Low Earth Orbit Satellite (LEOS) communication networks have capacities which vary over time. Call Admission Control policies which only use current capacity information may lead to excessive and intolerable dropping of admitted calls whenever the network capacity dcreases. We introudce a Call Admission Control policy for capacity-varying networks such as LEOS. This policy uses knowledge about future capacity changes to admit only calls which can be adequately serviced not just at admission time, but throughout the call's lifetime. Using this new policy, it is possible to trade off some additional call request blockign in order to greatly reduce the incidence of active call dropping. this new policy is optimal in the sense that it blocks the fewest calls and achieves the highest throughput of any policy that meets, on an individual cal baiss, a given dropping probability objective under any fixed order dropping policy.
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