CN102143557A - Airborne-bus-based civil aeroplane mobile communication cabin access system and method - Google Patents

Abstract

The invention discloses an airborne-bus-based civil aeroplane mobile communication cabin access system. The access system comprises an airborne bus, an exchanger, a router and a plurality of pieces of access point equipment. The exchanger is connected with the airborne bus and the router is connected with the exchanger for exchanging data between the airborne bus and a ground data link or a sky data link. The access point equipment is connected with the airborne bus for accessing a mobile terminal in a cabin. The access point equipment comprises a radiofrequency module with a multi-radiofrequency structure and the radiofrequency module can receive multiple types of mobile user data (2G, 3G and 4G), Bluetooth, infrared, worldwide interoperability for microwave access (WiMAX), wireless fidelity (WiFi) and so on. The invention also discloses an access method based on the system. In the method, a multi-access point diversity technique is adopted for access. The invention is simple in structure, expandable and compatible with multiple types of communication networks; and multiple access points and the mobile terminal form multi-path diversity reception, so that communication quality is effectively improved, communication radiation is reduced, and safety, effectiveness and user access fairness of a civil aeroplane mobile communication system are enhanced.

Description

Based on connecting system and method in the civil aviaton mobile communication cabin of airborne bus

Technical field

The present invention relates to the mobile communication technology field, particularly a kind of based on connecting system and method in the civil aviaton mobile communication cabin of airborne bus

Background technology

Along with mobile communication more and more spreads to human lives's every aspect, the mobile communication under the passenger plane environment has also been come into people's the visual field.Civil aviaton's mobile communication has caused the extensive concern of countries in the world as an application of moving communicating field.Directorate of Air of the United States Federal (FAA), Britain CAAC (CAA) and Ka Naiji-Mei Long university realized at 1996,2000,2003 respectively once that the fail safe of mobile communication tested on to passenger plane, found that mobile communication equipment has produced interference in various degree to air environment.For security consideration, the initial policy of formulating of relevant Air Branch is forbidden the mobile communication in the civil aviaton, but does not abandon the plan that realizes, and increasing airline develops corresponding civil aviaton mobile communication system.

2004, company of SITA (SITA), Air Passenger and Tenzing company unite the OnAir company exploitation of establishment and have verified commercial airborne mobile telephone system, by local GSM network of simulation in the cabin, provide effective access function of user.2006, U.S. ARINC company and Norway Telenor company developed jointly a cover aviation mobile communications AeroMobile of system, can realize safely and effectively that the passenger uses mobile phone and PDA awing.Up to the present, one has 6 families provides the service provider of aviation mobile communications to develop the civil aviaton's mobile communication system of oneself, is respectively AeroMobile, OnAir, Aircell, JetBlue, Row44 and ARINC Direct.

Along with the continuous maturation of technology, Air Branch begins aviation mobile communications is lifted a ban.In September, 2006, the european telecommunication committee (ECC) delivers report, thinks that the mobile phone service can use under the Local Area Network environment in aircraft passenger compartment.In the same year, the subordinate's of International Civil Aviation Organization the air communications committee also represents, can make amendment to existing aviation rules, allows to use airborne mobile phone service.Britain, European Union's Air Branch are also revised relevant policies afterwards, allow the user to use the mobile communication service in passenger plane, and wish that each airline can utilize new regulation, make the user enjoy aerial mobile communication service as early as possible.

In November, 2006, United Arab Emirates Emirate airline becomes the first airline that opens function of cellular phone on the machine.What it was installed is the equipment that AeroMobile company provides, existing so far 100,000 multi-users.2008, On Air at world development more than ten user their system on probation, comprising the Shenzhen Airlines of China.On Air plans to install airborne mobile telephone equipment additional on three Air Passenger 320 aircrafts of Shenzhen Airlines, and takes the lead in providing airborne mobile phone service in China before the Olympic Games.In June, 2008, prompt blue airline (JetBlue) provides TV services based on the LiveTV satellite to the passenger.In September, 2008, American Airlines provides Internet access service to the passenger who takes its national distance flight, and what it adopted is the Gogo service of AirCell company.On November 22nd, 2008, VirginAmerica airline of Virgin America begins the Gogo mobile broadband service of AirCell.In February, 2009, Southwest Airlines Co (Southwest Airlines) and Row44 continuation plan are from the first quarter in 2010 release Wi-Fi.Now four airplanes have been carried out service testing, client's product feedback is good.

Along with the development of civil aviaton's mobile communication system and the continuous success of application case, the user has proposed higher demand to airborne mobile communication service quality and function: transmission rate, wider service range, better speech quality faster.From the 64Kbit/s of AeroMobile and the 432Kbit/s of OnAir, to the 1.2-1.9Mbit/s of " GoGo " and LiveTv, to more than the 20Mbit/s of Row44, system's speed improves constantly, and network broadband changes into the development trend into aviation mobile communications.Simultaneously, people wish that civil aviaton's mobile communication system can satisfy many-sided demands such as commercial affairs and amusement.And access network that present civil aviaton's mobile communication system provides and COS are comparatively single, only support a kind of or limited several network single network to insert.Only support GSM mobile handset to insert as AeroMobile and On Air, corresponding voice and telecommunications service are provided; And " GoGo system " only can provide the WiFi service on net.In addition, because channel is the interior elongated channel of a confined space in the cabin, traditional airborne mobile communication system only provides a WAP (wireless access point), has problems such as security of system, the access of marginal position user validity and fairness.

Summary of the invention

(1) technical problem that will solve

The technical problem to be solved in the present invention is: how to realize that system configuration is simple, can expand, and connecting system in the civil aviaton mobile communication cabin of compatible multiple communication network, reach fail safe, validity and fairness that the user inserts simultaneously.

(2) technical scheme

For solving the problems of the technologies described above, the invention provides a kind of based on connecting system in the civil aviaton mobile communication cabin of airborne bus, comprise: airborne bus, switch, router and some access point apparatus, described switch connects airborne bus, described router connects described switch, is used for the exchanges data of airborne bus and vacant lot data chainning or empty day data chain; Described some access point apparatus connect described airborne bus, are used to insert the portable terminal in the cabin.

Wherein, described access point apparatus comprises: administration module, and the control interface and the wireline interface that are connected with described administration module also comprise the radio-frequency module that is connected with described administration module, the antennal interface that is connected with described radio-frequency module.

Wherein, described radio-frequency module comprises: GSM submodule, CDMA2000 submodule, WCDMA submodule, TD-SCDMA submodule and LTE submodule, WiFi submodule, WiMax submodule, bluetooth submodule and infrared submodule.

Wherein, the distance of any two access point apparatus in described some access point apparatus is more than 10 times of long wavelength in the employed radio wave of described access point apparatus.

The invention also discloses a kind of above-mentioned cut-in method that utilizes, may further comprise the steps based on connecting system in the civil aviaton mobile communication cabin of airborne bus:

Available connection in the wireless signal coverage of the access point apparatus in the mobile terminal to search cabin;

Described portable terminal is selected the wireless access way in the available connection, and utilizes selected wireless access way to send connection request to access point apparatus;

Whether described access point apparatus is legal according to the portable terminal that the checking of the user right in described connection request request connects, verify that legal back submits described connection request according to service network type in the described connection request to corresponding service network, and after described portable terminal returns confirmation, connect.

The invention also discloses a kind of above-mentioned cut-in method that utilizes, may further comprise the steps based on connecting system in the civil aviaton mobile communication cabin of airborne bus:

Access point apparatus is the ferret out portable terminal in the wireless signal coverage;

Determine to send connection request to it behind the destination mobile terminal;

Described destination mobile terminal is agreed to insert and connect with described access point apparatus after receiving connection request.

Wherein, board and the deliver from vault process in also comprise the switching of portable terminal between ground base station and described access point apparatus, concrete mode is:

When boarding, the signal strength signal intensity and the quality of access point apparatus monitoring portable terminal, when signal is higher than first thresholding, described portable terminal keep with ground base station between be connected in, setting up channel between described access point apparatus and the described portable terminal is connected, after entering the cabin, described access point apparatus is if monitor the portable terminal signal and be higher than second thresholding, then cuts off and being connected of described portable terminal by ground network notice ground base station.

During deliver from vault, the signal strength signal intensity and the quality of access point apparatus monitoring portable terminal, when signal was lower than second thresholding, access point apparatus was keeping notifying ground base station and portable terminal to connect with when portable terminal is connected by ground network; Access point apparatus is if monitor signal when being lower than first thresholding, then cuts off and being connected of portable terminal.

Wherein, the described first thresholding value is :-80dB～-60dB, the second thresholding value is :-40dB～-20dB.

Wherein, after connecting, the portable terminal that connects adopts the high specific folding with the signal of n access point apparatus receiving, the diversity branch of n signal is carried out the phase place adjustment, and, obtain merging the signal envelope of output, wherein n 〉=2 by the addition of predetermined gain coefficient homophase.

(3) beneficial effect

The present invention has designed a kind of based on connecting system in the civil aviaton mobile communication cabin of airborne bus, and is simple in structure than other system, can expand, and compatible multiple communication network.System interface has many radio-frequency structures, than other onboard networks access way, can satisfy the access demand in several data source.Simultaneously, this system's utilization is distributed in distribute a plurality of access points and portable terminal of different spatial and forms rake and receive, can effectively improve communication quality, reduce the communication radiation than single access point in the cabin, and stop the marginal position user and inserted unjust phenomenon.Fail safe, validity and the fairness of system have been guaranteed.

Description of drawings

Fig. 1 is a kind of based on connecting system in the civil aviaton mobile communication cabin of airborne bus (Mobile Linked System in Aeroplane, MLSA) structural representation of the embodiment of the invention;

Fig. 2 is an AP structural representation among Fig. 1;

Fig. 3 is the method flow diagram that portable terminal connects access point among the MLSA shown in Figure 1;

Fig. 4 is the another kind of method flow diagram that portable terminal connects access point among the MLSA shown in Figure 1;

Fig. 5 be board or the deliver from vault process in soft handover schematic diagram between ground base station BS and the AP;

Fig. 6 is the schematic diagram that Boeing737-300 uses MLSA of the present invention;

Fig. 7 is two kinds of access scheme schematic diagrames of 4CMT among Fig. 6 (seat 4C);

Fig. 8 is the ber curve figure of two kinds of access schemes among Fig. 7;

Fig. 9 is 4CMT and two kinds of access scheme schematic diagrames of 11CMT among Fig. 6.

Embodiment

Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention.

As shown in Figure 1, of the present invention based on (the Mobile Linked System in Aeroplane of connecting system in the civil aviaton mobile communication cabin of airborne bus, MLSA) comprising: airborne bus, the switch that is connected with airborne bus and some as access point (Access Point, AP) access point apparatus, airborne bus is the cable network carrier of data communication in the cabin, connect the AP and the switch that are distributed in different spatial in the cabin, simplify system configuration and wiring, and provide arrangement and expanded function flexibly for many AP.AP provides the wireless signal transmission receiving function, and (Mobile Terminal is MT) to the visit of airborne bus to support portable terminal.Network signal sends by airborne bus, and the compiling through the AP product converts the electrical signal to radio signals send out, and forms the covering of wireless network, and effective radio access node is provided.Switch is responsible for the exchanges data of airborne bus and vacant lot data chainning or empty day data chain, thereby realizes being connected of MLSA and land mobile communication network.MT comprises mobile phone, notebook and POS machine, be used for stopping from or deliver to the wireless transmission of network, and the ability of terminal equipment is fitted to the part of wireless transmission.MT can be connected with two or more AP of signal the best simultaneously, forms rake, effectively improves communication quality.This shows that MLSA comprises airborne bus and two networks of radio communication, be one and support the transmitting-receiving of several data source and have mobile communication access system (not comprising the vacant lot data chainning) in the strong cabin of diversity feature, the high communication quality, extensibility.

AP is a WAP (wireless access point), provide MT to have access to the function of spider lines, as shown in Figure 2, form by antennal interface, wireline interface, radio-frequency module, control interface and administration module, compiled the function of physical layer, ciphering user data, authentification of user, QoS, network management, roaming technology and other application layers of WLAN.Antennal interface and wireline interface are supported effective access of airborne wireless communication network and bus.Radio-frequency module has multiple modulating mode, supports the modulating/demodulating of data source under the multiple network agreement.The control serial ports links to each other with computer, supports that the user disposes the AP administration module.Administration module is supported MAC authentication, data encryption, QoS, webmaster and application layer management.

MLSA communication protocol comprises AP protocol stack and airborne bus protocol stack.The AP protocol stack is made of physical layer, link layer, network layer, transport layer and application layer, and is as shown in table 1.Wherein, physical layer has defined radio wave and two kinds of wireless mediums of infrared ray.MAC layer in the link layer has defined the mac frame form under the multiple network; The LLC layer adopts IEEE802.10 network security and secret standard and IEEE802.2 generic logic controlling links standard.The network layer of Infrared, WiFi, Bluetooth and WiMAX and transport layer protocol are formulated according to network layer and the transport layer protocol of TCP/IP, and application layer is a Packet data service; GSM, CDMA2000, WCDMA, TD-SCDMA and LTE adopt circuit to be connected, and application layer is speech business and telecommunication service.Airborne bus protocol stack comprises physical layer, link layer and network layer part, and is as shown in table 2.

Table 1AP protocol stack

The airborne bus protocol stack of table 2

MT in the cabin will be linked into MLSA by AP and comprise following dual mode:

Mode one: as shown in Figure 3, comprise step:

MT at first searches for the available connection in the AP wireless signal coverage in the cabin.MLSA provides multiple wireless network connected mode, dissimilar MT can discern be connected with the network that uses different.

MT selects wireless access way according to certain priority rule in available network, preferential as MT default setting, User Defined and signal strength signal intensity.MT sends connection request according to selected wireless access way to AP then.The content of request comprises user right and the service network type of MT itself.

AP discerns user identity after receiving the request of MT, submits user's request to the related service network after confirming as the validated user under this authority.Last AP returns confirmation and connects with MT.

Mode two: as shown in Figure 4, comprise step:

AP is ferret out MT in the wireless signal coverage.

Determine to send connection request to MT after the target.

The user agreed to insert and connect with AP after MT received connection request.

When inserting MLSA by AP, MLSA of the present invention also provides a kind of level and smooth access service, the user board or the deliver from vault process in realize the soft handover of MT between ground base station BS and AP, guarantee the continuity of telex network, handoff procedure as shown in Figure 5.

The user boards in the process, signal strength signal intensity and the quality of AP monitoring MT, when signal is higher than the first thresholding TH1, MT keep with base station (BS) between be connected in, set up channel between AP and the MT and be connected the continuity and the communication quality of assurance telex network.After the user entered the cabin, AP monitored the MT signal and is higher than the second thresholding TH2, cut off and being connected of MT by ground network notice BS.

Signal strength signal intensity and the quality of the handoff procedure of user when deliver from vault: AP monitoring MT, when signal was lower than second thresholding, AP was keeping notifying BS and MT to connect with when MT is connected by ground network; AP is if monitor signal when being lower than first thresholding, then cuts off and being connected of MT.

Wherein, first thresholding and second thresholding should be determined by test in the cabin: first thresholding depends on the switching access probability, promptly inserts the success rate of new access point (being AP when boarding, is BS during deliver from vault) during soft handover, and this probability demands is high more, and the first thresholding value should be low more; Second thresholding depends on and switch to disconnect probability, promptly disconnects the success rate of original access point (being BS when boarding, is AP during deliver from vault) during soft handover, and this probability demands is high more, and the second thresholding value should be low more.It is high more to switch access probability, and user's mobile communication continuity is good more, but fail safe reduces; It is high more to switch the disconnection probability, and the fail safe of user's mobile communication is high more, but continuity reduces.Therefore, preferably, first thresholding gets-80dB～-60dB between, second thresholding gets-40dB～-20dB between.

Adopt many AP diversity technique among the MLSA, a plurality of incoherent signal copy that MT will receive merges by high specific, and the useful signal energy that obtains after the feasible combination maximizes, and has reduced the error rate of signal.In order to guarantee uncorrelated between a plurality of signal copies, the distance between the AP must be greater than some wavelength even at 10 more than the wavelength.As can be seen from Table 3, the wavelength of radio wave that adopts among the MLSA is a decimetre magnitude or lower, so two AP spacings can be arranged in the following radio wave more than 10 times of long wavelength.

Table 3 radio wave frequency and wavelength table

Network schemer	Frequency	Wavelength
			GSM	900/1800MHz	0.333/0.167m
CDMA2000、WCDMA	1920MHz/2110MHz	0.156/0.142m
			TD-SCDMA	2010MHz	0.149m
WiFi、Bluetooth	2.4GHz	0.125m
			LTE	2.6GHz	0.115m
WiMax	2～66GHz	＜0.15m

After MT receives the mutual incoherent signal copy of n bar of n AP emission, adopt high specific to merge (MRC) technology.After n diversity branch adjusted through phase place, by suitable gain coefficient α _iThe homophase addition, the signal envelope r that obtains merging output is:

$r=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\α}}_i{r}_i$ (formula 1)

Wherein, r _iRepresent each tributary signal amplitude.

The noise power N that merges output is:

$N=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\α}}_i^2{N}_i$ (formula 2)

Wherein, N _iThe noise power of representing each branch road.α _iBy

Determine.

So merge the signal to noise ratio snr of output be:

$\mathrm{SNR}=\frac{{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="HDA0000045489530000041.png,HDA0000045489530000052.png"\; state="\{\{state\}\}">r</figure-callout>}}^2/2}{N}=\frac{{\left(\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{\mathrm{\&alpha;}}_i{r}_i\right)}^2}{2\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{\mathrm{\&alpha;}}_i^2{N}_i}=\frac{{(\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{\mathrm{\&alpha;}}_i\sqrt{N_i}{r}_i/\sqrt{N_i})}^2}{2\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{\mathrm{\&alpha;}}_i^2{N}_i}$ (formula 3)

When

Promptly

The time, signal to noise ratio is got maximum and is:

$\mathrm{SNR}=\frac{\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{\left({\mathrm{\&alpha;}}_i\sqrt{N_i}\right)}^2\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{(r_i/\sqrt{N_i})}^2}{2\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{\mathrm{\&alpha;}}_i^2{N}_i}=\underset{i=1}{\overset{\mathrm{<figure-callout\; id="2"\; label="n\; r\; i"\; filenames="HDA0000045489530000041.png,HDA0000045489530000052.png"\; state="\{\{state\}\}">n</figure-callout>}}{\mathrm{\&Sigma;}}}\frac{r_i^{}}{}\frac{{}_2^{}/2}{N_i}=\underset{i=1}{\overset{n}{\mathrm{\&Sigma;}}}{\mathrm{SNR}}_i$ (formula 4)

Because fixed-site between each MT and the AP in the cabin in the flight course, can think that AP is to the decline B of MT in every branch road _TRiBe fixed value, represent by following empirical equation (obtaining) by a large amount of result of the test matches:

$B_{\mathrm{TRi}}=\frac{A}{d_i^k}$ (formula 5)

Wherein, d _iDistance between expression AP and the MT, A represents in the cabin signal fadeout on the communication time unit path between two fixed points, relevant with network schemer, temperature, pressure parameter and intermediate obstacles shadow effect in the cabin, k has reflected the speed degree of path fading, determine by the cabin test, usually between the k value 2～4.

MT receives the power output P of every branch road _RiCan be by single AP transmitting power P _TBe expressed as:

$P_{\mathrm{Ri}}=B_{\mathrm{RTi}}{\mathrm{\&alpha;}}_i^2{P}_T=\frac{A{\mathrm{\&alpha;}}_i^2}{d_i^k}{P}_T$ (formula 6)

So the branch road signal to noise ratio is:

${\mathrm{SNR}}_i=\frac{P_{\mathrm{Ri}}}{{\mathrm{\&alpha;}}_i^2{N}_i}=\frac{A{\mathrm{\&alpha;}}_i^2{P}_{\mathrm{Ti}}}{d_i^k{\mathrm{\&alpha;}}_i^2{N}_i}=\frac{{\mathrm{AP}}_{\mathrm{Ti}}}{d_i^k{N}_i}$ (formula 7)

If each branch road signal to noise ratio is consistent to be SNR ₀, have:

SNR=n * SNR (formula 8)

Thus can be rough think the signal to noise ratio that adopts diversity (n bar diversity branch) be do not adopt diversity n doubly.

Because the decline in the cabin between each MT and the AP immobilizes, and can adopt the awgn channel model to calculate the error rate.Under awgn channel, adopt the error rate and the signal to noise ratio relation of different modulating mode as shown in table 4.

Error rate when table 4AWGN environment adopts the different modulating mode down

Wherein, $Q\left(x\right)=\frac{1}{2}\mathrm{erfc}\left(\frac{x}{\sqrt{2}}\right),$ $\mathrm{erfc}\left(x\right)=\frac{2}{\sqrt{\mathrm{\&pi;}}}{\&Integral;}_x^{\&infin;}{e}^{-{\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="HDA0000045489530000041.png,HDA0000045489530000052.png"\; state="\{\{state\}\}">t</figure-callout>}}^2}\mathrm{dt}$

Similarly, MT transmit by n AP receive and the noise that merges output when the error rate can obtain identical result by identical derivation.

On Boeing737-300, use the MLSA experiment below.As shown in Figure 6, along arranging 4 AP on the airborne bus of axis, cabin, the AP spacing is 8m, and switch is arranged in tail, and bus is 3m apart from the MT average height, and the k during calculating in (formula 5) is taken as 2.Consider two users (4CMT, 11CMT) on seat 4C and the 11C, all use CDMA mobile phone (QPSK modulation system), from (1) AP transmitting power (fail safe), (2) received signal error rate (validity), three aspects of (3) MT transmitting power (fairness) many AP diversity scheme and the single AP scheme of MLSA are compared respectively.

1, security of system checking

Transmitting power when relatively 4CMT (error rate is identical) under identical serviceability adopts two kinds of schemes to insert (as shown in Figure 6), transmitting power is little, then illustrates other space equipment to be disturbed little, and system has higher fail safe.

(1) 4CMT only inserts AP1

The decline distance

Noise power is N ₀, A is the relevant constant of environment in the cabin, transmitting power is P _Ta, calculate signal to noise ratio snr _aAnd error rate BER _a,

${\mathrm{BER}}_a=Q\left(\sqrt{{2\mathrm{SNR}}_a}\right)=Q\left(\sqrt{2\frac{{\mathrm{AP}}_{\mathrm{Ta}}}{d_{4C1}^2{N}_0}}\right)$ (formula 9)

(2) 4CMT inserts AP1 and AP2 simultaneously

Decline is apart from d _4C2=d _4C1=5m, two branch road noise powers all are N ₀, A is the relevant constant of environment in the cabin, transmitting power is P _Tb, calculate signal to noise ratio snr _bAnd error rate BER _b,

${\mathrm{BER}}_b=Q\left(\sqrt{{2\mathrm{SNR}}_b}\right)=Q\left(\sqrt{4\frac{{\mathrm{AP}}_{\mathrm{Tb}}}{d_{4C1}^2{N}_0}}\right)$ (formula 10)

Relatively (formula 9) and (formula 10) is by BER _a=BER _bDraw:

P _Tb＝P _Ta/2

Promptly adopt many AP diversity scheme of MLSA littler, verified the fail safe of system than the transmitting power of single AP scheme.

2, system effectiveness checking

Relatively (4CMT transmits signal to noise ratio snr under identical environment for use _TIdentical) error rate of the received signal of (as shown in Figure 7) when adopting two kinds of schemes to insert, the error rate is hanged down illustrative system validity height.

(1) 4CMT only inserts AP1

${\mathrm{BER}}_a=Q\left(\sqrt{{2\mathrm{SNR}}_a}\right)=Q\left(\sqrt{2\frac{{\mathrm{AP}}_T}{d_{4C1}^2{N}_0}}\right)=Q\left(\sqrt{\frac{2A}{d_{4C1}^2}{\mathrm{SNR}}_T}\right)$

(2) 4CMT inserts AP1 and AP2 simultaneously

${\mathrm{BER}}_b=Q\left(\sqrt{{2\mathrm{SNR}}_b}\right)=Q\left(\sqrt{4\frac{{\mathrm{AP}}_T}{d_{4C1}^2{N}_0}}\right)=Q\left(\sqrt{\frac{4A}{d_{4C1}^2}{\mathrm{SNR}}_T}\right)$

Draw the ber curve of two kinds of schemes, as shown in Figure 8, as can be seen, adopt many AP diversity scheme of MLSA littler, verified the validity of system than the error rate of single AP scheme.

3, system's fairness checking

Transmitting power when relatively two mobile subscribers of 4CMT and 11CMT (error rate is identical) under identical serviceability adopt two kinds of schemes to insert (as shown in Figure 9), the MT transmitting power has reflected the energy (power consumption) that MT consumes, two users' transmitting power is approaching more, and the fairness of system is good more.

(1) 4CMT and 11CMT only insert AP1

The decline distance

Noise power is N ₀, transmitting power is respectively P _Ta4And P _Ta11, the error rate is expressed as:

${\mathrm{BER}}_{a4}=Q\left(\sqrt{{2\mathrm{SNR}}_{a4}}\right)=Q\left(\sqrt{2\frac{{\mathrm{AP}}_{\mathrm{Ta}4}}{d_{4C1}^2{N}_0}}\right)$

${\mathrm{BER}}_{a11}=Q\left(\sqrt{{2\mathrm{SNR}}_{a11}}\right)=Q\left(\sqrt{2\frac{{\mathrm{AP}}_{\mathrm{Ta}11}}{d_{11C1}^2{N}_0}}\right)$

The condition that is equated by the error rate obtains

Be P _Ta11=6.12P _Ta4

In order to obtain the identical receiving terminal error rate, the 11CMT transmitting power will reach 6.12 times of 4CMT as can be seen, is inequitable for the user of 11C.

(2) 4CMT inserts AP1 and AP2 simultaneously, and 11CMT inserts AP2 and AP3 simultaneously, and decline is apart from d _4C2=d _4C1=d _11C2=d _11C3=5m, noise power is N ₀, by

$Q\left(\sqrt{4\frac{{\mathrm{AP}}_{\mathrm{Tb}4}}{d_{4C1}{N}_0}}\right)={\mathrm{BER}}_b=Q\left(\sqrt{4\frac{{\mathrm{AP}}_{\mathrm{Tb}11}}{d_{11C2}{N}_0}}\right)$

The transmitting power that draws 4CMT and 11CMT is identical, is fair fully for these two custom systems promptly.The position of 4CMT and 11CMT is symmetrical fully, thinks that channel is identical, for other position user, adopts similar approach to calculate and can obtain the approximately equalised result of transmitting power.

Comparison by above three aspects can draw, and many AP diversity scheme that MLSA adopted all is better than traditional single AP access scheme on fail safe, validity and fairness.

Above execution mode only is used to illustrate the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; under the situation that does not break away from the spirit and scope of the present invention; can also make various variations and modification; therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.

Claims (9)

1. one kind based on connecting system in the civil aviaton mobile communication cabin of airborne bus, it is characterized in that, comprise: airborne bus, switch, router and some access point apparatus, described switch connects airborne bus, described router connects described switch, is used for the exchanges data of airborne bus and vacant lot data chainning or empty day data chain; Described some access point apparatus connect described airborne bus, are used to insert the portable terminal in the cabin.

2. as claimed in claim 1 based on connecting system in the civil aviaton mobile communication cabin of airborne bus, it is characterized in that, described access point apparatus comprises: administration module, and the control interface and the wireline interface that are connected with described administration module, also comprise the radio-frequency module that is connected with described administration module, the antennal interface that is connected with described radio-frequency module.

3. as claimed in claim 2 based on connecting system in the civil aviaton mobile communication cabin of airborne bus, it is characterized in that described radio-frequency module comprises: GSM submodule, CDMA2000 submodule, WCDMA submodule, TD-SCDMA submodule and LTE submodule, WiFi submodule, WiMax submodule, bluetooth submodule and infrared submodule.

4. as each is described based on connecting system in the civil aviaton mobile communication cabin of airborne bus in the claim 1～3, it is characterized in that the distance of any two access point apparatus in described some access point apparatus is more than 10 times of long wavelength in the employed radio wave of described access point apparatus.

5. one kind is utilized each described cut-in method based on connecting system in the civil aviaton mobile communication cabin of airborne bus in the described claim 1～4, it is characterized in that, may further comprise the steps:

Available connection in the wireless signal coverage of the access point apparatus in the mobile terminal to search cabin;

Described portable terminal is selected the wireless access way in the available connection, and utilizes selected wireless access way to send connection request to access point apparatus;

Whether described access point apparatus is legal according to the portable terminal that the checking of the user right in described connection request request connects, verify that legal back submits described connection request according to service network type in the described connection request to corresponding service network, and after described portable terminal returns confirmation, connect.

6. one kind is utilized each described cut-in method based on connecting system in the civil aviaton mobile communication cabin of airborne bus in the described claim 1～4, it is characterized in that, may further comprise the steps:

Access point apparatus is the ferret out portable terminal in the wireless signal coverage;

Determine to send connection request to it behind the destination mobile terminal;

Described destination mobile terminal is agreed to insert and connect with described access point apparatus after receiving connection request.

7. as claim 5 or 6 described cut-in methods, it is characterized in that, board and the deliver from vault process in also comprise the switching of portable terminal between ground base station and described access point apparatus, concrete mode is:

When boarding, the signal strength signal intensity and the quality of access point apparatus monitoring portable terminal, when signal is higher than first thresholding, described portable terminal keep with ground base station between be connected in, setting up channel between described access point apparatus and the described portable terminal is connected, after entering the cabin, described access point apparatus is if monitor the portable terminal signal and be higher than second thresholding, then cuts off and being connected of described portable terminal by ground network notice ground base station.

During deliver from vault, the signal strength signal intensity and the quality of access point apparatus monitoring portable terminal, when signal was lower than second thresholding, access point apparatus was keeping notifying ground base station and portable terminal to connect with when portable terminal is connected by ground network; Access point apparatus is if monitor signal when being lower than first thresholding, then cuts off and being connected of portable terminal.

8. cut-in method as claimed in claim 7 is characterized in that, the described first thresholding value is :-80dB～-60dB, the second thresholding value is :-40dB～-20dB.

9. as claim 5 or 6 described cut-in methods, it is characterized in that, after connecting, the portable terminal that connects adopts the high specific folding with the signal of n access point apparatus receiving, the diversity branch of n signal is carried out the phase place adjustment, and, obtain merging the signal envelope of output, wherein n 〉=2 by the addition of predetermined gain coefficient homophase.

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