Patent US5682602A successfully refreshed from Google Patents.
US5682602A
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Method and apparatus for decreasing modem retraining due to blank and burst signalling in analog cellular systems
Assignee: Sierra Wireless ULC
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Filing: 1996-03-01
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Granted: 1997-10-28
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Expires: 2016-03-01
Abstract
Abstract Modem throughput across a cellular mobile telephone network is increased by controlling the response of the modem to blank and burst orders. In the case of a power control order, the modem may be made aware of the fact that the channel has not changed. Significant performance gain in terms of channel throughput can then be achieved by avoiding a lengthy retraining procedure. The modem operation may be suspended during the blank and burst order and enabled after the blank and burst order, avoiding an unnecessary retrain procedure during the blanking period. In the case of a handoff, the modem may be directed to immediately perform a retrain procedure rather than wait for the long blanking period to be detected by the modem or the link access procedure.
Inventors
- 👤 Michael Rodney Walker
- 👤 Peter Robert Henderson McConnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:06
CPC Classifications
H; H04; H04W; H04W36/00; H04W36/02; H04W52/00; H04W52/02; H04W52/0209; H04W52/0212; H04W52/0216; Y; Y02; Y02D; Y02D30/00; Y02D30/70
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
145 words
In a cellular mobile data communications system comprising at least one base station, a mobile station having a communications receiver including a modem with an adaptive equalizer, and means for establishing a wireless communications link between the mobile station and a first base station, a method comprising the steps of: receiving at the modem user data communicated from the first base station across the wireless communications link; detecting at the mobile station a blank and burst sequence associated with an order from the first base station; during the blank and burst sequence, ceasing to receive at the modem user data communicated from the first base station across the wireless communications link; and following the blank and burst sequence, again receiving at the mobile station, without retraining the adaptive equalizer of the modem, user data communicated from the first base station across the wireless communications link.
Claim 2
Dependent Claim
145 words
In a cellular mobile data communications system comprising at least one base station, a mobile station having a communications receiver including a modem with an adaptive equalizer, and means for establishing a wireless communications link between the mobile station and a first base station, a method comprising the steps of: receiving at the modem user data communicated from the first base station across the wireless communications link; detecting at the mobile station a blank and burst sequence associated with an order from the first base station; during the blank and burst sequence, ceasing to receive at the modem user data communicated from the first base station across the wireless communications link; and following the blank and burst sequence, again receiving at the mobile station, without retraining the adaptive equalizer of the modem, user data communicated from the first base station across the wireless communications link.
Claim 3
Dependent Claim
12 words
The method of claim 1, wherein the order is a power-control order.
Claim 4
Dependent Claim
35 words
The method of claim 2, wherein the step of ceasing to receive comprises deasserting a ready for sending signal indicated by transmitting a predetermined signalling sequence from the mobile station to the first base station.
Claim 5
Dependent Claim
18 words
The method of claim 3, wherein the step of again receiving comprises asserting the ready for sending signal.
Claim 6
Dependent Claim
107 words
The method of claim 2, wherein the cellular mobile data communications system further comprises a second station having a communications receiver, and means for establishing a communications link between the second station and the first base station, the method comprising the further steps of: transmitting from the mobile station to the base station on a reverse channel a confirmation message during a second blank and burst sequence; and during an interval encompassing the second blank and burst sequence, transmitting data from the mobile station to the second station through the first base station so as to prevent the second station from initiating retraining of its communications receiver.
Claim 7
Dependent Claim
17 words
The method of claim 5, wherein the step of transmitting data comprises initiating a rate negotiation procedure.
Claim 8
Dependent Claim
28 words
The method of claim 6, wherein, during the rate negotiation procedure, the mobile station first transmits to the second station dummy rate information, followed by genuine rate information.
Claim 9
Dependent Claim
25 words
The method of claim 7, wherein the genuine rate information indicates a same rate as a communications rate previous to the blank and burst sequence.
Claim 10
Dependent Claim
145 words
In a cellular mobile data communications system comprising at least one base station, a mobile station having a communications receiver, means for establishing a wireless communications link between the mobile station and a first base station, a second station having a communications receiver, and means for establishing a communications link between the second station and the first base station, a method comprising the steps of: detecting at the mobile station a blank and burst sequence associated with an order from the first base station; and in conjunction with the blank and burst sequence, transmitting a retraining request having an extended preamble sequence from the mobile station to the second station through the first base station so as to initiate retraining of the second station's communications receiver, the extended preamble sequence having a duration such that it ends after the blank and burst signal has ended.
Claim 11
Dependent Claim
145 words
In a cellular mobile data communications system comprising at least one base station, a mobile station having a communications receiver, means for establishing a wireless communications link between the mobile station and a first base station, a second station having a communications receiver, and means for establishing a communications link between the second station and the first base station, a method comprising the steps of: detecting at the mobile station a blank and burst sequence associated with an order from the first base station; and in conjunction with the blank and burst sequence, transmitting a retraining request having an extended preamble sequence from the mobile station to the second station through the first base station so as to initiate retraining of the second station's communications receiver, the extended preamble sequence having a duration such that it ends after the blank and burst signal has ended.
Claim 12
Dependent Claim
12 words
The method of claim 9, wherein the order is a handoff order.
Claim 13
Dependent Claim
38 words
The method of claim 10, wherein the step of transmitting data comprises transmitting an-extended length preamble sequence of a duration greater than a typical handoff channel blanking interval by an amount greater than a specified minimum preamble length.
Claim 14
Dependent Claim
149 words
In a cellular mobile data communications system comprising at least one base station, a mobile station having a communications receiver including a modem with an adaptive equalizer, and means for establishing a wireless communications link between the mobile station and a first base station, an apparatus comprising: means for receiving at the modem user data communicated from the first base station across the wireless communications link; means for detecting at the mobile station a blank and burst sequence associated with an order from the first base station; means for, during the blank and burst sequence, ceasing to receive at the modem user data communicated from the first base station across the wireless communications link; and means for, following the blank and burst sequence, again receiving at the modem, without retraining the adaptive equalizer of the modem, user data communicated from the first base station across the wireless communications link.
Claim 15
Dependent Claim
149 words
In a cellular mobile data communications system comprising at least one base station, a mobile station having a communications receiver including a modem with an adaptive equalizer, and means for establishing a wireless communications link between the mobile station and a first base station, an apparatus comprising: means for receiving at the modem user data communicated from the first base station across the wireless communications link; means for detecting at the mobile station a blank and burst sequence associated with an order from the first base station; means for, during the blank and burst sequence, ceasing to receive at the modem user data communicated from the first base station across the wireless communications link; and means for, following the blank and burst sequence, again receiving at the modem, without retraining the adaptive equalizer of the modem, user data communicated from the first base station across the wireless communications link.
Claim 16
Dependent Claim
146 words
In a cellular mobile data communications system comprising at least one base station, a mobile station having a communications receiver, means for establishing a wireless communications link between the mobile station and a first base station, a second station having a communications receiver, and means for establishing a communications link between the second station and the first base station, an apparatus comprising: means for detecting at the mobile station a blank and burst sequence associated with an order form the first base station; and means for, in conjunction with the blank and burst sequence, transmitting a retraining request having an extended preamble sequence from the mobile station to the second station through the first base station so as to initiate retraining of the second stations's communications receiver, the extended preamble sequence having a duration such that it ends after the blank and burst signal has ended.
Claim 17
Dependent Claim
146 words
In a cellular mobile data communications system comprising at least one base station, a mobile station having a communications receiver, means for establishing a wireless communications link between the mobile station and a first base station, a second station having a communications receiver, and means for establishing a communications link between the second station and the first base station, an apparatus comprising: means for detecting at the mobile station a blank and burst sequence associated with an order form the first base station; and means for, in conjunction with the blank and burst sequence, transmitting a retraining request having an extended preamble sequence from the mobile station to the second station through the first base station so as to initiate retraining of the second stations's communications receiver, the extended preamble sequence having a duration such that it ends after the blank and burst signal has ended.
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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) | 2000-10-27 | 2001-04-28 | 2001-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-10-27 | 2005-04-28 | 2005-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-10-27 | 2009-04-28 | 2009-10-28 | $7700.00 | Window Closed / Lapsed |