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WO2022039496A1 - Procédés et systèmes pour réduire un temps d'établissement d'appel dans un équipement utilisateur 5g - Google Patents

Procédés et systèmes pour réduire un temps d'établissement d'appel dans un équipement utilisateur 5g Download PDF

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Publication number
WO2022039496A1
WO2022039496A1 PCT/KR2021/010956 KR2021010956W WO2022039496A1 WO 2022039496 A1 WO2022039496 A1 WO 2022039496A1 KR 2021010956 W KR2021010956 W KR 2021010956W WO 2022039496 A1 WO2022039496 A1 WO 2022039496A1
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WIPO (PCT)
Prior art keywords
cell
timer
call
response
transmitting
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English (en)
Inventor
Aman Agarwal
Kailash Kumar Jha
Alok Kumar Jangid
Ravi Pandappa Kamaladinni
Sidhant JAIN
Rajeev NAYAN
Nipun BIDIKAR
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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Publication of WO2022039496A1 publication Critical patent/WO2022039496A1/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/1016—IP multimedia subsystem [IMS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/1046—Call controllers; Call servers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1069—Session establishment or de-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/65—Network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP]
    • 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]
    • H04W36/00226—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] wherein the core network technologies comprise IP multimedia system [IMS], e.g. single radio voice call continuity [SRVCC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Definitions

  • the present disclosure in general, relates to network procedures performed by User Equipment (UE), and, in particular, relates to network procedures performed by a UE for reducing a call set up time in a 5g user equipment.
  • UE User Equipment
  • the 5G or pre-5G communication system is also called a 'Beyond 4G Network' or a 'Post LTE System'.
  • the 5G communication system is considered to be implemented in higher frequency (mmWave) bands, e.g., 60GHz bands, so as to accomplish higher data rates.
  • mmWave e.g., 60GHz bands
  • MIMO massive multiple-input multiple-output
  • FD-MIMO Full Dimensional MIMO
  • array antenna an analog beam forming, large scale antenna techniques are discussed in 5G communication systems.
  • RANs Cloud Radio Access Networks
  • D2D device-to-device
  • CoMP Coordinated Multi-Points
  • FQAM Hybrid FSK and QAM Modulation
  • SWSC sliding window superposition coding
  • ACM advanced coding modulation
  • FBMC filter bank multi carrier
  • NOMA non-orthogonal multiple access
  • SCMA sparse code multiple access
  • the Internet which is a human centered connectivity network where humans generate and consume information
  • IoT Internet of Things
  • IoE Internet of Everything
  • sensing technology “wired/wireless communication and network infrastructure”, “service interface technology”, and “Security technology”
  • M2M Machine-to-Machine
  • MTC Machine Type Communication
  • IoT Internet technology services
  • IoT may be applied to a variety of fields including smart home, smart building, smart city, smart car or connected cars, smart grid, health care, smart appliances and advanced medical services through convergence and combination between existing Information Technology (IT) and various industrial applications.
  • IT Information Technology
  • 5G communication systems to IoT networks.
  • technologies such as a sensor network, Machine Type Communication (MTC), and Machine-to-Machine (M2M) communication may be implemented by beamforming, MIMO, and array antennas.
  • MTC Machine Type Communication
  • M2M Machine-to-Machine
  • Application of a cloud Radio Access Network (RAN) as the above-described Big Data processing technology may also be considered to be as an example of convergence between the 5G technology and the IoT technology.
  • RAN Radio Access Network
  • TAU Tracking Area Update
  • UE After Network triggers a redirection/handover to LTE for EPS Fallback, UE would trigger Tracking Area Update (TAU) procedure.
  • TAU procedure During TAU procedure, UE would send TAU request and start T3430 timer (15 secs). But due to various reasons (lower layer failures/ No response from Network etc), T3430 might timeout and TAU procedure might not be successful.
  • the present subject matter refers a method for reducing call setup time in a 5G UE.
  • the method includes initiating a Voice over New Radio (VoNR) call on a 5G cell
  • the method includes detecting an inability of the UE to support the VoNR call on the 5G cell.
  • the method includes initiating a procedure to fall back to a 4G cell for the VoNR call initiated on the 5G cell.
  • the method includes transmitting a first synchronization request to the 4G cell.
  • the method includes transmitting a second synchronization request to the 4G cell in response to detecting a failure to synchronize with the 4G cell upon transmitting the first synchronization request.
  • the method includes initiating a Circuit Switched (CS) call to continue the VoNR call upon detecting a failure to synchronize with the 4G cell in response to transmitting the second synchronization request.
  • CS Circuit Switched
  • the present subject matter refers a system for reducing call setup time in a 5G UE.
  • the system includes initiating, by the controller, a Voice over New Radio (VoNR) call on a 5G.
  • the system includes detecting, by the controller, an inability of the UE to support the VoNR call on the 5G cell.
  • the system includes initiating, by the controller, a procedure to fall back to a 4G cell for the VoNR call initiated on the 5G cell.
  • the system includes transmitting, by a communication unit, a first synchronization request to the 4G cell.
  • the system includes transmitting by the communication unit a second synchronization request to the 4G cell in response to detecting, by the controller, a failure to synchronize with the 4G cell upon transmitting the first synchronization request.
  • the system incudes initiating, by the controller, a Circuit Switched (CS) call to continue the VoNR call upon detecting a failure to synchronize with the 4G cell in response to transmitting the second
  • UE is capable of switching from the 5G cell to the 4G cell prior to expiry of a timer.
  • UE may be configured to switch from the 5G cell to a CS RAT mode in response to ascertaining a CS call is not triggered by an IMS client prior to expiry of a modified timer.
  • UE may be configured to switch from the 4G cell to the CS RAT in response to ascertaining that the 4G cell is prone to a call drop.
  • Fig. 1 illustrates a schematic block diagram depicting a method, for reducing call setup time in a 5G User Equipment (UE), in accordance with an embodiment of the present subject matter
  • UE User Equipment
  • Fig. 2 illustrates an operational flow diagram depicting a process for establishing a call through an SIP procedure by a UE, in accordance with an embodiment of the present subject matter
  • Fig. 3 illustrates an operational flow diagram depicting a process for initiating a call through a SIP procedure when the UE is in a NR-RRC connected mode, in accordance with an embodiment of the present subject matter
  • Fig. 4 illustrates an operational flow diagram depicting a process for initiating a VoLTE call based on a B1 measurement object related to a 4G cell measurement by a UE, in accordance with an embodiment of the present subject matter
  • Fig. 5 illustrates an operational flow diagram depicting a process for establishing a voice call upon receiving an error from a network at a UE, in accordance with an embodiment of the present subject matter
  • Fig. 6 illustrates an operational flow diagram depicting a process for initiating a voice call by a UE over a CS RAT upon initiation of a fallback, in accordance with an embodiment of the present subject matter
  • Fig. 7 is schematic block diagram of a diagram illustrating a configuration of a terminal in a wireless communication system according to an embodiment of the present subject matter.
  • AP/User initiates the call while UE is camped on NR
  • UE IMS triggers SIP procedure and starts a wait timer (ie TimerB which is generally 128 seconds or could be configurable as per different operators) for SIP procedure completion for Call Setup.
  • a wait timer ie TimerB which is generally 128 seconds or could be configurable as per different operators
  • v) UE would perform Neighbour LTE Cell Measurement and send Measurement Report for LTE cells to Network
  • Network would trigger Handover/Redirection to LTE.
  • UE would initiate TAU procedure and start following timers:
  • T3430 (15 secs): Started after sending TAU Request to Network. could be stopped after receiving TAU Accept/Reject from Network
  • T3411 (10 secs) : Started after receiving Lower Layer Failures/T3430 Timeout/TAU Reject etc. On expiry of T3411, TAU is sent again and T3430 is started. TAU could be tried upto 5 times until successful. So max delay for TAU procedure could be around 115-125 secs (for 5 retrials).
  • UE IMS may/may not indicate to AP/RIL to trigger call over CS (depending on reject cause like cause #503 etc) But there are many scenarios where either the call setup fails/is delayed due to TAU procedure fail/delay after TAU procedure is initiated or sometimes the call setup fails/is delayed due to TAU procedure could not be initiated because of No Handover/Redirection/Service Request Failures etc. All these factors would lead to Call Setup Delay and may even lead to Call fail if the stipulated IMS wait timer (TimerB) expires.
  • TimerB stipulated IMS wait timer
  • TAU Tracking Area Update
  • UE After Network triggers a redirection/handover to LTE for EPS Fallback, UE would trigger Tracking Area Update (TAU) procedure.
  • TAU procedure UE would send TAU request and start T3430 timer (15 secs). But due to various reasons (lower layer failures/ No response from Network etc), T3430 might timeout and TAU procedure might not be successful.
  • TAU procedure could be re-tried upto 5 times (with T3430 and T3411 (15+10 secs) running for each trial). This would lead to Call Setup Delay upto 115-125 secs (until TAU procedure is completed) and may even lead to Call fail if the stipulated IMS wait timer (TimerB) expires.
  • TimerB stipulated IMS wait timer
  • IMS Errors from Network like IMS Error Code 501, 502, 503 and other similar errors and there is no CS Retry from IMS side.
  • Fig. 1 illustrates a schematic block diagram 100 depicting a method, for reducing call setup time in a 5G User Equipment (UE), in accordance with an embodiment of the present subject matter.
  • the method may be implemented in a UE.
  • the method 100 may be implemented in the 5G UE.
  • the 5G UE may interchangeably be referred as the UE.
  • the method may be implemented in the UE.
  • the UE may be configured to operate in an New Radio- Stand Alone (NR-SA) mode.
  • NR-SA New Radio- Stand Alone
  • the method includes, initiating a Voice over New Radio (VoNR) call on a 5G cell.
  • the 5G cell may be connected to a 5G core.
  • the method includes, detecting an inability of the UE to support the VoNR call on the 5G cell.
  • the method includes, initiating a procedure to fall back to a 4G cell for the VoNR call initiated on the 5G cell.
  • the 4G cell may be connected to a 4G core.
  • the method includes, transmitting a first synchronization request to the 4G cell. Furthermore, the method may include, initiating a first modified T3430 timer in response to transmitting the first synchronization request.
  • the first modified T3430 timer may be initiated by the UE.
  • a duration of the first modified T3430 timer may be based on a number of network parameters.
  • the number of network parameters may include one or more of a Reference Signal Received Power (RSRP), a Reference Signal Received Quality (RSRQ), a signal-to-interference-plus-noise ratio (SINR) Downlink (DL) conditions, DL grants, Uplink (UL) conditions, and UL grants.
  • RSRP Reference Signal Received Power
  • RSRQ Reference Signal Received Quality
  • SINR signal-to-interference-plus-noise ratio
  • the duration associated with the first modified T3430 timer may be less than 15 seconds. In an embodiment, the duration associated with the first modified T3430 timer may be equal to 15 seconds.
  • the method 100 includes, detecting a failure to synchronize with the 4G cell in response to transmitting the first synchronization request.
  • the failure may be detected based on one or more of receiving no response from the 4G cell within the first modified T3430 timer, and receiving a reject message in response to the first synchronization request within the first modified T3430 timer.
  • the method 100 includes, transmitting a second synchronization request to the 4G cell. Furthermore, the method may include, initiating a second modified T3430 timer in response to transmitting the second synchronization request.
  • the second modified T3430 timer may be initiated by the UE.
  • a duration associated with the second modified T3430 timer associated with the second synchronization request maybe less than or equal to the first modified T3430 timer associated with the first synchronization request.
  • the second modified T3430 timer associated with the second synchronization request may be based on the number of network parameters and the first modified T3430 timer associated with the first synchronization request.
  • the method 100 includes, initiating a Circuit Switched (CS) call to continue the VoNR call.
  • the CS call may be initiated upon detecting a failure to synchronize with the 4G cell in response to transmitting the second synchronization request.
  • the failure may be detected based on one or more of receiving no response from the 4G cell within the second modified T3430 timer, and receiving a reject message in response to the second synchronization request within the second modified T3430 timer.
  • Fig. 2 illustrates an operational flow diagram 200 depicting a process for establishing a call through an SIP procedure by a UE, in accordance with an embodiment of the present subject matter.
  • the call may be one of a VoLTE call over 4G cell and a VoNR call over a 5G cell.
  • the 4G cell may be connected to a 4G core and the 5G cell may be connected to a 5G core.
  • the process may include triggering, by the UE, an SIP procedure for establishing the VoNR call.
  • the SIP procedure may be triggered in response to initiating the VoNR call.
  • the process may include determining that the UE is in a NR Radio Resource Control (RRC) idle mode. In an embodiment, the determination may be performed by the UE. Upon determining that the UE is in the NR RRC idle mode, the process may proceed towards step 206.
  • RRC Radio Resource Control
  • the process may include transmitting a "Service Request” message to the 5G cell.
  • the "Service Request” may be transmitted to move the UE from the NR RRC idle mode to an NR RRC connected mode to establish the VoNR call.
  • the "Service Request” may be transmitted by the UE to the 5G cell.
  • the process may include, initiating a timer B by the UE.
  • the timer B may be configured by a network.
  • the timer B may be initiated for waiting for a response associated with the "Service Request" transmitted by the UE to move from the NR RRC idle mode to the NR RRC connected mode and establish the VoNR call.
  • the process may include determining, whether the timer B is greater than a threshold amount of time or not.
  • the threshold amount of time may be configured by the UE.
  • the threshold amount of time may be equal to 5 seconds.
  • the process may proceed towards step 214.
  • the process may proceed towards step 212.
  • the determination may be performed by the UE.
  • the process may include determining a service request failure within the timer B.
  • the service request failure may indicate that no response is received associated with the "Service Request".
  • the determination may be performed by the UE.
  • the process may include switching from the 5G cell to the 4G cell locally in response to determining the service request failure upon expiry of the timer B. In an embodiment, the switching may be performed by the UE.
  • the process may include determining the service request failure within a modified timer B upon determining that the timer B is greater than the threshold amount of time.
  • the modified timer B may be less than the threshold amount of time configured by the UE.
  • the determination may be performed by the UE.
  • the process may include switching from the 5G cell to the 4G cell locally in response to determining the service request failure upon expiry of the modified timer B. In an embodiment, the switching may be performed by the UE.
  • the service request failure may be based on one of low layer failures, Random Access Channel (RACH) failures in the 5G NR, RACH failures in a service request transmission to the network, and receiving one of a "no service accept” message, and a "service reject” message from the network receiving a "service reject” message from the network, and not receiving a response from the network.
  • RACH Random Access Channel
  • the process may include proceeding the VoNR call over the 5G cell.
  • the process may include performing, by the UE, a 4G registration and an Internet Protocol Multimedia Subsystem (IMS) registration of the UE.
  • IMS Internet Protocol Multimedia Subsystem
  • the 4G registration and the IMS registration of the UE may be performed by the UE to attach the UE to the 4G cell.
  • the process may include establishing the VoLTE call over the 4G cell.
  • the VoLTE call may be established by the UE.
  • Fig. 3 illustrates an operational flow diagram 300 depicting a process for initiating a call through a SIP procedure when the UE is in a NR-RRC connected mode, in accordance with an embodiment of the present subject matter.
  • the call may be one of a VoLTE call over a 4G cell and a VoNR call over a 5G cell.
  • the process may performed by the UE.
  • the UE may be operating in 5G NR in 5G-SA mode.
  • the SIP procedure may triggered when the VoNR call is initiated.
  • the process may include initiating the VoNR call by the UE over the 5G cell.
  • the process may include, determining that the UE is in the NR RRC connected mode.
  • the UE may be moved from the NR RRC idle mode to the NR RRC connected mode as described in Fig. 2.
  • the process may include, transmitting a "Session Initiation Protocol (SIP) INVITE" message to an IMS server at a network.
  • SIP Session Initiation Protocol
  • the SIP INVITE message may be transmitted by an IMS client associated with the UE.
  • the SIP INVITE message may be transmitted upon determining that the UE is in the NR RRC connected mode.
  • the process may include, initiating a timer B by the UE.
  • the timer B may be initiated for waiting for a response associated with the "SIP INVITE" message transmitted by the UE in response to determining that the UE is in the NR RRC connected mode.
  • the timer B may be configured by a network.
  • the process may include determining, whether the timer B is greater than a threshold amount of time or not.
  • the threshold amount of time may be configured by the UE. In an exemplary embodiment, the threshold amount of time may be equal to 5 seconds. In an embodiment, where it is determined that the timer B is greater than the threshold amount of time, the process may proceed towards step 314. In an embodiment, where it is determined that the timer B is less than the threshold amount of time, the process may proceed towards step 312. In an embodiment, the determination may be performed by the UE.
  • the process may include determining one of receiving no response associated with the "SIP INVITE" message within the timer B, and receiving a temporary SIP failure within the timer B. In an embodiment, the determination may be performed by the UE. Moving ahead, the process may include switching from the 5G cell to the 4G cell locally in response to determining one of receiving no response associated with the "SIP INVITE" message within the timer B, and receiving the temporary SIP failure within the timer B. In an embodiment, the switching may be performed by the UE.
  • the process may include determining one of receiving no response associated with the "SIP INVITE" message within a modified timer B, and receiving a temporary SIP failure within the modified timer B.
  • the modified timer B may be less than the threshold amount of time configured by the UE.
  • the determination may be performed by the UE.
  • the process may include switching from the 5G cell to the 4G cell locally in response to determining one of receiving no response associated with the "SIP INVITE" message within the modified timer B, and receiving the temporary SIP failure within the modified timer B. In an embodiment, the switching may be performed by the UE.
  • the temporary SIP failure may be one of a SIP timeout and an error or timeout related to no Dedicated Bearer Establishment (DBE)/Dedicated Bearer Lost (DBL) event while initiating the VoNR call.
  • the process may include proceeding the VoNR call over the 5G cell.
  • the process may include performing, by the UE, a 4G registration and an Internet Protocol Multimedia Subsystem (IMS) registration of the UE.
  • IMS Internet Protocol Multimedia Subsystem
  • the 4G registration and the IMS registration of the UE may be performed by the UE to attach the UE to the 4G cell.
  • the process may include establishing the VoLTE call over the 4G cell.
  • the VoLTE call may be established by the UE.
  • Fig. 4 illustrates an operational flow diagram 400 depicting a process for initiating a VoLTE call based on a B1 measurement object related to a 4G cell measurement by a UE, in accordance with an embodiment of the present subject matter.
  • the process may be performed by the UE.
  • the UE may be operating in a 5G-SA mode in 5G NR.
  • the VoLTE call may be established for the UE through a 4G cell.
  • the process may include triggering a VoNR call by the UE.
  • the VoNR call may be triggered in response to transmitting the "SIP INVITE" message for the VoNR call to a network.
  • the "SIP INVITE" may be transmitted for a SIP signaling related to the 5G.
  • the VoNR call may be established upon triggering through a 5G cell.
  • the process may include, initiating a timer B by the UE.
  • the timer B may be configured by A network.
  • the process may include determining, whether the timer B is greater than a threshold amount of time or not.
  • the threshold amount of time may be configured by the UE. In an exemplary embodiment, the threshold amount of time may be equal to 5 seconds.
  • a modified timer B is initiated. In an embodiment, the modified timer B may be less than the timer B. In an embodiment, where it is determined that the timer B is less than the threshold amount of time, the process may proceed with the timer B. In an embodiment, the determination may be performed by the UE.
  • the process may include determining whether a B1 measurement object is configured or not by the network. In an embodiment, the determining may be performed in response to transmitting the "SIP INVITE" message to the network by the UE. In an embodiment, the determining may be performed by the UE. Moving ahead, in an embodiment, where it is determined that the B1 measurement object is configured by the network, the process may proceed towards step 408. Furthermore, in an embodiment, where it is determined that the B1 measurement object is not configured by the network, the process may proceed towards step 414.
  • the process may include transmitting a measurement report to the network upon determining that the B1 measurement object is configured by the network.
  • the measurement report may be associated with the 4G cell.
  • the process may include determining whether a command associated with one of a re-direction and a handover is not received from the network prior to expiry of one of the timer B and the modified timer B initiated at the step 404 in response to transmitting the measurement report.
  • the determining may be performed by the UE.
  • the re-direction and the handover may be performed from the 5G cell to the 4G cell.
  • the process may proceed towards step 412. In an embodiment, where it is determined that the command associated with one of the re-direction and the handover is not received from the network at the UE prior to the expiry of the initiated one of the timer B and the modified B time T3430 timer, the process proceed towards step 414.
  • the process include proceeding with the VoLTE call through the 4G cell.
  • the process may include determining whether the initiated one of the timer B and the modified timer B is expired or not. In an embodiment, where it is determined that the initiated one of the timer B and the modified timer B is not expired, the process may backtrack to the step 406. In an embodiment, where it is determined that the initiated one of the timer B and the modified timer B is expired, the process may proceed towards step 416.
  • the process may include switching from the 5G cell to the 4G cell locally in response to expiry of the initiated one of the timer B and the modified timer B prior to receiving one or more of the B1 measurement object and the command associated with the one or more of the handover and the re-direction.
  • the switching may be performed by the UE.
  • the process may include performing a 4G cell registration and an IMS registration of the UE.
  • the 4G cell registration and the IMS registration may be performed to attach the UE to the 4G cell.
  • the 4G cell registration and the IMS registration may be performed by the UE.
  • the process may include establishing the VoLTE call over the 4G cell by the UE.
  • Fig. 5 illustrates an operational flow diagram 500 depicting a process for establishing a voice call upon receiving an error from a network at a UE, in accordance with an embodiment of the present subject matter.
  • the process may be performed by the UE.
  • the voice call may be established at a CS Radio Access Technology (RAT).
  • the error may be one of an IMS error " ⁇ 503 Service Unavailable", and a number of SIP Server Failure Responses.
  • the number of SIP server failure responses may correspond to SIP permanent failures.
  • SIP permanent failures may include errors 300, 301, 302, 305, 380, 400, 401, 403, 404, 405, 406, 407, 408, 410, 413, 414, 415, 416, 420, 421, 422, 423, 480, 481, 482, 483, 484, 485, 488, 491, 493, 494, 500, 501, 502, 503, 504, 505, 513, 580, 600, 604, 606.
  • SDP Session Description Protocol
  • error501 may correspond to "Not Implemented
  • the error 502 may correspond to "Bad Gateway”
  • the error 503 may correspond to "Service Unavailable".
  • the process may include, transmitting an "SIP INVITE" message to an IMS server at the network.
  • the "SIP INVITE" message may be transmitted by the UE upon initiation of a VoNR call by the UE.
  • the process may include initiating a timer B upon transmitting the "SIP INVITE" message.
  • the timer B may be initiated by a network.
  • the process may include determining, whether the timer B is greater than a threshold amount of time or not.
  • the threshold amount of time may be configured by the UE. In an exemplary embodiment, the threshold amount of time may be equal to 5 seconds.
  • a modified timer B is initiated. In an embodiment, the modified timer B may be less than the timer B. In an embodiment, where it is determined that the timer B is less than the threshold amount of time, the process may proceed with the timer B. In an embodiment, the determination may be performed by the UE.
  • the process may include receiving one of the IMS error " ⁇ 503 Service Unavailable", and the number of SIP Server Failure Responses "501/502/503" in response to transmitting the "SIP INVITE" message to the network.
  • the process may include determining by the UE whether a CS call is triggered or not by the IMS client. In an embodiment, where it is determined that the CS call is triggered, the process may proceed towards step 510. In an embodiment, where it is determined that the CS call is not triggered, the process may proceed towards step 512.
  • the process may include attempting the CS call.
  • the process may include determining whether the initiated one of the timer B and the modified timer B at step 504 is expired or not. In an embodiment, where it is determined that the initiated one of the timer B and the modified timer B is not expired, the process backtrack towards the step 508. In an embodiment, where it is determined that the initiated one of the timer B and the modified timer B is expired, the process may proceed towards step 514.
  • the process may include switching from the 5G cell to the CS RAT mode in response to determining that the CS call is not triggered by the IMS client prior to expiry of the initiated one of the timer B and the modified timer B.
  • the switching may be performed by the UE.
  • the process may include establishing, by the UE, the voice call over the CS RAT.
  • the CS RAT may include one of 2G, 3G, and Code Division Multiple Access (CDMA) mode.
  • Fig. 6 illustrates an operational flow diagram 600 depicting a process for initiating a voice call by a UE over a CS RAT upon initiation of a fallback, in accordance with an embodiment of the present subject matter.
  • the process may be performed by the UE.
  • UE may be operating in a 5G-SA mode in a 5G.
  • the fallback may be triggered on initiation of a VoNR call by the UE in the 5G-SA mode.
  • the process may include maintaining a database by the UE.
  • the database may include a previous call drop history over a 4G cell and a number of network parameters.
  • the number of parameters may include a Reference Signal Received Power (RSRP), a Reference Signal Received Quality (RSRQ), a signal-to-interference-plus-noise ratio (SINR) Downlink (DL) conditions, DL grants, Uplink (UL) conditions, and UL grants.
  • RSRP Reference Signal Received Power
  • RSRQ Reference Signal Received Quality
  • SINR signal-to-interference-plus-noise ratio
  • the process may include determining that a 4G cell connected with the UE to establish the VoLTE call is prone to a call drop.
  • the determining may be performed by the UE.
  • the determining may be based on one or more of a previous history of call drops based on the number of network parameters and an existing history associated with the 4G cell for probability of the call drop.
  • the process may include switching from the 4G cell to the CS RAT by the UE upon determining that the 4G cell is prone to the call drop.
  • Fig. 7 is a diagram illustrating the configuration of a terminal 700 in a wireless communication system according to an embodiment of the present subject matter.
  • the configuration of Fig. 6 may be understood as a part of the configuration of the terminal 700.
  • terms including “unit” or “er” at the end may refer to the unit for processing at least one function or operation and may be implemented in hardware, software, or a combination of hardware and software.
  • the terminal 700 may include a controller 702 (e.g., at least one processor), a storage unit 704 (e.g., storage), data 706 and, module(s) 708, and a communication unit 710 (e.g., communicator or communication interface).
  • the terminal 700 may be a User Equipment, such as a cellular phone or other device that communicates over a plurality of cellular networks (such as a 4G, a 5G or pre-5G network or any future wireless communication network).
  • the controller 702, the storage unit 704, the data 706, and the module(s) 708, and the communication unit 710 may be communicably coupled with one another.
  • the terminal 700 may be understood as one or more of a hardware, a software, a logic-based program, a configurable hardware, and the like.
  • the controller 702 may be a single processing unit or a number of units, all of which could include multiple computing units.
  • the processor may be implemented as one or more microprocessors, microcomputers, microcontrollers, digital signal processors, central processing units, processor cores, multi-core processors, multiprocessors, state machines, logic circuitries, application-specific integrated circuits, field-programmable gate arrays and/or any devices that manipulate signals based on operational instructions.
  • the controller 702 may be configured to fetch and/or execute computer-readable instructions and/or data 706 stored in the storage unit 704.
  • the storage unit 704 may include any non-transitory computer-readable medium known in the art including, for example, volatile memory, such as static random access memory (SRAM) and/or dynamic random access memory (DRAM), and/or non-volatile memory, such as read-only memory (ROM), erasable programmable ROM (EPROM), flash memory, hard disks, optical disks, and/or magnetic tapes.
  • volatile memory such as static random access memory (SRAM) and/or dynamic random access memory (DRAM)
  • non-volatile memory such as read-only memory (ROM), erasable programmable ROM (EPROM), flash memory, hard disks, optical disks, and/or magnetic tapes.
  • the storage unit 704 may store data, such as a basic program, an application program, configuration information, and the like for operating the terminal 700.
  • the storage unit 704 may be configured as a volatile memory, a non-volatile memory, or a combination of a volatile memory and a non-volatile memory.
  • the data 706 serves, amongst other things, as a repository for storing data processed, received, and generated by one or more of, the controller 702, the storage unit 704, the module(s) 708, and the communication unit 710.
  • the module(s) 708 may also be implemented as, signal processor(s), state machine(s), logic circuitries, and/or any other device or component that manipulate signals based on operational instructions.
  • the module(s) 708 may be implemented in hardware, instructions executed by at least one processing unit, for e.g., controller 702, or by a combination thereof.
  • the processing unit may be a general-purpose processor which executes instructions to cause the general-purpose processor to perform operations or, the processing unit may be dedicated to performing the required functions.
  • the module(s) 708 may be machine-readable instructions (software) which, when executed by a processor/processing unit, may perform any of the described functionalities.
  • the module(s) 708 may be machine-readable instructions (software) which, when executed by a processor/processing unit, perform any of the described functionalities.
  • the controller 702 may control overall operations of the terminal 700. For example, the controller 702 may transmit and receive a signal via the communication unit 710. Further, the controller 702 records data in the storage unit 704 and reads the recorded data. The controller 702 may perform the functions of a protocol stack required by a particular communication standard. To this end, the controller 702 may include at least one processor or micro-processor or may be a part of the processor. Also, a part of the communication unit 710 and the controller 702 may be referred to as a communication processor (CP).
  • CP communication processor
  • the controller 702 may be configured to initiate a Voice over New Radio (VoNR) call on a 5G cell. Furthermore, the controller 702 may be configured to detect an inability of the UE to support the VoNR call on the 5G cell. Moving forward, the controller 702 may be configured to initiate a procedure to fall back to a 4G cell for the VoNR call initiated on the 5G cell.
  • the communication unit 710 may be configured to transmit a first synchronization request to the 4G LTE.
  • the controller 702 may be configured to initiate a first modified T3430 Timer in response to transmitting the first synchronization request.
  • the controller 702 may further be configured to detect a failure to synchronize with the 4G cell in response to transmitting the first synchronization request.
  • the communication unit 710 may be configured to transmit a second synchronization request to the 4G cell.
  • the controller 702 may be configured to initiate a second modified T3430 Timer in response to transmitting the second synchronization request.
  • the controller 702 may be configured to initiate a Circuit Switched (CS) call to continue the VoNR call initiated on the 5G cell upon detecting a failure to synchronize with the 4G in response to transmitting the second synchronization request.
  • CS Circuit Switched
  • the controller 702 may be configured to trigger an SIP procedure for the UE.
  • the SIP procedure may be triggered in response to initiating the VoNR call.
  • the controller 702 may be configured to determine that the UE is in a NR Radio Resource Control (RRC) idle mode.
  • the communication unit 710 may be configured to transmit , a "Service Request" message to the5G cell to move the UE to an NR RRC connected mode to establish the VoNR call.
  • controller 702 may be configured to initiate a timer B.
  • the controller 702 may be configured to switch from the 5G cell to the 4G cell locally in response to determining a service request failure within expiry of the timer B.
  • the controller 702 may be configured to establish a VoLTE call over the 4G cell.
  • the controller 702 may be configured determine that the timer B is greater than a threshold amount of time configured by a network. Moving ahead, the controller 702 may be configured to initiate a modified timer B such that the modified timer B is less than the threshold amount of time. Further, the controller 702 may be configured to switch from the 5G cell to the 4G cell, locally in response to determining the service request failure within expiry of the modified timer B.
  • the service request failure may be based on one of low layer failures, Random Access Channel (RACH) failures in the 5G NR, RACH failures in a service request transmission to the network, and receiving a "no service accept” message from the network, receiving a "service reject” message from the network, and not receiving a response from the network.
  • RACH Random Access Channel
  • the communication unit 710 may be configured to transmit a "Session Initiation Protocol (SIP) INVITE" message to an IMS server when the UE is in the NR RRC connected mode.
  • the controller 702 may be configured to initiate a timer B. Moving forward, the controller 702 may be configured to switch the UE from the 5G cell to the 4G cell in response to expiry of the timer B prior to receiving one of a response for the "SIP INVITE" message from the network and a temporary SIP invite error.
  • the controller 702 may be configured to establish , a VoLTE call over the 4G cell.
  • the controller 702 may be configured determine that the timer B is greater than a threshold amount of time configured by a network. Moving ahead, the controller 702 may be configured to initiate a modified timer B such that the modified timer B is less than the threshold amount of time. Further, the controller 702 may be configured to switch from the 5G cell to the 4G cell in response to expiry of the modified timer B prior to receiving one of the response for the "SIP INVITE" message from the network and the temporary SIP invite error.
  • the controller 702 may be configured to determine a B1 measurement object is not configured by the network in response to transmitting the "SIP INVITE" message from the UE to the network.
  • the "SIP INVITE" message may be transmitted by the communication unit 710.
  • the controller 702 may be configured to switch the UE from the 5G cell to the 4G cell after an expiry of the timer B in response to determining that the B1 measurement object is not configured by the network. Moving forward, the controller 702 may be configured to establish a VoLTE call over the 4G cell in the 4G LTE.
  • the communication unit 710 may be configured to transmit a measurement report to the network, in response to determining that the B1 measurement object is configured by the network.
  • the controller 702 may be configured to determine that the B1 measurement object is configured by the network.
  • the controller 702 may be configured to ascertain a command associated with one of a re-direction and a handover is not received from the network prior to expiry of the timer B in response to transmitting the measurement report.
  • the controller 702 may be configured to switch the UE from the 5G cell to the 4G cell in response to determining an expiry of the timer B prior to a receiving the command associated with one of the re-direction and the handover is not received from the network. Moving forward, the controller 702 may be configured to establish the VoLTE call over the 4G cell in the 4G LTE.
  • the controller 702 may be configured determine that the timer B is greater than a threshold amount of time configured by a network. Moving ahead, the controller 702 may be configured to initiate a modified timer B such that the modified timer B is less than the threshold amount of time. Further, the controller 702 may be configured to switch from the 5G cell to the 4G cell in response to determining that the B1 measurement object is not configured by the network prior to expiry of the modified timer B.
  • the controller 702 may be configured to switch the UE from the 5G cell to the 4G cell in response to determining an expiry of the modified timer B prior to a receiving the command associated with one of the re-direction and the handover is not received from the network. Moving forward, the controller 702 may be configured to establish the VoLTE call over the 4G cell in the 4G LTE.
  • the communication unit 702 may be configured to receive an error prior to expiry of a timer B in response to transmitting the "SIP INVITE" message to the IMS server.
  • the controller 702 may be configured to ascertain a CS call is not triggered by the IMS client prior to expiry of the timer B. Moving forward, the controller 702 may be configured to switch the UE from the 5G cell to a CS RAT mode in response to ascertaining the CS call is not triggered by the IMS client prior to expiry of the timer B. Furthermore, the controller 702 may be configured to establish a voice call over the CS RAT.
  • the controller 702 may be configured determine that the timer B is greater than a threshold amount of time configured by a network. Moving ahead, the controller 702 may be configured to initiate a modified timer B such that the modified timer B is less than the threshold amount of time. Further, the controller 702 may be configured to switch from the 5G cell to the 4G cell in response to ascertaining the CS call is not triggered by the IMS client prior to expiry of the modified timer B.
  • the controller 702 may be configured to maintain a database comprising a previous call drop history over the 4G LTE and the plurality of network parameters. Furthermore, the controller 702 may be configured to ascertain that a 4G cell connected with the UE to establish the VoLTE call is prone to a call drop based on one or more of a previous history of call drops based on the plurality of network parameters and an existing history associated with the 4G cell for probability of the call drop. Furthermore, the controller 702 may be configured to switch from the 4G cell to the CS RAT in response to ascertaining that the 4G cell is prone to the call drop.
  • a method for reducing call setup time in a 5G UE comprises initiating a Voice over New Radio (VoNR) call on a 5G cell, detecting an inability of the UE to support the VoNR call on the 5G cell, initiating a procedure to fall back to a 4G cell for the VoNR call initiated on the 5G cell, transmitting a first synchronization request to the 4G cell, transmitting a second synchronization request to the 4G cell in response to detecting a failure to synchronize with the 4G cell upon transmitting the first synchronization request and initiating a Circuit Switched (CS) call to continue the VoNR call upon detecting a failure to synchronize with the 4G cell in response to transmitting the second synchronization request.
  • VoIP Voice over New Radio
  • the 5G cell is connected to a 5G core and the 4G cell is connected to a 4G core.
  • the method may further comprising initiating a first modified T3430 timer in response to transmitting the first synchronization request and a second modified T3430 timer in response to transmitting the second synchronization request, wherein the first modified T3430 timer and the second modified T3430 timer is based on a plurality of network parameters.
  • the failure to synchronize with the 4G cell in response to transmitting the first synchronization request and the second synchronization request is detected based on one or more of: receipt of no response from the 4G cell within the first modified T3430 timer and the second modified T3430 timer and receipt of a reject message in response to the first synchronization request within the first modified T3430 timer and the second synchronization request within the second modified T3430 timer.
  • the plurality of network parameters comprises a Reference Signal Received Power (RSRP), a Reference Signal Received Quality (RSRQ), a signal-to-interference-plus-noise ratio (SINR) Downlink (DL) conditions, DL grants, Uplink (UL) conditions, and UL grants.
  • RSRP Reference Signal Received Power
  • RSRQ Reference Signal Received Quality
  • SINR signal-to-interference-plus-noise ratio
  • the second modified T3430 timer is less than or equal to the first modified T3430 timer.
  • initiating the VoNR call on the 5G cell comprises: triggering, by the UE, an SIP procedure in response to initiating the VoNR call, determining, by the UE, that the UE is in a NR Radio Resource Control (RRC) idle mode, transmitting, by the UE, a "Service Request" message to the 5G cell to move the UE to an NR RRC connected mode to establish the VoNR call and initiating a timer B, switching, by the UE, from the 5G cell to the 4G cell in response to determining a service request failure within expiry of the timer B and establishing, by the UE, a VoLTE call over the 4G cell.
  • RRC Radio Resource Control
  • the service request failure is based on one of low layer failures, Random Access Channel (RACH) failures in the 5G NR, RACH failures in a service request transmission to the network, and receiving a "no service accept” message from the network, receiving a "service reject” message from the network, and not receiving a response from the network.
  • RACH Random Access Channel
  • the method may further comprises transmitting, by the UE, a "Session Initiation Protocol (SIP) INVITE" message to an IMS server when the UE is in the NR RRC connected mode and initiating the timer B, switching, by the UE, from the 5G cell to the 4G cell in response to expiry of the timer B prior to receiving one of a response for the "SIP INVITE" message from the network and a temporary SIP invite failure, and establishing, by the UE, a VoLTE call over the 4G cell.
  • SIP Session Initiation Protocol
  • the method may further comprises determining, by UE, a B1 measurement object is not configured by the network in response to transmitting the "SIP INVITE" message from the UE to the network, switching, by the UE, from the 5G cell to the 4G cell after an expiry of the timer B in response to determining that the B1 measurement object is not configured by the network, and establishing, by the UE, a VoLTE call over the 4G cell.
  • the method may further comprises transmitting, by the UE, a measurement report to the network, in response to determining that the B1 measurement object is configured by the network, ascertaining, by the UE, a command associated with one of a re-direction and a handover is not received from the network prior to expiry of the timer B in response to transmitting the measurement report, switching, by the UE, from the 5G cell to the 4G cell in response to determining an expiry of the timer B prior to a receiving the command associated with one of the re-direction and the handover is not received from the network, and establishing, by the UE, a VoLTE call over the 4G cell.
  • the method may further comprises receiving, by the UE, an error prior to expiry of the timer B in response to transmitting the "SIP INVITE" message to the IMS server, ascertaining, by the UE, a CS call is not triggered by the IMS client prior to expiry of the timer B, switching, by the UE, from the 5G cell to a CS RAT mode in response to ascertaining the CS call is not triggered by the IMS client prior to expiry of the timer B and establishing, by the UE, a voice call over the CS RAT.
  • initiating the timer B comprises determining, by the UE, that the timer B is greater than a threshold amount of time, wherein the threshold amount of time is configured by the UE, initiating, by the UE, a modified timer B, wherein the modified timer B is less than the threshold amount of time, switching, by the UE, from the 5G cell to the 4G cell prior to expiry of the modified timer B, and establishing, by the UE, a voice call over the 4G cell.
  • the method may further comprises switching, by the UE, from the 5G cell to a CS RAT mode prior to expiry of the modified timer B, and establishing, by the UE, a voice call over the CS RAT.
  • the fallback is triggered on initiation of the VoNR call by the UE
  • the method comprises maintaining, by the UE, a database comprising a previous call drop history over the 4G cell and the plurality of network parameters, ascertaining, by the UE, that the 4G cell connected with the UE to establish the VoLTE call is prone to a call drop based on one or more of a previous history of call drops based on the plurality of network parameters and an existing history associated with the 4G cell for probability of the call drop, and switching, by the UE, from the 4G cell to the CS RAT in response to ascertaining that the 4G cell is prone to the call drop.

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Abstract

La présente divulgation porte sur un procédé et un système de communication permettant de faire converger un système de communication de 5e génération (5G) destiné à prendre en charge des débits de données supérieurs à ceux d'un système de 4e génération (4G) avec une technologie de l'Internet des Objets (IdO). La présente divulgation peut être appliquée à des services intelligents basés sur la technologie de communication 5G et sur la technologie liée à l'IdO, tels que la maison intelligente, le bâtiment intelligent, la ville intelligente, la voiture intelligente, la voiture connectée, les soins de santé, l'enseignement numérique, le commerce de détail intelligent, les services liés à la sûreté et à la sécurité. Selon un mode de réalisation, la divulgation concerne un procédé de réduction du temps d'établissement d'appel dans un UE du type 5G. Le procédé consiste à initier un appel VoNR (téléphonie sur nouvelle radio) sur une cellule 5G. Le procédé consiste à détecter une incapacité de l'UE à prendre en charge l'appel VoNR sur la cellule 5G. Le procédé consiste à initier une procédure pour revenir à une cellule 4G pour l'appel VoNR initié sur la cellule 5G.
PCT/KR2021/010956 2020-08-18 2021-08-18 Procédés et systèmes pour réduire un temps d'établissement d'appel dans un équipement utilisateur 5g Ceased WO2022039496A1 (fr)

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WO2023235095A1 (fr) * 2022-06-03 2023-12-07 Google Llc Modification de temporisateur sip pour prendre en charge une reprise d'appel ims
WO2024041422A1 (fr) * 2022-08-22 2024-02-29 维沃移动通信有限公司 Procédé et appareil de communication, et terminal et nœud de réseau central
CN115442843A (zh) * 2022-08-31 2022-12-06 维沃移动通信有限公司 新空口网络中b1测量的控制方法、装置及电子设备
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CN116233972A (zh) * 2023-02-13 2023-06-06 中国联合网络通信集团有限公司 VoNR业务下网络选择方法、系统、电子设备及介质
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WO2024246924A1 (fr) * 2023-05-31 2024-12-05 Jio Platforms Limited Système et procédé de repli d'eps
WO2025130026A1 (fr) * 2023-12-19 2025-06-26 荣耀终端股份有限公司 Procédé et dispositif de mise à jour d'emplacement, et système de puce et support de stockage

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