JP6104562B2 - Handover parameter notification device, handover parameter notification method, and computer program - Google Patents

Description

  The present invention relates to a handover parameter notification device, a handover parameter notification method, and a computer program.

  In recent years, standardization work for a cellular system called an LTE (Long Term Evolution) system has been promoted in the 3GPP (3rd Generation Partnership Project) of the standardization organization. Non-Patent Document 1 describes a technique for distributing a load among base stations by adjusting a handover timing of a mobile terminal using a handover parameter in an LTE system. Non-Patent Document 2 describes handover parameters in the LTE system.

  FIG. 8 is a conceptual diagram for explaining the inter-base station load distribution method using handover parameters. In FIG. 8, the base station BS1 is a base station determined to have a low load. The base station BS2 is a base station that is determined to have a high load. The load on the base station is represented by the number of terminals connected to the base station, the radio resource usage rate, the CPU (central processing unit) usage rate of the base station main device, and the like.

  In the example of FIG. 8, in order to distribute the load between the base stations BS1 and BS2, the mobile terminal connected to the high-load base station BS2 is handed over to the low-load base station BS1, thereby causing the high-load base station to It is conceivable to reduce the load on BS2. For this reason, in the inter-base station load distribution method using handover parameters, among the mobile terminals MS1 and MS2 located near the boundary between the cell A of the base station BS1 and the cell B of the base station BS2, the high-load base station BS2 For the mobile terminal MS1 connected to, handover parameters are set so that the handover timing from the base station BS2 to the low-load base station BS1 is advanced. On the other hand, for the mobile terminal MS2 connected to the low load base station BS1, handover parameters are set so as to delay the handover timing from the base station BS1 to the high load base station BS2.

3GPP, TS36.300, v9.8.0, 2011-09. 3GPP, TS36.331, v9.3.0, 2010-06.

  However, the inter-base station load distribution method using the handover parameter described above has the following problems.

  First, in FIG. 8, the mobile terminal MS1 connected to the high-load base station BS2 can easily be handed over to the low-load base station BS1 due to earlier handover timing, while the base station BS2 immediately after handing over to the base station BS1. “Ping-Pong handover” is likely to occur repeatedly.

  Also, the mobile terminal MS2 connected to the low-load base station BS1 becomes difficult to hand over to the high-load base station BS2 due to the late handover timing. However, for the mobile terminal MS2 moving at high speed from the cell A to the cell B, the handover timing may be delayed, so that the handover to the base station BS2 may not be performed smoothly.

  Further, when the handover timing to the low-load base station BS1 is advanced for the “mobile terminal moving at high speed” connected to the high-load second base station, the low-load base station BS1 There is a possibility that the handover failure event “HO (Hand Over) to Wrong Cell” for reconnecting to a base station in the vicinity different from the base stations BS1 and BS2 will increase more than usual after failing to hand over to the base station and disconnecting. .

  The present invention has been made in consideration of such circumstances, and adapts to the prevention of “Ping-Pong handover” and handover during high-speed movement when performing load sharing between base stations using handover parameters. An object is to provide a handover parameter notification device, a handover parameter notification method, and a computer program.

  In order to solve the above-described problem, a handover parameter notification device according to the present invention adjusts a handover timing from a first base station determined to have a low load to a second base station determined to have a high load. In a handover parameter notification device that outputs a handover parameter of the first, a storage unit that stores a first changed handover parameter for adjusting to a handover timing that is later than the standard handover timing, and a terminal management unit that grasps the handover status of the mobile terminal An output unit that outputs the first changed handover parameter when a mobile terminal that is a handover parameter notification destination is executing a handover from the second base station to the first base station; It is characterized by having.

  A handover parameter notification device according to the present invention outputs a handover parameter for adjusting a handover timing from a first base station determined to be low load to a second base station determined to be high load. In the apparatus, a storage unit that stores a first changed handover parameter for adjusting to a handover timing that is later than a standard handover timing, a connection base station related to a mobile terminal, and a connection time to the first base station are grasped The terminal management unit and the connection base station immediately before the mobile terminal that is the handover parameter notification destination are the second base station, and the latest connection time of the mobile terminal to the first base station is specified. An output unit that outputs the first changed handover parameter when the value is within the value. The features.

  A handover parameter notification device according to the present invention outputs a handover parameter for adjusting a handover timing from a second base station determined to be high load to a first base station determined to be low load. In the apparatus, a storage unit for storing a standard handover parameter for adjusting to a standard handover timing, a second changed handover parameter for adjusting to a handover timing earlier than the standard handover timing, and a handover situation of the mobile terminal And when the mobile terminal that is the handover parameter notification destination is executing a handover from the first base station to the second base station, the standard handover parameter is output. If not, the second Characterized by comprising an output unit for outputting the changed handover parameters, the.

  A handover parameter notification device according to the present invention outputs a handover parameter for adjusting a handover timing from a second base station determined to be high load to a first base station determined to be low load. In the apparatus, a storage unit for storing a standard handover parameter for adjusting to a standard handover timing, a second changed handover parameter for adjusting to a handover timing earlier than the standard handover timing, and a connection base for the mobile terminal A terminal management unit that grasps the connection time to the station and the second base station, and the connection base station immediately before the mobile terminal that is the notification destination of the handover parameter is the first base station, and the mobile terminal The most recent connection time to the second base station is within a specified value It is when outputting the standard handover parameter, and otherwise characterized by comprising an output unit that outputs the second modified handover parameters.

  A handover parameter notification device according to the present invention outputs a handover parameter for adjusting a handover timing from a second base station determined to be high load to a first base station determined to be low load. In the apparatus, a storage unit for storing a standard handover parameter for adjusting to a standard handover timing, a second changed handover parameter for adjusting to a handover timing earlier than the standard handover timing, and a handover situation of the mobile terminal A terminal management unit that recognizes the mobile station and a mobile terminal that is a handover parameter notification destination outputs the standard handover parameter when a handover is being performed from an arbitrary base station to the second base station; In the second variant An output unit for outputting a handover parameter, characterized by comprising a.

  A handover parameter notification device according to the present invention outputs a handover parameter for adjusting a handover timing from a second base station determined to be high load to a first base station determined to be low load. In the apparatus, a storage unit that stores a standard handover parameter for adjusting to a standard handover timing, a second changed handover parameter for adjusting to a handover timing earlier than the standard handover timing, and the first related to the mobile terminal A terminal management unit that grasps the connection time to the second base station, and the standard handover when the most recent connection time to the second base station of the mobile terminal to which the handover parameter is notified is within a specified value Output a parameter, otherwise Characterized by comprising the output unit for outputting the changed handover parameters, the.

  The handover parameter notification method according to the present invention is a handover parameter notification for outputting a handover parameter for adjusting a handover timing from a first base station determined to be low load to a second base station determined to be high load. A storage step of storing a first changed handover parameter for adjusting to a handover timing later than the standard handover timing in a storage unit; a terminal management step of grasping a handover status of the mobile terminal; and a handover parameter An output step of outputting the first changed handover parameter when the mobile terminal that is the notification destination is executing a handover from the second base station to the first base station. And

  The handover parameter notification method according to the present invention is a handover parameter notification for outputting a handover parameter for adjusting a handover timing from a first base station determined to be low load to a second base station determined to be high load. A storage step of storing, in a storage unit, a first changed handover parameter for adjusting to a handover timing that is slower than a standard handover timing, and a connection base station for a mobile terminal and the first base station A terminal management step for grasping the connection time, and the connection base station immediately before the mobile terminal to which the handover parameter is notified is the second base station, and the mobile terminal is closest to the first base station; The first changed handover parameter is output when the connection time is within a specified value Characterized in that it comprises a force step.

  The handover parameter notification method according to the present invention is a handover parameter notification for outputting a handover parameter for adjusting a handover timing from a second base station determined to be high load to a first base station determined to be low load. A storage step of storing in a storage unit a standard handover parameter for adjusting to a standard handover timing and a second changed handover parameter for adjusting to a handover timing earlier than the standard handover timing; A terminal management step for grasping the state of handover of the terminal, and the standard handover parameter when the mobile terminal that is the handover parameter notification destination is executing a handover from the first base station to the second base station. And so on When it has is characterized in that it comprises an output step of outputting the second modified handover parameters.

  The handover parameter notification method according to the present invention is a handover parameter notification for outputting a handover parameter for adjusting a handover timing from a second base station determined to be high load to a first base station determined to be low load. A storage step of storing in a storage unit a standard handover parameter for adjusting to a standard handover timing and a second changed handover parameter for adjusting to a handover timing earlier than the standard handover timing; A terminal management step for grasping the connection time to the connection base station and the second base station related to the terminal, and the connection base station immediately before the mobile terminal to which the handover parameter is notified is the first base station; And the mobile terminal nearest to the second base station If connection time is within the predetermined value and outputs the standard handover parameter, otherwise, it characterized in that it comprises and an output step of outputting the second modified handover parameters.

  The handover parameter notification method according to the present invention is a handover parameter notification for outputting a handover parameter for adjusting a handover timing from a second base station determined to be high load to a first base station determined to be low load. A storage step of storing in a storage unit a standard handover parameter for adjusting to a standard handover timing and a second changed handover parameter for adjusting to a handover timing earlier than the standard handover timing; A terminal management step for grasping the handover status of the terminal, and the standard handover parameter is output when the mobile terminal to which the handover parameter is notified is executing a handover from an arbitrary base station to the second base station And not The case is characterized in that it comprises an output step of outputting the second modified handover parameters.

  The handover parameter notification method according to the present invention is a handover parameter notification for outputting a handover parameter for adjusting a handover timing from a second base station determined to be high load to a first base station determined to be low load. A storage step of storing in a storage unit a standard handover parameter for adjusting to a standard handover timing and a second changed handover parameter for adjusting to a handover timing earlier than the standard handover timing; A terminal management step for grasping the connection time to the second base station for the terminal, and the latest connection time to the second base station of the mobile terminal to which the handover parameter is notified is within a specified value Output the standard handover parameter, and so on If not, characterized in that it comprises an output step of outputting the second modified handover parameters.

  The computer program according to the present invention performs a handover parameter notification process for outputting a handover parameter for adjusting a handover timing from a first base station determined to be a low load to a second base station determined to be a high load. A storage step for storing a first changed handover parameter for adjusting to a handover timing later than the standard handover timing in a storage unit; and a terminal management step for grasping a handover status of the mobile terminal And an output step of outputting the first changed handover parameter when the mobile terminal to which the handover parameter is notified is executing a handover from the second base station to the first base station. Computer to run on a computer Characterized in that it is a chromatography data program.

  The computer program according to the present invention performs a handover parameter notification process for outputting a handover parameter for adjusting a handover timing from a first base station determined to be a low load to a second base station determined to be a high load. A storage step of storing in a storage unit a first changed handover parameter for adjusting to a handover timing that is later than a standard handover timing, a connected base station for a mobile terminal, and the first A terminal management step for grasping the connection time to the base station, and the connection base station immediately before the mobile terminal to which the handover parameter is notified is the second base station, and the first base of the mobile terminal If the latest connection time to the station is within a specified value, the first changed hand Characterized in that it is a computer program for executing an output step of outputting over server parameters, to the computer.

  The computer program according to the present invention performs a handover parameter notification process for outputting a handover parameter for adjusting a handover timing from a second base station determined to be highly loaded to a first base station determined to be lightly loaded. A computer program for performing storage in which a standard handover parameter for adjusting to a standard handover timing and a second changed handover parameter for adjusting to a handover timing earlier than the standard handover timing are stored in a storage unit Step, a terminal management step for grasping a handover status of the mobile terminal, and a mobile terminal that is a handover parameter notification destination is executing a handover from the first base station to the second base station. Standard handover Outputs parameters, characterized in that the otherwise is a computer program for executing an output step of outputting the second modified handover parameters to the computer.

  The computer program according to the present invention performs a handover parameter notification process for outputting a handover parameter for adjusting a handover timing from a second base station determined to be highly loaded to a first base station determined to be lightly loaded. A computer program for performing storage in which a standard handover parameter for adjusting to a standard handover timing and a second changed handover parameter for adjusting to a handover timing earlier than the standard handover timing are stored in a storage unit A terminal management step for grasping a connection base station connected to the mobile terminal and a connection time to the second base station, and a connection base station immediately before the mobile terminal to which a handover parameter is notified is the first base Station and the mobile terminal An output step of outputting the standard handover parameter if the latest connection time to the second base station is within a prescribed value, and outputting the second changed handover parameter otherwise; It is a computer program for making it run.

  The computer program according to the present invention performs a handover parameter notification process for outputting a handover parameter for adjusting a handover timing from a second base station determined to be highly loaded to a first base station determined to be lightly loaded. A computer program for performing storage in which a standard handover parameter for adjusting to a standard handover timing and a second changed handover parameter for adjusting to a handover timing earlier than the standard handover timing are stored in a storage unit Step, a terminal management step for grasping a handover situation of the mobile terminal, and the standard when the mobile terminal that is a handover parameter notification destination is executing a handover from an arbitrary base station to the second base station. Handover parameters Outputs over data, characterized in that the otherwise is a computer program for executing an output step of outputting the second modified handover parameters to the computer.

  The computer program according to the present invention performs a handover parameter notification process for outputting a handover parameter for adjusting a handover timing from a second base station determined to be highly loaded to a first base station determined to be lightly loaded. A computer program for performing storage in which a standard handover parameter for adjusting to a standard handover timing and a second changed handover parameter for adjusting to a handover timing earlier than the standard handover timing are stored in a storage unit A terminal management step for grasping a connection time to the second base station related to the mobile terminal, and a latest connection time to the second base station of the mobile terminal to which a handover parameter is notified If the Outputs parameter, otherwise, wherein the computer program for executing an output step of outputting the second modified handover parameters to the computer.

  According to the present invention, when load sharing between base stations using a handover parameter is performed, effects of preventing “Ping-Pong handover” and adapting to handover during high-speed movement can be obtained.

It is a block diagram which shows the structural example of the handover parameter notification apparatus 1 which concerns on one Embodiment of this invention. It is a flowchart of Example 1 of the handover parameter notification process according to the present invention. It is a flowchart of Example 2 of the handover parameter notification processing according to the present invention. It is a flowchart of Example 3 of the handover parameter notification process according to the present invention. It is a flowchart of Example 4 of the handover parameter notification processing according to the present invention. It is a flowchart of Example 5 of the handover parameter notification processing according to the present invention. It is a flowchart of Example 6 of the handover parameter notification processing according to the present invention. It is a conceptual diagram for demonstrating the load distribution method between base stations using a handover parameter.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram illustrating a configuration example of a handover parameter notification device 1 according to an embodiment of the present invention. The handover parameter notification device 1 is provided in each base station. The handover parameter notification device 1 outputs a handover parameter notified from the base station to the mobile terminal. The handover parameter is information for adjusting the handover timing of the mobile terminal. The mobile terminal determines the handover timing based on the handover parameter.

  In FIG. 1, the handover parameter notification device 1 includes an input unit 11, a storage unit 12, an output unit 13, a base station management unit 14, and a terminal management unit 15. The input unit 11 inputs data. The storage unit 12 stores data. The output unit 13 outputs data. The base station management unit 14 manages base stations. The terminal management unit 15 manages mobile terminals. Each part 11, 12, 13, 14, 15 is connected so that data can be transmitted and received.

  Hereinafter, a handover parameter notification process performed by the handover parameter notification device 1 according to the present embodiment will be described with reference to an example. In the following embodiment, the example of FIG. 8 is used. In the example of FIG. 8, the base station BS1 is determined to have a low load, and the base station BS2 is determined to have a high load.

  In the first embodiment, the handover parameter notification device 1 outputs a handover parameter for adjusting the handover timing from the base station BS1 (low load) to the base station BS2 (high load). This handover parameter is notified from the base station BS1 (low load) to the mobile terminal.

  The storage unit 12 of the handover parameter notification device 1 stores the standard handover parameter and the first changed handover parameter. The standard handover parameter is a handover parameter for adjusting the handover timing of the mobile terminal to the standard handover timing. The standard handover timing is a predetermined handover timing used in a normal state, for example, when load distribution between base stations using a handover parameter is not performed.

  The first changed handover parameter is a handover parameter for adjusting to a handover timing that is later than the standard handover timing. The first changed handover parameter is used in the inter-base station load distribution method using the handover parameter according to the present embodiment.

  The standard handover parameter and the first changed handover parameter may be stored in the storage unit 12 in advance, or may be appropriately input by the input unit 11 and stored in the storage unit 12 and updated.

  The base station management unit 14 grasps the load state of the base station BS1. Base station load data indicating the load state of the base station BS1 is input by the input unit 11. In the first embodiment, the base station management unit 14 recognizes that the base station BS1 has a low load based on the base station load data.

  The terminal management unit 15 grasps the handover status of the mobile terminal. Terminal handover status data indicating the handover status of the mobile terminal is input by the input unit 11.

  FIG. 2 is a flowchart of Embodiment 1 of the handover parameter notification process according to the present invention. The operation of the handover parameter notification device 1 according to the first embodiment will be described with reference to FIG.

(Step S11)
The output unit 13 determines the timing for notifying the mobile terminal of the handover parameter. The determination of the notification timing is performed based on the status of the handover of the mobile terminal grasped by the terminal management unit 15.

(Step S12)
The output unit 13 determines whether or not the mobile terminal is executing a handover from the base station BS2 (high load) to the base station BS1 (low load). As a result, if the handover is being executed, the process proceeds to step S13, and if not, the process proceeds to step S14.

(Step S13)
The output unit 13 reads the first changed handover parameter from the storage unit 12 and outputs it as a handover parameter to be notified to the mobile terminal.

(Step S14)
The output unit 13 reads the standard handover parameter from the storage unit 12 and outputs it as a handover parameter to be notified to the mobile terminal.

  As a result, in FIG. 8, the mobile station MS1 that is handed over from the base station BS2 (high load) to the base station BS1 (low load) is transferred from the base station BS1 (low load) to the base station BS1 by the first changed handover parameter. As a handover timing to the station BS2 (high load), a handover timing later than the standard handover timing is set. As a result, the mobile terminal MS1 performs handover from the base station BS2 (high load) to the base station BS1 (low load) at a timing earlier than the standard handover timing in order to distribute the load between base stations. Handover from (low load) to the base station BS2 (high load) becomes difficult. As a result, an effect of preventing “Ping-Pong handover” can be obtained.

  Also, standard handover timing is set for mobile terminals other than the mobile terminal MS1 that is handed over from the base station BS2 (high load) to the base station BS1 (low load). Thereby, the mobile terminal MS2 moving at high speed from the base station BS1 (low load) to the base station BS2 (high load) can smoothly perform handover to the base station BS2 at the standard handover timing.

  In the second embodiment, as in the first embodiment, the handover parameter notification device 1 outputs a handover parameter for adjusting the handover timing from the base station BS1 (low load) to the base station BS2 (high load). This handover parameter is notified from the base station BS1 (low load) to the mobile terminal. Hereinafter, differences from the first embodiment will be mainly described.

  In the second embodiment, the storage unit 12 stores a standard handover parameter, a first changed handover parameter, and terminal connection history data. The terminal connection history data indicates the base station (connected base station) to which the mobile terminal is connected and the connection time. The terminal management unit 15 grasps the connection time to the connection base station and the base station BS1 (low load) related to the mobile terminal based on the terminal connection history data. The terminal connection history data is input from the input unit 11.

  FIG. 3 is a flowchart of Embodiment 2 of the handover parameter notification process according to the present invention. With reference to FIG. 3, the operation of the handover parameter notification device 1 according to the second embodiment will be described.

(Step S21)
Based on the terminal connection history data, the terminal management unit 15 grasps the latest connection time to the connection base station and the base station BS1 (low load) related to the mobile terminal.

(Step S22)
The output unit 13 determines whether or not the base station BS2 (high load) is the immediately preceding connected base station based on the connected base station related to the mobile terminal ascertained by the terminal management unit 15. As a result, if the base station BS2 (high load) is the last connected base station, the process proceeds to step S23, and if not, the process proceeds to step S25.

(Step S23)
The output unit 13 determines whether or not the connection time is within a specified value based on the latest connection time to the base station BS1 (low load) grasped by the terminal management unit 15. As a result, if it is within the specified value, the process proceeds to step S24, and if not, the process proceeds to step S25.

(Step S24)
The output unit 13 reads the first changed handover parameter from the storage unit 12 and outputs it as a handover parameter to be notified to the mobile terminal.

(Step S25)
The output unit 13 reads the standard handover parameter from the storage unit 12 and outputs it as a handover parameter to be notified to the mobile terminal.

  As a result, in FIG. 8, the mobile station MS1 that has handed over from the base station BS2 (high load) to the base station BS1 (low load) within the most recent specified time is set to the base station BS1 (low load) by the first changed handover parameter. As a handover timing from the load) to the base station BS2 (high load), a handover timing later than the standard handover timing is set. As a result, the mobile terminal MS1 performs handover from the base station BS2 (high load) to the base station BS1 (low load) at a timing earlier than the standard handover timing in order to distribute the load between base stations. Handover from (low load) to the base station BS2 (high load) becomes difficult. As a result, an effect of preventing “Ping-Pong handover” can be obtained.

  Also, standard handover timing is set for mobile terminals other than the mobile terminal MS1 that has handed over within the most recent specified time from the base station BS2 (high load) to the base station BS1 (low load). Thereby, the mobile terminal MS2 moving at high speed from the base station BS1 (low load) to the base station BS2 (high load) can smoothly perform handover to the base station BS2 at the standard handover timing.

  In the third embodiment, the handover parameter notification device 1 outputs a handover parameter for adjusting the handover timing from the base station BS2 (high load) to the base station BS1 (low load). This handover parameter is notified from the base station BS2 (high load) to the mobile terminal.

  The storage unit 12 of the handover parameter notification device 1 stores the standard handover parameter and the second changed handover parameter. Standard handover parameters are the same as in the first embodiment.

  The second changed handover parameter is a handover parameter for adjusting to a handover timing earlier than the standard handover timing. The second changed handover parameter is used in the inter-base station load distribution method using the handover parameter according to the present embodiment.

  The standard handover parameter and the second changed handover parameter may be stored in advance in the storage unit 12, or may be appropriately input by the input unit 11, stored in the storage unit 12, and updated.

  The base station management unit 14 grasps the load state of the base station BS2. Base station load data indicating the load state of the base station BS2 is input by the input unit 11. In the third embodiment, the base station management unit 14 recognizes that the base station BS2 has a high load based on the base station load data.

  The terminal management unit 15 grasps the handover status of the mobile terminal. Terminal handover status data indicating the handover status of the mobile terminal is input by the input unit 11.

  FIG. 4 is a flowchart of Embodiment 3 of the handover parameter notification process according to the present invention. The operation of the handover parameter notification device 1 according to the third embodiment will be described with reference to FIG.

(Step S31)
The output unit 13 determines the timing for notifying the mobile terminal of the handover parameter. The determination of the notification timing is performed based on the status of the handover of the mobile terminal grasped by the terminal management unit 15.

(Step S32)
The output unit 13 determines whether the mobile terminal is performing a handover from the base station BS1 (low load) to the base station BS2 (high load). As a result, if the handover is being executed, the process proceeds to step S33, and if not, the process proceeds to step S34.

(Step S33)
The output unit 13 reads the standard handover parameter from the storage unit 12 and outputs it as a handover parameter to be notified to the mobile terminal.

(Step S34)
The output unit 13 reads the second changed handover parameter from the storage unit 12 and outputs it as a handover parameter to be notified to the mobile terminal.

  Accordingly, in FIG. 8, except for the mobile terminal MS2 that is handed over from the base station BS1 (low load) to the base station BS2 (high load), the handover timing that is earlier than the standard handover timing by the second changed handover parameter. Will be set. As a result, the mobile terminal MS2 can easily be handed over from the base station BS2 (high load) to the base station BS1 (low load), which can contribute to reducing the load on the base station BS2 (high load).

  Also, standard handover timing is set for the mobile terminal MS2 that is handed over from the base station BS1 (low load) to the base station BS2 (high load). Thereby, normal handover performance is obtained.

  In the fourth embodiment, as in the third embodiment, the handover parameter notification device 1 outputs a handover parameter for adjusting the handover timing from the base station BS2 (high load) to the base station BS1 (low load). This handover parameter is notified from the base station BS2 (high load) to the mobile terminal. Hereinafter, differences from the third embodiment will be mainly described.

  In the third embodiment, the storage unit 12 stores a standard handover parameter, a second changed handover parameter, and terminal connection history data. The terminal connection history data is the same as that in the second embodiment. The terminal management unit 15 grasps the connection time to the connection base station and the base station BS2 (high load) related to the mobile terminal based on the terminal connection history data. The terminal connection history data is input from the input unit 11.

  FIG. 5 is a flowchart of Embodiment 4 of the handover parameter notification process according to the present invention. The operation of the handover parameter notification device 1 according to the fourth embodiment will be described with reference to FIG.

(Step S41)
The terminal management unit 15 grasps the latest connection time to the connection base station and the base station BS2 (high load) related to the mobile terminal based on the terminal connection history data.

(Step S42)
The output unit 13 determines whether or not the base station BS1 (low load) is the immediately preceding connected base station based on the connected base station related to the mobile terminal ascertained by the terminal management unit 15. As a result, if the base station BS1 (low load) is the immediately preceding connected base station, the process proceeds to step S43, and if not, the process proceeds to step S45.

(Step S43)
The output unit 13 determines whether or not the connection time is within a specified value based on the latest connection time to the base station BS2 (high load) grasped by the terminal management unit 15. As a result, if it is within the specified value, the process proceeds to step S44, and if not, the process proceeds to step S45.

(Step S44)
The output unit 13 reads the standard handover parameter from the storage unit 12 and outputs it as a handover parameter to be notified to the mobile terminal.

(Step S45)
The output unit 13 reads the second changed handover parameter from the storage unit 12 and outputs it as a handover parameter to be notified to the mobile terminal.

  As a result, in FIG. 8, except for the mobile terminal MS2 that has handed over from the base station BS1 (low load) to the base station BS2 (high load) within the latest specified time, the second changed handover parameter causes The earliest handover timing is set. As a result, the mobile terminal MS2 can easily be handed over from the base station BS2 (high load) to the base station BS1 (low load), which can contribute to reducing the load on the base station BS2 (high load).

  Also, standard handover timing is set for the mobile terminal MS2 that has handed over from the base station BS1 (low load) to the base station BS2 (high load) within the latest specified time. Thereby, normal handover performance is obtained.

  In the fifth embodiment, the handover parameter notification device 1 outputs a handover parameter for adjusting the handover timing from the base station BS2 (high load) to the base station BS1 (low load). This handover parameter is notified from the base station BS2 (high load) to the mobile terminal. The purpose of the fifth embodiment is to prevent the handover failure event “HO to Wrong Cell” from increasing more than usual. Hereinafter, differences from the third embodiment will be mainly described.

  The storage unit 12 of the handover parameter notification device 1 stores the standard handover parameter and the second changed handover parameter as in the third embodiment. As in the third embodiment, the base station management unit 14 recognizes that the base station BS2 is heavily loaded based on the base station load data. As in the third embodiment, the terminal management unit 15 grasps the handover status of the mobile terminal.

  FIG. 6 is a flowchart of Embodiment 5 of the handover parameter notification process according to the present invention. With reference to FIG. 6, the operation of the handover parameter notification device 1 according to the fifth embodiment will be described.

(Step S51)
The output unit 13 determines the timing for notifying the mobile terminal of the handover parameter. The determination of the notification timing is performed based on the status of the handover of the mobile terminal grasped by the terminal management unit 15.

(Step S52)
The output unit 13 determines whether or not the mobile terminal is executing a handover from an arbitrary base station BS3 to the base station BS2 (high load). As a result, if the handover is being executed, the process proceeds to step S53, and if not, the process proceeds to step S54.

(Step S53)
The output unit 13 reads the standard handover parameter from the storage unit 12 and outputs it as a handover parameter to be notified to the mobile terminal.

(Step S54)
The output unit 13 reads the second changed handover parameter from the storage unit 12 and outputs it as a handover parameter to be notified to the mobile terminal.

  As a result, the standard handover timing is set by the standard handover parameter for the mobile terminal that is handed over from the arbitrary base station BS3 to the base station BS2 (high load). As a result, normal handover performance can be obtained, so that the handover failure event “HO to Wrong Cell” can be prevented from increasing more than usual.

  In the sixth embodiment, as in the fifth embodiment, the handover parameter notification device 1 outputs a handover parameter for adjusting the handover timing from the base station BS2 (high load) to the base station BS1 (low load). This handover parameter is notified from the base station BS2 (high load) to the mobile terminal. As in the fifth embodiment, the sixth embodiment aims to prevent the handover failure event “HO to Wrong Cell” from increasing more than usual. Hereinafter, differences from the fifth embodiment will be mainly described.

  In the sixth embodiment, the storage unit 12 stores a standard handover parameter, a second changed handover parameter, and terminal connection history data. The terminal connection history data is the same as that in the second embodiment. The terminal management unit 15 grasps the connection time to the base station BS2 (high load) related to the mobile terminal based on the terminal connection history data. The terminal connection history data is input from the input unit 11.

  FIG. 7 is a flowchart of Example 6 of the handover parameter notification process according to the present invention. With reference to FIG. 7, the operation of the handover parameter notification device 1 according to the sixth embodiment will be described.

(Step S61)
The terminal management unit 15 grasps the latest connection time to the base station BS2 (high load) related to the mobile terminal based on the terminal connection history data.

(Step S62)
The output unit 13 determines whether or not the connection time is within a specified value based on the latest connection time to the base station BS2 (high load) grasped by the terminal management unit 15. As a result, if it is within the specified value, the process proceeds to step S63, and if not, the process proceeds to step S64.

(Step S63)
The output unit 13 reads the standard handover parameter from the storage unit 12 and outputs it as a handover parameter to be notified to the mobile terminal.

(Step S64)
The output unit 13 reads the second changed handover parameter from the storage unit 12 and outputs it as a handover parameter to be notified to the mobile terminal.

  As a result, the standard handover timing is set by the standard handover parameter for the mobile terminal that has handed over from the arbitrary base station to the base station BS2 (high load) within the latest specified time. As a result, normal handover performance can be obtained, so that the handover failure event “HO to Wrong Cell” can be prevented from increasing more than usual.

  According to the above-described embodiment, when load sharing between base stations using handover parameters is performed, effects such as prevention of “Ping-Pong handover” and adaptation to handover during high-speed movement can be obtained.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the specific structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included. For example, you may combine the said Example 1, 2, 3 or 4.

Also, a program for realizing each step shown in FIG. 2, FIG. 3, FIG. 4, FIG. 5, FIG. 6 or FIG. 7 is recorded on a computer-readable recording medium, and the program recorded on this recording medium is recorded. The handover parameter notification process may be performed by causing the computer system to read and execute the parameter. Here, the “computer system” may include an OS and hardware such as peripheral devices.
“Computer-readable recording medium” means a flexible disk, a magneto-optical disk, a ROM, a writable nonvolatile memory such as a flash memory, a portable medium such as a DVD (Digital Versatile Disk), and a built-in computer system. A storage device such as a hard disk.

Further, the “computer-readable recording medium” means a volatile memory (for example, DRAM (Dynamic DRAM) in a computer system that becomes a server or a client when a program is transmitted through a network such as the Internet or a communication line such as a telephone line. Random Access Memory)), etc., which hold programs for a certain period of time.
The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line.
The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, and what is called a difference file (difference program) may be sufficient.

DESCRIPTION OF SYMBOLS 1 ... Handover parameter notification apparatus, 11 ... Input part, 12 ... Memory | storage part, 13 ... Output part, 14 ... Base station management part, 15 ... Terminal management part

Claims (9)

In a handover parameter notification device that outputs a handover parameter for adjusting a handover timing from a first base station determined to be low load to a second base station determined to be high load,
A storage unit for storing a first changed handover parameter for adjusting to a handover timing later than the standard handover timing;
A terminal manager that grasps the handover status of the mobile terminal;
An output unit that outputs the first changed handover parameter when a mobile terminal that is a handover parameter notification destination is executing a handover from the second base station to the first base station;
A handover parameter notification device comprising: In a handover parameter notification device for outputting a handover parameter for adjusting a handover timing from a second base station determined to be high load to a first base station determined to be low load,
A storage unit for storing a standard handover parameter for adjusting to a standard handover timing, and a second changed handover parameter for adjusting to a handover timing earlier than the standard handover timing;
A terminal manager that grasps the handover status of the mobile terminal;
When the mobile terminal that is the handover parameter notification destination is executing a handover from the first base station to the second base station, the standard handover parameter is output; An output unit for outputting a changed handover parameter;
A handover parameter notification device comprising: In a handover parameter notification device for outputting a handover parameter for adjusting a handover timing from a second base station determined to be high load to a first base station determined to be low load,
A storage unit for storing a standard handover parameter for adjusting to a standard handover timing, and a second changed handover parameter for adjusting to a handover timing earlier than the standard handover timing;
A terminal manager that grasps the handover status of the mobile terminal;
When the mobile terminal to which the handover parameter is notified is executing a handover from an arbitrary base station to the second base station, the standard handover parameter is output; otherwise, the second changed handover is performed. An output unit for outputting parameters;
A handover parameter notification device comprising: A handover parameter notification method for outputting a handover parameter for adjusting a handover timing from a first base station determined to be low load to a second base station determined to be high load,
Storing a first changed handover parameter for adjusting to a handover timing slower than the standard handover timing in a storage unit;
A terminal management step for grasping the handover status of the mobile terminal;
An output step of outputting the first changed handover parameter when a mobile terminal that is a handover parameter notification destination is executing a handover from the second base station to the first base station;
A handover parameter notification method comprising: A handover parameter notification method for outputting a handover parameter for adjusting a handover timing from a second base station determined to be high load to a first base station determined to be low load,
A storage step of storing in a storage unit a standard handover parameter for adjusting to a standard handover timing, and a second changed handover parameter for adjusting to a handover timing earlier than the standard handover timing;
A terminal management step for grasping the handover status of the mobile terminal;
When the mobile terminal that is the handover parameter notification destination is executing a handover from the first base station to the second base station, the standard handover parameter is output; An output step for outputting the changed handover parameter;
A handover parameter notification method comprising: A handover parameter notification method for outputting a handover parameter for adjusting a handover timing from a second base station determined to be high load to a first base station determined to be low load,
A storage step of storing in a storage unit a standard handover parameter for adjusting to a standard handover timing, and a second changed handover parameter for adjusting to a handover timing earlier than the standard handover timing;
A terminal management step for grasping the handover status of the mobile terminal;
When the mobile terminal to which the handover parameter is notified is executing a handover from an arbitrary base station to the second base station, the standard handover parameter is output; otherwise, the second changed handover is performed. An output step for outputting parameters;
A handover parameter notification method comprising: A computer program for performing a handover parameter notification process for outputting a handover parameter for adjusting a handover timing from a first base station determined to be low load to a second base station determined to be high load. ,
Storing a first changed handover parameter for adjusting to a handover timing slower than the standard handover timing in a storage unit;
A terminal management step for grasping the handover status of the mobile terminal;
An output step of outputting the first changed handover parameter when a mobile terminal that is a handover parameter notification destination is executing a handover from the second base station to the first base station;
A computer program for causing a computer to execute. A computer program for performing handover parameter notification processing for outputting a handover parameter for adjusting a handover timing from a second base station determined to be high load to a first base station determined to be low load. ,
A storage step of storing in a storage unit a standard handover parameter for adjusting to a standard handover timing, and a second changed handover parameter for adjusting to a handover timing earlier than the standard handover timing;
A terminal management step for grasping the handover status of the mobile terminal;
When the mobile terminal that is the handover parameter notification destination is executing a handover from the first base station to the second base station, the standard handover parameter is output; An output step for outputting the changed handover parameter;
A computer program for causing a computer to execute. A computer program for performing handover parameter notification processing for outputting a handover parameter for adjusting a handover timing from a second base station determined to be high load to a first base station determined to be low load. ,
A storage step of storing in a storage unit a standard handover parameter for adjusting to a standard handover timing, and a second changed handover parameter for adjusting to a handover timing earlier than the standard handover timing;
A terminal management step for grasping the handover status of the mobile terminal;
When the mobile terminal to which the handover parameter is notified is executing a handover from an arbitrary base station to the second base station, the standard handover parameter is output; otherwise, the second changed handover is performed. An output step for outputting parameters;
A computer program for causing a computer to execute.

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