KR20090103798A - Wireless terminal apparatus and communication method - Google Patents

Abstract

PURPOSE: A wireless terminal apparatus and a communication method are provided to optimize communications during an emergency. CONSTITUTION: A communication module(11) is operable to transmit and receive a plurality of communication signals via a communication module transceiver. The communication module is also operable to carry out a radio communication with a network side device via a mobile communication network. The communication module transceiver communicates with a first or second base station transceiver via a wireless data communication link. The communication module transceiver cooperates with the base station transceiver with a suitably configured RF antenna arrangement that can support a particular wireless communication protocol and modulation scheme such as, without limitation, the Wi-Fi and CDMA family of industry standards. Each type has a different usage frequency band, and a different communication protocol, but is collectively managed in a concentrated manner in terms of position registration on the network side. That is, position registration of the wireless device to the network side is registered in one of the communication systems, and the call-out in time of incoming call, and the like is performed using the registered communication system. Communication with the network side is efficiently performed through reception of the incoming call from the network side or reception of the annunciation information by monitoring the paging channel in the communication system selected by the communication module.

Description

Communication method with wireless terminal device {WIRELESS TERMINAL APPARATUS AND COMMUNICATION METHOD}

The present invention relates to a mobile radio terminal device and a communication method capable of effectively receiving emergency information such as disaster prevention and crime prevention information.

BACKGROUND ART A communication method of notifying disaster information to a mobile radio terminal device such as a cellular phone is known (see, for example, Patent Documents 1, 2, 3, and 4).

In addition, by using the BCSMS (Broadcast Short Message Service), the user can receive emergency information such as disaster prevention and crime prevention information in the vicinity of the current place even if the user does not register in advance. Emergency information delivery systems are known (see, eg, Patent Document 4). When the occurrence of a disaster such as an earthquake or the like is anticipated in a predetermined area, the information distribution system notifies a corresponding area of the disaster forecast at once.

(Patent Document 1) Japanese Unexamined Patent Application Publication No. 2001-168990

(Patent Document 2) Japanese Unexamined Patent Application Publication No. 2004-96458

(Patent Document 3) Japanese Unexamined Patent Publication No. 2006-5412

(Patent Document 4) Japanese Unexamined Patent Publication No. 2007-148837

In the above-described information delivery system, when an unexpected situation such as a disaster occurs, there is a possibility that a sudden change in the communication state may occur due to the movement of many users who have received emergency information through the mobile phone at once. As a result, there is a possibility that leakage of reception of notification information, congestion of a communication system, or the like may occur. In such a case, there is a possibility that a user who uses a mobile phone encounters a problem that the BCSMS cannot be effectively utilized.

As described above, as an example of a broadcast service for distributing notification information, the BCSMS has been described, but the notification type information distribution method, for example, other information distribution services such as BCMCS (Broad Cast Multi Cast Service) and CBS (Cell Broad Cast) The same problem may also be encountered.

In view of this, there is a need to provide a mobile radio terminal device and a method thereof that can effectively utilize delivery of emergency information.

In the present invention, as a countermeasure for reselection of a communication system, when it is determined that information is to be delivered using a thing that can know the timing of delivery of information in advance by, for example, the value of a broadcast index, The threshold value used in the judgment for shifting to the selection to the communication system is temporarily changed to perform control that is difficult to shift to the processing of the selection to the new communication system.

Further, in the present invention, as a handoff countermeasure, the idle hand is determined when the information is to be delivered by using the information that can be known in advance by the value of the broadcast index. The threshold value used for the off determination is temporarily changed to control the idle handoff.

Further, in the present invention, as a location registration countermeasure, generation of location registration processing is suppressed when the distributed information is emergency information.

In the present invention, as an emergency information countermeasure, when the distributed information is emergency information, the threshold value used for the determination for performing the idle handoff is temporarily raised, so that the idle handoff is less likely to occur.

According to the present invention, there is provided a communication unit capable of wirelessly communicating with a plurality of base stations and a control unit, wherein the control unit comprises a first signal strength and a preset first signal from a first base station in which the communication unit is waiting among the plurality of base stations. Having a handoff processing function of changing a standby base station from the first base station to another base station based on the comparison of one threshold value, and changing the first threshold value upon receiving notification information from the first base station, A movable wireless terminal device is provided.

Preferably, the handoff process performed by the controller is performed when the second signal strength from the second base station that is different from the first signal strength from the first base station is greater and the difference exceeds the first threshold value. The process of changing the standby base station from the first base station to the second base station.

Preferably, the control unit determines whether the notification information includes emergency information, and changes the first threshold value when the notification information includes emergency information.

Also preferably, when the notification information is received, the controller increases the first threshold value so that handoff is unlikely to occur.

Also preferably, the control unit returns the changed first threshold value to the value before the change when the notification information is no longer received.

Preferably, when the control unit receives the notification information, the control unit limits a new location registration of the wireless terminal device to a predetermined time.

Also preferably, the control unit determines whether the notification information includes emergency information, and limits the new location registration of the wireless terminal device for a predetermined time when the emergency information is included.

According to the present invention, there is provided a communication unit capable of wirelessly communicating with a base station and a plurality of communication systems, and a control unit, wherein the control unit includes a first signal strength and a preset second from the base station on which the communication unit is waiting. A notification from the base station, having a reselection processing function for reselecting any one of the plurality of communication systems including a selected communication system that is a communication system used with the base station based on the comparison of threshold values; Upon receiving the information, a movable wireless terminal device is provided which changes the second threshold.

Moreover, according to this invention, the communication method which performs the process mentioned above is provided.

According to the present invention, it is possible to provide a mobile radio terminal device and a method thereof that can effectively utilize the distribution of emergency information.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram showing an overview of message distribution of a BCSMS by a communication system in which a cellular phone is wirelessly connected to a base station as an embodiment of a mobile radio terminal device of the present invention.

2 (a) to 2 (d) are diagrams for explaining a broadcast (BC) slot monitoring operation in a slot mode of a BCSMS;

3 is a block diagram showing an example of a signal processing system of the mobile telephone of this embodiment;

4 is a flowchart showing a threshold value change operation of the mobile phone of this embodiment;

5 is a flowchart showing a position registration control operation of the mobile telephone of this embodiment;

Fig. 6 is a flowchart showing the position registration operation of the mobile phone of this embodiment.

Explanation of symbols for the main parts of the drawings

10: mobile phone 11: wireless communication unit

12: operation unit 13: audio input and output unit

14 display unit 15 imaging unit

16: storage unit 17: control unit

18: system bus 161: threshold change flag

162: location registration control flag 170: location registration control timer

Best Mode for Carrying Out the Invention Embodiments of a movable wireless terminal device of the present invention will be described below with reference to the accompanying drawings.

Examples of the mobile radio terminal device of the present invention include a mobile phone and an electronic device having a wireless communication function such as PDA (Personal Digital Assistants), an electronic notebook, a game machine, and the like. Illustrate a phone.

<Broadcast betrayal>

One of the broadcast distribution services is a broadcast short message service (BCSMS). In the following example, the case where BCSMS is used as an example of the service of broadcast distribution is described.

Fig. 1 is a diagram showing an overview in which a message of a BCSMS is distributed from a base station to a wireless telephone connected to the mobile phone of this embodiment via a communication system.

In BCSMS, message M is generally transmitted per cover area A of base station 100.

The range A is determined by the carrier, but its area can range from hundreds to kilometers. Therefore, the area A of the range A is the maximum of the area where the customer, the audience, etc. which have the mobile telephone 10, such as a specific commercial facility (shopping center), a sports facility (a stadium), or an event venue, etc. gather. It is wider than the width of the unit.

In FIG. 1, the thick solid arrow shows the communication system in which the message M by BCSMS is transmitted.

Although the message M itself can be delivered from the base station 100, the message M is also distributed to users located in other areas. In other words, according to the distribution of information by a normal BCSMS, a service of notifying a message M limited to a specific area only to users located in that area at this time cannot be realized. In this embodiment, this is realized.

When the message (short message) of the BCSMS is transmitted from the base station 100, the user receives the notification message in which the broadcast (BC) index BCAST # INDEX is set to the cellular phone 10, and broadcast (BC). It is known in advance that the BCSMS message is notified in the slot.

The broadcast index (BCAST # INDEX) is a parameter for specifying the monitoring timing of the slot, for example, referring to Figs. 2A to 2D.

The broadcast address BC # ADDR is set in the reception message (notification information message) in the cellular phone 10. The broadcast address BC # ADDR includes a message number (MESSAGE # ID) of a short message, a zone (ZONE # ID) of the base station, a priority (PRIORITY), a language (LANGUAGE), and a service identifier indicating the type of service category ( SERVICE) and the like.

The short message is received by the cellular phone 10 by a reception determination from a combination of priority, service identifier, and language in a field set in the broadcast address BC # ADDR. The mobile phone 10 holds a list of receivable BCSMSs therein, and whether or not reception in the mobile phone 10 is determined by this combination.

The short message is transmitted to a specific slot on the paging channel indicated by the network side, that is, the BC slot.

2A to 2D show an example of monitoring a paging channel including the BC timing monitoring timing (slot mode).

2 (a) shows the slot mode when there is no reception setting of a BCSMS message, FIG. 2 (b) shows the slot mode when there is a reception setting of a BCSMS message, and FIG. 2 (c) shows the normal monitoring timing. 2 (d) shows the monitoring timing of the BC slot. Fig. 2 (c) shows an example in which one cycle is composed of slots of 0 to 63, and Fig. 2 (d) shows an example in which one cycle is composed of slots of 0 to 34.

BC slot "0" shown in FIG. 2 (d) is determined in a cycle different from the normal monitoring timing (wait slot) shown in FIG. 2 (c).

The BC slot is monitored by the cellular phone 10 that is capable of receiving a combination of at least one broadcast address BC # ADDR, and the cellular phone whose BC slot has become a normal standby slot.

The cellular phone 10 can receive a BCSMS message (short message) on the BC slot and, upon determining that it can be received from the contents of the broadcast address BC # ADDR, performs the short message reception process.

The reception processing in the cellular phone 10 means decoding data, storing data, and notifying the user of the reception of data.

<Basic Concept of this Example>

The cellular phone 10 may receive a message including the broadcast index (BCAST # INDEX) before receiving the BCSMS message (short message). In this embodiment, the reception leakage of the short message is reduced by using the reception of the information, and congestion of the communication system due to the user's movement becomes less likely to occur after the reception of the short message.

An advantage of the BCSMS is that the cellular phone 10 can receive in the air, and no access occurs to the base station 100 for receiving information. Therefore, it is possible to minimize the amount of power consumed by the cellular phone with respect to the reception of the information. For example, power consumption is almost the same as in the air.

In addition, as an advantage of the BCSMS, since it does not occupy a resource for communication, there is an advantage that a problem such as congestion of the communication system does not occur.

On the other hand, since BCSMS is also used for emergency information during an earthquake, when a mobile phone receives a BCSMS message when an earthquake occurs, a large number of users move to a new base station by concentrating for evacuation or the like. It is also conceivable that a registration process occurs and at the same time an access to a large number of base stations occurs.

In addition, since information of high urgency such as emergency information is notified in a message of a BCSMS, when a handoff or a reselection or the like occurs, there is a possibility that leakage of reception of emergency information in the mobile phone during the processing period occurs.

In order to reduce the leakage of the message received by the BCSMS, it is desirable to control the BC slot not to be monitored in a short period of time, such as selecting a large number of new communication systems or performing out-of-process processing, at a timing when the message of the BCSMS is notified. .

Reselection measures

In the mobile phone of the present embodiment, when it is determined that the BCSMS message is to be notified by using the value of the broadcast index (BCAST # INDEX), the timing at which the BCSMS message is notified in advance is selected. The reselection threshold value (or the second threshold value), which is a threshold value used for the judgment for transition to the network, is temporarily changed to perform control that is difficult to shift to the process of selecting a new communication system.

Reselection processing means reselection processing of a new base station and communication system. The details will be described later.

Handoff measures

In addition, in this embodiment, when the BCSMS message is notified in advance by using the value of the broadcast index (BCAST # INDEX), when the message is notified, the idle handoff is performed. The handoff threshold value (or the first threshold value), which is a threshold value used for the judgment, is temporarily changed to control the idle handoff state.

In the handoff process, the signal strength from a base station (handoff candidate base station) that is different from the signal strength from the waiting base station (handoff source base station) is greater, and the difference is that the handoff threshold value (first threshold value) is increased. In the above case, the process of changing the standby base station from the base station of the handoff source to the handoff candidate base station. The details will be described later.

Location registration measures

On the other hand, in order to avoid the congestion of the communication system due to the intensive movement of the user of the mobile telephone which has received the emergency information by the mobile telephone, the occurrence of the location registration performed when the location registration area due to the intensive movement of the user is changed is suppressed. It is desirable to.

For this reason, in the present embodiment, when the received BCSMS message is emergency information, generation of location registration processing is suppressed.

Emergency information measures

In the present embodiment, when the received BCSMS message is urgent information, the threshold value (handoff threshold value) used for the determination for performing the idle handoff is temporarily raised, and the idle handoff due to the movement of the user is performed. Control it to be difficult to occur.

By controlling as described above, it is possible to prevent the leakage of the reception of the BCSMS message and to prevent the congestion of the communication system during emergency information due to the reception of the BCSMS message.

<Configuration and basic operation of the wireless terminal device>

Hereinafter, with reference to FIG. 3, the structure and its operation | movement are mentioned about the cellular phone as a preferable embodiment.

The mobile phone 10 includes a control unit 17 which is responsible for the overall control of the mobile phone 10, an antenna ATT, a communication unit 11 which performs wireless communication with a base station via the antenna ATT, and an operation unit 12. ), An audio input / output unit 13, a display unit 14, an imaging unit 15, a storage unit 16, and a control unit 17. The mobile telephone 10 is configured such that each of these portions is commonly connected to a bidirectional system bus 18 having a plurality of lines for address, data, and control.

Although the imaging part 15 is not an essential component requirement as a portable telephone, it is mounted in the portable telephone 10 to which the imaging function was added.

The communication unit 11 has a role of wirelessly communicating with one or more base stations using one or more communication systems. And the communication part 11 captures the radio signal from the predetermined | prescribed base station (100 of FIG. 1) connected to the public communication network which can communicate in any one communication system. In addition, the communication unit 11 performs wireless communication with the base station 100, and performs location registration with respect to the network using a unique terminal ID of the local station or the like.

On the network side, by registering that the cellular phone 10 exists in the location registration area to which the base station 100 belongs, incoming call control and the like can be executed as necessary.

In this manner, after the mobile phone 10 is registered and the mobile phone 10 transitions to the standby state, the communication unit 11 of the mobile phone 10 can transmit and receive various data.

The various types of data are voice data at the time of a voice call, mail data at the time of mail transmission and reception, web page data at the time of web browsing, and the like.

By the way, the communication part 11 can use the some radio system corresponding to several communication system as mentioned above. For example, in the wireless communication of the CDMA2000_1x standard in Japan, there are three types of communication systems. Although each uses a different frequency band and a slightly different communication protocol, centralized management of the location registration of the cellular phone on the network side is collectively managed. In other words, the position registration of the cellular phone to the network side is registered in any one communication system, and calls such as when an incoming call is made are made using the registered communication system preferentially.

Then, by periodically monitoring the paging channel in the communication system selected by the communication unit 11, communication with the network side is efficiently performed by receiving an incoming call from the network side and receiving notification information.

In addition, the communication unit 11 transmits broadcast information (short message) based on a predetermined time slot, that is, a BC slot, or a predetermined packet, on the paging channel transmitted from the base station 100, as will be described later. Receive.

The operation unit 12 has a key to which various functions are assigned, such as a power key, a call key, a numeric key, a character key, a direction key, a decision key, a call key, a function key, and the like.

When these keys are operated by an operator, the operation unit 12 generates a signal corresponding to the operation contents and outputs them to the control unit 17 as an operator's instruction.

The audio input / output unit 13 performs input / output processing of the audio signal output from the speaker SP or the audio signal input from the microphone MIC. That is, the voice input / output unit 13 amplifies the analog voice signal input from the microphone MIC, performs analog / digital conversion, performs signal processing such as encoding on the digital voice signal, and converts the digital voice data into digital voice data. Output to the control unit 17.

In addition, the audio input / output unit 13 performs signal processing such as decoding, digital / analog conversion, amplification, and the like, of the audio data supplied from the control unit 17, converts the audio data into an analog audio signal, and outputs it from the speaker SP.

The display unit 14 is configured by arranging a plurality of pixels (combination of a plurality of light emitting elements) in a matrix form, for example, a liquid crystal display device (LCD) or an organic light emitting display (OLED). And an image according to the video signal supplied from the control unit 17.

The display unit 14 is, for example, the telephone number of the call destination at the time of wireless transmission by the communication unit 11, the telephone number of the caller at the time of incoming call, the contents of the received mail or the sent mail, the date, the time, the mobile phone. The remaining battery capacity of the battery mounted in (10), whether or not the transmission was successful, and the standby screen are displayed.

The imaging unit 15 is a camera constituted by a photoelectric conversion element such as a charge coupled device (CCD) and a complementary metal oxide semiconductor (CMOS) image sensor, and a control circuit thereof.

The storage unit 16 stores various data used for various processes of the mobile phone 10.

The storage unit 16 is, for example, for reproducing a program of a computer executed by the control unit 17 constituted of a computer, an address book for managing personal information such as a telephone number or an e-mail address of a communication partner, a ringing tone or an alarm sound. Audio files, image files for standby screens, various setting data, and temporary data used in the processing of the program are stored.

In the storage unit 16, the threshold value change flag 161 and the position registration control flag 162 are further allocated to the predetermined area and stored. The role of these flags 161 and 162 is mentioned later.

The storage unit 16 is configured by, for example, a nonvolatile memory device such as a nonvolatile semiconductor memory, a hard disk device, an optical disk device, or the like, or a randomly accessible storage device such as an SRAM or a DRAM.

The control unit 17 collectively controls the overall operation of the mobile phone 10. That is, the control unit 17 controls the operation of each component of the above-described mobile phone 10 so that various processes of the mobile phone 10 are executed in a proper order according to the operation of the operation unit 12.

The various processes described above are voice calls made through a circuit-switching network, creation and transmission of electronic mail, and browsing of a web site on the Internet.

The operation of each of the above components is the transmission and reception of signals in the base station and the communication unit 11, the display of the image in the display unit 14, and the like.

The control unit 17 is preferably provided with a computer, for example, a microprocessor, which executes processing based on a program stored in the storage unit 16, for example, an operating system OS, an application program AP, and the like. . The control unit 17 executes the above-described processing in the order instructed by the AP. That is, the control unit 17 sequentially reads command codes from a program such as an OS or an AP stored in the storage unit 16, and executes processing based on the command codes.

The control unit 17 has a main control unit 17a, a handoff processing unit 17b, a reselection processing unit 17c, and a position registration control timer 170 described below.

The position registration control timer 170 is a timer for controlling the registration process of a position.

The handoff processing unit 17b and the reselection processing unit 17c perform the handoff processing described below and the reselection processing of the communication system. In the following description, the processing operation of the control unit 17 refers to the operation of the main control unit 17a.

The reselection threshold value (second threshold value) used for the handoff threshold value (first threshold value) and the reselection threshold value change processing is stored in, for example, the storage unit 16.

The control unit 17 changes the communication system used by the communication unit 11 to control wireless communication.

The control unit 17 first monitors the strength of the signal transmitted from the base station (standby base station) waiting for the location registration in the communication unit 11, and based on the result of the comparison between the signal strength and the first threshold value set in advance. And a handoff processing unit 17b for causing the communication unit 11 to perform a handoff.

The handoff processing performed by the handoff processing unit 17b means that the signal strength from the base station (handoff candidate base station) different from the signal strength from the base station (handoff source base station) on which the main control unit 17a is waiting, When it is determined that the difference exceeds the handoff threshold value (first threshold value), the process of changing the standby base station from the handoff source base station to the handoff candidate base station.

The main control unit 17a of the control unit 17 controls the handoff processing unit 17b to perform such handoff processing.

The main control unit 17a of the control unit 17 changes the handoff threshold value when receiving the notification information from the standby base station waiting for the communication unit 11.

In addition, the control unit 17 monitors the strength of the signal transmitted from the base station in the standby in the communication system selected by the main control unit 17a in the communication unit 11, and the signal strength and the preset second threshold value. On the basis of the comparison result, when the communication unit 11 determines to release the connection with the base station in the selected communication system and reselects the standby base station by using any one of the plurality of communication systems, any one communication Since the process of reselecting the standby base station is performed using the system, the process of the reselection processing unit 17c is controlled.

That is, the reselection processing performed by the reselection processing unit 17c refers to the reselection processing of the base station and the communication system, and performs the following processing.

(a) Once the atmosphere in the selected communication system is released, another communication system is reselected to the communication unit 11 according to a predetermined priority.

(b) sequentially find base stations with good communication status in the selected communication system;

(c) if there is a base station with a good communication state, register the location with respect to the base station as it is,

(d) If a good base station is not found in this communication system, it switches to another communication system, finds the base station again, and performs a series of position registration.

The main control unit 17a of the control unit 17 also changes the reselection threshold value (second threshold value) upon receiving emergency information.

The emergency information is broadcast information specified by the notification information.

The broadcast information may be received in the BC slot, which is the reception time slot set by the notification information, or may be specified in the broadcast information received in the normal waiting slot when it is not emergency information based on the notification information.

The main control unit 17a of the control unit 17 greatly changes the handoff threshold value upon receiving the emergency information.

On the other hand, when the main control unit 17a of the control unit 17 receives the emergency information, the main control unit 17a changes the reselection threshold value (second threshold value) to a small value.

The control unit 17 also returns the handoff threshold and the reselection threshold to the threshold before the change when emergency information is not received based on the notification information from the base station.

In addition, upon receiving the notification information, the main control unit 17a of the control unit 17 sets information for limiting location registration before executing location registration, and also activates the location registration control timer 170, which is a built-in timer. The position registration is performed based on the timeout detection of the position registration control timer 170.

At this time, the main control unit 17a of the control unit 17 detects the timeout of the position registration control timer 170 whose timing differs for each mobile phone, and performs position registration.

<Operation of Mobile Phone>

4-6 is a flowchart which shows operation | movement of the mobile telephone centering on the operation | movement of the main control part 17a of the control part 17 which concerns on embodiment of this invention.

4 shows the operation when the threshold value is changed, FIG. 5 shows the position registration control, and FIG. 6 shows the operation of the position registration.

The BCSMS message (short message) is distributed to a BC slot separate from the idle slot. For this reason, before the base station 100 distributes the BCSMS message to the BC slot, the base station 100 sets the value of the broadcast index (BCAST # INDEX), which is a parameter of the notification information message, on a waiting slot to a value other than 0, for example, a value of 1 to 7. By setting to, the short message is notified that the short message is transmitted to the BC slot.

On the other hand, the mobile telephone 10 transmits the timing at which the short message is notified by the broadcast index BCAST # INDEX, and the short message is delivered by the broadcast address BC # ADR of the notification information message. You can see that.

As shown in the threshold value change flowchart illustrated in FIG. 4, the control unit 17 monitors the BC slot at the timing specified by the broadcast index (BCAST # INDEX) of the notification information message from the base station 100, and further. The broadcast address BC # ADDR is monitored (step S101).

If the broadcast index (BCAST # INDEX) value is a value other than "0" (step S102, YES), the control unit 17 performs a handoff process of changing the standby base station, that is, an "child handoff" process. The BCSMS message reception threshold α (㏈) is added to the handoff threshold value used for the determination of the reception level for starting the signal, and the handoff threshold value is temporarily changed to a level at which the idle handoff cannot be easily started (step S103).

In addition, the control unit 17 adds the BCSMS message reception threshold β (㏈) to the reception level threshold (reselection threshold) at which the communication system starts to be selected, and temporarily selects the operation of the communication system by reselection. The reselection threshold is changed to a level that is difficult to start (step S104).

Changes in the handoff threshold and the reselection threshold will be described later.

Subsequently, the control unit 17 sets (TRUE) the threshold value change flag 161 assigned to the predetermined area of the storage unit 16 to set the threshold value of the idle handoff and the selection value of the communication system. A process of notifying of this change is performed (step S105).

In the above-mentioned example, the case where the short message received by the notification information message includes emergency information is described. However, when the short message specified in the received notification information message does not include emergency information, the idle handoff is performed. It is preferable not to change the handoff threshold value used for the selection and the reselection threshold value used for the selection of the communication system.

Therefore, when the notification information message is received, the main controller 17a of the control unit 17 determines whether or not the emergency information is acquired, and when the emergency information is obtained, the handoff thresholds of steps S103 and S104 and The control unit 17 is configured to skip the process of changing the handoff threshold and the reselection threshold in steps S103 and S104 when the reselection threshold is changed and emergency information is not obtained. can do.

On the other hand, when the parameter value of the broadcast index (BCAST # INDEX) is "0" or when delivery of the BCSMS message (short message) is completed (step S102 "No"), the control unit 17 broadcasts. It is determined whether or not the address BC # ADDR matches its own address (step S106).

If the addresses do not match (step S106 "No"), the control unit 17 further determines the state of the threshold value change flag (step S107). If the threshold value change flag 161 is on (TRUE) (YES in step S107), the controller 17 initializes the idle handoff threshold value to return to the original handoff threshold value (step S108). The reselection threshold is initialized to return to the threshold of selection of the original communication system (reselection threshold) (step S109). Subsequently, the control unit 17 sets the threshold value change flag 161 to OFF (FALSE) to end the series of processes described above (step S110).

If the addresses match in the process of step S106 (step S106 YES), the control unit 17 executes the process of changing the handoff threshold value and the reselection threshold value after step S103, and the threshold value in step S107. If the change flag is set to off (step S107 NO), the control unit 17 ends the above-described series of processes.

<Change of Threshold>

The process of changing the handoff threshold and the reselection threshold is described.

First, a threshold value (handoff threshold value or first threshold value) used for handoff determination will be described.

The control unit 17 of the cellular phone 10 always monitors the signal strength of the radio signal from the base station waiting in the communication unit 11. The control unit 17 also monitors the signal strength of radio signals from other base stations, and controls the handoff for operating the handoff processing unit 17b by comparing the signal strengths of both.

In the present embodiment, the idle handoff is taken as an example. However, the handoff process for operating the handoff processing unit 17b by comparing the signal strengths of the two radio signals is also performed during communication as described above.

Then, the control unit 17 has a signal strength greater than that of the base station (handoff source base station) during standby, and the difference (handoff threshold value or first threshold value) that the difference is used for handoff determination. When exceeding, the communication condition of the communication unit 11 is controlled so as to perform the handoff process by the handoff processing unit 17b.

In this case, "a condition in which it is difficult to hand off by applying the threshold value α (k) for BCSMS message communication" is increased by α (k) as a bias so as to increase the handoff threshold value.

In this way, by changing the handoff threshold value, it is possible to make the control easy to suppress the occurrence of handoff.

Next, the threshold value (reselection threshold value or 2nd threshold value) which determines reselection execution is demonstrated.

As in the handoff process, the control unit 17 always monitors the signal strength of the radio signal from the standby base station waiting for the communication unit 11.

In particular, attention is paid to which communication system is in use.

When the signal strength falls below the threshold value (reselection threshold value or second threshold value) for determining the reselection, and it is determined that the communication system should be reselected, the main control unit 17a of the control unit 17 is determined. ) Controls the communication unit 11 to perform the reselection processing through the reselection processing unit 17c.

In other words, "a condition in which reselection is difficult by adding a threshold value β (k) for receiving a BCSMS message" is reduced by β (k) as a bias so as to reduce the reselection threshold value.

In this way, by changing the handoff threshold value and the reselection threshold value, it is possible to suppress the occurrence of handoff processing or reselection (reselection) of the communication system.

As described above, according to the mobile telephone according to the present embodiment, the handoff threshold and the reselection are made by using the fact that the short message is notified in advance by the value of the broadcast index (BCAST # INDEX). By automatically changing the threshold value, it is possible to construct an environment in which a short message can be received even in a situation where reception leakage is likely to occur due to concentration of the user's movement when the information distribution by the BCSMS is performed. That is, the cellular phone 10 can be controlled so that the BC slot cannot be monitored such as a reselection process of the communication system or a transition to an out of service state at the timing when the short message is notified. It is possible to suppress the leakage of the received short message.

In addition, since the above-described control process is realized without user operation or normal communication process, that is, without the user being conscious, the convenience of the mobile phone is improved. That is, by using the BCSMS, there is an advantage that the mobile phone can receive information in the air, and that access to the base station 100 does not occur from the mobile phone in receiving information. Therefore, it is possible to minimize the amount of power consumed by the mobile phone with respect to the reception of information (a power consumption almost equal to that during standby), and also because it does not occupy a radio resource for communication, thus causing problems such as congestion of the communication system. There is also an advantage that does not occur.

Moreover, the control part 17 has the timer started by time based on the predetermined | prescribed operation | movement, such as communication termination, and the control part 17 is the structure by which the regeneration generation is managed by timeout of this timer. In this case, the timer time may be changed.

Specifically, the control unit 17 may be configured to extend the reception timer of the BCSMS message when an environment in which reselection is difficult to be generated by applying the reception threshold of the BCSMS message. Thus, the selection of the control unit 17 can also suppress the reselection.

<Location registration control processing of the wireless terminal device>

Referring to Figs. 5 and 6, the control when the standby base station is changed by the movement of a user having a mobile phone is described.

For example, when a standby base station is changed due to a movement of a user who has received emergency information or the like notified in a BCSMS message by a mobile phone, the movement of the user is different from the location registration area to which the base station of the handoff source and the base station of the handoff destination belong. Cases can happen.

The location registration area is composed of a certain number of base station groups, and when a specific mobile phone is called from the network side, the mobile phone makes all calls at the base stations in the area where the mobile phone is registered. This is the concept of network construction used to succeed.

Therefore, when the location registration area for incoming call control or the like is the movement of the base station to another location registration area, the location registration area needs to be changed. That is, when the location registration area is changed, it is necessary to perform a location registration operation called "Zone Based Registration" in accordance with the standard specification, and access is generated to the base station 100 from the mobile phone.

Since the BCSMS message is distributed to an unspecified number of mobile phones in the area, it is also conceivable that a large number of users who have received an evacuation recommendation by the mobile phone, such as emergency information, simultaneously move to the same area. In this case, access is made to the base station 100 from a large number of mobile telephones 10 simultaneously, and it is expected that the communication system will temporarily run out. As a result, there is a possibility that a phenomenon such as making a call difficult becomes difficult.

In order to avoid congestion of the communication system due to the intensive movement of the user, it is preferable to suppress the occurrence of the position registration to be executed when the position registration area due to the movement is changed.

In the portable telephone according to the present embodiment, when the received BCSMS message (short message) is emergency information, generation of location registration processing due to movement is suppressed. In addition, when the received short message is urgent information, the main control unit 17a of the control unit 17 temporarily raises the threshold value (handoff threshold value) used for the determination for performing the idle handoff, Control so that idle handoffs are unlikely to occur.

5 and 6, the details of the processing will be described.

As shown in the position registration control flowchart of FIG. 5, the control unit 17 monitors the BC slot at the timing specified by the broadcast index (BCAST # INDEX) of the notification information message from the base station 100, and the BCSMS message (short message). Message) (step S201).

When the control unit 17 determines that the content of the short message received is urgent information (step S202 YES), the control unit 17 allocates and sets a position registration control flag assigned to a predetermined area of the storage unit 16. 162 is set to on (TRUE) (step S203), and the built-in position registration control timer 170 is started (step S204).

If the control unit 17 receives emergency information from the base station 100 even when the location registration area is changed, the location registration control timer 170 in which a count value is defined by a random number without generating "Zone Based Registration" Start up. The use of random numbers is for avoiding the same value between mobile telephones.

The position registration control timer 170 is different from the initial value set by the cellular phone.

On the other hand, when the control unit 17 determines that the content of the short message received in step S202 is other than the emergency information (step S202 "no"), the control unit 17 expires the time registration control timer 170 (time). It is determined whether or not it is out (step S205). If the position registration control timer 170 times out (step S205 YES), the control unit 17 sets the position registration control flag 162 to OFF (FALSE) and ends the series of processing described above. (Step S206).

In this way, when the control unit 17 receives the emergency information, in order to control the communication system when the access is concentrated, the control unit 17 sets the position registration control flag 162 to TRUE before the position information registration to register the position. Is suppressed (step S203), and the position registration control timer 170 is activated (step S204). When the timeout of the position registration control timer 170 is detected (step S205), the control unit 17 turns off the position registration control flag to perform the position registration process (step S206).

Referring to the position registration flowchart illustrated in FIG. 6, when the position registration condition is satisfied (step S211), specifically, when the position registration control timer 170 times out, the control unit 17 registers the position. It is determined whether the control flag 162 is TRUE (step S212). As a result, in the case of FALSE (NO in step S212), the control unit 17 executes the position registration process for the first time (step S213).

In addition, although the position registration control timer 170 was described above with respect to the example in which the count value is defined by random numbers, the timing of the timeout of the position registration control timer 170 is not limited to this example, but the mobile telephones are mutually different. It is good to set it so that it does not match. For example, as another example of the position registration control timer 170, a number obtained by counting 0 to 9 may be used by using the lower 1 bit of the terminal ID inherent to the mobile phone.

As described above, the location registration processing is avoided to be concentrated.

By controlling as described above in the control unit 17, when the emergency information is notified by the BCSMS, the plurality of cellular phones 10 do not simultaneously access the network-side device including the base station 100, thereby making emergency. The runaway state of the communication system at the time of an emergency can be avoided.

As described above, according to the mobile phone according to the present embodiment, emergency information is notified by a BCSMS message (short message) to an unspecified number of users who have a mobile phone in a certain area. Therefore, even when the users of the plurality of mobile phones move simultaneously to the same area, it is possible to avoid the situation that multiple mobile phones 10 are simultaneously accessed by the devices on the network side including the base station 100. In the event of an emergency, the runaway state of the communication system can be avoided. As a result, since a communication system can be secured in an emergency, the probability of success in transmitting at the time of a disaster can be increased. In other words, it becomes possible to contribute to ensuring the convenience of the user of the cellular phone and the safety at the time of a disaster.

According to the mobile phone of this embodiment, the BCSMS reception is known in advance, and the parameters of the handoff threshold and the reselection threshold are automatically changed so that the user's movement is concentrated when the information is distributed by the BCSMS. It is possible to establish a communication environment that can be received even in a situation where leakage is likely to occur. In addition, since it is realized without user operation or normal communication, that is, without the user being conscious, the convenience of the mobile phone is improved. In addition, by controlling the communication state during the location registration process, congestion of the communication system is less likely to occur, thereby ensuring an emergency communication system, thereby improving the convenience of the user using the mobile phone.

In this way, the user's simultaneous movement is predicted at the time of emergency information notification, but a large amount of simultaneous simultaneous location registration can be prevented, and the probability of success in transmission at the time of a disaster can be improved by avoiding congestion of the communication system. It can contribute to ensuring the safety of the user.

This invention is not limited to the above-mentioned embodiment, Various changes and improvement are possible in the range which does not deviate from the summary of this invention.

For example, as an example of a broadcast service for transmitting notification information according to the above-described embodiment, a description was made using BCSMS, but other information distribution services such as BCMCS (Broad Cast Multi Cast Service) and CBS (Cell Broad Cast) It may be. Even in the case of using such other information distribution service, the process may be similarly performed to change the handoff threshold value and the reselection threshold value.

In addition, the following control may be performed in place of the change of the handoff threshold value and the reselection threshold value in the above-described embodiment, or in place of the change of these threshold values.

For example, when the control unit 17 has a timer that starts counting on the basis of a predetermined operation such as communication termination, and the control unit 17 is configured to manage the reselection generation by timeout of this timer. The controller 17 may change the clock time of this timer.

Specifically, when the BCSMS message reception threshold is set to an environment where reselection is unlikely to occur, the control unit 17 can be configured to extend the BCSMS message reception timer.

Even if the control part 17 is comprised in this way, reselection can be suppressed as mentioned above.

As an example of the mobile radio terminal apparatus of the present invention, the mobile telephone 10 is illustrated, but if it has the same configuration and function as the mobile telephone, an electronic device having a wireless communication function other than the mobile telephone, for example, a PDA, Similarly, the present invention can be applied to an electronic notebook and a game machine.

All of the functions of the control unit 17 of the mobile phone 10 having the configuration illustrated in FIG. 3 may be realized by software or at least a part thereof by hardware.

For example, when the notification information is received from the base station, the data processing in the control unit 17 which changes the handoff threshold value and the reselection threshold value may be realized using a computer by one or a plurality of programs. At least a part thereof may be realized in hardware.

This embodiment can also be realized as a method of performing the processing of the mobile telephone.

Claims (27)

A communication unit capable of wirelessly communicating with a plurality of base stations, Control Provided with The control unit, A handoff processing function for changing a standby base station from the first base station to another base station based on a comparison of a first signal strength from a first base station to which the communication unit is waiting among the plurality of base stations and a preset first threshold value; With Changing the first threshold value upon receiving notification information from the first base station, Movable Wireless terminal device. The method of claim 1, The control unit determines whether the notification information includes emergency information, and changes the first threshold value when the notification information includes emergency information. The method of claim 1, The handoff process performed by the controller is When the second signal strength from the second base station that is different from the first signal strength from the first base station is greater and the difference exceeds the first threshold, a standby base station is transferred from the first base station to the second. The process of changing to a base station Wireless terminal device. The method of claim 1, The control unit, when receiving the notification information, increases the first threshold value so that handoff is less likely to occur. The method of claim 4, wherein The control unit returns the changed first threshold value to the value before the change when the notification information is no longer received. The method of claim 1, And the notification information is broadcast information. The method of claim 6, And the broadcast information is received in a broadcast slot which is a reception time slot of a paging channel. The method of claim 6, And the notification information is specified in broadcast information received in a standby slot. The method of claim 1, The control unit, upon receiving the notification information, limits the new location registration of the wireless terminal device for a predetermined time. The method of claim 9, The predetermined time is determined by a unique ID set for each of the wireless terminal devices. The method of claim 9, And the control unit determines whether the notification information includes emergency information, and limits the new location registration of the wireless terminal device for a predetermined time when the notification information includes the emergency information. The method of claim 1, The communication unit can communicate wirelessly by a plurality of communication systems, The control unit, Of the plurality of communication systems including a selected communication system that is a communication system used between the first base station and the second base station based on a comparison between the first signal strength from the first base station and a second preset threshold value; Has a reselection processing function to reselect any one, Upon receiving the notification information from the first base station, changing the second threshold value Wireless terminal device. The method of claim 12, The control unit determines whether the notification information includes emergency information, and changes the second threshold when the emergency information is included. The method of claim 12, The reselection processing function performed by the controller is A process of reselecting any one of the plurality of communication systems when the first signal strength is less than the second threshold; Wireless terminal device. The method of claim 12, The control unit, when receiving the notification information, decreases the second threshold value. Communication unit which can perform wireless communication by base station and plural communication systems, Control Provided with The control unit, The plurality of communication systems including a selection communication system that is a communication system used between the base station based on a comparison of a first signal strength from the base station on which the communication unit is waiting and a second preset threshold value. Has a reselection processing function to reselect any of Upon receiving notification information from the base station, changing the second threshold value; Movable Wireless terminal device. The method of claim 16, The control unit determines whether the notification information includes emergency information, and changes the second threshold when the emergency information is included. The method of claim 16, Reselection processing performed by the control unit, Reselect one of the plurality of communication systems when the first signal strength in the selected communication system is smaller than the second threshold value. Wireless terminal device. The method of claim 16, The control unit, when receiving the notification information, decreases the second threshold value. The method of claim 16, And the notification information is broadcast information. The method of claim 20, And the broadcast information is received in a broadcast slot which is a reception time slot of a paging channel. The method of claim 20, And the notification information is specified in broadcast information received in a standby slot. A communication method used for a mobile radio terminal device that communicates wirelessly with a plurality of base stations, Performing a handoff processing function of changing a standby base station from the first base station to another base station based on a comparison of a first signal strength from a first base station waiting and a first threshold value among the plurality of base stations; Changing the first threshold value upon receiving notification information from the first base station. Communication method. The method of claim 23, And receiving the notification information, restricting a new location registration of the wireless terminal device for a predetermined time. The method of claim 24, And determining whether the notification information includes emergency information, and limiting a new location registration of the wireless terminal device for a predetermined time when the notification information includes emergency information. The method of claim 23, The wireless terminal device can perform wireless communication by a plurality of communication systems, Of the plurality of communication systems including a selected communication system that is a communication system used between the first base station and the second base station based on a comparison between the first signal strength from the first base station and a second preset threshold value; In performing the reselection processing function of reselecting any one, upon receiving the notification information from the first base station, the second threshold value is changed. Communication method. A communication method used for a wireless terminal device capable of wirelessly communicating with a base station and a plurality of communication systems, Any one of said plurality of communication systems including a selected communication system that is a communication system used between said base station based on a comparison of a first signal strength from said base station waiting and a second preset threshold value; In performing the reselection processing function of reselecting, when the notification information from the base station is received, the second threshold value is changed. Communication method.