Random access in dynamic and shared spectrums
First Claim
1. A method for assisting a wireless transmit/receive unit (WTRU) to perform random access transmissions in a communication system, the method comprising:
- determining whether the WTRU is to access an operating channel as a secondary user;
determining a silencing period for the WTRU to listen to the operating channel prior to starting a random access channel (RACH) procedure based on a determination that the WTRU is to access the operating channel as a secondary user; and
signaling an indication of the determined silencing period to the WTRU.
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Accused Products
Abstract
Systems and methods for using a communication system in a spectrum are provided. For example, a random access or RACH procedure may be performed where the random access or RACH procedure may be configured to reduce secondary interference and/or to be used in a pixel-based environment. The random access or RACH procedure may include selecting a RACH preamble; sending a RACH preamble and/or format information; determining a transmission power of the RACH preamble and/or the format information; determining a random access radio network temporary identifier (RA-RNTI) and preamble ID associated with the RACH preamble; and/or selecting a physical RACH (PRACH).
7 Citations
20 Claims
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1. A method for assisting a wireless transmit/receive unit (WTRU) to perform random access transmissions in a communication system, the method comprising:
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determining whether the WTRU is to access an operating channel as a secondary user; determining a silencing period for the WTRU to listen to the operating channel prior to starting a random access channel (RACH) procedure based on a determination that the WTRU is to access the operating channel as a secondary user; and signaling an indication of the determined silencing period to the WTRU. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A device for configuring a random access channel (RACH) procedure used by a wireless transmit/receive unit (WTRU) in a communication system, the device comprising a processor configured to:
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determine whether the WTRU is to access an operating channel as a secondary user; determine a silencing period for the WTRU to listen to the operating channel prior to starting a random access channel (RACH) procedure based on a determination that the WTRU is to access the operating channel as a secondary user; and signal an indication of the determined silencing period to the WTRU. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A wireless transmit/receive unit (WTRU) for performing random access transmission in a communication system, the WTRU comprising:
a processor configured to; receive an indication of a silencing period for listening to an operating channel that the WTRU is to operate on as a secondary user; determine whether another secondary user is present in the operating channel during the silencing period; and identify a timing for sending a random access channel (RACH) preamble based on the determination, wherein, based on a determination that another secondary user is present in the operating channel, the WTRU delays sending the RACH preamble until a subsequent available RACH resource, and, based on a determination that the operating channel is free, the WTRU sends the RACH preamble during a current RACH resource. - View Dependent Claims (16, 17, 18, 19, 20)
Specification