WO2023133790A1 - Procédés et appareil de signalisation pour indiquer des ports dmrs - Google Patents

Procédés et appareil de signalisation pour indiquer des ports dmrs Download PDF

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Publication number
WO2023133790A1
WO2023133790A1 PCT/CN2022/071940 CN2022071940W WO2023133790A1 WO 2023133790 A1 WO2023133790 A1 WO 2023133790A1 CN 2022071940 W CN2022071940 W CN 2022071940W WO 2023133790 A1 WO2023133790 A1 WO 2023133790A1
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WO
WIPO (PCT)
Prior art keywords
dmrs
signalling
ports
indicating
dmrs port
Prior art date
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PCT/CN2022/071940
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English (en)
Inventor
Yi Zhang
Wei Ling
Chenxi Zhu
Bingchao LIU
Lingling Xiao
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Lenovo (Beijing) Limited
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Priority to PCT/CN2022/071940 priority Critical patent/WO2023133790A1/fr
Publication of WO2023133790A1 publication Critical patent/WO2023133790A1/fr

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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
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • 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—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals

Definitions

  • the subject matter disclosed herein relates generally to wireless communication and more particularly relates to, but not limited to, methods and apparatus of signalling for indicating DMRS ports.
  • 5G Fifth Generation Partnership Project
  • 5G New Radio
  • NR New Radio
  • 5G Node B gNB
  • LTE Long Term Evolution
  • LTE-A LTE Advanced
  • E-UTRAN Node B eNB
  • Universal Mobile Telecommunications System UMTS
  • WiMAX WiMAX
  • Evolved UMTS Terrestrial Radio Access Network E-UTRAN
  • WLAN Wireless Local Area Networking
  • OFDM Orthogonal Frequency Division Multiplexing
  • SC-FDMA Single-Carrier Frequency-Division Multiple Access
  • DL Downlink
  • UL Uplink
  • a wireless mobile network may provide a seamless wireless communication service to a wireless communication terminal having mobility, i.e., user equipment (UE) .
  • the wireless mobile network may be formed of a plurality of base stations and a base station may perform wireless communication with the UEs.
  • the 5G New Radio is the latest in the series of 3GPP standards which supports very high data rate with lower latency compared to its predecessor LTE (4G) technology.
  • Two types of frequency range (FR) are defined in 3GPP. Frequency of sub-6 GHz range (from 450 to 6000 MHz) is called FR1 and millimeter wave range (from 24.25 GHz to 52.6 GHz) is called FR2.
  • FR1 Frequency of sub-6 GHz range (from 450 to 6000 MHz)
  • millimeter wave range from 24.25 GHz to 52.6 GHz
  • the 5G NR supports both FR1 and FR2 frequency bands.
  • a TRP is an apparatus to transmit and receive signals, and is controlled by a gNB through the backhaul between the gNB and the TRP.
  • a method including: receiving, by a receiver, a signalling for indicating DMRS ports that support a first DMRS port group with a first set of DMRS ports and a second DMRS port group with a second set of DMRS ports; and determining, by a processor, DMRS ports and DMRS resources associated with a DMRS transmission based on the signalling.
  • a method including: transmitting, by a transmitter, a signalling for indicating DMRS ports that support a first DMRS port group with a first set of DMRS ports and a second DMRS port group with a second set of DMRS ports; and determining, by a processor, DMRS ports and DMRS resources associated with a DMRS transmission based on the signalling.
  • an apparatus including: a receiver that receives a signalling for indicating DMRS ports that support a first DMRS port group with a first set of DMRS ports and a second DMRS port group with a second set of DMRS ports; and a processor that determines DMRS ports and DMRS resources associated with a DMRS transmission based on the signalling.
  • an apparatus including: a transmitter that transmits a signalling for indicating DMRS ports that support a first DMRS port group with a first set of DMRS ports and a second DMRS port group with a second set of DMRS ports; and processor that determines DMRS ports and DMRS resources associated with a DMRS transmission based on the signalling.
  • Figure 1 is a schematic diagram illustrating a wireless communication system in accordance with some implementations of the present disclosure
  • FIG. 2 is a schematic block diagram illustrating components of user equipment (UE) in accordance with some implementations of the present disclosure
  • FIG. 3 is a schematic block diagram illustrating components of network equipment (NE) in accordance with some implementations of the present disclosure
  • Figure 4 is a flow chart illustrating steps of receiving signalling for indicating DMRS ports by UE or gNB in accordance with some implementations of the present disclosure.
  • Figure 5 is a flow chart illustrating steps of transmitting signalling for indicating DMRS ports by UE or gNB in accordance with some implementations of the present disclosure.
  • embodiments may be embodied as a system, an apparatus, a method, or a program product. Accordingly, embodiments may take the form of an all-hardware embodiment, an all-software embodiment (including firmware, resident software, micro-code, etc. ) or an embodiment combining software and hardware aspects.
  • one or more embodiments may take the form of a program product embodied in one or more computer readable storage devices storing machine readable code, computer readable code, and/or program code, referred to hereafter as “code. ”
  • code computer readable code
  • the storage devices may be tangible, non-transitory, and/or non-transmission.
  • references throughout this specification to “one embodiment, ” “an embodiment, ” “an example, ” “some embodiments, ” “some examples, ” or similar language means that a particular feature, structure, or characteristic described is included in at least one embodiment or example.
  • instances of the phrases “in one embodiment, ” “in an example, ” “in some embodiments, ” and similar language throughout this specification may, but do not necessarily, all refer to the same embodiment (s) . It may or may not include all the embodiments disclosed.
  • Features, structures, elements, or characteristics described in connection with one or some embodiments are also applicable to other embodiments, unless expressly specified otherwise.
  • the terms “including, ” “comprising, ” “having, ” and variations thereof mean “including but not limited to, ” unless expressly specified otherwise.
  • first, ” “second, ” “third, ” and etc. are all used as nomenclature only for references to relevant devices, components, procedural steps, and etc. without implying any spatial or chronological orders, unless expressly specified otherwise.
  • a “first device” and a “second device” may refer to two separately formed devices, or two parts or components of the same device. In some cases, for example, a “first device” and a “second device” may be identical, and may be named arbitrarily.
  • a “first step” of a method or process may be carried or performed after, or simultaneously with, a “second step. ”
  • a and/or B may refer to any one of the following three combinations: existence of A only, existence of B only, and co-existence of both A and B.
  • the character “/” generally indicates an “or” relationship of the associated items. This, however, may also include an “and” relationship of the associated items.
  • A/B means “A or B, ” which may also include the co-existence of both A and B, unless the context indicates otherwise.
  • the code may also be stored in a storage device that can direct a computer, other programmable data processing apparatus, or other devices to function in a particular manner, such that the instructions stored in the storage device produce an article of manufacture including instructions which implement the function or act specified in the schematic flowchart diagrams and/or schematic block diagrams.
  • each block in the schematic flowchart diagrams and/or schematic block diagrams may represent a module, segment, or portion of code, which includes one or more executable instructions of the code for implementing the specified logical function (s) .
  • the flowchart diagrams need not necessarily be practiced in the sequence shown and are able to be practiced without one or more of the specific steps, or with other steps not shown.
  • Figure 1 is a schematic diagram illustrating a wireless communication system. It depicts an embodiment of a wireless communication system 100.
  • the wireless communication system 100 may include a user equipment (UE) 102 and a network equipment (NE) 104. Even though a specific number of UEs 102 and NEs 104 is depicted in Figure 1, one skilled in the art will recognize that any number of UEs 102 and NEs 104 may be included in the wireless communication system 100.
  • UE user equipment
  • NE network equipment
  • the UEs 102 may be referred to as remote devices, remote units, subscriber units, mobiles, mobile stations, users, terminals, mobile terminals, fixed terminals, subscriber stations, user terminals, apparatus, devices, user device, or by other terminology used in the art.
  • the UEs 102 may be autonomous sensor devices, alarm devices, actuator devices, remote control devices, or the like.
  • the UEs 102 may include computing devices, such as desktop computers, laptop computers, personal digital assistants (PDAs) , tablet computers, smart phones, smart televisions (e.g., televisions connected to the Internet) , set-top boxes, game consoles, security systems (including security cameras) , vehicle on-board computers, network devices (e.g., routers, switches, modems) , or the like.
  • the UEs 102 include wearable devices, such as smart watches, fitness bands, optical head-mounted displays, or the like. The UEs 102 may communicate directly with one or more of the NEs 104.
  • the NE 104 may also be referred to as a base station, an access point, an access terminal, a base, a Node-B, an eNB, a gNB, a Home Node-B, a relay node, an apparatus, a device, or by any other terminology used in the art.
  • a reference to a base station may refer to any one of the above referenced types of the network equipment 104, such as the eNB and the gNB.
  • the NEs 104 may be distributed over a geographic region.
  • the NE 104 is generally part of a radio access network that includes one or more controllers communicably coupled to one or more corresponding NEs 104.
  • the radio access network is generally communicably coupled to one or more core networks, which may be coupled to other networks, like the Internet and public switched telephone networks. These and other elements of radio access and core networks are not illustrated, but are well known generally by those having ordinary skill in the art.
  • the wireless communication system 100 is compliant with a 3GPP 5G new radio (NR) .
  • the wireless communication system 100 is compliant with a 3GPP protocol, where the NEs 104 transmit using an OFDM modulation scheme on the DL and the UEs 102 transmit on the uplink (UL) using a SC-FDMA scheme or an OFDM scheme.
  • the wireless communication system 100 may implement some other open or proprietary communication protocols, for example, WiMAX.
  • WiMAX open or proprietary communication protocols
  • the NE 104 may serve a number of UEs 102 within a serving area, for example, a cell (or a cell sector) or more cells via a wireless communication link.
  • the NE 104 transmits DL communication signals to serve the UEs 102 in the time, frequency, and/or spatial domain.
  • Communication links are provided between the NE 104 and the UEs 102a, 102b, 102c, and 102d, which may be NR UL or DL communication links, for example. Some UEs 102 may simultaneously communicate with different Radio Access Technologies (RATs) , such as NR and LTE. Direct or indirect communication link between two or more NEs 104 may be provided.
  • RATs Radio Access Technologies
  • the NE 104 may also include one or more transmit receive points (TRPs) 104a.
  • the network equipment may be a gNB 104 that controls a number of TRPs 104a.
  • the network equipment may be a TRP 104a that is controlled by a gNB.
  • Communication links are provided between the NEs 104, 104a and the UEs 102, 102a, respectively, which, for example, may be NR UL/DL communication links. Some UEs 102, 102a may simultaneously communicate with different Radio Access Technologies (RATs) , such as NR and LTE.
  • RATs Radio Access Technologies
  • the UE 102a may be able to communicate with two or more TRPs 104a that utilize a non-ideal or ideal backhaul, simultaneously.
  • a TRP may be a transmission point of a gNB. Multiple beams may be used by the UE and/or TRP (s) .
  • the two or more TRPs may be TRPs of different gNBs, or a same gNB. That is, different TRPs may have the same Cell-ID or different Cell-IDs.
  • TRP and “transmitting-receiving identity” may be used interchangeably throughout the disclosure.
  • FIG. 2 is a schematic block diagram illustrating components of user equipment (UE) according to one embodiment.
  • a UE 200 may include a processor 202, a memory 204, an input device 206, a display 208, and a transceiver 210.
  • the input device 206 and the display 208 are combined into a single device, such as a touchscreen.
  • the UE 200 may not include any input device 206 and/or display 208.
  • the UE 200 may include one or more processors 202 and may not include the input device 206 and/or the display 208.
  • the processor 202 may include any known controller capable of executing computer-readable instructions and/or capable of performing logical operations.
  • the processor 202 may be a microcontroller, a microprocessor, a central processing unit (CPU) , a graphics processing unit (GPU) , an auxiliary processing unit, a field programmable gate array (FPGA) , or similar programmable controller.
  • the processor 202 executes instructions stored in the memory 204 to perform the methods and routines described herein.
  • the processor 202 is communicatively coupled to the memory 204 and the transceiver 210.
  • the memory 204 in one embodiment, is a computer readable storage medium.
  • the memory 204 includes volatile computer storage media.
  • the memory 204 may include a RAM, including dynamic RAM (DRAM) , synchronous dynamic RAM (SDRAM) , and/or static RAM (SRAM) .
  • the memory 204 includes non-volatile computer storage media.
  • the memory 204 may include a hard disk drive, a flash memory, or any other suitable non-volatile computer storage device.
  • the memory 204 includes both volatile and non-volatile computer storage media.
  • the memory 204 stores data relating to trigger conditions for transmitting the measurement report to the network equipment.
  • the memory 204 also stores program code and related data.
  • the input device 206 may include any known computer input device including a touch panel, a button, a keyboard, a stylus, a microphone, or the like.
  • the input device 206 may be integrated with the display 208, for example, as a touchscreen or similar touch-sensitive display.
  • the display 208 may include any known electronically controllable display or display device.
  • the display 208 may be designed to output visual, audio, and/or haptic signals.
  • the transceiver 210 in one embodiment, is configured to communicate wirelessly with the network equipment.
  • the transceiver 210 comprises a transmitter 212 and a receiver 214.
  • the transmitter 212 is used to transmit UL communication signals to the network equipment and the receiver 214 is used to receive DL communication signals from the network equipment.
  • the transmitter 212 and the receiver 214 may be any suitable type of transmitters and receivers. Although only one transmitter 212 and one receiver 214 are illustrated, the transceiver 210 may have any suitable number of transmitters 212 and receivers 214.
  • the UE 200 includes a plurality of the transmitter 212 and the receiver 214 pairs for communicating on a plurality of wireless networks and/or radio frequency bands, with each of the transmitter 212 and the receiver 214 pairs configured to communicate on a different wireless network and/or radio frequency band.
  • FIG. 3 is a schematic block diagram illustrating components of network equipment (NE) 300 according to one embodiment.
  • the NE 300 may include a processor 302, a memory 304, an input device 306, a display 308, and a transceiver 310.
  • the processor 302, the memory 304, the input device 306, the display 308, and the transceiver 310 may be similar to the processor 202, the memory 204, the input device 206, the display 208, and the transceiver 210 of the UE 200, respectively.
  • the processor 302 controls the transceiver 310 to transmit DL signals or data to the UE 200.
  • the processor 302 may also control the transceiver 310 to receive UL signals or data from the UE 200.
  • the processor 302 may control the transceiver 310 to transmit DL signals containing various configuration data to the UE 200.
  • the transceiver 310 comprises a transmitter 312 and a receiver 314.
  • the transmitter 312 is used to transmit DL communication signals to the UE 200 and the receiver 314 is used to receive UL communication signals from the UE 200.
  • the transceiver 310 may communicate simultaneously with a plurality of UEs 200.
  • the transmitter 312 may transmit DL communication signals to the UE 200.
  • the receiver 314 may simultaneously receive UL communication signals from the UE 200.
  • the transmitter 312 and the receiver 314 may be any suitable type of transmitters and receivers. Although only one transmitter 312 and one receiver 314 are illustrated, the transceiver 310 may have any suitable number of transmitters 312 and receivers 314.
  • the NE 300 may serve multiple cells and/or cell sectors, where the transceiver 310 includes a transmitter 312 and a receiver 314 for each cell or cell sector.
  • DMRS downlink and uplink demodulation reference signal
  • dynamic signalling can be used to jointly indicate number of DMRS CDM group (s) without data, DMRS port (s) and number of front-load symbols.
  • the detailed information is shown as follows for downlink DMRS in TS 38.212. Similar description may be found for uplink DMRS in TS 38.212.
  • the antenna ports ⁇ p 0, ..., p ⁇ -1 ⁇ shall be determined according to the ordering of DMRS port (s) given by Tables 7.3.1.2.2-1/2/3/4 or Tables 7.3.1.2.2-1A/2A/3A/4A.
  • a UE When a UE receives an activation command that maps at least one codepoint of DCI field 'Transmission Configuration Indication' to two TCI states, the UE shall use Table 7.3.1.2.2-1A/2A/3A/4A; otherwise, it shall use Tables 7.3.1.2.2-1/2/3/4.
  • the UE can receive an entry with DMRS ports equals to 1000, 1002, 1003 when two TCI states are indicated in a codepoint of DCI field 'Transmission Configuration Indication' [and subject to UE capability] .
  • bitwidth of this field equals max ⁇ x A , x B ⁇ , where x A is the "Antenna ports” bitwidth derived according to dmrs-DownlinkForPDSCH-MappingTypeA and x B is the "Antenna ports” bitwidth derived according to dmrs-DownlinkForPDSCH-MappingTypeB.
  • zeros are padded in the MSB of this field, if the mapping type of the PDSCH corresponds to the smaller value of x A and x B .
  • DMRS ports 0-7 for type 1 DMRS and DMRS ports 0-11 for type 2 DMRS are indicated by the DCI signalling.
  • more than 8 DMRS ports for Type 1 DMRS or more than 12 DMRS ports for Type 2 DMRS will be introduced to support high dimension DMRS.
  • the maximum orthogonal DMRS port number may be 16 DMRS ports for Type 1 DMRS or 24 DMRS ports for Type 2 DMRS.
  • DMRS ports 0-3 for type1 DMRS and DMRS ports 0-5 for type 2 DMRS are indicated by the DCI signalling.
  • more than 4 DMRS ports for Type 1 DMRS or more than 6 DMRS ports for Type 2 DMRS will be introduced to support high dimension DMRS.
  • the maximum orthogonal DMRS port number may be 8 DMRS ports for Type 1 DMRS or 12 DMRS ports for Type 2 DMRS.
  • the scrambling ID for sequence initialization can be dynamically indicated for CP-OFDM waveform.
  • the detailed information is described in DCI format 0-1 or 1-1 in TS 38.212 as follows.
  • the DCI signalling may indicate used DMRS port (s) , number of DMRS CDM group (s) without data and number of front-load symbols.
  • used DMRS port (s) the related discussion is restricted to a maximum of 8 and 12 ports for type1 and type 2 DMRS, respectively.
  • more DMRS ports may be introduced to support high dimension MU-MIMO for more multiplexed UEs, where the maximum orthogonal DMRS port number may be 24.
  • the new or updated DCI signalling is proposed for enhanced port indication, parameters determination for resource mapping, rate matching for data and interference cancelling in the case of large number of DMRS ports, e.g. 24.
  • DMRS indication schemes to support large number of DMRS ports, e.g. maximum 24 DMRS ports.
  • the function may be carried by DCI signalling including actually used DMRS ports, DMRS CDM group number, front-load symbol number and additional information for multiplexed DMRS ports.
  • legacy signalling framework including existing DCI signalling for antenna port indication as much as possible and only introduce a small number of bits to realize the function.
  • DMRS sequence, OCC sequence, RE groups in a PRB of one CDM group and OFDM symbol groups can be used for corresponding DMRS port groups. Based on these specific resource mapping schemes, enhanced schemes on signalling indication for DMRS ports are proposed.
  • joint or separate indicating schemes may be used in general.
  • port index from 0 to 15 for type 1 DMRS or from 0 to 23 for type 2 DMRS are indicated for joint indicating scheme but only port index from 0 to 7 for type 1 DMRS or from 0 to 11 for type 2 DMRS in one DMRS port group are indicated for separate indicating scheme.
  • port index from 0 to 7 for type 1 DMRS or from 0 to 11 for type 2 DMRS are indicated for joint indicating scheme but only port index from 0 to 3 for type 1 DMRS or from 0 to 5 for type 2 DMRS in one DMRS port group are indicated for separate indicating scheme.
  • DMRS enhancement for SU-MIMO although DMRS is increased to support high dimension MU-MIMO including multiple TRP scenario.
  • DMRS for one UE is transmitted on one DMRS resource or associated resources on two DMRS resources.
  • associated resources on two DMRS resources they share the same legacy DM-RS port indication signalling to indicate the DM-RS port in the corresponding DM-RS port group.
  • separate indicating scheme may be used to simplify signalling design.
  • one additional bit is introduced to indicate DMRS port group.
  • Table 1 legacy DCI bits for DMRS port indication are used to indicate DMRS port (s) in one DMRS port group.
  • DMRS port group 1 is indicated and DMRS port indicated by legacy DCI bits is port 1
  • maxLength 2
  • DMRS port group 1 is indicated and DMRS port indicated by legacy DCI bits is port 1
  • the resulting DMRS port is port 5 (i.e., 1+4) for type 1 DMRS, or port 7 (i.e., 1+6) for type 2 DMRS.
  • Table 1 One DCI bit for DMRS port group indication
  • the total number of DMRS port group, or the number of DMRS port groups without data may also be indicated, where the other DMRS port group may be used for other UEs on account of MU-MIMO transmission or the power of other DMRS port group being borrowed for power boosting to improve channel estimation performance.
  • UE may know whether DMRS ports from other DMRS port group exist.
  • Table 2 with two bits indication, where the number of DMRS port groups without data or the number of total DMRS power groups is indicated together with DMRS port group index.
  • the two bits may have values of “00” , “01” , “10” , and “11” , representing a first state, a second state, a third state, and a fourth state, respectively.
  • the state for ‘11’ i.e., the fourth state, may be reserved.
  • the interference can be mitigated to some extent by MMSE-IRC receiver if DMRS sequence is known for other co-scheduled DMRS ports.
  • length 2 OCC sequence or length 4 OCC sequence may be determined based on DMRS group number, where length 2 OCC sequence corresponds to 1 DMRS port group and length 4 OCC sequence corresponds to 2 DMRS port groups.
  • the indication of the number of DMRS port groups without data or the number of total DMRS power groups is equivalent or substituted to indicate OCC sequence length, i.e. length 2 or length 4 OCC sequence.
  • total 2 DMRS port groups can be dynamically indicated and resources for the other DMRS port group is not used for data transmission.
  • total 2 DMRS port groups e.g., value ‘01’ or ‘10’ in Table 2 , it means that the resources for two DMRS port group are not used for data transmission, or the number of DMRS port groups without data is two.
  • the indication of the number of DMRS port groups without data or the number of total DMRS power groups is equivalent or substituted to indicate whether power boosting is used for a RE group in a CDM group.
  • Power boosting is used for a RE group in a CDM group where the signalling for indicating DMRS ports indicates that the number of DMRS port groups without data is two; and power boosting is not used for a RE group in a CDM group where the signalling for indicating DMRS ports indicates that the number of DMRS port groups without data is one.
  • additional OFDM symbol group exists only when there are two DMRS port groups. If there is only one DMRS port group, OFDM symbols from the second DMRS port group can be used for data transmission. If there are two DMRS port groups, REs in OFDM symbols from additional OFDM symbol group need being made rate matching for data transmission. It may improve transmission efficiency on account of more REs for data transmission relative to always rate matching for REs in OFDM symbols from additional OFDM symbol group.
  • the indication of the number of DMRS port groups without data or the number of total DMRS power groups is equivalent or substituted to indicate whether REs from an additional OFDM symbol group is allowed to be used for PDSCH transmission corresponding to the total DMRS port group number.
  • Table 2 Two DCI bits for DMRS port group indication
  • Table 3 The ratio of PDSCH EPRE to DMRS EPRE on account of DMRS port group number
  • implicit scheme may be used to indicate used DMRS port group.
  • the legacy dynamic signalling for sequence initiation may be implicitly used for indicating DMRS port group index.
  • one initialization value for the DMRS sequence is implicitly associated with one DMRS port group.
  • the interference is mitigated between DMRS ports from different DMRS port groups since different beamforming may be used for the transmission of DMRS with different sequences, which can be associated with different TRPs.
  • additional signalling i.e., the proposed one or two DCI bits
  • additional association i.e., the proposed implicit scheme without additional bit
  • it may be DMRS-Downlink_LargeAP-r18 and DMRS_Uplink_LargeAP-r18 in DMRS-DownlinkConfig or DMRS-UplinkConfig, respectively.
  • Table 4 shows an example of the related RRC signalling for DMRS-Downlink_LargeAP-r18.
  • Table 4 RRC signalling in DMRS-DownlinkConfig to enable enhanced indication scheme for high dimension DMRS
  • the proposed signalling for indicating DMRS ports may be applicable for both downlink DMRS and uplink DMRS.
  • Figure 4 is a flow chart illustrating steps of receiving signalling for indicating DMRS ports by UE 200 or gNB 300 in accordance with some implementations of the present disclosure.
  • the receiver 214 or 314 receives a signalling for indicating DMRS ports that support a first DMRS port group with a first set of DMRS ports and a second DMRS port group with a second set of DMRS ports.
  • the processor 202 or 302 determines DMRS ports and DMRS resources associated with a DMRS transmission based on the signalling.
  • Figure 5 is a flow chart illustrating steps of transmitting signalling for indicating DMRS ports by UE 200 or gNB 300 in accordance with some implementations of the present disclosure.
  • the transmitter 212 or 312 transmits a signalling for indicating DMRS ports that support a first DMRS port group with a first set of DMRS ports and a second DMRS port group with a second set of DMRS ports.
  • the processor 202 or 302 determines DMRS ports and DMRS resources associated with a DMRS transmission based on the signalling.
  • some items as examples of the disclosure concerning a method of reception of signalling for indicating DMRS ports by UE or gNB may be summarized as follows:
  • a method comprising:
  • a receiver receiving, by a receiver, a signalling for indicating DMRS ports that support a first DMRS port group with a first set of DMRS ports and a second DMRS port group with a second set of DMRS ports;
  • DMRS port group 0 indicates that the DMRS ports associated with the DMRS transmission are the first set of DMRS ports indicated by legacy DCI bits; and DMRS port group 1 indicates that the DMRS ports associated with the DMRS transmission are the second set of DMRS ports indicated by legacy DCI bits with an offset value.
  • a second state indicating that DMRS port group 0 is associated with the DMRS transmission and the number of DMRS port groups without data is two;
  • a third state indicating that DMRS port group 1 is associated with the DMRS transmission and the number of DMRS port groups without data is two;
  • a fourth state indicating “reserved” or that DMRS port group 1 is associated with the DMRS transmission and the number of DMRS port groups without data is one, or that both DMRS port group 0 and DMRS port group 1 are associated with the DMRS transmission and the number of DMRS port groups without data is two.
  • the signalling for indicating DMRS ports comprises an indication of a length of OCC sequence, with length 2 OCC sequence indicating that the number of DMRS port groups without data is one, and length 4 OCC sequence indicating that the number of DMRS port groups without data is two.
  • DMRS power is boosted with 1.76 dB for even PRB, and 4.77 dB for odd PRB, for type 1 DMRS; or is boosted with 3 dB for type 2 DMRS.
  • the signalling for indicating DMRS ports comprises an indication of whether REs from an additional OFDM symbol group is allowed to be used for PDSCH transmission corresponding to the total DMRS port group number.
  • the signalling for indicating DMRS ports comprise reuse of legacy dynamic signalling for sequence initiation for indicating DMRS port group index based on an implicit association between DMRS initial sequence and DMRS port group.
  • a method comprising:
  • a transmitter transmitting, by a transmitter, a signalling for indicating DMRS ports that support a first DMRS port group with a first set of DMRS ports and a second DMRS port group with a second set of DMRS ports;
  • DMRS port group 0 indicates that the DMRS ports associated with the DMRS transmission are the first set of DMRS ports indicated by legacy DCI bits; and DMRS port group 1 indicates that the DMRS ports associated with the DMRS transmission are the second set of DMRS ports indicated by legacy DCI bits with an offset value.
  • a second state indicating that DMRS port group 0 is associated with the DMRS transmission and the number of DMRS port groups without data is two;
  • a third state indicating that DMRS port group 1 is associated with the DMRS transmission and the number of DMRS port groups without data is two;
  • a fourth state indicating “reserved” or that DMRS port group 1 is associated with the DMRS transmission and the number of DMRS port groups without data is one, or that both DMRS port group 0 and DMRS port group 1 are associated with the DMRS transmission and the number of DMRS port groups without data is two.
  • the signalling for indicating DMRS ports comprises an indication of a length of OCC sequence, with length 2 OCC sequence indicating that the number of DMRS port groups without data is one, and length 4 OCC sequence indicating that the number of DMRS port groups without data is two.
  • An apparatus comprising:
  • a receiver that receives a signalling for indicating DMRS ports that support a first DMRS port group with a first set of DMRS ports and a second DMRS port group with a second set of DMRS ports;
  • a processor that determines DMRS ports and DMRS resources associated with a DMRS transmission based on the signalling.
  • DMRS port group 0 indicates that the DMRS ports associated with the DMRS transmission are the first set of DMRS ports indicated by legacy DCI bits; and DMRS port group 1 indicates that the DMRS ports associated with the DMRS transmission are the second set of DMRS ports indicated by legacy DCI bits with an offset value.
  • a second state indicating that DMRS port group 0 is associated with the DMRS transmission and the number of DMRS port groups without data is two;
  • a third state indicating that DMRS port group 1 is associated with the DMRS transmission and the number of DMRS port groups without data is two;
  • a fourth state indicating “reserved” or that DMRS port group 1 is associated with the DMRS transmission and the number of DMRS port groups without data is one, or that both DMRS port group 0 and DMRS port group 1 are associated with the DMRS transmission and the number of DMRS port groups without data is two.
  • the signalling for indicating DMRS ports comprises an indication of a length of OCC sequence, with length 2 OCC sequence indicating that the number of DMRS port groups without data is one, and length 4 OCC sequence indicating that the number of DMRS port groups without data is two.
  • DMRS power is boosted with 1.76 dB for even PRB, and 4.77 dB for odd PRB, for type 1 DMRS; or is boosted with 3 dB for type 2 DMRS.
  • the signalling for indicating DMRS ports comprises an indication of whether REs from an additional OFDM symbol group is allowed to be used for PDSCH transmission corresponding to the total DMRS port group number.
  • the signalling for indicating DMRS ports comprise reuse of legacy dynamic signalling for sequence initiation for indicating DMRS port group index based on an implicit association between DMRS initial sequence and DMRS port group.
  • An apparatus comprising:
  • a transmitter that transmits a signalling for indicating DMRS ports that support a first DMRS port group with a first set of DMRS ports and a second DMRS port group with a second set of DMRS ports;
  • processor that determines DMRS ports and DMRS resources associated with a DMRS transmission based on the signalling.
  • DMRS port group 0 indicates that the DMRS ports associated with the DMRS transmission are the first set of DMRS ports indicated by legacy DCI bits; and DMRS port group 1 indicates that the DMRS ports associated with the DMRS transmission are the second set of DMRS ports indicated by legacy DCI bits with an offset value.
  • a second state indicating that DMRS port group 0 is associated with the DMRS transmission and the number of DMRS port groups without data is two;
  • a third state indicating that DMRS port group 1 is associated with the DMRS transmission and the number of DMRS port groups without data is two;
  • a fourth state indicating “reserved” or that DMRS port group 1 is associated with the DMRS transmission and the number of DMRS port groups without data is one, or that both DMRS port group 0 and DMRS port group 1 are associated with the DMRS transmission and the number of DMRS port groups without data is two.
  • the signalling for indicating DMRS ports comprises an indication of a length of OCC sequence, with length 2 OCC sequence indicating that the number of DMRS port groups without data is one, and length 4 OCC sequence indicating that the number of DMRS port groups without data is two.
  • the apparatus of item 43, wherein the signalling for indicating DMRS ports comprises an indication of number of RE groups in a PRB pair per CDM group.
  • DMRS power is boosted with 1.76 dB for even PRB, and 4.77 dB for odd PRB, for type 1 DMRS; or is boosted with 3 dB for type 2 DMRS.
  • the apparatus of item 43 or 47, wherein the signalling for indicating DMRS ports comprises an indication of whether REs from an additional OFDM symbol group is allowed to be used for PDSCH transmission corresponding to the total DMRS port group number.
  • the signalling for indicating DMRS ports comprise reuse of legacy dynamic signalling for sequence initiation for indicating DMRS port group index based on an implicit association between DMRS initial sequence and DMRS port group.

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

Abstract

Sont divulgués des procédés et un appareil de signalisation pour indiquer des ports DMRS. L'appareil comprend : un récepteur qui reçoit une signalisation pour indiquer des ports DMRS qui prennent en charge un premier groupe de ports DMRS ayant un premier ensemble de ports DMRS et un second groupe de ports DMRS ayant un second ensemble de ports DMRS ; et un processeur qui détermine des ports DMRS et des ressources DMRS associés à une transmission DMRS sur la base de la signalisation.
PCT/CN2022/071940 2022-01-14 2022-01-14 Procédés et appareil de signalisation pour indiquer des ports dmrs WO2023133790A1 (fr)

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