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KR-102962928-B1 - METHOD AND APPARATUS FOR RECOVERING FROM STEERING OF ROAMING RELATED FAILURES

KR102962928B1KR 102962928 B1KR102962928 B1KR 102962928B1KR-102962928-B1

Abstract

The present disclosure relates to a method and apparatus performed by a terminal in a wireless communication system. A method performed by a terminal in a wireless communication system may include the step of detecting a steering of roaming (SOR) failure in manual mode during or after registration with a first VPLMN (visitor-public land mobile network); the step of switching the manual mode to an automatic mode based on the determination that the SOR failure has occurred; and the step of performing a PLMN selection procedure to obtain service from a second VPLMN having a higher priority than the first VPLMN.

Inventors

  • 라마크리슈나 비자야 쿠마르 아니케탄
  • 티와리 쿤단
  • 쿠마르 랄리

Assignees

  • 삼성전자주식회사

Dates

Publication Date
20260508
Application Date
20200811
Priority Date
20190813

Claims (14)

  1. In a method performed by a terminal in a wireless communication system, A step of detecting a steering of roaming (SOR) failure in manual mode during or after registration with the first VPLMN (visitor-public land mobile network); A step of switching the above manual mode to an automatic mode; A step of waiting until the terminal moves to an idle state or an RRC (radio resource control) inactive state when the SOR failure is detected in the manual mode and the manual mode is switched to the automatic mode; and A method comprising the step of performing a PLMN selection procedure to obtain service from a second VPLMN having a higher priority than the first VPLMN in the above automatic mode.
  2. In Article 1, A method in which, if the first VPLMN is determined to be the PLMN where the SOR failure occurred, the first VPLMN is considered with the lowest priority while performing the PLMN selection procedure.
  3. In Article 1, A method in which the above terminal is registered in the above first VPLMN where an SOR failure occurs when switching the above manual mode to the above automatic mode.
  4. In Article 1, A method in which, when the above terminal has an established emergency PDU (protocol data unit) session, the PLMN selection procedure is performed after the emergency PDU session is released.
  5. In Article 1, The method further includes the step of receiving a registration acceptance message containing SOR information from the first VPLMN while registering with the first VPLMN; A method in which the above SOR failure is detected based on the above registration acceptance message.
  6. In Article 5, A method further comprising the step of determining that the SOR failure occurs when the SOR information is missing from the registration acceptance message or when the security check of the SOR information fails during registration with the first VPLMN.
  7. delete
  8. In a terminal operating in a wireless communication system, transceiver; and It includes at least one processor connected to the above transceiver; and The above at least one processor is, Detecting a steering of roaming (SOR) failure in manual mode during or after registration with the first VPLMN (visitor-public land mobile network), and Switching the above manual mode to automatic mode, When the SOR failure is detected in the manual mode and the manual mode is switched to the automatic mode, wait until the terminal moves to an idle state or an RRC (radio resource control) inactive state, and A terminal that performs a PLMN selection procedure to obtain a service from a second VPLMN having a higher priority than the first VPLMN in the above automatic mode.
  9. In Article 8, A terminal in which, if the first VPLMN is determined to be the PLMN where the SOR failure occurred, the first VPLMN is considered with the lowest priority during the PLMN selection procedure.
  10. In Article 8, The above terminal is a terminal registered in the first VPLMN where an SOR failure occurs when switching the above manual mode to the above automatic mode.
  11. In Article 8, A terminal in which, if the above terminal has an established emergency PDU (protocol data unit) session, the PLMN selection procedure is performed after the emergency PDU session is released.
  12. In Article 8, A terminal, wherein at least one processor receives a registration acceptance message containing SOR information from the first VPLMN while registering with the first VPLMN, and the SOR failure is detected based on the registration acceptance message.
  13. In Article 12, A terminal in which at least one processor determines that the SOR failure occurs when the SOR information is missing from the registration acceptance message or when the security check of the SOR information fails during registration with the first VPLMN.
  14. delete

Description

Method and apparatus for recovering from stearing of roaming related failures The embodiments of the present disclosure relate to fifth-generation (5G) wireless communication networks, and more specifically to methods and systems that enable recovery from Steering of Roaming (SOR) related failures in 5G wireless communication networks. Efforts are being made to develop improved 5G (5th generation) communication systems or pre-5G communication systems to meet the increasing demand for wireless data traffic following the commercialization of 4G (4th generation) communication systems. For this reason, 5G communication systems or pre-5G communication systems are referred to as Beyond 4G Network communication systems or Post-LTE (Long Term Evolution) systems. To achieve high data transmission rates, the implementation of 5G communication systems in the mmWave band (e.g., the 60 GHz band) is being considered. In order to mitigate path loss and increase the transmission distance of radio waves in the ultra-high frequency band, beamforming, massive array multiple input/output (massive MIMO), full-dimensional multiple input/output (Full Dimensional MIMO, FD-MIMO), array antenna, analog beam-forming, and large-scale antenna technologies are being discussed in 5G communication systems. In addition, to improve the system's network, technologies such as advanced small cells, advanced small cells, cloud radio access networks (cloud RAN), ultra-dense networks, device-to-device communication (D2D), wireless backhaul, moving networks, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation are being developed in 5G communication systems. In addition, advanced coding modulation (ACM) methods such as FQAM (Hybrid Frequency Shift Keying and Quadrature Amplitude Modulation) and SWSC (Sliding Window Superposition Coding), as well as advanced access technologies such as FBMC (Filter Bank Multi Carrier), NOMA (Non Orthogonal Multiple Access), and SCMA (Sparse Code Multiple Access) are being developed in 5G systems. Meanwhile, the Internet is evolving from a human-centric network where humans generate and consume information into an IoT (Internet of Things) network that processes information by exchanging it among distributed components, such as objects. IoE (Internet of Everything) technology, which combines IoT with Big Data processing technologies via connections with cloud servers, is also emerging. To implement IoT, technological elements such as sensing technology, wired and wireless communication and network infrastructure, service interface technology, and security technology are required; consequently, technologies such as sensor networks, Machine-to-Machine (M2M) communication, and Machine-Type Communication (MTC) are currently being researched to facilitate the connection of objects. In an IoT environment, intelligent IT services that create new value for human life by collecting and analyzing data generated from connected objects can be provided. Through the convergence and integration of existing IT technologies with various industries, IoT can be applied to fields such as smart homes, smart buildings, smart cities, smart or connected cars, smart grids, healthcare, smart home appliances, and advanced medical services. Accordingly, various attempts are being made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, Machine to Machine (M2M), and Machine Type Communication (MTC) are being implemented using 5G communication techniques such as beamforming, MIMO, and array antennas. The application of cloud wireless access networks (cloud RAN) as the big data processing technology described earlier can also be considered an example of the convergence of 5G and IoT technologies. As various services can be provided due to the advancement of mobile communication systems as described above, there is a need for a method to effectively provide a method for transmitting and receiving reference signals in such wireless communication systems. As mentioned above, as various services can be provided with the advancement of wireless communication systems, a method is needed to easily provide these services. Embodiments of the present disclosure are illustrated in the accompanying drawings, but similar reference numerals throughout the drawings indicate corresponding parts in the various drawings. Embodiments of the present disclosure will be better understood from the following description with reference to the drawings. Figure 1 is a flowchart illustrating a problem in which a user device (UE) ignores roaming steering (SOR) related failures while operating in manual mode, and therefore does not take any recovery action when the UE switches to automatic mode of operation. FIG. 2a is a diagram illustrating an exemplary scenario in which a UE configured to recover from SOR-related failures by receiving SOR information from either the first VPLMN or the seco