455 / | HD | TELECOMMUNICATIONS |
403 | DF | RADIOTELEPHONE SYSTEM {12} |
422 | DF | .~ Zoned or cellular telephone system {14} |
450 | ![]() | .~.~ Channel allocation {4} |
451 | DF | .~.~.~> Hybrid allocation |
452 | DF | .~.~.~> Dynamic allocation |
453 | DF | .~.~.~> Load balancing |
454 | DF | .~.~.~> Spectrum sharing for different type of system (e.g., point-to-point microwave, television, etc.) |