CN111148172A - Mobile communication antenna-based maritime user access switching method - Google Patents
Mobile communication antenna-based maritime user access switching method Download PDFInfo
- Publication number
- CN111148172A CN111148172A CN202010039129.9A CN202010039129A CN111148172A CN 111148172 A CN111148172 A CN 111148172A CN 202010039129 A CN202010039129 A CN 202010039129A CN 111148172 A CN111148172 A CN 111148172A
- Authority
- CN
- China
- Prior art keywords
- switching
- base station
- communication
- user
- information
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a method for switching marine user access based on a communication-in-motion antenna, which belongs to the technical field of communication and comprises the following steps: switching information acquisition, namely periodically acquiring base station information, user ship information and communication-in-motion antenna state information by a control mechanism; switching decision, namely evaluating alternative base stations through a switching decision algorithm and selecting an optimal base station; and performing switching execution, wherein the communication-in-motion antenna executes switching action according to the result of the switching control strategy calculation. The invention has the advantages that: by introducing a mobility management mechanism and aiming at the characteristics of sea area broadband information coverage, a user terminal needs to be switched between an offshore shore base station and a far-sea shipborne base station, and the aim of stably and quickly completing inter-network switching by the user terminal and effectively realizing seamless switching is fulfilled by utilizing a communication-in-motion antenna beam pointing control technology and a fuzzy switching control algorithm.
Description
Technical Field
The invention relates to the field of communication, in particular to a maritime user access switching method based on a communication-in-motion antenna.
Background
In the prior art, a sea area broadband communication network system is mainly composed of shore-based offshore coverage and ship networking enhanced coverage, and the design, test application and other works of a sea area broadband information network are developed according to the sea area broadband information coverage requirement. When a user terminal moves between networks, the user terminal needs to disconnect from one network, and then a new target network access is sought, and the network switching is in a core position in mobility management. However, since the user terminal and the shipborne base station both have mobility in the sea area broadband communication network system, the mobility makes the network topology change rapidly, and when performing network handover, phenomena such as handover delay, frequent handover, etc. are very likely to occur, and it is difficult to ensure the seamless requirement in the handover.
Disclosure of Invention
The technical problem to be solved by the invention is how to realize seamless switching of sea area broadband communication, and aiming at the technical problem to be solved, a method for switching the access of a sea user based on a communication-in-motion antenna is provided.
In order to achieve the purpose, the invention provides the following technical scheme: a method for switching access of a maritime user based on a communication-in-motion antenna comprises the following steps:
switching information acquisition, namely periodically acquiring base station information, user ship information and communication-in-motion antenna state information by a control mechanism;
switching decision, namely evaluating alternative base stations through a switching decision algorithm and selecting an optimal base station;
switching execution, wherein the communication-in-motion antenna executes switching action according to the result of the switching control strategy calculation;
the handover decision step comprises the steps of:
selecting parameters, namely selecting the parameters as parameters for decision processing, wherein the parameters comprise the movement speeds, the courses and the signal intensity changes of the ship-borne base stations and the user ships;
parameter processing, namely performing fuzzy normalization processing on speed and distance parameters of different shipborne base stations to obtain a delay parameter based on speed and distance;
and switching priority ranking, wherein the dynamic hysteresis parameters based on speed and distance fuzzy control obtained in the parameter processing step are ranked, and finally, the base station with the longest access duration is screened out to be used as a new access base station.
Further, the base station information includes shore-based base station information and surrounding shipborne base station information.
Further, the parameter processing step comprises a fuzzy logic system design process for the relative speed and distance parameters of the user ship and the shipborne base station.
Further, the fuzzy logic system design process comprises the steps of parameter fuzzification, rule base establishment and defuzzification.
Further, the parameter fuzzification process is based on two fuzzy input quantities of the relative speed and the distance between the user ship and the user ship, the control quantity required by the system is given, and the strategy calculation process is based on the assignment of a preset rule base.
Further, the defuzzification process is to convert the obtained fuzzy set into an accurate numerical value through an output membership function, and the accurate numerical value is used as an output quantity of the fuzzy logic control system.
Further, the handover execution strategy adopted in the handover execution step is to obtain information of the handover base station according to the handover strategy, calculate a steering angle of the mobile communication antenna by combining the angle of the current mobile communication antenna, and execute the handover.
Compared with the prior art, the invention has the beneficial effects that:
by introducing a mobility management mechanism and aiming at the characteristics of sea area broadband information coverage, a user terminal needs to be switched between an offshore shore base station and a far-sea shipborne base station, and the aim of stably and quickly completing inter-network switching by the user terminal and effectively realizing seamless switching is fulfilled by utilizing a communication-in-motion antenna beam pointing control technology and a fuzzy switching control algorithm.
Drawings
FIG. 1 is a schematic flow diagram of the process of the present invention;
fig. 2 is a schematic structural diagram of a mobile communication antenna used in an embodiment of the present invention;
fig. 3 is a diagram illustrating a process of controlling switching of a mobile communication antenna according to an embodiment of the present invention;
FIG. 4 is a table of rule base mappings in an embodiment of the present invention;
fig. 5 is a flow chart of a fuzzy switching algorithm in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 3, the present embodiment discloses a method for switching access to a maritime subscriber based on a mobile communication antenna, which includes the following steps:
switching information acquisition, namely periodically acquiring base station information, user ship information and communication-in-motion antenna state information by a control mechanism; specifically, the base station information includes shore-based base station information and surrounding shipborne base station information.
Switching decision, namely evaluating alternative base stations through a switching decision algorithm and selecting an optimal base station;
switching execution, wherein the communication-in-motion antenna executes switching action according to the result of the switching control strategy calculation;
the handover decision step comprises the steps of:
selecting parameters, namely selecting the parameters as parameters for decision processing, wherein the parameters comprise the movement speeds, the courses and the signal intensity changes of the ship-borne base stations and the user ships;
parameter processing, namely performing fuzzy normalization processing on speed and distance parameters of different shipborne base stations to obtain a delay parameter based on speed and distance;
and switching priority ranking, wherein the dynamic hysteresis parameters based on speed and distance fuzzy control obtained in the parameter processing step are ranked, and finally, the base station with the longest access duration is screened out to be used as a new access base station.
Possibly, the parameter processing step includes a fuzzy logic system design process for the relative speed and distance parameters of the user ship and the shipborne base station.
The fuzzy logic system design process comprises the steps of parameter fuzzification, rule base establishment and defuzzification. Specifically, the parameter fuzzification process is based on two fuzzy input quantities of the relative speed and the distance between the user ship and the user ship, the control quantity required by the system is given, and the strategy calculation process is based on the assignment of a preset rule base. The defuzzification process is to convert the obtained fuzzy set into an accurate numerical value through an output membership function, and the accurate numerical value is used as the output quantity of the fuzzy logic control system. The switching execution strategy adopted in the switching execution step is to obtain the information of the switching base station according to the switching strategy, calculate the steering angle of the communication-in-motion antenna by combining the angle of the current communication-in-motion antenna and execute the switching.
The method in the embodiment is applicable to sea communication scenarios. Since the user-installed mobile communication antenna has a directional characteristic and the base station ship and the user ship are in dynamic change, the accessed shore-based base station and the ship-borne base station need to be switched in the using process. In the method for switching access of the offshore user terminal based on the communication-in-motion antenna in the embodiment, the distance between the user ship and the shore-based base station is calculated in the offshore sea area range, and switching is performed between the shore-based base stations according to the course and the navigational speed of the user ship. When the shore-based base station can not meet the requirement of received signal strength, the navigational speed, the course and the distance of the ship-borne base station are used as access switching parameters, the switching hysteresis parameter of the alternative ship-borne base station is calculated, and the ship-borne base station which meets the switching judgment condition and has the longest access duration is selected as a new access point. Compared with the signaling switching method based on LTE-A3, the directional characteristic of the communication-in-motion antenna and the dynamic characteristic of the shipborne base station are fully considered, the switching times are reduced to the maximum extent and the switching delay is reduced while the basic communication connection is ensured, and stable communication service is provided for users.
The technology for communication in motion state is called "communication in motion" technology, and the core of the technology is stabilization technology and tracking technology. The stabilization technology is mainly used for isolating interference caused by carrier motion and keeping a controlled object (such as an antenna) stable relative to the inertial space orientation. In the tracking technology, after a controlled object is stabilized, the orientation of the controlled object is changed due to the drift of a stabilizing element, the slow movement of the position of the tracked object and the like, and a signal needs to be tracked in real time to correct the orientation. Compared with the traditional omnidirectional antenna, the communication-in-motion antenna not only meets the requirement of long-distance communication, but also has the characteristic of wide coverage range.
Preferably, the hardware of the mobile antenna used in this embodiment may be divided into an antenna and a feed network, a servo control system, a stable control computer, and a radio frequency rotary joint according to functions, and a detailed structure of the mobile antenna may be referred to fig. 2. The antenna adopts a grid antenna. Designing an antenna optimal lobe according to different types of AIS message updating rates: the horizontal lobe width is 13 degrees, the vertical lobe width is 19 degrees, remote accurate coverage can be achieved, and the method is suitable for the environment with high target density and high requirement on the use rate. The servo mechanism can support horizontal 360-degree rotation, and the stable control computer is combined with antenna control software to keep the antenna alignment angle.
After the antenna control software of the communication-in-motion system calculates the pointing angle required by the alignment base station, the stable control computer realizes the rapid and accurate adjustment of the antenna through the servo control system according to the calculation result, thereby ensuring the good communication effect. The radio frequency rotary joint realizes the continuous operation of the antenna and provides good prerequisite condition for realizing the dynamic beam function of the system.
The ship-borne communication-in-motion antenna can support the communication of a long-distance coast base station, can automatically select and access a large ship carrying a mobile base station network nearby, and has the characteristics of low power consumption, small volume, high automation degree and the like. The main functions are as follows: the system is communicated with a shore communication base station during sea navigation, and a tracking state is kept; the base station ship is communicated with the base station ship in the process of sea navigation, and the tracking state is kept.
The feasible 'communication-in-motion' antenna calculates the rotation direction and angle of the antenna through antenna control software, and realizes the collimation of the base station. When the ue is in a mobile state, it may pass through the coverage of different base stations, and it is necessary to always ensure the link quality of the ue. When the user ship leaves the offshore area and the shore-based base station can not meet communication access, the communication-in-motion antenna control software calculates the ship-based base stations which can be accessed at the periphery according to a switching strategy, and the switching from the shore-based base station to the ship-based base station is completed on the basis of avoiding irrelevant switching and reducing switching delay as much as possible. After entering the open sea area, when the received signal strength is smaller than a threshold value, switching is triggered, and the shipborne base station which has the longest link duration and meets the switching judgment is selected to be accessed.
The switching process can be divided into three stages of switching information acquisition, switching decision and switching execution. As shown in fig. 3, in the handover information collection phase, the control software periodically collects base station information (shore-based base stations and surrounding shipborne base stations), user ship information and traffic-in-motion antenna state information, so as to prepare necessary judgment parameters for handover judgment; in the switching decision stage, the alternative base stations are evaluated mainly by using a switching decision algorithm, and the optimal base station is selected; in the switching execution phase, the communication-in-motion antenna executes switching according to the result of the switching control strategy calculation.
The specific process of the switching decision stage is as follows:
this process decides when and where to switch based on the information gathered in the first stage. When to trigger handover refers to at which precise time point handover can be performed to achieve the best performance, and where to trigger handover refers to specifically selecting which base station to handover to meet the requirements of access users and the parameter requirements of handover.
And the feasible switching judgment comprises the processes of parameter selection, parameter processing, switching priority sequencing and the like. Specifically, the parameter selection refers to selecting appropriate parameters, including the moving speed, the heading direction, the signal strength change and the like of the shipborne base station and the user ship. The parameter processing stage is to perform fuzzy normalization processing on the speed and distance parameters of different shipborne base stations to obtain a delay parameter based on the speed and the distance. And a switching priority ranking stage, wherein the dynamic hysteresis parameters based on speed and distance fuzzy control obtained in the parameter processing stage are ranked, and finally, the base station with the longest access duration is screened out to be used as a new access base station. The parameter processing stage is characterized in that fuzzy logic system design is carried out on relative speed and distance parameters of a user ship and a shipborne base station, and the fuzzy logic system design is mainly divided into parameter fuzzification, rule base establishment and defuzzification.
Specifically, the fuzzification process may use a rule base defined in fig. 4 to calculate the current hysteresis factor value based on two fuzzy input quantities, i.e., the relative speed and distance between the user ship and the user ship. The rule base in the fuzzy logic control is obtained according to expert experience or practice. And the subsequent fuzzy logic reasoning refers to a fuzzy rule base, and gives the control quantity required by the system according to the obtained input quantity.
In the fuzzification process, each input quantity needs to be measured, and elements in the fuzzy sequence are assigned with values in the range of 0-1 according to the membership degree of each input linguistic variable corresponding to fuzzy sequence elements. Grades (NB, NS, ZO, PS and PB) corresponding to the calculated speed vInput factors of the membership functions of the relative speeds of the user ship and the base station ship respectively correspond to actual speeds of 5 nautical miles/h, 10 nautical miles/h, 15 nautical miles/h, 20 nautical miles/h and 25 nautical miles/h. The levels (NB, NS, ZO, PS, PB) corresponding to the distance input factors correspond to actual distances of 5km, 10km, 15km, 20km, 25km, respectively.
The rule base may be established by the user using the rule base as defined in fig. 4 to calculate the hysteresis factor value based on the fuzzy input of the relative speed and distance of the user's ship and the shipborne base station. The fuzzy logic reasoning refers to a fuzzy rule base, and gives the control quantity required by the system according to the obtained input quantity.
In addition, in the defuzzification process, the obtained fuzzy set is converted into an accurate numerical value through an output membership function, and the accurate numerical value is used as an output quantity of the fuzzy logic control system. As a membership function of the dynamic hysteresis parameter output, a gravity center method is used for performing defuzzification operation, and the formula is as follows:
where n is the number of all rules, xiAs a blurring factor, H (x)i) Is an output membership function of the dynamic hysteresis parameter.
The mobile communication antenna obtains information of the base station to be switched according to the switching strategy, and calculates the steering angle of the mobile communication antenna by combining the angle of the current mobile communication antenna, so as to execute the switching.
Mobility refers to the ability of a user to continue using a communication service while the user is moving, which is mainly achieved through base station handover. Mobility makes communication and service access for user terminals unaffected by location changes, i.e. service independent of location.
In this embodiment, the antenna switching process can be performed according to the following process, the switching process is as shown in fig. 5. in order to obtain the accuracy and smoothness of the switching and lower switching delay, in this embodiment, a fuzzy switching algorithm strategy based on the factors such as signal strength, course, speed and distance is introduced based on the speed and distance of the user ship and the base station ship through the assistance of GPS information, the switching algorithm based on the signal strength of the base station, the speed, distance and course of the user ship and the base station ship has two meanings, ① introduces fuzzy logic control based on the relative speed and distance of the user ship and the base station ship, dynamically adjusts the hysteresis factor, improves the switching success rate, ② evaluates the movement trend of the user ship according to the relative direction of the user ship and the base station ship, calculates the effective link duration of the current base station and the alternative switching base station, more accurately judges whether the user ship needs to be switched at this time, saves the delay triggering time in the conventional switching algorithm, reduces the switching delay, and can avoid unnecessary switching, and reduce the switching times reasonably, and the switching process is as shown in fig. 5.
The specific handover procedure steps may be to use the RSS value as the handover hysteresis parameter and trigger the handover algorithm. I.e. when equation (1) is satisfied, a handover decision is triggered.
RSSBSi＞RSSorigin+Hystv,L(1)
Wherein the RSSBSiReceived signal strength, RSS, of a base station for its purposeoriginFor the current base station signal reception strength, Hystv,LIs a dynamic value based on the velocity v and the distance L.
When the user ship is still within the coverage range of the shore-based base station in the offshore sea area during the process that the user ship drives from the offshore area to the far sea, the shore-based base station can meet the communication requirement, and the user ship preferentially selects to communicate with the shore-based base station. In the embodiment, a distance threshold value Dthreshold for distinguishing offshore areas from open sea areas is set, and when the distance from the coast of the user ship is greater than the threshold value, the user ship selects the shipborne base station with the optimal performance from the N shipborne base stations to access.
The algorithm comprises the following specific steps:
1) judging whether the access base station of the user ship at the moment is a shore-based base station, if so, turning to 2), and if not, turning to 5);
2) calculating the distance D between the user ship and the coast at the momentue-bslIf D isue-bsl<DthresholdWhen the signal strength of the shore-based base station can meet the communication requirement, turning to 3), otherwise, turning to 5);
3) scanning wireless signals around a user ship, judging the maximum intensity of the signals by a terminal, identifying the source of the signals, keeping the current base station to be accessed if the current accessed base station is still the shore base station with the maximum signal intensity, and turning to 2), otherwise, selecting the shore base station BS with the maximum signal intensity from the M-1 shore base stationsl,iAccessing, turning to 4);
4) analyzing the motion condition of the user ship through the VDO message of the shipborne AIS system, calculating the rotation angle of the antenna by combining the position coordinate information of the shore-based base station and the direction information (given by the servo system) of the communication-in-motion antenna of the user ship, controlling the antenna servo system, and enabling the communication-in-motion antenna to turn to the shore-based base station BSl,iAccessing a new shore-based base station, and turning to 2);
5) if the user terminal measures that the received signal strength of the current base station is lower than a set THRESHOLD value RSS _ THRESHOLD, the UE sends a measurement report of an event to the base station, and then the step 6) is carried out, and if not, the step 12) is carried out;
6) after the reporting of the measurement report is triggered, if the measurement report meets the triggering condition of switching, extracting information such as an identification code (namely an MMSI code) of a corresponding ship from a database according to the signal identification information of each shipborne base station, and turning to 7);
7) receiving and resolving AIS static information of ship broadcast of each ship-borne base station through MMSI codes, acquiring the installation position of each ship-borne base station antenna, and turning to 8);
8) receiving and resolving AIS dynamic information broadcasted by ships where the shipborne base stations are located through MMSI codes, acquiring position information (namely longitude and latitude) and navigation state information (namely speed to ground, course to ground, true course, steering rate and the like) of each ship, and turning to 9);
9) obtaining dynamic Hyst based on fuzzy logic control according to the relative speed and distance between the user ship and the N shipborne base stationsv,LValue at N shipborne base stations BSi(i-1, 2, …, N) to satisfy the formula RSSBSi＞RSScurrent+Hystv,LThe shipborne base station of (1). If it satisfiesDetermining whether the movement trend of the user ship is close to the target base station and far away from the current original service base station according to the heading of the user ship, namely meeting psi>90°，θ<90 degrees (psi represents the angle between the straight line direction from the user ship to the current base station and the speed of the user ship, and theta represents the angle between the straight line direction from the user ship to the target base station and the speed of the user ship), thereby avoiding unnecessary switching and reducing the switching times. If yes, go to step 10);
10) judging the duration of the access base station according to the relative course and speed, arranging according to the time priority, selecting the shipborne base station with the longest access duration, and marking the base station as maxT (BS)i). Obtaining the information of the switching base station according to the calculation result, calculating the switching trigger time T, sending a switching command, and turning to 11);
11) calculating the rotation angle of the satellite communication-in-motion antenna according to the information obtained in the step 7) and the step 8), transmitting the rotation angle to a stable control computer, controlling a servo system by the stable control computer, rotating the antenna to a specified position, and enabling the satellite communication-in-motion antenna to point to a shipborne base station BSiTurn 12);
12) checking the communication quality, and determining the optimal communication direction by rotating the angle to the left and the right to adjust the angle, so that the mobile communication antenna always points to the position with the maximum signal intensity, and turning 5).
Compared with a transmission switching method, the switching process has the characteristics of good communication quality and low switching delay. The conventional handover decision method is to perform handover based on the received signal strength RSS value, and perform handover when the signal strength value of the shore-based base station received by the mobile terminal is smaller than a fixed threshold. The single-factor switching decision algorithm has the disadvantages that a serious ping-pong effect is generated, unnecessary switching times are excessive, switching delay is increased, congestion is caused to a network channel, and communication quality is influenced.
The system adopting the method of the invention can be set by adopting the following functional structure, which can comprise a switching information acquisition module used for acquiring base station information, user GPS information and antenna direction information; the switching decision strategy module is used for introducing an RSS early warning threshold, carrying out fuzzy normalization processing on parameters such as signal strength, speed and distance, and extracting the parameters by a fuzzy logic switching algorithm to obtain a switching strategy; and the switching execution module is used for calculating the steering angle of the communication-in-motion antenna according to the result obtained by the switching strategy and the angle of the current antenna, and executing the switching strategy.
Under the network architecture combining offshore shore-based coverage and open-sea ship networking enhanced coverage, the invention utilizes the communication-in-motion antenna, the beam pointing control technology and the fuzzy switching technology to ensure that the user terminal stably and quickly completes network switching, thereby having wide application prospect. Compared with the prior art, compared with the traditional switching decision algorithm, the switching power is higher under the same environment. The switching success rate of the traditional switching judgment algorithm is greatly influenced by the speed, the switching success rate is better in performance at a medium speed, but the switching success rate is obviously reduced under the condition of low-speed or high-speed running. The switching judgment algorithm based on signal strength, speed and distance has no obvious change of the switching success rate along with the speed change. The algorithm introduces a fuzzy control algorithm based on the speed, dynamically adjusts the hysteresis parameter and adapts to different speed scenes.
Good switching stability. The traditional switching times show a trend of reducing along with the change of the speed, for a high-speed user, the hysteresis parameter is too large, the switching is difficult to trigger, and the switching success rate is reduced while the switching times are reduced. The algorithm proposed herein maintains good stability over the number of switches under speed variations. Compared with the traditional algorithm, the algorithm provided by the invention introduces the RSS early warning threshold, and assists in judgment according to the course, so that unnecessary switching is avoided as much as possible. The hysteresis parameter is dynamically adjusted based on the speed and the distance, so that a lower ping-pong switching event is maintained when the user terminal runs at a medium-low speed; in the process of high-speed driving, the high switching success rate is kept, and the requirement of a user on handover is met.
The method can dynamically adjust the hysteresis factor based on the speed and the distance of the user ship through the assistance of GPS information, introduces a new judgment basis for triggering a switching request by combining the signal receiving strength, and reduces the ping-pong effect as much as possible on the premise of improving the switching success rate; and the motion trend of the user ship and the shipborne base station is more accurately evaluated according to the motion directions of the user ship and the shipborne base station, so that the times of wrong switching are avoided, and the time of switching judgment is reduced.
Compared with an omnidirectional antenna, the mobile communication antenna has the characteristic of long-distance communication, can realize accurate aiming by adjusting the direction of the antenna under the condition of accessing the same base station, can effectively prolong the link access time and reduce the switching frequency.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.
Claims (7)
1. A method for switching access of a maritime user based on a communication-in-motion antenna is characterized by comprising the following steps:
switching information acquisition, namely periodically acquiring base station information, user ship information and communication-in-motion antenna state information by a control mechanism;
switching decision, namely evaluating alternative base stations through a switching decision algorithm and selecting an optimal base station;
switching execution, wherein the communication-in-motion antenna executes switching action according to the result of the switching control strategy calculation;
the handover decision step comprises the steps of:
selecting parameters, namely selecting the parameters as parameters for decision processing, wherein the parameters comprise the movement speeds, the courses and the signal intensity changes of the ship-borne base stations and the user ships;
parameter processing, namely performing fuzzy normalization processing on speed and distance parameters of different shipborne base stations to obtain a delay parameter based on speed and distance;
and switching priority ranking, wherein the dynamic hysteresis parameters based on speed and distance fuzzy control obtained in the parameter processing step are ranked, and finally, the base station with the longest access duration is screened out to be used as a new access base station.
2. The method as claimed in claim 1, wherein the base station information includes shore-based base station information and surrounding shipborne base station information.
3. The method according to claim 1, wherein the parameter processing step comprises a fuzzy logic system design process for the relative speed and distance parameters between the user ship and the shipborne base station.
4. The method as claimed in claim 3, wherein the fuzzy logic system design process comprises the steps of parameter fuzzification, rule base establishment and defuzzification.
5. The method as claimed in claim 5, wherein the parameter fuzzification process is based on two fuzzy input quantities of relative speed and distance between the user ship and the user ship to give a control quantity required by the system, and the policy calculation process is based on the assignment of a preset rule base.
6. The method as claimed in claim 5, wherein the defuzzification process is to convert the fuzzy set into an accurate value as the output of the fuzzy logic control system through the output membership function.
7. The maritime user access switching method based on the communication-in-motion antenna as claimed in claim 1, wherein the switching implementation strategy adopted in the switching implementation step is to obtain information of a switching base station according to the switching strategy, and to implement switching by calculating a steering angle of the communication-in-motion antenna in combination with an angle of the current communication-in-motion antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010039129.9A CN111148172A (en) | 2020-01-14 | 2020-01-14 | Mobile communication antenna-based maritime user access switching method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010039129.9A CN111148172A (en) | 2020-01-14 | 2020-01-14 | Mobile communication antenna-based maritime user access switching method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111148172A true CN111148172A (en) | 2020-05-12 |
Family
ID=70525177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010039129.9A Pending CN111148172A (en) | 2020-01-14 | 2020-01-14 | Mobile communication antenna-based maritime user access switching method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111148172A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113207154A (en) * | 2021-04-30 | 2021-08-03 | 上海海事大学 | Method for switching multi-shore-based base station of ocean internet and establishing communication between multi-shore-based base station and mobile ship |
| WO2022028296A1 (en) * | 2020-08-07 | 2022-02-10 | 大唐移动通信设备有限公司 | Communication method and apparatus, and device |
| CN114745758A (en) * | 2022-05-07 | 2022-07-12 | 广州海事科技有限公司 | Multi-base station fusion communication method, system, computer equipment and storage medium |
| CN114760674A (en) * | 2021-01-14 | 2022-07-15 | 南通大学 | Shipborne private network CPE design and communication method based on shipborne communication-in-motion antenna |
| CN114885341A (en) * | 2022-05-08 | 2022-08-09 | 南通市大数据发展集团有限公司 | Protection optimization system based on airport site |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106792755A (en) * | 2016-12-30 | 2017-05-31 | 清华大学 | A kind of overocean communications system and the switchgear distribution method of boat-carrying mobile base station |
| CN107249200A (en) * | 2017-05-10 | 2017-10-13 | 西安交通大学 | A kind of switching method of application Fuzzy Forecasting Model |
| CN107454571A (en) * | 2017-07-20 | 2017-12-08 | 清华大学 | A kind of coastal waters user's access switching method towards broadband experience |
| CN109860982A (en) * | 2018-12-17 | 2019-06-07 | 南通先进通信技术研究院有限公司 | A kind of antenna for satellite communication in motion and its sea area broadband access system |
-
2020
- 2020-01-14 CN CN202010039129.9A patent/CN111148172A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106792755A (en) * | 2016-12-30 | 2017-05-31 | 清华大学 | A kind of overocean communications system and the switchgear distribution method of boat-carrying mobile base station |
| CN107249200A (en) * | 2017-05-10 | 2017-10-13 | 西安交通大学 | A kind of switching method of application Fuzzy Forecasting Model |
| CN107454571A (en) * | 2017-07-20 | 2017-12-08 | 清华大学 | A kind of coastal waters user's access switching method towards broadband experience |
| CN109860982A (en) * | 2018-12-17 | 2019-06-07 | 南通先进通信技术研究院有限公司 | A kind of antenna for satellite communication in motion and its sea area broadband access system |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022028296A1 (en) * | 2020-08-07 | 2022-02-10 | 大唐移动通信设备有限公司 | Communication method and apparatus, and device |
| CN114071616A (en) * | 2020-08-07 | 2022-02-18 | 大唐移动通信设备有限公司 | Communication method, device and equipment |
| CN114760674A (en) * | 2021-01-14 | 2022-07-15 | 南通大学 | Shipborne private network CPE design and communication method based on shipborne communication-in-motion antenna |
| CN113207154A (en) * | 2021-04-30 | 2021-08-03 | 上海海事大学 | Method for switching multi-shore-based base station of ocean internet and establishing communication between multi-shore-based base station and mobile ship |
| CN113207154B (en) * | 2021-04-30 | 2023-07-25 | 上海海事大学 | Multi-shore base station switching of ocean Internet and method for establishing communication with mobile ship |
| CN114745758A (en) * | 2022-05-07 | 2022-07-12 | 广州海事科技有限公司 | Multi-base station fusion communication method, system, computer equipment and storage medium |
| CN114885341A (en) * | 2022-05-08 | 2022-08-09 | 南通市大数据发展集团有限公司 | Protection optimization system based on airport site |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111148172A (en) | Mobile communication antenna-based maritime user access switching method | |
| AU756485B2 (en) | Improved CDMA soft hand-off | |
| US9026114B2 (en) | System and method for geographically locating a cellular phone | |
| US11357078B1 (en) | Communication system and method for high-speed low-latency wireless connectivity in mobility application | |
| CN105357725A (en) | Method for reducing satellite communication system switching delay | |
| CN113259999B (en) | Method and device for configuring network resources | |
| US11737169B2 (en) | Communication system and method for high-reliability low-latency wireless connectivity in mobility application | |
| US20220190941A1 (en) | Terminal and communication system | |
| CN103476080A (en) | Self-adaption vertical handoff method based on residence time | |
| Wu et al. | Reducing handoff delay of wireless access in vehicular environments by artificial neural network-based geographical fingerprint | |
| Rahman et al. | Traveling distance estimation to mitigate unnecessary handoff in mobile wireless networks | |
| Almulla et al. | A fast location-based handoff scheme for vehicular networks | |
| Mäkelä | Effects of handoff algorithms on the performance of multimedia wireless networks | |
| CN114430293B (en) | Adaptive beam switching method and system for GEO satellite communication | |
| Aljeri | Efficient ai and prediction techniques for smart 5G-enabled vehicular networks | |
| CN113993099B (en) | Three-dimensional space-oriented mobile unmanned aerial vehicle user switching parameter configuration method | |
| US20240022308A1 (en) | Selecting One or More Beams for Communication and/or Measurement, or Determining Motion of a Wireless Device | |
| Bi et al. | Research on joint handoff algorithm in vehicles networks | |
| Kang et al. | A new quasi periodic triggering mechanism of handover under a high speed mobile environment | |
| Kang et al. | A new trigger mechanism of handover based on the regular mobile route and the handover invitation | |
| Porretta et al. | Estimating position and velocity of mobile terminals in a microcellular network using an adaptive linear regression setup | |
| CN112996071A (en) | Vehicle vertical switching method and system based on user service perception | |
| Arslan et al. | Location Information Management Systems for Cognitive Wireless Networks | |
| Wang | Design of a Fast Location-Based Handoff Scheme for Vehicular Networks | |
| Kim et al. | A Noble Fuzzy-based Mobile Tracking Scheme. |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200512 |