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WO2019240937A1 - Demande de répétition automatique hybride à porteuses croisées - Google Patents

Demande de répétition automatique hybride à porteuses croisées Download PDF

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Publication number
WO2019240937A1
WO2019240937A1 PCT/US2019/034166 US2019034166W WO2019240937A1 WO 2019240937 A1 WO2019240937 A1 WO 2019240937A1 US 2019034166 W US2019034166 W US 2019034166W WO 2019240937 A1 WO2019240937 A1 WO 2019240937A1
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WIPO (PCT)
Prior art keywords
carrier
data
control information
downlink control
automatic repeat
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PCT/US2019/034166
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English (en)
Inventor
Ling-San Meng
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Google LLC
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Google LLC
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H04L1/1819—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of additional or different redundancy
    • 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
    • H04L1/1887—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1896—ARQ related signaling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT the frequencies being arranged in component carriers

Definitions

  • a unified air interface which utilizes licensed, unlicensed, and shared license radio spectrum, in multiple frequency bands, is one aspect of enabling the capabilities of fifth generation new radio (5G NR) communication systems.
  • 5G NR fifth generation new radio
  • Some 5GNR systems that operate in unlicensed radio spectrum share the unlicensed radio spectrum with other radio systems and operate under regulations that require access techniques to fairly share the radio spectrum between different users.
  • 4G Long Term Evolution (LTE) systems there is at least one licensed carrier available so that downlink communications requiring low latency can be transmitted on licensed carriers for deterministic operation.
  • Some 5G NR systems are targeted to operate exclusively using unlicensed radio spectrum, generally in a standalone mode that lacks licensed channels. Therefore, these 5G NR systems lack the ability to provide radio resources to support deterministic behavior for communications that require low or guaranteed latency.
  • a base station generates a first downlink control information (DCI) including a first carrier identifier (ID) for a first carrier.
  • DCI downlink control information
  • ID carrier identifier
  • the base station transmits the first DCI in a first search space to the user equipment on the first carrier in a first slot, the first search space being determined by at least the first carrier ID, and transmits a first data associated with the first DCI to the user equipment and on the first carrier.
  • the base station receives a Hybrid Automatic Repeat Request feedback message, (e.g ., a Hybrid Automatic Repeat Request Acknowledgement/Negative Acknowledgement (HARQ- ACK/NACK) feedback message), corresponding to the first data, generates a second DCI including the first carrier ID, transmits the second DCI in a second search space to the user equipment on a second carrier in a second slot, the second search space being determined by at least a second carrier ID for the second carrier, and transmits a second data associated with the second DCI to the user equipment on the second carrier, the second data being a Hybrid Automatic Repeat Request (HARQ) retransmission of the first data.
  • HARQ Hybrid Automatic Repeat Request
  • a user equipment receives a first downlink control information (DCI) in a first search space from the base station on a first carrier in a first slot, the first DCI including a first carrier identifier (ID) for the first carrier and the first search space being determined by at least the first carrier ID.
  • DCI downlink control information
  • ID first carrier identifier
  • the user equipment receives a first data on the first carrier using the first DCI.
  • the user equipment generates a first decoding result by using the first data and, based on the generation of the first decoding result, transmits a Hybrid Automatic Repeat Request feedback message, (e.g ., a Hybrid Automatic Repeat Request Acknowledgement/Negative Acknowledgement (HARQ-ACK/NACK) feedback message) to the base station.
  • a Hybrid Automatic Repeat Request feedback message e.g ., a Hybrid Automatic Repeat Request Acknowledgement/Negative Acknowledgement (HARQ-ACK/NACK) feedback message
  • HARQ-ACK/NACK Hybrid Automatic Repeat Request Acknowledgement/Negative Acknowledgement
  • the user equipment receives a second DCI in a second search space on a second carrier in a second slot, the second DCI including the first carrier ID, the second search space being determined by at least a second carrier ID for the second carrier.
  • the user equipment receives a second data on the second carrier using the second DCI, the second data being a
  • FIG. 1 illustrates an example wireless network system in which various aspects of cross-carrier hybrid automatic repeat request can be implemented.
  • FIG. 2 illustrates an example device diagram of devices that can implement various aspects of cross-carrier hybrid automatic repeat request.
  • FIG. 3 illustrates an example method of cross-carrier hybrid automatic repeat request as generally related to a base station in accordance with aspects of the techniques described herein.
  • FIG. 4 illustrates an example method of cross-carrier hybrid automatic repeat request as generally related to a user equipment in accordance with aspects of the techniques described herein.
  • This document describes using cross-carrier Hybrid Automatic Repeat Request (HARQ) transmission in a Fifth Generation New Radio (5G R) radio system that can perform retransmissions of data from a base station to a user equipment on a second carrier different from a first carrier used for a previous transmission for a same HARQ process.
  • the techniques described are useful in providing deterministic operation and low-latency operation using unlicensed radio spectrum where regulations require Clear Channel (CCA), also known as listen-before-talk (LBT), operations to promote coexistence between users of the unlicensed spectrum.
  • CCA Clear Channel
  • LBT listen-before-talk
  • retransmissions of downlink data can be switched among different carriers to provide determinism and low-latency.
  • Clear channel assessment is a technique used by wireless devices to assess the channel status using energy detection before attempting to perform a transmission.
  • a wireless device measures the energy in a wireless channel to determine if the detected energy is above a threshold which indicates that another device is transmitting on the channel.
  • the wireless device postpones transmitting on the channel or moves to another channel to transmit.
  • Hybrid Automatic Repeat Request is a physical layer transmission technique in modern communication systems where retransmissions are requested by the receiver in the case of a decoding failure. The retransmissions are combined with failed previous transmissions to enable a user equipment to determine whether there is still useful information embedded in the previous failed transmissions.
  • Error control coding is commonly applied to implement HARQ.
  • LTE systems tail- biting convolutional coding (TBCC) and turbo coding with incremental redundancy (IR) are used.
  • TBCC tail- biting convolutional coding
  • IR incremental redundancy
  • 5G NR systems low density parity checking (LDPC) coding is used.
  • the base station issues explicit downlink control information (DCI) to a user device (e.g., user equipment or UE) along with the associated downlink data.
  • a user device e.g., user equipment or UE
  • the user equipment can then configure itself to receive the downlink data and buffers the downlink data if the decoding fails.
  • the user equipment transmits a HARQ ACK/NACK (Acknowledgement/Negative Acknowledgement) feedback message to the base station based on the decoding result for the downlink data.
  • HARQ ACK/NACK Acknowledgement/Negative Acknowledgement
  • the base station In the case of receiving a NACK, the base station retransmits a different redundancy version (RV) of the downlink data to the user equipment.
  • RV redundancy version
  • Multiple stop-and-wait (SW) HARQ processes can occur in a pipeline, so that one HARQ process can begin before obtaining the HARQ ACK/NACK associated with a previous HARQ process.
  • Each HARQ process is given a unique identification number (ID), which is carried in the DCI.
  • ID unique identification number
  • Carrier aggregation was first introduced in LTE- Advanced (3 GPP Release 10) in order to increase bandwidth, thereby increasing the bit rate for data transmission.
  • CC component carrier
  • CC component carrier
  • a maximum of 16 component carriers can be aggregated.
  • Carrier aggregation with at least one secondary cell (SCell) operating in unlicensed spectrum is referred to as Li censed- Assisted Access (LAA) in LTE/LTE-A systems.
  • LAA Li censed- Assisted Access
  • operations in unlicensed spectrum are termed NR-U.
  • NR-U Conventionally, downlink data transmission on a particular carrier can only be scheduled on the same carrier.
  • the base station can only transmit a DCI and associated downlink data on the same carrier.
  • Cross-carrier scheduling removes the limitation of scheduling on a single carrier.
  • each carrier is given a unique ID which is carried in the DCI to indicate which carrier is associated with the downlink DCI.
  • the user equipment receives DCIs using blind decoding.
  • a certain set of time-frequency resources, which the base station can potentially use to transmit a DCI to the user equipment, is known in advance to both the user equipment and the base station.
  • Such a set of time-frequency resources is called a search space.
  • the user equipment blindly performs detection of a DCI over all valid positions in the search space to receive DCIs sent from the base station.
  • a carrier can have more than one search space, with each search space determined by the ID of the scheduled carrier.
  • a NR-U base station can perform retransmissions on a second carrier different than a first carrier used for a previous transmission of the same HARQ process.
  • a cross-HARQ indicator field is included in the DCI. If the cross-HARQ indicator field is set to OFF, the existing carrier indicator field (CIF) (e.g, carrier identifier) functions as before, i.e., a CIF pointing to another carrier indicates that there is downlink data (e.g, first data) scheduled for the user equipment on that carrier.
  • CIF carrier indicator field
  • the CIF indicates which carrier is targeted for the downlink data.
  • a DCI transmitted on a first carrier including a CIF pointing to a second carrier means the associated downlink data is to be transmitted on the first carrier, but the continuation of the HARQ process for the downlink data occurs on the second carrier.
  • the transmission of the downlink data is conceptually moved from the first carrier to the second carrier. This solves the problem when the first carrier is temporarily unavailable for retransmission due to an LBT failure.
  • the base station can send different redundancy versions of the same downlink data on different carriers in the same slot. This can be accomplished by transmitting multiple DCIs on separate component carriers with the DCIs all having the same CIF and the cross-HARQ indicator being set to ON. The user equipment would then be able to determine that all the DCIs and their associated copies of the downlink data originate from a same data, and the copies of downlink data are simply different redundancy versions. In case there are multiple HARQ processes, a HARQ process ID is also carried in the DCI to further distinguish among different HARQ processes. For example, the base station can configure a third carrier to be cross-scheduled by the first carrier to transmit additional data.
  • the base station transmits a second message configuring the third carrier and generates a third DCI including a third carrier identifier for the third carrier, and a third cross-Hybrid Automatic Repeat Request indicator field indicating a third data (additional data) associated with the third DCI is not a cross-Hybrid Automatic Repeat Request transmission.
  • the base station can configure a fourth carrier to transmit the a second (different) redundancy version of the first data.
  • the base station generates a fourth DCI and a fourth data associated with the fourth DCI, the fourth data being a retransmission of the first data.
  • the base station transmits the fourth downlink control information to the user equipment on a fourth carrier in the second slot.
  • the fourth DCI includes a third HARQ process identifier having same value as the first Hybrid Automatic Repeat Request process identifier.
  • the fourth DCI includes a second counter downlink assignment index having same value as in the first counter downlink assignment index indicating that the fourth data is a second redundancy version of the first data.
  • FIG. 1 illustrates an example environment 100 which includes a user equipment 110 (UE 110) that can communicate with base stations 120 (illustrated as base stations 121 and 122) through wireless communication links 130 (wireless link 130), illustrated as wireless links 131 and 132.
  • UE 110 user equipment 110
  • base stations 120 illustrated as base stations 121 and 122
  • wireless link 130 wireless link 130
  • the UE 110 is implemented as a smartphone but may be implemented as any suitable computing or electronic device, such as a mobile communication device, modem, cellular phone, gaming device, navigation device, media device, laptop computer, desktop computer, tablet computer, smart appliance, vehicle-based communication system, or an Internet- of-Things (IoT) device such as a sensor or an actuator.
  • IoT Internet- of-Things
  • the base stations 120 may be implemented in a macrocell, microcell, small cell, picocell, and the like, or any combination thereof.
  • the base stations 120 communicate with the user equipment 110 using the wireless links 131 and 132, which may be implemented as any suitable type of wireless link.
  • the wireless links 131 and 132 include control and data communication, such as downlink of data and control information communicated from the base stations
  • the wireless links 130 may include one or more wireless links (e.g ., radio links) or bearers implemented using any suitable communication protocol or standard, or combination of communication protocols or standards, such as 3rd Generation Partnership Project Long-Term Evolution (3GPP LTE), Fifth Generation New Radio (5G NR), and so forth.
  • Multiple wireless links 130 may be aggregated in a carrier aggregation to provide a higher data rate for the LIE 110.
  • Multiple wireless links 130 from multiple base stations 120 may be configured for Coordinated Multipoint (CoMP) communication with the UE 110.
  • CoMP Coordinated Multipoint
  • the base stations 120 are collectively a Radio Access Network 140 (e.g., RAN, Evolved Universal Terrestrial Radio Access Network, E-UTRAN, 5G NR RAN or NR RAN).
  • the base stations 121 and 122 in the RAN 140 are connected to a core network 150.
  • the base stations 121 and 122 connect, at 102 and 104 respectively, to the core network 150 through an NG2 interface for control -plane signaling and using an NG3 interface for user-plane data communications when connecting to a 5G core network, or using an Sl interface for control-plane signaling and user-plane data communications when connecting to an Evolved Packet Core (EPC) network.
  • EPC Evolved Packet Core
  • the base stations 121 and 122 can communicate using an Xn Application Protocol (XnAP) through an Xn interface, or using an X2 Application Protocol (X2AP) through an X2 interface, at 106, to exchange user-plane and control -plane data.
  • XnAP Xn Application Protocol
  • X2AP X2 Application Protocol
  • the user equipment 110 may connect, via the core network 150, to public networks, such as the Internet 160 to interact with a remote service 170.
  • FIG. 2 illustrates an example device diagram 200 of the user equipment 110 and the base stations 120.
  • the user equipment 110 and the base stations 120 may include additional functions and interfaces that are omitted from FIG. 2 for the sake of clarity.
  • the user equipment 110 includes antennas 202, a radio frequency front end 204 (RF front end 204), an LTE transceiver 206, and a 5GNR transceiver 208 for communicating with base stations 120 in the RAN 140.
  • the RF front end 204 of the user equipment 110 can couple or connect the LTE transceiver 206, and the 5G R transceiver 208 to the antennas 202 to facilitate various types of wireless communication.
  • the antennas 202 of the user equipment 110 may include an array of multiple antennas that are configured similar to or differently from each other.
  • the antennas 202 and the RF front end 204 can be tuned to, and/or be tunable to, one or more frequency bands defined by the 3GPP LTE and 5G NR communication standards and implemented by the LTE transceiver 206, and/or the 5GNR transceiver 208.
  • the antennas 202, the RF front end 204, the LTE transceiver 206, and/or the 5GNR transceiver 208 may be configured to support beamforming for the transmission and reception of communications with the base stations 120.
  • the antennas 202 and the RF front end 204 can be implemented for operation in sub-gigahertz bands, sub-6 GHZ bands, and/or above 6 GHz bands that are defined by the 3GPP LTE and 5G NR communication standards.
  • the user equipment 110 also includes processor(s) 210 and computer- readable storage media 212 (CRM 212).
  • the processor 210 may be a single core processor or a multiple core processor composed of a variety of materials, such as silicon, polysilicon, high-K dielectric, copper, and so on.
  • CRM 212 may include any suitable memory or storage device such as random-access memory (RAM), static RAM (SRAM), dynamic RAM (DRAM), non-volatile RAM (NVRAM), read-only memory (ROM), or Flash memory useable to store device data 214 of the user equipment 110.
  • the device data 214 includes user data, multimedia data, beamforming codebooks, applications, and/or an operating system of the user equipment 110, which are executable by processor(s) 210 to enable user-plane communication, control-plane signaling, and user interaction with the user equipment 110.
  • the CRM 212 may also include a data decoder 216.
  • the data decoder 216 may be implemented in whole or part as hardware logic or circuitry integrated with or separate from other components of the user equipment 110.
  • the data decoder 216 can communicate with the antennas 202, the RF front end 204, the LTE transceiver 206, and/or the 5G NR. transceiver 208 to implement techniques for cross-carrier hybrid automatic repeat request described herein.
  • the device diagram for the base stations 120 includes a single network node (e.g . , a gNode B).
  • the functionality of the base stations 120 may be distributed across multiple network nodes or devices and may be distributed in any fashion suitable to perform the functions described herein.
  • the base stations 120 include antennas 252, a radio frequency front end 254 (RF front end 254), one or more LTE transceivers 256, and/or one or more 5G NR. transceivers 258 for communicating with the TIE 110.
  • the RF front end 254 of the base stations 120 can couple or connect the LTE transceivers 256 and the 5G NR. transceivers 258 to the antennas 252 to facilitate various types of wireless communication.
  • the antennas 252 of the base stations 120 may include an array of multiple antennas that are configured similar to or differently from each other.
  • the antennas 252 and the RF front end 254 can be tuned to, and/or be tunable to, one or more frequency band defined by the 3GPP LTE and 5G NR. communication standards, and implemented by the LTE transceivers 256, and/or the 5G NR. transceivers 258.
  • the antennas 252, the RF front end 254, the LTE transceivers 256, and/or the 5G NR. transceivers 258 may be configured to support beamforming, such as Massive-MIMO, for the transmission and reception of communications with the UE 110.
  • the base stations 120 also include processor(s) 260 and computer- readable storage media 262 (CRM 262).
  • the processor 260 may be a single core processor or a multiple core processor composed of a variety of materials, such as silicon, polysilicon, high-K dielectric, copper, and so on.
  • CRM 262 may include any suitable memory or storage device such as random-access memory (RAM), static RAM (SRAM), dynamic RAM (DRAM), non-volatile RAM (NVRAM), read-only memory (ROM), or Flash memory useable to store device data 264 of the base stations 120.
  • the device data 264 includes network scheduling data, radio resource management data, beamforming codebooks, applications, and/or an operating system of the base stations 120, which are executable by processor(s) 260 to enable communication with the user equipment 110.
  • CRM 262 also includes a data encoder 266.
  • the data encoder 266 may be implemented in whole or part as hardware logic or circuitry integrated with or separate from other components of the base stations 120.
  • the data encoder 266 configures the LTE transceivers 256 and the 5G R transceivers 258 for communication with the user equipment 110, as well as communication with a core network, such as the core network 150.
  • the base stations 120 include an inter-base station interface 268, such as an Xn and/or X2 interface, which the data encoder 266 configures to exchange user- plane and control -plane data between other base stations 120, to manage the communication of the base stations 120 with the user equipment 110.
  • the base stations 120 include a core network interface 270 that the data encoder 266 configures to exchange user-plane and control-plane data with core network functions and/or entities.
  • Example methods 300 and 400 are described with reference to FIGs. 3 and 4 in accordance with one or more aspects of cross-carrier hybrid automatic repeat request.
  • the order in which the method blocks are described are not intended to be construed as a limitation, and any number of the described method blocks can be skipped or combined in any order to implement a method or an alternate method.
  • any of the components, modules, methods, and operations described herein can be implemented using software, firmware, hardware ( e.g ., fixed logic circuitry), manual processing, or any combination thereof.
  • Some operations of the example methods may be described in the general context of executable instructions stored on computer-readable storage memory that is local and/or remote to a computer processing system, and implementations can include software applications, programs, functions, and the like.
  • any of the functionality described herein can be performed, at least in part, by one or more hardware logic components, such as, and without limitation, Field-programmable Gate Arrays (FPGAs), Application-specific Integrated Circuits (ASICs), Application-specific Standard Products (ASSPs), System- on-a-chip systems (SoCs), Complex Programmable Logic Devices (CPLDs), and the like.
  • FPGAs Field-programmable Gate Arrays
  • ASICs Application-specific Integrated Circuits
  • ASSPs Application-specific Standard Products
  • SoCs System- on-a-chip systems
  • CPLDs Complex Programmable Logic Devices
  • FIG. 3 illustrates example method(s) 300 of cross-carrier hybrid automatic repeat request as generally related to communications by the base station 121.
  • a base station performs a clear channel assessment procedure.
  • the base station 121 performs a clear channel assessment by detecting an amount of energy on a radio channel to determine if the detected energy is above a threshold which indicates that another device is transmitting on the channel.
  • the base station generates a first downlink control information (DCI) including a first carrier identifier (ID) for a first carrier.
  • DCI downlink control information
  • the base station 121 generates a first downlink control information (DCI) including a first carrier identifier (ID) for a first carrier.
  • the DCI includes a cross- HARQ indicator field to enable the HARQ transmission and/or retransmission to move to another carrier on another channel if the channel of the first carrier becomes unavailable to the base station.
  • the base station transmits the first DCI in a first search space to the user equipment on the first carrier in a first slot, the first search space being determined by at least the first carrier ID.
  • the base station 121 transmits the first DCI in a first search space to the user equipment 110 on the first carrier in a first slot, the first search space being determined by at least the first carrier ID.
  • the base station transmits a first data associated with the first DCI to the user equipment and on the first carrier.
  • the base station 121 transmits a first data associated with the first DCI to the user equipment 110 and on the first carrier.
  • the base station receives a Hybrid Automatic Repeat Request Acknowledgement/Negative Acknowledgement (HARQ-ACK/NACK) feedback message corresponding to the first data.
  • HARQ-ACK/NACK Hybrid Automatic Repeat Request Acknowledgement/Negative Acknowledgement
  • the base station 121 receives a Hybrid Automatic Repeat Request Acknowledgement/Negative Acknowledgement (HARQ-ACK/NACK) feedback message corresponding to the first data from the user equipment 110.
  • HARQ-ACK/NACK Hybrid Automatic Repeat Request Acknowledgement/Negative Acknowledgement
  • the base station generates a second DCI including the first carrier ID.
  • the base station 121 generates a second DCI including the first carrier ID that indicates that a continuation of the HARQ process for the first data occurs on the second carrier.
  • the base station transmits the second DCI in a second search space to the user equipment on a second carrier in a second slot, the second search space being determined by at least a second carrier ID for the second carrier.
  • the base station 121 transmits the second DCI in a second search space to the user equipment 110 on a second carrier in a second slot, the second search space being determined by at least a second carrier ID for the second carrier.
  • the base station transmits a second data associated with the second DCI to the user equipment on the second carrier, the second data being a Hybrid Automatic Repeat Request (HARQ) retransmission of the first data.
  • the base station 121 transmits a second data associated with the second DCI to the user equipment 110 on the second carrier, the second data being a Hybrid Automatic Repeat Request (HARQ) retransmission of the first data.
  • HARQ Hybrid Automatic Repeat Request
  • FIG. 4 illustrates example method(s) 400 of cross-carrier hybrid automatic repeat request as generally related to the user equipment 110.
  • a user equipment performs a clear channel assessment procedure.
  • the user equipment 110 performs a clear channel assessment by detecting an amount of energy on a radio channel.
  • the user equipment receives a first downlink control information (DCI) in a first search space from the base station on a first carrier in a first slot, the first DCI including a first carrier identifier (ID) for the first carrier, the first search space being determined by at least the first carrier ID.
  • DCI downlink control information
  • the user equipment 110 receives a first downlink control information (DCI) in a first search space from the base station 121 on a first carrier in a first slot, the first DCI including a first carrier identifier (ID) for the first carrier, the first search space being determined by at least the first carrier ID.
  • the user equipment After receiving the first DCI, the user equipment then configures itself to receive the first data and buffers the first data if the decoding of the first data fails. [0040] At block 406, the user equipment receives a first data on the first carrier using the first DCI. For example, the user equipment 110 receives a first data on the first carrier using the first DCI from the base station 121.
  • the user equipment generates a first decoding result by using the first data.
  • the data decoder 216 of the user equipment 110 generates a first decoding result by using the first data.
  • the user equipment transmits a Hybrid Automatic Repeat Request Acknowledgement/Negative Acknowledgement (HARQ-ACK/NACK) feedback message to the base station.
  • HARQ-ACK/NACK Hybrid Automatic Repeat Request Acknowledgement/Negative Acknowledgement
  • the user equipment 110 transmits a Hybrid Automatic Repeat Request Acknowledgement/Negative Acknowledgement (HARQ- ACK/NACK) feedback message to the base station 121 indicating that the first data was successfully decoded or that the decoding failed.
  • HARQ-ACK/NACK Hybrid Automatic Repeat Request Acknowledgement/Negative Acknowledgement
  • the user equipment receives a second DCI in a second search space on a second carrier in a second slot, the second DCI including the first carrier ID, the second search space being determined by at least a second carrier ID for the second carrier.
  • the user equipment 110 receives, from the base station 121, a second DCI in a second search space on a second carrier in a second slot, the second DCI including the first carrier ID, the second search space being determined by at least a second carrier ID for the second carrier.
  • the user equipment receives a second data on the second carrier using the second DCI, the second data being a retransmission of the first data.
  • the user equipment 110 receives, from the base station 121, a second data on the second carrier using the second DCI, the second data being a retransmission of the first data.
  • the user equipment generates a second decoding result by using at least the first data and the second data.
  • the data decoder 216 of the user equipment 110 generates a second decoding result by using at least the first data, buffered by the user equipment, and the second data.
  • the user equipment transmits a second HARQ-ACK/NACK feedback message to the base station.
  • the user equipment 110 transmits a second HARQ-ACK/NACK feedback message to the base station 121 indicating that the first data and second data was successfully decoded or that the decoding failed.
  • Example 1 A method for communicating downlink data by a base station to a user equipment, the method comprising:
  • the first downlink control information in a first search space to the user equipment on the first carrier in a first slot, the first search space being determined by at least the first carrier identifier;
  • the second downlink control information in a second search space to the user equipment on a second carrier in a second slot, the second search space being determined by at least a second carrier identifier for the second carrier;
  • Example 2 The method of example 1, wherein the first downlink control information includes a first cross-Hybrid Automatic Repeat Request indicator field indicating that the first data is not a cross-Hybrid Automatic Repeat Request transmission, and wherein the second downlink control information includes a second cross-Hybrid Automatic Repeat Request indicator field indicating that the second data is a cross-Hybrid Automatic Repeat Request transmission that is continued on the second carrier.
  • Example 3 The method of example 1 or example 2, wherein the second downlink control information including the first carrier identifier is generated in response to a Hybrid Automatic Repeat Request Acknowledgement/Negative Acknowledgement feedback message indicating that the transmittal of the first data on the first carrier has failed.
  • Example 4 The method of example 3, wherein the second data is a different redundancy version of the first data.
  • Example 5 The method of any one of the preceding examples, further comprising: transmitting a message configuring cross-carrier scheduling to the user equipment.
  • Example 6 The method of any of the preceding examples, further comprising: transmitting a second message configuring a third carrier to be cross-scheduled by the first carrier;
  • Example 7 The method of any of the preceding examples, further comprising: generating a fourth downlink control information and a fourth data associated with the fourth downlink control information, the fourth data being a retransmission of the first data;
  • Example 8 The method of example 7, wherein the fourth downlink control information includes a third Hybrid Automatic Repeat Request process identifier having same value as a first Hybrid Automatic Repeat Request process identifier.
  • Example 9 The method of example 7 or 8, wherein the second downlink control information includes a first counter downlink assignment index, and wherein the fourth downlink control information includes a second counter downlink assignment index having same value as in the first counter downlink assignment index.
  • Example 10 The method of any one of examples 7 to 9, wherein the fourth data is a different redundancy version of the first data.
  • Example 11 The method of any of the preceding examples, wherein the first downlink control information includes a first Hybrid Automatic Repeat Request process identifier, and wherein the second downlink control information includes a second Hybrid Automatic Repeat Request process identifier having the same value as the first Hybrid Automatic Repeat Request process identifier.
  • Example 12 The method of any of the preceding examples, further comprising: transmitting, to the user equipment, a third message configuring cross-Hybrid Automatic Repeat Request transmission.
  • Example 13 The method of any of the preceding examples, wherein the second data is a different redundancy version of the first data.
  • Example 14 The method of any of the preceding examples, wherein the base station and the user equipment communicate in an unlicensed frequency band.
  • Example 15 The method of any of the preceding examples, wherein the base station and the user equipment communicate using a carrier aggregation.
  • Example 16 The method of any of the preceding examples, further comprising: performing, by the base station, a clear channel assessment procedure.
  • Example 17 A base station comprising:
  • Example 18 A method for a user equipment to communicate with a base station, the method comprising:
  • the first downlink control information including a first carrier identifier for the first carrier, the first search space being determined by at least the first carrier identifier;
  • the second downlink control information including the first carrier identifier, the second search space being determined by at least a second carrier identifier for the second carrier;
  • Example 19 The method of example 16, wherein the first downlink control information includes a first cross-Hybrid Automatic Repeat Request indicator field indicating that the first data is not a cross-Hybrid Automatic Repeat Request transmission, and wherein the second downlink control information includes a second cross-Hybrid Automatic Repeat Request indicator field indicating that the second data is a cross-Hybrid Automatic Repeat Request transmission that is continued on the second carrier.
  • Example 20 The method of example 18 or 19, further comprising:
  • Example 21 The method of any one of examples 18 to 20, further comprising: receiving a second message configuring a third carrier to be cross scheduled by the first carrier;
  • the third downlink control information including a third carrier identifier for the third carrier, a third cross-Hybrid Automatic Repeat Request indicator field indicating a third data associated with the third downlink control information is not a cross-Hybrid Automatic Repeat Request transmission, and the third search space being determined by at least the third carrier identifier;
  • Example 22 The method of any one of examples 18 to 21, further comprising: receiving a fourth downlink control information on a fourth carrier in the second slot;
  • Example 23 The method of example 22, wherein the fourth data is a different redundancy version of the first data.
  • Example 24 The method of example 22 or 23, wherein the second downlink control information includes a first counter downlink assignment index, and wherein the fourth downlink control information includes a second counter downlink assignment index having the same value as the first counter downlink assignment index.
  • Example 25 The method of any one of examples 18 to 24, wherein the first downlink control information includes a first Hybrid Automatic Repeat Request process identifier, and wherein the second downlink control information includes a second Hybrid Automatic Repeat Request process identifier having same value as the first Hybrid Automatic Repeat Request process identifier.
  • Example 26 The method of example 25, wherein the fourth downlink control information includes a third Hybrid Automatic Repeat Request process identifier having same value as the first Hybrid Automatic Repeat Request process identifier.
  • Example 27 The method of any one of examples 18 to 26, further comprising: receiving a third message configuring cross-Hybrid Automatic Repeat Request transmission.
  • Example 28 The method of any one of examples 18 to 27, wherein the second data is a different redundancy version of the first data.
  • Example 29 The method of any one of examples 18 to 28, wherein the base station and the user equipment communicate in an unlicensed frequency band.
  • Example 30 The method of any one of examples 18 to 29, wherein the base station and the user equipment communicate using a carrier aggregation.
  • Example 31 The method of any one of examples 18 to 30, the method further comprising:
  • Example 32 A user equipment comprising:
  • a base station comprising:
  • a memory comprising instructions executable by the processor to configure the base station to:
  • the first downlink control information in a first search space to the user equipment on the first carrier in a first slot, the first search space being determined by at least the first carrier identifier;
  • the second downlink control information in a second search space to the user equipment on a second carrier in a second slot, the second search space being determined by at least a second carrier identifier for the second carrier;
  • a user equipment comprising:
  • a memory comprising instructions executable by the processor to configure the user equipment to:
  • the base station receives a first downlink control information in a first search space from the base station on a first carrier in a first slot, the first downlink control information including a first carrier identifier for the first carrier, the first search space being determined by at least the first carrier identifier;
  • the second downlink control information including the first carrier identifier, the second search space being determined by at least a second carrier identifier for the second carrier;

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

Abstract

La présente invention concerne l'utilisation d'une transmission d'une demande de répétition automatique hybride (HARQ) à porteuses croisées dans un système radio de cinquième génération New Radio (5G NR) qui peut réaliser des retransmissions de données d'une station de base (121) à un équipement d'utilisateur (110) sur une seconde porteuse différente d'une première porteuse utilisée pour une transmission précédente pour un même processus HARQ. Les techniques décrites sont utiles pour fournir un fonctionnement déterministe et un fonctionnement à faible latence à l'aide d'un spectre radio sans licence dans lequel des réglementations exigent des opérations Canal libre (CCA), également appelées écoute avant de parler (LBT), pour favoriser la coexistence entre des utilisateurs du spectre sans licence. Avec des techniques de transmission HARQ à porteuses croisées, des retransmissions de données de liaison descendante peuvent être commutées entre différentes porteuses pour fournir un déterminisme et une faible latence.
PCT/US2019/034166 2018-06-14 2019-05-28 Demande de répétition automatique hybride à porteuses croisées Ceased WO2019240937A1 (fr)

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EP3086499A1 (fr) * 2013-12-19 2016-10-26 China Academy of Telecommunications Technology Procédé et dispositif de transmission de données

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EP3086499A1 (fr) * 2013-12-19 2016-10-26 China Academy of Telecommunications Technology Procédé et dispositif de transmission de données

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CN112995314A (zh) * 2021-02-23 2021-06-18 北京贝耀信科技有限公司 一种将信息储存到区块链系统的方法

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