WO2023144776A1 - Attribution dynamique de ports de signal de référence de démodulation (dmrs) pour entrée multiple sortie multiple multi-utilisateur (mu-mimo) en liaison descendante (dl) - Google Patents

Attribution dynamique de ports de signal de référence de démodulation (dmrs) pour entrée multiple sortie multiple multi-utilisateur (mu-mimo) en liaison descendante (dl) Download PDF

Info

Publication number
WO2023144776A1
WO2023144776A1 PCT/IB2023/050740 IB2023050740W WO2023144776A1 WO 2023144776 A1 WO2023144776 A1 WO 2023144776A1 IB 2023050740 W IB2023050740 W IB 2023050740W WO 2023144776 A1 WO2023144776 A1 WO 2023144776A1
Authority
WO
WIPO (PCT)
Prior art keywords
dmrs
cdm
cdm group
mimo wireless
network node
Prior art date
Application number
PCT/IB2023/050740
Other languages
English (en)
Inventor
Chaocheng TU
Kevin Luo
José Maria GARCIA PERERA
Yongquan Qiang
Xueying Hou
Original Assignee
Telefonaktiebolaget Lm Ericsson (Publ)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget Lm Ericsson (Publ) filed Critical Telefonaktiebolaget Lm Ericsson (Publ)
Publication of WO2023144776A1 publication Critical patent/WO2023144776A1/fr

Links

Classifications

    • 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
    • H04L5/0003—Two-dimensional division
    • 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
    • H04L5/0058—Allocation criteria
    • H04L5/0071—Allocation based on fairness other than the proportional kind
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/16—Code allocation

Definitions

  • DMRS DYNAMIC DEMODULATION REFERENCE SIGNAL
  • DL MULTI-USER MULTIPLE INPUT MULTIPLE OUTPUT
  • MU-MIMO DYNAMIC DEMODULATION REFERENCE SIGNAL
  • the present disclosure relates to wireless communications, and in particular, to reference signal port assignment.
  • the Third Generation Partnership Project (3 GPP) has developed and is developing standards for Fourth Generation (4G) (also referred to as Long Term Evolution (LTE)) and Fifth Generation (5G) (also referred to as New Radio (NR)) wireless communication systems.
  • 4G Fourth Generation
  • 5G Fifth Generation
  • Such systems provide, among other features, broadband communication between network nodes, such as base stations, and mobile wireless devices (WD), as well as communication between network nodes and between WDs.
  • demodulation reference signal For data transmission on physical downlink shared channel (PDSCH) in 5G NR, demodulation reference signal (DMRS) is used for channel estimation and demodulation at a receiver, e.g., a WD.
  • a receiver e.g., a WD.
  • Each layer for a WD is typically associated with an assigned DMRS port.
  • either single or multiple DMRS symbols, with one or more additional symbol associated with each DMRS symbol are reserved to form multiple DMRS ports.
  • FIG. 1 shows a typical “1 + 1” DMRS configuration, in which four DMRS ports can be formed from the given configuration.
  • the number of DMRS ports available is generally less than the total of co-scheduled layers. For example, four co-scheduled WDs with two layers per WD can support 8- layers transmissions in total. As shown in the “1+1” DMRS configuration example of FIG. 1, there are four DMRS ports available from this configuration. Given that each WD requires 2 DMRS ports each to support two-layer transmissions, it must follow that the four DMRS ports have to be assigned more than once to the co- scheduled WDs.
  • orthogonal (or different) DMRS ports may be preferred for WDs that are not spatially separated (i.e., not separated more than a predetermined separation parameter) for a predetermined channel estimation.
  • the DMRS ports may be reused since interference introduced from the same DMRS ports of the other WDs may be considered negligible.
  • DMRS ports (0,1), (0,2), or (2,3) are applicable if the number of DMRS CDM group(s) without data is two. Other combinations such as (0,3), (1,3), or (1,2) are not possible.
  • DMRS ports (0-2) are possible. Other combinations such as (1-3), (0,2,3), or (0,1,3) may not possible. In other words, allocation of a limited number of DMRS ports among co-scheduled layers follows the 3GPP specifications on a per WD basis as well.
  • DMRS port assignment and blind DMRS ports assignments sacrifices performance due to incurred interferences from re-used DMRS ports among multiple WDs.
  • PMI precoding matrix indicator
  • Some embodiments advantageously provide methods, systems, and apparatuses for determining (e.g., assigning) a signaling port such as a DMRS port).
  • the determined signaling port may be used in MU-MIMO networks.
  • at least a signaling port such as a DMRS port is determined (i.e., assigned) when a number of signaling ports (e.g., antenna ports) is limited and signaling ports for MU-MIMO WDs are re-used.
  • a method e.g., a systematic method to determine/assign DMRS ports for MU-MIMO WDs, specifically, taking at least one of the following factors into consideration: • WDs may be of different ranks (or different number of layers for downlink (DL) transmissions);
  • DMRS configurations may be different (e.g., not limited to how many DMRS ports in total are available);
  • Per-rank DMRS port(s) assignment i.e., the field “Antenna port(s)” from downlink control information (DCI) 1_1) may be a subset (e.g., a choice) from a plurality of choices; and
  • a spatial relationship of MU-MIMO WDs is established.
  • DMRS ports may be assigned per WD, on the basis of an order established from the spatial relationship. Weights or a number of occupancies of each DMRS port may be re-initialized (e.g., to 0) in the beginning of each time interval (e.g., each transmission time interval (TTI)).
  • TTI transmission time interval
  • the network node e.g., the gNB, performs at least one of the steps below, e.g., based on ranks of the WDs
  • Step 1 Check and apply balancing of multiplexing groups such as code division multiplexing (CDM) groups;
  • CDM code division multiplexing
  • Step 2 Check and apply balancing of at least one signaling port such as DMRS ports from the least occupied multiplexing group (e.g., CDM group) from Step 1; and
  • Step 3 Apply a least redundant multiplexing group (e.g., CDM group) and signaling ports (e.g., DMRS ports) such as by referring to a previous DMRS ports assignment (e.g., from a previous WD) if there is a tie following Step 1 and Step 2.
  • a least redundant multiplexing group e.g., CDM group
  • signaling ports e.g., DMRS ports
  • the network node may record selected DMRS ports for a next WD, e.g., until all the WDs have been considered.
  • the embodiments of the present disclosure are beneficial at least because interferences are minimized such as interferences from adjacent MU-MIMO WDs and/or DMRS ports configurations (e.g., WDs and/ DMRS ports configured based on 3GPP standards).
  • MU-MIMO WDs are supported by re-using signaling ports such as DMRS ports on based on a spatial relationship (e.g., established by pairwise PMIDs from channel state information (CSI) reports.
  • CSI channel state information
  • any transmission schemes may be used using the spatial relationship among WDs (e.g., MU-MIMO WDs).
  • WDs with different ranks, DMRS configurations, and per-rank DMRS port(s) assignment may be supported.
  • a network node in communication with a plurality of multiple user- multiple input multiple output, MU- MIMO, wireless devices includes processing circuitry configured to: determine an occupancy of a plurality of code division multiplexing, CDM, groups associated with the plurality of MU-MIMO wireless devices, select a first CDM group of the plurality of CDM groups based on the first CDM group being a least occupied CDM group of the plurality of CDM groups, determine an occupancy of demodulation reference signal, DMRS, ports for the first CDM group, and assign at least one DMRS port associated with the first CDM group to a first MU-MIMO wireless device of the plurality of MU-MIMO wireless devices based on the occupancy of DMRS ports for the first CDM group where the first MU-MIMO wireless device has a rank of 1 or 2.
  • the first CDM group is selected based on the first CDM group having fewer assigned DMRS ports than the remaining plurality of CDM groups.
  • the assignment of the at least one DMRS port associated with the first CDM group is based on the at least one DMRS port having fewer assignments than the remaining DMRS ports in the first CDM group.
  • the selection of the first CDM group is based on a rank of the first MU-MIMO wireless device.
  • the first CDM group has a same occupancy as a second CDM group of the plurality of CDM groups, where the plurality of DMRS ports in the first CDM group have a same DMRS port occupancy, and the assignment of the at least one DMRS port associated with the first CDM group is based on a at least one previous DMRS port assignment.
  • the first CDM group is a least redundant of the plurality of CDM groups when the at least one previous DMRS port assignment is considered, and the at least one DMRS port associated with the first CDM group is a least redundant of the plurality of DMRS ports when the at least one previous DMRS port assignment is considered.
  • the processing circuitry is further configured to cause transmission of DMRS in the at least one DMRS port associated with the first CDM group.
  • each of the plurality of MU-MIMO wireless devices are selected for DMRS port assignment according to an ordering that is based on a spatial relationship of the plurality of MU-MIMO wireless devices.
  • the spatial relationships are based on at least one of: information included in channel state information, CSI, reports associated with the MU-MIMO wireless devices, and pairwise orthogonality of channel responses associated with the plurality of MU-MIMO wireless devices.
  • the processing circuitry is further configured to assign at least one DMRS port to a second MU-MIMO wireless device of the plurality of MU-MIMO wireless devices based on: an updated occupancy of a plurality of CDM groups, an updated occupancy of DMRS ports for one of the plurality of CDM groups, and the updated occupancies being based on the at least one DMRS port assigned to the first MU-MIMO wireless device.
  • the processing circuitry is further configured to assign predefined DMRS ports to a second MU-MIMO wireless device of the plurality of MU-MIMO wireless devices based on the second MU-MIMO wireless device having a rank of 3 or 4.
  • a method implemented by a network node that is in communication with a plurality of multiple user-multiple input multiple output, MU-MIMO, wireless devices is provided.
  • An occupancy of a plurality of code division multiplexing, CDM, groups associated with the plurality of MU-MIMO wireless devices is determined.
  • a first CDM group of the plurality of CDM groups is selected based on the first CDM group being a least occupied CDM group of the plurality of CDM groups.
  • An occupancy of demodulation reference signal, DMRS, ports for the first CDM group is determined.
  • At least one DMRS port associated with the first CDM group is assigned to a first MU-MIMO wireless device of the plurality of MU-MIMO wireless devices based on the occupancy of DMRS ports for the first CDM group, the first MU-MIMO wireless device having a rank of 1 or 2.
  • the first CDM group is selected based on the first CDM group having fewer assigned DMRS ports than the remaining plurality of CDM groups.
  • the assignment of the at least one DMRS port associated with the first CDM group is based on the at least one DMRS port having fewer assignments than the remaining DMRS ports in the first CDM group.
  • the selection of the first CDM group is based on a rank of the first MU-MIMO wireless device.
  • the first CDM group has a same occupancy as a second CDM group of the plurality of CDM groups, where the plurality of DMRS ports in the first CDM group have a same DMRS port occupancy, and where the assignment of the at least one DMRS port associated with the first CDM group is based on a at least one previous DMRS port assignment.
  • the first CDM group is a least redundant of the plurality of CDM groups when the at least one previous DMRS port assignment is considered, and where the at least one DMRS port associated with the first CDM group is a least redundant of the plurality of DMRS ports when the at least one previous DMRS port assignment is considered.
  • transmission is caused of DMRS in the at least one DMRS port associated with the first CDM group.
  • each of the plurality of MU-MIMO wireless devices are selected for DMRS port assignment according to an ordering that is based on a spatial relationship of the plurality of MU-MIMO wireless devices.
  • the spatial relationships are based on at least one of: information included in channel state information, CSI, reports associated with the MU-MIMO wireless devices, and pairwise orthogonality of channel responses associated with the plurality of MU-MIMO wireless devices.
  • at least one DMRS port is assigned to a second MU-MIMO wireless device of the plurality of MU-MIMO wireless devices based on: an updated occupancy of a plurality of CDM groups, an updated occupancy of DMRS ports for one of the plurality of CDM groups, and where the updated occupancies is based on the at least one DMRS port assigned to the first MU-MIMO wireless device.
  • predefined DMRS ports are assigned to a second MU-MIMO wireless device of the plurality of MU-MIMO wireless devices based on the second MU-MIMO wireless device having a rank of 3 or 4.
  • FIG. 1 shows example DMRS ports for a typical 1+1 DMRS configuration
  • FIG. 2 shows a schematic diagram of an example network architecture illustrating a communication system according to principles disclosed herein;
  • FIG. 3 shows a block diagram of a network node in communication with a wireless device over a wireless connection according to some embodiments of the present disclosure
  • FIG. 4 shows a flowchart of an example process in a network node according to some embodiments of the present disclosure
  • FIG. 5 shows a flowchart of an example process in a wireless device according to some embodiments of the present disclosure
  • FIG. 6 shows a flowchart of another example process in a network node according to some embodiments of the present disclosure
  • FIG. 7 shows an example network node in a MU-MIMO environment according to some embodiments of the present disclosure
  • FIG. 8 shows an example method of balancing groups and/or signaling ports and determining least redundant groups and/or signaling ports according to some embodiments of the present disclosure
  • FIG. 9 shows an example diagram for signaling port selection according to some embodiments of the present disclosure.
  • FIG. 10 shows another example diagram for signaling port selection according to some embodiments of the present disclosure.
  • FIG. 11 shows an example 0-RAN implementation for signaling port assignment (e.g., dynamic DMRS ports assignment) according to some embodiments of the present disclosure.
  • the embodiments reside primarily in combinations of apparatus components and processing steps related to determining (e.g., assigning) one or more signaling ports such as a DMRS ports such as a signaling port used to communicate with a wireless device.
  • the determined signaling port may be used in MU-MIMO networks Accordingly, components have been represented where appropriate by conventional symbols in the drawings, showing only those specific details that are pertinent to understanding the embodiments so as not to obscure the disclosure with details that will be readily apparent to those of ordinary skill in the art having the benefit of the description herein.
  • relational terms such as “first” and “second,” “top” and “bottom,” and the like, may be used solely to distinguish one entity or element from another entity or element without necessarily requiring or implying any physical or logical relationship or order between such entities or elements.
  • the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the concepts described herein.
  • the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise.
  • the joining term, “in communication with” and the like may be used to indicate electrical or data communication, which may be accomplished by physical contact, induction, electromagnetic radiation, radio signaling, infrared signaling or optical signaling, for example.
  • electrical or data communication may be accomplished by physical contact, induction, electromagnetic radiation, radio signaling, infrared signaling or optical signaling, for example.
  • Coupled may be used herein to indicate a connection, although not necessarily directly, and may include wired and/or wireless connections.
  • network node can be any kind of network node comprised in a radio network which may further comprise any of base station (BS), radio base station, base transceiver station (BTS), base station controller (BSC), radio network controller (RNC), g Node B (gNB), evolved Node B (eNB or eNodeB), Node B, multi- standard radio (MSR) radio node such as MSR BS, multi-cell/multicast coordination entity (MCE), relay node, donor node controlling relay, radio access point (AP), transmission points, transmission nodes, Remote Radio Unit (RRU) Remote Radio Head (RRH), a core network node (e.g., mobile management entity (MME), self-organizing network (SON) node, a coordinating node, positioning node, MDT node, etc.), an external node (e.g., 3rd party node, a node external to the current network), nodes in distributed antenna system (DAS), a spectrum access system (SAS) no
  • BS base station
  • wireless device or a user equipment (UE) are used interchangeably.
  • the WD herein can be any type of wireless device capable of communicating with a network node or another WD over radio signals, such as wireless device (WD).
  • the WD may also be a radio communication device, target device, device to device (D2D) WD, machine type WD or WD capable of machine to machine communication (M2M), low-cost and/or low-complexity WD, a sensor equipped with WD, Tablet, mobile terminals, smart phone, laptop embedded equipped (LEE), laptop mounted equipment (LME), USB dongles, Customer Premises Equipment (CPE), an Internet of Things (loT) device, or a Narrowband loT (NB-IOT) device etc.
  • D2D device to device
  • M2M machine to machine communication
  • M2M machine to machine communication
  • Tablet mobile terminals
  • smart phone laptop embedded equipped (LEE), laptop mounted equipment (LME), USB dongles
  • CPE Customer Premises Equipment
  • LME Customer Premises Equipment
  • NB-IOT Narrowband loT
  • radio network node can be any kind of a radio network node which may comprise any of base station, radio base station, base transceiver station, base station controller, network controller, RNC, evolved Node B (eNB), Node B, gNB, Multi-cell/multicast Coordination Entity (MCE), relay node, access point, radio access point, Remote Radio Unit (RRU) Remote Radio Head (RRH).
  • RNC evolved Node B
  • MCE Multi-cell/multicast Coordination Entity
  • RRU Remote Radio Unit
  • RRH Remote Radio Head
  • any one of the network node and the WD may include one or more signaling ports which may be part of at least one of an antenna, antenna equipment, active antenna system (AAS), MU-MIMO, radio interface, communication interface, processing circuitry, and a standalone device.
  • One or more signaling ports may be configured to communicate at least with another network node, a wireless device, and any other type of device.
  • one or more signaling ports may be configured to transmit/receive any type of signal such as reference signals, including but not limited to reference signals (e.g., demodulation reference signal (DMRS), phase tracking reference signal (PTRS), sounding reference signal (SRS), channel state information reference signal (CSLRS)).
  • DMRS demodulation reference signal
  • PTRS phase tracking reference signal
  • SRS sounding reference signal
  • CSLRS channel state information reference signal
  • radio node used herein may be used to also denote a wireless device (WD) such as a wireless device (WD) or a radio network node.
  • balancing may refer to determining at least an occupancy (e.g., assignments such as possible assignments, existing assignments, potential assignments) associated with at least one group such as each multiplexing group (e.g., CDM groups) and/or at least one signaling port and/or any other parameter. Further, balancing may refer to as determining assignments that make occupancies (e.g., the number of occupancies) equal (or tending to equalize occupancies) across groups and/or signaling ports and/or other parameters.
  • occupancy e.g., assignments such as possible assignments, existing assignments, potential assignments
  • balancing may refer to as determining assignments that make occupancies (e.g., the number of occupancies) equal (or tending to equalize occupancies) across groups and/or signaling ports and/or other parameters.
  • WCDMA Wide Band Code Division Multiple Access
  • WiMax Worldwide Interoperability for Microwave Access
  • UMB Ultra Mobile Broadband
  • GSM Global System for Mobile Communications
  • functions described herein as being performed by a wireless device or a network node may be distributed over a plurality of wireless devices and/or network nodes.
  • the functions of the network node and wireless device described herein are not limited to performance by a single physical device and, in fact, can be distributed among several physical devices.
  • FIG. 2 a schematic diagram of a communication system 10 (e.g., MU-MIMO system, O-RAN, etc.), according to an embodiment, such as a 3 GPP-type cellular network that may support standards such as LTE and/or NR (5G), which comprises an access network 12, such as a radio access network, and a core network 14.
  • a communication system 10 e.g., MU-MIMO system, O-RAN, etc.
  • a 3 GPP-type cellular network that may support standards such as LTE and/or NR (5G), which comprises an access network 12, such as a radio access network, and a core network 14.
  • LTE Long Term Evolution
  • 5G NR
  • the access network 12 comprises a plurality of network nodes 16a, 16b, 16c (referred to collectively as network nodes 16), such as NBs, eNBs, gNBs or other types of wireless access points, each defining a corresponding coverage area 18a, 18b, 18c (referred to collectively as coverage areas 18).
  • Each network node 16a, 16b, 16c is connectable to the core network 14 over a wired or wireless connection 20.
  • a first wireless device (WD) 22a located in coverage area 18a is configured to wirelessly connect to, or be paged by, the corresponding network node 16a.
  • a second WD 22b in coverage area 18b is wirelessly connectable to the corresponding network node 16b.
  • wireless devices 22 While a plurality of WDs 22a, 22b (collectively referred to as wireless devices 22) are illustrated in this example, the disclosed embodiments are equally applicable to a situation where a sole WD is in the coverage area or where a sole WD is connecting to the corresponding network node 16. Note that although only two WDs 22 and three network nodes 16 are shown for convenience, the communication system may include many more WDs 22 and network nodes 16.
  • a WD 22 can be in simultaneous communication and/or configured to separately communicate with more than one network node 16 and more than one type of network node 16.
  • a WD 22 can have dual connectivity with a network node 16 that supports LTE and the same or a different network node 16 that supports NR.
  • WD 22 can be in communication with an eNB for LTE/E-UTRAN and a gNB for NR/NG-RAN.
  • a network node 16 (eNB or gNB) is configured to include a node assignment unit 24 which is configured to perform any of the methods, process, steps, tasks, and features described herein, e.g., determine at least one of a first balancing of at least one multiplexing group and a second balancing of at least one signaling port associated with the WD based at least in part on the determined first balancing.
  • a wireless device 22 is configured to include a WD assignment unit 26 which is configured to perform any of the methods, process, steps, tasks, and features described herein, e.g., determine a signal transmitted by the network node using at least one signaling port, the signal being based on at least one of a first balancing of at least one multiplexing group, a second balancing of the at least one signaling port, and a least redundancy of the at least one multiplexing group and the at least one signaling port.
  • Example implementations, in accordance with an embodiment, of the WD 22 and network node 16 discussed in the preceding paragraphs will now be described with reference to FIG. 3.
  • the communication system 10 includes a network node 16 provided in a communication system 10 and including hardware 28 enabling it to communicate with the WD 22.
  • the hardware 28 may include a radio interface 30 for setting up and maintaining at least a wireless connection 32 with a WD 22 located in a coverage area 18 served by the network node 16.
  • the radio interface 30 may be formed as or may include, for example, one or more RF transmitters, one or more RF receivers, and/or one or more RF transceivers.
  • the radio interface 30 includes an array of antennas 34 to radiate and receive signal(s) carrying electromagnetic waves.
  • Antennas 34 may include and/or refer to at least one signaling port as described herein.
  • the hardware 28 of the network node 16 further includes processing circuitry 36.
  • the processing circuitry 36 may include a processor 38 and a memory 40.
  • the processing circuitry 36 may comprise integrated circuitry for processing and/or control, e.g., one or more processors and/or processor cores and/or FPGAs (Field Programmable Gate Array) and/or ASICs (Application Specific Integrated Circuitry) adapted to execute instructions.
  • the processor 38 may be configured to access (e.g., write to and/or read from) the memory 40, which may comprise any kind of volatile and/or nonvolatile memory, e.g., cache and/or buffer memory and/or RAM (Random Access Memory) and/or ROM (Read-Only Memory) and/or optical memory and/or EPROM (Erasable Programmable Read-Only Memory).
  • the memory 40 may comprise any kind of volatile and/or nonvolatile memory, e.g., cache and/or buffer memory and/or RAM (Random Access Memory) and/or ROM (Read-Only Memory) and/or optical memory and/or EPROM (Erasable Programmable Read-Only Memory).
  • the network node 16 further has software 42 stored internally in, for example, memory 40, or stored in external memory (e.g., database, storage array, network storage device, etc.) accessible by the network node 16 via an external connection.
  • the software 42 may be executable by the processing circuitry 36.
  • the processing circuitry 36 may be configured to control any of the methods and/or processes described herein and/or to cause such methods, and/or processes to be performed, e.g., by network node 16.
  • Processor 38 corresponds to one or more processors 38 for performing network node 16 functions described herein.
  • the memory 40 is configured to store data, programmatic software code and/or other information described herein.
  • the software 42 may include instructions that, when executed by the processor 38 and/or processing circuitry 36, causes the processor 38 and/or processing circuitry 36 to perform the processes described herein with respect to network node 16.
  • processing circuitry 36 of the network node 16 may include a node assignment unit 24 which is configured to perform any of the methods, process, steps, tasks, and features described herein, e.g., determine at least one of a first balancing of at least one multiplexing group and a second balancing of at least one signaling port associated with the WD based at least in part on the determined first balancing.
  • network node 16 may include at least one distributed unit (DU) 60 and/or at least one radio unit (RU) 62. Any one of DU 60 and/or RU 62 may be configured to communicate with any one of the elements/components of communication system 10, e.g., of network node 16 and/or WD 22.
  • DU 60 may refer to any distributed unit such as NR DU, Open Radio Access Network ZORAN) DU, etc.
  • RU 62 may refer to any radio unit such as NR RU, O-RAN RU, etc.
  • DU 60 may be configured to communicate with RU 62 on a lower layer split (LLS) such as LLS- User Plane (LLS-UP) and/or transmit/receive data (e.g., MU- MIMO data) which may include associated signaling ports (e.g., DMRS ports).
  • LLC-UP LLS- User Plane
  • DU 60 may also be configured to communicate with RU 62 on an LLS-CU and/or transmit/receive at least one PMI from/associated with WD 22.
  • RU 62 may be configured to communicate with DU 60 on LLS such as LLS- UP and/or transmit/receive data (e.g., MU-MIMO data) which may include associated signaling ports (e.g., DMRS ports).
  • RU 62 may also be configured to communicate with DU 60 on an LLS-CU and/or transmit/receive at least one PMI from/associated with WD 22.
  • Network node 16 may also include at least one centralized unit (CU) configured to communicate with any one of the elements/components of communication system 10, e.g., of network node 16 and/or WD 22.
  • WD 22 may include (and/or perform the features of) at least one unit such as the DU 60, RU 62, and a CU.
  • the communication system 10 further includes the WD 22 already referred to.
  • the WD 22 may have hardware 44 that may include a radio interface 46 configured to set up and maintain a wireless connection 32 with a network node 16 serving a coverage area 18 in which the WD 22 is currently located.
  • the radio interface 46 may be formed as or may include, for example, one or more RF transmitters, one or more RF receivers, and/or one or more RF transceivers.
  • the radio interface 46 includes an array of antennas 48 to radiate and receive signal(s) carrying electromagnetic waves.
  • Antennas 48 may include and/or refer to at least one signaling port as described herein.
  • the hardware 44 of the WD 22 further includes processing circuitry 50.
  • the processing circuitry 50 may include a processor 52 and memory 54.
  • the processing circuitry 50 may comprise integrated circuitry for processing and/or control, e.g., one or more processors and/or processor cores and/or FPGAs (Field Programmable Gate Array) and/or ASICs (Application Specific Integrated Circuitry) adapted to execute instructions.
  • the processor 52 may be configured to access (e.g., write to and/or read from) memory 54, which may comprise any kind of volatile and/or nonvolatile memory, e.g., cache and/or buffer memory and/or RAM (Random Access Memory) and/or ROM (Read-Only Memory) and/or optical memory and/or EPROM (Erasable Programmable Read-Only Memory).
  • memory 54 may comprise any kind of volatile and/or nonvolatile memory, e.g., cache and/or buffer memory and/or RAM (Random Access Memory) and/or ROM (Read-Only Memory) and/or optical memory and/or EPROM (Erasable Programmable Read-Only Memory).
  • the WD 22 may further comprise software 56, which is stored in, for example, memory 54 at the WD 22, or stored in external memory (e.g., database, storage array, network storage device, etc.) accessible by the WD 22.
  • the software 56 may be executable by the processing circuitry 50.
  • the software 56 may include a client application 58.
  • the client application 58 may be operable to provide a service to a human or non-human user via the WD 22.
  • the processing circuitry 50 may be configured to control any of the methods and/or processes described herein and/or to cause such methods, and/or processes to be performed, e.g., by WD 22.
  • the processor 52 corresponds to one or more processors 52 for performing WD 22 functions described herein.
  • the WD 22 includes memory 54 that is configured to store data, programmatic software code and/or other information described herein.
  • the software 56 and/or the client application 58 may include instructions that, when executed by the processor 52 and/or processing circuitry 50, causes the processor 52 and/or processing circuitry 50 to perform the processes described herein with respect to WD 22.
  • the processing circuitry 50 of the wireless device 22 may include a WD assignment unit 26 which is configured to perform any of the methods, process, steps, tasks, and features described herein, e.g., determine a signal transmitted by the network node using at least one signaling port, the signal being based on at least one of a first balancing of at least one multiplexing group, a second balancing of the at least one signaling port, and a least redundancy of the at least one multiplexing group and the at least one signaling port.
  • a WD assignment unit 26 which is configured to perform any of the methods, process, steps, tasks, and features described herein, e.g., determine a signal transmitted by the network node using at least one signaling port, the signal being based on at least one of a first balancing of at least one multiplexing group, a second balancing of the at least one signaling port, and a least redundancy of the at least one multiplexing group and the at least one signaling port.
  • the inner workings of the network node 16 and WD 22 may be as shown in FIG. 3 and independently, the surrounding network topology may be that of FIG. 2.
  • the wireless connection 32 between the WD 22 and the network node 16 is in accordance with the teachings of the embodiments described throughout this disclosure. More precisely, the teachings of some of these embodiments may improve the data rate, latency, and/or power consumption and thereby provide benefits such as reduced user waiting time, relaxed restriction on file size, better responsiveness, extended battery lifetime, etc. In some embodiments, a measurement procedure may be provided for the purpose of monitoring data rate, latency and other factors on which the one or more embodiments improve.
  • FIGS. 2 and 3 show various “units” such as node assignment unit 24 and WD assignment unit 26 as being within a respective processor, it is contemplated that these units may be implemented such that a portion of the unit is stored in a corresponding memory within the processing circuitry. In other words, the units may be implemented in hardware or in a combination of hardware and software within the processing circuitry.
  • FIG. 4 is a flowchart of an example process (i.e., method) in a network node 16.
  • One or more blocks described herein may be performed by one or more elements of network node 16 such as by one or more of processing circuitry 36 (including the node assignment unit 24), processor 38, and/or radio interface 30.
  • Network node 16 such as via processing circuitry 36 and/or processor 38 and/or radio interface 30 is configured to determine (Block S100) a first balancing of at least one multiplexing group and/or a second balancing of at least one signaling port associated with the WD 22 based at least in part on the determined first balancing.
  • At least one of: a least redundancy of the at least one multiplexing group and the at least one signaling port is determined based on at least one of the determined first balancing and second balancing; and a signal based on at least one of the first balancing, the second balancing, and the least redundancy is transmitted, the signal being transmitted to the WD 22 using the at least one signaling port.
  • determining the first balancing may include at least one of: receiving a WD list including a plurality of spatial locations associated at least with the WD; determining whether the at least one multiplexing group is balanced; and determining a least occupied multiplexing group from the at least one multiplexing group.
  • Determining the second balancing may include determining a least occupied signaling port from the at least one signaling port based at least in part on the determined least occupied multiplexing group.
  • the at least one multiplexing group may be at least one code division multiplexing, CDM, group; and the least one signaling port may be at least one DMRS port.
  • FIG. 5 is a flowchart of an example process in a wireless device 22 according to some embodiments of the present disclosure.
  • One or more blocks described herein may be performed by one or more elements of wireless device 22 such as by one or more of processing circuitry 50 (including the WD assignment unit 26), processor 52, and/or radio interface 46.
  • Wireless device 22 such as via processing circuitry 50 and/or processor 52 and/or radio interface 46 is configured to determine (Block S102) a signal transmitted by the network node 16 using at least one signaling port, the signal being based on at least one of a first balancing of at least one multiplexing group, a second balancing of the at least one signaling port, and a least redundancy of the at least one multiplexing group and the at least one signaling port.
  • the first balancing may be based on least one of: a WD list including a plurality of spatial locations associated at least with the WD; whether the at least one multiplexing group is balanced; and a least occupied multiplexing group from the at least one multiplexing group; and the second balancing may be based on a least occupied signaling port of the at least one signaling port, the least occupied signaling port being based at least in part on the least occupied multiplexing group.
  • another signal including information associated a spatial location of the WD 22 is transmitted, the information being usable to determine the WD list.
  • the at least one multiplexing group may be at least one code division multiplexing, CDM, group; and the least one signaling port may be at least one DMRS port.
  • FIG. 6 is a flowchart of another example process (i.e., method) in a network node 16.
  • the network node may be in communication with a plurality of multipleinput multiple output (MIMO) wireless devices 22.
  • MIMO multipleinput multiple output
  • One or more blocks described herein may be performed by one or more elements of network node 16 such as by one or more of processing circuitry 36 (including the node assignment unit 24), processor 38, and/or radio interface 30.
  • Network node 16 is configured to determine (Block S104) an occupancy of a plurality of code division multiplexing, CDM, groups associated with the plurality of MU-MIMO wireless devices 22, as described herein.
  • CDM code division multiplexing
  • Network node 16 is configured to select (Block S106) a first CDM group of the plurality of CDM groups based on the first CDM group being a least occupied CDM group of the plurality of CDM groups, as described herein.
  • Network node 16 is configured to determine (Block S108) an occupancy of demodulation reference signal, DMRS, ports for the first CDM group, as described herien.
  • Network node 16 is configured to assign (Block S 110) at least one DMRS port associated with the first CDM group to a first MU-MIMO wireless device of the plurality of MU-MIMO wireless devices based on the occupancy of DMRS ports for the first CDM group where the first MU-MIMO wireless device has a rank of 1 or 2, as described herein.
  • the first CDM group is selected based on the first CDM group having fewer assigned DMRS ports than the remaining plurality of CDM groups.
  • the assignment of the at least one DMRS port associated with the first CDM group is based on the at least one DMRS port having fewer assignments than the remaining DMRS ports in the first CDM group.
  • the selection of the first CDM group is based on a rank of the first MU-MIMO wireless device 22.
  • the first CDM group has a same occupancy as a second CDM group of the plurality of CDM groups, where the plurality of DMRS ports in the first CDM group have a same DMRS port occupancy, and the assignment of the at least one DMRS port associated with the first CDM group is based on a at least one previous DMRS port assignment.
  • the first CDM group is a least redundant of the plurality of CDM groups when the at least one previous DMRS port assignment is considered, and the at least one DMRS port associated with the first CDM group is a least redundant of the plurality of DMRS ports when the at least one previous DMRS port assignment is considered.
  • the processing circuitry 36 is further configured to cause transmission of DMRS in the at least one DMRS port associated with the first CDM group.
  • each of the plurality of MU-MIMO wireless devices 22 are selected for DMRS port assignment according to an ordering that is based on a spatial relationship of the plurality of MU-MIMO wireless devices 22.
  • the spatial relationships are based on at least one of: information included in channel state information, CSI, reports associated with the MU-MIMO wireless devices 22, and pairwise orthogonality of channel responses associated with the plurality of MU-MIMO wireless devices 22.
  • the processing circuitry 36 is further configured to assign at least one DMRS port to a second MU-MIMO wireless device 22 of the plurality of MU-MIMO wireless devices 22 based on: an updated occupancy of a plurality of CDM groups, an updated occupancy of DMRS ports for one of the plurality of CDM groups, and the updated occupancies being based on the at least one DMRS port assigned to the first MU-MIMO wireless device 22.
  • the processing circuitry 36 is further configured to assign predefined DMRS ports to a second MU-MIMO wireless device 22 of the plurality of MU- MIMO wireless devices 22 based on the second MU-MIMO wireless device 22 having a rank of 3 or 4.
  • FIG. 7 shows an example network node in a MU-MIMO environment.
  • each WD 22 e.g., WDs 22a, 22b, 22n
  • network node 16 e.g., gNB
  • the spatial relationship may be established based on the pairwise orthogonality from the channel responses between the WDs 22 in consideration.
  • the spatial relationship is established.
  • WDs 22 in the MU-MIMO group may be queued in an order from network node 16 (e.g., from a perspective of the network node) based on the spatial relationship.
  • network node 16 may be configured to assign limited signaling ports (e.g., DMRS ports) such that WDs 22 occupy signaling ports (e.g., DMRS ports) that are interfered less than a predetermined amount (e.g., as little as possible to achieve a predetermined performance).
  • FIG. 8 shows an example method of balancing groups and/or signaling ports and determining least redundant groups and/or signaling ports according to some embodiments of the present disclosure.
  • An input may be a list of WDs 22 (e.g., a sorted list) with respect to spatial locations. In one nonlimiting example, a spatial relationship for MU-MIMO WDs 22 is assumed to established.
  • network node 16 may be configured to determine (e.g., arrive at) the following conditions for assigning one or more signaling ports (DMRS ports) for each WD 22: available signaling ports (DMRS ports); and quantity/number of multiplexing groups (e.g., CDM groups).
  • DMRS ports signaling ports
  • CDM groups quantity/number of multiplexing groups
  • available options may be restricted as a condition for DMRS assignment (i.e., signaling port assignment). That is, network node 16 may be configured to determine available signaling port assignments (e.g., DMRS assignments) based on:
  • available choices for rank-2 DMRS assignment may include (0,1), (2,3), and (0,2) which corresponds to a “value” field from a table as 7, 8, and 11, respectively.
  • network node 16 may be configured (e.g., for performance or implementation considerations) to restrict available rank-2 DMRS assignment to include (0,1) and (2,3), but not (0,2).
  • Weights (and/or a number of occupancies) of each signaling port may be re-initialized to a predetermined value (e.g., 0) with respect to a time interval (e.g., at the beginning of each TTI).
  • a predetermined value e.g., 0
  • network node 16 may be configured to perform at least one of the steps shown in FIG. 8 and/or assign DMRS port(s) based on options listed in a table (e.g., Table 7.3.1.2.2-1 to Table 7.3.1.2.2-4 in 3GPP Technical Specification (TS) 38.212 V15.12.0) and WD rank.
  • Network node 16 may be configured to select a least one signaling port (e.g., DMRS port). The selected signaling may be recorded accordingly for the next DMRS assignment (e.g., associated with a WD 22) such as until all WDs have been considered. More specifically:
  • Step 200 Determine (e.g., check and/or apply) balancing of CDM groups.
  • Network node 16 may be configured to determine (e.g., first check) whether the CDM groups are balanced or not, and then choose the CDM group that is the least occupied (e.g., if applicable). When there are more than one CDM group that are least occupied, then network node 16 may determine (e.g., choose) one that is first available. “Balancing of CDM groups” may refer to determining whether the number of occupancies for the CDM groups in consideration are the same (and/or performing one or more steps to make the same).
  • CDM group 0 e.g., DMRS ports 0,1
  • CDM group 1 e.g., DMRS ports 2,3
  • CDM group 0 e.g., DMRS ports 0
  • CDM group 1 e.g., DMRS ports 2,3
  • the CDM group 0 has a total weight of 2
  • the CDM group 1 has a total wright of 1.
  • the DMRS assignment of the WD 22 may be taken from the least occupied CDM group, e.g., CDM group 1 in this case.
  • network node 16 may be configured to skip balancing of CDM groups (e.g., becomes irrelevant), and DMRS ports may be assigned as (0-2) and (0-3), respectively.
  • DMRS ports may be predefined or preconfigured for the respective rank.
  • Step 202 Determine (e.g., check and/or apply) balancing of DMRS ports from the least occupied CDM group from Step 200.
  • DMRS ports are chosen from the least CDM group, which is the CDM group 1. From CDM group 1, DMRS port 2 has been taken at least once before, but DMRS port 3 has not been taken. Therefore, the DMRS port assignment will be taken from the least occupied DMRS port from the least occupied CDM group, which is DMRS port 3 in this nonlimiting example. “Balancing of DMRS ports” may refer to determining whether the number of occupancies for the DMRS ports in consideration are the same (and/or performing one or more steps to make the same).
  • Step 204 Determine (e.g., apply) the least redundant CDM group and DMRS port(s), e.g., by referring to the previous DMRS ports assignment such as if there is a tie following steps S200 and S202. In some embodiments, step 204 may be performed even if there is not tie. In cases (e.g., from both steps S200 and S202) where CDM groups and DMRS ports are balanced, the DMRS assignment may be chosen based on the least redundant CDM groups and/or DMRS ports such as by referring to the previous DMRS assignment.
  • the new DMRS ports may be assigned from the first CDM group (i.e., the least redundant to the previous assignment, and the same for the notion for DMRS ports within the CDM group).
  • the new DMRS ports may not be assigned from the first CDM group (i.e., these are not the least redundant to the previous assignment, and the same for the notion for DMRS ports within the CDM group).
  • steps S200-S204 are shown in a particular order, it is noted that the network node 16 may be configured to perform at least one of steps S200-S204 in any order or not perform any of these steps. In other words, the order of the steps shown is not required and not all steps are required to be performed.
  • some WDs 22 have been assigned DMRS ports already, and currently each DMRS port has a total weight of 2, or equivalently each CDM group has a total weight of 4.
  • network node 16 may be configured to resort to (i.e., perform) S204 since there is a tie from both S200 and S202. If the previous WD 22 has a rank-2 taking DMRS ports (0,1), then the current rank-2 WD may take DMRS ports (2,3) to avoid re-assigning the DMRS ports (0,1) again immediately following the previous WD DMRS assignment.
  • the current rank-2 WD 22 may also take DMRS ports (2,3) such as to avoid re-assigning the DMRS ports from the same CDM group again, e.g., immediately following the previous WD DMRS assignment.
  • network node may be configured to assign the DMRS ports in the ordered MU-MIMO group, from the first WD 22 until the last WD 22.
  • the network node is not limited to being configured to include the nonlimiting pseudo code and may be configured in any other way.
  • the example is based on the “1+1” DMRS configuration. There are up to four DMRS ports available (or equivalently 2 CDM groups) in total for the MU-MIMO group in consideration. Available per-rank DMRS port(s) assignment may be in any way including as listed below:
  • Nonlimiting example of pseudo code (UE as used in the pseudo code may refer to WD)
  • ueDmrsPortAlloc[0], ueDmrsPortAlloc[l], ueDmrsPortAlloc[2], and ueDmrsPortAlloc[3] are for the purpose of checking whether DMRS ports and two CDM groups are balanced or not for the next port assignments.
  • the initial value of those variables may be 0 and/or re-initialized per TTI.
  • the spatial relationship of four MU-MIMO WDs 22 in consideration are established by the order of WDO, WD1, WD2, and WD3.
  • the DMRS configuration is “1+1” and WDs 22 are all with 2-layer DL transmissions.
  • network node 16 may be configured to consider (e.g., only) DMRS ports (0,1) and (2,3) for 2-layer transmissions.
  • FIGS. 9 and 10 show diagrams (e.g., a Trellis diagram) of DMRS ports assignments (e.g., all possible DMRS ports assignments) for four WDs 22 from the corresponding rank combinations, according to the principles of the present disclosure such as the principle of CDM groups and DMRS ports.
  • DMRS ports assignments e.g., all possible DMRS ports assignments
  • the ranks of (WDO, WD1, WD2, WD3) are given as (1, 1, 1, 1).
  • DMRS ports corresponding to WD0-WD3 may be given as [0], [2], [1], [3], which is the top branch of FIG. 9.
  • the ranks of (WDO, WD1, WD2, WD3) are given as (2, 2, 2, 2).
  • DMRS ports corresponding to WD0-WD3 may be given as [0 1], [2 3], [0 1], [2 3], which is the bottom branch from FIG. 10.
  • WDO, WD1, WD2, WD3 may refer to WDs 22a, 22b, 22c, 22d.
  • DMRS ports selection (i.e., determination) for downlink (DL) MU-MIMO may be implemented in 0-RAN, e.g., 0-DU in ORAN architecture as shown in FIG. 11.
  • 0-RAN e.g., 0-DU in ORAN architecture as shown in FIG. 11.
  • PMI’s from WDs 22 may be indicated from any one of RUs 62a, 62b to DU 60 per (and/or included in a) CSI report.
  • the PMI information and/or other similar measure such as pairwise orthogonality check for channel correlation may be decoded in DU 60 (e.g., 0-DU).
  • DU 60 e.g., 0-DU
  • PDSCH from MU-MIMO WDs 22 with the associated DMRS ports are sent from DU 60 (e.g., 0-DU) to any one of RU 62a, 62b (e.g., first and second O-RUs).
  • PDSCH and PDSCH DMRS may be applied to the same precoding.
  • Any RU 62 may be of any category.
  • both 0-RU Category A Non-precoding 0-RAN Radio Unit
  • Category B Precoding 0-RAN Radio Unit
  • the main difference lies in whether LLS-U carries beamformed or non-beamformed PDSCH and PDSCH DMRS.
  • Example Al A network node 16 configured to communicate at least with a wireless device 22, WD 22, the network node 16 configured to, and/or comprising a radio interface 30 and/or comprising processing circuitry 36 configured to: determine a first balancing of at least one multiplexing group and/or a second balancing of at least one signaling port associated with the WD 22 based at least in part on the determined first balancing.
  • Example A2 The network node 16 of Example Al, wherein at least one of the network node 16, the radio interface 30, the processing circuitry 36 is further configured to at least one of: determine a least redundancy of the at least one multiplexing group and the at least one signaling port based on at least one of the determined first balancing and second balancing; and cause the network node 16 to transmit a signal based on at least one of the first balancing, the second balancing, and the least redundancy, the signal being transmitted to the WD 22 using the at least one signaling port.
  • Example A3 The network node of any one of Examples Al and A2, wherein at least one of: determining the first balancing includes at least one of: receiving a WD list including a plurality of spatial locations associated at least with the WD 22; determining whether the at least one multiplexing group is balanced; and determining a least occupied multiplexing group from the at least one multiplexing group; and determining the second balancing includes determining a least occupied signaling port from the at least one signaling port based at least in part on the determined least occupied multiplexing group.
  • Example A4 The network node 16 of any one of Examples A1-A3, wherein at least one of: the at least one multiplexing group is at least one code division multiplexing, CDM, group; and the least one signaling port is at least one DMRS port.
  • Example Bl A method implemented in a network node 16 configured to communicate at least with a wireless device, WD 22, the method comprising: determining a first balancing of at least one multiplexing group and/or a second balancing of at least one signaling port associated with the WD 22 based at least in part on the determined first balancing.
  • Example B2 The method of Example Bl, wherein the method further includes at least one of: determining a least redundancy of the at least one multiplexing group and the at least one signaling port based on at least one of the determined first balancing and second balancing; and transmitting a signal based on at least one of the first balancing, the second balancing, and the least redundancy, the signal being transmitted to the WD 22 using the at least one signaling port.
  • Example B3 The method of any one of Examples Bl and B2, wherein at least one of: determining the first balancing includes at least one of: receiving a WD list including a plurality of spatial locations associated at least with the WD 22; determining whether the at least one multiplexing group is balanced; and determining a least occupied multiplexing group from the at least one multiplexing group; and determining the second balancing includes determining a least occupied signaling port from the at least one signaling port based at least in part on the determined least occupied multiplexing group.
  • Example B4 The method of any one of Examples B 1-B3, wherein at least one of: the at least one multiplexing group is at least one code division multiplexing, CDM, group; and the least one signaling port is at least one DMRS port.
  • Example Cl. A wireless device, WD 22, configured to communicate with a network node 16, the WD 22 configured to, and/or comprising a radio interface and/or processing circuitry 50 configured to: determine a signal transmitted by the network node 16 using at least one signaling port, the signal being based on at least one of a first balancing of at least one multiplexing group, a second balancing of the at least one signaling port, and a least redundancy of the at least one multiplexing group and the at least one signaling port.
  • Example C2 The WD 22 of Example Cl, wherein at least one of: the first balancing is based on least one of: a WD list including a plurality of spatial locations associated at least with the WD 22; whether the at least one multiplexing group is balanced; and a least occupied multiplexing group from the at least one multiplexing group; and the second balancing is based on a least occupied signaling port of the at least one signaling port, the least occupied signaling port being based at least in part on the least occupied multiplexing group.
  • Example C3 The WD 22 of Example C2, wherein the processing circuitry 50 is further configured to: cause the WD 22 to transmit another signal including information associated a spatial location of the WD 22, the information being usable to determine the WD list.
  • Example C4. The WD 22 of any one of Examples C1-C3, wherein at least one of: the at least one multiplexing group is at least one code division multiplexing, CDM, group; and the least one signaling port is at least one DMRS port.
  • Example DI A method implemented in a wireless device, WD 22, configured to communicate with a network nodel6, the method comprising: determining a signal transmitted by the network node 16 using at least one signaling port, the signal being based on at least one of a first balancing of at least one multiplexing group, a second balancing of the at least one signaling port, and a least redundancy of the at least one multiplexing group and the at least one signaling port.
  • Example D2 The method of Example DI, wherein at least one of: the first balancing is based on least one of: a WD list including a plurality of spatial locations associated at least with the WD 22; whether the at least one multiplexing group is balanced; and a least occupied multiplexing group from the at least one multiplexing group; and the second balancing is based on a least occupied signaling port of the at least one signaling port, the least occupied signaling port being based at least in part on the least occupied multiplexing group.
  • Example D3 The method of Example D2, wherein the method further includes: transmitting another signal including information associated a spatial location of the WD 22, the information being usable to determine the WD list.
  • Example D4 The method of any one of Examples D1-D3, wherein at least one of: the at least one multiplexing group is at least one code division multiplexing, CDM, group; and the least one signaling port is at least one DMRS port.
  • the concepts described herein may be embodied as a method, data processing system, computer program product and/or computer storage media storing an executable computer program. Accordingly, the concepts described herein may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects all generally referred to herein as a “circuit” or “module.” Any process, step, action and/or functionality described herein may be performed by, and/or associated to, a corresponding module, which may be implemented in software and/or firmware and/or hardware. Furthermore, the disclosure may take the form of a computer program product on a tangible computer usable storage medium having computer program code embodied in the medium that can be executed by a computer. Any suitable tangible computer readable medium may be utilized including hard disks, CD-ROMs, electronic storage devices, optical storage devices, or magnetic storage devices.
  • These computer program instructions may also be stored in a computer readable memory or storage medium that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instruction means which implement the function/act specified in the flowchart and/or block diagram block or blocks.
  • the computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks.
  • Computer program code for carrying out operations of the concepts described herein may be written in an object oriented programming language such as Python, Java® or C++.
  • the computer program code for carrying out operations of the disclosure may also be written in conventional procedural programming languages, such as the "C" programming language.
  • the program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer.
  • the remote computer may be connected to the user's computer through a local area network (LAN) or a wide area network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet Service Provider).
  • LAN local area network
  • WAN wide area network
  • Internet Service Provider for example, AT&T, MCI, Sprint, EarthLink, MSN, GTE, etc.
  • O-DU O-RAN Distributed Unit
  • O-RU O-RAN Radio Unit ORAN Open RAN

Landscapes

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

Abstract

Un procédé, un système et un appareil sont divulgués. Dans certains modes de réalisation, un nœud de réseau en communication avec une pluralité de dispositifs sans fil MU-MIMO est décrit. Le nœud de réseau est configuré pour déterminer une occupation d'une pluralité de groupes de multiplexage par répartition en code (CDM) associés à la pluralité de dispositifs sans fil MU-MIMO, sélectionner un premier groupe CDM de la pluralité de groupes CDM sur la base du fait que le premier groupe CDM est un groupe CDM le moins occupé de la pluralité de groupes CDM, déterminer une occupation de ports DMRS pour le premier groupe CDM, et attribuer au moins un port DMRS associé au premier groupe CDM à un premier dispositif sans fil MU-MIMO de la pluralité de dispositifs sans fil MU-MIMO sur la base de l'occupation de ports DMRS pour le premier groupe CDM où le premier dispositif sans fil MU-MIMO a un rang égal à 1 ou 2.
PCT/IB2023/050740 2022-01-28 2023-01-27 Attribution dynamique de ports de signal de référence de démodulation (dmrs) pour entrée multiple sortie multiple multi-utilisateur (mu-mimo) en liaison descendante (dl) WO2023144776A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US202263304115P 2022-01-28 2022-01-28
US63/304,115 2022-01-28

Publications (1)

Publication Number Publication Date
WO2023144776A1 true WO2023144776A1 (fr) 2023-08-03

Family

ID=85172927

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2023/050740 WO2023144776A1 (fr) 2022-01-28 2023-01-27 Attribution dynamique de ports de signal de référence de démodulation (dmrs) pour entrée multiple sortie multiple multi-utilisateur (mu-mimo) en liaison descendante (dl)

Country Status (1)

Country Link
WO (1) WO2023144776A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019039917A1 (fr) * 2017-08-24 2019-02-28 Samsung Electronics Co., Ltd. Procédé et appareil de regroupement de ports dmrs destinés à être utilisés dans un système de communication cellulaire sans fil
WO2020118686A1 (fr) * 2018-12-14 2020-06-18 Nec Corporation Configuration de dmrs

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019039917A1 (fr) * 2017-08-24 2019-02-28 Samsung Electronics Co., Ltd. Procédé et appareil de regroupement de ports dmrs destinés à être utilisés dans un système de communication cellulaire sans fil
WO2020118686A1 (fr) * 2018-12-14 2020-06-18 Nec Corporation Configuration de dmrs

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
3GPP TECHNICAL SPECIFICATION (TS) 38.212

Similar Documents

Publication Publication Date Title
US20210234580A1 (en) Adaptive downlink multi user multiple input multiple output (mu-mimo)precoding using uplink signal subspace tracking for active antenna systems aas
WO2019141285A1 (fr) Procédé, dispositif, et système d'indication de sélection d'antenne
JP2023017799A (ja) 効率的なｓｒｓリソース指示方法
WO2019062681A1 (fr) Procédé de transmission et de configuration de liaison montante, terminal et station de base
CN112042147B (zh) 具有多个假设的信道状态信息(csi)反馈
CN111656713B (zh) 用于非预编码器矩阵指示符(pmi)信道状态信息(csi)反馈的端口索引信令的方法和设备
US20240007164A1 (en) Methods for reducing overhead of nr type ii channel state information feedback using angle and delay reciprocity
EP3857785A1 (fr) Restriction de configurations de commande de puissance du signal de référence de sondage (srs)
CN115053469A (zh) 关于多个发送/接收点的信道状态信息的增强
WO2022027625A1 (fr) Précodage dans le domaine fréquentiel pour réciprocité fdd
US20220295297A1 (en) Methods and apparatuses for time-domain beam-sweeping
EP4049381A1 (fr) Compensation d'erreur de phase destinée à des systèmes de liaison descendante avec quatre antennes corrélées et non étalonnées
WO2023039713A1 (fr) Systèmes, procédés et supports non transitoires lisibles par un processeur pour déterminer des informations de précodage pour des transmissions en liaison montante
WO2023144776A1 (fr) Attribution dynamique de ports de signal de référence de démodulation (dmrs) pour entrée multiple sortie multiple multi-utilisateur (mu-mimo) en liaison descendante (dl)
KR20240026440A (ko) 업링크 주파수 선택적 프리코딩을 위한 시스템 및 방법
WO2021053370A1 (fr) Transmission mu-mimo assistée à distance d'un pmi (pmid)
US11190245B2 (en) Port to antenna mapping design in virtualized active antenna system (AAS)
US20230119746A1 (en) Codebook based zero-forced mu-mimo beamforming
CN112534734B (zh) 用于无线通信的使用共相矩阵进行波束成形的适应性共相
US20240014872A1 (en) Dual codebook configuration and csi combining for large scale active antenna systems
WO2024016227A1 (fr) Techniques de transmission en liaison montante
WO2023144773A1 (fr) Établissement de relation spatiale d'équipement utilisateur (eu) assisté par indicateur de matrice de précodage (pmi)
US20220278794A1 (en) Reference signals ports extension for large antenna arrays
WO2024033676A1 (fr) Entrée multiple et sortie multiple multi-utilisateurs (mu-mimo) améliorées à l'aide d'une co-planification et d'une commutation à accès multiple orthogonal, non orthogonal (oma-noma) dynamique
WO2024079319A1 (fr) Restriction de rang pour une transmission ul à panneaux multiples

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 23703347

Country of ref document: EP

Kind code of ref document: A1