JP5005318B2 - Wireless communication terminal and wireless communication method - Google Patents

Description

The present invention particularly relates to a wireless communication terminal and a wireless communication method suitable for use in a wireless communication system that supports multiband.

  A wireless communication terminal applied to CDMA (Code Division Multiple Access) communication starts a channel capturing operation when making / receiving and data communication. Then, configuration information and timing information of the captured channel are acquired, and position registration information and the like are acquired in synchronization with the timing of the acquired channel.

  By the way, the received field strength of the channel may be significantly reduced depending on the usage environment (terrain, building, etc.) of the wireless communication terminal. If the received field strength of the channel is low, the channel radio wave is received. Therefore, it is determined that the channel has not been captured, and the process returns to the within-range return processing. In this area return processing, the wireless communication terminal executes a system scan that performs a channel capturing operation at a predetermined cycle.

  When the wireless communication terminal is out of the service area, the wireless communication terminal turns on a flag (out of service flag) indicating that it is out of service internally. In such a situation, even if the user performs a call operation, it is unlikely that the user can make a call while the out-of-service flag is ON, and the call process has not been started for power saving.

  In addition, once it is determined that the service area is out of service area, the service area return process is performed at a predetermined cycle. However, the time required for the service area return is ignored due to limited communication methods for attempting a system scan for recovery. It is impossible. In addition, even if the return-to-area capture processing is performed, it does not immediately lead to return to the area.

FIG. 5 shows an example of the operation sequence of the area return processing on the time axis. As is clear from FIG. 5, after the wireless communication terminal transitions to the out-of-service state, the wireless communication terminal executes a re-covering process (out-of-service scan) for re-acquiring the communication system. Immediately after that, the re-acquisition trial operation of the communication systems A and B is performed at a relatively short interval, and the interval of the acquisition trial operation is extended with the passage of time (1 to 4 times) (2 seconds → 4 seconds → 8 seconds). This is a so-called “perch search”.
In FIG. 5, the acquisition trial unit is an out-of-service scan of the communication system A and receives notification of acquisition success or failure, and then performs an out-of-service scan of the communication system B and receives notification of acquisition success or failure. The procedure.
On the other hand, when a transmission operation is performed for a transition within a range, a scan based on the transmission operation is executed separately from the above-mentioned out-of-service scan. For this reason, conventionally, a technique for performing a capturing operation of a communication system is known if a call origination operation is performed even when it is determined to be out of range (see, for example, Patent Document 1).
JP 2003-23665 A

  According to the technique disclosed in Patent Literature 1 described above, it is possible to improve the call success rate in the in-area return process. Recently, however, a plurality of frequency bands (for example, 800 MHz, 2 GHz) have become available for one wireless communication terminal, and wireless communication capable of supporting a plurality of (1x, EVDO) communication protocols that can be used. The number of terminals is increasing, and the transmission in the communication method desired by the user is not always performed only by the return recovery processing of a plurality of channels within a single communication system.

The present invention has been made on the basis of the above-described problems. In a wireless communication terminal that can handle a plurality of communication methods, the communication system is captured when a call operation is performed even in a state determined to be out of service. It is an object of the present invention to provide a wireless communication terminal and a wireless communication method that can efficiently perform the connection and try the connection by the communication method desired by the user as much as possible.

In order to solve the above-described problem, a wireless communication terminal according to a first aspect of the present invention includes a communication unit and a first scan that scans a plurality of communication systems in a period according to an elapsed time of the out-of-service state in the out-of-service state. When the communication unit executes the transmission request in the out-of-service state, the communication unit performs a second scan that scans the number of communication systems determined corresponding to the period of the first scan at the time of the transmission request. And a control unit to be executed.

The radio communication method of the present invention, the terminal executes the first scan of scanning a plurality of communication systems in a period corresponding to the elapsed time of the out-of-range state in the out-of-range condition, the terminal, origination request in the out-of-range state In the case of the above, a second scan for scanning the number of communication systems corresponding to the cycle of the first scan at the time of the transmission request is further executed.

According to the present invention, even in a state determined to be out of service area, a radio that can efficiently capture a communication system when a call operation is performed and can try to connect as much as possible by a communication method desired by the user. A communication terminal and a wireless communication method can be provided.

  Prior to the description of the embodiment of the present invention, a supplementary description will be given of a communication system to which a wireless communication terminal can be applied.

  In recent years, in a wireless communication system, frequency bands to be used are effectively used, and frequency band reorganization has been studied in order to match the used frequencies to the global standard specifications. For example, in a wireless communication system using CDMA2000 1x, the Japanese specification 800 MHz band (hereinafter referred to as the old 800 MHz band) is currently used in Japan. This frequency band has been reorganized into the new standard 800 MHz band. Is going to be.

  The old 800 MHz band and the new 800 MHz band have different uplink and downlink frequency allocations among the frequency bands to be used. Against this background, a multi-band wireless communication terminal 10 capable of communication in a current frequency band (old 800 MHz), a new frequency band (new 800 MHz), and a high frequency band (2 GHz) has been developed.

  The multiband-compatible wireless communication terminal 10 performs wireless communication with the base station 30 via a channel assigned by the base station 30. At this time, the radio communication terminal 10 can transmit and receive radio signals in a plurality of frequency bands. Specifically, the current frequency band (old 800 MHz), a new frequency band (new 800 MHz), and a high-frequency frequency Wireless signals can be transmitted and received using a band (2 GHz).

  Band systems defined by 3GPP2 (3rd Generation Partnership Project 2) are assigned to the above-described communication systems of different frequency bands as identification numbers for identifying frequency bands between the base station 30 and the wireless communication terminal 10. ing. For example, in the neighboring base station list in the information notified from the base station 30 to the wireless communication terminal 10, this band class is used for notifying a communication system existing around the wireless communication terminal 10. .

  The current frequency band (old 800 MHz) is classified as band class 3, the new frequency band (new 800 MHz) is classified as band class 0, and the high frequency band (2 GHz) is classified as band class 6. In addition, a primary channel and a secondary channel are assigned to each band class (however, only the primary channel is used in EVDO communication of band class 6), and if a protocol difference (EVDO) is taken into consideration, a total of 11 patterns are obtained. There will be a communication system.

  The out-of-service transmission operation (1) of the multiband-compatible wireless communication terminal having the 11 patterns of communication systems described above will be described below with reference to the operation sequence diagram shown in FIG.

The wireless communication terminal basically has a characteristic of trying to maintain a state in the area. In other words, if a communication list capable of communication (capture) is provided and a scan list is stored, and if a call out operation is not performed when the mobile phone is out of service, a capture instruction is issued from the communication system stored at the head position of the scan list. Thereafter, until the acquisition of the listed communication systems is successful, the communication system acquisition trial process (hereinafter referred to as out-of-service scan) for returning to the service area is repeatedly executed at a constant period (S101). Here, if the elapsed time from the out-of-service transition is long, processing for reducing the number of return processing within the service area is also executed for power saving.
On the other hand, during the process of periodically performing the out-of-service scan in the background, when the wireless communication terminal detects a transmission request generated by a user performing a transmission operation or a transmission request from an application (S102), The process shifts to out-of-service transmission processing, and a capture instruction is output again from the communication system stored at the head position of the scan list. Thereafter, the communication system stored in the scan list is tried until the communication system is successfully captured. Start processing.

Specifically, when the wireless communication terminal detects an out-of-service call request, the wireless communication terminal acquires the communication system A stored at the head position of the scan list as a scan candidate, and first performs a system scan of the communication system A. If acquisition of the communication system A fails, the communication system B stored at the second position in the scan list is acquired, and a system scan of the communication system B is performed.
The communication system scan described above is repeatedly executed for a predetermined time set in the retry timer. When a timeout is detected, the communication system acquisition trial process is started again, and the system scan described above is repeatedly executed. . The above acquisition trial processing of the communication system is automatically terminated when, for example, communication with the base station is not possible even if the transmission operation is continued for 40 seconds.

According to the out-of-service transmission operation (1) described above, the communication system to be captured is the same for both A immediately after the out-of-service state transition and B when a certain amount of time has elapsed after the out-of-service state transition. Immediately after the transition to the out-of-service state, acquisition trial processing by out-of-service scanning is performed at regular intervals. As described above, the out-of-service scan uses the “perch search” method.
The “perch search” is a state in which the so-called “out of service area” is frequently confirmed immediately after the transition to the out-of-service state, because the capture trial process is repeated at relatively short intervals. It is considered that the wireless communication terminal stays outside the stable area.
In addition, compared to the case where some time has passed since the transition to the out-of-service state, the interval of the acquisition trial process of the communication system in the out-of-service scan is longer than that immediately after the out-of-service state transition. Can be said to be in a state that has not been confirmed for a while, and it is difficult to consider that it is a stable out-of-range compared to immediately after the out-of-range state transition. In other words, the surrounding radio wave environment is returning to the area within the range, but the scan interval is long, so it is slower to recognize the return to the area within the range than immediately after the transition outside the range. .

  For this reason, there is a high possibility that the acquisition trial process by out-of-service transmission immediately after the out-of-service state transition will only re-confirm (capture failure) a communication system that has recently failed to acquire. It is thought that there are many. In addition, useless communication system acquisition trial processing also affects current consumption, which hinders battery life extension.

  For this reason, in the out-of-service call operation (2), which will be described later, the communication system subject to out-of-service call processing immediately after the out-of-service state transition is determined based on the elapsed time (out-of-service stay time) after the transition to the out-of-service state. By increasing the number of communication systems that are subject to acquisition trial processing by out-of-service transmission as the out-of-service stay time increases, the battery consumption is suppressed while securing the transmission opportunity.

  FIG. 2 is a block diagram showing an internal configuration of the wireless communication terminal according to the embodiment of the present invention. Here, a mobile phone is illustrated as the wireless communication terminal 10, and the mobile phone includes a communication unit 1, an operation unit 2, an audio processing unit 3, a speaker 4, a microphone 5, a display unit 6, A storage unit 7 and a control unit 8 are included.

  The communication unit 1 captures a plurality of communication systems and connects to a communication network according to a first communication protocol (for example, EVDO) and a second communication protocol (for example, CDMA2000 1x, hereinafter simply abbreviated as 1x). Wireless communication is performed with a base station (not shown). EVDO communication is faster than 1x communication, and 1x communication is different from EVDO communication in that it supports voice communication in addition to data communication.

  In connection with the present invention, under the control of the control unit 8, the communication unit 1 performs time monitoring when starting the capture trial process after being determined to be in the out-of-service state, Acquisition trial processing based on n communication systems when the elapsed time from the first time is first, and acquisition trial processing based on m communication systems (where n> m) at the second time With the function to execute. Details will be described later.

The operation unit 2 has keys to which various functions are assigned, such as a power key, a call key, a numeric key, a character key, a direction key, a determination key, and a call key. These keys are operated by the user. If so, a signal corresponding to the operation content is generated and input to the control unit 8 as a user instruction.

The audio processing unit 3 processes an audio signal output from the speaker 4 and an audio signal input from the microphone 5. That is, the audio input from the microphone 5 is amplified, analog-to-digital converted, and further subjected to signal processing such as encoding, converted into digital audio data, and output to the control unit 8.
Further, the audio processing unit 3 performs signal processing such as decoding, digital-analog conversion, and amplification on the audio data supplied from the control unit 8, converts the audio data into an analog audio signal, and outputs the analog audio signal to the speaker 4.

  The display unit 6 is configured using a display device such as a liquid crystal display panel or an organic EL (Electro-Luminescence) panel, for example, and displays an image corresponding to a video signal supplied from the control unit 8. For example, various information and images such as the phone number of the callee at the time of outgoing call, the phone number of the other party at the time of incoming call, the contents of received mail and outgoing mail, date, time, remaining battery level, success / failure of outgoing call, standby screen, etc. To do.

  The storage unit 7 stores various data used for processing in the control unit 8. For example, a computer program provided in the control unit 8, an address book for managing personal information such as a telephone number or an email address of a communication partner, an audio file for playing a ringtone or an alarm sound, an image file for a standby screen, Various setting data, temporary data used in the program processing, etc. are stored. The above-described storage unit 7 is configured by, for example, a nonvolatile storage device (nonvolatile semiconductor memory, hard disk device, optical disk device, etc.), a randomly accessible storage device (eg, SRAM, DRAM), or the like.

The control unit 8 comprehensively controls the overall operation of the mobile phone. That is, various processes of the mobile phone (voice calls performed via a circuit switching network, creation and transmission / reception of e-mail, browsing of the Internet Web (World Wide Web) site, etc.) are appropriate according to the operation of the operation unit 2 The operation of each block described above (transmission / reception of signals in the communication unit 1, input / output of audio in the audio processing unit 3, display of images on the display unit 6 and the like) is controlled so as to be executed in a simple procedure.
The control unit 8 includes a computer (microprocessor) that executes processing based on a program (operating system, application program, etc.) stored in the storage unit 7, and performs the above-described processing according to a procedure instructed in this program. Execute. That is, instruction codes are sequentially read from programs such as an operating system and application programs stored in the storage unit 7 to execute processing.

When directly related to the present invention, the control unit 8 makes a plurality of requests to the communication unit 1 when a communication start request is made in a state where it is determined that the mobile phone is in an out-of-service state where communication is not possible. The key detection unit 81, the display control unit 82, the EVDO protocol execution unit 83, the 1x protocol execution unit 84, and the communication system selection unit 85 are provided. And a capture instruction function execution unit 86 and a timer monitoring unit 87.
The functions of these blocks are achieved by executing the respective programs stored in the storage unit 7 in the control unit 8, and are actually separated from other blocks in the control unit 8. However, it does not indicate only the built-in components, but represents the processing units separately for the sake of simplicity.

The key detection unit 81 has a function of detecting a transmission operation from the operation unit 2 and starting capture processing by the capture instruction function execution unit 86, and the display control unit 82 is connected via the capture instruction function execution unit 86. Each plays a role as a user interface having a function of displaying the success or failure of the outgoing call on the display unit 6.
The EVDO protocol execution unit 83 functions as a first protocol execution unit that instructs the communication unit 1 to capture using the first communication protocol (EVDO), and the 1x protocol execution unit 84 sends the second communication to the communication unit 1. It functions as a second protocol execution unit that instructs acquisition by the protocol (1x), and executes communication with the base station.

  The communication system selection unit 85 has a function of instructing the communication system to be captured by the communication unit 1, and specifically, a capture trial process start instruction is given from the capture instruction function execution unit 86, and the capture trial process is performed. At this time, a time width for continuing the capture trial process is set according to the elapsed time from the determination that the vehicle is out of service until the start of the capture trial process, and the capture trial process is executed with the time width. Specifically, the EVDO protocol execution unit 83 or the 1x protocol execution unit 84 is caused to perform acquisition trial processing with a base station (not shown).

The communication system selection unit 85 is also instructed to start a capture trial process from the capture instruction function execution unit 86. When performing the capture trial process, the communication system selection unit 85 refers to the timer monitoring unit 87 to perform time monitoring, and transitions to an out-of-service state. elapsed time is running trial acquisition processing against the n-number of the communication system when a first time, trial acquisition processing for the communication system of m when the second time (where, n> m) from Execute.
That is, when the elapsed time from the transition to the out-of-service state is long for the EVDO protocol execution unit 83 or the 1x protocol execution unit 84, the communication system selection unit 85 executes acquisition trial processing by more communication systems. If the elapsed time is short, execution of acquisition trial processing by a relatively small number of communication systems is instructed.

The acquisition instruction function execution unit 86 has a function for instructing the communication system selection unit 85 to start acquisition processing for the communication system. Specifically, the acquisition instruction function execution unit 86 is determined to be in an out-of-service state where communication cannot be performed. When a request to start communication is made, a capture trial process start instruction is issued to instruct the communication system selection unit 85 to capture any of the plurality of communication systems. If a predetermined time elapses before the notification is made (the retry timer expires), an instruction to start acquisition trial processing is again given (retryed) to the communication system selection unit 85.
In addition, when acquisition success is notified in response to the acquisition trial process start instruction, the acquisition instruction function execution unit 86 performs communication start processing by the communication system in which acquisition is successful.

The timer monitoring unit 87 is controlled by the acquisition instruction function executing unit 86, and in addition to the retry timer described above, an elapsed time timer for measuring the out-of-service stay time is prepared, and each performs time monitoring. Therefore, when a transition is made to an out-of-service state where communication is not possible, the timer monitoring unit 87 is activated by the capture instruction function execution unit 86, and time measurement by the timer is started. Note that the timer is reset to “0” when the wireless communication terminal transitions to a range.
Here, the out-of-service state is a state in which neither the EVDO protocol execution unit 83 nor the 1x protocol execution unit 84 can capture the communication system, and the out-of-service flag is turned on and displayed by the capture instruction function execution unit 86. This is a state in which the out-of-range display is performed for the unit 6 and a state in which the communication unit 1 performs the within-range return processing.

  The out-of-service transmission operation (2) of the wireless communication terminal according to the embodiment of the present invention shown in FIG. 2 will be described in detail below with reference to the operation sequence diagram shown in FIG.

First, a transmission request is generated by a user operating a transmission key via the operation unit 2, or a transmission request is generated from an application of a wireless communication terminal. At this time, it is determined whether or not the out-of-service flag is ON, and accordingly, the mobile communication terminal determines whether it is currently in the service area or out-of-service state. Instruct the acquisition trial processing of the communication system based on the transmission, and monitor the elapsed time since the transition to the out-of-service state.
Then, based on the out-of-service stay time measured by the timer, a communication system to be subjected to acquisition trial processing of the communication system by out-of-service transmission is determined. The acquisition trial processing here means that the out-of-service transmission request is received, the wireless communication terminal executes a system scan by the communication systems A, B, C, and D with the base station, and outputs a successful acquisition failure. This process.

In FIG. 3, period A indicates immediately after the out-of-service state transition, a stable out-of-service area in which the interval of the perch search is short, and period B has elapsed for a relatively long time after the transition to the out-of-service state. The search interval is longer for power saving than immediately after transition to the outside of the service area, and indicates a period during which the possibility of transition to the service area is high in the acquisition trial process by out-of-service transmission.
FIG. 4 is a flowchart showing a process flow of a trial of capturing a wireless communication terminal based on out-of-service transmission.

In FIG. 4, when the capture instruction function execution unit 86 receives the out-of-service call request (S401 “Yes”), it determines whether or not the wireless communication terminal is in an out-of-service state (S402). If it is determined (S402 “Yes”), normal within-range call processing is performed.
On the other hand, if it is determined that the communication system is out of service area (S402 “No”), the communication system selection unit 85 is instructed to start acquisition processing of the communication system for out-of-service transmission, and the communication system selection unit receives this 85 refers to a timer that measures the elapsed time (out-of-service stay time) since the transition to the outside of the service area via the timer monitoring unit 87 (S403), and out-of-service stay time A, B, C (where A < A communication system to be subjected to acquisition trial processing determined according to B <C) is determined.
Here, in the case of out-of-service time A, communication system a, in the case of out-of-service time B, communication system ab, in the case of out-of-service time C, communication system abc is set in the scan list, for example (S404, S405, S406). ). It is assumed that the scan list is allocated and stored in a predetermined area of the storage unit 7.

The communication system selection unit 85 determines that the elapsed time from the transition to the out-of-service state to the generation of the transmission request (communication start request) is the first time (for example, within the time frame A shown in FIG. 3). The number of communication systems (for example, communication system a) is m (where m> n) communication systems (for example, communication system a) at the second time (for example, within the time frame B shown in FIG. 3). , B, and c) are selected.
That is, when the elapsed time from the transition to the out-of-service state is long for the EVDO protocol execution unit 83 or the 1x protocol execution unit 84, the communication system selection unit 85 executes acquisition trial processing by more communication systems. If the elapsed time is short, execution of acquisition trial processing by a relatively small number of communication systems is instructed.

  In the communication system setting described above, the area return processing is frequently executed immediately after the transition to the out-of-service state, but the timing of execution of the communication system acquisition trial process for the area return processing with time elapses for power saving. Based on the fact that it takes a long time (perch search), immediately after the transition to the out-of-service state, the transmission success rate is low because the communication system acquisition trial process for returning to the service area is frequently performed, and it is relatively long. This is based on the fact that after the elapse of time, the communication system acquisition trial process for returning to the service area is not frequently performed, so that the possibility of successful transmission outside the service area increases.

Upon receiving the instruction, the EVDO protocol execution unit 83 or the 1x protocol execution unit 84 executes a capture trial process based on the set communication system (the communication system located at the head of the scan list) (S407).
Subsequently, the EVDO protocol execution unit 83 or the 1x protocol execution unit 84 notifies the communication system selection unit 85 of the result of the acquisition attempt by the communication system. Here, when the capture is successful (S408 “Yes”), the capture instruction function execution unit 86 notifies the capture instruction function execution unit 86 via the communication system selection unit 85, and the capture instruction function execution unit 86 that has received this notification Start the local call processing.
On the other hand, when the acquisition fails, the communication system selection unit 85 selects the communication system stored at the next position in the scan list and performs the acquisition trial process on the EVDO protocol execution unit 83 or the 1x protocol execution unit 84. Is instructed to execute.
Thereafter, the EVDO protocol execution unit 83 or the 1x protocol execution unit 84 notifies the communication system selection unit 85 of the success or failure of the acquisition, as described above. In the above acquisition trial process, when a retry timer (not shown) times out or there is no other communication system stored in the scan list (S409 “Yes”), the acquisition instruction function execution unit 86 via the communication system selection unit 85 is performed. On the other hand, the capture failure is notified, and the control unit 8 (display control unit 82) causes the display unit 6 to display the transmission failure.

  In the above-described embodiment of the present invention, the communication system that is the target of the acquisition trial process by out-of-service transmission is divided into three patterns according to the elapsed time after the transition to the out-of-service state, but this is limited to this. Instead, the number of patterns may increase depending on the number of communication systems that can be supported by the wireless communication terminal.

As described above, a relatively long time has elapsed since the transition to the out-of-service state by determining the communication system that is the target of the capture trial process by the out-of-service transmission after the transition to the out-of-service state. To improve the usability by increasing the number of transmission opportunities at the time of the acquisition, and the acquisition trial that is likely to be wasted by making the communication system subject to the acquisition trial process by the out-of-service transmission immediately after the out-of-service state transition appropriate This eliminates the processing, thereby prolonging the life of the battery.
Note that, in principle, the wireless communication terminal has one aspect of returning to the area, and on the other hand, it must also suppress the battery consumption. A method is considered.
For example, the time since transitioning out of service area is divided into multiple time frames such as 10 minutes, 30 minutes, 3 hours, etc. If the time is within 10 minutes, repeat the return process in a cycle of 2 seconds. If it is between 10 minutes and 30 minutes, repeat the return process in a range of 4 seconds. If it is between 30 minutes and 3 hours, repeat the process. It is also conceivable to change the period for retrying the return within the range for each elapsed time frame, such as repeating the return processing within the period. As described above, the time frame for changing the processing for returning to the service area may be used as a criterion for changing the number of communication systems to be captured in the present invention.
In other words, if the time after returning to the area is up to 10 minutes, it is “immediately after returning to the outside of the area”, and therefore the area returning process is performed at a high frequency of 2 seconds. Is less likely to succeed. In other words, in an environment where the out-of-service transmission is requested and the communication system can be successfully captured, there is a high possibility that the return to the service area has succeeded in the first place. Therefore, only the communication system a performs the capturing process even if the transmission within the range is performed within this time frame. And if the time after transition outside the range is between 30 seconds and 3 hours, it is considered that there is a low possibility that it can return to within the area because it has been "a little while after the transition outside the area". Processing is performed at a low frequency such as a cycle of 8 seconds.
That is, since the acquisition attempt has not been made for a maximum of 8 seconds before the timing at which the out-of-service transmission processing is requested, the possibility of successful acquisition is not low. Therefore, when making a transmission within this time frame, the possibility of success is relatively high, so various methods should be tried, and not only communication system a but also b and c are tried. To do. In this way, by applying the time frame for changing the within-range return processing cycle to the present invention, an efficient out-of-range outgoing call processing is tried in consideration of the possibility that the in-range return processing will be successful. Will be able to.

According to the above-described embodiment of the present invention, a mobile phone is exemplified as the wireless communication terminal 10. However, the present invention can also be applied to a PDA (Personal Digital Assistants), a PC (Personal Computer), and a game machine. The effect is obtained.
In addition, the functions of the constituent blocks of the wireless communication terminal of the present invention may be realized entirely by software, or at least a part thereof may be realized by hardware. For example, the processing in the control unit 8 and the data processing in the communication unit 1 and the audio processing unit 3 may be realized on a computer by one or a plurality of programs, and at least a part thereof is realized by hardware. Also good.
In addition, although only the example of EVDO and 1x was shown as a communication protocol, it is not limited to this.

It is an operation | movement sequence which shows the out-of-service transmission operation | movement 1 of the radio | wireless communication terminal corresponding to a multiband. It is a block diagram which shows the internal structure of the radio | wireless communication terminal concerning embodiment of this invention. It is the operation | movement sequence diagram quoted in order to demonstrate operation | movement (out-of-service transmission operation | movement 2) of the radio | wireless communication terminal concerning embodiment of this invention. It is the flowchart quoted in order to demonstrate operation | movement of the radio | wireless communication terminal in connection with embodiment of this invention. It is the operation | movement sequence diagram quoted in order to demonstrate the area return process by a perch search.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Communication part, 2 ... Operation part, 3 ... Audio | voice processing part, 4 ... Speaker, 5 ... Microphone, 6 ... Display part, 7 ... Memory | storage part, 8 ... Control part, 10 ... Mobile phone, 30 ... Base station, 81 Key detection unit 82 Display control unit 83 EVDO protocol execution unit (first protocol execution unit) 84 1x protocol execution unit (second protocol execution unit) 85 Communication system selection unit 86 Acquisition instruction Function execution unit 87: Timer monitoring unit.

Claims (2)

A communication department;
When the communication unit executes a first scan that scans a plurality of communication systems in a cycle according to the elapsed time of the out-of-service state in the out-of-service state, and a transmission request is made in the out-of-service state, A control unit that causes the communication unit to execute a second scan that scans a number of communication systems determined in correspondence with a cycle of one scan;
A wireless communication terminal. The terminal performs a first scan that scans a plurality of communication systems in a cycle according to the elapsed time of the out-of-service state in the out-of-service state,
When a transmission request is made in the out-of-service state, the terminal further executes a second scan that scans a number of communication systems corresponding to the period of the first scan at the time of the transmission request. .

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