Methods and apparatus for reliable warning message reception and indication in mobile communications
The method of requesting retransmission and indicating repeated messages improves warning message reliability and reduces power consumption in mobile communication systems, addressing issues of incomplete reception during RLF or OOS.
Patent Information
- Application Number
- PCT/CN2025/108984
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2024-07-31
- Filing Date
- 2025-07-17
- Publication Date
- 2026-02-05
AI Technical Summary
Existing mobile communication systems face challenges in ensuring reliable reception and indication of warning messages, particularly during Radio Link Failure (RLF) or Out of Service (OOS) conditions, leading to missed emergency alerts.
The proposed solution involves a user equipment (UE) requesting retransmission of missing warning messages through dedicated signaling or broadcast system information, and a network node transmitting repeated warning messages with control signaling to indicate whether they are new or repeated, allowing the UE to optimize reception.
Enhances the reliability of warning message reception by ensuring complete delivery even in challenging network conditions, reducing power consumption by avoiding redundant message reception.
Smart Images

Figure CN2025108984_05022026_PF_FP_ABST
Abstract
Description
METHODS AND APPARATUS FOR RELIABLE WARNING MESSAGE RECEPTION AND INDICATION IN MOBILE COMMUNICATIONSCROSS REFERENCE TO RELATED PATENT APPLICATION (S)
[0001] The present disclosure is part of a non-provisional application claiming the priority benefit of U.S. Patent Application No. 63 / 677,492, filed 31 July 2024, and U.S. Patent Application No. 63 / 677,493, filed 31 July 2024, the content of which herein being incorporated by reference in their entirety.TECHNICAL FIELD
[0002] The present disclosure is generally related to mobile communications and, more particularly, to reliable reception and indication of a warning message in mobile communications.BACKGROUND
[0003] Unless otherwise indicated herein, approaches described in this section are not prior art to the claims listed below and are not admitted as prior art by inclusion in this section.
[0004] The Public Warning System (PWS) was initially introduced during the Long-Term Evolution (LTE) phase as a communication mechanism to support the dissemination of alerts during disasters and emergency events. Since then, it has continued to develop based on later fifth-generation (5G) New Radio (NR) standards.
[0005] According to 3rd Generation Partnership Project (3GPP) specifications, the PWS supports two primary alerting systems: the Commercial Mobile Alert System (CMAS) , used predominantly in the United States, and the Earthquake and Tsunami Warning System (ETWS) , commonly adopted for seismic and tsunami alerts. The CMAS focuses on delivering Presidential Alerts, extreme threat notifications, and America's Missing: Broadcast Emergency Response (AMBER) Alerts, while the ETWS is designed to rapidly transmit initial warnings and follow-up messages in the event of natural disasters. By leveraging the low latency and high reliability characteristics of 5G networks, these alert or warning messages can be delivered to end users with greater timeliness and precision, thereby reinforcing public safety and enhancing emergency response capabilities.
[0006] Despite the standardized design and broad deployment of PWS mechanisms, there are still instances where the end user cannot receive the warning messages successfully. Accordingly, how to enhance the reliability of warning message reception and the warning message indication for the end user are important issues for the newly developed wireless communication network.SUMMARY
[0007] The following summary is illustrative only and is not intended to be limiting in any way. That is, the following summary is provided to introduce concepts, highlights, benefits and advantages of the novel and non-obvious techniques described herein. Select implementations are further described below in the detailed description. Thus, the following summary is not intended to identify essential features of the claimed subject matter, nor is it intended for use in determining the scope of the claimed subject matter.
[0008] An objective of the present disclosure is to propose solutions or schemes that address the aforementioned issues pertaining to reliable reception and indication of a warning message in mobile communications.
[0009] In one aspect, a method may involve an apparatus receiving an indication of a broadcast of a warning message from a network node. The method may also involve the apparatus transmitting a request message to the network node to request a retransmission of the warning message in an event that an incomplete reception of the warning message has been detected.
[0010] In one aspect, a method may involve a network node transmitting a warning message via broadcasting. The method may also involve the network node receiving a request message to request a retransmission of the warning message from an apparatus. The method may further involve the network node transmitting the warning message or at least one segment of the warning message to the apparatus via a dedicated signaling or broadcast system information.
[0011] In one aspect, a method may involve an apparatus receiving a control signaling from a network node. The control signaling may comprise a first indication bit indicating whether a warning message will be broadcast and a second indication bit indicating whether the warning message is a repeated message. The method may also involve the apparatus determining whether the warning message has been successfully received in an event that the first indication bit is set to indicate that the warning message will be broadcast and the second indication bit is set to indicate that the warning message is the repeated message. The method may further involve the apparatus determining not to receive the repeated message in an event that the warning message is determined to have been successfully received.
[0012] In one aspect, a method may involve a network node transmitting a first control signaling. The first control signaling may comprise a first indication bit indicating whether a warning message will be broadcast and a second indication bit indicating whether the warning message is a repeated message. The method may also involve the network node transmitting a first warning message via broadcasting in an event that the first indication bit in the first control signaling is set. The first warning message may be the repeated message in an event that the second indication bit in the first control signaling is set.
[0013] It is noteworthy that, although description provided herein may be in the context of certain radio access technologies, networks and network topologies such as LTE, LTE-Advanced, LTE-Advanced Pro, 5th Generation (5G) , New Radio (NR) , Internet-of-Things (IoT) and Narrow Band Internet of Things (NB-IoT) , Industrial Internet of Things (IIoT) , and 6th Generation (6G) , the proposed concepts, schemes and any variation (s) / derivative (s) thereof may be implemented in, for and by other types of radio access technologies, networks and network topologies. Thus, the scope of the present disclosure is not limited to the examples described herein.BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The accompanying drawings are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of the present disclosure. The drawings illustrate implementations of the disclosure and, together with the description, serve to explain the principles of the disclosure. It is appreciable that the drawings are not necessarily in scale as some components may be shown to be out of proportion than the size in actual implementation in order to clearly illustrate the concept of the present disclosure.
[0015] FIG. 1 is a diagram depicting an example scenario of warning message transmission.
[0016] FIG. 2 is a diagram depicting an example scenario in which the UE cannot receive the warning messages successfully.
[0017] FIG. 3 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0018] FIG. 4 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0019] FIG. 5 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0020] FIG. 6 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0021] FIG. 7 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0022] FIG. 8 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0023] FIG. 9 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0024] FIG. 10 is a diagram depicting an example process from the UE’s perspective with respect to reliable warning message reception in the first aspect of the present disclosure.
[0025] FIG. 11 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0026] FIG. 12 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0027] FIG. 13 is a diagram depicting an example scenario under schemes in accordance with implementations of the present disclosure.
[0028] FIG. 14 is a diagram depicting an example process from the UE’s perspective with respect to repeated warning message indication in the second aspect of the present disclosure.
[0029] FIG. 15 is a diagram depicting an example communication system having an example communication apparatus and an example network apparatus in accordance with an implementation of the present disclosure.
[0030] FIG. 16 is a diagram depicting an example process in accordance with an implementation of the present disclosure.
[0031] FIG. 17 is a diagram depicting another example process in accordance with an implementation of the present disclosure.
[0032] FIG. 18 is a diagram depicting another example process in accordance with an implementation of the present disclosure.
[0033] FIG. 19 is a diagram depicting another example process in accordance with an implementation of the present disclosure. DETAILED DESCRIPTION OF PREFERRED IMPLEMENTATIONS
[0034] Detailed embodiments and implementations of the claimed subject matters are disclosed herein. However, it shall be understood that the disclosed embodiments and implementations are merely illustrative of the claimed subject matters which may be embodied in various forms. The present disclosure may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments and implementations set forth herein. Rather, these exemplary embodiments and implementations are provided so that description of the present disclosure is thorough and complete and will fully convey the scope of the present disclosure to those skilled in the art. In the description below, details of well-known features and techniques may be omitted to avoid unnecessarily obscuring the presented embodiments and implementations. Overview
[0035] Implementations in accordance with the present disclosure relate to various techniques, methods, schemes and / or solutions pertaining to reliable reception and indication of the warning message in mobile communications. According to the present disclosure, a number of possible solutions may be implemented separately or jointly. That is, although these possible solutions may be described below separately, two or more of these possible solutions may be implemented in one combination or another.
[0036] The PWS is designed to rapidly broadcast emergency alerts to user equipment (UE) within a designated area during disasters or critical events, helping to ensure public safety. In 5G NR architecture, it utilizes an efficient control-plane signaling mechanism that allows the network (e.g., the BS or the gNB) to promptly wake devices and deliver warning messages with minimal latency.
[0037] When an emergency alert needs to be disseminated, the BS transmits the control signaling via Downlink Control Information (DCI) . This signaling may include a public warning indication, such as the etwsAndCmasIndication field, configured, for example, in DCI Format 1_0, and sent over the Physical Downlink Control Channel (PDCCH) . Upon detecting this indication, the UEs proceed to receive the relevant system information.
[0038] In some 5G implementations, the BS transmits the control signaling via a short message. For example, the indication etwsAndCmasIndication is embedded as a bit within the DCI's Short Message field, which may also carry supplementary information. This design supports both low-latency device wake-up and timely emergency signaling.
[0039] Once the UE decodes the PDCCH and confirms the validity of the indication etwsAndCmasIndication (e.g., when the bit is set to a predefined value such as ‘1’ ) , it begins receiving system information. Typically, the UE first obtains System Information Block Type 1 (SIB1) to acquire scheduling details for other SIBs that indicate or carry the warning message.
[0040] Depending on the network configuration, the alert content may reside in SIB6, SIB7, or SIB8. For example, the ETWS messages are generally carried in SIB6 and SIB7, while SIB8 is used for the CMAS alerts. The UE then reads the relevant SIBs as scheduled and determines how to present the warning based on parameters carried in the warning message.
[0041] FIG. 1 illustrates an example scenario 100 of warning message transmission. The UE may monitor the DCI to know whether the ETWS or CMAS (i.e., the PWS) warning message will be broadcast. Typically, the UE may monitor the etwsAndCmasIndication bit in Short Message field of the DCI to determine whether the ETWS or CMAS warning message will be broadcast. In an event that the etwsAndCmasIndication bit is set to ‘1’ , the UE may further receive the SIB1 to know the schedule of SIB6 / SIB7 / SIB8 that indicate or carry the ETWS or CMAS warning message. The UE may then receive the SIB6 / SIB7 / SIB8 as scheduled.
[0042] Generally, the SIB6 / SIB7 / SIB8 may follow the modification period of system information to start and end the broadcast. For example, the warning message broadcast time may be approximately equal to M times the system information modification period, where M may be a positive integer. In scenario 100, there may be eight transmission occasions for the warning message within the warning message broadcast time. Therefore, there may be eight SIB (e.g., the SIB6, SIB7 or SIB8) transmissions, and the SI period refers to the interval between two successive SIB transmissions.
[0043] Although the warning message may be broadcast one or more times within the warning message broadcast time, there are still instances where the UE cannot receive the warning messages successfully.
[0044] FIG. 2 illustrates an example scenario 200 in which the UE cannot receive the warning messages successfully. In scenario 200, the UE may monitor the DCI to know that the ETWS or CMAS warning message will be broadcast, but thereafter encounter Radio Link Failure (RLF) (e.g., when the UE is in Radio Resource Control (RRC) connected, i.e., RRC_CONNECTED) or Out of Service (OOS) (e.g., when the UE is in RRC_IDLE or RRC_INACTIVE) . Thus, the UE fails to receive the subsequent SIB which indicates or carries the warning message, such as the SIB6, SIB7, or SIB8. After coverage recovery or network connectivity recovery, if the BS has already stopped broadcasting the SIB6, SIB7, or SIB8, then the UE cannot receive the warning message. Failure to receive warning messages may lead to missed emergency alerts and pose a risk to user safety.
[0045] In a first aspect of the present disclosure, methods and apparatus for reliable warning message reception are proposed to enhance the reliability of warning message reception of the UE.
[0046] In the implementations in the first aspect of the present disclosure, upon detecting a missing or an incomplete reception of the warning message, the UE may request a retransmission or a broadcast of the SIB that has been broadcast recently, or request a retransmission or a broadcast of the SIB broadcast since a coordinated universal time (UTC) time. The UE may request in either idle / inactive mode or connected mode. After receiving the request from the UE, the network may send the warning message in the broadcast of the required SIB or in a dedicated message.
[0047] FIG. 3 illustrates an example scenario 300 under schemes in accordance with implementations of the present disclosure. In scenario 300, a partial format of an RRCSystemInfoRequest message with a new Information Element (IE) -requestPWS to request retransmission of the warning message is shown. The IE requestPWS may comprise information regarding at least one requested SIB (e.g., the requestSIB-List-r16 as depicted in FIG. 3) to request the SIB which indicates or carries the required warning message and an optional information regarding a UTC (e.g., the timeInfoUTC as depicted in FIG. 3) to request the SIBs since this UTC. The UTC may be set to the time when the UE starts to receive the DCI with the etwsAndCmasIndication bit being set to ‘1’ , or to the time when the UE starts RLF or OOS.
[0048] FIG. 4 illustrates an example scenario 400 under schemes in accordance with implementations of the present disclosure. In scenario 400, the UE in RRC_IDLE or RRC_INACTIVE may perform a random access channel (RACH) procedure and transmit the request message in the RACH procedure. The UE may transmit the preamble on the physical random access channel (PRACH) (i.e., the message 1 (MSG1) ) and receive a random access response (RAR) (i.e., the message 2 (MSG2) ) from the network node (e.g., the BS or the gNB) . The UE may then transmit the request message RRCSystemInfoRequest with the new IE requestPWS to request retransmission of the warning message, and receive the required SIB carrying the requested warning message.
[0049] In some implementations, the UE may start a timer, such as the timer Txyz depicted in FIG. 4, after sending the request message RRCSystemInfoRequest (requestPWS) and successfully receiving the message 4 (MSG4) with contention resolution. In an event that there is no SIB6 / SIB7 / SIB8 broadcast when the timer expires, the UE may retransmit the request message RRCSystemInfoRequest (requestPWS) , or the UE may be implicitly notified that the network has rejected the request for sending the requested warning message, since the network may not always be able to get the recent warning message and resend the SIBs. In an event that the UE has received the broadcast SIB6 / SIB7 / SIB8 before the timer expires, the UE may clear the timer.
[0050] FIG. 5 illustrates an example scenario 500 under schemes in accordance with implementations of the present disclosure. In scenario 500, a partial format of a DedicatedSIBRequest message with a new Information Element (IE) -requestPWS to request retransmission of the warning message is shown. The IE requestPWS may comprise information regarding at least one requested SIB (e.g., the requestSIB-List-r16 as depicted in FIG. 5) to request the SIB that indicates or carries the required warning message and an optional information regarding a UTC (e.g., the timeInfoUTC as depicted in FIG. 5) to request the SIBs since this UTC. The UTC may be set to the time when UE starts to receive the DCI with the etwsAndCmasIndication bit being set to ‘1’ , or to the time when UE starts RLF or OOS.
[0051] FIG. 6 illustrates an example scenario 600 under schemes in accordance with implementations of the present disclosure. In scenario 600, the UE in RRC_CONNECTED may transmit the request message DedicatedSIBRequest (requestPWS) to request retransmission of the warning message, and receive the requested warning message in the dedicated message, such as the RRCReconfiguration message or the SystemInformationDelivery message, to achieve dedicated system information delivery.
[0052] In some implementations, the UE may start a timer, such as the timer T350, after sending the request message DedicatedSIBRequest (requestPWS) . In an event that there is no dedicated SIB6 / SIB7 / SIB8 delivery when the timer expires, the UE may retransmit the request message DedicatedSIBRequest (requestPWS) , or the UE may be implicitly notified that the network has rejected the request for sending the requested warning message, since the network may not always be able to get the recent warning message and resend the warning message. In an event that the UE has received the dedicated SIB6 / SIB7 / SIB8 delivery before the timer expires, the UE may clear the timer.
[0053] With respect to the UE’s behavior in the first aspect of the present disclosure, the UE may receive an indication of a broadcast of a warning message from the network node, and then transmit a request message to the network node to request a retransmission of the warning message in an event that an incomplete reception of the warning message has been detected. The indication of the incoming broadcast of the warning message may be represented by the etwsAndCmasIndication bit being set to ‘1’ .
[0054] In some implementations, the UE may determine whether an OOS or an RLF has occurred after receiving the indication. In an event that the OOS or the RLF is determined to have occurred, the UE may perform a service recovery procedure to recover network connectivity and determine whether the incomplete reception of the warning message has occurred after recovering the network connectivity. The service recovery procedure may comprise an RRC re-establishment after the RLF and a cell reselection after the OOS.
[0055] In some implementations, the request message may comprise information regarding at least one requested SIB, and at least one segment of the warning message that has not been received by the UE may be indicated or carried in the requested SIB.
[0056] In some implementations, the request message may further comprise information regarding a UTC. The information regarding the UTC may indicate a time when the indication was received or a time when the OOS or the RLF of the UE occurred. The UE may request the BS to transmit (retransmit) the warning message or at least one segment of the warning message that has been transmitted after the UTC.
[0057] The UE may receive the requested SIB via broadcast system information as depicted in FIG. 4 or via a dedicated signaling as depicted in FIG. 6. In some implementations, the UE may perform a RACH procedure to request a radio resource for uplink transmission, and the request message may be transmitted in the RACH procedure as depicted in FIG. 4.
[0058] In some implementations, the incomplete reception of the warning message may comprise that at least one segment of the warning message is missing or has not been received, or may comprise that no more warning message is scheduled in the latest received SIB before the warning message or all segments of the warning message have been successfully received.
[0059] FIG. 7 illustrates an example scenario 700 under schemes in accordance with implementations of the present disclosure. In scenario 700, a method for detecting the incomplete reception of the warning message is shown. Assuming that the UE receives a DCI in which the etwsAndCmasIndication bit in the Short Message field is set to 1, and then enters either the RLF or OOS state before the warning message has been successfully received. When the network connectivity is restored or recovered, the UE receives the SIB1; however, since the scheduling information for ETWS / CMAS warning message (i.e., the scheduling details for SIB6 / SIB7 / SIB8) is absent from SIB1, the UE detects an incomplete reception of the warning message.
[0060] FIG. 8 illustrates an example scenario 800 under schemes in accordance with implementations of the present disclosure. In scenario 800, another method for detecting the incomplete reception of the warning message is shown. Assuming that the UE receives a DCI in which the etwsAndCmasIndication bit in the Short Message field is set to 1, and then enters either the RLF or OOS state before receiving all segments of the ETWS / CMAS warning message. For example, the UE may receive the SIB7 or SIB8 with the warningMessageSegmentType field set to notLastSegment before entering the RLF or OOS state. SIB6 is not shown in FIG. 8 because SIB6 is used to broadcast the PWS message with only one segment. When the network connectivity is restored or recovered, the UE receives the SIB1; however, since the scheduling information for ETWS / CMAS warning message (i.e., the scheduling details for SIB7 / SIB8) is absent from SIB1, the UE detects an incomplete reception of the warning message.
[0061] FIG. 9 illustrates an example scenario 900 under schemes in accordance with implementations of the present disclosure. In scenario 900, another method for detecting the incomplete reception of the warning message is shown. Assuming that the UE receives a DCI in which the etwsAndCmasIndication bit in the Short Message field is set to 1, and then enters either the RLF or OOS state before receiving all segments of the ETWS / CMAS warning message. When the network connectivity is restored or recovered, the UE receives some segments of the ETWS / CMAS warning message and then receives the SIB1 without the scheduling details for SIB6 / SIB7 / SIB8. However, since the UE did not receive all segments of the ETWS / CMAS warning message and the scheduling information for the warning message is absent from the latest received SIB1, the UE detects that one or more segments of the warning message are missed, and consequently determines that the reception of the warning message is incomplete.
[0062] With respect to the BS’s behavior in the first aspect of the present disclosure, the BS may transmit an indication of a broadcast of a warning message, and transmit the warning message in the network via broadcasting. The BS may receive a request message to request a retransmission of the warning message from a UE. In response to the request message, the BS may transmit the warning message or at least one segment of the warning message to the UE via a dedicated signaling or broadcast system information.
[0063] The request message may comprise information regarding at least one requested SIB, and the warning message or the segment of the warning message retransmitted by the BS may have been indicated in the requested SIB.
[0064] The request message may comprise information regarding a UTC. The information regarding the UTC may indicate a time when the indication was received by the UE or a time when an OOS or an RLF of the UE occurred. The BS may transmit (retransmit) the warning message or at least one segment of the warning message that has been transmitted after the UTC.
[0065] FIG. 10 illustrates an example process 1000 from the UE’s perspective with respect to reliable warning message reception in the first aspect of the present disclosure. The process 1000 may begin at block 1002.
[0066] The UE may receive a public warning indication, such as the indication etwsAndCmasIndication set to 1 at block 1002, and then detect an RLF or enter an OOS state at block 1004.
[0067] After the coverage recovery at block 1006, the UE may determine whether the network (NW) ends the warning message broadcast at block 1008. The UE may determine whether the network ends the warning message broadcast based on the latest received SIB. For example, the UE may be aware that the network ends the warning message broadcast when no more warning message is scheduled in the latest received SIB, and thus, no more warning messages will be broadcast by the network.
[0068] In an event that the network has not ended the warning message broadcast, the UE may keep waiting for the incoming broadcast of the warning message and then enter block 1008. In an event that the network has ended the warning message broadcast, the UE may further determine whether all segments of the warning message have been received at block 1010.
[0069] In an event that the UE has successfully received the warning message or has successfully received all segments of the warning message, the process may be ended. In an event that not all segments of the warning message have been received, the UE may send a request message to request retransmission of the warning message at block 1012, and receive the warning message via dedicated signaling or broadcast SIB at block 1014.
[0070] To accommodate UE in poor coverage in receiving the warning message broadcast, the BS may broadcast the repetition of the warning message per SIB modification period, and the repeated broadcast of the warning message may continue for multiple SIB modification periods to ensure reliable delivery.
[0071] Referring again to FIG. 1, the BS may repeatedly broadcast the warning message within the warning message broadcast time. For example, the BS may transmit the warning message for the first time during the initial transmission occasion, followed by up to seven repetitions within the broadcast period. For another example, the BS may transmit four segments of the warning message in the first four transmission occasions, and transmit the repeated copies of the four segments of the warning message in the subsequent four transmission occasions.
[0072] The UE may discard the duplicated message when it receives a repetition of the warning message. However, receiving duplicated warning messages leads to unnecessary power consumption.
[0073] In a second aspect of the present disclosure, methods and apparatus for repeated warning message indication are proposed to reduce the power consumption of the UE.
[0074] In the implementations in the second aspect of the present disclosure, the BS may send a control signaling to indicate that the first cycle of transmission of the warning message has completed and is now undergoing repeated transmission of the warning message. Upon receiving this indication, the UE may stop receiving the repetition of the warning message in an event that the same warning message has been successfully received.
[0075] In some implementations, the control signaling may comprise a new indication, such as an etwsAndCmasIndicationRepeat field, indicating whether the warning message is a repeated message. The control signaling may be transmitted via a short message or a DCI. For example, similar to the indication etwsAndCmasIndication, the new indication etwsAndCmasIndicationRepeat may be embedded as a bit within the DCI's Short Message field. In an event that the etwsAndCmasIndicationRepeat bit is set to ‘1’ , it is indicated that the first cycle of warning message transmission is ended and repeat transmission is started.
[0076] With respect to the UE’s behavior in the second aspect of the present disclosure, the UE may receive a control signaling from the BS. The control signaling may comprise a first indication bit, such as the etwsAndCmasIndication bit, indicating whether a warning message will be broadcast, and the control signaling may further comprise a second indication bit, such as the etwsAndCmasIndicationRepeat bit, indicating whether the warning message is a repeated message.
[0077] The UE may determine whether the warning message has been successfully received in an event that the first indication bit is set to indicate that the warning message will be broadcast and the second indication bit is set to indicate that the warning message is a repeated message. In an event that the warning message is transmitted using multiple message segments, whether the warning message has been successfully received may be determined based on whether all message segments of the warning message have been successfully received.
[0078] In an event that the warning message is determined to have been successfully received, the UE may determine not to receive the repeated message. In an event that the warning message is determined not to have been successfully received, the UE may determine to receive the repeated message.
[0079] In some implementations, the warning message may be broadcast via at least one SIB, such as SIB6, SIB7 or SIB8, and whether the warning message has been successfully received may be determined according to at least one of a message identifier field (e.g., the messageID or the messageIdentifier) and a serial number field (e.g., the serialNumber) of the SIB.
[0080] FIG. 11 illustrates an example scenario 1100 under schemes in accordance with implementations of the present disclosure. The UE receives a DCI in which the etwsAndCmasIndication bit in the Short Message field is set to 1, and then receives the warning message, such as the SIB6 / SIB7 / SIB8 that indicate or carry the ETWS or CMAS warning message. The network node (e.g., the BS or the gNB) may transmit the warning message more than one time before setting the etwsAndCmasIndicationRepeat bit.
[0081] The UE may receive another DCI in which the etwsAndCmasIndicationRepeat bit in the Short Message field is set to 1, and the UE may determine not to receive the warning message that is the repeated message in an event that the warning message has been successfully received. On the other hand, the UE may determine to receive the repeated message in an event that the warning message is not successfully received.
[0082] In a scenario where another new warning message arrives, the BS may transmit the control signaling via the short message or the DCI with the indication of repeated transmission of the warning message (such as the etwsAndCmasIndicationRepeat bit) being unset.
[0083] FIG. 12 illustrates an example scenario 1200 under schemes in accordance with implementations of the present disclosure. In scenario 1200, the UE may determine not to receive the warning message that is a repetition (e.g., as indicated by the etwsAndCmasIndicationRepeat bit in the Short Message field being set to 1) in an event that the warning message has been received successfully. When another new warning message arrives, the BS may unset the indication of repeated transmission of the warning message (for example, resetting the etwsAndCmasIndicationRepeat bit to 0) .
[0084] Upon receiving the DCI with the etwsAndCmasIndication bit being set to 1 and the etwsAndCmasIndicationRepeat bit being set to 0, the UE may determine to resume receiving the warning message.
[0085] Note that there is a possible scenario in which the BS concurrently broadcasts a previously delivered warning message along with a new warning message. In this case, the BS may refrain from sending the indication of repeated transmission of the warning message (e.g., by keeping the etwsAndCmasIndicationRepeat bit unset) until all new warning messages have been broadcast at least once.
[0086] FIG. 13 illustrates an example scenario 1300 under schemes in accordance with implementations of the present disclosure. In scenario 1300, the BS may keep the etwsAndCmasIndicationRepeat bit carried in the Short Message set to 0 (i.e., unset) until both the warning message with the MessageID=X and the warning message with the MessageID=Y have been broadcast at least once.
[0087] With respect to the BS’s behavior in the second aspect of the present disclosure, the BS may transmit a first control signaling in the network. The first control signaling may comprise a first indication bit indicating whether a warning message will be broadcast and a second indication bit indicating whether the warning message is a repeated message. The BS may transmit a first warning message via broadcasting in an event that the first indication bit in the first control signaling is set. The first warning message may be the repeated message in an event that the second indication bit in the first control signaling is set, and may not be the repeated message in an event that the second indication bit in the first control signaling is not set.
[0088] When a second warning message that is different from the first warning message arrives, the BS may transmit a second control signaling comprising the first indication bit being set and the second indication bit being unset, and transmit the second warning message via broadcasting.
[0089] The first control signaling and the second control signaling may be transmitted via a short message or the DCI.
[0090] FIG. 14 illustrates an example process 1400 from the UE’s perspective with respect to repeated warning message indication in the second aspect of the present disclosure. The process 1400 may begin at block 1402.
[0091] The UE may monitor and receive public warning indications, such as the indications etwsAndCmasIndication and etwsAndCmasIndicationRepeat carried via the short message or the DCI, at block 1402, and determine whether the indication etwsAndCmasIndication is set to 1 at block 1404. In an event that the determination result indicates no (e.g., etwsAndCmasIndication=0) , the UE may keep monitoring and receiving the public warning indications at block 1402.
[0092] In an event that the determination result indicates yes (e.g., etwsAndCmasIndication=1) , the UE may receive the warning message at block 1406 and determine whether the indication etwsAndCmasIndicationRepeat is set to 1 at block 1408. In an event that the determination result indicates no (e.g., etwsAndCmasIndicationRepeat=0) , the UE may keep receiving the warning message at block 1406.
[0093] In an event that the determination result indicates yes (e.g., etwsAndCmasIndicationRepeat=1) , the UE may determine whether the warning message has been successfully received at block 1410. In an event that the warning message has been successfully received, the UE may stop receiving the warning message at block 1412. In an event that the warning message has not been successfully received, the UE may keep receiving the warning message at block 1406. Illustrative Implementations
[0094] FIG. 15 illustrates an example communication system 1500 having an example communication apparatus 1510 and an example network apparatus 1520 in accordance with an implementation of the present disclosure. Each of the communication apparatus 1510 and the network apparatus 1520 may perform various functions to implement schemes, techniques, processes and methods described herein pertaining to reliable reception and indication of a warning message in mobile communications, including scenarios / schemes described above as well as the process 1600, the process 1700, the process 1800 and the process 1900 described below.
[0095] The communication apparatus 1510 may be a part of an electronic apparatus, which may be a UE such as a portable or mobile apparatus, a wearable apparatus, a wireless communication apparatus or a computing apparatus. For instance, the communication apparatus 1510 may be implemented in a smartphone, a smartwatch, a personal digital assistant, a digital camera, or a computing equipment such as a tablet computer, a laptop computer or a notebook computer. The communication apparatus 1510 may also be a part of a machine type apparatus, which may be an IoT, NB-IoT, or IIoT apparatus such as an immobile or a stationary apparatus, a home apparatus, a wire communication apparatus or a computing apparatus. For instance, the communication apparatus 1510 may be implemented in a smart thermostat, a smart fridge, a smart door lock, a wireless speaker or a home control center. Alternatively, the communication apparatus 1510 may be implemented in the form of one or more integrated-circuit (IC) chips such as, for example and without limitation, one or more single-core processors, one or more multi-core processors, one or more reduced-instruction set computing (RISC) processors, or one or more complex-instruction-set-computing (CISC) processors. The communication apparatus 1510 may include at least some of those components shown in FIG. 15 such as a processor 1512, for example. The communication apparatus 1510 may further include one or more other components not pertinent to the proposed scheme of the present disclosure (e.g., internal power supply, display device and / or user interface device) , and, thus, such component (s) of the communication apparatus 1510 are neither shown in FIG. 15 nor described below in the interest of simplicity and brevity.
[0096] The network apparatus 1520 may be a part of an electronic apparatus, which may be a network node such as a satellite, a BS, a small cell, a router, or a gateway of a 4G / 5G / B5G / 6G, NR, IoT, NB-IoT or IIoT network. Alternatively, the network apparatus 1520 may be implemented in the form of one or more IC chips such as, for example and without limitation, one or more single-core processors, one or more multi-core processors, or one or more RISC or CISC processors. The network apparatus 1520 may include at least some of those components shown in FIG. 15 such as a processor 1522, for example. The network apparatus 1520 may further include one or more other components not pertinent to the proposed scheme of the present disclosure (e.g., internal power supply, display device and / or user interface device) , and, thus, such component (s) of the network apparatus 1520 are neither shown in FIG. 15 nor described below in the interest of simplicity and brevity.
[0097] In one aspect, each of the processor 1512 and the processor 1522 may be implemented in the form of one or more single-core processors, one or more multi-core processors, or one or more CISC processors. That is, even though a singular term “a processor” is used herein to refer to the processor 1512 and the processor 1522, each of the processor 1512 and the processor 1522 may include multiple processors in some implementations and a single processor in other implementations in accordance with the present disclosure. In another aspect, each of the processor 1512 and the processor 1522 may be implemented in the form of hardware (and, optionally, firmware) with electronic components including, for example and without limitation, one or more transistors, one or more diodes, one or more capacitors, one or more resistors, one or more inductors, one or more memristors and / or one or more varactors that are configured and arranged to achieve specific purposes in accordance with the present disclosure. In other words, in at least some implementations, each of the processor 1512 and the processor 1522 is a special-purpose machine specifically designed, arranged and configured to perform specific tasks in accordance with various implementations of the present disclosure.
[0098] In some implementations, the communication apparatus 1510 may also include a transceiver 1516 coupled to the processor 1512 and capable of wirelessly transmitting and receiving data. In some implementations, the transceiver 1516 may be capable of wirelessly communicating with different types of UEs and / or wireless networks of different RATs. In some implementations, the transceiver 1516 may be equipped with a plurality of antenna ports (not shown) such as, for example, four antenna ports. That is, the transceiver 1516 may be equipped with multiple transmit antennas and multiple receive antennas for multiple-input multiple-output (MIMO) wireless communications. In some implementations, the network apparatus 1520 may also include a transceiver 1526 coupled to the processor 1522 and capable of wirelessly transmitting and receiving data. In some implementations, the transceiver 1526 may be capable of wirelessly communicating with different types of UEs of different RATs. In some implementations, the transceiver 1526 may be equipped with a plurality of antenna ports (not shown) such as, for example, four antenna ports. That is, transceiver 1526 may be equipped with multiple transmit antennas and multiple receive antennas for MIMO wireless communications.
[0099] In some implementations, the communication apparatus 1510 may further include a memory 1514 coupled to the processor 1512 and capable of being accessed by the processor 1512 and storing data therein. In some implementations, the network apparatus 1520 may further include a memory 1524 coupled to the processor 1522 and capable of being accessed by the processor 1522 and storing data therein. Each of the memory 1514 and the memory 1524 may include a type of random-access memory (RAM) such as dynamic RAM (DRAM) , static RAM (SRAM) , thyristor RAM (T-RAM) and / or zero-capacitor RAM (Z-RAM) . Alternatively, or additionally, each of the memory 1514 and the memory 1524 may include a type of read-only memory (ROM) such as mask ROM, programmable ROM (PROM) , erasable programmable ROM (EPROM) and / or electrically erasable programmable ROM (EEPROM) . Alternatively, or additionally, each of the memory 1514 and the memory 1524 may include a type of non-volatile random-access memory (NVRAM) such as flash memory, solid-state memory, ferroelectric RAM (FeRAM) , magnetoresistive RAM (MRAM) and / or phase-change memory.
[0100] Each of the communication apparatus 1510 and the network apparatus 1520 may be a communication entity capable of communicating with each other using various proposed schemes in accordance with the present disclosure. For illustrative purposes and without limitation, a description of capabilities of the communication apparatus 1510, as a UE, and the network apparatus 1520, as a network node, is provided below with the process 1600, the process 1700, the process 1800 and the process 1900. Illustrative Processes
[0101] FIG. 16 illustrates an example process 1600 in accordance with an implementation of the present disclosure. The process 1600 may be an example implementation of above scenarios / schemes, whether partially or completely, including those described above with respect to reliable warning message reception in mobile communications. The process 1600 may represent an aspect of the implementation of features of the communication apparatus 1510. The process 1600 may include one or more operations, actions, or functions as illustrated by one or more of the blocks 1610 and 1620. Although illustrated as discrete blocks, various blocks of the process 1600 may be divided into additional blocks, combined into fewer blocks, or eliminated, depending on the desired implementation. Moreover, the blocks of the process 1600 may be executed in the order shown in FIG. 16 or, alternatively, in a different order. The process 1600 may be implemented by the communication apparatus 1510. Solely for illustrative purposes and without limitation, the process 1600 is described below in the context of the communication apparatus 1510. The process 1600 may begin at block 1610.
[0102] At block 1610, the process 1600 may involve the processor 1512 of the communication apparatus 1510 receiving an indication of a broadcast of a warning message from the network apparatus 1520. The process 1600 may proceed from block 1610 to block 1620.
[0103] At block 1620, the process 1600 may involve the processor 1512 transmitting a request message to the network node to request a retransmission of the warning message in an event that an incomplete reception of the warning message has been detected.
[0104] In some implementations, the process 1600 may further involve the processor 1512 determining whether an OOS or an RLF has occurred after receiving the indication and determining whether the incomplete reception of the warning message has occurred after recovering network connectivity.
[0105] In some implementations, the incomplete reception of the warning message may comprise that no warning message is scheduled in a received system information block.
[0106] In some implementations, the incomplete reception of the warning message may comprise that at least one segment of the warning message has not been received.
[0107] In some implementations, the request message may comprise information regarding at least one requested SIB, and the segment of the warning message that has not been received may be indicated in the requested SIB.
[0108] In some implementations, the process 1600 may further involve the processor 1512 receiving the requested SIB via a dedicated signaling or broadcast system information.
[0109] In some implementations, the request message may further comprise information regarding a UTC, and the information regarding the UTC may indicate a time when the indication was received or a time when the OOS or the RLF occurred.
[0110] In some implementations, the process 1600 may further involve the processor 1512 performing a RACH procedure to request a radio resource for uplink transmission. The request message may be transmitted in the RACH procedure.
[0111] FIG. 17 illustrates an example process 1700 in accordance with an implementation of the present disclosure. The process 1700 may be an example implementation of above scenarios / schemes, whether partially or completely, including those described above with respect to reliable warning message reception for the UEs in mobile communications. The process 1700 may represent an aspect of the implementation of features of the network apparatus 1520. The process 1700 may include one or more operations, actions, or functions as illustrated by one or more of the blocks 1710, 1720 and 1730. Although illustrated as discrete blocks, various blocks of the process 1700 may be divided into additional blocks, combined into fewer blocks, or eliminated, depending on the desired implementation. Moreover, the blocks of the process 1700 may be executed in the order shown in FIG. 17 or, alternatively, in a different order. The process 1700 may be implemented by the network apparatus 1520 as well as any variations thereof. Solely for illustrative purposes and without limitation, the process 1700 is described below in the context of the network apparatus 1520. The process 1700 may begin at block 1710.
[0112] At block 1710, the process 1700 may involve the processor 1522 of the network apparatus 1520 transmitting a warning message via broadcasting. The process 1700 may proceed from block 1710 to block 1720.
[0113] At block 1720, the process 1700 may involve the processor 1522 receiving a request message to request a retransmission of the warning message from the communication apparatus 1510. The process 1700 may proceed from block 1720 to block 1730.
[0114] At block 1730, the process 1700 may involve the processor 1522 transmitting the warning message or at least one segment of the warning message to the apparatus via a dedicated signaling or broadcast system information.
[0115] In some implementations, the request message may comprise information regarding at least one requested SIB, and the warning message or the segment of the warning message may be indicated in the requested SIB.
[0116] In some implementations, the process 1700 may further involve the processor 1522 transmitting an indication of a broadcast of the warning message. The request message may further comprise information regarding a UTC, and the information regarding the UTC may indicate a time when the indication was received by the communication apparatus 1510 or a time when an OOS or an RLF of the communication apparatus 1510 occurred.
[0117] FIG. 18 illustrates an example process 1800 in accordance with an implementation of the present disclosure. The process 1800 may be an example implementation of above scenarios / schemes, whether partially or completely, including those described above with respect to repeated warning message indication in mobile communications. The process 1800 may represent an aspect of the implementation of features of the communication apparatus 1510. The process 1800 may include one or more operations, actions, or functions as illustrated by one or more of the blocks 1810, 1820 and 1830. Although illustrated as discrete blocks, various blocks of the process 1800 may be divided into additional blocks, combined into fewer blocks, or eliminated, depending on the desired implementation. Moreover, the blocks of the process 1800 may be executed in the order shown in FIG. 18 or, alternatively, in a different order. The process 1800 may be implemented by the communication apparatus 1510. Solely for illustrative purposes and without limitation, the process 1800 is described below in the context of the communication apparatus 1510. The process 1800 may begin at block 1810.
[0118] At block 1810, the process 1800 may involve the processor 1512 of the communication apparatus 1510 receiving a control signaling from the network apparatus 1520. The control signaling may comprise a first indication bit indicating whether a warning message will be broadcast and a second indication bit indicating whether the warning message is a repeated message. The process 1800 may proceed from block 1810 to block 1820.
[0119] At block 1820, the process 1800 may involve the processor 1512 determining whether the warning message has been successfully received in an event that the first indication bit is set to indicate that the warning message will be broadcast and the second indication bit is set to indicate that the warning message is the repeated message. The process 1800 may proceed from block 1820 to block 1830.
[0120] At block 1830, the process 1800 may involve the processor 1512 determining not to receive the repeated message in an event that the warning message is determined to have been successfully received.
[0121] In some implementations, the control signaling may be transmitted via a short message or a DCI.
[0122] In some implementations, the process 1800 may involve the processor 1512 receiving the repeated message in an event that the warning message is determined not to have been successfully received.
[0123] In some implementations, the process 1800 may involve the processor 1512 receiving the repeated message in an event that the first indication bit is set and the second indication bit is not set.
[0124] In some implementations, the warning message may be broadcast via at least one SIB, and whether the warning message has been successfully received may be determined according to at least one of a message identifier field and a serial number field of the SIB.
[0125] FIG. 19 illustrates an example process 1900 in accordance with an implementation of the present disclosure. The process 1900 may be an example implementation of above scenarios / schemes, whether partially or completely, including those described above with respect to repeated warning message indication in mobile communications. The process 1900 may represent an aspect of the implementation of features of the network apparatus 1520. The process 1900 may include one or more operations, actions, or functions as illustrated by one or more of the blocks 1910 and 1920. Although illustrated as discrete blocks, various blocks of the process 1900 may be divided into additional blocks, combined into fewer blocks, or eliminated, depending on the desired implementation. Moreover, the blocks of the process 1900 may be executed in the order shown in FIG. 19 or, alternatively, in a different order. The process 1900 may be implemented by the network apparatus 1520 as well as any variations thereof. Solely for illustrative purposes and without limitation, the process 1900 is described below in the context of the network apparatus 1520. The process 1900 may begin at block 1910.
[0126] At block 1910, the process 1900 may involve the processor 1522 of the network apparatus 1520 transmitting a first control signaling. The first control signaling may comprise a first indication bit indicating whether a warning message will be broadcast and a second indication bit indicating whether the warning message is a repeated message. The process 1900 may proceed from block 1910 to block 1920.
[0127] At block 1920, the process 1900 may involve the processor 1522 transmitting a first warning message via broadcasting in an event that the first indication bit in the first control signaling is set. The first warning message may be the repeated message in an event that the second indication bit in the first control signaling is set.
[0128] In some implementations, the first warning message may not be the repeated message in an event that the second indication bit in the first control signaling is not set.
[0129] In some implementations, the process 1900 may further involve the processor 1522 transmitting a second control signaling comprising the first indication bit being set and the second indication bit being unset and transmitting a second warning message via broadcasting. The second warning message may be different from the first warning message.
[0130] In some implementations, the first control signaling may be transmitted via a short message or a DCI. Additional Notes
[0131] The herein-described subject matter sometimes illustrates different components contained within, or connected with, different other components. It is to be understood that such depicted architectures are merely examples, and that in fact many other architectures can be implemented which achieve the same functionality. In a conceptual sense, any arrangement of components to achieve the same functionality is effectively "associated" such that the desired functionality is achieved. Hence, any two components herein combined to achieve a particular functionality can be seen as "associated with" each other such that the desired functionality is achieved, irrespective of architectures or intermedial components. Likewise, any two components so associated can also be viewed as being "operably connected" , or "operably coupled" , to each other to achieve the desired functionality, and any two components capable of being so associated can also be viewed as being "operably couplable" , to each other to achieve the desired functionality. Specific examples of operably couplable include but are not limited to physically mateable and / or physically interacting components and / or wirelessly interactable and / or wirelessly interacting components and / or logically interacting and / or logically interactable components.
[0132] Further, with respect to the use of substantially any plural and / or singular terms herein, those having skill in the art can translate from the plural to the singular and / or from the singular to the plural as is appropriate to the context and / or application. The various singular / plural permutations may be expressly set forth herein for sake of clarity.
[0133] Moreover, it will be understood by those skilled in the art that, in general, terms used herein, and especially in the appended claims, e.g., bodies of the appended claims, are generally intended as “open” terms, e.g., the term “including” should be interpreted as “including but not limited to, ” the term “having” should be interpreted as “having at least, ” the term “includes” should be interpreted as “includes but is not limited to, ” etc. It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases "at least one" and "one or more" to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles "a" or "an" limits any particular claim containing such introduced claim recitation to implementations containing only one such recitation, even when the same claim includes the introductory phrases "one or more" or "at least one" and indefinite articles such as "a" or "an, " e.g., “a” and / or “an” should be interpreted to mean “at least one” or “one or more; ” the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should be interpreted to mean at least the recited number, e.g., the bare recitation of "two recitations, " without other modifiers, means at least two recitations, or two or more recitations. Furthermore, in those instances where a convention analogous to “at least one of A, B, and C, etc. ” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention, e.g., “a system having at least one of A, B, and C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and / or A, B, and C together, etc. In those instances where a convention analogous to “at least one of A, B, or C, etc. ” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention, e.g., “a system having at least one of A, B, or C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and / or A, B, and C together, etc. It will be further understood by those within the art that virtually any disjunctive word and / or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B.”
[0134] From the foregoing, it will be appreciated that various implementations of the present disclosure have been described herein for purposes of illustration, and that various modifications may be made without departing from the scope and spirit of the present disclosure. Accordingly, the various implementations disclosed herein are not intended to be limiting, with the true scope and spirit being indicated by the following claims.
Claims
1.A method, comprising:receiving, by a processor of an apparatus, an indication of a broadcast of a warning message from a network node; andtransmitting, by the processor, a request message to the network node to request a retransmission of the warning message in an event that an incomplete reception of the warning message has been detected.2.The method of Claim 1, further comprising:determining, by the processor, whether an out of service (OOS) or a radio link failure (RLF) has occurred after receiving the indication; anddetermining, by the processor, whether the incomplete reception of the warning message has occurred after recovering network connectivity.3.The method of Claim 2, wherein the incomplete reception of the warning message comprises that no warning message is scheduled in a received system information block.4.The method of Claim 2, wherein the incomplete reception of the warning message comprises that at least one segment of the warning message has not been received.5.The method of Claim 4, wherein the request message comprises information regarding at least one requested system information block, and wherein the segment of the warning message that has not been received is indicated in the requested system information block.6.The method of Claim 5, further comprising:receiving, by the processor, the requested system information block via a dedicated signaling or broadcast system information.7.The method of Claim 5, wherein the request message further comprises information regarding a coordinated universal time (UTC) , and wherein the information regarding the UTC indicates a time when the indication was received or a time when the OOS or the RLF occurred.8.The method of Claim 1, further comprising:performing, by the processor, a random access channel (RACH) procedure to request a radio resource for uplink transmission,wherein the request message is transmitted in the RACH procedure.9.A method, comprising:transmitting, by a processor of a network node, a warning message via broadcasting;receiving, by the processor, a request message to request a retransmission of the warning message from an apparatus; andtransmitting, by the processor, the warning message or at least one segment of the warning message to the apparatus via a dedicated signaling or broadcast system information.10.The method of Claim 9, wherein the request message comprises information regarding at least one requested system information block, and wherein the warning message or the segment of the warning message is indicated in the requested system information block.11.The method of Claim 10, further comprising:transmitting, by the processor, an indication of a broadcast of the warning message,wherein the request message further comprises information regarding a coordinated universal time (UTC) , and wherein the information regarding the UTC indicates a time when the indication was received by the apparatus or a time when an out of service (OOS) or a radio link failure (RLF) of the apparatus occurred.12.A method, comprising:receiving, by a processor of an apparatus, a control signaling from a network node, wherein the control signaling comprises a first indication bit indicating whether a warning message will be broadcast and a second indication bit indicating whether the warning message is a repeated message;determining, by the processor, whether the warning message has been successfully received in an event that the first indication bit is set to indicate that the warning message will be broadcast and the second indication bit is set to indicate that the warning message is the repeated message; anddetermining, by the processor, not to receive the repeated message in an event that the warning message is determined to have been successfully received.13.The method of Claim 12, wherein the control signaling is transmitted via a short message or a downlink control information (DCI) .14.The method of Claim 12, further comprising:receiving, by the processor, the repeated message in an event that the warning message is determined not to have been successfully received.15.The method of Claim 12, further comprising:receiving, by the processor, the warning message in an event that the first indication bit is set and the second indication bit is not set.16.The method of Claim 12, wherein the warning message is broadcast via at least one system information block, and wherein whether the warning message has been successfully received is determined according to at least one of a message identifier field and a serial number field of the system information block.17.A method, comprising:transmitting, by a processor of a network node, a first control signaling, wherein the first control signaling comprises a first indication bit indicating whether a warning message will be broadcast and a second indication bit indicating whether the warning message is a repeated message; andtransmitting, by the processor, a first warning message via broadcasting in an event that the first indication bit in the first control signaling is set,wherein the first warning message is the repeated message in an event that the second indication bit in the first control signaling is set.18.The method of Claim 17, wherein the first warning message is not the repeated message in an event that the second indication bit in the first control signaling is not set.19.The method of Claim 17, further comprising:transmitting, by the processor, a second control signaling comprising the first indication bit being set and the second indication bit being unset; andtransmitting, by the processor, a second warning message via broadcasting, wherein the second warning message is different from the first warning message.20.The method of Claim 17, wherein the first control signaling is transmitted via a short message or a downlink control information (DCI) .
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