US5539744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hand-off management for cellular telephony
Assignee: AT&T Inc
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Filing: 1995-02-28
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Granted: 1996-07-23
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Expires: 2015-02-28
Abstract
Abstract A telecommunications architecture using ATM based technology is disclosed that supports wireless communications. Some embodiments of the present invention may provide a mechanism for hand-off, which has fewer costs and restrictions than other hand-off schemes the in the prior art. In one embodiment a plurality of virtual circuit identifiers is created such that each is unambiquously associated with the others. The virtual circuit identifiers are then transmitted to a wireless terminal, via a first radio port. Subsequently, the wireless terminal transmits one of the virtual circuit identifiers to second radio port.
Inventors
- 👤 Helen Chu
- 👤 Bharat T. Doshi
- 👤 Subrahmanyam Dravida
- 👤 Sanjiv Nanda
- 👤 Anil S. Sawkar
- 👤 Kazem A. Sohraby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:24
CPC Classifications
H; H04; H04L; H04L49/00; H04L49/30; H04L49/3081; H04Q; H04Q11/00; H04Q11/04; H04Q11/0428; H04Q11/0478; H04W; H04W76/00; H04W76/20; H04L12/00; H04L12/54; H04L12/56; H04L12/5601; H04L2012/5603; H04L2012/5604; H04L2012/5605; H04L2012/5606; H04L2012/5607; H04L2012/5625; H04L2012/5626; H04L2012/5629; H04L2012/563; H04W36/00; H04W36/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
48 words
A method, comprising: creating a plurality of virtual circuit identifiers, each of which is associated with the others; transmitting said virtual circuit identifiers to a wireless terminal via a first radio port; receiving one of said virtual circuit identifiers from said wireless terminal via a second radio port.
Claim 2
Independent Claim
48 words
A method, comprising: creating a plurality of virtual circuit identifiers, each of which is associated with the others; transmitting said virtual circuit identifiers to a wireless terminal via a first radio port; receiving one of said virtual circuit identifiers from said wireless terminal via a second radio port.
Claim 3
Dependent Claim
44 words
The method of claim 1 further comprising communicating concurrently with said wireless terminal via said first radio port and with the assistance of one of said virtual circuit identifiers and via said second radio port and a different one of said virtual circuit identifiers.
Claim 4
Independent Claim
74 words
A method comprising: creating at least a first virtual circuit identifier and a second virtual circuit identifier; associating said first and second virtual circuit identifiers with each other; transmitting said first and second virtual circuit identifiers to a wireless terminal via a first radio port as part of a telecommunications call; receiving one of said first and second virtual circuit identifiers from said wireless terminal via a second radio port during said telecommunications call.
Claim 5
Independent Claim
74 words
A method comprising: creating at least a first virtual circuit identifier and a second virtual circuit identifier; associating said first and second virtual circuit identifiers with each other; transmitting said first and second virtual circuit identifiers to a wireless terminal via a first radio port as part of a telecommunications call; receiving one of said first and second virtual circuit identifiers from said wireless terminal via a second radio port during said telecommunications call.
References Cited (Backward Citations)
US4916691A
Cited
US5195090A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-07-23 | 2000-01-22 | 2000-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-07-23 | 2004-01-22 | 2004-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-07-23 | 2008-01-22 | 2008-07-23 | $7700.00 | Window Closed / Lapsed |