WO2005101693A1 - Different utilization of satellite frequency bands by a space-based network and an ancillary terrestrial network - Google Patents
Different utilization of satellite frequency bands by a space-based network and an ancillary terrestrial network Download PDFInfo
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- WO2005101693A1 WO2005101693A1 PCT/US2005/012100 US2005012100W WO2005101693A1 WO 2005101693 A1 WO2005101693 A1 WO 2005101693A1 US 2005012100 W US2005012100 W US 2005012100W WO 2005101693 A1 WO2005101693 A1 WO 2005101693A1
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- frequencies
- frequency band
- radioterminals
- satellite frequency
- ancillary terrestrial
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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
- H04B7/18563—Arrangements for interconnecting multiple systems
Definitions
- This invention relates to radioterminal communications systems and methods, and more particularly to terrestrial cellular and satellite cellular radioterminal communications systems and methods.
- radiotelephone includes cellular and/or satellite radiotelephones with or without a multi-line display; Personal Communications System (PCS) terminals that may combine a radiotelephone with data processing, facsimile and/or data communications capabilities; Personal Digital Assistants (PDA) that can include a radio frequency transceiver and/or a pager, Internet/Intranet access, Web browser, organizer, calendar and/o r a global positioning system (GPS) receiver; and/or conventional laptop and/or palmtop computers or other appliances, which include a radio frequency transceiver.
- a radiotelephone also may be referred to herein as a "radioterminal", a “mobile terminal” or simply as a "terminal”.
- Terrestrial networks can enhance cellular satellite radioterminal system availability, efficiency and/or economic viability by terrestrially reusing at least some of the frequency bands that are allocated to cellular satellite radioterminal systems.
- satellite telecommunications repeaters are provided which receive, amplify, and locally retransmit the downlink signal received from a satellite thereby increasing the effective downlink margin in the vicinity of the satellite telecommunications repeaters and allowing an increase in the penetration of uplink and downlink signals into buildings, foliage, transportation vehicles, and other objects which can reduce link margin.
- Both portable and non-portable repeaters are provided. See the abstract of U.S. Patent 5,937,332.
- Satellite radioterminals for a satellite radioterminal system or method having a terrestrial communications capability by terrestrially reusing at least some of the same satellite frequency band and using substantially the same air interface for both terrestrial and satellite communications may be cost effective and/or aesthetically appealing.
- Conventional dual band/dual mode radioterminal alternatives such as the well known Thuraya, Iridium and/or Globalstar dual mode satellite/terrestrial radioterminals, duplicate some components (as a result of the different frequency bands and/or air interface protocols between satellite and terrestrial communications), which leads to increased cost, size and/or weight of the radioterminal. See U.S. Patent 6,052,560 to the present inventor Karabinis, entitled Satellite System Utilizing a Plurality of Air Interface Standards and Method Employing Same.
- communicating between the space-based component and first radioterminals over forward links using frequencies from the first satellite frequency band and over return links using frequencies from the first satellite frequency band may include communicating between a first satellite of the SBC and the first radioterminals over forward links using frequencies from the first satellite . frequency band and return links using frequencies from the first satellite frequency band.
- Communicating between the space-based component and second radioterminals over forward links using frequencies from the second satellite frequency band and over return links using frequencies from the second satellite frequency band may include communicating between a second satellite of the SBC and the second radioterminals over forward links using frequencies from the second satellite frequency band and over return links using frequencies from the second satellite frequency band.
- Communications from the first ancillary terrestrial component to at least some of the radioterminals may use at least one of the frequencies from the first satellite frequency band, and communications from at least some of the radioterminals to the second ancillary terrestrial component may use at least one of the frequencies from the second satellite frequency bands.
- Communications services may be provided to radioterminals using the first and/or second ancillary terrestrial components in a common geographic region or over respective different geographic regions.
- communications services may be provided to respective first and/or second classes and/or types of radioterminals using the first and/or second ancillary terrestrial components.
- the ancillary terrestrial network further includes a third ancillary terrestrial component.
- communications services may be provided to respective first, second and/or third types and/or classes of radioterminals using the first, second and/or third ancillary terrestrial components.
- methods are - provided for operating a radioterminal communications system including a space- based network, comprising a space-based component, and an ancillary terrestrial network comprising one or more ancillary terrestrial components.
- the methods include communicating between the one or more ancillary terrestrial components and at least some of a plurality of radioterminals using frequencies from a first and/or second satellite frequency band in a Time Division Duplex (TDD) mode, and communicating between the space-based component and at least some of the plurality of radioterminals using frequencies from the first and/or second satellite frequency band in a Frequency Division Duplex (FDD) mode and/or a TDD mode.
- the first satellite frequency band may include a first one of an L-band of frequencies and an S- band of frequencies and the second satellite frequency band may include a second one of the L-band of frequencies and the S-band of frequencies.
- a radioterminal communications system includes an ancillary terrestrial system/network/component configured to receive from at least some of a plurality of radioterminals using frequencies from a first satellite frequency band and to transmit to at least some of the plurality of radioterminals using frequencies from a second satellite frequency band.
- the radioterminal communications system further includes a space-based system/network/component configured to communicate with the plurality of radioterminals using at least some of the frequencies from the first satellite frequency band and/or at least some of the frequencies from the second satellite frequency band.
- the space-based system/network/component may be configured to communicate with first radioterminals over forward links using frequencies from the first satellite frequency band and over return links using frequencies from the first satellite frequency band and to communicate with second radioterminals over forward links using frequencies from the second satellite frequency band and over return links using frequencies from the second satellite frequency band.
- the ancillary terrestrial system/network/component may be configured to receive from third radioterminals using frequencies from the first satellite frequency band and to transmit to the third radioterminals using frequencies from the second satellite frequency band.
- the space-based system/network/component is further configured to transmit to first ones of the first radioterminals using frequencies from the first satellite frequency band and to receive from second ones of the first radioterminals using frequencies from the first satellite frequency band.
- the ancillary terrestrial system/network/component may include a first ancillary terrestrial component configured to receive from at least some of the radioterminals using at least one of the frequencies from the first satellite frequency band, and a second ancillary terrestrial component configured to transmit to at least some of the radioterminals using at least one of the frequencies from the second satellite frequency band.
- the ancillary terrestrial system/network/component may also include a third ancillary terrestrial component configured to receive from at least some of the radioterminals using at least one of the frequencies from the first satellite frequency band and to transmit to at least some of the radioterminals using at least one of the frequencies from the second satellite frequency band.
- first element below could be termed a second element, and similarly, a second element may be termed a first element without departing from the teachings of the present invention.
- the term “and/or” includes any and all combinations of one or more of the associated listed items. The symbol “/” is also used as a shorthand notation for "and/or”.
- substantially the same band(s) means that two or more bands being compared substantially overlap, but that there may be some areas of non-overlap, for example at a band end.
- substantially the same air interface(s) means that two or more air interfaces being compared are similar but need not be identical.
- a satellite radioterminal communications service provider may have or may acquire a license and/or authority to operate over at least some frequencies of a first satellite frequency band and over at least some frequencies of at least a second satellite frequency band.
- the first satellite frequency band may be an L- band satellite frequency band and the second satellite frequency band may be an S- band satellite frequency band.
- the satellite radioterminal communications service provider may have or may acquire a license and/or authority to operate over a first set of frequencies of a satellite frequency band and over at least a second set of frequencies of the satellite frequency band.
- the service provider may request and receive regulatory authority to pool/aggregate at least some frequencies from each one of the at least two satellite frequency bands and/or first and second set of frequencies of the satellite frequency band and deploy systems and/or methods that may be operative over the pool/aggregate of the at least some frequencies from each of the at least two satellite frequency bands and/or the first and second set of frequencies of the satellite frequency band.
- Some embodiments of the present invention provide satellite radioterminal communications systems and methods wherein multiple satellite frequency bands are used differently by a space-based network and an ancillary terrestrial network. More specifically, some embodiments of the present invention comprise a Space-Based Network (SBN) and an Ancillary Terrestrial Network (ATN) wherein the SBN and the ATN utilize the at least two satellite frequency bands in different ways.
- the SBN comprises at least one Space-Based Component (SBC), such as a satellite, that is operative to communicate with at least one satellite radioterminal over forward and return links of the first satellite frequency band and/or over forward and return links of the second satellite frequency band.
- SBC Space-Based Component
- the ATN comprises at least one Ancillary Terrestrial Component (ATC), and is operative to send information from at least one ATC radioterminal to the at least one ATC utilizing at least one frequency of the first satellite frequency band.
- the ATN is also operative to send information from the at least one ATC to the at least one ATC radioterminal utilizing at least one frequency of the second satellite frequency band.
- the at least one frequency utilized by the ATC radioterminal may be a frequency belonging to a forward and/or a return link of the first satellite frequency band.
- the at least one frequency utilized by the ATC may be a frequency belonging to a forward and/or a return link of the second satellite frequency band.
- Figures 1-3 schematically illustrate satellite radioterminal cornmunications systems and methods according to various embodiments of the present invention. More specifically, as shown in Figure 1, a space-based component, such as a satellite 110, communicates with one or more radioterminals 120 over a satellite footprint 112. The radioterminals 120 are also configured to communicate with one or more ATCs 130 of an ATN, wherein the ATN may be geographically spaced apart from and/or at least partially overlapping with the satellite footprint 112.
- the satellite 110 communicates with the radioterminal 120 using forward link frequencies in the first satellite band (FI) and/or forward link frequencies in the second satellite band (F2), denoted collectively by F1/F2. Also, the radioterminal 120 communicates with the satellite 110 using return link frequencies in the first satellite band (Rl) and/or return link frequencies in the second satellite band (R2), collectively referred to as R1/R2. Terrestrially, the radioterminals 120 transmit communications to one or more ATCs 130 using substantially the same return link frequencies in the first satellite band (Rl ! ) and/or substantially the same forward link frequencies in the first satellite band (FI'), collectively referred to as Rl ' FI 1 .
- the ATCs 130 transmit communications to the radioterminals 120 using substantially the same return link frequencies of the second satellite band (R2') and/or substantially the same forward link frequencies of the second satellite band (F2'), collectively referred to as R27F2'.
- the second satellite band such as the S-band
- the first satellite band such as the L-band
- the radioterminals 120 may not radiate terrestrially for the purpose of communicating with one or more ATCs 130 using frequencies of the second satellite band, such as the S-band and/or the ATCs 130 may not radiate terrestrially for the purpose of communicating with one or more radioterminals 120 using frequencies of the first satellite band, such as the L-band.
- Reduced interference potential may thereby be provided in some embodiments of the invention.
- the prime (') notation may also indicate a subset of the unprimed frequency band, such as at least one frequency of the unprimed frequency band, in other embodiments of the present invention.
- Figure 2 illustrates other embodiments of the present invention, where two types of radioterminals 220a, 220b are provided that communicate with an ATC 130, and -with a satellite 110.
- the satellite 110 is configured to communicate with the first type of radioterminals 220 a using forward and return link frequencies in the first satellite band (FI and Rl), and to communicate with the second radioterminals 220b using forward and return link frequencies in the second satellite band (F2 and R2).
- Both of the radioterminals 220a and 220b are configured to communicate with one or more ATCs 130 using the frequency bands that were described above in connection with Figure 1.
- the radioterminals 220a and 220b may not radiate terrestrially for the purpose of communicating with one or more ATCs 130 using frequencies of the second satellite band, such as the S-band and/or the ATCs 130 may not radiate terrestrially for the purpose of communicating with one or more radioterminals 120a, 120b using frequencies of the first satellite band, such as the L-band.
- Figure 3 illustrates other embodiments of the present invention from the separate standpoints of SBN operation and ATN operation. SBN operation also is illustrated relative to the frequencies it uses.
- a satellite 110 communicates with first radioterminals 220a using a forward link frequency from the first satellite band (FI) and a return link frequency from the first satellite band Rl, such as the L-band. It is understood that the two radioterminals 220a that are illustrated as separate units in Figure 3 may be the same radioterminal unit.
- the satellite 110 also communicates with second radioterminals 220b over a forward link frequency (F2) and a return link frequency (R2) from the second satellite band, such as S-band.
- F2 forward link frequency
- R2 return link frequency
- the two radioterminals 220b that are illustrated as separate units in Figure 3 may be the same radioterminal unit.
- the SBN may comprise two or more satellites where at least one satellite is configured to communicate with radioterminals using at least some frequencies of the first satellite band, such as the L-band, and where at least a second satellite is configured to communicate with radioterminals using at least some frequencies of the second satellite band, such as the S-band.
- an ATN radioterminal 220c which may be the same or different from radioterminals 220a and/or 220b, communicates with an ATC 130 using substantially the first satellite band SB1, or at least a portion thereof, for return link communications and substantially the second satellite band SB2, or at least a portion thereof, for forward link communications.
- the ATN terminals 220c therefore do not radiate terrestrially to communicate with the ATC(s) 130 using frequencies of the second satellite band, such as the S-band, and the ATC(s) 130 does/do not radiate terrestrially to communicate with the radioterminal(s) 220c using frequencies of the first satellite band, such as the L-band, in some embodiments of Figure 3.
- the ATN may be configured with at least one first and/or at least ⁇ ne second type of ATC.
- the at least one first type of ATC may be configured to comr unicate with at least one radioterminal by radiating at least one frequency of the first satellite band forward link(s) and to receive communications from at least one radioterminal by receiving at least one frequency of the first satellite band return link(s).
- the at least one second type of ATC may be configured to communicate with at least one radioterminal by radiating at least one frequency of the second satellite band forward link(s) and to receive communications from at least one radioterminal by receiving at least one frequency of the second satellite band return link(s).
- the at least one first and the at least one second ATC may be deployed to provide communications service to radioterminals over a common, substantially common, or different geographic areas.
- the ATN may be configured with at least one first and/or at least one second and/or at least one third type of ATC.
- the at least one first type of ATC may be configured to communicate with at least one radioterminal by radiating at least one frequency of the first satellite band forward link(s) and to receive communications from at least one radioterminal by receiving at least one frequency of the first satellite band return link(s).
- the at least one second type of ATC may be configured to communicate with at least one radioterminal by radiating at least one frequency of the second satellite band forward link(s) and to receive communications from at least one radioterminal by receiving at least one frequency of the second satellite band return link(s).
- the at least one third type of ATC may be configured to communicate with at least one radioterminal by radiating at least one frequency of the second satellite band forward and/or return link(s) and to receive communications from at least one radioterminal by receiving at least one frequency of the first satellite band return and/or forward link(s).
- the at least one first, second and/or third ATC may be deployed to provide communications service to radioterminals over a common, substantially common, or different geographic areas.
- the at least one first type of ATC may be deployed to provide service to radioterminals in New York
- the at least one second type of ATC may be deployed to provide service to radioterminals in Boston
- the at least one third type of ATC may be deployed to provide service to radioterminals in Los Angeles.
- all three ATC types, or any two of the three ATC types may be deployed in the same or substantially the same geographic area to provide service to different classes/types of radioterrninals and/or to one class/type of radioterminals.
- the ATN may be configured with at least one ATC that is configured to communicate with at least one radioterminal in a Time Division Duplex (TDD) mode using any set of frequencies of a first satellite frequency band and/or a second satellite frequency band.
- TDD Time Division Duplex
- such an ATC may communicate with at least some of a plurality of radioterminals using frequencies from the first and/or second satellite frequency band in a TDD mode, while a space- based component is configured to communicate with at least some of the plurality of radioterminals using frequencies from the first and/or second satellite frequency band in a Frequency Division Duplex (FDD) mode.
- FDD Frequency Division Duplex
- a SBN, SBC, ATN and or ATC may be configured to establish preferential communications with radioterminals by using preferentially the first and/or second satellite frequency band and/or a portion of a satellite frequency band.
- the SBN, SBC, ATN and/or ATC may each be configured to selectively reuse frequencies geographically and the SBN, SBC, ATN and ATC may each be configured to selectively reuse frequencies geographically differently.
- the selective geographic frequency reuse of the given frequency by the SBN, SBC, ATN, and/or ATC may be the same or different.
- the ATN and/or at least one ATC is/are configured to communicate with radioterminals using a TDD air interface protocol in conjunction with a SBN and/or a SBC that is/are configured to communicate with the same and/or other radioterminals using a FDD and/or a TDD air interface protocol(s)
- the SBN, SBC, ATN the at least one ATC and/or at least one radioterminal may be configured and/or responsive to establish preferential communications between the ATN and/or the at least one ATC and the radioterminal over a first geographic area and/or time period and the SBN, SBC, ATN
- the at least one ATC and/or at least one radioterminal may be configured and/or responsive to establish preferential communications between the SBN and/or the SBC and the radioterminal over a second geographic region and/or time period (such as a time period associated with an emergency).
- the ATN and/or at least one ATC may be configured to transmit information to radioterminals using a polarization that is substantially orthogonal and/or different relative to a polarization used by the SBN and/or the SBC to communicate with at least some radioterminals.
- a radioterminal communicating with the ATN and/or at least one ATC is configured to radiate and/or receive electro-magnetic waveform(s) to/from the ATN and/or the at least one ATC in a substantially linearly-polarized and/or circularly-polarized spatial orientation(s) using one or more antenna(s) and/or antenna elements that may be substantially orthogonally-polarized, differently polarized and/or spaced apart and the ATN and/or the at least one ATC may be configured to receive and process and/or process and transmit information from/to the radioterminal using at least two substantially orthogonally-polarized antennas and/or antenna elements, differently polarized antennas and or antenna elements and/or spaced-apart antennas and/or antenna elements.
- a radioterminal may be configured to communicate with the ATN and/or at least one ATC using a first antenna sub-system, electro-magnetic polarization and/or Equivalent Isotropic Radiated Power (EIRP) level of the radioterminal and the radioterminal may further be configured to establish communications with a SBN and/or at least one SBC of the SBN vising a second antenna sub-system, electromagnetic polarization and/or EIRP level
- the first and second antenna sub-systems, electro-magnetic polarizations and/or EIRP levels are the same and/or identical or substantially the same and/or identical; in other embodiments, the first and second antenna sub-systems, electro-magnetic polarizations and/or EIRP levels differ at least partially.
- the at least one ATC is configured to communicate simultaneously with at least two (a first and a second) spaced apart radioterminals in a geographic area using substantially a common set of frequencies (co-channel/co-frequency communications) and being able to discriminate between the communications of the at least two radioterminals by using at least two antenna patterns that are different in a spatial and/or polarization orientation.
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05732823.9A EP1738491B1 (en) | 2004-04-12 | 2005-04-08 | Different utilization of satellite frequency bands by a space-based network and an ancillary terrestrial network |
MXPA06011764A MXPA06011764A (en) | 2004-04-12 | 2005-04-08 | Different utilization of satellite frequency bands by a space-based network and an ancillary terrestrial network. |
CN2005800120657A CN1943137B (en) | 2004-04-12 | 2005-04-08 | System and method for different utilization of satellite frequency bands by a space-based network and an ancillary terrestrial network |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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US56132504P | 2004-04-12 | 2004-04-12 | |
US60/561,325 | 2004-04-12 | ||
US11/082,458 US7636566B2 (en) | 2004-04-12 | 2005-03-17 | Systems and method with different utilization of satellite frequency bands by a space-based network and an ancillary terrestrial network |
US11/082,458 | 2005-03-17 |
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Publication Number | Publication Date |
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WO2005101693A1 true WO2005101693A1 (en) | 2005-10-27 |
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PCT/US2005/012100 WO2005101693A1 (en) | 2004-04-12 | 2005-04-08 | Different utilization of satellite frequency bands by a space-based network and an ancillary terrestrial network |
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US (2) | US7636566B2 (en) |
EP (2) | EP2230776A3 (en) |
CN (1) | CN1943137B (en) |
MX (1) | MXPA06011764A (en) |
WO (1) | WO2005101693A1 (en) |
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Also Published As
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CN1943137A (en) | 2007-04-04 |
US7636566B2 (en) | 2009-12-22 |
EP2230776A3 (en) | 2012-07-25 |
US20100048201A1 (en) | 2010-02-25 |
EP2230776A2 (en) | 2010-09-22 |
EP1738491A1 (en) | 2007-01-03 |
US20050239403A1 (en) | 2005-10-27 |
US8055257B2 (en) | 2011-11-08 |
EP1738491B1 (en) | 2013-06-12 |
CN1943137B (en) | 2012-05-30 |
MXPA06011764A (en) | 2006-12-15 |
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