WO1998057444A1 - Dual-mode satellite/cellular phone architecture with physically separable modes - Google Patents
Dual-mode satellite/cellular phone architecture with physically separable modes Download PDFInfo
- Publication number
- WO1998057444A1 WO1998057444A1 PCT/US1998/011399 US9811399W WO9857444A1 WO 1998057444 A1 WO1998057444 A1 WO 1998057444A1 US 9811399 W US9811399 W US 9811399W WO 9857444 A1 WO9857444 A1 WO 9857444A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cellular
- satellite
- low
- telephone
- short
- Prior art date
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
- H04B7/18563—Arrangements for interconnecting multiple systems
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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
-
- 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
- H04B7/18569—Arrangements for system physical machines management, i.e. for construction operations control, administration, maintenance
- H04B7/18571—Arrangements for system physical machines management, i.e. for construction operations control, administration, maintenance for satellites; for fixed or mobile stations
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the present invention relates to a wireless telecommunications system.
- the present invention relates to a wireless communication system that is capable of communicating over a local cellular/PCS air interface or, alternatively, a satellite air interface.
- Dual-mode satellite/cellular phones are well-known in the art, and they are capable of operating in either a cellular/PCS mode or in a satellite mode.
- satellite telephones and dual-mode cellular/satellite phones are relatively large and heavy compared to standard cellular telephones is that the components required to communicate over the satellite air interface are, in general, much larger than those required to operate over the cellular/PCS air interface.
- the directional antenna in a satellite telephone is large so that it provides the directional gain needed to help overcome the poor link margin that is characteristic of satellite signal transmissions.
- satellite telephones and/or dual-mode cellular/satellite phones contain relatively large power amplifiers and batteries, which are also needed to help overcome the relatively poor link margin. The added size and weight due to these components make satellite phones and/or dual-mode phones bulky and cumbersome to carry.
- the handset itself remains somewhat small and light weight.
- the dual-mode satellite/cellular handset transmits and receives signals to and from the satellite network through the satellite signal relay device. More specifically, upon receiving signals from the satellite network, the satellite signal relay device downconverts the RF transmission into a low power cellular signal and then retransmits the signal to the less bulky, lightweight handset over a local cellular frequency. Similarly, upon receiving a satellite communications signal from the handset, the satellite signal relay device upconverts the signal and then re-transmits it to the orbiting satellite network.
- the satellite signal relay device upconverts the signal and then re-transmits it to the orbiting satellite network.
- a dual-mode, satellite/cellular phone that is compatible with the GSM standard used in Europe could not be used in either a satellite or a cellular mode in the United States, since the United States employs the AMPS standard, as those skilled in the art will recognize.
- a local cellular/PCS operator or regulatory body may object to having the cellular/PCS frequencies reused for relaying information to the satellite signal relay device, since this may cause, under certain conditions, interference to the local cellular/PCS network.
- a need exists for a satellite/cellular phone system that allows a user to place either cellular calls or satellite calls through a lightweight satellite/cellular handset.
- a user must maintain the ability to place satellite calls through a stand-alone (i.e., self-contained) unit, wherein the communication signals are not subject to any incompatibility with local cellular services, nor subject to interference and/or distortion that may be present in the local cellular environment. Furthermore, there is a need to better ensure that the satellite subscriber has truly global or near global capability.
- PCS satellite/cellular
- a system that comprises a cellular telephone handset and a secondary telephone. Both the cellular telephone handset and the secondary telephone include a short-range, low-power transceiver. The system also includes a short-range, low-power telecommunications link which directly couples the cellular telephone handset and the secondary telephone. In accordance with another aspect of the present invention, the foregoing and other objects are achieved by a system that comprises a cellular telephone handset and a stand-alone satellite telephone. Both the cellular telephone handset and the satellite telephone include a short-range, low-power transceiver. The system further comprises a short-range, low-power telecommunications link coupling the cellular telephone handset and the stand-alone satellite telephone.
- an apparatus that comprises a cellular telephone handset and a stand-alone satellite telephone.
- the apparatus also includes means for establishing a short-range, low-power telecommunications link between the cellular telephone handset and the stand-alone satellite telephone.
- FIG. 1 is a diagram of the dual-mode satellite/cellular phone system
- FIG. 2 is a diagram of the internal architecture of the satellite and cellular/PCS phones in accordance with the present invention.
- FIG. 1 illustrates the concept embodied by the present invention, wherein a fully operational cellular/PCS phone 105 and a fully operational, self- contained, stand-alone satellite phone 110 are kept physically separated from each other.
- Both the cellular/PCS phone 105 and the stand-alone satellite phone 110 are capable of being operated independent of the other.
- the cellular/PCS phone can be used to place or receive cellular calls through a local cellular service, as represented by the cellular base station tower 115.
- the satellite phone 110 can be used to place or receive satellite calls with a satellite telecommunications network, represented by satellite 120.
- FIG. 1 also illustrates that a short-range, low power communication link 125 is maintained between the cellular/PCS phone 105 and the satellite phone 110.
- the satellite phone 110 receives an incoming call (i.e. , when the satellite phone rings)
- the cellular/PCS phone 105 will also receive the call, through the satellite phone 110, which essentially re-transmits the call from the satellite 120 to the cellular/PCS phone 105 over the short-range, low-power communication link 125.
- a user can choose to answer the incoming satellite call with the cellular/PCS phone 105, or choose to answer the incoming satellite call with the satellite phone 110, as it is a fully self- contained, stand-alone unit.
- the satellite phone 110 In order to maintain the best possible signal quality, it is preferable to situate the satellite phone 110 at or near a location having a direct line-of-sight to the orbiting satellite 120. For example, if the present invention is being used indoors, the satellite phone 110 may be placed at or near a window. If, on the other hand, the present invention is being used outdoors, the satellite phone 110 may be clipped or somehow attached to a stationary or semi-stationary object, such as the user's belt, so the user can avoid carrying the somewhat bulky satellite phone 110.
- the user During an incoming satellite call, the user, as stated above, has the option of answering the incoming call with the cellular/PCS phone 105.
- the cellular/PCS phone 105 is within the range of the satellite phone 110, as defined by the characteristics of the short-range, low-power communication link 125.
- the user may find it desirable to use the cellular/PCS phone 105 to answer the incoming satellite call for at least two reasons.
- the cellular/PCS phone 105 is more mobile than the satellite phone 110, in that the cellular/PCS phone 105 is relatively small and lightweight.
- the cellular/PCS phone 105 should be more comfortable to use in proximity to one's face, as it is far less likely to generate a significant amount of heat.
- the cellular/PCS phone 105 radiates milliwatts of power, while the satellite phone 110 radiates on the order of several watts of peak RF energy.
- the user may still want to answer an incoming satellite call with the satellite phone 110, rather than the cellular PCS phone 105, and the present invention permits the user to do this as the satellite phone 110 is, as stated above, a fully self-contained, stand-alone unit.
- the user When placing outgoing satellite calls, the user, once again, has the option of using the cellular/PCS phone 105 or the stand-alone satellite phone 110.
- the cellular/PCS phone 105 will transmit the communication signal to the satellite phone 110 over the short-range, low-power communication link 125.
- the satellite phone 110 will then re-transmit the signal to the orbiting satellite 120 over a long-range, high power RF link.
- the stand-alone satellite phone 110 in either case, essentially serves as a radio signal repeater, receiving and re-transmitting signals between the orbiting satellite 120 and the cellular/PCS phone 105, wherein the satellite phone 110 communicates with the cellular/PCS phone 105 over the above-identified, short-range, low-power communication link 125.
- FIG. 2 shows, in more detail, the internal architecture of the cellular/PCS phone 105 and the self-contained, stand-alone satellite phone 110, in accordance with a preferred embodiment of the present invention.
- the satellite phone 110 includes, among other things, an MMI 205.
- the MMI 205 allows the user to directly communicate over the satellite network without having to use the cellular/PCS phone 105.
- the satellite phone 110 also includes a relatively large directional antenna 210; an IF/RF module 215 that contains a transceiver (not shown) for transmitting and receiving satellite signals to and from the orbiting satellite 120; a logic unit 220 that provides signal processing capabilities; a microprocessor 225; and a SIM card 230 that contains a unique telephone identification code which permits the satellite phone 110 to recognize, receive and decode only appropriate incoming satellite calls.
- the satellite phone 110 includes a transceiver unit 235.
- the transceiver unit 235 is used for transmitting and receiving signals to and from the cellular/PCS phone 105 over the short-range, low-power communication link 125, when the cellular/PCS phone 105 is being used to place or receive satellite calls.
- FIG. 2 also illustrates that the cellular/PCS phone 105 contains an antenna 240; an IF/RF module 245, which includes a transceiver (not shown) for transmitting and receiving cellular/PCS calls to and from the local cellular system; a logic unit 250; a microprocessor 255; an MMI 260; and a SIM card 265.
- the antenna 240 in the cellular/PCS phone 105 is not as large as the directional antenna 210 in the satellite phone 110.
- the IF/RF module 245 is not as large as the IF/RF module 215, because the IF/RF module 245 does not contain the high power amplifiers that the satellite phone 110 requires to overcome the low link margin described above.
- the SIM card 265, installed in the cellular/PCS phone 105 contains two unique subscriber identification codes. The first permits the cellular/PCS phone 105 to recognize, receive and decode incoming cellular/PCS calls, while the second is the same as the subscriber identification code on SIM card 230, thus permitting the cellular/PCS phone 105 to also recognize, receive and decode incoming satellite network calls through satellite phone 110.
- the cellular/PCS phone 105 includes a transceiver 270. The transceiver 270 allows the cellular/PCS phone 105 to communicate with the satellite phone 110 over the aforementioned short-range, low-power communication link 125.
- the cellular/PCS phone 105 may include a SIM card 265 that contains only one unique subscriber identification code. The one subscriber identification code will permit the cellular/PCS phone 105 to recognize, receive and decode incoming calls, whether the incoming calls are through the cellular/PCS network or the satellite network.
- the user pre-selects either the cellular/PCS network as the preferred network, or the satellite network as the preferred network.
- the cellular/PCS phone 105 When the cellular/PCS phone 105 is first turned on, the unit determines whether the preferred network is available. If the preferred network is available, the subscriber code is registered with the preferred network. If the preferred network is not available, the unit determines if the secondary network is available. If it is available, then the subscriber code is registered with the secondary network. The cellular/PCS phone 105 can then receive incoming calls on either network with the same subscriber code.
- the stand-alone satellite phone 110 or the cellular/PCS handset 105, or both do not contain a SIM card.
- the subscriber identification code(s) may be stored in the memory of the corresponding unit.
- this provides a mechanism over which the cellular/PCS phone 105 and the satellite phone 110 can communicate with one another.
- the satellite phone 110 will initially receive the RF transmission from the orbiting satellite 120, downconvert the signal to baseband, then remodulate and transmit the signal to the cellular handset over the communication link 125.
- the cellular/PCS phone 105 will transmit the communication signal over the communication link 125 to the satellite phone 110, which, in turn, will encode and re- transmit the signal to the orbiting satellite 120.
- the communication link 125 will be a radio frequency (RF) link and operate in the ISM frequency band at approximately 2.5 GHz, although one skilled in the art will readily understand that other frequencies could be used. Additionally, the microwave signals will be transmitted at a relatively low power level, on the order of less than 1 watt.
- RF radio frequency
- the microwave link will not be operating in the cellular/PCS frequency bands, nor subject to any of the interference, distortion, or regulations associated with those frequency bands. Furthermore, operating the microwave link in the ISM band allows the present invention to be deployed globally, without the restriction of local government regulation, as the ISM band is unregulated.
- the microwave signals will be transmitted between the cellular/PCS phone 105 and the satellite phone 110 using a frequency hopping scheme to ensure a high quality communication link.
- a frequency hopping scheme to ensure a high quality communication link.
- the frequency hopping sequence associated with a particular one satellite phone 110 and its companion cellular/PCS handset 105 is uniquely derived from the satellite SIM code residing in the pair, thus providing different and unique frequency hopping sequences to each satellite phone 110 and cellular/PCS handset 105 user pair. This feature minimizes interference between a possible plurality of such user pairs when operating in close proximity to each other.
- the concept of the present invention can be expanded to include an alternative embodiment in which the dual-mode, cellular/PCS handset 105 is used in conjunction with one or more secondary cellular phones, wherein each of the one or more secondary cellular phones has its own subscriber identification code.
- the advantage of this alternative embodiment is that a user subscribing to several cellular services is saved from having to physically carry multiple cellular handsets.
- the dual-mode cellular/PCS handset 105 may be used in conjunction with any high power communication device, for example, a car phone.
- the cellular/PCS handset 105 would still communicate with the one or more secondary cellular phones or the high power communication device over a short-range, low-power link as previously described.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP98926232A EP0986865B1 (en) | 1997-06-13 | 1998-06-11 | Dual-mode satellite/cellular phone architecture with physically separable modes |
AU78116/98A AU746057B2 (en) | 1997-06-13 | 1998-06-11 | Dual-mode satellite/cellular phone architecture with physically separable modes |
BR9809741-5A BR9809741A (en) | 1997-06-13 | 1998-06-11 | Cellular / satellite communication and communication systems, and cellular / satellite telecommunications apparatus |
DE69810467T DE69810467T2 (en) | 1997-06-13 | 1998-06-11 | DUAL-MODE SATELLITE-CELLULAR TELEPHONE ARCHITECTURE WITH PHYSICALLY SEPARABLE FASHIONS |
HK01101774A HK1031054A1 (en) | 1997-06-13 | 2001-03-12 | Dual-mode satellite/cellular phone architecture with physically separable modes. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/874,328 US6134437A (en) | 1997-06-13 | 1997-06-13 | Dual-mode satellite/cellular phone architecture with physically separable mode |
US08/874,328 | 1997-06-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998057444A1 true WO1998057444A1 (en) | 1998-12-17 |
Family
ID=25363517
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1998/011399 WO1998057444A1 (en) | 1997-06-13 | 1998-06-11 | Dual-mode satellite/cellular phone architecture with physically separable modes |
Country Status (10)
Country | Link |
---|---|
US (1) | US6134437A (en) |
EP (1) | EP0986865B1 (en) |
KR (1) | KR20010013693A (en) |
CN (1) | CN1135738C (en) |
AU (1) | AU746057B2 (en) |
BR (1) | BR9809741A (en) |
DE (1) | DE69810467T2 (en) |
HK (1) | HK1031054A1 (en) |
ID (1) | ID24445A (en) |
WO (1) | WO1998057444A1 (en) |
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Also Published As
Publication number | Publication date |
---|---|
DE69810467D1 (en) | 2003-02-06 |
ID24445A (en) | 2000-07-20 |
AU7811698A (en) | 1998-12-30 |
HK1031054A1 (en) | 2001-05-25 |
CN1267412A (en) | 2000-09-20 |
DE69810467T2 (en) | 2003-10-02 |
AU746057B2 (en) | 2002-04-11 |
KR20010013693A (en) | 2001-02-26 |
CN1135738C (en) | 2004-01-21 |
EP0986865A1 (en) | 2000-03-22 |
EP0986865B1 (en) | 2003-01-02 |
US6134437A (en) | 2000-10-17 |
BR9809741A (en) | 2000-07-11 |
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