Abstract
PROBLEM TO BE SOLVED: To describe a method and apparatus for establishing peer-to-peer communication and performing transfer under the control of a cellular network.SOLUTION: A searching wireless transmission/reception unit (WTRU) can receive a timing signal from at least one discoverable WTRU controlled by a base station. The searching WTRU can estimate the quality of a radio link (i.e., path loss) between the searching WTRU and the discoverable WTRU, and determine whether or not to report the estimated radio link quality to a base station that controls the discoverable WTRU (e.g., based on a threshold established by the base station). The power of the timing signal can be ramped up in predetermined steps such that the transmission power at any given time is known and can be used by the searching WTRU for estimating the radio link quality. The timing signal can include at least one of a primary preamble or a secondary preamble.SELECTED DRAWING: Figure 3A
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