| 摘要 |
A frequency allocation method for allocating carrier frequencies to a plural ity of fixed beams in a cellular radio based transceiver station comprises maint aining a reserve pool of carrier frequencies (1000), such that any available carrie r frequency can be allocated to any fixed beam at any one time in order to dea l with capacity demands from mobile stations within an area covered by a fixed beam (1002). A frequency allocation algorithm operates such as to allow a plurality of transceivers to float anywhere across a plurality of fixed dire ctional beams. More carrier frequencies can be added to a beam to deal with increase d mobile station capacity demand. The occupancy of channels on the carrier frequencies is continuously monitored, and the number of carrier frequencies perbeam is continuously monitored (1001, 1003), with th e object of releasing unusedcarrier frequencies to a reserve pool of carrier frequencies (1005), allowing redeployment of unused carrier frequencies to other beams where necessary (1104). Carrier frequencies are periodically "groomed" by assessing the numb er of vacant channels on the carrier, and reallocating any un-utilized vacant channels to other carrier frequencies. The grooming process can be constrain ed to operate during natural gaps in speech, to avoid channel degradation.</SDO AB>
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