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US 2024/0204852 A1Published application
Method and device for random access for beam failure recovery
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsRui FAN, Icaro L. J. DA SILVA, Helka-Liina MÄÄTTANEN
Life of this patent
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Abstract
A method for random access for beam failure recovery. In the method, a random access configuration for the beam failure recovery is received. In the event of a beam failure, a random access procedure is performed according to the random access configuration.
Claims12
A method in a user equipment in a network comprising:
- receiving a message comprising a specific random access configuration for beam failure recovery from the network,
- wherein the specific random access configuration for the beam failure recovery differs from a random access configuration for an ordinary random access procedure,
- wherein the specific random access configuration for the beam failure recovery comprises at least one of:
- a maximum number of preamble transmission attempts, a size of random access response (RAR) window for the beam failure recovery, a contention free random access resource, or both the size of the RAR window and the contention free random access resource, and
- wherein the size of the RAR window for the beam failure recovery differs from a size of a RAR window for the ordinary random access procedure, and usage of contention free random access resources differ between the contention free random access for the beam failure recovery and a contention free random access for the ordinary random access procedure;
- determining a beam failure event;
- and
- performing a random access procedure for the beam failure recovery using the received specific random access configuration, the random access procedure being performed comprises:
- selecting a candidate beam with a Reference Signal Received Power (RSRP) higher than a threshold;
- and
- attempting random access via the selected candidate beam;
- stopping the random access procedure when:
- a radio link failure (RLF) timer expires;
- or
- a maximum number of the preamble transmission attempts is reached.
12 more elements
A user equipment comprising:
- a processor;
- and
- a memory containing instructions which, when executed by the processor, cause the user equipment to:
- receive a message comprising a specific random access configuration for beam failure recovery from a network,
- wherein the specific random access configuration for the beam failure recovery differs from a random access configuration for an ordinary random access procedure,
- wherein the specific random access configuration for the beam failure recovery comprises at least one of:
- a maximum number of preamble transmission attempts, a size of random access response (RAR) window for the beam failure recovery, a contention free random access resource, or both the size of the RAR window and the contention free random access resource, and
- wherein the size of the RAR window for the beam failure recovery differs from a size of a RAR window for the ordinary random access procedure, and usage of contention free random access resources differ between the contention free random access for the beam failure recovery and a contention free random access for the ordinary random access procedure;
- determine a beam failure event;
- and
- perform a random access procedure for the beam failure recovery using the received specific random access configuration, the random access procedure being performed comprises:
- select a candidate beam with a Reference Signal Received Power (RSRP) higher than a threshold;
- and
- attempt random access via the selected candidate beam.
- stopping the random access procedure when:
- a radio link failure (RLF) timer expires;
- or
- a maximum number of the preamble transmission attempts is reached.
15 more elements
A non-transitory computer readable storage medium having a computer program stored thereon, the computer program which, when executed by a processor of a user equipment, cause the user equipment to perform operations comprising:
- receiving a message comprising a specific random access configuration for beam failure recovery from a network,
- wherein the specific random access configuration for the beam failure recovery differs from a random access configuration for an ordinary random access procedure,
- wherein the specific random access configuration for the beam failure recovery comprises at least one of:
- a maximum number of preamble transmission attempts, a size of random access response (RAR) window for the beam failure recovery, a contention free random access resource, or both the size of the RAR window and the contention free random access resource, and
- wherein the size of the RAR window for the beam failure recovery differs from a size of a RAR window for the ordinary random access procedure, and usage of contention free random access resources differ between the contention free random access for the beam failure recovery and a contention free random access for the ordinary random access procedure;
- determining a beam failure event;
- and
- performing a random access procedure for the beam failure recovery using the received specific random access configuration, the random access procedure being performed comprises:
- selecting a candidate beam with a Reference Signal Received Power (RSRP) higher than a threshold;
- and
- attempting random access via the selected candidate beam;
- stopping the random access procedure when:
- a radio link failure (RLF) timer expires;
- or
- a maximum number of the preamble transmission attempts is reached.
12 more elements
Dependencies are inferred from the claim text.