JP2007306620A - Line control method of cellular system, cellular system and base station controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a cellular system capable of reducing line blocking probability and efficiently using the throughput of a base station controller. <P>SOLUTION: In this cellular system in which a line can be connected between a mobile station 30 and base stations 10 and 20 in different frequencies, the mobile station 30 measures each receiving quality of a set line and a connection destination line, and when a base station controller 60 performs line switching control in accordance with these measurement results, a judgement threshold for line switching control is changed in accordance with traffic of a carrier frequency that is currently used. When traffic to the carrier frequency that is currently used is high, the judgement threshold is made low to make the probability of different frequency switching high and a line blocking probability is reduced. On the other hand, when the traffic to the carrier frequency that is currently used is low, the judgement threshold is made high to make the probability of different frequency switching low and a different frequency switching control load is reduced. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a line control method and cellular system in a cellular system, and a base station controller used therefor.

  In a cellular system using a code division multiple access scheme, transmission power control is performed to increase the line capacity. Usually, transmission power control is performed using a signal power to interference power ratio (SIR) value represented by the following equation.

SIR = S / (I + N) (1)
Here, S is the desired signal power, I is the interference power per band, and N is the noise power per band. In the transmission power control, the reception SIR in the equation (1) is measured on the reception side, and if the measurement result is smaller than the target SIR, the transmission side is instructed to increase the transmission power. On the other hand, by instructing a decrease in transmission power, it is possible to control the line quality to be constant, and the line capacity can be increased.

  Also, in a cellular system using a code division multiple access scheme, when a plurality of carrier frequencies are assigned, a different frequency switching technique for switching the carrier frequency is important. This different frequency switching technique usually improves frequency utilization efficiency, and is performed for the purpose of avoiding a line interruption phenomenon due to deterioration of the line quality at the carrier frequency currently in use. Hereinafter, the different frequency switching technology will be described from the viewpoint of the system configuration.

  FIG. 7 shows a configuration diagram of a cellular system when two carrier frequencies are used in the same service area, and FIG. 8 shows a carrier frequency arrangement diagram in uplink and downlink. Referring to FIG. 7, a plurality of base stations 10, 11, 20, and 21 are provided, and a base station control device 60 for controlling these base stations is provided.

  The mobile station 30 can connect a line with the base stations 10, 11, 20, and 21. The carrier frequencies used by the mobile station 30 on the lines with the base stations 10 and 11 are assumed to use the carrier frequency 101 and the carrier frequency 103 in FIG. Similarly, the carrier frequency used by the mobile station 30 on the line with the base stations 20 and 21 is assumed to use the carrier frequency 102 and the carrier frequency 104 in FIG. 8 on the uplink and downlink, respectively.

  In addition, during the communication, the mobile station 30 determines whether to connect to the base stations 10 and 11 or to connect to the base stations 20 and 21, and the different frequency switching control for performing the connection is performed by the base station controller. At 60. Further, the base station controller 60 has a function of receiving traffic information at each carrier frequency for the different frequency switching control. Note that the different frequency switching control in the base station control device 60 is controlled under certain conditions for all base stations and mobile stations managed by the base station control device.

  In FIG. 7, 40 and 41 are perch channels, 50 and 51 are downlink dedicated channels, and 70 and 71 are uplink dedicated channels.

  Hereinafter, two methods related to the present invention regarding the different frequency switching control method will be described. First, the different frequency switching control method according to the reception quality of the perch channel, which is the first different frequency switching control method, will be described.

  In FIG. 7, it is assumed that the mobile station 30 is connected to the base station 10 and the line as an initial state. At this time, in the downlink of the mobile station 30, the currently used carrier frequency is 103 and the different frequency switching destination carrier frequency is 104. On the other hand, on the uplink, the carrier frequency currently used by the mobile station 30 is 101, and the carrier frequency at the different frequency switching destination is 102.

  At this time, the mobile station 30 measures and compares the reception quality Q_1 of the perch channel of the carrier frequency currently in use and the reception quality Q_2 of the perch channel of the carrier frequency 104 that is the different frequency switching destination, and performs different frequency switching. Different frequency switching is performed when the difference between the reception quality Q_2 of the previous carrier frequency and the reception quality Q_1 of the perch channel of the carrier frequency currently in use satisfies the following condition.

Q_2-Q_1> Th_HO_Quality [dB] (2)
Here, the different frequency switching means switching of the carrier frequency to be used. In this case, the frequency is switched from the carrier frequency 103 to the carrier frequency 104 in the downlink, and from the carrier frequency 101 to the carrier frequency 102 in the uplink. This means switching the frequency. In Expression (2), Th_HO_Quality is a determination threshold value for different frequency switching control, and Th_HO_Quality has a positive value.

  Normally, in Formula (2), the probability of occurrence of line interruption decreases as the determination threshold Th_HO_Quality for different frequency switching control decreases, but the control load for different frequency switching control increases, so an optimal value is set. The above is the description regarding the first different frequency switching control method.

  Next, a different frequency switching control method according to traffic, which is a second different frequency switching control method, will be described. In FIG. 7, it is assumed that the mobile station 30 is connected to the base station 10 and the line as an initial state. At this time, the carrier frequencies currently in use for the mobile station 30 are 101 and 103 on the uplink / downlink, respectively. On the other hand, for the mobile station 30, the carrier frequency of the different frequency switching destination is 102 and 104 on the uplink / downlink, respectively. At this time, the base station controller 60 measures the traffic of the carrier frequencies 101 and 103 currently in use and the carrier frequencies 102 and 104 of the different frequency switching destinations, respectively.

  Hereinafter, the uplink will be considered. When the traffic of the carrier frequency 102 currently in use increases and approaches the line capacity value of the system, the reception quality of the mobile station connected to the line using the carrier frequency currently in use deteriorates, causing a line cut-off. The possibility increases. Normally, when the traffic of the carrier frequency currently in use exceeds a certain threshold, the base station controller 60 determines that the carrier frequency is high traffic, and the channel quality deteriorates with respect to the carrier frequency that becomes high traffic. In order to suppress this, a new line connection is restricted, and the mobile station group using the carrier frequency is controlled to lower the transmission rate and reduce the amount of dryness given to other users. Note that lowering the transmission rate is not preferable because it lowers the throughput for each mobile station.

  Now, when the carrier frequency currently in use becomes high traffic, when other carrier frequencies can be used, it is possible to switch from a high traffic carrier frequency to a non-high traffic carrier frequency. It is possible to avoid deterioration of the line quality. Hereinafter, the different frequency switching control according to the traffic will be described in detail.

  The base station controller 60 observes the carrier frequency 101 currently in use, and at a time when the traffic of the carrier frequency currently in use exceeds a determination threshold Th_Load, the base station controller 60 The measurement of the perch channel reception quality Q_2 of the carrier frequency of the different frequency switching destination is instructed. Receiving this instruction, the mobile station 30 measures the reception quality Q_2 of the perch channel to which the different frequency is switched, and notifies the base station controller 60 of the measurement result.

  In the base station controller 60 that has received this measurement result, the measurement result of the reception quality Q_2 of the perch channel of the different frequency switching destination in the mobile station 30 is triggered when the following result is satisfied. Control to switch to frequency.

Q_2> Th_HO_Load (3)
Here, Th_HO_Load in Expression (3) is a determination threshold value. In Expression (3), the higher the determination threshold Th_HO_Load, the better the reception quality of the perch channel after completion of different frequency switching, but the probability of satisfying the condition of Expression (3) decreases and the transmission rate decreases. The probability of becoming higher. Therefore, the determination threshold Th_HO_Load is set slightly higher than the level at which the reception quality of the perch channel can be communicated. This is to reduce the probability that the low transmission rate control is performed within the range that the received product value of the perch channel of the carrier frequency of the different frequency switching destination is a communicable level. Note that the traffic measurement in the base station control device 60 may be performed on the downlink carrier frequency. The above is the description regarding the second different frequency switching control method.

  Normally, in a cellular system using a plurality of carriers, a mobile station of the system uses a method of switching the oscillation frequency of an oscillator as necessary using only one oscillator from the viewpoint of reducing power consumption. It is common. When measuring the reception quality of the carrier of the different frequency switching destination under such a configuration of the mobile station, since the number of oscillators is one, the mobile station measures the reception quality of the carrier of the different frequency switching destination. In it, data from a carrier currently in use cannot be received. Therefore, in the system, it is necessary to create a transmission waveform in a state where data free time is secured in advance for the measurement time of the reception quality of the carrier to which the different frequency is switched.

  Here, in order to create the data free time when the communication speed is constant, a technology (data compression technology) for compressing data for the free time to be created is required. In general, in the data compression technique, transmission data is temporally compressed by a method of lowering a spreading factor or a method of raising a coding rate by not transmitting a part of encoded data. Compared to the case where the data compression technique is not used, the data correction technique deteriorates the error correction capability in reception, so that the frequency utilization efficiency is reduced. Therefore, it is not preferable that the ratio of data free time to communication time (hereinafter referred to as data free time ratio) increases.

  From the above, when measuring different frequencies, it is desirable to accurately determine the timing of switching between different frequencies with a small data free time ratio. In order to reduce the data idle time ratio, in the conventional technique, an improvement measure is taken with respect to the first different frequency switching control method. As an improvement measure, the improvement measure is to limit the different frequency measurement range, and the improvement measure will be described below.

Referring to FIG. 9, the mobile station 30 shows time waveforms of the reception quality Q_1 of the perch channel of the carrier frequency currently in use and the reception quality Q_2 of the perch channel of the carrier frequency of the different frequency switching destination in the downlink. . In FIG. 9, in order to reduce the data idle time at the time of different frequency measurement, the mobile station 30 determines that the reception quality Q_1 of the perch channel of the currently used carrier is
Q_1 <Th_Start ...... (4)
The time t1 (or t3) that satisfies the above is used as an opportunity to measure different frequencies, and then the reception quality Q_1 of the perch channel of the currently used carrier is
Q_1> Th_End ...... (5)
When the time t2 that satisfies the above condition is triggered, the different frequency measurement is stopped, or when the time t4 that satisfies the expression (2) is triggered, the different frequency switching control is started and at the same time, the different frequency measurement is stopped.

  The determination threshold values Th_Start and Th_End in Expression (4) and Expression (5) may take a margin that satisfies the following expression.

Th_End−Th_Start> 0 [dB] (6)
In this equation (6), it means that the margin increases as the difference between Th_End and Th_Start increases. In general, as the margin increases, the frequency of starting / stopping different frequency measurement decreases, which has the advantage of reducing the control load on the base station controller. On the other hand, since the frequency of stopping the different frequency measurement is decreased, the data free time ratio is increased and the line capacity is decreased. Therefore, it is necessary to set an optimum value for setting the margin in equation (6).

  Based on the above concept, by limiting the different frequency measurement range using the determination thresholds Th_Start and Th_End, the data free time ratio can be reduced as compared with the case where the different frequency measurement range is not limited. it can.

In addition, there exist patent document 1, 2 etc. as related technology.
JP 2001-285911 A JP 2001-045536 A

  In the above-described different frequency switching method in the technology related to the present invention, all base stations and mobile stations controlled by the base station control device are controlled under a certain condition. Therefore, regardless of the level of traffic for each carrier frequency. Thus, the equivalent different frequency switching control is performed. As a result, the higher the traffic with respect to the carrier frequency, the closer to the limit value of the radio channel capacity, and the problem that the different frequency switching probability does not increase even though the channel blocking probability increases.

  On the other hand, the lower the traffic with respect to the carrier frequency, the greater the margin of the radio channel capacity and the lower the probability of switching between different frequencies even though the probability of switching off of the channel decreases, so the control load of the base station controller decreases. However, there is a problem that the processing efficiency of the base station control device is reduced.

  Further, in the different frequency switching method in the technology related to the present invention described above, since all base stations and mobile stations controlled by the base station control device are controlled under a certain condition, the transmission rate for each mobile station is increased or decreased. Regardless of this, the equivalent different frequency switching control is performed. As a result, the higher the transmission rate for the mobile station, the closer to the limit value of the radio channel capacity, and the problem that the different frequency switching probability does not increase even though the channel blocking probability increases.

  On the other hand, the lower the transmission rate of the mobile station, the greater the margin of radio channel capacity, and the probability of switching between different frequencies does not decrease despite the fact that the probability of switching off the channel decreases. There is also a problem that the processing efficiency of the base station controller is not reduced.

  From the above, in the technique related to the present invention, it is a problem to reduce the line blocking probability and efficiently use the processing capability of the base station controller.

  An object of the present invention is to provide a cellular system line control method and a cellular system, and a base station control apparatus used therefor, which reduce the probability of line interruption and efficiently use the processing capability of the base station control apparatus.

According to the present invention, a mobile station, first and second base stations, and a base station controller are included, and the mobile station and the first base station set up a line using a first frequency. The mobile station and the second base station communicate with each other by setting a line using a second frequency, and the mobile station sets the line with the first base station. The first reception quality of the first frequency is measured during communication, and the second reception quality of the second frequency is controlled according to the first reception quality. ,
A channel control method in a cellular system for performing communication by switching a channel to a second base station according to the second reception quality, wherein the base station control device is configured to perform traffic for the first frequency. Accordingly, there is obtained a line control method including a step of changing and controlling the second reception quality measurement condition.

  According to the present invention, a mobile station, first and second base stations, and a base station controller are included, and the mobile station and the first base station set up a line using a first frequency. The mobile station and the second base station communicate with each other by setting a line using a second frequency, and the mobile station sets the line with the first base station. The first reception quality of the first frequency and the second reception quality of the second frequency are controlled to measure the second reception quality and the first reception during communication. A line control method in a cellular system for controlling communication by switching a line to the second base station when a difference from quality is equal to or greater than a predetermined threshold, wherein the base station controller has a first frequency And the predetermined threshold value is changed according to the traffic. Line control method characterized by comprising the step of controlling is obtained.

  According to the present invention, a mobile station, first and second base stations, and a base station controller are included, and the mobile station and the first base station set up a line using a first frequency. The mobile station and the second base station perform communication by setting a line using a second frequency, and the mobile station sets the line with the first base station. When the second reception quality of the second frequency is controlled to be measured during communication and the second reception quality is equal to or higher than a predetermined threshold, the line is switched to the second base station. A channel control method in a cellular system that controls to perform communication, wherein the base station controller measures traffic to the first frequency and changes and controls the predetermined threshold according to the traffic. A line control method characterized in that it is included is obtained.

  According to the present invention, a mobile station, first and second base stations, and a base station controller are included, and the mobile station and the first base station set up a line using a first frequency. The mobile station and the second base station perform communication by setting a line using a second frequency, and the mobile station sets the line with the first base station. During the communication, the first reception quality of the first frequency is controlled to be measured, the second reception quality of the second frequency is measured according to the first reception quality, and the second reception quality is measured. According to the received quality, a line control method in a cellular system for controlling the communication by switching the line to the second base station, in the base station controller, according to the transmission rate for the mobile station, Including a step of changing and controlling reception quality measurement conditions for the second frequency. Line control wherein the door is obtained.

  According to the present invention, a mobile station, first and second base stations, and a base station controller are included, and the mobile station and the first base station set up a line using a first frequency. The mobile station and the second base station perform communication by setting a line using a second frequency, and the mobile station sets the line with the first base station. The second reception quality and the first reception quality are controlled so as to measure the first reception quality of the first frequency and the second reception quality of the second frequency during communication. A line control method in a cellular system for controlling communication by switching a line to a second base station when a difference between the base station and the base station is equal to or greater than a predetermined threshold, wherein the base station control device includes a transmission rate for the mobile station. And a step of changing and controlling the predetermined threshold according to That the line control method is obtained.

  According to the present invention, a mobile station, first and second base stations, and a base station controller are included, and the mobile station and the first base station set up a line using a first frequency. The mobile station and the second base station communicate with each other by setting a line using a second frequency, and the mobile station sets the line with the first base station. When the second reception quality of the second frequency is controlled during communication and the second reception quality is equal to or higher than a predetermined threshold, a line is connected to the second base station. A line control method in a cellular system that controls to perform communication by switching between, and includes a step of changing and controlling the predetermined threshold according to a transmission rate for the mobile station in the base station controller. A line control method is obtained.

  According to the present invention, a mobile station, first and second base stations, and a base station controller are included, and the mobile station and the first base station set up a line using a first frequency. The mobile station and the second base station communicate with each other by setting a line using a second frequency, and the mobile station sets the line with the first base station. The first reception quality of the first frequency is measured during communication, and the second reception quality of the second frequency is controlled according to the first reception quality. In accordance with the second reception quality, the cellular system is configured to perform communication by switching the line to the second base station, wherein the base station control device is configured to perform the traffic according to the traffic for the first frequency. Cellularity characterized by including control means for changing and controlling the second reception quality measurement condition Beam can be obtained.

  According to the present invention, a mobile station, first and second base stations, and a base station controller are included, and the mobile station and the first base station set up a line using a first frequency. The mobile station and the second base station communicate with each other by setting a line using a second frequency, and the mobile station sets the line with the first base station. The first reception quality of the first frequency and the second reception quality of the second frequency are controlled to measure the second reception quality and the first reception during communication. A cellular system that controls communication by switching a line to the second base station when a difference from quality is a predetermined threshold value or more, wherein the base station controller measures traffic for a first frequency And a means for changing and controlling the predetermined threshold according to the traffic. Cellular system is obtained and symptoms.

  According to the present invention, a mobile station, first and second base stations, and a base station controller are included, and the mobile station and the first base station set up a line using a first frequency. The mobile station and the second base station perform communication by setting a line using a second frequency, and the mobile station sets the line with the first base station. When the second reception quality of the second frequency is controlled to be measured during communication and the second reception quality is equal to or higher than a predetermined threshold, the line is switched to the second base station. A cellular system that controls to perform communication, wherein the base station controller includes means for measuring traffic for the first frequency and changing and controlling the predetermined threshold according to the traffic. A cellular system is obtained.

  According to the present invention, a mobile station, first and second base stations, and a base station controller are included, and the mobile station and the first base station set up a line using a first frequency. The mobile station and the second base station perform communication by setting a line using a second frequency, and the mobile station sets the line with the first base station. During the communication, the first reception quality of the first frequency is controlled to be measured, the second reception quality of the second frequency is measured according to the first reception quality, and the second reception quality is measured. According to the reception quality of the cellular system for controlling the communication by switching the line to the second base station, wherein the base station control device is configured to control the second base station according to the transmission rate for the mobile station. A cellular system comprising means for changing and controlling reception quality measurement conditions with respect to frequency Obtained.

  According to the present invention, a mobile station, first and second base stations, and a base station controller are included, and the mobile station and the first base station set up a line using a first frequency. The mobile station and the second base station perform communication by setting a line using a second frequency, and the mobile station sets the line with the first base station. The second reception quality and the first reception quality are controlled so as to measure the first reception quality of the first frequency and the second reception quality of the second frequency during communication. Is a cellular system that controls communication by switching the line to the second base station when the difference is equal to or greater than a predetermined threshold value, wherein the base station control device, according to the transmission rate for the mobile station, A cellular system characterized by including means for changing and controlling the predetermined threshold value can be obtained.

  According to the present invention, a mobile station, first and second base stations, and a base station controller are included, and the mobile station and the first base station set up a line using a first frequency. The mobile station and the second base station communicate with each other by setting a line using a second frequency, and the mobile station sets the line with the first base station. When the second reception quality of the second frequency is controlled during communication and the second reception quality is equal to or higher than a predetermined threshold, a line is connected to the second base station. A cellular system for controlling to perform communication by switching between, wherein the base station control device includes means for changing and controlling the predetermined threshold according to a transmission rate for the mobile station Is obtained.

  According to the present invention, a mobile station, first and second base stations, and a base station controller are included, and the mobile station and the first base station set up a line using a first frequency. The mobile station and the second base station communicate with each other by setting a line using a second frequency, and the mobile station sets the line with the first base station. And measuring the first reception quality of the first frequency during the communication, and measuring the second reception quality of the second frequency according to the first reception quality, A base station controller in a cellular system configured to perform communication by switching a line to a second base station according to the second reception quality, and according to traffic for the first frequency, A base station system comprising control means for changing and controlling the second reception quality measurement condition Device is obtained.

  According to the present invention, a mobile station, first and second base stations, and a base station controller are included, and the mobile station and the first base station set up a line using a first frequency. The mobile station and the second base station communicate with each other by setting a line using a second frequency, and the mobile station sets the line with the first base station. The first reception quality of the first frequency and the second reception quality of the second frequency are controlled to measure the second reception quality and the first reception during communication. A base station controller in a cellular system that controls communication by switching the line to the second base station when the difference from the quality is equal to or greater than a predetermined threshold, measuring traffic to the first frequency; Means for changing and controlling the predetermined threshold according to the traffic. Base station controller according to symptoms can be obtained.

  According to the present invention, a mobile station, first and second base stations, and a base station controller are included, and the mobile station and the first base station set up a line using a first frequency. The mobile station and the second base station perform communication by setting a line using a second frequency, and the mobile station sets the line with the first base station. When the second reception quality of the second frequency is controlled to be measured during communication and the second reception quality is equal to or higher than a predetermined threshold, the line is switched to the second base station. A base station control apparatus in a cellular system that controls to perform communication, comprising: means for measuring traffic with respect to the first frequency, and changing and controlling the predetermined threshold according to the traffic A base station controller is obtained.

  According to the present invention, a mobile station, first and second base stations, and a base station controller are included, and the mobile station and the first base station set up a line using a first frequency. The mobile station and the second base station perform communication by setting a line using a second frequency, and the mobile station sets the line with the first base station. During the communication, the first reception quality of the first frequency is controlled to be measured, the second reception quality of the second frequency is measured according to the first reception quality, and the second reception quality is measured. A base station controller in a cellular system that controls communication by switching the line to the second base station according to the reception quality of the second base station, and for the second frequency according to the transmission rate for the mobile station Base station control apparatus comprising means for changing and controlling reception quality measurement condition Obtained.

  According to the present invention, a mobile station, first and second base stations, and a base station controller are included, and the mobile station and the first base station set up a line using a first frequency. The mobile station and the second base station perform communication by setting a line using a second frequency, and the mobile station sets the line with the first base station. The second reception quality and the first reception quality are controlled so as to measure the first reception quality of the first frequency and the second reception quality of the second frequency during communication. A base station control apparatus in a cellular system that controls communication by switching a line to a second base station when a difference between the second base station and the second base station is equal to or greater than a predetermined threshold, Thus, a base station control apparatus including means for changing and controlling the threshold value is obtained.

  According to the present invention, a mobile station, first and second base stations, and a base station controller are included, and the mobile station and the first base station set up a line using a first frequency. The mobile station and the second base station communicate with each other by setting a line using a second frequency, and the mobile station sets the line with the first base station. When the second reception quality of the second frequency is controlled during communication and the second reception quality is equal to or higher than a predetermined threshold, a line is connected to the second base station. A base station control apparatus in a cellular system that controls to perform communication by switching between, and includes means for changing and controlling the predetermined threshold according to a transmission rate for the mobile station Is obtained.

  According to the present invention, by distributing the different frequency switching control load according to the traffic and the transmission rate, it is possible to obtain an effect of reducing an unnecessary control amount and reducing a line cutoff probability.

  The first embodiment of the present invention will be described below with reference to the drawings. 7 and 8 used in the description of the technology related to the present invention are also applied to the cellular system using the code division multiple access system according to the first embodiment of the present invention. Referring to these drawings, FIG. 7 is a diagram showing a configuration diagram of a cellular system when two carriers are used in the same service area. FIG. 8 is a diagram showing a carrier frequency allocation diagram in the uplink and downlink.

  In FIG. 7, the mobile station 30 can connect a line with the base stations 10, 11, 20, and 21. The carriers used by the mobile station 30 on the line with the base stations 10 and 11 are assumed to use the carrier 101 and the carrier 103 respectively on the uplink and downlink in FIG. Similarly, in FIG. 7, the carrier used by the mobile station 30 on the line with the base stations 20 and 21 is assumed to use the carrier 102 and the carrier 104 on the uplink and downlink in FIG.

  In addition, the base station controller 60 controls whether the mobile station 30 is connected to the base stations 10 and 11 during communication or whether to connect to the base stations 20 and 21 and the different frequency switching control for connection. Shall be. The base station controller 60 has a function of measuring traffic with respect to individual carrier frequencies. According to the traffic measurement result, connection restriction control for a new subscriber line and traffic to an already connected mobile station are performed. Control to reduce the transmission rate for lowering. Note that transmission power control is applied to the uplink and downlink.

  The different frequency measurement in the mobile station 30 is performed by compressing downlink transmission data in time by a method of lowering a spreading factor or a method of raising a coding rate by not transmitting a part of encoded data. Create free time of data, and measure using this free time of data.

  1, 2 and 3 schematically show the configurations of the base station control device, the base station, and the mobile station in the first embodiment of the present invention. In FIG. 1, a base station control device 600 includes an input terminal 601 that receives a signal from one or a plurality of base stations, a reception processing unit 602 that processes a received signal, a control signal from a mobile station, or a base station. A control unit 603 that performs control based on the control unit, a transmission processing unit 604, an output terminal 605 that transmits a signal to one or a plurality of base stations, and a control signal from the control unit 603 to receive different frequency measurement and different frequency switching It is comprised from the different frequency switching control part 606 which performs judgment.

  The control unit 603 performs control related to channel setting between the mobile station and the base station, measures the transmission rate of the mobile station, measures traffic with respect to the carrier frequency, and avoids degradation of channel quality due to high traffic. Connection restriction control for a new subscriber line and transmission rate reduction control for an already connected mobile station.

  The different frequency switching control unit 606 performs different frequency measurement from the mobile station, receives a control signal for request for different frequency switching control, and performs different frequency measurement for the base station in a line connection state with the mobile station. Then, a data idle time creation and frequency switching control signal of the individual channel is transmitted.

  Also, the different frequency switching control unit 606 receives the information on the reception quality of the carrier frequency of the mobile station from the control unit 603, and determines the different frequency switching according to the information. Further, the different frequency switching control unit 606 receives a control signal related to the measurement of the transmission power of the base station, determines the different frequency measurement switching, and uses the carrier frequency traffic information measured by the control unit 603, Judge the different frequency switching control. Furthermore, the different frequency switching control unit 606 uses the information on the transmission rate of the mobile station measured by the control unit 603 to determine the different frequency switching control.

  In FIG. 2, a base station 700 includes an antenna 701 that transmits / receives signals to / from one or a plurality of mobile stations, a transmission / reception duplexer 702 that performs high-frequency processing on transmission signals and reception signals, and reception processing that performs signal reception processing. Unit 703, a control unit 704 that performs control using information from an input terminal 711 that receives a control signal transmitted from base station controller 600, and control information in control unit 704 is transmitted to base station controller 600. An output terminal 710 for transmitting data, an output terminal 705 for outputting received data, an input terminal 706 for receiving transmission data, a multiplexer (MUX) 707 for combining transmission data and a control signal, and transmission processing for performing transmission data processing Part 708.

  The transmission / reception duplexer 702 receives a frequency switching control signal from the control unit 704 and performs frequency switching used for transmission or reception. The control unit 704 measures the reception quality of the received signal by the reception processing unit 703, performs transmission power control on the mobile station, and performs transmission / reception control of the base station based on the control signal received from the base station control device 600. I do. Further, the control unit 704 receives a control signal for switching different frequencies from the base station control device 600 and transmits a control signal for switching frequencies used for transmission or reception to the transmission / reception duplexer 702.

  Furthermore, the control unit 704 receives a control signal for switching between different frequencies from the base station control apparatus 600, transmits a control signal for creating a data idle time of the dedicated channel to the transmission / reception duplexer 702, and 700 has a function of receiving a control signal related to transmission power measurement from the base station controller 600 and measuring the transmission power. Further, the control unit 704 has a function of transmitting a signal related to the measurement result of the transmission power of the base station 700 to the base station control device 600.

  In FIG. 3, a mobile station 800 includes an antenna 801 that transmits / receives a signal to / from one or a plurality of base stations, a transmission / reception duplexer 802 that performs high-frequency processing on a transmission signal and a reception signal, and a reception process that performs signal reception processing Unit 803, output terminal 805 that outputs transmission data, control unit 804 that performs control based on a control signal from reception processing unit 803, input terminal 806 that receives transmission data, and control unit 804. It comprises a multiplexer (MUX) 807 that combines the control signal and transmission data input from the input terminal 806, and a transmission processing unit 808 that performs transmission data processing.

  The control unit 804 periodically measures the perch channel transmitted from the base station 700 from the reception processing unit 803, performs processing for transmitting information related to the measurement result to the base station control device 600, and receives processing. The quality of the received signal received by unit 803 is measured, and a transmission power control signal is generated for one or more base stations. Furthermore, the control unit 804 performs transmission power control from control information received from one or a plurality of base stations.

  The operation that forms the basis of the first embodiment of the present invention is performed by the different frequency switching control unit 606. FIG. 4 is a flowchart showing the operation of the different frequency switching control unit 606 in the first embodiment of the present invention. Hereinafter, the operation in the control in the different frequency switching control unit 606 will be described with reference to FIG.

  In FIG. 4, step 150 indicates the start time of the different frequency switching control in the frequency switching control unit 606. In step 151, the flag indicating the different frequency measurement OFF mode is set to 0 (Flag = 0). Flag = 1 indicates the different frequency measurement ON mode. In step 152, the measurement result of the currently used carrier frequency traffic (Tr_1) is received, and in step 153, the value of the determination threshold Th_HO_Quality in equation (2) is changed according to Tr_1.

  Specifically, the change of Th_HO_Quality in step 153 is to reduce the Th_HO_Quality and increase the probability of switching between different frequencies when the carrier frequency traffic (Tr_1) currently in use is high. On the other hand, when the carrier frequency traffic (Tr_1) currently in use is low, Th_HO_Quality is increased, and the probability of different frequency switching is decreased.

  Subsequently, in step 154, the value of the determination threshold Th_HO_Quality in Expression (2) corresponding to the transmission rate is changed. Specifically, the change of Th_HO_Quality in step 154 lowers the Th_HO_Quality and increases the probability of different frequency switching when the transmission rate for the mobile station is high. On the other hand, when the transmission rate for the mobile station is low, Th_HO_Quality is increased and the probability of different frequency switching is decreased.

  After step 154, in step 155, a condition is determined for a flag (Flag) indicating ON / OFF of different frequency measurement. If Flag = 0 in step 155, whether or not conditional expression (4) indicating the start condition of the different frequency measurement is satisfied in step 156 using the reception quality measurement result of the currently used carrier frequency is determined. Make a decision. If the condition determination in step 156 is not satisfied, the process returns to step 152. If the condition determination in step 156 is satisfied, the flag is set to 1 in step 157, and the mobile station is instructed to measure the reception quality Q_2 of the different frequency switching destination in step 158.

  If the condition determination in step 155 is satisfied, in step 158, the mobile station is instructed to measure the reception quality Q_2 of the different frequency switching destination. After step 158, the condition of equation (2) is determined in step 159. If the condition determination in step 159 is not satisfied, the condition determination of equation (5) is performed in step 160.

  If the condition determination in step 160 is not satisfied, the process returns to step 152. If the condition determination in step 160 is satisfied, the mobile station is instructed to stop the measurement of the reception quality Q_2 of the different frequency switching destination in step 161, and then the process returns to step 151. If the condition determination in step 159 is satisfied, the mobile station is instructed to stop the measurement of the reception quality Q_2 of the different frequency switching destination in step 162, and then the different frequency switching control is started (step 170).

  In step 153, when the traffic of the carrier frequency currently in use is low, the different frequency measurement may not be performed. This is equivalent to setting the value of the determination threshold Th_HO_Quality in Expression (2) to + ∞. Note that step 154 is skipped when this control is performed.

  The first embodiment of the present invention is characterized in that the determination threshold Th_HO_Quality in the equation (2) is changed according to the traffic of the carrier frequency currently in use as shown in Step 153 of FIG. When the traffic with respect to the carrier frequency currently in use is high, the line blocking probability can be reduced by lowering the determination threshold Th_HO_Quality in Equation (2) and increasing the probability of different frequency switching. On the other hand, when the carrier frequency traffic currently in use is low, the judgment threshold Th_HO_Quality in equation (2) is increased, and the probability of different frequency switching is reduced, thereby reducing the different frequency switching control load. Can do.

  In addition, the first embodiment of the present invention is characterized in that the determination threshold Th_HO_Quality in Expression (2) is changed according to the transmission rate of the mobile station as shown in Step 154 of FIG. Of the mobile stations connected to the carrier frequency, the higher the transmission rate, the larger the occupied bandwidth, the higher the line cutoff rate. In this case, the line blocking probability can be reduced by lowering the determination threshold Th_HO_Quality in Expression (2) and increasing the probability of different frequency switching. On the other hand, since a mobile station with a lower transmission rate of the mobile station occupies a smaller band, the line cutoff rate is smaller than that of a mobile station with a higher transmission rate. In this case, the different frequency switching control load can be reduced by increasing the determination threshold Th_HO_Quality in Equation (2) and reducing the probability of different frequency switching.

  The effect of this first embodiment is that the determination threshold used in different frequency switching is changed according to the carrier frequency traffic, and in the case of high traffic where the line blocking probability is high, the frequency of executing different frequency switching. In the case of low traffic where the line blocking probability is lowered by increasing the frequency, and the line blocking probability is lowered, the different frequency switching control load is reduced by reducing the frequency of performing different frequency switching.

  In addition, the effect of the first embodiment is that the determination threshold used in different frequency switching is changed according to the transmission rate of the mobile station. In the case of a low transmission rate that lowers the probability of line interruption and lowers the probability of line interruption, the load for controlling different frequency switching is reduced by reducing the frequency of execution of different frequency switching. In the point.

  The second embodiment of the present invention will be described below. These are the cellular system using the code division multiple access scheme shown in FIGS. 7 and 8, and the base station control shown in FIGS. And the operation | movement which makes the basis of this 2nd embodiment is also performed in the different frequency switching control part 606 in a base station control apparatus.

  FIG. 5 is a flowchart showing the operation of the different frequency switching control unit 606 in the second embodiment of the present invention. Hereinafter, the operation in the control in the different frequency switching control unit 606 will be described with reference to FIG.

  In FIG. 5, step 250 indicates the start time of the different frequency switching control in the frequency switching control unit 606. In step 251, the flag indicating the different frequency measurement OFF mode is set to 0 (Flag = 0). Flag = 1 indicates the different frequency measurement ON mode. In step 252, the measurement result of the traffic (Tr_1) of the carrier frequency currently in use is received. In step 253, the values of the determination threshold values Th_Start and Th_End in equations (4) and (5) are changed according to Tr_1. .

  Specifically, the change in Th_Start and Th_End in step 253 is to increase the probability of switching between different frequencies by lowering Th_Start and Th_End when the carrier frequency traffic (Tr_1) currently in use is high. On the other hand, when the carrier frequency traffic (Tr_1) currently in use is low, Th_Start and Th_End are increased, and the probability of switching between different frequencies is decreased. Note that Th_Start and Th_End satisfy the conditional expression (6).

  Subsequently, in step 254, the values of the determination threshold values Th_Start and Th_End in Expression (4) and Expression (5) are changed according to the transmission rate. Specifically, in the change of Th_Start and Th_End in step 254, when the transmission rate for the mobile station is high, Th_Start and Th_End are lowered, and the probability of different frequency switching is increased. On the other hand, when the transmission rate for the mobile station is low, Th_Start and Th_End are increased, and the probability of different frequency switching is decreased. Note that Th_Start and Th_End satisfy the conditional expression (6).

  After step 254, in step 255, a condition is determined for a flag (Flag) indicating ON / OFF of different frequency measurement. If Flag = 0 in Step 255, whether or not conditional expression (4) indicating the start condition of the different frequency measurement is satisfied in Step 256 using the reception quality measurement result of the currently used carrier frequency is determined. Make a decision. If the condition determination in step 256 is not satisfied, the process returns to step 252. If the condition determination in step 256 is satisfied, the flag is set to 1 in step 257, and the mobile station is instructed to measure the reception quality Q_2 of the different frequency switching destination in step 258. If the condition determination in step 255 is satisfied, in step 258, the mobile station is instructed to measure the reception quality Q_2 of the different frequency switching destination.

  After step 258, the condition of equation (2) is determined in step 259. If the condition determination in step 259 is not satisfied, the condition determination of equation (5) is performed in step 260. If the condition determination in step 260 is not satisfied, the process returns to step 252. If the condition determination in step 260 is satisfied, the mobile station is instructed in step 261 to stop the measurement of the reception quality Q_2 of the different frequency switching destination. Thereafter, the process returns to step 251. If the condition determination at step 259 is satisfied, the mobile station is instructed to stop the measurement of the reception quality Q_2 of the different frequency switching destination at step 262, and then the different frequency switching control is started (step 270).

  In step 253, when the traffic of the carrier frequency currently in use is low, the different frequency measurement may not be performed. This is equivalent to setting the determination threshold values Th_Start and Th_End in Expressions (4) and (5) to −∞. Note that step 254 is skipped when this control is performed.

  In the second embodiment of the present invention, as shown in Step 253 of FIG. 5, the determination thresholds Th_Start and Th_End in Expression (4) and Expression (5) are changed according to the traffic of the carrier frequency currently in use. Characterized by points. Specifically, when the traffic for the carrier frequency currently in use is high, the determination threshold values Th_Start and Th_End in Equations (4) and (5) are lowered, and the probability of switching between different frequencies is increased. Therefore, it is possible to reduce the line interruption probability. On the other hand, when the traffic of the carrier frequency currently in use is low, the thresholds Th_Start and Th_End in Equation (4) and Equation (5) are increased, and the probability of different frequency switching is lowered. The frequency switching control load can be reduced.

  Further, in the second embodiment of the present invention, as shown in Step 254 of FIG. 5, the determination thresholds Th_Start and Th_End in Expression (4) and Expression (5) are changed according to the transmission rate of the mobile station. Also has features. Of the mobile stations connected to the carrier frequency, the higher the transmission rate, the larger the occupied bandwidth, the higher the line cutoff rate. In this case, the line blocking probability can be reduced by lowering the values of the determination thresholds Th_Start and Th_End in the expressions (4) and (5) and increasing the probability of different frequency switching. On the other hand, since a mobile station with a lower transmission rate of the mobile station occupies a smaller band, the line cutoff rate is smaller than that of a mobile station with a higher transmission rate. In this case, the different frequency switching control load can be reduced by increasing the values of the determination thresholds Th_Start and Th_End in the equations (4) and (5) and lowering the probability of different frequency switching.

  The effect of this second embodiment is that the determination threshold used in different frequency switching is changed according to the carrier frequency traffic, and in the case of high traffic where the line blocking probability is high, the frequency of executing different frequency switching. In the case of low traffic where the line blocking probability is lowered by increasing the frequency, and the line blocking probability is lowered, the different frequency switching control load is reduced by reducing the frequency of performing different frequency switching.

  In addition, the effect of the second embodiment is that the determination threshold used in different frequency switching is changed according to the transmission rate of the mobile station, and the line blocking probability is increased. By increasing the switching execution frequency, the line blocking probability is reduced and the line blocking probability is lowered.In the case of a low transmission rate, the frequency switching control load is reduced by reducing the frequency of executing different frequency switching. It is in the point to reduce.

  The third embodiment of the present invention will be described below. The configuration of the cellular system using the code division multiple access method shown in FIGS. 7 and 8 and the base station controller, base station, and mobile station shown in FIGS. 1, 2, and 3 is the same as that of the third embodiment. The same applies to. And the operation | movement which makes the basis of this 3rd embodiment is also performed in the different frequency switching control part 606 in a base station control apparatus.

  FIG. 6 is a flowchart showing the operation of the different frequency switching control unit 606 in the third embodiment of the present invention. Hereafter, the operation | movement in the control in the different frequency switching control part 606 is shown using FIG. In FIG. 6, step 350 indicates the start time of the different frequency switching control in the frequency switching control unit 606. In step 351, the measurement result of the traffic (Tr_1) of the carrier frequency currently in use is received, and a different frequency switching request is determined according to the traffic (Tr_1) (step 352).

  If it is determined in step 352 that a different frequency switching request is not required, the process returns to step 351. If it is determined in step 352 that a different frequency switching request is necessary, the determination threshold Th_HO_Load in equation (3) is changed according to traffic (Tr_1) (step 353). Specifically, the change of Th_HO_Load in step 353 is such that, when the carrier frequency traffic (Tr_1) currently in use is high, Th_HO_Load is lowered and the probability of switching between different frequencies is increased. On the other hand, if the carrier frequency traffic (Tr_1) currently in use is low, Th_HO_Load is increased, and the probability of switching between different frequencies is decreased.

  In step 354 after step 353, the value of the determination threshold Th_HO_Load in equation (3) is changed according to the transmission rate of the mobile station. Specifically, the change of Th_HO_Load in step 354 is such that when the transmission rate is high, Th_HO_Load is lowered and the probability of different frequency switching is increased. On the other hand, when the transmission rate is low, Th_HO_Load is increased and the probability of different frequency switching is decreased.

  After step 354, in step 355, the mobile station is instructed to measure the reception quality Q_2 of the carrier frequency to which the different frequency is switched. In step 356, the condition of equation (3) is determined. If the condition in step 356 is not satisfied, the process returns to step 351. If the condition in step 356 is satisfied, in step 357, the mobile station is instructed to stop the measurement of the reception quality Q_2 of the carrier frequency of the different frequency switching destination, and then the different frequency switching is started (step 370).

  The third embodiment of the present invention is characterized in that, as shown in Step 353 of FIG. 6, the determination threshold Th_Load in Expression (3) is changed according to the traffic of the carrier frequency currently in use. Specifically, when the traffic with respect to the carrier frequency currently in use is high, it is possible to reduce the line blocking probability by lowering the determination threshold Th_HO_Load in the equation (3) and increasing the probability of different frequency switching. . On the other hand, when the carrier frequency traffic currently in use is low, the judgment threshold Th_HO_Load in equation (3) is increased, and the probability of different frequency switching is reduced, thereby reducing the different frequency switching control load. Can do.

  Further, the third embodiment of the present invention is characterized in that the determination threshold Th_HO_Load in Expression (3) is changed according to the transmission rate of the mobile station, as shown in Step 354 of FIG. Of the mobile stations connected to the carrier frequency, the higher the transmission rate, the larger the occupied bandwidth, the higher the line cutoff rate. In this case, the line blocking probability can be reduced by lowering the determination threshold Th_HO_Load in Expression (3) and increasing the probability of different frequency switching. On the other hand, since a mobile station with a lower transmission rate of the mobile station occupies a smaller band, the line cutoff rate is smaller than that of a mobile station with a higher transmission rate. In this case, the different frequency switching control load can be reduced by increasing the determination threshold Th_HO_Load in Equation (3) and decreasing the probability of different frequency switching.

  The effect of this third embodiment is that the decision threshold used in different frequency switching is changed according to the carrier frequency traffic, and the line blocking probability is increased. In the case of high traffic, the different frequency switching is executed. By increasing the frequency, the probability of line interruption is reduced, and the probability of line interruption is reduced. In the case of low traffic, the frequency of control for different frequency switching is reduced by reducing the frequency of execution of different frequency switching. is there.

  Further, the effect of the third embodiment is that the determination threshold used in different frequency switching is changed according to the transmission rate of the mobile station, and the line blocking probability is increased. By increasing the switching execution frequency, the line blocking probability is reduced and the line blocking probability is lowered.In the case of a low transmission rate, the frequency switching control load is reduced by reducing the frequency of executing different frequency switching. It is in the point to reduce.

It is a block diagram which shows the structure of the base station control apparatus by 1st-3rd embodiment of this invention. It is a block diagram which shows the structure of the base station by 1st-3rd embodiment of this invention. It is a block diagram which shows the structure of the mobile station by 1st-3rd embodiment of this invention. It is a flowchart which shows operation | movement of the base station control apparatus by 1st embodiment of this invention. It is a flowchart which shows operation | movement of the mobile station by 2nd embodiment of this invention. 7 is a flowchart illustrating an operation of a mobile station according to the third embodiment of the present invention. It is a figure which shows the structure of the cellular system using a code division multiple access system. It is a figure for demonstrating the carrier arrangement | sequence in the cellular system using the code division multiple access system of FIG. It is a figure which shows the waveform of the time change of reception quality.

Explanation of symbols

40, 41 perch channel
50, 51 Downlink dedicated channel
70, 71 Uplink dedicated channel
101-104 carrier frequency
600 Base station controller
700 base station
800 Mobile station 601,706,711,806 Input terminal 605,705,710,805 Output terminal
602, 703, 803 reception processing unit
604, 708, 808 transmission processing unit
603, 704, 804 control unit
701, 801 Transmitting and receiving antenna
702, 802 Transmission / reception duplexer
707, 807 multiplexer
606 Different frequency switching control unit

Claims (32)

A mobile station, first and second base stations, and a base station controller,
The mobile station and the first base station communicate by setting a line using a first frequency,
The mobile station and the second base station communicate by setting a line using a second frequency,
The mobile station measures the first reception quality of the first frequency while setting up a line with the first base station and performing communication, and according to the first reception quality, Controlled to measure the second received quality of the second frequency,
According to the second reception quality, a line control method in a cellular system configured to perform communication by switching a line to a second base station,
The line control method comprising the step of changing and controlling the second reception quality measurement condition in accordance with traffic for the first frequency in the base station controller.   The measurement condition for measuring the second reception quality is when the first reception quality is less than a predetermined threshold. In the step of changing and controlling the measurement condition, the predetermined threshold is set according to the traffic. 2. The line control method according to claim 1, wherein change control is performed. A mobile station, first and second base stations, and a base station controller,
The mobile station and the first base station communicate by setting a line using a first frequency,
The mobile station and the second base station communicate by setting a line using a second frequency,
The mobile station measures the first reception quality of the first frequency and the second reception quality of the second frequency while communicating with the first base station by setting a line. Controlled and
A line control method in a cellular system for controlling communication by switching a line to the second base station when a difference between the second reception quality and the first reception quality is a predetermined threshold value or more. ,
The line control method, comprising: a step of measuring traffic for a first frequency in the base station controller and changing and controlling the predetermined threshold according to the traffic.   The base station control device includes a step of controlling the mobile station not to measure the second reception quality when the traffic is outside a predetermined range. The line control method according to any one of? A mobile station, first and second base stations, and a base station controller,
The mobile station and the first base station communicate by setting a line using a first frequency,
The mobile station and the second base station communicate by setting a line using a second frequency,
The mobile station is controlled to measure the second reception quality of the second frequency while performing communication by setting up a line with the first base station,
When the second reception quality is equal to or higher than a predetermined threshold, a line control method in a cellular system that controls communication by switching the line to the second base station,
The line control method comprising the step of measuring traffic for the first frequency in the base station controller and changing and controlling the predetermined threshold according to the traffic. A mobile station, first and second base stations, and a base station controller,
The mobile station and the first base station communicate by setting a line using a first frequency,
The mobile station and the second base station communicate by setting a line using a second frequency,
The mobile station is controlled to measure the first reception quality of the first frequency while performing communication by setting up a line with the first base station,
A cellular device that measures the second reception quality of the second frequency according to the first reception quality and controls the communication to be switched to the second base station according to the second reception quality. A line control method in a system,
The line control method, comprising: a step of changing and controlling a reception quality measurement condition for the second frequency in accordance with a transmission rate for the mobile station in the base station controller.   The base station controller instructs the mobile station to measure the second reception quality when the first reception quality is less than a predetermined threshold, and transmits the predetermined threshold to the transmission 7. The line control method according to claim 6, further comprising a step of performing change control according to a rate. A mobile station, first and second base stations, and a base station controller,
The mobile station and the first base station communicate by setting a line using a first frequency,
The mobile station and the second base station communicate by setting a line using a second frequency,
The mobile station measures the first reception quality of the first frequency and the second reception quality of the second frequency while communicating with the first base station by setting a line. Controlled,
A line control method in a cellular system for controlling to perform communication by switching a line to a second base station when a difference between the second reception quality and the first reception quality is equal to or greater than a predetermined threshold,
The line control method comprising the step of changing and controlling the predetermined threshold according to a transmission rate for the mobile station in the base station controller. A mobile station, first and second base stations, and a base station controller,
The mobile station and the first base station communicate by setting a line using a first frequency,
The mobile station and the second base station communicate by setting a line using a second frequency,
The mobile station is controlled to measure a second reception quality of the second frequency while performing communication by setting up a line with the first base station;
When the second reception quality is equal to or higher than a predetermined threshold, a line control method in a cellular system that controls communication by switching the line to the second base station,
The line control method comprising the step of changing and controlling the predetermined threshold according to a transmission rate for the mobile station in the base station controller.   10. The line control method according to claim 1, wherein the first and second base stations transmit a perch channel, and the reception quality is a reception quality of the perch channel. In the first base station, the transmission data is temporally compressed and transmitted, and a free time for interrupting data transmission is provided;
The line control method according to claim 1, further comprising: measuring a second reception quality in the idle time in the mobile station. A mobile station, first and second base stations, and a base station controller,
The mobile station and the first base station communicate by setting a line using a first frequency,
The mobile station and the second base station communicate by setting a line using a second frequency,
The mobile station measures the first reception quality of the first frequency while setting up a line with the first base station and performing communication, and determines the second reception according to the first reception quality. Controlled to measure the second received quality of the frequency of
In accordance with the second reception quality, a cellular system configured to perform communication by switching a line to a second base station,
The cellular system according to claim 1, wherein the base station control device includes control means for changing and controlling the measurement condition of the second reception quality in accordance with traffic with respect to the first frequency.   The measurement condition for measuring the second reception quality is that the first reception quality is less than a predetermined threshold value, and the control means changes and controls the predetermined threshold value according to the traffic. The cellular system according to claim 12, characterized in that: A mobile station, first and second base stations, and a base station controller,
The mobile station and the first base station communicate by setting a line using a first frequency,
The mobile station and the second base station communicate by setting a line using a second frequency,
The mobile station measures the first reception quality of the first frequency and the second reception quality of the second frequency while communicating with the first base station by setting a line. Controlled and
A cellular system that controls communication by switching a line to the second base station when a difference between the second reception quality and the first reception quality is a predetermined threshold value or more,
The cellular system comprising: means for measuring traffic for a first frequency and changing and controlling the predetermined threshold according to the traffic.   13. The base station controller includes means for controlling the mobile station not to measure the second reception quality when the traffic is outside a predetermined range. The cellular system in any one of -14. A mobile station, first and second base stations, and a base station controller,
The mobile station and the first base station communicate by setting a line using a first frequency,
The mobile station and the second base station communicate by setting a line using a second frequency,
The mobile station is controlled to measure the second reception quality of the second frequency while performing communication by setting up a line with the first base station,
When the second reception quality is equal to or higher than a predetermined threshold, a cellular system that controls communication by switching the line to the second base station,
The cellular system comprising: means for measuring the traffic for the first frequency, and changing and controlling the predetermined threshold according to the traffic. A mobile station, first and second base stations, and a base station controller,
The mobile station and the first base station communicate by setting a line using a first frequency,
The mobile station and the second base station communicate by setting a line using a second frequency,
The mobile station is controlled to measure the first reception quality of the first frequency while performing communication by setting up a line with the first base station,
A cellular device that measures the second reception quality of the second frequency according to the first reception quality and controls the communication to be switched to the second base station according to the second reception quality. A system,
The cellular station control device includes means for changing and controlling reception quality measurement conditions for the second frequency according to a transmission rate for the mobile station.   The base station controller instructs the mobile station to measure the second reception quality when the first reception quality is less than a predetermined threshold, and transmits the predetermined threshold to the transmission 18. The cellular system according to claim 17, further comprising means for controlling change according to a rate. A mobile station, first and second base stations, and a base station controller,
The mobile station and the first base station communicate by setting a line using a first frequency,
The mobile station and the second base station communicate by setting a line using a second frequency,
The mobile station measures the first reception quality of the first frequency and the second reception quality of the second frequency while communicating with the first base station by setting a line. Controlled,
A cellular system that controls communication by switching a line to a second base station when a difference between the second reception quality and the first reception quality is a predetermined threshold value or more,
The cellular system according to claim 1, wherein the base station controller includes means for changing and controlling the predetermined threshold according to a transmission rate for the mobile station. A mobile station, first and second base stations, and a base station controller,
The mobile station and the first base station communicate by setting a line using a first frequency,
The mobile station and the second base station communicate by setting a line using a second frequency,
The mobile station is controlled to measure a second reception quality of the second frequency while performing communication by setting up a line with the first base station;
When the second reception quality is equal to or higher than a predetermined threshold, a cellular system that controls communication by switching the line to the second base station,
The cellular system according to claim 1, wherein the base station controller includes means for changing and controlling the predetermined threshold according to a transmission rate for the mobile station.   The cellular system according to any one of claims 12 to 20, wherein the first and second base stations transmit a perch channel, and the reception quality is a reception quality of the perch channel. The first base station transmits the transmission data after compressing the transmission data, and provides a free time for interrupting data transmission;
The cellular system according to any one of claims 12 to 21, wherein the mobile station includes means for measuring a second reception quality in the idle time. A mobile station, first and second base stations, and a base station controller,
The mobile station and the first base station communicate by setting a line using a first frequency,
The mobile station and the second base station communicate by setting a line using a second frequency,
The mobile station measures a first reception quality of the first frequency while setting up a line with the first base station and performing communication, and the first reception quality according to the first reception quality Controlled to measure the second received quality of the second frequency,
According to the second reception quality, a base station controller in a cellular system configured to perform communication by switching a line to a second base station,
A base station controller comprising control means for changing and controlling the measurement condition of the second reception quality in accordance with traffic for the first frequency.   The measurement condition for measuring the second reception quality is that the first reception quality is less than a predetermined threshold value, and the control means changes and controls the predetermined threshold value according to the traffic. The base station control device according to claim 23, characterized in that: A mobile station, first and second base stations, and a base station controller,
The mobile station and the first base station communicate by setting a line using a first frequency,
The mobile station and the second base station communicate by setting a line using a second frequency,
The mobile station measures the first reception quality of the first frequency and the second reception quality of the second frequency while communicating with the first base station by setting a line. Controlled and
A base station controller in a cellular system that controls communication by switching a line to the second base station when a difference between the second reception quality and the first reception quality is equal to or greater than a predetermined threshold. And
A base station control apparatus comprising: means for measuring traffic with respect to a first frequency, and changing and controlling the predetermined threshold according to the traffic. A mobile station, first and second base stations, and a base station controller,
The mobile station and the first base station communicate by setting a line using a first frequency,
The mobile station and the second base station communicate by setting a line using a second frequency,
The mobile station is controlled to measure the second reception quality of the second frequency while performing communication by setting up a line with the first base station,
When the second reception quality is equal to or higher than a predetermined threshold, a base station control device in a cellular system that controls communication by switching a line to a second base station,
A base station control apparatus comprising: means for measuring traffic with respect to the first frequency, and changing and controlling the predetermined threshold according to the traffic.   27. The base station control apparatus according to claim 26, further comprising means for controlling communication by switching a line to the second base station when the traffic is equal to or greater than a predetermined threshold. A mobile station, first and second base stations, and a base station controller,
The mobile station and the first base station communicate by setting a line using a first frequency,
The mobile station and the second base station communicate by setting a line using a second frequency,
The mobile station is controlled to measure the first reception quality of the first frequency while performing communication by setting up a line with the first base station,
A cellular device that measures the second reception quality of the second frequency according to the first reception quality and controls the communication to be switched to the second base station according to the second reception quality. A base station controller in the system,
A base station control apparatus comprising: means for changing and controlling reception quality measurement conditions for the second frequency in accordance with a transmission rate for the mobile station.   When the first reception quality is less than a predetermined threshold, the mobile station is instructed to measure the second reception quality, and the predetermined threshold is changed and controlled according to the transmission rate. 29. The base station control apparatus according to claim 28, further comprising: means. A mobile station, first and second base stations, and a base station controller,
The mobile station and the first base station communicate by setting a line using a first frequency,
The mobile station and the second base station communicate by setting a line using a second frequency,
The mobile station measures the first reception quality of the first frequency and the second reception quality of the second frequency while communicating with the first base station by setting a line. Controlled,
A base station control device in a cellular system for controlling communication by switching a line to a second base station when a difference between the second reception quality and the first reception quality is equal to or greater than a predetermined threshold. ,
A base station control apparatus comprising means for changing and controlling the predetermined threshold according to a transmission rate for the mobile station. A mobile station, first and second base stations, and a base station controller,
The mobile station and the first base station communicate by setting a line using a first frequency,
The mobile station and the second base station communicate by setting a line using a second frequency,
The mobile station is controlled to measure a second reception quality of the second frequency while performing communication by setting up a line with the first base station;
When the second reception quality is equal to or higher than a predetermined threshold, a base station control apparatus in a cellular system that controls communication by switching a line to the second base station,
A base station control apparatus comprising means for changing and controlling the predetermined threshold according to a transmission rate for the mobile station.   32. The base station control apparatus according to claim 23, wherein the reception quality is a reception quality of a perch channel transmitted from the first and second base stations.

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