[go: up one dir, main page]

WO2014117364A1 - Repli à commutation de circuits (csfb) pour une radio à double rat - Google Patents

Repli à commutation de circuits (csfb) pour une radio à double rat Download PDF

Info

Publication number
WO2014117364A1
WO2014117364A1 PCT/CN2013/071203 CN2013071203W WO2014117364A1 WO 2014117364 A1 WO2014117364 A1 WO 2014117364A1 CN 2013071203 W CN2013071203 W CN 2013071203W WO 2014117364 A1 WO2014117364 A1 WO 2014117364A1
Authority
WO
WIPO (PCT)
Prior art keywords
rat
network
rat network
call
service
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/CN2013/071203
Other languages
English (en)
Inventor
Xipeng Zhu
Reza Shahidi
Masato Kitazoe
Miguel Griot
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.)
Qualcomm Inc
Original Assignee
Qualcomm Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Qualcomm Inc filed Critical Qualcomm Inc
Priority to PCT/CN2013/071203 priority Critical patent/WO2014117364A1/fr
Publication of WO2014117364A1 publication Critical patent/WO2014117364A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/12—Inter-network notification
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H04W60/005—Multiple registrations, e.g. multihoming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections

Definitions

  • aspects of the present disclosure relate generally to wireless communications, and more particularly, to techniques for dual radio circuit- switched fallback.
  • Wireless communication networks are widely deployed to provide various communication content such as voice, video, packet data, messaging, broadcast, etc. These wireless networks may be multiple-access networks capable of supporting multiple users by sharing the available network resources. Examples of such multiple- access networks include code division multiple access (CDMA) networks, time division multiple access (TDMA) networks, frequency division multiple access (FDMA) networks, orthogonal FDMA (OFDMA) networks, and single-carrier FDMA (SC- FDMA) networks.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDMA orthogonal FDMA
  • SC- FDMA single-carrier FDMA
  • a user equipment may be located within the coverage of multiple wireless networks, which may support different communication services.
  • a suitable wireless network may be selected to serve the UE based on one or more criteria.
  • the selected wireless network may be unable to provide a desired communication service (e.g., voice service) for the UE.
  • a set of procedures may then be performed to redirect the UE to another wireless network (e.g., 2G, 3G or non-LTE 4G) that can provide the desired communication service.
  • Certain aspects of the present disclosure provide a method for wireless communications by a user equipment (UE) capable of concurrent communications on a first radio access technology (RAT) network for circuit-switched (CS) service and a second RAT network for packet switched (PS) service.
  • the method generally includes registering for both CS and PS service on the second RAT network, camping on the second RAT network and monitoring for CS paging from the second RAT network while radio circuitry for communicating in the first RAT network is powered down, powering on the radio circuitry to perform a CS call, performing the CS call while maintaining a connection with the second RAT network, and powering back down the radio circuitry after completion of the CS call.
  • RAT radio access technology
  • PS packet switched
  • Certain aspects of the present disclosure provide a method for wireless communications with a user equipment (UE) capable of concurrent communications on a first radio access technology (RAT) network for circuit- switched (CS) service and a second RAT network for packet switched (PS) service.
  • the method generally includes performing combined registering of the UE for both CS service and PS service on the second RAT network, receiving a page from second RAT network for the UE to perform a CS call in the first RAT network, and providing the UE with information regarding the first RAT network to assist the UE in selecting a suitable cell and camping on the cell in the first RAT to perform the CS call.
  • RAT radio access technology
  • PS packet switched
  • Certain aspects of the present disclosure provide an apparatus for wireless communications by a user equipment (UE) capable of concurrent communications on a first radio access technology (RAT) network for circuit-switched (CS) service and a second RAT network for packet switched (PS) service.
  • the apparatus generally includes means for registering for both CS and PS service on the second RAT network, means for camping on the second RAT network and monitoring for CS paging from the second RAT network while radio circuitry for communicating in the first RAT network is powered down, means for powering on the radio circuitry to perform a CS call, means for performing the CS call while maintaining a connection with the second RAT network, and means for powering back down the radio circuitry after completion of the CS call.
  • RAT radio access technology
  • PS packet switched
  • Certain aspects of the present disclosure provide an apparatus for wireless communications by a user equipment (UE) capable of concurrent communications on a first radio access technology (RAT) network for circuit-switched (CS) service and a second RAT network for packet switched (PS) service.
  • the apparatus generally includes at least one processor configured to register for both CS and PS service on the second RAT network, camp on the second RAT network and monitor for CS paging from the second RAT network while radio circuitry for communicating in the first RAT network is powered down, power on the radio circuitry to perform a CS call, perform the CS call while maintaining a connection with the second RAT network, and power back down the radio circuitry after completion of the CS call.
  • the apparatus also includes a memory coupled with the at least one processor.
  • Certain aspects of the present disclosure provide a program product comprising a computer readable medium having instructions stored thereon, the instructions generally executable by one or more processors for wireless communications by a user equipment (UE) capable of concurrent communications on a first radio access technology (RAT) network for circuit-switched (CS) service and a second RAT network for packet switched (PS) service.
  • UE user equipment
  • RAT radio access technology
  • PS packet switched
  • the instructions generally include registering for both CS and PS service on the second RAT network, camping on the second RAT network and monitoring for CS paging from the second RAT network while radio circuitry for communicating in the first RAT network is powered down, powering on the radio circuitry to perform a CS call, performing the CS call while maintaining a connection with the second RAT network, and powering back down the radio circuitry after completion of the CS call.
  • Certain aspects of the present disclosure provide an apparatus for wireless communications with a user equipment (UE) capable of concurrent communications on a first radio access technology (RAT) network for circuit- switched (CS) service and a second RAT network for packet switched (PS) service.
  • the apparatus generally includes means for performing combined registering of the UE for both CS service and PS service on the second RAT network, means for receiving a page from the second RAT network for the UE to perform a CS call in the first RAT network, and means for providing the UE with information regarding the first RAT network to assist the UE in selecting a suitable cell and camping on the cell in the first RAT to perform the CS call.
  • RAT radio access technology
  • PS packet switched
  • Certain aspects of the present disclosure provide an apparatus for wireless communications with a user equipment (UE) capable of concurrent communications on a first radio access technology (RAT) network for circuit- switched (CS) service and a second RAT network for packet switched (PS) service.
  • the apparatus generally includes at least one processor configured to perform combined registering of the UE for both CS service and PS service on the second RAT network, receive a page from the second RAT network for the UE to perform a CS call in the first RAT network, and provide the UE with information regarding the first RAT network to assist the UE in selecting a suitable cell and camping on the cell in the first RAT to perform the CS call.
  • the apparatus also includes a memory coupled with the at least one processor.
  • Certain aspects of the present disclosure provide a program product comprising a computer readable medium having instructions stored thereon, the instructions generally executable by one or more processors for for wireless communications with a user equipment (UE) capable of concurrent communications on a first radio access technology (RAT) network for circuit- switched (CS) service and a second RAT network for packet switched (PS) service.
  • the instructions generally include performing combined registering of the UE for both CS service and PS service on the second RAT network, receiving a page from the second RAT network for the UE to perform a CS call in the first RAT network, and providing the UE with information regarding the first RAT network to assist the UE in selecting a suitable cell and camping on the cell in the first RAT to perform the CS call.
  • FIG. 1 illustrates an exemplary deployment in which multiple wireless networks have overlapping coverage.
  • FIG. 2 illustrates a block diagram of a user equipment (UE) and other network entities.
  • UE user equipment
  • FIG. 3 illustrates an example call flow of circuit-switch fallback (CSFB) when a user equipment (UE) makes a mobile originated (MO) call, according to certain aspects of the present disclosure.
  • FIG. 4 illustrates an example call flow of CSFB when a UE receives a mobile terminated (MT) call, according to certain aspects of the present disclosure.
  • FIG. 5 illustrates an example call of CSFB procedure when a UE receives a MT call, according to certain aspects of the present disclosure.
  • FIG. 6 illustrates example call flow for a RAN based solution for Dual Radio CSFB, according to certain aspects of the present disclosure.
  • FIG. 7 illustrates example call flow for a MME based solution for Dual Radio SCFB, according to certain aspects of the present disclosure.
  • FIG. 8 illustrates example call flow for a MME based solution for Dual Radio SCFB, according to certain aspects of the present disclosure.
  • FIG. 9 illustrates example operations for wireless communications by a UE, in accordance with certain aspects of the present disclosure illustrates.
  • FIG. 10 illustrates example operations for wireless communications with a UE, according to certain aspects of the present disclosure.
  • CDMA code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OFDM A orthogonal FDMA
  • SC-FDMA single carrier FDMA
  • RAT radio access technology
  • UTRA universal terrestrial radio access
  • WCDMA wideband CDMA
  • cdma2000 covers IS-2000, IS-95 and IS-856 standards.
  • IS-2000 is also referred to as lx radio transmission technology (lxRTT), CDMA2000 IX, etc.
  • a TDMA network may implement a RAT such as global system for mobile communications (GSM), enhanced data rates for GSM evolution (EDGE), or GSM/EDGE radio access network (GERAN).
  • GSM global system for mobile communications
  • EDGE enhanced data rates for GSM evolution
  • GERAN GSM/EDGE radio access network
  • An OFDMA network may implement a RAT such as evolved UTRA (E-UTRA), ultra mobile broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM.RTM., etc.
  • E-UTRA evolved UTRA
  • UMB ultra mobile broadband
  • Wi-Fi IEEE 802.11
  • WiMAX WiMAX
  • IEEE 802.20 Flash-OFDM.RTM.
  • UTRA and E- UTRA are part of universal mobile telecommunication system (UMTS).
  • 3GPP long- term evolution (LTE) and LTE- Advanced (LTE- A) are new releases of UMTS that use E-U
  • UTRA, E-UTRA, UMTS, LTE, LTE- A and GSM are described in documents from an organization named "3rd Generation Partnership Project” (3GPP).
  • cdma2000 and UMB are described in documents from an organization named “3rd Generation Partnership Project 2" (3GPP2).
  • the techniques described herein may be used for the wireless networks and RATs mentioned above as well as other wireless networks and RATs.
  • Circuit- switched fallback is a technique to deliver voice-services to a mobile, when the mobile is camped in a long-term evolution (LTE) network. This may be required when the LTE network does not support voice services natively.
  • LTE long-term evolution
  • the LTE network and a 3GPP CS network e.g., UMTS or GSM
  • the UE may register with the 3GPP CS network while on the LTE network by exchanging messages with the 3GPP CS core network over the tunnel interface.
  • FIG. 1 shows an exemplary deployment in which multiple wireless networks have overlapping coverage.
  • An evolved universal terrestrial radio access network (E- UTRAN) 120 may support LTE and may include a number of evolved Node Bs (eNBs) 122 and other network entities that can support wireless communication for user equipments 110 (UEs). Each eNB 122 may provide communication coverage for a particular geographic area.
  • the term "cell" can refer to a coverage area of an eNB and/or an eNB subsystem serving this coverage area.
  • a serving gateway (S-GW) 124 may communicate with E-UTRAN 120 and may perform various functions such as packet routing and forwarding, mobility anchoring, packet buffering, initiation of network-triggered services, etc.
  • a mobility management entity (MME) 126 may communicate with E-UTRAN 120 and serving gateway 124 and may perform various functions such as mobility management, bearer management, distribution of paging messages, security control, authentication, gateway selection, etc.
  • the network entities in LTE are described in 3GPP TS 36.300, entitled “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E- UTRAN); Overall description,” which is publicly available.
  • a radio access network (RAN) 130 may support GSM and may include a number of base stations 132 and other network entities that can support wireless communication for UEs.
  • a mobile switching center (MSC) 134 may communicate with the RAN 130 and may support voice services, provide routing for circuit- switched calls, and perform mobility management for UEs located within the area served by MSC 134.
  • an inter- working function (IWF) 140 may facilitate communication between MME 126 and MSC 134 (e.g., for lxCSFB).
  • E-UTRAN 120, serving gateway 124, and MME 126 may be part of an LTE network 102.
  • RAN 130 and MSC 134 may be part of a GSM network 104.
  • FIG. 1 shows only some network entities in the LTE network 102 and the GSM network 104.
  • the LTE and GSM networks may also include other network entities that may support various functions and services.
  • any number of wireless networks may be deployed in a given geographic area.
  • Each wireless network may support a particular RAT and may operate on one or more frequencies.
  • a RAT may also be referred to as a radio technology, an air interface, etc.
  • a frequency may also be referred to as a carrier, a frequency channel, etc.
  • Each frequency may support a single RAT in a given geographic area in order to avoid interference between wireless networks of different RATs.
  • a UE 110 may be stationary or mobile and may also be referred to as a mobile station, a terminal, an access terminal, a subscriber unit, a station, etc.
  • UE 110 may be a cellular phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, etc.
  • PDA personal digital assistant
  • WLL wireless local loop
  • UE 110 may search for wireless networks from which it can receive communication services. If more than one wireless network is detected, then a wireless network with the highest priority may be selected to serve UE 110 and may be referred to as the serving network.
  • UE 110 may perform registration with the serving network, if necessary.
  • UE 110 may then operate in a connected mode to actively communicate with the serving network. Alternatively, UE 110 may operate in an idle mode and camp on the serving network if active communication is not required by UE 110.
  • UE 110 may be located within the coverage of cells of multiple frequencies and/or multiple RATs while in the idle mode.
  • UE 110 may select a frequency and a RAT to camp on based on a priority list.
  • This priority list may include a set of frequencies, a RAT associated with each frequency, and a priority of each frequency.
  • the priority list may include three frequencies X, Y and Z. Frequency X may be used for LTE and may have the highest priority, frequency Y may be used for GSM and may have the lowest priority, and frequency Z may also be used for GSM and may have medium priority.
  • the priority list may include any number of frequencies for any set of RATs and may be specific for the UE location.
  • UE 110 may be configured to prefer LTE, when available, by defining the priority list with LTE frequencies at the highest priority and with frequencies for other RATs at lower priorities, e.g., as given by the example above.
  • UE 110 may operate in the idle mode as follows. UE 110 may identify all frequencies/RATs on which it is able to find a "suitable” cell in a normal scenario or an "acceptable” cell in an emergency scenario, where "suitable” and “acceptable” are specified in the LTE standards. UE 110 may then camp on the frequency/RAT with the highest priority among all identified frequencies/RATs. UE 110 may remain camped on this frequency/RAT until either (i) the frequency/RAT is no longer available at a predetermined threshold or (ii) another frequency/RAT with a higher priority reaches this threshold.
  • UE 110 may be able to receive packet-switched (PS) data services from LTE network 102 and may camp on the LTE network while in the idle mode.
  • PS packet-switched
  • LTE network 102 may have limited or no support for voice-over- Internet protocol (VoIP), which may often be the case for early deployments of LTE networks. Due to the limited VoIP support, UE 110 may be transferred to another wireless network of another RAT for voice calls. This transfer may be referred to as circuit- switched (CS) fallback.
  • VoIP voice-over- Internet protocol
  • UE 110 may be transferred to a RAT that can support voice service such as IxRTT, WCDMA, GSM, etc.
  • UE 110 may initially become connected to a wireless network of a source RAT (e.g., LTE) that may not support voice service.
  • the UE may originate a voice call with this wireless network and may be transferred through higher-layer signaling to another wireless network of a target RAT that can support the voice call.
  • the higher-layer signaling to transfer the UE to the target RAT may be for various procedures, e.g., connection release with redirection, PS handover, etc.
  • FIG. 2 shows a block diagram of a design of UE 110, eNB 122, and MME 126 in FIG. 1.
  • an encoder 212 may receive traffic data and signaling messages to be sent on the uplink.
  • Encoder 212 may process (e.g., format, encode, and interleave) the traffic data and signaling messages.
  • a modulator (Mod) 214 may further process (e.g., symbol map and modulate) the encoded traffic data and signaling messages and provide output samples.
  • a transmitter (TMTR) 222 may condition (e.g., convert to analog, filter, amplify, and frequency upconvert) the output samples and generate an uplink signal, which may be transmitted via an antenna 224 to eNB 122.
  • antenna 224 may receive downlink signals transmitted by eNB 122 and/or other eNBs/base stations.
  • a receiver (RCVR) 226 may condition (e.g., filter, amplify, frequency downconvert, and digitize) the received signal from antenna 224 and provide input samples.
  • a demodulator (Demod) 216 may process (e.g., demodulate) the input samples and provide symbol estimates.
  • a decoder 218 may process (e.g., deinterleave and decode) the symbol estimates and provide decoded data and signaling messages sent to UE 110.
  • Encoder 212, modulator 214, demodulator 216, and decoder 218 may be implemented by a modem processor 210.
  • a controller/processor 230 may direct the operation at UE 110. Controller/processor 230 may also perform or direct other processes for the techniques described herein. Controller/processor 230 may also perform or direct the processing by UE 110 in FIGs. 3 and 4.
  • Memory 232 may store program codes and data for UE 110. Memory 232 may also store a priority list and configuration information.
  • a transmitter/receiver 238 may support radio communication with UE 110 and other UEs.
  • a controller/processor 240 may perform various functions for communication with the UEs.
  • the uplink signal from UE 110 may be received via an antenna 236, conditioned by receiver 238, and further processed by controller/processor 240 to recover the traffic data and signaling messages sent by UE 110.
  • traffic data and signaling messages may be processed by controller/processor 240 and conditioned by transmitter 238 to generate a downlink signal, which may be transmitted via antenna 236 to UE 110 and other UEs.
  • Controller/processor 240 may also perform or direct other processes for the techniques described herein. Controller/processor 240 may also perform or direct the processing by eNB 122 in FIGS. 3 and 4.
  • Memory 242 may store program codes and data for the base station.
  • a communication (Comm) unit 244 may support communication with MME 126 and/or other network entities.
  • a controller/processor 250 may perform various functions to support communication services for UEs. Controller/processor 250 may also perform or direct the processing by MME 126 in FIGS. 3 and 4. Memory 252 may store program codes and data for MME 126. A communication unit 254 may support communication with other network entities.
  • FIG. 2 shows simplified designs of UE 110, eNB 122, and MME 126.
  • each entity may include any number of transmitters, receivers, processors, controllers, memories, communication units, etc.
  • Other network entities may also be implemented in similar manner.
  • FIG. 3 illustrates an example call flow 300 of CSFB when a UE 110 (e.g., having EUTRAN/UTRAN/GERAN protocol support) makes a mobile-originated (MO) call, according to certain aspects of the present disclosure.
  • a UE 110 e.g., having EUTRAN/UTRAN/GERAN protocol support
  • the UE 110 may need to fallback to a lx network connected to the MSC 134 in order to make the MO call.
  • the call setup procedure may begin at 302 where the UE 110 may initiate a non access stratum (NAS) extended service request (ESR).
  • ESR non access stratum
  • the UE may receive CS RAT candidates from a measurement report.
  • NAS non access stratum
  • ESR non access stratum
  • the UE may receive CS RAT candidates from a measurement report.
  • the LTE network 102 may assist the UE 110 in the mobility procedure in a network assisted cell change (NACC). For example, if an interface between the MSC 134 and the mobility management entity (MME) 126 is down, the LTE network 102 may inform the UE 110 to retry the call setup after a set period. At 308, the UE may receive a mobility command from the LTE network 102 indicating the target RAT/band/channel the UE 110 may need to tune to in order to find CS services and in order to continue with the call setup procedure.
  • NACC network assisted cell change
  • FIG. 4 illustrates an example call flow 400 of CSFB when a UE 110 receives a mobile-terminated (MT) call, according to certain aspects of the present disclosure. Operations may be similar to those described in FIG. 3, however, the UE 110 may initiate the call setup procedure after receiving a lx page at 402 (CS SERVICE NOTIFICATION).
  • the MSC 134 may deliver the lx page to the UE 110 (e.g., forward the page through SGs interface to MME 126).
  • the lx page may comprise caller line identification information.
  • CSFB Packet Control Function
  • CSFB Circuit Switching
  • CMCC China Mobile Communications Corporation
  • SGLTE simultaneous GSM and LTE
  • Dual Radio CSFB provides concurrent PS and CS.
  • CSFB For CSFB to GSM, the GSM is turned on and CS is transferred to GSM.
  • PS is kept in LTE to avoid CSFB impact to PS service. This overcomes the power consumption problem of dual radio as well as the impact to PS service of CSFB.
  • Dual Radio CSFB may operate single standby on LTE.
  • the UE 110 is combined registered to Evolved Packet System (EPS)/International Mobile Subscriber Identity (IMSI) and camps only on LTE 102.
  • EPS Evolved Packet System
  • IMSI International Mobile Subscriber Identity
  • the GSM module is off.
  • the UE 110 turns GSM module on only when the UE 110 needs to perform a CS call.
  • the UE 110 may select a suitable GSM cell—which may take, for example, 600 ms.
  • the UE 110 reads the GSM system information and camps on the GSM cell, for example, for 2000 ms.
  • the UE 110 may then initiate the CS call (e.g., a Mobile-Originated (MO) call).
  • the UE 110 turns the GSM module off.
  • a suitable GSM cell which may take, for example, 600 ms.
  • the UE 110 reads the GSM system information and camps on the GSM cell, for example, for 2000 ms.
  • the UE 110 may then initiate the CS call (e.g., a Mobile-Originated (MO) call).
  • MO Mobile-Originated
  • the UE 110 may then perform combined Tracking Area Update (TAU) in LTE after the CS call is performed.
  • LAU Location Area Update
  • TAU Tracking Area Update
  • Dual Radio CSFB One drawback of Dual Radio CSFB is longer call setup time. Primarily, the 2000 ms for the UE 110 to read GSM system information before performing the CS call. Also, the UE 110 selects the GSM cell blindly. In some embodiments, the UE receives a GSM frequency list from the eNB 122. The UE 110 may search GSM carriers in LTE SUB7 first, to mitigate the blind selection.
  • FIG. 5 illustrates a conventional Mobile-Terminated (MT) CSFB procedure, according to certain embodiments of the present disclosure.
  • the UE 110 receives CS paging from LTE 102.
  • the UE 110 then turns on the GSM module and selects a suitable GSM cell—which may take, for example, 600 ms.
  • the UE 110 then reads GSM system information and camps on the GSM cell, for example, for 2000 ms.
  • the UE 110 then responds to CS Paging on GSM and performs a CS call.
  • the UE 110 then turn off the GSM module after the CS call.
  • the UE 110 may then perform combined TAU in LTE after the CS call.
  • the MME 126 responds to the MSC 134 for the MSC 134 to stop paging.
  • the MSC 134 may use the Signaling Gateways (SGs) Service Request message containing the idle mode indication as a trigger to inform the user that the call is progressing.
  • SGs Signaling Gateways
  • MT call procedure for Dual Radio CSFB has the drawback of longer call setup time.
  • MSC 134 may re -page the UE 110 via SGs.
  • the UE 110 typically requires around 3 seconds from received paging to respond to CS paging on GSM.
  • the SGs Paging guard timer, Timer Ts5 may expire before the UE paging on GSM responds to the CS paging from LTE 102. Prolonging the Ts5 may mitigate or avoid this issue.
  • FIG. 6 illustrates an example call flow for a RAN based solution for Dual Radio CSFB.
  • the UE 110 may send an Extended Service Request and may receive the GSM carrier frequency list and GSM system info from the eNB 122, in a Dual Radio Redirection message. If the eNB 122 indicates dual radio redirection, then, referring back to to FIG. 3, the eNB 112 does not send SI UE Context Release Request to the MME 126. The eNB 122 does not release the UE context and the UE 110 does not release Radio Resource Control (RRC) connection with LTE 102. Because the Context Release Request was not sent, referring again to FIG.
  • RRC Radio Resource Control
  • Suspend, Suspend Request/Response, and Update Bearer(s) steps are also not performed.
  • the UE 110 if the UE 110 performed LAU during CSFB or the CS call, the UE performs combined TAU when the GSM module is turned off after the CS call.
  • FIG. 7 illustrates an example call flow for a MME based solution for Dual Radio CSFB, according to certain aspects of the present disclosure.
  • MME 126 may indicate whether dual radio CSFB is supported by Attach/TAU accept message.
  • the UE 110 may receive paging from the MME 126, sent by the MME 126 in response to a paging request from the MSC 134, and the UE 110 may send an Extended Service Request (ESR) to the MME 126 in response to a MT CS call.
  • ESR Extended Service Request
  • the serving E-UTRAN cell ID may be included in the S1AP message carrying the ESR.
  • a new "service type" may be defined in the ESR to request dual radio CSFB.
  • the MME 126 may receive the ESR and send a Service Request to MSC 134 to stop paging. The MME 126 may then send an NAS Extended Service Accept message to the UE with GSM system information. In some embodiments, in order avoid adding new NAS message, Downlink Generic NAS Transport may be used instead. The Generic message container may be used to deliver GSM information.
  • FIG. 8 illustrates an example call flow for a MME based solution for Dual Radio CSFB, according to certain aspects of the present disclosure.
  • MME 126 if the UE 110 is in connected mode, when MME 126 receives CS paging, MME 126 sends CS paging and GSM system information to UE 110 in the NAS CS Service Notification message.
  • FIG. 9 illustrates example operations 900 for wireless communications by a UE, in accordance with certain aspects of the present disclosure.
  • the operations 900 may be performed, for example, by UE 110.
  • the UE 110 registers for both CS and PS service on a second RAT network.
  • the UE 110 camps on the second RAT and monitors for CS paging from the second RAT while radio circuitry for communicating in the first RAT network is powered down.
  • the UE 110 powers back on the radio circuitry to perform a CS call.
  • the UE 110 performs the CS call while maintaining a connection with the second RAT network.
  • the UE 110 powers back down the radio circuitry after completion of the CS call.
  • FIG. 10 illustrates example operations 1000 for wireless communications with a UE, in accordance with certain aspects of the present disclosure.
  • the operations 1000 may be performed, for example, by a network.
  • the network performs combined registering of the UE for both CS service and PS service on the second RAT network.
  • the network receives a page from the second RAT network for the UE to perform a CS call in the first RAT network.
  • the network provides the UE with information regarding the first RAT network to assist the UE in selecting a suitable cell and camping on the cell in the first RAT to perform the CS call.
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • EV-DO Evolution-Data Optimized
  • UMB Ultra Mobile Broadband
  • Wi-Fi Wi-Fi
  • WiMAX WiMAX
  • IEEE 802.20 Ultra- Wideband
  • Bluetooth Bluetooth
  • the actual telecommunication standard, network architecture, and/or communication standard employed will depend on the specific application and the overall design constraints imposed on the system.
  • processors have been described in connection with various apparatuses and methods. These processors may be implemented using electronic hardware, computer software, or any combination thereof. Whether such processors are implemented as hardware or software will depend upon the particular application and overall design constraints imposed on the system.
  • a processor, any portion of a processor, or any combination of processors presented in this disclosure may be implemented with a microprocessor, microcontroller, digital signal processor (DSP), a field-programmable gate array (FPGA), a programmable logic device (PLD), a state machine, gated logic, discrete hardware circuits, and other suitable processing components configured to perform the various functions described throughout this disclosure.
  • DSP digital signal processor
  • FPGA field-programmable gate array
  • PLD programmable logic device
  • the functionality of a processor, any portion of a processor, or any combination of processors presented in this disclosure may be implemented with software being executed by a microprocessor, microcontroller, DSP or other suitable platform.
  • Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • the software may reside on a computer-readable medium.
  • a computer- readable medium may include, by way of example, memory such as a magnetic storage device (e.g., hard disk, floppy disk, magnetic strip), an optical disk (e.g., compact disc (CD), digital versatile disc (DVD)), a smart card, a flash memory device (e.g., card, stick, key drive), random access memory (RAM), read only memory (ROM), programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), a register, or a removable disk.
  • memory is shown separate from the processors in the various aspects presented throughout this disclosure, the memory may be internal to the processors (e.g., cache or register).
  • Computer-readable media may be embodied in a computer-program product.
  • a computer-program product may include a computer-readable medium in packaging materials.

Landscapes

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

Abstract

Dans certains de ses modes de réalisation, la présente invention se rapporte à un procédé de communication sans fil. Ledit procédé est mis en œuvre par un équipement d'utilisateur (UE) qui est apte à exécuter en même temps des communications sur un réseau qui utilise une première technologie d'accès radio (RAT) pour exécuter un service à commutation de circuits (CS) et sur un réseau qui utilise une seconde RAT pour exécuter un service à commutation de paquets (PS). D'une façon générale, le procédé selon l'invention consiste : à s'enregistrer pour les deux services, CS et PS, sur le réseau qui utilise la seconde RAT ; à camper sur le réseau qui utilise la seconde RAT et à surveiller une opération de radiomessagerie CS à partir du réseau qui utilise la seconde RAT tandis que l'alimentation d'un montage de circuits radio pour une communication dans le réseau qui utilise la première RAT est réduite ; à alimenter le montage de circuits radio pour exécuter un appel CS ; à exécuter l'appel CS tout en maintenant une connexion avec le réseau qui utilise la seconde RAT ; et à réduire à nouveau l'alimentation du montage de circuits radio une fois que l'appel CS a été exécuté.
PCT/CN2013/071203 2013-01-31 2013-01-31 Repli à commutation de circuits (csfb) pour une radio à double rat Ceased WO2014117364A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2013/071203 WO2014117364A1 (fr) 2013-01-31 2013-01-31 Repli à commutation de circuits (csfb) pour une radio à double rat

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2013/071203 WO2014117364A1 (fr) 2013-01-31 2013-01-31 Repli à commutation de circuits (csfb) pour une radio à double rat

Publications (1)

Publication Number Publication Date
WO2014117364A1 true WO2014117364A1 (fr) 2014-08-07

Family

ID=51261418

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2013/071203 Ceased WO2014117364A1 (fr) 2013-01-31 2013-01-31 Repli à commutation de circuits (csfb) pour une radio à double rat

Country Status (1)

Country Link
WO (1) WO2014117364A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016028570A1 (fr) * 2014-08-19 2016-02-25 Qualcomm Incorporated Commutation dynamique de csfb à sglte afin d'améliorer le débit de données
CN105873188A (zh) * 2015-12-04 2016-08-17 乐视移动智能信息技术（北京）有限公司 一种网络选择方法和手机终端
CN112514461A (zh) * 2018-06-25 2021-03-16 诺基亚技术有限公司 用于紧急呼叫的装置、方法和计算机程序
WO2025113270A1 (fr) * 2023-11-27 2025-06-05 维沃移动通信有限公司 Procédé d'exécution d'opération, procédé d'envoi d'informations, appareil et dispositif associé

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101222765A (zh) * 2008-01-24 2008-07-16 中兴通讯股份有限公司 电路域回落的控制方法、系统、及装置
CN102308629A (zh) * 2011-07-18 2012-01-04 华为技术有限公司 一种语音回落的方法及设备
CN102415162A (zh) * 2009-05-04 2012-04-11 捷讯研究有限公司 用于移动台识别无线接入技术的系统和方法
WO2013012371A1 (fr) * 2011-07-20 2013-01-24 Telefonaktiebolaget L M Ericsson (Publ) Repli à commutation de circuits pour une radio mobile

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101222765A (zh) * 2008-01-24 2008-07-16 中兴通讯股份有限公司 电路域回落的控制方法、系统、及装置
CN102415162A (zh) * 2009-05-04 2012-04-11 捷讯研究有限公司 用于移动台识别无线接入技术的系统和方法
CN102308629A (zh) * 2011-07-18 2012-01-04 华为技术有限公司 一种语音回落的方法及设备
WO2013012371A1 (fr) * 2011-07-20 2013-01-24 Telefonaktiebolaget L M Ericsson (Publ) Repli à commutation de circuits pour une radio mobile

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016028570A1 (fr) * 2014-08-19 2016-02-25 Qualcomm Incorporated Commutation dynamique de csfb à sglte afin d'améliorer le débit de données
CN105873188A (zh) * 2015-12-04 2016-08-17 乐视移动智能信息技术（北京）有限公司 一种网络选择方法和手机终端
CN112514461A (zh) * 2018-06-25 2021-03-16 诺基亚技术有限公司 用于紧急呼叫的装置、方法和计算机程序
WO2025113270A1 (fr) * 2023-11-27 2025-06-05 维沃移动通信有限公司 Procédé d'exécution d'opération, procédé d'envoi d'informations, appareil et dispositif associé

Similar Documents

Publication Publication Date Title
EP2617231B1 (fr) Système et procédé pour améliorer la réalisation du repli sur commutation de circuits
US9516557B2 (en) Differentiated VoLTE based on dual radio and DRVCC
EP2815614B1 (fr) Traitement de reprise amélioré après changement d'accord
US8478269B2 (en) Method and apparatus to enable a UE to return to a wireless network after failure to obtain service
US9131418B2 (en) Reading and caching of system information to reduce call setup delay
EP2769584B1 (fr) Transmission de demande de service étendu pour réduire le retard de repli sur commutation de circuits
US20120064885A1 (en) System and method of improving circuit-switched fallback user experience
CN104067666B (zh) 用于管理多无线电设备中的移动性的方法和装置
US20130183981A1 (en) Methods and apparatus for improving cell redirection search time
WO2014117364A1 (fr) Repli à commutation de circuits (csfb) pour une radio à double rat
US20210037429A1 (en) Techniques for radio cell reselection

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 13874196

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 13874196

Country of ref document: EP

Kind code of ref document: A1