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US 11,153,917 B2Granted
System and method for random access backoffs
AssigneeFuturewei Technologies, Inc.
InventorsBin Liu, Yongbo Zeng, Jian Wang, Guorong Li, Yu Cai
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Abstract
A method of performing a random access procedure includes randomly selecting a backoff time from within a backoff window ranging from 0 to a specified multiple of a random access preamble unit, waiting until a time initialized with the backoff time expires, and retransmitting a random access preamble.
Claims31
A method for performing random access, the method comprises:
- receiving, by a user equipment (UE), a backoff indication;
- transmitting, by the UE, a first random access transmission of a random access preamble to initiate a random access procedure;
- determining, by the UE, that reception of a random access response corresponding to the first random access transmission of the random access preamble was not successful;
- selecting, by the UE, a backoff parameter value from a set of backoff parameter values based on the backoff indication, the set of backoff parameter values consisting of multiples of a duration of the random access preamble of the UE;
- and
- transmitting, by the UE, a second random access transmission upon expiration of a backoff time following the determination that reception of the random access response corresponding to the first random access transmission of the random access preamble was not successful, the backoff time being randomly selected from between zero and the selected backoff parameter value.
3 more elements
A user equipment (UE) comprising:
- a processor;
- and
- a non-transitory computer readable storage medium storing programming for execution by the processor, the programming including instructions to:
- receive a backoff indication;
- transmit a first random access transmission of a random access preamble to initiate a random access procedure;
- determine that reception of a random access response corresponding to the first random access transmission of the random access preamble was not successful;
- select a backoff parameter value from a set of backoff parameter values based on the backoff indication, the set of backoff parameter values consisting of multiples of a duration of the random access preamble of the UE;
- and
- transmit a second random access transmission upon expiration of a backoff time following the determination that reception of the random access response corresponding to the first random access transmission of the random access preamble was not successful, the backoff time being randomly selected from between zero and the selected backoff parameter value.
6 more elements
A method for facilitating random access, the method comprising:
- transmitting, by a base station, a backoff indicator to a user equipment (UE), the backoff indicator indicating a backoff parameter value in a set of backoff parameter values that consists of integer multiples of a duration of a random access preamble of the UE;
- and
- receiving, by the base station, a random access transmission from the UE, the random access transmission performed in accordance with the backoff parameter value indicated by the backoff indicator.
A base station comprising:
- a processor;
- and
- a non-transitory computer readable storage medium storing programming for execution by the processor, the programming including instructions to:
- transmit a backoff indicator to a user equipment (UE), the backoff indicator indicating a backoff parameter value in a set of backoff parameter values that consists of integer multiples of a duration of a random access preamble of the UE;
- and
- receive a random access transmission from the UE, the random access transmission performed in accordance with the backoff parameter value indicated by the backoff indicator.
3 more elements
Dependencies are inferred from the claim text.