Claims
- 1. A method for managing an active set of radio channels used in soft hand-off processing, the method carried out in a remote unit having an adaptive antenna, the method comprising the steps of:
determining an initial list of members for the active set; making a change in an operating state of the adaptive antenna; and requalifying the active set with the changed adaptive antenna operating state.
- 2. A method as in claim 1 wherein the adaptive antenna is a directional antenna array.
- 3. A method as in claim 2 wherein the adaptive antenna is a phased array.
- 4. A method as in claim 3 wherein the adaptive antenna uses multiple receivers and signal combiners.
- 5. A method as in claim 1 additionally comprising the steps of:
determining a reliability parameter for selecting members of the active set; designating a selected one of the reliability parameters as sufficient to maintain a reliable connection; and upon determining that more than one active set member is a reliable connection, changing operational state of the adaptive antenna to reduce a number of radio channel signals received.
- 6. A method as in claim 5 wherein the measure of reliability is selected from a group consisting of received signal strength indication, correlated power, and measurements of signal to noise ratio.
- 7. A method as in claim 1 additionally comprising the step of, when a number of members of the active set is less than a desired number:
adjusting the antenna state to capture additional radio signals to be possible members of the active set; and requalifying the active set members.
- 8. A method as in claim 1 additionally comprising the step of, if a member of the active set is not reliable:
selecting a new setting for the adaptive antenna; and requalifying active set members.
- 9. A method as in claim 1 additionally comprising the step of, when members of the active set are deemed unreliable:
steering the antenna such that additional radio signals are detected.
- 10. A method as in claim 1 additionally comprising the step of:
if candidate pilot channel signals are determined unreliable but of sufficient quality, periodically selecting a new antenna operating state such that criteria for receiving at least one radio signal is not satisfied.
- 11. A method as in claim 11 wherein the members of the active set are pilot channel signals.
RELATED APPLICATION
[0001] This application claims the benefit of U.S. Provisional Application No. 60/363,227, filed on Mar. 8, 2002. The entire teachings of the above application are incorporated herein by reference.
Provisional Applications (1)
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Number |
Date |
Country |
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60363227 |
Mar 2002 |
US |