System and method for beam failure recovery request by user equipment

An apparatus for wireless communication by a user equipment (UE), the apparatus comprising:

• a memory;
• and
• at least one processor coupled to the memory and configured to:
• determine whether a contention-free random access channel (RACH) procedure with a dedicated preamble or a contention-based RACH procedure for beam failure recovery with a base station based on reception of a RACH configuration from the base station for at least one of the contention-free RACH procedure with the dedicated preamble or the contention-based RACH procedure;
• perform, based on detection of a failure of a serving beam through which the UE communicates with the base station, the determined one of the contention-free RACH procedure with the dedicated preamble or the contention-based RACH procedure for the beam failure recovery, wherein the dedicated preamble is determined using a beam corresponding to a reference signal, wherein the reference signal is selected based on a power metric associated with the reference signal.

A method of wireless communication by a base station providing a cell, the method comprising:

• configuring a first set of parameters for beam failure recovery by a user equipment (UE), the first set of parameters being associated with one of a contention-free random access channel (RACH) procedure with a dedicated preamble or a contention-based RACH procedure;
• and
• transmitting at least the first set of parameters to enable the UE to determine whether to use the contention-free RACH procedure or the contention-based RACH procedure for the beam failure recovery;
• and
• receiving a dedicated preamble corresponding to a beam corresponding to a reference signal when the UE initiates a contention-free RACH procedure for the beam failure recovery, wherein the dedicated preamble is determined using the beam ID-corresponding to the reference signal, wherein the reference signal is selected based on a power metric associated with the reference signal.

An apparatus for wireless communication by a base station providing a cell, the apparatus comprising:

• a memory;
• and
• at least one processor coupled to the memory and configured to:
• configure a first set of parameters for beam failure recovery by a user equipment (UE), the first set of parameters being associated with one of a contention-free random access channel (RACH) procedure with a dedicated preamble or a contention-based RACH procedure;
• and
• transmit at least the first set of parameters to enable the UE to determine whether to use the contention-free RACH procedure or the contention-based RACH procedure for the beam failure recovery;
• and
• receiving a dedicated preamble corresponding to a beam corresponding to a reference signal when the UE initiates a contention-free RACH procedure for the beam failure recovery, wherein the dedicated preamble is determined using the beam ID-corresponding to the reference signal, wherein the reference signal is selected based on a power metric associated with the reference signal.