CA2432347A1 - Multi-beam tdma satellite mobile communications system - Google Patents
Multi-beam tdma satellite mobile communications system Download PDFInfo
- Publication number
- CA2432347A1 CA2432347A1 CA002432347A CA2432347A CA2432347A1 CA 2432347 A1 CA2432347 A1 CA 2432347A1 CA 002432347 A CA002432347 A CA 002432347A CA 2432347 A CA2432347 A CA 2432347A CA 2432347 A1 CA2432347 A1 CA 2432347A1
- Authority
- CA
- Canada
- Prior art keywords
- earth
- satellite
- signal
- link
- mobile terminals
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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- Radio Relay Systems (AREA)
Abstract
An earth station (8) receives a return signal (3) via more than one satellite link (4a, 4b) from a mobile terminal (2) using TDMA.
The earth station (8) selects one or more of the satellite links (4a) for transmitting a forward signal (15) on the basis of the quality of signal (3; 15) received via each link. The earth section (8) allocates frequency channels to the mobile terminals (2) according to their location on the surface of the earth, so that the propagation time to and from those mobile terminals (2) which share the same frequency channel is approximately the same. The satellite (4a; 4b) includes an antenna which generates an array of beams which are individually pointed to fixed regions of the earth, until the elevation of the satellite (4a; 4b) relative to a fixed region falls below a minimum value, in which case the corresponding beam is redirected to a new area, while the other beams remain pointed at the corresponding fixed areas. In this way, beam-to-beam handover is reduced, while maintaining the boresight of the antenna pointing at the nadir.
The earth station (8) selects one or more of the satellite links (4a) for transmitting a forward signal (15) on the basis of the quality of signal (3; 15) received via each link. The earth section (8) allocates frequency channels to the mobile terminals (2) according to their location on the surface of the earth, so that the propagation time to and from those mobile terminals (2) which share the same frequency channel is approximately the same. The satellite (4a; 4b) includes an antenna which generates an array of beams which are individually pointed to fixed regions of the earth, until the elevation of the satellite (4a; 4b) relative to a fixed region falls below a minimum value, in which case the corresponding beam is redirected to a new area, while the other beams remain pointed at the corresponding fixed areas. In this way, beam-to-beam handover is reduced, while maintaining the boresight of the antenna pointing at the nadir.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9414829.3 | 1994-07-22 | ||
| GB9414829A GB2293725B (en) | 1994-07-22 | 1994-07-22 | Satellite communication method and apparatus |
| CA002195662A CA2195662C (en) | 1994-07-22 | 1995-05-16 | Multi-beam tdma satellite mobile communications system |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002195662A Division CA2195662C (en) | 1994-07-22 | 1995-05-16 | Multi-beam tdma satellite mobile communications system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2432347A1 true CA2432347A1 (en) | 1996-02-08 |
| CA2432347C CA2432347C (en) | 2005-08-02 |
Family
ID=28675932
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002432347A Expired - Fee Related CA2432347C (en) | 1994-07-22 | 1995-05-16 | Multi-beam tdma satellite mobile communications system |
| CA002432345A Abandoned CA2432345A1 (en) | 1994-07-22 | 1995-05-16 | Multi-beam tdma satellite mobile communications system |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002432345A Abandoned CA2432345A1 (en) | 1994-07-22 | 1995-05-16 | Multi-beam tdma satellite mobile communications system |
Country Status (1)
| Country | Link |
|---|---|
| CA (2) | CA2432347C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114826376A (en) * | 2022-03-30 | 2022-07-29 | 大连大学 | Micro-nano satellite multi-target optimization resource allocation method |
-
1995
- 1995-05-16 CA CA002432347A patent/CA2432347C/en not_active Expired - Fee Related
- 1995-05-16 CA CA002432345A patent/CA2432345A1/en not_active Abandoned
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114826376A (en) * | 2022-03-30 | 2022-07-29 | 大连大学 | Micro-nano satellite multi-target optimization resource allocation method |
| CN114826376B (en) * | 2022-03-30 | 2023-11-10 | 大连大学 | Multi-objective optimized resource allocation method for micro-nano satellite |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2432345A1 (en) | 1996-02-08 |
| CA2432347C (en) | 2005-08-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |