Collision avoidance of rach signals in a TDMA satellite communication system
US7457269B1 · kind B1 · utility
43Cited by
5References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 20, 2000 |
| Grant date | Nov 25, 2008 |
| Priority date | — |
| Expiry date | Apr 20, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W74/0866
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In a cellular mobile telephone system, a mobile station (4d, 4e) requests allocation of a traffic channel by sending a request in a random access channel. Where there is a significant path length difference between locations in a cell and a network antenna, for instance on a satellite (3), not all of the available TDMA slots are used for random access signals. Instead, gaps of one to three time slots are left between valid random access time slots (103, 104) to avoid collision between random access bursts arriving at the network antenna along paths of different lengths.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.