US6810254B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for performing mobile assisted hard handoff between communication systems
Assignee: Qualcomm Inc
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Filing: 2001-09-04
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Granted: 2004-10-26
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Expires: 2021-09-04
Abstract
Abstract A method and apparatus for performing inter-system hard handoff between communication systems or inter-frequency hard handoff within a CDMA communication system is disclosed. The purpose is to reduce the probability of dropped calls during inter-system hard handoff. In the event that a hard handoff attempt is unsuccessful, the mobile station will return to the original system with information which the communication system of the present invention uses to assist in the performance of future handoff attempts. Alternatively, with no handoff attempt made, the mobile station monitors the destination system then returns to the original system with information used to assist in subsequent handoff attempts. The information returned from monitoring a CDMA system consists of results of a search for one or more pilots given at offsets in a specific list provided to the mobile station by the base station or a set of offsets based upon a predetermined search algorithm.
Inventors
- 👤 Edward G. Tiedemann, Jr.
- 👤 Tao Chen
- 👤 Charles E. Wheatley, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:55
CPC Classifications
H; H04; H04W; H04W36/00; H04W36/0005; H04W36/0083; H04W36/0085; H04W36/0094; H04W36/0055; H04W36/0066; H04W36/0079; H04W36/0061; H04W36/14; H04W36/24; H04W36/30; Y; Y02; Y02D; Y02D30/00; Y02D30/70
Claims Analysis
Total Claims: 42
Claim 1
Independent Claim
99 words
A method of providing handoff of a mobile station from an origination system operating at a first frequency to a destination system operating at a second frequency, the method comprising: receiving from the origination system a first message directing the mobile station to perform a hard handoff to the destination system; tuning, at the mobile station, to the second frequency; measuring, at the mobile station, a total received pilot energy received at said second frequency; and sending at said first frequency from the mobile station to the origination system a second message based on the total received pilot energy.
Claim 2
Independent Claim
99 words
A method of providing handoff of a mobile station from an origination system operating at a first frequency to a destination system operating at a second frequency, the method comprising: receiving from the origination system a first message directing the mobile station to perform a hard handoff to the destination system; tuning, at the mobile station, to the second frequency; measuring, at the mobile station, a total received pilot energy received at said second frequency; and sending at said first frequency from the mobile station to the origination system a second message based on the total received pilot energy.
Claim 3
Dependent Claim
31 words
The method of claim 1 further comprising receiving from the origination system a set of parameters comprising instructions to the mobile station in the event of a failed hard handoff attempt.
Claim 4
Dependent Claim
20 words
The method of claim 1 wherein said second message further comprises measurements from a search performed at the second frequency.
Claim 5
Independent Claim
97 words
A method of providing handoff of a mobile station from an origination system operating at a first frequency to a destination system operating at a second frequency, the method comprising: receiving from the origination system a first message directing the mobile station to perform a hard handoff to the destination system; tuning, at the mobile station, to the second frequency; measuring, at the mobile station, a total received power received at said second frequency; and sending at said first frequency from the mobile station to the origination system a second message based on the total received power.
Claim 6
Independent Claim
97 words
A method of providing handoff of a mobile station from an origination system operating at a first frequency to a destination system operating at a second frequency, the method comprising: receiving from the origination system a first message directing the mobile station to perform a hard handoff to the destination system; tuning, at the mobile station, to the second frequency; measuring, at the mobile station, a total received power received at said second frequency; and sending at said first frequency from the mobile station to the origination system a second message based on the total received power.
Claim 7
Dependent Claim
32 words
The method of claim 4 further comprising receiving from the origination system a set of additional parameters comprising instructions to the mobile station in the event of a failed hard handoff attempt.
Claim 8
Dependent Claim
20 words
The method of claim 4 wherein said second message further comprises measurements from a search performed at the second frequency.
Claim 9
Dependent Claim
112 words
A computer readable medium containing computer-executable instructions embodying a method of providing handoff of a mobile station from an origination system operating at a first frequency to a destination system operating at a second frequency, comprising: receiving from the origination system at least one PN offset associated with the destination system and a minimum total received pilot value; tuning, at the mobile station, to the second frequency; determining a pilot energy associated with the at least one PN offset received at the mobile station; comparing the determined pilot energy with the minimum total received pilot value; and sending, from the mobile station to the origination system, a message based on said comparing.
Claim 10
Dependent Claim
112 words
A computer readable medium containing computer-executable instructions embodying a method of providing handoff of a mobile station from an origination system operating at a first frequency to a destination system operating at a second frequency, comprising: receiving from the origination system at least one PN offset associated with the destination system and a minimum total received pilot value; tuning, at the mobile station, to the second frequency; determining a pilot energy associated with the at least one PN offset received at the mobile station; comparing the determined pilot energy with the minimum total received pilot value; and sending, from the mobile station to the origination system, a message based on said comparing.
Claim 11
Dependent Claim
15 words
The computer readable medium of claim 7 wherein said message comprises said determined pilot energy.
Claim 12
Dependent Claim
33 words
The computer readable medium of claim 7 wherein said receiving further comprises receiving from the origination system a set of parameters comprising instructions to the mobile station following a failed hard handoff attempt.
Claim 13
Dependent Claim
15 words
The computer readable medium of claim 9 wherein said sending is based on said instructions.
Claim 14
Dependent Claim
20 words
The computer readable medium of claim 7 further comprising performing a search at the second frequency based on said comparing.
Claim 15
Dependent Claim
17 words
The computer readable medium of claim 11 wherein said performing a search is based on said instructions.
Claim 16
Dependent Claim
120 words
A computer readable medium containing computer-executable instructions embodying a method of providing handoff of a mobile station from an origination system operating at a first frequency to a destination system operating at a second frequency, comprising: receiving from the origination system at least one PN offset associated with the destination system and a received power threshold; tuning, at the mobile station, to the second frequency; determining a pilot energy associated with the at least one PN offset received at the mobile station; measuring in-band energy received by the mobile station at the second frequency; comparing the measured in-band energy with the received power threshold; and sending, from the mobile station to the origination system, a message based on said comparing.
Claim 17
Dependent Claim
120 words
A computer readable medium containing computer-executable instructions embodying a method of providing handoff of a mobile station from an origination system operating at a first frequency to a destination system operating at a second frequency, comprising: receiving from the origination system at least one PN offset associated with the destination system and a received power threshold; tuning, at the mobile station, to the second frequency; determining a pilot energy associated with the at least one PN offset received at the mobile station; measuring in-band energy received by the mobile station at the second frequency; comparing the measured in-band energy with the received power threshold; and sending, from the mobile station to the origination system, a message based on said comparing.
Claim 18
Dependent Claim
15 words
The computer readable medium of claim 13 wherein said message comprises said measured in-band energy.
Claim 19
Dependent Claim
34 words
The computer readable medium of claim 13 wherein said receiving further comprises receiving from the origination system a set of additional parameters comprising instructions to the mobile station following a failed hard handoff attempt.
Claim 20
Dependent Claim
15 words
The computer readable medium of claim 15 wherein said sending is based on said instructions.
Claim 21
Dependent Claim
20 words
The computer readable medium of claim 13 further comprising performing a search at the second frequency based on said comparing.
Claim 22
Dependent Claim
17 words
The computer readable medium of claim 17 wherein said performing a search is based on said instructions.
Claim 23
Dependent Claim
140 words
A computer readable medium containing computer-executable instructions embodying a method of providing handoff of a mobile station from an origination system operating at a first frequency to a destination system operating at a second frequency, comprising: sending from the origination system to the mobile station at least one PN offset associated with the destination system and a minimum total received pilot value; sending from the origination system to the mobile station a message directing the mobile station to perform a hard handoff to the destination system; receiving at the origination system from the mobile station a message based on a total received pilot value measured by the mobile station at the second frequency; and sending to the mobile station at least one adjusted PN offset having a different value than said at least one PN offset based on said message.
Claim 24
Dependent Claim
140 words
A computer readable medium containing computer-executable instructions embodying a method of providing handoff of a mobile station from an origination system operating at a first frequency to a destination system operating at a second frequency, comprising: sending from the origination system to the mobile station at least one PN offset associated with the destination system and a minimum total received pilot value; sending from the origination system to the mobile station a message directing the mobile station to perform a hard handoff to the destination system; receiving at the origination system from the mobile station a message based on a total received pilot value measured by the mobile station at the second frequency; and sending to the mobile station at least one adjusted PN offset having a different value than said at least one PN offset based on said message.
Claim 25
Dependent Claim
38 words
The computer readable medium of claim 19 wherein said sending to the mobile station further comprises sending to the mobile station a set of additional parameters comprising instructions to the mobile station following a failed hard handoff attempt.
Claim 26
Dependent Claim
21 words
The computer readable medium of claim 19 wherein said message further comprises measurements from a search performed at the second frequency.
Claim 27
Dependent Claim
136 words
A computer readable medium containing computer-executable instructions embodying a method of providing handoff of a mobile station from an origination system operating at a first frequency to a destination system operating at a second frequency, comprising: sending from the origination system to the mobile station at least one PN offset associated with the destination system and a received power threshold; sending from the origination system to the mobile station a message directing the mobile station to perform a hard handoff to the destination system; receiving at the origination system from the mobile station a message based on a received power measured by the mobile station at the second frequency; and sending to the mobile station at least one adjusted PN offset having a different value than said at least one PN offset based on said message.
Claim 28
Dependent Claim
136 words
A computer readable medium containing computer-executable instructions embodying a method of providing handoff of a mobile station from an origination system operating at a first frequency to a destination system operating at a second frequency, comprising: sending from the origination system to the mobile station at least one PN offset associated with the destination system and a received power threshold; sending from the origination system to the mobile station a message directing the mobile station to perform a hard handoff to the destination system; receiving at the origination system from the mobile station a message based on a received power measured by the mobile station at the second frequency; and sending to the mobile station at least one adjusted PN offset having a different value than said at least one PN offset based on said message.
Claim 29
Dependent Claim
38 words
The computer readable medium of claim 22 wherein said sending to the mobile station further comprises sending to the mobile station a set of additional parameters comprising instructions to the mobile station following a failed hard handoff attempt.
Claim 30
Dependent Claim
21 words
The computer readable medium of claim 22 wherein said message further comprises measurements from a search performed at the second frequency.
Claim 31
Dependent Claim
121 words
A digital signal processing apparatus for performing handoff from an origination system operating at a first frequency to a destination system operating at a second frequency, comprising: memory; and a digital signal processing unit communicatively coupled to said memory, the digital signal processor capable of executing instructions and data to perform the handoff by: receiving from the origination system a first message directing the mobile station to perform a hard handoff to the destination system; tuning, at the mobile station, to the second frequency; measuring, at the mobile station, a total received power received at said second frequency; and sending at said first frequency from the mobile station to the origination system a second message based on the total received power.
Claim 32
Dependent Claim
121 words
A digital signal processing apparatus for performing handoff from an origination system operating at a first frequency to a destination system operating at a second frequency, comprising: memory; and a digital signal processing unit communicatively coupled to said memory, the digital signal processor capable of executing instructions and data to perform the handoff by: receiving from the origination system a first message directing the mobile station to perform a hard handoff to the destination system; tuning, at the mobile station, to the second frequency; measuring, at the mobile station, a total received power received at said second frequency; and sending at said first frequency from the mobile station to the origination system a second message based on the total received power.
Claim 33
Dependent Claim
130 words
A digital signal processing apparatus for performing handoff from an origination system operating at a first frequency to a destination system operating at a second frequency, comprising: memory; and a digital signal processing unit communicatively coupled to said memory, the digital signal processor capable of executing instructions and data to perform the handoff by: receiving from the origination system at least one PN offset associated with the destination system and a minimum total received pilot value; tuning, at the mobile station, to the second frequency; determining a pilot energy associated with the at least one PN offset received at the mobile station; comparing the determined pilot energy with the minimum total received pilot value; and sending, from the mobile station to the origination system, a message based on said comparing.
Claim 34
Dependent Claim
130 words
A digital signal processing apparatus for performing handoff from an origination system operating at a first frequency to a destination system operating at a second frequency, comprising: memory; and a digital signal processing unit communicatively coupled to said memory, the digital signal processor capable of executing instructions and data to perform the handoff by: receiving from the origination system at least one PN offset associated with the destination system and a minimum total received pilot value; tuning, at the mobile station, to the second frequency; determining a pilot energy associated with the at least one PN offset received at the mobile station; comparing the determined pilot energy with the minimum total received pilot value; and sending, from the mobile station to the origination system, a message based on said comparing.
Claim 35
Dependent Claim
112 words
A mobile station apparatus for performing handoff from an origination system operating at a first frequency to a destination system operating at a second frequency, the mobile station apparatus comprising: means for receiving from the origination system at least one PN offset associated with the destination system and a minimum total received pilot value; means for tuning, at the mobile station, to the second frequency; means for determining a pilot energy associated with the at least one PN offset received at the mobile station; means for comparing the determined pilot energy with the minimum total received pilot value; and means for sending a message to the origination system based on said comparing.
Claim 36
Dependent Claim
112 words
A mobile station apparatus for performing handoff from an origination system operating at a first frequency to a destination system operating at a second frequency, the mobile station apparatus comprising: means for receiving from the origination system at least one PN offset associated with the destination system and a minimum total received pilot value; means for tuning, at the mobile station, to the second frequency; means for determining a pilot energy associated with the at least one PN offset received at the mobile station; means for comparing the determined pilot energy with the minimum total received pilot value; and means for sending a message to the origination system based on said comparing.
Claim 37
Dependent Claim
126 words
A mobile station apparatus for performing handoff from an origination system operating at a first frequency to a destination system operating at a second frequency, the mobile station apparatus comprising: means for receiving from the origination system at least one PN offset associated with the destination system and a received power threshold; means for tuning, at the mobile station, to the second frequency; means for determining a pilot energy associated with the at least one PN offset received at the mobile station; means for measuring in-band energy received by the mobile station at the second frequency; means for comparing the measured in-band energy with the received power threshold; and means for sending a message based on said comparing to the origination system at the first frequency.
Claim 38
Dependent Claim
126 words
A mobile station apparatus for performing handoff from an origination system operating at a first frequency to a destination system operating at a second frequency, the mobile station apparatus comprising: means for receiving from the origination system at least one PN offset associated with the destination system and a received power threshold; means for tuning, at the mobile station, to the second frequency; means for determining a pilot energy associated with the at least one PN offset received at the mobile station; means for measuring in-band energy received by the mobile station at the second frequency; means for comparing the measured in-band energy with the received power threshold; and means for sending a message based on said comparing to the origination system at the first frequency.
Claim 39
Dependent Claim
92 words
A communication system apparatus comprising: means for sending at a first frequency to a mobile station a minimum total received pilot value and at least one PN offset associated with a destination system operating at a second frequency; means for receiving from the mobile station a message based on a total received pilot value measured by the mobile station at the second frequency; and means for sending to the mobile station at least one adjusted PN offset having a different value than said at least one PN offset based on said message.
Claim 40
Dependent Claim
92 words
A communication system apparatus comprising: means for sending at a first frequency to a mobile station a minimum total received pilot value and at least one PN offset associated with a destination system operating at a second frequency; means for receiving from the mobile station a message based on a total received pilot value measured by the mobile station at the second frequency; and means for sending to the mobile station at least one adjusted PN offset having a different value than said at least one PN offset based on said message.
Claim 41
Dependent Claim
115 words
A communication system apparatus comprising: method of providing handoff of a mobile station from an origination system operating at a first frequency to a destination system operating at a second frequency, comprising: means for sending at a first frequency to a mobile station a received power threshold and at least one PN offset associated with a destination system operating at a second frequency; means for receiving from the mobile station a message based on a received power measured by the mobile station at the second frequency; and means for sending to the mobile station at least one adjusted PN offset having a different value than said at least one PN offset based on said message.
Claim 42
Dependent Claim
115 words
A communication system apparatus comprising: method of providing handoff of a mobile station from an origination system operating at a first frequency to a destination system operating at a second frequency, comprising: means for sending at a first frequency to a mobile station a received power threshold and at least one PN offset associated with a destination system operating at a second frequency; means for receiving from the mobile station a message based on a received power measured by the mobile station at the second frequency; and means for sending to the mobile station at least one adjusted PN offset having a different value than said at least one PN offset based on said message.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2007-10-26 | 2008-04-26 | 2008-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-10-26 | 2012-04-26 | 2012-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-10-26 | 2016-04-26 | 2016-10-26 | $7700.00 | Window Closed / Lapsed |