Patent US6535563B2 successfully refreshed from Google Patents.
US6535563B2
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US
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Method and apparatus for coordinating transmission of short messages with hard handoff searches in a wireless communications system
Assignee: Qualcomm Inc
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Filing: 1998-05-21
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Granted: 2003-03-18
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Expires: 2018-05-21
Abstract
Abstract A method and apparatus for coordinating the time at which a mobile station performs searches for alternative systems to which a hard handoff will occur. In one system which includes the present invention, the mobile station receives a command which instructs the mobile station as to when to tune to alternative frequencies in order to search for indicates of the presence of an alternative system. In another system which includes the present invention, predetermined times are defined with respect to a reference point in time that is common to both the origination base station and a mobile station. The mobile station tunes to alternative frequencies to perform searches only during these predetermined times. In addition, the mobile station coordinates the transmission of reports which indicate the results of searches for alternative systems such that these reports are only transmitted from the mobile station when the mobile station is tuned to the origination frequency.
Inventors
- 👤 Edward G. Tiedemann, Jr.
- 👤 Olivier Glauser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:15
CPC Classifications
H; H04; H04W; H04W36/00; H04W36/0005; H04W36/0083; H04W24/00; H04W24/10; H04W28/00; H04W28/02; H04W28/06; H04W36/0085; H04W36/0088; H04W36/0094; H04W36/06; H04W36/14; H04W8/00; H04W8/005; H04L; H04L1/00; H04L1/004; H04L1/0045; H04W36/34; H04W36/38; H04W52/00; H04W52/04; H04W52/38; H04W52/44; H04W88/00; H04W88/02
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
121 words
A method for coordinating times at which a mobile station monitors alternative frequencies with times at which an origination base station transmits short messages, comprising the steps of: a) determining at an origination base station when a mobile station will be tuned to receive frequencies other than an origination frequency; b) tuning, by the mobile station, from the origination frequency to a frequency other than the origination frequency; c) collecting and storing data samples; d) retuning to the origination frequency; and e) transmitting short messages only at times when the mobile station is known to be tuned to receive the origination frequency based on the knowledge of when the mobile station will be tuned to frequencies other than the origination frequency.
Claim 2
Independent Claim
121 words
A method for coordinating times at which a mobile station monitors alternative frequencies with times at which an origination base station transmits short messages, comprising the steps of: a) determining at an origination base station when a mobile station will be tuned to receive frequencies other than an origination frequency; b) tuning, by the mobile station, from the origination frequency to a frequency other than the origination frequency; c) collecting and storing data samples; d) retuning to the origination frequency; and e) transmitting short messages only at times when the mobile station is known to be tuned to receive the origination frequency based on the knowledge of when the mobile station will be tuned to frequencies other than the origination frequency.
Claim 3
Dependent Claim
48 words
The method of claim 1 , wherein the step of determining when the mobile station will be tuned to frequencies other than the origination frequency includes sending a message which commands the mobile station to tune to a frequency other than the origination frequency at a predetermined time.
Claim 4
Dependent Claim
53 words
The method of claim 1 , wherein the step of determining when the mobile station will be tuned to frequencies other than the origination frequency includes sending a message which commands the mobile station to tune to a frequency other than the origination frequency at any time within a predetermined period in time.
Claim 5
Dependent Claim
34 words
The method of claim 1 wherein the mobile station identifies pilot signal offsets at which multipath signals are received by the mobile station from a base station targeted for handoff before executing the handoff.
Claim 6
Dependent Claim
25 words
The method of claim 1 wherein the mobile station narrows a search window over which the mobile station looks for multipath signal assignable for handoff.
Claim 7
Independent Claim
112 words
A method for coordinating times at which a mobile station monitors alternative frequencies with times at which an origination base station transmits short messages, comprising the steps of: a) receiving commands from the origination base station indicating when the mobile station can be tuned to receive frequencies other than an origination frequency; b) tuning, by the mobile station, from the origination frequency to a frequency other than the origination frequency; c) collecting and storing data samples; d) retuning to the origination frequency; and e) determining time periods during which the mobile station will be tuned to frequencies other than the origination frequency based upon the commands received from the origination base station.
Claim 8
Independent Claim
112 words
A method for coordinating times at which a mobile station monitors alternative frequencies with times at which an origination base station transmits short messages, comprising the steps of: a) receiving commands from the origination base station indicating when the mobile station can be tuned to receive frequencies other than an origination frequency; b) tuning, by the mobile station, from the origination frequency to a frequency other than the origination frequency; c) collecting and storing data samples; d) retuning to the origination frequency; and e) determining time periods during which the mobile station will be tuned to frequencies other than the origination frequency based upon the commands received from the origination base station.
Claim 9
Dependent Claim
84 words
In a wireless communication system, a method for minimizing loss of data in a communication link between a mobile station and a base station while searching for a suitable system with which a mobile assisted hard handoff will later be executed comprising: communicating with an origination base station on a first frequency; tuning to a second frequency from the first frequency; storing data samples received on the second frequency; retuning to the first frequency; and searching the stored data samples for pilot signal offsets.
Claim 10
Dependent Claim
84 words
In a wireless communication system, a method for minimizing loss of data in a communication link between a mobile station and a base station while searching for a suitable system with which a mobile assisted hard handoff will later be executed comprising: communicating with an origination base station on a first frequency; tuning to a second frequency from the first frequency; storing data samples received on the second frequency; retuning to the first frequency; and searching the stored data samples for pilot signal offsets.
Claim 11
Dependent Claim
39 words
The method of claim 7 further comprising: recovering information not received by the mobile station while tuned to the second frequency by applying error correction coding to information received by the mobile station while tuned to the first frequency.
Claim 12
Dependent Claim
54 words
The method of claim 8 further comprising increasing the amount of transmit power at the origination base station when information is being transmitted on the first frequency that will be used by the mobile station for recovering information not received by the mobile station while tuned to the second frequency by applying error correction.
Claim 13
Dependent Claim
15 words
The method of claim 8 wherein the error correction coding comprises block encoding and interleaving.
Claim 14
Dependent Claim
26 words
The method of claim 9 further comprising delaying puncturing power control commands onto the first frequency when the origination base station is transmitting full rate frames.
Claim 15
Dependent Claim
40 words
The method of claim 7 further comprising providing a window in time during which the mobile station can be tuned to the second frequency without loss of data by removing redundant information transmitted at lower rates over the first frequency.
Claim 16
Dependent Claim
191 words
A base station apparatus for minimizing loss of data in a communication link between a mobile station and a base station while searching for a suitable system with which a mobile assisted hard handoff will later be executed comprising: a forward link power control mechanism for determining a forward link power control index; a boost mode multiplier for increasing a relative output power level at which data is transferred during a portion of a current data frame to produce a boost mode data frame having a power level determined by the forward link power control index; a data rate multiplier for increasing a data rate during a portion of a current data frame to produce a boost mode data frame having an increased data rate determined by a data rate multiplier; a block interleaver for error correction coding of boost mode data frames; a convolutional encoder for error correction coding of boost mode data frames; a symbol repeater for creating symbol repetition in less than full rate boost mode data frames; and a multiplexer for controlling puncture of power control commands into boost mode data frames on a forward link channel.
Claim 17
Dependent Claim
191 words
A base station apparatus for minimizing loss of data in a communication link between a mobile station and a base station while searching for a suitable system with which a mobile assisted hard handoff will later be executed comprising: a forward link power control mechanism for determining a forward link power control index; a boost mode multiplier for increasing a relative output power level at which data is transferred during a portion of a current data frame to produce a boost mode data frame having a power level determined by the forward link power control index; a data rate multiplier for increasing a data rate during a portion of a current data frame to produce a boost mode data frame having an increased data rate determined by a data rate multiplier; a block interleaver for error correction coding of boost mode data frames; a convolutional encoder for error correction coding of boost mode data frames; a symbol repeater for creating symbol repetition in less than full rate boost mode data frames; and a multiplexer for controlling puncture of power control commands into boost mode data frames on a forward link channel.
Claim 18
Dependent Claim
30 words
The apparatus of claim 13 wherein the multiplexer for controlling puncture of power control commands on a forward link channel is configured to delay the puncturing of power control commands.
Claim 19
Independent Claim
175 words
A method of boosting, at a base station, an output power level of a portion of a pair of data frames to ensure that an error correction code will be capable of determining information that is transmitted over a first frequency during the time a mobile station receiver is tuned to a second frequency comprising: sending, from a base station to a mobile station, a message identifying an elected frame pair comprising a first frame and second frame; increasing a forward link power control index; transmitting a portion of the first frame of the identified elected frame pair at a power level determined by the increased forward link power control index; interrupting forward link transmission during a second portion of the first frame of the elected frame pair and a first portion of the second frame of the elected frame pair; transmitting a second portion of the second frame of the elected frame pair at a power level determined by the increased forward link power control index; and resetting the forward link power control index.
Claim 20
Independent Claim
175 words
A method of boosting, at a base station, an output power level of a portion of a pair of data frames to ensure that an error correction code will be capable of determining information that is transmitted over a first frequency during the time a mobile station receiver is tuned to a second frequency comprising: sending, from a base station to a mobile station, a message identifying an elected frame pair comprising a first frame and second frame; increasing a forward link power control index; transmitting a portion of the first frame of the identified elected frame pair at a power level determined by the increased forward link power control index; interrupting forward link transmission during a second portion of the first frame of the elected frame pair and a first portion of the second frame of the elected frame pair; transmitting a second portion of the second frame of the elected frame pair at a power level determined by the increased forward link power control index; and resetting the forward link power control index.
Claim 21
Dependent Claim
20 words
The method of claim 15 wherein the increasing the forward link power control index comprises disabling a power control subchannel.
Claim 22
Dependent Claim
20 words
The method of claim 15 wherein the resetting the forward link power control index comprises enabling a power control subchannel.
Claim 23
Independent Claim
157 words
A method of boosting, at a base station, a data rate of a portion of a pair of data frames to ensure that an error correction code will be capable of determining information that is transmitted over a first frequency during the time a mobile station receiver is tuned to a second frequency comprising: sending, from a base station to a mobile station, a message identifying an elected frame pair comprising a first frame and a second frame; transmitting a portion of the first frame of the identified elected frame pair at an increased data rate determined by a data rate multiplier; interrupting forward link transmission during a second portion of the first frame of the elected frame pair and a first portion of the second frame of the elected frame pair; and transmitting a second portion of the second frame of the elected frame pair at the increased data rate determined by the data rate multiplier.
Claim 24
Independent Claim
157 words
A method of boosting, at a base station, a data rate of a portion of a pair of data frames to ensure that an error correction code will be capable of determining information that is transmitted over a first frequency during the time a mobile station receiver is tuned to a second frequency comprising: sending, from a base station to a mobile station, a message identifying an elected frame pair comprising a first frame and a second frame; transmitting a portion of the first frame of the identified elected frame pair at an increased data rate determined by a data rate multiplier; interrupting forward link transmission during a second portion of the first frame of the elected frame pair and a first portion of the second frame of the elected frame pair; and transmitting a second portion of the second frame of the elected frame pair at the increased data rate determined by the data rate multiplier.
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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) | 2006-03-17 | 2006-09-16 | 2007-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-03-17 | 2010-09-16 | 2011-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-03-17 | 2014-09-16 | 2015-03-18 | $7700.00 | Window Closed / Lapsed |