US5854787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for reducing message error rate within real-time exchange radio-frequency communications systems
Assignee: Trapeze ITS USA LLC
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Filing: 1996-12-13
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Granted: 1998-12-29
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Expires: 2016-12-13
Abstract
Abstract A method for real-time data exchange between an RF modem of a mobile data terminal and a base station host computer of a mobile radio-frequency data communications network is disclosed. In a preferred embodiment, the data exchange timing architecture of the present invention reduces message error rates by accurately predicting signal presence by using a modem hosted by the central processing unit of a mobile data terminal. RF network signal synchronization is improved through precise prediction of the likelihood of message presence, a method that significantly reduces message errors triggered by inadvertent synchronization on signal noise.
Inventors
- 👤 Robert D. Dodge
- 👤 James P. Hubert
- 👤 Ricky D. Wash
- 👤 James A. Minnick
- 👤 Scott J. F. Zogg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:49
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/12; H04L1/16; H04L1/18; H04L1/1829; H04L1/1854
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
160 words
A method for receiving data within a real-time data exchange radio-frequency communications network, comprising: receiving a potential message including a frame header having frame header control data with a radio-frequency modem; reading the number of packets of the potential message from the control data of the received frame header; verifying the message by comparing the frame header to message format information indicated by a status register; ignoring the message if the status cannot be verified; otherwise, converting the packets into a message by performing the steps of: building a modem header and moving the modem header to a buffer for storage of received data; reading a packet from the radio-frequency modem; moving the read packet to the buffer; repeating said packet reading step and said packet moving step until all packets have been read and moved into the buffer; and thereafter, sending an interrupt signal to a main processor thereby indicating the presence of a new message in the buffer.
Claim 2
Independent Claim
160 words
A method for receiving data within a real-time data exchange radio-frequency communications network, comprising: receiving a potential message including a frame header having frame header control data with a radio-frequency modem; reading the number of packets of the potential message from the control data of the received frame header; verifying the message by comparing the frame header to message format information indicated by a status register; ignoring the message if the status cannot be verified; otherwise, converting the packets into a message by performing the steps of: building a modem header and moving the modem header to a buffer for storage of received data; reading a packet from the radio-frequency modem; moving the read packet to the buffer; repeating said packet reading step and said packet moving step until all packets have been read and moved into the buffer; and thereafter, sending an interrupt signal to a main processor thereby indicating the presence of a new message in the buffer.
Claim 3
Dependent Claim
16 words
A method for receiving data according to claim 1, wherein the buffer is a dual-port buffer.
Claim 4
Dependent Claim
21 words
A method for receiving data according to claim 1, wherein said verifying step includes the step of verifying the packet status.
Claim 5
Dependent Claim
28 words
A method for receiving data according to claim 1, further comprising the step of continually receiving potential messages while the radio-frequency modem is in a message receive mode.
Claim 6
Dependent Claim
33 words
A method for receiving data according to claim 4, further comprising the step of setting the radio-frequency modem into a message transmit mode upon the radio-frequency modem receiving a message to be transmitted.
Claim 7
Dependent Claim
33 words
A method for receiving data according to claim 5, further comprising the step of transmitting the message to be transmitted after said step of setting the radio-frequency modem into a message transmit mode.
Claim 8
Dependent Claim
23 words
A method for receiving data according to claim 6, further comprising the step of resetting the radio-frequency modem to after said transmitting step.
Claim 9
Independent Claim
166 words
A method for transmitting data within a real-time data exchange radio-frequency communications network, comprising: sending a message to be transmitted from a main processor to a radio-frequency modem; calculating the time at which to key a radio for transmitting the message, the time at which to transmit the message, and the time at which to unkey the radio; verifying whether the radio-frequency modem is receiving a message; recalculating the radio keying time, the message transmitting time and the radio unkeying time if the radio-frequency modem is receiving a message and repeating said verifying step until the radio-frequency modem is not receiving a message; upon the radio-frequency modem not receiving the message, keying the radio at the calculated radio keying time; inserting the number of packets to be transmitted onto the control data of a frame header and then transmitting the frame header at the calculated message transmitting time; transmitting each packet until all packets have been transmitted; and unkeying the radio at the radio unkeying time.
Claim 10
Independent Claim
166 words
A method for transmitting data within a real-time data exchange radio-frequency communications network, comprising: sending a message to be transmitted from a main processor to a radio-frequency modem; calculating the time at which to key a radio for transmitting the message, the time at which to transmit the message, and the time at which to unkey the radio; verifying whether the radio-frequency modem is receiving a message; recalculating the radio keying time, the message transmitting time and the radio unkeying time if the radio-frequency modem is receiving a message and repeating said verifying step until the radio-frequency modem is not receiving a message; upon the radio-frequency modem not receiving the message, keying the radio at the calculated radio keying time; inserting the number of packets to be transmitted onto the control data of a frame header and then transmitting the frame header at the calculated message transmitting time; transmitting each packet until all packets have been transmitted; and unkeying the radio at the radio unkeying time.
Claim 11
Dependent Claim
23 words
A method for transmitting data according to claim 8, further comprising the step of transmitting a hang byte after said packet transmitting step.
Claim 12
Dependent Claim
28 words
A method for transmitting data according to claim 8, further comprising the step of setting the radio-frequency modem into a message receive mode after said radio unkeying step.
Claim 13
Dependent Claim
29 words
A method for transmitting data according to claim 8, further comprising the step of sending an interrupt signal to the radio-frequency modem thereby indicating the termination of data transmission.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-12-28 | 2002-06-29 | 2002-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-12-28 | 2006-06-29 | 2006-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-12-28 | 2010-06-29 | 2010-12-29 | $7700.00 | Window Closed / Lapsed |