Beam failure recovery procedure

A wireless device comprising:

• a transceiver;
• and
• at least one processor configured to:
• control the transceiver to receive one or more RRC messages comprising configuration parameters for a beam failure recovery, wherein the configuration parameters comprises a plurality of reference signals for a beam failure detection, a second number of beam failure instances, a timer value for a response window, and a first number for preamble transmissions,
• detect one or more beam failure instances based on the plurality of the reference signals for the beam failure detection,
• determine a beam failure based on a number of detection of the one or more beam failure instances reaching the second number,
• initiate a random access procedure for the beam failure recovery,
• control the transceiver to transmit one or more preambles in response to initiating a beam failure recovery,
• determine a failure of the beam failure recovery based on a number of transmissions of the one or more preambles exceeding the first number,
• determine a radio link failure in response to the failure of the beam failure recovery,
• store a cause of the radio link failure as the failure of the beam failure recovery, and
• start, based on the determination of the radio link failure, a radio resource control (RRC) connection re-establishment procedure.

A system comprising:

• a wireless device comprising:
• a first transceiver;
• and
• at least one first processor configured to:
• control the first transceiver to receive one or more RRC messages comprising configuration parameters of a beam failure recovery, wherein the configuration parameters comprises a plurality of reference signals for a beam failure detection, a second number of beam failure instances, a timer value for a response window, and a first number for preamble transmissions,
• detect one or more beam failure instances based on the plurality of the reference signals for the beam failure detection,
• determine a beam failure based on a number of detection of the one or more beam failure instances reaching the second number,
• initiate a random access procedure for the beam failure recovery,
• control the first transceiver to transmit one or more preambles in response to initiating a beam failure recovery,
• determine a failure of the beam failure recovery based on a number of transmissions of the one or more preambles exceeding the first number,
• determine a radio link failure in response to the failure of the beam failure recovery, and
• start, based on the radio link failure, a radio resource control (RRC) connection re-establishment procedure, and
• a base station comprising:
• a second transceiver;
• and
• at least one second processor configured to:
• control the second transceiver to transmit the one or more RRC messages comprising the configuration parameters of the beam failure recovery, and
• control the second transceiver to receive the one or more preambles.