Abstract
Methods and apparatus are described for establishing point-to-point communications and performing forwarding under cellular network control. The WTRU may receive a timing signal from at least one discoverable WTRU controlled by the base station. The searching WTRU may estimate the quality (ie, path loss) of the radio link between the WTRU and the discoverable WTRU and determine (eg, based on a threshold established by the base station) whether to report the estimated radio to the base station controlling the discoverable WTRU. Link quality. The power of the timing signal can be stepped up by a predetermined step size such that the transmission power at any given time is known and can be used by the WTRU to estimate the quality of the radio link. The timing signal can include at least one of a primary preamble or a secondary preamble.
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