WO2018174766A1 - Systèmes et procédés pour commander un renvoi de harq lorsque nr et lte coexistent sur le même support - Google Patents

Systèmes et procédés pour commander un renvoi de harq lorsque nr et lte coexistent sur le même support Download PDF

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Publication number
WO2018174766A1
WO2018174766A1 PCT/SE2017/051349 SE2017051349W WO2018174766A1 WO 2018174766 A1 WO2018174766 A1 WO 2018174766A1 SE 2017051349 W SE2017051349 W SE 2017051349W WO 2018174766 A1 WO2018174766 A1 WO 2018174766A1
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Prior art keywords
radio access
access network
access technology
downlink
uplink
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PCT/SE2017/051349
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English (en)
Inventor
Iana Siomina
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Telefonaktiebolaget Lm Ericsson (Publ)
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1215—Wireless traffic scheduling for collaboration of different radio technologies
    • 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
    • H04L1/189—Transmission or retransmission of more than one copy of a message
    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks

Definitions

  • New Radio NR
  • Long Term Evolution LTE
  • Hybrid Automatic Repeat Request HARQ
  • New Radio which is also known as Fifth Generation (5G) or Next Generation
  • 5G Fifth Generation
  • Next Generation architecture is being discussed in Third Generation Partnership Project (3GPP).
  • 3GPP Third Generation Partnership Project
  • eNB enhanced or evolved Node B
  • LTE Long Term Evolution
  • gNB denotes a NR base station where one NR base station may correspond to one or more transmission/reception points
  • the lines between the nodes illustrate the corresponding interfaces which are under discussion in 3GPP.
  • Figure 2 illustrates deployment scenarios with NR base stations which are discussed in 3GPP.
  • Multi-antenna schemes for NR are currently being discussed in 3GPP.
  • frequency ranges up to 100 gigahertz (GHz) are considered. It is known that high-frequency radio communication above 6 GHz suffers from significant path loss and penetration loss.
  • One solution to address this issue is to deploy large-scale antenna arrays to achieve high beamforming gain, which is a reasonable solution due to the small wavelength of high-frequency signal.
  • MIMO Multiple Input Multiple Output
  • Tx transmit
  • Rx receive
  • Extension to support 1024 Tx at 70 GHz is agreed and it is under discussion for 30 GHz.
  • sub-6 GHz communication to obtain more beamforming and multiplexing gain by increasing the number of antenna elements is also a trend.
  • analog beamforming would compensate high pathloss in NR scenarios, while digital precoding would provide additional performance gains similar to MIMO for sub-6 GHz necessary to achieve a reasonable coverage.
  • digital precoding would provide additional performance gains similar to MIMO for sub-6 GHz necessary to achieve a reasonable coverage.
  • the implementation complexity of analog beamforming is significantly less than digital precoding since in many implementations it relies on simple phase shifters, but the drawbacks are its limitation in multi-direction flexibility (i.e., a single beam can be formed at a time and the beams are then switched in the time domain), only wideband transmissions (i.e., not possible to transmit over a sub-band), unavoidable inaccuracies in the analog domain, etc.
  • Digital beamforming (requiring costly converters to/from the digital domain from/to Intermediate Frequency (IF) domain), used today in LTE, provides the best performance in terms of data rate and multiplexing capabilities (multiple beams over multiple sub-bands at a time can be formed), but at the same time it is challenging in terms of power consumption, integration, and cost; in addition to that the gains do not scale linearly with the number of transmit/receive units while the cost is growing rapidly. Supporting hybrid beamforming, to benefit from cost-efficient analog beamforming and high-capacity digital beamforming, is therefore desirable for NR.
  • An example diagram for hybrid beamforming is shown in Figure 3.
  • Beamforming can be on transmission beams and/or reception beams, network side or User Equipment device (UE) side.
  • UE User Equipment device
  • the analog beam of a subarray can be steered toward a single direction on each Orthogonal Frequency Division Multiplexing (OFDM) symbol, and hence the number of subarrays determines the number of beam directions and the corresponding coverage on each OFDM symbol.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the number of beams to cover the whole serving area is typically larger than the number of subarrays, especially when the individual beam width is narrow. Therefore, to cover the whole serving area, multiple transmissions with narrow beams differently steered in the time domain are also likely to be needed.
  • the provision of multiple narrow coverage beams for this purpose has been called "beam sweeping" (see, e.g., Figures 4A and 4B).
  • the beam sweeping seems to be essential to provide the basic coverage in NR.
  • multiple OFDM symbols in which differently steered beams can be transmitted through subarrays, can be assigned and periodically transmitted.
  • the term “numerology” includes, e.g., the following elements: frame duration, subframe or Transmit Time Interval (TTI) duration, slot duration, subcarrier spacing, Cyclic Prefix (CP) length, number of subcarriers per
  • TTI Time Interval
  • CP Cyclic Prefix
  • RB Resource Block
  • numerologies may result in different numbers of RBs within the same bandwidth), number of symbols within a certain time unit, e.g., 1 millisecond (ms) subframe, symbol length, etc.
  • RATs Radio Access Technologies
  • performance targets e.g., performance requirements impose constraints on usable subcarrier spacing sizes, e.g., the maximum acceptable phase noise sets the minimum subcarrier bandwidth while the slow decay of the spectrum (impacting filtering complexity and guardband sizes) favors smaller subcarrier bandwidth for a given carrier frequency, and the required CP sets the maximum subcarrier bandwidth for a given carrier frequency to keep overhead low.
  • the numerology used so far in the existing RATs is rather static and typically can be trivially derived by the UE, e.g., by one-to-one mapping to RAT, frequency band, service type (e.g., Multimedia
  • MBMS Broadcast/Multicast Service
  • the subcarrier spacing is 15 kilohertz (kHz) for normal CP and 15 kHz and 7.5 kHz (i.e., the reduced carrier spacing) for extended CP, where the latter is allowed only for MBMS-dedicated carriers.
  • kHz kilohertz
  • 7.5 kHz i.e., the reduced carrier spacing
  • NR which is to be based on OFDM
  • multiple numerologies will be supported for general operation.
  • a scaling approach (based on a scaling factor 2 ⁇ ⁇ , n G N 0 ) is considered for deriving subcarrier spacing candidates for NR.
  • Values for subcarrier bandwidths currently discussed include, among others, 3.75 kHz, 15 kHz, 30 kHz, and 60 kHz.
  • the numerology-specific slot durations can then be determined in ms based on the subcarrier spacing: subcarrier spacing of (2 m* 15) kHz gives exactly 1 /2 m 0.5 ms for a slot that is 0.5 ms in the 15 kHz numerology.
  • Subcarrier spacings of at least up to 480 kHz are currently being discussed for NR (the highest discussed values correspond to millimeter-wave based technologies). It was also agreed that multiplexing different numerologies within a same NR carrier bandwidth is supported, and Frequency Domain
  • FDM Frequency Division Multiplexing
  • TDM Time Domain Multiplexing
  • Evolved Universal Terrestrial Radio Access Network provides Automatic Repeat Request (ARQ) and Hybrid ARQ (HARQ)
  • the ARQ functionality provides error correction by retransmissions in acknowledged mode at Layer 2.
  • HARQ is an N-process Stop-And-Wait, and it transmits and retransmits transport blocks.
  • the receiver Upon reception of a transport block, the receiver makes an attempt to decode the transport block and informs the transmitter about the outcome of the decoding operation through a single Acknowledgement/Negative Acknowledgement (ACK/NACK) bit indicating whether the decoding was successful or if a retransmission of the transport block is required.
  • ACK/NACK Acknowledgement/Negative Acknowledgement
  • the HARQ functionality ensures delivery between peer entities at Layer 1 , and independent HARQ processes are used for downlink and uplink transmission delivery per cell.
  • CA Carrier Aggregation
  • HARQ is supported for the Downlink Shared Channel (DL-SCH) and Uplink Shared Channel (UL-SCH) transport channels transmitted in Physical Downlink Shared Channel (PDSCH) and Physical Uplink Shared Channel (PUSCH) physical channels, respectively, e.g.:
  • HARQ may be used for dynamically scheduled downlink and/or uplink transmissions.
  • a UE always monitors the Physical Downlink Control Channel(s) (PDCCH(s)) to find possible allocations for downlink and/or uplink.
  • PDCCH(s) Physical Downlink Control Channel
  • ⁇ HARQ may be used for semi-persistently allocated downlink and/or uplink transmissions.
  • PDCCH indicates whether the downlink/uplink grant is a semi-persistent one, i.e., whether it can be implicitly reused in the following TTIs according to the periodicity defined by Radio Resource Control (RRC).
  • RRC Radio Resource Control
  • retransmissions are explicitly signaled via the PDCCH(s).
  • C-RNTI Cell Radio Network Temporary Identifier
  • HARQ is used for contention-based Random Access (RA) transmissions, both for the first scheduled uplink transmission (e.g., for initial access, after handover, or RRC connection reestablishment) and for contention resolution in downlink (where HARQ feedback is transmitted only by the UE which detects its own UE identity, as provided in message 3, echoed in the Contention Resolution message).
  • HARQ failure in the first uplink transmission step or in the contention resolution step may result, e.g., in a
  • ACK/NACK feedback is used, e.g., in LTE, by the intended receiving node to inform a transmitting node that its transmission has been or has not been successfully received.
  • the ACK/NACKs may be transmitted in response to downlink or uplink transmissions by the UE (via uplink control channel or data channel) or eNB (via Physical HARQ Indicator Channel (PHICH)), respectively.
  • PHICH Physical HARQ Indicator Channel
  • FDD Frequency Division Duplexing
  • the UE transmits the feedback in subframe (n+4) for the downlink reception in subframe n.
  • TDD Time Division Duplexing
  • TDD Time Division Duplexing
  • the timing relation between reception of data at the UE and transmission of HARQ A/N in the uplink is also predefined, e.g., in Narrowband Internet of Things (NB-loT) the ACK/NACK is sent in subframe n+12.
  • NB-loT Narrowband Internet of Things
  • Asynchronous adaptive HARQ is used for DL-SCH transmission (see Figure 6A), implying asynchronous retransmissions and synchronous HARQ feedback.
  • Uplink ACK NACKs in response to downlink (re)transmissions are sent on Physical Uplink Control Channel (PUCCH) or PUSCH.
  • PUCCH Physical Uplink Control Channel
  • PDCCH signals the HARQ process number and also indicates if it is a transmission or retransmission. Retransmissions are always scheduled through PDCCH.
  • Synchronous HARQ is used for UL-SCH transmission, implying synchronous retransmissions and synchronous HARQ feedback, i.e., the time instant for the retransmissions is fixed once the initial transmission has been scheduled and known to both UE and eNB (see Figure 6B) and hence no need to signal HARQ process number.
  • the maximum number of retransmissions is configured per UE.
  • TTI bundling may be used, by which multiple HARQ transmission attempts in consecutive TTIs before receiving HARQ feedback may be configured.
  • An example is illustrated in Figure 6C, where a bundle comprises sending four Redundancy Versions (RVs) in four consecutive TTIs.
  • RVs Redundancy Versions
  • the retransmission of the bundle is delayed, which is because the shortest HARQ Round Trip Time (RTT) with the bundle of size of 4 is 1 1 ms which cannot be synchronized with the normal HARQ RTT of 8 ms and thus a period of 16 ms should be configured.
  • the time slots in between can be used for some other bundled HARQ processes from the given UE or other UEs using TTI bundling.
  • TTI bundling support may not be supported for all UEs (it is UE capability); TTI bundling may be configured for FDD and for TDD only for configurations 0, 1 , and 6.
  • PDCCH Physical Downlink Control Channel
  • NR-LTE co-existence mechanisms [RAN1 , RAN 2, RAN4]: Support co-existence of LTE UL and NR UL within the bandwidth of an LTE component carrier and co-existence of LTE DL and NR DL within the bandwidth of an LTE component carrier, and identify and specify at least one NR band/LTE-NR band combination for this operation.
  • TTI Transmit Time Interval
  • HARQ Hybrid Automatic Repeat Request
  • a method of operation of a node associated with a wireless system comprising a first radio access network of a first RAT and a second radio access network of a second RAT that is different than the first RAT comprises configuring TTI
  • the method further comprises using TTI bundling/aggregation and/or asynchronous HARQ in the first radio access network in accordance with a result of configuring TTI bundling/aggregation and/or asynchronous HARQ in the first radio access network.
  • configuring TTI bundling/aggregation and/or asynchronous HARQ on the first radio access network of the first RAT comprises configuring uplink TTI bundling/aggregation in the first radio access network of the first RAT adaptively based on a subset of time and/or frequency resources allocated for downlink transmissions for the second RAT such that downlink transmissions of the first RAT for a given channel are avoided in resources which are comprised in the subset of time and/or frequency resources allocated for downlink transmissions for the second RAT.
  • configuring TTI bundling/aggregation and/or asynchronous HARQ on the first radio access network of the first RAT comprises configuring uplink TTI bundling/aggregation in the first radio access network of the first RAT such that conflict with downlink resources in the second radio access network of the second RAT is avoided when sharing downlink resources on the same carrier, wherein uplink transmissions in the first radio access network of the first RAT and downlink transmissions in the first radio access network of the first RAT are related in time.
  • the first RAT is Long Term Evolution (LTE) and the second RAT is New Radio (NR), and configuring uplink TTI
  • the given channel is a Physical HARQ Indicator Channel (PHICH) with uplink HARQ feedback.
  • PHICH Physical HARQ Indicator Channel
  • the first RAT is NR and the second RAT is LTE
  • configuring uplink TTI bundling/aggregation in the first radio access network of the first RAT such that conflict with downlink resources in the second radio access network of the second RAT is avoided when sharing downlink resources on the same carrier comprises configuring uplink TTI bundling/aggregation in the first radio access network of the first RAT adaptively to a subset of time and/or frequency resources allocated for LTE downlink transmissions in the second radio access network such that NR downlink transmissions of a given channel are avoided in resources which are comprised in the subset.
  • the given channel is a data channel, a control channel, or a channel with uplink HARQ feedback.
  • configuring TTI bundling/aggregation and/or asynchronous HARQ on the first radio access network of the first RAT comprises configuring TTI bundling/aggregation and/or asynchronous HARQ on the first radio access network of the first RAT such that at least one parameter of TTI bundling/aggregation and/or HARQ configuration is based on at least one parameter characterizing resources associated with the second RAT.
  • the at least one parameter of TTI bundling/aggregation and/or HARQ configuration comprises bundle size, bundle transmission time and resources, transmission power, and/or number of HARQ retransmissions.
  • the at least one parameter characterizing resources associated with the second RAT comprises time, pattern, numerology, and/or duplex mode for the resources associated with the second RAT.
  • configuring TTI bundling/aggregation and/or asynchronous HARQ on the first radio access network of the first RAT comprises adapting an uplink TTI size for the first radio access network of the first RAT such that downlink transmission for the first RAT are avoided in resources associated with the second RAT.
  • configuring TTI bundling/aggregation and/or asynchronous HARQ on the first radio access network of the first RAT comprises configuring a first transmission and/or transmitting a scheduling grant in the first radio access network of the first RAT adaptively to a subset of time and/or frequency resources allocated for downlink transmissions in the second radio access network.
  • configuring TTI bundling/aggregation and/or asynchronous HARQ on the first radio access network of the first RAT comprises configuring use of synchronous or asynchronous uplink HARQ in the first radio access network of the first RAT based on one or more triggering conditions related to the second RAT.
  • configuring TTI bundling/aggregation and/or asynchronous HARQ on the first radio access network of the first RAT comprises configuring asynchronous uplink HARQ in the first radio access network of the first RAT such that a conflict between the first RAT and downlink resources in the second radio access network of the second RAT is avoided.
  • configuring asynchronous uplink HARQ in the first radio access network of the first RAT such that a conflict between the first RAT and downlink resources in the second radio access network of the second RAT are avoided comprises selecting asynchronous uplink HARQ for use in the first radio access network of the first RAT if the first radio access network and the second radio access network share the same downlink carrier frequency.
  • configuring asynchronous uplink HARQ in the first radio access network of the first RAT such that a conflict between the first RAT and downlink resources in the second radio access network of the second RAT are avoided comprises scheduling asynchronous uplink HARQ feedback and/or a transmission that triggers asynchronous uplink HARQ feedback such that the asynchronous uplink HARQ feedback is transmitted in the resources that are determined to be available for the first radio access network of the first RAT.
  • the first RAT is LTE and the second RAT is NR.
  • the first RAT is NR and the second RAT is LTE.
  • configuring TTI bundling/aggregation and/or asynchronous HARQ on the first radio access network of the first RAT comprises configuring downlink TTI bundling/aggregation in the first radio access network of the first RAT adaptively based on a subset of time and/or frequency resources allocated for uplink transmissions in the second RAT such that uplink
  • transmissions in the first radio access network of the first RAT for a given channel are avoided in resources which are comprised in the subset of time and/or frequency resources allocated for uplink transmissions in the second RAT.
  • configuring TTI bundling/aggregation and/or asynchronous HARQ on the first radio access network of the first RAT comprises configuring downlink TTI bundling/aggregation in the first radio access network of the first RAT such that conflict with uplink resources in the second radio access network of the second RAT is avoided when sharing uplink resources on the same carrier.
  • the first RAT is LTE and the second RAT is N R
  • configuring downlink TTI bundling/aggregation in the first radio access network of the first RAT such that conflict with uplink resources in the second radio access network of the second RAT is avoided when sharing uplink resources on the same carrier comprises configuring downlink TTI
  • bundling/aggregation in the first radio access network of the first RAT adaptively to a subset of time and/or frequency resources allocated for NR uplink
  • the first RAT is NR and the second RAT is LTE
  • configuring downlink TTI bundling/aggregation in the first radio access network of the first RAT such that conflict with uplink resources in the second radio access network of the second RAT is avoided when sharing uplink resources on the same carrier comprises configuring downlink TTI
  • bundling/aggregation in the first radio access network of the first RAT adaptively to a subset of time and/or frequency resources allocated for LTE uplink transmissions in the second radio access network such that NR uplink transmissions of a given channel are avoided in resources which are comprised in the subset.
  • configuring TTI bundling/aggregation and/or asynchronous HARQ on the first radio access network of the first RAT comprises configuring use of synchronous or asynchronous downlink HARQ in the first radio access network of the first RAT based on one or more triggering conditions related to the second RAT.
  • configuring TTI bundling/aggregation and/or asynchronous HARQ on the first radio access network of the first RAT comprises configuring asynchronous downlink HARQ in the first radio access network of the first RAT such that a conflict between the first RAT and uplink resources in the second radio access network of the second RAT are avoided.
  • configuring asynchronous downlink HARQ in the first radio access network of the first RAT such that a conflict between the first RAT and uplink resources in the second radio access network of the second RAT are avoided comprises selecting asynchronous downlink HARQ for use in the first radio access network of the first RAT if the first radio access network and the second radio access network share the same uplink carrier frequency.
  • configuring asynchronous downlink HARQ in the first radio access network of the first RAT such that a conflict between the first RAT and uplink resources in the second radio access network of the second RAT are avoided comprises scheduling asynchronous downlink HARQ feedback and/or a transmission that triggers asynchronous HARQ feedback such that the asynchronous downlink HARQ feedback is transmitted in the resources that are determined to be available for the first radio access network of the first RAT.
  • the first RAT is LTE and the second RAT is NR.
  • the first RAT is NR and the second RAT is LTE.
  • the node is a network node. In some embodiments, the node is a wireless device.
  • Embodiments of a node associated with a wireless system comprising a first radio access network of a first RAT and a second radio access network of a second RAT that is different than the first RAT are also disclosed.
  • a node associated with a wireless system comprising a first radio access network of a first RAT and a second radio access network of a second RAT that is different than the first RAT is adapted to configure TTI
  • a node associated with a wireless system comprising a first radio access network of a first RAT and a second radio access network of a second RAT that is different than the first RAT comprises at least one processor and memory comprising instructions executable by the at least one processor whereby the node is operable to configure TTI
  • a node associated with a wireless system comprising a first radio access network of a first RAT and a second radio access network of a second RAT that is different than the first RAT comprises a configuring module operable to configure TTI bundling/aggregation and/or asynchronous HARQ in the first radio access network of the first RAT such that a conflict between the first RAT and the second RAT is avoided when sharing uplink resources and/or downlink resources on the same carrier.
  • Figure 1 illustrates an example architecture for a Third Generation Partnership Project (3GPP) New Radio (NR) network
  • Figure 2 illustrates example deployments of a NR network
  • Figure 3 illustrates one example of hybrid beamforming
  • Figures 4A and 4B illustrates examples of transmit beam sweeping
  • Figure 5 illustrates examples of candidate carrier spacings
  • FIGS 6A through 6C illustrate Long Term Evolution (LTE) Hybrid Automatic Repeat Request (HARQ);
  • LTE Long Term Evolution
  • HARQ Hybrid Automatic Repeat Request
  • Figure 7 is a flow chart that illustrates the operation of a node according to some embodiments of the present disclosure.
  • Figure 8 illustrates one example of a wireless system (e.g., a cellular communications network such as, e.g., a 3GPP Fifth Generation (5G) or N R network), in which embodiments of the present disclosure may be implemented;
  • a wireless system e.g., a cellular communications network such as, e.g., a 3GPP Fifth Generation (5G) or N R network
  • 5G Fifth Generation
  • N R Network Radio Service
  • Figures 9 and 1 0 are example embodiments of a wireless device.
  • Figures 1 1 through 13 are example embodiments of a network node.
  • a non-limiting term "User Equipment” or "UE” is used.
  • the UE herein can be any type of wireless device capable of communicating with network node or another UE over radio signals.
  • the UE may also be a radio communication device, a target device, a Device-to-Device (D2D) UE, a machine type UE or a UE capable of Machine-to-Machine (M2M) communication, a sensor equipped with a UE, an iPad, a tablet, mobile terminals, a smart phone, Laptop Embedded Equipment (LEE), Laptop
  • D2D Device-to-Device
  • M2M Machine-to-Machine
  • LME Mounted Equipment
  • USB Universal Serial Bus
  • CPE Customer Premises Equipment
  • network node can be any kind of network node which may comprise a radio network node such as a base station, a radio base station, a base transceiver station, a base station controller, a network controller, a New Radio (NR) base station (gNB), a NR base station, an enhanced or evolved Node B (eNB), a Node B, a Multi-Cell/Multicast Coordination Entity (MCE), a relay node, an access point, a radio access point, a Remote Radio Unit (RRU) , a Remote Radio Head (RRH), a multi-standard base station (aka a Multi-Standard Radio (MSR) base station), a core network node (e.g., a Mobility Management Entity (MME), a Self- Organizing Network (SON) node, a coordinating node, a positioning node, a Minimization of Drive Tests (MDT) node, etc.), or
  • MME Mobility Management Entity
  • SON Self- Organizing
  • LTE Long Term Evolution
  • LTE Long Term Evolution
  • radio node used herein may be used to denote a UE or a radio network node.
  • CA Carrier Aggregation
  • the embodiments are applicable to single carrier as well as to multicarrier or Carrier Aggregation (CA) operation of the UE in which the UE is able to receive and/or transmit data to more than one serving cells.
  • CA is also called (e.g. , interchangeably called) "multi-carrier system,” “multi-cell operation,” “multi-carrier operation,” and “multi-carrier” transm ission and/or reception.
  • CCs Component Carriers
  • PCell Primary Cell
  • PSC Primary Serving Cell
  • SCell Secondary Cell
  • SSC Secondary Serving Cell
  • the term "signaling" used herein may comprise any of: high-layer signaling (e.g., via Radio Resource Control (RRC) or the like), lower-layer signaling (e.g., via a physical control channel or a broadcast channel), or a combination thereof.
  • RRC Radio Resource Control
  • the signaling may be implicit or explicit.
  • the signaling may further be unicast, multicast, or broadcast.
  • the signaling may also be directly to another node or via a third node.
  • time resource used herein may correspond to any type of physical resource or radio resource expressed in terms of length of time.
  • time resources are: symbol, time slot, subframe, radio frame, Transmit Time Interval (TTI), interleaving time, etc.
  • TTI Transmit Time Interval
  • Radio measurement used herein may refer to any measurement performed on radio signals.
  • Radio measurements can be absolute or relative.
  • Radio measurements can be, e.g., intra-frequency, inter-frequency, CA, etc.
  • Radio measurements can be unidirectional (e.g., downlink or uplink) or bidirectional (e.g., Round Trip Time (RTT), receive-transmit (Rx-Tx), etc.).
  • RTT Round Trip Time
  • Rx-Tx receive-transmit
  • Some examples of radio measurements include timing measurements (e.g., Time of Arrival (TOA), timing advance, RTT, Reference Signal Time Difference (RSTD), System Frame Number and Subframe Timing Difference (SSTD), Rx-Tx, propagation delay, etc.), angle measurements (e.g., angle of arrival), power-based
  • measurements e.g., received signal power, Reference Signal Received Power (RSRP), received signal quality, Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR), interference power, total interference plus noise, Received Signal Strength Indicator (RSSI), noise power, Channel Quality Indication (CQI), Channel State Information (CSI), Precoding Matrix Indicator (PMI), etc.), cell detection or cell identification, beam detection or beam identification, Radio Link Monitoring (RLM), system information reading, etc.
  • RSRP Reference Signal Received Power
  • RSSQ Signal Received Quality
  • SINR Signal to Interference plus Noise Ratio
  • SNR Signal to Noise Ratio
  • interference power total interference plus noise
  • CQI Received Signal Strength Indicator
  • CQI Channel Quality Indication
  • CSI Channel State Information
  • PMI Precoding Matrix Indicator
  • beamformed measurement which is also known as radio beamformed measurement, used herein refers to any of the above radio measurements performed by a radio node on at least radio signals, which are transmitted by another radio node using at least one beam.
  • the transmitted beam may be created by at least two transmit antennas or antenna elements.
  • the beamformed measurement is also interchangeably called a 'measurement with beamforming,' a measurement on one or more beams, a beam
  • beamformed measurement may further comprise performing the measurement using beamformed reception, i.e., using at least one reception beam.
  • the beamformed measurement performed without measurement on the reception beam is denoted by Nb1 .
  • the beamformed measurement performed with the reception beam is denoted by Nb2.
  • a beamformed measurement is denoted by a generic term, 'Nb,' and it can be Nb1 or Nb2.
  • non-beamformed measurement which is also known as radio non-beamformed measurement, used herein refers to any of the above radio measurements performed by a radio node on at least radio signals, which are transmitted by another radio node without any beam.
  • the radio signal may be transmitted from the other radio node by using one or more transmit antennas.
  • the radio signals are transmitted in the entire cell or at least in the part of the signal, e.g., in the sector.
  • the non-beamformed measurement is also interchangeably called a 'measurement without beamforming,' a measurement on omnidirectional signals or signals transmitted from omnidirectional or sectorized but not beamforming antennas, an omnidirectional measurement, a sector measurement, etc.
  • non-beamformed measurement may further comprise performing the measurement using non-beamformed reception, i.e., without using any reception beam.
  • the non-beamformed measurement performed without reception beam is denoted by Nn1 .
  • the term non- beamformed measurement may further comprise performing the measurement using beamformed reception, i.e., using at least one reception beam.
  • the non- beamformed measurement performed with the reception beam is denoted by Nn2.
  • a non-beamformed measurement with or without reception beam is denoted by a generic notation, 'Nn,' and it can be Nn1 or Nn2.
  • measurement performance used herein may refer to any criteria or metric which characterizes the performance of the measurement performed by a radio node.
  • the term measurement performance is also called measurement requirement, measurement performance requirements, etc.
  • the radio node has to meet one or more measurement performance criteria related to the performed measurement. Examples of measurement performance criteria are measurement time, number of cells to be measured with the measurement time, measurement reporting delay, measurement accuracy, measurement accuracy with regard to a reference value (e.g., ideal measurement result), etc. Examples of measurement time are measurement period, cell identification period, evaluation period, etc.
  • dynamic (e.g., in time) antenna configuration may comprise:
  • the dynamic antenna configuration relates to beamforming and may
  • the dynamic antenna configuration may be at the first radio node side or at the second and/or third radio node sides.
  • the dynamic configuration may apply to receive antennas and/or transmit antennas.
  • number of subcarriers per Resource Block (RB) may refer, e.g. , to any one or more of: subcarrier spacing, number of subcarriers per Resource Block (RB), Cyclic
  • Prefix (CP) length number of RBs within the bandwidth, subframe length, etc.
  • the numerology may be configured statically or change dynamically for transmissions from the same Transmission Point (TP) or cell and may or may not be the same for different cells and/or carrier frequencies.
  • TP Transmission Point
  • uplink TTI bundling/aggregation is configured and used in RATI adaptively to (i.e., configured and used in RATI adaptively based on) a subset of time and/or frequency resources allocated for RAT2 downlink transmissions, so that RATI downlink transmissions of a given channel (e.g., Physical Hybrid Automatic Repeat Request (HARQ) Indicator Channel (PHICH) or more specifically PHICH with uplink HARQ feedback or similar) are avoided in resources which are comprised in the subset.
  • HARQ Physical Hybrid Automatic Repeat Request
  • PHICH Physical Hybrid Automatic Repeat Request
  • PHICH Physical Hybrid Automatic Repeat Request
  • the selection or use of synchronous or asynchronous uplink HARQ in RATI is based on one or more triggering conditions related to RAT2, e.g. asynchronous uplink HARQ is used when RATI and RAT2 are sharing a downlink carrier frequency otherwise synchronous uplink HARQ may be used, or when predefined time instances for uplink HARQ feedback do not match (e.g., not a subset of) the downlink resources available for RATI (i.e., fall into the subset of time and/or frequency resources allocated for RAT2 downlink), etc.
  • asynchronous uplink HARQ is used when RATI and RAT2 are sharing a downlink carrier frequency otherwise synchronous uplink HARQ may be used, or when predefined time instances for uplink HARQ feedback do not match (e.g., not a subset of) the downlink resources available for RATI (i.e., fall into the subset of time and/or frequency resources allocated for RAT2 downlink), etc.
  • downlink TTI bundling/aggregation is configured and used in RATI adaptively to (i.e., configured and used in RATI adaptively based on) a subset of time and/or frequency resources allocated for RAT2 uplink transmissions, so that RATI uplink transmissions of a given channel are avoided in resources which are comprised in the subset.
  • the selection or use of synchronous or asynchronous downlink HARQ in RATI is based on one or more triggering conditions related to RAT2, e.g. asynchronous uplink HARQ is used when RATI and RAT2 are sharing an uplink carrier frequency otherwise synchronous downlink HARQ may be used, or when predefined time instances for downlink HARQ feedback do not match (e.g., not a subset of) the uplink resources available for RATI (i.e., fall into the subset of time and/or frequency resources allocated for RAT2 uplink), etc.
  • asynchronous uplink HARQ is used when RATI and RAT2 are sharing an uplink carrier frequency otherwise synchronous downlink HARQ may be used, or when predefined time instances for downlink HARQ feedback do not match (e.g., not a subset of) the uplink resources available for RATI (i.e., fall into the subset of time and/or frequency resources allocated for RAT2 uplink), etc.
  • RATI and RAT2 share resources on the same carrier for at least one of downlink and uplink.
  • RATI may be LTE (or enhanced LTE)
  • RAT2 may be NR
  • RATI may be NR
  • RAT2 may be LTE (or enhanced LTE).
  • RATI and RAT2 may be operated by the same network node. In another example, RATI and RAT2 may be operated by different network nodes.
  • a RATI network node and a RAT2 network node may be or may intend to be in dual carrier operation (i.e., both serving the UE, one as master eNB and another one as a secondary eNB, which physically may or may not be in the same node).
  • RAT2 downlink resources may comprise a subset of the time resources configurable as Multicast- Broadcast Single Frequency Network (MBSFN) subframes, e.g., RAT2 downlink may not appear in subframe #0 or #5.
  • MMSFN Multicast- Broadcast Single Frequency Network
  • the HARQ operation of RATI is adapted to or configured based on how the downlink and/or uplink resources are shared on the same carrier with RAT2, where one of RATI and RAT2 is LTE and another one is NR.
  • the HARQ configuration determined based on the described
  • eNB or gNB may further be indicated to another node (e.g., base station (eNB or gNB) to UE, UE to base station (eNB or gNB), BS1 (eNB or gNB) to BS2 (eNB or gNB), network node 1 to network node 2).
  • another node e.g., base station (eNB or gNB) to UE, UE to base station (eNB or gNB), BS1 (eNB or gNB) to BS2 (eNB or gNB), network node 1 to network node 2).
  • eNB and gNB may also be coordination or message exchange or information delivery between eNB and gNB or UE and base station (eNB or gNB) regarding the shared downlink and/or uplink resource allocation and/or the allocation may be determined based on common rules known to both nodes.
  • a UE operating to any embodiments described herein may further signal its capability to another node such as a network node.
  • the UE and/or network node may also need to know the resources of RAT2.
  • the network node may schedule resources in RAT2 and thus jointly control RATI HARQ operation and RAT2 resources.
  • the network node may get the RAT2 resource information from a RAT2 network node.
  • the UE may determine the RAT2 resources based on a predefined rule or standard and/or message from the RATI and/or RAT2 network node.
  • the RATI network node may also use predefined rules to determine RAT2 resources.
  • the UE or RATI network node may also determine RAT2 resources based on measurements and searching for a known signal associated with RAT2 or for a certain power profile.
  • Examples of HARQ operation include: scheduling/controlling resources for/performing a transmission which is in turn triggering Acknowledgment/ Negative Acknowledgment (ACK/NACK) transmission, receiving ACK/NACK, scheduling/controlling resources for/performing/bundling ACK/NACK
  • the described embodiments provide advantages such as, e.g., the possibility to avoid conflicting resource allocation and hereby enable the system operation when LTE and NR share a carrier frequency.
  • FIG. 7 is a flow chart that illustrates the operation of a node according to some embodiments of the present disclosure.
  • the node may be a network node (e.g., a radio access node or a core network node) or a wireless device (e.g., a UE), depending on the particular embodiment.
  • the node is associated with a wireless system, which may be referred to herein as a cellular network, that includes two (or more) Radio Access Technologies (RATs) (e.g., LTE and NR).
  • RATs Radio Access Technologies
  • the wireless system includes a first radio access network of a first RAT and a second radio access network of a second RAT that is different than the first RAT.
  • one of the two RATs is LTE (e.g., LTE-Advanced, LTE-Pro, or some enhanced version of LTE), and the other RAT is NR.
  • the two RATs share at least some downlink resources on the same downlink carrier and/or share at least some uplink resources on the same uplink carrier.
  • the node configures TTI bundling (or TTI aggregation) and/or asynchronous HARQ in the first radio access network of the first RAT such that a conflict (i.e., overlap in time on the same resources on the same carrier) between the first RAT and the second RAT is avoided when sharing uplink resources and/or downlink resources on the same carrier (step 100).
  • the node uses TTI bundling (or TTI aggregation) and/or asynchronous HARQ in the first radio access network in accordance with a result of step 100 (step 102).
  • TTI bundling or TTI aggregation is denoted herein as TTI bundling/aggregation.
  • uplink TTI bundling/aggregation is used in the first RAT (RATI ) to avoid conflict with downlink resources of the second RAT (RAT2) when RATI and RAT2 are sharing downlink resources on the same carrier frequency, and where the uplink transmissions of RATI and downlink transmissions of RATI are related in time.
  • the node configures uplink TTI bundling/aggregation in RATI to avoid conflict with downlink resources of RAT2 when RATI and RAT2 are sharing downlink resources on the same carrier frequency, where uplink transmissions of RATI and downlink transmission of RATI are related in time.
  • the node configures uplink TTI bundling/aggregation in RATI to avoid conflict (i.e., overlap in time) between downlink resources used for HARQ feedback associated with the uplink TTI bundling/aggregation for RATI and downlink resources (on the same carrier) allocated for downlink transmissions for RAT2.
  • this embodiment may be used when RATI has downlink in a first subset of resources on carrier frequency f 1 and RAT2 has downlink in a second subset of resources on f1 , where the non-overlapping first and the second subsets of resources can be configured statically, semi-statically, or dynamically.
  • the first subset and the second subset of resources may be used by a first set of UEs and a second set of UEs, wherein the first and the second sets of UEs may or may not overlap.
  • the node may need to determine the downlink resources used by RAT2.
  • the determining of RAT2 downlink resources may be based, e.g., on a message from another node, measurements, standard, and/or predefined rule.
  • a node capable of receiving/understanding signals of RAT2 may also determine whether resources are used by RAT2 transmissions by performing measurements in those resources or searching for known signals associated with RAT2 or determining a certain power profile.
  • At least one parameter of the UE TTI bundling and/or HARQ configuration may be based on at least one parameter (e.g., time, pattern, numerology, duplex mode, etc.) characterizing the resources associated with RAT2.
  • the node may make this configuration based on at least one parameter (e.g., time, pattern, numerology, duplex mode, etc.) characterizing the resources associated with RAT2. For example, the maximum number of HARQ
  • the RATI uplink bundle transmission time or the grant (sent in RATI downlink) for this RATI uplink transmission may be selected or delayed so that the next downlink transmission is avoided to appear in resources allocated to RAT2.
  • the bundle size may be optimized (e.g., depend on), e.g., for each uplink-downlink subframe
  • the bundle size is four and TTI bundling cannot be used for some uplink-downlink subframe configuration.
  • the uplink TTI size may also be adapted to avoid the downlink transmissions of RATI in the resources associated with RAT2.
  • RATI is in LTE and RAT2 is NR
  • LTE uplink TTI bundling is configured and used adaptively to a subset of time and/or frequency resources allocated for N R downlink transmissions, so that LTE downlink transmissions of a given channel (e.g., PH ICH or more specifically PHICH with uplink HARQ feedback) are avoided in resources which are comprised in the subset.
  • the N R downlink resources may comprise any subframe except subframes #0 and #5.
  • the NR downlink resources may comprise any subframe which may be configured as a LTE MBSFN subframe.
  • RATI is NR and RAT 2 is LTE
  • NR uplink TTI bundling is configured and used adaptively to a subset of time and/or frequency resources allocated for LTE downlink transmissions, so that NR downlink transmissions of a given channel (e.g., control channel or data channel or more specifically channel with uplink HARQ feedback) are avoided in resources which are comprised in the subset.
  • a given channel e.g., control channel or data channel or more specifically channel with uplink HARQ feedback
  • the TTI bundling may concern one or more UEs.
  • the size of the TTI bundle may be four TTIs.
  • controlling the uplink TTI bundling may be performed by a network node and indicated to the UE. In another example, controlling the uplink TTI bundling may be performed by a UE, e.g., based on a predefined rule and/or a message received from another node (e.g., a network node).
  • the adaptation/configuration may be in the UE (e.g., based on a predefined rule or a control message from the network node) and/or network node.
  • the network node (operating RATI ) may also send a message or coordinate with another network node (operating RAT2).
  • the network node may need to configure/adapt the ACK/NACK transmission based on the above, e.g., for the uplink TTI bundle.
  • the UE may need to configure/adapt the reception of ACK/NACK transmitted by the network node.
  • the UE may need to configure/adapt the transmission (to be
  • the network node may need to adapt/configure the reception of the uplink transmission (to be ACK/NACK-ed) based on the above.
  • the downlink transmission of RATI and/or RAT2 may be based, e.g., on Frequency Division Duplexing (FDD), Time Division Duplexing (TDD), Half Duplex FDD (HD-FDD), or flexible duplex mode.
  • FDD Frequency Division Duplexing
  • TDD Time Division Duplexing
  • HD-FDD Half Duplex FDD
  • RATI and RAT2 downlink transmissions may or may not have the same duplex.
  • a node controlling uplink TTI bundling may coordinate with the node controlling NR downlink resources, e.g., one or more messages may be sent in one or both directions.
  • the message(s) may comprise one or more parameters related to how RATI uplink TTI bundling is configured based on (to avoid the conflict with) the subset of RAT2 downlink resources.
  • the node controlling RATI resources and the node controlling RAT2 resources may be different physical nodes or may be logical nodes (comprised in the same or different physical nodes).
  • the messages between the two nodes may be sent via cross-layer communication, via a direct radio or non-radio interface, or even via a third node.
  • the node may further configure the first transmission and/or transmit the scheduling grant adaptively to the set of RAT2 resources, e.g., to avoid sending RATI uplink scheduling grant in subframes when the next RATI PHICH ACK/NACK (in 8 milliseconds (ms)) cannot be received due to a conflict with RAT2 downlink resources.
  • the scheduling grant adaptively to the set of RAT2 resources, e.g., to avoid sending RATI uplink scheduling grant in subframes when the next RATI PHICH ACK/NACK (in 8 milliseconds (ms)) cannot be received due to a conflict with RAT2 downlink resources.
  • TTI bundling can be used for data transmissions but not for Msg3 for Random Access (RA). It is thus an embodiment that TTI bundling may be used also for RA Msg3 when RATI and RAT2 are sharing downlink resources on the same carrier frequency. Selecting Asynchronous HARQ in RATI to Avoid the Conflict with RAT2
  • asynchronous HARQ may be configured in RATI to avoid the conflict with RAT2 downlink resources.
  • the node configures asynchronous HARQ in RATI to avoid conflict with RAT2 downlink resources, where RATI and RAT2 are sharing the same downlink carrier frequency.
  • the selection or use of synchronous or asynchronous uplink HARQ in RATI may further be based on one or more triggering conditions related to RAT2, e.g., asynchronous uplink HARQ is used when RATI and RAT2 are sharing a downlink carrier frequency, otherwise synchronous uplink HARQ may be used, or when predefined time instances for uplink HARQ feedback do not match (e.g., not a subset of) the downlink resources available for RATI (i.e., fall into the subset of time and/or frequency resources allocated for RAT2 downlink), etc.
  • the selection may be based on a predefined rule or may be configurable, e.g., allowed or not allowed.
  • asynchronous HARQ operation may further comprise scheduling the feedback and/or the transmission which triggers the feedback so that the feedback can be transmitted in the resources which are determined to be available for RATI .
  • RATI and RAT2 are LTE and NR, respectively. In another example, RATI and RAT2 are NR and LTE, respectively.
  • the selection between synchronous and asynchronous uplink HARQ may be done in the UE (e.g., based on a predefined rule and/or message from another node) and/or controlled by a network node.
  • the adaptation/configuration may be in the UE (e.g., based on a predefined rule or a control message from the network node) and/or network node.
  • the network node (operating RATI ) may also send a message or coordinate with another network node (operating RAT2).
  • the network node may need to configure/adapt the ACK/NACK transmission based on the above, e.g., for the uplink TTI bundle.
  • the UE may need to configure/adapt the reception of the ACK/NACK transmitted by the network node.
  • the UE may need to configure/adapt the transmission (to be
  • the network node may need to adapt/configure the reception of the uplink transmission (to be ACK/NACK-ed) based on the above.
  • the selecting node needs to determine the downlink resources which are or may be used by RAT2. For example, the determining may be based on a message from another node or may be based on a standard or a predefined rule. A message from another node may comprise, e.g., system information, assistance data, etc.
  • the selecting node capable of receiving/understanding signals of RAT2 may also determine whether resources are used by RAT2 transmissions by performing measurements in those resources or searching for known signals associated with RAT2 or determining a certain power profile.
  • the downlink transmission of RATI and/or RAT2 may be based, e.g., on FDD, TDD, HD-FDD, or flexible duplex mode.
  • RATI and RAT2 downlink transmissions may or may not have the same duplex.
  • a UE capable of adaptive switching between HARQ
  • synchronous/asynchronous based on the determined RAT2 downlink resources, may also indicate such capability to the network node.
  • downlink TTI bundling is configured and used in RATI adaptively to a subset of time and/or frequency resources allocated for RAT2 uplink transmissions, so that RATI uplink transmissions of a given channel are avoided in resources which are comprised in the RAT2 uplink subset.
  • the node configures downlink TTI bundling in RATI in an adaptive manner based on a subset of time and/or frequency resources allocated for RAT2 uplink transmissions such that RATI uplink transmissions of a given channel are avoided in resources which are comprised in the subset of time and/or frequency resources allocated for RAT2 uplink transmissions.
  • RATI may be LTE, while RAT2 may be NR.
  • RATI may be NR, while RAT2 may be LTE.
  • the UE may need to adapt/configure the ACK/NACK transmission based on the above, e.g., for the downlink TTI bundle.
  • the network node may need to adapt/configure the reception of ACK/NACK transmitted by the UE.
  • the network node may need to adapt/configure the transmission based on the above.
  • the UE may need to adapt/configure the reception of the downlink transmission based on the above.
  • the adaptation/configuration may be in the UE (e.g., based on a predefined rule or a control message from the network node) and/or network node.
  • the network node (operating RATI ) may also send a message or coordinate with another network node (operating RAT2).
  • asynchronous HARQ may be configured in RATI to avoid the conflict with RAT2 uplink resources.
  • the node configures asynchronous HARQ in RATI to avoid conflict with RAT2 uplink resources, where RATI and RAT2 are sharing the same uplink carrier frequency.
  • asynchronous downlink HARQ in RATI may further be based on one or more triggering condition related to RAT2, e.g., asynchronous downlink HARQ is used when RATI and RAT2 are sharing an uplink carrier frequency otherwise synchronous downlink HARQ may be used, or when predefined time instances for downlink HARQ feedback do not match (e.g., not a subset of) the uplink resources available for RATI (i.e., fall into the subset of time and/or frequency resources allocated for RAT2 uplink), etc. [0126] In a further embodiment, the selection of synchronous or
  • asynchronous HARQ operation may further comprise scheduling the feedback and/or the transmission which triggers the feedback so that the feedback can be transmitted in the resources which are determined to be available for RATI .
  • RATI may be LTE, while RAT2 may be NR.
  • RATI may be NR, while RAT2 may be LTE.
  • the UE may need to adapt/configure the ACK/NACK transmission based on the above.
  • the network node may need to adapt/configure the reception of ACK/NACK transmitted by the UE.
  • the network node may need to adapt/configure the transmission (to be ACK/NACK-ed) based on the above.
  • the UE may need to adapt/configure the reception of the downlink transmission (to be ACK/NACK-ed) based on the above.
  • the adaptation/configuration may be in the UE (e.g., based on a predefined rule or a control message from the network node) and/or network node.
  • the network node (operating RATI ) may also send a message or coordinate with another network node (operating RAT2).
  • FIG 8 illustrates one example of a wireless system 10 (e.g., a cellular communications network), in which embodiments of the present disclosure may be implemented.
  • a number of wireless devices 12 e.g., UEs
  • wireless access nodes 14 e.g., eNBs and/or gNBs
  • the radio access nodes 14 are connected to a core network 1 8.
  • the wireless system 1 0 includes a number of radio access nodes 14 forming a first radio access network of a first RAT and a number of radio access nodes 14 forming a second radio access network of a second RAT.
  • a particular radio access node 14 may serve cells in both of the RATs.
  • one of the two RATs may be LTE (e.g., LTE, LTE-A, LTE-Pro, or some enhanced version of LTE) and the other of the two RATs may be Fifth Generation (5G) NR.
  • the two radio access networks (or in other words the two RATs) share downlink resources on the same carrier and/or share uplink resources on the same carrier, but not necessarily for the same wireless device 1 2.
  • One or more of the nodes operate in accordance with the process described above with respect to Figure 7.
  • FIG. 9 is a schematic block diagram of the wireless device 12 (e.g., UE) according to some embodiments of the present disclosure.
  • the wireless device 12 includes circuitry 20 comprising one or more processors 22 (e.g., Central Processing Units (CPUs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs), Digital Signal Processors (DSPs), and/or the like) and memory 24.
  • the wireless device 12 also includes one or more transceivers 26 each including one or more
  • the functionality of the wireless device 12 described above may be implemented in hardware (e.g., via hardware within the circuitry 20 and/or within the processor(s) 22) or be implemented in a combination of hardware and software (e.g., fully or partially implemented in software that is, e.g., stored in the memory 24 and executed by the processor(s) 22).
  • a computer program including instructions which, when executed by the at least one processor 22, causes the at least one processor 22 to carry out at least some of the functionality of the wireless device 12 according to any of the embodiments described herein is provided.
  • a carrier containing the aforementioned computer program product is provided.
  • the carrier is one of an electronic signal, an optical signal, a radio signal, or a computer readable storage medium (e.g., a non-transitory computer readable medium such as memory).
  • FIG. 10 is a schematic block diagram of the wireless device 12 (e.g., UE) according to some other embodiments of the present disclosure.
  • the wireless device 12 includes one or more modules 34, each of which is
  • the module(s) 34 provide the functionality of the wireless device 12 described herein.
  • the modules(s) 34 may include a configuring module operable to perform the function of step 100 of Figure 7 and a using module (optional) operable to perform the function of step 102 of Figure 7.
  • FIG. 1 is a schematic block diagram of a network node 36 (e.g., a radio access node 14 such as, for example, an eNB or gNB) or a core network node according to some embodiments of the present disclosure.
  • the network node 36 includes a control system 38 that includes circuitry comprising one or more processors 40 (e.g., CPUs, ASICs, DSPs, FPGAs, and/or the like) and memory 42.
  • the control system 38 also includes a network interface 44.
  • the network node 36 is a radio access node 14
  • the network node 36 also includes one or more radio units 46 that each include one or more transmitters 48 and one or more receivers 50 coupled to one or more antennas 52.
  • the functionality of the network node 36 described above may be fully or partially implemented in software that is, e.g., stored in the memory 42 and executed by the processor(s) 40.
  • FIG 12 is a schematic block diagram that illustrates a virtualized embodiment of the network node 36 (e.g., the radio access node 14 or a core network node) according to some embodiments of the present disclosure.
  • a "virtualized" network node 36 is a network node 36 in which at least a portion of the functionality of the network node 36 is implemented as a virtual component (e.g., via a virtual machine(s) executing on a physical processing node(s) in a network(s)).
  • the network node 36 optionally includes the control system 38, as described with respect to Figure 1 1 .
  • the network node 36 is the radio access node 14
  • the network node 36 also includes the one or more radio units 46, as described with respect to Figure 1 1 .
  • the control system 38 (if present) is connected to one or more processing nodes 54 coupled to or included as part of a network(s) 56 via the network interface 44.
  • the one or more radio units 46 (if present) are connected to the one or more processing nodes 54 via a network interface(s).
  • all of the functionality of the network node 36 described herein may be implemented in the processing nodes 54.
  • Each processing node 54 includes one or more
  • processors 58 e.g., CPUs, ASICs, DSPs, FPGAs, and/or the like
  • memory 60 e
  • functions 64 of the network node 36 described herein are implemented at the one or more processing nodes 54 or distributed across the control system 38 (if present) and the one or more processing nodes 54 in any desired manner.
  • some or all of the functions 64 of the network node 36 described herein are implemented as virtual components executed by one or more virtual machines implemented in a virtual environment(s) hosted by the processing node(s) 54.
  • additional signaling or communication between the processing node(s) 54 and the control system 38 (if present) or alternatively the radio unit(s) 46 (if present) is used in order to carry out at least some of the desired functions.
  • the control system 38 may not be included, in which case the radio unit(s) 46 (if present) communicates directly with the processing node(s) 54 via an appropriate network interface(s).
  • higher layer functionality e.g., layer 3 and up and possibly some of layer 2 of the protocol stack
  • the network node 36 may be implemented at the processing node(s) 54 as virtual components (i.e., implemented "in the cloud")
  • lower layer functionality e.g., layer 1 and possibly some of layer 2 of the protocol stack
  • a computer program including instructions which, when executed by the at least one processor 40, 58, causes the at least one processor 40, 58 to carry out the functionality of the network node 36 or a processing node 54 according to any of the embodiments described herein is provided.
  • a carrier containing the aforementioned computer program product is provided.
  • the carrier is one of an electronic signal, an optical signal, a radio signal, or a computer readable storage medium (e.g., a non-transitory computer readable medium such as the memory 60).
  • FIG. 13 is a schematic block diagram of the network node 36 (e.g., the radio access node 14 or a core network node) according to some other embodiments of the present disclosure.
  • the network node 36 includes one or more modules 66, each of which is implemented in software.
  • the module(s) 66 provide the functionality of the network node 36 described herein.
  • the module(s) 66 may comprise, for example, a configuring module operable to perform the function of step 100 of Figure 7 and a using module (optional) operable to perform the function of step 102 of Figure 7.
  • Embodiment 1 A method of operation of a node associated with a wireless system comprising a first radio access network of a first RAT and a second radio access network of a second RAT that is different than the first RAT, comprising: configuring (100) TTI bundling/aggregation and/or asynchronous HARQ in the first radio access network of the first RAT such that a conflict between the first RAT and the second RAT is avoided when sharing uplink resources and/or downlink resources on the same carrier.
  • Embodiment 2 The method of embodiment 1 further comprising using (102) TTI bundling/aggregation and/or asynchronous HARQ in the first radio access network in accordance with a result of configuring (100) TTI
  • Embodiment 3 The method of embodiment 1 or 2 wherein configuring (100) TTI bundling/aggregation and/or asynchronous HARQ on the first radio access network of the first RAT comprises configuring uplink TTI
  • Embodiment 4 The method of embodiment 3 wherein: the first RAT is LTE and the second RAT is NR; and configuring uplink TTI bundling/aggregation in the first radio access network of the first RAT such that conflict with downlink resources in the second radio access network of the second RAT is avoided when sharing downlink resources on the same carrier comprises: configuring uplink TTI bundling/aggregation in the first radio access network of the first RAT adaptively to a subset of time and/or frequency resources allocated for NR downlink transmissions in the second radio access network such that LTE downlink transmissions of a given channel are avoided in resources which are comprised in the subset.
  • Embodiment 5 The method of embodiment 4 wherein the given channel is PHICH with uplink HARQ feedback.
  • Embodiment 6 The method of embodiment 3 wherein : the first RAT is NR and the second RAT is LTE; and configuring uplink TTI bundling/aggregation in the first radio access network of the first RAT such that conflict with downlink resources in the second radio access network of the second RAT is avoided when sharing downlink resources on the same carrier comprises: configuring uplink TTI bundling/aggregation in the first radio access network of the first RAT adaptively to a subset of time and/or frequency resources allocated for LTE downlink transmissions in the second radio access network such that NR downlink transmissions of a given channel are avoided in resources which are comprised in the subset.
  • Embodiment 7 The method of embodiment 6 wherein the given channel is a data channel, a control channel, or a channel with uplink HARQ feedback.
  • Embodiment 8 The method of any one of embodiments 3 to 7 wherein configuring (100) TTI bundling/aggregation and/or asynchronous HARQ on the first radio access network of the first RAT comprises configuring (100) TTI bundling/aggregation and/or asynchronous HARQ on the first radio access network of the first RAT such that at least one parameter of TTI
  • bundling/aggregation and/or HARQ configuration is based on at least one parameter characterizing resources associated with the second RAT.
  • Embodiment 9 The method of any one of embodiments 3 to 7 further comprising adapting uplink TTI size such that downlink transmission for the first RAT are avoided in resources associated with the second RAT.
  • Embodiment 10 The method of embodiment 1 or 2 wherein configuring (100) TTI bundling/aggregation and/or asynchronous HARQ on the first radio access network of the first RAT comprises configuring (i.e., selecting) asynchronous HARQ in the first radio access network of the first RAT such that a conflict between the first RAT and downlink resources in the second radio access network of the second RAT are avoided.
  • Embodiment 1 1 The method of embodiment 1 0 wherein configuring (i.e., selecting) asynchronous HARQ in the first radio access network of the first RAT such that a conflict between the first RAT and downlink resources in the second radio access network of the second RAT are avoided comprises selecting asynchronous HARQ for use in the first radio access network of the first RAT if the first radio access network and the second radio access network share the same downlink carrier frequency.
  • Embodiment 12 The method of embodiment 1 0 or 1 1 wherein configuring (i.e., selecting) asynchronous HARQ in the first radio access network of the first RAT such that a conflict between the first RAT and downlink resources in the second radio access network of the second RAT are avoided comprises: scheduling asynchronous HARQ feedback and/or a transmission that triggers asynchronous HARQ feedback such that the asynchronous HARQ feedback is transmitted in the resources that are determined to be available for the first radio access network of the first RAT.
  • Embodiment 13 The method of any one of embodiments 10 to 12 wherein the first RAT is LTE and the second RAT is NR.
  • Embodiment 14 The method of any one of embodiments 10 to 12 wherein the first RAT is NR and the second RAT is LTE.
  • Embodiment 15 The method of embodiment 1 or 2 wherein configuring (100) TTI bundling/aggregation and/or asynchronous HARQ on the first radio access network of the first RAT comprises configuring downlink TTI bundling/aggregation in the first radio access network of the first RAT such that conflict with uplink resources in the second radio access network of the second RAT is avoided when sharing uplink resources on the same carrier.
  • Embodiment 16 The method of embodiment 1 5 wherein: the first RAT is LTE and the second RAT is NR; and configuring downlink TTI
  • Embodiment 17 The method of embodiment 1 5 wherein: the first RAT is NR and the second RAT is LTE; and configuring downlink TTI
  • Embodiment 18 The method of embodiment 1 or 2 wherein configuring (100) TTI bundling/aggregation and/or asynchronous HARQ on the first radio access network of the first RAT comprises configuring (i.e., selecting) asynchronous HARQ in the first radio access network of the first RAT such that a conflict between the first RAT and uplink resources in the second radio access network of the second RAT are avoided.
  • Embodiment 19 The method of embodiment 1 8 wherein configuring (i.e., selecting) asynchronous HARQ in the first radio access network of the first RAT such that a conflict between the first RAT and uplink resources in the second radio access network of the second RAT are avoided comprises:
  • Embodiment 20 The method of embodiment 1 8 or 19 wherein configuring (i.e., selecting) asynchronous HARQ in the first radio access network of the first RAT such that a conflict between the first RAT and uplink resources in the second radio access network of the second RAT are avoided comprises: scheduling asynchronous HARQ feedback and/or a transmission that triggers asynchronous HARQ feedback such that the asynchronous HARQ feedback is transmitted in the resources that are determined to be available for the first radio access network of the first RAT.
  • Embodiment 21 The method of any one of embodiments 18 to 20 wherein the first RAT is LTE and the second RAT is NR.
  • Embodiment 22 The method of any one of embodiments 18 to 20 wherein the first RAT is NR and the second RAT is LTE.
  • Embodiment 23 The method of any one of embodiments 1 to 22 wherein the node is a network node.
  • Embodiment 24 The method of any one of embodiments 1 to 22 wherein the node is a wireless device.
  • Embodiment 25 A node (12, 14, 36, 54) in a cellular communications network (10), the node (1 2, 14, 36, 54) adapted to perform the method of any one of embodiments 1 to 24.
  • Embodiment 26 A computer program comprising instructions which, when executed on at least one processor, cause the at least one processor to carry out the method according to any one of embodiments 1 to 24.
  • Embodiment 27 A carrier containing the computer program of embodiment 26, wherein the carrier is one of an electronic signal, an optical signal, a radio signal, or a computer readable storage medium.
  • Embodiment 28 A node (12, 14, 36, 54) in a cellular communications network (10), comprising: at least one processor (22, 40, 58); and memory (24, 42, 60) comprising instructions executable by the at least one processor (40, 58) whereby the network node (12, 14, 36, 54) is operable to perform the method of any one of embodiments 1 to 24.
  • Embodiment 29 A node (12, 14, 36, 54) in a cellular communications network (10), comprising: one or more modules (34, 66) operable to perform the method of any one of embodiments 1 to 24.
  • E-UTRAN Evolved Universal Terrestrial Radio Access Network

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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 systèmes et des procédés pour configurer et utiliser un groupement/une agrégation d'intervalles de temps de transmission (TTI) et/ou une demande de répétition automatique hybride (HARQ) asynchrone dans un premier réseau d'accès radio d'une première technologie d'accès radio (RAT) de manière à éviter des conflits avec un second réseau d'accès radio d'une seconde RAT en cas de partage des ressources de liaison montante et/ou de liaison descendante sur le même support. Dans certains modes de réalisation, un procédé de fonctionnement d'un nœud associé à un système sans fil, comprenant un premier réseau d'accès radio d'une première RAT et un second réseau d'accès radio d'une seconde RAT qui est différente de la première RAT, comprend la configuration d'un groupement/agrégation de TTI et/ou d'une HARQ asynchrone dans le premier réseau d'accès radio de la première RAT de sorte qu'un conflit entre la première RAT et la seconde RAT est évité en cas de partage de ressources de liaison montante et/ou de liaison descendante sur le même support.
PCT/SE2017/051349 2017-03-24 2017-12-22 Systèmes et procédés pour commander un renvoi de harq lorsque nr et lte coexistent sur le même support WO2018174766A1 (fr)

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