ADJUSTING UPLINK SYNCHRONIZATION TIMER

Disclosed is a method comprising adjusting one or more timers associated with uplink synchronization based at least partly on at least one of: a velocity of the apparatus, a velocity of a satellite, a movement direction of the apparatus, a movement direction of the satellite, a relative speed between the apparatus and the satellite, an accuracy of ephemeris information associated with the satellite, an orbit propagator model associated with the satellite, a first elevation angle between the apparatus and the satellite, a second elevation angle between a base station and the satellite, an accuracy of location information provided by a global navigation satellite system, an accuracy requirement for timing advance estimation performed by the apparatus, and/or a common timing advance broadcast rate.