WO2025236128A1 - Procédé d'amélioration de couverture de liaison descendante pour station de base et équipement utilisateur - Google Patents

Procédé d'amélioration de couverture de liaison descendante pour station de base et équipement utilisateur

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Publication number
WO2025236128A1
WO2025236128A1 PCT/CN2024/092729 CN2024092729W WO2025236128A1 WO 2025236128 A1 WO2025236128 A1 WO 2025236128A1 CN 2024092729 W CN2024092729 W CN 2024092729W WO 2025236128 A1 WO2025236128 A1 WO 2025236128A1
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WO
WIPO (PCT)
Prior art keywords
repetition
pdcch
pdsch
coverage enhancement
enhancement method
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/CN2024/092729
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English (en)
Inventor
Yiwei DENG
Kai Liu
Yu Ding
Shahid JAN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen TCL New Technology Co Ltd
Original Assignee
Shenzhen TCL New Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen TCL New Technology Co Ltd filed Critical Shenzhen TCL New Technology Co Ltd
Priority to PCT/CN2024/092729 priority Critical patent/WO2025236128A1/fr
Publication of WO2025236128A1 publication Critical patent/WO2025236128A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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 signalling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal

Definitions

  • the present invention relates to wireless communication, more specifically to downlink coverage enhancement method for base station (BS) and user equipment (UE) .
  • Coverage is one of the key factors that an operator considers when commercializing cellular communication networks due to its direct impact on service quality as well as CAPEX and OPEX. Despite the importance of coverage on the success of NR commercialization, a thorough coverage evaluation and a comparison with legacy RATs considering all NR specification details have not been done up to now.
  • New Radio is designed to operate at much higher frequencies such as 28GHz or 39GHz in FR2.
  • FR1 such as 3.5GHz
  • 3.5GHz is typically in higher frequencies than for LTE or 3G. Due to the higher frequencies, it is inevitable that the wireless channel will be subject to higher path-loss making it more challenging to maintain an adequate quality of service that is at least equal to that of legacy RATs.
  • voice service for which a typical subscriber will always expect a ubiquitous coverage wherever s/he is.
  • NR can be deployed either in newly allocated spectrums, such as 3.5GHz, or in a spectrum re-farmed from a legacy network, e.g., 3G and 4G. In either case, coverage will be a critical issue considering the fact that these spectrums will most likely handle key mobile services such as voice and low-rate data services.
  • coverage was not thoroughly evaluated during the self-evaluation campaign towards IMT-2020 submission and not considered in Rel-16 enhancements. In these regards, a thorough understanding of NR coverage performance is needed while taking into account the support of latest NR specification, and thus, in Rel-17 and Rel-18, coverage enhancements for uplink (UL) channel has been studied.
  • An objective of the present disclosure is to propose solutions or schemes that address at least of the aforementioned issues.
  • the present invention discloses a downlink coverage enhancement method, executed by a base station (BS) .
  • the method comprises configuring a plurality of repetition transmissions of a physical downlink control channel (PDCCH) across at least one of a plurality of control resource sets (CORESETs) , a plurality of search spaces (SS) , a plurality of symbols, or a plurality of slots.
  • PDCCH physical downlink control channel
  • CORESETs control resource sets
  • SS search spaces
  • the present invention further discloses a downlink coverage enhancement method, executed by a user equipment (UE) .
  • the method comprises receiving a plurality of repetition transmissions of a physical downlink control channel (PDCCH) across at least one of a plurality of control resource sets (CORESETs) , a plurality of search spaces (SS) , a plurality of symbols, or a plurality of slots.
  • PDCCH physical downlink control channel
  • CORESETs control resource sets
  • SS search spaces
  • symbols a plurality of symbols
  • a plurality of slots a plurality of symbols
  • the present invention further discloses a downlink coverage enhancement method, executed by a base station.
  • the method comprises configuring an enlarged control channel element (CCE) aggregation level (AL) for a physical downlink control channel (PDCCH) .
  • CCE control channel element
  • A enlarged control channel element
  • PDCCH physical downlink control channel
  • the present invention further discloses a downlink coverage enhancement method, executed by a user equipment (UE) .
  • the method comprises receiving an enlarged control channel element (CCE) aggregation level (AL) for a physical downlink control channel (PDCCH) .
  • CCE control channel element
  • A enlarged control channel element
  • PDCCH physical downlink control channel
  • the present invention further discloses a downlink coverage enhancement method, executed by a base station.
  • the method comprises configuring a sparsified Demodulation Reference Signal (DMRS) pattern.
  • DMRS Demodulation Reference Signal
  • the present invention further discloses a downlink coverage enhancement method, executed by a base station.
  • the method comprises configuring a plurality of repetition transmissions of a physical downlink share channel (PDSCH) , or configuring a transport block (TB) of a transmission of the PDSCH over a plurality of slots, or configuring the PDSCH with DMRS-bundling.
  • PDSCH physical downlink share channel
  • TB transport block
  • the present invention further discloses a downlink coverage enhancement method, executed by a user equipment (UE) .
  • the method comprises receiving a plurality of repetition transmissions of a physical downlink share channel (PDSCH) ; or receiving a transport block (TB) of a transmission of the PDSCH over a plurality of slots; or receiving a DMRS-bundling indication of the PDSCH.
  • PDSCH physical downlink share channel
  • TB transport block
  • the present invention further discloses a downlink coverage enhancement method, executed by a base station.
  • the method comprises configuring a plurality of repetition transmissions of a system information block (SIB) 19, or configuring the SIB 19 with DMRS bundling, or configuring the SIB 19 over a plurality of slots.
  • SIB system information block
  • the present invention further discloses a downlink coverage enhancement method, executed by a user equipment (UE) .
  • the method comprises receiving a plurality of repetition transmissions of a system information block (SIB) 19, or receiving a DMRS bundling indication of the SIB 19, or receiving the SIB 19 over a plurality of slots.
  • SIB system information block
  • the present invention further discloses an apparatus for wireless communication, comprising a processor and a memory.
  • the memory is configure to store program instructions which, when executed by the processor, causes the processor to perform the method of any of above paragraphs.
  • the present invention further discloses a computer readable media storing program instructions that, when executed by a processor, cause the processor to perform the method of any of above paragraphs.
  • a set of downlink channels (SIB19, Msg4 PDSCH, PDSCH, PDCCH, etc, ) under NTN scenario may be coverage bottleneck channels
  • coverage capacity can be improved based on the methods proposed in this disclosure.
  • mechanisms such as DMRS-less, DMRS-bundling, etc. are also disclosed.
  • FIG. 1 is a flow chart of the downlink coverage enhancement method executed by a base station according to the present disclosure.
  • FIG. 2 is a flow chart of the downlink coverage enhancement method executed by a user equipment according to the present disclosure.
  • FIG. 3 depicts PDCCH repetition in time domain according to the present disclosure.
  • FIG. 4 depicts PDCCH repetition in time domain with non-back-to-back mapping according to the present disclosure.
  • FIG. 5 depicts PDCCH repetition in time domain and with frequency offset according to the present disclosure.
  • FIG. 6 depicts PDCCH repetition in time domain and with frequency offset according to the present disclosure.
  • FIG. 7 depicts PDCCH repetition in frequency domain according to the present disclosure.
  • FIG. 8 depicts PDCCH repetition based on time and frequency domain according to the present disclosure.
  • FIG. 9 depicts PDCCH repetition based on time and frequency domain according to the present disclosure.
  • FIG. 10 is a flow chart of the downlink coverage enhancement method executed by a base station according to the present disclosure.
  • FIG. 11 is a flow chart of the downlink coverage enhancement method executed by a user equipment according to the present disclosure.
  • FIG. 12 is a flow chart of the downlink coverage enhancement method executed by a base station according to the present disclosure.
  • FIG. 13 depicts DMRS for PDCCH with sparse DMRS pattern in frequency domain according to the present disclosure.
  • FIG. 14 depicts a set of symbols of PDCCH with no DMRS according to the present disclosure.
  • FIG. 15 is a flow chart of the downlink coverage enhancement method executed by a base station according to the present disclosure.
  • FIG. 16 is a flow chart of the downlink coverage enhancement method executed by a user equipment according to the present disclosure.
  • FIG. 17 depicts RV cycling based on all PDSCH transmission according to the present disclosure.
  • FIG. 18 depicts RV cycling based on configured PDSCH transmission according to the present disclosure.
  • FIG. 19 depicts procedure of 4-step RACH according to the present disclosure.
  • FIG. 20 is a flow chart of the downlink coverage enhancement method executed by a base station according to the present disclosure.
  • FIG. 21 is a flow chart of the downlink coverage enhancement method executed by a user equipment according to the present disclosure.
  • FIG. 22 depicts a schematic view of the apparatus according to the present disclosure.
  • UL coverage enhancements have been specified as part of NR NTN enhancements, such as repetition and Demodulation Reference Signal (DMRS) bundling.
  • DMRS Demodulation Reference Signal
  • the link level evaluation identified UL coverage as the bottleneck.
  • the evaluation assumptions did not take into account DL satellite power split among multiple DL satellite beams.
  • the power reduction due to beam splitting is tightly related to the dedicated deployment.
  • a satellite supporting more simultaneous active satellite beams can result in larger serving area.
  • it also leads to more reduction for the transmission power over a single beam, naturally yielding more reduced per-beam SNR.
  • the first issue is that DL bottleneck channels under NTN, the channels such as PDCCH for SIBx/Msg2/Msg4, PDCCH, Msg4 PDSCH, SIB 19 PDSCH, PDSCH can be considered.
  • Transport Block Size (TBS) determination PDCCH with DMRS-bundling, in addition, to further decrease the code rate of PDCCH, DMRS-less.
  • RACH Random Access Channel
  • a Ra-ResponseWindow will be starting, during the RAR window, UE need to monitor a Ransom Access Response (RAR) , after UE detection RAR correctly, then transmission Msg3 based on the grant within RAR, after transmission of Msg3, UE need to receive Msg4 during a ra-contentionResolutionTimer, when UE is received the Msg4 correctly, a corresponding Hybrid Automatic Repeat request-ACKnowledgement (HARQ-ACK) of Msg4 is transmitted by user device.
  • RAR Ransom Access Response
  • HARQ-ACK Hybrid Automatic Repeat request-ACKnowledgement
  • Ra-ResponseWindow and ra-contentionResolutionTimer is ⁇ sl1, sl2, sl4, sl8, sl10, sl20, sl40, sl80 ⁇ and ⁇ sf8, sf16, sf24, sf32, sf40, sf48, sf56, sf64 ⁇ respectively, which is defined in TS 38.331.
  • the third issue is misalignment between Ra-ResponseWindow and Msg2 PDSCH with repetition and/or Msg2 PDSCH processing over multiple slots
  • the fourth issue is misalignment between ra-contentionResolutionTimer and Msg4 PDSCH with repetition and/or Msg4 PDSCH processing over multiple slots.
  • NTN enhancements was approved in Rel-19.
  • One of an objective of this work item is to study potential coverage bottleneck channels and corresponding enhancements.
  • the detailed objectives are defining the corresponding power sharing assumptions and necessary link level and system level evaluation methodology and relevant KPIs for evaluations of the coverage, to allow for identification of physical channels/signals and system-level aspects that need enhancements and the corresponding needed improvements; studying and if needed specify solutions, including link level enhancements for FR1-NTN (e.g.
  • Physical Downlink Control Channel (PDCCH) , Physical Downlink Shared Channel (PDSCH) ) and/or system level enhancements for FR1-NTN and/or FR2-NTN, allowing dynamic and flexible power sharing between satellite beams or different satellite beam patterns/size (i.e. wide or narrow) across the satellite footprint.
  • PDCCH Physical Downlink Control Channel
  • PDSCH Physical Downlink Shared Channel
  • SSB channel enhancement is not considered.
  • Antenna gain of UE shall be assumed to be -5.5dBi in case of smartphone in FR1-NTN, the UE is assumed to be a full duplex UE, and at least 2Rx are considered at the UE.
  • This disclosure proposes method (s) to improve the coverage capacity of PDCCH for SIBx/Msg4/Msg2/paging scheduling, PDCCH for SIBx/Msg4/Msg2 scheduling with repetition, high level aggregation CCE of the PDCCH for SIBx/Msg4/Msg2/paging scheduling, the PDCCH for SIBx/Msg4/Msg2/paging scheduling across more than one Control Resource Set (CORESET) .
  • CORESET Control Resource Set
  • the present invention disclose a downlink coverage enhancement method, executed by a base station (BS) .
  • the method comprises: operation S102, configuring a plurality of repetition transmissions of a physical downlink control channel (PDCCH) across at least one of a plurality of control resource sets (CORESETs) , a plurality of search spaces (SS) , a plurality of symbols, or a plurality of slots.
  • PDCCH physical downlink control channel
  • CORESETs control resource sets
  • SS search spaces
  • symbols a plurality of symbols
  • a plurality of slots a plurality of symbols
  • the PDCCH schedules one of a system information block (SIB) , a random access response (Msg2) , a contention resolution (Msg4) , and a paging.
  • SIB system information block
  • Msg2 random access response
  • Msg4 contention resolution
  • paging a paging
  • the downlink coverage enhancement method further comprises transmitting an indication for enabling the repetition transmissions of the PDCCH and for indicating a repetition amount of the PDCCH.
  • the repetition pattern is continuous in a time domain, and a frequency resource of each of the repetition transmissions is the same.
  • the repetition pattern is discontinuous in a time domain, there is a time offset between two adjacent repetition transmissions, the time offset is configured by the base station, and a frequency resource of each of the repetition transmissions is the same.
  • the repetition pattern is continuous in a time domain
  • the repetition transmissions comprise a plurality of repetition groups
  • the repetition transmissions within a same repetition group are spaced with a time offset
  • the repetition groups are configured with different frequency resources respectively
  • a frequency offset between the repetitions groups is indicated by the base station.
  • the repetition pattern is continuous in a frequency domain, and a time resource of each of the repetition transmissions is the same.
  • downlink coverage enhancement method further comprises the indicating a DMRS-bundling to bundle a plurality of DMRS symbols of the PDCCH as an entity.
  • the PDCCH schedules a physical downlink share channel (PDSCH)
  • the downlink coverage enhancement method further comprises indicating a number of the repetition transmissions of the PDCCH via ControlResourceSet or SearchSpace.
  • the present invention further discloses a downlink coverage enhancement method, executed by a user equipment (UE) .
  • the method comprises: operation S202, receiving a plurality of repetition transmissions of a physical downlink control channel (PDCCH) across at least one of a plurality of control resource sets (CORESETs) , a plurality of search spaces (SS) , a plurality of symbols, or a plurality of slots.
  • PDCCH physical downlink control channel
  • CORESETs control resource sets
  • SS search spaces
  • symbols a plurality of symbols
  • the downlink coverage enhancement method comprises receiving an indication for enabling the repetition transmissions of the PDCCH and for indicating a repetition amount of the PDCCH.
  • the repetition pattern is continuous in a time domain, and a frequency resource of each of the repetition transmissions is the same; or the repetition pattern is discontinuous in a time domain, there is a time offset between two adjacent repetition transmissions, the time offset is configured by the base station, and a frequency resource of each of the repetition transmissions is the same; or the repetition pattern is continuous in a time domain, the repetition transmissions comprise a plurality of repetition groups, wherein repetition transmissions within a same repetition group are spaced with a time offset, the repetition groups are configured with different frequency resources respectively, and a frequency offset between the repetitions groups is indicated by the base station; or the repetition pattern is continuous in a frequency domain, and a time resource of each of the repetition transmissions is the same.
  • the downlink coverage enhancement method further comprises receiving a DMRS-bundling indication to bundle a plurality of DMRS symbols of the PDCCH as an entity; and performing a channel estimation based on the entity.
  • PDCCH can be enabled repetition, the repetition of PDCCH need to across multiple CORESET and/or multiple SS (Search Space) or multiple symbols or multiple slots, the time resources and/or frequency resources are used for PDCCH repetition can be same or different. In this way, the coverage capacity for PDCCH can be achieved.
  • the number of repetition for PDCCH can be indicated by gNB via pdcch-ConfigSIB1 or searchSpaceSIB1 or searchSpaceZero or SIB1 or MIB. Where pdcch-ConfigSIB1 or searchSpaceSIB1 or searchSpaceZero is defined in TS 38.213.
  • the repetition pattern of PDCCH can be based on time domain without frequency offset, which means, the repetition of PDCCH can be across multiple CORESET or SS in time domain and the frequency resources for PDCCH repetition is the same (same with the first repetition of the PDCCH) .
  • the PDCCH repetition is consecutive or back-to-back in time domain, take CORESET size with 2 symbols and 4 repetition of PDCCH repetition as an example, as show in FIG. 3.
  • the repetition pattern of PDCCH can be based on time domain without frequency offset, which means, the repetition of PDCCH can be across multiple CORESET or SS in time domain and the frequency resources for PDCCH repetition is the same (same with the first repetition of the PDCCH) .
  • the PDCCH repetition is non-consecutive or non-back-to-back in time domain, the time offset between two adjacent PDCCH repetition is the same, and the time offset between 2 PDCCH repetition is configured by gNB via RRC or MAC-CE or DCI or SIB1 or MIB or the time off set is pre-defined, e.g., equal to multiple time (s) of CORESET size in time domain, take CORESET size with 2 symbols and 4 repetition of PDCCH repetition as an example, as show in FIG. 4. In this way, time domain diversity gain can be achieved, thus, the coverage capacity of PDCCH can be improved.
  • the repetition pattern of PDCCH can be based on time domain with frequency offset, which means, the repetition of PDCCH can be across multiple CORESET or SS in time domain and the frequency resources for PDCCH repetition is different between different PDCCH repetition groups.
  • a PDCCH repetition group include at least one PDCCH repetition, the frequency resources for PDCCH repetition within a PDCCH repetition group are the same.
  • the PDCCH repetition is consecutive or back-to-back in time domain, the frequency offset between PDCCH repetition groups can be indicated by gNB via RRC or MAC-CE or DCI or SIB1 or MIB or SIBx. Take CORESET size with 2 symbols and 4 repetition of PDCCH repetition as an example, as show in FIG. 5.
  • the repetition pattern of PDCCH can be based on time domain with frequency offset, which means, the repetition of PDCCH can be across multiple CORESET or SS in time domain and the frequency resources for PDCCH repetition is different between different PDCCH repetition groups, a PDCCH repetition group include at least one PDCCH repetition, the frequency resources for PDCCH repetition within a PDCCH repetition group are the same, the PDCCH repetition is non-consecutive or non-back-to-back in time domain, the frequency offset between PDCCH repetition groups can be indicated by gNB via RRC or MAC-CE or DCI or SIB1 or MIB or SIBx, the time offset between 2 PDCCH repetition is configured by gNB via RRC or MAC-CE or DCI or SIB1 or MIB or the time off set is pre-defined, e.g., equal to multiple time (s) of CORESET size in time domain. Take CORESET size with 2 symbols and 4 repetition of PDCCH repetition as an example, as show in FIG. 6.
  • the repetition pattern of PDCCH can be based on frequency domain, which means, the repetition of PDCCH can be across one or more CORESET or SS, the time resources for PDCCH repetition is same between all of the PDCCH repetitions, and the frequency resources for PDCCH repetition is different between different PDCCH repetition, Take CORESET size with 2 symbols and 4 repetition of PDCCH repetition as an example, as show in FIG. 7.
  • the repetition pattern of PDCCH can be based on time and frequency domain, which means, the repetition of PDCCH can be across one or more CORESET or SS, the time resources for a set of PDCCH repetitions is same, and the frequency resources for a set of PDCCH repetitions is different between different PDCCH repetition. If a set of PDCCH repetitions have same time domain resources, then the frequency domain resources of the PDCCH repetitions within the set of PDCCH repetitions are different, if a set of PDCCH repetition have same frequency domain resources, then the time domain resources of the PDCCH repetitions within the set of PDCCH repetitions are different. Mapping rule of PDCCH repetition can be frequency domain first, then time domain. Take CORESET size with 2 symbols and 4 repetition of PDCCH repetition as an example, as show in FIG. 8.
  • the repetition pattern of PDCCH can be based on time and frequency domain, which means, the repetition of PDCCH can be across one or more CORESET or SS, the time resources for a set of PDCCH repetitions is same, and the frequency resources for a set of PDCCH repetitions is different between different PDCCH repetition. If a set of PDCCH repetitions have same time domain resources, then the frequency domain resources of the PDCCH repetitions within the set of PDCCH repetitions are different, if a set of PDCCH repetition have same frequency domain resources, then the time domain resources of the PDCCH repetitions within the set of PDCCH repetitions are different. Mapping rule of PDCCH repetition can be time domain first, then frequency domain. Take CORESET size with 2 symbols and 4 repetition of PDCCH repetition as an example, as show in FIG. 9.
  • the present invention further discloses a downlink coverage enhancement method, executed by a base station.
  • the method comprises: operation S1002: configuring an enlarged control channel element (CCE) aggregation level (AL) for a physical downlink control channel (PDCCH) , as shown in FIG. 10.
  • CCE enlarged control channel element
  • A aggregation level
  • PDCCH physical downlink control channel
  • the CCE AL includes one of 32 CCE AL or 64 CCE AL.
  • an actual symbols number of the PDCCH in a time domain is calculated by multiplying a CORESET size of the CORESET and a CORESET size scale factor.
  • the CORESET size scale factor is one of an integer or a positive number, the CORESET size means time domain size of the CORESET. In one aspect, the scale factor is indicated by base station.
  • the scale factor is indicated within a resource allocation table of the CORESET, a column of the table is used to indicate the scale factor.
  • the configuring the enlarged CCE AL comprises configuring an enlarged CORESET size.
  • the CORESER size may be greater than 3, the CORESET size means time domain size of the CORESET
  • a plurality of indexes of a resource allocation table of the CORESET is used to configure the enlarged CORESET size in a time domain
  • the CORESET size in a time domain means time domain size of the CORESET
  • a specific table including at least one of a) synchronization signal (SS) /physical broadcast channel (PBCH) block and a CORESET multiplexing pattern, b) a number of resource blocks (RB) , c) a number of symbols, and d) an offset of the resource blocks is used to configure the enlarged CORESET size in a time domain.
  • the method further comprises transmitting an indication of the specific table.
  • the downlink coverage enhancement method further comprises indicating a DMRS-bundling to bundle a plurality of DMRS symbols of the PDCCH as an entity.
  • the present invention further discloses a downlink coverage enhancement method, executed by a user equipment.
  • the method comprises: operation S1102, receiving an enlarged control channel element (CCE) aggregation level (AL) for a physical downlink control channel (PDCCH) , as shown in FIG. 11.
  • CCE control channel element
  • A enlarged control channel element
  • PDCCH physical downlink control channel
  • the CCE AL includes one of 32 CCE AL or 64 CCE AL.
  • an actual symbols number of the PDCCH in a time domain is calculated by multiplying a CORESET size of the CORESET and a CORESET size scale factor.
  • the CORESET size scale factor is one of an integer or a positive number.
  • the scale factor is indicated within a resource allocation table of the CORESET, a column of the table is used to indicate the scale factor.
  • the configuring the enlarged CCE AL comprises configuring an enlarged CORESET size.
  • a plurality of indexes of a resource allocation table of the CORESET is used to configure the enlarged CORESET size in a time domain.
  • a specific table including at least one of a) synchronization signal (SS) /physical broadcast channel (PBCH) block and a CORESET multiplexing pattern, b) a number of resource blocks (RB) , c) a number of symbols, and d) an offset of the resource blocks is used to configure the enlarged CORESET size in a time domain, wherein the method further comprises: receiving an indication of the specific table from the base station.
  • the downlink coverage enhancement method further comprises receiving a DMRS-bundling indication to bundle a plurality of DMRS symbols of the PDCCH as an entity; and performing a channel estimation based on the entity.
  • large CCE aggregation level (AL) for PDCCH can be considered, e.g. 32 and/or 64 AL level CCE of PDCCH can be used, then the CCE aggregation level and corresponding number of candidates can be shown in table 1. In this way, low code rate of PDCCH can be achieved, and thus, coverage capacity can be improved.
  • Table 1 shows CCE aggregation levels and maximum number of PDCCH candidates per CCE aggregation level for CSS sets configured by searchSpaceSIB1.
  • the scale factor can be an integer or a positive number (denote as k)
  • the actual symbol number of CORESET/the PDCCH in time domain for type 0/typeA/type0B/type1/type1a/type2/type3 search space/common search space is equal to: CORESET size *k.
  • the CORESET size is based on time domain and/or the CORESET size is indicated by gNB via MIB or SIB1 or RRC or MAC-CE or DCI or SIBx.
  • SIBx is a type of system information.
  • type 0/typeA/type0B/type1/type1a/type2/type3 search space/common search space which are defined in TS 38.213.
  • the term “based on time domain” in the first example refers to describe the CORESET size in time domain, which means the CORESET size may also represented time domain size.
  • a column within a table can be used to extend the CORESET size (denote as extending value) , where the table can be “Set of resource blocks and slot symbols of CORESET for Type0-PDCCH search space set” , which is defined in TS 38.213 section 13.
  • the Reserved state of the “Set of resource blocks and slot symbols of CORESET for Type0-PDCCH search space set” table can be used to indicate a large CORESET size in time domain which can be used to carry large CCE aggregation level for PDCCH, the CORESET size in time domain can be configured large than 3, e.g. 4 or 6 or 12 or 8.
  • PDCCH ⁇ SCS is ⁇ 15, 15 ⁇ kHz for frequency bands with minimum channel bandwidth 3 MHz and channel bandwidth 3 MHz or 5 MHz as an example, at least one of the reserved state (index 12 ⁇ 15) can be used to configured a large time domain CORESET size, as show in table 3.
  • the index of table 3 when the index of table 3 is indicated as 12, then SS/PBCH block and CORESET multiplexing pattern is 1, the frequency resources of CORESET is 24, and the size of CORESET/PDCCH in time domain is 6, then the total CCE number is equal to: 144, and CCE AL equal to 16 can be supported.
  • the index of table 3 is indicated as 15, and the size of CORESET/PDCCH in time domain is 12, then the total CCE number is equal to: 288, and CCE AL equal to 32 can be supported. In this way, large CCE AL can be support and the coverage capacity of PDCCH can be improved.
  • new table for “Set of resource blocks and slot symbols of CORESET for Type0-PDCCH search space set” can be used, where, each low of the table include at least one of the following parameters: SS/PBCH block and CORESET multiplexing pattern; Number of RBs Number of Symbols or Offset (RBs) .
  • the Number of Symbols can be large than 3, e.g. 4 or 6 or 8 or 12, when the new table is introduced, then 1 bit can be used to indicate which table is used. For instance, “0” indicates the legacy table, “1” indicates the new table. Alternatively, “1” indicates the legacy table, “0” indicates the new table.
  • the 1 bit can be carry by gNB via MIB or SIB1 or RRC or MAC-CE or DCI or SIBx, where SIBx is a system information.
  • the type of table can be indicated by Radio Network Temporary Identity (RNTI)
  • RNTI Radio Network Temporary Identity
  • the RNTI can be C-RNTI or RA-RNTI or CS-RNTI or SI-RNTI or TC-RNTI.
  • the present invention further discloses a downlink coverage enhancement method, executed by a base station.
  • the method comprises: operation S1202, configuring a sparsified Demodulation Reference Signal (DMRS) pattern, as shown in FIG. 12.
  • DMRS Demodulation Reference Signal
  • the sparsified DMRS pattern is enabled in responsive of at least one of: transmission repetition of a PDCCH being enabled; transmission of a PDCCH across multiple search space or CORESET is enabled; aggregation Level (AL) of a PDCCH being larger than a first threshold; symbols occupied by a PDCCH being larger than a second threshold.
  • the first threshold can be equal to 16, the second threshold can be 3.
  • the DMRS pattern occupies a plurality of resource elements spaced apart in a frequency domain.
  • the DMRS pattern comprises a plurality of DMRS spaced apart in a time domain.
  • a bitmap is used to indicate the DMRS pattern in the time domain.
  • a size of the bitmap is equal to a number of the CORESETs which comprise the plurality of DMRS in the time domain.
  • the downlink coverage enhancement method further comprises receiving, from a user equipment, an indication reporting a capability of the UE supporting the DMRS-bundling.
  • DMRS can be enhanced, the mainly method to enhance DMRS is to optimize DMRS pattern based on PDCCH repetition and /or large aggregation level CCE of PDCCH, DMRS-less for PDCCH can be considered, more sparse DMRS pattern in frequency domain or a set of symbols within the time resources of the PDCCH without DMRS can be enabled, in this way, the code rate of PDCCH can be further decrease, then the coverage capacity can be improved.
  • more sparse DMRS pattern in time domain or a set of symbols within the frequency resources of the PDCCH without DMRS can be enabled, in this way, the code rate of PDCCH can be further decrease, then the coverage capacity can be improved.
  • the quantity l is the OFDM symbol number within the slot.
  • the antenna port p 2000.
  • the DMRS occupy sub-carrier of ⁇ 1, 7 ⁇ per RB, as show in FIG. 13.
  • the more sparse DMRS pattern in frequency domain is used for PDCCH when at least one of the following case is configured: PDCCH with repetition; PDCCH can be across multiple search space or CORESET; Aggregation level of PDCCH over than a threshold, the threshold is an integer (e.g. 16) .
  • the occupied symbols of the PDCCH over than a threshold e.g. more than 2 or 3.
  • new time domain DMRS pattern can be used for the PDCCH
  • a set of symbols of PDCCH can be without DMRS, in other words, a sparse DMRS pattern in time domain for PDCCH is used, not all symbols of PDCCH need to include DMRS, the set of symbols of PDCCH with no DMRS can be configured by gNB or pre-defined.
  • a DMRS pattern in time domain can be configured or pre-defined, a set of symbols of PDCCH with no DMRS, the pattern can be indicated via bitmap or pre-defined rules, take indicate via bitmap as an example, the size of bitmap is equal to the size of CORESET in time domain, and each CORESET of the PDCCH except the first CORESET using the same DMRS pattern, e.g., the CORESET size is equal to 3, then the bitmap is also 3 bits and the bitmap indicate as “010” , then means, the first and third symbols within a CORESET without DMRS, the second symbol within a CORESET with DMRS, as show in FIG. 14. Or the bitmap indicate as “010” , then means, the first and third symbols within a CORESET with DMRS, the second symbol within a CORESET without DMRS.
  • the size of bitmap is equal to the total number of symbols of PDCCH except the symbols for the first PDCCH repetition.
  • a sparse DMRS pattern in time domain for PDCCH is used for the remaining PDCCH repetition except the first repetition of PDCCH, which means, all of the symbol of the first PDCCH repetition include DMRS and/or a sparse DMRS pattern in time domain is used for the remaining repetition of PDCCH except the first one.
  • pre-defined pattern of DMRS for PDCCH in time domain a sparse DMRS pattern in time domain for PDCCH can be used.
  • a sparse DMRS pattern in time domain for PDCCH is used for all of PDCCH repetition which include the first repetition of PDCCH, which means, all of the PDCCH repetition have the same sparse DMRS pattern in time domain, the sparse DMRS pattern in time domain can be indicated via bitmap or pre-defined.
  • new time and frequency domain pattern can be used, in frequency, more sparse DMRS pattern in frequency domain and a sparse DMRS pattern in time domain for PDCCH can be used.
  • the quantity l is the OFDM symbol number within the slot.
  • the antenna port p 2000.
  • new time and frequency domain pattern can be used, in frequency domain, more density DMRS pattern in frequency domain and in time domain, a sparse DMRS pattern in time domain for PDCCH can be used.
  • the quantity l is the OFDM symbol number within the slot.
  • the antenna port p 2000.
  • DMRS-bundling to joint channel estimation can be considered, which means it can bundle all the DMRS symbols of PDCCH as an entity, then channel estimation based on the entity of the DMRS bundle, the DMRS-bundling can be indicated by gNB via SIB1 or MIB or SIBx or RRC or MAC-CE or DCI.
  • the capability of a UE to support DMRS-bundling can be indicated by Msg1 or MsgB or Msg3 or Msg5.
  • the size of CORESET in time domain can be 6, 12 symbols.
  • the CCE-to-REG mapping for a control-resource set can be interleaved or non-interleaved and is described by REG bundles:
  • REG bundle i is defined as REGs ⁇ iL, iL+1, ..., iL+L-1 ⁇ where L is the REG bundle size, and is the number of REGs in the CORESET; or
  • CCE j consists of REG bundles ⁇ f (6j/L) , f (6j/L+1) , ..., f (6j/L+6/L-1) ⁇ where f ( ⁇ ) is an interleaver
  • the UE is not expected to handle configurations resulting in the quantity C not being an integer.
  • ControlResourceSet IE For a CORESET configured by the ControlResourceSet IE:
  • ⁇ is given by the higher-layer parameter frequencyDomainResources
  • ⁇ is given by the higher-layer parameter duration, where is supported only if the higher-layer parameter dmrs-TypeA-Position equals 3;
  • ⁇ L 6 for non-interleaved mapping and is given by the higher-layer parameter reg-BundleSize for interleaved mapping;
  • ⁇ R is given by the higher-layer parameter interleaverSize
  • the REG-to-reg-Bundle mapping can be time domain first, then frequency domain.
  • This disclosure proposes method (s) to improve the coverage capacity of PDSCH, PDSCH with available slots counter can be considered, with this way, the repetition number of PDSCH can be guarantee, thus, corresponding, the coverage capacity for PDSCH can be improved.
  • available slots counter for PDSCH is enabled, then how to handle of RV cycling and available slots can also need to defined.
  • a slot is not counted in the number of N slots for PDSCH transmission of a PDSCH repetition scheduled by DCI format 1_1 or 1_2 or 1_3 or 1_0 if at least one of the symbols indicated by the indexed row of the used resource allocation table in the slot overlaps with a UL symbol indicated by tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated if provided, or a symbol of an RO (RACH occasion) and/or Msg A and/or Msg1, where the RO/MsgA/Msg1 can be indicated by gNB via ROMask and/or SIB1 or RACH-ConfigCommon or RACH-ConfigDedicated or RACH-ConfigGeneric or RACH-ConfigCommonTwoStepRA or RACH-ConfigGenericTwoStepRA.
  • the RACH-ConfigCommon or RACH-ConfigDedicated or RACH-ConfigGeneric or RACH-ConfigCommonTwoStepRA or RACH-ConfigGenericTwoStepRA is/are defined in TS 38.331.
  • a slot is not counted in the number of N*K slots for PDSCH transmission of a PDSCH repetition scheduled by DCI format 1_1 or 1_2 or 1_3 or 1_0 if at least one of the symbols indicated by the indexed row of the used resource allocation table in the slot overlaps with a UL symbol indicated by tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated if provided, or symbol of an RO (RACH occasion) and/or Msg A and/or Msg1, where the RO/MsgA/Msg1 can be indicated by gNB via ROMask and/or SIB1 or RACH-ConfigCommon or RACH-ConfigDedicated or RACH-ConfigGeneric or RACH-ConfigCommonTwoStepRA or RACH-ConfigGenericTwoStepRA.
  • the RACH-ConfigCommon or RACH-ConfigDedicated or RACH- ConfigGeneric or RACH-ConfigCommonTwoStepRA or RACH-ConfigGenericTwoStepRA is/are defined in TS 38.331.
  • a signaling to enable supplement repetition (s) after the end of the configured PDSCH repetition can be RRC or MAC-CE or DCI, the parameters (e.g., Time Domain Resource Allocation (TDRA) , Frequency Domain Resource Allocation (FDRA) , Modulation and Coding Scheme (MCS) , etc. ) configuration of the supplement repetition of PDSCH are shared the same parameters of the first PDSCH repetition.
  • TDRA Time Domain Resource Allocation
  • FDRA Frequency Domain Resource Allocation
  • MCS Modulation and Coding Scheme
  • RV Redundancy Version
  • the present invention discloses a downlink coverage enhancement method, executed by a base station.
  • the method comprises: operation 1502, configuring a plurality of repetition transmissions of a physical downlink share channel (PDSCH) , or configuring a transport block (TB) of a transmission of the PDSCH over a plurality of slots, or configuring the PDSCH with DMRS-bundling.
  • PDSCH physical downlink share channel
  • TB transport block
  • the downlink coverage enhancement method further comprises transmitting the repetition transmissions of the PDSCH on the available slots; and wherein a plurality of symbols of the available slots do not overlap with an uplink symbol indicated by tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated or a symbols of random access channel (RACH) occasion (s) .
  • RACH random access channel
  • the configuring the TB of the PDSCH to cross a plurality of slots comprises: indicating a number of slots for the TB via PDSCH-TimeDomainResourceAllocationList by the BS or;indicating a number of slot for the TB via repetitionNumber-r16 by the BS; or a number of slots for the TB is equal to a number of repetition transmissions of the PDSCH.
  • the PDSCH is a contention resolution message (Mg4) .
  • the configuring the repetition transmissions of the Msg 4 comprises indicating the repetition transmissions of the Msg4 by a downlink assignment index.
  • a number of repetition transmission of the Msg4 is equal to a number of a repetition transmission of a physical uplink control channel (PUCCH) plus an offset value.
  • PUCCH physical uplink control channel
  • the configuring the repetition transmissions of the Msg 4 comprises transmitting candidate repetition numbers of the Msg4; wherein 2 most significant bit (MSB) and/or 2 least significant bit (LSB) of modulation and coding scheme (MCS) are used to determine the number of the repetition transmissions of Msg4 from the candidate repetition numbers.
  • MSB most significant bit
  • LSB least significant bit
  • MCS modulation and coding scheme
  • the configuring the repetition transmissions of the Msg 4 comprises indicating a repetition number of the repetition transmissions of the Msg4 via a DMRS sequence; or indicating a repetition number of the repetition transmissions of the Msg4 via Time Domain Resource allocation (TDRA) of the PDSCH.
  • TDRA Time Domain Resource allocation
  • an original monitoring time between the Msg4 and a previous Msg 3 is predefined, and wherein a portion of the repetition transmissions of the Msg4 which exceeds the original monitoring time is dropped; or wherein an actual monitoring time for the Msg4 is determined based on the original monitoring time and time occupation of the repetition transmissions of the Msg4.
  • the configuring the Msg4 over a plurality of slots comprises indicating a slots number for the Msg4 via a downlink assignment index.
  • the configuring the Msg4 over a plurality of slots comprises transmitting candidate slot numbers of the Msg4; wherein 2 most significant bit (MSB) bits and/or 2 least significant bit (LSB) bits of modulation and coding scheme (MCS) within the DCI being scrambled by TC-RNTI are used to determine the slot number from the candidate slot numbers.
  • MSB most significant bit
  • LSB least significant bit
  • MCS modulation and coding scheme
  • the configuring the Msg4 over a plurality of slots comprises indicating a slot number for the Msg4 via a DMRS sequence of a corresponding PDCCH which is configured to schedule the Msg4.
  • the configuring the Msg4 over a plurality of slots comprises indicating a slot number for the Msg4 via a TDRA of the PDSCH.
  • the present invention discloses a downlink coverage enhancement method, executed by a user equipment (UE) .
  • the method comprises: operation S1602, receiving a plurality of repetition transmissions of a physical downlink share channel (PDSCH) ; or receiving a transport block (TB) of a transmission of the PDSCH over a plurality of slots; or receiving a DMRS-bundling indication of the PDSCH.
  • PDSCH physical downlink share channel
  • TB transport block
  • the downlink coverage enhancement method further comprises receiving the repetition transmissions of the PDSCH on the available slots; and wherein a plurality of symbols of the available slots do not overlap with an uplink symbol indicated by tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated or a symbols of random access channel (RACH) occasion (s) .
  • RACH random access channel
  • the PDSCH is a contention resolution message (Msg4) .
  • the receiving the repetition transmissions of the Msg4 comprises receiving the repetition transmissions of the Msg4 by a downlink assignment index.
  • a number of repetition transmission of the Msg4 is equal to a number of a repetition transmission of a physical uplink control channel (PUCCH) plus an offset value.
  • PUCCH physical uplink control channel
  • the receiving the repetition transmissions of the Msg4 comprises: receiving candidate repetition numbers of the Msg4; wherein 2 most significant bit (MSB) and/or 2 least significant bit (LSB) of modulation and coding scheme (MCS) are used to determine the number of the repetition transmissions of Msg4 from the candidate repetition numbers.
  • MSB most significant bit
  • LSB least significant bit
  • MCS modulation and coding scheme
  • the receiving the repetition transmissions of the Msg4 comprises: receiving a repetition number of the repetition transmissions of the Msg4 via a DMRS sequence; or receiving a repetition number of the repetition transmissions of the Msg4 via Time Domain Resource allocation (TDRA) of the PDSCH.
  • TDRA Time Domain Resource allocation
  • RV cycling is based on the actual transmission of PDSCH repetitions, where the actual transmission of PDSCH repetitions are determined based on the configured PDSCH repetition and supplement PDSCH repetitions, which means connected the configured PDSCH repetition and supplement PDSCH repetitions as an entity, then RV cycling is based on the entity. For instance, as shown in FIG.
  • the PDSCH repetitions number is 4 and it’s based on available slots counter
  • RV sequence is configured as ⁇ 0, 2, 3, 1 ⁇ , due to slot 3 and slot 6 with collision, there two PDSCH repetition need to drop and two supplement PDSCH repetitions (carried by slot 7 and slot 8) is added, then connective configured 4 PDSCH repetitions and two supplement PDSCH repetitions as an entity, then the RV sequence is cycled within the entity, then the final RV for the PDSCH repetitions are ⁇ 0, 2, 0, 2 ⁇ .
  • RV cycling is based on the configured PDSCH repetitions, the RV for the supplement PDSCH repetition is same as the collision PDSCH transmission.
  • the PDSCH repetitions number is 4 and it’s based on available slots counter
  • RV sequence is configured as ⁇ 0, 2, 3, 1 ⁇ , due to slot 3 and slot 6 with collision, there two PDSCH repetition need to drop and two supplement PDSCH repetitions (carried by slot 7 and slot 8) is added, two supplement PDSCH repetitions with same RV as collided PDSCH repetitions, , then the final RV for the PDSCH repetitions are ⁇ 0, 2, 3, 1 ⁇ .
  • a third embodiment propose method (s) to improve the coverage capacity of PDSCH, PDSCH across multiple slots can be considered, which means, a TB of PDSCH can be across multiple slots and thus, the header overhead can be reduced due to only one TB is used, with this way, the code rate of the PDSCH is decreased, and thus, the coverage capacity for PDSCH can be improved, the following methods can be used to enable a TB to across multiple slots.
  • the number slot for a PDSCH TB processing can be indicated by gNB via PDSCH-TimeDomainResourceAllocationList, an IE (Information element) is added into PDSCH-TimeDomainResourceAllocationList and used to indicate the number slots for a PDSCH TB processing.
  • Table 3 shows an example of the IE.
  • the number slots for a PDSCH TB processing can be indicated by gNB via repetitionNumber-r16, where repetitionNumber-r16 is defined in PDSCH-TimeDomainResourceAllocationList in TS 38.331, an IE is added into PDSCH-Config to enable PDSCH transmission based on a TB processing multiple slots or PDSCH transmission based on a TB with repeat, which means, when PDSCHTBoMS is configured as enabled or dataTransmissionType configured as “TBoMS” , then PDSCH transmission is triggered as TB processing over multiple slots, the repetitionNumber-r16 is used to indicate the number of slots, when PDSCHTBoMS is absent or dataTransmissionType configured as “repeat” , then PDSCH transmission is triggered as repetition, the repetition number is indicated by repetitionNumber-r16.
  • Table 4 shows an example of the information element.
  • the number slot for a PDSCH TB processing can be indicated by gNB via repetitionNumber-r16, where repetitionNumber-r16 is defined in PDSCH-TimeDomainResourceAllocationList in TS 38.331, an IE is added into PDSCH-TimeDomainResourceAllocationList to enable PDSCH transmission based on a TB processing multiple slots or PDSCH transmission based on a TB with repeat.
  • the number of slots for a PDSCH TB processing can be indicated by gNB via repetitionNumber-r16, where repetitionNumber-r16 is defined in PDSCH-TimeDomainResourceAllocationList in TS 38.331, an IE is added into each row of PDSCH-TimeDomainResourceAllocationList to enable PDSCH transmission based on a TB processing multiple slots or PDSCH transmission based on a TB with repeat.
  • repetitionNumber-r16 is defined in PDSCH-TimeDomainResourceAllocationList in TS 38.331
  • an IE is added into each row of PDSCH-TimeDomainResourceAllocationList to enable PDSCH transmission based on a TB processing multiple slots or PDSCH transmission based on a TB with repeat.
  • the current TBS determination way for a PDSCH is suitable anymore, it will caused misalignment REs at gNB and UE side.
  • the following method can be used.
  • the UE shall first determine the number of REs (NRE) within multiple slots/time units which used for a PDSCH transmission, where time units is based on granularity of time resource allocation of PDSCH.
  • NRE REs
  • a UE first determines the number of REs allocated for PDSCH within a PRB (N′ RE ) by where is the number of subcarriers in a physical resource block, is the number of symbols of the PDSCH allocation within the multiple slots/time units for a PDSCH transmission, is the number of REs for DM-RS per PRB in the scheduled duration including the overhead of the DM-RS CDM groups without data, as indicated by DCI format 1_1, 1_2 or 1_3 or as described for format 1_0 in Clause 5.1.6.2, and is the overhead configured by higher layer parameter xOverhead in PDSCH-ServingCellConfig.
  • the xOverhead in PDSCH-ServingCellconfig is not configured (a value from 6, 12, or 18) , the is set to 0. If the PDSCH is scheduled by PDCCH with a CRC scrambled by SI-RNTI, RA-RNTI, MSGB-RNTI or P-RNTI, is assumed to be 0. If the PDSCH is scheduled by PDCCH with a CRC scrambled by G-RNTI for multicast or G-CS-RNTI or PDSCH without PDCCH is activated by PDCCH with a CRC scrambled by G-CS-RNTI, is the overhead configured by higher layer parameter xOverhead-Multicast in pdsch-ConfigMulticast.
  • the xOverhead-Multicast in pdsch-ConfigMulticast is not configured, the is set to 0. If the PDSCH is scheduled by PDCCH with a CRC scrambled by G-RNTI for broadcast or MCCH-RNTI, is the overhead configured by higher layer parameter xOverhead in pdsch-ConfigBroadcast. If the xOverhead in pdsch-ConfigBroadcast is not configured, the is set to 0.
  • N RE min (156*N, N′ RE )
  • nPRB is the total number of allocated PRBs for the UE.
  • Ninfo Unquantized intermediate variable
  • a fourth embodiment is related to coverage enhacement for PDSCH with DMRS bundling.
  • This disclosure propose method (s) to improve the coverage capacity of PDSCH based on DMRS-bundling, DMRS-bundling means for a PDSCH TB transmission, bundle a set of DMRS symbols as an entity, then estimation channel state based on the entity of DMRS symbols, with this way, then accurate channel state can be achieved, thus, coverage capacity can be improved.
  • a PDSCH TB can be across multiple slots, due to long time duration of a TB, bundle the DMRS symbols as an entity, then the channel estimation accurate can be improved, an IE added into PDSCH-Config to enable joint coding channel estimation (DMRS-bundling) can be used.
  • Tables 5 to 7 show examples of these information elements respectively.
  • the interleaving of PDSCH need to perform based on a PDSCH group, which means, within a PDSCH group, interleaving is disabled and interleaving is enabled between different PDSCH group.
  • DMRS-bundling joint coding channel estimation
  • the UE determines one or multiple nominal TDWs, as follows:
  • maxDurationDMRS-Bundling is maximum duration for a nominal TDW subject to UE capability [13, TS 38.306]
  • M is the time duration in consecutive slots of N ⁇ K PUSCH transmissions
  • a) . for PDSCH transmissions of PUSCH repetition Type A, N 1 and K is the number of repetitions
  • b) . for PDSCH transmissions of TB processing over multiple slots N is the number of slots used for TBS determination and K is the number of repetitions of the number of slots N used for TBS determination.
  • the start of the first nominal TDW is the first slot determined for the first PDSCH transmission
  • the end of the last nominal TDW is the last slot determined for the last PDSCH transmission
  • the start of any other nominal TDWs is the first slot determined for PDSCH transmission after the last slot determined for PDSCH transmission of a previous nominal TDW.
  • the start of the first nominal TDW is the first slot for the first PUSCH transmission
  • the end of the last nominal TDW is the last slot for the last PUSCH transmission
  • the start of any other nominal TDWs is the first slot after the last slot of a previous nominal TDW.
  • a nominal TDW consists of one or multiple actual TDWs.
  • the UE determines the actual TDWs as follows:
  • the start of the first actual TDW is the first symbol of the first PDSCH transmission in a slot for PDSCH transmission with repetition type A scheduled by DCI format 0_1 or 0_2, or PUSCH repetition Type A with a configured grant, or PUSCH repetition type B or TB processing over multiple slots within the nominal TDW.
  • the end of an actual TDW is: a) . the last symbol of the last PUSCH transmission in a slot for PUSCH transmission of PUSCH repetition type A scheduled by DCI format 0_1 or 0_2, or PUSCH repetition Type A with a configured grant, or PUSCH repetition type B or TB processing over multiple slots within the nominal TDW, if the actual TDW reaches the end of the last PUSCH transmission within the nominal TDW; or b) .
  • the PUSCH transmission is in a slot for PUSCH transmission of PUSCH repetition type A scheduled by DCI format 0_1 or 0_2, or PUSCH repetition Type A with a configured grant, or PUSCH repetition type B or TB processing over multiple slots.
  • the start of a new actual TDW is the first symbol of the PDSCH transmission after the event which causes power consistency and phase continuity not to be maintained across PDSCH transmissions of PUSCH repetition type A scheduled by DCI format 0_1 or 0_2, or PDSCH repetition Type A with a configured grant, or PDSCH repetition type B or TB processing over multiple slots within the nominal TDW, and the PUSCH transmission is in a slot for PDSCH transmission of PDSCH repetition type A scheduled by DCI format 0_1 or 0_2, or PDSCH repetition Type A with a configured grant, or PDSCH repetition type B or TB processing over multiple slots.
  • a fifth embodiment is related to coverage enhancement for Msg4 PDSCH.
  • This disclosure propose method (s) to improve the coverage capacity for Msg4 PDSCH, Msg4 PDSCH with repetitions, Msg4 PDSCH across multiple slots, Msg4 PDSCH with DMRS-bundling for channel estimation, with this way, the coverage capacity of Msg4 PDSCH can be improved.
  • the Msg4 PDSCH is scheduled by a DCI scrambled with TC-RNTI and Downlink assignment index (DAI) within the DCI which is used to indicate the number of repetitions for PUCCH, where the PUCCH which is used for HARQ-ACK feedback of Msg4 PDSCH.
  • DCI Downlink assignment index
  • 2 bits downlink assignment index can be used to indicate repetitions number of Msg4 PDSCH.
  • the repetitions number of Msg4 PDSCH is equal to the repetitions number of PUCCH, where the PUCCH is used to carry HARQ-ACK of Msg4 PDSCH.
  • an offset value (denote as N) between repetition number of Msg4 PDSCH and repetition number of the PUCCH can be configured by base station via SIB1, SIBx, RRC, MAC-CE or DCI, the offset value can be an integer, then the repetition number of Msg4 PDSCH equal to: repetition number of the PUCCH +N.
  • 2 bits downlink assignment index can be used to indicate repetitions number of Msg4 PDSCH
  • a set of candidate repetitions number of Msg4 PDSCH can be configured by base station via SIB1 or SIBx or RRC
  • the candidate repetition number of Msg4 PDSCH can be ⁇ 1, 2, 4, 8 ⁇ or ⁇ 2, 4, 8, 16 ⁇ or ⁇ 2, 4, 6, 8 ⁇ or ⁇ 2, 4, 8, 12 ⁇
  • 2 bit can be used to indicate one value within the candidate values, take the candidate repetition number of Msg4 PDSCH as ⁇ 2, 4, 8, 16 ⁇ as an example, when the DAI field indicate as “00” , then means, the repetition number of Msg4 PDSCH is equal to 2, when the DAI field indicate as “01” , then means, the repetition number
  • the 2 MSB or 2 LSB bits of MCS within a DCI which is scrambled by TC-RNTI can be used to indicate the repetitions number of Msg4 PDSCH
  • a set of candidate repetitions number of Msg4 PDSCH can be configured by base station via SIB1 or SIBx or RRC
  • the candidate repetition number of Msg4 PDSCH can be ⁇ 1, 2, 4, 8 ⁇ or ⁇ 2, 4, 8, 16 ⁇ or ⁇ 2, 4, 6, 8 ⁇ or ⁇ 2, 4, 8, 12 ⁇
  • 2 bit can be used to indicate one value within the candidate values.
  • repetitions number of Msg4 PDSCH can be indicated via DMRS sequence of PDCCH, where, the PDCCH is used to schedule Msg4 PDSCH, ⁇ 2, 4, 8 ⁇ DMRS sequences of PDCCH can be used, then each DMRS sequence related to one candidate number repetitions of Msg4 PDSCH, which means, each DMRS sequence can be used to indicate one repetition number of Msg4 PDSCH.
  • repetition number of Msg4 PDSCH can be indicated via TDRA OF PDSCH, a column can be added into the TDRA table, which is used to indicate the repetition number of Msg4 PDSCH.
  • 2 bits downlink assignment index can be used to indicate slots number, where the number of slots are used for Msg4 PDSCH processing (can also be denote as: Msg4 PDSCH processing across multiple slots) .
  • the slots number of Msg4 PDSCH is equal to the repetitions number of PUCCH, where the PUCCH is used to carry HARQ-ACK of Msg4 PDSCH.
  • an offset value (denote as N) between the number slots of Msg4 PDSCH (which is used for Msg4 PDSCH processing) and repetition number of the PUCCH can be configured by base station via SIB1, SIBx, RRC, MAC-CE or DCI, the offset value can be an integer, then the number of slots of Msg4 PDSCH equal to: repetition number of the PUCCH +N.
  • 2 bits downlink assignment index can be used to indicate the number of slots of Msg4 PDSCH
  • a set of candidate number of slots of Msg4 PDSCH can be configured by base station via SIB1 or SIBx or RRC
  • the candidate number of slots of Msg4 PDSCH can be ⁇ 1, 2, 4, 8 ⁇ or ⁇ 2, 4, 8, 16 ⁇ or ⁇ 2, 4, 6, 8 ⁇ or ⁇ 2, 4, 8, 12 ⁇
  • 2 bit can be used to indicate one value within the candidate values, take the candidate slots number of Msg4 PDSCH as ⁇ 2, 4, 8, 16 ⁇ as an example, when the DAI field indicate as “00” , then means, the number of slots of Msg4 PDSCH is equal to 2, when the DAI field indicate as “01” , then means,
  • the 2 MSB or 2 LSB bits of MCS within a DCI which is scrambled by TC-RNTI can be used to indicate the number of slots for Msg4 PDSCH processing
  • a set of candidate number of slots of Msg4 PDSCH can be configured by base station via SIB1 or SIBx or RRC
  • the candidate number of slots of Msg4 PDSCH can be ⁇ 1, 2, 4, 8 ⁇ or ⁇ 2, 4, 8, 16 ⁇ or ⁇ 2, 4, 6, 8 ⁇ or ⁇ 2, 4, 8, 12 ⁇
  • 2 bit can be used to indicate one value within the candidate values.
  • number of slots for Msg4 PDSCH processing can be indicated via DMRS sequence of PDCCH, where, the PDCCH is used to schedule Msg4 PDSCH, ⁇ 2, 4, 8 ⁇ DMRS sequences of PDCCH can be used, then each DMRS sequence related to one candidate slots number of Msg4 PDSCH, which means, each DMRS sequence can be used to indicate one slots number of Msg4 PDSCH, where the slots
  • number of slots for Msg4 PDSCH processing can be indicated via TDRA OF PDSCH, a column can be added into the TDRA table, which is used to indicate the number of slots for Msg4 PDSCH.
  • Msg4 PDSCH repetition is based on available slots, which means, a set of available slots can be used for Msg4 PDSCH repetition and/or Msg4 PDSCH processing.
  • a slot is not counted in the number of N slots for Msg4 PDSCH transmission of a PDSCH repetition scheduled by DCI if at least one of the symbols indicated by the indexed row of the used resource allocation table in the slot overlaps with a UL symbol indicated by tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated if provided, or a symbol of an RO (RACH occasion) and/or Msg A and/or Msg1, where the RO/MsgA/Msg1 can be indicated by gNB via ROMask and/or SIB1 or RACH-ConfigCommon or RACH-ConfigDedicated or RACH-ConfigGeneric or RACH-ConfigCommonTwoStepRA or RACH-ConfigGen
  • the RACH-ConfigCommon or RACH-ConfigDedicated or RACH-ConfigGeneric or RACH-ConfigCommonTwoStepRA or RACH-ConfigGenericTwoStepRA is/are defined in TS 38.331.
  • Msg4 PDSCH processing across multiple slots is based on available slots, which means, a set of available slots can be used for Msg4 PDSCH processing.
  • a slot is not counted in the number of M slots for Msg4 PDSCH transmission processing scheduled by DCI if at least one of the symbols indicated by the indexed row of the used resource allocation table in the slot overlaps with a UL symbol indicated by tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated if provided, or a symbol of an RO (RACH occasion) and/or Msg A and/or Msg1, where the RO/MsgA/Msg1 can be indicated by gNB via ROMask and/or SIB1 or RACH-ConfigCommon or RACH-ConfigDedicated or RACH-ConfigGeneric or RACH-ConfigCommonTwoStepRA or RACH-ConfigGenericTwoStepRA.
  • the RACH-ConfigCommon or RACH-ConfigDedicated or RACH-ConfigGeneric or RACH-ConfigCommonTwoStepRA or RACH-ConfigGenericTwoStepRA is/are defined in TS 38.331.
  • DMRS-bundling can be used for Msg4 PDSCH with repetition and/or Msg4 PDSCH TB can be processing over multiple slots, which means, bundle the DMRS symbols of Msg4 PDSCH as an entity, then estimation channel state based on the entity, more accurate channel estimation can be achieved, thus, coverage capacity can be improved, the DMRS-bundling enabled can be via SIB1 or MIB or RRC or MAC-CE or DCI.
  • the sixth embodiment relates to time domain window during random access.
  • This disclosure propose method (s) to determinate the time relationship between Msg4 and subsequent HARQ-ACK feedback of Msg4 when Msg4 with repetitions, the first repetition of Msg4 or last repetition of Msg4 or more than one repetitions of Msg4 can be defined as a reference point, which is/are used to determinate the time relationship, with this way, the ambiguity between user device and base station can be avoid, in addition, the detection times for Msg3 at base station side can also be decreased.
  • RACH Random access channel
  • a set of time window for RACH access are defined, as show in FIG. 19, when a UE transmit a RACH preamble to gNB, then a Ra-ResponseWindow will be starting, during the RAR window, UE need to monitor a Ransom Access Response (RAR) , after UE detection RAR correctly, then transmission Msg3 based on the grant within RAR, after transmission of Msg3, UE need to receive Msg4 during a ra-contentionResolutionTimer, when UE is received the Msg4 correctly, a corresponding Hybrid Automatic Repeat request-ACKnowledgement (HARQ-ACK) of Msg4 is transmitted by user device.
  • RAR Ransom Access Response
  • HARQ-ACK Hybrid Automatic Repeat request-ACKnowledgement
  • Ra-ResponseWindow and ra-contentionResolutionTimer is ⁇ sl1, sl2, sl4, sl8, sl10, sl20, sl40, sl80 ⁇ and ⁇ sf8, sf16, sf24, sf32, sf40, sf48, sf56, sf64 ⁇ respectively, which is defined in TS 38.331.
  • Msg2 with repetitions or Msg2 PDSCH processing over multiple slots is discussed.
  • the size of ra-ResponseWindow is not extend and equal to the configuration value of ra-ResponseWindow, when Msg2 with repetitions or Msg2 PDSCH processing over multiple slots are enabled, all of resources of Msg2 PDSCH with repetitions or Msg2 PDSCH processing over multiple slots in time domain need to locate within the ResponseWindow, the portion of Msg2 PDSCH with repetitions or Msg2 PDSCH processing over multiple slots which is exceed the boundary of ResponseWindow need to drop.
  • the size of ra-ResponseWindow can be extend the configuration value of ra-ResponseWindow, and the actual ra-ResponseWindow equal to the configured value of ra-ResponseWindow plus a offset value, where the offset value equal to the portion of Msg2 with repetitions or Msg2 PDSCH processing over multiple slots which is exceed the boundary of ResponseWindow.
  • Msg4 with repetitions or Msg4 PDSCH processing over multiple slots is discussed.
  • the size of ra-contentionResolutionTimer is not extend and equal to the configuration value of ra-contentionResolutionTimer, when Msg4 PDSCH with repetitions or Msg4 PDSCH processing over multiple slots are enabled, all of resources of Msg4 PDSCH with repetitions or Msg4 PDSCH processing over multiple slots in time domain need to locate within the ra-contentionResolutionTimer, the portion of Msg4 PDSCH with repetitions or Msg4 PDSCH processing over multiple slots which is exceed the boundary of ra-contentionResolutionTimer need to drop.
  • the size of ra-contentionResolutionTimer can be extend the configuration value of ra-contentionResolutionTimer, and the actual ra-contentionResolutionTimer equal to the configured value of ra-contentionResolutionTimer plus a offset value, where the offset value equal to the portion of Msg4 PDSCH with repetitions or Msg4 PDSCH processing over multiple slots which is exceed the boundary of ra-contentionResolutionTimer.
  • a seventh embodiment is related to coverage enhancement for SIB19.
  • This disclosure proposed method (s) to improve the coverage capacity for SIB19 PDSCH, SIB19 PDSCH with repetitions, SIB19 PDSCH processing over multiple slots, SIB19 PDSCH with DMRS-bundling for channel estimation, with this way, the coverage capacity of SIB19 PDSCH can be improved.
  • SIB1 system information
  • SIB1 system information
  • SIB19 PDSCH is scheduled by a DCI scrambled with SI-RNTI, UE need to receive SIB19 to acquire information of satellite (e.g., ephemeris) timely, this information is very important for UE, due to limited transmission power and/or transmission condition (e.g. NLOS) , SIB 19 is a coverage bottleneck channel.
  • SIB19 PDSCH with repetition DMRS-bundling and/or SIB19 PDSCH TB processing over multiple slots, the following methods can be considered.
  • the present invention discloses, a downlink coverage enhancement method, executed by a base station.
  • the method comprises: operation S1702, configuring a plurality of repetition transmissions of a system information block (SIB) 19, or configuring the SIB 19 with DMRS bundling, or configuring the SIB 19 over a plurality of slots.
  • SIB system information block
  • the configuring the repetition transmissions of the SIB 19 comprises indicating a repetition number of the SIB 19 via a DMRS sequence of a corresponding physical downlink control channel (PDCCH) of the SIB 19; or indicating a repetition number of the SIB 19 PDSCH via a corresponding SIB 1 of the SIB 19, wherein an information element (IE) of the SIB 19 is configured to indicate the repetition number.
  • IE information element
  • the configuring the SIB 19 over a plurality of slots comprises indicating a number of the slots for the SIB 19 processing via a DMRS sequence of a corresponding physical downlink control channel (PDCCH) of the SIB 19; or indicating a number of slots for the SIB 19 processing via a corresponding SIB 1 of the SIB 19, wherein an information element (IE) of the SIB 19 is configured to indicate the number of slots.
  • IE information element
  • the present invention further discloses a downlink coverage enhancement method, executed by a user equipment (UE) .
  • the method comprises: operation S1802, receiving a plurality of repetition transmissions of a system information block (SIB) 19, or receiving a DMRS bundling indication of the SIB 19, or receiving the SIB 19 over a plurality of slots, as shown in FIG. 21.
  • SIB system information block
  • the receiving the repetition transmissions of the SIB 19 comprises receiving a repetition number of the SIB 19 via a DMRS sequence of a corresponding physical downlink control channel (PDCCH) of the SIB 19; or receiving a repetition number of the SIB 19 PDSCH via a corresponding SIB 1 of the SIB 19, wherein an information element (IE) of the SIB 19 is configured to indicate the repetitio n number.
  • a DMRS sequence of a corresponding physical downlink control channel (PDCCH) of the SIB 19 or receiving a repetition number of the SIB 19 PDSCH via a corresponding SIB 1 of the SIB 19, wherein an information element (IE) of the SIB 19 is configured to indicate the repetitio n number.
  • IE information element
  • the receiving the SIB 19 over a plurality of slots comprises receiving a number of the slots for the SIB 19 processing via a DMRS sequence of a corresponding physical downlink control channel (PDCCH) of the SIB 19; or receiving a number of slots for the SIB 19 processing via a corresponding SIB 1 of the SIB 19, wherein an information element (IE) of the SIB 19 is configured to indicate the number of slots.
  • a DMRS sequence of a corresponding physical downlink control channel (PDCCH) of the SIB 19 or receiving a number of slots for the SIB 19 processing via a corresponding SIB 1 of the SIB 19, wherein an information element (IE) of the SIB 19 is configured to indicate the number of slots.
  • IE information element
  • repetitions number of SIB19 PDSCH can be indicated via DMRS sequence of PDCCH, where, the PDCCH is used to schedule SIB19 PDSCH, ⁇ 2, 4, 8 ⁇ DMRS sequences of PDCCH can be used, then each DMRS sequence related to one candidate number repetitions of SIB19 PDSCH, which means, each DMRS sequence can be used to indicate one repetition number of SIB 19 PDSCH, the repetition number of SIB19 PDSCH is an integer.
  • the candidate repetition number of SIB 19 PDSCH can be ⁇ 1, 2, 4, 8 ⁇ or ⁇ 2, 4, 8, 16 ⁇ or ⁇ 2, 4, 6, 8 ⁇ or ⁇ 2, 4, 8, 12 ⁇ , and/or it’s configured by base station via SIB1.
  • repetitions number of SIB 19 PDSCH can be indicated via a field of within a DCI
  • the candidate repetition number of SIB 19 PDSCH can be ⁇ 1, 2, 4, 8 ⁇ or ⁇ 2, 4, 8, 16 ⁇ or ⁇ 2, 4, 6, 8 ⁇ or ⁇ 2, 4, 8, 12 ⁇
  • 2 bit within a DCI can be used to indicate one value within the candidate values
  • take the candidate repetition number of SIB19 PDSCH ⁇ 2, 4, 8, 16 ⁇ as an example when the field indicate as “00” , then means, the number of slots of SIB19 PDSCH is equal to 2, when the field indicate as “01” , then means, the number of slots of SIB19 PDSCH is equal to 4, when the field indicate as “10” , then means, the repetition number of SIB19 PDSCH is equal to 8, when the field indicate as “11” , then means, the repetition number of SIB 19 PDSCH is equal to 16.
  • repetitions number of SIB 19 PDSCH can be indicated via SIB1, an IE can be added into SIB19, which is used to indicate the repetition number of SIB 19 (defined in TS 38.331) , where RepNumSIB19-r19 is sued to indicate the repetition number of SIB 19 PDSCH.
  • the repetition pattern can be based on type A or type B liked repetition of PDSCH.
  • Type A like PDSCH repetition pattern can be regard as the PDSCH with repetition over multiple consecutive slots or non-consecutive slots, each slot include 1 PDSCH repetition and the time domain resources of each slot within multiple slots for PDSCH with repetition is same.
  • Type B like PDSCH repetition pattern can be regard as the PDSCH with repetition over more than one slots, each PDSCH in time domain is back-to-back mapping, a slot can include more than one repetition.
  • Table 8 shows and example of an SIB 19 information element.
  • DMRS sequence of PDCCH can be used to indicate number of slots, where the number of slots are used for SIB 19 PDSCH processing (can also be denote as: SIB19 PDSCH processing over multiple slots) , the PDCCH is used to schedule SIB 19 PDSCH.
  • SIB19 PDSCH processing can also be denote as: SIB19 PDSCH processing over multiple slots
  • the PDCCH is used to schedule SIB 19 PDSCH.
  • ⁇ 2, 4, 8 ⁇ DMRS sequences of PDCCH can be used, then each DMRS sequence related to one candidate number slots for SIB19 PDSCH processing, which means, each DMRS sequence can be used to indicate a number of slots for SIB 19 PDSCH processing, number of slots for SIB 19 PDSCH processing is an integer.
  • the number of slots for SIB 19 PDSCH processing can be ⁇ 1, 2, 4, 8 ⁇ or ⁇ 2, 4, 8, 16 ⁇ or ⁇ 2, 4, 6, 8 ⁇ or ⁇ 2, 4, 8, 12 ⁇ , and/or it’s configured by base station via SIB1.
  • a field within a DCI can be used to indicate number of slots, where the number of slots are used for SIB 19 PDSCH processing (can also be denote as: SIB19 PDSCH processing over multiple slots) , the DCI is used to schedule SIB 19 PDSCH.
  • the candidate number of slots for SIB 19 PDSCH processing can be ⁇ 1, 2, 4, 8 ⁇ or ⁇ 2, 4, 8, 16 ⁇ or ⁇ 2, 4, 6, 8 ⁇ or ⁇ 2, 4, 8, 12 ⁇
  • 2 bit within a DCI can be used to indicate one value within the candidate values, take the candidate number of slots for SIB 19 PDSCH processing as ⁇ 2, 4, 8, 16 ⁇ as an example, when the field indicate as “00” , then means, the candidate number of slots for SIB 19 PDSCH processing is equal to 2, when the field indicate as “01” , then means, the candidate number of slots for SIB 19 PDSCH processing is equal to 4, when the field indicate as “10” , then means, the candidate number of slots for SIB 19 PDSCH processing is
  • SIB1 can be used to indicate number of slots, where the number of slots are used for SIB 19 PDSCH processing (can also be denote as: SIB19 PDSCH processing over multiple slots) .
  • An IE e.g., NumSIB19TBoMS-r19
  • SIB19 defined in TS 38.331
  • NumSIB19TBoMS-r19 is used to indicate the number of slots for SIB 19 PDSCH processing.
  • SIB 19 PDSCH repetition is based on available slots, which means, a set of available slots can be used for SIB 19 PDSCH repetition and/or SIB 19 PDSCH processing.
  • a slot is not counted in the number of N slots for SIB 19 PDSCH transmission of a PDSCH repetition scheduled by DCI if at least one of the symbols indicated by the indexed row of the used resource allocation table in the slot overlaps with a UL (Uplink) symbol indicated by tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated if provided, or a symbol of an RO (RACH occasion) and/or Msg A and/or Msg1, where the RO/MsgA/Msg1 can be indicated by gNB via ROMask and/or SIB1 or RACH-ConfigCommon or RACH-ConfigDedicated or RACH-ConfigGeneric or RACH-ConfigCommonTwoStepRA or RACH-ConfigGen
  • the RACH-ConfigCommon or RACH-ConfigDedicated or RACH-ConfigGeneric or RACH-ConfigCommonTwoStepRA or RACH-ConfigGenericTwoStepRA is/are defined in TS 38.331.
  • SIB 19 PDSCH processing across multiple slots is based on available slots, which means, a set of available slots can be used for SIB 19 PDSCH processing.
  • a slot is not counted in the number of M slots for SIB 19 PDSCH transmission processing scheduled by DCI if at least one of the symbols indicated by the indexed row of the used resource allocation table in the slot overlaps with a UL symbol indicated by tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated if provided, or a symbol of an RO (RACH occasion) and/or Msg A and/or Msg1, where the RO/MsgA/Msg1 can be indicated by gNB via ROMask and/or SIB1 or RACH-ConfigCommon or RACH-ConfigDedicated or RACH-ConfigGeneric or RACH-ConfigCommonTwoStepRA or RACH-ConfigGenericTwoStepRA.
  • the RACH-ConfigCommon or RACH-ConfigDedicated or RACH-ConfigGeneric or RACH-ConfigCommonTwoStepRA or RACH-ConfigGenericTwoStepRA is/are defined in TS 38.331.
  • DMRS-bundling can be used for SIB 19 PDSCH with repetition and/or SIB 19 PDSCH TB can be processing over multiple slots, which means, bundle the DMRS symbols of SIB 19 PDSCH as an entity, then estimation channel state based on the entity, more accurate channel estimation can be achieved, thus, coverage capacity can be improved, the DMRS-bundling enabled can be via SIB1 or MIB or RRC or MAC-CE or DCI.
  • a eighth embodiment relates to coverage enhancement for PDCCH.
  • This disclosure propose method (s) to improve the coverage capacity of PDCCH for PDSCH scheduling, the PDCCH with repetition, large aggregation level CCE of the PDCCH, the PDCCH across more than one CORESET or multiple symbols.
  • DMRS-less for the PDCCH can be considered, with this way, the reduced DMRS resources can be used for PDCCH transmission, then, code rate of PDCCH can further decrease, thus, coverage capacity of PDCCH can be improved.
  • PDCCH can be enabled repetition, the repetition of PDCCH need to across multiple CORESET and/or multiple SS (Search Space) or multiple symbols, the time resources and/or frequency resources are used for PDCCH repetition can be same or different, with this way, the coverage capacity for PDCCH can be achieved.
  • the number of repetition for the PDCCH can be indicated by gNB via ControlResourceSet or SearchSpace, where ControlResourceSet or SearchSpace is defined in TS 38.331. With this way, the coverage capacity for PDCCH can be achieved.
  • the following repetition pattern of PDCCH can be used.
  • the repetition pattern of PDCCH can be based on time domain without frequency offset, which means, the repetition of PDCCH can be across multiple CORESET or SS in time domain and the frequency resources for PDCCH repetition is the same (same with the first repetition of the PDCCH) , the PDCCH repetition is consecutive or back-to-back in time domain.
  • the repetition pattern of PDCCH can be based on time domain without frequency offset, which means, the repetition of PDCCH can be across multiple CORESET or SS in time domain and the frequency resources for PDCCH repetition is the same (same with the first repetition of the PDCCH) , the PDCCH repetition is non-consecutive or non-back-to-back in time domain, the time offset between two adjacent PDCCH repetition is the same, and the time offset between 2 PDCCH repetition is configured by gNB via RRC or MAC-CE or DCI or SIB1 or ControlResourceSet or SearchSpace or the time off set is pre-defined, e.g., equal to multiple time (s) of CORESET size in time domain, with this way, time domain diversity gain can be achieved, thus, the coverage capacity of PDCCH can be improved.
  • the repetition pattern of PDCCH can be based on time domain with frequency offset, which means, the repetition of PDCCH can be across multiple CORESET or SS in time domain and the frequency resources for PDCCH repetition is different between different PDCCH repetition groups, a PDCCH repetition group include at least one PDCCH repetition, the frequency resources for PDCCH repetition within a PDCCH repetition group are the same, the PDCCH repetition is consecutive or back-to-back in time domain, the frequency offset between PDCCH repetition groups can be indicated by gNB via RRC or MAC-CE or ControlResourceSet or SearchSpace.
  • the repetition pattern of PDCCH can be based on time domain with frequency offset, which means, the repetition of PDCCH can be across multiple CORESET or SS in time domain and the frequency resources for PDCCH repetition is different between different PDCCH repetition groups, a PDCCH repetition group include at least one PDCCH repetition, the frequency resources for PDCCH repetition within a PDCCH repetition group are the same, the PDCCH repetition is non-consecutive or non-back-to-back in time domain, the frequency offset between PDCCH repetition groups can be indicated by gNB via RRC or MAC-CE or ControlResourceSet or SearchSpace, the time offset between 2 PDCCH repetition is configured by gNB via RRC or MAC-CE or ControlResourceSet or SearchSpace or the time off set is pre-defined, e.g., equal to multiple time (s) of CORESET size in time domain.
  • the repetition pattern of PDCCH can be based on frequency domain, which means, the repetition of PDCCH can be across one or more CORESET or SS, the time resources for PDCCH repetition is same between all of the PDCCH repetitions, and the frequency resources for PDCCH repetition is different between different PDCCH repetition.
  • the repetition pattern of PDCCH can be based on time and frequency domain, which means, the repetition of PDCCH can be across one or more CORESET or SS, the time resources for a set of PDCCH repetitions is same, and the frequency resources for a set of PDCCH repetitions is different between different PDCCH repetition. If a set of PDCCH repetitions have same time domain resources, then the frequency domain resources of the PDCCH repetitions within the set of PDCCH repetitions are different, if a set of PDCCH repetition have same frequency domain resources, then the time domain resources of the PDCCH repetitions within the set of PDCCH repetitions are different. Mapping rule of PDCCH repetition can be frequency domain first, then time domain.
  • the repetition pattern of PDCCH can be based on time and frequency domain, which means, the repetition of PDCCH can be across one or more CORESET or SS, the time resources for a set of PDCCH repetitions is same, and the frequency resources for a set of PDCCH repetitions is different between different PDCCH repetition. If a set of PDCCH repetitions have same time domain resources, then the frequency domain resources of the PDCCH repetitions within the set of PDCCH repetitions are different, if a set of PDCCH repetition have same frequency domain resources, then the time domain resources of the PDCCH repetitions within the set of PDCCH repetitions are different. Mapping rule of PDCCH repetition can be time domain first, then frequency domain.
  • large CCE aggregation level (AL) for PDCCH can be considered, e.g. 32 and/or 64 AL level CCE of PDCCH can be used, then the CCE aggregation level and corresponding number of candidates can be shown in table 1, with this way, low code rate of PDCCH can be achieved, and thus, coverage capacity can be improved.
  • the CORESET size in time domain can be configured large than 3, e.g. 4 or 6 or 12 or 8.
  • PDCCH can be enabled to process over multiple CORESET or multiple symbols, the number of CORESET or symbols can be indicated by gNB via ControlResourceSet or SearchSpace, where ControlResourceSet or SearchSpace is defined in TS 38.331. With this way, low code rate of PDCCH can be achieved, and thus, the coverage capacity for PDCCH can be improved.
  • a nineth embodiment relates to coverage enhancement for DL/UL channel based on system level.
  • This disclosure propose method (s) to improve the coverage capacity for DL channels under NTN scenario, the beam pattern and beams number within the pattern can be configured to UE, then the power sharing between beams can be achieved, thus, the coverage capacity of DL channels under NTN scenario can be improved.
  • a satellite supporting more simultaneous active satellite beams can result in larger serving area. But on the contrary, it also leads to more reduction for the transmission power over a single beam, naturally yielding more reduced per-beam SNR.
  • the beam pattern information can be indicated by base station via SIB 19, at least one of the following parameters need to be carried within SIB 19: the beam pattern; the beam serving time duration, based on granularity of symbols, slots, ms, a set of symbols; the starting time and/or ending time of pattern; the beams information indication, grouping all of the candidate beams into several groups, each beam group includes at least one beam (s) , then two parts of bit field which are used to indicate the beams information, part1 of the bits field which is used to indicate the beams group information, part2 of the bits field which is used to indicate the actual beams within a beams group.
  • the beam pattern information can be indicated by base station via SIB 1/SIB19 or others systems information. At least one of the following parameters needs to be indicated: the beam pattern; the beam serving time duration, based on granularity of symbols, slots, ms, a set of symbols; the starting time and/or ending time of pattern; the beams information indication, grouping all of the candidate beams into several groups, each beam group includes at least one beam (s) , then two parts of bit field which are used to indicate the beams information, part1 of the bits field which is used to indicate the beams group information, part2 of the bits field which is used to indicate the actual beams within a beams group.
  • the beam pattern information can be indicated by base station via a new SIB, denote as SIB x, the SIB x is a periodic or non-periodic signalling.
  • SIB x is a periodic or non-periodic signalling.
  • non-periodic signalling can be gNB or UE triggered.
  • the beam pattern the beam serving time duration, based on granularity of symbols, slots, ms, a set of symbols; the starting time and/or ending time of pattern; the beams information indication, grouping all of the candidate beams into several groups, each beam group includes at least one beam (s) , then two parts of bit field which are used to indicate the beams information, part1 of the bits field which is used to indicate the beams group information, part2 of the bits field which is used to indicate the actual beams within a beams group.
  • each DTX is related to one or a set of beams of NTN, in other word, a DTX configuration is used for one or a set of beams, for the one or a set of beams will be sharing the same DTX configuration, which means, the DTX configuration for each beam within the set of beams are the same.
  • the beam pattern the beam serving time duration, based on granularity of symbols, slots, ms, a set of symbols; the starting time and/or ending time of pattern; the beams information indication, grouping all of the candidate beams into several groups, each beam group includes at least one beam (s) , then two parts of bit field which are used to indicate the beams information, part1 of the bits field which is used to indicate the beams group information, part2 of the bits field which is used to indicate the actual beams within a beams group.
  • a tenth embodiment relates to TBS determination for OCC based TBoMS PUSCH.
  • This disclosure propose method (s) to determinate the TBS for TBoMS-based PUSCH when Orthogonal Cover Codes (OCC) is enabled.
  • OCC Orthogonal Cover Codes
  • multiple users can be multiplexed on the same time/frequency resource for uplink data transmission, thus, the capacity performance for data rate can be improved.
  • OCC Orthogonal Cover Codes
  • TBoMS-based PUSCH means a PUSCH TB processing over multiple slots, then the data rate can be decreased, thus, coverage capacity can be improved.
  • the TBS for TBoMS-based PUSCH need to scale based on the size of OCC sequence, which means, the TBS for the TBoMS-based PUSCH need to divide by a scale factor, where the scale factor can be equal to the size of OCC sequence.
  • the size of OCC sequence is M
  • TBoMS-based PUSCH with OCC is enabled
  • the TBS for TBoMS-based PUSCH can be determinate based on following way:
  • the UE shall first determine the number of REs (NRE) within the slot:
  • a UE first determines the number of REs allocated for PUSCH within a PRB (N' RE ) by
  • PUSCH repetition Type B is determined assuming a nominal repetition with the duration of L symbols without segmentation.
  • a UE determines the total number of REs allocated for PUSCH (N RE ) as follows:
  • n PRB is the total number of allocated PRBs for the UE and N is the number of slots used for TBS determination indicated by numberOfSlotsTBoMS, and M is the size of OCC sequence, which is indicated by base station via RRC, MAC-CE, DCI or system information (e.g., SIB1) .
  • N RE min (156, N′ RE ) ⁇ n PRB .
  • the TBS for the TBoMS-based PUSCH can be scaled based on a scale factor, the scale factor can be pre-defined or indicated by base station via RRC, MAC-CE, DCI or a system information (e.g., SIB1) .
  • a scale factor can be pre-defined or indicated by base station via RRC, MAC-CE, DCI or a system information (e.g., SIB1) .
  • the TBS for the TBoMS-based PUSCH is determined based on portion time resources of TBoMS-based PUSCH, the portion time resources of TBoMS-based PUSCH is related to the size of OCC sequence, e.g., the larger size of OCC sequence is, the portion time resources of TBoMS-based PUSCH is smaller.
  • the TBS for the TBoMS-based PUSCH is determined based on portion time resources of TBoMS-based PUSCH
  • the portion time resources of TBoMS-based PUSCH is related to size of OCC sequence, e.g., the larger size of OCC sequence is, the portion time resources of TBoMS-based PUSCH is smaller
  • the N RE N′ RE *n PRB , where N′ RE is determination based on the portion time resources of TBoMS-based PUSCH.
  • L is PUSCH allocation in time domain according to Clause 6.1.2.1 for scheduled PUSCH or Clause 6.1.2.3 for configured PUSCH in TS 38.214
  • N is the number of slots used for TBS determination indicated by numberOfSlotsTBoMS
  • M is the size of OCC sequence, which is indicated by base station via RRC, MAC-CE, DCI or a system information (e.g., SIB1) .
  • New MCS e.g., R*Q, R is code rate and Q is modulation order
  • the New MCS and the indicated MCS used a same MCS table.
  • a TB of TBoMS-based PUSCH is enabled OCC
  • the number of slots for TBoMS-based PUSCH is 4
  • the size of OCC is 4
  • the TDRA of the TBoMS-based PUSCH is indicated as 8 symbols via TDRA field within a DCI (it not include DMRS symbol for the PUSCH)
  • the RB number is 30
  • MCS value is 8 (take Table 6.1.4.1-1 defined in TS 38.214 as an example)
  • the MCS index is equal to: 24 (Table 6.1.4.1-1 defined in TS 38.214) .
  • An eleventh embodiment relates to Tx/Rx for XR within a measurement gap/restriction.
  • This disclosure propose methods to enable Tx/Rx within a set of configured measurement gap (s) /restriction (s) .
  • Dynamic indicate UE performing TX/RX for XR service within a set of configured measurement gap (s) /restriction (s) via DCI or semi-static indicate UE performing TX/RX for XR service within a set of configured measurement gap (s) /restriction (s) via RRC or MAC-CE can be considered. With this way, the capacity for XR service can be guarantee.
  • eXtended Reality (XR) and Cloud Gaming are some of the most important 5G media applications under consideration in the industry.
  • XR is an umbrella term for different types of realities and refers to all real-and-virtual combined environments and human-machine interactions generated by computer technology and wearables. It includes representative forms such as Augmented Reality (AR) , Mixed Reality (MR) and Virtual Reality (VR) and the areas interpolated among them.
  • AR Augmented Reality
  • MR Mixed Reality
  • VR Virtual Reality
  • the capacity enhancement for XR has been studied in Rel-17 SI and the purpose of capacity study is to understand the performance of NR systems for XR applications, and identify any issues and performance gaps, which could be useful for understanding the limitation of current NR systems in supporting XR applications and the potential directions for future necessary enhancements to better support XR.
  • a UE In current specification, during a measurement gap/restriction, a UE cannot transmit/receive data except for random access procedure.
  • XR services are with low latency, jitter and large packet size, when XR traffic is arrival close to or during a measurement gap, after UE perform RRM measurement during the measurement gap/restriction, the remaining time of latency budget is not enough for the UE to transmit a XR traffic whole.
  • the performance of XR service will be decreased, to handle of this, enabling Tx/Rx for XR during measurement gap/restriction is a suitable way, following methods can be considered.
  • a group common DCI can be used to indicate a set of UE to skip a set of configured measurement gap (s) /restriction (s) , the DCI is scrambled by a G-RNTI, at least one of the following fields need to include:
  • the UE group ID field which is used to indicate the group ID for a set of UEs, a UE group include at least one of UE (s) .
  • the size can be equal to the number of UEs within a UEs group and/or a bitmap can be used to indicate which UEs within a UE group need to skip measurement gap/restriction. If this field is absent within a DCI, then all of the UEs within a UE group ID which is indicated by the DCI need to skip measurement gap restriction.
  • Number of measurement gaps/restrictions indication field which is used to indicate the skipped number of measurement gap/restriction from the first measurement gap/restriction after the DCI.
  • a time domain window indication field which is used to indication a time domain window, all of the measurement gap/restriction within the time domain window can be skipped.
  • the starting point of the time domain window can be based on the time location of the DCI, e.g., the starting point of the time domain window can be from the first slot after the DCI or last symbol of the DCI.
  • the starting point of the time domain window can be based on the time location of the DCI and a time offset
  • the time offset can be configured by base station via RRC, MAC-CE, DCI or pre-defined
  • the time offset granularity can be symbol, slot, ms, a set of symbols or a set of slots.
  • the set of candidate of number of measurement gap/restriction value or time domain window value can be configured by based station via RRC, MAC-CE or RRC and MAC-CE, then the field of number of measurement gaps/restrictions indication or a time domain window indication used to indicate one value within the set of candidate of number of measurement gap/restriction or the set of candidate of time domain window.
  • a MAC-CE can be used to indicate a UE to skip/activation/de-activation a set of configured measurement gap (s) /restriction (s) , at least one of the following fields need to include:
  • number of measurement gaps/restrictions indication field which is used to indicate the skipped number of measurement gap/restriction from the first measurement gap/restriction after the MAC-CE.
  • a time domain window indication field which is used to indication a time domain window, all of the measurement gap/restriction within the time domain window can be skipped.
  • the starting point of the time domain window can be based on the time location of the DCI, e.g., the starting point of the time domain window can be from the first slot after the DCI or last symbol of the DCI.
  • a measurement gap/restriction pattern indication field which is used to indicate a measurement gap/restriction pattern, where, the pattern means within a periodicity, a set of measurement gap/restriction can be skipped and a set of measurement gap/restriction cannot be skipped, where the measurement gap/restriction pattern is configured by gNB via RRC.
  • UE need to skip measurement gap/restriction after a time duration, the time duration is from the time location of the MAC-CE or the last symbol of the MAC-CE to a HARQ-ACK feedback location in time domain, the HARQ-ACK is a HARQ feedback of the MAC-CE.
  • the starting point of the time domain window can be based on the time location of the MAC-CE and a time offset
  • the time offset can be configured by base station via RRC, MAC-CE, DCI or pre-defined
  • the time offset granularity can be symbol, slot, ms, a set of symbols or a set of slots.
  • a RRC can be used to indicate a UE to skip a set of configured measurement gap (s) /restriction (s) , at least one of the following fields need to include:
  • number of measurement gaps/restrictions indication field which is used to indicate the skipped number of measurement gap/restriction from the first measurement gap/restriction after the RRC.
  • a time domain window indication field which is used to indication a time domain window, all of the measurement gap/restriction within the time domain window can be skipped.
  • the present invention discloses an apparatus for wireless communication, comprising a processor and a memory, wherein the memory is configured to store program instructions which, when executed by the processor, causes the processor to perform the method of any of the paragraphs above, as shown in FIG. 22.
  • the apparatus may be, for example, a base station or a user equipment.
  • a base station 100 is taken as an example of the apparatus.
  • the base station 100 includes a processor 130 and a memory 150.
  • the present invention discloses a computer readable media storing program instructions that, when executed by a processor, cause the processor to perform the method of any of the paragraphs above.
  • a measurement gap/restriction pattern indication field which is used to indicate a measurement gap/restriction pattern, where, the pattern means within a periodicity, a set of measurement gap/restriction can be skipped and a set of measurement gap/restriction cannot be skipped.

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

Abstract

Une pluralité de procédés d'amélioration de couverture de liaison descendante pour une station de base et un équipement utilisateur dans un scénario NTN sont fournis pour améliorer la couverture et l'efficacité pour un PDCCH et un PDSCH dans des réseaux cellulaires. Les procédés comprennent une planification de PDCCH sur de multiples CORESET, à l'aide d'un niveau d'agrégation de CCE élevé, et un groupage DMRS pour un PDSCH.
PCT/CN2024/092729 2024-05-11 2024-05-11 Procédé d'amélioration de couverture de liaison descendante pour station de base et équipement utilisateur Pending WO2025236128A1 (fr)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103391563A (zh) * 2012-05-11 2013-11-13 中兴通讯股份有限公司 下行控制信息发送方法、检测方法、基站及用户设备
CN111247766A (zh) * 2018-04-05 2020-06-05 Lg电子株式会社 在无线通信系统中发送或接收信号的方法及其设备
WO2020259838A1 (fr) * 2019-06-27 2020-12-30 Apple Inc. Techniques de formation de faisceau d'équipement utilisateur
WO2021184282A1 (fr) * 2020-03-19 2021-09-23 Qualcomm Incorporated Groupage de signaux de référence de démodulation
CN114830779A (zh) * 2019-12-20 2022-07-29 高通股份有限公司 对组合物理下行链路控制信道候选中的下行链路控制信息进行解码
CN116711430A (zh) * 2021-01-13 2023-09-05 苹果公司 无线通信中的参考信号传输的动态适应

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103391563A (zh) * 2012-05-11 2013-11-13 中兴通讯股份有限公司 下行控制信息发送方法、检测方法、基站及用户设备
CN111247766A (zh) * 2018-04-05 2020-06-05 Lg电子株式会社 在无线通信系统中发送或接收信号的方法及其设备
WO2020259838A1 (fr) * 2019-06-27 2020-12-30 Apple Inc. Techniques de formation de faisceau d'équipement utilisateur
CN114830779A (zh) * 2019-12-20 2022-07-29 高通股份有限公司 对组合物理下行链路控制信道候选中的下行链路控制信息进行解码
WO2021184282A1 (fr) * 2020-03-19 2021-09-23 Qualcomm Incorporated Groupage de signaux de référence de démodulation
CN116711430A (zh) * 2021-01-13 2023-09-05 苹果公司 无线通信中的参考信号传输的动态适应

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