WO2020034573A1 - Indication de retransmission en liaison montante - Google Patents

Indication de retransmission en liaison montante Download PDF

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Publication number
WO2020034573A1
WO2020034573A1 PCT/CN2019/071451 CN2019071451W WO2020034573A1 WO 2020034573 A1 WO2020034573 A1 WO 2020034573A1 CN 2019071451 W CN2019071451 W CN 2019071451W WO 2020034573 A1 WO2020034573 A1 WO 2020034573A1
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WIPO (PCT)
Prior art keywords
resource
transmission
communication node
grant free
retransmission
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PCT/CN2019/071451
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English (en)
Inventor
Xing Liu
Peng Hao
Haigang HE
Kai Xiao
Xianghui HAN
Chenchen Zhang
Min Ren
Original Assignee
Zte Corporation
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Priority to CN201980088562.7A priority Critical patent/CN113287365B/zh
Priority to PCT/CN2019/071451 priority patent/WO2020034573A1/fr
Publication of WO2020034573A1 publication Critical patent/WO2020034573A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867—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
    • H04L5/0091—Signaling for the administration of the divided path
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0042—Arrangements for allocating sub-channels of the transmission path intra-user or intra-terminal allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H04W72/566—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient
    • H04W72/569—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient of the traffic information

Definitions

  • This patent document is directed generally to digital wireless communications.
  • This document relates to methods, systems, and devices related to digital wireless communication, and more specifically, to mechanisms for indicating uplink retransmissions.
  • a first method of wireless communication includes generating, at a first communication node, at least one indication of resource for uplink transmission based on a set of strategies including a first retransmission strategy.
  • the at least one indication includes a first Resource Indication (RI) to indicate at least one of (a) at least one target resource is preempted or (b) a retransmission of an initial transmission is required.
  • the method also includes transmitting, by the first communication node, the at least one indication.
  • the first communication node includes a base station.
  • the set of strategies further includes a second retransmission strategy, wherein in accordance with the second retransmission strategy, the at least one indication includes a second RI to indicate resource occupancy status of at least a Reference Uplink Resource (RUR) .
  • generating the at least one indication comprises making a selection between at least the first retransmission strategy and the second retransmission strategy.
  • making the selection is based, at least in part, on a pre-determined condition.
  • the pre-determined condition includes a threshold on a number of symbols of pre-configured grant free resource. In some embodiments, if the number of symbols of the pre-configured grant free resource is less than or equal to the threshold then the first retransmission strategy is selected. In some embodiments, if the number of symbols of the pre-configured grant free resource is greater than the threshold then the second retransmission strategy is selected.
  • making the selection is based, at least in part, on Radio Resource Control (RRC) signaling.
  • RRC Radio Resource Control
  • a value of one bit of the RRC signaling indicates the selection.
  • the first RI is transmitted between two adjacent uplink grant free transmissions. In some embodiments, the first of the two adjacent transmissions is the initial grant free transmission.
  • the method further includes causing a second communication node to perform the retransmission using the target resource based, at least in part, on the first RI.
  • the second communication node includes a grant free user equipment (UE) .
  • the second communication node detects the first RI in accordance with one or more monitoring occasions.
  • the one or more monitoring occasions are determined based, at least in part, on a sum of (a) a time delay caused by the first communication node to process data received via the initial transmission and (b) a time delay caused by the first communication node for generating the first RI.
  • the method further includes causing a third communication node to cancel or suspend transmission that uses the target resource based, at least in part, on the first RI.
  • the third communication node includes a grant based UE.
  • the one or more monitoring occasions are determined based, at least in part, on a sum of (a) a time delay caused by the third communication node to process the first RI and (b) a time delay for canceling transmission on the target resource.
  • the second RI indicates resource allocated to grant based transmission.
  • the method further includes causing a second communication node to change one or more transmission operations on the target resource based, at least in part, on the second RI.
  • changing the one or more transmission operations is based, at least in part, on an overlap between the resource allocated to grant based transmission and the target resource.
  • changing the one or more transmission operations includes at least one of switching to candidate resource or boosting transmission power.
  • a second method of wireless communication includes receiving, at a second communication node, at least one indication of resource for uplink transmission based on a set of strategies including a first retransmission strategy.
  • the at least one indication includes a first Resource Indication (RI) to indicate at least one of (a) at least one target resource is preempted or (b) a retransmission of an initial transmission is required.
  • the method also includes performing the retransmission, by the second communication node, based at least in part on the at least one indication.
  • the second communication node includes a user equipment (UE) .
  • the set of strategies further includes a second retransmission strategy, wherein in accordance with the second retransmission strategy, the at least one indication includes a second RI to indicate resource occupancy status of at least a Reference Uplink Resource (RUR) .
  • receiving the at least one indication comprises making a selection between at least the first retransmission strategy and the second retransmission strategy.
  • making the selection is based, at least in part, on a pre-determined condition.
  • the pre-determined condition includes a threshold on a number of symbols of pre-configured grant free resource. In some embodiments, if the number of symbols of the pre-configured grant free resource is less than or equal to the threshold then the first retransmission strategy is selected. In some embodiments, if the number of symbols of the pre-configured grant free resource is greater than the threshold then the second retransmission strategy is selected.
  • making the selection is based, at least in part, on Radio Resource Control (RRC) signaling.
  • RRC Radio Resource Control
  • a value of one bit of the RRC signaling indicates the selection.
  • the first RI is transmitted from a first communication node. In some embodiments, the first RI is transmitted between two adjacent uplink grant free transmissions and wherein the first of the two adjacent transmissions is the initial grant free transmission. In some embodiments, the method further includes performing the retransmission, by the second communication node, using the target resource based, at least in part, on the first RI. In some embodiments, receiving the at least one indication comprises detecting, by the second communication node, the first RI in accordance with one or more monitoring occasions.
  • the one or more monitoring occasions are determined based, at least in part, on a sum of (a) a time delay caused by the first communication node to process data received via the initial transmission and (b) a time delay caused by the first communication node for generating the first RI.
  • the second RI indicates resource allocated to grant based transmission.
  • the method further includes changing one or more transmission operations, by the second communication node, on the target resource based, at least in part, on the second RI.
  • changing the one or more transmission operations is based, at least in part, on an overlap between the resource allocated to grant based transmission and the target resource.
  • changing the one or more transmission operations includes at least one of switching to candidate resource or boosting transmission power.
  • an apparatus for wireless communication that is configured or operable to perform the above-described methods is disclosed.
  • the above-described methods are embodied in the form of processor-executable code and stored in a computer-readable program medium.
  • FIG. 1 illustrates an example method for using resource indication to perform retransmission and to indicate resource preemption, in accordance with some embodiments of the presently disclosed technology.
  • FIG. 2 illustrates a first retransmission strategy, in accordance with some embodiments of the presently disclosed technology.
  • FIG. 3 illustrates an example situation where the retransmission strategy of FIG. 2 is inapplicable, in accordance with some embodiments of the presently disclosed technology.
  • FIGS. 4 and 5 illustrate example methods for grant free User Equipment (UE) to determine monitoring occasions for receiving first Resource Indication (RI) , in accordance with some embodiments of the presently disclosed technology.
  • UE User Equipment
  • RI Resource Indication
  • FIGS. 6 and 7 illustrate example methods for grant based UE to determine monitoring occasions for receiving first RI, in accordance with some embodiments of the presently disclosed technology.
  • FIGS. 8-10 illustrative example methods for grant free UE to determine monitoring occasions for receiving second RI, in accordance with some embodiments of the presently disclosed technology.
  • FIG. 11 shows an example of a wireless communication system where techniques in accordance with one or more embodiments of the present technology can be applied.
  • FIG. 12 is a block diagram representation of a portion of a radio station.
  • the 4th Generation mobile communication technology (4G) Long-Term Evolution (LTE) and/or Long-Term Evolution Advance (LTE-Advance/LTE-A) , and the 5th Generation mobile communication technology (5G) are faced with ever increasing demand in various aspects.
  • 4G and/or 5G systems are looking to support enhanced mobile broadband, ultra-high reliability, ultra-low latency transmission, and massive connectivity.
  • certain high-priority traffic e.g., low-latency and high-reliability traffic
  • preemption of at least some part of resource (s) for transmitting the low-latency and high-reliability traffic can be conducted before other traffic (s) (e.g., with longer transmission times) is transmitted or while the other traffic (s) is being transmitted.
  • preemption indication information can be communicated to the preempted transmission user (s) .
  • the transmission of traffic with longer transmission time interval or the uplink transmission of traffic with lower reliability requirement will be canceled or suspended, avoiding simultaneous transmission using the same resource (s) which is used for low-latency and high-reliability traffic and thus preventing and/or mitigating performance degradation.
  • M represents the number of blocks partitioned in the time domain
  • N represents the number of blocks partitioned in the frequency domain.
  • Uplink transmission typically includes two types: grant based uplink transmission and grant free uplink transmission.
  • the grant based uplink transmission typically refers to uplink transmission performed by a user equipment (UE) (or terminal) according to uplink grant made by a corresponding base station, in which transmission resource is predetermined.
  • the grant free uplink transmission typically refers to uplink transmission by a UE that autonomously selects from a set of semi-statically configured, grant free resources.
  • the base station cannot predetermine which candidate resource a specific transmission occurs on. Therefore, when certain high-priority grant free uplink transmission overlaps in transmission resources with other low-priority transmission (s) , the base station may not be able to notify preempted user (s) in advance.
  • a UE can increase the transmission power of the high-priority grant free uplink transmission, thereby providing better transmission performance. Since various transmission types can coexist in a same carrier, various resolution mechanisms as well as their associated indication methods can be introduced. The presently disclosed technology addresses these issues.
  • multiple grant free retransmission strategies can be defined. For example:
  • Retransmission strategy 1 Between the two uplink (UL) grant free transmissions, base station (e.g., gNB) uses first Resource Indication (RI) to indicate to associated UE of grant based service whether certain resource is preempted, and whether the grant free transmission requires a retransmission.
  • base station e.g., gNB
  • RI Resource Indication
  • Retransmission strategy 2 Base station uses second RI to indicate to associated grant free UE the resource occupancy status of Reference Uplink Resource that has been allocated to grant based transmission.
  • the grant free UE determines whether certain grant free resource overlaps with the allocated grant based transmission resource in order to determine whether it should change its grant free transmission strategy.
  • selection from the retransmission strategies can be determined based on a predetermined condition and/or Radio Resource Control (RRC) signaling.
  • the predetermined condition can be a threshold number of symbols of grant free resource. For example, when the number of symbols of configured grant free resource is greater than a threshold, retransmission strategy 2 is used; otherwise, retransmission strategy 1 is used.
  • the presently disclosed technology further includes the determination of monitoring timing of the first RI by the two types (i.e., grant based and grant free) of UE, as well as the determination of monitoring timing of the second RI by grant free UE.
  • FIG. 1 illustrates a method for using resource indication to perform retransmission and to indicate resource preemption, in accordance with some embodiments of the presently disclosed technology.
  • the resources (i.e., 1st resource and 2nd resource) in the dotted line boxes 102a and 102b are two resources that are pre-configured for adjacent uplink grant free transmissions.
  • resources for two adjacent transmissions occupy corresponding symbols of adjacent time slots.
  • the 1st resource is used for initial grant free transmission and the 2nd resource is used for first grant free retransmission, then when uplink grant free traffic arrives, a UE selects the 1st resource for initial transmission. If an associated base station (e.g., gNB) detects the grant free transmission on the 1st resource but does not receive the transmission correctly, it reserves the 2nd resource for retransmission of the grant free traffic.
  • gNB base station
  • the gNB can use an RI to indicate to UE (e.g., a grant based UE) scheduled to be in slot 2 that the 2nd resource is preempted by the grant free service; the gNB can also use the same RI to indicate to the grant free UE (which performed the initial grant free transmission) whether retransmission is required.
  • the grant free UE after the initial transmission, the grant free UE also monitors for the RI, and detects the RI.
  • the resource (s) indicated in the RI includes the 2nd resource, then the grant free UE needs to retransmit the grant free traffic on the 2nd resource.
  • the RI can be used to indicate the occupation information of the grant free service in a future time-frequency resource.
  • the RI can be downlink control information (DCI) carried on a Physical Downlink Control Channel (PDCCH)
  • DCI downlink control information
  • CRC cyclic redundancy check
  • RNTI Radio Network Temporary Identifier
  • the base station does not (or does not need to) send the RI. Accordingly, the grant free UE does not detect the RI, and does not (or does not need to) retransmit the grant free traffic.
  • the 2nd resource can be scheduled to slot 2 for use by grant based service.
  • the grant free UE detects the RI, but the resource (s) indicated in the RI does not include the 2nd resource, then the grant free UE does not (or does not need to) retransmit the grant free traffic on the 2nd resource.
  • the above mentioned detection of grant free transmission by the gNB includes or corresponds to the detection of grant free transmission of data carried on Physical Uplink Shared Channel (PUSCH) .
  • the gNB can determine whether there is a grant free transmission by monitoring a Demodulation Reference Signal (DMRS) carried on the PUSCH.
  • DMRS Demodulation Reference Signal
  • a situation where the gNB successfully detects the PUSCH DMRS but fails to decode the PUSCH corresponds to base station (e.g., gNB) detecting the grant free transmission on the 1st resource but not receiving the transmission correctly, as described above.
  • the threshold on grant free resource symbol number can be defined in advance.
  • the threshold can be pre-defined in a protocol, or a gNB can indicate the threshold to UE through RRC signaling, a physical layer signal, or a physical layer channel.
  • the threshold number of grant free resource symbols is 2 symbols.
  • retransmission strategy selection can be based on whether the number of symbols of pre-configured grant free resource is (a) less than or equal to the threshold or (b) greater than the threshold.
  • FIG. 2 illustrates a first retransmission strategy, in accordance with some embodiments of the presently disclosed technology.
  • retransmission strategy 1 is described as follows: when the number of pre-configured grant free resource symbols is less than or equal to the threshold (e.g., 2 symbols) , grant free UE detects first RI on the Nth symbol after the grant free UE’s initial transmission in order to determine whether to perform retransmission on the 2nd resource.
  • the number of symbols of pre-configured grant free resource is 2.
  • the gNB detects the grant free transmission on the 1st resource, but does not receive the transmission correctly, the corresponding 2nd resource needs to be reserved for retransmission of the grant free traffic.
  • the gNB generates the first RI information.
  • the delay caused by the gNB for decoding the data received on the 1st resource and for generating the RI information is N1
  • the transmission position of the first RI should be greater than or equal to N1 when measured from the 1st resource end symbol.
  • the value of N1 is 4.5 symbols at the 30 kHz subcarrier spacing, then the start symbol of the first RI can be configured on the 6th symbol after the 1st resource.
  • the first RI includes the 2nd resource information that needs to be occupied by the grant free retransmission.
  • the Grant free UE (which performed the initial grant free transmission) and any grant based UE that is scheduled to perform UL transmission on the 2nd resource can monitor and detect the first RI.
  • the grant based UE can cancel its transmission on the 2nd resource according to the first RI.
  • the shadowed area 202 represents uplink transmission resource that is pre-scheduled to the grant free UE, and data transmission on the overlapping area between the 2nd resource (as indicated by the dotted line box 204) and the shadowed area is canceled.
  • the grant free UE determines whether the first RI indicates the entire 2nd resource that is pre-configured to the grant free UE. If it is so indicated, then the grant free UE will perform retransmission on the 2nd resource.
  • the first RI can meet certain processing delay requirements.
  • the first RI should occur at least a certain time prior to the transmission that is to be canceled. This time difference can be greater than or equal to the sum of (a) the time delay caused by the grant based UE to process the first RI and (b) the delay needed for canceling data transmission on the corresponding resource.
  • the delay of processing the first RI corresponds to the delay of decoding the PDCCH.
  • the delay in processing the first RI corresponds to the delay in sequence detection. With reference to FIG. 2, assuming that this time delay is N2, and the value of N2 is 5.5 symbols at 30 kHz, then the grant based transmission that can be canceled by the first RI is at least 6 symbols apart from the first RI.
  • the grant free transmission does not need to be retransmitted, and the 2nd resource can be allocated to grant based services according to pre-scheduling information.
  • the gNB does not (or does not need to) generate and transmit the first RI. Accordingly, although the grant free UE and the grant based UE that is scheduled to perform UL transmission on the 2nd resource can still monitor for (e.g., passively listen for) the first RI on the corresponding resource, the grant free UE and the grant based UE will not detect the first RI.
  • the grant free UE will not perform retransmission, and the grant based UE will not cancel the transmission scheduled on the 2nd resource.
  • the gNB does not detect any grant free transmission on the 1st resource, it will not generate and transmit the first RI.
  • retransmission strategy 1 meets certain timing requirements. More specifically, the time interval between two adjacent transmissions is greater than or equal to where N RI is the number of symbols of the first RI. In other words, the number of symbols of the grant free and the threshold on the grant free resource number is pre-determined to meet these timing requirements.
  • retransmission strategy 2 in accordance with some embodiments of the presently disclosed technology is described as follows: when the number of pre-configured grant free resource symbols is greater than the threshold, the scheduled grant based transmission may not be reliably or effectively canceled by sending the first RI between transmissions. That is, as shown in FIG. 3, after the first RI is detected, the grant based UE does not have sufficient time to cancel the transmission before it occurs on the 2nd resource. Therefore, in this case, the grant free UE can determine how to perform its transmission based on the resource occupancy status of the grant based transmission in slot 2.
  • the grant free UE can receive a second RI that indicates a resource set.
  • the second RI can indicate resource allocation in a predefined area for grant based transmission. If the resource allocated to the grant based transmission overlaps with the 2nd resource, the grant free UE can change its transmission operation (s) , for example, by boosting transmission power or switching to candidate or backup resource (s) .
  • the candidate or backup resource (s) can be another set of grant free resources configured by RRC signaling to the grant free UE, or grant free resource (s) indicated to the grant free UE in the DCI.
  • the grant free UE does not change its transmission operation with respect to the 2nd resource, for example, by using the same modulation and coding scheme (MCS) as on the 1st resource.
  • MCS modulation and coding scheme
  • thresholds such as, threshold of time interval between two adjacent transmissions can be used for making selection (s) between retransmission strategies. For example, if the time interval between two adjacent transmissions is greater than or equal to certain time interval threshold, retransmission strategy 1 is selected. Otherwise, retransmission strategy 2 is selected.
  • an information element (IE) for specifying a retransmission strategy is defined in the RRC signaling.
  • IE information element
  • 1 bit can be used to indicate whether to use the retransmission strategy 1 or the retransmission strategy 2, respectively, as described in accordance with the Second Embodiment.
  • a bit value of “0” can represent the retransmission strategy, where the grant free UE and the grant based UE both monitor for the first RI.
  • the grant based UE cancels its transmission on the 2nd resource according to the first RI.
  • the shadowed area represents uplink transmission resource that is pre-scheduled to the grant based UE, and data transmission on the overlapping area between the 2nd resource (as indicated by the dotted line box 204) and the shadowed area 202 is canceled.
  • the grant free UE determines whether the first RI indicates the entire 2nd resource that is pre-configured to the grant free UE. If so, the grant free UE will perform retransmission on the 2nd resource.
  • a bit value of “1” can stand for the retransmission strategy 2, where the grant free UE monitors for the second RI. If the resource indicated in the second RI that has been allocated to grant based transmission overlaps with the 2nd resource, the grant free UE will change its transmission operation (s) . Otherwise, the grant free UE does not change its transmission operation (s) on the 2nd resource.
  • the grant free UE should determine which resource (s) to monitor the first RI.
  • resource (s) there are three ways to achieve this:
  • Method 1 as shown in FIG. 4, illustratively, grant free resource is configured with 1 symbol located on symbol #7.
  • the starting symbol of the first RI is defined as a symbol that is separated from the 1st resource (or the previous transmission) by N symbols.
  • N 1 is the time delay caused by a corresponding gNB to decode the data received on the 1st resource and to generate the first RI indication information.
  • the starting symbol index of the first RI is When the first RI starts in the same slot as the 2nd resource (or the starting symbol of the first RI is in a slot subsequent to the slot where the 1st resource resides) ; when the first RI starts in the same slot as the 1 st resource (or the starting symbol of the first RI is in a slot preceding the slot where the 2nd resource resides) .
  • Method 2 as shown in FIG. 5, illustratively, grant free resource is configured with 1 symbol located on symbol #7.
  • the end symbol of the first RI is defined as a symbol that is separated from starting symbol of the 2nd resource (or retransmission resource) by M symbols.
  • N 2 is the sum of (a) the time delay caused by the grant based UE to process the first RI and (b) the time delay for canceling the data transmission on the corresponding resource.
  • the delay of processing the first RI corresponds to the delay of decoding the PDCCH.
  • the delay in processing the first RI corresponds to the delay in sequence detection.
  • the starting symbol index of the 2nd resource is m
  • the starting symbol index of the first RI is where N RI is the number of symbols of the first RI.
  • Method 3 The interval between the first RI and the 1st resource and/or the interval between the first RI and the 2nd resource can be configured using RRC signaling.
  • the grant based UE can determine which resource (s) to monitor the first RI.
  • resource (s) can be determined from the first RI.
  • Method 1 as shown in FIG. 6, illustratively, grant based resource is configured with 1 symbol.
  • the end symbol of the first RI is defined as a symbol that is separated from the starting symbol of the 2nd resource (or retransmission resource) by M.
  • N 2 is the sum of (a) the time delay caused by the grant based UE to process the first RI and (b) the time delay for canceling the data transmission on the corresponding resource.
  • the delay of processing the first RI corresponds to the delay of decoding the PDCCH.
  • the delay in processing the first RI corresponds to the delay in sequence detection.
  • the start symbol index for grant based UE to monitor the first RI is m, which can be calculated as follows:
  • N RI is the number of symbols of the first RI. If the first RI resides in the same slot as the grant based resource; otherwise, the first RI resides in a slot preceding the slot where the grant based resource resides. Because there can be multiple grant free resources that overlap with the grant based resource, n can take multiple values that lead to different values for m, where the grant based UE monitors for the first RI.
  • Method 2 as shown in FIG. 7, illustratively, grant based resource is configured with 1 symbol.
  • the starting symbol of the first RI is defined as a symbol that is separated from the 1st resource (or the previous transmission) by N.
  • N 1 is the time delay caused by a corresponding gNB to decode the data received on the 1st resource and to generate the first RI indication information.
  • the start symbol index for grant based UE to listen to the first RI is m, which can be calculated as follows:
  • n can take multiple values that lead to different values for m, where the grant based UE monitors for the first RI.
  • the grant free UE can determine which resource (s) to use for listening to the second RI.
  • resource (s) can be determined from the grant free UE.
  • both RI1 and RI2 are the second RI, and the monitoring occasion for the second RI is the same as the PDCCH for scheduling grant based transmissions.
  • the Reference Uplink Resource (RUR) area 802 (which is surrounded by dotted lines) is the indication area corresponding to RI1, that is, RI1 indicates all grant based transmissions that are scheduled to range of area 802.
  • the RUR is separated from its corresponding RI by N symbols. For example, where N 2 is the sum of (a) the time delay caused by the grant based UE to process the first RI and (b) the time delay for canceling data transmission on the corresponding resource.
  • the delay of processing the second RI corresponds to the delay of decoding the PDCCH.
  • the delay in processing the second RI corresponds to the delay in sequence detection.
  • the time domain length of the RUR is equal to the monitoring period of the second RI or the time offset between two neighboring second RIs.
  • the grant free UE can monitor for the second RI corresponding to the RUR where the grant free resource is located.
  • the grant free resource of the grant free UE is indicated by the shaded area 804, and the RUR of the grant free UE corresponds to one of the second RIs, i.e., RI1. Therefore, the grant free UE monitors for RI1.
  • the grant free UE when grant free resource spans multiple RURs, the grant free UE can monitor for all second RIs that indicate grant free resource information. Specifically, with reference to FIG. 9, the grant free resource partly resides in RUR1 and partly resides in RUR2. Therefore, the grant free UE can monitor for both second RIs, i.e., RI1 and RI2.
  • a second RI monitoring configuration is bound to a grant free resource.
  • a grant free resource includes two symbols and the RURs are divided by the time domain granularity of grant free resource.
  • the entire RUR corresponds to uplink BWP or uplink carrier in the frequency domain.
  • Each RUR corresponds to a second RI, and the second RI indicates the resource allocation of grant based transmission in the corresponding RUR range.
  • the grant free UE can only monitor for a specific second RI corresponding to the RUR of the grant free resource that the grant free UE expects to occupy.
  • the grant free UE’s uplink grant free traffic arrives and it is expected to occupy grant free resource1, and the grant free resource1 belongs to RUR1 which corresponds to RI1. Accordingly, the grant free UE first listens to RI1 before using the grant free resource1 to send the uplink traffic. If the resource indicated by RI1 as assigned to grant based transmission overlaps with the grant free resource1, then in order to provide quality performance of the grant free transmission, the grant free UE can change its transmission operation (s) , for example, by switching transmission resources according to predefined rules, or by performing power boost transmission (s) .
  • FIG. 11 shows an example of a wireless communication system where techniques in accordance with one or more embodiments of the present technology can be applied.
  • a wireless communication system 1100 can include one or more base stations (BSs) 1105a, 1105b, one or more wireless devices (e.g., UEs or terminals) 1110a, 1110b, 1110c, 1110d, and an access network 1125.
  • a base station 1105a, 1105b can provide wireless service to wireless devices 1110a, 1110b, 1110c and 1110d in one or more wireless sectors.
  • a base station 1105a, 1105b includes directional antennas to produce two or more directional beams to provide wireless coverage in different sectors.
  • the access network 1125 can communicate with one or more base stations 1105a, 1105b.
  • the access network 1125 includes one or more base stations 1105a, 1105b.
  • the access network 1125 is in communication with a core network (not shown in FIG. 11) that provides connectivity with other wireless communication systems and wired communication systems.
  • the core network may include one or more service subscription databases to store information related to the subscribed wireless devices 1110a, 1110b, 1110c and 1110d.
  • a first base station 1105a can provide wireless service based on a first radio access technology, whereas a second base station 1105b can provide wireless service based on a second radio access technology.
  • the base stations 1105a and 1105b may be co-located or may be separately installed in the field according to the deployment scenario.
  • the access network 1125 can support multiple different radio access technologies.
  • a wireless communication system can include multiple networks using different wireless technologies.
  • a dual-mode or multi-mode wireless device includes two or more wireless technologies that could be used to connect to different wireless networks.
  • FIG. 12 is a block diagram representation of a portion of a radio station (e.g., a type of wireless communication node) .
  • a radio station 1205 such as a base station or a terminal (or UE) can include processor electronics 1210 such as a microprocessor that implements one or more of the wireless techniques presented in this document.
  • the radio station 1205 can include transceiver electronics 1215 to send and/or receive wireless signals over one or more communication interfaces such as antenna 1220.
  • the radio station 1205 can include other communication interfaces for transmitting and receiving data.
  • Radio station 1205 can include one or more memories (not explicitly shown) configured to store information such as data and/or instructions.
  • the processor electronics 1210 can include at least a portion of the transceiver electronics 1215. In some embodiments, at least some of the disclosed techniques, modules or functions are implemented using the radio station 1205.
  • a computer-readable medium may include removable and non-removable storage devices including, but not limited to, Read Only Memory (ROM) , Random Access Memory (RAM) , compact discs (CDs) , digital versatile discs (DVD) , etc. Therefore, the computer-readable media can include a non-transitory storage media.
  • program modules may include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types.
  • Computer-or processor-executable instructions, associated data structures, and program modules represent examples of program code for executing steps of the methods disclosed herein. The particular sequence of such executable instructions or associated data structures represents examples of corresponding acts for implementing the functions described in such steps or processes.
  • a hardware circuit implementation can include discrete analog and/or digital components that are, for example, integrated as part of a printed circuit board.
  • the disclosed components or modules can be implemented as an Application Specific Integrated Circuit (ASIC) and/or as a Field Programmable Gate Array (FPGA) device.
  • ASIC Application Specific Integrated Circuit
  • FPGA Field Programmable Gate Array
  • DSP digital signal processor
  • the various components or sub-components within each module may be implemented in software, hardware or firmware.
  • the connectivity between the modules and/or components within the modules may be provided using any one of the connectivity methods and media that is known in the art, including, but not limited to, communications over the Internet, wired, or wireless networks using the appropriate protocols.

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

Abstract

La présente invention concerne des procédés, des systèmes et des dispositifs associés à une communication sans fil numérique. Un procédé de communication sans fil donné à titre d'illustration consiste à générer, au niveau d'un premier nœud de communication, au moins une indication de ressource pour une transmission en liaison montante sur la base d'un ensemble de stratégies comprenant une première stratégie de retransmission. Selon la première stratégie de retransmission, la ou les indications comprennent une première indication de ressource (RI) pour indiquer si au moins une ressource cible est préemptée et/ou si une transmission initiale nécessite une retransmission. Le procédé donné à titre d'illustration consiste également à transmettre, par le premier nœud de communication, la ou les indications.
PCT/CN2019/071451 2019-01-11 2019-01-11 Indication de retransmission en liaison montante WO2020034573A1 (fr)

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PCT/CN2019/071451 WO2020034573A1 (fr) 2019-01-11 2019-01-11 Indication de retransmission en liaison montante

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US20180139774A1 (en) * 2016-11-15 2018-05-17 Huawei Technologies Co., Ltd. Systems and methods for grant-free uplink transmissions
CN108242970A (zh) * 2016-12-26 2018-07-03 上海诺基亚贝尔股份有限公司 基于资源单位的非许可传输的反馈方法及设备
WO2018129334A1 (fr) * 2017-01-06 2018-07-12 Idac Holdings, Inc. Procédures d'atténuation de collision pour accès multiple en liaison montante sans autorisation
WO2018171242A1 (fr) * 2017-03-23 2018-09-27 Huawei Technologies Co., Ltd. Configuration, indication et ack/nack pour transmission multiple sans autorisation harq

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CN105992373B (zh) * 2015-01-30 2020-09-15 中兴通讯股份有限公司 数据传输方法、装置、基站及用户设备
WO2017011944A1 (fr) * 2015-07-17 2017-01-26 华为技术有限公司 Procédé et appareil d'acquisition d'informations de configuration
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US20180139774A1 (en) * 2016-11-15 2018-05-17 Huawei Technologies Co., Ltd. Systems and methods for grant-free uplink transmissions
CN108242970A (zh) * 2016-12-26 2018-07-03 上海诺基亚贝尔股份有限公司 基于资源单位的非许可传输的反馈方法及设备
WO2018129334A1 (fr) * 2017-01-06 2018-07-12 Idac Holdings, Inc. Procédures d'atténuation de collision pour accès multiple en liaison montante sans autorisation
WO2018171242A1 (fr) * 2017-03-23 2018-09-27 Huawei Technologies Co., Ltd. Configuration, indication et ack/nack pour transmission multiple sans autorisation harq

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