최소 단어 이상 선택하여야 합니다.
최대 10 단어까지만 선택 가능합니다.
다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
NTIS 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
DataON 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Edison 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0000799 (2001-12-04) |
발명자 / 주소 |
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출원인 / 주소 |
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인용정보 | 피인용 횟수 : 174 인용 특허 : 216 |
A cellular communications system comprising a space based system comprising a first set of cells, and a ground based system comprising a second set of cells. The space and ground systems can optionally function substantially autonomously, with each using spectrum from at least one predetermined freq
A cellular communications system comprising a space based system comprising a first set of cells, and a ground based system comprising a second set of cells. The space and ground systems can optionally function substantially autonomously, with each using spectrum from at least one predetermined frequency band.
1. A cellular communications system, comprising:a space based system comprising at least one satellite, each satellite comprising at least one antenna and establishing a first set of cells and transmitting and receiving Global System for Mobile Communications (GSM) based waveforms using at least a f
1. A cellular communications system, comprising:a space based system comprising at least one satellite, each satellite comprising at least one antenna and establishing a first set of cells and transmitting and receiving Global System for Mobile Communications (GSM) based waveforms using at least a first portion of at least one predetermined frequency band used by the first set of cells; a ground based system comprising at least one base transceiver station (BTS), each BTS establishing a second set of cells and transmitting and receiving GSM based waveforms utilizing at least a second portion of the one predetermined frequency band, said space based and ground based systems functioning substantially autonomously and at least one of using and reusing at least a portion of spectrum from the same at least one predetermined frequency band to be used as at least one of an uplink and downlink frequency channel from any of the frequencies within the at least one predetermined frequency band; at least one subscriber terminal communicating with at least one of said space based system and with said ground based system when located in at least one of the first and second set of cells; and at least one radio resource manager (RRM) determining available communication links between said at least one subscriber terminal and at least one of said space based system and said ground based system. 2. The system according to claim 1, wherein said at least one predetermined frequency band comprises at least one discrete space based system uplink portion and at least one discrete space based system downlink portion, wherein said ground based system uses and/or reuses at least a portion of at least one of the uplink and downlink portions.3. The system according to claim 1, wherein each of the discrete portions are associated with at least one of a satellite spot beam and a subsection of a spot beam.4. The system according to claim 1, wherein the at least one predetermined frequency band comprises at least one discrete space based system uplink portion, at least one discrete space based system downlink portion, and at least ground based system portion.5. The system according to claim 1, wherein at least two cells of the first set of cells in said space based system use a mutually exclusive portion of the first portion of the at least one predetermined frequency band.6. The system according to claim 1, wherein one or more frequencies in the first and second portion of the at least one predetermined frequency band used by said space based system and said ground based system are substantially the same or closely spaced.7. The system according to claim 1, wherein said at least one subscriber terminal comprises at least a first vocoder having a first data rate and at least a second vocoder having a second data rate, wherein the at least a first vocoder is used when said at least one subscriber terminal is communicating with said space based system, and wherein the at least a second vocoder is used when said at least one subscriber terminal is communicating with said ground based system.8. The system according to claim 7, wherein said RRM at least one of assigns and activates at least one of the first and second vocoders in response to predetermined criteria.9. The system according to claim 8, wherein the predetermined criteria comprise at least one of capacity demand, voice quality, and received signal level.10. The system according to claim 8, further comprising at least one mobile switching center operatively connected to said space based system and said ground based system that at least one of assigns or activates a vocoder in response to predetermined criteria comprising capacity demand, voice quality, and received signal level.11. The system according to claim 8, wherein said RRM further assigns or activates a different vocoder to a voice communications circuit in response to the predetermined criteria.12. The system according to claim 11, wherein the predetermined criteria comprises at least one of capacity demand, voice quality, signal strength, and received signal level having changed substantially since assignment or activation of the at least first and second vocoder being utilized.13. The system according to claim 1, wherein the at least one predetermined frequency band comprises first and second frequency bands, and wherein said at least one subscriber terminal communicates with said ground based system by transmitting at first frequencies within the first frequency band used as an uplink of said space based system, and receives at second frequencies within the second frequency band used as a downlink of said space based system.14. The system according to claim 13, wherein the first and second frequencies used by a cell of said space based system are mutually exclusive to third frequencies used by a cell of said ground based system containing one or more of said at least one subscriber terminal, within the cell of said space based system.15. The system according to claim 1, wherein the at least one predetermined frequency band comprises first and second frequency bands, and wherein said at least one subscriber terminal communicates with said ground based system by transmitting at first frequencies within a first frequency band used as a downlink of said space based system, and receiving at second frequencies within a second frequency band used as an uplink of said space based system.16. The system according to claim 15, wherein the first and second frequencies used by a cell of said space based system are mutually exclusive to third frequencies used by a cell of said ground based system containing one or more of said at least one subscriber terminal, within the cell of said space based system.17. The system according to claim 1, wherein the at least one predetermined frequency band comprises first and second frequency bands, and wherein said at least one subscriber terminal communicates with said at least one ground based system by transmitting at first frequencies within the first frequency band used as the uplink of said space based system, and receives at frequencies within the first frequency band used as the uplink of said space based system.18. The system according to claim 17, wherein the first and second frequencies used by a cell of said space based system are mutually exclusive to third frequencies used by a cell of said ground based system containing one or more of said at least one subscriber terminal, within the cell of said space based system.19. The system according to claim 1, wherein the at least one predetermined frequency band comprises first and second frequency bands, and wherein said at least one subscriber terminal communicates with said at least one ground based system by transmitting at first frequencies within the first frequency band used as the downlink of said space based system, and receives at frequencies within the first frequency band used as the downlink of said space based system.20. The system according to claim 19, wherein the first and second frequencies used by a cell of said space based system are mutually exclusive to third frequencies used by a cell of said ground based system containing one or more of said at least one subscriber terminal, within the cell of said space based system.21. The system according to claim 1, wherein each of said at least one RRM monitors which channels are currently being utilized by said at least one subscriber terminal.22. The system according to claim 21, further comprising a mobile switching center (MSC) operatively connected to one or more of said at least one RRM, wherein one or more of said at least one RRM indicates to said MSC which channels are currently being utilized by each of one or more subscriber terminals.23. The system according to claim 22, wherein each of said at least one RRM comprises a spectrum analyzer.24. The system according to claim 1, wherein said at least one RRM comprises first and second RRMs, and wherein a first RRM is utilized in connection with said ground based system, and wherein a second RRM is utilized in connection with said space based system.25. The system according to claim 24, wherein said first and second RRMs monitor inband interference and avoid using and/or reusing channels that would cause levels of interference exceeding a predetermined threshold.26. The system according to claim 25, wherein said first and second RRMs further monitor at least one of received signal quality and available link margin from said at least one subscriber terminal.27. The system according to claim 26, wherein at least one of said first and second RRMs execute utilization of a different communications channel when a quality measure of the existing communications channel has fallen below a predetermined level or has fallen below a predetermined link margin.28. The system according to claim 1, wherein said at least one subscriber terminal comprises at least one of a variable rate vocoder and two or more vocoders each having a different data rate.29. The system according to claim 28, wherein said at least one subscriber terminal uses a vocoder data rate as determined by predetermined criteria.30. The system according to claim 29, wherein the predetermined criteria comprises at least one of capacity demand, voice quality, signal strength, and received signal level.31. The system according to claim 1, wherein said RRM further monitors inband interference and avoids using channels containing levels of interference exceeding a predetermined threshold.32. The system according to claim 31, wherein said RRM further monitors received signal quality from subscriber terminals communicating with at least one of said space based system and said ground based system.33. The system according to claim 31, wherein said RRM further monitors available link margin from subscriber terminals communicating with at least one of said space based system and said ground based system.34. The system according to claim 31, wherein said RRM executes utilization of a different communications channel when a quality measure of the existing communications channel has fallen below a predetermined level or has fallen below a predetermined link margin.35. The system according to claim 1, further comprising a network operations controller (NOC) operatively connected to at least a mobile switching center that assigns a channel to subscriber units, said NOC maintaining cognizance of the availability of at least one of satellite and terrestrial resources and administering at least one of reconfiguration, assignment and reuse of frequencies within said predetermined frequency band to meet changed traffic patterns or other predetermined conditions.36. The system according to claim 35, wherein said NOC is commonly shared between and operatively connected to said space based system and said ground based system.37. The system according to claim 35, wherein said NOC utilizes past system traffic patterns in the reconfiguration, assignment and reuse of the frequencies.38. The system according to claim 35, wherein said NOC utilizes at least one of hysteresis and negative hysteresis in the reconfiguration, assignment and/or reuse of the frequencies.39. The system according to claim 35, wherein said space based system further comprises a satellite having a geostationary orbit, and wherein said NOC dynamically assigns a channel to a subscriber unit communicating with said space based system.40. The system according to claim 39, wherein the dynamic assignment is performed on a call-by-call basis.41. The system according to claim 39, wherein the dynamic assignment is performed based on past and present usage.42. The system according to claim 39, wherein the dynamic assignment is performed by one or more base station controllers operationally connected to said NOC.43. The system according to claim 35, wherein said space based system further comprises a satellite having a geostationary orbit, and wherein said NOC assigns channels to a subscriber unit communicating with said space based system in accordance with a predetermined channel assignment scheme.44. The system according to claim 35, wherein said space based system further comprises a satellite having a geostationary orbit, and wherein one or more base station controllers assign channels to a subscriber unit communicating with said space based system in accordance with a predetermined channel assignment scheme.45. A cellular communications system, comprising:a space based system comprising at least one satellite, each satellite comprising at least one antenna and establishing a first set of cells and transmitting and receiving Global System for Mobile Communications (GSM) based waveforms using at least a first portion of at least one predetermined frequency band used by the first set of cells; a ground based system comprising at least one base transceiver station (BTS), each BTS establishing a second set of cells and transmitting and receiving code division multiple access (CDMA) waveforms utilizing at least a second portion of the same at least one predetermined frequency band, said space based and ground based systems functioning substantially autonomously and said space based system at least one of using and reusing at least a portion of spectrum from the same at least one predetermined frequency band to be used as at least one of an uplink and downlink frequency channel from any of the frequencies within the at least one predetermined frequency band; at least one subscriber terminal communicating with at least one of said space based system and with said ground based system when located in at least one of the first and second set of cells; and at least one radio resource manager (RRM) determining available communication links between said at least one subscriber terminal and at least one of said space based system and said ground based system. 46. The system according to claim 45, wherein the first portion comprises at least one discrete space based system uplink portion and at least one discrete space based system downlink portion, and wherein the first portion is a subset of the second portion.47. The system according to claim 46, wherein each of the discrete portions are associated with at least one of a satellite spot beam and a subsection of a spot beam.48. The system according to claim 45, wherein the first portion of said at least one predetermined frequency band comprises at least one discrete space based system uplink portion, at least one discrete space based system downlink portion, and a ground based system portion.49. The system according to claim 45, wherein at least two cells of the first set of cells in said space based system use a mutually exclusive portion of the first portion of the at least one predetermined frequency band.50. The system according to claim 45, wherein one or more frequencies in the first and second portion of the at least one predetermined frequency band are substantially the same or closely spaced.51. The system according to claim 45, wherein said at least one subscriber terminal comprises at least a first vocoder having a first data rate and at least a second vocoder having a second data rate, wherein the at least a first vocoder is used when said at least one subscriber terminal is communicating with said space based system, and wherein the at least a second vocoder is used when said at least one subscriber terminal is communicating with said ground based system.52. The system according to claim 51, wherein said RRM at least one of assigns and activates at least one of the first and second vocoders in response to predetermined criteria.53. The system according to claim 52, wherein the predetermined criteria comprise at least one of capacity demand, voice quality, and received signal level.54. The system according to claim 52, further comprising at least one mobile switching center operatively connected to said space based system and said ground based system that at least one of assigns or activates a vocoder in response to predetermined criteria comprising at least one of capacity demand, voice quality, and received signal level.55. The system according to claim 52, wherein said RRM further assigns or activates a different vocoder to a voice communications circuit in response to the predetermined criteria.56. The system according to claim 55, wherein the predetermined criteria comprises at least one of capacity demand, voice quality, signal strength, and received signal level having changed substantially since assignment or activation of the at least first and second vocoder being utilized.57. The system according to claim 45, wherein each of said at least one RRM monitors which channels are currently being utilized by said at least one subscriber terminal.58. The system according to claim 57, further comprising a mobile switching center (MSC) operatively connected to one or more of said at least one RRM, wherein one or more of said at least one RRM indicates to said MSC which channels are currently being utilized by each of one or more subscriber terminals.59. The system according to claim 58, wherein each of said at least one RRM comprises a spectrum analyzer.60. The system according to claim 57, wherein said at least one RRM comprises first and second RRMs, and wherein a first RRM is utilized in connection with said ground based system, and wherein a second RRM is utilized in connection with said space based system.61. The system according to claim 60, wherein said first and second RRMs monitor inband interference and avoid using and/or reusing channels that would cause levels of interference exceeding a predetermined threshold.62. The system according to claim 61, wherein said first and second RRMs further monitor at least one of received signal quality and available link margin from said at least one subscriber terminal.63. The system according to claim 62, wherein at least one of said first and second RRMs execute utilization of a different communications channel when a quality measure of the existing communications channel has fallen below a predetermined level or has fallen below a predetermined link margin.64. The system according to claim 45, wherein said at least one subscriber terminal comprises at least one of a variable rate vocoder and two or more vocoders each having a different data rate.65. The system according to claim 64, wherein said at least one subscriber terminal uses a vocoder data rate as determined by predetermined criteria.66. The system according to claim 65, wherein the predetermined criteria comprises at least one of capacity demand, voice quality, signal strength, and received signal level.67. The system according to claim 45, wherein said RRM further monitors inband interference and avoids using channels containing levels of interference exceeding a predetermined threshold.68. The system according to claim 67, wherein said RRM further monitors received signal quality from subscriber terminals communicating with at least one of said space based system and said ground based system.69. The system according to claim 67, wherein said RRM further monitors available link margin from subscriber terminals communicating with at least one of said space based system and said ground based system.70. The system according to claim 67, wherein said RRM executes utilization of a different communications channel when a quality measure of the existing communications channel has fallen below a predetermined level or has fallen below a predetermined link margin.71. The system according to claim 45, further comprising a network operations controller (NOC) operatively connected to at least a mobile switching center that assigns a channel to subscriber units, said NOC maintaining cognizance of the availability of at least one of satellite and terrestrial resources and administering at least one of reconfiguration, assignment and reuse of frequencies within the predetermined frequency band to meet changed traffic patterns or other predetermined conditions.72. The system according to claim 71, wherein said NOC is commonly shared between and operatively connected to said space based system and said ground based system.73. The system according to claim 71, wherein said NOC utilizes past system traffic patterns in the reconfiguration, assignment and reuse of the frequencies.74. The system according to claim 71, wherein said NOC utilizes at least one of hysteresis and negative hysteresis in the reconfiguration, assignment and/or reuse of the frequencies.75. The system according to claim 71, wherein said space based system further comprises a satellite having a geostationary orbit, and wherein said NOC dynamically assigns a channel to a subscriber unit communicating with said space based system.76. The system according to claim 75, wherein the dynamic assignment is performed on a call-by-call basis.77. The system according to claim 75, wherein the dynamic assignment is performed based on past and present usage.78. The system according to claim 75, wherein the dynamic assignment is performed by one or more base station controllers operationally connected to said NOC.79. The system according to claim 71, wherein said space based system further comprises a satellite having a geostationary orbit, and wherein said NOC assigns channels to a subscriber unit communicating with said space based system in accordance with a predetermined channel assignment scheme.80. The system according to claim 71, wherein said space based system further comprises a satellite having a geostationary orbit, and wherein one or more base station controllers assign channels to a subscriber unit communicating with said space based system in accordance with a predetermined channel assignment scheme.81. A method of assigning to a requesting subscriber unit a communication channel commonly shared between a space based communication system and a ground based communication system, comprising the steps of:configuring a first satellite spot beam, associated with the space based system, having a plurality of communication channels associated therewith; configuring at least one terrestrial cell, associated with the ground based system, that at least partially geographically overlaps the first satellite spot beam; requesting by a dual mode subscriber terminal a communication channel; at least one of the ground based system and the space based system substantially autonomously determining channel availability; and assigning to the requesting dual mode subscriber unit at least one of an unused channel and, for reuse with the dual mode subscriber terminal, a used channel having a sufficiently weak signal strength. 82. The method according to claim 81, wherein the space based system uses a time division multiple access (TDMA) air interface and the ground based system uses a TDMA air interface.83. The method according to claim 81, wherein the space based system uses a first air interface, and the ground based system uses a second air interface.84. The method according to claim 83, wherein the first air interface is at least one of a Global System for Mobile Communications (GSM) based air interface and a derivative thereof, and the second air interface is at least one of a GSM based air interface and a derivative thereof.85. The method according to claim 83, wherein the first air interface is at least one of a Global System for Mobile Communications (GSM) based air interface and a derivative thereof, and the second air interface is at least one of a code division multiple access (CDMA) based air interface and a derivative thereof.86. The method according to claim 83, wherein the first air interface is at least one of a code division multiple access (CDMA) based air interface and a derivative thereof, and the second air interface is at least one of a Global System for Mobile Communications (GSM) based air interface and a derivative thereof.87. The method according to claim 83, wherein the first air interface is at least one of a code division multiple access (CDMA) based air interface and a derivative thereof, and the second air interface is at least one of a CDMA based air interface and a derivative thereof.88. The method according to claim 83, further comprising the step of increasing the output power of a subscriber terminal utilizing the space based system as the composite signal strength of the subscriber terminals utilizing the ground based system reaches a predetermined threshold.89. The method according to claim 88, further comprising the step of decreasing the number of subscriber terminals connections with the ground based system as at least one of bit error rate, received signal strength, available link margin, and voice quality reach respective predetermined thresholds.90. The method according to claim 81, further comprising the steps of:enabling a subscriber terminal to communicate at a plurality of data rates; and selecting a data rate as determined by at least one of capacity demand, voice quality, and subscriber terminal received signal level. 91. The method according to claim 90, further comprising the step of communicating, by the subscriber terminal, with the space based system or the ground based system using a different data rate as determined by at least one of capacity demand, and received signal level having changed substantially since assignment or activation of the current channel.92. The method according to claim 81, wherein the channel comprises first and second frequency bands, and wherein the subscriber terminal communicates with the ground based system by transmitting at first frequencies within the first frequency band used as an uplink of the space based system, and receiving at second frequencies within the second frequency band used as a downlink of the space based system.93. The method according to claim 81, wherein the channel comprises first and second frequency bands, and wherein the subscriber terminal communicates with the ground based system by transmitting at first frequencies within a first frequency band used as an uplink of the space based system, and receiving at second frequencies within a second frequency band used as a downlink of the space based system.94. The method according to claim 81, wherein the channel comprises first and second frequency bands, and wherein the subscriber terminal communicates with the ground based system by transmitting at first frequencies within a first frequency band used as the uplink of the space based system, and receiving at first frequencies within the first frequency band used as the uplink of the space based system.95. The method according to claim 81, wherein the channel comprises first and second frequency bands, and wherein the subscriber terminal communicates with the ground based system by transmitting at first frequencies within a first frequency band used as the downlink of the space based system, and receiving at first frequencies within the first frequency band used as the downlink of the space based system.96. The method according to claim 81, wherein a first communication channel associated with the space based system comprises a first frequency band used for uplink communication and a second frequency band used for uplink communication, and wherein the ground based system shares at least a common portion of the first and second frequency bands in a terrestrial cell positioned outside of and non-overlapping with the satellite spot beam.97. The method according to claim 81, further comprising the step of at least one of the ground based system and the space based system autonomously monitoring inband interference and avoiding use and/or reuse of channels that would cause levels of interference exceeding a predetermined threshold.98. The method according to claim 97, further comprising the step of utilizing a different communications channel when a quality measure of the existing communications channel has fallen below a predetermined level.99. The method according to claim 81, further comprising the step of at least one of the space based system and the ground based system autonomously monitoring at least one of received signal quality and available link margin from a subscriber terminal.100. The method according to claim 99, further comprising the step of utilizing a different communications channel when at least one of received signal quality and available link margin has fallen below a predetermined link margin.101. The method according to claim 81, further comprising the step of arranging for at least one of channel reconfiguration and reuse of frequencies to meet changed traffic patterns.102. The method according to claim 101, wherein past system traffic patterns are utilized in the reconfiguration and reuse of frequencies.103. The method according to claim 101, wherein at least one of hysteresis and negative hysteresis are utilized in determining the reconfiguration and reuse of frequencies.104. The method according to claim 81, wherein the communication channel is assigned to the subscriber unit in accordance with a predetermined channel assignment scheme.105. In a cellular communications system comprising a space based system comprising a first set of cells, and a ground based system comprising a second set of cells, in which at least a portion of the second set of cells share a common geographic area and have at least a portion of overlapping geographic coverage with the first set of cells, the space based and ground based systems functioning substantially autonomously and each using one or more mutually exclusive predetermined frequency bands, a method for initiating a call between a subscriber terminal and at least one of the space based system and the ground based system, comprising the steps of:a subscriber terminal transmitting to the system a signal indicating whether it is a single or dual mode terminal; determining by the system based on at least the transmitted signal whether the subscriber terminal is a single mode or a dual mode terminal; and for a dual mode subscriber terminal, at least one of assigning to the ground based system for use with the dual mode subscriber terminal an unused space based system channel, using in the ground based system an unused ground based system channel, reusing in the ground based system a channel used by the space based system having a substantially weak signal relative to the dual mode subscriber terminal, and using in the space based system a channel assigned to the space based system; and for a single mode subscriber terminal: using in the space based system an available channel having an acceptable signal strength. 106. In a cellular communications system comprising a space based system comprising a first set of cells, and a ground based system comprising a second set of cells, in which at least a portion of the second set of cells share a common geographic area and have at least a portion of overlapping geographic coverage with the first set of cells, the space based system and the ground based system share and commonly use at least a portion of a predetermined frequency band, and in which the space based and ground based systems function substantially autonomously, a method for initiating a call between a subscriber terminal and at least one of the space based system and the ground based system, comprising the steps of:a subscriber terminal transmitting to the system a signal indicating whether it is a single or dual mode terminal; determining by the system based at least one the transmitted signal whether the subscriber terminal is a single mode or a dual mode terminal; and for a dual mode subscriber terminal, at least one of using an unused channel to establish communication between the ground based system and the dual mode subscriber terminal, reusing in the ground based system a channel used by the space based system having a substantially weak signal relative to the subscriber terminal to establish communication between the ground based system and the dual mode subscriber terminal, and reusing in the ground based system a channel used by the ground based system having a substantially weak signal relative to the subscriber terminal to establish communication between the ground based system and the dual mode subscriber terminal; and for a single mode subscriber terminal: using in the space based system an available channel having an acceptable signal strength.
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