WO2021223076A1 - Optimisation de puissance d'un canal de commande de liaison descendante physique (pdcch) - Google Patents

Optimisation de puissance d'un canal de commande de liaison descendante physique (pdcch) Download PDF

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Publication number
WO2021223076A1
WO2021223076A1 PCT/CN2020/088656 CN2020088656W WO2021223076A1 WO 2021223076 A1 WO2021223076 A1 WO 2021223076A1 CN 2020088656 W CN2020088656 W CN 2020088656W WO 2021223076 A1 WO2021223076 A1 WO 2021223076A1
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WIPO (PCT)
Prior art keywords
pdcch
series
demodulate
dci format
pdcch candidate
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PCT/CN2020/088656
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English (en)
Inventor
Bing LENG
Haojun WANG
Jianfu ZHANG
Xuesong Chen
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Qualcomm Incorporated
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Priority to PCT/CN2020/088656 priority Critical patent/WO2021223076A1/fr
Publication of WO2021223076A1 publication Critical patent/WO2021223076A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals

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 networks) , a third-generation (3G) high speed data, Internet-capable wireless service and a fourth-generation (4G) service (e.g., LTE or WiMax) .
  • cellular and personal communications service (PCS) 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 communication (GSM) , etc.
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • GSM Global System for Mobile communication
  • a fifth generation (5G) wireless standard also 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 wireless 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 determining whether or not to attempt to demodulate each physical downlink control channel (PDCCH) candidate of a group of PDCCH candidates using a respective downlink control information (DCI) format ‘1’ series before attempting to demodulate PDCCH candidates of the group of PDCCH candidates using a respective DCI format ‘0’ series, and, for each PDCCH candidate of the group of PDCCH candidates: attempting to demodulate the PDCCH candidate using a DCI format ‘1’ series for the PDCCH candidate before attempting to demodulate the PDCCH candidate using a DCI format ‘0’ series for the PDCCH candidate based on a determination to attempt to demodulate each PDCCH candidate of the group of PDCCH candidates using the respective DCI format ‘1’ series before attempting to demodulate PDCCH candidates of the group of PDCCH candidates using the respective DCI format ‘0’ series, or attempting to demodulate the PDCCH candidate using the DCI format ‘
  • 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: determine whether or not to attempt to demodulate each PDCCH candidate of a group of PDCCH candidates using a respective DCI format ‘1’ series before attempting to demodulate PDCCH candidates of the group of PDCCH candidates using a respective DCI format ‘0’ series, and for each PDCCH candidate of the group of PDCCH candidates: attempt to demodulate the PDCCH candidate using a DCI format ‘1’ series for the PDCCH candidate before attempting to demodulate the PDCCH candidate using a DCI format ‘0’ series for the PDCCH candidate based on a determination to attempt to demodulate each PDCCH candidate of the group of PDCCH candidates using the respective DCI format ‘1’ series before attempting to demodulate PDCCH candidates of the group of PDCCH candidates using the respective DCI format ‘0’ series, or attempt
  • a UE includes means for determining whether or not to attempt to demodulate each PDCCH candidate of a group of PDCCH candidates using a respective DCI format ‘1’ series before attempting to demodulate PDCCH candidates of the group of PDCCH candidates using a respective DCI format ‘0’ series, and for each PDCCH candidate of the group of PDCCH candidates: means for attempting to demodulate the PDCCH candidate using a DCI format ‘1’ series for the PDCCH candidate before attempting to demodulate the PDCCH candidate using a DCI format ‘0’ series for the PDCCH candidate based on a determination to attempt to demodulate each PDCCH candidate of the group of PDCCH candidates using the respective DCI format ‘1’ series before attempting to demodulate PDCCH candidates of the group of PDCCH candidates using the respective DCI format ‘0’ series, or means for attempting to demodulate the PDCCH candidate using the DCI format ‘0’ series for the PDCCH candidate before attempting to demodulate the PDCCH candidate before
  • a non-transitory computer-readable medium storing computer-executable instructions includes computer-executable instructions comprising: at least one instruction instructing a UE to determine whether or not to attempt to demodulate each PDCCH candidate of a group of PDCCH candidates using a respective DCI format ‘1’ series before attempting to demodulate PDCCH candidates of the group of PDCCH candidates using a respective DCI format ‘0’ series, and for each PDCCH candidate of the group of PDCCH candidates: at least one instruction instructing the UE to attempt to demodulate the PDCCH candidate using a DCI format ‘1’ series for the PDCCH candidate before attempting to demodulate the PDCCH candidate using a DCI format ‘0’ series for the PDCCH candidate based on a determination to attempt to demodulate each PDCCH candidate of the group of PDCCH candidates using the respective DCI format ‘1’ series before attempting to demodulate PDCCH candidates of the group of PDCCH candidates using the respective DCI format ‘0’ series,
  • FIG. 1 illustrates an exemplary wireless communications system, according to aspects of the disclosure.
  • FIGS. 2A and 2B illustrate example wireless network structures, according to aspects of the disclosure.
  • FIGS. 3A to 3C are simplified block diagrams of several sample aspects of components that may be employed in a UE, a base station, and a network entity, respectively.
  • FIGS. 4A and 4B are diagrams illustrating examples of frame structures and channels within the frame structures, according to aspects of the disclosure.
  • FIG. 5 illustrates pseudocode for monitoring two DCI formats with their configured aggregation levels, according to aspects of the disclosure.
  • FIG. 6 illustrates an exemplary method for demodulating physical downlink channel candidates in a slot, according to aspects of the disclosure.
  • FIG. 7 illustrates an exemplary method for demodulating physical downlink channel candidates in a slot, according to aspects of the disclosure.
  • FIG. 8 illustrates an exemplary method 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 device, ” a “mobile terminal, ” a “mobile station, ” or variations thereof.
  • UEs can communicate with a core network via a RAN, and through the core network the UEs can be connected with external networks such as the Internet and with other UEs.
  • external networks such as the Internet and with other UEs.
  • other mechanisms of connecting to the core network and/or the Internet are also possible for the UEs, such as over wired access networks, wireless local area network (WLAN) networks (e.g., based on IEEE 802.11, etc. ) and so on.
  • WLAN wireless local area network
  • 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 next generation eNB (ng-eNB) , a New Radio (NR) Node B (also referred to as a gNB or gNodeB) , etc.
  • AP access point
  • eNB evolved NodeB
  • ng-eNB next generation eNB
  • NR New Radio
  • a base station may be used primarily to support wireless access by UEs, including supporting data, voice, and/or signaling connections for the supported UEs.
  • 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. ) .
  • 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 (or several cell sectors) of the base station.
  • base station refers to multiple co-located physical TRPs
  • 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) (anetwork of spatially separated antennas connected to a common source via a transport medium) or a remote radio head (RRH) (aremote 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 (or simply “reference 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.
  • a base station may not support wireless access by UEs (e.g., may not support data, voice, and/or signaling connections for UEs) , but may instead transmit reference signals to UEs to be measured by the UEs, and/or may receive and measure signals transmitted by the UEs.
  • a base station may be referred to as a positioning beacon (e.g., when transmitting signals to UEs) and/or as a location measurement unit (e.g., when receiving and measuring signals from UEs) .
  • 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.
  • an RF signal may also be referred to as a “wireless signal” or simply a “signal” where it is clear from the context that the term “signal” refers to a wireless signal or an 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 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 station may include eNBs and/or ng-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 a 5G core (5GC) ) through backhaul links 122, and through the core network 170 to one or more location servers 172 (which may be part of core network 170 or may be external to core network 170) .
  • a core network 170 e.g., an evolved packet core (EPC) or a 5G core (5GC)
  • EPC evolved packet core
  • 5GC 5G 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 /5GC) 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 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) , a cell global identifier (CGI) ) for distinguishing cells operating via the same or a different carrier frequency.
  • PCI physical cell identifier
  • VCI virtual cell identifier
  • CGI cell global 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 of the logical communication entity and the base station that supports it, depending on the context.
  • TRP is typically the physical transmission point of a cell
  • the terms “cell” and “TRP” may be used interchangeably.
  • 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' may have a coverage area 110' that substantially overlaps with the 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 uplink (also referred to as reverse link) transmissions from a UE 104 to a base station 102 and/or downlink (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 downlink and uplink (e.g., more or less carriers may be allocated for downlink than for uplink) .
  • 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. The small cell base station 102', employing LTE /5G in an unlicensed frequency spectrum, may boost coverage to and/or increase capacity of the access network.
  • 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 canceling 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
  • Receive beams may be spatially related.
  • a spatial relation means that parameters for a transmit beam for a second reference signal can be derived from information about a receive beam for a first reference signal.
  • a UE may use a particular receive beam to receive one or more reference downlink reference signals (e.g., positioning reference signals (PRS) , navigation reference signals (NRS) , tracking reference signals (TRS) , phase tracking reference signal (PTRS) , cell-specific reference signals (CRS) , channel state information reference signals (CSI-RS) , primary synchronization signals (PSS) , secondary synchronization signals (SSS) , synchronization signal blocks (SSBs) , etc. ) from a base station.
  • reference downlink reference signals e.g., positioning reference signals (PRS) , navigation reference signals (NRS) , tracking reference signals (TRS) , phase tracking reference signal (PTRS) , cell-specific reference signals (CRS) , channel state information reference signals (CSI-RS) , primary
  • the UE can then form a transmit beam for sending one or more uplink reference signals (e.g., uplink positioning reference signals (UL-PRS) , sounding reference signal (SRS) , demodulation reference signals (DMRS) , PTRS, etc. ) to that base station based on the parameters of the receive beam.
  • uplink reference signals e.g., uplink positioning reference signals (UL-PRS) , sounding reference signal (SRS) , demodulation reference signals (DMRS) , PTRS, etc.
  • positioning reference signal and “PRS” may sometimes refer to specific reference signals that are used for positioning in LTE systems.
  • the terms “positioning reference signal” and “PRS” refer to any type of reference signal that can be used for positioning, such as but not limited to, PRS in LTE, NRS in 5G, TRS, PTRS, CRS, CSI-RS, DMRS, PSS, SSS, SSB, SRS, UL-PRS, etc.
  • positioning reference signal and “PRS” refer to downlink or uplink positioning reference signals, unless otherwise indicated.
  • a downlink positioning reference signal may be referred to as a “DL-PRS, ” and an uplink positioning reference signal (e.g., an SRS-for-positioning, PTRS) may be referred to as an “UL-PRS. ”
  • an uplink positioning reference signal e.g., an SRS-for-positioning, PTRS
  • PTRS SRS-for-positioning
  • the signals may be prepended with “UL” or “DL” to distinguish the direction.
  • UL-DMRS may be differentiated from “DL-DMRS. ”
  • 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 example wireless network structure 200.
  • a 5GC 210 also referred to as a Next Generation Core (NGC)
  • control plane functions 214 e.g., UE registration, authentication, network access, gateway selection, etc.
  • user plane functions 212 e.g., UE gateway function, access to data networks, IP routing, etc.
  • User plane interface (NG-U) 213 and control plane interface (NG-C) 215 connect the gNB 222 to the 5GC 210 and specifically to the control plane functions 214 and user plane functions 212.
  • an ng-eNB 224 may also be connected to the 5GC 210 via NG-C 215 to the control plane functions 214 and NG-U 213 to user plane functions 212. Further, ng-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 ng-eNBs 224 and gNBs 222. Either gNB 222 or ng-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 5GC 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, 5GC 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 example wireless network structure 250.
  • a 5GC 260 can be viewed functionally as control plane functions, provided by an access and mobility management function (AMF) 264, and user plane functions, provided by a user plane function (UPF) 262, which operate cooperatively to form the core network (i.e., 5GC 260) .
  • User plane interface 263 and control plane interface 265 connect the ng-eNB 224 to the 5GC 260 and specifically to UPF 262 and AMF 264, respectively.
  • a gNB 222 may also be connected to the 5GC 260 via control plane interface 265 to AMF 264 and user plane interface 263 to UPF 262.
  • ng-eNB 224 may directly communicate with gNB 222 via the backhaul connection 223, with or without gNB direct connectivity to the 5GC 260.
  • the New RAN 220 may only have one or more gNBs 222, while other configurations include one or more of both ng-eNBs 224 and gNBs 222.
  • Either gNB 222 or ng-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 264 over the N2 interface and with the UPF 262 over the N3 interface.
  • the functions of the AMF 264 include registration management, connection management, reachability management, mobility management, lawful interception, transport for session management (SM) messages between the UE 204 and a session management function (SMF) 266, 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 264 also interacts with an 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 264 retrieves the security material from the AUSF.
  • the functions of the AMF 264 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 264 also includes location services management for regulatory services, transport for location services messages between the UE 204 and a location management function (LMF) 270 (which acts as a location server 230) , transport for location services messages 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.
  • LMF location management function
  • EPS evolved packet system
  • the AMF 264 also supports functionalities for non-3GPP access networks.
  • Functions of the UPF 262 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 a 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., uplink/downlink rate enforcement, reflective QoS marking in the downlink) , uplink traffic verification (service data flow (SDF) to QoS flow mapping) , transport level packet marking in the uplink and downlink, downlink packet buffering and downlink data notification triggering, and sending and forwarding of one or more “end markers” to the source RAN node.
  • the UPF 262 may also support transfer of location services messages over a user plane between the UE 204 and a location server, such as a secure user plane location (SUPL)
  • the functions of the SMF 266 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 262 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 266 communicates with the AMF 264 is referred to as the N11 interface.
  • LMF 270 may be in communication with the 5GC 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, 5GC 260, and/or via the Internet (not illustrated) .
  • the SLP 272 may support similar functions to the LMF 270, but whereas the LMF 270 may communicate with the AMF 264, New RAN 220, and UEs 204 over a control plane (e.g., using interfaces and protocols intended to convey signaling messages and not voice or data) , the SLP 272 may communicate with UEs 204 and external clients (not shown in FIG. 2B) over a user plane (e.g., using protocols intended to carry voice and/or data like the transmission control protocol (TCP) and/or IP) .
  • TCP transmission control protocol
  • 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, the LMF 270, and the SLP 272) 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., ng-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, positioning operations, and for providing other processing functionality.
  • the base station 304 includes a processing system 384 for providing functionality relating to, for example, positioning operations 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, positioning operations 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 demodulation components 342, 388, and 398, respectively.
  • the PDCCH demodulation 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 demodulation 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 demodulation 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 uplink 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 downlink frame structure, according to aspects of the disclosure.
  • FIG. 4B is a diagram 430 illustrating an example of channels within the downlink frame structure, according to aspects of the disclosure.
  • Other wireless communications technologies may have 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 milliseconds (ms)
  • ms milliseconds
  • 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 REs may carry downlink reference (pilot) signals (DL-RS) .
  • the DL-RS may include PRS in LTE, NRS in 5G, TRS, PTRS, CRS, CSI-RS, DMRS, PSS, SSS, SSB, etc.
  • FIG. 4A illustrates exemplary locations of REs carrying DL-RS (labeled “R” ) , such as DL-PRS with a comb-6 PRS resource configuration.
  • 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 block) .
  • 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, referred to as uplink and downlink grants, respectively. More specifically, the DCI indicates the resources scheduled for the downlink data channel (e.g., PDSCH) and the uplink data channel (e.g., PUSCH) . 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 downlink scheduling, for uplink transmit power control (TPC) , etc., as shown in Table 2 below.
  • 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 fallback format is a default scheduling option that has non-configurable fields and supports basic NR operations.
  • a non-fallback format is flexible to accommodate NR features.
  • a UE needs to be able to demodulate (also referred to as decoding) the PDCCH in order to read the DCI, and thereby to obtain the scheduling of resources allocated to the UE on the PDSCH and PUSCH. If the UE fails to demodulate the PDCCH, then the UE will not know the locations of the PDSCH resources and it will keep attempting to demodulate the PDCCH using a different set of PDCCH candidates in subsequent PDCCH monitoring occasions. If the UE fails to demodulate the PDCCH after some number of attempts, the UE declares a radio link failure (RLF) .
  • RLF radio link failure
  • a UE does not attempt to demodulate each and very PDCCH candidate that may be scheduled in a slot.
  • search spaces are configured. Search spaces are indicated by a set of contiguous CCEs that the UE is supposed to monitor for scheduling assignments/grants relating to a certain component carrier. There are two types of search spaces used for the PDCCH to control each component carrier, a common search space (CSS) and a UE-specific search space (USS) .
  • SCS common search space
  • USS UE-specific search space
  • a common search space is shared across all UEs, and a UE-specific search space is used per UE (i.e., a UE-specific search space is specific to a specific UE) .
  • a DCI cyclic redundancy check is scrambled with a system information radio network temporary identifier (SI-RNTI) , random access RNTI (RA-RNTI) , temporary cell RNTI (TC-RNTI) , paging RNTI (P-RNTI) , interruption RNTI (INT-RNTI) , slot format indication RNTI (SFI-RNTI) , TPC-PUCCH-RNTI, TPC-PUSCH-RNTI, TPC-SRS-RNTI, cell RNTI (C-RNTI) , or configured scheduling RNTI (CS-RNTI) for all common procedures.
  • SI-RNTI system information radio network temporary identifier
  • RA-RNTI random access RNTI
  • TC-RNTI temporary cell RNTI
  • a UE demodulates the PDCCH using the four UE-specific search space aggregation levels (1, 2, 4, and 8) and the two common search space aggregation levels (4 and 8) , as shown in Table 3 below.
  • Each search space comprises a group of consecutive CCEs that could be allocated to a PDCCH, referred to as a PDCCH candidate.
  • a UE demodulates all of the PDCCH candidates in these two search spaces (USS and CSS) to discover the DCI for that UE. For example, the UE may demodulate the DCI to obtain the scheduled uplink grant information on the PUSCH and the downlink resources on the PDSCH.
  • the aggregation level is the number of REs of a CORESET that carry a PDCCH DCI message, and is expressed in terms of CCEs. There is a one-to-one mapping between the aggregation level and the number of CCEs per aggregation level.
  • a UE For both the UE-specific and common search spaces, a UE needs to monitor at least two DCI formats with their configured aggregation levels, as shown by the pseudocode 500 illustrated in FIG. 5.
  • a UE may receive the pseudocode 500 in RRC signaling (e.g., an RRC header) .
  • the pseudocode 500 identifies the search space, here, a UE-specific search space (as shown by the parameter “searchSpaceType” having the value “ue-specific” ) .
  • the pseudocode 500 configures the UE with aggregation level ‘4, ’ as shown by the parameter “aggregationLevel4” having a value of “n2.
  • the remaining aggregation levels are set to ‘0, ’ as shown by the remaining aggregation levels having a value of “n0. ” Because the aggregation level is ‘4’ and the search space is a UE-specific search space, there are two PDCCH candidates per slot that the UE is expected to demodulate (see the third row of Table 3) .
  • the pseudocode 500 also configures the UE with two DCI formats, specifically, DCI formats 0-1 and 1-1, as shown by the parameter “dci-Formats” having the value “formats0-1-And-1-1. ” This means that the UE is expected to use these two DCI formats when attempting to demodulate each of the two PDCCH candidates. As such, there are four hypotheses for demodulating the two PDCCH candidates. As shown in FIG. 5, the pseudocode 500, and all RRC headers, lists DCI format ‘0’ series (e.g., DCI format 0-1) first and DCI format ‘1’ series (e.g., DCI format 1-1) last.
  • DCI format ‘0’ series e.g., DCI format 0-1
  • DCI format ‘1’ series e.g., DCI format 1-1
  • the demodulation sequence at the UE is as follows: attempt to demodulate (1) PDCCH candidate ‘1’ using DCI-format 0-1, (2) PDCCH candidate ‘1’ using DCI-format 1-1, (3) PDCCH candidate ‘2’ using DCI-format 0-1, and (4) PDCCH candidate ‘2’ using DCI-format 1-1.
  • the network e.g., location server, serving base station assigns more downlink-related grants (DCI format ‘1’ series) than uplink-related grants (DCI format ‘0’ series) .
  • DCI format ‘1’ series downlink-related grants
  • uplink-related grants DCI format ‘0’ series
  • FTP file transfer protocol
  • the present disclosure provides techniques for a UE to choose whether or not to attempt to demodulate a PDCCH candidate using a DCI format ‘1’ series first, rather than a DCI format ‘0’ series. If a UE successfully demodulates a PDCCH candidate using a DCI format ‘1’ series, the UE can skip demodulation of the same PDCCH candidate using other DCI formats. In this way, the demodulation time for each PDCCH candidate will be reduced and the power consumed for demodulation will be decreased.
  • FIG. 6 illustrates an exemplary method 600 for demodulating PDCCH candidates in a slot, according to aspects of the disclosure.
  • there are two PDCCH candidates 602 and 612 (labeled as “PDCCH candidate 1” and “PDCCH candidate 2” ) in a slot, as in the case of aggregation levels ‘4’ and ‘8’ for a UE-specific search space and aggregation level ‘8’ for a common search space (see Table 3) .
  • there may be more than two PDCCH candidates per slot as is the case for other aggregation levels.
  • the UE attempts to demodulate the PDCCH candidate 602 using the DCI format ‘1’ series specified in a received RRC header (e.g., DCI format 1-1 in pseudocode 500) . If the DCI format ‘1’ series demodulation at 604 fails, then at 606, the UE attempts to demodulate the PDCCH candidate 602 using the DCI format ‘0’ series specified in the received RRC header (e.g., DCI format 0-1 in pseudocode 500) .
  • method 600 skips to 608, where the UE finishes demodulating the PDCCH candidate 602 using the specified DCI format ‘1’ series.
  • the UE successfully demodulates the PDCCH candidate 602 using the specified DCI format ‘0’ series at 606 then at 608, the UE finishes demodulating the PDCCH candidate 602 using the specified DCI format ‘0’ series.
  • the UE attempts to demodulate the PDCCH candidate 612 using the DCI format ‘1’ series specified in the received RRC header (e.g., DCI format 1-1 in pseudocode 500) . If the DCI format ‘1’ series demodulation at 614 fails, then at 616, the UE attempts to demodulate the PDCCH candidate 612 using the DCI format ‘0’ series specified in the received RRC header (e.g., DCI format 0-1 in pseudocode 500) .
  • method 600 skips to 608, where the UE finishes demodulating the PDCCH candidate 612 using the specified DCI format ‘1’ series.
  • the UE successfully demodulates the PDCCH candidate 612 using the specified DCI format ‘0’ series at 616 then at 618, the UE finishes demodulating the PDCCH candidate 612 using the specified DCI format ‘0’ series.
  • FIG. 7 illustrates an exemplary method 700 for demodulating PDCCH candidates in a slot, according to aspects of the disclosure.
  • a monitoring cycle is defined.
  • the monitoring cycle is used to update the minimum cycle used to change the PDCCH DCI format demodulation order (i.e., demodulate a PDCCH candidate using a DCI format ‘1’ or ‘0’ series first) .
  • the monitoring cycle may be ‘M’ times the value of the monitoringSlotPeriodicityAndOffset IE (specified in 3GPP technical specification (TS) 38.331) .
  • the variable ‘M’ can be an integer larger than ‘1’ but smaller than, for example, 40 slots.
  • a monitoring cycle includes all PDCCH candidates within some number of slots (e.g., one to 40) , and the UE will apply the same demodulation order (e.g., DCI format ‘1’ series first, then DCI format ‘0’ series) to all of the PDCCH candidates in that monitoring cycle.
  • the same demodulation order e.g., DCI format ‘1’ series first, then DCI format ‘0’ series
  • the UE can choose to use the disclosed method (i.e., attempt to demodulate using a DCI format ‘1’ series first) to minimize the PDCCH demodulation power and proceed to 706. Otherwise, the UE can choose to follow the legacy method (i.e., attempt to demodulate using a DCI format ‘0’ series first) and proceed to 704.
  • the disclosed method i.e., attempt to demodulate using a DCI format ‘1’ series first
  • the legacy method i.e., attempt to demodulate using a DCI format ‘0’ series first
  • the determination of whether or not there is a “small” amount of uplink data to transmit in the UE’s MAC data buffer may be determined using some threshold, such that if the amount of uplink data to transmit is less than the threshold, the UE uses the disclosed method, and if the amount of uplink data to transmit is greater than the threshold, the UE uses the legacy method.
  • some threshold such that if the amount of uplink data to transmit is less than the threshold, the UE uses the disclosed method, and if the amount of uplink data to transmit is greater than the threshold, the UE uses the legacy method.
  • the UE checks the DCI format it needs to monitor for those PDCCH candidates. That is, the UE checks the DCI formats that are to be used to demodulate each PDCCH candidate.
  • the DCI formats may be received in an RRC header, as described above with reference to FIG. 5.
  • the UE attempts to demodulate the PDCCH candidate using the DCI format ‘1’ series first. If the demodulation is successful, the UE proceeds to 712, skipping 710. However, if the UE fails to demodulate the PDCCH candidate using the DCI format ‘1’ series for this PDCCH candidate, then at 710, the UE attempts to demodulate the PDCCH candidate using the received DCI format ‘0’ series, and/or any other DCI format series.
  • the other DCI format series may also have been received in an RRC header.
  • the UE determines whether all of the PDCCH candidates have been demodulated for the current monitoring cycle. If they have been, then the UE returns to 702 for the next monitoring cycle and checks the amount of uplink data in its MAC data buffer. Otherwise, the method 700 returns to 706 to process the next PDCCH candidate.
  • a UE can reduce PDCCH demodulation power by attempting to demodulate the PDCCH candidates in a monitoring cycle using the DCI format series ( ‘0’ or ‘1’ ) that is more likely to be the DCI format series needed for a majority of the PDCCH candidates.
  • FIG. 8 illustrates an exemplary method 800 of wireless communication, according to aspects of the disclosure.
  • the method 800 may be performed by any of the UEs described herein.
  • the UE determines whether or not to attempt to demodulate each PDCCH candidate of a group of PDCCH candidates using a respective DCI format ‘1’ series before attempting to demodulate PDCCH candidates of the group of PDCCH candidates using a respective DCI format ‘0’ series, as, for example, at 702 of FIG. 7.
  • operation 810 may be performed by WWAN transceiver 310, processing system 332, memory component 340, and/or PDCCH demodulation component 342, any or all of which may be considered means for performing this operation.
  • the UE attempts, at 822, to demodulate the PDCCH candidate using a DCI format ‘1’ series for the PDCCH candidate before attempting to demodulate the PDCCH candidate using a DCI format ‘0’ series for the PDCCH candidate based on a determination to attempt to demodulate each PDCCH candidate of the group of PDCCH candidates using the respective DCI format ‘1’ series before attempting to demodulate PDCCH candidates of the group of PDCCH candidates using the respective DCI format ‘0’ series, as, for example, at 708 of FIG. 7.
  • the UE attempts to demodulate the PDCCH candidate using the DCI format ‘0’ series for the PDCCH candidate before attempting to demodulate the PDCCH candidate using the DCI format ‘1’ series for the PDCCH candidate based on a determination to not attempt to demodulate each PDCCH candidate of the group of PDCCH candidates using the respective DCI format ‘1’ series before attempting to demodulate PDCCH candidates of the group of PDCCH candidates using the respective DCI format ‘0’ series, as, for example, at 704 of FIG. 7.
  • operations 820, 822, and 824 may be performed by WWAN transceiver 310, processing system 332, memory component 340, and/or PDCCH demodulation component 342, 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

L'invention concerne des techniques de communication sans fil. Selon un aspect, un équipement utilisateur (UE) détermine s'il faut ou non tenter de démoduler chaque canal de commande de liaison descendante physique (PDCCH) candidat d'un groupe de PDCCH candidats à l'aide d'une série de format « 1 » respective d'informations de commande de liaison descendante (DCI) avant de tenter de démoduler les PDCCH candidats du groupe de PDCCH candidats à l'aide d'une série « 0 » respective de format DCI. L'UE démodule ensuite chaque PDCCH candidat du groupe de PDCCH candidats d'après la détermination.
PCT/CN2020/088656 2020-05-06 2020-05-06 Optimisation de puissance d'un canal de commande de liaison descendante physique (pdcch) WO2021223076A1 (fr)

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CN103188029A (zh) * 2011-12-27 2013-07-03 夏普株式会社 一种对控制信道的控制指示符进行译码的方法和用户设备
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