Frequency division multiplexed acknowledge back paging system
US4875038A · kind A · utility
200Cited by
13References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 7, 1988 |
| Grant date | Oct 17, 1989 |
| Priority date | — |
| Expiry date | Jan 7, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W84/025
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An acknowledge back (ack-back) paging system is provided which includes a central station which transmits a group of message signals to a group of ack-back pagers which are addressed as a group. The users of the group of addressed ack-back pagers indicate a response to their respective pagers thus providing ack-back data. The pagers in the group of addressed ack-back pagers then simultaneously transmit back to the central station their ack-back data on different frequency sub-bands, a different frequency sub-band being allocated to each of the pagers in the group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.