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US5790528A
Expired / Lapsed
US
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Semi-hard handoff in a cellular telecommunications systems
Assignee: Nokia Solutions and Networks Oy
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Filing: 1994-01-27
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Granted: 1998-08-04
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Expires: 2014-01-27
Abstract
Abstract In a CDMA cellular telecommunications system, comprising mobile exchanges (MSC), base stations (BS) and mobile stations (MS), a new CDMA handoff procedure, a semi-hard handoff, is employed. Semi-hard handoff takes place within one and the same border base station (BS12), located in the boundary of two service areas (SA1, SA2) which are controlled by neighbouring mobile exchanges (MSC1, MSC2). This border base station is connected to and can be accessed from both of these neighbouring mobile exchanges. The inventive semi-hard handoff is a network based handoff of the communication control functions from the first to the second neighbouring mobile exchange without interrupting the active CDMA radio communications between the border base station (BS12) and the mobile station (MS).
Inventors
- 👤 Peter Muszynski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:22
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/24; H04B7/26; H04B7/2628; H04W; H04W36/00; H04W36/16; H04W36/18
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
230 words
A cellular telecommunications system comprising a plurality of mobile stations (MS20), a first mobile exchange (MSC1), a second mobile exchange (MSC2), a plurality of base stations, a first group (BS10) of said plurality of base stations being connected solely to said first mobile exchange (MSC1), a second group (BS14) of said plurality of base stations being connected solely to said second mobile exchange (MSC2), and at least one of said plurality of base stations being a border base station (BS12) connected to both said first mobile exchange and said second mobile exchange, means at said first mobile exchange for requesting a semi-hard handoff from said second mobile exchange, means at said second mobile exchange for allocating control and diversity combining resources required by said second mobile exchange for processing and controlling user communications, means at said at least one border base station for switching over user communications signals from said first mobile exchange towards said second mobile exchange, means at said second mobile exchange for taking control of user communications by means of said allocated resources, means at said second mobile exchange for informing an associated one of said plurality of mobile stations about the semi-hard handoff, means at said second mobile exchange for acknowledging the successful completion of the semi-hard handoff to said first mobile exchange, means at said first mobile exchange for releasing resources involved with user communications.
Claim 2
Dependent Claim
230 words
A cellular telecommunications system comprising a plurality of mobile stations (MS20), a first mobile exchange (MSC1), a second mobile exchange (MSC2), a plurality of base stations, a first group (BS10) of said plurality of base stations being connected solely to said first mobile exchange (MSC1), a second group (BS14) of said plurality of base stations being connected solely to said second mobile exchange (MSC2), and at least one of said plurality of base stations being a border base station (BS12) connected to both said first mobile exchange and said second mobile exchange, means at said first mobile exchange for requesting a semi-hard handoff from said second mobile exchange, means at said second mobile exchange for allocating control and diversity combining resources required by said second mobile exchange for processing and controlling user communications, means at said at least one border base station for switching over user communications signals from said first mobile exchange towards said second mobile exchange, means at said second mobile exchange for taking control of user communications by means of said allocated resources, means at said second mobile exchange for informing an associated one of said plurality of mobile stations about the semi-hard handoff, means at said second mobile exchange for acknowledging the successful completion of the semi-hard handoff to said first mobile exchange, means at said first mobile exchange for releasing resources involved with user communications.
Claim 3
Dependent Claim
12 words
System according to claim 1, wherein the system is a CDMA system.
Claim 4
Dependent Claim
12 words
System according to claim 1, wherein the system is a TDMA system.
Claim 5
Dependent Claim
261 words
In a cellular telecommunications system comprising a plurality of mobile stations, a first mobile exchange, a second mobile exchange, a plurality of base stations, a first group of said plurality of base stations being connected solely to said first mobile exchange, a second group of said plurality of base stations being connected solely to said second mobile exchange, and at least one of said plurality of base stations being a border base station connected to both said first mobile exchange and said second mobile exchange, the method of semi-hard handoff for handing off the control and signal diversity combining functions involved with ongoing user communications from said first mobile exchange to said second mobile exchange without disrupting the radio communications between an associated one of said plurality of mobile stations and said at least one border base station, the semi-hard handoff comprising the steps of requesting a semi-hard handoff from said second mobile exchange by said first mobile exchange, allocating control and diversity combining resources required by said second mobile exchange for processing and controlling said ongoing user communications, switching over said ongoing user communications signals from said first mobile exchange towards said second mobile exchange at said at least one border base station, taking control of said ongoing user communications by said second mobile exchange by means of said allocated resources, informing said associated one of said plurality of mobile stations about the semi-hard handoff, acknowledging the successful completion of semi-hard handoff to said first mobile exchange, releasing resources involved with said ongoing user communications at said first mobile exchange.
Claim 6
Dependent Claim
261 words
In a cellular telecommunications system comprising a plurality of mobile stations, a first mobile exchange, a second mobile exchange, a plurality of base stations, a first group of said plurality of base stations being connected solely to said first mobile exchange, a second group of said plurality of base stations being connected solely to said second mobile exchange, and at least one of said plurality of base stations being a border base station connected to both said first mobile exchange and said second mobile exchange, the method of semi-hard handoff for handing off the control and signal diversity combining functions involved with ongoing user communications from said first mobile exchange to said second mobile exchange without disrupting the radio communications between an associated one of said plurality of mobile stations and said at least one border base station, the semi-hard handoff comprising the steps of requesting a semi-hard handoff from said second mobile exchange by said first mobile exchange, allocating control and diversity combining resources required by said second mobile exchange for processing and controlling said ongoing user communications, switching over said ongoing user communications signals from said first mobile exchange towards said second mobile exchange at said at least one border base station, taking control of said ongoing user communications by said second mobile exchange by means of said allocated resources, informing said associated one of said plurality of mobile stations about the semi-hard handoff, acknowledging the successful completion of semi-hard handoff to said first mobile exchange, releasing resources involved with said ongoing user communications at said first mobile exchange.
Claim 7
Dependent Claim
15 words
Method according to claim 4, wherein the semi-hard handoff is utilized in a CDMA system.
Claim 8
Dependent Claim
15 words
Method according to claim 4, wherein the semi-hard handoff is utilized in a TDMA system.
References Cited (Backward Citations)
EP0421535A1
Cited
EP0577960A1
Cited
US5504935A
Cited
WO1995008897A1
Cited
WO1995008898A1
Cited
WO1995020865A1
Cited
US5697055A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-08-03 | 2002-02-02 | 2002-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-08-03 | 2006-02-02 | 2006-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-08-03 | 2010-02-02 | 2010-08-04 | $7700.00 | Window Closed / Lapsed |