Hard handoff target generation in a multi-frequency CDMA mobile network
First Claim
1. A method of supporting hard handoff of a mobile station in a wireless communication network comprising:
- maintaining current active set information for the mobile station in a base station controller (BSC) within a source base station subsystem (BSS);
dynamically generating a hard handoff target set identifying one or more CDMA channels or cells as hard handoff targets based on the current active set information responsive to a hard handoff trigger for the mobile station, wherein dynamically generating the hard handoff target set comprises defining a target set size limit on a per CDMA channel basis, such that a size of the hard handoff target set generated for the mobile station is controlled as a function of the mobile station'"'"'s current location; and
transferring target set information for the dynamically generated hard handoff target set from the BSC to a target BSS if the hard handoff is an inter-BSS hard handoff.
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Accused Products
Abstract
A CDMA network dynamically generates hard handoff (HHO) target sets to support mobile station HHO. Dynamically identifying CDMA channels or cells as targets for HHO eliminates the need for statically configured HHO target sets. In an exemplary embodiment, a source BSS identifies a first set of channels corresponding to common neighbor cells of the cells associated with the active set pilots and/or reported PBU pilots. This first set may be adjusted by removing any common neighbor cells that include soft handoff target channels, and by adding selected vertical neighbor channels of the active set pilots and/or reported PBU pilots. Channels in the first set may be grouped by carrier frequency and evaluated based on CDMA channel type, BSS affiliation and characteristics, and the target'"'"'s relationship to the active set to identify a preferred HHO target set. Such operations permit dynamic determination of whether to perform inter- or intra-BSS HHO.
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Citations
51 Claims
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1. A method of supporting hard handoff of a mobile station in a wireless communication network comprising:
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maintaining current active set information for the mobile station in a base station controller (BSC) within a source base station subsystem (BSS); dynamically generating a hard handoff target set identifying one or more CDMA channels or cells as hard handoff targets based on the current active set information responsive to a hard handoff trigger for the mobile station, wherein dynamically generating the hard handoff target set comprises defining a target set size limit on a per CDMA channel basis, such that a size of the hard handoff target set generated for the mobile station is controlled as a function of the mobile station'"'"'s current location; and transferring target set information for the dynamically generated hard handoff target set from the BSC to a target BSS if the hard handoff is an inter-BSS hard handoff. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A base station controller (BSC) to support hard handoff of a mobile station in a wireless communication network comprising processing and control circuits configured to:
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maintain current active set information for a mobile station; dynamically generate a hard handoff target set identifying one or more CDMA channels or cells as hard handoff targets based on the current active set information in response to a hard handoff trigger for the mobile station; and transfer target set information for the dynamically generated hard handoff target set to a target Base Station System (BSS) if a type of hard handoff determined from the dynamically generated target set is an inter-BSS hard handoff; wherein the BSC applies a target set size limit on a per CDMA channel basis, such that a size of the hard handoff target set generated for the mobile station is controlled as a function of the mobile station'"'"'s current location. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51)
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Specification