US5615409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for transmitting and receiving signals using two classes of channels
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1995-09-25
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Granted: 1997-03-25
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Expires: 2015-09-25
Abstract
Abstract A method and apparatus for transmitting and receiving signals in a base station with an antenna array in a cellular communication system. The available communication channels are divided into a plurality of classes. The base station transmits signals to the mobile station in a first class of channels in a wide antenna lobe. The position of a mobile station can then be determined from signals received at the base station from the mobile station. After the position of the mobile station has been determined, the base station can transmit signals to and receive signals from the mobile station in a second class channel with a narrow antenna lobe.
Inventors
- 👤 Ulf Forssen
- 👤 Bjorn Gudmundson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:44
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/24; H04B7/26; H04W; H04W16/00; H04W16/24; H04W16/28; H04W36/00; H04W36/0005; H04W36/0083; H04W36/0085; H04W36/08; H04W72/00; H04W72/50; H04W72/56; H04W72/563
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
178 words
A method for transmitting and receiving signals at a base station with an antenna array in a cellular communication system, comprising the steps of: dividing available communication channels into a plurality of classes; transmitting signals to a plurality of mobile stations in a first class of channels with a wide antenna lobe created by said antenna array, wherein said first class of channels is used to transmit broadcast information to an entire cell and to receive initial access signals from mobile stations, said first class of channels is also used for enabling mobile stations to measure the downlink signal strength transmitted from adjacent base stations and is used for handover access during handovers between base stations; determining position of a first mobile station from signals received from said first mobile station; transmitting signals to said first mobile station in a second class of channels with a narrow antenna lobe created by said antenna array when the position of said mobile is determined; and receiving signals from said first mobile station with adjustable lobe widths on both channel classes.
Claim 2
Independent Claim
178 words
A method for transmitting and receiving signals at a base station with an antenna array in a cellular communication system, comprising the steps of: dividing available communication channels into a plurality of classes; transmitting signals to a plurality of mobile stations in a first class of channels with a wide antenna lobe created by said antenna array, wherein said first class of channels is used to transmit broadcast information to an entire cell and to receive initial access signals from mobile stations, said first class of channels is also used for enabling mobile stations to measure the downlink signal strength transmitted from adjacent base stations and is used for handover access during handovers between base stations; determining position of a first mobile station from signals received from said first mobile station; transmitting signals to said first mobile station in a second class of channels with a narrow antenna lobe created by said antenna array when the position of said mobile is determined; and receiving signals from said first mobile station with adjustable lobe widths on both channel classes.
Claim 3
Dependent Claim
41 words
A method according to claim 1, wherein the position of said first mobile station is determined by: measuring the power level of signals received from said first mobile station; and determining a proper antenna lobe for a newly connected mobile station.
Claim 4
Dependent Claim
40 words
A method according to claim 1, wherein said base station assigns said mobile station to a channel in said second class of channels after the position of said mobile station is determined to be above a predetermined level of certainty.
Claim 5
Dependent Claim
45 words
A method according to claim 1, further comprising the steps of: transmitting and receiving signals at a mobile station on a channel in said second class of channels; and performing handover measurements of signals received at said mobile station on said first class of channels.
Claim 6
Dependent Claim
25 words
A method according to claim 1, wherein at least one control channel and a minority of traffic channels belong to the first class of channels.
Claim 7
Dependent Claim
23 words
A method according to claim 1, wherein said second class of channels has a smaller reuse distance than said first class of channels.
Claim 8
Dependent Claim
20 words
A method according to claim 1, wherein said second class of channels has more than one user for each channel.
Claim 9
Dependent Claim
17 words
A method according to claim 1, wherein said second class of channels has variable antenna lobe widths.
Claim 10
Dependent Claim
38 words
A method according to claim 8, wherein the base station gradually reduces the antenna lobe width of a second class channel assigned to a mobile station as the base station gradually determines the position of said mobile station.
Claim 11
Dependent Claim
182 words
A communication system with at least one base station having an antenna array, comprising; means for transmitting signals from a base station to a plurality of mobile stations on a plurality of classes of channels; means for receiving signals from a plurality of mobile stations at a base station on a plurality of classes of channels; means for determining a position of a mobile station from said received signals, wherein said base station transmits signals in a first class of channels with a wide antenna lobe created by said antenna array and said base station transmits signals in a second class of channels with a narrow antenna lobe created by said antenna array when the position of said mobile station has been determined, wherein said first class of channels is used to transmit broadcast information to an entire cell and to receive initial access signals from mobile stations, said first class of channels is also used for enabling mobile stations to measure the downlink signal strength transmitted from adjacent base stations and is used for handover access during handovers between base stations.
Claim 12
Dependent Claim
182 words
A communication system with at least one base station having an antenna array, comprising; means for transmitting signals from a base station to a plurality of mobile stations on a plurality of classes of channels; means for receiving signals from a plurality of mobile stations at a base station on a plurality of classes of channels; means for determining a position of a mobile station from said received signals, wherein said base station transmits signals in a first class of channels with a wide antenna lobe created by said antenna array and said base station transmits signals in a second class of channels with a narrow antenna lobe created by said antenna array when the position of said mobile station has been determined, wherein said first class of channels is used to transmit broadcast information to an entire cell and to receive initial access signals from mobile stations, said first class of channels is also used for enabling mobile stations to measure the downlink signal strength transmitted from adjacent base stations and is used for handover access during handovers between base stations.
Claim 13
Dependent Claim
21 words
A cellular communication system according to claim 10, wherein said first class of channels is used for handover between base stations.
Claim 14
Dependent Claim
43 words
A cellular communication system according to claim 11, wherein a mobile station contains means for transmitting and receiving signal on a channel in said second class of channels and means for measuring handover measurements on a channel in said first class of channels.
Claim 15
Dependent Claim
28 words
A cellular communication system according to claim 12, said mobile station further comprising means for transmitting and receiving signals on a channel in said first class of channels.
Claim 16
Dependent Claim
39 words
A cellular communication system according to claim 10, wherein said position determining means comprises: means for determining a power level of a signal from said mobile station; and means for determining an antenna lobe for a said mobile station.
Claim 17
Dependent Claim
41 words
A cellular communication system according to claim 10, wherein said base station assigns said mobile station to a channel in said second class of channels after the position of said mobile is determined to be above a predetermined level of certainty.
Claim 18
Dependent Claim
27 words
A cellular communication system according to claim 10, wherein at least one control channel and a minority of traffic channels belong to the first class of channels.
Claim 19
Dependent Claim
25 words
A cellular communication system according to claim 10, wherein said second class of channels has a smaller reuse distance than said first class of channels.
Claim 20
Dependent Claim
22 words
A cellular communication system according to claim 10, wherein said second class of channels has more than one user for each channel.
Claim 21
Dependent Claim
19 words
A cellular communication system according to claim 10, wherein said second class of channels has variable antenna lobe widths.
Claim 22
Dependent Claim
40 words
A cellular communication system according to claim 19, wherein the base station gradually reduces the antenna lobe width of a class two channel assigned to a mobile station as the base station gradually determines the position of said mobile station.
Claim 23
Dependent Claim
56 words
A communication system according to claim 10, wherein mobile stations in traffic mode can be connected to a traffic channel belonging to either the first class or the second class of channels while the mobile stations simultaneously use first class channels to extract downlink control messages and to perform signal strength measurements on adjacent base stations.
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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) | 2000-03-24 | 2000-09-23 | 2001-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-03-24 | 2004-09-23 | 2005-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-03-24 | 2008-09-23 | 2009-03-25 | $7700.00 | Window Closed / Lapsed |