US5701585A
Expired / Lapsed
US
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Mobile assisted handoff
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1994-12-12
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Granted: 1997-12-23
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Expires: 2014-12-12
Abstract
Abstract Several mobile assisted handoff methods for use in the cellular communication system comprising a plurality of cells are disclosed. First, the quality level of a cell a mobile station is presently using is measured to determine whether the quality level is above or below a threshold. If the quality level is below the threshold, a primary list of cells is assigned to the mobile station, whereas if the quality level is above the threshold, a secondary list of cells is assigned to the mobile station. The quality level of each of the assigned cells is then measured by the mobile station and reported to the communication system.
Inventors
- 👤 Harald Kallin
- 👤 Anna Fallgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:00
CPC Classifications
H; H04; H04W; H04W36/00; H04W36/24; H04W36/30; H04W36/302; H04W16/00; H04W16/24; H04W16/32; H04W36/04
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
136 words
A method of mobile assisted handoff in a cellular communication system comprising a plurality of mobile stations and a land system and a plurality of cells, comprising the steps of: assigning a mobile station a list of cells to measure, wherein said list is divided into two sections, a steady section and an alternating section; measuring quality level of each assigned cell; reporting said quality levels to said land system; transferring a cell from the alternating section of the list to the steady section of the list when said cell has a quality level higher than one of the cells in the steady section, wherein the cell with the lowest quality level in the steady section is transferred to said alternating section; and changing said cells listed in said alternating section every predetermined period of time.
Claim 2
Independent Claim
136 words
A method of mobile assisted handoff in a cellular communication system comprising a plurality of mobile stations and a land system and a plurality of cells, comprising the steps of: assigning a mobile station a list of cells to measure, wherein said list is divided into two sections, a steady section and an alternating section; measuring quality level of each assigned cell; reporting said quality levels to said land system; transferring a cell from the alternating section of the list to the steady section of the list when said cell has a quality level higher than one of the cells in the steady section, wherein the cell with the lowest quality level in the steady section is transferred to said alternating section; and changing said cells listed in said alternating section every predetermined period of time.
Claim 3
Dependent Claim
18 words
A mobile assisted handoff method according to claim 1, wherein said quality level is determined by signal strength.
Claim 4
Dependent Claim
20 words
A mobile assisted handoff method according to claim 1, wherein said quality level is determined by a bit error rate.
Claim 5
Dependent Claim
19 words
A mobile assisted handoff method according to claim 1, wherein said quality level is determined by a carrier/interference ratio.
Claim 6
Dependent Claim
20 words
A mobile assisted handoff method according to claim 1, wherein said quality levels are adjusted according to precalculated compensation levels.
Claim 7
Independent Claim
138 words
A method of mobile assisted handoff in a cellular communication system comprising a plurality of mobile stations and a land system and a plurality of cells, comprising the steps of: assigning a mobile station a list of cells to measure, wherein said list is divided into two sections, a steady section and an alternating section; measuring quality level of each assigned cell; reporting said quality levels to said land system; transferring a cell from the alternating section of the list to the steady section of the list when said cell has an adjusted quality level higher than one of the cells in the steady section, wherein the cell with the lowest adjusted quality level in the steady section is transferred to said alternating section; and changing said cells listed in said alternating section every predetermined period of time.
Claim 8
Independent Claim
138 words
A method of mobile assisted handoff in a cellular communication system comprising a plurality of mobile stations and a land system and a plurality of cells, comprising the steps of: assigning a mobile station a list of cells to measure, wherein said list is divided into two sections, a steady section and an alternating section; measuring quality level of each assigned cell; reporting said quality levels to said land system; transferring a cell from the alternating section of the list to the steady section of the list when said cell has an adjusted quality level higher than one of the cells in the steady section, wherein the cell with the lowest adjusted quality level in the steady section is transferred to said alternating section; and changing said cells listed in said alternating section every predetermined period of time.
Claim 9
Dependent Claim
18 words
A mobile assisted handoff method according to claim 6, wherein said quality level is determined by signal strength.
Claim 10
Dependent Claim
20 words
A mobile assisted handoff method according to claim 6, wherein said quality level is determined by a bit error rate.
Claim 11
Dependent Claim
19 words
A mobile assisted handoff method according to claim 6, wherein said quality level is determined by a carrier/interference ratio.
Claim 12
Dependent Claim
20 words
A mobile assisted handoff method according to claim 6, wherein said quality levels are adjusted according to precalculated compensation levels.
Claim 13
Independent Claim
148 words
A method of mobile assisted handoff in a cellular communication system comprising a plurality of mobile stations and a land system and a plurality of cells, comprising the steps of: assigning a mobile station a list of cells to measure, wherein said list is divided into three sections, a fixed section, a steady section, and an alternating section, said fixed section containing cells which are always measured; measuring quality level of each assigned cell; reporting said quality levels to said land system; transferring a cell from the alternating section of the list to the steady section of the list when said cell has a quality level higher than one of the cells in the steady section, wherein the cell with the lowest quality level in the steady section is transferred to said alternating section; and changing said cells listed in said alternating section every predetermined period of time.
Claim 14
Independent Claim
148 words
A method of mobile assisted handoff in a cellular communication system comprising a plurality of mobile stations and a land system and a plurality of cells, comprising the steps of: assigning a mobile station a list of cells to measure, wherein said list is divided into three sections, a fixed section, a steady section, and an alternating section, said fixed section containing cells which are always measured; measuring quality level of each assigned cell; reporting said quality levels to said land system; transferring a cell from the alternating section of the list to the steady section of the list when said cell has a quality level higher than one of the cells in the steady section, wherein the cell with the lowest quality level in the steady section is transferred to said alternating section; and changing said cells listed in said alternating section every predetermined period of time.
Claim 15
Dependent Claim
18 words
A mobile assisted handoff method according to claim 11, wherein said quality level is determined by signal strength.
Claim 16
Dependent Claim
20 words
A mobile assisted handoff method according to claim 11, wherein said quality level is determined by a bit error rate.
Claim 17
Dependent Claim
19 words
A mobile assisted handoff method according to claim 11, wherein said quality level is determined by a carrier/interference ratio.
Claim 18
Dependent Claim
20 words
A mobile assisted handoff method according to claim 11, wherein said quality levels are adjusted according to precalculated compensation levels.
Claim 19
Independent Claim
150 words
A method of mobile assisted handoff in a cellular communication system comprising a plurality of mobile stations and a land system and a plurality of cells, comprising the steps of: assigning a mobile station a list of cells to measure, wherein said list is divided into three sections, a fixed section, a steady section, and an alternating section, said fixed section containing cells which are always measured; measuring quality level of each assigned cell; reporting said quality levels to said land system; transferring a cell from the alternating section of the list to the steady section of the list when said cell has an adjusted quality level higher than one of the cells in the steady section, wherein the cell with the lowest adjusted quality level in the steady section is transferred to said alternating section; and changing said cells listed in said alternating section every predetermined period of time.
Claim 20
Independent Claim
150 words
A method of mobile assisted handoff in a cellular communication system comprising a plurality of mobile stations and a land system and a plurality of cells, comprising the steps of: assigning a mobile station a list of cells to measure, wherein said list is divided into three sections, a fixed section, a steady section, and an alternating section, said fixed section containing cells which are always measured; measuring quality level of each assigned cell; reporting said quality levels to said land system; transferring a cell from the alternating section of the list to the steady section of the list when said cell has an adjusted quality level higher than one of the cells in the steady section, wherein the cell with the lowest adjusted quality level in the steady section is transferred to said alternating section; and changing said cells listed in said alternating section every predetermined period of time.
Claim 21
Dependent Claim
18 words
A mobile assisted handoff method according to claim 16, wherein said quality level is determined by signal strength.
Claim 22
Dependent Claim
20 words
A mobile assisted handoff method according to claim 16, wherein said quality level is determined by a bit error rate.
Claim 23
Dependent Claim
19 words
A mobile assisted handoff method according to claim 16, wherein said quality level is determined by a carrier/interference ratio.
Claim 24
Dependent Claim
20 words
A mobile assisted handoff method according to claim 16, wherein said quality levels are adjusted according to precalculated compensation levels.
Claim 25
Dependent Claim
139 words
A communications system with mobile assisted handoff comprising a plurality of mobile stations and a land system and a plurality of cells, comprising: means for assigning a mobile station a list of cells to measure, wherein said list is divided into two sections, a steady section and an alternating section; means for measuring quality level of each assigned cell; means for reporting the quality levels to said land system; means for transferring a cell from the alternating section of the list to the steady section of the list when said cell has a quality level higher than one of the cells in the steady section, wherein the cell with the lowest quality level in the steady section is transferred to said alternating section; and means for changing said cells listed in said alternating section every predetermined period of time.
Claim 26
Dependent Claim
139 words
A communications system with mobile assisted handoff comprising a plurality of mobile stations and a land system and a plurality of cells, comprising: means for assigning a mobile station a list of cells to measure, wherein said list is divided into two sections, a steady section and an alternating section; means for measuring quality level of each assigned cell; means for reporting the quality levels to said land system; means for transferring a cell from the alternating section of the list to the steady section of the list when said cell has a quality level higher than one of the cells in the steady section, wherein the cell with the lowest quality level in the steady section is transferred to said alternating section; and means for changing said cells listed in said alternating section every predetermined period of time.
Claim 27
Dependent Claim
16 words
A communications system according to claim 21, wherein said quality level is determined by signal strength.
Claim 28
Dependent Claim
18 words
A communications system according to claim 21, wherein said quality level is determined by a bit error rate.
Claim 29
Dependent Claim
17 words
A communications system according to claim 21, wherein said quality level is determined by a carrier/interface ratio.
Claim 30
Dependent Claim
18 words
A communications system according to claim 21, wherein said quality levels are adjusted according to precalculated compensation levels.
References Cited (Backward Citations)
US4144496A
Cited
US4435840A
Cited
EP0126557A1
Cited
US4608711A
Cited
US4670899A
Cited
US4754453A
Cited
US4799252A
Cited
US4765753A
Cited
US4850033A
Cited
US4955082A
Cited
US5042082A
Cited
JPH03196722A
Cited
US5101501A
Cited
US5083304A
Cited
US5517675A
Cited
US5450473A
Cited
US5432843A
Cited
US5428816A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-12-22 | 2001-06-23 | 2001-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-12-22 | 2005-06-23 | 2005-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-12-22 | 2009-06-23 | 2009-12-23 | $7700.00 | Window Closed / Lapsed |