WO2014057691A1 - Dispositif de détermination de transfert, dispositif de commande de transfert, procédé de détermination de transfert, procédé de commande de transfert, programme de détermination de transfert et programme de commande de transfert - Google Patents

Dispositif de détermination de transfert, dispositif de commande de transfert, procédé de détermination de transfert, procédé de commande de transfert, programme de détermination de transfert et programme de commande de transfert Download PDF

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Publication number
WO2014057691A1
WO2014057691A1 PCT/JP2013/006104 JP2013006104W WO2014057691A1 WO 2014057691 A1 WO2014057691 A1 WO 2014057691A1 JP 2013006104 W JP2013006104 W JP 2013006104W WO 2014057691 A1 WO2014057691 A1 WO 2014057691A1
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WIPO (PCT)
Prior art keywords
handover
mobile terminal
command
call
request
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PCT/JP2013/006104
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English (en)
Japanese (ja)
Inventor
亜希 大橋
和仁 徳永
健太 大西
圭祐 笹田
Original Assignee
株式会社Ｎｔｔドコモ
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Priority to JP2014540758A priority Critical patent/JP6063473B2/ja
Publication of WO2014057691A1 publication Critical patent/WO2014057691A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface

Definitions

  • the present invention relates to a handover determination device, a handover control device, a handover determination method, a handover control method, a handover determination program, and a handover control program for controlling a handover that occurs when mobile terminals in a call move between different network communication networks.
  • a handover determination device a handover control device, a handover determination method, a handover control method, a handover determination program, and a handover control program for controlling a handover that occurs when mobile terminals in a call move between different network communication networks.
  • Non-Patent Document 1 defines an incoming call procedure by IMS (for example, incoming voice call).
  • IMS IP Multimedia Subsystem
  • LTE Long Term Evolution
  • 3G Third Generation, third generation mobile communication system
  • the LTE network is in a stage where communication facilities such as corresponding base stations are sequentially installed.
  • the LTE network often has a narrower service area than the 3G network in which many communication facilities are already installed.
  • SRVCC Single Radio Voice Call Continuity
  • Non-Patent Document 3 which is a standardization material related to SRVCC
  • SRVCC is an operation in which the state of a voice call of a mobile terminal is limited during a voice call, and transmission until a voice call is in progress. There is no provision for the operation of SRVCC during middle, incoming call, guidance or ringing.
  • the aSRVCC (alerting4SRVCC), which is the SRVCC when the voice call state of the mobile terminal is in the ringing state, is specified in Releases 10 and later of Non-Patent Documents 3 and 4.
  • the mobile terminal needs to support aSRVCC.
  • Non-Patent Documents 3 and 4 Stipulated in Release 12 and later.
  • the voice call state of the mobile terminal is a guidance in-progress state transmitted after the call is established, the SRVCC operation is performed as in the case of a voice call.
  • FIG. 11A is a sequence diagram showing the operation of the conventional SRVCC in the outgoing call state
  • FIG. 11B is a schematic diagram showing the relationship between the service areas of the LTE network and the 3G network.
  • a mobile terminal (UE: User Equipment) 30 communicates with a base station equipment (eNB: eNodeB) 40 of the LTE network 10 and is near the boundary of the service area of the LTE network 10. It is assumed that the user is in the service area of the 3G network 20.
  • UE User Equipment
  • eNB eNodeB
  • a call control device 70 such as S-CSCF or P-CSCF included in an IMS network (IMS NW) 50 performs call control of the mobile terminal 30.
  • the mobile terminal 30 is in a state (before transmission) before a bearer for voice call is established.
  • a call for making a voice call with the partner mobile terminal is started. It is assumed that the transmission side user starts from the vicinity of the boundary of the service area of the LTE network 10 and moves to the end of the area along with the mobile terminal 30 while starting the transmission. Since the mobile terminal 30 has moved near the end of the area of the LTE network 10, the radio quality from the LTE network 10 deteriorates. Therefore, the mobile terminal 30 transmits to the base station device 40 the wireless quality information 32 indicating that the current wireless quality has fallen below the threshold value of the wireless quality specified by the base station device 40 at time t1.
  • the base station device 40 determines that the voice call of the mobile terminal 30 is handed over from the LTE network 10 to the 3G network 20 to continue the call.
  • the base station device 40 transmits a handover request 132 for handing over the mobile terminal 30 from the LTE network 10 to the 3G network 20 to an MME (Mobile Management Entity) 42.
  • the MME 42 transmits an SRVCC request to the IMS network 50 via an MSC (Multimedia Switching Center) Server 44.
  • the IMS network 50 sends an SRVCC response via the MSC Server 44 that causes the mobile terminal 30 to SRVCC from the LTE network 10 to the 3G network 20 even though the voice call state of the mobile terminal 30 is in the outgoing state.
  • the MME 42 transmits a handover response command 252 to the base station device 40. Since the base station device 40 has received the handover response command 252, the base station device 40 transmits a handover instruction 152 to the mobile terminal 30 at time t 4. At time t5, the mobile terminal 30 executes a handover.
  • 3GPP The 3rd Generation Partnership Project
  • TS23.228 3GPP (The 3rd Generation Partnership Project) TS23.216
  • 3GPP The 3rd Generation Partnership Project
  • TS24.237 3GPP (The 3rd Generation Partnership Project) TS23.237
  • the mobile terminal 30 is still in a calling state and not in a calling state.
  • the operation of SRVCC when not in a call state is not defined in Non-Patent Document 3 (particularly Release 9).
  • the IMS network 50 cannot correctly perform SRVCC to the 3G NW 60.
  • the mobile terminal 30 is in a state where the voice protocol cannot be converted from the SIP protocol used in the IMS network 50 to the CC protocol to be used in the 3G NW 60, which may lead to call disconnection, And the IMS network 50 may become inconsistent.
  • the present invention has been made to solve the above-described problems of the prior art, and its purpose is to hand over a mobile terminal when a voice call state does not comply with the SRVCC regulations. Can prevent call disconnection of the mobile terminal and state mismatch between the mobile terminal and the IMS network, and further suppress transmission of unnecessary handover requests, thereby preventing the base station device and the IMS network from transmitting. It is to provide a handover determination device, a handover control device, a handover determination method, a handover control method, a handover determination program, and a handover control program that can reduce useless traffic.
  • a handover determination apparatus is capable of making a voice call or a video call between a first network communication network and a second network communication network having a common service area with the first network communication network.
  • a handover determination apparatus that receives a request for handover of a mobile terminal from a handover control apparatus, wherein a degradation in radio quality of the mobile terminal is detected during a voice call or a video call in the first network communication network.
  • a handover request for handing over the mobile terminal from the first network communication network to the second network communication network and continuing a call or a request based on the handover request is received from the handover control apparatus.
  • a handover request receiving unit When the request reception unit receives the handover request or the request based on the handover request, the call state acquisition unit that acquires the call state of the mobile terminal, and the mobile terminal performs the handover in the call state.
  • a mobile terminal information acquisition unit that acquires mobile terminal information including information on whether or not the mobile terminal is a possible mobile terminal, the call state acquired by the call state acquisition unit, and the mobile terminal information acquisition unit Based on the acquired mobile terminal information, if the mobile terminal is not capable of handover in the call state, it is determined that handover is not possible, and the mobile terminal is capable of handover in the call state.
  • the command transmission unit further outputs a handover suppression command for causing the handover control device to suppress transmission of the handover request when the handover determination unit determines that handover is not possible.
  • a handover for causing the handover control device to cancel the suppression of transmission of the handover request when the handover determination unit determines that a handover is possible after transmitting the handover suppression command to the handover control device A suppression release command may be transmitted.
  • the handover control apparatus can suppress transmission of a handover request, so that the mobile terminal is handed over when the call state does not comply with the SRVCC regulations. Can prevent call disconnection of the mobile terminal and state mismatch between the mobile terminal and the IMS network, and further suppress transmission of an unnecessary handover request, thereby preventing the base station device and the IMS network from transmitting. Unnecessary traffic can be reduced.
  • a handover control apparatus is capable of making a voice call or a video call between a first network communication network and a second network communication network having a common service area with the first network communication network.
  • a handover control apparatus that transmits a request for handover of a mobile terminal to a handover determination apparatus, wherein the radio quality information receives radio quality information transmitted by the mobile terminal residing in the first network communication network A reception unit; a radio quality determination unit that determines whether or not the radio quality of the mobile terminal in the first network communication network is degraded based on the radio quality information; and the radio quality determination unit includes the mobile terminal If it is determined that the wireless quality of the mobile device has deteriorated, the mobile terminal is moved from the first network communication network to the second network.
  • a handover request transmission unit for transmitting a handover request for continuing a call by handover to a work communication network to the handover determination device, and a response from the handover determination device to the handover request transmitted by the handover request transmission unit.
  • a command receiving unit that receives a handover response command, and a handover response unit that, when the command receiving unit receives the handover response command for performing the handover, transmits a handover instruction for causing the mobile terminal to perform the handover
  • a handover rejection unit that does not transmit the handover instruction to the mobile terminal when the command reception unit receives a handover rejection command for preventing the handover from being performed, and the command reception unit
  • a handover suppression command for suppressing transmission of a handover request is received, the handover request transmission unit is not operated, and the command reception unit receives a handover suppression cancellation command for canceling suppression of transmission of the handover request.
  • a handover request transmission limiting unit that operates the handover request transmission unit.
  • a handover determination method is capable of making a voice call or a video call between a first network communication network and a second network communication network having a common service area with the first network communication network.
  • a handover determination method for receiving a request for handover of a mobile terminal from a handover control apparatus, wherein degradation of radio quality of the mobile terminal is detected during a voice call or a video call in the first network communication network
  • a handover request for handing over the mobile terminal from the first network communication network to the second network communication network and continuing a call or a request based on the handover request is received from the handover control apparatus.
  • Mobile terminal information acquisition step of acquiring mobile terminal information including information on whether or not the mobile terminal is capable of, and the call state and mobile terminal information acquisition step of the call state acquisition step If the mobile terminal is not capable of the handover in the call state based on the mobile terminal information acquired by the mobile terminal, the mobile terminal determines that the handover is not possible, and the mobile terminal capable of the handover in the call state If there is a handover determination step for determining that handover is possible, and if the handover determination step determines that handover is not possible Transmits a handover reject command for preventing the handover control apparatus from performing the handover, and when the handover determination step determines that a handover is possible, a handover response command for causing the handover control apparatus to perform the handover And a command
  • a handover control method enables a voice call or a video call between a first network communication network and a second network communication network having a common service area with the first network communication network.
  • a handover control method for transmitting a request for handover of a mobile terminal to a handover determination device, wherein the radio quality information is received for the radio quality information transmitted by the mobile terminal residing in the first network communication network.
  • a handover request transmission step for transmitting a handover request for continuing a call by handing over to a network communication network to the handover determination device; and a response from the handover determination device to the handover request transmitted by the handover request transmission step.
  • a command receiving step for receiving an incoming handover response command, and a handover response step for sending a handover instruction for causing the mobile terminal to execute the handover when the command receiving step receives the handover response command for causing the handover to be performed
  • a handover rejection step of not transmitting the handover instruction to the mobile terminal when the command reception step receives a handover rejection command for preventing the handover from being performed, and
  • the command reception step receives a handover suppression command for suppressing transmission of the handover request
  • the handover request transmission step is not operated, and the command reception step cancels suppression of transmission of the handover request.
  • a handover request transmission restriction step of operating the handover request transmission step when a suppression release command is received.
  • the state of the mobile terminal call, the mobile terminal information indicating whether handover is possible even when the mobile terminal call state is ringing, and whether the handover is possible are determined. Since the handover can be controlled based on the command from the handover determination device to be performed and the transmission of the handover request can be suppressed based on the command from the handover determination device during the period when the handover cannot be performed, the call state corresponds to the SRVCC regulation. In this case, it is possible to prevent call disconnection of the mobile terminal due to handover of the mobile terminal in the absence of the mobile terminal and state mismatch between the mobile terminal and the IMS network, and further suppress transmission of an unnecessary handover request. Can reduce wasted traffic between base station equipment and IMS network Kill.
  • a handover determination program enables a voice call or a video call between a first network communication network and a second network communication network having a common service area with the first network communication network.
  • a handover determination program for receiving a request for handover of a mobile terminal from a handover control device, wherein the wireless quality of the mobile terminal is degraded during a voice call or a video call over the first network communication network.
  • Handover received from A reception request step a call state acquisition step of acquiring a call state of the mobile terminal when the handover request reception step receives the handover request or a request based on the handover request, and the mobile terminal
  • a mobile terminal information acquisition step of acquiring mobile terminal information including information on whether or not the mobile terminal is capable of handover in a call state; the call state acquired in the call state acquisition step; and Based on the mobile terminal information acquired in the mobile terminal information acquisition step, if the mobile terminal is not capable of handover in the call state, it is determined that handover is not possible, and the handover is not performed in the call state.
  • a handover determination step for determining that handover is possible When the handover determination step determines that handover is not possible, a handover rejection command for not causing the handover control apparatus to perform the handover is transmitted, and when the handover determination step determines that handover is possible, the handover control apparatus And a command transmission step of transmitting a handover response command for performing the handover.
  • this configuration it is possible to determine whether or not handover can be performed based on the call state of the mobile terminal and the mobile terminal information indicating whether or not handover is possible in the call state of the mobile terminal. , It is possible to prevent call disconnection of the mobile terminal due to handover of the mobile terminal when the call state does not comply with the SRVCC regulation and state mismatch between the mobile terminal and the IMS network. .
  • a handover control program enables a voice call or a video call between a first network communication network and a second network communication network having a common service area with the first network communication network.
  • a handover control program for transmitting a request for handover of a mobile terminal to a handover determination device, wherein the computer receives radio quality information transmitted by the mobile terminal residing in the first network communication network
  • the mobile terminal is A handover request transmission step for transmitting a handover request for continuing a call by handover from the first network communication network to the second network communication network, and the handover request transmission step transmitted by the handover request transmission step.
  • the command reception step does not operate the handover request transmission step.
  • a handover suppression release command for canceling suppression of transmission of the handover request is received, a handover request transmission restriction step for operating the handover request transmission step is executed.
  • the state of the mobile terminal call, the mobile terminal information indicating whether handover is possible even when the mobile terminal call state is ringing, and whether the handover is possible are determined. Since the handover can be controlled based on the command from the handover determination device to be performed and the transmission of the handover request can be suppressed based on the command from the handover determination device during the period when the handover cannot be performed, the call state corresponds to the SRVCC regulation. In this case, it is possible to prevent call disconnection of the mobile terminal due to handover of the mobile terminal in the absence of the mobile terminal and state mismatch between the mobile terminal and the IMS network, and further suppress transmission of an unnecessary handover request. Can reduce wasted traffic between base station equipment and IMS network Kill.
  • the call status of the mobile terminal the mobile terminal information indicating whether or not handover is possible in the call status of the mobile terminal, and the handover determination device for determining whether or not the handover is possible
  • the handover can be controlled based on the command from the mobile station, and the transmission of the handover request can be suppressed based on the command from the handover determination device during the period when the handover is not possible. It is possible to prevent call disconnection of the mobile terminal due to handover of the terminal and state mismatch between the mobile terminal and the IMS network, and further, by suppressing transmission of unnecessary handover requests, the base station Wasteful traffic between the device and the IMS network can be reduced.
  • 4 is a flowchart showing an operation of a handover determination unit of the handover determination apparatus according to the first embodiment of the present invention.
  • 3 is a flowchart showing the operation of the handover control apparatus according to the first embodiment of the present invention. It is a sequence diagram which shows operation
  • FIG. 1 is a configuration diagram illustrating configurations of a handover determination device 200 and a handover control device 100 according to the first embodiment.
  • a mobile terminal (UE: User Equipment) 30 is a service common to the LTE (Long Term Evolution) network 10 which is a first network communication network and the first network communication network.
  • a voice call or a video call can be made with a 3G (3rd generation, third generation mobile communication system) network 20 which is a second network communication network having an area.
  • the LTE network 10 includes a base station device (eNB: eNodeB) 40, an MME (Mobile Management Entity) 42, an MSC (Multimedia Switching Center) Server 44, and an IMS (IP Multimedia Subsystem) network (IMS NW) 50 shown in FIG. Is included.
  • the 3G network 20 includes a 3G network (3G NW) 60.
  • FIG. 1B shows the relationship between the current service area of the LTE network 10 and the service area of the 3G network 20. As shown in FIG. 1B, the service area of the LTE network 10 is common to the service area of the 3G network 20 and is narrower than the service area of the 3G network 20.
  • the base station device 40 includes a handover control apparatus 100.
  • the IMS network 50 includes a handover determination device 200, a call control device 70 including a S-CSCF (Serving Call Session Control Function) and a P-CSCF (Proxy Call Session Control Function), and a home subscriber server (HSS: Mobile terminal information management device 80 configured by Home Subscriber Server) and the like.
  • the handover control apparatus 100 includes a radio quality information receiving unit 110, a radio quality determination unit 120, a handover request transmission unit 130, a command reception unit 140, a handover response unit 150, and a handover rejection unit 160.
  • the handover determination apparatus 200 includes a handover request reception unit 210, a call state acquisition unit 220, a mobile terminal information acquisition unit 230, a handover determination unit 240, and a command transmission unit 250.
  • the mobile terminal 30 includes a radio network quality information 32 included in the base station device 40 when the radio quality value in the LTE network 10 is lower than the radio quality threshold specified by the base station device 40. 100 wireless quality information receivers 110.
  • the radio quality determination unit 120 determines whether the radio quality of the mobile terminal 30 has deteriorated based on the radio quality information 32 received by the radio quality information reception unit 110.
  • the handover request transmission unit 130 transmits a handover request 132 for handing over the mobile terminal 30 from the LTE network 10 to the 3G network 20 to the MME 42.
  • the MME 42 transmits the SRVCC request to the handover request receiving unit 210 of the handover determination device 200 included in the IMS network 50 via the MSC Server 44.
  • the handover request receiver 210 of the handover determination device 200 receives an SRVCC request based on the handover request 132 transmitted from the handover request transmitter 130.
  • the call state acquisition unit 220 acquires the call state of the mobile terminal 30 from the call control device 70 that monitors the call state of the mobile terminal 30. Examples of the call state include a calling state, a ringing state, an incoming call state, a call state, and an interrupt call state.
  • the calling state is a state immediately after the mobile terminal 30 starts sending.
  • the in-calling state is a state in which the calling party mobile terminal 30 is calling the other party after the calling state and before the originating mobile terminal 30 establishes communication with the other party mobile terminal.
  • the calling state is a state in which a call is made until the called terminal receives an incoming call and responds to the incoming call.
  • the incoming call state is a state before the incoming mobile terminal receives an incoming call and before calling.
  • the in-call state is a state in which a voice call or a video call can be made with a partner mobile terminal.
  • An interrupt call state is a state in which a call can be made with another mobile terminal that has been received later while the call with the other party's mobile terminal is on hold (interrupt call). For example, “Catch Phone” (referred to as a call using a service registered by Nippon Telegraph and Telephone Corporation).
  • the mobile terminal information acquisition unit 230 is a mobile terminal having an aSRVCC (alerting SRVCC) -compatible mobile terminal capable of performing handover even when the mobile terminal 30 is in a ringing state (that is, a mobile terminal having aSRVCC function).
  • Mobile terminal information is acquired from the mobile terminal information management device 80.
  • the mobile terminal information acquisition unit 230 is a bSRVCC (SRVCC before ringing) compatible mobile device that can perform handover even when the mobile terminal 30 is in a guidance state that is transmitted in a state before the call is established.
  • the mobile terminal information is acquired from the mobile terminal information management device 80 as to whether or not the terminal is a terminal (that is, a mobile terminal having a bSRVCC function).
  • the handover determination unit 240 determines whether or not handover is possible based on the call state of the mobile terminal 30 acquired by the call state acquisition unit 220 and the mobile terminal information acquired by the mobile terminal information acquisition unit 230. .
  • the command transmission unit 250 transmits an SRVCC response for causing the handover control apparatus 100 to perform the handover to the MME 42 via the MSC Server 44.
  • the MME 42 transmits a handover response command 252 based on the SRVCC response to the command receiving unit 140 of the handover control apparatus 100.
  • the command transmission unit 250 transmits an SRVCC rejection for preventing the handover control apparatus 100 from performing the handover to the MME 42 via the MSC Server 44.
  • the MME 42 transmits a handover rejection command 262 based on the SRVCC rejection to the command receiving unit 140 of the handover control apparatus 100.
  • the command reception unit 140 of the handover control apparatus 100 receives the handover response command 252 and the handover rejection command 262 that are transmitted by the command transmission unit 250 of the handover determination apparatus 200. If the command received by the command receiver 140 includes the handover response command 252, the handover response unit 150 transmits a handover instruction 152 for causing the mobile terminal 30 to execute the handover. The handover rejection unit 160 does not transmit the handover instruction 152 to the mobile terminal 30 when the handover rejection command 262 is included in the command received by the command reception unit 140.
  • FIG. 2 is a flowchart showing the operation of the handover determination apparatus 200 according to the first embodiment.
  • the SRVCC specified in Release 9 of Non-Patent Document 3 and the aSRVCC compatible terminal specified in Release 10 of Non-Patent Documents 3 and 4 are capable of handover even when the call state is ringing.
  • a case will be described in which a certain mobile terminal 30 acquires a voice call (performs a voice call) and determines whether or not handover is possible based on the state of the voice call and mobile terminal information. As shown in FIG.
  • step S202 the handover request reception unit 210 waits until it receives an SRVCC request based on the handover request 132 transmitted from the handover request transmission unit 130, and sends an SRVCC request based on the handover request 132. If received, the process proceeds to step S204.
  • step S204 the mobile terminal information acquisition unit 230 displays mobile terminal information indicating whether or not the mobile terminal 30 is an aSRVCC compatible terminal that can be handed over even when the voice call state is ringing. Obtained from the machine information management device 80. Thereafter, the process proceeds to step S206. If the mobile terminal information acquisition unit 230 has already acquired the mobile terminal information of the mobile terminal 30 from the mobile terminal information management device 80, the process of step S204 may not be performed.
  • the mobile terminal information acquisition unit 230 may determine whether the mobile terminal 30 is a terminal that can be handed over even when the voice call is in an incoming call state, and whether the voice call status is You may make it acquire from the mobile terminal information management apparatus 80 the mobile terminal information of whether it is a terminal which can be handed over in the state in the middle of transmission.
  • step S206 the call state acquisition unit 220 displays the state of the voice call of the mobile terminal 30 (calling / calling / incoming / calling / interrupt call etc.) and the state of the voice call of the mobile terminal 30. Obtained from the monitored call control device 70. Thereafter, the process proceeds to step S208. Even if the order of step S204 and step S206 is reversed (that is, when the handover request 132 is received in step S202, the process proceeds to step S206, proceeds to step S204, and proceeds to step S208). Also) In step S208, the handover determination unit 240 is executed. Thereafter, the process proceeds to step S210.
  • step S210 when the handover determining unit 240 determines that a handover is possible, the process proceeds to step S212. On the other hand, when the handover determining unit 240 determines that the handover is not possible in step S210, the process proceeds to step S214.
  • step S212 by executing the command transmission unit 250, an SRVCC response for performing the handover is transmitted to the MME 42 via the MSC Server 44.
  • the MME 42 transmits a handover response command 252 based on the SRVCC response to the command receiving unit 140 of the handover control apparatus 100. Thereafter, the process proceeds to step S202.
  • step S214 by executing the command transmission unit 250, an SRVCC rejection not to perform the handover is transmitted to the MME 42 via the MSC Server 44.
  • the MME 42 transmits a handover rejection command 262 based on the SRVCC rejection to the command receiving unit 140 of the handover control apparatus 100. Thereafter, the process proceeds to step S202.
  • FIG. 3 is a flowchart showing the operation of the handover determination unit 240.
  • the mobile terminal 30 acquires a voice call (performs a voice call) and determines whether or not handover is possible based on the voice call state and the mobile terminal information.
  • step S242 whether the state of the voice call of the mobile terminal 30 is an outgoing call state, an incoming call state, a ringing state, a busy state, or an interrupted call state.
  • step S246 It is determined in which state, and if the voice call state of the mobile terminal 30 is the outgoing call state, the process proceeds to step S246.
  • step S242 if the state of the voice call of the mobile terminal 30 is an incoming call state, the process proceeds to step S246.
  • step S242 if the voice call state of the mobile terminal 30 is a ringing state, the process proceeds to step S244.
  • step S242 if the voice call state of the mobile terminal 30 is a busy state, the process proceeds to step S248.
  • step S24248 if the state of the voice call of the mobile terminal 30 is an interrupt call state, the process proceeds to step S248.
  • step S244 it is determined whether or not the mobile terminal information of the mobile terminal 30 is an aSRVCC compatible terminal capable of performing handover even when the voice call state is ringing.
  • the process proceeds to step S248.
  • step S244 it is determined that the handover is not possible, and the process of the handover determination unit 240 ends.
  • step S248 it is determined that the handover is possible, and the processing of the handover determination unit 240 is terminated.
  • FIG. 3A it has been described that it is determined whether or not the terminal is an aSRVCC compatible terminal capable of performing handover even in the ringing state. However, as shown in FIG. It may be determined whether or not the terminal is capable of receiving (step S250), or it may be determined whether or not the terminal is capable of SRVCC even in the outgoing call state (step S252).
  • FIG. 4 is a flowchart showing the operation of the handover control apparatus 100 according to the first embodiment.
  • the wireless quality information receiving unit 110 waits until it receives the wireless quality information 32, and when it is received, the process proceeds to step S104.
  • the radio quality determination unit 120 determines whether or not the mobile terminal 30 needs to be handed over based on the radio quality information 32. If necessary, the radio quality determination unit 120 proceeds to step S106. On the other hand, if there is no need for handover in step S104, the process proceeds to step S102.
  • step S106 the handover request transmitter 130 transmits the handover request 132 to the MME 42.
  • the MME 42 transmits the SRVCC request to the handover request receiving unit 210 via the MSC Server 44.
  • Step S108 the process waits until the command receiving unit 140 receives a command. When the command is received, the process proceeds to step S110.
  • step S110 it is determined whether the command received by the command receiver 140 is a handover response command 252. If the command is a handover response command 252, the process proceeds to step S112. On the other hand, if it is not the handover response command 252 (that is, the handover rejection command 262) in step S110, the process proceeds to step S114. In step S112, the handover response unit 150 is executed, and a handover instruction 152 is transmitted to the mobile terminal 30. Thereafter, the process proceeds to step S102. Meanwhile, in step S114, the handover rejection unit 160 is executed, and the handover instruction 152 for causing the mobile terminal 30 to perform the handover is not transmitted. Thereafter, the process proceeds to step S102.
  • FIG. 5 is a sequence diagram illustrating operations of the handover determination device 200 and the handover control device 100 according to the first embodiment.
  • the mobile terminal 30 acquires a voice call (performs a voice call) and determines whether or not handover is possible based on the voice call state and the mobile terminal information.
  • the mobile terminal 30 is an aSRVCC compatible mobile terminal that can be handed over even when the voice call is ringing, and is located near the boundary of the LTE network 10 service area and within the 3G network 20 service area. (Refer FIG. 1 (B)), it demonstrates as what is communicating with the base station apparatus 40 of the LTE network 10.
  • FIG. 5 the mobile terminal 30 is in a state (during outgoing) before a bearer for voice call is established at time t0.
  • a call for making a voice call with the counterpart mobile terminal is started.
  • the mobile terminal 30 transmits to the base station device 40 the wireless quality information 32 indicating that the current wireless quality is below the threshold value of the wireless quality specified by the base station device 40. .
  • the radio quality information receiving unit 110 of the handover control device 100 included in the base station device 40 receives the radio quality information 32 (step S102 in FIG. 4).
  • the radio quality determination unit 120 determines that the mobile terminal 30 needs to be handed over based on the radio quality information 32 (step S104 in FIG. 4).
  • the handover request transmission unit 130 transmits a handover request 132 to the MME 42.
  • the MME 42 transmits the SRVCC request to the handover request receiving unit 210 via the MSC Server 44 (Step S106 in FIG. 4).
  • the handover request receiving unit 210 receives an SRVCC request based on the handover request 132 (step S202 in FIG. 2).
  • the mobile terminal information acquisition unit 230 stores mobile terminal information indicating whether or not the mobile terminal 30 is an aSRVCC compatible terminal that can be handed over even when the voice call is ringing. 80 (step S204 in FIG. 2).
  • the call state acquisition unit 220 acquires that the state of the voice call of the mobile terminal 30 is a calling state (step S206 in FIG. 2).
  • the handover determination unit 240 determines that the handover is not possible because the voice call state of the mobile terminal 30 is the outgoing call state and the mobile terminal 30 is not at a timing corresponding to SRVCC (step S208 in FIG. 2). .
  • an SRVCC rejection for not performing the handover is transmitted to the MME 42 via the MSC Server 44.
  • the MME 42 transmits a handover rejection command 262 based on the SRVCC rejection to the command receiving unit 140 of the handover control apparatus 100 (step S214 in FIG. 2).
  • the handover control apparatus 100 executes the handover rejection unit 160 and does not transmit the handover instruction 152 for causing the mobile terminal 30 to perform the handover (step S114 in FIG. 4).
  • the state of the voice call of the mobile terminal 30 changes to the ringing state.
  • the mobile terminal 30 transmits to the base station device 40 the wireless quality information 32 indicating that the current wireless quality is still below the wireless quality threshold specified by the base station device 40.
  • the radio quality information receiving unit 110 of the handover control device 100 included in the base station device 40 receives the radio quality information 32 (step S102 in FIG. 4).
  • the radio quality determination unit 120 determines that the mobile terminal 30 needs to be handed over based on the radio quality information 32 (step S104 in FIG. 4).
  • the handover request transmission unit 130 transmits a handover request 132 to the MME 42.
  • the MME 42 transmits the SRVCC request to the handover request receiving unit 210 via the MSC Server 44 (Step S106 in FIG. 4).
  • the handover request receiving unit 210 receives the SRVCC request based on the handover request 132 (step S202 in FIG. 2).
  • the mobile terminal information acquisition unit 230 has already acquired mobile terminal information.
  • the call state acquisition unit 220 acquires that the voice call state of the mobile terminal 30 is a ringing state (step S206 in FIG. 2).
  • the handover determining unit 240 is an aSRVCC compatible terminal capable of performing handover even when the voice call state of the mobile terminal 30 is in the ringing state and the mobile terminal information of the mobile terminal 30 is in the ringing state of the voice call. Therefore, it is determined that handover is possible (step S208 in FIG. 2).
  • the SRVCC response is transmitted to the MME 42 via the MSC Server 44.
  • the MME 42 transmits a handover response command 252 based on the SRVCC response to the command receiving unit 140 of the handover control apparatus 100 (step S214 in FIG. 2).
  • the handover control apparatus 100 executes the handover response unit 150 and transmits a handover instruction 152 for causing the mobile terminal 30 to perform handover (step S112 in FIG. 4).
  • the mobile terminal 30 executes a handover.
  • the mobile terminal 30 is handed over from the LTE network 10 to the 3G network 20 (see FIG. 1B), and is switched to a busy state by the 3G network 60 at time t10. That is, it indicates that SRVCC has been operated.
  • the following effects can be obtained.
  • the first embodiment based on the call state of the mobile terminal 30 and the mobile terminal information indicating whether or not the mobile terminal 30 can be handed over even when the call state of the mobile terminal 30 is in the ringing state. Since it is possible to determine whether or not handover is possible, call disconnection of the mobile terminal 30 due to handover of the mobile terminal 30 in a call state that the mobile terminal does not support, and the mobile terminal 30 and the IMS A state mismatch with the network 50 can be prevented.
  • the mobile terminal 30 has been described as an aSRVCC compatible terminal capable of performing a handover even when the call state is ringing. However, the mobile terminal 30 is similarly described for an aSRVCC non-compatible terminal. it can.
  • the aSRVCC incompatible terminal in the first modification corresponds to SRVCC defined in Release 9 of Non-Patent Document 3, but is defined in Release 10 and later of Non-Patent Documents 3 and 4.
  • aSRVCC indicates a non-compatible terminal.
  • the configuration of the first modification will be described by replacing “calling” at time t ⁇ b> 4 with “voice call in progress”.
  • the handover determination unit 240 determines that the handover is possible because the state of the voice call of the mobile terminal 30 is a busy state (FIG. 2). Step S208). After time t7, it is the same as in the first embodiment.
  • the call state of the mobile terminal 30 has been described as one of a calling state, a ringing state, an incoming call state, a call state, or an interrupt call state. An intermediate state or a cutting state may be included.
  • the handover determining unit 240 may determine that the handover is not possible when the call state of the mobile terminal 30 is a guidance state or a disconnection state before the call is established.
  • guidance sent before the call is established for example, out-of-service talk when the destination mobile terminal is out of service area
  • It includes both guidance that is sent out for example, the nuisance call guidance that is sent out when an incoming call from a nuisance call is rejected.
  • the guidance for the answering machine service includes, for example, both guidance sent before the call is established and guidance sent after the call is established. Note that the operation when the guidance is transmitted in a state after the call is established can start a normal SRVCC as in the case of a call. For this reason, in the first modification, the busy state after the call is established is included in the busy state. Further, the in-guidance state after the call is established is not included in the busy state, and the handover determination unit 240 may determine that the handover is impossible as in the in-guidance state before the call is established. .
  • the first modification is an example of a case where the mobile terminal 30 is a terminal that does not support aSRVCC, and the state of the call of the mobile terminal 30 is in a guidance state or a disconnection state before the call is established.
  • the state the operation that the handover determining unit 240 determines that the handover is impossible is described as an example, but other operations other than the operation that determines that the handover is impossible may be defined.
  • How to define the operation of the mobile terminal 30 when the call state of the mobile terminal 30 is in a guidance state or a disconnection state before the call is established depends on the capability of the mobile terminal 30. It depends on the network implementation.
  • the mobile terminal 30 is described as an aSRVCC compatible terminal capable of performing handover even when the call state is ringing.
  • the mobile terminal 30 Although described as a non-compatible terminal, a bSRVCC compatible terminal can be similarly described.
  • the mobile terminal 30 will be described as a bSRVCC compatible terminal capable of performing handover even when the call state is in a guidance state that is transmitted in a state before the call is established.
  • the terminal corresponding to bSRVCC in the second modification refers to a terminal compatible with the above-described SRVCC and aSRVCC and bSRVCC defined in Release 12 and later of Non-Patent Documents 3 and 4.
  • the mobile terminal 30 is a bSRVCC compatible terminal, the same processing as at time t0 in FIG. In the in-guidance state before the call is established, the in-calling state, and the talking state (including the in-guidance state after the call is established), the same processing as at time t4 in FIG. 5 is performed.
  • the operation in the guidance state before the call is established can be activated as bSRVCC
  • the operation in the ringing state can be activated as aSRVCC
  • the busy state (guidance after the call is established)
  • the operation in the middle state can be started as SRVCC.
  • the configuration of the second modification will be described by replacing “calling” at time t4 with “guidance before call is established”.
  • the handover determining unit 240 can perform handover because the voice call state of the mobile terminal 30 is in the guidance state before the call is established. (Step S208 in FIG. 2).
  • the operation after determining that the handover is possible can be started as bSRVCC. After time t7, it is the same as in the first embodiment.
  • a disconnecting state may be included as a call state of the mobile terminal 30.
  • the bSRVCC-compatible mobile terminal 30 described in the second modification does not support handover in a disconnected state. For this reason, the handover determination unit 240 may determine that the handover is not possible when the call state of the mobile terminal 30 is in the disconnecting state.
  • the second modification is an example in which the mobile terminal 30 is a bSRVCC compatible terminal. When the mobile terminal 30 is in a disconnected state, the handover determining unit 240 cannot perform a handover.
  • the operation for determining that the handover is performed is described as an example, but other operations other than the operation for determining that the handover is not possible may be defined. Other operations of the mobile terminal 30 when the call state of the mobile terminal 30 is in the disconnecting state are the same as in the first modification.
  • a handover determination device 2000 and a handover control device 1000 according to the second embodiment replace the handover determination device 200 and the handover control device 100 in FIG.
  • the handover control apparatus 1000 is configured by further including a handover request transmission restriction unit 170 in the handover control apparatus 100 of FIG.
  • the handover determination device 2000 is configured by replacing the command transmission unit 250 of the handover determination device 200 of FIG.
  • the handover determination device 2000 and the handover control device 1000 further include a handover suppression command 272 and a handover suppression release command 282.
  • FIG. 6 is a configuration diagram illustrating configurations of the handover determination device 2000 and the handover control device 1000 according to the second embodiment.
  • the base station device 40 includes a handover control apparatus 1000.
  • the IMS network 50 includes a handover determination device 2000.
  • the handover control apparatus 1000 includes a radio quality information reception unit 110, a radio quality determination unit 120, a handover request transmission unit 130, a command reception unit 140, a handover response unit 150, a handover rejection unit 160, and a handover request transmission restriction. Part 170.
  • the handover determination device 2000 includes a handover request reception unit 210, a call state acquisition unit 220, a mobile terminal information acquisition unit 230, a handover determination unit 240, and a command transmission unit 2500.
  • the command transmission unit 2500 transmits an SRVCC response for causing the handover control apparatus 1000 to perform the handover to the MME 42 via the MSC Server 44.
  • the MME 42 transmits a handover response command 252 based on the SRVCC response to the command receiving unit 140 of the handover control apparatus 1000.
  • the command transmission unit 2500 transmits an SRVCC rejection for preventing the handover control apparatus 1000 from performing the handover to the MME 42 via the MSC Server 44.
  • the MME 42 transmits a handover rejection command 262 based on the SRVCC rejection to the command reception unit 140 of the handover control apparatus 1000.
  • the command transmission unit 2500 transmits SRVCC suppression for the handover control apparatus 1000 to suppress transmission of the handover request 132 to the MME 42 via the MSC Server 44.
  • the MME 42 adds a handover suppression command 272 based on SRVCC suppression to the handover rejection command 262 and transmits it to the command receiving unit 140 of the handover control apparatus 1000.
  • the command transmission unit 2500 transmits the handover suppression command 272 to the handover control apparatus 1000
  • the command transmission unit 2500 waits until the determination of the handover determination unit 240 transitions to enable handover.
  • the handover control apparatus 1000 transmits to the MME 42 via the MSC Server 44 the SRVCC suppression release for canceling the suppression of transmission of the handover request.
  • the MME 42 transmits a handover suppression cancellation command 282 based on the SRVCC suppression cancellation to the command reception unit 140 of the handover control apparatus 1000.
  • the command reception unit 140 of the handover control apparatus 1000 includes a handover response command 252, a handover rejection command 262, a handover suppression command 272, a handover suppression release command 282, which are transmitted from the command transmission unit 2500 of the handover determination apparatus 2000. Receive.
  • the handover request transmission restriction unit 170 does not operate the handover request transmission unit 130 when the command received by the command reception unit 140 includes the handover suppression command 272. Further, when the command received by the command receiving unit 140 includes the handover suppression release command 282, the handover request transmission limiting unit 170 operates the handover request transmitting unit 130.
  • FIG. 7 is a flowchart showing the operation of the handover determination device 2000 according to the second embodiment.
  • the mobile terminal 30 which is an aSRVCC compatible terminal capable of handover even when the SRVCC and the call state are ringing acquires a voice call (performs a voice call), and the voice call state and the mobile terminal A case where it is determined whether or not handover is possible based on the machine information will be described. As shown in FIG.
  • step S2002 the handover request receiving unit 210 waits until it receives an SRVCC request based on the handover request 132 transmitted from the handover request transmitting unit 130, and the SRVCC request based on the handover request 132 is received. Is received, the process proceeds to step S2004.
  • step S2004 the mobile terminal information acquisition unit 230 displays the mobile terminal information indicating whether or not the mobile terminal 30 is an aSRVCC compatible terminal capable of performing handover even when the voice call state is ringing. Obtained from the machine information management device 80. Thereafter, the process proceeds to step S2006. If the mobile terminal information acquisition unit 230 has already acquired the mobile terminal information of the mobile terminal 30 from the mobile terminal information management device 80, the process of step S2004 may not be performed.
  • step S2006 the call state acquisition unit 220 is in a state where the voice call of the mobile terminal 30 is in a calling state, a ringing state, an incoming state, a call state, or an interrupt call state. Is obtained from the call control device 70 that monitors the state of the voice call of the mobile terminal 30. Thereafter, the process proceeds to step S2008.
  • step S2008 the handover determination unit 240 is executed. Thereafter, the process proceeds to step S2010.
  • step S2010 if the handover determining unit 240 determines that a handover is possible, the process proceeds to step S2012.
  • step S2014 when the handover determination unit 240 determines that the handover is not possible in step S2010, the process proceeds to step S2014.
  • step S2012 by executing the command transmission unit 2500, an SRVCC response is transmitted to the MME 42 via the MSC Server 44.
  • the MME 42 transmits a handover response command 252 based on the SRVCC response to the command receiving unit 140 of the handover control apparatus 1000. Thereafter, the process proceeds to step S2002.
  • step S2014 by executing the command transmission unit 2500, the SRVCC rejection is transmitted to the MME 42 via the MSC Server 44.
  • the MME 42 transmits a handover rejection command 262 based on the SRVCC rejection to the command reception unit 140 of the handover control apparatus 1000.
  • step S2016 the command transmission unit 2500 is executed to transmit the SRVCC suppression to the MME 42 via the MSC Server 44.
  • the MME 42 transmits a handover suppression command 272 based on SRVCC suppression to the command reception unit 140 of the handover control apparatus 1000.
  • step S2018 the process proceeds to step S2018.
  • step S ⁇ b> 2018 the call state acquisition unit 220 has a voice call state of the mobile terminal 30 in any of a calling state, a ringing state, a receiving state, a calling state, or an interrupting call state. Is obtained from the call control device 70 that monitors the state of the voice call of the mobile terminal 30. Thereafter, the process proceeds to step S2020. In step S2020, the handover determination unit 240 is executed. Thereafter, the process proceeds to step S2022.
  • step S2022 when the handover determining unit 240 determines that a handover is possible, the process proceeds to step S2024. On the other hand, when the handover determination unit 240 determines that the handover is not possible in step S2022, the process proceeds to step S2018.
  • step S2024 by executing the command transmission unit 2500, the SRVCC suppression release is transmitted to the MME 42 via the MSC Server 44. The MME 42 transmits a handover suppression cancellation command 282 based on the SRVCC suppression cancellation to the command reception unit 140 of the handover control apparatus 1000. Thereafter, the process proceeds to step S2002.
  • FIG. 8 is a flowchart showing the operation of the handover control apparatus 1000 according to the second embodiment.
  • the process waits until the wireless quality information receiving unit 110 receives the wireless quality information 32. If received, the process proceeds to step S1004.
  • the radio quality determination unit 120 determines whether the radio quality of the mobile terminal 30 is deteriorated based on the radio quality information 32. If the radio quality is deteriorated, the process proceeds to step S1006. . On the other hand, if the wireless quality is not degraded in step S1004, the process proceeds to step S1002.
  • step S1006 the handover request transmitter 130 transmits a handover request 132 to the MME 42.
  • the MME 42 transmits the SRVCC request to the handover request receiving unit 210 via the MSC Server 44.
  • step S1008 the process waits until the command receiving unit 140 receives a command.
  • step S1010 it is determined whether the command received by the command receiver 140 is a handover response command 252. If the command is a handover response command 252, the process proceeds to step S1012. On the other hand, if it is not the handover response command 252 in step S1010, the process proceeds to step S1014.
  • step S1012 the handover response unit 150 is executed, and a handover instruction 152 is transmitted to the mobile terminal 30. Thereafter, the process proceeds to step S1002.
  • step S1014 it is determined whether or not the command received by the command receiving unit 140 is a handover suppression command 272. If the command is the handover suppression command 272, the process proceeds to step S1008 (that is, the handover request transmitting unit 130 is operated). Don't let me) On the other hand, if it is not the handover inhibition command 272 in step S1014, the process proceeds to step S1016.
  • step S1016 it is determined whether or not the command received by the command receiver 140 is a handover suppression release command 282. If the command is a handover suppression release command 282, the process proceeds to step S1002 (that is, the handover request transmitter 130). To work). On the other hand, in step S1016, if it is not the handover suppression release command 282 (that is, the handover rejection command 262), the process proceeds to step S1018. Meanwhile, in step S1018, the handover rejection unit 160 is executed, and the handover instruction 152 for causing the mobile terminal 30 to perform the handover is not transmitted. Thereafter, the process proceeds to step S1002. Note that the operations in steps S1014 and S1016 are operations of the handover request transmission restriction unit 170.
  • FIG. 9 is a sequence diagram illustrating operations of the handover determination device 2000 and the handover control device 1000 according to the second embodiment.
  • the mobile terminal 30 is an aSRVCC compatible mobile terminal capable of performing handover even when the call state is ringing, and is assumed to be in the vicinity of the service area boundary of the LTE network 10 and within the service area of the 3G network 20 ( 1 (B)), it demonstrates as what is communicating with the base station apparatus 40 of the LTE network 10.
  • FIG. 9 the mobile terminal 30 is in a state (before transmission) before a bearer for a voice call is established at time t0.
  • the mobile terminal 30 acquires a voice call (performs a voice call) and determines whether or not handover is possible based on the voice call state and the mobile terminal information.
  • a call for making a voice call with the partner mobile terminal is started. It is assumed that a user having a mobile terminal 30 moves from the LTE network 10 to the vicinity of the service area of the 3G network 20 (see FIG. 1B) while starting transmission. Since the mobile terminal 30 has moved to the vicinity of the end of the LTE network 10, the radio quality from the LTE network 10 deteriorates. Therefore, the mobile terminal 30 transmits to the base station device 40 the wireless quality information 32 indicating that the current wireless quality has fallen below the threshold value of the wireless quality specified by the base station device 40 at time t1.
  • the radio quality information receiving unit 110 of the handover control apparatus 1000 included in the base station device 40 receives the radio quality information 32 (step S1002 in FIG. 8).
  • the wireless quality determination unit 120 determines that the wireless quality of the mobile terminal 30 has deteriorated based on the wireless quality information 32 (step S1004 in FIG. 8).
  • the handover request transmission unit 130 transmits a handover request 132 to the MME 42.
  • the MME 42 transmits the SRVCC request to the handover request receiving unit 210 via the MSC Server 44 (Step S1006 in FIG. 8).
  • the handover request receiving unit 210 receives the SRVCC request based on the handover request 132 (step S2002 in FIG. 7).
  • the mobile terminal information acquisition unit 230 stores mobile terminal information indicating whether or not the mobile terminal 30 is an aSRVCC compatible terminal that can be handed over even when the voice call is ringing. 80 (step S2004 in FIG. 7).
  • the call state acquisition unit 220 acquires that the voice call state of the mobile terminal 30 is a calling state (step S2006 in FIG. 7).
  • the handover determination unit 240 determines that the handover is not possible because the voice call state of the mobile terminal 30 is a calling state (step S2008 in FIG. 7).
  • the SRVCC rejection is transmitted to the MME 42 via the MSC Server 44 by executing the command transmission unit 2500.
  • the MME 42 transmits a handover rejection command 262 based on the SRVCC rejection to the command receiving unit 140 of the handover control apparatus 1000 (step S2014 in FIG. 7).
  • the SRVCC suppression is transmitted to the MME 42 via the MSC Server 44.
  • the MME 42 transmits a handover suppression command 272 based on SRVCC suppression to the command receiving unit 140 of the handover control apparatus 1000 (step S2016 in FIG. 7).
  • the handover determination device 2000 transmits a handover suppression command 272 via SRVCC suppression, then monitors the voice call state of the mobile terminal 30 by the call state acquisition unit 220 and waits until the handover determination unit 240 determines that the handover is possible. (Steps S2018 to S2022 in FIG. 7).
  • the handover control apparatus 1000 Since the handover control apparatus 1000 has received the handover suppression command 272 (step S1014 in FIG. 8), the handover control apparatus 1000 waits until it receives a command (handover suppression cancellation command 282) from the handover determination apparatus 2000 (step S1008 in FIG. 8). Next, at time t ⁇ b> 4, the mobile terminal 30 transmits to the base station device 40 the wireless quality information 32 indicating that the current wireless quality is below the wireless quality threshold specified by the base station device 40. However, since the handover request transmission unit 130 does not operate until the handover control apparatus 1000 receives a command (handover suppression release command 282) from the handover determination apparatus 2000, transmission of the handover request 132 is suppressed.
  • the state of the voice call of the mobile terminal 30 changes to the ringing state.
  • the handover determination device 2000 determines that the handover determination unit 240 can perform the handover because the voice call state of the mobile terminal 30 has changed to the ringing state (step S2022 in FIG. 7).
  • the handover determination device 2000 transmits SRVCC suppression release to the MME 42 via the MSC Server 44.
  • the MME 42 transmits a handover suppression cancellation command 282 based on the SRVCC suppression cancellation to the command reception unit 140 of the handover control apparatus 1000 (step S2024 in FIG. 7). Since the handover control apparatus 1000 receives the handover suppression release command 282 (step S1016 in FIG. 8), the handover request transmission unit 130 starts operating, and the suppression of transmission of the handover request 132 is released.
  • the mobile terminal 30 transmits to the base station device 40 the wireless quality information 32 indicating that the current wireless quality is below the wireless quality threshold specified by the base station device 40.
  • the radio quality information receiving unit 110 of the handover control apparatus 1000 receives the radio quality information 32 (step S1002 in FIG. 8).
  • the wireless quality determination unit 120 determines that the wireless quality of the mobile terminal 30 has deteriorated based on the wireless quality information 32 (step S1004 in FIG. 8).
  • the handover request transmitter 130 transmits a handover request 132 to the MME 42.
  • the MME 42 transmits the SRVCC request to the handover request receiving unit 210 via the MSC Server 44 (Step S1006 in FIG. 8).
  • the handover request receiving unit 210 receives an SRVCC request based on the handover request 132 (step S2002 in FIG. 7).
  • the call state acquisition unit 220 acquires that the voice call state of the mobile terminal 30 is a ringing state (step S2006 in FIG. 7).
  • the handover determination unit 240 determines that the handover is possible because the voice call state of the mobile terminal 30 is in the ringing state and the mobile terminal information of the mobile terminal 30 is an aSRVCC compatible terminal (step S2008 in FIG. 7). ).
  • the SRVCC response is transmitted to the MME 42 via the MSC Server 44.
  • the MME 42 transmits a handover response command 252 based on the SRVCC response to the command receiving unit 140 of the handover control apparatus 1000 (step S2012 in FIG. 7).
  • the handover control apparatus 100 executes the handover response unit 150 and transmits a handover instruction 152 for causing the mobile terminal 30 to perform handover (step S1012 in FIG. 8).
  • the mobile terminal 30 executes a handover.
  • the mobile terminal 30 has been handed over from the LTE network 10 to the 3G network 20 (see FIG. 1B), and has switched to a busy state by the 3G network 60 at time t12. That is, it indicates that SRVCC has been operated.
  • the mobile terminal information can be handed over with the call state of the mobile terminal, the mobile terminal information indicating whether or not the mobile terminal can be handed over even when the call state of the mobile terminal is ringing. It is possible to control handover based on a command from a handover determination device that determines whether or not, and during a period when handover is not possible, transmission of a handover request can be suppressed based on a command from the handover determination device.
  • the mobile terminal 30 is described as an aSRVCC compatible terminal capable of performing handover even when the call state is ringing. However, the mobile terminal 30 is similarly described for an aSRVCC non-compatible terminal. it can. Note that a terminal that does not support aSRVCC in the third modification indicates a terminal that supports SRVCC but does not support aSRVCC, as in the first modification.
  • the mobile terminal 30 is a terminal that does not support aSRVCC, the same processing as that at time t0 in FIG. 9 is performed in the calling state and the calling state. In a busy state (including a busy state after the call is established), the same processing as at time t5 in FIG. 9 is performed.
  • the configuration of the third modification will be described by replacing “calling” at time t5 with “voice call in progress”.
  • the handover determining unit 240 determines that the handover is possible because the state of the voice call of the mobile terminal 30 is a busy state (FIG. 7).
  • Step S2008 the process is the same as in the second embodiment.
  • the state of the voice call of the mobile terminal 30 has been described as one of a calling state, a ringing state, an incoming call state, a call state, or an interrupt call state, but this has led to a voice guidance. A state during guidance or a state during disconnection may be included.
  • the handover determining unit 240 may determine that the handover is not possible when the call state of the mobile terminal 30 is a guidance state or a disconnection state before the call is established.
  • other operations than the operation in which the handover determining unit 240 determines that the handover is impossible may be defined.
  • the mobile terminal 30 is described as an aSRVCC compatible terminal capable of performing handover even when the call state is ringing.
  • the mobile terminal 30 Although described as a non-compatible terminal, a bSRVCC compatible terminal can be similarly described.
  • the mobile terminal 30 will be described as a bSRVCC compatible terminal capable of performing handover even when the call state is in a guidance state that is transmitted in a state before the call is established.
  • the terminal corresponding to bSRVCC in Modification 4 refers to a terminal compatible with SRVCC, aSRVCC, and bSRVCC.
  • the mobile terminal 30 is a bSRVCC compatible terminal, the same processing as at time t0 in FIG. In the in-guidance state before the call is established, the in-calling state, and the in-call state (including the in-guidance state after the call is established), processing similar to that at time t5 in FIG. 9 is performed.
  • the operation in the guidance state before the call is established can be activated as bSRVCC
  • the operation in the ringing state can be activated as aSRVCC
  • the busy state (guidance after the call is established)
  • the operation in the middle state can be started as SRVCC.
  • the configuration of Modification 4 will be described by replacing “calling” at time t ⁇ b> 5 with “guidance before the call is established”.
  • the handover determination unit 240 can perform handover because the voice call state of the mobile terminal 30 is in the guidance state before the call is established. (Step S2008 in FIG. 7). After time t8, the process is the same as in the second embodiment.
  • the handover determination apparatus described above employs the following handover determination method. In other words, a request for handing over a mobile terminal capable of voice or video call between the first network communication network and the second network communication network having a common service area with the first network communication network is handed over.
  • a handover determination method received from a control device comprising: detecting a deterioration in radio quality of the mobile terminal during a voice call or video call in the first network communication network; A handover request receiving step of receiving a handover request or a request based on the handover request for handover from the first network communication network to the second network communication network to continue the call, and the handover request
  • the reception process is the handover request
  • a call state acquisition step of acquiring a call state of the mobile terminal, and the mobile terminal is a mobile terminal capable of the handover in the call state.
  • a mobile terminal information acquisition step for acquiring mobile terminal information including information on whether or not there is, a call state acquired by the call state acquisition step, and the mobile terminal acquired by the mobile terminal information acquisition step Based on the information, if the mobile terminal is not capable of the handover in the call state, it is determined that the handover is not possible. If the mobile terminal is capable of the handover in the call state, the handover is possible.
  • the handover control apparatus A command transmission step for transmitting a handover response command for causing the handover control device to execute the handover when the handover determination step determines that handover is possible, Including handover determination method is adopted.
  • a handover suppression command for causing the handover control apparatus to suppress transmission of the handover request is sent to the handover determination method.
  • the handover suppression release command may be transmitted.
  • the handover control apparatus described above employs the following handover control method.
  • a request for handing over a mobile terminal capable of voice or video call between the first network communication network and the second network communication network having a common service area with the first network communication network is handed over.
  • a handover control method for transmitting to a determination device comprising: a radio quality information receiving step for receiving radio quality information transmitted by the mobile terminal residing in the first network communication network; and the radio quality information
  • a wireless quality determination step for determining whether or not the wireless quality of the mobile terminal in the first network communication network is deteriorated, and the wireless quality determination step determines that the wireless quality of the mobile terminal has deteriorated
  • the mobile terminal is handed over from the first network communication network to the second network communication network.
  • a handover reject step that does not transmit the handover instruction to the mobile terminal, and the command reception step includes the handover request
  • the handover request transmission step is not operated, and when the command reception step receives a handover suppression cancellation command for canceling suppression of transmission of the handover request
  • a handover control method including a handover request transmission restriction step for operating the handover request transmission step is employed.
  • ⁇ Handover determination program> when implementing the above-described handover determination device by executing a program in the IMS network, the following program can be used.
  • a request for handing over a mobile terminal capable of voice or video call between the first network communication network and the second network communication network having a common service area with the first network communication network is handed over.
  • a handover request receiving step for receiving a handover request or a request based on the handover request for continuing a call by handing over a network from the first network communication network to the second network communication network; Receiving the handover request
  • a call state acquisition step of acquiring a call state of the mobile terminal, and the mobile terminal can perform the handover in the call state
  • a mobile terminal information acquisition step for acquiring mobile terminal information including information as to whether or not the terminal is a mobile terminal, the call state acquired by the call state acquisition step, and the mobile terminal information acquisition step Based on the mobile terminal information, if the mobile terminal is not capable of handover in the call state, it is determined that handover is not possible, and if the mobile terminal is capable of handover in the call state
  • a handover determination step for determining that a handover is possible, and the handover determination step includes a handover If it is determined that the handover is possible, a handover rejection command for not causing the handover controller to perform the
  • a handover suppression command for causing the handover control device to suppress transmission of the handover request is added to the handover rejection command.
  • a handover suppression release command for causing the handover control device to cancel suppression of transmission of the handover request. You may make it transmit.
  • ⁇ Handover control program> when the above-described handover control apparatus is realized by executing a program in a base station device, the following program can be used. In other words, a request for handing over a mobile terminal capable of voice or video call between the first network communication network and the second network communication network having a common service area with the first network communication network is handed over.
  • a handover control program to be transmitted to a determination device comprising: a radio quality information receiving step for receiving, on a computer, radio quality information transmitted by the mobile terminal located in the first network communication network; A radio quality determination step for determining whether or not the radio quality of the mobile terminal in the first network communication network is deteriorated based on quality information, and the radio quality determination step is a deterioration of the radio quality of the mobile terminal If it is determined that the mobile terminal is not connected to the second network from the first network communication network.
  • a handover request transmission step for transmitting a handover request for continuing a call by handing over to a network communication network to the handover determination device; and a response from the handover determination device to the handover request transmitted by the handover request transmission step.
  • the command receiving step receives a handover rejection command for preventing the handover from being performed, a handover request that does not transmit the handover instruction to the mobile terminal is received.
  • the handover rejection command for suppressing the transmission of the handover request is received by the command rejection step and the command reception step, the handover request transmission step is not operated, and the command reception step suppresses the transmission of the handover request.
  • a handover control program for executing a handover request transmission restriction step for operating the handover request transmission step when a handover suppression release command for canceling is received can be used.
  • the present invention prevents call disconnection of a mobile terminal due to handover of the mobile terminal when the call state does not comply with the SRVCC specification and state mismatch between the mobile terminal and the IMS network. In addition, it can be used when unnecessary traffic between the base station device and the IMS network is reduced by suppressing transmission of unnecessary handover requests.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention porte sur un dispositif de détermination de transfert et un dispositif de commande de transfert qui préviennent un défaut de concordance d'état, une déconnexion d'appel et analogue entre un équipement utilisateur (UE) et un réseau IMS en raison de l'exécution d'un transfert dans l'état dans lequel SRVCC n'est pas prise en charge. Un équipement utilisateur (30) apte à effectuer une conversation téléphonique par conversation vocale ou conversation vidéo par l'intermédiaire d'un réseau de communication (10) et d'un réseau de communication (20) comprend : une unité de réception de requête de transfert (210) qui reçoit une requête de transfert (132) qui demande le transfert de la conversation téléphonique du réseau de communication (10) au réseau de communication (20) ; une unité d'acquisition d'état d'appel (220) qui détecte un état d'appel de l'équipement utilisateur (30) ; et une unité de transmission d'instruction (250) qui transmet, à un dispositif de commande de transfert (100), une instruction de rejet de transfert (262) pour que le dispositif de commande de transfert (100) amène l'équipement utilisateur (30) à ne pas exécuter le transfert sauf quand l'état d'appel est durant une conversation téléphonique.
PCT/JP2013/006104 2012-10-11 2013-10-11 Dispositif de détermination de transfert, dispositif de commande de transfert, procédé de détermination de transfert, procédé de commande de transfert, programme de détermination de transfert et programme de commande de transfert WO2014057691A1 (fr)

Priority Applications (1)

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JP2014540758A JP6063473B2 (ja) 2012-10-11 2013-10-11 ハンドオーバ判定装置、ハンドオーバ制御装置、ハンドオーバ判定方法、ハンドオーバ制御方法、ハンドオーバ判定プログラム、ハンドオーバ制御プログラム

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JP2012225596 2012-10-11

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CN106605429B (zh) * 2014-10-03 2020-06-19 苹果公司 用于管理电路交换回退呼叫的系统和方法
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