JP2010068250A - Mobile radio terminal and communication processing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To adequately perform processing for origination to and termination from an access network of a CS system by suitably reselecting a cell of an access network, other than E-UTRAN when a base station belonging to the E-UTRAN is at a standby. <P>SOLUTION: In a mobile radio terminal, a radio transmission and reception unit performs transmission to and reception from a base station belonging to a circuit switched network using radio signals, and transmission to and reception from a base station, belonging to a mobile communication network connected to the circuit switched network and forming one integrated communication network with the circuit switched network, using radio signals, and a control unit sets a parameter group used to reselect a base station belonging to the circuit switched network or a cell of the base station, when an origination/termination request associated with the circuit switched network is formed, while a base station belonging to the mobile communication network is on standby, take measurements associated with the circuit switched network using the parameter group, and reselects the base station belonging to the circuit switched network through the radio transmission and reception unit, when a reselection standard associated with the circuit switched network is satisfied. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a mobile radio terminal and a communication processing method, and in particular, when an E-UTRAN (Evolved Universal Trrestrial Radio Access Network) is waiting, an event of a CS (circuit-switched) service is transmitted via the E-UTRAN. The present invention relates to a mobile radio terminal and a communication processing method that can be connected to a CS access network when received.

  3GPP TS23.272 V8.0.0 (hereinafter referred to as “TS23.272”) defined by 3GPP, the standardization organization for the 3rd generation mobile phone standards, uses E-UTRAN (Evolved Universal Terrestrial Radio Access Network) A mobile communication network having a switching network (CS network) (for example, UTRAN (Universal Terrestrial Radio Access Network), GERAN (GSM / EDGE Radio Access Network), cdma2000 1x RTT (1x Radio Transmission Technology) CS access network (hereinafter referred to as “1x In the Evolved Packet System (EPS) integrated with the CS access network)), etc., when the mobile radio terminal (UE: User Equipment) is waiting for E-UTRAN to perform CS service (CS Fallback) method is defined.

  FIG. 1 shows an outline of EPS having a CS Fallback function. As shown in FIG. 1, EPS has E-UTRAN, UTRAN and GERAN as access networks for providing CS service, and these are MSC (Mobile-services) in CN (Core Network) via each interface. Switching Center) Server is connected. Of course, EPS has E-UTRAN and UTRAN and GERAN as access networks providing CS services, but may have 1x CS access network.

  In EPS with CS Fallback function, the mobile radio terminal normally waits in E-UTRAN. When the mobile radio terminal receives a CS service event such as a CS incoming notification from the EPS side or a service request in the mobile radio terminal (CS transmission, CS incoming, CS SMS (Short Message Service), etc.) In order to implement the CS service, it connects to UTRAN, GERAN, or 1x CS access networks, and transmits / receives information to / from these networks. Sections 6.4 and 7.2 describe the process in which a mobile radio terminal waiting at an E-UTRAN base station sends and receives calls to UTRAN or GERAN that provides CS services. Connection to the 1x CS access network is described in Annex B2.2 and B2.3.

  FIG. 2 shows a processing sequence between each component of the mobile radio terminal and the EPS when transmitting to the 1x CS access network when the mobile radio terminal is waiting in E-UTRAN. As shown in FIG. 2, a mobile radio terminal (UE) stands by in E-UTRAN and is registered in 1x RTT (Radio Transmission Technology) MSC (Mobile Switching Center). Then, when waiting for E-UTRAN, when transmitting to the 1x CS access network, the mobile radio terminal performs cell reselection of 1xRTT, and between the mobile radio terminal and the 1x CS access network according to the 3GPP2 standard. 1x CS MO (Mobile Originated) call is established. FIG. 3 shows a processing sequence between the mobile radio terminal and each EPS component when processing an incoming call from the 1x CS access network when the mobile radio terminal is waiting in E-UTRAN. As shown in FIG. 3, the mobile radio terminal (UE) is waiting in E-UTRAN and registered in 1x RTT MCS. When a mobile radio terminal is waiting in E-UTRAN and receives an incoming call from the 1x CS access network, the 1xRTT MCS first receives a Paging Request from the 1x CS IWS, and uses the direct transfer of the S102 interface. , 1x RTT CS Paging is transmitted to MME. When the mobile radio terminal is in E-UTRAN idle state and cannot receive the 1x RTT CS Paging message to be transmitted next, the MME sends a Network-initiated services request to the mobile radio terminal via E-UTRAN. To establish a connection between the mobile radio terminal and the MME so that 1x RTT CS Paging can be received. Then, the MME transmits 1x RTT CS Paging to E-UTRAN using the S1 cdma2000 Tunneling function, and E-UTRAN transmits the 1x RTT CS Paging message to the mobile radio terminal using UL / DL information transfer.

  The mobile radio terminal performs cell reselection of 1xRTT, transmits a 1x RTT CS Page Response Message to a 1xRTT base station not described here, and transmits it to the 1x CS IWS via this 1xRTT base station. 1x CS IWS sends Paging Response to 1x RTT MSC. Thereby, a 1x MT call is established between the mobile radio terminal and the 1x CS access network according to the 3GPP2 standard. Thus, according to TS23.272, as long as the mobile radio terminal waits in E-UTRAN, the CS Fallback function can be used to directly connect the E-UTRAN itself without waiting for the CS access network. CS services that are not provided can be used.

In 3GPP TS36.304 V8.2.0 (hereinafter referred to as “TS36.304”), a process performed by a mobile radio terminal when the mobile radio terminal (UE) is waiting in E-UTRA is defined. In particular, in §5.2.4, there is a measurement method for performing cell reselection to another access network (for example, UTRAN, GERAN, 1x CS access network, etc.) when the mobile radio terminal is located in E-UTRA. The selection criteria are described. The mobile radio terminal can perform cell selection to another access network in accordance with these regulations.
3GPP TS23.272 V8.0.0 3GPP TS36.304 V8.2.0

  According to TS23.272 described above, when a mobile radio terminal is waiting for E-UTRA and performs call processing and incoming call processing to the 1x CS access network, the mobile radio terminal performs cell reselection according to regulations. Then, after the connection destination cell to which the mobile radio terminal is connected transitions from the E-UTRA cell to the 1x CS access network cell, transmission and reception to the 1x CS access network are performed. However, according to TS23.272 described above, a specific method for cell reselection to the 1x CS access network is not defined. Furthermore, although TS36.304 described above prescribes cell reselection in E-UTRAN, the processing of TS23.272 is not considered. Therefore, there was a problem that the processing specified in TS23.272 was not implemented as intended.

  This will be specifically described below. According to TS36.304 §5.2.4, when a mobile radio terminal waiting in E-UTRAN performs cell reselection to a cell in an access network other than E-UTRAN such as a 1x CS access network, The mobile radio terminal needs to perform measurement on a cell in an access network other than E-UTRAN, and then determine whether the measurement result satisfies the standard.

  At this time, in order to start measurement related to a cell in an access network other than E-UTRAN, it is necessary to satisfy a cell measurement start condition. Cell measurement start conditions are as follows.

(Cell measurement start condition 1):
(S value of E-UTRAN cell currently waiting) <(S _intrasrch )
And (Reselection Priority of access network other than E-UTRAN subject to cell reselection)> (Reselection Priority of E-UTRAN currently waiting)
Be.

(Cell measurement start condition 2):
(S value of E-UTRAN cell currently waiting) <(S _intrasrch )
And (Reselection Priority of access network other than E-UTRAN subject to cell reselection) ≤ (Reselection Priority of E-UTRAN currently waiting)
And (S value of the current standby E-UTRAN) <(S _nonintrasrch )
Be.

Note that “S value of E-UTRAN cell” means a signal value calculated based on the received signal strength from the E-UTRAN cell, and “S _intrasrch ” means a cell belonging to the same frequency of E-UTRAN. Means the threshold value used for the search start determination. “Reselection Priority” means a selection priority value used for reselection processing of base stations belonging to each access network, and “S _nonintrasrch ” starts a search for cells other than those belonging to the same frequency of E-UTRAN. It means the threshold value used for judgment.

  When any one of these cell measurement start conditions (cell measurement start condition 1 and cell measurement start condition 2) is satisfied, measurement related to a cell in an access network other than E-UTRAN is started. However, in order for the mobile radio terminal to perform cell reselection, the measurement result regarding the cell must satisfy the following (cell reselection criterion 1) or (cell reselection criterion 2) according to the cell measurement start condition. is necessary.

(Cell reselection criteria 1):
When cell measurement start condition 1 (Reselection Priority of access network other than E-UTRAN subject to cell reselection)> (Reselection Priority of E-UTRAN currently waiting) satisfies (Other than E-UTRAN subject to cell reselection) The S value of the cell in the access network)> (Thresh _{x, high} ) must continue for at least the period of Treselection _RAT .

(Cell reselection criteria 2):
When cell measurement start condition 2 (Reselection Priority of an access network other than E-UTRAN subject to cell reselection) ≤ (Reselection Priority of currently waiting E-UTRAN) (S of the cell of currently waiting E-UTRAN) Value) <(Thresh _{serving, low} )
And (the S value of the cell of the access network other than the E-UTRAN subject to cell reselection)> (Thresh _{x, low} ) state should continue for at least Treselection _RAT .

Note that “Thresh _{x, high} ” is a value other than E-UTRAN when the selection priority value of the access network other than E-UTRAN for cell reselection is higher than the selection priority of the currently waiting E-UTRAN. Means a threshold value used for reselection determination of cells belonging to a specific frequency x of the access network, and “between reselection _RAT ” means an observation period of cells of the access network other than E-UTRAN. Treselection _RAT is defined for each access network (for example, in the case of 1xRTT network, it is expressed as Treselection _{CDMA_1xRTT} ). Also, "Thresh _{serving, low} " is the lower limit of the selection of E-UTRAN cells that are currently waiting. "Thresh _{x, low} " means that the selection priority value of the access network other than the E-UTRAN subject to cell reselection is less than or equal to the selection priority of the currently waiting E-UTRAN. This means a threshold value used for reselection determination of cells belonging to a specific frequency x of an access network other than E-UTRAN.

  Here, with reference to the flowchart of FIG. 4, the cell reselection operation during standby for E-UTRAN performed in the mobile radio terminal based on the cell measurement start condition and the cell reselection criterion will be described. Note that a cell in an access network using, for example, UTRAN, GERAN, or 1x CS access network can be a cell reselection target. For example, a case where the 1x CS access network method is adopted will be described.

In step S1, the mobile radio terminal performs intermittent wake-up for E-UTRAN incoming monitoring, and controls the radio transmission / reception unit 32 to perform E-UTRAN intermittent reception. In step S2, the mobile radio terminal determines whether or not a cell measurement start condition related to the 1x CS access network (cell measurement start conditions 1 and 2 described above) is satisfied. If it is determined in step S2 that the mobile radio terminal satisfies the cell measurement start condition for the 1x CS access network, the mobile radio terminal activates a reception circuit for the 1x CS access network and synchronizes with the 1x CS access network in step S3. Then, in step S4, measurement is performed on the cell of the 1x CS access network. In step S5, the mobile radio terminal determines whether or not a cell reselection criterion (cell reselection criteria 1 and 2 described above) regarding the 1x CS access network is satisfied. If it is determined in step S5 that the mobile radio terminal satisfies the cell reselection criteria for the 1x CS access network, the mobile radio terminal reselects the cell of the 1x CS access network in step S6. On the other hand, if it is determined in step S5 that none of the cell reselection criteria for the 1x CS access network is satisfied, the mobile radio terminal does not reselect the cell of the 1x CS access network in step S7, and in step S8, E- Sets the E-UTRAN intermittent reception timer using the intermittent reception cycle (DRX _E-UTRAN ) specified by UTRAN. In step S9, the mobile radio terminal starts the count operation of the set E-UTRAN intermittent reception timer, and in step S10, the mobile radio terminal controls the radio transmission / reception unit and stops the circuit for E-UTRAN. And sleep.

However, when performing the cell reselection to the 1x CS access network when executing the CS Fallback function according to TS23.272 while waiting in E-UTRAN by the E-UTRAN intermittent reception operation described with reference to FIG. At least the following problems occur. First, when the measurement start condition 1 or the measurement start condition 2 is not satisfied, measurement for cell reselection is not started in the mobile radio terminal, and as a result cell reselection cannot be performed. Second, in reselection criterion 1 or reselection criterion 2, since the predetermined state in each criterion needs to continue for the time specified by Treselection _RAT (Treselection _{CDMA_1xRTT} ), The cell reselection is delayed, and as a result, the outgoing / incoming processing for the 1x CS access network specified in TS23.272 is delayed. Third, cell reselection to the 1x CS access network is performed unless the S value of the cell of the access network other than E-UTRAN is Thresh _{x, high} or Thresh _{x, low} depending on the measurement start condition. Not implemented. For this reason, even though the communication level is on the 1x CS access network side, cell reselection is restricted by these threshold values, and as a result, communication cannot be started on the 1x CS access network side. Then, due to these problems, the processing specified in TS23.272 falls into a state where it cannot be performed in the worst case.

  The present invention has been made in view of such a situation. When waiting in E-UTRAN, the present invention suitably performs cell reselection of an access network other than E-UTRAN, and issues it to the CS access network. It is an object of the present invention to provide a mobile radio terminal and a communication processing method that can appropriately perform incoming call processing.

  In order to solve the above-described problem, a mobile radio terminal according to the present invention includes a circuit-switched network transmission / reception unit that transmits and receives radio signals to and from a base station that belongs to a circuit-switched network, and is connected to the circuit-switched network together with the circuit-switched network. Mobile communication network transmission / reception means for transmitting / receiving using radio signals to / from a base station belonging to a mobile communication network forming one integrated communication network, and outgoing / incoming calls related to a circuit switching network while waiting at a base station belonging to the mobile communication network When requested, the parameter group used when reselecting a base station belonging to the circuit switched network or reselecting a cell within the reach of the radio wave radiated from the base station belonging to the circuit switched network The setting means for setting one parameter group and the parameter group set by the setting means are used to activate the circuit-switched network transmitting / receiving means and belong to the circuit-switched network via the circuit-switched network transmitting / receiving means. If the cell reselection criteria for the circuit switched network are satisfied, the base station or cell belonging to the circuit switched network is transmitted via the circuit switched network transmitting / receiving means. And control means for controlling to reselect.

  In order to solve the above-described problems, the communication processing method of the present invention transmits / receives to / from a base station belonging to a circuit switching network using a radio signal, is connected to the circuit switching network, and has one integrated communication network together with the circuit switching network. When a base station belonging to the mobile communication network is transmitted / received using a radio signal, and a base station belonging to the mobile communication network is waiting on the base station belonging to the mobile communication network, a base station belonging to the circuit switching network is requested. If a parameter group used when reselecting is set, a measurement related to the circuit switched network is performed using the set parameter group, and a reselection criterion related to the circuit switched network is satisfied, a base station belonging to the circuit switched network It controls to re-select.

  In order to solve the above-described problem, a mobile radio terminal according to the present invention uses a radio signal and a base station belonging to a circuit switching network including at least one of UTRAN, GERAN, and cdma2000 1x CS access network. A circuit-switched network transmitting / receiving means for transmitting and receiving; a mobile communication network transmitting / receiving means for transmitting / receiving using a radio signal with a base station belonging to E-UTRAN, which is connected to the circuit-switched network and forms one integrated communication network together with the circuit-switched network; A setting means for setting a parameter group used when reselecting a base station belonging to the circuit switching network when there is a call origination / reception request regarding the circuit switching network while waiting at the base station belonging to E-UTRAN; When the measurement related to the circuit switching network is performed using the parameter group set by the means and the reselection criteria regarding the circuit switching network are satisfied, the circuit belongs to the circuit switching network via the circuit switching network transmitting / receiving means. And a controlling means for controlling to reselect the base station.

  In order to solve the above-described problem, the communication processing method of the present invention uses a radio signal and a base station belonging to a circuit switching network including at least one of UTRAN, GERAN, and cdma2000 1x CS access network. Send and receive, connect to the circuit switching network, transmit and receive with the base station belonging to E-UTRAN that forms one integrated communication network together with the circuit switching network using radio signals, and the line is waiting on the base station belonging to E-UTRAN When there is a call origination / reception request related to the switching network, a parameter group used when reselecting a base station belonging to the circuit switching network is set, and the measurement related to the circuit switching network is performed using the set parameter group. If the reselection criteria related to the switching network are satisfied, control is performed so that the base station belonging to the circuit switching network is reselected, and there is a transmission request from the circuit switching network while waiting in E-UTRAN, and the base station belongs to the circuit switching network. When reselection of a base station fails or connection establishment to a base station belonging to a circuit switched network fails, a connection request is transmitted to the base station belonging to E-UTRAN, and the base station belonging to E-UTRAN It is characterized in that it establishes a connection to the network and sends it to the circuit switched network via the previous E-UTRAN.

  In order to solve the above-described problem, the communication processing method of the present invention uses a radio signal and a base station belonging to a circuit switching network including at least one of UTRAN, GERAN, and cdma2000 1x CS access network. Send and receive, connect to the circuit switching network, transmit and receive with the base station belonging to E-UTRAN that forms one integrated communication network together with the circuit switching network using radio signals, and the line is waiting on the base station belonging to E-UTRAN When there is a call origination / reception request related to the switching network, a parameter group used when reselecting a base station belonging to the circuit switching network is set, and the measurement related to the circuit switching network is performed using the set parameter group. If the reselection criteria for the switching network are met, control is performed so that the base station belonging to the circuit switching network is reselected, and there is an incoming request from the circuit switching network while waiting in E-UTRAN, and the base station belongs to the circuit switching network. When reselection of a base station fails or connection establishment to a base station belonging to a circuit switched network fails, a paging response is transmitted to the base station belonging to E-UTRAN, and the base station belonging to E-UTRAN And a Paging response is interpreted, and the Paging response is transmitted to the circuit switching network.

  According to the present invention, when waiting in E-UTRAN, cell reselection of an access network other than E-UTRAN is suitably performed, and outgoing / incoming processing to the CS access network can be appropriately performed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The mobile radio terminal according to the present invention can communicate with both an E-UTRAN base station and a CS access network base station. Also, the mobile communication network targeted by the present invention is configured so that the E-UTRAN and the CS access network can be configured as one integrated network and can cooperate, as in EPS described in TS23.272. Each component of EPS is connected, and it is configured so that a mobile radio terminal waiting in E-UTRAN can use the CS service. In the embodiment of the present invention, an integrated network of E-UTRAN and CS access network, such as EPS, is defined as an “integrated communication network”.

  FIG. 5 shows the internal configuration of the mobile radio terminal 1 according to the present invention. The mobile radio terminal 1 mainly includes an antenna 31, a radio transmission / reception unit 32, a signal processing unit 33, a control unit 39, a storage unit 40, an E-UTRAN intermittent reception clock generation unit 43, and the like.

  The mobile radio terminal 1 can perform voice communication and data communication by any mobile radio communication system of E-UTRAN system and CS access network system, and includes an antenna 31, a radio transmission / reception unit 32, and a signal processing unit. 33 corresponds to both of these types. Also, the CS access network method can take several methods, for example, a method using UTRAN, GERAN, or 1x CS access network. In the embodiment of the present invention, a case where, for example, a 1x CS access network method is adopted as the CS access network method is explicitly described.

  The radio transmission / reception unit 32 performs radio communication with the base station BS accommodated in the mobile communication network via the antenna 31 using the E-UTRAN scheme or the 1x CS access network scheme. The radio transmission / reception unit 32 generates a radio signal having a carrier frequency instructed from the control unit 39 based on the modulation signal generated by the signal processing unit 33. The radio transmission / reception unit 32 receives a radio signal having a carrier frequency instructed from the control unit 39, mixes it with the local oscillation signal output from the frequency synthesizer, and converts the frequency into an intermediate frequency signal (down-conversion). Then, the radio transmission / reception unit 32 orthogonally demodulates the down-converted intermediate frequency signal and outputs a reception baseband signal. The reception result is output to the signal processing unit 33 and the control unit 39.

  The signal processing unit 33 is configured by a DSP (Digital Signal Processor) or the like, and performs predetermined signal processing on the received baseband signal to obtain received packet data in a predetermined transmission format. The signal processing unit 33 demodulates the audio signal included in the received packet data and decodes the demodulation result to obtain audio data and the like. On the other hand, the signal processing unit 33 encodes the transmission voice signal, generates a modulation signal based on the voice data obtained by the encoding and other data, and outputs the generated modulation signal to the radio transmission / reception unit 32. .

  The control unit 39 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), and a RAM (Random Access Memory). The CPU is loaded into the RAM from the program stored in the ROM or the storage unit 40. In addition to executing various processes according to various application programs and control programs including an operating system (OS), the mobile radio terminal 1 is comprehensively controlled by generating various control signals and supplying them to the respective units. Specifically, the carrier frequency used by the wireless transmission / reception unit 32 is controlled, and a pilot signal is searched based on the reception result of the wireless transmission / reception unit 32. The RAM appropriately stores data necessary for the CPU to execute various processes.

  The control unit 39 includes one or a plurality of CPUs as necessary. In the embodiment of the present invention, an example in which two CPUs are provided is shown. However, the present invention is not limited to this, and control may be performed with one CPU, or with three or more CPUs. It may be. The communication system control unit 39a includes a communication processing CPU (not shown) and performs control used for communication processing. The communication system control unit 39a controls communication processing using the antenna 31, the wireless transmission / reception unit 32, the signal processing unit 33, the PCM codec 34, the reception amplifier 35, the transmission amplifier 37, and the like. On the other hand, the UI control unit 39b includes a UI processing CPU (not shown) and controls UI processing using the storage unit 40, the operation unit 41, the display unit 42, the clock circuit 46, and the like.

  The communication system control unit 39a of the mobile radio terminal 1 includes an E-UTRAN L1 unit having a function of connecting to E-UTRAN and a 1x CS access network L1 unit having a function of connecting to a 1x CS access network. The E-UTRAN L1 unit and the 1x CS access network L1 unit are lower-layer protocols of the radio interface, and these processes are controlled by the communication processing CPU of the mobile radio terminal 1.

  The storage unit 40 includes, for example, a flash memory element that is an electrically rewritable and erasable nonvolatile memory, an HDD (Hard Disc Drive), and the like, and various application programs executed by the CPU of the control unit 39 and various types. Data group, control program and control data of the mobile radio terminal 1, and identification information uniquely assigned to the mobile radio terminal 1 or the user. In addition, the storage unit 40 appropriately stores phone book data in which names and telephone numbers are associated, data acquired by data communication, and downloaded data. The power supply circuit 45 generates a predetermined operating power supply voltage Vcc based on the output of the battery 44 and supplies it to each circuit unit. The mobile radio terminal 1 is provided with a clock circuit (timer) 46 that measures the current time.

  The E-UTRAN intermittent reception clock generation unit 43 generates an E-UTRAN intermittent reception clock for performing intermittent reception when performing synchronization with E-UTRAN and monitoring incoming information notified to the mobile radio terminal 1 Then, the generated E-UTRAN intermittent reception clock is output to the control unit 39.

  The mobile radio terminal 1 includes a reception amplifier 35, a speaker 36 that outputs a reception voice signal and a transmission amplifier 37, a microphone 38 that inputs a transmission voice signal, an operation unit 41 that receives a request from a user, and received data. A display unit 42 for displaying a base image is provided.

If the mobile radio terminal 1 detects an E-UTRAN base station and is ready for E-UTRAN, the mobile radio terminal 1 prepares for an incoming call notification from the E-UTRAN side or a call from the mobile radio terminal 1. The terminal maintains synchronization with the E-UTRAN base station. That is, the mobile radio terminal 1 waits in E-UTRAN, and the E-UTRAN L1 part of the communication system control unit 39a designates from E-UTRAN to maintain synchronization with the E-UTRAN base station and monitor incoming calls. Intermittent reception using the intermittent reception cycle (DRX _E-UTRAN ). In addition, while the mobile radio terminal is waiting in E-UTRAN, the mobile radio terminal is in the vicinity in preparation for searching for a neighboring base station and reselecting a base station according to the contents specified in TS36.304. Base station measurements can be performed. Here, in order to simplify the description, it is assumed that a base station of the 1x CS access network exists as a peripheral base station.

  Next, with reference to the flowchart of FIG. 6, the cell reselection operation in the mobile radio terminal 1 of the present invention when there is an outgoing / incoming call to the 1x CS access network while waiting in E-UTRAN will be described.

  In step S21, the E-UTRAN L1 unit of the communication system control unit 39a performs an intermittent wake-up for E-UTRAN incoming monitoring based on the E-UTRAN intermittent reception clock from the E-UTRAN intermittent reception clock generation unit 43. Do. Then, the E-UTRAN L1 unit of the communication system control unit 39a controls the radio transmission / reception unit 32 and the signal processing unit 33 to perform E-UTRAN intermittent reception.

  In step S22, the communication system control unit 39a determines whether or not there is an outgoing / incoming request regarding the 1x CS access network while waiting for E-UTRAN. Specifically, the communication system control unit 39a waits for E-UTRAN by receiving the Paging (1x RTT CS Paging) from the 1x CS access network in 5. shown in FIG. It is determined that there is an incoming request to the 1x CS access network. On the other hand, the communication system control unit 39a determines that there has been a request for transmission to the CS access network when an instruction for transmission to the CS access network is received by operating the operation unit 41 by the user.

If the communication system control unit 39a determines in step S22 that there is an outgoing / incoming request for the 1x CS access network while waiting for E-UTRAN, the 1x CS access network L1 unit of the communication system control unit 39a reselects the cell in step S23. Set the parameter to CS Fallback mode, and adjust the parameter group related to cell reselection of TS36.304 by setting to CS Fallback mode. Specifically, the 1x CS access network L1 unit of the communication system control unit 39a is set to ignore (S _intrasrch ) first, and _secondly , is an access network other than E-UTRAN subject to cell reselection. 1x CS access network Reselection Priority)> (Currently E-UTRAN Reselection Priority), 3rd set Treselection _RAT (Treselection _{CDMA_1xRTT} ) = 0, 4th (Thresh _{x, high} ) Set to the standby cell selection reference value of the 1x CS access network (that is, the minimum numerical value required for connection to the 1x CS access network).

In step S24, the 1x CS access network L1 unit of the communication system control unit 39a determines whether or not the cell measurement start condition (cell measurement start conditions 1 and 2 described above) regarding the 1x CS access network is satisfied. Here, _firstly (S _intrasrch ) is ignored by the CS Fallback mode setting in step S23, and _secondly , the Reselection Priority of the 1x CS access network is set higher than the Reselection Priority of the currently waiting E-UTRAN. Therefore, the cell measurement start condition 1 is automatically satisfied.

  If it is determined in step S24 that the 1x CS access network L1 part of the communication control unit 39a satisfies the cell measurement start condition for the 1x CS access network, the 1x CS access network L1 part of the communication control unit 39a is 1x in step S25. In order to immediately start cell measurement related to the CS access network, the reception circuit for the 1x CS access network of the wireless transmission / reception unit 32 is activated to synchronize with the 1x CS access network. That is, the synchronization of radio frames transmitted from the 1x CS access network L1 unit of the communication system control unit 39a and the 1x CS access network base station BS is acquired, and in the case of the 1x CS access network, the radio frame of the Sync channel ) To get. As a result, synchronization with the 1x CS access network can be acquired. In step S26, the 1x CS access network L1 unit of the communication system control unit 39a performs measurement related to the cell of the 1x CS access network.

In step S27, the 1x CS access network L1 unit of the communication control unit 39a determines whether or not the cell reselection criteria (cell reselection criteria 1 and 2 described above) regarding the 1x CS access network are satisfied. Here, according to the CS Fallback mode setting in step S23, _thirdly , Treselection _RAT (Treselection _{CDMA_1xRTT} ) = 0 is set, and _fourthly (Thresh _{x, high} ) is set as the reference cell selection reference value of the 1x CS access network. Therefore, if it is determined that the standby level in the 1x CS access network is possible based on the measurement result of the cell in the 1x CS access network, the reselection criterion 1 is automatically satisfied. Become.

If it is determined in step S27 that the 1x CS access network L1 part of the communication system control unit 39a satisfies the cell reselection criteria for the 1x CS access network, the 1x CS access network L1 part of the communication system control unit 39a performs wireless communication in step S28. The transmitter / receiver 32 and the signal processor 33 are controlled to reselect a cell of the 1x CS access network. On the other hand, if it is determined in step S27 that the 1x CS access network L1 part of the communication system control unit 39a does not satisfy any cell reselection criteria for the 1x CS access network, the 1x CS access network L1 part of the communication system control unit 39a In step S29, the cell of the 1x CS access network is not reselected, and in step S30, an E-UTRAN intermittent reception timer is set using the intermittent reception period (DRX _E-UTRAN ) designated by _E-UTRAN . In step S31, the 1x CS access network L1 unit of the communication system control unit 39a starts the count operation of the set E-UTRAN intermittent reception timer. In step S32, the 1x CS access network L1 unit of the communication system control unit 39a Controls the radio transmission / reception unit 32 and the signal processing unit 33, stops the circuit for E-UTRAN, and sleeps. On the other hand, if it is determined in step S24 that the 1x CS access network L1 part of the communication system control unit 39a does not satisfy the cell measurement start condition for the 1x CS access network, the process proceeds to step S29.

  If the communication control unit 39a determines in step S22 that there is no outgoing / incoming request for the 1x CS access network while waiting for E-UTRAN, the process in step S23 is skipped and the cell reselection parameter is set to the default value. The cell reselection process is executed as it is. When a cell of the 1x CS access network is reselected while waiting for E-UTRAN, the mobile radio terminal 1 connects to the cell of the reselected 1x CS access network, and the 1x CS access network It becomes possible to communicate with the cell.

  In the flowchart of FIG. 6, the cell reselection operation when there is a transmission request or a reception request to the 1x CS access network at any timing during the E-UTRAN intermittent reception processing is described. However, a call request to the 1x CS access network is an event that occurs regardless of the E-UTRAN intermittent reception process, and a call request to the 1x CS access network is caused by the mobile radio terminal 1 waking up E-UTRAN intermittently. This may occur not only during sleep but also while the mobile radio terminal 1 is sleeping. When a call request to the 1x CS access network is generated at a timing other than the time when the mobile radio terminal 1 wakes up intermittently in E-UTRAN, the mobile radio terminal 1 performs the cell reselection operation shown in FIG. Is done. Note that the processing in steps S41 to S48 in FIG. 7 is basically the same as the processing in steps S22 to S29 in FIG.

  In an embodiment of the present invention, a base station belonging to a mobile communication network that transmits and receives with a base station belonging to a circuit switched network using a radio signal and is connected to the circuit switched network and forms one integrated communication network together with the circuit switched network If there is an outgoing / incoming request for a circuit switched network while waiting at a base station belonging to a mobile communication network, a base station belonging to the circuit switched network or a base belonging to the circuit switched network A parameter group used when reselecting a cell within a range where radio waves radiated from a station are reachable is set as a first parameter group, and the wireless transmission / reception unit 32 is activated using the set parameter group If the synchronization with the base station belonging to the circuit switching network is acquired, the circuit switching network measurement is performed, and the cell reselection criteria for the circuit switching network is satisfied, the circuit switching network transmitting / receiving means is used. Te, it can be controlled so as to reselect the base station or cell belonging to the circuit switched network. As a result, when it is determined that there is an outgoing / incoming request for the 1x CS access network while waiting for E-UTRAN, if a cell at a level that can be waited for the 1x CS access network can be detected by measurement, Cell reselection can be made immediately. As a result, it is possible to immediately shift to outgoing / incoming processing for the 1x CS access network. Furthermore, the conventional cell reselection measurement and reselection determination processing can be used as they are, and the change of the mobile radio terminal 1 can be minimized.

  As described above, when waiting in E-UTRAN, cell reselection of an access network other than E-UTRAN is preferably performed, and outgoing / incoming processing to the CS access network can be appropriately performed.

  In the embodiment of the present invention, “reselection of base station” means not only reselection of the base station itself but also one cell or a plurality of cells that are reachable by radio waves radiated from the base station. It also includes reselection of cells (a plurality of cells divided by sector).

  In the cell reselection operation described with reference to the flowchart of FIG. 6, the 1x CS access network is used as the circuit switching network. However, the present invention is applied to other CS access networks (for example, UTRAN and GERAN). May be applied.

  By the way, in the cell reselection operation described with reference to the flowchart of FIG. 6, when a cell of the 1x CS access network is reselected while waiting for E-UTRAN, the mobile radio terminal 1 performs the reselected 1x CS. It is possible to connect to the access network cell and communicate with the 1x CS access network cell. However, although the cell of the 1x CS access network was reselected, for example, because the power of the cell reselection destination of the 1x CS access network is insufficient locally, it is no longer at a level where communication can be performed on the 1x CS access network side. There may be situations where the connection to the 1x CS access network must be terminated. Therefore, in such a case, the connection to the 1x CS access network must be stopped and the CS Fall back mode setting must be appropriately controlled. Hereinafter, the CS Fallback setting continuation determination operation for the 1x CS access network using this method will be described.

  With reference to the flowchart of FIG. 8, the CS Fallback setting continuation determination operation in the mobile radio terminal 1 of FIG. 5 will be described. This CS Fallback setting continuation determination operation is executed in parallel with the cell reselection operation of FIG.

  In step S51, when the 1x CS access network L1 unit of the communication system control unit 39a reselects the cell of the 1x CS access network while waiting for E-UTRAN, the radio transmission / reception unit 32 and the signal processing unit 33 are controlled and reselected. Connection is started to the base station corresponding to the cell of the 1x CS access network. In step S52, the 1x CS access network L1 unit of the communication system control unit 39a controls the radio transmission / reception unit 32 and the signal processing unit 33, and the connection to the base station corresponding to the cell of the reselected 1x CS access network is established. It is determined whether it has been established. If the 1x CS access network L1 unit of the communication system control unit 39a determines in step S52 that the connection to the base station corresponding to the cell of the reselected 1x CS access network has been established, the 1x CS access network La unit 1a of the communication system control unit 39a In step S53, the CS access network L1 part cancels the CS Fallback mode setting, resets the cell reselection parameter set in the CS Fallback mode to a default value, and ends the CS Fallback mode. At this time, the mobile radio terminal 1 is connected to the base station corresponding to the cell of the reselected 1x CS access network, becomes connected, and can communicate.

  On the other hand, if the 1x CS access network L1 part of the communication system control unit 39a determines in step S52 that the connection to the base station corresponding to the cell of the reselected 1x CS access network has not been established, the communication system control The 1x CS access network L1 unit of the unit 39a reconnects to the base station corresponding to the cell of the reselected 1x CS access network and determines whether any CS Fallback mode cancellation condition is satisfied. To do. Here, as the CS Fallback mode stop condition, for example, a condition related to the number of times of connection and a condition related to a certain time after the start of connection to the 1x CS access network are set in advance. Then, the 1x CS access network L1 part of the communication system control unit 39a re-selects the reselected 1x CS in parallel with re-connecting to the base station corresponding to the cell of the reselected 1x CS access network. Whether the connection to the base station corresponding to the cell in the access network does not exceed the number of connections (for example, 3 times) set as the CS Fallback mode cancellation condition, or a certain time from the start of connection to the 1x CS access network It is determined whether (for example, 5 minutes) has not elapsed.

  If it is determined in step S54 that the 1x CS access network L1 part of the communication system control unit 39a does not satisfy any of the CS Fallback mode cancellation conditions, the 1x CS access network L1 part of the communication system control unit 39a determines in step S55. Then, the CS Fallback mode setting is continued, the process proceeds to Step S51, and the 1x CS access network L1 unit of the communication control unit 39a is reselected until one of the preset CS Fallback mode stop conditions is satisfied. Try repeatedly to connect to the base station corresponding to the cell of the CS access network. On the other hand, if the 1x CS access network L1 part of the communication system control unit 39a determines in step S54 that any CS Fallback mode cancellation condition is satisfied, the process proceeds to step S53, and the 1x CS access of the communication system control unit 39a is performed. The network L1 part cancels the CS Fallback mode setting, resets the cell reselection parameter set by the CS Fallback mode to the default value, and ends the CS Fallback mode. Of course, the CS Fallback mode is not terminated, but the CS Fallback mode setting is maintained, and then the process returns to Step 26 in FIG. 6 again to perform measurement related to the 1x CS access network cell and the 1x CS access network cell. May be selected again.

  As a result, the CS Fall back mode setting can be appropriately controlled in conjunction with the operation of canceling the connection to the 1x CS access network, and in the case of CS fallback mode until the predetermined CS Fallback mode stop condition is satisfied, You can try to connect to the network repeatedly. Therefore, the connection rate to the 1x CS access network can be further increased. As a result, when waiting in E-UTRAN, cell reselection of an access network other than E-UTRAN is suitably performed, and outgoing / incoming processing to the CS access network can be appropriately performed.

  In the CS Fallback setting continuation determination operation described with reference to the flowchart of FIG. 8, the 1x CS access network is used as the circuit switching network, but other CS access networks (for example, UTRAN and GERAN) are also used. You may make it apply this invention.

  In addition, in the case of the CS Fallback setting continuation determination operation described with reference to FIG. 8, the connection to the 1x CS access network is canceled if the cell of the 1x CS access network is reselected but the predetermined CS Fallback mode stop condition is satisfied. Will be. In this case, in consideration of usability, it is preferable to perform outgoing / incoming call processing using an access network other than the 1x CS access network that cannot be connected. Therefore, when the connection attempt to the 1x CS access network fails, the connection with the base station network is continued using another access network. The operation using this method will be described below.

  FIG. 9 shows a case where a connection is made in E-UTRAN instead of the 1x CS access network, which is difficult to connect, when the mobile radio terminal 1 makes an incoming / outgoing request for the 1x CS access network while waiting in E-UTRAN. The sequence of the process between each component of a mobile radio terminal and EPS is shown. In the case of FIG. 9, it is assumed that the connection to the base station corresponding to the cell of the reselected 1x CS access network cannot be established.

In step S101, the mobile radio terminal (UE) 1 waits in E-UTRAN, maintains the synchronization with the E-UTRAN base station, and monitors the incoming call, and receives an intermittent reception period (DRX specified by E-UTRAN). _E-UTRAN ) to wake up intermittently and perform intermittent reception. In step S102, when the 1x CS access network L1 unit of the communication system control unit 39a receives a call request to the 1x CS access network, the cell reselection operation to the 1x CS access network shown in FIG. 6 or FIG. The CS Fallback setting continuation determination operation for the 1x CS access network shown in FIG. 8 is performed. When the connection to the base station of the 1x CS access network is unsuccessful, the E-UTRAN L1 unit of the communication system control unit 39a starts the connection using the currently waiting E-UTRAN. That is, the E-UTRAN L1 unit of the communication system control unit 39a controls the wireless transmission / reception unit 32 and the signal processing unit 33, transmits a connection request to the E-UTRAN, and performs a voice call (VoIP call in E-UTRAN). ) Service to E-UTRAN. Thereafter, in step S104, the E-UTRAN L1 unit of the communication system control unit 39a establishes a connection with the E-UTRAN. At this time, when the communication destination is only 1x RTT, domain conversion (TS23 .206, TS24.206), and the E-UTRAN-1x RTT is connected.

  FIG. 10 shows a case where a connection is made in E-UTRAN instead of the 1x CS access network, which is difficult to connect, when an incoming request is received from the 1x CS access network while the mobile radio terminal 1 is waiting in E-UTRAN. The sequence of the process between each component of a mobile radio terminal and EPS is shown.

In step S121, the mobile radio terminal (UE) 1 waits in E-UTRAN, maintains the synchronization with the E-UTRAN base station, and monitors the incoming call, and receives an intermittent reception period (DRX specified by E-UTRAN). _E-UTRAN ) to wake up intermittently and perform intermittent reception. In step S122, when the 1x CS access network L1 unit of the communication system control unit 39a receives the incoming request from the 1x CS access network, the cell reselection operation to the 1x CS access network shown in FIG. 6 or FIG. The CS Fallback setting continuation determination operation for the 1x CS access network shown in FIG. 8 is performed. If the connection to the base station of the 1x CS access network fails in step S123, the E-UTRAN L1 unit of the communication system control unit 39a controls the radio transmission / reception unit 32 and the signal processing unit 33, and the E-UTRAN Returns Paging Response for. This Paging response indicates that the mobile radio terminal 1 can be connected by E-UTRAN. As a result, for example, in the case of incoming CS voice, it is possible to notify the E-UTRAN base station that connection by VoIP (Voice over IP) is possible. The E-UTRAN side can interpret this Paging response, send a paging response to the incoming call request source, convert the caller's CS connection and VoIP, and connect to realize a voice call. At this time, in step S124, the MME interprets that it is a Paging response from E-UTRAN, transmits a response (paging response) to 1x RTT CS Paging to the 1x CS IWS, and the 1x CS IWS receives from the MME. Transmit paging response to 1xRTT MSC.

  In step S125, the E-UTRAN L1 unit of the communication system control unit 39a controls the radio transmission / reception unit 32 and the signal processing unit 33, and uses the Domain Transfer function in accordance with TS23.206 and TS24.206 to establish the CS connection of the caller. Convert and connect VoIP to make voice calls.

  As a result, even if the connection to the 1x CS access network using the CS Fallback function fails, the CS system service can be received by performing the E-UTRAN connection. Therefore, when waiting in E-UTRAN, cell reselection of an access network other than E-UTRAN is suitably performed, and outgoing / incoming processing to the CS access network can be performed more appropriately.

  9 and 10, the 1x CS access network is used as the circuit switching network in the processing, but the present invention is also applied to other CS access networks (for example, UTRAN, GERAN, etc.). It may be. 9 and FIG. 10 not only when the connection to the base station of the 1x CS access network cannot be established, but also when the reselection to 1x RTT fails as shown in FIG. 9 and FIG. This can also be applied to the case where the base station of the 1x CS access network is not reselected.

  The series of processes described in the embodiments of the present invention can be executed by software, but can also be executed by hardware.

  Furthermore, in the embodiment of the present invention, the steps of the flowchart show an example of processing performed in time series in the order described, but parallel or individual execution is not necessarily performed in time series. The processing to be performed is also included.

The figure which shows the outline of EPS which has CS Fallback function. The figure which shows the sequence of the process between each structure of a mobile radio | wireless terminal and EPS at the time of transmitting with respect to a 1x CS access network, when a mobile radio | wireless terminal is waiting in E-UTRAN. The figure which shows the sequence of the process between a mobile radio | wireless terminal and EPS each component at the time of processing the incoming call from a 1x CS access network, when a mobile radio | wireless terminal is waiting in E-UTRAN. 6 is a flowchart for explaining a cell reselection operation during standby for E-UTRAN performed by a mobile radio terminal based on cell measurement start conditions and cell reselection criteria. The block diagram which shows the structure inside the mobile radio | wireless terminal which concerns on this invention. 6 is a flowchart for explaining cell reselection processing when there is an incoming / outgoing call to the 1x CS access network during standby in E-UTRAN in the mobile radio terminal of FIG. 6 is a flowchart for explaining cell reselection processing when there is a call to the 1x CS access network while waiting in E-UTRAN in the mobile radio terminal of FIG. 6 is a flowchart for explaining a CS Fallback setting continuation determination operation in the mobile radio terminal of FIG. 5. When a mobile radio terminal is waiting in E-UTRAN and there is a call request for a 1x CS access network, the mobile radio terminal and EPS when connecting with E-UTRAN instead of the difficult 1x CS access network The figure which shows the sequence of the process between each structure of these. When there is an incoming call request from the 1x CS access network while the mobile radio terminal is waiting in E-UTRAN, the mobile radio terminal and EPS when connecting with E-UTRAN instead of the difficult 1x CS access network The figure which shows the sequence of the process between each structure of these.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Mobile radio | wireless terminal, 31 ... Antenna, 32 ... Radio transmission / reception part, 33 ... Signal processing part, 34 ... PCM codec, 35 ... Reception amplifier, 36 ... Speaker, 37 ... Transmission amplifier, 38 ... Microphone, 39 ... Control part , 40 ... storage section, 41 ... operation section, 42 ... display section, 43 ... E-UTRAN intermittent reception clock generation section, 44 ... battery, 45 ... power supply circuit, 46 ... clock circuit.

Claims (21)

A circuit-switched network transmission / reception means for transmitting / receiving data using a radio signal to / from a base station belonging to the circuit-switched network;
A mobile communication network transmission / reception means connected to the circuit switching network and transmitting / receiving using a radio signal with a base station belonging to the mobile communication network forming one integrated communication network together with the circuit switching network;
Setting means for setting a parameter group used when reselecting a base station belonging to the circuit-switched network when there is an outgoing / incoming request for the circuit-switched network while waiting at a base station belonging to the mobile communication network When,
When the parameter group set by the setting means is used for measurement related to the circuit switched network and the reselection criteria for the circuit switched network are satisfied, the base belonging to the circuit switched network is transmitted via the circuit switched network transmitting / receiving means. A mobile radio terminal comprising: control means for controlling to reselect a station.   The mobile radio terminal according to claim 1, wherein the setting unit sets the parameter group so as to satisfy a measurement start condition and a reselection criterion for the circuit switched network.   The setting means sets the parameter group when there is a call origination / reception request related to the circuit switched network while waiting at a base station belonging to the mobile communication network, and a base station belonging to the same frequency of the mobile communication network is set. A setting for ignoring a threshold used for station search start determination, a selection priority value of the circuit-switched network to be reselected is set higher than a selection priority of the mobile communication network, and the circuit-switched network A base station belonging to the circuit switched network in the case where the observation period of the base station belonging to is set to zero and the selection priority value of the circuit switched network to be reselected is higher than the selected priority of the mobile communication network 3. The mobile radio terminal according to claim 2, wherein a threshold value used for reselection determination is set to a minimum numerical value required for connection to the circuit switching network.   When there is an outgoing / incoming request related to the circuit switched network while waiting at a base station belonging to the mobile communication network, the setting means replaces the parameter group with a preset first parameter group, The mobile radio terminal according to claim 1, wherein the mobile radio terminal is changed to a second parameter group different from the first parameter group. A connection means for connecting via the circuit switching network to a base station belonging to the circuit switching network reselected by the control means;
The setting means maintains the state in which the parameter group remains set to the second parameter group until connection to a base station belonging to the reselected circuit switching network is established.
The control means repeatedly performs connection to the reselected base station belonging to the circuit switched network until connection to the base station belonging to the circuit switched network is established unless a predetermined condition is satisfied. The mobile radio terminal according to claim 4.   The control means stops connection to the reselected base station belonging to the circuit switching network when the number of times of unsuccessful connection to the base station belonging to the circuit switching network reaches a predetermined number of times. The mobile radio terminal according to claim 5.   The control means reconnects when a predetermined time elapses from the start of connection to the reselected base station belonging to the circuit switching network in a state where the connection to the base station belonging to the circuit switching network is not established. 6. The mobile radio terminal according to claim 5, wherein connection to a base station belonging to the selected circuit switching network is stopped.   The setting means resets the parameter group to the first parameter group instead of the second parameter group when connection to a base station belonging to the reselected circuit switching network is stopped. The mobile radio terminal according to claim 6 or 7, characterized in that   The setting means cancels ignoring setting relating to a threshold value used for search start determination of a base station belonging to the same frequency of the mobile communication network, and sets a selection priority value of the circuit-switched network to be reselected. Canceling the setting higher than the selection priority of the mobile communication network, setting the observation period of the base station belonging to the circuit switched network to a predetermined reference period instead of zero, and re-selecting the circuit switched network A threshold used for reselection determination of a base station belonging to the circuit switched network when a selection priority value is higher than a selection priority of the mobile communication network is set to a predetermined reference value. The mobile radio terminal according to claim 8.   The setting means resets the parameter group to the first parameter group instead of the second parameter group when a connection to a base station belonging to the reselected circuit switching network is established. The mobile radio terminal according to claim 5, wherein   The setting means cancels ignoring setting relating to a threshold value used for search start determination of a base station belonging to the same frequency of the mobile communication network, and sets a selection priority value of the circuit-switched network to be reselected. Canceling the setting higher than the selection priority of the mobile communication network, setting the observation period of the base station belonging to the circuit switched network to a predetermined reference period instead of zero, and re-selecting the circuit switched network A threshold used for reselection determination of a base station belonging to the circuit switched network when a selection priority value is higher than a selection priority of the mobile communication network is set to a predetermined reference value. The mobile radio terminal according to claim 10.   There is a call request to the circuit switching network while waiting in the mobile communication network, and reselection of a base station belonging to the circuit switching network has failed, or connection establishment to a base station belonging to the circuit switching network is established If the connection fails, the connection means transmits a connection request to the base station belonging to the mobile communication network via the mobile communication network transmitting / receiving means, and connects to the base station belonging to the mobile communication network. The mobile radio terminal according to claim 5, wherein the mobile radio terminal is established.   There is an incoming call request from the circuit switching network while waiting in the mobile communication network, and reselection of a base station belonging to the circuit switching network has failed, or connection establishment to a base station belonging to the circuit switching network is established When the connection fails, the connection means transmits a Paging response to the base station belonging to the mobile communication network via the mobile communication network transmitting / receiving means, and connects to the base station belonging to the mobile communication network. The mobile radio terminal according to claim 5, wherein the mobile radio terminal is established.   When there is a transmission request regarding the circuit switching network during the intermittent reception process by the mobile communication network transmission / reception means executed at the intermittent reception cycle specified by the mobile communication network or other than the intermittent reception process, The mobile radio terminal according to claim 1, wherein the setting means sets the parameter group. Send and receive with base stations belonging to the circuit switched network using radio signals,
Sending and receiving using a radio signal to and from a base station belonging to a mobile communication network that is connected to the circuit switching network and forms one integrated communication network together with the circuit switching network;
When there is an outgoing / incoming request for the circuit switching network while waiting at a base station belonging to the mobile communication network, a parameter group used when reselecting a base station belonging to the circuit switching network is set,
Measurement is performed on the circuit switched network using the set parameter group, and control is performed to reselect a base station belonging to the circuit switched network when a reselection criterion on the circuit switched network is satisfied. Communication processing method.   There is an incoming call request from the circuit switching network while waiting in the mobile communication network, and reselection of a base station belonging to the circuit switching network has failed, or connection establishment to a base station belonging to the circuit switching network is established If the communication fails, the Paging response is transmitted to the base station belonging to the mobile communication network, the connection to the base station belonging to the mobile communication network is established, the Paging response is interpreted, and the circuit switching is performed. The communication processing method according to claim 15, wherein a Paging response is transmitted to the network. Circuit-switched network transmitting / receiving means for transmitting and receiving using radio signals with a base station belonging to a circuit-switched network including at least one of UTRAN, GERAN, and cdma2000 1x CS access network;
A mobile communication network transmitting / receiving means connected to the circuit switched network and transmitting / receiving using a radio signal with a base station belonging to E-UTRAN, which forms one integrated communication network together with the circuit switched network;
A setting means for setting a parameter group used when reselecting a base station belonging to the circuit switching network when there is an outgoing / incoming request regarding the circuit switching network while waiting at a base station belonging to the E-UTRAN; ,
When the parameter group set by the setting means is used for measurement related to the circuit switched network and the reselection criteria for the circuit switched network are satisfied, the base belonging to the circuit switched network is transmitted via the circuit switched network transmitting / receiving means. A mobile radio terminal comprising: control means for controlling to reselect a station.   The mobile radio terminal according to claim 17, wherein the integrated communication network has a CS Fallback function.   The mobile radio terminal according to claim 17, wherein the circuit switching network is a cdma2000 1x CS access network. Using radio signals to transmit / receive to / from a base station belonging to a circuit switched network including at least one of UTRAN, GERAN, and cdma2000 1x CS access network,
Sending and receiving using a radio signal to and from a base station belonging to E-UTRAN, which is connected to the circuit switching network and forms one integrated communication network together with the circuit switching network,
When there is an outgoing / incoming request for the circuit switched network while waiting at the base station belonging to the E-UTRAN, a parameter group used when reselecting the base station belonging to the circuit switched network is set,
Perform measurement related to the circuit switched network using the set of parameters, and when reselection criteria related to the circuit switched network are satisfied, control to reselect a base station belonging to the circuit switched network,
There is a transmission request from the circuit switching network while waiting in the E-UTRAN, and reselection of a base station belonging to the circuit switching network has failed, or connection establishment to a base station belonging to the circuit switching network is established In case of failure, a connection request is transmitted to the base station belonging to the E-UTRAN to establish a connection to the base station belonging to the E-UTRAN, and to the circuit switched network via the previous E-UTRAN. A communication processing method characterized by transmitting. Using radio signals to transmit / receive to / from a base station belonging to a circuit switched network including at least one of UTRAN, GERAN, and cdma2000 1x CS access network,
Sending and receiving using a radio signal to and from a base station belonging to E-UTRAN, which is connected to the circuit switching network and forms one integrated communication network together with the circuit switching network,
When there is an outgoing / incoming request for the circuit switched network while waiting at the base station belonging to the E-UTRAN, a parameter group used when reselecting the base station belonging to the circuit switched network is set,
Perform measurement related to the circuit switched network using the set of parameters, and when reselection criteria related to the circuit switched network are satisfied, control to reselect a base station belonging to the circuit switched network,
There is an incoming call request from the circuit switching network while waiting in the E-UTRAN, and reselection of a base station belonging to the circuit switching network has failed, or connection establishment to a base station belonging to the circuit switching network is established In the case of failure, a Paging response is transmitted to the base station belonging to the E-UTRAN, a connection to the base station belonging to the E-UTRAN is established, the Paging response is interpreted, and the Paging is transmitted to the circuit switching network. A communication processing method characterized by transmitting a response.

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