CN104125270A - Channel navigation information transmission method based on heterogeneous networks - Google Patents

Abstract

The invention discloses a channel navigation information transmission method based on heterogeneous networks. The method comprises: self-adaptively collecting network information according to the speed of a ship, recording specific locations of the passed channels and the network information thereof, and sending to a data service center; if the navigation information categories have no priority, selecting a weight factor corresponding to the category of the navigation information to be sent, if the navigation information categories have priority, selecting the weight factor corresponding to the category, with the highest priority, of the navigation information; performing normalization processing on parameters in the network information, computing network cost of each detected network, and selecting the network used by the navigation information to be sent according to the network cost and variation trend of the network. According to the channel navigation information transmission method based on heterogeneous networks, self-adaptively network parameter sampling is achieved, the network required by business is selected according to the weight factor, the switching cost and the variation trend of the network, and different requirements of different kinds of business on the network are met.

Description

A kind of Navigation in Navigable information transferring method based on heterogeneous network

Technical field

The present invention relates to Navigation in Navigable message area, be specifically related to a kind of Navigation in Navigable information transferring method based on heterogeneous network.

Background technology

It is the basis that ensures safety of ship, unimpeded, convenient and economic navigation that navigation channel information is accurately provided, and communication network is as the important carrier of navigation channel communication, and the requirements such as its stability, coverage, transmission range seem particularly important.The transmission channel that navigation channel information spinner is wanted at present comprises: the radio sensing networks such as AIS channel, satellite navigation system, 3G/4G public network, wifi and zigbee, all there is the problem of communication distance and coverage in single transmission channel, cannot transmit in communication blind district navigation information, as: the communication distance of AIS system transmitting is limited; Although satellite navigation system wide coverage, its communication cost costliness; 3G/4G public network only limits to offshore ships that transport because its base station is limited. and coverage is narrow etc.The problem that transmission exists for above single network, associated mechanisms has started to build heterogeneous network waterborne and has carried out the transmission of Navigation in Navigable information both at home and abroad, as:

1) a kind of method research article numbering 1006-7973 (2012) 06-0086-02 about dwindling land AIS base station monitoring blind area is in order to reduce land AIS base station monitoring blind area, in literary composition, pass through Beidou satellite navigation system transfer watercraft AIS information, and judge according to the time that does not receive watercraft AIS information whether boats and ships enter land AIS base station monitoring blind area, forward watercraft AIS data program thereby determine whether to start Beidou satellite navigation system; In order to reduce Beidou satellite navigation system data traffic, forward corresponding AIS information by certain rules selection simultaneously.The shortcoming of this technical scheme judges whether to enter blind area by not receiving AIS information time, thereby determine to start Beidou satellite navigation system and forward AIS data, this changing method time delay is large, can not perceive in time network change, easily causes part AIS information dropout.

2), based on wireless local area network technology, build a wireless communication platform.Then by Winsock technology, realize the networking between boats and ships and Surveillance center.The boats and ships of AIS are not installed by controller and the high-gain authority antenna of wireless network card have been installed, dynamic and static boats and ships information are sent to base station, then be transmitted to other boats and ships by base station.Increase communication signal strength in base station with power amplifier, base station receives simultaneously installs the information that AIS boats and ships send by VHF and the message that AIS boats and ships send by WLAN (wireless local area network) is not installed.Shortcoming is that system need to adopt the high-power AP of omnidirectional, high-gain exterior aerial, power amplifier and wireless bridge, and cost is high.

3) the automatic identification monitoring system of a kind of boats and ships, application number 200810249819.6 publication number CN101441471A make up the deficiency of conventional ship navigator in communication distance and reliability, in on record coverage and long and narrow water channel can adopt public network GPRS/cdma communication, the boats and ships that exceed case platform coverage adopt VHF/SOTDMA private network self-organizing communication, expand marine communication scope.It,, by vessel position update mode, selects VHF/SOTDMA or GPRS/CDMA.Its scheme shortcoming is that Navigation in Navigable information can not be transmitted when in AIS blind area and public network blind area.

Summary of the invention

The present invention is directed to current boats and ships in navigation because of the network coverage a little less than complete or signal, cause boats and ships and monitor service center and administrative center, and other boats and ships between information cannot be in time, accurately transmit, a kind of Navigation in Navigable information transferring method based on heterogeneous network has been proposed.

For addressing the above problem, the invention provides a kind of Navigation in Navigable information data transmission system based on heterogeneous network, comprising:

Main control module, respectively with AIS module, zigbee transport module, 3G/4G module, wifi wireless module, navigation information acquisition module is connected.Be used for AIS module, zigbee transport module, 3G/4G module, wifi wireless module, navigation information acquisition module is controlled.

AIS module, is connected with main control module, for receiving and send data.

Zigbee transport module, is connected with main control module, and at communication blind district, the navigation channel information data transmission that will transmit is to connected equipment.

3G/4G module, is connected with main control module, by carrying out transfer of data between 3G/4G network and data service center.

Wifi wireless module, is connected with main control module, carries out transfer of data by wifi wireless network and data center.

Navigation information acquisition module, Information Monitoring difference can be divided into: navigation mark node, morning and evening tides node, hydrology node, meteorological node, dynamic object node, network node, voice and video node.Wherein network node is for Real-time Collection network parameter information.

Data center server, processes the navigation information that above-mentioned cordless communication network obtains and sends instruction to boats and ships.

Under the environment that repeats to cover at heterogeneous network, in order to give full play to heterogeneous network performance advantage separately, allow boats and ships always can access best network in difference navigation information category situation, thereby ensure that boats and ships obtain optimum communication experiences.

A kind of Navigation in Navigable information transferring method based on heterogeneous network is also provided, comprises the following steps:

Step 1: according to speed of the ship in metres per second self adaptation collection network information, the parameter in the network information comprises received signal strength, the network bandwidth, connects time delay, packet loss and service fee;

Step 2: record particular location and the network information thereof through navigation channel, be sent to data service center;

Step 3: judge whether navigation information category exists priority, if there is not priority in navigation information category, select the weight factor corresponding to classification of navigation information to be sent to enter step 4, if navigation information category exists priority to choose the corresponding weight factor of navigation information category that priority level is the highest, enter step 4;

Step 4: the parameter in each selected network of network information is normalized to the normalized value that obtains each parameter, according to the weight factor of choosing in normalized value and step 3, each network of network cost value that calculating detects, obtain optimum alternative network, according to the network cost value of the variation tendency of current network type on course line and optimum alternative network type, the network cost value of current network, optimum alternative network, select navigation information network used to be sent.

Step 1 as above comprises the following steps:

The translational speed of step 1.1, Ship ' terminal, in cycle T _ainside obtain N instantaneous velocity sampling, the instantaneous velocity of N sampling is got to average and obtain average speed

Step 1.2: according to following formula according to the average speed of boats and ships terminal adjust network parameter acquisition time interval delta T;

$\mathrm{\ΔT}=\left\{\begin{array}{c}0,\stackrel{\‾}{V}=0\\ T_{\min }+(T_{\max }-T_{\min }){(1-\frac{\stackrel{\‾}{V}}{V_{\max }})}^p,\stackrel{\‾}{V}>0\end{array}\right\}$

Wherein T _min, T _maxbe respectively boats and ships terminal and carry out minimum permission time and the maximum permission time that network switches, V _maxthe maximum speed value of the boats and ships that can support for current service network, be the average speed of boats and ships terminal within the sampling period, p is exponential factor;

Step 1.3: according to the time interval of parameter acquisition, obtain network parameter values.

Normalized in step 4 as above is based on following formula:

$Q_{n\_S}=\ln \frac{\frac{1}{S_n}}{\max (\frac{1}{S_1},\frac{1}{S_2},...,\frac{1}{S_m})}$

$Q_{n\_B}=\ln \frac{\frac{1}{B_n}}{\max (\frac{1}{B_1},\frac{1}{B_2},...,\frac{1}{B_m})}$

$Q_{n\_D}=\ln \frac{D_n}{\max (D_1,D_2,...,D_m)}$

$Q_{n\_E}=\ln \frac{E_n}{\max (E_1,E_2,...,E_m)}$

$Q_{n\_C}=\ln \frac{C_n}{\max (C_1,C_2,...,C_m)}$

Wherein, Q _{n_S}, Q _{n_B}, Q _{n_D}, Q _{n_E}, Q _{n_C}be respectively the received signal strength of the information of opening the navigation or air flight in network n, the network bandwidth, connects time delay, the normalized value of packet loss and service fee, S _n, B _n, D _n, E _n, C _nrepresent the received signal strength of network n to be calculated, bandwidth, connects time delay, packet loss and service fee, and m is the quantity that participates in the access network calculating.

Network cost value F in step 4 as above _{n_s}calculating based on following formula:

F _{n_s}

＝w _{n_s_S}Q _{n_S}+w _{n_s_B}Q _{n_B}+w _{n_s_D}Q _{n_D}+w _{n_s_E}Q _{n_E}+w _{n_s_C}Q _{n_C}

Wherein, Q wherein _{n_S}, Q _{n_B}, Q _{n_D}, Q _{n_E}, Q _{n_C}be respectively the received signal strength of network n to be calculated, bandwidth, connects time delay, packet loss, the normalized value of service fee; w _{n_s_S}, w _{n_s_B}, w _{n_s_D}, w _{n_s_E}, w _{n_s_C}be respectively Q _{n_S}, Q _{n_B}, Q _{n_D}, Q _{n_E}, Q _{n_C}corresponding weight factor, and w _{n_s_S}+ w _{n_s_B}+ w _{n_s_D}+ w _{n_s_E}+ w _{n_s_C}=1, choose the network of network cost value minimum as optimum alternative network.

The navigation information network used to be sent of selecting in step 4 as above comprises the following steps:

The size of step 4.1, more optimum alternative network cost value and current interconnection network cost value, if optimum alternative network cost value is more than or equal to current network cost value, rests on current network; If optimum alternative network cost value is less than current network cost value, enter step 4.2;

Step 4.2, obtain the current network normalized value Q of the received signal strength in navigation channel forwardly of data service center storage ^* _{j_S}, obtain the optimum alternative network normalized value Q of the received signal strength in navigation channel forwardly of data service center storage ^* _{h_S},

Step 4.3, the following formula of basis obtain switching cost parameter value H:

Wherein, Q _{j_S}for the normalized value of the received signal strength of current network j, Q _{h_S}for the normalized value of the received signal strength of current optimum alternative network h;

Step 4.4, relatively add optimum alternative network cost value after switching cost parameter value H and the size of current network cost value, if add the optimum alternative network cost value after switching cost parameter to be less than current network cost value, i.e. H+F _{h_s}< F _{j_s}carry out and switch, otherwise, continue to stay current network, wherein F _{j_s}represent the current network cost value of navigation information category s, F _{h_s}represent the current optimum alternative network cost value of navigation information category s.

The present invention compared with prior art, has the following advantages and effect:

1) by AIS transmission network, wifi transmission network, 3G/4G transmission network, zigbee transmission network combines, make up the problem of single network communication distance and coverage, give full play to the advantage of each network, effectively increase the transmission range of Navigation in Navigable information, complete efficiently Navigation in Navigable communication, improve vessel motion fail safe.

2) prior art network discovery phase adopts the even network information of measuring in the fixing sampling time conventionally, have the excessive problem of sample frequency, cause terminal frequently to open detection network information, terminal energy consumption is too high, if sample frequency is too low, cannot ensure again to find in time and select network.The present invention proposes a kind of speed adaptive parameter acquisition algorithm, according to the sample frequency of the adaptive adjustment network discovery phase of moving velocity of terminal, with energy consumption and the contradiction on the opportunity of discovery of balance discovering network, make terminal with minimum energy consumption cost discovering network accurately and timely.

3) existing prediction handoff algorithms terminal, according to the network parameter that receives the front t moment, is inferred the network cost function in t+1 moment, carries out switching judging.This algorithm shortcomings is preparatory can not be guaranteed of prediction.This programme proposes a kind of anticipation scheme, gather in the process of moving and upload on navigation channel the network information to data service center by boats and ships, data service center is set up network information database, pre-judging module is by the speed of a ship or plane and the course information of boats and ships, by the information of the front network stored in Network Capture data, services, the actual network information of obtaining and the front network information are compared, obtain the variation tendency of current network of living in and want the trend of handover network, provide data basis for network switches, can adjust accurately switching cost parameter.

4) the present invention is on traditional cost function algorithm basis, the switch decision algorithm switching based on navigation information category has been proposed, switching cost parameter in conjunction with anticipation module and control is flexibly carried out intelligent decision, can carry out advance decision and effectively reduce pingpang handoff number of times.Traditional based on cost function handoff algorithms, the handover network after selecting by judgement can only be an optimum result on the whole, but can not ensure that the navigation information of each class can obtain best network service.The present invention refine to the concrete navigation information category of terminal by switching unit, and navigation information category can arrange network parameter weight factor in conjunction with oneself requirement, can ensure more accurately that so each navigation information category chooses most suitable handover network.In the switch decision algorithm switching based on navigation information category, add the cost parameter of flexible control, control flexibly switching cost for different situations, and traditional switching cost algorithm, once algorithm definition, form is fixed, be not suitable for the demand of the different demands, particularly different business of different user.

Brief description of the drawings

Fig. 1 one is based on heterogeneous network Navigation in Navigable information transmission system frame diagram;

The transfer of data schematic diagram of Fig. 2 data transmission method of the invention process;

Fig. 3 navigation information transferring method of the invention process;

Fig. 4 network discovery phase parameter acquisition of the present invention adaptive strategy;

Fig. 5 heterogeneous network decision algorithm of the present invention flow chart;

Embodiment

All foundations technological essence of the present invention, to simple modification made for any of the above embodiments, equivalent variations or modification, all belongs to protection scope of the present invention.

Fig. 1 is a kind of based on heterogeneous network Navigation in Navigable information transmission system frame diagram, comprises data service center, AIS base station, 3G/4G base station, wifi wireless network, zigbee wireless network, passing ships terminal.Its domain of the existence can be divided into wifi wireless network coverage area, region as of living in ship terminal 101; Only AIS overlay area, as ship terminal 102; Only 3G/4G overlay area, as ship terminal 103; AIS and the common overlay area of 3G/4G network, as ship terminal 104; AIS and all uncovered area of 3G/4G network, as ship terminal 105.

Ship terminal 101 is at wifi wireless network coverage area, adopt wifi to upload the multidate information of boats and ships own, real time sensor data, the network information, video in ship's navigation, audio files etc., upgrade river figure, sea chart etc., can receive the navigation channel information of Upstream Navigation Waterway simultaneously, hydrographic information, weather information, the network information etc.

Passing ships 102 are present in AIS overlay area, adopt AIS transmission network to upload the multidate information of boats and ships itself, hydrometeorological information, the network information, for the voice in ship's navigation, video file is temporarily kept at this locality,, is uploading successively when having 3G/4G network or wifi network's coverage area until ship running, can receive the navigation channel information of Upstream Navigation Waterway simultaneously, hydrographic information, weather information, the network information etc.

Passing ships 103 are present in 3G/4G network's coverage area, adopt 3G/4G Internet Transmission network to upload the multidate information of boats and ships itself, hydrometeorology information, the network information, the voice in ship's navigation, video information, can receive the navigation channel information of Upstream Navigation Waterway simultaneously, hydrographic information, weather information, the network information etc.

Passing ships 104 are present in AIS and the common overlay area of 3G/4G network, adopt AIS transmission network to upload the multidate information of boats and ships itself, hydrometeorology information, the network information, adopts 3G/4G network to upload the voice in ship's navigation, video information, can receive the navigation channel information of Upstream Navigation Waterway simultaneously, hydrographic information, weather information, the network information etc.

Passing ships 105 are present in AIS and all uncovered area of 3G/4G network, by zigbee network by local boats and ships multidate information, hydrometeorological information, the navigation such as network information communication is to ship around, around ship, as 104, forwards navigation information to data service center.

The transfer of data schematic diagram of Fig. 2 data transmission method of the invention process, the data transmission system shown in figure comprises:

Main control module, respectively with wifi wireless module, 3G/4G module, AIS module, zigbee mixed-media network modules mixed-media, navigation information acquisition module is connected.Be used for wifi wireless module, 3G/4G module, AIS module, zigbee mixed-media network modules mixed-media, navigation information acquisition module is controlled.

AIS module, is connected with main control module, receives and send data by VHF omnidirectional antenna.

Zigbee transport module, is connected with main control module, and at communication blind district, the navigation channel information data transmission that will transmit is to connected equipment.

3G/4G module, is connected with main control module, by carrying out transfer of data between 3G/4G network and data service center.

Wifi wireless module, is connected with main control module, and marine informized degree improves, and equipment room data communication is more and more frequent, and data volume is increasing.Carry out transfer of data by wifi wireless network and data center.

Navigation information acquisition module, Information Monitoring comprises that the network parameter information of network node collection and the positional information of positional information node collection are for building waters network information database to these means of communication.

Data center server, for obtaining navigation information and sending instruction to boats and ships by above-mentioned cordless communication network.

Navigation information transferring method step of the invention process is as follows:

Step 1: as shown in Figure 3, according to speed of the ship in metres per second self adaptation collection network information, the network information comprises received signal strength, the network bandwidth, connects time delay, packet loss E and service fee.Network information gathering is normally by Terminal Network Interface collection network information.Traditional network information gathering adopts the even network parameter of measuring in the fixing sampling time, if sample frequency is excessive, cause terminal frequently to open detection network information, cause terminal energy consumption problem, if sample frequency is too low, cannot ensure again to find timely and select network shortcoming to be the high-speed mobile due to user, user has entered into new network, but also do not collect the parameter information of this network, postponed network switching time, reduced switching efficiency.The present invention adopts speed adaptive collection network parameter, adjust the sample frequency of network parameter according to the speed of boats and ships translational speed, speed is faster, just with shorter sampling time collection network parameter, speed is slower, with larger time collection network parameter, with energy consumption and the contradiction on the opportunity of discovery of balance discovering network, make terminal with minimum energy consumption cost discovering network accurately and timely, thereby reach energy-conservation object.

Step 1.1: as shown in Figure 4, use the velocity measuring technique of boats and ships terminal, the translational speed of computing terminal.The measurement of oceangoing ship moving velocity of terminal in ship's navigation process, is variable motion with regard to its whole motion process, and therefore key is to obtain the average speed of mobile node in fixed sample period.Utilize the speed measuring function cycle T of boats and ships terminal self _ainside obtain N instantaneous velocity sampling, the instantaneous velocity of N sampling is got to average, this average is exactly the average speed of boats and ships terminal.Suppose that the sampling period is T _a, the average speed of boats and ships terminal middle V _ifor i sample value speed of boats and ships terminal, N is instantaneous velocity number of samples.

Step 1.2: as shown in Figure 4, adjust network parameter acquisition time interval according to the translational speed of boats and ships terminal.

Network parameter sampling time interval adaptive strategy function is

$\mathrm{\&Delta;T}=\left\{\begin{array}{c}0,\stackrel{\&OverBar;}{V}=0\\ T_{\min }+(T_{\max }-T_{\min }){(1-\frac{\stackrel{\&OverBar;}{V}}{V_{\max }})}^p,\stackrel{\&OverBar;}{V}>0\end{array}\right\}$ Wherein T _min, T _maxbe respectively boats and ships terminal and carry out minimum permission time and the maximum permission time that network switches, V _maxthe maximum speed value of the boats and ships that can support for current service network, be the average speed of boats and ships terminal within the sampling period, p is exponential factor, gets according to actual needs different value.When shipping high speed moves, larger, Δ T is just less, can be with speed acquisition network parameter faster; When speed of the ship in metres per second is 0, such as boats and ships are time out of service, acquisition time is made as to 0, represent not collection network parameter, just use current network transmission data.

Step 1.3: according to the time interval of parameter acquisition, obtain network parameter values.

Step 2: outside boats and ships data collecting module collected sensor information and voice and video information, also need collection network information, record particular location and the network information thereof through navigation channel, pass through 3G/4G, AIS, or wireless network is sent to data service center, and the network information that data service center is uploaded according to boats and ships and present position are depicted as waters network information database, near ship by the network information sending to, realizes sharing of the network information on navigation channel.

Step 3: judge whether navigation information category exists priority, and navigation information category comprises word mail, real time sensor data, historical picture video, real-time video picture and voice application.Suppose that the navigation information category that current boats and ships terminal will be transmitted has voice application and real time sensor data, if voice application priority is high higher than the priority of sensing data, first carrying out the network judgement of voice application selects, due to the variability of network, when voice application is carried out after switching, the necessary Resurvey network information, is continuing network judgement selection to sensing data.If navigation information category does not exist priority, select the weight factor corresponding to classification of navigation information to be sent to enter step 4.If navigation information category exists priority to choose the corresponding weight factor of navigation information category that priority level is the highest, enter step 4.

Step 4: heterogeneous network decision algorithm provided by the invention.First heterogeneous network decision algorithm uses the various heterogeneous network informations of collection, comprise RSS acknowledge(ment) signal intensity, available bandwidth, network connects time delay, packet loss, service fee, the above-mentioned network information is normalized, according to having or not and the different different weight factors of the navigation information category selection network information of the priority of navigation information category, calculate the network cost value of diverse network, then control flexibly switching cost parameter in conjunction with anticipation module and adjudicate, the navigation information network used that real-time selection is to be sent.

Step 4.1: as shown in Figure 5, network information gathering also carries out network information normalized, and the network information comprises received signal strength, the network bandwidth, connects time delay, packet loss and service fee.The network information considers can increase too much the computation complexity of cost function, causes adjudicating time delay; The network information considers very little, and can completely evaluating network quality is not chosen again.

Received signal strength (S) refers to mobile terminal from base station or the power value of the wireless signal that wireless router receives, generally represent the situation of the communication chain quality between this parameter reaction base station and mobile terminal to a great extent with the performance number that receives signal.

Connect time delay (D) and refer to that data arrive the time difference that receiving terminal produces out after various network nodes and transmission medium from transmitting terminal.Different classes of very large to connecting delay requirement difference in navigation information, so be necessary to consider propagation delay time.

Wireless network connects bandwidth (B) and refers to that interior wireless communication system of unit interval can offer the maximum data transfer rate of terminal.Different isomerization net provides bandwidth difference, and bandwidth is the key factor that ensures that can certain class business carry out.

Packet loss (E) refers to the packet that signal is lost in transmitting procedure, the ratio of shared transmission packet.Different business is not identical for the degrees of tolerance of packet loss yet.

Traffic services expense (C), for commercial ships transport, the communication service expense producing in transportation is also to need bring into cost, heterogeneous networks cost of use difference is larger, so set it as one of factor of consideration.

Each parameter normalization, different parameters has different meanings for heterogeneous networks, if without normalized, is directly used in calculating and easily causes serious unfairness.

The base station transmitting power of various heterogeneous networks with and coverage have a long way to go, the RSS received signal strength of heterogeneous networks has different standards.Q _{n_S}, Q _{n_B}, Q _{n_D}, Q _{n_E}, Q _{n_C}be respectively the received signal strength of the information of opening the navigation or air flight in network n, the network bandwidth, connects time delay, the normalized value of five judgement factors of packet loss and service fee.S _n, B _n, D _n, E _n, C _nreceived signal strength that Wei network n, bandwidth, connects time delay, packet loss and service fee.The quantity of the access network that current participation is calculated is m, n ∈ m, S ₁～S _mbe respectively the received signal strength of network 1～m; B ₁～B _mbe respectively the bandwidth of network 1～m; D ₁～D _mbe respectively the connection time delay of network 1～m; E ₁～E _mbe respectively the packet loss of network 1～m; C ₁～C _mbe respectively the service fee of network 1～m; Some parameters are the bigger the better, some parameters are the smaller the better, for example received signal strength and bandwidth are to be the bigger the better, but for connecting time delay, packet loss, service fee is the smaller the better, does not add processing and directly adds algorithm can make the result that obtains nonsensical, and therefore intensity and bandwidth are got reciprocal processing to received signal.

$Q_{n\_S}=\ln \frac{\frac{1}{S_n}}{\max (\frac{1}{S_1},\frac{1}{S_2},...,\frac{1}{S_m})}$

$Q_{n\_B}=\ln \frac{\frac{1}{B_n}}{\max (\frac{1}{B_1},\frac{1}{B_2},...,\frac{1}{B_m})}$

$Q_{n\_D}=\ln \frac{D_n}{\max (D_1,D_2,...,D_m)}$

$Q_{n\_E}=\ln \frac{E_n}{\max (E_1,E_2,...,E_m)}$

$Q_{n\_C}=\ln \frac{C_n}{\max (C_1,C_2,...,C_m)}$

Wherein, S _n, B _n, D _n, E _n, C _nrepresent the received signal strength of network n to be calculated, bandwidth, connects time delay, packet loss and service fee.

Step 4.2: navigation information category is selected, navigation information category comprises word mail, real time sensor data, historical picture video, real-time video picture, voice application.Word mail feature is to time delay not requirement substantially, but very high to the requirement of the error rate; Real time sensor error rates of data and propagation delay time require high, so the shared weight of the error rate and propagation delay time is high; Historical picture video, the network bandwidth is leading indicator, allows certain error rate, so network bandwidth proportion is high; Real-time video picture and voice application, propagation delay time and the network bandwidth are main Service Quality Metrics, so the shared weight of the network bandwidth and propagation delay time is high.Different navigation information category received signal strength S, network bandwidth B, connects time delay D, packet loss E and the shared weighted of service fee C.According to the navigation priority of information category or the sequencing of navigation information to be sent, different navigation information categories is selected the different weight factor of the network information.

Step 4.3: calculate heterogeneous network cost value for navigation information category, comprise current network cost value and alternative network cost value, alternative network refers to the remaining network that does not comprise current network in the all-network of current existence, such as the network of current existence has AIS network, 3G/4G network, wifi wireless network, current transmission navigation information category s's is AIS network, alternative network refers to 3G/4G network and wifi wireless network, and the concrete grammar of its calculating is as follows:

F is that network provides the needed cost of navigation information category s

$F_{n\_s}=\underset{k}{\mathrm{\&Sigma;}}{w}_{n\_s\_k}{Q}_{n\_k}$

$\underset{k}{\mathrm{\&Sigma;}}{w}_{n\_s\_k}=1$

F _{n_s}for network n to be calculated provides cost corresponding to navigation information category s, Q _{n_k}the normalized value of the judgement factor k of network n to be calculated, w _{n_s_k}that network n to be calculated provides the corresponding weight factor of navigation information category s (judgement factor k is S, B, D, E, C).

$\begin{array}{c}{F}_{n\_s}=\underset{k}{\mathrm{\&Sigma;}}{w}_{n\_s\_k}{Q}_{n\_k}\\ =w_{n\_s\_S}{Q}_{n\_S}+w_{n\_s\_B}{Q}_{n\_B}+w_{n\_s\_D}{Q}_{n\_D}+w_{n\_s\_E}{Q}_{n\_E}+w_{n\_s\_C}{Q}_{n\_C,}\end{array}$ Wherein Q _{n_S}, Q _{n_B}, Q _{n_D}, Q _{n_E}, Q _{n_C}be respectively the received signal strength of network n to be calculated, bandwidth, connects time delay, packet loss, service fee; w _{n_s_S}, w _{n_s_B}, w _{n_s_D}, w _{n_s_E}, w _{n_s_C}be respectively Q _{n_S}, Q _{n_B}, Q _{n_D}, Q _{n_E}, Q _{n_C}the weight factor of attribute, wherein weight is adjustable according to different navigation information categories, and w _{n_s_S}+ w _{n_s_B}+ w _{n_s_D}+ w _{n_s_E}+ w _{n_s_C}=1.From alternative network, choose the network of network cost value minimum as optimum alternative network.

Step 4.4: the size of more optimum alternative network cost value and current interconnection network cost value, if optimum alternative network cost value is more than or equal to current network cost value, rest on current network, if alternative network cost value is less than current network cost value, enter step 4.5.

Step 4.5: pre-judging module is by the speed of a ship or plane and the course information of boats and ships, the normalized value of the received signal strength of front, the navigation channel network of storing by Network Capture data service center, the normalized value of the received signal strength in the normalized value of the received signal strength in the actual network information of obtaining and the front network information is compared, obtain the variation tendency of normalized value of the received signal strength of current network of living in and the normalization of the received signal strength of the optimum alternative network that will switch is worth variation tendency.

Q _{j_S}for the normalized value of the received signal strength of current network j, j ∈ m.Q ^* _{j_S}for the current network j normalized value of the received signal strength in navigation channel forwardly.Q _{h_S}for the normalized value of the received signal strength of current optimum alternative network h, h ∈ m.Q ^* _{h_S}for the optimum alternative network h normalized value of the received signal strength in the track of navigation channel forwardly.

Step 4.6: select flexibly switching cost parameter according to judging module.Adding cost parameter is for simulating reality situation, in vertical handover procedure, certainly will cause the decline of communication quality, in the time that needs switch, add switching cost parameter, then compare, if adding the result that decision algorithm calculates after cost parameter is to be unworthy switching, internetwork gap does not also reach larger stage, and judgement is not switched, and switches if decision algorithm is still judged to carry out, represent gap and enough large between network, now carrying out to switch is also worth.Add switching cost parametric procedure as follows:

If boats and ships are current, for navigation information category s, transmission adopts is network j, for navigation information category s pre-switch be network h, switching cost parameter value is that H selection principle is as follows:

H ₀for default network handoff parameter; H ₁for away from current network handoff parameter; H ₂enter the handoff parameter of current network, and H ₂>H ₀>H ₁; represent that data service center storing current network j received signal strength normalized value in navigation channel forwardly, represent that data service center does not have store current network j received signal strength normalized value in navigation channel forwardly; represent that data service center storing the current optimum alternative network received signal strength normalized value in track forwardly, represent that data service center do not store the current optimum alternative network received signal strength normalized value in track forwardly.

Due to received signal strength being normalized when operation, get that inverse operates, so the less expression received signal strength of the normalized value of received signal strength is stronger, the closer to network.If represent that data service center storing the normalized value of the received signal strength of front network j and front network h, and represent that boats and ships are away from current network j, and near optimum alternative network h, reduce switching cost parameter, selecting switching cost parameter is H ₁; If represent that data service center storing the normalized value of the received signal strength of front network j and front network h, and represent that boats and ships are near current network j, and away from optimum alternative network h, increase switching cost parameter, selecting switching cost parameter is H ₂; If remove above-mentioned two situations other situations in addition, if data service center is not stored the normalized value of the received signal strength of front network j or front network h, or boats and ships are away from current network, simultaneously also away from optimum alternative network or boats and ships near current network, also in close alternative network, switching cost is selected default value H simultaneously ₀

F _{j_s}represent the current network cost value of navigation information category s, F _{h_s}represent the current optimum alternative network cost value of navigation information category s.Adding the cost value of current optimum alternative network after switching cost parameter is H+F _{h_s}.

Step 4.7: relatively add the size of optimum alternative network cost value and current network cost value after switching cost parameter, if add the optimum alternative network cost value after switching cost parameter to be less than current network cost value, (H+F _{h_s}< F _{j_s}) carry out and switch, otherwise, continue to stay current network.

Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendments or supplement or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.

Claims (5)

1. the Navigation in Navigable information transferring method based on heterogeneous network, is characterized in that, comprises the following steps:

Step 1: according to speed of the ship in metres per second self adaptation collection network information, the parameter in the network information comprises received signal strength, the network bandwidth, connects time delay, packet loss and service fee;

Step 2: record particular location and the network information thereof through navigation channel, be sent to data service center;

Step 3: judge whether navigation information category exists priority, if there is not priority in navigation information category, select the weight factor corresponding to classification of navigation information to be sent to enter step 4, if navigation information category exists priority to choose the corresponding weight factor of navigation information category that priority level is the highest, enter step 4;

Step 4: the parameter in each selected network of network information is normalized to the normalized value that obtains each parameter, according to the weight factor of choosing in normalized value and step 3, each network of network cost value that calculating detects, obtain optimum alternative network, according to the network cost value of the variation tendency of current network type on course line and optimum alternative network type, the network cost value of current network, optimum alternative network, select navigation information network used to be sent.

2. a kind of Navigation in Navigable information transferring method based on heterogeneous network according to claim 1, is characterized in that, described step 1 comprises the following steps:

The translational speed of step 1.1, Ship ' terminal, in cycle T _ainside obtain N instantaneous velocity sampling, the instantaneous velocity of N sampling is got to average and obtain average speed

Step 1.2: according to following formula according to the average speed of boats and ships terminal adjust network parameter acquisition time interval delta T;

$\mathrm{\&Delta;T}=\left\{\begin{array}{c}0,\stackrel{\&OverBar;}{V}=0\\ T_{\min }+(T_{\max }-T_{\min }){(1-\frac{\stackrel{\&OverBar;}{V}}{V_{\max }})}^p,\stackrel{\&OverBar;}{V}>0\end{array}\right\}$

Wherein T _min, T _maxbe respectively boats and ships terminal and carry out minimum permission time and the maximum permission time that network switches, V _maxthe maximum speed value of the boats and ships that can support for current service network, be the average speed of boats and ships terminal within the sampling period, p is exponential factor;

Step 1.3: according to the time interval of parameter acquisition, obtain network parameter values.

3. a kind of Navigation in Navigable information transferring method based on heterogeneous network according to claim 1, is characterized in that, the normalized in described step 4 is based on following formula:

$Q_{n\_S}=\ln \frac{\frac{1}{S_n}}{\max (\frac{1}{S_1},\frac{1}{S_2},...,\frac{1}{S_m})}$

$Q_{n\_B}=\ln \frac{\frac{1}{B_n}}{\max (\frac{1}{B_1},\frac{1}{B_2},...,\frac{1}{B_m})}$

$Q_{n\_D}=\ln \frac{D_n}{\max (D_1,D_2,...,D_m)}$

$Q_{n\_E}=\ln \frac{E_n}{\max (E_1,E_2,...,E_m)}$

$Q_{n\_C}=\ln \frac{C_n}{\max (C_1,C_2,...,C_m)}$

Wherein, Q _{n_S}, Q _{n_B}, Q _{n_D}, Q _{n_E}, Q _{n_C}be respectively the received signal strength of the information of opening the navigation or air flight in network n, the network bandwidth, connects time delay, the normalized value of packet loss and service fee, S _n, B _n, D _n, E _n, C _nrepresent the received signal strength of network n to be calculated, bandwidth, connects time delay, packet loss and service fee, and m is the quantity that participates in the access network calculating.

4. a kind of Navigation in Navigable information transferring method based on heterogeneous network according to claim 3, is characterized in that, the network cost value F in described step 4 _{n_s}calculating based on following formula:

F _{n_s}

＝w _{n_s_S}Q _{n_S}+w _{n_s_B}Q _{n_B}+w _{n_s_D}Q _{n_D}+w _{n_s_E}Q _{n_E}+w _{n_s_C}Q _{n_C}

Wherein, Q wherein _{n_S}, Q _{n_B}, Q _{n_D}, Q _{n_E}, Q _{n_C}be respectively the received signal strength of network n to be calculated, bandwidth, connects time delay, packet loss, the normalized value of service fee; w _{n_s_S}, w _{n_s_B}, w _{n_s_D}, w _{n_s_E}, w _{n_s_C}be respectively Q _{n_S}, Q _{n_B}, Q _{n_D}, Q _{n_E}, Q _{n_C}corresponding weight factor, and w _{n_s_S}+ w _{n_s_B}+ w _{n_s_D}+ w _{n_s_E}+ w _{n_s_C}=1, choose the network of network cost value minimum as optimum alternative network.

5. a kind of Navigation in Navigable information transferring method based on heterogeneous network according to claim 4, is characterized in that, the navigation information network used to be sent of selecting in described step 4 comprises the following steps:

The size of step 4.1, more optimum alternative network cost value and current interconnection network cost value, if optimum alternative network cost value is more than or equal to current network cost value, rests on current network; If optimum alternative network cost value is less than current network cost value, enter step 4.2;

Step 4.2, obtain the current network normalized value Q of the received signal strength in navigation channel forwardly of data service center storage ^* _{j_S}, obtain the optimum alternative network normalized value Q of the received signal strength in navigation channel forwardly of data service center storage ^* _{h_S},

Step 4.3, the following formula of basis obtain switching cost parameter value H:

Wherein, Q _{j_S}for the normalized value of the received signal strength of current network j, Q _{h_S}for the normalized value of the received signal strength of current optimum alternative network h;

Step 4.4, relatively add optimum alternative network cost value after switching cost parameter value H and the size of current network cost value, if add the optimum alternative network cost value after switching cost parameter to be less than current network cost value, i.e. H+F _{h_s}< F _{j_s}carry out and switch, otherwise, continue to stay current network, wherein F _{j_s}represent the current network cost value of navigation information category s, F _{h_s}represent the current optimum alternative network cost value of navigation information category s.