WO2021062707A1 - Procédés, dispositifs et supports associés lisible par ordinateur, pour des communications - Google Patents

Procédés, dispositifs et supports associés lisible par ordinateur, pour des communications Download PDF

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Publication number
WO2021062707A1
WO2021062707A1 PCT/CN2019/109606 CN2019109606W WO2021062707A1 WO 2021062707 A1 WO2021062707 A1 WO 2021062707A1 CN 2019109606 W CN2019109606 W CN 2019109606W WO 2021062707 A1 WO2021062707 A1 WO 2021062707A1
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WIPO (PCT)
Prior art keywords
feedback
dai
harq feedback
value
terminal device
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PCT/CN2019/109606
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English (en)
Inventor
Lin Liang
Gang Wang
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Nec Corporation
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Priority to PCT/CN2019/109606 priority Critical patent/WO2021062707A1/fr
Publication of WO2021062707A1 publication Critical patent/WO2021062707A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • 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
    • H04L1/1685—Details of the supervisory signal the supervisory signal being transmitted in response to a specific request, e.g. to a polling signal
    • 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
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1896—ARQ related signaling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals

Definitions

  • the non-limiting and exemplary embodiments of the present disclosure generally relate to the field of wireless communication techniques, and more particularly relate to communication methods, devices and computer readable media in a wireless communication system.
  • New radio access system also called as NR system or NR network
  • NR system is the next generation communication system.
  • 3GPP Third Generation Partnership Project
  • the NR system will consider frequency ranging up to 100Ghz with an object of a single technical framework addressing all usage scenarios, requirements and deployment scenarios, which includes requirements such as enhanced mobile broadband, massive machine-type communications, and ultra-reliable and low latency communications.
  • LTE Long Term Evolution
  • LAA License Assisted Access
  • Hybrid Automatic Repeat reQuest (HARQ) and HARQ-ACK feedback is one of key features in the NR system.
  • HARQ-ACK feedback design the robustness issue shall be considered to reduce impacts of missed detection and missed transmission of feedback on the NR system.
  • the probability of missed detection and missed transmission of feedback (containing HARQ-ACK bits) due to an LBT failure would increase accordingly.
  • it requires some enhancements on the NR system, especially enhancements on HARQ codebook in the NR-U system such as the way of using the Counter Downlink Assignment Index (C-DAI) , one-shot HARQ-ACK feedback, etc., are needed to redesigned.
  • C-DAI Counter Downlink Assignment Index
  • example embodiments of the present disclosure provide a new solution for simultaneous connection based handover in a wireless communication system.
  • the communication method may be implemented at a terminal device, and one of its objects is to provide an improved Hybrid Automatic Repeat reQuest (HARQ) feedback.
  • the communication method may include receiving, from a network device, a feedback indication for a last transmitted HARQ feedback of the terminal device, the feedback indication indicating whether the last transmitted HARQ feedback was received; determining, based on the received feedback indication, a downlink assignment index (DAI) value starting from which another HARQ feedback is to be generated, wherein the DAI value is a next DAI value of a DAI corresponding to a last received HARQ feedback of the network device; and generating the other HARQ feedback starting from the determined DAI.
  • DAI downlink assignment index
  • the communication method may be implemented at a terminal device, and one of its objects is to provide an improved Hybrid Automatic Repeat reQuest (HARQ) feedback.
  • the communication method may include receiving a one-shot HARQ feedback trigger information from the network device and generating a one-shot HARQ feedback with a feedback value for a HARQ identity indicating an expected new data indication (NDI) value of the terminal device in accordance with determination that a one-short feedback transmission is trigged by the network device.
  • NDI expected new data indication
  • the communication method may be implemented at a network device, and one of its objects is to provide an improved Hybrid Automatic Repeat reQuest (HARQ) feedback.
  • the communication method may include transmitting a feedback indication for a last transmitted HARQ feedback of a terminal device to the terminal device, the feedback indication indicating whether the last transmitted HARQ feedback was received; receiving another HARQ feedback from the terminal device; and determining a DAI value starting from which the other HARQ feedback was generated based on whether the last transmitted HARQ feedback was received, wherein the DAI value is a next DAI value of a DAI corresponding to a last received HARQ feedback of the network device.
  • HARQ Hybrid Automatic Repeat reQuest
  • the communication method may be implemented at a network device, and one of its objects is to provide an improved Hybrid Automatic Repeat reQuest (HARQ) feedback.
  • the communication method may include transmitting a downlink control indication to the terminal device, to trigger a one-short feedback transmission; receiving a one-shot HARQ feedback from the terminal device, wherein the one-shot HARQ feedback has a feedback value for a HARQ identity indicating an expected NDI value of the terminal device; and performing the following data retransmission based on the expected NDI value and a current NDI value.
  • HARQ Hybrid Automatic Repeat reQuest
  • the terminal device may include at least one processor and at least one memory coupled with the at least one processor.
  • the terminal device has computer program codes stored therein which are configured to, when executed on the at least one processor, cause the terminal device to perform operations of any of the first aspect.
  • a terminal device may include at least one processor and at least one memory coupled with the at least one processor.
  • the terminal device has computer program codes stored therein which are configured to, when executed on the at least one processor, cause the terminal device to perform operations of any of the second aspect.
  • the network device may include at least one processor and at least one memory coupled with the at least one processor.
  • the network device has computer program codes stored therein which are configured to, when executed on the at least one processor, cause the network device to perform operations of any of the third aspect.
  • the network device may include at least one processor and at least one memory coupled with the at least one processor.
  • the network device has computer program codes stored therein which are configured to, when executed on the at least one processor, cause the network device to perform operations of any of the fourth aspect.
  • a computer-readable storage medium having a computer program stored thereon which, when executed by at least one processor of a device, causes the device to perform actions in the method according to any embodiment in any of the first aspect.
  • a computer-readable storage medium having a computer program stored thereon which, when executed by at least one processor of a device, causes the device to perform actions in the method according to any embodiment in any of the second aspect.
  • a computer-readable storage medium having a computer program stored thereon which, when executed by at least one processor of a device, causes the device to perform actions in the method according to any embodiment in any of the third aspect.
  • a computer-readable storage medium having a computer program stored thereon which, when executed by at least one processor of a device, causes the device to perform actions in the method according to any embodiment in any of the fourth aspect.
  • a computer program product comprising a computer-readable storage medium according to the ninth aspect.
  • a fourteenth aspect of the present disclosure there is provided a computer program product comprising a computer-readable storage medium according to the tenth aspect.
  • a computer program product comprising a computer-readable storage medium according to the eleventh aspect.
  • a computer program product comprising a computer-readable storage medium according to the twelfth aspect.
  • Fig. 1 schematically illustrates an existing HARQ feedback solution
  • Fig. 2 schematically illustrates a communication method at a terminal device according to embodiments of the present disclosure
  • Fig. 3 illustrates an example solution of determining a DAI value from which another HARQ feedback is to be generated according to embodiments of the present disclosure
  • Figs. 4A to 4C illustrate an example HARQ feedback solution according to embodiments of the present disclosure
  • Figs. 5A to 5C illustrate alternative HARQ feedback solutions according to embodiments of the present disclosure
  • Fig. 6 schematically illustrates a communication method at a network device according to embodiments of the present disclosure
  • Fig. 7 illustrates an existing one-shot HARQ feedback according to embodiments of the present disclosure
  • Fig. 8 illustrates a communication method at a terminal device according to embodiments of the present disclosure
  • Figs. 9A to 9D illustrate example HARQ feedback solutions according to embodiments of the present disclosure
  • Fig. 10 schematically illustrates a communication method at a network device according to embodiments of the present disclosure.
  • FIG. 11 schematically illustrates a simplified block diagram of a communication system 1100 that can implement the communication solution according to embodiments of the present disclosure.
  • each block in the flowcharts or blocks may represent a module, a program, or a part of code, which contains one or more executable instructions for performing specified logic functions, and in the present disclosure, a dispensable block is illustrated in a dotted line.
  • these blocks are illustrated in particular sequences for performing the steps of the methods, as a matter of fact, they may not necessarily be performed strictly according to the illustrated sequence. For example, they might be performed in reverse sequence or simultaneously, which is dependent on natures of respective operations.
  • block diagrams and/or each block in the flowcharts and a combination of thereof may be implemented by a dedicated hardware-based system for performing specified functions/operations or by a combination of dedicated hardware and computer instructions.
  • references in the specification to “one embodiment, ” “an embodiment, ” “an example embodiment, ” and the like indicate that the embodiment described may include a particular feature, structure, or characteristic, but it is not necessary that every embodiment includes the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
  • first and second etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and similarly, a second element could be termed a first element, without departing from the scope of example embodiments.
  • the term “and/or” includes any and all combinations of one or more of the listed terms.
  • wireless communication network refers to a network following any suitable wireless communication standards, such as New Radio (NR) , Long Term Evolution (LTE) , LTE-Advanced (LTE-A) , Wideband Code Division Multiple Access (WCDMA) , High-Speed Packet Access (HSPA) , and so on.
  • NR New Radio
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • WCDMA Wideband Code Division Multiple Access
  • HSPA High-Speed Packet Access
  • wireless communication network may also be referred to as a “wireless communication system.
  • communications between network devices, between a network device and a terminal device, or between terminal devices in the wireless communication network may be performed according to any suitable communication protocol, including, but not limited to, Global System for Mobile Communications (GSM) , Universal Mobile Telecommunications System (UMTS) , Long Term Evolution (LTE) , New Radio (NR) , wireless local area network (WLAN) standards, such as the IEEE 802.11 standards, and/or any other appropriate wireless communication standard either currently known or to be developed in the future.
  • GSM Global System for Mobile Communications
  • UMTS Universal Mobile Telecommunications System
  • LTE Long Term Evolution
  • NR New Radio
  • WLAN wireless local area network
  • IEEE 802.11 any other appropriate wireless communication standard either currently known or to be developed in the future.
  • the term “network device” refers to a node in a wireless communication network via which a terminal device accesses the network and receives services therefrom.
  • the network device may refer to a base station (BS) or an access point (AP) , for example, a node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , a NR NB (also referred to as a gNB) , a Remote Radio Unit (RRU) , a radio header (RH) , a remote radio head (RRH) , a relay, a low power node such as a femto, a pico, and so forth, depending on the applied terminology and technology.
  • BS base station
  • AP access point
  • NodeB or NB node B
  • eNodeB or eNB evolved NodeB
  • NR NB also referred to as a gNB
  • RRU Remote Radio Unit
  • RH radio header
  • terminal device refers to any device having wireless or wired communication capabilities.
  • the terminal device include, but not limited to, user equipment (UE) , personal computers, desktops, mobile phones, cellular phones, smart phones, personal digital assistants (PDAs) , portable computers, tablets, wearable devices, internet of things (IoT) devices, Internet of Everything (IoE) devices, machine type communication (MTC) devices, device on vehicle for V2X communication where X means pedestrian, vehicle, or infrastructure/network, or image capture devices such as digital cameras, gaming devices, music storage and playback appliances, or Internet appliances enabling wireless or wired Internet access and browsing and the like.
  • UE user equipment
  • PDAs personal digital assistants
  • IoT internet of things
  • IoE Internet of Everything
  • MTC machine type communication
  • X means pedestrian, vehicle, or infrastructure/network
  • image capture devices such as digital cameras, gaming devices, music storage and playback appliances, or Internet appliances enabling wireless or wired Internet access and browsing and the like.
  • the terminal device may be connected with a first network device and a second network device.
  • One of the first network device and the second network device may be a master node and the other one may be a secondary node.
  • the first network device and the second network device may use different radio access technologies (RATs) .
  • the first network device may be a first RAT device and the second network device may be a second RAT device.
  • the first RAT device is eNB and the second RAT device is gNB.
  • Information related with different RATs may be transmitted to the terminal device from at least one of the first network device and the second network device.
  • a first information may be transmitted to the terminal device from the first network device and a second information may be transmitted to the terminal device from the second network device directly or via the first network device.
  • information related with configuration for the terminal device configured by the second network device may be transmitted from the second network device via the first network device.
  • Information related with reconfiguration for the terminal device configured by the second network device may be transmitted to the terminal device from the second network device directly or via the first network device.
  • a terminal device may represent a machine or other device that performs monitoring and/or measurements, and transmits the results of such monitoring and/or measurements to another terminal device and/or network equipment.
  • the terminal device may in this case be a machine-to-machine (M2M) device, which may in a 3GPP context be referred to as a machine-type communication (MTC) device.
  • M2M machine-to-machine
  • MTC machine-type communication
  • the terminal device may be a UE implementing the 3GPP narrow band internet of things (NB-IoT) standard. Examples of such machines or devices are sensors, metering devices such as power meters, industrial machinery, or home or personal appliances, for example refrigerators, televisions, personal wearables such as watches etc.
  • a terminal device may represent a vehicle or other equipment that is capable of monitoring and/or reporting on its operational status or other functions associated with its operation.
  • a downlink (DL) transmission refers to a transmission from a network device to UE, or from a network device as a parent node to another network device as a child node
  • an uplink (UL) transmission refers to a transmission in an opposite direction.
  • Embodiments of the present disclosure provide new communication solutions in a wireless communication system and one of the objects is to provide improved HARQ feedback.
  • the network device transmits a feedback indication for the last transmitted feedback to the terminal device. Based on the feedback indication, the terminal device could determine the last feedback received by the network device and in turn determine the DAI value starting from which another HARQ feedback is to be generated as a next DAI value of a DAI corresponding to the last received feedback. In this way, a dynamic HARQ-ACK accumulated C-DAI could be generated, which could facilitate missed detection of downlink control information (DCI) transmission.
  • DCI downlink control information
  • a one-shot HARQ feedback can be generated with a feedback value for a HARQ identity indicating an expected new data indication (NDI) value of the terminal device, upon a one-short feedback transmission is trigged by the network device.
  • NDI expected new data indication
  • the C-DAI starts from 0 for one HARQ feedback occasion, for example one PUCCH occasion.
  • the terminal device cannot learn such missing but would provide ACKs for DAI 0, 1 and 2 as the HARQ feedback to the network device.
  • it will be desirable to use accumulated C-DAIs for example, within one PDSCH group.
  • the C-DAIs are accumulated. In such a way, the missed detection of DAI 2 can be learned by the terminal device from inconsecutive DAIs.
  • Fig. 2 illustrates a communication method according to embodiments of the present disclosure. The method can be performed at a terminal device like UE or any other terminal.
  • the terminal device may receive, from a network device, a feedback indication for a last transmitted HARQ feedback of the terminal device, the feedback indication indicating whether the last transmitted HARQ feedback was received.
  • the last transmitted HARQ feedback used herein means the HARQ feedback, which should be last transmitted by the terminal device in the last or latest PUCCH occasion.
  • the last transmitted HARQ feedback also means an HARQ feedback that the terminal device should transmit for the last or latest data transmitted by the network device.
  • the network device provides a feedback indication for the last transmitted HARQ feedback to tell the terminal device whether it receives the last transmitted HARQ feedback.
  • the terminal device may determine, based on the received feedback indication, a downlink assignment index (DAI) value starting from which another or new HARQ feedback is to be generated, wherein the DAI value is a next DAI value of a DAI corresponding to a last received HARQ feedback of the network device.
  • DAI downlink assignment index
  • the terminal device can defer whether the last transmitted HARQ feedback is the last received HARQ feedback, and in turn determine the DAI corresponding to the last received HARQ feedback of the network device.
  • the received feedback indication indicates that the last transmitted HARQ feedback is received, it means the last transmitted HARQ feedback is the same as the last received HARQ feedback.
  • the DAI corresponding to the last transmitted HARQ feedback will be the same as the DAI corresponding to a last received HARQ feedback of the network device. For example, if the DAI corresponding to the last transmitted HARQ feedback is 1, then the DAI corresponding to the last received HARQ feedback of the network device is 1 too. Then, the starting DAI value for the new HARQ feedback, i.e., the DAI value starting from which another HARQ feedback is to be generated, will be the next value of the DAI corresponding to the last transmitted HARQ feedback.
  • the DAI corresponding to a last received HARQ feedback of the network device will still be the DAI corresponding to the last transmitted HARQ feedback in the previous PUCCH occasion or still be an initial value 0 (in a case when no previous HARQ feedback is received by the network device) .
  • the starting DAI value for the new HARQ feedback shall still be 0.
  • the other or new HARQ feedback can be generated from the determined DAI.
  • the operation of generating the HARQ feedback could utilize those solutions in the prior art and thus will not be elaborated herein.
  • the terminal device could determine the last HARQ feedback received by the network device and in turn determine the DAI from which a new HARQ feedback shall be generated.
  • the new HARQ feedback starts from the next DAI of the last DAI, which is indicated as ‘received’ by the network device in, for example, DCI for the same PDSCH group.
  • the HARQ starts from DAI 0.
  • Fig. 3 describes an example method of determining a DAI value from which another HARQ feedback is to be generated according to embodiments of the present disclosure.
  • the starting DAI value can be determined by any appropriate method.
  • the terminal device may determine determining a DAI value of the last transmitted HARQ feedback. For example, when the terminal device generates or transmits the HARQ feedback in a PUCCH occasion, it could record the corresponding DAI value of generated or transmitted HARQ feedback.
  • the terminal device may determine a DAI value of the last received HARQ feedback based on the determined DAI value of the last transmitted HARQ feedback and the received feedback indication. Thus, upon the receipt of the feedback indication, the terminal device may determine the DAI value of the last received HARQ feedback. For example, if the feedback indication indicates the last transmitted HRQ feedback is received, it could update the DAI value of the last received HARQ feedback with the determined DAI value of the last transmitted HARQ feedback; if not, it will maintain the DAI value of the last received HARQ feedback.
  • the terminal device determines a next DAI value of the determined DAI value of the last received HARQ feedback as the DAI value starting from which the other HARQ feedback is to be generated.
  • the HARQ feedback in the new PUCCH occasion shall start from the next one and the starting DAI is determined as a next DAI value of the determined DAI value of the last received HARQ feedback.
  • the terminal device may first determine a next DAI value of a DAI corresponding to the last transmitted HARQ feedback. Then based on the determined next DAI value of the DAI corresponding to the last transmitted HARQ feedback and the received feedback indication, the terminal device determines a next DAI value of a DAI corresponding to the last received HARQ feedback. The terminal device will take the next DAI value of a DAI corresponding to the last received HARQ feedback as the DAI value starting from which the other HARQ feedback is to be generated.
  • V_temp when the terminal device generates the dynamic HARQ-ACK codebook, V_temp, should be set based on the C-DAI (i.e., the DAI value of the last transmitted HARQ feedback) and a new feedback indication (NFI) .
  • the parameter V_temp is similar to that in NR-system and indicates the staring DAI value of a PUCCH occasion and the NFI indicates the HARQ feedback in the latest PUCCH occasion was received by providing NFI with a value different from the previous one.
  • a procedure of dynamic HARQ-ACK codebook generation is known and thus will not be detailed herein.
  • V1 and V2 can be used, wherein V1 indicates a next DAI value of a DAI corresponding to the last transmitted HARQ feedback and V2 indicates a next DAI value of a DAI corresponding to the last received HARQ feedback.
  • the terminal device updates V2 as the HARQ feedback is generated or transmitted.
  • the V_temp can be set in accordance with V1.
  • Figs. 4A to 4C illustrate example HARQ feedback solutions according to embodiments of the present disclosure.
  • the NFI received from the network is not changed in the following transmission, and the terminal device can learn that the network device did not receive the HARQ feedback for HARQ DAIs 0 and 1.
  • the terminal device will not update V1 with V2, instead keep the V1 as it is.
  • the HARQ will start from the value of V1, i.e. 0.
  • Fig. 4C illustrates a middle part of PDSCH transmissions.
  • the NFI received from the network is not changed either, and thus the terminal device can learn that the network device did not receive the HARQ feedback for HARQ DAIs 1 and 2.
  • the terminal device will not update V1 with V2, instead it keep the value of V1.
  • the HARQ will start from the value of V1, i.e. 1.
  • the terminal device can always know the missed detection of DAI-2 for each scenario.
  • Figs. 4A to 4C are just given for illustrative purposes and the present disclosure is not limited thereto. Instead, the terminal device may use any other appropriate solutions to determine the DAI value starting from which the other HARQ feedback is to be generated.
  • the terminal device may determine a next DAI value of a DAI corresponding to the last transmitted HARQ feedback. Then, based on the determined next DAI value of the DAI corresponding to the last transmitted HARQ feedback and the received feedback indication, the terminal device determines a next DAI value of a DAI corresponding to the last received HARQ feedback as the DAI value starting from which the other HARQ feedback is to be generated.
  • the staring DAI value V_temp should be set based on the C-DAI (i.e., the DAI value of the last transmitted HARQ feedback) and the NFI.
  • the C-DAI i.e., the DAI value of the last transmitted HARQ feedback
  • the NFI the number of parameters V1 and V2 can be used too but different from the solution described with reference to Fig. 4A to 4C, V1 indicates a DAI value corresponding to the last transmitted HARQ feedback and V2 indicates a DAI value corresponding to the last received HARQ feedback.
  • the V_temp can be set as V1+1 except when no previous HARQ feedback is received within the PDSCH group.
  • Fig. 5A illustrates similar scenario to Fig. 4A but parameters V1 and V2 represent different meanings.
  • Fig. 5B illustrates similar scenario to Fig. 4B but parameters V1 and V2 represent different meanings.
  • Fig. 5C illustrates similar scenario to Fig. 5C but parameters V1 and V2 represent different meanings.
  • the NFI received from the network is not changed either, and thus the terminal device can learn that the network device did not receive the HARQ feedback for HARQ DAIs 1 and 2.
  • the terminal device will not update V1 with V2, but keep the value of V1.
  • the HARQ will start from the value of V1+1, i.e. 1.
  • Fig. 6 further illustrates another communication method according to embodiments of the present disclosure.
  • the communication method can be performed at a network device and one of its objects is to enhance the existing HARQ feedback solution in, for example, the NR-U system.
  • the network device may transmit a feedback indication for a last transmitted HARQ feedback of a terminal device to the terminal device, wherein the feedback indication indicates whether the last transmitted HARQ feedback was received.
  • the network device can tell the terminal device whether it receives the last transmitted HARQ feedback.
  • the terminal device may further utilize the feedback indication to determine the DAI of the last received HARQ feedback and in turn determine the starting DAI of the HARQ feedback to be generated.
  • the network device receives another HARQ feedback from the terminal device.
  • the another HARQ feedback was generated by the terminal device based on the transmitted feedback indication for the last transmitted HARQ feedback.
  • the network device determines, based on whether the last transmitted HARQ feedback was received, a DAI value starting from which the other HARQ feedback was generated wherein the DAI value is a next DAI value of a DAI corresponding to a last received HARQ feedback of the network device. That is to say, the network device will determine the starting DAI accordingly, for example in a similar way to the terminal device. For example, if the last transmitted HARQ feedback was received, the last received HARQ feedback can be determined as the last transmitted HARQ feedback; thus, the starting DAI can be determined as the next DAI value of the DAI corresponding to the last transmitted HARQ feedback.
  • the last received HARQ feedback can be determined as the last transmitted HARQ feedback in previous feedback transmission occasion; and thus the starting DAI can be determined as the next DAI value of the DAI corresponding to the last transmitted HARQ feedback in, for example, previous PUCCH occasion.
  • the network device could update the DAI value of the last received HARQ feedback if the last transmitted HARQ feedback was received and maintain the DAI value of the last received HARQ feedback if it was not received. Then it can just get the newest value of the last received HARQ feedback as the starting DAI.
  • an improved one-short feedback solution Different from legacy HARQ feedback solution in which the HARQ feedback is transmitted per HARQ-ACK feedback occasion, in the one-time HARQ-ACK feedback (for example HARQ-ACK feedback type 3) solution, the ACK/NACK is transmitted per HARQ identity ID. There might be two ways of determining the feedback value for a HARQ identity, which will be described with reference to Fig. 7.
  • one way is to determine the feedback value as an ACK.
  • the other way is set a default feedback value as NACK and reset the feedback value as the default feedback value.
  • the network device can perform data retransmit based on the NACK feedback.
  • simultaneous one-time HARQ-ACK feedback and the dynamic HARQ-ACK feedback based on accumulated C-DAI could become more complex.
  • missed detection of DCI can be inferred from C-DAI but the terminal device does not know the HARQ ID of the DCI and thus it still cannot know the missed detection.
  • Some solutions were proposed to use two bits to indicate ACK/NAVK value of the last received transmission concerning an HARQ identity and a corresponding NDI value respectively, but those solutions would double the number of bits for the one-time HARQ feedback and in turn cause a much higher signaling overhead.
  • an improved communication method and one of its objects is to address the above one-short HARQ feedback issue.
  • Fig. 8 illustrates a communication method for according to embodiments of the present disclosure.
  • the communication method could be performed at the terminal device and one of it objects is to enhance the one-shot HARQ feedback solution in, for example, the NR-U system.
  • the terminal device will receive a one-shot HARQ feedback trigger information from the network device. Different from the dynamic HARQ feedback, the one shot feedback is trigger by DCI. If the terminal device determines that a one-short feedback transmission is trigged by the network device, the terminal device might generate a one-shot HARQ feedback with a feedback value for a HARQ identity indicating an expected new data indication (NDI) value of the terminal device in block 820.
  • NDI expected new data indication
  • the NDI is a new data indication
  • the network device each time when the network transmits a new data, the network device will transmit a NDI with a value different from the last transmitted one. For example, if the last transmitted NDI is 0, the network device will transmit a NDI value of 1 to indicate a new data transmission and an NDI value of 0 to indicate a data retransmission. If the last transmitted NDI is 1, the network device will transmit a NDI value of 0 to indicate a new data transmission and an NDI value of 1 to indicate a data retransmission.
  • the expected NDI means the NDI value that the terminal device expects to receive from the network device.
  • the network device could learn the missed detection of DCI if the expected NDI is same as the current NDI or different from the NDI to be transmitted and learn the real feedback value of the last received data based on whether the NDI is changed. Only for illustrative purposes, reference will be made to Figs. 9A to 9D to describe several scenarios.
  • the terminal device will expect a new data transmission.
  • the expected NDI will be different from that of the last transmission, and it shall be 1.
  • the network device can know the missed detection of DCI because the expected NDI is the same as the NDI of the already transmitted data. That is to say, the terminal device still expects the already transmitted data, which in turn means the already transmitted data is never received by the terminal device.
  • the terminal device still expects the already transmitted data, which in turn means the already transmitted data is never received by the terminal device.
  • there is no missed detection of DCI as illustrated in lower drawing of Fig.
  • the network device can also know that because the expected NDI will be the same as the NDI to be transmitted by the network device. In addition, from the expected NDI, the network device could learn that the HARQ of the last received data is ACK since it expects new data transmission.
  • the network device can know the missed detection of DCI because the expected NDI is the same as the NDI of the already transmission data, which means the terminal device still expects the already transmitted data.
  • the network device can also know that because the expected NDI will be the same as the NDI to be transmitted by the network device. In addition, from the expected NDI, the network device could learn that the HARQ of the last received data is NACK since it does not expect new data transmission.
  • the expected value NDI of the terminals device will be different from those Fig. 9A and Fig. 9B.
  • the network device could still learn the missed detection based on the expected NDI and this is because the network could know, from the expected NDI, whether the terminal device expects the already transmitted data or the data to be transmitted; in addition, the network device can also know whether the HARQ feedback of the last received data is ACK or NACK based on whether it expects new data transmission.
  • the feedback value for a HARQ identity is determined based on an acknowledge information of a last received transmission concerning the HARQ identity and a corresponding NDI value.
  • the feedback value for a HARQ identity can be determined by performing an XOR operation on an acknowledge information of a last received transmission concerning the HARQ identity and the corresponding NDI value. According to the XOR operation, the resulting value will be 1 when the acknowledge information of the last received transmission concerning the HARQ identity is different from the corresponding NDI value and 0 when they are the same. By this means, the terminal device could generate the expected NDI value.
  • Fig. 10 illustrates a communication method 1000 according to embodiments of the present disclosure.
  • the communication method could be performed at the terminal device and one of it objects is to enhance the one-shot HARQ feedback solution in, for example, the NR-U system.
  • the network device transmits a downlink control indication to the terminal device, to trigger a one-short feedback transmission.
  • the network device receives a one-shot HARQ feedback from the terminal device.
  • the one-shot HARQ feedback has a feedback value for a HARQ identity indicating an expected NDI value of the terminal device.
  • the network Based on the expected NDI value indicated by the feedback, the network performs the following data retransmission based on the expected NDI value and a current NDI value in block 1030. Similar to those described with reference to Fig. 8 to 9D, the network device could learn the missed detection from the expected NDI.
  • the network could know whether the terminal device expects the already transmitted data or the data to be transmitted, if the terminal expects the already transmitted data, it means a missed detection of DCI.
  • the network device can also know whether the HARQ feedback of the last received transmission is ACK or NACK based on whether the expected NDI changes from the previous one. If it is NACK, the network device will retransmit the last received transmission, or otherwise perform a new data transmission.
  • apparatuses for performing the method 200, 300, 600, 800 or 1000 may include means for performing respective steps of the method 200, 300, 600, 800 or 1000.
  • the means may be implemented in any suitable form.
  • the means may be implemented in a circuitry or software module.
  • a communication apparatus may be comprised or implemented in a terminal device and one of its purpose is to provide improved HARQ feedback solution.
  • the communication apparatus may comprise means for receiving, from a network device, a feedback indication for a last transmitted Hybrid Automatic Repeat reQuest (HARQ) feedback of the terminal device, the feedback indication indicating whether the last transmitted HARQ feedback was received; means for determining, based on the received feedback indication, a downlink assignment index (DAI) value starting from which another HARQ feedback is to be generated, wherein the DAI value is a next DAI value of a DAI corresponding to a last received HARQ feedback of the network device; and means for generating the other HARQ feedback starting from the determined DAI.
  • DAI downlink assignment index
  • the means for determining, based on the received feedback indication, a downlink assignment index (DAI) may be further configured to: determine a DAI value of the last transmitted HARQ feedback; determine a DAI value of the last received HARQ feedback based on the determined DAI value of the last transmitted HARQ feedback and the received feedback indication; and determine a next DAI value of the determined DAI value of the last received HARQ feedback as the DAI value starting from which the other HARQ feedback is to be generated.
  • DAI downlink assignment index
  • the means for determining a DAI value of the last received HARQ feedback based on the determined DAI value of the last transmitted HARQ feedback and the received feedback indication may be further configured to: update the DAI value of the last received HARQ feedback with the determined DAI value of the last transmitted HARQ feedback in accordance with a determination that the received feedback indication is different from a previous one; or maintain the DAI value of the last received HARQ feedback in accordance with a determination that the received feedback indication is the same as the previous one.
  • the means for determining, based on the received feedback indication, a downlink assignment index (DAI) may be further configured to determine a next DAI value of a DAI corresponding to the last transmitted HARQ feedback; and determine, based on the determined next DAI value of the DAI corresponding to the last transmitted HARQ feedback and the received feedback indication, a next DAI value of a DAI corresponding to the last received HARQ feedback as the DAI value starting from which the other HARQ feedback is to be generated.
  • DAI downlink assignment index
  • the means for determining, based on the determined next DAI value of the DAI corresponding to the last transmitted HARQ feedback and the received feedback indication, the next DAI value of the DAI corresponding to the last received HARQ feedback may be further configured to update the next DAI value of the DAI corresponding to the last received HARQ feedback with the determined next DAI value of the DAI corresponding to the last transmitted HARQ feedback in accordance with a determination that the received feedback indication is different from a previous one; or maintain the next DAI value of the DAI corresponding to the last received HARQ feedback in accordance with the determination that the received feedback indication is the same as the previous one.
  • the communication apparatus may further comprise means for generating a one-shot HARQ feedback with a feedback value for a HARQ identity indicating an expected new data indication (NDI) value of the terminal device in accordance with a determination that a one-short feedback transmission is trigged by the network device.
  • NDI expected new data indication
  • the feedback value for a HARQ identity may be determined based on an acknowledge information of a last received transmission concerning the HARQ identity and a corresponding NDI value.
  • the feedback value for a HARQ identity is determined by performing an XOR operation on an acknowledge information of a last received transmission concerning the HARQ identity and the corresponding NDI value.
  • the other communication apparatus may be comprised or implemented in a network device and one of its purposes is to provide improved HARQ feedback solution.
  • the other communication apparatus may comprise means for transmitting a feedback indication for a last transmitted Hybrid Automatic Repeat reQuest (HARQ) feedback of a terminal device to the terminal device, the feedback indication indicating whether the last transmitted HARQ feedback was received; means for receiving another HARQ feedback from the terminal device; and means for determining a DAI value starting from which the other HARQ feedback was generated based on whether the last transmitted HARQ feedback was received, wherein the DAI value is a next DAI value of a DAI corresponding to a last received HARQ feedback of the network device.
  • HARQ Hybrid Automatic Repeat reQuest
  • the other communication apparatus may further comprise means for transmitting a downlink control indication to the terminal device, to trigger a one-short feedback transmission; means for receiving a one-shot HARQ feedback from the terminal device, the one-shot HARQ feedback having a feedback value for a HARQ identity indicating an expected NDI value of the terminal device; and means for performing data retransmission based on the expected NDI value and a current NDI value.
  • these apparatuses may include at least one processor.
  • the at least one processor suitable for use with embodiments of the present disclosure may include, by way of example, both general and special purpose processors already known or developed in the future.
  • These apparatuses may further include at least one memory.
  • the at least one memory may include, for example, semiconductor memory devices, e.g., RAM, ROM, EPROM, EEPROM, and flash memory devices.
  • the at least one memory may be used to store program of computer executable instructions.
  • the program can be written in any high-level and/or low-level compliable or interpretable programming languages.
  • the computer executable instructions may be configured, with the at least one processor, to cause these apparatuses to at least perform operations according to the method as discussed with reference to Figs. 1 to 10 respectively.
  • Fig. 11 schematically illustrates a simplified block diagram of a communication system 1100 that can implement the communication methods according to embodiments of the present disclosure.
  • the communication system 1100 include an apparatus 1110 that may be embodied as or included in a terminal device like UE described herein, an apparatus 1120 that may be embodied as or included in a network device like eNB or gNB.
  • the apparatus 1110 includes at least one processor 1111, such as a data processor (DP) and at least one memory (MEM) 1112 coupled to the processor 1111.
  • the apparatus 1110 may further include a transmitter TX and receiver RX 1113 coupled to the processor 1111, which may be operable to communicatively connect to the apparatus 1120.
  • the MEM 1112 stores a program (PROG) 1114.
  • the PROG 1114 may include instructions that, when executed on the associated processor 1111, enable the apparatus 1110 to operate in accordance with embodiments of the present disclosure, for example method 200, 300 or 800.
  • a combination of the at least one processor 1111 and the at least one MEM 1112 may form processing means 1115 adapted to implement various embodiments of the present disclosure.
  • the apparatus 1120 includes at least one processor 1121, such as a DP, and at least one MEM 1122 coupled to the processor 1121.
  • the apparatus 1120 may further include a suitable TX/RX 1123 coupled to the processor 1121, which may be operable for wireless communication with the apparatuses 1110.
  • the MEM 1122 stores a PROG 1124.
  • the PROG 1124 may include instructions that, when executed on the associated processor 1121, enable the apparatus 1120 to operate in accordance with the embodiments of the present disclosure, for example the method 600 or 1000.
  • a combination of the at least one processor 1121 and the at least one MEM 1122 may form processing means 1125 adapted to implement various embodiments of the present disclosure.
  • Various embodiments of the present disclosure may be implemented by computer program executable by one or more of the processors 1111 and 1121 software, firmware, hardware or in a combination thereof.
  • the MEMs 1112 and 1122 may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory, as non-limiting examples.
  • the processors 1111 and 1121 may be of any type suitable to the local technical environment, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors DSPs and processors based on multicore processor architecture, as non-limiting examples.
  • the present disclosure may also provide a carrier containing the computer program as mentioned above, wherein the carrier is one of an electronic signal, optical signal, radio signal, or computer readable storage medium.
  • the computer readable storage medium can be, for example, an optical compact disk or an electronic memory device like a RAM (random access memory) , a ROM (read only memory) , Flash memory, magnetic tape, CD-ROM, DVD, Blue-ray disc and the like.
  • an apparatus implementing one or more functions of a corresponding apparatus described with an embodiment comprises not only prior art means, but also means for implementing the one or more functions of the corresponding apparatus described with the embodiment and it may comprise separate means for each separate function, or means that may be configured to perform two or more functions.
  • these techniques may be implemented in hardware (one or more apparatuses) , firmware (one or more apparatuses) , software (one or more modules) , or combinations thereof.
  • firmware or software implementation may be made through modules (e.g., procedures, functions, and so on) that perform the functions described herein.

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

Abstract

Des modes de réalisation de la présente invention concernent des procédés, des dispositifs et un support associé lisible par ordinateur, pour des communications. Selon un mode de réalisation de la présente invention, un procédé de communication a lieu au niveau d'un dispositif terminal. Selon le procédé, le dispositif terminal reçoit une indication de rétroaction pour une dernière rétroaction transmise de demande automatique de répétition (HARQ) hybride du dispositif terminal à partir d'un dispositif de réseau, l'indication de rétroaction indiquant si la dernière rétroaction de HARQ transmise a été reçue. En fonction de l'indication reçue de rétroaction, le dispositif terminal détermine en outre une valeur d'indice d'attribution de liaison descendante (DAI), à partir de laquelle doit être générée une autre rétroaction de HARQ, la valeur de DAI étant une valeur suivante de DAI d'un DAI correspondant à une dernière rétroaction reçue de HARQ du dispositif de réseau. Puis le dispositif terminal génère l'autre rétroaction de HARQ à partir du DAI déterminé.
PCT/CN2019/109606 2019-09-30 2019-09-30 Procédés, dispositifs et supports associés lisible par ordinateur, pour des communications WO2021062707A1 (fr)

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