Patent ID: 6072985
Filing Date: 2000-06-06
Classification: H04B,H04W

Abstract:
A cellular communications system comprising:at least one site including an antenna, and a transmitter and a receiver coupled to said antenna, for transmitting information and control signals to, and for receiving information signals from, at least one user terminal within the beam of said antenna, and wherein said control signals include at least first control signal portions which have a predetermined transmitted power, and second control signal portions which have a power greater than said predetermined power, said site including a power source which energizes said transmitter and said receiver,CHARACTERIZED IN THATsaid site is on a spacecraft, and said antenna produces multiple beams, each of which is directed toward a different terrestrial footprint in the region being served by said cellular communications system, and control of said communications system is established by at least a terrestrial network control center lying in a footprint, said power source having limited resources for powering said transmitter and said receiver, said network control center generating only one of said control signals on each of said spot beams in order to reduce the amount of power required from said spacecraft power source,whereby, if said second portions of said control signals occur simultaneously, the peak power required from said power source will require a particular peak power capability from said power source,said network control center producing said control signals in a relative phase such that said second portions of said control signal are mutually displaced in time in such a manner as to tend to minimize said peak power.