US5848358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intracell handover with antenna arrays
Assignee: Telefonaktiebolaget LM Ericsson AB
•
Filing: 1996-10-31
•
Granted: 1998-12-08
•
Expires: 2016-10-31
Abstract
Abstract An intra-cell handover method in a cellular communication system which utilizes spatial information from an antenna array is disclosed. The spatial information is measured with the antenna array. A determination is then made on whether an intra-cell handover is desirable for a mobile station based upon said measured spatial information. The mobile station is then handed over from a first channel to a second channel when desirable and spatial filters in transceivers for mobile stations using the first and second channels are computed based on the spatial information.
Inventors
- 👤 Ulf Forssen
- 👤 Bjorn Gudmundsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:56
CPC Classifications
H; H04; H04W; H04W36/00; H04W36/06; H04W16/00; H04W16/24
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
90 words
An intra-cell handover method in a cellular communication system having adaptive antenna arrays, comprising the steps of: measuring spatial information inside a sector with an antenna array; determining whether an intra-cell handover is desirable for a mobile station based upon said measured spatial information; handing over said mobile station from a first channel to a second channel within the same sector when desirable; and computing spatial filters in transceivers for said mobile station and other mobile stations operating on the first and second channels based on the measured spatial information.
Claim 2
Dependent Claim
90 words
An intra-cell handover method in a cellular communication system having adaptive antenna arrays, comprising the steps of: measuring spatial information inside a sector with an antenna array; determining whether an intra-cell handover is desirable for a mobile station based upon said measured spatial information; handing over said mobile station from a first channel to a second channel within the same sector when desirable; and computing spatial filters in transceivers for said mobile station and other mobile stations operating on the first and second channels based on the measured spatial information.
Claim 3
Dependent Claim
28 words
An intra-cell handover method according to claim 1, wherein the measured spatial information is used to predict an interference situation that would result from various channel allocation decisions.
Claim 4
Dependent Claim
37 words
An intra-cell handover method according to claim 2, further comprising the steps of: measuring power level of said mobile station; and assigning said mobile station a channel based upon the measured power level and measured spatial information.
Claim 5
Dependent Claim
22 words
An intra-cell handover method according to claim 2, further comprising the step of: computing the relative uplink interference on the mobile station.
Claim 6
Dependent Claim
27 words
An intra-cell handover method according to claim 4, further comprising the step of: computing the relative uplink interference on the mobile station caused by said mobile station.
Claim 7
Dependent Claim
21 words
An intra-cell handover method according to claim 2, further comprising the step of: computing the downlink disturbance to check existing downlinks.
Claim 8
Dependent Claim
21 words
An intra-cell handover method according to claim 6, further comprising the step of: computing the downlink disturbance to check existing downlinks.
Claim 9
Dependent Claim
18 words
An intra-cell handover method according to claim 2, wherein said second channel is selected using said computed information.
Claim 10
Dependent Claim
82 words
An intra-cell handover method in a cellular communication system having adaptive antenna arrays, comprising the steps of: measuring spatial information inside a sector with an antenna array; determining whether an intra-cell handover is desirable for a mobile station based upon said measured spatial information; handing over said mobile station from a first channel to a second channel within the same sector when desirable; and computing spatial filters in transceivers for mobile stations using the first channel based on the measured spatial information.
Claim 11
Dependent Claim
82 words
An intra-cell handover method in a cellular communication system having adaptive antenna arrays, comprising the steps of: measuring spatial information inside a sector with an antenna array; determining whether an intra-cell handover is desirable for a mobile station based upon said measured spatial information; handing over said mobile station from a first channel to a second channel within the same sector when desirable; and computing spatial filters in transceivers for mobile stations using the first channel based on the measured spatial information.
Claim 12
Dependent Claim
28 words
An intra-cell handover method according to claim 9, wherein the measured spatial information is used to predict an interference situation that would result from various channel allocation decisions.
Claim 13
Dependent Claim
37 words
An intra-cell handover method according to claim 10, further comprising the steps of: measuring power level of said mobile station; and assigning said mobile station a channel based upon the measured power level and measured spatial information.
Claim 14
Dependent Claim
22 words
An intra-cell handover method according to claim 10, further comprising the step of: computing the relative uplink interference on other mobile station.
Claim 15
Dependent Claim
27 words
An intra-cell handover method according to claim 12, further comprising the step of: computing the relative uplink interference on other mobile stations caused by said mobile station.
Claim 16
Dependent Claim
21 words
An intra-cell handover method according to claim 13, further comprising the step of: computing the downlink disturbance to check existing downlinks.
Claim 17
Dependent Claim
21 words
An intra-cell handover method according to claim 10, further comprising the step of: computing the downlink disturbance to check existing downlinks.
Claim 18
Dependent Claim
18 words
An intra-cell handover method according to claim 10, wherein said second channel is selected using said computed information.
Claim 19
Dependent Claim
108 words
An intra-cell handover method in a cellular communication system having adaptive antenna arrays, comprising the steps of: determining whether an intra-cell handover is necessary; measuring the power level of a mobile station which needs to be handed off; assigning said mobile station to a channel based upon said measured power level; computing the relative uplink disturbance on the mobile station; computing the relative uplink disturbance on other mobiles from said mobile station; computing the downlink disturbance to check existing downlinks; selecting a best channel using said computed information; and modifying spatial filters of all transceivers using the selected channel and the old channel according to new disturbance situation.
Claim 20
Dependent Claim
108 words
An intra-cell handover method in a cellular communication system having adaptive antenna arrays, comprising the steps of: determining whether an intra-cell handover is necessary; measuring the power level of a mobile station which needs to be handed off; assigning said mobile station to a channel based upon said measured power level; computing the relative uplink disturbance on the mobile station; computing the relative uplink disturbance on other mobiles from said mobile station; computing the downlink disturbance to check existing downlinks; selecting a best channel using said computed information; and modifying spatial filters of all transceivers using the selected channel and the old channel according to new disturbance situation.
Claim 21
Dependent Claim
20 words
An intra-cell handover method according to claim 17, wherein said downlink disturbance is computed using measurements from said mobile station.
Claim 22
Dependent Claim
21 words
An intra-cell handover method according to claim 17, wherein scalar quality measurements are used when determining whether the handover is necessary.
Claim 23
Dependent Claim
27 words
An intra-cell handover method according to claim 17, wherein a handover is performed when two mobile stations using the same channel move too close to each other.
Claim 24
Dependent Claim
18 words
An intra-cell handover method according to claim 17, wherein said uplink disturbance is measured at a base station.
References Cited (Backward Citations)
US4128740A
Cited
US5161249A
Cited
US5239676A
Cited
US5212830A
Cited
US5303240A
Cited
US5428818A
Cited
US5379447A
Cited
WO1993012590A1
Cited
US5515378A
Cited
US5603089A
Cited
EP0616481A2
Cited
WO1995002307A1
Cited
US5615409A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-12-07 | 2002-06-08 | 2002-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-12-07 | 2006-06-08 | 2006-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-12-07 | 2010-06-08 | 2010-12-08 | $7700.00 | Window Closed / Lapsed |