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WO2000051266A1 - Communications cellulaires par satellite utilisant des services de reseau domestique - Google Patents

Communications cellulaires par satellite utilisant des services de reseau domestique Download PDF

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Publication number
WO2000051266A1
WO2000051266A1 PCT/US2000/004467 US0004467W WO0051266A1 WO 2000051266 A1 WO2000051266 A1 WO 2000051266A1 US 0004467 W US0004467 W US 0004467W WO 0051266 A1 WO0051266 A1 WO 0051266A1
Authority
WO
WIPO (PCT)
Prior art keywords
satellite
communications
terrestrial
subscriber unit
communications system
Prior art date
Application number
PCT/US2000/004467
Other languages
English (en)
Inventor
Jim E. Helm
Steve Magee
James William Bishop, Jr.
Original Assignee
Motorola 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 Motorola Inc. filed Critical Motorola Inc.
Priority to AU37036/00A priority Critical patent/AU3703600A/en
Publication of WO2000051266A1 publication Critical patent/WO2000051266A1/fr

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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
    • H04B7/18567—Arrangements for providing additional services to the basic mobile satellite telephony service

Definitions

  • the invention relates to cellular communications and, more particularly, to satellite cellular communications interfaced with terrestrial cellular communications systems.
  • a range of communication services can be provided to subscribers who roam outside of the bounds of their home systems.
  • the satellite system can provide telecommunications services to the subscriber provided a roaming agreement with the subscriber's home cellular system is in place.
  • roaming agreements virtually any subscriber unit, which can communicate with an orbiting satellite, can place outgoing cellular telephone calls as well as receive incoming cellular telephone calls.
  • the home system When a subscriber leaves the bounds of the home network and roams into an area served by a satellite cellular communications system, the home system is queried by the satellite cellular communications system in order to determine if the roaming subscriber is valid within the home system. This allows the satellite cellular system to bill the home system for any services which the satellite cellular communications system provides to the roaming subscriber. In a typical system, the satellite system places any information acquired from the subscriber's home network into a visitor location register.
  • roaming arrangements One drawback of roaming arrangements is that the roaming subscriber must make use of the features of the satellite cellular communication system as these features are implemented in the system. Therefore, if there are features which exist only in the home subscriber system which do not exist in the satellite system, the roaming subscriber can make use of only those features offered by the satellite system. Additionally, in the event that the satellite system does offer features equivalent to those offered by the home subscriber network, these features present different user interfaces. These differences require the roaming subscriber to quickly become accustomed to using the particular feature as it has been implemented within the satellite cellular communications system.
  • a global telecommunications system which allows a roaming subscriber to make use of the features implemented in the subscriber's home network while communicating by way of a satellite cellular communications system.
  • a global telecommunications system which allows these features to be implemented in a manner identical to the implementation in the subscriber's home network in order to allow system differences to be transparent to the roaming subscriber unit.
  • FIG. 1 illustrates a satellite access subsystem in a cellular communications environment which allows satellite cellular communications using home network services in accordance with a preferred embodiment of the invention
  • FIG. 2 illustrates another embodiment of a satellite access subsystem in a cellular communications environment which allows satellite cellular communications using home network sen/ices in accordance with a preferred embodiment of the invention
  • FIG. 3 illustrates a method executed by a satellite access subsystem in a cellular communications environment in accordance with a preferred embodiment of the invention.
  • a method and system for satellite cellular communications using home network services allows a roaming subscriber to make use of the services provided by a home network while roaming within an area covered by a satellite cellular communications system. Additionally, services provided to a roaming subscriber are provided in a manner which is substantially identical to the manner in which these services are provided in the subscriber's home cellular communications system. Therefore, as services become available in a subscriber's home network, these sen/ices can be extended to the satellite system when the subscriber roams into an area covered by the satellite cellular communications system. Furthermore, operators of terrestrial cellular systems who wish to extend their coverage areas through the use of satellite assets are not required to operate dedicated satellite networks.
  • FIG. 1 illustrates a satellite access subsystem (80) in a cellular communications environment which allows satellite cellular communications using home network sen/ices in accordance with a preferred embodiment of the invention.
  • subscriber unit 55 communicates with satellite communications node 45 through link 50.
  • subscriber unit 55 can be any communications device such as a hand-held telephone subscriber unit, portable fax machine, or other device which communicates by way of a satellite communications node to other voice or data terminals.
  • Satellite communications node 45 is representative of a global telecommunications system which provides access to communications services through a network of orbiting satellites. These satellites can be placed in low earth orbits, or can be placed in other types of orbits such as medium earth orbits or geostationary orbits. Additionally, satellite communications node 45 may communicate with other, similarly equipped satellites, through one or more inter- satellite cross links. For this example, satellite communications node 45 communicates directly with earth terminal controller 35 through link 40.
  • Earth terminal controller 35 communicates with satellite communications node 45 through link 40. This communication includes satellite orbit adjustments, as well as message traffic intended for and originating from subscriber unit 55.
  • satellite communications node 45 functions to provide roaming subscriber unit 55 with communications services by projecting a communications beam onto the geographic area occupied by subscriber unit 55.
  • the management of satellite resources such as the activation of communications beams, subscriber unit location translations, and cellular telephone call handovers are performed by satellite base station controller 70.
  • satellite resources include a portion of the available frequency bandwidth in a frequency domain multiple access (FDMA) system, a time slice in a time domain frequency access (TDMA) system, or a particular orthogonal code used in a code division multiple access (CDMA) system.
  • FDMA frequency domain multiple access
  • TDMA time slice in a time domain frequency access
  • CDMA code division multiple access
  • Satellite base station controller 70 may be co-located with earth terminal controller 35, or may be remote from earth terminal controller 35. Additionally, although satellite base station controller 70 is shown as communicating with earth terminal controller 35 through routers 25, this need not be the case. Satellite base station controller 70 may interface directly with earth terminal controller 35 without loss of functionality. Routers 25 function to convey message traffic from earth terminal controller 35 to terrestrial system interface 30 as well as functioning to convey control commands to satellite base station controller 70.
  • Terrestrial system interface 30 interfaces with at least one network services system 14 in at least one public land mobile network (PLMN) 10 as shown in FIG. 1. Desirably, terrestrial system interface 30 interfaces with other networks such as PLMN 20 as shown in FIG. 1.
  • PLMN public land mobile network
  • PLMN 10 and network services subsystem 14 may represent any network services system in any network, including private land mobile networks, enhanced specialized mobile radio networks, public switched telephone networks or private branch exchanges supporting wireless local loop systems and packet-switched data networks. As shown in FIG. 1 , network services subsystem 14 may also interface with existing wireless base station subsystems 19, which provide subscribers of PLMN 10 with wireless access to the services of network services subsystem 14. In accordance with a preferred embodiment, satellite access subsystem 80 does not contain functionality, such as location registers or switching centers, normally found within a network sen/ices system.
  • Terrestrial system interface 30 supports connection of satellite access subsystem 80 to PLMN 10 through interface 12.
  • Interface 12 comprises data communication links and protocols for carrying user information. This user information can be encoded speech, facsimile, or other data. Additionally, interface 12 comprises data communication links and protocols for carrying resource control signalling information such as channel assignments. Further, interface 12 comprises data communication links and protocols for carrying user services signalling information such as sen/ice requests and responses.
  • service signalling information and user information are delivered between network services subsystem 14 in PLMN 10 and subscriber unit 55 by way of satellite access subsystem 80.
  • subscriber unit 55 desires to inform PLMN 10 of its location or make use of a particular cellular service provided by PLMN 10, the subscriber unit transmits the appropriate service instantiation request to satellite communications node 45.
  • the service instantiation request is then conveyed to earth terminal controller 35 through link 40.
  • the request is then routed by way of one of routers 25 to terrestrial system interface 30.
  • the request is then forwarded through interface 12 to network services system 14.
  • the response to the sen/ice instantiation request is then generated in network sen/ices subsystem 14 and conveyed through interface 12 back to terrestrial system interface 30.
  • the response is then forwarded through router 25, through earth terminal controller 35, to subscriber unit 55 through satellite communications node 45.
  • sen/ices signalling information between network services subsystem 14 and subscriber unit 55 is treated as a generic message. Therefore, the content of such traffic is preferably not examined, interpreted, nor implemented by any part of satellite access subsystem 80.
  • This aspect of the invention ensures that for those services which require only signalling to effect, such as location updating and subscription management, the subscriber using subscriber unit 55 experiences those sen/ices in substantially the same way when access is provided by satellite access subsystem 80 as when access is provided by base station subsystem 19 in PLMN 10.
  • a resource control signalling protocol is used on interface 12 to establish resources in satellite access subsystem 80 for the user information flow.
  • network services subsystem 14 requests the necessary access resources, such as channel bandwidth and information adaptation functions.
  • the resource control protocol on interface 12 is the same as is used on interface 11 between network services subsystem 14 and base station subsystem 19 inside PLMN 10.
  • satellite access subsystem 80 The portion of satellite access subsystem 80 which is required to act on the resource control signalling from network services subsystem 14 is satellite base station controller 70, which must ensure that adequate resources of satellite communications node 45 routers 25, and terrestrial system interface 30 are available in order to provide the particular service feature to subscriber unit 55.
  • the resource control protocol is used between subscriber unit 55 and satellite base station controller 70.
  • the service-independent resource control protocol coupled with the transparent passing of services signalling and user information by satellite access subsystem 80 ensures that the user of subscriber unit 55 experiences the network services in substantially the exact same way when access is provided by satellite access subsystem 80 as when access is provided by base station subsystem 19 in PLMN 10.
  • satellite access subsystem 80 operators of public networks, such as PLMNs 10 and 20, can provide services to their subscribers through the existing satellite network. Additionally, these services are provided using the network services systems of the individual networks. Further, since communications between PLMNs 10 and 20 and satellite access subsystem 80 involves resource control, using interface 12, these service features can be implemented through the satellite access system in the precise manner as those services are implemented in each of PLMNs 10 and 20.
  • FIG. 2 illustrates another embodiment of a satellite access subsystem (80) in a cellular communications environment which allows satellite cellular communications using home network services in accordance with a preferred embodiment of the invention.
  • FIG. 2 incorporates many of the identical elements of FIG. 1.
  • the network elements of PLMN 110 include elements which comply with GSM standards.
  • interface 112 and 113 interface satellite base station controllers 170 and 130 of satellite access subsystem 180 with PLMN 110 and 120 using the "A" interface.
  • the "A" interface is used to communicate between base station subsystems and mobile services switching centers resident within a network subsystem.
  • satellite base station controller 130 interfaces with mobile services switching center 214 through "A" interface 113.
  • satellite base station controller 170 interfaces to mobile services switching center 114 through "A" interface 112.
  • mobile services switching center 114 performs the functions needed to provide service features to the subscriber units within the coverage area of PLMN 110 based on subscription information stored in home location register 119.
  • mobile services switching center 214 performs the functions needed to provide sen/ices to the subscriber units within the coverage area of PLMN 120, based on subscription information stored in home location register 219.
  • a interface 112 and elements of satellite access subsystem 80 provide a transport layer which conveys user information and services signalling, between PLMN 110 and subscriber unit 55, without interpreting their contents.
  • A” interface 112 also provides a standard resource control protocol, the "Base Station Subsystem Management Application Protocol" known as BSSMAP to those skilled in the art, for mobile services switching center 114 to request access to system resources from satellite base station controller 170.
  • BSSMAP Base Station Subsystem Management Application Protocol
  • earth terminal controller 135 desirably interfaces with multiple satellite base station controllers, such as satellite base station controllers 130 and 170, thereby supporting multiple networks, such as PLMNs 110 and 120. Additionally, for each PLMN supported by satellite access subsystem 80, the associated satellite base station controller may optionally be co-located either with earth terminal controller 135, or with the corresponding mobile services switching center, according to the business and technical circumstances particular to the PLMN.
  • the network sen/ices system of FIG.1 is a Public Switched Telephone Network.
  • the interface between satellite access subsystem 80 and the wireline switched telephone network is the V5.2 standard.
  • FIG. 3 illustrates a method executed by a satellite access subsystem in a cellular communications environment in accordance with a preferred embodiment of the invention.
  • the satellite access subsystem receives a service instantiation request originated from a subscriber unit.
  • the service instantiation request is conveyed to a terrestrial communications system via a terrestrial system interface.
  • a network sen/ices system for the network in which the subscriber unit is home provides the response to the service instantiation request.
  • the satellite access subsystem receives the message traffic destined for the particular subscriber unit.
  • the particular response is conveyed to the subscriber unit through the satellite access system.
  • a method and system for satellite cellular communications using home network services allows a roaming subscriber to make use of the services provided by a home network while roaming within an area covered by a satellite cellular communications system. Additionally, sen/ices provided to a roaming subscriber are provided in a manner which is substantially identical to the manner in which these services are provided in the subscriber's home cellular communications system. Therefore, as services become available in a subscriber's home network, these services can be extended to the satellite system when the subscriber roams into an area covered by the satellite cellular communications system allowing any system differences to transparent to the user. Furthermore, operators of terrestrial cellular systems who wish to extend their coverage areas through the use of satellite assets are not required to operate dedicated satellite networks. These operators can make use of existing satellite networks in order to allow their own unique features to be used by their own subscribers regardless of the location of those subscribers.

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

Abstract

L'invention concerne un procédé et un système utilisant des services de réseau domestique, qui permettent à une unité d'abonné d'utiliser les services fournis par un réseau téléphonique domestique, tel qu'un réseau mobile public terrestre (10), tout en se déplaçant dans une zone couverte par un système de communications cellulaires par satellite. Ladite unité d'abonné (55) transmet une demande d'instanciation de service à un sous-système d'accès (80) par satellite, qui achemine ladite demande vers une interface (30) de système terrestre et vers un système de commutation (14) de réseau d'un réseau mobile public terrestre (10). Le système de commutation (14) de réseau génère et achemine une réponse par l'intermédiaire du sous-système d'accès (80) par satellite vers l'unité d'abonné. Le sous-système d'accès (80) par satellite sert de conduit à la fois pour la demande d'instanciation de service et pour la réponse associée, et n'examine ni ne met en oeuvre la réponse particulière.
PCT/US2000/004467 1999-02-25 2000-02-22 Communications cellulaires par satellite utilisant des services de reseau domestique WO2000051266A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU37036/00A AU3703600A (en) 1999-02-25 2000-02-22 Satellite cellular communications using home network services

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US25772499A 1999-02-25 1999-02-25
US09/257,724 1999-02-25

Publications (1)

Publication Number Publication Date
WO2000051266A1 true WO2000051266A1 (fr) 2000-08-31

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Application Number Title Priority Date Filing Date
PCT/US2000/004467 WO2000051266A1 (fr) 1999-02-25 2000-02-22 Communications cellulaires par satellite utilisant des services de reseau domestique

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AU (1) AU3703600A (fr)
WO (1) WO2000051266A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996034503A1 (fr) * 1995-04-25 1996-10-31 Aethos Communication Systems Systeme de telecommunications mobile a deux modes
EP0831599A2 (fr) * 1996-09-04 1998-03-25 Globalstar L.P. Système mobile automatique satellite terrestrial avec terminal mobile
GB2322521A (en) * 1997-02-24 1998-08-26 Vodafone Ltd Method of Providing Access to First and Second Communication Networks
EP0869628A1 (fr) * 1997-04-01 1998-10-07 ICO Services Ltd. Interfonctionnement entre réseaux de télécommunication

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996034503A1 (fr) * 1995-04-25 1996-10-31 Aethos Communication Systems Systeme de telecommunications mobile a deux modes
EP0831599A2 (fr) * 1996-09-04 1998-03-25 Globalstar L.P. Système mobile automatique satellite terrestrial avec terminal mobile
GB2322521A (en) * 1997-02-24 1998-08-26 Vodafone Ltd Method of Providing Access to First and Second Communication Networks
EP0869628A1 (fr) * 1997-04-01 1998-10-07 ICO Services Ltd. Interfonctionnement entre réseaux de télécommunication

Also Published As

Publication number Publication date
AU3703600A (en) 2000-09-14

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