FIELD: wireless communication.
SUBSTANCE: receiving, through a wireless transmitting/receiving unit (WTRU) from a network access point (NAP), a plurality of preambles and corresponding thresholds related to propagation delay, and determining information related to propagation delay associated with the distance between the WTRUs and a NAP or a location within the NAP coverage area, then selecting a subset of preambles from the plurality of preambles based on certain information related to propagation delay, randomly selecting a preamble from the selected subset of preambles, and sending the randomly selected NAP preamble.
EFFECT: enabling selection of a subset of preambles from a plurality of preambles based on information related to the propagation delay.
20 cl, 12 dwg
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