Motion sensing type vertical handover method based on GPS location information
A position information and vertical switching technology, applied in wireless communication, electrical components, etc., can solve the problems of large terminal prediction errors, increased algorithm complexity, and large errors
Inactive Publication Date: 2013-12-18
镇江青思网络科技有限公司
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Problems solved by technology
[0008] Since the received signal strength is easily affected by various noises, the algorithm has a large error in the prediction of the terminal motion state
The received signal strength RSS sampling value can be processed, such as Kalman filter processing on the access signal strength RSS, least squares polynomial fitting processing and other methods to reduce the impact of noise. Although the random error of RSS can be reduced, there are still relatively large Large error, while the processing of RSS increases the complexity of the algorithm and increases the system overhead
This scheme has a large prediction error for high-speed motion terminals
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[0073] simulation analysis
[0074] The minimum update cycle of the GPS location information of the terminal is 50ms. Since the RSS sampling period is 10ms. Therefore, when making a decision in each RSS sampling period, the GPS position information in the latest period and the GPS position information in the latest period are used. However, in order to better evaluate and analyze the performance of this method, the user's motion trajectory is as follows: figure 2 shown.
[0075] Among them, the point E is the midpoint of the line segment BC, and the length of the line segment EC is equal to that of the line segment SC. DF is a circular arc with the base station position O as the center. There are four situations for the user's movement: the first is that the user's initial position is at point S, the initial service network is UMTS, and the user moves to point E along the line segment SE, and the proportion is 40%; the second is that the user's initial position is at Poi...
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The invention provides a motion sensing type vertical handover method based on GPS location information. According to the motion sensing type vertical handover method based on the GPS location information, the location information of a terminal is obtained by means of the GPS technique, and the movement speed of the terminal is estimated and the residence time of the terminal within the covering range of a certain base station is judged according to the information. According to the motion sensing type vertical handover method based on the GPS location information, a valid shift factor is adopted, the valid shift factor can reflect the motion mode of a user, serious errors which are generated when the user moves back and forth, or makes circular motion around the base station or under exceptional circumstances are eliminated, the number of handover can be reduced obviously, and the available bandwidth is provided for the user; influence of stochastic noise which is generated when the motion state of the terminal is estimated by means of RSS historical records is avoided, cost of a system is reduced, the accuracy of estimation of the residence time is improved, vertical handover can be more reasonable, and the utilization rate of system resources is higher.
Description
Technical field: [0001] The invention belongs to the field of communication, in particular to the field of heterogeneous network switching Background technique [0002] The next generation network integrates a variety of wireless access technologies. Various networks cooperate with each other and complement each other to provide users with better wireless connections and meet the "ABC" requirements. Due to the overlapping coverage of different networks and the division of location areas of different networks, advanced location management technologies are required. Therefore, the mobility management technology in the next generation network is also a research hotspot. As far as switching management is concerned, it is necessary to detect the surrounding wireless environment at all times, automatically select the best network and seamlessly switch to this best network, and it is necessary to complete joint utilization of wireless resources and load balancing between different...
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IPC IPC(8): H04W36/14H04W36/32
Inventor 宋文广赵海涛姚凌云李大鹏
Owner 镇江青思网络科技有限公司