JP2014060685A - Mobile station device, communication system, communication method and communication program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile station device, a communication system, a communication method and a communication program, capable of actualizing a communication service desired by a user.SOLUTION: A network detector unit detects one or more networks that transmits and receives radio signals. A network selector unit selects at least one network out of the detected one or more networks on the basis of priority preset for each network. A position registration unit requests position registration to the selected network. If the selected network cannot provide the preset service, a display unit displays a network display prompting to select any of the detected one or more networks.

Description

  The present invention relates to a mobile station device, a communication system, a communication method, and a communication program.

  In LTE (Long Time Evolution), which is a standard of wireless communication technology, only packet communication is supported, and voice communication using a circuit switching method cannot be realized only by LTE. In order to perform voice communication in LTE, for example, IMS (IP Multimedia Subsystem) is introduced, VoIP (Voice over Internet Protocol), a method of encoding and compressing voice and transmitting in real time by Internet protocol, and CSFB ( A communication method for realizing voice communication is used, such as Circuit Switched Fallback, CS fallback (voice communication is performed by a circuit switching system). Therefore, for example, when the network does not support CSFB but supports VoIP, the mobile station device conversely supports CSFB but does not support VoIP. Cannot be realized.

Assuming such a case, Non-Patent Document 1 describes that the mobile station apparatus can set an operation mode indicating which of voice communication and data communication is prioritized. For example, a mode in which the LTE network (E-UTRAN: Evolved Universal Terrestrial Radio Access Network) is disabled and other voice communication is used is called voice central, and even if voice communication cannot be realized, it is described as mode data centric using the LTE network. ing.
Non-Patent Document 2 describes specifications for enabling a mobile station apparatus to automatically or manually select a PLMN (Public Land Mobile Network).

UE mode of operation, 3GPP TS 24.301 Technical Specification, 3GPP (3rd Generation Partnership Project), June 27, 2012, V11.3.0, 4.3, p. 27-34 PLMN selection process, 3GPP TS 23.122 Technical Specification, 3GPP, June 27, 2012, V11.2.0, 4.4, p. 16-24

  Here, when a PLMN that cannot realize voice communication is selected, it may be desirable for the user to transition to another PLMN rather than continue to use the selected PLMN as it is. However, if the operation mode described in Non-Patent Document 1 is set and the PLMN described in Non-Patent Document 2 is selected, the PLMN once selected may continue to be used as it is. For example, an LTE network that does not support CSFB and a PLMN (PLMN1) that has a W-CDMA (Wideband Code Division Multiple Access) network, an LTE network that supports CSFB, and a W-CDMA network Consider a case in which a PLMN (PLMN2) is a network candidate to be selected. When the priority of PLMN1 is higher than the priority of PLMN2, or when the priority of PLMN1 is equal to the priority of PLMN2 and PLMN1 is found first, PLMN1 is selected. When the operation mode is voice centric, the LTE network becomes invalid and the W-CDMA network continues to be used. When the operation mode is data centric, the LTE network continues to be used. Therefore, voice communication cannot be realized in a mobile station apparatus that does not support VoIP technology (Voice over LTE) on the LTE network. Setting the operation mode is generally troublesome for the user and tends to be avoided, and even if any one of the operation modes is set, there is a problem that the communication service desired by the user cannot always be realized. It was.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a mobile station apparatus, a communication system, a communication method, and a communication program that can realize a communication service desired by a user.

(1) The present invention has been made to solve the above problems, and one aspect of the present invention includes a network detection unit that detects one or more networks that transmit and receive wireless signals, and the network detection unit includes: A network selection unit that selects at least one of the detected one or a plurality of networks based on a predetermined priority for each network, and a location registration unit that requests location registration in the network selected by the network selection unit When the network selected by the network selection unit is a network that cannot provide a predetermined service, a display that displays a network display that prompts the user to select one or more networks detected by the network detection unit A mobile station apparatus comprising: a unit.

(2) Another aspect of the present invention includes an operation input unit that receives an operation input instructing to select one or a plurality of networks detected by the network detection unit in the mobile station device described above, When the operation input unit does not accept the operation input even after a predetermined time elapses, the display unit displays a network display that prompts the operation input.

(3) According to another aspect of the present invention, in the mobile station apparatus described above, the network detection unit detects one or more networks again, and the display unit detects one or more networks detected again by the network detection unit. The network is displayed in a list.

(4) According to another aspect of the present invention, in the above mobile station apparatus, location registration completion information including service capability information indicating a service that can be provided by the network according to location registration in the network selected by the network selection unit The display unit displays a service display based on the service capability information in association with the network.

(5) According to another aspect of the present invention, in the above mobile station apparatus, the network detection performed by the network detection unit or the location registration performed by the location registration unit is performed at a predetermined time interval. To do.

(6) According to another aspect of the present invention, in the mobile station apparatus described above, the network selection unit is an operation mode in which a network that realizes a predetermined service is preferentially selected, and the operation input unit includes An operation mode related to a service that can be realized by a network that accepts an operation input is set.

(7) According to another aspect of the present invention, in the mobile station apparatus described above, the network selection unit selects a network capable of realizing a service related to the operation mode based on the service capability information.

(8) According to another aspect of the present invention, in the mobile station apparatus described above, the network detection unit determines whether or not it is out of a range in which radio waves from the network selected by the network selection unit can be received. When it is determined that the network selection unit is out of the range, the network selection unit selects one or more of the networks detected by the network detection unit at a predetermined time interval.

(9) Another aspect of the present invention is a communication system including one or a plurality of networks for transmitting and receiving radio signals and a mobile station apparatus, wherein the mobile station apparatus transmits or receives a radio signal. A network detection unit that detects the network detection unit, a network selection unit that selects at least one of the one or a plurality of networks detected by the network detection unit based on a predetermined priority for each network, and the network selection unit When the location registration unit that requests location registration to the selected network and the network selected by the network selection unit are networks that cannot provide a predetermined service, one of the one or more networks detected by the network detection unit Show network display prompting you to choose And that the display unit is a communication system characterized in that it comprises a.

(10) Another aspect of the present invention is a communication method in a mobile station apparatus, wherein the mobile station apparatus detects a network detection process for detecting one or a plurality of networks transmitting and receiving radio signals, and the network detection process. A network selection process for selecting at least one of the detected one or a plurality of networks based on a predetermined priority for each network, and a position for requesting location registration in the network selected in the network selection process Network display that prompts the user to select one or a plurality of networks detected in the network detection process when the network selected in the registration process and the network selection process cannot provide a predetermined service Display Is a communication method characterized by having a shows process a.

(11) According to another aspect of the present invention, at least one of a network detection procedure for detecting one or more networks that transmit and receive radio signals to a computer of a mobile station device, and one or more networks detected in the network detection procedure. A network selection procedure for selecting one network based on a predetermined priority for each network, a location registration procedure for requesting location registration in the network selected in the network selection procedure, and a network selection procedure selected in the network selection procedure When the network is a network that cannot provide a predetermined service, a display procedure for displaying a network display that prompts the user to select one or a plurality of networks detected in the network detection procedure is executed. It is a communication program that.

  According to the present invention, it is possible to realize a communication service desired by a user.

It is a conceptual diagram which shows the communication system which concerns on embodiment of this invention. It is a sequence diagram which shows the process at the time of a mobile station apparatus connecting to PLMN. It is a block diagram which shows the internal structure of the mobile station apparatus which concerns on this embodiment. It is a surface view which shows the external appearance of the mobile station apparatus which concerns on this embodiment. It is the schematic which shows an example of out-of-service display. It is the schematic which shows the example of a network display. It is the schematic which shows an example of a network reselection display. It is the schematic which shows an example of selection mode display. It is the schematic which shows an example of a PLMN list | wrist. It is the schematic which shows the other example of a PLMN list | wrist. It is a flowchart which shows a part (1) of the network selection process example which concerns on this embodiment. It is a flowchart which shows a part (2) of the network selection process example which concerns on this embodiment. It is a flowchart which shows a part (3) of the network selection process example which concerns on this embodiment. It is a flowchart which shows a part (4) of the network selection process example which concerns on this embodiment. It is a flowchart which shows a part (5) of the network selection process example which concerns on this embodiment.

(Overall configuration of communication system)
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a conceptual diagram showing a communication system 1 according to the present embodiment.
The communication system 1 includes a mobile station device 11 and one or a plurality (two in the example shown in FIG. 1) of PLMNs 21-1 and 21-2. The PLMN is a network in which a communication carrier provides a communication service to a user (subscriber). In the following description, these PLMNs may be collectively referred to as PLMN 21. Similarly, when base station apparatuses to be described later are not distinguished from each other or collectively referred to, they may be referred to as base station apparatus 22, base station apparatus 22-1 and the like.

The mobile station device 11 is a device (UE: User Equipment) possessed by a user, and transmits or receives a signal wirelessly with a communication device possessed by a communication partner using the PLMN 21-1 or the like. Is a device that realizes communication with a communication partner. Examples of the mobile station device 11 include a mobile phone, a multi-function mobile phone (so-called smart phone, etc.), a portable information terminal device, and the like.
When there are a plurality of usable PLMNs, as will be described later, the mobile station apparatus 11 selects one of the plurality of PLMNs, and performs communication using the selected PLMN. A selection mode in which a user manually selects a desired PLMN from among a plurality of PLMNs is referred to as a manual mode. A selection mode in which the mobile station device 11 selects a PLMN based on a predetermined priority is referred to as an automatic mode. In the following description, the selection mode may be referred to as a network selection mode. For example, there are data priority and voice priority as an operation mode (mode of operation) which is a reference for the mobile station apparatus 11 to select a PLMN in the automatic mode. That is, the operation mode is a setting mode (UE's usage setting) indicating that the mobile station apparatus 11 selects a PLMN that can provide a specific communication service. These selection modes and operation modes may be set in the mobile station apparatus 11 in advance, or may be set by accepting an operation input by a user.

  The base station devices (eNodeB) 22-1 and 22-2 are constituent elements of the PLMN 21-1 and 22-1 respectively, and between the mobile station device 11 and the backbone network provided in each PLMN 21-1 and 22-1 Is a device for transmitting and receiving signals. Each PLMN 21 typically includes one or a plurality of base station devices 22 arranged at different positions. Cells in which the radio waves transmitted by the respective base station devices 22 reach the coverage area of communication services provided by the PLMN 21-1 and the like.

Each PLMN 21 is identified using a PLMN identifier (PLMN-identity). The PLMN identifier includes a mobile country code (MCC) and a mobile network code (MNC: Mobile Network Code).
Each PLMN 21 may be, for example, an LTE network compliant with LTE, a third generation mobile communication network (3G: 3rd Generation of mobile communications technology), or an EPC (Evolved) that accommodates these in an integrated manner. It may be a network that includes (Packet Core). Note that 3G may also be called W-CDMA (Wideband Code Division Multiple Access) or UMTS (Universal Mobile Telecommunications System), which originally refers to the name of a radio access scheme.

The PLMN includes a core network (CN) in addition to a plurality of base station devices.
The communication service that can be provided by the PLMN depends on whether or not the backbone network includes a component (node) to realize the communication service. In the following description, information indicating whether or not to implement the communication service is referred to as service capability information.
In the LTE network compliant with LTE, a communication service is provided by using IP (Internet protocol). To provide services that have been provided using the CS (Circuit Switched) domain, such as voice communication and SMS (Short Message Service), using the LTE network. , Requires a separate configuration. When the PLMN is an LTE network, for example, an IMS (IP Multimedia Subsystem) for providing a service using IP is provided, and voice communication using VoIP is realized. In addition, when starting voice communication or the like, a CSFB system may be provided that switches from an LTE network to a network having a CS domain, for example, a 3G network.

(Connection to PLMN)
Next, processing when the mobile station apparatus 11 connects to the PLMN 21 will be described.
FIG. 2 is a sequence diagram showing processing when the mobile station apparatus 11 connects to the PLMN 21.
(Step S101) The PLMN 21 transmits broadcast information (System Information) and a synchronization signal from the base station apparatus 22 (FIG. 1) by radio waves at a predetermined time interval (for example, 50 ms). The broadcast information is information regarding the PLMN 21 and includes, for example, a PLMN identifier indicating the PLMN 21. The synchronization signal includes a cell ID indicating the base station device 22. Note that the frequency band of radio waves transmitted by the PLMN 21 varies depending on the PLMN. Thereafter, the process proceeds to step S102.
(Step S102) The mobile station apparatus 11 detects the broadcast signal and the synchronization signal from the base station apparatus 22, and detects the PLMN identifier indicated by the detected broadcast signal and the cell ID indicated by the synchronization signal. As a result, the available PLMN candidates, the frequency band used when using the PLMN, and the base station apparatus 22 are searched (PLMN search). Thereafter, the process proceeds to step S103.

(Step S103) The mobile station apparatus 11 determines a selection mode selected in advance. When the selection mode is the manual mode, the process proceeds to step S104. The case where the determined selection mode is the automatic mode will be described later.
(Step S104) The mobile station apparatus 11 displays a list of detected PLMN candidates (list display). The order of displaying the PLMN candidates is, for example, the order from the highest priority to the lowest. The priority of PLMN will be described later. Thereafter, the process proceeds to step S105.

(Step S105) The mobile station apparatus 11 receives an operation input by the user and selects one of the displayed PLMN candidates. Thereafter, the process proceeds to step S106.
(Step S106) The mobile station apparatus 11 makes a location registration request (attach, attach) to the PLMN 21. The location registration request is a request for registration for communication using the base station device 22 arranged in a location registration area (tracking area) determined for each PLMN 21. Here, the mobile station device 11 generates a location registration request signal indicating that location registration is requested, and transmits the generated location registration request signal to the backbone network of the PLMN 21 via the base station device 22. Thereafter, the process proceeds to step S107.
(Step S107) The mobile station apparatus 11 receives location registration completion information (attach accept) from the backbone network of the PLMN 21 via the base station apparatus 22 (location registration completion notification). The location registration completion information is information indicating that location registration in the PLMN 21 has been accepted, and includes an equivalent PLMN identifier that indicates an equivalent PLMN (equivalent PLMN). The equivalent PLMN is a PLMN indicating that it is equivalent to a PLMN that has already been registered for location. Thereby, the mobile station apparatus 11 can perform communication using the PLMN 21.
In addition, when the location registration to the PLMN 21 is rejected, the mobile station apparatus 11 receives location registration rejection information (attach reject). This indicates that the connection to the selected PLMN has failed. At this time, the mobile station apparatus 11 displays a connection failure display indicating that effect. Thereafter, the process ends.

  If a PLMN for which location registration has already been performed is selected in step S105, a location registration update request (tracking area update) is used instead of executing location registration requests and receiving location registration completion information in steps S106 and S107. ) And reception of location registration update completion information (tracking area update accept). The location registration update request is a request for registration update for communication using the base station device 22 arranged in the location registration area. Thereby, even if the mobile station apparatus 11 moves, the state registered in the service provision area of the PLMN 21 is maintained. The location registration update completion information is information indicating that the location registration update has been completed.

Although the case where the selection mode determined in step S103 is the manual mode has been described above, step S104 is omitted when the selection mode is the automatic mode. In step S105, the mobile station apparatus 11 selects a PLMN having the highest priority among the detected PLMN candidates, and executes steps S106 and S107 for the selected PLMN.
If the mobile station apparatus 11 receives location registration rejection information or location registration update rejection information in step S107, the process returns to step S105, the PLMN having the highest priority is selected, and steps S106 and S107 are executed. May be. By adopting an example of PLMN priority, which will be described later, PLMNs are selected in descending order of priority set initially. In this way, steps S105 to S107 are repeated until the location registration of the PLMN is completed and communication is possible.

  If the mobile station device 11 cannot receive the broadcast information from the PLMN 21 regardless of whether the selection mode is the manual mode or the automatic mode, it is out of the range where the radio wave from the base station device 22 reaches. Indicates that the user is out of service area (hereinafter, sometimes simply referred to as “out of service area”). Here, the mobile station device 11 displays an out-of-service indication indicating that on the display device.

(Example of PLMN priority)
Next, an example of PLMN priority will be described.
As the priority, for example, the priority based on the following i) to vi) may be used as defined in 4.3.3.3 of Non-Patent Document 2. Those satisfying i) have the highest priority, and the priority becomes lower in the order of i) -vi).

  i) HPLMN (Home PLMN, Home PLMN, if there is no EHPLMN (Equivalent Home PLMN, equivalent home PLMN) described later) or EHPLMN with highest priority: The HPLMN is subscribed to the subscriber as a subscriber (Subscriber) PLMN. The EHPLMN is a PLMN equivalent to the HPLMN obtained by the location registration completion information (or location registration update completion information) when performing location registration (or location registration update). Information relating to the HPLMN, that is, the PLMN identifier of the HPLMN and the access technology information indicating the access technology are stored in advance in a SIM (Subscriber Identity Module) provided in the mobile station apparatus 11 as part of the subscriber information. Keep it.

ii) User Control PLMN / Access Technology Selector (SIM) with SIM (User Controlled PLMN Selector Access Access Technology) file, except for the combination of PLMN and access technology selected immediately before.
iii) Operator Control PLMN / Access Technology Selector (PLM Selector with Access Technology) combinations in the SIM, except for the PLMN and access technology combinations selected immediately before.

iv) Other combinations of PLMN and access technology related to high signal quality received in random order, except for the combination of PLMN and access technology selected immediately before.
v) Other combinations of PLMN and access technology, except for the combination of PLMN and access technology selected immediately before in descending order of signal quality, or the combination of PLMN and access technology that can be selected if signal quality is ignored.
vi) Combination of the PLMN and access technology selected immediately before: That is, the mobile station apparatus 11 changes the priority of the combination of the PLMN and access technology selected immediately before to the lowest.

That is, the priority of HPLMN or EHPLMN is the highest, and the priority of the combination of the PLMN and access technology selected immediately before is the lowest. As a result, it is avoided that the combination of the PLMN and the access technology selected immediately before is repeatedly selected, so that the other PLMN or the combination of the access technology and the access technology is not selected. In addition, except for the PLMN (or a combination of this and an access technology) stored in the SIM, a combination of a PLMN and an access method with higher signal quality is selected with higher priority.
In addition, as the above-described signal quality, for example, broadcast information received from the base station apparatus 22 or the electric field strength of a synchronization signal, a signal to noise plus noise ratio (SINR), or the like may be used.

(Outline of this embodiment)
However, even if location registration or location registration update is completed and communication is possible, it is not always possible to realize a desired service using the selected PLMN. Therefore, in this embodiment, any one of the following configurations or any combination thereof is provided.

(A) The mobile station apparatus 11 extracts the service capability information related to the PLMN from the location registration completion information or location registration update completion information received in step S107. The mobile station device 11 determines whether or not a predetermined service (for example, voice communication) can be realized based on the extracted service capability information. If it is determined that the service cannot be realized, the mobile station apparatus 11 performs network display indicating that the service cannot be realized. The user is prompted to select an unselected PLMN, and a clue that can use the communication service desired by the user is obtained.
(B) In (a), the mobile station apparatus 11 may perform a display (network reselection display) that prompts the user to reselect the detected PLMN. This prompts the user to select an unselected PLMN more clearly.

(C) The mobile station apparatus 11 may detect PLMN candidates again (see step S102), and display the list of detected PLMN candidates (see step S104). As a result, newly discovered PLMN candidates are added, and PLMN candidates that can no longer be discovered are excluded.
(D) In (c), the mobile station apparatus 11 makes a location registration request or a location registration update request for each detected PLMN candidate (see step S106), and receives the received location registration completion information or location registration update completion. Service capability information related to the PLMN is extracted from the information. The mobile station apparatus 11 may perform display based on the service capability information of the PLMN in association with the detected PLMN candidate. As a result, a PLMN capable of realizing a service desired by the user can be manually selected.
(E) In (c) or (d), the mobile station apparatus 11 may perform detection of a PLMN candidate or a location registration request or a location registration update request at a predetermined time interval. Thus, the detected PLMN candidate can follow the change due to the change in the position of the mobile station apparatus 11 and the reception state.

(F) In (d), when the service related to the set operation mode is different from the service that can be realized by the selected PLMN, or the service that cannot be realized by the selected PLMN, The operation mode related to the service that can be realized by the selected PLMN is set. As a result, a PLMN that realizes a service desired by the user is selected from the PLMN candidates detected after the next time.

(G) In (f), the mobile station apparatus 11 selects a PLMN capable of realizing a service related to the operation mode in which the extracted service capability information is set, from the detected PLMN candidates. This eliminates the need for the user to perform an operation for selecting a PLMN.
(H) In (c), (d), or (g), the mobile station apparatus 11 determines whether or not the mobile station apparatus 11 is out of the service area that is out of the range where the radio wave from the base station apparatus 22 reaches. When it is determined that the mobile station apparatus 11 is out of the service area and the selection mode is the manual mode, the mobile station apparatus 11 changes the selection mode to the automatic mode, detects the PLMN at a predetermined time interval, and detects the detected PLMN. Choose one. As a result, the mobile station apparatus 11 can select and register the PLMN when it is out of the service area where radio waves from base station apparatuses related to other PLMNs reach.

(Internal configuration of mobile station device)
Next, the internal configuration of the mobile station apparatus 11 according to this embodiment will be described.
FIG. 3 is a block diagram showing an internal configuration of the mobile station apparatus 11 according to the present embodiment.
The mobile station apparatus 11 includes an antenna unit 111, a transmission / reception unit 112, a network detection unit 113, a network selection unit 114, a location registration unit 115, a display unit 116, and an operation input unit 117.

The antenna unit 111 outputs a reception signal in a radio frequency band received by radio waves from the base station device 22 to the transmission / reception unit 112. The antenna unit 111 transmits the reception signal in the radio frequency band input from the transmission / reception unit 112 to the base station apparatus 22 as a radio wave.
The transmission / reception unit 112 down-converts the radio frequency band reception signal input from the antenna unit 111 to generate a base frequency band reception signal, and outputs the generated reception signal to the network detection unit 113 or the location registration unit 115. To do.
The transmission / reception unit 112 up-converts the transmission signal of the base frequency band input from the network detection unit 113 or the location registration unit 115 to generate a transmission signal of the radio frequency band, and outputs the generated transmission signal to the antenna unit 111 To do.

Broadcast information and a synchronization signal are input from the transmission / reception unit 112 to the network detection unit 113 as reception signals received from the base station device 22. The network detection unit 113 calculates a predetermined index value for the input broadcast information and the synchronization signal, and determines whether the calculated index value exceeds a predetermined threshold value for each frequency band, thereby transmitting and receiving. A possible base station device 22 is detected (the above process may be referred to as “cell search”). For example, the electric field strength can be used as the index value.
The network detection unit 113 extracts the PLMN identifier and the cell ID from the broadcast information and the synchronization signal whose index values exceed a predetermined threshold, respectively, and determines the frequency band exceeding the threshold as the frequency band used by the PLMN. The network detection unit 113 associates the extracted PLMN identifier with the extracted PLMN identifier, the cell ID, and the band information indicating the determined frequency band, and outputs the associated information to the network selection unit 114.

The network detection unit 113 determines that the mobile station device 11 is out of the service area when the broadcast information and the synchronization signal whose index value exceeds the threshold value is not detected, and displays the out-of-service display data as an image data storage unit (not shown). And the read out-of-service display data is output to the display unit 116. Thereby, the display unit 116 performs out-of-service display related to out-of-service display data input from the network detection unit 113.
The network detection unit 113 may determine whether the network is out of service for each detected PLMN. The network detection unit 113 outputs an out-of-service signal indicating that it is out of service for each detected PLMN to the network selection unit 114.

When the index value of the broadcast information or the synchronization signal exceeds the threshold value, the network detection unit 113 reads out reception state display data indicating a reception state in a different mode according to the index value from the image data storage unit. The aspect different depending on the index value is, for example, the number of antennas displayed on the display unit 116 when the electric field strength increases. The network detection unit 113 outputs the read reception state display data to the display unit 116. Thereby, the display unit 116 performs reception state display related to the reception state display data input from the network detection unit 113.
Since the above index value is a coefficient indicating the quality of the signal, the network detection unit 113 outputs the index value related to the frequency band from which the PLMN identifier is extracted to the network selection unit 114 in association with the PLMN identifier. May be.

  When there is a PLMN for which location registration has been performed, the network detection unit 113 determines whether or not the mobile station apparatus 11 is out of service for the frequency band of the PLMN. If it is determined that the user is out of the service area, the out-of-service display data is output to the display unit 116 as described above so that the service area is displayed. When the index value calculated for the frequency band of the PLMN exceeds the threshold value, the network detection unit 113 reads reception state display data indicating a reception state of a different aspect according to the index value from the image data storage unit. The network detection unit 113 outputs the read reception state display data to the display unit 116 to display the reception state.

The network selection unit 114 selects one of the PLMN candidates among the PLMN candidates indicated by the PLMN identifier input from the network detection unit 113.
Here, the network selection unit 114 determines the priority for each input PLMN identifier. The priorities described above may be used. When determining the priority, for example, a PLMN identifier stored in the SIM or an index value corresponding to the PLMN input from the network detection unit 113 may be used. The network selection unit 114 rearranges the PLMN identifiers in descending order of the determined priority.

The network selection unit 114 reads selection mode information and operation mode information stored in a mode storage unit (not shown), and determines a selection mode indicated by the read selection mode information and an operation mode indicated by the operation mode information.
The network selection unit 114 outputs the rearranged PLMN identifiers to the display unit 116 when the determined selection mode is the manual mode. Accordingly, the display unit 116 displays the PLMN display indicated by the PLMN identifier input from the network selection unit 114 as the PLMN list in the input order.
The network selection unit 114 determines the PLMN selected by the PLMN indicated by the PLMN identifier input from the operation input unit 117. The network selection unit 114 outputs a PLMN identifier indicating the selected PLMN, a cell ID, and band information to the location registration unit 115.

  When the service capability information is input from the location registration unit 115, the network selection unit 114 enters a state in which the mobile station apparatus 11 can perform communication using the determined PLMN. When the location registration failure information indicating that the location registration has failed is input, the network selection unit 114 cannot perform communication using the selected PLMN. In this case, the network selection unit 114 reads connection failure display data indicating that the connection to the PLMN has failed from the image data storage unit, and outputs the read connection failure display data to the display unit 116. Thereby, the display unit 116 performs connection failure display based on the connection failure display data input from the network selection unit 114.

When the determined selection mode is the automatic mode, the network selection unit 114 selects the PLMN identifier having the highest priority, and outputs the selected PLMN identifier to the location registration unit 115.
The network selection unit 114 determines whether a predetermined service such as voice communication can be realized based on the service capability information input from the location registration unit 115. If it is determined that the service cannot be realized, network display data indicating that the service cannot be realized is read from the image data storage unit, and the read network display data is output to the display unit 116. The display mode of the network display data may be different depending on the operation mode. Thereby, the display unit 116 performs network display based on the network display data input from the network selection unit 114. For example, when the voice priority mode is set, the display unit 116 displays that the network cannot be used. When the data priority mode is set, the display unit 116 displays that voice communication cannot be realized. .

  The network selection unit 114 updates the priority by setting the priorities of the PLMN identifiers selected immediately before among the detected PLMN identifiers to the lowest, and raising the priorities of the unselected PLMN identifiers by one. The network selection unit 114 rearranges the order of the detected PLMN identifiers so as to follow the updated priority order. The network selection unit 114 reads network reselection display data indicating that the user is prompted to reselect a network from the image data storage unit, and outputs the read network reselection display data to the display unit 116. Thereby, the display unit 116 performs network reselection display based on the network reselection display data input from the network selection unit 114. The timing at which the network selection unit 114 performs the network reselection display data may be immediately after the network display data is output to the display unit 116, or after a predetermined time (for example, 1 minute) has elapsed from that point. But you can. When a network reselection signal instructing reselection of a network is input from the operation input unit 117, the network selection unit 114 selects the PLMN identifier having the highest priority.

  The network selection unit 114 may use the newly detected PLMN identifier as the PLMN identifier output to the display unit 116. Here, the network selection unit 114 generates a network detection signal instructing to detect the PLMN, and outputs the generated network detection signal to the network detection unit 113. Accordingly, when the network detection signal is input from the network selection unit 114, the network detection unit 113 outputs the cell ID and band information corresponding to the extracted PLMN identifier to the network selection unit 114. The network selecting unit 114 uses the PLMN identifier input from the network detecting unit 113 as a newly detected PLMN identifier.

  The network selection unit 114 may output the newly detected PLMN identifier, cell ID, and band information to the location registration unit 115. As a result, the location registration unit 115 performs a location registration request or location registration update for each PLMN identifier input from the network selection unit 114, and outputs service capability information or location registration failure information to the network selection unit 114. The network selection unit 114 generates service display data related to a realizable service based on the service capability information input from the location registration unit 115 for each PLMN identifier. The network selection unit 114 outputs the generated service display data and the PLMN identifier in association with each other to the display unit 116. The display unit 116 performs service display based on service display data in association with the PLMN identifier in the PLMN list. An example of service display will be described later.

  The network selection unit 114 determines whether the service related to the determined operation mode is a service that is different from or cannot be realized by the service that can be realized by the service capability information corresponding to the selected PLMN identifier. When it is determined that the service is such, the network selection unit 114 sets an operation mode related to the realizable service, which is the service indicated by the service capability information corresponding to the selected PLMN identifier. For example, the network selection unit 114 changes the operation mode to the data priority mode when the selected PLMN is an LTE network that cannot realize voice communication and can perform data communication. Further, when the selected PLMN is a 3G network capable of realizing voice communication, the operation mode is changed to the voice priority mode.

The network selection unit 114 determines whether or not the extracted service capability information indicates that a service related to the set operation mode can be realized. For example, when the determined operation mode is the voice priority mode, it is determined whether or not the service capability information input from the location registration unit 115 can realize voice communication. For example, when the determined operation mode is the data priority mode, it is determined whether or not the service capability information input from the location registration unit 115 can realize data communication.
When it is determined that it can be realized, the network selection unit 114 determines that the PLMN related to the service capability information is a PLMN used for communication, and stops the process related to the network selection. As a result, the mobile station apparatus 11 is in a state where communication can be performed using the determined PLMN.

When it is determined that it cannot be realized, or when location registration failure information is input from the location registration unit 115, the network selection unit 114 determines again the priority for each input PLMN identifier, for example, as described above. To do. At this time, the priorities of the PLMN identifiers selected immediately before are the lowest, and the priorities of the unselected PLMN identifiers are incremented by one each. Then, the process of selecting the PLMN identifier with the highest priority and the output of the PLMN identifier, cell ID, and band information to the location registration unit 115 are repeated.
For all the input PLMN identifiers, when the service related to the set operation mode cannot be realized or the location registration failure information is input from the location registration unit 115, the network selection unit 114 displays the connection failure display data as an image. Read from the data storage. The network selection unit 114 outputs the read connection failure display data to the display unit 116. Thereby, the display unit 116 performs connection failure display based on the connection failure display data input from the network selection unit 114.

  An out-of-service signal is input from the network detection unit 113 to the network selection unit 114. When the determined selection mode is the manual mode, the network selection unit 114 determines whether or not the out-of-service signal input for the PLMN that has undergone location registration or location registration update is out of service. When the network selection unit 114 determines that the input out-of-service signal indicates that it is out of service, the selection mode information indicating the automatic mode is stored in the mode storage unit. As a result, the selection mode is changed from the manual mode to the automatic mode.

The location registration unit 115 generates a location registration request signal for requesting location registration in the PLMN based on the PLMN identifier input from the network selection unit 114, the cell ID corresponding to the PLMN identifier, and the band information. The location registration unit 115 outputs the generated location registration request signal to the transmission / reception unit 112 as a transmission signal to the base station device 22.
When the location registration completion information is input from the transmission / reception unit 112 as a received signal from the base station apparatus 22, the location registration unit 115 extracts service capability information from the input location registration completion information, and extracts the extracted service capability information. The data is output to the network selection unit 114.
The location registration unit 115 determines that location registration has failed when location registration rejection information or location registration update rejection information is input from the transmission / reception unit 112 as a reception signal from the base station device 22. In addition, the position registration unit 115 determines that the position registration has failed even when the position registration completion information is not input after a predetermined time (for example, 90 seconds) has elapsed after outputting the position registration request information. . In these cases, the location registration unit 115 generates location registration failure information indicating that the location registration has failed, and outputs the generated location registration failure information to the network selection unit 114.

  The display unit 116 displays a screen for realizing the function of the mobile station apparatus 11. For example, a display indicating that an operation input related to the start and end of a communication service such as voice communication and image communication is accepted, and an image and text received from a communication partner in image communication and text communication are displayed. In addition, as described above, an image based on the image data input from the network detection unit 113 or the network selection unit 114 is displayed. The display unit 116 is, for example, a liquid crystal display.

The operation input unit 117 receives an operation input by a user, and executes an operation related to the received operation input or causes another function unit to execute it. Thereby, the function of the mobile station apparatus 11 is implement | achieved. The operation input unit 117 is, for example, a pointing device that detects coordinates at which an operation object such as a finger operated by a user or a stylus pen comes into contact.
In the present embodiment, the display unit 116 and the operation input unit 117 may be a touch panel 118 in which these are integrated. The touch panel 118 displays a screen representing operation buttons and receives an operation input corresponding to the button to which the detected coordinates belong. In the following description, the display unit 116 and the operation input unit 117 are taken as an example in which a touch panel 118 in which these are integrated is used, but the present embodiment is not limited to this. The display unit 116 and the operation input unit 117 may be separate from each other. An example of the screen display displayed on the touch panel 118 will be described later.

In the present embodiment, the detection of the PLMN identifier in the network detection unit 113 and the location registration request or the location registration update request in the location registration unit 115 may be repeatedly performed at a predetermined time interval (for example, every 3 minutes). .
Further, when there are two or more PLMNs for which a location registration request or a location registration update request has been made, a location registration release request (detach, detach) may be made for PLMNs that are not required. The PLMN that is not required is a PLMN that is not likely to be used for data transmission / reception, for example, a PLMN other than the PLMN for which a location registration request or a location registration update request has been made most recently. Thereby, since location registration is not performed more than necessary in the PLMN, an increase in the load related to mobility management of the mobile station apparatus can be suppressed.

Next, an example of service capability information will be described.
In this embodiment, as the service capability information, for example, a message or a value included in location registration completion information or location registration update completion information may be used.
For example, when the service capability information is “SMS (Short Message Service) Only” or “CS Fallback not preferred”, the messages are “short message only” and “CSFB not used”, respectively. The 3GPP TS 24.301 receives this service capability information, and the mobile station apparatus operating in the CS / PS mode 1 does not access the registered LTE network (invalidation), and is GERAN or UTRAN. Is selected to use CSFB.

Here, the CS / PS mode 1 is a voice priority mode in a mobile station apparatus in which both EPS service and non-EPS service are registered. That is, in such a mobile station apparatus, GERAN or UTRAN that can perform voice communication is selected, but since the LTE network is not selected, high-speed communication cannot be performed.
Further, an EMM (Evolved Packet System Management Management) cause value may be used as the service capability information. For example, the EMM cause value # 18 is a value indicating that the CS domain cannot be used. The 3GPP TS 24.301 receives this service capability information, and the mobile station apparatus operating in the CS / PS mode 1 does not access the registered LTE network (invalidation), and is GERAN or UTRAN. Is selected to use CSFB.

  Therefore, when the mobile station apparatus 11 receives “SMS Only”, “CS Fallback not preferred” or # 18 as the service capability information, the network selection unit 114 generates the next service display information. When the PLMN identifier indicates the LTE network, the network selection unit 114 generates, for example, service display information indicating “voice is disabled and high-speed data communication is possible”. When the PLMN identifier indicates GERAN or UTRAN, the network selection unit 114 generates, for example, service display information indicating “possible voice, low speed data communication is possible”. In the present embodiment, a service display storage unit (not shown) that stores service display information and service capability information in association with each other is provided, and the network selection unit 114 corresponds to the service capability information input from the service display storage unit. Service display information to be read may be read out.

(Appearance of mobile station equipment)
Next, the external appearance of the mobile station apparatus 11 according to this embodiment will be described.
FIG. 4 is a surface view showing an appearance of the mobile station apparatus 11 according to the present embodiment.
Most of the surface of the mobile station device 11 is covered with the touch panel 118. A reception status display 311 is shown at the upper left corner of the touch panel 118. The reception status display 311 is a diagram for displaying the antennas and the number of the antennas, and is indicated by the number of antennas corresponding to the electric field strength of the received signal (broadcast information, synchronization signal) received from the base station apparatus 22. In the example shown in FIG. 4, the electric field strength is stronger as the number of antennas is larger. However, the number of displayed antennas is a maximum of three and a minimum of zero.

(Example of screen display)
Next, an example of screen display displayed on the touch panel 118 will be described.
FIG. 5 is a schematic diagram illustrating an example of out-of-service display.
The out-of-range display 312 includes a rectangle with rounded vertices and an “out-of-range” kanji character surrounded by the rectangle. The out-of-service display 312 is displayed, for example, at a position where the reception status display 311 at the upper left end of the touch panel is displayed. Since the reception status display 311 and the out-of-service display 312 are not displayed at the same time, the user can visually grasp whether or not the service is out of service as part of the reception status.

FIG. 6 is a schematic diagram illustrating an example of a network display.
A network display 321 shown in (a) is an example of a network display indicating that the selected network cannot be used. When a network in which the operation mode is the voice priority mode and voice communication cannot be realized is selected, the network display 321 can be displayed to prompt the user to reselect the network.
A network display 322 shown in (b) is an example of a network display indicating that voice communication cannot be realized by the selected network. When the operation mode is the data priority mode and a network that cannot realize voice communication is selected, the network display 322 is displayed to alert the user whether or not the selected network can be used. Can do.

FIG. 7 is a schematic diagram illustrating an example of a network reselection display.
The network reselection display 323 includes a character string “Do you want to reselect the network operator (automatic)?” And two operation input buttons “Yes” and “No” indicating reselection of the network. When the touch panel 118 receives an operation input in the area where “Yes” is displayed, the touch panel 118 generates a network reselection signal and outputs the generated network reselection signal to the network selection unit 114. As a result, the network selection unit 114 reselects the PLMN identifier. When the touch panel 118 receives an operation input in an area where “No” is displayed, the touch panel 118 generates a network selection stop signal indicating that the network selection is not performed, and the generated network selection stop signal is transmitted to the network selection unit 114. Output. Thereby, in the network selection part 114, the process concerning selection of a PLMN identifier is complete | finished.

FIG. 8 is a schematic diagram illustrating an example of the selection mode display.
The selection mode display 324 is a display that prompts the user to select a selection mode. The timing when the selection mode display 324 is displayed is a time when the user selects to select a network, for example, a time when a PLMN list is displayed.
The character string “network selection mode” included in the selection mode display 324 is a character string indicating the selection mode. The character strings “auto”, “LTE priority”, “manual”, and “cancel” are respectively the automatic mode, the mode that preferentially selects the LTE network (LTE priority), the manual mode, and no selection. Is a character string indicating These four character strings are options required for the user to select.

  A rectangular frame indicates that an option is selected when an operation input is received in an area surrounded by the frame. The example shown in FIG. 8 indicates that “LTE priority”, that is, “LTE priority mode” is selected. The touch panel 118 generates selection mode information indicating a selection mode related to an option for which an operation input has been received, and outputs the generated selection mode information to the network selection unit 114. The network selection unit 114 stores selection mode information input from the touch panel 118 in the mode information storage unit. However, when the touch panel 118 receives an operation input in the area where “cancel” is displayed, the touch panel 118 generates a network selection stop signal indicating that the network selection is not performed, and the generated network selection stop signal is used as the network selection unit. To 114. Thereby, in the network selection part 114, the process which concerns on selection of a PLMN identifier is complete | finished. In the present embodiment, the selection mode display 324 may be displayed independently of the process related to the selection of the PLMN identifier, and the operation mode may be selected.

FIG. 9 is a schematic diagram illustrating an example of a PLMN list.
The PLMN list 325 is a character string “Please select a communication carrier” prompting the user to select a PLMN, a character string indicating three PLMNs (PLMN1-PLMN3) as options, and a character “Cancel”. Includes a string and a "more details" string. The example shown in FIG. 9 indicates that PLMN2 is selected. The touch panel 118 outputs a PLMN identifier indicating “PLMN2” to the network selection unit 114. Thereby, “PLMN2” is manually selected. The processing related to the button on which the character string “Cancel” is displayed is the same as in FIG. Detailed information request information indicating that when the touch panel 118 accepts an operation input in an area in which the character string “More details” is displayed, detailed information related to the PLMN displayed in the PLMN list 325 is requested. Is generated. The touch panel 118 outputs the generated detailed information request information to the network selection unit 114. When the detailed information request information is input from the touch panel 118, the network selection unit 114 outputs the detected PLMN identifier, cell ID, and band information to the location registration unit 115.

Accordingly, the location registration unit 115 performs a location registration request or location registration update for each PLMN identifier input from the network selection unit 114, and extracts the service capability information extracted from the location registration completion information or the location registration update completion information to the network. The data is output to the selection unit 114. The network selection unit 114 generates service display data related to a realizable service based on the service capability information input from the location registration unit 115 for each PLMN identifier. The network selection unit 114 outputs the generated service display data and the PLMN identifier in association with each other to the display unit 116.
When the touch panel 118 accepts an operation input in an area where the character string “More details” is displayed, the touch panel 118 deletes the character string and the button indicating the character string, and the other character strings are It will continue to be displayed.

FIG. 10 is a schematic diagram illustrating another example of the PLMN list.
In the PLMN list 326, “Select a carrier”, “PLMN 1”-“PLMN 3”, “Cancel” character strings and rectangular frames are the same as those shown in the PLMN list 325. Character strings displayed in association with the right side of the same line as “PLMN1”, “PLMN2”, and “PLMN3” are service displays of the respective PLMNs. The character string of “voice enabled” on the top line is a service display indicating that PLMN 1 is a PLMN capable of voice communication. The character string “high-speed data communication is possible” on the second line from the top is a service display indicating that PLMN 2 is a PLMN capable of high-speed data communication. The character string “Short Message Only” on the third line from the top is a service display indicating that PLMN 3 is a PLMN capable of only the short message service.

(Network selection process)
Next, network selection processing according to the present embodiment will be described. In the following description, it is assumed that the selection mode set in the mobile station apparatus 11 is the automatic mode, and the process is started when an LTE network that cannot realize voice communication is selected from the detected PLMN. In the present embodiment, the present invention is not limited to this, and another selection mode, for example, the manual mode may be set and may be started when the PLMN has not been detected yet.

FIG. 11 is a flowchart showing a part (1) of the network selection processing example according to the present embodiment.
(Step S201) The location registration unit 115 makes a location registration request for the selected LTE network. Thereafter, the process proceeds to step S202.
(Step S202) The location registration unit 115 receives location registration completion information from the selected LTE network. The received location registration completion information indicates that connection to the selected LTE network is permitted, and includes service capability information indicating that voice communication cannot be performed. Thereafter, the process proceeds to step S203.

(Step S203) The network selection unit 114 determines whether the operation mode information is a voice priority mode or a data priority mode. If the data priority mode is determined (step S203 data centric),
Proceed to step S204. If the voice priority mode is determined (step S203 voice centric), the process proceeds to step S205.
(Step S204) The network selection unit 114 completes the process related to the connection to the selected LTE. Here, the display unit 116 may perform network display indicating that voice communication is not possible. Thereafter, the process proceeds to step S207.
(Step S205) The network selection unit 114 disables the selected LTE network and does not use the selected LTE network for data transmission / reception. For example, the location registration unit 115 cancels location registration for the selected LTE network. Further, when the selected LTE network has a configuration that cooperates with other networks (for example, GERAN (GSM (registered trademark) and EDGE radio access network)), the LTE network is not released without performing location registration cancellation. Do not access. Thereafter, the process proceeds to step S206.
(Step S206) The network selection unit 114 transitions to another network. As described above, when the selected LTE network has a configuration that cooperates with another network, the mobile station apparatus 11 accesses the associated network without accessing the LTE network. Thereafter, the process proceeds to step S207.

(Step S207) The network detection unit 113 determines whether or not the selected PLMN cell exists. If it is determined that the user is present (YES in step S207), the process is terminated. If it is determined that the user is not located (NO in step S207), the process proceeds to step S208.
(Step S208) The touch panel 118 performs a selection mode display (see FIG. 8) as a part of the network selection screen display. Thereafter, the process proceeds to step S209.
(Step S209) The touch panel 118 accepts an operation input by the user, and “automatic mode”, “LTE priority mode”, “manual mode”, or “cancel” is selected as the selection mode (network selection mode). Determine if it was done. If “automatic mode” is selected (step S209 automatic), the process proceeds to step S211 (see FIG. 12). When “LTE priority mode” is selected (step S209, LTE priority), the process proceeds to step S221 (see FIG. 13). If “cancel” is selected (cancel step S209), the process is terminated. When “manual mode” is selected (manual in step S209), the process proceeds to step S241 (see FIG. 15).

FIG. 12 is a flowchart showing a part (2) of the network selection processing example according to the present embodiment.
FIG. 12 shows processing executed when the automatic mode is selected as the selection mode. In the process shown in FIG. 12, it is assumed that PLMN has been detected before starting.
(Step S211) The network selection unit 114 lowers the priority of the PLMN selected immediately before among the detected PLMNs to the lowest level, and raises the priority of other unselected PLMNs by one to increase the priority for each PLMN. Update priority. Thereafter, the process proceeds to step S212.
(Step S212) The network selection unit 114 selects the PLMN having the highest priority. The location registration unit 115 makes a location registration request for the newly selected PLMN so that it can be connected. Thereafter, the process ends.

FIG. 13 is a flowchart showing a part (3) of the network selection processing example according to the present embodiment.
FIG. 13 shows processing executed when the LTE priority mode is selected as the selection mode.
(Step S221) The network detection unit 113 detects a PLMN that can be accessed based on the broadcast information received from the base station apparatus included in each PLMN and the synchronization signal (PLMN search). Thereafter, the process proceeds to step S222.
(Step S222) The network selection unit 114 selects an LTE network from the detected PLMNs, and the location registration unit 115 makes a location registration request for each of the selected LTE networks. Thereafter, the process proceeds to step S223.

(Step S223) The network selection unit 114 extracts service capability information from the location registration completion information received from the selected LTE network, and determines whether there is an LTE network capable of voice communication based on the extracted service capability information. If it is determined that there is an LTE network capable of voice communication (YES in step S223), the process proceeds to step S224. If it is determined that there is no LTE network capable of voice communication (NO in step S223), the process ends.
(Step S224) When there are a plurality of LTE networks capable of voice communication, the network selection unit 114 selects the first discovered LTE network, that is, the LTE network with the highest priority. When there is one LTE network capable of voice communication, the network selection unit 114 selects the LTE network. Then, it progresses to step S231 (refer FIG. 14).

FIG. 14 is a flowchart showing a part (4) of the network selection processing example according to the present embodiment.
FIG. 14 shows a process to be executed when the location registration is completed for the already selected PLMN and the connection is possible.
(Step S231) The network detection unit 113 determines whether or not the mobile station apparatus 11 is out of service for the selected PLMN. If it is determined that the user is out of service area (YES in step S231), the process proceeds to step S232. If it is determined that it is not out of service area (NO in step S231), the process is terminated.
(Step S232) When the selection mode is “manual mode” or “LTE priority mode”, the network selection unit 114 sets the selection mode to “automatic mode”. Thereafter, the process ends.

FIG. 15 is a flowchart showing a part (5) of the network selection processing example according to the present embodiment.
FIG. 15 shows processing executed when the manual mode is selected as the selection mode.
(Step S241) The network detection unit 113 detects a PLMN that can be accessed based on broadcast information received from a base station apparatus included in each PLMN and a synchronization signal (PLMN search). Thereafter, the process proceeds to step S242.
(Step S242) The touch panel 118 displays a list of accessible PLMNs (PLMN list, see FIG. 9). Thereafter, the process proceeds to step S243.

(Step S243) The touch panel 118 receives an operation input by the user. If the “cancel” button is pressed in the PLMN list (step S243 cancel), the process ends. When one of the PLMNs displayed in the PLMN list is selected (selected from the list in step S243), the process proceeds to step S244. If the “more details” button is pressed in the PLMN list (further details in step S243), the process proceeds to step S245.

(Step S244) The network selection unit 114 transitions to the selected PLMN. Here, the location registration unit 115 makes a location registration request for the selected PLMN, and makes it possible to connect to the selected PLMN. Then, it progresses to step S231 (refer FIG. 14).
(Step S245) The location registration unit 115 makes a location registration request for each PLMN detected as an accessible PLMN. Thereafter, the process proceeds to step S246.
(Step S246) The location registration unit 115 receives location registration completion information from each PLMN that has requested location registration, and extracts service capability information from the received location registration completion information. The touch panel 118 displays service display information (detailed information) based on the service capability information extracted for each PLMN as a PLMN list (see FIG. 10) in association with the PLMN. Thereafter, the process proceeds to step S247.

(Step S247) The touch panel 118 receives an operation input by the user. If the “cancel” button is pressed in the PLMN list (step S247 cancel), the process is terminated. If one of the PLMNs displayed in the PLMN list is selected (selected from the list in step S247), the process proceeds to step S248.
(Step S248) The network selection unit 114 determines whether or not the selected PLMN is an LTE network. If it is determined that the network is an LTE network (YES in step S248), the process proceeds to step S249. If it is determined that the network is not an LTE network (NO in step S248), the process proceeds to step S252.

(Step S249) The network selection unit 114 determines whether or not the selected PLMN is a PLMN capable of voice communication. If it is determined that the PLMN is capable of voice communication (step S249 YES), the process proceeds to step S250. If it is determined that the PLMN cannot perform voice communication (NO in step S248), the process proceeds to step S251.
(Step S250) The network selection unit 114 sets the operation mode to “voice priority mode”. Thereafter, the process proceeds to step S252.
(Step S251) The network selection unit 114 sets the operation mode to “data priority mode”. Thereafter, the process proceeds to step S252.
(Step S252) The network selection unit 114 transitions to the selected PLMN. Here, the location registration unit 115 makes a location registration request for the selected PLMN, and makes it possible to connect to the selected PLMN. Then, it progresses to step S231 (refer FIG. 14).

As described above, the present embodiment detects one or a plurality of networks that transmit and receive radio signals, and at least one network among the detected one or a plurality of networks is based on a priority determined in advance for each network. If the selected network is a network that cannot provide a predetermined service, a network display that prompts the user to select one or a plurality of detected networks is displayed. indicate.
Accordingly, the user is prompted to select an unselected network, and a clue that the user can use the communication service desired by the user is obtained.

In addition, you may make it implement | achieve a part of mobile station apparatuses 11 in embodiment mentioned above, for example, the network detection part 113, the network selection part 114, and the location registration part 115 with a computer. In that case, the program for realizing the control function may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read by a computer system and executed. Here, the “computer system” is a computer system built in the mobile station apparatus 11 and includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” is a medium that dynamically holds a program for a short time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line, In such a case, a volatile memory inside a computer system serving as a server or a client may be included and a program that holds a program for a certain period of time. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.
Moreover, you may implement | achieve part or all of the mobile station apparatus 11 in embodiment mentioned above as integrated circuits, such as LSI (Large Scale Integration). Each functional block of the mobile station apparatus 11 may be individually made into a processor, or a part or all of them may be integrated into a processor. Further, the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. Further, in the case where an integrated circuit technology that replaces LSI appears due to progress in semiconductor technology, an integrated circuit based on the technology may be used.

  As described above, the embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to the above, and various design changes and the like can be made without departing from the scope of the present invention. It is possible to

1 ... communication system,
11 ... Mobile station device,
111 ... Antenna unit, 112 ... Transmission / reception unit, 113 ... Network detection unit,
114 ... Network selection unit, 115 ... Location registration unit, 116 ... Display unit,
117: Operation input unit, 118: Touch panel,
21 (21-1, 21-2) ... PLMN, 22 (22-1 and 22-2) ... base station apparatus,

Claims (11)

A network detector that detects one or more networks that transmit and receive wireless signals;
A network selection unit that selects at least one of the one or more networks detected by the network detection unit based on a priority set in advance for each network;
A location registration unit that requests location registration to the network selected by the network selection unit;
A display unit that displays a network display that prompts the user to select one or more networks detected by the network detection unit when the network selected by the network selection unit is a network that cannot provide a predetermined service; ,
A mobile station apparatus comprising: An operation input unit that receives an operation input instructing to select one or a plurality of networks detected by the network detection unit;
When the operation input unit does not accept the operation input even after a predetermined time has elapsed, the display unit displays a network display that prompts the operation input.
The mobile station apparatus according to claim 1. The network detection unit detects one or more networks again,
The mobile station apparatus according to claim 2, wherein the display unit displays a list of one or more networks detected again by the network detection unit. Receiving location registration completion information including service capability information indicating a service that can be provided by the network according to location registration to the network selected by the network selection unit;
The mobile station apparatus according to claim 3, wherein the display unit displays a service display based on the service capability information in association with the network.   5. The mobile station apparatus according to claim 3, wherein network detection performed by the network detection unit or position registration performed by the position registration unit is performed at predetermined time intervals.   The network selection unit is set with an operation mode for preferentially selecting a network that realizes a predetermined service, and an operation mode related to a service that can be realized by the network for which the operation input unit accepts an operation input. The mobile station apparatus according to claim 4.   The mobile station apparatus according to claim 6, wherein the network selection unit selects a network capable of realizing a service related to the operation mode based on the service capability information. The network detection unit determines whether or not it is out of a range where radio waves from the network selected by the network selection unit can be received;
The network selection unit selects one or more networks detected by the network detection unit at a predetermined time interval when it is determined that the network selection unit is out of the range. 4. The mobile station apparatus according to 4 or 6. A communication system comprising one or more networks for transmitting and receiving radio signals and a mobile station device,
The mobile station device
A network detector that detects one or more networks that transmit and receive wireless signals;
A network selection unit that selects at least one of the one or more networks detected by the network detection unit based on a priority set in advance for each network;
A location registration unit that requests location registration to the network selected by the network selection unit;
A display unit that displays a network display that prompts the user to select one or more networks detected by the network detection unit when the network selected by the network selection unit is a network that cannot provide a predetermined service; ,
A communication system comprising: A communication method in a mobile station device,
The mobile station apparatus detects a network detecting process for detecting one or a plurality of networks that transmit and receive radio signals;
A network selection process for selecting at least one network among the one or a plurality of networks detected in the network detection process based on a predetermined priority for each network;
A location registration process for requesting location registration in the network selected in the network selection process;
If the network selected in the network selection process is a network that cannot provide a predetermined service, a display that displays a network display prompting to select one or a plurality of networks detected in the network detection process Process,
A communication method characterized by comprising: In the computer of the mobile station device,
A network detection procedure for detecting one or more networks transmitting and receiving radio signals;
A network selection procedure for selecting at least one of the one or more networks detected in the network detection procedure based on a priority predetermined for each network;
A location registration procedure for requesting location registration in the network selected in the network selection procedure;
A display that displays a network display that prompts the user to select one or more of the networks detected in the network detection procedure when the network selected in the network selection procedure is a network that cannot provide a predetermined service. procedure,
A communication program characterized in that

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