Methods, systems, and devices for wireless communications are described. One example method for wireless communications at a user equipment (UE) includes detecting a radio link failure (RLF) condition for a connection between the UE and a network over a first cell group and determining, in response to detecting the RLF condition, whether an air interface resource allocation is available for a signaling radio bearer (SRB) between the UE and the network over another cell group. The method also includes selecting, based at least in part on the determination, one of a plurality of RLF procedures. In some examples, the UE may select a first RLF procedure that fully releases radio resources when no SRB is available and a different, second RLF procedure that partially when an SRB is available between the UE and the network over a second cell group.

The present disclosure provides a method in a network device serving a first cell and a second cell. The method includes: determining that a first User Equipment, UE, in the first cell and a second UE in the second cell are associated with one physical terminal device; and enabling, in response to said determining, the terminal device to perform as the first UE, without enabling the terminal device to perform as the second UE, one or more of: measuring a reference signal from the network device, transmitting a reference signal to the network device, or transmitting a measurement report to the network device.

The present disclosure provides a method in a network device serving a first cell and a second cell. The method includes: determining that a first User Equipment, UE, in the first cell and a second UE in the second cell are associated with one physical terminal device; and enabling, in response to said determining, the terminal device to perform as the first UE, without enabling the terminal device to perform as the second UE, one or more of: measuring a reference signal from the network device, transmitting a reference signal to the network device, or transmitting a measurement report to the network device.

Embodiments of this application provide a Bluetooth connection method, a system, and an electronic device. In the method, when a communication connection between an electronic device and a vehicle head unit is disconnected, the electronic device starts to scan a Bluetooth advertising signal. When a user carrying the electronic device is close to the vehicle head unit, the electronic device may obtain, through scanning, a Bluetooth advertising signal sent by the vehicle head unit. When obtaining, through scanning, the Bluetooth advertising signal sent by the vehicle head unit, the electronic device may start a vehicle manufacturer application when the vehicle manufacturer application is cleared by a system. The electronic device may reconnect to the vehicle head unit through Bluetooth by using the vehicle manufacturer application and a Bluetooth chip. Embodiments of this application can improve convenience of unlocking in a scenario in which a vehicle is insensibly unlocked.

Embodiments of this application provide example communication methods and apparatuses. One example method includes receiving, by a first network device, a first request message and uplink data from a terminal, where the first request message is for requesting to resume a suspended radio resource control (RRC) connection. The first network device can then send a second request message to a second network device based on the first request message and the uplink data, where the second network device is a network device previously serving the terminal, and the second request message includes information about the uplink data, where the second request message is for requesting the second network device to release a first data channel between the second network device and a core network device, or the second request message is for requesting the second network device to send a context of the terminal to the first network device.

Embodiments of this application provide example communication methods and apparatuses. One example method includes receiving, by a first network device, a first request message and uplink data from a terminal, where the first request message is for requesting to resume a suspended radio resource control (RRC) connection. The first network device can then send a second request message to a second network device based on the first request message and the uplink data, where the second network device is a network device previously serving the terminal, and the second request message includes information about the uplink data, where the second request message is for requesting the second network device to release a first data channel between the second network device and a core network device, or the second request message is for requesting the second network device to send a context of the terminal to the first network device.

Some embodiments of the present disclosure provide a voice call method, a system, a chip, an electronic device, and a storage medium. In the present disclosure, the voice call method includes: in response to receiving a voice call request instruction from a second terminal in a process of transmitting a voice call data packet with a first terminal, sending a request for disconnecting synchronous data connection to the first terminal (101); transmitting the voice call data packet to the second terminal (102) after receiving a request for establishing the synchronous data connection sent by the second terminal. In a scenario where there are incoming calls from multiple terminals, data communication load of a Bluetooth chip can be lessened, and power consumption of the Bluetooth chip can be reduced.

Some embodiments of the present disclosure provide a voice call method, a system, a chip, an electronic device, and a storage medium. In the present disclosure, the voice call method includes: in response to receiving a voice call request instruction from a second terminal in a process of transmitting a voice call data packet with a first terminal, sending a request for disconnecting synchronous data connection to the first terminal (101); transmitting the voice call data packet to the second terminal (102) after receiving a request for establishing the synchronous data connection sent by the second terminal. In a scenario where there are incoming calls from multiple terminals, data communication load of a Bluetooth chip can be lessened, and power consumption of the Bluetooth chip can be reduced.

The present application relates to small data transmission (SDT). In an example, SDT is available for transferring information between a UE and a network, where a NAS layer of the UE is in a 5GMM-CONNECTED mode with an RRC inactive indication and an AS layer of the UE is in an RRC_INACTIVE state. To do so, the UE can be pre-configured to classify the information as qualifying for SDT. In addition, resources can be pre-configured for the SDT. For instance, the UE can maintain a set of radio bearers in a suspended state. While the NAS layer is in the 5GMM-CONNECTED mode with the inactive indication and the AS layer is in the RRC_INACTIVE state, one or more of the pre-configured resources can be used to transmit the information between the UE and the network.

The present application relates to small data transmission (SDT). In an example, SDT is available for transferring information between a UE and a network, where a NAS layer of the UE is in a 5GMM-CONNECTED mode with an RRC inactive indication and an AS layer of the UE is in an RRC_INACTIVE state. To do so, the UE can be pre-configured to classify the information as qualifying for SDT. In addition, resources can be pre-configured for the SDT. For instance, the UE can maintain a set of radio bearers in a suspended state. While the NAS layer is in the 5GMM-CONNECTED mode with the inactive indication and the AS layer is in the RRC_INACTIVE state, one or more of the pre-configured resources can be used to transmit the information between the UE and the network.