Method and system for performing a handoff in a wireless communication system, such as a hard handoff
First Claim
1. An apparatus comprising:
- a quality measurement circuit;
a power control processor configured to tune to a first frequency during an initial portion of a first frame, to tune to a second frequency during a period that begins during the first frame and continues through an initial portion of a second frame, wherein the second frame follows immediately after the first frame, to direct the quality measurement circuit to measure at least one signal attribute on the second frequency during the period, and to tune the receiver on the first frequency during a remaining portion of the second frame;
wherein said power control processor is further configured to increase a target signal quality over at least a portion of at least one of the first and second frames;
a memory buffer, wherein samples are stored; and
a frequency searcher adapted to simultaneously process said stored samples and said at least one signal received at said first frequency, wherein no pilot searches and pilot strength measurements are made while on said second frequency.
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Abstract
A method for minimizing search time and disruption of current service on an originating frequency during a frequency search excursion to a target frequency as part of an inter-frequency hard handoff between cells on different RF CDMA channels. Disruption of service on the current frequency during the frequency search excursion to the target frequency is minimized by increasing the amount of power allocated to other symbols of two consecutive frames impacted by the search excursion as a function of the search excursion time. The mobile station tunes to a target frequency and collects chip samples, which are stored in a memory buffer. The mobile station returns to the originating frequency to process the collected samples.
75 Citations
30 Claims
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1. An apparatus comprising:
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a quality measurement circuit; a power control processor configured to tune to a first frequency during an initial portion of a first frame, to tune to a second frequency during a period that begins during the first frame and continues through an initial portion of a second frame, wherein the second frame follows immediately after the first frame, to direct the quality measurement circuit to measure at least one signal attribute on the second frequency during the period, and to tune the receiver on the first frequency during a remaining portion of the second frame;
wherein said power control processor is further configured to increase a target signal quality over at least a portion of at least one of the first and second frames;a memory buffer, wherein samples are stored; and a frequency searcher adapted to simultaneously process said stored samples and said at least one signal received at said first frequency, wherein no pilot searches and pilot strength measurements are made while on said second frequency. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method, comprising:
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tuning to a first frequency during an initial portion of a first frame; tuning to a second frequency during a period that begins during the first frame and continues through an initial portion of a second frame, wherein the second frame follows immediately after the first frame; measuring at least one signal attribute on the second frequency during the period; tuning to the first frequency during a remaining portion of the second frame, wherein a target signal quality is increased over at least a portion of at least one of the first and second frames; storing samples; and simultaneously processing said stored samples and said at least one signal received at said first frequency, wherein no pilot searches and pilot strength measurements are made while on said second frequency. - View Dependent Claims (8, 9, 10, 11, 12)
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13. An apparatus, comprising:
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means for tuning to a first frequency during an initial portion of a first frame; means for tuning to a second frequency during a period that begins during the first frame and continues through an initial portion of a second frame, wherein the second frame follows immediately after the first frame; means for measuring at least one signal attribute on the second frequency during the period; means for tuning to the first frequency during a remaining portion of the second frame, wherein a target signal quality is increased over at least a portion of at least one of the first and second frames; means for storing samples; and means for simultaneously processing said, stored samples and said at least one signal received at said first frequency, wherein no pilot searches and pilot strength measurements are made while on said second frequency. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method for minimizing the search time to another frequency, comprising:
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operating a receiver on an original said frequency; operating the receiver on a target said frequency during a search excursion period; measuring at least one signal attribute on the target frequency during the search excursion period; increasing a target of Eb/No of a forward link power control over the original frequency based on duration of the search excursion period; storing samples; and simultaneously processing said stored samples and said at least one signal received at the original frequency, wherein no pilot searches and pilot strength measurements are made while on the target frequency. - View Dependent Claims (20, 21, 22, 23, 24)
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25. An apparatus for minimizing search time to another frequency, comprising:
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a receiver configured to; operate on an original said frequency and on a target, said frequency during a search excursion period; measure at least one signal attribute on the target frequency during the search excursion period; increase a target of Eb/No of a forward link power control over the original frequency based on duration of the search excursion period; a memory buffer configured to store samples; and a frequency searcher configured to simultaneously process said stored samples and said at least one signal received at the original frequency, wherein no pilot searches and pilot strength measurements are made while on the target frequency. - View Dependent Claims (26, 27, 28, 29, 30)
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Specification