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METHOD AND APPARATUS FOR INCREASING TWO TIER MACROCELL/MICROCELL SUBSCRIBER CAPACITY IN A CELLULAR SYSTEM IN WHICH MICROCELL ACCESS BY A MOBILE IS DEPENDENT ON A MOBILE'S VEHICULAR SPEED
METHOD AND APPARATUS FOR INCREASING TWO TIER MACROCELL/MICROCELL SUBSCRIBER CAPACITY IN A CELLULAR SYSTEM IN WHICH MICROCELL ACCESS BY A MOBILE IS DEPENDENT ON A MOBILE'S VEHICULAR SPEED
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机译：在移动系统依赖于手机的微蜂窝接入中，增加蜂窝系统中两个宏/微蜂窝用户容量的方法和装置
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摘要
A particular method for enabling the service of mobiles by a microcell(312), in a two tier cellular system, involves identifying a microcell coverage area(312) and offsetting microcell signal strength for a time sufficient to allow a fastmoving vehicle (345), desiring service and having entered the microcell serving area,to exit the microcell coverage area before the call is set up or handed off forcing thecontrolling macrocell to handle the call setup or handoff. Hence only the mobileradiotelephones of stationary and relatively slow moving vehicles are served by themicrocell.There is a substantial offset-coverage overlap period between thelocations where a mobile may be found during the offset interval or duration of theapparent reduced signal strength of the microcell and the microcell coverage area.Calls that could be serviced by the microcell are instead serviced by the macrocellbecause the mobile radiotelephone responds to the strongest signal.This loss in capacity is solved by reducing the offset-coverage overlap.Offset-coverage overlap is reduced by starting the offset or timed duration (To) inresponse to a broadcast signal sent by the microcell at some predetermined point(352) before the mobile enters (345) the microcell coverage area (312) and byincreasing the length of the offset duration or interval (To) by some predeterminedincrement to prevent service by the microcell to a vehicle exceeding a cutoff speed.For slow moving vehicles there is a net shift to a reduced offset period within themicrocell coverage area and hence proportionately more call setup and handoffrequests of slow moving vehicles can be accommodated.Service permissions for call setup with microcells may also be based oncertain identification associated with mobile radiotelephones.
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