| CPC H04B 7/18541 (2013.01) [H04B 7/1855 (2013.01); H04W 74/0833 (2013.01)] | 18 Claims |

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1. A method for communication, comprising:
receiving, by a terminal device, a first message from a base station, wherein the first message indicates whether the first message comprises ephemeris information corresponds to a second satellite, wherein the first message is a radio resource control (RRC) message or a system information block (SIB); and
performing, by the terminal device, a third operation in response to a change of a satellite corresponding to the base station for the terminal device, wherein the change comprises a change from a first satellite to the second satellite, and wherein the first satellite and the second satellite correspond to the base station, wherein performing the third operation comprises using a K offset with a value of 0 in response to the change of the satellite.
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