitting apparatus for enabling communications, for example enabling access to a communication network or communications directly with other users.
  • the communication device may access a carrier provided by a station or access point, and transmit and/or receive communications on the carrier.
  • the communication system and associated devices typically operate in accordance with a given standard or specification which sets out what the various entities associated with the system are permitted to do and how that should be achieved.
  • a base station may be referred to more generally as simply a network apparatus or a network access point.
  • Base stations are typically controlled by at least one appropriate controller apparatus, so as to enable operation thereof and management of mobile communication devices in communication with the base stations.
  • the controller apparatus may be located in a radio access network (e.g. wireless communication system 100) or in a core network (CN) (not shown) and may be implemented as one central apparatus or its functionality may be distributed over several apparatus.
  • the controller apparatus may be part of the base station and/or provided by a separate entity such as a Radio Network Controller.
  • control apparatus 108 and 109 are shown to control the respective macro level base stations 106 and 107. In some systems, the control apparatus may additionally or alternatively be provided in a radio network controller.
  • base stations 106 and 107 are shown as connected to a wider communications network 113 via a gateway 112.
  • a further gateway function may be provided to connect to another network.
  • base stations or cells There may be smaller base stations or cells (not shown) in some networks. These may be pico or femto level base stations or the like.
  • Such a communication device may be a user equipment (UE) or terminal.
  • An appropriate communication device may be provided by any device capable of sending and receiving radio signals.
  • Non-limiting examples comprise a mobile station (MS) or mobile device such as a mobile phone or what is known as a smart phone, a computer provided with a wireless interface card or other wireless interface facility (e.g., USB dongle), personal data assistant (PDA) or a tablet provided with wireless communication capabilities, a machine type device or any combinations of these or the like.
  • MS mobile station
  • PDA personal data assistant
  • the device 200 may receive signals over an air or radio interface 207 via appropriate apparatus for receiving and may transmit signals via appropriate apparatus for transmitting radio signals.
  • transceiver apparatus is designated schematically by block 206.
  • the transceiver apparatus 206 may be provided for example by means of a radio part and associated antenna arrangement.
  • the antenna arrangement may be arranged internally or externally to the communication device.
  • a device is typically provided with at least one data processing entity 201 , at least one memory 202 and other possible components 203 for use in software and hardware aided execution of tasks it is designed to perform, including control of access to and communications with access systems and other communication devices.
  • the data processing, storage and other relevant control apparatus can be provided on an appropriate circuit board and/or in chipsets. This feature is denoted by reference 204.
  • the user may control the operation of the mobile device by means of a suitable user interface such as key pad 205, voice commands, touch sensitive screen or pad, combinations thereof or the like. This may be optional in some embodiments.
  • a suitable user interface such as key pad 205, voice commands, touch sensitive screen or pad, combinations thereof or the like. This may be optional in some embodiments.
  • a display 208, a speaker and a microphone can be also provided. One or more of these may be optional in some embodiments.
  • a communication device may comprise appropriate connectors (either wired or wireless) to other devices and/or for connecting external accessories, for example hands-free equipment, thereto. One or more of these may be optional.
  • the communication devices may access the communication system based on various access techniques.
  • wireless communication systems are architectures standardized by the 3rd Generation Partnership Project (3GPP).
  • 3GPP 3rd Generation Partnership Project
  • 5G New Radio
  • NR New Radio
  • the previous 3GPP based developments are often referred to as different generations for example 2G, 3G, 4G.
  • Other examples of radio access system comprise those provided by base stations of systems that are based on technologies such as wireless local area network (WLAN) and/or WiMAX (Worldwide Interoperability for Microwave Access).
  • WLAN wireless local area network
  • WiMAX Worldwide Interoperability for Microwave Access
  • Figure 3 shows an apparatus that could be comprised within a network function.
  • the network function could be a base station (gNB, eNB, etc.), a management function, a serving gateway, a packet data network gateway, an access and mobility management function or a session management function.
  • the apparatus 300 comprises at least one memory 301 , at least one data processing unit 302, 303 and an input/output interface 304.
  • the apparatus 300 can be configured to execute an appropriate software code to provide functions.
  • the apparatus 300 may be included in a chipset apparatus.
  • Some of the example embodiments as shown below may be applicable to 3GPP 5G standards. However, some example embodiments may also be applicable to 4G, 3G and other 3GPP standards.
  • Some example embodiments relate to NR unlicensed (NR-U).
  • Some examples aim to improve (gNB) channel access for the transmission of discovery reference signals (DRS) in conditions where DRS and the corresponding synchronisation signal blocks (SSB) are to be transmitted on a sub-band which is not one of the sub-bands the gNB has gained access to and is currently transmitting on.
  • the DRS is a set of signals that may comprise at least a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a channel state information reference signal (CSI-RS).
  • DRS transmission is utilized in licensed assisted access (LAA) for cell detection, synchronization, and radio resource management (RRM) measurement.
  • LAA licensed assisted access
  • RRM radio resource management
  • LAA Licensed-Assisted Access
  • LBT is a technique in radio communications wherein radio transmitters first monitor or sense the radio environment before the radio transmitter starts a transmission. LBT can be used by a radio device to find a free radio channel to operate on.
  • the channel access schemes for NR-based access for unlicensed spectrum can be classified into the following categories:
  • COT channel occupancy time
  • the switching gap from reception to transmission is to accommodate the transceiver turnaround time and is no longer than 16 ps.
  • the duration of time that the channel is sensed to be idle before the transmitting entity transmits is deterministic.
  • the LBT procedure has the following procedure as one of its components.
  • the transmitting entity draws a random number N within a contention window.
  • the size of the contention window is specified by the minimum and maximum value of N.
  • the size of the contention window is fixed.
  • the random number N is used in the LBT procedure to determine the duration of time that the channel is sensed to be idle before the transmitting entity transmits on the channel.
  • the LBT procedure has the following as one of its components.
  • the transmitting entity draws a random number N within a contention window.
  • the size of contention window is specified by the minimum and maximum value of N.
  • the transmitting entity can vary the size of the contention window when drawing the random number N.
  • the random number N is used in the LBT procedure to determine the duration of time that the channel is sensed to be idle before the transmitting entity transmits on the channel.
  • FIG. 4 shows two back-to-back half-frame DRS transmission windows 401 , 403.
  • the DRS transmission windows 401 , 403 may also be referred to as DRS time windows.
  • the DRS transmission windows 401, 403 of 5ms comprises 20 SSB candidate positions 405, i.e. half-slots.
  • the subcarrier spacing in this example is 30 kFIz, and the corresponding slot duration is 0.5 ms.
  • the two back-to-back half-frame DRS transmission windows 401, 403, are consecutive in time.
  • the half-frame DRS transmission windows may repeat with a periodicity of 20 ms or higher.
  • the half-frame DRS transmission windows 401 , 403, may be separated by at least 15 ms (see for example Figure 7).
  • the DRS transmission window 401, 403 may comprise a discovery measurement timing configuration (DMTC).
  • the DRS transmission window 401, 403 may comprise a synchronisation signal physical broadcast channels (SS/PBCFI) block measurement time configuration (SMTC).
  • the DRS transmission window 401, 403 may comprise a measurement timing configuration.
  • a base station attempts to transmit the SSBs.
  • ‘X’ denotes that the channel was occupied in certain SSB candidate positions (i.e. LBT is not successful), hence, preventing SSB transmission.
  • the SSB candidate position before which the LBT is successful is different for the first DRS transmission window 401 (LBT successful before SSB candidate position 4) and the second DRS transmission window 403 (LBT successful before SSB candidate position 3).
  • the SSB for beam # 0 is transmitted first 407, followed by beam #1, #2, and #3.
  • beam # 3 is transmitted first 409, followed by beam #0, #1, and #2.
  • the transmission of 4 beams requires 1ms.
  • Figure 5 shows wideband operation in NR in an example where there are multiple SSBs within a network carrier.
  • Figure 5 shows both cell defining SSBs (CD- SSBs) and non-cell defining SSBs (NCD-SSBs), in a wideband network carrier.
  • CD-SSBs cell defining SSBs
  • NCD-SSBs non-cell defining SSBs
  • Figure 5 shows a first UE 505 and a second UE 507. From the UE perspective, a serving cell is associated to a single SSB.
  • NCD-SSBs SSB2509 and SSB3511 , which are both also on the same carrier.
  • the NCD-SSBs 509, 511 indicate (for initial access UE) where the UE 505, 507 may find the cell defining SSB.
  • Radio resource management (RRM) measurements based on both CD-SSBs 501 , 503 and NCD-SSBs 509, 511 can be configured.
  • NR-U supports wideband operation where the base station can configure a
  • the base station could configure an 80MFIz BWP comprising 4 LBT sub-bands, such that an LBT sub-band is 20 MHz.
  • Figure 6 labels these 4 sub-bands ‘a’, ‘b’, ‘c’ and ‘d’. Therefore, the base station could perform LBT per 20 MHz sub-band and then transmit a downlink burst on a sub-set of sub-bands given the LBT outcome.
  • the example shown in Figure 6 assumes that transmission is allowed on contiguous sub-bands, and not non contiguous sub-bands. However, in other examples, transmission is allowed on non contiguous sub-bands as well.
  • a transmission may occur on the corresponding sub-band as shown by label 601. If the LBT outcome is positive in 2 sub-bands, then transmission may occur on the corresponding 2 sub-bands as shown by label 603. If the LBT outcome is positive in 3 sub-bands, then transmission may occur on the corresponding 3 sub-bands as shown by label 605. If the LBT outcome is positive on 4 sub-bands then transmission may occur in sub-bands ‘a’, ‘b’, ‘c’ and ‘d’ as shown by label 607. However, in some situations, periodic DRS (including SSB burst) transmission may be due on a sub-band (e.g.
  • sub-band #X sub-band #X
  • the base station has acquired a COT for a separate sub-band (e.g. sub-band #Y).
  • a base station cannot perform LBT on one sub-band while transmitting on a separate sub-band.
  • a base station may not be able to transmit and receive at the same time if there is not enough frequency separation between the sub-bands. Accordingly, in this situation, stopping a downlink (DL) transmission to perform a CAT2 channel access scheme for sub-band #X may not be desirable, because there is no guarantee that a CAT2 LBT on sub-band #X will be successful, and the base station may lose the right to transmit on sub-band #Y.
  • DL downlink
  • Figure 7 shows an example of operation of a communication system.
  • the UE in this example may be in RRC connected mode.
  • Figure 7 shows a time period with 30 time slots, from slot #0 to slot #29.
  • a base station could have configured an 80MHz BWP comprising 4 LBT sub-bands, such that an LBT sub-band is 20 MHz. In other examples, there may be less than 4 sub-bands, or more than 4 sub-bands.
  • Figure 7 shows two DRS time windows, a first DRS window 701 and a second DRS window 703.
  • the DRS window represents a range in time where the UE may expect to receive a DRS/SSB.
  • the DRS window 701 , 703 is 5 time slots wide. In other examples, the DRS window 701 , 702 may be less than 5 time slots, or more than 5 time slots.
  • the first DRS window 701 is from slot #0 to slot #4.
  • the second DRS window 703 is from slot #20 to slot #24. Therefore, the example of Figure 7 shows a DRS window periodicity of 20ms if a time slot represents 1 ms.
  • Figure 7 shows that in slot #1 of sub-band #3 the UE receives a first DRS 704.
  • Slot #1 is the second time slot of the first DRS window 701.
  • the channel access scheme, performed at the base station, for this transmission of the first DRS 705 may be CAT 2, as described earlier.
  • the DRS transmission window 701,703 within sub- band #3 may be referred to as the primary SSB 705.
  • the UE may be configured, by a base station, with the primary SSB 705.
  • the primary SSB 705 indicates on which sub band and in which set of time slots making up the DRS window the UE may expect to receive a DRS from the base station. Therefore, for the second DRS window 703 the primary SSB 706 is one of the slots in slots #20 to #24 of sub-band #3.
  • the time slots in the DRS window will be selected if that time slot has a clear channel.
  • the base station acquires a COT 707 on sub bands #0 and #1.
  • the channel access scheme for this COT transmission from the base station may be CAT 4, as described earlier.
  • the COT 707 spans sub- band #0 and sub-band #1 for time slots #19 to #25.
  • all of the primary SSB 706 locations in slots #20 to #24 of the second DRS transmission window 703 remain located in sub-band #3 instead.
  • the UE detects the COT 707 in slot #19.
  • the UE may detect the COT 707 based on, for example, a group common physical downlink control channel (GC-PDCCH) and/or a wideband demodulation reference signal (WB-DMRS).
  • GC-PDCCH group common physical downlink control channel
  • WB-DMRS wideband demodulation reference signal
  • the GC-PDCCH may be scrambled by a known radio network temporary identifier (RNTI).
  • RNTI radio network temporary identifier
  • other suitable detection techniques are used by the UE.
  • the UE may determine which of the sub-bands and which of the slots of the COT 707 the DRS will arrive according to a predetermined rule.
  • the predetermine rule may be, for example, the largest sub-band index (i.e. sub-band #1 ) and the n-th valid time slot of the DRS window starting from m slots after the COT has been detected. Alternatively, it may be a predetermined slot of the DRS window, such as the last slot of the DRS window. It should be understood that these examples of predetermined rules are given as examples only and other suitable predetermined rules may be used by the UE. The steps performed by the UE of Figure 7 will now be described in more detail below.
  • the UE may first take part in an RRC connection procedure with a network. Once connected, the UE may be configured with at least two DRS/SSB locations in frequency and/or time within the DRS window 701, 703.
  • the at least two DRS/SSB locations may comprise a primary SSB 705, 706, in frequency and a secondary SSB 709 in frequency.
  • the time location candidates, valid time slots of the DRS transmission window, are the same for both the primary SSB 705, 706 and secondary SSB 709 in this example.
  • the secondary SSB 709 may be made up of one or more suitable sub-bands with suitable time slots being the time slots of the second DRS transmission window 703. Therefore, one SSB is the primary SSB location 705, 706, while the remaining SSBs are the secondary SSB 709.
  • the RRC connected UE will expect to receive a DRS/SSB at a location within the primary SSB 705, 706, unless within a predetermined time ahead of the DRS window 701, 703 the UE detects WB-DMRS and/or GC-PDCCH on another sub- band(s) (i.e. other than the primary sub-band).
  • the detection of WB-DMRS and/or GC- PDCCH on another sub-band indicates COT in time and frequency, such that the indicated channel occupancy time overlaps in time with the DRS window at the primary location
  • the UE attempts to detect the DRS/SSB on one of the time slots and on one of the sub-bands within the secondary SSB 709, based on the COT and according to predetermined rules.
  • the predetermined rule may be, for example, that the largest sub-band index of the COT is used as the secondary SSB location 709. In another example the predetermined rule may be that the lowest sub-band index of the COT is used the secondary SSB location 709.
  • the time location may be determined, for example, as the 1 st valid slot of the DRS window starting from 2 slots after the slot where COT start has been detected.
  • the network may pre-configure the UE with the predetermined rule.
  • the UE receives a second DRS 711 within the secondary SSB 709.
  • the second DRS 711 is found within the time and frequency of the COT 707.
  • the second DRS 711 is in the second time slot of the second DRS window 703 (i.e. slot #21) and in sub-band #1.
  • the second DRS 711 could be received by the UE in any time slot of the second DRS window 703, and any sub-band in which the COT has acquired access to.
  • the UE may not be required to read system information, for example physical broadcast channels (PBCH)/system information blocks (SIBs), from the secondary DRS upon receiving system update by paging in an RRC connected state, but may acquire synchronization.
  • the UE may use the received DRS to remain synchronised with the base station.
  • the UE may not be required to read system information if for example, the base station operates with multiple overlapping cells, and the secondary SSB of one cell overlaps with primary SSB of another cell with a different cell ID.
  • Figure 8 shows another example operation of a UE.
  • the UE in this example may be in idle mode or performing RRM measurements.
  • Figure 8 shows a time period with 22 time slots labelled slot #13 to slot #34.
  • Figure 8 shows a DRS window 801.
  • the DRS window 801 is 5 time slots wide.
  • the DRS window 801 may be less than 5 time slots, or more than 5 time slots.
  • the DRS window 801 ranges from slot #25 to slot #29.
  • Figure 8 illustrates a UE camping on a cell.
  • the UE camping on the cell/ performing RRM measurements does not typically perform physical downlink control channel (PDCCH) monitoring.
  • PDCCH physical downlink control channel
  • the UE wakes up early to detect WB-DMRS and/or GC-PDCCH.
  • the detection of WB-DMRS and/or GC-PDCCH indicates a COT 803 acquired by a base station in time and frequency.
  • the detecting of the WB-DMRS and/or GC-PDCCH provides knowledge for the UE of the sub-bands acquired by the base station for transmission. Based on the outcome of the detection, the UE determines on which sub-band to attempt detection of the DRS transmission from the base station according to rules discussed above in relation to Figure 7.
  • the COT 707 spans sub-band #0 and sub-band #1 for time slots #23 to #29.
  • the UE may be configured, by a base station, with a primary SSB 805.
  • the primary SSB 805 indicates on which sub-band and which time slots the UE is expecting to receive the DRS 807 from the base station.
  • the primary SSB 805 is one of the slots in slots #25 to #29 in sub-band #3.
  • the time slot in the DRS window 801 may be selected by gNB if the slot has a clear channel. These numbers are given as an example only and any suitable slot or sub-band could be used as the primary SSB 805. However, as the UE has detected the COT 803, the UE will attempt to detect the DRS 807 from a time and frequency within the COT 803. In Figure 8, the UE attempts to detect the DRS 807 in sub-band #1 rather than sub-band #3, as sub band #1 is within the COT 803, which is known as the secondary SSB 807. The time slot where the UE attempts to detect the DRS 807 is determined according to predetermined rules discussed above.
  • the UE receives the DRS 807 in slot #25.
  • the UE may be configured with a subset of sub-bands which are eligible for secondary location of DRS detection.
  • the UE may select one of the subset of sub-band based on a predetermined rule.
  • the predetermined rule may be that the largest sub-band index of the COT is used as the secondary SSB location 807. In another example the predetermined rule may be that the lowest sub-band index of the COT is used the secondary SSB location 807. In an example, the secondary SSB position 807 (in time) within the sub-band would be the same as on the primary SSB 805.
  • the secondary SSB position 807 (in time) within the sub-band would be different compared to the primary SSB 805.
  • the RNTI of GC-PDCCH or sequence initialization of PDCCH wide-band DMRS may be configured by ‘MeasObjectNR’ information element of abstract syntax notation one (ASN.1 ) in TS 38.331.
  • Figure 9 shows an example signalling diagram between network entities.
  • the communications of Figure 9 take place between a network node, such as for example, a base station 901 , and a user device, such as for example, a user equipment (UE) 903.
  • a network node such as for example, a base station 901
  • a user device such as for example, a user equipment (UE) 903.
  • UE user equipment
  • the base station 901 configures a bandwidth part (BWP) that has a plurality of sub-bands.
  • BWP bandwidth part
  • the base station 901 may configure an 80MFIz BWP comprising 4 LBT sub-bands, of 20MFIz per LBT sub-band.
  • the base station 901 may configure the user equipment 903 with the BWP with the plurality of sub bands. It should be understood that these values are used as an example only to aid with the understanding of the disclosure and other suitable bandwidth and sub-band values may be used.
  • the base station 901 transmits a configuration to the user equipment 903.
  • the configuration may define a primary SSB location in time and/or frequency.
  • the configuration may also define one or more secondary SSB locations in time and/or frequency.
  • the primary SSB location and secondary SSB locations may be used by the UE 903 to know when to expect reception of a DRS.
  • the primary SSB location and the one or more secondary SSB locations are found within a DRS window.
  • the DRS window is a set of one or more time slots wherein DRS reception is expected by the UE 903.
  • the base station 901 acquires a channel occupancy time (COT) on a subset of sub-bands.
  • the COT may represent a time and/or frequency whereby the base station 901 can perform transmission based on CAT4 LBT.
  • the COT acquired may be similar to the COTs 707, 803 shown in Figures 7 and 8.
  • the base station 901 may determine that a DRS, due to be transmitted in the primary SSB, is due to be transmitted on a sub-band not part of the COT subset of sub-bands.
  • the UE 903 may detect the COT of the base station.
  • the UE may detect the COT based on GC-PDCCH and/or WB-DMRS.
  • the UE 903 may detect a preamble from the base station 901 which indicates the COT.
  • the UE may use other suitable methods to detect the COT.
  • the UE may know the one or more time slots and the one or more sub-bands of the COT that the base station 901 has acquired. Using this information, the UE can determine whether or not the primary SSB is within the time and/or frequency of the COT.
  • the base station 901 determines one of the one or more secondary SSB locations for DRS transmission based on the acquired COT.
  • the selected secondary SSB will be within the time and/or frequency of the acquired COT. If there are more than one suitable locations for the secondary SSB based on the acquired COT then the selection may be made using a predetermined rule.
  • the predetermined rule may be that the largest sub-band index of the COT is used as the secondary SSB location. In another example the predetermined rule may be that the lowest sub-band index of the COT is used the secondary SSB location.
  • the DRS may be expected by the UE 903 in the n-th valid DRS slot of DRS window starting from m slots after the COT has been detected.
  • the base station may pre configure the UE 903 with the predetermined rule as part of the configuration of step 1.
  • the UE 903 determines one of the one or more secondary SSB locations for DRS reception based on the detected COT.
  • the COT may span a first sub-band and a second sub-band, however, the primary SSB was for a third sub-band.
  • the UE determines that the sub-band of the primary SSB is not within the COT, the UE must determine whether the first or second sub-band should be used as the selected secondary SSB location for reception of the DRS from the base station.
  • the selected secondary SSB will be within the time and/or frequency of the detected COT. If there are more than one suitable locations for the secondary SSB based on the acquired COT then the selection may be made using the predetermined rule as discussed above.
  • the base station 901 transmits the DRS in the selected secondary SSB time and/or frequency location.
  • the UE 903 will receive the DRS in the determined secondary SSB time and/or frequency location.
  • the UE 903 may use the received DRS to acquire synchronisation with the base station 901 /network.
  • the steps shown above may be performed in a different order. In some examples, one or more steps may be removed.
  • an idle UE or UE performing RRM measurements will have the additional step of waking up before step 5, and detecting the COT.
  • An idle UE may wake up one or more slots ahead of a DRS window in order to attempt to detect a COT.
  • the present disclosure means that the DRS can still be transmitted to the UE using the same sub-band as is already being used to transmit in the COT.
  • the UE may better maintain the synchronisation with the base station, resulting in a better performance of the system.
  • an idle UE may be able to access system information more quickly by determining the location of a DRS on secondary SSBs.
  • Step 1001 comprises causing a configuration to be provided, to a user equipment, the configuration defining a first sub-band in a plurality of sub-bands and a first time window, where the user equipment is expected to receive a first signal.
  • Step 1003 comprises acquiring a channel occupancy for transmission in a subset of the plurality of sub-bands, wherein the first time window is at least partially within the channel occupancy.
  • Step 1005 comprises determining that the first sub-band is not within the subset of the plurality of sub-bands.
  • Step 1007 comprises determining a second sub-band that is within the subset of the plurality of sub-bands.
  • Step 1009 comprises causing a transmission of the first signal to the user equipment in the second sub-band at a time during the channel occupancy.
  • the method steps may be performed by an apparatus.
  • the apparatus may be comprised within a network node such as a base station, for example, a gNB or an eNB. In other examples, the network node may be within the apparatus.
  • a network node such as a base station, for example, a gNB or an eNB.
  • the network node may be within the apparatus.
  • Each method step may be performed by a different part or component of the apparatus.
  • the method steps may be performed by an apparatus, such as a chipset or 1C, within the base station. It must be understood that one or more steps may be omitted or take place in an alternate order.
  • Figure 11 shows an example method performed by a user equipment.
  • Step 1101 comprises receiving a configuration, from a network node, defining a first sub-band in a plurality of sub-bands and a first time window, where the user equipment is expected to receive a first signal.
  • Step 1103 comprises detecting a channel occupancy in a subset of the plurality of sub-bands which has been acquired by the network node for transmission.
  • Step 1105 comprises determining that the first sub-band is not within the subset of the plurality of sub-bands.
  • Step 1107 comprises determining a second sub-band that is within the subset of the plurality of sub-bands.
  • Step 11109 comprises receiving the first signal from the network node in the second sub-band at a time during the channel occupancy.
  • the method steps may be performed by an apparatus.
  • the apparatus may be comprised within a user device, such as a UE.
  • the UE may be within the apparatus.
  • Each method step may be performed by a different part or component of the UE.
  • the method steps may be performed by an apparatus, such as chipset or IC, within the UE. It must be understood that one or more steps may be omitted or take place in an alternate order.
  • apparatuses may comprise or be coupled to other units or modules. Although the apparatuses have been described as one entity, different modules and memory may be implemented in one or more physical or logical entities. In general, the various embodiments may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects of the invention may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device, although the invention is not limited thereto.
  • the embodiments of this invention may be implemented by computer software executable by a data processor, such as in the processor entity, or by hardware, or by a combination of software and hardware.
  • Computer software or program also called program product, including software routines, applets and/or macros, may be stored in any apparatus-readable data storage medium and they comprise program instructions to perform particular tasks.
  • a computer program product may comprise one or more computer-executable components which, when the program is run, are configured to carry out embodiments.
  • the one or more computer-executable components may be at least one software code or portions of it.
  • any steps in the signalling diagrams as in the Figures may represent program steps, or interconnected logic circuits, blocks and functions, or a combination of program steps and logic circuits, blocks and functions.
  • the software may be stored on such physical media as memory chips, or memory blocks implemented within the processor, magnetic media such as hard disk or floppy disks, and optical media such as for example DVD and the data variants thereof, CD.
  • the physical media is a non-transitory media.
  • the memory may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory.
  • the data processors may be of any type suitable to the local technical environment, and may comprise one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs), application specific integrated circuits (ASIC), FPGA, gate level circuits and processors based on multi core processor architecture, as non-limiting examples.
  • Embodiments of the inventions may be practiced in various components such as integrated circuit modules.
  • the design of integrated circuits is by and large a highly automated process.
  • Complex and powerful software tools are available for converting a logic level design into a semiconductor circuit design ready to be etched and formed on a semiconductor substrate.

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Abstract

Selon la présente invention, un appareil dans un nœud de réseau comprend des moyens pour amener la fourniture d'une configuration à un équipement utilisateur, la configuration définissant une première sous-bande dans une pluralité de sous-bandes et une première fenêtre temporelle, l'équipement utilisateur étant prévu pour recevoir un premier signal, acquérir une occupation de canal pour une émission dans un sous-ensemble de la pluralité de sous-bandes, la première fenêtre temporelle étant au moins partiellement à l'intérieur de l'occupation de canal, et déterminer que la première sous-bande n'est pas à l'intérieur du sous-ensemble de la pluralité de sous-bandes. L'appareil comprend également des moyens pour déterminer une seconde sous-bande qui se trouve à l'intérieur du sous-ensemble de la pluralité de sous-bandes, et à provoquer une émission du premier signal à l'équipement utilisateur dans la seconde sous-bande à un moment pendant l'occupation de canal.
PCT/EP2019/071794 2019-08-14 2019-08-14 Système de radiocommunication WO2021028033A1 (fr)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023054686A1 (fr) * 2021-09-30 2023-04-06 株式会社デンソー Terminal, station de base, et procédé de communication sans fil
WO2023185901A1 (fr) * 2022-03-30 2023-10-05 维沃移动通信有限公司 Procédé et dispositif de traitement de ressources, et terminal
WO2023221130A1 (fr) * 2022-05-20 2023-11-23 北京小米移动软件有限公司 Procédé et appareil de mesure, dispositif, et support de stockage

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US20190044676A1 (en) * 2017-08-02 2019-02-07 Telefonaktieboaget Lm Ericsson (Publ) Method, Base Station and User Equipment for Transmission

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023054686A1 (fr) * 2021-09-30 2023-04-06 株式会社デンソー Terminal, station de base, et procédé de communication sans fil
WO2023185901A1 (fr) * 2022-03-30 2023-10-05 维沃移动通信有限公司 Procédé et dispositif de traitement de ressources, et terminal
WO2023221130A1 (fr) * 2022-05-20 2023-11-23 北京小米移动软件有限公司 Procédé et appareil de mesure, dispositif, et support de stockage

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