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WO2014050345A1 - Station de base radio source de transfert intercellulaire, station de base radio destination de transfert intercellulaire, système et procédé de radiocommunication - Google Patents

Station de base radio source de transfert intercellulaire, station de base radio destination de transfert intercellulaire, système et procédé de radiocommunication Download PDF

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Publication number
WO2014050345A1
WO2014050345A1 PCT/JP2013/071974 JP2013071974W WO2014050345A1 WO 2014050345 A1 WO2014050345 A1 WO 2014050345A1 JP 2013071974 W JP2013071974 W JP 2013071974W WO 2014050345 A1 WO2014050345 A1 WO 2014050345A1
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WIPO (PCT)
Prior art keywords
call
handover
base station
radio base
emergency
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2013/071974
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English (en)
Japanese (ja)
Inventor
優輔 佐々木
聖悟 原野
匠吾 矢葺
優 大▲高▼
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NTT Docomo Inc
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NTT Docomo Inc
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Filing date
Publication date
Application filed by NTT Docomo Inc filed Critical NTT Docomo Inc
Publication of WO2014050345A1 publication Critical patent/WO2014050345A1/fr
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Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/50—Connection management for emergency connections
    • 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
    • H04W36/34—Reselection control
    • H04W36/38—Reselection control by fixed network equipment

Definitions

  • the present invention relates to a handover source radio base station, a handover destination radio base station, a radio communication system, and a radio communication method.
  • LTE Long Term Evolution
  • VoIP Voice over LTE
  • the UE user equipment, User Equipment, mobile station
  • a bearer called (default bearer) is established, signaling is performed via the default bearer according to the SIP (Session Initiation Protocol) procedure, and then for voice communication called a dedicated bearer (dedicated bearer) Is established.
  • SIP Session Initiation Protocol
  • FIG. 1 is a schematic diagram showing various bearers established for a UE that can use VoLTE.
  • various bearers are established between an access point (AP) and a UE via an eNB (base station).
  • the access points include an access point for SP mode (smart phone mode), an IMS (IP Multimedia Subsystem) access point, and an IMS emergency call access point.
  • An SP mode access point is used for data communication
  • an IMS or IMS emergency call access point is used for voice data communication, that is, VoLTE.
  • VoLTE uses IMS.
  • a default bearer is first established between the UE and the IMS access point.
  • the default bearer is a bearer that is initially set between a certain UE and a certain access point.
  • SIP signaling is performed using the default bearer, and then a dedicated bearer is established between the UE and the IMS access point.
  • a dedicated bearer is a bearer set second or later between a certain UE and a certain access point. By establishing this dedicated bearer, voice data is communicated.
  • VoLTE emergency calls calls to police agencies, fire departments or emergency medical institutions
  • a default bearer is first established between the UE and the IMS emergency call access point.
  • SIP signaling is performed using the default bearer, and then a dedicated bearer is established between the UE and the IMS emergency call access point. By establishing this dedicated bearer, the voice data of the emergency call is communicated.
  • a default bearer is first established between the UE and IMS access points. Thereafter, a default bearer is established between the UE and the SP mode access point, and data is communicated via the default bearer.
  • Non-Patent Document 1 In LTE, general calls and priority calls are distinguished by information elements called Allocation and Retention Priority (ARP) (see Non-Patent Document 1). Sec. 9.2.31 of Non-Patent Document 1 describes that general calls and priority calls are identified using ARP. Specifically, if the priority level (Priority Level) included in the ARP is 15, the call is a general call, and if the priority level is 1 to 14, the call is a priority call. In addition, when data communication is transmitted in a state where a priority voice call bearer exists, 15 may be used as the priority level for the data communication call.
  • ARP Allocation and Retention Priority
  • ARP is sent with the following message attached.
  • S1-AP application protocol
  • S1-AP E-RAB Setup Request
  • S1-AP E-RAB Modify Request
  • S1-AP Handover Request
  • X2-AP Handover Request
  • Priority calls identified with ARP priority levels 1 to 14 are classified as priority user calls and emergency calls.
  • the priority user call is, for example, a call originated by an important subscriber's UE.
  • IMSI International Mobile Subscriber Identity
  • MME Mobility Management Entity, mobility management entity
  • the eNB and MME can distinguish between priority user calls and emergency calls.
  • priority user calls are always handled preferentially in the wireless communication network.
  • FIG. 2 is a sequence diagram showing a control procedure in the wireless communication network when a VoLTE general call is transmitted.
  • the UE and the eNB execute RRC Connection establishment processing Step1.
  • the UE sends an RRC Connection Request to the eNB
  • the eNB sends an RRC Connection Setup to the UE
  • the UE sends an RRC Connection Setup Complete to the eNB.
  • Step 2 voice default bearer establishment processing Step 2 is executed.
  • eNB sends InitialInUE Message to MME
  • MME sends Initial Context Setup Request to eNB
  • eNB sends Security ⁇ Mode Command and RRC Connection Reconfiguration to UE
  • UE sends Security Mode Complete and RRC to eNB Connection Reconfiguration Complete is sent
  • eNB sends Initial Context Setup Response to MME.
  • a default bearer is established between the UE and the IMS access point.
  • SIP procedure Step 3 is executed using the default bearer set between the UE and IMS access point. Further, the voice dedicated bearer establishment process Step 4 is executed.
  • MME sends E-RAB Setup Request to eNB
  • eNB sends RRC Connection Reconfiguration to UE
  • UE sends RRC Connection Reconfiguration Complete to eNB
  • eNB sends E-RAB Setup Response to MME To do.
  • a dedicated bearer is established between the access point of the UE and the IMS. Thereafter, voice communication by VoLTE is started (Step 5).
  • the Initial Context Setup Request that the MME sends to the eNB includes an information element ARP.
  • the priority level is set to 15 (that is, a general call). This is regardless of the fact that the actual call is a general call or an emergency call, and if the Initial UE Message that the eNB sends to the MME contains an information element called Service Request, the MME This is because it is specified to notify 15 to the eNB.
  • the E-RAB Setup Request that the MME sends to the eNB also includes the information element ARP, and the priority level is set to 15 (that is, a general call) even in this ARP. This is because the MME is specified to notify the eNB of the priority level 15 unless an emergency call is notified from the UE to the MME by NAS (Non-Access Stratum).
  • FIG. 3 is a sequence diagram showing a control procedure in the wireless communication network in sending an emergency call of VoLTE.
  • the UE and the eNB execute the RRC-Connection establishment process Step1 as in the control procedure of FIG.
  • voice default bearer establishment processing Step 2 is executed.
  • This voice default bearer establishment process Step2 is similar to the voice default bearer establishment process Step2 of FIG. 2, and a default bearer is established between the UE and the IMS access point.
  • priority level 15 (that is, general call) is set in the ARP included in the Initial Context Setup Request sent by the MME to the eNB in the voice default bearer establishment process Step2. This is regardless of the fact that the actual call is a general call or an emergency call, and if the Initial UE Message that the eNB sends to the MME contains an information element called Service Request, the MME This is because it is specified to notify 15 to the eNB.
  • the MME performs the Service Request procedure before connecting to the IMS emergency call access point.
  • the emergency call notification process Step 6 is executed.
  • the UE transmits UL Information Transfer to the eNB, and the eNB transmits Uplink NAS transfer to the MME.
  • UL Information Transfer and Uplink NAS Transfer are PDN Connectivity Request using NAS. In this way, the UE is notified that the call is an emergency call via the NAS.
  • the emergency voice default bearer establishment process Step7 is executed.
  • MME sends E-RAB Setup Request to eNB
  • eNB sends RRC Connection Reconfiguration to UE
  • UE sends RRC Connection Reconfiguration Complete to eNB
  • eNB sends E-RAB Setup Response to MME To do.
  • the priority level is set to other than 15 (that is, emergency call) in the information element ARP included in the E-RAB Setup Request transmitted from the MME to the eNB.
  • a default bearer is established between the UE and the IMS emergency call access point.
  • SIP procedure Step 8 is executed using the default bearer set between the UE and the IMS emergency call access point. Further, the emergency bear dedicated bearer establishment process Step 9 is executed.
  • MME sends E-RAB Setup Request to eNB
  • eNB sends RRC Connection Reconfiguration to UE
  • UE sends RRC Connection Reconfiguration Complete to eNB
  • eNB sends E-RAB Setup Response to MME To do.
  • the emergency voice dedicated bearer establishment process Step 9 the priority level is set to other than 15 (that is, emergency call) in the information element ARP included in the E-RAB Setup Request transmitted from the MME to the eNB.
  • the emergency voice dedicated bearer establishment process Step 9 a dedicated bearer is established between the UE and the IMS emergency call access point. Thereafter, voice communication by VoLTE is started (Step 10).
  • GPRS General Packet Radio Service
  • the voice default bearer establishment process Step 2 for establishing a default bearer between the UE and the IMS access point is executed as in the case of the general call transmission.
  • priority level 15 that is, general call
  • ARP included in InitialInContext Setup Request sent by the MME to the eNB in the voice default bearer establishment process Step2
  • the call is sent to the eNB. It is notified that it is a general call. For this reason, there is a possibility that a problem may occur in the handover accompanying the movement of the UE.
  • FIG. 4 is a sequence diagram showing a problem of handover in originating an emergency call of VoLTE.
  • Two eNBs eNB1 and eNB2 are shown to illustrate the handover problem.
  • the UE first attaches to eNB1. Therefore, UE and eNB1 execute RRC Connection establishment process Step1, and UE, eNB1, and MME execute voice default bearer establishment process Step2.
  • Measurement Report is a signal indicating the reception quality of radio waves from the eNB to which the UE is attached and the reception quality of radio waves from other eNBs. If the UE communicates with eNB2 better than eNB1 and the reception quality at the UE improves, eNB1 determines the handover of the UE and transmits a Handover Request to eNB2 for that UE. Handover Request contains the information element ARP. Since the eNB is notified of the general call by the Initial Context Setup Request, the priority level is set to 15 (that is, the general call) in the ARP included in the Handover Request.
  • eNB2 has decided not to accept a general call in CAC (Call Admission Control) due to congestion before receiving a Handover Request.
  • CAC Common Admission Control
  • the eNB 2 that has received the Handover Request does not accept the call (“CAG NG” in the figure), and the handover fails.
  • the radio wave between the UE and the eNB 1 is weakened, and the UE and the eNB 1 become unable to communicate (call loss occurs).
  • the present invention relates to an emergency call when a voice default bearer for a general call is established for an emergency call of VoLTE and a handover is to be executed before a voice default bearer for an emergency call is established.
  • a handover source radio base station, a handover destination radio base station, a radio communication system, and a radio communication method are provided.
  • the handover source radio base station determines whether a call of VoLTE (Voice over LTE) transmitted from a user apparatus is an emergency call based on a message at the time of transmission from the user apparatus In response to a first bearer establishment request message sent from a mobility management entity indicating that the call is a general call, regardless of whether the call is actually a general call or an emergency call.
  • VoLTE Voice over LTE
  • an emergency voice default bearer establishment unit that establishes a voice default bearer for an emergency call with respect to the call
  • a handover determining unit that determines whether or not the call of the user apparatus should be handed over to the radio base station, and the other when the handover determination unit determines that the call of the user apparatus should be handed over
  • a handover request transmitter configured to transmit a handover request to the radio base station of the wireless base station, wherein the handover request transmitter is configured such that after the voice default bearer for the general call is established by the general voice default bearer establishment unit,
  • the emergency call determining unit determines that the call is an emergency call.
  • the handover request includes information indicating that
  • the wireless communication method determines whether a VoLTE (Voice over LTE) call transmitted from a user apparatus is an emergency call based on a message at the time of transmission from the user apparatus at a handover source radio base station.
  • a VoLTE Voice over LTE
  • the handover source radio base station establishes a voice default bearer for a general call with respect to the call, and the handover source radio base station determines another radio base based on a report from the user apparatus.
  • Determining whether or not to hand over the call of the user equipment to a station, and determining that the call of the user equipment should be handed over Transmitting a handover request to the other radio base station at the source radio base station, wherein the handover request is transmitted after the voice default bearer for the general call is established. If the call is determined to be an emergency call when the handover request is transmitted before the voice default bearer for the emergency call is established, Including information indicating that the call is a call.
  • the handover source radio base station determines whether or not the VoLTE (Voice over LTE) call transmitted from the user apparatus is an emergency call based on a message at the time of transmission from the user apparatus. Then, after the voice default bearer for the general call is established and before the voice default bearer for the emergency call is established, it is determined that the call is an emergency call when a handover request is transmitted.
  • VoLTE Voice over LTE
  • the handover source radio base station includes information indicating that the call is an emergency call in the handover request.
  • the handover destination radio base station can recognize from the information included in the handover request that the call to be handed over is an emergency call.
  • the handover destination radio base station can accept the handover of the emergency call even if congestion occurs. In this way, in the present invention, emergency call handover can be ensured.
  • the wireless communication network has a larger number of eNBs and a larger number of MMEs, and can communicate with a larger number of UEs.
  • FIG. 5 is a sequence diagram showing a part of a control procedure and a handover procedure in a wireless communication network in a VoLTE call transmission according to a first embodiment of the present invention.
  • the UE when a call is transmitted in the UE, the UE first attaches to the eNB 1.
  • UE and eNB1 perform RRC Connection establishment process Step11.
  • RRC Connection establishment process Step11 UE transmits RRC Connection Request to eNB1, eNB1 transmits RRC Connection Setup to UE, and UE transmits RRC Connection Setup Complete to eNB1.
  • the eNB1 is based on the RRC Connection Request (message at the time of transmission from the user apparatus) transmitted from the UE to the eNB1. Then, it is determined whether or not the VoLTE call transmitted from the UE is an emergency call ("emergency call determination" in the figure). Specifically, when the information element EstablishmentECause included in the RRC Connection Request indicates that the call is an emergency call, the eNB1 determines that the call is an emergency call. In other cases, the eNB1 It is determined that the call is a general call.
  • the UE, eNB 1 and MME execute the voice default bearer establishment process Step 2.
  • the contents of the voice default bearer establishment process Step2 are the same as those of the voice default bearer establishment process Step2 of the control procedure shown in FIGS.
  • an Initial Context Setup Request that includes an information element ARP with a priority level set to 15 (that is, a general call) is sent from the MME.
  • the eNB 1 establishes a voice default bearer for the general call regarding the call.
  • Measurement Report is a signal indicating the reception quality of radio waves from the eNB to which the UE is attached and the reception quality of radio waves from other eNBs. If the UE communicates with eNB2 better than eNB1 and the reception quality at the UE improves, eNB1 (handover source base station) determines the handover of the UE, and handover request (handover request) to eNB2 for that UE. ).
  • the eNB 1 determines whether or not to hand over the call of the UE to another eNB based on the report from the UE, and transmits a handover request to the other eNB when determining that the handover should be performed. .
  • a dedicated bearer for the call is established through a normal procedure, and voice communication is started. That is, if the call is a general call, the SIP procedure Step3, the voice dedicated bearer establishment process Step4, and the voice communication start Step5 are executed as in the control procedure of FIG.
  • the voiced dedicated bearer establishment process Step4 regardless of whether the call is actually a general call or an emergency call, the information element ARP with a priority level set to 15 (that is, a general call) is sent from the MME.
  • the eNB 1 In response to the included E-RAB Setup Request (bearer establishment request message indicating that the call is a general call), the eNB 1 establishes a voice dedicated bearer for the general call with respect to the call.
  • the emergency call notification process Step6 the emergency voice default bearer establishment process Step7, SIP procedure Step 8, emergency voice dedicated bearer establishment processing Step 9 and voice communication start Step 10 are executed.
  • the E-RAB Setup Request (call is actually an emergency call) including the information element ARP that is sent from the MME and has a priority level other than 15 (that is, emergency call) is set.
  • the second bearer establishment request message indicating that the eNB 1 establishes a voice default bearer for an emergency call regarding the call.
  • E-RAB Setup Request (call is actually urgent) including the information element ARP that is sent from MME and whose priority level is set to something other than 15 (that is, emergency call)
  • the eNB 1 In response to a bearer establishment request message indicating that the call is a call, the eNB 1 establishes a voice dedicated bearer for an emergency call regarding the call.
  • eNB1 After the voice default bearer for the general call is established (voice default bearer establishment process Step2), and before the voice default bearer for the emergency call is established (emergency voice default bearer establishment process Step7), When eNB1 transmits a Handover Request and eNB1 determines that the call is an emergency call in the emergency call determination, eNB1 clearly indicates in the Handover Request that the call is an emergency call. Include information.
  • the information that clearly indicates that the call is an emergency call may be a flag, for example, and the type of the information is not limited.
  • this information is information different from the information element ARP (indicating the priority level) that can be included in the Handover request, and the eNB that receives the Handover request has a priority level of 15 in the ARP included in the Handover request. Even if it is set to (that is, a general call), it is recognized that the call is an emergency call if information indicating that the call is an emergency call is included in the Handover request.
  • eNB2 handover destination radio base station
  • CAC OK congestion occurs
  • the eNB1 may include, in particular, information indicating that the call is a general call in the Handover Request. Such information may not be included. That is, if the call is a general call, the Handover Request may be specified or implied that it is a general call.
  • eNB2 When eNB2 that has decided not to accept a general call in CAC receives a Handover request that does not include information that clearly indicates that the call is an emergency call (expressly or implies that the call is a general call) The acceptance of the general call handover is rejected. In this way, depending on whether the call is actually an emergency call or a general call, the eNB 2 that is the handover destination radio base station can appropriately determine whether or not to accept the call handover.
  • FIG. 6 is a block diagram showing a configuration of radio base station (eNB) 10 according to the first embodiment of the present invention.
  • the radio base station 10 can function as both the handover source radio base station (eNB1) and the handover destination radio base station (eNB2).
  • the radio base station 10 includes a radio transmission unit 12, a radio reception unit 14, an inter-base station communication interface 16, an access point interface 18, an MME interface 20, and a control unit 22.
  • the wireless transmission unit 12 is a wireless transmission circuit that transmits a wireless signal to the UE
  • the wireless reception unit 14 is a wireless reception circuit that receives a wireless signal from the UE.
  • the inter-base station communication interface 16 is an interface for communicating with other eNBs.
  • the access point interface 18 is an interface for communicating with an SP mode access point, an IMS access point, and an IMS emergency call access point.
  • the MME interface 20 is an interface for communicating with the MME.
  • the control unit 22 includes an emergency call determination unit 220, a handover determination unit 222, a handover request transmission unit 224, a congestion determination unit 226, and a handover control unit 228.
  • the control unit 22 is a CPU (central processing unit), for example, and operates according to a computer program.
  • the emergency call determination unit 220, the handover determination unit 222, the handover request transmission unit 224, the congestion determination unit 226, and the handover control unit 228 are functional blocks realized by the control unit 22 functioning according to the computer program.
  • the emergency call determination unit 220 determines that the VoLTE call transmitted from the UE is based on the information element EstablishmentECause included in the RRC Connection Request that the UE transmits to the eNB1. Determine if it is an emergency call.
  • the handover determination unit 222 determines whether or not to hand over the call of the UE to another eNB based on the report (Measurement Report) from the UE.
  • the handover request transmission unit 224 passes through the inter-base station communication interface 16. Send Handover Request to other eNBs.
  • the handover request transmission unit 224 transmits a Handover Request and the emergency call determination unit 220 determines that the call is an emergency call, the handover request transmission unit 224 indicates that the call is an Emergency call. Include information indicating
  • the congestion determination unit 226 determines whether or not this eNB is in a congestion state. When it is determined that the eNB is in a congestion state, the congestion determination unit 226 determines that the CAC does not accept a general call.
  • the inter-base station communication interface 16 functions as a handover request receiving unit that receives a Handover request from another eNB.
  • the handover control unit 228 functions.
  • the congestion determination unit 226 determines that this eNB is in a congested state, and when the inter-base station communication interface 16 receives a handover request including information indicating that the call is an emergency call from another eNB, the handover is performed.
  • the control unit 228 starts communication with the UE according to Handover Request.
  • the handover control unit 228 rejects the Handover Request.
  • the control part 22 performs the bearer establishment process for UE in cooperation with another element.
  • the initial including the information element ARP that is sent from the MME and has a priority level set to 15 (that is, a general call)
  • Context Setup Request a first bearer establishment request message indicating that the call is a general call
  • the control unit 22, the radio transmission unit 12, the radio reception unit 14, and the access point interface 18 A voice default bearer for the call is established between the IMS access point and the UE. That is, the control unit 22, the wireless transmission unit 12, the wireless reception unit 14, and the access point interface 18 function as a general voice default bearer establishment unit.
  • the information element ARP with a priority level set to 15 (that is, a general call) is sent from the MME.
  • the control unit 22, the radio transmission unit 12, the radio reception unit 14 and the access point interface 18 A voice dedicated bearer for the call is established between the IMS access point and the UE. That is, the control unit 22, the wireless transmission unit 12, the wireless reception unit 14, and the access point interface 18 function as a general voice dedicated bearer establishment unit.
  • the E-RAB Setup Request (call is actually an emergency call) including the information element ARP that is sent from the MME and has a priority level other than 15 (that is, emergency call) is set.
  • the second bearer establishment request message indicating that the control unit 22, the wireless transmission unit 12, the wireless reception unit 14, and the access point interface 18 have set a voice default bearer for an emergency call regarding the call.
  • the control unit 22, the wireless transmission unit 12, the wireless reception unit 14, and the access point interface 18 function as an emergency voice default bearer establishment unit.
  • E-RAB Setup Request (call is actually urgent) including the information element ARP that is sent from MME and whose priority level is set to something other than 15 (that is, emergency call)
  • the control unit 22, the radio transmission unit 12, the radio reception unit 14, and the access point interface 18 perform a voice dedicated bearer for an emergency call regarding the call. Is established between the IMS emergency call access point and the UE. That is, the control unit 22, the wireless transmission unit 12, the wireless reception unit 14, and the access point interface 18 function as an emergency voice dedicated bearer establishment unit.
  • the general voice default bearer establishment unit of the handover source radio base station in response to the first bearer establishment request message indicating that the call transmitted from the mobility management entity (MME) is a general call regardless of whether the call is actually a general call or an emergency call, the general voice default bearer establishment unit of the handover source radio base station establishes a voice default bearer for a general call regarding the call.
  • the emergency call determination unit 220 of the handover source radio base station determines whether or not the VoLTE call transmitted from the user apparatus is an emergency call based on a message (RRC Connection Request) at the time of transmission from the user device. .
  • the handover request transmitting unit 224 of the handover source radio base station includes information indicating that the call is an emergency call in the Handover Request.
  • the handover control unit 228 of the handover destination radio base station can recognize that the call to be handed over is an emergency call from the information included in the Handover Request. If the call to be handed over is an emergency call, the handover control unit 228 of the handover destination radio base station can accept the handover of this emergency call even if congestion occurs. In this way, emergency call handover can be ensured.
  • FIG. 7 is a sequence diagram illustrating a handover problem that can be assumed in the first embodiment of the present invention.
  • a Handover Request including information indicating that a call is an emergency call is transmitted from eNB1 to eNB2, and a VoLTE call that is an emergency call is handed over from eNB1 to eNB2.
  • the emergency call is terminated at the UE while the eNB 2 has information indicating that the call is an emergency call.
  • Ending the call at the UE and releasing the call on the wireless communication network are not simultaneous.
  • the call is maintained for a certain period without being released. The length of this period depends on the operator of the wireless communication network, but can be for example several minutes.
  • the MME sends an E-RAB Release Request to the eNB (eNB2) to which the UE has attached to release the call, the eNB2 sends an RRC Connection Reconfiguration to the UE, and the UE eNB2 Sends RRC Connection Reconfiguration Complete, and eNB2 sends E-RAB Release Response to MME.
  • the UE initiates a data call or a general voice call.
  • the eNB 2 accepts a new call even if the call is terminated.
  • the UE can transmit a measurement report to the eNB 2.
  • the eNB2 determines the handover of the UE, and the other eNB (for example, eNB1) for the UE To Handover Request. If eNB1 accepts Handover Request, the UE attaches to eNB1 and the call continues.
  • eNB1 has decided not to accept a general call in CAC due to congestion of eNB1 before receiving Handover Request. If this Handover Request contains information indicating that the call to be handed over is an emergency call, even if this call is actually a data call or a general voice call ENB1 treats this call as an emergency call, UE attaches to eNB1, and the call continues. In other words, when the eNB always holds information indicating that it is an emergency call and includes information indicating that it is an emergency call in the Handover request, even if the call related to the Handover request is not actually an emergency call, Handover is established.
  • FIG. 8 is a sequence diagram showing a control procedure in a radio communication network in VoLTE emergency call handover according to a second embodiment of the present invention.
  • the call from eNB1 to eNB2 is an emergency call.
  • a Handover Request including the indicated information is transmitted.
  • emergency voice default bearer establishment processing Step 17 is executed.
  • MME sends E-RAB Setup Request to eNB2
  • eNB2 sends RRC Connection Reconfiguration to UE
  • UE sends RRC Connection Reconfiguration Complete to eNB2
  • eNB2 sends E-RAB Setup Response to MME.
  • the emergency voice default bearer establishment process Step 17 a default bearer is established between the UE and the IMS emergency call access point via the eNB2.
  • the priority level is set to other than 15 (that is, emergency call) in the information element ARP included in the E-RAB Setup Request (third bearer establishment request message) sent by the MME to the eNB2.
  • the MME and higher-level devices already know whether the call to be handed over is actually an emergency call or a general call.
  • the eNB 2 invalidates information indicating that the call is an emergency call.
  • a mode of invalidation for example, deleting the information stored in the memory (not shown) of the eNB 2 and other invalidations can be considered.
  • SIP procedure Step 18 is executed using a default bearer set between the UE and the IMS emergency call access point via eNB2. Further, the emergency bear dedicated bearer establishment process Step 19 is executed.
  • MME sends E-RAB Setup Request to eNB2
  • eNB2 sends RRC Connection Reconfiguration to UE
  • UE sends RRC Connection Reconfiguration Complete to eNB2
  • eNB2 sends E-RAB Setup Response to MME. To do.
  • the priority level is other than 15 in the information element ARP included in the E-RAB Setup Request (fourth bearer establishment request message) sent by the MME to the eNB 2 (that is, an emergency call) Is set to
  • a dedicated bearer is established between the UE and the IMS emergency call access point via the eNB2. Thereafter, voice communication by VoLTE becomes possible via eNB2. In this way, the VoLTE call that is an emergency call is handed over from eNB1 to eNB2.
  • the MME sends an E-RAB Release Request to the eNB (eNB2) to which the UE has attached to release the call
  • the eNB2 sends an RRC Connection Reconfiguration to the UE
  • the UE eNB2 Sends RRC Connection Reconfiguration Complete
  • eNB2 sends E-RAB Release Response to MME.
  • the UE makes a data call or a general voice call.
  • the eNB 2 accepts a new call even if the call is terminated.
  • the UE can transmit a measurement report to the eNB 2.
  • the eNB2 determines the handover of the UE, and the other eNB (for example, eNB1) for the UE To Handover Request (second handover request). If eNB1 accepts Handover Request, the UE attaches to eNB1 and the call continues.
  • eNB1 has decided not to accept a general call in CAC due to congestion of eNB1 before receiving Handover Request. If this Handover Request contains information indicating that the call to be handed over is an emergency call, even if this call is actually a data call or a general voice call ENB1 treats this call as an emergency call, UE attaches to eNB1, and the call continues.
  • the eNB 2 when the E-RAB Setup Request already received indicates that the immediately preceding call is actually an emergency call, the eNB 2 The information indicating that the call is an emergency call is invalidated. Since eNB2 invalidates emergency call information, when transmitting a Handover request (second handover request) after the previous call is terminated, eNB2 returns a Handover request (second handover request). Do not include information indicating that the new call is an emergency call.
  • the eNB 2 may include information clearly indicating that the call is a general call in the Handover request. That is, the Handover request may be specified or implied that it is a general call.
  • eNB1 When eNB1 that has decided not to accept a general call in CAC receives a Handover Request that does not include information that clearly indicates that the call is an emergency call (expressly or implies that the call is a general call) The acceptance of the handover of this new call (data call or general voice call) is rejected. Therefore, according to the second embodiment, it is possible to eliminate the possibility that a data call or a general voice call sent immediately after an emergency call is terminated will be preferentially performed in the handover.
  • eNB2 When eNB2 handles an emergency call that has been handed over, eNB2 establishes a third bearer for a voice default bearer indicating that the call (previous call) is an emergency call in emergency voice default bearer establishment processing Step 17
  • a request message (E-RAB Setup Request) is received from the MME, and in the emergency voice dedicated bearer establishment process Step19, the call (previous call) for the voice dedicated bearer indicating that it is an emergency call
  • a fourth bearer establishment request message (E-RAB Setup Request) is received from the MME.
  • the trigger for invalidating the information indicating that the call is an emergency call may be reception of a third bearer establishment request message or reception of a fourth bearer establishment request message.
  • the eNB2 sends a Handover request for handover of a new call (data call or general voice call). There can be a situation of transmission.
  • the third bearer establishment request message (E-RAB Setup) received in the emergency bearer default bearer establishment process Step 17 is used.
  • (Request) it is preferable to invalidate information indicating that the call is an emergency call.
  • the configuration of the radio base station (eNB) according to the second embodiment may be the same as the configuration shown in FIG.
  • the radio base station 10 can function as both the handover source radio base station (eNB1) and the handover destination radio base station (eNB2).
  • the inter-base station communication interface 16 functions as a handover request receiving unit that receives a Handover Request from the handover source radio base station.
  • the MME interface 20 receives a handover request from the MME interface after the handover request receiving unit receives the handover request, and receives a bearer establishment request message (emergency voice default bearer establishment process Step 17 and It functions as a bearer establishment request message receiving unit for receiving the emergency bearer dedicated bearer establishment process Step 19 E-RAB Setup Request).
  • the emergency bearer default bearer establishment process Step 17 in response to the third bearer establishment request message (E-RAB Setup Request), the control unit 22, the radio transmission unit 12, the radio reception unit 14, and the access point interface 18 A voice default bearer for an emergency call is established between the IMS access point and the UE for the call.
  • the emergency voice dedicated bearer establishment process Step 19 in response to the fourth bearer establishment request message (E-RAB Setup Request), the control unit 22, the radio transmission unit 12, the radio reception unit 14 and the access point interface 18
  • the voice dedicated bearer for the emergency call is established between the IMS access point and the UE. That is, the control unit 22, the wireless transmission unit 12, the wireless reception unit 14, and the access point interface 18 function as a bearer establishment unit.
  • the control unit 22 functions as a new call accepting unit that accepts a new call when a new call is transmitted from the UE related to the terminated call even after the previous call is terminated.
  • the handover determining unit 222 functions as a second handover determining unit that determines whether or not to hand over a new call of the UE to another eNB based on a report from the UE.
  • the handover request transmission unit 224 transmits a Handover Request (second handover request) to another eNB when the second handover determination unit determines that the new call of the UE should be handed over It functions as a handover request transmission unit.
  • the handover determination unit 222 as the second handover request transmission unit receives the bearer establishment request message reception unit (MME interface 20) from the MME when transmitting the second handover request after the previous call is terminated. If the bearer establishment request message (E-RAB Setup Request, particularly preferably E-RAB Setup Request in the emergency voice default bearer establishment process Step 17) indicates that the immediately preceding call is actually an emergency call, The information indicating that the new call is an emergency call is not included in the second handover request. For this purpose, the control unit 22 determines that the bearer establishment request message (E-RAB (Setup Request, particularly preferably E-RAB Setup Request in the emergency bearer default bearer establishment process Step 17) received from the MME is the previous call. Information indicating that the call is an emergency call is invalidated.
  • E-RAB Setup Request, particularly preferably E-RAB Setup Request in the emergency bearer default bearer establishment process Step 17
  • the congestion judgment unit 226 functions as a first congestion judgment unit that judges whether or not the handover destination radio base station is in a congestion state.
  • the handover control unit 228 follows the Handover request.
  • the first congestion determination unit determines that the handover destination radio base station is in a congestion state
  • the Handover request does not include information indicating that the call is an emergency call
  • It functions as a first handover control unit that rejects Handover Request.
  • the congestion judgment unit 226 functions as a second congestion judgment unit that judges whether or not this radio base station is in a congestion state
  • the inter-base station communication interface 16 functions as a second handover request receiving unit that receives a second handover request (Handover Request) from the handover destination radio base station (eNB2).
  • the handover control unit 228 includes: When communication with the UE is started according to the second handover request, the second congestion determination unit determines that the radio base station is in a congestion state, and information indicating that the new call is an emergency call is second Function as a second handover control unit that rejects the second handover request when the second handover request is not included.
  • the same effect as that of the first embodiment is achieved.
  • the bearer establishment request message received from the MME. ENB indicates that the previous call is actually an emergency call
  • the eNB does not include information indicating that the new call is an emergency call in the second handover request.
  • the handover control unit 228 of the radio base station that receives the second handover request can recognize from the second handover request that the call to be handed over is a general call. Therefore, it is possible to eliminate the possibility that a data call or a general voice call transmitted immediately after the emergency call is terminated is preferentially performed in the handover.
  • each function executed by the CPU may be executed by hardware instead of the CPU, for example, by a programmable logic device such as an FPGA (Field Programmable Gate Array) or DSP (Digital Signal Processor). May be executed.
  • a programmable logic device such as an FPGA (Field Programmable Gate Array) or DSP (Digital Signal Processor). May be executed.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
PCT/JP2013/071974 2012-09-26 2013-08-15 Station de base radio source de transfert intercellulaire, station de base radio destination de transfert intercellulaire, système et procédé de radiocommunication Ceased WO2014050345A1 (fr)

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JP2012213011A JP5412566B1 (ja) 2012-09-26 2012-09-26 ハンドオーバ元無線基地局、ハンドオーバ先無線基地局、無線通信システムおよび無線通信方法

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JP6320458B2 (ja) * 2016-06-09 2018-05-09 ソフトバンク株式会社 移動体通信システム
EP3562218B1 (fr) * 2017-01-14 2021-03-10 Huawei Technologies Co., Ltd. Procédé et dispositif de gestion pour réception discontinue
US20230337088A1 (en) * 2022-04-18 2023-10-19 Dish Wireless L.L.C. Inter-System Handover

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