WO2021164008A1 - Groupage de réception de dmrs de pdcch guidé par dci - Google Patents

Groupage de réception de dmrs de pdcch guidé par dci Download PDF

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Publication number
WO2021164008A1
WO2021164008A1 PCT/CN2020/076225 CN2020076225W WO2021164008A1 WO 2021164008 A1 WO2021164008 A1 WO 2021164008A1 CN 2020076225 W CN2020076225 W CN 2020076225W WO 2021164008 A1 WO2021164008 A1 WO 2021164008A1
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WIPO (PCT)
Prior art keywords
time interval
trigger
dci
base station
bundle
Prior art date
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PCT/CN2020/076225
Other languages
English (en)
Inventor
Yuwei REN
Ruifeng MA
Huilin Xu
Original Assignee
Qualcomm Incorporated
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 Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to PCT/CN2020/076225 priority Critical patent/WO2021164008A1/fr
Priority to CN202180014789.4A priority patent/CN115298995A/zh
Priority to US17/759,606 priority patent/US20230087095A1/en
Priority to EP21757240.3A priority patent/EP4107899A4/fr
Priority to PCT/CN2021/076846 priority patent/WO2021164726A1/fr
Publication of WO2021164008A1 publication Critical patent/WO2021164008A1/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
    • H04L5/0091—Signaling for the administration of the divided path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • 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
    • 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
    • H04L5/0078—Timing of allocation
    • H04L5/0082—Timing of allocation at predetermined intervals
    • 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
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
    • 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
    • H04L5/0026—Division using four or more dimensions

Definitions

  • aspects of the disclosure relate generally to wireless communications.
  • Wireless communication systems have developed through various generations, including a first-generation analog wireless phone service (1G) , a second-generation (2G) digital wireless phone service (including interim 2.5G and 2.75G networks) , a third-generation (3G) high speed data, Internet-capable wireless service and a fourth-generation (4G) service (e.g., Long Term Evolution (LTE) or WiMax) .
  • 1G first-generation analog wireless phone service
  • 2G second-generation
  • 3G third-generation
  • 4G fourth-generation
  • LTE Long Term Evolution
  • WiMax Worldwide Interoperability for Microwave Access
  • Examples of known cellular systems include the cellular analog advanced mobile phone system (AMPS) , and digital cellular systems based on code division multiple access (CDMA) , frequency division multiple access (FDMA) , time division multiple access (TDMA) , the Global System for Mobile access (GSM) variation of TDMA, etc.
  • AMPS cellular analog advanced mobile phone system
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • GSM Global System for Mobile access
  • a fifth generation (5G) wireless standard referred to as New Radio (NR)
  • NR New Radio
  • the 5G standard according to the Next Generation Mobile Networks Alliance, is designed to provide data rates of several tens of megabits per second to each of tens of thousands of users, with 1 gigabit per second to tens of workers on an office floor.
  • Several hundreds of thousands of simultaneous connections should be supported in order to support large sensor deployments. Consequently, the spectral efficiency of 5G mobile communications should be significantly enhanced compared to the current 4G standard.
  • signaling efficiencies should be enhanced and latency should be substantially reduced compared to current standards.
  • a method of wireless communication performed by a user equipment includes receiving, from a base station in a first time interval, a first trigger indicating that a next time interval after the first time interval is a start of a first bundle of time intervals containing physical downlink control channel (PDCCH) demodulation reference signals (DMRS) , and measuring PDCCH DMRS in each time interval after the first time interval until a second trigger is received from the base station in a second time interval, the second trigger indicating that a next time interval after the second time interval is a start of a second bundle of time intervals containing PDCCH DMRS.
  • PDCCH physical downlink control channel
  • a method of wireless communication performed by a base station includes transmitting, to a UE in a first time interval, a first trigger indicating that a next time interval after the first time interval is a start of a first bundle of time intervals containing PDCCH DMRS, and transmitting, to the UE in a second time interval, a second trigger indicating that a next time interval after the second time interval is a start of a second bundle of time intervals containing PDCCH DMRS, wherein the UE is expected to measure PDCCH DMRS from the base station in each time interval after the first time interval until the second trigger.
  • a UE includes a memory, at least one transceiver, and at least one processor communicatively coupled to the memory and the at least one transceiver, the at least one processor configured to: receive, via the at least one transceiver, from a base station in a first time interval, a first trigger indicating that a next time interval after the first time interval is a start of a first bundle of time intervals containing PDCCH DMRS, and measure PDCCH DMRS in each time interval after the first time interval until a second trigger is received from the base station in a second time interval, the second trigger indicating that a next time interval after the second time interval is a start of a second bundle of time intervals containing PDCCH DMRS.
  • a base station includes a memory, at least one transceiver, and at least one processor communicatively coupled to the memory and the at least one transceiver, the at least one processor configured to: cause the at least one transceiver to transmit, to a UE in a first time interval, a first trigger indicating that a next time interval after the first time interval is a start of a first bundle of time intervals containing PDCCH DMRS, and cause the at least one transceiver to transmit, to the UE in a second time interval, a second trigger indicating that a next time interval after the second time interval is a start of a second bundle of time intervals containing PDCCH DMRS, wherein the UE is expected to measure PDCCH DMRS from the base station in each time interval after the first time interval until the second trigger.
  • a UE includes means for receiving, from a base station in a first time interval, a first trigger indicating that a next time interval after the first time interval is a start of a first bundle of time intervals containing PDCCH DMRS, and means for measuring PDCCH DMRS in each time interval after the first time interval until a second trigger is received from the base station in a second time interval, the second trigger indicating that a next time interval after the second time interval is a start of a second bundle of time intervals containing PDCCH DMRS.
  • a base station includes means for transmitting, to a UE in a first time interval, a first trigger indicating that a next time interval after the first time interval is a start of a first bundle of time intervals containing PDCCH DMRS, and means for transmitting, to the UE in a second time interval, a second trigger indicating that a next time interval after the second time interval is a start of a second bundle of time intervals containing PDCCH DMRS, wherein the UE is expected to measure PDCCH DMRS from the base station in each time interval after the first time interval until the second trigger.
  • a non-transitory computer-readable medium storing computer-executable instructions includes computer-executable instructions comprising: at least one instruction instructing a UE to receive, from a base station in a first time interval, a first trigger indicating that a next time interval after the first time interval is a start of a first bundle of time intervals containing PDCCH DMRS, and at least one instruction instructing the UE to measure PDCCH DMRS in each time interval after the first time interval until a second trigger is received from the base station in a second time interval, the second trigger indicating that a next time interval after the second time interval is a start of a second bundle of time intervals containing PDCCH DMRS.
  • a non-transitory computer-readable medium storing computer-executable instructions includes computer-executable instructions comprising: at least one instruction instructing a base station to transmit, to a UE in a first time interval, a first trigger indicating that a next time interval after the first time interval is a start of a first bundle of time intervals containing PDCCH DMRS, and at least one instruction instructing a base station to transmit, to the UE in a second time interval, a second trigger indicating that a next time interval after the second time interval is a start of a second bundle of time intervals containing PDCCH DMRS, wherein the UE is expected to measure PDCCH DMRS from the base station in each time interval after the first time interval until the second trigger.
  • FIG. 1 illustrates an exemplary wireless communications system, according to various aspects.
  • FIGS. 2A and 2B illustrate example wireless network structures, according to various aspects.
  • FIGS. 3A to 3C are simplified block diagrams of several sample aspects of components that may be employed in wireless communication nodes and configured to support communication as taught herein.
  • FIGS. 4A and 4B are diagrams illustrating example frame structures and channels within the frame structures, according to aspects of the disclosure.
  • FIG. 5 is a diagram of conventional groupings of slots containing PDCCH DMRS.
  • FIGS. 6 and 7 are diagrams illustrating exemplary options for triggering PDCCH DMRS bundles, according to aspects of the present disclosure.
  • FIGS. 8 and 9 illustrate exemplary methods of wireless communication, according to aspects of the disclosure.
  • sequences of actions to be performed by, for example, elements of a computing device. It will be recognized that various actions described herein can be performed by specific circuits (e.g., application specific integrated circuits (ASICs) ) , by program instructions being executed by one or more processors, or by a combination of both. Additionally, the sequence (s) of actions described herein can be considered to be embodied entirely within any form of non-transitory computer-readable storage medium having stored therein a corresponding set of computer instructions that, upon execution, would cause or instruct an associated processor of a device to perform the functionality described herein.
  • ASICs application specific integrated circuits
  • a UE may be any wireless communication device (e.g., a mobile phone, router, tablet computer, laptop computer, tracking device, wearable (e.g., smartwatch, glasses, augmented reality (AR) /virtual reality (VR) headset, etc. ) , vehicle (e.g., automobile, motorcycle, bicycle, etc. ) , Internet of Things (IoT) device, etc. ) used by a user to communicate over a wireless communications network.
  • wireless communication device e.g., a mobile phone, router, tablet computer, laptop computer, tracking device, wearable (e.g., smartwatch, glasses, augmented reality (AR) /virtual reality (VR) headset, etc. )
  • vehicle e.g., automobile, motorcycle, bicycle, etc.
  • IoT Internet of Things
  • a UE may be mobile or may (e.g., at certain times) be stationary, and may communicate with a radio access network (RAN) .
  • RAN radio access network
  • the term “UE” may be referred to interchangeably as an “access terminal” or “AT, ” a “client device, ” a “wireless device, ” a “subscriber device, ” a “subscriber terminal, ” a “subscriber station, ” a “user terminal” or UT, a “mobile terminal, ” a “mobile station, ” or variations thereof.
  • AT access terminal
  • client device e.g., a “wireless device
  • UEs can communicate with a core network via a RAN, and through the core network the UEs
  • a base station may operate according to one of several RATs in communication with UEs depending on the network in which it is deployed, and may be alternatively referred to as an access point (AP) , a network node, a NodeB, an evolved NodeB (eNB) , a New Radio (NR) Node B (also referred to as a gNB or gNodeB) , etc.
  • AP access point
  • eNB evolved NodeB
  • NR New Radio
  • a base station may provide purely edge node signaling functions while in other systems it may provide additional control and/or network management functions.
  • a communication link through which UEs can send signals to a base station is called an uplink (UL) channel (e.g., a reverse traffic channel, a reverse control channel, an access channel, etc. ) .
  • UL uplink
  • a communication link through which the base station can send signals to UEs is called a downlink (DL) or forward link channel (e.g., a paging channel, a control channel, a broadcast channel, a forward traffic channel, etc. ) .
  • DL downlink
  • forward link channel e.g., a paging channel, a control channel, a broadcast channel, a forward traffic channel, etc.
  • TCH traffic channel
  • base station may refer to a single physical transmission-reception point (TRP) or to multiple physical TRPs that may or may not be co-located.
  • TRP transmission-reception point
  • the physical TRP may be an antenna of the base station corresponding to a cell of the base station.
  • the physical TRPs may be an array of antennas (e.g., as in a multiple-input multiple-output (MIMO) system or where the base station employs beamforming) of the base station.
  • MIMO multiple-input multiple-output
  • the physical TRPs may be a distributed antenna system (DAS) (a network of spatially separated antennas connected to a common source via a transport medium) or a remote radio head (RRH) (a remote base station connected to a serving base station) .
  • DAS distributed antenna system
  • RRH remote radio head
  • the non-co-located physical TRPs may be the serving base station receiving the measurement report from the UE and a neighbor base station whose reference RF signals the UE is measuring. Because a TRP is the point from which a base station transmits and receives wireless signals, as used herein, references to transmission from or reception at a base station are to be understood as referring to a particular TRP of the base station.
  • An “RF signal” comprises an electromagnetic wave of a given frequency that transports information through the space between a transmitter and a receiver.
  • a transmitter may transmit a single “RF signal” or multiple “RF signals” to a receiver.
  • the receiver may receive multiple “RF signals” corresponding to each transmitted RF signal due to the propagation characteristics of RF signals through multipath channels.
  • the same transmitted RF signal on different paths between the transmitter and receiver may be referred to as a “multipath” RF signal.
  • FIG. 1 illustrates an exemplary wireless communications system 100.
  • the wireless communications system 100 (which may also be referred to as a wireless wide area network (WWAN) ) may include various base stations 102 (labeled “BS” ) and various UEs 104.
  • the base stations 102 may include macro cell base stations (high power cellular base stations) and/or small cell base stations (low power cellular base stations) .
  • the macro cell base stations 102 may include eNBs where the wireless communications system 100 corresponds to an LTE network, or gNBs where the wireless communications system 100 corresponds to a NR network, or a combination of both, and the small cell base stations may include femtocells, picocells, microcells, etc.
  • the base stations 102 may collectively form a RAN and interface with a core network 170 (e.g., an evolved packet core (EPC) or next generation core (NGC) ) through backhaul links 122, and through the core network 170 to one or more location servers 172.
  • a core network 170 e.g., an evolved packet core (EPC) or next generation core (NGC)
  • EPC evolved packet core
  • NTC next generation core
  • the base stations 102 may perform functions that relate to one or more of transferring user data, radio channel ciphering and deciphering, integrity protection, header compression, mobility control functions (e.g., handover, dual connectivity) , inter-cell interference coordination, connection setup and release, load balancing, distribution for non-access stratum (NAS) messages, NAS node selection, synchronization, RAN sharing, multimedia broadcast multicast service (MBMS) , subscriber and equipment trace, RAN information management (RIM) , paging, positioning, and delivery of warning messages.
  • the base stations 102 may communicate with each other directly or indirectly (e.g., through the EPC /NGC) over backhaul links 134, which may be wired or wireless.
  • the base stations 102 may wirelessly communicate with the UEs 104. Each of the base stations 102 may provide communication coverage for a respective geographic coverage area 110. In an aspect, one or more cells may be supported by a base station 102 in each geographic coverage area 110.
  • a “cell” is a logical communication entity used for communication with a base station (e.g., over some frequency resource, referred to as a carrier frequency, component carrier, carrier, band, or the like) , and may be associated with an identifier (e.g., a physical cell identifier (PCI) , a virtual cell identifier (VCI) ) for distinguishing cells operating via the same or a different carrier frequency.
  • PCI physical cell identifier
  • VCI virtual cell identifier
  • different cells may be configured according to different protocol types (e.g., machine-type communication (MTC) , narrowband IoT (NB-IoT) , enhanced mobile broadband (eMBB) , or others) that may provide access for different types of UEs.
  • MTC machine-type communication
  • NB-IoT narrowband IoT
  • eMBB enhanced mobile broadband
  • a cell may refer to either or both the logical communication entity and the base station that supports it, depending on the context.
  • the term “cell” may also refer to a geographic coverage area of a base station (e.g., a sector) , insofar as a carrier frequency can be detected and used for communication within some portion of geographic coverage areas 110.
  • While neighboring macro cell base station 102 geographic coverage areas 110 may partially overlap (e.g., in a handover region) , some of the geographic coverage areas 110 may be substantially overlapped by a larger geographic coverage area 110.
  • a small cell base station 102' (labeled “SC” for “small cell” ) may have a coverage area 110'that substantially overlaps with the geographic coverage area 110 of one or more macro cell base stations 102.
  • a network that includes both small cell and macro cell base stations may be known as a heterogeneous network.
  • a heterogeneous network may also include home eNBs (HeNBs) , which may provide service to a restricted group known as a closed subscriber group (CSG) .
  • HeNBs home eNBs
  • CSG closed subscriber group
  • the communication links 120 between the base stations 102 and the UEs 104 may include UL (also referred to as reverse link) transmissions from a UE 104 to a base station 102 and/or downlink (DL) (also referred to as forward link) transmissions from a base station 102 to a UE 104.
  • the communication links 120 may use MIMO antenna technology, including spatial multiplexing, beamforming, and/or transmit diversity.
  • the communication links 120 may be through one or more carrier frequencies. Allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or less carriers may be allocated for DL than for UL) .
  • the wireless communications system 100 may further include a wireless local area network (WLAN) access point (AP) 150 in communication with WLAN stations (STAs) 152 via communication links 154 in an unlicensed frequency spectrum (e.g., 5 GHz) .
  • WLAN STAs 152 and/or the WLAN AP 150 may perform a clear channel assessment (CCA) or listen before talk (LBT) procedure prior to communicating in order to determine whether the channel is available.
  • CCA clear channel assessment
  • LBT listen before talk
  • the small cell base station 102' may operate in a licensed and/or an unlicensed frequency spectrum. When operating in an unlicensed frequency spectrum, the small cell base station 102'may employ LTE or NR technology and use the same 5 GHz unlicensed frequency spectrum as used by the WLAN AP 150.
  • NR in unlicensed spectrum may be referred to as NR-U.
  • LTE in an unlicensed spectrum may be referred to as LTE-U, licensed assisted access (LAA) , or MulteFire.
  • the wireless communications system 100 may further include a millimeter wave (mmW) base station 180 that may operate in mmW frequencies and/or near mmW frequencies in communication with a UE 182.
  • Extremely high frequency (EHF) is part of the RF in the electromagnetic spectrum. EHF has a range of 30 GHz to 300 GHz and a wavelength between 1 millimeter and 10 millimeters. Radio waves in this band may be referred to as a millimeter wave.
  • Near mmW may extend down to a frequency of 3 GHz with a wavelength of 100 millimeters.
  • the super high frequency (SHF) band extends between 3 GHz and 30 GHz, also referred to as centimeter wave.
  • the mmW base station 180 and the UE 182 may utilize beamforming (transmit and/or receive) over a mmW communication link 184 to compensate for the extremely high path loss and short range.
  • one or more base stations 102 may also transmit using mmW or near mmW and beamforming. Accordingly, it will be appreciated that the foregoing illustrations are merely examples and should not be construed to limit the various aspects disclosed herein.
  • Transmit beamforming is a technique for focusing an RF signal in a specific direction.
  • a network node e.g., a base station
  • transmit beamforming the network node determines where a given target device (e.g., a UE) is located (relative to the transmitting network node) and projects a stronger downlink RF signal in that specific direction, thereby providing a faster (in terms of data rate) and stronger RF signal for the receiving device (s) .
  • a network node can control the phase and relative amplitude of the RF signal at each of the one or more transmitters that are broadcasting the RF signal.
  • a network node may use an array of antennas (referred to as a “phased array” or an “antenna array” ) that creates a beam of RF waves that can be “steered” to point in different directions, without actually moving the antennas.
  • the RF current from the transmitter is fed to the individual antennas with the correct phase relationship so that the radio waves from the separate antennas add together to increase the radiation in a desired direction, while cancelling to suppress radiation in undesired directions.
  • Transmit beams may be quasi-collocated, meaning that they appear to the receiver (e.g., a UE) as having the same parameters, regardless of whether or not the transmitting antennas of the network node themselves are physically collocated.
  • the receiver e.g., a UE
  • QCL relation of a given type means that certain parameters about a second reference RF signal on a second beam can be derived from information about a source reference RF signal on a source beam.
  • the receiver can use the source reference RF signal to estimate the Doppler shift, Doppler spread, average delay, and delay spread of a second reference RF signal transmitted on the same channel.
  • the receiver can use the source reference RF signal to estimate the Doppler shift and Doppler spread of a second reference RF signal transmitted on the same channel. If the source reference RF signal is QCL Type C, the receiver can use the source reference RF signal to estimate the Doppler shift and average delay of a second reference RF signal transmitted on the same channel. If the source reference RF signal is QCL Type D, the receiver can use the source reference RF signal to estimate the spatial receive parameter of a second reference RF signal transmitted on the same channel.
  • the receiver uses a receive beam to amplify RF signals detected on a given channel. For example, the receiver can increase the gain setting and/or adjust the phase setting of an array of antennas in a particular direction to amplify (e.g., to increase the gain level of) the RF signals received from that direction.
  • a receiver is said to beamform in a certain direction, it means the beam gain in that direction is high relative to the beam gain along other directions, or the beam gain in that direction is the highest compared to the beam gain in that direction of all other receive beams available to the receiver.
  • RSRP reference signal received power
  • RSRQ reference signal received quality
  • SINR signal-to-interference-plus-noise ratio
  • Transmit and receive beams may be spatially related.
  • a spatial relation means that parameters for a second beam (e.g., a transmit or receive beam) for a second reference signal can be derived from information about a first beam (e.g., a receive beam or a transmit beam) for a first reference signal.
  • a UE may use a particular receive beam to receive a reference downlink reference signal (e.g., synchronization signal block (SSB) ) from a base station.
  • the UE can then form a transmit beam for sending an uplink reference signal (e.g., sounding reference signal (SRS) ) to that base station based on the parameters of the receive beam.
  • an uplink reference signal e.g., sounding reference signal (SRS)
  • a “downlink” beam may be either a transmit beam or a receive beam, depending on the entity forming it. For example, if a base station is forming the downlink beam to transmit a reference signal to a UE, the downlink beam is a transmit beam. If the UE is forming the downlink beam, however, it is a receive beam to receive the downlink reference signal.
  • an “uplink” beam may be either a transmit beam or a receive beam, depending on the entity forming it. For example, if a base station is forming the uplink beam, it is an uplink receive beam, and if a UE is forming the uplink beam, it is an uplink transmit beam.
  • the frequency spectrum in which wireless nodes is divided into multiple frequency ranges, FR1 (from 450 to 6000 MHz) , FR2 (from 24250 to 52600 MHz) , FR3 (above 52600 MHz) , and FR4 (between FR1 and FR2) .
  • FR1 from 450 to 6000 MHz
  • FR2 from 24250 to 52600 MHz
  • FR3 above 52600 MHz
  • FR4 between FR1 and FR2
  • one of the carrier frequencies is referred to as the “primary carrier” or “anchor carrier” or “primary serving cell” or “PCell, ” and the remaining carrier frequencies are referred to as “secondary carriers” or “secondary serving cells” or “SCells.
  • the anchor carrier is the carrier operating on the primary frequency (e.g., FR1) utilized by a UE 104/182 and the cell in which the UE 104/182 either performs the initial radio resource control (RRC) connection establishment procedure or initiates the RRC connection re-establishment procedure.
  • the primary carrier carries all common and UE-specific control channels, and may be a carrier in a licensed frequency (however, this is not always the case) .
  • a secondary carrier is a carrier operating on a second frequency (e.g., FR2) that may be configured once the RRC connection is established between the UE 104 and the anchor carrier and that may be used to provide additional radio resources.
  • the secondary carrier may be a carrier in an unlicensed frequency.
  • the secondary carrier may contain only necessary signaling information and signals, for example, those that are UE-specific may not be present in the secondary carrier, since both primary uplink and downlink carriers are typically UE-specific. This means that different UEs 104/182 in a cell may have different downlink primary carriers. The same is true for the uplink primary carriers.
  • the network is able to change the primary carrier of any UE 104/182 at any time. This is done, for example, to balance the load on different carriers.
  • a “serving cell” (whether a PCell or an SCell) corresponds to a carrier frequency /component carrier over which some base station is communicating, the term “cell, ” “serving cell, ” “component carrier, ” “carrier frequency, ” and the like can be used interchangeably.
  • one of the frequencies utilized by the macro cell base stations 102 may be an anchor carrier (or “PCell” ) and other frequencies utilized by the macro cell base stations 102 and/or the mmW base station 180 may be secondary carriers ( “SCells” ) .
  • the simultaneous transmission and/or reception of multiple carriers enables the UE 104/182 to significantly increase its data transmission and/or reception rates. For example, two 20 MHz aggregated carriers in a multi-carrier system would theoretically lead to a two-fold increase in data rate (i.e., 40 MHz) , compared to that attained by a single 20 MHz carrier.
  • the wireless communications system 100 may further include one or more UEs, such as UE 190, that connects indirectly to one or more communication networks via one or more device-to-device (D2D) peer-to-peer (P2P) links.
  • D2D device-to-device
  • P2P peer-to-peer
  • UE 190 has a D2D P2P link 192 with one of the UEs 104 connected to one of the base stations 102 (e.g., through which UE 190 may indirectly obtain cellular connectivity) and a D2D P2P link 194 with WLAN STA 152 connected to the WLAN AP 150 (through which UE 190 may indirectly obtain WLAN-based Internet connectivity) .
  • the D2D P2P links 192 and 194 may be supported with any well-known D2D RAT, such as LTE Direct (LTE-D) , WiFi Direct (WiFi-D) , and so on.
  • the wireless communications system 100 may further include a UE 164 that may communicate with a macro cell base station 102 over a communication link 120 and/or the mmW base station 180 over a mmW communication link 184.
  • the macro cell base station 102 may support a PCell and one or more SCells for the UE 164 and the mmW base station 180 may support one or more SCells for the UE 164.
  • FIG. 2A illustrates an exemplary wireless network structure 200.
  • an NGC 210 also referred to as a “5GC”
  • C-plane control plane functions
  • U-plane user plane functions
  • User plane interface (NG-U) 213 and control plane interface (NG-C) 215 connect the gNB 222 to the NGC 210 and specifically to the user plane functions 212 and control plane functions 214, respectively.
  • an eNB 224 may also be connected to the NGC 210 via NG-C 215 to the control plane functions 214 and NG-U 213 to user plane functions 212. Further, eNB 224 may directly communicate with gNB 222 via a backhaul connection 223. In some configurations, the New RAN 220 may only have one or more gNBs 222, while other configurations include one or more of both eNBs 224 and gNBs 222. Either gNB 222 or eNB 224 may communicate with UEs 204 (e.g., any of the UEs depicted in FIG. 1) .
  • location server 230 may be in communication with the NGC 210 to provide location assistance for UEs 204.
  • the location server 230 can be implemented as a plurality of separate servers (e.g., physically separate servers, different software modules on a single server, different software modules spread across multiple physical servers, etc. ) , or alternately may each correspond to a single server.
  • the location server 230 can be configured to support one or more location services for UEs 204 that can connect to the location server 230 via the core network, NGC 210, and/or via the Internet (not illustrated) . Further, the location server 230 may be integrated into a component of the core network, or alternatively may be external to the core network.
  • FIG. 2B illustrates another exemplary wireless network structure 250.
  • an NGC 260 (also referred to as a “5GC” ) can be viewed functionally as control plane functions, provided by an access and mobility management function (AMF) /user plane function (UPF) 264, and user plane functions, provided by a session management function (SMF) 262, which operate cooperatively to form the core network (i.e., NGC 260) .
  • AMF access and mobility management function
  • UPF user plane function
  • SMF session management function
  • User plane interface 263 and control plane interface 265 connect the eNB 224 to the NGC 260 and specifically to SMF 262 and AMF/UPF 264, respectively.
  • a gNB 222 may also be connected to the NGC 260 via control plane interface 265 to AMF/UPF 264 and user plane interface 263 to SMF 262. Further, eNB 224 may directly communicate with gNB 222 via the backhaul connection 223, with or without gNB direct connectivity to the NGC 260.
  • the New RAN 220 may only have one or more gNBs 222, while other configurations include one or more of both eNBs 224 and gNBs 222. Either gNB 222 or eNB 224 may communicate with UEs 204 (e.g., any of the UEs depicted in FIG. 1) .
  • the base stations of the New RAN 220 communicate with the AMF-side of the AMF/UPF 264 over the N2 interface and the UPF-side of the AMF/UPF 264 over the N3 interface.
  • the functions of the AMF include registration management, connection management, reachability management, mobility management, lawful interception, transport for session management (SM) messages between the UE 204 and the SMF 262, transparent proxy services for routing SM messages, access authentication and access authorization, transport for short message service (SMS) messages between the UE 204 and the short message service function (SMSF) (not shown) , and security anchor functionality (SEAF) .
  • the AMF also interacts with the authentication server function (AUSF) (not shown) and the UE 204, and receives the intermediate key that was established as a result of the UE 204 authentication process.
  • AUSF authentication server function
  • the AMF retrieves the security material from the AUSF.
  • the functions of the AMF also include security context management (SCM) .
  • SCM receives a key from the SEAF that it uses to derive access-network specific keys.
  • the functionality of the AMF also includes location services management for regulatory services, transport for location services messages between the UE 204 and the location management function (LMF) 270, as well as between the New RAN 220 and the LMF 270, evolved packet system (EPS) bearer identifier allocation for interworking with the EPS, and UE 204 mobility event notification.
  • the AMF also supports functionalities for non-3GPP access networks.
  • Functions of the UPF include acting as an anchor point for intra-/inter-RAT mobility (when applicable) , acting as an external protocol data unit (PDU) session point of interconnect to the data network (not shown) , providing packet routing and forwarding, packet inspection, user plane policy rule enforcement (e.g., gating, redirection, traffic steering) , lawful interception (user plane collection) , traffic usage reporting, quality of service (QoS) handling for the user plane (e.g., UL/DL rate enforcement, reflective QoS marking in the DL) , UL traffic verification (service data flow (SDF) to QoS flow mapping) , transport level packet marking in the UL and DL, DL packet buffering and DL data notification triggering, and sending and forwarding of one or more “end markers” to the source RAN node.
  • PDU protocol data unit
  • the functions of the SMF 262 include session management, UE Internet protocol (IP) address allocation and management, selection and control of user plane functions, configuration of traffic steering at the UPF to route traffic to the proper destination, control of part of policy enforcement and QoS, and downlink data notification.
  • IP Internet protocol
  • the interface over which the SMF 262 communicates with the AMF-side of the AMF/UPF 264 is referred to as the N11 interface.
  • LMF 270 may be in communication with the NGC 260 to provide location assistance for UEs 204.
  • the LMF 270 can be implemented as a plurality of separate servers (e.g., physically separate servers, different software modules on a single server, different software modules spread across multiple physical servers, etc. ) , or alternately may each correspond to a single server.
  • the LMF 270 can be configured to support one or more location services for UEs 204 that can connect to the LMF 270 via the core network, NGC 260, and/or via the Internet (not illustrated) .
  • FIGS. 3A, 3B, and 3C illustrate several exemplary components (represented by corresponding blocks) that may be incorporated into a UE 302 (which may correspond to any of the UEs described herein) , a base station 304 (which may correspond to any of the base stations described herein) , and a network entity 306 (which may correspond to or embody any of the network functions described herein, including the location server 230 and the LMF 270) to support the file transmission operations as taught herein.
  • these components may be implemented in different types of apparatuses in different implementations (e.g., in an ASIC, in a system-on-chip (SoC) , etc. ) .
  • the illustrated components may also be incorporated into other apparatuses in a communication system.
  • other apparatuses in a system may include components similar to those described to provide similar functionality.
  • a given apparatus may contain one or more of the components.
  • an apparatus may include multiple transceiver components that enable the apparatus to operate on multiple carriers and/or communicate via different technologies.
  • the UE 302 and the base station 304 each include wireless wide area network (WWAN) transceiver 310 and 350, respectively, configured to communicate via one or more wireless communication networks (not shown) , such as an NR network, an LTE network, a GSM network, and/or the like.
  • the WWAN transceivers 310 and 350 may be connected to one or more antennas 316 and 356, respectively, for communicating with other network nodes, such as other UEs, access points, base stations (e.g., eNBs, gNBs) , etc., via at least one designated RAT (e.g., NR, LTE, GSM, etc.
  • RAT e.g., NR, LTE, GSM, etc.
  • the WWAN transceivers 310 and 350 may be variously configured for transmitting and encoding signals 318 and 358 (e.g., messages, indications, information, and so on) , respectively, and, conversely, for receiving and decoding signals 318 and 358 (e.g., messages, indications, information, pilots, and so on), respectively, in accordance with the designated RAT.
  • signals 318 and 358 e.g., messages, indications, information, and so on
  • decoding signals 318 and 358 e.g., messages, indications, information, pilots, and so on
  • the transceivers 310 and 350 include one or more transmitters 314 and 354, respectively, for transmitting and encoding signals 318 and 358, respectively, and one or more receivers 312 and 352, respectively, for receiving and decoding signals 318 and 358, respectively.
  • the UE 302 and the base station 304 also include, at least in some cases, wireless local area network (WLAN) transceivers 320 and 360, respectively.
  • WLAN transceivers 320 and 360 may be connected to one or more antennas 326 and 366, respectively, for communicating with other network nodes, such as other UEs, access points, base stations, etc., via at least one designated RAT (e.g., WiFi, LTE-D, etc. ) over a wireless communication medium of interest.
  • RAT e.g., WiFi, LTE-D, etc.
  • the WLAN transceivers 320 and 360 may be variously configured for transmitting and encoding signals 328 and 368 (e.g., messages, indications, information, and so on) , respectively, and, conversely, for receiving and decoding signals 328 and 368 (e.g., messages, indications, information, pilots, and so on) , respectively, in accordance with the designated RAT.
  • the transceivers 320 and 360 include one or more transmitters 324 and 364, respectively, for transmitting and encoding signals 328 and 368, respectively, and one or more receivers 322 and 362, respectively, for receiving and decoding signals 328 and 368, respectively.
  • Transceiver circuitry including at least one transmitter and at least one receiver may comprise an integrated device (e.g., embodied as a transmitter circuit and a receiver circuit of a single communication device) in some implementations, may comprise a separate transmitter device and a separate receiver device in some implementations, or may be embodied in other ways in other implementations.
  • a transmitter may include or be coupled to a plurality of antennas (e.g., antennas 316, 326, 356, 366) , such as an antenna array, that permits the respective apparatus to perform transmit “beamforming, ” as described herein.
  • a receiver may include or be coupled to a plurality of antennas (e.g., antennas 316, 326, 356, 366) , such as an antenna array, that permits the respective apparatus to perform receive beamforming, as described herein.
  • the transmitter and receiver may share the same plurality of antennas (e.g., antennas 316, 326, 356, 366) , such that the respective apparatus can only receive or transmit at a given time, not both at the same time.
  • a wireless communication device e.g., one or both of the transceivers 310 and 320 and/or 350 and 360
  • NLM network listen module
  • the UE 302 and the base station 304 also include, at least in some cases, satellite positioning systems (SPS) receivers 330 and 370.
  • the SPS receivers 330 and 370 may be connected to one or more antennas 336 and 376, respectively, for receiving SPS signals 338 and 378, respectively, such as global positioning system (GPS) signals, global navigation satellite system (GLONASS) signals, Galileo signals, Beidou signals, Indian Regional Navigation Satellite System (NAVIC) , Quasi-Zenith Satellite System (QZSS) , etc.
  • the SPS receivers 330 and 370 may comprise any suitable hardware and/or software for receiving and processing SPS signals 338 and 378, respectively.
  • the SPS receivers 330 and 370 request information and operations as appropriate from the other systems, and performs calculations necessary to determine positions of the UE 302 and the base station 304 using measurements obtained by any suitable SPS algorithm.
  • the base station 304 and the network entity 306 each include at least one network interfaces 380 and 390 for communicating with other network entities.
  • the network interfaces 380 and 390 e.g., one or more network access ports
  • the network interfaces 380 and 390 may be implemented as transceivers configured to support wire-based or wireless signal communication. This communication may involve, for example, sending and receiving messages, parameters, and/or other types of information.
  • the UE 302, the base station 304, and the network entity 306 also include other components that may be used in conjunction with the operations as disclosed herein.
  • the UE 302 includes processor circuitry implementing a processing system 332 for providing functionality relating to, for example, performing PDCCH DMRS measurements, and for providing other processing functionality.
  • the base station 304 includes a processing system 384 for providing functionality relating to, for example, transmitting bundled PDCCH DMRS as disclosed herein, and for providing other processing functionality.
  • the network entity 306 includes a processing system 394 for providing functionality relating to, for example, configuring bundled PDCCH DMRS as disclosed herein, and for providing other processing functionality.
  • the processing systems 332, 384, and 394 may include, for example, one or more general purpose processors, multi-core processors, ASICs, digital signal processors (DSPs) , field programmable gate arrays (FPGA) , or other programmable logic devices or processing circuitry.
  • general purpose processors multi-core processors
  • ASICs application-specific integrated circuits
  • DSPs digital signal processors
  • FPGA field programmable gate arrays
  • FPGA field programmable gate arrays
  • the UE 302, the base station 304, and the network entity 306 include memory circuitry implementing memory components 340, 386, and 396 (e.g., each including a memory device) , respectively, for maintaining information (e.g., information indicative of reserved resources, thresholds, parameters, and so on) .
  • the UE 302, the base station 304, and the network entity 306 may include PDCCH DMRS measurement components 342, 388, and 398, respectively.
  • the PDCCH DMRS measurement components 342, 388, and 398 may be hardware circuits that are part of or coupled to the processing systems 332, 384, and 394, respectively, that, when executed, cause the UE 302, the base station 304, and the network entity 306 to perform the functionality described herein.
  • the PDCCH DMRS measurement components 342, 388, and 398 may be external to the processing systems 332, 384, and 394 (e.g., part of a modem processing system, integrated with another processing system, etc. ) .
  • the PDCCH DMRS measurement components 342, 388, and 398 may be memory modules (as shown in FIGS.
  • 3A-C stored in the memory components 340, 386, and 396, respectively, that, when executed by the processing systems 332, 384, and 394 (or a modem processing system, another processing system, etc. ) , cause the UE 302, the base station 304, and the network entity 306 to perform the functionality described herein.
  • the UE 302 may include one or more sensors 344 coupled to the processing system 332 to provide movement and/or orientation information that is independent of motion data derived from signals received by the WWAN transceiver 310, the WLAN transceiver 320, and/or the SPS receiver 330.
  • the sensor (s) 344 may include an accelerometer (e.g., a micro-electrical mechanical systems (MEMS) device) , a gyroscope, a geomagnetic sensor (e.g., a compass) , an altimeter (e.g., a barometric pressure altimeter) , and/or any other type of movement detection sensor.
  • MEMS micro-electrical mechanical systems
  • the senor (s) 344 may include a plurality of different types of devices and combine their outputs in order to provide motion information.
  • the sensor (s) 344 may use a combination of a multi-axis accelerometer and orientation sensors to provide the ability to compute positions in 2D and/or 3D coordinate systems.
  • the UE 302 includes a user interface 346 for providing indications (e.g., audible and/or visual indications) to a user and/or for receiving user input (e.g., upon user actuation of a sensing device such a keypad, a touch screen, a microphone, and so on) .
  • a user interface 346 for providing indications (e.g., audible and/or visual indications) to a user and/or for receiving user input (e.g., upon user actuation of a sensing device such a keypad, a touch screen, a microphone, and so on) .
  • the base station 304 and the network entity 306 may also include user interfaces.
  • IP packets from the network entity 306 may be provided to the processing system 384.
  • the processing system 384 may implement functionality for an RRC layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a medium access control (MAC) layer.
  • PDCP packet data convergence protocol
  • RLC radio link control
  • MAC medium access control
  • the processing system 384 may provide RRC layer functionality associated with broadcasting of system information (e.g., master information block (MIB) , system information blocks (SIBs) ) , RRC connection control (e.g., RRC connection paging, RRC connection establishment, RRC connection modification, and RRC connection release) , inter-RAT mobility, and measurement configuration for UE measurement reporting; PDCP layer functionality associated with header compression/decompression, security (ciphering, deciphering, integrity protection, integrity verification) , and handover support functions; RLC layer functionality associated with the transfer of upper layer packet data units (PDUs) , error correction through automatic repeat request (ARQ) , concatenation, segmentation, and reassembly of RLC service data units (SDUs) , re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, scheduling information reporting, error correction, priority handling, and logical channel
  • the transmitter 354 and the receiver 352 may implement Layer-1 functionality associated with various signal processing functions.
  • Layer-1 which includes a physical (PHY) layer, may include error detection on the transport channels, forward error correction (FEC) coding/decoding of the transport channels, interleaving, rate matching, mapping onto physical channels, modulation/demodulation of physical channels, and MIMO antenna processing.
  • the transmitter 354 handles mapping to signal constellations based on various modulation schemes (e.g., binary phase-shift keying (BPSK) , quadrature phase-shift keying (QPSK) , M-phase-shift keying (M-PSK) , M-quadrature amplitude modulation (M-QAM) ) .
  • BPSK binary phase-shift keying
  • QPSK quadrature phase-shift keying
  • M-PSK M-phase-shift keying
  • M-QAM M-quadrature amplitude modulation
  • Each stream may then be mapped to an orthogonal frequency division multiplexing (OFDM) subcarrier, multiplexed with a reference signal (e.g., pilot) in the time and/or frequency domain, and then combined together using an inverse fast Fourier transform (IFFT) to produce a physical channel carrying a time domain OFDM symbol stream.
  • OFDM symbol stream is spatially precoded to produce multiple spatial streams.
  • Channel estimates from a channel estimator may be used to determine the coding and modulation scheme, as well as for spatial processing.
  • the channel estimate may be derived from a reference signal and/or channel condition feedback transmitted by the UE 302.
  • Each spatial stream may then be provided to one or more different antennas 356.
  • the transmitter 354 may modulate an RF carrier with a respective spatial stream for transmission.
  • the receiver 312 receives a signal through its respective antenna (s) 316.
  • the receiver 312 recovers information modulated onto an RF carrier and provides the information to the processing system 332.
  • the transmitter 314 and the receiver 312 implement Layer-1 functionality associated with various signal processing functions.
  • the receiver 312 may perform spatial processing on the information to recover any spatial streams destined for the UE 302. If multiple spatial streams are destined for the UE 302, they may be combined by the receiver 312 into a single OFDM symbol stream.
  • the receiver 312 then converts the OFDM symbol stream from the time-domain to the frequency domain using a fast Fourier transform (FFT) .
  • the frequency domain signal comprises a separate OFDM symbol stream for each subcarrier of the OFDM signal.
  • FFT fast Fourier transform
  • the symbols on each subcarrier, and the reference signal are recovered and demodulated by determining the most likely signal constellation points transmitted by the base station 304. These soft decisions may be based on channel estimates computed by a channel estimator. The soft decisions are then decoded and de-interleaved to recover the data and control signals that were originally transmitted by the base station 304 on the physical channel. The data and control signals are then provided to the processing system 332, which implements Layer-3 and Layer-2 functionality.
  • the processing system 332 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, and control signal processing to recover IP packets from the core network.
  • the processing system 332 is also responsible for error detection.
  • the processing system 332 provides RRC layer functionality associated with system information (e.g., MIB, SIBs) acquisition, RRC connections, and measurement reporting; PDCP layer functionality associated with header compression/decompression, and security (ciphering, deciphering, integrity protection, integrity verification) ; RLC layer functionality associated with the transfer of upper layer PDUs, error correction through ARQ, concatenation, segmentation, and reassembly of RLC SDUs, re-segmentation of RLC data PDUs, and reordering of RLC data PDUs; and MAC layer functionality associated with mapping between logical channels and transport channels, multiplexing of MAC SDUs onto transport blocks (TBs) , demultiplexing of MAC SDUs from TBs, scheduling information reporting, error correction through hybrid automatic repeat request (HARQ) , priority handling, and logical channel prioritization.
  • RRC layer functionality associated with system information (e.g., MIB, SIBs) acquisition, RRC connections, and measurement reporting
  • Channel estimates derived by the channel estimator from a reference signal or feedback transmitted by the base station 304 may be used by the transmitter 314 to select the appropriate coding and modulation schemes, and to facilitate spatial processing.
  • the spatial streams generated by the transmitter 314 may be provided to different antenna (s) 316.
  • the transmitter 314 may modulate an RF carrier with a respective spatial stream for transmission.
  • the UL transmission is processed at the base station 304 in a manner similar to that described in connection with the receiver function at the UE 302.
  • the receiver 352 receives a signal through its respective antenna (s) 356.
  • the receiver 352 recovers information modulated onto an RF carrier and provides the information to the processing system 384.
  • the processing system 384 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover IP packets from the UE 302. IP packets from the processing system 384 may be provided to the core network.
  • the processing system 384 is also responsible for error detection.
  • the UE 302, the base station 304, and/or the network entity 306 are shown in FIGS. 3A-C as including various components that may be configured according to the various examples described herein. It will be appreciated, however, that the illustrated blocks may have different functionality in different designs.
  • the various components of the UE 302, the base station 304, and the network entity 306 may communicate with each other over data buses 334, 382, and 392, respectively.
  • the components of FIGS. 3A-C may be implemented in various ways.
  • the components of FIGS. 3A-C may be implemented in one or more circuits such as, for example, one or more processors and/or one or more ASICs (which may include one or more processors) .
  • each circuit may use and/or incorporate at least one memory component for storing information or executable code used by the circuit to provide this functionality.
  • some or all of the functionality represented by blocks 310 to 346 may be implemented by processor and memory component (s) of the UE 302 (e.g., by execution of appropriate code and/or by appropriate configuration of processor components) .
  • some or all of the functionality represented by blocks 350 to 388 may be implemented by processor and memory component (s) of the base station 304 (e.g., by execution of appropriate code and/or by appropriate configuration of processor components) .
  • some or all of the functionality represented by blocks 390 to 398 may be implemented by processor and memory component (s) of the network entity 306 (e.g., by execution of appropriate code and/or by appropriate configuration of processor components) .
  • FIG. 4A is a diagram 400 illustrating an example of a DL frame structure, according to aspects of the disclosure.
  • FIG. 4B is a diagram 430 illustrating an example of channels within the DL frame structure, according to aspects of the disclosure.
  • Other wireless communications technologies may have a different frame structures and/or different channels.
  • LTE and in some cases NR, utilizes OFDM on the downlink and single-carrier frequency division multiplexing (SC-FDM) on the uplink.
  • SC-FDM single-carrier frequency division multiplexing
  • OFDM and SC-FDM partition the system bandwidth into multiple (K) orthogonal subcarriers, which are also commonly referred to as tones, bins, etc.
  • K multiple orthogonal subcarriers
  • Each subcarrier may be modulated with data.
  • modulation symbols are sent in the frequency domain with OFDM and in the time domain with SC-FDM.
  • the spacing between adjacent subcarriers may be fixed, and the total number of subcarriers (K) may be dependent on the system bandwidth.
  • the spacing of the subcarriers may be 15 kHz and the minimum resource allocation (resource block) may be 12 subcarriers (or 180 kHz) . Consequently, the nominal FFT size may be equal to 128, 256, 512, 1024, or 2048 for system bandwidth of 1.25, 2.5, 5, 10, or 20 megahertz (MHz) , respectively.
  • the system bandwidth may also be partitioned into subbands. For example, a subband may cover 1.08 MHz (i.e., 6 resource blocks) , and there may be 1, 2, 4, 8, or 16 subbands for system bandwidth of 1.25, 2.5, 5, 10, or 20 MHz, respectively.
  • LTE supports a single numerology (subcarrier spacing, symbol length, etc. ) .
  • NR may support multiple numerologies, for example, subcarrier spacing of 15 kHz, 30 kHz, 60 kHz, 120 kHz and 240 kHz or greater may be available. Table 1 provided below lists some various parameters for different NR numerologies.
  • a numerology of 15 kHz is used.
  • a frame e.g., 10 ms
  • each subframe includes one time slot.
  • time is represented horizontally (e.g., on the X axis) with time increasing from left to right
  • frequency is represented vertically (e.g., on the Y axis) with frequency increasing (or decreasing) from bottom to top.
  • a resource grid may be used to represent time slots, each time slot including one or more time concurrent resource blocks (RBs) (also referred to as physical RBs (PRBs) ) in the frequency domain.
  • the resource grid is further divided into multiple resource elements (REs) .
  • An RE may correspond to one symbol length in the time domain and one subcarrier in the frequency domain.
  • an RB may contain 12 consecutive subcarriers in the frequency domain and seven consecutive symbols in the time domain, for a total of 84 REs.
  • an RB may contain 12 consecutive subcarriers in the frequency domain and six consecutive symbols in the time domain, for a total of 72 REs.
  • the number of bits carried by each RE depends on the modulation scheme.
  • the DL-RS may include demodulation reference signals (DMRS) , channel state information reference signals (CSI-RS) , cell-specific reference signals (CRS) , positioning reference signals (PRS) , navigation reference signals (NRS) , tracking reference signals (TRS) , etc., exemplary locations of which are labeled “R” in FIG. 4A.
  • DMRS demodulation reference signals
  • CSI-RS channel state information reference signals
  • CRS cell-specific reference signals
  • PRS positioning reference signals
  • NRS navigation reference signals
  • TRS tracking reference signals
  • FIG. 4B illustrates an example of various channels within a downlink slot of a radio frame.
  • the channel bandwidth or system bandwidth, is divided into multiple bandwidth parts (BWPs) .
  • a BWP is a contiguous set of PRBs selected from a contiguous subset of the common RBs for a given numerology on a given carrier.
  • a maximum of four BWPs can be specified in the downlink and uplink. That is, a UE can be configured with up to four BWPs on the downlink, and up to four BWPs on the uplink. Only one BWP (uplink or downlink) may be active at a given time, meaning the UE may only receive or transmit over one BWP at a time.
  • the bandwidth of each BWP should be equal to or greater than the bandwidth of the SSB, but it may or may not contain the SSB.
  • a primary synchronization signal is used by a UE to determine subframe/symbol timing and a physical layer identity.
  • a secondary synchronization signal is used by a UE to determine a physical layer cell identity group number and radio frame timing. Based on the physical layer identity and the physical layer cell identity group number, the UE can determine a PCI. Based on the PCI, the UE can determine the locations of the aforementioned DL-RS.
  • the physical broadcast channel (PBCH) which carries an MIB, may be logically grouped with the PSS and SSS to form an SSB (also referred to as an SS/PBCH) .
  • the MIB provides a number of RBs in the downlink system bandwidth and a system frame number (SFN) .
  • the physical downlink shared channel (PDSCH) carries user data, broadcast system information not transmitted through the PBCH, such as system information blocks (SIBs) , and paging messages.
  • SIBs system information blocks
  • the physical downlink control channel carries downlink control information (DCI) within one or more control channel elements (CCEs) , each CCE including one or more RE group (REG) bundles (which may span multiple symbols in the time domain) , each REG bundle including one or more REGs, each REG corresponding to 12 resource elements (one resource block) in the frequency domain and one OFDM symbol in the time domain.
  • DCI downlink control information
  • CCEs control channel elements
  • REG bundles which may span multiple symbols in the time domain
  • each REG bundle including one or more REGs
  • CORESET control resource set
  • a PDCCH is confined to a single CORESET and is transmitted with its own DMRS. This enables UE-specific beamforming for the PDCCH.
  • the CORESET spans three symbols in the time domain.
  • PDCCH channels are localized to a specific region in the frequency domain (i.e., a CORESET) .
  • the frequency component of the PDCCH shown in FIG. 4B is illustrated as less than a single BWP in the frequency domain. Note that although the illustrated CORESET is contiguous in the frequency domain, it need not be. In addition, the CORESET may span less than three symbols in the time domain.
  • the DCI within the PDCCH carries information about uplink resource allocation (persistent and non-persistent) and descriptions about downlink data transmitted to the UE.
  • Multiple (e.g., up to eight) DCIs can be configured in the PDCCH, and these DCIs can have one of multiple formats. For example, there are different DCI formats for uplink scheduling, for non-MIMO downlink scheduling, for MIMO downlink scheduling, and for uplink power control.
  • a PDCCH may be transported by 1, 2, 4, 8, or 16 CCEs in order to accommodate different DCI payload sizes or coding rates.
  • a REG bundle consists of L B consecutive REGs, where L B is the REG bundle size, and can, in NR, be ‘2, ’ ‘3, ’ or ‘6, ’ configured per CORESET.
  • a REG bundle is the smallest physical resource unit that can be allocated to a PDCCH.
  • a CCE generally corresponds to the physical resources of six REGs.
  • a PDCCH is assigned with a number L consecutive CCEs, where L is known as the “aggregation level. ”
  • CCEs are defined in the virtual resource domain.
  • a CCE in the virtual resource domain is mapped to one or more REG bundles in the physical resource domain by a CCE-to-REG mapping function. The function realizes distributive or sequential mapping.
  • a CCE may be mapped to three, two, or one REG bundle (s) corresponding to a REG bundle size of ‘2, ’ ‘3, ’ or ‘6. ’
  • the procedure for allocating PDCCH resources is to first assign continuously numbered CCEs in the virtual resource domain to the PDCCH. Next, the assigned CCEs are mapped to REG bundles in the physical time and frequency resource grid.
  • the DMRS associated with a PDCCH can be transmitted in narrowband (NB) or wideband (WB) mode; the configuration is per CORESET.
  • PDCCH DMRS are transmitted in the whole segment of contiguous RBs allocated to the CORESET if at least one REG bundle of the PDCCH is transmitted in the segment.
  • the same precoder is used in the segment of contiguous RBs, and the RRC configuration parameter precoderGranularity is set to the value of allContiguousRBs.
  • PDCCH DMRS are transmitted in one or more REG bundles constituting the PDCCH.
  • the same precoder is used in each REG bundle of the PDCCH, and the RRC configuration parameter precoderGranularity is set to the value of sameAsREG-bundle.
  • PDCCH DMRS may be bundled together in the time domain. Specifically, if a DMRS is coherently transmitted over different time instants (e.g., slots) , then at the receiver (e.g., a UE) , the DMRS over the different time instants can be jointly processed (e.g., coherently filtered) to enhance the accuracy of channel estimation. This allows for enhanced coverage, high mobility, and low DMRS overhead and peak throughput.
  • the PDCCH DMRS in three consecutive slots are bundled together. Each slot may include one or more PDCCH DMRS, and there may be the same or different numbers of PDCCH DMRS in each slot of a bundle.
  • FIG. 5 is a diagram 500 of conventional groupings of slots containing PDCCH DMRS. Specifically, FIG. 5 illustrates two bundles of slots, each bundle including three slots. There may be one or more PDCCH DMRS in each slot of a bundle. As will be appreciated, although FIG. 5 only illustrates two bundles, the repetition of bundles of three slots can continue indefinitely.
  • a UE For channels with fast time and/or frequency variation properties, to ensure higher reliability, a UE needs to decode multiple bundling slot numbers to demodulate the PDCCH DMRS, which results in higher processing complexity and lacks flexibility. More specifically, the UE needs to process more DMRS in a single slot, which leads to greater processing complexity.
  • RRC signaling can be used to enable DCI-guided (i.e., triggered) PDCCH DMRS reception bundling.
  • a one-bit field referred to herein as PDCCH_DMRS DCI_trigger , can be added to the RRC signaling transmitted by the base station transmitting the PDCCH DMRS.
  • PDCCH_DMRS DCI_trigger can be added to the RRC signaling transmitted by the base station transmitting the PDCCH DMRS.
  • this field/bit is present, or set to, for example, ‘1, ’ it can signal the activation of the disclosed DCI-triggered PDCCH DMRS bundling mode.
  • a one-bit field referred to herein as a “bundling indicator” is added to the DCI to dynamically trigger a new PDCCH DMRS bundle (or “bundling set” ) . That is, the bundling indicator indicates (triggers) the end of the current bundle and the start of a new bundle (the “bundling boundary” ) .
  • the bundling indicator bit is not always present. If the bit is present in the DCI, it indicates that a new PDCCH DMRS bundling set begins in the next slot. As a second option, the bundling indicator bit is always present in the DCI in a slot. If the value of the bit in the current slot is different from the value of the bit in the previous slot, it indicates that a new PDCCH DMRS bundling set begins in the next slot. If the value of the bit is the same as the value of the bit in the previous slot, then the UE continues the current bundling.
  • FIG. 6 is a diagram 600 illustrating the first option described above.
  • the DCI bundling indicator is present in the first slot illustrated ( “Slot #0” ) , indicating that a new PDCCH DMRS bundling set (i.e., bundle) is to begin in the next slot.
  • the DCI bundling indicator is then not present in the next two slots ( “Slot #1” and “Slot #2” ) , but is present again in the fourth slot ( “Slot #3” ) .
  • the first bundle in the example of FIG. 6 consists of three slots, “Slot #1, ” “Slot #2, ” and “Slot #3.
  • the DCI bundling indicator being present in “Slot #3” indicates that a new PDCCH DMRS bundling set is to begin in the next slot ( “Slot #4” ) .
  • the DCI bundling indicator is then not present in “Slot #4, ” but is present again in the next slot ( “Slot #5” ) .
  • the second bundle in the example of FIG. 6 consists of two slots, “Slot #4” and “Slot #5. ”
  • FIG. 7 is a diagram 700 illustrating the second option described above.
  • the DCI bundling indicator is set to ‘1’ in the first slot ( “Slot #0” ) of a first bundle, and changes to ‘0’ in the next slot ( “Slot #1” ) of the first bundle, indicating that a new PDCCH DMRS bundling set (i.e., bundle) is to begin in the next slot.
  • the DCI bundling indicator is set to ‘1’ in the first slot ( “Slot #0” ) of a first bundle, and changes to ‘0’ in the next slot ( “Slot #1” ) of the first bundle, indicating that a new PDCCH DMRS bundling set (i.e., bundle) is to begin in the next slot.
  • bundle i.e., bundle
  • the DCI bundling indicator remains ‘0’ in the first two slots ( “Slot #2” and “Slot #3” ) of the second bundle, then changes to ‘1’ in the third slot ( “Slot #4” ) , indicating that a new PDCCH DMRS bundling set (i.e., bundle) is to begin in the next slot.
  • the first bundle illustrated in FIG. 7 consists of two slots, “Slot #0” and “Slot #1, ” and the second bundle consists of three slots, “Slot #2, ” “Slot #3, ” and “Slot #4. ”
  • the triggering of PDCCH DMRS bundling sets illustrated in FIGS. 7 and 8 can continue indefinitely, so long as a UE is receiving PDCCH DMRS from a base station (e.g., so long as the UE is connected to the base station) , or until the base station signals an end to the DCI-triggered PDCCH DMRS bundling mode.
  • FIGS. 7 and 8 illustrate bundles of two and three slots, as will be appreciated, bundles may be any length, including only one slot and greater than three slots.
  • the DCI-triggered PDCCH DMRS bundling described herein can reduce the UE’s processing complexity and provide flexibility. For example, for a high-end, or premium, UE with sufficient processing capability, a base station can configure a UE with a longer bundling duration (i.e., larger bundling sets) to enhance the UE’s channel estimation performance. However, for low-tier UEs, the base station two short bundling durations may be sufficient for channel estimation.
  • FIG. 8 illustrates an exemplary method 800 of wireless communication, according to aspects of the disclosure.
  • the method 800 may be performed by a UE (e.g., any of the UEs described herein) .
  • the UE receives, from a base station (e.g., any of the base stations described herein) in a first time interval (e.g., a slot or subframe) , a first trigger (e.g., a one-bit DCI field) indicating that a next time interval after the first time interval is a start of a first bundle of time intervals containing PDCCH DMRS.
  • a first trigger e.g., a one-bit DCI field
  • operation 810 may be performed by WWAN transceiver 310, processing system 332, memory 340, and/or PDCCH DMRS measurement component 342, any or all of which may be considered means for performing this operation.
  • the UE measures PDCCH DMRS in each time interval after the first time interval until a second trigger is received from the base station in a second time interval, the second trigger indicating that a next time interval after the second time interval is a start of a second bundle of time intervals containing PDCCH DMRS.
  • operation 810 may be performed by WWAN transceiver 310, processing system 332, memory 340, and/or PDCCH DMRS measurement component 342, any or all of which may be considered means for performing this operation.
  • FIG. 9 illustrates an exemplary method 900 of wireless communication, according to aspects of the disclosure.
  • the method 900 may be performed by a base station (e.g., any of the base stations described herein) .
  • the base station transmits, to a UE (e.g., any of the UEs described herein) in a first time interval (e.g., a slot or subframe) , a first trigger (e.g., a one-bit DCI field) indicating that a next time interval after the first time interval is a start of a first bundle of time intervals containing PDCCH DMRS.
  • a first trigger e.g., a one-bit DCI field
  • operation 910 may be performed by WWAN transceiver 350, processing system 384, memory 386, and/or PDCCH DMRS measurement component 388, any or all of which may be considered means for performing this operation.
  • the base station transmits, to the UE in a second time interval, a second trigger indicating that a next time interval after the second time interval is a start of a second bundle of time intervals containing PDCCH DMRS.
  • the UE is expected to measure PDCCH DMRS from the base station in each time interval after the first time interval until the second trigger.
  • operation 910 may be performed by WWAN transceiver 350, processing system 384, memory 386, and/or PDCCH DMRS measurement component 388, any or all of which may be considered means for performing this operation.
  • a general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
  • a software module may reside in random access memory (RAM) , flash memory, read-only memory (ROM) , erasable programmable ROM (EPROM) , electrically erasable programmable ROM (EEPROM) , registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
  • An exemplary storage medium is coupled to the processor such that the processor can read information from, and write information to, the storage medium.
  • the storage medium may be integral to the processor.
  • the processor and the storage medium may reside in an ASIC.
  • the ASIC may reside in a user terminal (e.g., UE) .
  • the processor and the storage medium may reside as discrete components in a user terminal.
  • the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium.
  • Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • a storage media may be any available media that can be accessed by a computer.
  • such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.
  • any connection is properly termed a computer-readable medium.
  • the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) , or wireless technologies such as infrared, radio, and microwave
  • the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium.
  • Disk and disc includes compact disc (CD) , laser disc, optical disc, digital versatile disc (DVD) , floppy disk and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

Abstract

La divulgation concerne des techniques pour la communication sans fil. Selon un aspect, un équipement utilisateur (UE) reçoit, à partir d'une station de base dans un premier intervalle de temps, un premier déclencheur indiquant qu'un intervalle de temps suivant le premier intervalle de temps est un début d'un premier faisceau d'intervalles de temps contenant des signaux de référence de démodulation (DMRS) de canal de commande de liaison descendante physique (PDCCH), et mesure les DMRS de PDCCH dans chaque intervalle de temps après le premier intervalle de temps jusqu'à ce qu'un second déclencheur soit reçu en provenance de la station de base dans un second intervalle de temps, le second déclencheur indiquant qu'un intervalle de temps suivant le second intervalle de temps est un début d'un second faisceau d'intervalles de temps contenant des DMRS de PDCCH.
PCT/CN2020/076225 2020-02-21 2020-02-21 Groupage de réception de dmrs de pdcch guidé par dci WO2021164008A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
PCT/CN2020/076225 WO2021164008A1 (fr) 2020-02-21 2020-02-21 Groupage de réception de dmrs de pdcch guidé par dci
CN202180014789.4A CN115298995A (zh) 2020-02-21 2021-02-19 解调参考信号多时隙绑定指示
US17/759,606 US20230087095A1 (en) 2020-02-21 2021-02-19 Demodulation reference signal multi-slot bundling indication
EP21757240.3A EP4107899A4 (fr) 2020-02-21 2021-02-19 Indication de groupage multi-créneau de signaux de référence de démodulation
PCT/CN2021/076846 WO2021164726A1 (fr) 2020-02-21 2021-02-19 Indication de groupage multi-créneau de signaux de référence de démodulation

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PCT/CN2020/076225 WO2021164008A1 (fr) 2020-02-21 2020-02-21 Groupage de réception de dmrs de pdcch guidé par dci

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WO2018129157A1 (fr) * 2017-01-06 2018-07-12 Sharp Laboratories Of America, Inc. Équipements utilisateur, stations de base et procédés
US20190222380A1 (en) * 2018-01-12 2019-07-18 Qualcomm Incorporated Demodulation reference signal (dmrs) bundling in slot aggregation and slot format considerations for new radio

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WO2018129157A1 (fr) * 2017-01-06 2018-07-12 Sharp Laboratories Of America, Inc. Équipements utilisateur, stations de base et procédés
US20190222380A1 (en) * 2018-01-12 2019-07-18 Qualcomm Incorporated Demodulation reference signal (dmrs) bundling in slot aggregation and slot format considerations for new radio

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