JP5292117B2 - Wireless communication device - Google Patents

Description

  The present invention relates to, for example, a wireless communication apparatus in a wireless communication system, and more particularly to a base station search processing technique for a wireless communication apparatus.

The operation of a conventional wireless communication device, for example, a wireless mobile station device will be described.
Neighboring base station changes when operating in the initial state in which no cell is present (no communicable base station is present) or the wireless mobile station is turned on and started up At times, the reception frequency of the mobile station apparatus is set to one of a plurality of frequencies with which the mobile station apparatus can communicate, and the base station search process is started. When the mobile station apparatus detects a signal received from a certain base station as an effective signal that matches the reception frequency set in the mobile station apparatus, the base station that has transmitted the signal is determined as a connection candidate station. Whether or not the detected signal is valid can be determined, for example, based on whether or not the quality measurement results such as carrier level (RSSI) and reception quality (RSCP and Ec / Io) of the detected signal are equal to or higher than a predetermined reference value. it can. Here, Received Signal Strength Indicator (RSSI) represents received signal strength. RSCP (Received Signal Code Power) represents the desired wave received power. Ec / Io represents (pilot received power / all received power).
Also, when the broadcast information received from the base station is analyzed and the base station that transmitted the broadcast information is determined to be a connectable base station, the base station is registered in the mobile station memory as a connectable base station. . The broadcast information includes information such as which operator's station the base station that transmitted the broadcast information is.

  Next, the reception frequency is set to another frequency among the plurality of frequencies with which the mobile station can communicate, and the base station search processing operation similar to the above is repeated to search for connectable base stations. Thus, after completing the search process for all frequencies that the mobile station can communicate with, among the plurality of base stations registered in the mobile station memory as connectable base stations, the base station most suitable for connection is selected. Select and connect. Whether the base station is most suitable for connection is determined by the received signal strength, received quality, and the like.

Japanese Patent Laid-Open No. 2000-156662

  Japanese Patent Laid-Open No. 2000-156661 discloses a radio base station apparatus in which the level of each received signal is measured for each received signal transmitted from a plurality of radio base station apparatuses, and the level of the received signal is maximized. Is selected and connected.

  However, in the base station search process of the conventional radio mobile station apparatus as described above, the operation is such that the entire frequency range that can be set in the radio mobile station apparatus is searched in order. There was a problem that it took a lot of time to do. In general, the base station search process is one of the factors that consumes a large amount of power of the radio mobile station apparatus. Since the power supply means of the wireless mobile station is mainly a battery or other storage device, the operation of sequentially searching all the frequency ranges that can be set in the wireless mobile station device increases the power consumption, and the wireless mobile station The use time of the apparatus is shortened, which affects the convenience of the user.

  The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide a wireless communication apparatus that efficiently performs a base station search process.

In order to achieve the above object, in the present invention, the wireless communication apparatus has the following configuration. That is,
A wireless transmission / reception unit for transmitting / receiving a signal wirelessly communicated with the base station device;
A base station search unit for searching for an effective base station device based on a received signal received by the radio transceiver unit;
The reception frequency band of the wireless transmission / reception unit is set from frequency bands that can be received regardless of whether or not the frequency band is used by an available base station device, and A search control unit for controlling the search process,
The base station search unit
A reception strength measurement unit for measuring the reception signal strength of the reception signal received by the wireless transmission / reception unit;
A reception quality measuring unit for measuring the quality of the received signal;
A reception strength determination unit that determines whether or not the reception signal strength measured by the reception strength measurement unit is greater than or equal to a reference value;
Whether or not the communication method related to the received signal for which the received signal strength is determined to be equal to or higher than the reference value by the received strength determining unit is a communication method capable of communication depending on whether or not the received signal can be demodulated . A communication method determination unit for determining
A reception quality determination unit that determines whether or not the reception quality of the received signal determined to be a communication method capable of communication by the communication method determination unit is greater than or equal to a reference value;
On the basis of the carrier information contained by the reception quality determining unit in the broadcast information obtained from the reception signal determined the reception quality is equal to or greater than the reference value, the base station apparatus that transmitted the received signal is utilized available-base A base station determination unit that determines whether or not a station device,
The search control unit causes the base station search unit to execute search processing for a plurality of reception frequency bands that can be received by the radio transmission / reception unit one by one, and the base station search unit searches for the effective base station device. Otherwise, the search process for another reception frequency band is executed, and when the effective base station device is searched by the base station search unit, the base station device is set as a communication partner and the search by the base station search unit is performed. A wireless communication apparatus characterized in that the process is terminated.
In order to achieve the above object, in the present invention, the wireless communication apparatus has the following configuration. That is,
A wireless transmission / reception unit for transmitting / receiving a signal wirelessly communicated with the base station device;
A base station search unit for searching for an effective base station device based on a received signal received by the radio transceiver unit;
The reception frequency band of the wireless transmission / reception unit is set from frequency bands that can be received regardless of whether or not the frequency band is used by an available base station device, and A search control unit for controlling the search process,
The base station search unit
A reception strength measurement unit for measuring the reception signal strength of the reception signal received by the wireless transmission and reception unit;
A reception quality measuring unit for measuring the quality of the received signal;
A reception strength determination unit that determines whether or not the reception signal strength measured by the reception strength measurement unit is greater than or equal to a reference value;
Whether or not the communication method related to the received signal for which the received signal strength is determined to be equal to or higher than the reference value by the received strength determining unit is a communication method capable of communication depending on whether or not the received signal can be demodulated . A communication method determination unit for determining
A base station apparatus that can be used by the base station apparatus that has transmitted the received signal based on the provider information included in the broadcast information obtained from the received signal determined to be a communication system that can be communicated by the communication system determining unit A base station determination unit that determines whether or not
Together and a reception quality determination unit the reception quality of the received signal is determined to be the available base station apparatus by the base station determining unit determines der than the reference value Luca,
The search control unit causes the base station search unit to execute search processing for a plurality of reception frequency bands that can be received by the radio transmission / reception unit one by one, and the base station search unit searches for the effective base station device. Otherwise, the search process for another reception frequency band is executed, and when the effective base station device is searched by the base station search unit, the base station device is set as a communication partner and the search by the base station search unit is performed. A wireless communication apparatus characterized in that the process is terminated.
In the above invention, the search control unit is determined to be a method that is not communicable by the communication method determination unit, or a case where the reception quality determination unit determines that the reception quality is lower than a reference value. If it is determined by the base station determination unit that the base station is not a usable base station, whether there is another radio wave having a received signal strength equal to or higher than a reference value in the set reception frequency band. determining, by executing the processing in the communication mode determination unit, if present, it is preferable to perform search operations for other reception frequency band in the absence.

  According to the present invention, when the search control unit sets the reception frequency of the radio mobile station apparatus to one of a plurality of usable radio frequencies and receives a signal of the set reception frequency from the base station apparatus, To control the reception strength determination unit, the communication method determination unit, the reception quality determination unit, and the base station determination unit to make a determination, and to enable connection to the base station apparatus in any of the determination units Is not satisfied, the reception frequency of the radio mobile station apparatus is set to another usable radio frequency stored in the storage unit, and the determination unit is made to perform the determination. When all of the units satisfy the criterion for enabling connection with the base station device, the base station device that satisfies the criterion is connected and the base station search process for other base station devices is terminated. So connectable Compared with the conventional method of searching all such base station apparatus, it is possible to reduce the base station search processing time, it is possible to reduce the power consumption of the base station search processing.

It is a figure which shows the structural example of the radio | wireless communications system which concerns on this invention. It is a figure which shows the structural example of the radio | wireless communication apparatus which concerns on this invention. It is a figure which shows an example of the base station search process in the radio | wireless communication apparatus which concerns on this invention. It is a figure which shows the condition of the base station around a mobile station in the Example of this invention.

FIG. 1 is a diagram illustrating a configuration example of a wireless communication system according to the present invention.
The radio communication system according to this example employs a DS-CDMA (Direct Spread Code Division Multiple Access) system, which includes a radio mobile station apparatus 11, a base station apparatus 12, an exchange station 13, a public network 14 and the like. The wireless mobile station apparatus 11 communicates with the base station apparatus 12 using radio waves as a medium, such as voice and packet data. In this example, the base station apparatus 12 uses the frequency band of Band1 to Band7 defined in the DS-CDMA system, and includes broadcast information including information such as which carrier the base station apparatus 12 belongs to Is constantly transmitted to the wireless mobile station apparatus 11. The radio mobile station apparatus 11 executes base station search processing using all frequencies for the Band1 to Band7 frequency bands.

FIG. 2 is a diagram illustrating a configuration example of a radio mobile station apparatus according to the present invention.
The wireless mobile station device 11 of this example is a mobile station in a mobile communication system, and includes a wireless transmission / reception unit 201, a baseband signal processing unit 202, a main control unit 210, a display device 205, a voice input device 206, and the like. A voice output device 207 and another input device 208. The main control unit 210 includes, as functions, an application unit (AP unit) 211, a call processing control unit (call control unit) 212, a reception strength determination unit 213, a communication method determination unit 214, and a reception quality determination unit. 215, a base station determination unit 216, a search control unit 217, and a storage unit 218. The hardware configuration includes a CPU and a memory.

  The wireless transmission / reception unit 201 transmits / receives a signal wirelessly communicated between the base station apparatus 12 and the wireless mobile station apparatus 11, and performs band conversion between a radio frequency band signal and a baseband signal. The baseband signal processing unit 202 is a baseband reception process for the signal converted into a baseband band by the wireless transmission / reception unit 201, and a baseband transmission process for transmitting data to the base station via the wireless transmission / reception unit 201 The reception signal strength measurement processing of the reception signal received by the wireless transmission / reception unit 201 and the reception quality measurement processing based on the measured reception signal strength are performed. That is, in this example, the baseband signal processing unit 202 functions as a reception intensity measurement unit and a reception quality measurement unit. Specifically, the baseband signal processing unit 202 calculates the received signal strength from the input level of the input received signal. In addition, the baseband signal processing unit 202 calculates reception quality from the ratio of the received signal strength of the signal desired to be received and the received signal strength such as other noise based on the calculated received signal strength.

  The display device 205 includes an LCD or the like, and displays received data, input data, and the like. The voice input device 206 is composed of a microphone or the like and accepts input of voice or the like. The audio output device 207 is configured by a speaker or the like, and outputs a received audio signal or the like as sound. The other input device 208 is composed of a key including a numeric keypad and receives a key input or the like.

The application unit 211 performs data transmission / reception processing associated with a communication application executed by the wireless mobile station apparatus 11.
The call processing control unit 212 controls call processing of the wireless mobile station device 11 and outputs the received signal data subjected to baseband processing by the baseband signal processing unit 202 to the voice output device 207 or voice input. The audio data input from the device 206 is baseband processed by the baseband signal processing unit 202 and transmitted via the wireless transmission / reception unit 201.

Based on the received signal strength measured by the baseband signal processing unit 202, the received strength determining unit 213 has a received signal strength of a predetermined reference value or higher among the received signals of the same frequency received by the wireless transmitting / receiving unit 201. It is determined whether there is a certain received signal.
Based on the reception signal received by the wireless transmission / reception unit 201, the communication method determination unit 214 determines whether the communication method of the base station device 12 that has transmitted the reception signal is a communication method that can communicate with the wireless mobile station device 11. Determine whether.
The reception quality determination unit 215 determines whether the reception quality of the reception signal received by the wireless transmission / reception unit 201 is equal to or higher than a predetermined reference value based on the reception quality measured by the baseband signal processing unit 202.
Based on the reception information (broadcast information) received by the wireless transmission / reception unit 201, the base station determination unit 216 determines whether or not the base station device 12 that has transmitted the reception information is a base station device 12 that can use the service. For example, it is determined whether or not the base station device 12 is the same provider, and the usable base station device 12 is determined to be an effective base station device 12.
Note that the reception strength measurement unit, reception quality measurement unit, reception strength determination unit 213, communication method determination unit 214, reception quality determination unit 215, and base station determination unit 216 described above are included in the received signal received by the wireless transmission / reception unit 201. It functions as a base station search unit that searches for an effective base station device 12 based on the base station.
The storage unit 218 stores a plurality of radio frequencies that can be used by the radio mobile station apparatus 11.

  The search control unit 217 sets the reception frequency of the radio transmission / reception unit 201 and controls the search processing of the base station apparatus by the base station search unit, and searches for a plurality of reception frequencies that can be received by the radio transmission / reception unit 201. The base station search unit executes the processing one by one. If the base station search unit does not search for an effective base station device, the search control unit 217 executes search processing for other reception frequencies, while the base station search unit searches for an effective base station device. Then, the base station apparatus is set as a communication partner, and the search process by the base station search unit is terminated.

More specifically, the search control unit 217 searches (searches) for the connectable base station device 12 and can use the reception frequency of the wireless mobile station device 11 stored in the storage unit 218. When a signal having the set frequency is received from the base station apparatus 12, the received signal strength of the received signal is greater than or equal to a reference value. It is determined whether or not there is a received signal having a received signal strength equal to or higher than a reference value among the received signals having the same frequency, and then the communication method determining unit 214 receives the received signal. It is determined whether the communication system of the base station apparatus 12 that transmitted the signal is a communication system that can communicate with the radio mobile station apparatus 11, and then the reception quality determination unit 215 receives the reception quality of the received signal. Is greater than or equal to the reference value Next, the reception strength determination unit 213 causes the base station determination unit 216 to determine whether or not the base station device 12 that has transmitted the reception information is an available base station device 12. The communication method determination unit 214, the reception quality determination unit 215, and the base station determination unit 216 are controlled to perform the determination in this order, and the base station apparatus 12 can be connected to any of the determination units. If the determination criterion for satisfying is not satisfied, the search at the set first reception frequency is terminated, and the reception frequency of the radio mobile station apparatus 11 is changed to another usable radio frequency stored in the storage unit 218. When the determination criteria are set and the respective determination units perform the determination in the order described above, and all the determination units satisfy the determination criteria for enabling connection with the base station apparatus 12, the determination criteria are satisfied. While connected to the Chikyoku unit 12 ends the base station search processing for the another base station device 12.
Further, the main control unit 210 performs overall control of the wireless transmission / reception unit 201, the baseband signal processing unit 202, the display device 205, the audio input device 206, the audio output device 207, and the other input device 208.

Next, the base station search operation and its control method of the radio mobile station apparatus 11 of this example will be described using the flowchart of FIG.
First, the search control unit 217 sets the reception frequency of the radio transmission / reception unit 201 of the radio mobile station apparatus 11 to the first frequency among a plurality of usable radio frequencies stored in the storage unit 218 (step S1). ). Next, when a signal of the set reception frequency is received from the base station apparatus 12, the received signal strength of the received signal is measured by the baseband signal processing unit 202 (step S2). When a plurality of reception signals having the same reception frequency are detected, the reception signal strength is measured for all of them. Next, the reception intensity determination unit 213 determines whether or not there is a radio wave having a reception signal intensity equal to or greater than a certain reference value in the measured reception signal (step S3). If there is no radio wave whose received signal strength is greater than or equal to the reference value (No in step S3), the base station apparatus 12 that transmitted the radio wave does not satisfy the criteria for making it connectable to the wireless mobile station apparatus 11. Subsequent determination at the first reception frequency set in the wireless transmission / reception unit 201, that is, determination by the communication method determination unit 214, the reception quality determination unit 215, and the base station determination unit 216, and the wireless mobile station apparatus 11 is set to another usable second radio frequency stored in the storage unit 218 (step S10). If there is no radio wave having a received signal strength equal to or higher than the reference value for all usable radio frequencies stored in the storage unit 218, the search process ends.

  If there is a radio wave whose received signal intensity is greater than or equal to the reference value among the measured received signals (Yes in step S3), the base station apparatus 12 that has transmitted the received signal for one of the received signals of the radio wave. The communication method determination unit 214 determines whether or not the communication method is a communication method capable of communicating with the wireless mobile station device 11 (step S4). For example, if the communication system of the received signal transmitted from the base station apparatus 12 is a PDC (Personal Digital Cellular) system, communication is possible because it is different from the DS-CDMA system that is the communication system of the mobile station apparatus 11. Judge that it is not a communication method. Specifically, when radio waves received by the wireless transmission / reception unit 201 cannot be demodulated and become noise, it can be determined that the communication method is not communicable.

  If the communication system of the base station apparatus 12 that has transmitted the received signal is not a communication system that can communicate with the wireless mobile station apparatus 11 (No in step S4), the radio signal of the received signal is determined to be connectable. Since the reference is not satisfied, the reception strength determination unit 213 determines whether there is another radio wave having a reception signal strength equal to or higher than the reference value at the same frequency as the set first reception frequency (step S9). If there is no other radio wave having a received signal strength equal to or higher than the reference value (No in step S9), the subsequent determination at the set first reception frequency, that is, the reception quality determination unit 215 and the base station determination Without the determination by the unit 216, the reception frequency of the radio mobile station apparatus 11 is set to another radio frequency stored in the storage unit 218 (step S10). If there is another radio wave with the received signal strength equal to or higher than the reference value at the same reception frequency (Yes in step S9), the process returns to step S4, and the communication method of the base station apparatus 12 that transmitted the other radio wave is wireless. The communication method determination unit 214 determines whether or not the communication method can communicate with the mobile station device 11.

  When the communication system of the base station apparatus 12 that has transmitted the received signal is a communication system that can communicate with the wireless mobile station apparatus 11 (Yes in step S4), the reception quality of the received radio wave is set as the baseband signal processing unit. Measurement is performed at 202 (step S5), and the reception quality determination unit 215 determines whether the measured reception quality is equal to or higher than a reference value (step S6). If the reception quality of the received radio wave is not equal to or higher than the reference value (No in step S6), the process proceeds to step S9 because the determination criterion for enabling connection is not satisfied.

  When the reception quality of the received radio wave is equal to or higher than the reference value (Yes in step S6), the base station determination unit 216 reads and analyzes reception information received from the base station device 12, for example, broadcast information, and the broadcast information It is determined whether or not the base station apparatus 12 that has transmitted is an available base station apparatus 12 (step S7). The broadcast information includes information indicating to which provider the base station belongs. If the base station apparatus 12 that has transmitted the broadcast information is not an available base station apparatus 12 (No in step S7), the process proceeds to step S9 because the determination criteria for enabling connection are not satisfied.

  When the base station apparatus 12 that has transmitted the broadcast information is an available base station apparatus 12 (Yes in step S7), the search control unit 217 determines the base station apparatus 12 as a connection partner base station ( Step S8), the base station search process is terminated. Therefore, even if there are other connectable base station apparatuses, the base station search process is not performed.

  As described above, when the search control unit 217 receives a signal of the set reception frequency from the base station apparatus 12, the reception strength determination unit 213, the communication method determination unit 214, the reception quality determination unit 215, and the base station determination The control is performed so that the determination is performed in the order of the unit 216. If any of the determination units does not satisfy the determination standard for enabling connection with the base station apparatus 12, the determination standard is not satisfied. Until the determination unit, the search at the set reception frequency is terminated, the reception frequency of the radio mobile station apparatus 11 is set to another usable radio frequency stored in the storage unit 218, and the determination unit Since the control is performed so that the determination is performed in this order, it takes time for processing, or the communication method determination unit 214, the reception quality determination unit 215, and the base station determination unit 216, which consume a lot of power, It is possible to reduce the number of times of carrying out, it is possible to realize the shortening power consumption of processing time. In particular, since the processing of the reception quality determination unit 215 consumes a larger amount of power than the processing of the reception strength determination unit 213, the processing of the reception quality determination unit 215 should be performed after the processing of the reception strength determination unit 213. Thus, low power consumption can be achieved.

Next, the present invention will be described based on a specific example shown in FIG.
FIG. 4 is a diagram illustrating a situation of base stations around the mobile station in the embodiment of the present invention. In the example of FIG. 4, there are nine base station apparatuses A1 to A3 and B1 to B6 as base stations around the mobile station. The frequency bands that can be transmitted / received by the mobile station apparatus are only Band 1 and Band 2 out of Bands 1 to 7, and the other frequency bands cannot be received. In addition, the base stations A1 to A3 are base stations that cannot be used because the operators are different from the mobile station apparatus, and are base stations with different radio communication schemes. The reference values that are recognized as effective radio waves that can be connected are a received signal strength of −90 (dB) or higher and a received quality of −15 (dBm) or higher.

First, a base station search is performed for the frequency F1. F1 to F4 are stored in the storage unit 218 of the wireless mobile station apparatus 11 as communicable frequency bands. First, the search control unit 217 sets the reception frequency of the radio transmission / reception unit 201 to F1, which is one of a plurality of usable radio frequencies F1 to F4 stored in the storage unit 218 (step of FIG. 3). S1).
As shown in FIG. 4, there are two base station apparatuses of frequency F1, A1 and A2, and the wireless mobile station apparatus 11 receives the received signal of frequency F1 from the base station apparatuses A1 and A2, and increases the received signal strength. Measurement is performed by the baseband signal processing unit 202 (step S2 in FIG. 3), and the reception strength determination unit 213 determines whether or not there is a radio wave having a reception signal strength of −90 (dB) or more which is a reference value ( Step S3 in FIG. For the base station apparatus A1, the received signal strength is −100 (dB) and does not satisfy the reference value −90 (dB), and therefore does not satisfy the determination criterion for enabling connection.

  For the base station apparatus A2, the received signal strength is −80 (dB) and satisfies the reference value of −90 (dB), and therefore the received signal strength is equal to or higher than the reference value (in step S3 of FIG. Yes). Next, the communication method determination unit 214 determines whether or not the communication method of the base station device A2 is a communication method capable of communicating with the wireless mobile station device 11 (step S4 in FIG. 3). However, since the base station A2 is a base station with a different wireless communication system, it does not satisfy the criteria for enabling connection. Then, since there is no other radio wave having the frequency F1 and the received signal strength equal to or higher than the reference value (No in step S9 in FIG. 3), the search control unit 217 cancels the search at the frequency F1, and the radio transmitting / receiving unit 201 Is set to F2, which is another usable radio frequency stored in the storage unit 218 (step S10 in FIG. 3).

Next, a base station search is performed for the frequency F2.
As shown in FIG. 4, the base station apparatuses of frequency F1 are A3, B1, and B5, and the wireless mobile station apparatus 11 receives the reception signal of frequency F2 from the base station apparatuses A3, B1, and B5, and receives the received signal strength. Is measured by the baseband signal processing unit 202 (step S2 in FIG. 3), and the reception strength determination unit 213 determines whether or not there is a radio wave having a reception signal strength of −90 (dB) or more which is a reference value. (Step S3 in FIG. 3).

  For base station apparatus A3, the received signal strength is -90 (dB), which satisfies the reference value of -90 (dB). Next, the communication system determination unit 214 determines whether or not the communication system of the base station apparatus A3 is a communication system that can communicate with the wireless mobile station apparatus 11 (step S4 in FIG. 3). Since A3 is a base station with a different wireless communication system, it does not satisfy the determination criteria for enabling connection, so the search control unit 217 next makes a determination on the base station apparatus B1 (step in FIG. 3). S9).

  For the base station apparatus B1, since the received signal strength is −100 (dB) and does not satisfy the reference value −90 (dB), the search control unit 217 does not satisfy the criterion for enabling connection. Next, the base station apparatus B5 is determined (step S9 in FIG. 3).

  For the base station apparatus B5, the received signal strength is −90 (dB), which satisfies the reference value of −90 (dB), so that the communication method of the base station apparatus B5 communicates with the wireless mobile station apparatus 11 concerned. The communication method determination unit 214 determines whether or not the communication method is possible (step S4 in FIG. 3). Since the base station apparatus B5 is a communication method capable of communicating with the wireless mobile station apparatus 11 (Yes in step S4 in FIG. 3), the baseband signal processing unit 202 converts the reception quality of the radio wave received from the base station apparatus B5. Measurement is performed (step S5 in FIG. 3). The measured reception quality is −20 (dBm), which is less than the reference value of −15 (dBm) (No in step S6 in FIG. 3), and therefore does not satisfy the determination criteria for enabling connection. The search control unit 217 cancels the search at the frequency F2 because there is no other radio wave having a received signal strength equal to or higher than a certain reference value at the frequency F2 (No in step S9 in FIG. 3), and the radio mobile station apparatus 11 is set to F3 which is another usable radio frequency stored in the storage unit 218 (step S10 in FIG. 3).

Next, a base station search is performed for the frequency F3.
As shown in FIG. 4, the base station apparatuses of frequency F3 are B2, B3, and B6. The radio mobile station apparatus 11 receives the reception signal of the frequency F3 from the base station apparatuses B2, B3, and B6, and measures the received signal strength by the baseband signal processing unit 202 (step S2 in FIG. 3). The reception strength judgment unit 213 judges whether or not there is a radio wave having a signal strength of −90 (dB) or more which is a reference value (step S3 in FIG. 3).

  For the base station apparatus B2, the received signal strength is -80 (dB), which satisfies the reference value -90 (dB). Next, the communication method determination unit 214 determines whether or not the communication method of the base station device B2 is a communication method capable of communicating with the wireless mobile station device 11 (step S4 in FIG. 3). Since the base station apparatus B2 is a communication method capable of communicating with the radio mobile station apparatus 11 (Yes in step S4 in FIG. 3), the reception quality of the radio wave received from the base station apparatus B2 is converted by the baseband signal processing unit 202. Measurement is performed (step S5 in FIG. 3), and the reception quality determination unit 215 determines (step S6 in FIG. 3). Since the reception quality of the base station apparatus B2 is −10 (dBm), which is equal to or higher than the reference value −15 (dBm) (Yes in step S6 in FIG. 3), the base station determination unit 216 determines that the base station apparatus B2 The received broadcast information is read and analyzed, and it is determined whether or not the base station apparatus B2 that has transmitted the broadcast information is an available base station apparatus (step S7 in FIG. 3). Since the base station apparatus B2 that has transmitted the broadcast information is the base station apparatus 12 that can use the service (Yes in step S7 in FIG. 3), the search control unit 217 determines that the base station apparatus B2 is the base station of the connection partner. The device is determined (step S8 in FIG. 3), and the base station search process is terminated.

  In this example, as shown in FIG. 4, there are base station apparatuses B3 and B4 other than the base station apparatus B2 as effective base station apparatuses that can be connected. When the base station apparatus is determined, the base station search process for determining whether or not the base station apparatus is an effective base station apparatus that can be connected to another base station apparatus is discontinued and not executed. By doing so, the base station search time can be shortened, and the power consumption of the radio mobile station apparatus can be reduced.

  In the above-described embodiment, the case where the reception strength determination unit 213, the communication method determination unit 214, the reception quality determination unit 215, and the base station determination unit 216 perform determination in order has been described as an example. However, the present invention is not limited to this, and the reception strength determination unit 213, the communication method determination unit 214, the base station determination unit 216, and the reception quality determination unit 215 may be configured in this order. Even in this case, substantially the same operational effects as those of the above-described embodiment can be obtained.

  Further, the present invention is not only a mobile station apparatus that executes the process according to the present invention, but also a method and system for executing the process according to the present invention, or a program for realizing the method and system according to the present invention, It can be understood as a recording medium for recording the program. The present invention may be configured such that the CPU performs control by executing a control program stored in a memory, or may be configured as a hardware circuit.

  11 .. Wireless mobile station device, 12 .... Base station device, 13 .... Switching office, 14 .... Public network, 201 ... Wireless transmitter / receiver, 202 ... Baseband signal processing unit, 203 ... 205 Display device 206 ·· Voice input device 207 · · Voice output device 208 · · Other input device 210 · · Main control unit 211 · · Application unit 212 · · Call processing control unit 213 · · Receive strength Determining unit, 214... Communication method determining unit, 215 .. Reception quality determining unit, 216 .. Base station determining unit, 217 .. Search control unit, 218.

Claims (3)

A wireless transmission / reception unit for transmitting / receiving a signal wirelessly communicated with the base station device;
A base station search unit for searching for an effective base station device based on a received signal received by the radio transceiver unit;
The reception frequency band of the wireless transmission / reception unit is set from frequency bands that can be received regardless of whether or not the frequency band is used by an available base station device, and A search control unit for controlling the search process,
The base station search unit
A reception strength measurement unit for measuring the reception signal strength of the reception signal received by the wireless transmission / reception unit;
A reception quality measuring unit for measuring the quality of the received signal;
A reception strength determination unit that determines whether or not the reception signal strength measured by the reception strength measurement unit is greater than or equal to a reference value;
Whether or not the communication method related to the received signal for which the received signal strength is determined to be equal to or higher than the reference value by the received strength determining unit is a communication method capable of communication depending on whether or not the received signal can be demodulated . A communication method determination unit for determining
A reception quality determination unit that determines whether or not the reception quality of the received signal determined to be a communication method capable of communication by the communication method determination unit is greater than or equal to a reference value;
On the basis of the carrier information contained by the reception quality determining unit in the broadcast information obtained from the reception signal determined the reception quality is equal to or greater than the reference value, the base station apparatus that transmitted the received signal is utilized available-base A base station determination unit that determines whether or not a station device,
The search control unit causes the base station search unit to execute search processing for a plurality of reception frequency bands that can be received by the radio transmission / reception unit one by one, and the base station search unit searches for the effective base station device. Otherwise, the search process for another reception frequency band is executed, and when the effective base station device is searched by the base station search unit, the base station device is set as a communication partner and the search by the base station search unit is performed. A wireless communication apparatus characterized in that the process is terminated. A wireless transmission / reception unit for transmitting / receiving a signal wirelessly communicated with the base station device;
A base station search unit for searching for an effective base station device based on a received signal received by the radio transceiver unit;
The reception frequency band of the wireless transmission / reception unit is set from frequency bands that can be received regardless of whether or not the frequency band is used by an available base station device, and A search control unit for controlling the search process,
The base station search unit
A reception strength measurement unit for measuring the reception signal strength of the reception signal received by the wireless transmission / reception unit;
A reception quality measuring unit for measuring the quality of the received signal;
A reception strength determination unit that determines whether or not the reception signal strength measured by the reception strength measurement unit is greater than or equal to a reference value;
Whether or not the communication method related to the received signal for which the received signal strength is determined to be equal to or higher than the reference value by the received strength determining unit is a communication method capable of communication depending on whether or not the received signal can be demodulated . A communication method determination unit for determining
A base station apparatus that can be used by the base station apparatus that has transmitted the received signal based on the provider information included in the broadcast information obtained from the received signal determined to be a communication system that can be communicated by the communication system determining unit A base station determination unit that determines whether or not
Together and a reception quality determination unit the reception quality of the received signal is determined to be the available base station apparatus by the base station determining unit determines der than the reference value Luca,
The search control unit causes the base station search unit to execute search processing for a plurality of reception frequency bands that can be received by the radio transmission / reception unit one by one, and the base station search unit searches for the effective base station device. Otherwise, the search process for another reception frequency band is executed, and when the effective base station device is searched by the base station search unit, the base station device is set as a communication partner and the search by the base station search unit is performed. A wireless communication apparatus characterized in that the process is terminated. When the search control unit determines that the communication method determination unit is not capable of communication, or when the reception quality determination unit determines that the reception quality is lower than a reference value, or When it is determined by the station determination unit that it is not a usable base station, it is determined whether there is another radio wave having a received signal strength equal to or higher than a reference value in the set reception frequency band. The wireless communication apparatus according to claim 1, wherein the wireless communication apparatus is caused to execute the processing from the processing of the communication method determination unit, and to perform a searching process for another reception frequency band when the communication method determination unit does not exist.

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