WO2019016987A1 - Système et procédés destinés à être utilisés dans l'émission et la réception d'informations système dans une communication sans fil avancée - Google Patents

Système et procédés destinés à être utilisés dans l'émission et la réception d'informations système dans une communication sans fil avancée Download PDF

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Publication number
WO2019016987A1
WO2019016987A1 PCT/JP2018/004502 JP2018004502W WO2019016987A1 WO 2019016987 A1 WO2019016987 A1 WO 2019016987A1 JP 2018004502 W JP2018004502 W JP 2018004502W WO 2019016987 A1 WO2019016987 A1 WO 2019016987A1
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Prior art keywords
burst set
pbch
ssb
window
trp
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PCT/JP2018/004502
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English (en)
Inventor
Phong Nguyen
Rajitha Palipana
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Nec Corporation
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Priority claimed from AU2017902847A external-priority patent/AU2017902847A0/en
Application filed by Nec Corporation filed Critical Nec Corporation
Publication of WO2019016987A1 publication Critical patent/WO2019016987A1/fr

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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
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H04L5/0035—Resource allocation in a cooperative multipoint environment
    • 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
    • H04L5/0058—Allocation criteria
    • H04L5/0073—Allocation arrangements that take into account other cell interferences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space

Definitions

  • the present invention generally relates to a next generation or 5G wireless
  • the present invention generally relates to a system and methods for transmitting and receiving synchronisation signal blocks in a multi-beams environment of an establishing radio interface cloud.
  • gNB Logical Access node handling transmission/reception in multiple TRPs in a NR system. Commonly, corresponding to NR-base station
  • the 4th generation (4G) telecommunications systems have been successfully deployed at accelerating pace all over the world, which enables more and more advanced services and applications making use of the inherent benefit of LTE/LTE-A/LTE-A Pro technologies (such as higher data rate, lower latency, enhanced coverage, and sidelink communication). Attentions are now on the development of 5th generation (5G) technology and services. Although the design and deployment of any wireless system or cellular system takes many years, development of the 5G technology systems is now being investigated progressively in 3 GPP standardisation community. With the target for commercial deployment of 5G system being initially planned for 2020 and lately being brought forward to 2018, work has started in International
  • NR-PSS is defined for initial symbol boundary synchronization to a NR cell
  • NR-SSS is defined for detection of NR cell ID or at least part of NR cell ID.
  • At least one non-scheduled broadcast channel i.e. NR-PBCH
  • NR-MIB minimum system information
  • NR-PSS, NR-SSS and NR-PBCH are time-division multiplexed and transmitted within every SS block which corresponds to N consecutive OFDM symbols and N is a constant.
  • N is a constant.
  • NR-SSS is mapped on one OFDM symbol
  • NR-PSS is mapped on another OFDM symbol and before NR-SSS, and there are at most 4 OFDM symbols are reserved for PBCH.
  • a UE shall be able to identify at least OFDM symbol index, slot index in a radio frame and radio frame number.
  • One or multiple SS block(s) compose an SS burst set.
  • L is 4 for frequency range up to 3 GHz; L is 8 For frequency range from 3 GHz to 6 GHz; and L is 64 For frequency range from 6 GHz to 52.6 GHz.
  • SS Burst set transmission is periodic where SS Burst set periodicity is configurable which can be selected from the set of [5ms, 10ms, 20ms, 40ms, 80ms and 160ms]. Transmission of SS Blocks within a SS Burst set is confined to a 5ms window regardless of SS burst set periodicity. A UE may assume that a given SS block is repeated with a SS burst set periodicity.
  • NR-PBCH contents in a given repeated SS block may change.
  • the UE may neither assume the gNB transmits the same number of physical beam(s), nor the same physical beam(s) across different SS-blocks within an SS burst set.
  • UE can assume default SS burst set periodicity of 20ms regardless of frequency bands and configured SS burst set periodicity.
  • 3 GPP RAN-WGl has identified that the contents in a NR-MIB shall include part of SFN having
  • bits for at least 80ms granularity indication, timing information within a radio frame having [0-7] bits for information such as SS block (i.e. SSB) time index [0-6] bits (i.e. b ⁇ b ⁇ b ⁇ Non Patent Literature 11) and half radio frame timing [0-1] bit (i.e. c 0 Non Patent Literature 11), and RMSI scheduling information with yet defined number of bits.
  • the contents in a NR-MIB may further include SS burst set periodicity of [0-3] bits or burst set index 10ms granularity within BCH TTI (i.e. s 2 s i s Q Non Patent Literature 11).
  • PBCH at radio frame level would be sufficient for indicating 8 different radio frames within any PBCH TTI implicitly (i.e.. s 2 S S 0 ).
  • This means a UE in a NR system has to use 8 predefined scrambling codes for blind decoding of a redundancy or time version of PBCH at SS Block.
  • half radio frame timing of 1 bit being included in a NR-MIB is necessary for differentiating a detected SS block within a SS burst set in the first half and the one in the second half of a radio frame (i.e. c 0 ).
  • the introduction of half radio frame timing of 1 bit in a NR-MIB shall restrict soft combine of PBCH's redundancy or time version on a detected SS block within SS burst set in the first half radio frame and the repeated one in the second half radio frame to improve the decodability.
  • the introduction of half radio frame timing of 1 bit in a NR-MIB shall violate the assumption that a given SS block is repeated with a SS burst set periodicity and therefore requires UE to handle 5ms burst set periodicity case differently (i.e. the PBCH of repeated SSBs in the burst set within the first half of a radio frame and the associated one the second half of the radio frame cannot be combined).
  • a straight-forward solution for this case is to increase number of differentiable scrambling codes from 8 to 16 to assist the indication of 8 different radio frames within any PBCH TTI and whether the decodable SS block being in the 1st half of the radio frame or second half of the radio frame implicitly.
  • the increase of number differentiable scrambling codes for blind decoding of PBCH to either 8 or 16 shall directly increase the number of blind decoding of
  • PBCH at a UE in NR system by 2-folds or 4-folds or more regardless of configured SS burst set periodicity when being compared to LTE-based technology.
  • configured SS burst set periodicity 5ms and 10ms
  • sixteen or eight differentiable scrambling codes for implicitly indicating of radio frame numbers within a PBCH TTI may appear necessary.
  • the adoption of sixteen or eight differentiable scrambling codes for implicitly indicating a radio frame number within a PBCH TTI shall become unnecessary overhead for UE in an NR system as a UE may have to perform twice or more numbers of blind decoding than it is required to detect & decode an NR-PBCH.
  • the preferred embodiment describes the method for generating a set scrambling codes for use within an SS burst set regardless of SS burst set periodicity and associated configuring method for use in a communication system with cloud radio interface that provides wireless connectivity services to mobile equipment in the region.
  • NPL 1 ITU-R M.2083-0 (09/2015) - IMT Vision - Framework and overall objectives of the future development of IMT for 2020 and beyond
  • NPL 2 TR 22.891 vl4.0.0 (2016-03) - Feasibility Study on New Services and Markets Technology Enablers
  • NPL 3 TR 23.799 v0.5.0 (2016-05) - Study on Architecture for Next Generation System NPL 4: TR 38.802 - Study on NR New Radio Access Technology (Release 14)
  • NPL 5 TR 38.913 - Study on Scenarios and Requirements for Next Generation Access Technologies (Release 14)
  • NPL 6 TS 36.211 vl4.1.0 (2016-12) - Physical Channels and modulation (Release 14)
  • NPL 7 TS 36.212 vl4.1.0 (2016-12) - Multiplexing and channel coding (Release 14)
  • NPL 8 TS 36.213 vl4.1.0 (2016-12) - Physical layer procedures (Release 14)
  • NPL 9 TS 36.321 vH.l .O (2016-12) - Medium Access Control protocol (Release 14)
  • NPL 10 TS 36.331 vl4.0.0 (2016-09) - Radio Resource Control (Release 14)
  • NPL 11 3 GPP TSG RAN WG1 NR Ad-Hoc#2, RANI Chairman's Notes
  • a method for use in a scalable New Radio (NR) system that comprises at least one logical access node (gNB) and a plurality of associated transmission reception points (TRPs) forming virtual radio interface cloud that provides beam formed wireless connectivity services to a plurality of new radio-user equipments (NR-UEs), the method comprising the steps of:
  • SS Burst set periodicity SS Burst set start, and/or anchored SS Burst set;
  • SSB can at least comprise PSS, SSSX and PBCH or PBCHs;
  • a NR-UE in a local radio interface cloud performing SSBs detection and associated PBCHs decoding to identify at least available beams for connectivity services at its location, slot boundary, Virtual Cell's identities (IDs) or Virtual cloud radio interface IDs, orthogonal frequency-division multiplexing (OFDM) symbol index, slot index in a radio frame, radio frame number and/or any other minimum system information.
  • IDs Virtual Cell's identities
  • OFDM orthogonal frequency-division multiplexing
  • An embodiment of the present invention is directed to systems and methods for use in an advanced wireless communication system, such as the fifth generation (5G) or New Radio (NR) as being defined in 3 GPP, with cloud radio interface providing wireless connectivity services including initial access services to plurality of new radio capable UEs, through coordinated transmission of synchronization signals blocks (SSBs) from multiple transmission and reception points (TRPs) without interfering with one another within a multi-beams environment, which may at least partially overcome at least one of the disadvantages, or fulfil at least one of the requirement identified or discussed in the Background Art section, or provide the consumer with a useful or commercial choice.
  • 5G fifth generation
  • NR New Radio
  • an embodiment of the present invention is related to
  • SSBs synchronization signal Blocks
  • PSS primary synchronisation signal
  • SSS secondary synchronisation signals
  • PBCH physical broadcast channels
  • the system providing beam-formed cloud radio interface for servicing at plurality of UEs may comprise a logical access node (gNB) and plurality of time-synchronised TRPs.
  • the said TRPs forming the radio interface cloud may be configured or reconfigured to share the same carrier frequency and carrier/operational bandwidth in transmitting beam-formed SSB(s) periodically.
  • a set of periodic beam-formed SSBs may appear in burst which is strictly confined within 5ms window, where the burst set periodicity is configurable with a value being selected from the set of [5, 10, 20, 40, 80 and 160ms].
  • a UE may be required to implicitly and explicitly identify at least the 10ms radio frame number at 5ms granularity, slot index in the radio frame, OFDM symbol index in the slot and Virtual Cell's ID or Virtual cloud radio interface ID.
  • a TRP may be configured to transmit its first SS burst set in the 1st, 2nd, 3rd or 4th window of 5ms within a PBCH TTI of 80ms using the 'SS Burst set start' IE.
  • Multiple SFN-synchronised TRPs forming the cloud radio interface for local service may be
  • 'anchored SS Burst set' IE to enable a TRP to reconfigure its 'SS Burst set periodicity' on PBCH TTI basis. Regardless of SS Burst set periodicities, there is always a burst set being transmitted in the configured anchored SS Burst set window of 5ms.
  • An 'anchored SS Burst set' may be configured or reconfigured to be in the 1st, 2nd, 3rd or 4th window of 5ms within a PBCH TTI of 80ms, and may be the same as the configured or reconfigured ' SS Burst set start' .
  • TRPs being configured or reconfigured with the same 'SS Burst set start' or 'anchored SS Burst set', they may be further configured with non-overlapping SSBs mapping patterns namely localised, distributed or combination of localised and distributed to enable inter TRPs
  • the said two or more TRPs may share the same set of beam indexes.
  • a SSB can be flexibly mapped in any possible candidate SSB locations within a burst set of 5ms, and the timing position of an SSB block within a 5ms burst set may be indicated using 7-bits information to assist the aforementioned versatile SSB mapping patterns.
  • the 3 -bits among the said 7-bits may be used to indicate implicitly or explicitly whether a SSB is within the 1st, 2nd, 3rd, 4th or 5th lms-interval of a 5ms burst set interval, and the remaining 4-bits may be used to indicate explicitly the slot index within the 1ms interval that a SSB belongs to.
  • a periodic sequence of 5ms in length may be used.
  • the said periodic sequence may be truncated into five equal lms-sequences, where the 1st , 2nd, 3rd, 4th, and 5th truncated sequences are used as DMRS for PBCHs transmission/reception within the 1st, 2nd, 3rd, 4th or 5th lms-interval of a 5ms burst set interval respectively.
  • SSBs being mapped in the first half and second half of a 14-symbol slot may be further distinguishable by differentiable arrangement of PSS and SSS e.g. consecutive PSS and SSS (i.e. first format) vs spacing PSS and SSS (i.e. second format).
  • the said implicit indication of SSBs being mapped in the first half and second half of a 14-symbol slot may further allow the PBCHs being associated with 2 normal SSBs mapping to a single 14-symbol slot to carry the same payload for soft combine at a UE.
  • a new-radio capable UE upon detecting a PSS, it may further attempt to detect the associated SSS at 2 different time positions depending on whether an SSB being transmitted in the first half or second half of a 14-symbol slot.
  • the configured 'SS burst set periodicity' is 40ms and larger, the number of SS Bursts per PBCH TTI is 2 and less.
  • the extended SSB is proposed for used when SS Burst periodicity of 40ms or larger is configured.
  • an extended SSB comprises the normal SSB and additional 2 OFDM-symbols for the mapping of additional PBCH redundancy or time version and there is at most one (1) extended SSB being mapped into a
  • the 14-symbol slot When SS Burst periodicity of 80ms or 160ms is configured, the only scheduled SS burst set is retransmitted in the immediately followed 5ms window.
  • the first extended SSB format may be used for SSB mapping, where the second extended SSB format may be used for SSB mapping in the retransmitted SS burst set or via versa.
  • SSSX sequences namely SSS1 and SSS2 for use alternatively at SS Burst set level
  • SSS1 may be used in every SSBs within the first burst set of a PBCH TTI to assist the missed detected SSBs at SS Burst set level or implicit indication of SS Burst set periodicity.
  • SSS1 is used on every SSBs in the scheduled and retransmitted SS burst sets to assist the differentiation between retransmitted SS Burst set and Burst set with 5ms periodicity.
  • a set of four (4) differentiable scrambling codes for use on PBCH's scrambling are predefined to implicitly indicate the 80ms timing at 5 ms granularity.
  • the 4 predefined scrambling codes may be used to generate a unique sequence of 16 scrambling code elements being indexed from 1 to 16, where each indexed element (i.e. 1, 2 to 16) in the said sequence points to the scrambling code and the corresponding PBCH redundancy or time version for use in transmitting PBCHs in the corresponding window of 5ms within a PBCH TTI (i.e. 1st 5m window, 2nd 5ms window, ... to 16th 5ms window).
  • the first, second, third and fourth predefined scrambling codes may correspond to the first, second, third and fourth redundancy or time versions of a PBCH respectively.
  • a UE may perform at most 4 blind decoding attempts on a PBCH and may further use detected SSSX (i.e. SSS1 or SSS2) to determine the 80ms timing at 5ms granularity (i.e. radio frame number and 1st half or second half of the radio frame).
  • the 4 predefined scrambling codes may be used for scrambling all four redundancy or time versions of a PBCH in generating 16 scrambled PBCH redundancy versions (i.e. 4 scrambling codes by 4 redundancies).
  • the first redundancy version of a PBCH being scrambled with the first, second, third and fourth predefined
  • scrambling codes may be for the first 20ms window of a PBCH TTI at 5ms window granularity; the second redundancy version of a PBCH being scrambled with the first, second, third and fourth predefined scrambling codes may be for the second 20ms window of a PBCH TTI at 5ms window granularity; the third redundancy version of a PBCH being scrambled with the first, second, third and fourth predefined scrambling codes may be for the third 20ms window of a PBCH TTI at 5ms window granularity; and the fourth redundancy version of a PBCH being scrambled with the first, second, third and fourth predefined scrambling codes may be for the fourth (i.e.
  • a UE may perform at most 16 blind decoding attempts on a PBCH to determine the 80ms timing at 5ms granularity i.e. radio frame number and 1st half or second half of the radio frame.
  • Fig. 1 illustrates a 5G Communication system - A virtual Cloud Radio Interface.
  • Fig. 2 illustrates a method of generating scrambling codes set for use in NR-PBCH's scrambling function and NR-PBCH to SS Burst set mapping function in a 5G mobile
  • Fig. 3 illustrates an exemplary PBCH transmission using the disclosed method in a system where the SS Burst set transmission periodicity configuration is 5ms, enabling NR-UEs in different modes (i.e. initial cell selection, CONNECTED-MODE, IDLE-MODE, INACTIVE MODE) to acquire NR-MIB.
  • initial cell selection CONNECTED-MODE, IDLE-MODE, INACTIVE MODE
  • Fig. 4 illustrates an exemplary PBCH transmission using the disclosed method in a system where the SS Burst set transmission periodicity configuration is 10ms, enabling NR-UEs in different modes (i.e. initial cell selection, CONNECTED-MODE, IDLE-MODE, INACTIVE MODE) to acquire NR-MIB.
  • initial cell selection CONNECTED-MODE, IDLE-MODE, INACTIVE MODE
  • Fig. 5 illustrates an exemplary PBCH transmission using the disclosed method in a system where the SS Burst set transmission periodicity configuration is 20ms, enabling NR-UEs in different modes to acquire NR-MIB.
  • Fig. 6 illustrates an exemplary Channel coding structure for the transmission of NR-BCH transport channel at a 5G base-station.
  • Fig. 7 illustrates an alternative method of generating scrambling codes set for use in
  • NR-PBCH's scrambling function and NR-PBCH to SS Burst set mapping function in a 5G mobile communication system assisting the implicit detection of radio frame number upon successful decoding of NR-PBCH(s).
  • Fig. 8 illustrates an exemplary (Macro) interference coordination in transmitting minimum system information (NR-MIB) among TRPs forming radio interface cloud in 5G system by using the novel 'SS Burst set start' configuration parameter.
  • NR-MIB minimum system information
  • Fig. 9 illustrates SSBs transmission method for a configured SS Burst set periodicity ⁇ 1 ⁇ 4 PBCH TTI (i.e. 20ms, 10ms and 5ms).
  • Fig. 10 illustrates SSBs transmission method for a configured SS Burst set periodicity
  • Fig. 11 illustrates SSBs transmission method for a configured SS Burst set periodicity > PBCH TTI (i.e. 80ms and 160ms).
  • Fig. 12 illustrates an exemplary Extended SSB structures and Extended SSB to NR-Slot mapping.
  • Fig. 13 illustrates an exemplary (Micro) interference coordination in transmitting minimum system information (i.e. NR-MIB) among TRPs forming radio interface cloud in 5G system by using the method of mapping SSBs within a SS Burst set with the assistance of hybrid signalling method in indicating SSB timing index.
  • minimum system information i.e. NR-MIB
  • Fig. 14 illustrates an exemplary dynamic 'SS Burst set periodicity' reconfiguration - where the 1st 5ms window is configured as 'anchored SS burst set'.
  • Fig. 15 illustrates an exemplary dynamic 'SS Burst set periodicity' reconfiguration - where the 4th 5ms window is configured as 'anchored SS burst set'.
  • Fig. 1 exemplarily illustrates a 5G wireless communication system with radio interface cloud, method of transmitting synchronisation signal blocks (i.e. SSBs) with interference coordination, and apparatus in which the exemplary embodiment of the invention may be analysed, discussed or practices to advance.
  • the wireless communication system (10) may be considered as an evolution beyond the traditional cellular network, where the well-defined cellular concept is no longer applicable.
  • the wireless communication system (10) comprises a gNB (30) which is connected to and control plurality of TRPs (e.g. Transmission and reception points: 11, 12, 13, and 14) which forms a cloud radio interface, providing wireless connectivity services to plurality of NR-UEs (i.e. UEs with new radio capability e.g.
  • all TRPs forming the cloud radio interface are time-synchronised and SFN-synchronised where any UE operating in the said cloud radio interface is initially required to synchronise and then maintain the synchronisation with one or more indexed beams provided by one or more TRPs for wireless connectivity services.
  • the network may find and locate UE for providing the requested services where a dedicated beam provided by one TRP may be used to service one UE (e.g. 21, 24) or two or more UEs (e.g. 22 & 23). For moving UE (e.g.
  • the UE may initially synchronise to one or more beams (15) provided by a TRP (UE at 20.1 and TRP 11). While moving in the cloud radio interface (UE path 20.0), the UE (e.g. UE 20) may concurrently synchronise to multiple beams provided by two or more TRPs (e.g. 20.2, 20.3 and 20.4).
  • Synchronising to multiple beams provided by multiple TRPs simultaneously may further require the network to configure its TRPs to transmit their SSBs in coordinated manner in such a way that the transmitted SSBs from neighbouring TRPs will not interfere with one another and allow a UE within a nominated period of time such as 20ms to be able to detect suitable beams for services from its surrounding TRPs.
  • a set of four (4) predefined scrambling codes is used as input to the method that generates a sequence of 16 scrambling codes comprising multiple copies of 4-predefined scrambling codes being arranged in a unique sequences, where full set of the generated sequence or sub-sets of the generated sequence being methodologically selected for scrambling PBCH redundancy or time version at a gNB will depend on the SS Burst set periodicity configuration and SS Burst set start window configuration.
  • the aforementioned method (100) may take a set of 4 predefined
  • scrambling codes (110) i.e. the first scrambling code (111), the second scrambling code (112), the third scrambling code (113) and the fourth scrambling code (114) as inputs to generate a 4x4 square matrix (115) of 16 elements, where an each element in the 4x4 matrix (i.e. E.01 , E.02, E.03, ..., E.15, E.16) is a scrambling code index in the set of ⁇ the first scrambling code (111), the second scrambling code (112), the third scrambling code (113) and the fourth scrambling code (114) ⁇ .
  • the 4x4 matrix (115) is generated by taking the first scrambling code (111), the second scrambling code (112), the third scrambling code (113) and the fourth scrambling code (114) as the 4 elements (E.01, E.05, E.09, and E.13) forming the first row (120).
  • the first row is generated by taking the first scrambling code (111), the second scrambling code (112), the third scrambling code (113) and the fourth scrambling code (114) as the 4 elements (E.01, E.05, E.09, and E.13) forming the first row (120).
  • the first row 120
  • the second row (121) is then "cyclic-shifted” to create the further 4 elements (E.03, E.07, E.l l, and E.15) of third row (122);
  • the third row (122) is "cyclic-shifted" for the last time to create the last 4 elements (E.04, E.08, E.12, and E.16) of the fourth row (123).
  • the first column (126) comprises the 4 scrambling code indexes for use within the 1st 20ms window (102) of a PBCH TTI (101)
  • the second column (127) comprises the 4 scrambling code indexes for use within the 2nd 20ms window (103) of a PBCH TTI (101)
  • the third column (128) comprises the 4 scrambling code indexes for use within the 3rd 20ms window (104) of a PBCH TTI (101)
  • the fourth column (129) comprises the scrambling code indexes for use within the last 20ms window (105) of a PBCH TTI (101).
  • any column i.e.
  • each element represents the scrambling code index for use on PBCHs within 5ms of the corresponding 20ms window (i.e. pair of consecutive even and odd radio frames).
  • the 1st elements represent the scrambling code index for use within the 1st 5ms (106) of the corresponding 20ms window (i.e. 102, 103, 104, or 105);
  • the 2nd elements represent the scrambling code index for use within the 2nd 5ms (107) of the corresponding 20ms window (i.e. 102, 103, 104, or 105);
  • the 3rd elements represent the scrambling code index for use within the 3rd 5ms (108) of the corresponding 20ms window (i.e. 102, 103, 104, or 105);
  • the last elements represent the scrambling code index for use within the last 5ms (109) of the corresponding 20ms window (i.e. 102, 103, 104, or 105).
  • the scrambling code indexes for use on transmitted PBCHs at every 5ms intervals in a PBCH TTI of 80ms can be read out element- wise from the matrix (115), column by column (125) starting from element (E.01) in the first column (126) and finishing at element (E.16) in the last column (129).
  • Example (130) shown in Fig. 3 further illustrates the generated sequence of scrambling codes indexes within PBCH TTI of 80ms for 5ms burst set periodicity configuration.
  • a UE may detect a SS block in the burst set within the first 5ms window of radio frame 8k (106), however it may fail to decode the associated PBCH after 4 blind decoding attempts.
  • the UE may attempt to combine at most 4 redundancy or time versions of PBCH in SS blocks being detected at 20ms intervals within a PBCH TTI of 80ms window which may result in successful decoding of PBCH (131) where the scrambling code sequence of ⁇ 1st; 2nd; 3rd; and 4th ⁇ enabling the successful PBCH decoding may further indicate the first detected SS block is in the first half of radio frame 8k (106).
  • the successful decoding of PBCH (132) using scrambling codes sequence of ⁇ 2nd; 3rd; 4th; and 1st ⁇ may indicate the first detected SS block is in the second half of radio frame 8k (107);
  • the successful decoding of PBCH (133) using scrambling codes sequence of ⁇ 3rd; 4th; 1st and 2nd ⁇ may indicate the first detected SS block is in the first half of radio frame 8k+l (108);
  • the successful decoding of PBCH (133) using scrambling codes sequence of ⁇ 4th; 1st ; 2nd and 3rd ⁇ may indicate the first detected SS block is in the second half of radio frame 8k+l (109).
  • Any consecutive successful decoding of SS blocks resulting in the same PBCH content at 5ms interval (139) further implies the network configured 5ms burst set periodicity.
  • CONNECTED-MODE or INACTIVE-MODE may attempt to combine PBCHs in detected SS blocks at consecutive 5ms-intervals using the generated sequence of scrambling codes indexes (e.g. 135, 136, 137, 138) to improve the PBCH decodability as well as to detect if SS burst set periodicity has been changed.
  • the scrambling code indexes for use on transmitted PBCHs at every 10ms intervals in a PBCH TTI of 80ms can be read out, from the matrix (115), at the rate of every second elements, column by column (125) starting from element (E.01) or element (E.02) in the first column (126) and finishing at element (E.15) or element (E.16) in the last column (129) depending on whether the first 5ms (106) or the 2nd 5ms (107) of the first 20ms window (i.e. first radio frame of the PBCH TTI) being selected for the SS Burst set start window.
  • FIG. 4 further illustrates the generated sequence of scrambling codes indexes within PBCH TTI of 80ms for 10ms burst set periodicity configuration where the first 5ms (106) of the first 20ms window (102) being selected for the SS Burst set start.
  • a UE at initial cell selection state it may detect a SS block in the burst set within the first 5ms window of radio frame 8k (106), however it may fail to decode the associated PBCH after 4 blind decoding attempts.
  • the UE may attempt to combine at most 4 redundancy versions of PBCH in SS blocks being detected at 20ms intervals within a PBCH TTI of 80ms window which may result in successful decoding of PBCH (141) where the scrambling code pattern of ⁇ 1st; 2nd; 3rd; and 4th ⁇ enabling the successful PBCH decoding may further indicate the first detected SS block is in the first half of radio frame 8k (106).
  • the successful decoding of PBCH (143) using scrambling codes pattern ⁇ 3rd; 4th; 1st and 2nd ⁇ may indicate the first detected SS block is in the first half of radio frame 8k+l (108).
  • Consecutive successful decoding of SS blocks resulting in the same PBCH content at 10ms interval (149) further implies the network configured 10ms burst set periodicity.
  • CONNECTED-MODE or INACTIVE-MODE may attempt to combine PBCHs in detected SS blocks at consecutive lOms-intervals using the generated sequence of scrambling codes indexes (e.g. 145, 147) to improve the PBCH decodability as well as to detect if SS burst set periodicity has been changed.
  • the scrambling code indexes for use on transmitted PBCHs at every 20ms intervals in a PBCH TTI of 80ms can be read out, from the matrix (115), at the rate of every fourth elements, column by column (125) starting from element (E.01), element (E.02), element (E.03), or element (E.04) in the first column (126) and finishing at element (E.13), element (E.14), element (E.15), or element (E.16) in the last column (129) depending on whether the first 5ms (106), the 2nd 5ms (107), the 3rd 5ms (108), or the 4th 5ms (109) of the first 20ms window being selected as for the SS Burst set start window.
  • Example (150) shown in Fig. 5, further illustrates the generated sequence of scrambling codes indexes within PBCH TTI of 80ms for 20ms burst set periodicity configuration where the first 5ms (106) of the first 20ms window (102) being selected for the SS Burst set start.
  • the scrambling code indexes for use on transmitted PBCHs in a PBCH TTI of 80ms can be read out, from the matrix (115), at the rate of every fourth elements, column by column (125) starting from element (E.01), element (E.02), element (E.03), or element (E.04) in the first column (126) and finishing at element (E.13), element (E.14), element (E.15), or element (E 16) in the last column (129) depending on whether the first 5ms (106), the 2nd 5ms (107), the 3rd 5ms (108), or the 4th 5ms (109) of the first 20ms window being selected for the SS Burst set start window.
  • the generated scrambling code indexes sequences for transmitting a PBCH and its redundancies will comprise the first scrambling code (E.01), second scrambling code (E.05), third scrambling code (E.09), and fourth scrambling code (E.13).
  • first 2 generated scrambling code indexes i.e. the first scrambling code (E.01) and second scrambling code (E.05) are used for scrambling the transmitted PBCH and its first redundancy respectively which are then mapped to the will-be-disclosed extended SS Block within the designated SS Burst set start.
  • second 2 output scrambling code indexes i.e. the third scrambling code (E.09), and fourth scrambling code (E.13), are used for scrambling the transmitted PBCH's second and third redundancies respectively which are then mapped to the extended SS Block within a SS burst set being associated with the designated SS Burst set start.
  • the said SS burst set being associated with the designated SS Burst set start is a repeated version of the SS Burst set start which is preferably transmitted within a 5ms window that immediately follows the 5 ms window.
  • the above disclosed method for generating scrambling codes at every 5ms windows within a PBCH TTI of 80ms regardless of the configured 'SS burst set periodicity' can be implemented through 2 separate functions i.e. scrambling function and SS burst set mapping function as being illustrated in the NR-PBCH channel coding structure (200) - Fig. 6.
  • the NR-PBCH channel coding structure may take at least NR-BCH transport block (201) and SSB time index (202) as inputs for CRC insertion function (210).
  • the full or partial SSB time index (202) may be explicitly used for indication of the SS block in a SS Burst set and upon the successful detection and decoding of one or more repeated SSBs, OFDM symbol index, slot index in a radio frame and radio frame number can be determined.
  • the NR-BCH transport block (201) and SSB time index (202) with CRC are used to generate 4 PBCH's redundancy or time versions naming PBCHRV0 (221), PBCHRV1 (222), PBCHRV2 (223), and PBCHRV3 (224) where each PBCH's
  • scrambling function (240) 4 predefined scrambling codes i.e. first scrambling code, second scrambling code, third scrambling code and fourth scrambling code, may be used for bit-scrambling PBCHRVO (221), PBCHRV1 (222), PBCHRV2 (223), and PBCHRV3 (224) respectively.
  • PBCHRVO, PBCHRV 1 , PBCHRV2, and PBCHRV3 are then modulated such as QPSK
  • the modulation function (240) to produce 4 redundantly or timely modulated PBCHs i.e. PBCHC1RV0 (251), PBCHC2RV1 (252), PBCHC3RV2 (253), and PBCHC4RV3 (254).
  • the SS burst set mapping function (250) the SS burst set periodicity and SS Burst set start parameters are used to drive the mapping function (255) to output appropriate modulated PBCH version ⁇ i.e.
  • PBCHC1RV0 (251), PBCHC2RV1 (252), PBCHC3RV2 (253), or PBCHC4RV3 (254) ⁇
  • the sequence of modulated PBCH versions being output for SSB mapping shall follow the illustrated path (255.5), where the modulated PBCH version corresponding to E.01 i.e. PBCHC1RV0 (251) is output for the 1st 5ms window of a PBCH TTI, followed by modulated PBCH version corresponding to E.02 i.e.
  • PBCHC2RV1 (252), and so on to finish with PBCH version corresponding to E.16 i.e. PBCHC3RV2 (252).
  • PBCH version corresponding to E.16 i.e. PBCHC3RV2 (252).
  • all modulated PBCH versions corresponding to element E.01, E02, E.03, E.15, and E.16 are output at every 5ms intervals within a PBCH TTI of 80ms.
  • the 'SS Burst set start' parameter is firstly used to identify the starting element (i.e.
  • the configured 'SS burst set periodicity' is used for determining element skipping patterns i.e. every second elements for 10ms periodicity, and every fourth elements for 20ms, 40ms, 80ms and 160ms starting from the element corresponding to the SS Burst set start.
  • the modulated PBCHC1RV0 (251) corresponding to element E.01 is output for mapping to the designated SSB within the SS Burst set in the first 5ms window (263) (i.e. first half of radio frame 8k).
  • modulated PBCH version corresponding to every 2nd elements i.e. E.03, E.05, E.07...
  • E.13, E.15 are output at every 10ms intervals (262) for mapping to the designated SSBs within the SS Burst sets in the first 5ms windows of radio frames (8k+l), (8k+2), (8k+3), ..., (8k+7).
  • the alternative method (200b) may comprise 4 predefined scrambling codes (111, 112, 113, and 114) for use in the 1st 20ms window (102) of a PBCH TTI (101), on the first PBCH's redundancy (221), at 5ms granularity; the same 4 predefined scrambling codes for use in the 2nd 20ms window (103) of the PBCH TTI (101), on the second PBCH's redundancy (222), at 5ms granularity; the same 4 predefined scrambling codes for use in the 3rd 20ms window (104) of the PBCH TTI (101), on the third PBCH's redundancy (223), at 5ms granularity; and the same 4 predefined scrambling codes for use in the 1st 20ms window (102) of a PBCH TTI (101), on the first PBCH's redundancy (221), at 5ms granularity; the same 4 predefined scrambling codes for use in the 2
  • a UE upon the detection of a SSB, it may perform at most 16 blind decoding attempts (i.e. 4 PBCH redundancies by 4 scrambling codes) on a PBCH to determine the 80ms timing at half of radio frame (i.e. 5ms) granularity.
  • blind decoding attempts i.e. 4 PBCH redundancies by 4 scrambling codes
  • the introduction of "SS Burst set start" configuration parameter shall allow plurality of TRPs which together form a cloud radio interfaces for wireless connectivity services in a region, to be configured with different "SS Burst set start” values enabling interference management coordination in transmitting minimum system information in the servicing region.
  • the said plurality of TRPs having the same system frame timing and synchronised SFN, and providing wireless connectivity services to plurality of NR-UEs in the region as being discussed in associated with the system illustrated through Fig. 1 , can be exemplarily configured or reconfigured with different "SS Burst set start" values as being illustrated per the timing diagram (270) in Fig. 8.
  • there are 3 TRPs [i.e. TRP(l) (272), TRP(2) (274) and TRP(3) (276)], where:
  • TRP(l) may be configured with 20ms SS burst set periodicity (279) and SS Burst set start is in 1st 5ms window (280) of the PBCH TTI (271);
  • TRP(2) may be configured with 20ms SS burst set periodicity (279) and SS Burst set start in 2nd 5ms window (281) of the PBCH TTI (271); and
  • TRP(3) may be configured with 40ms SS burst set periodicity (283) and SS Burst set start in 3rd 5ms window (282) of the PBCH TTI (271).
  • the transmission of SSBs within a SS Burst set and transmission of the SS Burst sets within a PBCH TTI are described below.
  • a transmitted normal SSB (e.g. 311) in the SS Burst set start (e.g. 310) within a PBCH TTI (e.g. 301) shall at least comprise a PSS (312), a SSSl (313) and the PBCH's 1st
  • the repetition of the said SSB (e.g. 321) in the immediately followed second SS burst set (e.g. 320) within the same PBCH TTI (e.g. 301) shall at least comprise the same PSS (312), a SSS2 (323) and PBCH's redundancy (324).
  • the SSS l and SSS2 are generated from the same value taken from the predefined sets of 1000 possible values.
  • the SSSl and SSS2 transmission are alternated on consecutive SS Burst sets (e.g.
  • the alternations of SSSl and SSS2 transmission shall allow a UE to identify or detect a missed SSB(s) and/or 'SS Burst set periodicity'.
  • a normal SSB is said to be mapped where PSS is mapped on one OFDM symbol, SSSl or SSS2 is mapped on one OFDM symbol, and PBCH or its redundancies is mapped across two OFDM symbols.
  • the scrambling codes selection for use in scrambling the first PBCH and its redundancies shall follow the methods described in the 1 st and 2nd embodiments of the present invention.
  • a UE is allowed to perform the soft combine of the PBCH's 1st transmission (e.g. 314) and one or more PBCH's redundancies (324, 334 and 344) to improve the PBCH decodability.
  • the arrangement of PSS, SSS, and PBCH OFDM symbols within a normal SSB is predefined according to 3GPP RAN-WG1 's agreement, and a predefined arrangement of PSS, SSS, and PBCH OFDM symbols can be down selected from set of [PSS, SSS, PBCH, PBCH] (331.
  • the arrangement of [PSS, PBCH, SSS, PBCH] (331.b) may be selected for mapping a normal SSB to the 1st half of a 14-symbols slot
  • the arrangement of [PBCH, PSS, SSS, PBCH] (33 l .c) may be selected for mapping a normal SSB to the 2nd half of a 14-symbols slot.
  • One or more symbol spacing between detected PSS and SSS may indicate the detected SSB in the 1st half of a 14-symbols slot, where detected PSS and SSS on consecutive symbols may indicate the detected SSB in the 2nd half of a 14-symbols slot.
  • the utilisation of implicit indication of a normal SSB being mapped in in the 1 st or 2nd half of a 14-symbols slot, may result in the same SSB time index being used at a TRP in mapping 2 normal SSBs in one slot of 14-symbols. This enables UE to perform soft combine PBCHs of 2 detected SSBs in the same slot for the PBCH
  • the extended SSB is proposed for use.
  • the proposed extended SSB (e.g. 353) comprises the aforementioned normal SSB (e.g. 358) and additional two OFDM symbols being allocated for the mapping additional PBCH's redundancy (e.g. 357).
  • the SS Burst set start (e.g. 352) within a PBCH TTI (e.g. 351)
  • extended SSB(s) e.g.
  • 353) for transmission shall at least comprise a PSS (354), a SSS1 (355), the PBCH's 1st transmission (356), and one PBCH's redundancy (357), where the repetition of the said extended SSB (e.g. 363) in the immediately followed second SS burst set (e.g. 362) within the same PBCH TTI (e.g. 351) shall at least comprise the same PSS (364), a SSS2 (365) and other two PBCH's redundancies (366 and 367).
  • the selection of scrambling codes for use in scrambling the first PBCH transmission and its redundancies shall follow the methods described in the 1st and 2nd embodiment of the present invention.
  • two PBCH's transmissions being mapped on the same extended SSB may use the same scrambling code where scrambling code selection will follow the methods described in the 1 st embodiment of the present invention.
  • a UE is allowed to perform the soft combine of the PBCH's 1 st transmission (356) and one or more PBCH's redundancies (357, 366 and 367) to improve the PBCH decodability.
  • the extended SSB is also proposed for use.
  • the SS Burst set start (e.g. 372) within a PBCH TTI (e.g. 371)
  • extended SSB(s) e.g. 373 for transmission shall at least comprise a PSS (374), a SSS1 (375), the PBCH's 1 st transmission (376), and one PBCH's redundancy (377).
  • the SS Burst set start is said to repeat in the immediately followed 5ms second window (382), where the repetition of the said extended SSB (e.g.
  • the repeated SS burst set (e.g. 382) within the same PBCH TTI (e.g. 371) shall at least comprise the same PSS (374), the same SSS1 (375) and other remaining two PBCH's redundancies (386 and 387).
  • the same SSS1 (375) being detected the same SSBs in the consecutive SS Burst sets shall allow a UE to differentiate the SS Burst set periodicity of 80ms or larger from the SS Burst set periodicity of 5ms (refer to 517 in Fig. 14 for visual illustration).
  • the selection of scrambling codes for use in scrambling the first PBCH transmission and its redundancies shall be follow the methods described in the 1 st and 2nd embodiment of the present invention.
  • two PBCH's transmissions being mapped on the same extended SSB may use the same scrambling code where scrambling code selection will follow the methods described in the 1 st embodiment of the present invention.
  • a UE is allowed to perform the soft combine of the PBCH's 1st transmission (376) and one or more PBCH's redundancies (377, 386 and 387) to improve the PBCH decodability.
  • the additional 2 symbols being allocated for PBCH's redundancy mapping in an extended SSB can be the 2 OFDM symbols from the end on a normal SSB (e.g. 390a) or the 2 OFDM symbols at the beginning of a normal SSB (e.g. 390b).
  • a normal SSB (392a) is within the first half of a 14-symbol slot or within the even slot of a 7-symbol slot (e.g. 394a)
  • the first 2 symbols of the 14-symbol slot's second half or the first 2 symbols of the odd slot of the associated 7-symbol slot (395 a) are reserved for a PBCH's redundancy mapping.
  • This mapping further mandates one OFDM symbol (i.e. symbol #2 - 396a) for DL transmission and leave three symbols (i.e. symbols #2, 3, and 4 - 397a) for flexible DL/UL configuration i.e. being used for DL transmission or UL transmission and as guard period;
  • a normal SSB (392b) is within the second half of a 14-symbol slot or within the odd slot of a 7-symbol slot (e.g. 394b)
  • the last 2 symbols the 14-symbol slot's first half or the last 2 symbols of the even slot of the associated 7-symbol slot (395b) are reserved for PBCH's redundancy mapping.
  • This mapping further mandates three OFDM symbols (i.e. symbol #2, 3 and 4 - 396b) for DL transmission and leave one symbol (i.e. symbols # 4 - 397b) for flexible configuration i.e. being used for DL transmission or UL transmission and as guard period.
  • option 390a may appear more advantageous than option 390b and it is proposed as preferred option for
  • a UE may firstly attempt to detect a normal SSB and monitor the presence of PBCH's DMRS on the additional 2 symbols being allocated for PBCH's redundancy in the case that extended SSB is used.
  • the final embodiment of the present invention is the method for indicating SSBs within a SS Burst set which shall enable the versatile and flexibility in scheduling and mapping SSBs within a periodic SS Burst set without introducing significant (implicit and explicit) signalling overhead where implicit signalling may require UE to perform additional blind detection/decoding.
  • 3 GPP RAN-WG1 has - identified that the contents in a NR-MIB (i.e. minimum system information) may include timing information within a radio frame having [0-7] bits for information such as SSB time index [0-6] bits (i.e.
  • the method where the SSB locations/positions has to be predefined up front for use shall further restrict a gNB in scheduling the transmission of SS Burst sets among TPRs which form radio interface cloud for wireless connectivity services, and therefore there is a needs for new method in indicating SSBs within a periodic SS Burst set which shall enable a gNB to configure its TRPs to schedule and map a SSB to any possible position being available for use within a periodic SS burst set.
  • the method comprises:
  • a 5ms burst set window e.g. 401 into 5 consecutive lms-intervals i.e. the 1st Ims-interval (402), the 2nd Ims-interval (403), the 3rd Ims-interval (404), the 4th Ims-interval (405) and the 5th Ims-interval (406).
  • 3 bits may be used to explicitly indicate which Ims-interval (i.e. 1 st, 2nd, 3rd, 4th, or 5th) that a SSB is transmitted and received.
  • the 3 bits indicating the 1ms window that a SSB belong to may be represented implicitly through PBCH DMRS sequence designs i.e. there may be 5 differentiable DMRS sequences forming a periodic sequence of 5ms in length where each is allocated for use on PBCHs in a 1ms window.
  • '000' for indicating a SSB in the 1st Ims-interval (402); '001 ' for indicating a SSB in the 2nd Ims-interval (403); '010' indicating a SSB in for the 3rd Ims-interval (404); 'Oi l ' for indicating a SSB in the 4th Ims-interval (405); and ' 100' for indicating a SSB in the 5th
  • NR-MIB minimum system information i.e. NR-MIB
  • there may be 2" slots in a Ims-interval e.g. 1 slot, 2 slots, 4 slots, 8 slots or 16 slots.
  • a slot may comprise 14 OFDM symbols. Slots within a
  • additional 4 bits may be used explicitly indicate which slot number in an interval of 1ms that a SSB is transmitted and received; 3.
  • SSB in the first half of a 14-symbol slot (410) and SSB in the second half of a 14-symbol (411) can be implicitly indicated using two differentiable PSS and SSS mapping arrangements. Otherwise, one more bit can be used as explicit signalling.
  • successful detecting the PSS and associated SSS of a SSB indicates (implicitly) whether the detected SSB is in the first half or second half of a slot.
  • Full or partial 7 bits being retrieved from the decoding of the PBCH further indicates (explicitly) the SSB time index, where the 3 bits (e.g. 3 MSB) may indicate which lms-interval that a detected SSB belongs to, and 4 bits (e.g. 4 LSB) may indicate which slot number in the said lms-interval that the SSB is received.
  • the method of using 7-bits to explicitly or hybrid i.e.
  • a gNB allows a gNB to configure its TRP to map a SSB in any possible candidate positions within a SS burst set interval.
  • a transmitting SSBs pattern in a periodic SS burst set may uniquely appear distributed (e.g. TRP#0 - 420 and TRP#1 - 430), localised (e.g. TRP#2 - 440), or combination of distributed and localised (e.g. TRP#3 - 450 and TRP#4 - 460).
  • TRP#0 - 420 and TRP#1 - 430 may uniquely appear distributed (e.g. TRP#0 - 420 and TRP#1 - 430), localised (e.g. TRP#2 - 440), or combination of distributed and localised (e.g. TRP#3 - 450 and TRP#4 - 460).
  • TRP#0, TRP#1, TRP#2, TRP#3 and TRP#4 which form an radio interface cloud, to share the same SS Bust set(s) in transmitting time-multiplexed beam-formed SSBs at a gNB like the example 400, shall further enable a UE in a window of 5ms to acquire minimum system information and possible servicing beams at its location/position from its surrounding servicing TRPs.
  • the gNB can configure/reconfigure one or more its TRPs, on PBCH TTI basis, to change their SS burst set periodicity to facilitate fast network access or to reduce/eliminate system information overhead and save power as being exemplarily illustrated in Fig. 14 and Fig. 15.
  • a gNB may reconfigure its TRP to change SS Burst set periodicity at the beginning of a new PBCH TTI, while keeping the same 'SS Burst set start' (503) i.e. 1st 5ms window is selected as anchored SS burst set window.
  • the currently configured SS burst set periodicity may be 5ms (510) and SS Burst set start in the first 5ms window (503).
  • a gNB may reconfigure the TRP to change from 5ms SS Burst set periodicity ( 10) to other SS Burst set periodicity value which is different from 5, e.g.
  • 10ms SS Burst set periodicity (511), 20ms SS Burst set periodicity (512), 40ms SS Burst set periodicity (513), 80 or 160ms SS Burst set periodicity (514).
  • the change in periodicity may be detected through the change in SSSx (e.g. 515 for 10ms as new SS Burst set periodicity and 516 for 20ms as new SS Burst set periodicity);
  • a gNB may reconfigure its TRP to change SS Burst set periodicity at the beginning of a new PBCH TTI, and also changing 'SS Burst set start' where the 2nd, 3rd, or 4th 5ms window may be selected as anchored SS burst set window.
  • the currently configured SS burst set periodicity may be 5ms (540) and SS Burst set start in the first 5ms window which certainly having an SS Burst set in the anchored SS burst set window.
  • a gNB may reconfigure the TRP to change from 5ms SS Burst set periodicity (540) to 10ms SS Burst set periodicity (541) with the new SS Burst set start in the second 5ms window which certainly having an SS Burst set in the anchored SS burst set window.
  • a gNB may reconfigure the TRP to change from 5ms SS Burst set periodicity (540) to 20ms SS Burst set periodicity (542) with the new SS Burst set start in the 4th 5ms window (533) which is the anchored SS burst set window.
  • a gNB may optionally indicate 'anchored SS burst set' to assist a UE using 2-bits signalling to assist the detection of SS Burst set periodicity reconfiguration.
  • Extended SSB and extended SSB formats as well as the method of use in transmitting & receiving SSBs for 40ms, 80ms and 160ms SS burst set periodicities;
  • Scramming codes set generation and use in transmitting SSBs for 5ms, 10ms, 20ms, 40ms, 80ms, and 160ms SS burst set periodicities, and that results at reduction in number of blind decoding attempts to be done at a UE hence to optimise processing power at a UE.
  • a gNB may configure its associated TRPs to operate on the same carrier frequency, share the same carrier/operational bandwidth, and have time-synchronised in establishing a cloud radio interface providing beam-formed wireless connectivity services to multiple UEs.
  • the method for use in a multi-beam environment includes the following important features:
  • 'SS Burst set start' configuration parameter for use at a gNB in configuring or reconfiguring its associated TRPs for transmitting minimum system information.
  • the gNB may configure or reconfigured the TRPs with different SS Burst set starts to enable inter TRPs interference coordination in broadcasting beam-formed minimum system information at 5ms granularity;
  • the configured 'anchored SS Burst set' for a TRP indicates the window of 5ms within a PBCH TTI or paired PBCH TTI and within that window there is always a SS burst set for mapping and transmission regardless of the configured or reconfigured SS burst set periodicity.
  • the gNB may use 2-bits for explicit indication of 'anchored SS Burst set' configuration to a UE;
  • the 3 -bits among the said 7-bits may be used to indicate implicitly or explicitly whether a SSB is within the 1st, 2nd, 3rd, 4th or 5th 1ms interval of a 5ms burst set interval, and the remaining 4-bits may be used to indicate explicitly the slot index (i.e. 0, 1, .. 15) within the 1ms interval that a SSB belongs to;
  • the first SSB format and second SSB format are differentiable by the distinguishable mapping of PSS and SSS within a SSB i.e. consecutive PSS and SSS mapping vs separated or spacing PSS and SSS mapping, (note: normal SSB is the current 3GPP endorsed structure that has 1 PSS OFDM symbol, 1 SSS OFDM symbol and 2 PBCH OFDM symbols);
  • extended SS Block for use with SS burst set periodicity of 40ms, 80ms and 160ms.
  • the proposed extended SSB comprise the normal SSB and additional two OFDM symbols in the same 14-symbols slot for the mapping one PBCH redundancy or time version. This may allow an extended SSB to carry two time varying PBCH redundancies.
  • Method of transmitting extended SSBs for use with SS burst set periodicity of 80ms and 160ms When SS burst set periodicity of 80ms or 160ms, is configured or reconfigured for SSBs transmission, there is only one scheduled SS burst set per PBCH TTI or per paired PBCH TTIs. There proposes the scheduled SS burst set is retransmitted in the immediately followed window of 5ms. Where the first extended SSB format may be used for mapping of extended SSB in the scheduled SS burst set, and the second extended SSB format may be used for mapping of extended SSB in the retransmitted SS burst set or via versa;
  • SS Burst set level where SSS1 may be used in every SSBs within the first burst set of a PBCH TTI to assist the missed detected SSBs at SS Burst set level or implicit indication of SS Burst set periodicity.
  • SSS1 may be used in every SSBs within the scheduled and retransmitted SS burst sets;
  • a UE may perform at most 12 blind decoding attempts on a PBCH to determine the 80ms timing at 5ms granularity when 5ms SS burst set periodicity is configured for SSB transmission.
  • a UE may perform at most 4 blind decoding attempts on a PBCH to determine the 80ms timing at 5ms granularity;
  • the 4 predefined scrambling codes may be used for scrambling all four redundancy versions of a PBCH in generating 16 scrambled PBCH redundancy versions (i.e. 4 scrambling codes by 4 redundancies) where each scrambled PBCH redundancy version is associated with the 5ms window within a 80ms PBCH TTI of 5ms.
  • This method may require a UE to perform at most 16 blind decoding attempts on a PBCH to determine the 80ms timing at 5ms granularity regardless SS Bust set periodicity.
  • first and second SSB formats for use in mapping normal SSB to a 14-symbol slot enables 2 SSBs being mapped to the same slot having their PBCH carrying the same payload for soft-combine at a UE;
  • SSS1 and SSS2 enable the missing SSB detection and SS burst set periodicity detection
  • the method of generating scrambling codes set helps the reduction of number of blind decoding attempts to be done at a UE.
  • a method for use in a scalable New Radio (NR) system that comprises at least one logical access node (gNB) and a plurality of associated transmission reception points (TRPs) forming virtual radio interface cloud that provides beam formed wireless connectivity services to a plurality of new radio-user equipments (NR-UEs), the method comprising the steps of:
  • the gNB determines a number of beams and beam's configuration to be serviced at each and every associated TRP to achieve desirable radio cloud coverage
  • SS Burst set periodicity SS Burst set start, and/or anchored SS Burst set;
  • the gNB further configuring the associated TRPs, that can have the same configured SS Burst set start or anchored SS Burst set, with non-overlapping SS Blocks (SSBs) mapping patterns;
  • SSBs SS Blocks
  • a SSB can at least comprise PSS, SSSX and PBCH or PBCHs; and at a NR-UE in a local radio interface cloud, performing SSBs detection and associated PBCHs decoding to identify at least available beams for wireless connectivity services at its location, slot boundary, Virtual Cell's identities (IDs) or Virtual cloud radio interface IDs, orthogonal frequency-division multiplexing (OFDM) symbol index, slot index in a radio frame, radio frame number and/or any other minimum system information.
  • PBCH physical broadcast channel
  • TTI transmission time interval
  • the SS Burst set start value indicates whether the first SS Burst set in a PBCH TTI starts in the 1st, 2nd, 3rd or 4th window of 5ms within the PBCH TTI; or the 1st half of the first radio frame within the PBCH TTI, 2nd half of the first radio frame within the PBCH TTI, 1 st half of the second radio frame within the PBCH TTI, or 2nd half of the second radio frame within the PBCH TTI.
  • a configured SS Burst set start has a default value indicating that the first SS Burst set in a PBCH TTI starts in the 1st 5ms- window of the PBCH TTI or the 1st half of the first radio frame with the PBCH TTI.
  • the plurality of TRPs are configured to: operate on the same carrier frequency, share the same carrier/operational bandwidth, and have a synchronised SFN; and/or are further configured or reconfigured with different SS Burst set starts to enable inter TRPs interference coordination in broadcasting beam-formed minimum system information at 5ms granularity.
  • a configured anchored SS Burst set value indicates whether the anchored SS Burst set occurs in the 1st , 2nd , 3rd or 4th window of 5ms in a PBCH TTI.
  • a configured anchored SS Burst set of a TRP has the same value as the value of the initially configured SS Burst set start or the corresponded SS Burst set start resulting from reconfiguration of SS Burst set periodicity of that TRP.
  • a TRP is configured or reconfigured with the SS Burst set periodicity of 20ms or less for periodic SS Burst set transmission, and the TRP transmits at most 2 normal SSBs per 14-symbols slot using normal SSB formats.
  • a first normal SSB format for mapping a normal SSB in the first half of a 14-symbol slot and a second normal SSB format for mapping a normal SSB in the second half of a 14-symbol slot are predefined for common use with subcarrier spacing (SCS) including 15kHz, 30kHz, 60kHz and 120kHz.
  • SCS subcarrier spacing
  • a first extended SSB format comprises a first normal SSB format with additional 2 OFDM symbols and preferably the first 2 OFDM symbols in the second half of the same 14-symbol slot being reserved for the mapping of a PBCH's retransmission or time version
  • a second extended SSB format comprises the second normal SSB format with additional 2 OFDM symbols and preferably the last 2 OFDM symbols in the first half of the same 14-symbol slot being reserved for the mapping of a PBCH's retransmission or time version.
  • a TRP is configured or reconfigured with SS Burst set periodicity of 80ms or larger for periodic SS Burst set transmission within a PBCH TTI of 80ms, the TRP transmitting only one scheduled SS Burst set in a window indicated by the configured SS Burst set start, and further retransmits that SS Burst set in the immediately followed window of 5ms.
  • a TRP uses the first extended SSB format for mapping and transmitting extended SSBs within the scheduled SS Burst set, and uses the second extended SSB format for mapping and transmitting extended SSBs within the retransmitted SS Burst set.
  • non-overlapping SSBs pattern allowing a plurality of TRPs to share one or more 5ms window within a PBCH TTI in transmitting their beam-formed SSBs, is said to enable inter TRPs interference coordination in broadcasting beam formed minimum system information at SSB granularity.
  • each indexed element in the said sequence points to the scrambling code and the corresponding PBCH redundancy or time version for use in transmitting PBCHs in the corresponding window of 5ms within a PBCH TTI.
  • Supplementary note 30 The method of Supplementary note 30, except the case of 5ms burst set periodicity configuration, wherein a UE performs at most 4 blind decoding attempts on a PBCH and further uses detected SSSX to determine the 80ms timing at 5ms granularity.
  • PBCH being scrambled with the first, second, third and fourth predefined scrambling codes is for the third 20ms window of a PBCH TTI at 5ms window granularity.

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

Abstract

La présente invention concerne un procédé destiné à être utilisé dans un système NR extensible. Le procédé consiste, au niveau des gNB, à déterminer un certain nombre de faisceaux et la configuration de faisceau à desservir à chaque TRP associé. Au niveau des gNB, les TRP associés sont configurés avec une périodicité d'ensemble de rafales SS, un début d'ensemble de rafales SS et/ou un ensemble de rafales SS ancré. Au niveau de chaque gNB, les TRP associés qui peuvent avoir le même début d'ensemble de rafales SS configuré ou le même ensemble de rafales SS ancré, sont configurés avec des motifs de mappage SSB non chevauchants. Au niveau d'un TRP configuré, dans une fenêtre d'ensemble de rafales SS programmée périodiquement à l'intérieur d'un TTI de PBCH, le procédé consiste à émettre des SSB formés par faisceau à la suite des motifs de mappage SSB déterminés. Au niveau d'un NR-UE dans un nuage d'interface radio local, le procédé consiste à réaliser une détection de SSB et un décodage de PBCH associé pour identifier au moins des faisceaux disponibles pour des services de connectivité sans fil.
PCT/JP2018/004502 2017-07-20 2018-02-02 Système et procédés destinés à être utilisés dans l'émission et la réception d'informations système dans une communication sans fil avancée WO2019016987A1 (fr)

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CN111817823B (zh) * 2020-09-14 2020-12-01 翱捷科技股份有限公司 一种pbch的接收方法及系统
CN111817823A (zh) * 2020-09-14 2020-10-23 翱捷科技股份有限公司 一种pbch的接收方法及系统
WO2023135576A1 (fr) * 2022-01-14 2023-07-20 Lenovo (Singapore) Pte. Ltd. Communication basée sur une configuration de rafale ssb
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