WO2018143702A1 - Appareil et procédé de gestion de faisceau dans des systèmes de communication sans fil - Google Patents

Appareil et procédé de gestion de faisceau dans des systèmes de communication sans fil Download PDF

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WO2018143702A1
WO2018143702A1 PCT/KR2018/001402 KR2018001402W WO2018143702A1 WO 2018143702 A1 WO2018143702 A1 WO 2018143702A1 KR 2018001402 W KR2018001402 W KR 2018001402W WO 2018143702 A1 WO2018143702 A1 WO 2018143702A1
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Prior art keywords
signaling
pdsch
csi
pdcch
mac
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PCT/KR2018/001402
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English (en)
Inventor
Boon Loong Ng
Jaewon Kim
Vikram Chandrasekhar
Young-Han Nam
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Samsung Electronics Co., Ltd.
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Priority claimed from US15/877,185 external-priority patent/US10148337B2/en
Application filed by Samsung Electronics Co., Ltd. filed Critical Samsung Electronics Co., Ltd.
Priority to EP18747876.3A priority Critical patent/EP3574607A4/fr
Priority to CN201880009710.7A priority patent/CN110249573A/zh
Publication of WO2018143702A1 publication Critical patent/WO2018143702A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • 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
    • 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
    • H04L5/0053—Allocation of signaling, 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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space

Definitions

  • the present application relates generally to beam management in wireless communication systems. More specifically, this disclosure relates to beam management of downlink data and control channel for 5G next radio.
  • the 5G or pre-5G communication system is also called a 'Beyond 4G Network' or a 'Post LTE System'.
  • the 5G communication system is considered to be implemented in higher frequency (mmWave) bands, e.g., 60GHz bands, so as to accomplish higher data rates.
  • mmWave e.g., 60GHz bands
  • MIMO massive multiple-input multiple-output
  • FD-MIMO Full Dimensional MIMO
  • array antenna an analog beam forming, large scale antenna techniques are discussed in 5G communication systems.
  • RANs Cloud Radio Access Networks
  • D2D device-to-device
  • wireless backhaul moving network
  • cooperative communication Coordinated Multi-Points (CoMP), reception-end interference cancellation and the like.
  • CoMP Coordinated Multi-Points
  • 5th generation (5G) mobile communications initial commercialization of which is expected around 2020, is recently gathering increased momentum with all the worldwide technical activities on the various candidate technologies from industry and academia.
  • the candidate enablers for the 5G mobile communications include massive antenna technologies, from legacy cellular frequency bands up to high frequencies, to provide beamforming gain and support increased capacity, new waveform (e.g., a new radio access technology (RAT)) to flexibly accommodate various services/applications with different requirements, new multiple access schemes to support massive connections, and so on.
  • RAT new radio access technology
  • the International Telecommunication Union (ITU) has categorized the usage scenarios for international mobile telecommunications (IMT) for 2020 and beyond into 3 main groups such as enhanced mobile broadband, massive machine type communications (MTC), and ultra-reliable and low latency communications.
  • the ITC has specified target requirements such as peak data rates of 20 gigabit per second (Gb/s), user experienced data rates of 100 megabit per second (Mb/s), a spectrum efficiency improvement of 3X, support for up to 500 kilometer per hour (km/h) mobility, 1 millisecond (ms) latency, a connection density of 106 devices/km2, a network energy efficiency improvement of 100X and an area traffic capacity of 10 Mb/s/m2. While all the requirements need not be met simultaneously, the design of 5G networks may provide flexibility to support various applications meeting part of the above requirements on a use case basis.
  • the present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates beyond 4th-Generation (4G) communication system such as long term evolution (LTE).
  • 5G pre-5th-Generation
  • 4G 4th-Generation
  • Embodiments of the present disclosure provide multiple services in advanced communication systems.
  • a user equipment (UE) for beam management in a wireless communication system comprises a transceiver configured to receive, from a base station (BS), a radio resource control (RRC) signaling and a medium access control channel element (MAC CE) signaling including a beam indicator over a downlink channel for the beam management, and a processor configured to identify the beam indicator based on the RRC signaling and the MAC CE signaling and determine the beam indicator for a physical downlink control channel (PDCCH), a common physical downlink shared channel (PDSCH), and a fallback unicast PDSCH.
  • BS base station
  • RRC radio resource control
  • MAC CE medium access control channel element
  • a base station (BS) for beam management in a wireless communication system comprises a processor configured to determine a beam indicator for a physical downlink control channel (PDCCH), a common physical downlink shared channel (PDSCH), and a fallback unicast PDSCH and configure the beam indicator based on a radio resource control (RRC) signaling and a medium access control channel element (MAC CE) signaling.
  • the BS further comprises a transceiver configured to transmit, to a user equipment (UE), the RRC signaling and the MAC CE signaling including the beam indicator over a downlink channel for the beam management.
  • UE user equipment
  • a method of a user equipment (UE) for beam management in a wireless communication system comprises receiving, from a base station (BS), a radio resource control (RRC) signaling and a medium access control channel element (MAC CE) signaling including a beam indicator over a downlink channel for the beam management, identifying the beam indicator based on the RRC signaling and the MAC CE signaling, and determining the beam indicator for a physical downlink control channel (PDCCH), a common physical downlink shared channel (PDSCH), and a fallback unicast PDSCH.
  • BS base station
  • RRC radio resource control
  • MAC CE medium access control channel element
  • FIGURE 1 illustrates an example wireless network according to embodiments of the present disclosure
  • FIGURE 2 illustrates an example gNB according to embodiments of the present disclosure
  • FIGURE 3 illustrates an example UE according to embodiments of the present disclosure
  • FIGURE 4A illustrates an example high-level diagram of an orthogonal frequency division multiple access transmit path according to embodiments of the present disclosure
  • FIGURE 4B illustrates an example high-level diagram of an orthogonal frequency division multiple access receive path according to embodiments of the present disclosure
  • FIGURE 5 illustrates an example network slicing according to embodiments of the present disclosure
  • FIGURE 6 illustrates an example hybrid beam forming structure according to embodiments of the present disclosure
  • FIGURE 7 illustrates an example UE procedure for determining the Rx beam to receive common PDSCH according to embodiments of the present disclosure
  • FIGURE 8 illustrates an example UE procedure for determining the time/frequency resource to receive common PDSCH according to embodiments of the present disclosure
  • FIGURE 9 illustrates an example determination of time window to search for common PDSCH given the preferred Tx beam according to embodiments of the present disclosure
  • FIGURE 10 illustrates an example random access procedure to inform the network UE's change in preferred Tx beam according to embodiments of the present disclosure
  • FIGURE 11 illustrates an example UE procedure for receiving unicast fallback PDSCH and non-fallback PDSCH according to embodiments of the present disclosure
  • FIGURE 12 illustrates an example procedure for RS according to embodiments of the present disclosure
  • FIGURE 13 illustrates an example UE procedure for determining the Rx beam to receive UE-common PDCCH according to embodiments of the present disclosure
  • FIGURE 14 illustrates an example UE procedure for determining the time/frequency resource to receive UE-common PDCCH according to embodiments of the present disclosure
  • FIGURE 15 illustrates an example UE procedure for receiving UE-specific fallback PDCCH and non-fallback UE-specific PDCCH according to embodiments of the present disclosure
  • FIGURE 16 illustrates an example UE procedure of determining beams for receiving common PDSCHs according to embodiments of the present disclosure
  • FIGURE 17 illustrates an example UE procedure for determining the control signaling method depending on the PDSCH type according to embodiments of the present disclosure
  • FIGURE 18 illustrates an example UE procedure for determining the PDSCH type associated with the beam indication signaling according to embodiments of the present disclosure
  • FIGURE 19 illustrates an example UE procedure for determining the control signaling scheme depending on the unicast PDSCH type according to embodiments of the present disclosure
  • FIGURE 20 illustrates an example MAC-CE signaling to update QCL reference according to embodiments of the present disclosure
  • FIGURE 21 illustrates an example RRC, MAC-CE, and DCI according to embodiments of the present disclosure
  • FIGURE 22 illustrates an example QCL reference and CSI-RS according to embodiments of the present disclosure
  • FIGURE 23 illustrates an example QCL association between beam management RS according to embodiments of the present disclosure
  • FIGURE 24 illustrates an example UE procedure of determining beams for receiving common PDCCHs according to embodiments of the present disclosure
  • FIGURE 25 illustrates an example UE procedure for determining the control signaling method depending on the PDCCH type according to embodiments of the present disclosure
  • FIGURE 26 illustrates an example UE procedure for determining the PDCCH type associated with the beam indication signaling according to embodiments of the present disclosure
  • FIGURE 28 illustrates an example reporting setting activation procedure according to embodiments of the present disclosure
  • FIGURE 29 illustrates an example reporting setting activation/deactivation procedure according to embodiments of the present disclosure
  • the value of the N variable may be any integer number (i.e., 1, 4, 3, 4, etc.), while for FFT and IFFT functions, the value of the N variable may be any integer number that is a power of two (i.e., 1, 2, 4, 8, 16, etc.).
  • CSI refers to at least one of CQI, PMI, RI, RSRP and a CSI-related resource index (e.g., beam index, CSI-RS resource index).
  • BSI refers to at least one of: (1) beam index that can be derived from CSI-RS port index, beam resource index/time unit index and B-CSI-RS resource index; or (2) RSRP and/or RSRQ of the reported beam.
  • a Tx beam may refer to a QCL resource of an RS resource, wherein the RS resource can be BRS or CSI-RS.
  • Tx beams of an RS resource or an RS setting can be indexed with unique IDs, referred to Tx beam IDs. For example, if N Tx beams are available in an RS resource or an RS setting, N unique IDs can be allocated to these N individual Tx beams.
  • an Rx beam ID refers to an index that can be commonly understood by UE and gNB, for UE's Rx beamforming operation.
  • a UE can be equipped with a single or multiple digital Rx chains.
  • Rx-beam, Rx mode and Rx-beam related QCL parameters are used interchangeably, and refer to average AOA, ASD or antenna correlations.
  • an Rx beam of a first QCL resource can be inferred by that of a second QCL resource
  • the first and the second QCL resources are said QCL'ed in Rx-beam/Rx mode.
  • a set of QCL parameters refers to a combination of Rx-beam related parameters (average angle of arrival, arrival angle spread, Rx antenna correlation, etc.), delay and timing related parameters (Rx timing, delay spread, average delay), Doppler related parameters (average Doppler, Doppler spread), etc.
  • the RS used for beam measurement by the UE may be based on a cell-specific RS, which can be one or more of NR-SSS, mobility RS (MRS), BRS or cell-specific CSI-RS. Other types of cell-specific RS are also possible. Based on the measurement of a set of cell-specific RSs, the UE can determine the best or preferred Tx beam and Rx beam (if multiple Rx beams can be employed by the UE) to receive the common PDSCH.
  • FIGURE 8 illustrates an example UE procedure 800 for determining the time/frequency resource to receive common PDSCH according to embodiments of the present disclosure.
  • An embodiment of the UE procedure 800 shown in FIGURE 8 is for illustration only.
  • One or more of the components illustrated in FIGURE 8 can be implemented in specialized circuitry configured to perform the noted functions or one or more of the components can be implemented by one or more processors executing instructions to perform the noted functions.
  • Other embodiments are used without departing from the scope of the present disclosure.
  • the time-frequency resource for receiving common PDSCH can depend on the best/preferred Tx beam or cell-specific RS determined by the UE.
  • the mapping of the Tx beam to the time-frequency resource can be predefined in the standards specifications, or informed by the network in a broadcast message such as in a PBCH.
  • FIGURE 9 illustrates an example determination of time window 900 to search for common PDSCH given the preferred Tx beam according to embodiments of the present disclosure.
  • An embodiment of the determination of time window 900 shown in FIGURE 9 is for illustration only.
  • One or more of the components illustrated in FIGURE 9 (a) can be implemented in specialized circuitry configured to perform the noted functions or one or more of the components can be implemented by one or more processors executing instructions to perform the noted functions. Other embodiments are used without departing from the scope of the present disclosure.
  • the time and/or frequency windows for the different beams can be interleaved in time and/or frequency domain. This can minimize the average delay for the UE to receive the common PDSCH messages.
  • FIGURE 9 (b) the configuration can include the sub-window duration and the interleaving factor (which determines the number of sub-windows). It is noted that if the common PDSCH is scheduled by a DCI in a PDCCH, the time-frequency window can define the window for the UE to monitor the UE-common PDCCH, the common PDSCH resource is then determined by the UE-common PDCCH content.
  • the UE can be beneficial for the UE to inform the network the UE's preferred Tx beam has changed.
  • the knowledge of UE's preferred Tx beam at the TRP allows the network to schedule the UE to the appropriate UE-group common PDSCH in the case there can be multiple UE-group common PDSCHs, where each UE-group common PDSCH targets different set of UEs. If the UE-group common PDSCH can be scheduled to idle mode UEs, there is a need to specify a procedure that can be applied to idle mode.
  • the random access procedure can be used to indicate the change in the preferred Tx beam for the UE.
  • Two example procedures are illustrated in FIGURE 10.
  • the procedure illustrated in FIGURE 10(a) assumes the PRACH resource location implicitly indicates the identity of the preferred Tx beam.
  • the PRACH resource and mapping to Tx beam can be predefined or can be configured by the higher layer.
  • the procedure illustrated in FIGURE 10(b) makes no assumption of mapping between the PRACH resource and the Tx beam identity.
  • the UE needs to include the indication of its preferred Tx beam in an UL data transmission after reception of the RAR. If the UE was in idle mode before the random access procedure, the UE can remain in the idle mode.
  • the aforementioned procedures can be extended to the deployment scenarios where there can be multiple TRPs transmitting multiple common PDSCHs that need to be received by the UE, or there can be multiple Tx beams from a single TRP, transmitting multiple common PDSCHs that need to be received by the UE.
  • the UE would maintain at least one best/preferred Tx beam from each TRP or each beam of a TRP, and determine the appropriate Rx beam and common PDSCH resources to receive for each TRP or each beam of a TRP.
  • the Tx beam used for transmission can correspond to a 1 st type of RS; whereas for the non-fallback unicast PDSCH, the TX beam used for transmission can correspond to a 2 nd type of RS.
  • the 1 st type of RS can correspond to a cell-specific RS (e.g. NR-SSS, MRS, BRS, cell-specific CSI-RS) or a 1 st kind of UE-specific RS (e.g. UE-specific CSI-RS).
  • the 2 nd type of RS can correspond to a UE-specific RS (e.g.
  • the UE determines if the unicast PDSCH to be received is a fallback PDSCH or not in order to implement the procedure as illustrated in FIGURE 11.
  • the following are some examples.
  • the unicast PDSCH is scheduled with a 1 st type of DCI format
  • the unicast PDSCH is a fallback PDSCH; else if the unicast PDSCH is scheduled with a 2 nd type of DCI format, the unicast PDSCH is a non-fallback PDSCH.
  • the type of DCI format can be distinguished through the size of the DCI format, or through a flag in the DCI format.
  • the unicast PDSCH is scheduled with a PDCCH detected/received in a 1 st PDCCH search space (e.g. common PDCCH search space, or UE-group common PDCCH search space)
  • the unicast PDSCH is a fallback PDSCH; else if the unicast PDSCH is scheduled with a PDCCH detected/received in a 2 nd PDCCH search space (e.g. UE-specific PDCCH search space), the unicast PDSCH is a non-fallback PDSCH.
  • the unicast PDSCH is scheduled with a PDCCH detected/received with the 1 st type of RS as the reference QCL; else if the unicast PDSCH is scheduled with a PDCCH detected/received with the 2 nd type of RS as the reference QCL, the unicast PDSCH is a non-fallback PDSCH.
  • the unicast PDSCH is multiplexed in the same (or overlapping) time domain resources as that for the PDCCH detected/received with the 1 st type of RS as the reference QCL; else if the unicast PDSCH is multiplexed in the same (or overlapping) time domain resources as that for a PDCCH detected/received with the 2 nd type of RS as the reference QCL, the unicast PDSCH is a non-fallback PDSCH.
  • the unicast PDSCH is a fallback PDSCH; else if DCI format scheduling the unicast PDSCH indicates the 2 nd type of RS as the reference QCL for PDSCH reception, the unicast PDSCH is a non-fallback PDSCH.
  • a bit field can be used to indicate the RS type.
  • the RS type can also be indicated through unique RS index assignment for both types of RS (for example, RS id 1 to N can be used to indicate the 1 st type while RS id N+1 to N+M can be used to indicate the 2 nd type).
  • the downlink control channel and the downlink data channel generally have different requirement on their link performances.
  • the downlink control channel requires high reliability and does not require high data rate.
  • the downlink data channel can target high data rate and can utilize retransmission mechanism to increase reliability.
  • configuration of different beams used for control channel and data channel may be supported.
  • the beams used for downlink control channel can have wider beam width (compared to that for downlink data channel) so that the beams are robust with respect to UE mobility and signal blockage.
  • narrower beams can be used to deliver high beamforming gain so that higher data rate can be supported.
  • the downlink control channel can use a single port or a transmission diversity scheme
  • the downlink data channel can use multi-layer MIMO or multi-point transmissions, e.g., non-coherent joint transmission (JT).
  • JT non-coherent joint transmission
  • Different transmission schemes may require different set of TRP Tx beams.
  • downlink control channels can be divided into UE-common (or UE-group common) downlink control channel and UE-specific downlink control channel. Since UE-common downlink control channel targets multiple UEs, while UE-specific downlink control channel targets only a single UE, it would be beneficial to employ different beams for UE-common downlink control channel and UE-specific downlink control channel, implying different beam management procedures for UE-common and UE-specific downlink control channels.
  • the network may need to transmit UE-common downlink control channels on all the network's Tx beams in the same way as NR synchronization signals and NR PBCH.
  • the RS used for beam measurement by the UE may be based on a cell-specific RS, which can be one or more of NR-SSS, mobility RS (MRS), BRS or cell-specific CSI-RS. Other types of cell-specific RS are also possible.
  • the UE Based on the measurement of a set of cell-specific RSs, the UE can determine the best or preferred Tx beam and Rx beam (if multiple Rx beams can be employed by the UE) to receive the UE-common PDCCH.
  • FIGURE 13 illustrates an example UE procedure 1300 for determining the Rx beam to receive UE-common PDCCH according to embodiments of the present disclosure.
  • An embodiment of the UE procedure 1300 shown in FIGURE 13 is for illustration only.
  • One or more of the components illustrated in FIGURE 13 can be implemented in specialized circuitry configured to perform the noted functions or one or more of the components can be implemented by one or more processors executing instructions to perform the noted functions.
  • Other embodiments are used without departing from the scope of the present disclosure.
  • FIGURE 14 illustrates an example UE procedure 1400 for determining the time/frequency resource to receive UE-common PDCCH according to embodiments of the present disclosure.
  • An embodiment of the UE procedure 1400 shown in FIGURE 14 is for illustration only.
  • One or more of the components illustrated in FIGURE 14 can be implemented in specialized circuitry configured to perform the noted functions or one or more of the components can be implemented by one or more processors executing instructions to perform the noted functions. Other embodiments are used without departing from the scope of the present disclosure.
  • the UE procedures as described in FIGURE 13 and FIGURE 14 can be the same as those described in FIGURE 7 and FIGURE 8, i.e. the same procedure is used by the UE to determine the Rx beam and the time/frequency resource to receive UE-common PDCCH and common PDSCH.
  • the time-frequency resource for receiving UE-common PDCCH can depend on the best/preferred Tx beam or cell-specific RS determined by the UE.
  • the mapping of the Tx beam to the time-frequency resource can be predefined in the standards specifications, or informed by the network in a broadcast message such as in a PBCH.
  • the methods as described for the common PDSCH and as illustrated in FIGURE 14 can be applied to UE-common PDCCH in the sense that the UE is only required to search for the UE-common PDCCH search space in the configured time and/or frequency windows or sub-windows, corresponding to the best/preferred Tx beam.
  • the above procedures can be extended to the deployment scenarios where there can be multiple TRPs transmitting multiple UE-common PDCCHs that need to be received by the UE, or there can be multiple Tx beams from a single TRP, transmitting multiple common PDCCHs that need to be received by the UE.
  • the UE would maintain at least one best/preferred Tx beam from each TRP or each beam of a TRP, and determine the appropriate Rx beam and UE-common PDCCH resources to receive for each TRP or each beam of a TRP.
  • the UE-specific downlink control channel it would be beneficial, even necessary, for the UE to indicate to the network the best Tx beam to receive the downlink control channel, as such UE feedback would allow the network to provide better link quality for the downlink control channel and also to support MU-MIMO transmissions of UE-specific control channels. Nevertheless, it is worth noting that it may not be precluded to support to transmission of UE-specific downlink control channels on the same beam(s) as those used for UE-common downlink control channels.
  • the RS is a cell-specific RS, which is one or more of NR-SSS, MRS or cell-specific CSI-RS).
  • the network can obtain UE measurement report as soon as in Msg 3 of random access procedure during the initial access procedure and starts transmission of UE-specific PDCCH on the preferred Tx beam by the UE from Msg 4 onwards. Beam management including beam switching can be subsequently performed based on regular UE measurement reports on a set of cell-specific RSs.
  • the Tx beam used for transmission can correspond to a 1 st type of RS; whereas for the non-fallback UE-specific PDCCH, the Tx beam used for transmission can correspond to a 2 nd type of RS.
  • the 1 st type of RS can correspond to a cell-specific RS (e.g. NR-SSS, MRS, BRS, cell-specific CSI-RS) or a 1 st kind of UE-specific RS (e.g. UE-specific CSI-RS).
  • the 2 nd type of RS can correspond to a UE-specific RS (e.g.
  • UE-specific CSI-RS (which is a 2 nd kind of UE-specific RS, if a 2 nd one is defined for the fallback transmission).
  • the UE uses the best/preferred detected/measured RS of the 1 st type and the 2 nd type as the QCL reference to receive the fallback UE-specific PDCCH and the non-fallback UE-specific PDCCH, respectively.
  • the Rx beam used by the UE to receive the fallback and non-fallback UE-specific PDCCH corresponds to the best/preferred detected/measure RS of the 1 st type and the 2 nd type, respectively.
  • This UE procedure is illustrated in FIGURE 15.
  • FIGURE 15 illustrates an example UE procedure 1500 for receiving UE-specific fallback PDCCH and non-fallback UE-specific PDCCH according to embodiments of the present disclosure.
  • An embodiment of the UE procedure 1500 shown in FIGURE 15 is for illustration only.
  • One or more of the components illustrated in FIGURE 15 can be implemented in specialized circuitry configured to perform the noted functions or one or more of the components can be implemented by one or more processors executing instructions to perform the noted functions. Other embodiments are used without departing from the scope of the present disclosure.
  • the UE-specific PDCCH is multiplexed in the same (or overlapping) time domain resources as that for the UE-common PDCCH, or other common physical channels/signals such as NR PBCH/NR SS (which is detected/received with the 1 st type of RS as the reference QCL), the UE-specific PDCCH is a fallback PDSCH; else if the UE-specific PDCCH is not multiplexed in the same (or overlapping) time domain resources as that for the UE-common PDCCH or other common physical channels/signals such as NR PBCH/NR SS, the UE-specific PDCCH is a non-fallback PDCCH.
  • the above procedures can be extended to the deployment scenarios where there can be multiple TRPs transmitting multiple UE-specific PDCCHs that need to be received by the UE, or there can be multiple Tx beams from a single TRP, transmitting multiple UE-specific PDCCHs that need to be received by the UE.
  • the UE would maintain at least one best/preferred Tx beam from each TRP or each beam of a TRP, and determine the appropriate Rx beam and UE-specific PDCCHs resources to receive for each TRP or each beam of a TRP.
  • the UE can feed back to the network the measurement reports of the beams or the RS corresponding to the beams, or indicate its preferred Tx beams or equivalently the identity of the RS corresponding to the preferred Tx beams.
  • Certain common PDSCHs can be UE-group common in nature. In other words, the PDSCH targets a subset of UEs served by the TRP, rather than all UEs served by the TRP. Examples of such common PDSCHs are random access responses (RAR), paging, or certain system information blocks (SIBs). It can be beneficial from the network's perspective if it can identify the best Tx beam to transmit to a subset of UEs even for common PDSCHs, to improve the data rate or to increase reliability of transmission.
  • RAR random access responses
  • SIBs system information blocks
  • the network can also perform spatial division multiplexing on multiple subsets of UEs and transmit different data streams on different UE-group common PDSCHs.
  • common PDSCHs such as those corresponding to SIB that contains essential system access information (analogous to SIB1 and SIB2 in LTE)
  • they may be received by all UEs. Therefore, if the network wants to apply different transmission schemes to different set of common PDSCHs, there is a need for the UE to determine how the UE may receive the different set of common PDSCHs, e.g. in the form of beam management procedure.
  • Determining the best/preferred Tx beam to receive a signal or channel means the UE can determine the DL RS that can be considered QCL-ed with the signal or the channel, and the Rx beam that the UE may use to receive the signal or the channel.
  • the set of common PDSCHs whereby the beams to receive them is indicated by the network is predefined in the standards specifications. This reduces signaling overhead and simplifies a UE procedure.
  • the set of common PDSCHs whereby the beams to received is indicated by the network is configured by the network. This allows network flexibility to determine which set of common PDSCHs which it wants to apply specific transmission schemes, such as MU-MIMO and precoding.
  • a first beam for receiving a first set of common PDSCHs can be based on UE selection of the best or preferred Tx beam or cell-specific RS; whereas a second beam for receiving a second set of common PDSCHs can be based on network indication.
  • the first set of common PDSCHs can be predefined in standards to be the PDSCHs to deliver system information blocks containing essential system information such as the system bandwidth, the PRACH resources, PLMD id, etc. It can also be configured by the network to include other common PDSCHs such as RAR and paging.
  • the first beam can be the same as the beam used for receiving NR PBCH.
  • the second set of common PDSCHs can be predefined in standards to be RAR and paging or can be configured by the network to include one or more of the aforementioned common PDSCHs. For paging, it can be specified that the UE uses different beams or apply beam management procedure depending on whether the UE is in RRC connected more or not. When the UE is in idle mode, paging is received with the first beam; else paging is received with the second beam.
  • FIGURE 16 illustrates an example UE procedure 1600 of determining beams for receiving common PDSCHs according to embodiments of the present disclosure.
  • An embodiment of the UE procedure 1600 shown in FIGURE 16 is for illustration only.
  • One or more of the components illustrated in FIGURE 16 can be implemented in specialized circuitry configured to perform the noted functions or one or more of the components can be implemented by one or more processors executing instructions to perform the noted functions.
  • Other embodiments are used without departing from the scope of the present disclosure.
  • the procedure of determining beams to be used for receiving certain common PDSCHs can depend on whether the UE is in RRC connected state or in non-idle mode. This is illustrated in FIGURE 16.
  • the beam indication may be referred as a beam indicator.
  • the beam indication can refer to indication of BPL, TX RS resource (including SS block signal such as NR-SSS/PBCH DM-RS, CSI-RS), QCL reference.
  • the signaling options' pros and cons are summarized below.
  • this can be realized by including QCL information in the RRC control message, e.g. the RS information that is QCL-ed with the PDSCHs to be scheduled.
  • advantages are: more reliable signaling (error probability ⁇ 10 -6 ) compared to MAC CE signaling (error probability ⁇ 10 -3 ) and DCI signaling (error probability ⁇ 10 -2 ); and RRC signaling is ACK/NACK-ed by the UE.
  • disadvantages are: longer signaling latency (up to 15ms based on LTE, although it can be shorter typically) compared to MAC CE signaling ( ⁇ 6ms based on LTE numerology) and DCI signaling ( ⁇ a few OFDM symbols); and signaling overhead is larger compared to the DCI signaling approach since PDSCH is needed.
  • PDCCH scheduling the RRC message needs larger size than that for the PDCCH for DCI signaling.
  • MAC signaling e.g. with MAC control element (CE)
  • QCL information e.g. the RS information that is QCL-ed with the PDSCHs to be scheduled.
  • advantages are: more reliable than DCI signaling; signaling is ACK/NACK-ed by the UE; and signaling latency is slightly lower compared to RRC signaling.
  • disadvantages are: signaling latency is larger than DCI signaling; and signaling overhead is larger compared to the DCI signaling approach since PDSCH is needed.
  • PDCCH scheduling the MAC CE needs larger size than that for the PDCCH for DCI signaling.
  • DCI signaling this can be realized by including QCL information in the DL assignment DCI, e.g. the RS information that is QCL-ed with the scheduled PDSCH.
  • DCI signaling separate from the DCI for DL assignment.
  • advantages are: lower signaling latency compared to RRC and MAC CE signaling; and signaling overhead is smaller since PDSCH is not needed.
  • disadvantages are: less reliable compared to RRC and MAC CE signaling; and signaling is not ACK/NACK-ed by the UE.
  • Implicit DCI indication for PDSCH beam is also possible.
  • Some example approaches are given below: apply a mask to scramble CRC parity bits for the DCI message where the mask is generated as a function of the BPL/beam/RS/QCL reference index used to transmit the corresponding PDSCH; and scramble the RNTI value of the DCI with a number which is generated as a function of the corresponding BPL/beam/RS/QCL reference index. Due to the different attributes associated with each signaling method, different signaling method can be used for beam indication for different PDSCH types.
  • FIGURE 17 illustrates an example UE procedure 1700 for determining the control signaling method depending on the PDSCH type according to embodiments of the present disclosure.
  • An embodiment of the UE procedure 1700 shown in FIGURE 17 is for illustration only.
  • One or more of the components illustrated in FIGURE 17 can be implemented in specialized circuitry configured to perform the noted functions or one or more of the components can be implemented by one or more processors executing instructions to perform the noted functions. Other embodiments are used without departing from the scope of the present disclosure.
  • a higher layer based beam indication (e.g. MAC CE) signaling is used for receiving common PDSCHs (or a subset of common PDSCHs); whereas L1 based beam indication signaling (with PDCCH) is used for receiving unicast PDSCHs.
  • the procedures are illustrated in FIGURE 17(a) and FIGURE 17(b). Whether a PDSCH is common or unicast is distinguished with the RNTI type that is associated with the PDSCHs (e.g. the RNTI is used to scramble the PDSCH and is associated with the PDCCH that schedules the PDSCH). It is also noted that the same higher layer beam indication signaling can be applied to both the common PDSCHs and the PDCCHs beam management procedure.
  • the beam indication for common or UE-group common PDSCH and PDCCH is done with higher layer signaling such as an RRC signaling or a combination of RRC and MAC CE signaling; in this case, the PDCCH scheduling the common or UE-group common PDSCH does not include L1 beam indication.
  • the beam indication for unicast PDSCH is done with at least L1 signaling (including a combination of RRC and L1 signaling, or a combination of RRC, MAC CE and L1 signaling) as a part of the DCI scheduling the unicast PDSCH.
  • the same signaling method is used for both common PDSCH and unicast PDSCH, but the signaling carries an indication information to indicate if the signaling is applied to common PDSCHs (or the configured common PDSCHs) or the unicast PDSCHs.
  • An example of the indication information can be an explicit bit field in the signaling. This is illustrated in FIGURE 18.
  • FIGURE 18 illustrates an example UE procedure 1800 for determining the PDSCH type associated with the beam indication signaling according to embodiments of the present disclosure.
  • An embodiment of the UE procedure 1800 shown in FIGURE 18 is for illustration only.
  • One or more of the components illustrated in FIGURE 18 can be implemented in specialized circuitry configured to perform the noted functions or one or more of the components can be implemented by one or more processors executing instructions to perform the noted functions.
  • Other embodiments are used without departing from the scope of the present disclosure.
  • the MAC-CE jointly indicates the type of PDSCH/PDCCH (fallback/non-fallback) and the BPL information (which beam to apply).
  • each PDSCH BPL is associated with a 1 bit Type indicator [Type 0 (used for common PDSCH) or Type 1 (unicast PDSCH)] conveyed in the MAC CE. This helps the UE to establish a linkage between a BPL and the type of PDSCH (resp. PDCCH). Similar principles can be applied for the PDCCH BPL signaling.
  • the indication field indicates an index into the above table. This also enables further compression of the RS resource signaling within the L1 message.
  • FIGURE 19 illustrates an example UE procedure 1900 for determining the control signaling scheme depending on the unicast PDSCH type according to embodiments of the present disclosure.
  • An embodiment of the UE procedure 1900 shown in FIGURE 19 is for illustration only.
  • One or more of the components illustrated in FIGURE 19 can be implemented in specialized circuitry configured to perform the noted functions or one or more of the components can be implemented by one or more processors executing instructions to perform the noted functions.
  • Other embodiments are used without departing from the scope of the present disclosure.
  • a higher layer based beam indication (e.g. MAC CE) signaling is used for receiving fallback unicast PDSCHs; whereas L1 based beam indication signaling (with PDCCH) is used for receiving non-fallback unicast PDSCHs.
  • the DCI scheduling the fallback unicast PDSCHs do not have explicit bit field for the L1 beam indication.
  • Fallback PDSCH is capable of robust unicast data transmission, and non-fallback unicast PDSCH is capable of high spectral efficiency/high data rate transmission.
  • the same signaling method is used for both fallback unicast PDSCH and non-fallback unicast PDSCH, but the signaling carries indication information to indicate if the signaling is applied to fallback unicast PDSCHs or the non-fallback unicast PDSCHs.
  • An example of the indication information can be an explicit bit field in the L1 beam indication signaling.
  • the L1 beam indication signaling can be a newly designed DCI format.
  • the L1 beam indication signaling can also be included in the DL assignment DCI formats.
  • the DL assignment DCI format for fallback unicast PDSCH includes only the beam indication information for fallback unicast PDSCH, while the DL assignment DCI format for non-fallback unicast PDSCH includes only the beam indication information for non-fallback unicast PDSCH.
  • the DL assignment DCI formats for both types of unicast PDSCHs include the beam indication for both types of unicast PDSCHs. This increases the reliability of overall signaling mechanism.
  • the DL assignment DCI formats for fallback unicast PDSCHs include the beam indication for both types of unicast PDSCHs, while the DL assignment DCI formats for non-fallback unicast PDSCHs include the beam indication for only the non-fallback unicast PDSCHs. In yet another example, the DL assignment DCI formats for non-fallback unicast PDSCHs include the beam indication for both types of unicast PDSCHs, while the DL assignment DCI formats for fallback unicast PDSCHs include the beam indication for only the fallback unicast PDSCHs.
  • the MAC-CE jointly indicates the type of PDSCH/PDCCH (fall-back/non fall-back) and the BPL information (which beam to apply).
  • each PDSCH BPL is associated with a 1 bit Type indicator [Type 0 (used for fallback PDSCH) or Type 1 (non-fallback PDSCH)] conveyed in the MAC CE. This helps the UE to establish a linkage between a BPL and the type of PDSCH (resp. PDCCH).
  • the indication field indicates an index into the above table. This also enables further compression of the RS resource signaling within the L1 message.
  • a DCI format for a beam indication is specified for indicating the beams to be used for fallback unicast PDSCH, whereas the beam indication information is included in the DL assignment DCI for the non-fallback unicast PDSCH. This allows the DCI format for beam indication for fallback.
  • the beam indication procedure for PDSCH can be implemented as follows, where QCL signaling is assumed to be the realization of beam indication signaling.
  • MAC CE signaling to indicate activation or deactivation of RSRP/CSI reporting. If the RS is not associated with any activated reporting, the RS is not used for QCL reference; else the RS is used for QCL reference.
  • MAC CE signaling to indicate RS to be used for QCL reference (or the RS not to be used for QCL reference, which can achieve the same effect).
  • the RS could correspond to P/SP CSI-RS or SS Block or an on-demand resource such as AP CSI-RS.
  • the advantage of this signaling is that it can be used to exclude RS that cannot be deactivated in (a) or (b).
  • SS block or periodic CSI-RS that cannot be excluded in (a) or (b) can be excluded from QCL reference with (c).
  • the linkage between a QCL reference and the BPL for PDSCH reception can be established in either an implicit or an explicit manner.
  • the UE assumes that the PDSCH BPL index is identical to the identifier of the activated QCL reference.
  • the UE assumes that the PDSCH BPL index is linked to the order (e.g. chronological) in which the MAC CE is received.
  • the MAC-CE additionally contains a PDSCH BPL index field in addition to indicating the index of the activated RS.
  • the UE upon reception of a MAC-CE associating that PDSCH BPL index with a second (different) QCL reference RS resource k, the UE assumes that RS resource j has been deactivated and subsequently applies for that BPL, the UE's receive beam (spatial filter) associated with QCL reference k.
  • a second different embodiment of the explicit method if that PDSCH BPL index is associated with a RS resource j as QCL reference, then upon reception of a MAC-CE associating that PDSCH BPL index with a second (different) QCL reference RS resource k, then the UE treats both RS resources j and k as activated, while receiving that PDSCH BPL assuming QCL reference k.
  • This embodiment is useful if the network wants to replace a PDSCH BPL that was earlier used for receiving a coarse beam (E.g. P/SP CSI-RS) with a refined beam (e.g. AP CSI-RS).
  • FIGURE 20 illustrates an example MAC-CE signaling 2000 to update QCL reference according to embodiments of the present disclosure.
  • An embodiment of the MAC-CE signaling 2000 shown in FIGURE 20 is for illustration only.
  • One or more of the components illustrated in FIGURE 20 can be implemented in specialized circuitry configured to perform the noted functions or one or more of the components can be implemented by one or more processors executing instructions to perform the noted functions.
  • Other embodiments are used without departing from the scope of the present disclosure.
  • FIGURE 20 shows two examples demonstrating how the network can, via MAC-CE signaling, dynamically vary the assumed QCL reference at the UE for receiving PDSCH thereby adapting to different phenomena (e.g., UE mobility, orientation changes, blockage etc.).
  • phenomena e.g., UE mobility, orientation changes, blockage etc.
  • MAC CE signaling to down select QCL references can be configurable. The reason is that if the number of beams or RS configured by RRC is not large and can be addressed by the bit field in the DCI, then the need for further down-selection is not strong.
  • DCI signaling indicates one of the BPLs indicated in previous MAC CE (s) for PDSCH reception.
  • the bit field indicates the QCL reference ID which can be one of the RS resource sets, resources, port IDs configured by RRC and MAC CE (if configured). There are two methods for mapping the bit field value to the QCL reference ID when the MAC CE signaling is configured.
  • FIGURE 21 illustrates an example RRC, MAC-CE, and DCI 2100 according to embodiments of the present disclosure.
  • An embodiment of the RRC, MAC-CE, and DCI 2100 shown in FIGURE 21 is for illustration only.
  • One or more of the components illustrated in FIGURE 21 can be implemented in specialized circuitry configured to perform the noted functions or one or more of the components can be implemented by one or more processors executing instructions to perform the noted functions. Other embodiments are used without departing from the scope of the present disclosure.
  • AP CSI-RS Aperiodic CSI-RS resources
  • the AP CSI-RS resources are dynamically triggered and used for refining either the network (TX) beams or UE (RX) beams.
  • the network may be able to flexibly use the same set of AP CSI-RS resources (resource elements, antenna ports etc.) to pool different sets of refined beams as a function of which coarse beam's angular coverage maximally covers the UE at any given point in time. To do so, the network may be able to indicate to the UE in a flexible and dynamic manner, the QCL relation between a set of dynamically triggered RS (AP CSI-RS) and a periodic RS.
  • AP CSI-RS dynamically triggered RS
  • Periodic CSI-RS resources P CSI-RS 1 and P CSI-RS 2 each covering a 120 degree in the azimuthal domain and suppose the network configures the UE with one AP CSI-RS set (e.g. the set could consists of 8 beams each covering 15 degrees).
  • the network could dynamically convey QCL association between AP CSI-RS and P CSI-RS 1, so that the UE applies the spatial filter used to receive P CSI-RS1 to also receive AP-CSI-RS and determine the strongest refined beam within the angular coverage of P CSI-RS 1.
  • the network would choose to indicate QCL association between AP CSI-RS with P CSI-RS 2, if the UE subsequently moves to within angular coverage of P CSI-RS 2 and the network wants to refine the network's transmitted beams in the direction of P CSI-RS 2.
  • the network can dynamically and flexibly vary the linkage between AP CSI-RS and P/SP CSI-RS used for PDSCH reception through either explicit (e.g. via MAC-CE signaling) or implicitly.
  • a MAC-CE indicates QCL between a set of AP CSI-RS resource and a P/SP CSI-RS resource. This indication conveys two sets of information to the UE. First, the UE may assume that the receive beam applied on the activated P/SP CSI-RS resource can be used either as is, or refined further (during receive beam sweep), while receiving AP CSI-RS.
  • the UE may assume that the receive beam applied at the UE during reception of that AP CSI-RS resource can also be used to receive the PDSCH which uses the P/SP CSI-RS resource as a QCL reference.
  • the UE may consider it an error case if the MAC-CE signaling indicates QCL between an AP CSI-RS resource and a de-activated P/SP CSI-RS resource.
  • implicit QCL relation can be used to avoid the need for semi-static QCL configuration for a certain CSI-RS such aperiodic CSI-RS that is used for Tx or Rx beam refinement.
  • dynamic QCL relation via implicit signaling, is motivated for efficiently indicating to the UE what spatial receive filter (beam) the UE may apply in order to receive a certain CSI-RS such as aperiodic CSI-RS.
  • RRC signaling configures an aperiodic CSI-RS resource.
  • the UE assumes PDSCH DM-RS that shares the same QCL reference with the PDCCH triggering the aperiodic CSI-RS has the same spatial QCL with the aperiodic CSI-RS (i.e. the UE may use the same refined Rx beam to receive the PDSCH that shares the same QCL reference with the PDCCH).
  • the PDSCH DM-RS can be determined to share the same QCL reference as the PDCCH that triggers the aperiodic CSI-RS through explicit signaling in the DCI that schedules the PDSCH, or through implicit indication (e.g. the PDSCH is assumed to share the same QCL reference as the corresponding PDCCH that performs the DL assignment.
  • the network sends a PDCCH triggering UE Rx refinement procedure by triggering an aperiodic CSI-RS in time n
  • the UE performs Rx beam refinement and determines the best refined Rx beam.
  • the network sends a PDCCH with DL assignment (DL data in PDSCH), whereby the DL assignment PDCCH has the same QCL reference as the PDCCH triggering the aperiodic CSI-RS previously, then the UE assumes the same refined Rx for receiving the PDSCH.
  • the above schemes of implicit QCL reference indication of PDSCH can be extended the case the PDCCH triggering the aperiodic CSI-RS and/or the PDCCH assigning the PDSCH, includes a QCL reference.
  • the PDCCH triggering the aperiodic CSI-RS includes a QCL reference for the aperiodic CSI-RS, which can be different than the beam used for the PDCCH trigger, in time n.
  • the UE performs Rx beam refinement and determines the best refined Rx beam (using the baseline Rx beam corresponding to the indicated QCL reference for refinement).
  • a UE may be RRC configured with multiple resource settings, where each of these resource settings comprises SS blocks or CSI-RS resources (which can be P CSI-RS resources, SP CSI-RS resources or AP CSI-RS resources).
  • CSI-RS resources which can be P CSI-RS resources, SP CSI-RS resources or AP CSI-RS resources.
  • Step 1 a mapping table from each QRI (QCL reference indicator) states to resource setting indices that are possible QCL references is indicated in the RRC.
  • QRI QCL reference indicator
  • the MAC CE signaling further indicates the beam index (e.g., CRI or SS block index) corresponding to each QRI state.
  • the beam indices are defined with respect to each resource setting.
  • the N1 beams corresponding to resource setting 1 have beam indices of 0, 1, ..., N1-1; and the N2 beams corresponding to resource setting 2 have beam indices of 0, 1, ..., N2-1.
  • the network decides to use beam indices 2 and 4 for setting 0, and beam indices 1 and 10 for setting 1 as beam candidates for PDSCH and beam refinement CSI-RS (AP-CSI-RS).
  • AP-CSI-RS beam refinement CSI-RS
  • the MAC CE signaling indicates this information on top of the RRC configured TABLE 1B.
  • the beam indices in TABLE 1B are configured together with resource setting indices during Step 1; and the updated beam indices are configured during Step 2.
  • the pool of beam indices to be used for the MAC CE indication for a QRI state corresponding to a resource setting is a set of activated resources in the resource setting or in activated resource sets of the resource setting.
  • resource setting 0 has 64 resources; and MAC CE signaling have activated a resource set comprising 8 resources (e.g., resources 0-7) only and the rest of the resources in the resource setting are deactivated.
  • the pool of beam indices may be CRI 0-7.
  • the MAC CE signaling to indicate a beam index for the 1 st QRI state has a 3 bit field of indicating a resource selected from the activated resources (i.e., resources 0-7).
  • the MAC CE signaling may comprise: a [2]-bit field to indicate a resource setting index, assuming that up to [4] resource settings can be configured; a [3]-bit field to indicate a first CRI out of the pool of resources, assuming that up to [8] resources can be activated per resource setting; and a [3]-bit field to indicate a second CRI out of the pool of resources, assuming that up to [8] resources can be activated per resource setting.
  • This second field is useful for non-coherent JT, and may be active only when non-coherent JT transmission/feedback is configured.
  • the QRI can be used in a DL DCI for indicating a pair of (resource setting index, beam index) to be used as a QCL reference for PDSCH reception.
  • the QRI can also be used in a UL DCI for indicating a pair of (resource setting index, beam index) to be used as a QCL reference for AP CSI-RS reception for the AP CSI/BSI reporting.
  • a QRI state may be associated with a plurality of pairs of (resource setting index, beam index) when supporting NC-JT, with DMRS grouping.
  • the UE may assume that a first DMRS group is QCL'ed with the CSI-RS or SS block corresponding to a first pair; and a second DMRS group is QCL'ed with the CSI-RS or SS block corresponding to a second pair.
  • “resource setting" can be replaced with "resource set.”
  • FIGURE 23 An overview of some example cases of QCL association configurations is illustrated in FIGURE 23.
  • the cases depicted here are not intended to be comprehensive. Combinations of the cases, different case for different UE in the same network, or switching of the cases for the same UE are also possible.
  • case a only the SS-block is implicitly/explicitly configured as QCL reference by the network.
  • NR-PDCCH and NR-PDSCH are only QCL-ed with the SS block.
  • This case allows support of streamlined beam management procedure without the need for UE-specific CSI-RS configurations.
  • This case is useful when the network or the UE does not need fine beam alignment required for high data rate transmission. It can also be useful with the SINR condition for the UE achievable with the SS block beam is already very high (e.g. it is close to the cell center with LOS).
  • both the SS-block and the CSI-RS are configured as QCL references by the network.
  • NR-PDCCH is configured to be QCL-ed with the SS-block and the NR-PDSCH is configured to be QCL-ed with the CSI-RS.
  • This case supports the scenario where the NR-PDCCH is transmitted on a coarse Tx beam, whereas the NR-PDSCH is transmitted on a fine Tx beam after a P2 procedure.
  • the CSI-RS is configured to be QCL-ed with the SS-block.
  • the CSI-RS is configured to be QCL-ed with the SS-block corresponding to the separate TRP.
  • the CSI-RS is configured as the QCL reference by the network for both NR-PDCCH and NR-PDSCH.
  • the CSI-RS is configured to be QCL-ed with the SS-block. This case enables both NR-PDCCH and NR-PDSCH to be QCL-ed with CSI-RS which can be transmitted on a different beam than that for the SS-block.
  • the beam for CSI-RS can be narrower than that for the SS-block and hence can either support higher beamforming gain for higher spectral efficiency or support higher order MU-MIMO.
  • SS-block, periodic/semi-persistent CSI-RS, and aperiodic CSI-RS are configured as the QCL references by the network.
  • the CSI-RS resources are configured to be QCL-ed with the SS-block.
  • This case supports case (c) and in addition enables Tx and Rx beam refinement (P3 procedure) to be performed based on aperiodic CSI-RS resources.
  • the NR-PDSCH can be received by the UE with the refined Tx and Rx beams. Explicit and implicit QCL association between RS resources is possible.
  • Implicit QCL association can be considered at least for the following: If a NR-PDCCH that is QCL-ed with a RS resource triggers an aperiodic CSI-RS, the aperiodic CSI-RS is QCL-ed with the RS resource. Such implicit QCL association avoids the need for RRC configuration of the QCL relationship for the aperiodic CSI-RS and allows the aperiodic CSI-RS resource's QCL relation to be dynamically switched between the periodic or semi-persistent CSI-RS.
  • Certain common PDCCHs can be UE-group common in nature. In other words, the PDCCH targets a subset of UEs served by the TRP, rather than the all UEs served by the TRP. Examples of such common PDCCHs are PDCCH for scheduling random access responses (RAR), paging, or certain system information blocks (SIBs), PDCCH for transmit power control (TPC), PDCCH for triggering PRACH. It can be beneficial from the network's perspective if the network can identify the best Tx beam to transmit to a subset of UEs even for common PDCCHs, to improve the data rate or to increase reliability of transmission.
  • RAR random access responses
  • SIBs system information blocks
  • TPC transmit power control
  • PRACH Physical Downlink Control
  • the network can also perform spatial division multiplexing on multiple subsets of UEs and transmit different data streams on different UE-group common PDCCHs.
  • common PDCCHs such as those corresponding to scheduling of SIB that contains essential system access information (analogous to SIB1 and SIB2 in LTE)
  • they may be received by all UEs. Therefore, if the network wants to apply different transmission schemes to different set of common PDCCHs, there is a need for the UE to determine how the UE may receive the different set of common PDCCHs, e.g. in the form of beam management procedure.
  • Determining the best/preferred Tx beam to receive a signal or channel means the UE can determine the DL RS that can be considered QCL-ed with the signal or the channel, and the Rx beam that the UE may use to receive the signal or the channel.
  • the set of common PDCCHs whereby the beams to receive them is indicated by the network is predefined in the standards specifications. This reduces signaling overhead and simplifies UE procedure.
  • the set of common PDCCHs whereby the beams to received is indicated by the network is configured by the network. This allows network flexibility to determine which set of common PDCCHs which it wants to apply specific transmission schemes, such as MU-MIMO and precoding.
  • a first beam for receiving a first set of common PDCCHs can be based on UE selection of the best or preferred Tx beam or cell-specific RS; whereas a second beam for receiving a second set of common PDCCHs can be based on network indication.
  • the first set of common PDCCHs can be predefined in standards to be the PDCCHs for scheduling the system information blocks containing essential system information such as the system bandwidth, the PRACH resources, PLMD id, etc. It can also be configured by the network to include other common PDCCHs for TPC and for scheduling RAR and/or paging.
  • RRC configures CORESETs.
  • Each CORESET configuration includes an index to a QCL reference. If the CORESET configuration does not include a QCL reference index, the SS block that the UE is in-sync with is the QCL reference.
  • a network may know what CORESET to assign, but not know which QCL reference index to set (until it pulls in a beam group report from the UE). There can be a need to define a procedure to update the QCL reference for a previously configured CORESET. In one approach, the following procedure can be defined: RRC configures CORESET(s).
  • FIGURE 25 illustrates an example UE procedure 2500 for determining the control signaling method depending on the PDCCH type according to embodiments of the present disclosure.
  • An embodiment of the UE procedure 2500 shown in FIGURE 25 is for illustration only.
  • One or more of the components illustrated in FIGURE 25 can be implemented in specialized circuitry configured to perform the noted functions or one or more of the components can be implemented by one or more processors executing instructions to perform the noted functions. Other embodiments are used without departing from the scope of the present disclosure.
  • the same signaling method is used for both common PDCCH and unicast PDCCH, but the signaling carries an indication information to indicate if the signaling is applied to common PDCCHs (or the configured common PDCCHs) or the unicast PDCCHs.
  • An example of the indication information can be an explicit bit field in the signaling. This is illustrated in FIGURE 26.
  • the UE has a timer which starts when it gets a BPL indication. If the UE does not receive a PDCCH on the new BPL before the timer expires, it may assume that the previous BPL is still active.
  • the timer duration can be predefined, higher layer configured or implicitly derived from other system parameters such as the PDCCH/CORESET monitoring period (e.g. an integer multiple of the configured PDCCH/CORESET monitoring period). In this way, the UE's connectivity can be restored quickly.
  • the network can transmit PDCCH/PDSCH on the new BPL and also transmit the BPL indication signaling or a PDCCH/PDSCH on the old BPL, and then monitor the response from the UE to determine which BPL the UE is currently assuming.
  • beam management is defined as follows: beam management for a set of L1/L2 procedures to acquire and maintain a set of TRP(s) and/or UE beams that can be used for DL and UL transmission/reception, which include at least following aspects; beam determination for TRP(s) or UE to select of the UE own Tx/Rx beam(s); beam measurement for TRP(s) or UE to measure characteristics of received beamformed signals; beam reporting for UE to report information a property/quality of beamformed signal(s) based on beam measurement; beam sweeping for operation of covering a spatial area, with beams transmitted and/or received during a time interval in a predetermined way.
  • Tx/Rx beam correspondence at TRP holds if at least one of the following is satisfied: TRP is able to determine a TRP Rx beam for the uplink reception based on UE's downlink measurement on TRP's one or more Tx beams; TRP is able to determine a TRP Tx beam for the downlink transmission based on TRP's uplink measurement on TRP's one or more Rx beams; Tx/Rx beam correspondence at UE holds if at least one of the following is satisfied; a UE is able to determine a UE Tx beam for the uplink transmission based on UE's downlink measurement on UE's one or more Rx beams; a UE is able to determine a UE Rx beam for the downlink reception based on TRP's indication based on uplink measurement on UE's one or more Tx beams; and capability indication of UE beam correspondence related information to TRP
  • Tx/Rx beam correspondence is for convenience of discussion.
  • the detailed performance conditions are up to RAN4.
  • the following DL L1/L2 beam management procedures are supported within one or multiple TRPs: P-1 is used to enable UE measurement on different TRP Tx beams to support selection of TRP Tx beams/UE Rx beam(s); for beamforming at TRP, it typically includes an intra/inter-TRP Tx beam sweep from a set of different beams.
  • At least network triggered aperiodic beam reporting is supported under P-1, P-2, and P-3 related operations.
  • Reporting information at least include measurement quantities for L beam (s) and information indicating L DL Tx beam(s), if L ⁇ K.
  • NZP non-zero power
  • K CSI-RS resources can be the same, e.g. port number, time-domain behavior, density and periodicity if any
  • a UE reports information about TRP Tx Beam(s) that can be received using selected UE Rx beam set(s) where a Rx beam set refers to a set of UE Rx beams that are used for receiving a DL signal. Note that it is UE implementation issues on how to construct the Rx beam set.
  • a Rx beam set refers to a set of UE Rx beams that are used for receiving a DL signal.
  • each of Rx beam in a UE Rx beam set corresponds to a selected Rx beam in each panel.
  • the UE can report TRP Tx Beam(s) and an identifier of the associated UE Rx beam set per reported TX beam(s).
  • different TRP Tx beams reported for the same Rx beam set can be received simultaneously at the UE.
  • different TRP TX beams reported for different UE Rx beam set may not be possible to be received simultaneously at the UE.
  • a UE reports information about TRP Tx Beam(s) per UE antenna group basis where UE antenna group refers to receive UE antenna panel or subarray.
  • the UE can report TRP Tx Beam(s) and an identifier of the associated UE antenna group per reported TX beam.
  • different TX beams reported for different antenna groups can be received simultaneously at the UE.
  • Different TX beams reported for the same UE antenna group may not be possible to be received simultaneously at the UE.
  • An NR supports that UE can trigger mechanism to recover from beam failure.
  • Beam failure event occurs when the quality of beam pair link(s) of an associated control channel falls low enough (e.g. comparison with a threshold, time-out of an associated timer).
  • Mechanism to recover from beam failure is triggered when beam failure occurs.
  • the beam pair link is used for convenience, and may or may not be used in specification.
  • Network explicitly configures to UE with resources for UL transmission of signals for recovery purpose. Configurations of resources are supported where the base station is listening from all or partial directions, e.g., random access region.
  • An NR supports beam management with and without beam-related indication.
  • beam-related indication information pertaining to UE-side beamforming/receiving procedure used for CSI-RS-based measurement can be indicated through QCL to UE.
  • NR supports using the same or different beams on control channel and the corresponding data channel transmissions.
  • a beam pair link is represented by a pair of Tx beam and Rx beam (e.g. pair of Tx beam ID and Rx beam ID). If UE doesn't perform Rx beamforming, then a beam pair link can be simply represented by the Tx beam (Tx beam ID).
  • Tx beam ID Tx beam ID
  • the Tx beams or the corresponding RS resources/ports that can be indicated in the beam indication signaling is one or more of the RS resources/ports belonging to the M resource settings.
  • NR supports periodic, aperiodic, and semi-persistent transmissions of CSI-RS as follows: semi-persistent transmission; activation(s)/de-activation(s) of CSI-RS resource is triggered dynamically; preconfigured CSI-RS resources can be activated or de-activated; periodic transmission; periodic transmission can be configured by higher layer signaling; and periodic CSI-RS transmissions are semi-statically configured/re-configured.
  • NR CSI-RS pattern with at least the following properties is supported.
  • CSI-RS mapped in one or multiple symbols.
  • the following configurations of NR CSI-RS are supported: UE-specific configuration to support; wideband CSI-RS, i.e. from UE perspective, the full bandwidth the UE is configured to operate with; and partial-band CSI-RS, i.e. from UE perspective, part of the bandwidth the UE is configured to operate with.
  • NR For beam management overhead and latency reduction, NR also considers beam sweeping for CSI-RS within an OFDM symbol. Note that the symbol duration is based on reference numerology.
  • NZP CSI-RS resource is defined in NR, as a set of NZP CSI-RS port(s) mapped to a set of REs within a frequency span/a time duration which can be measured at least to derive a CSI.
  • Multiple NZP CSI-RS resources can be configured to UE at least for supporting CoMP and multiple beamformed CSI-RS based operations, where each NZP CSI-RS resource at least for CoMP can have different number of CSI-RS ports.
  • a UE can be configured with the following high layer parameters for beam management: N ⁇ 1 reporting settings, M ⁇ 1 resource settings.
  • the links between reporting settings and resource settings are configured in a CSI measurement setting.
  • CSI-RS based P-1 & P-2 are supported with resource and reporting settings.
  • FIGURE 27 illustrates an example configuration 2700 for beam management, CSI measurement and reporting and QCL indication according to embodiments of the present disclosure.
  • An embodiment of the configuration 2700 shown in FIGURE 27 is for illustration only.
  • One or more of the components illustrated in FIGURE 27 can be implemented in specialized circuitry configured to perform the noted functions or one or more of the components can be implemented by one or more processors executing instructions to perform the noted functions.
  • Other embodiments are used without departing from the scope of the present disclosure.
  • FIGURE 27 illustrates an example of the configurations to facilitate operations for beam management, CSI measurement/reporting and QCL indication.
  • the beam indication signaling for NR PDCCH indicates one or more beams or beam pair links (R) to be monitored by the UE for NR PDCCH.
  • the UE may monitor the NR PDCCHs on the indicated R beam pair links.
  • Monitoring of NR PDCCHs involves the UE attempting to decode NR PDCCHs on the time-frequency resources (or search space) corresponding to the indicated beam pair links.
  • the R beam pair links that can be indicated by the beam indication signaling may be selected from those with corresponding Tx beams or RS resources/ports (e.g. CSI-RS, NR SS) from one or more of the M resource settings configured.
  • R beam pair links indicated for NR PDCCH monitoring as “active” or “activated” or “serving” beam pair links and those that are included in the beam indication signaling as “inactive” or “deactivated” or “non-serving” beam pair links.
  • the activation/deactivation of CSI reporting for certain measurement settings is determined by the beam indication signaling content of NR PDCCH.
  • the beam indication signaling indicates R beam pair links to be monitored by the UE
  • the CSI reporting setting that is linked to the RS resources/ports corresponding to the R beam pair links via a measurement setting is assumed to be activated. This procedure is illustrated in FIGURE 28.
  • FIGURE 28 illustrates an example reporting setting activation procedure 2800 according to embodiments of the present disclosure.
  • An embodiment of the reporting setting activation procedure 2800 shown in FIGURE 28 is for illustration only.
  • One or more of the components illustrated in FIGURE 28 can be implemented in specialized circuitry configured to perform the noted functions or one or more of the components can be implemented by one or more processors executing instructions to perform the noted functions.
  • Other embodiments are used without departing from the scope of the present disclosure.
  • the beam indication signaling can also deactivate an active CSI reporting.
  • the UE determines the reporting setting(s) that is(are) linked to the RS resources/ports associated with the R beam pair links. This is referred to as set A.
  • the UE also determines the reporting setting(s) that is(are) linked to the RS resources/ports NOT associated with the R beam pair links. This is referred to as set B. If the reporting setting(s) (or reporting configuration(s) in the reporting setting(s)) in set A is(are) in deactivation status, they are activated, i.e. the UE begins reporting the measurement results.
  • reporting setting(s) or reporting configuration(s) in the reporting setting(s)) in set A is(are) in activation status, they continue to be activated or are reactivated. If the reporting setting(s) (or reporting configuration(s) in the reporting setting(s)) in set B is(are) in activation status, they are deactivated, i.e. UE stops reporting the measurement results. This is illustrated in FIGURE 29.
  • FIGURE 29 illustrates an example reporting setting activation/deactivation procedure 2900 according to embodiments of the present disclosure.
  • An embodiment of the reporting setting activation/deactivation procedure 2900 shown in FIGURE 29 is for illustration only.
  • One or more of the components illustrated in FIGURE 29 can be implemented in specialized circuitry configured to perform the noted functions or one or more of the components can be implemented by one or more processors executing instructions to perform the noted functions. Other embodiments are used without departing from the scope of the present disclosure.
  • the reporting setting is linked to a cell-specific RS resource setting, and is configured with a semi-persistent reporting behavior.
  • more than one semi-persistent reporting procedure is defined, one of which is the semi-persistent reporting that is activated/deactivated by beam indication signaling.
  • more than one activated/deactivation procedure of CSI reporting is defined, one of which is activation/deactivation by beam indication signaling.
  • a reporting setting is configured with activation/deactivation by beam indication signaling, the activation/deactivation by beam indication signaling is applicable.
  • Activation/deactivation of CQI reporting by beam indication signaling is beneficial since CQI calculation involves more complex UE processing and limiting the UE's calculation to beam pair links that are active for NR PDCCH monitoring reduces the need for UE processing.
  • the reporting may not be dependent on the beam indication signaling and this can be realized by not configuring activation/deactivation mechanism for reporting settings with RSRP/RSRQ reporting.
  • Such configuration can also be implicit, i.e. RSRP/RSRQ reporting is assumed by the UE to not be associated with beam indication signaling.
  • the network can also be scenarios where it can be beneficial for the network to obtain RSRP/RSRQ measurement results of the RS based on different time domain measurement or reporting procedures depending on the condition of the corresponding beam pair links.
  • the reporting periodicity can be shorter for the active beam pair links, while the reporting periodicity can be longer for the inactive beam pair links, wherein the active or inactive beam pair links are indicated by the beam indication signaling.
  • Other example of time domain behavior is measurement averaging behavior, such long term averaging or single time instance measurement (no averaging across slots/subframes). There can be different ways to realize this mechanism.
  • reporting setting that is "activated” when a beam pair link is "deactivated” by the beam indication signaling; in this case a signaling is needed to indicate to the UE what constitutes reporting "activation" by the beam indication signaling, e.g. 1 bit with 0 value to indicate reporting activation if the RS corresponding to a beam pair link is activated by the beam indication signaling, and value of 1 to indicate reporting activation if the RS corresponding to a beam pair link is deactivated by the beam indication signaling.
  • a reporting setting can be configured with multiple time domain measurement/reporting behavior. Linkage of the different time domain behavior to the "activation/deactivation" status of the beam pair link as indicated by the beam indication signaling can be explicitly configured in the reporting setting.
  • beam indication for NR PDCCH is used for describing the principles of the present disclosure, they can be extended to beam indication for other physical channels such as NR PDSCH.
  • the "activation” or “deactivation” of UE reporting behavior is described as “activation” or “deactivation” of measurement setting as illustrated in FIGURE 30.
  • the beam indication signaling for NR PDCCH explicitly indicates at least two types of beams or beam pair links.
  • the first type is the 'serving' beam or beam pair link.
  • the second type is the "non-serving" beam or beam pair link.
  • a third type can be beam or beam pair link not belonging to the first or the second type.
  • the UE may monitor the NR PDCCHs on the serving beam pair links, and the UE may perform measurement to generate measurement results such as RSRP, RSRQ or CSI on the RS associated with the serving and non-serving beam pair links (e.g. CSI-RS, NR SS). The UE does not perform measurement or monitoring on the third type.
  • the beam indication signaling indicates the type, along with the set of beam pair links (e.g. in the form of index or ID) belonging to the indicated type.
  • value 0 is used to indicate the first type
  • value 1 is used to indicate the second type
  • the rest of beams or beam pair links not belonging to the first or the second type but belonging to the set of beam or beam pair links that can be associated with the NR PDCCH (can be configured by higher layer signaling, such as RRC) are considered the third type.
  • more than one bit can be used to indicate the three (or more) types.
  • the same beam indication signaling (e.g. in a MAC CE) can contain the beam indications of all types.
  • the same type indication can be included in measurement setting (or reporting setting according to some of the embodiments disclosed in the present disclosure), to create the activation/deactivation linkage. For example, assuming the beam indication signaling indicates that there are R1 beams of type 0, then measurement setting or reporting setting where type 0 is included in the configuration is "activated.”
  • FIGURE 31 illustrates an example measurement setting activation/deactivation procedure 3100 according to embodiments of the present disclosure.
  • An embodiment of the measurement setting activation/deactivation procedure 3100 shown in FIGURE 31 is for illustration only.
  • One or more of the components illustrated in FIGURE 31 can be implemented in specialized circuitry configured to perform the noted functions or one or more of the components can be implemented by one or more processors executing instructions to perform the noted functions. Other embodiments are used without departing from the scope of the present disclosure.

Abstract

La présente invention se rapporte à un système de communication de pré-5ème génération (5G) ou 5G, apte à prendre en charge des débits de données supérieurs à ceux d'un système de communication de 4ème génération (4G), tel qu'un système d'évolution à long terme (LTE). L'invention concerne un procédé d'un équipement utilisateur (UE) de gestion de faisceau dans un système de communication sans fil. Le procédé consiste à recevoir, en provenance d'une station de base (BS), une signalisation de commande de ressources radio (RRC) et une signalisation d'élément de canal de commande d'accès au support (MAC CE) comprenant un indicateur de faisceau sur un canal de liaison descendante pour la gestion de faisceau, à identifier l'indicateur de faisceau sur la base de la signalisation RRC et de la signalisation MAC CE, et à déterminer l'indicateur de faisceau pour un canal de commande de liaison descendante physique (PDCCH), un canal partagé de liaison descendante physique (PDSCH) commun et un PDSCH à diffusion individuelle de secours.
PCT/KR2018/001402 2017-02-01 2018-02-01 Appareil et procédé de gestion de faisceau dans des systèmes de communication sans fil WO2018143702A1 (fr)

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CN201880009710.7A CN110249573A (zh) 2017-02-01 2018-02-01 用于无线通信系统中的波束管理的装置和方法

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US201762453312P 2017-02-01 2017-02-01
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US201762474385P 2017-03-21 2017-03-21
US62/474,385 2017-03-21
US201762511879P 2017-05-26 2017-05-26
US62/511,879 2017-05-26
US201762520927P 2017-06-16 2017-06-16
US62/520,927 2017-06-16
US201762540796P 2017-08-03 2017-08-03
US62/540,796 2017-08-03
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US201762547494P 2017-08-18 2017-08-18
US62/547,494 2017-08-18
US15/877,185 US10148337B2 (en) 2017-02-01 2018-01-22 Beam management of downlink data channel and downlink control channel for 5G next radio systems
US15/877,185 2018-01-22
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