Method, device and computer readable medium for beam failure recovery for secondary cell

A method implemented in a terminal device, comprising:

• in response to a beam failure on a secondary cell (Scell), determining a random access preamble to be transmitted, the random access preamble indicating a beam index of a beam selected from available beams on the Scell by the terminal device;
• transmitting the random access preamble to a network device and on the Scell, to recover communication between the terminal device and the network device via the selected beam on the Scell.

A method implemented in a terminal device, comprising:

• in response to a beam failure on a secondary cell (Scell), determining an uplink control channel of a primary cell (Pcell) to be used, based on resources of the uplink control channel and uplink control information to be transmitted on the uplink control channel;
• and
• transmitting, to a network device and on the uplink control channel, a beam failure recovery request along with the uplink control information, the beam failure recovery request comprising a Scell index of the Scell and a beam index of a beam selected from available beams on the Scell by the terminal device, to recover communication between the terminal device and the network device via the selected beam on the Scell.

A method implemented in a network device, comprising:

• receiving a scheduling request from a terminal device;
• transmitting, to the terminal device and on a primary cell (Pcell), a response indicating a resource allocated to the terminal device;
• receiving, from the terminal device and using the allocated resource, a beam failure recovery request comprising a beam index of a beam selected from available beams on a Scell by the terminal device, to communicate with the terminal device via the selected beam on the Scell.

A method implemented in a network device, comprising:

• receiving a random access preamble from a terminal device and on a secondary cell (Scell) serving the terminal device, the random access preamble indicating a beam index of of a beam selected from available beams on the Scell by the terminal device;
• and
• determining the beam index from the random access preamble, to communicate with the terminal device via the selected beam on the Scell.

A method implemented in a network device, comprising:

• receiving, from a terminal device and on an uplink control channel of a primary cell (Pcell) serving the terminal device, a beam failure recovery request along with uplink control information;
• and
• obtaining, from the beam failure recovery request, a Scell index of a secondary cell (Scell) serving the terminal device and a beam index of a beam selected from available beams on the Scell by the terminal device, to communicate with the terminal device via the selected beam on the Scell.