Generation of random access preambles
First Claim
1. An apparatus to be included in a wireless transmit and receive unit (“
- WTRU”
), the apparatus comprising;
processing circuitry to;
determine a repetition level that corresponds to a number of repetitions associated with wireless communications between the WTRU and an access node;
generate a random access preamble based on a logical root sequence index associated with the determined repetition level; and
determine a resource of a physical random access channel (PRACH) for transmission of random access preambles associated with a repetition level equal to the determined repetition level, the resource determined from a first PRACH resource for transmission of random access preambles associated with a first repetition level and a second PRACH resource for transmission of random access preambles associated with a second repetition level, the first PRACH resource different than the second PRACH resource; and
communications circuitry, communicatively coupled with the processing circuitry, to transmit the generated random access preamble to the access node using the determined resource of the PRACH.
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Accused Products
Abstract
Embodiments described herein relate generally to a random procedure between wireless transmit/receive units (“WTRUs”) and access nodes. A WTRU may be adapted to determine a repetition level that corresponds to a number of repetitions associated with communication with the access node. The WTRU may then determine at least one of a resource and/or a logical root sequence index associated with the random access procedure. The WTRU may transmit a random access preamble based on the resource and/or a logical root sequence index. The access node may be adapted to determine a repetition level associated with the WTRU based on the random access procedure. Other embodiments may be described and/or claimed.
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Citations
24 Claims
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1. An apparatus to be included in a wireless transmit and receive unit (“
- WTRU”
), the apparatus comprising;processing circuitry to; determine a repetition level that corresponds to a number of repetitions associated with wireless communications between the WTRU and an access node; generate a random access preamble based on a logical root sequence index associated with the determined repetition level; and determine a resource of a physical random access channel (PRACH) for transmission of random access preambles associated with a repetition level equal to the determined repetition level, the resource determined from a first PRACH resource for transmission of random access preambles associated with a first repetition level and a second PRACH resource for transmission of random access preambles associated with a second repetition level, the first PRACH resource different than the second PRACH resource; and communications circuitry, communicatively coupled with the processing circuitry, to transmit the generated random access preamble to the access node using the determined resource of the PRACH. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- WTRU”
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8. An apparatus to be included in a wireless transmit and receive unit (“
- WTRU”
), the apparatus comprising;processing circuitry to; generate a plurality of random access preambles for transmissions of messages from the WTRU based on a first logical root sequence index associated with a first repetition level, the first logical root sequence index different than a second logical root sequence index associated with a second repetition level used to generate a second plurality of random access preambles; estimate a path loss between the WTRU and an access node; determine a difference between a maximum output power of a cell provided by the access node and a sum of (1) a power offset between a random access preamble and a message scheduled for uplink transmission and (2) a preamble initial received target power; compare the path loss with the determined difference; determine a group of random access preambles from the plurality of random access preambles available for transmission in association with the message based on the comparison of the path loss with the determined difference; identify a random access preamble within the determined group; and determine a physical random access channel (PRACH) resource associated with the determined group from PRACH resources; and communications circuitry, communicatively coupled with the processing circuitry, to transmit the identified random access preamble to the access node using the PRACH resource associated with the determined group. - View Dependent Claims (9, 10, 11, 12, 13)
- WTRU”
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14. An apparatus to be included in an access node, the apparatus comprising:
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communications circuitry to; transmit, to a wireless transmit and receive unit (“
WTRU”
), a system information block that includes an indication of one or more resources of a physical random access channel (PRACH) for transmission of messages from the WTRU to the access node and a logical root sequence index for generation of a plurality of random access preambles associated with at least one repetition level, wherein each of the one or more resources correspond to a repetition level associated with transmissions to the access node; andreceive a random access preamble transmitted by the WTRU on a resource of the PRACH; and processing circuitry, communicatively coupled with the communications circuitry, to; detect the resource used by the WTRU for the transmission of the random access preamble; compare the resource used by the WTRU with a plurality of different resources associated with different repetition levels; and determine a repetition level of the WTRU based on the comparison. - View Dependent Claims (15, 16, 17, 18, 19)
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20. An apparatus to be included in an access node, the apparatus comprising:
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communications circuitry to; transmit, to a wireless transmit and receive unit (“
WTRU”
), a system information block that includes a logical root sequence index associated with at least one repetition level to be used by the WTRU for generation of a plurality of random access preambles; andreceive a random access preamble, from the plurality of random access preambles, transmitted from the WTRU on a physical random access channel (PRACH) resource; and processing circuitry, communicatively coupled with the communications circuitry, to determine a repetition level associated with the WTRU based on the random access preamble and the PRACH resource on which the random access preamble was transmitted. - View Dependent Claims (21, 22, 23, 24)
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Specification