Method and device for transmitting and receiving random access message of ambient internet of things device

Abstract

A method and device for transmitting and receiving a random access message of a terminal in a wireless communication system are provided. The terminal receives, from a reader, contention resource information for at least one resource divided into time and frequency domains and selects a specific resource on the basis of the received contention resource information. In addition, the terminal transmits a first message to the reader through the selected specific resource, and receives a physical reader to device channel (PRDCH) from the reader, wherein whether to transmit a second message, which is a response to the first message, is indicated through the PRDCH.

Description

Method and device for transmitting and receiving random access messages of ambient IoT devices

[0001] This specification relates to wireless communication applicable to 5G NR, 5G-Advanced, and 6G.

[0002] As the times change and more communication devices demand larger communication traffic, there is a demand for next-generation 5G systems, which are wireless broadband communication systems that are improved over existing LTE systems. In these next-generation 5G systems, referred to as NewRAT, communication scenarios are classified into Enhanced Mobile BroadBand (eMBB), Ultra-reliability and low-latency communication (URLLC), and Massive Machine-Type Communications (mMTC).

[0003] Here, eMBB is a next-generation mobile communication scenario characterized by high spectrum efficiency, high user experience data rate, and high peak data rate; URLLC is a next-generation mobile communication scenario characterized by ultra-reliability, ultra-low latency, and ultra-high availability (e.g., V2X, emergency service, remote control); and mMTC is a next-generation mobile communication scenario characterized by low cost, low energy, short packet, and massive connectivity (e.g., IoT (Internet of Things)).

[0004] One disclosure of the present specification is to provide a method and device for transmitting and receiving arbitrary connection messages of an ambient Internet of Things device, i.e., a terminal, in a wireless communication system.

[0005] One embodiment of the present specification describes a wireless communication system in which a terminal receives competitive resource information regarding at least one resource divided into time and frequency domains, and selects a specific resource based on the received competitive resource information. Additionally, the terminal transmits a first message through the selected specific resource and receives a PRDCH (Physical Reader to Device Channel), and provides a method in which the PRDCH indicates whether to transmit a second message, which is a response to the first message.

[0006] Additionally, in one embodiment of the present specification, in a wireless communication system, a reader transmits competitive resource information for at least one resource divided into time and frequency domains and receives a first message through a specific resource. Additionally, after receiving the first message, the reader transmits a PRDCH (Physical Reader to Device Channel), and provides a method in which the PRDCH indicates whether to transmit a second message, which is a response to the first message.

[0007] Additionally, one embodiment of the present specification provides a wireless communication system comprising at least one processor and at least one memory that stores instructions and is operablely electrically connected to at least one processor, wherein the operation performed based on the instruction being executed by at least one processor comprises: receiving competition resource information for at least one resource divided into time and frequency domains, and selecting a specific resource based on the received competition resource information. Additionally, a terminal is provided that transmits a first message through the selected specific resource and receives a PRDCH (Physical Reader to Device Channel), wherein the PRDCH indicates whether to transmit a second message which is a response to the first message.

[0008] Additionally, one embodiment of the present specification comprises, in a wireless communication system, at least one processor and at least one memory that stores instructions and is operablely electrically connected to at least one processor, and based on instructions being executed by at least one processor, an operation performed is: transmitting contention resource information for at least one resource divided into time and frequency domains, and receiving a first message through a specific resource. Additionally, after receiving the first message, a PRDCH (Physical Reader to Device Channel) is transmitted, and a reader is provided in which the PRDCH indicates whether to transmit a second message which is a response to the first message.

[0009] Whether the second message is transmitted can be indicated through an EI (Early Indication) field, and the EI field may be in the form of a bitmap.

[0010] In addition, whether the second message is transmitted may be indicated within the monitoring period for the EI field. To this end, the reader may transmit monitoring period information for the EI field to the terminal, and the terminal may receive it.

[0011] Meanwhile, the specific resource mentioned above may be an RO (RACH (Random Access Channel) Occasion) arbitrarily selected from at least one of the resources mentioned above.

[0012] According to the disclosure of this specification, a device (i.e., a terminal) that receives an Early Indication (EI) of message 2 (MSG2) in a wireless communication system can check in advance whether its message 1 (MSG1) has been successfully transmitted through an EI corresponding to the RO selected by the device. Accordingly, a device that has transmitted MSG1 but failed to occupy resources will no longer monitor MSG2, thereby achieving an overall energy saving effect.

[0013] Figure 1 is a diagram illustrating a wireless communication system.

[0014] Figure 2 illustrates the structure of a wireless frame used in NR.

[0015] FIGS. 3a to 3c are exemplary diagrams illustrating exemplary architectures for wireless communication services.

[0016] Figure 4 illustrates the slot structure of an NR frame.

[0017] Figure 5 illustrates an example of a subframe type in NR.

[0018] Figure 6 illustrates the structure of a self-contained slot.

[0019] Figure 7 shows an example of an Access Stratum (AS) procedure between an ambient IoT device and a reader.

[0020] FIGS. 8a and 8b are drawings illustrating message 2 transmission option 1 for ambient IoT devices.

[0021] FIG. 9 is a diagram illustrating message 2 transmission option 2 for an ambient IoT device.

[0022] FIGS. 10a and 10b are another diagram illustrating message 2 transmission option 1 for an ambient IoT device.

[0023] FIG. 11 is a flowchart illustrating a method of operation of a terminal according to one embodiment of the present specification.

[0024] FIGS. 12a and 12b are drawings for explaining the monitoring and reception of message 2 according to one embodiment of the present specification.

[0025] FIGS. 13a and 13b illustrate procedures for a reader and a terminal according to an embodiment of the present specification.

[0026] FIGS. 14a and 14b illustrate procedures for a reader and a terminal according to another embodiment of the present specification.

[0027] FIG. 15 shows an apparatus according to one embodiment of the present specification.

[0028] FIG. 16 is a block diagram showing the configuration of a terminal according to one embodiment of the present specification.

[0029] FIG. 17 shows a block diagram of a processor in which the disclosure of the present specification is implemented.

[0030] FIG. 18 is a block diagram showing in detail the transceiver of the first device shown in FIG. 15 or the transceiver of the device shown in FIG. 16.

[0031] It should be noted that technical terms used in this specification are used merely to describe specific embodiments and are not intended to limit the content of this specification. Furthermore, unless specifically defined otherwise in this specification, technical terms used in this specification should be interpreted in the sense generally understood by those skilled in the art to which this disclosure pertains, and should not be interpreted in an overly broad or overly narrow sense. Additionally, if a technical term used in this specification is an incorrect technical term that fails to accurately express the content and concept of this specification, it should be understood as being replaced by a technical term that can be correctly understood by those skilled in the art. Moreover, general terms used in this specification should be interpreted according to their prior definitions or the context, and should not be interpreted in an overly narrow sense.

[0032] Additionally, singular expressions used in this specification include plural expressions unless the context clearly indicates otherwise. In this application, terms such as "composed of" or "have" should not be interpreted as necessarily including all of the various components or steps described in the specification, and should be interpreted as meaning that some of the components or steps may be omitted or additional components or steps may be included.

[0033] Additionally, terms including ordinal numbers, such as first, second, etc., used herein may be used to describe various components, but said components shall not be limited by said terms. Such terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the rights, the first component may be named the second component, and similarly, the second component may be named the first component.

[0034] When it is stated that a component is connected to or coupled with another component, it may be directly connected to or coupled with that other component, or there may be other components in between. On the other hand, when it is stated that a component is directly connected to or directly coupled with another component, it should be understood that there are no other components in between.

[0035] Hereinafter, embodiments will be described in detail with reference to the attached drawings. Identical or similar components regardless of drawing symbols are assigned the same reference number, and redundant descriptions thereof will be omitted. Furthermore, in describing the contents of this specification, if it is determined that a detailed description of related prior art may obscure the gist of this specification, such detailed description will be omitted. Additionally, it should be noted that the attached drawings are intended only to facilitate understanding of the contents and concepts of this specification, and should not be interpreted as limiting the contents and concepts of this specification. The contents and concepts of this specification should be interpreted as extending to all modifications, equivalents, and substitutions in addition to the attached drawings.

[0036] In this specification, “A or B” may mean “only A,” “only B,” or “both A and B.” Alternatively, in this specification, “A or B” may be interpreted as “A and / or B.” For example, in this specification, “A, B or C” may mean “only A,” “only B,” “only C,” or “any combination of A, B and C.”

[0037] As used herein, a slash ( / ) or a comma may mean “and / or.” For example, “A / B” may mean “A and / or B.” Accordingly, “A / B” may mean “only A,” “only B,” or “both A and B.” For example, “A, B, C” may mean “A, B or C.”

[0038] In this specification, “at least one of A and B” may mean “only A,” “only B,” or “both A and B.” Additionally, in this specification, the expressions “at least one of A or B” or “at least one of A and / or B” may be interpreted as synonymous with “at least one of A and B.”

[0039] Additionally, in this specification, “at least one of A, B and C” may mean “only A,” “only B,” “only C,” or “any combination of A, B and C.” Additionally, “at least one of A, B or C” or “at least one of A, B and / or C” may mean “at least one of A, B and C.”

[0040] Additionally, parentheses used in this specification may mean “for example.” Specifically, where indicated as “Control Information (PDCCH),” “PDCCH (Physical Downlink Control Channel)” may be proposed as an example of “Control Information.” In other words, “Control Information” in this specification is not limited to “PDCCH,” and “PDDCH” may be proposed as an example of “Control Information.” Furthermore, even when indicated as “Control Information (i.e., PDCCH),” “PDCCH” may be proposed as an example of “Control Information.”

[0041] Technical features described individually within a single drawing in this specification may be implemented individually or simultaneously.

[0042] In the attached drawings, User Equipment (UE) is illustrated as an example, but the illustrated UE may also be referred to by terms such as Terminal or Mobile Equipment (ME). Furthermore, the UE may be a portable device such as a laptop, mobile phone, PDA, smartphone, multimedia device, etc., or a non-portable device such as a PC or vehicle-mounted device.

[0043] In the following, UE is used as an example of a wireless communication-capable device (e.g., wireless communication device, wireless device, or wireless apparatus). The operations performed by the UE may be performed by any wireless communication-capable device. A wireless communication-capable device may also be referred to as a wireless communication device, wireless device, or wireless apparatus.

[0044] The term "base station" as used below generally refers to a fixed station that communicates with wireless devices, and can be used as a comprehensive term including eNodeB (evolved-NodeB), eNB (evolved-NodeB), BTS (Base Transceiver System), Access Point, gNB (Next generation NodeB), RRH (remote radio head), TP (transmission point), RP (reception point), relay, etc.

[0045] This specification describes embodiments using LTE systems, LTE-A systems and NR systems, but these embodiments may be applied to any communication system corresponding to the above definitions.

[0046] Wireless Communication System

[0047] Building on the success of LTE (long term evolution) / LTE-Advanced (LTE-A) for 4th generation mobile communication, commercialization and subsequent research for the next generation, namely 5th generation (so-called 5G) mobile communication, are also continuing.

[0048] Fifth-generation mobile communication, as defined by the International Telecommunication Union (ITU), refers to providing data transmission speeds of up to 20 Gbps and a perceived transmission speed of at least 100 Mbps anywhere. It is officially referred to as 'IMT-2020'.

[0049] The ITU presents three major usage scenarios, such as eMBB (enhanced Mobile BroadBand), mMTC (massive Machine Type Communication), and URLLC (Ultra Reliable and Low Latency Communications).

[0050] URLLC concerns use scenarios requiring high reliability and low latency. For example, services such as autonomous driving, factory automation, and augmented reality require high reliability and low latency (e.g., latency of 1ms or less). Currently, the latency of 4G (LTE) is statistically 21-43ms (best 10%) and 33-75ms (median). This is insufficient to support services requiring latency of 1ms or less. Next, eMBB use scenarios concern use scenarios requiring mobile ultra-broadband.

[0051] In other words, 5th generation mobile communication systems support higher capacity than current 4G LTE, increase the density of mobile broadband users, and can support D2D (Device to Device), high stability, and MTC (Machine type communication). 5G research and development also aims for lower latency and lower battery consumption than 4G mobile communication systems to better implement the Internet of Things. New radio access technology (New RAT or NR) may be proposed for such 5G mobile communication.

[0052] The NR frequency band can be defined by two types of frequency ranges (FR1, FR2). The numerical values ​​of the frequency ranges may change; for example, the two types of frequency ranges (FR1, FR2) may be as shown in Table 1 below. For convenience of explanation, among the frequency ranges used in the NR system, FR1 may mean the “sub 6GHz range” and FR2 may mean the “above 6GHz range” and may be referred to as millimeter wave (mmW).

[0053] Frequency Range designationCorresponding frequency rangeSubcarrier SpacingFR1410MHz - 7125MHz15, 30, 60kHzFR224250MHz - 52600MHz60, 120, 240kHz

[0054] The numerical values ​​of the frequency range of the NR system may change. For example, FR1 may include a band of 410 MHz to 7125 MHz as shown in Table 1. That is, FR1 may include a frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) or higher. For example, the frequency band of 6 GHz (or 5850, 5900, 5925 MHz, etc.) or higher included within FR1 may include an unlicensed band. The unlicensed band may be used for various purposes, for example, for communication for vehicles (e.g., autonomous driving).

[0055] Meanwhile, 3GPP-based communication standards define downlink physical channels corresponding to resource elements that carry information originating from upper layers, and downlink physical signals corresponding to resource elements used by the physical layer but not carrying information originating from upper layers. For example, physical downlink shared channel (PDSCH), physical broadcast channel (PBCH), physical multicast channel (PMCH), physical control format indicator channel (PCFICH), physical downlink control channel (PDCCH), and physical hybrid ARQ indicator channel (PHICH) are defined as downlink physical channels, and reference signals and synchronization signals are defined as downlink physical signals. A reference signal (RS), also referred to as a pilot, refers to a signal of a specific waveform that is known to both the gNB and the UE. For example, cell-specific RS, UE-specific RS (UE-RS), positioning RS (PRS), and channel state information RS (CSI-RS) are defined as downlink reference signals. The 3GPP LTE / LTE-A standard defines uplink physical channels corresponding to resource elements that carry information originating from upper layers, and uplink physical signals corresponding to resource elements used by the physical layer but that do not carry information originating from upper layers.For example, the physical uplink shared channel (PUSCH), physical uplink control channel (PUCCH), and physical random access channel (PRACH) are defined as uplink physical channels, and the demodulation reference signal (DMRS) for uplink control / data signals and the sounding reference signal (SRS) used for uplink channel measurement are defined.

[0056] In this specification, PDCCH (Physical Downlink Control Channel) / PCFICH (Physical Control Format Indicator Channel) / PHICH (Physical Hybrid automatic retransmit request Indicator Channel) / PDSCH (Physical Downlink Shared Channel) each refers to a set of time-frequency resources or a set of resource elements carrying DCI (Downlink Control Information) / CFI (Control Format Indicator) / downlink ACK / NACK (ACKnowlegement / Negative ACK) / downlink data. Additionally, PUCCH (Physical Uplink Control Channel) / PUSCH (Physical Uplink Shared Channel) / PRACH (Physical Random Access Channel) each refers to a set of time-frequency resources or a set of resource elements carrying UCI (Uplink Control Information) / uplink data / random access signals.

[0057] Figure 1 is a diagram illustrating a wireless communication system.

[0058] As can be seen with reference to FIG. 1, the wireless communication system includes at least one base station (BS). The BS is divided into a gNodeB (or gNB) (20a) and an eNodeB (or eNB) (20b). The gNB (20a) supports 5th generation mobile communication. The eNB (20b) supports 4th generation mobile communication, i.e., LTE (Long Term Evolution).

[0059] Each base station (20a and 20b) provides communication services for a specific geographical area (generally called a cell) (20-1, 20-2, 20-3). A cell can be further divided into multiple areas (called sectors).

[0060] User Equipment (UE) typically belongs to a single cell, and the cell to which the UE belongs is called the serving cell. The base station that provides communication services to the serving cell is called the serving base station (serving BS). Since the wireless communication system is a cellular system, there exists another cell adjacent to the serving cell. The other cell adjacent to the serving cell is called the neighbor cell. The base station that provides communication services to the neighbor cell is called the neighbor base station (neighbor BS). The serving cell and neighbor cells are determined relatively to the UE.

[0061] In the following, the downlink refers to communication from the base station (20) to the UE (10), and the uplink refers to communication from the UE (10) to the base station (20). In the downlink, the transmitter may be part of the base station (20) and the receiver may be part of the UE (10). In the uplink, the transmitter may be part of the UE (10) and the receiver may be part of the base station (20).

[0062] Meanwhile, wireless communication systems can be broadly classified into Frequency Division Duplex (FDD) and Time Division Duplex (TDD) methods. In the FDD method, uplink and downlink transmissions occupy different frequency bands. In the TDD method, uplink and downlink transmissions occupy the same frequency band and occur at different times. The channel response in the TDD method is practically reciprocal. This means that the downlink channel response and the uplink channel response are nearly identical within a given frequency range. Therefore, in a wireless communication system based on TDD, there is an advantage in that the downlink channel response can be derived from the uplink channel response. In the TDD method, since the entire frequency band is time-divided for uplink and downlink transmissions, downlink transmission by the base station and uplink transmission by the UE cannot be performed simultaneously. In a TDD system where uplink and downlink transmissions are separated by subframes, uplink and downlink transmissions are performed in different subframes.

[0063] Figure 2 illustrates the structure of a wireless frame used in NR.

[0064] In NR, uplink and downlink transmissions consist of frames. A radio frame has a length of 10 ms and is defined as two 5 ms half-frames (HF). A half-frame is defined as five 1 ms subframes (SF). A subframe is divided into one or more slots, and the number of slots within a subframe depends on the subcarrier spacing (SCS). Each slot contains 12 or 14 OFDM(A) symbols depending on the cyclic prefix (CP). When a standard CP is used, each slot contains 14 symbols. When an extended CP is used, each slot contains 12 symbols. Here, the symbols may include OFDM symbols (or CP-OFDM symbols) or SC-FDMA symbols (or DFT-s-OFDM symbols).

[0065] Support for various numerologies

[0066] In NR systems, as wireless communication technology develops, multiple numerologies may be provided to the terminal. For example, when the SCS is 15 kHz, it supports a wide area in traditional cellular bands; when the SCS is 30 kHz / 60 kHz, it supports dense-urban, lower latency, and wider carrier bandwidth; and when the SCS is 60 kHz or higher, it supports a bandwidth greater than 24.25 GHz to overcome phase noise.

[0067] The above numerology can be defined by the cycle prefix (CP) length and the subcarrier spacing (SCS). A single cell can provide multiple numerologies to the terminal. When the index of the numerology is denoted by μ, each subcarrier spacing and the corresponding CP length may be as shown in the table below.

[0068] μ△f=2 μ 15 [kHz]CP015General 130General 260General, Extended 3120General 4240General 5480General 6960General

[0069] For a standard CP, when the numerology index is denoted by μ, the number of OFDM symbols per slot (N slot symb ), number of slots per frame (N frame,μ slot ) And, the number of slots per subframe (N subframe,μ slot ) is as shown in the table below.

[0070] μ△f=2 μ 15 [kHz]N slot symb N frame,μ slot N subframe,μ slot 015141011301420226014404312014808424014160165480143203269601464064

[0071] For extended CP, when the numerology index is denoted by μ, the number of OFDM symbols per slot (N slot symb ), number of slots per frame (N frame,μ slot ) And, the number of slots per subframe (N subframe,μ slot ) is as shown in the table below.

[0072] μSCS (15*2 u )N slot symb N frame,μ slot N subframe,μslot 260KHz (u=2)12404

[0073] In an NR system, the OFDM(A) numerology (e.g., SCS, CP length, etc.) can be configured differently among multiple cells that are merged into a single terminal. Accordingly, the (absolute time) interval of a time resource (e.g., SF, slot, or TTI) (collectively referred to as TU (Time Unit) for convenience) composed of the same number of symbols can be configured differently among the merged cells.

[0074] FIGS. 3a to 3c are exemplary diagrams illustrating exemplary architectures for wireless communication services.

[0075] Referring to Fig. 3a, the UE is connected to an LTE / LTE-A based cell and an NR based cell in a DC (dual connectivity) manner.

[0076] The above NR-based cell is connected to the core network for existing 4th generation mobile communication, namely the EPC (Evolved Packet Core).

[0077] Referring to Fig. 3b, unlike Fig. 3a, the LTE / LTE-A based cell is connected to a core network for 5th generation mobile communication, that is, a 5G core network.

[0078] A service method based on the architecture as illustrated in Figures 3a and 3b above is called NSA (non-standalone).

[0079] Referring to Fig. 3c, the UE is connected only to NR-based cells. A service method based on this architecture is called SA (standalone).

[0080] Meanwhile, in the above NR, it may be considered that reception from the base station utilizes a downlink subframe, and transmission to the base station utilizes an uplink subframe. This method can be applied to paired spectra and unpaired spectra. A paired spectrum means that it includes two carrier spectra for downlink and uplink operations. For example, in a paired spectrum, one carrier may include a downlink band and an uplink band that are paired with each other.

[0081] Figure 4 illustrates the slot structure of an NR frame.

[0082] A slot contains multiple symbols in the time domain. For example, in the case of a standard CP, one slot contains 14 symbols, whereas in the case of an extended CP, one slot contains 12 symbols. A carrier contains multiple subcarriers in the frequency domain. A Resource Block (RB) is defined as multiple (e.g., 12) consecutive subcarriers in the frequency domain. A Bandwidth Part (BWP) is defined as multiple consecutive (physical, P)RBs in the frequency domain and can correspond to a single numerology (e.g., SCS, CP length, etc.). A terminal may be configured with up to N (e.g., 4) BWPs in both the downlink and uplink. Downlink or uplink transmission is performed through an active BWP, and at a given time, only one of the BWPs configured for the terminal may be active. In the resource grid, each element is referred to as a Resource Element (RE), and a single complex symbol may be mapped to it.

[0083] Figure 5 illustrates an example of a subframe type in NR.

[0084] The transmission time interval (TTI) illustrated in Fig. 5 can be referred to as a subframe or slot for NR (or new RAT). The subframe (or slot) of Fig. 5 can be used in the TDD system of NR (or new RAT) to minimize data transmission delay. As illustrated in Fig. 5, the subframe (or slot) contains 14 symbols. The symbols at the beginning of the subframe (or slot) can be used for the downlink (DL) control channel, and the symbols at the end of the subframe (or slot) can be used for the uplink (UL) control channel. The remaining symbols can be used for DL ​​data transmission or UL data transmission. According to this subframe (or slot) structure, downlink transmission and uplink transmission can proceed sequentially within a single subframe (or slot). Thus, downlink data can be received within the subframe (or slot), and uplink acknowledgments (ACK / NACK) can be transmitted within that subframe (or slot).

[0085] The structure of such a subframe (or slot) can be called a self-contained subframe (or slot).

[0086] Specifically, the first N symbols within the slot are used to transmit a DL control channel (hereinafter referred to as the DL control area), and the last M symbols within the slot may be used to transmit a UL control channel (hereinafter referred to as the UL control area). N and M are each integers greater than or equal to 0. A resource area (hereinafter referred to as the data area) located between the DL control area and the UL control area may be used for DL ​​data transmission or for UL data transmission. For example, a physical downlink control channel (PDCCH) may be transmitted in the DL control area, and a physical downlink shared channel (PDSCH) may be transmitted in the DL data area. A physical uplink control channel (PUCCH) may be transmitted in the UL control area, and a physical uplink shared channel (PUSCH) may be transmitted in the UL data area.

[0087] Using such a subframe (or slot) structure has the advantage of reducing the time required to retransmit data that has received errors, thereby minimizing the waiting time for final data transmission. In such a self-contained subframe (or slot) structure, a time gap may be required during the transition from transmit mode to receive mode or from receive mode to transmit mode. To this end, some OFDM symbols during the transition from DL to UL in the subframe structure may be set as a Guard Period (GP).

[0088] Figure 6 illustrates the structure of a self-contained slot.

[0089] In an NR system, a frame is characterized by a self-complete structure in which a DL control channel, DL or UL data, a UL control channel, etc., can all be included within a single slot. For example, the first N symbols within the slot are used to transmit a DL control channel (hereinafter referred to as the DL control area), and the last M symbols within the slot may be used to transmit a UL control channel (hereinafter referred to as the UL control area). N and M are each integers greater than or equal to 0. The resource area (hereinafter referred to as the data area) located between the DL control area and the UL control area may be used for transmitting DL data or for transmitting UL data. As an example, the following configuration can be considered. Each section is listed in chronological order.

[0090] 1. DL only configuration

[0091] 2. UL only configuration

[0092] 3. Mixed UL-DL Configuration

[0093] - DL Area + GP (Guard Period) + UL Control Area

[0094] - DL Control Area + GP + UL Area

[0095] DL Area: (i) DL Data Area, (ii) DL Control Area + DL Data Area

[0096] UL Area: (i) UL Data Area, (ii) UL Data Area + UL Control Area

[0097] PDCCH can be transmitted in the DL control area, and PDSCH can be transmitted in the DL data area. PUCCH can be transmitted in the UL control area, and PUSCH can be transmitted in the UL data area. In PDCCH, DCI (Downlink Control Information), such as DL data scheduling information and UL data scheduling information, can be transmitted. In PUCCH, UCI (Uplink Control Information), such as ACK / NACK (Positive Acknowledgement / Negative Acknowledgement) information for DL ​​data, CSI (Channel State Information) information, and SR (Scheduling Request), can be transmitted. GP provides a time gap during the process in which the base station and the terminal switch from transmit mode to receive mode or from receive mode to transmit mode. Within a subframe, some symbols at the point of transition from DL to UL can be set as GP.

[0098] Figure 7 shows an example of an Access Stratum (AS) procedure between an ambient IoT device and a reader.

[0099] Referring to FIG. 7, the overall Access Stratum (AS) procedure between an ambient IoT (A-IoT) device and a reader is described below.

[0100] Step A: A-IoT Paging (S701)

[0101] The reader transmits an A-IoT paging message indicating the device requiring a response in response to the service request. Here, the A-IoT paging message can be used interchangeably with the initial trigger message.

[0102] Step B: D2R (Device-to-Reader) data transfer (S702~S703)

[0103] An A-IoT device triggered by paging can transmit a device identifier (ID) to the reader, either by performing an A-IoT random access procedure or without such procedure. Subsequently, D2R data is transmitted to the reader.

[0104] Step C1: R2D (Reader-to-Device) data transfer (S704)

[0105] Optionally, the reader can transmit data including commands, etc. to the device.

[0106] Step C2: D2R data transmission (S705)

[0107] Optionally, the device can transmit response data to the above command to the reader.

[0108] These procedures can support the following A-IoT use cases:

[0109] Inventory-only: Can be supported through a procedure consisting of Step A and Step B.

[0110] Inventory and command: This can be supported through a procedure including steps A, B, C1, and C2. Here, this does not mean that the A-IoT paging message includes both inventory and command simultaneously, nor does it mean that the reader receives both inventory and command simultaneously from the upper layer.

[0111] Command-only: Basically, this can be supported through a procedure consisting of steps A, B, C1, and C2, and the following alternative procedures may also be considered.

[0112] Step A: The reader can send an A-IoT paging message containing a command to a device to instruct the device to process the command and respond.

[0113] Step C2: The device transmits device ID or response data for the command; this process may be performed through an A-IoT random access procedure or without such procedure.

[0114] 3GPP decided to study use cases and scenarios for battery-less or energy-harvesting IoT devices, and to research technologies to support IoT devices with higher requirements that cannot be met by existing IoT technologies. The study phase for this purpose began in Release 19.

[0115] The present invention proposes a method for establishing a contention resource based on a multiple access method in the time and frequency domain for an Internet of Things device transmitting data in a Slotted Aloha manner, and for efficiently receiving Message 2 (Message 2, MSG2) when one or more Internet of Things device(s) transmit Message 1 (Message 1, MSG1) in different time / frequency domains of the same slot resource.

[0116] Meanwhile, for convenience of explanation, the ambient IoT device may be referred to as an ambient IoT terminal, IoT device, IoT terminal, device, apparatus, or terminal in this specification.

[0117] In addition, the channel transmitted from the device to the reader can be defined as PDRCH (Physical Device to Reader Channel) and the channel transmitted from the reader to the device can be defined as PRDCH (Physical Reader to Device Channel), and the device's uplink transmission can be named D2R transmission and the reader's downlink transmission can be named R2D transmission.

[0118] Currently, 3GPP has decided to base the data transmission method for A(ambient)-IoT devices on slotted aloha. Slotted aloha is a method in which data transmission is attempted from the beginning of a slot based on one or more slots, and a collision occurs if one or more devices transmit data simultaneously in the same slot. In this case, the device that detects the collision selects one of the next slots to retry data transmission.

[0119] In addition, 3GPP is considering setting up one or more RO (Random Access Channel Occasions) within a single slot to increase resource efficiency. That is, it provides multiple access methods in the frequency domain as well as resources in the time domain. This means that an A-IoT device can set up i*j distinct access occasions using i time resources and j frequency resources within a single time slot resource area, and can select a competing resource based on time and frequency resources.

[0120] Accordingly, the reader can receive multiple messages 1 (MSG1) from multiple A-IoT devices within a single slot, and in response, considers two options for sending messages 2 (MSG2) as described below, and decided to study the MSG2 monitoring time interval according to each option and MSG2 transmission method.

[0121] According to the discussions held so far, it was decided that A-IoT devices supported by 3GPP can establish contention resources for MSG1 transmission by considering not only TDMA (Time Division Multiple Access) but also FDMA (Frequency Division Multiple Access), and that a data transmission and reception method based on this will be studied. If, within a single time slot, a total of i*j access occasions are established through i time resources and j frequency resources, a reader that receives two or more MSG1s distinguished by different time / frequency resources can transmit up to i*j different MSG2s in response.

[0122] FIGS. 8a and 8b are drawings illustrating message 2 transmission option 1 for ambient IoT devices.

[0123] Currently, 3GPP has decided to study transmission methods for MSG2, which are transmitted in response to MSG1s classified into the aforementioned i*j different resources, by dividing them into two main options. First, based on discussions to date, R2D has decided to adopt TDM-based message transmission as the baseline. Based on this, when individual MSG2s are transmitted in response to multiple MSG1s, the reader can transmit up to i*j MSG2s for up to i*j received MSG1s either continuously or discontinuously. Figures 8a and 8b illustrate examples of such transmission. Figure 8a illustrates an example of MSG3 reception following continuous MSG2 transmission, and Figure 8b illustrates an example of MSG3 reception following a single MSG2 transmission.

[0124] Referring to FIGS. 8a and 8b, devices attempting Random Access (RA) in any slot randomly select one of a total of six Random Access Channel (RO) Occasions (RACH). If each device successfully occupies one of the six ROs without collision and transmits MSG1, the reader can continuously transmit MSG2 for each MSG1. However, specific methods for transmitting MSG2 and monitoring it have not yet been determined. As shown in FIG. 8a, devices that have transmitted MSG1 may have individual MSG2 monitoring intervals set according to the RO they have selected, or they may expect to receive MSG2 containing a response to the MSG1 they transmitted during a single MSG2 monitoring interval for all ROs. If they do not receive MSG2 corresponding to the transmitted MSG1 within the set interval, the device that transmitted MSG1 determines that the RA has failed.

[0125] FIG. 9 is a diagram illustrating message 2 transmission option 2 for an ambient IoT device.

[0126] Figure 9 is an example of MSG2 transmission option 2. As shown in Figure 9, a single MSG2 contains responses to multiple MSG1s. Devices that transmitted MSG1 can verify whether resource occupancy was successful through a single MSG2. For this purpose, a single MSG2 monitoring duration is set for all devices based on the time required to process the MSG2 containing responses to all ROs.

[0127] The MSG2 monitoring interval described above can be increased based on the number of devices that have selected an RO within a slot or the number of devices that have successfully transmitted an MSG1. As the number of ROs increases, unnecessary devices may monitor MSG2 for a longer period of time, or unnecessary monitoring intervals may occur. For example, in the case of Option 1, MSG2 monitoring can be performed only in the associated interval where multiple MSG2s can be transmitted to receive MSG2s corresponding to the MSG1 transmitted by the devices that have transmitted MSG1, in order to save energy. However, since this is equivalent to pre-occupying time resources for MSG2 equal to the number of ROs (i*j) within a slot, if a response message is not sent, that amount of time resources is wasted.

[0128] FIGS. 10a and 10b are another diagram illustrating message 2 transmission option 1 for an ambient IoT device.

[0129] FIG. 10a shows an example of MSG3 reception following continuous MSG2 transmission, and FIG. 10b shows an example of MSG3 reception following a single MSG2 transmission.

[0130] Referring to FIGS. 10a and 10b, in the case of an idle RO that is not selected by any device or a collision RO selected by one or more devices, the MSG2 monitoring section must be occupied in advance to inform the devices whether the MSG1 transmission failed, even though the MSG2 for the RO is not transmitted, which may result in unnecessary waste of wireless resources.

[0131] In addition, devices that have transmitted MSG1 must decode the PRDCH received during the MSG2 monitoring period for multiple MSG2s in order to receive response messages for the MSG1 they have transmitted. Even if only the designated MSG2 monitoring period corresponding to the RO that transmitted MSG1 is monitored, the device consumes power by staying awake for a long period of time expecting to receive MSG2.

[0132] Therefore, it is necessary to define an MSG 2 transmission and reception method to efficiently use overall system resources and minimize the power consumption of the device.

[0133] The present invention proposes defining an EI field composed of early indication (EI) information to inform devices in advance whether to transmit MSG2 that may be transmitted in response to an MSG1 transmitted through one of a total of n connection opportunity resources, which are classified into x time resources and y frequency resources, when an A-IoT device that has received at least one competitive resource within any slot transmits MSG1.

[0134] FIG. 11 is a flowchart illustrating a method of operation of a terminal according to one embodiment of the present specification.

[0135] Referring to FIG. 11, a terminal (i.e., a device) receives PRDCH from a reader (e.g., a base station) containing information on at least one contention resource (RO) separated into time / frequency domains (S1101). Subsequently, the terminal transmits Message 1 (MSG1) through one selected RO based on the received information (S1102).

[0136] When the terminal receives a PRDCH containing indicator information indicating that message 2 (MSG2) corresponding to the selected RO from the reader is not transmitted (S1103), it considers it a Random Access (RA) failure and stops monitoring message 2 (S1104).

[0137] FIGS. 12a and 12b are drawings for explaining the monitoring and reception of message 2 according to one embodiment of the present specification.

[0138] More specifically, the present invention proposes that an Early Indication (EI) bitmap configured in the order of time / frequency resources for n ROs set within any slot be included and transmitted within the first PRDCH that transmits MSG2 or within a PRDCH separate from MSG2. The EI bitmap may have a length equal to the number of ROs within the slot, and may indicate that MSG2 transmission for the corresponding RO will not be performed by indicating 1 when MSG2 corresponding to MSG1 transmitted to the i-th RO is transmitted, and by indicating 0 when the transmission of MSG1 transmitted to the i-th RO fails (collision RO) or when no terminal transmits MSG1 to the corresponding RO (idle RO).

[0139] Referring to FIGS. 12a and 12b, the first message containing the EI field may be defined and transmitted separately from the MSG2 transmitted as a response to MSG1 via the common PRDCH, or it may be included and transmitted as the first control information of the PRDCH for the MSG2 transmitted first among the MSG2(s) transmitted as a response to MSG1. If the EI field is transmitted through the first MSG2 among multiple MSG2s that can be transmitted for multiple MSG1s, it is preferable that the EI (Early Indication) information defined in the present invention be defined to be positioned preferentially over other information (for example, the RN (Random Number) received from MSG1 or resource allocation information for MSG3, etc., as response message information for multiple MSG1s) as the PHY (physical) or upper-layer MAC (medium access control) control information of the MSG2. That is, it means that the EI (Early Indication) field may be included in "Message 2 for RO #0 (MSG2 for RO #0)" in FIG. 12a or "Message 2 for RO #0, #4, #5 (MSG2 for RO #0, #4, #5)" in FIG. 12b.

[0140] FIGS. 13a and 13b illustrate procedures for a reader and a terminal according to an embodiment of the present specification.

[0141] Figure 13a shows RA success through 2-step MSG2 monitoring, and Figure 13b shows RA failure through 2-step MSG2 monitoring.

[0142] The present invention proposes a two-step monitoring method for setting the MSG2 monitoring period for devices that have transmitted MSG1. More specifically, the device operating in the present invention defines a divided EI monitoring period (EI monitoring duration) for monitoring the PRDCH containing the proposed EI field and a Message 2 monitoring period (MSG2 monitoring duration) for monitoring the actual MSG2 based on the instructions of the corresponding EI field, and all devices that have transmitted MSG1 are required to prioritize monitoring the PRDCH containing the EI field during the EI monitoring period (EI monitoring duration). To this end, it is preferable that the PRDCH containing the EI field be transmitted via the very first message for MSG2 transmission, and the device(s) that have selected the RO of the corresponding slot set the time period (time duration) for EI monitoring starting from the time corresponding to the last resource for the RO for MSG1 set within the slot. That is, if one or more ROs exist, T based on the time resource for the last RO among the set ROs D2R_min From then on T D2R_max This means that the time interval up to can be defined as the PRDCH monitoring period including the EI field. The PRDCH monitoring period including the EI field (PRDCH monitoring duration) is set by the reader by including it in the PRDCH that triggers the RA (for example, a message containing RO resource information for MSG1, such as a slot trigger, paging, or access trigger message), is defined as a fixed value within the standard specification, or is a default T set / defined by the message / standard specification. D2R_min or T D2R_max Based on this, the time interval for EI monitoring can be defined so that the device calculates the time interval.

[0143] Hereinafter, the operation of an A-IoT device (i.e., a terminal) will be described in detail with reference to FIGS. 13a and 13b.

[0144] 1. An A-IoT device receives a PRDCH containing at least one of the following information.

[0145] Contested resource information for MSG1 transmission. Here, the contested resource information may include time / frequency resource information (n) for one or more ROs. Additionally, each RO may have an index according to time / frequency order.

[0146] Monitoring interval information for the EI field. Here, the monitoring interval information is [T D2R_min , T D2R_max It can be expressed as ]

[0147] 2. The A-IoT device randomly selects one RO based on resource information regarding the received RO.

[0148] 3. The A-IoT device transmits MSG1 to the selected RO.

[0149] 4. The A-IoT device receives a PRDCH containing an EI field within an EI monitoring interval based on resource information regarding the received RO.

[0150] If the EI bit corresponding to the selected RO is set to 1, the device receives MSG2 transmitted within the MSG2 monitoring interval. Upon receiving MSG2 containing the RN transmitted from MSG1, the device transmits MSG3 through the resources allocated or predefined in MSG2. Subsequently, the device may (optionally) receive MSG4 indicating a successful transmission of MSG3. Afterward, the device considers the RA to be successful.

[0151] If the EI bit corresponding to the selected RO is set to 0, the RA is considered to have failed and MSG2 monitoring is stopped (Fig. 13b). Here, an RA failure may mean triggering an RA retry, waiting for the next paging, or increasing the RA transmission count by 1.

[0152] Hereinafter, the operation of a reader (e.g., a base station) will be described in detail with reference to FIGS. 13a and 13b.

[0153] 1. The reader transmits a PRDCH containing at least one of the following information.

[0154] Contested resource information for MSG1 transmission. Here, the contested resource information may include time / frequency resource information (n) for one or more ROs. Additionally, each RO may have an index according to time / frequency order.

[0155] Monitoring interval information for the EI field. Here, the monitoring interval information is [T D2R_min , T D2R_max It can be expressed as ]

[0156] 2. Receive MSG1(s) with any RO.

[0157] 3. Transmit PRDCH with an n-bit length EI field constructed based on the received MSG1. The EI field can be constructed as follows.

[0158] If MSG1 corresponding to any RO is successfully received, the EI bit corresponding to that RO is set to 1.

[0159] If reception of MSG1 corresponding to any RO fails (collision RO or idle RO), the EI bit corresponding to that RO is set to 0.

[0160] 4. Transmit MSG2(s) corresponding to the RO indicated by the EI field as 1 within the MSG2 monitoring interval.

[0161] 5. Receive MSG3 corresponding to the transmitted MSG2.

[0162] 6. (Optionally) MSG4 can be sent in response to MSG3.

[0163] 7. For devices that have successfully received MSG3, RA is considered to have been successfully performed.

[0164] Meanwhile, as previously described, the EI field can be included within the first MSG2 among the transmitted MSG2s. This means that if one or more MSG2s for one or more ROs configured within a slot are transmitted, the EI field is included within the PRDCH transmitting the MSG2 for the MSG1 / RO indicated first among the EI fields. In this way, if the EI field is included within the MSG2 and only one MSG2 for multiple ROs is transmitted, MSG2 reception can be terminated by EI monitoring alone. In other words, if only one MSG2 for multiple ROs is transmitted (in the case of MSG2 transmission Option 2, or in the case of Option 1 where only one MSG1 is successfully received), it means that EI monitoring and MSG2 monitoring can simultaneously monitor not only the EI but also the MSG2 through a single, identical monitoring interval.

[0165] It is obvious that if the EI field proposed in the present invention is defined, and the field is interpreted with the same meaning even if it is transmitted through a message other than the previously defined message, it can be understood as the same technology.

[0166] FIGS. 14a and 14b illustrate procedures for a reader and a terminal according to another embodiment of the present specification.

[0167] Figures 14a and 14b show examples of RA failure in EI PRDCH monitoring.

[0168] A method for receiving the EI field is described in the case where no MSG2 is transmitted in response to an MSG1 transmitted to one or more ROs set within a single slot. In this case, the reader may not transmit a PRDCH containing the EI field (Fig. 14a), or transmit only a PRDCH in which all bits of the EI field are set to 0 (Fig. 14b). Referring to Fig. 14a, the device(s) that did not receive the PRDCH transmitted during the EI monitoring period recognize that the reader did not successfully receive the MSG1 they transmitted (MSG1 transmission failure or resource occupancy failure), and consider the RA to have failed when the EI monitoring period ends. Referring to Fig. 14b, the device recognizes that the MSG1 transmission failed through an indicator of the bit corresponding to the RO selected by the device, and as soon as it confirms the indicator, stops MSG2 monitoring and considers the RA to have failed.

[0169] Although the present invention is based on a 3-step RA (4-step RA if MSG4 is defined), it can be equally applied to the transmission and reception of MSG2 to MSG1 of a 2-step RA and the transmission and reception of MSG2 of a contention-free RA.

[0170] The disclosures of this specification described above may be implemented through various means. For example, the disclosures of this specification may be implemented by hardware, firmware, software, or a combination thereof. Specifically, they will be described below with reference to the drawings.

[0171] FIG. 15 shows an apparatus according to one embodiment of the present specification.

[0172] Referring to FIG. 15, the wireless communication system may include a first device (100a) and a second device (100b).

[0173] The first device (100a) may be a base station, network node, transmission terminal, receiving terminal, wireless device, wireless communication device, vehicle, vehicle equipped with autonomous driving function, connected car, drone (Unmanned Aerial Vehicle, UAV), AI (Artificial Intelligence) module, robot, AR (Augmented Reality) device, VR (Virtual Reality) device, MR (Mixed Reality) device, hologram device, public safety device, MTC device, IoT device, medical device, fintech device (or financial device), security device, climate / environment device, device related to 5G service, or other device related to the field of the Fourth Industrial Revolution.

[0174] The second device (100b) may be a base station, network node, transmission terminal, receiving terminal, wireless device, wireless communication device, vehicle, vehicle equipped with autonomous driving function, connected car, drone (Unmanned Aerial Vehicle, UAV), AI (Artificial Intelligence) module, robot, AR (Augmented Reality) device, VR (Virtual Reality) device, MR (Mixed Reality) device, hologram device, public safety device, MTC device, IoT device, medical device, fintech device (or financial device), security device, climate / environment device, device related to 5G service, or other device related to the field of the Fourth Industrial Revolution.

[0175] The first device (100a) may include at least one processor, such as a processor (1020a), at least one memory, such as a memory (1010a), and at least one transceiver, such as a transceiver (1031a). The processor (1020a) may perform the aforementioned functions, procedures, and / or methods. The processor (1020a) may perform one or more protocols. For example, the processor (1020a) may perform one or more layers of a wireless interface protocol. The memory (1010a) is connected to the processor (1020a) and may store various forms of information and / or commands. The transceiver (1031a) is connected to the processor (1020a) and may be controlled to transmit and receive wireless signals.

[0176] The second device (100b) may include at least one processor, such as a processor (1020b), at least one memory device, such as a memory (1010b), and at least one transceiver, such as a transceiver (1031b). The processor (1020b) may perform the aforementioned functions, procedures, and / or methods. The processor (1020b) may implement one or more protocols. For example, the processor (1020b) may implement one or more layers of a wireless interface protocol. The memory (1010b) is connected to the processor (1020b) and may store various forms of information and / or commands. The transceiver (1031b) is connected to the processor (1020b) and may be controlled to transmit and receive wireless signals.

[0177] The memory (1010a) and / or the memory (1010b) may be connected to the processor (1020a) and / or the processor (1020b) respectively, either internally or externally, and may also be connected to other processors through various technologies such as wired or wireless connections.

[0178] The first device (100a) and / or the second device (100b) may have one or more antennas. For example, the antenna (1036a) and / or antenna (1036b) may be configured to transmit and receive wireless signals.

[0179] FIG. 16 is a block diagram showing the configuration of a terminal according to one embodiment of the present specification.

[0180] In particular, FIG. 16 is a drawing illustrating the device of FIG. 15 in more detail.

[0181] The device includes a memory (1010), a processor (1020), a transceiver (1031), a power management module (1091), a battery (1092), a display (1041), an input unit (1053), a speaker (1042) and a microphone (1052), a SIM (subscriber identification module) card, and one or more antennas.

[0182] The processor (1020) may be configured to implement the proposed functions, procedures, and / or methods described herein. Layers of a radio interface protocol may be implemented in the processor (1020). The processor (1020) may include an application-specific integrated circuit (ASIC), other chipsets, logic circuits, and / or data processing devices. The processor (1020) may be an application processor (AP). The processor (1020) may include at least one of a digital signal processor (DSP), a central processing unit (CPU), a graphics processing unit (GPU), and a modem (modulator and demodulator). Examples of processors (1020) may be SNAPDRAGON™ series processors manufactured by Qualcomm®, EXYNOSTM series processors manufactured by Samsung®, A series processors manufactured by Apple®, HELIO™ series processors manufactured by MediaTek®, ATOM™ series processors manufactured by INTEL®, KIRINTM series processors manufactured by HiSilicon®, or corresponding next-generation processors.

[0183] The power management module (1091) manages power for the processor (1020) and / or the transceiver (1031). The battery (1092) supplies power to the power management module (1091). The display (1041) outputs the results processed by the processor (1020). The input unit (1053) receives input to be used by the processor (1020). The input unit (1053) may be displayed on the display (1041). A SIM card is an integrated circuit used to securely store the International Mobile Subscriber Identity (IMSI) and associated keys used to identify and authenticate a subscriber in mobile devices such as mobile phones and computers. Contact information may also be stored on many SIM cards.

[0184] Memory (1010) is operably coupled with the processor (1020) and stores various information for operating the processor (610). Memory (1010) may include ROM (read-only memory), RAM (random access memory), flash memory, memory card, storage medium and / or other storage device. Where the embodiment is implemented in software, the techniques described herein may be implemented as modules (e.g., procedures, functions, etc.) that perform the functions described herein. Modules may be stored in memory (1010) and executed by the processor (1020). Memory (1010) may be implemented inside the processor (1020). Alternatively, memory (1010) may be implemented outside the processor (1020) and may be communically connected to the processor (1020) through various means known in the art.

[0185] The transceiver (1031) is operably coupled with the processor (1020) and transmits and / or receives a wireless signal. The transceiver (1031) includes a transmitter and a receiver. The transceiver (1031) may include a baseband circuit for processing a wireless frequency signal. The transceiver controls one or more antennas to transmit and / or receive a wireless signal. The processor (1020) transmits command information to the transceiver (1031) to transmit a wireless signal, for example, constituting voice communication data, in order to initiate communication. The antennas function to transmit and receive wireless signals. When receiving a wireless signal, the transceiver (1031) may transmit the signal to the processor (1020) for processing and convert the signal to baseband. The processed signal may be converted into audible or readable information output through a speaker (1042).

[0186] The speaker (1042) outputs sound-related results processed by the processor (1020). The microphone (1052) receives sound-related input to be used by the processor (1020).

[0187] The user inputs command information, such as a phone number, by, for example, pressing (or touching) a button on the input unit (1053) or by voice activation using the microphone (1052). The processor (1020) receives this command information and processes it to perform appropriate functions, such as making a call to the phone number. Operational data can be extracted from a SIM card or memory (1010). Additionally, the processor (1020) can display the command information or operation information on the display (1041) for the user's awareness and convenience.

[0188] FIG. 17 shows a block diagram of a processor in which the disclosure of the present specification is implemented.

[0189] As can be seen with reference to FIG. 17, a processor (1020) in which the disclosure of this specification is implemented may include a plurality of circuits to implement the proposed functions, procedures and / or methods described in this specification. For example, the processor (1020) may include a first circuit (1020-1), a second circuit (1020-2), and a third circuit (1020-3). Additionally, although not illustrated, the processor (1020) may include more circuits. Each circuit may include a plurality of transistors.

[0190] The above processor (1020) may be called an ASIC (application-specific integrated circuit) or an AP (application processor), and may include at least one of a DSP (digital signal processor), a CPU (central processing unit), and a GPU (graphics processing unit).

[0191] FIG. 18 is a block diagram showing in detail the transceiver of the first device shown in FIG. 15 or the transceiver of the device shown in FIG. 16.

[0192] Referring to FIG. 18, the transceiver unit (1031) includes a transmitter (1031-1) and a receiver (1031-2). The transmitter (1031-1) includes a Discrete Fourier Transform (DFT) unit (1031-11), a subcarrier mapper (1031-12), an IFFT unit (1031-13), a CP insertion unit (1031-14), and a wireless transmitter (1031-15). The transmitter (1031-1) may further include a modulator. Additionally, it may further include, for example, a scramble unit (not shown), a modulation mapper (not shown), a layer mapper (not shown), and a layer permutator (not shown), which may be positioned prior to the DFT unit (1031-11). That is, to prevent an increase in the PAPR (peak-to-average power ratio), the transmitter (1031-1) first passes the information through the DFT (1031-11) before mapping the signal to the subcarrier. After the signal spread (or precoded in the same sense) by the DFT section (1031-11) is mapped to the subcarrier through the subcarrier mapper (1031-12), it is then passed through the IFFT (Inverse Fast Fourier Transform) section (1031-13) to form a signal on the time axis.

[0193] The DFT unit (1031-11) performs a DFT on the input symbols to output complex-valued symbols. For example, if Ntx symbols are input (where Ntx is a natural number), the DFT size is Ntx. The DFT unit (1031-11) may be called a transform precoder. The subcarrier mapper (1031-12) maps the complex-valued symbols to each subcarrier in the frequency domain. The complex-valued symbols may be mapped to resource elements corresponding to resource blocks allocated for data transmission. The subcarrier mapper (1031-12) may be called a resource element mapper. The IFFT unit (1031-13) performs an IFFT on the input symbols to output a baseband signal for the data, which is a time-domain signal. The CP insertion section (1031-14) copies a portion of the latter part of the base band signal for data and inserts it into the front part of the base band signal for data. Through CP insertion, Inter-Symbol Interference (ISI) and Inter-Carrier Interference (ICI) are prevented, so that orthogonality can be maintained even in a multipath channel.

[0194] On the other hand, the receiver (1031-2) includes a wireless receiver (1031-21), a CP removal unit (1031-22), an FFT unit (1031-23), and an equalization unit (1031-24), etc. The wireless receiver (1031-21), CP removal unit (1031-22), and FFT unit (1031-23) of the receiver (1031-2) perform the inverse functions of the wireless transmitter (1031-15), CP insertion unit (1031-14), and IFF unit (1031-13) of the transmitter (1031-1). The receiver (1031-2) may further include a demodulator.

[0195] Although preferred embodiments have been described by way of example above, the disclosure of this specification is not limited to such specific embodiments, and may be modified, changed, or improved in various forms within the scope of the spirit and claims of this specification.

[0196] In the exemplary system described above, methods are described based on a flowchart as a series of steps or blocks, but are not limited to the order of the described steps, and some steps may occur in a different order or simultaneously with other steps as described above. Furthermore, a person skilled in the art will understand that the steps shown in the flowchart are not exclusive, and that other steps may be included, or that one or more steps of the flowchart may be omitted without affecting the scope of rights.

[0197] The claims described in this specification may be combined in various ways. For example, the technical features of the method claims in this specification may be combined to be implemented as a device, and the technical features of the device claims in this specification may be combined to be implemented as a method. Furthermore, the technical features of the method claims and the technical features of the device claims in this specification may be combined to be implemented as a device, and the technical features of the method claims and the technical features of the device claims in this specification may be combined to be implemented as a method.

Claims

1. In a method of operation of a terminal in a wireless communication system, A step of receiving competitive resource information for at least one resource divided into time and frequency domains; A step of selecting a specific resource based on the received competitive resource information; A step of transmitting a first message through the selected specific resource; and After transmitting the first message, the method includes the step of receiving PRDCH (Physical Reader to Device Channel), and A method in which the transmission of a second message, which is a response to the first message, is indicated through the above PRDCH.

2. In Paragraph 1, A method in which the transmission of the second message is indicated through the EI (Early Indication) field.

3. In Paragraph 2, The above EI field is in the form of a bitmap, a method.

4. In Paragraph 2, A method in which the transmission of the second message is indicated within the monitoring interval for the EI field.

5. In Paragraph 2, A method further comprising the step of receiving monitoring interval information for the above EI field.

6. In Paragraph 1, A method in which the specific resource above is an RO (RACH (Random Access Channel) Occasion) randomly selected from at least one of the above resources.

7. In a method of operation of a reader in a wireless communication system, A step of transmitting competitive resource information for at least one resource divided into time and frequency domains; After transmitting the above competitive resource information, the step of receiving a first message through a specific resource; and After receiving the first message, the method includes the step of transmitting PRDCH (Physical Reader to Device Channel), A method in which the transmission of a second message, which is a response to the first message, is indicated through the above PRDCH.

8. In Paragraph 7, A method in which the transmission of the second message is indicated through the EI (Early Indication) field.

9. In Paragraph 8, The above EI field is in the form of a bitmap, a method.

10. In Paragraph 8, A method in which the transmission of the second message is indicated within the monitoring interval for the EI field.

11. In Paragraph 8, A method further comprising the step of transmitting monitoring interval information for the above EI field.

12. In Paragraph 7, A method in which the specific resource above is an RO (RACH (Random Access Channel) Occasion) randomly selected from at least one of the above resources.

13. As a terminal in a wireless communication system, At least one processor; and The operation performed based on the instruction being executed by the at least one processor includes at least one memory that stores instructions and is operablely electrically connected to the at least one processor: The step of receiving competitive resource information for at least one resource divided into time and frequency domains, and A step of selecting a specific resource based on the received competitive resource information, and The step of transmitting a first message through the selected specific resource above, and, After transmitting the first message, the method includes the step of receiving PRDCH (Physical Reader to Device Channel), and A terminal in which the transmission of a second message, which is a response to the first message, is indicated via the PRDCH.

14. In Paragraph 13, A terminal in which the transmission of the second message is indicated through the EI (Early Indication) field.

15. In Paragraph 14, The above EI field is a terminal in the form of a bitmap.

16. In Paragraph 14, A terminal in which the transmission of the second message is indicated within the monitoring interval for the EI field.

17. In Paragraph 14, Based on the execution of the above instruction by the at least one processor, the operation performed is: A terminal further comprising the step of receiving monitoring interval information for the above EI field.

18. In Paragraph 13, The above specific resource is a terminal that is an RO (RACH (Random Access Channel) Occasion) arbitrarily selected from at least one of the above resources.

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