CN104125270B - A kind of Navigation in Navigable information transferring method based on heterogeneous network - Google Patents
A kind of Navigation in Navigable information transferring method based on heterogeneous network Download PDFInfo
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Abstract
The invention discloses a kind of Navigation in Navigable information transferring method based on heterogeneous network, adaptively acquires the network information according to speed of the ship in metres per second, records specific location and its network information by navigation channel, be sent to data service center；If priority is not present in information category of opening the navigation or air flight, the corresponding weight factor of classification of navigation information to be sent is selected, chooses weight factor corresponding to the highest navigation information category of priority level if navigation information category is there are priority；Parameter in the network information is normalized, the network cost value of each network detected is calculated, according to network cost value, the variation tendency of network, selects network used in navigation information to be sent.The present invention realizes that adaptive network parameter sampling meets the different demands for network of different business according to network needed for weight factor, switching cost, network change trend selection business.
Description
Technical field
The present invention relates to Navigation in Navigable message areas, and in particular to a kind of Navigation in Navigable information transmission based on heterogeneous network
Method.
Background technique
There is provided accurate navigation channel information is to guarantee the basis of safety of ship, unimpeded, convenient and economic navigation, and communication network
As the important carrier of navigation channel information transmission, the requirements such as stability, coverage area, transmission range are then particularly important.Mesh
The preceding main transmission channel of navigation channel information includes: AIS channel, satellite navigation system, 3G/4G public network, wifi and zigbee
There is communication distance and coverage area in equal wireless sensor networks, single transmission channel, open the navigation or air flight and believe in communication blind district
Breath can not transmit, such as: the information transmission range of AIS system transmitting is limited；Although satellite navigation system wide coverage, it is logical
Believe somewhat expensive；It is narrow etc. that 3G/4G public network is only limitted to offshore ships that transport coverage area since its base station is limited.For with
The transmission of upper single network there are the problem of, domestic and international associated mechanisms have begun building heterogeneous network waterborne and carry out Navigation in Navigable letter
The transmission of breath, such as:
1) a kind of about technique study article number 1006-7973 (2012) 06- for reducing the land base station AIS blind area of monitoring
0086-02 passes through Beidou satellite navigation system transfer in text to reduce land AIS base station blind area of monitoring
Watercraft AIS information, and judge whether ship enters the land base station AIS and monitor according to the time for not receiving watercraft AIS information
Blind area, to decide whether to start Beidou satellite navigation system forwarding watercraft AIS data program；While in order to reduce big-dipper satellite
Guidance system data flow passes through certain corresponding AIS information of regular selective forwarding.The shortcomings that this technical solution, is not by
AIS information time is received to determine whether, to determine starting Beidou satellite navigation system forwarding AIS data, being somebody's turn to do into blind area
Switching method delay is big, cannot perceive network change in time, and part AIS information is be easy to cause to lose.
2) it is based on wireless local area network technology, builds a wireless communication platform.Then by Winsock technology, ship is realized
Networking between oceangoing ship and monitoring center.The ship of AIS is not installed by being mounted with the control machine and high-gain permission of wireless network card
The dynamic and static information of ship is sent to base station, then is transmitted to other ships by base station by antenna.In base station power amplifier
Increase communication signal strength, base station receives installation AIS ship oceangoing ship by the VHF information sent simultaneously and do not install AIS ship oceangoing ship
The message sent by WLAN.The disadvantage is that system needs to put using the high-power AP of omnidirectional, high-gain exterior aerial, power
Big device and wireless bridge, it is at high cost.
3) a kind of ship automatic identification monitoring system, 200810249819.6 publication number CN101441471A of application number make up
Tradition navigation equipment peculiar to vessel is in the deficiency of communication distance and reliability, and on record coverage area is interior and long and narrow water channel can be adopted
With public network GPRS/cdma communication, the ship beyond case platform coverage area uses VHF/SOTDMA private network ad-hoc communication, expands ship
Oceangoing ship communication range.It is by vessel position update mode, to select VHF/SOTDMA or GPRS/CDMA.Its scheme the disadvantage is that
When being in the blind area AIS and public network blind area, Navigation in Navigable information not can be carried out transmission.
Summary of the invention
The present invention is being navigated by water for current ship because the network coverage is not complete or signal is weak, leads to ship and monitoring service center
And between administrative center and other ships information can not in time, accurate delivery, it is logical to propose a kind of navigation channel based on heterogeneous network
Navigate information transferring method.
To solve the above problems, the present invention provides a kind of Navigation in Navigable information data transmission system based on heterogeneous network,
Include:
Main control module, respectively with AIS module, zigbee transmission module, 3G/4G module, wifi wireless module, navigation letter
Acquisition module is ceased to be connected.For to AIS module, zigbee transmission module, 3G/4G module, wifi wireless module, navigation information adopted
Collection module is controlled.
AIS module, is connected with main control module, for sending and receiving data.
Zigbee transmission module is connected with main control module, in communication blind district, the navigation channel information data transmission that will transmit
To connected equipment.
3G/4G module, is connected with main control module, by carrying out data biography between 3G/4G network and data service center
It is defeated.
Wifi wireless module, is connected with main control module, is carried out data transmission by wifi wireless network with data center.
Navigation information acquisition module, acquisition information difference can be divided into: navigation mark node, tide node, hydrology node, meteorology section
Point, dynamic object node, network node, voice and video node.Wherein network node for acquiring net-work parameter information in real time.
Data center server handles the navigation information that above-mentioned cordless communication network obtains and issues instruction to ship.
In the environment of heterogeneous network repeats to cover, in order to give full play to the respective performance advantage of heterogeneous network, ship is allowed
Optimal network is always had access in different navigation information categories, to ensure that ship obtains optimal communication body
It tests.
A kind of Navigation in Navigable information transferring method based on heterogeneous network is also provided, comprising the following steps:
Step 1: the network information adaptively being acquired according to speed of the ship in metres per second, the parameter in the network information includes that reception signal is strong
Degree, network bandwidth connect time delay, packet loss and service fee；
Step 2: recording the specific location and its network information by navigation channel, be sent to data service center；
Step 3: judgement navigation information category whether there is priority, if priority, selection is not present in navigation information category
The corresponding weight factor of classification of navigation information to be sent enters step 4, chooses if navigation information category is there are priority
Weight factor corresponding to the highest navigation information category of priority level, enters step 4；
Step 4: the parameter in the network information of selected each network is normalized to obtain returning for each parameter
One change value calculates the network cost value of each network detected according to the weight factor chosen in normalized value and step 3,
Optimal alternative network is obtained, according to variation tendency, the current network of current network type on course line and optimal alternative network type
Network cost value, the network cost value of optimal alternative network, select network used in navigation information to be sent.
Step 1 as described above the following steps are included:
The movement speed of step 1.1, Ship ' terminal, in cycle TaIt is interior to obtain N number of instantaneous velocity sampling, it is adopted to N number of
The instantaneous velocity of sample takes mean value to obtain average speed
Step 1.2: according to following formula according to the average speed of ship terminalAdjust network parameter acquisition time interval
ΔT；
Wherein Tmin, TmaxRespectively the minimum allowable time of ship terminal execution network switching and maximum allowable time, Vmax
For the maximum speed value for the ship that current service network can be supported,It is the average speed of ship terminal during the sampling period, p
It is exponential factor；
Step 1.3: according to the time interval of parameter acquisition, obtaining network parameter values.
Normalized in step 4 as described above is based on following formula:
Wherein, Qn_S, Qn_B, Qn_D, Qn_E, Qn_CThe received signal strength for information of opening the navigation or air flight in respectively network n, network bandwidth,
Connect time delay, the normalized value of packet loss and service fee, Sn、Bn、Dn、En、CnIndicate that the reception signal of network n to be calculated is strong
Degree, bandwidth connect time delay, packet loss and service fee, and m is the quantity for participating in the access network calculated.
Network cost value F in step 4 as described aboven_sCalculating be based on following formula:
Fn_s
=wn_s_SQn_S+wn_s_BQn_B+wn_s_DQn_D+wn_s_EQn_E+wn_s_CQn_C
Wherein, wherein Qn_S, Qn_B, Qn_D, Qn_E, Qn_CThe received signal strength of network n respectively to be calculated, bandwidth, even
Connect time delay, packet loss, the normalized value of service fee；wn_s_S, wn_s_B, wn_s_D, wn_s_E, wn_s_CRespectively Qn_S, Qn_B, Qn_D,
Qn_E, Qn_CCorresponding weight factor, and wn_s_S+wn_s_B+wn_s_D+wn_s_E+wn_s_C=1, choose the smallest net of network cost value
Network is as optimal alternative network.
In step 4 as described above select network used in navigation information to be sent the following steps are included:
Step 4.1, more optimal alternative network cost value and it currently is connect the size of network cost value, if optimal alternative net
Network cost value is more than or equal to current network cost value, then rests on current network；If optimal alternative network cost value is less than current
Network cost value, then enter step 4.2；
Normalizing of the current network that step 4.2, acquisition data service center store in the received signal strength in front navigation channel
Change value Q* j_S, obtain data service center storage optimal alternative network front navigation channel received signal strength normalized value
Q* h_S,
Step 4.3 obtains switching cost parameter value H according to the following formula:
Wherein, Qj_SFor the normalized value of the received signal strength of current network j, Qh_SFor current optimal alternative network h's
The normalized value of received signal strength；
Step 4.4 compares optimal alternative network cost value and current network cost value after switching cost parameter value H is added
Size, if be added switching cost parameter after optimal alternative network cost value be less than current network cost value, i.e. H+Fh_s<
Fj_sSwitching is then executed, conversely, then continue to stay in current network, wherein Fj_sIndicate the current network cost of navigation information category s
Value, Fh_sIndicate navigation information category s currently optimal alternative network cost value.
Compared with prior art, the present invention having the following advantages that and effect:
1) by AIS transmission network, wifi transmission network, 3G/4G transmission network, zigbee transmission network combines, makes up
The problem of single network communication distance and coverage area, gives full play to the advantage of each network, effective to increase Navigation in Navigable letter
The transmission range of breath improves vessel motion safety to be efficiently completed the transmission of Navigation in Navigable information.
2) prior art network discovery phase generallys use in the fixed sampling time and uniformly measures the network information, exists and adopts
The excessive problem of sample frequency causes terminal frequently to open detection network information, and terminal energy consumption is excessively high, if sample frequency is too low, again
Discovery in time and selection network are not can guarantee.The invention proposes a kind of speed adaptive parameter acquisition algorithms, are moved according to terminal
The sample frequency of the adjustment network discovery phase of dynamic speed adaptive, to balance energy consumption and the discovery opportunity of discovery network
Contradiction makes the discovery network of terminal accurately and timely with the smallest energy penalty.
3) existing prediction handoff algorithms terminal is according to the network parameter for receiving preceding t moment, to infer the t+1 moment
Network cost function switches over judgement.The algorithm shortcomings, which are that prediction is preparatory, cannot be guaranteed.This programme proposes a kind of anticipation
Scheme is acquired in the process of moving by ship and uploads on navigation channel the network information to data service center, data service center
Network information database is established, pre- judging module passes through the speed of a ship or plane and course information of ship, obtains data service by network
The network information actually obtained is compared with the front network information, obtains current institute by the information of the front network of middle storage
Locate the variation tendency of network and want the trend of handover network, provides data basis for network switching, can accurately adjust and cut
Replacement valence parameter.
4) present invention proposes the switching based on navigation information category switching and sentences on the basis of traditional cost function algorithm
Annual reporting law, in conjunction with anticipation module and flexibly the switching cost parameter that controls carries out intelligent decision, be able to carry out advance decision and
It is effective to reduce pingpang handoff number.It is traditional based on cost function handoff algorithms, the handover network after passing through judgement selection is only
Can be on the whole one it is optimal as a result, but cannot be guaranteed every one kind navigation information can obtain best network service.This
Switching unit is refine to the specific navigation information category of terminal by invention, and navigation information category can be arranged in conjunction with oneself requirement
Network parameter weight factor can more accurately guarantee that each navigation information category chooses most suitable handover network in this way.
The cost parameter flexibly controlled is added in variable structure contorl based on navigation information category switching, is flexibly controlled for different situations
Switching cost processed, and traditional switching cost algorithm, algorithm once defining, fix by form, is not suitable for the difference of different user
The demand of demand, especially different business.
Detailed description of the invention
Fig. 1 one kind is based on heterogeneous network Navigation in Navigable information transmission system frame diagram；
The data for the data transmission method that Fig. 2 present invention is implemented transmit schematic diagram；
The navigation information transferring method that Fig. 3 present invention is implemented；
Fig. 4 inventive network discovery phase parameter acquisition adaptive strategy；
Fig. 5 heterogeneous network decision algorithm flow chart of the present invention；
Specific embodiment
All technological essences according to the present invention simple modification, equivalent variations or modification made to the above embodiment, belong to
In protection scope of the present invention.
Fig. 1 is that one kind is based on heterogeneous network Navigation in Navigable information transmission system frame diagram, including data service center,
The base station AIS, the base station 3G/4G, wifi wireless network, zigbee wireless network, passing ships terminal.Its domain of the existence can be divided into
Wifi wireless network coverage area, the region as locating for ship terminal 101；The only overlay area AIS, such as ship terminal 102；Only 3G/
The overlay area 4G, such as ship terminal 103；AIS and 3G/4G network collectively cover region, such as ship terminal 104；AIS and 3G/4G
Network all uncovered areas, such as ship terminal 105.
Ship terminal 101 uploads ship multidate information itself in wifi wireless network coverage area, using wifi, passes in real time
Sensor data, the network information, video in ship's navigation, audio file etc. update river figure, sea chart etc., while can receive upstream
The navigation channel information in navigation channel, hydrographic information, weather information, network information etc..
Passing ships 102 are present in the overlay area AIS, and the multidate information of ship itself, water are uploaded using AIS transmission network
Vigour of style image information, the network information, for the voice in ship's navigation, video file is stored temporarily in local, extremely to ship running
It when having 3G/4G network or wifi network overlay area, is successively being uploaded, while can receive the navigation channel letter of Upstream Navigation Waterway
Breath, hydrographic information, weather information, network information etc..
Passing ships 103 are present in 3G/4G network's coverage area, upload ship itself using 3G/4G network transmission network
Multidate information, hydrometeorological information, the network information, the voice in ship's navigation, video information, while can receive upstream boat
The navigation channel information in road, hydrographic information, weather information, network information etc..
Passing ships 104 are present in AIS and 3G/4G network collectively covers region, upload ship sheet using AIS transmission network
The multidate information of body, hydrometeorological information, the network information upload the voice in ship's navigation, video letter using 3G/4G network
Breath, while can receive the navigation channel information of Upstream Navigation Waterway, hydrographic information, weather information, network information etc..
Passing ships 105 are present in AIS and 3G/4G network all uncovered areas, by zigbee network that ship is local
Multidate information, hydrometeorological information, the navigation such as network information information are transmitted to ship around, and surrounding ship such as 104, then forwarding is logical
Information of navigating is to data service center.
The data for the data transmission method that Fig. 2 present invention is implemented transmit schematic diagram, data transmission system packet shown in figure
It includes:
Main control module, respectively with wifi wireless module, 3G/4G module, AIS module, zigbee network module, navigation letter
Acquisition module is ceased to be connected.For to wifi wireless module, 3G/4G module, AIS module, zigbee network module, navigation information adopted
Collection module is controlled.
AIS module, is connected with main control module, sends and receivees data by VHF omnidirectional antenna.
Zigbee transmission module is connected with main control module, in communication blind district, the navigation channel information data transmission that will transmit
To connected equipment.
3G/4G module, is connected with main control module, by carrying out data biography between 3G/4G network and data service center
It is defeated.
Wifi wireless module, is connected with main control module, and marine informized degree improves, and equipment room data communication is increasingly
Frequently, data volume is increasing.Carried out data transmission by wifi wireless network with data center.
Navigation information acquisition module, acquisition information include the net-work parameter information and positional information node of network node acquisition
The location information of acquisition is used for building waters network information database in this means of communication.
Data center server is instructed for obtaining navigation information by above-mentioned cordless communication network and issuing to ship.
Steps are as follows for the navigation information transferring method that the present invention is implemented:
Step 1: as shown in figure 3, adaptively acquiring the network information according to speed of the ship in metres per second, the network information includes that reception signal is strong
Degree, network bandwidth connect time delay, packet loss E and service fee.Network information gathering is acquired generally by Terminal Network Interface
The network information.Traditional network information gathering is using network parameter is uniformly measured in the fixed sampling time, if sample frequency mistake
Greatly, cause terminal frequently to open detection network information, cause terminal energy consumption problem, if sample frequency is too low, and not can guarantee and
When discovery and selection network deficiencies be the high-speed mobile due to user, user has been introduced into new network, but does not adopt also
The parameter information for collecting the network, has postponed network switching time, reduces switching efficiency.The present invention is adopted using speed adaptive
Collect network parameter, the sample frequency of network parameter is adjusted according to the speed of ship movement speed, speed is faster, just with shorter sampling
Time acquires network parameter, and speed is slower, then acquires network parameter with the biggish time, to balance the energy consumption of discovery network
With the contradiction on discovery opportunity, make the discovery network of terminal accurately and timely with the smallest energy penalty, to reach energy saving purpose.
Step 1.1: as shown in figure 4, with the velocity measuring technique of ship terminal, the movement speed of computing terminal.Oceangoing ship terminal is moved
The measurement of dynamic speed is variable motion for its entire motion process, therefore key is to obtain during ship's navigation
Average speed of the mobile node in fixed sample period.Utilize the speed measuring function cycle T of ship terminal itselfaInterior acquisition is N number of
Instantaneous velocity sampling, takes mean value to the instantaneous velocity of N number of sampling, which is exactly the average speed of ship terminal.Assuming that sampling
Period is Ta, the average speed of ship terminal Middle ViFor i-th of sample value of ship terminal
Speed, N are instantaneous velocity number of samples.
Step 1.2: as shown in figure 4, adjusting network parameter acquisition time interval according to the movement speed of ship terminal.
Network parameter sampling time interval adaptive strategy function is
Wherein Tmin, TmaxRespectively ship terminal executes network
The minimum allowable time of switching and maximum allowable time, VmaxIt is the average speed of ship terminal during the sampling period for the maximum speed value for the ship that current service network can be supported, p is exponential factor, takes different value according to actual needs.Shipping high speed
When mobile, bigger, Δ T, can be with faster speed acquisition network parameter with regard to smaller；When speed of the ship in metres per second be 0, such as ship stop
When operation, then acquisition time is set as 0, expression does not acquire network parameter, just transmits data using current network.
Step 1.3: according to the time interval of parameter acquisition, obtaining network parameter values.
Step 2: ships data acquisition module acquires outside sensor information and voice and video information, it is also necessary to acquire network
Information records specific location and its network information by navigation channel, and by 3G/4G, AIS or wireless network are sent to number
According to service centre, the network information and present position that data service center is uploaded according to ship are depicted as waters network information data
The network information is sent to neighbouring ship by library, and the network information is shared on realization navigation channel.
Step 3: judgement navigation information category whether there is priority, and navigation information category includes word mail, passes in real time
Sensor data, history picture video, real-time video picture and voice application.Assuming that the current navigation information to be transmitted of ship terminal
Classification has voice application and real time sensor data, first if the priority that voice application priority is higher than sensing data is high
The network for first carrying out voice application adjudicates selection, due to the variability of network, after voice application, which executes, to be switched, it is necessary to adopt again
Collect the network information, network judgement selection is being continued to sensing data.If priority is not present in information category of opening the navigation or air flight, select pending
The corresponding weight factor of the classification for the navigation information sent enters step 4.It is chosen if navigation information category is there are priority preferential
Weight factor corresponding to highest-ranking navigation information category, enters step 4.
Step 4: heterogeneous network decision algorithm provided by the invention.Heterogeneous network decision algorithm is first with the various of acquisition
Heterogeneous network information, including RSS receive signal strength, and available bandwidth is connected to the network time delay, packet loss, service fee, to above-mentioned
The network information is normalized, and is selected according to the presence or absence of priority of navigation information category and its different navigation information categories
The different weight factor of the network information is selected, the network cost value of various networks is calculated, flexibly controls and cuts then in conjunction with anticipation module
Replacement valence parameter makes decisions, network used in real-time selection navigation information to be sent.
Step 4.1: as shown in figure 5, network information gathering and carrying out network information normalized, the network information includes connecing
Signal strength is received, network bandwidth connects time delay, packet loss and service fee.The network information considers to will increase cost function too much
Computation complexity, cause adjudicate time delay；The network information considers very little, and can completely evaluation network quality is not chosen.
Received signal strength (S) refers to the power for the wireless signal that mobile terminal is received from base station or wireless router
Value, is generally indicated with receiving the performance number of signal, the communication between the reaction base station and mobile terminal of the parameter largely
The situation of chain quality.
Connection time delay (D), which refers to, to be reached after various network nodes and transmission medium and connects after data come out from transmitting terminal
The time difference that receiving end generates.Different classes of very big to connection delay requirement difference in information of opening the navigation or air flight, it is therefore necessary to consider to transmit
Time delay.
Wireless network connection bandwidth (B) refers to that wireless communication system is capable of providing to the maximum number of terminal in the unit time
According to transmission rate.Different isomerization net provides bandwidth difference, and can bandwidth be the key factor that ensures certain class business and carry out.
Packet loss (E) refers to the data packet that signal is lost in transmission process, the shared ratio for sending data packet.Different business
It is also not identical for the degrees of tolerance of packet loss.
Traffic services expense (C) transports commercial ships, and the communication service expense generated in transportational process is also
Need to be included in cost, heterogeneous networks cost of use difference is larger, so as one of the factor of consideration.
Each parameter normalization, different parameters have different meanings for heterogeneous networks, if directly using without normalized
Serious unfairness is easy to cause in calculating.
The base station transmitting power of various heterogeneous networks and its coverage area have a long way to go, and the RSS of heterogeneous networks receives letter
Number intensity has different standards.Qn_S, Qn_B, Qn_D, Qn_E, Qn_CThe received signal strength for information of opening the navigation or air flight in respectively network n, net
Network bandwidth connects time delay, the normalized value of packet loss and service fee five judgement factors.Sn, Bn, Dn, En, CnIt Wei not network n
Received signal strength, bandwidth connects time delay, packet loss and service fee.The quantity of the current access network for participating in calculating is
M, n ∈ m, S1~SmThe respectively received signal strength of 1~m of network；B1~BmThe respectively bandwidth of 1~m of network；D1~DmRespectively
For the connection time delay of 1~m of network；E1~EmThe respectively packet loss of 1~m of network；C1~CmThe respectively service charge of 1~m of network
With；Some parameters are the bigger the better, and some parameters are the smaller the better, such as received signal strength and bandwidth are to be the bigger the better, but right
In connection time delay, packet loss, service fee be then it is the smaller the better, the untreated result that is directly added into algorithm and can make does not have
It is significant, therefore to received signal strength and the inverted processing of bandwidth.
Wherein, Sn、Bn、Dn、En、CnIndicate 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 selection, navigation information category includes word mail, real time sensor data, history
Picture video, real-time video picture, voice application.Word mail feature is not required substantially time delay, but to the bit error rate
Requirement it is very high；The real time sensor data bit error rate and propagation delay time require height, so weight shared by the bit error rate and propagation delay time
It is high；History picture video, network bandwidth are main indicators, allow certain bit error rate, so network bandwidth proportion is high；It is real
When video pictures and voice application, propagation delay time and network bandwidth are main Service Quality Metrics, so network bandwidth and biography
Weight shared by defeated time delay is high.Difference navigation information category received signal strength S, network bandwidth B, connect time delay D, packet loss E and
Weighted shared by service fee C.According to navigation information category priority or it is to be sent navigation information sequencing,
The different weight factor of the different navigation information category selection network informations.
Step 4.3: calculating heterogeneous network cost value, including current network cost value and alternative net for navigation information category
Network cost value, alternative network refer to there is currently all-network in do not include current network remaining network, such as
Existing network has AIS network, and 3G/4G network, wifi wireless network, what current transmission opened the navigation or air flight information category s is AIS network,
Then alternative network refers to 3G/4G network and wifi wireless network, and the specific method is as follows for calculating:
F is that network provides cost required for navigation information category s
Fn_sThe corresponding cost of navigation information category s, Q are provided for network n to be calculatedn_kIt is sentencing for network n to be calculated
The certainly normalized value of factor k, wn_s_kBe network n to be calculated provide weight factor corresponding to navigation information category s (judgement because
Plain k is S, B, D, E, C).
Wherein Qn_S,
Qn_B, Qn_D, Qn_E, Qn_CThe received signal strength of network n respectively to be calculated, bandwidth connect time delay, packet loss, service charge
With；wn_s_S, wn_s_B, wn_s_D, wn_s_E, wn_s_CRespectively Qn_S, Qn_B, Qn_D, Qn_E, Qn_CThe weight factor of attribute, wherein weight
It is adjustable according to different navigation information categories, and wn_s_S+wn_s_B+wn_s_D+wn_s_E+wn_s_C=1.Net is chosen from alternative network
The smallest network of network cost value is as optimal alternative network.
Step 4.4: more optimal alternative network cost value with currently connect the size of network cost value, if optimal alternative net
Network cost value is more than or equal to current network cost value, then rests on current network, if alternative network cost value is less than current network
Cost value then enters step 4.5.
Step 4.5: pre- judging module passes through the speed of a ship or plane and course information of ship, obtains data service center by network
The normalized value of the received signal strength of network, strong by the reception signal in the network information actually obtained in front of the navigation channel of storage
The normalized value of degree is compared with the normalized value of the received signal strength in the network information of front, and acquisition is presently in network
Received signal strength the variation tendency of normalized value and the received signal strength of the optimal alternative network to be switched return
One changes worth variation tendency.
Qj_SFor the normalized value of the received signal strength of current network j, j ∈ m.Q* j_SIt is current network j in front navigation channel
In received signal strength normalized value.Qh_SFor the normalized value of the received signal strength of current optimal alternative network h, h ∈
m。Q* h_SFor the normalized value of received signal strength of the optimal alternative network h in the track of front navigation channel.
Step 4.6: according to judging module flexible choice switching cost parameter.It is to simulate real feelings that cost parameter, which is added,
Condition certainly will lead to the decline of communication quality in vertical handover procedure, and when needing to switch over, switching cost ginseng is added
Number, then is compared, if be added that decision algorithm after cost parameter calculates the result is that being unworthy switching, internetwork gap is also
Do not reach biggish stage, then judge not switch, if decision algorithm still Predicated execution switches, represent between network gap and
Sufficiently large, executing switching at this time is also worth.It is as follows that switching cost parametric procedure is added:
If ship is currently directed to navigation information category s transmission using network j, for navigation information category s pre-switch
Be network h, switching cost parameter value is that H selection principle is as follows:
H0For default network handoff parameter；H1For far from current network handoff parameter；H2Switching into current network is joined
Number, and H2>H0>H1；Indicate that data service center stores current network j received signal strength in the navigation channel of front and returns
One change value,Indicate that data service center does not have store current network j received signal strength normalizing in the navigation channel of front
Change value；Indicate that data service center stores current received signal strength of the optimal alternative network in front track
Normalized value,Indicate that data service center does not store reception letter of the current optimal alternative network in front track
Number intensity normalized value.
It is inverted to be operated since received signal strength is when being normalized operation, so received signal strength
The smaller expression received signal strength of normalized value it is stronger, closer to network.
IfThen indicate that data service center stores
The normalized value of the received signal strength of front network j and front network h, and indicate ship far from current network j, and
Close to optimal alternative network h, then reduces switching cost parameter, select switching cost parameter for H1；
IfThen indicate that data service center stores
The normalized value of the received signal strength of front network j and front network h, and indicate ship close to current network j, and
Far from optimal alternative network h, then increases switching cost parameter, select switching cost parameter for H2；
If
Other situations other than above-mentioned two situations are removed, if data service center does not store front network j or front network h
Received signal strength normalized value or ship far from current network, while also far from optimal alternative network or
Person's ship is close to current network, while also close to alternative network, then switching cost selects default value H0
Fj_sIndicate the current network cost value of navigation information category s, Fh_sIndicate that navigation information category s is current optimal alternative
Network cost value.The cost value of current optimal alternative network is H+F after addition switching cost parameterh_s。
Step 4.7: comparing the big of optimal alternative network cost value and current network cost value after switching cost parameter is added
It is small, if the optimal alternative network cost value being added after switching cost parameter is less than current network cost value, (H+Fh_s< Fj_s) then
Switching is executed, conversely, then continuing to stay in current network.
Specific embodiment described herein is only an example for the spirit of the invention.The neck of technology belonging to the present invention
The technical staff in domain can make various modifications or additions to the described embodiments or replace by a similar method
In generation, however, it does not deviate from the spirit of the invention or beyond the scope of the appended claims.
Claims (1)
1. a kind of Navigation in Navigable information transferring method based on heterogeneous network, which comprises the following steps:
Step 1: the network information adaptively being acquired according to speed of the ship in metres per second, the parameter in the network information includes received signal strength, net
Network bandwidth connects time delay, packet loss and service fee；
Step 2: recording the specific location and its network information by navigation channel, be sent to data service center；
Step 3: judgement navigation information category whether there is priority, if priority is not present in navigation information category, select pending
The corresponding weight factor of the classification for the navigation information sent enters step 4, chooses if navigation information category is there are priority preferential
Weight factor corresponding to highest-ranking navigation information category, enters step 4；
Step 4: the parameter in the network information of selected each network is normalized to obtain the normalization of each parameter
Value, according to the weight factor chosen in normalized value and step 3, calculates the network cost value of each network detected, obtains
Optimal alternative network, according to the variation tendency of current network type on the course line, variation tendency of optimal alternative network type, current
Network cost value, the network cost value of optimal alternative network of network, select network used in navigation information to be sent,
The step 1 the following steps are included:
The movement speed of step 1.1, Ship ' terminal, in cycle TaIt is interior to obtain N number of instantaneous velocity sampling, to the wink of N number of sampling
Shi Sudu takes mean value to obtain average speed
Step 1.2: according to following formula according to the average speed of ship terminalAdjust network parameter acquisition time interval delta T；
Wherein Tmin, TmaxRespectively the minimum allowable time of ship terminal execution network switching and maximum allowable time, VmaxTo work as
The maximum speed value for the ship that preceding service network can be supported,It is the average speed of ship terminal during the sampling period, p refers to
The number factor；
Step 1.3: according to the time interval of parameter acquisition, network parameter values are obtained,
Normalized in the step 4 is based on following formula:
Wherein, Qn_S, Qn_B, Qn_D, Qn_E, Qn_CThe received signal strength for information of opening the navigation or air flight in respectively network n, network bandwidth, connection
The normalized value of time delay, packet loss and service fee, Sn、Bn、Dn、En、CnIndicate the received signal strength of network n to be calculated,
Bandwidth connects time delay, packet loss and service fee, and m is the quantity for participating in the access network calculated,
Network cost value F in the step 4n_sCalculating be based on following formula:
Fn_s
=wn_s_SQn_S+wn_s_BQn_B+wn_s_DQn_D+wn_s_EQn_E+wn_s_CQn_C
Wherein, wherein Qn_S, Qn_B, Qn_D, Qn_E, Qn_CThe received signal strength of network n respectively to be calculated, bandwidth, when connection
Prolong, packet loss, the normalized value of service fee；wn_s_S, wn_s_B, wn_s_D, wn_s_E, wn_s_CRespectively Qn_S, Qn_B, Qn_D, Qn_E,
Qn_CCorresponding weight factor, and wn_s_S+wn_s_B+wn_s_D+wn_s_E+wn_s_C=1, it chooses the smallest network of network cost value and makees
For optimal alternative network,
Network used in selection navigation information to be sent in the step 4 the following steps are included:
Step 4.1, more optimal alternative network cost value and it currently is connect the size of network cost value, if optimal alternative network generation
Value is more than or equal to current network cost value, then rests on current network；If optimal alternative network cost value is less than current network
Cost value then enters step 4.2；
Normalized value of the current network that step 4.2, acquisition data service center store in the received signal strength in front navigation channel
Q* j_S, obtain data service center storage optimal alternative network front navigation channel received signal strength normalized value Q* h_S,
Step 4.3 obtains switching cost parameter value H according to the following formula:
Wherein, Qj_SFor the normalized value of the received signal strength of current network j, Qh_SFor the reception of current optimal alternative network h
The normalized value of signal strength；
Step 4.4 compares the big of optimal alternative network cost value and current network cost value after switching cost parameter value H is added
It is small, if the optimal alternative network cost value being added after switching cost parameter is less than current network cost value, i.e. H+Fh_s< Fj_sThen
Switching is executed, conversely, then continue to stay in current network, wherein Fj_sIndicate the current network cost value of navigation information category s, Fh_s
Indicate navigation information category s currently optimal alternative network cost value.
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| CN104580370A (en) * | 2014-12-10 | 2015-04-29 | 上海物联网有限公司 | Self-adaptive transmission method and device for multimode gateway for information monitoring system |
| CN104749991B (en) * | 2014-12-21 | 2017-12-12 | 童晓帆 | A kind of engineering machinery remote monitering system |
| CN104569311A (en) * | 2014-12-31 | 2015-04-29 | 北京工业大学 | Novel hierarchical heterogeneous cross-network air quality real-time monitoring model |
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| CN107819676B (en) * | 2017-09-30 | 2021-01-08 | 武汉理工大学 | Intelligent routing device and method based on weighting matrix model |
| CN109412675A (en) * | 2018-09-27 | 2019-03-01 | 南京凯瑞得信息科技有限公司 | Boat-carrying network and device resource control method based on satellite communication |
| CN109413718A (en) * | 2018-11-13 | 2019-03-01 | 胡青 | Optimal digital communication mode selection method under a kind of heterogeneous network environment of ship end |
| CN109996317A (en) * | 2019-03-28 | 2019-07-09 | 武汉理工大学 | Adaptive AIS communication mode control device and method |
| CN110203345A (en) * | 2019-05-31 | 2019-09-06 | 广州中海电信有限公司 | A kind of Ship dynamic situation information transmitting system Shipborne terminal |
| CN111629381A (en) * | 2020-05-27 | 2020-09-04 | 中国交通通信信息中心 | Intelligent ship navigation-oriented multi-communication network networking method |
| CN111917468A (en) * | 2020-06-29 | 2020-11-10 | 西安理工大学 | Method for reducing switching times in VLC/Wi-Fi wireless heterogeneous network |
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| CN114697367B (en) * | 2022-02-21 | 2024-03-22 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Ship propulsion system operation and maintenance system and method based on multi-network fusion remote communication |
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