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EP-4740634-A1 - STATE TRANSITION DURING DISASTER ROAMING WAITING PERIOD

EP4740634A1EP 4740634 A1EP4740634 A1EP 4740634A1EP-4740634-A1

Abstract

In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. The UE selects a network for disaster roaming. The UE starts a timer with a randomly generated value within a disaster roaming wait range. When the UE is in a deregistered state, the UE enters a 5GMM-DEREGISTERED. ATTEMPTING-REGISTRATION state while the timer is running. When the UE is in a registered state, the UE enters a 5GMM-REGISTERED. ATTEMPTING-REGISTRATION-UPDATE state while the timer is running. The UE refrains from initiating any 5GMM procedure except emergency services while the timer is running.

Inventors

  • PUNEET, Puneet
  • NIEMI, Marko

Assignees

  • MediaTek Singapore Pte. Ltd.

Dates

Publication Date
20260513
Application Date
20240516

Claims (20)

  1. A method of wireless communication of a user equipment (UE) , comprising: selecting a network for disaster roaming; starting a timer with a randomly generated value within a disaster roaming wait range; entering a first 5th Generation Mobility Management (5GMM) state while the timer is running, wherein the first 5GMM state is either an 5GMM-DEREGISTERED. ATTEMPTING-REGISTRATION state, when the UE is in a deregistered state; or an 5GMM-REGISTERED. ATTEMPTING-REGISTRATION-UPDATE state, when the UE is in a registered state; and refraining from initiating any 5GMM procedure except emergency services while the timer is running.
  2. The method of claim 1, further comprising: performing a registration procedure for disaster roaming services upon expiration of the timer.
  3. The method of claim 1, wherein the disaster roaming wait range is provisioned to the UE by a network.
  4. The method of claim 1, further comprising: storing the disaster roaming wait range in a non-volatile memory of the UE.
  5. The method of claim 1, further comprising: detecting a disaster condition affecting a registered PLMN of the UE, wherein the network for disaster roaming is a public land mobile network (PLMN) , wherein the PLMN is selected in response to detecting the disaster condition.
  6. The method of claim 5, wherein detecting the disaster condition comprises receiving a system information block (SIB) indicating the disaster condition.
  7. The method of claim 1, further comprising: receiving a list of PLMNs to be used in disaster conditions from a network, wherein the selected PLMN for disaster roaming is chosen based on the received list.
  8. The method of claim 7, wherein the selected PLMN for disaster roaming is a forbidden PLMN of the UE under a normal condition.
  9. A method of wireless communication of a user equipment (UE) , comprising: determining that a disaster condition has ended; selecting a network for returning from disaster roaming; starting a timer with a randomly generated value within a disaster return wait range; entering a first 5th Generation Mobility Management (5GMM) state while the timer is running, wherein the first 5GMM state is either an 5GMM-DEREGISTERED. ATTEMPTING-REGISTRATION state when the UE is in deregistered state; or an 5GMM-REGISTERED. ATTEMPTING-REGISTRATION-UPDATE state when the UE is in registered state; and refraining from initiating any 5GMM procedure except emergency services while the timer is running.
  10. The method of claim 9, wherein the network for returning from disaster roaming is a public landline mobile network (PLMN) , the method further comprising: performing a registration procedure on the selected PLMN upon expiration of the timer.
  11. The method of claim 9, wherein the disaster return wait range is provisioned to the UE by a network.
  12. The method of claim 9, further comprising: storing the disaster return wait range in a non-volatile memory of the UE.
  13. The method of claim 9, wherein determining that the disaster condition has ended comprises receiving a system information block (SIB) indicating an end of the disaster condition.
  14. The method of claim 9, wherein the selected PLMN is a registered PLMN of the UE before the disaster condition.
  15. An apparatus for wireless communication, the apparatus being a user equipment (UE) , comprising: a memory; and at least one processor coupled to the memory and configured to: select a network for disaster roaming; start a timer with a randomly generated value within a disaster roaming wait range; enter a first 5th Generation Mobility Management (5GMM) state while the timer is running, wherein the first 5GMM state is either an 5GMM-DEREGISTERED. ATTEMPTING-REGISTRATION state, when the UE is in a deregistered state; or an 5GMM-REGISTERED. ATTEMPTING-REGISTRATION-UPDATE state, when the UE is in a registered state; and refrain from initiating any 5GMM procedure except emergency services while the timer is running.
  16. The apparatus of claim 15, wherein the at least one processor is further configured to: perform a registration procedure for disaster roaming services upon expiration of the timer.
  17. The apparatus of claim 15, wherein the disaster roaming wait range is provisioned to the UE by a network.
  18. The apparatus of claim 15, wherein the at least one processor is further configured to: store the disaster roaming wait range in a non-volatile memory of the UE.
  19. The apparatus of claim 15, wherein the at least one processor is further configured to: detect a disaster condition affecting a registered PLMN of the UE, wherein the network for disaster roaming is a public land mobile network (PLMN) , wherein the PLMN is selected in response to detecting the disaster condition.
  20. The apparatus of claim 19, wherein to detect the disaster condition, the at least one processor is further configured to: receive a system information block (SIB) indicating the disaster condition.

Description

STATE TRANSITION DURING DISASTER ROAMING WAITING PERIOD CROSS-REFERENCE TO RELATED APPLICATION (S) This application claims priority of Indian Patent Application Serial No. 202321045847, entitled “A METHOD TO DEFINE STATE TRANSITION DURING DISASTER ROAMING WAITING PERIOD” and filed on July 7, 2023, which is expressly incorporated by reference herein in its entirety. TECHNICAL FIELD The present disclosure relates generally to communication systems, and more particularly, to techniques of managing 5G mobility management (5GMM) state transitions for a user equipment (UE) during a waiting period for disaster roaming. BACKGROUND The statements in this section merely provide background information related to the present disclosure and may not constitute prior art. Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems may employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources. Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, and time division synchronous code division multiple access (TD-SCDMA) systems. These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate on a municipal, national, regional, and even global level. An example telecommunication standard is 5G New Radio (NR) . 5G NR is part of a continuous mobile broadband evolution promulgated by Third Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, scalability (e.g., with Internet of Things (IoT) ) , and other requirements. Some aspects of 5G NR may be based on the 4G Long Term Evolution (LTE) standard. There exists a need for further improvements in 5G NR technology. These improvements may also be applicable to other multi-access technologies and the telecommunication standards that employ these technologies. SUMMARY The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later. In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. The UE selects a network for disaster  roaming. The UE starts a timer with a randomly generated value within a disaster roaming wait range. When the UE is in a deregistered state, the UE enters a 5GMM-DEREGISTERED. ATTEMPTING-REGISTRATION state while the timer is running. When the UE is in a registered state, the UE enters a 5GMM-REGISTERED. ATTEMPTING-REGISTRATION-UPDATE state while the timer is running. The UE refrains from initiating any 5GMM procedure except emergency services while the timer is running. In another aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. The UE determines that a disaster condition has ended. The UE selects a network for returning from disaster roaming. The UE starts a timer with a randomly generated value within a disaster return wait range. The UE enters a first 5th Generation Mobility Management (5GMM) state while the timer is running. When the UE is in deregistered state, the first 5GMM state is an 5GMM-DEREGISTERED. ATTEMPTING-REGISTRATION state. When the UE is in registered state, the first 5GMM state is an 5GMM-REGISTERED. ATTEMPTING-REGISTRATION-UPDATE state. The UE refrains from initiating any 5GMM procedure except emergency services while the timer is running. To the accomplishment of the foregoing and related ends, the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed, and this description is intended to include all such aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating an example of a wireless communications system and an access network. FIG. 2 is a diagram illustrating a base station in communication