Information notification

Abstract

A method of information notification, a method of reception, a user device, and a network device are provided. The method of information notification comprises: sending an RRC resume request message to a network device; receiving a first RRC message sent by the network device in response to the RRC resume request message; and sending a second RRC message in response to the first RRC message to the network device, wherein, in the event that the user device is in idle mode, when a PLMN is reselected to an EPLMN, or when a PLMN is reselected to an EPLMN and the RNA update conditions are met, the second RRC message carries the identity of the EPLMN.

Description

Information notification Technical field This disclosure relates to the field of communications technologies and, in particular, to a method of information notification, a method of reception, user equipment, and a network device. Background An inactive terminal, such as a user equipment (UE), where the RAN notification area (RNA) update conditions are met, can initiate an RNA update process, called an RNAU process. The RNA update conditions can be a periodic RNAU timeout or the EU leaving the configured RNA area. In the RNAU process, the EU can initiate an RRC (Radio Resource Control) resumption procedure at a base station. Specifically, when initiating an RRC resumption procedure, the EU can first send an RRC Resumption Request message to the base station. This message may carry a cause value that must be set to RNAU to indicate to the base station that the related RRC process is being initiated because the EU meets the RNA update conditions. Then, after receiving the RRC resumption procedure message from the EU, the base station responds to the EU with an RRC Release message containing suspended configuration information. This message instructs the EU to remain in RRC inactive mode and updates the EU's related parameter settings, including the RNA configuration information, using the suspended configuration information. Furthermore, when a Public Land Mobile Network (PLMN) reselects an equivalent PLMN (EPLMN) in an inactive EU, it is expected to help the EU report the identity of the reselected EPLMN to the base station to enable effective EU control by network. Considering the related technologies, when the condition occurs simultaneously in an inactive EU, the PLMN reselects the EPLMN and the RNA update conditions are met, since MSG4 (RRC version with suspension configuration) responded by the base station in the RNAU process indicates that the EU should remain inactive, therefore the EU will not send a Full RRC Resumption message, which will cause the failure to report the reselected EPLMN to the base station. RAN WG2: "LS on inclusion of selected PLMN into the complete message", 3GPP DRAFT; R2-1813424, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE; 650, ROUTE DES LUCIOLES; F-06921 SOPHIA-ANTIPOLIS CEDEX; FRANCE vol. RAN WG2, no. Gothenburg, Sweden; 2018082.- 20180824 August 26, 2018 (2018-08-26) ) relates to the inclusion of a selected PLMN identity in the complete resume message WO 2018 / 131956 A1 relates to a method and apparatus for configuring a packet data convergence protocol (PDCP) and a radio link control (RLC) header format in a next-generation mobile communication system. Compendium This disclosure provides a method for notifying information, a method for receiving information, a user device, and a network device to solve the problem that when the PLMN reselects EPLMN and the RNA update conditions are simultaneously met in an inactive EU, the EPLMN reselection is not reported to a network device. The invention is set forth in the accompanying set of claims.In the realizations of this disclosure, on the one hand, an RRC resumption procedure is initiated through the user equipment, when the PLMN reselects EPLMN, or the PLMN reselects EPLMN and the RNA update conditions are met, the user equipment can report the identity of the reselected EPLMN by the RRC information, to report the identity of the reselected EPLMN to the network device even if the PLMN reselects EPLMN and the RNA update conditions are met simultaneously in the case that the user equipment is in idle mode, that is, in the case of any reselection of PLMN to EPLMN, the identity of the reselected EPLMN can be reported to ensure that the network device can obtain the identity of the reselected EPLMN in a timely manner to ensure the performance of the related communication. On the other hand, when the PLMN re-selects EPLMN, or the PLMN re-selects EPLMN and the RNA update conditions are met simultaneously in the case that the user equipment is in idle mode, it can be done that the identity of the re-selected EPLMN is reported by an RRC message directly, to reduce signaling overhead, ensuring communication performance under the condition of meeting the identity reporting requirements of the re-selected EPLMN. Brief description of the drawings To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings required herein are briefly presented below. Specifically, the drawings in the following description are merely some embodiments of this disclosure; a person with standard technical knowledge can also obtain other accompanying drawings without any further creative effort based on these drawings. FIG. 1 is a first flowchart of an information notification method according to one embodiment of the present disclosure; FIG. 2 is a second flowchart of an information notification method according to one embodiment of the present disclosure; FIG. 3 is a flowchart of an information notification method according to a specific first embodiment of the present disclosure; FIG. 4 is a flowchart of an information notification method according to a specific second embodiment of the present disclosure; FIG. 5 is a flowchart of an information notification method according to a specific third embodiment of this disclosure; FIG. 6 is a flowchart of an information notification method according to a specific fourth embodiment of the present disclosure; FIG. 7 is a flowchart of an information notification method according to a specific fifth embodiment of this disclosure; FIG. 8 is a first flowchart of an information reception method according to an embodiment of the present disclosure; FIG. 9 is a second flowchart of an information reception method according to an embodiment of the present disclosure; FIG. 10 is a first schematic diagram of a user equipment according to an embodiment of the present disclosure; FIG. 11 is a second schematic diagram of a user equipment according to an embodiment of the present disclosure; FIG. 12 is a first schematic diagram of a network device according to an embodiment of the present disclosure; FIG. 13 is a second schematic diagram of a network device according to an embodiment of the present disclosure; FIG. 14 is a third schematic diagram of a user equipment according to an embodiment of the present disclosure; and FIG. 15 is a third schematic diagram of a network device according to an embodiment of the present disclosure. Description of achievements The present invention is defined by the appended independent claims. Advantageous embodiments are described in the appended dependent claims. Embodiments and / or examples mentioned in the description that are not within the scope of the claims are helpful in understanding the present invention. To more clearly describe the technical solutions in the embodiments of the present disclosure, the accompanying drawings required in the embodiments of the present disclosure are briefly described below. Apparently, the accompanying drawings in the following descriptions merely show some embodiments of the present disclosure, and a person skilled in the art can still derive other drawings from these accompanying drawings without creative effort. As shown in FIG. 1, the claimed embodiment provides a method of information notification, applied to the user's equipment, and the method includes the following steps: Step 101: Send an RRC Resumption Request message to a network device. It is understandable that the user's computer is idle when sending an RRC Resumption Request message. Before initiating an RRC resumption procedure, the user's computer can monitor whether PLMN selects EPLMN and whether the RNA update conditions are met. The precondition for the user's computer to initiate an RRC resumption procedure can be any of the following: PLMN selects EPLMN, the RNA update conditions are met, and PLMN selects EPLMN simultaneously. Step 102: Receive an initial RRC message sent by a network device in response to an RRC Resume Request message. This can be interpreted as meaning that after receiving an RRC Resume Request message sent by the user computer, a network device can respond with a first RRC message in response to the RRC Resume Request message to the user computer. In this specific implementation of the present disclosure, based on the protocol or other pre-established conditions, the first RRC message may be an existing RRC message, such as an RRC resume message or an RRC release message, or it may be a redefined RRC message, such as New_RRC_Message_1. It should be noted that when the first RRC message is an RRC release message, to ensure that the user equipment can report a re-selected EPLMN identity, the RRC release message may carry suspend configuration information, including wireless resource configuration information, which may indicate that resources are occupied by a second RRC message, so that the user equipment sends a second RRC message for the indicating resources. Step 103: Send a second RRC message in response to a first RRC message to a network device. If the user computer is in idle mode, when the PLMN reselects EPLMN, or when the PLMN reselects EPLMN and the RNA update conditions are met simultaneously, the second RRC message carries the reselected EPLMN identity. Sending a second RRC message in response to a first RRC message to a network device can be interpreted as the user computer responding with a second RRC message to the first RRC message sent by the network device after receiving the first RRC message. In this specific realization of the present disclosure, based on the protocol or other pre-established conditions, the second RRC message may be an existing RRC message, such as a full RRC resumption message, or a redefined RRC message, such as New RRC_Message_2 or New RRC_Message_3. For example, in a specific implementation, the first RRC message may be an RRC resume message and the second RRC message may be a full RRC resume message at the same time; or the first RRC message may be an RRC release message and the second RRC message may be New RRC message _2 at the same time; or the first RRC message may be New RRC message _1 and, meanwhile, the second RRC message may be New RRC message _3. In the realizations of this present disclosure, an RRC resumption procedure is initiated through the user equipment when the PLMN reselects EPLMN, or when the PLMN reselects EPLMN and the RNA update conditions are met. The user equipment can report the identity of the reselected EPLMN using RRC information. This allows the network device to report the identity of the reselected EPLMN even if the PLMN reselects EPLMN and the RNA update conditions are met simultaneously, in the event that the user equipment is in an idle mode. That is, in the case of any reselection of PLMN to EPLMN, the identity of the reselected EPLMN can be reported to ensure that the network device can promptly obtain the identity of the reselected EPLMN to guarantee the performance of the related communication. In this specific embodiment of the present disclosure, when the user computer sends the RRC Resumption Request message when the PLMN reselects EPLMN, or the PLMN reselects EPLMN and the RNA update conditions are met at the same time, the RRC Resumption Request message may carry a first cause value, which can be used to indicate that the PLMN reselects EPLMN on the user computer, i.e., a corresponding RRC resumption procedure is initiated because the PLMN reselects EPLMN, or the PLMN reselects EPLMN and the RNA update conditions are met, i.e., a corresponding RRC resumption procedure is initiated because the PLMN reselects EPLMN and the RNA update conditions are met. It should be noted that the first cause value can be selected as a new cause value. When a network device responds to a first RRC message in response to an RRC Resume Request message to the user computer, it can determine the relevant first RRC message based on the first cause value included in the RRC Resume Request message. For example, if the first cause value indicates that PLMN is reselected to EPLMN on the user computer, the network device can determine that the first RRC message is an RRC Resume message, an RRC Release message, or an RRC New_1 message. Alternatively, if the first cause value indicates that PLMN is reselecting EPLMN and the RNA update conditions are met on the user computer, the network device can determine that the first RRC message is an RRC Resume message, an RRC Release message, or an RRC New_1 message. Additionally, the first cause value can be determined by the Non-Access Stratum (NAS) on the user equipment, and provided to the Access Stratum (AS) at the same time as the re-selected EPLMN identity is provided to it; or, the first cause value can be determined after AS on the user equipment provides a re-selected EPLMN identity on NAS to AS, i.e., after NAS provides a re-selected EPLMN identity to AS, the first cause value is set by AS. Or, when the RRC Resumption Request message is sent when the PLMN reselects EPLMN or the PLMN reselects EPLMN and meanwhile the RNA update conditions are met on the user's equipment, the RRC Resumption Request message carries a second cause value, which indicates that the user's equipment has uplink data transmission or uplink signaling transmission. It should be noted that the second cause value can reuse the current cause value; for example, the second cause value can be set to mo signaling or mo data. The network device, after receiving the RRC Resume Request message carrying a second cause value, can respond with an RRC resume message in response to the RRC resume request message sent to the user equipment. Furthermore, the user equipment can respond with an RRC full resume message in response to the RRC resume message sent to the network device. In addition, the NAS determines the second cause value on the user's equipment and provides it to the AS while providing a re-selected EPLMN identity; or, the NAS on the user's equipment determines the second cause value and provides it to the AS while providing a re-selected EPLMN identity to the AS, meanwhile, it activates the NAS signaling process, and the NAS signaling process is selected as a mobile registration update process, or core network tracking area update process, etc.; or, the AS determines the second cause value on the user's equipment after the NAS provides a re-selected EPLMN identity to the AS, i.e., after the NAS provides a re-selected EPLMN identity to the AS, the AS sets the second cause value. Or, when the RRC Resumption Request message is sent when the PLMN reselects EPLMN or the PLMN reselects EPLMN and meanwhile the RNA update conditions are met on the user's computer, the RRC Resumption Request message may carry a second cause value, which may indicate whether the PLMN reselects EPLMN on the user's computer. It should be noted that the indication information can be selected as 1-bit identification information. When a network device responds to a first RRC message in response to an RRC Resume Request message to the user equipment, it can determine the corresponding first RRC message based on the indication information carried in the RRC Resume Request message. For example, if the indication information shows that PLMN is being reselected to EPLMN on the user equipment, the network device can determine the first RRC message as an RRC Resume message, an RRC Release message, or a New_1 RRC message. In this specific embodiment of the present disclosure, considering the protocol requirements, when a network device broadcast PLMN list includes registered PLMNs (RPLMNs), the user computer cannot reselect any other PLMNs; that is, when the list excludes the user computer's RPLMN, the user computer can reselect EPLMNs, and therefore, through the RNAU process of relevant technologies, select an RRC message in response to an RRC Resume Request message through the user computer context per network device, so that the user computer can report the reselected EPLMN identity when PLMN reselects EPLMNs within it. Optionally, when the user equipment sends the RRC Resumption Request message upon meeting the RNA update conditions, the first RRC message can be sent with the condition that the network device considers the cellular broadcast PLMN list to be restored to exclude the user equipment's RPLMN. Furthermore, the first RRC message can be an RRC resumption message, and the second RRC message can be a full RRC resumption message. It can be understood that the same network device, such as a base station, can have several communities, while each can broadcast its own PLMN list; therefore, a network device can, based on a received RRC Resumption Request message, consider the corresponding communities to be reinstated from the relevant RRC resumption procedures. While the network is considering whether the cellular broadcast PLMN list to be restored includes the user equipment's RPLMN, a network device can send an RRC Release message to the user equipment, which keeps the RRC mode inactive for the time being. In this case, the user equipment will not select any other PLMNs again; that is, it will not reselect EPLMNs, so there is no need to report. In this way, the network device sends an RRC resumption message to determine if a broadcast PLMN list includes RPLMN; it can be realized that the identity of the re-selected EPLMN is reported when the PLMN re-selects EPLMN. In carrying out this disclosure, the user team can report the identity of the re-selected EPLMN through the initiated RRC resumption procedure, or they can initiate a new RRC reporting procedure, which is detailed below. As shown in FIG. 2, the implementation of this disclosure also provides a method of information notification, applied to user equipment, and the method includes the following steps: Step 201: Send a third RRC message carrying the EPLMN identity to a network device when PLMN reselects EPLMN or PLMN reselects EPLMN and the RNA update conditions are met in case the user equipment is in idle mode. The third RRC message can be selected as a new RRC message, such as New Message_4 RRC. For accurate identification and verification, the third RRC message can carry an EPLMN identity and at least one of the following as well: User machine identifier, Message Auth-Integrity Code (MAC-I), and truncated MAC-I. It can be understood that, in a specific implementation, the third RRC message may carry MAC-I or truncated MAC-I. And by using MAC-I or truncated MAC-I, it is possible to verify that the user's computer identifier is accurate. The user equipment identifier can be at least one of the following: Idle Radio Network Temporary Identifier (I-RNTI), Resume ID, EU Context ID, and 5G S-Temporary Mobile Subscription Identifier (5G-S-TMSI). Optionally, after step 201, the method also includes: The user equipment receives a fourth RRC message or an RRC Release message from the network device in response to the third RRC message. The fourth RRC message can be selected as a new RRC message, such as New Message_5 RRC. In this way, through a fourth RRC message or RRC Release message, the user equipment can learn the identity of the re-selected EPLMN obtained by the network device to ensure relevant communication performance. It is understandable that the new RRC Procedure in the realizations of this disclosure may be a realization procedure (one-step process) using a third RRC message (such as New Message_4 RRC), or using a third RRC message (such as New Message_4 RRC) and a current RRC release message (MSG4), or using a third RRC message (such as New Message_4 RRC) and a fourth RRC message (New Message_5 RRC). In this way, when the PLMN re-selects EPLMN, or the PLMN re-selects EPLMN and the RNA update conditions are met at the same time in the case that the user equipment is in idle mode, it can be done that the identity of the re-selected EPLMN is reported by an RRC message directly, to reduce signaling overheads, guarantee communication performance under the condition of meeting the identity reporting requirements of the re-selected EPLMN. The process for reporting information for realizations 1 to 5 of this disclosure is described in detail below with reference to FIG.3-7. Implementation 1 According to embodiment 1, the idle user equipment can report a reselected EPLMN identity by initiating an RRC Resumption Procedure, while at the start, the corresponding RRC Resumption Request messages can carry new cause values. The network device in the embodiment can be a base station, an NG-RAN node, etc. As shown in FIG. 3, a corresponding information notification procedure may include the following stages: Step 31: The inactive EU monitors whether PLMN reselection occurs and whether the RNA update conditions are met, where when the PLMN reselects EPLMN, or the PLMN reselects EPLMN and the RNA update conditions are met simultaneously, the EU may initiate an RRC resumption procedure at a base station. Step 32: When the PLMN reselects EPLMN, or the PLMN reselects EPLMN and the RNA update conditions are met simultaneously, the EU sends an RRC Resumption Request message to a base station, where the request message can carry a first cause value, which can be used to indicate PLMN reselects EPLMN, or PLMN reselects EPLMN and RNA update conditions are met simultaneously at the UE. Optionally, the description of the first cause value may refer to that in FIG. 1 of the embodiment. The details are not described here. Step 33: After receiving an RRC Resumption Request message, a base station reads the first cause value in it and responds to the EU with a first RRC message in response to the RRC Resumption Request message; where, the first RRC message can be selected as an RRC resumption message, RRC release message, or New RRC Message_1. Step 34: If the EU receives an RRC Resume message, it responds with a full RRC Resume message to the base station. The full RRC Resume message carries the EPLMN identity (PLMN ID), and the EU enters RRC Connected mode. Step 35: If the EU receives an RRC Release message, and the message carries suspend configuration information, including wireless resource configuration information, which may indicate wireless resources, the EU responds with a new RRC _2 message to the base station. The new RRC _2 message carries the EPLMN ID, and the EU maintains RRC Inactive mode. Step 36: If it receives New _1 RRC message, then the EU responds New _3 RRC message in response to an RRC resume message to the base station; where, the new _3 RRC message carries the EPLMN ID and the EU maintains an inactive RRC mode. Implementation 2 According to embodiment 2, the idle user equipment can report a reselected EPLMN identity by initiating an RRC Resumption Procedure, while at the start, the corresponding RRC Resumption Request messages can carry new cause values. The network device in the embodiment can be a base station, an NG-RAN node, etc. As shown in FIG. 4, a corresponding information notification procedure may include the following stages: Step 41: The inactive EU monitors whether PLMN reselection occurs and whether RNA update conditions are met, where when PLMN reselects EPLMN, or PLMN reselects EPLMN and RNA update conditions are met simultaneously, the EU may initiate an RRC resumption procedure to a base station. Step 42: When the PLMN reselects EPLMN, or the PLMN reselects EPLMN and the RNA update conditions are simultaneously met, the EU sends an RRC Resumption Request message to a base station, where the request message may carry a second cause value, which can be used to indicate that the EU has uplink data transmission or uplink signaling transmission, which can be configured as mo signaling or mo data. Optionally, the description of the second cause value may refer to that in FIG. 1 of the embodiment. The details are not described here. Step 43: After receiving an RRC Resumption Request message, a base station reads the second cause value in it and responds to the EU with a first RRC message in response to the RRC Resumption Request message. Step 44: After receiving an RRC resume message, the EU responds with a full RRC resume message in response to an RRC resume message to the base station; where, the full RRC resume message carries the EPLMN ID and the EU enters an RRC-connected mode. Implementation 3 According to embodiment 3, the idle user equipment can report a reselected EPLMN identity by initiating an RRC Resumption Procedure, while at the start, the corresponding RRC Resumption Request messages can carry indication information to show whether the PLMN reselects EPLMN. The network device in the embodiment can be a base station, an NG-RAN node, etc. As shown in FIG. 5, a corresponding information notification procedure can include the following steps: Step 51: The inactive EU monitors whether PLMN reselection occurs and whether the RNA update conditions are the same, where when PLMN reselects EPLMN, or PLMN reselects EPLMN and the RNA update conditions are met simultaneously, the EU can initiate an RRC resumption procedure to a base station. Step 52: When the PLMN reselects EPLMN, or the PLMN reselects EPLMN and the RNA update conditions are simultaneously met, the EU sends an RRC Resumption Request message to a base station, where the request message may carry indication information to indicate whether the PLMN reselects EPLMN, and the information may be 1-bit identification information. Step 53: After receiving an RRC Resume Request message, a base station reads the cause value and 1-bit identification information in it, and responds to the EU with a first RRC message in response to the RRC Resume Request message, where the first RRC message can be selected as an RRC Resume Request message, an RRC release message, or a New RRC Message_1. Step 54: If it receives an RRC resume message, the EU responds with a full RRC resume message in response to an RRC resume message to the base station; where, the full RRC resume message carries the EPLMN ID and the EU enters an RRC-connected mode. Step 55: If you receive an RRC Release message, and the message carries suspend configuration information that includes wireless resource configuration information, which may indicate wireless resources, then the EU responds New _2 RRC message in response to an RRC Resume message to the base station; where, the new _2 RRC message carries the EPLMN ID and the EU maintains an inactive RRC mode. Step 56: If it receives New _1 RRC message, then the EU responds New _3 RRC message in response to an RRC resume message to the base station; where, the new _3 RRC message carries the EPLMN ID and the EU maintains an inactive RRC mode. Implementation 4 According to embodiment 4, the idle user equipment can report a reselected EPLMN identity by initiating an RRC Resumption Procedure, which may adopt an RNAU mechanism in the relevant technologies. The network device in this embodiment may be a base station, an NG-RAN node, etc. As shown in FIG. 6, a corresponding information notification procedure may include the following stages: Step 61: The inactive EU monitors whether the RNA update conditions are met, where when the RNA update conditions are met, the EU can initiate an RRC resumption procedure at a base station. Step 62: When the RNA update conditions are met, the EU sends an RRC Resumption Request message to the base station, where the Request message may carry a cause value, which may be set as RNAU. Step 63: After receiving an RRC Resumption Request message, a base station initiates the EU context acquisition procedure, where the EU context acquired may include a PLMN broadcast list from the base station. Step 64: The base station considers whether the cell diffusion PLMN list to be restored includes the UE's RPLMN. Step 65: If the RPLMN is excluded from the UE, the base station responds with an RRC Resumption message in response to an RRC Resumption Request message to the UE. Step 66: If the UE's RPLMN is included, the base station responds with an RRC Release message (MSG4) in response to an RRC Resume Request message to the UE, where the MSG4 can carry suspension configuration information (same as the mechanism of the corresponding technologies), and the EU maintains an inactive RRC mode. Step 67: After receiving an RRC resume message, the EU responds with a full RRC resume message in response to an RRC resume message to the base station, where upon initiating step 62, the NAS in the EU provides a re-selected PLMN ID to the AS, then the full RRC resume message carries the EPLMN ID; otherwise, it does not carry any EPLMN ID; the EU enters a connected RRC mode. Implementation 5 According to embodiment 5, the inactive user equipment can report a reselected EPLMN identity using a new RRC procedure. As shown in FIG. 7, a corresponding information notification procedure may include the following steps: Step 71: The inactive EU monitors whether PLMN reselection occurs and whether the RNA update conditions are met, where when the PLMN reselects EPLMN, or the PLMN reselects EPLMN and the RNA update conditions are met simultaneously, the EU can initiate a new RRC procedure at a base station. Step 72: If the PLMN reselects EPLMN, or if the PLMN reselects EPLMN and the RNA update conditions are simultaneously met, then the EU sends a New_4 RRC message to the base station; where the New_4 RRC message carries at least the ID of the reselected EPLMN. Step 73: The base station responds to the EU's New_5 RRC message in response to the New_4 RRC message, or an RRC Release message (MSG4, the same mechanism as the corresponding technologies) carrying suspension information, and the EU maintains an inactive RRC mode. As shown in FIG. 8, the realizations of the present disclosure also provide a method of receiving information, applied to a network device, and the method includes the following steps: Step 801: Receive an RRC Resumption Request message sent by the user's computer. Step 802: Send a first RRC message corresponding to the RRC Resumption Request message to the user's computer. Step 803: Receive a second RRC message sent by the user equipment in response to the first RRC message. In the event that the user equipment is in idle mode, the PLMN reselects EPLMN, or the PLMN reselects EPLMN and the RNA update conditions are met, the second RRC message carries the EPLMN identity. In the realizations of this present disclosure, an RRC resumption procedure is initiated through the user equipment when the PLMN reselects EPLMN, or when the PLMN reselects EPLMN and the RNA update conditions are met. The user equipment can report the identity of the reselected EPLMN by notifying RRC information to inform the network device of the identity of the reselected EPLMN even if the PLMN reselects EPLMN and the RNA update conditions are met simultaneously in the case that the user equipment is in idle mode, i.e., in the case of any reselection of PLMN to EPLMN, the identity of the reselected EPLMN can be reported to ensure that the network device can obtain the identity of the reselected EPLMN in a timely manner to ensure the performance of the related communication. In this specific embodiment of the present disclosure, optionally, when the user team sends the RRC Resumption Request message when the PLMN reselects EPLMN, or the PLMN reselects EPLMN and the RNA update conditions are met at the same time; The RRC Resumption Request message carries a first cause value, which is used to indicate that the PLMN is being reselected to EPLMN on the user computer, or that the PLMN is being reselected to EPLMN and the RNA update conditions are met; Alternatively, the RRC Resume Request message carries a second cause value, which is used to indicate that the user equipment has uplink data transmission or uplink signaling transmission; Alternatively, the RRC Resumption Request message carries indication information, which is used to indicate whether the PLMN reselects EPLMN on the user computer. Optionally, the first RRC message is a full RRC message, the second RRC message is a full resumed RRC message; Alternatively, the first RRC message is an RRC Release message, which carries suspend configuration information that includes wireless resource configuration information, indicating the resources occupied by the second RRC information. Optionally, when the RRC Resumption Request message carries the first cause value, which is determined by the user equipment's Non-Access Stratum (NAS), and is provided to AS when NAS provides the re-selected EPLMN identity to the Access Stratum (AS); Alternatively, the first cause value is determined by the user team's AS after the NAS provides the identity of the re-selected EPLMN to the AS. Optionally, when the RRC Resumption Request message carries the second cause value, which is determined by the user equipment's NAS, and is provided to AS when NAS provides the identity of the re-selected EPLMN to AS; Or, the second cause value is determined by NAS on the user equipment and provided to AS while providing a re-selected EPLMN identity to S, meanwhile, triggering the NAS signaling process; Alternatively, the second cause value is determined by the user team's AS after NAS provides the identity of the re-selected EPLMN to the AS. Optionally, the user equipment sends the RRC Resumption Request message when the RNA update conditions are met; the first RRC message is sent on the condition that the network device considers the cellular broadcast PLMN list to be restored to exclude the user equipment's RPLMN. As shown in FIG. 9, the embodiments of this disclosure also provide a method for receiving information, applied to a network device, and the method includes the following steps: Step 901: Receive a third RRC message carrying the EPLMN identity when PLMN reselects EPLMN, or PLMN reselects EPLMN and the RNA update conditions are met in the case that the user equipment is in idle mode. Optionally, the third RRC message also carries at least one of the following information: user computer identifier, MAC-I, and truncated MAC-I. Optionally, after step 901, the method also includes: send a fourth RRC message or an RRC Release message corresponding to the third RRC message to the user equipment. In this way, when the PLMN re-selects EPLMN, or the PLMN re-selects EPLMN and the RNA update conditions are met at the same time in the case that the user equipment is in idle mode, it can be realized that the identity of the re-selected EPLMN is reported by an RRC message directly, to reduce signaling overheads, guarantee communication performance under the condition of meeting the identity reporting requirements of the re-selected EPLMN. The method for notifying and receiving information in this disclosure is described in the preceding embodiment. The user equipment and network device in this disclosure are described below with reference to accompanying embodiments and drawings. Referring to FIG. 10, one implementation of this disclosure further provides the user kit 10, which includes: a first sending module 11, configured to send an RRC Resumption Request message to a network device; a first receiving module 12, configured to receive a first RRC message sent by the network device in response to the RRC Resume Request message; and a second sending module 13, configured to send a second RRC message in response to the first RRC message to the network device, where In the event that the user equipment is in idle mode, when the PLMN reselects EPLMN, or the PLMN reselects EPLMN and the RNA update conditions are met, the second RRC message carries the EPLMN identity. In the realizations of this present disclosure, an RRC resumption procedure is initiated through the user equipment when the PLMN reselects EPLMN, or when the PLMN reselects EPLMN and the RNA update conditions are met. The user equipment can report the identity of the reselected EPLMN by notifying RRC information to inform the network device of the identity of the reselected EPLMN even if the PLMN reselects EPLMN and the RNA update conditions are met simultaneously in the case that the user equipment is in idle mode, i.e., in the case of any reselection of PLMN to EPLMN, the identity of the reselected EPLMN can be reported to ensure that the network device can obtain the identity of the reselected EPLMN in a timely manner to ensure the performance of the related communication. In this specific embodiment of the present disclosure, optionally, when the user team sends the RRC Resumption Request message when the PLMN reselects EPLMN, or the PLMN reselects EPLMN and the RNA update conditions are met at the same time; The RRC Resumption Request message carries a first cause value, which is used to indicate that the PLMN is being reselected to EPLMN on the user computer, or that the PLMN is being reselected to EPLMN and the RNA update conditions are met; or, the RRC Resume Request message carries a second cause value, which is used to indicate that the user equipment has uplink data transmission or uplink signaling transmission; Or, the RRC Resumption Request message carries indication information, which is used to indicate whether the PLMN reselects EPLMN on the user computer. Optionally, the first RRC message is an RRC resume message and the second RRC message is a full RRC resume message; Alternatively, the first RRC message is an RRC Release message, which carries suspend configuration information that includes wireless resource configuration information, indicating the resources occupied by the second RRC information. Optionally, when the RRC Resumption Request message carries the first cause value, which is determined by the user equipment's Non-Access Stratum (NAS), and is provided to AS when NAS provides the re-selected EPLMN identity to the Access Stratum (AS); Or, the first cause value is determined by the user team's AS after NAS provides the identity of the re-selected EPLMN to the AS. Optionally, when the RRC Resumption Request message carries the second cause value, which is determined by the user equipment's NAS, and is provided to AS when NAS provides the identity of the re-selected EPLMN to AS; Or, the second cause value is determined by the user equipment's NAS and provided to the AS while providing a re-selected EPLMN identity to the AS, meanwhile, triggering the NAS signaling process; Alternatively, the second cause value is determined by the user team's AS after NAS provides the identity of the re-selected EPLMN to the AS. Optionally, the user team sends the RRC Resumption Request message when the RNA update conditions are met; The first RRC message is sent on the condition that the network device considers that the cellular broadcast PLMN list to be restored excludes the user equipment's RPLMN. As shown in FIG. 11, the realizations of this disclosure also provide the user equipment 110, which includes: a third 111 sending module, configured to: in case the user equipment is in idle mode, when the PLMN reselects EPLMN, or the PLMN reselects EPLMN and the RNA update conditions are met, send a third RRC message carrying the EPLMN identity to the network device. Optionally, the third RRC message also carries at least one of the following information: user computer identifier, MAC-I, and truncated MAC-I. Optionally, the user kit also includes: a fifth receiving module, configured to receive a fourth RRC message or RRC Release message sent by the network device in response to the third RRC message. In this way, when the PLMN re-selects EPLMN, or the PLMN re-selects EPLMN and the RNA update conditions are met at the same time in the case that the user equipment is in idle mode, it can be done that the identity of the re-selected EPLMN is reported by an RRC message directly, to reduce signaling overheads, guarantee communication performance under the condition of meeting the identity reporting requirements of the re-selected EPLMN. As shown in FIG. 12, the embodiments of this disclosure also provide a 120 network device, which includes: a second 121 receiving module, configured to receive an RRC Resumption Request message sent by the user's equipment; a fourth 122 sending module, configured to send an initial RRC message in response to the RRC Resume Request message to the user computer; and a third 123 receive module, configured to receive a second RRC message sent by the user equipment in response to the first RRC message, where In the event that the user equipment is in idle mode, when the PLMN reselects EPLMN, or the PLMN reselects EPLMN and the RNA update conditions are met, the second RRC message carries the EPLMN identity. Optionally, the user team sends the RRC Resumption Request message when the PLMN reselects EPLMN, or the PLMN reselects EPLMN and the RNA update conditions are met simultaneously. The RRC Resumption Request message carries a first cause value, which is used to indicate that the PLMN is being reselected to EPLMN on the user computer, or that the PLMN is being reselected to EPLMN and the RNA update conditions are met; or, the RRC Resume Request message carries a second cause value, which is used to indicate that the user equipment has uplink data transmission or uplink signaling transmission; Or, the RRC Resumption Request message carries indication information, which is used to indicate whether the PLMN reselects EPLMN on the user computer. Optionally, the first RRC message is an RRC resume message, the second RRC message is a full RRC resume message; or the first RRC message is an RRC Release message, which carries suspend configuration information that includes wireless resource configuration information, indicating the resources occupied by the second RRC information. Optionally, when the RRC Resumption Request message carries the first cause value, which is determined by the user equipment's Non-Access Stratum (NAS), and is provided to AS when NAS provides the re-selected EPLMN identity to the Access Stratum (AS); Or, the first cause value is determined by the user team's AS after NAS provides the identity of the re-selected EPLMN to the AS. Optionally, when the RRC Resumption Request message carries the second cause value, which is determined by the user equipment's NAS, and is provided to AS when NAS provides the identity of the re-selected EPLMN to AS; Or, the second cause value is determined by the user equipment's NAS and provided to the AS while providing a re-selected EPLMN identity to the AS, meanwhile, triggering the NAS signaling process; Alternatively, the second cause value is determined by the user team's AS after NAS provides the identity of the re-selected EPLMN to the AS. Optionally, the user team sends the RRC Resumption Request message when the RNA update conditions are met. The first RRC message is sent on the condition that the network device considers that the cellular broadcast PLMN list to be restored excludes the user equipment's RPLMN. As shown in FIG. 13, the embodiments of this disclosure also provide a network device 130, which includes: a fourth 131 receive module, configured to receive a third RRC message carrying the EPLMN identity from the user equipment that is in idle mode when PLMN reselects EPLMN, or PLMN reselects EPLMN and the RNA update conditions are met. Optionally, the third RRC message also carries at least one of the following information: user computer identifier, MAC-I, and truncated MAC-I. Optionally, the 130 network device also includes: a fifth sending module, configured to send a fourth RRC message or RRC Release message to the user computer in response to the third RRC message. In this way, when the PLMN re-selects EPLMN, or the PLMN re-selects EPLMN and the RNA update conditions are met at the same time in the case that the user equipment is in idle mode, it can be done that the identity of the re-selected EPLMN is reported by an RRC message directly, to reduce signaling overheads, guarantee communication performance under the condition of meeting the identity reporting requirements of the re-selected EPLMN. An embodiment of this disclosure further provides user equipment, including a processor, memory, and a computer program stored in memory and executable on the processor, wherein the program, when executed by the processor, implements stages of the information notification method applied to the user equipment and the same technical effect can be achieved. To avoid repetition, the details are not described again here. Specifically, FIG. 14 is a schematic structural diagram of the user equipment hardware implementing embodiments of this disclosure. The user equipment 1400 includes, but is not limited to: a radio frequency unit 1401, a network module 1402, an audio output unit 1403, an input unit 1404, a sensor 1405, a display unit 1406, a user input unit 1407, an interface unit 1408, a memory 1409, a processor 1410, a power supply 1411, and other components. A person skilled in the art may understand that the structure of the user equipment shown in FIG. 14 does not constitute a limitation for the user equipment; the user equipment may include more or fewer components than those shown in the figure, some components may be combined, or there may be a different arrangement of components.In this implementation of the present disclosure, user equipment includes, but is not limited to, a mobile phone, a tablet, a laptop computer, a handheld computer, a vehicle-mounted user equipment, a wearable device, a pedometer, or similar items. The 1401 radio frequency unit is configured to send an RRC Resume Request message to a network device, receive a first RRC message sent by the network device in response to the RRC Resume Request message, send a second RRC message in response to the first RRC message to the network device; when the PLMN reselects EPLMN, or the PLMN reselects EPLMN and the RNA update conditions are met at the same time in the case that the user equipment is in idle mode, the second RRC message carries the EPLMN identity. Or, the radio frequency unit 1401 is configured to send a third RRC message carrying the EPLMN identity to the network device when PLMN reselects EPLMN, or PLMN reselects EPLMN and the RNA update conditions are met simultaneously in a case where the user equipment is in idle mode. In the implementations of this disclosure, an RRC resumption procedure is initiated through the user equipment 1400 when the PLMN reselects EPLMN, or when the PLMN reselects EPLMN and the RNA update conditions are met simultaneously. The user equipment 1400 can report the identity of the reselected EPLMN by means of RRC information notification. This allows the network device to be informed of the identity of the reselected EPLMN even if the PLMN reselects EPLMN and the RNA update conditions are met simultaneously, in the event that the user equipment is in idle mode. That is, in the case of any reselection of PLMN to EPLMN, the identity of the reselected EPLMN can be reported to ensure that the network device can promptly obtain the identity of the reselected EPLMN to guarantee the performance of the related communication. It can be understood that, in this embodiment of the present disclosure, the radio frequency unit 1401 can be used to receive or transmit information or to receive or transmit signals during calls. Specifically, after receiving downlink data from a base station, it sends this data to the processor 1410 for processing; it also sends uplink data to a base station. Generally, the radio frequency unit 1401 includes, among other things, an antenna, at least one amplifier, a transceiver, a coupler, a low-noise amplifier, a duplexer, and similar components. Furthermore, the radio frequency unit 1401 can also communicate with a network and other devices using a wireless communication system. The user equipment provides the user with wireless access to broadband Internet via the 1402 network module, for example, helping the user to send and receive emails, browse web pages, and access streaming media. The audio output unit 1403 can convert audio data received by the radio frequency unit 1401 or the network module 1402, or stored in memory 1409, into an audio signal and output the audio signal as sound. In addition, the audio output unit 1403 can provide further audio output (for example, ringing or message reception sounds) related to a specific function performed by the user equipment 1400. The audio output unit 1403 includes a speaker, a buzzer, a telephone receiver, and similar components. The input unit 1404 is configured to receive audio or radio signals. The input unit 1404 may include a graphics processing unit 14041 (Graphics Processing Unit, GPU) and a microphone 14042. The graphics processing unit 14041 processes image data from a still image or video obtained by an image capture device (such as a camera) in either video capture mode or image capture mode. A processed image frame can be displayed on the display unit 1406. Image frames processed by the GPU 14041 can be stored in memory 1409 (or other storage media) or transmitted via the radio frequency unit 1401 or the network module 1402. The microphone 14042 can receive sound and process it into audio data.The processed audio data can be converted into a format that can be sent to a mobile communications base station via the radio frequency unit 1401 in a telephone call mode, for output. The user device 1400 also includes at least one sensor 1405, for example, a light sensor, a motion sensor, and other sensors. Specifically, the light sensor includes an ambient light sensor and a proximity sensor, where the ambient light sensor can adjust the brightness of the display panel 14061 based on the ambient light brightness, and the proximity sensor can turn off the display panel 14061 and / or the backlight when the user device 1400 is moved toward the ear.As a motion sensor, an accelerometer can detect the magnitude of acceleration in various directions (typically three axes), detect the magnitude and direction of gravity when stationary, and can be configured to identify user equipment positions (such as horizontal and vertical screen switching, related games, and magnetometer posture calibration), vibration from related functions (such as pedometers and percussion sensors), and the like. The 1405 sensor may also include a fingerprint sensor, pressure sensor, iris sensor, molecular sensor, gyroscope, barometer, hygrometer, thermometer, infrared sensor, or similar sensors. Details are not described here. The 1406 display unit is configured to display user-entered or user-provided information. The 1406 display unit may include the 14061 display panel, and the 14061 display panel may be configured as a liquid crystal display (LCD), an organic light-emitting diode (OLED), or similar. The 1407 user input unit can be configured to receive numeric or character input and generate key signal inputs related to user settings and control of user equipment functions. Specifically, the 1407 user input unit includes a 14071 touch panel and another 14072 input device. The 14071 touch panel, also called a touchscreen, can collect a user's touch operation on or near the 14071 touch panel (for example, the user uses any suitable object or accessory, such as a finger or stylus, to operate on or near the 14071 touch panel). The 14071 touch panel can include two parts: a touch sensing device and a touch controller. The touch sensing device detects a user's touch position, detects a signal generated by a touch operation, and transmits the signal to the touch controller.The touch controller receives touch information from the touch sensing device, converts the touch information into touch coordinates, sends the touch coordinates to the 1410 processor, and receives and executes a command from the 1410 processor. Furthermore, the 14071 touch panel can be implemented using a variety of types, such as resistive, capacitive, infrared, and acoustic surface waves. In addition to the 14071 touch panel, the 1407 user input unit can also include another 14072 input device. Specifically, the other 14072 input devices can include, but are not limited to, a physical keyboard, function keys (such as a volume control key and a power button), a scroll wheel, a mouse, and a joystick. Details are not described here. Furthermore, the touch panel 14071 can cover the display panel 14061. After detecting a touch operation on or near the touch panel 14071, the touch panel 14071 transmits the touch operation to the processor 1410 to determine the type of touch event. The processor 1410 then provides the corresponding visual output on the display panel 14061 based on the type of touch event. Although in Figure 14, the touch panel 14071 and the display panel 14061 are configured as two independent components to implement user equipment input and output functions, in some embodiments, the touch panel 14071 and the display panel 14061 can be integrated to implement user equipment input and output functions. Details are not exhaustive here. The 1408 interface unit is an interface for connecting an external device to the 1400 user computer. For example, the external device might include a wired or wireless headphone port, an external power supply port (or battery charger), a wired or wireless data port, a storage card port, a port used to connect to a device with an identity module, an audio input / output (I / O) port, a video I / O port, a headphone port, and the like. The 1408 interface unit can be configured to receive input (for example, data and power information) from the external device and transmit the received input to one or more elements on the 1400 user computer, or transmit data between the 1400 user computer and the external device. Memory 1409 can be configured to store software programs and various data. Memory 1409 may primarily include a program storage area and a data storage area. The program storage area may store an operating system, an application program required by at least one function (such as a sound playback function and an image playback function), and similar items. The data storage area may store data (such as audio data and a phonebook) generated based on mobile phone usage and similar activities. Additionally, memory 1409 may include high-speed random-access memory or non-volatile memory, for example, at least one disk storage device, external memory, or other solid-state volatile storage device. The 1410 processor is the control center for the user computer. It uses various interfaces and lines to connect the different parts of the user computer, performs various user computer functions, and processes data by executing software programs and / or modules stored in memory 1409 and retrieving data stored in memory 1409 to monitor the user computer as a whole. The 1410 processor may include one or more processing units. Optionally, it can be integrated with an application processor and a modem processor. The application processor primarily handles the operating system, user interface, applications, etc. The modem processor primarily handles wireless communication. It should be understood that the modem processor may not be integrated into the 1410 processor. The user equipment 1400 may also include a power source 1411 (e.g., a battery) that supplies power to various components. Optionally, the power source 1411 may be logically connected to the processor 1410 via a power supply management system to perform charge, discharge, and power consumption management functions. In addition, the user equipment 1400 may also include some functional modules not shown. Details of these are not described here. An embodiment of this disclosure further provides a network device, including a processor, memory, and a computer program stored in memory and executable by the processor, wherein the program, when executed by the processor, implements stages of the information notification method applied to a network device, and the same technical effect can be achieved. To avoid repetition, the details are not described again here. Specifically, FIG. 15 is a schematic diagram of a hardware structure of a network device according to various embodiments of this disclosure. The network device 150 includes, among other things, a bus 151, a transceiver 152, an antenna 153, a bus interface 154, a processor 155, and a memory 156. In this embodiment of the present disclosure, the network device 150 further includes: a computer program stored in memory 156 and executable on the processor 155. Optionally, when the computer program is executed by the processor 155, the following additional step may be implemented: control transceiver 152 to receive an RRC Resume Request message sent by the user equipment, send a first RRC message in response to the RRC Resume Request message to the user equipment, and receive a second RRC message in response to the first RRC message from the user equipment, where In the event that the user equipment is in idle mode, when the PLMN reselects EPLMN, or the PLMN reselects EPLMN and the RNA update conditions are met, the second RRC message carries the EPLMN identity. Optionally, when the computer program is executed by the 155 processor, the following additional step can be implemented: control transceiver 152 to receive a third RRC message carrying the EPLMN identity from the user equipment when PLMN reselects EPLMN, or PLMN reselects EPLMN and the RNA update conditions are met simultaneously in the case of the user equipment being in idle mode. Transceiver 152 is configured to receive and send data under the control of processor 155. In FIG. 15, for a bus architecture (represented by bus 151), bus 151 can include any number of interconnecting buses and bridges, and bus 151 interconnects various circuits of one or more processors, represented by processor 155, and a memory, represented by memory 156. Bus 151 can also connect several other circuits, such as a peripheral device, a voltage regulator, and a power management circuit. All of these are well known in the art. Therefore, this descriptive note provides no further description. Bus interface 154 provides an interface between bus 151 and transceiver 152. Transceiver 152 can be one or more elements, for example, a plurality of receivers and transmitters, and provides a unit configured to communicate with various other devices on a transmission medium.The data processed by processor 155 is transmitted over a radio medium using antenna 153. Antenna 153 also receives data and transmits it to processor 155. The processor 155 is responsible for managing bus 151 and general processing, and can also provide various functions, including timing, peripheral interface, voltage regulation, power management, and other control functions. Memory 156 can be configured to store data used by the processor 155 when performing an operation. Optionally, the 155 processor can be a CPU, an ASIC, an FPGA, or a CPLD. An embodiment of this disclosure further provides a computer-readable storage medium that stores a computer program, where the program, when executed by the processor, implements stages of the information notification method applied to the user's equipment, and the same technical effect can be achieved. To avoid repetition, the details are not described again here. The computer-readable storage medium is, for example, read-only memory (ROM), random-access memory (RAM), a magnetic disk, or an optical disk. An embodiment of this disclosure further provides a computer-readable storage medium that stores a computer program, where the program, when executed by the processor, implements stages of the information reception method applied to a network device, and the same technical effect can be achieved. To avoid repetition, the details are not described again here. The computer-readable storage medium is, for example, read-only memory (ROM), random-access memory (RAM), a magnetic disk, or an optical disk. It should be noted that, in this descriptive report, the terms "comprises," "includes," and any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or apparatus that includes a set of elements not only includes those elements themselves, but may also include other elements not expressly listed, or even elements inherent to that process, method, article, or apparatus. In the absence of further limitations, an element defined by "including a..." does not preclude the existence of other identical elements in the process, method, article, or apparatus that includes the element. From the preceding description of the embodiments, a person skilled in the art can clearly understand that the method in the above embodiments can be implemented using software with a general hardware platform. Certainly, the method in the above embodiments can also be implemented using hardware. However, in many cases, the former is a preferred embodiment. Based on this understanding, the technical solutions in this disclosure, or the portion that contributes to the related technologies, can be implemented as a software product.The computer software product is stored on a storage medium (e.g., ROM / RAM, magnetic disk, or compact disc) and includes a plurality of instructions to instruct the user's equipment (which may be a mobile phone, computer, server, air conditioner, network device, or similar) to perform the method described in the embodiments of this disclosure.

Claims

1. A method of information notification, applied to the user equipment (10) and comprising: sending a Radio Resource Control Resumption Request (RRC) message to a network device (120), (101); receiving a first RRC message sent by the network device (120) in response to the RRC Resumption Request message (102); and sending a second RRC message in response to the first RRC message to the network device (120), (103), wherein in the event that the user equipment (10) is in idle mode, when a Public Land Mobile Network (PLMN) reselects an Equivalent Public Land Mobile Network (EPLMN), or when the PLMN reselects EPLMN and Radio Access Network Notification Area (RNA), the refresh conditions are met, the second RRC message carries the EPLMN identity information,The RRC Resumption Request message is sent by the user equipment (10) in the event that the PLMN reselects EPLMN, or the PLMN reselects EPLMN and the RNA update conditions are met; characterized in that the RRC Resumption Request message carries a cause value, which is used to indicate that the user equipment (10) has uplink data transmission or uplink signaling transmission, wherein the cause value is determined by the NAS of the user equipment (10), and is provided to AS when the NAS provides the reselected EPLMN identity information to the Non-Access Stratum, AS, and triggers a NAS signaling process, wherein the NAS signaling process is a roaming record update process or a core network trace area update process.

2. The method according to claim 1,wherein the first RRC message is an RRC resume message and the second RRC message is a full RRC resume message; or the first RRC message is an RRC release message, which carries suspend configuration information including radio resource configuration information, indicating the resources occupied by the second RRC message.

3. The method of claim 1, wherein the RRC Resume Request message is sent by the user equipment (10) when the RNA update conditions are met; the first RRC message is sent on the condition that the network device (120) considers the cellular broadcast PLMN list to be restored to exclude the RPLMN of the user equipment (10).

4. The method of claim 1, wherein the cause value is set to either mo signaling or mo data.

5. The method of claim 2,wherein the RRC release message is used to keep the user equipment (10) in idle mode.

6. The method according to claim 1, further comprising: entering an RRC connected mode.

7. A method of receiving information, applied to a network device (120) and comprising: receiving an RRC Resume Request message sent by the user equipment (10) (801); sending a first RRC message in response to the RRC Resume Request message to the user equipment (10) (802); and receiving a second RRC message sent by the user equipment (10) in response to the first RRC message (803), wherein if the user equipment (10) is in idle mode, when the PLMN reselects EPLMN, or the PLMN reselects EPLMN and the RNA update conditions are met, the second RRC message carries the EPLMN identity information,The RRC Resumption Request message is sent by the user equipment (10) in the event that the PLMN reselects EPLMN, or the PLMN reselects EPLMN and the RNA update conditions are met; characterized in that the RRC Resumption Request message carries a cause value, which is used to indicate that the user equipment (10) has uplink data transmission or uplink signaling transmission, wherein the cause value is determined by the NAS of the user equipment (10), and is provided to AS when the NAS provides the reselected EPLMN identity information to the Non-Access Stratum, AS, and triggers a NAS signaling process, wherein the NAS signaling process is a roaming record update process or a core network trace area update process.

8. The method according to claim 7,wherein the first RRC message is an RRC resume message and the second RRC message is a full RRC resume message; or the first RRC message is an RRC release message, which carries suspend configuration information including radio resource configuration information, indicating the resources occupied by the second RRC message.

9. The method of claim 7, wherein the RRC Resume Request message is sent by the user equipment (10) when the RNA update conditions are met; and the first RRC message is sent on the condition that the network device considers the cellular broadcast PLMN list to be restored to exclude the RPLMN of the user equipment (10).

10. The method of claim 7, wherein the cause value is set to mo signaling or mo data.

11. The method of claim 8,wherein the RRC release message is used to keep the user equipment (10) in idle mode.

12. The method according to claim 7, wherein the RRC Resume Request message is used to enter the user equipment (10) into an RRC connected state.

13. A user device (1400), comprising a memory (1409), a processor (1410), and a program stored in the memory (1409) and executable on the processor (1410), wherein the program, when executed by the processor (1410), implements steps of the information notification method according to any one of claims 1 to 6.

14. A network device (150), comprising a memory (156), a processor (15), and a program stored in the memory (156) and executable on the processor (155), wherein the program, when executed by the processor (155),15. A computer-readable storage medium, which stores a computer program, wherein when the computer program is executed by a processor, the information notification method according to any of claims 1 to 6 is implemented, or the information reception method according to any of claims 7 to 12 is implemented.

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