WO2018058420A1 - Traitement d'accusé de réception de scell pendant un intervalle de désyntonisation - Google Patents

Traitement d'accusé de réception de scell pendant un intervalle de désyntonisation Download PDF

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Publication number
WO2018058420A1
WO2018058420A1 PCT/CN2016/100766 CN2016100766W WO2018058420A1 WO 2018058420 A1 WO2018058420 A1 WO 2018058420A1 CN 2016100766 W CN2016100766 W CN 2016100766W WO 2018058420 A1 WO2018058420 A1 WO 2018058420A1
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WIPO (PCT)
Prior art keywords
scell
scheduling
rat
ack
threshold
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PCT/CN2016/100766
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English (en)
Inventor
Jiming Guo
Chintan Shirish SHAH
Harshawardhan VAZE
Lu Bai
Leena Zacharias
Kamalakar GANTI
Shahabuddin MOHAMMAD
Ling Xie
Cheol Hee Park
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Qualcomm Incorporated
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Priority to PCT/CN2016/100766 priority Critical patent/WO2018058420A1/fr
Publication of WO2018058420A1 publication Critical patent/WO2018058420A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • 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
    • H04L1/1825—Adaptation of specific ARQ protocol parameters according to transmission conditions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1861—Physical mapping 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
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H04L1/1819—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of additional or different redundancy
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H04W36/0088—Scheduling hand-off measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling

Definitions

  • the following relates generally to wireless communication and more specifically to secondary cell (SCell) acknowledgement handling during a tune-away gap.
  • SCell secondary cell
  • Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power) .
  • multiple-access systems include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, and orthogonal frequency division multiple access (OFDMA) systems, (e.g., a Long Term Evolution (LTE) system) .
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • LTE Long Term Evolution
  • a wireless multiple-access communications system may include a number of base stations, each simultaneously supporting communication for multiple communication devices, which may be otherwise known as user equipment (UE) .
  • UE user equipment
  • a UE may communicate using a carrier aggregation (CA) configuration.
  • a UE may also simultaneously monitor communications on another network.
  • the UE may periodically tune a radio away from a frequency of an SCell of the carrier aggregation configuration to receive signals on the other network.
  • the UE may not receive messages sent on the SCell, and so may not send acknowledgements for those messages.
  • a base station may determine, based on not receiving acknowledgements, that the channel quality on the SCell is insufficient and may deactivate the cell. This may reduce throughput for the UE.
  • a user equipment may identify one or more parameters related to a secondary cell (SCell) of a carrier aggregation configuration, and the UE may select an acknowledgement mode during a period designated for monitoring a different network or radio access technology (RAT) .
  • This monitoring period may be referred to as a tune-away period or tune-away gap.
  • the UE may determine whether the SCell is scheduled using cross carrier scheduling, whether the variance in resources used for physical uplink control channel (PUCCH) transmission is below a threshold, whether the scheduling correlation between the primary cell (PCell) of the carrier aggregation configuration of the SCell is below a threshold, whether the length of the tune-away period is below a threshold and/or whether the PCell physical downlink shared channel (PDSCH) discard (e.g., a retransmission ratio) is below a threshold.
  • the UE may transmit one or more acknowledgements (ACKs) for messages not actually received on the SCell during the tune-away period. These false ACKs may avoid cause the base station to avoid determination that transmission on the SCell are lost, which may help ensure that a serving base station does not deactivate the SCell.
  • ACKs acknowledgements
  • a method of wireless communication may include identifying one or more parameters of a secondary cell (SCell) of a carrier aggregation (CA) configuration for a first radio access technology (RAT) , tuning a radio away from a radio frequency band of the SCell during a period designated for monitoring a second RAT, selecting a hybrid automatic repeat request (HARQ) acknowledgement (ACK) mode for the SCell based at least in part on the one or more parameters of the SCell, and operating according to the HARQ ACK mode during the period designated for monitoring the second RAT.
  • SCell secondary cell
  • CA carrier aggregation
  • HARQ hybrid automatic repeat request
  • ACK hybrid automatic repeat request acknowledgement
  • the apparatus may include means for identifying one or more parameters of a SCell of a CA configuration for a first RAT, means for tuning a radio away from a radio frequency band of the SCell during a period designated for monitoring a second RAT, means for selecting a HARQ ACK mode for the SCell based at least in part on the one or more parameters of the SCell, and means for operating according to the HARQ ACK mode during the period designated for monitoring the second RAT.
  • the apparatus may be a mobile device.
  • the apparatus may include a processor, memory in electronic communication with the processor, and instructions stored in the memory.
  • the instructions may be operable to cause the processor to identify one or more parameters of a SCell of a CA configuration for a first RAT, tune a radio away from a radio frequency band of the SCell during a period designated for monitoring a second RAT, select a HARQ ACK mode for the SCell based at least in part on the one or more parameters of the SCell, and operate according to the HARQ ACK mode during the period designated for monitoring the second RAT.
  • a non-transitory computer readable medium for wireless communication may include instructions operable to cause a processor to identify one or more parameters of a SCell of a CA configuration for a first RAT, tune a radio away from a radio frequency band of the SCell during a period designated for monitoring a second RAT, select a HARQ ACK mode for the SCell based at least in part on the one or more parameters of the SCell, and operate according to the HARQ ACK mode during the period designated for monitoring the second RAT.
  • the one or more parameters comprise at least one scheduling parameter of the SCell or at least one parameter associated with a tune-away time for the SCell.
  • Some examples of the method, apparatus, and non-transitory computer-readable medium described above may further include processes, features, means, or instructions for identifying a variance metric in physical uplink control channel (PUCCH) resources on the SCell.
  • Some examples of the method, apparatus, and non-transitory computer-readable medium described above may further include processes, features, means, or instructions for determining that the variance metric exceeds a threshold, wherein the at least one scheduling parameter of the SCell may be based at least in part on the variance metric exceeding the threshold.
  • PUCCH physical uplink control channel
  • Some examples of the method, apparatus, and non-transitory computer-readable medium described above may further include processes, features, means, or instructions for receiving a transmit power control (TPC) command for SCell downlink HARQ feedback.
  • Some examples of the method, apparatus, and non-transitory computer-readable medium described above may further include processes, features, means, or instructions for updating the variance metric based at least in part on the TPC command.
  • TPC transmit power control
  • Some examples of the method, apparatus, and non-transitory computer-readable medium described above may further include processes, features, means, or instructions for determining that the SCell may be not scheduled using cross-carrier scheduling. Some examples of the method, apparatus, and non-transitory computer-readable medium described above may further include processes, features, means, or instructions for identifying a correlation between scheduling of a primary cell (PCell) and scheduling of the SCell based at least in part on the determination. Some examples of the method, apparatus, and non-transitory computer-readable medium described above may further include processes, features, means, or instructions for determining that the correlation exceeds a threshold, wherein the at least one scheduling parameter of the SCell may be based at least in part on the correlation exceeding the threshold.
  • PCell primary cell
  • Some examples of the method, apparatus, and non-transitory computer-readable medium described above may further include processes, features, means, or instructions for determining that the correlation exceeds a threshold, wherein the at least one scheduling parameter of the SCell may be based at least in part
  • Some examples of the method, apparatus, and non-transitory computer-readable medium described above may further include processes, features, means, or instructions for determining that the SCell may be scheduled using cross-carrier scheduling, wherein the at least one scheduling parameter of the SCell may be based at least in part on the SCell being scheduled using cross-carrier scheduling.
  • Some examples of the method, apparatus, and non-transitory computer-readable medium described above may further include processes, features, means, or instructions for identifying a retransmission metric of PDSCH transmissions from a PCell and determining that the retransmission metric exceeds a threshold, where the at least one scheduling parameter of the SCell is based on the retransmission metric exceeding the threshold.
  • operating according to the HARQ ACK mode comprises: transmitting an ACK for the SCell during the period designated for monitoring the second RAT, wherein the transmitting based at least in part on the HARQ ACK mode.
  • the ACK comprises a false ACK.
  • operating according to the HARQ ACK mode comprises: refraining from transmitting an ACK for the SCell during the period designated for monitoring the second RAT, the refraining may be based at least in part on the HARQ ACK mode.
  • Some examples of the method, apparatus, and non-transitory computer-readable medium described above may further include processes, features, means, or instructions for falling back to a single carrier mode based at least in part on refraining from transmitting the ACK.
  • FIG. 1 illustrates an example of a system for wireless communication that supports secondary cell (SCell) acknowledgement handling during a tune-away gap in accordance with aspects of the present disclosure.
  • SCell secondary cell
  • FIG. 2 illustrates an example of a wireless system that supports SCell acknowledgement handling during a tune-away gap in accordance with aspects of the present disclosure.
  • FIG. 3 illustrates an example of a decision tree in a system that supports SCell acknowledgement handling during a tune-away gap in accordance with aspects of the present disclosure.
  • FIG. 4 illustrates an example of a process flow for a system that supports SCell acknowledgement handling during a tune-away gap in accordance with aspects of the present disclosure.
  • FIGs. 5 through 7 show block diagrams of a device or devices that support SCell acknowledgement handling during a tune-away gap in accordance with aspects of the present disclosure.
  • FIG. 8 illustrates a block diagram of a system, including a mobile device, that supports SCell acknowledgement handling during a tune-away gap in accordance with aspects of the present disclosure.
  • FIGs. 9 through 13 illustrate methods for SCell acknowledgement handling during a tune-away gap in accordance with aspects of the present disclosure.
  • a user equipment may communicate with more than one cell in a carrier aggregation (CA) configuration.
  • the UE may utilize more than one radio chain for communicating on the different cells of the CA configuration.
  • the UE may also simultaneously monitor communications on another network, which may utilize a different radio access technology (RAT) .
  • RAT radio access technology
  • the UE may thus periodically tune a radio away from a frequency of one of the cells of the CA configuration (e.g., from a secondary cell (SCell) in order to receive signals on the other network.
  • SCell secondary cell
  • the UE may not receive messages sent on the SCell, and may not send acknowledgements for those messages. Accordingly, the serving base station may determine that the channel quality on the SCell is insufficient and may alter the transmission parameters or deactivate the SCell. This may reduce throughput for the UE following the QCTA.
  • QCTA quick carrier tune-away
  • a UE may modify its operation to avoid having a serving base station alter transmission parameters or deactivate an SCell.
  • a UE may determine one or more parameters related to an SCell and select an acknowledgement mode during a QCTA period based on the parameters. For instance, the UE may determine whether the SCell is scheduled using cross carrier scheduling, whether the variance in resources used for physical uplink control channel (PUCCH) transmission (i.e., resources that may be signaled using a transmit power command (TPC) on the SCell) is below a threshold, whether the scheduling correlation between the PCell and the SCell is below a threshold, and/or whether the length of the QCTA period is below a threshold.
  • PUCCH physical uplink control channel
  • the UE may transmit one or more acknowledgement messages on the PCell for messages on the SCell during the QCTA period. That is, the UE may tune away a radio so that it is not monitoring the SCell, but the UE may still acknowledge SCell transmissions in order to prevent deactivation of the SCell.
  • the UE may also monitor the PCell to determine whether the acknowledgement mode is impacting PCell communications. If the impact is significant, the UE may terminate the acknowledgement mode. In some cases, the UE may also transmit one or more negative acknowledgements on the SCell prior to the QCTA to leverage an SCell hybrid automatic repeat request (HARQ) context. If the parameters are not met, the UE may default back to a mode in which no acknowledgements are sent on the SCell during the QCTA. In some cases, this may include falling back to single carrier operations.
  • HARQ SCell hybrid automatic repeat request
  • the wireless system may support SCell acknowledgement handling during a tune-away gap.
  • a UE in the wireless system may tune away from an SCell to monitor a second RAT.
  • the UE may transmit an acknowledgement for the SCell while tuned away from the SCell.
  • Aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flowcharts that relate to SCell acknowledgement handling during a tune-away gap.
  • FIG. 1 illustrates an example of a wireless communications system 100 in accordance with various aspects of the present disclosure.
  • the wireless communications system 100 includes base stations 105, UEs 115, and a core network 130.
  • the wireless communications system 100 may be a LTE (or LTE-Advanced) network.
  • the wireless communication system may support SCell acknowledgement handling during a tune-away gap in accordance with aspects of the present disclosure.
  • a UE 115 may identify parameters related to an SCell and tune away from the SCell to monitor a second RAT. Based on the parameters, the UE 115 may transmit an ACK for messages that were not received on the SCell to help ensure that a serving base station 105 does not deactivate the SCell.
  • Base stations 105 may wirelessly communicate with UEs 115 via one or more base station antennas. Each base station 105 may provide communication coverage for a respective geographic coverage area 110. Communication links 125 shown in wireless communications system 100 may include UL transmissions from a UE 115 to a base station 105, or DL transmissions from a base station 105 to a UE 115. UEs 115 may be dispersed throughout the wireless communications system 100, and each UE 115 may be stationary or mobile.
  • a UE 115 may also be referred to as a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology.
  • a UE 115 may be a cellular phone, a personal digital assistant (PDA) , a wireless modem, a wireless communication device, a handheld device, a tablet computer, a laptop computer, a cordless phone, a personal electronic device, a handheld device, a personal computer, a wireless local loop (WLL) station, an Internet of things (IoT) device, an Internet of Everything (IoE) device, a machine type communication (MTC) device, an appliance, an automobile, or the like.
  • PDA personal digital assistant
  • WLL wireless local loop
  • IoT Internet of things
  • IoE Internet of Everything
  • MTC machine type communication
  • Base stations 105 may communicate with the core network 130 and with one another. For example, base stations 105 may interface with the core network 130 through backhaul links 132 (e.g., S1, etc. ) . Base stations 105 may communicate with one another over backhaul links 134 (e.g., X2, etc. ) either directly or indirectly (e.g., through core network 130) . Base stations 105 may perform radio configuration and scheduling for communication with UEs 115, or may operate under the control of a base station controller (not shown) . In some examples, base stations 105 may be macro cells, small cells, hot spots, or the like. Base stations 105 may also be referred to as eNodeBs (eNBs) 105.
  • eNodeBs eNodeBs
  • a base station 105 and a UE 115 may communicate using more than one carrier.
  • Each aggregated carrier is referred to as a component carrier (CC) .
  • CC component carrier
  • Each component can have a bandwidth of, e.g., 1.4, 3, 5, 10, 15, or 20MHz.
  • the number of CCs can be limited to, e.g., a maximum of five giving maximum aggregated bandwidth is 100 MHz.
  • FDD frequency division duplexing
  • the number of aggregated carriers can be different in DL and UL.
  • the number of UL component carriers may be equal to or lower than the number of DL component carriers.
  • the individual component carriers can also be of different bandwidths.
  • Component carriers may be arranged in a number of ways. For example, a CA configuration may be based on contiguous component carriers within the same operating frequency band, i.e., called intra-band contiguous CA. Non-contiguous allocations can also be used, where the component carriers may be either be intra-band, or inter-band.
  • Some wireless systems may support cross-carrier scheduling.
  • cross carrier scheduling a control channel transmitted on one CC may be enabled to convey control information for other configured CCs.
  • PDCCH on one CC may schedule data transmissions for another CC by utilizing a carrier indicator field (CIF) in a resource grant or grant message.
  • CIF carrier indicator field
  • a UE 115 and base station 105 may utilize hybrid automatic repeat request (HARQ) to ensure that data is successfully received over the wireless interface.
  • HARQ may include a combination of error detection (e.g., using a CRC) , FEC, and retransmission (e.g., automatic repeat request (ARQ) ) .
  • HARQ may improve throughput at the MAC layer in poor radio conditions (e.g., signal-to-noise conditions) .
  • Incremental Redundancy HARQ incorrectly received data may be stored in a buffer and combined with subsequent transmissions to improve the overall likelihood of successfully decoding the data. In some cases, redundancy bits are added to each message prior to transmission. This may be useful in poor conditions.
  • redundancy bits are not added to each transmission, but are retransmitted after the transmitter of the original message receives a NACK indicating a failed attempt to decode the information.
  • the chain of transmission, response and retransmission may be referred to as a HARQ process.
  • a limited number of HARQ processes may be used for a given communication link 125.
  • wireless communications system 100 may utilize one or more eCCs.
  • An eCC may be characterized by one or more features including flexible bandwidth or different TTI durations.
  • an eCC may be associated with a CA configuration or a dual connectivity configuration (e.g., when multiple serving cells have a suboptimal backhaul link) .
  • An eCC may also be configured for use in unlicensed spectrum or shared spectrum (e.g., where more than one operator is licensed to use the spectrum) .
  • An eCC may be associated with 5G New Radio (NR) operation.
  • NR 5G New Radio
  • An eCC characterized by flexible bandwidth may include one or more segments that may be utilized by UEs 115 that do are not capable of monitoring the whole bandwidth or prefer to use a limited bandwidth (e.g., to conserve power) .
  • an eCC may utilize a different TTI length than other CCs, which may include use of a reduced or variable symbol duration as compared with TTIs of the other CCs. The symbol duration may remain the same, in some cases, but each symbol may represent a distinct TTI.
  • An eCC may also include modified or additional HARQ related control information.
  • a UE 115 in the wireless communications system 100 may tune away from an SCell (e.g., an SCell of a CA configuration represented by a link 125) to monitor a second RAT.
  • the UE 115 may transmit an acknowledgement for the SCell while tuned away from the SCell.
  • FIG. 2 illustrates an example of a wireless system 200 that supports SCell acknowledgement handling during a tune-away gap.
  • the wireless system 200 may include base station 105-a and base station 105-b, which may each be an example of a base station 105 as described with reference to FIG. 1.
  • Base station 105-a may communicate using a first radio access technology (RAT)
  • base station 105-b may communicate using a second RAT that is different from the first RAT.
  • RAT radio access technology
  • base station 105-a may communicate according a version or release of the LTE standard
  • base station 105-b may communication according to UMTS, CDMA2000, 1xRTT, or another standard or protocol.
  • one of base stations 105-aor 105-b may communicate using 5G NR.
  • the wireless system may also include UE 115-a, which may be an example of a UE 115 as described with reference to FIG. 1.
  • UE 115-a may tune a radio away from an SCell of base station 105-a to communicate with base station 105-b using the second RAT.
  • UE 115-a may identify one or more parameters related to an SCell of base station 105-a and select an acknowledgement mode during a QCTA period based on the one or more parameters. For example, the parameters may be based on whether the SCell is cross-carrier scheduled, a variance in resources used for PUCCH transmission, whether a scheduling correlation metric between the PCell and the SCell is below a threshold, or whether the duration of the QCTA period is below a threshold.
  • UE 115-a may be a multi-subscriber identity module (MSIM) configured, concurrent radio access technology (CRAT) configured UE 115.
  • UE 115-a may choose an acknowledgement mode based on a dual receiver, dual sim, dual standby (DR-DSDS) configuration.
  • MSIM multi-subscriber identity module
  • CRAT concurrent radio access technology
  • UE 115-a may transmit one or more acknowledgement messages on the PCell relating to messages on the SCell which may have been missed during the QCTA period. That is, UE 115-a may tune away a radio to monitor another RAT, but UE 115-a may still acknowledge SCell transmissions in order to prevent base station 105-a from deactivating the SCell.
  • UE 115-a may choose an acknowledgement mode based on whether a CA configuration uses cross carrier scheduling. If UE 115-a is scheduled by SCell PDCCH scheduling, UE 115-a may miss scheduling grants for the SCell when UE 115-a tunes away to monitor another RAT. Thus, UE 115-a may not know whether UE 115-a is being scheduled, and may not know whether to send an ACK (i.e., a fake or false ACK) to prevent base station 105-a from deactivating the SCell. If UE 115-a does transmit an ACK, UE 115-a may use PUCCH format 1b with channel selection, PUCCH format 3, or PUSCH.
  • UE 115-a may not know which resources to use for sending the ACK even if UE 115-a does know when UE 115-a is being scheduled. Therefore, UE 115-a may choose a QCTA acknowledgment mode where UE 115-a does not send any false ACKs.
  • UE 115-a may determine an acknowledgement mode based on a PUCCH resource variance parameter. That is, UE 115-a may determine whether there is an acceptable level of ambiguity as to which resources it should use for transmitting a false ACK.
  • the acknowledgement mode may include which PUCCH format to use for the acknowledgement and may be based on a variance of recently used PUCCH formats. If UE 115-a and base station 105-a expect communication using different formats (e.g., one chooses PUCCH format 1b and another PUCCH format 3) , base station 105-a may fail to decode an acknowledgement from UE 115-a. In some cases, this may also affect PCell ACKs.
  • UE 115-a may determine a variance of the PUCCH resources. If there is a low variance in the PUCCH resource format, UE 115-a may use the most recent PUCCH format (e.g., PUCCH format 1b or PUCCH format 3) to transmit the acknowledgement. Otherwise (e.g., there is high variance of the PUCCH resources or format) , UE 115-a may refrain from sending ACKs for the SCell during the QCTA period.
  • PUCCH format 1b or PUCCH format 3 e.g., PUCCH format 1b or PUCCH format
  • UE 115-a may determine an acknowledgement format based on a correlation between SCell scheduling and PCell scheduling. That is, in some cases, the resources and format used for PCell ACKs provides information regarding what format or resources to use for transmitting ACKs for the SCell. Thus, even if UE 115-a detects a high variance in format for PUCCH resources and the PUCCH resource format is ambiguous, then UE 115-a may determine an acknowledgement format based on PCell scheduling. So UE 115-a may track the correlation between the PCell and SCell scheduling and enable the acknowledgement mode only when the correlation is high. UE 115-a may exit the false ACK mode if the PCell ACK/NAK feedback is not reliable or may be impacted.
  • UE 115-a may leverage the SCell HARQ context by a false NAK that is transmitted before the QCTA. In some cases, UE 115-a may keep record of PUCCH resources used for SCell downlink HARQ feedback on a per subframe basis.
  • UE 115-a may choose an acknowledgement mode in which UE 115-a does not send an ACK during the QCTA. For example, UE 115-a may not transmit the ACK during the QCTA based on a determination that sending a false ACK may affect PCell communications. Thus, UE 115-a may monitor the PCell to determine whether the acknowledgement may affect PCell communications. If the acknowledgement mode may impact the PCell communications, UE 115-a may terminate the acknowledgements on the SCell prior to the QCTA to leverage an SCell hybrid automatic repeat request (HARQ) context.
  • HARQ SCell hybrid automatic repeat request
  • UE 115-a may default back to a mode in which no acknowledgements are sent on the SCell during the QCTA. In some cases, UE 115-a may fall back into single carrier operations. In another example, the UE may determine that there is no PCell downlink scheduling, and UE 115-a may conclude SCell scheduling is also unlikely. Then, UE 115-a may not receive PCell or SCell downlink HARQ feedback.
  • UE 115-a may determine that a PUCCH resource variation metric for an SCell does not meet a threshold, and UE 115-a may fall back to a single carrier downlink HARQ feedback mode.
  • a PCell or SCell downlink scheduling correlation metric may not meet a threshold, and UE 115-a may fall back to a single carrier downlink HARQ PUCCH feedback mode.
  • UE 115-a may, for example, update parameters to determine an acknowledgement mode for a next QCTA. For example, UE 115-a may update the PUCCH resource variation metric based on an SCell TPC command for SCell downlink HARQ feedback. UE 115-a may update the SCell and PCell correlation parameter based on PCell and SCell scheduling information on a per subframe basis. Furthermore, UE 115-a may record instant PUCCH resource sets used for SCell downlink HARQ feedback on a per subframe basis, which UE 115-a may use to determine a variance of PUCCH formats.
  • FIG. 3 illustrates an example of a decision tree 300 a system that supports SCell acknowledgement handling during a tune-away gap.
  • the decision tree 300 may depict a decision making process for a UE 115 to choose an acknowledgement mode while entering a QCTA period.
  • the UE may determine to operate in a particular HARQ feedback mode based on one more observations, measurements, determinations, or the like.
  • the UE 115 may determine there is a correlation between PCell scheduling and SCell scheduling (e.g., the UE 115 may determine that is its frequently scheduled for communication on the SCell when it is scheduled for communication on the PCell) and may select a HARQ feedback mode based on the correlation.
  • the UE 115 may determine a correlation between resources of an SCell (e.g., certain resources designated for HARQ feedback may be frequently associated with resources used for transmission on the SCell) and may select a HARQ feedback mode based on the correlation. Or, the UE 115 may determine that the SCell is cross-carrier scheduled and select a HARQ feedback mode based on the determination. Or, the UE 115 may determine a duration of the tune-away gap and select a HARQ feedback mode based on the determination. The UE 115 may also choose a HARQ feedback mode based on any combination of such observations, measurements, determinations, or the like.
  • resources of an SCell e.g., certain resources designated for HARQ feedback may be frequently associated with resources used for transmission on the SCell
  • the UE 115 may determine that the SCell is cross-carrier scheduled and select a HARQ feedback mode based on the determination.
  • the UE 115 may determine a duration of the tune-away gap and select a HARQ feedback
  • the UE 115 may determine if there is downlink scheduling at decision 305. That is, the UE 115 may determine if there is PCell downlink scheduling for transmissions on an SCell.
  • the UE 115 may determine that there will not be, or is unlikely to be, SCell downlink scheduling at block 310. In some examples, the UE 115 may behave as though there is not SCell scheduling. At block 315, the UE 115 may determine not to initiate transmission of PCell or SCell downlink HARQ feedback.
  • the UE 115 may then determine which resources are used for transmitting uplink control information (UCI) (including ACK/NACK information) is transmitted at decision 320.
  • UCI uplink control information
  • the UE 115 determines that UCI is to be transmitted using PUSCH.
  • the UE 115 may treat SCell downlink HARQ feedback as an ACK for some transmission modes—for example transmission modes 1, 2, 5, 6, and 7—and the UE 115 may treat downlink HARQ feedback as ACK/ACK for other transmission modes—for example transmission modes 3, 4, 8, and 9.
  • the UE 115 may determine a PUCCH resource variation metric at decision 330. If the PUCCH resource variation metric ( “S_PUCCH_Var” ) is greater than a variation threshold, the UE 115 may fall back to a single carrier mode and feedback PCell downlink HARQ information at block 335. When an SCell is activated or a base station 105 sets or changes the SCell transmission mode (e.g., transmission mode 3 to transmission mode 7) , the UE 115 may reset the PUCCH resource variation metric to 0 and reset a power control (TPC) metric ( “PRV_TPC” ) to “00.
  • TPC power control
  • the UE 115 may keep a record of any SCell TPC command in the special subframe using the TPC metric. If there is no PUSCH transmission in the special subframe, the UE 115 may calculate and update a filtered SCell PUCCH resource variation metric based on equation (1) below.
  • the UE 115 may set PRV_TPC to TPCval (n-4) .
  • the S_PUCCH_var value for the next (e.g., n+1) subframe may be determined based on whether the TPC adjustment for subframe n-4 matches the most recent TPC adjustment (e.g., n-1) .
  • ⁇ is set to around 0.05, and may weigh more on more recent scheduling.
  • the UE 115 may then determine a scheduling correlation metric ( “P_S_SCH_Corr” ) at decision 340. If the scheduling correlation metric is greater than a threshold, the UE 115 may determine a duration of a gap (i.e., between the current subframe and the QCTA period) at decision 345.
  • the ML1 may set the PCell/SCell scheduling correlation metric to 0 if an SCell is activated.
  • the PCell/SCell scheduling correlation metric may be on a per SCell basis (e.g., each SCell has a PCell/SCell scheduling correlation metric) . For each downlink subframe with PCell or SCell scheduling, the UE 115 may calculate and update a filtered PCell/SCell scheduling correlation metric based on equation (2) .
  • ⁇ may be set to 0.05 and weigh more on more recent schedulings.
  • the UE 115 may also determine a PCell PDSCH retransmission metric.
  • the UE 115 may determine the PCell PDSCH retransmission metric based on a ratio of PDSCH retransmissions to PDSCH discards.
  • the UE 115 may initialize a counter, “PCell_ReTx, ” once the SCell is tuned away. PCell_ReTx may be determined based on equation (3) .
  • PCell_ReTx (n+1) (1- ⁇ ) *PCell_ReTx (n) + ⁇ *ReTx (3)
  • PCell_ReTx exceeds a threshold ( “ReTx_Threshold” ) , the UE 115 may fall back to single carrier mode and only initiate PCell downlink HARQ feedback.
  • ⁇ may be set to 0.02, or a time constant of approximately 4 ms if each subframe has PDSCH data.
  • ReTx_Threshold may be 0.5.
  • the UE 115 may reuse the SCell PUCCH format resource set before the gap to build a PUCCH format resource set for channel selection at block 350.
  • the UE 115 may treat SCell downlink HARQ feedback as ACK for some transmission modes, for example transmission modes 1, 2, 5, 6, and 7, and the UE 115 may treat downlink HARQ feedback as ACK/ACK for other transmission modes, for example transmission modes 3, 4, 8, and 9.
  • the UE 115 may then resume the current PUCCH format procedure based on PCell and SCell downlink HARQ bit combinations and the PUCCH format resource set at block 355.
  • the UE 115 may map PCell and SCell downlink HARQ feedback to a corresponding PUCCH resource set.
  • the UE 115 may decide to fall back to single carrier mode and only initiate PCell downlink HARQ feedback instead at block 335.
  • the PUCCH resource variation threshold may be around 10%and the PCell/SCell correlation threshold may be around 90%.
  • the UE 115 may try to send ACK feedback to terminate one or more downlink HARQ processes. For example, the UE 115 may terminate downlink HARQ scheduling with a modulation and coding scheme 29, 30, or 31, or a non-redundancy version downlink HARQ scheduling without a redundancy version log-likelihood ratio (LLR) sample buffered.
  • LLR redundancy version log-likelihood ratio
  • FIG. 4 illustrates an example of a process flow 400 in a system that supports SCell acknowledgement handling during a tune-away gap.
  • the process flow 400 may include UE 115-b, which may be an example of a UE 115 as described herein with reference to FIGS. 1-3.
  • the process flow 400 may also include base station 105-c and base station 105-d, which may each be an example of a base station 105 as described herein with reference to FIGs. 1-3.
  • Base station 105-c may communicate using a first RAT
  • base station 105-d may communicate using a second RAT.
  • UE 115-b may have a carrier aggregation configuration for communication with base station 105-c.
  • UE 115-b may communicate on a PCell and an SCell of base station 105-c.
  • UE 115-b may communicate with a PCell of base station 105-c and an SCell of one or more other base stations 105 not shown.
  • UE 115-b may communicate with base station 105-c using a first RAT, such as LTE.
  • UE 115-b may identify one or more parameters of the SCell of base station 105-c.
  • the parameters may include at least one scheduling parameter of the SCell or at least one parameter based on a tune-away time for the SCell.
  • the scheduling parameter may be based on a variance metric of PUCCH resources on the SCell exceeding a threshold.
  • the scheduling parameter may also be based on a correlation between PCell scheduling and SCell scheduling exceeding a threshold.
  • the scheduling parameter may also be based on whether the SCell is scheduling using cross carrier scheduling.
  • UE 115-b may select an HARQ acknowledgment mode.
  • UE 115-b may select the HARQ mode for the SCell based on the one or more parameters.
  • UE 115-b may tune away a radio used for the SCell of base station 105-c.
  • the UE may tune the radio away during a period designated for monitoring a second RAT, which may be different from the first RAT (e.g., UMTS, CDMA2000, 1xRTT, GSM, etc. ) used by base station 105-d.
  • the first RAT e.g., UMTS, CDMA2000, 1xRTT, GSM, etc.
  • UE 115-b may monitor the second RAT used by base station 105-d.
  • UE 115-b may continue to communicate on the PCell of base station 105-c using a first radio while the second radio is tuned away to monitor the second RAT.
  • UE 115-b may transmit an ACK for the SCell during the period designated for monitoring the second RAT based on the HARQ acknowledgement mode.
  • the ACK may be a false ACK.
  • UE 115-b may refrain from transmitting an ACK for the SCell during the period designated for monitoring the second RAT based on the HARQ acknowledgement mode.
  • UE 115-b may fall back to a single carrier mode based on the refraining from transmitting the ACK.
  • UE 115-b may tune the second radio back to the SCell of base station 105-c.
  • FIG. 5 shows a block diagram 500 of a wireless device 505 that supports SCell acknowledgement handling during a tune-away gap in accordance with various aspects of the present disclosure.
  • Wireless device 505 may be an example of aspects of a UE 115 as described with reference to FIG. 1.
  • Wireless device 505 may include receiver 510, tune away manager 515, and transmitter 520.
  • Wireless device 505 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .
  • Receiver 510 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to SCell acknowledgement handling during a tune-away gap, etc. ) . Information may be passed on to other components of the device.
  • the receiver 510 may be an example of aspects of the transceiver 835 described with reference to FIG. 8.
  • Tune away manager 515 may be an example of aspects of the tune away manager 815 described with reference to FIG. 8.
  • Tune away manager 515 may identify one or more parameters of a SCell of a CA configuration for a first RAT, tune a radio away from a radio frequency band of the SCell during a period designated for monitoring a second RAT, select a HARQ ACK mode for the SCell based on the one or more parameters of the SCell, and operate according to the HARQ ACK mode during the period designated for monitoring the second RAT.
  • Transmitter 520 may transmit signals generated by other components of the device.
  • the transmitter 520 may be collocated with a receiver 510 in a transceiver module.
  • the transmitter 520 may be an example of aspects of the transceiver 835 described with reference to FIG. 8.
  • the transmitter 520 may include a single antenna, or it may include a set of antennas.
  • FIG. 6 shows a block diagram 600 of a wireless device 605 that supports SCell acknowledgement handling during a tune-away gap in accordance with various aspects of the present disclosure.
  • Wireless device 605 may be an example of aspects of a wireless device 505 or a UE 115 as described with reference to FIGs. 1 and 5.
  • Wireless device 605 may include receiver 610, tune away manager 615, and transmitter 620.
  • Wireless device 605 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses) .
  • Receiver 610 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to SCell acknowledgement handling during a tune-away gap, etc. ) . Information may be passed on to other components of the device.
  • the receiver 610 may be an example of aspects of the transceiver 835 described with reference to FIG. 8.
  • Tune away manager 615 may be an example of aspects of the tune away manager 815 described with reference to FIG. 8. Tune away manager 615 may also include CA component 625, retuning component 630, and HARQ mode component 635.
  • CA component 625 may identify one or more parameters of a SCell of a CA configuration for a first RAT.
  • the one or more parameters include at least one scheduling parameter of the SCell or at least one parameter associated with a tune-away time for the SCell.
  • Retuning component 630 may tune a radio away from a radio frequency band of the SCell during a period designated for monitoring a second RAT.
  • HARQ mode component 635 may select a HARQ ACK mode for the SCell based on the one or more parameters of the SCell and operate according to the HARQ ACK mode during the period designated for monitoring the second RAT.
  • operating according to the HARQ ACK mode includes: transmitting an ACK for the SCell during the period designated for monitoring the second RAT, where the transmitting based on the HARQ ACK mode.
  • the ACK includes a false ACK.
  • operating according to the HARQ ACK mode includes: refraining from transmitting an ACK for the SCell during the period designated for monitoring the second RAT, the refraining is based on the HARQ ACK mode.
  • Transmitter 620 may transmit signals generated by other components of the device.
  • the transmitter 620 may be collocated with a receiver 610 in a transceiver module.
  • the transmitter 620 may be an example of aspects of the transceiver 835 described with reference to FIG. 8.
  • the transmitter 620 may include a single antenna, or it may include a set of antennas.
  • FIG. 7 shows a block diagram 700 of a tune away manager 715 that supports SCell acknowledgement handling during a tune-away gap in accordance with various aspects of the present disclosure.
  • the tune away manager 715 may be an example of aspects of a tune away manager 515, a tune away manager 615, or a tune away manager 815 described with reference to FIGs. 5, 6, and 8.
  • the tune away manager 715 may include CA component 720, retuning component 725, HARQ mode component 730, variance metric component 735, TPC component 740, cross-carrier scheduling component 745, scheduling correlation component 750, and single carrier operation component 755. Each of these modules may communicate, directly or indirectly, with one another (e.g., via one or more buses) .
  • CA component 720 may identify one or more parameters of a SCell of a CA configuration for a first RAT.
  • Retuning component 725 may tune a radio away from a radio frequency band of the SCell during a period designated for monitoring a second RAT.
  • HARQ mode component 730 may select a HARQ ACK mode for the SCell based on the one or more parameters of the SCell and operate according to the HARQ ACK mode during the period designated for monitoring the second RAT.
  • Variance metric component 735 may identify a variance metric in physical uplink control channel (PUCCH) resources on the SCell, determine that the variance metric exceeds a threshold, where the at least one scheduling parameter of the SCell is based on the variance metric exceeding the threshold, and update the variance metric based on the TPC command.
  • TPC component 740 may receive a transmit power control (TPC) command for SCell downlink HARQ feedback.
  • TPC transmit power control
  • Cross-carrier scheduling component 745 may determine whether the SCell is the SCell is scheduled using cross-carrier scheduling, where the at least one scheduling parameter of the SCell is based on the SCell being scheduled using cross-carrier scheduling.
  • Scheduling correlation component 750 may identify a correlation between scheduling of a PCell and scheduling of the SCell based on the determination and determine that the correlation exceeds a threshold, where the at least one scheduling parameter of the SCell is based on the correlation exceeding the threshold.
  • Single carrier operation component 755 may fall back to a single carrier mode based on refraining from transmitting the ACK.
  • FIG. 8 shows a diagram of a system 800 including a device 805 that supports SCell acknowledgement handling during a tune-away gap in accordance with various aspects of the present disclosure.
  • Device 805 may be an example of or include the components of wireless device 505, wireless device 605, or a UE 115 as described above, e.g., with reference to FIGs. 1, 5 and 6.
  • Device 805 may include components for bi-directional voice and data communications including components for transmitting and receiving communications, including tune away manager 815, processor 820, memory 825, software 830, transceiver 835, antenna 840, and I/O controller 845. These components may be in electronic communication via one or more busses (e.g., bus 810) .
  • Device 805 may communicate wirelessly with one or more base stations 105.
  • Processor 820 may include an intelligent hardware device, (e.g., a general-purpose processor, a digital signal processor (DSP) , a central processing unit (CPU) , a microcontroller, an application-specific integrated circuit (ASIC) , an field-programmable gate array (FPGA) , a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) .
  • processor 820 may be configured to operate a memory array using a memory controller.
  • a memory controller may be integrated into processor 820.
  • Processor 820 may be configured to execute computer-readable instructions stored in a memory to perform various functions (e.g., functions or tasks supporting SCell acknowledgement handling during a tune-away gap) .
  • Memory 825 may include random access memory (RAM) and read only memory (ROM) .
  • the memory 825 may store computer-readable, computer-executable software 830 including instructions that, when executed, cause the processor to perform various functions described herein.
  • the memory 825 may contain, among other things, a basic input/output system (BIOS) which may control basic hardware and/or software operation such as the interaction with peripheral components or devices.
  • BIOS basic input/output system
  • Software 830 may include code to implement aspects of the present disclosure, including code to support SCell acknowledgement handling during a tune-away gap.
  • Software 830 may be stored in a non-transitory computer-readable medium such as system memory or other memory. In some cases, the software 830 may not be directly executable by the processor but may cause a computer (e.g., when compiled and executed) to perform functions described herein.
  • Transceiver 835 may communicate bi-directionally, via one or more antennas, wired, or wireless links as described above.
  • the transceiver 835 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver.
  • the transceiver 835 may also include a modem to modulate the packets and provide the modulated packets to the antennas for transmission, and to demodulate packets received from the antennas.
  • the wireless device may include a single antenna 840. However, in some cases the device may have more than one antenna 840, which may be capable of concurrently transmitting or receiving multiple wireless transmissions.
  • I/O controller 845 may manage input and output signals for device 805. I/O controller 845 may also manage peripherals not integrated into device 805. In some cases, I/O controller 845 may represent a physical connection or port to an external peripheral. In some cases, I/O controller 845 may utilize an operating system such as MS- or another known operating system.
  • FIG. 9 shows a flowchart illustrating a method 900 for SCell acknowledgement handling during a tune-away gap in accordance with various aspects of the present disclosure.
  • the operations of method 900 may be implemented by a UE 115 or its components as described herein.
  • the operations of method 900 may be performed by a tune away manager as described with reference to FIGs. 5 through 8.
  • a UE 115 may execute a set of codes to control the functional elements of the device to perform the functions described below. Additionally or alternatively, the UE 115 may perform aspects the functions described below using special-purpose hardware.
  • the UE 115 may identify one or more parameters of a SCell of a CA configuration for a first RAT.
  • the operations of block 905 may be performed according to the methods described with reference to FIGs. 1 through 4. In certain examples, aspects of the operations of block 905 may be performed by a CA component as described with reference to FIGs. 5 through 8.
  • the UE 115 may tune a radio away from a radio frequency band of the SCell during a period designated for monitoring a second RAT.
  • the operations of block 910 may be performed according to the methods described with reference to FIGs. 1 through 4. In certain examples, aspects of the operations of block 910 may be performed by a retuning component as described with reference to FIGs. 5 through 8.
  • the UE 115 may select a HARQ ACK mode for the SCell based at least in part on the one or more parameters of the SCell.
  • the operations of block 915 may be performed according to the methods described with reference to FIGs. 1 through 4. In certain examples, aspects of the operations of block 915 may be performed by a HARQ mode component as described with reference to FIGs. 5 through 8.
  • the UE 115 may operate according to the HARQ ACK mode during the period designated for monitoring the second RAT.
  • the operations of block 920 may be performed according to the methods described with reference to FIGs. 1 through 4. In certain examples, aspects of the operations of block 920 may be performed by a HARQ mode component as described with reference to FIGs. 5 through 8.
  • FIG. 10 shows a flowchart illustrating a method 1000 for SCell acknowledgement handling during a tune-away gap in accordance with various aspects of the present disclosure.
  • the operations of method 1000 may be implemented by a UE 115 or its components as described herein.
  • the operations of method 1000 may be performed by a tune away manager as described with reference to FIGs. 5 through 8.
  • a UE 115 may execute a set of codes to control the functional elements of the device to perform the functions described below. Additionally or alternatively, the UE 115 may perform aspects the functions described below using special-purpose hardware.
  • the UE 115 may identify a variance metric in PUCCH resources on the SCell.
  • the operations of block 1005 may be performed according to the methods described with reference to FIGs. 1 through 4. In certain examples, aspects of the operations of block 1005 may be performed by a variance metric component as described with reference to FIGs. 5 through 8.
  • the UE 115 may determine that the variance metric exceeds a threshold, wherein at least one scheduling parameter of the SCell is based at least in part on the variance metric exceeding the threshold.
  • the operations of block 1010 may be performed according to the methods described with reference to FIGs. 1 through 4. In certain examples, aspects of the operations of block 1010 may be performed by a variance metric component as described with reference to FIGs. 5 through 8.
  • the UE 115 may identify one or more parameters of a SCell of a CA configuration for a first RAT.
  • the one or more parameters comprise at least one scheduling parameter of the SCell or at least one parameter associated with a tune-away time for the SCell.
  • the operations of block 1015 may be performed according to the methods described with reference to FIGs. 1 through 4. In certain examples, aspects of the operations of block 1015 may be performed by a CA component as described with reference to FIGs. 5 through 8.
  • the UE 115 may tune a radio away from a radio frequency band of the SCell during a period designated for monitoring a second RAT.
  • the operations of block 1020 may be performed according to the methods described with reference to FIGs. 1 through 4. In certain examples, aspects of the operations of block 1020 may be performed by a retuning component as described with reference to FIGs. 5 through 8.
  • the UE 115 may select a HARQ ACK mode for the SCell based at least in part on the one or more parameters of the SCell.
  • the operations of block 1025 may be performed according to the methods described with reference to FIGs. 1 through 4. In certain examples, aspects of the operations of block 1025 may be performed by a HARQ mode component as described with reference to FIGs. 5 through 8.
  • the UE 115 may operate according to the HARQ ACK mode during the period designated for monitoring the second RAT.
  • the operations of block 1030 may be performed according to the methods described with reference to FIGs. 1 through 4. In certain examples, aspects of the operations of block 1030 may be performed by a HARQ mode component as described with reference to FIGs. 5 through 8.
  • FIG. 11 shows a flowchart illustrating a method 1100 for SCell acknowledgement handling during a tune-away gap in accordance with various aspects of the present disclosure.
  • the operations of method 1100 may be implemented by a UE 115 or its components as described herein.
  • the operations of method 1100 may be performed by a tune-away manager as described with reference to FIGs. 5 through 8.
  • a UE 115 may execute a set of codes to control the functional elements of the device to perform the functions described below. Additionally or alternatively, the UE 115 may perform aspects the functions described below using special-purpose hardware.
  • the UE 115 may determine that the SCell is not scheduled using cross-carrier scheduling.
  • the operations of block 1105 may be performed according to the methods described with reference to FIGs. 1 through 4. In certain examples, aspects of the operations of block 1105 may be performed by a cross-carrier scheduling component as described with reference to FIGs. 5 through 8.
  • the UE 115 may identify a correlation between scheduling of a PCell and scheduling of the SCell based at least in part on the determination.
  • the operations of block 1110 may be performed according to the methods described with reference to FIGs. 1 through 4. In certain examples, aspects of the operations of block 1110 may be performed by a scheduling correlation component as described with reference to FIGs. 5 through 8.
  • the UE 115 may determine that the correlation exceeds a threshold, wherein at least one scheduling parameter of the SCell is based at least in part on the correlation exceeding the threshold.
  • the operations of block 1115 may be performed according to the methods described with reference to FIGs. 1 through 4. In certain examples, aspects of the operations of block 1115 may be performed by a scheduling correlation component as described with reference to FIGs. 5 through 8.
  • the UE 115 may identify one or more parameters of a SCell of a CA configuration for a first RAT.
  • the one or more parameters comprise at least one scheduling parameter of the SCell or at least one parameter associated with a tune-away time for the SCell.
  • the operations of block 1120 may be performed according to the methods described with reference to FIGs. 1 through 4. In certain examples, aspects of the operations of block 1120 may be performed by a CA component as described with reference to FIGs. 5 through 8.
  • the UE 115 may tune a radio away from a radio frequency band of the SCell during a period designated for monitoring a second RAT.
  • the operations of block 1125 may be performed according to the methods described with reference to FIGs. 1 through 4. In certain examples, aspects of the operations of block 1125 may be performed by a retuning component as described with reference to FIGs. 5 through 8.
  • the UE 115 may select a HARQ ACK mode for the SCell based at least in part on the one or more parameters of the SCell.
  • the operations of block 1130 may be performed according to the methods described with reference to FIGs. 1 through 4. In certain examples, aspects of the operations of block 1130 may be performed by a HARQ mode component as described with reference to FIGs. 5 through 8.
  • the UE 115 may operate according to the HARQ ACK mode during the period designated for monitoring the second RAT.
  • the operations of block 1135 may be performed according to the methods described with reference to FIGs. 1 through 4. In certain examples, aspects of the operations of block 1135 may be performed by a HARQ mode component as described with reference to FIGs. 5 through 8.
  • FIG. 12 shows a flowchart illustrating a method 1200 for SCell acknowledgement handling during a tune-away gap in accordance with various aspects of the present disclosure.
  • the operations of method 1200 may be implemented by a UE 115 or its components as described herein.
  • the operations of method 1200 may be performed by a tune away manager as described with reference to FIGs. 5 through 8.
  • a UE 115 may execute a set of codes to control the functional elements of the device to perform the functions described below. Additionally or alternatively, the UE 115 may perform aspects the functions described below using special-purpose hardware.
  • the UE 115 may determine that the SCell is scheduled using cross-carrier scheduling, wherein at least one scheduling parameter of the SCell is based at least in part on the SCell being scheduled using cross-carrier scheduling.
  • the operations of block 1205 may be performed according to the methods described with reference to FIGs. 1 through 4. In certain examples, aspects of the operations of block 1205 may be performed by a cross-carrier scheduling component as described with reference to FIGs. 5 through 8.
  • the UE 115 may identify one or more parameters of a SCell of a CA configuration for a first RAT.
  • the one or more parameters comprise at least one scheduling parameter of the SCell or at least one parameter associated with a tune-away time for the SCell.
  • the operations of block 1210 may be performed according to the methods described with reference to FIGs. 1 through 4. In certain examples, aspects of the operations of block 1210 may be performed by a CA component as described with reference to FIGs. 5 through 8.
  • the UE 115 may tune a radio away from a radio frequency band of the SCell during a period designated for monitoring a second RAT.
  • the operations of block 1215 may be performed according to the methods described with reference to FIGs. 1 through 4. In certain examples, aspects of the operations of block 1215 may be performed by a retuning component as described with reference to FIGs. 5 through 8.
  • the UE 115 may select a HARQ ACK mode for the SCell based at least in part on the one or more parameters of the SCell.
  • the operations of block 1220 may be performed according to the methods described with reference to FIGs. 1 through 4. In certain examples, aspects of the operations of block 1220 may be performed by a HARQ mode component as described with reference to FIGs. 5 through 8.
  • the UE 115 may operate according to the HARQ ACK mode during the period designated for monitoring the second RAT.
  • the operations of block 1225 may be performed according to the methods described with reference to FIGs. 1 through 4. In certain examples, aspects of the operations of block 1225 may be performed by a HARQ mode component as described with reference to FIGs. 5 through 8.
  • FIG. 13 shows a flowchart illustrating a method 1300 for SCell acknowledgement handling during a tune-away gap in accordance with various aspects of the present disclosure.
  • the operations of method 1300 may be implemented by a UE 115 or its components as described herein.
  • the operations of method 1300 may be performed by a tune away manager as described with reference to FIGs. 5 through 8.
  • a UE 115 may execute a set of codes to control the functional elements of the device to perform the functions described below. Additionally or alternatively, the UE 115 may perform aspects the functions described below using special-purpose hardware.
  • the UE 115 may identify one or more parameters of a SCell of a CA configuration for a first RAT.
  • the operations of block 1305 may be performed according to the methods described with reference to FIGs. 1 through 4. In certain examples, aspects of the operations of block 1305 may be performed by a CA component as described with reference to FIGs. 5 through 8.
  • the UE 115 may tune a radio away from a radio frequency band of the SCell during a period designated for monitoring a second RAT.
  • the operations of block 1310 may be performed according to the methods described with reference to FIGs. 1 through 4. In certain examples, aspects of the operations of block 1310 may be performed by a retuning component as described with reference to FIGs. 5 through 8.
  • the UE 115 may select a HARQ ACK mode for the SCell based at least in part on the one or more parameters of the SCell.
  • the operations of block 1315 may be performed according to the methods described with reference to FIGs. 1 through 4. In certain examples, aspects of the operations of block 1315 may be performed by a HARQ mode component as described with reference to FIGs. 5 through 8.
  • the UE 115 may operate according to the HARQ ACK mode during the period designated for monitoring the second RAT.
  • operating according to the HARQ ACK mode may include transmitting an ACK for the SCell during the period designated for monitoring the second RAT, wherein the transmitting based at least in part on the HARQ ACK mode.
  • the UE 115 may not know whether there were transmissions on the SCell while the UE 115 monitored the second RAT. However, the UE 115 may send an ACK as though there were a transmission during the period to reduce the chance that the SCell is dropped by the network.
  • the UE 115 may transmit the ACK outside of the period designated for monitoring the second RAT.
  • the operations of block 1320 may be performed according to the methods described with reference to FIGs. 1 through 4. In certain examples, aspects of the operations of block 1320 may be performed by a HARQ mode component as described with reference to FIGs. 5 through 8.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • CDMA2000 covers IS-2000, IS-95, and IS-856 standards.
  • IS-2000 Releases may be commonly referred to as CDMA2000 1X, 1X, etc.
  • IS-856 (TIA-856) is commonly referred to as CDMA2000 1xEV-DO, High Rate Packet Data (HRPD) , etc.
  • UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA.
  • WCDMA Wideband CDMA
  • a time division multiple access (TDMA) system may implement a radio technology such as Global System for Mobile Communications (GSM) .
  • GSM Global System for Mobile Communications
  • An orthogonal frequency division multiple access (OFDMA) system may implement a radio technology such as Ultra Mobile Broadband (UMB) , Evolved UTRA (E-UTRA) , Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20, Flash-OFDM, etc.
  • UMB Ultra Mobile Broadband
  • E-UTRA Evolved UTRA
  • IEEE 802.11 Wi-Fi
  • IEEE 802.16 WiMAX
  • IEEE 802.20 WiMAX
  • Flash-OFDM Flash-OFDM
  • UTRA and E-UTRA are part of Universal Mobile Telecommunications system (UMTS) .
  • 3GPP Long Term Evolution (LTE) and LTE-Advanced (LTE-A) are new releases of Universal Mobile Telecommunications System (UMTS) that use E-UTRA.
  • UTRA, E-UTRA, UMTS, LTE, LTE-A, and Global System for Mobile communications are described in documents from the organization named “3rd Generation Partnership Project” (3GPP) .
  • CDMA2000 and UMB are described in documents from an organization named “3rd Generation Partnership Project 2” (3GPP2) .
  • the techniques described herein may be used for the systems and radio technologies mentioned above as well as other systems and radio technologies. While aspects an LTE system may be described for purposes of example, and LTE terminology may be used in much of the description, the techniques described herein are applicable beyond LTE applications.
  • the term evolved node B may be generally used to describe the base stations.
  • the wireless communications system or systems described herein may include a heterogeneous LTE/LTE-A network in which different types of evolved node B (eNBs) provide coverage for various geographical regions.
  • eNBs evolved node B
  • each eNB or base station may provide communication coverage for a macro cell, a small cell, or other types of cell.
  • the term “cell” may be used to describe a base station, a carrier or component carrier associated with a base station, or a coverage area (e.g., sector, etc. ) of a carrier or base station, depending on context.
  • Base stations may include or may be referred to by those skilled in the art as a base transceiver station, a radio base station, an access point, a radio transceiver, a NodeB, eNodeB (eNB) , Home NodeB, a Home eNodeB, or some other suitable terminology.
  • the geographic coverage area for a base station may be divided into sectors making up only a portion of the coverage area.
  • the wireless communications system or systems described herein may include base stations of different types (e.g., macro or small cell base stations) .
  • the UEs described herein may be able to communicate with various types of base stations and network equipment including macro eNBs, small cell eNBs, relay base stations, and the like. There may be overlapping geographic coverage areas for different technologies.
  • a macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions with the network provider.
  • a small cell is a lower-powered base station, as compared with a macro cell, that may operate in the same or different (e.g., licensed, unlicensed, etc. ) frequency bands as macro cells.
  • Small cells may include pico cells, femto cells, and micro cells according to various examples.
  • a pico cell for example, may cover a small geographic area and may allow unrestricted access by UEs with service subscriptions with the network provider.
  • a femto cell may also cover a small geographic area (e.g., a home) and may provide restricted access by UEs having an association with the femto cell (e.g., UEs in a closed subscriber group (CSG) , UEs for users in the home, and the like) .
  • An eNB for a macro cell may be referred to as a macro eNB.
  • An eNB for a small cell may be referred to as a small cell eNB, a pico eNB, a femto eNB, or a home eNB.
  • An eNB may support one or multiple (e.g., two, three, four, and the like) cells (e.g., component carriers) .
  • a UE may be able to communicate with various types of base stations and network equipment including macro eNBs, small cell eNBs, relay base stations, and the like.
  • the wireless communications system or systems described herein may support synchronous or asynchronous operation.
  • the base stations may have similar frame timing, and transmissions from different base stations may be approximately aligned in time.
  • the base stations may have different frame timing, and transmissions from different base stations may not be aligned in time.
  • the techniques described herein may be used for either synchronous or asynchronous operations.
  • Each communication link described herein including, for example, wireless communications system 100 and 200 of FIGs. 1 and 2—may include one or more carriers, where each carrier may be a signal made up of multiple sub-carriers (e.g., waveform signals of different frequencies) .
  • Information and signals described herein may be represented using any of a variety of different technologies and techniques.
  • data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
  • a general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration) .
  • the functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described above can be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.
  • Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • a non-transitory storage medium may be any available medium that can be accessed by a general purpose or special purpose computer.
  • non-transitory computer-readable media may comprise RAM, ROM, electrically erasable programmable read only memory (EEPROM) , compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to carry or store desired program code means in the form of instructions or data structures and that can be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor.
  • RAM random access memory
  • ROM read only memory
  • EEPROM electrically erasable programmable read only memory
  • CD compact disk
  • magnetic disk storage or other magnetic storage devices or any other non-transitory medium that can be used to carry or store desired program code means in the form of instructions or
  • any connection is properly termed a computer-readable medium.
  • the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) , or wireless technologies such as infrared, radio, and microwave
  • the coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) , or wireless technologies such as infrared, radio, and microwave are included in the definition of medium.
  • Disk and disc include CD, laser disc, optical disc, digital versatile disc (DVD) , floppy disk and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

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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 de communications sans fil. Un équipement d'utilisateur (UE) peut identifier des paramètres associés à une cellule secondaire (SCell) d'une configuration d'agrégation de porteuses et peut sélectionner un mode d'accusé de réception pendant une période de désyntonisation afin de surveiller un réseau différent ou une technologie d'accès radio différente. L'UE peut déterminer si la SCell est programmée à l'aide d'une planification inter-porteuses, si la variance dans les ressources utilisées pour la transmission de canal de commande en liaison montante physique est inférieure à un seuil, si la corrélation de planification entre une cellule primaire (PCell) de la configuration de l'agrégation de porteuses et de la SCell est inférieure à un seuil, et/ou si la longueur de la période de désyntonisation est inférieure à un seuil. Sur la base des paramètres identifiés, l'UE peut, par exemple, transmettre un ou plusieurs faux accusés de réception pour des messages sur la SCell pendant la période de désyntonisation afin de garantir qu'une station de base de desserte ne désactive pas la SCell.
PCT/CN2016/100766 2016-09-29 2016-09-29 Traitement d'accusé de réception de scell pendant un intervalle de désyntonisation WO2018058420A1 (fr)

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CN112584425A (zh) * 2019-09-30 2021-03-30 华为技术有限公司 一种测量能力上报的方法、系统及装置

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CN103220728A (zh) * 2012-01-24 2013-07-24 联发科技股份有限公司 维持通信业务质量的方法及其通信装置
WO2013163312A1 (fr) * 2012-04-24 2013-10-31 Texas Instruments Incorporated Procédé de coordination du fonctionnement d'émetteurs-récepteurs sans fil adjacents sur un seul dispositif
WO2015047846A1 (fr) * 2013-09-30 2015-04-02 Intel IP Corporation Vidéo en diffusion continue basée sur le protocole de commande de transmission (tcp)
WO2015073226A1 (fr) * 2013-11-12 2015-05-21 Qualcomm Incorporated Gestion proactive d'index de classement dans un modem activé en slte pour obtenir un débit accru

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WO2013163312A1 (fr) * 2012-04-24 2013-10-31 Texas Instruments Incorporated Procédé de coordination du fonctionnement d'émetteurs-récepteurs sans fil adjacents sur un seul dispositif
WO2015047846A1 (fr) * 2013-09-30 2015-04-02 Intel IP Corporation Vidéo en diffusion continue basée sur le protocole de commande de transmission (tcp)
WO2015073226A1 (fr) * 2013-11-12 2015-05-21 Qualcomm Incorporated Gestion proactive d'index de classement dans un modem activé en slte pour obtenir un débit accru

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* Cited by examiner, † Cited by third party
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CN112584425A (zh) * 2019-09-30 2021-03-30 华为技术有限公司 一种测量能力上报的方法、系统及装置
CN112584425B (zh) * 2019-09-30 2022-07-12 华为技术有限公司 一种测量能力上报的网络系统、电子设备及芯片系统

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