WO1998042087A2 - Method for transmitting information to a mobile part of a satellite telecommunications system - Google Patents
Method for transmitting information to a mobile part of a satellite telecommunications systemInfo
- Publication number
- WO1998042087A2 WO1998042087A2 PCT/DE1998/000704 DE9800704W WO9842087A2 WO 1998042087 A2 WO1998042087 A2 WO 1998042087A2 DE 9800704 W DE9800704 W DE 9800704W WO 9842087 A2 WO9842087 A2 WO 9842087A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- long
- satellite
- information
- spp
- handset
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/02—Arrangements for relaying broadcast information
- H04H20/06—Arrangements for relaying broadcast information among broadcast stations
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H2201/00—Aspects of broadcast communication
- H04H2201/70—Aspects of broadcast communication characterised in that receivers can be addressed
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
- H04H60/35—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users
- H04H60/49—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying locations
- H04H60/51—Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying locations of receiving stations
Definitions
- the invention relates to a method for transmitting information to a mobile part of a satellite telecommunication system with at least one communications satellite.
- the invention also relates to a satellite telecommunication system with at least one communications satellite, at least one ground station and at least one handset.
- So-called satellite telephones are set up to maintain connections with other telephone subscribers via a communications satellite, whereby there must be a line-of-sight connection between the handset, ie the satellite telephone, and the satellite Applying high frequencies, which are between 1.5 and 2 GHz or higher, as well as the extremely low reception powers are already walls, trees, foliage, etc. insurmountable obstacles, so that the user can only make calls outdoors or at the window when this and thus its antenna is in the right direction.
- the invention is based on a method of the type mentioned at the outset, in which it is provided according to the invention that specific information to be transmitted to the mobile part is transmitted from the satellite or its ground station to at least one terrestrial long-wave transmitter and from this is broadcast on long wave, the radio coverage area of the satellite and that of the long wave transmitter at least partially coinciding.
- the invention offers the advantage that minimal information regarding a call can be given to the handset even in the most unfavorable situations, e.g. reached in underground car parks and underground shafts.
- this information can contain the calling number of a calling subscriber, which is stored and displayed in the mobile part, so that the user of the satellite telephone puts the antenna in a “line-of-sight” position at the next opportunity and the number of the
- the long-wave transmitter will generally receive the information to be broadcast from the news satellite via its own satellite receiver and then broadcast it.
- the information is advantageously encoded in digital information blocks, it being possible to use error-correcting codes, such as a Reed-Solomon code, BCH code or convolutional code. It is expedient if, in addition to an identification, for example a telephone number, of the handset to be called, the information also contains an identification, for example a telephone number, of the calling subscriber and, if appropriate, brief information for the called subscriber. With the help of these two pieces of information, on the one hand, a selection can be made regarding the handset to be called, and on the other hand, this handset can receive the message regarding the calling subscriber.
- error-correcting codes such as a Reed-Solomon code, BCH code or convolutional code.
- a further improvement results if the information contains location information relating to the geographical location of the handset. This also makes it possible to select the mobile parts, a further variant providing that the location information is used to activate a long-wave transmitter in the coverage area of which the communicated geographical position of the mobile part is located. This allows a certain frequency economy to be achieved when using multiple long-wave transmitters.
- the values relating to the location information are entered on the handset and are transmitted to the system when a connection between the satellite and the handset occurs, the user being able to enter, for example, the name of the closest city or else geographical coordinates.
- An improvement results if the values relating to the location information are determined in the handset with the aid of a GPS receiver, since the location information can be input at any time independently of the user.
- a further embodiment provides that the information contains block length information, but all information blocks can also have a predeterminable, identical length.
- the information about the block length is expedient because it enables a targeted suppression of data about the block length or part of the block length. For example, the data received from an information onsblockes are suppressed at least for the duration of a message field if the identification contained in it does not match that of the receiving handset.
- the long-wave transmitters may be advisable for the long-wave transmitters to transmit with periodic antenna diversity.
- Another possibility for improving the reception quality is that the long-wave transmitters transmit time-synchronized with one another in time-division multiplexing.
- CDMA Code division multiple access
- a long-wave transmitter only transmits when the called handset is registered or authorized in the system.
- the long-wave transmitter receives information about the called handset, for example via a satellite receiver or from the satellite receiver's ground station, it can be provided that a long-wave transmitter only transmits when the called handset is registered in the system or is authorized to use the call via long-wave transmitter .
- This authorization is communicated in the call log and is in the Satellite radio network known subscriber-oriented, for example contained in the so-called SIM card.
- the long-wave transmitter does not send a call, which results in an additional frequency economy.
- the problem is also solved in a satellite telecommunication system of the type mentioned at the beginning, in which at least one terrestrial long-wave transmitter is provided, the long-wave transmitter is assigned a connection to the satellite or the ground station, and the mobile part also has a long-wave receiver, wherein the system is set up to send out specific information for the handset via the long-wave transmitter.
- a satellite receiver which is located in the radio coverage area of the satellite can expediently be assigned to the long-wave transmitter.
- the long-wave transmitter can of course also obtain its information from a satellite ground station, i.e. preserved without the detour earth - satellite - earth.
- FIG. 1 schematically shows a satellite telecommunication system with a satellite mobile part and two long-wave transmitters
- Fig. 2 shows the basic structure of a message block
- FIG. 3 shows a simplified mobile block diagram of a satellite mobile part of the telecommunications system according to the invention.
- Fig. 1 shows a communications satellite SAT, a satellite handset or radio telephone SPP and a ground station BST, which is assigned to the communications satellite SAT and with at least one communications network NET, e.g. a telephone network that is connected.
- a first long-wave transmitter LWS with a long-wave antenna LWA is also provided, the long-wave transmitter LWS receiving information from a satellite receiver SRE, which the satellite receiver receives from the satellite SAT.
- Another long-wave transmitter LWS ' is shown, with a long-wave antenna LWA' and a satellite receiver SRE '.
- a satellite mobile part SPP essentially has an HF part HFT which is connected to an antenna, for example a parabolic antenna PAN.
- the handset SPP also contains a digital signal processor TSP and an audio unit AUD, which has, for example, a telephone handset THO connection.
- An essential component of the handset is a long-wave receiver LWE, which is equipped, for example, with two ferrite antennas FA1 and FA2, which are at right angles to one another in order to avoid directional dependence.
- the SPP handset also contains a GPS receiver GPS with an associated antenna GAN.
- an input device OEI is also provided, for example so-called dip switches, via which location information can be entered, for example.
- a conventional keypad can also be pulled out.
- the long-wave receiver is formed a single channel and may then receive a narrow-band generally has a frequency in the long wave range, wherein, 'a shaft is area to be understood here under long wave, regardless of other definitions, in which the propagation conditions already mentioned are present, ie the receiver can be reached even when covered, for example by heavy walls.
- the corresponding frequency is expediently chosen below or above the common long-wave broadcasting range (148.5 to 255 kHz), it being known that the depth of penetration increases with increasing wavelength.
- the invention now provides for specific information INF to be transmitted to the mobile part SPP, which is important if the antenna PAN of the mobile part SPP is not oriented towards the satellite SAT in the sense of a “line-of-sight” connection or if there are obstacles between the antenna PAN and the satellite SAT which prevent radio transmission in the corresponding satellite band, for example in the range of 2 GHz, such information is now emitted by a long-wave transmitter LWS via a corresponding long-wave antenna LWA, provided that The SPP handset is in the coverage area of the LWS long-wave transmitter or within its range the handset SPP to be transmitted information INF the satellite receiver SRE from the satellite SAT. In order to avoid the up-down radio link, the LWS long-wave transmitter can also provide the relevant information at least the ground station BST of the satellite SAT (or a ground station).
- the information INF to be transmitted is in the form of digital blocks, FIG. 2 schematically showing such a block BLO which contains the information INF or part of this information INF.
- the block can have a predetermined bit length and first contain location information OIN, then block length information BIN, furthermore an identification IDE of the subscriber to be called and finally a message field NAF.
- an identification IDS regarding the calling subscriber e.g. its number, as well as a short message to the called party, e.g. "Call from 7pm".
- the long-wave receiver LWE of the SPP handset is constantly switched on, ie ready to receive. If the line-of-sight position between the antenna PAN and the satellite SAT is maintained in the event of a call, the connection is established directly via satellite radio and the information INF broadcast by the long-wave transmitter LWS is ignored by the SPP handset or However, if there is no radio connection to the satellite SAT, the call request is received via long-wave radio, and the telephone number of the caller, ie the identification IDS, is stored in the block BLO display the call request, so that the user then puts the device in a "line-of-sight" position, for example outdoors or
- the range of long-wave transmitters is practically spanning the earth, especially at low frequencies and sufficient transmission power, but it is advisable to use several long-wave transmitters, each covering a certain range, in order to avoid excessive transmission powers. It is technically simple if all the long-wave transmitters work on the same frequency, since this means that the long-wave receivers LWE only have to work on one channel. However, fading occurs in the overlap area of the individual long-wave transmitters with the same field strength.
- each block of information is sent out several times, at least once per antenna configuration.
- the long-wave receivers LWE contain a frequency scanner in the SPP mobile parts in order to find the cheapest long-wave transmitter in each case.
- the receiver can search for a transmitter that is incident with the greatest field strength and / or that has the appropriate bit error rate.
- the use of several frequencies in the long-wave range can lead to problems, since naturally only a limited number of channels can be accommodated in a specific long-wave range.
- CDMA code multiplex method
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE59804323T DE59804323D1 (en) | 1997-03-14 | 1998-03-10 | METHOD FOR TRANSMITTING INFORMATION TO A MOBILE DEVICE OF A SATELLITE TELECOMMUNICATION SYSTEM |
JP10540020A JP2000513173A (en) | 1997-03-14 | 1998-03-10 | Method for transmitting information to a mobile station in a satellite communication system |
EP98921346A EP0966851B1 (en) | 1997-03-14 | 1998-03-10 | Method for transmitting information to a mobile part of a satellite telecommunications system |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19710748 | 1997-03-14 | ||
DE19710748.6 | 1997-03-14 | ||
DE19742356.6 | 1997-09-25 | ||
DE19742356 | 1997-09-25 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1998042087A2 true WO1998042087A2 (en) | 1998-09-24 |
WO1998042087A3 WO1998042087A3 (en) | 1999-02-11 |
Family
ID=26034876
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1998/000704 WO1998042087A2 (en) | 1997-03-14 | 1998-03-10 | Method for transmitting information to a mobile part of a satellite telecommunications system |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0966851B1 (en) |
JP (1) | JP2000513173A (en) |
CN (1) | CN1256052A (en) |
DE (1) | DE59804323D1 (en) |
WO (1) | WO1998042087A2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002035733A1 (en) * | 2000-10-24 | 2002-05-02 | Adzhalov Vladimir Isfandeyarov | Method for building up a wireless system for accessing communication networks |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3570374B1 (en) | 2004-06-23 | 2022-04-20 | pSemi Corporation | Integrated rf front end |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0177971A2 (en) * | 1984-10-12 | 1986-04-16 | Nec Corporation | Pager receiver capable of controlling an internal state by a call signal |
EP0680024A1 (en) * | 1994-04-28 | 1995-11-02 | Nec Corporation | Radio selective calling receiver |
DE4417562A1 (en) * | 1994-05-19 | 1995-11-23 | Meyer Baese Uwe Dipl Ing | Paging system with long and/or medium wave transmitters |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2276061A (en) * | 1993-03-11 | 1994-09-14 | Michael Victor Rodrigues | Satellite mobile radio telephone apparatus |
JP3658628B2 (en) * | 1995-04-07 | 2005-06-08 | カシオ計算機株式会社 | Message data transmission / reception system, message data transmission device, and message data transmission method |
DE29600600U1 (en) * | 1996-01-16 | 1996-06-05 | Ct Communication Technology Gm | Device for the transmission of geographic coordinates via mobile phones |
-
1998
- 1998-03-10 WO PCT/DE1998/000704 patent/WO1998042087A2/en active IP Right Grant
- 1998-03-10 CN CN98805121A patent/CN1256052A/en active Pending
- 1998-03-10 JP JP10540020A patent/JP2000513173A/en not_active Ceased
- 1998-03-10 EP EP98921346A patent/EP0966851B1/en not_active Expired - Lifetime
- 1998-03-10 DE DE59804323T patent/DE59804323D1/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0177971A2 (en) * | 1984-10-12 | 1986-04-16 | Nec Corporation | Pager receiver capable of controlling an internal state by a call signal |
EP0680024A1 (en) * | 1994-04-28 | 1995-11-02 | Nec Corporation | Radio selective calling receiver |
DE4417562A1 (en) * | 1994-05-19 | 1995-11-23 | Meyer Baese Uwe Dipl Ing | Paging system with long and/or medium wave transmitters |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 97, no. 2, 28. Februar 1997 & JP 08 280052 A (CASIO COMPUT CO. LTD.), 22. Oktober 1996 * |
See also references of EP0966851A2 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002035733A1 (en) * | 2000-10-24 | 2002-05-02 | Adzhalov Vladimir Isfandeyarov | Method for building up a wireless system for accessing communication networks |
Also Published As
Publication number | Publication date |
---|---|
CN1256052A (en) | 2000-06-07 |
EP0966851B1 (en) | 2002-06-05 |
EP0966851A2 (en) | 1999-12-29 |
WO1998042087A3 (en) | 1999-02-11 |
JP2000513173A (en) | 2000-10-03 |
DE59804323D1 (en) | 2002-07-11 |
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