Process for transferring data packets

• US 5,029,334 A
• Filed: 03/21/1990
• Issued: 07/02/1991
• Est. Priority Date: 03/21/1989
• Status: Expired due to Fees

• Current Assignee: ASEA Brown Boveri Limited Ch-5401 Baden Switzerland
• Original Assignee: ASEA Brown Boveri SA de CV (ABB Limited)
• Inventors: Braun, Walter, Hagmann, Walter
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): Ton, Dang
• Application Number:
  US07/497,118
• Time in Patent Office: 468 Days
• Field of Search: 370/60, 370/60.1, 370/94.1, 370/94.2, 370/16, 370/95.1, 370/95.2, 370/18, 340/310 A, 340/310 R, 340/, 379/60, 455/135, 455/33
• US Class Current: 370/252
• CPC Class Codes: H04B 2203/5408 using protocols
• CPC Class Codes: H04B 2203/5425 improving S/N by matching impedance, noise reduction, gain control
• CPC Class Codes: H04B 2203/5445 Local network
• CPC Class Codes: H04B 3/542 the information being in digital form
• CPC Class Codes: H04L 12/403 with centralised control, e.g. polling
• CPC Class Codes: H04L 45/00 Routing or path finding of packets in data switching networks routing or path finding in wireless networks H04W40/00
• CPC Class Codes: H04L 45/42 Centralised routing

Abstract

A process for transferring data packets in a network having a master station, plural subscriber stations, and a common gated channel, wherein each subscriber station records the data package received by it and a transmission quality level of the data package received by the respective subscriber station; each subscriber station reports the recorded transmission quality levels to the master station; the master station determines at least one data routing for each subscriber station on the basis of the transmission quality levels reported to the master station; and a data packet directed to a certain subscriber station is transferred according to the determined data routing. The process is particularly suitable fo the transferral of data packets via the supply lines of a medium- and low-voltage network.

Claims

1. A process for transferring data packets in a network having a master station and a plurality of subscriber stations, wherein the subscriber stations are connected to the master station by a common data channel which has a location and time-dependent transmission reliability, wherein:

the subscriber stations record data packets received by them on the common channel and in each case record a variable for determining the transmission quality of said data packets;

the subscriber stations report the recorded and determined transmission quality levels to the master station;

the master station determines at least one data routing for each subscriber station on the basis of a logical connecting structure which lists all direct connections having a minimum transmission quality;

said data routing indicates whether a particular subscriber station is directly connected to the master and if not, which other subscriber stations are to be used as a relay when exchanging data packets between master station and the particular subscriber station; and

data packets which are intended for at least one of the subscriber stations are transferred according to the determined data routing.

2. A process as claimed in claim 1, wherein each subscriber station continuously records the transmission quality and wherein the data routing is renewed if the transmission quality does not fulfill a given quality criterion.

5. A process as claimed in claim 1, wherein the transmission quality is calculated with the aid of the ratio of signal to noise.

6. A process as claimed in claim 1, wherein the master station repeats the special information requests for the incorporation of new subscriber stations at certain, regular or irregular intervals.

7. A process as claimed in claim 1, wherein the lines of an electrical power distribution network at the low- and medium-voltage level are used as a common data channel.

8. A process as claimed in claim 1, wherein FH/PSK signals are used for the exchange of data.

3. A process as claimed in claim 3, wherein the master station tests the transmission quality from time to time.

4. A process as claimed in claim 4, wherein the transmission quality is tested by reference to an average number of interference-induced repetitions.

9. A process for incorporating a new subscriber station into a network having a master station and a plurality of subscriber stations, wherein the subscriber stations are connected to the master station by a common data channel which has a location and time-dependent transmission reliability, wherein:

a subscriber station which is to be newly incorporated into the network intercepts the on-going data traffic between the master station and the subscriber stations which are already incorporated into the network and records the transmission quality levels at which said new subscriber station receives the ongoing data traffic between the master station and the subscriber stations which are already incorporated;

the master station issues a special information request for the purpose of incorporating the new subscriber station, said special information request containing a quality characteristic for the connection formed between the master station and the new subscriber station; and

this new subscriber station only replies to the special information request and only reports the recorded transmission quality levels to the master station if the quality characteristic fulfills a given criterion.