US5721725A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protocol for channel access in wireless or network data communication
Assignee: Xerox Corp
•
Filing: 1995-10-30
•
Granted: 1998-02-24
•
Expires: 2015-10-30
Abstract
Abstract In a carrier sense multiple-access (CSMA) network, such as a wireless network or a LAN, a transceiver which initiates a transmission to a recipient transceiver in the same medium sends out, prefatory to a bulk of data, a field representative of the length of the data, and another field symbolic of the rate at which the data is to be sent. Non-participant transceivers in the medium receive the data length field and the data rate field, and calculate a length of time they must inhibit themselves to avoid a data collision with the transmitting transceiver, while the participants come to a common agreement at which they can send and receive data.
Inventors
- 👤 Roy Want
- 👤 William N. Schilit
- 👤 Richard J. Goldstein
- 👤 Norman I. Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:31
CPC Classifications
H; H04; H04W; H04W48/00; H04W48/08; H04L; H04L12/00; H04L12/28; H04L12/40; H04L12/407; H04L12/413; H04W28/00; H04W28/16; H04W28/18; H04W28/22; H04W74/00; H04W74/08; H04W74/0808
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
203 words
A method of operating transceivers where a plurality of transceivers are operable to exchange data over a medium, comprising the steps of: a first transceiver sending a data-length field over the medium, the data-length field being symbolic of an amount of data in a transmission desired to be sent by the first transceiver; the first transceiver sending a data-rate field over the medium, the data-rate field being symbolic of a transmission rate of data in a transmission desired to be sent by the first transceiver; a second transceiver sending a response data-rate field to the first transceiver, the response data-rate field being symbolic of a transmission rate of data in a transmission desired to be received by the second transceiver; the first transceiver sending data to the second transceiver at a data rate symbolized in the response data-rate field; the first transceiver comparing the data-rate field to the response data rate field; and when the response data-rate field is not equal to the data-rate field, the first transceiver sending over the medium a "request to send" signal and a revised data-rate field, the revised data-rate field being symbolic of a data rate equal to the data rate symbolized by the response data-rate field.
Claim 2
Independent Claim
203 words
A method of operating transceivers where a plurality of transceivers are operable to exchange data over a medium, comprising the steps of: a first transceiver sending a data-length field over the medium, the data-length field being symbolic of an amount of data in a transmission desired to be sent by the first transceiver; the first transceiver sending a data-rate field over the medium, the data-rate field being symbolic of a transmission rate of data in a transmission desired to be sent by the first transceiver; a second transceiver sending a response data-rate field to the first transceiver, the response data-rate field being symbolic of a transmission rate of data in a transmission desired to be received by the second transceiver; the first transceiver sending data to the second transceiver at a data rate symbolized in the response data-rate field; the first transceiver comparing the data-rate field to the response data rate field; and when the response data-rate field is not equal to the data-rate field, the first transceiver sending over the medium a "request to send" signal and a revised data-rate field, the revised data-rate field being symbolic of a data rate equal to the data rate symbolized by the response data-rate field.
Claim 3
Independent Claim
181 words
A method of operating transceivers where a plurality of transceivers are operable to exchange data over a medium, comprising the steps of: a first transceiver sending a data-length field over the medium, the data-length field being symbolic of an amount of data in a transmission desired to be sent by the first transceiver; the first transceiver sending a data-rate field over the medium, the data-rate field being symbolic of a transmission rate of data in a transmission desired to be sent by the first transceiver; a second transceiver sending a response data-rate field to the first transceiver, the response data-rate field being symbolic of a transmission rate of data in a transmission desired to be received by the second transceiver; the first transceiver sending data to the second transceiver at a data rate symbolized in the response data-rate field; and the first transceiver sending over the medium a rate confirmation packet, the rate confirmation packet including a revised data-rate field, the revised data-rate field being symbolic of a data rate equal to the data rate symbolized by the response data-rate field.
Claim 4
Independent Claim
181 words
A method of operating transceivers where a plurality of transceivers are operable to exchange data over a medium, comprising the steps of: a first transceiver sending a data-length field over the medium, the data-length field being symbolic of an amount of data in a transmission desired to be sent by the first transceiver; the first transceiver sending a data-rate field over the medium, the data-rate field being symbolic of a transmission rate of data in a transmission desired to be sent by the first transceiver; a second transceiver sending a response data-rate field to the first transceiver, the response data-rate field being symbolic of a transmission rate of data in a transmission desired to be received by the second transceiver; the first transceiver sending data to the second transceiver at a data rate symbolized in the response data-rate field; and the first transceiver sending over the medium a rate confirmation packet, the rate confirmation packet including a revised data-rate field, the revised data-rate field being symbolic of a data rate equal to the data rate symbolized by the response data-rate field.
Claim 5
Dependent Claim
182 words
A transceiver operable to exchange data over a medium, comprising: means for sending a data-length field over the medium, the data-length field being symbolic of an amount of data in a transmission desired to be sent by the first transceiver; means for sending a data-rate field over the medium; the data-rate field being symbolic of a transmission rate of data in a transmission desired to be sent by the transceiver; means for receiving a response data-rate field over the medium; the response data-rate field being symbolic of a transmission rate of data in a transmission desired to be received by a second transceiver; means for sending data to the second transceiver at a data rate symbolized in the response data-rate field; means for comparing the data-rate field to the response data-rate field; and means for sending over the medium a "request to send" signal and a revised data-rate field, the revised data-rate field being symbolic of a data rate equal to the data rate symbolized by the response data-rate field, when the response data-rate field is not equal to the data-rate field.
Claim 6
Dependent Claim
182 words
A transceiver operable to exchange data over a medium, comprising: means for sending a data-length field over the medium, the data-length field being symbolic of an amount of data in a transmission desired to be sent by the first transceiver; means for sending a data-rate field over the medium; the data-rate field being symbolic of a transmission rate of data in a transmission desired to be sent by the transceiver; means for receiving a response data-rate field over the medium; the response data-rate field being symbolic of a transmission rate of data in a transmission desired to be received by a second transceiver; means for sending data to the second transceiver at a data rate symbolized in the response data-rate field; means for comparing the data-rate field to the response data-rate field; and means for sending over the medium a "request to send" signal and a revised data-rate field, the revised data-rate field being symbolic of a data rate equal to the data rate symbolized by the response data-rate field, when the response data-rate field is not equal to the data-rate field.
Claim 7
Dependent Claim
162 words
A transceiver operable to exchange data over a medium, comprising: means for sending a data-length field over the medium, the data-length field being symbolic of an amount of data in a transmission desired to be sent by the first transceiver; means for sending a data-rate field over the medium, the data-rate field being symbolic of a transmission rate of data in a transmission desired to be sent by the transceiver; means for receiving a response data-rate field over the medium, the response data-rate field being symbolic of a transmission rate of data in a transmission desired to be received by a second transceiver; means for sending data to the second transceiver at a data rate symbolized in the response data-rate field; and means for sending over the medium a rate confirmation packet, the rate confirmation packet including a revised data-rate field, the revised data-rate field being symbolic of a data rate equal to the data rate symbolized by the response data-rate field.
Claim 8
Dependent Claim
162 words
A transceiver operable to exchange data over a medium, comprising: means for sending a data-length field over the medium, the data-length field being symbolic of an amount of data in a transmission desired to be sent by the first transceiver; means for sending a data-rate field over the medium, the data-rate field being symbolic of a transmission rate of data in a transmission desired to be sent by the transceiver; means for receiving a response data-rate field over the medium, the response data-rate field being symbolic of a transmission rate of data in a transmission desired to be received by a second transceiver; means for sending data to the second transceiver at a data rate symbolized in the response data-rate field; and means for sending over the medium a rate confirmation packet, the rate confirmation packet including a revised data-rate field, the revised data-rate field being symbolic of a data rate equal to the data rate symbolized by the response data-rate field.
References Cited (Backward Citations)
US5361063A
Cited
US5369639A
Cited
US5319641A
Cited
US5123029A
Cited
US5231634A
Cited
US5231634B1
Cited
US5335226A
Cited
US5329531A
Cited
US5530695A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-02-23 | 2001-08-25 | 2002-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-02-23 | 2005-08-25 | 2006-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-02-23 | 2009-08-25 | 2010-02-24 | $7700.00 | Window Closed / Lapsed |