Paging occasion management method and apparatus for network energy saving (NES) cell in next generation mobile communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. According to the present disclosure, even when operating in a network energy saving (NES) mode, a base station may efficiently transmit an emergency signal to a terminal when an emergency occurs.

Description

Technical Field

[0001] The present disclosure relates to operations of a terminal and a base station in a wireless communication system, and particularly to a method and apparatus for transmitting and receiving an emergency signal between the terminal and the base station while operating in a network energy saving (NES) mode. Background Art

[0002] 5G mobile communication technology defines a wide frequency band, enabling high transmission rates and new services, and can be implemented not only in "sub-6 GHz" frequency bands such as 3.5 GHz, but also in "above 6 GHz" frequency bands, known as millimeter waves (mmWave), including 28 GHz and 39 GHz. Furthermore, consideration has been given to implementing 6G mobile communication technology (referred to as a "super 5G system") in terahertz (THz) frequency bands (e.g., the 95 GHz to 3 THz band) in order to achieve transmission rates fifty times faster than 5G mobile communication technology and ultra-low latency one-tenth that of 5G mobile communication technology.

[0003] At the start of the development of 5G mobile communication technology, in order to support services and meet performance requirements related to enhanced mobile broadband (eMBB), ultra-reliable low-latency communications (URLLC), and massive machine-type communications (mMTC), standardization is underway regarding beamforming and massive MIMO for mitigating radio wave path loss and increasing radio wave transmission range in mmWave, support for dynamic operation of parameter sets (e.g., operating multiple subcarrier spacings) and slot formats for efficient utilization of mmWave resources, initial access technology for supporting multi-beam transmission and wideband, definition and operation of BWP (bandwidth part), new channel coding methods such as LDPC (low-density parity-check) codes for large-volume data transmission and polar codes for highly reliable transmission of control information, L2 preprocessing, and network slicing for providing dedicated networks dedicated to specific services.

[0004] Currently, in view of the services to be supported by 5G mobile communication technology, there are ongoing discussions on improvements and performance enhancements to initial 5G mobile communication technology, and there has been physical layer standardization on various technologies such as: V2X (Vehicle-to-Everything) for assisting driving determination of autonomous vehicles based on information about the positioning and status of vehicles transmitted by vehicles and for enhancing user convenience, NR-U (New Radio Unlicensed) for system operation intended to comply with various regulatory requirements in unlicensed bands, NR UE power saving, non-terrestrial networks (NTNs) as UE-satellite direct communication for providing coverage in areas where communication with terrestrial networks is unavailable, and positioning.

[0005] In addition, standardization is ongoing for air interface architectures / protocols related to technologies such as the Industrial Internet of Things (IIoT), which supports new services through interworking and integration with other industries; IAB (Integrated Access and Backhaul), which provides nodes for expanding network service areas by integrating wireless backhaul and access links; mobility enhancements including conditional handover and DAPS (Dual Active Protocol Stack) handover; and two-step random access (NR's two-step RACH) for simplifying random access procedures. Standardization is also ongoing for the 5G baseline architecture (e.g., service-based architecture or service-based interface) for combining network function virtualization (NFV) and software-defined networking (SDN) technologies, as well as the system architecture / services for mobile edge computing (MEC) for receiving services based on UE positioning.

[0006] With the commercialization of 5G mobile communication systems, the already exponentially growing number of connected devices will be connected to the communication network, and accordingly, it is expected that enhanced functionality and performance of 5G mobile communication systems and the integrated operation of connected devices will become necessary. To this end, new research is planned related to: extended reality (XR) for effectively supporting AR (augmented reality), VR (virtual reality), MR (mixed reality), etc.; 5G performance improvement and complexity reduction through the use of artificial intelligence (AI) and machine learning (ML); AI service support; metaverse service support; and drone communication.

[0007] Furthermore, such development of 5G mobile communication systems will serve as the foundation for developing not only new waveforms for providing coverage of the terahertz band for 6G mobile communication technology, multi-antenna transmission technologies such as full-dimensional MIMO (FD-MIMO), array antennas, and massive antennas, metamaterial-based lenses and antennas for improving coverage of terahertz band signals, high-dimensional spatial multiplexing technologies utilizing OAM (orbital angular momentum), and RIS (Reconfigurable Smart Surfaces), but also full-duplex technologies for improving the frequency efficiency of 6G mobile communication technology and improving system networks, AI-based communication technologies for achieving system optimization by leveraging satellites and AI (artificial intelligence) from the design stage and internalizing end-to-end AI support functions, and next-generation distributed computing technologies for enabling services at a level of complexity that exceeds the limits of UE operating capabilities by utilizing ultra-high-performance communication and computing resources.

[0008] Meanwhile, even in the case of operating in a network energy saving (NES) mode, a need arises for a method for a base station to transmit an emergency signal to a terminal when an emergency event occurs. Summary of the Invention

[0009] Technical issues

[0010] An object of the present disclosure is to provide a method and apparatus for efficiently transmitting an emergency signal from a base station to a terminal when an emergency occurs even when operating in a network energy saving (NES) mode.

[0011] Solution to the problem

[0012] Therefore, embodiments herein provide a method performed by a base station in a wireless network. The method includes: sending a message including configuration information for sending an emergency signal associated with a network energy saving (NES) mode to a terminal; when a cell is operating in the NES mode, determining whether a predetermined emergency event is detected during an NES active period; and sending the emergency signal to the terminal based on determining that the predetermined emergency event is detected.

[0013] Therefore, embodiments herein provide a base station in a wireless network. The base station includes a transceiver; and at least one processor operably coupled to the transceiver, the at least one processor being configured to: send, via the transceiver, a message including configuration information for sending an emergency signal associated with a network energy saving (NES) mode to a terminal; when a cell is operating in the NES mode, determine whether a predetermined emergency event is detected during an NES active period; and, based on determining that the predetermined emergency event is detected, send, via the transceiver, the emergency signal to the terminal.

[0014] Advantageous Effects of the Invention

[0015] According to an embodiment of the present disclosure, even in the case of operating in a network energy saving (NES) mode, when an emergency event occurs, a base station can effectively transmit an emergency signal to a terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] For a more complete understanding of the present disclosure and its advantages, reference is now made to the following description taken in conjunction with the accompanying drawings, wherein like reference numerals represent like parts:

[0017] Figure 1 1 shows the structure of an NR system according to an embodiment of the present disclosure;

[0018] Figure 2 shows the NES mode or cell DTX / cell DRX of a base station or a cell according to an embodiment of the present disclosure;

[0019] Figure 3 An operation is shown in a case where an NES mode or cell DTX / cell DRX of a base station or a cell overlaps with a paging signal reception portion (paging occasion, hereinafter referred to as PO) of a UE in an idle mode according to an embodiment of the present disclosure;

[0020] Figure 4A method for transmitting an emergency signal in an NES cell according to an embodiment of the present disclosure is shown;

[0021] Figure 5 The operation of a terminal and a base station according to an embodiment of the present disclosure is shown;

[0022] Figure 6 A method for transmitting an emergency signal in an NES cell according to another embodiment of the present disclosure is shown;

[0023] Figure 7 A method for transmitting an emergency signal in an NES cell according to another embodiment of the present disclosure is shown;

[0024] Figure 8 A method for transmitting an emergency signal in an NES cell according to another embodiment of the present disclosure is shown;

[0025] Figure 9 A method for transmitting an emergency signal in an NES cell according to another embodiment of the present disclosure is shown;

[0026] Figure 10 shows the structure of a base station according to an embodiment of the present disclosure; and

[0027] Figure 11 The structure of a terminal according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0028] Discussed below Figures 1 to 11 The various embodiments used to describe the principles of the present disclosure in this patent document are illustrative only and should not be interpreted in any way as limiting the scope of the present disclosure. Those skilled in the art will understand that the principles of the present disclosure can be implemented in any suitably arranged system or device.

[0029] Hereinafter, the operating principles of the present disclosure will be described in detail with reference to the accompanying drawings. When describing the present disclosure, detailed descriptions of related known functions or configurations will be omitted if it is deemed that this would unnecessarily obscure the main purpose of the present disclosure. Furthermore, the terms described below have been defined with consideration of their functions in the present disclosure and may vary depending on the intention or practice of the user or operator. Therefore, each term should be defined based on the context of the entire specification.

[0030] In the following description, for the sake of convenience, terms used to identify access nodes, terms used to represent network entities, terms used to represent messages, terms used to represent interfaces between network entities, and terms used to represent various types of identity information are shown. Therefore, the present disclosure is not limited to the following terms, and other terms representing objects with equivalent technical meanings may be used.

[0031] In the following description, a base station is an entity that performs resource allocation for a terminal and can be at least one of a gNode B, an eNode B, a Node B, a base station (BS), a wireless access unit, a base station controller, and a network node. A terminal can include a user equipment (UE), a mobile station (MS), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing communication functions. In this disclosure, a downlink (DL) is a wireless transmission path through which a BS transmits signals to a terminal, and an uplink (UL) is a wireless transmission path through which a terminal transmits signals to a BS. Furthermore, the embodiments of this disclosure are discussed as examples of LTE or LTE-A systems. However, the embodiments of this disclosure can be applied to other communication systems with similar technical backgrounds or channel types. For example, the fifth generation mobile communication technology (5G, New Radio, NR) developed since LTE-A can be included in systems to which the embodiments of this disclosure can be applied. As used herein, 5G can also be a concept that includes existing LTE, LTE-A, and other similar services. Furthermore, as determined by those skilled in the art, the embodiments of this disclosure can be applied to other communication systems with some modifications that do not significantly depart from the scope of this disclosure. Here, it will be understood that each block of the flowchart illustrations, and combinations of blocks, can be executed by computer program instructions.

[0032] The computer program instructions may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that the instructions executed by the processor of the computer or other programmable data processing device create components for implementing the functions specified in the blocks of the flowchart. The computer program instructions may also be stored in a computer-usable or computer-readable memory, which may instruct the computer or other programmable data processing device to function in a specific manner, such that the instructions stored in the computer-usable or computer-readable memory may produce an article of manufacture comprising instruction components that implement the functions specified in the blocks of the flowchart. The computer program instructions may also be loaded onto a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, such that executing the instructions of the computer or other programmable data processing device provides steps for implementing the functions specified in the blocks of the flowchart.

[0033] Furthermore, each block may represent a module, segment, or portion of code, comprising one or more executable instructions for implementing the specified logical functionality. Furthermore, it should be noted that in some alternative implementations, the functions specified within the blocks may occur out of sequence. For example, two blocks shown in succession may actually be executed simultaneously or approximately simultaneously, or the blocks may sometimes be executed in the reverse order, depending on the functionality involved. As used herein, the term "unit" refers to a software element or hardware element, such as a field-programmable gate array (FPGA) or an application-specific integrated circuit (ASIC), that performs a predetermined function. However, the term "unit" is not always limited to software or hardware. A "unit" may be configured to be stored in an addressable storage medium or executed by one or more processors. Thus, a "unit" includes, for example, elements, such as software elements, object-oriented software elements, class elements, and task elements, processes, functions, properties, procedures, subroutines, program code segments, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and parameters. The functionality provided within elements and "units" may be combined into a smaller number of elements and "units" or further divided into additional elements and "units." Furthermore, the elements and "units" may be implemented as one or more CPUs within a reproduction device or a secure multimedia card. Furthermore, in an embodiment, a "unit" may include at least one processor.

[0034] For ease of description, this disclosure uses terms and names defined in the 5GS and NR standards, which are existing telecommunications standards defined by the Third Generation Partnership Project (3GPP). However, this disclosure is not limited by these terms and names and can be equally applied to wireless communication networks that conform to other standards. For example, this disclosure can be applied to 3GPP 5GS / NR (fifth-generation mobile communication standards).

[0035] Figure 1 The structure of the NR system according to an embodiment of the present disclosure is shown.

[0036] refer to Figure 1 As shown in the figure, the radio access network of the NR system may include a next-generation base station (g NodeB, hereinafter referred to as gNB, NodeB or base station) 110 and a core network (CN) 120. A user terminal (terminal or user equipment, hereinafter referred to as UE) 100 or terminal can access external networks through the gNB and CN.

[0037] exist Figure 1In the NR system, gNB 110 corresponds to the existing Node B in the UMTS system or the existing enhanced Node B (ENB) in the LTE system. The gNB connects to the UE via a radio channel and can perform more complex functions than an existing ENB. In the NR system, because all user services, including real-time services such as Voice over IP (VoIP) over Internet Protocol, are served via shared channels, a mechanism may be required to collect and schedule status information such as the UE's buffer status, available transmission power, and channel status. This information can be managed by the gNB 110. The gNB 110 can typically control multiple cells. For example, to achieve a transmission rate of 100 Mbps, the NR system can use orthogonal frequency division multiplexing (OFDM) as the radio access technology within a 20 MHz bandwidth. In addition, an adaptive modulation and coding (AMC) scheme can be applied to determine the modulation scheme and channel coding rate based on the terminal's channel conditions.

[0038] The NR CN 120 can perform functions such as mobility support, bearer configuration, and QoS configuration. The CN 120 can be a device for managing various control functions and mobility management functions of the UE 100, and can be connected to multiple base stations 110. In addition, the next-generation mobile communication system can also be linked with the existing LTE system, and the CN can be connected to the MME through a network interface. The MME can be connected to the eNB, which is an existing base station.

[0039] Figure 2 The concept of NES mode of a base station or a cell or cell discontinuous transmission (DTX) / cell discontinuous reception (DRX) according to an embodiment of the present disclosure is shown.

[0040] To save power consumption in network equipment, a Network Energy Saving (NES) cell 2-01 supporting cell DTX / DRX may transmit and / or receive signals only during specific time periods. For example, the NES cell 2-01 may transmit signals (2-45) during the cell DTX / DRX active periods (2-15, 2-25, 2-35) and receive signals (2-50) from the NES UE 2-02. According to an embodiment, the NES cell 2-01 may neither transmit signals nor receive signals from the UE during the cell DTX / DRX inactive periods (2-10, 2-20, 2-30, 2-40). The NES cell 2-01 may broadcast an indication indicating support for the cell DTX / DRX function using / based on system information (e.g., MIB or SIB1). The NES cell 2-01 may activate cell DTX / DRX according to a specific pattern, and information about the specific pattern may be broadcast in the system information. For example, the NES cell 2-01 may broadcast in system information the periodicity of the cell DTX / DRX active period, a starting time slot / offset indicating a starting point, the cell DTX / DRX active period (on duration), etc. Therefore, the NES UE 2-02 may synchronize with the NES cell 2-01, measure the NES cell, camp on the NES cell, or reselect the NES cell.

[0041] According to an embodiment of the present disclosure, the NES terminal 2-02 provides for measuring surrounding cells before a cell DTX / DRX inactive period, even if the serving cell satisfies the following: Srxlev>SIntraSearchP and Squal>SIntraSearchQ or Srxlev>SnonIntraSearchP and Squal>SnonIntraSearchQ. When the NES cell 2-01 enters a cell DRX / DRX inactive period, the NES UE 2-02 may no longer transmit or receive signals from the corresponding cell, so the corresponding cell measures surrounding cells before the cell DTX / DRX inactive period, thereby allowing cell reselection.

[0042] For reference, in the case of a general UE 2-03, the NES cell 2-01 may be barred. For example, the general UE 2-03 may be barred so as not to (re)select the NES cell 2-01 based on information stored in the MIB broadcasted by the NES cell 2-01.

[0043] Figure 3 The operation according to an embodiment of the present disclosure is shown in the case where the NES mode or discontinuous transmission (DTX) / discontinuous reception (DRX) of a base station or a cell overlaps with the paging signal reception part (paging occasion, hereinafter referred to as PO) of a UE in idle mode.

[0044] In this figure, NES UE a 300 and NES UE b 310 have periodically repeated POs. In the case where the base station turns on the cell NES mode, the PO may overlap with the cell NES active period (320). During this overlap, the base station operates in NES mode and may not send paging signals. Therefore, during the overlap time, UEs 300 and 310 may not receive paging signals even though they observe (or monitor) the PO. In this case, as Figure 3 As shown, in an embodiment of the present disclosure, when the base station operates in NES mode, if an emergency event occurs that requires sending an emergency signal, the corresponding signal cannot be sent to the UE until the base station deactivates the NES mode. Therefore, there is a problem that there may be a long delay until the UE receives the emergency signal.

[0045] at the same time, Figure 4 is a diagram illustrating a method for waking up an NES cell for transmitting an emergency signal according to an embodiment of the present disclosure. Figure 4 Even if the base station 405 is operating in the NES mode, the UE 400 may not stop monitoring the PO to receive emergency messages. In this case, the UE 400 may monitor the emergency signal transmitted by the base station 405 in the PO selected as a result of calculation by a certain formula based on the default DRX cycle preconfigured by the base station 405. The formula is selected by the UE 400 or preconfigured by the UE 400 and the base station 405 within a default DRX cycle. In this case, the base station 405 may also know information about the default DRX cycle.

[0046] As described above, when the cell NES mode is on, the PO and the cell NES active period (410) may overlap. During this overlap, the base station 405 operates in NES mode and may not transmit paging signals. In this case, during the overlap time, even if the UE observes the PO, the UE 400 may not receive a paging signal. However, the UE 400 may monitor the PO for emergency situations during the cell NES active period (410).

[0047] According to an embodiment of the present disclosure, Figure 4In the embodiment of the present invention, even when the base station 405 is operating in the NES mode, when an emergency event occurs (430) and it is necessary to send an emergency signal to the UE, the base station 405 can recognize this. For example, even when operating in the NES mode, the base station 405 can receive corresponding information (e.g., information associated with the occurrence of the emergency event) from the core network and can not shut down the communication module connected to the core network in order to receive the above-mentioned corresponding information. When the base station 405 recognizes that an emergency event has occurred and it is necessary to send an emergency signal to the UE when operating in the NES mode, the base station 405 wakes up during the immediately following default DRX cycle and sends the corresponding emergency signal 420 to the UE. Obviously, the emergency signal 420 can be sent to the UE in the form of short data included in the paging signal, or can be sent as a separate signal after the paging signal. The emergency signal 420 can be any signal including emergency information. In this way, when the base station 405 needs to send an emergency signal to the UE, the base station immediately wakes up and sends the emergency signal to the UE, thereby enabling the UE to receive the emergency signal without delay.

[0048] The base station 405 may configure the DRX cycle as a certain default DRX cycle, and the corresponding DRX cycle may be configured in a form in which the DRX cycle is a period in which the UE 400 receives a paging occasion to receive an emergency signal even after the base station 405 enters the NES mode.

[0049] The default DRX cycle may be a new type of DRX cycle that is directly configured to have a certain period value (eg, 20 ms) from a certain reference point (eg, SFN0 or SFN where the NES mode starts).

[0050] The default DRX cycle may be configured with an existing DRX cycle indication and a multiple to have a certain multiple of the existing DRX cycle.

[0051] The default DRX cycle may be configured and operated so that the UE attempts reception only in a portion of a certain existing DRX cycle. For example, the default DRX cycle may be configured and operated so that the UE performs reception in a DRX cycle that is counted from a DRX cycle starting at SFN0, or a DRX cycle that is counted from the start of the NES mode and multiplied by an even number, an odd number, or a certain constant configured by the base station. For example, if the base station configures 3, then reception is performed in multiples of 3 in the DRX cycle.

[0052] In an embodiment, the base station 405 may send an emergency signal to the UE 400 and then return to NES mode to save power.

[0053] In another embodiment, the base station 405 may wake up after sending an emergency signal to the UE 400 and operate in NES inactive mode.

[0054] Figure 5 The operations of the terminal and the base station according to the embodiment of the present disclosure are shown.

[0055] In operation S530, when base station 510 is operating in NES mode, base station 510 may pre-configure UE 500, which supports emergency signal reception, regarding which paging occasions can be used to receive emergency signals. The corresponding configuration message may be sent by being included in any signal (such as an RRC message, MAC message, or SIB message) transmitted from base station 510 to UE 500. Base station 510 may configure the DRX cycle to a certain default DRX cycle, and the corresponding DRX cycle may be configured in the following manner: the DRX cycle is a period in which UE 500 receives paging occasions to receive emergency signals even after base station 510 enters NES mode.

[0056] The default DRX cycle may be a new type of DRX cycle that is directly configured to have a certain period value (eg, 20 ms) from a certain reference point (eg, SFN0 or SFN where the NES mode starts).

[0057] The default DRX cycle may be configured with an existing DRX cycle indication and a multiple to have a certain multiple of the existing DRX cycle.

[0058] The default DRX cycle may be configured and operated so that the UE attempts reception only in a portion of a certain existing DRX cycle. For example, the default DRX cycle may be configured and operated so that the UE performs reception in a DRX cycle that is counted from a DRX cycle starting at SFN0, or a DRX cycle that is counted from the start of the NES mode and multiplied by an even number, an odd number, or a certain constant configured by the base station. For example, if the base station configures 3, then reception is performed in multiples of 3 in the DRX cycle.

[0059] In operation S540, the base station 510 may operate in the NES mode. In addition, in operation S545, the UE 500 may recognize the start of the NES mode operation.

[0060] UE 500 can monitor the emergency signal sent by base station 510 in a PO selected as a result of calculation by a certain formula based on the default DRX cycle preconfigured by base station 510, which is selected by UE 500 or preconfigured by UE 500 and base station 510 within a default DRX cycle.

[0061] If an emergency occurs while operating in NES mode, base station 510 may receive an emergency signal from core network 520 (operation S550). In operation S560, base station 510 may recognize the need to transmit the emergency signal to UE 500 and wake up. Furthermore, base station 510 may prepare to transmit the emergency signal during the next DRX cycle. In operation S570, UE 500 may perform periodic paging reception for the emergency signal during the next default DRX cycle. Furthermore, in operation S580, base station 510 may transmit a page containing emergency information to UE 500.

[0062] For example, base station 510 wakes up to send an emergency signal and can then send the corresponding emergency signal to UE 500 during the default DRX cycle. Obviously, the emergency signal can be sent to the UE in the form of short data included in the paging signal, or can be sent as a separate signal after the paging signal. Emergency signal 420 can be any signal that includes emergency information. In this way, when base station 510 needs to send an emergency signal to the UE, the base station immediately wakes up and sends the emergency signal to UE 500, allowing UE 500 to receive the emergency signal without delay.

[0063] In an embodiment, the base station 510 may send an emergency signal to the UE 500 and then return to the NES mode to save power.

[0064] In another embodiment, the base station 510 may wake up after sending an emergency signal to the UE 500 and operate in the NES inactive mode.

[0065] at the same time, Figure 6 FIG. 1 is a diagram illustrating a method for transmitting an emergency signal in an NES cell according to another embodiment of the present disclosure. Figure 6 In the embodiment of the present invention, even in the case where the base station 600 is operating in the NES mode, the base station 600 can recognize when an emergency event occurs and it is necessary to send an emergency signal to the UE 610. For example, even when operating in the NES mode, the base station 600 is able to receive information about the occurrence of the emergency signal from the core network, and for this purpose, the communication module connected to the core network may not be turned off. If an emergency event occurs (620) while operating in the NES mode, and the base station 600 recognizes that it is necessary to send an emergency signal to the UE 610, the base station may start sending the emergency signal 640 as soon as the UE wakes up (630). The emergency signal 640 may be continuously sent even during the default DRX cycle that arrives after the start of transmission. According to Figure 6 In the embodiment shown, the base station 600 is capable of Figure 4The illustrated embodiment transmits the corresponding emergency signal to the UE more quickly. Obviously, the emergency signal 640 can be sent to the UE 610 in the form of short data included in the paging signal, or can be sent as a separate signal after the paging signal. The emergency signal 640 can be any signal that includes emergency information. In this way, when it is necessary to send an emergency signal to the UE 610, the base station 600 immediately wakes up and transmits the emergency signal, allowing the UE 610 to receive the emergency signal without delay.

[0066] In an embodiment, the base station 600 may send an emergency signal to the UE 610 and then return to the NES mode to save power.

[0067] In another embodiment, the base station 600 may wake up after sending an emergency signal to the UE 610 and operate in the NES inactive mode.

[0068] Figure 7 FIG. 4 shows a method for sending an emergency signal in an NES cell according to another embodiment of the present disclosure. Figure 7 In the embodiment of the present invention, even when the base station 700 is operating in the NES mode, the base station 700 can recognize when an emergency event occurs and it is necessary to transmit an emergency signal to the UE 710. For example, even when operating in the NES mode, the base station 700 is able to receive information about the occurrence of the emergency signal from the core network, and for this purpose, the communication module connected to the core network may not be turned off. If an emergency event occurs (720) while operating in the NES mode, and the base station 700 recognizes that it is necessary to transmit the emergency signal to the UE 710, the base station may start transmitting the emergency signal 740 once the UE wakes up (730). In addition, the base station 700 transmits the emergency signal during the DRX cycle.

[0069] exist Figure 7 In the embodiment shown, the base station 700 may not need to send the emergency signal in the default DRX cycle (eg, without waiting). Figure 4 The embodiment shown sends the corresponding emergency signal to the UE more quickly and is Figure 6 Compared to the embodiment shown in FIG. 7 , the base station can save power by avoiding unnecessary retransmissions. Obviously, the emergency signal 740 can be sent to the UE in the form of short data included in the paging signal, or can be sent as a separate signal after the paging signal. The emergency signal 740 can be any signal that includes emergency information. In this way, when it is necessary to send an emergency signal to the UE 710, the base station 700 immediately wakes up and sends the emergency signal, thereby enabling the UE 710 to receive the emergency signal without delay.

[0070] In an embodiment, the base station 700 may send an emergency signal to the UE 710 and then return to the NES mode to save power.

[0071] In another embodiment, the base station 700 may wake up after sending an emergency signal to the UE 710 and operate in the NES inactive mode.

[0072] at the same time, Figure 8 FIG. 4 shows a method for sending an emergency signal in an NES cell according to another embodiment of the present disclosure. Figure 8 In the embodiment of the present invention, even in the case where the base station 800 operates in the NES mode, the base station 800 can recognize when an emergency event occurs and it is necessary to transmit an emergency signal to the UE 810. For example, even when operating in the NES mode, the base station 800 can receive information about the occurrence of the emergency signal from the core network, and for this purpose, the communication module connected to the core network may not be turned off.

[0073] according to Figure 8 In the illustrated embodiment, base station 800 generates a new periodic DRX cycle from the start of NES mode operation, for example, operating with a shifted default DRX cycle. UE 810 can also identify the time of base station 800's NES mode operation, identify the shifted default DRX cycle, and operate using / following / based on the shifted DRX cycle. When base station 800 identifies the occurrence of an emergency and the need to transmit an emergency signal to UE 810 while operating in NES mode, the base station begins transmitting emergency signal 830 as soon as the UE wakes up, and base station 800 can transmit emergency signal 830 during the shifted default DRX cycle (840). Obviously, emergency signal 830 can be transmitted to UE 810 in the form of short data included in a paging signal, or can be transmitted as a separate signal following the paging signal. Emergency signal 830 can be any signal that includes emergency information. In this way, when base station 800 needs to transmit an emergency signal to UE 810, the base station immediately wakes up and transmits the emergency signal, allowing UE 810 to receive the emergency signal without delay.

[0074] In an embodiment, the base station 800 may send an emergency signal to the UE 810 and then return to the NES mode to save power.

[0075] In another embodiment, the base station 800 may wake up after sending an emergency signal to the UE 810 and operate in the NES inactive mode.

[0076] at the same time, Figure 9 FIG. 4 shows a method for sending an emergency signal in an NES cell according to another embodiment of the present disclosure. Figure 9In the case where the base station 900 operates in the NES mode, the base station 900 may configure the UE 910 supporting emergency signal reception to include a paging early indication (hereinafter, PEI) and transmit emergency signal information. The corresponding configuration message may be transmitted by being included in any signal (such as an RRC message, a MAC message, or a SIB message) transmitted from the base station 900 to the UE 910.

[0077] The PEI may include some or all of the following information.

[0078] The PEI may indicate to the UE that the corresponding PEI is only used for emergency indication.

[0079] The PEI may include emergency information.

[0080] The PEI may include an indication indicating the presence of emergency information.

[0081] The PEI may provide an emergency indication to the UE.

[0082] The PEI may indicate to the UE a certain / random DRX cycle in which it is scheduled to send a paging occasion for receiving an emergency indication.

[0083] The PEI may indicate to the UE a certain / random DRX cycle in which it is scheduled to send SSB reception resources for emergency indication reception and paging occasions.

[0084] The base station 900 may configure the UE 910 with a certain / random default DRX cycle, so that the UE 910 receives a paging early indication for emergency signals even after the base station 900 enters NES mode. The base station may send an indication to the UE, informing the UE that PEI may be sent in the default DRX cycle, by including the indication in an RRC message, MAC message, or PHY message. The corresponding DRX cycle may be configured in the following manner.

[0085] The default DRX cycle may be a new type of DRX cycle that is directly configured to have a certain period value (eg, 20 ms) from a certain reference point (eg, SFN0 or SFN where the NES mode starts).

[0086] The default DRX cycle may be configured with an existing DRX cycle indication and a multiple to have a certain multiple of the existing DRX cycle.

[0087] The default DRX cycle may be configured and operated so that the UE attempts reception only in a portion of a certain existing DRX cycle. For example, the default DRX cycle may be configured and operated so that the UE performs reception in a DRX cycle that is counted from a DRX cycle starting at SFN0, or a DRX cycle that is counted from the start of the NES mode and multiplied by an even number, an odd number, or a certain constant configured by the base station. For example, if the base station configures 3, then reception is performed in multiples of 3 in the DRX cycle.

[0088] Even when base station 900 is operating in NES mode, base station 900 can recognize when an emergency event has occurred and it is necessary to transmit an emergency signal to UE 910. For example, even when operating in NES mode, base station 900 can receive information about the occurrence of an emergency signal from the core network, and for this purpose, the communication module connected to the core network may not be turned off. When base station 900 recognizes that an emergency event has occurred while operating in NES mode (920) and it is necessary to transmit an emergency signal to UE 910, base station 900 can wake up during the immediately following default DRX cycle and transmit a corresponding emergency signal to UE 910 (930). For example, base station 900 can transmit a PEI including emergency information to UE 910. Obviously, emergency signal 940 can be transmitted to UE 910 in the form of short data included in a paging signal following the PEI or the PEI, or as a separate signal following the paging signal. In this way, when it is necessary to transmit an emergency signal to UE 910, base station 900 can immediately wake up and transmit the emergency signal, thereby enabling UE 910 to receive the emergency signal without delay.

[0089] The base station may configure the UE with a DRX cycle as a certain default DRX cycle, which is a period for receiving a paging occasion to receive an emergency signal even after the base station enters the NES mode, and the corresponding DRX cycle may be configured in the following form.

[0090] The default DRX cycle may be a new type of DRX cycle that is directly configured to have a certain period value (eg, 20 ms) from a certain reference point (eg, SFN0 or SFN where the NES mode starts).

[0091] The default DRX cycle may be configured with an existing DRX cycle indication and a multiple to have a certain multiple of the existing DRX cycle.

[0092] The default DRX cycle may be configured and operated so that the UE attempts reception only in a portion of a certain existing DRX cycle. For example, the default DRX cycle may be configured and operated so that the UE performs reception in a DRX cycle that is counted from a DRX cycle starting at SFN0, or a DRX cycle that is counted from the start of the NES mode and multiplied by an even number, an odd number, or a certain constant configured by the base station. For example, if the base station configures 3, then reception is performed in multiples of 3 in the DRX cycle.

[0093] Referring to the drawings, the base station 900 may configure and use the DRX cycle for the UE 910 in various ways. For example, once the UE wakes up, the base station 900 may start transmitting the PEI and continue transmitting the PEI until the end of the immediately following configured DRX cycle, and once the UE wakes up, the base station 900 may start transmitting the PEI and continue transmitting the PEI only for the length of the DRX cycle.

[0094] In an embodiment, the base station 900 may send an emergency signal to the UE 910 and then return to the NES mode to save power.

[0095] In another embodiment, the base station 900 may wake up after sending an emergency signal to the UE 910 and operate in the NES inactive mode.

[0096] Obviously, the UE described in the present disclosure can choose whether to use or not to receive emergency signals depending on the selection of the UE or the user. Obviously, in the case where the UE uses emergency signal reception by selecting the UE or the user, the UE can include emergency signal reception in the UE's capability information or capability information, and when the base station requests the capability information, provide the capability information to the base station.

[0097] According to an embodiment of the present disclosure, a method for a terminal to trigger an event for saving specific power may include: performing a communication connection with a first base station, receiving from the first base station information including the location of neighboring base stations of the first base station and a threshold value based on the location, and the terminal performing a specific event based on the information, for example, an event for determining whether the terminal is at the center of a cell, for example, an event for determining that the mobility of the terminal is at or below a specific level, etc., and performing a specific power saving mechanism, for example, relaxing the measurement period of a reference signal or stopping the measurement of a reference signal when the conditions of the specific event are met.

[0098] Figure 10 The structure of a base station according to an embodiment of the present disclosure is shown.

[0099] refer to Figure 10, the base station may include a transceiver 1010, a controller 1020, and a storage device 1030. The transceiver 1010, the controller 1020, and the storage device 1030 may operate according to the above-mentioned base station communication method. In addition, the network device may also correspond to the structure of the base station. However, the components of the base station are not limited thereto. For example, the base station may include more or fewer components than those described above. For example, the base station may include the transceiver 1010 and the controller 1020. In addition, the transceiver 1010, the controller 1020, and the storage device 1030 may be implemented as a single chip.

[0100] The base station's receiver and transmitter may be collectively referred to as a transceiver 1010. Transceiver 1010 can transmit and receive signals with a terminal, another base station, or another network device. In this case, the signals to be transmitted and received may include control information and data. For example, transceiver 1010 may transmit system information to the terminal and may transmit synchronization signals or reference signals. To this end, transceiver 1010 may include an RF transmitter for up-converting and amplifying the frequency of transmitted signals, an RF receiver for low-noise amplifying and down-converting received signals, and the like. However, this is merely an example of transceiver 1010, and thus, the components of transceiver 1010 are not limited to an RF transmitter and an RF receiver. Transceiver 1010 may include a wired or wireless transceiver and may include various components for transmitting and receiving signals. Furthermore, transceiver 1010 may receive signals via a communication channel (e.g., a wireless channel) and output the signals to controller 1020, and transmit signals output from controller 1020 via the communication channel. In addition, the transceiver 1010 may receive a communication signal, output the communication signal to the processor, and transmit the signal output from the processor to a terminal, another base station, or another entity through a wired or wireless network.

[0101] The storage device 1030 can store programs and data required for the operation of the base station. Furthermore, the storage device 1030 can store control information or data included in signals received by the base station. The storage device 1030 can be configured as a storage medium including ROM, RAM, a hard disk, a CD-ROM, a DVD, or the like, or a combination of storage media. Furthermore, the storage device 1030 can store at least one of information transmitted and received by the transceiver 1010 and information generated by the controller 1020.

[0102] In the present disclosure, the controller 1020 may be defined as a circuit, an application-specific integrated circuit, or at least one processor. The processor may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls upper layers such as application programs. The controller 1020 may control the overall operation of the base station according to the embodiments provided in the present disclosure. For example, the controller 1020 may control the signal flow between various blocks to perform operations according to the above-described flowchart. According to embodiments of the present disclosure, the controller 1020 may recognize that an emergency event has occurred while operating in NES mode. The controller 1020 may prepare to transmit an emergency signal and control the emergency signal to be transmitted at any time.

[0103] Figure 11 The structure of a terminal according to an embodiment of the present disclosure is shown.

[0104] refer to Figure 11 The terminal may include a transceiver 1110, a controller 1120, and a storage device 1130. The transceiver 1110, the controller 1120, and the storage device 1130 may operate according to the above-described terminal communication method. However, the components of the terminal are not limited thereto. For example, the terminal may include more or fewer components than those described above. For example, the terminal may include the transceiver 1110 and the controller 1120. Furthermore, the transceiver 1110, the controller 1120, and the storage device 1130 may be implemented as a single chip.

[0105] The terminal's receiver and transmitter may be collectively referred to as a transceiver 1110, and the transceiver 1110 may transmit and receive signals with a base station, another terminal, or another network entity. Signals transmitted to and received from the base station may include control information and data. For example, the transceiver 1110 may receive system information destined for the base station and may receive synchronization signals or reference signals. To this end, the transceiver 1110 may include an RF transmitter for up-converting and amplifying the frequency of the signal to be transmitted, an RF receiver for low-noise amplifying and down-converting the frequency of the received signal, and the like. However, this is merely an example of the transceiver 1110, and thus the components of the transceiver 1110 are not limited to an RF transmitter and an RF receiver. Furthermore, the transceiver 1110 may include a wired or wireless transceiver and may include various components for transmitting and receiving signals. Furthermore, the transceiver 1110 may receive signals via a wireless channel and output the signals to the controller 1120, and transmit signals output from the controller 1120 via a wireless channel. In addition, the transceiver 1110 may receive a communication signal, output the communication signal to the processor, and transmit the signal output from the processor to a network entity through a wired or wireless network.

[0106] The storage device 1130 can store programs and data required for the operation of the terminal. In addition, the memory can store control information or data included in the signal obtained by the terminal. The storage device 1130 can be configured as a storage medium including ROM, RAM, hard disk, CD-ROM, DVD, etc., or a combination of storage media.

[0107] In the present disclosure, controller 1120 may be defined as a circuit, an application-specific integrated circuit, or at least one processor. The processor may include a communication processor (CP) that performs communication control and an application processor (AP) that controls upper layers such as application programs. Controller 1120 may control the overall operation of the terminal according to the embodiments provided in this disclosure. For example, controller 1120 may control the signal flow between various blocks to perform operations according to the above-described flowchart. According to embodiments of the present disclosure, controller 1120 may control transceiver 1110 to receive a configuration from a base station for transmitting an emergency signal in an NES cell. Controller 1120 may control the reception of emergency signals at any time.

[0108] The methods according to the embodiments described in the claims or the specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

[0109] When implementing the method via software, a computer-readable storage medium may be provided to store one or more programs (software modules). The one or more programs stored in the computer-readable storage medium may be configured to be executed by one or more processors in an electronic device. The one or more programs may include instructions for causing the electronic device to perform the method according to the embodiments of the present disclosure described in the specification or claims.

[0110] These programs (software modules or software) may be stored in random access memory, nonvolatile memory including flash memory, read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), magnetic disk storage, compact disc-ROM (CD-ROM), digital versatile disk (DVD), other types of optical storage devices, or magnetic tape cassettes. Furthermore, the programs may be stored in a memory configured by a combination of some or all of these storage devices. Furthermore, each constituent memory may be provided in plurality.

[0111] Furthermore, the program may be stored in an attachable storage device that can be accessed via a communication network such as the Internet, an intranet, a local area network (LAN), a wide area LAN (WLAN), or a storage area network (SAN), or via a communication network configured by any combination thereof. Such a storage device may be connected to the apparatus for executing embodiments of the present disclosure via an external port. Furthermore, a separate storage device on a communication network may be connected to the apparatus for executing embodiments of the present disclosure.

[0112] In the above-mentioned specific embodiments of the present disclosure, the components included in the present disclosure are expressed in the singular or plural according to the specific embodiments presented in the present disclosure. However, for the convenience of description, the singular or plural expression is appropriately selected according to the presented situation. The present disclosure is not limited to singular or plural components, and a component expressed in the plural may even be configured in the singular, or a component expressed in the singular may even be configured in the plural.

[0113] While specific embodiments have been described in detail herein, it is apparent that various modifications are possible without departing from the scope of the present disclosure. Therefore, the scope of the present disclosure should not be limited to the described embodiments, but should be determined not only by the scope of the claims described later, but also by the equivalent scope of the claims.

[0114] Although the present disclosure has been described with various embodiments, various changes and modifications may be suggested to one skilled in the art. It is intended that the present disclosure encompass such changes and modifications as fall within the scope of the appended claims.

Claims

1. A method performed by a base station in a wireless communication system, the method comprising: sending a message including configuration information for sending an emergency signal associated with a network energy saving (NES) mode to a terminal; in case the cell operates in NES mode, determining whether a predetermined emergency event is detected during an NES active period; as well as Based on determining that a predetermined emergency event is detected, an emergency signal is sent to the terminal.

2. The method according to claim 1, wherein The paging occasion is monitored by the terminal during idle mode according to a period determined based on configuration information.

3. The method according to claim 1, further comprising: Based on determining that a predetermined emergency event is detected, a determination is made as to whether to wake up to transmit an emergency signal.

4. The method according to claim 1 , further comprising, in order to send an emergency signal: switching the operating mode from an NES active mode corresponding to an NES active period to an NES inactive mode during a period after a predetermined emergency event is detected; and In NES inactive mode, the emergency signal is sent during the next cycle.

5. The method according to claim 4, further comprising: After the emergency signal is sent during the period, the operation mode is switched from the NES inactive mode to the NES active mode.

6. The method according to claim 1, wherein Determining whether a predetermined emergency event is detected also includes: Information associated with a predetermined emergency event is received from a core network entity.

7. A method performed by a terminal in a wireless communication system, the method comprising: receiving, from a base station, a message including configuration information for receiving an emergency signal associated with a network energy saving (NES) mode; monitoring paging occasions during idle mode according to a period determined based on the configuration information; as well as When a predetermined emergency event is detected during an NES active period, an emergency signal is received from a base station based on a paging occasion monitored during an idle mode, wherein the cell operates in the NES mode.

8. The method according to claim 7, wherein: The configuration information includes at least one of information associated with the paging occasion and information associated with a cycle for monitoring the paging occasion.

9. A base station in a wireless communication system, the base station comprising: transceiver; and at least one processor operatively coupled to the transceiver, the at least one processor configured to: transmitting, via the transceiver, to the terminal a message including configuration information for transmitting an emergency signal associated with a network energy saving (NES) mode, determining whether a predetermined emergency event is detected during an NES active period if the cell operates in the NES mode, and Based on determining that the predetermined emergency event is detected, an emergency signal is transmitted to the terminal via the transceiver.

10. The base station according to claim 9, wherein: The paging occasion is monitored by the terminal during idle mode according to a period determined based on configuration information. The base station according to claim 9 , wherein: The at least one processor is further configured to: Based on determining that a predetermined emergency event is detected, a determination is made as to whether to wake up to transmit an emergency signal.

12. The base station according to claim 9, wherein: The at least one processor is further configured to: switching the operating mode from the NES active mode corresponding to the NES active period to the NES inactive mode during a period after the predetermined emergency event is detected, and In NES inactive mode, the emergency signal is sent during the next cycle.

13. The base station according to claim 12, wherein: The at least one processor is further configured to: After the emergency signal is sent during the period, the operation mode is switched from the NES inactive mode to the NES active mode.

14. The base station according to claim 9, wherein: The at least one processor is further configured to: Information associated with a predetermined emergency event is received from a core network entity.

15. A terminal in a wireless communication system, the terminal comprising: transceiver; and at least one processor operatively coupled to the transceiver, the at least one processor configured to: receiving, via the transceiver, from a base station a message including configuration information for receiving an emergency signal associated with a network energy saving (NES) mode, monitoring paging occasions during idle mode according to a period determined based on the configuration information, and When a predetermined emergency event is detected during an NES active period, an emergency signal is received from a base station based on a paging occasion monitored during an idle mode, wherein the cell operates in the NES mode.

Images