WO2023131908A1 - Procédés et appareil de transmission de signal de référence de démodulation (dmrs) - Google Patents

Procédés et appareil de transmission de signal de référence de démodulation (dmrs) Download PDF

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Publication number
WO2023131908A1
WO2023131908A1 PCT/IB2023/050117 IB2023050117W WO2023131908A1 WO 2023131908 A1 WO2023131908 A1 WO 2023131908A1 IB 2023050117 W IB2023050117 W IB 2023050117W WO 2023131908 A1 WO2023131908 A1 WO 2023131908A1
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occ
port
dmrs
antenna ports
frequency domain
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Li Guo
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • 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
    • H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
    • H04L5/0094—Indication of how sub-channels of the path are allocated

Definitions

  • the present disclosure relates to demodulation reference signal (DMRS) transmission. More specifically, systems and methods for enabling DMRS transmission with multiple antenna ports (e.g., up to 24 ports).
  • DMRS demodulation reference signal
  • New Radio (NR) and fifth generation (5G) communication systems support DMRS for physical downlink shared channel (PDSCH) transmission and physical uplink shared channel (PUSCH) transmission.
  • the DMRS of PDSCH can be used by a terminal device (or a user equipment, UE) to obtain a channel estimate for decoding the PDSCH.
  • the DMRS of PUSCH can be used by a base station (i.e. , a “gNB”) to obtain a channel estimate for decoding PUSCH.
  • a base station i.e. , a “gNB”
  • DMRS Type 1 can support up to 4 antenna ports in a single-symbol configuration and up to 8 antenna ports in a two-symbol configuration.
  • DMRS Type 2 can support up to 6 antenna ports in a single-symbol configuration and up to 12 antenna ports in a two-symbol configuration.
  • the drawback of the traditional DMRS designs includes that the number of supported DMRS ports is very limited.
  • DMRSs Demodulation reference signals
  • the DM RS can be used by terminal devices to estimate radio channels.
  • the DM RS can be kept in a scheduled resource and can be transmitted downlink (DL) and/or uplink (UL).
  • the present disclosure is related to systems and methods for enabling DM RS transmission with up to 24 ports.
  • the present technology improves the capability of multi-user MIMO transmission in NR systems and thus boosts the system throughput.
  • a base station e.g., gNB
  • UE terminal device
  • the present technology provides up to 12 antenna ports in a single-symbol configuration and up to 24 antenna ports in a two-symbol configuration.
  • the number of the antenna ports for the singlesymbol configuration and the two-symbol configuration can be different. More particularly, for example, in the configuration of DMRS, the present technology can provide up to 8 antenna ports in a single-symbol configuration and up to 16 antenna ports in a two-symbol configuration.
  • the base station indicates such a DMRS configuration for a PDSCH transmission to a terminal device.
  • the terminal device can be requested to receive the DMRS and then the PDSCH transmission by following the provided DMRS configuration.
  • the base station can also indicate a DMRS configuration a PUSCH transmission and the terminal device can be requested to transmit the DMRS and the corresponding PUSCH transmission by following the provided DMRS configuration.
  • the present technology can significantly increase the maximal number ports of DMRS to 24.
  • Advantages of the present technology include, for example, it can improve an overall system communication capability for multi-user MIMO transmission.
  • the present method can be implemented by a tangible, non-transitory, computer-readable medium having processor instructions stored thereon that, when executed by one or more processors, cause the one or more processors to perform one or more aspects/features of the method described herein.
  • the present method can be implemented by a system comprising a computer processor and a non-transitory computer-readable storage medium storing instructions that when executed by the computer processor cause the computer processor to perform one or more actions of the method described herein.
  • Figs. 1A-1 H are schematic diagrams illustrating mapping relationships among antenna ports of DMRS and corresponding symbols in accordance with one or more implementations of the present disclosure.
  • FIG. 2 is a schematic diagram of a wireless communication system in accordance with one or more implementations of the present disclosure.
  • FIG. 3 is a schematic block diagram of a terminal device in accordance with one or more implementations of the present disclosure.
  • FIG. 4 is a flowchart of a method in accordance with one or more implementations of the present disclosure.
  • Figs. 1A-1 H are schematic diagrams illustrating mapping relationships among antenna ports for DMRS and corresponding symbols/frequencies in accordance with one or more implementations of the present disclosure.
  • Figs. 1 A-1 H include tables 100A-H showing various mapping relationships in time domain (indicated by “symbol index”) and frequency domain (indicated by “resource element (RE) index”).
  • DM RS eight (8) antenna ports of DM RS are mapped to one symbol.
  • Four of those 8 antenna ports e.g., port 2, 3, 10, and 11
  • REs resource elements
  • the other four of those 8 antenna ports e.g., port 0, 1 , 8, and 9 are mapped to even-indexed REs.
  • OCC orthogonal cover code
  • the length-4 OCC can be [+1 +1 , +1 +1], [+1 ,-1 , +1 ,-1], [+1 , +1 , -1 ,-1] and [+1 ,-1 , -1 ,+1],
  • An example of mapping 8 DMRS antenna ports on one symbol is shown in Table 100A in Fig. 1A.
  • Fig. 1A ports 0, 1 , 8 and 9 are mapped all the even- numbered REs in RB #n and RB#n+1.
  • Frequency domain length-4 OCC [+1 , +1 , +1 , +1] is applied on “port 0” in frequency domain on the REs where port 0 is mapped.
  • Frequency domain length-4 OCC [+1 , -1 , +1 , -1] is applied on port 1 in frequency domain on the REs where port 1 is mapped.
  • Frequency domain length-4 OCC [+1 , +1 , -1 , -1] is applied on port 8 in frequency domain on the REs where port 8 is mapped
  • frequency domain length-4 OCC [+1 ,-1 , +1 ,-1] is applied on port 9 in frequency domain on the REs where port 9 is mapped.
  • Frequency domain length-4 OCC [+1 , +1 , +1 , +1] is applied on port 2 in frequency domain on the REs where port 2 is mapped.
  • Frequency domain length-4 OCC [+1 , -1 , +1 , -1] is applied on port 3 in frequency domain on the REs where port 3 is mapped.
  • Frequency domain length-4 OCC [+1 , +1 , -1 , -1] is applied on port 10 in frequency domain on the REs where port 10 is mapped and frequency domain length- 4 OCC [+1 ,-1 ,+1 ,-1] is applied on port 11 in frequency domain on the REs where port 11 is mapped.
  • a length-4 OCC is applied in frequency domain and a length-2 OCC is applied in time domain.
  • the length-4 OCC in frequency domain can be [+1 ,+1 ,+1 ,+1], [+1 ,-1 , +1 ,-1], [+1 , +1 , - 1 ,-1] and [+1 ,-1 , -1 +1].
  • the length-2 OCC in time domain can be [+1 ,+1] and [+1 , , -2],
  • the ports 0 ⁇ 15 can be mapped to two symbols k and k+1 and two RBs #n and #n+1 as follows:
  • Ports “0, 1 , 4, 5, 8, 9, 12, 13” are mapped all the even-numbered REs in RB #n and RB#n+1 on symbols k and k+1. More particularly, frequency domain length-4 OCC [+1 , +1 ,+1 ,+1] is applied on port 0 on the REs where port 0 is mapped and time domain length-2 OCC [+1 , +1] is applied on port 0 on symbols k and k+1. Frequency domain length-4 OCC [+1 , -1 ,+1 ,-1] is applied on port 1 on the REs where port 1 is mapped and time domain length-2 OCC [+1 , +1] is applied on port 1 on symbols k and k+1.
  • Frequency domain length-4 OCC [+1 , +1 ,-1 ,-1] is applied on port 8 on the REs where port 8 is mapped and time domain length-2 OCC [+1 , +1] is applied on port 8 on symbols k and k+1.
  • Frequency domain length-4 OCC [+1 , -1 ,-1 , +1] is applied on port 9 on the REs where port 9 is mapped and time domain length-2 OCC [+1 , +1] is applied on port 9 on symbols k and k+1.
  • frequency domain length-4 OCC [+1 , +1 ,+1 ,+1] is applied on port 4 on the REs where port 4 is mapped and time domain length-2 OCC [+1 , -1] is applied on port 4 on symbols k and k+1.
  • Frequency domain length-4 OCC [+1 , -1 ,+1 ,-1 ] is applied on port 5 on the REs where port 5 is mapped and time domain length-2 OCC [+1 , -1] is applied on port 5 on symbols k and k+1.
  • Frequency domain length-4 OCC [+1 , +1 ,-1 ,-1] is applied on port 12 on the REs where port 12 is mapped and time domain length-2 OCC [+1 , -1] is applied on port 12 on symbols k and k+1.
  • Frequency domain length-4 OCC [+1 , -1 ,-1 , +1] is applied on port 13 on the REs where port 13 is mapped and time domain length-2 OCC [+1 , -1] is applied on port 13 on symbols k and k+1.
  • Ports “2, 3, 6, 7, 10, 11 , 14, 15” are mapped all the odd-numbered REs in RB #n and RB#n+1 on symbols k and k+1.
  • Frequency domain length-4 OCC [+1 , +1 +1 +1] is applied on port 2 on the REs where port 2 is mapped and time domain length-2 OCC [+1 , +1] is applied on port 2 on symbols k and k+1 .
  • Frequency domain length-4 OCC [+1 , -1 ,+1 ,-1] is applied on port 3 on the REs where port 3 is mapped and time domain length-2 OCC [+1 , +1] is applied on port 3 on symbols k and k+1.
  • Frequency domain length-4 OCC [+1 , +1 ,-1 ,-1] is applied on port 10 on the REs where port 10 is mapped and time domain length-2 OCC [+1 , +1] is applied on port 10 on symbols k and k+1.
  • frequency domain length-4 OCC [+1 , -1 ,-1 , +1] is applied on port 11 on the REs where port 11 is mapped and time domain length-2 OCC [+1 , +1] is applied on port 11 on symbols k and k+1 .
  • Frequency domain length- 4 OCC [+1 , +1 ,+1 ,+1 ] is applied on port 6 on the REs where port 6 is mapped and time domain length-2 OCC [+1 , -1] is applied on port 6 on symbols k and k+1.
  • Frequency domain length-4 OCC [+1 , -1 ,+1 ,-1] is applied on port 7 on the REs where port 7 is mapped and time domain length-2 OCC [+1 , -1] is applied on port 7 on symbols k and k+1.
  • Frequency domain length-4 OCC [+1 , +1 ,-1 ,-1] is applied on port 14 on the REs where port 14 is mapped and time domain length-2 OCC [+1 , -1] is applied on port 14 on symbols k and k+1.
  • Frequency domain length-4 OCC [+1 , -1 ,-1 +1] is applied on port 15 on the REs where port 15 is mapped and time domain length-2 OCC [+1 , -1] is applied on port 15 on symbols k and k+1 .
  • a base station can indicate a second configuration of DMRS to a terminal device.
  • the second configuration of DMRS there can be up to 12 antenna ports in a single-symbol configuration and there could be up to 24 antenna ports in a two-symbol configuration.
  • those 12 ports can be partitioned into three groups.
  • the ports in different groups can be mapped to different REs in frequency domain.
  • a length-4 OCC can be applied on each port in frequency domain.
  • those 24 ports can be partitioned into three groups.
  • the ports in different groups are mapped to different REs in frequency domain. With each group, a length-4 OCC is applied on each port in frequency domain and a length-2 OCC is applied on each port in time domain.
  • twelve (12) antenna ports of DMRS are mapped to one symbol.
  • the 12 antenna ports are partitioned into 3 groups.
  • the first group of antenna ports are mapped to REs “0,1 ,6 and 7” in a resource block (RB).
  • the second group of antenna ports are mapped to REs “2, 3, 8 and 9” in an RB and the third group of antenna ports are mapped to REs “4, 5, 10 and 11” in an RB.
  • a length-4 OCC is applied on the REs in frequency domain.
  • the length-4 OCC can [0029] More particularly, ports “0, 1 , 12 and 13” are mapped on REs “0, 1 , 6 and 7” in an RB.
  • Frequency domain length-4 OCC [+1 , +1 , +1 , +1] is applied on port 0 in frequency domain on the REs where port 0 is mapped.
  • Frequency domain length-4 OCC [+1 , -1 , +1 , -1] is applied on port 1 in frequency domain on the REs where port 1 is mapped.
  • Frequency domain length-4 OCC [+1 , +1 , -1 , -1] is applied on port 12 in frequency domain on the REs where port 12 is mapped.
  • Frequency domain length-4 OCC [+1 , -1 , +1 , -1] is applied on port 13 in frequency domain on the REs where port 13 is mapped.
  • Ports “2, 3, 14 and 15” are mapped on REs “2, 3, 8 and 9” in an RB.
  • Frequency domain length-4 OCC [+1 , +1 , +1 , +1] is applied on port 2 in frequency domain on the REs where port 2 is mapped.
  • Frequency domain length-4 OCC [+1 , - 1 , +1 , -1] is applied on port 3 in frequency domain on the REs where port 3 is mapped.
  • Frequency domain length-4 OCC [+1 , +1 , -1 , -1] is applied on port 14 in frequency domain on the REs where port 14 is mapped.
  • Frequency domain length-4 OCC [+1 , -1 , +1 , -1] is applied on port 15 in frequency domain on the REs where port 15 is mapped.
  • Ports “4, 5, 16 and 17” are mapped on REs “4, 5, 10 and 11” in an RB.
  • Frequency domain length-4 OCC [+1 , +1 , +1 , +1] is applied on port 4 in frequency domain on the REs where port 4 is mapped.
  • Frequency domain length-4 OCC [+1 , - 1 , +1 , -1] is applied on port 5 in frequency domain on the REs where port 5 is mapped.
  • Frequency domain length-4 OCC [+1 , +1 , -1 , -1] is applied on port 16 in frequency domain on the REs where port 16 is mapped.
  • Frequency domain length-4 OCC [+1 , -1 , +1 , -1] is applied on port 17 in frequency domain on the REs where port 17 is mapped.
  • twenty-four (24) antenna ports of DMRS can be mapped to two symbols.
  • the 24 antenna ports are partitioned into 3 groups.
  • the first group of antenna ports are mapped to REs “0,1 ,6 and 7” in an RB on both symbols.
  • the second group of antenna ports are mapped to REs “2, 3, 8 and 9” in an RB on both symbols.
  • the third group of antenna ports can be mapped to REs “4, 5, 10 and 11” in an RB on both symbols.
  • a length-4 OCC is applied on the REs in frequency domain and a length-2 OCC is applied on those two symbols in time domain.
  • the length-4 OCC can be [+1, +1, +1, +1], [+1, -1, +1, -1], [+1, +1, -1, -1] and [+1, -1, -1, +1],
  • the length-2 OCC can be [+1, +1] and [+1, -1], More particularly, the ports can be arranged as follows:
  • Ports “0, 1, 12 and 13 and 6, 7, 18 and 19” are mapped on REs “0, 1, 6 and 7” in an RB.
  • Frequency domain length-4 OCC [+1, +1, +1, +1] is applied on port 0 in frequency domain on the REs where port 0 is mapped and a length-2 OCC [+1, +1] is applied on port 0 on two symbols in time domain.
  • Frequency domain length-4 OCC [+1, -1, +1, -1] is applied on port 1 in frequency domain on the REs where port 1 is mapped and a length-2 OCC [+1, +1] is applied on port 1 on two symbols in time domain.
  • Frequency domain length-4 OCC [+1, +1, -1, -1] is applied on port 12 in frequency domain on the REs where port 12 is mapped and a length-2 OCC [+1, +1] is applied on port 12 on two symbols in time domain.
  • Frequency domain length-4 OCC [+1, -1, +1, -1] is applied on port 13 in frequency domain on the REs where port 13 is mapped and a length-2 OCC [+1, +1] is applied on port 13 on two symbols in time domain.
  • Frequency domain length-4 OCC [+1, +1, +1, +1] is applied on port 6 in frequency domain on the REs where port 6 is mapped and a length-2 OCC [+1, -1] is applied on port 6 on two symbols in time domain.
  • Frequency domain length-4 OCC [+1, -1, +1, -1] is applied on port 7 in frequency domain on the REs where port 7 is mapped and a length-2 OCC [+1, -1] is applied on port 7 on two symbols in time domain.
  • Frequency domain length-4 OCC [+1, +1, -1, -1] is applied on port 18 in frequency domain on the REs where port 18 is mapped and a length-2 OCC [+1, -1] is applied on port 18 on two symbols in time domain.
  • Frequency domain length-4 OCC [+1, -1, +1, -1] is applied on port 19 in frequency domain on the REs where port 19 is mapped and a length-2 OCC [+1, -1] is applied on port 19 on two symbols in time domain.
  • Ports “2, 3, 14 and 15, 8, 9, 20 and 21” are mapped on REs “2, 3, 8 and 9” in an RB.
  • Frequency domain length-4 OCC [+1, +1, +1, +1] is applied on port 2 in frequency domain on the REs where port 2 is mapped and a length-2 OCC [+1 , +1] is applied on port 2 on two symbols in time domain.
  • Frequency domain length-4 OCC [+1, -1, +1, -1] is applied on port 3 in frequency domain on the REs where port 3 is mapped and a length-2 OCC [+1, +1] is applied on port 3 on two symbols in time domain.
  • Frequency domain length-4 OCC [+1, +1, -1, -1] is applied on port 14 in frequency domain on the REs where port 14 is mapped and a length-2 OCC [+1 , +1] is applied on port 14 on two symbols in time domain.
  • Frequency domain length-4 OCC [+1 , -1 , +1 , -1] is applied on port 15 in frequency domain on the REs where port 15 is mapped and a length-2 OCC [+1 , +1] is applied on port 15 on two symbols in time domain.
  • Frequency domain length-4 OCC [+1 , +1 , +1 , +1] is applied on port 8 in frequency domain on the REs where port 8 is mapped in frequency domain and a length-2 OCC [+1 , -1] is applied on port 8 on two symbols in time domain.
  • Frequency domain length-4 OCC [+1 , -1 , +1 , -1] is applied on port 9 in frequency domain on the REs where port 9 is mapped and a length-2 OCC [+1 , -1] is applied on port 9 on two symbols in time domain.
  • Frequency domain length-4 OCC [+1 , +1 , -1 , -1] is applied on port 20 in frequency domain on the REs where port 20 is mapped and a length-2 OCC [+1 , -1] is applied on port 18 on two symbols in time domain.
  • Frequency domain length-4 OCC [+1 , -1 , +1 , -1] is applied on port 21 and a length-2 OCC [+1 , -1] is applied on port 21 on two symbols in time domain.
  • Ports “4, 5, 16 and 17, 10, 11 , 22 and 23” are mapped on REs 4, 5, 10 and 11 in an RB.
  • Frequency domain length-4 OCC [+1 , +1 , +1 , +1] is applied on port 4 in frequency domain on the REs where port 4 is mapped and a length-2 OCC [+1 , +1] is applied on port 4 on two symbols in time domain.
  • Frequency domain length-4 OCC [+1 , -1 , +1 , -1] is applied on port 5 in frequency domain on the REs where port 5 is mapped and a length-2 OCC [+1 , +1] is applied on port 5 on two symbols in time domain.
  • Frequency domain length-4 OCC [+1 , +1 , -1 , -1] is applied on port 16 in frequency domain on the REs where port 16 is mapped and a length-2 OCC [+1 , +1] is applied on port 16 on two symbols in time domain.
  • Frequency domain length-4 OCC [+1 , -1 , +1 , -1] is applied on port 17 in frequency domain on the REs where port 17 is mapped and a length-2 OCC [+1 , +1] is applied on port 17 on two symbols in time domain.
  • Frequency domain length-4 OCC [+1 , +1 , +1 , +1] is applied on port 10 in frequency domain on the REs where port 10 is mapped in frequency domain and a length-2 OCC [+1 , -1] is applied on port 10 on two symbols in time domain.
  • Frequency domain length-4 OCC [+1 , -1 , +1 , -1] is applied on port 11 in frequency domain on the REs where port 11 is mapped and a length-2 OCC [+1 , -1] is applied on port 11 on two symbols in time domain.
  • Frequency domain length-4 OCC [+1 , +1 , -1 , -1] is applied on port 22 in frequency domain on the REs where port 22 is mapped and a length-2 OCC [+1 , -1] is applied on port 22 on two symbols in time domain.
  • Frequency domain length-4 OCC [+1 , -1 , +1 , -1] is applied on port 23 in frequency domain on the REs where port 23 is mapped and a length-2 OCC [+1 , -1] is applied on port 23 on two symbols in time domain.
  • the ports can be arranged such that one single RE corresponds to one port.
  • twelve (12) antenna ports of DM RS are mapped to one symbol and those 12 antenna ports are mapped to different resource elements on the same symbol.
  • Twenty four (24) antenna ports of DM RS can be mapped to two symbols. Each two antenna ports are mapped to one resource element on those two symbols and these two antenna ports are applied with different length-2 OCC
  • DM RS port 0 is mapped on RE #0 in one physical resource block (PRB) on one symbol.
  • DMRS port 1 is mapped on RE #1 in one PRB on one symbol.
  • DMRS port 2 is mapped on RE #2 in one PRB on one symbol.
  • DMRS port 3 is mapped on RE #3 in one PRB on one symbol.
  • DMRS port 4 is mapped on RE #4 in one PRB on one symbol.
  • DMRS port 5 is mapped on RE #5 in one PRB on one symbol.
  • DMRS port 6 is mapped on RE #6 in one PRB on one symbol.
  • DMRS port 7 is mapped on RE #7 in one PRB on one symbol.
  • DMRS port 8 is mapped on RE #8 in one PRB on one symbol.
  • DMRS port 9 is mapped on RE #9 in one PRB on one symbol.
  • DMRS port 10 is mapped on RE #10 in one PRB on one symbol.
  • DMRS port 11 is mapped on RE #11 in one PRB on one symbol.
  • Table 100D in Fig. 1 D shows examples of mapping 24 DMRS antenna ports on two symbols.
  • DMRS ports 0 and 12 are mapped on RE #0 in one PRB on two symbols.
  • OCC [+1 , +1] is applied for DMRS port 0
  • OCC [+1 , -1] is applied for DMRS port 12.
  • DMRS ports 1 and 13 is mapped on RE #1 in one PRB on two symbols.
  • OCC [+1 , +1] is applied for DMRS port 1
  • OCC [+1 , -1] is applied for DMRS port 13.
  • DMRS ports 2 and 14 is mapped on RE #2 in one PRB on two symbols.
  • OCC [+1 , +1] is applied for DMRS port 2 and OCC [+1 , -1] is applied for DMRS port 14.
  • DMRS ports 3 and 15 is mapped on RE #3 in one PRB on two symbols.
  • OCC [+1 , +1] is applied for DMRS port 3 and OCC [+1 , -1] is applied for DMRS port 15.
  • DMRS ports 4 and 16 is mapped on RE #4 in one PRB on two symbols.
  • OCC [+1 , +1] is applied for DMRS port 4 and OCC [+1 , -1] is applied for DMRS port 16.
  • DMRS ports 5 and 17 is mapped on RE #5 in one PRB on two symbols.
  • OCC [+1 , +1] is applied for DMRS port 5 and OCC [+1 , -1] is applied for DMRS port 17.
  • DMRS ports 6 and 18 is mapped on RE #6 in one PRB on two symbols. On two symbols, OCC [+1 , +1] is applied for DMRS port 6 and OCC [+1 , -1] is applied for DMRS port 18.
  • DMRS ports 7 and 19 is mapped on RE #7 in one PRB on two symbols. On two symbols, OCC [+1 , +1] is applied for DMRS port 7 and OCC [+1 , -1] is applied for DMRS port 19.
  • DMRS ports 8 and 20 is mapped on RE #8 in one PRB on two symbols. On two symbols, OCC [+1 , +1] is applied for DMRS port 8 and OCC [+1 , -1] is applied for DMRS port 20.
  • DMRS ports 9 and 21 is mapped on RE #9 in one PRB on two symbols. On two symbols, OCC [+1 , +1] is applied for DMRS port 9 and OCC [+1 , -1] is applied for DMRS port 21.
  • DMRS ports 10 and 22 is mapped on RE #10 in one PRB on two symbols. On two symbols, OCC [+1 , +1] is applied for DMRS port 10 and OCC [+1 , -1] is applied for DMRS port 22.
  • DMRS ports 11 and 23 is mapped on RE #11 in one PRB on two symbols. On two symbols, OCC [+1 , +1] is applied for DMRS port 11 and OCC [+1 , -1] is applied for DMRS port 23.
  • table 100E illustrates embodiments of mapping 12 DMRS antenna ports on one symbol.
  • 12 antenna ports of DMRS are mapped to one symbol and each two of those 12 antenna ports are mapped to same resource elements on the same symbol.
  • a length-2 OCC is applied along frequency domain on each antenna port to orthogonalize those two antenna ports that are mapped on same REs.
  • 24 antenna ports of DMRS are mapped to two symbols.
  • Each four antenna ports are mapped to same resource elements on those two symbols and these four antenna ports are applied with different length-4 OCC along both time domain and frequency domain.
  • different length-2 OCC is applied along frequency domain and different length-2 OCC is applied along time domain on each antenna port.
  • DMRS ports 0 and 1 are mapped on REs #0 and #1 in one PRB on one symbol.
  • OCC [+1 , +1] is applied for DMRS port 0
  • OCC [+1 , -1] is applied for DMRS port 1.
  • DMRS ports 2 and 3 are mapped on REs #2 and #3 in one PRB on one symbol.
  • OCC [+1 , +1] is applied for DMRS port 2 and OCC [+1 , -1] is applied for DMRS port 3.
  • DMRS ports 4 and 5 are mapped on REs #4 and #5 in one PRB on one symbol.
  • OCC [+1 , +1] is applied for DMRS port 4 and OCC [+1 , -1] is applied for DMRS port 5.
  • DMRS ports 6 and 7 are mapped on REs #6 and #7 in one PRB on one symbol.
  • OCC [+1 , +1] is applied for DMRS port 6 and OCC [+1 , -1] is applied for DMRS port 7.
  • DMRS ports 8 and 9 are mapped on REs #8 and #9 in one PRB on one symbol.
  • OCC [+1 , +1] is applied for DMRS port 8 and OCC [+1 , -1] is applied for DMRS port 9.
  • DMRS ports 10 and 11 are mapped on REs #0 and #1 in one PRB on one symbol.
  • OCC [+1 , +1] is applied for DMRS port 10 and OCC [+1 , -1] is applied for DMRS port 11.
  • table 100F illustrates embodiments of mapping 24 DMRS antenna ports on one symbol.
  • DMRS ports 0, 1 , 12 and 13 are mapped on REs #0 and #1 in one PRB on two symbols.
  • OCC [+1 , +1 , +1 , +1] is applied for DMRS port 0
  • OCC [+1 , - 1 , +1 , -1] is applied for DMRS port 1
  • OCC [+1 , +1 , -1 , -1] is applied for DMRS port 12
  • OCC [+1 , -1 , -1 , +1] is applied for DMRS port 13.
  • OCC [+1 , +1] is applied along frequency domain and OCC [+1 , +1] is applied along time domain for DMRS port 0
  • OCC [+1 , -1] is applied along frequency domain and OCC [+1 , +1] is applied along time domain for DMRS port 1
  • OCC [+1 , +1] is applied along frequency domain and OCC [+1 , -1] is applied along time domain for DMRS port 12
  • OCC [+1 , -1] is applied along frequency domain and OCC [+1 , -1] is applied along time domain for DMRS port 13.
  • DMRS ports “2, 3, 14 and 15” are mapped on REs #2 and #3 in one PRB on two symbols.
  • OCC [+1 , +1 , +1 , +1] is applied for DMRS port 2
  • OCC [+1 , -1 , +1 , -1] is applied for DMRS port 3
  • OCC [+1 , +1, -1, - 1] is applied for DMRS port 14
  • OCC [+1 , -1 , -1 , +1] is applied for DMRS port 15.
  • OCC [+1 , +1] is applied along frequency domain and OCC [+1 , +1] is applied along time domain for DMRS port 2
  • OCC [+1 , -1] is applied along frequency domain and OCC [+1 , +1] is applied along time domain for DMRS port 3
  • OCC [+1 , +1] is applied along frequency domain and OCC [+1 , -1] is applied along time domain for DMRS port 14
  • OCC [+1, -1] is applied along frequency domain and OCC [+1, -1] is applied along time domain for DMRS port 15.
  • DMRS ports “4, 5, 16 and 17” are mapped on REs #4 and #5 in one PRB on two symbols.
  • OCC [+1 , +1 , +1 , +1] is applied for DMRS port 4
  • OCC [+1, -1, +1, -1] is applied for DMRS port 5
  • OCC [+1, +1,-1,- 1] is applied for DMRS port 16
  • OCC [+1, -1,-1, +1] is applied for DMRS port 17.
  • OCC [+1, +1] is applied along frequency domain and OCC [+1, +1] is applied along time domain for DMRS port 4
  • OCC [+1, -1] is applied along frequency domain and OCC [+1, +1] is applied along time domain for DMRS port 5
  • OCC [+1, +1] is applied along frequency domain and OCC [+1, -1] is applied along time domain for DMRS port 16
  • OCC [+1, -1] is applied along frequency domain and OCC [+1, -1] is applied along time domain for DMRS port 17.
  • DMRS ports 6, 7, 18 and 19 are mapped on REs #6 and #7 in one PRB on two symbols.
  • OCC [+1, +1, +1, +1] is applied for DMRS port 6
  • OCC [+1, -1, +1, -1] is applied for DMRS port 7
  • OCC [+1, +1, -1, -1] is applied for DMRS port 18
  • OCC [+1, -1, -1, +1] is applied for DMRS port 19.
  • OCC [+1, +1] is applied along frequency domain and OCC [+1, +1] is applied along time domain for DMRS port 6
  • OCC [+1, -1] is applied along frequency domain and OCC [+1, +1] is applied along time domain for DMRS port 7
  • OCC [+1, +1] is applied along frequency domain and OCC [+1, -1] is applied along time domain for DMRS port 18
  • OCC [+1, -1] is applied along frequency domain and OCC [+1, -1] is applied along time domain for DMRS port 19.
  • DMRS ports “8, 9, 20 and 21” are mapped on REs #8 and #9 in one PRB on two symbols.
  • OCC [+1 , +1 , +1 , +1] is applied for DMRS port 8
  • OCC [+1, -1, +1, -1] is applied for DMRS port 9
  • OCC [+1, +1,-1, -1] is applied for DMRS port 20
  • OCC [+1, -1,-1, +1] is applied for DMRS port 21.
  • OCC [+1, +1] is applied along frequency domain and OCC [+1, +1] is applied along time domain for DMRS port 8
  • OCC [+1, -1] is applied along frequency domain and OCC [+1, +1] is applied along time domain for DMRS port 9
  • OCC [+1, +1] is applied along frequency domain and OCC [+1, -1] is applied along time domain for DMRS port 20
  • OCC [+1, -1] is applied along frequency domain and OCC [+1, -1] is applied along time domain for DMRS port 21.
  • DMRS ports “10, 11, 22 and 23” are mapped on REs #10 and #11 in one PRB on two symbols.
  • OCC [+1, +1, +1, +1] is applied for DMRS port 10
  • OCC [+1, -1, +1, -1] is applied for DMRS port 11
  • OCC [+1, +1, -1, -1] is applied for DMRS port 22
  • OCC [+1, -1, -1, +1] is applied for DMRS port 23.
  • OCC [+1, +1] is applied along frequency domain and OCC [+1 , +1] is applied along time domain for DMRS port 10
  • OCC [+1 , -1] is applied along frequency domain and OCC [+1, +1] is applied along time domain for DMRS port 11
  • OCC [+1, +1] is applied along frequency domain and OCC [+1, -1] is applied along time domain for DMRS port 22
  • OCC [+1, -1] is applied along frequency domain and OCC [+1 , -1] is applied along time domain for DMRS port 23.
  • Table 100G illustrates embodiments of mapping 12 DMRS antenna ports on one symbol.
  • 12 antenna ports of DMRS are mapped to one symbol and each four of those 12 antenna ports are mapped to same 4 resource elements in one PRB on one symbol.
  • a length-4 OCC is applied along frequency domain on each antenna port to orthogonalize those four antenna ports that are mapped on same REs.
  • 24 antenna ports of DMRS are mapped to two symbols. Each eight antenna ports are mapped to same resource elements on those two symbols and these eight antenna ports are applied with different length-4 OCC along frequency domain and different length-2 OCC along time domain.
  • DMRS ports “0, 1, 2 and 3” are mapped on REs ⁇ #0, #1, #2, #3 ⁇ in one PRB on one symbol.
  • OCC [+1, +1, +1, +1] is applied on DMRS port 0
  • OCC [+1, -1, +1, -1] is applied for DMRS port 1
  • OCC [+1 , +1 , -1 , -1] is applied for DMRS port 2
  • OCC [+1 , -1 , -1 , -1] is applied for DMRS port 3.
  • DMRS ports “4, 5, 6 and 7” are mapped on REs ⁇ #4, #5, #6, #7 ⁇ in one PRB on one symbol.
  • OCC [+1, +1, +1, +1] is applied on DMRS port 4
  • OCC [+1, -1, +1, -1] is applied for DMRS port 5
  • OCC [+1, +1,-1,- 1] is applied for DMRS port 6
  • OCC [+1 , -1 , -1 , -1] is applied for DMRS port 7.
  • DMRS ports “8, 9, 10 and 11” are mapped on REs ⁇ #8, #9, #10, #11 ⁇ in one PRB on one symbol.
  • OCC [+1, +1, +1, +1] is applied on DMRS port 8
  • OCC [+1, -1, +1, -1] is applied for DMRS port 9
  • OCC [+1, +1,-1,- 1] is applied for DMRS port 10
  • OCC [+1, -1, -1, -1] is applied for DMRS port 11.
  • Table 100H illustrates embodiments of mapping 24 DM RS antenna ports on two symbols.
  • DM RS ports “0, 1, 2, 3, 12, 13, 14 and 15” are mapped on REs ⁇ #0, #1, #2, #3 ⁇ in one PRB in two symbols.
  • OCC [+1, +1, +1, +1] is applied on DMRS ports 0 and along time domain OCC [+1 , +1] is applied on DMRS port 0.
  • OCC [+1, -1, +1, -1] is applied on DMRS ports 1 and along time domain OCC [+1, +1] is applied on DMRS port 1.
  • OCC [+1, +1,-1, -1] is applied on DMRS ports 2 and along time domain OCC [+1 , +1] is applied on DMRS port 0.
  • OCC [+1, -1, -1, +1] is applied on DMRS ports 3 and along time domain OCC [+1 , +1] is applied on DMRS port 3.
  • OCC [+1 , +1 , +1 , +1] is applied on DMRS ports 12 and along time domain OCC [+1 , -1] is applied on DMRS port 12.
  • OCC [+1 , -1 , +1 , -1] is applied on DMRS ports 13 and along time domain OCC [+1, -1] is applied on DMRS port 13.
  • OCC [+1, +1, -1, -1] is applied on DMRS ports 14 and along time domain OCC [+1, -1] is applied on DMRS port 14.
  • OCC [+1, -1,-1, +1] is applied on DMRS ports 15 and along time domain OCC [+1, -1] is applied on DMRS port 15.
  • DMRS ports “4, 5, 6, 7, 16, 17, 18 and 19” are mapped on REs ⁇ #4, #5, #6, #7 ⁇ in one PRB in two symbols.
  • OCC [+1, +1, +1, +1] is applied on DMRS ports 4 and along time domain OCC [+1, +1] is applied on DMRS port 4.
  • OCC [+1 , -1 , +1 , -1] is applied on DMRS ports 5 and along time domain OCC [+1 , +1] is applied on DMRS port 5.
  • OCC [+1, +1,-1, -1] is applied on DMRS ports 6 and along time domain OCC [+1, +1] is applied on DMRS port 6.
  • OCC [+1, -1, -1, +1] is applied on DMRS ports 7 and along time domain OCC [+1, +1] is applied on DMRS port 7.
  • OCC [+1, +1, +1, +1] is applied on DMRS ports 16 and along time domain OCC [+1, -1] is applied on DMRS port 16.
  • OCC [+1, -1, +1, -1] is applied on DMRS ports 17 and along time domain OCC [+1, -1] is applied on DMRS port 17.
  • OCC [+1, +1,-1, -1] is applied on DMRS ports 18 and along time domain OCC [+1, -1] is applied on DMRS port 18.
  • OCC [+1, -1,-1, +1] is applied on DMRS ports 19 and along time domain OCC [+1, -1] is applied on DMRS port 19.
  • DMRS ports ⁇ 8, 9, 10, 11, 20, 21 , 22 and 23 ⁇ are mapped on REs ⁇ #8, #9, #10, #11 ⁇ in one PRB in two symbols.
  • OCC [+1 , +1 , +1 , +1] is applied on DMRS ports 8 and along time domain OCC [+1 , +1] is applied on DMRS port 8.
  • OCC [+1 , -1 , +1 , -1] is applied on DMRS ports 9 and along time domain OCC [+1 , +1] is applied on DMRS port 9.
  • OCC [+1 , +1 , -1 , -1] is applied on DMRS ports 10 and along time domain OCC [+1 , +1] is applied on DMRS port 10.
  • OCC [+1 , -1 , -1 , +1] is applied on DMRS ports 11 and along time domain OCC [+1 , +1] is applied on DMRS port 11.
  • OCC [+1 , +1 , +1 , +1] is applied on DMRS ports 20 and along time domain OCC [+1 , - 1] is applied on DMRS port 20.
  • OCC [+1 , -1 , +1 , -1] is applied on DMRS ports 21 and along time domain OCC [+1 , -1] is applied on DMRS port 21.
  • OCC [+1 , +1 , -1 , -1] is applied on DMRS ports 22 and along time domain OCC [+1 , -1] is applied on DMRS port 22.
  • OCC [+1 , -1 , -1 , +1] is applied on DMRS ports 23 and along time domain OCC [+1 , -1] is applied on DMRS port 23.
  • Fig. 2 is a schematic diagram of a wireless communication system 200 in accordance with one or more implementations of the present disclosure.
  • the wireless communication system 200 can implement the communications methods discussed herein by using the configurations of DMRS discussed with reference to Figs. 1A-1 H.
  • the wireless communications system 200 includes a network device (or base station/cell) 201.
  • the network device 201 include a base transceiver station (Base Transceiver Station, BTS), a NodeB (NodeB, NB), an evolved Node B (eNB or eNodeB), a Next Generation NodeB (gNB or gNode B), a Wireless Fidelity (Wi-Fi) access point (AP), etc.
  • BTS Base Transceiver Station
  • NodeB NodeB
  • eNB or eNodeB evolved Node B
  • gNB or gNode B Next Generation NodeB
  • Wi-Fi Wireless Fidelity
  • the network device 201 can include a relay station, an access point, an in-vehicle device, a wearable device, and the like.
  • the network device 201 can include wireless connection devices for communication networks such as: a Global System for Mobile Communications (GSM) network, a Code Division Multiple Access (CDMA) network, a Wideband CDMA (WCDMA) network, an LTE network, a cloud radio access network (Cloud Radio Access Network, CRAN), an Institute of Electrical and Electronics Engineers (IEEE) 802.11-based network (e.g., a Wi-Fi network), an Internet of Things (loT) network, a device-to-device (D2D) network, a next-generation network (e.g., a 5G network), a future evolved public land mobile network (Public Land Mobile Network, PLMN), or the like.
  • a 5G system or network can be referred to as an NR system or network.
  • the wireless communications system 200 also includes a terminal device 203.
  • the terminal device 203 can be an end-user device configured to facilitate wireless communication.
  • the terminal device 203 can be configured to wirelessly connect to the network device 201 (via, e.g., via a wireless channel 205) according to one or more corresponding communication protocols/standards.
  • the terminal device 203 may be mobile or fixed.
  • the terminal device 203 can be a user equipment (UE), an access terminal, a user unit, a user station, a mobile site, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communications device, a user agent, or a user apparatus.
  • UE user equipment
  • Examples of the terminal device 203 include a modem, a cellular phone, a smartphone, a cordless phone, a Session Initiation Protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device having a wireless communication function, a computing device or another processing device connected to a wireless modem, an in-vehicle device, a wearable device, an Internet- of-Things (loT) device, a device used in a 5G network, a device used in a public land mobile network, or the like.
  • Fig. 2 illustrates only one network device 201 and one terminal device 203 in the wireless communications system 200. However, in some instances, the wireless communications system 200 can include additional network device 201 and/or terminal device 203.
  • the network device 201 can indicate a DMRS configuration (e.g., those discussed with reference to Figs. 1A-1 H) for a PDSCH transmission to the terminal device 203.
  • the terminal device 203 can be requested to receive the DMRS and then the PDSCH transmission by following the provided DMRS configuration.
  • Fig. 3 is a schematic block diagram of a terminal device 203 (e.g., which can implement the methods discussed herein) in accordance with one or more implementations of the present disclosure.
  • the terminal device 203 includes a processing unit 310 (e.g., a DSP, a CPU, a GPU, etc.) and a memory 320.
  • the processing unit 310 can be configured to implement instructions that correspond to the methods discussed herein and/or other aspects of the implementations described above.
  • the processor 310 in the implementations of this technology may be an integrated circuit chip and has a signal processing capability. During implementation, the steps in the foregoing method may be implemented by using an integrated logic circuit of hardware in the processor 310 or an instruction in the form of software.
  • the processor 310 may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or another programmable logic device, a discrete gate or transistor logic device, and a discrete hardware component.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • the methods, steps, and logic block diagrams disclosed in the implementations of this technology may be implemented or performed.
  • the general-purpose processor 310 may be a microprocessor, or the processor 310 may be alternatively any conventional processor or the like.
  • the steps in the methods disclosed with reference to the implementations of this technology may be directly performed or completed by a decoding processor implemented as hardware or performed or completed by using a combination of hardware and software modules in a decoding processor.
  • the software module may be located at a random-access memory, a flash memory, a readonly memory, a programmable read-only memory or an electrically erasable programmable memory, a register, or another mature storage medium in this field.
  • the storage medium is located at a memory 320, and the processor 310 reads information in the memory 320 and completes the steps in the foregoing methods in combination with the hardware thereof.
  • the memory 320 in the implementations of this technology may be a volatile memory or a non-volatile memory, or may include both a volatile memory and a non-volatile memory.
  • the non-volatile memory may be a readonly memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM) or a flash memory.
  • the volatile memory may be a random-access memory (RAM) and is used as an external cache.
  • RAMs can be used, and are, for example, a static random-access memory (SRAM), a dynamic random-access memory (DRAM), a synchronous dynamic random-access memory (SDRAM), a double data rate synchronous dynamic random-access memory (DDR SDRAM), an enhanced synchronous dynamic random-access memory (ESDRAM), a synchronous link dynamic random-access memory (SLDRAM), and a direct Rambus randomaccess memory (DR RAM).
  • SRAM static random-access memory
  • DRAM dynamic random-access memory
  • SDRAM synchronous dynamic random-access memory
  • DDR SDRAM double data rate synchronous dynamic random-access memory
  • ESDRAM enhanced synchronous dynamic random-access memory
  • SLDRAM synchronous link dynamic random-access memory
  • DR RAM direct Rambus randomaccess memory
  • the memories in the systems and methods described herein are intended to include, but are not limited to, these memories and memories of any other suitable type.
  • the memory may be a non-transitory computer-readable storage medium that stores instructions capable of execution by a processor.
  • Fig. 4 is a flowchart of a method 400 in accordance with one or more implementations of the present disclosure.
  • the method 400 is for performing a DMSR transmission.
  • the method 400 can be implemented by a system (such as the wireless communications system 200).
  • the method 400 may also be implemented by the terminal device 203.
  • the method 400 includes, at block 401 , receiving, by a terminal device, configuration information of a demodulation reference signal (DMRS).
  • the configuration information indicates mapping relationships among multiple antenna ports and corresponding symbols for transmitting the DMRS.
  • the multiple antenna ports include more than 12 antenna ports.
  • the method 400 continues by determining, by the terminal device, a physical shared channel transmission based on the configuration information.
  • the physical shared channel transmission is a physical downlink shared channel (PDSCH) transmission.
  • the physical shared channel transmission is a physical uplink shared channel (PLISCH) transmission.
  • the method 400 continues by transmitting, by the terminal device, the DMRS based on the configuration information.
  • the multiple antenna ports include 24 antenna ports in a two-symbol configuration. In some embodiments, the multiple antenna ports include two sets of 12 antenna ports in a single-symbol configuration. In some embodiments, the multiple antenna ports include 16 antenna ports in a two-symbol configuration. In some embodiments, the multiple antenna ports include two sets of 8 antenna ports in a single-symbol configuration.
  • the mapping relationships are also among the multiple antenna ports and multiple resource elements in a frequency domain.
  • the mapping relationships can be indicative that a first set of ports of the multiple antenna ports are assigned to an odd-numbered resource element.
  • the mapping relationships can be indicative that a second set of ports of the multiple antenna ports are assigned to an even-numbered resource element.
  • a length-four orthogonal cover code is applied for a set of four ports of the multiple antenna ports that are mapped to a single resource element of the multiple resource elements.
  • a length-two OCC is applied for a set of two ports of the multiple antenna ports that are mapped to a single resource element of the multiple resource elements.
  • Fig. 5 is a flowchart of a method 500 in accordance with one or more implementations of the present disclosure.
  • the method 500 can be implemented by a system (such as the wireless communications system 200).
  • the method 500 may also be implemented by the network device 201 .
  • the method 500 includes, at block 501 , transmitting, by a base station, configuration information of a demodulation reference signal (DMRS).
  • DMRS demodulation reference signal
  • the configuration information indicates mapping relationships among multiple antenna ports and corresponding symbols for transmitting the DMRS.
  • the multiple antenna ports include more than 12 antenna ports.
  • the method 500 continues by causing, by the base station, the terminal device to transmit the DMRS based on the configuration information via a physical shared channel.
  • the multiple antenna ports include 24 antenna ports in a two-symbol configuration. In some embodiments, the multiple antenna ports include two sets of 12 antenna ports in a single-symbol configuration. In some embodiments, the multiple antenna ports include 16 antenna ports in a two-symbol configuration. In some embodiments, the multiple antenna ports include two sets of 8 antenna ports in a single-symbol configuration.
  • the mapping relationships are indicative that a first set of ports of the multiple antenna ports are assigned to an odd-numbered resource element. In some embodiments, the mapping relationships are indicative that a second set of ports of the multiple antenna ports are assigned to an even-numbered resource element. In some embodiments, for a set of four ports of the multiple antenna ports that are mapped to a single resource element of the multiple resource elements, a length-four orthogonal cover code (OCC) is applied. In some embodiments, for a set of two ports of the multiple antenna ports that are mapped to a single resource element of the multiple resource elements, a length-two OCC is applied.
  • OCC orthogonal cover code
  • Instructions for executing computer- or processorexecutable tasks can be stored in or on any suitable computer-readable medium, including hardware, firmware, ora combination of hardware and firmware. Instructions can be contained in any suitable memory device, including, for example, a flash drive and/or other suitable medium.
  • a and/or B may indicate the following three cases: A exists separately, both A and B exist, and B exists separately.

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Abstract

L'invention concerne des procédés et des systèmes de transmission de signal de référence de démodulation (DMRS). Dans certains modes de réalisation, le procédé comprend (1) la réception, par un dispositif terminal, d'informations de configuration d'un DMRS ; (2) la détermination, par le dispositif terminal, d'une transmission de canal partagé physique sur la base des informations de configuration ; et (3) la transmission, par le dispositif terminal, du DMRS sur la base des informations de configuration. Les informations de configuration indiquent des relations de mappage entre de multiples ports d'antenne et des symboles correspondants pour transmettre le DMRS, et les multiples ports d'antenne comprennent plus de 12 ports d'antenne.
PCT/IB2023/050117 2022-01-06 2023-01-06 Procédés et appareil de transmission de signal de référence de démodulation (dmrs) Ceased WO2023131908A1 (fr)

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