WO2020029172A1 - Procédé et appareil de sélection de ressource - Google Patents

Procédé et appareil de sélection de ressource Download PDF

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Publication number
WO2020029172A1
WO2020029172A1 PCT/CN2018/099607 CN2018099607W WO2020029172A1 WO 2020029172 A1 WO2020029172 A1 WO 2020029172A1 CN 2018099607 W CN2018099607 W CN 2018099607W WO 2020029172 A1 WO2020029172 A1 WO 2020029172A1
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WIPO (PCT)
Prior art keywords
resources
group
pdcch
pdcch candidates
selecting
Prior art date
Application number
PCT/CN2018/099607
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English (en)
Inventor
Haigang HE
Peng Hao
Chenchen Zhang
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Zte Corporation
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Priority to PCT/CN2018/099607 priority Critical patent/WO2020029172A1/fr
Priority to CN201880096661.5A priority patent/CN113016220B/zh
Publication of WO2020029172A1 publication Critical patent/WO2020029172A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H04W52/0229—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a wanted signal
    • 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
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
    • H04W52/0216—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave using a pre-established activity schedule, e.g. traffic indication frame
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0261—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level
    • H04W52/0274—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level by switching on or off the equipment or parts thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • This patent document is directed generally to digital wireless communications.
  • This document relates to methods, systems, and devices related to digital wireless communication, and more specifically, for selecting resources associated with control channel candidates, such as Physical Downlink Control Channel (PDCCH) candidates.
  • PDCCH Physical Downlink Control Channel
  • a method of wireless communication includes selecting a second group of resources from a first group of resources, based on at least one of symbol direction, division of a slot, resource usage, or signaling.
  • the method also includes performing physical channel based wireless communication using at least one or more resources of the second group of resources.
  • the first group of resources includes a plurality of Physical Downlink Control Channel (PDCCH) candidates corresponding to one or more search space sets.
  • the second group of resources includes a subset of the plurality of PDCCH candidates.
  • performing the wireless communication includes selecting, from the second group of resources, one or more PDCCH candidates, and transmitting one or more Downlink Control Information (DCI) using the selected one or more PDCCH candidates.
  • DCI Downlink Control Information
  • selecting the second group of resources is based, at least in part, on at least one of a total number of blind detections corresponding to PDCCH candidates of the second group of resources or a total number of Control Channel Elements (CCEs) associated with the PDCCH candidates of the second group of resources.
  • CCEs Control Channel Elements
  • one or more target PDCCH candidates included in the second group of resources are excluded from the PDCCH candidates for purposes of determining at least one of the total number of blind detections or the total number of CCEs, wherein the one or more target PDCCH candidates relate to notification of at least one of (a) terminal wake-up information or (b) downlink control information associated with terminal wake-up.
  • a slot where at least one PDCCH candidate relating to terminal wake-up is located includes a plurality of divisions.
  • selecting the second group of resources includes, during a first division of the slot, selecting one or more PDCCH candidates based, at least in part, on a first rule.
  • the first rule includes at least one of: only selecting one or more Wake-Up PDCCH (WUP) PDCCH candidates to add into the second group of resources, or only selecting (a) one or more WUP PDCCH candidates and (b) one or more PDCCH candidates used to notify slot format, to add into the second group of resources.
  • WUP Wake-Up PDCCH
  • selecting the second group of resources includes, during a second division of the slot, selecting one or more PDCCH candidates based, at least in part, on a second rule.
  • the second rule includes selecting one or more PDCCH candidates to add into the second group in accordance with an order of at least one of search space set type or search space set index.
  • selecting the second group of resources based on symbol direction comprises excluding one or more PDCCH candidates that overlap with one or more symbols indicated to uplink symbol from the second group of resources.
  • selecting the second group of resources based on symbol direction comprises excluding one or more PDCCH candidates that overlap with one or more symbols indicated to flexible symbol from the second group of resources.
  • selecting the second group of resources based on symbol direction comprises excluding all PDCCH candidates in a search space set from the second group of resources, if the search space set includes at least one PDCCH candidate overlapping with one or more symbols indicated to uplink symbol.
  • selecting the second group of resources based on symbol direction comprises excluding all PDCCH candidates in a search space set from the second group of resources, if the search space set includes at least one PDCCH candidate overlapping with one or more symbols indicated to flexible symbol.
  • selecting the second group of resources comprises selecting one or more PDCCH candidates from a plurality of User-Specific Search Space (USS) sets based on at least one of: preferentially selecting one or more PDCCH candidates from a first subset of the plurality of USS sets each including at least one WUP PDCCH candidate; or selecting one or more PDCCH candidates from a second subset of the plurality of USS sets in accordance with search space set ID, wherein the second subset of USS sets excludes any USS set of the first subset.
  • USS User-Specific Search Space
  • selecting the second group of resources comprises preferentially selecting at least one WUP PDCCH candidate within a USS set if it includes one or more WUP PDCCH candidates.
  • selecting the second group of resources comprises, in a slot including at least one WUP PDCCH candidate, performing at least one of: only selecting one or more WUP PDCCH candidates; only selecting (a) one or more WUP PDCCH candidates and (b) one or more PDCCHs included in one or more Common Search Space (CSS) sets; only selecting (a) one or more PDCCHs from one or more search space sets each including at least one WUP PDCCH candidate and (b) one or more PDCCHs included in one or more CSS sets; or only selecting (a) one or more WUP PDCCH candidates and (b) one or more PDCCHs that notify Slot Format Indication (SFI) .
  • SFI Slot Format Indication
  • the first group of resources are divided into a plurality of resources in accordance with one or more predetermined rules and a base station indicates one or more resource indexes via signaling to form the second group of resources.
  • a base station indicates, via signaling, the second group of resources based, at least in part, on the first group of resources, wherein the signaling includes at least one of high-level signaling, MAC CE, physical downlink control signaling, or at least one sequence.
  • the second group of resources is indicated, at least in part, by at least one of an index of a sequence, a circular shift of a sequence. or a time-frequency resource location occupied by a sequence.
  • performing the wireless communication includes monitoring one or more PDCCHs based, at least in part, on a subset of the second group of resources. In some embodiments, monitoring the one or more PDCCHs comprises at least one of blind detection or CCE estimation.
  • an apparatus for wireless communication that is configured or operable to perform the above-described methods is disclosed.
  • the above-described methods are embodied in the form of processor-executable code and stored in a computer-readable program medium.
  • FIG. 1 is a flow chart illustrating an exemplary base station side process for communication based on selected resources, in accordance with some embodiments of the presently disclosed technology.
  • FIG. 2 is a flow chart illustrating an exemplary terminal side process for communication based on selected resources, in accordance with some embodiments of the presently disclosed technology.
  • FIGS. 3-11 illustrate examples of search space configurations, in accordance with various embodiments of the presently disclosed technology.
  • FIG. 12 shows an example of a wireless communication system where techniques in accordance with one or more embodiments of the present technology can be applied.
  • FIG. 13 is a block diagram representation of a portion of a radio station.
  • downlink control information is carried by a Physical Downlink Control Channel (PDCCH) .
  • a base station selects one PDCCH candidate among the multiple PDCCH candidates as the final PDCCH channel.
  • An associated terminal e.g., user equipment or UE
  • the terminal needs to perform PDCCH demodulation and decoding of individual PDCCH candidates until the final PDCCH channel is successfully found.
  • Each aggregation level usually includes multiple PDCCH candidates.
  • An aggregation level generally refers to the number of Control Channel Elements (CCEs) included in a PDCCH candidate. For example, if the aggregation level is 4, then each PDCCH candidate with the aggregation level includes 4 CCEs.
  • CCEs Control Channel Elements
  • a CCE includes 6 Resource Element Groups (REGs)
  • REGs Resource Elements
  • a larger number of PDCCH candidates can lead to a larger number of blind detection of PDCCH candidates by a terminal, and consequently more channel estimation of CCEs.
  • Control Resource Set is mainly used to determine the frequency domain range in which the base station transmits the PDCCH and the terminal detects the PDCCH, and to determine the number of symbols occupied by the PDCCH channel.
  • Search space set is mainly used to determine which aggregation levels PDCCH (s) can use, the number of PDCCH candidates at a specific aggregation level, and information such as the period and time domain position of PDCCH (s) .
  • the periods of different search space sets may be different.
  • the total number of PDCCH candidates on the slot will increase significantly, so the number of blind detections of PDCCH by a terminal as well as the number of CCEs that need to be channel estimated, will also increase significantly.
  • at least one of the total number of PDCCH candidates on all search space sets or the total number of CCEs that need channel estimation may exceed the capabilities supported by a User Equipment (UE) terminal.
  • UE User Equipment
  • the number of PDCCH candidates included in one search space set is relatively small, a PDCCH candidate allocated to a terminal in the search space set can have a resource conflict with a PDCCH candidate of another terminal. In this case, the PDCCH candidate for one terminal in the search space set is likely to be occupied by other terminal (s) , leaving no available PDCCH candidate resources in the search space set for the terminal to use.
  • base station and terminal (s) can discard some PDCCH candidates according to the same rule (s) , so that the number of preserved (i.e., not discarded) PDCCH candidates does not exceed terminal capability.
  • the rules for the base station and the terminal (s) to select PDCCH candidate (s) can be:
  • the base station selects one or more PDCCH candidates from the preserved PDCCH candidates, and uses the selected PDCCH (s) to send downlink control information to the terminal (s) .
  • base station can indicate the location of PDCCH candidate (s) in the search space set by signaling.
  • location of PDCCH candidate (s) in the search space set can be determined by two rules (e.g., two Hashing functions) . In this way and with proper design of the resource location of the PDCCH candidates in the search space set, the probability of resource conflicts can be reduced.
  • FIG. 1 is a flow chart illustrating an exemplary base station side process for communication based on selected resources, in accordance with some embodiments of the presently disclosed technology.
  • a base station determines a first group of resources.
  • the first group of resources can be (a) multiple PDCCH candidates that correspond to slot n and are configured by the base station for a terminal, or (b) time-frequency resource (s) corresponding to a CORESET in a slot.
  • the base station selects a second group of resources from the first group of resources.
  • the base station selects PDCCH candidate (s) from the PDCCH candidate set of slot n according to certain rule (s) , to preserve the selected PDCCH candidate (s) as the second group of resources.
  • the base station instructs or calculates (according to certain rule (s) ) to select one or more resources within the time-frequency resource range corresponding to the CORESET in the slot, as preserved PDCCH candidate resources (i.e., the second group of resources) .
  • the base station selects, from the second group of resources, one or more resources for PDCCH purposes.
  • the base station transmits, via selected one or more PDCCHs, downlink control information (DCI) to at least one terminal.
  • DCI downlink control information
  • FIG. 2 is a flow chart illustrating an exemplary terminal side process for communication based on selected resources, in accordance with some embodiments of the presently disclosed technology.
  • a terminal determines a first group of resources.
  • the first group of resources can be (a) multiple PDCCH candidates that correspond to slot n and are configured by a base station, or (b) time-frequency resource (s) corresponding to a CORESET in a slot.
  • the terminal selects a second group of resources from the first group of resources.
  • the terminal selects PDCCH candidate (s) from the PDCCH candidate set of slot n according to certain rule (s) (e.g., the same rule (s) as used by a base station associated with the terminal) , to preserve the selected PDCCH candidate (s) as the second group of resources.
  • certain rule e.g., the same rule (s) as used by a base station associated with the terminal
  • the terminal selects one or more PDCCH candidate resources from the first group of resources as preserved PDCCH candidate resources (i.e., the second group of resources) as instructed by the base station or based on calculations according to certain rule (s) .
  • the terminal monitors PDCCH (s) based on the second group of resources (i.e., the PDCCH candidates selected for preservation) .
  • the preserved PDCCH candidate (s) are selected based on symbol direction.
  • PDCCH candidate (s) that overlap with one or more uplink symbols are not selected as the preserved PDCCH candidate (s) .
  • PDCCH candidate (s) that overlap with one or more flexible symbols are not selected as the preserved PDCCH candidate (s) .
  • the base station configures search space set (s) for a terminal.
  • the configured search space set (s) can include common search space (CSS) set (s) and UE-specific search space (USS) set (s) .
  • a base station configures one CSS set and two USS sets for a terminal, in accordance with some embodiments.
  • the aggregation level and the number of PDCCH candidates included in the CSS set are illustrated in FIG. 3, and the PDCCH candidates’corresponding locations in slot n are shown in FIG. 4.
  • ′D′ denotes a fixed downlink symbol
  • ′X′ denotes a flexible symbol
  • ′U′ denotes a fixed uplink symbol.
  • a flexible symbol may be used for downlink transmission or uplink transmission.
  • the CSS set is configured as follows:
  • each PDCCH candidate time domain occupies 2 symbols;
  • ′D′ denotes a fixed downlink symbol
  • ′X′ denotes a flexible symbol
  • ′U′ denotes a fixed uplink symbol.
  • a flexible symbol may be used for downlink transmission or uplink transmission.
  • the USS set 1 is configured as follows:
  • each PDCCH candidate time domain occupies 2 symbols;
  • ′D′ denotes a fixed downlink symbol
  • ′X′ denotes a flexible symbol
  • ′U′ denotes a fixed uplink symbol.
  • a flexible symbol may be used for downlink transmission or uplink transmission.
  • the USS set 2 is configured as follows:
  • each PDCCH monitoring occasion in a PDCCH monitoring slot there is one PDCCH monitoring occasion in a PDCCH monitoring slot, the starting symbol index of the monitoring occasion in the monitoring slot is symbol 0, respectively, and each PDCCH candidate time domain occupies 2 symbols;
  • the base station selects, first from the CSS set and then from the USS sets, PDCCH candidates for preservation, until at least one of the number of PDCCH blind detections corresponding to the selected PDCCH candidate (s) or the number of CCEs corresponding to the selected PDCCH candidate (s) meets or exceeds a threshold. All of PDCCH candidates included in one search space set that have only downlink symbol (s) are either selected as preserved PDCCH candidates or discarded, as a whole.
  • the base station selects PDCCH candidate (s) based on symbol direction, where the symbol direction includes downlink symbol, uplink symbol, and flexible symbol.
  • Downlink symbol can mean that the transmission direction of the symbol is fixed to downlink.
  • Uplink symbol can mean that the transmission direction of the symbol is fixed to uplink.
  • Flexible symbol can mean that the transmission direction of the symbol can be either uplink or downlink.
  • Symbol direction can be determined based on indication signaling (s) . For example, symbol direction can be indicated by higher layer signaling or physical layer signaling.
  • PDCCH candidate (s) overlapping with at least one of uplink symbol (s) or flexible symbol (s) is not selected as a preserved PDCCH candidate.
  • the base station selects PDCCH candidates in a specific order, the PDCCH candidates overlapping with at least one of uplink symbol (s) or flexible symbol (s) can be skipped.
  • the base station first selects 2 PDCCH candidates with aggregation level 4 in the CSS set.
  • the 2 selected PDCCH candidates do not include uplink symbol (s) or flexible symbol (s) , so these 2 PDCCH candidates are selected as preserved PDCCH candidates.
  • the base station After selecting the PDCCH candidates from the CSS set, the base station selects PDCCH candidate (s) from the USS sets.
  • the base station selects PDCCH candidate (s) in ascending order of USS set ID. Therefore, the base station first selects PDCCH candidate (s) from USS set 1.
  • the 3 PDCCH candidates on the occasion 1 include the uplink symbol, so the base station skips or discards them.
  • the base station only selects from the 3 PDCCH candidates on occasion 0 to add to the preserved PDCCH candidates.
  • the base station can select the 3 PDCCH candidates on occasion 0 in the USS set 1 as additional preserved PDCCH candidates.
  • the base station After the base station selects the 3 PDCCH candidates on occasion 0 in the USS set 1 as some of the preserved PDCCH candidates, the base station continues to select PDCCH candidates from the USS set 2. As shown in FIG. 6, because none of the PDCCH candidates in the USS set 2 overlaps with the uplink symbol or flexible symbol, when neither the number of PDCCH blind detections corresponding to the selected PDCCH candidate (s) nor the number of CCEs corresponding to the selected PDCCH candidate (s) exceeds the threshold respectively, all PDCCH candidates in the USS set 2 are also selected as preserved PDCCH candidates.
  • the base station selects, among the preserved PDCCH candidates, one or more PDCCH candidates as the PDCCH (s) which the base station uses to send downlink control information (DCI) to at least one terminal.
  • DCI downlink control information
  • the at least one terminal can select PDCCH candidate (s) for preservation according to the same rule (s) as used by the base station, and monitor PDCCH (s) based the preserved PDCCH candidate (s) (e.g., the second group of resources) for communicating with the base station.
  • the preserved PDCCH candidate (s) are selected based on symbol direction.
  • a search space set includes at least one PDCCH candidate that overlaps with one or more uplink symbols, then all PDCCH candidates in the search space set are not selected as the preserved PDCCH candidates.
  • a search space set includes at least one PDCCH candidate that overlaps with one or more flexible symbols, then all PDCCH candidates in the search space set are not selected as the preserved PDCCH candidates.
  • the base station configures search space set (s) for a terminal.
  • the configured search space set (s) can include common search space (CSS) set (s) and UE-specific search space (USS) set (s) .
  • a base station configures one CSS set and two USS sets for a terminal, in accordance with some embodiments.
  • the aggregation level and the number of PDCCH candidates included in the CSS set are illustrated in FIG. 3, and the PDCCH candidates’corresponding locations in slot n are shown in FIG. 4.
  • ′D′ denotes a fixed downlink symbol
  • ′X′ denotes a flexible symbol
  • ′U′ denotes a fixed uplink symbol.
  • a flexible symbol may be used for downlink transmission or uplink transmission.
  • the CSS set is configured as follows:
  • each PDCCH candidate time domain occupies 2 symbols;
  • ′D′ denotes a fixed downlink symbol
  • ′X′ denotes a flexible symbol
  • ′U′ denotes a fixed uplink symbol.
  • a flexible symbol may be used for downlink transmission or uplink transmission.
  • the USS set 1 is configured as follows:
  • each PDCCH candidate time domain occupies 2 symbols;
  • ′D′ denotes a fixed downlink symbol
  • ′X′ denotes a flexible symbol
  • ′U′ denotes a fixed uplink symbol.
  • a flexible symbol may be used for downlink transmission or uplink transmission.
  • the USS set 2 is configured as follows:
  • each PDCCH monitoring occasion in a PDCCH monitoring slot there is one PDCCH monitoring occasion in a PDCCH monitoring slot, the starting symbol index of the monitoring occasion in the monitoring slot is symbol 0, respectively, and each PDCCH candidate time domain occupies 2 symbols;
  • the base station selects, first from the CSS set and then from the USS sets, PDCCH candidates for preservation, until at least one of the number of PDCCH blind detections corresponding to the selected PDCCH candidate (s) or the number of CCEs corresponding to the selected PDCCH candidate (s) meets or exceeds a threshold. All of PDCCH candidates included in one search space set that have only downlink symbol (s) are either selected as preserved PDCCH candidates or discarded, as a whole.
  • the base station selects PDCCH candidate (s) based on symbol direction, where the symbol direction includes downlink symbol, uplink symbol, and flexible symbol.
  • Downlink symbol can mean that the transmission direction of the symbol is fixed to downlink.
  • Uplink symbol can mean that the transmission direction of the symbol is fixed to uplink.
  • Flexible symbol can mean that the transmission direction of the symbol can be either uplink or downlink.
  • Symbol direction can be determined based on indication signaling (s) . For example, symbol direction can be indicated by higher layer signaling or physical layer signaling.
  • a USS set includes at least one PDCCH candidate that overlaps with at least one of uplink symbol (s) or flexible symbol (s)
  • all PDCCH candidates of the USS set are discarded and not selected as preserved PDCCH candidates.
  • the base station can skip USS set (s) that has at least one PDCCH candidate overlapping with at least one of uplink symbol (s) or flexible symbol (s) .
  • the base station first selects 2 PDCCH candidates with aggregation level 4 in the CSS set.
  • the 2 selected PDCCH candidates do not include uplink symbol (s) or flexible symbol (s) , so these 2 PDCCH candidates are selected as preserved PDCCH candidates.
  • the base station After selecting the PDCCH candidates from the CSS set, the base station selects PDCCH candidate (s) from the USS sets.
  • the base station selects PDCCH candidate (s) in ascending order of USS set ID. Therefore, the base station first selects PDCCH candidate (s) from USS set 1.
  • the 3 PDCCH candidates on the occasion 1 include the uplink symbol, so the base station skips the entire USS set 1. In other words, the base station does not select any PDCCH candidate or USS set 1 as a preserved PDCCH candidate.
  • the base station continues to select PDCCH candidates from the USS set 2. As shown in FIG. 6, because none of the PDCCH candidates in the USS set 2 overlaps with the uplink symbol or flexible symbol, when neither the number of PDCCH blind detections corresponding to the selected PDCCH candidate (s) nor the number of CCEs corresponding to the selected PDCCH candidate (s) exceeds the threshold respectively, all PDCCH candidates in the USS set 2 are also selected as preserved PDCCH candidates.
  • the base station selects, among the preserved PDCCH candidates, one or more PDCCH candidates as the PDCCH (s) which the base station uses to send downlink control information (DCI) to at least one terminal.
  • DCI downlink control information
  • the at least one terminal can select PDCCH candidate (s) for preservation according to the same rule (s) as used by the base station, and monitor PDCCH (s) based the preserved PDCCH candidate (s) (e.g., the second group of resources) for communicating with the base station.
  • a slot that includes one or more wake-up PDCCH (WUP) PDCCH candidates can be divided into wake-up effective time (s) and wake-up ineffective time (s) (or dormant time (s) ) .
  • WUP wake-up PDCCH
  • the selection of PDCCH candidate (s) for preservation can be based on a first rule
  • the selection of PDCCH candidate (s) for preservation can be based on a second rule.
  • a base station configures search space set (s) for a terminal.
  • the configured search space set (s) can include common search space (CSS) set (s) and UE-specific search space (USS) set (s) .
  • the base station configures two CSS sets and two USS sets for a terminal, in accordance with some embodiments.
  • the base station configures one PDCCH candidate.
  • the base station configures two PDCCH candidates.
  • the base station configures 2 PDCCH candidates.
  • the base station configures 3 PDCCH candidates.
  • the 2 PDCCH candidates included in the USS set 2 are WUP PDCCH candidates, and the other PDCCH candidates are other purposes.
  • WUP is a physical downlink control channel used to notify terminal (s) of wake-up information, or a physical downlink control channel used to notify the notified or woken-up terminal (s) of relevant downlink control information.
  • the base station selects one or more WUP PDCCH candidates to serve as WUP channel (s) , which is used to send wake-up information to a terminal, or to send, to the terminal that has notified to wake up, some downlink control information required for downlink reception after wake-up. If a terminal is notified to wake up, it means that the terminal will receive communication on at least some non-WUP physical downlink channel (s) . If a terminal is not notified of wake-up, the terminal does not receive communication on at least some non-WUP physical downlink channel (s) .
  • the t1 time period is a wake-up ineffective time
  • the t2 time period is a wake-up effective time.
  • the wake-up ineffective time generally refers to a time period when the terminal is not woken up.
  • the wake-up effective time generally refers to a time period when the terminal wake-up takes effect.
  • Wake-up of the terminal is notified through relevant wake-up signal (s) and wake-up channel (s) .
  • a WUP is a physical downlink control channel for notifying terminal (s) of wake-up information, or a physical downlink control channel for informing the notified or woken-up terminal (s) of relevant downlink control information.
  • the base station selects to preserve PDCCH candidate (s) based on wake-up effective/ineffective times.
  • the base stations selects PDCCH candidate (s) according to a first rule; during the wake-up effective time, the base state selects PDCCH candidate (s) according to a second rule.
  • the first rule is:
  • the second rule is:
  • the base station first selects PDCCH candidate (s) according to the first rule in the wake-up ineffective time t1.
  • the first rule is that only WUP PDCCH candidates are selected as preserved PDCCH candidates.
  • the base station selects 2 PDCCH candidates in USS set 2 as preserved PDCCH candidates.
  • the base station selects PDCCH candidate (s) according to the second rule.
  • the second rule is that the base station preferentially selects PDCCH candidate (s) from search space set (s) of CSS type, and then selects from search space set (s) of USS type, and for each search space type, the base station selects PDCCH candidate (s) in ascending order of search space set ID.
  • the base station first selects PDCCH candidate from CSS set 0, then selects from USS set 3.
  • the PDCCH candidate in the CSS set 0 is selected as the a preserved PDCCH candidate, and neither the number of monitored PDCCH candidates corresponding to all preserved PDCCH candidates nor the number of CCEs corresponding to the preserved PDCCH candidates exceeds a certain threshold respectively.
  • the PDCCH candidates in the USS set 3 are also selected as preserved PDCCH candidates, at least one of the number of monitored PDCCH candidates corresponding to all preserved PDCCH candidates or the number of CCEs corresponding to the reserved PDCCH candidates may exceed the threshold. Therefore, during the wake-up effective time t2, the base station only selects the PDCCH candidate in the CSS set 0 as a preserved PDCCH candidate.
  • the base station selects, from the preserved PDCCH candidates, one or more PDCCH candidates as the PDCCH channel (s) which the base station uses to send downlink control information (DCI) to at least one terminal.
  • DCI downlink control information
  • the at least one terminal can select PDCCH candidate (s) for preservation according to the same rule (s) as used by the base station, and monitor PDCCH (s) based the preserved PDCCH candidate (s) (e.g., the second group of resources) for communicating with the base station.
  • the order for selecting PDCCH candidates from USS sets is based on the following two methods:
  • a base station configures search space set (s) for a terminal.
  • the configured search space set (s) can include common search space (CSS) set (s) and UE-specific search space (USS) set (s) .
  • CCS common search space
  • USS UE-specific search space
  • the base station configures one CSS set and three USS sets for a terminal, in accordance with some embodiments.
  • the base station configures 2 PDCCH candidates.
  • the base station configures 3 PDCCH candidates.
  • the base station configures 4 PDCCH candidates, including 2 PDCCH candidates as WUP PDCCH candidates and 2 non-WUP PDCCH candidates.
  • the base station configures 2 PDCCH candidates.
  • WUP is a physical downlink control channel used to notify terminal (s) of wake-up information, or a physical downlink control channel used to notify the notified or woken-up terminal (s) of relevant downlink control information.
  • the base station selects one or more WUP PDCCH candidates to serve as WUP channel (s) , which is used to send wake-up information to a terminal, or to send, to the terminal that has notified to wake up, some downlink control information required for downlink reception after wake-up. If a terminal is notified to wake up, it means that the terminal will receive communication on at least some non-WUP physical downlink channel (s) . If a terminal is not notified of wake-up, the terminal does not receive communication on at least some non-WUP physical downlink channel (s) .
  • the base station selects PDCCH candidate (s) for preservation according to a certain search space set order.
  • USS set (s) including WUP PDCCH candidate (s) has a higher priority than other USS set (s) .
  • the base station selects PDCCH candidate (s) in ascending order of search space set ID.
  • all of the PDCCH candidates in a search space set are either selected as preserved PDCCH candidates or discarded.
  • the base station first selects 2 PDCCH candidates in the CSS set as preserved PDCCH candidates, in accordance with an order of “first CSS then USS. ” Then, the base station selects PDCCH candidate (s) from the USS sets to preserve. Within the USS sets, the base station preferentially selects PDCCH candidate (s) in the USS set (s) containing WUP PDCCH candidate (s) .
  • the base station selects 4 PDCCH candidates in the USS set 2 for preservation.
  • the base station After selecting from USS set (s) including WUP PDCCH candidate (s) , the base station selects PDCCH candidate (s) from other USS sets in ascending order of search space set ID.
  • the USS sets that do not contain WUP PDCCH candidate (s) are USS set1 and USS set3. Therefore, the base station selects the 3 PDCCH candidates in the USS set 1 for preservation, as long as neither number of the monitored PDCCH candidates corresponding to the preserved PDCCH candidates nor the number of CCEs corresponding to the preserved PDCCH candidates exceeds the threshold value respectively.
  • the base station After selecting from USS set1, the base station determines whether to select PDCCH candidate (s) from USS set 3 for preservation. For example, if the base station selects the 2 PDCCH candidates in the USS set 3, at least one of the number of monitored PDCCH candidates corresponding to the preserved PDCCH candidates or the number of CCEs corresponding to the preserved PDCCH candidates exceeds the threshold, then the base station does not select from the USS set 3.
  • the base station selects, from the preserved PDCCH candidates, one or more PDCCH candidates as the PDCCH channel (s) which the base station uses to send downlink control information (DCI) to at least one terminal.
  • DCI downlink control information
  • the at least one terminal can select PDCCH candidate (s) for preservation according to the same rule (s) as used by the base station, and monitor PDCCH (s) based the preserved PDCCH candidate (s) (e.g., the second group of resources) for communicating with the base station.
  • a USS set includes at least one WUP PDCCH candidate, then the at least one WUP PDCCH candidate is preferentially preserved.
  • a base station configures search space set (s) for a terminal.
  • the configured search space set (s) can include common search space (CSS) set (s) and UE-specific search space (USS) set (s) .
  • CCS common search space
  • USS UE-specific search space
  • the base station configures one CSS set and three USS sets for a terminal, in accordance with some embodiments.
  • the base station configures 2 PDCCH candidates.
  • the base station configures 3 PDCCH candidates.
  • the base station configures 4 PDCCH candidates, including 2 PDCCH candidates as WUP PDCCH candidates and 2 non-WUP PDCCH candidates.
  • the base station configures 2 PDCCH candidates.
  • WUP is a physical downlink control channel used to notify terminal (s) of wake-up information, or a physical downlink control channel used to notify the notified or woken-up terminal (s) of relevant downlink control information.
  • the base station selects one or more WUP PDCCH candidates to serve as WUP channel (s) , which is used to send wake-up information to a terminal, or to send, to the terminal that has notified to wake up, some downlink control information required for downlink reception after wake-up. If a terminal is notified to wake up, it means that the terminal will receive communication on at least some non-WUP physical downlink channel (s) . If a terminal is not notified of wake-up, the terminal does not receive communication on at least some non-WUP physical downlink channel (s) .
  • the base station selects PDCCH candidate (s) according to a certain search space set order. In some embodiments, the base station preferentially selects WUP PDCCH candidate (s) in a search space set for preservation.
  • the base station first selects 2 PDCCH candidates in the CSS set as preserved PDCCH candidates, in accordance with an order of “first CSS then USS. ” Then, the base station selects PDCCH candidate (s) from the USS sets to preserve. Within the USS sets, the base station preferentially processes the USS set (s) containing WUP PDCCH candidate (s) and preferentially selects WUP PDCCH candidate (s) from such USS set (s) .
  • the base station determines whether the WUP PDCCH candidates in the USS set 2 should be preserved. For example, if neither the number of monitored PDCCH candidates corresponding to all preserved PDCCH candidates nor the number of CCEs corresponding to the preserved PDCCH candidates exceeds a certain threshold value respectively, the base station selects the 2 WUP PDCCH candidates in USS set 2 as preserved PDCCH candidate.
  • the base station After the base station preserves the WUP PDCCH candidates in the USS set 2, the base station continues to determine whether to preserve other PDCCH candidates in the USS set 2. If by selecting the other PDCCH candidates in the USS set 2 as preserved PDCCH candidates, at least one of the number of monitored PDCCH candidates corresponding to all preserved PDCCH candidates or the number of CCEs corresponding to the preserved PDCCH candidates exceeds the threshold, then the non-WUP PDCCH candidates in USS set 2 are not selected for preservation.
  • the base station selects, from the preserved PDCCH candidates, one or more PDCCH candidates as the PDCCH channel (s) which the base station uses to send downlink control information (DCI) to at least one terminal.
  • DCI downlink control information
  • the at least one terminal can select PDCCH candidate (s) for preservation according to the same rule (s) as used by the base station, and monitor PDCCH (s) based the preserved PDCCH candidate (s) (e.g., the second group of resources) for communicating with the base station.
  • selecting PDCCH candidate (s) for preservation can be based on one or more of the following rules:
  • a base station configures search space set (s) for a terminal.
  • the configured search space set (s) can include common search space (CSS) set (s) and UE-specific search space (USS) set (s) .
  • CCS common search space
  • USS UE-specific search space
  • the base station configures one CSS set and three USS sets for a terminal, in accordance with some embodiments.
  • the base station configures 2 PDCCH candidates.
  • the base station configures 3 PDCCH candidates.
  • the base station configures 4 PDCCH candidates, including 2 PDCCH candidates as WUP PDCCH candidates and 2 non-WUP PDCCH candidates.
  • the base station configures 2 PDCCH candidates.
  • WUP is a physical downlink control channel used to notify terminal (s) of wake-up information, or a physical downlink control channel used to notify the notified or woken-up terminal (s) of relevant downlink control information.
  • the base station selects one or more WUP PDCCH candidates to serve as WUP channel (s) , which is used to send wake-up information to a terminal, or to send, to the terminal that has notified to wake up, some downlink control information required for downlink reception after wake-up. If a terminal is notified to wake up, it means that the terminal will receive communication on at least some non-WUP physical downlink channel (s) . If a terminal is not notified of wake-up, the terminal does not receive communication on at least some non-WUP physical downlink channel (s) .
  • the base station selects PDCCH candidate (s) for preservation based on one or more of the following rules:
  • the base station only selects (a) WUP PDCCH candidate (s) and (b) PDCCH candidate (s) in CSS set (s) .
  • the base station selects the 2 PDCCH candidates in the CSS set and 2 WUP PDCCH candidates in the USS set 2 as preserved PDCCH candidates.
  • the base station selects, from the preserved PDCCH candidates, one or more PDCCH candidates as the PDCCH channel (s) which the base station uses to send downlink control information (DCI) to at least one terminal.
  • DCI downlink control information
  • the at least one terminal can select PDCCH candidate (s) for preservation according to the same rule (s) as used by the base station, and monitor PDCCH (s) based the preserved PDCCH candidate (s) (e.g., the second group of resources) for communicating with the base station.
  • a base station indicates, within a first group of resources, a second group of resources by signaling.
  • the first group of resources can be divided into multiple resources according to a predefined rule, and the base station can indicate one or more resource indexes.
  • the base station can indicate the second group of resources by signaling in at least one of the following ways:
  • high-layer signaling e.g., RRC signaling
  • the base station indicates one or more resources of the first group of resources as the second group of resources, the base station selects one or more resources from the second group of resources as physical downlink control channel (s) which the base station uses to send downlink control information (DCI) to at least one terminal.
  • DCI downlink control information
  • the first group of resources includes a time-frequency resource (s) occupied by CORESET (s) corresponding to one or more search space sets in a slot or in an occasion of a slot.
  • the base station indicates one or more resources in the first set of resources, to constitute the second group of resources.
  • the base station selects one or more PDCCH candidates from the second group as PDCCH channel (s) for transmitting downlink control information to at least one terminal.
  • the base station configures search space set 1 and search space set 2 for a terminal.
  • a search space set can include PDCCH resources with different aggregation levels.
  • an individual search space set only includes PDCCH candidate (s) with aggregation level L.
  • the base station determines that the resource (s) of CORESET 1 in slot n that corresponds to search space set 1 is the time-frequency resource (s) of CORESET 1 on Occasion 0 and Occasion 1, based on the following configurations:
  • search space set 1 corresponds to CORESET 1, and CORESET 1’s time domain duration is 2 symbols;
  • search space set 1 has 2 PDCCH monitoring occasions in one slot, and the starting symbol indexes of the occasions are symbol 0 and symbol 5, respectively.
  • the base station determines that the resource (s) of CORESET 1 in slot n that corresponds to search space set 2 is the time-frequency resource (s) of CORESET 1 on Occasion 0, based on the following configurations:
  • search space set 2 corresponds to CORESET 1, and CORESET 1’s time domain duration is 2 symbols;
  • search space set 2 has 1 PDCCH monitoring occasion in one slot, and the starting symbol index of the occasion is symbol 0.
  • the base station indicates one or more resources of the first group of resources as the second group of resources, and the second group of resources include one or more PDCCH candidates. More specifically, the first group of resources corresponds to one or more search space sets of time-frequency resources occupied by CORESET in one time slot.
  • the first group of resources is the time frequency resource (s) of CORESET 1 on Occasion 0 in slot n that corresponds to search space set 2.
  • the base station indicates resource (s) in the first group as the second group of resources. This can be achieved by the base station indicating at least one of (a) one or more aggregation levels or (b) one or more resource indexes corresponding to aggregation level L.
  • the resource index i indicated by the base station corresponds to CCE indexes i*L to (i+1) *L -1.
  • the second group of resources indicated by the base station for search space set 2 corresponds to PDCCH candidate (s) whose resource indexes are 0 and 7 on Occasion 0 in slot n.
  • the first group of resources is the time-frequency resource (s) of CORSESET1 on Occasion 0 and Occasion 1 in slot n that corresponds to search space set 1.
  • the second group of resources include PDCCH candidates whose resource indexes are 2, 6 on Occasion 0 and Occasion 1 in slot n, as shown in FIG. 10.
  • the PDCCH candidate position (s) in search space set 1 can be determined by other methods.
  • the base station selects, from the second group of resources, one or more PDCCH candidates as the PDCCH channel (s) which the base station uses to send downlink control information (DCI) to at least one terminal.
  • DCI downlink control information
  • the at least one terminal can select one or more PDCCH candidate resources for preservation as instructed by the base station via signaling, and monitor PDCCH (s) based on the preserved PDCCH candidates for communicating with the base station.
  • a base station determines, from a first group of resources, one or more resources as a second group of resources according to certain rule (s) .
  • the certain rule (s) include a first rule and a second rule.
  • the base station determines, according to the first rule, one or more resources in the first group of resources.
  • the resource (s) determined according to the first rule is referred to as a first part of resource (s) .
  • the base station determines, according to the second rule, one or more resources in the first set of resources.
  • the resource (s) determined according to the second rule is referred to as a second part of resource (s) .
  • the second group of resources determined by the base station includes resource (s) of the first part and the second part.
  • search space set (s) configured by the base station for a terminal includes search space set 1.
  • Search space set 1 can include PDCCH candidate (s) with different aggregation levels.
  • an individual search space set only includes PDCCH candidate (s) with aggregation level L.
  • the time-frequency resource (s) of CORESET 1 in slot n is the time-frequency resource (s) of CORESET 1 on Occasion 0.
  • the time-frequency resource (s) of CORESET 1 on Occasion0 in slot n constitutes the first group of resources.
  • the base station selects the resources numbered 3 and 7 in FIG. 11, as the first part of resources according to the first rule.
  • the first rule can be based on the LTE ePDCCH Hashing function.
  • the base station selects the resources numbered 0 and 5 in FIG. 11, as the second part of resources.
  • the second rule can be a random selection of two resources in the first group of resource sets except resources numbered 3 and 7.
  • the base station determines the resources of the first part and the second part, i.e., the resources numbered 0, 3, 5, and 7 in FIG. 11, constitute the second group of resources.
  • the base station selects, from the second group of resources, one or more PDCCH candidates as the PDCCH channel (s) which the base station uses to send downlink control information (DCI) to at least one terminal.
  • DCI downlink control information
  • the at least one terminal can select one or more PDCCH candidate resources for preservation based on calculations according to the same rules as indicated above, and monitor PDCCH (s) based on the preserved PDCCH candidates for communication with the base station.
  • FIG. 12 shows an example of a wireless communication system where techniques in accordance with one or more embodiments of the present technology can be applied.
  • a wireless communication system 1200 can include one or more base stations (BSs) 1205a, 1205b, one or more wireless devices (e.g., terminals or UEs) 1210a, 1210b, 1210c, 1210d, and an access network 1225.
  • a base station 1205a, 1205b can provide wireless service to wireless devices 1210a, 1210b, 1210c and 1210d in one or more wireless sectors.
  • a base station 1205a, 1205b includes directional antennas to produce two or more directional beams to provide wireless coverage in different sectors.
  • the access network 1225 can communicate with one or more base stations 1205a, 1205b.
  • the access network 1225 includes one or more base stations 1205a, 1205b.
  • the access network 1225 is in communication with a core network (not shown in FIG. 12) that provides connectivity with other wireless communication systems and wired communication systems.
  • the core network may include one or more service subscription databases to store information related to the subscribed wireless devices 1210a, 1210b, 1210c and 1210d.
  • a first base station 1205a can provide wireless service based on a first radio access technology
  • a second base station 1205b can provide wireless service based on a second radio access technology.
  • the base stations 1205a and 1205b may be co-located or may be separately installed in the field according to the deployment scenario.
  • the access network 1225 can support multiple different radio access technologies.
  • a wireless communication system can include multiple networks using different wireless technologies.
  • a dual-mode or multi-mode wireless device includes two or more wireless technologies that could be used to connect to different wireless networks.
  • FIG. 13 is a block diagram representation of a portion of a radio station.
  • a radio station 1305 such as a base station or a terminal (or UE) can include processor electronics 1310 such as a microprocessor that implements one or more of the wireless techniques presented in this document.
  • the radio station 1305 can include transceiver electronics 1315 to send and/or receive wireless signals over one or more communication interfaces such as antenna 1320.
  • the radio station 1305 can include other communication interfaces for transmitting and receiving data.
  • Radio station 1305 can include one or more memories (not explicitly shown) configured to store information such as data and/or instructions.
  • the processor electronics 1310 can include at least a portion of the transceiver electronics 1315. In some embodiments, at least some of the disclosed techniques, modules or functions are implemented using the radio station 1305.
  • a computer-readable medium may include removable and non-removable storage devices including, but not limited to, Read Only Memory (ROM) , Random Access Memory (RAM) , compact discs (CDs) , digital versatile discs (DVD) , etc. Therefore, the computer-readable media can include a non-transitory storage media.
  • program modules may include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types.
  • Computer-or processor-executable instructions, associated data structures, and program modules represent examples of program code for executing steps of the methods disclosed herein. The particular sequence of such executable instructions or associated data structures represents examples of corresponding acts for implementing the functions described in such steps or processes.
  • a hardware circuit implementation can include discrete analog and/or digital components that are, for example, integrated as part of a printed circuit board.
  • the disclosed components or modules can be implemented as an Application Specific Integrated Circuit (ASIC) and/or as a Field Programmable Gate Array (FPGA) device.
  • ASIC Application Specific Integrated Circuit
  • FPGA Field Programmable Gate Array
  • DSP digital signal processor
  • the various components or sub-components within each module may be implemented in software, hardware or firmware.
  • the connectivity between the modules and/or components within the modules may be provided using any one of the connectivity methods and media that is known in the art, including, but not limited to, communications over the Internet, wired, or wireless networks using the appropriate protocols.

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

Abstract

La présente invention concerne des procédés, des systèmes et des dispositifs liés à la communication sans fil numérique. Un procédé de communication sans fil basé sur la sélection de ressources candidates de PDCCH consiste à sélectionner, dans un premier groupe de ressources, un second groupe de ressources sur la base d'au moins une direction de symbole, un temps effectif de réveil, une utilisation de ressource ou une signalisation. Le procédé consiste également à réaliser une communication sans fil sur la base, au moins en partie, d'une ou de plusieurs ressources du second groupe de ressources.
PCT/CN2018/099607 2018-08-09 2018-08-09 Procédé et appareil de sélection de ressource WO2020029172A1 (fr)

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