Patent US6490262B1 successfully refreshed from Google Patents.
US6490262B1
Expired / Lapsed
US
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Interference in a cellular communications system
Assignee: Motorola Solutions Inc
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Filing: 1999-11-17
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Granted: 2002-12-03
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Expires: 2019-11-17
Abstract
Abstract A method of, and apparatus for, processing interference in a cellular communications system. The method includes the steps of determining a quality value per burst; identifying those bursts for which the quality value is below a predetermined threshold; determining a pattern of the identified bursts in terms of transmission frequency and time; calculating respective predicted patterns based on respective hopping determination parameters of other cells and of the given cell; comparing the determined pattern of the identified bursts with the predicted patterns; and responsive thereto predicting the hopping determination parameters of whichever interfering cell produced the determined pattern of the identified bursts by interfering with the given cell. Further possibilities include comparing the given cell with the interfering cell and identifying predicted interfering timeslots. Further interference can be reduced by not transmitting bursts during some or all of the predicted interfering timeslots. Interference produced by overlapping parts of bursts of unsynchronised timeslots can be incorporated.
Inventors
- 👤 Robin George Hogger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:50
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/69; H04B1/713; H04B1/715; H04B2001/7154
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
153 words
A method of processing interference in a cellular communications system, in which system transmission and reception is carried out using TDMA channels in which a burst of one or more bits is transmitted per timeslot; the method comprising the steps of: carrying out frequency hopping on the TDMA channels of the system; for a given channel in a given cell of the communications system, determining a quality value per burst; identifying those bursts for which the quality value is below a predetermined threshold; determining a pattern of the identified bursts in terms of transmission frequency and time; calculating respective predicted patterns based on respective hopping determination parameters of other cells and of the given cell; comparing the determined pattern of the identified bursts with the predicted patterns; and responsive thereto predicting the hopping determination parameters of whichever interfering cell produced the determined pattern of the identified bursts by interfering with the given cell.
Claim 2
Independent Claim
153 words
A method of processing interference in a cellular communications system, in which system transmission and reception is carried out using TDMA channels in which a burst of one or more bits is transmitted per timeslot; the method comprising the steps of: carrying out frequency hopping on the TDMA channels of the system; for a given channel in a given cell of the communications system, determining a quality value per burst; identifying those bursts for which the quality value is below a predetermined threshold; determining a pattern of the identified bursts in terms of transmission frequency and time; calculating respective predicted patterns based on respective hopping determination parameters of other cells and of the given cell; comparing the determined pattern of the identified bursts with the predicted patterns; and responsive thereto predicting the hopping determination parameters of whichever interfering cell produced the determined pattern of the identified bursts by interfering with the given cell.
Claim 3
Dependent Claim
67 words
A method according to claim 1 , further comprising the steps of: comparing the hopping determination parameters of the given cell with the hopping determination parameters of the interfering cell; and identifying for which timeslots of the given channel the frequency of the interfering channel of the interfering cell and the frequency of the given channel of the given cell will coincide thus constituting predicted interfering timeslots.
Claim 4
Dependent Claim
36 words
A method according to claim 2 , further comprising the step of reducing further interference by not transmitting bursts from the given cell on the given channel during some or all of the predicted interfering timeslots.
Claim 5
Dependent Claim
36 words
A method according to claim 2 , further comprising the step of reducing further interference by not transmitting bursts from the interfering cell on its interfering channel during some or all of the predicted interfering timeslots.
Claim 6
Dependent Claim
42 words
A method according to claim 3 , further comprising the steps of: assessing the probability of frame erasure should too many timeslots have no transmitted burst in them; and responsive thereto determining in which of the predicted interfering timeslots to transmit bursts.
Claim 7
Dependent Claim
46 words
A method according to claim 3 , further comprising the steps of monitoring received bursts on the given channel of the given cell during the identified timeslots and/or predicted interfering timeslots; and responsive thereto determining when the interfering channel of the interfering cell has ceased transmission.
Claim 8
Dependent Claim
31 words
A method according to claim 1 , further comprising the step of assessing quality values of parts of bursts, thereby incorporating interference produced by overlapping parts of bursts of unsynchronised timeslots.
Claim 9
Independent Claim
164 words
An apparatus for processing interference in a cellular communications system, in which system transmission and reception is carried out using TDMA channels in which a burst of one or more bits is transmitted per timeslot; the apparatus comprising: means for carrying out frequency hopping on the TDMA channels of the system; means for determining, for a given channel in a given cell of the communications system, a quality value per burst; means for identifying those bursts for which the quality value is below a predetermined threshold; means for determining a pattern of the identified bursts in terms of transmission frequency and time; means for calculating respective predicted patterns based on respective hopping determination parameters of other cells and of the given cell; means for comparing the determined pattern of the identified bursts with the predicted patterns; and means for responsive thereto predicting the hopping determination parameters of whichever interfering cell produced the determined pattern of the identified bursts by interfering with the given cell.
Claim 10
Independent Claim
164 words
An apparatus for processing interference in a cellular communications system, in which system transmission and reception is carried out using TDMA channels in which a burst of one or more bits is transmitted per timeslot; the apparatus comprising: means for carrying out frequency hopping on the TDMA channels of the system; means for determining, for a given channel in a given cell of the communications system, a quality value per burst; means for identifying those bursts for which the quality value is below a predetermined threshold; means for determining a pattern of the identified bursts in terms of transmission frequency and time; means for calculating respective predicted patterns based on respective hopping determination parameters of other cells and of the given cell; means for comparing the determined pattern of the identified bursts with the predicted patterns; and means for responsive thereto predicting the hopping determination parameters of whichever interfering cell produced the determined pattern of the identified bursts by interfering with the given cell.
Claim 11
Dependent Claim
68 words
An apparatus according to claim 8 , further comprising: means for comparing the hopping determination parameters of the given cell with the hopping determination parameters of the interfering cell; and means for identifying for which timeslots of the given channel the frequency of the interfering channel of the interfering cell and the frequency of the given channel of the given cell will coincide thus constituting predicted interfering timeslots.
Claim 12
Dependent Claim
35 words
An apparatus according to claim 9 , further comprising means for reducing further interference by not transmitting bursts from the given cell on the given channel during some or all of the predicted interfering timeslots.
Claim 13
Dependent Claim
35 words
An apparatus according to claim 9 , further comprising means for reducing further interference by not transmitting bursts from the interfering cell on its interfering channel during some or all of the predicted interfering timeslots.
Claim 14
Dependent Claim
43 words
An apparatus according to claim 10 , further comprising: means for assessing the probability of frame erasure should too many timeslots have no transmitted burst in them; and means for responsive thereto determining in which of the predicted interfering timeslots to transmit bursts.
Claim 15
Dependent Claim
47 words
An apparatus according to claim 10 , further comprising: means for monitoring received bursts on the given channel of the given cell during the identified timeslots and/or predicted interfering timeslots; and means for responsive thereto determining when the interfering channel of the interfering cell has ceased transmission.
Claim 16
Dependent Claim
30 words
An apparatus according to claim 8 , further comprising means for assessing quality values of parts of bursts, thereby incorporating interference produced by overlapping parts of bursts of unsynchronised timeslots.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2005-12-02 | 2006-06-03 | 2006-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-12-02 | 2010-06-03 | 2010-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-12-02 | 2014-06-03 | 2014-12-03 | $7700.00 | Window Closed / Lapsed |