Frequency hopping
First Claim
1. A telecommunications system for selective frequency hopping among a plurality of mobile stations within said system, said system comprising:
- speed measuring means for measuring respective speeds of said plurality of mobile stations;
frequency hopping determining means for selectively determining a frequency hopping sequence for said plurality of mobile stations based upon said respective speeds of said plurality of mobile stations; and
switching means for switching said frequency hopping sequence of said plurality of mobile stations pursuant to said respective speeds.
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Accused Products
Abstract
A system and method in a wireless communications system enables a preferred frequency hopping (FH) sequence to be determined and instituted in real-time. The average speed of mobile stations within a cell is determined or estimated using a variety of techniques. If the average speed is below a predetermined threshold, then a cyclic FH sequence is instituted to achieve superior frequency diversity and therefore combat small-scale fading dips. If the average speed is above a predetermined threshold, then a random FH sequence is instituted to achieve superior interference averaging and therefore combat co-channel interference. Delay timers and a hysteresis may also be used to enhance stability and to counteract short-term fluctuations. The measuring of the average speed and the comparing of the average speed to the threshold are periodically repeated.
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Citations
26 Claims
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1. A telecommunications system for selective frequency hopping among a plurality of mobile stations within said system, said system comprising:
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speed measuring means for measuring respective speeds of said plurality of mobile stations; frequency hopping determining means for selectively determining a frequency hopping sequence for said plurality of mobile stations based upon said respective speeds of said plurality of mobile stations; and switching means for switching said frequency hopping sequence of said plurality of mobile stations pursuant to said respective speeds. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. In a telecommunications system having a plurality of mobile stations, a method for selective frequency hopping of said plurality of mobile stations, said method comprising the steps of:
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measuring respective speeds of said plurality of mobile stations; determining a frequency hopping sequence for said plurality of mobile stations based upon said respective speeds of said plurality of mobile stations; and switching said frequency hopping sequence of said plurality of mobile stations pursuant to said respective speeds. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification