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WO2025145643A1 - Procédés et appareils de transmission avec réseaux d'antennes extrêmement grands - Google Patents

Procédés et appareils de transmission avec réseaux d'antennes extrêmement grands Download PDF

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Publication number
WO2025145643A1
WO2025145643A1 PCT/CN2024/115911 CN2024115911W WO2025145643A1 WO 2025145643 A1 WO2025145643 A1 WO 2025145643A1 CN 2024115911 W CN2024115911 W CN 2024115911W WO 2025145643 A1 WO2025145643 A1 WO 2025145643A1
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WIPO (PCT)
Prior art keywords
subarray
tci
tci state
antenna array
group
Prior art date
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PCT/CN2024/115911
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English (en)
Inventor
Chenxi Zhu
Bingchao LIU
Yi Zhang
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Lenovo Beijing Ltd
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Lenovo Beijing Ltd
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Priority to PCT/CN2024/115911 priority Critical patent/WO2025145643A1/fr
Publication of WO2025145643A1 publication Critical patent/WO2025145643A1/fr
Pending legal-status Critical Current
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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
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • 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
    • H04B7/0691—Hybrid systems, i.e. switching and simultaneous transmission using subgroups of transmit antennas

Definitions

  • the present disclosure relates to wireless communications, and more specifically to methods and apparatuses for transmission with extremely large antenna arrays (ELAA) .
  • ELAA extremely large antenna arrays
  • a wireless communications system may include one or multiple network communication devices, such as base stations (BSs) , which may support wireless communications for one or multiple user communication devices, which may be otherwise known as user equipment (UE) , or other suitable terminology.
  • the wireless communications system may support wireless communications with one or multiple user communication devices by utilizing resources of the wireless communication system (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers, or the like) .
  • the wireless communications system may support wireless communications across various radio access technologies including third generation (3G) radio access technology, fourth generation (4G) radio access technology, fifth generation (5G) radio access technology, among other suitable radio access technologies beyond 5G (e.g., sixth generation (6G) ) .
  • 3G third generation
  • 4G fourth generation
  • 5G fifth generation
  • 6G sixth generation
  • the phrase “based on” shall not be construed as a reference to a closed set of conditions.
  • an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure.
  • the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on. "
  • a "set" may include one or more elements.
  • the BS may include: at least one memory; and at least one processor coupled with the at least one memory and configured to cause the BS to: partition an antenna array into N subarrays, wherein N ⁇ 1, and each subarray of the antenna array includes a number of adjacent antennas and is associated with a respective beamforming vector; and transmit N r data layers from the antenna array, wherein N r ⁇ 1, and each subarray of the antenna array is used to transmit a single data layer of the N r data layers.
  • the at least one processor is further configured to cause the BS to divide the N subarrays into N r subarray groups, and each subarray group of the N r subarray groups is used to transmit a respective data layer of the N r data layers.
  • N r is 1, and a single data layer is transmitted from the N subarrays using the respective beamforming vectors associated with the N subarrays.
  • each subarray group of the N r subarray groups consists of at least K subarray (s) , and is used to transmit the respective data layer of the N r data layers using the respective beamforming vectors associated with the at least K subarray (s) in the subarray group, and
  • the at least K subarray (s) of the subarray group are adjacent subarrays.
  • the at least K subarray (s) of the subarray group are interleaved subarrays.
  • the at least one processor is further configured to cause the BS to transmit downlink control information (DCI) scheduling transmission of the N r data layers, the DCI indicates N r transmission configuration indication (TCI) state groups, and each TCI state group of the N r TCI state groups is associated with a respective data layer of the N r data layers.
  • DCI downlink control information
  • TCI transmission configuration indication
  • each TCI state group of the N r TCI state groups includes one or more TCI states, and each TCI state of the one or more TCI states is associated with a respective subarray used to transmit the respective data layer associated with the TCI state group.
  • the one or more TCI states included in each TCI state group of the N r TCI state groups are transmitted in the DCI.
  • each TCI state group of the N r TCI state groups is associated with a group index, and the group index associated with each TCI state group of the N r TCI state groups is transmitted in the DCI.
  • the at least one processor is further configured to cause the BS to transmit a radio resource control (RRC) or medium access control (MAC) control element (CE) configuration message including the one or more TCI states included in each TCI state group of the N r TCI state groups.
  • RRC radio resource control
  • MAC medium access control
  • CE control element
  • the respective beamforming vector associated with each subarray of the N subarrays is a discrete-time Fourier transform (DFT) beamforming vector for steering a beam associated with the subarray towards a receiver of a UE.
  • DFT discrete-time Fourier transform
  • the at least one processor is configured to cause the BS to apply a hybrid beamforming precoder to the antenna array for transmission of the N r data layers, and the hybrid beamforming precoder includes an analogue beamforming part and a digital precoder.
  • the analogue beamforming part is applied to each subarray of the N subarrays to apply the respective beamforming vector to the subarray.
  • the digital precoder determines a data layer of the N r data layers to be transmitted from the subarray.
  • Some implementations of the methods and apparatuses described herein may include a UE for wireless communication.
  • the UE may include: at least one memory; and at least one processor coupled with the at least one memory and configured to cause the UE to: receive DCI scheduling transmission of N r data layers from an antenna array of a BS, wherein N r ⁇ 1, the antenna array includes N subarrays, N ⁇ 1, and each subarray of the antenna array includes a number of adjacent antennas and is associated with a respective TCI state; and receive the N r data layers with N TCI states associated with the N subarrays, wherein the N TCI states are indicated by the DCI.
  • the N TCI states are divided into N r TCI state groups, each TCI state group of the N r TCI state groups is associated with a respective data layer of the N r data layers, and each TCI state of the N TCI states is included in a single TCI state group of the N r TCI state groups.
  • each TCI state group of the N r TCI state groups includes one or more TCI states, and the one or more TCI states included in each TCI state group of the N r TCI state groups are included in the DCI.
  • each TCI state group of the N r TCI state groups is associated with a group index, and the group index associated with each TCI state group of the N r TCI state groups is included in the DCI.
  • each TCI state group of the N r TCI state groups includes one or more TCI states
  • the at least one processor is further configured to cause the UE to receive an RRC or MAC CE configuration message including the one or more TCI states included in each TCI state group of the N r TCI state groups.
  • the processor may include: at least one controller coupled with at least one memory and configured to cause the processor to: partition an antenna array into N subarrays, wherein N ⁇ 1, and each subarray of the antenna array includes a number of adjacent antennas and is associated with a respective beamforming vector; and transmit N r data layers from the antenna array, wherein N r ⁇ 1, and each subarray of the antenna array is used to transmit a single data layer of the N r data layers.
  • Some implementations of the methods and apparatuses described herein may include a method performed by a BS.
  • the method may include: partitioning an antenna array into N subarrays, wherein N ⁇ 1, and each subarray of the antenna array includes a number of adjacent antennas and is associated with a respective beamforming vector; and transmitting N r data layers from the antenna array, wherein N ⁇ 1, and each subarray of the antenna array is used to transmit a single data layer of the N r data layers.
  • the processor may include: at least one controller coupled with at least one memory and configured to cause the processor to: receive DCI scheduling transmission of N r data layers from an antenna array of a BS, wherein N r ⁇ 1, the antenna array includes N subarrays, N ⁇ 1, and each subarray of the antenna array includes a number of adjacent antennas and is associated with a respective TCI state; and receive the N r data layers with N TCI states associated with the N subarrays, wherein the N TCI states are indicated by the DCI.
  • Some implementations of the methods and apparatuses described herein may include a method performed by a UE.
  • the method may include: receiving DCI scheduling transmission of N r data layers from an antenna array of a BS, wherein N r ⁇ 1, the antenna array includes N subarrays, N ⁇ 1, and each subarray of the antenna array includes a number of adjacent antennas and is associated with a respective TCI state; and receiving the N r data layers with N TCI states associated with the N subarrays, wherein the N TCI states are indicated by the DCI.
  • Figure 2 illustrates a flowchart of an exemplary method performed by a BS in accordance with aspects of the present disclosure.
  • Figure 3 illustrates an example of transmission with an antenna array partitioned into subarrays with aspects of the present disclosure.
  • Figure 4 illustrates an example of transmission of multiple data layers with an antenna array partitioned into subarrays in accordance with aspects of the present disclosure.
  • Figure 5 illustrates another example of transmission of multiple data layers with an antenna array partitioned into subarrays in accordance with aspects of the present disclosure.
  • Figure 6 illustrates a flowchart of an exemplary method performed by a UE in accordance with aspects of the present disclosure.
  • Figure 7 illustrates an example of a BS in accordance with aspects of the present disclosure.
  • Figure 8 illustrates an example of a processor in accordance with aspects of the present disclosure.
  • Figure 9 illustrates an example of a UE in accordance with aspects of the present disclosure.
  • FIG. 1 illustrates an example of a wireless communications system 100 in accordance with aspects of the present disclosure.
  • the wireless communications system 100 may include one or more network equipments (NEs) (e.g., BSs) 102, one or more UEs 104, and a core network (CN) 106.
  • the wireless communications system 100 may support various radio access technologies.
  • the wireless communications system 100 may be a 4G network, such as an LTE network or an LTE-Advanced (LTE-A) network.
  • LTE-A LTE-Advanced
  • the wireless communications system 100 may be an NR network, such as a 5G network, a 5G-Advanced (5G-A) network, or a 5G ultrawideband (5G-UWB) network.
  • 5G-A 5G-Advanced
  • 5G-UWB 5G ultrawideband
  • the wireless communications system 100 may be a combination of a 4G network and a 5G network, or other suitable radio access technology including Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20.
  • IEEE Institute of Electrical and Electronics Engineers
  • Wi-Fi Wi-Fi
  • WiMAX IEEE 802.16
  • IEEE 802.20 The wireless communications system 100 may support radio access technologies beyond 5G, for example, 6G. Additionally, the wireless communications system 100 may support technologies, such as time division multiple access (TDMA) , frequency division multiple access (FDMA) , or code division multiple access (CDMA) , etc.
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • CDMA code division multiple access
  • the one or more NEs 102 may be dispersed throughout a geographic region to form the wireless communications system 100.
  • One or more of the NEs 102 described herein may be or include or may be referred to as a network node, a base station, a network element, a network function, a network entity, a radio access network (RAN) , a NodeB, an eNodeB (eNB) , a next-generation NodeB (gNB) , or other suitable terminology.
  • An NE 102 and a UE 104 may communicate via a communication link, which may be a wireless or wired connection.
  • an NE 102 and a UE 104 may perform wireless communication (e.g., receive signaling, transmit signaling) over a Uu interface.
  • An NE 102 may provide a geographic coverage area for which the NE 102 may support services for one or more UEs 104 within the geographic coverage area.
  • an NE 102 and a UE 104 may support wireless communication of signals related to services (e.g., voice, video, packet data, messaging, broadcast, etc. ) according to one or multiple radio access technologies.
  • an NE 102 may be moveable, for example, a satellite associated with a non-terrestrial network (NTN) .
  • NTN non-terrestrial network
  • different geographic coverage areas associated with the same or different radio access technologies may overlap, but the different geographic coverage areas may be associated with different NEs 102.
  • the one or more UEs 104 may be dispersed throughout a geographic region of the wireless communications system 100.
  • a UE 104 may include or may be referred to as a remote unit, a mobile device, a wireless device, a remote device, a subscriber device, a transmitter device, a receiver device, or some other suitable terminology.
  • the UE 104 may be referred to as a unit, a station, a terminal, or a client, among other examples.
  • the UE 104 may be referred to as an Internet-of-Things (IoT) device, an Internet-of-Everything (IoE) device, or machine-type communication (MTC) device, among other examples.
  • IoT Internet-of-Things
  • IoE Internet-of-Everything
  • MTC machine-type communication
  • a UE 104 may be able to support wireless communication directly with other UEs 104 over a communication link.
  • a UE 104 may support wireless communication directly with another UE 104 over a device-to-device (D2D) communication link.
  • D2D device-to-device
  • the communication link may be referred to as a sidelink.
  • a UE 104 may support wireless communication directly with another UE 104 over a PC5 interface.
  • An NE 102 may support communications with the CN 106, or with another NE 102, or both.
  • an NE 102 may interface with other NE 102 or the CN 106 through one or more backhaul links (e.g., S1, N2, N2, or network interface) .
  • the NEs 102 may communicate with each other directly.
  • the NEs 102 may communicate with each other indirectly (e.g., via the CN 106) .
  • one or more NEs 102 may include subcomponents, such as an access network entity, which may be an example of an access node controller (ANC) .
  • An ANC may communicate with the one or more UEs 104 through one or more other access network transmission entities, which may be referred to as radio heads, smart radio heads, or transmission-reception points (TRPs) .
  • TRPs transmission-reception points
  • the CN 106 may support user authentication, access authorization, tracking, connectivity, and other access, routing, or mobility functions.
  • the CN 106 may be an evolved packet core (EPC) , or a 5G core (5GC) , which may include a control plane entity that manages access and mobility (e.g., a mobility management entity (MME) , an access and mobility management function (AMF) ) and a user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW) , a Packet Data Network (PDN) gateway (P-GW) , or a user plane function (UPF) ) .
  • EPC evolved packet core
  • 5GC 5G core
  • MME mobility management entity
  • AMF access and mobility management function
  • S-GW serving gateway
  • PDN gateway Packet Data Network gateway
  • UPF user plane function
  • control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management (e.g., data bearers, signal bearers, etc. ) for the one or more UEs 104 served by the one or more NEs 102 associated with the CN 106.
  • NAS non-access stratum
  • the CN 106 may communicate with a packet data network over one or more backhaul links (e.g., via an S1, N2, N2, or another network interface) .
  • the packet data network may include an application server.
  • one or more UEs 104 may communicate with the application server.
  • a UE 104 may establish a session (e.g., a protocol data unit (PDU) session, or the like) with the CN 106 via an NE 102.
  • the CN 106 may route traffic (e.g., control information, data, and the like) between the UE 104 and the application server using the established session (e.g., the established PDU session) .
  • the PDU session may be an example of a logical connection between the UE 104 and the CN 106 (e.g., one or more network functions of the CN 106) .
  • the NEs 102 and the UEs 104 may support various frame structures (e.g., multiple frame structures) .
  • the NEs 102 and the UEs 104 may support various frame structures based on one or more numerologies.
  • One or more numerologies may be supported in the wireless communications system 100, and a numerology may include a subcarrier spacing and a cyclic prefix.
  • a first subcarrier spacing e.g., 15 kHz
  • a normal cyclic prefix e.g. 15 kHz
  • the first numerology associated with the first subcarrier spacing (e.g., 15 kHz) may utilize one slot per subframe.
  • a time interval of a resource may be organized according to frames (also referred to as radio frames) .
  • Each frame may have a duration, for example, a 10 millisecond (ms) duration.
  • each frame may include multiple subframes.
  • each frame may include 10 subframes, and each subframe may have a duration, for example, a 1 ms duration.
  • each frame may have the same duration.
  • each subframe of a frame may have the same duration.
  • a time interval of a resource may be organized according to slots.
  • a subframe may include a number (e.g., quantity) of slots.
  • the number of slots in each subframe may also depend on the one or more numerologies supported in the wireless communications system 100.
  • Each slot may include a number (e.g., quantity) of symbols (e.g., orthogonal frequency division multiplexing (OFDM) symbols) .
  • the number (e.g., quantity) of slots for a subframe may depend on a numerology.
  • a slot For a normal cyclic prefix, a slot may include 14 symbols.
  • a slot For an extended cyclic prefix (e.g., applicable for 60 kHz subcarrier spacing) , a slot may include 12 symbols.
  • an electromagnetic (EM) spectrum may be split, based on frequency or wavelength, into various classes, frequency bands, frequency channels, etc.
  • the wireless communications system 100 may support one or multiple operating frequency bands, such as frequency range designations FR1 (410 MHz –7.125 GHz) , FR2 (24.25 GHz –52.6 GHz) , FR3 (7.125 GHz –24.25 GHz) , FR4 (52.6 GHz –114.25 GHz) , FR4a or FR4-1 (52.6 GHz –71 GHz) , and FR5 (114.25 GHz –300 GHz) .
  • FR1 410 MHz –7.125 GHz
  • FR2 24.25 GHz –52.6 GHz
  • FR3 7.125 GHz –24.25 GHz
  • FR4 (52.6 GHz –114.25 GHz)
  • FR4a or FR4-1 52.6 GHz –71 GHz
  • FR5 114.25 GHz
  • the NEs 102 and the UEs 104 may perform wireless communications over one or more of the operating frequency bands.
  • FR1 may be used by the NEs 102 and the UEs 104, among other equipment or devices for cellular communications traffic (e.g., control information, data) .
  • FR2 may be used by the NEs 102 and the UEs 104, among other equipment or devices for short-range, high data rate capabilities.
  • FR1 may be associated with one or multiple numerologies (e.g., at least three numerologies) .
  • FR2 may be associated with one or multiple numerologies (e.g., at least 2 numerologies) .
  • XL-MIMO extremely large-scale MIMO
  • mmWave millimeter-wave
  • THz terahertz
  • high-frequency communications may provide largely available bandwidth.
  • the very small size of high-frequency antennas favorably enables the deployment of XL-MIMO with an extremely large number of antenna elements. Therefore, high-frequency XL-MIMO may be a key enabling technology for 6G communications.
  • the EM field begins to exhibit some near field properties.
  • the Rayleigh distance (e.g., denoted as L R ) , which defines the boundary between the near field and the far field, is calculated as follows:
  • D is the largest dimension of the antenna array
  • ⁇ is the wavelength
  • the Rayleigh distance may increase, which means that the near field region increases, and thus more UEs are included in the near field region.
  • the typical antenna element in an extremely large antenna array may still be an electric dipole antenna (unidirectional or cross polarized) .
  • the electric field from an oscillating electric dipole is as follows:
  • ⁇ is perpendicular to the direction vector
  • ⁇ is the outgoing spherical wave with speed c.
  • the electric field of the near field EM wave radiated from an antenna array is the summation of the electric field radiated from all the antennas in the antenna array. Accordingly, a near field signal received from the antenna array can be calculated as a sum of the signals from all the antennas in the antenna array.
  • the EM wave radiated from an antenna array can be treated as a planar wave (or a combination of planar waves) .
  • the design of massive MIMO in 5G NR is based on the planar wave assumption.
  • the beamforming vector driving a subset or all of the antenna elements in the antenna array is a DFT vector steering towards the direction of the outgoing or incoming wave.
  • the EM wave radiated from an antenna array cannot be treated as a planar wave (or a combination of planar waves) . Therefore, the design of massive MIMO in 5G NR may be inapplicable for XL-MIMO, and the use of XL-MIMO in 6G with near field requires new designs for channel model, transceiver architecture, channel estimation, transmission scheme, etc. For example, the DFT vector used under the planar wave assumption may no longer apply. The ideal beamforming vector needs to accommodate the non-planar EM wavefront and is very complicated. Therefore, it is very important to find a solution with low complexity to simplify the design and reduce the implementation cost.
  • Embodiments of the present disclosure provide solutions for transmitting one or more data layers from a large antenna array (e.g., ELAA) . More details will be described in the following text in combination with the appended drawings.
  • a large antenna array e.g., ELAA
  • the antenna array at a BS is a large antenna array (e.g., ELAA) and the antenna array at a UE is of a regular size. It is contemplated that the described solutions may be applicable to a UE with a large antenna array (e.g., ELAA) without departing from the spirit and scope of the present disclosure.
  • ELAA large antenna array
  • Figure 2 illustrates a flowchart of an exemplary method in accordance with aspects of the present disclosure.
  • the operations of the method illustrated in Figure 2 may be performed by a BS (e.g., NE 102 in Figure 1) as described herein or other apparatus with the like functions.
  • the BS may execute a set of instructions to control functional elements of the BS to perform the described operations or functions.
  • the BS may partition an antenna array (e.g., ELAA) into N subarrays, wherein N ⁇ 1, and each subarray of the antenna array includes a number of adjacent antennas and is associated with a respective beamforming vector.
  • an antenna array e.g., ELAA
  • the respective beamforming vector associated with each subarray of the N subarrays is a DFT beamforming vector, which may steer a beam associated with (e.g., transmitted from) the subarray towards a receiver (e.g., an antenna array) of a UE.
  • Figure 3 illustrates an example of transmission with an antenna array partitioned into subarrays in accordance with aspects of the present disclosure.
  • a one-dimensional antenna array of a BS is partitioned into N subarrays (e.g., labelled 0 to N-1) , wherein N ⁇ 1.
  • Each subarray consists of M adjacent antennas (e.g., labelled 0 to M-1) , wherein M ⁇ 1.
  • M M ⁇ 1.
  • M M ⁇ 1.
  • FIG. 3 a two-dimensional antenna array may be partitioned into multiple two-dimensional subarrays, and the described solutions for one-dimensional antenna arrays may be similarly applied in each dimension.
  • the antenna array at a UE is of a regular size and is not partitioned.
  • Subarray i (i ⁇ ⁇ 0, 1, ..., N-1 ⁇ ) of the antenna array of the BS may be associated with a beamforming vector steering towards the UE.
  • the line between the center of subarray i and the center of the antenna array of the UE may represent the direction of a signal transmitted from subarray i to the UE with the beamforming vector.
  • the angle of arrival (AOA) of the signal is which is the angle between the direction of the signal and the line that is vertical to the antenna array of the UE.
  • the angle of departure (AOD) of the signal is which is the angle between the direction of the signal and the line that is vertical to subarray i.
  • the BS may transmit N r data layers (e.g., in a physical downlink shared channel (PDSCH) ) from the antenna array, wherein N r ⁇ 1, and each subarray of the antenna array is used to transmit a single data layer of the N r data layers.
  • N r data layers e.g., in a physical downlink shared channel (PDSCH)
  • the corresponding received signal Y at the receiver may be represented as:
  • ⁇ i is a complex number representing the amplitude and phase for the channel of subarray i;
  • ⁇ M t is a number of antennas within subarray i
  • the BS may transmit DCI for scheduling the transmission of the N r data layers from the antenna array of the BS to the UE.
  • the DCI may indicate TCI states of the subarrays used for transmitting the N r data layers.
  • the UE may obtain Quasi co-location (QCL) parameter (s) for PDSCH and the associated demodulation reference signal (DMRS) reception.
  • the QCL parameter (s) may include at least one of Doppler shift, Doppler spread, average delay, delay spread or spatial receiver filter parameters for receiving signals. Since different subarrays may transmit signals to the UE with different downlink beams, each subarray may has its own TCI state.
  • Each TCI state may configure a downlink reference signal, e.g., a tracking reference signal (TRS) , for the UE to obtain the QCL parameter (s) for the PDSCH and the associated DMRS reception.
  • TRS tracking reference signal
  • the TCI states associated with the subarrays for transmitting the same data layer may form a TCI state group.
  • the DCI for scheduling the transmission of the N r data layers may indicate N r TCI state groups, wherein each TCI state group of the N r TCI state groups is associated with a respective subarray group which is used for transmitting a respective data layer of the N r data layers.
  • each TCI state group of the N r TCI state groups may include one or more TCI states, and each TCI state of the one or more TCI states is associated with a respective subarray used to transmit the respective data layer associated with the TCI state group.
  • the one or more TCI states included in each TCI state group of the N r TCI state groups are transmitted in the DCI.
  • each TCI state group of the N r TCI state groups is associated with a group index, and the group index associated with each TCI state group of the N r TCI state groups is transmitted in the DCI.
  • the BS may transmit the one or more TCI states included in each TCI state group of the N r TCI state groups via, e.g., an RRC or MAC-CE configuration message.
  • TCI i i ⁇ [0, 5]
  • TCI state groups and associated group indexes may be configured, specified or predefined.
  • Table 1 An example of the possible TCI state groups and associated group indexes is provided in the following Table 1:
  • the TCI state group may be ⁇ TCI 0 , TCI 1 , TCI 2 , TCI 3 , TCI 4 , TCI 5 ⁇ .
  • the DCI for scheduling the transmission of the data layer may contain all the TCI states in an order of TCI 0 , TCI 1 , TCI 2 , TCI 3 , TCI 4 , TCI 5 .
  • the DCI may contain the group index (e.g., 0 as listed in Table 1) associated with ⁇ TCI 0 , TCI 1 , TCI 2 , TCI 3 , TCI 4 , TCI 5 ⁇ , and the BS may transmit TCI 0 , TCI 1 , TCI 2 , TCI 3 , TCI 4 and TCI 5 in an RRC or MAC-CE configuration message.
  • group index e.g., 0 as listed in Table 1
  • a first TCI state group used for transmitting data layer 0 is ⁇ TCI 0 , TCI 1 , TCI 2 ⁇
  • a second TCI state group used for transmitting data layer 1 is ⁇ TCI 3 , TCI 4 , TCI 5 ⁇ .
  • the DCI may contain the TCI states in the form of two groups, wherein the first group contains TCI states in an order of TCI 0 , TCI 1 , TCI 2 , and the second group contains TCI states in an order of TCI 3 , TCI 4 , TCI 5 .
  • the DCI may contain two group indexes (e.g., 1 and 2 as listed in Table 1) respectively associated with the two TCI state groups, and the BS may transmit TCI 0 , TCI 1 , TCI 2 , TCI 3 , TCI 4 and TCI 5 in an RRC or MAC-CE configuration message.
  • a first TCI state group used for transmitting data layer 0 is ⁇ TCI 0 , TCI 2 , TCI 4 ⁇
  • a second TCI state group used for transmitting data layer 1 is ⁇ TCI 1 , TCI 3 , TCI 5 ⁇ .
  • the DCI may contain the TCI states in the form of two groups, wherein the first group contains TCI states in an order of TCI 0 , TCI 2 , TCI 4 , and the second group contains TCI 1 , TCI 3 , TCI 5 .
  • the DCI may contain two group indexes (e.g., 3 and 4 as listed in Table 1) respectively associated with the two TCI state groups, and the BS may transmit TCI 0 , TCI 1 , TCI 2 , TCI 3 , TCI 4 and TCI 5 in an RRC or MAC-CE configuration message.
  • Figure 6 illustrates a flowchart of an exemplary method in accordance with aspects of the present disclosure.
  • the operations of the method illustrated in Figure 6 may be performed by a UE (e.g., UE 104 in Figure 1) as described herein or other apparatus with the like functions.
  • the UE may execute a set of instructions to control functional elements of the BS to perform the described operations or functions.
  • the UE may receive, from a BS (e.g., NE 102 in Figure 1) , DCI scheduling transmission of N r data layers from an antenna array of the BS, wherein N r ⁇ 1, the antenna array includes N subarrays, N ⁇ 1, and each subarray of the antenna array includes a number of adjacent antennas and is associated with a respective TCI state.
  • a BS e.g., NE 102 in Figure 1
  • N r ⁇ 1 the antenna array includes N subarrays, N ⁇ 1
  • each subarray of the antenna array includes a number of adjacent antennas and is associated with a respective TCI state.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

Divers aspects de la présente divulgation concernent des procédés et des appareils de transmission avec des réseaux d'antennes extrêmement grands. Selon un mode de réalisation de la présente divulgation, une station de base (BS) peut comprendre : au moins une mémoire ; et au moins un processeur couplé à la ou aux mémoires et configuré pour amener la BS à : diviser un réseau d'antennes en N sous-réseaux, N ≥ 1, et chaque sous-réseau du réseau d'antennes comprenant un certain nombre d'antennes adjacentes et étant associé à un vecteur de formation de faisceau respectif ; et transmettre Nr couches de données à partir du réseau d'antennes, Nr ≥ 1, et chaque sous-réseau du réseau d'antennes étant utilisé pour transmettre une seule couche de données des Nr couches de données.
PCT/CN2024/115911 2024-08-30 2024-08-30 Procédés et appareils de transmission avec réseaux d'antennes extrêmement grands Pending WO2025145643A1 (fr)

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