US PATENT SUBCLASS 455 / 422
.~ Zoned or cellular telephone system

Current as of: June, 1999
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455 /   HD   TELECOMMUNICATIONS

403  DF  RADIOTELEPHONE SYSTEM {12}
422.~ Zoned or cellular telephone system {14}
423  DF  .~.~> Diagnostic testing, malfunction indication, or electrical condition measurement {2}
426  DF  .~.~> Including other radio communication system (e.g., cordless telephone, paging, trunking, etc.)
427  DF  .~.~> Space satellite {3}
431  DF  .~.~> Airborne or aircraft
432  DF  .~.~> Roaming {1}
434  DF  .~.~> Control or access channel scanning
435  DF  .~.~> Registration
436  DF  .~.~> Handoff {8}
445  DF  .~.~> Call routing (e.g., to prevent backhaul, routing efficiency, least cost, or alternate routing)
446  DF  .~.~> Including cell planning or layout {3}
450  DF  .~.~> Channel allocation {4}
455  DF  .~.~> Channel seizing
456  DF  .~.~> Location monitoring {1}
458  DF  .~.~> Specific paging technique {2}

DEFINITION

Classification: 455/422

Zoned or cellular telephone system:

(under subclass 403) Subject matter including plural stations providing service to different geos:graphical areas.

(1) Note. Cellular systems are characterized by a large

number of base stations enabling channel reuse.

SEE OR SEARCH CLASS

370, Multiplex Communications,

328+, for multiplex communication in a system having a plurality of contiguous regions served by respective fixed stations.