CA2180039C - Transmitting encoded data on unreliable networks - Google Patents
Transmitting encoded data on unreliable networksInfo
- Publication number
- CA2180039C CA2180039C CA002180039A CA2180039A CA2180039C CA 2180039 C CA2180039 C CA 2180039C CA 002180039 A CA002180039 A CA 002180039A CA 2180039 A CA2180039 A CA 2180039A CA 2180039 C CA2180039 C CA 2180039C
- Authority
- CA
- Canada
- Prior art keywords
- encoding
- data
- transmitting
- reset
- resetting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Synchronisation In Digital Transmission Systems (AREA)
- Communication Control (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
Abstract
Information encoded by data compression (or another data encoding technique, e.g. encryption, requiring synchronization between the encoder (12a) and decoder (22b) is transmitted over an unreliable network (16) by checking for transmission errors after decoding. If an error is detected, the encoder (12a) is reset, using a reset protocol, which may operate over an unreliable reverse channel (16) by using a timer (46) to generate further reset requests when the receiver does not acknowledge them in a timely fashion.
Claims (12)
1. A method for transmitting encoded data across unreliable networks, said encoding being of a type in which encoding and decoding are synchronized, said method comprising the steps of:
encoding said data using a data encoding method;
transmitting said encoded data across said unreliable network;
receiving and decoding said data;
subsequently detecting any errors introduced by said unreliable network and resetting said encoding method upon said detection of errors; and at intervals, periodically resynchronizing said encoding method at frame boundaries;
encoding said data using a data encoding method;
transmitting said encoded data across said unreliable network;
receiving and decoding said data;
subsequently detecting any errors introduced by said unreliable network and resetting said encoding method upon said detection of errors; and at intervals, periodically resynchronizing said encoding method at frame boundaries;
2. The method of claim 1 wherein the step of resetting said encoding method includes the steps of:
transmitting a reset request code sequence over a reverse channel upon said detection of errors, wherein said reset request code sequence initiates the resetting of an encoder; and transmitting a reset acknowledgement code sequence over said unreliable network to acknowledge reception of said reset request code sequence, wherein said reset acknowledgement code sequence initiates the resetting of a decoder.
transmitting a reset request code sequence over a reverse channel upon said detection of errors, wherein said reset request code sequence initiates the resetting of an encoder; and transmitting a reset acknowledgement code sequence over said unreliable network to acknowledge reception of said reset request code sequence, wherein said reset acknowledgement code sequence initiates the resetting of a decoder.
3. The method of claim 1, wherein:
said unreliable network further includes a plurality of nodes so arranged that a plurality of paths exist between at least some nodes between which said method is practiced; and wherein at least one node may communicate with more than one node at a time using different encoding methods to communicate with at least two different nodes.
said unreliable network further includes a plurality of nodes so arranged that a plurality of paths exist between at least some nodes between which said method is practiced; and wherein at least one node may communicate with more than one node at a time using different encoding methods to communicate with at least two different nodes.
4. A method for transmitting encoded data across unreliable networks, said encoding being of a type in which encoding and decoding are synchronized, said method comprising the steps of:
encoding said data using a data encoding method;
transmitting said encoded data across said unreliable network;
receiving and decoding said data; and at intervals, periodically resynchronizing said encoding method at frame boundaries.
encoding said data using a data encoding method;
transmitting said encoded data across said unreliable network;
receiving and decoding said data; and at intervals, periodically resynchronizing said encoding method at frame boundaries.
5. The method of claim 4 wherein the resynchronization of said encoding method occurs at every frame boundary.
6. The method of claim 4 wherein said unreliable network includes a plurality of nodes so arranged that a plurality of paths exist between at least some nodes between which said method is practised.
7. The method of claim 6 wherein at least one node may communicate with more than one node at a time.
8. The method of claim 4 wherein said data encoding comprises data compression.
9. The method of claim 4 wherein said data encoding comprises encryption.
10. The method of claim 4 further comprising error correction in which there is selective retransmission of frames.
11. The method of claim 10 wherein said step of periodically resynchronizing is used on a first set of paths in said network and wherein a reset method is used on a second set of paths different from said first set, said reset method comprising the steps of:
encoding said data using a data encoding method;
transmitting said encoded data across said second set of paths in said unreliable network;
receiving and decoding said data;
subsequently detecting any errors introduced by said second paths; and resetting said encoding method upon said detection of errors.
encoding said data using a data encoding method;
transmitting said encoded data across said second set of paths in said unreliable network;
receiving and decoding said data;
subsequently detecting any errors introduced by said second paths; and resetting said encoding method upon said detection of errors.
12. The method of claim 4 wherein the resynchronization of said encoding method comprises the steps of:
resetting said encoding method; and transmitting a reset acknowledgement code sequence over said unreliable network to initiate the resetting of a decoder.
resetting said encoding method; and transmitting a reset acknowledgement code sequence over said unreliable network to initiate the resetting of a decoder.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/458,769 US5130993A (en) | 1989-12-29 | 1989-12-29 | Transmitting encoded data on unreliable networks |
| US458,769 | 1989-12-29 | ||
| CA002069640A CA2069640C (en) | 1989-12-29 | 1990-12-24 | Transmitting encoded data on unreliable networks |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2180039A1 CA2180039A1 (en) | 1991-06-30 |
| CA2180039C true CA2180039C (en) | 1999-01-12 |
Family
ID=25675159
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002180039A Expired - Lifetime CA2180039C (en) | 1989-12-29 | 1990-12-24 | Transmitting encoded data on unreliable networks |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2180039C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1895665A3 (en) * | 2000-07-25 | 2008-08-20 | Juniper Networks, Inc. | System and method for incremental and continuous data compression |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IL153955A0 (en) | 2000-07-25 | 2003-07-31 | Peribit Networks Inc | Network architecture and methods for transparent on-line cross-sessional encoding and transport of network communications data |
| US6856651B2 (en) | 2000-07-25 | 2005-02-15 | Peribit Networks, Inc. | System and method for incremental and continuous data compression |
-
1990
- 1990-12-24 CA CA002180039A patent/CA2180039C/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1895665A3 (en) * | 2000-07-25 | 2008-08-20 | Juniper Networks, Inc. | System and method for incremental and continuous data compression |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2180039A1 (en) | 1991-06-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |