Data packet transmission system accommodating different substation response times
US5189670A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 28, 1991 |
| Grant date | Feb 23, 1993 |
| Priority date | — |
| Expiry date | Jan 28, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W84/08
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Data packets of mutually equal durations are transmitted from a plurality of substations to a main station via one or more transmission channels. The main station transmits on each transmission channel a synchronizing signal which indicates the beginning of a frame. A programmable memory stores maximum link establishment and maximum link disetablishment times which are characteristic of the transmission channel from the substations to the main station. The substations each comprise a programmable memory for storing the maximum establishment times and disestablishment times. On reception of the synchronizing signal on a transmission channel the substation subdivides the frame into a number of consecutive time slots of mutually equal durations at least equal to the sum of the duration of a data packet, and the stored maximum establishment and disestablishment times of that transmission channel. If desired, the substation selects a time slot from the sequence of time slots and transmits the data packet within the selected time slot, beginning at a time equivalent to the stored maximum link establishment time of that transmission channel after the beginning of the selected time slot, a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.