JP2006279626A - Mobile communication system, handover control method, mobile station, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile communication system whereby a mobile station suppresses consumption of channel resources of a plurality of base transceiver stations through the handover by the mobile station. <P>SOLUTION: In the mobile communication system wherein the mobile station MS measures reception power of the CPICH from each base transceiver station BTS and reports it to a radio network controller RNC and the RNC makes wireless connection of the BTS with the reception power greater than a prescribed threshold value α to the MS to carry out handover control, the MS replaces the reception powers greater than the threshold value α among the received powers of the CPICH from each BTS except the maximum reception power with the same value as the threshold value α (or a value smaller than the vallue α) (step A4), and reports the results to the RNC. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mobile communication system, a handover control method, a mobile station, and a program, and in particular, the mobile station measures the received signal level from each base station and reports it to the base station control device, and the base station control device The present invention relates to a mobile communication system, a handover control method, a mobile station, and a program that perform handover control by wirelessly connecting a base station having a large received signal level and a mobile station.

  In a mobile communication system using CDMA (Code Division Multiple Access), a mobile station (MS) performs soft handover when moving from one cell to another. The MS measures the received signal level from each radio base station (BTS) and reports it to the radio network controller (RNC), which is the base station controller, and the RNC communicates with the MS based on the received signal level reported by the MS. Soft handover control is performed by controlling the wireless connection between the BTSs. That is, the RNC performs soft handover control by wirelessly connecting a BTS and a MS having a received signal level that is greater than a predetermined handover threshold.

  FIG. 3 is a flowchart showing the operation of the conventional MS described above. As shown in FIG. 3, the MS measures the received power of the common pilot channel (CPICH) from each BTS (step C1), and rearranges the measured CPICH received power values from each BTS in descending order (step C2). . Then, the MS reports the CPICH received power value from each BTS rearranged in step C2 to the RNC via the currently connected BTS. Note that the MS repeatedly executes the above-described steps C1 to C3 while connected to the BTS.

  Next, based on the operation of the flowchart of FIG. 3, how the connection status with the BTS changes as the MS moves will be described with reference to FIGS.

  FIG. 4 is a system configuration diagram showing how the MS moves between service areas (cells). In FIG. 4, the service area 303 that the BTS 301 has can be considered equivalent to an area that the CPICH transmitted by the BTS 301 can reach. The service area 304 is an area where the CPICH transmitted from the BTS 302 can be reached. Here, assuming that the MS 305 moves from the service area 303 to the service area 304, reference signs A, B, C, D, and E indicate points on the route on which the MS 305 moves. The RNC 311 is connected to the BTSs 301 and 302.

  FIG. 5A is a diagram illustrating a change in the received power value Pi of CPICH transmitted from the BTS 301 and 302 and received by the MS 305 when the MS 305 moves from the service area 303 to the service area 304 in FIG. FIG. 5B is a diagram showing a connection status between the MS 305 and the BTSs 301 and 302 when the flowchart of FIG. 3 is followed.

  In FIG. 5A, CPICH reception power from the BTS 301 at the point A in FIG. 4 is P (301, A), CPICH reception power from the BTS 302 is P (302, A), and from the BTS 301 at the point B in FIG. CPICH received power of P (301, B), CPICH received power from BTS 302 P (302, B), CPICH received power from BTS 301 at point C in FIG. 4 P (301, C), CPICH from BTS 302 The received power is P (302, C), the CPICH received power from the BTS 301 at the point D in FIG. 4 is P (301, D), the CPICH received power from the BTS 302 is P (302, D), and the point E in FIG. CPICH received power from BTS 301 is P (301, E), CPICH received power from BTS 302 is P ( 02, E) to indicate, respectively.

  The dashed-dotted line in FIG. 5A indicates a preset handover threshold α, and if the CPICH reception power is larger than the threshold α, the BTS that transmits the CPICH establishes a wireless connection with the MS 305 under the control of the RNC. Do.

  Based on the above, the connection status with the BTSs 301 and 302 when the MS 305 moves from the point A to the point E as shown in FIG. 4 will be described. First, it is assumed that the MS 305 is connected to the BTS 301 at the point A. At this time, as shown in FIG. 5A, since P (301, A) is sufficiently larger than α and P (302, A) is smaller than α, MS 305 is not connected to BTS 302 (FIG. 5B). )reference). Note that the MS 305 at the point A reports actual measurement values arranged in the order of P (301, A) and P (302, A) as report values to the RNC in step C3 of FIG.

  Next, the point where the MS 305 moves toward the BTS 302 and P (302, B) becomes larger than α for the first time is defined as a point B. It is assumed that P (301, B) is larger than α at the point B. At this time, in step C3 of FIG. 3, the MS 305 reports to the RNC in the order of P (301, B) and P (302, B) via the BTS 301 to which the MS 305 is currently connected.

  Upon receiving this report, the RNC activates a soft handover (addition) process for the BTS 302 that exceeds α for the first time. As a result, the MS 305 newly starts a connection with the BTS 302. Therefore, as shown in FIG. 5B, the MS 305 is connected to the BTS 302 in addition to the BTS 301.

  Next, the MS 305 further moves toward the BTS 302, and a point where P (302, C) exceeds P (301, C) is defined as a point C. It is assumed that P (301, C) and P (302, C) are both greater than α at the point C. At this time, the report values P (302, C) and P (301, C) to the RNC that the MS 305 reports via the connected BTSs 301 and 302 remain the same as the point B and exceed α. The RNC causes the BTS 301 and 302 to continue the soft handover (connection) process. Therefore, as shown in FIG. 5B, the connection between the MS 305 and the BTSs 301 and 302 is continued.

  Next, the point where the MS 305 further moves toward the BTS 302 and P (301, D) is equal to or less than α for the first time is defined as a point D. It is assumed that P (302, D) is larger than α at the point D. At this time, the reported values to the RNC that the MS 305 reports via the connected BTSs 301 and 302 are P (302, D) and P (301, D), and P (301, D) is below α for the first time. In response to the BTS 301, the RNC activates a soft handover (deletion) process. As a result, the connection between the MS 305 and the BTS 301 is disconnected, and the MS 305 continues the connection only with the BTS 302 as shown in FIG.

  Finally, a state where the MS 305 further approaches the BTS 302, P (302, E) is sufficiently larger than α, and P (301, E) is smaller than α is set as a point E. At this time, the P (302, E) and P (301, E) reported to the RNC via the BTS 302 to which the MS 305 is connected are such that P (302, E) is larger than the threshold value α as in the case of the point D. , P (301, E) is not more than the threshold value α, the RNC keeps the BTS 302 in a state where the MS 305 is connected only to the BTS 302.

  As described above, in the handover control method in the conventional CDMA system, the MS305 is connected to both the BTS 301 and 302 between the point B and the point D in FIG. 4 where the CPICH received power value from each of the BTSs 301 and 302 exceeds α. A state of simultaneous connection occurs.

  Further, in Patent Document 1, as a soft handover control method for a CDMA mobile communication system, a soft handover rate of a base station is input, and software assigned to a mobile station existing in the cell of the base station based on the soft handover rate is input. A method for controlling the number of handover branches and performing soft handover based on the number of soft handover branches is described.

JP-A-11-215536

  The conventional CDMA mobile communication system described with reference to FIGS. 3 to 5 is a method based on the premise of a large-capacity BTS mainly for outdoor services, and the radio frequency resource ( Suitable for system configurations where the amount of interference) is a bottleneck.

  For example, if the MS is located between two BTSs (between point B and point D in FIG. 4), as described above, the MS performs a soft handover with both BTSs so that the transmission power from each BTS and There are merits of reducing transmission power from the MS to each BTS, reducing the amount of interference as a whole system, and suppressing power consumption.

  However, when applied to a narrow area such as indoors or underground, a BTS usually uses a small device, and thus it is difficult to accommodate many channel resources. In addition, due to the radio wave propagation characteristics in a closed space, the probability that the MS can receive CPICH from multiple BTSs regardless of the physical location of the MS increases. As a result, the MS consumes the individual channel resources of multiple base stations. The time in the soft handover state to occupy a large proportion of the total communication.

  Therefore, when a conventional system is used as the indoor system, there is a problem that the number of MSs that can be actually connected is reduced with respect to the total number of channel resources of the BTS.

  In the technique described in Patent Document 1, the number of soft handover branches is controlled. However, it is necessary to change the processing on the system side to which the MS is connected.

  An object of the present invention is to provide a mobile communication system, a handover control method, a mobile station, and a program capable of suppressing the mobile station from consuming channel resources of a plurality of base stations due to soft handover.

  In the mobile communication system according to the present invention, the mobile station measures the received signal level from each base station and reports it to the base station controller, and the base station controller has a received signal level that is greater than a predetermined threshold. A mobile communication system that performs handover control by wirelessly connecting a base station and the mobile station, wherein the mobile station has a received signal level that is greater than the threshold value among received signal levels from the base stations. A value of a received signal level from a part of the base stations is reported as a value equal to or less than the threshold value.

  In another mobile communication system according to the present invention, a mobile station measures a received signal level from each base station and reports it to a base station controller, and the base station controller determines a received signal level greater than a predetermined threshold. A mobile communication system that performs handover control by wirelessly connecting the base station and the mobile station, the mobile station from a base station having a maximum level among received signal levels from the base stations Only the received signal level is reported.

  In the handover control method according to the present invention, a mobile station measures a received signal level from each base station and reports it to a base station controller, and the base station controller has a received signal level that is greater than a predetermined threshold. A handover control method of a mobile communication system for performing handover control by wirelessly connecting a base station and the mobile station, wherein the received signal level from each base station is greater than the threshold in the mobile station Reporting the received signal level value from some of the base stations having the received signal level as a value equal to or lower than the threshold value.

  In another handover control method according to the present invention, a mobile station measures a received signal level from each base station and reports it to a base station controller, and the base station controller determines a received signal level that is greater than a predetermined threshold. A handover control method of a mobile communication system for performing handover control by wirelessly connecting the base station and the mobile station, wherein the mobile station has a maximum level among received signal levels from the base stations. The method includes the step of reporting only the received signal level from the base station.

  In the mobile station according to the present invention, the mobile station measures the received signal level from each base station and reports it to the base station controller, and the base station controller has a received signal level that is greater than a predetermined threshold. A mobile station of a mobile communication system that performs handover control by wirelessly connecting a mobile station and the mobile station, wherein the base station has a received signal level that is greater than the threshold value among received signal levels from each base station Of the received signal level from some of the base stations is reported as a value equal to or lower than the threshold value.

  In another mobile station according to the present invention, the mobile station measures a received signal level from each base station and reports it to the base station controller, and the base station controller has a received signal level that is greater than a predetermined threshold. A mobile station of a mobile communication system that performs handover control by wirelessly connecting the base station and the mobile station, the received signal level from the base station having the maximum level among the received signal levels from each base station It is characterized by reporting only.

  In the program according to the present invention, a mobile station measures a received signal level from each base station and reports it to a base station controller, and the base station controller has a received signal level that is greater than a predetermined threshold. A program for causing a computer to execute an operation control method of a mobile station of a mobile communication system that performs handover control by wirelessly connecting the mobile station and the mobile station, wherein the threshold value among the received signal levels from each base station It includes a process of reporting values of received signal levels from some of the base stations having a received signal level that is greater than the threshold value.

  Another program according to the present invention is that the mobile station measures the received signal level from each base station and reports it to the base station controller, wherein the base station controller has a received signal level greater than a predetermined threshold. A program for causing a computer to execute an operation control method for a mobile station of a mobile communication system that performs handover control by wirelessly connecting a base station and the mobile station, of the received signal levels from the base stations It includes a process of reporting only the received signal level from the base station having the maximum level.

  When the mobile station measures the received signal level from each base station and reports it to the base station controller, if the received signal level other than the maximum value is greater than a predetermined threshold, the level is actually It is reported to the base station controller as a predetermined value not more than a threshold value instead of the measured value. Alternatively, the mobile station reports only the maximum received signal level from the base station to the base station controller.

  According to the present invention, the mobile station measures the received signal level from each base station and reports it to the base station controller, and the base station controller moves with the base station having a received signal level greater than a predetermined threshold. In a mobile communication system in which handover control is performed by wirelessly connecting a station, the mobile station is a base station having a received signal level greater than a threshold among received signal levels from each base station. Since the value of the received signal level from the station is reported as a value equal to or less than the threshold value, it is possible to suppress the mobile station from consuming channel resources of a plurality of base stations due to soft handover. .

  Embodiments of the present invention will be described below with reference to the drawings.

  In the CDMA mobile communication system according to the embodiment of the present invention, the configuration and operation on the system side to which the MS such as BTS and RNC is connected are the same as those in the conventional example described above with reference to FIGS. ing.

  FIG. 1 is a flowchart showing an operation of an MS in a CDMA mobile communication system according to an embodiment of the present invention. As shown in FIG. 1, the MS according to the embodiment of the present invention first measures the CPICH received power Pi from each BTS (step A1), and rearranges the measured CPICH received power values Pi from each BTS in descending order. (Step A2). Next, the MS compares the CPICH received power value Pi excluding the maximum value among the measured CPICH received power values Pi with a predetermined threshold value α (step A3), and depending on the result, step A4 or step Proceed to A5 respectively.

  Here, the threshold value α is called a handover threshold value, and soft handover (addition) processing is started from the RNC for a BTS in which the CPICH received power value from each BTS in the MS is larger than the handover threshold value α. Conversely, a soft handover (deletion) process is executed from the RNC for a BTS that is less than or equal to the handover threshold α. That is, the MS means a BTS with a CPICH received power value larger than α and a soft handover state.

  As a result of the comparison in step A3, for a BTS having a CPICH reception power value larger than α, the process proceeds to step A4, where α is set as a report value to the RNC instead of the actual measurement value as the CPICH reception power value from that BTS. On the other hand, for a BTS whose CPICH received power value is less than or equal to α, the process proceeds to step A5, where the actual measurement value is set as the report value to the RNC as the CPICH received power value from that BTS.

  Then, the MS uses the measured value of the CPICH reception power from the BTS which is the maximum value among the measured CPICH reception power values Pi, and the report values set in Steps A4 and A5 to the BTS currently connected to the MS. To the RNC (step A6). Note that the MS repeatedly executes the above steps A1 to A6 while connected to the BTS.

  Next, how the connection status with the BTS changes with the movement of the MS when the above embodiment is used will be described with reference to FIGS. In the following description, it is assumed that the MS 305 in FIG. 4 performs a processing operation according to the flowchart in FIG. FIG. 5C is a diagram showing the connection status between the MS 305 and the BTSs 301 and 302 when the flowchart of FIG. 1 is followed.

  Hereinafter, the connection status with the BTSs 301 and 302 when the MS 305 moves from the point A to the point E as shown in FIG. 4 will be described. First, it is assumed that the MS 305 is connected to the BTS 301 at the point A. At this time, as shown in FIG. 5A, since P (301, A) is sufficiently larger than α and P (302, A) is smaller than α, the MS 305 is not connected to the BTS 302 (FIG. 5C )reference). Note that the CPICH received power value of each BTS reported by the MS 305 at the point A to the RNC is P (301, A) and P (302, A), which are actual measured values, according to the processing of steps A3 and A5 in FIG. It becomes.

  Next, the point where the MS 305 moves toward the BTS 302 and P (302, B) becomes larger than α for the first time is defined as a point B. At this time, P (301, B) is assumed to be sufficiently larger than α. Here, the MS 305 determines that P (302, B) is larger than α in step A3 in FIG. 1, and in step A4 in FIG. 1, the reported value to the RNC for the BTS 302 is P (302, B) which is an actual measurement value. ), Not α. Also, since P (301, B), which is the CPICH received power value from BTS 301, is the maximum value, MS 305 sets P (301, B) as it is as a report value to RNC for BTS 301, and reports each of them. The value is reported to the RNC via the currently connected BTS 301 (step A6 in FIG. 1).

  On the other hand, the RNC that has received the report does not start the soft handover (addition) process for the BTS 302 because the CPICH received power value from the BTS 302 is reported as a value equal to or less than the handover threshold α. Therefore, at the point B, the state where the MS 305 is connected only to the BTS 301 is continued (see FIG. 5C).

  Next, consider a case where the MS 305 further moves toward the BTS 302 and reaches a point C where the magnitudes of P (301, C) and P (302, C) are reversed. However, both values are larger than α. Here, the maximum value of CPICH reception power from each BTS is not the CPICH reception power value from BTS 301 but the CPICH reception power value from BTS 302. Therefore, in step A3 of FIG. 1, P (301, C) becomes a comparison target with α, and as a result, α is set to the CPICH received power value from the BTS 301 to be reported to the RNC in step A4 of FIG. . Thus, the actual value P (302, C) of the CPICH received power from the BTS 302 and the α as the CPICH received power from the BTS 301 are reported to the RNC via the BTS 301 ( Step A6 in FIG.

  Receiving this report, the RNC recognizes that the CPICH received power value from the BTS 302 has exceeded the handover threshold α for the first time, and activates the soft handover (addition) process for the BTS 302 to start the connection with the MS 305. On the other hand, the CPICH received power value from the BTS 301 is recognized to be equal to or less than the handover threshold α, and the RNC activates a soft handover (deletion) process for the BTS 301. As a result, the BTS 301 is disconnected from the MS 305, and as a result, the MS 305 is connected only to the BTS 302 (see FIG. 5C).

  Next, consider a case where the MS 305 further moves toward the BTS 302 and reaches a point D where P (301, D) is less than or equal to α. As the operation in the MS 305 here, since P (301, D) is determined to be α or less in step A3 in FIG. 1, the reported value to the RNC for the BTS 301 in step A5 in FIG. 1 is an actual measurement value. P (301, D) is set. Also, since P (302, D) is sufficiently higher than α and is the maximum value of CPICH received power from each BTS, the MS 305 sets P (302, D) as it is as a report value to the RNC for the BTS 302. Then, the respective report values are reported to the RNC through the currently connected BTS 302 (step A6 in FIG. 1).

  The RNC that has received this report does not start the soft handover (addition) process for the BTS 301 because the report value P (301, D) to the RNC for the BTS 301 is α or less. Therefore, at the point D, the state where the MS 305 is connected only to the BTS 302 is continued (see FIG. 5C).

  Finally, consider a case where the MS 305 further approaches the BTS 302 and reaches a point E where P (302, E) is sufficiently larger than α and P (301, E) is smaller than α. . At this time, the MS 305 reports the RNC report value for each BTS to the RNC via the currently connected BTS 302 as the actual measurement values P (302, E) and P (301, E) as in the point D (FIG. 1). As a result, the RNC does not start the soft handover (addition) process for the BTS 301, and the MS 305 continues to be connected only to the BTS 302 (see FIG. 5C).

  As described above, according to the embodiment of the present invention, between the point A and the point C in FIG. 4, the MS 305 connects only with the BTS 301, and between the point C and the point E in FIG. Will only make a connection. As described above, in the embodiment of the present invention, when the MS 305 moves between the service areas 303 and 304 of the BTSs 301 and 302, in the conventional example, the MS 305 moves to an area where soft handover is executed between both of the BTSs 301 and 302. Even so, the connection with a single BTS can be continued (see FIGS. 5B and 5C). This makes it possible to avoid consuming multiple channel resources of a plurality of BTSs by one MS, and is advantageous when configuring a system with a small BTS with a small channel capacity used indoors. .

  Further, in the embodiment of the present invention, the above-described effects can be realized only by adding the MS processing without changing the basic operation of the BTS and RNC in the conventional example. Therefore, according to the system (indoor / outdoor etc.) to which the MS is connected, it is possible to easily cope with either the conventional method or the present embodiment.

  In step A4 in FIG. 1, the value reported to the RNC is replaced with the same value as the handover threshold value α, but this is not a limitation, and it is of course possible to use a value less than or equal to the threshold value α. is there. In the flowchart of FIG. 1, when the CPICH received power value is less than or equal to the threshold value α, the received power value (actually measured value) is used as it is as a report value to the RNC in step A5, but the value is replaced in the same manner as in step A4. It may be. That is, for the received power values other than the maximum value among the CPICH received power values from each BTS, the value reported to the RNC may be set to α.

  Next, another embodiment of the present invention will be described. FIG. 2 is a flowchart illustrating the operation of the MS according to another embodiment of the present invention. 2 is the same as steps A1 and A2 in FIG. 1, and therefore the description thereof is omitted.

  As shown in FIG. 2, after the processing of steps B1 and B2, the MS transmits only the CPICH reception power value from the BTS having the maximum reception power value among the CPICH reception power values from each BTS to the currently connected BTS. To the RNC (step B3). Note that the MS repeatedly executes the above steps B1 to B3 while connected to the BTS.

  Thus, in another embodiment of the present invention, the MS reports only the maximum received power value to the RNC, so that only the BTS that is transmitting the CPICH of the maximum received power value is the MS. And control to make a wireless connection. Therefore, even when the MS 305 in FIG. 4 performs the processing operation according to the flowchart in FIG. 2 and moves from the point A to the point E, the MS 305 is between the point A and the point C as in the case of FIG. It is obvious that the MS 305 is connected only to the BTS 302 between the point C and the point E, and the same effect as in the case of FIG. 1 can be obtained.

  The processing operations according to the flowcharts shown in FIGS. 1 and 2 are realized by causing a computer, which is a CPU (control unit), to read and execute a program stored in a storage medium such as a ROM in advance. Of course you can.

3 is a flowchart illustrating an operation of an MS according to an embodiment of the present invention. 6 is a flowchart illustrating an operation of an MS according to another embodiment of the present invention. It is a flowchart which shows operation | movement of conventional MS. It is a system block diagram which shows a mode that MS moves between service areas. (A) is a figure which shows the change of the reception power value of CPICH transmitted from each BTS when MS moves between service areas in FIG. 4, (b) is MS at the time of following the flowchart of FIG. And (c) is a diagram showing the connection status between the MS and each BTS when the flowchart of FIG. 1 is followed.

Explanation of symbols

301,302 BTS
303,304 Service area
305 MS
311 RNC

Claims (11)

The mobile station measures the received signal level from each base station and reports it to the base station controller, and the base station controller has the received signal level greater than a predetermined threshold value and the mobile station. A mobile communication system that performs handover control by wireless connection,
The mobile station sets a value of a received signal level from a part of the base stations having a received signal level larger than the threshold value among received signal levels from the respective base stations to a value equal to or less than the threshold value. A mobile communication system characterized by being reported as   The some of the base stations are base stations having a received signal level that is greater than the threshold value, excluding a base station having a maximum level among received signal levels from the respective base stations. The mobile communication system according to 1. The mobile station measures the received signal level from each base station and reports it to the base station controller, and the base station controller has the received signal level greater than a predetermined threshold value and the mobile station. A mobile communication system that performs handover control by wireless connection,
The mobile communication system, wherein the mobile station reports only a received signal level from a base station having a maximum level among received signal levels from the respective base stations. The mobile station measures the received signal level from each base station and reports it to the base station controller, and the base station controller has the received signal level greater than a predetermined threshold value and the mobile station. A handover control method of a mobile communication system that performs handover control by wireless connection,
In the mobile station, the value of the received signal level from a part of the base stations having the received signal level that is higher than the threshold value among the received signal levels from the respective base stations is a value equal to or lower than the threshold value. A handover control method comprising the step of reporting as:   The some of the base stations are base stations having a received signal level that is greater than the threshold value, excluding a base station having a maximum level among received signal levels from the respective base stations. 4. The handover control method according to 4. The mobile station measures the received signal level from each base station and reports it to the base station controller, and the base station controller has the received signal level greater than a predetermined threshold value and the mobile station. A handover control method of a mobile communication system that performs handover control by wireless connection,
The handover control method comprising the step of reporting only the received signal level from the base station having the maximum level among the received signal levels from the respective base stations in the mobile station. The mobile station measures the received signal level from each base station and reports it to the base station controller, and the base station controller has the received signal level greater than a predetermined threshold and the mobile station. A mobile station of a mobile communication system that performs handover control by wireless connection,
Report the value of the received signal level from some of the base stations having the received signal level greater than the threshold among the received signal levels from each of the base stations as a value equal to or lower than the threshold. A mobile station characterized by that.   The some of the base stations are base stations having a received signal level that is greater than the threshold value, excluding a base station having a maximum level among received signal levels from the respective base stations. 7. The mobile station according to 7. The mobile station measures the received signal level from each base station and reports it to the base station controller, and the base station controller has the received signal level greater than a predetermined threshold value and the mobile station. A mobile station of a mobile communication system that performs handover control by wireless connection,
Only the received signal level from the base station having the maximum level among the received signal levels from the respective base stations is reported. The mobile station measures the received signal level from each base station and reports it to the base station controller, and the base station controller has the received signal level greater than a predetermined threshold value and the mobile station. A program for causing a computer to execute an operation control method of a mobile station of a mobile communication system that performs handover control by wireless connection,
A process of reporting a value of a received signal level from some of the base stations having a received signal level greater than the threshold value among the received signal levels from each base station as a value equal to or lower than the threshold value; A program characterized by including. The mobile station measures the received signal level from each base station and reports it to the base station controller, and the base station controller has the received signal level greater than a predetermined threshold value and the mobile station. A program for causing a computer to execute an operation control method of a mobile station of a mobile communication system that performs handover control by wireless connection,
The program characterized by including the process which reports only the received signal level from the base station which has the maximum level among the received signal levels from each said base station.

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