EP1364473A2 - Procede et systeme de telcommunication par satellites et station de base pour un tel systeme - Google Patents
Procede et systeme de telcommunication par satellites et station de base pour un tel systemeInfo
- Publication number
- EP1364473A2 EP1364473A2 EP02703674A EP02703674A EP1364473A2 EP 1364473 A2 EP1364473 A2 EP 1364473A2 EP 02703674 A EP02703674 A EP 02703674A EP 02703674 A EP02703674 A EP 02703674A EP 1364473 A2 EP1364473 A2 EP 1364473A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- zones
- resources
- satellites
- zone
- satellite
- 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.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000010287 polarization Effects 0.000 claims description 20
- 238000010586 diagram Methods 0.000 description 4
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
- H04B7/18539—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection
Definitions
- the invention relates to a method and a system of telecommunications by moving satellites or geostationary satellites as well as to a base station for such a system.
- It relates more particularly to such a telecommunication system in which a territory is divided into zones or cells, having, for example, each a diameter of several hundred kilometers and each zone comprises a pattern of resources such that two adjacent zones do not use the same communication resources.
- FIG. 1 thus represents the zones of a telecommunication system of this type with, within each zone, the pattern of the communication resources which are allocated to this zone.
- the zones form groups of three zones 10, 1 2, 14 which have different patterns. More precisely, different resources in frequency and polarization are assigned to the zones 10, 12 and 14 and the resource patterns are distributed in such a way that two adjacent zones never comprise the same resources.
- the resources indicated within each zone include three frequency sub-bands and two polarizations. These resources are represented by two groups of three binary digits, the left group representing the left polarization and the right group representing the right polarization. In each group, a "0" indicates the absence of a sub-band and a "1" indicates its presence; thus, the first digit on the left corresponds to a first frequency sub-band, the middle digit corresponds to the second sub-band and the right digit, to the third sub-band.
- the resources 1 10 000 indicated for zone 12 mean that the sub-bands n ° 1 and n ° 2 of left polarization are assigned to it.
- Zone 10 is assigned the sub-band n ° 3 of left polarization (001 000) while in zone 14, the three sub-bands of right polarization (000 1 1 1) are assigned.
- FIG. 1 shows that two zones to which the same frequency and polarization resources are allocated are always separated by an intermediate zone to which different resources are allocated.
- the resources allocated to each zone are however used several times because the zone is covered by several satellites.
- three satellites SI, S2 and S3 are provided.
- zone 10 uses the sub-band three times n ° 3 left polarization, once by satellite.
- the communication capacity is therefore multiplied by the number of satellites covering the areas.
- the "spatial diversity" of satellites is used to increase the communications capacity.
- the satellites are either of the geostationary type or of the moving type. In the latter case, the directions of the satellites SI, S2 and S3 change constantly and, in addition, when a satellite is no longer visible from the area, it must first be replaced by a visible satellite, communications relayed by the satellite which disappears from the horizon then being transferred by the replacement satellite.
- the invention makes it possible, for the same communications capacity, to improve the use of the equipment on board the satellites.
- each zone is no longer allocated separate frequency resources but are allocated satellites of different directions.
- each zone (or cell) has all of the frequency resources, but on a single satellite.
- the communications of two adjacent zones are isolated from each other only thanks to the different directions of the satellites.
- the total number of antennas required is reduced.
- Each satellite must have two antennas for the area it must cover.
- the number of antennas or links is six instead of nine as described above, for an amount of equivalent frequency sub-bands allocated to the three zones.
- the resources can be uniformly distributed over the various zones. System management is therefore simplified.
- the frequency sub-bands or other resources used can be processed independently of one another between two zones. For example, from one zone to another, the distribution of each sub-band between the forward channel and the return path may be different. It will be recalled here that the outward path is that of the base station to the terminals and that the return path is from each terminal to the base station.
- the telecommunication system in accordance with the invention can be used for all the zones or only for a part of them, the distribution of the resources being carried out in a conventional manner, as described, by example, in relation to figure 1 for these other resources.
- the invention relates not only to a method of allocating resources to the various zones, this allocation generally being carried out from a management center of the telecommunication system, but also to the equipment of the base stations which are adapted to receive the 'all the resources allocated to the system, or a large part of these resources, and whose antennas are pointed towards a single satellite or satellites used only for this zone and not the other zones of the same system.
- the invention relates to a method for allocating communication resources in a telecommunication system in which communications are relayed by satellites covering a territory divided into zones, each zone comprising a pattern of communication resources consisting of, a on the one hand, directions of the satellites seen from the zones and, on the other hand, frequency and / or polarization sub-bands, these resources being distributed so that two adjacent zones comprise different resources.
- This process is such that the distinction between the patterns of two areas is made only by the direction of the satellite (s) assigned to the areas of this pattern.
- a single satellite is assigned to each zone.
- satellites are assigned to a zone, these satellites not being used for the neighboring zones.
- all the frequency resources are assigned to all the zones, the patterns being distinguished only by the directions of the satellites providing these resources.
- the patterns of two zones are distinguished only by the directions of the satellites with which they communicate while for other parts of the territory, the patterns of two zones are distinguished by other resources such as frequency and / or polarization.
- the same frequency sub-band can be assigned, this sub-band being divided into two parts, one for the outgoing channel and the other for the return channel, the division being different between the first and the second zone.
- the invention also relates to a base station for a telecommunications system in which communications are relayed by satellites covering a territory divided into zones, the communication resources comprising, on the one hand, the directions of the satellites seen from the zones and, d on the other hand, the frequency and / or polarization sub-bands, these resources being distributed so that two adjacent zones are distinguished by at least one of the resources.
- This station is such that it includes means for pointing to at least one satellite, the direction of pointing being different from the direction of pointing for a base station of an adjacent area.
- the base station includes means for receiving all of the communication resources, other than the directions of the satellites, which are assigned to the system.
- FIG. 1 already described, represents a telecommunications system of conventional type
- FIG. 2 is a diagram similar to that of FIG. 1 showing a telecommunication system in accordance with the invention
- FIG. 3 is a diagram showing a zone or cell with a base station, terminals and a satellite
- FIG. 4 is a diagram showing the distribution of resources in a frequency sub-band.
- the invention is, of course, not limited to the example described in which the zones or cells form groups of three elements.
- the number of elements in each group can be arbitrary.
- the number of satellites it must be permanently at least equal to the number of geometrical resources provided in the patterns, a geometrical resource being a satellite direction. However, it can be higher. For example, provision may be made to assign a pair of satellites to an area, provided that the angular direction of this pair of satellites is clearly distinct from the angular directions of the satellites assigned to the adjacent areas.
- the invention makes it possible to standardize the allocation of resources in the various cells. Indeed, if we compare the example of Figure 2 with that shown in Figure 1, we see that in the example of Figure 1 corresponding to a conventional system, three resources (1 sub-band on 3 satellites ) are allocated to zone 10, six resources (2 sub-bands on 3 satellites) are allocated to zone 1 2 and nine resources (3 sub-bands on 3 satellites) are allocated to zone 14 while in the system according to the invention, six resources (6 sub-bands on 1 satellite) are allocated to each of the zones.
- the invention is thus well suited to areas with homogeneous traffic.
- the invention also allows greater flexibility in each sub-band. We can, in fact, distribute the frequencies of each sub-band between the forward and the return channel and this independently of one cell to another because all of the resources are available in the area, unlike a conventional system .
- outward and return path are conventional in a telecommunications system, the meaning of these terms is recalled here.
- a base station 22 which communicates via a satellite S, with all the terminals 24, 242, e ⁇ c - lying in this same zone 20.
- the outward path (arrow f) is the path which leaves from the base station 22 to reach the terminals 24j via the satellite S.
- the return path (arrow R) is that which leaves from a terminal to reach the base station 22.
- each frequency sub-band is divided into two parts 32 and 34, the first part 32 being assigned to the forward channel and the second part 34 being assigned to the return channel.
- These two parts are generally not equal because the traffic is not the same.
- the outbound route corresponds to traffic that is significantly higher than the return route.
- the return channel there are mainly queries or requests to sites while in the outbound channel, more traffic such as program downloads or other information is transmitted.
- the traffic of the outward and return paths may be practically the same. These include, for example, telephone conversations or videoconferences.
- the traffic on the outward and return paths may be different from one zone to another and the invention makes it possible to separate the sub-band into two parts which may be different from one zone to another.
- the various parameters of the telecommunications system are controlled from a centralized management center (not shown) in which is installed a control device for the allocation of resources.
- a management center not shown
- the method according to the invention is mainly implemented in this management center.
- each base station 22 must include an antenna pointed towards a satellite and have means of reception of all of the communication resources or of a large part of the communication resources.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- Aviation & Aerospace Engineering (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Relay Systems (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0102571A FR2821516B1 (fr) | 2001-02-26 | 2001-02-26 | Procede et systeme de telecommunication par satellites et station de base pour un tel systeme |
| FR0102571 | 2001-02-26 | ||
| PCT/FR2002/000476 WO2002069524A2 (fr) | 2001-02-26 | 2002-02-07 | Procede et systeme de telecommunication par satellites et station de base pour un tel systeme |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1364473A2 true EP1364473A2 (fr) | 2003-11-26 |
Family
ID=8860428
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02703674A Withdrawn EP1364473A2 (fr) | 2001-02-26 | 2002-02-07 | Procede et systeme de telcommunication par satellites et station de base pour un tel systeme |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20040157553A1 (fr) |
| EP (1) | EP1364473A2 (fr) |
| JP (1) | JP2004526360A (fr) |
| FR (1) | FR2821516B1 (fr) |
| WO (1) | WO2002069524A2 (fr) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5943324A (en) * | 1994-01-11 | 1999-08-24 | Ericsson, Inc. | Methods and apparatus for mobile station to mobile station communications in a mobile satellite communication system |
| US6157811A (en) * | 1994-01-11 | 2000-12-05 | Ericsson Inc. | Cellular/satellite communications system with improved frequency re-use |
| GB2293725B (en) * | 1994-07-22 | 1999-02-10 | Int Maritime Satellite Organiz | Satellite communication method and apparatus |
| US5867765A (en) * | 1995-03-31 | 1999-02-02 | Telefonaktiebolaget Lm Ericsson | Non-geostationary satellite mobile communication system integration with network principles for terrestrial cellular |
| US6073011A (en) * | 1995-12-19 | 2000-06-06 | Trw Inc. | Communication satellite load balancing system and method |
| US5905943A (en) * | 1997-04-29 | 1999-05-18 | Globalstar L.P. | System for generating and using global radio frequency maps |
| US6246874B1 (en) * | 1998-04-29 | 2001-06-12 | Hughes Electronics Corporation | Method and apparatus for predicting spot beam and satellite handover in a mobile satellite communication network |
| US6088341A (en) * | 1998-09-28 | 2000-07-11 | Teledesic Llc | Method for reducing co-channel of cross-polarization interference in a satellite data communication system by offsetting channel frequencies |
-
2001
- 2001-02-26 FR FR0102571A patent/FR2821516B1/fr not_active Expired - Fee Related
-
2002
- 2002-02-07 WO PCT/FR2002/000476 patent/WO2002069524A2/fr not_active Ceased
- 2002-02-07 US US10/469,088 patent/US20040157553A1/en not_active Abandoned
- 2002-02-07 JP JP2002568531A patent/JP2004526360A/ja active Pending
- 2002-02-07 EP EP02703674A patent/EP1364473A2/fr not_active Withdrawn
Non-Patent Citations (1)
| Title |
|---|
| See references of WO02069524A3 * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2821516A1 (fr) | 2002-08-30 |
| WO2002069524A3 (fr) | 2002-11-28 |
| JP2004526360A (ja) | 2004-08-26 |
| FR2821516B1 (fr) | 2005-09-09 |
| US20040157553A1 (en) | 2004-08-12 |
| WO2002069524A2 (fr) | 2002-09-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2723002B1 (fr) | Système de télécommunication par satellite permettant d'assurer un trafic en étoile et un trafic maillé | |
| FR2470493A1 (fr) | Configuration de satellite destinee a augmenter la marge de pluie d'un systeme de telecommunications | |
| EP3188399B1 (fr) | Émetteur récepteur ibfd à module de transposition de fréquence non réciproque | |
| EP3503431B1 (fr) | Procede de couverture multifaisceaux par regroupement de faisceaux elementaires de meme couleur, et charge utile de telecommunications pour mettre en uvre un tel procede | |
| FR2735306A1 (fr) | Systeme de telecommunications sous-orbital a haute altitude et a haute efficacite | |
| FR2690010A1 (fr) | Procédé de commande d'une antenne à balayage. | |
| EP0749217B1 (fr) | Système de communication par satellites à défilement, satellite, station et terminal y inclus | |
| EP2930862B1 (fr) | Système et procédé de télécommunication par satellite à couverture terrestre avec des pinceaux d'antenne multiples comportant des moyens de répartition de capacité variable entre les pinceaux d'antenne. | |
| EP1170823B1 (fr) | Antenne de télécommunication destinée à couvrir une large zone terrestre | |
| WO2000069093A1 (fr) | Terminal de communication bidirectionnel multimedia | |
| CA2070082C (fr) | Systeme de communications par satellites en orbite basse a destination de terminaux mobiles | |
| FR2756696A1 (fr) | Systeme de telecommunications par satellites et procede de mise en oeuvre | |
| JP2002516548A (ja) | Ocdma衛星通信システムにおける電波密度低減 | |
| FR2796229A1 (fr) | Procede et systeme de telecommunication par satellites defilants dans lequel les communications sont transferables d'un satellite a un autre | |
| EP1364473A2 (fr) | Procede et systeme de telcommunication par satellites et station de base pour un tel systeme | |
| EP3975434A1 (fr) | Systeme et procede de suppression de signaux interferents montants generes a l'interieur d'un systeme spatial de communication multi-spots | |
| FR3069990A1 (fr) | Architecture de charge utile flexible pour applications vhts et hts | |
| FR3067535A1 (fr) | Satellite de telecommunications, procede de formation de faisceaux et procede de fabrication d’une charge utile de satellite | |
| EP1104124B1 (fr) | Système de routage de télécommunication par satellite | |
| WO2003065615A1 (fr) | Station de base en diversite pour système de télécommunication | |
| FR3097710A1 (fr) | Charge utile de télécommunications àflexibilité de couverture et de capacité | |
| FR2735303A1 (fr) | Systeme de communication par satellites a defilement, satellite, station et terminal y inclus | |
| CA2193573A1 (fr) | Procede et systeme de transmission de signaux radioelectriques via un reseau de satellites entre une station terrestre fixe et des terminaux mobiles d'usagers | |
| FR2969431A1 (fr) | Satellite de diffusion a couverture multifaisceaux et plan de frequence flexible |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 20030926 |
|
| AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
| 17Q | First examination report despatched |
Effective date: 20040428 |
|
| RTI1 | Title (correction) |
Free format text: SATELLITE TELECOMMUNICATION METHOD AND SYSTEM AND BASE STATION FOR SUCH A SYSTEM |
|
| GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
| GRAC | Information related to communication of intention to grant a patent modified |
Free format text: ORIGINAL CODE: EPIDOSCIGR1 |
|
| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: ALCATEL LUCENT |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 20070503 |