JP4974142B2 - 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.

By the way, 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. For example, in a place where the usage environment is extremely different, such as entering and exiting a tunnel, it is only necessary to perform the area return processing immediately after exiting the tunnel, but it is not possible to return immediately unless the timing of the area return capturing operation is reached. In addition, even if the return-to-area capture processing is performed, it does not immediately lead to return to the area.

In order to solve the above-described problem, a technique is known in which a channel capturing operation is performed when a call operation is performed even when it is determined that the service is out of service (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.

Wireless communication terminal of the present invention to solve the problems described above, a request for starting communication under out-of-range state within a predetermined time is performed, it is scanned a plurality of communication systems, predetermined from becoming out of range condition When a communication start request is made after the time, a control unit is provided that scans the number of communication systems reduced from the plurality.

The radio communication method of the present invention, apparatus is predetermined from a request for starting communication under out-of-range state within a predetermined time is made to scan a plurality of communication systems, equipment, taken out of service state When a communication start request is made after the time, the number of communication systems reduced from the plurality is scanned.

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 description will be given of a communication system to which the wireless communication terminal 10 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.

In the multiband wireless communication terminal 10 having the 11-pattern communication system described above, here, the transition when the out-of-service state is transitioned as a reference for determining whether or not the transmission request issued in the out-of-service state is useless Decided to use time.
Thus, by changing the acquisition procedure of the communication system or the transmission processing method, the battery consumption is suppressed while securing the transmission opportunity.

The range in which one base station 30 can communicate is limited (determined by its performance and network configuration), and communication is possible only when the radio communication terminal 10 is located within this range.
For example, as shown in FIG. 1, the state where the wireless communication terminal 10 is out of service area is (1) moving between areas (small out of service area), (2) moving between areas (out of service area) ), (3) It is considered to be included in one of the three areas that are stationary between areas.

When the wireless communication terminal 10 is moving outside a small area, there is a high possibility that the wireless communication terminal 10 will move to an adjacent area soon and return to the area. In this case, there is a possibility that the transmission is successful even outside the service area. Therefore, when an out-of-service call request is received by the user, this should be processed, and a call process with a higher success rate should be selected and executed regardless of battery consumption.
In addition, when the wireless communication terminal 10 is stationary between areas or moving outside a larger area than usual, the possibility of returning to the area in the near future is low. In this case, it is considered that the possibility of successful transmission is low. Therefore, when an out-of-service transmission request is received from the user, this should be ignored or a transmission process with less battery consumption should be selected and executed.

  At present, no means has been found for easily and accurately knowing to which situation (1), (2) or (3) the wireless communication terminal 10 belongs. Here, as a method for obtaining this approximately, it is assumed that the wireless communication terminal 10 uses an elapsed time since the transition to the out-of-service state.

As shown in FIG. 2, the relationship between the transition state to the out-of-service area and the out-of-service time is indicated on the time axis. is there.
Paying attention to this, the situation from (1) to a certain time T immediately after the transition outside the area is set as the situation (1), and the period from the certain time T to the return to the area is approximated to the state (2) or (3). The present invention provides a wireless communication terminal 10 that can suppress battery consumption while improving usability by changing the calling process.

Here, “out of service area” means that the wireless communication terminal cannot capture any communication system, turns on the out of service flag inside the wireless communication terminal, and displays the out of service area as an antenna pict on the display unit 14 screen. Is a state in which the area return processing is periodically executed.
In addition, “area return processing” refers to a channel (communication system) that can be used by performing a system scan (reception frequency search) and analyzing a pilot signal broadcast within that frequency if a frequency is found. And when the pilot signal strength exceeds a predetermined level, the communication system is captured and returned to a communicable state (range).

FIG. 3 is a block diagram showing an internal configuration of the radio communication terminal according to Embodiments 1 and 2 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, when the communication unit 1 performs a capture process based on a capture instruction generated within a predetermined time after going out of service under the control of the control unit 8, the first described later In the case where the first capturing process for capturing in the procedure is performed, and the capturing process is performed based on the capturing instruction that has occurred over a predetermined time after the out-of-service state, the second procedure different from the first procedure is used. It has a function of performing a second capturing process for capturing. 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 with respect to the communication unit 1, specifically based on a capture processing start instruction generated within a first predetermined time after entering the out-of-service state. When the capturing process is performed, the EVDO protocol executing unit 83 or the 1x protocol executing unit 84 is caused to perform a first capturing process for capturing in a first procedure described later.
Further, the communication system selection unit 85 performs the EVDO protocol execution unit 83 or the 1x protocol execution unit 84 when performing the capture process based on the capture process start instruction that has occurred beyond the first predetermined time after the out-of-service state. The second acquisition process is performed in which acquisition is performed in a second procedure different from the first procedure.
The communication system selection unit 85 stores the time of transition to the out-of-service state by the timer monitoring by the timer monitoring unit 87, and requests the EVDO protocol execution unit 83 or the 1x protocol execution unit 84 to perform a capture process. It is determined whether or not a first predetermined time (for example, 4 seconds) has been exceeded by comparing the time when the error occurred and the time when the stored out-of-service state is transitioned.

Note that the communication system selection unit 85 instructs the EVDO protocol execution unit 83 or the 1x protocol execution unit 84 to acquire a communication system to be captured, such as an MRU (Most Recently Used) or a PRL (Preferred Roaming List) prepared in advance. A scan list in which the securable communication systems are stored in a predetermined order may be referred to.
The MRU is data in which the order is defined so that the communication system selected most recently is stored at the head position and is preferentially selected. The PRL is stored in association with a plurality of communication systems for each of EVDO and 1x, and EVDO and 1x are 2 GHz, new 800 MHz, and old in the plurality of communication systems so that EVDO has priority in EVDO. Further, the data is ordered so that the primary channel is preferentially selected over the secondary channel so as to be prioritized in the order of 800 MHz. It is assumed that the scan list referred to here is sequentially written whenever a power supply is turned on and the storage area is secured in the storage unit 7 and a capture trial (system scan) is performed.
In addition, the difference between the “first acquisition process for acquisition in the first procedure” and the “second acquisition process for acquisition in the second procedure” is, for example, the number of acquisition attempts of the communication system. Or the difference in the order of acquisition trials of the communication system, etc., and these differences are influenced by the battery consumption when driving the mobile phone.

The acquisition instruction function execution unit 86 has a function of instructing the communication system selection unit 85 to start acquisition processing of the communication system. Specifically, the acquisition instruction function execution unit 86 is in a state where it is determined that the communication is out of service. When a communication start request is made, a capture process start instruction is given to the communication system selection unit 85 to instruct capture of any of the plurality of communication systems, and the capture success is notified in response to the capture process start instruction. In this case, a communication start process is performed by the communication system that has been successfully captured.
The capture instruction function execution unit 86 also issues a new acquisition to the communication system selection unit 85 when a capture failure is notified from the communication system selection unit 85 in response to the capture process start instruction after performing the capture process start instruction. When a second predetermined time (for example, 4 seconds) elapses without being notified of the capture success from the communication system selection unit 85 in response to the capture process start instruction, A new acquisition process start instruction (retry) is given to the selection unit 85.

  Note that the passage of the first predetermined time and the second predetermined time is determined by a time-out signal output from the timer monitoring unit 87.

(Embodiment 1)
FIG. 4 is an operation sequence diagram cited for explaining the operation of the wireless communication terminal according to the first embodiment of the present invention. Here, a user interface including the operation unit 2 and the display unit 6, and a control unit are illustrated. 5 and the operation sequence between the base station 30 is shown.
Hereinafter, the operation of the wireless communication terminal according to the first embodiment of the present invention shown in FIG. 3 will be briefly described with reference to the operation sequence diagram of FIG.

In FIG. 4, when the control unit 8 detects an out-of-service state where the mobile phone cannot communicate, the control unit 8 stores the generation time to in a built-in memory (not shown). Subsequently, in the out-of-service state, for example, when a transmission request # 1 is generated when the user operates the operation unit 2 of the mobile phone (pressing a transmission key or the like) (S401), the generation time t1 is further stored. Store in memory.
As a result, the control unit 8 calculates a difference (t1−t0) from the previously stored out-of-service state occurrence time t0 and compares it with a predetermined time (threshold value T) defined in advance. Here, the set threshold value T is determined by the average out-of-service residence time in an actual commercial network, and here, 4 seconds is assumed.

As a result of the comparison, it is assumed here that t1−t0 ≦ T. For this reason, the control unit 8 determines that the mobile phone is in the situation (1) shown in FIG. A system scan according to the first acquisition procedure is performed with the system 30. Here, the process from the comparison with the threshold value T to the execution of the system scan is shown as the transmission process # 1 (S 4 02).
As a result of the system scan based on the transmission process # 1, when the control unit 8 fails to acquire the communication system, the control unit 8 notifies the user interface (display unit 6) of the acquisition failure (S403).

Next, in the out-of-service state, when the user operates the operation unit 2 of the mobile phone 10 to generate a transmission request # 2 (S404), the control unit 8 stores the generation time t2 in the built-in memory again. To do. Subsequently, the control unit 8 calculates a difference (t2−t0) from the previously stored out-of-service state occurrence time t0 and compares it with a predefined threshold T.
As a result of the comparison, it is assumed here that t2−t0> T, and therefore the control unit 8 determines that the mobile phone is in the situation (2) or (3) shown in FIG. Then, a system scan according to the second acquisition procedure is executed with the base station 30.
Here, the process from the comparison with the above-described threshold value T to the execution of the system scan is shown as the transmission process # 2 (S405). Here, the second acquisition procedure refers to a system scan execution schedule that suppresses battery power consumption of the mobile phone, for example, by reducing the number of communication systems to be acquired, compared to the first acquisition procedure. .

  As a result of the system scan based on the transmission process # 2, the control unit 8 displays a message indicating the capture failure via the user interface (display unit 6) when the communication system capture fails (S406).

  FIGS. 5A and 5B are flowcharts showing a specific procedure of the out-of-service calling process of the control unit 8 described above. Hereinafter, the operation of the wireless communication terminal according to the first embodiment of the present invention shown in FIG. 3 will be described in detail with reference to the flowcharts of FIGS.

When the capture instruction function execution unit 86 first detects an out-of-service state in which the mobile phone cannot communicate (S501 in FIG. 5A), the capture instruction function execution unit 86 refers to the output of the timer monitoring unit 87 and stores the out-of-service state in the built-in memory. The generation time to is stored (S502).
In the above-mentioned out-of-service state, for example, when a call request # 1 is generated and output when the user operates the operation unit 2 of the mobile phone (presses a call key or the like) (S503 “Yes” in FIG. 5B) The capture instruction function execution unit 86 refers to the output of the timer monitoring unit 87, stores the generation time t1 of the transmission request in the built-in memory (S504), and the difference from the previously stored out-of-service state generation time t0. (T1-t0) is calculated and compared with a preset time threshold value T (S505).

As a result of the comparison, if it is determined that t1−t0 ≦ T, the communication system selection unit 85 determines that the mobile phone is in the situation (1) illustrated in FIG. 1 and executes the EVDO protocol execution unit 83 or the 1x protocol. The system 84 is instructed to execute the system scan by the capturing procedure # 1, which is the first capturing procedure (S506).
On the other hand, when it is determined that t1−t0> T, the communication system selection unit 85 determines that the mobile phone is in the situation (2) (3) shown in FIG. 1 and the EVDO protocol execution unit 83 or 1x protocol. The execution unit 84 is instructed to execute the system scan by the capturing procedure # 2, which is a second capturing procedure that can be executed while suppressing battery consumption compared to the capturing procedure # 1 (S507).

Upon receiving this, the EVDO protocol execution unit 83 or the 1x protocol execution unit 84 sequentially executes a system scan by the communication system selected according to the acquisition procedure # 1 or the acquisition procedure # 2 with the base station 30, and The result is notified to the communication system selection unit 85.
It is assumed that the out-of-service state does not change at this point. Therefore, the system scan for call request # 1 ends in failure (S508 “No”), and the EVDO protocol execution unit 83 or 1x protocol execution unit 84 selects the communication system. The acquisition failure is notified to the unit 85 (S510).

Further, the communication system selection unit 85 notifies the acquisition instruction function execution unit 86 of the acquisition failure (S510). If the acquisition is successful (S508 “Yes”), the communication system selection unit 85 determines whether the acquisition is successful. Communication processing with the station 30 is started (S511). In steps S506 and S507, if a capture success occurs during a capture attempt, the process may be immediately advanced to step S508 without completing all capture attempts.
On the other hand, in the process of S510, the capture instruction function execution unit 86 displays a message indicating a capture failure via the user interface (display unit 6).

  According to the first embodiment of the present invention described above, a call request based on a user operation sets the situation (1) from immediately after the out-of-service transition to a certain time T, and (2) from a certain time T to the service area return. Or the situation of (3), and by changing the contents of the outgoing call processing based on this situation judgment (first capture procedure and second capture procedure), the battery is improved while improving the usability A wireless communication terminal that can suppress consumption can be provided. Here, the usability means a transmission success rate and provision of a transmission opportunity to the user.

(Embodiment 2)
6 (a) and 6 (b) are flowcharts cited for explaining the operation of the wireless communication terminal according to the second embodiment of the present invention. The difference from the first embodiment shown in FIGS. 4, 5 (a), and 5 (b) is that the first embodiment shown in FIGS. In contrast to the transmission request, here, the acquisition start instruction output from the acquisition instruction function execution unit 86 to the communication system selection unit 85 is used.
Hereinafter, the operation of the wireless communication terminal according to the second embodiment of the present invention shown in FIG. 3 will be briefly described with reference to the flowcharts of FIGS.

The capture instruction function execution unit 86 first detects an out-of-service state in which the mobile phone cannot communicate (S601 in FIG. 6A), refers to the output of the timer monitoring unit 87, and sets the out-of-service state occurrence time to Store (S602).
In the above-mentioned out-of-service state, for example, when a transmission request is made by the user operating the operation unit 2 of the mobile phone (pressing a transmission key or the like) (S603 “Yes” in FIG. 6B), the capture instruction function The execution unit 86 outputs a capture process start instruction that instructs the communication system selection unit 85 to execute a system scan for capturing any of the plurality of communication systems.
The communication system selection unit 85 that has received the acquisition processing start instruction selects a communication system (S604), and performs an acquisition trial of the selected communication system to the EVDO protocol execution unit 83 or the 1x protocol execution unit 84. Instructs to perform a system scan.

At this time (S605 “Yes”), the communication system selection unit 85 refers to the output of the timer monitoring unit 87, stores the generation time t3 of the transmission request in the built-in memory (S606), and first acquires the capture instruction function. The out-of-service state occurrence time t0 stored by the execution unit 86 is referred to, a difference (t3-t0) from the time is calculated, and compared with a predefined time threshold T (S607).
As a result of the comparison, when it is determined that t3−t0 ≦ T, the communication system selection unit 85 determines that the mobile phone is in the situation (1) illustrated in FIG. 1 and the EVDO protocol execution unit 83 or 1x protocol. The execution unit 84 is instructed to execute the system scan by the capturing procedure # 1 (S608). On the other hand, when it is determined that t3−t0> T, the communication system selection unit 85 determines that the mobile phone is in the situation (2) (3) shown in FIG. 1 and the EVDO protocol execution unit 83 or 1x protocol. The execution unit 84 is instructed to execute a system scan by the capturing procedure # 2 that can be executed while suppressing battery consumption compared to the capturing procedure # 1 (S609).

Upon receiving this, the EVDO protocol execution unit 83 or the 1x protocol execution unit 84 sequentially executes a system scan by the communication system selected according to the first acquisition procedure or the second acquisition procedure with the base station 30, The result is notified to the communication system selection unit 85 each time.
It is assumed that the out-of-service state does not change at this point. Therefore, the acquisition of the communication system in response to the system scan instruction described above has failed, and the EVDO protocol execution unit 83 or the 1x protocol execution unit 84 notifies the communication system selection unit 85. Notify capture failure.

The communication system selection unit 85 further notifies the capture instruction function execution unit 86 of the capture failure, but the capture instruction function execution unit 86 performs timer monitoring regarding the elapsed time from the start of out-of-service processing. If no timeout (Tmax, which is the third time for giving up the out-of-service call transmission process) is detected from 87 (S611 “No”), a new acquisition process start instruction is output to the communication system selection unit 85.
Receiving this, the communication system selection unit 85 repeatedly executes the processing after S604 instructing the EVDO protocol execution unit 83 or the 1x protocol execution unit 84 to execute the system scan according to the acquisition procedure # 1 or the acquisition procedure # 2. To do.
Here, when a new acquisition processing start instruction is issued (S605 “Yes”), the communication system selection unit 85 selects a communication system (S604), and attempts to acquire the selected communication system. It instructs the EVDO protocol execution unit 83 or the 1x protocol execution unit 84 to execute a system scan. At this time (S605 “Yes”), the communication system selection unit 85 refers to the output of the timer monitoring unit 87 and stores the generation time tn in the built-in memory again (S606). Subsequently, a difference (tn−t0) from the previously stored out-of-service state occurrence time t0 is calculated and compared with a predefined threshold T (S607). As a result of the comparison, if it is determined that tn−t0> T, the communication system selection unit 85 determines that the mobile phone is in the situation (2) or (3) shown in FIG. A system scan according to acquisition procedure # 2 is executed with the station 30 (S609).

On the other hand, if the acquisition is successful in S610 (S610 “Yes”), the communication process with the base station 30 is started by the communication system that has succeeded in the acquisition (S613). In steps S608 and S609, if a capture success occurs during a capture attempt, the process may be immediately advanced to step S613 without completing all capture attempts.
If a timeout of Tmax time is detected in the process of S611 (S611 “Yes”), the capture instruction function execution unit 86 displays a message indicating capture failure via the user interface (display unit 6) (S612). ).
Although not shown in the flowchart of FIG. 6, the capture instruction function execution unit 86 outputs a capture process start instruction to the communication system selection unit 85 and then selects a communication system in response to the capture process start instruction. Even when the acquisition success or failure is not notified from the unit 85 and a second predetermined time (for example, 4 seconds) has elapsed, a new acquisition processing start instruction is issued to the communication system selection unit 85 ( To retry). As a result, each time a retry occurs, the elapsed time is determined from the time of out-of-service transition, so the capture trial can be performed with a capture procedure suitable for the radio wave conditions around the wireless communication terminal that changes every moment, so it succeeds faster. The possibility increases.

  According to the second embodiment of the present invention described above, the situation (1) is defined from the time immediately after the out-of-service transition to a certain time T based on the capture processing start instruction generated by the control unit 8 (capture instruction function execution unit 86). Further, the time from a certain time T to the return to the area can be approximated to the situation (2) or the situation (3), and the content of the outgoing call processing is changed based on this situation judgment (the first capturing procedure, the second The wireless communication terminal capable of suppressing battery consumption while improving usability can be provided.

  According to the first and second embodiments of the present invention described above, the control unit 8 (communication system selection unit 85) performs the first acquisition procedure, the second acquisition procedure according to the elapsed time after the transition to the out-of-service state. The acquisition procedure is switched and the communication system that can be captured by the wireless communication terminal such as MRU and PRL is provided with a plurality of scan lists (reference destinations) stored in different orders, and the above out-of-service state is set. The reference destination may be switched according to the elapsed time after the transition, and the EVDO protocol execution unit 83 or the 1x protocol execution unit 84 may execute the system scan. At this time, the MRU and PRL scan lists are allocated and stored in the storage unit 7. In addition, the time T is fixed in the above-described embodiment. However, the time T may be variable, or two or more types of time T may be provided, and the capture procedure may be selected from three or more types for each elapsed time. Good. Further, it may be shared with a timer that changes the intermittent interval of the in-zone return process that is repeated intermittently.

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 10 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, according to the above-described embodiment of the present invention, the example using EVDO and the 1x communication protocol has been described. However, the present invention is not limited to this and can be applied to a wireless communication terminal using another communication protocol. Needless to say, there is.

It is the figure quoted in order to demonstrate pattern division in case a radio | wireless communication terminal is in an out-of-service state. It is the figure quoted in order to demonstrate the relationship between out-of-service mode and out-of-service elapsed time. 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 of the radio | wireless communication terminal concerning Embodiment 1 of this invention. 5 is a flowchart cited for explaining the operation of the wireless communication terminal according to the first embodiment of the present invention. It is the flowchart quoted in order to demonstrate operation | movement of the radio | wireless communication terminal concerning Embodiment 2 of this invention.

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)

If a communication start request is made within a predetermined time after entering the out-of-service state, a plurality of communication systems are scanned, and if a communication start request is made after a predetermined time after entering the out-of-service state, the number is reduced from the plurality. A wireless communication terminal comprising a control unit that scans a number of communication systems. When a request to start communication is made within a predetermined time after the device goes out of service, a plurality of communication systems are scanned,
When a request to start communication is made after a predetermined time after the device goes out of service, the number of communication systems reduced from the plurality is scanned.
A wireless communication method.

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