JP4663549B2 - Wireless terminal apparatus and control method thereof - Google Patents

Description

  The present invention relates to a wireless terminal device that performs communication by transmitting and receiving wireless signals and a control method thereof.

  In a wireless communication system, if communication traffic in a specific base station increases due to a disaster, an accident, an event, or the like, a congestion state occurs and communication cannot be performed. For this reason, generally, in a wireless communication system, before any communication quality can be maintained, outgoing calls are restricted for each terminal existing in the communication area. When this transmission restriction is implemented, information indicating that transmission restriction is being implemented is transmitted from the base station to the terminal, and further, transmission from the terminal is rejected by the base station.

In the following Patent Document 1, the use reservation information of the empty channel is obtained by using the second control channel that is set separately from the normal standby control channel from the terminal to the base station in a state in which the outgoing call is regulated. A technique is disclosed in which, when a base station receives this reservation information, and confirms whether or not the terminal of the transmission source is a specific terminal that is eligible to use a free channel, and then registers it in the reserved terminal list. Yes. In such a technique, when a free channel that can be allocated is generated, the use permission information of this free channel is transmitted to the terminal by using the second control channel, so that even when call restriction is performed. The wireless communication is enabled for a specific terminal.
JP-A-2002-204477

  Incidentally, in recent years, reorganization of frequency bands has been studied in order to make effective use of frequency bands used in wireless communication systems and to match the used frequency bands with the global standard specifications. For example, in a CDMA2000 1x (Code division Multiple Access 2000 1x) specification wireless communication system, the Japanese specification 800 MHz band is currently used in Japan. That is scheduled. The old 800 MHz band and the new 800 MHz band are different in uplink and downlink allocation in the frequency band to be used. In recent years, multiband compatible terminals capable of communication in the current frequency band (old 800 MHz band), new frequency band (new 800 MHz band), and high frequency band (2 GHz band) have been developed.

  Such communication systems with different frequency bands are often assigned priorities. Which communication system such a multi-band compatible terminal uses directly affects the effective use of the frequency band and greatly affects the entire traffic environment. Furthermore, even when selecting these communication systems, it is difficult for the user of the terminal to increase the time required for the location registration process because traffic is taken into consideration.

  Therefore, the present invention has been made in view of the above circumstances, and a wireless terminal device that can contribute to the improvement of the traffic environment by effectively using the resources of the communication system without increasing the time required for the location registration processing, and its An object is to provide a control method.

In order to solve the above problems, the following means were adopted.
A wireless terminal device according to the present invention is capable of wireless communication in a plurality of communication systems in which priorities are set in advance, and a wireless unit that waits in any one of the plurality of communication systems , Control that performs system reselection processing so that the second communication system having a higher priority than the first communication system waits again in a state where the wireless unit is waiting in the first communication system. and parts, the first index information indicating the free resources of the first communication system, and a storage unit for storing in waiting for the first communication system, the control unit may re-said system when performing the selection process to obtain a second index information indicating the free resources in the second communication system, when the acquired second index information conditions than the first index information is poor It is characterized by controlling the radio section so as to continue waiting by the first communication system.
The controller, when performing the system reselection process, if the second index information is better in condition than the first index information, the control unit sets a radio unit to perform standby by the second communication system. It is characterized by controlling.
When performing the system reselection process, the control unit performs control to maintain standby by the first communication system if the conditions of the second index information and the first index information are the same. It is characterized by.
The control unit performs the system reselection processing intermittently based on a timer.
The control unit does not set the timer when waiting in a communication system with the highest priority among the plurality of communication systems .
The first index information is a connection permission threshold acquired in a connection test process for a base station when performing location registration.
A wireless terminal device according to the present invention is capable of wireless communication in a plurality of communication systems in which priorities are set in advance, and a wireless unit that waits in any one of the plurality of communication systems , A control unit that performs a system reselection process so as to perform standby again for a plurality of other communication systems having a higher priority than the first communication system under a state of waiting in the first communication system ; the first index information indicating the free resources in the first communication system, and a storage unit for storing in waiting for the first communication system, wherein the control unit, the system re-selection process when performing the plurality of the plurality of indicating the free resources in other communication systems other indicators information respectively acquired, any other index information of plurality of the acquired said first index information If remote conditions are poor, and controls the radio section so as to continue waiting by the first communication system.
When performing the system reselection process, the control unit gives priority to a communication system having the highest priority among the plurality of other communication systems, and acquires index information indicating resource availability in the communication system characterized in that it.
The wireless terminal device control method according to the present invention is capable of wireless communication in a plurality of communication systems in which priorities are set in advance, and waits in any one of the plurality of communication systems . A control method for a wireless terminal device that performs system reselection processing for re-waiting in a second communication system having a higher priority than the first communication system in a state of waiting in the communication system of The first step of acquiring and storing first index information indicating the availability of resources in the first communication system that is currently waiting, and the availability of resources in the second communication system during the system reselection process a second step of obtaining a second index information indicating a third step of comparing the second index information obtained in the second step and said first indicator information, before In a third step, when the second indicator information conditions than poor the first index information, characterized in that it comprises a fourth step to continue waiting by the first communication system.
When the system reselection process is performed, if the second index information is better in condition than the first index information, a fifth step of waiting by the second communication system is included.
When performing the system reselection process, if the conditions of the second index information and the first index information are the same, a sixth step of maintaining standby by the first communication system is included.
The system reselection process is intermittently executed based on a timer.
The timer is not set when standby is performed in a communication system having the highest priority among the plurality of communication systems .
The first index information is a connection permission threshold acquired in a connection test process for a base station when performing location registration.
The wireless terminal device control method according to the present invention is capable of wireless communication in a plurality of communication systems in which priorities are set in advance, and waits in any one of the plurality of communication systems . A control method for a wireless terminal device for performing system reselection processing for re-waiting a plurality of other communication systems having higher priority than the first communication system in a state of waiting in the communication system A first step of acquiring and storing first index information indicating the availability of resources in the first communication system that is currently awaiting, and in the system reselection process , a second step, the obtained said plurality of other index information in the second step and the first indicator information ratio to obtain a plurality of other index information indicating the free Fourth step and the third step, in the third step, when the plurality of other index information condition than the both first index information is poor, to continue waiting by the first communication system It is characterized by including.

  According to the present invention, when the index information related to the second frequency band having a higher priority than the first frequency band currently in use is better than the index information related to the first frequency, the second frequency band is Control is performed to switch to the used wireless communication, and wireless communication can be performed at the first frequency even when the second frequency band having a high priority is in a congested state, etc., so that the time required for standby is shortened and communication is performed. System resources can be used effectively to improve the traffic environment.

  Hereinafter, a wireless terminal device and a control method thereof according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a wireless communication system in which a wireless terminal device according to an embodiment of the present invention is used. As shown in FIG. 1, the wireless communication system includes a wireless terminal device (hereinafter referred to as a terminal) 10 and a base station 20. For example, only one base station 20 is illustrated in FIG. 1 for the sake of simplicity. In FIG. 1, only one terminal 10 is shown.

  As illustrated in FIG. 1, the terminal 10 includes a wireless unit 11, a control unit 12, a memory 13, an audio processing 14, a speaker 15, a microphone 16, a display unit 17, and an operation unit 18. The radio unit 11 transmits and receives radio signals to and from the base station 20 via a channel assigned by the base station 20. The wireless unit 11 can transmit and receive wireless signals in a plurality of frequency bands. Specifically, wireless signals can be transmitted and received using a current frequency band (old 800 MHz band), a new frequency band (new 800 MHz band), and a high frequency band (2 GHz band).

  The control unit 12 controls the operation of the terminal 10. Specifically, the audio signal (audio data) included in the signal output from the radio unit 11 is output to the audio processing unit 14, and the audio signal output from the audio processing unit 14 is output to the radio unit 11. In addition, the control unit 12 controls which of the plurality of frequency bands is used by the wireless unit 11 to transmit and receive wireless signals. In addition, the control unit 12 performs standby processing. Here, the standby processing specifies the base station 20 with the best condition for the terminal 10 (base station 20 having the best electric field strength, signal wave-to-interference ratio, etc .: standby base station) and has the base station. The process of constantly receiving radio waves on a channel.

  By the way, the base station 20 is triggered by the occurrence of a communication failure or a congestion state in the base station 20, and the base station 20 moves to a terminal that is in a standby state with respect to its own base station. Redirection, which is a process for prompting switching, is performed. Further, the control unit 12 of each terminal that has received the redirection information selects a high-priority frequency band stored in its own terminal after a predetermined time has elapsed after finishing the redirection process, and for this frequency band Reselection is performed to perform capture processing for standby. In the reselection of the multi-band compatible terminals, priority is set for each communication system (frequency band). For this reason, a multi-band compatible terminal tries to perform a standby operation in a communication system with a high priority as much as possible in reselection.

  Further, the control unit 12 controls the radio unit 11 to perform a location registration and connection test (APersistence Test) to be described later on the base station 20. In addition, the control unit 12 performs display control of the display unit 17 and performs various controls according to the operation content of the operation unit 18. The memory 13 stores various data when the control unit 12 performs processing such as operation, calculation, information expansion, and storage.

  Here, location registration and connection test in a wireless terminal device, particularly a CDMA terminal, will be briefly described using terms defined in 3GPP2. First, one communication system (in this embodiment, a frequency band) has a plurality of channels, and these channels are assigned to each base station 20, and each base station 20 is assigned in such a manner. The communication infrastructure is configured to cover the channels for other communication systems.

  The terminal communicates with the base station 20 thereafter by performing location registration (an action of transmitting a parameter such as the terminal ID of the terminal itself and notifying the network of the location of the terminal) using this one channel. Will do. More specifically, when the power is turned on, the control unit 12 first performs a channel search for the peripheral frequency of the terminal. That is, the control unit 12 controls the radio unit to search for peripheral frequencies in order. There are various methods for this search method, but search is performed in order from the channel belonging to the system with higher or lower priority (in the case of CDMA2000 1x, the transmission wave from the base station 20 is Primary and Secondary Channel). To do. In a high-priority system, if there is a channel with sufficient signal strength, it operates to achieve time synchronization. On the other hand, if there is no channel search, the next priority system channel search is performed.

  Here, the temporal synchronization is synchronization using PN. In the case of CDMA2000 1x, it indicates a state where Pasing Channel can be received (a state where broadcast information can be received), and in the case of EV-DO, Control This refers to the state where the channel can be received, and this state is called the standby state. When performing location registration (that is, in a state where the communication system of the communication system is not connected), first, a connection test (APersistence Test) is performed to check whether transmission is possible to the base station 20 in a standby state.

  This connection test is a test performed before the terminal 10 not connected to the base station 20 transmits a radio signal to the base station 20, and even if a radio signal is transmitted to the base station 20. This is a test to confirm whether it is good or not. A connection test is performed for the purpose of preventing the base station 20 from receiving a large amount of radio signals from a plurality of terminals at one time and falling into a congestion state. By performing this connection test, a threshold value that is information serving as an index indicating the availability of resources of the base station 20 is obtained.

  Specifically, when a terminal that is not connected to Traffic performs transmission such as location registration, transmission is performed using AccessChannel. In particular, when transmission is performed using AccessChannel, control is performed such that transmission power is gradually increased from a low value and transmission is performed at a predetermined interval (Access Attempt). In this Access Attempt, in addition to power and interval, the result of APersistence Test is also used as a parameter for this control.

  The APersistence Test is always performed before power is applied to the transmitter of the radio unit when transmitting by AccessChannel. Therefore, in the CDMA2000 system, Registration, Origination, and PageResponse in the case of a CDMA2000 1x Message. In the case of Message transmission and further EV-DO, it is performed in transmission of UATI Request, RouteUpdate, and ConnectionRequest. This result is called a threshold value.

  Here, in the APersistence Test, a value calculated by the control unit 12 according to the parameter given from the base station 20 and the type of mobile device (normal, maintenance, emergency, etc.) is called a threshold value. This threshold value is information serving as an index indicating the availability of resources of the base station 20, and takes values from “0” to “63”. When this threshold value is small, there are many free resources in the base station 20, and conversely, as the threshold value increases, the free space in the base station resources decreases. That is, if the threshold value is small, many terminals 10 can connect to the base station 20, but if the threshold value is large, for example, the base station 20 is congested and it becomes difficult to connect.

  FIG. 2 is a diagram illustrating an example of a relationship between a failure probability of connection to the base station 20 and a threshold value. In FIG. 2, the horizontal axis represents a threshold value, and the vertical axis represents the failure probability of connection to the base station 20. As shown in FIG. 2, when the threshold value is small, the failure probability is small, but as the threshold value becomes large, the failure probability increases as a quadratic function. When the threshold value is “0”, which is the minimum value, the connection to the base station 20 succeeds with a probability of almost 100%, and when the threshold value is “63”, the connection to the base station 20 is almost 100%. It turns out that it fails with a probability of%.

  This threshold value is stored in the memory 13 in each of the above-described current frequency band (old 800 MHz band), new frequency band (new 800 MHz band), and high frequency band (2 GHz band), that is, for each system. Therefore, for example, there may be a situation where the threshold value in the high frequency band (2 GHz band) is high and the threshold value in the current frequency band (old 800 MHz band) is low.

  Returning to FIG. 1, the audio processing unit 14 performs an expansion process, a D / A conversion process (digital / analog conversion process), and the like on the audio signal output from the control unit 12 and outputs the result to the speaker 15. The audio signal output from 16 is subjected to A / D conversion processing (analog / digital conversion processing) compression processing or the like and output to the control unit 12. The speaker 15 converts the audio signal output from the audio processing unit 14 into sound, and the microphone 16 converts the sound into an audio signal. The display unit 17 includes, for example, a liquid crystal display device, and performs display based on a signal output from the control unit 12. The operation unit 18 includes various operation keys such as a call key, an end key, a numeric keypad, and a soft key, and outputs a signal corresponding to the operation content by the user to the control unit 12.

  The base station 20 includes a radio unit 21 and a control unit 22. The radio unit 21 allocates a channel to the terminal 10 and transmits / receives a radio signal to / from the terminal 10. The radio unit 21 can transmit and receive radio signals in a plurality of frequency bands. Specifically, similarly to the radio unit 11 included in the terminal 10, a radio signal using a current frequency band (old 800 MHz band), a new frequency band (new 800 MHz band), and a high frequency band (2 GHz band). Can be sent and received. The control unit 22 controls which of the plurality of frequency bands is used by the radio unit 21 to transmit and receive radio signals. In addition, the control unit 22 receives a communication failure or a congestion state in the base station 20, and the base station 20 waits for a terminal 10 that is in a standby state with respect to the own base station 20 to another base station. Redirection control, which is a process for prompting switching, is performed.

  By the way, each communication system (frequency band) is assigned a band class in 3GPP2 as an identification number for identification between the base station 20 and the terminal. For example, in the information broadcast from one base station 20 such as a peripheral base station (peripheral channel information) list called N-List, this identification number is used to broadcast a communication system existing in the vicinity. Is used. The above-described current frequency band (old 800 MHz band) is classified as Band Class3, the new frequency band (new 800 MHz band) is classified as Band Class0, and the high frequency band (2 GHz band) is Band Class6. It is classified. Priorities are set in advance in these frequency bands, and Band Class 6 has the highest priority, Band Class 0 has the highest priority, and Band Class 3 has the lowest priority. This Band Class and priority are merely examples, and greatly depend on the infrastructure deployment status of the communication carrier. That is, in this embodiment, the infrastructure deployment situation is such that the traffic is vacant in the order of Band Class 6, Band Class 0, and Band Class 3, and this value may be changed depending on the infrastructure situation.

  Next, the operation of the wireless communication system having the above configuration will be described. 3 and 4 are flowcharts illustrating an example of a standby process performed in the terminal 10. The flowchart shown in FIG. 3 shows the time when the terminal 10 is turned on, when the call is disconnected at the terminal 10, when the terminal 10 goes out of service, or when the terminal 10 returns from out of service (base station 20 At the time the radio wave from is captured).

  When the process is started, the control unit 12 of the terminal 10 performs the above-described standby process (step S11). In other words, standby processing is executed in Band Class 6 having the highest priority, and if standby is possible in Band Class 6, standby is performed in Band Class 6. If standby in Band Class 6 is impossible, standby processing is executed in Band Class 0 with the next highest priority. If you can wait in Band Class0, wait in Band Class0. If standby in Band Class 0 is impossible, standby processing is executed in Band Class 3 having the lowest priority, and the standby is performed in Band Class 3.

  When the standby process is completed, the control unit 12 determines whether or not the standby is a standby in Band Class 6 (step S12). When this determination result is “NO” (when waiting in Band Class 0 or Band Class 3), the control unit 12 starts the operation of the reselection timer (Step S13) and ends the series of processes. On the other hand, when the determination result in step S12 is “YES” (when waiting in Band Class 6), the control unit 12 ends the series of processes without operating the reselection timer.

  When the reselection timer whose operation is started in step S13 in FIG. 3 expires, the flowchart shown in FIG. 4 is started. When the process is started, the control unit 12 first stores the threshold value of the connection test in the currently waiting frequency band in the memory 13 (step S21). That is, when the reselection timer expires, the standby state is once released, so that the threshold value of the connection test in the frequency band that was waiting before the cancellation is made to correspond to the Band Class indicating the in-use frequency band in step S21. 13 is stored. Here, assume that you are waiting in Band Class 3.

  Next, the control unit 12 of the terminal 10 newly performs a standby process (step S22). Specifically, the above-described standby processing is executed in Band Class 6 having the highest priority, and if standby is possible in Band Class 6, it waits in Band Class 6. In addition, when waiting in Band Class6 before the process of step S22, the waiting process in Band Class0, 3 with a low priority is not performed.

  Also, if waiting in Band Class 0 before the processing of Step S22, if waiting in Band Class 6 is impossible, the waiting processing is executed in Band Class 0 having the next highest priority. Note that, when waiting in Band Class 0 before the processing in step S22, standby processing in Band Class 3 having a low priority is not performed. Also, if it was waiting in Band Class 3 before the processing of Step S22, the waiting process in Band Class 6 having the highest priority is first performed, and if waiting in Band Class 6 is impossible, the priority is given next. Execute standby processing with high Band Class0. If standby in Band Class 0 is impossible, standby processing in Band Class 3 that was previously waiting is performed.

  When the standby process in step S22 is completed, the control unit 12 stores the threshold value of the connection test in the frequency band newly standby in step S22 in the memory 13 (step S23). Next, the control unit 12 compares the threshold stored in the memory 13 in step S21 with the threshold stored in the memory 13 in step S23, and the threshold stored in the memory 13 in step S21 is stored in the memory 13 in step S23. It is determined whether it is larger than the threshold value (step S24).

  If the determination result in step S24 is “NO”, standby processing is performed in the frequency band (here, Band Class 3) that was previously waiting (step S25). That is, when the threshold value in the frequency band newly waited in step S22 is larger than the threshold value in the frequency band that was previously waited (the frequency band that was waited before the processing in step S21 is performed), or these threshold values are the same. In this case, it is determined that the condition of the frequency band that was previously waiting is better than the frequency band that was previously waiting, and the standby processing in the frequency band that was previously waiting is maintained. The conditions referred to here include ease of connection when connecting to the base station 20, good communication quality due to a congestion state, and the like. When the process of step S25 is completed, the control unit 12 starts the operation of the reselection timer (step S26) and ends the series of processes.

  On the other hand, when the determination result in step S24 is “YES”, the control unit 12 determines whether or not the new standby is standby in Band Class 6 (step S27). When this determination result is “NO” (when waiting in Band Class 0 or Band Class 3), the control unit 12 starts the operation of the reselection timer (Step S26) and ends the series of processes. On the other hand, when the determination result of step S27 is “YES” (when waiting in Band Class 6), the control unit 12 ends the series of processes without operating the reselection timer.

  If the frequency band that was previously waiting is the same as the frequency band that was newly awaited in step S22, standby in that frequency band is performed regardless of the determination result in step S24. In other words, if the frequency band that was previously listened to is Band Class 6, standby is performed in Band Class 6, and if the frequency band that was previously listened to is Band Class 0, standby is performed in Band Class 0, and the frequency that was previously listened to When the band is Band Class 3, standby in Band Class 3 is performed.

  Specifically, in step S21, although it has transitioned to the standby state, as described above, it is merely synchronized with the transmission wave from the base station 20, and transmission using the Access Channel is performed. In addition, location registration has not yet been performed in the newly acquired frequency band. Therefore, since the location registration in the previous frequency band is valid on the network, the terminal can receive broadcast information of the previous frequency band again (adjust the radio unit to the frequency that was synchronized before, It only returns to temporal synchronization / decoding. For this reason, in step S21 to step S22, it is preferable that the control unit 12 stores information on the standby in the memory and then starts a standby operation to a new frequency.

  If the frequency band that was previously waiting is Band Class 3, there is a possibility of waiting for Band Class 6 or Band Class 0 in the process of step S22. In the above embodiment, when waiting for Band Class 6 in Step S22, the standby is performed for Band Class 6 or Band Class 3 by comparing the threshold with Band Class 3 currently waiting. When waiting for Band Class 0 in step S22, the standby is performed for Band Class 0 or Band Class 3 by comparing the threshold with Band Class 3 currently waiting.

  However, if it is possible to wait for a plurality of Band Classes in Step S22, each Band Class threshold value is compared with the Band Class 3 threshold value that was previously awaited, and the most suitable Band Class standby is performed. May be. For example, if the frequency band that was previously waiting is Band Class3, and can be waited for both Band Class6 and 0 in Step S22, and Band Class0 has the smallest threshold among Band Class6, 0, and 3 thresholds, You may wait with Band Class 0 with the next highest priority instead of Band Class 6 with the highest priority. Even in such a case, it is desirable that the threshold comparison order be performed in the order of priority of the Band Class.

  As described above, according to the present embodiment, the connection test threshold value in the currently standby frequency band is stored, and the connection test threshold value in the newly standby frequency band is higher than the stored threshold value. Is configured to perform standby in the currently waiting frequency band. For this reason, as in a conventional multi-band compatible terminal, a standby operation is performed using only the priority of the communication system as an index in reselection, for example, even if a congestion state occurs in the communication system with the highest priority, It is possible to prevent a situation where an attempt is made to try the operation in this communication system and it takes an extremely long time (for example, about several minutes to several hours). That is, since it is possible to transmit an upstream signal such as location registration and transmission, it is possible to shorten the time, thereby effectively using the resources of the communication system and improving the traffic environment.

  The wireless terminal device and the control method thereof according to an embodiment of the present invention have been described above. However, the present invention is not limited to the above-described embodiment, and can be freely changed within the scope of the present invention. For example, in the above-described embodiment, there is no situation in which standby is performed with a Band Class having a lower priority than the Band Class that was previously waiting, but for example, all Band Class threshold values are acquired and even if the Band Class priority is low. Depending on the threshold value, the standby Band Class may be determined. As a result, for example, even in a situation where the previously waiting Band Class suddenly falls into a congestion state, and all of the Band Classes with higher priority than the last waiting Band Class are in a congestion state, the standby processing is performed. Is possible.

It is a block diagram which shows schematic structure of the radio | wireless communications system with which the radio | wireless terminal apparatus by one Embodiment of this invention is used. It is a figure which shows an example of the relationship between the failure probability of the connection to the base station 20, and a threshold value. 4 is a flowchart illustrating an example of a standby process performed in the terminal 10. 4 is a flowchart illustrating an example of a standby process performed in the terminal 10.

Explanation of symbols

10 terminal 11 radio unit 12 control unit 13 memory 20 base station

Claims (15)

A wireless unit capable of wireless communication in a plurality of communication systems in which priorities are set in advance, and waiting in any one of the plurality of communication systems ;
Control that performs system reselection processing so that the second communication system having a higher priority than the first communication system waits again in a state where the wireless unit is waiting in the first communication system. and parts,
A storage unit for storing first indicator information indicating resource availability in the first communication system while the first communication system is in standby ;
When the system reselection process is performed, the control unit acquires second index information indicating resource availability in the second communication system, and the acquired second index information is more than the first index information. If conditions are poor, the wireless terminal device and controls the radio section so as to continue waiting by the first communication system. The controller, when performing the system reselection process, if the second index information is better in condition than the first index information, the control unit sets a radio unit to perform standby by the second communication system. The wireless terminal device according to claim 1 , wherein the wireless terminal device is controlled. When performing the system reselection process, the control unit performs control to maintain standby by the first communication system if the conditions of the second index information and the first index information are the same. the wireless terminal of claim 1 or 2, characterized in. 4. The wireless terminal device according to claim 1, wherein the control unit performs the system reselection processing intermittently based on a timer. 5. 5. The wireless terminal device according to claim 4, wherein the control unit does not set the timer when waiting in a communication system having the highest priority among the plurality of communication systems. . 6. The wireless terminal device according to claim 1, wherein the first index information is a connection permission threshold acquired in a connection test process for a base station when performing location registration. . A wireless unit capable of wireless communication in a plurality of communication systems in which priorities are set in advance, and waiting in any one of the plurality of communication systems ;
A control unit that performs a system reselection process so as to perform standby again for a plurality of other communication systems having a higher priority than the first communication system under a state of waiting in the first communication system ;
A storage unit for storing first indicator information indicating resource availability in the first communication system while the first communication system is in standby ;
When performing the system reselection process, the control unit acquires a plurality of other indicator information indicating resource vacancy in the plurality of other communication systems, and the acquired other indicator information If the condition is worse than that of the first index information , the wireless terminal device controls the wireless unit to continue standby by the first communication system . When performing the system reselection process, the control unit gives priority to a communication system having the highest priority among the plurality of other communication systems, and acquires index information indicating resource availability in the communication system the wireless terminal of claim 7, characterized in that the. Wireless communication is possible in a plurality of communication systems in which priorities are set in advance, and standby is performed in any one of the plurality of communication systems, and in a state of waiting in the first communication system, A control method for a wireless terminal device that performs system reselection processing for re-waiting in a second communication system having a higher priority than the first communication system ,
A first step of acquiring and storing first indicator information indicating a resource vacancy in the first communication system currently waiting ;
A second step of acquiring second index information indicating a resource vacancy in the second communication system during the system reselection process ;
A third step of comparing the second index information acquired in the second step with the first index information;
And a fourth step of continuing the standby by the first communication system when the second index information is in a condition worse than the first index information in the third step. Control method of the device. The second step of performing the system reselection process includes a fifth step of waiting by the second communication system when the second index information is better in condition than the first index information. Item 10. A method for controlling a wireless terminal device according to Item 9 . 6. When performing the system reselection process, when the conditions of the second index information and the first index information are the same, a sixth step of maintaining standby by the first communication system is included. Item 11. The control method for a wireless terminal device according to Item 9 or 10 . The method of controlling a wireless terminal device according to any one of claims 9 to 11, wherein the system reselection process is intermittently executed based on a timer. The method of controlling a wireless terminal device according to claim 12 , wherein the timer is not set when the communication system having the highest priority among the plurality of communication systems is waiting. The wireless terminal apparatus according to any one of claims 9 to 13, wherein the first index information is a connection permission threshold acquired in connection test processing for a base station when performing location registration. Control method. Wireless communication is possible in a plurality of communication systems in which priorities are set in advance, and standby is performed in any one of the plurality of communication systems, and in a state of waiting in the first communication system, A control method for a wireless terminal device for performing system reselection processing for re-waiting a plurality of other communication systems having higher priority than the first communication system ,
A first step of acquiring and storing first indicator information indicating a resource vacancy in the first communication system currently waiting ;
A second step of acquiring a plurality of other indicator information indicating free resources in the plurality of other communication systems during the system reselection process ;
A third step of comparing the plurality of other indicator information acquired in the second step with the first indicator information;
The third step includes a fourth step of continuing standby by the first communication system when all of the plurality of other index information are worse in condition than the first index information. A control method for a wireless terminal device.

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