JP2012114804A - Wireless terminal device and control method thereof - Google Patents

Abstract

A wireless terminal device capable of suppressing unnecessary location registration processing and a control method therefor are provided.
A cellular phone includes: an LTE receiving unit that receives identification data of a CDMA system call zone corresponding to a location registered LTE system call zone from a base station of the LTE system; CDMA receiver 42 that receives the identification data from the base station of the CDMA system, and identification data of the call zone of the transition destination received by the CDMA receiver 42 when transitioning from communication in the LTE system to communication in the CDMA system If the ID matches the identification data received by the LTE receiving unit 41, a new location registration is not performed, and if the ID does not match, the control unit 30 newly performs a location registration.
[Selection] Figure 2

Description

  The present invention relates to a wireless terminal apparatus that can communicate with a plurality of communication systems and a control method thereof.

  In recent years, as a communication system used by a wireless terminal device such as a mobile phone, an LTE (Long Term Evolution) communication system has appeared in addition to a circuit switched (CS) communication system (for example, CDMA). ing.

  However, the wireless terminal device cannot use both the LTE communication system and the CDMA communication system at the same time. Therefore, the wireless terminal device cannot acquire a CDMA paging channel while using LTE, and cannot know whether there is an incoming call. Therefore, in 3GPP TS 23.272, a CS Fallback function is defined, and by this function, an incoming request from CDMA can be notified by LTE (for example, refer to Patent Document 1 and Non-Patent Document 1).

  Here, in order to realize the CS Fallback function, it is necessary to know in which call zone a terminal that is waiting in LTE is physically located in CDMA. For this reason, when the wireless terminal device makes a location registration request in the LTE system, the LTE system makes a location registration request to a CDMA calling zone having an area overlapping with the LTE calling zone. At this time, it is obtained from mapping data prepared in advance which calling zone of LTE overlaps with the calling zone of LTE. When receiving the location registration request from the LTE system, the CDMA system updates the location registration information and returns a response to the LTE system.

JP 2009-267996 A

3GPP TS 23.272 V10.1.0, “Circuit Switched (CS) fallback in Evolved Packet System (EPS); Stage 2,” 2010-09

  However, in the above mapping data, since the LTE calling zone and the CDMA calling zone are associated with each other on a one-to-one basis, the physical positional relationship of the actual calling zone may deviate. In this case, when a hand-off from the LTE system to the CDMA system is performed, the location of the wireless terminal device equipped with the CS Fallback function is often registered in a call zone different from the handoff destination call zone.

  In this case, the wireless terminal device cannot receive a CDMA incoming signal at the handoff destination. Therefore, when the hand-off is performed, the wireless terminal device needs to newly register a location for the handoff destination call zone. Then, since the location registration may be performed again for the calling zone that has already been location registered, access to the CDMA system has increased.

  An object of this invention is to provide the radio | wireless terminal apparatus which can suppress an unnecessary location registration process, and its control method.

  The wireless terminal device according to the present invention also registers the location of the call zone in the first communication system with respect to the call zone of the second communication system corresponding to the call zone of the first communication system. A wireless terminal device whose location is registered, and receiving identification data of a paging zone of the second communication system corresponding to the paging zone of the first communication system that has been registered from the base station of the first communication system A first receiving unit that receives the identification data of the calling zone of the second communication system from a base station of the second communication system, and communication in the first communication system When transitioning from communication to communication in the second communication system, the identification data of the destination call zone received by the second reception unit is the same as the identification data received by the first reception unit. If you, without a location registration for the newly the transition destination of the call zone comprises Otherwise, a control unit for performing a new location registration to the call zone, the.

  Further, the first receiving unit acquires identification data of a calling zone of the second communication system from overhead information broadcast from a base station of the first communication system, and the second receiving unit It is preferable to obtain identification data of the calling zone of the second communication system from the overhead information broadcast from the base station of the second communication system.

  The first communication system is preferably an LTE system, and the second communication system is preferably a CDMA system.

  In addition, the first receiving unit is configured to call a second communication system call zone corresponding to the call zone of the first communication system based on the mapping data of the CS Fallback function defined in 3GPP TS 23.272. It is preferable to receive the identification data.

  When the position of the control method according to the present invention is registered with respect to the calling zone in the first communication system, the position is also determined with respect to the calling zone of the second communication system corresponding to the calling zone of the first communication system. A wireless terminal device control method to be registered, wherein identification data of a paging zone of a second communication system corresponding to a paging zone of the first communication system registered for location is used as a base station of the first communication system A first reception step of receiving from the base station of the second communication system, and a first reception step of receiving paging zone identification data of the second communication system; When a transition is made from communication in the second communication system to communication in the second communication system, the identification data of the destination call zone received in the second reception step is the first reception step. A control step for newly registering the location for the call zone if it does not match, and if it does not match the location data for the transition destination newly .

  According to the present invention, unnecessary location registration processing is suppressed in a wireless terminal device.

1 is an external perspective view of a mobile phone according to an embodiment of the present invention. It is a block diagram which shows the function of the mobile telephone which concerns on embodiment of this invention. It is a figure which shows the procedure of the cooperation position registration which concerns on embodiment of this invention. It is a figure which shows an example when the mobile telephone which concerns on embodiment of this invention hands off to the calling zone different from mapping data. It is a figure which shows an example when the mobile telephone which concerns on embodiment of this invention hands off to the ringing zone which corresponds to mapping data. It is a sequence diagram which shows a process in case the mobile telephone which concerns on embodiment of this invention hands off to the calling zone which corresponds to mapping data. It is a sequence diagram which shows a process in case the mobile telephone which concerns on embodiment of this invention hands off to the calling zone which does not correspond to mapping data.

  Hereinafter, an example of a preferred embodiment of the present invention will be described. In the present embodiment, a mobile phone 1 will be described as an example of a wireless terminal device.

FIG. 1 is an external perspective view of a mobile phone 1 according to the present embodiment.
FIG. 1 shows a so-called foldable mobile phone, but the mobile phone according to the present invention is not limited to this. For example, a sliding type in which one casing is slid in one direction from a state in which both casings are overlapped, or a rotary type in which one casing is rotated around an axis along the overlapping direction ( Turn type), or a type (straight type) in which the operation unit and the display unit are arranged in one housing and does not have a connecting unit.

  The mobile phone 1 includes an operation unit side body 2 and a display unit side body 3. The operation unit side body 2 includes an operation unit 11 on the front surface unit 10 and a microphone 12 to which a voice uttered by a user of the mobile phone 1 during a call or when using a voice recognition application is input. The The operation unit 11 includes a function setting operation button 13 for activating various functions such as various setting functions, a telephone book function, and a mail function, and an input operation button 14 for inputting numbers of telephone numbers, mail characters, and the like. , And a determination operation button 15 for performing determination and scrolling in various operations.

  The display unit side body 3 includes a display unit 21 for displaying various types of information on the surface unit 20 and a receiver 22 for outputting the voice of the other party of the call.

  Further, the upper end portion of the operation unit side body 2 and the lower end portion of the display unit side body 3 are connected via a hinge mechanism 4. In addition, the mobile phone 1 relatively rotates the operation unit side body 2 and the display unit side body 3 which are connected via the hinge mechanism 4, so that the operation unit side body 2 and the display unit side body 3 are rotated. The body 3 can be in an open state (open state), or the operation unit side body 2 and the display unit side body 3 can be folded (closed state).

FIG. 2 is a block diagram showing functions of the mobile phone 1 according to the present embodiment.
The mobile phone 1 includes an operation unit 11, a display unit 21, a control unit 30, a communication unit 40, a storage unit 50, and a voice control unit 60.

  The control unit 30 controls the entire mobile phone 1, and performs predetermined control on each unit such as the display unit 21 and the communication unit 40, for example. In addition, the control unit 30 receives input from the operation unit 11, the communication unit 40, and the like, and executes various processes. And the control part 30 controls the memory | storage part 50 in the case of a process execution, reads various programs and data, and writes data. Detailed functions of the control unit 30 according to the present embodiment will be described later.

  The communication unit 40 communicates with an external device (base station) in a predetermined use frequency band (for example, 2 GHz band, 800 MHz band, etc.). Then, the communication unit 40 demodulates the signal received from the antenna, supplies the processed signal to the control unit 30, modulates the signal supplied from the control unit 30, and transmits the signal from the antenna to the external device. To do.

  Here, in this embodiment, the communication unit 40 is a communication protocol mainly used for high-speed data communication and W-CDMA and CDMA2000_1x (hereinafter referred to as CDMA) systems that are communication protocols for voice and data communication. Both the LTE system and the communication system of any protocol can be communicated. The communication unit 40 communicates with the base station using any protocol based on a command from the control unit 30. The mobile phone 1 prioritizes communication in the LTE system (first communication system) using the LTE method during data communication, and switches to communication using the CDMA system (second communication system) using the CDMA method during voice communication. Shall.

  The communication unit 40 includes an LTE receiving unit 41 (first receiving unit) and a CDMA receiving unit 42 (second receiving unit).

  The LTE receiving unit 41 receives, from the base station 100 of the LTE system, identification data of the CDMA system calling zone corresponding to the registered LTE system calling zone. The identification data is acquired based on the mapping data of the CS Fallback function in the LTE system, and is included in the overhead information broadcast from the base station 100. The LTE receiving unit 41 acquires identification data from this overhead information.

  When capturing and handing off the CDMA system, the CDMA receiving unit 42 receives identification data of the handoff destination call zone from the base station 200 of the CDMA system. The identification data is included in the overhead information broadcast from the base station 200, and the CDMA receiver 42 acquires the identification data from this overhead information.

  The storage unit 50 includes, for example, a working memory and is used for arithmetic processing by the control unit 30. In addition, various programs according to the present embodiment are stored. Furthermore, the storage unit 50 stores a zone list including data for identifying a calling zone where the location of the mobile phone 1 is registered in the CDMA system.

  The sound control unit 60 performs predetermined sound processing on the signal supplied from the communication unit 40 under the control of the control unit 30, and outputs the processed signal to the receiver 22. The receiver 22 outputs the signal supplied from the audio control unit 60 to the outside. This signal may be output from a speaker (not shown) instead of the receiver 22 or together with the receiver 22. In addition, the voice control unit 60 processes the signal input from the microphone 12 according to the control of the control unit 30, and outputs the processed signal to the communication unit 40. The communication unit 40 performs a predetermined process on the signal supplied from the audio control unit 60 and outputs the processed signal from the antenna.

Next, the function of the control unit 30 will be described in detail.
The mobile phone 1 and the control device of each communication system have a CS Fallback function in order to notify the incoming of the CDMA system in the LTE system. Therefore, an MME (Mobility Management Entity), which is a control device of the LTE system, stores mapping data indicating a correspondence relationship between physical call zone overlaps of the LTE system and the CDMA system.

  Further, when the mobile phone 1 is registered for the calling zone in the LTE system, the mobile phone 1 is also registered by the MME (coordinated location registration) for the calling zone of the CDMA system corresponding to the calling zone of the LTE system. The

FIG. 3 is a diagram illustrating a procedure of cooperative position registration according to the present embodiment.
The MME, which is a control device of the LTE system, manages three call zones (TA1, TA2, TA3). Moreover, MSC (Mobile Switching Center) / VLR (Visit Location Register) # 1 and MSC / VLR # 2 which are control devices of the CDMA system manage the calling zones LA1 and LA2, respectively.

  Then, the MME stores the correspondence relationship between TA1 and LA1 and the correspondence relationship between TA2 and TA3 and LA2 as mapping data in the mapping table.

  First, the control unit 30 of the mobile phone 1 located in the calling zone TA3 of the LTE system performs location registration processing for the MME (1). Then, the MME determines the calling zone LA2 of the CDMA system physically overlapping with the calling zone TA3 from the mapping table (2). Then, the MME makes a location registration request to the MSC / VLR # 2 that manages the calling zone LA2 (3). The MSC / VLR # 2 that has received this request performs location registration processing and stores that the mobile phone 1 is located in the calling zone TA3 of the LTE system.

  As a result of this coordinated location registration, an incoming call in the CDMA system is notified to the MSC / VLR # 2, and an incoming call notification is sent from the MSC / VLR # 2 to the MME.

  The control unit 30 of the mobile phone 1 performs response processing by handing off from the LTE system to the CDMA system in response to the incoming call notification. In addition to this, the CDMA system while the mobile phone 1 is idle due to a decrease in signal strength or the like. May hand off to

  In this case, the control unit 30 captures the CDMA system and synchronizes with a base station having a good communication environment, and thus does not always handoff to a paging zone that matches the mapping data. Therefore, when the control unit 30 makes a transition from communication in the LTE system to communication in the CDMA system, the identification data of the destination call zone received by the CDMA reception unit 42 is received by the LTE reception unit 41. If it does not match, the location registration is not newly performed for the call zone of the transition destination, and if it does not match, the location registration is newly performed for the call zone of the transition destination.

  In this way, the control unit 30 newly executes the location registration process only when the handoff destination call zone is different from the call zone that has already been registered by the above-described coordinated location registration, and for the same call zone, Therefore, it is possible to prevent the location registration process from being executed repeatedly.

  FIG. 4 is a diagram illustrating an example when the mobile phone 1 according to the present embodiment hands off to a calling zone different from the mapping data.

  In this example, the location of the mobile phone 1 is registered in the call zone TA2 of the LTE system, and the location of registration is also registered in the call zone LA1 of the corresponding CDMA system according to the mapping table.

  At this time, if the mobile phone 1 is physically located at a place overlapping the call zone LA2, when handoff to the CDMA system is performed, the mobile phone 1 is synchronized with the call zone LA2. Then, since the incoming signal is transmitted to the MSC / VLR # 1 of the calling zone LA1 whose location is registered, the cellular phone 1 cannot receive this incoming signal.

  Therefore, when handoff is performed from the calling zone TA2 of the LTE system to the calling zone LA2 of the CDMA system, the control unit 30 of the mobile phone 1 newly performs a location registration process for the calling zone LA2.

  FIG. 5 is a diagram illustrating an example when the mobile phone 1 according to the present embodiment is handed off to the calling zone that matches the mapping data.

  In this example, the location of the mobile phone 1 is registered in the call zone TA2 of the LTE system, and the location of registration is also registered in the call zone LA1 of the corresponding CDMA system according to the mapping table.

  At this time, if the mobile phone 1 is physically located at a location overlapping with the calling zone LA1, when handing off to the CDMA system, the mobile phone 1 is synchronized with the calling zone LA1 that has already been registered in the cooperative position. Therefore, the mobile phone 1 can receive the incoming signal transmitted to the MSC / VLR # 1 without newly registering the location.

  FIG. 6 is a sequence diagram showing a process when the mobile phone 1 according to the present embodiment hands off to the calling zone that matches the mapping data.

In step S1, the mobile phone 1 is located in the calling zone TA2 of the LTE system, and the control unit 30 synchronizes with the base station of the LTE system.
At this time, the storage unit 50 of the mobile phone 1 stores a zone list for identifying the calling zone of the CDMA system whose location has been registered in the past. The zone list includes a registered zone number (REG_ZONE), a system number (SID), and a network number (NID) as calling zone identification data.

  The MME of the LTE system stores a mapping table. The mapping table includes identification data (REG_ZONE, SID, and NID) of the calling zone of the CDMA system corresponding to the calling zone of the LTE system.

  In step S2, the MME acquires identification data of the calling zone LA1 of the CDMA system corresponding to the calling zone TA2 of the LTE system from the mapping table. Then, the MME transmits the acquired identification data (REG_ZONE = 1, SID = 13044, NID = 4) to the mobile phone 1 including the overhead information.

  In step S3, the control unit 30 of the mobile phone 1 issues a location registration request to the calling zone TA2 of the LTE system to the MME.

  In step S4, the MME makes a location registration request for the paging zone LA1 of the CDMA system to the MSC / VLR # 1 associated with the paging zone TA2 in the mapping table.

  In step S5, the MSC / VLR # 1 transmits a location registration response to the MME and notifies the completion of location registration.

  In step S6, the MME transmits a location registration response to the mobile phone 1 to notify the completion of location registration.

  In step S <b> 7, the control unit 30 of the mobile phone 1 updates the zone list stored in the storage unit 50 in response to the completion of the location registration in the CDMA system. When the zone list holds the history of identification data, the identification data of the calling zone LA1, which is the location registration destination, is inserted into the latest record (for example, the first line), and the original data is shifted.

  In step S8, the mobile phone 1 is synchronized with the base station of the LTE system, but is subsequently out of the LTE system, and the control unit 30 searches for the CDMA system, and as a result, synchronizes with the base station of the paging zone LA1 of the CDMA system. To do.

  In step S9, the MSC / VLR # 1 includes the identification data (REG_ZONE = 1, SID = 13044, NID = 4) of the paging zone LA1 of the CDMA system managed by itself in the overhead information to the mobile phone 1. Send.

  In step S <b> 10, the control unit 30 of the mobile phone 1 determines whether or not the identification data received in step S <b> 9 matches the latest record in the zone list in the storage unit 50. In this sequence, since the identification data match, the determination is YES, and the control unit 30 ends the process without making a location registration request accompanying handoff.

  FIG. 7 is a sequence diagram showing processing when the mobile phone 1 according to the present embodiment hands off to a calling zone that does not match the mapping data.

  Steps S1 to S7 are the same as those in FIG. 6, and the identification data of the calling zone LA1 of the CDMA system is stored in the latest record of the zone list in accordance with the cooperation position registration.

  In step S8a, the mobile phone 1 is synchronized with the base station of the LTE system, but is subsequently out of the LTE system, and the control unit 30 searches for the CDMA system, and as a result, synchronizes with the base station of the calling zone LA2 of the CDMA system. To do.

  In step S9a, the MSC / VLR # 2 includes the identification data (REG_ZONE = 2, SID = 13044, NID = 4) of the paging zone LA2 of the CDMA system managed by the MSC / VLR # 2 in the overhead information to the mobile phone 1. Send.

  In step S <b> 10, the control unit 30 of the mobile phone 1 determines whether or not the identification data received in step S <b> 9 a matches the latest record in the zone list in the storage unit 50. In this sequence, since the identification data do not match, the determination is no, and the control unit 30 moves the process to step S11.

  In step S11, the control unit 30 of the mobile phone 1 makes a location registration request to the calling zone LA2 of the CDMA system to the MSC / VLR # 2.

  In step S12, the MSC / VLR # 2 transmits a location registration response to the mobile phone 1 to notify the completion of location registration.

  In step S <b> 13, the control unit 30 of the mobile phone 1 updates the zone list stored in the storage unit 50 in the same manner as in step S <b> 7 in response to the completion of location registration in the CDMA system.

  As described above, according to the present embodiment, when the mobile phone 1 is handed off from the LTE system to the CDMA system, if the call zone has already been registered in the linked position, the mobile phone 1 does not perform new position registration and does not perform a different call. If it is a zone, new location registration is performed. Therefore, the mobile phone 1 can suppress unnecessary location registration processing and reduce power consumption.

  At this time, the mobile phone 1 is notified of the calling zone of the CDMA system registered in the cooperation location by the overhead information from the LTE system, and is notified of the calling zone of the handoff destination by the overhead information from the CDMA system. Since the mobile phone 1 determines whether or not a new location registration process is necessary by comparing these calling zones, an increase in the amount of communication data and the processing load is suppressed, and the determination can be made easily.

  As mentioned above, although embodiment of this invention was described, this invention is not restricted to embodiment mentioned above. The effects described in the embodiments of the present invention are only the most preferable effects resulting from the present invention, and the effects of the present invention are limited to those described in the embodiments of the present invention. is not.

  The W-CDMA scheme, the CDMA2000_1x scheme, and the LTE scheme in the above-described embodiment are merely examples, and other communication protocols may be used. The same applies to, for example, the GSM method and a method specialized for data communication as long as there is cooperation between zones at the time of location registration.

  Further, the wireless terminal device according to the present invention is not limited to the mobile phone 1. The present invention can be applied to various devices such as a PHS (registered trademark), a personal digital assistant (PDA), a game machine, a navigation device, a personal computer, and a communication dedicated module specialized for a communication function. .

1 Mobile phone (wireless terminal device)
DESCRIPTION OF SYMBOLS 11 Operation part 21 Display part 30 Control part 40 Communication part 41 LTE receiving part (1st receiving part)
42 CDMA receiver (second receiver)
50 storage unit 60 voice control unit 100 base station 200 base station

Claims (5)

When a location is registered for a paging zone in the first communication system, the radio terminal device is also registered for a paging zone of the second communication system corresponding to the paging zone of the first communication system. And
A first receiving unit that receives, from a base station of the first communication system, identification data of a call zone of the second communication system corresponding to the call zone of the first communication system that has been registered;
A second receiving unit for receiving identification data of a calling zone of the second communication system from a base station of the second communication system;
When transitioning from communication in the first communication system to communication in the second communication system, identification data of the destination call zone received by the second reception unit is received by the first reception unit. A radio that includes a control unit that newly does not perform location registration with respect to the transition destination call zone when the received identification data matches, and newly performs location registration with respect to the call zone when there is no match Terminal device. The first receiving unit acquires identification data of a calling zone of the second communication system from overhead information broadcast from a base station of the first communication system,
The radio terminal apparatus according to claim 1, wherein the second receiving unit acquires identification data of a calling zone of the second communication system from overhead information broadcast from a base station of the second communication system.   The radio terminal apparatus according to claim 1, wherein the first communication system is an LTE system, and the second communication system is a CDMA system.   The first receiving unit identifies a paging zone of the second communication system corresponding to the paging zone of the first communication system based on mapping data of the CS Fallback function defined in 3GPP TS 23.272 The wireless terminal device according to claim 3, which receives data. Control of a radio terminal apparatus in which location registration is also performed for the call zone of the second communication system corresponding to the call zone of the first communication system when location registration is performed for the call zone of the first communication system A method,
A first receiving step of receiving, from a base station of the first communication system, identification data of a call zone of the second communication system corresponding to the call zone of the first communication system registered for location;
A second receiving step of receiving identification data of a calling zone of the second communication system from a base station of the second communication system;
When transitioning from communication in the first communication system to communication in the second communication system, identification data of the call zone of the transition destination received in the second reception step is obtained in the first reception step. A control step that does not newly register a location for the call zone of the transition destination when the received identification data matches, and newly performs a location registration for the call zone when they do not match Method.

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