Abstract: This document describes techniques and apparatuses for performing listen-before-talk procedures on bandwidth parts. These techniques include a user equipment (UE) initiating a first listen-before-talk (LBT) procedure on an active bandwidth part used in a radio resource control (RRC) connection between a UE and a base station. During the first LBT procedure, the UE receives a configuration message from the base station instructing the UE to change the active bandwidth part from the first bandwidth part to a second bandwidth part. Responsively, the UE changes the active bandwidth part and initiates a second LBT procedure on the second bandwidth part.

Abstract: This document describes techniques and apparatuses for managing scheduling requests in an unlicensed frequency band. These techniques include a user equipment receiving first and second configuration messages allocating radio resources for first and second logical channels, respectively, at a scheduling request (SR)-transmission occasion on first and second multiple-access (MA) channels, respectively, in the unlicensed frequency band (402, 404). In aspects, the user equipment detects that the first MA channel is busy and the second MA channel is idle (406). The user equipment transmits a scheduling request via the second radio resource (408) and initiates a timer for the second logical channel to prohibit transmission of an additional scheduling request via the second radio resource until expiration of the timer (410). The user equipment also determines whether to initiate another timer for the first logical channel based on a priority level of the first logical channel (414).

Abstract: This document describes processing a buffer status report from a user equipment (UE) by a base station in a radio access network, in which the base station receives a One-Byte-Buffer Status Report for a Logical Channel Group with a highest priority logical channel and data available for transmission by the user equipment, the One-Byte-Buffer Status Report indicating that a number of padding bits in a Media Access Control (MAC) Protocol Data Unit (PDU) is greater than or equal to a size of a subheader of a Short Buffer Status Report (BSR) or greater than or equal to the size of the Short BSR and is also less than the size of the Short BSR plus the subheader of the Short BSR.

Abstract: This document describes reporting beam failure by a user equipment (110) to a base station (121) in a radio access network (140), in which the user equipment (110) receives a first uplink grant (502) and initiates a beam recovery procedure (504). Based on the beam recovery procedure determining that a beam has failed, the user equipment (110) transmits, using the first uplink grant, a first Media Access Control Protocol Data Unit including a first MAC Control Element that indicates a first Synchronization Signal Block and a second Synchronization Signal Block, the transmission being effective to cause the base station (121) to determine that, based on receiving the first Synchronization Signal Block, the beam failure was detected by the user equipment (110) on the first Synchronization Signal Block (506).

Abstract: A method for handling BWPs utilized in a communication device comprises receiving a first MAC CE for activating at least one first SCell, from a network; activating the at least one first SCell; starting a sCellDeactivationTimer associated with the at least one first SCell, when activating the at least one first SCell; deactivating the at least one first SCell, if a second MAC CE for deactivating the at least one first SCell is received from the network, or if the sCellDeactivationTimer expires; stopping the sCellDeactivationTimer, when deactivating the at least one first SCell; and stopping a first BWP-InactivityTimer for the at least one first SCell, when deactivating the at least one first SCell.

Abstract: This document describes techniques and apparatuses for performing listen-before-talk procedures on bandwidth parts. These techniques include a user equipment (UE) initiating a first listen-before-talk (LBT) procedure on an active bandwidth part used in a radio resource control (RRC) connection between a UE and a base station. During the first LBT procedure, the UE receives a configuration message from the base station instructing the UE to change the active bandwidth part from the first bandwidth part to a second bandwidth part. Responsively, the UE changes the active bandwidth part and initiates a second LBT procedure on the second bandwidth part.

Abstract: This document describes techniques and apparatuses for managing scheduling requests in an unlicensed frequency band. These techniques include a user equipment receiving first and second configuration messages allocating radio resources for first and second logical channels, respectively, at a scheduling request (SR)-transmission occasion on first and second multiple-access (MA) channels, respectively, in the unlicensed frequency band (402, 404). In aspects, the user equipment detects that the first MA channel is busy and the second MA channel is idle (406). The user equipment transmits a scheduling request via the second radio resource (408) and initiates a timer for the second logical channel to prohibit transmission of an additional scheduling request via the second radio resource until expiration of the timer (410). The user equipment also determines whether to initiate another timer for the first logical channel based on a priority level of the first logical channel (414).

Abstract: This document describes processing a buffer status report from a user equipment (UE) by a base station in a radio access network, in which the base station receives a One-Byte-Buffer Status Report for a Logical Channel Group with a highest priority logical channel and data available for transmission by the user equipment, the One-Byte-Buffer Status Report indicating that a number of padding bits in a Media Access Control (MAC) Protocol Data Unit (PDU) is greater than or equal to a size of a subheader of a Short Buffer Status Report (BSR) or greater than or equal to the size of the Short BSR and is also less than the size of the Short BSR plus the subheader of the Short BSR.

Abstract: This document describes reporting beam failure by a user equipment (110) to a base station (121) in a radio access network (140), in which the user equipment (110) receives a first uplink grant (502) and initiates a beam recovery procedure (504). Based on the beam recovery procedure determining that a beam has failed, the user equipment (110) transmits, using the first uplink grant, a first Media Access Control Protocol Data Unit including a first MAC Control Element that indicates a first Synchronization Signal Block and a second Synchronization Signal Block, the transmission being effective to cause the base station (121) to determine that, based on receiving the first Synchronization Signal Block, the beam failure was detected by the user equipment (110) on the first Synchronization Signal Block (506).

Abstract: This document describes techniques and devices for identifying and handling persistently occupied channels within unlicensed radio spectrum. In particular, a user equipment (UE) determines whether or not a channel that is associated with a particular bandwidth part or a sub-band of the bandwidth part is persistently occupied. The UE employs techniques that decrease sensitivity to uplink transmission timing or short-term channel congestion and enables the UE to efficiently identify persistently occupied channels. For example, the UE can use a first timer and a first counter to determine whether or not the channel is persistently occupied. The UE can recover from a situation in which the channel is persistently occupied and report information to a base station regarding the persistently occupied channel. In this way, the UE can utilize the unlicensed radio spectrum and re-establish communications responsive to the presence of one or more persistently occupied channels.

Abstract: This document describes techniques for, and systems that enable, HARQ buffer management. These techniques include removing (314), based on a user device failing to transmit data during an uplink grant, data stored in a HARQ buffer. By removing the data stored in the HARQ buffer, the user device can avoid (322) transmitting, to the base station, the data stored in the HARQ buffer in response to a retransmission request from the base station.

Abstract: A communication device for handling scheduling requests (SRs) for logical channels comprises at least one processing circuit configured to execute instructions of: receiving a configuration of a first logical channel, a configuration of a second logical channel, a first SR configuration associated to the first logical channel and a second SR configuration associated to the second logical channel; when a priority of the first logical channel is higher than or equal to a priority of the second logical channel and the first logical channel has first data becoming available for a first data transmission, triggering a first buffer status reporting (BSR) and a first scheduling request (SR) for the first BSR and transmitting the first SR according to the first SR configuration; and when the first logical channel is released, canceling the first SR.

Abstract: This document describes reporting a buffer status by a user equipment (UE) (110) to a base station (121) in a radio access network (140), in which the user equipment (110) determines if a number of remaining bits in a Media Access Control (MAC) Protocol Data Unit (PDU) can be included in a Buffer Status Report (BSR), if a first logical channel has data pending for transmission, and that the first logical channel has a highest priority of logical channels that have data pending for transmission. The user equipment (110) sets a first subfield of a Logical Channel Identifier (LCID) to the first value, sets a second subfield of the LCID field in the first subheader to a second value that is associated with the first value, and transmits the MAC PDU to the base station (121).

Abstract: A communication device for handling a scheduling request (SR) for a logical channel (LC) comprises a storage device storing instructions of transmitting a first SR for a first LC to a network and starting a first sr-ProhibitTimer associated to the first LC, when the first SR is triggered by the first LC and the first sr-ProhibitTimer is not running; not transmitting the first SR for the first LC, when the first SR is triggered by the first LC and the first sr-ProhibitTimer is running; transmitting a second SR for a second LC to the network and starting a second sr-ProhibitTimer associated to the second LC, when the second SR is triggered by the second LC and the second sr-ProhibitTimer is not running; and not transmitting the second SR triggered by the second LC, when the second SR is triggered by the second LC and the second sr-ProhibitTimer is running.

Abstract: A communication device of performing a random access (RA) procedure comprises instructions of: receiving a first configuration of a first synchronization signal (SS) block of a base station (BS) and a second configuration of a second SS block of the BS; obtaining a first result indicating that a first signal quality of the first SS block is higher than a second signal quality of the second SS block; selecting the first configuration according to the first result; obtaining a second result indicating that the first signal quality is lower than the second signal quality, when the communication device fails to receive at least one message from the BS; and selecting the second configuration according to the second result.

Abstract: This document describes reporting a buffer status by a user equipment (UE) (110) to a base station (121) in a radio access network (140), in which the user equipment (110) determines if a number of remaining bits in a Media Access Control (MAC) Protocol Data Unit (PDU) can be included in a Buffer Status Report (BSR), if a first logical channel has data pending for transmission, and that the first logical channel has a highest priority of logical channels that have data pending for transmission. The user equipment (110) sets a first subfield of a Logical Channel Identifier (LCID) to the first value, sets a second subfield of the LCID field in the first subheader to a second value that is associated with the first value, and transmits the MAC PDU to the base station (121).

Abstract: A communication device of handling a schedule request (SR) comprises a storage device and a processing circuit, coupled to the storage device. The storage device stores, and the processing circuit is configured to execute instructions of: receiving a first configuration of a first logical channel (LC), a second configuration of a second LC, a first SR configuration corresponding to the first LC, and a second SR configuration corresponding to the second LC from a base station (BS); transmitting a first buffer status report (BSR); starting a BSR retransmission timer (retxBSR-Timer) in response to the transmission of the first BSR; transmitting a SR to the BS according to the first SR configuration, when the retxBSR-Timer expires, the first LC has first data available for being transmitted, and a first priority of the first LC is higher than a second priority of the second LC.

Abstract: The present disclosure describes one or more aspects for monitoring a physical downlink control channel for downlink control information. Such aspects include receiving (605), by the user equipment (110) from a base station (120) and through a physical downlink shared channel (PDSCH) of an air interface, a first message that includes data and, upon receiving the first message, triggering (610) an act of monitoring a physical downlink control channel (PDDCH) of the air interface for a downlink control information (DCI) message. Upon receiving (615) the DCI message, the user equipment (110) transmits (620) a hybrid automatic request (HARQ) acknowledgment/not-acknowledgement (ACK/NACK) message through a physical uplink control channel (PUCCH) of the air interface. Upon transmitting the HARQ ACK/NACK message, the user equipment (110) cancels (625) the act of monitoring the PDCCH for the DCI message.

Abstract: A method for a use equipment to transmit duplication data using multiple carriers includes: configured by a base station to associate a first radio bearer to at least a first logical channel and a second logical channel; associating the first logical channel to at least one first carrier; associating the second logical channel to at least one second carrier that is different from the first carrier; and transmitting a first data associated with the first radio bearer via the first logical channel and a duplicate of the first data via the second logical channel.

Abstract: This document describes techniques for, and systems that enable, HARQ buffer management. These techniques include removing (314), based on a user device failing to transmit data during an uplink grant, data stored in a HARQ buffer. By removing the data stored in the HARQ buffer, the user device can avoid (322) transmitting, to the base station, the data stored in the HARQ buffer in response to a retransmission request from the base station.