Methods, systems, and devices for wireless communications are described in which a narrowband device may communicate in a wireless communications network according to frequency hopping techniques. Devices using narrowband communications and frequency hopping techniques may maintain separate radio link monitoring (RLM) processes, beam failure detection (BFD) processes, beam failure recovery (BFR) processes, or combinations thereof, for multiple bandwidth parts (BWPs) or hop regions of a full channel bandwidth. Such separate processes may provide for enhanced estimates of beam failures per BWP or hop region, which may be used to enhance communications reliability.

Methods, systems, and devices for wireless communications are described in which a narrowband device may communicate in a wireless communications network according to frequency hopping techniques. Devices using narrowband communications and frequency hopping techniques may maintain separate radio link monitoring (RLM) processes, beam failure detection (BFD) processes, beam failure recovery (BFR) processes, or combinations thereof, for multiple bandwidth parts (BWPs) or hop regions of a full channel bandwidth. Such separate processes may provide for enhanced estimates of beam failures per BWP or hop region, which may be used to enhance communications reliability.

A method includes determining, by a terminal device, a relation of size between an amount of data to be sent of a first split bearer of the terminal device and a preset threshold of the first split bearer, wherein the amount of the data to be sent includes a total amount of data volume in a PDCP layer of the first split bearer and an amount of data in a first RLC layer that is configured by a network side on the first split bearer and that is used to transmit data by default. The method also includes determining according to the relation of size in a plurality of cell groups corresponding to the first split bearer, a target cell group used to process the data to be sent according to the relation of size. The method facilitates load balance between cell groups and data transmission flexibility.

A method includes determining, by a terminal device, a relation of size between an amount of data to be sent of a first split bearer of the terminal device and a preset threshold of the first split bearer, wherein the amount of the data to be sent includes a total amount of data volume in a PDCP layer of the first split bearer and an amount of data in a first RLC layer that is configured by a network side on the first split bearer and that is used to transmit data by default. The method also includes determining according to the relation of size in a plurality of cell groups corresponding to the first split bearer, a target cell group used to process the data to be sent according to the relation of size. The method facilitates load balance between cell groups and data transmission flexibility.

Apparatuses, methods, and systems are disclosed for discarding radio link control service data units. One method (700) includes sending (702) at least a portion of a radio link control service data unit. The method (700) includes receiving (704) an indication from a packet data convergence protocol layer to discard the radio link control service data unit after sending at least the portion of the radio link control service data unit. The method (700) includes, in response to receiving the indication to discard the radio link control service data unit, transmitting (706) information indicating to discard the radio link control service data unit.

Apparatuses, methods, and systems are disclosed for discarding radio link control service data units. One method (700) includes sending (702) at least a portion of a radio link control service data unit. The method (700) includes receiving (704) an indication from a packet data convergence protocol layer to discard the radio link control service data unit after sending at least the portion of the radio link control service data unit. The method (700) includes, in response to receiving the indication to discard the radio link control service data unit, transmitting (706) information indicating to discard the radio link control service data unit.

A method and apparatus are disclosed. In an example from the perspective of a first device, the first device performs sidelink communication with one or more destinations. The first device receives and/or selects a sidelink grant associated with a sidelink transmission. Responsive to the sidelink grant, the first device selects a first destination of the one or more destinations based upon a report signaling. The first device performs the sidelink transmission associated with the sidelink grant to the first destination.

A method and apparatus are disclosed. In an example from the perspective of a first device, the first device performs sidelink communication with one or more destinations. The first device receives and/or selects a sidelink grant associated with a sidelink transmission. Responsive to the sidelink grant, the first device selects a first destination of the one or more destinations based upon a report signaling. The first device performs the sidelink transmission associated with the sidelink grant to the first destination.

A communication method and system for converging a 5.sup.th-Generation (5G) communication system for supporting higher data rates beyond a 4.sup.th-Generation (4G) system with a technology for Internet of Things (IoT) are provided. The communication method and system may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method and apparatus for determining a reception area of a packet in a V2X system are provided. In described aspects, a reception terminal may receive location information of a transmitting terminal and range information of transmitted data, and may determine whether to provide feedback regarding the transmitted data based on the location information and the range information.

A communication method and system for converging a 5.sup.th-Generation (5G) communication system for supporting higher data rates beyond a 4.sup.th-Generation (4G) system with a technology for Internet of Things (IoT) are provided. The communication method and system may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method and apparatus for determining a reception area of a packet in a V2X system are provided. In described aspects, a reception terminal may receive location information of a transmitting terminal and range information of transmitted data, and may determine whether to provide feedback regarding the transmitted data based on the location information and the range information.