JP2005311626A - Control station device and handover method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control station device capable of reducing a control load when executing the diversity handover, and also, capable of surely connecting a mobile station with a base station which can satisfy prescribed communication quality. <P>SOLUTION: A moving speed detector 104 detects the moving speed of the mobile station by a received signal. An HO control parameter determining part 105 variably sets a handover control parameter on the basis of the moving speed of a terminal device. A connection determining part 106 notifies the mobile station by selecting a base station device, to which the mobile station is connected, on the basis of the handover control parameter set by the HO control parameter determining part 105 and a Measurement Report informed from the mobile station in prescribed periods. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a control station apparatus and a handover method, and for example, relates to a control station apparatus and a handover method for switching a mobile station to select a plurality of base stations as they move and perform communication.

  Handover control (hereinafter referred to as “HO control”) is one of the characteristic radio link controls in a CDMA system. With this HO control, in a predetermined area near the boundary between cells or sectors, a mobile station (MS) performs communication by simultaneously setting a plurality of cells or sectors and a plurality of communication channels. As a result, the maximum ratio combining or selective combining of a plurality of received signals in the uplink or downlink provides effects such as communication stabilization, no instantaneous interruption, and capacity increase. In such HO control, what performs diversity handover between a mobile station and a plurality of base stations is known (for example, Patent Document 1).

  FIG. 18 shows a conventional diversity handover method. From FIG. 18, based on the communication quality between the base stations 10-1, 10-2, 10-3, 10-4 and the mobile station 11, when the communication quality level is L1, the number of diversity connections is 1. When the communication quality level is L2, the number of diversity connections is set to 2, and when the communication quality level is low, the number of diversity connections is increased. The control station 12 controls the base stations 10-1, 10-2, 10-3, and 10-4 corresponding to the number of diversity connections, and performs communication with the mobile station 11.

  Diversity handover is performed based on the HO control algorithm. FIG. 19 shows a HO control algorithm. In the HO control algorithm, AS (Active Set) is updated after each Event is activated. Then, the wireless link between the mobile station and the base station (BS) is added and deleted by updating the AS. A control method for each event will be described with reference to FIG. FIG. 19 shows an image of a window and an event when a transmission signal is transmitted from the base stations 1 to 4 using P-CPICH, which is one of the common control channels. In FIG. 19, the horizontal axis represents time, and the vertical axis represents the power level.

  In Event1A, when P-CPICH # 20 of base station 3 which is Non-Active enters in Addition Window # 21 which is a threshold value for determining activation of Event1A, Event1A is activated and base station 3 is set to AS. to add.

  In the event 1B, if the P-CPICH # 22 of the active base station 1 is outside the drop window # 23, which is a threshold value for determining the activation of the event 1B, the event 1B is activated and the base station 1 is moved from the AS. delete.

  Further, in the event 1C, when the AS is the maximum number, the base station 2 having the lowest P-CPICH level among the non-active base stations 4 and the active base station 4 has the lowest P-CPICH level. When the difference from P-CPICH # 25 exceeds the value of Replacement Window # 26, which is a threshold value for determining the activation of Event1C, Event1C is activated, and Non-Active base station 4 is added to AS Then, the base station 2 that is active deletes from the AS and switches to Non-Active.

Here, Addition Window # 21 and Drop Window # 23 indicate the power level difference between the cell or sector having the maximum signal level in the AS and a predetermined threshold value # 27. Addition Window # 21 and Drop Window # 23 are derived from Reporting range and Hysteresis, which are HO control parameters. For example, Addition Window # 21 can be obtained from RH / 2 (where R is reporting range, H is hysteresis), and Drop Window # 23 is R + H / 2 (where R is reporting range, H is (Hysteresis). The replacement window # 26 can be obtained from H / 2 (where H is a hysteresis). Accordingly, when H is 0, both Addition Window # 21 and Drop Window # 23 have the same width as shown in FIG. Further, when starting an event, the event is not started unless it is always within the window width of each event within the period set by the time to trigger which is the HO control parameter. Thereby, the processing load due to frequent activation can be reduced.
JP 2001-238239 A

  However, in the conventional control station apparatus and handover method, the power level of the base station reported from the mobile station enters the window, and the power level of the base station is within the window within the period set by Time to trigger. If so, Event is always activated. As a result, the event is activated for the base station that is not actually selected due to the limitation of the number of base station connections. For example, when the number of base station connections is limited to 2 and two base stations have already been selected, the third base station that cannot be selected is included in the window. Event is activated even though the third base station cannot be selected. In such a case, there are problems that wasteful control is performed and the control load cannot be reduced.

  In addition, in the conventional control station apparatus and handover method, when selecting the number of base station connections, if the communication quality level is low, the mobile station is assumed to be communicating with the base station at the cell edge. There is a problem in that only the number of stations connected is changed, and the communication environment around the mobile station and the use state of the mobile station are not considered. Therefore, in the conventional control station apparatus and handover method, there is a problem that the mobile station may be connected to a base station that cannot obtain sufficient quality at the time of diversity handover.

  The present invention has been made in view of such a point, and when performing diversity handover, the control load can be reduced, and the mobile station can be reliably connected to a base station that can satisfy a predetermined communication quality. An object of the present invention is to provide a control station apparatus and a handover method that can be used.

  The control station apparatus of the present invention includes a setting unit that variably sets a range of received power in the terminal apparatus that can be received by the terminal apparatus with a predetermined quality based on a communication environment, and each base station apparatus in the terminal apparatus A connection determination unit that selects the base station device whose received power is within the range of the reception power set by the setting unit, and the base station selected by the connection determination unit for the terminal device An instruction means for instructing connection with the apparatus is employed.

  According to this configuration, since the range of received power in the terminal device that can be received by the terminal device with predetermined quality is variably set based on the communication environment, the base station device included in the range of received power is set in the communication environment. Can be changed according to. As a result, the base station device to be connected or deleted is always selected when the process of connecting or deleting the base station device is started, so that the control load is reduced without performing unnecessary control at the time of diversity handover. In addition, the mobile station can reliably connect to a base station that can satisfy a predetermined communication quality.

  The control station apparatus according to the present invention employs a configuration in which, in the configuration, the setting unit decreases the range of the received power as the moving speed of the terminal device indicating the communication environment increases.

  According to this configuration, in addition to the above effects, the base station apparatus is selected according to the moving speed of the terminal apparatus. For example, when the propagation fluctuation is large due to the high moving speed of the terminal apparatus, the range of the received power is set. By reducing the number, the number of base station devices to be connected is reduced, and when the propagation fluctuation is small because the moving speed of the terminal device is slow, the number of base station devices to be connected is increased by increasing the range of received power. Thereby, it is possible to connect to the optimum number of optimum base station apparatuses according to the communication environment.

  The control station apparatus according to the present invention has a configuration in which, in the configuration, the setting unit decreases the range of the received power as the number of paths whose reception level in the delay profile indicating the communication environment is equal to or greater than a threshold increases. take.

  According to this configuration, in addition to the above effects, the base station apparatus is selected according to the number of paths. For example, when multipath interference is large, the base station apparatus to be connected by reducing the range of received power When the multipath interference is small, the range of received power is increased to increase the number of base station devices to be connected. Thereby, it is possible to connect to the optimum number of optimum base station apparatuses according to the communication environment.

  The control station apparatus according to the present invention employs a configuration in which, in the configuration, the setting unit decreases the range of the received power as the power resource of the base station apparatus indicating the communication environment decreases.

  According to this configuration, in addition to the above effects, the base station apparatus is selected according to the power resource. For example, when the power resource is small, the base station apparatus to be connected is reduced by reducing the range of the received power. When the power resource is large, the base station apparatus to be connected is increased by increasing the range of received power. Thereby, an electric power resource can be used effectively.

  The control station apparatus according to the present invention employs a configuration in which, in the configuration, the setting unit decreases the range of the received power as the communication quality indicating the communication environment becomes better.

  According to this configuration, in addition to the above effects, the base station apparatus is selected according to the communication quality. For example, when the communication quality deteriorates, the range of received power is increased to increase the number of connection target base station apparatuses. If the communication quality is good, the range of received power is reduced to reduce the number of base station devices to be connected. Thereby, it is possible to connect to the optimum number of optimum base station apparatuses according to the communication environment.

  The control station apparatus according to the present invention employs a configuration in which the setting means increases the range of the received power as the propagation loss indicating the communication environment increases.

  According to this configuration, in addition to the above-described effect, the communication environment such as the city or the countryside can be estimated from the propagation loss, for example, so that the range of received power can be set in a city with many high-rise buildings such as buildings. The number of base station devices to be connected is increased so that the number of base station devices to be connected is increased. In the countryside where there are few high-rise buildings such as buildings, the range of received power is reduced to reduce the number of base station devices to be connected. Thereby, it is possible to connect to the optimum number of optimum base station apparatuses according to the communication environment.

  In the control station apparatus according to the present invention, in the configuration described above, the setting unit is a city selected from a plurality of modes provided step by step from the city to the countryside by the user at an arbitrary timing. A configuration is adopted in which the range of the received power is increased.

  According to this configuration, in addition to the above effects, the user of the terminal device determines the communication environment and selects the mode, so that it is possible to flexibly cope with changes in the communication environment.

  The control station apparatus of the present invention includes a setting unit that variably sets a time interval in which received power information, which is received power information for each base station apparatus in the terminal apparatus, is reported from the terminal apparatus based on a communication environment; Connection determination means for selecting a base station device in which the received power of the received power information reported at the time interval is within a range that can be received by the terminal device with a predetermined quality; and An instruction means for instructing connection with the base station apparatus selected by the connection determination means is adopted.

  According to this configuration, since the time interval at which the received power information that is the received power information for each base station device in the terminal device is reported from the terminal device is variably set based on the communication environment, the received power information is The timing of the process for determining whether or not to select a base station apparatus each time it is received can be controlled according to the communication environment. As a result, it is possible to reduce control load without performing unnecessary control when performing diversity handover, and it is possible for the mobile station to reliably connect to a base station that can satisfy a predetermined communication quality.

  The control station apparatus according to the present invention employs a configuration in which, in the configuration, the setting unit increases the time interval as the moving speed of the terminal device indicating the communication environment increases.

  According to this configuration, in addition to the above-described effects, the base station apparatus is selected according to the moving speed of the terminal apparatus. Therefore, for example, when the movement speed of the terminal apparatus is fast and the propagation fluctuation is large, the time interval is increased. Accordingly, it is possible to reduce the processing load by reducing the number of times of determining whether or not to select a base station apparatus.

  The control station apparatus according to the present invention employs a configuration in which, in the configuration, the setting unit decreases the time interval as the number of paths whose reception level in the delay profile indicating the communication environment is equal to or greater than a threshold increases.

  According to this configuration, in addition to the above effects, the base station apparatus is selected according to the number of paths. For example, when multipath interference is large, the time interval for receiving the received power information is reduced, The base station apparatus can be immediately selected by increasing the number of times of determining whether to select the base station apparatus performed for each report. Thereby, it is possible to connect to the optimum number of optimum base station apparatuses according to the communication environment.

  The control station apparatus according to the present invention employs a configuration in which, in the configuration, the setting unit decreases the time interval as the power resource of the base station apparatus indicating the communication environment decreases.

  According to this configuration, in addition to the above effects, the base station apparatus is selected according to the power resource. For example, when the power resource is small, the time interval for receiving the received power information is reduced, The base station apparatus can be immediately selected by increasing the number of times to determine whether or not to select the base station apparatus. Thereby, when the power resource is small, it is possible to efficiently connect with the minimum number of base station apparatuses.

  The control station apparatus according to the present invention employs a configuration in which, in the configuration, the setting unit increases the time interval as the communication quality indicating the communication environment becomes better.

  According to this configuration, in addition to the above effects, the base station apparatus is selected according to the communication quality. For example, when the communication quality deteriorates, the time interval for receiving the received power information is reduced, and the report is made. Increase the number of times to determine whether or not to select a base station device every time, increase the number of base station devices to be connected, and report the received power information when the communication quality is good The number of base station apparatuses to be connected is reduced by increasing the time interval to be received and reducing the number of processes for determining whether or not to select a base station apparatus performed for each report. Thereby, it is possible to connect to the optimum number of optimum base station apparatuses according to the communication environment.

  The control station apparatus according to the present invention employs a configuration in which, in the configuration, the setting unit decreases the time interval as the propagation loss indicating the communication environment increases.

  According to this configuration, in addition to the above effects, for example, it is possible to estimate the communication environment such as the city or the countryside from the propagation loss. Therefore, when the city has many high-rise buildings such as buildings, the received power information is reported. The number of base station devices to be connected is increased by increasing the number of processes for determining whether or not to select a base station device to be performed for each report by reducing the time interval to be received, such as a building If the countryside has few high-rise buildings, increase the time interval for receiving the received power information and reduce the number of times to determine whether to select a base station device for each report. This reduces the number of base station devices to be connected. Thereby, it is possible to connect to the optimum number of optimum base station apparatuses according to the communication environment.

  In the control station apparatus according to the present invention, in the configuration described above, the setting unit decreases the time interval as the mode selected by the user at an arbitrary timing is a city among a plurality of modes from the city to the countryside. The structure to do is taken.

  According to this configuration, in addition to the above effects, the user of the terminal device determines the communication environment and selects the mode, so that it is possible to flexibly cope with changes in the communication environment.

  The control station apparatus according to the present invention includes a setting unit that variably sets a duration for comparison with a time at which a received signal at a terminal device continuously satisfies a predetermined quality, based on a communication environment, and a received signal at the terminal device Connection determination means for selecting the base station apparatus that continuously satisfies a predetermined quality for the duration or longer, and connection between the terminal station apparatus and the base station apparatus selected by the connection determination means And an instruction means for instructing.

  According to this configuration, since the duration time for which the received signal in the terminal device continues and satisfies the predetermined quality is variably set based on the communication environment, until it is decided to select the base station device The time can be changed according to the communication environment. As a result, since a base station device that does not need to be selected is not inadvertently selected, control load can be reduced without performing unnecessary control when performing diversity handover, and a mobile station Can reliably connect to a base station that can satisfy a predetermined communication quality.

  The control station apparatus according to the present invention employs a configuration in which, in the configuration, the setting unit increases the duration as the moving speed of the terminal device indicating the communication environment increases.

  According to this configuration, in addition to the above-described effects, the base station apparatus is selected according to the moving speed of the terminal apparatus. Therefore, for example, when the fluctuation in propagation is large due to the high moving speed of the terminal apparatus, the duration is increased. Accordingly, it is possible to reduce the processing load by reducing the number of processes for selecting the base station apparatus.

  The control station apparatus according to the present invention employs a configuration in which, in the configuration, the setting unit decreases the duration as the number of paths whose reception level in the delay profile indicating the communication environment is equal to or greater than a threshold value increases.

  According to this configuration, in addition to the above-described effects, the base station apparatus is selected according to the number of paths. For example, when multipath interference is large, the duration time for determining whether to select the base station apparatus is set. By reducing the size, the base station device can be selected immediately. Thereby, it is possible to connect to the optimum number of optimum base station apparatuses according to the communication environment.

  The control station apparatus according to the present invention employs a configuration in which, in the configuration, the setting unit decreases the duration as the power resource of the base station apparatus indicating the communication environment decreases.

  According to this configuration, in addition to the above effects, the base station apparatus is selected according to the power resource. For example, when the power resource is small, the duration time for determining whether to select the base station apparatus is reduced. Thus, the base station apparatus can be selected immediately. Thereby, when the power resource is small, it is possible to efficiently connect with the minimum number of base station apparatuses.

  The control station apparatus according to the present invention employs a configuration in which, in the configuration, the setting means increases the duration as communication quality indicating the communication environment becomes better.

  According to this configuration, in addition to the above effects, the base station apparatus is selected according to the communication quality. For example, when the communication quality deteriorates, the duration time for determining whether to select the base station apparatus is reduced. By doing so, the base station apparatus can be selected immediately. Thereby, it is possible to connect to the optimum number of optimum base station apparatuses according to the communication environment.

  The control station apparatus according to the present invention employs a configuration in which, in the above configuration, the setting means increases the duration as the propagation loss indicating the communication environment increases.

  According to this configuration, in addition to the above-described effect, for example, a communication environment such as a city or countryside can be estimated from propagation loss. Therefore, if the city has many high-rise buildings such as buildings, a base station device is selected. By increasing the continuation time for determining whether to perform or not, the number of processes for selecting a base station apparatus is reduced, thereby reducing the processing load. Thereby, the processing load can be controlled according to the communication environment.

  In the control station apparatus according to the present invention, in the configuration described above, the setting unit increases the duration as the mode selected by the user at an arbitrary timing is a city among a plurality of modes from the city to the countryside. The structure to do is taken.

  According to this configuration, in addition to the above effects, the user of the terminal device determines the communication environment and selects the mode, so that it is possible to flexibly cope with changes in the communication environment.

  The handover method of the present invention includes a step of variably setting a range of received power in the terminal device that the terminal device can receive with a predetermined quality based on a communication environment, and reception of each base station device in the terminal device A step of selecting the base station device whose power is within the range; and a step of instructing the terminal device to connect to the selected base station device.

  According to this method, since the range of received power in the terminal device that can be received by the terminal device with a predetermined quality is variably set based on the communication environment, the base station device included in the range of received power is set in the communication environment. Can be changed according to. As a result, the base station device to be connected or deleted is always selected when the process of connecting or deleting the base station device is started, so that the control load is reduced without performing unnecessary control at the time of diversity handover. In addition, the mobile station can reliably connect to a base station that can satisfy a predetermined communication quality.

  The handover method of the present invention includes a step of variably setting a time interval based on a communication environment in which received power information, which is received power information for each base station device in a terminal device, is reported from the terminal device; Selecting a base station device in which the received power of the received power information reported at a time interval is in a range that can be received at a predetermined quality by the terminal device; and the selected terminal device And a step of instructing a connection with the base station apparatus.

  According to this method, since the time interval for receiving the received power information, which is the received power information for each base station device in the terminal device, is variably set based on the communication environment, the received power information is The timing of the process for determining whether or not to select a base station apparatus each time it is received can be controlled according to the communication environment. As a result, it is possible to reduce control load without performing unnecessary control when performing diversity handover, and it is possible for the mobile station to reliably connect to a base station that can satisfy a predetermined communication quality.

  According to the handover method of the present invention, the step of variably setting a continuation time for comparing the time at which the received signal at the terminal device continuously satisfies the predetermined quality based on the communication environment, and the received signal at the terminal device Selecting the base station apparatus that continuously satisfies a predetermined quality for the duration time or longer, and instructing the terminal apparatus to connect to the selected base station apparatus. I did it.

  According to this method, since the duration time for which the received signal at the terminal device continues and satisfies the predetermined quality is variably set based on the communication environment, until it is decided to select the base station device The time can be changed according to the communication environment. As a result, since a base station device that does not need to be selected is not inadvertently selected, control load can be reduced without performing unnecessary control when performing diversity handover, and a mobile station Can reliably connect to a base station that can satisfy a predetermined communication quality.

  According to the present invention, when performing diversity handover, the control load can be reduced and the mobile station can be reliably connected to a base station that can satisfy a predetermined communication quality.

  The essence of the present invention is the received power range (for example, Addition Window or Drop Window) in the terminal device that can be received by the terminal device with a predetermined quality, and the received power that is received power information for each base station device in the terminal device. Based on the communication environment, a time interval (for example, HO interval) in which information is reported from the terminal device or a time period (for example, Time to trigger) in which the received signal in the terminal device continuously satisfies a predetermined quality is compared. In other words, the base station apparatus selects the base station apparatus in which the reception power for each base station apparatus in the terminal apparatus is continuously within the set range for the duration or longer.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a block diagram showing configurations of base station apparatus 108 and control station apparatus 109 according to Embodiment 1 of the present invention. The antenna 101, duplexer 102, reception / demodulation unit 103, movement speed detection unit 104, and transmission / modulation unit 107 constitute a base station apparatus 108. The HO control parameter determination unit 105 and the connection determination unit 106 constitute a control station device 109. Note that the control station device 109 is an upper station of the base station device 108. Further, the control station device 109 is connected to a plurality of base station devices 108 having the same configuration, but for convenience of explanation, only one base station device 108 is shown in FIG. Description is omitted.

  The duplexer 102 outputs the reception signal received by the antenna 101 to the reception / demodulation unit 103 and transmits the transmission signal input from the transmission / modulation unit 107 from the antenna 101.

  The reception / demodulation unit 103 down-converts the reception signal input from the duplexer 102 from a radio frequency to a baseband frequency, and demodulates and outputs the demodulated signal to the moving speed detection unit 104. Reception / demodulation section 103 demodulates the down-converted received signal and outputs it as received data.

  The movement speed detection unit 104 detects the movement speed of the mobile station from the received signal input from the reception / demodulation unit 103, and outputs movement speed information that is information on the detected movement speed to the HO control parameter determination unit 105.

  The HO control parameter determination unit 105 that is a setting unit sets HO control parameters based on movement speed information indicating the communication environment input from the movement speed detection unit 104, and HO control parameter information that is information on the set HO control parameters. Is output to the connection determination unit 106. Here, the HO control parameters are HO interval, Reporting Range, Hysteresis, Time to trigger, and the like. A method for setting the HO control parameter will be described later.

  The connection determination unit 106 generates a control command for connection addition or connection deletion based on the Measurement Report included in the reception data input from the reception / demodulation unit 103 and the HO control parameter information input from the HO control parameter determination unit 105. . Connection determination unit 106 then outputs the generated control command to transmission / modulation unit 107.

  The transmission / modulation unit 107 modulates the transmission data including the control command input from the connection determination unit 106 to generate a modulation signal, and upconverts the generated modulation signal from the baseband frequency to the radio frequency to the duplexer 102. Output.

  Next, the configuration of the mobile station will be described with reference to FIG. FIG. 2 is a block diagram showing a configuration of mobile station 200 that is a terminal device.

  Duplexer 202 outputs a reception signal received by antenna 201 to reception / demodulation section 203 and transmits a transmission signal input from transmission / modulation section 207 from antenna 201.

  The reception / demodulation unit 203 down-converts the reception signal input from the duplexer 202 from a radio frequency to a baseband frequency, demodulates it, and outputs the demodulated signal to the level measurement unit 204, the HO determination unit 205, and the connection control unit 206. The reception / demodulation unit 203 demodulates the down-converted reception signal and outputs it as reception data.

  The level measurement unit 204 measures the reception level from, for example, the received signal of the common control channel input from the reception / demodulation unit 203, and outputs reception level information that is information on the measured reception level to the HO determination unit 205.

  The HO determination unit 205 determines whether to start the event based on the HO control parameter information included in the reception data input from the reception / demodulation unit 203 and the reception level information input from the level measurement unit 204. If the HO determination unit 205 determines to start the event, the HO determination unit 205 outputs the reception level information input from the level measurement unit 204 to the transmission / modulation unit 207 as a measurement report regardless of the set cycle. Further, the HO determination unit 205 sets a cycle for transmitting the measurement report based on the HO control parameter information included in the reception data input from the reception / demodulation unit 203. Then, the HO determination unit 205 outputs the reception level information input from the level measurement unit 204 at a set cycle to the transmission / modulation unit 207 as a Measurement Report.

  The connection control unit 206 outputs to the transmission / modulation unit 207 a control signal for starting communication with the base station apparatus 108 instructed to connect with reference to a control command included in the reception data input from the reception / demodulation unit 203 To do.

  The transmission / modulation unit 207 generates a modulation signal by modulating the transmission data including the information of the measurement report input from the HO determination unit 205 and the control signal input from the connection control unit 206, and generates the modulated signal as a baseband. Up-convert from frequency to radio frequency and output to duplexer 202. When the connection control unit 206 controls the transmission / modulation unit 207 to add the base station device 108, the transmission / modulation unit 207 adds the base station device to start communication with the added base station device 108. If the base station device 108 is controlled to be deleted by the connection control unit 206, the frequency of the base station device 108 is deleted in order to cancel communication with the base station device 108 to be deleted. Cancel the frequency setting.

  Next, operations of base station apparatus 108, control station apparatus 109, and mobile station 200 will be described. First, when the control station apparatus 109 has one function in the operation of selecting the base station apparatus 108 and the mobile station 200 is connected to the base station apparatus 108-1, a new base station apparatus 108 is provided. -2 will be described with reference to FIGS. 3 to 6 when the base station apparatus 108-2 is added. FIG. 3 is a schematic diagram showing the relationship between the base station apparatuses 108-1 and 108-2, the control station apparatus 109 and the mobile station 200. FIG. 4 is a schematic diagram of the base station apparatus 108, the control station apparatus 109 and the mobile station 200. FIG. 5 is a diagram illustrating HO control parameter setting information in which a moving speed and an HO control parameter are associated with each other. FIG. 6 is a reception level of each base station apparatus in the mobile station 200. It is a figure which shows time transition of. It is assumed that the control station apparatus 109 can select a maximum of three base station apparatuses from among the four base station apparatuses (the maximum of AS is 3). 3 and 4, only two base station apparatuses 108-1 and 108-2 are shown, and descriptions of the other two base station apparatuses are omitted.

  First, reception level information, which is information on the reception level measured by the level measurement unit 204 of the mobile station 200, is transmitted as a Measurement Report to the base station apparatus 108-1 at a predetermined period based on the HO control parameter information. (Step ST401). That is, in FIG. 6, the mobile station 200 periodically transmits a measurement report at time t1, time t6, and time t9. Further, the mobile station 200 transmits a measurement report when each event is activated, in addition to the measurement report that is periodically transmitted.

  Next, base station apparatus 108-1 outputs the received Measurement Report to control station apparatus 109 (step ST402).

  Next, the moving speed detection unit 104 of the base station apparatus 108-1 detects the moving speed of the mobile station 200, and reports the detection result to the control station apparatus 109.

  Next, based on the moving speed information of the mobile station 200 reported from the base station apparatus 108-1 at the HO control parameter determination unit 105, the control station apparatus 109 displays the HO control parameter determination unit 105 as shown in FIG. 5. HO control parameters such as Reporting Range, Hysteresis, and Time to trigger are set by referring to HO control parameter setting information that associates the moving speed with the HO control parameter.

  After setting the conditions for starting each Event in this way, for example, as shown in FIG. 6, at time t2, the power level of the base station apparatus 108-2 using P-CPICH3 becomes equal to or higher than Reporting Range. As a result, the control station device 109 starts measuring Time to trigger from time t2 to time t4. However, since the power level of the mobile station 200 becomes equal to or lower than the reporting range at the time t3 before the time t4, the base station device 108-2 does not activate the Event 1A at this time.

  Then, again at time t5, when the power level of the base station device 108-2 becomes equal to or higher than Reporting Range, the control station device 109 starts measuring Time to trigger from time t5 to time t7. Then, since the power level of the mobile station 200 never falls below the reporting range between the time t5 and the time t7, the connection determination unit 106 transmits the measurement report and activates the Event 1A at the time t7. Base station apparatus 108-2 is selected as the base station apparatus to be added.

  Next, the control station apparatus 109 outputs a Radio Link Addition Request that requests the base station apparatus 108-2 selected by the connection determination unit 106 to connect to the mobile station 200 (step ST403).

  Next, base station apparatus 108-2 returns Radio Link Addition Response, which is an answer as to whether or not connection with mobile station 200 is possible, to control station apparatus 109 (step ST404).

  Next, when the radio link addition response returned from the base station apparatus 108-2 is a response indicating that the mobile station 200 can be connected, the control station apparatus 109 adds a control signal for adding the base station apparatus 108-2. Active Set Update is output to base station apparatus 108-1 (step ST405).

  Next, base station apparatus 108-1 transmits Active Set Update, which is a control signal for adding connection to base station apparatus 108-2, to mobile station 200 (step ST406).

  Next, the mobile station 200 outputs an Active Set Update Complete, which is a signal for which the process of adding the base station apparatus 108-2 as a connection target is completed from the connection control unit 206, so that the base station apparatus 108 is transmitted from the mobile station 200. Active Set Update Complete is transmitted to −1 (step ST407).

  Next, base station apparatus 108-1 transmits Active Set Update Complete, which is a signal for which processing for adding base station apparatus 108-2 as a connection target is completed, to control station apparatus 109 (step ST408).

  Next, the control station apparatus 109 has one function in the operation of selecting the base station apparatus 108, and the mobile station 200 is connected to the base station apparatus 108-1 and the base station apparatus 108-2. The operation when the base station device 108-2 is deleted by canceling the connection with the base station device 108-2 will be described with reference to FIGS. FIG. 7 is a sequence diagram showing operations of base station apparatus 108, control station apparatus 109, and mobile station 200. It is assumed that the control station apparatus 109 can select a maximum of three base station apparatuses from among the four base station apparatuses (the maximum of AS is 3).

  First, reception level information, which is information on the reception level measured by the level measurement unit 204 of the mobile station 200, is transmitted as a measurement report to the base station apparatus 108-1 (step ST701). That is, in FIG. 6, the mobile station 200 periodically transmits a measurement report at time t1, time t6, and time t9. Further, the mobile station 200 transmits a measurement report when each event is activated, in addition to the measurement report that is periodically transmitted.

  Next, base station apparatus 108-1 outputs the received Measurement Report to control station apparatus 109 (step ST702).

  Next, the moving speed detection unit 104 of the base station apparatus 108-1 detects the moving speed of the mobile station 200, and reports the detection result to the control station apparatus 109.

  Next, based on the moving speed information of the mobile station 200 reported from each base station apparatus in the HO control parameter determining unit 105, the control station apparatus 109 uses the moving speed shown in FIG. HO control parameters such as Reporting Range, Hysteresis, Time to trigger, and the like are set by referring to HO control parameter setting information that associates the HO control parameters with each other.

  After setting the conditions for starting each Event in this way, for example, as shown in FIG. 6, at time t8, the power level of the base station apparatus 108-2 using P-CPICH3 becomes less than Reporting Range. As a result, the control station device 109 starts measuring Time to trigger from time t8 to time t10. Then, since the power level of the mobile station 200 never exceeds the reporting range between the time t8 and the time t10, the connection determination unit 106 transmits the measurement report and activates the Event1B at the time t10, so that the connection determination unit 106 is connected. Base station apparatus 108-2 is selected as the base station apparatus to be deleted. In addition, when the power level becomes equal to or higher than Reporting Range between time t8 and time t10, base station apparatus 108-2 is not selected as the base station apparatus to be deleted.

  Next, the control station device 109 sends an active set update, which is a control signal for releasing the connection with the base station device 108-2 selected as the deletion target by the connection determination unit 106, to the base station device 108-1. Output (step ST703).

  Next, base station apparatus 108-1 transmits, to mobile station 200, Active Set Update, which is a control signal for releasing connection with base station apparatus 108-2 (step ST704).

  Next, the mobile station 200 outputs, from the mobile station 200, the base station apparatus 108 by outputting an Active Set Update Complete signal that is a signal for which the process of deleting the base station apparatus 108-2 as a deletion target is completed from the connection control unit 206. Active Set Update Complete is transmitted to -1. (Step ST705).

  Next, base station apparatus 108-1 outputs, to control station apparatus 109, Active Set Update Complete, which is a signal for which processing for deleting base station apparatus 108-2 as a deletion target in mobile station 200 has been completed ( Step ST706).

  Next, control station apparatus 109 outputs a radio link deletion request for requesting base station apparatus 108-2 selected by connection determination section 106 to release connection with mobile station 200 (step ST707). ).

  Next, base station apparatus 108-2 returns Radio Link Delete Response, which is an answer as to whether connection with mobile station 200 can be released, to control station apparatus 109 (step ST708).

  Next, when the control station apparatus has two functions in the operation of selecting the base station apparatuses 108-1 and 108-2 and when the mobile station 200 is connected to the base station apparatus 108-1, Next, the operation when the base station apparatus 108-2 is added by connecting to the base station apparatus 108-2 will be described with reference to FIG. 6, FIG. 8, and FIG. FIG. 8 is a schematic diagram showing the relationship between the base station devices 108-1 and 108-2, the control station devices 109-1 and 109-2, and the mobile station 200, and FIG. FIG. 2 is a sequence diagram showing operations of the control station devices 109-1 and 109-2 and the mobile station 200. The control station apparatus has two functions of a control station apparatus 109-1 that is an SRNC (Serving RNC) and a control station apparatus 109-2 that is a DRNC (Drift RNC). 109-2 can select a maximum of three base station apparatuses from the four base station apparatuses (maximum of AS is 3). 8 and 9, only two base station apparatuses 108-1 and 108-2 are shown, and descriptions of the other two base station apparatuses are omitted.

  First, reception level information, which is information on the reception level measured by level measuring section 204 of mobile station 200, is transmitted as measurement report to base station apparatus 108-1 (step ST901). That is, in FIG. 6, the mobile station 200 periodically transmits a measurement report at time t1, time t6, and time t9. Further, the mobile station 200 transmits a measurement report when each event is activated, in addition to the measurement report that is periodically transmitted.

  Next, base station apparatus 108-1 outputs a measurement report to control station apparatus 109-1 (step ST902).

  Next, the moving speed detection unit 104 of the base station apparatus 108-1 detects the moving speed of the mobile station 200, and reports the detection result to the control station apparatus 109-1.

  Next, based on the moving speed information of the mobile station 200 reported from the base station apparatus 108-1 by the HO control parameter determination unit 105, the control station apparatus 109-1 uses the HO control parameter determination unit 105 in FIG. HO control parameters such as Reporting Range, Hysteresis, Time to trigger, etc. are set by referring to the HO control parameter setting information that associates the moving speed and the HO control parameter shown in FIG.

  After setting the conditions for starting each Event in this way, for example, as shown in FIG. 6, at time t2, the power level of the base station apparatus 108-2 using P-CPICH3 becomes equal to or higher than Reporting Range. As a result, the control station apparatus 109-1 starts measuring Time to trigger from time t2 to time t4. However, since the power level of the mobile station 200 becomes equal to or lower than Reporting Range at time t3 before time t4, the base station device 108-2 does not activate Event 1A at this time. .

  Then, at time t5, when the power level of the base station apparatus 108-2 becomes equal to or higher than Reporting Range, the control station apparatus 109-1 starts measuring Time to trigger from time t5 to time t7. Then, since the power level of the mobile station 200 never falls below the reporting range between the time t5 and the time t7, the connection determination unit 106 transmits the measurement report and activates the Event 1A at the time t7. Base station apparatus 108-2 is selected as the base station apparatus to be added.

  Next, the control station apparatus 109-1 requests the control station apparatus 109-2 to connect the base station apparatus 108-2 selected by the connection determination unit 106 to the mobile station 200. Radio Link Addition Request Is output (step ST903).

  Next, the control station apparatus 109-2 outputs a Radio Link Addition Request that requests the base station apparatus 108-2 selected by the control station apparatus 109-1 to connect to the mobile station 200 ( Step ST904).

  Next, base station apparatus 108-2 returns Radio Link Addition Response, which is an answer as to whether or not connection with mobile station 200 is possible, to control station apparatus 109-2 (step ST905).

  Next, control station apparatus 109-2 returns Radio Link Addition Response, which is an answer as to whether or not base station apparatus 108-2 can be connected to mobile station 200, to control station apparatus 109-1 (step ST906). ).

  Next, when the Radio Link Addition Response returned from the base station device 108-2 is a response indicating that the mobile station 200 can be connected, the control station device 109-1 adds a connection to the base station device 108-2. Active Set Update which is a control signal is transmitted to base station apparatus 108-1 (step ST907).

  Next, base station apparatus 108-1 transmits Active Set Update, which is a control signal for adding connection to base station apparatus 108-2, to mobile station 200 (step ST908).

  Next, the mobile station 200 outputs an Active Set Update Complete, which is a signal for which the process of adding the base station apparatus 108-2 as a connection target is completed from the connection control unit 206, so that the base station apparatus 108 is transmitted from the mobile station 200. Active Set Update Complete is transmitted to −1 (step ST909).

  Next, the control station apparatus has two functions in the operation of selecting the base station apparatuses 108-1 and 108-2, and the mobile station 200 has the base station apparatus 108-1 and the base station apparatus 108-2. The operation when the connection with the base station apparatus 108-2 is canceled when connected is described with reference to FIG. 6 and FIG. FIG. 10 is a sequence diagram showing operations of base station apparatus 108, control station apparatus 109, and mobile station 200. It is assumed that the control station apparatuses 109-1 and 109-2 can select a maximum of three base station apparatuses from the four base station apparatuses (the maximum of AS is 3).

  First, reception level information that is information on the reception level measured by the level measurement unit 204 of the mobile station 200 is transmitted to the base station apparatus 108-1 as a Measurement Report (step ST1001). That is, in FIG. 6, the mobile station 200 periodically transmits a measurement report at time t1, time t6, and time t9. Further, the mobile station 200 transmits a measurement report when each event is activated, in addition to the measurement report that is periodically transmitted.

  Next, base station apparatus 108-1 outputs Measurement Report to control station apparatus 109-1 (step ST1002).

  Next, the moving speed detection unit 104 of the base station apparatus 108-1 detects the moving speed of the mobile station 200, and reports the detection result to the control station apparatus 109.

  Next, based on the moving speed information of the mobile station 200 reported from the base station apparatus 108-1 at the HO control parameter determination unit 105, the control station apparatus 109 displays the HO control parameter determination unit 105 as shown in FIG. 4. HO control parameters such as Reporting Range, Hysteresis, and Time to trigger are set by referring to HO control parameter setting information that associates the moving speed with the HO control parameter.

  After setting the conditions for starting each event in this way, for example, as shown in FIG. 6, at time t8, the power level of the base station apparatus 108-2 using the P-CPICH3 becomes less than Reporting Range. As a result, the control station device 109 starts measuring Time to trigger from time t8 to time t10. Then, since the power level of the mobile station 200 never exceeds the reporting range between the time t8 and the time t10, the connection determination unit 106 transmits the measurement report at the time t10 and activates the Event1B, thereby connecting the connection determination unit 106. Base station apparatus 108-2 is selected as the base station apparatus to be deleted. In addition, when the power level becomes equal to or higher than Reporting Range between time t8 and time t10, base station apparatus 108-2 is not selected as a base station apparatus to be deleted.

  Next, the control station device 109-1 has an active set that is a control signal for releasing the connection with the base station device 108-2 selected as the deletion target by the connection determination unit 106 with respect to the base station device 108-1. Update is output (step ST1003).

  Next, base station apparatus 108-1 transmits, to mobile station 200, Active Set Update, which is a control signal for releasing connection with base station apparatus 108-2 selected as the deletion target (step ST1004).

  Next, the mobile station 200 outputs an Active Set Update Complete, which is a signal for which the process of adding the base station apparatus 108-2 as a connection target is completed from the connection control unit 206, so that the base station apparatus 108 is transmitted from the mobile station 200. Active Set Update Complete is transmitted to −1 (step ST1005).

  Next, base station apparatus 108-1 outputs, to control station apparatus 109-1, Active Set Update Complete, which is a signal for which mobile station 200 has completed the process of deleting base station apparatus 108-2 as a deletion target. (Step ST1006).

  Next, the control station apparatus 109-1 requests the control station apparatus 109-2 to release the connection with the base station apparatus 108-2 selected by the connection determination unit 106 by the mobile station 200. A Link Delete Request is output (step ST1007).

  Next, the control station apparatus 109-2 requests the base station apparatus 108-2 to release the connection with the base station apparatus 108-2 selected by the connection determination unit 106 by the mobile station 200. A Link Delete Request is output (step ST1008).

  Next, base station apparatus 108-2 returns Radio Link Delete Response, which is an answer as to whether or not connection with mobile station 200 can be released, to control station apparatus 109-2 (step ST1009).

  Next, the control station apparatus 109-2 gives a radio link deletion response to the control station apparatus 109-1, which is an answer as to whether or not the base station apparatus 108-2 can release the connection with the mobile station 200. Output (step ST1010).

  FIG. 11 shows the HO control parameters set when the moving speed is slower than in FIG. Generally, the propagation fluctuation increases as the moving speed increases. Therefore, as shown in FIGS. 11 and 12, the reporting range is increased, the time to trigger is lengthened, and the HO interval is further lengthened as the moving speed becomes slower. On the other hand, as the moving speed increases, the reporting range is reduced, the time to trigger is shortened, and the HO interval is further shortened.

  Thus, according to the first embodiment, since the HO control parameter is made variable according to the moving speed of the terminal device, the control load can be reduced at the time of diversity handover, and the mobile station has a predetermined value. It is possible to reliably connect to a base station that can satisfy the communication quality. Also, according to the first embodiment, the reporting range is reduced as the moving speed increases, so that the mobile station enters the addition window and goes out of the base station apparatus and drop window to be added to the connection target and the deletion target. The base station apparatus which becomes can be reduced. Also, according to the first embodiment, the time to trigger and the HO interval are lengthened as the moving speed increases, so that the processing load can be reduced by reducing the number of base station apparatus addition and deletion processes. .

  In the first embodiment, the HO control parameter determination unit 105 and the connection determination unit 106 are provided in the control station apparatus 109. However, the HO control parameter determination unit 105 and the connection determination unit 106 are not limited to this. The station device 108 may be provided.

(Embodiment 2)
FIG. 13 is a block diagram showing configurations of base station apparatus 1302 and control station apparatus 1303 according to Embodiment 2 of the present invention. The antenna 101, duplexer 102, reception / demodulation unit 103, and transmission / modulation unit 107 constitute a base station device 1302. Further, the HO control parameter determination unit 105, the connection determination unit 106, and the environment detection unit 1301 constitute a control station device 1303. Note that the control station apparatus 1303 is an upper station of the base station apparatus 1302. Further, although the control station apparatus 1303 is connected to a plurality of base station apparatuses 1302 having the same configuration, for convenience of explanation, only one base station apparatus 1302 is shown in FIG. Description is omitted.

  Base station apparatus 1302 and control station apparatus 1303 according to Embodiment 2 are the same as base station apparatus 108 and control station apparatus 109 according to Embodiment 1 shown in FIG. Except for 104, an environment detection unit 1301 is added. In FIG. 13, parts having the same configuration as in FIG. Further, the configuration of the mobile station is the same as that shown in FIG.

  The environment detection unit 1301 determines whether the communication environment is a city or a countryside, and the received data input from the reception / demodulation unit 103 has a higher propagation loss indicating the communication environment, such as a higher level of a building or the like. It is judged that the city has many buildings, and it is judged that the country has few high-rise buildings as the propagation loss is small. Then, the environment detection unit 1301 outputs the determination result to the HO control parameter determination unit 105.

  The HO control parameter determination unit 105 sets HO control parameters based on the determination result input from the environment detection unit 1301, and outputs HO control parameter information that is information on the set HO control parameters to the connection determination unit 106.

  FIG. 11 shows HO control parameters set when the communication environment is a city compared to FIG. In general, as the communication environment becomes urban, the influence of an obstacle such as a building increases and the propagation loss increases. Therefore, from FIG. 11 and FIG. 12, the reporting range is increased and the time to trigger is lengthened and the HO interval is shortened as the communication environment becomes urban. On the other hand, as the communication environment becomes rural, the reporting range is decreased, the time to trigger is shortened, and the HO interval is further increased. The operations of the mobile station, base station apparatus 1302, and control station apparatus 1303 are the same as those in FIGS.

  Thus, according to the second embodiment, since the HO control parameter is made variable according to the communication environment, the control load can be reduced at the time of diversity handover, and the mobile station has a predetermined communication quality. It is possible to reliably connect to a base station that can be satisfied. Further, according to the second embodiment, the reporting range is increased as the communication environment becomes larger, so that it is possible to increase the number of base station devices that are included in the addition window and become connection addition targets. Also, according to the second embodiment, since the time to trigger is lengthened as the communication environment becomes urban, the processing load can be reduced by reducing the number of base station device addition and deletion processes. Also, according to the second embodiment, the HO interval is shortened as the communication environment becomes urban. Therefore, the number of base station apparatus addition / deletion determination processes that are performed each time a Measurement Report is received is increased. As a result, the number of base station apparatus candidates to be added and deleted can be increased.

  In the second embodiment, the HO control parameter determination unit 105, the connection determination unit 106, and the environment detection unit 1301 are provided in the control station device 1303. However, the present invention is not limited to this, and the HO control parameter determination unit 105, connection The determination unit 106 and the environment detection unit 1301 may be provided in the base station apparatus 1302. In the second embodiment, the city and the countryside are determined based on the propagation loss. However, the present invention is not limited thereto, and the city and the countryside are determined based on the electric field strength difference between different times. It is possible to use arbitrary parameters that have different values between the city and the countryside.

(Embodiment 3)
FIG. 14 is a block diagram showing configurations of base station apparatus 1402 and control station apparatus 1403 according to Embodiment 3 of the present invention. Antenna 101, duplexer 102, reception / demodulation unit 103, and transmission / modulation unit 107 constitute base station apparatus 1402. The HO control parameter determination unit 105, the connection determination unit 106, and the environmental condition input unit 1401 constitute a control station device 1403. Note that the control station apparatus 1403 is an upper station of the base station apparatus 1402. Further, although the control station apparatus 1403 is connected to a plurality of base station apparatuses 1402 having the same configuration, for convenience of explanation, only one base station apparatus 1402 is shown in FIG. Description is omitted.

  Base station apparatus 1402 and control station apparatus 1403 according to Embodiment 3 are the same as base station apparatus 108 and control station apparatus 109 according to Embodiment 1 shown in FIG. Except for 104, an environmental condition input unit 1401 is added. 14, parts having the same configuration as in FIG. 1 are denoted by the same reference numerals and description thereof is omitted. Further, the configuration of the mobile station is the same as that shown in FIG.

  The environmental condition input unit 1401 sets the communication environment mode from the urban area to the countryside in a stepwise manner. When the user selects the mode, information on the mode selected by the user is sent to the HO control parameter determination unit 105. Output.

  The HO control parameter determination unit 105 sets the HO control parameter based on the mode information indicating whether the communication environment is a city or the communication environment is a country input from the environmental condition input unit 1401, and the set HO control parameter The HO control parameter information, which is information on the

  FIG. 11 shows HO control parameters set when the communication environment is a city compared to FIG. In general, as the communication environment becomes urban, the influence of an obstacle such as a building increases and the propagation loss increases. Therefore, from FIG. 11 and FIG. 12, the reporting range is increased and the time to trigger is lengthened and the HO interval is shortened as the communication environment becomes urban. On the other hand, as the communication environment becomes rural, the reporting range is decreased, the time to trigger is shortened, and the HO interval is further increased. The operations of the mobile station, base station apparatus 1402, and control station apparatus 1403 are the same as those in FIGS.

  Thus, according to the third embodiment, since the HO control parameter is made variable according to the communication environment, the control load can be reduced at the time of diversity handover, and the mobile station has a predetermined communication quality. It is possible to reliably connect to a base station that can be satisfied. Further, according to the third embodiment, when the communication environment changes from the countryside to the city in the future, the setting of the communication environment can be changed by a simple method by an external operation such as key input. Further, according to the third embodiment, since the reporting range is increased as the mode selected by the user is urban, it is possible to increase the number of base station apparatuses to be added to the connection by entering into the Addition Window. Also, according to the third embodiment, as the mode selected by the user is larger in the city, the time to trigger is lengthened, so that the processing load is reduced by reducing the number of base station device addition and deletion processes. Can do. Further, according to the third embodiment, the HO interval is shortened as the mode selected by the user is urban, so the number of processes for determining the addition and deletion of the base station device performed each time the Measurement Report is received. As a result, the number of base station apparatus candidates to be added and deleted can be increased.

  In the third embodiment, the HO control parameter determination unit 105, the connection determination unit 106, and the environmental condition input unit 1401 are provided in the control station device 1403. However, the present invention is not limited to this, and the HO control parameter determination unit 105, The connection determination unit 106 and the environmental condition input unit 1401 may be provided in the base station apparatus 1402. In the third embodiment, whether the communication environment is urban or rural is switched by key input. However, the present invention is not limited to this and can be switched by any input method other than keys. .

(Embodiment 4)
FIG. 15 is a block diagram showing configurations of base station apparatus 1503 and control station apparatus 1504 according to Embodiment 4 of the present invention. The antenna 101, duplexer 102, reception / demodulation unit 103, transmission / modulation unit 107, delay profile generation unit 1501, and path detection unit 1502 constitute a base station device 1503. Further, the HO control parameter determination unit 105 and the connection determination unit 106 constitute a control station apparatus 1504. Note that the control station apparatus 1504 is an upper station of the base station apparatus 1503. Further, although the control station apparatus 1504 is connected to a plurality of base station apparatuses 1504 having the same configuration, for convenience of explanation, only one base station apparatus 1503 is shown in FIG. Description is omitted.

  Base station apparatus 1503 and control station apparatus 1504 according to Embodiment 4 are the same as base station apparatus 108 and control station apparatus 109 according to Embodiment 1 shown in FIG. A delay profile generation unit 1501 and a path detection unit 1502 are added except for 104. In FIG. 15, parts having the same configuration as in FIG. Further, the configuration of the mobile station is the same as that shown in FIG.

  Delay profile generation section 1501 generates a delay profile from the received data input from reception / demodulation section 103 and outputs the delay profile to path detection section 1502.

  The path detection unit 1502 detects the number of paths having a reception level equal to or higher than a predetermined value from the delay profile information input from the delay profile generation unit 1501, and determines the path information that is information of the detected number of paths as a HO control parameter. To the unit 105.

  The HO control parameter determination unit 105 sets the HO control parameter based on the path information indicating the communication environment input from the path detection unit 1502, and sets the HO control parameter information that is information on the set HO control parameter to the connection determination unit 106. Output.

  FIG. 11 shows HO control parameters set when the number of detected paths is smaller than in FIG. In general, the influence of multipath interference increases as the number of paths increases. Therefore, from FIG. 11 and FIG. 12, as the number of detected paths increases, the reporting range is reduced, the time to trigger is shortened, and the HO interval is further shortened. On the other hand, as the number of detected paths increases, the reporting range is increased, the time to trigger is increased, and the HO interval is further increased. The operations of the mobile station, base station apparatus 1503, and control station apparatus 1504 are the same as those in FIG. 4 and FIGS.

  As described above, according to the fourth embodiment, since the HO control parameter is made variable according to the detected number of paths, the control load can be reduced during the diversity handover, and the mobile station can perform a predetermined process. It is possible to reliably connect to a base station that can satisfy the communication quality. Also, according to the fourth embodiment, as the multipath interference increases, the reporting range is reduced. Therefore, it is possible to reduce the number of base station devices that are added to the addition window and become connection addition targets, and the multipath interference decreases. Since the reporting range is increased, it is possible to increase the number of base station devices that are included in the addition window and to which connections are to be added. Also, according to the fourth embodiment, the time to trigger is reduced and the HO interval is reduced as the multipath interference increases, so that the determination time for adding and deleting the base station apparatus is shortened and the Measurement Report is received. By increasing the number of times of determining the addition and deletion of base station apparatuses performed every time, it is possible to immediately connect to the optimal number of optimal base station apparatuses.

  In the fourth embodiment, the reporting range is reduced and the time to trigger is shortened and the HO interval is shortened as the number of detected paths increases. However, the present invention is not limited to this. As the number of detected paths increases, the reporting range may be increased, the time to trigger may be increased, and the HO interval may be increased. In the fourth embodiment, the HO control parameter determination unit 105 and the connection determination unit 106 are provided in the control station apparatus 1504. However, the HO control parameter determination unit 105 and the connection determination unit 106 are not limited to this. You may provide in the station apparatus 1503. FIG.

(Embodiment 5)
FIG. 16 is a block diagram showing configurations of base station apparatus 1602 and control station apparatus 1603 according to Embodiment 5 of the present invention. The antenna 101, duplexer 102, reception / demodulation unit 103, and transmission / modulation unit 107 constitute a base station device 1602. The HO control parameter determination unit 105, the connection determination unit 106, and the resource detection unit 1601 constitute a control station device 1603. Note that the control station device 1603 is an upper station of the base station device 1602. Further, although the control station apparatus 1603 is connected to a plurality of base station apparatuses 1602 having the same configuration, for convenience of explanation, only one base station apparatus 1602 is shown in FIG. Description is omitted.

  Base station apparatus 1602 and control station apparatus 1603 according to Embodiment 5 are the same as base station apparatus 108 and control station apparatus 109 according to Embodiment 1 shown in FIG. Except for 104, a resource detection unit 1601 is added. In FIG. 16, parts having the same configuration as in FIG. Further, the configuration of the mobile station is the same as that shown in FIG.

  The resource detection unit 1601 detects the number of resources (number of users) from the received data input from the reception / demodulation unit 103, and outputs resource number information that is information on the detected number of resources to the HO control parameter determination unit 105.

  The HO control parameter determination unit 105 sets the HO control parameter based on the resource number information indicating the communication environment input from the resource detection unit 1601, and sets the HO control parameter information that is information of the set HO control parameter as the connection determination unit 106. Output to.

  When the resource is defined as electric power, FIG. 11 shows the HO control parameters set when the number of resources is larger than that in FIG. 11 and 12, as the number of resources decreases, the reporting range is reduced, the time to trigger is shortened, and the HO interval is further shortened. On the other hand, as the number of resources increases, the reporting range is increased, the time to trigger is increased, and the HO interval is further increased. The operations of the mobile station, base station apparatus 1602 and control station apparatus 1603 are the same as those in FIG. 4 and FIGS.

  Thus, according to the fifth embodiment, since the HO control parameter is made variable according to the number of resources, the control load can be reduced at the time of diversity handover, and the mobile station has a predetermined communication quality. It is possible to reliably connect to a base station that can be satisfied. Further, according to the fifth embodiment, when the resource is small, the reporting range is reduced, so that it is possible to reduce the number of base station devices that are added to the addition window and become connection addition targets and use up resources. Can be prevented. Also, according to the fifth embodiment, when the resource is low, the time to trigger is reduced and the HO interval is reduced, so that the determination time for addition and deletion of the base station apparatus is shortened and the measurement report is received each time. By increasing the number of base station device addition / deletion processes performed in a short time, it is possible to immediately connect to the optimal base station device, and when there are few resources, the minimum number of base station devices And can be connected efficiently.

  In the fifth embodiment, the reporting range is reduced and the time to trigger is shortened and the HO interval is further shortened as the number of resources is reduced. However, the number of resources is not limited to this, and the number of resources depends on the communication environment. The reporting range may be increased and the time to trigger may be lengthened and the HO interval may be lengthened as the number decreases. In the fifth embodiment, the HO control parameter determination unit 105, the connection determination unit 106, and the resource detection unit 1601 are provided in the control station device 1603. However, the present invention is not limited to this, and the HO control parameter determination unit 105, connection The determination unit 106 and the resource detection unit 1601 may be provided in the base station device 1602.

(Embodiment 6)
FIG. 17 is a block diagram showing configurations of base station apparatus 1702 and control station apparatus 1703 according to Embodiment 6 of the present invention. The antenna 101, duplexer 102, reception / demodulation unit 103, and transmission / modulation unit 107 constitute a base station apparatus 1702. The HO control parameter determination unit 105, the connection determination unit 106, and the communication quality detection unit 1701 constitute a control station apparatus 1703. Note that the control station apparatus 1703 is an upper station of the base station apparatus 1702. In addition, the control station apparatus 1703 is connected to a plurality of base station apparatuses 1702 having the same configuration, but for convenience of explanation, only one base station apparatus 1702 is shown in FIG. Description is omitted.

  Base station apparatus 1702 and control station apparatus 1703 according to Embodiment 6 are the same as base station apparatus 108 and control station apparatus 109 according to Embodiment 1 shown in FIG. Except for 104, a communication quality detection unit 1701 is added. In FIG. 17, parts having the same configuration as in FIG. Further, the configuration of the mobile station is the same as that shown in FIG.

  The communication quality detection unit 1701 detects a measurement value indicating communication quality from the received data input from the reception / demodulation unit 103, and outputs communication quality information that is information of the detected measurement value to the HO control parameter determination unit 105. As the communication quality information, a desired signal power to interference signal power ratio (SIR), an interference power value, and the like can be used.

  The HO control parameter determination unit 105 sets the HO control parameter based on the communication quality information indicating the communication environment input from the communication quality detection unit 1701, and sets the HO control parameter information that is information of the set HO control parameter as the connection determination unit. To 106.

  FIG. 11 shows HO control parameters set when the detected communication quality is deteriorated compared to FIG. 11 and 12, the reporting range is increased as the communication quality deteriorates, the time to trigger is shortened, and the HO interval is further shortened. On the other hand, the reporting range is decreased as the communication quality is improved, the time to trigger is shortened, and the HO interval is further lengthened. The operations of the mobile station, base station apparatus 1702, and control station apparatus 1703 are the same as those in FIGS.

  Thus, according to the sixth embodiment, since the HO control parameter is made variable according to the communication quality, the control load can be reduced at the time of diversity handover, and the mobile station has a predetermined communication quality. It is possible to reliably connect to a base station that can be satisfied. Further, according to the sixth embodiment, the reporting range is increased as the communication quality deteriorates, so that it is possible to improve the communication quality by increasing the number of base station devices to be added to the connection window within the addition window. Further, according to the sixth embodiment, the time to trigger is reduced as the communication quality deteriorates. Therefore, the base station device can be immediately connected to the optimum base station device by reducing the addition / deletion determination time. can do. Also, according to the sixth embodiment, the HO interval is reduced as the communication quality deteriorates, so that the number of times of determining the addition and deletion of the base station apparatus performed every time the Measurement Report is received is increased. Thus, it is possible to increase the number of base station devices to be connected and deleted.

  In the sixth embodiment, the HO control parameter determination unit 105, the connection determination unit 106, and the communication quality detection unit 1701 are provided in the control station apparatus 1703. However, the present invention is not limited to this, and the HO control parameter determination unit 105, The connection determination unit 106 and the communication quality detection unit 1701 may be provided in the base station device 1702.

  In the first to sixth embodiments, the reporting range, time to trigger, and HO interval are all variably set. However, the present invention is not limited to this, and any of reporting range, time to trigger, and HO interval is not limited thereto. One or any two of them may be set variably.

  The control station apparatus and handover method according to the present invention can reduce the control load when diversity handover is performed, and the mobile station has an effect of reliably connecting to a base station that can satisfy a predetermined communication quality. This is useful for determining whether or not to perform handover.

The block diagram which shows the structure of the base station apparatus and control station apparatus which concern on Embodiment 1 of this invention. Block diagram showing a configuration of a mobile station according to Embodiment 1 of the present invention. Schematic diagram showing the relationship between a mobile station, a base station apparatus and a control station apparatus according to Embodiment 1 of the present invention. Sequence diagram showing operations of mobile station, base station apparatus and control station apparatus according to Embodiment 1 of the present invention The figure which shows the HO control parameter setting information which concerns on Embodiment 1 of this invention. The figure which shows the time transition of the electric power level which concerns on Embodiment 1 of this invention Sequence diagram showing operations of mobile station, base station apparatus and control station apparatus according to Embodiment 1 of the present invention Schematic diagram showing the relationship between a mobile station, a base station apparatus and a control station apparatus according to Embodiment 1 of the present invention. Sequence diagram showing operations of mobile station, base station apparatus and control station apparatus according to Embodiment 1 of the present invention Sequence diagram showing operations of mobile station, base station apparatus and control station apparatus according to Embodiment 1 of the present invention The figure which shows the time transition of the electric power level which concerns on Embodiment 1 of this invention The figure which shows the time transition of the electric power level which concerns on Embodiment 1 of this invention The block diagram which shows the structure of the base station apparatus and control station apparatus which concern on Embodiment 2 of this invention. The block diagram which shows the structure of the base station apparatus and control station apparatus which concern on Embodiment 3 of this invention. The block diagram which shows the structure of the base station apparatus and control station apparatus which concern on Embodiment 4 of this invention. The block diagram which shows the structure of the base station apparatus and control station apparatus which concern on Embodiment 5 of this invention. The block diagram which shows the structure of the base station apparatus and control station apparatus which concern on Embodiment 6 of this invention. Schematic diagram showing diversity handover Figure showing the power level over time

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Antenna 102 Duplexer 103 Reception / demodulation part 104 Movement speed detection part 105 HO control parameter determination part 106 Connection determination part 107 Transmission / modulation part 108 Base station apparatus 109 Control station apparatus

Claims (24)

Setting means for variably setting a range of received power in the terminal device that can be received by the terminal device with a predetermined quality based on a communication environment;
Connection determination means for selecting the base station apparatus in which the received power of each base station apparatus in the terminal apparatus is within the range of the received power set by the setting means;
Instructing means for instructing the terminal device to connect to the base station apparatus selected by the connection determining means;
A control station apparatus comprising:   The control station apparatus according to claim 1, wherein the setting unit decreases the range of the received power as the moving speed of the terminal apparatus indicating the communication environment increases.   3. The setting unit according to claim 1, wherein the setting unit reduces the range of the received power as the number of paths whose reception level in the delay profile indicating the communication environment is equal to or greater than a threshold value increases. Control station device.   The control station apparatus according to any one of claims 1 to 3, wherein the setting unit reduces the range of the received power as the power resource of the base station apparatus indicating the communication environment decreases.   The control station apparatus according to any one of claims 1 to 4, wherein the setting unit reduces the range of the received power as communication quality indicating the communication environment becomes better.   The control station apparatus according to claim 1, wherein the setting unit increases the range of the received power as the propagation loss indicating the communication environment increases.   The setting means increases the range of the received power as the mode selected by the user at any timing among a plurality of modes provided in stages from the city to the countryside is the city. The control station apparatus according to any one of claims 1 to 6. A setting means for variably setting a time interval for receiving power information, which is received power information for each base station device in the terminal device, from the terminal device;
Connection determination means for selecting a base station apparatus in which the received power of the received power information reported at the time interval is in a range that can be received at a predetermined quality by the terminal device;
Instructing means for instructing the terminal device to connect to the base station apparatus selected by the connection determining means;
A control station apparatus comprising:   9. The control station apparatus according to claim 8, wherein the setting means increases the time interval as the moving speed of the terminal apparatus indicating the communication environment increases.   10. The control station according to claim 8, wherein the setting unit decreases the time interval as the number of paths whose reception level in the delay profile indicating the communication environment is equal to or greater than a threshold increases. apparatus.   The control station apparatus according to any one of claims 8 to 10, wherein the setting unit decreases the time interval as the power resource of the base station apparatus indicating the communication environment decreases.   The control station apparatus according to claim 8, wherein the setting unit increases the time interval as communication quality indicating the communication environment becomes better.   The control station apparatus according to claim 8, wherein the setting unit decreases the time interval as a propagation loss indicating the communication environment increases.   The said setting means reduces the said time interval, so that the said mode selected at arbitrary timings by a user is a city among the several modes from a city to a countryside, The said time interval is made small. The control station apparatus according to any one of 13. A setting means for variably setting a continuation time to be compared with a time in which the received signal in the terminal device continues and satisfies a predetermined quality, based on the communication environment;
A connection determination means for selecting the base station apparatus for which the reception signal in the terminal apparatus continues and satisfies a predetermined quality for the duration or longer;
Instructing means for instructing the terminal device to connect to the base station apparatus selected by the connection determining means;
A control station apparatus comprising:   16. The control station apparatus according to claim 15, wherein the setting means increases the duration as the moving speed of the terminal apparatus indicating the communication environment increases.   The control station according to claim 15 or 16, wherein the setting unit decreases the duration as the number of paths whose reception level in the delay profile indicating the communication environment is equal to or greater than a threshold value increases. apparatus.   The control station apparatus according to any one of claims 15 to 17, wherein the setting unit decreases the duration as the power resource of the base station apparatus indicating the communication environment decreases.   The control station apparatus according to any one of claims 15 to 18, wherein the setting unit increases the duration as the communication quality indicating the communication environment becomes better.   The control station apparatus according to any one of claims 15 to 19, wherein the setting unit increases the duration as the propagation loss indicating the communication environment increases.   The said setting means enlarges the said duration, so that the said mode selected at arbitrary timings by a user is a city among several modes from a city to a countryside, The said duration is enlarged. The control station apparatus according to any one of 20. A step of variably setting a range of received power in the terminal device that can be received by the terminal device with a predetermined quality based on a communication environment;
Selecting the base station device in which the received power of each base station device in the terminal device is within the range;
Instructing the terminal device to connect to the selected base station device;
A handover method comprising: A step of variably setting a time interval based on the communication environment to have the received power information reported from the terminal device as received power information for each base station device in the terminal device;
Selecting a base station device in which the received power of the received power information reported at the time interval is in a range that can be received at a predetermined quality by the terminal device;
Instructing the terminal device to connect to the selected base station device;
A handover method comprising: A step of variably setting a continuation time to be compared with a time in which the received signal in the terminal device continues and satisfies a predetermined quality, based on the communication environment;
Selecting the base station apparatus for which the time for which the received signal in the terminal apparatus continues to satisfy a predetermined quality is equal to or longer than the duration;
Instructing the terminal device to connect to the selected base station device;
A handover method comprising:

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