Patent US5335233A successfully refreshed from Google Patents.
US5335233A
Expired / Lapsed
US
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Data packet format
Assignee: International Business Machines Corp
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Filing: 1990-12-31
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Granted: 1994-08-02
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Expires: 2010-12-31
Abstract
Abstract A protocol and data packaging format optimized for transmissions over noisy communications links is disclosed. The data packaging format provides a modified High-level Data Link Control (HDLC) control mechanism incorporated into a normal data communication header thus eliminating the requirement for control messages to acknowledge or reject transmissions. An eight bit value is used to encode a toggle bit status for each of eight possible transmit sequence numbers. The eight bit value when used alone, constitutes a null frame indicating data-free feedback. The null frame is used to confirm receipt of data frames. This eight bit value is also used as the first byte of every data frame. The second byte of the data frame consists of a four-bit logical channel index, a single bit transmit toggle bit and a three-bit transmit sequence number. The second byte of the data frame may be followed by zero or more eight-bit data bytes. When a data frame arrives at a receiver, the bit value of the transmit toggle bit is copied into one of the eight bits of the first byte according to the transmit sequence number. The receiver sends the newly modified first byte back to the sender as part of a data frame transfer or as a null frame to confirm receipt of the data frame.
Inventors
- 👤 Michael E. Nagy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:11
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/12; H04L1/16; H04L1/1607; H04L1/1642; H04L1/1671
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
114 words
A method of encoding a plurality of high-level data link control data frames to allow identification and re-transmission of only the ones of said plurality of high-level data link control data frames having an error, comprising the steps of: providing an address byte in each of said high-level data link control data frames having a plurality of individual bits for identifying each of said plurality of high-level data link control data frames at a receive; associating each of said plurality of high-level data link control data frames with one of said plurality of individual bits in said address byte at said receiver before transmitting said high-level data link control data frames to a transmitter.
Claim 2
Independent Claim
114 words
A method of encoding a plurality of high-level data link control data frames to allow identification and re-transmission of only the ones of said plurality of high-level data link control data frames having an error, comprising the steps of: providing an address byte in each of said high-level data link control data frames having a plurality of individual bits for identifying each of said plurality of high-level data link control data frames at a receive; associating each of said plurality of high-level data link control data frames with one of said plurality of individual bits in said address byte at said receiver before transmitting said high-level data link control data frames to a transmitter.
Claim 3
Dependent Claim
46 words
A method of encoding a plurality of high-level data link control data frames to allow identification and re-transmission of only the ones of said plurality of hihg-level data link control data frames having an error as in claim 1, wherein said address byte contains eight bits.
Claim 4
Dependent Claim
73 words
A method of encoding a plurality of high-level data link control data frames to allow identification and retransmission of only the ones of said plurality of high-level data link control data frames having an error as in claim 1, wherein said address byte is used to confirm receipt of one of said plurality of data frames by said receiver by writing a transmit toggle bit transmitted by said transmitter into said address byte.
Claim 5
Dependent Claim
59 words
A method of encoding a plurality of high-level data link control data frames to allow identification and retransmission of only the ones of said plurality of high-level data link control data frames having an error as in claim 1, wherein said address byte is a first byte of one of said plurality of high-level data link control data frames.
Claim 6
Independent Claim
160 words
A method of encoding a plurality of high-level data link control data frames to allow identification and re-transmission of only the ones of said plurality of high-level data link control data frames having an error, comprising the steps of: providing a control byte in one of said plurality of high-level data link control data frames at a transmitter having a transmit toggle bit and a plurality of transmit sequence number bits; associating one of said plurality of high-level data link control data frames with said transmit toggle bit and said transmit sequence number bits in said control byte at said transmitter and transmitting said one of said plurality of high-level data link control data frames to a receiver; and receiving said hihg-level data link control data frame at said receiver and writing said transmit toggle bit into an address byte based on the value of said transmit sequence number and transmitting said address byte to said transmitter for error determination.
Claim 7
Independent Claim
160 words
A method of encoding a plurality of high-level data link control data frames to allow identification and re-transmission of only the ones of said plurality of high-level data link control data frames having an error, comprising the steps of: providing a control byte in one of said plurality of high-level data link control data frames at a transmitter having a transmit toggle bit and a plurality of transmit sequence number bits; associating one of said plurality of high-level data link control data frames with said transmit toggle bit and said transmit sequence number bits in said control byte at said transmitter and transmitting said one of said plurality of high-level data link control data frames to a receiver; and receiving said hihg-level data link control data frame at said receiver and writing said transmit toggle bit into an address byte based on the value of said transmit sequence number and transmitting said address byte to said transmitter for error determination.
Claim 8
Dependent Claim
69 words
A method of encoding a plurality of high-level data link control data frames to allow identification and re-transmission of only the ones of said plurality of high-level data link control data frames having an error as in claim 5, wherein said associating step assigns each of said plurality of high-level data link control data frames a sequential sequence number from zero to seven in said transmit sequence number bits.
Claim 9
Dependent Claim
63 words
A method of encoding a plurality of high-level data link control data frames to allow identification and re-transmission of only the ones of said plurality of high-level data link control data frames having an error as in claim 5, wherein said associating step assigns each of said plurality of high level data link control data frames a value in said transmit toggle bit.
Claim 10
Independent Claim
155 words
A method of creating a plurality of packets for transmission over a communication link such that identification and re-transmission of only the ones of said plurality of packets having an error will occur, comprising the steps of: providing a control byte in said plurality of packets at a transmitter having a transmit toggle bit, at least one logical index bit and at least one transmit sequence number bit; providing an address byte at said transmitter having a plurality of individual bits for identifying by a receiver each of said plurality of packets; associating at said transmitter each of said plurality of packets with said logical channel index bit, transmit toggle bit and transmit sequence number bit and transmitting said packets to said receiver; and receiving said plurality of packets at said receiver and writing said transmit toggle bit to said receive toggle bits and transmitting said receive toggle bits to said transmitter for error determination.
Claim 11
Independent Claim
155 words
A method of creating a plurality of packets for transmission over a communication link such that identification and re-transmission of only the ones of said plurality of packets having an error will occur, comprising the steps of: providing a control byte in said plurality of packets at a transmitter having a transmit toggle bit, at least one logical index bit and at least one transmit sequence number bit; providing an address byte at said transmitter having a plurality of individual bits for identifying by a receiver each of said plurality of packets; associating at said transmitter each of said plurality of packets with said logical channel index bit, transmit toggle bit and transmit sequence number bit and transmitting said packets to said receiver; and receiving said plurality of packets at said receiver and writing said transmit toggle bit to said receive toggle bits and transmitting said receive toggle bits to said transmitter for error determination.
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) | 1997-08-01 | 1998-01-31 | 1998-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-01 | 2002-01-31 | 2002-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-01 | 2006-01-31 | 2006-08-02 | $7700.00 | Window Closed / Lapsed |