Method, apparatus and computer readable medium for communicating on an uplink in a shared radio frequency spectrum band

Abstract

Techniques for wireless communications are described. A method includes: detecting a first reference signal received from a user equipment (UE) in a reference scheduled transmission burst including a plurality of consecutive transmission time intervals (TTIs) received over a shared radio frequency spectrum band; identifying a reference TTI in which the first reference signal is received; determining a contention window size that can be used by the UE to contend for access to the shared radio frequency spectrum band; and sending an indication of the determined contention window size to the UE.

Description

[0001] This application is a divisional application of the invention patent application with the application date of July 10, 2017, application number 201780044342.5, and name “Methods, devices and computer-readable media for communicating on an uplink in a shared radio frequency spectrum band”.

[0002] Cross-references

[0003] This patent application claims priority to U.S. Patent Application No. 15 / 608,858, filed by Yerramalli et al. on May 30, 2017, entitled “Techniques For Communicating on an Uplink in a Shared Radio Frequency Spectrum Band,” and U.S. Provisional Patent Application No. 62 / 365,291, filed by Yerramalli et al. on July 21, 2016, entitled “Techniques For Communicating on an Uplink in a Shared Radio Frequency Spectrum Band,” each of which is assigned to the assignee of this application. Technical Field

[0004] The present disclosure relates, for example, to wireless communication systems, and more particularly, to techniques for communicating on an uplink in a shared radio frequency spectrum band. Background Art

[0005] Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, etc. These systems may be multiple-access systems capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power). Examples of such 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.

[0006] By way of example, a wireless multiple-access communication system may include multiple base stations, each of which simultaneously supports communication for multiple communication devices, also referred to as user equipment (UE). The base stations may communicate with the UEs on downlink channels (e.g., for transmissions from the base stations to the UEs) and uplink channels (e.g., for transmissions from the UEs to the base stations).

[0007] Certain communication modes may enable communication between a base station and a UE through a shared RF spectrum band or through different RF spectrum bands (e.g., a dedicated RF spectrum band and a shared RF spectrum band). With increasing data traffic in cellular networks using dedicated RF spectrum bands, offloading at least some data traffic to a shared RF spectrum band may provide an opportunity for mobile network operators (MNOs) (or cellular operators) for enhanced data transmission capacity. Using a shared RF spectrum band may also provide services in areas where access to a dedicated RF spectrum band is not available. Summary of the invention

[0008] Before sending an uplink transmission in a shared radio frequency spectrum band, the UE may contend for access to the shared radio frequency spectrum band by performing a listen before talk (LBT) procedure. The LBT procedure may be performed during a contention window having a contention window size. The contention window size may be adjusted (e.g., increased or decreased) based at least in part on the success or failure of a transmission made to a network access device via the shared radio frequency spectrum band. Techniques for adjusting the contention window size used by the UE based at least in part on a determination made by the UE or a network access device are described in the present disclosure. Techniques for configuring other aspects of uplink transmissions and other aspects of communications via a shared radio frequency spectrum band are also described.

[0009] In one example, a method for wireless communication at a network access device is described. The method may include: detecting a first reference signal received from a UE in a reference scheduled transmission burst including a plurality of consecutive transmission time intervals (TTIs) received over a shared radio frequency spectrum band; identifying a reference TTI in which the first reference signal is received; and determining a contention window size that can be used by the UE to compete for access to the shared radio frequency spectrum band. The determined contention window size may be based at least in part on: triggering of a non-periodic channel state information (CSI) without a physical uplink shared channel (PUSCH) on the reference TTI, decoding of a physical uplink control channel (PUCCH) with a cyclic redundancy check (CRC) scheduled in the reference TTI, decoding of a random access preamble scheduled on a physical random access channel (PRACH) in the reference TTI, decoding of a first scheduled uplink transmission associated with a random access procedure and received in the reference TTI, or a combination thereof. The method may also include: sending an indication of the determined contention window size to the UE.

[0010] In one example, an apparatus for wireless communication at a network access device is described. The apparatus may include: a unit for detecting a first reference signal received from a UE in a reference scheduled transmission burst including multiple consecutive TTIs received over a shared radio frequency spectrum band; a unit for identifying a reference TTI in which the first reference signal is received; and a unit for determining a contention window size that can be used by the UE to compete for access to the shared radio frequency spectrum band. The determined contention window size may be based at least in part on: triggering of non-periodic CSI without PUSCH on the reference TTI, decoding of a PUCCH with CRC scheduled in the reference TTI, decoding of a random access preamble scheduled on a PRACH in the reference TTI, decoding of a first scheduled uplink transmission associated with a random access process and received in the reference TTI, or a combination thereof. The apparatus may also include: a unit for sending an indication of the determined contention window size to the UE.

[0011] In one example, another apparatus for wireless communication at a network access device is described. The apparatus may include: a processor and a memory in electronic communication with the processor. The processor and the memory may be configured to perform the following operations: detecting a first reference signal received from a UE in a reference scheduled transmission burst including a plurality of consecutive TTIs received through a shared radio frequency spectrum band; identifying a reference TTI in which the first reference signal is received; and determining a contention window size that can be used by the UE to compete for access to the shared radio frequency spectrum band. The determined contention window size may be based at least in part on: triggering of a non-periodic CSI without PUSCH on the reference TTI, decoding of a PUCCH with CRC scheduled in the reference TTI, decoding of a random access preamble scheduled on a PRACH in the reference TTI, decoding of a first scheduled uplink transmission associated with a random access process and received in the reference TTI, or a combination thereof. The processor and the memory may also be configured to send an indication of the determined contention window size to the UE.

[0012] In one example, a non-transitory computer-readable medium storing computer executable code for wireless communication at a network access device is described. The code may be executable by a processor to perform the following operations: detecting a first reference signal received from a UE in a reference scheduled transmission burst including multiple consecutive TTIs received through a shared radio frequency spectrum band; identifying the reference TTI in which the first reference signal is received; and determining a contention window size that can be used by the UE to compete for access to the shared radio frequency spectrum band. The determined contention window size may be based at least in part on the following: triggering of non-periodic CSI without PUSCH on the reference TTI, decoding of PUCCH with CRC scheduled in the reference TTI, decoding of a random access preamble code scheduled on PRACH in the reference TTI, decoding of a first scheduled uplink transmission associated with a random access process and received in the reference TTI, or a combination thereof. The code may also be executable by the processor to send an indication of the determined contention window size to the UE.

[0013] In one example, a method for wireless communication at a UE is described. The method may include receiving at least one uplink grant for a reference scheduled transmission burst including a plurality of consecutive TTIs transmitted over a shared radio frequency spectrum band. At least a first uplink grant of the plurality of uplink grants may include a first indication that the first uplink grant is associated with a first scheduled TTI of the reference scheduled transmission burst, a second indication of the position of the first scheduled TTI within the reference scheduled transmission burst, or a combination thereof. The method may also include transmitting during at least one TTI of the reference scheduled transmission burst according to the at least one uplink grant. The transmission may start during the first transmission TTI. The method may also include receiving an indication of a reference TTI that is used for transmission during the reference scheduled transmission burst; and determining a contention window size that may be used by the UE to compete for access to the shared radio frequency spectrum band. The contention window size may be determined based at least in part on the relationship between the first scheduled TTI, the reference TTI, and the first transmission TTI. In some cases, the relationship may include that the first transmission TTI is earlier than the reference TTI, the first transmission TTI is later than the reference TTI, or the first transmission TTI is the same as the reference TTI.

[0014] In some examples of the method, each uplink grant for the reference scheduled transmission burst may include an indication of the position of the first scheduled TTI of the reference scheduled transmission burst. In some examples, the indication of the reference TTI is relative to the first scheduled TTI.

[0015] In one example, an apparatus for wireless communication at a UE is described. The apparatus may include: a unit for receiving at least one uplink grant for a reference scheduled transmission burst including a plurality of consecutive TTIs transmitted over a shared radio frequency spectrum band. At least a first uplink grant of the plurality of uplink grants may include: a first indication that the first uplink grant is associated with a first scheduled TTI of the reference scheduled transmission burst, a second indication of the position of the first scheduled TTI within the reference scheduled transmission burst, or a combination thereof. The apparatus may also include: a unit for transmitting during at least one TTI of the reference scheduled transmission burst according to the at least one uplink grant. The transmission may start during a first transmission TTI. The apparatus may also include: a unit for receiving an indication of a reference TTI used for transmission during the reference scheduled transmission burst; and a unit for determining a contention window size that may be used by the UE to contend for access to the shared radio frequency spectrum band. The contention window size may be determined based at least in part on the relationship between the first scheduled TTI, the reference TTI, and the first transmission TTI. In some cases, the relationship may include that the first transmission TTI is earlier than the reference TTI, the first transmission TTI is later than the reference TTI, or the first transmission TTI is the same as the reference TTI.

[0016] In one example, another apparatus for wireless communication at a UE is described. The apparatus may include: a processor and a memory in electronic communication with the processor. The processor and the memory may be configured to receive at least one uplink grant for a reference scheduled transmission burst including a plurality of consecutive TTIs transmitted through a shared radio frequency spectrum band. At least a first uplink grant of the plurality of uplink grants may include: a first indication that the first uplink grant is associated with a first scheduled TTI of the reference scheduled transmission burst, a second indication of the position of the first scheduled TTI within the reference scheduled transmission burst, or a combination thereof. The processor and the memory may also be configured to transmit during at least one TTI of the reference scheduled transmission burst according to the at least one uplink grant. The transmission may start during the first transmission TTI. The processor and the memory may also be configured to perform the following operations: receiving an indication of a reference TTI, the reference TTI being used for transmission during the reference scheduled transmission burst; and determining a contention window size that may be used by the UE to compete for access to the shared radio frequency spectrum band. The contention window size may be determined based at least in part on the relationship between the first scheduled TTI, the reference TTI, and the first transmission TTI. In some cases, the relationship may include that the first transmission TTI is earlier than the reference TTI, the first transmission TTI is later than the reference TTI, or the first transmission TTI is the same as the reference TTI.

[0017] In one example, a non-transitory computer-readable medium storing computer executable code for wireless communication at a UE is described. The code may be executable by a processor to receive at least one uplink grant for a reference scheduled transmission burst including multiple consecutive TTIs transmitted through a shared radio frequency spectrum band. At least the first uplink grant of the multiple uplink grants may include: a first indication that the first uplink grant is associated with the first scheduled TTI of the reference scheduled transmission burst, a second indication of the position of the first scheduled TTI within the reference scheduled transmission burst, or a combination thereof. The code may also be executable by the processor to transmit during at least one TTI of the reference scheduled transmission burst according to the at least one uplink grant. The transmission may start during the first transmission TTI. The code may also be executable by the processor to perform the following operations: receiving an indication of a reference TTI, the reference TTI being used for transmission during the reference scheduled transmission burst; and determining a contention window size that can be used by the UE to compete for access to the shared radio frequency spectrum band. The contention window size may be determined based at least in part on the relationship between the first scheduled TTI, the reference TTI, and the first transmission TTI. In some cases, the relationship may include that the first transmission TTI is earlier than the reference TTI, the first transmission TTI is later than the reference TTI, or the first transmission TTI is the same as the reference TTI.

[0018] In one example, another method for wireless communication at a UE is described. The method may include: sending a reference scheduled transmission burst including multiple consecutive TTIs over a shared radio frequency spectrum band; and identifying a hybrid automatic repeat request (HARQ) process corresponding to the reference TTI. The reference TTI may be the first TTI for which a HARQ confirmation is received in the multiple consecutive TTIs. The method may also include: identifying an instance of the HARQ process associated with a TTI after the reference TTI. The instance of the HARQ process may be identified at least in part based on: whether the TTI is in the reference scheduled transmission burst or a subsequent transmission burst, whether the TTI includes non-periodic CSI without PUSCH, or a combination thereof. The method may also include: determining a contention window size used to compete for access to the shared radio frequency spectrum band, wherein the determination is based at least in part on a state of a new data indicator (NDI) associated with the identified instance of the HARQ process.

[0019] In one example, another apparatus for wireless communication at a UE is described. The apparatus may include: a unit for sending a reference scheduled transmission burst including multiple consecutive TTIs over a shared radio frequency spectrum band; and a unit for identifying a HARQ process corresponding to the reference TTI. The reference TTI may be the first TTI for which a HARQ confirmation is received in the multiple consecutive TTIs. The apparatus may also include: a unit for identifying an instance of the HARQ process associated with a TTI after the reference TTI. The instance of the HARQ process may be identified at least in part based on: whether the TTI is in the reference scheduled transmission burst or a subsequent transmission burst, whether the TTI includes non-periodic CSI without PUSCH, or a combination thereof. The apparatus may also include: a unit for determining a contention window size used to compete for access to the shared radio frequency spectrum band, wherein the determination is based at least in part on the state of the NDI associated with the identified instance of the HARQ process.

[0020] In one example, another apparatus for wireless communication at a UE is described. The apparatus may include: a processor and a memory in electronic communication with the processor. The processor and the memory may be configured to perform the following operations: sending a reference scheduled transmission burst including multiple consecutive TTIs through a shared radio frequency spectrum band; and identifying a HARQ process corresponding to the reference TTI. The reference TTI may be the first TTI for which a HARQ confirmation is received in the multiple consecutive TTIs. The processor and the memory may also be configured to identify an instance of the HARQ process associated with a TTI after the reference TTI. The instance of the HARQ process may be identified at least in part based on whether the TTI is in the reference scheduled transmission burst or a subsequent transmission burst, whether the TTI includes non-periodic CSI without PUSCH, or a combination thereof. The processor and the memory may also be configured to determine a contention window size used to compete for access to the shared radio frequency spectrum band, wherein the determination is based at least in part on the state of the NDI associated with the identified instance of the HARQ process.

[0021] In one example, another non-transitory computer-readable medium storing computer-executable code for wireless communication at a UE is described. The code may be executable by a processor to perform the following operations: sending a reference scheduled transmission burst including multiple consecutive TTIs over a shared radio frequency spectrum band; and identifying a HARQ process corresponding to the reference TTI. The reference TTI may be the first TTI for which a HARQ confirmation is received in the multiple consecutive TTIs. The code may also be executable by the processor to identify an instance of the HARQ process associated with a TTI after the reference TTI. The instance of the HARQ process may be identified at least in part based on whether the TTI is in the reference scheduled transmission burst or a subsequent transmission burst, whether the TTI includes non-periodic CSI without PUSCH, or a combination thereof. The code may also be executable by the processor to determine a contention window size used to contend for access to the shared radio frequency spectrum band, the determination being based at least in part on the state of the NDI associated with the identified instance of the HARQ process.

[0022] In one example, another method for wireless communication at a UE is described. The method may include: receiving in a common physical downlink control channel (CPDCCH) a first indication of a remaining channel occupancy time (RCOT) within which a network access device can access a shared radio frequency spectrum band and a second indication of a pause time during which the network access device will not transmit through the shared radio frequency spectrum band. The method may also include: determining, at least in part based on the RCOT, whether the size of the UE's uplink transmission allows the UE to send the uplink transmission within a maximum channel occupancy time (MCOT) within which the network access device can access the shared radio frequency spectrum band; and entering a power saving mode during at least a portion of the pause time.

[0023] In some examples of the method, the RCOT may include the pause time. In some examples, the RCOT may not include the pause time.

[0024] In one example, another apparatus for wireless communication at a UE is described. The apparatus may include: a unit for receiving in a CPDCCH a first indication of a RCOT within which a network access device can access a shared radio frequency spectrum band and a second indication of a pause time during which the network access device will not transmit through the shared radio frequency spectrum band. The apparatus may also include: a unit for determining, at least in part based on the RCOT, whether the size of the UE's uplink transmission allows the UE to send the uplink transmission within the MCOT within which the network access device can access the shared radio frequency spectrum band; and a unit for entering a power saving mode during at least a portion of the pause time.

[0025] In one example, another apparatus for wireless communication at a UE is described. The apparatus may include: a processor and a memory in electronic communication with the processor. The processor and the memory may be configured to receive in a CPDCCH a first indication of a RCOT within which a network access device can access a shared radio frequency spectrum band and a second indication of a pause time during which the network access device will not transmit through the shared radio frequency spectrum band. The processor and the memory may also be configured to perform the following operations: determine, at least in part based on the RCOT, whether the size of the UE's uplink transmission allows the UE to send the uplink transmission within the MCOT within which the network access device can access the shared radio frequency spectrum band; and enter a power saving mode during at least a portion of the pause time.

[0026] In one example, another non-transitory computer-readable medium storing computer-executable code for wireless communication at a UE is described. The code may be executable by a processor to receive in a CPDCCH a first indication of a RCOT within which a network access device can access a shared radio frequency spectrum band and a second indication of a pause time during which the network access device will not transmit through the shared radio frequency spectrum band. The code may also be executable by the processor to perform the following operations: determine, at least in part based on the RCOT, whether the size of the UE's uplink transmission allows the UE to send the uplink transmission within the MCOT within which the network access device can access the shared radio frequency spectrum band; and enter a power saving mode during at least a portion of the pause time.

[0027] In one example, another method for wireless communication at a UE is described. The method may include: receiving an indication of a downlink-uplink TTI configuration starting with the downlink TTI in a scheduled transmission burst received over a shared radio frequency spectrum band; and determining a timing of a next downlink TTI in the scheduled transmission burst based at least in part on the downlink-uplink TTI configuration starting with the downlink TTI. In some cases, the downlink-uplink configuration may include multiple upcoming downlink TTIs, multiple uplink TTIs, or a combination thereof.

[0028] In some examples, the method may include receiving, in each of at least one additional downlink TTI of the scheduled transmission burst, an additional indication of an additional downlink-uplink TTI configuration following the additional downlink TTI. In some examples, the method may include receiving, in the downlink TTI, at least one of: a second indication of a downlink TTI duration, a third indication of an uplink TTI duration, or a combination thereof. In some examples, the downlink TTI may include a downlink subframe, and the downlink-uplink TTI configuration may include a downlink-uplink subframe configuration.

[0029] In one example, another apparatus for wireless communication at a UE is described. The apparatus may include: a unit for receiving an indication of a downlink-uplink TTI configuration starting with the downlink TTI in a scheduled transmission burst received over a shared radio frequency spectrum band; and a unit for determining the timing of a next downlink TTI in the scheduled transmission burst based at least in part on the downlink-uplink TTI configuration starting with the downlink TTI. In some cases, the downlink-uplink configuration may include multiple upcoming downlink TTIs, multiple uplink TTIs, or a combination thereof.

[0030] In one example, another apparatus for wireless communication at a UE is described. The apparatus may include: a processor and a memory in electronic communication with the processor. The processor and the memory may be configured to perform the following operations: receiving an indication of a downlink-uplink TTI configuration starting with the downlink TTI in a scheduled transmission burst received through a shared radio frequency spectrum band; and determining the timing of the next downlink TTI in the scheduled transmission burst based at least in part on the downlink-uplink TTI configuration starting with the downlink TTI. In some cases, the downlink-uplink configuration may include multiple upcoming downlink TTIs, multiple uplink TTIs, or a combination thereof.

[0031] In one example, another non-transitory computer-readable medium storing computer executable code for wireless communication at a UE is described. The code may be executable by a processor to perform wireless communication at the UE, and the code may be executable by the processor to perform the following operations: receiving an indication of a downlink-uplink TTI configuration starting with the downlink TTI in a scheduled transmission burst received through a shared radio frequency spectrum band; and determining the timing of the next downlink TTI in the scheduled transmission burst based at least in part on the downlink-uplink TTI configuration starting with the downlink TTI. In some cases, the downlink-uplink configuration may include multiple upcoming downlink TTIs, multiple uplink TTIs, or a combination thereof.

[0032] In one example, another method for wireless communication at a UE is described. The method may include: sending a buffer status report (BSR); receiving an indicator of an LBT priority level boundary from a network access device in response to sending the BSR; selecting an LBT priority level based at least in part on a type of data to be sent over a shared radio frequency spectrum band and the LBT priority level boundary; and contending for access to the shared radio frequency spectrum band based at least in part on the selected LBT priority level.

[0033] In certain examples of the method, the LBT priority level boundary includes at least one of: a highest LBT priority level that can be used by the UE, a lowest LBT priority level that can be used by the UE, or a combination thereof.

[0034] In one example, another apparatus for wireless communication at a UE is described. The apparatus may include: a unit for sending a BSR; a unit for receiving an indicator of an LBT priority level boundary from a network access device in response to sending the BSR; a unit for selecting an LBT priority level based at least in part on the type of data to be sent through a shared radio frequency spectrum band and the lowest LBT priority level boundary; and a unit for competing for access to the shared radio frequency spectrum band based at least in part on the selected LBT priority level.

[0035] In one example, another apparatus for wireless communication at a UE is described. The apparatus may include: a processor and a memory in electronic communication with the processor. The processor and the memory may be configured to perform the following operations: sending a BSR; receiving an indicator of an LBT priority level boundary from a network access device in response to sending the BSR; selecting an LBT priority level based at least in part on the type of data to be sent through a shared radio frequency spectrum band and a lowest LBT priority level boundary; and competing for access to the shared radio frequency spectrum band based at least in part on the selected LBT priority level.

[0036] In one example, another non-transitory computer-readable medium storing computer-executable code for wireless communication at a UE is described. The code may be executable by a processor to perform the following operations: sending a BSR; receiving an indicator of an LBT priority level boundary from a network access device in response to sending the BSR; selecting an LBT priority level based at least in part on the type of data to be sent over a shared radio frequency spectrum band and a lowest LBT priority level boundary; and contending for access to the shared radio frequency spectrum band based at least in part on the selected LBT priority level.

[0037] In one example, another method for wireless communication at a UE is described. The method may include: sending a first type of BSR, the first type of BSR including an indication of an amount of data to be sent for each of a plurality of LBT priority levels; and receiving, in response to sending the first BSR, from a network access device an indication of an LBT priority level to be used by the UE when contending for access to a shared radio frequency spectrum band.

[0038] In some examples, the method may include: selecting the first type of BSR from a plurality of BSR types including at least the first type of BSR and a second type of BSR. In some examples, the second type of BSR may include a Long Term Evolution (LTE) / Advanced LTE (LTE-A) type of BSR. In some examples, the first type of BSR may be selected based at least in part on a BSR selection criterion. In some examples, the BSR selection criterion may include receiving data to be transmitted, wherein the data is associated with an LBT priority level that satisfies a threshold LBT priority level.

[0039] In one example, another apparatus for wireless communication at a UE is described. The apparatus may include: a unit for sending a first type of BSR, the first type of BSR including an indication of an amount of data to be sent for each of a plurality of LBT priority levels; and a unit for receiving, in response to sending the first type of BSR, an indication of an LBT priority level to be used by the UE when contending for access to a shared radio frequency spectrum band from a network access device.

[0040] In one example, another apparatus for wireless communication at a UE is described. The apparatus may include: a processor and a memory in electronic communication with the processor. The processor and the memory may be configured to perform the following operations: sending a first type of BSR, the first type of BSR including an indication of the amount of data to be sent for each of a plurality of LBT priority levels; and receiving, in response to sending the first type of BSR, an indication of the LBT priority level to be used by the UE when competing for access to a shared radio frequency spectrum band from a network access device.

[0041] In one example, another non-transitory computer-readable medium storing computer-executable code for wireless communication at a UE is described. The code may be executable by a processor to perform the following operations: sending a first type of BSR, the first type of BSR including an indication of an amount of data to be sent for each of a plurality of LBT priority levels; and receiving an indication of an LBT priority level to be used by the UE when contending for access to a shared radio frequency spectrum band from a network access device in response to sending the first type of BSR.

[0042] In one example, another method for wireless communication at a UE is described. The method may include: receiving a first uplink grant for transmission through a shared radio frequency spectrum band, wherein the first uplink grant is associated with a first LBT priority level; performing a first LBT process based at least in part on the first LBT priority level to contend for access to the shared radio frequency spectrum band, wherein the first LBT process ends at an LBT state; determining not to transmit through the shared radio frequency spectrum band according to the first uplink grant based at least in part on the LBT state; receiving a second uplink grant for transmission through the shared radio frequency spectrum band, wherein the second uplink grant is associated with a second LBT priority level; and performing a second LBT process based at least in part on the second LBT priority level, the first LBT priority level, and the LBT state to contend for access to the shared radio frequency spectrum band.

[0043] In some examples, the method may include: determining that the first LBT priority level and the second LBT priority level are the same LBT priority level; and initializing the second LBT process based at least in part on the LBT state. In some examples, the method may include: determining that the first LBT priority level and the second LBT priority level are different LBT priority levels; adjusting the LBT state based at least in part on a difference between the first LBT priority level and the second LBT priority level; and initializing the second LBT process based at least in part on the adjusted LBT state.

[0044] In one example, another apparatus for wireless communication at a UE is described. The apparatus may include: a unit for receiving a first uplink grant for transmission through a shared radio frequency spectrum band, wherein the first uplink grant is associated with a first LBT priority level; a unit for performing a first LBT process to contend for access to the shared radio frequency spectrum band based at least in part on the first LBT priority level, wherein the first LBT process ends at an LBT state; a unit for determining not to transmit through the shared radio frequency spectrum band based at least in part on the LBT state according to the first uplink grant; a unit for receiving a second uplink grant for transmission through the shared radio frequency spectrum band, wherein the second uplink grant is associated with a second LBT priority level; and a unit for performing a second LBT process to contend for access to the shared radio frequency spectrum band based at least in part on the second LBT priority level, the first LBT priority level, and the LBT state.

[0045] In one example, another apparatus for wireless communication at a UE is described. The apparatus may include: a processor and a memory in electronic communication with the processor. The processor and the memory may be configured to perform the following operations: receiving a first uplink grant for transmission through a shared radio frequency spectrum band, wherein the first uplink grant is associated with a first LBT priority level; performing a first LBT process based at least in part on the first LBT priority level to compete for access to the shared radio frequency spectrum band, wherein the first LBT process ends at an LBT state; determining at least in part based on the LBT state not to transmit through the shared radio frequency spectrum band according to the first uplink grant; receiving a second uplink grant for transmission through the shared radio frequency spectrum band, wherein the second uplink grant is associated with a second LBT priority level; and performing a second LBT process based at least in part on the second LBT priority level, the first LBT priority level, and the LBT state to compete for access to the shared radio frequency spectrum band.

[0046] In one example, another non-transitory computer-readable medium storing computer executable code for wireless communication at a UE is described. The code may be executable by a processor to perform the following operations: receiving a first uplink grant for transmission through a shared radio frequency spectrum band, wherein the first uplink grant is associated with a first LBT priority level; performing a first LBT process based at least in part on the first LBT priority level to contend for access to the shared radio frequency spectrum band, wherein the first LBT process ends at an LBT state; determining not to transmit through the shared radio frequency spectrum band based on the first uplink grant based at least in part on the LBT state; receiving a second uplink grant for transmission through the shared radio frequency spectrum band, wherein the second uplink grant is associated with a second LBT priority level; and performing a second LBT process based at least in part on the second LBT priority level, the first LBT priority level, and the LBT state to contend for access to the shared radio frequency spectrum band.

[0047] In one example, another method for wireless communication at a network access device is described. The method may include: identifying feedback received from a UE for a downlink reference TTI for a transmission opportunity (TxOP) through a shared radio frequency spectrum band, wherein the TxOP may include at least one downlink TTI and at least one uplink TTI; identifying an uplink TTI of the TxOP for which scheduling information is sent in the downlink reference TTI; and determining, based at least in part on the identified feedback and the scheduled uplink transmission in the identified uplink TTI, a contention window size that may be used by the network access device to contend for access to the shared radio frequency spectrum band for a next TxOP.

[0048] In some examples, determining the contention window size based at least in part on the scheduled uplink transmission in the identified uplink TTI may include: determining the contention window size based at least in part on decoding of at least one channel including: scheduled PUSCH or scheduled PUCCH or scheduled PRACH or a combination thereof. In some examples, determining the contention window size based at least in part on the decoding of the at least one channel may include: determining the contention window size based at least in part on acknowledgement / negative acknowledgement (ACK / NACK) feedback for the at least one channel. In some examples, the at least one downlink TTI may include at least one downlink subframe, and the at least one uplink TTI may include at least one uplink subframe.

[0049] In one example, another apparatus for wireless communication at a network access device is described. The apparatus may include: a unit for identifying feedback received from a UE for a downlink reference TTI for a TxOP over a shared radio frequency spectrum band, wherein the TxOP may include at least one downlink TTI and at least one uplink TTI; a unit for identifying an uplink TTI of the TxOP for which scheduling information is sent in the downlink reference TTI; and a unit for determining, based at least in part on the identified feedback and the scheduled uplink transmission in the identified uplink TTI, a contention window size that may be used by the network access device for competing for access to the shared radio frequency spectrum band for a next TxOP.

[0050] In one example, another apparatus for wireless communication at a network access device is described. The apparatus may include: a processor and a memory in electronic communication with the processor. The processor and the memory may be configured to perform the following operations: identifying feedback received from a UE for a downlink reference TTI for a TxOP over a shared radio frequency spectrum band, wherein the TxOP may include at least one downlink TTI and at least one uplink TTI; identifying an uplink TTI for the TxOP for which scheduling information is sent in the downlink reference TTI; and determining, based at least in part on the identified feedback and the scheduled uplink transmission in the identified uplink TTI, for a next TxOP, a contention window size that may be used by the network access device to compete for access to the shared radio frequency spectrum band.

[0051] In one example, another non-transitory computer-readable medium storing computer executable code for wireless communication at a network access device is described. The code may be executable by a processor to perform the following operations: identifying feedback received from a UE for a downlink reference TTI for a TxOP over a shared radio frequency spectrum band, wherein the TxOP may include at least one downlink TTI and at least one uplink TTI; identifying an uplink TTI for the TxOP for which scheduling information is sent in the downlink reference TTI; and determining, based at least in part on the identified feedback and the scheduled uplink transmission in the identified uplink TTI, for a next TxOP, a contention window size that may be used by the network access device to contend for access to the shared radio frequency spectrum band.

[0052] In one example, another method for wireless communication at a UE is described. The method may include: receiving scheduling information for uplink transmissions to be made over multiple carriers of a shared radio frequency spectrum band; identifying a carrier among the multiple carriers on which a first type of LBT process is to be performed; performing the first type of LBT process for the identified carrier; performing a second type of LBT process for each carrier among the multiple carriers other than the identified carrier; and sending the uplink transmission over the multiple carriers based at least in part on performing the first type of LBT process for the identified carrier and performing the second type of LBT process for each carrier other than the identified carrier. The second type of LBT process may have a shorter contention window than the first type of LBT process.

[0053] In some examples of the method, identifying the carrier may include one of: identifying the carrier according to an indication received from a network access device or independently identifying the carrier.

[0054] In one example, another apparatus for wireless communication at a UE is described. The apparatus may include: a unit for receiving scheduling information for uplink transmissions to be made over multiple carriers of a shared radio frequency spectrum band; a unit for identifying a carrier among the multiple carriers on which a first type of LBT process is to be performed; a unit for performing the first type of LBT process for the identified carrier; a unit for performing a second type of LBT process for each carrier among the multiple carriers other than the identified carrier; and a unit for sending the uplink transmission over the multiple carriers based at least in part on performing the first type of LBT process for the identified carrier and performing the second type of LBT process for each carrier other than the identified carrier. The second type of LBT process may have a shorter contention window than the first type of LBT process.

[0055] In one example, another apparatus for wireless communication at a UE is described. The apparatus may include: a processor and a memory in electronic communication with the processor. The processor and the memory may be configured to perform the following operations: receiving scheduling information for uplink transmissions to be made through multiple carriers of a shared radio frequency spectrum band; identifying a carrier among the multiple carriers on which a first type of LBT process is to be performed; performing the first type of LBT process for the identified carrier; performing a second type of LBT process for each carrier among the multiple carriers that is different from the identified carrier; and sending the uplink transmission through the multiple carriers based at least in part on performing the first type of LBT process for the identified carrier and performing the second type of LBT process for each carrier that is different from the identified carrier. The second type of LBT process may have a shorter contention window than the first type of LBT process.

[0056] In one example, another non-transitory computer-readable medium storing computer-executable code for wireless communication at a UE is described. The code may be executable by a processor to perform the following operations: receiving scheduling information for uplink transmissions to be made over multiple carriers of a shared radio frequency spectrum band; identifying a carrier among the multiple carriers on which a first type of LBT process is to be performed; performing the first type of LBT process for the identified carrier; performing a second type of LBT process for each carrier among the multiple carriers other than the identified carrier; and sending the uplink transmission over the multiple carriers based at least in part on performing the first type of LBT process for the identified carrier and performing the second type of LBT process for each carrier other than the identified carrier. The second type of LBT process may have a shorter contention window than the first type of LBT process.

[0057] In one example, another method for wireless communication at a network access device is described. The method may include: scheduling uplink transmissions to be made by a UE over multiple carriers of a shared radio frequency spectrum band; and sending an indication to the UE of a single carrier of the multiple carriers for which a first type of LBT process is to be performed.

[0058] In some examples, sending the indication of the single carrier may include sending the indication of the single carrier in uplink downlink control information (DCI) of the single carrier, or sending the indication of the single carrier in uplink DCI of each of the multiple carriers.

[0059] In one example, another apparatus for wireless communication at a network access device is described. The apparatus may include: a unit for scheduling uplink transmissions to be made by a UE over multiple carriers of a shared radio frequency spectrum band; and a unit for sending an indication to the UE of a single carrier of the multiple carriers for which a first type of LBT process is to be performed.

[0060] In one example, another apparatus for wireless communication at a network access device is described. The apparatus may include: a processor and a memory in electronic communication with the processor. The processor and the memory may be configured to perform the following operations: scheduling uplink transmissions to be made by a UE over multiple carriers sharing a radio frequency spectrum band; and sending an indication to the UE of a single carrier of the multiple carriers for which a first type of LBT process is to be performed.

[0061] In one example, another non-transitory computer-readable medium storing computer-executable code for wireless communication at a network access device is described. The code may be executable by a processor to perform the following operations: scheduling uplink transmissions to be made by a UE over multiple carriers sharing a radio frequency spectrum band; and sending an indication to the UE of a single carrier of the multiple carriers for which a first type of LBT procedure is to be performed.

[0062] In one example, another method for wireless communication at a UE is described. The method may include: identifying a type of LBT process to be performed to compete for access to a shared radio frequency spectrum band. The identified type of LBT process may include a first type of LBT process or a second type of LBT process. The method may also include: identifying an energy detection threshold associated with the identified type of LBT process. The identified energy detection threshold may include a first energy detection threshold for the first type of LBT process or a second energy detection threshold for the second type of LBT process. The first energy detection threshold may be lower than the second energy detection threshold. The method may also include: performing the identified type of LBT process to compete for access to the shared radio frequency spectrum band based at least in part on the identified energy detection threshold.

[0063] In one example, another apparatus for wireless communication at a UE is described. The apparatus may include: a unit for identifying a type of LBT process to be performed to compete for access to a shared radio frequency spectrum band. The identified type of LBT process may include a first type of LBT process or a second type of LBT process. The apparatus may also include: a unit for identifying an energy detection threshold associated with the identified type of LBT process. The identified energy detection threshold may include a first energy detection threshold for the first type of LBT process or a second energy detection threshold for the second type of LBT process. The first energy detection threshold may be lower than the second energy detection threshold. The apparatus may also include: a unit for performing the identified type of LBT process to compete for access to the shared radio frequency spectrum band based at least in part on the identified energy detection threshold.

[0064] In one example, another apparatus for wireless communication at a UE is described. The apparatus may include: a processor and a memory in electronic communication with the processor. The processor and the memory may be configured to identify a type of LBT process to be performed to compete for access to a shared radio frequency spectrum band. The identified type of LBT process may include a first type of LBT process or a second type of LBT process. The processor and the memory may be configured to identify an energy detection threshold associated with the identified type of LBT process. The identified energy detection threshold may include a first energy detection threshold for the first type of LBT process or a second energy detection threshold for the second type of LBT process. The first energy detection threshold may be lower than the second energy detection threshold. The processor and the memory may be configured to perform the identified type of LBT process to compete for access to the shared radio frequency spectrum band based at least in part on the identified energy detection threshold.

[0065] In one example, another non-transitory computer-readable medium storing computer-executable code for wireless communication at a UE is described. The code may be executable by a processor to identify a type of LBT process to be performed to compete for access to a shared radio frequency spectrum band. The identified type of LBT process may include a first type of LBT process or a second type of LBT process. The code may also be executable by the processor to identify an energy detection threshold associated with the identified type of LBT process. The identified energy detection threshold may include a first energy detection threshold for the first type of LBT process or a second energy detection threshold for the second type of LBT process. The first energy detection threshold may be lower than the second energy detection threshold. The code may also be executable by the processor to perform the identified type of LBT process to compete for access to the shared radio frequency spectrum band based at least in part on the identified energy detection threshold.

[0066] In one example, another method for wireless communication at a UE is described. The method may include: receiving an indication that the UE may not update a countdown counter associated with performing an LBT procedure during a TTI in which the UE receives a transmission; determining that the UE is receiving a transmission during the TTI; and avoiding at least one of: performing an LBT procedure during the TTI, updating the countdown counter associated with performing the LBT procedure during the TTI, or a combination thereof.

[0067] In some examples of the method, the indication that the UE may not update the countdown counter may be received in at least one of: radio resource control (RRC) signaling, system information block (SIB), or DCI.

[0068] In one example, another apparatus for wireless communication at a UE is described. The apparatus may include: a unit for receiving an indication that the UE may not update a countdown counter associated with performing an LBT procedure during a TTI in which the UE receives a transmission; a unit for determining that the UE is receiving a transmission during the TTI; and a unit for avoiding at least one of: performing an LBT procedure during the TTI, updating the countdown counter associated with performing the LBT procedure during the TTI, or a combination thereof.

[0069] In one example, another apparatus for wireless communication at a UE is described. The apparatus may include: a processor and a memory in electronic communication with the processor. The processor and the memory may be configured to perform the following operations: receiving an indication that the UE may not update a countdown counter associated with performing an LBT procedure during a TTI in which the UE receives a transmission; determining that the UE is receiving a transmission during the TTI; and avoiding at least one of: performing an LBT procedure during the TTI, updating the countdown counter associated with performing the LBT procedure during the TTI, or a combination thereof.

[0070] In one example, another non-transitory computer-readable medium storing computer-executable code for wireless communication at a UE is described. The code may be executable by a processor to perform the following operations: receiving an indication that the UE may not update a countdown counter associated with performing an LBT procedure during a TTI in which the UE receives a transmission; determining that the UE is receiving a transmission during the TTI; and avoiding at least one of the following: performing an LBT procedure during the TTI, updating the countdown counter associated with performing the LBT procedure during the TTI, or a combination thereof.

[0071] In one example, another method for wireless communication at a UE is described. The method may include: receiving an indication of transmission parameters of an uplink transmission to be made over a shared radio frequency spectrum band during at least one TTI; identifying content of the uplink transmission in each of the at least one TTI; and scaling the transmission parameters of at least the first TTI based at least in part on the identified content of the uplink transmission in the first TTI.

[0072] In some examples of the method, the identified content may include at least one of: a plurality of resource elements (REs), a plurality of punctured symbol periods, a first occurrence of a PUCCH, a second occurrence of a PRACH, a third occurrence of a sounding reference signal (SRS), or a combination thereof. In some examples, the transmission parameter may include at least one of: a transport block size (TBS), a modulation and coding scheme (MCS), or a combination thereof. In some examples, scaling the transmission parameter may include one of: switching to a fixed alternative transmission parameter, or calculating an alternative transmission parameter based at least in part on comparing the identified content to a nominal content.

[0073] In one example, another apparatus for wireless communication at a UE is described. The apparatus may include: a unit for receiving an indication of transmission parameters of an uplink transmission to be made over a shared radio frequency spectrum band during at least one TTI; a unit for identifying content of the uplink transmission in each of the at least one TTI; and a unit for scaling the transmission parameters of at least the first TTI based at least in part on the identified content of the uplink transmission in the first TTI.

[0074] In one example, another apparatus for wireless communication at a UE is described. The apparatus may include: a processor and a memory in electronic communication with the processor. The processor and the memory may be configured to perform the following operations: receive an indication of transmission parameters of an uplink transmission to be made over a shared radio frequency spectrum band during at least one TTI; identify the content of the uplink transmission in each of the at least one TTI; and scale the transmission parameters of at least the first TTI based at least in part on the identified content of the uplink transmission in the first TTI.

[0075] In one example, another non-transitory computer-readable medium storing computer-executable code for wireless communication at a UE is described. The code may be executable by a processor to perform the following operations: receiving an indication of transmission parameters of an uplink transmission to be made over a shared radio frequency spectrum band during at least one TTI; identifying content of the uplink transmission in each of the at least one TTI; and scaling the transmission parameters of at least the first TTI based at least in part on the identified content of the uplink transmission in the first TTI.

[0076] In one example, another method for wireless communication at a UE is described. The method may include: receiving RRC signaling from a network. The RRC signaling may configure a HARQ ACK feedback report for a first carrier in a shared radio frequency spectrum band in one of the following modes: a first mode in which the UE sends HARQ ACK feedback on a PUCCH on a second carrier in a dedicated radio frequency spectrum band, or a second mode in which the UE chooses to send HARQ ACK feedback on a PUCCH on the second carrier or a PUSCH on the first carrier. The method may also include: sending HARQ ACK feedback according to the first mode or the second mode as configured by the RRC signaling.

[0077] In certain examples of the method, the RRC signaling may configure the HARQ ACK feedback report of the first carrier according to the second mode, and the method may also include: competing for access to the first carrier in the shared radio frequency spectrum band; and sending HARQ ACK feedback on the PUSCH on the first carrier based at least in part on winning the competition for access to the first carrier.

[0078] In one example, another apparatus for wireless communication at a UE is described. The apparatus may include: a unit for receiving RRC signaling from a network. The RRC signaling may configure a HARQ ACK feedback report for a first carrier in a shared radio frequency spectrum band in one of the following modes: a first mode in which the UE sends HARQ ACK feedback on a PUCCH on a second carrier in a dedicated radio frequency spectrum band, or a second mode in which the UE chooses to send HARQ ACK feedback on a PUCCH on the second carrier or a PUSCH on the first carrier. The apparatus may also include: a unit for sending HARQ ACK feedback according to the first mode or the second mode as configured by the RRC signaling.

[0079] In one example, another apparatus for wireless communication at a UE is described. The apparatus may include: a processor and a memory in electronic communication with the processor. The processor and the memory may be configured to receive RRC signaling from a network. The RRC signaling may configure a HARQ ACK feedback report for a first carrier in a shared radio frequency spectrum band in one of the following modes: a first mode in which the UE sends HARQ ACK feedback on a PUCCH on a second carrier in a dedicated radio frequency spectrum band, or a second mode in which the UE chooses to send HARQ ACK feedback on a PUCCH on the second carrier or a PUSCH on the first carrier. The processor and the memory may also be configured to send HARQ ACK feedback according to the first mode or the second mode as configured by the RRC signaling.

[0080] In one example, another non-transitory computer-readable medium storing computer-executable code for wireless communication at a UE is described. The code may be executable by a processor to receive RRC signaling from a network. The RRC signaling may configure a HARQ ACK feedback report for a first carrier in a shared radio frequency spectrum band in one of the following modes: a first mode in which the UE sends HARQ ACK feedback on a PUCCH on a second carrier in a dedicated radio frequency spectrum band, or a second mode in which the UE chooses to send HARQ ACK feedback on a PUCCH on the second carrier or a PUSCH on the first carrier. The code may also be executable by a processor to send HARQ ACK feedback according to the first mode or the second mode as configured by the RRC signaling.

[0081] In one example, another method for wireless communication at a network access device is described. The method may include: configuring HARQ ACK feedback reporting for a first carrier in a shared radio frequency spectrum band in one of the following modes: a first mode in which a UE sends HARQ ACK feedback on a PUCCH on a second carrier in a dedicated radio frequency spectrum band, or a second mode in which the UE selects to send HARQ ACK feedback on the PUCCH on the second carrier or the PUSCH on the first carrier; sending an indication of the configured HARQ ACK feedback reporting mode to the UE in RRC signaling; and receiving HARQ ACK feedback for the first carrier from the UE according to the configured HARQ ACK feedback reporting mode.

[0082] In one example, another apparatus for wireless communication at a network access device is described. The apparatus may include: a unit for configuring HARQ ACK feedback reporting for a first carrier in a shared radio frequency spectrum band in one of the following modes: a first mode in which a UE sends HARQ ACK feedback on a PUCCH on a second carrier in a dedicated radio frequency spectrum band, or a second mode in which the UE selects to send HARQ ACK feedback on the PUCCH on the second carrier or the PUSCH on the first carrier; a unit for sending an indication of the configured HARQ ACK feedback reporting mode to the UE in RRC signaling; and a unit for receiving HARQ ACK feedback for the first carrier from the UE according to the configured HARQ ACK feedback reporting mode.

[0083] In one example, another apparatus for wireless communication at a network access device is described. The apparatus may include: a processor and a memory in electronic communication with the processor. The processor and the memory may be configured to perform the following operations: configure a HARQ ACK feedback report for a first carrier in a shared radio frequency spectrum band in accordance with one of the following modes: a first mode in which a UE sends HARQ ACK feedback on a PUCCH on a second carrier in a dedicated radio frequency spectrum band, or a second mode in which the UE chooses to send HARQ ACK feedback on the PUCCH on the second carrier or the PUSCH on the first carrier; send an indication of the configured HARQ ACK feedback reporting mode to the UE in RRC signaling; and receive HARQ ACK feedback for the first carrier from the UE according to the configured HARQ ACK feedback reporting mode.

[0084] In one example, another non-transitory computer-readable medium storing computer executable code for wireless communication at a network access device is described. The code may be executable by a processor to perform the following operations: configure HARQ ACK feedback reporting for a first carrier in a shared radio frequency spectrum band in one of the following modes: a first mode in which a UE sends HARQ ACK feedback on a PUCCH on a second carrier in a dedicated radio frequency spectrum band, or a second mode in which the UE selects to send HARQ ACK feedback on the PUCCH on the second carrier or the PUSCH on the first carrier; send an indication of the configured HARQ ACK feedback reporting mode to the UE in RRC signaling; and receive HARQ ACK feedback for the first carrier from the UE according to the configured HARQ ACK feedback reporting mode.

[0085] In one example, another method for wireless communication at a UE is described. The method may include: receiving an indication of invalid PUSCH resource allocation for a TTI over a shared radio frequency spectrum band; and sending aperiodic CSI without PUSCH in the TTI.

[0086] In some examples of the method, the invalid PUSCH resource allocation may include an invalid frequency staggered combination with a specified bit pattern for a redundancy version (RV) and an NDI. In some examples, the method may include interpreting a HARQ identifier (ID) of the TTI as invalid.

[0087] In one example, another apparatus for wireless communication at a UE is described. The apparatus may include: a unit for receiving an indication of an invalid PUSCH resource allocation for a TTI over a shared radio frequency spectrum band; and a unit for sending non-periodic CSI without PUSCH in the TTI.

[0088] In one example, another apparatus for wireless communication at a UE is described. The apparatus may include: a processor and a memory in electronic communication with the processor. The processor and the memory may be configured to perform the following operations: receive an indication of an invalid PUSCH resource allocation for a TTI through a shared radio frequency spectrum band; and send non-periodic CSI without PUSCH in the TTI.

[0089] In one example, another non-transitory computer readable medium storing computer executable code for wireless communication at a UE is described. The code may be executable by a processor to perform the following operations: receiving an indication of an invalid PUSCH resource allocation for a TTI through a shared radio frequency spectrum band; and sending non-periodic CSI without PUSCH in the TTI.

[0090] In one example, another method for wireless communication at a network access device is described. The method may include: sending an indication of invalid PUSCH resource allocation for a TTI over a shared radio frequency spectrum band; and receiving aperiodic CSI without PUSCH in the TTI.

[0091] In some examples of the method, the invalid PUSCH resource allocation may include an invalid frequency staggered combination with a specified bit pattern for RV and NDI.

[0092] In one example, another apparatus for wireless communication at a network access device is described. The apparatus may include: a unit for sending an indication of an invalid PUSCH resource allocation for a TTI over a shared radio frequency spectrum band; and a unit for receiving non-periodic CSI without PUSCH in the TTI.

[0093] In one example, another apparatus for wireless communication at a network access device is described. The apparatus may include: a processor and a memory in electronic communication with the processor. The processor and the memory may be configured to perform the following operations: send an indication of an invalid PUSCH resource allocation for a TTI through a shared radio frequency spectrum band; and receive non-periodic CSI without PUSCH in the TTI.

[0094] In one example, another non-transitory computer readable medium storing computer executable code for wireless communication at a network access device is described. The code may be executable by a processor to perform the following operations: sending an indication of an invalid PUSCH resource allocation for a TTI through a shared radio frequency spectrum band; and receiving non-periodic CSI without PUSCH in the TTI.

[0095] In one example, another method for wireless communication at a UE is described. The method may include: receiving a code point associated with sending aperiodic CSI without PUSCH in a scheduled TTI over a shared radio frequency spectrum band; receiving a multi-TTI grant that references the code point for a TTI scheduled by the multi-TTI grant; and sending aperiodic CSI without PUSCH in the TTI according to the code point.

[0096] In one example, another apparatus for wireless communication at a UE is described. The apparatus may include: a unit for receiving a code point associated with sending aperiodic CSI without PUSCH in a scheduled TTI over a shared radio frequency spectrum band; a unit for receiving a multi-TTI grant, the multi-TTI grant referencing the code point for a TTI scheduled by the multi-TTI grant; and a unit for sending aperiodic CSI without PUSCH in the TTI according to the code point.

[0097] In one example, another apparatus for wireless communication at a UE is described. The apparatus may include: a processor and a memory in electronic communication with the processor. The processor and the memory may be configured to perform the following operations: receiving a code point associated with sending non-periodic CSI without PUSCH in a scheduled TTI through a shared radio frequency spectrum band; receiving a multi-TTI grant, the multi-TTI grant references the code point of a TTI scheduled by the multi-TTI grant; and sending non-periodic CSI without PUSCH in the TTI according to the code point.

[0098] In one example, another non-transitory computer-readable medium storing computer-executable code for wireless communication at a UE is described. The code may be executable by a processor to perform the following operations: receiving a code point associated with sending aperiodic CSI without PUSCH in a scheduled TTI over a shared radio frequency spectrum band; receiving a multi-TTI grant, the multi-TTI grant references the code point for a TTI scheduled by the multi-TTI grant; and sending aperiodic CSI without PUSCH in the TTI according to the code point.

[0099] In one example, another method for wireless communication at a network access device is described. The method may include: identifying an expected frequency of an SRS request; identifying an aperiodic SRS without a PUSCH to be transmitted over a shared radio frequency spectrum band during a TTI; determining a contention window size to be used by a UE when performing an LBT procedure to contend for access to the shared radio frequency spectrum band in order to transmit the aperiodic SRS, wherein the determined contention window size is based at least in part on the expected frequency of the SRS request; and sending an indication of the determined contention window size to the UE.

[0100] In some examples of the method, the indication of the determined contention window size may be sent in RRC signaling.

[0101] In one example, another apparatus for wireless communication at a network access device is described. The apparatus may include: a unit for identifying an expected frequency of an SRS request; a unit for identifying an aperiodic SRS without a PUSCH to be transmitted over a shared radio frequency spectrum band during a TTI; a unit for determining a contention window size to be used by a UE when performing an LBT process to contend for access to the shared radio frequency spectrum band in order to transmit the aperiodic SRS, wherein the determined contention window size is based at least in part on the expected frequency of the SRS request; and a unit for sending an indication of the determined contention window size to the UE unit.

[0102] In one example, another apparatus for wireless communication at a network access device is described. The apparatus may include: a processor and a memory in electronic communication with the processor. The processor and the memory may be configured to perform the following operations: identifying an expected frequency of an SRS request; identifying an aperiodic SRS without a PUSCH to be transmitted over a shared radio frequency spectrum band during a TTI; determining a contention window size to be used by a UE when performing an LBT process to compete for access to the shared radio frequency spectrum band in order to transmit the aperiodic SRS, wherein the determined contention window size is based at least in part on the expected frequency of the SRS request; and sending an indication of the determined contention window size to the UE.

[0103] In one example, another non-transitory computer-readable medium storing computer executable code for wireless communication at a network access device is described. The code may be executable by a processor to perform the following operations: identifying an expected frequency of an SRS request; identifying an aperiodic SRS without a PUSCH to be transmitted over a shared radio frequency spectrum band during a TTI; determining a contention window size to be used by a UE when performing an LBT procedure to contend for access to the shared radio frequency spectrum band in order to transmit the aperiodic SRS, wherein the determined contention window size is based at least in part on the expected frequency of the SRS request; and sending an indication of the determined contention window size to the UE.

[0104] In one example, another method for wireless communication at a UE is described. The method may include: receiving a trigger for sending an SRS during a TTI in a downlink DCI; receiving scheduling information for a PUSCH to be sent during the TTI, wherein the scheduling information does not include a gap for sending the SRS; and sending one of the following during the TTI: the PUSCH rate matched around the SRS, the PUSCH punctured by the SRS, the PUSCH without the SRS, or the SRS without the PUSCH.

[0105] In one example, another apparatus for wireless communication at a UE is described. The apparatus may include: a unit for receiving a trigger for sending an SRS during a TTI in a downlink DCI; a unit for receiving scheduling information for a PUSCH to be sent during the TTI, wherein the scheduling information does not include a gap for sending the SRS; and a unit for sending one of the following during the TTI: the PUSCH rate matched near the SRS, the PUSCH punctured by the SRS, the PUSCH without the SRS, or the SRS without the PUSCH.

[0106] In one example, another apparatus for wireless communication at a UE is described. The apparatus may include: a processor and a memory in electronic communication with the processor. The processor and the memory may be configured to perform the following operations: receiving a trigger for sending an SRS during a TTI in a downlink DCI; receiving scheduling information for a PUSCH to be sent during the TTI, wherein the scheduling information does not include a gap for sending the SRS; and sending one of the following during the TTI: the PUSCH rate matched near the SRS, the PUSCH punctured by the SRS, the PUSCH without the SRS, or the SRS without the PUSCH.

[0107] In one example, another non-transitory computer-readable medium storing computer-executable code for wireless communication at a UE is described. The code may be executable by a processor to perform the following operations: receiving a trigger for sending an SRS during a TTI in a downlink DCI; receiving scheduling information for a PUSCH to be sent during the TTI, wherein the scheduling information does not include a gap for sending the SRS; and sending one of the following during the TTI: the PUSCH rate matched around the SRS, the PUSCH punctured by the SRS, the PUSCH without the SRS, or the SRS without the PUSCH.

[0108] In one example, another method for wireless communication at a UE is described. The method may include: receiving a first indication of a default initial timing advance for a first carrier in a shared radio frequency spectrum band, wherein the default initial timing advance includes: a timing advance for a second carrier in a dedicated radio frequency spectrum band, and wherein the first carrier and the second carrier are in the same timing advance group (TAG); or a static initial timing advance; or a combination thereof. The method may also include: receiving a second indication of a default initial uplink transmit power; and transmitting on the first carrier based at least in part on the default initial timing advance and the default initial uplink transmit power.

[0109] In some examples of the method, the static initial timing advance may be zero. In some examples, the default initial uplink transmit power may be a maximum uplink transmit power. In some examples, the second indication may be received in at least one of: a system information block, an RRC configuration, or a combination thereof. In some examples, the method may include receiving a plurality of code points indicating different uplink transmit power adjustment steps and a code point providing the second indication.

[0110] In one example, another apparatus for wireless communication at a UE is described. The apparatus may include: a unit for receiving a first indication of a default initial timing advance for a first carrier in a shared radio frequency spectrum band, wherein the default initial timing advance includes: a timing advance for a second carrier in a dedicated radio frequency spectrum band, and wherein the first carrier and the second carrier are in the same TAG; or a static initial timing advance; or a combination thereof. The apparatus may also include: a unit for receiving a second indication of a default initial uplink transmit power; and a unit for transmitting on the first carrier based at least in part on the default initial timing advance and the default initial uplink transmit power.

[0111] In one example, another apparatus for wireless communication at a UE is described. The apparatus may include: a processor and a memory in electronic communication with the processor. The processor and the memory may be configured to receive a first indication of a default initial timing advance for a first carrier in a shared radio frequency spectrum band, wherein the default initial timing advance includes: a timing advance for a second carrier in a dedicated radio frequency spectrum band, and wherein the first carrier and the second carrier are in the same TAG; or a static initial timing advance; or a combination thereof. The processor and the memory may also be configured to perform the following operations: receive a second indication of a default initial uplink transmit power; and transmit on the first carrier based at least in part on the default initial timing advance and the default initial uplink transmit power.

[0112] In one example, another non-transitory computer-readable medium storing computer-executable code for wireless communication at a UE is described. The code may be executable by a processor to receive a first indication of a default initial timing advance for a first carrier in a shared radio frequency spectrum band, wherein the default initial timing advance comprises: a timing advance for a second carrier in a dedicated radio frequency spectrum band, and wherein the first carrier and the second carrier are in the same TAG; or a static initial timing advance; or a combination thereof. The code may also be executable by the processor to perform the following operations: receive a second indication of a default initial uplink transmit power; and transmit on the first carrier based at least in part on the default initial timing advance and the default initial uplink transmit power.

[0113] In one example, another method for wireless communication at a network access device is described. The method may include: selecting at least one of the following from a plurality of code points: a first code point for controlling transmit power in a single TTI uplink transmission; a second code point for controlling transmit power in multiple TTI uplink transmissions; a third code point associated with transmitting at maximum transmit power during a single TTI uplink transmission or multiple TTI uplink transmissions; or a combination thereof. The first code point and the second code point may be associated with different transmit powers. The method may also include: sending a transmit power control (TPC) command to the UE. The TPC command may include the at least one selected code point.

[0114] In some examples, the method may include: scheduling uplink transmissions performed by the UE, wherein the scheduled uplink transmissions may include a single TTI uplink transmission or multiple TTI uplink transmissions; and sending an uplink grant to the UE that references a code point sent in the TPC command. In some examples, the second code point may identify an uplink transmit power adjustment step that is larger than the first code point.

[0115] In one example, another apparatus for wireless communication at a network access device is described. The apparatus may include: a unit for selecting at least one of the following from a plurality of code points: a first code point for controlling transmit power in a single TTI uplink transmission; a second code point for controlling transmit power in multiple TTI uplink transmissions; a third code point associated with transmitting at maximum transmit power during a single TTI uplink transmission or multiple TTI uplink transmissions; or a combination thereof. The first code point and the second code point may be associated with different transmit powers. The apparatus may also include: a unit for sending a TPC command to a UE. The TPC command may include the at least one selected code point.

[0116] In one example, another apparatus for wireless communication at a network access device is described. The apparatus may include: a processor and a memory in electronic communication with the processor. The processor and the memory may be configured to select at least one of the following from a plurality of code points: a first code point for controlling transmit power in a single TTI uplink transmission; a second code point for controlling transmit power in multiple TTI uplink transmissions; a third code point associated with transmitting at maximum transmit power during a single TTI uplink transmission or multiple TTI uplink transmissions; or a combination thereof. The first code point and the second code point may be associated with different transmit powers. The processor and the memory may also be configured to send a TPC command to the UE. The TPC command may include the at least one selected code point.

[0117] In one example, another non-transitory computer-readable medium storing computer-executable code for wireless communication at a network access device is described. The code may be executable by a processor to select at least one of the following from a plurality of code points: a first code point for controlling transmit power in a single TTI uplink transmission; a second code point for controlling transmit power in multiple TTI uplink transmissions; a third code point associated with transmitting at maximum transmit power during a single TTI uplink transmission or multiple TTI uplink transmissions; or a combination thereof. The first code point and the second code point may be associated with transmit power. The code may be executable by the processor to send a TPC command to a UE. The TPC command may include the at least one selected code point.

[0118] The foregoing has been fairly broadly summarized according to the technology and technical advantages of the examples of the present disclosure, so that the subsequent detailed description can be better understood. Additional technologies and advantages will be described below. The disclosed concepts and specific examples can be easily used as the basis for modifying or designing other structures for the same purpose of achieving the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. When considered in conjunction with the accompanying drawings, the characteristics of the concepts disclosed herein in both their organization and method of operation and the associated advantages will be better understood from the following description. Each figure in the accompanying drawings is provided for the purpose of illustration and description rather than as a definition of limitations to the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0119] A further understanding of the nature and advantages of the present invention may be achieved by reference to the following drawings. In the drawings, similar components or functions may have the same reference numerals. In addition, various components of the same type may be distinguished by following the reference numeral with a dash and a second reference numeral that distinguishes between similar components. If only the first reference numeral is used in the specification, the description applies to any of the similar components having the same first reference numeral, without regard to the second reference numeral.

[0120] Figure 1 An example of a wireless communication system according to various aspects of the present disclosure is shown;

[0121] Figure 2 A wireless communication system in which LTE / LTE-A may be deployed in different scenarios using a shared radio frequency spectrum band according to various aspects of the present disclosure is shown;

[0122] Figure 3 A timeline illustrating wireless communications between a base station and a plurality of UEs according to various aspects of the present disclosure;

[0123] Figure 4 A timeline illustrating wireless communications between a base station and a plurality of UEs according to various aspects of the present disclosure;

[0124] Figure 5 A block diagram illustrating an apparatus for use in wireless communications according to various aspects of the present disclosure is shown;

[0125] Figure 6 A block diagram illustrating an apparatus for use in wireless communications according to various aspects of the present disclosure is shown;

[0126] Figure 7 A block diagram of a UE for use in wireless communications according to various aspects of the present disclosure is shown;

[0127] Figure 8 A block diagram of a base station for use in wireless communications according to various aspects of the present disclosure is shown;

[0128] Fig. 9 is a flow chart illustrating an example of a method for wireless communication at a network access device according to various aspects of the present disclosure;

[0129] Fig.10 is a flow chart illustrating an example of a method for wireless communication at a UE according to various aspects of the present disclosure;

[0130] Fig.11 is a flow chart illustrating an example of a method for wireless communication at a UE according to various aspects of the present disclosure;

[0131] Fig.12 is a flow chart illustrating an example of a method for wireless communication at a UE according to various aspects of the present disclosure;

[0132] Fig.13 is a flow chart illustrating an example of a method for wireless communication at a UE according to various aspects of the present disclosure;

[0133] Fig.14 is a flow chart illustrating an example of a method for wireless communication at a UE according to various aspects of the present disclosure;

[0134] Fig.15 is a flow chart illustrating an example of a method for wireless communication at a UE according to various aspects of the present disclosure;

[0135] Fig.16 is a flow chart illustrating an example of a method for wireless communication at a UE according to various aspects of the present disclosure;

[0136] Fig.17 is a flow chart illustrating an example of a method for wireless communication at a network access device according to various aspects of the present disclosure;

[0137] Fig.18 is a flow chart illustrating an example of a method for wireless communication at a UE according to various aspects of the present disclosure;

[0138] Fig.19 is a flow chart illustrating an example of a method for wireless communication at a network access device according to various aspects of the present disclosure;

[0139] Fig. 20 is a flow chart illustrating an example of a method for wireless communication at a UE according to various aspects of the present disclosure;

[0140] Fig.21 is a flow chart illustrating an example of a method for wireless communication at a UE according to various aspects of the present disclosure;

[0141] Fig. 22 is a flow chart illustrating an example of a method for wireless communication at a UE according to various aspects of the present disclosure;

[0142] Fig.23 is a flow chart illustrating an example of a method for wireless communication at a UE according to various aspects of the present disclosure;

[0143] Fig.24 is a flow chart illustrating an example of a method for wireless communication at a network access device according to various aspects of the present disclosure;

[0144] Fig.25 is a flow chart illustrating an example of a method for wireless communication at a UE according to various aspects of the present disclosure;

[0145] Fig.26 is a flow chart illustrating an example of a method for wireless communication at a network access device according to various aspects of the present disclosure;

[0146] Fig. 27 is a flow chart illustrating an example of a method for wireless communication at a UE according to various aspects of the present disclosure;

[0147] Fig.28 is a flow chart illustrating an example of a method for wireless communication at a network access device according to various aspects of the present disclosure;

[0148] Fig.29 is a flow chart illustrating an example of a method for wireless communication at a UE according to various aspects of the present disclosure;

[0149] Fig.30 is a flow chart illustrating an example of a method for wireless communication at a UE according to various aspects of the present disclosure; and

[0150] Fig.31 is a flow chart illustrating an example of a method for wireless communication at a network access device according to various aspects of the present disclosure. DETAILED DESCRIPTION

[0151] Technologies are described in which shared radio frequency spectrum bands are used for at least a portion of communications in a wireless communication system. In some examples, shared radio frequency spectrum bands may be used for Long Term Evolution (LTE) or Advanced LTE (LTE-A) communications. Shared radio frequency spectrum bands may be used in conjunction with or independently of dedicated radio frequency spectrum bands. Dedicated radio frequency spectrum bands may include radio frequency spectrum bands that are licensed to specific users for specific purposes. Shared radio frequency spectrum bands may include radio frequency spectrum bands available for use by Wi-Fi, radio frequency spectrum bands available for use by different wireless access technologies, or radio frequency spectrum bands available for use by multiple mobile network operators (MNOs) in an equally shared or prioritized manner.

[0152] As data traffic in cellular networks using dedicated RF spectrum bands increases, offloading at least some of the data traffic to shared RF spectrum bands may provide cellular operators (e.g., operators of public land mobile networks (PLMNs) or a coordinated set of base stations that define a cellular network such as an LTE / LTE-A network) with the opportunity for enhanced data transmission capacity. The use of shared RF spectrum bands may also provide services in areas where access to dedicated RF spectrum bands is unavailable. Prior to communicating over a shared RF spectrum band, a transmitting device may perform a listen before talk (LBT) process to compete for access to the shared RF spectrum band. Such an LBT process may include performing a clear channel assessment (CCA) process (or an extended CCA process) to determine whether a channel of the shared RF spectrum band is available. When it is determined that a channel of the shared RF spectrum band is available, a channel reservation signal (e.g., a channel usage beacon signal (CUBS)) may be sent to reserve the channel. When it is determined that the channel is unavailable, a CCA process (or an extended CCA process) may be performed again for the channel at a later time.

[0153] The following description provides examples, not limitations on the scope, applicability, or examples set forth in the claims. Changes may be made in the functions and arrangements of the elements discussed without departing from the scope of the present disclosure. Various examples may omit, replace, or add various processes or components as appropriate. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. In addition, features described with respect to certain examples may be combined in other examples.

[0154] Figure 1 An example of a wireless communication system 100 according to various aspects of the present disclosure is shown. The wireless communication system 100 may include a base station 105 (i.e., a type of network access device), a UE 115, and a core network 130. The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connections, and other access, routing, or mobility functions. The base station 105 may interact with the core network 130 via a backhaul link 132 (e.g., S1, etc.), and may perform wireless configuration and scheduling for communications with the UE 115, or may operate under the control of a base station controller (not shown). In various examples, the base stations 105 may communicate with each other directly or indirectly (e.g., through the core network 130) via a backhaul link 134 (e.g., X1, etc.), which may be a wired or wireless communication link.

[0155] The base station 105 can communicate wirelessly with the UE 115 via one or more base station antennas. Each base station 105 site in the base station 105 site can provide communication coverage for a respective geographic coverage area 110. In some examples, the base station 105 can be referred to as a network access device, a base station transceiver, a wireless base station, an access point, a wireless transceiver, a node B, an evolved node B (eNB), a home node B, a home evolved node B, or some other suitable term. The geographic coverage area 110 of the base station 105 can be divided into sectors (not shown) that constitute a portion of the coverage area. The wireless communication system 100 may include different types of base stations 105 (e.g., macro or small cell base stations). For different technologies and / or different types of network access devices, there may be overlapping geographic coverage areas 110.

[0156] In some examples, the wireless communication system 100 may include an LTE / LTE-A network. In an LTE / LTE-A network, the term evolved Node B (eNB) may be used to describe the base station 105. The wireless communication system 100 may be a heterogeneous LTE / LTE-A network in which different types of eNBs provide coverage for various geographic areas. For example, each eNB or base station 105 may provide communication coverage for a macro cell, a small cell, or other types of cells. The term "cell" is a 3GPP term that, depending on the context, may be used to describe a base station, a carrier or component carrier associated with a base station, or a coverage area (e.g., a sector, etc.) of a carrier or base station.

[0157] A macro cell may cover a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access by a UE with a service subscription to a network provider. A small cell that may operate in the same or different (e.g., licensed, unlicensed, etc.) radio frequency spectrum band as a macro cell may be a lower power base station when compared to a macro cell. According to various examples, a small cell may include a pico cell, a femto cell, and a micro cell. A pico cell may cover a relatively small geographic area and may allow unrestricted access by a UE with a service subscription to a network provider. A femto cell may also cover a relatively small geographic area (e.g., a home) and may provide restricted access by a UE with an association with a femto cell (e.g., a UE in a closed subscriber group (CSG), a UE of a user in a home, etc.). 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 more (e.g., two, three, four, etc.) cells (e.g., component carriers).

[0158] The wireless communication system 100 may support synchronous or asynchronous operation. For synchronous operation, the base stations 105 may have similar frame timing and may approximately align transmissions from different base stations 105 in time. For asynchronous operation, the base stations 105 may have different frame timing and may not align transmissions from different base stations 105 in time. The techniques described herein may be used for either synchronous or asynchronous operation.

[0159] A communication network that can accommodate some of the various disclosed examples can be a packet-based network operating according to a layered protocol stack. In the user plane, the communication at the bearer or packet data convergence protocol (PDCP) layer can be IP-based. The radio link control (RLC) layer can perform packet segmentation and assembly for transmission through logical channels. The medium access control (MAC) layer can perform priority handling and multiplex logical channels into transport channels. The MAC layer can also use hybrid ARQ (HARQ) to provide retransmission at the MAC layer to improve link efficiency. In the control plane, the radio resource control (RRC) protocol layer can provide the establishment, configuration and maintenance of the RRC connection between the UE 115 and the base station 105 or the core network 130 that supports the radio bearer for the user plane data. At the physical (PHY) layer, the transport channel can be mapped to the physical channel.

[0160] UE 115 may be dispersed throughout the wireless communication system 100, and each UE 115 may be fixed or mobile. UE 115 may also include or be referred to by those skilled in the art 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 communication 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 term. 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 wireless local loop (WLL) station, etc. UE may be capable of communicating with various types of base stations or other types of network access devices or network devices including macro eNBs, small cell eNBs, relay base stations, etc.

[0161] The communication link 125 shown in the wireless communication system 100 may include a downlink (DL) from the base station 105 to the UE 115 or an uplink (UL) from the UE 115 to the base station 105. The downlink may also be referred to as a forward link and the uplink may also be referred to as a reverse link.

[0162] In some examples, each communication link 125 may include one or more carriers, where each carrier may be a signal composed of multiple subcarriers (e.g., waveform signals of different frequencies) modulated according to the various wireless technologies described above. Each modulated signal may be sent on a different subcarrier and may carry control information (e.g., reference signals, control channels, etc.), overhead information, user data, etc. The communication link 125 may send bidirectional communications using frequency domain duplex (FDD) operation (e.g., using paired spectrum resources) or time domain duplex (TDD) operation (e.g., using unpaired spectrum resources). Frame structures for FDD operation (e.g., frame structure type 1) and TDD operation (e.g., frame structure type 2) may be defined.

[0163] In some examples of the wireless communication system 100, the base station 105 or the UE 115 may include multiple antennas for using an antenna diversity scheme to improve the communication quality and reliability between the base station 105 and the UE 115. Additionally or alternatively, the base station 105 or the UE 115 may use multiple-input multiple-output (MIMO) technology, which can utilize a multipath environment to send multiple spatial layers carrying the same or different encoded data.

[0164] The wireless communication system 100 may support operation on multiple cells or carriers - a feature that may be referred to as carrier aggregation (CA) or dual connectivity operation. A carrier may also be referred to as a component carrier (CC), layer, channel, etc. The terms "carrier", "component carrier", "cell" and "channel" may be used interchangeably herein. Carrier aggregation may be used with both FDD and TDD component carriers.

[0165] In an LTE / LTE-A network, UE 115 may be configured to communicate using up to five CCs when operating in a carrier aggregation mode or a dual connectivity mode. One or more CCs in the CCs may be configured as DL CCs, and one or more CCs in the CCs may be configured as UL CCs. In addition, one CC in the CCs allocated to UE 115 may be configured as a primary CC (PCC), and the remaining CCs allocated to UE 115 may be configured as secondary CCs (SCCs).

[0166] In some examples, the wireless communication system 100 can support operation via a dedicated RF spectrum band (e.g., a RF spectrum band licensed to a specific user for a specific purpose) or a shared RF spectrum band (e.g., a RF spectrum band available for use by Wi-Fi, a RF spectrum band available for use by different wireless access technologies, or a RF spectrum band available for use by multiple MNOs in an equally shared or prioritized manner).

[0167] Figure 2 A wireless communication system 200 is shown in which LTE / LTE-A can be deployed in different scenarios using shared radio frequency spectrum bands according to various aspects of the present disclosure. Specifically, Figure 2 Examples of a supplemental downlink mode (also referred to as a licensed assisted access (LAA) mode), a carrier aggregation mode (also referred to as an enhanced LAA (eLAA) mode), and a standalone mode are shown, in which LTE / LTE-A is deployed using a shared radio frequency spectrum band. The wireless communication system 200 may be as described in reference Figure 1 An example of a portion of the wireless communication system 100 described herein. In addition, the first base station 205 and the second base station 205-a may be reference Figure 1 An example of aspects of one or more base stations 105 in the base station 105 described, and the first UE 215, the second UE 215-a and the third UE 215-b can be as described in reference Figure 1 Examples of aspects of one or more of UEs 115 in the described UEs 115.

[0168] In an example of a supplemental downlink mode (e.g., LAA mode) in a wireless communication system 200, a first base station 205 may use a downlink channel 220 to send an orthogonal frequency division multiple access (OFDMA) waveform to a first UE 215. The downlink channel 220 may be associated with a frequency F1 in a shared radio frequency spectrum band. The first base station 205 may use a first bidirectional link 225 to send an OFDMA waveform to the first UE 215, and may use a first bidirectional link 225 to receive a single carrier frequency division multiple access (FDMA) (SC-FDMA) waveform from the first UE 215. The first bidirectional link 225 may be associated with a frequency F4 in a dedicated radio frequency spectrum band. The downlink channel 220 in the shared radio frequency spectrum band and the first bidirectional link 225 in the dedicated radio frequency spectrum band may operate simultaneously. The downlink channel 220 may provide downlink capacity offloading for the first base station 205. In some examples, the downlink channel 220 may be used for unicast services (e.g., addressed to one UE) or multicast services (e.g., addressed to several UEs). This scenario can occur with any service provider (e.g., MNO) that uses a dedicated RF spectrum band and needs to alleviate some of the traffic or signaling congestion.

[0169] In an example of a carrier aggregation mode (e.g., eLAA mode) in a wireless communication system 200, the first base station 205 can use a second bidirectional link 230 to send an OFDMA waveform to a second UE 215-a, and can use the second bidirectional link 230 to receive an OFDMA waveform, an SC-FDMA waveform, or a resource block interleaved FDMA waveform from the second UE 215-a. The second bidirectional link 230 can be associated with a frequency F1 in a shared radio frequency spectrum band. The first base station 205 can also use a third bidirectional link 235 to send an OFDMA waveform to the second UE 215-a, and can use the third bidirectional link 235 to receive an SC-FDMA waveform from the second UE 215-a. The third bidirectional link 235 can be associated with a frequency F2 in a dedicated radio frequency spectrum band. The third bidirectional link 235 can provide downlink and uplink capacity offloading for the first base station 205. Similar to the supplemental downlink mode (e.g., LAA mode) described above, this scenario can occur with any service provider (e.g., MNO) that uses a dedicated RF spectrum band and needs to alleviate some of the traffic or signaling congestion.

[0170] As described above, one type of service provider that can benefit from the capacity offloading provided by using LTE / LTE-A in a shared RF spectrum band is a traditional MNO with access to the LTE / LTE-A licensed RF spectrum band. For these service providers, examples of operation may include a bootstrap mode (e.g., supplemental downlink, carrier aggregation) using an LTE / LTE-A PCC on a dedicated RF spectrum band and at least one SCC on a shared RF spectrum band.

[0171] In carrier aggregation mode, data and control may be transmitted, for example, in a dedicated RF spectrum band (e.g., via the third bidirectional link 235), while data may be transmitted, for example, in a shared RF spectrum band (e.g., via the second bidirectional link 230). The carrier aggregation mechanisms supported when using a shared RF spectrum band may fall under hybrid frequency division duplex-time division duplex (FDD-TDD) carrier aggregation or TDD-TDD carrier aggregation with different symmetries across component carriers.

[0172] In one example of a standalone mode in a wireless communication system 200, a second base station 205-a may transmit an OFDMA waveform to a third UE 215-b using a bidirectional link 245, and may receive an OFDMA waveform, an SC-FDMA waveform, or a resource block interleaved FDMA waveform from a third UE 215-b using a bidirectional link 245. The bidirectional link 245 may be associated with a frequency F3 in a shared radio frequency spectrum band. The standalone mode may be used in a non-traditional wireless access environment such as access (e.g., unicast, multicast) in a stadium. Examples of types of service providers for this mode of operation may be a stadium owner, a cable company, an event organizer, a hotel, an enterprise, or a large company that does not have access to a dedicated radio frequency spectrum band.

[0173] In some examples, such as reference Figure 1 or one of the base stations 105, 205 or 205-a described in 2 or as described in reference Figure 1 Or a transmitting device of one of the UEs 115, 215, 215-a or 215-b described in 2 may use a gating interval to obtain access to a wireless channel of a shared radio frequency spectrum band (e.g., a physical channel of a shared radio frequency spectrum band). In some examples, the gating interval may be synchronous and periodic. For example, a periodic gating interval may be synchronized with at least one boundary of an LTE / LTE-A radio interval. In other examples, the gating interval may be asynchronous. The gating interval may define the application of a sharing protocol, such as an LBT protocol based on the LBT protocol (EN 301 893) defined in the European Telecommunications Standards Institute (ETSI). When using a gating interval that defines the application of the LBT protocol, the gating interval may indicate when the transmitting device needs to perform a contention process (e.g., an LBT process) such as a CCA process or an extended CCA (ECCA) process. The result of the CCA process or the ECCA process may indicate to the transmitting device whether the wireless channel of the shared radio frequency spectrum band is available for the gating interval (e.g., an LBT radio frame or a transmission burst) or is in use. When the CCA process or ECCA process indicates that the wireless channel is available for the corresponding LBT radio frame or transmission burst (for example, for use "idle"), the transmitting device may reserve or use the wireless channel of the shared radio frequency spectrum band during part or all of the content of the LBT radio frame. When the CCA process or ECCA process indicates that the wireless channel is not available (for example, the wireless channel is being used or reserved by another transmitting device), the transmitting device may avoid using the wireless channel during the LBT radio frame. In some examples, the transmitting device may need to perform a CCA process or an ECCA process for some wireless channels in the shared radio frequency spectrum band but not for other wireless channels.

[0174] Figure 3 A timeline 300 of wireless communications between a base station and a plurality of UEs according to various aspects of the present disclosure is shown. The wireless communications may occur in a shared radio frequency spectrum band. The shared radio frequency spectrum band may include a radio frequency spectrum band available for use by Wi-Fi, a radio frequency spectrum band available for use by different wireless access technologies, or a radio frequency spectrum band available for use by multiple MNOs in an equally shared or prioritized manner. In some examples, the base station and the UE communicating in the shared radio frequency spectrum band may be as described in reference to Figure 1 or 2 describes an example of aspects of a base station 105, 205, or 205-a and a UE 115, 215, 215-a, or 215b.

[0175] In some examples, the base station may perform an LBT process 305 (e.g., a CCA process or an ECCA process) at time t0 prior to the transmission opportunity 310. The LBT process 305 may be performed to compete for access to a shared radio frequency spectrum band during the transmission opportunity 310. The transmission opportunity 310 may be associated with a maximum channel occupancy time (MCOT) 315. When the base station wins the competition for access to the shared radio frequency spectrum band for the transmission opportunity 310, the base station may transmit to one or more UEs during multiple TTI transmission time intervals (TTIs) (e.g., during multiple downlink (DL) subframes). The base station may also schedule uplink transmissions from one or more UEs during multiple TTIs (e.g., during multiple uplink (UL) subframes). When the base station loses contention for access to the shared radio frequency spectrum band for transmission opportunity 310, the base station may not transmit or schedule uplink transmissions during transmission opportunity 310 and may have to delay communications with one or more UEs until a subsequent transmission opportunity (e.g., a subsequent transmission opportunity during which the base station wins contention for access to the shared radio frequency spectrum band). Figure 3 Assume that the base station wins the competition for access to the shared RF spectrum band during the LBT process 305.

[0176] By way of example, timeline 300 shows a downlink period 320 followed by an uplink period 325 that ends within a transmission opportunity 310. Downlink transmissions may be sent during the downlink period 320, and uplink transmissions may be sent during the uplink period 325. One or more uplink grants for uplink transmissions may be sent and received during the downlink period 320. Prior to sending an uplink transmission during the uplink period 325, the UE may perform an LBT process 330 (e.g., a CCA process or an ECCA process) at time t1 prior to the uplink period 325. The LBT process 330 may be performed to contend for access to a shared radio frequency spectrum band for uplink transmissions during the uplink period 325. When the UE wins contention for access to the shared radio frequency spectrum band for uplink transmissions, the UE may transmit to the base station during multiple TTIs (e.g., during multiple U subframes). When the UE loses contention for access to the shared radio frequency spectrum band for uplink transmission, the UE may not transmit during uplink period 325 and may have to delay communications with the base station until a subsequent uplink period (e.g., a subsequent uplink period in which the UE wins contention for access to the shared radio frequency spectrum band). Figure 3 Assume that the UE wins the contention for access to the shared radio frequency spectrum band for uplink transmission during uplink period 325.

[0177] In some examples, the base station may send and the UE may receive information indicating at least one type of LBT process to be performed for an uplink transmission. The information may be sent / received before performing the LBT process 330. In some examples, the information indicating at least one type of LBT process to be performed for an uplink transmission may indicate whether the duration of the uplink transmission is within the MCOT 315 during which a shared radio frequency spectrum band is reserved by the base station. In some examples, the information indicating at least one type of LBT process to be performed for an uplink transmission may indicate the type of LBT process to be performed before sending the uplink transmission. In some examples, an indication of whether the duration of the uplink transmission is within the MCOT 315 or an indication of the type of LBT process to be performed before sending the uplink transmission may be sent / received as at least one bit in an uplink grant for an uplink transmission.

[0178] In some examples, the information indicating at least one type of LBT process to be performed for an uplink transmission may indicate a duration of a portion of the MCOT 315 (e.g., a portion of the MCOT 315 following a downlink period 320) within which a shared radio frequency spectrum band is reserved by the base station and is available for uplink transmission. In some examples, an indication of the duration of the portion of the MCOT 315 within which a shared radio frequency spectrum band is reserved by the base station and is available for uplink transmission may be signaled in a common physical downlink control channel (CPDCCH) received by more than one (or all) UEs. A UE that receives the duration of the portion of the MCOT 315 within which a shared radio frequency spectrum band is reserved by the base station and is available for uplink transmission may use the duration of the portion of the MCOT and the duration of the uplink transmission to determine whether the duration of the uplink transmission is within the MCOT 315.

[0179] In some examples, a UE that receives information indicating at least one type of LBT procedure to be performed for an uplink transmission may use the information to determine that the UE's uplink transmission has a duration that is within the MCOT 315. The UE may also determine that because the uplink transmission has a duration that is within the MCOT 315, the LBT procedure 330 may be a shorter LBT procedure (e.g., a 25 microsecond (μs) LBT procedure).

[0180] In some examples, transmission opportunity 310 may include more than one DL-UL transition (eg, more than one instance of a downlink period 320 followed by an uplink period 325).

[0181] Figure 4 A timeline 400 of wireless communications between a base station and a plurality of UEs according to various aspects of the present disclosure is shown. The wireless communications may occur in a shared radio frequency spectrum band. The shared radio frequency spectrum band may include a radio frequency spectrum band available for use by Wi-Fi, a radio frequency spectrum band available for use by different wireless access technologies, or a radio frequency spectrum band available for use by multiple MNOs in an equally shared or prioritized manner. In some examples, the base station and the UE communicating in the shared radio frequency spectrum band may be as described in reference to Figure 1 Or an example of aspects of the base station 105, 205 or 205-a and the UE 115, 215, 215-a or 215-b described in 2.

[0182] In some examples, the base station may perform an LBT process 405 (e.g., a CCA process or an ECCA process) at time t0 before the transmission opportunity 410. The LBT process 405 may be performed to compete for access to a shared radio frequency spectrum band during the transmission opportunity 410. The transmission opportunity 410 may be associated with an MCOT 415. When the base station wins the contention for access to the shared radio frequency spectrum band for the transmission opportunity 410, the base station may transmit to one or more UEs during multiple TTIs (e.g., during multiple D subframes). The base station may also schedule uplink transmissions from one or more UEs during multiple TTIs (e.g., during multiple U subframes). When the base station loses the contention for access to the shared radio frequency spectrum band for the transmission opportunity 410, the base station may not transmit or schedule uplink transmissions during the transmission opportunity 410, and may have to delay communication with one or more UEs until a subsequent transmission opportunity (e.g., a subsequent transmission opportunity during which the base station wins the contention for access to the shared radio frequency spectrum band). Figure 4 Assume that the base station wins the competition for access to the shared RF spectrum band during the LBT process 405.

[0183] By way of example, timeline 400 shows a downlink period 420 followed by an uplink period 425. The uplink period 425 may extend beyond the end of the transmission opportunity 410. Downlink transmissions may be sent during the downlink period 420, and uplink transmissions may be sent during the uplink period 425. One or more uplink grants for uplink transmissions may be sent and received during the downlink period 420. Prior to sending an uplink transmission during the uplink period 425, the UE may perform an LBT process 430 (e.g., a CCA process or an ECCA process) at time t1 before the uplink period 425. The LBT process 430 may be performed to contend for access to a shared radio frequency spectrum band for uplink transmissions during the uplink period 425. When the UE wins contention for access to the shared radio frequency spectrum band for uplink transmissions, the UE may transmit to the base station during multiple TTIs (e.g., during multiple U subframes). When the UE loses contention for access to the shared radio frequency spectrum band for uplink transmission, the UE may not transmit during uplink period 425 and may have to delay communications with the base station until a subsequent uplink period (e.g., a subsequent uplink period during which the UE wins contention for access to the shared radio frequency spectrum band). Figure 4 Assume that the UE wins the contention for access to the shared radio frequency spectrum band for uplink transmission during uplink period 425.

[0184] In some examples, the base station may send and the UE may receive information indicating at least one type of LBT process to be performed for an uplink transmission. The information may be sent / received before performing the LBT process 430. In some examples, the information indicating at least one type of LBT process to be performed for an uplink transmission may indicate whether the duration of the uplink transmission is within the MCOT 415 during which a shared radio frequency spectrum band is reserved by the base station. In some examples, the information indicating at least one type of LBT process to be performed for an uplink transmission may indicate a type of LBT process to be performed before sending the uplink transmission. In some examples, an indication of whether the duration of the uplink transmission is within the MCOT 415 or an indication of the type of LBT process to be performed before sending the uplink transmission may be sent / received as at least one bit in an uplink grant for an uplink transmission.

[0185] In some examples, the information indicating at least one type of LBT process to be performed for the uplink transmission may indicate a duration of a portion of the MCOT 415 (e.g., a portion of the MCOT 415 following the downlink period 420) during which the shared radio frequency spectrum band is reserved by the base station and can be used for uplink transmission. In some examples, an indication of the duration of the portion of the MCOT 415 during which the shared radio frequency spectrum band is reserved by the base station and can be used for uplink transmission may be signaled in a CPDCCH received by more than one (or all) UEs. A UE that receives the duration of the portion of the MCOT 415 during which the shared radio frequency spectrum band is reserved by the base station and can be used for uplink transmission may use the duration of the portion of the MCOT 415 and the duration of the uplink transmission to determine whether the duration of the uplink transmission is within the MCOT 415.

[0186] In some examples, a UE that receives information indicating at least one type of LBT procedure to be performed for an uplink transmission may use the information to determine that the UE's uplink transmission has a duration exceeding MCOT 415. The UE may also determine that, because the uplink transmission has a duration exceeding MCOT 415, the LBT procedure 430 may be a shorter type of LBT procedure (e.g., a 25 microsecond LBT procedure), but a longer type of LBT procedure (e.g., a Category 4 (CAT 4) LBT procedure) needs to be performed before continuing the uplink transmission beyond the end of MCOT 415. Alternatively, the UE may determine that, because the uplink transmission has a duration exceeding MCOT 415, the LBT procedure 430 may need to be a longer type of LBT procedure (e.g., a CAT 4 LBT procedure). The longer LBT procedure may be performed using parameters for the LBT priority level. When performing an LBT procedure associated with the LBT priority level, the UE may continue to transmit as long as permitted by the parameters of the LBT priority level (subject to the scheduling constraints of the base station).

[0187] In some examples, transmission opportunity 410 may include more than one DL-UL transition (eg, more than one instance of a downlink period 420 followed by an uplink period 425).

[0188] In some examples, the above-described method may be performed for multiple carriers included in a multi-carrier transmission opportunity. Figure 3 and 4 Similarly, the LBT process 305 or 405 performed by the base station as described in reference 1 can be performed for multiple carriers included in a multi-carrier transmission opportunity. Figure 3 and 4 Described is the LBT process 330 or 430 performed by the UE.

[0189] In some examples, the UE may perform an LBT process during a contention window having a contention window size. When the UE performs an LBT process for contending for access to a channel of a shared radio frequency spectrum band but fails to obtain access to the shared radio frequency spectrum band, the contention window size may be adjusted, and the UE may perform the LBT process again based at least in part on the updated contention window size.

[0190] The contention window size used by the UE to compete for access to a shared radio frequency spectrum band (e.g., the contention window size for a Cat 4 LBT process) may be determined (e.g., initialized, adjusted, or reset) by a network access device, a UE, or a combination thereof. In some examples, the contention window size may be determined at least in part based on a transmission or a received transmission performed during or within a reference scheduled transmission burst comprising multiple consecutive TTIs (e.g., an uplink TTI or an uplink subframe) sent / received via a shared radio frequency spectrum band. In some examples, the contention window size may be determined at least in part based on a transmission or a received transmission performed during or within a reference TTI of a reference scheduled transmission burst sent via a shared radio frequency spectrum band.

[0191] In an example where the network access device determines a contention window size that can be used by the UE, the UE may begin to transmit a TTI (e.g., an uplink TTI or an uplink subframe) of a reference scheduled transmission burst through a shared radio frequency spectrum band, and the network access device may monitor a first reference signal (e.g., a sounding reference signal (SRS) or a demodulation reference signal (DMRS)) received from the UE in the reference scheduled transmission burst. Upon detecting the first reference signal, the network access device may identify the reference TTI in which the first reference signal is received. The network access device can then determine one or more of the following: whether a transport block (TB) on a scheduled physical uplink shared channel (PUSCH) of the reference TTI is correctly decoded; whether non-periodic channel state information (CSI) without PUSCH is triggered on the reference TTI; whether a physical uplink control channel (PUCCH) with a cyclic redundancy check (CRC) is scheduled in the reference TTI and is correctly decoded; whether a random access preamble (e.g., PRACH Msg 1) scheduled on a physical random access channel (PRACH) in the reference TTI is correctly decoded; whether the first scheduled uplink transmission (e.g., PRACH Msg 3) associated with a random access process and received in the reference TTI is correctly decoded; or a combination thereof.

[0192] In response to correctly decoding the TB on the scheduled PUSCH of the reference TTI, the network access device may reset the contention window size used by the UE (e.g., reset to the initial contention window size or the minimum contention window size). In response to determining that the non-periodic CSI without PUSCH is triggered on the reference TTI, the network access device may not update the contention window size. In response to correctly decoding the PUCCH with CRC scheduled in the reference TTI, the network access device may reset the contention window size. In response to correctly decoding the random access preamble scheduled on the PRACH in the reference TTI, the network access device may reset the contention window size. In response to correctly decoding the first scheduled uplink transmission associated with the random access process (the first scheduled uplink transmission is received in the reference TTI), the network access device may reset the contention window size. Otherwise, the network access device may increase the contention window size to the next highest value for all LBT priority levels. The network access device may send an indication of the determined contention window size to the UE.

[0193] Potential advantages of determining at the network device the contention window size used by the UE are a reduction in overhead at the UE and the ability to determine the contention window size based at least in part on the success of the network access device in receiving and correctly decoding the UE's transmissions.

[0194] In an example in which a UE determines the size of a contention window used by the UE, the UE may receive at least one uplink grant for a reference scheduled transmission burst including a plurality of consecutive TTIs (e.g., uplink TTIs or uplink subframes) transmitted through a shared radio frequency spectrum band. In some examples, the UE may receive all uplink grants in the uplink grant for the reference scheduled transmission burst. In other examples, the UE may not receive all uplink grants in the uplink grant for the reference scheduled transmission burst. At least the first uplink grant may include a first indication of the uplink associated with the first scheduled TTI of the reference scheduled transmission burst, a second indication of the position of the first scheduled TTI within the reference scheduled transmission burst (e.g., an indication of the first scheduled TTI associated with the number of TTIs less than 2 scheduled by the current uplink grant), or a combination thereof. In some examples, each uplink grant for the reference scheduled transmission burst may include an indication of the position of the first scheduled TTI of the reference scheduled transmission burst.

[0195] The UE may transmit during at least one TTI of a reference scheduled transmission burst starting with the first transmission TTI.The first transmission TTI may or may not coincide with the first scheduled TTI depending on whether the UE receives and correctly decodes the uplink grant for the first scheduled TTI.

[0196] The network access device may monitor TTIs of a reference scheduled transmission burst and identify a first TTI of a reference scheduled transmission burst in which the network access device correctly decodes at least one TB sent by the UE. The first TTI may be identified (e.g., by the network access device) as a reference TTI of a reference scheduled transmission burst. Alternatively, the network access device may identify the reference TTI as the first TTI of a reference scheduled transmission burst in which the network access device correctly decodes at least one of the following: a PUCCH with a CRC; a random access preamble scheduled on a PRACH (e.g., PRACH Msg 1); a first scheduled uplink transmission associated with a random access procedure (e.g., PRACH Msg 3). The network access device may send an indication of the reference TTI to the UE. In some examples, the indication of the reference TTI may be an indication relative to the first scheduled TTI. When the network access device does not correctly decode at least one TB sent by the UE, in some examples, the network access device may indicate to the UE that no reference TTI was identified.

[0197] In response to receiving an indication of a reference TTI, the UE may determine a contention window size used by the UE to contend for access to a shared radio frequency spectrum band. The contention window size may be determined based at least in part on the relationship between the first scheduled TTI, the reference TTI, and the first transmission TTI. For example, the UE may determine a third relationship between the first transmission TTI and the reference TTI based at least in part on the first relationship between the reference TTI and the first scheduled TTI and at least in part on the second relationship between the first transmission TTI and the first scheduled TTI. When the first transmission TTI is determined to be a TTI earlier than the reference TTI, the UE may increase the contention window size used by the UE. When the first transmission TTI is determined to be a TTI later than the reference TTI, the UE may not update the contention window size. When the first transmission TTI is a reference TTI, the contention window size may be reset (e.g., reset to an initial contention window size or a minimum contention window size).

[0198] A potential advantage of determining at the UE the contention window size used by the UE is that both network access device and UE information regarding transmission activity may be included in the contention window size determination.

[0199] In another example in which the UE determines the contention window size used by the UE, the UE may transmit a reference scheduled transmission burst including multiple consecutive TTIs (e.g., uplink TTIs or uplink subframes) via a shared radio frequency spectrum band. The UE may monitor HARQ acknowledgments (ACKs) for the transmission TTIs, and may identify the first TTI in the TTI for which the HARQ ACK is received as the reference TTI. The UE may also identify a HARQ process corresponding to the reference TTI. The UE may then monitor an instance of a HARQ process associated with a TTI following the reference TTI. An instance of a HARQ process may be identified based at least in part on whether the TTI is within a reference scheduled transmission burst or a subsequent transmission burst, whether the TTI includes irregular CSI without PUSCH, or a combination thereof. In some examples, the identified instance of the HARQ process may be the first instance of a HARQ process that is sent within a reference scheduled transmission burst and does not include irregular CSI without PUSCH. The UE may determine a contention window size used to contend for access to a shared radio frequency spectrum band based on a state of a new data indicator (NDI) associated with an identified instance of a HARQ process.

[0200] As reference Figure 3 Or as described in 4, the network access device can reserve a shared radio frequency spectrum band within the MCOT after successfully competing for access to the shared radio frequency spectrum band. In some examples, the network access device can signal the UE the type of LBT process that the UE needs to perform before transmitting in a set of one or more TTIs. In some examples, the type of LBT process may include an LBT process associated with a smaller contention window size when the uplink transmission starts within the MCOT of the network access device (e.g., a 25 microsecond single-slot LBT process) and an LBT process associated with a larger contention window size when the uplink transmission extends beyond the MCOT of the network access device (e.g., Cat 4 LBT process). In some examples, the type of LBT process (if any) that the UE needs to perform (or needs to have performed) can be signaled in each uplink grant. In some examples, the signaling in the uplink grant may include a bit indicating whether the UE needs to perform a first type of LBT process or a second type of LBT process. However, when the type of LBT process to be performed is indicated in the uplink grant, the UE may not be able to use power saving techniques because the indication is only available for scheduled UEs.

[0201] In addition to or in lieu of signaling the type of LBT procedure to be performed by the UE in an uplink grant sent to the UE, the network access device may indicate to the UE a remaining channel occupancy time (RCOT) of the network access device. The UE may then determine, based at least in part on the RCOT, the type of LBT procedure to be performed (or has been performed) before transmitting in the TTI.

[0202] The LBT priority level and / or other parameters used by the UE to configure the Cat 4 LBT process may be sent by a network access device to the UE or determined by the UE. For example, the UE may send a buffer status report (BSR) to the network access device, and the network access device may determine the LBT priority level (or other LBT parameters) used by the UE when performing the Cat 4 LBT process based at least in part on the BSR. The network access device may then schedule the TTI and gap of the shared radio frequency spectrum band according to the determined LBT priority level, and may send the determined LBT priority level (or associated contention window size) to the UE by signal. The UE may compete for access to the shared radio frequency spectrum band (e.g., perform the Cat 4 LBT process) based at least in part on the LBT priority level, contention window size, or other LBT parameters sent by the signal. Regardless of the LBT priority level used when performing the Cat 4 LBT process, the UE may use logical channel prioritization (LCP) when transmitting during the TTI for which it performs the Cat 4 LBT process. In some examples, the BSR sent by the UE to the network access device may be a first type of BSR that includes an indication of the amount of data to be sent for each of a plurality of LBT priority levels. The amount of data to be sent for each LBT priority level may, in some examples, be used by the network access device to determine whether scheduling the UE in multiple TTIs will result in the UE being likely to send data associated with different LBT priority levels in different TTIs. In some examples, the network access device may determine the LBT priority level to be used by the UE based on the amount of data that the UE has buffered for different LBT priority levels, or the network access device may determine different LBT priority levels to be performed by the UE for different TTIs in which the UE is scheduled to transmit.

[0203] Instead of signaling the determined LBT priority level (or other LBT parameters) to the UE, the network access device may receive a BSR from the UE and determine, based at least in part on the BSR, the LBT priority level (or other LBT parameters) that the UE is likely to use when performing a Cat 4 LBT procedure. The network access device may then schedule the TTIs and gaps of the shared radio frequency spectrum band according to the determined LBT priority level, and may optionally signal the LBT priority level boundaries (or associated contention window size boundaries) to the UE. The LBT priority level boundaries may, for example, be the highest LBT priority level that can be used by the UE, the lowest LBT priority level that can be used by the UE, or a combination thereof. Independent of the LBT priority level determination made by the network access device, or based at least in part on the LBT priority level boundaries signaled by the network access device, the UE may select an LBT priority level for performing a Cat 4 LBT procedure. The UE's selection of an LBT priority level may be based at least in part on the type of data to be sent by the UE over the shared radio frequency spectrum band and / or the number of TTIs in which the UE is scheduled. The UE may contend for access to a shared radio frequency spectrum band (e.g., performing a Cat 4 LBT procedure) based at least in part on a selected LBT priority level. Regardless of the LBT priority level used when performing a Cat 4 LBT procedure, the UE may use LCP when transmitting during a TTI for which it performs a Cat 4 LBT procedure.

[0204] In some examples, the network access device may signal (e.g., in a first uplink grant) that the UE should perform a first LBT process according to a first LBT priority level before transmitting over a shared radio frequency spectrum band in a first set of one or more TTIs, but the UE may not win contention for access to the shared radio frequency spectrum band for the first set of one or more TTIs. The network access device may then signal (e.g., in a second uplink grant) that the UE should perform a second LBT process according to a second LBT priority level before transmitting over a shared radio frequency spectrum band in a second set of one or more TTIs. In some examples, the UE may perform the second LBT process without regard to the LBT state at the (unsuccessful) end of the first LBT process. In other examples, the UE may perform the second LBT process based at least in part on the LBT state at the end of the first LBT process. For example, when the first LBT priority level and the second LBT priority level are the same LBT priority level, the UE may initialize the second LBT process based at least in part on the LBT state at the end of the first LBT process (e.g., the CCA slot countdown counter used for the second LBT process may be initialized to a reduced value corresponding to the termination value of the CCA slot countdown counter used for the first LBT process (if any)). When the first LBT priority level and the second LBT priority level are different LBT priority levels, the UE may initialize the second LBT process based at least in part on an adjustment to the LBT state at the end of the first LBT priority process (e.g., an adjustment based on the difference between the first LBT priority level and the second LBT priority level). For example, consider a scenario in which the first LBT priority level is lower than the second LBT priority level, the first LBT priority level has an extension time of 3CCA slots (after 16 microseconds) and a countdown counter of 7CCA slots, and the CCA slot countdown counter is interrupted once (leaving an extension time of 2CCA slots). In this scenario, the LBT state associated with the first LBT process can be adjusted to the extension time of the 2CCA slot and the 9CCA slot countdown timer based on the second LBT priority level associated with the extension time of the 2CCA slot. In a scenario where the first LBT priority level is higher than the second LBT priority level, the UE can track how many CCA slots are successfully cleared after each extension time (e.g., by tracking the CCA clearing rate in each CCA slot).

[0205] When a transmission opportunity (TxOP) includes a downlink TTI and an uplink TTI, the contention window size used by the network access device to compete for access to the shared radio frequency spectrum band may be determined (e.g., initialized, adjusted, reset) based at least in part on feedback (e.g., physical downlink shared channel (PDSCH) HARQ ACK / NACK feedback) for a downlink reference TTI of the TxOP received from one or more UEs. Alternatively, the contention window size may be determined based at least in part on feedback (e.g., PDSCH HARQ ACK / NACK feedback) for a downlink reference TTI received from one or more UEs and also at least in part on at least one uplink transmission received in an uplink TTI scheduled in the downlink reference TTI. For example, the contention window size may be based at least in part on the success or failure of decoding at at least one channel scheduled in the uplink TTI. In some examples, the success or failure of decoding at at least one channel may be based at least in part on ACK / NACK feedback for the at least one channel. In some examples, the at least one channel may include PUSCH, PUCCH, or PRACH.

[0206] Before sending a multi-carrier transmission through a shared radio frequency spectrum band, the UE may perform an LBT process for one or more of the multiple carriers allocated for the multi-carrier transmission. In some examples, the UE may receive scheduling information for uplink transmissions to be performed through multiple carriers of the shared radio frequency spectrum band, and may perform a separate LBT process (e.g., a separate Cat 4 LBT process) for each carrier. A separate CCA slot countdown counter may be maintained for each LBT process. In other examples, the UE may perform a separate LBT process (e.g., a separate Cat 4 LBT process) for each carrier on which the UE's uplink transmission is scheduled, and maintain a joint CCA slot countdown counter for each LBT process. In another example, the UE may perform a first type of LBT process (e.g., a Cat 4 LBT process) for one of the multiple carriers on which the UE's uplink transmission is scheduled, and may perform a second type of LBT process for each other carrier in the multiple carriers. In some examples, the second type of LBT process may be associated with a contention window size that is smaller than the first type of LBT process. For example, the second type of LBT process may be associated with a 25 microsecond LBT process. In some examples, the carrier for which the first type of LBT process is performed may be identified at least in part based on an indication received from a network access device. The indication may be received, for example, in an uplink downlink control information (DCI) for the identified carrier or in an uplink DCI for each of the multiple carriers on which the UE is scheduled. When the network access device sends an indication of each carrier on which the UE is scheduled, the UE may be more likely to receive the indication (and conversely, when the network access device sends an indication of a carrier identified only by an indication, the UE may be less likely to receive the indication) (for example, because the UE is more likely to receive an uplink DCI for at least one of the multiple carriers than it may receive an uplink DCI for a specific carrier). In other examples, the carrier for which the first type of LBT process is performed may be independently identified by the UE. In some examples, a UE that does not receive an indication of the network access device for performing the first type of LBT process on it may independently identify the carrier for which the first type of LBT process is performed as a fallback. In all of the above examples, a UE may send a transmission (and in some examples, a multi-carrier transmission) on each of the multiple carriers on which the UE is scheduled and win contention for access.

[0207] In some examples, the UE may use the same energy detection threshold for all types of LBT processes. In other examples, the UE may use different energy detection thresholds for different types of LBT processes (e.g., a first energy detection threshold for a first type of LBT process, and a second energy detection threshold for a second type of LBT process). For example, the UE may perform a 25 μs LBT process using a -72 dBm energy detection threshold (or the same energy detection threshold used by the network access device when performing an LBT process before transmitting on the downlink), and may perform a Cat 4 LBT process using a different (e.g., lower) energy detection threshold (e.g., an energy detection threshold lower than -72 dBm).

[0208] In some examples, the UE may start performing the LBT process when receiving an uplink grant or in the next TTI after receiving the uplink grant or at the next symbol period boundary or the next CCA slot boundary after receiving the uplink grant. In some examples, the UE may start performing the LBT process regardless of whether the UE is currently receiving a transmission. In other examples, the UE may be prohibited from performing the LBT process when the UE is receiving a transmission (e.g., from a network access device or another device), or be prohibited from updating a countdown timer associated with performing the LBT process. The UE may also or alternatively be prohibited from performing the LBT process or updating a countdown timer associated with performing the LBT process during a TTI in which the UE receives a transmission (e.g., from a network access device or another device). For example, the UE may receive (e.g., from a network access device) an indication that the UE may not update a countdown counter associated with performing the LBT process during a TTI in which the UE receives a transmission. When the UE then determines that the UE is receiving a transmission during the TTI, the UE may avoid at least one of: performing an LBT procedure during the TTI, updating a countdown counter associated with performing the LBT procedure, or a combination thereof. In some examples, avoiding updating the countdown counter may include updating the countdown counter during the TTI, but rolling back the countdown counter so that the value of the countdown counter at the end of the TTI is the same as the value of the countdown counter at the beginning of the TTI. In some examples, an indication that the UE may not update the countdown counter may be received in RRC signaling, a system information block (SIB), a DCI, or a combination thereof.

[0209] In some examples, frequency resources may be allocated to the PUSCH in an interleaved set. For example, a set of 100 resource blocks (RBs) across the system bandwidth may be divided into 10 interleavings, where 10 non-adjacent RBs in the frequency domain are allocated to each interleaving. When multiple interleavings are allocated to the PUSCH, the interleavings are allocated in a plurality of ways. For example, a bitmap may include one bit per interleaving (i.e., 10 bits in total), and the bit corresponding to the interleaving may be set when the interleaving is allocated and cleared when the interleaving is not allocated. Alternatively, a resource indication value (RIV) may be used to allocate multiple interleavings to the PUSCH. The RIV for allocating one or more of the 10 interleavings to the PUSCH may include 6 bits, which may indicate the number of interleavings that are allocated to the PUSCH and the first interleavings that are adjacent to the first interleaving. Alternatively, multiple interleavings may be allocated to the PUSCH using an extended length RIV. The extended length RIV may include one or more additional bits that enable the allocation of some customized interleaving combinations to the PUSCH. The customized staggered combination may include a staggered combination of allocations of PUCCH or PRACH that are expected to overlap with PUSCH in the frequency domain.

[0210] When resources are allocated to PUCCH or PRACH in the frequency domain that overlap with resources allocated to PUSCH, or when a customized staggered combination is allocated to PUSCH, the modulation and coding scheme (MCS) used for PUSCH can be rate matched near PUCCH or PRACH. PUSCH can also be rate matched near SRS. However, in the case of a multi-TTI grant in which the MCS for all TTIs in a TTI is indicated in the grant, the MCS cannot be rate matched near signals sent in different channels or in different TTIs. In some examples, one or more MCS offsets can be signaled to the UE to achieve rate matching near a channel or signal that reduces the number of resource elements (REs) available for transmission of PUSCH in a TTI. In some examples, one or more TBS offsets or other transmission parameters can be signaled to the UE in addition or alternatively.

[0211] In one example, a network access device may send (and a UE may receive) an indication of a transmission parameter (e.g., MCS or TBS) for uplink transmission to be performed over a shared radio frequency spectrum band during at least one TTI. The UE may identify the content of the uplink transmission in each TTI, and may optionally scale the received transmission parameter (e.g., MCS or TBS) for a TTI having content that is different (or sufficiently different) from the nominal content of the TTI. In some examples, the nominal content of the TTI may include a PUSCH, and the content of the TTI for which the transmission parameter may be scaled may, for example, include at least one of the following: the number of REs that is different (or sufficiently different) from the number of REs in the nominal content, the number of punctured symbol periods (e.g., for LBT processes, transmission of SRS, etc.), PUCCH, PRACH, SRS, or a combination thereof. Upon identifying a TTI having content that is different (or sufficiently different) from the nominal content of the TTI, the UE may scale the transmission parameter for the identified TTI. In some examples, scaling the transmission parameter may include switching to a fixed alternative transmission parameter. In some examples, scaling the transmission parameters may include calculating an alternative transmission parameter based at least in part on comparing the identified content to the nominal content.When performing retransmissions of the PUSCH, the UE may or may not scale the transmission parameters, or may or may not scale the transmission parameters in the same manner.

[0212] In some examples, HARQ ACK feedback for a PDSCH received on a carrier in a shared radio frequency spectrum band may be sent on a PUCCH on a carrier in a dedicated radio frequency spectrum band. When the PUCCH sent on a carrier in a dedicated radio frequency spectrum band is unavailable, the HARQ ACK feedback may be delayed to be sent to a network access device. In some examples, it may be undesirable to send or receive HARQ ACK feedback on a carrier in a shared radio frequency spectrum band. In other examples, it may not be undesirable to send or receive HARQ ACK feedback on a carrier in a shared radio frequency spectrum band. Therefore, in some examples, a network access device may send a configuration to a UE for reporting HARQ ACK feedback for a carrier in a shared radio frequency spectrum band. In some examples, the configuration may include a configuration in one of the following modes: a first mode in which the UE sends HARQ ACK feedback on a PUCCH on a carrier in a dedicated radio frequency spectrum band or a second mode in which the UE selects to send HARQ ACK feedback on a PUCCH on a carrier in a dedicated radio frequency spectrum band or on a PUSCH on a carrier for which HARQ ACK feedback is provided. The configuration for reporting HARQ ACK feedback may be sent, for example, using RRC signaling.

[0213] In some examples, the UE may report periodic CSI for a first carrier in a shared RF spectrum band on a second carrier in a dedicated RF spectrum band, and may be prohibited from reporting periodic CSI for the first carrier on the first carrier (or on a PUSCH on the first carrier). In some examples, the UE may report non-periodic CSI for carriers in the dedicated RF spectrum band and carriers in the shared RF spectrum band on a carrier in the shared RF spectrum band, wherein the non-periodic CSI is abandoned when the UE does not win the competition for access to the shared RF spectrum band within the TTI in which the non-periodic CSI is to be reported. The non-periodic CSI may also be abandoned when the TTI in which the non-periodic CSI is to be reported does not include a PUSCH on which the non-periodic CSI is to be reported. To enable the UE to transmit non-periodic CSI without a PUSCH, the network access device may, in some examples, send an indication to the UE of an invalid PUSCH resource allocation for a TTI through the shared RF spectrum band. Invalid PUSCH resource allocation may signal to the UE that although PUSCH is not scheduled in the TTI, the UE may send non-periodic CSI in the TTI. In some examples, the invalid PUSCH resource allocation may include an invalid frequency interlace combination (e.g., 7 interlaces) with a specified bit pattern for the redundancy version (RV) and NDI. In some examples, the network access device may signal a HARQ ID for the transmission of non-periodic CSI without PUSCH. In some examples, the signaled HARQ ID may be considered invalid (i.e., because PUSCH will not be sent in the TTI).

[0214] To trigger the transmission of non-periodic CSI without PUSCH in a TTI transmitted over a shared radio frequency spectrum band, and in a scenario where the TTI is scheduled via a multi-TTI grant, the network access device may indicate to the UE that only the first TTI scheduled via the multi-TTI grant is active. In response to receiving the indication that only the first TTI is active, the UE may transmit non-periodic CSI without PUSCH in the first TTI.

[0215] To trigger the transmission of non-periodic CSI without PUSCH in a TTI transmitted over a shared radio frequency spectrum band, and in a scenario where the TTI is scheduled via a multi-TTI grant, a network access device may send a code point associated with the transmission of non-periodic CSI over a shared radio frequency spectrum band in a TTI scheduled without PUSCH to the UE. When the network access device determines that the UE should transmit non-periodic CSI in a TTI without PUSCH, where the TTI is scheduled via a multi-TTI grant, the network access device may refer to the code point in the multi-TTI grant. The UE may then transmit non-periodic CSI without PUSCH in the TTI based on the code point.

[0216] In some examples, transmission of non-periodic CSI without PUSCH in a TTI that is scheduled in a multi-TTI grant and transmitted over a shared radio frequency spectrum band may not be allowed.

[0217] Before sending a non-periodic SRS without PUSCH in a TTI of a shared radio frequency spectrum band, the UE may perform an LBT process such as a Cat 3 LBT process or a Cat 4 LBT process. In some examples, the UE may perform a Cat 3 LBT process and may select a contention window size for performing the Cat 3 LBT process. In some examples, the contention window size from which the UE may select a contention window size may be limited (e.g., a contention window size limited to 3CCA time slots or 7CCA time slots). In other examples, the UE may perform a Cat 3 LBT process based on a predetermined or signaled contention window size (e.g., a contention window size for 7CCA time slots). In some examples, a delay time associated with a Cat 3 LBT process performed by the UE before sending a non-periodic SRS without PUSCH may be set to a delay time associated with the highest LBT priority level.

[0218] In some examples, the UE may perform a Cat 4 LBT process before sending a non-periodic SRS without PUSCH in a TTI in a shared radio frequency spectrum band. Because there is no ACK / NACK for the SRS transmission, there may not be any information based on which to adjust the contention window size associated with the Cat 4 LBT process. In some examples, the contention window size associated with the Cat 4 LBT process may be randomly adjusted by the UE. In other examples, the contention window size associated with the Cat 4 LBT process may be adjusted by the network access device at least in part based on the expected frequency of SRS requests made by the network access device. In some examples, the determined contention window size may be larger when the network access device expects to make a larger number of SRS requests. The network access device may signal the determined contention window size to the UE in RRC signaling or DCI.

[0219] In some examples, SRS may be triggered in a TTI of a shared RF spectrum band in which PUSCH is scheduled, but because different mechanisms are used to trigger SRS and schedule PUSCH, the scheduling of PUSCH may not leave a gap for sending SRS. For example, SRS may be triggered by a DCI in TTI n, and PUSCH may be scheduled in TTI n by an uplink grant sent / received in an earlier TTI. When the scheduling of PUSCH does not leave a gap for SRS, the UE may send one of the following during the TTI: a PUSCH rate matched around the SRS, PUSCH punctured by the SRS, PUSCH without SRS, or SRS without PUSCH.

[0220] In some examples, a network access device may not allocate resources for sending PRACH over a shared RF spectrum band. For example, in a scenario where there is limited separation between network access devices associated with one or more carriers in a dedicated RF spectrum band and one or more carriers in a shared RF spectrum band (e.g., when the network access devices are in the same timing advance group (TAG)), the UE can operate effectively without PRACH. In other scenarios, the absence of PRACH may make it more difficult for the UE to effectively initialize the timing advance (TA) or uplink transmit power. In these and other scenarios, the network access device may send an indication of a default initial TA for carriers in a shared RF spectrum band. In some examples, the default initial TA may be the TA of a carrier in a dedicated RF spectrum band, where the carrier in the dedicated RF spectrum band is in the same TAG as the carrier in the shared RF spectrum band. Alternatively, the default initial TA may be a static initial TA (e.g., "0").

[0221] The network access device may also send an indication of a default uplink transmit power. In some examples, the default initial transmit power may be the maximum uplink transmit power, and the UE receiving the indication of the maximum uplink transmit power may initially transmit at the maximum uplink transmit power and gradually reduce the uplink transmit power when necessary. In some examples, the default initial transmit power may be included in a code point sent to the UE. For example, in addition to a code point providing an indication of the default uplink transmit power, a plurality of code points indicating different uplink transmit adjustment steps may be sent to the UE. In some examples, an indication of the default uplink transmit power may be sent to the UE in at least one of the following: SIB, RRC configuration, or a combination thereof.

[0222] Figure 5A block diagram 500 of an apparatus 515 for use in wireless communications according to various aspects of the present disclosure is shown. The apparatus 515 may be as described with reference to Figure 1 2 or 2. The device 515 may also be or include a processor. The device 515 may include a receiver 510, a wireless communication manager 520, or a transmitter 530. Each of these components may communicate with each other.

[0223] The components of the device 515 can be implemented individually or collectively using one or more application-specific integrated circuits (ASICs) suitable for performing some or all of the functions applicable in hardware. Alternatively, the functions can be performed by one or more other processing units (or cores) on one or more integrated circuits. In other examples, other types of integrated circuits (e.g., structured / platform ASICs, field programmable gate arrays (FPGAs), single-chip systems (SoCs), and / or other types of semi-custom ICs) that can be programmed in any manner known in the art can be used. The functions of each component can also be implemented in whole or in part using instructions embodied in a memory and formatted to be executed by one or more general or special processors.

[0224] In some examples, the receiver 510 may include at least one radio frequency (RF) receiver, such as at least one RF receiver operable to receive transmissions via a dedicated RF spectrum band (e.g., an RF spectrum band licensed to a specific user for a specific purpose) or a shared RF spectrum band (e.g., an RF spectrum band available for use by Wi-Fi, an RF spectrum band available for use by different wireless access technologies, or an RF spectrum band available for use by multiple MNOs in an equally shared or prioritized manner). In some examples, a dedicated RF spectrum band or a shared RF spectrum band may be used, for example, to Figure 1 , 2 , 3 or 4 described LTE / LTE-A communication. The receiver 510 can be used to communicate with the LTE / LTE-A receiver by, for example, Figure 1 2 or 3 to receive various types of data or control signals (i.e., "data" or transmissions) via one or more communication links of a wireless communication system such as one or more communication links of the wireless communication system 100 or 200 described in connection with FIG. 2. The communication link may be established via a dedicated radio frequency spectrum band or a shared radio frequency spectrum band.

[0225] In some examples, transmitter 530 may include at least one RF transmitter such as at least one RF transmitter operable to transmit over a dedicated RF spectrum band or a shared RF spectrum band. Transmitter 530 may be used to transmit over a dedicated RF spectrum band such as as described in reference Figure 1The communication link may be established via a dedicated radio frequency spectrum band or a shared radio frequency spectrum band.

[0226] In some examples, wireless communication manager 520 can be used to manage one or more aspects of wireless communication of device 515. In some examples, portions of wireless communication manager 520 can be incorporated into or shared with receiver 510 or transmitter 530. In some examples, wireless communication manager 520 can include a downlink transmission reception manager 535, a spectrum contention manager 540, a BSR manager 545, an SRS manager 550, a CSI manager 555, an uplink transmission manager 560, or a HARQ manager.

[0227] The downlink transmission reception manager 535 may be used, for example, to receive and process downlink transmissions, such as described in reference to Fig.13 Or as described in 21.

[0228] The spectrum contention manager 540 can, for example, be used to configure or assist in configuring one or more types of LBT processes to be performed by the device 515 to compete for access to a shared radio frequency spectrum band (e.g., to a channel of a shared radio frequency spectrum band), as described, for example, with reference to Fig.10 , 11 , 14, 15, 16, 18, 20 or 21 described.

[0229] The BSR manager 545 may be used, for example, to configure and send one or more types of BSRs, such as those described in reference to Fig.14 Or as described in 15.

[0230] The SRS manager 550 may be used, for example, to allocate resources for SRS transmissions and to send SRS transmissions, including aperiodic SRS transmissions, such as reference Fig.29 Descriptive.

[0231] The CSI manager 555 may be used, for example, to capture and send CSI transmissions including non-periodic CSI transmissions, such as reference Fig.25 Or as described by 27.

[0232] The uplink transmission manager 560 may be used, for example, to receive scheduling information for uplink transmissions and to send uplink transmissions, as described, for example, with reference to Fig.10 , 11 , 12, 16, 18, 22, 27, 29 or 30 described.

[0233] The HARQ manager may be used, for example, to manage the HARQ process (eg, sending HARQ feedback, processing HARQ feedback, performing HARQ retransmissions, etc.), as described, for example, with reference to Fig.11 , 23 Or 25 described.

[0234] Figure 6 A block diagram 600 of an apparatus 605 for use in wireless communications according to various aspects of the present disclosure is shown. The apparatus 605 may be as described with reference to Figure 1 The apparatus 605 may also be or include a processor. The apparatus 605 may include a receiver 610, a wireless communication manager 620, or a transmitter 630. Each of these components may communicate with each other.

[0235] The components of device 605 may be implemented individually or collectively using one or more ASICs adapted to perform some or all of the functions applicable in hardware. Alternatively, the functions may be performed by one or more other processing units (or cores) on one or more integrated circuits. In other examples, other types of integrated circuits (e.g., structured / platform ASICs, FPGAs, SoCs, and / or other types of semi-custom ICs) that may be programmed in any manner known in the art may be used. The functions of each component may also be implemented in whole or in part using instructions embodied in a memory and formatted to be executed by one or more general or special processors.

[0236] In some examples, receiver 610 may include at least one RF receiver such as at least one RF receiver operable to receive transmissions via a dedicated RF spectrum band (e.g., a RF spectrum band licensed to a specific user for a specific purpose) or a shared RF spectrum band (e.g., a RF spectrum band available for use by Wi-Fi, a RF spectrum band available for use by different wireless access technologies, or a RF spectrum band available for use by multiple MNOs in an equally shared or prioritized manner). In some examples, a dedicated RF spectrum band or a shared RF spectrum band may be used, for example, to Figure 1 , 2 , 3 or 4 described LTE / LTE-A communication. The receiver 610 can be used to communicate with the LTE / LTE-A receiver as described in reference Figure 1 One or more communication links of a wireless communication system such as one or more communication links of the wireless communication system 100 or 200 described in or 2 receive various types of data or control signals (i.e., "data" or transmissions). The communication link can be established through a dedicated radio frequency spectrum band or a shared radio frequency spectrum band.

[0237] In some examples, transmitter 630 may include at least one RF transmitter such as at least one RF transmitter operable to transmit over a dedicated RF spectrum band or a shared RF spectrum band. Transmitter 630 may be used to transmit over a dedicated RF spectrum band such as as described in reference Figure 1 One or more communication links of a wireless communication system such as one or more communication links of the wireless communication system 100 or 200 described in or 2 transmit various types of data or control signals (i.e., "data" or transmissions). The communication link can be established through a dedicated radio frequency spectrum band or a shared radio frequency spectrum band.

[0238] In some examples, the wireless communication manager 620 can be used to manage one or more aspects of wireless communication of the device 605. In some examples, portions of the wireless communication manager 620 can be incorporated into or shared with the receiver 610 or the transmitter 630. In some examples, the wireless communication manager 620 can include a network access device spectrum contention manager 635, a UE spectrum contention manager 640, a HARQ manager 645, an SRS manager 650, a CSI manager 655, or an uplink transmission manager 660.

[0239] The network access device spectrum contention manager 635 can, for example, be used to configure and execute one or more types of LBT processes to compete for access to a shared RF spectrum band (e.g., to a channel of a shared RF spectrum band), as described, for example, with reference to Fig.17 Descriptive.

[0240] The UE spectrum contention manager 640 can, for example, be used to configure or assist in configuring one or more types of LBT processes to be performed by the UE to compete for access to a shared radio frequency spectrum band (e.g., a channel of a shared radio frequency spectrum band), as described, for example, in reference to Fig. 9 , 19 Or as described in 28.

[0241] The HARQ manager 645 may be used, for example, to manage the HARQ process (eg, to allocate HARQ resources, to send HARQ feedback, to process HARQ feedback, to initiate HARQ retransmissions, etc.), as described, for example, with reference to Fig.17 Or 24 described.

[0242] The SRS manager 650 may be used, for example, to allocate resources for SRS transmissions and to request and / or process SRS transmissions, including non-periodic SRS transmissions, such as reference Fig.28 Descriptive.

[0243] The CSI manager 655 may be used, for example, to allocate resources for CSI transmissions and to request and / or process CSI transmissions, including non-periodic CSI transmissions, such as reference Fig.26 Described.

[0244] The uplink transmission manager 660 may be used, for example, to schedule and receive uplink transmissions, as described, for example, in reference to Fig.19 Or as described in 26.

[0245] Figure 7 A block diagram 700 of a UE 715 for use in wireless communications according to various aspects of the present disclosure is shown. The UE 715 may be included or part of a personal computer (e.g., a laptop computer, a netbook computer, a tablet computer, etc.), a cellular phone, a PDA, a DVR, an Internet appliance, a game console, an e-reader, etc. The UE 715 may have an internal power source (not shown) such as a small battery to facilitate mobile operation in some examples. In some examples, the UE 715 may be as described in reference to Figure 1 or aspects of one or more of the UEs 115, 215, 215-a, or 215-b described in 2 or as described in reference Figure 5 UE 715 may be configured to implement the aspects of the apparatus 515 described in the reference Figure 1 , 2 , 3, 4 or 5 described at least some of the UE or device technologies and functions.

[0246] The UE 715 may include a UE processor 710, a UE memory 720, at least one UE transceiver (represented by a UE transceiver 730), at least one UE antenna (represented by a UE antenna 740), or a UE wireless communication manager 750. Each of these components may communicate with each other directly or indirectly via one or more buses 735.

[0247] The UE memory 720 may include a random access memory (RAM) or a read-only memory (ROM). The UE memory 720 may store a computer-readable, computer-executable code 725 containing instructions, which are configured to cause the UE processor 710 to perform various functions related to wireless communication described herein when executed, such as: determining a contention window size for performing an LBT process on a shared radio frequency spectrum band, sending an uplink transmission through a shared radio frequency spectrum band, sending non-periodic CSI for a carrier transmitted through a shared radio frequency spectrum band, sending SRS through a carrier transmitted through a shared radio frequency spectrum band, etc. Alternatively, the computer executable code 725 may not be directly executable by the UE processor 710, but is configured to cause the UE 715 (e.g., when compiled and executed) to perform various functions among the functions described herein.

[0248] The UE processor 710 may include an intelligent hardware device such as a central processing unit (CPU), a microcontroller, an ASIC, etc. The UE processor 710 may process information received through the UE transceiver 730 or information to be sent to the UE transceiver 730 for transmission through the UE antenna 740. The UE processor 710 may handle various aspects of communicating (or managing the communication) through a dedicated radio frequency spectrum band or a shared radio frequency spectrum band, either independently or in conjunction with the UE wireless communication manager 750.

[0249] The UE transceiver 730 may include a modem configured to modulate packets and provide the modulated packets to the UE antenna 740 for transmission, and to demodulate packets received from the UE antenna 740. The UE transceiver 730 may be implemented in some examples as one or more UE transmitters and one or more separate UE receivers. The UE transceiver 730 may support communications in a dedicated radio frequency spectrum band or a shared radio frequency spectrum band. The UE transceiver 730 may be configured to communicate with a reference signal such as a reference signal via the UE antenna 740. Figure 1 or one or more of the base stations 105, 205 or 205-a described in 2 or as described in reference Figure 6 One or more network access devices, base stations, or devices such as one or more of the described devices 605 communicate bidirectionally. Although the UE 715 may include a single UE antenna, there may be examples where the UE 715 may include multiple UE antennas 740.

[0250] The UE wireless communication manager 750 may be configured to execute or control as described in reference Figure 1 , 2, 3, 4 or 5 involving wireless communications via dedicated RF spectrum bands or shared RF spectrum bands. For example, the UE wireless communication manager 750 may be configured to support a supplemental downlink mode (e.g., a licensed assisted access mode), a carrier aggregation mode (e.g., an enhanced licensed assisted access mode), or an independent mode using a dedicated RF spectrum band or a shared RF spectrum band. The UE wireless communication manager 750 may include a UE LTE / LTE-A component for a dedicated RF band 755 configured to handle LTE / LTE-A communications in a dedicated RF spectrum band and a UE LTE / LTE-A component for a shared RF band 760 configured to handle LTE / LTE-A communications in a shared RF spectrum band. The UE wireless communication manager 750 or a portion thereof may include a processor, or some or all of the functions of the UE wireless communication manager 750 may be performed by the UE processor 710 or in combination with the UE processor 710. In some examples, the UE wireless communication manager 750 may be as described in reference Figure 5 An example of a wireless communication manager 520 is described.

[0251] Figure 8 A block diagram 800 of a base station 805 for use in wireless communications is shown in accordance with various aspects of the present disclosure. In some examples, the base station 805 may be as described in reference Figure 1 or one or more aspects of base station 105, 205, or 205-a as described in reference 2 or as described in reference Figure 6 The base station 805 may be configured to implement or facilitate the Figure 1 , 2 , 3, 4 or 6 described at least some of the base station or device technologies and functions.

[0252] The base station 805 may include a base station processor 810, a base station memory 820, at least one base station transceiver (represented by base station transceiver 850), at least one base station antenna (represented by base station antenna 855), or a base station wireless communication manager 860. The base station 805 may also include one or more of a network access device communicator 830 or a network communicator 840. Each of these components may communicate with each other directly or indirectly via one or more buses 875.

[0253] The base station memory 820 may include RAM or ROM. The base station memory 820 may store a computer-readable, computer-executable code 825 containing instructions, which are configured to cause the base station processor 810 to perform various functions related to wireless communication described herein when executed, such as: determining a contention window size for performing an LBT process on a shared radio frequency spectrum band, sending an uplink transmission through a shared radio frequency spectrum band, receiving non-periodic CSI for a carrier transmitted through a shared radio frequency spectrum band, receiving SRS through a carrier transmitted through a shared radio frequency spectrum band, etc. Alternatively, the computer executable code 825 may not be directly executable by the base station processor 810, but is configured to cause the base station 805 (e.g., when compiled and executed) to perform various functions among the functions described herein.

[0254] The base station processor 810 may include an intelligent hardware device, such as a CPU, a microcontroller, an ASIC, etc. The base station processor 810 may process information received through the base station transceiver 850, the network access device communicator 830, or the network communicator 840. The base station processor 810 may also process information to be sent to the transceiver 850 for transmission through the antenna 855, to be sent to the network access device communicator 830 for transmission to one or more other network access devices (e.g., base station 805-a and / or base station 805-b), or to be sent to the network communicator 840 for transmission to the core network 845, which may be as described in reference. Figure 1 An example of one or more aspects of the core network 130 described herein. The base station processor 810 may independently or in conjunction with the base station wireless communication manager 860 handle various aspects of communicating (or managing) over a dedicated radio frequency spectrum band or a shared radio frequency spectrum band.

[0255] The base station transceiver 850 may include a modem configured to modulate packets and provide the modulated packets to the base station antenna 855 for transmission, and to demodulate packets received from the base station antenna 855. The base station transceiver 850 may be implemented in some examples as one or more base station transmitters and one or more separate base station receivers. The base station transceiver 850 may support communications in a dedicated radio frequency spectrum band or a shared radio frequency spectrum band. The base station transceiver 850 may be configured to communicate with a reference signal such as a reference signal via the base station antenna 855. Figure 1 or one or more of the UEs 115, 215, 215-a, or 215-b described in 2 or as described in reference Figure 5The base station 805 may communicate bidirectionally with one or more UEs or devices such as one or more devices in the described device 515. The base station 805 may include, for example, multiple base station antennas 855 (e.g., antenna arrays). The base station 805 may communicate with the core network 845 via a network communicator 840. The base station 805 may also communicate with other network access devices such as the base station 805-a and / or the base station 805-b using a network access device communicator 830.

[0256] The base station wireless communication manager 860 may be configured to execute or control the Figure 1 , 2 , 3, 4, or 6, involving wireless communications over dedicated radio frequency spectrum bands or shared radio frequency spectrum bands. For example, the base station wireless communication manager 860 may be configured to support a supplemental downlink mode (e.g., a licensed assisted access mode), a carrier aggregation mode (e.g., an enhanced licensed assisted access mode), or an independent mode using a dedicated radio frequency spectrum band or a shared radio frequency spectrum band. The base station wireless communication manager 860 may include a base station LTE / LTE-A component for a dedicated RF band 865 configured to handle LTE / LTE-A communications in a dedicated radio frequency spectrum band and a base station LTE / LTE-A component for a shared RF band 870 configured to handle LTE / LTE-A communications in a shared radio frequency spectrum band. The base station wireless communication manager 860 or a portion thereof may include a processor, or some or all of the functions of the base station wireless communication manager 860 may be performed by the base station processor 810 or in combination with the base station processor 810. In some examples, the base station wireless communication manager 860 may be as described in reference Figure 6 An example of a wireless communication manager 620 is described.

[0257] Fig. 9 1 is a flow chart illustrating an example of a method 900 for wireless communication at a network access device according to various aspects of the present disclosure. Figure 1 , 2 or aspects of one or more of the base stations 105, 205, 205-a, or 805 described in reference 8 or as described in reference Figure 6 The described aspects of the apparatus 605 describe the method 900. In some examples, the network access device may execute one or more code sets to control the functional units of the network access device to perform the functions described below. Additionally or alternatively, the network access device may use dedicated hardware to perform one or more of the functions described below.

[0258] At block 905, method 900 may include detecting a first reference signal received from a UE in a reference scheduled transmission burst including a plurality of consecutive TTIs received over a shared radio frequency spectrum band. Figure 6 The wireless communication manager 620 described in reference Figure 8 Base station wireless communication manager 860 as described or as referenced Figure 6 The depicted UE spectrum contention manager 640 performs the operations at block 905 .

[0259] At block 910, method 900 may include identifying a reference TTI in which a first reference signal is received. Figure 6 The wireless communication manager 620 described in reference Figure 8 Base station wireless communication manager 860 as described or as referenced Figure 6 The depicted UE spectrum contention manager 640 performs the operations at block 910 .

[0260] At block 915, method 900 may include determining a contention window size that may be used by UEs to contend for access to a shared radio frequency spectrum band. The determined contention window size is based at least in part on triggering of a non-periodic CSI without PUSCH on a reference TTI, decoding of a PUCCH with CRC scheduled in a reference TTI, decoding of a random access preamble scheduled on a PRACH in a reference TTI, decoding of a first scheduled uplink transmission associated with a random access procedure and received in a reference TTI, or a combination thereof. The contention window size may be determined using a reference TTI such as the one described above. Figure 6 The wireless communication manager 620 described in reference Figure 8 Base station wireless communication manager 860 as described or as referenced Figure 6 The depicted UE spectrum contention manager 640 performs the operations at block 915 .

[0261] At block 920, method 900 may include sending an indication of the determined contention window size to the UE. Figure 6 The wireless communication manager 620 described in reference Figure 8 Base station wireless communication manager 860 as described or as referenced Figure 6 The depicted UE spectrum contention manager 640 performs the operations at block 920 .

[0262] Fig.10 1 is a flow chart illustrating an example of a method 1000 for wireless communication at a UE according to various aspects of the present disclosure. Figure 1 , 2or aspects of one or more of the UEs 115, 215, 215-a, 215-b, or 715 described in reference 7 or as described in reference Figure 5 The described aspects of the apparatus 515 describe the method 1000. In some examples, the UE may execute one or more code sets to control the functional units of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform one or more of the functions described below.

[0263] At box 1005, method 1000 may include: receiving (e.g., from a network access device) at least one uplink grant from a plurality of uplink grants for a reference scheduled transmission burst including a plurality of consecutive TTIs transmitted via a shared radio frequency spectrum band. At least a first uplink grant from the plurality of uplink grants may include: a first indication that the first uplink grant is associated with a first scheduled TTI of the reference scheduled transmission burst, a second indication of a position of the first scheduled TTI within the reference scheduled transmission burst, or a combination thereof. In some examples, each uplink grant for the reference scheduled transmission burst may include an indication of the position of the first scheduled TTI of the reference scheduled transmission burst. The reference may be used as Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted uplink transmission manager 560 performs the operations at block 1005 .

[0264] At block 1010, method 1000 may include transmitting (e.g., to a network access device) during at least one TTI of a reference scheduled transmission burst in accordance with at least one uplink grant. The transmission may begin during a first transmission TTI. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted uplink transmission manager 560 performs the operations at block 1010 .

[0265] At block 1015, method 1000 may include receiving an indication of a reference TTI (e.g., from a network access device). The reference TTI may be used for transmissions performed by the UE during a reference scheduled transmission burst. In some examples, the indication of the reference TTI may be relative to a first scheduled TTI. The reference TTI may be used as Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5The depicted uplink transmission manager 560 performs the operations at block 1015 .

[0266] At block 1020, method 1000 may include determining a contention window size that may be used by the UE to contend for access to the shared radio frequency spectrum band. The contention window size may be determined based at least in part on a relationship between the first scheduled TTI, the reference TTI, and the first transmission TTI. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted spectrum contention manager 540 performs the operations at block 1020 .

[0267] Fig.11 1 is a flowchart illustrating an example of a method 1100 for wireless communication at a UE according to various aspects of the present disclosure. Figure 1 , 2 or aspects of one or more of the UEs 115, 215, 215-a, 215-b, or 715 described in reference 7 or as described in reference Figure 5 The described aspects of the apparatus 515 describe the method 1100. In some examples, the UE may execute one or more code sets to control the functional units of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform one or more of the functions described below.

[0268] At block 1105, method 1100 may include transmitting a reference scheduled transmission burst comprising a plurality of consecutive TTIs via a shared radio frequency spectrum band. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted uplink transmission manager 560 performs the operations at block 1105 .

[0269] At block 1110, method 1100 may include identifying a HARQ process corresponding to a reference TTI. The reference TTI may be a first TTI of a plurality of TTIs for which a HARQ acknowledgment is received. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted HARQ manager 565 performs the operations at block 1110 .

[0270] At block 1115, method 1100 may include identifying an instance of a HARQ process associated with a TTI following a reference TTI. The instance of the HARQ process may be identified based at least in part on whether the TTI is included in a reference scheduled transmission burst or a subsequent transmission burst, whether the TTI includes non-periodic CSI without PUSCH, or a combination thereof. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted HARQ manager 565 performs the operations at block 1115 .

[0271] At block 1120, method 1100 may include determining a contention window size that may be used by the UE to contend for access to the shared radio frequency spectrum band. The contention window size may be determined based at least in part on a state of the NDI associated with the identified instance of the HARQ process. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted spectrum contention manager 540 performs the operations at block 1120 .

[0272] Fig.12 1 is a flow chart illustrating an example of a method 1200 for wireless communication at a UE according to various aspects of the present disclosure. Figure 1 , 2 or aspects of one or more of the UEs 115, 215, 215-a, 215-b, or 715 described in reference 7 or as described in reference Figure 5 The described aspects of the apparatus 515 describe the method 1200. In some examples, the UE may execute one or more code sets to control the functional units of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform one or more of the functions described below.

[0273] At block 1205, method 1200 may include receiving in the CPDCCH a first indication of a RCOT within which a network access device may access a shared radio frequency spectrum band and a second indication of a pause time during which the network access device will not transmit over the shared radio frequency spectrum band. In some examples, the RCOT may include a pause time. In some examples, the RCOT may not include a pause time. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5The depicted uplink transmission manager 560 performs the operations at block 1205 .

[0274] At block 1210, method 1200 may include determining, based at least in part on the RCOT, whether a size of an uplink transmission of the UE allows the UE to send the uplink transmission within an MCOT in which a network access device can access a shared radio frequency spectrum band. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted uplink transmission manager 560 performs the operations at block 1210 .

[0275] At block 1215, method 1200 may include entering a power saving mode during at least a portion of the pause time. Figure 5 The wireless communication manager 520 described or as referenced Figure 7 The depicted UE wireless communication manager 750 performs the operations at block 1215 .

[0276] Fig.13 1 is a flowchart illustrating an example of a method 1300 for wireless communication at a UE according to various aspects of the present disclosure. Figure 1 , 2 or aspects of one or more of the UEs 115, 215, 215-a, 215-b, or 715 described in reference 7 or as described in reference Figure 5 The described aspects of the apparatus 515 describe the method 1300. In some examples, the UE may execute one or more code sets to control the functional units of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform one or more of the functions described below.

[0277] At box 1305, method 1300 may include: receiving an indication of a downlink-uplink TTI configuration starting with the downlink TTI in a downlink TTI of a scheduled transmission burst received via a shared radio frequency spectrum band. The downlink-uplink configuration may include some upcoming downlink TTIs, some uplink TTIs, or a combination thereof. In some examples, method 1300 may also include: receiving at least one of the following in the downlink TTI: a second indication of the duration of the downlink TTI, a third indication of the duration of the uplink TTI, or a combination thereof. In some examples, the downlink TTI may include a downlink subframe, and the downlink-uplink TTI configuration may include a downlink-uplink subframe configuration. The method 1300 may be used as described in reference Figure 5The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The operations at block 1305 are performed by the downlink transmission reception manager 535 as described herein.

[0278] At block 1310, method 1300 may include determining a timing of a next downlink TTI in a scheduled transmission burst based at least in part on a downlink-uplink TTI configuration starting with a downlink TTI. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted downlink transmission reception manager 535 performs the operations at block 1310 .

[0279] At block 1315, the method 1300 may optionally include receiving, in each of at least one additional downlink TTI in which the transmission burst is scheduled, an additional indication of an additional downlink-uplink TTI configuration following the additional downlink TTI. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted downlink transmission reception manager 535 performs the operations at block 1315 .

[0280] Fig.14 1 is a flowchart illustrating an example of a method 1400 for wireless communication at a UE according to various aspects of the present disclosure. Figure 1 , 2 or aspects of one or more of the UEs 115, 215, 215-a, 215-b, or 715 described in reference 7 or as described in reference Figure 5 The described aspects of the apparatus 515 describe the method 1400. In some examples, the UE may execute one or more code sets to control the functional units of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform one or more of the functions described below.

[0281] At block 1405, method 1400 may include sending a type of BSR. The type of BSR may include an indication of the amount of data to be sent for each of a plurality of LBT priority levels. Figure 5 The wireless communication manager 520 described in reference Figure 7UE wireless communication manager 750 as described or as referenced Figure 5 The BSR manager 545 is depicted as performing the operations at block 1405 .

[0282] At block 1410, method 1400 may include, in response to sending the type of BSR, receiving from a network access device an indication of an LBT priority level boundary and an indication of an LBT priority level to be used by the UE when contending for access to the shared radio frequency spectrum band. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted spectrum contention manager 540 performs the operations at block 1410 .

[0283] At block 1415, method 1400 may include selecting an LBT priority level based at least in part on the type of data to be transmitted via the shared radio frequency spectrum band and an LBT priority level boundary. In some examples, the LBT priority level boundary may include at least one of the following: a highest LBT priority level that can be used by the UE, a lowest LBT priority level that can be used by the UE, or a combination thereof. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted spectrum contention manager 540 performs the operations at block 1415 .

[0284] At block 1420, method 1400 may include contending for access to a shared radio frequency spectrum band based at least in part on a selected LBT priority level. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted spectrum contention manager 540 performs the operations at block 1420 .

[0285] Fig.15 1 is a flowchart illustrating an example of a method 1500 for wireless communication at a UE according to various aspects of the present disclosure. Figure 1 , 2 or aspects of one or more of the UEs 115, 215, 215-a, 215-b, or 715 described in reference 7 or as described in reference Figure 5The described aspects of the apparatus 515 describe the method 1500. In some examples, the UE may execute one or more code sets to control the functional units of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform one or more of the functions described below.

[0286] At block 1505, method 1500 may include sending a first type of BSR, the first type of BSR including an indication of an amount of data to be sent for each of a plurality of LBT priority levels. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted BSR manager 545 performs the operations at block 1505 .

[0287] At block 1510, method 1500 may include, in response to sending a first type of BSR, receiving from a network access device an indication of an LBT priority level to be used by a UE when contending for access to a shared radio frequency spectrum band. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted spectrum contention manager 540 performs the operations at block 1510 .

[0288] In some examples, method 1500 may include: selecting a first type of BSR from a plurality of BSR types including at least a first type of BSR and a second type of BSR. In some examples, the second type of BSR may include an LTE / LTE-A type of BSR. In some examples, the first type of BSR may be selected from a plurality of BSR types based at least in part on a BSR selection criterion. In some examples, the criterion may include receiving data to be transmitted, wherein the data is associated with an LBT priority level that meets (e.g., exceeds) a threshold LBT priority level.

[0289] Fig.16 1 is a flow chart illustrating an example of a method 1600 for wireless communication at a UE according to various aspects of the present disclosure. Figure 1 , 2 or aspects of one or more of the UEs 115, 215, 215-a, 215-b, or 715 described in reference 7 or as described in reference Figure 5The described aspects of the apparatus 515 describe the method 1600. In some examples, the UE may execute one or more code sets to control the functional units of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform one or more of the functions described below.

[0290] At block 1605, method 1600 may include receiving a first uplink grant for transmission over a shared radio frequency spectrum band. The first uplink grant may be associated with a first LBT priority level. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted uplink transmission manager 560 performs the operations at block 1605 .

[0291] At block 1610, the method 1600 may include: performing a first LBT process to contend for access to a shared radio frequency spectrum band based at least in part on a first LBT priority level. The first LBT process may end at an LBT state. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted spectrum contention manager 540 performs the operations at block 1610 .

[0292] At block 1615, method 1600 may include determining not to transmit over the shared radio frequency spectrum band in accordance with the first uplink grant based at least in part on the LBT state. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted spectrum contention manager 540 performs the operations at block 1615 .

[0293] At block 1620, method 1600 may include receiving a second uplink grant for transmission over the shared radio frequency spectrum band. The second uplink grant may be associated with a second LBT priority level. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted uplink transmission manager 560 performs the operations at block 1620 .

[0294] At box 1625, method 1600 may optionally include: adjusting the LBT state based at least in part on the difference between the first LBT priority level and the second LBT priority level. Accordingly, in some cases, the LBT state can be adjusted at the end of the first LBT process. Additionally or alternatively, a second LBT process can be initialized. In some examples, the operation at box 1625 may include: determining that the first LBT priority level and the second LBT priority level are the same LBT priority level, and initializing the second LBT process based at least in part on the LBT state. In some examples, the operation at box 1625 may include: determining that the first LBT priority level and the second LBT priority level are different LBT priority levels, adjusting the LBT state at the end of the first LBT process based at least in part on the difference between the first LBT priority level and the second LBT priority level, and initializing the second LBT process based at least in part on the adjusted LBT state. The method 1600 may be used as described in reference to FIG. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted spectrum contention manager 540 performs the operations at block 1625 .

[0295] At block 1630, method 1600 may include performing a second LBT process to contend for access to the shared radio frequency spectrum band based at least in part on the second LBT priority level, the first LBT priority level, and the LBT state. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted spectrum contention manager 540 performs the operations at block 1630 .

[0296] Fig.17 1 is a flow chart illustrating an example of a method 1700 for wireless communication at a network access device according to various aspects of the present disclosure. Figure 1 , 2 or aspects of one or more of the base stations 105, 205, 205-a, or 805 described in reference 8 or as described in reference Figure 6 The described aspects of the apparatus 605 describe the method 1700. In some examples, the network access device may execute one or more code sets to control the functional units of the network access device to perform the functions described below. Additionally or alternatively, the network access device may use dedicated hardware to perform one or more of the functions described below.

[0297] At block 1705, method 1700 may include: identifying feedback received from a UE for a downlink reference TTI for a TxOP over a shared radio frequency spectrum band. The TxOP may include at least one downlink TTI and at least one uplink TTI. In some examples, the at least one downlink TTI may include at least one downlink subframe, and the at least one uplink TTI may include at least one uplink subframe. Figure 6 The wireless communication manager 620 described in reference Figure 8 Base station wireless communication manager 860 as described or as referenced Figure 6 The depicted HARQ manager 645 performs the operations at block 1705 .

[0298] At block 1710, method 1700 may include identifying an uplink TTI of a TxOP for which scheduling information is sent in a downlink reference TTI. Figure 6 The wireless communication manager 620 described in reference Figure 8 Base station wireless communication manager 860 as described or as referenced Figure 6 The depicted network access device spectrum contention manager 635 performs the operations at block 1710 .

[0299] At box 1715, method 1700 may include: determining a contention window size for a next TxOP that can be used by a network access device to compete for access to a shared radio frequency spectrum band based at least in part on the identified feedback and the scheduled uplink transmission in the identified uplink TTI. In some examples, determining the contention window size based at least in part on the scheduled uplink transmission in the identified uplink TTI may include determining the contention window size based at least in part on decoding of at least one channel including: a scheduled PUSCH or a scheduled PUCCH or a scheduled PRACH or a combination thereof. In some examples, determining the contention window size based at least in part on decoding of at least one channel may include: determining the contention window size based at least in part on ACK / NACK feedback for the at least one channel. The contention window size may be determined using references such as Figure 6 The wireless communication manager 620 described in reference Figure 8 Base station wireless communication manager 860 as described or as referenced Figure 6 The depicted network access device spectrum contention manager 635 performs the operations at block 1715 .

[0300] Fig.18 1 is a flowchart illustrating an example of a method 1800 for wireless communication at a UE according to various aspects of the present disclosure. Figure 1 ,2 or aspects of one or more of the UEs 115, 215, 215-a, 215-b, or 715 described in reference 7 or as described in reference Figure 5 The described aspects of the apparatus 515 describe the method 1800. In some examples, the UE may execute one or more code sets to control the functional units of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform one or more of the functions described below.

[0301] At block 1805, method 1800 may include receiving scheduling information for uplink transmissions to be performed over multiple carriers in a shared radio frequency spectrum band. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted uplink transmission manager 560 performs the operations at block 1805 .

[0302] At block 1810, method 1800 may include identifying a carrier among a plurality of carriers on which a first type of LBT process is to be performed. In some examples, identifying the carrier may include one of: identifying the carrier based on an indication received from a network access device or independently identifying the carrier. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted spectrum contention manager 540 performs the operations at block 1810 .

[0303] At block 1815, method 1800 may include performing a first type of LBT process for the identified carrier. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted spectrum contention manager 540 performs the operations at block 1815 .

[0304] At block 1820, method 1800 may include performing a second type of LBT process for each of a plurality of carriers other than the identified carrier. The second type of LBT process may have a shorter contention window than the first type of LBT process. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted spectrum contention manager 540 performs the operations at block 1820 .

[0305] At block 1825, method 1800 may include sending an uplink transmission over multiple carriers based at least in part on performing a first type of LBT procedure for the identified carrier and performing a second type of LBT procedure for each carrier different from the identified carrier. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted uplink transmission manager 560 performs the operations at block 1825 .

[0306] Fig.19 1 is a flowchart illustrating an example of a method 1900 for wireless communication at a network access device according to various aspects of the present disclosure. Figure 1 , 2 or aspects of one or more of the base stations 105, 205, 205-a, or 805 described in reference 8 or as described in reference Figure 6 The described aspects of the apparatus 605 describe the method 1900. In some examples, the network access device may execute one or more code sets to control the functional units of the network access device to perform the functions described below. Additionally or alternatively, the network access device may use dedicated hardware to perform one or more of the functions described below.

[0307] At block 1905, method 1900 may include scheduling uplink transmissions to be made by a UE over multiple carriers of a shared radio frequency spectrum band. Figure 6 The wireless communication manager 620 described in reference Figure 8 Base station wireless communication manager 860 as described or as referenced Figure 6 The depicted uplink transmission manager 660 performs the operations at block 1905 .

[0308] At block 1910, method 1900 may include sending to the UE an indication of a single carrier among multiple carriers for which a first type of LBT process is to be performed. In some examples, sending the indication of the single carrier may include sending the indication of the single carrier in an uplink DCI for the single carrier or sending the indication of the single carrier in an uplink DCI for each of the multiple carriers. Figure 6 The wireless communication manager 620 described in reference Figure 8 Base station wireless communication manager 860 as described or as referenced Figure 6 The depicted UE spectrum contention manager 640 performs the operations at block 1910 .

[0309] Fig. 20 2 is a flowchart illustrating an example of a method 2000 for wireless communication at a UE according to various aspects of the present disclosure. Figure 1 , 2 or aspects of one or more of the UEs 115, 215, 215-a, 215-b, or 715 described in reference 7 or as described in reference Figure 5 The described aspects of the apparatus 515 describe the method 2000. In some examples, the UE may execute one or more code sets to control the functional units of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform one or more of the functions described below.

[0310] At block 2005, method 2000 may include identifying a type of LBT process to be performed to contend for access to a shared radio frequency spectrum band. The identified type of LBT process may include a first type of LBT process or a second type of LBT process. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted spectrum contention manager 540 performs the operations at block 2005 .

[0311] At block 2010, method 2000 may include identifying an energy detection threshold associated with the identified type of LBT process, the identified energy detection threshold including a first energy detection threshold for the first type of LBT process or a second energy detection threshold for the second type of LBT process, wherein the first energy detection threshold may be lower than the second energy detection threshold. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted spectrum contention manager 540 performs the operations at block 2010 .

[0312] At block 2015, method 2000 may include: performing the identified type of LBT process to contend for access to the shared radio frequency spectrum band based at least in part on the identified energy detection threshold. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted spectrum contention manager 540 performs the operations at block 2015 .

[0313] Fig.212 is a flowchart illustrating an example of a method 2100 for wireless communication at a UE according to various aspects of the present disclosure. Figure 1 , 2 or aspects of one or more of the UEs 115, 215, 215-a, 215-b, or 715 described in reference 7 or as described in reference Figure 5 The described aspects of the apparatus 515 describe the method 2100. In some examples, the UE may execute one or more code sets to control the functional units of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform one or more of the functions described below.

[0314] At block 2105, method 2100 may include receiving an indication that the UE may not update a countdown counter associated with performing an LBT procedure during a TTI in which the UE receives a transmission. In some examples, the indication that the UE may not update the countdown counter may be received in at least one of the following: RRC signaling, SIB, or DCI. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted spectrum contention manager 540 performs the operations at block 2105 .

[0315] At block 2110, method 2100 may include determining that the UE is receiving a transmission during a TTI. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted downlink transmission reception manager 535 performs the operations at block 2110 .

[0316] At block 2115, method 2100 may include refraining from at least one of: performing an LBT process during a TTI, updating a countdown counter associated with performing an LBT process during a TTI, or a combination thereof. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted spectrum contention manager 540 performs the operations at block 2115 .

[0317] Fig. 22 2 is a flowchart illustrating an example of a method 2200 for wireless communication at a UE according to various aspects of the present disclosure. Figure 1 ,2 or aspects of one or more of the UEs 115, 215, 215-a, 215-b, or 715 described in reference 7 or as described in reference Figure 5 The described aspects of the apparatus 515 describe the method 2200. In some examples, the UE may execute one or more code sets to control the functional units of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform one or more of the functions described below.

[0318] At block 2205, method 2200 may include receiving an indication of transmission parameters for uplink transmissions to be performed over the shared radio frequency spectrum band during at least one TTI. In some examples, the transmission parameters may include at least one of the following: TBS, MCS, or a combination thereof. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted uplink transmission manager 560 performs the operations at block 2205 .

[0319] At block 2210, method 2200 may include identifying content of an uplink transmission in each of at least one TTI. In some examples, the identified content may include at least one of: a plurality of REs, a plurality of punctured symbol periods, a first occurrence of a PUCCH, a second occurrence of a PRACH, a third occurrence of an SRS, or a combination thereof. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted uplink transmission manager 560 performs the operations at block 2210 .

[0320] At block 2215, method 2200 may include scaling transmission parameters for at least the first TTI based at least in part on the identified content of the uplink transmission in the first TTI. In some examples, scaling the transmission parameters may include one of switching to a fixed alternative transmission parameter or calculating an alternative transmission parameter based at least in part on a comparison of the identified content with the nominal content. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted uplink transmission manager 560 performs the operations at block 2215 .

[0321] Fig.232300 is a flowchart illustrating an example of a method 2300 for wireless communication at a UE according to various aspects of the present disclosure. Figure 1 , 2 or aspects of one or more of the UEs 115, 215, 215-a, 215-b, or 715 described in reference 7 or as described in reference Figure 5 The described aspects of the apparatus 515 describe the method 2300. In some examples, the UE may execute one or more code sets to control the functional units of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform one or more of the functions described below.

[0322] At block 2305, method 2300 may include receiving RRC signaling from the network. The RRC signaling may configure HARQ ACK feedback reporting for a first carrier in a shared radio frequency spectrum band in one of the following modes: a first mode in which the UE sends HARQ ACK feedback on a PUCCH on a second carrier in a dedicated radio frequency spectrum band, or a second mode in which the UE selects to send HARQ ACK feedback on either a PUCCH on the second carrier or a PUSCH on the first carrier. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted HARQ manager 565 performs the operations at block 2305 .

[0323] At block 2310, method 2300 may include sending HARQ ACK feedback according to a first mode or a second mode as configured by RRC signaling. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted HARQ manager 565 performs the operations at block 2310 .

[0324] In certain examples of method 2300, RRC signaling may configure HARQ ACK feedback reporting for a first carrier in a second mode, and method 2300 may include: competing for access to a first carrier in a shared radio frequency spectrum band, and sending HARQ ACK feedback on a PUSCH on the first carrier based at least in part on winning the competition for access to the first carrier.

[0325] Fig.24 2400 is a flowchart illustrating an example of a method 2400 for wireless communication at a network access device according to various aspects of the present disclosure. Figure 1 , 2 or aspects of one or more of the base stations 105, 205, 205-a, or 805 described in reference 8 or as described in reference Figure 6 The described aspects of the apparatus 605 describe the method 2400. In some examples, the network access device may execute one or more code sets to control the functional units of the network access device to perform the functions described below. Additionally or alternatively, the network access device may use dedicated hardware to perform one or more of the functions described below.

[0326] At block 2405, method 2400 may include configuring HARQ ACK feedback reporting for a first carrier in a shared radio frequency spectrum band in one of the following modes: a first mode in which the UE sends HARQ ACK feedback on a PUCCH on a second carrier in a dedicated radio frequency spectrum band, or a second mode in which the UE selects to send HARQ ACK feedback on either a PUCCH on the second carrier or a PUSCH on the first carrier. Figure 6 The wireless communication manager 620 described in reference Figure 8 Base station wireless communication manager 860 as described or as referenced Figure 6 The depicted HARQ manager 645 performs the operations at block 2405 .

[0327] At block 2410, method 2400 may include sending an indication of the configured HARQ ACK feedback reporting mode to the UE in RRC signaling. Figure 6 The wireless communication manager 620 described in reference Figure 8 Base station wireless communication manager 860 as described or as referenced Figure 6 The depicted HARQ manager 645 performs the operations at block 2410 .

[0328] At block 2415, method 2400 may include receiving HARQ ACK feedback for the first carrier from the UE according to the configured HARQ ACK feedback reporting mode. Figure 6 The wireless communication manager 620 described in reference Figure 8 Base station wireless communication manager 860 as described or as referenced Figure 6 The depicted HARQ manager 645 performs the operations at block 2415 .

[0329] Fig.25 25 is a flowchart illustrating an example of a method 2500 for wireless communication at a UE according to various aspects of the present disclosure. Figure 1 , 2or aspects of one or more of the UEs 115, 215, 215-a, 215-b, or 715 described in reference 7 or as described in reference Figure 5 The described aspects of the apparatus 515 describe the method 2500. In some examples, the UE may execute one or more code sets to control the functional units of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform one or more of the functions described below.

[0330] At block 2505, method 2500 may include receiving an indication of an invalid PUSCH resource allocation for a TTI over a shared radio frequency spectrum band. In some examples, the invalid PUSCH resource allocation may include an invalid frequency interleaved combination with a specified bit pattern for RV and NDI. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The described CSI manager 555 performs the operations at box 2505.

[0331] At block 2510, method 2500 may include sending aperiodic CSI without PUSCH in a TTI. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The described CSI manager 555 performs the operations at box 2510.

[0332] At block 2515, method 2500 may optionally include interpreting the HARQ ID of the TTI as invalid. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The described HARQ manager 565 performs the operations at box 2515.

[0333] Fig.26 2600 is a flowchart illustrating an example of a method 2600 for wireless communication at a network access device according to various aspects of the present disclosure. Figure 1 , 2 or aspects of one or more of the base stations 105, 205, 205-a, or 805 described in reference 8 or as described in reference Figure 6The described aspects of the apparatus 605 describe the method 2600. In some examples, the network access device may execute one or more code sets to control the functional units of the network access device to perform the functions described below. Additionally or alternatively, the network access device may use dedicated hardware to perform one or more of the functions described below.

[0334] At block 2605, method 2600 may include sending an indication of an invalid PUSCH resource allocation for a TTI over a shared radio frequency spectrum band. In some examples, the invalid PUSCH resource allocation includes an invalid frequency interleaving combination with a specified bit pattern for RV or NDI. Figure 6 The wireless communication manager 620 described in reference Figure 8 Base station wireless communication manager 860 as described or as referenced Figure 6 The depicted uplink transmission manager 660 performs the operations at block 2605 .

[0335] At block 2610, method 2600 may include receiving non-periodic CSI without PUSCH in a TTI. Figure 6 The wireless communication manager 620 described in reference Figure 8 Base station wireless communication manager 860 as described or as referenced Figure 6 The described CSI manager 655 performs the operations at box 2610.

[0336] Fig. 27 2700 is a flowchart illustrating an example of a method 2700 for wireless communication at a UE according to various aspects of the present disclosure. Figure 1 , 2 or aspects of one or more of the UEs 115, 215, 215-a, 215-b, or 715 described in reference 7 or as described in reference Figure 5 The described aspects of the apparatus 515 describe the method 2700. In some examples, the UE may execute one or more code sets to control the functional units of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform one or more of the functions described below.

[0337] At block 2705, method 2700 may include receiving a code point associated with transmitting aperiodic CSI without PUSCH in a scheduled TTI over a shared radio frequency spectrum band. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5The described CSI manager 555 performs the operations at box 2705.

[0338] At block 2710, method 2700 may include receiving a multi-TTI grant that references a codepoint of a TTI scheduled by the multi-TTI grant. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted uplink transmission manager 560 performs the operations at block 2705 .

[0339] At block 2715, method 2700 may include sending aperiodic CSI without PUSCH in a TTI according to a code point. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The described CSI manager 555 performs the operations at box 2705.

[0340] Fig.28 28 is a flowchart illustrating an example of a method 2800 for wireless communication at a network access device according to various aspects of the present disclosure. Figure 1 , 2 or aspects of one or more of the base stations 105, 205, 205-a, or 805 described in reference 8 or as described in reference Figure 6 The described aspects of the apparatus 605 describe the method 2800. In some examples, the network access device may execute one or more code sets to control the functional units of the network access device to perform the functions described below. Additionally or alternatively, the network access device may use dedicated hardware to perform one or more of the functions described below.

[0341] At block 2805, method 2800 may include identifying an expected frequency of SRS requests. Figure 6 The wireless communication manager 620 described in reference Figure 8 Base station wireless communication manager 860 as described or as referenced Figure 6 The depicted SRS manager 650 performs the operations at block 2805 .

[0342] At block 2810, method 2800 may include identifying an aperiodic SRS without PUSCH to be transmitted over a shared radio frequency spectrum band during a TTI. Figure 6 The wireless communication manager 620 described in reference Figure 8Base station wireless communication manager 860 as described or as referenced Figure 6 The depicted SRS manager 650 performs the operations at block 2810 .

[0343] At block 2815, method 2800 may include determining a contention window size to be used by the UE when performing an LBT process to contend for access to a shared radio frequency spectrum band in order to transmit a non-periodic SRS, the determined contention window size being based at least in part on an expected frequency of SRS requests. Figure 6 The wireless communication manager 620 described in reference Figure 8 Base station wireless communication manager 860 as described or as referenced Figure 6 The depicted UE spectrum contention manager 640 performs the operations at block 2815 .

[0344] At block 2820, method 2800 may include sending an indication of the determined contention window size to the UE. In some examples, the indication of the determined contention window size may be sent in RRC signaling. Figure 6 The wireless communication manager 620 described in reference Figure 8 Base station wireless communication manager 860 as described or as referenced Figure 6 The depicted UE spectrum contention manager 640 performs the operations at block 2820 .

[0345] Fig.29 2900 is a flowchart illustrating an example of a method 2900 for wireless communication at a UE according to various aspects of the present disclosure. Figure 1 , 2 or aspects of one or more of the UEs 115, 215, 215-a, 215-b, or 715 described in reference 7 or as described in reference Figure 5 The described aspects of the apparatus 515 describe the method 2900. In some examples, the UE may execute one or more code sets to control the functional units of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform one or more of the functions described below.

[0346] At block 2905, method 2900 may include receiving a trigger in a downlink DCI to transmit an SRS during a TTI. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted SRS manager 550 performs the operations at block 2905 .

[0347] At block 2910, method 2900 may include receiving scheduling information for a PUSCH to be transmitted during a TTI, wherein the scheduling information does not include a gap for transmitting an SRS. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted uplink transmission manager 560 performs the operations at block 2910 .

[0348] At block 2915, method 2900 may include transmitting during the TTI one of: a PUSCH rate matched around the SRS, a PUSCH punctured by the SRS, a PUSCH without the SRS, or an SRS without the PUSCH. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The described uplink transmission manager 560 or SRS manager 550 performs the operations at box 2915.

[0349] Fig.30 3 is a flowchart illustrating an example of a method 3000 for wireless communication at a UE according to various aspects of the present disclosure. Figure 1 , 2 or aspects of one or more of the UEs 115, 215, 215-a, 215-b, or 715 described in reference 7 or as described in reference Figure 5 The described aspects of the apparatus 515 describe the method 3000. In some examples, the UE may execute one or more code sets to control the functional units of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform one or more of the functions described below.

[0350] At block 3005, method 3000 may include receiving a first indication of a default initial timing advance for a first carrier in a shared radio frequency spectrum band. The default initial timing advance may include a timing advance for a second carrier in a dedicated radio frequency spectrum band, wherein the first carrier and the second carrier are in the same TAG; or a static initial timing advance (e.g., a TA of "0"); or a combination thereof. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted uplink transmission manager 560 performs the operations at block 3005 .

[0351] At block 3010, method 3000 may include receiving a second indication of a default initial uplink transmit power. In some examples, the default initial uplink transmit power may be a maximum uplink transmit power. In some examples, the second indication may be received in at least one of: a system information block, an RRC configuration, or a combination thereof. In some examples, method 3000 may include receiving a plurality of code points indicating different uplink transmit power adjustment steps and a code point providing the second indication. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted uplink transmission manager 560 performs the operations at block 3010 .

[0352] At block 3015, method 3000 may include transmitting on a first carrier based at least in part on a default initial timing advance and a default initial uplink transmit power. Figure 5 The wireless communication manager 520 described in reference Figure 7 UE wireless communication manager 750 as described or as referenced Figure 5 The depicted uplink transmission manager 560 performs the operations at block 3015 .

[0353] Fig.31 3100 is a flowchart illustrating an example of a method 3100 for wireless communication at a network access device according to various aspects of the present disclosure. Figure 1 , 2 or aspects of one or more of the base stations 105, 205, 205-a, or 805 described in reference 8 or as described in reference Figure 6 The described aspects of the apparatus 605 describe the method 3100. In some examples, the network access device may execute one or more code sets to control the functional units of the network access device to perform the functions described below. Additionally or alternatively, the network access device may use dedicated hardware to perform one or more of the functions described below.

[0354] At box 3105, method 3100 may include: selecting at least one of the following from a plurality of code points: a first code point for controlling transmit power in a single TTI uplink transmission; a second code point for controlling transmit power in multiple TTI uplink transmissions; a third code point associated with transmitting at maximum transmit power during a single TTI uplink transmission or multiple TTI uplink transmissions; or a combination thereof. The first code point and the second code point may be associated with different transmit powers (e.g., different ranges of transmit power). In some examples of method 3100, the second code point may identify an uplink transmit power adjustment step that is larger than the first code point. The code point may be used as described in reference to FIG. Figure 6 The wireless communication manager 620 described in reference Figure 8 Base station wireless communication manager 860 as described or as referenced Figure 6 The depicted uplink transmission manager 660 performs the operations at block 3105 .

[0355] At block 3110, method 3100 may include sending a transmit power control (TPC) command to the UE. The TPC command may include at least one code point selected at block 3105. Figure 6 The wireless communication manager 620 described in reference Figure 8 Base station wireless communication manager 860 as described or as referenced Figure 6 The depicted uplink transmission manager 660 performs the operations at block 3110 .

[0356] In some examples, the method 3100 may also include scheduling uplink transmissions by the UE, wherein the scheduled uplink transmissions include single TTI uplink transmissions or multiple TTI uplink transmissions. The method 3100 may also include sending an uplink grant to the UE that references the codepoint sent in the TCP command.

[0357] As reference Fig. 9 , 10 , 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, and 31. The methods 900, 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1700, 1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500, 2600, 2700, 2800, 2900, 3000, and 3100 described in the present disclosure illustrate only some of the techniques and some implementations of the techniques described in the present disclosure. In some examples, the techniques from references may be combined. Fig. 9 , 17, 19, 24, 26, 28 and 31 described in two or more of the methods 900, 1700, 2900, 2400, 2600, 2800 or 3100. In some examples, the method described in reference Fig.10 , 11 , 12, 13, 14, 15, 16, 18, 20, 21, 22, 23, 25, 27, and 29 describe aspects of methods 1000, 1100, 1200, 1300, 1400, 1500, 1600, 1800, 2000, 2100, 2200, 2300, 2500, 2700, 2900, or 3000. It should be noted that the methods are merely example implementations, and the operations of the methods may be rearranged or otherwise modified such that other implementations are possible.

[0358] The technology described herein can be used in various wireless communication systems, such as code division multiple access (CDMA), time division multiple access (TDMA), FDMA, OFDMA, SC-FDMA and other systems. The terms "system" and "network" are often used interchangeably. A CDMA system can implement wireless technologies such as CDMA2000, Universal Terrestrial Radio Access (UTRA), etc. CDMA2000 covers IS-2000, IS-95 and IS-856 standards. IS-2000 versions 0 and A can be referred to as CDMA2000 1X, 1X, etc. IS-856 (TIA-856) can be referred to as CDMA2000 1xEV-DO, High Speed ​​Packet Data (HRPD), etc. UTRA includes broadband CDMA (WCDMA) and other variants of CDMA. A TDMA system can implement wireless technologies such as Global System for Mobile Communications (GSM). OFDMA systems can implement technologies such as Ultra Mobile Broadband (UMB), Evolved UTRA (E-UTRA), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash OFDM, etc. TMetc. UTRA and E-UTRA are parts of the Universal Mobile Telecommunications System (UMTS). 3GPP LTE and LTE-A are new versions of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, and GSM are described in documents from an organization named 3GPP. CDMA2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2). The techniques described herein can be used for the systems and wireless technologies mentioned above as well as other systems and wireless technologies, including cellular (e.g., LTE) communications over shared radio frequency spectrum bands. However, the above description describes an LTE / LTE-A system for example purposes, and LTE terminology is used in most of the above description, but the techniques are applicable beyond LTE / LTE-A applications.

[0359] The detailed description set forth above in conjunction with the accompanying drawings describes examples and does not represent all of the examples that may be implemented or fall within the scope of the claims. The terms "example" and "exemplary" when used in this description mean "serving as an example, instance, or illustration," rather than "preferred" or "advantageous to other examples." For the purpose of providing an understanding of the described techniques, the detailed description includes specific details. However, these techniques may be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0360] Information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0361] The various illustrative blocks and components described in conjunction with the disclosure herein may be implemented or performed using a general purpose processor, a digital signal processor (DSP), an ASIC, a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but alternatively, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

[0362] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software, the functions may be stored or sent as one or more instructions or codes on a computer-readable medium. Other examples and implementations fall within the scope and spirit of the present disclosure and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hard wiring, or any combination of these items. The features that implement the functions may be physically located at various locations, including being distributed so that parts of the functions are implemented at different physical locations. As used herein (including in the claims), the term "and / or" when used in a list of two or more items indicates that any one of the listed items may be used alone, or any combination of two or more of the listed items may be used. For example, if a combination is described as containing A, B, and / or C, the combination may contain only A; only B; only C; A and B in combination; A and C in combination; B and C in combination; or A, B, and C in combination. In addition, as used herein (including in the claims), "or" as used in a list of items (e.g., a list of items preceded by a phrase such as "at least one of" or "one or more of") indicates an inclusive list, so that, for example, a phrase referring to "at least one of" a list of items refers to any combination of those items, including single members. As an example, "at least one of A, B, or C" is intended to cover A, B, C, AB, AC, BC, and ABC, as well as any combination with multiple identical elements (e.g., AA, AAA, AAB, AAC, ABB, ACC, BB, BBB, BBC, CC, and CCC or any other ordering of A, B, and C).

[0363] As used herein, the phrase "based on" should not be understood as a reference to a closed set of conditions. For example, an exemplary step described as "based on condition A" can be based on both condition A and condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase "based on" should be understood in the same manner as the phrase "based at least in part on".

[0364] Computer readable medium includes both non-transitory computer storage medium and communication medium, and communication medium includes any medium that promotes the transmission of computer program from one place to another place.Non-transitory storage medium can be any available medium that can be accessed by general or special-purpose computer.By example and not limitation, non-transitory computer readable medium can include RAM, ROM, electrically erasable programmable read-only memory (EEPROM), compact disk (CD) ROM or other optical disk storage device, magnetic disk storage device or other magnetic storage device or any other can be used to carry or store the desired program code unit in the form of instruction or data structure and can be accessed by general or special-purpose computer or general or special-purpose processor.In addition, any connection is properly referred to as computer readable medium.For example, if software is sent from website, server or other remote source using coaxial cable, optical fiber cable, twisted pair, digital subscriber line (DSL) or wireless technology such as infrared, radio and microwave, then coaxial cable, optical fiber cable, twisted pair, DSL or wireless technology such as infrared, radio and microwave are included in the definition of medium. Disk and disc as used herein include CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc, wherein disks usually reproduce data magnetically, while optical discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

[0365] The previous description of the disclosure is provided to enable those skilled in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the scope of the disclosure. Therefore, the disclosure will not be limited to the examples and designs described herein, but will conform to the widest scope consistent with the principles and novel technologies disclosed herein.

Claims

1. A method for wireless communication at a user equipment (UE), comprising: receiving, in a downlink transmission time interval (TTI) of a scheduled transmission burst received over a shared radio frequency spectrum band, an indication of a downlink-uplink TTI configuration starting with the downlink TTI, wherein the downlink-uplink configuration includes some upcoming downlink TTIs, some uplink TTIs, or a combination thereof; and A timing of a next downlink TTI in the scheduled transmission burst is determined based at least in part on the downlink-uplink TTI configuration starting with the downlink TTI.

2. The method according to claim 1, further comprising: An additional indication of an additional downlink-uplink TTI configuration following the additional downlink TTI is received in each of the at least one additional downlink TTI of the scheduled transmission burst.

3. The method according to claim 1, further comprising: At least one of: a second indication of a downlink TTI duration, a third indication of an uplink TTI duration, or a combination thereof is received in the downlink TTI.

4. The method according to claim 1, wherein: The downlink TTI includes a downlink subframe, and the downlink-uplink TTI configuration includes a downlink-uplink subframe configuration.

5. An apparatus for wireless communication at a user equipment (UE), comprising: means for receiving, in a downlink transmission time interval (TTI) of a scheduled transmission burst received over a shared radio frequency spectrum band, an indication of a downlink-uplink TTI configuration starting with the downlink TTI, wherein the downlink-uplink configuration includes some upcoming downlink TTIs, some uplink TTIs, or a combination thereof; and Means for determining a timing of a next downlink TTI in the scheduled transmission burst based at least in part on the downlink-uplink TTI configuration starting with the downlink TTI.

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