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US6393003B1
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Semi-soft handoff method that uses multiple common frequency
Assignee: Samsung Electronics Co Ltd
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Filing: 1998-08-17
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Granted: 2002-05-21
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Expires: 2018-08-17
Abstract
Abstract A semi-soft handoff method, in accordance with the present invention is described. In the instance a base station makes use of multiple frequency channel, a mobile station moves inter-cell and service on a frequency that processes the present call within the destination cell to be moved to is not offered, to guarantee the call's continuance, the base station examines all adjacent cells' frequency assignment conditions and sets all cells' multiple common frequencies. Furthermore, the base station manages the traffic within a common frequency selected from the multiple common frequencies. After receiving a handoff requirement message, the base station examines for the common frequency with a minimum load. Next, the base station executes an inter-cell inter-frequency hard handoff to the corresponding common frequency and soft handoff to the destination cell by using the common frequency.
Inventors
- 👤 Kwang-Wook Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:24
CPC Classifications
H; H04; H04W; H04W36/00; H04W36/16; H04W36/18; H04W36/06; H04W36/22; H04W36/24; H04W36/30; H04W72/00; H04W72/04; H04W72/044; H04W72/0453; Y; Y02; Y02D; Y02D30/00; Y02D30/70
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
100 words
A semi-soft handoff method using multiple common frequencies wherein a base station makes use of a multiple frequency channel, said method comprising the steps of: designating frequencies among a plurality of cells, by the base station, as common frequencies; managing traffic, by the base station, within the common frequencies; receiving, by the base station, a handoff requirement message; determining, by the base station, a lowest load common frequency among the plurality of cells; executing inter-cell inter-frequency hard hand-off to the lowest load common frequency; and executing a soft handoff to the destination cell by using the lowest load common frequency.
Claim 2
Dependent Claim
100 words
A semi-soft handoff method using multiple common frequencies wherein a base station makes use of a multiple frequency channel, said method comprising the steps of: designating frequencies among a plurality of cells, by the base station, as common frequencies; managing traffic, by the base station, within the common frequencies; receiving, by the base station, a handoff requirement message; determining, by the base station, a lowest load common frequency among the plurality of cells; executing inter-cell inter-frequency hard hand-off to the lowest load common frequency; and executing a soft handoff to the destination cell by using the lowest load common frequency.
Claim 3
Dependent Claim
24 words
The semi-soft handoff method as recited in claim 1 , wherein said base station individually uses multiple common frequencies to execute inter-cell inter-frequency handoffs.
Claim 4
Dependent Claim
41 words
The semi-soft handoff method using multiple common frequency as recited in claim 1 , wherein the step of executing inter-cell inter-frequency hard hand-off includes the step of determining inter-frequency handoffs based on power of a pilot signal receiving a present service.
Claim 5
Dependent Claim
36 words
The semi-soft handoff method as recited in claim 1 , wherein said selected multiple common frequency selected by examining adjacent cells' frequency assignment conditions is a frequency associated with a lowest assignment number among the cells.
Claim 6
Dependent Claim
53 words
The semi-soft handoff method as recited in claim 1 , wherein the step of managing traffic includes the step of forcing a hard handoff to another frequency when the common frequency overloads, a call on the common frequency channel in which the overload occurred being distributed to a relatively low load frequency channel.
Claim 7
Dependent Claim
48 words
The semi-soft handoff method as recited in claim 1 , further comprises the steps of: reassigning an idle mobile station in the common frequency to a paging channel with the idle state in a noncommon frequency band; and preventing new traffic from being assigned to the common frequency.
Claim 8
Dependent Claim
36 words
The semi-soft handoff method as recited in claim 1 , further comprises the step of assigning new traffic to a noncommon traffic channel when an idle mobile station's traffic channel is formed to the common frequency.
Claim 9
Dependent Claim
35 words
The semi-soft handoff method as recited in claim 1 , wherein each multiple common frequency has a traffic load and further comprising the step of managing traffic loads to make the traffic loads substantially uniform.
Claim 10
Dependent Claim
44 words
The semi-soft handoff method as recited in claim 1 , further comprises the step of setting a new call from multiple common frequency channels, by setting the channel to the frequency channel with the lowest traffic load, each frequency channel's traffic load being managed.
Claim 11
Dependent Claim
35 words
The semi-soft handoff method as recited in claim 1 , further comprising the step of setting a new call by assigning a traffic channel to a frequency other than a corresponding mobile station's frequency band.
Claim 12
Dependent Claim
41 words
The semi-soft handoff method as recited in claim 1 , further comprising the step of setting a call to another frequency by designating a corresponding frequency to a CDMA frequency's contents based on contents of CDMA assigning messages from paging channels.
Claim 13
Independent Claim
63 words
A method of handing off calls from a mobile station between base stations comprising the steps of: designating frequencies among a plurality of cells, by at least one base station, as common frequencies; selecting, by the at least one base station, a common frequency with a lowest load among the multiple common frequencies; and handing off a call using the selected common frequency.
Claim 14
Independent Claim
63 words
A method of handing off calls from a mobile station between base stations comprising the steps of: designating frequencies among a plurality of cells, by at least one base station, as common frequencies; selecting, by the at least one base station, a common frequency with a lowest load among the multiple common frequencies; and handing off a call using the selected common frequency.
Claim 15
Dependent Claim
37 words
The method of handing off calls as recited in claim 12 , wherein the step of designating frequencies includes the step of determining inter-cell inter-frequency handoffs based on power of a pilot signal receiving a present service.
Claim 16
Dependent Claim
37 words
The method of handing off calls as recited in claim 12 , wherein each multiple common frequency has a traffic load and further comprising the step of managing traffic loads to make the traffic loads substantially uniform.
Claim 17
Dependent Claim
51 words
The method of handing off calls as recited in claim 12 , further comprising the steps of forcing a hard handoff to another frequency when the selected common frequency overloads, a call on the common frequency channel in which the overload occurred being distributed to a relatively low load frequency channel.
Claim 18
Dependent Claim
51 words
The method of handing off calls as recited in claim 12 , further comprises the steps of: reassigning an idle mobile station in the selected common frequency to a paging channel with the idle state in a noncommon frequency band; and preventing new traffic from being assigned to the common frequencies.
Claim 19
Dependent Claim
38 words
The method of handing off calls as recited in claim 12 , further comprises the step of assigning new traffic to a noncommon traffic channel when an idle mobile station's traffic channel is formed to the common frequencies.
Claim 20
Dependent Claim
41 words
The method of handing off calls as recited in claim 12 , wherein the step of handing off a call using the selected common frequency includes the step of executing an intra-cell inter-frequency hard hand-off to a lowest load common frequency.
Claim 21
Dependent Claim
44 words
The method of handing off calls as recited in claim 12 , wherein the step of handing off a call using the selected common frequency includes the step of executing a soft handoff to a destination cell by using a lowest load common frequency.
Claim 22
Independent Claim
76 words
A system for handing off calls from a mobile station between base station comprising: means for setting cells to a common frequency selected from multiple predetermined common frequencies designated by at least one base station; means for selecting, by the at least one base station, the common frequency for the cells based on a frequency channel having the lowest use; and means for handing off a call between the base stations on the selected common frequency.
Claim 23
Independent Claim
76 words
A system for handing off calls from a mobile station between base station comprising: means for setting cells to a common frequency selected from multiple predetermined common frequencies designated by at least one base station; means for selecting, by the at least one base station, the common frequency for the cells based on a frequency channel having the lowest use; and means for handing off a call between the base stations on the selected common frequency.
Claim 24
Dependent Claim
37 words
The system as recited in claim 20 , wherein the means for handing off further comprises a noncommon traffic channel for reassigning traffic when an idle mobile station's traffic channel is formed to the selected common frequency.
Claim 25
Dependent Claim
32 words
The system as recited in claim 20 , wherein the means for handing off further comprises an inter-cell inter-frequency hard hand-off means for executing a handoff to a lowest load common frequency.
Claim 26
Dependent Claim
35 words
The system as recited in claim 20 , wherein the means for handing off further comprises a soft handoff means for executing a handoff to a destination cell by using a lowest load common frequency.
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| 3.5 Years (Year 4) | 2005-05-20 | 2005-11-19 | 2006-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-05-20 | 2009-11-19 | 2010-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-05-20 | 2013-11-19 | 2014-05-21 | $7700.00 | Window Closed / Lapsed |