Access protection and priority control in distributed queueing
US5193090A · kind A · utility
Inventors
Key dates
| Filing date | Jun 22, 1990 |
| Grant date | Mar 9, 1993 |
| Priority date | — |
| Expiry date | Jun 22, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L47/10
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Access protection and priority control is performed in a network with distributed queueing by the use of counters and a memory. The counters accumulate a number of passing request bits, the number of packets waiting in a queue, request bits generated, busy bits changed by station, and the numbers of free packets which have passed the station on the communication medium. These request bits indicate that another station wishes to issue a data packet. The counters decrement when a free cell passes the station. The counters indicate a queue placing. The memory stores upper and lower threshold values. These threshold values are compared to the counter values to control the issuing of data packets from each station onto the medium. The imposed thresholds ensure that the bandwidth available to each station is maintained despite traffic load conditions, transmission rates, or length of the medium. This mechanism is applicable to the static and dynamic control of bandwidth usage of stations and nodes used in the I.E.E.E. 802.6 Draft Standard for Distributed Queue Dual Bus Metropolitan Area Networks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.