CN106412984B - Method and system for realizing optimal neighbor prediction of mobile terminal - Google Patents
Method and system for realizing optimal neighbor prediction of mobile terminal Download PDFInfo
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- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
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- H—ELECTRICITY
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Abstract
The invention discloses a method and a system for realizing optimal neighbor prediction of a mobile terminal, wherein the method comprises the following steps: acquiring the current moving speed of the mobile terminal and judging whether the current moving speed is greater than a preset first speed threshold value or not; if the current moving speed is greater than a first speed threshold, base stations with the distance from the mobile terminal being smaller than a preset distance threshold are obtained, and included angles between a connection line of the mobile terminal and each base station and a direction line where the mobile terminal moves and signal intensity of each base station are obtained; and acquiring the base station of which the signal intensity is greater than a first signal intensity threshold value and the included angle between the connection line of the mobile terminal and the base station and the direction line of the motion of the mobile terminal is the minimum value of the included angles, and reporting the connection request of the mobile terminal to the base station. The invention realizes that the next best adjacent cell is predicted and reported to the corresponding base station in high-speed motion, thereby ensuring that the base station can provide longer service time after switching so as to reduce ping-pong switching and disordered invalid switching.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a method and a system for realizing optimal neighbor prediction of a mobile terminal.
Background
The popularization of the high-speed railway greatly facilitates the travel of people. However, as the speed of a high-speed train is continuously increased, people find that the quality of mobile phone calls in the high-speed train is also continuously reduced, and particularly when the speed exceeds 200 km/h, the problems of network disconnection, call noise, low internet speed and the like often occur. One of the main reasons is frequent handover, ping-pong handover and invalid handover of the serving cell caused by high-speed movement of the mobile phone. The problems can be improved by optimizing network coverage, such as building a high-speed rail private network, and meanwhile, the mobile terminal needs to be optimized, and especially, when the network coverage is not completely optimized, the optimization of the mobile terminal is more important.
The existing mobile terminal generally only measures signals of a serving cell and a neighboring cell and reports the signals to a base station, and the base station determines whether to perform switching and how to perform switching. The existing mobile terminal generally cannot predict the next best serving cell according to the motion state of the mobile terminal.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
In view of the above-mentioned deficiencies of the prior art, an object of the present invention is to provide a method and a system for implementing an optimal neighbor cell prediction of a mobile terminal, which are used to solve the problem that the mobile terminal cannot predict a next optimal serving cell according to its own motion state in the prior art.
The technical scheme of the invention is as follows:
a method for realizing optimal neighbor prediction of a mobile terminal comprises the following steps:
A. acquiring the current moving speed of the mobile terminal, and judging whether the current moving speed is greater than a preset first speed threshold value;
B. if the current moving speed is greater than the first speed threshold, acquiring base stations of which the distance from the mobile terminal is smaller than a preset distance threshold, and acquiring included angles between a connection line of the mobile terminal and each base station and a direction line in which the mobile terminal moves and signal intensity of each base station;
C. and acquiring the base station of which the signal intensity is greater than the first signal intensity threshold value and the included angle between the connection line of the mobile terminal and the base station and the direction line of the motion of the mobile terminal is the minimum value of the included angles, and reporting the connection request of the mobile terminal to the base station.
The method for realizing the optimal neighbor prediction of the mobile terminal, wherein the step B specifically comprises:
b1, if the current moving speed is larger than the first speed threshold value, judging whether the GPS signal of the mobile terminal is available;
b2, when the GPS signal of the mobile terminal is available, obtaining a base station whose distance from the mobile terminal is smaller than a preset distance threshold, and obtaining an included angle between a connection line of the mobile terminal and each base station and a direction line in which the mobile terminal moves, and a signal intensity of each base station according to θ = arccos (fd × c)/(f × v); the method comprises the following steps that theta is an included angle between a connecting line of a mobile terminal and a base station and a direction line where the mobile terminal moves, fd is the Doppler frequency shift between the mobile terminal and the base station, c is the propagation speed of electromagnetic waves, f is the current downlink working frequency of the base station, and v is the current moving speed of the mobile terminal.
The method for implementing the optimal neighbor prediction of the mobile terminal, wherein the step B2 is followed by further comprising:
b3, when the GPS signal of the mobile terminal is not available, acquiring the base station signal change slope of each base station relative to the mobile terminal, and acquiring the base station with the base station signal change slope being greater than or equal to 0.
The method for realizing the optimal neighbor prediction of the mobile terminal, wherein the step C specifically includes:
c1, when the GPS signal of the mobile terminal is available, judging whether a base station exists, wherein the signal intensity of the base station is greater than the first signal intensity threshold value, and the included angle between the connection line of the mobile terminal and the base station and the direction line of the mobile terminal movement is the minimum value of the plurality of included angles;
c2, if there is a base station whose signal strength is greater than the first signal strength threshold value and the included angle between the connection line of the mobile terminal and the base station and the direction line of the mobile terminal motion is the minimum value of the included angles, reporting the connection request of the mobile terminal to the base station;
c3, if there is a base station whose signal strength is smaller than the first signal strength threshold and larger than a preset second signal strength threshold, whose current moving speed is larger than a preset second speed threshold, and whose included angle between the connection line of the mobile terminal and the base station and the direction line of the mobile terminal movement is the minimum value of the multiple included angles, reporting the connection request of the mobile terminal to the base station; wherein the second signal strength threshold is less than the first signal strength threshold, and the second speed threshold is greater than the first speed threshold.
The method for realizing the prediction of the optimal neighbor cell of the mobile terminal, wherein the step C further comprises the following steps:
and C4, when the GPS signal of the mobile terminal is unavailable, acquiring the base station of which the signal intensity is greater than the first signal intensity threshold value, the included angle between the connecting line of the mobile terminal and the base station and the direction line of the motion of the mobile terminal is less than 90 degrees and the signal intensity of the base station is the maximum value, and reporting the connection request of the mobile terminal to the base station.
An implementation system for optimal neighbor prediction of a mobile terminal, wherein the system comprises:
the speed acquisition and judgment module is used for acquiring the current moving speed of the mobile terminal and judging whether the current moving speed is greater than a preset first speed threshold value or not;
an included angle and signal strength acquisition module, configured to, if the current moving speed is greater than the first speed threshold, acquire a base station whose distance from the mobile terminal is less than a preset distance threshold, and acquire an included angle between a connection line between the mobile terminal and each base station and a direction line in which the mobile terminal moves, and a signal strength of each base station;
and the reporting interconnection module is used for acquiring the base station of which the signal intensity is greater than the first signal intensity threshold value and the included angle between the connection line of the mobile terminal and the base station and the direction line of the motion of the mobile terminal is the minimum value of the included angles, and reporting the connection request of the mobile terminal to the base station.
The system for realizing the best neighbor prediction of the mobile terminal comprises the following modules:
the first judging unit is used for judging whether a GPS signal of the mobile terminal is available or not when the current moving speed is greater than the first speed threshold;
an included angle obtaining unit, configured to obtain, when a GPS signal of the mobile terminal is available, base stations whose distance from the mobile terminal is smaller than a preset distance threshold, and obtain, according to θ = arccos (fd × c)/(f × v), included angles between a connection line between the mobile terminal and each base station and a direction line in which the mobile terminal moves, and a signal intensity of each base station; the method comprises the following steps that theta is an included angle between a connecting line of a mobile terminal and a base station and a direction line where the mobile terminal moves, fd is the Doppler frequency shift between the mobile terminal and the base station, c is the propagation speed of electromagnetic waves, f is the current downlink working frequency of the base station, and v is the current moving speed of the mobile terminal.
The system for realizing the best neighbor prediction of the mobile terminal, wherein the module for acquiring the included angle and the signal strength further comprises:
and the base station information acquisition unit is used for acquiring the base station signal change slope of each base station relative to the mobile terminal when the GPS signal of the mobile terminal is unavailable, and acquiring the base station with the base station signal change slope being more than or equal to 0.
The system for realizing the best neighbor prediction of the mobile terminal, wherein the reporting interconnection module specifically comprises:
a second judging unit, configured to judge whether there is a base station in which the signal strength of the base station is greater than the first signal strength threshold and an included angle between a connection line between the mobile terminal and the base station and a direction line in which the mobile terminal moves is a minimum value among the multiple included angles when a GPS signal of the mobile terminal is available;
the first interconnection unit is used for reporting a connection request of the mobile terminal to the base station if the base station exists, the signal intensity of the base station is greater than the first signal intensity threshold value, and the included angle between the connection line of the mobile terminal and the base station and the direction line of the motion of the mobile terminal is the minimum value of the included angles;
the second interconnection unit is used for reporting the connection request of the mobile terminal to the base station if the base station has the signal intensity smaller than the first signal intensity threshold value and larger than a preset second signal intensity threshold value, the current moving speed of the mobile terminal is larger than a preset second speed threshold value, and the included angle between the connection line of the mobile terminal and the base station and the direction line of the movement of the mobile terminal is the minimum value of a plurality of included angles; wherein the second signal strength threshold is less than the first signal strength threshold, and the second speed threshold is greater than the first speed threshold.
The system for realizing the best neighbor prediction of the mobile terminal, wherein the reporting interconnection module further comprises:
and the third interconnection unit is used for acquiring the base station of which the signal intensity is greater than the first signal intensity threshold value, the included angle between the connecting line of the mobile terminal and the base station and the direction line of the movement of the mobile terminal is less than 90 degrees and the signal intensity of the base station is the maximum value when the GPS signal of the mobile terminal is unavailable, and reporting the connection request of the mobile terminal to the base station.
The invention provides a method and a system for realizing the best neighbor prediction of a mobile terminal, wherein the method comprises the following steps: acquiring the current moving speed of the mobile terminal, and judging whether the current moving speed is greater than a preset first speed threshold value; if the current moving speed is greater than the first speed threshold, acquiring base stations of which the distance from the mobile terminal is smaller than a preset distance threshold, and acquiring included angles between a connection line of the mobile terminal and each base station and a direction line in which the mobile terminal moves and signal intensity of each base station; and acquiring the base station of which the signal intensity is greater than the first signal intensity threshold value and the included angle between the connection line of the mobile terminal and the base station and the direction line of the motion of the mobile terminal is the minimum value of the included angles, and reporting the connection request of the mobile terminal to the base station. The invention realizes that the next best adjacent cell is intelligently predicted in the process of high-speed movement of the mobile terminal, and only the measurement result of the best adjacent cell is reported to the corresponding base station, thereby ensuring that the base station can provide longer service time after switching, and reducing ping-pong switching of front and back cells and disordered invalid switching of lateral cells.
Drawings
Fig. 1 is a flowchart of a method for implementing optimal neighbor prediction of a mobile terminal according to a preferred embodiment of the present invention.
Fig. 2 is a diagram of a typical base station cell and its signal distribution along a railway.
Fig. 3 is a block diagram of a preferred embodiment of a system for implementing optimal neighbor prediction of a mobile terminal according to the present invention.
Detailed Description
The invention provides a method and a system for realizing the prediction of the best adjacent cell of a mobile terminal, and the invention is further explained in detail below in order to make the purpose, the technical scheme and the effect of the invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, a flowchart of a preferred embodiment of the method for implementing optimal neighbor prediction of a mobile terminal according to the present invention is shown, where the method includes the following steps:
step S100, acquiring the current moving speed of the mobile terminal, and judging whether the current moving speed is greater than a preset first speed threshold value;
step S200, if the current moving speed is greater than the first speed threshold, acquiring base stations of which the distance from the mobile terminal is smaller than a preset distance threshold, and acquiring included angles between a connecting line of the mobile terminal and each base station and a direction line in which the mobile terminal moves and signal intensity of each base station;
step S300, a base station is obtained, wherein the signal intensity of the base station is greater than the first signal intensity threshold value, and the included angle between the connection line of the mobile terminal and the base station and the direction line of the mobile terminal motion is the minimum value of the included angles, and the connection request of the mobile terminal is reported to the base station.
Fig. 2 is a schematic diagram of a base station cell along a typical railway and signal distribution thereof, wherein Ø is an angle between a terminal operation direction and the base station cell (Ø 1 is an angle between a connection line between a mobile terminal and the base station 1 and a direction line in which the mobile terminal moves, Ø 2 is an angle between a connection line between the mobile terminal and the base station 2 and a direction line in which the mobile terminal moves, Ø 3 is an angle between a connection line between the mobile terminal and the base station 3 and a direction line in which the mobile terminal moves, Ø 4 is an angle between a connection line between the mobile terminal and the base station 4 and a direction line in which the mobile terminal moves),. Ø is greater than 90 degrees, which indicates that the mobile terminal is far from the base station and the base station can provide a short amount of remaining service time, Ø is less than 90 degrees, which indicates that the mobile terminal is approaching the base station and the base station can provide a long and wide service range as Ø indicates that the operation path of the terminal approaches the base station cell.
When a serving cell of a base station initiates handover, an existing mobile terminal generally switches to a neighboring cell with the strongest signal strength without considering whether the base station can provide a longer service time. In the embodiment of the invention, the signal intensity of the adjacent cell and the service time which can be provided are comprehensively considered to screen out the optimal adjacent cell, only the measurement result of the optimal adjacent cell is reported to the corresponding base station, when the service cell of the base station initiates switching, the mobile terminal can only be switched to the optimal adjacent cell, the target cell can provide longer service time after switching, and the switching times are reduced.
Preferably, the step S200 specifically includes:
step S201, if the current moving speed is larger than the first speed threshold value, judging whether a GPS signal of the mobile terminal is available;
step S202, when the GPS signal of the mobile terminal is available, acquiring base stations of which the distance from the mobile terminal is smaller than a preset distance threshold, and acquiring included angles between a connecting line of the mobile terminal and each base station and a direction line where the mobile terminal moves and signal intensity of each base station according to theta = arccos (fd × c)/(f × v); the method comprises the following steps that theta is an included angle between a connecting line of a mobile terminal and a base station and a direction line where the mobile terminal moves, fd is the Doppler frequency shift between the mobile terminal and the base station, c is the propagation speed of electromagnetic waves, f is the current downlink working frequency of the base station, and v is the current moving speed of the mobile terminal.
The doppler shift formula is fd = (f × v × cos θ)/c, where fd is the doppler shift between the mobile terminal and the base station, c is the propagation speed of electromagnetic waves, f is the current downlink operating frequency of the base station, v is the current moving speed of the mobile terminal, and θ is the included angle between the connection line between the mobile terminal and the base station and the direction line where the mobile terminal moves. Therefore, θ = arccos (fd × c)/(f × v) can be derived according to the doppler shift formula, and the included angles between the connection line of the mobile terminal and each base station and the direction line of the mobile terminal motion can be obtained according to θ = arccos (fd × c)/(f × v). When the current downlink working frequency f and the electromagnetic wave propagation speed c of the base station are known, the included angle theta between the connection line of the mobile terminal and the base station and the direction line of the motion of the mobile terminal can be calculated as long as the Doppler frequency shift fd and the current moving speed v of the mobile terminal are measured.
Further, after the step S202, the method further includes:
step S203, when the GPS signal of the mobile terminal is not available, acquiring a base station signal change slope of each base station relative to the mobile terminal, and acquiring a base station with a base station signal change slope greater than or equal to 0.
When the GPS signal is not available, estimating whether the included angle Ø between the mobile terminal running direction and the base station (Ø and theta represent the same parameters) is larger than 90 degrees or smaller than 90 degrees by measuring the change trend of the base station signal, wherein the change slope of the base station signal is a positive value and represents that the included angle Ø between the mobile terminal running direction and the base station is smaller than 90 degrees, and the change slope of the base station signal is a negative value and represents that the included angle Ø between the mobile terminal running direction and the base station cell is larger than 90 degrees.
Preferably, the step S300 specifically includes:
step S301, when the GPS signal of the mobile terminal is available, judging whether a base station exists, wherein the signal intensity of the base station is greater than the first signal intensity threshold value, and the included angle between the connection line of the mobile terminal and the base station and the direction line of the mobile terminal movement is the minimum value of a plurality of included angles;
step S302, if there is a base station with the signal intensity of the base station being greater than the first signal intensity threshold value and the included angle between the connection line of the mobile terminal and the base station and the direction line of the mobile terminal movement being the minimum value of the included angles, reporting the connection request of the mobile terminal to the base station;
step S303, if there is a base station whose signal strength is smaller than the first signal strength threshold and larger than a preset second signal strength threshold, whose current moving speed is larger than a preset second speed threshold, and whose included angle between the connection line of the mobile terminal and the base station and the direction line of the mobile terminal movement is the minimum value of a plurality of included angles, reporting the connection request of the mobile terminal to the base station; wherein the second signal strength threshold is less than the first signal strength threshold, and the second speed threshold is greater than the first speed threshold.
In a specific implementation, the first speed threshold may be set to 200 km/h, and the second speed threshold may be set to 300 km/h.
Step S303 is a high-speed weak signal camping mechanism, where the mobile terminal selects a neighbor cell whose signal strength is greater than the second signal strength threshold but less than the first signal strength threshold and whose included angle is Ø is the smallest as a potential best neighbor cell, and reports the measurement result of the potential best neighbor cell to the current base station, otherwise, reports the measurement result without performing best neighbor cell prediction according to the existing rules.
Preferably, the step S300 further includes:
step S304, when the GPS signal of the mobile terminal is unavailable, acquiring the base station of which the signal intensity is greater than the first signal intensity threshold value, the included angle between the connecting line of the mobile terminal and the base station and the direction line of the movement of the mobile terminal is less than 90 degrees and the signal intensity of the base station is the maximum value, and reporting the connection request of the mobile terminal to the base station.
Therefore, the invention realizes that the next best adjacent cell is intelligently predicted in the process of high-speed movement of the mobile terminal, and only the measurement result of the best adjacent cell is reported to the corresponding base station, so that the base station can provide longer service time after switching, and ping-pong switching of the front cell and the back cell and disordered invalid switching of the lateral cell are reduced.
Based on the embodiment of the method, the invention also provides a system for realizing the optimal neighbor prediction of the mobile terminal. As shown in fig. 3, the system for implementing optimal neighbor prediction of a mobile terminal includes:
a speed obtaining and judging module 100, configured to obtain a current moving speed of the mobile terminal, and judge whether the current moving speed is greater than a preset first speed threshold;
an included angle and signal strength obtaining module 200, configured to, if the current moving speed is greater than the first speed threshold, obtain base stations whose distance from the mobile terminal is less than a preset distance threshold, and obtain an included angle between a connection line between the mobile terminal and each base station and a direction line in which the mobile terminal moves, and a signal strength of each base station;
and a reporting interconnection module 300, configured to acquire a base station for which the signal strength of the base station is greater than the first signal strength threshold, and an included angle between a connection line between the mobile terminal and the base station and a direction line in which the mobile terminal moves is the minimum value among the multiple included angles, and report a connection request of the mobile terminal to the base station.
Preferably, in the system for implementing optimal neighbor prediction of a mobile terminal, the module 200 for acquiring an included angle and a signal strength specifically includes:
the first judging unit is used for judging whether a GPS signal of the mobile terminal is available or not when the current moving speed is greater than the first speed threshold;
an included angle obtaining unit, configured to obtain, when a GPS signal of the mobile terminal is available, base stations whose distance from the mobile terminal is smaller than a preset distance threshold, and obtain, according to θ = arccos (fd × c)/(f × v), included angles between a connection line between the mobile terminal and each base station and a direction line in which the mobile terminal moves, and a signal intensity of each base station; the method comprises the following steps that theta is an included angle between a connecting line of a mobile terminal and a base station and a direction line where the mobile terminal moves, fd is the Doppler frequency shift between the mobile terminal and the base station, c is the propagation speed of electromagnetic waves, f is the current downlink working frequency of the base station, and v is the current moving speed of the mobile terminal.
Preferably, in the system for implementing the best neighbor prediction of the mobile terminal, the module 200 for acquiring the included angle and the signal strength further includes:
and the base station information acquisition unit is used for acquiring the base station signal change slope of each base station relative to the mobile terminal when the GPS signal of the mobile terminal is unavailable, and acquiring the base station with the base station signal change slope being more than or equal to 0.
Preferably, in the system for implementing optimal neighbor prediction of a mobile terminal, the reporting interconnection module 300 specifically includes:
a second judging unit, configured to judge whether there is a base station in which the signal strength of the base station is greater than the first signal strength threshold and an included angle between a connection line between the mobile terminal and the base station and a direction line in which the mobile terminal moves is a minimum value among the multiple included angles when a GPS signal of the mobile terminal is available;
the first interconnection unit is used for reporting a connection request of the mobile terminal to the base station if the base station exists, the signal intensity of the base station is greater than the first signal intensity threshold value, and the included angle between the connection line of the mobile terminal and the base station and the direction line of the motion of the mobile terminal is the minimum value of the included angles;
the second interconnection unit is used for reporting the connection request of the mobile terminal to the base station if the base station has the signal intensity smaller than the first signal intensity threshold value and larger than a preset second signal intensity threshold value, the current moving speed of the mobile terminal is larger than a preset second speed threshold value, and the included angle between the connection line of the mobile terminal and the base station and the direction line of the movement of the mobile terminal is the minimum value of a plurality of included angles; wherein the second signal strength threshold is less than the first signal strength threshold, and the second speed threshold is greater than the first speed threshold.
Preferably, in the system for implementing optimal neighbor prediction of a mobile terminal, the reporting interconnection module 300 further includes:
and the third interconnection unit is used for acquiring the base station of which the signal intensity is greater than the first signal intensity threshold value, the included angle between the connecting line of the mobile terminal and the base station and the direction line of the movement of the mobile terminal is less than 90 degrees and the signal intensity of the base station is the maximum value when the GPS signal of the mobile terminal is unavailable, and reporting the connection request of the mobile terminal to the base station.
In summary, the method and system for implementing the optimal neighbor prediction of the mobile terminal provided by the present invention include: acquiring the current moving speed of the mobile terminal, and judging whether the current moving speed is greater than a preset first speed threshold value; if the current moving speed is greater than the first speed threshold, acquiring base stations of which the distance from the mobile terminal is smaller than a preset distance threshold, and acquiring included angles between a connection line of the mobile terminal and each base station and a direction line in which the mobile terminal moves and signal intensity of each base station; and acquiring the base station of which the signal intensity is greater than the first signal intensity threshold value and the included angle between the connection line of the mobile terminal and the base station and the direction line of the motion of the mobile terminal is the minimum value of the included angles, and reporting the connection request of the mobile terminal to the base station. The invention realizes that the next best adjacent cell is intelligently predicted in the process of high-speed movement of the mobile terminal, and only the measurement result of the best adjacent cell is reported to the corresponding base station, thereby ensuring that the base station can provide longer service time after switching, and reducing ping-pong switching of front and back cells and disordered invalid switching of lateral cells.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a computer-readable storage medium, and when the computer program is executed, the processes of the embodiments of the methods described above can be included. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), a Random Access Memory (RAM), or the like.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (10)
1. A method for realizing the prediction of the best adjacent cell of a mobile terminal is characterized by comprising the following steps:
A. acquiring the current moving speed of the mobile terminal, and judging whether the current moving speed is greater than a preset first speed threshold value;
B. if the current moving speed is greater than the first speed threshold, acquiring base stations of which the distance from the mobile terminal is smaller than a preset distance threshold, and acquiring included angles between a connection line of the mobile terminal and each base station and a direction line in which the mobile terminal moves and signal intensity of each base station;
C. and acquiring the base station of which the signal intensity is greater than a preset first signal intensity threshold value and the included angle between the connection line of the mobile terminal and the base station and the direction line of the motion of the mobile terminal is the minimum value of the included angles, and reporting the connection request of the mobile terminal to the base station.
2. The method for implementing the optimal neighbor prediction of the mobile terminal according to claim 1, wherein the step B specifically includes:
b1, if the current moving speed is larger than the first speed threshold value, judging whether the GPS signal of the mobile terminal is available;
b2, when the GPS signal of the mobile terminal is available, obtaining a base station whose distance from the mobile terminal is less than a preset distance threshold, and obtaining an included angle between a connection line between the mobile terminal and each base station and a direction line in which the mobile terminal moves, and a signal intensity of each base station according to θ ═ arccos (fd × /) and f ×/; the method comprises the following steps that theta is an included angle between a connecting line of a mobile terminal and a base station and a direction line where the mobile terminal moves, fd is the Doppler frequency shift between the mobile terminal and the base station, c is the propagation speed of electromagnetic waves, f is the current downlink working frequency of the base station, and v is the current moving speed of the mobile terminal.
3. The method for implementing optimal neighbor prediction of a mobile terminal according to claim 2, wherein said step B2 is followed by further comprising:
b3, when the GPS signal of the mobile terminal is not available, acquiring the base station signal change slope of each base station relative to the mobile terminal, and acquiring the base station with the base station signal change slope being greater than or equal to 0.
4. The method for implementing optimal neighbor prediction of a mobile terminal according to claim 2 or 3, wherein the step C specifically includes:
c1, when the GPS signal of the mobile terminal is available, judging whether a base station exists, wherein the signal intensity of the base station is greater than the first signal intensity threshold value, and the included angle between the connection line of the mobile terminal and the base station and the direction line of the mobile terminal movement is the minimum value of the plurality of included angles;
c2, if there is a base station whose signal strength is greater than the first signal strength threshold value and the included angle between the connection line of the mobile terminal and the base station and the direction line of the mobile terminal motion is the minimum value of the included angles, reporting the connection request of the mobile terminal to the base station;
c3, if there is a base station whose signal strength is smaller than the first signal strength threshold and larger than a preset second signal strength threshold, whose current moving speed is larger than a preset second speed threshold, and whose included angle between the connection line of the mobile terminal and the base station and the direction line of the mobile terminal movement is the minimum value of the multiple included angles, reporting the connection request of the mobile terminal to the base station; wherein the second signal strength threshold is less than the first signal strength threshold, and the second speed threshold is greater than the first speed threshold.
5. The method for implementing optimal neighbor prediction of a mobile terminal according to claim 4, wherein the step C further comprises:
and C4, when the GPS signal of the mobile terminal is unavailable, acquiring the base station of which the signal intensity is greater than the first signal intensity threshold value, the included angle between the connecting line of the mobile terminal and the base station and the direction line of the motion of the mobile terminal is less than 90 degrees and the signal intensity of the base station is the maximum value, and reporting the connection request of the mobile terminal to the base station.
6. A system for realizing optimal neighbor prediction of a mobile terminal is characterized by comprising:
the speed acquisition and judgment module is used for acquiring the current moving speed of the mobile terminal and judging whether the current moving speed is greater than a preset first speed threshold value or not;
an included angle and signal strength acquisition module, configured to, if the current moving speed is greater than the first speed threshold, acquire a base station whose distance from the mobile terminal is less than a preset distance threshold, and acquire an included angle between a connection line between the mobile terminal and each base station and a direction line in which the mobile terminal moves, and a signal strength of each base station;
and the reporting interconnection module is used for acquiring the base station of which the signal intensity is greater than a preset first signal intensity threshold value and the included angle between the connection line of the mobile terminal and the base station and the direction line of the motion of the mobile terminal is the minimum value of the included angles, and reporting the connection request of the mobile terminal to the base station.
7. The system for implementing optimal neighbor prediction of a mobile terminal according to claim 6, wherein the module for acquiring an included angle and signal strength specifically comprises:
the first judging unit is used for judging whether a GPS signal of the mobile terminal is available or not when the current moving speed is greater than the first speed threshold;
an included angle obtaining unit, configured to obtain, when a GPS signal of the mobile terminal is available, base stations whose distance from the mobile terminal is smaller than a preset distance threshold, and obtain, according to θ ═ arccos (fd × c)/(f × v), included angles between a connection line between the mobile terminal and each base station and a direction line in which the mobile terminal moves, and a signal strength of each base station; the method comprises the following steps that theta is an included angle between a connecting line of a mobile terminal and a base station and a direction line where the mobile terminal moves, fd is the Doppler frequency shift between the mobile terminal and the base station, c is the propagation speed of electromagnetic waves, f is the current downlink working frequency of the base station, and v is the current moving speed of the mobile terminal.
8. The system for implementing optimal neighbor prediction of a mobile terminal according to claim 7, wherein the module for obtaining an included angle and a signal strength further comprises:
and the base station information acquisition unit is used for acquiring the base station signal change slope of each base station relative to the mobile terminal when the GPS signal of the mobile terminal is unavailable, and acquiring the base station with the base station signal change slope being more than or equal to 0.
9. The system for implementing prediction of optimal neighboring cells of a mobile terminal according to claim 7 or 8, wherein the reporting interconnection module specifically includes:
a second judging unit, configured to judge whether there is a base station in which the signal strength of the base station is greater than the first signal strength threshold and an included angle between a connection line between the mobile terminal and the base station and a direction line in which the mobile terminal moves is a minimum value among the multiple included angles when a GPS signal of the mobile terminal is available;
the first interconnection unit is used for reporting a connection request of the mobile terminal to the base station if the base station exists, the signal intensity of the base station is greater than the first signal intensity threshold value, and the included angle between the connection line of the mobile terminal and the base station and the direction line of the motion of the mobile terminal is the minimum value of the included angles;
the second interconnection unit is used for reporting the connection request of the mobile terminal to the base station if the base station has the signal intensity smaller than the first signal intensity threshold value and larger than a preset second signal intensity threshold value, the current moving speed of the mobile terminal is larger than a preset second speed threshold value, and the included angle between the connection line of the mobile terminal and the base station and the direction line of the movement of the mobile terminal is the minimum value of a plurality of included angles; wherein the second signal strength threshold is less than the first signal strength threshold, and the second speed threshold is greater than the first speed threshold.
10. The system for implementing optimal neighbor prediction of a mobile terminal according to claim 9, wherein the reporting interconnection module further comprises:
and the third interconnection unit is used for acquiring the base station of which the signal intensity is greater than the first signal intensity threshold value, the included angle between the connecting line of the mobile terminal and the base station and the direction line of the movement of the mobile terminal is less than 90 degrees and the signal intensity of the base station is the maximum value when the GPS signal of the mobile terminal is unavailable, and reporting the connection request of the mobile terminal to the base station.
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