Patent US5633868A successfully refreshed from Google Patents.
US5633868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Virtual circuit management in cellular telecommunications
Assignee: Nokia of America Corp
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Filing: 1994-10-17
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Granted: 1997-05-27
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Expires: 2014-10-17
Abstract
Abstract A method and apparatus for managing a virtual circuit network is disclosed that enables hand-off management. An illustrative embodiment establishes a virtual ciruit by receiving, at a radio port, a virtual circuit identifier from a wireless terminal and attaching the virtual circuit identifier to an OA&M cell. The radio port then transmits, over a pre-established unidirectional virtual ciruit, the OA&M cell to a radio port manager.
Inventors
- 👤 John H. Baldwin
- 👤 Helen Chu
- 👤 Bharat T. Doshi
- 👤 Subrahmanyam Dravida
- 👤 Sanjiv Nanda
- 👤 Philip A. Treventi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:05
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/24; H04B7/26; H04W; H04W92/00; H04W92/04; H04W92/12; H04Q; H04Q11/00; H04Q11/04; H04Q11/0428; H04Q11/0478; H04L; H04L12/00; H04L12/54; H04L12/56; H04L12/5601; H04L2012/5603; H04L2012/5604; H04L2012/5607; H04L2012/5625; H04W24/00; H04W36/00; H04W36/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
88 words
A method for establishing a downlink virtual circuit comprising: receiving, at a radio port, a virtual circuit identifier from a wireless terminal; attaching said virtual circuit identifier to an OA&M cell; sending a set-reverse-VC message in said OA&M cell; transmitting, from said radio port, said OA&M cell to a radio port manager over an uplink virtual circuit; receiving said OA&M cell by a switch in said uplink virtual circuit; reading said set-reverse-VC message; and in response to said set-reverse-VC message, establishing said downlink virtual circuit in said switch.
Claim 2
Independent Claim
88 words
A method for establishing a downlink virtual circuit comprising: receiving, at a radio port, a virtual circuit identifier from a wireless terminal; attaching said virtual circuit identifier to an OA&M cell; sending a set-reverse-VC message in said OA&M cell; transmitting, from said radio port, said OA&M cell to a radio port manager over an uplink virtual circuit; receiving said OA&M cell by a switch in said uplink virtual circuit; reading said set-reverse-VC message; and in response to said set-reverse-VC message, establishing said downlink virtual circuit in said switch.
Claim 3
Dependent Claim
21 words
The method of claim 1 further comprising transmitting from said radio port manager to said radio port a handoff confirmation message.
Claim 4
Independent Claim
154 words
A method for establishing a downlink virtual circuit comprising: creating a plurality of virtual circuit identifiers, each of which is associated with the others; transmitting said plurality of virtual circuit identifiers to a wireless terminal via a first radio port; communicating with said wireless terminal via said first radio port with one of said plurality of virtual circuit identifiers; receiving, at a second radio port, another one of said plurality of virtual circuit identifiers from said wireless terminal; attaching said another one of said plurality of virtual circuit identifiers to an OA&M cell; sending a set-reverse-VC message in said OA&M cell; transmitting, from said second radio port, said OA&M cell to a radio port manager over a uplink virtual circuit; receiving said OA&M cell by a switch in said uplink virtual circuit; reading said set-reverse-VC message by said switch; and in response to said set-reverse-VC message, establishing said downlink virtual circuit in said switch.
Claim 5
Independent Claim
154 words
A method for establishing a downlink virtual circuit comprising: creating a plurality of virtual circuit identifiers, each of which is associated with the others; transmitting said plurality of virtual circuit identifiers to a wireless terminal via a first radio port; communicating with said wireless terminal via said first radio port with one of said plurality of virtual circuit identifiers; receiving, at a second radio port, another one of said plurality of virtual circuit identifiers from said wireless terminal; attaching said another one of said plurality of virtual circuit identifiers to an OA&M cell; sending a set-reverse-VC message in said OA&M cell; transmitting, from said second radio port, said OA&M cell to a radio port manager over a uplink virtual circuit; receiving said OA&M cell by a switch in said uplink virtual circuit; reading said set-reverse-VC message by said switch; and in response to said set-reverse-VC message, establishing said downlink virtual circuit in said switch.
Claim 6
Dependent Claim
45 words
The method of claim 3 further comprising communicating concurrently with said wireless terminal via said first radio port with said one of said plurality of virtual circuit identifiers and via said second radio port with said another one of said plurality of virtual circuit identifiers.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-05-26 | 2000-11-25 | 2001-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-05-26 | 2004-11-25 | 2005-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-05-26 | 2008-11-25 | 2009-05-27 | $7700.00 | Window Closed / Lapsed |