| CPC H04W 56/0045 (2013.01) [H04B 7/18513 (2013.01); H04W 56/0005 (2013.01); H04W 74/0833 (2013.01)] | 12 Claims |

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1. A method performed by a wireless transmit and receive unit (WTRU), the method comprising:
receiving, from a spaceborne satellite, system information that includes a position of, and trajectory parameters about, the spaceborne satellite;
determining a position of the WTRU using a global navigation satellite system (GNSS);
determining a timing advance (TA) based on the determined WTRU position and the system information wherein the determined TA provides for compensation for a round trip time (RTT) between the WTRU and the spaceborne satellite; and
transmitting a signal using the TA.
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