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WO2001018995A2 - Procedes, terminaux d'usagers, et systemes qui acheminent des appels internationaux dans un systeme de communications par satellite en utilisant une passerelle de communication domestique - Google Patents

Procedes, terminaux d'usagers, et systemes qui acheminent des appels internationaux dans un systeme de communications par satellite en utilisant une passerelle de communication domestique Download PDF

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Publication number
WO2001018995A2
WO2001018995A2 PCT/US2000/022541 US0022541W WO0118995A2 WO 2001018995 A2 WO2001018995 A2 WO 2001018995A2 US 0022541 W US0022541 W US 0022541W WO 0118995 A2 WO0118995 A2 WO 0118995A2
Authority
WO
WIPO (PCT)
Prior art keywords
user terminal
geographic region
call
destination
communications network
Prior art date
Application number
PCT/US2000/022541
Other languages
English (en)
Other versions
WO2001018995A3 (fr
Inventor
Javor Kolev
Jasen Kolev
Torbjorn Solve
Original Assignee
Ericsson Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ericsson Inc filed Critical Ericsson Inc
Priority to AU69116/00A priority Critical patent/AU6911600A/en
Publication of WO2001018995A2 publication Critical patent/WO2001018995A2/fr
Publication of WO2001018995A3 publication Critical patent/WO2001018995A3/fr

Links

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
    • H04B7/18558—Arrangements for managing communications, i.e. for setting up, maintaining or releasing a call between stations
    • H04B7/1856—Arrangements for managing communications, i.e. for setting up, maintaining or releasing a call between stations for call routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/64—Distributing or queueing
    • H04Q3/66—Traffic distributors
    • 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
    • H04B7/18563—Arrangements for interconnecting multiple systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13138—Least cost routing, LCR
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13141—Hunting for free outlet, circuit or channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13333—Earth satellites

Definitions

  • the present invention relates to the field of communications in general, and more particularly, to satellite radiotelephone communications.
  • Satellite radiotelephone commumcations systems are widely used to provide radiotelephone communications among satellite radiotelephones and with cellular and conventional wired telephones.
  • Some satellite communications systems provide service to multiple geographic regions, such as countries, so that users can place and receive telephone calls using a user terminal that operates in the satellite communications system.
  • the user terminal is registered as a subscriber of the satellite communications system through a communications network in a country served by the satellite communications system which may be referred to as the home country of the user terminal.
  • the user terminal subscription can allow the user terminal to receive service from the satellite communications system.
  • the user terminal may be used to make local or international telephone calls from the countries served by the satellite communications system.
  • the calls can be routed in the satellite communications system based on whether the calls are local calls or international calls. In particular, local calls can be routed to the home country and international calls may be routed to the destination using information provided by the user terminal.
  • FIG. 1 is a block diagram of a conventional satellite communications system 101.
  • a user terminal 100 operates as a subscriber to the satellite communications system 101 through a communications network 125 in a home country 121.
  • the satellite communications system 101 uses a control channel 110 which can carry information related to calls placed from the user terminal 100 to a local destination in the home country 121 or an international destination in a foreign country 122.
  • the user terminal 100 transmits signals over the control channel 110 to a satellite 105 which relays the information to a control center 115 over the control channel 110.
  • the control center 115 determines how to route the call initiated by the user terminal 100 to the destination based on the information received by the control center 115 from the user terminal 100 over the control channel 110.
  • the user terminal 100 When the user terminal 100 initiates a local call, the user terminal 100 transmits a call type that identifies the call as local, (i.e., non-international) call, and a Home Public Mobile Network (HPMN) code over the control channel 110.
  • the HPMN can identify the communications network 125 through which the user terminal 100 subscribes to the satellite communications system 101.
  • the communications network 125 can, in-turn, be used to identify a home gateway 120 in the home country 121 of the user terminal 100. For example, a call by the user terminal 100 to a destination in the home country 121 of the user terminal 100 may be routed to the home gateway 120 in the home country 121 which routes the call to the destination in the home country 121.
  • the user terminal 100 initiates an international call, the user terminal
  • a call type that identifies the call as international and destination information, such as a portion of the digits dialed by the user, which can be used to identify the foreign country in which the destination is located, and in-turn, can be used to identify the foreign gateway 130 in the foreign country 122.
  • an international call by the user terminal 100 to a destination in the foreign country 122 may be routed to the foreign gateway 130 in the foreign country 122 by the control center 115.
  • the control center 115 can route the international call to a gateway in the country served by the satellite communications system that is closest to the international destination. For example, an international call by the user terminal 100 to a destination other than the home country 121 or the foreign country 122 can be routed to the foreign gateway 130 in the foreign country 122 if the control center determines that the foreign country 130 is closest to the international destination of the call.
  • the foreign gateway 130 routes the call to the international destination, for example, over land lines.
  • OCR Optimal Call Routing
  • ⁇ reduce the degree of control which may be exercised over subscribers calling international destinations.
  • the control center 115 routes international calls to the country served by the satellite communications system 101 which is closest to the international destination. Consequently, it may be difficult for the operator of the communications network 125 to be aware of calls by their subscribers to international destinations.
  • the satellite communications system can, therefore, route international destination calls via the home country (i.e., as local calls) rather than via the country which is closest to the international destination, such as when Optimal Call Routing (OCR) is used. Accordingly, greater awareness and control may be maintained over international calls by subscribers to some communications networks.
  • OCR Optimal Call Routing
  • a signal is transmitted to the satellite communications system from the user terminal in the first geographic region in response to initiating a call from the user terminal to the destination.
  • the signal includes information that identifies the call type as non-international and the communications network with which the user terminal is associated in the third geographic region.
  • the call is routed from the user terminal in the first geographic region to a communications gateway in the third geographic region, wherein the communications gateway is associated with the communications network in the third geographic region with which the user terminal subscription is associated.
  • the call is routed from the communications gateway in the third geographic region to the destination in the second geographic region.
  • a user terminal may provide the information needed by the satellite communications system to route international calls as local calls. Consequently, the user terminals may be configured to disable optimal call routing when the user terminal is provided to the user.
  • a signal is transmitted to the satellite communications system from the user terminal in the first geographic region in response to initiating a call from the user terminal to the destination in the second geographic region.
  • the signal includes communications network information that identifies the type of the call and the communications network with which the user terminal is associated in the third geographic region and destination information that identifies the destination of the call in the second geographic region.
  • the call is routed from the user terminal to a communications gateway in the third geographic region if the communications network information included in the signal corresponds to call routing information stored in the satellite communication system that indicates that calls by user terminals associated with subscriptions to the communications network in the third geographic region are routed via the third geographic region, wherein the communications gateway is associated with the communications network with which the user terminal subscription is associated.
  • the call is routed from the user terminal to the destination in the second geographic region using the destination information included in the signal if the routing information stored in the satellite communication system indicates that calls by user terminals associated with subscriptions to the communications network in the third geographic region are not routed via the third geographic region. Therefore, a user terminal according to the present invention transmits communications information and destination information for both local and international destination calls.
  • Routing information available to the satellite communications system indicates whether OCR is enabled or disabled for particular subscribers to the satellite communications system. Accordingly, a control center can route calls by selected subscribers without OCR and route calls by other subscribers using OCR. Consequently, greater awareness and control may be maintained over international calls by subscribers to some communications networks.
  • the user terminal enables and disables optimal call routing in response to a disable signal received by transceiver from the satellite communications system.
  • FIG. 1 is a block diagram of a conventional satellite communications system.
  • FIG. 2 is a block diagram of a satellite communications system according to the present invention.
  • FIG. 3 A is a block diagram of a first embodiment of a user terminal shown in FIG. 2.
  • FIG. 3B is a block diagram that illustrates operations of a user terminal in satellite communications system of FIG. 2.
  • FIG. 4A is a block diagram of a second embodiment of a user terminal shown in FIG. 2.
  • FIG. 4B is a block diagram of an embodiment of a control center shown in FIG. 2.
  • FIG. 4C is a block diagram that illustrates operation of a satellite communication system according to the present invention.
  • FIG. 5 is a flowchart that illustrates operations of a user terminal shown in FIG. 3A.
  • FIG. 6 is a flowchart that illustrates operations of a user terminal and control center shown in FIGs. 4A and 4B respectively.
  • the present invention may be embodied as methods or devices. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects.
  • each block (of the flowcharts and block diagrams), and combinations of blocks, can be implemented by computer program instructions.
  • These program instructions may be provided to a processor(s) within the satellite communications system, user terminal, or control center such that the instructions which execute on the processor(s) create means for implementing the functions specified in the block or blocks.
  • the computer program instructions may be executed by the processor(s) to cause a series of operational steps to be performed by the processor(s) to produce a computer implemented process such that the instructions which execute on the processor(s) provide steps for implementing the functions specified in the block or blocks.
  • the blocks support combinations of means for performing the specified functions, combinations of steps for performing the specified functions and program instruction means for performing the specified functions. It will also be understood that each block, and combinations of blocks, can be implemented by special purpose hardware-based systems which perform the specified functions or steps, or combinations of special purpose hardware and computer instructions.
  • HPMN Home Public Mobile Network
  • a user terminal transmits subscription information, such as a Home Public Mobile Network code, to the satellite communications system when initiating both local and international destination calls.
  • FIG. 2 is a block diagram of a satellite communications system 201 that serves user terminals in a plurality of countries according to the present invention.
  • a user terminal 200 is a registered subscriber to the satellite communications system 201 through a communications network 225 in a first country 250 served by the satellite communications system 201.
  • the first country 250 is referred to as the home country 250 of the user terminal 200.
  • the user terminal 200 can place/receive calls to/from local or international destinations via the satellite communications system 201.
  • the user terminal 200 can place local calls to destinations in the home country 250.
  • the user terminal 200 can place international calls to other countries served by the satellite communications system 201 and to countries not served by the satellite communications system 201.
  • the user terminal 200 can call a destination in a first foreign country 255 or a second foreign country 260 served by the satellite communications system 201.
  • the user terminal 200 communicates with the satellite communications system 201 over a control channel 245 via a satellite 249 in the satellite communications system 201.
  • each of the plurality of countries served by the satellite communications system 201 can be accessed over the control channel 245 via a respective communications gateway for the country.
  • the satellite communications system 201 communicates with the home country 250 via a home communications gateway 210 and communicates with first and second foreign countries 255, 260 via first and second foreign commumcations gateways 215, 220 respectively.
  • a control channel can be defined by a frequency (FDMA), a frequency and a time slot (TDMA), and/or other techniques known in the art.
  • a control center 240 routes calls from the user terminal 200 to the destination of the call using information transmitted by the user termmal 200 to the control center 240 over the control channel 245 and information available to the control center 240.
  • the control center 240 stores information that associates the communications network to which user terminals subscribe with the communications gateway that provides access to the country in which the communications network is located.
  • the control center 240 stores information that associates the subscription of the user terminal 200 to the satellite communications system 201 through the communications network 225. Accordingly, the control center 240 can identify which communications gateways to route the call to based on the information transmitted by the user terminal 200 when the user terminal 200 initiates a call
  • FIG. 3A is a block diagram of an first embodiment of a user terminal 200 shown in FIG. 2.
  • the user terminal 200 includes a keypad 310 which can be used to provide input to the user terminal 200.
  • the keypad 310 includes a plurality of keys that provide input to the user terminal 200 when pushed.
  • the user when the user wishes to initiate a call in the satellite communications system 201, the user pushes a series of keys that correspond to the number to be dialed.
  • the user can speak into a microphone 345 which causes the user terminal 200 to generate communication signals which are transmitted from the user terminal 200.
  • the user may listen to a speaker 360 that produces audio signals generated by the user terminal 200 from communication signals received by the user terminal 200 during a call.
  • the user terminal 200 transmits and receives communication signals via a transceiver 340 over an antenna 359.
  • the user may refer to a display 256 of the user terminal 200 to observe information relevant to the operation of the user terminal 200, such as characters or numbers.
  • the display 256 can be a black and white Liquid Crystal Display (LCD) that displays for example, a telephone number entered by the user or a name stored in the user terminal 200.
  • the display 256 may also be used in conjunction with the keypad 310 such as when the user dials a number to place a call.
  • a processor 303 provides the communications signals to the transceiver 340 for transmission and receives the communications signals from the transceiver 340 for reception.
  • the processor 303 provides communications signals to the transceiver 340 when the user speaks into the microphone 345 and receives communications signals from the transceiver 340 for the reproduction of audio through the speaker 360.
  • the processor 303 can comprise an application specific integrated circuit, digital signal processor or general purpose computer that runs software to carry out instructions that correspond to the operation described herein.
  • a subscriber identify module 380 stores communications network information for the user terminal 200. For example, when the user terminal subscription to the communications network 225 is arranged, an International Mobile Subscriber Identifier (IMSI) can be stored in the subscriber identity module 380 in the user terminal 200. A portion of the IMSI can be used to provide a Home Public Mobile Network (HPMN) code that relates the user terminal 200 to the user terminal subscription to the satellite communications system 201 through the home communications network 225.
  • IMSI International Mobile Subscriber Identifier
  • HPMN Home Public Mobile Network
  • OCR information such as an enable bit
  • the OCR enable bit indicates if the user terminal 200 is to transmit the call type as non-international and the HPMN code stored on the subscriber identify module 380 as destination information over the control channel 245 when the user initiates an international call.
  • the processor 303 determines, based on the state of the OCR enable bit, that OCR is disabled, the processor configures the communications signal to include a call type that identifies the call as local and a Home Public Mobile Network (HPMN) code.
  • HPMN Home Public Mobile Network
  • the OCR information can be stored as a portion of a set of administrative data stored on the subscriber identify module 380 which, for example, can hold indications of special user terminal functions being either enabled or disabled. Alternately, the OCR information can be stored as part of a Satellite Service Profile Table which lists, for example, active subscriber services such as voice mail. Many other techniques of storing the OCR information in the user terminal may be envisioned by those of skill in the art.
  • the OCR information for the user terminal also can be stored by the satellite communications system and transmitted to the user terminal. Consequently, the control center 240 will route the international call initiated by the user terminal 200 as a local call, as shown in FIG. 3B, in response to the HPMN code included in the communications signal. According to FIG.
  • an international call is initiated by the user terminal 200 from the first foreign country 250 to an international destination 275 in a third foreign country 270 that is not served by the satellite communications system 201.
  • the processor 303 determines that OCR is disabled, whereupon processor 303 configures the commumcations signal to include a call type that identifies the call as local and the HPMN.
  • the user terminal 200 transmits the communications signal to the control center 240 over the control channel 245.
  • the control center 240 routes the international call to the home communications gateway 210 identified by the HPMN (as a local call) rather than to ⁇ the second foreign country 260 which is the closest country served by the satellite communications system 201 to the international destination 275.
  • the user terminal 200 After the call is routed to the home communications gateway 210, the user terminal 200 transmits the called party information, such as the complete number dialed by the user, to the home communications gateway 210.
  • the home communications gateway 210 routes the call as an international call to the international destination 275 over a landline 305. Accordingly, the present invention, can allow the operators of the communications network 225 to monitor or control the routing of international calls by subscribers to the communications network 225.
  • the user terminal 200 transmits the call type, the HPMN code described above, and destination information, such as a number of digits entered via the keypad 310, for both local and international calls.
  • the processor 303 configures the communications signal to include: call type, the destination information, and the HPMN for both local and international calls.
  • the control center 240 receives the call type, the HPMN code, and the destination information over the control channel 245 and routes the call to the appropriate gateway based on the HPMN code or the destination information depending on routing information associated with the user terminal 200 available locally to the control center 240.
  • the transceiver 305 receives the communications signal including the call type, the destination information and the HPMN. If the call is to an international destination, a processor 410 accesses a memory 400 that stores the OCR enable information. If the memory 400 includes an entry that indicates that OCR is disabled for user terminals having subscriptions to the satellite communications system 201 through the communications network associated with the HPMN received by the control center 240, the processor 410 routes the international call to the appropriate home communications gateway. For example, according to the second embodiment of the present invention, the processor 410 routes international calls from the user terminal 200 to home communications gateway 210 based on the HPMN received from the user terminal 200.
  • the processor 410 uses the destination information received by the control center 240 to determine the appropriate communications gateway to which the call should be routed. For example, referring to FIG. 4C, when a first user terminal 200a, for which OCR is enabled, initiates a call to the international destination 275, the control center 240 determines that OCR is not disabled for the user terminal 200a and uses the destination information to route the call to the second foreign communications gateway 220 in the second foreign country 260 which is the closest country in the satellite communications system 201 to the international destination 275. The second foreign communications gateway 220 routes the call to the international destination over first communication lines 450, e.g., landlines.
  • first communication lines 450 e.g., landlines.
  • the control center 240 determines that OCR is disabled for the user terminal 200b and routes the call to the home communications gateway 210 in the home country 250.
  • the home communications gateway 210 routes the call to the international destination 275 over the second communication lines 445 using the destination information.
  • FIG. 5 is a flowchart illustrating operations of a first embodiment of a satellite communications system according to the present invention.
  • a user terminal initiates an international call to a destination (block 500).
  • the user terminal transmits the call type as non-international and the HPMN code stored in the subscriber identity module of the user terminal over the control channel to the satellite communications system (block 505).
  • the control center receives the call type and HPMN from the user terminal (block 510) and determines the identify of the home gateway that corresponds to the HPMN received by the user terminal (block 515).
  • FIG. 6 is a flowchart illustrating operations of a second embodiment of a satellite communications system according to the present invention.
  • a user terminal initiates an international or a local call to a destination (block 600).
  • the user terminal transmits the call type, the HPMN code, and the destination information, such as a portion of the dialed digits, to the satellite communications system over the control channel (block 605).
  • the control center receives the call type, the HPMN code, and the destination information (block 610) and, if the call is an international call, determines if OCR is disabled for the user terminal based on the HPMN received by the user terminal (block 615). If OCR is disabled, the control center determines the identity of the home communications gateway for the user terminal initiating the call (block 620) and connects the user terminal to the appropriate home communications gateway via the satellite (block 625). The user terminal transmits the complete called party information to the home communications gateway via the satellite (block 630) whereupon the home communications gateway routes the call to the international destination using the called party information transmitted by the user terminal (block 635).
  • the control center determines which commumcations gateway in the satellite communications system is closest to the international destination based on the destination information received by the control center and routes the call thereto (block 640).
  • a user terminal transmits communications network information, such as a Home Public Mobile Network code, to the satellite communications system when initiating both local and international destination calls. Accordingly, the user terminal configures international calls as local calls when communicating with the satellite communications system. The satellite commumcations system can then route international destination calls via the home country (i.e., as local calls) rather than via the country which is closest to the international destination, such as when Optimal Call Routing (OCR) is used. Alternately, the user terminal transmits communications information and destination information for both local and international destination calls. Routing information available to the control center indicates whether OCR is enabled or disabled for particular subscribers to the satellite commimications system. Accordingly, the control center can route calls by selected subscribers without OCR and route calls by other subscribers using OCR. Consequently, greater awareness and control may be maintained over international calls by subscribers to some commumcations networks.
  • communications network information such as a Home Public Mobile Network code

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Relay Systems (AREA)
  • Telephonic Communication Services (AREA)

Abstract

Selon l'invention, un terminal d'usager émet une information de réseau de communications, telle qu'un code de réseau mobile publique, vers le système de communications par satellite lorsqu'il débute des appels à la fois nationaux et internationaux. Selon l'invention, le terminal d'usager configure les appels internationaux comme des appels locaux lorsqu'il est en communication avec le système de communications par satellite. Le système de communications par satellite peut alors acheminer des appels à destination internationale via le pays d'origine (c'est à dire, comme pour les appels locaux) plutôt que via le pays qui est le plus proche de la destination internationale, comme dans le cas du routage d'appel optimal (OCR). Dans une autre réalisation, le terminal d'usager émet des informations de communication et de destination à la fois pour des appels à destination locale ou internationale. L'information d'acheminement disponible au centre de commande indique si un OCR est permis ou non pour des abonnés particuliers au système de communications par satellite. Ainsi, le centre de commande peut acheminer des appels effectués par des abonnés sélectionnés sans OCR et acheminer des appels effectués par d'autres abonnés en utilisant l'OCR.
PCT/US2000/022541 1999-09-10 2000-08-17 Procedes, terminaux d'usagers, et systemes qui acheminent des appels internationaux dans un systeme de communications par satellite en utilisant une passerelle de communication domestique WO2001018995A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU69116/00A AU6911600A (en) 1999-09-10 2000-08-17 Methods, user terminals, and systems that route international calls in a satellite communications system using a home communications gateway

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US39389799A 1999-09-10 1999-09-10
US09/393,897 1999-09-10

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WO2001018995A2 true WO2001018995A2 (fr) 2001-03-15
WO2001018995A3 WO2001018995A3 (fr) 2001-10-11

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CN101800911B (zh) 2009-02-06 2012-10-17 华为技术有限公司 实现本地交换的方法及系统
CN107231183A (zh) * 2016-03-24 2017-10-03 北京信威通信技术股份有限公司 路由策略信息的生成方法及装置、路由方法及装置

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GB2295296A (en) * 1994-11-18 1996-05-22 Int Maritime Satellite Organiz Mobile satellite communications system
US6067452A (en) * 1996-05-28 2000-05-23 Comsat Corporation Technique for least cost routing for mobile satellite systems employing a GSM network infrastructure
FR2763188B1 (fr) * 1997-05-07 1999-06-11 Alsthom Cge Alcatel Procede d'acheminement de communication dans un reseau par satellite, terminal et station de base correspondants

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AU6911600A (en) 2001-04-10
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