WO2022205457A1 - Procédés, dispositifs et supports de stockage informatiques permettant une communication - Google Patents

Procédés, dispositifs et supports de stockage informatiques permettant une communication Download PDF

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Publication number
WO2022205457A1
WO2022205457A1 PCT/CN2021/085405 CN2021085405W WO2022205457A1 WO 2022205457 A1 WO2022205457 A1 WO 2022205457A1 CN 2021085405 W CN2021085405 W CN 2021085405W WO 2022205457 A1 WO2022205457 A1 WO 2022205457A1
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WIPO (PCT)
Prior art keywords
slot
time
monitoring capability
terminal device
boundary
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PCT/CN2021/085405
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English (en)
Inventor
Gang Wang
Lin Liang
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Nec Corporation
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Priority to JP2023560857A priority Critical patent/JP2024513420A/ja
Priority to PCT/CN2021/085405 priority patent/WO2022205457A1/fr
Publication of WO2022205457A1 publication Critical patent/WO2022205457A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0096—Indication of changes in allocation
    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal

Definitions

  • Embodiments of the present disclosure generally relate to the field of telecommunication, and in particular, to methods, devices and computer storage media for control channel monitoring.
  • NR New Radio
  • FR2 Frequency Range two
  • SCS subcarrier spacing
  • s maximum bandwidth
  • example embodiments of the present disclosure provide methods, devices and computer storage media for control channel monitoring.
  • a method of communication comprises determining, at a terminal device, a target time for a switch from a first group of search space sets to a second group of search space sets based on a reference time associated with an indication indicating the switch, at least one of the first and second groups corresponding to a monitoring capability defined over a plurality of slots; and starting, at the target time, monitoring a control channel from a network device to the terminal device according to the second group of search space sets, monitoring of the control channel according to the first group of search space sets being stopped.
  • a communication method comprises generating, at a network device, an indication indicating a switch from a first group of search space sets to a second group of search space sets, at least one of the first and second groups corresponding to a monitoring capability defined over a plurality of slots; and transmitting, to a terminal device, a medium access control, MAC, control element, CE, comprising the indication.
  • a communication method comprises generating, at a network device, an indication indicating a switch from a first group of search space sets to a second group of search space sets, at least one of the first and second groups corresponding to a monitoring capability defined over a plurality of slots; and transmitting, to a terminal device, downlink control information comprising the indication, the downlink control information scheduling at least one data transmission.
  • a terminal device comprising a processor and a memory.
  • the memory is coupled to the processor and stores instructions thereon. The instructions, when executed by the processor, cause the terminal device to perform the method according to the first aspect of the present disclosure.
  • a network device comprising a processor and a memory.
  • the memory is coupled to the processor and stores instructions thereon. The instructions, when executed by the processor, cause the network device to perform the method according to the second aspect of the present disclosure or the third aspect of the present disclosure.
  • a computer readable medium having instructions stored thereon.
  • the instructions when executed on at least one processor, cause the at least one processor to perform the method according to the first aspect of the present disclosure.
  • a computer readable medium having instructions stored thereon.
  • the instructions when executed on at least one processor, cause the at least one processor to perform the method according to the second aspect of the present disclosure or the third aspect of the present disclosure.
  • Fig. 1 illustrate an example communication network in which embodiments of the present disclosure can be implemented
  • Fig. 2A illustrates an example of search space set group (SSSG) switch between per-slot monitoring and multi-slot monitoring in accordance with some embodiments of the present disclosure
  • Fig. 2B illustrates another example of SSSG switch between per-slot monitoring and multi-slot monitoring in accordance with some embodiments of the present disclosure
  • Fig. 2C illustrates an example of SSSG switch between a first multi-slot monitoring and a second multi-slot monitoring in accordance with some embodiments of the present disclosure
  • Fig. 2D illustrates an example of SSSG switch between multi-slot monitoring with different periodicities in accordance with some embodiments of the present disclosure
  • Fig. 3A illustrates an example of SSSG switch between per-slot monitoring and multi-slot monitoring triggered by MAC CE
  • Fig. 3B illustrates another example of SSSG switch between per-slot monitoring and multi-slot monitoring triggered by MAC CE in accordance with some embodiments of the present disclosure
  • Fig. 3C illustrates an example of SSSG switch between multi-slot monitoring with different periodicity triggered by MAC CE in accordance with some embodiments of the present disclosure
  • Fig. 3D illustrates an example of SSSG switch between per-slot monitoring and multi-slot monitoring triggered by MAC CE in accordance with some embodiments of the present disclosure
  • Fig. 3E illustrates another example of SSSG switch between per-slot monitoring and multi-slot monitoring triggered by MAC CE in accordance with some embodiments of the present disclosure
  • Fig. 4A illustrates an example of SSSG switch triggered by downlink control information (DCI) scheduling downlink transmission in accordance with some embodiments of the present disclosure
  • Fig. 4B illustrates another example of SSSG switch triggered by DCI scheduling downlink transmission in accordance with some embodiments of the present disclosure
  • Fig. 4C illustrates an example of SSSG switch triggered by DCI scheduling uplink transmission in accordance with some embodiments of the present disclosure
  • Fig. 5 illustrates a flowchart of an example method in accordance with some embodiments of the present disclosure
  • Fig. 6 illustrates a flowchart of an example method in accordance with some embodiments of the present disclosure
  • Fig. 7 illustrates a flowchart of an example method in accordance with some embodiments of the present disclosure.
  • Fig. 8 is a simplified block diagram of a device that is suitable for implementing embodiments of the present disclosure.
  • the term “network device” or “base station” 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, 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, and the like.
  • terminal device refers to any device having wireless or wired communication capabilities.
  • 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
  • PDAs personal digital assistants
  • IoT internet of things
  • IoE Internet of Everything
  • MTC machine type communication
  • X means pedestrian, vehicle, or infrastructure/network
  • 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.
  • 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 (memories) 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 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 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.
  • the information may be transmitted via any of the following: Radio Resource Control (RRC) signaling, Medium Access Control (MAC) control element (CE) or Downlink Control Information (DCI) .
  • RRC Radio Resource Control
  • MAC Medium Access Control
  • CE Control element
  • DCI Downlink Control Information
  • a monitoring capability defined over a single slot is referred to as a per-slot monitoring capability or a per-slot PDCCH monitoring capability.
  • a monitoring capability defined over a plurality of slots is referred to as a multi-slot monitoring capability or a multi-slot PDCCH monitoring capability.
  • a 2-slot monitoring capability refers to a monitoring capability defined over two slots.
  • a 4-slot monitoring capability refers to a monitoring capability defined over four slots.
  • Different monitoring capabilities may refer to different multi-slot monitoring capabilities which are defined over different numbers of slots.
  • different monitoring capabilities may refer to the per-slot monitoring capability and the multi-slot monitoring capability.
  • different monitoring capabilities may refer to the 2-slot monitoring capability and the 4-slot monitoring capability.
  • Fig. 1 shows an example communication network 100 in which embodiments of the present disclosure can be implemented.
  • the network 100 includes a network device 110, a terminal device 120 served by the network device 110.
  • the serving area of the network device 110 is called as a cell 102.
  • the network 100 may include any suitable number of network devices and terminal devices adapted for implementing embodiments of the present disclosure. Although not shown, it would be appreciated that one or more terminal devices may be in the cell 102 and served by the network device 110.
  • the network device 110 can communicate/transmit data and control information to the terminal device 120 and the terminal device 120 can also communicate/transmit data and control information to the network device 110.
  • a link from the network device 110 to the terminal device 120 is referred to as a downlink (DL)
  • a link from the terminal device 120 to the network device 110 is referred to as an uplink (UL) .
  • the network 100 may be a Code Division Multiple Access (CDMA) network, a Time Division Multiple Address (TDMA) network, a Frequency Division Multiple Access (FDMA) network, an Orthogonal Frequency-Division Multiple Access (OFDMA) network, a Single Carrier-Frequency Division Multiple Access (SC-FDMA) network or any others.
  • Communications discussed in the network 100 may use conform to any suitable standards including, but not limited to, 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.
  • LTE Long Term Evolution
  • LTE-Evolution LTE-Advanced
  • WCDMA Wideband Code Division Multiple Access
  • CDMA Code Division Multiple Access
  • CDMA2000 Code Division Multiple Access 2000
  • GSM Global System for Mobile Communications
  • the communications may be performed according to any generation communication protocols either currently known or to be developed in the future.
  • Examples of the communication protocols include, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the fifth generation (5G) 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. For clarity, certain aspects of the techniques are described below for LTE, and LTE terminology is used in much of the description below.
  • the network device 110 may transmit control information on a PDCCH to the terminal device 120.
  • the terminal device 120 may monitor the PDCCH for the control information.
  • the PDCCH monitoring is performed based on search space sets (SSS) of a search space set group (SSSG) , a PDCCH monitoring periodicity, a PDCCH monitoring pattern and a PDCCH monitoring capability for example as configured or indicated by the network device 110.
  • SSS search space sets
  • SSSG search space set group
  • PDCCH monitoring periodicity a search space set group
  • PDCCH monitoring pattern for example as configured or indicated by the network device 110.
  • new higher SCS e.g., 480 kHz or 960 kHz is specified.
  • SCS 480 kHz or 960 kHz
  • SCS 960 kHz
  • symbol and slot duration for 480 kHz SCS and 960 kHz SCS is shorter than that for 120 kHz SCS accordingly.
  • the maximum number of blind decoding (BD) or control channel elements (CCE) supported per slot may be too small, which would increase the burden of scheduling.
  • the UE PDCCH processing capabilities in the number of blind decodes and the number of channel estimation CCEs per slot decrease exponentially with the numerologies.
  • multi-slot PDCCH monitoring and multi-slot PDCCH monitoring capability for 480 kHz SCS and 960 kHz SCS. It has also been discussed to support per-slot PDCCH monitoring capability for 480 kHz SCS and 960 kHz SCS as well.
  • no detail about SSSG switch in the presence of the multi-slot PDCCH monitoring capability is specified.
  • the SSSG switch involves switch between the per-slot PDCCH monitoring capability and the multi-slot PDCCH monitoring capability, how to determine timing of the SSSG switch is not specified.
  • the SSSG switching involves switch between the different multi-slot PDCCH monitoring capabilities, how to determine timing of the SSSG switch is not specified as well.
  • the frequency domain and time duration (in number of symbols) resources for PDCCH monitoring are defined as a control resource set (CORESET) .
  • the configuration of the CORESET may be configured to the terminal device 120 via higher layer signaling, for example, via Radio Resource Control (RRC) signaling in the information element (IE) ControlResourceSet.
  • RRC Radio Resource Control
  • the IE ControlResourceSet is used to configure a time/frequency resource in which to search for DCI.
  • the slots and starting symbol within a search space set for PDCCH monitoring are defined as a search space (SS) .
  • the configuration of the SS may be configured to the terminal device 120 via higher layer signaling, for example, via RRC signaling in the IE SearchSpace.
  • the IE SearchSpace defines how/where to search for PDCCH candidates.
  • Each search space is associated with one CORESET, while a CORESET may be associated with more than one search space.
  • the terminal device 120 may be configured with a plurality of SSSGs, which may be referred to as a “group” for short.
  • Each SSSG comprises at least one search space set and is associated with a specific monitoring capability.
  • a SSSG with a group index A may be associated with the per-slot monitoring capability
  • another SSSG with a group index B may be associated with the multi-slot monitoring capability (such as 2-slot or 4-slot monitoring capability) .
  • the multi-slot monitoring capability may be defined in different manners.
  • the multi-slot monitoring capability may be defined over a slot group with a fixed pattern of N slots. For example, for 480 kHz SCS, N may be set to 4 while for 960 kHz, N may be set to 8. That is, the terminal device 120 may be configured to monitor the PDCCH from the network device 110 with the monitoring capability defined over a slot group with a fixed pattern of 4 slots (for 480 kHz) or 8 slots (for 960 kHz) .
  • the multi-slot monitoring capability may be defined over a span with a first number of consecutive symbols or slots.
  • the terminal device 120 is configured to monitor the PDCCH over the first number of consecutive symbols or slots.
  • An interval between two consecutive spans comprises a second number of consecutive symbols or slots.
  • Such a span is also referred to as a (X, Y) span pattern.
  • X represents that an interval between two consecutive spans comprises X number of consecutive symbols or slots.
  • X represents the minimum separation between the first symbol of two consecutive spans.
  • Y represents the maximum number of consecutive symbols or slots comprised in a span. For example, if the monitoring capability is defined over a (56, 3) span, the terminal device 120 may monitor up to 3 consecutive symbols within a span, and the minimum internal between two consecutive spans comprises 56 symbols (i.e., 4 slots) .
  • the multi-slot monitoring capability may be defined over a sliding window with a predetermined number of slots.
  • the terminal device 120 may be configured to monitor a predetermined number of consecutive symbols or slots within a window and two consecutive windows comprise several overlapped symbols or slots.
  • the terminal device 120 can be configured to monitor PDCCH according to different SSSGs.
  • the terminal device 120 may be monitoring PDCCH according to a SSSG, which may be referred to as a first group of search space sets hereinafter.
  • the terminal device 120 is indicated to switch to monitor PDCCH according to another SSSG, which may be referred to as a second group of search space sets hereinafter.
  • At least one of the first and second groups is associated with a multi-slot monitoring capability.
  • the terminal device 120 needs to determine timing of the SSSG switch. For example, the terminal device 120 may determine a target time for the switch between the first group of search space sets and the second group of search space sets. The target time may be determined by the terminal device 120 based on a reference time associated with an indication indicating the switch.
  • an explicit or implicit indication of SSSG switch may be used.
  • the explicit indication may be included in control information from the network device 110.
  • the reference time is a reception time of the control information comprising the indication.
  • the explicit indication may be a SSSG switching flag field in non-scheduling DCI (e.g., DCI format 2_0) received from the network device 110. Accordingly, the reference time is a reception time of the DCI format 2_0.
  • the implicit indication may be a timer indicating the switch. Accordingly, the reference time is an expiration time of the timer. A value of the timer may be decreased in terms of slot or slot group. In other words, the terminal device 120 may decrement the timer value by one after each slot or after each slot group. Alternatively, or in addition, the implicit indication may be a last symbol of a remaining channel occupancy time for the serving cell that is indicated by DCI format 2_0. Alternatively or in addition, the implicit indication may be an implicit SSSG switch triggered by a scheduling request (SR) or a random access channel (RACH) . In this case, the reference time may be any suitable time associated with the SR or RACH. It would be appreciated that the indication for SSSG switch may be configured be any other suitable resources received from the network device 110.
  • SR scheduling request
  • RACH random access channel
  • Fig. 2A illustrates an example of SSSG switch between per-slot monitoring and multi-slot monitoring in accordance with some embodiments of the present disclosure.
  • the terminal device 120 may determine the target time for the SSSG switch based on the reference time associated with the explicit or implicit indication.
  • the terminal device 120 monitors PDCCH according to first search space sets initially.
  • the first search space sets may have a group index 0 for example and be associated with the per-slot monitoring capability.
  • the terminal device 120 determines an explicit or implicit indication for the SSSG switch. For example, the terminal device 120 receives a DCI format 2_0 from the network device 110.
  • the indication indicates the terminal device 120 to monitor PDCCH according to second search space sets.
  • the second search space sets may have a group index 1 for example and be associated with the multi-slot monitoring capability, which is 4-slot monitoring capability in the example.
  • the terminal device 120 may determine a target time for a switch from the first search space sets to the second search space sets based on the reference time which is the slot 210-1 and a switch delay.
  • the switch delay for example, P switch symbols, may be predefined or predetermined.
  • the multi-slot monitoring capability is defined over a slot group with a fixed pattern of N slots and N is set to 4 for 480 kHz. Accordingly, the terminal device 120 may determine a boundary of a slot group corresponding to the multi-slot monitoring capability. The boundary is spaced from the reference time by at least the switch delay. The boundary of the slot group is determined as the target time.
  • the terminal device 120 may determine that the boundary of the slot group corresponding to the multi-slot monitoring capability is located at slot 215-1 with slot index 8, and determine the boundary slot 215-1 as the target time. Accordingly, at the slot 215-1, the terminal device 120 may start monitoring PDCCH according to the second search space sets and stop monitoring PDCCH according to the first search space sets.
  • the terminal device 120 if the terminal device 120 receives an explicit or implicit indication of SSSG switch, the terminal device 120 starts monitoring PDCCH according to the second search space sets with group index 1, and stops monitoring PDCCH according to the first search space sets with group index 0, for the serving cell at a first slot group that is at least P switch symbols after the last symbol (slot) of the explicit or implicit indication.
  • the terminal device 120 continues monitoring PDCCH according to the second search space sets since slot 215-1. Then, at slot 225-1 with a slot index 16, the terminal device 120 determines an explicit or implicit indication for a SSSG switch. For example, the terminal device 120 receives a DCI format 2_0 from the network device 110. The indication indicates the terminal device 120 to monitor PDCCH according to the first search space sets. As aforementioned, the first search space sets may have a group index 0 for example and be associated with the per-slot monitoring capability. In response to determining the indication, the terminal device 120 may determine a target time for a switch from the second search space sets to the first search space sets based on the reference time and the switch delay, for example, P switch symbols.
  • the terminal device 120 may determine a target time for a switch from the second search space sets to the first search space sets based on the reference time and the switch delay, for example, P switch symbols.
  • the terminal device 120 may determine a boundary of a slot group corresponding to the multi-slot monitoring capability.
  • the boundary is spaced from the reference time by at least the switch delay.
  • the boundary of the slot group is determined as the target time.
  • the terminal device 120 may determine that the boundary of the slot group corresponding to the multi-slot monitoring capability is located at slot 230-1 with a slot index 20, and determine the boundary slot 230-1 as the target time. Accordingly, at the slot 230-1, the terminal device 120 may start monitoring PDCCH according to the first search space sets and stop monitoring PDCCH according to the second search space sets.
  • the terminal device 120 if the terminal device 120 receives an explicit or implicit indication of SSSG switch, the terminal device 120 starts monitoring PDCCH according to the first search space sets with the group index 0, and stops monitoring PDCCH according to the second search space sets with the group index 1, for the serving cell at a first slot group that is at least P switch symbols after the last symbol (slot) of the explicit or implicit indication.
  • the first search space sets are associated with the per-slot monitoring capability
  • the second search space sets are associated with the multi-slot monitoring capability.
  • the per-slot monitoring capability and the multi-slot monitoring capability are also switched at the target time.
  • the per-slot monitoring capability is switched to the multi-slot monitoring capability at slot 215-1
  • the multi-slot monitoring capability is switched to the per-slot monitoring capability at slot 230-1. Therefore, slot 215-1 and slot 230-1 are switching points both for SSSG and monitoring capability. By aligning the switching point with the slot group boundary, mixing of different monitoring capabilities can be avoided.
  • the terminal device 120 may determine that a slot group boundary exists in a slot with number in a frame with number n f if the equation is satisfied, where N is the slot number in the fixed pattern slot group.
  • the above equation can be simplified as wherein is slot index in a subframe.
  • the slot boundary of 120kHz can be a reference for the slot group boundary of 480 kHz and 960 kHz.
  • Fig. 2B illustrates another example of SSSG switch between per-slot monitoring and multi-slot monitoring in accordance with some embodiments of the present disclosure.
  • the terminal device 120 may determine the target time for the SSSG switch based on the reference time associated with the explicit or implicit indication.
  • the terminal device 120 monitors PDCCH according to first search space sets initially.
  • the first search space sets may have a group index 0 for example and be associated with the per-slot monitoring capability.
  • the terminal device 120 determines an explicit or implicit indication for a SSSG switch. For example, the terminal device 120 receives a DCI format 2_0 from the network device 110.
  • the indication indicates the terminal device 120 to monitor PDCCH according to second search space sets.
  • the second search space sets may have a group index 1 for example and be associated with the multi-slot monitoring capability, which is 4-slot monitoring capability in the example.
  • the terminal device 120 may determine a target time for a switch from the first search space sets to the second search space sets based on the reference time which is the slot 210-2 in this example and the switch delay.
  • the multi-slot monitoring capability is defined over a (X, Y) span or over a sliding window.
  • the terminal device 120 may determine a boundary of a (X, Y) span or a sliding window corresponding to the multi-slot monitoring capability. The boundary is spaced from the reference time by at least the switch delay. The boundary is determined as the target time.
  • the terminal device 120 may determine that the boundary of the span (X, Y) span or the sliding window corresponding to the multi-slot monitoring capability is located at slot 215-2 with a slot index 6, and determine the boundary slot 215-2 as the target time. Accordingly, at the slot 215-2, the terminal device 120 may start monitoring PDCCH according to the second search space sets and stop monitoring PDCCH according to the first search space sets.
  • the terminal device 120 if the terminal device 120 receives an explicit or implicit indication of SSSG switch, the terminal device 120 starts monitoring PDCCH according to the second search space sets with group index 1, and stops monitoring PDCCH according to the first search space sets with group index 0, for the serving cell at a first span boundary or a first sliding window boundary that is at least P switch symbols after the last symbol (slot) of the explicit or implicit indication.
  • the terminal device 120 may determine a boundary of a slot corresponding to the per-slot monitoring capability. The boundary is spaced from the reference time by the switch delay. The boundary of the slot is determined as the target time. As shown in Fig. 2B, the terminal device 120 may determine that the boundary of the slot corresponding to the per-slot monitoring capability is located at slot 220-2 with a slot index 5 (shown with the dotted arrow in Fig. 2B) . Accordingly, at the slot 220-2, the terminal device 120 may start monitoring PDCCH according to the second search space sets and stop monitoring PDCCH according to the first search space sets.
  • the terminal device 120 if the terminal device 120 receives an explicit or implicit indication of SSSG switch, the terminal device 120 starts monitoring PDCCH according to the second search space sets with group index 1, and stops monitoring PDCCH according to the first search space sets with group index 0, for the serving cell at a first slot that is at least P switch symbols after the last symbol (slot) of the explicit or implicit indication.
  • the first search space sets are associated with the per-slot monitoring capability
  • the second search space sets are associated with the multi-slot monitoring capability defined over the (X, Y) span or the sliding window. Due to the characteristics of the (X, Y) span or the sliding window, the switching point may not be aligned with the boundary of the (X, Y) span or the sliding window for a switch from the per-slot monitoring capability to the multi-slot monitoring capability. In this case, even if the switching point is not aligned with the boundary, mixing of different monitoring capabilities can be avoided.
  • the terminal device 120 continues monitoring PDCCH according to the second search space sets since slot 215-2. Then, at slot 225-2 with a slot index 18, the terminal device 120 determines an explicit or implicit indication for the SSSG switch. For example, the terminal device 120 receives a DCI format 2_0 from the network device 110. The indication indicates the terminal device 120 to monitor PDCCH according to the first search space sets. As aforementioned, the first search space sets may have the group index 0 for example and be associated with the per-slot monitoring capability. In response to determining the indication, the terminal device 120 may determine a target time for a switch from the second search space sets to the first search space sets based on the reference time which is the slot 225-2 in this example and the switch delay, for example, P switch symbols.
  • the terminal device 120 may determine a target time for a switch from the second search space sets to the first search space sets based on the reference time which is the slot 225-2 in this example and the switch delay, for example, P switch symbols.
  • the terminal device 120 may determine a boundary of a (X, Y) span or a sliding window corresponding to the multi-slot monitoring capability.
  • the boundary is spaced from the reference time by at least the switch delay.
  • the boundary is determined as the target time.
  • the terminal device 120 may determine that the boundary of the (X, Y) span or the sliding window corresponding to the multi-slot monitoring capability is located at slot 230-2 with a slot index 22, and determine the boundary slot 230-2 as the target time.
  • the slot 230-2 is spaced from the first symbol of last span or last sliding window by X symbols (slots) . Accordingly, at the slot 230-2, the terminal device 120 may start monitoring PDCCH according to the first search space sets and stop monitoring PDCCH according to the second search space sets.
  • the terminal device 120 if the terminal device 120 receives an explicit or implicit indication of SSSG switch, the terminal device 120 starts monitoring PDCCH according to the first search space sets with the group index 0, and stops monitoring PDCCH according to the second search space sets with the group index 1, for the serving cell at a first slot that is at least P switch symbols after the last symbol (slot) of the explicit or implicit indication, and this first slot is time separation of X symbols (slots) from the first symbol of last span or last sliding window.
  • the first search space sets are associated with the per-slot monitoring capability
  • the second search space sets are associated with the multi-slot monitoring capability.
  • the per-slot monitoring capability and the multi-slot monitoring capability are switched with each other at the target time.
  • the per-slot monitoring capability is switched to the multi-slot monitoring capability at slot 215-2
  • the multi-slot monitoring capability is switched to the per-slot monitoring capability at slot 230-2. Therefore, slot 215-2 and slot 230-2 are switching points both for SSSG and monitoring capability. By aligning the switching point with the span or sliding window boundary, mixing of different monitoring capabilities can be avoided.
  • Fig. 2C illustrates an example of SSSG switch between a first multi-slot monitoring and a second multi-slot monitoring in accordance with some embodiments of the present disclosure.
  • the terminal device 120 may determine the target time for the SSSG switch based on the reference time associated with the explicit or implicit indication.
  • the terminal device 120 monitors PDCCH according to first search space sets initially.
  • the first search space sets may have a group index 0 for example and be associated with a first multi-slot monitoring capability, which is 2-slot monitoring capability in this example.
  • the terminal device 120 determines an explicit or implicit indication for the SSSG switch. For example, the terminal device 120 receives a DCI format 2_0 from the network device 110.
  • the indication indicates the terminal device 120 to monitor PDCCH according to second search space sets.
  • the second search space sets may have a group index 1 for example and be associated with a second multi-slot monitoring capability, which is 4-slot monitoring capability in the example.
  • the terminal device 120 may determine a target time for a switch from the first search space sets to the second search space sets based on the reference time which is the slot 210-3 and the switch delay, for example, P switch symbols.
  • the first multi-slot monitoring capability is defined over a first (X, Y) span or over a first sliding window.
  • the second multi-slot monitoring capability is defined over a second (X, Y) span or over a second sliding window.
  • the terminal device 120 may determine a boundary of the first (X, Y) span or the first sliding window corresponding to the first multi-slot monitoring capability.
  • the boundary is spaced from the reference time by at least the switch delay.
  • the boundary of is determined as the target time.
  • the terminal device 120 may determine that the boundary of the first (X, Y) span or the first sliding window corresponding to the 2-slot monitoring capability is located at slot 215-3 with a slot index 6, and determine the boundary slot 215-3 as the target time. Accordingly, at the slot 215-3, the terminal device 120 may start monitoring PDCCH according to the second search space sets and stop monitoring PDCCH according to the first search space sets.
  • the terminal device 120 if the terminal device 120 receives an explicit or implicit indication of SSSG switch, the terminal device 120 starts monitoring PDCCH according to the second search space sets with group index 1, and stops monitoring PDCCH according to the first search space sets with group index 0, for the serving cell at a first span boundary or a first sliding window boundary that is at least P switch symbols after the last symbol (slot) of the explicit or implicit indication.
  • the first span boundary or the first sliding window boundary corresponds to the first multi-slot monitoring capability.
  • the terminal device 120 continues monitoring PDCCH according to the second search space sets since slot 215-3. Then, at slot 225-3 with a slot index 26, the terminal device 120 determines an explicit or implicit indication for the SSSG switch. For example, the terminal device 120 receives a DCI format 2_0 from the network device 110. The indication indicates the terminal device 120 to monitor PDCCH according to the first search space sets. As aforementioned, the first search space sets may have the group index 0 for example and be associated with the first multi-slot monitoring capability. In response to determining the indication, the terminal device 120 may determine a target time for a switch from the second search space sets to the first search space sets based on the reference time which is the slot 225-3 and the switch delay, for example, P switch symbols.
  • the terminal device 120 may determine a target time for a switch from the second search space sets to the first search space sets based on the reference time which is the slot 225-3 and the switch delay, for example, P switch symbols.
  • the terminal device 120 may determine a boundary of the second (X, Y) span or the second sliding window corresponding to the second multi-slot monitoring capability.
  • the boundary is spaced from the reference time by at least the switch delay.
  • the boundary is determined as the target time.
  • the terminal device 120 may determine that the boundary of the second (X, Y) span or the second sliding window corresponding to the second multi-slot monitoring capability is located at slot 230-3 with a slot index 30, and determine the boundary slot 230-3 as the target time.
  • the slot 230-3 is spaced from the first symbol of last span or last sliding window by X symbols (slots) . Accordingly, at the slot 230-3, the terminal device 120 may start monitoring PDCCH according to the first search space sets and stop monitoring PDCCH according to the second search space sets.
  • the terminal device 120 if the terminal device 120 receives an explicit or implicit indication of SSSG switch, the terminal device 120 starts monitoring PDCCH according to the first search space sets with group index 0, and stops monitoring PDCCH according to the second search space sets with group index 1, for the serving cell at a first slot that is at least P switch symbols after the last symbol (slot) of the explicit or implicit indication, and this first slot is time separation of X symbols (slots) from the first symbol of last span or last sliding window.
  • the first search space sets are associated with the 2-slot monitoring capability
  • the second search space sets are associated with the 4-slot monitoring capability.
  • the 2-slot monitoring capability and the 4-slot monitoring capability is switched at the target time.
  • the 2-slot monitoring capability is switched to the 4-slot monitoring capability at slot 215-3
  • the 4-slot monitoring capability is switched to the 2-slot monitoring capability at slot 230-3. Therefore, slot 215-3 and slot 230-3 are switching points both for SSSG and monitoring capability. By aligning the switching point with the span or sliding window boundary, mixing of different multi-slot monitoring capabilities can be avoided.
  • Fig. 2D illustrates an example of SSSG switch between multi-slot monitoring with different periodicities in accordance with some embodiments of the present disclosure.
  • the terminal device 120 may determine the target time for the SSSG switch based on the reference time associated with the explicit or implicit indication.
  • the terminal device 120 monitors PDCCH according to first search space sets initially.
  • the first search space sets may have a group index A for example and be associated with the multi-slot monitoring capability, which is 4-slot monitoring capability in the example.
  • the terminal device 120 determines an explicit or implicit indication for the SSSG switch. For example, the terminal device 120 receives a DCI format 2_0 from the network device 110.
  • the indication indicates the terminal device 120 to monitor PDCCH according to second search space sets.
  • the second search space sets may have a group index B for example and be associated with a same multi-slot monitoring capability (i.e., 4-slot monitoring capability in the example) .
  • the first and second search space sets have different monitoring periodicities.
  • the terminal device 120 may determine a target time for a switch from the first search space sets to the second search space sets based on the reference time which is the slot 210-4 and the switch delay for example, P switch symbols. It is to be understood that the group indices A and B are for the purpose of illustration without any limitation to the protection scope.
  • the multi-slot monitoring capability is defined over a slot group with a fixed pattern of slots. Accordingly, the terminal device 120 may determine a boundary of a slot group corresponding to the multi-slot monitoring capability. The boundary is spaced from the reference time by at least the switch delay. The boundary of the slot group is determined as the target time.
  • the terminal device 120 may determine that the boundary of the slot group corresponding to the multi-slot monitoring capability is located at slot 215-4 with a slot index 8, and determine the boundary slot 215-4 as the target time. Accordingly, at the slot 215-4, the terminal device 120 may start monitoring PDCCH according to the second search space sets and stop monitoring PDCCH according to the first search space sets.
  • the terminal device 120 if the terminal device 120 receives an explicit or implicit indication of SSSG switch, the terminal device 120 starts monitoring PDCCH according to the second search space sets with the group index B, and stops monitoring PDCCH according to the first search space sets with the group index A, for the serving cell at a first slot group boundary that is at least P switch symbols after the last symbol (slot) of the explicit or implicit indication.
  • the terminal device 120 continues monitoring PDCCH according to the second search space sets since the slot 215-4. Then, at slot 225-4 with a slot index 24, the terminal device 120 determines an explicit or implicit indication for the SSSG switch. For example, the terminal device 120 receives a DCI format 2_0 from the network device 110. The indication indicates the terminal device 120 to monitor PDCCH according to the first search space sets. As aforementioned, the first search space sets may have the group index A for example and be associated with the multi-slot monitoring capability same as the second search group set. In response to determining the indication, the terminal device 120 may determine a target time for a switch from the second search space sets to the first search space sets based on the reference time which is the slot 225-4 and the switch delay.
  • the terminal device 120 may determine a boundary of the slot group corresponding to the multi-slot monitoring capability.
  • the boundary is spaced from the reference time by at least the switch delay.
  • the boundary of the slot group is determined as the target time.
  • the terminal device 120 may determine that the boundary of the slot group (or the boundary of the span) corresponding to the multi-slot monitoring capability is located at slot 230-4 with a slot index 28, and determine the boundary slot 230-4 as the target time. Accordingly, at the slot 230-4, the terminal device 120 may start monitoring PDCCH according to the first search space sets and stop monitoring PDCCH according to the second search space sets.
  • the terminal device 120 if the terminal device 120 receives an explicit or implicit indication of SSSG switch, the terminal device 120 starts monitoring PDCCH according to the first search space sets with group index A, and stops monitoring PDCCH according to the second search space sets with group index B, for the serving cell at a first slot group boundary that is at least P switch symbols after the last symbol (slot) of the explicit or implicit indication.
  • Fig. 2D The above example of Fig. 2D is described with respect to the case where the multi-slot monitoring capability is defined over the slot group. However, this is merely for the purpose of illustration without any limitation to the protection scope. In the case where the multi-slot monitoring capability is defined over the (X, Y) span or the sliding window, a (X, Y) span boundary or a sliding window boundary can be determined as the target time in a similar manner.
  • the target time for SSSG switch may be aligned with a slot group boundary, a (X, Y) span boundary or a sliding window boundary via a predefined switch delay.
  • the terminal device 120 may determine a target slot spaced from the reference time by at least a predefined switch delay.
  • the predefined switch delay (referred to as P switch ) may be properly predefined such that the target slot is aligned with a boundary of a time period for defining the monitoring capability.
  • the time period may be one of a slot group, a (X, Y) span or a sliding window.
  • the exemplary minimum P switch values are shown in Table 1 below.
  • ⁇ represents a corresponding SCS.
  • the values of L, X, Y and Z may be calculated in a similar way.
  • the multi-slot monitoring capability may be defined over a (56, 3) span.
  • M may be set to 53 which can ensure that the target time is aligned with a boundary of the (56, 3) span.
  • the terminal device 120 may determine the target time aligned with the slot group boundary or a (X, Y) span boundary or a sliding window boundary based on a proper predefined switch time delay (P switch ) .
  • a search space set can be a common search space (CSS) set or a special search space (USS) set.
  • the terminal device 120 may monitor PDCCH in one or more of the following search spaces sets:
  • Type0-PDCCH CSS set configured by pdcch-ConfigSIB1 in MIB or by searchSpaceSIB1 in PDCCH-ConfigCommon or by searchSpaceZero in PDCCH-ConfigCommon for a DCI format with CRC scrambled by a SI-RNTI on the primary cell of the MCG;
  • Type0A-PDCCH CSS set configured by searchSpaceOtherSystemInformation in PDCCH-ConfigCommon for a DCI format with CRC scrambled by a SI-RNTI on the primary cell of the MCG;
  • Type1-PDCCH CSS set configured by ra-SearchSpace in PDCCH-ConfigCommon for a DCI format with CRC scrambled by a RA-RNTI, a MsgB-RNTI, or a TC-RNTI on the primary cell;
  • Type2-PDCCH CSS set configured by pagingSearchSpace in PDCCH-ConfigCommon for a DCI format with CRC scrambled by a P-RNTI on the primary cell of the MCG;
  • searchSpaceType ue-Specific for DCI formats with CRC scrambled by C-RNTI, MCS-C-RNTI, SP-CSI-RNTI, CS-RNTI (s) , SL-RNTI, SL-CS-RNTI, or SL Semi-Persistent Scheduling V-RNTI.
  • search space (SS) type of SSSG should be all the above SS types when switching between per-slot monitoring and multi-slot monitoring.
  • SS type of SSSG may not be limited to the Type3-PDCCH CSS set or the USS set. Instead, all the above SS types may be supported.
  • the terminal device 120 may be configured to support a dynamic SSSG switch triggered by a MAC CE included in the physical downlink shared channel (PDSCH) .
  • An indication indicating the SSSG switch may be included in the MAC CE.
  • the reference time is a transmission time of the acknowledgement (ACK) to the MAC CE.
  • the reference time is the time at which the terminal device 120 transmits the ACK to the network device 110.
  • Fig. 3A illustrates an example of SSSG switch between per-slot monitoring and multi-slot monitoring triggered by MAC CE in accordance with some embodiments of the present disclosure.
  • the terminal device 120 may determine the target time for the SSSG switch based on the transmission time of the ACK to the MAC CE.
  • the terminal device 120 monitors PDCCH according to first search space sets initially.
  • the first search space sets may have a group index 0 for example and be associated with the per-slot monitoring capability.
  • the terminal device 120 receives the MAC CE in the PDSCH from the network device 110.
  • the MAC CE comprises an indication indicating the terminal device 120 to monitor PDCCH according to second search space sets.
  • the second search space sets may have a group index 1 for example and be associated with the multi-slot monitoring capability, which is 4-slot monitoring capability in the example.
  • the terminal device 120 may determine a target time for a switch from the first search space sets to the second search space sets based on the transmission time of the ACK and a processing delay.
  • the processing delay for example, Q symbols, may be predefined or predetermined.
  • the processing delay Q may be related to the processing capability of the network device 110.
  • the multi-slot monitoring capability is defined over a slot group with a fixed pattern of N slots and N is set to 4 for 480 kHz. Accordingly, the terminal device 120 may determine a boundary of a slot group corresponding to the multi-slot monitoring capability. The boundary is spaced from the transmission time of the ACK by at least the processing delay. The boundary of the slot group is determined as the target time.
  • the terminal device 120 may determine that the ACK to the MAC CE is transmitted at slot 315-1 with a slot index j (j is equal to 9 in this case) .
  • k represents the time from the transmission time of the ACK to the nearest slot group boundary.
  • k is equal to 2 slots, which is not less than the predetermined processing delay, which has a length of 2 slots in this case.
  • the boundary spaced from the slot 315-1 by at least the processing delay (2 slots in this case) is slot 320-1 with a slot index 12.
  • the terminal device 120 may determine the boundary of the slot group corresponding to the multi-slot monitoring capability is located at slot 320-1, and determine the boundary slot 320-1 as the target time.
  • the terminal device 120 may start monitoring PDCCH according to the second search space sets and stop monitoring PDCCH according to the first search space sets. It is to be understood that, the above described SSSG switch process may also apply to the switch from the second search space sets to the first search space sets.
  • the first search space sets are associated with the per-slot monitoring capability
  • the second search space sets are associated with the multi-slot monitoring capability.
  • the per-slot monitoring capability and the multi-slot monitoring capability are switched at the target time.
  • the per-slot monitoring capability is switched to the multi-slot monitoring capability at slot 320-1. Therefore, the slot 320-1 is a switching point both for SSSG and monitoring capability.
  • Fig. 3B illustrates another example of SSSG switch between per-slot monitoring and multi-slot monitoring triggered by MAC CE in accordance with some embodiments of the present disclosure.
  • the terminal device 120 may determine the target time for the SSSG switch based on the transmission time of the ACK to the MAC CE.
  • the terminal device 120 monitors PDCCH according to second search space sets initially.
  • the second search space sets may have a group index 1 for example and be associated with the multi-slot monitoring capability, which is 4-slot monitoring capability in the example.
  • the terminal device 120 receives the MAC CE in the PDSCH from the network device 110.
  • An indication indicating the terminal device 120 to monitor PDCCH according to first search space sets is included in the MAC CE.
  • the first search space sets may have a group index 0 for example and be associated with the per-slot monitoring capability.
  • the terminal device 120 may determine a target time for a switch from the second search space sets to the first search space sets based on transmission time of the ACK to the MAC CE and the processing delay.
  • the multi-slot monitoring capability is defined over a slot group with a fixed pattern of N slots and N is set to 4 for 480 kHz. Accordingly, the terminal device 120 may determine a boundary of a slot group corresponding to the multi-slot monitoring capability. The boundary is spaced from the transmission time of the ACK by at least the processing delay Q. The boundary of the slot group is determined as the target time.
  • the terminal device 120 may determine that the ACK to the MAC CE is transmitted at slot 315-2 with a slot index j (which is 10 in this case) .
  • k represents the time from the transmission time of the ACK to the nearest slot group boundary. In this case, k is equal to 1 slot which is less than the predetermined processing delay Q, which has a length of 2 slots in this case.
  • the boundary spaced from the slot 315-2 by at least the processing delay (2 slots in this case) is slot 320-2 with a slot index 16 instead of the slot with a slot index 12.
  • the terminal device 120 may determine the boundary of the slot group corresponding to the multi-slot monitoring capability is located at slot 320-2 with slot index 16, and determine the boundary slot 320-2 as the target time. Accordingly, at the slot 320-2, the terminal device 120 may start monitoring PDCCH according to the first search space sets and stop monitoring PDCCH according to the second search space sets. It is to be understood that, the above described SSSG switch process may also apply to the switch from the first search space sets to the second search space sets.
  • the first search space sets are associated with the per-slot monitoring capability
  • the second search space sets are associated with the multi-slot monitoring capability.
  • the per-slot monitoring capability and the multi-slot monitoring capability are switched at the target time.
  • the multi slot monitoring capability is switched to the per-slot monitoring capability at slot 320-2. Therefore, the slot 320-2 is a switching point both for SSSG and monitoring capability.
  • the terminal device 120 adopts the SSSG switch triggered or indicated by MAC CE after the target time, e.g. slot j + k, where j is the slot index at which the ACK to MAC CE is transmitted to the network deice 110, and k is the time from ACK of PDSCH to the nearest slot group boundary. If k is smaller than Q (Q is a fixed processing delay) , then the target time is aligned to next slot group boundary.
  • Fig. 3C illustrates an example of SSSG switch between multi-slot monitoring with different periodicity triggered by MAC CE in accordance with some embodiments of the present disclosure.
  • the terminal device 120 may determine the target time for the SSSG switch based on the transmission time of the ACK to the MAC CE included in the PDSCH.
  • the terminal device 120 monitors PDCCH according to first search space sets initially.
  • the first search space sets may have a group index A for example and be associated with the multi-slot monitoring capability which is 4-slot monitoring capability in the example.
  • the terminal device 120 receives the MAC CE in the PDSCH from the network device 110.
  • the MAC CE comprises an indication indicating the terminal device 120 to monitor PDCCH according to second search space sets.
  • the second search space sets may have a group index B for example and be associated with a same multi-slot monitoring capability (i.e., 4-slot monitoring capability in the example) .
  • the terminal device 120 may determine a target time for a switch from the first search space sets to the second search space sets based on the transmission time of the ACK and the predetermined processing delay Q. It is to be understood that the group indices A and B are for the purpose of illustration without any limitation to the protection scope.
  • the terminal device 120 may determine that the ACK to the MAC CE is transmitted at slot 315-3 with a slot index j (j is equal to 9 in this case) .
  • k represents the time from the transmission time of the ACK to the nearest slot group boundary. In this case, k is equal to 2 slots, which is not less than the predetermined processing delay, which has a length of 2 slots in this case.
  • the boundary spaced from the slot 315-3 in this case by at least the processing delay (2 slots in this case) is slot 320-3 with a slot index 12.
  • the terminal device 120 may determine the boundary of the slot group corresponding to the multi-slot monitoring capability is located at slot 320-3, and determine the boundary slot 320-3 as the target time. Accordingly, at the slot 320-3, the terminal device 120 may start monitoring PDCCH according to the second search space sets and stop monitoring PDCCH according to the first search space sets.
  • Fig. 3C also shows the SSSG switch from the second search space sets to the first search space sets.
  • the terminal device 120 continues monitoring PDCCH according to the second search space sets since slot 320-3.
  • the terminal device 120 receives the MAC CE in the PDSCH from the network device 110.
  • the MAC CE comprises an indication indicating the terminal device 120 to monitor PDCCH according to the first search space sets. Then, the terminal device 120 may determine the target time for the switch based on the transmission time of the ACK to the MAC CE.
  • the ACK to the MAC CE is transmitted at slot 335-3 with a slot index 37.
  • the time from the transmission time of the ACK to the nearest slot group boundary is equal to 2 slots, which is not less than the predetermined processing delay, which has a length of 2 slots in this case.
  • the boundary spaced from the slot 335-3 by at least the processing delay (2 slots in this case) is slot 340-3 with a slot index 40.
  • the terminal device 120 may determine the boundary of the slot group corresponding to the multi-slot monitoring capability is located at slot 340-3, and determine the boundary slot 340-3 as the target time. Accordingly, at the slot 340-3, the terminal device 120 may start monitoring PDCCH according to the first search space sets and stop monitoring PDCCH according to the second search space sets.
  • Fig. 3D illustrates an example of SSSG switch between per-slot monitoring and multi-slot monitoring triggered by MAC CE in accordance with some embodiments of the present disclosure.
  • the terminal device 120 monitors PDCCH according to first search space sets initially.
  • the first search space sets may have a group index 0 for example and be associated with a per-slot monitoring capability in this example.
  • the terminal device 120 receives the MAC CE in the PDSCH from the network device 110.
  • the MAC CE comprises an indication indicating the terminal device 120 to monitor PDCCH according to second search space sets.
  • the second search space sets may have a group index 1 for example and be associated with the multi-slot monitoring capability, which is 4-slot monitoring capability in the example.
  • the terminal device 120 may determine a target time for a switch from the first search space sets to the second search space sets based on the transmission time of the ACK and the processing delay Q.
  • the multi-slot monitoring capability is defined over a (X, Y) span or over a sliding window. Accordingly, the terminal device 120 may determine a boundary of a slot corresponding to the per-slot monitoring capability. The boundary is spaced from the transmission time of the ACK by at least the processing delay. The boundary is determined as the target time.
  • the terminal device 120 may determine that the ACK to the MAC CE is transmitted at slot 315-4 with a slot index j (j is equal to 9 in this case) .
  • the boundary of slot 320-4 with a slot index 11 is spaced from the slot 315-4 by the processing delay Q (1 slot in this case) .
  • the terminal device 120 may determine the boundary of the slot corresponding to the per-slot monitoring capability is located at slot 320-4 with the slot index 11, and determine the boundary slot 320-4 as the target time. Accordingly, at the slot 320-4, the terminal device 120 may start monitoring PDCCH according to the second search space sets and stop monitoring PDCCH according to the first search space sets.
  • the per-slot monitoring capability is also be switched to the multi-slot monitoring capability at slot 320-4.
  • the terminal device 120 For SSSG switch from per-slot monitoring to multi-slot monitoring, the terminal device 120 adopts the SSSG switch triggered or indicated by MAC CE after the target time, e.g. slot j+Q, where j is the slot index that the ACK to MAC CE is transmitted to the network device 110 and N is the fixed processing delay.
  • the switching point may not be aligned with the boundary of the (X, Y) span or the sliding window for a switch from the per-slot monitoring capability to the multi-slot monitoring capability. In this case, even if the switching point is not aligned with the boundary, mixing of different monitoring capabilities can be avoided.
  • Fig. 3E illustrates another example of SSSG switch between per-slot monitoring and multi-slot monitoring triggered by MAC CE in accordance with some embodiments of the present disclosure.
  • the terminal device 120 monitors PDCCH according to second search space sets initially.
  • the second search space sets may have a group index 1 for example and be associated with a multi-slot monitoring capability which is 4-slot monitoring capability in this example.
  • the terminal device 120 receives the MAC CE in the PDSCH from the network device 110.
  • the MAC CE comprises an indication indicating the terminal device 120 to monitor PDCCH according to first search space sets.
  • the first search space sets may have a group index 0 for example and be associated with the per-slot monitoring capability in the example.
  • the terminal device 120 may determine a target time for a switch from the second search space sets to the first search space sets based on the transmission time of the ACK and the processing delay Q.
  • the multi-slot monitoring capability is defined over a (X, Y) span or over a sliding window. Accordingly, the terminal device 120 may determine a boundary of the (X, Y) span or the sliding window corresponding to the multi-slot monitoring capability. The boundary is spaced from the transmission time of the ACK by at least the processing delay. The boundary is determined as the target time.
  • the terminal device 120 may determine that the ACK to the MAC CE is transmitted at slot 315-5 with a slot index j (which is 9 in this case) .
  • k represents the time from the transmission time of the ACK to the nearest slot, which is the time separation of X symbols (slots) from the first symbol of the last span.
  • the nearest slot is slot 320-5 with a slot index 12. If k is not less than the processing delay Q, then slot 320-5 is determined as the target time. Accordingly, at the slot 320-5, the terminal device 120 may start monitoring PDCCH according to the first search space sets and stop monitoring PDCCH according to the second search space sets.
  • the terminal device 120 may determine the boundary slot 325-5 as the target time. Accordingly, at the slot 325-5, the terminal device 120 may start monitoring PDCCH according to the first search space sets and stop monitoring PDCCH according to the second search space sets.
  • the terminal device 120 adopts the SSSG switch triggered or indicated by MAC CE after the target time point, e.g. slot j+k, where j is the slot index that the ACK to MAC CE is transmitted to the network device 110, and k is the time from ACK of PDSCH to the nearest slot.
  • Miss detection of DCI would causes miss-match between the behavior of the network device 110 and the terminal device 120.
  • the miss-match can be prevented, especially for the SSSG switch between per-slot monitoring and multi-slot monitoring. In this way, the robustness of the SSSG switch can be improved.
  • an explicit indication of SSSG switch included in scheduling DCI may be used.
  • the terminal device 120 may be configured to support a dynamic switch between per-slot PDCCH monitoring capability and multi-slot PDCCH monitoring capability based on scheduling DCI (e.g., scheduling DCI format 1_1 or scheduling DCI format 0_1) .
  • scheduling DCI e.g., scheduling DCI format 1_1 or scheduling DCI format 0_1
  • the reference time is related to at least one data transmission scheduled by the scheduling DCI.
  • Fig. 4A illustrates an example of SSSG switch triggered by DCI scheduling downlink (DL) transmission in accordance with some embodiments of the present disclosure.
  • the terminal device 120 may determine the target time for the SSSG switch based on a reference time related to at least one DL data transmission scheduled by the DCI.
  • the reference time may be an ending time of the at least one downlink data transmission scheduled by the scheduling DCI.
  • the reference time may be a time point finishing reception of the last PDSCH scheduled by the DCI.
  • the terminal device 120 monitors PDCCH according to first search space sets initially.
  • the first search space sets may have a group index 0 for example and be associated with the multi-slot monitoring capability, which is 4-slot monitoring capability in the example.
  • the terminal device 120 receives DCI (for example, DCI format 1_1) from the network device 110.
  • the DCI schedules at least one PDSCH and comprises an indication.
  • the indication indicates the terminal device 120 to monitor PDCCH according to second search space sets.
  • the second search space sets may have a group index 1 for example and be associated with the same multi-slot monitoring capability.
  • the terminal device 120 may determine a target time for a switch from the first search space sets to the second search space sets based on the reference time.
  • the reference time is the ending time of the last PDSCH scheduled by the DCI.
  • the terminal device 120 may determine that the ending time of the last PDSCH is slot 420-1 with a slot index 8.
  • slot 420-1 is a boundary of a slot group, or a (X, Y) span or a sliding window.
  • the terminal device 120 may determine the slot 420-1 as the target time. Accordingly, at the slot 420-1, the terminal device 120 may start monitoring PDCCH according to the second search space sets and stop monitoring PDCCH according to the first search space sets.
  • the terminal device 120 may determine a first slot of the next slot group or next span as the target time.
  • the terminal device 120 if the terminal device 120 receives an indication of SSSG switch included in DCI scheduling DL transmission, the terminal device 120 starts monitoring PDCCH according to the first search space sets with the group index 0, and stops monitoring PDCCH according to the second search space sets with the group index 1, for the serving cell at a slot after finishing the reception of the last PDSCH scheduled by the DCI and aligned with the slot group boundary, or the (X, Y) span boundary or the sliding window boundary.
  • the terminal device 120 adopts the SSSG switch at a time point after finishing the reception of the last PDSCH scheduled by the DCI and aligned with the boundary. In this way, unnecessary retransmission of the multiple PDSCH can be avoided. It is to be understood that, the above described SSSG switch process may also be applied to the switch from the second search space sets to the first search space sets.
  • Fig. 4B illustrates another example of SSSG switch triggered by DCI scheduling DL transmission in accordance with some embodiments of the present disclosure.
  • the terminal device 120 may determine the target time for the SSSG switch based on a reference time related to at least one DL data transmission scheduled by the DCI.
  • the reference time may be a transmission time of ACK to the at least one downlink data transmission scheduled by the scheduling DCI.
  • the reference time may be a transmission time of ACK to the PDSCH scheduled by the DCI.
  • the terminal device 120 monitors PDCCH according to first search space sets initially.
  • the first search space sets may have a group index 0 for example and be associated with the multi-slot monitoring capability, which is 4-slot monitoring capability in the example.
  • the terminal device 120 receives DCI (for example, DCI format 1_1) from the network device 110.
  • the DCI schedules at least one PDSCH and comprises an indication.
  • the indication indicates the terminal device 120 to monitor PDCCH according to second search space sets.
  • the second search space sets may have a group index 1 for example and be associated with the same multi-slot monitoring capability.
  • the terminal device 120 may determine a target time for a switch from the first search space sets to the second search space sets based on the reference time.
  • the reference time is a transmission time of an ACK to the at least one downlink data transmission scheduled by the DCI.
  • the terminal device 120 may determine that the transmission time of ACK to the PDSCH scheduled by the DCI is slot 415-2 with a slot index 13. Then, the terminal device 120 may determine a boundary of a slot group corresponding to the multi-slot monitoring capability after the slot 415-2. The boundary of the slot group is determined as the target time. As in the example of Fig. 4B, the terminal device 120 may determine the slot 420-2 with a slot index 16 as the target time. Accordingly, at the slot 420-2, the terminal device 120 may start monitoring PDCCH according to the second search space sets and stop monitoring PDCCH according to the first search space sets.
  • NACK ACK/negative acknowledgement
  • R hybrid automatic repeat request
  • the target time for the SSSG switch (or in other words, switching point) need to be aligned with the slot group boundary, the (X, Y) span boundary or the sliding window boundary. It is to be understood that, the above described SSSG switch process may also be applied to the switch from the second search space sets to the first search space sets.
  • the terminal device 120 might miss-detect the DCI, which would lead to the miss match of the behavior between the network device 110 and the terminal device 120.
  • the terminal device 120 can notice the network device 110 the reception of the DCI. In this way, the miss match of the behavior between the network device 110 and the terminal device 120 can be avoided, which can potentially improve the performance of the terminal device 120.
  • Fig. 4C illustrates an example of SSSG switch triggered by DCI scheduling uplink transmission in accordance with some embodiments of the present disclosure.
  • the terminal device 120 may determine the target time for the SSSG switch based on a reference time related to the at least one uplink data transmission scheduled by the DCI such as DCI format 0_1.
  • the reference time may be an ending time of at least one uplink data transmission scheduled by the scheduling DCI.
  • the reference time may be a transmission time of the last physical uplink shared channel (PUSCH) scheduled by the DCI.
  • PUSCH physical uplink shared channel
  • the terminal device 120 monitors PDCCH according to first search space sets initially.
  • the first search space sets may have a group index 0 for example and be associated with the multi-slot monitoring capability, which is 4-slot monitoring capability in the example.
  • the terminal device 120 receives DCI (for example, DCI format 0_1) from the network device 110.
  • the DCI schedules at least one PUSCH and comprises an indication.
  • the indication indicates the terminal device 120 to monitor PDCCH according to second search space sets.
  • the second search space sets may have a group index 1 for example and be associated with the same multi-slot monitoring capability.
  • the terminal device 120 may determine a target time for a switch from the first search space sets to the second search space sets based on the reference time.
  • the reference time is the ending time of the last PUSCH scheduled by the DCI.
  • the terminal device 120 may determine that the ending time of the last PUSCH is slot 420-3 with a slot index 8.
  • the slot 420-3 is a boundary of a slot group, or a (X, Y) span or a sliding window.
  • the terminal device 120 may determine the slot 420-3 as the target time. Accordingly, at the slot 420-3, the terminal device 120 may start monitoring PDCCH according to the second search space sets and stop monitoring PDCCH according to the first search space sets.
  • the terminal device 120 may determine a first slot of the next slot group or next span as the target time.
  • the terminal device 120 if the terminal device 120 receives an indication of SSSG switch included in DCI scheduling uplink transmission, the terminal device 120 starts monitoring PDCCH according to the first search space sets with group index 0, and stops monitoring PDCCH according to the second search space sets with group index 1, for the serving cell at a slot after finishing the transmission of the last PUSCH scheduled by the DCI and aligned with the slot group boundary, or the (X, Y) span boundary or the sliding window boundary.
  • the above described SSSG switch process may also be applied to the switch from the second search space sets to the first search space sets.
  • both the first and second search space sets are associated with the multi-slot monitoring capability.
  • the scheduling DCI can be applied to SSSG switch between per-slot monitoring and multi-slot monitoring. If the SSSG switch is from per-slot monitoring to multi-slot monitoring, one PDSCH or PUSCH may be scheduled by the DCI.
  • indicating the SSSG switch by a scheduling DCI can be implemented in various manners other than the embodiments above. By this way, it can avoid unnecessary retransmission and thus further improve the performance of the terminal device 120.
  • the switch delay for example, P switch symbols
  • the switch delay used by the terminal device 120 to determine the target time may be predefined or predetermined for different monitoring capabilities.
  • two or more separate SSSG switch delay tables (for example, the above Table 1 and the below Table 2) may be used for per-slot monitoring capability and multi-slot monitoring capability, respectively.
  • Table 2 below may be a reference for SSSG switch from a multi-slot PDCCH monitoring capability to per slot PDCCH monitoring capability or to another multi-slot PDCCH monitoring capability with a different periodicity.
  • RRC may configure two different searchSpaceSwitchDelay parameters for per-slot PDCCH monitoring capability and multi-slot PDCCH monitoring capability.
  • the table (e.g., Table 1) may be taken as a reference for RRC configuration when switch from multi-slot PDCCH monitoring capability to per slot PDCCH monitoring capability.
  • the switch delay may be determined by using the RRC configured searchSpaceSwitchDelay directly. That is, the switch delay is the same for differnent monitoring capabilities.
  • the switch delay may be determined by minus an additional processing time T delta_delay based on the RRC configured searchSpaceSwitchDelay. That is, the switch delay is different for different capabilities.
  • there is only one SSSG switch delay table with ⁇ 5 and 6, and the switch delay in this table is based on per slot PDCCH monitoring capability.
  • This table may be taken as a reference for RRC configuration when switch from per-slot PDCCH monitoring capability to multi-slot PDCCH monitoring capability.
  • the switch delay may be determined by using the RRC configured searchSpaceSwitchDelay directly. That is, the switch delay is the same for different monitoring capabilities.
  • the switch delay may be determined by adding an additional processing time T delta_delay based on the RRC configured searchSpaceSwitchDelay. That is, the switch delay is different for different capabilities.
  • Fig. 5 illustrates a flowchart of an example method 500 in accordance with some embodiments of the present disclosure.
  • the method 500 can be implemented at a terminal device 120 as shown in Fig. 1. It is to be understood that the method 500 may include additional blocks not shown and/or may omit some blocks as shown, and the scope of the present disclosure is not limited in this regard. For the purpose of discussion, the method 500 will be described from the perspective of the terminal device 120 with reference to Fig. 1.
  • the terminal device 120 determines a target time for a switch from a first group of search space sets to a second group of search space sets based on a reference time associated with an indication indicating the switch. At least one of the first and second groups corresponding to a monitoring capability defined over a plurality of slots.
  • the terminal device 120 starts, at the target time, monitoring a control channel from a network device 110 to the terminal device 120 according to the second group of search space sets. At the same time, monitoring of the control channel according to the first group of search space sets is stopped.
  • the reference time comprises one of: a reception time of control information comprising the indication, an expiration time of a timer indicating the switch, or an expiration time of a channel occupancy time.
  • one of the first and second groups corresponds to a first monitoring capability defined over a first number of slots and the other one of the first and second groups corresponds to a second monitoring capability defined over a second number of slots, and the first number is larger than or equal to the second number
  • determining the target time comprises: determining a boundary of a time period corresponding to the first monitoring capability, the boundary spaced from the reference time by at least a switch delay; and determining the boundary of the time period as the target time.
  • the second group corresponds to a first monitoring capability defined over one of: a span with a first number of consecutive symbols or slots, an interval between two consecutive spans comprising a second number of consecutive symbols or slots, or a sliding window with a predetermined number of slots
  • the first group corresponds to a second monitoring capability defined over at least one slot
  • determining the target time comprises: determining a boundary of a time period corresponding to the second monitoring capability, the boundary spaced from the reference time by at least a switch delay; and determining the boundary of the time period as the target time.
  • determining the target time comprises: determining a target slot spaced from the reference time by at least a switch delay, the switch delay predefined such that the target slot is aligned with a boundary of a time period for defining the monitoring capability; and determining the target slot as the target time.
  • determining the target time comprises: receiving, from the network device, a MAC CE, comprising the indication; determining a transmission time of an acknowledge to the MAC CE as the reference time; and determining the target time based on the transmission time and a predetermined processing delay.
  • one of the first and second groups corresponds to a first monitoring capability defined over a first number of slots and the other one of the first and second groups corresponds to a second monitoring capability defined over a second number of slots, and the first number is larger than or equal to the second number
  • determining the target time based on the transmission time and the predetermined processing delay comprises: determining a boundary of a time period corresponding to the first monitoring capability, the boundary spaced from the transmission time by at least the predetermined processing delay; and determining the boundary of the time period as the target time.
  • the second group corresponds to a first monitoring capability defined over one of: a span with a first number of consecutive symbols or slots, an interval between two consecutive spans comprising a second number of consecutive symbols or slots, or a sliding window with a predetermined number of slots
  • the first group corresponds to a second monitoring capability defined over at least one slot
  • determining the target time based on the transmission time and the predetermined processing delay comprises: determining a boundary of a time period corresponding to the second monitoring capability, the boundary spaced from the transmission time by at least the predetermined processing delay; and determining the boundary of the time period as the target time.
  • determining the target time comprises: receiving, from the network device, downlink control information comprising the indication; determining a time related to at least one data transmission scheduled by the control information as the reference time; and determining the target time based on the time related to the at least one data transmission.
  • the time related to the at least one data transmission comprises: an ending time of at least one downlink data transmission scheduled by the control information, a transmission time of an acknowledge to at least one downlink data transmission scheduled by the control information, or an ending time of at least one uplink data transmission scheduled by the control information.
  • one of the first and second groups corresponds to a first monitoring capability defined over a first number of slots and the other one of the first and second groups corresponds to a second monitoring capability defined over a second number of slots, and the first number is larger than or equal to the second number
  • determining the target time based on the time related to the at least one data transmission comprises: determining a boundary of a time period corresponding to the first monitoring capability, the boundary subsequent to the time related to the at least one data transmission; and determining the boundary of the time period as the target time.
  • the time period comprises one of: a slot group with a fixed pattern of slots, a span with a first number of consecutive symbols or slots, an interval between two consecutive spans comprising a second number of consecutive symbols or slots, or a sliding window with a predetermined number of slots.
  • the second group corresponds to a first monitoring capability defined over one of: a span with a first number of consecutive symbols or slots, an interval between two consecutive spans comprising a second number of consecutive symbols or slots, or a sliding window with a predetermined number of slots
  • the first group corresponds to a second monitoring capability defined over at least one slot
  • determining the target time based on the time related to the at least one data transmission comprises: determining a boundary of a time period corresponding to the second monitoring capability, the boundary subsequent to the time related to the at least one data transmission; and determining the boundary of the time period as the target time.
  • a switch delay used by the terminal device to determine the target time is predefined for different monitoring capabilities.
  • a switch delay used by the terminal device to determine the target time is the same for different monitoring capabilities.
  • a switch delay for a first monitoring capability is determined based on a switch delay predefined for a second monitoring capability different from the first monitoring capability.
  • Fig. 6 illustrates a flowchart of an example method 600 in accordance with some embodiments of the present disclosure.
  • the method 600 can be implemented at the network device 110 as shown in Fig. 1. It is to be understood that the method 600 may include additional blocks not shown and/or may omit some blocks as shown, and the scope of the present disclosure is not limited in this regard. For the purpose of discussion, the method 600 will be described from the perspective of the network device 110 with reference to Fig. 1.
  • the network device 110 generates an indication indicating a switch from a first group of search space sets to a second group of search space sets. At least one of the first and second groups corresponding to a monitoring capability defined over a plurality of slots.
  • the network device 110 transmits, to the terminal device 120, a MAC CE comprising the indication.
  • Fig. 7 illustrates a flowchart of an example method 700 in accordance with some embodiments of the present disclosure.
  • the method 700 can be implemented at the network device 110 as shown in Fig. 1. It is to be understood that the method 700 may include additional blocks not shown and/or may omit some blocks as shown, and the scope of the present disclosure is not limited in this regard. For the purpose of discussion, the method 700 will be described from the perspective of the network device 110 with reference to Fig. 1.
  • the network device 110 generates an indication indicating a switch from a first group of search space sets to a second group of search space sets. At least one of the first and second groups corresponding to a monitoring capability defined over a plurality of slots.
  • the network device 110 transmits, to the terminal device 120, downlink control information comprising the indication. The downlink control information schedules at least one data transmission.
  • a terminal device for example, the terminal device 120 comprising circuitry configured to: determine a target time for a switch from a first group of search space sets to a second group of search space sets based on a reference time associated with an indication indicating the switch, at least one of the first and second groups corresponding to a monitoring capability defined over a plurality of slots; and start, at the target time, monitoring a control channel from a network device to the terminal device according to the second group of search space sets, monitoring of the control channel according to the first group of search space sets is stopped.
  • the reference time comprises one of: a reception time of control information comprising the indication, an expiration time of a timer indicating the switch, or an expiration time of a channel occupancy time.
  • one of the first and second groups corresponds to a first monitoring capability defined over a first number of slots and the other one of the first and second groups corresponds to a second monitoring capability defined over a second number of slots, and the first number is larger than or equal to the second number, and in determining the target time, the circuitry is further configured to: determine a boundary of a time period corresponding to the first monitoring capability, the boundary spaced from the reference time by at least a switch delay; and determine the boundary of the time period as the target time.
  • the second group corresponds to a first monitoring capability defined over one of: a span with a first number of consecutive symbols or slots, an interval between two consecutive spans comprising a second number of consecutive symbols or slots, or a sliding window with a predetermined number of slots
  • the first group corresponds to a second monitoring capability defined over at least one slot
  • the circuitry in determining the target time, is further configured to: determine a boundary of a time period corresponding to the second monitoring capability, the boundary spaced from the reference time by at least a switch delay; and determine the boundary of the time period as the target time.
  • the circuitry in determining the target time, is further configured to: determine a target slot spaced from the reference time by at least a switch delay, the switch delay predefined such that the target slot is aligned with a boundary of a time period for defining the monitoring capability; and determine the target slot as the target time.
  • the circuitry in determining the target time, is further configured to: receive, from the network device, a MAC CE, comprising the indication; determine a transmission time of an acknowledge to the MAC CE as the reference time; and determine the target time based on the transmission time and a predetermined processing delay.
  • one of the first and second groups corresponds to a first monitoring capability defined over a first number of slots and the other one of the first and second groups corresponds to a second monitoring capability defined over a second number of slots, and the first number is larger than or equal to the second number, and in determining the target time based on the transmission time and the predetermined processing delay, the circuitry is further configured to: determine a boundary of a time period corresponding to the first monitoring capability, the boundary spaced from the transmission time by at least the predetermined processing delay; and determine the boundary of the time period as the target time.
  • the second group corresponds to a first monitoring capability defined over one of: a span with a first number of consecutive symbols or slots, an interval between two consecutive spans comprising a second number of consecutive symbols or slots, or a sliding window with a predetermined number of slots
  • the first group corresponds to a second monitoring capability defined over at least one slot
  • the circuitry in determining the target time based on the transmission time and the predetermined processing delay, is further configured to: determine a boundary of a time period corresponding to the second monitoring capability, the boundary spaced from the transmission time by at least the predetermined processing delay; and determine the boundary of the time period as the target time.
  • the circuitry in determining the target time, is further configured to: receive, from the network device, downlink control information comprising the indication; determine a time related to at least one data transmission scheduled by the control information as the reference time; and determine the target time based on the time related to the at least one data transmission.
  • the time related to the at least one data transmission comprises: an ending time of at least one downlink data transmission scheduled by the control information, a transmission time of an acknowledge to at least one downlink data transmission scheduled by the control information, or an ending time of at least one uplink data transmission scheduled by the control information.
  • one of the first and second groups corresponds to a first monitoring capability defined over a first number of slots and the other one of the first and second groups corresponds to a second monitoring capability defined over a second number of slots, and the first number is larger than or equal to the second number, and in determining the target time based on the time related to the at least one data transmission, the circuitry is further configured to: determine a boundary of a time period corresponding to the first monitoring capability, the boundary subsequent to the time related to the at least one data transmission; and determine the boundary of the time period as the target time.
  • the time period comprises one of: a slot group with a fixed pattern of slots, a span with a first number of consecutive symbols or slots, an interval between two consecutive spans comprising a second number of consecutive symbols or slots, or a sliding window with a predetermined number of slots.
  • the second group corresponds to a first monitoring capability defined over one of: a span with a first number of consecutive symbols or slots, an interval between two consecutive spans comprising a second number of consecutive symbols or slots, or a sliding window with a predetermined number of slots
  • the first group corresponds to a second monitoring capability defined over at least one slot
  • the circuitry in determining the target time based on the time related to the at least one data transmission, is further configured to: determine a boundary of a time period corresponding to the second monitoring capability, the boundary subsequent to the time related to the at least one data transmission; and determine the boundary of the time period as the target time.
  • a switch delay used by the terminal device to determine the target time is predefined for different monitoring capabilities.
  • a switch delay used by the terminal device to determine the target time is the same for different monitoring capabilities.
  • a switch delay for a first monitoring capability is determined based on a switch delay predefined for a second monitoring capability different from the first monitoring capability.
  • a network device for example, the network device 110 comprising circuitry configured to: generate an indication indicating a switch from a first group of search space sets to a second group of search space sets, at least one of the first and second groups corresponding to a monitoring capability defined over a plurality of slots; and transmit, to a terminal device, a MAC CE comprising the indication.
  • a network device for example, the network device 110 comprising circuitry configured to: generate an indication indicating a switch from a first group of search space sets to a second group of search space sets, at least one of the first and second groups corresponding to a monitoring capability defined over a plurality of slots; and transmit, to a terminal device, downlink control information comprising the indication, the downlink control information scheduling at least one data transmission.
  • Fig. 8 is a simplified block diagram of a device 800 that is suitable for implementing embodiments of the present disclosure.
  • the device 800 can be considered as a further example implementation of the network device 110 or the terminal device 120 as shown in Fig. 1. Accordingly, the device 800 can be implemented at or as at least a part of the network device 110 or the terminal device 120.
  • the device 800 includes a processor 810, a memory 820 coupled to the processor 810, a suitable transmitter (TX) and receiver (RX) 1140 coupled to the processor 810, and a communication interface coupled to the TX/RX 840.
  • the memory 810 stores at least a part of a program 830.
  • the TX/RX 840 is for bidirectional communications.
  • the TX/RX 840 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 830 is assumed to include program instructions that, when executed by the associated processor 810, enable the device 800 to operate in accordance with the embodiments of the present disclosure, as discussed herein with reference to Figs. 1 to 7.
  • the embodiments herein may be implemented by computer software executable by the processor 810 of the device 800, or by hardware, or by a combination of software and hardware.
  • the processor 810 may be configured to implement various embodiments of the present disclosure.
  • a combination of the processor 810 and memory 820 may form processing means 850 adapted to implement various embodiments of the present disclosure.
  • the memory 820 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 820 is shown in the device 1100, there may be several physically distinct memory modules in the device 800.
  • the processor 810 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 800 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.
  • 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 Fig. 5, Fig. 6 and/or Fig. 7.
  • 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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Abstract

Les modes de réalisation de la présente divulgation concernent des procédés, des dispositifs et des supports de stockage informatiques permettant une communication. Un dispositif terminal détermine un temps cible pour une commutation d'un premier groupe d'ensembles d'espaces de recherche à un second groupe d'ensembles d'espaces de recherche sur la base d'un temps de référence associé à une indication indiquant la commutation, au moins un des premier et second groupes correspondant à une capacité de surveillance définie sur une pluralité d'intervalles. Puis, au temps cible, le dispositif terminal commence à surveiller un canal de commande d'un dispositif de réseau au dispositif terminal en fonction du second groupe d'ensembles d'espaces de recherche, la surveillance du canal de commande en fonction du premier groupe d'ensembles d'espaces de recherche étant arrêtée.
PCT/CN2021/085405 2021-04-02 2021-04-02 Procédés, dispositifs et supports de stockage informatiques permettant une communication WO2022205457A1 (fr)

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HUAWEI, HISILICON: "Maintenance on DL signals and channels", 3GPP DRAFT; R1-2001532, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Online Meeting ;20200420 - 20200430, 11 April 2020 (2020-04-11), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051875123 *
MEDIATEK INC.: "Remaining issues DL signals and channels for NR-U", 3GPP DRAFT; R1-2001902, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20200420 - 20200430, 11 April 2020 (2020-04-11), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051875335 *

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