WO2022027414A1 - Accusé de réception ou accusé de réception négatif pour des communications de liaison montante à autorisation configurée - Google Patents

Accusé de réception ou accusé de réception négatif pour des communications de liaison montante à autorisation configurée Download PDF

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Publication number
WO2022027414A1
WO2022027414A1 PCT/CN2020/107330 CN2020107330W WO2022027414A1 WO 2022027414 A1 WO2022027414 A1 WO 2022027414A1 CN 2020107330 W CN2020107330 W CN 2020107330W WO 2022027414 A1 WO2022027414 A1 WO 2022027414A1
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WO
WIPO (PCT)
Prior art keywords
configured grant
bitmap
resource
ack
uplink data
Prior art date
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PCT/CN2020/107330
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English (en)
Inventor
Siyi Chen
Changlong Xu
Jing Sun
Xiaoxia Zhang
Rajat Prakash
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Qualcomm Incorporated
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Publication date
Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to PCT/CN2020/107330 priority Critical patent/WO2022027414A1/fr
Publication of WO2022027414A1 publication Critical patent/WO2022027414A1/fr

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    • 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
    • H04L1/1864—ARQ related signaling
    • 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
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1614—Details of the supervisory signal using bitmaps
    • 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
    • H04L1/189—Transmission or retransmission of more than one copy of a message
    • 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

Definitions

  • This application relates to wireless communication systems, and more particularly to acknowledgement (ACK) or negative acknowledgement (NACK) of uplink data communications, including hybrid automatic repeat request (HARQ) data communications, in a licensed radio frequency band.
  • ACK acknowledgement
  • NACK negative acknowledgement
  • HARQ hybrid automatic repeat request
  • Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power) .
  • a wireless multiple-access communications system may include a number of base stations (BSs) , each simultaneously supporting communications for multiple communication devices, which may be otherwise known as user equipment (UE) .
  • BSs base stations
  • UE user equipment
  • NR next generation new radio
  • LTE long term evolution
  • NR next generation new radio
  • 5G 5 th Generation
  • LTE long term evolution
  • NR next generation new radio
  • NR is designed to provide a lower latency, a higher bandwidth or a higher throughput, and a higher reliability than LTE.
  • NR is designed to operate over a wide array of spectrum bands, for example, from low-frequency bands below about 1 gigahertz (GHz) and mid-frequency bands from about 1 GHz to about 6 GHz, to high-frequency bands such as millimeter wave (mmWave) bands.
  • GHz gigahertz
  • mmWave millimeter wave
  • NR is also designed to operate across different spectrum types, from licensed spectrum to unlicensed and shared spectrum. Spectrum sharing enables operators to opportunistically aggregate spectrums to dynamically support high-bandwidth services. Spectrum sharing can extend the benefit of NR technologies to operating entities that may not have access to a licensed spectrum.
  • a BS may communicate with a UE in an uplink direction (e.g., in physical uplink shared channel (PUSCH) via dynamic scheduling or configured grants.
  • Dynamic scheduling may refer to the BS transmitting a scheduling grant indicating uplink resources and/or transmission to a UE per uplink transmission.
  • Configured grant may refer the BS configuring the UE with a set of resources for uplink transmissions and the UE may transmit in the set of configured grant (CG) resources without having to receive scheduling grant from the BS per uplink transmissions.
  • Configure grant transmissions may also be referred to as grant-free transmissions.
  • configured grant transmissions There are two types of configured grant transmissions, a type 1 configured grant, which may be directly provided by radio resource control (RRC) including a periodicity for the type 1 configured grant, and a type 2 configured grant, where RRC defines the periodicity while physical downlink control channel (PDCCH) addressed to configured scheduling RNTI (CS-RNTI) can either signal or activate the type 2 configured grant.
  • RRC radio resource control
  • PDCH physical downlink control channel addressed to configured scheduling RNTI
  • CS-RNTI configured scheduling RNTI
  • the configured grant transmissions without a grant can avoid the regular handshake delay, for example, sending a scheduling request and waiting for an uplink allocation. Additionally, since no per transmission dynamic scheduling grant is used for configured grant transmissions, the downlink control channel requirements can be relaxed.
  • HARQ Hybrid Automatic Repeat Request
  • a receiver may use forward error-correction (FEC) to correct one or more errors and relies on error detection to detect undetectable errors.
  • FEC forward error-correction
  • the receiver may discard received packets with errors (uncorrectable errors) and may request retransmission of the packets received with errors.
  • FEC-based configured grant transmission technique improvements may also yield benefits.
  • a method for operating a wireless network having at least one wireless node in a licensed frequency band is described.
  • a BS may configure a UE with configured grant resources within the licensed frequency band.
  • the UE may transmit data packets to the BS using the configured grant resources.
  • the UE may apply Hybrid Automatic Repeat Request (HARQ) techniques to the configured grant transmissions.
  • the BS may receive the data packets from the UE and decode the data packets to reconstruct the original messages.
  • the BS may generate acknowledgement/negative-acknowledgement (ACK/NACK) feedbacks for each of the data packets indicating whether each data packet is successfully decoded or not.
  • ACK/NACK acknowledgement/negative-acknowledgement
  • the BS may transmit the ACK/NACK feedbacks to the UE in the form of downlink control information (DCI) messages, for example, via a physical downlink control channel (PDCCH) .
  • DCI downlink control information
  • PDCCH physical downlink control channel
  • the UE may retransmit the data packet using a subsequent configured grant resource in the licensed frequency band.
  • a method of wireless communication performed by a user equipment includes transmitting, to a base station (BS) in a first configured grant resource within a licensed radio frequency band, uplink data in a first configured grant transmission; and receiving, from the BS in the licensed radio frequency band, a downlink control information (DCI) message including an acknowledgement/negative-acknowledgement (ACK/NACK) feedback for the uplink data.
  • DCI downlink control information
  • a user equipment includes a transceiver configured to transmit, to a base station (BS) in a first configured grant resource within a licensed radio frequency band, uplink data in a first configured grant transmission; and receive, from the BS in the licensed radio frequency band, a downlink control information (DCI) message including an acknowledgement/negative-acknowledgement (ACK/NACK) feedback for the uplink data.
  • DCI downlink control information
  • a base station includes a transceiver configured to receive, from a user equipment (UE) in a first configured grant resource within a licensed radio frequency band, uplink data in a first configured grant transmission; and transmit, to the UE in the licensed radio frequency band, a downlink control information (DCI) message including an acknowledgement/negative-acknowledgement (ACK/NACK) feedback for the uplink data.
  • DCI downlink control information
  • a non-transitory computer-readable medium having program code recorded thereon for wireless communication by a UE includes code for causing the UE to transmit to a base station (BS) in a first configured grant resource within a licensed radio frequency band, uplink data in a first configured grant transmission; and code for causing the UE to receive from the BS in the licensed radio frequency band, a downlink control information (DCI) message including an acknowledgement/negative-acknowledgement (ACK/NACK) feedback for the uplink data.
  • DCI downlink control information
  • ACK/NACK acknowledgement/negative-acknowledgement
  • a UE includes means for transmitting, to a base station (BS) in a first configured grant resource within a licensed radio frequency band, uplink data in a first configured grant transmission; and means for receiving, from the BS in the licensed radio frequency band, a downlink control information (DCI) message including an acknowledgement/negative-acknowledgement (ACK/NACK) feedback for the uplink data.
  • DCI downlink control information
  • a base station includes means for receiving, from a user equipment (UE) in a first configured grant resource within a licensed radio frequency band, uplink data in a first configured grant transmission; and means for transmitting, to the UE in the licensed radio frequency band, a downlink control information (DCI) message including an acknowledgement/negative-acknowledgement (ACK/NACK) feedback for the uplink data.
  • DCI downlink control information
  • FIG. 1 illustrates a wireless communication network according to some aspects of the present disclosure.
  • FIG. 2 illustrates a radio frame structure according to some aspects of the present disclosure.
  • FIG. 3 illustrates a hybrid automatic repeat request (HARQ) communication scenario according to some aspects of the present disclosure.
  • FIG. 4 illustrates an uplink configured grant re-transmission scenario according to some aspects of the present disclosure.
  • FIG. 5 illustrates an uplink configured grant re-transmission scenario according to some aspects of the present disclosure.
  • FIG. 6 is a sequence diagram illustrating a communication method according to some aspects of the present disclosure.
  • FIG. 7 illustrates a downlink control information message structure according to some aspects of the present disclosure.
  • FIG. 8 illustrates a downlink control information message structure according to some aspects of the present disclosure.
  • FIG. 9 illustrates a downlink control information message structure according to some aspects of the present disclosure.
  • FIG. 10 illustrates a block diagram of a user equipment (UE) according to some aspects of the present disclosure.
  • FIG. 11 illustrates a block diagram of a base station (BS) according to some aspects of the present disclosure.
  • FIG. 12 is a flow diagram of a communication method according to some aspects of the present disclosure.
  • FIG. 13 is a flow diagram of a communication method according to some aspects of the present disclosure.
  • wireless communications systems also referred to as wireless communications networks.
  • the techniques and apparatus may be used for wireless communication networks such as code division multiple access (CDMA) networks, time division multiple access (TDMA) networks, frequency division multiple access (FDMA) networks, orthogonal FDMA (OFDMA) networks, single-carrier FDMA (SC-FDMA) networks, LTE networks, Global System for Mobile Communications (GSM) networks, 5 th Generation (5G) or new radio (NR) networks, as well as other communications networks.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal FDMA
  • SC-FDMA single-carrier FDMA
  • LTE Long Term Evolution
  • GSM Global System for Mobile Communications
  • 5G 5 th Generation
  • NR new radio
  • An OFDMA network may implement a radio technology such as evolved UTRA (E-UTRA) , Institute of Electrical and Electronics Engineers (IEEE) 802.11, IEEE 802.16, IEEE 802.20, flash-OFDM and the like.
  • E-UTRA evolved UTRA
  • IEEE Institute of Electrical and Electronics Engineers
  • GSM Global System for Mobile communications
  • LTE long term evolution
  • UTRA, E-UTRA, GSM, UMTS and LTE are described in documents provided from an organization named “3rd Generation Partnership Project” (3GPP)
  • cdma2000 is described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2) .
  • 3GPP 3rd Generation Partnership Project
  • 3GPP long term evolution LTE
  • LTE long term evolution
  • 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, NR, and beyond with shared access to wireless spectrum between networks using a collection of new and different radio access technologies or radio air interfaces.
  • 5G networks contemplate diverse deployments, diverse spectrum, and diverse services and devices that may be implemented using an OFDM-based unified, air interface.
  • further enhancements to LTE and LTE-A are considered in addition to development of the new radio technology for 5G NR networks.
  • the 5G NR will be capable of scaling to provide coverage (1) to a massive Internet of things (IoTs) with a ULtra-high density (e.g., ⁇ 1M nodes/km 2 ) , ultra-low complexity (e.g., ⁇ 10s of bits/sec) , ultra-low energy (e.g., ⁇ 10+years of battery life) , and deep coverage with the capability to reach challenging locations; (2) including mission-critical control with strong security to safeguard sensitive personal, financial, or classified information, ultra-high reliability (e.g., ⁇ 99.9999%reliability) , ultra-low latency (e.g., ⁇ 1 ms) , and users with wide ranges of mobility or lack thereof; and (3) with enhanced mobile broadband including extreme high capacity (e.g., ⁇ 10 Tbps/km 2 ) , extreme data rates (e.g., multi-Gbps rate, 100+ Mbps user experienced rates) , and deep awareness with advanced discovery and optimizations.
  • IoTs Internet of things
  • the 5G NR may be implemented to use optimized OFDM-based waveforms with scalable numerology and transmission time interval (TTI) ; having a common, flexible framework to efficiently multiplex services and features with a dynamic, low-latency time division duplex (TDD) /frequency division duplex (FDD) design; and with advanced wireless technologies, such as massive multiple input, multiple output (MIMO) , robust millimeter wave (mmWave) transmissions, advanced channel coding, and device-centric mobility.
  • TTI transmission time interval
  • MIMO massive multiple input, multiple output
  • mmWave millimeter wave
  • Scalability of the numerology in 5G NR with scaling of subcarrier spacing, may efficiently address operating diverse services across diverse spectrum and diverse deployments.
  • subcarrier spacing may occur with 15 kHz, for example over 5, 10, 20 MHz, and the like bandwidth (BW) .
  • BW bandwidth
  • subcarrier spacing may occur with 30 kHz over 80/100 MHz BW.
  • the subcarrier spacing may occur with 60 kHz over a 160 MHz BW.
  • subcarrier spacing may occur with 120 kHz over a 500 MHz BW.
  • the scalable numerology of the 5G NR facilitates scalable TTI for diverse latency and quality of service (QoS) requirements. For example, shorter TTI may be used for low latency and high reliability, while longer TTI may be used for higher spectral efficiency.
  • QoS quality of service
  • 5G NR also contemplates a self-contained integrated subframe design with UL/downlink scheduling information, data, and acknowledgement in the same subframe.
  • the self-contained integrated subframe supports communications in unlicensed or contention-based shared spectrum, adaptive UL/downlink that may be flexibly configured on a per-cell basis to dynamically switch between UL and downlink to meet the current traffic needs.
  • an aspect disclosed herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways.
  • an apparatus may be implemented or a method may be practiced using any number of the aspects set forth herein.
  • such an apparatus may be implemented or such a method may be practiced using other structure, functionality, or structure and functionality in addition to or other than one or more of the aspects set forth herein.
  • a method may be implemented as part of a system, device, apparatus, and/or as instructions stored on a computer readable medium for execution on a processor or computer.
  • an aspect may comprise at least one element of a claim.
  • a base station may configure a user equipment (UE) with a configured grant for autonomous transmission or non-scheduled transmission.
  • Each configured grant may be associated with a set of resources configured for the UE to transmit UL communications (e.g., data and/or control information) without being scheduled by the BS.
  • the set of resource configured by the configured grant may be referred to as configured grant resources.
  • the set of configured grant resources may occur periodically.
  • the set of configured grant resources may correspond to transmission time occasions.
  • CG configured grant
  • PUSCH physical uplink shared channel transmission
  • radio resource control (RRC) signaling can configure the time domain resources including the periodicity of configured grant resources, offset, start symbol and length of PUSCH, and/or the number of transmission time occasions.
  • RRC signaling may configure the periodicity and the number of transmission time occasions.
  • Other time domain parameters may be configured through an activation downlink control information (DCI) .
  • DCI downlink control information
  • the configured grant resources may be shared among several UEs.
  • the UE may apply hybrid automatic repeat request (HARQ) techniques to the UL data transmission.
  • the UL data transmission may be in the form of a transport block (TB) .
  • TB transport block
  • HARQ hybrid automatic repeat request
  • the BS may schedule the UE with a new data transmission.
  • the BS may schedule the UE with a retransmission schedule to retransmit the UL data transmission.
  • CG scheduling there is no per transmission scheduling. As such, the BS may not be able to schedule the UE with a retransmission when the BS fails to receive an CG uplink data transmission successfully from the UE.
  • the present application describes mechanisms for feedback enhancements in UL HARQ data transmissions using configured grant resources in a licensed frequency band.
  • a BS may utilize CG mechanisms to configure a UE with a set of configured grant resources within a licensed band for uplink data transmissions with HARQ.
  • the UE can transmit UL data in the set of configured grant resources (without having to receive a dynamic scheduling per configured grant resource) .
  • the UE may implement one or more HARQ processes and each UL data transmission in the configured grant resource can be associated with one of the one or more HARQ processes.
  • the BS can receive the UL data from the UE by performing a decoding algorithm to recover the UL data in the set of configured grant resources. Since there is no per transmission scheduling with CGs, the BS may generate an ACK/NACK feedback for each UL transmission received from a configured grant resource. For instance, the BS may generate an ACK or NACK signal for a CG UL transmission depending on whether the UL data received in ta configured grant resource is received and decoded correctly or not. In response to the ACK/NACK received from the BS, the UE may retransmit the UL data for those configured grant resources that receive a NACK feedback signal. For instance, the UE may retransmit a configured grant UL data that the BS fails to receive in a subsequent configured grant resource.
  • the BS can provide ACK/NACKs to the UE via DCI messages.
  • the DCI message (s) can provide the UE with information such as number of resource blocks, resource allocation type, modulation scheme, transport block, redundancy version, HARQ information, power control commands, coding rate, etc.
  • DCIs can be transmitted on a physical downlink control channel (PDCCH) .
  • PDCCH physical downlink control channel
  • multiple DCI formats can be utilized.
  • the BS may indicate an ACK/NACK for a CG UL transmission received over a licensed band using DCI format 0_1.
  • DCI format 0_1 can be used for the scheduling of one or multiple PUSCH in a cell or indicating CG downlink feedback information (CG-DFI) .
  • the BS may indicate in a DCI format 0_1 message that the message is a CG-DFI message including an ACK/NACK for a CG UL transmission.
  • the BS may include ACK/NACKs for multiple CG UL transmissions of different UL HARQ processes.
  • a radio network temporary identifier can be used to identify a connected UE in the cell, a specific radio channel, a group of UEs in the case of paging, etc.
  • RNTI radio network temporary identifier
  • CS-RNTI configured scheduling RNTI
  • CG type 1 CS-RNTI can be limited to use for re-transmission.
  • CG type 2 CS-RNTI can be used for activation, deactivation, and re-transmission of CG UL data transmissions.
  • the BS may indicate the activation of CG type 2 or indicate the DCI message is a CG-DFI message.
  • the DCI format 0_1 can be utilized to provide indications to a UE operating in a cell associated with a shared spectrum or associated with an unshared (licensed) spectrum.
  • the BS may indicate an ACK//NACK for a CG UL transmission received over a licensed band using DCI format 2_2.
  • DCI format 2_2 can be used for indicating a transmit power control command (TPC) for physical uplink control channel (PUCCH) and/or physical uplink shared channel (PUSCH) transmissions.
  • TPC transmit power control command
  • PUCCH physical uplink control channel
  • PUSCH physical uplink shared channel
  • the BS may extend the DCI format 2_2 to include additional bits for indicating ACK/NACKs for CG UL transmissions.
  • different CG configurations can be used for different HARQ processes and the DCI format 2_2 may include N ACK/NACK bits for N number of CG configurations.
  • a DCI format 2_2 message include a CRC scrambled with a transmission power control-physical uplink control channel-radio network temporary identifier (TPC-PUCCH-RNTI) or a transmission power control-physical uplink shared channel-radio network temporary identifier (TPC-PUSCH-RNTI) . Accordingly, if the UE is configured to monitor for ACK/NACK using DCI format 2_2, the UE may monitor ACK/NACK for a CG UL data transmission based on the TPC-PUCCH-RNTI or the TPC-PUSCH-RNTI.
  • TPC-PUCCH-RNTI transmission power control-physical uplink control channel-radio network temporary identifier
  • TPC-PUSCH-RNTI transmission power control-physical uplink shared channel-radio network temporary identifier
  • the BS may indicate an ACK//NACK for a CG UL transmission received over a licensed band using DCI format 2_2.
  • DCI format 2_2 can be used for indicating a transmit power control command (TPC) for physical uplink control channel (PUCCH) and/or physical uplink shared channel (PUSCH) transmissions.
  • TPC transmit power control command
  • PUCCH physical uplink control channel
  • PUSCH physical uplink shared channel
  • the BS may extend the DCI format 2_2 to include additional bits for indicating ACK/NACKs for CG UL transmissions.
  • a new DCI format (which may be referred to as a DCI format 2_7, a DCI format 2_X, or any other suitable DCI format) can be used to indicate the transmission status with different CG-UL configurations.
  • the BS may report N bits to indicate the transmission status of the CG-UL configurations allocated to the UE. In some aspects, if the number of CG-UL configurations for a UE is smaller than N, the BS may set the remaining bits to 0. In some other aspects, if the number of CG-UL configurations for a UE is larger than N, the N CG-UL configurations with smallest period may be selected. In some aspects, when a retransmission switch period is configured, the UE may use a different configured grant resource for the transmission of the next packet based on the switch period number and/or retransmission number. In some other aspects, if a retransmission switch period is not configured, the UE may use a different configured grant resource for the transmission of the next packet.
  • FIG. 1 illustrates a wireless communication network 100 according to some aspects of the present disclosure.
  • the network 100 may be a 5G network.
  • the network 100 includes a number of base stations (BSs) 105 (individually labeled as 105a, 105b, 105c, 105d, 105e, and 105f) and other network entities.
  • a BS 105 may be a station that communicates with UEs 115 and may also be referred to as an evolved node B (eNB) , a next generation eNB (gNB) , an access point, and the like.
  • eNB evolved node B
  • gNB next generation eNB
  • Each BS 105 may provide communication coverage for a particular geographic area.
  • the term “cell” can refer to this particular geographic coverage area of a BS 105 and/or a BS subsystem serving the coverage area, depending on the context in which the term is used.
  • a BS 105 may provide communication coverage for a macro cell or a small cell, such as a pico cell or a femto cell, and/or other types of cell.
  • a macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions with the network provider.
  • a small cell such as a pico cell, would generally cover a relatively smaller geographic area and may allow unrestricted access by UEs with service subscriptions with the network provider.
  • a small cell such as a femto cell, would also generally cover a relatively small geographic area (e.g., a home) and, in addition to unrestricted access, may also provide restricted access by UEs having an association with the femto cell (e.g., UEs in a closed subscriber group (CSG) , UEs for users in the home, and the like) .
  • a BS for a macro cell may be referred to as a macro BS.
  • a BS for a small cell may be referred to as a small cell BS, a pico BS, a femto BS or a home BS. In the example shown in FIG.
  • the BSs 105d and 105e may be regular macro BSs, while the BSs 105a-105c may be macro BSs enabled with one of three dimension (3D) , full dimension (FD) , or massive MIMO.
  • the BSs 105a-105c may take advantage of their higher dimension MIMO capabilities to exploit 3D beamforming in both elevation and azimuth beamforming to increase coverage and capacity.
  • the BS 105f may be a small cell BS which may be a home node or portable access point.
  • a BS 105 may support one or multiple (e.g., two, three, four, and the like) cells.
  • the network 100 may support synchronous or asynchronous operation.
  • the BSs may have similar frame timing, and transmissions from different BSs may be approximately aligned in time.
  • the BSs may have different frame timing, and transmissions from different BSs may not be aligned in time.
  • the UEs 115 are dispersed throughout the wireless network 100, and each UE 115 may be stationary or mobile.
  • a UE 115 may also be referred to as a terminal, a mobile station, a subscriber unit, a station, or the like.
  • a UE 115 may be a cellular phone, a personal digital assistant (PDA) , a wireless modem, a wireless communication device, a handheld device, a tablet computer, a laptop computer, a cordless phone, a wireless local loop (WLL) station, or the like.
  • PDA personal digital assistant
  • WLL wireless local loop
  • a UE 115 may be a device that includes a Universal Integrated Circuit Card (UICC) .
  • a UE may be a device that does not include a UICC.
  • UICC Universal Integrated Circuit Card
  • the UEs 115 that do not include UICCs may also be referred to as IoT devices or internet of everything (IoE) devices.
  • the UEs 115a-115d are examples of mobile smart phone-type devices accessing network 100.
  • a UE 115 may also be a machine specifically configured for connected communication, including machine type communication (MTC) , enhanced MTC (eMTC) , narrowband IoT (NB-IoT) and the like.
  • MTC machine type communication
  • eMTC enhanced MTC
  • NB-IoT narrowband IoT
  • the UEs 115e-115h are examples of various machines configured for communication that access the network 100.
  • the UEs 115i-115k are examples of vehicles equipped with wireless communication devices configured for communication that access the network 100.
  • a UE 115 may be able to communicate with any type of the BSs, whether macro BS, small cell, or the like.
  • a lightning bolt e.g., communication links indicates wireless transmissions between a UE 115 and a serving BS 105, which is a BS designated to serve the UE 115 on the downlink (DL) and/or uplink (UL) , desired transmission between BSs 105, backhaul transmissions between BSs, or sidelink transmissions between UEs 115.
  • the BSs 105a-105c may serve the UEs 115a and 115b using 3D beamforming and coordinated spatial techniques, such as coordinated multipoint (CoMP) or multi-connectivity.
  • the macro BS 105d may perform backhaul communications with the BSs 105a-105c, as well as small cell, the BS 105f.
  • the macro BS 105d may also transmits multicast services which are subscribed to and received by the UEs 115c and 115d.
  • Such multicast services may include mobile television or stream video, or may include other services for providing community information, such as weather emergencies or alerts, such as Amber alerts or gray alerts.
  • the BSs 105 may also communicate with a core network.
  • the core network may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions.
  • IP Internet Protocol
  • At least some of the BSs 105 (e.g., which may be an example of a gNB or an access node controller (ANC) ) may interface with the core network through backhaul links (e.g., NG-C, NG-U, etc. ) and may perform radio configuration and scheduling for communication with the UEs 115.
  • the BSs 105 may communicate, either directly or indirectly (e.g., through core network) , with each other over backhaul links (e.g., X1, X2, etc. ) , which may be wired or wireless communication links.
  • the network 100 may also support mission critical communications with ultra-reliable and redundant links for mission critical devices, such as the UE 115e, which may be a drone. Redundant communication links with the UE 115e may include links from the macro BSs 105d and 105e, as well as links from the small cell BS 105f.
  • UE 115f e.g., a thermometer
  • UE 115g e.g., smart meter
  • UE 115h e.g., wearable device
  • the network 100 may also provide additional network efficiency through dynamic, low-latency TDD/FDD communications, such asV2V, V2X, C-V2X communications between a UE 115i, 115j, or 115k and other UEs 115, and/or vehicle-to-infrastructure (V2I) communications between a UE 115i, 115j, or 115k and a BS 105.
  • V2V dynamic, low-latency TDD/FDD communications
  • V2X V2X
  • C-V2X C-V2X communications between a UE 115i, 115j, or 115k and other UEs 115
  • V2I vehicle-to-infrastructure
  • the network 100 utilizes OFDM-based waveforms for communications.
  • An OFDM-based system may partition the system BW into multiple (K) orthogonal subcarriers, which are also commonly referred to as subcarriers, tones, bins, or the like. Each subcarrier may be modulated with data.
  • the subcarrier spacing between adjacent subcarriers may be fixed, and the total number of subcarriers (K) may be dependent on the system BW.
  • the system BW may also be partitioned into subbands. In other instances, the subcarrier spacing and/or the duration of TTIs may be scalable.
  • the BSs 105 can assign or schedule transmission resources (e.g., in the form of time-frequency resource blocks (RB) ) for downlink (DL) and uplink (UL) transmissions in the network 100.
  • DL refers to the transmission direction from a BS 105 to a UE 115
  • UL refers to the transmission direction from a UE 115 to a BS 105.
  • the communication can be in the form of radio frames.
  • a radio frame may be divided into a plurality of subframes or slots, for example, about 10. Each slot may be further divided into mini-slots. In a FDD mode, simultaneous UL and DL transmissions may occur in different frequency bands.
  • each subframe includes a UL subframe in a UL frequency band and a DL subframe in a DL frequency band.
  • UL and DL transmissions occur at different time periods using the same frequency band.
  • a subset of the subframes (e.g., DL subframes) in a radio frame may be used for DL transmissions and another subset of the subframes (e.g., UL subframes) in the radio frame may be used for UL transmissions.
  • each DL or UL subframe may have pre-defined regions for transmissions of reference signals, control information, and data.
  • Reference signals are predetermined signals that facilitate the communications between the BSs 105 and the UEs 115.
  • a reference signal can have a particular pilot pattern or structure, where pilot tones may span across an operational BW or frequency band, each positioned at a pre-defined time and a pre-defined frequency.
  • a BS 105 may transmit cell specific reference signals (CRSs) and/or channel state information –reference signals (CSI-RSs) to enable a UE 115 to estimate a DL channel.
  • CRSs cell specific reference signals
  • CSI-RSs channel state information –reference signals
  • a UE 115 may transmit sounding reference signals (SRSs) to enable a BS 105 to estimate a UL channel.
  • Control information may include resource assignments and protocol controls.
  • Data may include protocol data and/or operational data.
  • the BSs 105 and the UEs 115 may communicate using self-contained subframes.
  • a self-contained subframe may include a portion for DL communication and a portion for UL communication.
  • a self-contained subframe can be DL-centric or UL-centric.
  • a DL-centric subframe may include a longer duration for DL communication than for UL communication.
  • a UL-centric subframe may include a longer duration for UL communication than for UL communication.
  • the network 100 may be an NR network deployed over a licensed spectrum.
  • the BSs 105 can transmit synchronization signals (e.g., including a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) ) in the network 100 to facilitate synchronization.
  • the BSs 105 can broadcast system information associated with the network 100 (e.g., including a master information block (MIB) , remaining system information (RMSI) , and other system information (OSI) ) to facilitate initial network access.
  • MIB master information block
  • RMSI remaining system information
  • OSI system information
  • the BSs 105 may broadcast the PSS, the SSS, and/or the MIB in the form of synchronization signal block (SSBs) over a physical broadcast channel (PBCH) and may broadcast the RMSI and/or the OSI over a physical downlink shared channel (PDSCH) .
  • PBCH physical broadcast channel
  • PDSCH physical downlink shared channel
  • a UE 115 attempting to access the network 100 may perform an initial cell search by detecting a PSS from a BS 105.
  • the PSS may enable synchronization of period timing and may indicate a physical layer identity value.
  • the UE 115 may then receive a SSS.
  • the SSS may enable radio frame synchronization, and may provide a cell identity value, which may be combined with the physical layer identity value to identify the cell.
  • the PSS and the SSS may be located in a central portion of a carrier or any suitable frequencies within the carrier.
  • the UE 115 may receive a MIB.
  • the MIB may include system information for initial network access and scheduling information for RMSI and/or OSI.
  • the UE 115 may receive RMSI and/or OSI.
  • the RMSI and/or OSI may include radio resource control (RRC) information related to random access channel (RACH) procedures, paging, control resource set (CORESET) for physical downlink control channel (PDCCH) monitoring, physical UL control channel (PUCCH) , physical UL shared channel (PUSCH) , power control, and SRS.
  • RRC radio resource control
  • the UE 115 can perform a random access procedure to establish a connection with the BS 105.
  • the random access procedure may be a four-step random access procedure.
  • the UE 115 may transmit a random access preamble and the BS 105 may respond with a random access response.
  • the random access response (RAR) may include a detected random access preamble identifier (ID) corresponding to the random access preamble, timing advance (TA) information, a UL grant, a temporary cell-radio network temporary identifier (C-RNTI) , and/or a backoff indicator.
  • ID detected random access preamble identifier
  • TA timing advance
  • C-RNTI temporary cell-radio network temporary identifier
  • the UE 115 may transmit a connection request to the BS 105 and the BS 105 may respond with a connection response.
  • the connection response may indicate a contention resolution.
  • the random access preamble, the RAR, the connection request, and the connection response can be referred to as message 1 (MSG1) , message 2 (MSG2) , message 3 (MSG3) , and message 4 (MSG4) , respectively.
  • the random access procedure may be a two-step random access procedure, where the UE 115 may transmit a random access preamble and a connection request in a single transmission and the BS 105 may respond by transmitting a random access response and a connection response in a single transmission.
  • the UE 115 and the BS 105 can enter a normal operation stage, where operational data may be exchanged.
  • the BS 105 may schedule the UE 115 for UL and/or DL communications.
  • the BS 105 may transmit UL and/or DL scheduling grants to the UE 115 via a PDCCH.
  • the scheduling grants may be transmitted in the form of DL control information (DCI) .
  • the BS 105 may transmit a DL communication signal (e.g., carrying data) to the UE 115 via a PDSCH according to a DL scheduling grant.
  • the UE 115 may transmit a UL communication signal to the BS 105 via a PUSCH and/or PUCCH according to a UL scheduling grant.
  • the BS 105 may communicate with a UE 115 using HARQ techniques to improve communication reliability, for example, to provide a URLLC service.
  • the BS 105 may schedule a UE 115 for a PDSCH communication by transmitting a DL grant in a PDCCH.
  • the BS 105 may transmit a DL data packet to the UE 115 according to the schedule in the PDSCH.
  • the DL data packet may be transmitted in the form of a transport block (TB) . If the UE 115 receives the DL data packet successfully, the UE 115 may transmit a HARQ ACK to the BS 105.
  • TB transport block
  • the UE 115 may transmit a HARQ NACK to the BS 105.
  • the BS 105 may retransmit the DL data packet to the UE 115.
  • the retransmission may include the same coded version of DL data as the initial transmission.
  • the retransmission may include a different coded version of the DL data than the initial transmission.
  • the UE 115 may apply soft-combining to combine the encoded data received from the initial transmission and the retransmission for decoding.
  • the BS 105 and the UE 115 may also apply HARQ for UL communications using substantially similar mechanisms as the DL HARQ.
  • the network 100 may operate over a system BW or a component carrier (CC) BW.
  • the network 100 may partition the system BW into multiple BWPs (e.g., portions) .
  • a BS 105 may dynamically assign a UE 115 to operate over a certain BWP (e.g., a certain portion of the system BW) .
  • the assigned BWP may be referred to as the active BWP.
  • the UE 115 may monitor the active BWP for signaling information from the BS 105.
  • the BS 105 may schedule the UE 115 for UL or DL communications in the active BWP.
  • a BS 105 may assign a pair of BWPs within the CC to a UE 115 for UL and DL communications.
  • the BWP pair may include one BWP for UL communications and one BWP for DL communications.
  • the networks 100 may operate over a licensed band.
  • a BS 105 may configure a UE 115 with configured grant resources for autonomous UL data transmission.
  • the configured grant resources may be repeated at a certain time interval.
  • the UE 115 may use the configured grant resources for UL HARQ data transmission without being scheduled dynamically by the BS 105.
  • Each configured grant resource may include a set of consecutive transmission slots or time periods.
  • the BS 105 may configure the UE with a set of redundancy version number (RVNs) .
  • RVNs redundancy version number
  • the UE 115 may determine an order for mapping the configured RVNs to the set of slots or transmission periods.
  • the UE 115 may transmit one or more redundancy versions of a TB in consecutive slots or time periods within a configured grant resource.
  • the UE 115 may also prioritize HARQ processes and/or TBs for transmissions in the configured grant resources.
  • the BS 105 may transmit a DCI message including an ACK/NACK for the uplink data.
  • the DCI message may include a bitmap indicating the ACK/NACK.
  • the DCI message may be a DCI format 0_1 message, where each bit in the bitmap may be associated with a particular UL HARQ process or UL HARQ ID at the UE 115.
  • the DCI message may indicate the ACK/NACK in a first bit in the bitmap, where the first bit is associated with a first HARQ process or a first HARQ ID associated with the UL data.
  • the DCI message may be a DCI format 2_2 message or a new DCI format message (e.g., a DCI format 2_7 message or a DCI format 2_X message) , where each bit in the bitmap may be associated with a particular configuration grant configuration and each configured grant configuration.
  • the DCI message may indicate the ACK/NACK in a first bit of the bitmap that is associated with a first configured grant configuration associated with the first configured grant resource.
  • the BS 105 may include a CRC scrambled with a CS-RNTI in a DCI format 0_1 message. Accordingly, if the UE 115 is configured to monitor a DCI format 0_1 message for an ACK/NACK of a CG UL HARQ transmission, the UE 115 may monitor for the ACK/NACK based on the CS-RNTI. In some aspects, the BS 105 may include a CRC scrambled with a TPC-PUCCH-RNTI or a TPC-PUSCH-RNTI in a DCI format 2_2 message.
  • the UE 115 may monitor for the ACK/NACK based on the TPC-PUCCH-RNTI or the TPC-PUSCH-RNTI.
  • the BS 105 may include a CRC scrambled with a DL feedback specific RNTI in a downlink feedback specific DCI format message (e.g., a DCI format 2_7 message or a DCI format 2_X message) .
  • the UE 115 may monitor for the ACK/NACK based on the DL feedback specific RNTI.
  • Mechanisms for communicating feedbacks for UL HARQ data transmissions that are transmitted using configured grant resources in a licensed frequency band are discussed in greater detail herein
  • FIG. 2 illustrates a radio frame structure 200 according to some aspects of the present disclosure.
  • the radio frame structure 200 may be employed by BSs such as the BSs 105 and UEs such as the UEs 115 in a network such as the network 100 for communications.
  • the x-axes represent time in some arbitrary units and the y-axes represent frequency in some arbitrary units.
  • the transmission frame structure 200 includes a radio frame 201.
  • the duration of the radio frame 201 may vary depending on the aspects. In an example, the radio frame 201 may have a duration of about ten milliseconds.
  • the radio frame 201 includes M number of slots 202, where M may be any suitable positive integer. In an example, M may be about 10.
  • Each slot 202 includes a number of subcarriers 204 in frequency and a number of symbols 206 in time.
  • the number of subcarriers 204 and/or the number of symbols 206 in a slot 202 may vary depending on the aspects, for example, based on the channel bandwidth, the subcarrier spacing (SCS) , and/or the CP mode.
  • One subcarrier 204 in frequency and one symbol 206 in time forms one resource element (RE) 212 for transmission.
  • a resource block (RB) 210 is formed from a number of consecutive subcarriers 204 in frequency and one or more consecutive symbols 206 in time. In NR, a RB 210 is defined as twelve consecutive subcarriers 204 in a frequency domain.
  • a BS may schedule a UE (e.g., UE 115 in FIG. 1) for UL and/or DL communications at a time-granularity of slots 202 or mini-slots 208.
  • Each slot 202 may be time-partitioned into K number of mini-slots 208.
  • Each mini-slot 208 may include one or more symbols 206.
  • the mini-slots 208 in a slot 202 may have variable lengths. For example, when a slot 202 includes N number of symbols 206, a mini-slot 208 may have a length between one symbol 206 and (N-1) symbols 206.
  • a mini-slot 208 may have a length of about two symbols 206, about four symbols 206, or about seven symbols 206.
  • the BS may schedule UE at a frequency-granularity of a resource block (RB) 210 (e.g., including about 12 subcarriers 204) .
  • RB resource block
  • FIG. 3 illustrates a HARQ communication scenario 300 according to some aspects of the present disclosure.
  • the scenario 300 may correspond to a HARQ communication scenario in the network 100 when the network 100 operates over a licensed or unshared frequency band or over a shared or unlicensed frequency band.
  • the x-axis represents time in some constant units.
  • a BS 105 similar to the BSs 105 may communicate data with a UE 115 similar to the UEs 115 using HARQ over a frequency band 302, which may be a licensed or unshared frequency band or a shared or unlicensed frequency band shared by multiple network operating entities.
  • the frequency band 302 may be located at any suitable frequencies. In some aspects, the frequency band 302 may be located at about 3.5 GHz, 6 GHz, or 30 GHz.
  • a transmitting node may transmit data (e.g., in the form of a transport block (TB) ) to a receiving node (e.g., the BS 105) .
  • the receiving node may provide the transmitting node with a feedback on the reception status of the data. For example, the receiving node may transmit an ACK to the transmitting node to indicate a successful decoding of the data. Conversely, the receiving node may transmit a NACK to the transmitting node to indicate a decoding failure for the data.
  • the transmitting node may transmit new data in a subsequent transmission.
  • the transmitting node may retransmit the same data to the receiving node.
  • the transmitting node may use the same encoding version for the initial transmission and the retransmission.
  • the transmitting node may use different encoding versions for the initial transmission and the retransmission.
  • the encoding versions may be referred to as redundancy versions. Different redundancy versions may include different combinations of systematic data information bits and error correction bit.
  • the receiving node may perform soft-combining to decode the data based on the initial transmission and the retransmission.
  • FIG. 3 illustrates the HARQ communication in the context of UL data communications, though similar HARQ mechanisms may be applied to DL data communications.
  • the UE 115 includes a HARQ component 320.
  • the HARQ component 320 is configured to perform multiple parallel HARQ processes 322 for UL data communications.
  • the HARQ processes 322 may operate independent of each other. In other words, the ACKs, NACKs, and/or retransmissions are determined and processed separately for each HARQ process 322 at the BS 105 and at the UE 115.
  • Each HARQ process 322 may be identified by a HARQ process identifier (ID) .
  • ID HARQ process identifier
  • the HARQ processes 322 may be identified by identifiers H1, H2, ...Hn.
  • Each HARQ process 322 may have one or more TBs ready for transmission. In the illustrated example of FIG.
  • the HARQ process H1 322 has one TB 330 ready for transmission and the HARQ process H2 322 has one TB 332 ready for transmission.
  • the BS 105 may configure the UE 115 with configured grant resources within a licensed band.
  • the UE 115 may transmit the TB 330 and the TB 232 to the BS 105 using a configured grant resource.
  • the BS 105 may configure the UE 115 with a configured grant resource 340.
  • the configured grant resource 340 may be periodic. For instance, the configured grant resource 340 may repeated at a time interval 342.
  • the configured grant resource 340 may be partitioned into a plurality transmission time periods or slots 306. Each slot 306 may include any suitable number of OFDM symbols depending on the transmission configurations or numerology (e.g., the subcarrier spacing (SCS) and/or the cyclic prefix (CP) mode) in use.
  • SCS subcarrier spacing
  • CP cyclic prefix
  • the frequency band 302 may be an unlicensed band or a shared frequency band shared by multiple network operating entities. Accordingly, the UE 115 may perform an LBT 350 in the frequency band 302 prior to a transmission. As an example, a first LBT 350 attempt for a transmission in a second slot 306 within the configured grant resource 340 failed (shown by the cross symbol) . A second LBT 350 attempt for a transmission in a third slot 306 within the configured grant resource 340 also failed (shown by the cross symbol) . A third LBT attempt for a transmission in a fourth slot 306 within the configured grant resource 340 is a pass. Thus, the UE 115 may initiate a transmission beginning at the fourth slot 306. Once the UE 115 won a contention (e.g., passing the LBT 350) , the UE 115 may use the configured grant resource for a number of consecutive HARQ transmissions.
  • a contention e.g., passing the LBT 350
  • the UE 115 transmits four repetitions of the TB 330, denoted as TB A, followed by two repetitions of the TB 332, denoted as TB B, in consecutive slots 306 (e.g., the slots 202) .
  • the UE 115 may transmit the repetitions for the TB 330 using different redundancy versions and/or the same redundancy versions.
  • each repetition may use a different RVN.
  • all repetitions may use the same RVN.
  • at least two repetitions may use the same RVN.
  • the UE 115 may transmit the repetitions for the TB 332 using different redundancy versions and/or the same redundancy versions.
  • the UE 115 may include a RVN and/or a HARQ ID for each transmission, for example, in uplink control information (UCI) 360.
  • the RVN may indicate a RV0, a RV1, a RV2, a RV3, a RV4, and so on.
  • Each transmission for the TB A 330 may include UCI 360 indicating a HARQ ID H1.
  • each transmission for the TB B 332 may include UCI 360 indicating a HARQ ID H2.
  • the UE 115 may further indicate whether a transmission is an initial transmission or a retransmission by including a new data indicator (NDI) in the UCI 360.
  • NDI new data indicator
  • the NDI may be set to a value of 1 to indicate that a corresponding transmission is an initial transmission and may be set to a value of 0 to indicate that a corresponding transmission is a retransmission.
  • the UCI 360 for each transmission of the TB A 330 may include a NDI with a value of 1 to indicate that the repetitions of the TB A 330 are associated with an in initial transmissions of the TB A 330.
  • the UCI 360 for each transmission of the TB B 332 may include a NDI with a value of 0 to indicate that the repetitions of the TB B 332 are associated with a retransmission of the TB B 332.
  • the UE 115 may determine a RV sequence (e.g., a sequence of RVNs) for transmitting one or more redundancy versions of a TB in a configured grant resource and/or how to prioritize transmission of one TB of a certain HARQ process 322 over another TB of another HARQ process 322 without assistance from the BS 105.
  • the BS 105 may provide the UE with some assistance in the RV sequence determination and/or HARQ ID selection.
  • the frequency band 302 may be a licensed band. As such, the LBT 350 is not necessary.
  • the BS 105 may configure the UE 115 with the configured grant resources 340 (e.g., a type 2 CG configuration via RRC) , and the UE 115 may perform the UL HARQ data transmissions (e.g., the TB A 330, 332) based on the type 2 CG configuration.
  • each type 2 CG configuration may be configured for a particular UL HARQ process at the UE 115, and the UE 115 may transmit UL data of a HARQ process in the configured grant resources 340 according to a configuration of the configured grant resources 340.
  • the BS 105 may transmit DCI (e.g., DCI format 0_1) to activate the configured grant resources 340, and UE 115 may perform the UL HARQ data transmissions in response to the activation.
  • DCI e.g., DCI format 0_1
  • FIG. 4 illustrates an uplink configured grant re-transmission scenario 400 according to some aspects of the present disclosure.
  • the scenario 400 can include an UL frame structure 406 that may be employed by a UE (such as UE 115) for the transmission of data to a BS (such as BS 105, 105) in a network (such as the network 100) using configured grant resources.
  • the frame structure 406 may include multiple radio frames 201.
  • the x-axis represents time in some arbitrary units.
  • the frame structure 406 may be employed in conjunction with radio frame structure 200.
  • the frame structure 406 can include a plurality of slots 408 (e.g., the slots 202) .
  • the BS e.g., BS 105) can configure the UE (e.g., the UE 115) via the RRC signaling for the transmission of UL data in a licensed or unlicensed frequency band during a RRC configuration period.
  • a CG-UL configuration 410 may configure time domain resources, which may be referred to as configured grant resources (shown by the pattern-filled boxes with a checkered pattern) for the UE, including periodicity of configured grant resources, offset, start symbol, length of UL data, and/or the number of data transmission.
  • the BS may activate the configured grant resources via PDCCH during an activation period.
  • a CG-UL activation 420 may be transmitted to the UE.
  • the CG-UL activation 420 may activate a CG-resource as shown by the arrow 422.
  • the CG-UL activation 420 is transmitted to the UE via a DCI message.
  • the configured grant may be activated via RRC such that the CG-UL activation 420 is transmitted via RRC signaling. While an entire slot 408 is pattern-filled for the CG resources, in aspects, a CG resource may occur only in a corresponding portion of the slot 408.
  • the UE may transmit a data packet to the BS over the PUSCH during an initial transmission period using one of the configured grant resources. For instances, as shown in FIG. 4, the UE may transmit a CG-UL transmission 430 to the BS using the configured grant resource.
  • the CG-UL transmission 430 may use one or more aspects of the HARQ scenario 300 described in FIG. 3.
  • the BS may use a decoding algorithm (e.g., MLSE) to decode the received data.
  • MLSE a decoding algorithm
  • the BS may not provide a feedback to the UE.
  • the BS may schedule the UE for a retransmission by transmitting a dynamic UL grant.
  • a dynamic UL grant 440 may be transmitted to the UE.
  • the dynamic UL grant 440 may schedule an UL resource (shown by the pattern-filled box with a vertical stripe pattern) While an entire slot 408 is pattern-filled for the scheduled resource, in aspects, a scheduled resource may occur only in a corresponding portion of the slot 408.
  • the dynamic UL grant 440 is transmitted to the UE via a DCI message.
  • the UE may retransmit the same data from the CG-UL transmission 430 in response to receiving the dynamic UL grant 440. For instance, as shown in FIG. 4, the UE can make a retransmission 450 of the same uplink data initially transmitted as CG-UL transmission 430. While the BS can utilize a dynamic UL scheduling grant to schedule the UE for a retransmission upon a CG-UL data decoding error, it may not be necessary for the BS to allocate a new resource for the retransmission as the UE is already configured with multiple configured grant resources.
  • the present disclosure provides techniques for a BS to provide a UE with feedbacks for CG-UL data transmissions in a licensed band and for a UE to utilize a subsequent configured grant resource for a retransmission upon receiving a NACK for a CG-UL data transmission instead of relying on a new dynamic UL scheduling grant as shown in FIG. 4.
  • FIG. 5 illustrates an uplink configured grant re-transmission scenario 500 according to some aspects of the present disclosure.
  • the scenario 500 can include an UL frame structure 506 that may be employed by UEs (such as UE 115) for the transmission of data to a BS (such as BS 105) in a network (such as the network 100) using configured grant resources.
  • the frame structure 506 may include multiple radio frames 201.
  • the x-axis represents time in some arbitrary units.
  • the frame structure 506 may be employed in conjunction with radio frame structure 200.
  • the frame structure 506 can include a plurality of slots 508 (e.g., the slots 202 and 408) .
  • the BS e.g., BS 105
  • a CG-UL configuration 510 may configure time domain resources, which may be referred to as configured grant resources (shown by the pattern-filled boxes with a checkered pattern) , for the UE, including periodicity of configured grant resources, offset, start symbol, length of UL data, and/or the number of data transmission.
  • the BS may activate the configured grant resources via PDCCH during an activation period.
  • a CG-UL activation 520 may be transmitted to the UE.
  • the CG-UL activation 520 may activate a CG-resource as shown by the arrow 522.
  • the CG-UL activation 520 is transmitted to the UE via a DCI message.
  • the configured grant may be activated via RRC such that the CG-UL activation 520 is transmitted via RRC signaling. While an entire slot 508 is pattern-filled for the configured grant resources, in aspects, a configured grant resource may occur only in a corresponding portion of the slot 508.
  • the UE may transmit a data packet to the BS over the PUSCH during the initial transmission period using one of the configured grant resources and the CG-UL activation 520. For instance, as shown in FIG. 5, the UE may transmit a CG-UL transmission 530 using the configured grant resources. The CG-UL transmission 530 to the BS using the configured grant resources. The CG-UL transmission 530 may use one or more aspects of HARQ configuration 300 described in FIG. 3. When the BS receives the CG-UL transmission 530, the BS may use a decoding algorithm (e.g., MLSE) to decode the received data.
  • a decoding algorithm e.g., MLSE
  • the BS may provide an ACK feedback 540 to the UE.
  • the UE may provide a NACK feedback 540 to the UE.
  • the ACK/NACK feedback 540 may be transmitted to the UE via a DCI message.
  • the UE may retransmit the same data from the CG-UL transmission 530 in a subsequent configured grant resource in response to receiving the NACK feedback 540. For instance, as shown in FIG. 5, the UE can make a retransmission 550 of the same uplink data initially transmitted as CG-UL transmission 530.
  • the retransmission 550 differ from the retransmission 450 of FIG. 4 in that the retransmission 550 is also a CG transmission and not a dynamically scheduled retransmission.
  • FIG. 6 is a sequence diagram illustrating a communication method 600 between BS 105 and the UE 115 according to some aspects of the present disclosure.
  • the method 600 may employ similar mechanisms as discussed above in relation to FIGS. 3, 4, and 5.
  • the UE 115 may utilize one or more components, such as the processor 1002, the memory 1004, the HARQ module 1008, the transceiver 1010, the modem 1012, and the one or more antennas 1016 of FIG. 10, to execute the steps of method 600.
  • the BS 105 may utilize one or more components, such as the processor 1102, the memory 1104, the HARQ module 1108, the transceiver 1110, the modem 1112, and the one or more antennas 1116 of FIG. 11, to execute the steps of method 600.
  • the method 600 includes a number of enumerated actions, but aspects of the method 600 may include additional actions before, after, and in between the enumerated actions. In some aspects, one or more of the enumerated actions may be omitted or performed in a different order.
  • the BS 105 may configure UE 115 with a CG-UL grant via RRC signaling as discussed in relation to FIG. 4.
  • the CG-UL grant may indicate a set of configured grant resource (e.g., having a certain periodicity) , for example, as shown by the pattern-filled boxes with the checkered pattern in FIGS. 4 and 5.
  • the BS 105 may activate the configured grant resource grant via PDCCH.
  • the resource activation may be performed via DCI signaling.
  • the UE 115 may transmit a data packet in the configured grant resources on PUSCH as described in FIGS. 4 and 5. In some aspects, the UE may transmit the data packet in PUSCH.
  • the BS 105 decodes the packet, generates an ACK or NACK signal depending on whether the data packet is correctly or incorrectly decoded, and transmit the ACK/NACK feedback to the UE 115. For instance, the BS 105 may transmit an ACK feedback when the decoding is successful. Alternatively, the BS 105 may transmit a NACK feedback when the decoding is unsuccessful. In some aspect the BS may transmits the ACK/NACK signal in a one of the DCI messages in a PDCCH.
  • the UE 115 processes the ACK/NACK from the BS. If the UE determines an ACK is received, then the UE determines that the UL data was successfully received and decoded by the BS. If the UE determines an NACK is received, then the UE can determine to retransmit the UL data initially transmitted at 530.
  • the UE 115 may retransmit the data packet in a next configured grant resource based on the CG-UL grant if it receives the NACK signal from the BS 105. In some aspects, the UE 115 may re-transmit the data packet in PUSCH. If the retransmission also fails at the BS 105, the BS may repeat the step of 640 to cause the UE 115 to perform another retransmission as shown by the dashed arrow 670. The retransmission may continue until the BS 105 receives the data packet correctly or when a retransmission timeout is reached or when a maximum number of retransmission is reached.
  • FIG. 7 illustrates a downlink control information message structure 700 according to some aspects of the present disclosure.
  • the downlink control information message structure 700 may be used for UL resource allocation. In some instances, the downlink control information message structure 700 may be used for the scheduling of one or multiple PUSCH in a cell. In some other instances, the downlink control information message structure 700 may be used for indicating CG-DFI to a UE.
  • the BS 105 may transmit the ACK/NACK 540 of FIG. 5 or the ACK/NACK at 640 of FIG. 6 using the downlink control information message structure 700. Accordingly, the UE 115 may receive the ACK/NACK 540 of FIG. 5 or the ACK/NACK at 640 of FIG. 6 according to the downlink control information message structure 700.
  • the downlink control information message structure 700 may have DCI message format 0_1.
  • the downlink control information message structure 700 may include an identifier 710, a carrier indicator 720, a DFI flag 730, a TPC 740, and a HARQ bitmap 750.
  • the downlink control information message structure 700 may include a CRC scrambled by C-RNTI, CS-RNTI, MCS-RNTI or SP_CS-RNTI.
  • the downlink control information message structure 600 may include a CRC scrambled by CS-RNTI.
  • the identifier 710 can indicate that the DCI message is an UL DCI format. In some instances, the identifier 710 is a single bit. In some instances, the value of the identifier 710 bit is set to 0 to indicate the DCI message is an UL DCI message format.
  • the carrier indicator 720 can indicate parameters associated with cross-carrier scheduling. In some aspects, if cross-carrier scheduling is not configured, then the carrier indicator 720 can be a one-bit field. In some aspects, if the cross-carrier scheduling is configured, then the carrier indicator 620 can be a three-bit field.
  • the DFI flag 730 can provide an indication to the UE whether CG type is activated.
  • the DFI flag 730 can also provide an indication to the UE that the DCI message is a CG-DFI message.
  • the DFI flag 730 is a single bit.
  • the DFI flag 730 can be set to 1 to indicate the activation of CG type 2.
  • the DFI flag 730 can be set to 0 to indicate the DCI message is a CG-DFI message.
  • the TPC 740 can be used to control PUSCH transmit power.
  • the TPC can be used to adjust the UE power according to the path loss in the link between the UE and the BS such that the BS can successfully receive and decode the transmitted data packet from the UE correctly.
  • the TPC 740 is a two-bit field.
  • the HARQ bit map 750 can be utilized to provide feedback to the UE.
  • each bit (750a, 750b, 750c, ...750n) of the HARQ bit map 750 can indicate an ACK or NACK signal for a corresponding HARQ process.
  • the value 1 may indicate ACK and the value 0 may indicate NACK (or vice versa) .
  • the bits of the HARQ bit map 750 may be mapped to HARQ process IDs.
  • FIG. 7, illustrates an approach where the HARQ IDs are in ascending order (e.g., from MSB to LSB) .
  • aspects of the HARQ processes 322 described in FIG. 3 may be used in the context of the HARQ bitmap 750 configuration.
  • FIG. 8 illustrates a downlink control information message structure 800 according to some aspects of the present disclosure.
  • the downlink control information message structure 800 may be used for the transmission of ACK/NACK signals and/or TPC commands to the UE.
  • the BS 105 may transmit the ACK/NACK 540 of FIG. 5 or the ACK/NACK at 640 of FIG. 6 using the downlink control information message structure 800.
  • the UE 115 may receive the ACK/NACK 540 of FIG. 5 or the ACK/NACK at 640 of FIG. 6 according to the downlink control information message structure 800.
  • the downlink control information message structure 800 may have DCI message format 2_2.
  • downlink control information message structure 800 may include a plurality of blocks 810.
  • the downlink control information message structure 800 may also include a CRC scrambled by TPC-PUCCH-RNTI or TPC-PUSCH-RNTI.
  • Each block 810 may include a closed loop indicator 820, a TPC 830, and an ACK/NACK bitmap 840.
  • each block 810 may be assigned to a different UE (e.g., the UEs 115) .
  • the BS may configure each UE with a DCI block assignment indicating which block of bits within a DCI message is designated for the UE.
  • the BS may configure the DCI block assignment via RRC signaling.
  • the DCI block assignment may indicate a block index and/or a block length (e.g., number of DCI bits) .
  • the closed loop indicator 820 can indicate closed loop power control. In some aspects, if the UE is configured with higher layer parameter twoPUSCH-PC_AdjustmentStates, the closed loop indicator 820 can be a one-bit field. In some aspects, if the UE is configured with higher layer parameter twoPUCCH-PC_AdjustmentStates, the closed loop indicator 820 can be a one-bit field.
  • the close loop indicator 820 may include information associated with UL transmit power control.
  • the TPC 830 indicates TPC to the UE.
  • the UE may either increase or decrease its PUSCH /PUCCH power as instructed by the BS via bits the 830 (830a, 830b) .
  • the TPC can be a 2-bit field.
  • the ACK/NCK bits 840 indicates ACK/NACK feedback signals from the UE to the BS.
  • the ACK/NACK bits 840 can be a N-bit field, where N is a positive integer and each bit in the ACK/NACK bits 840 is associated with one CG-UL configuration at the UE.
  • the BS may configure the UE with multiple CG-UL configurations, each including a periodic configured grant resource and associated with a HARQ process at the UE.
  • each bit in the ACK/NACK bits 840 may correspond to one of the N number of CG-UL configurations.
  • the BS may generate an ACK/NACK signal for a data packet of a HARQ process received in a configured grant resource and indicate the ACK/NACK signal in a bit corresponding to a CG-UL configuration that configured the configured grant resource.
  • the BS may configure the UE with more than N CG-UL configurations. If the number of CG-UL configurations at the UE is M, where M is greater than N, the BS may select the N CG-UL with the shortest periods among the M CG-UL configurations, and transmits ACK/NACK signals only for those CG-UL in the ACK/NACK bits 840.
  • the CG-UL configurations with the shorter periodicities may correspond to traffic or transmissions that are more time sensitive or have a lower latency than CG-UL configurations with long periodicities.
  • the BS may give priority to feedbacks associated with CG-UL configurations that are more time sensitive or have a lower latency.
  • the BS may set the remaining bits of ACK/NACK bits 840 which are not associated with any CG-UL configurations to zero.
  • the UE may disregard the remaining (N-M) bits.
  • the downlink control information message structure 800 may include less fields or more fields than as shown in FIG. 8.
  • the downlink control information message structure 800 may include at least the TPC 830 and one or more ACK/NACK bits 840 in a block 810 for a UE when the BS includes an ACK/NACK to the UE in the DCI message.
  • FIG. 9 illustrates a downlink control information message structure 900 according to some aspects of the present disclosure.
  • the downlink control information message structure 900 may be used for the transmission of ACK/NACK to the UE.
  • the BS 105 may transmit the ACK/NACK 540 of FIG. 5 or the ACK/NACK at 640 of FIG. 6 using the downlink control information message structure 900.
  • the UE 115 may receive the ACK/NACK 540 of FIG. 5 or the ACK/NACK at 640 of FIG. 6 according to the downlink control information message structure 900.
  • the downlink control information message structure 900 is a new DCI message structure specific to ACK/NACK feedback for CG-UL transmissions, for example, in a licensed band.
  • the downlink control information message structure 900 may have a DCI format 2_X.
  • the downlink control information message structure 900 may have any suitable DCI format that is not currently being used for other signaling purposes.
  • downlink control information message structure 900 may include a plurality of blocks 910.
  • the downlink control information message structure 900 may also include a CRC scrambled by a RNTI specific for feedback for CG-UL transmissions.
  • Each block 910 may include an ACK/NACK field 930.
  • each block 910 may be assigned to a different UE (e.g., the UEs 115) .
  • the BS may configure each UE with a DCI block assignment indicating which block of bits within a DCI message is designated for the UE.
  • the BS may configure the DCI block assignment via RRC signaling.
  • the DCI block assignment may indicate a block index and/or a block length (e.g., number of DCI bits) .
  • each block 910 may be identified by a block index or block number (e.g., block number 1, block number 2, ..., block number N) .
  • the BS may send to the UE a parameter (e.g., a block index or block number) , which may be referred to as a downlinkfeedbackinformation-r17, via RRC signaling, to enable the UE which block 910 within the DCI message in assigned to the UE.
  • a parameter e.g., a block index or block number
  • RRC signaling to enable the UE which block 910 within the DCI message in assigned to the UE.
  • the ACK/NACK bits 930 (shown as 930a, 930b, 930c, and 930d) indicate ACK/NACK feedback signals from the BS to the UE.
  • the ACK/NACK bits 840 can be a N-bit field, where N is a positive integer and each bit in the ACK/NACK bits 840 is associated with one CG-UL configuration at the UE.
  • the BS may configure the UE with multiple CG-UL configurations, each including a periodic configured grant resource and associated with a HARQ process at the UE.
  • each bit in the ACK/NACK bits 840 may correspond to one of the N number of CG-UL configurations.
  • the BS may generate an ACK/NACK signal for a data packet of a HARQ process received in a configured grant resource and indicate the ACK/NACK signal in a bit corresponding to a CG-UL configuration that configured the configured grant resource.
  • the BS may configure the UE with more than N CG-UL configurations.
  • the BS may select the N CG-UL with the shortest periods among the M CG-UL configurations, and transmits ACK/NACK signals only for those CG-UL in the ACK/NACK bits 840.
  • the CG-UL configurations with the shorter periodicities may correspond to traffic or transmissions that are more time sensitive or have a lower latency than CG-UL configurations with long periodicities.
  • the BS may give priority to feedbacks associated with CG-UL configurations that are more time sensitive or have a lower latency.
  • the BS may set the remaining bits of ACK/NACK bits 840 which are not associated with any CG-UL configurations to zero.
  • the UE may disregard the remaining (N-M) bits.
  • a UE may switch to use a different resource (e.g., a different frequency resource) for retransmitting CG-UL data that the BS fails to receive and/or decode, for example, due to interference impacting a certain frequency.
  • the retransmission can use a different RB/start-length-indicator-value (SLIV) assignment associated with a CG-UL configuration that configured a configured grant resource for an initial CG-UL transmission or a previous CG-UL transmission of a data packet.
  • SLIV start-length-indicator-value
  • the UE may retransmit a CG-UL transmission (of a certain HARQ process) using a frequency resource starting at a different frequency location and/or with a different frequency length/BW than a configured grant resource used for an initial CG-UL transmission (of the certain HARQ process) or a previous CG-UL transmission (of the certain HARQ process) .
  • the BS may configure the UE with a retransmission switch period for switching to a different frequency resource for a retransmission.
  • the retransmission switch period may indicate a number of retransmissions. If a retransmission switch period is configured at the UE, the UE may retransmit the CG-UL transmission (of the certain HARQ process) using a different frequency resource (RB/SLIV) associated with the CG-UL configuration for the certain HARQ process when the number of retransmissions for the CG-UL transmission (of the certain HARQ process) meets the retransmission switch period. For instance, upon receiving a DCI message (of FIG. 8 or FIG.
  • the UE may determine whether to retransmit the CG-UL transmission based on the same RB/SLIV assignment or a different RB/SLIV assignment of the CG-UL configuration based on a number of retransmissions associated with the CG-UL transmission. For instance, the UE may retransmit the CG-UL transmission in a second configured grant resource based on a different RB/SLIV assignment of the first CG-UL configuration when the number of retransmissions satisfies the retransmission switch period.
  • the BS may not configure the UE with a retransmission switch period. If a retransmission switch period is not configured at the UE, the UE may automatically or autonomously use a different RB/SLIV assignment associated with the CG-UL configuration for a next retransmission of the CG-UL transmission. For instance, upon receiving a DCI message (of FIG. 8 or FIG.
  • the UE may retransmit the CG-UL transmission in a second configured grant resource based on a second RB/SLIV assignment of the CG-UL configuration, where the second RB/SLIV assignment is different from the first RB/SLIV assignment.
  • FIG. 10 is a block diagram of an exemplary UE 1000 according to some aspects of the present disclosure.
  • the UE 1000 may be a UE 115 as discussed above in FIGS. 1, 3, and 6.
  • the UE 1000 may include a processor 1002, a memory 1004, a HARQ module 1008, a transceiver 1010 including a modem subsystem 1012 and a radio frequency (RF) unit 1014, and one or more antennas 1016.
  • RF radio frequency
  • the processor 1002 may include a central processing unit (CPU) , a digital signal processor (DSP) , an application specific integrated circuit (ASIC) , a controller, a field programmable gate array (FPGA) device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein.
  • the processor 1002 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.
  • the memory 1004 may include a cache memory (e.g., a cache memory of the processor 1002) , random access memory (RAM) , magnetoresistive RAM (MRAM) , read-only memory (ROM) , programmable read-only memory (PROM) , erasable programmable read only memory (EPROM) , electrically erasable programmable read only memory (EEPROM) , flash memory, solid state memory device, hard disk drives, other forms of volatile and non-volatile memory, or a combination of different types of memory.
  • the memory 1004 includes a non-transitory computer-readable medium.
  • the memory 1004 may store, or have recorded thereon, instructions 1006.
  • the instructions 1006 may include instructions that, when executed by the processor 1002, cause the processor 1002 to perform the operations described herein with reference to the UEs 115, 115 in connection with aspects of the present disclosure, for example, aspects of FIGS. 2-9 and 12. Instructions 1006 may also be referred to as program code.
  • the program code may be for causing a wireless communication device to perform these operations, for example by causing one or more processors (such as processor 1002) to control or command the wireless communication device to do so.
  • the terms “instructions” and “code” should be interpreted broadly to include any type of computer-readable statement (s) .
  • the terms “instructions” and “code” may refer to one or more programs, routines, sub-routines, functions, procedures, etc. “Instructions” and “code” may include a single computer-readable statement or many computer-readable statements.
  • the HARQ module 1008 may be implemented via hardware, software, or combinations thereof.
  • the HARQ module 1008 may be implemented as a processor, circuit, and/or instructions 1006 stored in the memory 1004 and executed by the processor 1002.
  • the HARQ module 1008 can be integrated within the modem subsystem 1012.
  • the HARQ module 1008 can be implemented by a combination of software components (e.g., executed by a DSP or a general processor) and hardware components (e.g., logic gates and circuitry) within the modem subsystem 1012.
  • the HARQ module 1008 may communicate with one or more components of BS 1100 to implement various aspects of the present disclosure, for example, aspects of FIGS. 2-9 and 12.
  • the HARQ module 1008 is configured to transmit, to a BS (e.g., the BSs 105) in a first configured grant resource within a licensed radio frequency band, uplink data in a first configured grant transmission.
  • the HARQ module 1008 is further configured to receive, from the BS in the licensed radio frequency band, a DCI message including an ACK/NACK feedback for the uplink data.
  • the DCI message may have a message structure as discussed above in relation to FIG. 7.
  • the DCI message may include a ACK/NACK bitmap, where each bit is associated with a HARQ process (identified by a HARQ ID) at the UE 1000, and the DCI message may indicate the ACK/NACK feedback in a first bit of the ACK/NACK bitmap based on the first bit being corresponding to a HARQ ID associated with the uplink data.
  • the DCI message may have a message structure as discussed above in relation to FIG. 8 or 9.
  • the DCI message may include a ACK/NACK bitmap, where each bit is associated with a configured grant configuration or CG-UL configuration at the UE 1000, and the DCI message may indicate the ACK/NACK feedback in a first bit of the ACK/NACK bitmap based on the first bit being corresponding to a configured grant configuration that configured the first configured grant resource.
  • the transceiver 1010 may include the modem subsystem 1012 and the RF unit 1014.
  • the transceiver 1010 can be configured to communicate bi-directionally with other devices, such as the BSs 105, 105.
  • the modem subsystem 1012 may be configured to modulate and/or encode the data from the memory 1004 and/or the HARQ module 1008 according to a modulation and coding scheme (MCS) , e.g., a low-density parity check (LDPC) coding scheme, a turbo coding scheme, a convolutional coding scheme, a digital beamforming scheme, etc.
  • MCS modulation and coding scheme
  • LDPC low-density parity check
  • the RF unit 1014 may be configured to process (e.g., perform analog to digital conversion or digital to analog conversion, etc.
  • modulated/encoded data e.g., PUSCH data, UCI, UL HARQ data block
  • modulated/encoded data e.g., PUSCH data, UCI, UL HARQ data block
  • the RF unit 1014 may be further configured to perform analog beamforming in conjunction with the digital beamforming.
  • the modem subsystem 1012 and the RF unit 1014 may be separate devices that are coupled together at the UE 115, 115 to enable the UE 115, 115 to communicate with other devices.
  • the RF unit 1014 may provide the modulated and/or processed data, e.g. data packets (or, more generally, data messages that may contain one or more data packets and other information) , to the antennas 1016 for transmission to one or more other devices.
  • the antennas 1016 may further receive data messages transmitted from other devices.
  • the antennas 1016 may provide the received data messages for processing and/or demodulation at the transceiver 1010.
  • the transceiver 1010 may provide the demodulated and decoded data (e.g., configured grants, RRC configurations, DCI messages, DCI format 0_1, DCI format 2_2, DL feedback specific DCI format, HARQ ACK/ACK) to the HARQ module 1008 for processing.
  • the antennas 1016 may include multiple antennas of similar or different designs in order to sustain multiple transmission links.
  • the transceiver 1010 is configured to communicate with one or more components of the UE 1000 to transmit, to a BS (e.g., the BS 105) , in a first configured grant resource within a licensed radio frequency band, uplink data in a first configured grant transmission, and receive, from the BS in the licensed radio frequency band, a DCI message including an ACK/NACK feedback for the uplink data.
  • a BS e.g., the BS 105
  • a DCI message including an ACK/NACK feedback for the uplink data.
  • the UE 1000 can include multiple transceivers 1010 implementing different RATs (e.g., NR and LTE) .
  • the UE 1000 can include a single transceiver 1010 implementing multiple RATs (e.g., NR and LTE) .
  • the transceiver 1010 can include various components, where different combinations of components can implement different RATs.
  • FIG. 11 is a block diagram of an exemplary BS 1100 according to some aspects of the present disclosure.
  • the BS 1100 may be a BS 105 as discussed above in FIGS. 1, 3, and 5.
  • the BS 1100 may include a processor 1102, a memory 1104, a configuration module 1108, a HARQ module 11008, a transceiver 1110 including a modem subsystem 1112 and a RF unit 1114, and one or more antennas 1116. These elements may be in direct or indirect communication with each other, for example via one or more buses.
  • the processor 1102 may have various features as a specific-type processor. For example, these may include a CPU, a DSP, an ASIC, a controller, a FPGA device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein.
  • the processor 1102 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.
  • the memory 1104 may include a cache memory (e.g., a cache memory of the processor 1102) , RAM, MRAM, ROM, PROM, EPROM, EEPROM, flash memory, a solid state memory device, one or more hard disk drives, memristor-based arrays, other forms of volatile and non-volatile memory, or a combination of different types of memory.
  • the memory 1104 may include a non-transitory computer-readable medium.
  • the memory 1104 may store instructions 1106.
  • the instructions 1106 may include instructions that, when executed by the processor 1102, cause the processor 1102 to perform operations described herein, for example, aspects of FIGS. 2-9 and 13. Instructions 1106 may also be referred to as code, which may be interpreted broadly to include any type of computer-readable statement (s) as discussed above with respect to FIG. 10.
  • the HARQ module 1108 may be implemented via hardware, software, or combinations thereof.
  • the HARQ module 1108 may be implemented as a processor, circuit, and/or instructions 1106 stored in the memory 1104 and executed by the processor 1102.
  • the HARQ module 1108 can be integrated within the modem subsystem 1112.
  • the HARQ module 1108 can be implemented by a combination of software components (e.g., executed by a DSP or a general processor) and hardware components (e.g., logic gates and circuitry) within the modem subsystem 1112.
  • the HARQ module 1108 may communicate with one or more components of BS 1100 to implement various aspects of the present disclosure, for example, aspects of FIGS. 2-9 and 13.
  • the HARQ module 1108 is configured to receive, from a UE (e.g., the UEs 115 and 1000) in a first configured grant resource within a licensed radio frequency band, uplink data in a first configured grant transmission.
  • the HARQ module 1108 is further configured to decode the first configured grant transmission and transmit, to the UE in the licensed radio frequency band, a DCI message including an ACK/NACK feedback for the uplink data based on the decoding result.
  • the DCI message may have a message structure as discussed above in relation to FIG. 7.
  • the DCI message may include a ACK/NACK bitmap, where each bit is associated with a HARQ process (identified by a HARQ ID) at the UE 1000, and the DCI message may indicate the ACK/NACK feedback in a first bit of the ACK/NACK bitmap based on the first bit being corresponding to a HARQ ID associated with the uplink data.
  • the DCI message may have a message structure as discussed above in relation to FIG. 8 or 9.
  • the DCI message may include a ACK/NACK bitmap, where each bit is associated with a configured grant configuration or CG-UL configuration at the UE 1000, and the DCI message may indicate the ACK/NACK feedback in a first bit of the ACK/NACK bitmap based on the first bit being corresponding to a configured grant configuration that configured the first configured grant resource.
  • the transceiver 1110 may include the modem subsystem 1112 and the RF unit 1114.
  • the transceiver 1110 can be configured to communicate bi-directionally with other devices, such as the UEs 115, 115 and/or 1000 and/or another core network element.
  • the modem subsystem 1112 may be configured to modulate and/or encode data according to a MCS, e.g., a LDPC coding scheme, a turbo coding scheme, a convolutional coding scheme, a digital beamforming scheme, etc.
  • the RF unit 1114 may be configured to process (e.g., perform analog to digital conversion or digital to analog conversion, etc.
  • modulated/encoded data e.g., configured grants, RRC configurations, DCI messages, DCI format 0_1, DCI format 2_2, DL feedback specific DCI format such as DCI format 2_7 or DCI format 2_X, HARQ ACK/ACK
  • the RF unit 1114 may be further configured to perform analog beamforming in conjunction with the digital beamforming.
  • the modem subsystem 1112 and/or the RF unit 1114 may be separate devices that are coupled together at the BS 105, 105 to enable the BS 105 to communicate with other devices.
  • the RF unit 1114 may provide the modulated and/or processed data, e.g. data packets (or, more generally, data messages that may contain one or more data packets and other information) , to the antennas 1116 for transmission to one or more other devices. This may include, for example, transmission of information to complete attachment to a network and communication with a UE 115, 115 or 1100 according to some aspects of the present disclosure.
  • the antennas 1116 may further receive data messages transmitted from other devices and provide the received data messages for processing and/or demodulation at the transceiver 1110.
  • the transceiver 1110 may provide the demodulated and decoded data (e.g., PUSCH data, UCI, UL HARQ data block) to the HARQ module 1108 for processing.
  • the antennas 1116 may include multiple antennas of similar or different designs in order to sustain multiple transmission links.
  • the transceiver 1110 is configured to communicate with one or more components of the BS 1100 to receive, from a UE (e.g., the UE 115, 1000) , in a first configured grant resource within a licensed radio frequency band, uplink data in a first configured grant transmission, and transmit, to the UE in the licensed radio frequency band, a DCI message including an ACK/NACK feedback for the uplink data.
  • a UE e.g., the UE 115, 1000
  • a DCI message including an ACK/NACK feedback for the uplink data.
  • the BS 1100 can include multiple transceivers 1110 implementing different RATs (e.g., NR and LTE) .
  • the BS 1100 can include a single transceiver 1110 implementing multiple RATs (e.g., NR and LTE) .
  • the transceiver 1110 can be
  • FIG. 12 is a flow diagram illustrating a communication method 1200 according to some aspects of the present disclosure. Aspects of the method 1200 can be executed by a computing device (e.g., a processor, processing circuit, and/or other suitable component) of a wireless communication device or other suitable means for performing the steps.
  • a wireless communication device such as a UE 115 or the UE 1000, may utilize one or more components, such as the processor 1002, the memory 1004, the HARQ module 1008, the transceiver 1010, the modem 1012, and the one or more antennas 1016, to execute the steps of method 1200.
  • the method 1200 may employ similar mechanisms as described above in FIGS. 2-9.
  • the method 1200 may be implemented between the UE 115 and the BS 105 of FIG. 3. As illustrated, the method 1200 includes a number of enumerated steps, but embodiments of the method 1200 may include additional steps before, after, and in between the enumerated steps. In some aspects, one or more of the enumerated steps may be omitted or performed in a different order.
  • the UE transmits to a BS uplink data in a first configured grant transmission.
  • the uplink data can be transmitted by the UE in a first configured grant resource within a licensed radio frequency band.
  • the first configured grant resource may be similar to the time and frequency resources described in FIG. 2.
  • the first configured grant resource may be similar to the configured grant resources used for the CG-UL transmissions 430, 530 as described in the context of FIGS. 4, 5 respectively.
  • the UE receives from the BS in the licensed radio frequency band, a downlink control information (DCI) message including an acknowledgement/negative- acknowledgement (ACK/NACK) feedback for the uplink data.
  • DCI downlink control information
  • the DCI message includes a bitmap, wherein the bitmap indicates ACK/NACK feedback for the UL data.
  • the UE receives, from the BS, the DCI message including a bitmap.
  • One or more bits in the bitmap can indicate the ACK/NACK feedback for the uplink data.
  • the one or more bits may be based on or associated with a hybrid automatic repeat request (HARQ) identifier (ID) corresponding to the uplink data.
  • the one or more bits may be based on a first configured grant configuration associated with the first configured grant resource.
  • the bit (s) indicating the ACK/NACK feedback is in a first portion of the bitmap. The first portion of the bitmap may be based on a configuration specific to the UE.
  • the DCI message indicates a value of 1 for an ACK feedback and a value of 0 for a NACK feedback.
  • the UE receives, from the BS in the licensed radio frequency band, a DCI format 0_1 message based on a configured scheduling-radio network temporary identifier (CS-RNTI) .
  • the DCI format 0_1 message can include the bitmap and an indicator indicating the DCI format 0_1 message is a configured grant-downlink feedback information (CG-DFI) message.
  • CG-DFI grant-downlink feedback information
  • the UE receives, from the BS in the licensed radio frequency band, a DCI format 2_2 message based on at least one of a transmission power control-physical uplink control channel-radio network temporary identifier (TPC-PUCCH-RNTI) or a transmission power control-physical uplink shared channel-radio network temporary identifier (TPC-PUSCH-RNTI) .
  • TPC-PUCCH-RNTI transmission power control-physical uplink control channel-radio network temporary identifier
  • TPC-PUSCH-RNTI transmission power control-physical uplink shared channel-radio network temporary identifier
  • the UE receives, from the BS in the licensed radio frequency band, a downlink feedback specific DCI format including the bitmap.
  • the bitmap includes N bits, wherein N is a positive integer.
  • the UE can receive, from the BS, M configured grant configurations including the first configured grant configuration. M can be a positive integer greater than N.
  • the UE selects, based on M being greater than N, N configured grant configurations from the M configured grant configurations based on one or more periodicities associated with the M configured grant configurations and maps each configured grant configuration of the N configured grant configurations to one of the N bits in the bitmap.
  • M is a positive integer less than N and the UE disregards, based on M being less than N, N-M bits from the bitmap.
  • the UE retransmits, to the BS in a second configured grant resource within the licensed radio frequency band based on the ACK/NACK feedback, the uplink data in a second configured grant transmission. For example, if the UE receives a NACK from the BS, then the UE can retransmit the uplink data, from block 1210, to the BS.
  • the first configured grant resource and the second configured grant resource include a common (i.e., the same) frequency resource.
  • the second configured grant resource includes a frequency resource different than the first configured grant resource (e.g., in terms of a frequency location or RB index and/or a number of RBs) .
  • the UE determines to switch to the second frequency resource based on at least one of a retransmission switch period or a number of retransmissions associated with the uplink data. In some instances, the UE receives, from the BS, a configuration for the retransmission switch period. In some instances, the UE can determine to switch to the second frequency resource (e.g., for retransmitting the uplink data) autonomously based on a lack of a retransmission switch period.
  • FIG. 13 is a flow diagram illustrating a communication method 1300 according to some aspects of the present disclosure. Aspects of the method 1300 can be executed by a computing device (e.g., a processor, processing circuit, and/or other suitable component) of a wireless communication device or other suitable means for performing the steps.
  • a wireless communication device such as a BS 105 or the BS 1100, may utilize one or more components, such as the processor 1102, the memory 1104, HARQ module1108, the transceiver 1110, the modem 1112, and the one or more antennas 1116, to execute the steps of method 1300.
  • the method 1300 may employ similar mechanisms as described above in FIGS. 2-9.
  • the method 1300 may be implemented between the BS 105 and the UE 115 of FIG. 3. As illustrated, the method 1200 includes a number of enumerated steps, but embodiments of the method 1200 may include additional steps before, after, and in between the enumerated steps. In some aspects, one or more of the enumerated steps may be omitted or performed in a different order.
  • the BS receives from a UE, in a first configured grant resource within a licensed radio frequency band, uplink data in a first configured grant transmission.
  • the first configured grant resource may be similar to the time and frequency resources described in FIG. 2.
  • the first configured grant resource may be similar to the configured grant resources used for the CG-UL transmissions 430, 530 as described in the context of FIGS. 4, 5 respectively.
  • the BS transmits to the UE in the licensed radio frequency band, a downlink control information (DCI) message including an acknowledgement/negative-acknowledgement (ACK/NACK) feedback for the uplink data.
  • DCI downlink control information
  • the DCI message includes a bitmap, wherein the bitmap indicates ACK/NACK feedback for the UL data.
  • the BS transmits, to the UE, the DCI message including a bitmap.
  • One or more bits in the bitmap can indicate the ACK/NACK feedback for the uplink data.
  • the one or more bits may be based on or associated with a hybrid automatic repeat request (HARQ) identifier (ID) corresponding to the uplink data.
  • the one or more bits may be based on a first configured grant configuration associated with the first configured grant resource.
  • the bit (s) indicating the ACK/NACK feedback is in a first portion of the bitmap. The first portion of the bitmap may be based on a configuration specific to the UE.
  • the DCI message indicates a value of 1 for an ACK feedback and a value of 0 for a NACK feedback.
  • the BS transmits, to the UE in the licensed radio frequency band, a DCI format 0_1 message based on a configured scheduling-radio network temporary identifier (CS-RNTI) .
  • the DCI format 0_1 message can include the bitmap and an indicator indicating the DCI format 0_1 message is a configured grant-downlink feedback information (CG-DFI) message.
  • CG-DFI grant-downlink feedback information
  • the BS transmits, to the UE in the licensed radio frequency band, a DCI format 2_2 message based on at least one of a transmission power control-physical uplink control channel-radio network temporary identifier (TPC-PUCCH-RNTI) or a transmission power control-physical uplink shared channel-radio network temporary identifier (TPC-PUSCH-RNTI) .
  • TPC-PUCCH-RNTI transmission power control-physical uplink control channel-radio network temporary identifier
  • TPC-PUSCH-RNTI transmission power control-physical uplink shared channel-radio network temporary identifier
  • the BS transmits, to the UE in the licensed radio frequency band, a downlink feedback specific DCI format including the bitmap.
  • the bitmap includes N bits, wherein N is a positive integer.
  • the BS can grant, to the UE, M configured grant configurations including the first configured grant configuration.
  • M can be a positive integer greater than N.
  • M is a positive integer less than N.
  • the BS sets, based on M being less than N, N-M bits of the bitmap to a value to indicate to the UE to disregard the N-M bits.
  • the BS receives, from the UE in a second configured grant resource within the licensed radio frequency band based on the ACK/NACK feedback, the uplink data in a second configured grant transmission. For example, if the BS transmits a NACK to the UE, then the BS can monitor for the retransmission of the uplink data to the BS. Accordingly, in some instances the BS monitors the second configured grant resource within the licensed radio frequency band based on an error in the first configured grant transmission and receives the second configured grant transmission based on the monitoring.
  • the first configured grant resource and the second configured grant resource include a common (i.e., the same) frequency resource.
  • the second configured grant resource includes a frequency resource different than the first configured grant resource.
  • the UE determines to switch to the second frequency resource based on at least one of a retransmission switch period or a number of retransmissions associated with the uplink data.
  • the BS transmits, to the UE, a configuration for the retransmission switch period.
  • Information and signals 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.
  • 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) .
  • the functions described herein 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 may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described above can be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.
  • “or” as used in a list of items indicates an inclusive list such that, for example, a list of [at least one of A, B, or C] means A or B or C or AB or AC or BC or ABC (i.e., A and B and C) .

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

Abstract

L'invention concerne des systèmes et des procédés de communication sans fil se rapportant à l'accusé de réception (ACK) ou à l'accusé de réception négatif (NACK) de communications de données de liaison montante, y compris les communications de données de requête automatique de répétition hybride (HARQ) de liaison montante dans une bande de fréquences radio autorisée. Dans certains cas, un équipement utilisateur (UE) transmet, à une station de base (BS) dans une première ressource d'autorisation configurée dans une bande de fréquence radio autorisée, des données de liaison montante dans une première transmission d'autorisation configurée, et reçoit, en provenance de la BS dans la bande de radiofréquence autorisée, un message d'informations de commande de liaison descendante (DCI) comprenant une rétroaction d'accusé de réception/accusé de réception négatif (ACK/NACK) pour les données de liaison montante.
PCT/CN2020/107330 2020-08-06 2020-08-06 Accusé de réception ou accusé de réception négatif pour des communications de liaison montante à autorisation configurée WO2022027414A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105406944A (zh) * 2011-02-15 2016-03-16 Lg电子株式会社 在无线接入系统中发送信道质量控制信息的方法和装置
US20180317213A1 (en) * 2017-05-01 2018-11-01 Huawei Technologies Co., Ltd. Systems and methods for downlink control channel signaling for uplink transmission
US20200029318A1 (en) * 2018-07-23 2020-01-23 Samsung Electronics Co., Ltd. Method and apparatus for high reliability transmission in vehicle to everything (v2x) communication
US20200053799A1 (en) * 2018-08-09 2020-02-13 Comcast Cable Communications, Llc Supplementary uplink for random access procedures
US10681648B2 (en) * 2018-01-10 2020-06-09 Comcast Cable Communications, Llc Power control for channel state information

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105406944A (zh) * 2011-02-15 2016-03-16 Lg电子株式会社 在无线接入系统中发送信道质量控制信息的方法和装置
US20180317213A1 (en) * 2017-05-01 2018-11-01 Huawei Technologies Co., Ltd. Systems and methods for downlink control channel signaling for uplink transmission
US10681648B2 (en) * 2018-01-10 2020-06-09 Comcast Cable Communications, Llc Power control for channel state information
US20200029318A1 (en) * 2018-07-23 2020-01-23 Samsung Electronics Co., Ltd. Method and apparatus for high reliability transmission in vehicle to everything (v2x) communication
US20200053799A1 (en) * 2018-08-09 2020-02-13 Comcast Cable Communications, Llc Supplementary uplink for random access procedures

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