Patent US5963848A successfully refreshed from Google Patents.
US5963848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for assigning a channel to a mobile unit in a wireless communication system
Assignee: Google Technology Holdings LLC
•
Filing: 1996-04-24
•
Granted: 1999-10-05
•
Expires: 2016-04-24
Abstract
Abstract A unique method and apparatus determines (310) which channels in a wireless communication system are both authorized for cordless operation and available. A channel is then selectively chosen (328) from this list to reduce the probability that an interferer will be on the chosen channel. For example, the channel could be randomly selected from all available channels or randomly selected from a limited group of available channels to avoid co-channel interference. Alternatively, the channel could be chosen based upon the level of the signal that last caused that channel to be blocked. Finally, the channel could be chosen based upon the number of channels from an available channel to the nearest blocked channel.
Inventors
- 👤 Robert Faust D'Avello
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:58
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/72; H04M1/725; H04M1/72502; H04M1/72505; H04M1/72511; H04W; H04W72/00; H04W72/50; H04W72/54; H04W72/541
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
110 words
A method for assigning a channel to a mobile unit operating in a wireless communication system comprising the steps of: periodically scanning a predetermined set of channels; establishing a list of available channels of said predetermined set of channels; providing a weighted value which is a multiple of the time a channel is free from interference raised to an exponential value to each said available channel of said predetermined set of channels; monitoring a current channel of said predetermined set of channels; detecting interference on said current channel; and selectively choosing a new channel from said list of available channels to reduce the probability of interference on said new channel.
Claim 2
Independent Claim
110 words
A method for assigning a channel to a mobile unit operating in a wireless communication system comprising the steps of: periodically scanning a predetermined set of channels; establishing a list of available channels of said predetermined set of channels; providing a weighted value which is a multiple of the time a channel is free from interference raised to an exponential value to each said available channel of said predetermined set of channels; monitoring a current channel of said predetermined set of channels; detecting interference on said current channel; and selectively choosing a new channel from said list of available channels to reduce the probability of interference on said new channel.
Claim 3
Dependent Claim
32 words
The method for assigning a channel of claim 1 further including a step of establishing a maximum threshold, wherein a radio frequency level of said available channels is below said maximum threshold.
Claim 4
Dependent Claim
23 words
The method for assigning a channel of claim 1 wherein said step of selectively choosing a new channel comprises randomly selecting a channel.
Claim 5
Dependent Claim
34 words
The method for assigning a channel of claim 1 wherein said step of selectively choosing a new channel comprises choosing a channel based upon how long an available channel has been free from interference.
Claim 6
Dependent Claim
36 words
The method for assigning a channel of claim 1 wherein said step of selectively choosing a new channel comprises choosing a channel based upon the level of a signal that caused interference on an available channel.
Claim 7
Dependent Claim
38 words
The method for assigning a channel of claim 1 wherein said step of selectively choosing a new channel comprises choosing a channel based upon the number of channels from an available channel to the nearest channel having interference.
Claim 8
Dependent Claim
27 words
The method for assigning a channel of claim 1 wherein said step of selectively choosing a new channel comprises selecting a channel based upon said weighted value.
Claim 9
Dependent Claim
77 words
The method for assigning a channel of claim 1 wherein said step of selectively choosing a new channel comprises determining channel quality for each said available channel based upon a combination of two or more of the following criteria: determining how long a channel has been free from interference; determining a level of the interfering signal on each said available channel; and determining a number of channels from each said available channel to a nearest blocked channel.
Claim 10
Dependent Claim
30 words
The method for assigning a channel of claim 1 further including a step of establishing a period of time to make a channel of said predetermined set of channels unavailable.
Claim 11
Dependent Claim
40 words
The method for assigning a channel of claim 9 wherein said step of establishing a period of time comprises summing a minimum value plus an offset value based upon the level of a signal which caused interference on the channel.
Claim 12
Independent Claim
133 words
A method for assigning a channel to a mobile unit operating in a wireless communication system comprising the steps of: periodically scanning a predetermined set of channels; establishing a list of available channels of said predetermined set of channels wherein said step of establishing a period of time comprises summing a minimum value plus an offset value based upon the level of the signal which caused interference on the channel, wherein said offset value proportional to the difference between the level of the signal which caused the interference on the channel and a minimum value; monitoring a current channel of said predetermined set of channels; detecting interference on said current channel; and selectively choosing a new channel from said list of available channels to reduce the probability of interference on said new channel.
Claim 13
Independent Claim
133 words
A method for assigning a channel to a mobile unit operating in a wireless communication system comprising the steps of: periodically scanning a predetermined set of channels; establishing a list of available channels of said predetermined set of channels wherein said step of establishing a period of time comprises summing a minimum value plus an offset value based upon the level of the signal which caused interference on the channel, wherein said offset value proportional to the difference between the level of the signal which caused the interference on the channel and a minimum value; monitoring a current channel of said predetermined set of channels; detecting interference on said current channel; and selectively choosing a new channel from said list of available channels to reduce the probability of interference on said new channel.
Claim 14
Independent Claim
151 words
A method for assigning channels in a wireless communication system having a mobile unit and a base station, said mobile unit adapted to operate in cordless telephone mode on a predetermined set of channels when within range of said base station, and a cellular mode, said method comprising the steps of: periodically scanning said predetermined set of channels; establishing a list of available channels of said predetermined set of channels wherein a radio frequency interference level of said available channels is below a maximum threshold; monitoring a current channel of said predetermined set of channels; detecting interference on said current channel; randomly choosing a new channel from said list of available channels to reduce the probability of interference on said new channel; and providing a weighted value which is a multiple of the time a channel is free from interference to each said available channel of said predetermined set of channels.
Claim 15
Independent Claim
151 words
A method for assigning channels in a wireless communication system having a mobile unit and a base station, said mobile unit adapted to operate in cordless telephone mode on a predetermined set of channels when within range of said base station, and a cellular mode, said method comprising the steps of: periodically scanning said predetermined set of channels; establishing a list of available channels of said predetermined set of channels wherein a radio frequency interference level of said available channels is below a maximum threshold; monitoring a current channel of said predetermined set of channels; detecting interference on said current channel; randomly choosing a new channel from said list of available channels to reduce the probability of interference on said new channel; and providing a weighted value which is a multiple of the time a channel is free from interference to each said available channel of said predetermined set of channels.
Claim 16
Dependent Claim
40 words
The method for assigning channels of claim 12 wherein said step of providing a weighted average comprises providing a weighted value which is a multiple of the time an available channel is free from interference raised to an exponential value.
References Cited (Backward Citations)
US4694485A
Cited
US4639550A
Cited
US4650928A
Cited
US4792984A
Cited
US4783844A
Cited
US4837801A
Cited
US4768219A
Cited
US5093924A
Cited
US5044010A
Cited
US5197093A
Cited
US5418839A
Cited
US5345597A
Cited
US5260988A
Cited
US5203012A
Cited
US5295138A
Cited
US5491837A
Cited
US5488649A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-10-04 | 2003-04-05 | 2003-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-10-04 | 2007-04-05 | 2007-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-10-04 | 2011-04-05 | 2011-10-05 | $7700.00 | Window Closed / Lapsed |