FIELD: radio engineering, communication.
SUBSTANCE: described are methods of transmitting location information from a subscriber to a repeater. The subscriber switches from a working channel to a data return channel, transmits a request for a periodic or one-time window to transmit an update, and determines from grant information in the response announcement the allocated window and frame before switching back to the working channel. Before the allocated time, the subscriber switches to the data return channel, confirms whether it remains scheduled to transmit the update from a repeater announcement, and if so, transmits the location update in either the current or reserved window. The announcements from the repeater contain the identity of the next window and frame and the subscriber reserved to use the window in addition to grant information.
EFFECT: subscribers may or may not be time-aligned and the data and data return channels may or may not be synchronised.
16 cl, 17 dwg
