CA2194568A1 - Airborne radiotelephone communications system - Google Patents
Airborne radiotelephone communications systemInfo
- Publication number
- CA2194568A1 CA2194568A1 CA002194568A CA2194568A CA2194568A1 CA 2194568 A1 CA2194568 A1 CA 2194568A1 CA 002194568 A CA002194568 A CA 002194568A CA 2194568 A CA2194568 A CA 2194568A CA 2194568 A1 CA2194568 A1 CA 2194568A1
- Authority
- CA
- Canada
- Prior art keywords
- airborne
- signals
- radio
- radiotelephone
- base station
- Prior art date
- Legal status (The legal status 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 status listed.)
- Abandoned
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
-
- 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
- H04B7/18502—Airborne stations
- H04B7/18506—Communications with or from aircraft, i.e. aeronautical mobile service
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/06—Airborne or Satellite Networks
Abstract
The airborne radio communications system of the present invention enables an airborne radio to communicate with the ground based cellular radiotelephone system. The present invention also enables the ground based system to keep track of the location of the airborne radiotelephone and page it when a call from the ground based telephone system is received. The ground base station is connected to upward radiating antennas that form airborne cells. As the aircraft with the radio flies through the airborne cells, the airborne relay receives the signals from the base station and relays them to the radio. If the radio is transmitting signals, the relay transmits those signals, through the airborne cells, to the base station. As the aircraft moves from cell to cell, the radio is handed off to the next cell to maintain communications with the ground.
Description
wo 96/02093 2 1 9 ~ ~ ~ 8 r~ , ;07 .
AIRBORNE RADIOTELEPHONE COMMUNICATIONS SYSTEM
BACKGROUND OF TH[E INVENTION
5 I. FIELD OF T~E INVEN~ON
The present invention relates to the field of commnnic~tinn.c More particularly, the present invention relates to cellular radiotelephone cnmmnnicatinnq between an airplane and a ground based station.
II. DESCRIPrlON OF T~E RELATED ART
Present commnnic~ti~n~ technology enables aircraft passengers to make telephone calls to anywhere in the world from any properly 15 equipped airplane. Large airline-type aircraft as well as smaller general aviation-type aircraft can be equipped with the ra~liu~ l,r ,r~
A rnrlirt-'~phnne con~c~ ion i9 typically ~rr~Tnr~ d by first entering the telephone number to be called as well as credit card i ~ ~ r~ to pay for the call. The rS~ r~ - then connects with one ao of 70 - 80 r~intol~FhnnP base stations, also known as cells, on the ground.
The cell to which it connects depends on to which base station the aircraft is closest when the call is initiated. The cells, each connected to the public switched t~le~ hu.le network (PSTN), cover most of the c....1....~ 1 United States, thus allowing a telephone call to be initiated from an aircraft 26 almost anywhere.
Aircraft radiotelephones, however, e~cperience a number of problems. First, the aircraft based r~rlintolephnno does not register in the ground based system. The ground based system, therefore, does not know the location of the aircraft radiotelephone. This restricts the aircraft 30 rarliot~lorhonr- to initiating calls; it cannot receive calls since the ground system does not know where to forward calls.
Another problem is that the aircraft radiotelephone system does not perform hand-offs between cells as is done in ground based cellular r~lintolPphnrl~ gystems when the r~intohophnno reaches the edge of the 35 cell. This results in the call from the aircraft radiotelephone being dropped when the aircraft reaches the limit of the cell's coverage. There is a resulting need for an airborne r~-lio~olorhnno system that is ~nmr~tihho with the ground based cellular r~rliotokophnno system. In other words, an airborne radiot~le~hnDe system is needed that enables ground initiated wog6~020s3 2 ~ ~45 ~}8 telephone calls to be received by the airborne r~liot~lPrhnr\e in addition to the call from the airborne radiotPlPrhnnP being handed off to the next cell as it reaches the edge of the cell's coverage.
SUMMARY OF T~ INvENTIoN
The system of the present invention encompasses an airborne communications system having a ground based subsystem and an airborne based bul)D.~DL~. The airborne based subsystem includes a radio 10 for transmitting and receiving radio signals and an airborne radio repeater for relaying the radio signals from the airborne radio to the ground based subsystem. The radio repeater also relays radio signals from the ground based subsystem to the airborne radio. The ground based subsystem includes a base station that is coupled to a public switched 15 telephone network (PSTN) for tr~nqmitting PSTN ~ P~1 signals and receiving relayed radio signals. The base station has at least one upward radiating antenna for l~ ..g and receiving the radio signals.
BRIEF DESCRlPTloN OF T3EIE DRAWINGB
FIG. 1 shows the airborne r~rlintplpphnnp commnni~tinnc system of the present invention.
E'IG. 2 shows the airborne based DUbD~DLD~ of the present inven-tion.
FIG. 3 shows a flowchart of the process of the present invention.
FIG. 4 shows a block diagram of an alternate PmhoAimpnt of the present invention.
DETAILED DESCRIPTION OF TEE Pl~ uRomT R~T
3~
The airborne r~ t~l.orhnnP communication system of the present invention is illustrated in FIG. 1. This system is comprised of two subsystems: the ground based SUI~DYDL~ U (105) and the airborne based DU~DyDL~:~II (125).
~5 The ground based subsystem (105), in the preferred Pmho~imPnt is the code division multiple access (CDMA) cellular r~ t~lephnnP system.
An alternate PmhoflimPnt uses the time division multiple access system.
Another alternate Pmhollimpnt uses the present advanced mobile phone system (AMPS). A typical CDMA r~.' t l~phnnP system is discussed in wo 96/02093 2 1 9 ~ 5 6 8 r~l,o~ C ~ -~7 greater detail in U.S. Patent No. 4,901,307 to (~TilhollqPn et al. and assigned to Qualcomm, Inc.
The ground based radiotelephone system is comprised of a base station (120), also known as a cell site, coupled to a mobile switching 5 center (115) that is coupled to the public switched telephone network (PSTN) (110). The base station (120) communicates with the mobile radiotelephones and switches the signals from the radiotPlephnnP.c to the mobile switching center (116). The base station (120) also provides the proper channels to the radiot~lephnnP, thus enabling communication 10 with the base station. The mobile switching center (115) switches the signals iiom the base station (120) to the PSTN (110) and vice versa.
Each base station (120) is coupled to an antenna (150) that receives and radiates the CDMA radiotelephone signals. In the preferred (.mhoAimPnt, the antenna (150) is identical to typical cell site antennas 15 that are well known to one skilled in the art. An alternate PmhoAimPnt uses an antenna that radiates upward. This upward radiation forms a cell that is elevated above the ground allowing the airborne ra-lin~lPrhnnP
to travel through the elevated cells in the same manner that a mobile radiotalephone on the ground travels through terrestrial cells. An ~) antenna that forms this type of elevated cell is a typical directional antenna that is well known in the art.
A block diagram of the airborne based subsystem of the present invention is illustrated in FIG. 2. This subsystem uses a CD~ type radiotPlephnnP (205) to communicate with a radiot~lPphAne signal 25 repeater (210), having an antenna, that is located in the aircraft. In the preferred Pmho~imPnt~ the repeater (210) also has an amplifier to increase the signal's gain that is being rnmmnnir~ted to the repeater.
The repeater (210) receives the signals from the individual r~AiotnlPrhnrlP~ (205) within the aircraft and relays them to an antenna ~0 (215) mounted on the outside of the aircraft. The outside antenna (215) relays the signals to the base station on the ground. This subsystem may ~ have a single radiotelephone, as in a small aircraft, or multiple r~Aio~ rhnnP~ as in an airline size aircraft.
The airborne subsystem also operates in the reverse direction.
35 Telephone calls from the PSTN to the base station on the ground are tr~m -: ~ to the outside antenna (215) that relays them to the repeater (210) mounted in the aircraft. The repeater's antenna rnmmllni~tP~ the signal to the proper radiotelephone (205) in the aircraft. The rnAiotrl~rhnnP~ (205) APtPrminP which signal is to be decoded by the wo s6/ozog3 2 1 q 4 5 6 8 .
process described in G~lhousen et al. and in the Telecommunications Industries Association/Electronic Industries Association Interim Standard 95 (TIA/EIA/IS-95).
In an alternate PnnhorlimPnt, the radiotelephone signal repeater is 5 replaced by an airborne base station that has the ability to register the radiotf-lPphnnP.c on the aircraft. The airborne base station then registers the radiotelephone with the ground based subsystem. This base station has the same fi1nr~tinnnlity of its ground-based counterpart but on a much smaller scale since it does not have to handle the thousands of 10 radiotelerhnnf-c of the ground-based station.
The airborne commllnir~tinnR system of the present invention operates in a similar way to the ground based CDMA radiotelephone syHtem discussed in G~lhousen et al. A flowchart of this operation is illustrated in FIG. 3.
The process begins by the airborne repeater registering the rnrlifl -' 3, L - with the nearest cell site (301). This is nr~ .f-d in thesame manner as a terrestrial rarliotPlephnnrJ registers with the ground based rnfliotPlPrhnnP system; the repeater searches for the strongest pilot signal and registers with that cell. This registration proce_s involves the 20 radiot~l~rhnnP's tplpphnnp number and ele.,llunic Herial number being trnn~nnitted to the base station. The registration process is described in greater detail in U.S. Patent No. 5,289,527 to liPflPmnnn and assigned to Qll 11 comm Inc.
The r~fliot~lerhnnP or ground-based land-line telephone system can now initiate a call (310). The call from the r~rlint~lpphnrlp is received by the airborne repeater and amplified (320) before being Lr~ d to the ground base station. The ground base station then transmits the call to the mobile switching center that routes the call to the PSTN where it is then rnnnprtel1 to the called telephone number (325).
The signals from the PSTN to the airborne radiotelephone are routed in the reverse of the r~rlintolerhnnp initiated call. The mobile switching center switches the call to the base station to which the rnlliot~l~phnnP is registered. The base station then transmits the signal (325) to the airborne external antenna that relays it to the aircraft repeater (320). The repeater amplifies it and transmits the amplifier signal to the rS~flint''l, L A in the aircraft.
The present invention also enables a ground telephone or r~iot~lPphnnP to contact an airborne rn~int~lPrhnnp Since the repeater has ~ O ' ~ d the airborne r~rli~ h .f with the proper ground base WO96102093 2~94568 ~ 7 station, the mobile switching center knows to which base station the call is to be routed. Once the call is routed to the proper base station it is transmitted to the airborne repeater which then amplifies the call and transrnits it to the r~liotolPrhnnP~ on the aircraft. As discussed above, the 5 radiotPlPph--nPs then ~lPtorminp which signal is to be decoded.
Another benefit of the present invention is the hand-off capability.
Once the aircraft reaches the fringe of the present cell site, the radiotolephnnP begins the hand-off process described in ~iedem~nn. The signals from the ground base stations are received by the external 10 antenna of the airborne subsystem and repeated to the radiotelephones.
This enables the r~ ntolPphnnP~ to search for the strongest pilot signal of the next cell and register with that base station. The determining factor on when the quality of the pilot signal has been reduced to the point that a hand-off is required is when the pilot signal drops a predetermined 15 amount. This amount may be different for every system and is set to optimize the system p~.ru....2~llce.
In the alternate Pmho~imPnt~ the airborne repeater is replaced by a base station-type unit that registers the radiot~lephnnp aboard the aircraft. A block diagram of the airborne base station is illustrated in 30 FIG. 4. Once the rQ-liotelPphnne is registered with the aircraft base station, the aircraft base station then searches for the strongest pilot signal from a ground base shtion and registers with that base station.
Referring to FIG. 4, the airborne base station is comprised of a number of base station transceivers (410) that are the link between the 25 rQ~liot~'nrhnnP and the base station. The CDMA h~L~.~.u~__l subsystem (415) routes the signals betveen the tl~sc~ (410) and the rest of the base station. The call control processor (420) controls signaling with the radiotPlPphnnP~, controls all call processing, and allocates the base station resources. The time and L~t~uu~l(.J unit (430) provides the timing 30 and rl -du,u. .1~.~ signals for the base station. The base station manager (435) performs initiQli7Qtinn~ configuration, and p~ ru~luar~ management of ~ the base station. And finally, the selector bank subsystems (440) processes and formats the data between the ground base stations and the ~ rQ-lintolPphnnP The selector bank subsystems (440) are cnnnPcted to the 35 aircraft's external antenna (315) to receive and radiate the rQ~ olPrhnnP
signals.
Other embo~limPnt~ using the airborne base station may have different ~-....p...~ and different features. A base station that simply wo s6/020s3 2 1 q 4 5 6 8 I ~
registers the radiotelephone and relays this registration to the ground base station is also within the scope of the present invention.
AIRBORNE RADIOTELEPHONE COMMUNICATIONS SYSTEM
BACKGROUND OF TH[E INVENTION
5 I. FIELD OF T~E INVEN~ON
The present invention relates to the field of commnnic~tinn.c More particularly, the present invention relates to cellular radiotelephone cnmmnnicatinnq between an airplane and a ground based station.
II. DESCRIPrlON OF T~E RELATED ART
Present commnnic~ti~n~ technology enables aircraft passengers to make telephone calls to anywhere in the world from any properly 15 equipped airplane. Large airline-type aircraft as well as smaller general aviation-type aircraft can be equipped with the ra~liu~ l,r ,r~
A rnrlirt-'~phnne con~c~ ion i9 typically ~rr~Tnr~ d by first entering the telephone number to be called as well as credit card i ~ ~ r~ to pay for the call. The rS~ r~ - then connects with one ao of 70 - 80 r~intol~FhnnP base stations, also known as cells, on the ground.
The cell to which it connects depends on to which base station the aircraft is closest when the call is initiated. The cells, each connected to the public switched t~le~ hu.le network (PSTN), cover most of the c....1....~ 1 United States, thus allowing a telephone call to be initiated from an aircraft 26 almost anywhere.
Aircraft radiotelephones, however, e~cperience a number of problems. First, the aircraft based r~rlintolephnno does not register in the ground based system. The ground based system, therefore, does not know the location of the aircraft radiotelephone. This restricts the aircraft 30 rarliot~lorhonr- to initiating calls; it cannot receive calls since the ground system does not know where to forward calls.
Another problem is that the aircraft radiotelephone system does not perform hand-offs between cells as is done in ground based cellular r~lintolPphnrl~ gystems when the r~intohophnno reaches the edge of the 35 cell. This results in the call from the aircraft radiotelephone being dropped when the aircraft reaches the limit of the cell's coverage. There is a resulting need for an airborne r~-lio~olorhnno system that is ~nmr~tihho with the ground based cellular r~rliotokophnno system. In other words, an airborne radiot~le~hnDe system is needed that enables ground initiated wog6~020s3 2 ~ ~45 ~}8 telephone calls to be received by the airborne r~liot~lPrhnr\e in addition to the call from the airborne radiotPlPrhnnP being handed off to the next cell as it reaches the edge of the cell's coverage.
SUMMARY OF T~ INvENTIoN
The system of the present invention encompasses an airborne communications system having a ground based subsystem and an airborne based bul)D.~DL~. The airborne based subsystem includes a radio 10 for transmitting and receiving radio signals and an airborne radio repeater for relaying the radio signals from the airborne radio to the ground based subsystem. The radio repeater also relays radio signals from the ground based subsystem to the airborne radio. The ground based subsystem includes a base station that is coupled to a public switched 15 telephone network (PSTN) for tr~nqmitting PSTN ~ P~1 signals and receiving relayed radio signals. The base station has at least one upward radiating antenna for l~ ..g and receiving the radio signals.
BRIEF DESCRlPTloN OF T3EIE DRAWINGB
FIG. 1 shows the airborne r~rlintplpphnnp commnni~tinnc system of the present invention.
E'IG. 2 shows the airborne based DUbD~DLD~ of the present inven-tion.
FIG. 3 shows a flowchart of the process of the present invention.
FIG. 4 shows a block diagram of an alternate PmhoAimpnt of the present invention.
DETAILED DESCRIPTION OF TEE Pl~ uRomT R~T
3~
The airborne r~ t~l.orhnnP communication system of the present invention is illustrated in FIG. 1. This system is comprised of two subsystems: the ground based SUI~DYDL~ U (105) and the airborne based DU~DyDL~:~II (125).
~5 The ground based subsystem (105), in the preferred Pmho~imPnt is the code division multiple access (CDMA) cellular r~ t~lephnnP system.
An alternate PmhoflimPnt uses the time division multiple access system.
Another alternate Pmhollimpnt uses the present advanced mobile phone system (AMPS). A typical CDMA r~.' t l~phnnP system is discussed in wo 96/02093 2 1 9 ~ 5 6 8 r~l,o~ C ~ -~7 greater detail in U.S. Patent No. 4,901,307 to (~TilhollqPn et al. and assigned to Qualcomm, Inc.
The ground based radiotelephone system is comprised of a base station (120), also known as a cell site, coupled to a mobile switching 5 center (115) that is coupled to the public switched telephone network (PSTN) (110). The base station (120) communicates with the mobile radiotelephones and switches the signals from the radiotPlephnnP.c to the mobile switching center (116). The base station (120) also provides the proper channels to the radiot~lephnnP, thus enabling communication 10 with the base station. The mobile switching center (115) switches the signals iiom the base station (120) to the PSTN (110) and vice versa.
Each base station (120) is coupled to an antenna (150) that receives and radiates the CDMA radiotelephone signals. In the preferred (.mhoAimPnt, the antenna (150) is identical to typical cell site antennas 15 that are well known to one skilled in the art. An alternate PmhoAimPnt uses an antenna that radiates upward. This upward radiation forms a cell that is elevated above the ground allowing the airborne ra-lin~lPrhnnP
to travel through the elevated cells in the same manner that a mobile radiotalephone on the ground travels through terrestrial cells. An ~) antenna that forms this type of elevated cell is a typical directional antenna that is well known in the art.
A block diagram of the airborne based subsystem of the present invention is illustrated in FIG. 2. This subsystem uses a CD~ type radiotPlephnnP (205) to communicate with a radiot~lPphAne signal 25 repeater (210), having an antenna, that is located in the aircraft. In the preferred Pmho~imPnt~ the repeater (210) also has an amplifier to increase the signal's gain that is being rnmmnnir~ted to the repeater.
The repeater (210) receives the signals from the individual r~AiotnlPrhnrlP~ (205) within the aircraft and relays them to an antenna ~0 (215) mounted on the outside of the aircraft. The outside antenna (215) relays the signals to the base station on the ground. This subsystem may ~ have a single radiotelephone, as in a small aircraft, or multiple r~Aio~ rhnnP~ as in an airline size aircraft.
The airborne subsystem also operates in the reverse direction.
35 Telephone calls from the PSTN to the base station on the ground are tr~m -: ~ to the outside antenna (215) that relays them to the repeater (210) mounted in the aircraft. The repeater's antenna rnmmllni~tP~ the signal to the proper radiotelephone (205) in the aircraft. The rnAiotrl~rhnnP~ (205) APtPrminP which signal is to be decoded by the wo s6/ozog3 2 1 q 4 5 6 8 .
process described in G~lhousen et al. and in the Telecommunications Industries Association/Electronic Industries Association Interim Standard 95 (TIA/EIA/IS-95).
In an alternate PnnhorlimPnt, the radiotelephone signal repeater is 5 replaced by an airborne base station that has the ability to register the radiotf-lPphnnP.c on the aircraft. The airborne base station then registers the radiotelephone with the ground based subsystem. This base station has the same fi1nr~tinnnlity of its ground-based counterpart but on a much smaller scale since it does not have to handle the thousands of 10 radiotelerhnnf-c of the ground-based station.
The airborne commllnir~tinnR system of the present invention operates in a similar way to the ground based CDMA radiotelephone syHtem discussed in G~lhousen et al. A flowchart of this operation is illustrated in FIG. 3.
The process begins by the airborne repeater registering the rnrlifl -' 3, L - with the nearest cell site (301). This is nr~ .f-d in thesame manner as a terrestrial rarliotPlephnnrJ registers with the ground based rnfliotPlPrhnnP system; the repeater searches for the strongest pilot signal and registers with that cell. This registration proce_s involves the 20 radiot~l~rhnnP's tplpphnnp number and ele.,llunic Herial number being trnn~nnitted to the base station. The registration process is described in greater detail in U.S. Patent No. 5,289,527 to liPflPmnnn and assigned to Qll 11 comm Inc.
The r~fliot~lerhnnP or ground-based land-line telephone system can now initiate a call (310). The call from the r~rlint~lpphnrlp is received by the airborne repeater and amplified (320) before being Lr~ d to the ground base station. The ground base station then transmits the call to the mobile switching center that routes the call to the PSTN where it is then rnnnprtel1 to the called telephone number (325).
The signals from the PSTN to the airborne radiotelephone are routed in the reverse of the r~rlintolerhnnp initiated call. The mobile switching center switches the call to the base station to which the rnlliot~l~phnnP is registered. The base station then transmits the signal (325) to the airborne external antenna that relays it to the aircraft repeater (320). The repeater amplifies it and transmits the amplifier signal to the rS~flint''l, L A in the aircraft.
The present invention also enables a ground telephone or r~iot~lPphnnP to contact an airborne rn~int~lPrhnnp Since the repeater has ~ O ' ~ d the airborne r~rli~ h .f with the proper ground base WO96102093 2~94568 ~ 7 station, the mobile switching center knows to which base station the call is to be routed. Once the call is routed to the proper base station it is transmitted to the airborne repeater which then amplifies the call and transrnits it to the r~liotolPrhnnP~ on the aircraft. As discussed above, the 5 radiotPlPph--nPs then ~lPtorminp which signal is to be decoded.
Another benefit of the present invention is the hand-off capability.
Once the aircraft reaches the fringe of the present cell site, the radiotolephnnP begins the hand-off process described in ~iedem~nn. The signals from the ground base stations are received by the external 10 antenna of the airborne subsystem and repeated to the radiotelephones.
This enables the r~ ntolPphnnP~ to search for the strongest pilot signal of the next cell and register with that base station. The determining factor on when the quality of the pilot signal has been reduced to the point that a hand-off is required is when the pilot signal drops a predetermined 15 amount. This amount may be different for every system and is set to optimize the system p~.ru....2~llce.
In the alternate Pmho~imPnt~ the airborne repeater is replaced by a base station-type unit that registers the radiot~lephnnp aboard the aircraft. A block diagram of the airborne base station is illustrated in 30 FIG. 4. Once the rQ-liotelPphnne is registered with the aircraft base station, the aircraft base station then searches for the strongest pilot signal from a ground base shtion and registers with that base station.
Referring to FIG. 4, the airborne base station is comprised of a number of base station transceivers (410) that are the link between the 25 rQ~liot~'nrhnnP and the base station. The CDMA h~L~.~.u~__l subsystem (415) routes the signals betveen the tl~sc~ (410) and the rest of the base station. The call control processor (420) controls signaling with the radiotPlPphnnP~, controls all call processing, and allocates the base station resources. The time and L~t~uu~l(.J unit (430) provides the timing 30 and rl -du,u. .1~.~ signals for the base station. The base station manager (435) performs initiQli7Qtinn~ configuration, and p~ ru~luar~ management of ~ the base station. And finally, the selector bank subsystems (440) processes and formats the data between the ground base stations and the ~ rQ-lintolPphnnP The selector bank subsystems (440) are cnnnPcted to the 35 aircraft's external antenna (315) to receive and radiate the rQ~ olPrhnnP
signals.
Other embo~limPnt~ using the airborne base station may have different ~-....p...~ and different features. A base station that simply wo s6/020s3 2 1 q 4 5 6 8 I ~
registers the radiotelephone and relays this registration to the ground base station is also within the scope of the present invention.
Claims (5)
1. An airborne communications system having a ground based subsystem and an airborne based subsystem, the communications system comprising:
an airborne radio, in the airborne based subsystem, for transmitting and receiving radio signals;
an airborne radio repeater for relaying radio signals from the airborne radio to the ground based subsystem and for relaying radio signals from the ground based subsystem to the airborne radio; and a ground based subsystem base station, coupled to a public switched telephone network (PSTN) for transmitting PSTN originated signals and receiving relayed radio signals, the base station having at least one upward radiating antenna for transmitting and receiving the radio signals.
an airborne radio, in the airborne based subsystem, for transmitting and receiving radio signals;
an airborne radio repeater for relaying radio signals from the airborne radio to the ground based subsystem and for relaying radio signals from the ground based subsystem to the airborne radio; and a ground based subsystem base station, coupled to a public switched telephone network (PSTN) for transmitting PSTN originated signals and receiving relayed radio signals, the base station having at least one upward radiating antenna for transmitting and receiving the radio signals.
2. The communications system of claim 1 wherein the repeater has the capability of registering the airborne radio with the base station.
3. An airborne communications system having a ground based code division multiple access (CDMA) radiotelephone subsystem and an airborne based subsystem, the communications system comprising:
an airborne radiotelephone, in the airborne based subsystem, for transmitting and receiving CDMA signals;
an airborne base station for registering the radiotelephone with the ground based CDMA radiotelephone subsystem and relaying CDMA radio signals from the airborne radiotelephone to the ground based subsystem and for relaying CDMA radio signals from the ground based subsystem to the airborne radio; and a CDMA base station in the ground based CDMA subsystem, coupled to a public switched telephone network (PSTN), for transmitting PSTN originated signals and receiving relayed CDMA radio signals, the base station having a plurality of upward radiating antennas for transmitting and receiving the radio signals.
an airborne radiotelephone, in the airborne based subsystem, for transmitting and receiving CDMA signals;
an airborne base station for registering the radiotelephone with the ground based CDMA radiotelephone subsystem and relaying CDMA radio signals from the airborne radiotelephone to the ground based subsystem and for relaying CDMA radio signals from the ground based subsystem to the airborne radio; and a CDMA base station in the ground based CDMA subsystem, coupled to a public switched telephone network (PSTN), for transmitting PSTN originated signals and receiving relayed CDMA radio signals, the base station having a plurality of upward radiating antennas for transmitting and receiving the radio signals.
4. The airborne communications system of claim 3 wherein the plurality of upward radiating antennas substantially precluding radiation of the CDMA radio signals at ground level.
5. An airborne radiotelephone system, comprising:
an airborne radiotelephone having a capability for transmitting and receiving code division multiple access (CDMA) radiotelephone signals;
a plurality of base stations, coupled to a public switched telephone network (PSTN), for coupling received CDMA radiotelephone signals to the PSTN and for converting PSTN signals to CDMA radiotelephone signals for transmission to the airborne radiotelephone; and a plurality of upward radiating antennas, each antenna coupled to a first base station of the plurality of base stations, for receiving and radiating the CDMA radiotelephone signals, the plurality of upward radiating antennas substantially precluding radiation of the CDMA
radiotelephone signals at ground level.
an airborne radiotelephone having a capability for transmitting and receiving code division multiple access (CDMA) radiotelephone signals;
a plurality of base stations, coupled to a public switched telephone network (PSTN), for coupling received CDMA radiotelephone signals to the PSTN and for converting PSTN signals to CDMA radiotelephone signals for transmission to the airborne radiotelephone; and a plurality of upward radiating antennas, each antenna coupled to a first base station of the plurality of base stations, for receiving and radiating the CDMA radiotelephone signals, the plurality of upward radiating antennas substantially precluding radiation of the CDMA
radiotelephone signals at ground level.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/272,061 | 1994-07-08 | ||
| US08/272,061 US5519761A (en) | 1994-07-08 | 1994-07-08 | Airborne radiotelephone communications system |
| PCT/US1995/008607 WO1996002093A1 (en) | 1994-07-08 | 1995-07-07 | Airborne radiotelephone communications system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2194568A1 true CA2194568A1 (en) | 1996-01-25 |
Family
ID=23038238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002194568A Abandoned CA2194568A1 (en) | 1994-07-08 | 1995-07-07 | Airborne radiotelephone communications system |
Country Status (15)
| Country | Link |
|---|---|
| US (1) | US5519761A (en) |
| EP (1) | EP0770287B1 (en) |
| JP (1) | JP3547754B2 (en) |
| KR (1) | KR100375194B1 (en) |
| CN (3) | CN1141805C (en) |
| AT (1) | ATE304243T1 (en) |
| AU (1) | AU688543B2 (en) |
| BR (1) | BR9508257A (en) |
| CA (1) | CA2194568A1 (en) |
| DE (1) | DE69534428T2 (en) |
| FI (1) | FI970084A (en) |
| HK (2) | HK1012796A1 (en) |
| MX (1) | MX9700242A (en) |
| RU (1) | RU2146851C1 (en) |
| WO (1) | WO1996002093A1 (en) |
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- 1995-07-07 RU RU97101896A patent/RU2146851C1/en not_active IP Right Cessation
- 1995-07-07 EP EP95926223A patent/EP0770287B1/en not_active Expired - Lifetime
- 1995-07-07 JP JP50444296A patent/JP3547754B2/en not_active Expired - Lifetime
- 1995-07-07 CN CNB011355808A patent/CN100471089C/en not_active Expired - Lifetime
- 1995-07-07 WO PCT/US1995/008607 patent/WO1996002093A1/en active IP Right Grant
- 1995-07-07 CA CA002194568A patent/CA2194568A1/en not_active Abandoned
- 1995-07-07 DE DE69534428T patent/DE69534428T2/en not_active Expired - Lifetime
- 1995-07-07 KR KR1019970700064A patent/KR100375194B1/en not_active IP Right Cessation
- 1995-07-07 AU AU30056/95A patent/AU688543B2/en not_active Ceased
- 1995-07-07 CN CN95193991A patent/CN1082284C/en not_active Expired - Lifetime
- 1995-07-07 MX MX9700242A patent/MX9700242A/en unknown
- 1995-07-07 AT AT95926223T patent/ATE304243T1/en not_active IP Right Cessation
- 1995-07-07 BR BR9508257A patent/BR9508257A/en not_active IP Right Cessation
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1997
- 1997-01-08 FI FI970084A patent/FI970084A/en not_active Application Discontinuation
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1998
- 1998-12-16 HK HK98113755A patent/HK1012796A1/en not_active IP Right Cessation
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2002
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Also Published As
| Publication number | Publication date |
|---|---|
| CN1141805C (en) | 2004-03-10 |
| DE69534428D1 (en) | 2005-10-13 |
| MX9700242A (en) | 1998-01-31 |
| DE69534428T2 (en) | 2006-06-22 |
| KR970705250A (en) | 1997-09-06 |
| FI970084A0 (en) | 1997-01-08 |
| HK1043448A1 (en) | 2002-09-13 |
| HK1043448B (en) | 2004-12-31 |
| CN100471089C (en) | 2009-03-18 |
| AU688543B2 (en) | 1998-03-12 |
| BR9508257A (en) | 1997-12-23 |
| CN1380756A (en) | 2002-11-20 |
| JP3547754B2 (en) | 2004-07-28 |
| JPH10502777A (en) | 1998-03-10 |
| KR100375194B1 (en) | 2003-05-22 |
| EP0770287B1 (en) | 2005-09-07 |
| CN1152379A (en) | 1997-06-18 |
| HK1012796A1 (en) | 1999-08-06 |
| US5519761A (en) | 1996-05-21 |
| RU2146851C1 (en) | 2000-03-20 |
| AU3005695A (en) | 1996-02-09 |
| CN1330461A (en) | 2002-01-09 |
| ATE304243T1 (en) | 2005-09-15 |
| CN1082284C (en) | 2002-04-03 |
| EP0770287A1 (en) | 1997-05-02 |
| WO1996002093A1 (en) | 1996-01-25 |
| FI970084A (en) | 1997-01-08 |
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| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued | ||
| FZDE | Discontinued |
Effective date: 20051128 |