Efficient frequency division duplex communication system with interleaved format and timing adjustment control
US5689502A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 5, 1995 |
| Grant date | Nov 18, 1997 |
| Priority date | — |
| Expiry date | Jun 5, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W48/16
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A system for efficient time division duplex communication between a base station and a plurality of user stations over multiple frequency bands whereby guard time overhead is reduced through use of an interleaved frame structure and active adjustment of reverse link transmission timing as a function of round trip propagation time. A time frame is divided into a plurality of time slots. A user station transmits a preamble over a user frequency band. The base station receives the preamble and transmits, in a given time slot, a forward link message over a base frequency band to a user station. The user station responds with a reverse link message over the user frequency band in a subsequent time slot. While the base station is transmitting to a first user station over the base frequency band, it receives messages from another user station over the user frequency band, using the time slot differential between forward and reverse link messages for round trip propagation. The base station may, based on a measured propagation delay, command the user station to adjust its reverse link transmission timing so as to allow for reduced guard times. The base station may also instruct the user st…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.