GB2317536A - Mobile satellite communication system - Google Patents
Mobile satellite communication system Download PDFInfo
- Publication number
- GB2317536A GB2317536A GB9721234A GB9721234A GB2317536A GB 2317536 A GB2317536 A GB 2317536A GB 9721234 A GB9721234 A GB 9721234A GB 9721234 A GB9721234 A GB 9721234A GB 2317536 A GB2317536 A GB 2317536A
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- Prior art keywords
- terrestrial
- mobile
- zone
- communication
- location
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Classifications
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- 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
- H04B7/18545—Arrangements for managing station mobility, i.e. for station registration or localisation
- H04B7/18547—Arrangements for managing station mobility, i.e. for station registration or localisation for geolocalisation of a station
- H04B7/1855—Arrangements for managing station mobility, i.e. for station registration or localisation for geolocalisation of a station using a telephonic control signal, e.g. propagation delay variation, Doppler frequency variation, power variation, beam identification
- H04B7/18552—Arrangements for managing station mobility, i.e. for station registration or localisation for geolocalisation of a station using a telephonic control signal, e.g. propagation delay variation, Doppler frequency variation, power variation, beam identification using a telephonic control signal and a second ranging satellite
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/02—Details of the space or ground control segments
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
- G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/42—Determining position
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/14—Determining absolute distances from a plurality of spaced points of known location
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- Aviation & Aerospace Engineering (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The present invention relates to a mobile satellite communication system. It is the object of the invention to provide a mobile satellite communication system capable of monitoring a location of a mobile station by data on its absolute location on the ground L, in lieu of relative monitoring thereof with respect to satellite base stations, to thereby ensure an effective location registration and suppress an increase of traffic in communication lines arising from location registrations. The satellite base stations are each equipped with a navigation signal generator for issuing navigation signals. The mobile station detects its absolute location on the ground L based on the navigation signals received from the satellite base stations, and executes its location registration procedure by use of identification data (communication zone ID) associated with the communication zone in which it lies and which is determined by the thus detected absolute location data.
Description
MOBILE SATELLITE COMMUNICATION SYSTEM BACKGROUND OF THE INVENTION
Field of the Invention The present invention relates to a mobile satellite communication system and, more particularly, to a process of location registration for allowing a monitor section of the system to access location data of a mobile station which may be used for monitoring the mobile station.
Description of the Related Arts
Referring first to Fig.l, there is shown a configuration of a conventional mobile satellite communication system using low orbit satellites. In the diagram, reference numeral 50 generally designates a conventional mobile satellite communication system using the low orbit satellites. The system 50 comprises a mobile station 1 able to move on the ground L and executing a location registration for informing a system monitor section of its location so as to be monitored based on the location registration data. The system 50 further comprises a plurality of satellite base stations 2a to 2c each moving along its orbit round the Earth and capable of communicating with the mobile station now being located within its service area (hereinafter, referred to also as control cell), and a plurality of earth switching centres 3 placed on the ground and constituting a communication network in cooperation with the satellite base stations 2a to 2c.
In the conventional mobile satellite communication system 50, the location registration is effected be means of base station ID's which are assigned to the satellite base stations 2a to 2c, that is, identification data on the satellite base station. More specifically, using the base station ID's, the mobile station 1 informs a system monitor section (not shown) of which one of a plurality of control cells 4 associated with the satellite base stations the mobile station 1 lies in.
Referring next to Fig. 2, there is shown a functional block diagram of a mobile station, a satellite base station, and an earth switching centre, which constitute the mobile satellite communication system. As a fundamental arrangement of a radio equipment, the mobile station 1 includes a transmitter/receiver section 12 having an antenna 11 connected thereto, and a communication control means 13 for controlling signals to be transmitted or received. Further, as the measures of effecting the location registration, the mobile station 1 includes a base station ID memory means 15, a comparison/update means 14, and a location registration means 16.
The memory means 15 stores, as its location data, a base station ID of the satellite base station. The comparison/update means 14 compares the base station ID being stored with the base station ID derived from the satellite base station being in communication therewith, and if they are different from each other, updates the base station ID within the memory means 15 into a base station ID of the satellite base station. The location registration means 16 receives a comparison noncoincidence output from the comparison/update means 16, and transmits the mobile station ID to the transmitter/emitter section 12 by way of the communication control means 13.
The satellite base station 2a includes a transmitter/receiver section 22 having an antenna 21 connected thereto, a communication control means 23 for controlling the signals to be transmitted or received, and a base station ID output section 24 for outputting the base station ID signals serving as its identification data to the transmitter/receiver section 22. The earth switching centres 3 each include a transmitter/receiver section 32 having an antenna 31 connected thereto, a communication control means 33 for controlling the signals to be transmitted or received, and an arrangement not shown for transmitting or receiving signals with respect to the terrestrial telephone lines.
The action of the conventional system will be described hereinbelow. In this mobile satellite communication system 50, the mobile station 1, when energized, communicates with the satellite base station 2a managing the control cell 4 in which it lies. The mobile station 1 then compares the base station ID of the satellite base station 2a with the base station ID being stored within its base station 1D memory means 15. If noncoincident, the location registration means 16 outputs the mobile station ID signal to the transmitter/receiver section 12 by way of the communication control means 13. The transmitter/receiver section 12, upon receiving this output, transmits the mobile station ID to the satellite base station 2a. When the satellite base station 2a is allowed to receive the location data of the mobile station 1, the new location data associated with the satellite base station 2a is registered within the monitor section of the system over the communication network of the system. Thus, the location registration procedure is carried out.
Thereafter, in the receiving mode, the movement of the mobile station 1 on the earth and the movement of the satellite base station 2a along the orbit round the Earth may cause a change of the satellite base stations to serve the mobile station 1. When the base station ID received by the mobile station 1 differs from the base station ID being stored within the memory means 15 of the mobile station 1, the same.location registration procedure as the above is to be carried out.
In this manner, after energization of the mobile station 1, its location is constantly monitored by the monitor section of the system. For instance, when the mobile station 1 receives a call from a terrestrial telephone line (not shown), the monitor section of the system calls the mobile station 1 through the satellite base station 2a corresponding to the control cell in which the mobile station 1 lies at that time, over the cqmmunication network linking the earth switching centres 3 placed at various points on the ground with the satellite base stations 2a to 2c, to connect the terrestrial telephone line with the mobile station 1.
In this manner, the mobile satellite communication system 50 ensures that the mobile station 1 is connected to the terrestrial telephone lines irrespective of the terrestrial location of the mobile station 1.
It will be understood that although Fig. 1 depicts only three satellite base stations and a single earth switching centre for convenience of illustration, in the actual mobile satellite communication system, naturally, there will be provided more satellite base stations moving in orbit round the Earth sufficient to cover every area of the earth is surface, and the earth switching centres are placed on the ground all important points in terrestrial telephone lines.
In the conventional mobile satellite communication system 50, however, since the satellite base stations 2a to 2c are moving along the orbits round the Earth, the location of the mobile station varies relatively when viewed from the satellite base stations 2a to 2c, even though the mobile station 1 is stationary. Thus, the location registration procedure is required whenever the satellite base station is substituted with an other one, which will result in increased traffic for location registration.
According to the present invention, a mobile satellite communication system comprises a mobile station movable on the ground; a plurality of satellite base stations each moving along its orbit round the Earth and communicable with the mobile station located within its service area; said mobile stations including a registration means which detects a terrestrial communication zone in which it lies based on zone identification data from a switching centre of a terrestrial mobile communication system provided on each of terrestrial communication zones which are allocated in advance in the terrestrial mobile communication system, and which informs a system monitor section of a location in which it lies by use of its identification data.
According to another aspect of the present invention, a mobile satellite communication system comprises a mobile station movable on the ground; a plurality of satellite base stations each moving along its orbit round the Earth and communicable with said mobile station located within its service area; a plurality of earth switching centres placed on the ground and constituting a communication network in cooperation with said satellite base stations; said mobile stations including a memory means for storing, as its location data, one of identification data corresponding to terrestrial communication zones which are allocated in advance on the ground in said terrestrial mobile communication system; a zone detection means for detecting a terrestrial communication zone in which it lies, based on zone identification data from a switching centre -said terrestrial mobile communication system provided on each of said terrestrial communication zones; a location registration means which, if detected communication zone is not coincident with the terrestrial communication zone associated with the identification data now being stored, updates said identification data being stored into the identification data corresponding to said detected terrestrial communication zone.
According to yet another aspect of the present invention, a location registration method for registering data on the location of a mobile station into a monitor section of a mobile satellite communication system, comprising the step of causing said mobile station to detect a terrestrial communication zone in which it lies based on signals from a switching centre provided on each of terrestrial communication zones which are allocated in advance on the ground in a terrestrial mobile communication system; and registering its location into said monitor section by use of identification data associated with detected communication zone.
BRIEF nFSCRTPrlON t)F vE DRAWINGS Fig. 1 is a diagrammatic view showing a configuration of a conventional mobile satellite communication system;
Fig. 2 is a diagram showing a functional block of a mobile station, a satellite base station, and an earth switching centre, which constitute the conventional mobile satellite communication system;
Fig. 3 is diagrammatic view showing a configuration of a mobile satellite communication system in accordance with a first embodiment of the present invention;
Fig. 4 is a diagram showing a functional block of a mobile station, a satellite base station, and an earth switching centre, which constitute the mobile satellite communication system of Fig. 3;
Fig. 5 is a diagrammatic view showing a configuration of a mobile satellite communication system in accordance with a second embodiment of the present invention;
Fig. 6 is a diagram showing a functional block of a mobile station, a satellite base station, and an earth switching centre, which constitute the mobile satellite communication system of Fig. 5;
Fig. 7 is a diagrammatic view showing a configuration of a mobile satellite communication system in accordance with a third embodiment of the present invention;
Fig. 8 is a diagram showing a functional block of a mobile station, a satellite base station, and an earth switching centre, which constitute the mobile satellite communication system of Fig. 7;
Fig. 9 is a diagrammatic view showing a configuration of a mobile satellite communication system in accordance with a fourth embodiment of the present invention;
Fig. 10 is a diagram showing a functional block of a mobile station, a satellite base station, and an earth switching centre, which constitute the mobile satellite communication system of Fig. 9; nsSCRTPvTON Ow THE PREFERRED sMROnTMwNTS Embodiment 1
Fig. 3 is a diagram showing a configuration of a mobile satellite communication system constructed and arranged in accordance with a first embodiment of the present invention, while Fig. 4 is a diagram showing a functional block of a mobile station, a satellite base station, and an earth switching centre, which constitute the mobile satellite communication system.
Referring first to Fig. 3, reference numeral 100 denotes a mobile satellite communication system of this embodiment, which comprises a mobile station 101, capable of moving on the ground L, a plurality of satellite base stations, 102a to 102c moving in an orbit round the Earth and communicable with the mobile station 101 located within their control area, and a plurality of earth switching centres 3 placed on the ground L and establishing a communication network in cooperation with the satellite base stations 102a to 102c. Based on its absolute terrestrial location data, the mobile station 101 passes a location registration to a monitor section (not shown) of this system 100. The monitor section is provided in the predetermined earth switching centres constituting the communication network so as to monitor the mobile station 101 moving on the ground L and the satellite base stations 102a to 102c moving along its orbit (not shown) round the Earth.
Referring next to Fig. 4, the satellite base stations 102a to 102c each includes a transmitter/receiver section 22, a communication control means 23, and a navigation signal generator (or a transmitting means) 124 for transmitting communication signals involving information on the absolute location in its orbit round the Earth, for example, navigation signals for use in GPS (Global Positioning System).
The mobile station 101 includes a transmitter/receiver section 12, a communication control means 13, a zone ID memory means 115, a location detection means 17, and a zone decision means 118. The zone ID memory means 115 stores, as information on the location of the mobile station 101, one of identification data (or communication zone ID's) corresponding to communication zones in this system 100 which are previously allotted to the ground. The location detection means 117 detects its absolute terrestrial location, based on communication signals transmitted from the three satellite base stations signals transmitted from the three satellite base stations 102a to 102c. The zone decision means 118 determines which one it lies in at present of all the communication zones of this system, based on an output from the location detection means 117.
The mobile station 101 further includes a comparison/update means 114 and a location registration means 116. The comparison/update means 114 compares the communication zone ID being stored with the communication zone ID transmitted from the satellite base station now in contact, and, if they do not coincide with each other, updates the communication zone ID within the memory means 115 into the communication zone ID from the satellite base station now being in communication therewith. The location registration means 116 receives a noncoincidence output from the comparison/update means 16, and transmits the communication zone ID derived from the communicating satellite base station to the transmitter/receiver section 12 by way of the communication control means 13. The other arrangement is substantially the same as that in the conventional mobile satellite communication system 50.
The action of this system will be described hereinbelow.
In this mobile satellite communication system 100, the mobile station 101 is first energized to initiate a communication with the satellite base station 102a covering a control cell 104 within which the mobile station 101 lies. At that time, the location detection means 117 detects its absolute terrestrial location based on the communication signals descending from the satellite base station 102a, while the zone
ID decision means 118 determines which one it lies in of all the communication zones of this system based on the output from the location detection means 117.
Then, in the comparison/update means 114, the ID associated with the thus determined communication zone is compared with the communication zone ID now being stored in the communication zone ID memory means 115. If they are not coincident with each other, the location registration means 116 receives a noncoincidence output, and issues a signal representing the determined communication zone ID with the mobile station ID to the transmitter/receiver section 12 over the communication control means 13. The transmitter/receiver section 12 in turn transmits the determined communication zone ID thus received, as location data update request with respect to the mobile station 101, to the satellite base station 102a.
When the satellite base station 102a receives data on the absolute location of the mobile station 101 in this manner, the absolute location data are registered within the monitor section of this system by way of the communication network of this system 100 for the execution of a location registration procedure.
Afterwards, in receiver mode, the mobile station 101 may be managed by other satellite base station, according to the movement of the satellite base station 101 on the ground and movements of the satellite base stations 102a to 102c along the orbit round the Earth. It is to be appreciated that the same location registration procedure as the above can be carried out only when the determined communication zone ID received by the mobile station 101 differs from the communication zone ID being stored within the memory means 115 of the mobile station 101.
Thus, after energizing the mobile station 100, its absolute terrestrial location is constantly monitored by the monitor section of this system.
For instance, when the mobile station 101 receives a call from a ground telephone line (not shown), the monitor section of this system calls the mobile station 101 by way of the satellite base station 102a corresponding to the control cell 4 in which the mobile station 101 is located at that time, over the communication network which links the earth switching centres 3 provided at various points on the earth with the satellite base stations 102a to 103c, thereby connecting the ground telephone line to the mobile station 101.
In this embodiment, as described above, the satellite base stations 102a to 102c are each equipped with the navigation signal generator 124. On the other hand, the mobile station 101 detects its absolute terrestrial location based on a navigation signal received from each of the satellite base station, and executes a location registration procedure by use of identification data (or communication zone ID) corresponding to the communication zone in which it lies, which zone is derived from the thus detected absolute location data. Thus, the monitoring on the location of the mobile station is carried out by means of the data associated with its absolute location, instead of relative positional relationship between the mobile station and the satellite base stations. In other words, the location registration is effected only when the mobile station 101 is moved from one communication zone to the other communication zone, thereby ensuring an effective execution of the location registration without causing any excessive increase in communication traffic.
Fig. 5 illustrates a configuration of a mobile satellite communication system in accordance with a second embodiment of the present invention, while Fig. 6 is a functional block diagram showing constituent elements of the mobile satellite communication system, that is, a mobile station, a satellite base station, and an earth switching centre, each being exemplarily shown independently. In the diagrams, a mobile satel lite communication system of the present invention generally designated at 200 comprises a mobile station 201, a plurality of satellite base station 202a, to 202c, and plurality of earth switching centres 3. In the same manner as the first embodiment, the mobile station 201 passes a location registration on a monitor section (not shown) based on its absolute terrestrial location data.
In addition to the arrangement of the mobile station 101 shown in the first embodiment, the mobile station 201 further includes a GPS receiver 212 intended to receive a radio wave from GPS system satellites 205a, 205b constituting a Global
Positioning System, the absolute terrestrial location of the mobile station 201 being detected based on the output from the
GPS receiver 212.
The GPS system satellite 205a includes an output means 53 for issuing a navigation signal, and a transmitter section 52 having an antenna 51 through which navigation signals are transmitted to the ground L. The satellite base station 202a has substantially the same configuration as that of the satellite base station 102a of the first embodiment, except that the navigation signal generator 124 is removed.
In lieu of allowing navigation signals to be contained within signals descending from the satellite base stations 102a to 102c as in the first embodiment, the mobile station 201 of the thus configured second embodiment further includes a receiver 212 for GPS, based on which output there is obtained an absolute terrestrial location data on the mobile station, thereby effecting its location registration into the monitor section of the system. Thus, as in the above, irrespective of a possible relative variation in positional relationships between the mobile station 201 and the satellite base stations 202a to 202c, the location registration procedure need be executed only when the mobile station itself moves on the ground. This also simplifies specifications of the communication facilities in the satellite base stations 202a to 202c, while leaving specifications of the communication facilities in the earth switching centres 3 intact, thus suppressing any excessive increase of the communication traffic in the communication line arising from frequent location registrations for the mobile station 201, without causing any complexity in the communication facilities in the satellite base stations and earth switching centres.
Emhodiment 3
Fig. 7 is a diagram showing a configuration of a mobile satellite communication system according to a third embodiment of the present invention. Fig. 8 is a diagram showing a functional block of a mobile station, a.satellite station, and an earth switching centre, which constitute in cooperation the mobile satellite communication system. It will be understood that each constituent element is shown individually for illustrative purpose only. In the diagrams, reference numeral 300 denotes a mobile satellite communication system of this embodiment which comprises a plurality of earth switching centres 303 individually corresponding to a plurality of communication zones in this system which are allotted in advance on the ground. Each of the earth switching centres includes not only a transmitter/receiver section 32 and a communication control means 33 but also a zone ID output section 331 for outputting identification data (or communication zone ID) associated with the communication zone ion which it lies.
In this embodiment, a communication control means 323 involved in a satellite base stations 202a is so adapted that when a service area following the satellite base station 202a falls into a predetermined communication zone, it transfers a communication zone ID received from the earth switching centre 303 which lies in the communication zone to the mobile station 301 located within the communication zone.
The mobile station 301 further includes a zone detection means 319 instead of the location detection means 117 and the zone ID decision means 118 employed in the mobile station 101 of the first embodiment, the zone detection means 319 detecting a communication zone in which it lies based on a communication ID signal from the earth switching centre 303, which is transferred from the satellite base station 202a. If the detected communication zone is different from the communication zone associated with the communication zone ID now being stored, the communication zone ID corresponding to the detected communication zone is used to perform the location registration, and the communication zone ID being stored is updated into the ID associated with the detected communication zone.
The action of this embodiment will be described hereinbelow.
In the mobile satellite communication system 300 of this embodiment, the earth switching centre 303 is provided for each of the zones of this system which are allotted in advance on the ground. When the service area of the satellite base station 202a falls into a predetermined communication zone, the satellite base station 202a receives a communication zone
ID issued from the earth switching centre 303 covering the predetermined communication zone and then transfers it to the mobile station 301 lying within the communication zone and then transfers it to the mobile station 301 lying within the communication zone.
Therefore, as in the above embodiment, irrespective of a relative variation in positional relationship between the satellite base stations and the mobile station, the location registration procedure is required only when the mobile station itself moves on the ground. In addition, since the satellite base station merely acts to transfer the communication zone ID received from the earth switching centre to the mobile station 301, the increase of the traffic in the communication line arising from frequent location registrations for the mobile station can be suppressed without largely changing the specifications of the communication facilities.
Embodlment 4 Fig. 9 depicts a configuration of a mobile satellites communication system according to a fourth embodiment of the present invention, while Fig. 10 is a functional block diagram showing a mobile station, satellite base station, and an earth switching centre, which constitute the mobile satellite communication system. In the diagrams, identical parts to those in ig. 6 are designated by similar reference numerals. A mobile satellites communication system generally designated at 400 comprises a mobile station 401, a plurality of satellite base stations 202a to 202c, and a plurality of earth switching entres. As in the first embodiment, a mobile station 401
Loads its location registration into a monitor section (not shown) of this system, based on its absolute terrestrial
Location data.
The mobile station 401 includes a terrestrial cellular ID nemory means 415 and a terrestrial cellular detection means 19. The memory means 415 stores, as its location data, one f identification data (terrestrial cellular ID) corresponding to terrestrial communication zones (terrestrial cellulars) 06a, 406b which are previously allotted on the ground in the terrestrial mobile communication system. The detection means 19 detects the terrestrial communication zone in which it
Lies, based on the zone identification data received from earth switching centres 431 of the terrestrial mobile communiration system which are provided correspondingly to the terrestrial communication zones.
rhe mobile station 401 further includes a comparison/update neans 414 and a location registration means 416. The compari ;on/update means 414 compares the thus detected terrestrial ommunication zone ID with the terrestrial communication zone D now being stored, and, if they are not coincident, updates the terrestrial communication zone ID within the memory means X15 into the detected terrestrial communication zone ID. The
Location registration means 416 receives a comparison noncoin cidence output from the comparison/update means 414, and transmits the detected terrestrial communication zone ID to the transmitter/receiver section 12 by way of the communication control means 13.
The switching centre 403a of the terrestrial cellular system includes transmitter/receiver section 432 connected to an antenna 431, a communication control means 433 fro controlling the signal transmitted and received through this switching centre, and an output transmitter/receiving section 432 by way of the communication control means 433.
In the thus configured fourth embodiment, the mobile satellite communication system is utilized in cooperation with the terrestrial mobile communication system so that its location registration is loaded into the monitor section of this mobile satellite communication system by means of the terrestrial cellular ID received from the terrestrial switching centres 403a, 403b of the terrestrial mobile communication system which are provided correspondingly to the terrestrial communication zones, thus preventing the increasing of the traffic in the communication line arising from the frequent location registrations for the mobile stations without requiring any change in specifications of the communication facilities of the satellite base station or the terrestrial base stations.
The communication zone ID of the terrestrial system may be regarded as the communication ID in the mobile satellite communication system 400 to perform the location management.
This enables a simultaneous location registration to be car ried out in the mobile satellite communication system by executing the location registration for the mobile station 401 within the terrestrial system.
Claims (9)
1. A mobile satellite communication system comprising:
(a) a mobile station movable on the ground; and
(b) a plurality of satellite base stations each moving along its orbit round the Earth and communicable with said mobile station located within its service area;
said mobile stations including:
(c) a registration means which detects a terrestrial communication zone in which it lies based on zone identification data from a switching centre of a terrestrial mobile communication system provided on each of terrestrial communication zones which are allocated in advance in the terrestrial mobile communication system, and which informs a system monitor section of a location in which it lies by use of its identification data.
2. A mobile satellite communication system according to Claim 1, wherein
said terrestrial mobile communication system is a cellular system.
3. A mobile satellite communication system according to Claim 1, wherein
said mobile station further comprises:
(d) a memory means for storing, as its location data, one of identification data corresponding to terrestrial communication zones which are allocated in advance on the ground in said terrestrial mobile communication system;
(e) a zone detection means for detecting a terrestrial communication zone in which it lies, based on zone identification data from a switching centre of said terrestrial mobile communication system provided on each of said terrestrial communication zones; and
(f) a location registration means which, if the detected terrestrial communication zone is not coincident with the terrestrial communication zone associated with the identification data now being stored loads into a system monitor section a location registration for permitting its location to be accessed, by use of the identification data corresponding to said detected terrestrial communication zone.
4. A mobile satellite communication system according to Claim 3, wherein
said mobile station further comprises:
(g) an update means which, if the detected terrestrial communication zone is not coincident with the terrestrial communication zone associated with the identification data now being stored, updates said identification data being stored into the identification data corresponding to said detected terrestrial communication zone.
5. A mobile satellite communication system comprising:
(a) a mobile station movable on the ground;
(b) a plurality of satellite base stations each moving along its orbit round the Earth and communicable with said mobile station located within its service area; and
(c) a plurality of earth switching centres placed on the ground and constituting a communication network in cooperation with said satellite base stations;
said mobile stations including:
(d) a memory means for storing, as its location data, one of identification data corresponding to terrestrial communication zones which are allocated in advance on the ground in said terrestrial mobile communication system;
(e) a zone detection means for detecting a terrestrial communication zone in which it lies, based on zone identification data from a switching centre of said terrestrial mobile communication system provided on each of said terrestrial communication zones;
(f) a location registration means which, if the detected communication zone is not coincident with the terrestrial communication zone associated with the identification data being now stored, loads into a system monitor section a location registration for permitting its location to be accessed, by use of the identification data corresponding to said detected terrestrial communication zone; and
(g) an update means which, if the detected terrestrial communication zone is not coincident with the terrestrial communication zone associated with the identification data now being stored, updates said identification data being stored in the identification data corresponding to said detected terrestrial communication zone.
6. A location registration method for registering data on the location of a mobile station into a monitor section of a mobile satellite communication system, comprising the steps of:
(a) causing said mobile station to detect the terrestrial communication zone in which it lies based on signals from a switching centre provided on each of terrestrial communication zones which are allocated in advance on the ground in a terrestrial mobile communication system; and
(b) registering its location into said monitor section by use of identification data associated with detected communication zone.
7. A location registration method according to Claim 6, wherein said terrestrial mobile communication system in said step
(a) is a cellular system.
8. A location registration method according to Claim 7, said steps (b) includes the step of: (bl) comparing its terrestrial communication zone being previously stored; and
(b2) if said detected terrestrial communication zone is different from said stored terrestrial communication zone, registering its location into said monitor section by use of identification data associated with said detected terrestrial communication zone.
9. A location registration method according to Claim 8 wherein said step (b) further includes the step of:
(b3) updating said stored terrestrial communication zone into said detected terrestrial communication zone.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5167650A JP2997610B2 (en) | 1993-07-07 | 1993-07-07 | Mobile satellite communication system |
| GB9411461A GB2279842B (en) | 1993-07-07 | 1994-06-08 | Mobile satellite communication system |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9721234D0 GB9721234D0 (en) | 1997-12-03 |
| GB2317536A true GB2317536A (en) | 1998-03-25 |
| GB2317536B GB2317536B (en) | 1998-07-29 |
Family
ID=26305018
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9721234A Expired - Fee Related GB2317536B (en) | 1993-07-07 | 1994-06-08 | Mobile satellite communication system |
| GB9804540A Expired - Fee Related GB2320154B (en) | 1993-07-07 | 1994-06-08 | Mobile satellite communication system |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9804540A Expired - Fee Related GB2320154B (en) | 1993-07-07 | 1994-06-08 | Mobile satellite communication system |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB2317536B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999057821A1 (en) * | 1998-05-01 | 1999-11-11 | Ericsson, Inc. | Methods for determining registration at a satellite communications system and related user terminals and systems |
| WO2000030058A1 (en) * | 1998-11-16 | 2000-05-25 | Haiwool Co., Ltd. | Traffic data collecting method and apparatus using gps device and speed data processing method based on vehicle-collected traffic information |
| WO2000058748A1 (en) * | 1999-03-29 | 2000-10-05 | Ericsson, Inc. | Systems and methods for resolving gps pseudo-range ambiguity |
| CN100411490C (en) * | 2006-06-27 | 2008-08-13 | 重庆邮电大学 | Method for mixed positioning AOA/TOA and GPS of TD-SCDMA network |
| CN109921841A (en) * | 2018-12-29 | 2019-06-21 | 顺丰科技有限公司 | The unmanned plane means of communication and system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0601293A2 (en) * | 1992-12-07 | 1994-06-15 | Motorola, Inc. | Intelligent position tracking |
| GB2275588A (en) * | 1993-02-10 | 1994-08-31 | Kokusai Denshin Denwa Co Ltd | Registering the location of a mobile terminal for communication via non- geosynchronous satellites |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5289527A (en) * | 1991-09-20 | 1994-02-22 | Qualcomm Incorporated | Mobile communications device registration method |
| US5235633A (en) * | 1991-12-26 | 1993-08-10 | Everett Dennison | Cellular telephone system that uses position of a mobile unit to make call management decisions |
| GB2271486B (en) * | 1992-10-07 | 1997-04-16 | Motorola Ltd | A communication system |
-
1994
- 1994-06-08 GB GB9721234A patent/GB2317536B/en not_active Expired - Fee Related
- 1994-06-08 GB GB9804540A patent/GB2320154B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0601293A2 (en) * | 1992-12-07 | 1994-06-15 | Motorola, Inc. | Intelligent position tracking |
| GB2275588A (en) * | 1993-02-10 | 1994-08-31 | Kokusai Denshin Denwa Co Ltd | Registering the location of a mobile terminal for communication via non- geosynchronous satellites |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999057821A1 (en) * | 1998-05-01 | 1999-11-11 | Ericsson, Inc. | Methods for determining registration at a satellite communications system and related user terminals and systems |
| AU749045B2 (en) * | 1998-05-01 | 2002-06-20 | Ericsson Inc. | Methods for determining registration at a satellite communications system and related user terminals and systems |
| US6418314B2 (en) | 1998-05-01 | 2002-07-09 | Ericsson Inc. | Methods for determining registration at a satellite communications system and related user terminals and systems |
| WO2000030058A1 (en) * | 1998-11-16 | 2000-05-25 | Haiwool Co., Ltd. | Traffic data collecting method and apparatus using gps device and speed data processing method based on vehicle-collected traffic information |
| WO2000058748A1 (en) * | 1999-03-29 | 2000-10-05 | Ericsson, Inc. | Systems and methods for resolving gps pseudo-range ambiguity |
| US6408178B1 (en) | 1999-03-29 | 2002-06-18 | Ericsson Inc. | Systems and methods for resolving GPS pseudo-range ambiguity |
| CN100411490C (en) * | 2006-06-27 | 2008-08-13 | 重庆邮电大学 | Method for mixed positioning AOA/TOA and GPS of TD-SCDMA network |
| CN109921841A (en) * | 2018-12-29 | 2019-06-21 | 顺丰科技有限公司 | The unmanned plane means of communication and system |
| CN109921841B (en) * | 2018-12-29 | 2021-06-25 | 顺丰科技有限公司 | Unmanned aerial vehicle communication method and system |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2317536B (en) | 1998-07-29 |
| GB9804540D0 (en) | 1998-04-29 |
| GB9721234D0 (en) | 1997-12-03 |
| GB2320154B (en) | 1998-07-29 |
| GB2320154A (en) | 1998-06-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20070608 |