Method and apparatus for data transmission of low power device in communication system

Abstract

The present specification provides a method for transmitting and receiving a signal with low power in a communication system. More specifically, the method performed by a second terminal comprises the steps of: transmitting and receiving a first signal to and from a first terminal through a monitoring duration of a sidelink, wherein the monitoring duration includes a listening duration and a receiving duration; harvesting energy through the listening duration; and transmitting a second signal on the basis of the harvested energy.

Description

Method and device for transmitting data of a low-power device in a communication system

[0001] This specification relates to a method for transmitting data in a communication system, and more particularly, to a method and apparatus for transmitting data in a low-power device.

[0002] Existing IoT devices (e.g. RFID, etc.) are used for asset identification or barcodes, but they have a limited reading range of a few meters, and when many IoT devices are placed nearby, they cause serious interference due to issues such as insufficient capacity of IoT reading devices or devices, or problems such as coverage, making it difficult or limited to provide desired services.

[0003] Additionally, in recent years, in data communication between base stations and terminals, the terminals are gradually becoming smaller in size and expanding to IoT devices that support battery-less devices or energy storage devices that do not require manual replacement or recharging, rather than devices that require manual replacement or recharging.

[0004] Accordingly, the purpose of this specification is to provide a method for effectively performing low-power data communication through an IoT device with lower complexity and lower power consumption than existing NB-IoT or eMTC.

[0005] In addition, the present specification aims to provide a method for transmitting data to or from a low-power device at low cost based on a wireless access system.

[0006] The present specification relates to a method for transmitting and receiving a signal in a communication system, wherein the method performed by a second terminal comprises the steps of transmitting and receiving a first signal through a monitoring duration of a sidelink with a first terminal, the monitoring duration including a listening duration and a receiving duration; harvesting energy through the listening duration; and transmitting a second signal based on the harvested energy.

[0007] Additionally, the listening section in the present specification is characterized by including at least one slot.

[0008] In addition, the method in the present specification is characterized by further including a step of transmitting instruction information notifying transmission of the second signal through a specific channel in the listening section.

[0009] In addition, the instruction information in this specification is characterized in that it is transmitted after a point in time when data is not received from the first terminal.

[0010] In addition, the point in time at which the data is not received in this specification is characterized as the point in time at which PSSCH (Physical Sidelink Shared Channel) transmission ends.

[0011] Additionally, in this specification, the specific channel is characterized as being a PSFCH (Physical Sidelink Feedback Channel).

[0012] In addition, in the present specification, the PSFCH does not include information related to feedback of the PSSCH, and control information indicating that the PSFCH does not include information related to feedback of the PSSCH is transmitted via DCI, RRC signaling, or MAC CE.

[0013] In addition, in the present specification, the second signal is characterized in that it is transmitted through the PSSCH or piggybacked with the instruction information through the PSFCH.

[0014] Additionally, in the present specification, the second signal is characterized in that it is transmitted when the harvested energy is greater than a threshold value.

[0015] In addition, the method in the present specification is characterized by further including a step of transmitting and receiving a third signal with the base station.

[0016] In addition, the present specification is characterized in that the energy is harvested through at least one of a signal received from the first terminal or a signal received from the base station.

[0017] In addition, in the present specification, the first terminal is characterized as being an IoT reading device, and the second terminal is characterized as being a low-power IoT device.

[0018] In addition, the present specification is characterized in that the method for transmitting and receiving a signal in a communication system, the method performed by a first terminal further includes the steps of: sensing a channel for data transmission in a monitoring duration of a sidelink, the monitoring duration including a listening duration and a receiving duration; transmitting data through a sidelink data channel in the listening duration based on the channel sensing; receiving indication information notifying signal transmission of a second terminal through a specific channel of the sidelink in the listening duration; and receiving a signal from the second terminal in the receiving duration.

[0019] In addition, the method in the present specification is characterized by further including a step of transitioning from the listening interval to the receiving interval at a specific symbol within a slot of the listening interval.

[0020] Additionally, in this specification, a specific symbol within the slot is characterized as being a GP (Guard Period) located at the end of the slot.

[0021] In addition, in this specification, it is characterized in that the transition from the listening section to the receiving section is performed when the instruction information is received.

[0022] In addition, in the present specification, the specific channel is a PSFCH (Physical Sidelink Feedback Channel), and the method further includes a step of transmitting control information indicating that information related to feedback of the PSSCH is not included in the PSFCH through DCI, RRC signaling, or MAC CE.

[0023] In addition, the method in the present specification is characterized by further including a step of reading a signal received from the second terminal.

[0024] In addition, the method in the present specification is characterized by further including a step of transmitting a signal received from the second terminal to a base station.

[0025] In addition, the present specification provides a second terminal for transmitting and receiving a signal in a communication system, comprising: an RF (Radio Frequency) module for transmitting and receiving a wireless signal; and a processor functionally connected to the RF module, wherein the processor transmits and receives a first signal through a monitoring duration of a sidelink with the first terminal, the monitoring duration including a listening duration and a receiving duration, harvests energy through the listening duration, and controls transmission of a second signal based on the harvested energy.

[0026] The method proposed in this specification can suppress unnecessary waste of wireless resources when transmitting / receiving data through mobile communication-based IoT communication, and has the effect of providing data transmission through complexity and power savings of ambient power-enabled IoT devices.

[0027] Figure 1 is a conceptual diagram showing an example of an internal block diagram of an IoT reader and an IoT device to which the method proposed in this specification can be applied.

[0028] Figure 2 is a diagram showing an example of an environment in which the UE proposed in this specification performs the role of an IoT leader.

[0029] Figure 3 is a diagram showing another example of an environment in which the UE proposed in this specification performs the role of an IoT leader.

[0030] Figure 4 shows an example of a frame structure for data transmission and reception of a low-power device proposed in this specification.

[0031] FIG. 5 is a flowchart illustrating an example of a method for performing data transmission of a low-power device proposed in this specification.

[0032] Figure 6 is a flowchart showing an example of a method for transmitting and receiving data between an IoT reader and an IoT device proposed in this specification.

[0033] Figure 7 is a flowchart illustrating another example of a method for transmitting and receiving data between an IoT reader and an IoT device proposed in this specification.

[0034] Figure 8 shows an example of an internal block diagram of a device proposed in this specification.

[0035] It should be noted that the technical terms used in this specification are merely used to describe specific embodiments and are not intended to limit the scope of the technology disclosed herein. Furthermore, unless specifically defined otherwise herein, the technical terms used herein should be interpreted as having a meaning generally understood by a person of ordinary skill in the art to which the technology disclosed herein pertains, and should not be interpreted in an excessively broad or narrow sense. Furthermore, if a technical term used herein is an incorrect technical term that does not accurately express the scope of the technology disclosed herein, it should be replaced with a technical term that can be correctly understood by a person of ordinary skill in the art to which the technology disclosed herein pertains. Furthermore, general terms used herein should be interpreted according to their dictionary definitions or according to the context, and should not be interpreted in an excessively narrow sense.

[0036] While terms including ordinal numbers, such as "first" and "second," used herein may be used to describe various components, these components should not be limited by these terms. These terms are used solely to distinguish one component from another. For example, without departing from the scope of the present invention, a first component could be referred to as a "second component," and similarly, a second component could also be referred to as a "first component."

[0037] Hereinafter, embodiments disclosed in this specification will be described in detail with reference to the attached drawings. Regardless of the drawing numbers, identical or similar components are given the same reference numbers and redundant descriptions thereof will be omitted.

[0038] Additionally, when describing the technology disclosed in this specification, detailed descriptions of related known technologies will be omitted if they are deemed to obscure the gist of the technology disclosed in this specification. Furthermore, it should be noted that the attached drawings are intended solely to facilitate understanding of the concepts of the technology disclosed in this specification and should not be construed as limiting the scope of the technology.

[0039]

[0040] Hereinafter, downlink (DL) refers to communication from a base station to a terminal, and uplink (UL) refers to communication from a terminal to a base station. In downlink, a transmitter may be part of a base station, and a receiver may be part of a terminal. In uplink, a transmitter may be part of a terminal, and a receiver may be part of a base station. A base station may be expressed as a first communication device, and a terminal may be expressed as a second communication device. A base station (BS) may be replaced by terms such as a fixed station, Node B, eNB (evolved-NodeB), gNB (Next Generation NodeB), BTS (base transceiver system), access point (AP: Access Point), network (5G network), AI system, RSU (road side unit), robot, etc. Additionally, the terminal may be fixed or mobile, and may be replaced with terms such as UE (User Equipment), MS (Mobile Station), UT (user terminal), MSS (Mobile Subscriber Station), SS (Subscriber Station), AMS (Advanced Mobile Station), WT (Wireless terminal), MTC (Machine-Type Communication) device, M2M (Machine-to-Machine) device, D2D (Device-to-Device) device, vehicle, robot, AI module, etc.

[0041] The following technologies can be used in various wireless access systems, such as CDMA, FDMA, TDMA, OFDMA, and SC-FDMA. CDMA can be implemented using wireless technologies such as UTRA (Universal Terrestrial Radio Access) or CDMA2000. TDMA can be implemented using wireless technologies such as GSM (Global System for Mobile communications) / GPRS (General Packet Radio Service) / EDGE (Enhanced Data Rates for GSM Evolution). OFDMA can be implemented using wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, and E-UTRA (Evolved UTRA). UTRA is a part of UMTS (Universal Mobile Telecommunications System). 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution) is a part of E-UMTS (Evolved UMTS) that uses E-UTRA, and LTE-A (Advanced) / LTE-A pro is an evolved version of 3GPP LTE. 3GPP NR (New Radio or New Radio Access Technology) is an evolved version of 3GPP LTE / LTE-A / LTE-A pro.

[0042] For clarity, the description is based on the 3GPP communication system (e.g., LTE-A, NR), but the technical idea of ​​the present invention is not limited thereto. LTE refers to technology after 3GPP TS 36.xxx Release 8. Specifically, LTE technology after 3GPP TS 36.xxx Release 10 is referred to as LTE-A, and LTE technology after 3GPP TS 36.xxx Release 13 is referred to as LTE-A pro. 3GPP NR refers to technology after TS 38.xxx Release 15. LTE / NR may be referred to as a 3GPP system. "xxx" refers to a standard document detail number. LTE / NR may be collectively referred to as a 3GPP system. For background technology, terms, abbreviations, etc. used in the description of the present invention, reference may be made to matters described in standard documents published prior to the present invention.

[0043]

[0044] Below, we will examine a method for transmitting and receiving data in a low-power device in the communication system proposed in this specification.

[0045] The service for providing data transmission for or from a low-power device (ambient power-enabled IoT device) at low cost based on the wireless access system proposed in this specification can be utilized in at least one of the use cases (1) to (4) below.

[0046] (1) Use case 1: Industrial Wireless Sensor Network (IWSN)

[0047] (2) Use case 2: Smart Logistics and Smart Warehousing

[0048] (3) Use case 3: Smart Home Network

[0049] (4) Use case 4: Smart Agriculture

[0050]

[0051] In order for the method proposed in this specification to be applicable, (1) first, the ambient power-supporting IoT device must be able to harvest energy and support communication using the collected energy at the same time, (2) second, although there are constraints such as complexity, size, and power consumption of the ambient power-supporting IoT device, it must be able to provide sufficient communication services to meet the requirements, and (3) third, the privacy and security of the user using the ambient power-supporting IoT device must be guaranteed.

[0052]

[0053] Figure 1 is a conceptual diagram showing an example of an internal block diagram of an IoT reader and an IoT device to which the method proposed in this specification can be applied.

[0054] Referring to FIG. 1, an IoT reader (100) is a device that can receive data from an IoT device, such as reading an IoT device (200), by requesting transmission of data to an IoT device or receiving a signal (structured or unstructured) transmitted by an IoT device to determine the presence or absence of an IoT device, identification of the IoT device, or information included in a signal received from the IoT device. The IoT reader (100) may be referred to as an IoT reading device, an IoT reader, etc., and may be expressed as a first terminal to distinguish it from an IoT device described later. When the IoT reader is expressed as a first terminal, the IoT device may be expressed as a second terminal.

[0055] In addition, the IoT leader may be configured to include a transmitter, a receiver, a power amplifier (PA), a low noise amplifier (LNA), and a transmit / receive antenna.

[0056] And, the IoT device (200) refers to a device that receives data or signals from an external device (e.g., an IoT reader, etc.) to perform asset identification or reading or a specific function through a barcode, etc., and the IoT device can perform this function through a base station, a repeater, a terminal (or a user device), as well as a dedicated device for reading.

[0057] The reading device used in this specification means a device that performs a reading function, and in order to control and / or manage the reading device or IoT device, data transmission and reception are required, and such data transmission and reception can be performed by sending a request to the IoT device and a response thereto, or transmitting data when a specific condition is satisfied within the IoT device.

[0058] In FIG. 1, the IoT device may be configured to include an RF harvester and a demodulator that harvest or accumulate energy through receiving data or signals.

[0059] And, the IoT device receives a signal from the IoT reader through a single carrier or multi-carrier, and transmits the signal to the IoT reader at low power.

[0060] That is, FIG. 1 shows an example in which the IoT device performs low-power transmission to the IoT leader by utilizing energy accumulated through a signal transmitted from the IoT leader (or a third party device) or an RF carrier wave.

[0061] The IoT leader of FIG. 1 can transmit a specific signal so that the IoT device can store energy, and the IoT device can receive a reference signal, control channel, or data channel transmitted between a base station and a terminal or between terminals, and harvest or accumulate energy to transmit data to an external device.

[0062] The term “terminal” used in this specification may be a concept including a UE, a device performing IoT functions, etc.

[0063]

[0064] Figure 2 is a diagram showing an example of an environment in which the UE proposed in this specification performs the role of an IoT leader.

[0065] In the case of FIG. 2, the IoT device (200) can receive a signal from the base station (300). That is, the IoT device can transmit and receive signals to and from the base station via uplink and / or downlink.

[0066] In the case of FIG. 2, as an example of transmitting data by utilizing the link (Downlink, Uplink) between a base station and a UE, the UE (UE1, 100) of FIG. 2 performs the function of an IoT leader (or IoT reading device), and the IoT device (IoT-device1, 200) can transmit and receive data with the base station (base station 1, 300) through uplink (UL) and downlink (DL), and can transmit and receive data with UE1 through sidelink. In this case, the IoT device (200) can receive a downlink signal or data through a downlink channel and downlink reference signal (e.g., PDCCH, PDSCH, RS, SS, PBCH, etc.) of the base station, and harvest or accumulate energy for data transmission to the IoT leader (100). The IoT device (200) may utilize the accumulated energy to directly transmit data to the base station, or may transmit data to the UE (100) instead of transmitting to the base station, or may transmit simultaneously to the base station and the UE. In this case, with respect to the data received from the IoT device (200), 1) the base station may read it directly, 2) the base station and the UE may read it together, 3) the base station may receive the content read from the UE, or 4) the base station may receive the data received by the UE from the IoT device from the UE for reading.

[0067]

[0068] Figure 3 is a diagram showing another example of an environment in which the UE proposed in this specification performs the role of an IoT leader.

[0069] In the case of Fig. 3, the IoT device (200) represents a case in which it cannot receive a signal from the base station (300). That is, Fig. 3 represents data transmission of the IoT device when the IoT device (200) cannot receive or utilize the link (Downlink, Uplink) between the base station and UE2.

[0070] In FIG. 3, UE (UE2, 100) represents an IoT leader, and IoT device (IoT-device2, 200) transmits and receives data with UE2 via sidelink. In this case, IoT device (200) can receive uplink data or uplink signals (e.g., PUCCH, PUSCH, RS, SSS, PRACH, etc.) transmitted by UE2 (100) to a base station and accumulate energy for data transmission. The IoT device (200) can transmit data to UE2 using the accumulated energy.

[0071] At this time, the data received from the IoT device (200) may be 1) directly read by the base station, 2) read by the base station and UE2 together, 3) received by the base station what has been read from UE2, or 4) received by the base station from UE2 for reading by the data received from the IoT device. In addition, since the UE2 is capable of transmitting and receiving data through the sidelink, the IoT device may receive sidelink data or signals (e.g., PSCCH, PSSCH, SPSS, SSSS, PSBCH, etc.) transmitted by the UE2 through the sidelink channel instead of uplink data transmitted by the UE2 to the base station, thereby accumulating energy for data transmission.

[0072] The IoT device can utilize the accumulated energy to transmit data to a terminal (UE2 or a third UE). At this time, the data received from the IoT device can be 1) directly read by UE2, or 2) UE2 can transmit the data received from the IoT device to the base station for reading.

[0073]

[0074] As previously discussed, IoT devices accumulate energy for data transmission, and can begin transmitting data once a certain level of energy has been accumulated to enable data transmission.

[0075] Figure 4 shows an example of a frame structure for data transmission and reception of a low-power device proposed in this specification.

[0076] In this specification, the frame of FIG. 4 used for data transmission and reception between the IoT device and the IoT leader can reuse the frame structure used in the sidelink. Even if a frame structure other than the frame used in the sidelink of FIG. 4 is used, the IoT device receives data in the part where the UE (or the IoT leader) transmits data, such as DMRS, PSCCH (physical sidelink control channel), and PSSCH (physical sidelink shared channel), and accumulates or harvests energy for data transmission of the IoT device, and when energy exceeds a certain level (or exceeds a threshold), the IoT device can start transmitting data or a signal in a resource region (e.g., PSFCH) where the IoT device can transmit data to the UE and where the data can be transmitted, such as PSFCH (Physical Sidelink Feedback Channel, 410) defined in the sidelink. Accordingly, the UE can receive data from the IoT device through the PSFCH (410).

[0077]

[0078] FIG. 5 is a flowchart illustrating an example of a method for performing data transmission of a low-power device proposed in this specification.

[0079] Referring to FIG. 5, a monitoring cycle may be defined for a UE (or IoT leader) to transmit and receive data. FIG. 5a illustrates an example of a monitoring cycle, and FIG. 5b illustrates an example of IoT device operation during a monitoring cycle. The monitoring cycle defined in FIG. 5a may also be referred to as a monitoring duration.

[0080] The above monitoring cycle may include a listening duration (511) and a receiving duration (512).

[0081] The above monitoring cycle (510) is a period in which the UE (or IoT leader) senses a channel for data transmission and reception, i.e., a monitoring period. The UE can select a data channel for data reception from an IoT device during the monitoring cycle. During the monitoring cycle, the UE can operate by applying a channel sensing procedure to use a sidelink data channel defined in the 3GPP standard.

[0082] The above listening section (511) indicates a section in which data transmission is possible by selecting a channel for data transmission by the UE, and data transmission is performed in slot units such as the frame illustrated in FIG. 4. In this case, the UE may transmit data for the IoT device or may transmit data to an external device such as a third-party UE. At this time, the IoT device may utilize the data received from the UE to accumulate energy for data transmission as discussed above. If the IoT device has accumulated energy above a certain level (or exceeding a threshold) for data transmission, the IoT device may transmit instruction information (520) notifying the IoT device of data transmission via the PSFCH after the UE in the slot ends data transmission (e.g., the point in time when the PSSCH transmission ends and data is no longer received from the UE). 530 in FIG. 5b represents the frame structure illustrated in FIG. 4.

[0083] The above-described reception section (512) is a section for receiving data, and within the reception section, after every slot (e.g., the last GP (420) of FIG. 4), the UE can transition or switch from the listening section to the reception section (or the UE can transition or switch its state from a listening state to a reception state). The reception section and the listening section of FIG. 5A may be fixedly determined in the monitoring cycle, but for more efficient operation, the UE may immediately end the listening section and transition to the reception section when it receives a PSFCH from the IoT device. That is, the IoT device may perform data transmission after energy accumulation without temporal synchronization of the listening section and the reception section with the UE. That is, the IoT device may transmit data to the UE in the listening section or the reception section. Additionally, if the UE does not receive data from the IoT device during the reception period, the UE may transition back to the listening period (or listening state) and utilize the listening period to receive data from another UE.

[0084] Meanwhile, if data within the listening interval is transmitted to another UE, the other UE may receive the data, and the PSFCH may omit information (e.g., feedback of PSSCH, CQI (Channel Quality Indicator), etc.) transmitted to PSCFH to be used for data transmission for the IoT device. In this case, the UE may instruct the other UE through PSCCH with the corresponding instruction (information transmitted through PSFCH is omitted), or the UE and the other UE may set the instruction from the beginning through DCI, RRC, MAC CE, etc. when transmitting data. As described above, when the IoT device (see FIG. 5b) has energy accumulation above a certain level and is capable of transmitting data, the IoT device transmits PSFCH with instruction information notifying data transmission at the time when data transmission from the UE ends (e.g., at the time when PSSCH transmission ends and data reception from the UE is no longer possible), so that the UE can receive data from the IoT device (e.g., after GP (420)), and the IoT device can transmit data to the UE.

[0085]

[0086] Figure 6 is a flowchart showing an example of a method for transmitting and receiving data between an IoT reader and an IoT device proposed in this specification.

[0087] First, the IoT device (or second terminal) transmits and receives a first signal through a monitoring duration of a sidelink with the IoT leader (or first terminal) (S610).

[0088] The above monitoring period may include a listening period and a receiving period. The listening period may include at least one slot.

[0089] And, the IoT device harvests energy through the listening section (S620).

[0090] And, the IoT device transmits instruction information notifying the transmission of the second signal through a specific channel in the listening section (S630).

[0091] The above instruction information may be transmitted after a time point at which data is not received from the first terminal, and the time point at which data is not received may be a time point at which PSSCH (Physical Sidelink Shared Channel) transmission ends.

[0092] The above specific channel may be a PSFCH (Physical Sidelink Feedback Channel).

[0093] In addition, the PSFCH may not include information related to feedback of the PSSCH, and control information indicating that the PSFCH does not include information related to feedback of the PSSCH may be transmitted via DCI, RRC signaling, or MAC CE.

[0094] And, the IoT device transmits a second signal based on the harvested energy (S640).

[0095] Here, the second signal may be transmitted via the PSSCH or piggybacked with the indication information via the PSFCH, and may be transmitted when the harvested energy is greater than a threshold value.

[0096] Additionally, the IoT device can transmit and receive third signals to and from a base station.

[0097] Step S620 may be performed via at least one of a signal received from the IoT leader or a signal received from the base station.

[0098]

[0099] Figure 7 is a flowchart illustrating another example of a method for transmitting and receiving data between an IoT reader and an IoT device proposed in this specification.

[0100] First, the IoT leader (or first terminal) senses a channel for data transmission in the monitoring duration of the sidelink (S710).

[0101] Here, the monitoring period may include a listening period and a receiving period.

[0102] And, the IoT leader transmits data through the side link data channel in the listening section based on the channel sensing (S720).

[0103] And, the IoT leader receives instruction information notifying signal transmission of the second terminal through a specific channel of the side link in the listening section (S730).

[0104] And, the IoT leader receives a signal from the IoT device in the receiving section (S740).

[0105] Additionally, the IoT leader can transition from the listening interval to the receiving interval at a specific symbol within a slot of the listening interval.

[0106] A specific symbol within the above slot may be a GP (Guard Period) located at the end of the slot.

[0107] And, the transition from the listening section to the receiving section can be performed when the instruction information is received.

[0108] The specific channel may be a PSFCH (Physical Sidelink Feedback Channel), and the IoT leader may transmit control information indicating that the PSFCH does not contain information related to feedback of the PSSCH via DCI, RRC signaling, or MAC CE.

[0109] Additionally, the IoT reader can read a signal received from the IoT device and transmit the reading result or a signal for reading to a base station or a third terminal.

[0110]

[0111] Figure 8 shows an example of an internal block diagram of a device proposed in this specification.

[0112] The device (800) of FIG. 8 may be a concept including a UE, an IoT device, an IoT reader, etc. described in this specification.

[0113] A device (800) for implementing a method or function proposed in this specification may include a control unit (or processor, 820), a storage unit (temporary or non-temporary storage device) (or memory, 830), a bus (not shown) for data transmission or a communication unit (810) for communicating with the outside, and an output unit (840).

[0114] The storage unit may include magnetic storage media or flash storage media, but the scope of the present invention is not limited thereto.

[0115] The communication unit may be composed of wired and / or wireless communication modules. For example, the communication unit may include wireless communication modules such as Wireless Fidelity (Wi-Fi), Bluetooth, Zigbee, near field communication (NFC), Wireless Broadband Internet (Wibro), 3G, 4G, 5G, and 6G, and wired communication modules such as a wired LAN such as Ethernet. The communication unit may perform wired / wireless communication with a user device via a network.

[0116] The control unit may include any type of device capable of processing data, such as a processor. Here, the term "processor" may refer to a data processing device built into hardware, for example, having a physically structured circuit to perform a function expressed by a code or instruction included in a program. Examples of such data processing devices built into hardware include processing devices such as a microprocessor, a central processing unit (CPU), a processor core, a multiprocessor, an application-specific integrated circuit (ASIC), and a field programmable gate array (FPGA), but the scope of the present invention is not limited thereto.

[0117] In addition, the control unit or processor of the IoT device can control to transmit and receive a first signal through a monitoring duration of an IoT reader and a sidelink, the monitoring duration including a listening duration and a receiving duration, harvest energy through the listening duration, and transmit a second signal based on the harvested energy.

[0118] The output unit is for generating output related to visual, auditory, or tactile sensations, and may include at least one of a display unit, an audio output unit, a haptic module, and an optical output unit. The display unit may be formed as a layer structure with a touch sensor or formed as an integral part, thereby implementing a touch screen. Such a touch screen may function as a user input unit that provides an input interface between the device and the user, and at the same time, may provide an output interface between the device and the user.

[0119]

[0120] The embodiments described above are combinations of components and features of the present invention in a predetermined form. Each component or feature should be considered optional unless explicitly stated otherwise. Each component or feature may be implemented without being combined with other components or features. Furthermore, it is also possible to form an embodiment of the present invention by combining some components and / or features. The order of operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment. It is self-evident that claims that do not have an explicit citation relationship in the patent claims may be combined to form an embodiment or may be incorporated as a new claim through a post-application amendment.

[0121] Embodiments of the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In the case of hardware implementation, an embodiment of the present invention may be implemented by one or more ASICs (Application Specific Integrated Circuits), DSPs (Digital Signal Processors), DSPDs (Digital Signal Processing Devices), PLDs (Programmable Logic Devices), FPGAs (Field Programmable Gate Arrays), processors, controllers, microcontrollers, microprocessors, etc.

[0122] When implemented via firmware or software, an embodiment of the present invention may be implemented in the form of a module, procedure, function, or the like that performs the functions or operations described above. The software code may be stored in memory and executed by a processor. The memory may be located within or external to the processor and may exchange data with the processor via various known means.

[0123] It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the essential characteristics thereof. Therefore, the above detailed description should not be construed as limiting in any respect, but rather as illustrative. The scope of the present invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the scope of equivalents of the present invention are intended to be included within the scope of the present invention.

[0124] The method of transmitting and receiving data in the communication system of the present invention has been described with a focus on examples applied to the 3GPP LTE / LTE-A system and the 5G system (New RAT system), but it can also be applied to various other wireless communication systems.

Claims

1. In a method for transmitting and receiving a signal in a communication system, the method performed by a second terminal comprises: A step of transmitting and receiving a first signal through a monitoring duration of a first terminal and a sidelink, The above monitoring period includes a listening period and a receiving period; A step of harvesting energy through the above listening section; and A method characterized by comprising a step of transmitting a second signal based on the harvested energy.

2. In paragraph 1, A method characterized in that the above listening section includes at least one slot.

3. In paragraph 2, A method characterized in that it further comprises a step of transmitting instruction information notifying transmission of the second signal through a specific channel in the listening section.

4. In paragraph 3, A method characterized in that the above instruction information is transmitted after a point in time when data is not received from the first terminal.

5. In paragraph 4, A method characterized in that the point in time at which the above data is not received is the point in time at which PSSCH (Physical Sidelink Shared Channel) transmission ends.

6. In paragraph 5, A method characterized in that the above specific channel is a PSFCH (Physical Sidelink Feedback Channel).

7. In paragraph 6, The above PSFCH does not contain information related to feedback of the PSSCH, A method characterized in that control information indicating that information related to feedback of the PSSCH is not included in the PSFCH is transmitted via DCI, RRC signaling or MAC CE.

8. In paragraph 7, A method characterized in that the second signal is transmitted through the PSSCH or piggybacked with the instruction information through the PSFCH.

9. In paragraph 1, A method characterized in that the second signal is transmitted when the harvested energy is greater than a threshold value.

10. In paragraph 1, A method characterized by further comprising the step of transmitting and receiving a third signal to and from a base station.

11. In paragraph 10, A method characterized in that the energy is harvested through at least one of a signal received from the first terminal or a signal received from the base station.

12. In paragraph 1, A method characterized in that the first terminal is an IoT reading device and the second terminal is a low-power IoT device.

13. In a method for transmitting and receiving a signal in a communication system, the method performed by a first terminal comprises: A step of sensing a channel for data transmission in the monitoring duration of the sidelink; The above monitoring period includes a listening period and a receiving period; A step of transmitting data through a sidelink data channel in the listening section based on the channel sensing; A step of receiving instruction information notifying signal transmission of a second terminal through a specific channel of the side link in the above listening section; and A method characterized in that it further comprises a step of receiving a signal from the second terminal in the receiving section.

14. In paragraph 13, A method characterized by further comprising a step of transitioning from the listening interval to the receiving interval at a specific symbol within a slot of the listening interval.

15. In paragraph 14, A method characterized in that a specific symbol within the above slot is a GP (Guard Period) located at the end of the slot.

16. In paragraph 14, A method characterized in that the transition from the listening section to the receiving section is performed when the instruction information is received.

17. In paragraph 16, The above specific channel is PSFCH (Physical Sidelink Feedback Channel), A method further comprising the step of transmitting control information indicating that information related to feedback of the PSSCH is not included in the PSFCH via DCI, RRC signaling or MAC CE.

18. In paragraph 13, A method characterized in that it further comprises a step of reading a signal received from the second terminal.

19. In paragraph 18, A method characterized in that it further comprises a step of transmitting a signal received from the second terminal to a base station.

20. In a second terminal for transmitting and receiving signals in a communication system, RF (Radio Frequency) module for transmitting and receiving wireless signals; and A processor functionally connected to the RF module, the processor comprising: A terminal characterized in that it transmits and receives a first signal through a monitoring duration of a first terminal and a sidelink, the monitoring duration including a listening duration and a receiving duration, harvests energy through the listening duration, and controls to transmit a second signal based on the harvested energy.

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