WO2021062209A1 - Répétition de pucch avant établissement de connexion rrc - Google Patents

Répétition de pucch avant établissement de connexion rrc Download PDF

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Publication number
WO2021062209A1
WO2021062209A1 PCT/US2020/052799 US2020052799W WO2021062209A1 WO 2021062209 A1 WO2021062209 A1 WO 2021062209A1 US 2020052799 W US2020052799 W US 2020052799W WO 2021062209 A1 WO2021062209 A1 WO 2021062209A1
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WIPO (PCT)
Prior art keywords
pucch transmission
pucch
repetition
transmission
slot
Prior art date
Application number
PCT/US2020/052799
Other languages
English (en)
Inventor
Wei Yang
Hung Dinh LY
Yi Huang
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.)
Filing date
Publication date
Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Publication of WO2021062209A1 publication Critical patent/WO2021062209A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1858—Transmission or retransmission of more than one copy of acknowledgement message
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1861—Physical mapping arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1896—ARQ related signaling
    • 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
    • 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
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated

Definitions

  • the apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory.
  • the instructions may be executable by the processor to cause the apparatus to determine a Physical Uplink Control Channel (PUCCH) resource for a PUCCH transmission prior to receiving a dedicated PUCCH resource configuration, determine a repetition level for the PUCCH transmission, and transmit the PUCCH transmission, on at least the PUCCH resource, according to the repetition level.
  • PUCCH Physical Uplink Control Channel
  • the transmitting the PUCCH transmission comprises performing intra-slot repetition or inter-slot repetition of the PUCCH transmission based on a number of Orthogonal Frequency Division Multiplexing (OFDM) symbols of the PUCCH transmission or a location of a first OFDM symbol of the PUCCH transmission.
  • OFDM Orthogonal Frequency Division Multiplexing
  • inter-slot repetition is performed if the number of OFDM symbols of the PUCCH transmission is above a threshold and intra-slot repetition is performed if the number OFDM symbols of the PUCCH transmission is below the threshold.
  • performing the intra-slot repetition includes transmitting at least one repetition of the PUCCH transmission prior to transmitting the PUCCH transmission on the PUCCH resource.
  • the apparatus may include a processor, a memory in electronic communication with the processor, and instructions stored in the memory.
  • the instructions may be executable by the processor to cause the apparatus to transmit, to a user equipment (UE), information scheduling a Physical Uplink Control Channel (PUCCH) transmission on a PUCCH resource prior to configuring dedicated PUCCH resources for the UE, determine a repetition level for the PUCCH transmission, transmit, to the UE, an indication of the repetition level, and receive, according to the repetition level, a first repetition of the PUCCH transmission on the PUCCH resource and other repetitions of the PUCCH transmission.
  • UE user equipment
  • PUCCH Physical Uplink Control Channel
  • FIG. 5 illustrates an example slot structure depicting frequency hopping patterns for uplink control repetition enhancements in accordance with various aspects of the present disclosure.
  • 3GPP 3rd Generation Partnership Project
  • 3GPP Long Term Evolution LTE
  • UMTS universal mobile telecommunications system
  • the 3GPP may define specifications for the next generation of mobile networks, mobile systems, and mobile devices.
  • the present disclosure is concerned with the evolution of wireless technologies from LTE, 4G, 5G, and beyond with shared access to wireless spectrum between networks using a collection of new and different radio access technologies or radio air interfaces.
  • Base stations 105 may wirelessly communicate with UEs 115 via one or more base station antennas.
  • Base stations 105 described herein may include or may be referred to by those skilled in the art as a base transceiver station, a radio base station, an access point, a radio transceiver, a NodeB, an eNodeB (eNB), a next-generation Node B or giga-nodeB (either of which may be referred to as a gNB), a Home NodeB, a Home eNodeB, or some other suitable terminology.
  • Wireless communications system 100 may include base stations 105 of different types (e.g., macro or small cell base stations).
  • the UEs 115 described herein may be able to communicate with various types of base stations 105 and network equipment including macro eNBs, small cell eNBs, gNBs, relay base stations, and the like. Each access network entity may communicate with UEs 115 through a number of other access network transmission entities, which may be referred to as a radio head, a smart radio head, a remote radio head, or a transmission/reception point (TRP).
  • TRP transmission/reception point
  • the functions performed by base stations 105 may be carried out via these network entities (e.g., TRPs). Accordingly, as described herein, the terms TRP, eNB, gNB, and base station may be used interchangeably unless otherwise noted.
  • UEs 115 may be dispersed throughout the wireless communications system 100, and each UE 115 may be stationary or mobile.
  • a UE 115 may also be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, where the “device” may also be referred to as a unit, a station, a terminal, or a client.
  • a UE 115 may also be a personal electronic device such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer.
  • PDA personal digital assistant
  • Some UEs 115 may be low cost or low complexity devices, and may provide for automated communication between machines (e.g., via Machine-to-Machine (M2M) communication).
  • M2M communication or MTC may refer to data communication technologies that allow devices to communicate with one another or a base station 105 without human intervention or with minimal human intervention.
  • M2M communication or MTC may include communications from devices that integrate sensors or meters to measure or capture information and relay that information to a central server or application program that can make use of the information or present the information to humans interacting with the program or application.
  • Some UEs 115 may be designed to collect information or enable automated behavior of machines. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based business charging.
  • Some UEs 115 may be configured to employ operating modes that reduce power consumption, such as half-duplex communications (e.g., a mode that supports one-way communication via transmission or reception, but not transmission and reception simultaneously). In some examples half-duplex communications may be performed at a reduced peak rate. Other power conservation techniques for UEs 115 include entering a power saving “deep sleep” mode when not engaging in active communications, or operating over a limited bandwidth (e.g., according to narrowband communications). In some cases, UEs 115 may be designed to support critical functions (e.g., mission critical functions), and a wireless communications system 100 may be configured to provide ultra-reliable communications for these functions.
  • critical functions e.g., mission critical functions
  • a UE 115 may also be able to communicate directly with other UEs 115 (e.g., using a peer-to-peer (P2P) or device-to-device (D2D) protocol).
  • P2P peer-to-peer
  • D2D device-to-device
  • One or more of a group of UEs 115 utilizing D2D communications may be within the geographic coverage area 110 of a base station 105.
  • Other UEs 115 in such a group may be outside the geographic coverage area 110 of a base station 105, or be otherwise unable to receive transmissions from a base station 105.
  • groups of UEs 115 communicating via D2D communications may utilize a one-to-many (1:M) system in which each UE 115 transmits to every other UE 115 in the group.
  • a base station 105 facilitates the scheduling of resources for D2D communications.
  • D2D communications are carried out between UEs 115 without the involvement of a base station 105.
  • At least some of the network devices may include subcomponents such as an access network entity, which may be an example of an access node controller (ANC).
  • an access network entity may communicate with UEs 115 through a number of other access network transmission entities, which may be referred to as a radio head, a smart radio head, or a transmission/reception point (TRP).
  • TRP transmission/reception point
  • various functions of each access network entity or base station 105 may be distributed across various network devices (e.g., radio heads and access network controllers) or consolidated into a single network device (e.g., a base station 105).
  • Wireless communications system 100 may operate using one or more frequency bands, typically in the range of 300 MHz to 300 GHz.
  • the region from 300 MHz to 3 GHz is known as the ultra-high frequency (UHF) region or decimeter band, since the wavelengths range from approximately one decimeter to one meter in length.
  • UHF waves may be blocked or redirected by buildings and environmental features. However, the waves may penetrate structures sufficiently for a macro cell to provide service to UEs 115 located indoors. Transmission of UHF waves may be associated with smaller antennas and shorter range (e.g., less than 100 km) compared to transmission using the smaller frequencies and longer waves of the high frequency (HF) or very high frequency (VHF) portion of the spectrum below 300 MHz.
  • HF high frequency
  • VHF very high frequency
  • Wireless communications system 100 may also operate in a super high frequency (SHF) region using frequency bands from 3 GHz to 30 GHz, also known as the centimeter band.
  • SHF region includes bands such as the 5 GHz industrial, scientific, and medical (ISM) bands, which may be used opportunistically by devices that can tolerate interference from other users.
  • ISM bands 5 GHz industrial, scientific, and medical bands
  • Operations in unlicensed spectrum may include downlink transmissions, uplink transmissions, peer- to-peer transmissions, or a combination of these.
  • Duplexing in unlicensed spectrum may be based on frequency division duplexing (FDD), time division duplexing (TDD), or a combination of both.
  • FDD frequency division duplexing
  • TDD time division duplexing
  • the antennas of a base station 105 or UE 115 may be located within one or more antennas or antenna arrays, which may support MIMO operations such as spatial multiplexing, or transmit or receive beamforming.
  • one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower.
  • antennas or antenna arrays associated with a base station 105 may be located in diverse geographic locations.
  • a base station 105 may have an antenna array with a number of rows and columns of antenna ports that the base station 105 may use to support beamforming of communications with a UE 115.
  • a UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations.
  • MIMO wireless systems use a transmission scheme between a transmitting device (e.g., a base station 105) and a receiving device (e.g., a UE 115), where both transmitting device and the receiving device are equipped with multiple antennas.
  • a transmitting device e.g., a base station 105
  • a receiving device e.g., a UE 115
  • MIMO communications may employ multipath signal propagation to increase the utilization of a radio frequency spectrum band by transmitting or receiving different signals via different spatial paths, which may be referred to as spatial multiplexing.
  • the different signals may, for example, be transmitted by the transmitting device via different antennas or different combinations of antennas.
  • the different signals may be received by the receiving device via different antennas or different combinations of antennas.
  • Each of the different signals may be referred to as a separate spatial stream, and the different antennas or different combinations of antennas at a given device (e.g., the orthogonal resource of the device associated with the spatial dimension) may be referred to as spatial layers.
  • Beamforming which may also be referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a base station 105 or a UE 115) to shape or steer an antenna beam (e.g., a transmit beam or receive beam) along a direction between the transmitting device and the receiving device.
  • Beamforming may be achieved by combining the signals communicated via antenna elements of an antenna array such that signals propagating at particular orientations with respect to an antenna array experience constructive interference while others experience destructive interference.
  • the adjustment of signals communicated via the antenna elements may include a transmitting device or a receiving device applying certain phase offset, timing advance/delay, or amplitude adjustment to signals carried via each of the antenna elements associated with the device.
  • the adjustments associated with each of the antenna elements may be defined by a beamforming weight set associated with a particular orientation (e.g., with respect to the antenna array of the transmitting device or receiving device, or with respect to some other orientation).
  • a base station 105 may use multiple use antennas or antenna arrays to conduct beamforming operations for directional communications with a UE 115. For instance, signals may be transmitted multiple times in different directions, which may include a signal being transmitted according to different beamforming weight sets associated with different directions of transmission.
  • a receiving device e.g., a UE 115, which may be an example of a mmW receiving device
  • a receiving device may try multiple receive directions by receiving via different antenna subarrays, by processing received signals according to different antenna subarrays, by receiving according to different receive beamforming weight sets applied to signals received at a plurality of antenna elements of an antenna array, or by processing received signals according to different receive beamforming weight sets applied to signals received at a plurality of antenna elements of an antenna array, any of which may be referred to as “listening” according to different receive beams or receive directions.
  • wireless communications system 100 may be a packet-based network that operate according to a layered protocol stack.
  • PDCP Packet Data Convergence Protocol
  • a Radio Link Control (RLC) layer may in some cases perform packet segmentation and reassembly to communicate over logical channels.
  • RLC Radio Link Control
  • a Medium Access Control (MAC) layer may perform priority handling and multiplexing of logical channels into transport channels.
  • the MAC layer may also use hybrid automatic repeat request (HARQ) to provide retransmission at the MAC layer to improve link efficiency.
  • HARQ hybrid automatic repeat request
  • the Radio Resource Control (RRC) protocol layer may provide establishment, configuration, and maintenance of an RRC connection between a UE 115 and a base station 105 or core network 130 supporting radio bearers for user plane data.
  • RRC Radio Resource Control
  • PHY Physical
  • UEs 115 and base stations 105 may support retransmissions of data to increase the likelihood that data is received successfully.
  • HARQ feedback is one technique of increasing the likelihood that data is received correctly over a communication link 125.
  • HARQ may include a combination of error detection (e.g., using a cyclic redundancy check (CRC)), forward error correction (FEC), and retransmission (e.g., automatic repeat request (ARQ)).
  • FEC forward error correction
  • ARQ automatic repeat request
  • HARQ may improve throughput at the MAC layer in poor radio conditions (e.g., signal-to-noise conditions).
  • a wireless device may support same-slot HARQ feedback, where the device may provide HARQ feedback in a specific slot for data received in a previous symbol in the slot. In other cases, the device may provide HARQ feedback in a subsequent slot, or according to some other time interval.
  • HARQ feedback may include transmission of a HARQ-ACK message on PUCCH in response to a contention resolution message (e.g., Msg4 in four-step random access or MsgB in two-step random access).
  • the UE may transmit the HARQ-ACK message in this scenario on PUCCH resources prior to configuration of dedicated PUCCH resources for the UE or prior to completion of RRC connection setup.
  • the radio frames may be identified by a system frame number (SFN) ranging from 0 to 1023.
  • SFN system frame number
  • Each frame may include ten subframes numbered from 0 to 9, and each subframe may have a duration of 1 millisecond.
  • a subframe may be further divided into two slots each having a duration of 0.5 milliseconds, and each slot may contain 6 or 7 modulation symbol periods (e.g., depending on the length of the cyclic prefix prepended to each symbol period). Excluding the cyclic prefix, each symbol period may contain 2048 sampling periods.
  • a subframe may be the smallest scheduling unit of the wireless communications system 100, and may be referred to as a transmission time interval (TTI).
  • TTI transmission time interval
  • a smallest scheduling unit of the wireless communications system 100 may be shorter than a subframe or may be dynamically selected (e.g., in bursts of shortened TTIs (sTTIs) or in selected component carriers using sTTIs).
  • a radio frame may have a duration of 10 ms, and one slot may comprise 14 OFDM symbols, but the number of slots in a 5G NR radio frame may vary due to flexible numerology resulting in a flexible time-slot structure.
  • the numerology for 5G NR may include sub-carrier spacings of 15 kHz, 30 kHz, 60 kHz, or 120 kHz, depending on the system configuration and bandwidth. For example, with increased sub-carrier spacing, the symbol duration decreases while the radio frame duration would remain the same. Accordingly, if the sub-carrier spacing is increased from 15 kHz to 30 kHz, the duration of each slot is halved, resulting in 20 slots within the 10 ms radio frame.
  • a slot may further be divided into multiple mini- slots containing one or more symbols and, in some instances, a symbol of a mini-slot or a mini-slot may be the smallest unit of scheduling.
  • each symbol may vary in duration depending on the subcarrier spacing or frequency band of operation, for example.
  • Some wireless communications systems may implement slot aggregation in which multiple slots or mini-slots may be aggregated together for communication between a UE 115 and a base station 105.
  • a resource element may consist of one symbol period (e.g., a duration of one modulation symbol) and one subcarrier (e.g., a 15 kHz frequency range).
  • a resource block may contain 12 consecutive subcarriers in the frequency domain (e.g., collectively forming a “carrier”) and, for a normal cyclic prefix in each orthogonal frequency- division multiplexing (OFDM) symbol, 7 consecutive OFDM symbol periods in the time domain, or 84 total resource elements across the frequency and time domains.
  • the number of bits carried by each resource element may depend on the modulation scheme (the configuration of modulation symbols that may be applied during each symbol period).
  • a wireless communications resource may refer to a combination of a radio frequency spectrum band resource, a time resource, and a spatial resource (e.g., spatial layers), and the use of multiple spatial layers may further increase the data rate for communications with a UE 115.
  • carrier refers to a set of radio frequency spectrum resources having a defined organizational structure for supporting uplink or downlink communications over a communication link 125.
  • a carrier of a communication link 125 may include a portion of a radio frequency spectrum band that may also be referred to as a frequency channel.
  • a carrier may be made up of multiple sub-carriers (e.g., waveform signals of multiple different frequencies).
  • a carrier may be organized to include multiple physical channels, where each physical channel may carry user data, control information, or other signaling.
  • the organizational structure of the carriers may be different for different radio access technologies (e.g., LTE, LTE-A, NR, etc.). For example, communications over a carrier may be organized according to TTIs or slots, each of which may include user data as well as control information or signaling to support decoding the user data.
  • LTE Long Term Evolution
  • LTE-A Long Term Evolution Advanced
  • NR New Radio
  • a carrier may also include dedicated acquisition signaling (e.g., synchronization signals or system information, etc.) and control signaling that coordinates operation for the carrier.
  • acquisition signaling e.g., synchronization signals or system information, etc.
  • control signaling that coordinates operation for the carrier.
  • a carrier may also have acquisition signaling or control signaling that coordinates operations for other carriers.
  • Physical channels may be multiplexed on a carrier according to various techniques.
  • a physical control channel and a physical data channel may be multiplexed on a downlink carrier, for example, using time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques.
  • TDM time division multiplexing
  • FDM frequency division multiplexing
  • control information transmitted in a physical control channel may be distributed between different control regions in a cascaded manner (e.g., between a common control region or common search space and one or more UE- specific control regions or UE-specific search spaces).
  • a carrier may be associated with a particular bandwidth of the radio frequency spectrum, and in some examples the carrier bandwidth may be referred to as a “system bandwidth” of the carrier or the wireless communications system 100.
  • the carrier bandwidth may be one of a number of predetermined bandwidths for carriers of a particular radio access technology (e.g., 1.4, 3, 5, 10, 15, or 20 MHz for LTE).
  • the carrier bandwidth may range from 5 MHz up to 100 MHz for sub- 6 GHz frequency spectrum, and from 50 MHz up to 400 MHz for mmW frequency spectrum (above 24 GHz frequency spectrum).
  • the system bandwidth may refer to a minimum bandwidth unit for scheduling communications between a base station 105 and a UE 115.
  • a base station 105 or a UE 115 may also support communications over carriers having a smaller bandwidth than the system bandwidth.
  • the system bandwidth may be referred to as “wideband” bandwidth and the smaller bandwidth may be referred to as a “narrowband” bandwidth.
  • wideband communications may be performed according to a 20 MHz carrier bandwidth and narrowband communications may be performed according to a 1.4 MHz carrier bandwidth.
  • Devices of the wireless communications system 100 may have a hardware configuration that supports communications over a particular carrier bandwidth, or may be configurable to support communications over one of a set of carrier bandwidths.
  • base stations 105 or UEs 115 may perform some communications according to a system bandwidth (e.g., wideband communications), and may perform some communications according to a smaller bandwidth (e.g., narrowband communications).
  • the wireless communications system 100 may include base stations 105 and/or UEs that can support simultaneous communications via carriers associated with more than one different bandwidth.
  • Wireless communications system 100 may support communication with a UE 115 on multiple cells or carriers, a feature which may be referred to as carrier aggregation (CA) or multi-carrier operation.
  • a UE 115 may be configured with multiple downlink CCs and one or more uplink CCs according to a carrier aggregation configuration.
  • Carrier aggregation may be used with both FDD and TDD component carriers.
  • wireless communications system 100 may utilize enhanced component carriers (eCCs).
  • eCC may be characterized by one or more features including wider carrier or frequency channel bandwidth, shorter symbol duration, shorter TTI duration, or modified control channel configuration.
  • an eCC may be associated with a carrier aggregation configuration or a dual connectivity configuration (e.g., when multiple serving cells have a suboptimal or non-ideal backhaul link).
  • An eCC may also be configured for use in unlicensed spectrum or shared spectrum (e.g., where more than one operator is allowed to use the spectrum).
  • An eCC characterized by wide carrier bandwidth may include one or more segments that may be utilized by UEs 115 that are not capable of monitoring the whole carrier bandwidth or are otherwise configured to use a limited carrier bandwidth (e.g., to conserve power).
  • an eCC may utilize a different symbol duration than other CCs, which may include use of a reduced symbol duration as compared with symbol durations of the other CCs.
  • a shorter symbol duration may be associated with increased spacing between adjacent subcarriers.
  • a device such as a UE 115 or base station 105, utilizing eCCs may transmit wideband signals (e.g., according to frequency channel or carrier bandwidths of 20, 40, 60, 80 MHz, etc.) at reduced symbol durations (e.g., 16.67 microseconds).
  • a TTI in eCC may consist of one or multiple symbol periods. In some cases, the TTI duration (that is, the number of symbol periods in a TTI) may be variable.
  • Wireless communications systems such as an NR system may use a combination of licensed, shared, and unlicensed spectrum bands, among others.
  • the flexibility of eCC symbol duration and subcarrier spacing may allow for the use of eCC across multiple spectrums.
  • NR shared spectrum may increase spectrum utilization and spectral efficiency, specifically through dynamic vertical (e.g., across frequency) and horizontal (e.g., across time) sharing of resources.
  • a UE 115 may communicate over wireless communication links 125 with a particular serving base station 105.
  • the UE 115 may initiate a random access procedure via communication link 125 with a base station 105.
  • the random access procedure may be initiated as part of initial access, an RRC state transition from RRC Inactive/Idle states to RRC Connected state, a handover procedure as the UE 115 moves from one base station 105 to a target base station 105, or for small uplink data transmissions in RRC Inactive/Idle states.
  • the random access procedure may include several transmission messages, including HARQ- ACK feedback messages that acknowledge reception of a random access contention resolution message, such as Msg4 or MsgB.
  • the HARQ-ACK feedback message may be transmitted on PUCCH resource sets as indicated by the base station 105 via system information, prior to configuration of dedicated PUCCH resources.
  • the UE 115 may comprise a low-cost or low-complexity device, such as an NR- Light device, MTC device, or NB-IoT device.
  • the UE 115 may use coverage enhancement techniques, such as repetition of certain transmissions to extend coverage.
  • PUCCH transmissions prior to configuration of dedicated PUCCH resources such as transmission of HARQ-ACK messages after a contention resolution message during random access, may typically be transmitted without repetitions.
  • the UE 115 may, however, perform repetition of the PUCCH transmission as described in further detail in the present disclosure in order to improve coverage of the UE’s 115 random access transmissions. Further, even UEs 115 that are not considered NR-Light or low-cost devices may perform PUCCH transmission repetition in certain instances. Other procedures and details for supporting uplink control enhancements are described herein.
  • FIG. 2 illustrates an example of a wireless communication system 200 that supports a four-step RACH procedure in accordance with various aspects of the present disclosure.
  • wireless communication system 200 may implement aspects of wireless communication system 100.
  • wireless communication system 200 includes UE 115-a and base station 105-a, which may be examples of the corresponding devices described with reference to FIG. 1.
  • Wireless communication system 200 may support random access procedures for UEs 115-a that initiate access to a base station 105-a.
  • a typical RACH procedure may involve four transmissions.
  • a UE 115-a may transmit Msgl on the PRACH at 205.
  • the Msgl transmission is a first transmission that may include a PRACH preamble, including timing information for uplink transmissions that allow the base station 105-a to set timing advance parameters, for example.
  • the base station 105-a may transmit a Msg2 transmission on the PDCCH or PDSCH at 210.
  • the Msg2 transmission may also be referred to as a random access response (RAR) message, and the contents may include timing advance parameters or information, an uplink grant for the UE’s 115-a Msg3 transmission on the uplink, a temporary cell radio network temporary identifier (TC-RNTI), and the like.
  • RAR random access response
  • the TC-RNTI may be sent to the UE 115-a to indicate the scrambling sequence used for Msg4 transmission.
  • the UE 115-a may then transmit Msg3 on PUSCH at 215 using resources scheduled by the uplink grant of Msg2.
  • the contents of Msg3 may include an RRC connection request, a scheduling request, a buffer status of the UE 1150-a, or the like.
  • the base station 105-a may then transmit a contention resolution message referred to as Msg4 on the PDCCH or PDSCH at 220.
  • the UE 115-a then sends a HARQ-ACK message at 225 to acknowledge whether Msg4 was received at the UE 115-a or not.
  • a UE 115-a may use the RACH procedure described above to send small uplink data transmissions during RRC Idle/Inactive states in order to save on the overhead costs of leaving RRC Idle/Inactive states into RRC Connected state just to transmit a relatively small amount of data.
  • FIG. 3 illustrates an example of a wireless communication system 300 that supports a two-step RACH procedure in accordance with various aspects of the present disclosure.
  • wireless communication system 300 may implement aspects of wireless communication system 100.
  • wireless communication system 300 includes UE 115-a and base station 105-a, which may be examples of the corresponding devices described with reference to FIG. 1.
  • Wireless communication system 300 may support random access procedures for UEs 115-a that initiate access to a base station 105-a.
  • a base station 105-a may transmit broadcast information to multiple UEs in a synchronization signal PBCH block (SS/PBCH block) at 305.
  • the UE 115-a may receive and decode the SS/PBCH block to obtain system information, perform synchronization procedures, and measure channel conditions based on reference signals received in the PBCH block. Based on the information obtained from the SS/PBCH block, the UE 115-a may then initiate a two-step random access procedure by transmitting a first random access message MsgA to the base station 105-a at 310 and 315.
  • the random access message MsgA may be transmitted on both the PRACH and PUSCH, and may carry information similar to Msgl and Msg3 of the four- step random access procedure described above with reference to FIG. 2.
  • MsgA may include the random access preamble 310 on the PRACH as well as a random access payload 315 that includes a RRC connection request, a scheduling request, buffer status, and the like, on the PUSCH.
  • the base station 105-a may transmit a random access response in MsgB at 320.
  • MsgB may include timing advance information as well as a contention resolution message.
  • the UE 115-a may send a HARQ-ACK message at 325 to acknowledge successful reception of MsgB.
  • the HARQ-ACK message acknowledging the contention resolution message may be transmitted prior to the UE 115 receiving dedicated PUCCH resource configuration.
  • the UE 115 may transmit the HARQ-ACK message on PUCCH resources that are assigned via indication in system information (e.g., SIB 1).
  • the base station 105 may transmit an index in SIB 1 (e.g., remaining minimum system information (RMSI)) that specifies which resources to use for the PUCCH transmission that includes the HARQ-ACK message based on a table known to the UE 115 and the base station 105.
  • SIB 1 e.g., remaining minimum system information (RMSI)
  • the index provided by the base station 105-a may correspond to a particular row in a table, where the UE 115 can obtain the necessary information for identifying a set of PUCCH resources that could be used for transmitting the HARQ-ACK message.
  • the UE 115 determines that a PUCCH transmission will comprise PUCCH format 1, will be transmitted on symbol 10 of the uplink slot, will comprise four symbols in length, and will have a PRB offset starting at four.
  • the PUCCH transmission may have a cyclic shift based on a set of potential set of cyclic shift indexes comprising ⁇ 0, 3, 6, 9 ⁇ .
  • repetitions for PUCCH transmissions scheduled using dedicated PUCCH resources may typically be supported, while for PUCCH transmissions scheduled prior to configuration of dedicated PUCCH resources, repetition may not be supported.
  • Examples of PUCCH transmissions that may occur without or prior to configuration of dedicated PUCCH resources may include HARQ- ACK messages in response to Msg4 or MsgB reception during random access procedures.
  • Certain wireless communication deployments may require further coverage enhancements.
  • later deployments of NR may include NR- Light UEs 115, which may be considered mid-tier or low-tier UEs 115.
  • Examples of NR- Light UEs 115 may include wearables, industrial sensors, video monitoring devices, relaxed IT devices, and the like.
  • NR-Light UEs 115 may support smaller bandwidth capabilities (e.g., 10 MHz) than regular UEs (e.g., 100MHz or larger).
  • NR- Light UEs 115 may comprise lower cost or lower power UEs relative to eMBB or URLLC UEs.
  • the transmission power of NR-Light UEs may be several dB lower than the transmission power of eMBB/URLLC UEs 115, while the number of transmission antennas of NR-Light UEs 115 may be smaller (e.g., a single antenna).
  • NR-Light UEs 115 may have much smaller coverage compared to that of eMBB/URLLC UEs.
  • eMBB/URLLC UEs may have reduced coverage in high frequency bands, such as frequency bands above 24 GHz. Accordingly, PUCCH repetition for HARQ-ACK messages prior to configuration of dedicated PUCCH resources may provide coverage enhancement benefits to a variety of applications, including NR-Light UEs and other UEs operating in high frequency bands.
  • a UE 115 may apply repetition to PUCCH transmissions that do not have dedicated PUCCH resources configured. For example, in response to receiving Msg4 or MsgB during random access procedures, the UE 115 may transmit HARQ-ACK messages using a particular repetition level or factor on PUCCH resources prior to receiving configuration of dedicated PUCCH resources.
  • the base station 105 may signal the repetition level that the UE 115 should use to the UE 115.
  • the base station 105 may determine the appropriate repetition level that the UE 115 should use based on power measurements of prior transmissions received from the UE 115, such as the RACH preamble transmission, Msg3, or MsgA, and then transmit an indication of the repetition level to the UE 115 using various options.
  • the base station 105 may transmit the repetition level using system information, such as via SIB1, SIB2, or through RRC signaling.
  • the base station 105 may broadcast the repetition level such that multiple UEs 115 served by the base station 105 within the same cell may use the repetition level for HARQ-ACK transmissions.
  • the base station 105 may signal the repetition level to the UE 115 using dynamic scheduling via the DCI message that scheduled a prior random access contention resolution transmission, such as Msg4 or MsgB.
  • the base station 105 may schedule Msg4 transmission using DCI format 1_0 with a cyclic redundancy check (CRC) scrambled using a temporary cell radio network temporary identifier (TC-RNTI), and the UE 115 may determine the uplink resources to use for Msg4 transmission based on the received grant.
  • CRC cyclic redundancy check
  • TC-RNTI temporary cell radio network temporary identifier
  • DCI downlink assignment indicator
  • the HARQ-ACK transmission in response to reception of Msg4 or MsgB comprises only 1 bit.
  • the DAI portion that would typically be used for HARQ codebook size determination is not needed for HARQ-ACK transmission in response to reception of Msg4 or MsgB. Instead, those bits within the DAI that may then be used to dynamically indicate the repetition level to the UE 115. In particular, if the possible repetition levels for a UE 115 are 1, 2, 4, and 8, two DAI bits would need to be used to indicate the particular repetition level. If the base station 105 uses DCI to indicate the repetition level, the indication may be UE-specific, in contrast to the use of system information to convey the repetition level.
  • the UE 115 may determine the repetition level to use for transmitting the HARQ-ACK message based on a repetition level of a prior transmission. For example, the UE 115 may use the same repetition level for HARQ-ACK transmission on PUCCH as that used for transmission of Msg3 or MsgA on PUSCH.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the base station 105 may schedule the UE 115 for longer PUCCH transmissions (with N greater than the threshold) if the base station 105 determines that the UE 115 is operating under poor channel conditions and requires more coverage enhancement.
  • the longer PUCCH transmissions may then trigger the UE 115 to perform repetitions for PUCCH transmission based on a determined repetition level in accordance with the options described herein.
  • the repetition level or factor used by the UE 115 to enhance PUCCH transmissions may refer to a value equal to a number of times to repeat the PUCCH transmission or a level mapped to predefined numbers of repetitions.
  • the repetition level may comprise a value of four, indicating the UE 115 should repeat a transmission four times. In other instances, the repetition level may indicate a predefined number of repetitions per level.
  • FIG. 4 illustrates an example depiction 400 of possible PUCCH repetition patterns. As shown in the illustrated example, a UE 115 may perform PUCCH repetition either using inter-slot repetition or intra-slot repetition.
  • the repetition pattern may be based at least in part on the number N of OFDM symbols allotted for the PUCCH transmission, as determined based on the index received from the base station 105 indicating the PUCCH resources to use from Table 1.
  • indication i.e., an index of a row in Table 1
  • the UE 115 may perform inter-slot repetition, or repetitions of PUCCH across different slots.
  • the initial PUCCH transmission 418a may be scheduled for a first slot 415a, and the UE 115 may then transmit subsequent repetitions 418b, 418c, etc. of the PUCCH transmission 418a in subsequent slots 415b, 415c, etc.
  • inter-slot repetition each slot may include one repetition.
  • the UE 115 could perform inter-slot repetition as depicted in slots 425a, 425b, and 425c. In this instance, however, there would be relatively large latency between repetitions 428a, 428b, and 428c due to the smaller size of the PUCCH transmission. Accordingly, the UE 115 may instead perform intra-slot repetition in this situation, as shown in slots 435a, 435b, and 435c. Here, the UE 115 may transmit multiple repetitions of the initial scheduled PUCCH transmission within the same slot.
  • the UE 115 may transmit repetitions 438a and 438b in the same slot 435a, and similarly for repetitions 438d and 438e of PUCCH transmission 438f in slot 435b, and repetitions 438g and 438h of PUCCH transmission 438i in slot 435c. Further, as depicted in FIG. 4, the UE 115 may transmit repetitions of a scheduled PUCCH transmission in symbols that occur prior to the symbols scheduled for the initial PUCCH transmission. In FIG. 4, the UE 115 may determine that a scheduled PUCCH transmission 438c is to occur in slot 435a on particular resources at the end of the slot duration.
  • the UE 115 may transmit repetitions 438a and 438b on resources prior to the initially scheduled PUCCH transmission 438c.
  • the UE 115 may apply frequency hopping to the PUCCH transmission.
  • FIG. 5 illustrates an example depiction 500 of possible frequency hopping patterns when applied to PUCCH repetitions. As seen in FIG. 5, the UE 115 may transmit PUCCH repetitions in slots 510, 520 and 530.
  • the UE 115 may transmit a first portion of the PUCCH transmission in slot 510 using resources in a first frequency range 515a and a second portion in the same slot 510 using resources in a second frequency range 515b, and similarly for slots 520 and 530.
  • the UE 115 may transmit PUCCH repetitions in slots 540, 550, and 560.
  • the UE 115 may transmit the PUCCH transmission in slot 540 on resources in the same frequency range 545.
  • the UE 115 may transmit the PUCCH transmission on resources in a different frequency range 555.
  • the UE 115 may revert to the same frequency range as in slot 540 for transmitting the PUCCH transmission at frequency range 565.
  • the UE 115 may use intra-slot frequency hopping or inter-slot frequency hopping for PUCCH repetitions, depending on various factors. For example, in some instances, the base station 105 may transmit an indication of whether to perform intra slot frequency hopping or inter-slot frequency hopping (e.g., via SIB). In certain instances, the UE 115 may determine whether to perform intra-slot frequency hopping or inter-slot frequency hopping for PUCCH transmissions based on the length of each PUCCH repetition.
  • the UE 115 may perform intra-slot hopping if the length of each PUCCH repetition is greater than a threshold number of OFDM symbols (e.g., four OFDM symbols), but may perform inter-slot hopping if the length of each PUCCH repetition is less than the threshold number of OFDM symbols.
  • the UE 115 may determine the type of frequency hopping based on a fixed type of frequency hopping specified for the PUCCH transmission. For example, the UE 115 may perform one of the two types of frequency hopping — inter-slot hopping or intra slot hopping — by default or as specified by a wireless technical standards specification (e.g., NR standards).
  • the UE 115 may also apply different cyclic shifts to different repetitions of the PUCCH transmission.
  • the UE 115 may identify a set of possible cyclic shifts to apply to the PUCCH transmission. For example, if the UE 115 receives, from the base station 105, an index of 4 in SIB 1 to determine the PUCCH resources from Table 1, the UE 115 may determine that the set of possible cyclic shifts that are valid for that PUCCH transmission is ⁇ 0, 3, 6, 9 ⁇ . From the set of ⁇ 0, 3, 6, 9 ⁇ , the UE 115 may then determine one option from the set of valid cyclic shifts to apply to the PUCCH transmission.
  • the UE 115 may apply cyclic shift hopping based on the same set of ⁇ 0, 3, 6, 9 ⁇ indicated by the base station 105. In some instances, the UE 115 may move to the next option in the set of valid cyclic shifts, and so on for each repetition. For example, in the current example of the set of ⁇ 0, 3, 6, 9 ⁇ valid cyclic shifts for PUCCH transmission, if the first option from the set is cyclic shift of 3, the UE 115 would transmit a first repetition of PUCCH transmission using the cyclic shift of 3, and then follow the pattern for subsequent repetitions.
  • the second repetition of PUCCH would use cyclic shift of 6
  • the third repetition of PUCCH would use cyclic shift of 9
  • the fourth repetition of PUCCH would use cyclic shift of 0. Additional repetitions of PUCCH would continue with the sequence of cyclic shifts based on the same pattern.
  • FIG. 6 shows a flowchart illustrating a method 600 for uplink control enhancements in wireless communications in accordance with aspects of the present disclosure.
  • the operations of method 600 may be implemented by a UE 115 or its components as described herein.
  • the operations of method 600 may be performed by a communications manager as described with reference to FIG. 9.
  • a UE 115 may execute a set of codes to control the functional elements of the device to perform the functions described below. Additionally or alternatively, the UE 115 may perform aspects of the functions described below using special-purpose hardware.
  • the UE 115 may determine a Physical Uplink Control Channel (PUCCH) resource for a PUCCH transmission prior to receiving a dedicated PUCCH resource configuration.
  • the PUCCH transmission may contain a Hybrid Acknowledge Repeat Request Acknowledgement (HARCK-ACK) message in response to receiving a contention resolution message (e.g., Msg4 or MsgB) on a Physical Downlink Shared Channel (PDSCH) in a random access procedure.
  • HARCK-ACK Hybrid Acknowledge Repeat Request Acknowledgement
  • the UE 115 may determine a repetition level for the PUCCH transmission.
  • the UE 115 may receive the repetition level in a Downlink Control Information (DCI) message that schedules the contention resolution message, and in certain situations, the repetition level is indicated in a Downlink Assignment Indicator (DAI) of the DCI message. In other instances, the UE 115 may receive the repetition level in system information signaling. Alternatively, or in addition or in combination, the UE 115 may determine the repetition level based on a repetition level of a prior transmission, such as a message 3 Physical Uplink Shared Channel (PUSCH) transmission or a message A PUSCH transmission of the random access procedure. In some instances, the UE 115 may determine the repetition level based on a number of Orthogonal Frequency Division Multiplexing (OFDM) symbols of the PUCCH transmission. For example, the UE 115 may perform PUCCH repetition if the number of OFDM symbols in the indicated PUCCH resource is above a threshold, and may not perform PUCCH repetition if the number of OFDM symbols in the indicated PUCCH resource is below the threshold.
  • the UE 115 may transmit the PUCCH transmission, on at least the PUCCH resource, according to the repetition level.
  • transmitting the PUCCH transmission comprises performing intra-slot repetition or inter-slot repetition of the PUCCH transmission based on a number of Orthogonal Frequency Division Multiplexing (OFDM) symbols of the PUCCH transmission or a location of a first OFDM symbol of the PUCCH transmission.
  • OFDM Orthogonal Frequency Division Multiplexing
  • inter-slot repetition is performed if the number of OFDM symbols of the PUCCH transmission is above a threshold and intra-slot repetition is performed if the number OFDM symbols of the PUCCH transmission is below the threshold.
  • performing the intra-slot repetition includes transmitting at least one repetition of the PUCCH transmission prior to transmitting the PUCCH transmission on the PUCCH resource.
  • transmitting the PUCCH transmission comprises determining a type of frequency hopping for the PUCCH transmission, wherein the type of frequency hopping includes intra-slot frequency hopping or inter- slot frequency hopping and transmitting the PUCCH transmission according to the determined type of frequency hopping.
  • determining the type of frequency hopping includes receiving an indication of the type of frequency hopping to use for the PUCCH transmission, while in some cases, determining the type of frequency hopping comprises selecting intra-slot frequency hopping if a length of each PUCCH repetition is greater than a threshold number of OFDM symbols or inter-slot hopping if the length is less than the threshold number of OFDM symbols. In some instances, determining the type of frequency hopping is based on a fixed type of frequency hopping specified for the PUCCH transmission.
  • the UE 115 may perform cyclic shift hopping to the PUCCH repetitions.
  • the UE 115 may also further receive a set of cyclic shift indexes for applying cyclic shifts to the PUCCH transmission, determine a first cyclic shift to apply to a first repetition of the PUCCH transmission based on a first index of the set of cyclic shift indexes, identify at least one second cyclic shift to apply to a second repetition of the PUCCH transmission using an index subsequent to the first index in the set of cyclic shift indexes, and apply the first cyclic shift to the first repetition of the PUCCH transmission and the second cyclic shift to the second repetition of the PUCCH transmission.
  • FIG. 7 shows a flowchart illustrating a method 700 for uplink control enhancements in wireless communications in accordance with aspects of the present disclosure.
  • the operations of method 700 may be implemented by a base station 105 or its components as described herein.
  • the operations of method 700 may be performed by a communications manager as described with reference to FIG. 10.
  • a base station 105 may execute a set of codes to control the functional elements of the device to perform the functions described below. Additionally or alternatively, the base station 105 may perform aspects of the functions described below using special-purpose hardware.
  • the base station 105 transmits, to a user equipment (UE), information scheduling a PUCCH transmission on a PUCCH resource prior to configuring dedicated PUCCH resources for the UE 115.
  • the base station 105 also transmits a contention resolution message on a Physical Downlink Shared Channel (PDSCH) in a random access procedure, and the scheduled PUCCH transmission may contain a Hybrid Acknowledge Repeat Request Acknowledgement (HARCK-ACK) message indicating status of reception of the contention resolution message at the UE 115.
  • HARCK-ACK Hybrid Acknowledge Repeat Request Acknowledgement
  • the base station 105 may determine a repetition level for the PUCCH transmission.
  • the base station 105 may transmit, to the UE 115, an indication of the repetition level.
  • the transmitting the indication of the repetition level comprises transmitting the repetition level in a Downlink Control Information (DCI) message for scheduling the contention resolution message.
  • the base station 105 may include the repetition level in a Downlink Assignment Indicator (DAI) of the DCI message.
  • DCI Downlink Assignment Indicator
  • the base station 105 may transmit the indication of the repetition level in system information signaling.
  • the repetition level is determined based on a repetition level for prior transmission, such as a message 3 Physical Uplink Shared Channel (PUSCH) transmission or a message A PUSCH transmission in the random access procedure.
  • PUSCH Physical Uplink Shared Channel
  • the base station 105 may receive, according to the repetition level, a first repetition of the PUCCH transmission on the PUCCH resource as well as other repetitions of the PUCCH transmission.
  • the base station 105 may receive the PUCCH transmission via intra-slot repetition or inter-slot repetition based on a number of Orthogonal Frequency Division Multiplexing (OFDM) symbols of the PUCCH transmission or a location of a first OFDM symbol of the PUCCH transmission.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the base station 105 may receive the PUCCH transmission via inter-slot repetition if the number of OFDM symbols of the PUCCH transmission is above a threshold and via intra-slot repetition if the number OFDM symbols of the PUCCH transmission is below the threshold. If the base station 105 receives the PUCCH transmission via intra-slot repetition, the base station 105 may receive at least one repetition of the PUCCH transmission prior to receiving the PUCCH transmission on the PUCCH resource set.
  • the base station 105 may perform additional operations that are within the scope of the present disclosure. For example, the base station 105 may receive the PUCCH transmission via intra-slot frequency hopping or inter-slot frequency hopping. In some instances, the base station 105 may transmit to the UE an indication of the type of frequency hopping to use for the PUCCH transmission. In certain cases, the base station 105 may receive the PUCCH transmission via intra-slot frequency hopping if a length of each PUCCH repetition is greater than a threshold number of OFDM symbols and via inter-slot hopping if the length is less than the threshold number of OFDM symbols.
  • the base station may further transmit a set of cyclic shift indexes for applying cyclic shifts to the PUCCH transmission and receive a first repetition of the PUCCH transmission having a first cyclic shift based on a first index of the set of cyclic shift indexes and a second repetition of the PUCCH transmission having a second cyclic shift based on an index subsequent to the first index in the set of cyclic shift indexes.
  • FIG. 8 shows a block diagram 800 of a design of a base station/eNB/gNB 105 and a UE 115, which may be one of the base stations/eNBs/gNBs and one of the UEs in FIG. 1.
  • a transmit processor 820 may receive data from a data source 812 and control information from a controller/processor 840.
  • the control information may be for various control channels such as the PBCH, PCFICH, PHICH, PDCCH, EPDCCH, MPDCCH etc.
  • the data may be for the PDSCH, etc.
  • the transmit processor 820 may process (e.g., encode and symbol map) the data and control information to obtain data symbols and control symbols, respectively.
  • the transmit processor 820 may also generate reference symbols, e.g., for the PSS, SSS, and cell- specific reference signal.
  • a transmit (TX) multiple-input multiple-output (MIMO) processor 830 may perform spatial processing (e.g., precoding) on the data symbols, the control symbols, and/or the reference symbols, if applicable, and may provide output symbol streams to the modulators (MODs) 832a through 832t.
  • Each modulator 832 may process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream.
  • Each modulator 832 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal.
  • Downlink signals from modulators 832a through 832t may be transmitted via the antennas 834a through 834t, respectively.
  • the downlink signals may include random access procedure messages, such as Msg2 random access response messages on PDCCH or PDSCH, or Msg4 or MsgB contention resolution messages on PDCCH or PDSCH.
  • the downlink signals may also include a transmission of information for scheduling a PUCCH transmission, such as HARQ-ACK message in response to reception of Msg4 or MsgB contention resolution messages, on a PUCCH resource prior to configuration of dedicated PUCCH resources for the UE 115.
  • An example of the information for scheduling the PUCCH transmission may include an index in SIB 1 that corresponds to resources in a predefined table, such as Table 1 above, for the UE 115 to determine the scheduled PUCCH resources for the HARQ-ACK message.
  • the downlink signals may also include indication of a repetition level for the UE 115 to apply a number of repetitions to PUCCH transmissions prior to configuration of dedicated PUCCH resources, as described above with reference to FIGs. 2-7.
  • the antennas 852a through 852r may receive the downlink signals from the eNB 105 and may provide received signals to the demodulators (DEMODs) 854a through 854r, respectively.
  • Each demodulator 854 may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples.
  • Each demodulator 854 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols.
  • a MIMO detector 856 may obtain received symbols from all the demodulators 854a through 854r, perform MIMO detection on the received symbols if applicable, and provide detected symbols.
  • a receive processor 858 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for the UE 115 to a data sink 860, and provide decoded control information to a controller/processor 880.
  • a transmit processor 864 may receive and process data (e.g., for the PUSCH) from a data source 862 and control information (e.g., for the PUCCH) from the controller/processor 880.
  • the transmit processor 864 may also generate reference symbols for a reference signal.
  • the symbols from the transmit processor 864 may be precoded by a TX MIMO processor 866 if applicable, further processed by the modulators 854a through 854r (e.g., for SC-FDM, etc.), and transmitted to the eNB 105.
  • the transmissions to the eNB 105 may include random access messages, such as a Msgl or MsgA PRACH preamble message or Msg3 PUSCH transmissions, for example.
  • the transmissions to the eNB 105 may also include HARQ- ACK messages on PUCCH resources prior to configuration of dedicated PUCCH resources.
  • the uplink signals from the UE 115 may be received by the antennas 834, processed by the demodulators 832, detected by a MIMO detector 836 if applicable, and further processed by a receive processor 838 to obtain decoded data and control information sent by the UE 115.
  • the processor 838 may provide the decoded data to a data sink 839 and the decoded control information to the controller/processor [0104]
  • the controllers/processors 840 and 880 may direct the operation at the eNB 105 and the UE 115, respectively.
  • the controller/processor 840 and/or other processors and modules at the eNB 105 may perform or direct the execution of the functional blocks illustrated in FIG. 7, and/or other various processes for the techniques described herein.
  • the controllers/processor 880 and/or other processors and modules at the UE 115 may also perform or direct the execution of the functional blocks illustrated in FIG. 6, and/or other processes for the techniques described herein.
  • the memories 842 and 882 may store data and program codes for the eNB 105 and the UE 115, respectively.
  • memory 842 may store instructions that, when performed by the processor 840 or other processors depicted in FIG. 8, cause the base station 105 to perform operations described with respect to FIG. 7.
  • memory 882 may store instructions that, when performed by processor 880 or other processors depicted in FIG. 8 cause the UE 115 to perform operations described with respect to FIG. 6.
  • a scheduler 844 may schedule UEs for data transmission on the downlink and/or uplink.
  • FIG. 8 While blocks in FIG. 8 are illustrated as distinct components, the functions described above with respect to the blocks may be implemented in a single hardware, software, firmware, or combination component or in various combinations of components.
  • the functions described with respect to the transmit processor 820, the receive processor 838, or the TX MIMO processor 830 may be performed by or under the control of processor 840.
  • a UE 900 such as a UE 115 ( see FIG. 8), may have a controller/processor 880, a memory 882, and antennas 852a through 852r, as described above with respect to FIG. 8.
  • UE 900 may also have wireless radios 801a to 801r that comprise additional components also described above with reference to FIG. 8.
  • the memory 882 of UE 900 stores one or more algorithms that configure processor/controller 880 to carry out one or more procedures including, for example, those described above with reference to FIG. 6.
  • One or more algorithms stored by memory 882 configure processor/controller 880 to carry out one or more procedures relating to wireless communication by the UE 900, as previously described.
  • a random access manager 902 may configure controller/processor 880 to perform operations that include coordinating random access procedures and generating or receiving random access messages, as described above with reference to FIG. 2 and FIG. 3, for transmission and reception using wireless radios 801a-r and antennas 852a-r.
  • the random access messages may include contention resolution messages (e.g., MsgA or Msg4) and HARQ-ACK transmissions, in response to reception of the contention resolution messages, transmitted by UE 900 to gNB 1000.
  • a coverage enhancement manager 904 may configure controller/processor 880 to determine a PUCCH resource for a PUCCH transmission prior to receiving a dedicated PUCCH resource configuration and determine a repetition level for the PUCCH transmission.
  • a communication manager 906 may configure controller/processor 880 to carry out operations including communicating, via wireless radios 801a to 801r, on a control or shared channel, the PUCCH transmission according to the repetition level. Other operations as described above may be carried out by one or more of the described algorithms or components 902, 904, 906 and/or their various subcomponents.
  • Each of the illustrated components 902, 904, and 906 and/or at least some of their various sub-components may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions of the random access manager 902, coverage enhancement manager 904, communication manager 906 and/or at least some of their various sub components may be executed by a general-purpose processor, a digital signal processor (DSP), an application- specific integrated circuit (ASIC), an field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.
  • DSP digital signal processor
  • ASIC application-specific integrated circuit
  • FPGA field-programmable gate array
  • random access manager 902, coverage enhancement manager 904, communication manager 906 and/or at least some of their various sub-components may be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations by one or more physical devices.
  • random access manager 902, coverage enhancement manager 904, communication manager 906 and/or at least some of their various sub-components may be a separate and distinct component in accordance with various aspects of the present disclosure.
  • random access manager 902, coverage enhancement manager 904, communication manager 906 and/or at least some of their various sub-components may be combined with one or more other hardware components, including but not limited to an I/O component, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof in accordance with various aspects of the present disclosure.
  • a base station 1000 such as a base station 105 ( see FIG. 8), may have a controller/processor 840, a memory 842, and antennas 834a through 834t, as described above.
  • the base station 1000 may also have wireless radios 801a to 801t that comprise additional components also described above with reference to FIG. 8.
  • the memory 842 of base station 1000 stores one or more algorithms that configure processor/controller 840 to carry out one or more procedures as described above with reference to FIG. 7.
  • One or more algorithms stored by memory 842 configure processor/controller 840 to carry out one or more operations relating to wireless communication by the base station 1000, as previously described.
  • a random access manager 1002 configures controller processor 840 to carry out operations that include coordinating random access procedures and generating or receiving random access messages, as described above with reference to FIG. 2 and FIG. 3, for transmission and reception using wireless radios 801a-r and antennas 834a-r.
  • the random access messages may include contention resolution messages (e.g., MsgA or Msg4) and PUCCH transmissions, comprising HARQ-ACK in response to reception of the contention resolution messages, transmitted by UE 900 to gNB 1000.
  • a coverage enhancement manager 1004 may configure controller/processor 840 to determine a PUCCH resource for the PUCCH transmission prior to receiving a dedicated PUCCH resource configuration and determine a repetition level for the PUCCH transmission.
  • a communication manager 906 may configure controller/processor 740 to carry out operations including transmitting information scheduling the PUCCH transmission, transmitting the repetition level for the PUCCH transmission, and receiving the PUCCH transmission according to the repetition level, via wireless radios 801a to 801r and antennas 834a to 834r. Other operations as described above may be carried out by one or more of the described algorithms or components 1002, 1004, 1006 and/or their various subcomponents.
  • Each of the illustrated components 1002, 1004, and 1006 and/or at least some of their various sub-components may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions of the random access manager 1002, coverage enhancement manager 1004, communication manager 1006 and/or at least some of their various sub-components may be executed by a general-purpose processor, a digital signal processor (DSP), an application- specific integrated circuit (ASIC), an field-programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in the present disclosure.
  • DSP digital signal processor
  • ASIC application-specific integrated circuit
  • FPGA field-programmable gate array
  • random access manager 1002, coverage enhancement manager 1004, communication manager 1006 and/or at least some of their various sub-components may be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations by one or more physical devices.
  • random access manager 1002, coverage enhancement manager 1004, communication manager 1006 and/or at least some of their various sub-components may be a separate and distinct component in accordance with various aspects of the present disclosure.
  • random access manager 1002, coverage enhancement manager 1004, communication manager 1006 and/or at least some of their various sub-components may be combined with one or more other hardware components, including but not limited to an I/O component, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof in accordance with various aspects of the present disclosure.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • a CDMA system may implement a radio technology such as CDMA2000, Universal Terrestrial Radio Access (UTRA), etc.
  • CDMA2000 covers IS-2000, IS-95, and IS-856 standards.
  • IS-2000 Releases may be commonly referred to as CDMA2000 IX, IX, etc.
  • IS-856 TIA-856) is commonly referred to as CDMA2000 lxEV-DO, High Rate Packet Data (HRPD), etc.
  • UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA.
  • a TDMA system may implement a radio technology such as Global System for Mobile Communications (GSM).
  • GSM Global System for Mobile Communications
  • An OFDMA system may implement a radio technology such as Ultra Mobile Broadband (UMB), Evolved UTRA (E-UTRA), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, etc.
  • UMB Ultra Mobile Broadband
  • E-UTRA Evolved UTRA
  • IEEE Institute of Electrical and Electronics Engineers
  • Wi-Fi Wi-Fi
  • WiMAX IEEE 802.16
  • IEEE 802.20 Flash-OFDM
  • UMB Ultra Mobile Broadband
  • E-UTRA Evolved UTRA
  • IEEE 802.11 Wi-Fi
  • WiMAX IEEE 802.16
  • Flash-OFDM Flash-OFDM
  • UTRA and E-UTRA are part of Universal Mobile Telecommunications System (UMTS).
  • LTE and LTE-A are releases of UMTS that use E-UTRA.
  • CDMA2000 and UMB are described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2).
  • 3GPP2 3rd Generation Partnership Project 2
  • the techniques described herein may be used for the systems and radio technologies mentioned above as well as other systems and radio technologies. While aspects of an LTE or an NR system may be described for purposes of example, and LTE or NR terminology may be used in much of the description, the techniques described herein are applicable beyond LTE or NR applications.
  • a macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs 115 with service subscriptions with the network provider.
  • a small cell may be associated with a lower- powered base station 105, as compared with a macro cell, and a small cell may operate in the same or different (e.g., licensed, unlicensed, etc.) frequency bands as macro cells.
  • Small cells may include pico cells, femto cells, and micro cells according to various examples.
  • a pico cell for example, may cover a small geographic area and may allow unrestricted access by UEs 115 with service subscriptions with the network provider.
  • a femto cell may also cover a small geographic area (e.g., a home) and may provide restricted access by UEs 115 having an association with the femto cell (e.g., UEs 115 in a closed subscriber group (CSG), UEs 115 for users in the home, and the like).
  • An eNB for a macro cell may be referred to as a macro eNB .
  • An eNB for a small cell may be referred to as a small cell eNB, a pico eNB, a femto eNB, or a home eNB.
  • An eNB may support one or multiple (e.g., two, three, four, and the like) cells, and may also support communications using one or multiple component carriers.
  • the wireless communications system 100 or systems described herein may support synchronous or asynchronous operation.
  • the base stations 105 may have similar frame timing, and transmissions from different base stations 105 may be approximately aligned in time.
  • the base stations 105 may have different frame timing, and transmissions from different base stations 105 may not be aligned in time.
  • the techniques described herein may be used for either synchronous or asynchronous operations.
  • Information and signals described herein may be represented using any of a variety of different technologies and techniques.
  • data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
  • DSP digital signal processor
  • ASIC application-specific integrated circuit
  • FPGA field- programmable gate array
  • PLD programmable logic device
  • 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, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).
  • Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • a non-transitory storage medium may be any available medium that can be accessed by a general purpose or special purpose computer.
  • non-transitory computer-readable media may comprise random-access memory (RAM), read-only memory (ROM), electrically erasable programmable read only memory (EEPROM), flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to carry or store desired program code means in the form of instructions or data structures and that can be accessed by a general-purpose or special-purpose computer, or a general- purpose or special-purpose processor. Also, any connection is properly termed a computer-readable medium.
  • Disk and disc include 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 are also included within the scope of computer-readable media.

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

Abstract

La présente invention concerne des procédés, des systèmes et des dispositifs de communication sans fil. Un dispositif sans fil peut déterminer une ressource de canal de commande de liaison montante physique (PUCCH) pour une transmission de PUCCH avant de recevoir une configuration de ressource de PUCCH dédiée, déterminer un niveau de répétition pour la transmission de PUCCH, et transmettre la transmission de PUCCH, sur au moins la ressource de PUCCH, selon le niveau de répétition. Une station de base peut transmettre, à un équipement utilisateur (UE), des informations d'ordonnancement d'une transmission de canal de commande de liaison montante physique (PUCCH) sur une ressource de PUCCH avant de configurer des ressources de PUCCH dédiées pour l'UE, déterminer un niveau de répétition pour la transmission de PUCCH, transmettre, à l'UE, une indication du niveau de répétition, et recevoir, selon le niveau de répétition, une première répétition de la transmission de PUCCH sur la ressource de PUCCH et d'autres répétitions de la transmission de PUCCH.
PCT/US2020/052799 2019-09-27 2020-09-25 Répétition de pucch avant établissement de connexion rrc WO2021062209A1 (fr)

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US201917031531A 2019-09-27 2019-09-27
US201962907111P 2019-09-27 2019-09-27
US62/907,111 2019-09-27
US17/031,531 2019-09-27

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WO2024071907A1 (fr) * 2022-09-28 2024-04-04 Samsung Electronics Co., Ltd. Procédé et appareil pour prendre en charge des répétitions d'une transmission de pucch avec des informations harq-ack
WO2024067277A1 (fr) * 2022-09-26 2024-04-04 维沃移动通信有限公司 Procédé de transmission répétée par pucch commun, terminal et dispositif côté réseau
WO2024072956A1 (fr) * 2022-09-29 2024-04-04 Ofinno, Llc Répétitions de canal de commande de liaison montante dans des réseaux non terrestres
WO2024098212A1 (fr) * 2022-11-07 2024-05-16 Oppo广东移动通信有限公司 Procédé de communication sans fil, dispositif terminal et dispositif réseau
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12028861B2 (en) 2021-08-05 2024-07-02 Qualcomm Incorporated Physical uplink control channel repetition across multiple component carriers
WO2023206102A1 (fr) * 2022-04-26 2023-11-02 Oppo广东移动通信有限公司 Procédé de transmission, dispositif terminal et dispositif de réseau
WO2024067277A1 (fr) * 2022-09-26 2024-04-04 维沃移动通信有限公司 Procédé de transmission répétée par pucch commun, terminal et dispositif côté réseau
WO2024071907A1 (fr) * 2022-09-28 2024-04-04 Samsung Electronics Co., Ltd. Procédé et appareil pour prendre en charge des répétitions d'une transmission de pucch avec des informations harq-ack
WO2024072956A1 (fr) * 2022-09-29 2024-04-04 Ofinno, Llc Répétitions de canal de commande de liaison montante dans des réseaux non terrestres
WO2024098212A1 (fr) * 2022-11-07 2024-05-16 Oppo广东移动通信有限公司 Procédé de communication sans fil, dispositif terminal et dispositif réseau

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