WO2024065413A1 - Groupage de signaux de référence de démodulation (dmrs) dans des réseaux non terrestres (ntn) - Google Patents

Groupage de signaux de référence de démodulation (dmrs) dans des réseaux non terrestres (ntn) Download PDF

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Publication number
WO2024065413A1
WO2024065413A1 PCT/CN2022/122678 CN2022122678W WO2024065413A1 WO 2024065413 A1 WO2024065413 A1 WO 2024065413A1 CN 2022122678 W CN2022122678 W CN 2022122678W WO 2024065413 A1 WO2024065413 A1 WO 2024065413A1
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WO
WIPO (PCT)
Prior art keywords
tdw
size
pusch
dmrs bundling
wireless communication
Prior art date
Application number
PCT/CN2022/122678
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English (en)
Inventor
Haitong Sun
Chunxuan Ye
Dawei Zhang
Wei Zeng
Hong He
Chunhai Yao
Jie Cui
Idan Bar-Sade
Ajay Panchal
Ankit Bhamri
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Apple Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Apple Inc. filed Critical Apple Inc.
Priority to PCT/CN2022/122678 priority Critical patent/WO2024065413A1/fr
Publication of WO2024065413A1 publication Critical patent/WO2024065413A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay
    • H04B7/18513—Transmission in a satellite or space-based system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/115—Grant-free or autonomous transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H04W72/1268—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of uplink data flows

Definitions

  • Various aspects generally may relate to the field of wireless communications.
  • aspects of the approach described herein include a method by a user equipment (UE) for providing a dynamic indication of demodulation reference signal (DMRS) bundling size in a wireless communication network having a satellite.
  • the method includes receiving, from the wireless communication network, a maximum allowed timing advance (TA) variation for DMRS bundling, and also includes reporting, to the wireless communication network, a time domain window (TDW) duration capability.
  • the method further includes receiving, from the wireless communication network, a configured grant for a Physical Uplink Shared Channel (PUSCH) , the configured grant indicating the DMRS bundling size, as well as determining an actual TDW size for PUSCH DMRS bundling based on an estimated TA variation compared with the maximum allowed TA variation.
  • the method also includes reporting, to the wireless communication network, the actual TDW size for PUSCH DMRS bundling using the PUSCH channel.
  • PUSCH Physical Uplink Shared Channel
  • aspects of the approach described herein also include a method by a wireless communications network for providing a dynamic indication of demodulation reference signal (DMRS) bundling size to a user equipment (UE) , the wireless communication network having a satellite.
  • the method includes determining, by the wireless communication network, a maximum allowed timing advance (TA) variation for DMRS bundling, and also receiving, by the wireless communication network, a time domain window (TDW) duration capability from the UE.
  • TA timing advance
  • TDW time domain window
  • the method further includes scheduling, by the wireless communication network, a configured grant for a PUSCH channel for the UE, the configured grant indicating the DMRS bundling size, and the DMRS bundling size is based on the TDW duration capability of the UE, as well as receiving, from the UE, an actual TDW size for PUSCH DMRS bundling.
  • the method also includes performing joint channel estimation based on the actual TDW size for PUSCH DMRS bundling.
  • a user equipment that includes a radio frequency (RF) transceiver having an antenna, and processing circuitry coupled to the RF transceiver.
  • the RF transceiver is configured to receive, from the wireless communication network, a maximum allowed timing advance (TA) variation for DMRS bundling, and to transmit, to the wireless communication network, a time domain window (TDW) duration capability.
  • the RF transceiver is further configured to receive, from the wireless communication network, a configured grant for a PUSCH channel, the configured grant indicating the DMRS bundling size.
  • the processing circuitry is configured to determine an actual TDW size for PUSCH DMRS bundling based on an estimated TA variation compared with the maximum allowed TA variation.
  • the RF transceiver is further configured to report, via the antenna, to the wireless communication network, the actual TDW size for PUSCH DMRS bundling using the PUSCH channel.
  • aspects of the approach include a method by a user equipment (UE) for providing a semi-static indication of demodulation reference signal (DMRS) bundling size in a wireless communication network having a satellite.
  • the method includes receiving, from the wireless communication network, an uplink segmented transmission duration for DMRS bundling, as well as reporting, to the wireless communication network, a time domain window (TDW) duration capability.
  • the method further includes receiving, from the wireless communication network, a configured grant for a PUSCH channel, the configured grant indicating the DMRS bundling size.
  • the method also includes transmits on the configured grant on the PUSCH channel, using the indicated PUSCH DMRS bundling.
  • aspects of the present approach include a method by a wireless communications network for providing a semi-static indication of demodulation reference signal (DMRS) bundling size to a user equipment (UE) , the wireless communication network having a satellite.
  • the method includes indicating, by the wireless communication network, an uplink segmented transmission duration, as well as receiving, by the wireless communication network, a time domain window (TDW) duration capability from the UE.
  • the method further includes scheduling, by the wireless communication network, a configured grant for a PUSCH channel for the UE, the configured grant indicating the DMRS bundling size, wherein the DMRS bundling size is based on the TDW duration capability of the UE and based on the uplink segmented transmission duration.
  • the method also includes performing joint channel estimation based on the actual TDW size for PUSCH DMRS bundling.
  • a user equipment that includes a radio frequency (RF) transceiver having an antenna, as well as processing circuitry coupled to the RF transceiver.
  • the RF transceiver is configured to receive, from the wireless communication network, an uplink segmented transmission duration for DMRS bundling, and to also transmit, to the wireless communication network, a time domain window (TDW) duration capability.
  • the RF transceiver is also configured to receive, from the wireless communication network, a configured grant for a PUSCH channel, the configured grant indicating the DMRS bundling size.
  • the processing circuitry is configured to cause to transmit on the configured grant on the PUSCH channel, using the indicated PUSCH DMRS bundling.
  • FIG. 1 illustrates an example system implementing DMRS bundling between a user equipment (UE) and satellites in a wireless communication network, according to some aspects of the disclosure.
  • UE user equipment
  • FIG. 2 illustrates a block diagram of an example system of an electronic device implementing mechanisms for DMRS bundling for communication with satellites, according to some aspects of the disclosure.
  • FIG. 3 illustrates joint channel estimation using DMRS bundling illustrating an exemplary time domain window (TDW) of slots, in accordance with aspects of the present disclosure.
  • TDW time domain window
  • FIG. 4A illustrates TDW counting based on physical slots, in accordance with aspects of the present disclosure.
  • FIG. 4B illustrates a consecutive slot sequence 430, in accordance with aspects of the present disclosure.
  • FIG. 5A and FIG. 5B illustrate the implementation of dynamic indication of DMRS bundling size, in accordance with aspects of the present disclosure.
  • FIG. 6A and FIG. 6B illustrate indications of the actual TDW size, in accordance with aspects of the present disclosure.
  • FIG. 7A and FIG. 7B illustrate the semi-static indication of DMRS bundling size, in accordance with aspects of the present disclosure.
  • FIG. 8 illustrates timing advances in the context, in accordance with aspects of the present disclosure.
  • FIG. 9 is an example computer system for implementing some aspects or portion (s) thereof.
  • FIG. 1 illustrates an example system implementing mechanisms for DMRS bundling between a user equipment (UE) and non-terrestrial networks, according to some aspects of the disclosure.
  • Example system 100 is provided for the purpose of illustration only and does not limit the disclosed aspects.
  • System 100 may include, but is not limited to, network nodes (base stations that are for example, satellites) 101 and 103 and electronic device (for example, a UE) 105.
  • Electronic device 105 (hereinafter referred to as UE 105) can include an electronic device configured to operate based on a wide variety of wireless communication techniques. These techniques can include, but are not limited to, techniques based on 3rd Generation Partnership Project (3GPP) standards.
  • 3GPP 3rd Generation Partnership Project
  • UE 105 can be configured to operate using the 3GPP standards.
  • UE 105 can include, but is not limited to, as wireless communication devices, smart phones, laptops, desktops, tablets, personal assistants, monitors, televisions, wearable devices, Internet of Things (IoTs) , vehicle’s communication devices, and the like.
  • Network node 101 (herein referred to as a base station) can include nodes configured to operate based on a wide variety of wireless communication techniques such as, but not limited to, techniques based on 3GPP standards.
  • UE 105 and satellites 101 and 103 are configured for radio link monitoring.
  • UE 105 can be connected to and can be communicating with satellite 101 (e.g., the serving cell) using carrier 107 from which UE 105 receives the multiple downlink signals.
  • satellite 101 e.g., the serving cell
  • UE 105 can measure one or more carriers (e.g., carrier 107) used for communication with satellite 101 (e.g., the serving cell) to perform radio link monitoring.
  • UE 105 can measure one or more carriers (e.g., carrier 109) used for communication with satellite 103 (e.g., a neighboring cell) to perform radio link monitoring.
  • UE 105 can measure one or more carriers (e.g., carrier 111) used for communication with terrestrial base station 113 (e.g., nearby terrestrial cell) to perform radio link monitoring.
  • FIG. 2 illustrates a block diagram of an example system 200 of an electronic device implementing mechanisms for DMRS bundling for communication, according to some aspects of the disclosure.
  • System 200 may be any of the electronic devices (e.g., satellites 101, 103, UE 105) of system 100.
  • System 200 includes processor 210, one or more transceivers 220a-220n, communication infrastructure 240, memory 250, operating system 252, application 254, and antenna 260.
  • Illustrated systems are provided as exemplary parts of system 200, and system 200 can include other circuit (s) and subsystem (s) .
  • the systems of system 200 are illustrated as separate components, the aspects of this disclosure can include any combination of these, less, or more components.
  • Memory 250 may include random access memory (RAM) and/or cache, and may include control logic (e.g., computer software) and/or data. Memory 250 may include other storage devices or memory such as, but not limited to, a hard disk drive and/or a removable storage device/unit. According to some examples, operating system 252 can be stored in memory 250. Operating system 252 can manage transfer of data from memory 250 and/or one or more applications 254 to processor 210 and/or one or more transceivers 220a-220n. In some examples, operating system 252 maintains one or more network protocol stacks (e.g., Internet protocol stack, cellular protocol stack, and the like) that can include a number of logical layers. At corresponding layers of the protocol stack, operating system 252 includes control mechanism and data structures to perform the functions associated with that layer.
  • network protocol stacks e.g., Internet protocol stack, cellular protocol stack, and the like
  • application 254 can be stored in memory 250.
  • Application 254 can include applications (e.g., user applications) used by wireless system 200 and/or a user of wireless system 200.
  • the applications in application 254 can include applications such as, but not limited to radio streaming, video streaming, remote control, and/or other user applications.
  • System 200 can also include communication infrastructure 240.
  • Communication infrastructure 240 provides communication between, for example, processor 210, one or more transceivers 220a-220n, and memory 250.
  • communication infrastructure 240 may be a bus.
  • Processor 210 together with instructions stored in memory 250 performs operations enabling system 200 of system 100 to implement mechanisms for radio link monitoring, as described herein.
  • One or more transceivers 220a-220n transmit and receive communications signals that support mechanisms for performing time and/or frequency tracking based on those TRS configurations, according to some aspects, and may be coupled to antenna 260.
  • Antenna 260 may include one or more antennas that may be the same or different types.
  • One or more transceivers 220a-220n allow system 200 to communicate with other devices that may be wired and/or wireless.
  • one or more transceivers 220a-220n can include processors, controllers, radios, sockets, plugs, buffers, and like circuits/devices used for connecting to and communication on networks.
  • one or more transceivers 220a-220n include one or more circuits to connect to and communicate on wired and/or wireless networks.
  • one or more transceivers 220a-220n can include a satellite subsystem, cellular subsystem, a WLAN subsystem, and/or a Bluetooth TM subsystem, each including its own radio transceiver and protocol (s) as will be understood by those skilled arts based on the discussion provided herein.
  • one or more transceivers 220a-220n can include more or fewer systems for communicating with other devices.
  • the term “satellite” used here include different types of satellites, such as GEO (geostationary earth orbit) satellites and LEO (low earth orbit) satellites.
  • one or more transceivers 220a-220n can include one or more circuits (including a WLAN transceiver) to enable connection (s) and communication over WLAN networks such as, but not limited to, networks based on standards described in IEEE 802.11. Additionally, or alternatively, one or more transceivers 220a-220n can include one or more circuits (including a Bluetooth TM transceiver) to enable connection (s) and communication based on, for example, Bluetooth TM protocol, the Bluetooth TM Low Energy protocol, or the Bluetooth TM Low Energy Long Range protocol. For example, transceiver 220n can include a Bluetooth TM transceiver.
  • one or more transceivers 220a-220n can include one or more circuits (including a cellular transceiver) for connecting to and communicating on cellular networks.
  • the cellular networks can include, but are not limited to, 3G/4G/5G networks such as Universal Mobile Telecommunications System (UMTS) , Long-Term Evolution (LTE) , and the like.
  • UMTS Universal Mobile Telecommunications System
  • LTE Long-Term Evolution
  • one or more transceivers 220a-220n can be configured to operate according to one or more of Rel-15, Rel-16, Rel-17, or other of the 3GPP standard.
  • one or more transceivers 220a-220n can include one or more circuits for connecting to and communicating with satellite networks.
  • satellite networks can include, but are not limited to, wireless communication networks such as 3G/4G/5G networks such as Universal Mobile Telecommunications System (UMTS) , Long-Term Evolution (LTE) , as well as specific satellite communications network protocols for gateway functionality and control functionality from satellite ground stations.
  • UMTS Universal Mobile Telecommunications System
  • LTE Long-Term Evolution
  • one or more transceivers 220a-220n can be configured to operate according to one or more of Rel-15, Rel-16, Rel-17, or other of the 3GPP standard.
  • additional capability is provided to steer beams towards fixed points on the Earth’s surface by either beamforming or by a mechanically steerable beam approach.
  • processor 210 alone or in combination with computer instructions stored within memory 250, and/or one or more transceiver 220a-220n, implements radio link monitoring, as discussed herein.
  • transceiver 220a can enable connection (s) and communication over a first carrier (for example, carrier 107 of FIG. 1) .
  • transceiver 220a and/or transceiver 220b can enable reception of signaling of TRS configuration information (for example, carrier 109 of FIG. 1) .
  • wireless system 200 can include one transceiver configured to operate at different carriers.
  • Processor 210 can be configured to control the one transceiver to switch between different carriers, according to some examples.
  • processor 210 alone or in combination with computer instructions stored within memory 250, and/or one or more transceiver 220a-220n, can implement these operations.
  • DMRS Demodulation Reference Signals
  • satellite networks may be used to supplement terrestrial networks (such as LTE and NR networks) and thereby provide connectivity to remote areas and those areas lacking high data rate services.
  • These services and connectivity include backhaul, transportation, outdoor service, and IoT.
  • DRMS demodulation reference signals
  • Various use cases for joint channel estimation may be considered, including the following: (a) back-to-back PUSCH within one slot (PUSCH repetition type B) , (b) Back-to-back PUSCH across consecutive slots (PUSCH repetition type A/B, transport block over multi-slot (TBoMS) ) , and (c) non-back-to-back PUSCH across consecutive slots (PUSCH repetition type A/B, TBoMS) , when no other UL transmission in the middle of PUSCH/PUCCH transmissions.
  • the UE is expected to maintain power consistency and phase continuity within the TDW; (b) the maximum duration is set by the UE capability; and (c) for a configured time domain window, the maximum value of window length L of the configured TDW (if configured) should not exceed the maximum duration. If L is not configured, the default value of L is the minimum of the following: the maximum duration, and the set of the duration of all PUSCH repetitions.
  • FIG. 3 illustrates joint channel estimation using DMRS bundling illustrating an exemplary time domain window (TDW) of slots, in accordance with aspects of the present disclosure.
  • TDW time domain window
  • Four consecutive slots are illustrated, namely slot 0 (310) , slot 1 (320) , slot 2 (330) and slot 3 (340) .
  • DRMS signals are transmitted in symbols 2, 5, 8 and 11.
  • the DRMS signals from slot 0 (310) and slot 1 (320) are provided to joint channel estimator 350, while DRMS signals from slot 2 (330) and slot 3 (340) are provided to joint channel estimator 360.
  • one or multiple actual TDWs may be implicitly determined. It is noted that if power consistency and phase continuity are violated due to a particular event, the creation of a new actual TDW is subject to the capability of the UE to support the restarting of DMRS bundling.
  • Such events that violate the requirements of power consistency and phase continuity include the following: (a) dropping and/or cancellation based on collision rules set forth in the 3GPP specifications; (b) DL slot or DL reception/monitoring based on semi-static DL/UL configuration for unpaired spectrum; (c) the gap between two PUSCH/PUCCH transmissions exceeds thirteen (13) symbols; (d) for non-back-to-back PUSCH/PUCCH across consecutive slots, the other uplink transmission in in the middle of two PUSCH/PUCCH transmissions; (e) the action of transmit power control (TPC) commands; and (f) UL beam switching for multi-TRP operation, if DMRS bundling and UL beam switching are configured simultaneously.
  • TPC transmit power control
  • TDW for counting may be based on physical slots or be based on available slots by configuration.
  • FIG. 4A illustrates TDW counting based on physical slots, in accordance with aspects of the present disclosure.
  • FIG. 4A illustrates the consecutive slot sequence 410 having a consecutive repetition of 12 slots 420) .
  • the individual slots are denoted by how each of the symbols within each slot are used.
  • the label “U” indicates that the symbols are used for uplink
  • the label “D” indicates that the symbols are used for downlink within that specific slot
  • the label “S” indicates that the symbols may be used as uplink or downlink.
  • there are two time domain windows, TDW1 and TDW2 within slots 420 each of which encompasses six slots.
  • the sequence of slot utilization results in three actual time domain windows (ATDWs) .
  • the three ATDWs are slot 0, slots 2–5, and 8–10. This is the result of the switching from uplink to downlink utilization, which terminates an ATDW.
  • FIG. 4B illustrates consecutive slot sequence 430 (same sequence as slot sequence 410 from FIG. 4A) , in accordance with aspects of the present disclosure.
  • the available slot repetition is 12, which is the number of slots with symbols available for uplink transmission.
  • TDW1, TDW2 and TDW3 there are three time domain windows, TDW1, TDW2 and TDW3.
  • the actual time domain windows (ATDWs) are shown, with each of the first three ATDWs terminating upon reaching a slot being used for downlink purposes.
  • the final ATDW terminates based on the end of TDW2.
  • the UE should not perform time advance (TA) adjustment during a TDW. If the UE is configured to accumulate TPC commands, then the TPC command takes effect after the current configured TDW. If the UE is not configured to accumulate TPC commands, then the last TPC command takes effect in a configured TDW and supersedes all previous TPC commands taking effect with that configured TDW. In other words, only the last TPC command is applied by UE after the current configured TDW.
  • TA time advance
  • the technical challenge is how to enhance the DMRS bundling of PUSCH or PUCCH in a non-terrestrial network.
  • the timing advance (TA) needs to be fixed in DMRS bundling of PUSCH or PUCCH.
  • the location of the satellites changes very quickly. Because of this, the TA needs to keep changing.
  • Two solutions are described to meet the challenge described above: (a) a dynamic indication of DMRS bundling size, and (b) a semi-static indication of DMRS bundling size.
  • DMRS Demodulation Reference Signals
  • the network indicates the maximum allowed TA variation (TA thres ) for DMRS bundling. It is noted that the network assumes that the TA is not changed for several consecutive slots for the purpose of joint channel estimation. However, as noted above, in the non-terrestrial network scenario, the actual TA keeps changing due to the rapid motion of the satellites. If TA is larger than the required timing error (Te) , then the uplink synchronization is broken. The network determines TA thres for uplink synchronization purposes. The units for TA thres may be expressed in a number of slots or expressed in absolute time (e.g. milliseconds) . TA thres may be smaller than Te (required timing error) .
  • Te required timing error
  • the network signals an indication of the value of TA thres .
  • the indication may be made via either system information block 1 (SIB1) , SIB19 or a new NTN-specific SIB.
  • SIB1 system information block 1
  • SIB19 SIB19
  • RRC dedicated radio resource control
  • the indication may be provided via a medium access control (MAC) control element (CE) .
  • the indication may be provided via a downlink control information (DCI) signal.
  • DI downlink control information
  • FIG. 5A and FIG. 5B illustrate the first solution, i.e., the dynamic indication of DMRS bundling size, in accordance with aspects of the present disclosure, where FIG. 5A illustrates the solution from the network side, while FIG. 5B illustrates the solution from the UE side.
  • the network determines the maximum allowed TA variation for DMRS bundling. This maximum allowed TA variation may depend on elevation angle of the serving beam from the satellite. This maximum allowed TA variation may depend on the speed of the satellite motion, which is related to satellite orbit.
  • step 2 the network receives a UE capability report on the time domain window (TDW) duration.
  • TDW time domain window
  • step 3 the network schedules configured grant PUSCH for the UE, which indicates the DMRS bundling (TDW) size, based on the capability reported by the UE. For example, a UE reports its capability of a maximum duration for DMRS bundling, which implies the maximum number of slots the UE can keep power consistency and phase continuity.
  • the DMRS bundling (TDW) size in the network scheduled grant PUSCH should not exceed the UE reported maximum duration for DMRS bundling.
  • step 4 the network receives the UE-indicated actual TDW size for PUSCH DMRS bundling.
  • step 5 the network performs joint channel estimation based on the UE-indicated TDW for PUSCH DMRS bundling.
  • step 1 the UE receives the maximum allowed TA variation for DMRS bundling.
  • step 2 the UE reports its capability report on the time domain window (TDW) duration.
  • step 3 the UE receives a configured grant PUSCH, which indicates the DMRS bundling (TDW) size.
  • step 4 the UE determines the actual TDW size for PUSCH DMRS bundling, based on its estimated TA variation compared with the maximum allowed TA variation. In general, the UE calculates/estimates the TA value of each slot for PUSCH repetitions.
  • step 5 the UE reports its actual TDW size for PUSCH DMRS bundling, and transmits using the PUSCH its indicated DMRS bundling size.
  • the network receives from the UE, the UE-indicated actual TDW size for PUSCH DMRS bundling.
  • the actual TDW size for PUSCH DMRS bundling may be expressed in units of number of slots or may be expressed in absolute time (e.g., milliseconds) .
  • the signaling of the UE indication of actual TDW size may be accomplished using a number of various alternatives.
  • this indication may be provided via an uplink control information (UCI) signal associated with configured grant PUSCH.
  • the indication may be provided via a UCI before configured grant.
  • the indication may be provided using a MAC CE before configured grant.
  • the indication may be provided by a dedicated RRC message before configured grant.
  • the UE determines the actual TDW size for PUSCH DMRS bundling based on its estimated TA variation compared with the maximum allowed TA variation.
  • N TA, offset is a fixed offset used to calculate the timing advance.
  • the UE determines the TA value for each slot in consecutive slots for PUSCH transmissions. The TA calculation is based on both open loop and closed loop TA control. The UE compares the TA value with the maximal allowed TA variation indicated by network. The UE determines the maximum number of slots with TA variation being within the maximal allowed TA variation.
  • the UE reports its actual TDW size for PUSCH DMRS bundling, and transmits the PUSCH signal with its indicated DMRS bundling size.
  • the DMRS bundling can continue after the segmented uplink slots. Two options are possible for this first alternative. The first option is that the next actual TDW size (s) for the following PUSCH DMRS bundling may be additionally indicated. In a second option, the same actual TDW size is applied for the following PUSCH DMRS bundling.
  • the 6A illustrates this alternative, whereby the difference of TA i-1 and TA 0 is less than the TA thres (the threshold value) , while the difference of TA i and TA 0 is more than the TA thres . Accordingly, the actual TDW size is equal to i.
  • DMRS bundling is stopped after the segmented uplink slots. As such, all the following slots in PUSCH does not apply DMRS bundling.
  • the UE stops the PUSCH transmission after the actual TDW size. In this alternative, the UE does not report its actual TDW size, since it implicitly indicates the actual TDW size.
  • FIG. 6B illustrates this alternative, whereby the difference of TA i-1 and TA 0 is less than the TA thres (the threshold value) , while the difference of TA i and TA 0 is more than the TA thres . Accordingly, the actual TDW size is equal to i.
  • an additional gap may be added between the two actual TDW transmissions to address the TA adjustment.
  • the units of this additional gap may be in samples, symbols or slots.
  • the gap may also be counted as a part of the later slot, i.e., the later slot will be impacted by the size of the gap.
  • DMRS Demodulation Reference Signals
  • aspects of this approach to the joint channel estimation for PUSCH in non-terrestrial networks is as follows. The same applies to both PUSCH and PUCCH, and descriptions are provided for both the network side and the UE side.
  • FIG. 7A and FIG. 7B illustrate the second solution, i.e., the semi-static indication of DMRS bundling size, in accordance with aspects of the disclosure, where FIG. 7A illustrates the solution from the network side, while FIG. 7B illustrates the solution from the UE side.
  • the network indicates the uplink segmented transmission duration.
  • the network receives a UE capability report on the maximum time domain window (TDW) duration.
  • the network schedules configured grant PUSCH for the UE, which indicates the DMRS bundling (TDW) size, based on the capability reported by the UE and the uplink segmented transmission duration.
  • step 4 (720) the network performs joint channel estimation based on the UE-indicated TDW for PUSCH DMRS bundling.
  • step 1 the UE receives the uplink segment duration for DMRS bundling.
  • step 2 the UE reports its capability report on the maximum time domain window (TDW) duration.
  • step 3 the UE receives a configured grant PUSCH, which indicates the DMRS bundling size.
  • step 4 the UE transmits on the configured grant PUSCH, based on the indicated PUSCH DMRS bundling size.
  • the network indicates the uplink segmented transmission duration.
  • the uplink segmented transmission duration may depend on elevation angle between the satellite and the UE. For a large elevation angle, the uplink segmented transmission is smaller since the TA variation is smaller. For a small elevation angle, the uplink segmented transmission is larger since the TA variation is larger. It is possible that multiple uplink segmented transmission durations are indicated, whereby the use of which duration depends on the elevation angle of the UE. The elevation angle may be informed by the UE to the network.
  • the uplink segmented transmission duration may depend on K offset value, whereby the K offset value is an offset value known to both network and UE. This value is used to determine the uplink transmission slot. It is generally larger than the TA (timing advance) so that the uplink transmission scheduling is causal.
  • the K offset value may be either a cell-specific K offset or a UE-specific K offset value. For a larger K offset value, the uplink segmented transmission duration is larger. For a smaller K offset value, the uplink segmented transmission duration is smaller. It is possible that multiple uplink segmented transmission durations are indicated, whereby the use of which duration depends on the K offset value.
  • the signaling of the uplink segmented transmission duration may be undertaken with one or more of the following alternatives.
  • the indication may be made via either system information block 1 (SIB1) , SIB19 or a new NTN-specific SIB.
  • the indication may be provided through a dedicated radio resource control (RRC) message.
  • RRC radio resource control
  • the indication may be provided via a medium access control (MAC) control element (CE) .
  • the indication may be provided via a downlink control information (DCI) signal.
  • SIB1 system information block 1
  • RRC radio resource control
  • MAC medium access control
  • CE control element
  • DCI downlink control information
  • the signaling of the uplink segmented transmission duration may be part of the configuration for PUSCH DMRS bundling (i.e., it may be signaled as part of DMRS-BundlingPUSCH-Config) or it may be independently configured from USCH DMRS bundling.
  • the unit of uplink segmented transmission duration may be slots.
  • step 1 and step 2 may be swapped.
  • the base station e.g., gNB
  • step 3 (715) the network schedules a configured grant PUSCH for UE, which indicates the DMRS bundling size.
  • This size is based on UE capability and uplink segmented transmission duration.
  • This approach may be extended to a dynamic grant PUSCH as well, with at least two options. In a first option, the minimum value of the UE-reported DMRS bundling size and the uplink segmented transmission duration are taken as the dedicated DMRS bundling size value for the UE. In a second option, if the TDW is configured, the TDW size is additionally upper-bounded by the uplink segmented transmission duration.
  • the TDW size is equal to a minimum value of: (a) the UE-reported maximum duration of the DMRS bundling size; (b) the PUSCH repetition size; (c) the frequency hopping interval for PUSCH repetitions; and (d) the uplink segmented transmission duration.
  • a new information element IE
  • “DMRS-BundlingPUSCH-Config_NTN” is designed, which has a different time domain window length from the legacy IE “DMRS-BundlingPUSCH-Config-r17.
  • a new element of “pusch-TimeDomainWindowLength-NTN” is added to the existing IE of “DMRS-BundlingPUSCH-Config-r17” whose value is not larger than the UE-reported DMRS bundling size and uplink segmented transmission duration.
  • the segment is equal to or smaller than the UE-reported maximum duration.
  • the size of the segment is the same as the TDW.
  • the TA command is applied to the first transmission of a segment, and keeps the same TA within the slot of segment. The new TA is applied to the next segment.
  • FIG. 8 illustrates timing advances in the context, in accordance with aspects of the present disclosure.
  • Segment 1 uses timing advice TA 0
  • segment 2 uses timing advice TA 1 .
  • Computer system 900 can be any well-known computer capable of performing the functions described herein such as devices 101, 103, 105 of FIG. 1, or 200 of FIG. 2.
  • Computer system 900 includes one or more processors (also called central processing units, or CPUs) , such as a processor 904.
  • Processor 904 is connected to a communication infrastructure 906 (e.g., a bus. )
  • Computer system 900 also includes user input/output device (s) 903, such as monitors, keyboards, pointing devices, etc., that communicate with communication infrastructure 906 through user input/output interface (s) 902.
  • Computer system 900 also includes a main or primary memory 908, such as random access memory (RAM) .
  • Main memory 908 may include one or more levels of cache.
  • Main memory 908 has stored therein control logic (e.g., computer software) and/or data.
  • Computer system 900 may also include one or more secondary storage devices or memory 910.
  • Secondary memory 910 may include, for example, a hard disk drive 912 and/or a removable storage device or drive 914.
  • Removable storage drive 914 may be a floppy disk drive, a magnetic tape drive, a compact disk drive, an optical storage device, tape backup device, and/or any other storage device/drive.
  • Removable storage drive 914 may interact with a removable storage unit 918.
  • Removable storage unit 918 includes a computer usable or readable storage device having stored thereon computer software (control logic) and/or data.
  • Removable storage unit 918 may be a floppy disk, magnetic tape, compact disk, DVD, optical storage disk, and/any other computer data storage device.
  • Removable storage drive 914 reads from and/or writes to removable storage unit 918 in a well-known manner.
  • secondary memory 910 may include other means, instrumentalities or other approaches for allowing computer programs and/or other instructions and/or data to be accessed by computer system 900.
  • Such means, instrumentalities or other approaches may include, for example, a removable storage unit 922 and an interface 920.
  • the removable storage unit 922 and the interface 920 may include a program cartridge and cartridge interface (such as that found in video game devices) , a removable memory chip (such as an EPROM or PROM) and associated socket, a memory stick and USB port, a memory card and associated memory card slot, and/or any other removable storage unit and associated interface.
  • Computer system 900 may further include communication or network interface 924.
  • Communication interface 924 enables computer system 900 to communicate and interact with any combination of remote devices, remote networks, remote entities, etc. (individually and collectively referenced by reference number 928) .
  • communication interface 924 may allow computer system 900 to communicate with remote devices 928 over communications path 926, which may be wired and/or wireless, and may include any combination of LANs, WANs, the Internet, etc. Control logic and/or data may be transmitted to and from computer system 900 via communication path 926.
  • a tangible, non-transitory apparatus or article of manufacture includes a tangible, non-transitory computer useable or readable medium having control logic (software) stored thereon is also referred to herein as a computer program product or program storage device.
  • control logic software stored thereon
  • control logic when executed by one or more data processing devices (such as computer system 900) , causes such data processing devices to operate as described herein.
  • aspects of the present technology may include the gathering and use of data available from various sources, e.g., to improve or enhance functionality.
  • this gathered data may include personal information data that uniquely identifies or can be used to contact or locate a specific person.
  • personal information data can include demographic data, location-based data, telephone numbers, email addresses, Twitter ID’s , home addresses, data or records relating to a user’s health or level of fitness (e.g., vital signs measurements, medication information, exercise information) , date of birth, or any other identifying or personal information.
  • the present disclosure recognizes that the use of such personal information data, in the present technology, may be used to the benefit of users.
  • the present disclosure contemplates that the entities responsible for the collection, analysis, disclosure, transfer, storage, or other use of such personal information data will comply with well-established privacy policies and/or privacy practices.
  • such entities should implement and consistently use privacy policies and practices that are generally recognized as meeting or exceeding industry or governmental requirements for maintaining personal information data private and secure.
  • Such policies should be easily accessible by users, and should be updated as the collection and/or use of data changes.
  • Personal information from users should be collected for legitimate and reasonable uses of the entity and not shared or sold outside of those legitimate uses. Further, such collection/sharing should only occur after receiving the informed consent of the users. Additionally, such entities should consider taking any needed steps for safeguarding and securing access to such personal information data and ensuring that others with access to the personal information data adhere to their privacy policies and procedures.
  • policies and practices should be adapted for the particular types of personal information data being collected and/or accessed and adapted to applicable laws and standards, including jurisdiction-specific considerations. For instance, in the US, collection of, or access to, certain health data may be governed by federal and/or state laws, such as the Health Insurance Portability and Accountability Act (HIPAA) ; whereas health data in other countries may be subject to other regulations and policies and should be handled accordingly. Hence different privacy practices should be maintained for different personal data types in each country.
  • HIPAA Health Insurance Portability and Accountability Act
  • the present disclosure also contemplates aspects in which users selectively block the use of, or access to, personal information data. That is, the present disclosure contemplates that hardware and/or software elements can be provided to prevent or block access to such personal information data.
  • the present technology may be configurable to allow users to selectively “opt in” or “opt out” of participation in the collection of personal information data, e.g., during registration for services or anytime thereafter.
  • the present disclosure contemplates providing notifications relating to the access or use of personal information. For instance, a user may be notified upon downloading an app that their personal information data will be accessed and then reminded again just before personal information data is accessed by the app.
  • personal information data should be managed and handled in a way to minimize risks of unintentional or unauthorized access or use. Risk can be minimized by limiting the collection of data and deleting data once it is no longer needed.
  • data de-identification can be used to protect a user’s privacy. De-identification may be facilitated, when appropriate, by removing specific identifiers (e.g., date of birth, etc. ) , controlling the amount or specificity of data stored (e.g., collecting location data a city level rather than at an address level) , controlling how data is stored (e.g., aggregating data across users) , and/or other methods.
  • the present disclosure may broadly cover use of personal information data to implement one or more various disclosed aspects, the present disclosure also contemplates that the various aspects can also be implemented without the need for accessing such personal information data. That is, the various aspects of the present technology are not rendered inoperable due to the lack of all or a portion of such personal information data.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Des approches sont décrites pour fournir une indication de la taille d'un groupage de signaux de référence de démodulation (DMRS) en vue d'une utilisation avec des réseaux non terrestres (par exemple, des satellites) dans des réseaux de communication sans fil de prochaine génération. Ces approches abordent le changement d'avances de temps (TA) en raison du mouvement rapide des satellites. Une approche décrit la procédure pour une indication dynamique de la taille d'un groupage de signaux DRMS. Dans cette approche, le réseau reçoit, de l'équipement d'utilisateur (UE), une taille de fenêtre de domaine temporel (TDW) réelle et réalise une estimation de canal commun sur la base de la fenêtre TDW indiquée par l'UE. Dans une autre approche, la procédure fournit une indication semi-statique de la taille du groupage de signaux DRMS sur la base d'un rapport de capacité d'UE reçu sur une durée de fenêtre TDW et d'une durée de segmentation de liaison montante.
PCT/CN2022/122678 2022-09-29 2022-09-29 Groupage de signaux de référence de démodulation (dmrs) dans des réseaux non terrestres (ntn) WO2024065413A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220225322A1 (en) * 2021-01-14 2022-07-14 Lg Electronics Inc. Coverage enhancement
WO2022153222A1 (fr) * 2021-01-15 2022-07-21 Lenovo (Singapore) Pte. Ltd. Configuration d'un groupement de signaux de référence de démodulation et d'une programmation de bloc de transport
CN115053594A (zh) * 2020-02-13 2022-09-13 高通股份有限公司 解调参考信号时域集束

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CN115053594A (zh) * 2020-02-13 2022-09-13 高通股份有限公司 解调参考信号时域集束
US20220225322A1 (en) * 2021-01-14 2022-07-14 Lg Electronics Inc. Coverage enhancement
WO2022153222A1 (fr) * 2021-01-15 2022-07-21 Lenovo (Singapore) Pte. Ltd. Configuration d'un groupement de signaux de référence de démodulation et d'une programmation de bloc de transport

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LG ELECTRONICS: "Discussions on joint channel estimation for PUSCH", 3GPP DRAFT; R1-2107550, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20210816 - 20210827, 7 August 2021 (2021-08-07), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP052038462 *
NOKIA, NOKIA SHANGHAI BELL: "Joint channel estimation for PUSCH coverage enhancements", 3GPP DRAFT; R1-2109888, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. e-Meeting; 20211011 - 20211019, 1 October 2021 (2021-10-01), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052058816 *

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