JPH10200941A - Base station deciding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of time in which reception of base station data is disabled even if output of search request becomes necessary again by continuing output of a clock signal when both the search request and a clock activating signal are outputted. SOLUTION: When a receiving level of the base station data is not higher than a standard level, the base station data is judged to be improper as a base station of a mobile station and decision of the base station is attempted again by outputting the search request to a clock generating part 9 and a clock control part 22. However, since the clock generating part 9 is presently activated in this case, it is safe from generating an unstable clock signal like in start up and waiting for passage of a specified time is not required, the clock activating signal is outputted to the clock control part 22 so that the output of the clock signal is continued. Consequently, since passage of the clock signal is permitted without being prevented after the search request is received by the clock control part 22, the clock signal is continuously supplied to an RF/IF part 2, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base station determining apparatus for determining a base station of a mobile station (for example, a mobile phone or a PHS).

[0002]

2. Description of the Related Art FIG. 9 is a block diagram showing a conventional base station determining apparatus. In FIG. 9, reference numeral 1 denotes an antenna for receiving a high-frequency signal (base station data) transmitted from a base station; RF / IF unit for converting the obtained high-frequency signal into a baseband signal (base station data), and 3
The demodulation unit 4 demodulates the baseband signal (base station data) converted by the IF unit 2. The demodulation unit 4 matches the bit string of the baseband signal (base station data) demodulated by the demodulation unit 3 with a preset unique word. This is a unique word detection unit that identifies whether or not there is a bit string to be executed, and outputs a unique word detection signal when a bit string that matches the unique word exists.

A receiving buffer 5 stores the base station data demodulated by the demodulation unit 3 when a unique word detection signal is output from the unique word detection unit 4, and a reception buffer 5 stores a unique word detection signal from the unique word detection unit 4. When the signal is output, the CRC of the base station data is calculated, and the C
If the RC matches the CRC transmitted in the base station data, a CRC match signal is output.
A CRC calculation unit 7 that outputs a mismatch signal is an interrupt generation unit that outputs an interrupt signal when a CRC match signal is output from the CRC calculation unit 6.

[0004] Further, when a base station of a mobile station is determined, a search request is output, and when an interrupt signal is output from the interrupt generation unit 7, the base station data stored in the reception buffer 5 is output. To determine the base station that has transmitted the base station data as the base station of the mobile station
U and 9 receive a search request when the CPU 8 outputs a search request and a clock signal is output from the clock generation unit 9. Thereafter, the clock control unit blocks passage of the clock signal until a predetermined time elapses, and permits passage of the clock signal after the predetermined time elapses.

The clock signal passed through the clock control unit 10 is sent to the RF / IF unit 2, demodulation unit 3, unique word detection unit 4, reception buffer 5, CRC calculation unit 6, interrupt generation unit 7, and CPU 8, respectively. The RF / IF unit 2 and the like operate in synchronization with the clock signal. Also, CPU
When the clock signal output from the clock generator 9 is not supplied, the clock controller 8 and the clock controller 10 operate by receiving a low-speed clock generated by a crystal oscillator (not shown).

Next, the operation will be described. First, when there is a request from a mobile station for determination of a base station, the CPU 8
The clock generator 9 sends a search request for requesting a base station to be determined.
And outputs it to the clock control unit 10.

When a search request is output from the CPU 8, the clock generator 9 outputs a clock signal. However, when the clock generator 9 is composed of a TCXO or the like, the clock generator 9 is disabled for several milliseconds after the start. Since a stable clock signal is output, a malfunction may occur in the subsequent RF / IF unit 2 and the like. Therefore, in order to prevent such a problem, the clock control unit 10 blocks passage of the clock signal until a predetermined time elapses after receiving the search request from the CPU 8, and after the predetermined time elapses, the clock control unit 10 determines that the clock signal has not passed. Allow transit.

As described above, when the clock signal is output from the clock control unit 10, while the clock signal is being output, the RF / IF unit 2 and the like determine the base station in synchronization with the clock signal. Perform the operation of That is, R
The F / IF unit 2 converts a high-frequency signal (base station data) received by the antenna 1 into a baseband signal (base station data), and outputs the baseband signal to the demodulation unit 3.

When the baseband signal (base station data) is output from the RF / IF section 2, the demodulation section 3 demodulates the base station data and outputs it to the unique word detection section 4 and the like. Then, when the base station data is output from the demodulation unit 3, the unique word detection unit 4 identifies whether or not a bit sequence that matches a preset unique word exists in the bit sequence of the base station data, If there is a bit string that matches the unique word, a unique word detection signal is output to the reception buffer 5 and the CRC calculation unit 6. When the unique word detection unit 4 outputs the unique word detection signal, the unique word detection unit 4 temporarily stops the process of detecting the unique word until receiving the CRC mismatch signal from the CRC calculation unit 6.

When the unique word detection signal is output from the unique word detection unit 4, the reception buffer 5 uses the unique word detection signal as a trigger to generate a bit string after the unique word out of the bit strings constituting the base station data. Is stored. When the unique word detection signal is output from the unique word detection unit 4, the CRC calculation unit 6 checks the CRC of the base station data by using the unique word detection signal as a trigger to check for transmission errors in the base station data. calculate. If the CRC matches the CRC transmitted in the base station data,
It determines that there is no transmission error in the base station data, and outputs a CRC match signal to the interrupt generation unit 7. On the other hand, if they do not match, it is determined that there is a transmission error in the base station data and CR
The C mismatch signal is output to the unique word detection unit 4. As a result, the unique word detection unit 4 restarts the process of detecting a unique word.

[0011] Then, the interrupt generation unit 7 includes a CRC calculation unit 6
When a CRC match signal is output from the
8 is output. When receiving an interrupt signal from interrupt generating unit 7 after outputting the search request, CPU 8 executes a process of reading base station data from reception buffer 5, and the reception level of the base station data becomes lower than the reference level. When the base station data is high, the base station that transmitted the base station data is recognized from the identification code indicating the source base station included in the base station data, and the base station is determined as the base station of the mobile station. . On the other hand, if the reception level of the base station data is not higher than the reference level, it is determined that the mobile station is not appropriate as the base station, and a search request is output to the clock generator 9 and the like again, The same operation is repeated to try to determine a base station.

[0012]

Since the conventional base station determining apparatus is configured as described above, the base station can be determined when the reception level of the base station data is higher than the reference level. If it is not higher than the reference level, it is necessary to output a search request again and repeat the same operation. However, when the clock control unit 10 receives the search request, it blocks the passage of the clock signal until a predetermined time elapses. Even if the base station data is transmitted from the station (the base station transmits the base station data intermittently at a fixed period), the base station data cannot be received, and the base station is set to the base station of the mobile station. There was a problem that could not be determined as.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and it is possible to prevent the occurrence of a time in which reception of base station data becomes impossible even if it becomes necessary to output a search request again. It is an object of the present invention to obtain a base station determining apparatus capable of performing the above. Another object of the present invention is to provide a base station determining apparatus that can determine a base station suitable as a base station of a mobile station.

[0014]

According to the first aspect of the present invention, when a search request is output without outputting a clock-in-progress signal, a base station determining apparatus outputs a clock signal after a predetermined time has elapsed. On the other hand, when both the search request and the clock start signal are output, the output of the clock signal is continued.

In the base station determining apparatus according to the second aspect of the present invention, when there are a plurality of base station data having a reception level higher than the reference level, the reception levels of the respective base station data are compared with each other, and the reception level is the highest. A base station associated with high base station data is determined as a base station of a mobile station.

According to a third aspect of the present invention, when a unique word is detected by the detecting means, a base station identification code is extracted from the base station data where the unique word is detected, and the base station identification code is extracted. When the code matches the preset base station identification code, the base station related to the base station data is determined as the base station of the mobile station.

According to a fourth aspect of the present invention, when there are a plurality of base station data having the same base station identification code, the reception levels of the respective base station data are compared with each other, and the reception level is the highest. A base station associated with high base station data is determined as a base station of a mobile station.

According to a fifth aspect of the present invention, there is provided a base station determining apparatus, wherein a preset base station identification code includes an identification code of a self-service system.

According to a sixth aspect of the present invention, there is provided a base station determining apparatus wherein a preset base station identification code includes an identification code of a paging area in which a mobile station is registered.

The base station determining apparatus according to the present invention determines the base station without considering the identification code of the paging area when no base station data matching the identification code of the paging area is detected. It is like that.

According to the eighth aspect of the present invention, the unique word is detected from the base station data only when the reception level of the base station data is higher than the reference level.

In a ninth aspect of the present invention, when there are a plurality of base station data in which a unique word is detected, the reception levels of the respective base station data are compared with each other, and the highest reception level is obtained. The base station according to the base station data is determined as the base station of the mobile station.

According to a tenth aspect of the present invention, in determining a base station of a mobile station, the reference level is increased stepwise until a unique word is no longer detected by the detecting means. It is.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a block diagram showing a base station determining apparatus according to Embodiment 1 of the present invention. In the figure, reference numeral 1 denotes an antenna (detection means) for receiving a high-frequency signal (base station data) transmitted from a base station; Is a baseband signal (base station data) which is a high frequency signal received by the antenna 1
RF / IF unit (detection means) for converting to 3
A demodulation unit (detection means) 4 for demodulating the baseband signal (base station data) converted by the unit 2, and a unique bit preset in the bit string of the baseband signal (base station data) demodulated by the demodulation unit 3. A unique word detection unit (detection means) that identifies whether or not a bit string that matches the word exists, and outputs a unique word detection signal when a bit string that matches the unique word exists.

Reference numeral 5 denotes a reception buffer for storing the base station data demodulated by the demodulation unit 3 when the unique word detection signal is output from the unique word detection unit 4, and 6 denotes a unique word detection signal from the unique word detection unit 4. When the signal is output, the CRC of the base station data is calculated, and the C
If the RC matches the CRC transmitted in the base station data, a CRC match signal is output.
A CRC calculation unit 7 that outputs a mismatch signal is an interrupt generation unit that outputs an interrupt signal when a CRC match signal is output from the CRC calculation unit 6.

When the base station of the mobile station is determined, a search request is output, and when an interrupt signal is output from the interrupt generation unit 7, reception of base station data in which a unique word is detected is performed. The level is compared with the reference level. If the level is higher than the reference level, the base station related to the base station data is determined as the base station of the mobile station. A CPU (base station determining means) for outputting a search request and a clock starting signal.

Further, 9 is a clock generating section (clock signal output means) for outputting a clock signal when a search request is output from the CPU 21, and 22 is for outputting a search request without outputting a clock in-operation signal. And a clock control unit (clock signal output means) that outputs a clock signal after a predetermined time has elapsed, and continues to output the clock signal when both the search request and the clock starting signal are output.

The clock signal passed through the clock control unit 22 is sent to the RF / IF unit 2, demodulation unit 3, unique word detection unit 4, reception buffer 5, CRC calculation unit 6, interrupt generation unit 7, and CPU 21. Output, RF / IF
The unit 2 and the like operate in synchronization with the clock signal. Also, CP
When the clock signal output from the clock generator 9 is not supplied, the U21 and the clock controller 22 operate by receiving a low-speed clock generated by a crystal oscillator (not shown). FIG. 2 is a flowchart showing the operation of the base station determining apparatus according to Embodiment 1 of the present invention.

Next, the operation will be described. First, when a mobile station requests a base station, the CPU 21
Outputs a search request for requesting determination of a base station to the clock generator 9 and the clock controller 22 (step ST
1). However, at the start-up stage of the clock generator 9, a clock start-up signal indicating that the output of the clock signal is continuing is not output.

The clock generator 9 is provided with a CPU 21
Output a search request, a clock signal is output (step ST2).
In such a case, an unstable clock signal is output for several milliseconds after the start of startup,
A malfunction may occur in the / IF unit 2 and the like. Therefore, in order to prevent such a problem, the clock control unit 2
2 blocks passage of the clock signal until a predetermined time elapses after receiving the search request from the CPU 21 (steps ST3 and ST4), and permits passage of the clock signal after the predetermined time elapses (step ST3). ST
3, ST5).

As described above, when the clock signal is output from the clock controller 22, while the clock signal is being output, the RF / IF unit 2 and the like determine the base station in synchronization with the clock signal. Perform the operation of That is, R
The F / IF unit 2 converts a high-frequency signal (base station data) received by the antenna 1 into a baseband signal (base station data), and outputs the baseband signal to the demodulation unit 3.

When the baseband signal (base station data) is output from the RF / IF section 2, the demodulation section 3 demodulates the base station data and outputs it to the unique word detection section 4 and the like. Then, when the base station data is output from the demodulation unit 3, the unique word detection unit 4 identifies whether or not a bit sequence that matches a preset unique word exists in the bit sequence of the base station data, If there is a bit string that matches the unique word, a unique word detection signal is output to the reception buffer 5 and the CRC calculation unit 6 (step ST6). When the unique word detection unit 4 outputs the unique word detection signal, the unique word detection unit 4 temporarily stops the process of detecting the unique word until receiving the CRC mismatch signal from the CRC calculation unit 6.

When the unique word detection signal is output from the unique word detection section 4, the reception buffer 5 uses the unique word detection signal as a trigger to set a bit sequence after the unique word in the bit sequence constituting the base station data. Is stored. When the unique word detection signal is output from the unique word detection unit 4, the CRC calculation unit 6 checks the CRC of the base station data by using the unique word detection signal as a trigger to check for transmission errors in the base station data. calculate. If the CRC matches the CRC transmitted in the base station data,
It determines that there is no transmission error in the base station data, and outputs a CRC match signal to the interrupt generation unit 7. On the other hand, if they do not match, it is determined that there is a transmission error in the base station data and CR
The C mismatch signal is output to the unique word detection unit 4. As a result, the unique word detection unit 4 restarts the process of detecting a unique word.

Then, the interrupt generation unit 7 includes a CRC calculation unit 6
When a CRC match signal is output from the
21. When the CPU 21 receives the interrupt signal from the interrupt generation unit 7 after outputting the search request, the CPU 21 executes a process of reading the base station data from the reception buffer 5 (step ST7), and receives the reception level of the base station data. Is higher than the reference level, the base station that transmitted the base station data is identified from the identification code indicating the source base station included in the base station data, and the base station is identified as the base station of the mobile station. Station (step ST8,
ST9).

On the other hand, if the reception level of the base station data is not higher than the reference level, it is determined that the mobile station is not appropriate as the base station, and the search request is again sent to the clock generator 9 and the clock controller. The same operation is repeated to attempt to determine a base station (step S22).
T8, ST10). However, in this case, the clock generator 9 is currently being activated, and there is no risk of outputting an unstable clock signal as at the time of activation, and there is no need to wait for the elapse of a predetermined time. A clock starting signal is output to the clock control unit 22 to continue the operation (step ST10). Thereby, the clock control unit 2
2 permits the passage of the clock signal after receiving the search request without blocking the passage (step ST1).
1, ST12), and the clock signal is continuously supplied to the RF / IF unit 2 and the like.

As is apparent from the above, the first embodiment
According to the present invention, when a search request is output without outputting a clock-in-progress signal, a clock signal is output after a predetermined time has elapsed, and when both a search request and a clock-in signal are output, a clock signal is output. Is continued, so that even if it becomes necessary to output a search request again, it is possible to prevent the occurrence of time during which reception of base station data is disabled.

Embodiment 2 In the first embodiment, the case where the base station is determined immediately when the reception level is higher than the reference level is described. However, the search request is output a plurality of times without immediately determining the base station. A plurality of reference data whose levels are higher than the reference level are sampled, the reception levels of the respective base station data are compared with each other, and the base station relating to the base station data having the highest reception level is determined as the base station of the mobile station. You may. As a result, there is an effect that the most appropriate base station can be determined as the base station of the mobile station within the range searched for the base station.

Embodiment 3 FIG. 3 is a block diagram showing a base station determining apparatus according to Embodiment 3 of the present invention. In the figure, the same reference numerals as those in FIG. 1 denote the same or corresponding parts, and a description thereof will be omitted. Reference numeral 23 denotes a unique word detection unit (detection means) that restarts the unique word detection process when a reset signal is output from the identification code determination unit 24, and has the same functions as those of the unique word detection unit 4 in FIG. Have. 24, when the unique word detection signal is output from the unique word detection unit 23, a predetermined bit length data is extracted from the head of the base station identification code from the base station data where the unique word is detected, and the base station identification code is If it does not match the preset base station identification code, it is an identification code determination unit (base station determining means) that outputs a reset signal.

The reference numeral 25 designates a base station identification code and a bit length to be compared in advance in the identification code determination unit 24, and outputs a search request when determining the base station of the mobile station. Is a CPU (base station determining means) that determines a base station associated with base station data for which a unique word has been detected as a base station of a mobile station when an interrupt signal is output from the mobile station.

Next, the operation will be described. Since the configuration other than the unique word detection unit 23, the identification code determination unit 24, and the CPU 25 is the same as that of the first embodiment, mainly the unique word detection unit 23, the identification code determination unit 24, and the CPU 25
Will be described.

First, the unique word detection unit 23
When a unique word is detected in the same manner as in the unique word detection unit 4, a unique word detection signal is output to the identification code determination unit 24. When the unique word detection signal is output from the unique word detection unit 23, the identification code determination unit 24 extracts predetermined bit length data from the head of the base station identification code from the base station data where the unique word is detected. .

Here, the base station identification code is a bit string that constitutes a part of the base station data as shown in FIG. 4 (the base station identification code is composed of 42 bits before the information bit I). For example, when the mobile station is used in the self-employed mode (for example, a case where a cordless telephone is used as the PHS corresponds to this case, in which case the cordless telephone slave unit corresponds to the mobile station, and the cordless telephone base unit is (Corresponding to a station), the base station of the mobile station is limited to a specific base station (in the case of a cordless telephone, only the base unit can be the base station of the slave unit). The base station cannot be determined only from the viewpoint that the level is higher than the reference level.

After extracting the base station identification code from the base station data, the identification code determination unit 24
It is determined whether or not it matches the base station identification code set by (1). For example, when the mobile station is used in the private mode, it is determined whether or not the identification number (system call code + additional ID) of the private system matches. If the base station identification codes do not match, the reset signal is output to the unique word detection unit 23 because the base station is not suitable as the base station of the mobile station, and the unique word detection process is restarted. On the other hand, if the base station identification codes match, the detection result of the unique word detection unit 23 is accepted without outputting a reset signal because the base station of the mobile station is suitable.

Then, similarly to the first embodiment,
When an interrupt signal is output from the interrupt generation unit 7 to the CPU 25, the CPU 25 transmits the base station data from the base station identification code included in the base station data stored in the reception buffer 5. The base station is recognized, and the base station is determined as the base station of the mobile station.

As is clear from the above, the third embodiment
According to the method, when the unique word detection signal is output from the unique word detection unit 23, the base station identification code is extracted from the base station data in which the unique word is detected, and the base station identification code is set in advance. If the identification code matches, the base station related to the base station data is determined as the base station of the mobile station, so that the base station suitable for the mobile station can be determined. Since the CPU 25 receives the base station data and determines the base station only when the base station identification code matches, the CPU 25 outputs a search request again because it has received a base station having an undesired base station identification code. Therefore, it is not necessary to repeat the same operation, and it is possible to prevent the occurrence of time during which reception of base station data is disabled.

Embodiment 4 FIG. FIG. 5 is a block diagram showing a base station determining apparatus according to Embodiment 4 of the present invention. In the figure, the same reference numerals as those in FIG. 3 denote the same or corresponding parts, and a description thereof will be omitted. Reference numeral 26 sets a base station identification code and a bit length to be compared in advance in the identification code determination unit 24, and outputs a search request when determining the base station of the mobile station. Is output, the received level of the base station data where the unique word is detected is compared with the reference level, and if the received level is higher than the reference level, the base station related to the base station data is determined as the base station of the mobile station. On the other hand, if not higher than the reference level,
It is a CPU (base station determining means) that outputs a search request and a clock starting signal to the clock control unit 22 and the like.

Next, the operation will be described. In the third embodiment, the case where the base station identification code is used to immediately determine the base station from the base station data when the predetermined bit length data matches from the head of the base station identification code has been described. However, when the mobile station is used in the public mode, Since there is a possibility that a plurality of base station data having the same carrier identification number in the base station identification code can be sampled (when the mobile station is used in the private mode, the base station having the same base station identification code can be sampled). Data is 1
CPU 2) as in the first embodiment.
6 when the reception level of the base station data is higher than the reference level, the base station related to the base station data is determined as the base station of the mobile station, while the reception level of the base station data is not higher than the reference level. Alternatively, a search request may be output to the clock generator 9 and the clock controller 22 again, and the same operation may be repeated to try to determine a base station.

Thus, when a search request is output again, it is possible to determine a base station having a high reception level as a base station of a mobile station while preventing occurrence of a time during which base station data cannot be received. The effect that can be performed.

Embodiment 5 In the fourth embodiment, the base station is determined immediately when the reception level of the base station data having the matching base station identification code is higher than the reference level. However, the base station is not determined immediately. Further, by outputting the search request a plurality of times, a plurality of reference data having a reception level higher than the reference level are sampled, and the reception levels of the base station data are compared with each other. The station may be determined as the base station of the mobile station. As a result, there is an effect that the most appropriate base station can be determined as the base station of the mobile station within the range searched for the base station.

Embodiment 6 FIG. In the above fourth embodiment, for example, the case where the identification number of the carrier is used as the base station identification code has been described. However, if the location registration of the mobile station has already been completed, the CPU 26 transmits the base station simultaneously. Since the paging area information can be known, the base station identification code set in the identification code determination unit 24 includes the identification code of the paging area,
It may be determined whether or not the identification codes of the paging areas match (see FIG. 6). As a result, even when receiving base station data from a base station other than the paging area, the base station does not need to be determined as the base station of the mobile station, and the validity of the determined base station can be improved. Can be

Embodiment 7 FIG. In the sixth embodiment, the case where the identification code of the paging area is used as the base station identification code has been described. However, when base station data having the same base station identification code cannot be received, the CPU 26 determines the identification code. Changing the base station identification code set in the unit 24,
The identification code of the paging area may be deleted from the base station identification code. Thereby, even when the base station of the paging area cannot be determined as the base station of the mobile station, the base station of the mobile station can be determined, and the paging area that is likely to be able to determine an appropriate base station initially is high. The selection of the base station is started from the step (b), and thereafter, the effect of expanding the base station selection area as needed is achieved.

Embodiment 8 FIG. FIG. 7 is a block diagram showing a base station determining apparatus according to Embodiment 8 of the present invention. In the figure, the same reference numerals as those in FIG. 3 denote the same or corresponding parts, and a description thereof will be omitted. 27 is a level determining unit (detecting means) for comparing the reception level of the base station data with the reference level and outputting a detection permission signal only when the reception level is higher than the reference level, and 28 is a detection permission signal from the level determination unit 27. Is output, a unique word detection unit (detection means) that starts a unique word detection process, and has the same other functions as the unique word detection unit 23 of FIG. Reference numeral 29 denotes a CPU (base station determining means) for setting a reference level in the level determination unit 27.
It has the same function as U25.

Next, the operation will be described. Since the configuration other than the level determination unit 27, the unique word detection unit 28, and the CPU 29 is the same as that of the third embodiment, the operations of the level determination unit 27, the unique word detection unit 28, and the CPU 29 will be mainly described.

First, the level determination section 27
When the reference level is set from 9, the reception level of the base station data received by the antenna 1 is compared with the reference level. Then, when the reception level of the base station data is higher than the reference level, a detection permission signal for permitting the start of the unique word detection process in the unique word detection unit 28 is output, but the reception level of the base station data is higher than the reference level. If the value is not high, the detection permission signal is not output to the unique word detection unit 28 because it is not suitable as the base station of the mobile station.

Thus, the unique word detecting section 28
Does not perform the unique word detection process when the reception level of the base station data is not higher than the reference level, so that the base station related to such base station data is determined as the base station of the mobile station. Will not be.

As is apparent from the above description, this embodiment 8
According to the above, only when the reception level of the base station data is higher than the reference level, the unique word is detected from the base station data, so if the reception level of the base station data is not higher than the reference level, Interrupt signal is CPU
29, and therefore, even in such a case, it is not necessary to output the search request again, so that there is an effect that the unreceivable time of the base station data generated with the search request can be suppressed.

Embodiment 9 FIG. In the above-mentioned Embodiment 8, the case where the base station is immediately determined when the reception level is higher than the reference level has been described. However, as shown in FIG.
The CPU 29 outputs a search request and a clock-initiating signal a plurality of times without immediately determining a base station, thereby sampling a plurality of reference data having a reception level higher than the reference level, and reducing the reception level of each base station data. By comparing the base stations with each other, the base station related to the base station data having the highest reception level may be determined as the base station of the mobile station. As a result, there is an effect that the most appropriate base station can be determined as the base station of the mobile station within the range searched for the base station.

Embodiment 10 FIG. In the eighth and ninth embodiments, the case where the reference level is fixedly used has been described. However, the CPU 29 sets the reference level to be gradually increased until the unique word detection unit 28 cannot detect the unique word. May be changed. If no interrupt signal is generated, the search operation is stopped by the CPU 29 stopping the search request. This has an effect that the most appropriate base station can be determined as the base station of the mobile station by a simple control method.

[0059]

As described above, according to the first aspect of the present invention, when a search request is output without outputting a clock-in-progress signal, a clock signal is output after a lapse of a predetermined time, while a search signal is output. Since the output of the clock signal is continued when both the request and the clock starting signal are output, even if it becomes necessary to output the search request again, the time during which the base station data cannot be received becomes impossible. This has the effect of preventing the occurrence of blemishes.

According to the second aspect of the present invention, when there are a plurality of base station data having a reception level higher than the reference level, the reception levels of the respective base station data are compared with each other, and the base station data having the highest reception level is obtained. Is configured to be determined as the base station of the mobile station, there is an effect that a base station suitable as the base station of the mobile station can be determined.

According to the third aspect of the present invention, when a unique word is detected by the detecting means, a base station identification code is extracted from the base station data where the unique word is detected,
When the base station identification code matches the preset base station identification code, the base station according to the base station data is determined as the base station of the mobile station. There is an effect that a suitable base station can be determined. Note that only when the base station identification code matches, the base station data is received to determine the base station.
It is not necessary to output the search request again and repeat the same operation, and it is also possible to prevent occurrence of a time during which reception of base station data becomes impossible.

According to the present invention, when there are a plurality of base station data having the same base station identification code, the reception levels of the base station data are compared with each other, and the base station data having the highest reception level is compared. Is determined as the base station of the mobile station, so that there is an effect that the most appropriate base station can be determined as the base station of the mobile station within the range searched for the base station.

According to the fifth aspect of the present invention, since the base station identification code is configured to include the identification code of the private system, base station data is received from a base station other than the desired private system. However, there is no need to determine the base station as the base station of the mobile station, which has the effect of improving the relevance of the base station for the determination.

According to the sixth aspect of the present invention, since the base station identification code set in advance includes the identification code of the paging area in which the mobile station is registered in the location, the base station other than the paging area is configured. Even when receiving the base station data from the station, the base station need not be determined as the base station of the mobile station, which has the effect of improving the validity of the base station for the determination.

According to the seventh aspect of the present invention, when base station data having the same paging area identification code is not detected, the base station is determined without considering the paging area identification code. Therefore, even when the base station of the paging area cannot be determined as the base station of the mobile station, the base station of the mobile station can be determined. The selection of the base station is started from then, and thereafter, there is an effect that the selection area of the base station can be expanded as needed.

According to the present invention, the unique word is detected from the base station data only when the reception level of the base station data is higher than the reference level. Is not higher than the reference level, the unique word detection process is not performed. Therefore, even when the reception level of the base station data is lower than the reference level, it is not necessary to output a search request again, and as a result, In addition, there is an effect that the unreceivable time of the base station data generated in response to the search request can be suppressed.

According to the ninth aspect of the present invention, when there are a plurality of base station data in which a unique word is detected,
Since the reception levels of the respective base station data are compared with each other, and the base station relating to the base station data having the highest reception level is determined as the base station of the mobile station, the most appropriate one within the range searched for the base station There is an effect that a suitable base station can be determined as a base station of a mobile station.

According to the tenth aspect of the present invention, when the base station of the mobile station is determined, the reference level is gradually increased until the unique word is no longer detected by the detecting means. The control method has an effect that the most appropriate base station can be determined as the base station of the mobile station.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a base station determining apparatus according to Embodiment 1 of the present invention.

FIG. 2 is a flowchart showing an operation of the base station determining apparatus according to the first embodiment of the present invention.

FIG. 3 is a configuration diagram showing a base station determining apparatus according to Embodiment 3 of the present invention.

FIG. 4 is a control channel structure diagram showing a structure of base station data.

FIG. 5 is a configuration diagram showing a base station determining apparatus according to Embodiment 4 of the present invention.

FIG. 6 is an explanatory diagram illustrating a paging area.

FIG. 7 is a configuration diagram showing a base station determining apparatus according to Embodiment 8 of the present invention.

FIG. 8 is a configuration diagram showing a base station determining apparatus according to Embodiment 9 of the present invention.

FIG. 9 is a configuration diagram illustrating a conventional base station determination device.

[Explanation of symbols]

1 antenna (detection unit), 2 RF / IF unit (detection unit), 3 demodulation unit (detection unit), 4, 23, 28 unique word detection unit (detection unit), 9 clock generation unit (clock signal output unit), 21,25,26,29
CPU (base station determination means), 22 clock control section (clock signal output means), 24 identification code determination section (base station determination means), 27 level determination section (detection means).

Claims (10)

[Claims] When a search request is output without outputting a clock activation signal indicating that output of a clock signal is continuing, a clock signal is output after a lapse of a predetermined time, while a search request and a clock are output. When both of the start-up signals are output, the clock signal output unit that continues to output the clock signal, and the base station data transmitted from the base station are synchronized with the clock signal output from the clock signal output unit. Receiving means for detecting a unique word from the base station data, and, when the unique word is detected by the detecting means, comparing the reception level of the base station data where the unique word is detected with a reference level, If it is higher than the level, the base station related to the base station data is determined as the base station of the mobile station,
A base station determining apparatus comprising: a base station determining unit that outputs a search request and a clock starting signal to the clock signal output unit when the reference level is not higher than the reference level. 2. When there are a plurality of base station data having a higher reception level than the reference level, the base station determining means compares the reception levels of the respective base station data with each other and determines the base station data having the highest reception level. The base station determining apparatus according to claim 1, wherein the base station is determined as a base station of the mobile station. 3. When a search request is output, a clock signal output means for outputting a clock signal, and base station data transmitted from the base station in synchronization with the clock signal output from the clock signal output means. Receiving,
Detecting means for detecting a unique word from the base station data, and when the detecting means detects the unique word, a base station identification code is extracted from the base station data where the unique word is detected, and the base station identification code is A base station determining apparatus comprising: a base station determining unit that determines a base station related to the base station data as a base station of a mobile station when the base station identification code matches a preset base station identification code. 4. When there are a plurality of base station data having the same base station identification code, the base station determining means compares the reception levels of the respective base station data with each other, and determines the base station data having the highest reception level. 4. The base station determining apparatus according to claim 3, wherein the base station is determined as a base station of the mobile station. 5. The base station determining apparatus according to claim 3, wherein the base station identification code set in advance includes an identification code of the private system. 6. The base station determining apparatus according to claim 3, wherein the preset base station identification code includes an identification code of a paging area in which the mobile station is registered. 7. The base station according to claim 6, wherein when base station data having the same identification code of the paging area is not detected, the base station is determined without considering the identification code of the paging area. Decision device. 8. When a search request is output, a clock signal output means for outputting a clock signal, and base station data transmitted from the base station in synchronization with the clock signal output from the clock signal output means. Receiving,
Detecting means for detecting a unique word from the base station data when the reception level of the base station data is higher than the reference level; and detecting the unique word by the detecting means, A base station determining apparatus comprising: a base station determining unit that determines a base station for data as a base station of a mobile station. 9. When there are a plurality of base station data in which a unique word is detected, the base station determining means compares the reception levels of the respective base station data with each other, and determines the base station associated with the base station data having the highest reception level. The base station determining apparatus according to claim 8, wherein the station is determined as a base station of the mobile station. 10. The system according to claim 8, wherein the base station determining means increases the reference level stepwise until the detecting means no longer detects the unique word when determining the base station of the mobile station. Item 10. The base station determination device according to item 9.