Hand-off between ultra-wideband cell sites
First Claim
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1. A method for performing a soft hand-off in an ultra-wideband cellular communication system, comprising the steps of:
- monitoring signal strength and the bit error rate from a primary source;
monitoring signal strength and the bit error rate from a secondary source;
comparing the strength of the signal and the bit error rate from the primary source to the strength of the signal and the bit error rate from the secondary source or to predetermined levels; and
transferring data reception and transmission from the primary source to the secondary source when the strength of the signal from the secondary source is greater than the strength of the signal of the primary source or when the bit error rate of the secondary source is less than the bit error rate of the primary source or when either signal strength or bit error rate is below a pre-determined level.
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Abstract
Briefly, the present invention provides a dynamic channel re-assignment capability between mobile units, base stations and sectors within base station coverage areas. The wireless devices used in the present invention may include ultra-wideband radio communication devices. Ultra-wideband bandwidth and channel allocation can be effectively managed, even though link quality generally deteriorates near the outer boundary of the base station. By maintaining dual communications with an adjoining base station, the present invention reduces the bit error rate and maintains signal strength.
41 Citations
18 Claims
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1. A method for performing a soft hand-off in an ultra-wideband cellular communication system, comprising the steps of:
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monitoring signal strength and the bit error rate from a primary source;
monitoring signal strength and the bit error rate from a secondary source;
comparing the strength of the signal and the bit error rate from the primary source to the strength of the signal and the bit error rate from the secondary source or to predetermined levels; and
transferring data reception and transmission from the primary source to the secondary source when the strength of the signal from the secondary source is greater than the strength of the signal of the primary source or when the bit error rate of the secondary source is less than the bit error rate of the primary source or when either signal strength or bit error rate is below a pre-determined level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A computer program product for performing a soft hand-off in an ultra-wideband code-based cellular communication system, comprising:
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computer code for monitoring signal strength and the bit error rate from a primary source;
computer code for monitoring signal strength and the bit error rate from a secondary source;
computer code for comparing the strength of the signal and the bit error rate from the primary source to the strength of the signal and the bit error rate from the secondary source or to predetermined levels; and
computer code for transferring data reception and transmission from the primary source to the secondary source when the strength of the signal from the secondary source is greater than the strength of the signal of the primary source or when the bit error rate of the secondary source is less than the bit error rate of the primary source or when either signal strength or bit error rate is below a pre-determined level. - View Dependent Claims (15, 16)
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17. A base station for an ultra-wideband code based cellular communication system comprising:
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means for monitoring signal strength and the bit error rate from the base station, which serve as a primary source;
means for comparing the strength of the signal and the bit error rate from the primary source to predetermined levels; and
means for transferring data reception and transmission to a secondary source. - View Dependent Claims (18)
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Specification