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WO2013012371A1 - Repli à commutation de circuits pour une radio mobile - Google Patents

Repli à commutation de circuits pour une radio mobile Download PDF

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Publication number
WO2013012371A1
WO2013012371A1 PCT/SE2012/050696 SE2012050696W WO2013012371A1 WO 2013012371 A1 WO2013012371 A1 WO 2013012371A1 SE 2012050696 W SE2012050696 W SE 2012050696W WO 2013012371 A1 WO2013012371 A1 WO 2013012371A1
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WO
WIPO (PCT)
Prior art keywords
circuit
base station
switched service
switched
radio base
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/SE2012/050696
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English (en)
Inventor
Walter Müller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
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Telefonaktiebolaget LM Ericsson AB
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Filing date
Publication date
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of WO2013012371A1 publication Critical patent/WO2013012371A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H04W36/00224—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H04W36/0094—Definition of hand-off measurement parameters

Definitions

  • the technology relates to radio communications, and in particular, to mobile radios that can obtain services from both packet-switched and circuit-switched networks.
  • a mobile radio referred to as a user equipment (UE) hereafter, that is equipped with dual radio receiver (RX) or a dual radio may at the same time be connected to two different cellular networks such as a Long-Term Evolution (LTE) network and a Code Division Multiple Access (CDMA) network.
  • LTE Long-Term Evolution
  • CDMA Code Division Multiple Access
  • PS packet-switched
  • CS circuit-switched
  • circuit-switched service in the CDMA system is a circuit-switched voice call service.
  • the UE can originate the circuit-switched service request, e.g., make a circuit-switched voice call, or receive the circuit-switched service, e.g., receive a page for an incoming circuit-switched voice call to the UE.
  • the temporary change from the LTE system to the CDMA system for the circuit-switched service is termed "Circuit- Switched FallBack" (CSFB) in 3 GPP.
  • CSFB Circuit- Switched FallBack
  • the UE may perform idle mode cell reselection and page monitoring independently in both systems at the same time.
  • the UE may perform an LTE access to make the LTE system aware of this page and that the UE may be unreachable for a time period during which the UE connects to the CDMA system.
  • CS fallback [from the LTE system] to lxRTT [the CDMA system] enables the delivery of CS-domain services when a UE is being served by the E-UTRAN [analogous to LTE].
  • the UE initiates "lxCSFB (e.g. to perform a lxCS call origination or accept a l CS call termination) by using non-access stratum (NAS) signaling to send a CSFB [circuit-switched fallback] indication to the MME [Mobility Management Entity].
  • NAS non-access stratum
  • the MME indicates to the eNB that lxCSFB is required.” This triggers the eNB (a base station in LTE) to execute one of the following circuit-switched fallback procedures depending on network support and UE capability:
  • a Rel-8 lxCSFB fallback procedure [e.g., from the LTE system to the CDMA system] characterized for example by a radio resource control (RRC) connection release with redirection to lx Radio Transmission Technology (lxRTT).
  • RRC radio resource control
  • lxRTT is the core CDMA2000 wireless air interface standard.
  • the designation "lx”, meaning 1 times Radio Transmission Technology, indicates one carrier at the same radio frequency (RF) bandwidth as IS-95: a duplex pair of 1.25 MHz radio channels,
  • a problem with known CSFB procedure is that it requires signaling between a core network node, e.g., the MME in LTE, and the UE, which delays the delivery of the circuit-switched service to the point where it may be noticeable to end users—which is undesirable. Indeed, users operating in the packet-switched system expect a fallback circuit-switched service to be delivered with no more delay than if the service were directly provided by the circuit-switched system.
  • a mobile radio terminal e.g., a UE that is in communication with a first packet-switched service network via a first radio base station detects a request or a need for a circuit-switched service. In response, the mobile radio terminal generates a measurement report and sends it to the first radio base station. The first base station sends a message, e.g., a release message, directing the mobile radio terminal to establish a connection to receive the circuit-switched service from a second circuit- switched service network via a second radio base station, which the mobile radio terminal does.
  • that message is sent to initiate a circuit-switched fallback procedure without having to request permission from a core network node in the first packet-switched service network thereby reducing service delay experienced by a user.
  • a first aspect of the technology includes a mobile radio terminal with first radio circuitry to communicate with a first packet-switched service network via a first radio base station and second radio circuitry to communicate with a second circuit- switched service network.
  • Processing circuitry is configured to perform several tasks. First, a request for a circuit-switched service is detected, e.g., a voice call circuit- switched service, and in response, a measurement report is generated.
  • a circuit-switched service is detected, e.g., a voice call circuit- switched service, and in response, a measurement report is generated.
  • a measurement report is sent to the first radio base station via the first radio circuitry.
  • a message is returned from the first base station directing the mobile radio terminal to establish a connection to receive the circuit-switched service from the second circuit- switched service network via a second radio base station.
  • One example of such a message is a release with redirection for circuit-switched fallback message.
  • the second radio circuitry is activated to establish the connection for the circuit- switched service.
  • the measurement report includes information that the first radio base station interprets as a request for the circuit-switched service, and in a particular example embodiment, the measurement report includes information indicating a circuit- switched fallback request.
  • the measurement report information may also optionally include one or more of the following: a cell identifier of a cell associated with a second radio base station in the second circuit-switched service network, a carrier frequency, a measurement identifier, or a non-valid measurement value.
  • the mobile radio terminal may establish a connection with the first packet-switched service network via a first radio base station prior to detecting the request, and it may also send a capability message to the first radio base station to inform the first radio base station that the mobile radio terminal can support circuit- switched fallback.
  • the terminal may at some point receive a measurement
  • An example implementation includes an LTE system as the first packet- switched service network, an eNodeB as the first radio base station, a IXRTT system as the second circuit-switched service network, and a CDMA-based second radio base station.
  • a second aspect of the technology includes a first radio base station that communicates with a mobile radio terminal over a radio interface.
  • the base station also communicates with a network node in a first packet-switched service network that provides packet-switched services.
  • the base station receives a measurement report from the mobile radio terminal that includes information indicating a request or need for a circuit-switched service.
  • a redirect message is generated and sent to the mobile radio terminal directing the mobile radio terminal to a frequency associated with a second circuit-switched service network.
  • a release message is generated and sent to the first packet-switched service network to cause the mobile radio terminal to be connected to a second radio base station to obtain the circuit-switched service.
  • the radio base station generates and sends to the mobile radio terminal a measurement configuration message that indicates the information to be included in the measurement report associated with a request or need for a circuit-switched service.
  • the radio base station sends the release message to initiate a circuit-switched fallback procedure without having to request permission from a core network node in the first packet-switched service network.
  • Figure 1 illustrates a non-limiting example of a UE that may
  • PS packet-switched
  • CS circuit-switched
  • Figure 2 is a signaling diagram that illustrates non-limiting examples of signaling to implement CSFB in accordance with one example embodiment
  • Figure 3 is a flowchart illustrating example, non-limiting procedures implemented by a UE to request and obtain a CSFB service
  • Figure 4 is a flowchart illustrating example, non-limiting procedures implemented by a base station involved in receiving a CSFB request and facilitating provision of a CSFB service;
  • Figure 5 is a non-limiting function block diagram of a UE
  • Figure 6 is a non-limiting function block diagram of a base station
  • Figure 7 is a non-limiting function block diagram of a core network node (such as an MME in an LTE network);
  • Figure 8 illustrates CSFB in a specific but still example context of an LTE PS network and a l RTT CS network
  • Figure 9 shows an example of a UE handover to the lxRTT for a CSFB service in an example context like that shown in Figure 8.
  • Hardware implementation may include or encompass, without limitation, digital signal processor (DSP) hardware, a reduced instruction set processor, hardware (e.g., digital or analog) circuitry including but not limited to application specific integrated circuit(s) (ASIC) and/or field programmable gate array(s) (FPGA(s)), and (where appropriate) state machines capable of performing such functions.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • state machines capable of performing such functions.
  • a computer is generally understood to comprise one or more processors or one or more controllers, and the terms computer, processor, and controller may be employed interchangeably.
  • processor When provided by a computer, processor, or controller, the functions may be provided by a single dedicated computer or processor or controller, by a single shared computer or processor or controller, or by a plurality of individual computers or processors or controllers, some of which may be shared or distributed.
  • processor or “controller” also refers to other hardware capable of performing such functions and/or executing software, such as the example hardware recited above.
  • UE User Equipment
  • base station is used in its most general sense to refer to a wireless access point in a wireless
  • a network node includes base stations and other network nodes.
  • FIG. 1 illustrates a non-limiting example of a UE 10 that may communicate with a network that supports packet-switched (PS) services and another network that supports circuit-switched (CS) services (and may or may not also support PS services).
  • the UE 10 includes suitable radio circuitry 12.
  • PS packet- switched
  • CS circuit-switched
  • circuitry 12 includes radio circuitry 14A for communicating with the PS services network and radio circuitry 14B for communicating with the CS services network.
  • the UE 10 may typically obtain services from the network supporting PS services, there may be times when the UE 10 will need or want to "fallback" to the network supporting CS services to obtain a CS service, referred to herein as CS fallback (CSFB).
  • CS fallback Non-limiting examples of such CS services include voice and its
  • USB Supplementary Service Data
  • LCS LoCation Service
  • SMS Short Message Service
  • LI Lawful Interception
  • CS DUI video etc.
  • USSD Supplementary Service Data
  • LCS LoCation Service
  • SMS Short Message Service
  • LI Lawful Interception
  • CS DUI video etc.
  • the technology described here allows the UE 10 to perform CS fallback and provide CS services with more efficiency and with less delay.
  • a UE may request an action from the system by using a measurement report with network (NW)-coordinated and UE-coordinated specific content and can also be used for indicating a UE preference as in the example specified in 3GPP TS 43.318 vl 0.1.0 ch 9.14 described at
  • the mobile station (another term for a UE) includes information about a generic access network (GAN) Iu mode cell in the Measurement Report message sent to the radio network controller (RNC).
  • GAN generic access network
  • RNC radio network controller
  • the RNC decides to initiate handover to the GAN Iu mode cell.
  • the RNC starts the preparation phase of the Relocation procedure by sending a Relocation Required message to the mobile switching center (MSC), identifying the target GAN Iu mode cell.
  • MSC mobile switching center
  • the GAN controller acknowledges the relocation request message, using a Relocation Request Acknowledge message, indicating it can support the requested handover, and includes a Physical Channel Reconfiguration message to indicate the radio channel to which the MS should be directed.
  • the MSC sends the Relocation Command message to the RNC, completing the relocation preparation.
  • the RNC sends the Physical Channel Reconfiguration message to the MS to initiate handover to GAN lu mode.
  • the MS does not switch its audio path from UTRAN to GAN until handover completion (i.e., until it sends the GA-RRC HANDOVER COMPLETE message) to keep the audio interruption short.
  • the source RNC confirms the release of UTRAN resources allocated for this call using lu Release Complete.
  • the RNC may request that the MS report either the downlink Ec/No (received energy per chip divided by the noise power spectral density in the band) or downlink RSCP (Received Signal Code Power) measurement quantities.
  • the MS reports maximum values for the Ec/No or RSCP quantities.
  • the standard specifies a maximum value of Ec/No is 63 and a maximum value of RSCP is 91.
  • the above text describes a process for setting of information elements in a UE measurement report (MR) as asked for by RNC.
  • MR UE measurement report
  • the inventor recognized that maximum values is set in such a measurement report need not be interpreted as actual measured values.
  • the RNC can re-use a legacy measurement report as a vehicle for receiving a CSFB request from a UE by having the UE include, for example, maximum or invalid values set for information elements set in the already existing measurement report.
  • using a measurement report is one example indicating a request for CSFB.
  • Other messages can be used.
  • the measurement configuration primarily indicates whether the UE is allowed to ask for CSFB, and secondarily, the measurement configuration may also indicate how.
  • the "how" part may be predefined for example in a standard specification.
  • Figure 2 is a signaling diagram that illustrates non-limiting examples of signaling to implement CSFB in accordance with one example embodiment.
  • the UE provides UE information (or some other node provides the UE
  • a serving base station that indicates that the UE supports CSFB. Additional information may also be provided such as for example radio capabilities of the UE, e.g., a dual receiver/single transmitter UE, a dual receiver/dual transmitter UE, a multi-mode UE, etc.
  • the base station responds with a measurement configuration message which informs the UE that the UE may request a CSFB service using a measurement report type message and provides some sort of information to indicate how the UE should indicate a CSFB request in the measurement report. For example, the base station may inform the UE that it may request a CSFB service by including a predetermined measurement value that will be interpreted by the BS as a CSFB request.
  • Any suitable agreed upon value included in the report message may be used, even an invalid or unused measurement value. These two signals only need be exchanged at initial set up. Another option is to exchange this information each time there is a cell change. Additional information may be included in the configuration message such as a carrier frequency, a cell identifier, etc.
  • FIG. 3 is a flowchart illustrating example, non-limiting procedures implemented by a mobile radio terminal (also called a UE) to request and obtain a CSFB service.
  • a mobile radio terminal also called a UE
  • the UE is in some sort of communication with a first packet-switched service network via a first radio base station (SI), e.g., an active connection, a monitoring broadcasts, camping on a cell of the BS, etc.
  • SI radio base station
  • the UE detects a request or a need for a circuit-switched service, and in response, generates a measurement report (S2) and sends the measurement report to the first radio base station via the first radio circuitry (S3).
  • a message from the first base station is then received directing the UE to establish a connection to receive the circuit-switched service from the second circuit- switched service network via a second radio base station (S4), which it then does (S5).
  • FIG. 4 is a flowchart illustrating example, non-limiting procedures implemented by a base station involved in receiving a CSFB request and facilitating provision of a CSFB service.
  • the base station includes radio circuitry to communicate with a UE over a radio interface and communications circuitry to communicate with a network node in a first packet-switched service network that provides packet-switched services.
  • the BS optionally sends a measurement configuration message that indicates that a circuit-switched service may be requested using a measurement report (S10).
  • the BS receives a measurement report from the UE that includes information associated with the measurement configuration message (SI 1).
  • the BS In response, the BS generates and sends to the UE a redirect message redirecting the mobile radio terminal to a frequency associated with a second circuit-switched service network (SI 2). Redirection is used by the base station to direct a UE to another frequency and/or radio access technology (RAT) to search for a best cell on that frequency/RAT and initiate a connection setup in that best cell. In this way, a source base station does not need to have detailed configured knowledge of cells on the target frequency/RAT. As shown in Figure 2, the BS also at the same time generates and sends to the first packet-switched service network a release message to cause the UE to be connected to a second radio base station to obtain the circuit-switched service (SI 3).
  • SI 3 circuit-switched service
  • the release may mean that the UE actually disconnects from or becomes in some way temporarily unavailable to the PS services network.
  • the UE radio circuitry is such that the release means that the UE carries on parallel connections with the network providing PS services and the network providing CS service.
  • Release and redirect are general messages that may be accomplished using existing or to be developed messages. For example, a redirect message may be implemented, but need not be, using a handover mechanism.
  • FIG. 5 is a non-limiting function block diagram of a UE 10.
  • the UE 10 includes first radio circuitry 12 configured to communicate with a first packet-switched service network via a first radio base station and second radio circuitry 12 configured to communicate with a second circuit-switched service network.
  • the radio circuitry communicates with processing circuitry 22 coupled to memory 20 that is configured to perform a number of functions including detecting a request during the connection for a circuit-switched service, and in response, generating a measurement report; sending the measurement report to the first radio base station via the first radio circuitry; receiving a message from the first base station directing the mobile radio terminal to establish a connection to receive the circuit-switched service from the second circuit-switched service network via a second radio base station; and activating the second radio circuitry to establish the connection for the circuit-switched service.
  • Non-limiting examples of the measurement report information includes one or more of the following: a cell identifier of a cell associated with a second radio base station in the second circuit-switched service network, a carrier frequency, a measurement identifier, or a non-valid measurement value.
  • the first radio circuitry may receive a measurement configuration message from the first radio base station that indicates that a circuit-switched service may be requested using a measurement report.
  • the UE may receive that information from another source.
  • FIG. 6 is a non-limiting function block diagram of a base station 24.
  • the base station 24 includes radio circuitry 26 configured to communicate with a UE 10 over a radio interface and communications circuitry 32 configured to communicate with a network node in a first packet-switched service network that provides packet- switched services.
  • the radio circuitry 26 communicates with processing circuitry 30 coupled to memory 28 that is configured to receive via the radio circuitry a measurement report from the UE that includes information indicating a request or need for a circuit-switched service; in response to the received measurement report, generate and send to the UE via the radio circuitry a redirect message directing the mobile radio terminal to a frequency associated with a second circuit-switched service network; and generate and send to the first packet-switched service network via the communications circuitry a release message to cause the UE to be connected to a second radio base station to obtain the circuit-switched service.
  • the processing circuitry sends the release message to initiate a circuit-switched fallback procedure without having to request permission from a core network node in the first packet-switched service network.
  • the processing circuitry 30 may optionally also be configured to generate and send to the UE a measurement configuration message that indicates the information to be included in the measurement report associated with a request or need for a circuit-switched service.
  • FIG. 7 is a non-limiting function block diagram of a core network node 34.
  • a core network node 34 is an MME in an LTE network.
  • the core network node 34 includes a processing unit 38 coupled to a memory 38 and a communication unit 40 for communicating to base stations, among other nodes.
  • the core network node 34 receives a UE context release request message from the base station and
  • Figure 8 illustrates CSFB in a specific but still example context of an LTE PS network and a IxRTT CS network.
  • the base station is an eNodeB (eNB) which agrees with the UE agree on a way of handling measurement configuration and measurement reports to allow the UE to request circuit-switched fallback (CSFB) and the eNB to grant the CSFB immediately without waiting for an MME response.
  • the agreed measurement configuration sent by the eNB indicates to UE that the eNB is prepared to receive a measurement result that is understood by the eNB as a CSFB request from the UE.
  • a similar method may be used for Universal Terrestrial Radio Access Network (UTRAN) to Generic Access Network (GAN) handover.
  • UTRAN Universal Terrestrial Radio Access Network
  • GAN Generic Access Network
  • the eNB answers the UE CSFB request immediately— without involving the MME— by sending a release with redirection for CSFB message directly to the UE. Other messages may be used.
  • One example is a handover command.
  • the eNB also sends a UE context release request message to the MME with a cause value, e.g., "CS Fallback Triggered.”
  • the MME responds with a UE context release command, and the eNB answers with UE context release complete. See for example 3GPP TS36.413, vlO.2.0, chapter 8.3.2, the disclosure of which is incorporated here by reference.
  • An eNB in LTE recognizes a UE's capabilities for example through one or more feature group indicators (FGIs) to determine whether the UE supports circuit- switched fallback (CSFB) to a circuit switched capable system like a CDMA2000 system.
  • FGIs feature group indicators
  • the UE may signal that it has a dual receiver (RX) capability.
  • RX dual receiver
  • the eNB configures the UE to measure on a
  • CDMA2000 frequency and CDMAIXRTT cell id measurement object The specific combination of carrier frequency and cell id in the circuit switched capable system informs to the UE that the UE may request CSFB to the circuit switched capable system, e.g., cdmalXRTT, directly from eNB using a measurement report.
  • CSFB circuit switched capable system
  • Figure 9 is a non-limiting function block diagram showing an example CSFB from LTE to a lxRTT circuit switched communications system in an example context like the 3 GPP example shown in Figure 8.
  • the eNB 24 sends a measurement configuration with specific content that indicates to the UE 10 that a CSFB request may be sent by using a measurement report based on this measurement configuration.
  • One or more values on information elements in the measurement report message may be selected so that other UEs not supporting the CSFB technology described here may respond, for example, with a measurement configuration failure.
  • the UE sends a measurement configuration acknowledgement.
  • Example messages names used in the LTE standard for signaling measurement configuration and acknowledge are RRC connection reconfiguration and RRC connection reconfiguration acknowledge.
  • the UE acknowledgement also indicates to the eNB that the UE may later request a CSFB by sending a measurement report.
  • the UE 10 requests a circuit-switched fallback (CSFB) to a circuit switched capable system like a CDMA2000 system, e.g., CSFBIXRTT, by sending a measurement report containing a specific measurement identifier (id) for the measurement configuration containing the specific and agreed (between the eNB and the UE) measurement object and also preferably an agreed cell global identify (CGI) information value (e.g., 47 bits in 3GPP) and specific, (e.g., extreme or invalid), measurement result values, e.g., 0.
  • CGI agreed cell global identify
  • MeasResultCDMA2000 :: SEQUENCE ⁇
  • the eNB station When the eNB station receives the UE's measurement report indicating a CSFB and verifies the report contains a valid CSFB request, the eNB sends an RRC Release message with redirection including a release cause, e.g., "cs- FallbackHighPriority," to the UE. The eNB then sends a UE context release request to the MME with a cause value "CS Fallback Triggered.” Subsequently, the base station receives a UE context release command response from the MME and may remove the UE context from that eNB, and answer that UE context release is complete.
  • a release cause e.g., "cs- FallbackHighPriority
  • CSFB circuit-switched fallback
  • eNB MME base station-core network node
  • the CSFB technology supports and is consistent with legacy signaling procedures, which means that already-implemented functionality can be re-used.
  • measurement configuration and reporting are already standardized and do not require interface update.
  • backward compatibility and to some extent forward compatibility, are supported because the base station and UE can select and agree upon some information, e.g., non-used measurement id's, carrier frequency, physical cell id, CGI and measurement result values, etc., to allow and indicate a CSFB request from the UE.
  • some information e.g., non-used measurement id's, carrier frequency, physical cell id, CGI and measurement result values, etc.
  • using one or more specific values also allows one or more non-valid values to be used so that UE's that do not support this technology may still respond as defined in legacy RRC procedures, e.g., by a failure message to the eNB as a response to the measurement configuration message.
  • CSFB technology described may further take the form of a computer program product stored on a non-transitory computer-readable medium providing program code for use by or in connection with a computer or any instruction execution system.
  • a computer readable medium includes any apparatus that can contain or store the program for use by or in connection with the instruction execution system, apparatus, or device.
  • the medium can be for example an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system (or apparatus or device).
  • Examples of a computer-readable medium include a semiconductor or solid state memory, magnetic tape, a removable computer diskette, a RAM, a ROM, a rigid magnetic disk and an optical disk. Current examples of optical disks include CD-read only memory (“CD-ROM”), CD-read/write (“CD-R/W”), and DVD.

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

Abstract

La présente invention concerne un équipement utilisateur (UE) (10) en communication avec un premier réseau de service à commutation de paquets par l'intermédiaire d'une première station radio fixe (24), cet équipement détectant une demande ou un besoin de service à commutation de circuits. En réponse, l'UE génère un rapport de mesure et l'envoie à une première station radio fixe. La première station fixe envoie un message, par exemple, un message de libération, donnant à l'UE l'indication d'établir une connexion pour recevoir le service à commutation de circuits d'un second réseau de service à commutation de circuits par l'intermédiaire d'une seconde station radio fixe, ce que fait l'UE. Avantageusement, le message (de libération) est envoyé pour initier une procédure de repli à commutation de circuits sans avoir à demander la permission d'un nœud de réseau central dans le premier réseau de service à commutation de paquets.
PCT/SE2012/050696 2011-07-20 2012-06-21 Repli à commutation de circuits pour une radio mobile Ceased WO2013012371A1 (fr)

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Cited By (9)

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WO2014117364A1 (fr) * 2013-01-31 2014-08-07 Qualcomm Incorporated Repli à commutation de circuits (csfb) pour une radio à double rat
WO2014131536A1 (fr) * 2013-02-28 2014-09-04 Intel Mobile Communications GmbH Dispositif terminal de communication, dispositif de communication, serveur de réseau de communication et procédé de commande
WO2015198095A1 (fr) * 2014-06-25 2015-12-30 Telefonaktiebolaget L M Ericsson (Publ) Repli de réseau d'accès radio
US9351209B2 (en) 2011-08-01 2016-05-24 Intel Corporation Opportunistic device-to-device communication
WO2016060502A3 (fr) * 2014-10-15 2016-06-09 엘지전자 주식회사 Procédés et dispositifs permettant de mettre en œuvre un repli rapide dans un système d'accès sans fil prenant en charge des ondes millimétriques (mmwave)
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CN112135307A (zh) * 2016-09-30 2020-12-25 华为技术有限公司 一种电话响应的方法和终端
CN112135307B (zh) * 2016-09-30 2022-06-10 华为技术有限公司 一种电话响应的方法和终端

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