WO2022205280A1 - Procédés, dispositifs, et support lisible par ordinateur de communication - Google Patents

Procédés, dispositifs, et support lisible par ordinateur de communication Download PDF

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Publication number
WO2022205280A1
WO2022205280A1 PCT/CN2021/084854 CN2021084854W WO2022205280A1 WO 2022205280 A1 WO2022205280 A1 WO 2022205280A1 CN 2021084854 W CN2021084854 W CN 2021084854W WO 2022205280 A1 WO2022205280 A1 WO 2022205280A1
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WIPO (PCT)
Prior art keywords
ssbs
subset
candidate
configuration
determining
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PCT/CN2021/084854
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English (en)
Inventor
Gang Wang
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Nec Corporation
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Priority to PCT/CN2021/084854 priority Critical patent/WO2022205280A1/fr
Priority to JP2023560827A priority patent/JP2024511678A/ja
Publication of WO2022205280A1 publication Critical patent/WO2022205280A1/fr

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    • 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
    • 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
    • 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
    • H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
    • 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

Definitions

  • Embodiments of the present disclosure generally relate to the field of telecommunication, and in particular, to methods, devices, and computer readable medium for communication.
  • NR new radio
  • 5G radio access An example of a communication standard is new radio (NR) , for example, 5G radio access.
  • NR is a set of enhancements to the Long Term Evolution (LTE) mobile standard promulgated by Third Generation Partnership Project (3GPP) . It 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. Further, unlicensed band operations have also been studied and applied in 3GPP. Due to the improvements of NR with respect to LTE, issues regarding NR-U transmission also need to be specified.
  • LTE Long Term Evolution
  • 3GPP Third Generation Partnership Project
  • example embodiments of the present disclosure provide a solution for communication.
  • a method for communication comprises receiving, at a terminal device, a master information block (MIB) from a network device, the MIB at least indicating a configuration of a discovery burst transmission window (DBTW) for a plurality of synchronization signal/physical broadcast channel (SS/PBCH) blocks (SSBs) ; determining, based on the configuration, a pattern for a SSB transmission; and receiving, from the network device, at least one SSB in the plurality of SSBs from the network device based on the pattern.
  • MIB master information block
  • DBTW discovery burst transmission window
  • SS/PBCH synchronization signal/physical broadcast channel
  • a method for communication comprises determining, at a network device, a configuration of a discovery burst transmission window (DBTW) for a plurality of synchronization signal/physical broadcast channel (SS/PBCH) blocks (SSBs) ; transmitting, to a terminal device, a master information block (MIB) at least indicating the configuration; and transmitting, to the terminal device, at least one SSB in the plurality of SSBs based on the configuration.
  • DBTW discovery burst transmission window
  • MIB master information block
  • a terminal device comprising a processing unit; and a memory coupled to the processing unit and storing instructions thereon, the instructions, when executed by the processing unit, causing the terminal device to perform method according the first aspect.
  • a network device comprising a processing unit; and a memory coupled to the processing unit and storing instructions thereon, the instructions, when executed by the processing unit, causing the network device to perform method according the second aspect.
  • a computer readable medium having instructions stored thereon, the instructions, when executed on at least one processor, causing the at least one processor to carry out the method according to any one of the first or second aspect.
  • Fig. 1 is a schematic diagram of a communication environment in which embodiments of the present disclosure can be implemented
  • Fig. 2 illustrates a signaling flow for determining a configuration of a discovery burst transmission window (DBTW) according to some embodiments of the present disclosure
  • Fig. 3 is a flowchart of an example method for determining a configuration of a DBTW according to some embodiments of the present disclosure
  • Fig. 4 illustrates a schematic diagram of an iteration procedure according to some embodiments of the present disclosure
  • Fig. 5 illustrates a schematic diagram of a configuration of a DBTW according to some embodiments of the present disclosure
  • Fig. 6 illustrates a schematic diagram of a configuration of a DBTW according to some embodiments of the present disclosure
  • Fig. 7 illustrates a schematic diagram of a configuration of a DBTW according to some embodiments of the present disclosure
  • Fig. 8 is a flowchart of an example method for determining a transmission window according to some embodiments of the present disclosure
  • Fig. 9 is a flowchart of an example method for determining a transmission window according to some embodiments of the present disclosure.
  • Fig. 10 is a simplified block diagram of a device that is suitable for implementing embodiments of the present disclosure.
  • the term “network device” refers to a device which is capable of providing or hosting a cell or coverage where terminal devices can communicate.
  • a network device include, but not limited to, a Node B (NodeB or NB) , an Evolved NodeB (eNodeB or eNB) , a NodeB in new radio access (gNB) a Remote Radio Unit (RRU) , a radio head (RH) , a remote radio head (RRH) , a low power node such as a femto node, a pico node, a satellite network device, an aircraft network device, and the like.
  • NodeB Node B
  • eNodeB or eNB Evolved NodeB
  • gNB NodeB in new radio access
  • RRU Remote Radio Unit
  • RH radio head
  • RRH remote radio head
  • a low power node such as a femto node, a pico node, a satellite network
  • terminal device refers to any device having wireless or wired communication capabilities.
  • Examples of the terminal device include, but not limited to, user equipment (UE) , personal computers, desktops, mobile phones, cellular phones, smart phones, personal digital assistants (PDAs) , portable computers, tablets, wearable devices, internet of things (IoT) devices, Internet of Everything (IoE) devices, machine type communication (MTC) devices, device on vehicle for V2X communication where X means pedestrian, vehicle, or infrastructure/network, or image capture devices such as digital cameras, gaming devices, music storage and playback appliances, or Internet appliances enabling wireless or wired Internet access and browsing and the like.
  • UE user equipment
  • the terminal device may be connected with a first network device and a second network device.
  • One of the first network device and the second network device may be a master node and the other one may be a secondary node.
  • the first network device and the second network device may use different radio access technologies (RATs) .
  • the first network device may be a first RAT device and the second network device may be a second RAT device.
  • the first RAT device is eNB and the second RAT device is gNB.
  • Information related with different RATs may be transmitted to the terminal device from at least one of the first network device and the second network device.
  • first information may be transmitted to the terminal device from the first network device and a second information may be transmitted to the terminal device from the second network device directly or via the first network device.
  • information related with configuration for the terminal device configured by the second network device may be transmitted from the second network device via the first network device.
  • Information related with reconfiguration for the terminal device configured by the second network device may be transmitted to the terminal device from the second network device directly or via the first network device.
  • Communications discussed herein may use conform to any suitable standards including, but not limited to, New Radio Access (NR) , Long Term Evolution (LTE) , LTE-Evolution, LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , Code Division Multiple Access (CDMA) , cdma2000, and Global System for Mobile Communications (GSM) and the like.
  • NR New Radio Access
  • LTE Long Term Evolution
  • LTE-Evolution LTE-Advanced
  • LTE-A LTE-Advanced
  • WCDMA Wideband Code Division Multiple Access
  • CDMA Code Division Multiple Access
  • GSM Global System for Mobile Communications
  • Examples of the communication protocols include, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.85G, the third generation (3G) , the fourth generation (4G) , 4.5G, the fifth generation (5G) , and the sixth (6G) communication protocols.
  • the techniques described herein may be used for the wireless networks and radio technologies mentioned above as well as other wireless networks and radio technologies.
  • circuitry used herein may refer to hardware circuits and/or combinations of hardware circuits and software.
  • the circuitry may be a combination of analog and/or digital hardware circuits with software/firmware.
  • the circuitry may be any portions of hardware processors with software including digital signal processor (s) , software, and memory (ies) that work together to cause an apparatus, such as a terminal device or a network device, to perform various functions.
  • the circuitry may be hardware circuits and or processors, such as a microprocessor or a portion of a microprocessor, that requires software/firmware for operation, but the software may not be present when it is not needed for operation.
  • the term circuitry also covers an implementation of merely a hardware circuit or processor (s) or a portion of a hardware circuit or processor (s) and its (or their) accompanying software and/or firmware.
  • values, procedures, or apparatus are referred to as “best, ” “lowest, ” “highest, ” “minimum, ” “maximum, ” or the like. It will be appreciated that such descriptions are intended to indicate that a selection among many used functional alternatives can be made, and such selections need not be better, smaller, higher, or otherwise preferable to other selections.
  • the term “unlicensed spectrum band” used herein can refer to a band which can be used without getting permission.
  • the term “shared spectrum channel” used herein can refer to a channel which is shared by multiple users.
  • the unlicensed spectrum band can be a shared spectrum channel.
  • Spectrum sharing is an opportunity to open up access to new spectrum for mobile services but needs careful planning to succeed. Spectrum sharing can help address rising demand for mobile services by opening up access to vital new spectrum in areas where it is in-demand and where it is under-used by incumbent users.
  • technologies called “listen before talk (LBT) ” and “clear channel assessment (CCA) ” have been introduced.
  • listen before talk used herein can refer to a technique used in a radio communication where a transmitter first senses a channel for an interval to determine whether the channel is free before proceeding with the transmission.
  • CCA used herein can refer to a technique that involves listening for radio frequency transmissions at the physical layer.
  • Frequency band from 52.6 GHz to 71 GHz has been achieved.
  • the NR operation above 52.6 GHz to 71 GHz considering both licensed and unlicensed operations can be achieved by leveraging Frequency Range 2 (FR2) design to extent possible.
  • FR2 Frequency Range 2
  • the term “frequency range 2 (FR2) ” used herein can comprise frequency bands from 24.25 GHz to 52.6 GHz.
  • a US can assume that reception occasions of a physical broadcast channel (PBCH) , PSS, and SSS are in consecutive symbols, and form a SS/PBCH block.
  • PBCH physical broadcast channel
  • PSS PSS
  • SSS SSS
  • the first symbol indexes for candidate SS/PBCH blocks are determined according to the subcarrier spacing of SS/PBCH blocks, where index 0 corresponds to the first symbol of the first slot in a half-frame.
  • SS/PBCH block pattern comprises at least the set of indications of the first symbol indexes for candidate SS/PBCH blocks within a half frame with SS/PBCH blocks is.
  • Candidate synchronization signal (SS) /physical broadcast channel (PBCH) blocks in a half frame can be indexed in an ascending order in time from 0 to where is determined according to SS/PBCH block patterns.
  • L max can represent a maximum number of SS/PBCH block indexes in a cell, and the maximum number of transmitted SS/PBCH blocks within a half frame is L max .
  • L max 8 for and 15 kHz subcarrier spacing (SCS) of SS/PBCH blocks and for and 30 kHz SCS of SS/PBCH blocks
  • a UE may assume that half frames with SS/PBCH blocks occur with a periodicity of 2 frames. (20ms) .
  • the UE can be provided per serving cell by a parameter related to the length of the DBTW (for example, “DiscoveryBurst-WindowLength-r16” ) which indicates a duration of the discovery burst transmission window.
  • DBTW discovery burst transmission window
  • discovery burst can refer to a DL transmission burst including a set of signal (s) and/or channel (s) confined within a window and associated with a duty cycle.
  • the discovery burst can be any of the following: transmission (s) initiated by an eNB that includes a primary synchronization signal (PSS) , secondary synchronization signal (SSS) and cell-specific reference signal (s) (CRS) and may include non-zero power channel state information (CSI) reference signals (CSI-RS) ; transmission (s) initiated by a gNB that includes at least an SS/PBCH block consisting of a primary synchronization signal (PSS) , secondary synchronization signal (SSS) , physical broadcast channel (PBCH) with associated demodulation reference signal (DM-RS) and may also include control resource set (CORESET) for physical downlink control channel (PDCCH) scheduling physical downlink shared channel (PDSCH) with system information block (SIB) 1, and PDSCH carrying SIB1
  • PSS primary
  • a DL transmission burst can be defined as a set of transmissions from an eNB/gNB without any gaps greater than a predetermined length. Only as an example, the predetermined length can be 16 ⁇ s. If a parameter related to the length of the DBTW is not provided, the UE can assume that the duration of the discovery burst transmission window is a half frame. For a serving cell, the UE assumes that a periodicity of the discovery burst transmission window is same as a periodicity of half frames for receptions of SS/PBCH blocks in the serving cell.
  • synchronization signal block (SSB) /discovery reference signal (DRS) transmission procedure should provide more flexibility to address channel sensing and the tradeoffs between the sensing reliability and latency.
  • Enabling/disabling DBTW considering LBT exempt operation and overlapping licensed/unlicensed bands needs to be studied.
  • the synchronization signal (SS) /physical broadcast channel (PBCH) blocks /DRS pattern for the enabling/disabling DBTW also needs to be studied.
  • a terminal device receives a master information block from a network device.
  • the MIB at least indicates a configuration of a discovery burst transmission window (DBTW) .
  • the configuration is determined based on iterative measurements on a plurality of synchronization system block within a time duration.
  • the terminal device determines a pattern for SSB transmission based on the configuration.
  • the terminal device receives at least one SSB in the plurality of SSBs from the network device based on the pattern. In this way, it achieves enabling/disabling DBTW per beam or per cell. Further, it achieves efficient use of channel occupied time.
  • Fig. 1 illustrates a schematic diagram of a communication system in which embodiments of the present disclosure can be implemented.
  • the communication system 100 which is a part of a communication network, comprises a terminal device 110-1, a terminal device 110-2, ..., a terminal device 110-N, which can be collectively referred to as “terminal device (s) 110. ”
  • the number N can be any suitable integer number.
  • the communication system 300 further comprises a network device 120.
  • the terminal devices 110 and the network device 120 can communicate with each other.
  • Communications in the communication system 100 may be implemented according to any proper communication protocol (s) , comprising, but not limited to, cellular communication protocols of the first generation (1G) , the second generation (2G) , the third generation (3G) , the fourth generation (4G) , the fifth generation (5G) and the sixth generation (6G) and on the like, wireless local network communication protocols such as Institute for Electrical and Electronics Engineers (IEEE) 802.11 and the like, and/or any other protocols currently known or to be developed in the future.
  • s cellular communication protocols of the first generation (1G) , the second generation (2G) , the third generation (3G) , the fourth generation (4G) , the fifth generation (5G) and the sixth generation (6G) and on the like
  • wireless local network communication protocols such as Institute for Electrical and Electronics Engineers (IEEE) 802.11 and the like, and/or any other protocols currently known or to be developed in the future.
  • the communication may utilize any proper wireless communication technology, comprising but not limited to: Code Divided Multiple Address (CDMA) , Frequency Divided Multiple Address (FDMA) , Time Divided Multiple Address (TDMA) , Frequency Divided Duplexer (FDD) , Time Divided Duplexer (TDD) , Multiple-Input Multiple-Output (MIMO) , Orthogonal Frequency Divided Multiple Access (OFDMA) and/or any other technologies currently known or to be developed in the future.
  • CDMA Code Divided Multiple Address
  • FDMA Frequency Divided Multiple Address
  • TDMA Time Divided Multiple Address
  • FDD Frequency Divided Duplexer
  • TDD Time Divided Duplexer
  • MIMO Multiple-Input Multiple-Output
  • OFDMA Orthogonal Frequency Divided Multiple Access
  • Embodiments of the present disclosure can be applied to any suitable scenarios.
  • embodiments of the present disclosure can be implemented at reduced capability NR devices.
  • embodiments of the present disclosure can be implemented in one of the followings: NR multiple-input and multiple-output (MIMO) , NR sidelink enhancements, NR systems with frequency above 52.6GHz, an extending NR operation up to 71GHz, narrow band-Internet of Thing (NB-IOT) /enhanced Machine Type Communication (eMTC) over non-terrestrial networks (NTN) , NTN, UE power saving enhancements, NR coverage enhancement, NB-IoT and LTE-MTC, Integrated Access and Backhaul (IAB) , NR Multicast and Broadcast Services, or enhancements on Multi-Radio Dual-Connectivity.
  • MIMO multiple-input and multiple-output
  • NR sidelink enhancements NR systems with frequency above 52.6GHz, an extending NR operation up to 71GHz
  • NB-IOT narrow band-Internet of
  • Fig. 2 shows a signaling chart illustrating process 200 among devices according to some example embodiments of the present disclosure. Only for the purpose of discussion, the process 200 will be described with reference to Fig. 1.
  • the process 200 may involve the terminal device 110-1 and the network device 120 in Fig. 1. It should be noted that the process can involve any proper devices.
  • the terminal device 110-1 can determine its frequency band.
  • the frequency band can be below 6 GHz.
  • the terminal device 110-1 can determine the number of SS/PBCH blocks (SSBs) based on the frequency band.
  • SSBs SS/PBCH blocks
  • the network device 120 determines 2005 a configuration of a DBTW.
  • the configuration of the DBTW can be determined based on an iterative measurement on a plurality of SS/PBCH blocks (SSBs) within a time duration.
  • SSBs SS/PBCH blocks
  • Fig. 3 shows an example method 300 for determining the configuration of the DBTW. It should be noted that the configuration of the DBTW can be determined using any suitable manners.
  • the network device 120 can classify the plurality of SSBs into a plurality of classes. For example, for the case where the maximum number of transmitted SSBs within a half frame is M, the network device 120 can divide all actually transmitted SSBs into several initial non-overlapping groups. The network device 120 can initialize the group list with grouping information and clears the long-term measurement counter.
  • Initial classes for all transmitted SSBs may be based on one or multiple considerations. For certain deployment, grouping can be implemented according to at least in part on a spatial proximity of SSBs transmission beams. Spatial proximity may be defined based at least in part on a spatial relationship of two or more beams with each other. Two or more SSBs with adjacent transmission direction or directional coverage can be grouped into the same group. Alternatively, two or more SSBs with partially overlapping transmission beams may be associated in a group based on spatial proximity.
  • the number of SSBs in each class may be the same. In other words, the plurality of SSBs can be equally classified. Alternatively, the number of SSBs in each class may be different. All SSBs in a class are different from SSBs in the other groups. It should be noted that the number of SSBs in a class/group can be any suitable number. For example, in some embodiments, each group may comprise only one SSB, i.e., there are 64 initial groups at most.
  • Fig. 4 illustrates a schematic diagram of an iteration procedure according to some embodiments of the present disclosure.
  • the plurality of SSBs are classified into the classes 410-1, 410-2, ..., 410-5, ..., 410-M, where M can be any integer number.
  • the SSBs with indexes 0, 1, 2 and 3 are grouped as the group 410-1
  • the SSBs with indexes 4, 5, 6 and 7 are grouped as the group 410-2
  • the SSBs with indexes 16, 17, 18 and 19 are grouped as the group 410-5.
  • the initial classes/groups shown in Fig. 4 are only examples not limitations.
  • the network device 120 can perform a measurement with a predetermined periodicity for each class.
  • the predetermined periodicity may not be larger than SSB burst set transmission period.
  • the predetermined periodicity can be 20ms for UE performing initial access.
  • the network device 120 can periodically perform independent LBT procedures with a predefined periodicity and record the LBT results respectively.
  • the network device 120 can perform a listen before talk (LBT) procedure on a shared spectrum channel before the transmission 4040 of the set of SS/PBCH blocks.
  • LBT listen before talk
  • the network device 120 can perform a CCA procedure on the shared spectrum channel before the transmission 4040 of the set of SS/PBCH blocks.
  • the CCA can comprise carrier sensing (CS) and energy detection.
  • the Carrier Sense (CS) mechanism can comprise a physical CS and a virtual CS.
  • the physical CS may be provided by the physical layer (PHY) and may be a straightforward measuring of the received signal strength of a valid 802.11 symbol. If it is above a certain level the medium is considered busy. If the LBT or CCA indicates that the shared spectrum channel is busy, the network device 120 may not transmit SS/PBCH blocks on the shared spectrum channel. If the LBT or CCA indicates that the shared spectrum channel is idle, the network device 120 may transmit the set of SS/PBCH blocks on the shared spectrum channel.
  • the sensing/LBT for each group and each time LBT procedure should at least cover the variety of directional overages of beams used to transmit the plurality of SSBs in that group, i.e. the quasi (or pseudo) -omni-directional LBT.
  • the beams used to transmit the plurality of SSBs in a group and the corresponding sensing/LBT beam may match based at least in part on respective sensing/LBT beam and the SSBs transmission beams overlapping each other (e.g., fully overlapping, substantially overlapping, at least partially overlapping, and/or the like) .
  • the network device 120 may perform transmission per group according to the last LBT result for the group. If the last result for certain group is failed, the network device 120may drop this group. Otherwise, the network device 120 can successively transmit all SSBs in this group without additional LBT before beam switching for different SSBs transmission.
  • the network device 120 can perform a received signal strength indicator (RSSI) measurement on each group.
  • RSSI received signal strength indicator
  • the network device 120 can perform a channel occupancy measurement on each group. It should be noted that the measurement can be any suitable type of measurements.
  • the measurements for different groups/classes can be performed concurrently.
  • the measurements for different groups/classes can be performed sequentially.
  • the measurement for each group may be consecutive or uniformly distributed in the duration.
  • the network device 120 can compare a result of the measurement with a threshold result.
  • the network device 120 can reclassify the plurality of SSBs based on the comparison. For example, if the LBT procedure is performed, the network device 120 can compare the failure probability of the LBT procedure with a threshold probability. If the failure probabilities of the LBT procedures on several groups are lower than the threshold probability, the network device 120 can merge these groups. The merging can be implemented according to at least in part on a spatial proximity of SSB sets transmission beams in two groups. For example, two groups with partially overlapping SSBs transmission beams may be associated in a new group. As shown in Fig.
  • the network device 120 can merge the group 410-1 with the group 410-2 to generate the group 420-1 which comprises the SSBs with the indexes 0, 1, 2, 3, 4, 5, 6 and 7.
  • the network device 120 can divide each group into two non-overlapping subgroups. For example, if a certain group is formed by merging two groups in the last iteration, the network device 120 can reuse the original two groups instead of this group. Alternatively, the network device 120 can divide the group into two subgroups. Each subgroup contains equal or similar number of SSBs with spatial proximity. If a certain group has only one SSB, the network device 120 keeps this group unchanged.
  • the network device 120 can divide the group 410-5 into two groups 420-2 and 420-3.
  • the group 410-5 can comprise SSBs with indexes 16, 17, 18 and 19.
  • the group 420-2 can comprise SSBs with indexes 16 and 17
  • the group 420-3 can comprise SSBs with indexes 18 and 19.
  • the network device 120 can determine whether a condition is fulfilled. In some embodiments, if the number of total groups/classes exceeds a first number, the condition is fulfilled. In other embodiments, if the number of groups which include a predetermined number of SSBs exceeds a second number, the condition is fulfilled.
  • the predetermined number of SSBs can be any suitable number, for example, 1 or 2. Alternatively, if the number of groups is below a third number, the condition is fulfilled.
  • the network device 120 can start a counter before performing the measurement.
  • the counter can be increased by one each time after the step 340 is performed.
  • the condition is fulfilled.
  • the first number, second number, third number and fourth number can be any suitable numbers.
  • the duration for the iterations exceeds a threshold duration, the condition is fulfilled.
  • the duration can be any suitable value.
  • the network device 120 will go back to the block 320 and perform the steps 320, 330 and 340 again. If the condition is fulfilled, the network device 120 can determine the configuration. In some embodiments, if the number of total groups exceeds the first number and the number of groups which include the predetermined number of SSBs exceeds the second number, the network device 120 can determine that the DBTW is enabled for the plurality of SSBs. Alternatively, if the number of total classes is below the third number, the network device 120 can determine that the DBTW is disabled for the plurality of SSBs.
  • the network device 120 can enable the DBTW for a group and disable the DBTW for other group (s) .
  • the network device 120 can disable the DBTW for the group 430-1 and enable the DBTW for the group 430-2.
  • the group 430-1 can comprise any suitable number of SSBs (i.e., beams for transmitting SSBs) and the group 430-2 can comprise any suitable number of SSBs.
  • the groups 430-1 and 430-2 are generated after the iteratively performing the steps 320, 330 and 340. It should be noted that the number of groups/classes shown in Fig. 4 and the number of SSBs (or SSB beams) in the groups are only examples not limitations.
  • the network device 120 transmits 2010 a mater information block (MIB) to the terminal device 110-1.
  • the MIB at least indicates the configuration of the DBTW.
  • the MIB can comprise information for the terminal device 110-1 to perform an initial access.
  • the MIB can be received when the terminal device 110-1 is in a radio resource control (RRC) _IDLE state.
  • RRC radio resource control
  • the MIB can be received when the terminal device 110-1 is in a RRC_CONNECTED state.
  • the MIB at least indicates the configuration of the discovery burst transmission window (DBTW) .
  • the network device 120 can transmit system information block related to the DBTW configuration.
  • the network device 120 can transmit information related to the DBTW configuration on the physical downlink shared channel.
  • the information related to the DBTW configuration can be transmitted via RRC signaling.
  • the configuration of the DBTW can be indicated by one or more bits in the MIB.
  • the one or more bits can comprise a bit in a physical downlink control channel configuration system information (pdcch-ConfigSIB) field.
  • the one or more bits can comprise a bit in a subcarrier spacing common (subCarrierSpacingCommon) field.
  • the one or more bits may comprise a bit in a synchronization signal block subcarrier offset (ssb-SubcarrierOffset) field.
  • the one or more bits can comprise a bit in the MIB related to the DBTW.
  • the one or more bits can comprise any one or any combination of the above bits.
  • the subCarrierSpacingCommon most significant bit (MSB) of controlResourceSetZero (for example, in physical downlink control channel-configuration system information block 1 (PDCCH-configSIB1) and lest significant bit (LSB) of ssb-SubcarrierOffset in the MIB payload may be spare.
  • MSB most significant bit
  • LSB lest significant bit
  • the configuration of the DBTW can be indidated with these three bits and a bit related to the DBTW (for example, an original spare bit) in the MIB payload for the terminal device 120 performing initial access in serving cell without any prior information of network, or the terminal device 120 performing radio resource measurement (RRM) in neighbor cells.
  • the MIB can indicate candidate SSB indexes.
  • the MIB can comprise quasi co-location (QCL) relation.
  • the terminal device 110-1 determines 2015 a pattern for a set of synchronization signal (SS) /physical broadcast channel (PBCH) blocks based on the configuration.
  • the configuration may indicate that the DBTW is disabled.
  • the pattern can indicate that the plurality of SSBs are transmitted in continuous slots. For example, if the DBTW is disabled, the maximum number of SS/PBCH block indexes in a cell can be 64 for the transmission without LBT in share spectrum channel access.
  • the candidate SS/PBCH blocks in a half frame can indexed in an ascending order in time from 0 to 63.
  • the configuration of the DBTW can indicate that the DBTW is disabled and the number of SS/PBCH block indexes may be same as the number of candidate SSBs. For example, if the DBTW is disabled for the plurality of SSBs, the maximum number of transmitted SSBs within a half frame is 64, the candidate SSBs in a half frame are indexed in an ascending order in time from 0 to 63. For example, as shown in Fig. 5, the indexes of the SSBs can be 0, 1, 2, 3, ..., 12, 13, 14, 15, 16, 17, ..., 60, 61, 62 and 63.
  • the SSBs can be transmitted in slots 5110-1, 5110-2, ..., 5110-7, 5110-8, 5110-9, 5110-31 and 5110-32. It should be noted that the number of slots shown in Fig. 5 is only an example. As shown in Fig. 5, the first symbols of the candidate SS/PBCH blocks have indexes ⁇ 4, 8, 16, 20 ⁇ +28*n, where for operation with shared spectrum channel access, n can be any one from ⁇ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 ⁇ .
  • the configuration of the DBTW can indicate that the DBTW is enabled for a subset of SSBs of the plurality of SSBs.
  • the terminal device 110-1 can determine a set of candidate positions and a set of additional candidate positions for the SSB based on the configuration.
  • the terminal device 110-1 can determine indexes of the set of candidate positions and the set of additional candidate positions based on the configuration.
  • the pattern can indicate that the subset of SSBs can transmitted on the set of candidate positions in a first set of continuous slots or the set of additional candidate positions in a second set of continuous slots. For example, as shown in Fig.
  • the candidate SSBs in a half frame are indexed in an ascending order in time from 0 to 63.
  • the candidate SSBs can be indexed from 0 to 63 and additional candidate SSBs can be indexed from A0 to A15.
  • the candidate SSBs with indexes 0, 1, 2, 3, ..., 12, 13, 14, 15, 16, 17, ..., 60, 61, 62 and 63 can be transmitted in slots 6110-1, 6110-2, ..., 6110-7, 6110-8, 6110-9, ..., 6110-31 and 6110-32.
  • the additional candidate SSBs with indexes A0, A1, ..., A6, A7, A8, A9, ..., A14 and A15 can be transmitted in slots 6210-1, 6210-4, 6210-5 and 6210-8. It should be noted that the number of slots shown in Fig. 6 is only an example.
  • the index of additional candidate SSB indicates the timing offset between candidate SSB and additional candidate SSB (s) with QCL relation based on default design rule. For a certain SSB transmission when DBTW is enabled, there may be multiple chances to transmit the SSB depending on the design rule of corresponding SSB pattern.
  • the first symbols of the candidate and additional candidate SS/PBCH blocks have indexes ⁇ 4, 8, 16, 20 ⁇ +28*n, where for operation with shared spectrum channel access within, n can be any one from ⁇ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 ⁇ .
  • the terminal device 110-1 can determine the additional candidate SS/PBCH block index from PBCH payload bits subCarrierSpacingCommonor, LSB of ssb-SubcarrierOffset, MSB of controlResourceSetZero and spare bit.
  • the QCL relation indication when DBTW is enabled for few number of SSB transmission, it can have different flexibility according to the number of available indications/permutations out of DBTW indication bits.
  • the pattern indicates that a first subset of candidate SSBs with continuous indexes in the subset of SSBs is mapping to a first subset of additional candidate positions with continuous indexes and a second subset of candidate SSBs with continuous indexes in the subset of SSBs is mapping to a second subset of additional candidate positions with continuous indexes.
  • the number of available indications out of DBTW indication bits can be 8 and only two of 64 SSBs need to be transmitted within DBTW.
  • candidate SSBs indexed from 0 to 31 may be mapped to additional candidate SSB indexed from A0 to A7 depending on whether certain SSB(s) need to be transmitted within DBTW.
  • the candidate SSBs indexed from 32 to 63 may be mapped to additional candidate SSBs indexed from A8 to A15. Only as an example, the candidate SSB with the index 0 can be transmitted in the slot 6110-1. If the candidate SSB with the index 0 cannot be transmitted in the slot 6110-1, the additional candidate SSB with the index A0 may be transmitted .
  • the pattern further indicates that one candidate SSB with an even index in the subset of SSBs is mapped to one additional candidate position with an even index in the set of additional candidate positions.
  • the candidate SSBs with even indexes from 0 to 62 may be mapped to additional candidate SSBs with even indexes from A0 to A14, and the candidate SSBs with odd indexes from 1 to 63 may be mapped to additional candidate SSBs with odd indexes from A1 to A15.
  • the candidate SSB with the index 0 can be transmitted in the slot 6110-1. If the candidate SSB with the index 0 cannot be transmitted in the slot 6110-1, the additional candidate SSB with the index A0 may be transmitted.
  • the candidate SSB with the index 3 can be transmitted in the slot 6110-2. If the candidate SSB with the index 3 cannot be transmitted in the slot 6110-2, certain additional candidate SSB with odd index, for example the index A1 or A7, may be transmitted.
  • the pattern further indicates that a first subset of candidate SSBs with continuous indexes in the subset of SSBs is mapping to a first subset of additional candidate positions with continuous indexes, a second subset of candidate SSBs with continuous indexes in the subset of SSBs is mapping to a second subset of additional candidate positions with continuous indexes, and one candidate SSB with an even index is mapped to one additional candidate with an even index.
  • the number of available indications out of DBTW indication bits can be 4 and only two of 64 SSBs need to be transmitted within DBTW.
  • the candidate SSBs indexed from 0 to 31 may be mapped to additional candidate SSBs indexed from A0 to A7, and the candidate SSBs indexed from 32 to 63 may be mapped to additional candidate SSBs indexed from A8 to A15.
  • the candidate SSBs with even/odd indexes may be mapped to additional candidate SSBs with even/odd indexes, respectively.
  • the configuration of the DBTW can indicate that the DBTW is enabled for a subset of SSBs of the plurality of SSBs.
  • the terminal device 110-1 can determine a set of candidate positions for the SSB based on the configuration.
  • the terminal device 110-1 can determine indexes of the set of candidate positions based on the configuration.
  • the pattern can indicate that the subset of SSBs transmitted in a set of continuous slots and the set of additional candidate positions in a set of gap slots. For example, as shown in Fig.
  • the candidate SSBs in a half frame are indexed in an ascending order in time from 0 to 63.
  • the candidate SSBs can be indexed from 0 to 63 and additional candidate SSBs can be indexed from A0 to A15.
  • the candidate SSBs with indexes 0, 1, 2, 3, ..., 12, 13, 14, 15, 16, 17, ..., 60, 61, 62 and 63 can be transmitted in slots 7110-1, 7110-2, ..., 7110-7, 7110-8, 7110-9, ..., 7110-31 and 7110-32.
  • the additional candidate SSBs with indexes A0, A1, A2, A3, ..., A12, A13, A14 and A15 can be transmitted in slots 7210-1, 7210-2, 7210-7 and 7210-8.
  • the slots for the additional candidate SSBs can be gap slots. It should be noted that the number of slots shown in Fig. 7 is only an example.
  • the index of additional candidate SSB indicates the timing offset between candidate SSB and additional candidate SSB (s) with QCL relation based on default design rule. For certain SSB transmission when DBTW is enabled, there may be multiple chances to transmit the SSB depending on the design rule of corresponding SSB pattern.
  • the first symbols of the candidate and additional SS/PBCH blocks have indexes ⁇ 4, 8, 16, 20 ⁇ +28*n, where for operation with shared spectrum channel access within, n can be any one from ⁇ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 ⁇ .
  • the terminal device 110-1 can determine the number of candidate SSBs.
  • the terminal device 110-1 can determine an index of a first symbol of the candidate SSBs.
  • the terminal device 110-1 can determine the index of the first symbol based on ⁇ 4, 8, 16, 20 ⁇ +28*n, where n is any one from ⁇ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 ⁇ .
  • the he terminal device 110-1 can determine the index of the first symbol based on ⁇ 4, 8, 16, 20 ⁇ +28*n, where n is any one from ⁇ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 ⁇ .
  • the terminal device 110-1 can determine the additional candidate SS/PBCH block index from PBCH payload bits subCarrierSpacingCommonor, LSB of ssb-SubcarrierOffset, MSB of controlResourceSetZero and spare bit.
  • the QCL relation indication when DBTW is enabled for few number of SSB transmission, it can have different flexibility according to the number of available indications/permutations out of DBTW indication bits.
  • the pattern further indicates that a first subset of candidate SSBs with continuous indexes in the subset of SSBs is mapping to a first subset of additional candidate positions with continuous indexes and a second subset of candidate SSBs with continuous indexes in the subset of SSBs is mapping to a second subset of additional candidate positions with continuous indexes.
  • the number of available indications out of DBTW indication bits can be 8 and only two of 64 SSBs need to be transmitted within DBTW.
  • candidate SSBs indexed from 0 to 31 may be mapped to additional candidate SSB indexed from A0 to A7 depending on whether this SSB need to be transmitted within DBTW.
  • the candidate SSBs indexed from 32 to 63 may be mapped to additional candidate SSB indexed from A8 to A15. Only as an example, the candidate SSB with the index 0 can be transmitted in the slot 7110-1. If the candidate SSB with the index 0 cannot be transmitted in the slot 7110-1, the additional candidate SSB with the index A0 may be transmitted.
  • the pattern further indicates that one candidate SSB with an even index in the subset of SSBs is mapped to one additional candidate position with an even index in the set of additional candidate positions.
  • the candidate SSBs with even indexes from 0 to 62 may be mapped to additional candidate SSBs with even indexes from A0 to A14, and the SSBs with odd indexes from 1 to 63 may be mapped to additional candidate SSBs with odd indexes from A1 to A15.
  • the candidate SSB with the index 0 can be transmitted in the slot 7110-1. If the candidate SSB with the index 0 cannot be transmitted in the slot 7110-1, the additional candidate SSB with the index A0 may be transmitted.
  • the candidate SSB with the index 3 can be transmitted in the slot 7110-2. If the candidate SSB with the index 3 cannot be transmitted in the slot 7110-2, certain additional candidate SSB with odd index, for example the index A1 or A13, may be transmitted.
  • One SSB can be transmitted at its candidate position or at an additional candidate position.
  • the additional candidate position can be prior to the corresponding candidate position. Alternatively, the additional candidate position can be after the corresponding candidate position.
  • the candidate SSB with the index 16 can be transmitted in the slot 7110-9.
  • the candidate SSB with the index 16 can be transmitted at the additional candidate position A2 which is in the slot 7210-2.
  • the candidate SSB with the index 16 can be transmitted at the additional candidate position A12 which is in the slot 7210-7.
  • the pattern further indicates that a first subset of candidate SSBs with continuous indexes in the subset of candidate SSBs is mapping to a first subset of additional candidate positions with continuous indexes, a second subset of candidate SSBs with continuous indexes in the subset of candidate SSBs is mapping to a second subset of additional candidate positions with continuous indexes, and one candidate SSB with an even index is mapped to one additional candidate position with an even index.
  • the number of available indications out of DBTW indication bits can be 4 and only two of 64 SSBs need to be transmitted within DBTW.
  • the candidate SSBs indexed from 0 to 31 may be mapped to additional candidate SSB indexed from A0 to A7, and the candidate SSBs indexed from 32 to 63 may be mapped to additional candidate SSB indexed from A8 to A15.
  • the candidate SSBs with even/odd indexes may be mapped to additional candidate SSBs with even/odd indexes, respectively.
  • the network device 120 transmits 2020 at least one synchronization signal (SS) /physical broadcast channel (PBCH) block to the terminal device 110-1 based on the pattern. For example, the network device 120 can transmit the candidate SSB with the index 0. The network device 120 can transmit the candidate SSB with the index 0 at the original candidate position. Alternatively, the network device 120 can transmit the corresponding SSB with the index A0 at the additional candidate position. The terminal device 110-1 can determine on which position the SSB is received. In this situation, the terminal device 110-1 can determine boundaries of the frame based on the determined position.
  • SS synchronization signal
  • PBCH physical broadcast channel
  • Fig. 8 shows a flowchart of an example method 800 in accordance with an embodiment of the present disclosure.
  • the method 800 can be implemented at any suitable devices. Only for the purpose of illustrations, the method 800 is described to be implemented at the terminal device 110-1.
  • the terminal device 110-1 receives a master information block (MIB) from a network device.
  • the MIB at least indicates a configuration of a DBTW.
  • the configuration can be determined based on iterative measurements on a plurality of synchronization signal/physical broadcast channel (SS/PBCH) blocks (SSBs) within a time duration;
  • SS/PBCH synchronization signal/physical broadcast channel
  • the terminal device 110-1 determines, based on the configuration, a pattern for a SSB transmission. In some embodiments, if the configuration indicates that the DBTW is disabled for the plurality of SSBs, the terminal device 110-1 can obtain the pattern which indicates that he plurality of SSBs are transmitted in continuous slots.
  • the terminal device 110-1 can determine a set of candidate positions based on the configuration.
  • the terminal device 110-1 can further determine indexes of the set of additional candidate positions based on the configuration.
  • the terminal device 110-1 can also determine the pattern indicating the subset of SSBs transmitted on candidate positions in a first set of continuous slots or on the set of additional candidate positions in a second set of continuous slots.
  • the configuration indicates that a first subset of candidate SSBs with continuous indexes in the subset of candidate SSBs is mapping to a first subset of additional candidate positions with continuous indexes and a second subset of candidate SSBs with continuous indexes in the subset of candidate SSBs is mapping to a second subset of additional candidate positions with continuous indexes.
  • the configuration further indicates that one candidate SSB with an even index in the subset of candidate SSBs is mapped to one additional candidate position with an even index in the set of additional candidate positions.
  • the pattern further indicates that a first subset of candidate SSBs with continuous indexes in the subset of candidate SSBs is mapping to a first subset of additional candidate positions with continuous indexes, a second subset of candidate SSBs with continuous indexes in the subset of candidate SSBs is mapping to a second subset of additional candidate positions with continuous indexes, and one candidate SSB with an even index is mapped to one additional candidate position with an even index.
  • the terminal device 110-1 can determine a set of candidate and additional candidate positions based on the configuration.
  • the terminal device 110-1 can also determine indexes of the set of candidate positions and additional candidate positions based on the configuration.
  • the terminal device 110-1 can obtain the pattern which indicates that the subset of SSBs are transmitted on candidate positions in a set of slots or on the set of additional candidate positions in a set of gap slots.
  • the pattern further indicates that a first subset of candidate SSBs with continuous indexes in the subset of candidate SSBs is mapping to a first subset of additional candidate positions with continuous indexes and a second subset of candidate SSBs with continuous indexes in the subset of candidate SSBs is mapping to a second subset of additional candidate positions with continuous indexes.
  • the pattern further indicates that one candidate SSB with an even index in the subset of candidate SSBs is mapped to one additional candidate position with an even index in the set of additional candidate positions.
  • the pattern further indicates that a first subset of candidate SSBs with continuous indexes in the subset of candidate SSBs is mapping to a first subset of additional candidate positions with continuous indexes, a second subset of candidate SSBs with continuous indexes in the subset of candidate SSBs is mapping to a second subset of additional candidate positions with continuous indexes, and one candidate SSB with an even index is mapped to one additional candidate position with an even index.
  • the terminal device 110-1 receives, from the network device 120, at least one SSB in the plurality of SSBs based on the pattern. For example, the terminal device 110-1 can receive the SSB with the index 0. The terminal device 110-1 can receive the SSB with the index 0 at the candidate position. Alternatively, the terminal device 110-1 can receive the SSB with the index 0 at the additional candidate position. The terminal device 110-1 can determine which position the SSB with index 0 is received. In this situation, the terminal device 110-1 can determine boundaries of the frame based on the determined position.
  • Fig. 9 shows a flowchart of an example method 900 in accordance with an embodiment of the present disclosure.
  • the method 900 can be implemented at any suitable devices. Only for the purpose of illustrations, the method 900 is described to be implemented at the network device 120.
  • the network device 120 determines a configuration of a discovery burst transmission window (DBTW) determined based on an iterative measurement on a plurality of synchronization signal/physical broadcast channel (SS/PBCH) blocks (SSBs) within a time duration.
  • DBTW discovery burst transmission window
  • the network device 120 can classify the plurality of SSBs into a plurality of classes. For each class in the plurality of classes, the network device 120 can iteratively perform the following until a condition is fulfilled. In this case, the network device 120 can perform the measurement with a predetermined periodicity. The network device 120 can compare a result of the measurement with a threshold result. The network device 120 can also reclassify the plurality of SSBs based on the comparison. In this embodiment, the network device 120 can determine the configuration based on the iterations.
  • the condition comprises one of: the number of total classes exceeding a first number, the number of classes comprising a predetermined number of SSBs exceeding a second number, the number of total classes below a third number, the number of the iterations exceeding a fourth number, or a duration for the iterations exceeding a threshold duration.
  • the network device 120 can determine that DBTW is enabled for the plurality of SSBs.
  • the network device 120 can determine that DBTW is disabled for the plurality of SSBs. In another embodiment, if the number of total classes is above a third number and below a first number, the network device 120 can determine that DBTW is enabled for a subset of SSBs.
  • the measurement comprises one of: a listen-before-talk measurement, a received signal strength indicator measurement, or a channel occupancy measurement.
  • the network device 120 transmits, to a terminal device 110-1, a master information block (MIB) at least indicating the configuration.
  • the MIB at least indicates the configuration of the DBTW.
  • the MIB can comprise information for the terminal device 110-1 to perform an initial access.
  • the MIB can be received when the terminal device 110-1 is in a radio resource control (RRC) _IDLE state.
  • RRC radio resource control
  • the MIB can be received when the terminal device 110-1 is in a RRC_CONNECTED state.
  • the MIB at least indicates the configuration of the discovery burst transmission window (DBTW) .
  • the network device 120 can transmit system information block related to the DBTW configuration.
  • the network device 120 can transmit information related to the DBTW configuration on the physical downlink shared channel.
  • the information related to the DBTW configuration can be transmitted via RRC signaling.
  • the network device 120 transmits, to the terminal device 110-1, at least one SSB in the plurality of SSBs based on the configuration.
  • Fig. 10 is a simplified block diagram of a device 1000 that is suitable for implementing embodiments of the present disclosure.
  • the device 1000 can be considered as a further example implementation of the terminal device 110 and the network device 120 as shown in Fig. 1. Accordingly, the device 1000 can be implemented at or as at least a part of the terminal device or the network device.
  • the device 1000 includes a processor 1010, a memory 1020 coupled to the processor 1010, a suitable transmitter (TX) and receiver (RX) 1040 coupled to the processor 1010, and a communication interface coupled to the TX/RX 1040.
  • the memory 1020 stores at least a part of a program 1040.
  • the TX/RX 1040 is for bidirectional communications.
  • the TX/RX 1040 has at least one antenna to facilitate communication, though in practice an Access Node mentioned in this application may have several ones.
  • the communication interface may represent any interface that is necessary for communication with other network elements, such as X2 interface for bidirectional communications between eNBs, S1 interface for communication between a Mobility Management Entity (MME) /Serving Gateway (S-GW) and the eNB, Un interface for communication between the eNB and a relay node (RN) , or Uu interface for communication between the eNB and a terminal device.
  • MME Mobility Management Entity
  • S-GW Serving Gateway
  • Un interface for communication between the eNB and a relay node (RN)
  • Uu interface for communication between the eNB and a terminal device.
  • the program 1040 is assumed to include program instructions that, when executed by the associated processor 1010, enable the device 1000 to operate in accordance with the embodiments of the present disclosure, as discussed herein with reference to Fig. 3 to 14.
  • the embodiments herein may be implemented by computer software executable by the processor 1010of the device 1000, or by hardware, or by a combination of software and hardware.
  • the processor 1010 may be configured to implement various embodiments of the present disclosure.
  • a combination of the processor 1010and memory 1020 may form processing means 1550 adapted to implement various embodiments of the present disclosure.
  • the memory 1020 may be of any type suitable to the local technical network and may be implemented using any suitable data storage technology, such as a non-transitory computer readable storage medium, semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory, as non-limiting examples. While only one memory 1020 is shown in the device 1000, there may be several physically distinct memory modules in the device 1000.
  • the processor 1010 may be of any type suitable to the local technical network, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples.
  • the device 1000 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock which synchronizes the main processor.
  • a terminal device comprises circuitry configured to: receive a master information block (MIB) from a network device, the MIB at least indicating a configuration of a discovery burst transmission window (DBTW) ; determine, based on the configuration, a pattern for a SSB transmission; and receive, from the network device, at least one SSB in the plurality of SSBs based on the pattern.
  • MIB master information block
  • DBTW discovery burst transmission window
  • the configuration indicates that the DBTW is disabled for the plurality of SSBs and the terminal device comprises circuitry configured to determine the pattern for the SSB transmission by obtaining the pattern indicating the plurality of SSBs transmitted in continuous slots.
  • the configuration indicates that the DBTW is disabled for the plurality of SSBs and the terminal device comprises circuitry configured to determine the pattern for the SSB transmission by obtaining the pattern indicating the plurality of SSBs transmitted in continuous slots.
  • the configuration indicates that the DBTW is enabled for a subset of SSBs of the plurality of SSBs and the terminal device comprises circuitry configured to determine the pattern for the SSB transmission by: determining a set of candidate positions and additional candidate positions based on the configuration; determining indexes of the set of candidate positions and additional candidate positions based on the configuration; and determining the pattern indicating the subset of SSBs transmitted in a first set of continuous slots and the set of additional candidate positions in a second set of continuous slots.
  • the configuration indicates that a first subset of candidate SSBs with continuous indexes in the subset of candidate SSBs is mapping to a first subset of additional candidate positions with continuous indexes and a second subset of candidate SSBs with continuous indexes in the subset of candidate SSBs is mapping to a second subset of additional candidate positions with continuous indexes.
  • the configuration further indicates that one candidate SSB with an even index in the subset of candidate SSBs is mapped to one additional candidate position with an even index in the set of additional candidate positions.
  • the pattern further indicates that a first subset of candidate SSBs with continuous indexes in the subset of candidate SSBs is mapping to a first subset of additional candidate positions with continuous indexes, a second subset of candidate SSBs with continuous indexes in the subset of candidate SSBs is mapping to a second subset of additional candidate positions with continuous indexes, and one candidate SSB with an even index is mapped to one additional candidate position with an even index.
  • the configuration indicates that the DBTW is enabled for a subset of SSBs of the plurality of SSBs and the terminal device comprises circuitry configured to determine the pattern for the SSB transmission by determining a set of candidate positions and additional candidate positions based on the configuration; determining indexes of the set of candidate positions and additional candidate positions based on the configuration; and obtaining the pattern indicating the subset of SSBs transmitted in a set of slots and the set of additional candidate positions in a set of gap slots.
  • the pattern further indicates that a first subset of candidate SSBs with continuous indexes in the subset of candidate SSBs is mapping to a first subset of additional candidate positions with continuous indexes and a second subset of candidate SSBs with continuous indexes in the subset of candidate SSBs is mapping to a second subset of additional candidate positions with continuous indexes.
  • the pattern further indicates that one candidate SSB with an even index in the subset of candidate SSBs is mapped to one additional candidate position with an even index in the set of additional candidate positions.
  • the pattern further indicates that a first subset of candidate SSBs with continuous indexes in the subset of candidate SSBs is mapping to a first subset of additional candidate positions with continuous indexes, a second subset of candidate SSBs with continuous indexes in the subset of candidate SSBs is mapping to a second subset of additional candidate positions with continuous indexes, and one candidate SSB with an even index is mapped to one additional candidate position with an even index.
  • a network device comprises circuitry configured to determine a configuration of a discovery burst transmission window (DBTW) determined based on iterative measurements on a plurality of synchronization signal/physical broadcast channel (SS/PBCH) blocks (SSBs) within a time duration; transmit, to a terminal device, a master information block (MIB) at least indicating the configuration; and transmit, to the terminal device, at least one SSB in the plurality of SSBs based on the configuration.
  • DBTW discovery burst transmission window
  • MIB master information block
  • a terminal device comprises circuitry configured to: determine the number of candidate synchronization signal/physical broadcast channel (SS/PBCH) blocks (SSBs) based on the MIB; and determine an index of a first symbol of the candidate SSBs.
  • SS/PBCH candidate synchronization signal/physical broadcast channel
  • the terminal device comprises circuitry configured to determine an index of a first symbol of the candidate SSBs by determining the index of the first symbol based on ⁇ 4, 8, 16, 20 ⁇ +28*n, wherein n is one from ⁇ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 ⁇ or one from ⁇ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 ⁇ .
  • a network device comprises circuitry configured to determine the configuration by classifying the plurality of SSBs into a plurality of classes; for each class in the plurality of classes, iteratively performing the following until a condition is fulfilled: performing the measurement with a predetermined periodicity; comparing a result of the measurement with a threshold result; and reclassifying the plurality of SSBs based on the comparison; and determining the configuration based on the iterations.
  • the condition comprises one of: the number of total classes exceeding a first number, the number of classes comprising a predetermined number of SSBs exceeding a second number, the number of total classes below a third number, the number of the iterations exceeding a fourth number, or a duration for the iterations exceeding a threshold duration.
  • the network device comprises circuitry configured to determine the configuration by in accordance with a determination that the number of total classes exceeds a first number, and the number of classes comprising a predetermined number of SSBs exceeds a second number, determining that DBTW is enabled for the plurality of SSBs.
  • the network device comprises circuitry configured to determine the configuration by in accordance with a determination that the number of total classes is below a third number, determining that DBTW is disabled for the plurality of SSBs.
  • the network device comprises circuitry configured to determine the configuration by in accordance with a determination that the number of total classes is above a third number and below a first number, determining that DBTW is enabled for a subset of SSBs.
  • the measurement comprises one of: a listen-before-talk measurement, a received signal strength indicator measurement, or a channel occupancy measurement.
  • various embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects 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. While various aspects of embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representation, it will be appreciated that the blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
  • the present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer readable storage medium.
  • the computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target real or virtual processor, to carry out the process or method as described above with reference to any of Figs. 4-10.
  • program modules include routines, programs, libraries, objects, classes, components, data structures, or the like that perform particular tasks or implement particular abstract data types.
  • the functionality of the program modules may be combined or split between program modules as desired in various embodiments.
  • Machine-executable instructions for program modules may be executed within a local or distributed device. In a distributed device, program modules may be located in both local and remote storage media.
  • Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions/operations specified in the flowcharts and/or block diagrams to be implemented.
  • the program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
  • the above program code may be embodied on a machine readable medium, which may be any tangible medium that may contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
  • the machine readable medium may be a machine readable signal medium or a machine readable storage medium.
  • a machine readable medium may include but not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing.
  • machine readable storage medium More specific examples of the machine readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM) , a read-only memory (ROM) , an erasable programmable read-only memory (EPROM or Flash memory) , an optical fiber, a portable compact disc read-only memory (CD-ROM) , an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
  • RAM random access memory
  • ROM read-only memory
  • EPROM or Flash memory erasable programmable read-only memory
  • CD-ROM portable compact disc read-only memory
  • magnetic storage device or any suitable combination of the foregoing.

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

Abstract

Des modes de réalisation de la présente divulgation se rapportent aux communications. Selon des modes de réalisation de la présente divulgation, un dispositif terminal reçoit un bloc d'informations maître (MIB) provenant d'un dispositif de réseau. Le MIB indique au moins une configuration d'une fenêtre de transmission par rafales de découverte (DBTW) pour une pluralité de blocs de signal de synchronisation/canal de diffusion physique(SS/PBCH) (SSB). Le dispositif terminal détermine un motif pour la transmission SSB sur la base de la configuration. Le dispositif terminal reçoit au moins un SSB dans la pluralité de SSB provenant du dispositif de réseau sur la base du motif. De cette manière, il permet une activation/désactivation de la DBTW par faisceau ou par cellule. En outre, il permet une utilisation efficace du temps d'occupation de canal.
PCT/CN2021/084854 2021-04-01 2021-04-01 Procédés, dispositifs, et support lisible par ordinateur de communication WO2022205280A1 (fr)

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PCT/CN2021/084854 WO2022205280A1 (fr) 2021-04-01 2021-04-01 Procédés, dispositifs, et support lisible par ordinateur de communication
JP2023560827A JP2024511678A (ja) 2021-04-01 2021-04-01 通信の方法、装置及びコンピュータ可読媒体

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200187302A1 (en) * 2018-12-11 2020-06-11 Samsung Electronics Co., Ltd. Method and apparatus for timing configuration of discovery signal and channel
WO2020167051A1 (fr) * 2019-02-15 2020-08-20 엘지전자 주식회사 Procédé d'émission/de réception de signaux dans un système de communication sans fil et dispositif le prenant en charge
US20200304260A1 (en) * 2019-03-22 2020-09-24 Samsung Electronics Co., Ltd. Method and apparatus for csi-rs enhancement for nr unlicensed spectrum
WO2020201143A1 (fr) * 2019-03-29 2020-10-08 Telefonaktiebolaget Lm Ericsson (Publ) Gestion de transmissions dans la fenêtre de transmission de rafales de découverte de cellules de desserte (dbt)
WO2021037247A1 (fr) * 2019-08-30 2021-03-04 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Appareil et procédé de traitement de collision entre une transmission de ssb et une transmission périodique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200187302A1 (en) * 2018-12-11 2020-06-11 Samsung Electronics Co., Ltd. Method and apparatus for timing configuration of discovery signal and channel
WO2020167051A1 (fr) * 2019-02-15 2020-08-20 엘지전자 주식회사 Procédé d'émission/de réception de signaux dans un système de communication sans fil et dispositif le prenant en charge
US20200304260A1 (en) * 2019-03-22 2020-09-24 Samsung Electronics Co., Ltd. Method and apparatus for csi-rs enhancement for nr unlicensed spectrum
WO2020201143A1 (fr) * 2019-03-29 2020-10-08 Telefonaktiebolaget Lm Ericsson (Publ) Gestion de transmissions dans la fenêtre de transmission de rafales de découverte de cellules de desserte (dbt)
WO2021037247A1 (fr) * 2019-08-30 2021-03-04 Guangdong Oppo Mobile Telecommunications Corp., Ltd. Appareil et procédé de traitement de collision entre une transmission de ssb et une transmission périodique

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