CN1522506A - Candidate handoff list for airborne cellular system - Google Patents
Candidate handoff list for airborne cellular system Download PDFInfo
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- CN1522506A CN1522506A CNA018234224A CN01823422A CN1522506A CN 1522506 A CN1522506 A CN 1522506A CN A018234224 A CNA018234224 A CN A018234224A CN 01823422 A CN01823422 A CN 01823422A CN 1522506 A CN1522506 A CN 1522506A
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- aircraft
- terrestrial cells
- candidate
- handover
- wave beam
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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
- H04B7/18502—Airborne stations
- H04B7/18504—Aircraft used as relay or high altitude atmospheric platform
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/04—Reselecting a cell layer in multi-layered cells
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
- H04W64/006—Locating users or terminals or network equipment for network management purposes, e.g. mobility management with additional information processing, e.g. for direction or speed determination
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- 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
A terrestrial cell site handoff list is dynamically maintained for an airborne cellular system (10). A beam pattern is maintained relative to an airborne cellular system repeater, but rotates relative to the geographic area of coverage. A location and heading of the airplane (35), locations of respective beams transmitted from the airplane based on airplane flight pattern data, and locations of respective cell sites within a vicinity of footprints of the respective beams transmitted from the airplane are determined. A list of viable handoff terrestrial cell site candidates is then calculated based on the beam pattern, the location and heading of the airplane, the locations of respective beams transmitted from the airplane based on airplane flight pattern data, and the locations of respective cell sites.
Description
Technical field
Relate generally to of the present invention comprises the wireless communication system of airborne repeater, relates in particular to the Dynamic Maintenance of terrestrial cells station handover (handoff) tabulation of airborne cellular system.
Background technology
The wireless network of positions different on outlying and geography and the needs that increase day by day of communication capacity are produced bigger requirement to wireless system.Many new communication common carriers of the foundation structure of this system that provide focus on construction terrestrial cells as much as possible station with their resource.As a result, their areas of coverage separately of communication common carrier expansion, and therefore create more income.
But, ground base station to increase the speed of building slow in the extreme and expensive, especially almost do not have highway and few outside the mountain area and the underpopulatio area of attached infrastructure.In addition, some above-mentioned underpopulatio areas, the investment return of communication common carrier can not provide communication common carrier to build the necessary required excitation of cell site, thereby allows the only limited service in these areas or do not have wireless service at all.In addition, many radio communication base stations with sufficient amount can not be handled temporary transient a large amount of calling during attract a large amount of common people only several days motion event or other special events fully with the area of the calling of handling non-peak and rush hour.
Requirement above answering, the airborne wireless system is suggested, wherein wireless repeater is installed aboard, aircraft is needing flight predetermined flight pattern (pattern) on the geographic area of wireless coverage, and wireless repeater will be received ground base station and other infrastructure parts from the wireless telephonic call chain in the covered field reason zone.Because aircraft can pass through geographical limitation and replace cell site, this system overcomes the problems referred to above.
Although airborne cellular system has many advantages, its have the design of conventional ground-based cellular systems and realize in the design that do not have and realize key element.A staple relates to the maintenance that cell site is called out the hand-off canaidates tabulation.Conventional cellular standards and agreement for example TIA/EIA 136, GSM and CDMA IS-95 are stipulated this hand-off canaidates.In ground-based cellular systems, the mobile phone that is used for power monitoring is controlled and passed to hand-off canaidates in system switching.Then, switch is made the handover decision based on the power measurement report from mobile phone.The quantity of the hand-off canaidates that agreement is supported is limited and time to time change not typically.For example, in honeycomb TIA/EIA 136 agreements, the restricted number of candidate is 24.
In airborne cellular system, because aircraft its flight pattern in around, move relative to ground from the communication beams (beam) of aircraft antenna emission, call out handover thereby when wave beam is rotated into and rotates the predetermined system area of coverage, cause system to carry out.When airborne cellular system covered typically wide geographic area, each system's wave beam may be influential to a lot of terrestrial cells station.Therefore arbitrary probably particular beam will surpass the quantity of arranging the hand-off canaidates that cellular protocol supports to the sum at its influential terrestrial cells station.
In addition, airborne cellular system is that cost provides geographical covering with big calling carrying capacity.Therefore, if airborne cellular system launches in having the main low-density area of high density pocket, the service provider wishes that building the ground system cell site in the high density pocket also provides service with airborne cellular system to remaining density regions.But, may overlap with the wave beam of ground system cell site from the communication beams of airborne cellular system.Because compare with the communication beams of airborne cellular system, the ground system cell site typically has more high power, and system user tends to shift to the ground system cell site in the crossover region.
User in the zone that is not covered by the terrestrial cells station communicates by letter by airborne cellular system at first and may switch to ground system, will reduce carrying capacity on the airborne cellular system for the ground system cell site from the customer call handover of airborne cellular system because may wish.Because, several ten thousand ground system cell sites are often arranged, airborne cellular system must produce corresponding hand-off canaidates tabulation, and it comprises hundreds of cell site hand-off canaidates.Unfortunately, this hand-off canaidates tabulation is current surmounts the ability of standard cellular agreement and the needs that solve foregoing problems is arranged far and away.
Description of drawings
Advantage of the present invention will understand easily from following its detailed description of the preferred embodiments of considering with appended drawings, wherein:
Fig. 1 is the system diagram according to airborne cellular communication of the present invention;
Fig. 2 is the block diagram that illustrates in greater detail the part of the airborne cellular communication system shown in Fig. 1;
Fig. 3 is the plane graph from the beam pattern of airborne repeater, airborne repeater downwards predetermined geographic area and provide honeycomb to cover as the terrestrial cells station of hand-off canaidates;
Fig. 4 is for example a branch of plane graph in Fig. 3 beam pattern of simple beam, and it shows in beam pattern the terrestrial cells station as hand-off canaidates; And
Fig. 5 is the flow chart according to the hand-off canaidates tabulating method of the preferred embodiment of the invention.
Embodiment
Referring now to accompanying drawing,, wherein similar numeral relates to similar part.Fig. 1 shows airborne cellular communication system 10.System 10 usually comprises three main pieces: cellular infrastructure piece 12, infrastructure radio block structure 14 and aircraft piece 16.These three pieces can provide cellular communication to cover to big geographic area by making the system user of being represented by mobile phone 18 usually be linked to public switched telephone network (PSTN) 20 via the aircraft payload 22 that comprises repeater synergistically.
More particularly, BTS 30 sends and receives the RF signal by ground Changer Device 32.Ground Changer Device 32 converts the terrestrial cellular format signal to the C-band format signal and communicates by letter with airborne payload 22 with telemetry link 34 by feeding link 33, and each of feeding link 33 and telemetry link 34 will go through subsequently.Payload 22 is set up and be used for connecting the radio link of calling out 36 on wide geographical, and when aircraft can surpass 350km when 30,000 feet or near maintenance flight pattern on the ground, radio link 36 can be above 350 kilometers.
Except aircraft 35, aircraft piece (segment) 16 also comprises Aircraft Operations Facility 37, its to small part based on from information source for example the information of weather centre 38 control the aerial mission logistics and manage all system's aircrafts because optimum system choosing ground comprises that three airplanes are to guarantee continuous covering.Aircraft also receives from for example other routine indication at air traffic control center 40 of information source.
Fig. 2 shows some part of system 10 in greater detail.Particularly, ground Changer Device 32 comprises: C-band antenna 42 is used to receive from the signal of payload 22 and transmits a signal to payload 22 (for redundancy purpose also provides second antenna); C-band transducer 44 is used for suitably changing from payload 22 signals that receive or that be sent to payload 22.According to preferred embodiment, C-band antenna 42 can communicate by letter the airborne cellular antenna 70 of 800MHz via down link of having set up or feeding link 33 with transducer 44 with BTS 30a, 30b, and transducer 44 will upwards convert the C-band signal to from the nominal signal of BTS 30a, 30b before signal is sent to aircraft 35.And, each BTS 30a, 30b are dispensed on the different-waveband in the C band spectrum, feasible signal from different B TS 30a, 30b can separate and send to for example antenna 56 at payload 22 places of correct antenna, in addition, GCU 32 comprises remote measurement part for example telemetering antenna 46, remote measurement modulator-demodulator 48 and remote measurement processor 50, receiving and to handle the airplane data that sends from aircraft telemetering antenna 52 on telemetry link 34, and control terminal 54 controls have been handled telemetry and have been sent to OMC 26 and Aircraft Operations Facility 37.
In aircraft piece 16, above-mentioned aircraft telemetering antenna 52 sends the aircraft aviation electronics data that produced by the Airplane Avionics of generally representing at 58 places, comprises aircraft position, direction and flight pattern data and for example pitching of other data, the data of sidewindering and go off course.Be input to payload processor 60 and before outputing to telemetering antenna 52, handle from the data of Airplane Avionics 58 by payload processor 60 by remote measurement modulator-demodulator 62.Payload processor 60 also is responsible for handling the signal that sends to ground Changer Device 32 and receive from ground Changer Device 32 by the feeding link 33 that is based upon between the C- band antenna 42,56, and be responsible for to handle by being based upon for example down link between the 800MHz antenna 70 or user link 69 signal that sends to system user 18 and receive from system user 18 of user 18 and payload downlink antenna, wherein payload signal that receive and that send from payload is by suitably upwards conversion or conversion downwards of 800MHz transducer 72.Payload 22 also comprises GPS equipment 74 except comprising the said equipment, and it also can be input to processor 60 and send to ground Changer Device 32 or send to Aircraft Operations Facility 37 and be used for flight control and/or monitoring purposes.In the aircraft and the part shown in the pay(useful) load form the aircraft repeater jointly, it covers honeycomb and can offer big geographic area, otherwise because cell site of not enough quantity etc. and can not support terrestrial cellular to cover.
Will be appreciated that from the system configuration shown in Fig. 1 and 2: seem identical with system user 18 airborne cellular systems 10 with conventional ground-based cellular systems for PSTN 20.In other words, in the calling that is linked to PSTN 20 by cellular infrastructure piece, infrastructure radio block structure and aircraft piece 12-16 and between by the calling that plane system foundation structure is handled routinely, there is not the recognizable service difference of being correlated with, partly because the following fact: cellular infrastructure piece 12 is included in standard telephone electric wire connecting junction and BTS 30a, the 30b among the MSO24, they be included in plane system foundation structure routinely in those are identical or much at one.
Referring again to Fig. 1 and 2, will be described in the operation of the part of airborne cellular system 10 in the process of finishing the calling that a system user 18 sent now.Aircraft 35 when awaiting orders in the air preferably with circular or near circular flight pattern flight (though the flight pattern may be according to concrete weather and coverage condition and conversion), in the aerial mission process, to provide covering to predetermined geographic area.When aircraft was awaited orders in the air, it kept getting in touch with ground Changer Device 32, to provide by feeding link 33 and the user link 36 of infrastructure radio structural device piece 14 to cellular infrastructure piece 12.Aircraft 35 also sends the communication beams that pre-determines quantity and for example 13 restraints on the area of coverage, and every bundle is assigned with the sector of BTS 30a, 30b and has its one group of control and communication port, to transmit signal and speech data between system user 18 and cellular infrastructure piece 12.When aircraft 35 is mobile in its flight pattern, from the wave beam rotation of aircraft emission.Therefore, system user 18 approximately will " be seen " different beams in per 45 seconds, and the sector of cellular infrastructure piece 12 execution callings is to the handover of sector, a little less than preventing that calling from changeing.
When beginning to call out, system user is of user 18 for example, uses the control channel in the wave beam to notify MSO 24 request calls to set up.Request sends to aircraft payload 22 from user 18 mobile phone, and is forwarded to ground Changer Device 32 then.Ground Changer Device 32 is forwarded to for example BTS 30a of corresponding BTS with request.Then, BTS 30a sends to MSO 24 with request, and it sets up the calling of PSTN 20.Therefore, payload 22 only extends to user 18 with the physical layer of BTS30, to compare with the area of coverage that is typically provided by plane system routinely, allows the much wide ground area of coverage, and has still less relevant rudimentary structure and increase and build up this.Mobile system 10 is preferably also the special event zone provides temporary transient honeycomb to cover, and wherein covering only needs several days, thereby eliminates and set up cell site and dismantle relevant needs of cell site and cost then after the special event end.
In case call setup is finished, the voice communication by communication channel in the wave beam and PSTN 20 begins, and voice messaging is transmitted in the mode identical with signaling information then.When end of calling, a signal sends to MSO 24 to pull apart calling, and user 18 mobile phone discharges the communication channel that is used for voice communication, and this channel is got back to idle condition.
Fig. 3 shows the exemplary area of coverage 80 by aircraft piece 16 generations of airborne cellular system 10.The area of coverage is formed by the wave beam 82-94 from antenna 70 emissions, the name that antenna 70 is preferably submitted on June 26th, 2000 is called the sensitive antenna of phased array of disclosed type in " the sensitive antenna of airborne cellular system " PCT patent application PCT/US00/17555 number, is incorporated herein its content as a reference.Except that central beam, each wave beam rotation when aircraft 35 is carried out its flight pattern.Therefore, for example cell site A1-A4 and B1-B2 correspondingly are rotated into and rotate the area of coverage of the wave beam track of each wave beam at the terrestrial cells station.In Fig. 3, the flight pattern of aircraft is shown as with counter rotation, as by shown in the flight pattern direction arrow FP.When aircraft was carried out its flight pattern, wave beam 82-94 correspondingly rotated with the direction identical with respect to geographical, but keeps motionless with respect to aircraft 35.
Therefore, each wave beam zone that for example wave beam 93 scanning is big and may overlapping with many ground stations.Static hand-off canaidates tabulation requires not only to have current those ground stations under wave beam for example stand A1 and A3 and will very fast those stations under wave beam for example stand A2 and A4, and has the B1 of station and B2.Therefore, typically the system hand-off canaidates of 24 candidates limit may by considerably beyond.
In order to reduce the quantity of candidate, according to the initial handoff list that produces as the function of beam. position of wave beam hand-off canaidates maintenance technology of the present invention.Therefore, wave beam 93 will only comprise that station A1-A4 can not comprise station B1-B2 as hand-off canaidates, and wave beam 87 will comprise that B1 and B2 do not comprise A1-A4 as candidate.When aircraft is carried out its flight pattern, the candidate list of each wave beam will change, and make that candidate B1-B2 will replace candidate A1-A4 when wave beam 93 covers the B1-B2 of ground station.
Wave beam hand-off canaidates maintenance technology of the present invention is based on the periodically hand-off canaidates tabulation of definite each wave beam of the handoff list database that dynamically updates that is kept among the OMC 26.Data comprise the terrestrial cells station location of storage, and the terrestrial cells station location is used for calculation plot station candidate handoff list together with the aircraft position that is input to OMC 26 by aircraft telemetry link 34 and vector data.OMC 26 can produce the hand-off canaidates tabulation that only comprises the maximum probability/priority candidate that pre-determines quantity and can upgrade/revise tabulation as the function of time.For example, in the airborne cellular system that uses TIA/EIA 136 agreements, 24 hand-off canaidates only the highest based on the handover preference will be included in the handoff list of each wave beam.
For example, referring again to Fig. 3, the user who is served by wave beam 93 has wave beam 92,94 as the time-sensitive hand-off canaidates with minimum.When aircraft 35 is carried out its flight pattern, payload 22 will be monitored the wave beam 92,94 as hand-off canaidates continuously.Payload also will have the A1-A4 of ground station as insensitive candidate of time.Insensitive candidate of these times is periodically calculated the handover facility that makes between aircraft 35 and the ground system with the capacity limit on the mitigation system 10.These hand-off canaidates are that the time is insensitive, can not influence call features because the delay in the handover between aircraft 35 and the ground system will only influence the latent capacity of wave beam 93.As a result, hand-off canaidates tabulation at any given time will comprise the several time-sensitive hand-off canaidates that occupy the time slot (slot) in the hand-off canaidates tabulation continuously and only periodically occupy the interior insensitive hand-off canaidates of time slots of hand-off canaidates tabulation.
Referring now to Fig. 4,, will discuss now how the priorization hand-off canaidates is included in the hand-off canaidates tabulation of the periodicity generation relevant with communication beams continually with definite candidate according to the present invention.Because possible insensitive hand-off canaidates of a large amount of time and a spot of hand-off canaidates tabulation time slot, this priorization is necessary, and based on the probability as the given terrestrial cells of the best handover sub-district of user.In preferred embodiments, priorization is based on the user density relevant with the sub-district.The high density sub-district will receive most of handovers probably, therefore compare with the low-density sub-district and be arranged as higher preference candidate.Therefore compare with the low priority candidate, the high priority candidate is with the insensitive hand-off canaidates tabulation of the entry time that circulate more continually time slot.
As shown in Figure 4, the user for example the position C1 in the sub-district 96 that forms by wave beam 95 will have the sub-district that forms by wave beam 98 97 as occupying the responsive hand-off canaidates of hand-off canaidates tabulation time slots continuously.Being positioned at suburb that the urban district covers and the terrestrial cells C2-C5 with high user density also will be the high priority candidate.Therefore, C1-C5 will circulation continually in handoff list.The covering of Podunk is provided and has the sub-district C6 of low user density and be positioned at the middle sub-district C7 of defined Urban Area Coverage to be defined as low preference candidate, therefore will be without the hand-off canaidates tabulation cocycle of being everlasting.More particularly, sub-district C7 will be considered to low preference candidate, because if the user is during near sub-district C7, customer call will directly be linked to corresponding ground system by sub-district C7 rather than by system 10.
Therefore, preferably be kept at hand-off canaidates list database among the OMC 26 by according to above-mentioned preferred embodiment of the present invention, dynamically update based on the difference between the insensitive hand-off canaidates of aircraft position, time-sensitive and time and according to the priorization of the insensitive hand-off canaidates of time of user density.Optional embodiment can be based on coming insensitive candidate of priorization time according to the factor different with user density of system's special parameter.And, the relative order of all hand-off canaidates can be based on the relative density relevant with each hand-off canaidates sub-district with based on treating in the system 10 that the user who is handed over to another wave beam from a wave beam need set up relatively, the high and low priority hand-off canaidates with further priorization.
If the candidate of excessive number is arranged after the high priority list producing, technology of the present invention can circulate by those handover cell candidates intercycle ground of non-time-sensitive in footprint of a beam and further reduce the quantity of candidates.In other words, the land-based cell site of non-time-sensitive can be divided into many groups in wave beam, so that the technology that has more senior solution according to of the present invention to be provided.Then, the handoff list maintenance technology can be only circulation more regularly in these groups of non-time-sensitive sub-district, so that the more accurate renewal of handoff list to be provided, and can the responsive sub-district of influence time the handover of the sub-district C1 among Fig. 3 for example.Though for example about 15 seconds relevant handoff delay will be followed the circulation in a plurality of groups of non-time-sensitive sub-district, this delay is receivable.
Fig. 5 be usually 100 the explanation candidate handoff list maintenance technology of the present invention methodological flow chart.Begin this method and determine aircraft position and course via the gps data that provides by telemetry link 34 from aircraft 35 102, and in 104 beam. position of determining each communication beams.In 106 hand-off canaidates probability calculations as discussed above and the part carry out based on the terrestrial cells station location data in the cellular system handover reconciling database that is stored in 108 places.After the calculating on carry out, be sorted and the high priority candidate is determined at 110 hand-off canaidates.At 112 candidates of determining in certain wave beam, whether to have excessive number.If the candidate of excessive number is arranged really, the definite of above-mentioned non-time-sensitive candidate can carry out 114, and insensitive candidate of time is subsequently in 116 periodically circulations.Then, be updated after insensitive hand-off canaidates circulation of time in the tabulation of 118 hand-off canaidates, to produce the hand-off canaidates tabulation 120.
If at 112 candidates of determining not have excessive number, the hand-off canaidates tabulation is upgraded 119, producing the hand-off canaidates tabulation 120, and not be used in that 114 and 116 places determine and circulation timei insensitive candidate.And, as represented by dotted line 122, sorting operation 110 and determine and can skip at 112 too much candidate, and this technology can directly proceed in the periodic cycle of 116 execution in insensitive candidate of time from carrying out the hand-off canaidates probability calculations 106.
Except making handover facility from airborne cellular system to the ground system cell site, consider that also candidate handoff list maintenance technology of the present invention can be designed to above-mentioned opposite mode and promote handover, perhaps in other words, the handover of permission from ground system to contiguous airborne communication system.In this case, terrestrial cells contiguous with the mobile system area of coverage or that overlap also requires time dependent hand-off canaidates tabulation.This tabulation will be worked in the mode that is similar to above-mentioned tabulation, except communication beams rather than terrestrial cells will be hand-off canaidates.But because one or two wave beam is only arranged on terrestrial cells at one time usually, round-robin method will be not necessarily.
Will be appreciated that candidate wave beam handoff list maintenance technology of the present invention now from above-mentioned discussion, by allowing between broad regions covering airborne cellular system that covers application and ground system, to carry out the interoperability that reliable handover promotes ground system and airborne cellular system.The present invention also promotes the reliable handover between the adjacent airborne cellular system, and can based on factor for example the terrestrial cells user density distinguish the hand-off canaidates of time-sensitive and non-time-sensitive.
Though foregoing description, will be appreciated that the scope and the reasonable implication that can not deviate from following claim about the preferred embodiments of the invention and changes, changes and change the present invention.
Claims (19)
1. method of safeguarding the terrestrial cells station handoff list of airborne cellular system comprises:
Safeguard from the beam pattern of the communication beams of aircraft transmission with respect to cellular system users;
Determine the position and the course of aircraft;
Determine from the position of each wave beam of aircraft transmission based on aircraft flight pattern data;
Determine near the position of each cell site the area of coverage of each wave beam that sends from aircraft; And
Based on the determining of maintenance, aircraft position and the course of beam pattern, according to the position of each wave beam that sends from aircraft of aircraft flight pattern data determine and each cell-site location determine the tabulation of calculating feasible handover terrestrial cells station candidate.
2. what the process of claim 1 wherein aircraft position and course determines to comprise the flight pattern position of determining aircraft via telemetry link.
3. the method for claim 1, the calculating of wherein feasible handover terrestrial cells station candidate list comprise with from the position of safeguarding beam pattern, determine the position of aircraft and course, determining each wave beam that sends from aircraft based on aircraft flight pattern data and the data map that produces of the position of determining each cell site to the cell-site location database, to determine feasible handover terrestrial cells station candidate.
4. the method for claim 1 also comprises based on the dependent probability data of setting up in the process of calculating feasible handover terrestrial cells station candidate list each feasible handover terrestrial cells station candidate that sorts.
5. the method for claim 4, the quantity of wherein calculating the feasible handover terrestrial cells station candidate of setting up in the candidate list process of feasible handover terrestrial cells station is protocol-dependent.
6. the process of claim 1 wherein that the calculating of feasible handover terrestrial cells station candidate list carries out for each of each wave beam that sends from aircraft.
7. the method for claim 6 also comprises according to the candidate geographical position in each wave beam of each wave beam that sends from aircraft feasible handover terrestrial cells station candidate list is divided into a plurality of candidate group; And
Circulation is further to simplify feasible handover ground candidate list based on these a plurality of candidate group in a plurality of candidate group.
8. the method for claim 7, wherein relevant handoff delay is introduced in the circulation in a plurality of candidate group.
9. the method for claim 1 also comprises when aircraft flight pattern data change, and upgrades the feasible handover terrestrial cells station candidate list as the function of time.
10. the process of claim 1 wherein that the calculating of feasible handover terrestrial cells station candidate list is performed, change by the aircraft flight pattern that the adverse weather condition causes with compensation.
11. the method for claim 1 also comprises and calculates the feasible airplane wave beam be used to accept from the handover at terrestrial cells station; And
Create aircraft wave beam handoff list based on the calculating of feasible airplane wave beam.
12. the method for claim 1 also comprises feasible handover terrestrial cells station candidate list is divided into time-sensitive candidate and non-time-sensitive hand-off canaidates.
13. in having the cellular communication system of airborne repeater, be used to calculate the device of terrestrial cells station hand-off canaidates tabulation, comprise:
Receiver, the aircraft beam pattern information and the terrestrial cells station location information that are used to receive aircraft flight pattern information, cover about the geography of the communication beams that sends from aircraft;
Database is used to store the handover harmony messages; And
Processor is used for based on the information calculations hand-off canaidates tabulation from receiver and database, can be handed over to the terrestrial cells station with the communication beams that the mode of optimizing the call communication route to be sent from aircraft so that call out.
14. the device of claim 13, the pattern packets of information of wherein flying is drawn together aircraft position, course and footprint of a beam information.
15. the device of claim 13, wherein receiver, database and processor are realized in land-based radio communication base station.
16. the device of claim 13, wherein receiver, database and processor are realized in aircraft, and communicate by letter with land-based control station via telemetry link.
17. the device of claim 13, wherein the hand-off canaidates tabulation comprises the cell site in the single communication beams.
18. the device of claim 13, wherein processor is used for each communication beams is divided into many groups cell site in each communication beams, and in many group cell sites circulation with further simplification hand-off canaidates tabulation.
19. the device of claim 13, wherein processor also is used to calculate the handoff list of terrestrial cells station to the candidate communication beams.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/US2001/020822 WO2003003614A1 (en) | 2001-06-29 | 2001-06-29 | Candidate handoff list for airborne cellular system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1522506A true CN1522506A (en) | 2004-08-18 |
| CN1285176C CN1285176C (en) | 2006-11-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB018234224A Expired - Fee Related CN1285176C (en) | 2001-06-29 | 2001-06-29 | Candidate handoff list for airborne cellular system |
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| Country | Link |
|---|---|
| EP (1) | EP1405441A1 (en) |
| JP (1) | JP2005500722A (en) |
| KR (1) | KR20040008233A (en) |
| CN (1) | CN1285176C (en) |
| WO (1) | WO2003003614A1 (en) |
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| CN109690972A (en) * | 2016-07-05 | 2019-04-26 | Gogo有限责任公司 | Serving cell selection in air-to-ground communication system |
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| JP4718592B2 (en) * | 2008-09-17 | 2011-07-06 | 株式会社エヌ・ティ・ティ・ドコモ | Radio network control apparatus and handover control method |
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| US8868069B2 (en) * | 2012-05-29 | 2014-10-21 | Sierra Wireless, Inc. | Airliner-mounted cellular base station |
| US10638397B2 (en) | 2016-12-22 | 2020-04-28 | Microsoft Technology Licensing, Llc | Handover in 5G microcellular |
| CN114858327B (en) * | 2022-03-15 | 2023-02-17 | 同济大学 | Airplane wheel track identification method based on soil pressure gauge |
| WO2023219381A1 (en) * | 2022-05-09 | 2023-11-16 | 삼성전자 주식회사 | Method and device for supporting aerial ue communication through cellular network |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5574968A (en) * | 1994-06-01 | 1996-11-12 | Motorola, Inc. | Satellite cellular communication methods for performing cell-to-cell handoff |
| US5559865A (en) * | 1994-07-08 | 1996-09-24 | Qualcomm Incorporated | Airborne radiotelephone communications system |
| US5678184A (en) * | 1995-04-28 | 1997-10-14 | Motorola, Inc. | Method of pre-computation of candidate handoff cell list for cellular communications |
| EP1224751B1 (en) * | 1999-09-13 | 2006-05-17 | Motorola, Inc. | Multi-airplane cellular communications system |
-
2001
- 2001-06-29 KR KR10-2003-7017179A patent/KR20040008233A/en not_active Application Discontinuation
- 2001-06-29 WO PCT/US2001/020822 patent/WO2003003614A1/en not_active Application Discontinuation
- 2001-06-29 CN CNB018234224A patent/CN1285176C/en not_active Expired - Fee Related
- 2001-06-29 EP EP01957083A patent/EP1405441A1/en not_active Withdrawn
- 2001-06-29 JP JP2003509670A patent/JP2005500722A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104919651A (en) * | 2013-01-13 | 2015-09-16 | 高通股份有限公司 | Method for air-to-ground data link antenna self calibration |
| US10470095B2 (en) | 2013-01-13 | 2019-11-05 | Qualcomm Incorporated | Method for air-to-ground data link antenna self calibration |
| CN107925460A (en) * | 2015-09-02 | 2018-04-17 | 瑞典爱立信有限公司 | Radio network node and for enabling mobility method between the nodes |
| CN107925460B (en) * | 2015-09-02 | 2021-08-20 | 瑞典爱立信有限公司 | Method for enabling mobility between radio network nodes |
| CN109690972A (en) * | 2016-07-05 | 2019-04-26 | Gogo有限责任公司 | Serving cell selection in air-to-ground communication system |
| CN109690972B (en) * | 2016-07-05 | 2021-11-09 | 高高商务航空有限责任公司 | Serving cell selection in air-to-ground communication systems |
| CN110476455A (en) * | 2017-04-28 | 2019-11-19 | Kddi株式会社 | Wireless communication device, communication control method and computer program |
| CN110476455B (en) * | 2017-04-28 | 2021-10-26 | Kddi株式会社 | Wireless communication device, communication control method, and computer program |
| US11272418B2 (en) | 2017-04-28 | 2022-03-08 | Kddi Corporation | Wireless communication device, communication control method, and computer program |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1405441A1 (en) | 2004-04-07 |
| KR20040008233A (en) | 2004-01-28 |
| WO2003003614A1 (en) | 2003-01-09 |
| JP2005500722A (en) | 2005-01-06 |
| CN1285176C (en) | 2006-11-15 |
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