WO2019195653A1 - Équipement utilisateur, et procédé de communication sans fil associé - Google Patents

Équipement utilisateur, et procédé de communication sans fil associé Download PDF

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Publication number
WO2019195653A1
WO2019195653A1 PCT/US2019/025946 US2019025946W WO2019195653A1 WO 2019195653 A1 WO2019195653 A1 WO 2019195653A1 US 2019025946 W US2019025946 W US 2019025946W WO 2019195653 A1 WO2019195653 A1 WO 2019195653A1
Authority
WO
WIPO (PCT)
Prior art keywords
csi
beams
resources
consecutive numbers
resource
Prior art date
Application number
PCT/US2019/025946
Other languages
English (en)
Inventor
Yuichi Kakishima
Min Liu
Satoshi Nagata
Original Assignee
Ntt Docomo, Inc.
Docomo Innovations, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ntt Docomo, Inc., Docomo Innovations, Inc. filed Critical Ntt Docomo, Inc.
Publication of WO2019195653A1 publication Critical patent/WO2019195653A1/fr

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Classifications

    • 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
    • H04B7/0619—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 using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/063—Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode 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
    • H04B7/0619—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 using feedback from receiving side
    • H04B7/0658—Feedback reduction
    • H04B7/066—Combined feedback for a number of channels, e.g. over several subcarriers like in orthogonal frequency division multiplexing [OFDM]
    • 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
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0868—Hybrid systems, i.e. switching and combining
    • H04B7/088—Hybrid systems, i.e. switching and combining using beam selection

Definitions

  • One or more embodiments disclosed herein relate to a user equipment in a wireless communication system and a wireless communication method of beam indexing for a Pl procedure in a wireless communication system.
  • NR New Radio
  • 5G fifth generation
  • MCS Modulation and Coding Scheme
  • Embodiments of the present invention relate to a user equipment (UE) including a receiver that receives Transmission (Tx) beams from a base station (BS) using Reception (Rx) beams.
  • the UE further includes a processor that allocate consecutive numbers to each of CSI-RS resources that identify each of combinations of the Tx beams and the Rx beams and selects one of the allocated consecutive numbers based on reception quality in each of the CSI- RS resources.
  • the UE further includes a transmitter that transmits, to the BS, feedback information including the one of the allocated consecutive numbers.
  • Embodiments of the present invention relate to a wireless communication method including receiving, with a user equipment (EGE), Transmission (Tx) beams from a base station (BS) using Reception (Rx) beams, allocating, with the UE, consecutive numbers to CST RS resources, respectively, wherein each of the CSI-RS resources identifies each of combinations of the Tx beams and the Rx beams, selecting, with the UE, at least one number of the allocated consecutive numbers based on reception quality in each of the CSI-RS resources, and transmitting, from the UE to the BS, information including the at least one number of the allocated consecutive numbers.
  • EGE user equipment
  • Tx Transmission
  • Rx Reception
  • FIG. 1 is a diagram showing an example of a configuration of a wireless communication system according to one or more embodiments of the present invention.
  • Fig. 2 is a diagram showing P2 beam management scheme according to one or more embodiments.
  • Fig. 3 is a diagram showing P3 beam management scheme according to one or more embodiments.
  • Figs. 4A and 4B are diagrams showing examples where 8 CSI-RS resources are configured as 4 CSI-RS resource sets according to one or more embodiments of the present invention.
  • Figs. 5A and 5B are diagrams showing examples where 8 CSI-RS resources are configured as 4 CSI-RS resource sets according to one or more embodiments of the present invention.
  • Fig. 6 is a diagram showing an example of relationship between a Tx beam, a Rx beam, a CRI, and a BPF according to one or more embodiments of the present invention.
  • Fig. 7 is a diagram showing a schematic configuration of a BS according to embodiments of the present invention.
  • Fig. 8 is a diagram showing a schematic configuration of a UE according to embodiments of the present invention.
  • Fig. 1 is a diagram showing a configuration of a wireless communication system in accordance with one or more embodiments of the present invention.
  • a wireless communication system 1 includes a UE 10 and a TRP 2.
  • the wireless communication system 1 supports beam management and Channel State Information (CSI) acquisition schemes.
  • the wireless communication system 1 may be a NR system.
  • the wireless communication system 1 is not limited to the specific configurations described herein and may be any type of wireless communication system such as a Long Term Evolution (LTE)/LTE- Advanced (LTE-A) system.
  • LTE Long Term Evolution
  • LTE-A LTE-Advance
  • the TRP 20 may communicate uplink (UL) and downlink (DL) signals with the TRP 20.
  • UL uplink
  • DL downlink
  • the DL and UL signals may include control information and user data.
  • the TRP 20 may communicate DL and UL signals with a core network through backhaul links.
  • the TRP 20 may be an example of a base station (BS).
  • the TRP 20 may be referred to as a gNodeB (gNB).
  • gNB gNodeB
  • the TRP may be an evolved NodeB (eNB).
  • eNB evolved NodeB
  • the TRP 20 transmits multiple reference signals using Transmission (Tx) beams #l-#4.
  • the beam may be referred to as a resource.
  • the TRP 20 uses four beams, but the number of Tx beams is not limited thereto.
  • the number of Tx beams may be at least one.
  • the TRP 20 includes antennas, a communication interface to communicate with an adjacent TRP 20 (for example, X2 interface), a communication interface to communicate with the core network (for example, Sl interface), and a CPU (Central Processing Unit) such as a processor or a circuit to process transmitted and received signals with the UE 10.
  • Operations of the TRP 20 may be implemented by the processor processing or executing data and programs stored in a memory.
  • the TRP 20 is not limited to the hardware configuration set forth above and may be realized by other appropriate hardware configurations as understood by those of ordinary skill in the art. Numerous TRPs 20 may be disposed so as to cover a broader service area of the wireless communication system 1.
  • the UE 10 may communicate DL and UL signals that include control information and user data with the TRP 20 using Multi Input Multi Output (MIMO) technology.
  • MIMO Multi Input Multi Output
  • the UE 10 may be a mobile station, a smartphone, a cellular phone, a tablet, a mobile router, or information processing apparatus having a radio communication function such as a wearable device.
  • the wireless communication system 1 may include one or more UEs 10.
  • the UE 10 may receive DL signals use Reception (Rx) beams #1 and #2.
  • Rx Reception
  • the UE 10 includes a CPU such as a processor, a RAM (Random Access
  • the UE 10 may be implemented by the CPU processing or executing data and programs stored in a memory.
  • the UE 10 is not limited to the hardware configuration set forth above and may be configured with, e.g., a circuit to achieve the processing described below.
  • the wireless communication system 1 may support three types of beam management schemes.
  • the three types of beam management schemes may be Pl, P2, and P3 beam management schemes.
  • the P2 beam management scheme is a scheme to select a Tx beam from multiple Tx beams. As shown in Fig. 2, in the P2 beam management scheme, at step S l l, the TRP 20 performs beam sweeping. For example, the TRP 20 transmits Channel State Information-Reference Signals (CSI-RSs) using Tx beams #1-4 by performing beam sweeping.
  • CSI-RSs Channel State Information-Reference Signals
  • the UE 10 receives Tx beams #1-4 using one of Rx beams.
  • the UE 10 receives Tx beams #1-4 using Rx beam #2.
  • the UE 10 may measure reception quality (e.g., Reference Signal Received Power (RSRP) and Received Signal Strength Indicator (RSSI)) for each of Tx beams #1-4.
  • the UE 10 may select a Tx beam from Tx beams #l-#4 based on the measured RSRP. For example, the selected Tx beam has the best reception quality.
  • RSRP Reference Signal Received Power
  • RSSI Received Signal Strength Indicator
  • a table of Fig. 2 shows a CSI-RS resource set for the P2 beam management scheme (P2 CSI-RS resource set) that indicates combinations of Tx beams (e.g., Tx beams #1- 4) and a Rx beam (e.g., Rx beam #2).
  • P2 CSI-RS resource set indicates combinations of Tx beams (e.g., Tx beams #1- 4) and a Rx beam (e.g., Rx beam #2).
  • a resource index identifies each combination of Tx beam and Rx beam.
  • the resource index in the table may be a CRI.
  • the UE 10 transmits, to the TRP 20, feedback information including a CSI-RS Resource Indicator (CRI) and the RSRP of the selected Tx beam.
  • the CRI of the Tx beam identifies each Tx beam used for the CSI-RS transmission.
  • the CRI may be referred to as a beam index.
  • the P3 beam management scheme is a scheme to select a Rx beam from multiple Rx beams. As shown in Fig. 3, in the P3 beam management scheme, at step S21, the UE 10 performs beam sweeping of Rx beams.
  • the UE 10 receives one of Tx beams (e.g., Tx beam #3) using Rx beams #1 and #2 by performing beams sweeping.
  • the UE 10 may measure reception quality (e.g., RSRP and RSSI) for each of Rx beams #1 and #2.
  • the UE 10 may select a Rx beam from Rx beams #1 and #2 based on the measured RSRP. For example, the selected Rx beam has the best reception quality.
  • a table of Fig. 3 shows a CSI-RS resource set for the P3 beam management scheme (P3 CSI-RS resource set) that indicates combinations of a Tx beam (e.g., Tx beam #3) and Rx beams (e.g., Rx beams #1 and #2).
  • a resource index identifies each combination of Tx beam and Rx beam.
  • the resource index in the table may be a CRI.
  • the procedure of beam management can be performed based on other signals such as synchronization signal blocks (SSBs).
  • feedback information can be a SSB resource indicator (SSBRI) associated to index of SSB.
  • SSBRI SSB resource indicator
  • the Pl beam management scheme is a scheme to determine a beam pair link
  • BPL that is a combination of the Tx beam and the Rx beam.
  • consecutive numbers may be allocated to predetermined indexes that are across a plurality of P2 CSI-RS resource sets or P3 CSI-RS resource sets.
  • the predetermined index is an example of an index that identifies each combination of the Tx beam and the Rx beam.
  • Figs. 4A and 4B are tables showing examples where 8 CSI-RS resources are configured as 4 CSI-RS resource sets when repetition of the CSI-RS resource sets is ON.
  • the consecutive numbers for CSI-RS resource may be allocated in the order of the CSI-RS resource within the CSI-RS resource set and the CSI-RS resource set.
  • the consecutive numbers for CSI-RS resource may be allocated in the order of the CSI-RS resource set and the CSI-RS resource within the CSI-RS resource set.
  • the UE 10 may determine a proper CRI from the CRIs to which the consecutive number are allocated based on the reception quality of each of the CSI-RS resources. Then, the UE 10 may transmit feedback information including the determined CRI to the TRP 20.
  • the feedback information may be transmitted as CSI feedback information that may include a Rank Indicator (RI), a Precoding Matrix Indicator (PMI), a Channel Quality Indicator (CQI), the CRI, and the RSRP.
  • RI Rank Indicator
  • PMI Precoding Matrix Indicator
  • CQI Channel Quality Indicator
  • the TRP 20 may notify the UE 10 of the consecutive numbers to be allocated to the CRIs and the UE 10 may allocate the consecutive numbers to the CRIs based on the notification from the TRP 20.
  • the numbers may not be allocated to the CRIs.
  • the UE 10 may notify the TRP 20 of the Tx beam index (or CRI of Tx beam) and the Rx beam index (or CRI of Rx beam).
  • the consecutive numbers may be allocated to predetermined indexes that are across a plurality of P2 CSI-RS resource sets or P3 CSI-RS resource sets.
  • the predetermined index is an example of an index that identifies each combination of the Tx beam and the Rx beam.
  • Figs. 5A and 5B are tables showing examples where two CSI-RS resources are configured as 4 CSI-RS resource sets when repetition of the CSI-RS resource sets is Off.
  • the consecutive numbers for CSI-RS resource may be allocated in the order of the CSI-RS resource within the CSI-RS resource set and the CSI-RS resource set.
  • the consecutive numbers for CSI-RS resource may be allocated in the order of the CSI-RS resource set and the CSI-RS resource within the CSI-RS resource set.
  • the TRP 20 may notify the UE 10 of the consecutive numbers to be allocated to the CRIs and the UE 10 may allocate the consecutive numbers to the CRIs based on the notification from the TRP 20.
  • the numbers may not be allocated to the CRIs.
  • the UE 10 may notify the TRP 20 of the Tx beam index (or CRI of Tx beam) and the Rx beam index (or CRI of Rx beam).
  • the feedback from the UE 10 may not be beam pair link information.
  • the feedback information includes at least one of Tx beam information (e.g., CRI of Tx beam) and Rx beam information.
  • Tx beam information e.g., CRI of Tx beam
  • Rx beam information e.g., Rx beam information
  • the Tx beam may be selected based on a plurality of RSRP values for different Rx beams applied to the same Tx beam.
  • characteristics e.g., reception quality
  • characteristics of Tx beam #1 may be measured using characteristics of BPLn and BPLu.
  • the characteristics of BPLn and BPLn may be averaged to measure characteristics of Tx beam #1.
  • the UE 10 may transmit feedback information including the Tx beam information of the Tx beam corresponding to the BPF having the best characteristics (or the BPFs having best-M characteristics) to select the Tx beam.
  • the Rx beam may be selected based on a plurality of RSRP values for different Tx beams applied to the same Rx beam.
  • characteristics e.g., reception quality
  • characteristics of Rx beam #1 may be measured using characteristics of BPFn, BPF 21 , BPF 31 , and BPF 4 I .
  • the characteristics of BPF 11 , BPF 21 , BPF 31 , and BPF 4 I may be averaged to measure characteristics of Rx beam #1.
  • the UE 10 may transmit feedback information including the Rx beam information of the Rx beam corresponding to the BPF having the best characteristics (or the BPFs having best-M characteristics) to select the Rx beam.
  • designs of signaling e.g., Radio
  • RRC Resource Control
  • Fig. 7 is a diagram illustrating a schematic configuration of the TRP 20 according to embodiments of the present invention.
  • the TRP 20 may include a plurality of antennas (antenna element group) 201, amplifier 202, transceiver (transmitter/receiver) 203, a baseband signal processor 204, a call processor 205 and a transmission path interface 206.
  • User data that is transmitted on the DL from the TRP 20 to the UE 20 is input from the core network, through the transmission path interface 206, into the baseband signal processor 204.
  • PDCP Convergence Protocol
  • RLC Radio Link Control
  • MAC Medium Access Control
  • HARQ transmission processing scheduling, transport format selection, channel coding, inverse fast Fourier transform (IFFT) processing, and precoding processing.
  • HARQ transmission processing scheduling, transport format selection, channel coding, inverse fast Fourier transform (IFFT) processing, and precoding processing.
  • IFFT inverse fast Fourier transform
  • precoding processing precoding processing.
  • the baseband signal processor 204 notifies each UE 10 of control information
  • system information for communication in the cell by higher layer signaling (e.g., Radio Resource Control (RRC) signaling and broadcast channel).
  • RRC Radio Resource Control
  • Information for communication in the cell includes, for example, UL or DL system bandwidth.
  • each transceiver 203 baseband signals that are precoded per antenna and output from the baseband signal processor 204 are subjected to frequency conversion processing into a radio frequency band.
  • the amplifier 202 amplifies the radio frequency signals having been subjected to frequency conversion, and the resultant signals are transmitted from the antennas 201.
  • radio frequency signals are received in each antennas 201, amplified in the amplifier 202, subjected to frequency conversion and converted into baseband signals in the transceiver 203, and are input to the baseband signal processor 204.
  • the baseband signal processor 204 performs FFT processing, IDFT processing, error correction decoding, MAC retransmission control reception processing, and RLC layer and PDCP layer reception processing on the user data included in the received baseband signals. Then, the resultant signals are transferred to the core network through the transmission path interface 206.
  • the call processor 205 performs call processing such as setting up and releasing a communication channel, manages the state of the TRP 20, and manages the radio resources.
  • Fig. 8 is a schematic configuration of the UE 10 according to embodiments of the present invention.
  • the UE 10 has a plurality of UE antenna S 101, amplifiers 102, the circuit 103 comprising transceiver (transmitter/receiver) 1031, the controller 104, and an application 105.
  • transceiver transmitter/receiver
  • radio frequency signals received in the UE antenna S 101 are amplified in the respective amplifiers 102, and subjected to frequency conversion into baseband signals in the transceiver 1031. These baseband signals are subjected to reception processing such as FFT processing, error correction decoding and retransmission control and so on, in the controller 104.
  • the DL user data is transferred to the application 105.
  • the application 105 performs processing related to higher layers above the physical layer and the MAC layer.
  • broadcast information is also transferred to the application 105.
  • UL user data is input from the application 105 to the controller 104.
  • controller 104 retransmission control (Hybrid ARQ) transmission processing, channel coding, precoding, DFT processing, IFFT processing and so on are performed, and the resultant signals are transferred to each transceiver 1031.
  • the transceiver 1031 the baseband signals output from the controller 104 are converted into a radio frequency band. After that, the frequency-converted radio frequency signals are amplified in the amplifier 102, and then, transmitted from the antenna 101.
  • Embodiments of the present invention may be used for each of the uplink and the downlink independently. Embodiments of the present invention may be also used for both of the uplink and the downlink in common.
  • the uplink channel and signal may be replaced with the downlink signal channel and signal.
  • the uplink feedback information (e.g., CSI) may be replaced with the downlink control signal.
  • the present disclosure mainly described examples of a channel and signaling scheme based on NR, the present invention is not limited thereto. Embodiments of the present invention may apply to another channel and signaling scheme having the same functions as NR such as LTE/LTE-A and a newly defined channel and signaling scheme.
  • the present disclosure mainly described examples of technologies related to beam management, beam recovery (e.g., BFR), channel estimation, and CSI feedback (e.g., CSI reporting) schemes based on the CSI-RS
  • the present invention is not limited thereto.
  • Embodiments of the present invention may apply to another synchronization signal, reference signal, and physical channel such as Primary Synchronization Signal/Secondary Synchronization Signal (PSS/SSS) and Demodulation Reference Signal (DM-RS).
  • PSS/SSS Primary Synchronization Signal/Secondary Synchronization Signal
  • DM-RS Demodulation Reference Signal
  • the signaling according to embodiments of the present invention may be higher layer signaling such as RRC signaling and/or lower layer signaling such as Down Link Control Information (DCI) and Media Access Control Control Element (MAC CE). Furthermore, the signaling according to embodiments of the present invention may use a Master Information Block (MIB) and/or a System Information Block (SIB). For example, at least two of the RRC, the DCI, and the MAC CE may be used in combination as the signaling according to embodiments of the present invention.
  • MIB Master Information Block
  • SIB System Information Block
  • the present disclosure mainly described beam management to select good quality beam, e.g., large RSRP, it can be also used for bad quality beams, e.g., small RSRP, RSSI, etc.
  • whether the physical signal/channel is beamformed may be transparent for the UE.
  • the beamformed RS and the beamformed signal may be called the RS and the signal, respectively.
  • the beamformed RS may be referred to as a RS resource.
  • the beam selection may be referred to as resource selection.
  • the Beam Index may be referred to as a resource index (e.g., CRI) or an antenna port index.
  • Embodiments of the present invention may be applied to CSI acquisition, channel sounding, beam management, and other beam control schemes.
  • the frequency (frequency-domain) resource, a Resource Block (RB), and a subcarrier in the present disclosure may be replaced with each other.
  • the time (time-domain) resource, a subframe, a symbol, and a slot may be replaced with each other.

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

Abstract

L'invention concerne un équipement utilisateur (UE) comprenant un récepteur qui reçoit des faisceaux de transmission (Tx) en provenance d'une station de base (BS), au moyen de faisceaux de réception (Rx). L'UE comprend en outre un processeur qui attribue des nombres consécutifs à des ressources de CSI-RS respectivement, chacune des ressources de CSI-RS identifiant chacune de combinaisons des faisceaux Tx et des faisceaux Rx, et sélectionne au moins un nombre des nombres consécutifs attribués sur la base d'une qualité de réception dans chacune des ressources de CSI-RS. L'UE comprend en outre un émetteur qui transmet, à la BS, des informations comprenant le ou les nombres des nombres consécutifs attribués.
PCT/US2019/025946 2018-04-05 2019-04-05 Équipement utilisateur, et procédé de communication sans fil associé WO2019195653A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201862653419P 2018-04-05 2018-04-05
US62/653,419 2018-04-05

Publications (1)

Publication Number Publication Date
WO2019195653A1 true WO2019195653A1 (fr) 2019-10-10

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Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NTT DOCOMO: "Views on NR Beam Management", vol. RAN WG1, no. Reno, USA; 20171127 - 20171201, 18 November 2017 (2017-11-18), XP051370232, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/tsg%5Fran/WG1%5FRL1/TSGR1%5F91/Docs/> [retrieved on 20171118] *

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