System and method for random access backoffs
First Claim
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1. A method for performing a random access procedure, the method comprises:
- transmitting, by a user equipment (UE), a first random access preamble transmission on a first carrier or a first band; and
determining that a random access procedure associated with the random access preamble transmission has failed and, based thereon performing the following operations;
randomly selecting, by the UE, a backoff time from within a backoff window, the backoff window ranging from 0 to an indicated multiple of a random access preamble unit, the random access preamble unit being a random access preamble duration, the multiple selected from a set stored on the UE, and the set consisting of a plurality of multiples of the random access preamble unit; and
in response to the backoff time being greater than o;
waiting, by the UE, until the selected backoff time expires; and
transmitting, by the UE, a second random access preamble transmission on a second carrier or a second band after the backoff time expires.
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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.
45 Citations
21 Claims
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1. A method for performing a random access procedure, the method comprises:
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transmitting, by a user equipment (UE), a first random access preamble transmission on a first carrier or a first band; and determining that a random access procedure associated with the random access preamble transmission has failed and, based thereon performing the following operations; randomly selecting, by the UE, a backoff time from within a backoff window, the backoff window ranging from 0 to an indicated multiple of a random access preamble unit, the random access preamble unit being a random access preamble duration, the multiple selected from a set stored on the UE, and the set consisting of a plurality of multiples of the random access preamble unit; and in response to the backoff time being greater than o; waiting, by the UE, until the selected backoff time expires; and transmitting, by the UE, a second random access preamble transmission on a second carrier or a second band after the backoff time expires. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A user equipment (UE) comprising:
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a non-transitory memory storage comprising instructions; and one or more processors in communication with the non-transitory memory storage, wherein the one or more processors execute the instructions to; transmit a first random access preamble transmission on a first carrier or a first band; and determine that a random access procedure associated with the random access preamble transmission has failed and, based thereon, performing the following operations; randomly select a backoff time from within a backoff window wherein the backoff window ranges from 0 to an indicated multiple of a random access preamble unit, wherein the random access preamble unit is a random access preamble duration, wherein the multiple is selected from a set stored on the UE, and wherein the set consists of a plurality of multiples of the random access preamble unit; and in response to the backoff time being greater than 0; wait until the selected backoff time expires; and transmit a second random access preamble transmission on a second carrier or a second band after the backoff time expires. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method for transmitting a random access preamble, the method comprising:
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generating, by a user equipment (UE), a random access preamble; determining a number of repetitions of the random access preamble required per preamble transmission attempt for a physical random access channel (PRACH) transmission; and in response to the number of random access preamble repetitions per attempt being larger than a threshold; segmenting, by the UE, the PRACH transmission into a plurality of blocks; and separately transmitting, by the UE, each of the plurality of blocks, there being no random access preamble transmission between the plurality of blocks. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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Specification