Wireless base station and terminal

Abstract

This terminal simultaneously applies inter-slot frequency hopping and intra-slot frequency hopping to the transmission of a message in a random access channel procedure. The terminal repeatedly transmits the message.

Description

Wireless base station and terminal

[0001] The present disclosure relates to a radio base station and a terminal that support message repetition in a random access channel procedure.

[0002] The 3rd Generation Partnership Project (3GPP) is developing specifications for the 5th generation mobile communication system (5G, also known as New Radio (NR) or Next Generation (NG)), and is also developing specifications for the next generation, known as Beyond 5G, 5G Evolution, or 6G.

[0003] For example, in 3GPP Release-17, a work item on Coverage Enhancement (CE) in NR has been agreed upon (Non-Patent Document 1).

[0004] Specifically, studies are underway on the specifications for repetition of an uplink data channel (Physical Uplink Shared Channel: PUSCH) used to transmit a message (Msg3) in a random access channel (Random Access Channel: RACH) procedure.

[0005] "New WID on NR coverage enhancements", RP-202928, 3GPP TSG RAN meeting #90e, 3GPP, December 2020

[0006] Although Msg3 has specifications for retransmission, there is thought to be room for improvement in the method of determining the repetition and terminal (User Equipment, UE) in the retransmission.

[0007] Therefore, the following disclosure has been made in consideration of the above circumstances, and aims to provide a radio base station and a terminal that can further improve the performance regarding repetition of the message (Msg3) of the RACH procedure.

[0008] One aspect of the present disclosure is a radio base station (gNB100) that includes a receiving unit (radio signal transmitting / receiving unit 210) that receives messages in a random access channel procedure from a first type terminal and a second type terminal, and a control unit (control unit 270) that determines whether the terminal is the first type or the second type based on the messages.

[0009] One aspect of the present disclosure is a terminal (UE 200) that includes a control unit (control unit 270) that simultaneously applies inter-slot frequency hopping and intra-slot frequency hopping to the transmission of a message in a random access channel procedure, and a transmission unit (radio signal transceiver unit 210) that repeatedly transmits the message.

[0010] FIG. 1 is a diagram illustrating an overall schematic configuration of a wireless communication system 10. FIG. 2 is a diagram illustrating an example configuration of a radio frame, a subframe, and a slot used in the wireless communication system 10. FIG. 3 is a functional block diagram of a gNB 100 and a UE 200. FIG. 4 is a diagram illustrating an example of a random access sequence including repetition of Msg3. FIG. 5 is a diagram illustrating an example of a random access sequence including initial transmission and retransmission of Msg3. FIG. 6 is a diagram illustrating an example of a random access sequence according to Operation Example 1. FIG. 7 is a diagram illustrating an example of an Msg3 transmission operation flow according to Operation Example 1 (Alt2-Opt2). FIG. 8 is a diagram illustrating an example of allocation of RACH occasions according to Operation Example 1 (Alt3-Opt2, 3). FIG. 9 is a diagram illustrating an example of simultaneous application of inter-slot frequency hopping and intra-slot frequency hopping of Msg3 according to Operation Example 2. FIG. 10 is a diagram illustrating an example of application of a frequency offset according to Operation Example 2 (Case 1). Fig. 11 is a diagram showing an example of slot allocation of Msg3 according to Operation Example 3. Fig. 12 is a diagram showing an example of the configuration of MAC RAR according to Operation Example 3. Fig. 13 is a diagram showing an example of the hardware configuration of the gNB100 and the UE200.

[0011] Hereinafter, embodiments will be described with reference to the drawings. Note that the same or similar reference numerals are used to designate the same functions or configurations, and descriptions thereof will be omitted as appropriate.

[0012] (1) Overall Schematic Configuration of Wireless Communication System Fig. 1 is a diagram showing the overall schematic configuration of a wireless communication system 10 according to this embodiment. The wireless communication system 10 is a wireless communication system conforming to 5G New Radio (NR) and includes a Next Generation-Radio Access Network 20 (hereinafter, NG-RAN 20) and a terminal 200 (User Equipment 200, hereinafter, UE 200).

[0013] The wireless communication system 10 may be a wireless communication system conforming to a system called Beyond 5G, 5G Evolution, or 6G.

[0014] The NG-RAN 20 includes a radio base station 100 (hereinafter, gNB 100). Note that the specific configuration of the radio communication system 10, including the number of gNBs and UEs, is not limited to the example shown in FIG. 1 .

[0015] The NG-RAN 20 actually includes a plurality of NG-RAN nodes, specifically, gNBs (or ng-eNBs), and is connected to a 5G core network (5GC, not shown). The NG-RAN 20 and the 5GC may also be simply referred to as a "network."

[0016] The gNB100 is a radio base station that complies with NR and performs NR-compliant radio communication with the UE 200. The gNB100 and UE 200 are capable of supporting Massive MIMO, which generates a more directional beam (BM) by controlling radio signals transmitted from multiple antenna elements, Carrier Aggregation (CA), which aggregates multiple component carriers (CCs), and Dual Connectivity (DC), which simultaneously communicates between the UE and multiple NG-RAN nodes.

[0017] The wireless communication system 10 supports FR1 and FR2. The frequency bands of each FR (Frequency Range) are as follows:

[0018] FR1: 410 MHz to 7.125 GHz FR2: 24.25 GHz to 52.6 GHz FR1 may use a Sub-Carrier Spacing (SCS) of 15, 30, or 60 kHz, and a bandwidth (BW) of 5 to 100 MHz. FR2 is a higher frequency than FR1, and may use an SCS of 60 or 120 kHz (including 240 kHz), and a bandwidth (BW) of 50 to 400 MHz.

[0019] Furthermore, the wireless communication system 10 may also support frequency bands higher than the FR2 frequency band. Specifically, the wireless communication system 10 may support frequency bands above 52.6 GHz up to 114.25 GHz.

[0020] Alternatively, Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform - Spread (DFT-S-OFDM) with a larger Sub-Carrier Spacing (SCS) may be applied, and DFT-S-OFDM may be applied not only to the uplink (UL) but also to the downlink (DL).

[0021] FIG. 2 shows an example of the configuration of radio frames, subframes, and slots used in the radio communication system 10.

[0022] As shown in Figure 2, one slot consists of 14 symbols, and the larger (wider) the SCS, the shorter the symbol period (and slot period). Note that the number of symbols constituting one slot does not necessarily have to be 14 (e.g., 28 or 56 symbols). The number of slots per subframe may also vary depending on the SCS. Furthermore, the SCS may be wider than 240 kHz (e.g., 480 kHz or 960 kHz, as shown in Figure 2).

[0023] The time direction (t) shown in Fig. 2 may be called a time domain, a symbol period, or a symbol time, etc. The frequency direction may be called a frequency domain, a resource block, a subcarrier, a BWP (Bandwidth part), etc.

[0024] The wireless communication system 10 can support coverage enhancement (CE) that expands the coverage of a cell (or physical channel) formed by the gNB 100. Coverage enhancement may provide a mechanism for improving the success rate of reception of various physical channels.

[0025] For example, gNB100 can support repeated transmission of PDSCH (Physical Downlink Shared Channel), and UE200 can support repeated transmission of PUSCH (Physical Uplink Shared Channel).

[0026] Furthermore, multiple types of UEs 200 may be used in the wireless communication system 10. For example, the UEs 200 may be multiple types of terminals with different functions or performance, or supporting different 3GPP releases. The terminals (UEs) may be referred to as a first type terminal and a second type terminal. Furthermore, the term "type" may be replaced with other terms such as generation or release. The first type terminal and the second type terminal may be referred to as an enhanced UE and a legacy UE, respectively. An enhanced UE may be interpreted as a UE that supports the latest release of 3GPP, and a legacy UE may be interpreted as a UE that does not support the latest release.

[0027] A slot configuration pattern for time division duplexing (TDD) may be set in the wireless communication system 10. For example, DDDSU (D: downlink (DL symbol, S: DL / uplink (UL) or guard symbol, U: UL symbol) may be specified (see 3GPP TS38.101-4).

[0028] "D" indicates a slot containing all DL symbols, "S" indicates a slot containing a mixture of DL, UL, and guard symbols (G), and "U" indicates a slot containing all UL symbols.

[0029] (2) Functional Block Configuration of Wireless Communication System Next, a functional block configuration of the wireless communication system 10 will be described. Specifically, a functional block configuration of the UE 200 will be described. Fig. 3 is a functional block configuration diagram of the gNB 100 and the UE 200.

[0030] As shown in FIG. 3 , the UE 200 includes a radio signal transmitting / receiving unit 210, an amplifier unit 220, a modulation / demodulation unit 230, a control signal / reference signal processing unit 240, an encoding / decoding unit 250, a data transmitting / receiving unit 260, and a control unit 270.

[0031] It should be noted that Fig. 3 shows only the main functional blocks relevant to the description of the embodiment, and that the UE 200 (gNB 100) has other functional blocks (e.g., a power supply unit, etc.). Fig. 3 shows the functional block configuration of the UE 200, and for the hardware configuration, please refer to Fig. 13.

[0032] The radio signal transmitting and receiving unit 210 transmits and receives radio signals conforming to NR. The radio signal transmitting and receiving unit 210 can support Massive MIMO, which generates a more directional beam by controlling radio (RF) signals transmitted from multiple antenna elements, Carrier Aggregation (CA), which aggregates and uses multiple component carriers (CCs), and Dual Connectivity (DC), which simultaneously communicates between a UE and two NG-RAN nodes.

[0033] Furthermore, the radio signal transceiver 210 may transmit a physical uplink shared channel. Specifically, the radio signal transceiver 210 may transmit a PUSCH to the network (gNB 100). The radio signal transceiver 210 may support repetition of the PUSCH.

[0034] A plurality of types of repeated transmission of the PUSCH may be defined. Specifically, Repetition type A and Repetition type B may be defined. Repetition type A may be interpreted as a form in which the PUSCH allocated within a slot is repeatedly transmitted. In other words, the PUSCH is 14 symbols or less and cannot be allocated across multiple slots (adjacent slots).

[0035] On the other hand, Repetition type B may be interpreted as repeated transmission of a PUSCH to which 15 or more symbols may be allocated. In this embodiment, it may be permitted to allocate such a PUSCH across multiple slots.

[0036] Furthermore, the radio signal transmitting / receiving unit 210 may transmit a random access preamble as a first message (hereinafter, Msg1) in a random access channel procedure (hereinafter, RACH (Random Access Channel) procedure).

[0037] The radio signal transceiver 210 may receive a second message (hereinafter, Msg2) as a response message (random access response (RAR)) to Msg1 in the RACH procedure.

[0038] After receiving Msg2, the radio signal transceiver 210 may transmit a third message (hereinafter, Msg3) via the PUSCH in the RACH procedure.

[0039] The radio signal transceiver 210 may receive a fourth message (hereinafter, Msg4) as a response message to Msg3 in the RACH procedure (3GPP TS38.321 V16.2.1 §5.1 "Random Access procedure").

[0040] For example, Msg1 may be transmitted via a Physical Random Access Channel (PRACH). Msg1 may be referred to as a PRACH Preamble. Msg2 may be transmitted via a PDSCH. Msg2 may be referred to as a Random Access Response (RAR). Msg3 may be referred to as an RRC Connection Request. Msg4 may be referred to as an RRC Connection Setup.

[0041] The wireless signal transmitting / receiving unit 210 executes repeated transmission of Msg3. In this embodiment, the wireless signal transmitting / receiving unit 210 may constitute a transmitting unit that repeatedly transmits a message. The repeated transmission of Msg3 will be described in detail later.

[0042] The amplifier unit 220 is configured by a PA (Power Amplifier) / LNA (Low Noise Amplifier), etc. The amplifier unit 220 amplifies the signal output from the modulation / demodulation unit 230 to a predetermined power level. The amplifier unit 220 also amplifies the RF signal output from the radio signal transmission / reception unit 210.

[0043] The modem unit 230 performs data modulation / demodulation, transmission power setting, resource block allocation, etc. for each predetermined communication destination (e.g., gNB 100). The modem unit 230 may apply Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform - Spread (DFT-S-OFDM). Furthermore, DFT-S-OFDM may be used not only for the uplink (UL) but also for the downlink (DL).

[0044] The control signal and reference signal processor 240 executes processing related to various control signals transmitted and received by the UE 200 and processing related to various reference signals transmitted and received by the UE 200 .

[0045] Specifically, the control signal / reference signal processing unit 240 receives various control signals, for example, control signals of a radio resource control layer (RRC), transmitted via a predetermined control channel from the gNB 100. In addition, the control signal / reference signal processing unit 240 transmits various control signals to the gNB 100 via a predetermined control channel.

[0046] The control signal / reference signal processor 240 performs processing using reference signals (RS) such as a Demodulation Reference Signal (DMRS) and a Phase Tracking Reference Signal (PTRS).

[0047] DMRS is a terminal-specific reference signal (pilot signal) known between the base station and the terminal to estimate the fading channel used for data demodulation, while PTRS is a terminal-specific reference signal intended to estimate phase noise, which is an issue in high frequency bands.

[0048] In addition to the DMRS and PTRS, the reference signals may also include a Channel State Information-Reference Signal (CSI-RS), a Sounding Reference Signal (SRS), and a Positioning Reference Signal (PRS) for position information.

[0049] The channels include a control channel and a data channel. The control channels may include a Physical Downlink Control Channel (PDCCH), a Physical Uplink Control Channel (PUCCH), a Random Access Channel (RACH, Downlink Control Information (DCI) including a Random Access Radio Network Temporary Identifier (RA-RNTI)), a Physical Broadcast Channel (PBCH), etc.

[0050] Furthermore, the data channel includes a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), etc. Data may refer to data transmitted via a data channel.

[0051] Furthermore, the control signal and reference signal processor 240 may transmit capability information of the UE 200 regarding allocation of the physical uplink shared channel (PUSCH) to the network.

[0052] Specifically, the control signal and reference signal processing unit 240 can transmit UE capability information related to PUSCH allocation (which may include repetition) to the gNB 100. Details of the UE capability information will be described later.

[0053] The encoding / decoding unit 250 performs data division / concatenation and channel coding / decoding for each predetermined communication destination (gNB 100 or another gNB).

[0054] Specifically, the encoding / decoding unit 250 divides the data output from the data transmitting / receiving unit 260 into pieces of a predetermined size, performs channel coding on the divided data, decodes the data output from the modem unit 230, and concatenates the decoded data.

[0055] The data transmitter / receiver 260 transmits and receives Protocol Data Units (PDUs) and Service Data Units (SDUs). Specifically, the data transmitter / receiver 260 assembles and disassembles PDUs / SDUs in multiple layers (such as a Medium Access Control layer (MAC), a Radio Link Control layer (RLC), and a Packet Data Convergence Protocol layer (PDCP)). The data transmitter / receiver 260 also performs data error correction and retransmission control based on Hybrid Automatic Repeat Request (Hybrid ARQ).

[0056] The control unit 270 controls each functional block constituting the UE 200. In particular, in this embodiment, the control unit 270 executes control related to the repetition of the PUSCH for Msg3.

[0057] Specifically, the control unit 270 may simultaneously apply inter-slot frequency hopping and intra-slot frequency hopping to the transmission of messages (eg, Msg3) in the RACH procedure.

[0058] Note that "applied simultaneously" means that both hopping methods are applied within a predetermined period in the time direction, and the predetermined period may be in units of multiple slots or subframes.

[0059] Inter-slot frequency hopping may be interpreted as transmitting the message (or channel) using (hopping to) multiple different frequency (or subcarrier, etc.) positions across multiple slots (see Figure 2).

[0060] Intra-slot frequency hopping may be interpreted as transmitting a message (or a channel) using (hopping to) multiple different frequency (or subcarrier) positions within the same slot. Specific examples of inter-slot frequency hopping and intra-slot frequency hopping will be described later.

[0061] Furthermore, the control unit 270 may determine whether to simultaneously apply inter-slot frequency hopping and intra-slot frequency hopping based on the frequency hopping pattern applied to the repetition of the message.

[0062] Specifically, the control unit 270 may determine whether inter-slot frequency hopping and intra-slot frequency hopping are to be applied simultaneously based on a frequency hopping pattern instructed by the network or defined in advance as a 3GPP specification.

[0063] Furthermore, the control unit 270 may determine a slot in which the message can be repeated (Repetition). Specifically, the control unit 270 may allocate the message to a slot in which repetition is permitted, as instructed by the network or as defined in advance as a 3GPP specification. An example of such repetition allocation will be described later.

[0064] The above-described functionality related to coverage extension may also be provided in the gNB 100. For example, the gNB 100 may include a radio signal transceiver 210 that receives messages (e.g., Msg3) in the RACH procedure from the first-type terminal and the second-type terminal, and a control unit 270 that determines whether the terminal is the first-type terminal or the second-type terminal based on the messages.

[0065] Furthermore, the control unit 270 of the gNB 100 may determine whether the terminal is a first type or a second type in the initial transmission or re-transmission of a message (e.g., Msg3) transmitted via the PUSCH (uplink data channel). Note that, as described above, the first type terminal and the second type terminal may refer to enhanced UE and legacy UE, respectively.

[0066] (3) Operation of the Wireless Communication System Next, a description will be given of the operation of the wireless communication system 10. Specifically, a description will be given of the operation relating to the repetition of the message (Msg3) of the RACH procedure.

[0067] (3.1) Premise Figure 4 shows an example of a random access sequence including a repetition of Msg3. As shown in Figure 4, the UE 200 first transmits Msg1 to the NG-RAN 20 (gNB 100) according to the RACH procedure. As described above, Msg1 may be referred to as a random access preamble.

[0068] The UE 200 receives Msg2 corresponding to Msg1 from the NG-RAN 20. The UE 200 transmits Msg3 corresponding to Msg2 to the NG-RAN 20. As shown in Fig. 4, Msg3 may be transmitted repeatedly. Although not shown, Msg1 and the like may also be transmitted repeatedly.

[0069] The UE 200 may receive Msg4 in response to any one of Msg3 from the NG-RAN 20. The UE 200 may transmit an acknowledgement (HARQ (Hybrid Automatic repeat request)-ACK) in response to Msg4 to the NG-RAN 20.

[0070] FIG. 5 shows an example of a random access sequence including an initial transmission and re-transmission of Msg3.

[0071] The 3GPP specifications prescribe re-transmission of Msg3 as shown in Fig. 5. Re-transmission of Msg3 may be performed when the initial transmission of Msg3 fails (when the network side cannot receive it).

[0072] For the re-transmission of Msg3, resources may be allocated by DCI format 0_0 with CRC scrambled by TC-RNTI (Radio Network Temporary Identifier).

[0073] The repetition of the PUSCH used for transmitting Msg3 (which may include retransmission) may be related to the Type A PUSCH repetition.

[0074] Existing PUSCH mapping types include Type A and Type B. Type A is used only for repetition Type A, and Type B may be used for both repetition Type A and repetition Type B. Existing Types A and B assume allocation in slot units, so the value of L does not need to exceed "14" (number of symbols) (see §6.1.2 of 3GPP TS38.214 V16.2.0).

[0075] (3.2) Overview of Operation Below, operation examples 1 to 3 regarding the repetition of Msg3 (or PUSCH) will be described.

[0076] ・(Operation example 1): Distinguishing between enhanced UE and legacy UE ・(Alt1): Do not distinguish between enhanced UE and legacy UE ・(Alt2): Distinguish only during Msg3 re-transmission ・(Alt3): Distinguish between enhanced UE and legacy UE in Msg1 / Msg3 ・(Operation example 2): Operations related to inter-slot frequency hopping ・Simultaneous use of inter-slot frequency hopping and intra-slot frequency hopping ・Notification of frequency offset ・Notification of hopping pattern for three or more frequencies ・(Operation example 3): Notification of information related to Msg3 Repetition ・PUSCH repetitions for Msg3 ・PUSCH repetitions for initial transmission Msg3 ・PUSCH repetitions for re-transmission Msg3

[0077] (3.3) Operation Example 1 In this operation example, enhanced UE and legacy UE may be distinguished. Fig. 6 shows an example of a random access sequence according to the operation example 1.

[0078] As shown in FIG. 6, the NG-RAN 20 (gNB 100) may determine whether or not Msg3 Repetition is applicable to the UE, i.e., whether the UE is an enhanced UE or a legacy UE, before transmitting Msg3.

[0079] Alternatively, as in the above-described Alt1, it is not necessary to distinguish between enhanced UE and legacy UE in the initial transmission and retransmission of Msg3. In this case, the gNB 100 may notify the UE 200 of the presence or absence of Msg3 Repetition, regardless of the type of UE, and allocate related resources.

[0080] In the case of Alt2, enhanced UE and legacy UE may not be distinguished from each other in the initial transmission, but may be distinguished from each other in the re-transmission.

[0081] In the case of Alt3, enhanced UE and legacy UE may be distinguished in initial transmission and re-transmission.

[0082] In addition, in the case of Alt2, the discrimination between enhanced UE and legacy UE in Msg3 re-transmission may be based on any of the following.

[0083] (Opt1): In Msg3 of the initial transmission, a UE identity that can identify enhanced UE or legacy UE is reported. In this case, repetition does not need to be specified in the initial transmission. If repetition is not specified, resource consumption can be reduced.

[0084] Furthermore, if enhanced UE and legacy UE can be distinguished from each other by Msg3 in the initial transmission, Msg3Repetition in the re-transmission may be instructed.

[0085] (Opt2): Whether or not retransmission is required is instructed depending on whether or not the initial transmission of Msg3 is repetitive. Fig. 7 shows an example of the Msg3 transmission operation flow according to Operation Example 1 (Alt2-Opt2). The NG-RAN 20 (gNB 100) may instruct repetition in the initial transmission of Msg3 regardless of the type of UE, and may determine and / or notify whether or not repetition is required for the UE depending on whether or not Msg3 is being repeatedly transmitted (repetitively) when receiving the initial transmission.

[0086] In addition, in the case of Alt3, handling of enhanced UE and legacy UE may follow one of the following.

[0087] (Opt1): Assign different initial bandwidths to enhanced UE and legacy UE, respectively. (Opt2): Use different RACH preambles to enhanced UE and legacy UE, respectively. (Opt3): Use different RACH occasions to enhanced UE and legacy UE, respectively. (Opt4): Enhanced UE uses a specific OCC (Orthogonal Cover Code) pattern in repeatedly transmitted Msg1. In this case, the capability of UE 200 (UE capability) may also be hidden (hidden / concealed). Furthermore, if a UE is determined to be an enhanced UE, the Repetition of Msg3 may be set in the initial transmission and re-transmission.

[0088] 8 shows an example of allocation of RACH occasions according to operation example 1 (Alt3-Opt2, 3). In the RACH-ConfigGeneric Information Element (IE), msg1-FDMEnhanced may be added in addition to msg1-FDM. RACH-ConfigGeneric is specified in 3GPP TS38.331.

[0089] 8 shows an example of allocation of RACH occasions for enhanced UE and legacy UE when msg1-FDM = 2 and msg1-FDMEnhancedUE = 2 are set. Specifically, two ROs that differ in at least either the time domain or the frequency domain are allocated to the enhanced UE and the legacy UE.

[0090] (3.4) Operation Example 2 In this operation example, inter-slot frequency hopping of Msg3 is supported in Type A PUSCH Repetition.

[0091] FIG. 9 shows an example of simultaneous application of inter-slot frequency hopping and intra-slot frequency hopping of Msg3 according to the second operation example.

[0092] Specifically, the following cases may be supported:

[0093] (Case 1): Select either inter-slot frequency hopping or intra-slot frequency hopping. In this case, two or more offset values ​​may be specified, enabling hopping using three or more frequencies (FH).

[0094] (Case 2): Using both inter-slot frequency hopping and intra-slot frequency hopping simultaneously. As shown in FIG. 9 , by using different offsets (in the frequency direction) for inter-slot frequency hopping and intra-slot frequency hopping, hopping using more frequencies becomes possible.

[0095] 10 shows an example of applying a frequency offset according to operation example 2 (Case 1). In Case 1, the frequency offset value may be determined by any of the following.

[0096] (Opt1): An offset value table specified in 3GPP Release 15 / 16 is specified by FDRA (Frequency Domain Resource Allocation). In this case, the same offset value may be used for inter-slot frequency hopping and intra-slot frequency hopping. Also, two or more offsets may be specified using reserved bits, enabling hopping using three or more frequencies (FH).

[0097] (Opt2): Use a dedicated offset value table for inter-slot frequency hopping

[0098]

[0099] In this case, the offset corresponding to the bit field may be changed for inter-slot frequency hopping, or a pattern for hopping three or more frequencies may be specified by the bit field.

[0100] In addition, in Case 2, the offset value of inter-slot frequency hopping may be determined by any of the following.

[0101] (Opt1): Determined based on the offset value of intra-slot frequency hopping. For example, if the offset value of intra-slot frequency hopping is N_BWP^size / 4, the offset values ​​of inter-slot frequency hopping may be N_BWP^size / 2, -N_BWP^size / 2. Also, if the offset value of intra-slot frequency hopping is N_BWP^size / 2, the offset values ​​of inter-slot frequency hopping may be N_BWP^size / 4, -N_BWP^size / 4.

[0102] Note that such offset value setting is merely an example, and it is sufficient that the offset value for intra-slot frequency hopping and the offset value for inter-slot frequency hopping are different. A rule for calculating such offset values ​​may be set in advance, or the offset values ​​may be notified by signaling from a higher layer (such as RRC).

[0103] (Opt2): Set separately from the offset for intra-slot frequency hopping. For example, in the case of initial transmission of Msg3, the offset may be set by higher layer signaling or the RAR payload (details will be described later). In addition, in the case of re-transmission of Msg3, the offset may be set by higher layer signaling or DCI.

[0104] (3.5) Operation Example 3 In this operation example, Msg3 Repetition-related information is notified to the UE 200. Specifically, the PUSCH repetitions for Msg3 may be defined in advance as a 3GPP specification without being notified. Furthermore, the PUSCH repetitions for Msg3 may be determined according to the frequency (band (or band)) used by the UE 200.

[0105] More specifically, the presence or absence of PUSCH repetitions for Msg3 and / or the frequency hopping pattern may be notified (or specified).

[0106] The frequency hopping pattern may be selected from, for example, inter-slot frequency hopping, intra-slot frequency hopping, or both inter-slot frequency hopping and intra-slot frequency hopping.

[0107] The number of repetitions may also be notified. In this case, the number of slots in which the repetitions can be placed may be specified instead of the number of slots.

[0108] Fig. 11 shows an example of slot allocation of Msg3 according to Operation Example 3. As shown in Fig. 11, in the TDD DDDSU configuration, Msg3 cannot be allocated to consecutive slots (see x marks), and therefore repetition is not possible (it is dropped).

[0109] Therefore, as indicated by "msg3-AggregationFactor on the basis of available slot = 2", when two Msg3s are placed, Msg3 may be assigned to an available U slot.

[0110] The PUSCH repetitions for initial transmission Msg3 may be notified by any one of the following methods or a combination thereof: Furthermore, the PUSCH repetitions for initial transmission Msg3 may also be determined according to the frequency (band (or may be a band)) used by the UE 200.

[0111] Higher layer signaling: For example, PUSCH-ConfigCommon IE or RACH-ConfigCommon IE may be used.

[0112] Msg2 RAR Fig. 12 shows an example of the configuration of MAC RAR according to operation example 3. Specifically, in the case of notification by MAC RAR, any of the following may be selected.

[0113] (Alt1): A MAC RAR with a different configuration is sent to enhanced UE. (Alt2): Implicit notification using information related to UL grant. For example, information related to Transmit Power Control (TPC) command or Modulation and Coding Scheme (MCS) may be linked. In this case, the linked content may be set by a predetermined rule or by the radio base station.

[0114] (Alt3): Notification using a reserved bit (dotted box in the figure). For example, the presence or absence of repetition may be notified by a reserved bit, and other information related to repetition (initial transmission / re-transmission) may be notified by a higher layer.

[0115] For PUSCH repetitions for re-transmission Msg3, any one of the following or a combination thereof may be applied: Furthermore, PUSCH repetitions for re-transmission Msg3 may also be determined according to the frequency (band (or may be a band)) used by UE 200.

[0116] Sharing information related to initial transmission of Msg3 and Msg3Repetition Notification by signaling of higher layers For example, PUSCH-ConfigCommon IE or RACH-ConfigCommon IE may be used.

[0117] - Notification by DCI format 0_0 with CRC scrambled by TC-RNTI Specifically, any of the following may be applied.

[0118] (Alt1): Repetition-related information is implicitly notified according to the CCE (Control channel element) index where the DCI is placed. (Alt2): Repetition-related information is notified using the HARQ process number and reserved bits of the New data indicator. (Alt3): Implicitly notified by DCI information. For example, information related to TDRA, TPC command, and MCS may be linked. In this case, the content of the linking may be set according to a predetermined rule or by the radio base station.

[0119] DCI with CRC scrambled by enhanced UE RNTI The RNTI for the enhanced UE may be assigned by the RAR. Repetition-related information may be reported by the DCI for the enhanced UE.

[0120] (4) Actions and Effects According to the above-described embodiment, the following actions and effects can be obtained. Specifically, the gNB 100 can distinguish between enhanced UE and legacy UE based on a message (e.g., Msg3) transmitted via a PUSCH (uplink data channel). Furthermore, the UE 200 can simultaneously apply inter-slot frequency hopping and intra-slot frequency hopping to message transmission in the RACH procedure.

[0121] Such operation of gNB100 and UE200 can improve performance regarding repetition of the RACH procedure message (Msg3).

[0122] In this embodiment, the gNB100 can distinguish between enhanced UE and legacy UE in the initial transmission or retransmission of the message transmitted via PUSCH.

[0123] In addition, the UE 200 can determine whether to simultaneously apply inter-slot frequency hopping and intra-slot frequency hopping based on the frequency hopping pattern applied to the repetition of the message, and can further determine the slots in which the message can be repeated.

[0124] This can further improve the performance regarding repetition of the message (Msg3) of the RACH procedure.

[0125] (5) Other Embodiments Although the embodiments have been described above, it will be obvious to those skilled in the art that the present invention is not limited to the description of the embodiments, and that various modifications and improvements are possible.

[0126] For example, in the above-described embodiment, an embodiment regarding the repetition of Msg3 and PUSCH has been described, but the above-described operation regarding repetition may be applied to messages in the RACH procedure or other uplink channels.

[0127] Furthermore, the PUSCH may be called a physical uplink shared channel, and does not necessarily have to be a PUSCH as long as it is a channel (physical channel) shared by a plurality of UEs 200 (users) in the UL.

[0128] The block diagram ( FIG. 3 ) used to explain the above-described embodiment shows functional blocks. These functional blocks (components) are realized by any combination of hardware and / or software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are connected directly or indirectly (e.g., via wire, wireless, etc.) and these multiple devices. The functional block may be realized by combining the single device or multiple devices with software.

[0129] Functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission is called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on how each is implemented.

[0130] Furthermore, the above-described gNB 100 and UE 200 (the devices) may function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 13 is a diagram showing an example of the hardware configuration of the devices. As shown in Figure 13, the devices may be configured as a computer including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0131] In the following description, the term "apparatus" can be interpreted as a circuit, a device, a unit, etc. The hardware configuration of the apparatus may be configured to include one or more of the apparatuses shown in the drawings, or may be configured to exclude some of the apparatuses.

[0132] Each functional block of the device (see FIG. 3) is realized by any hardware element of the computer device or a combination of the hardware elements.

[0133] In addition, each function of the device is realized by loading specified software (programs) onto hardware such as processor 1001 and memory 1002, causing processor 1001 to perform calculations, control communication via communication device 1004, and control at least one of reading and writing data in memory 1002 and storage 1003.

[0134] The processor 1001 controls the entire computer by running, for example, an operating system, and may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control unit, an arithmetic unit, and registers.

[0135] The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and executes various processes in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. Furthermore, the various processes described above may be executed by a single processor 1001, or may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The programs may be transmitted from a network via a telecommunications line.

[0136] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), etc. The memory 1002 may also be called a register, a cache, a main memory (primary storage device), etc. The memory 1002 may store a program (program code), a software module, etc., capable of executing a method according to an embodiment of the present disclosure.

[0137] Storage 1003 is a computer-readable recording medium, and may be, for example, at least one of an optical disk such as a Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray disc), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy disk, a magnetic strip, etc. Storage 1003 may also be referred to as an auxiliary storage device. The above-mentioned recording medium may be, for example, a database, a server, or other suitable medium including at least one of memory 1002 and storage 1003.

[0138] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also called, for example, a network device, a network controller, a network card, or a communication module.

[0139] The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize, for example, at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD).

[0140] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, an LED lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0141] Furthermore, each device such as the processor 1001 and the memory 1002 is connected to a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0142] Furthermore, the device may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized by the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0143] Furthermore, the notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB))), other signals, or a combination thereof. Furthermore, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0144] Each aspect / embodiment described in the present disclosure may be applied to at least one of a system using Long Term Evolution (LTE), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, a 4th generation mobile communication system (4G), a 5th generation mobile communication system (5G), Future Radio Access (FRA), New Radio (NR), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other suitable system, and a next-generation system enhanced based on these. Furthermore, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A and 5G) may also be applied.

[0145] The order of the procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed unless it is consistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0146] In the present disclosure, a specific operation described as being performed by a base station may also be performed by its upper node in some cases. In a network consisting of one or more network nodes having a base station, it is clear that various operations performed for communication with a terminal may be performed by at least one of the base station and another network node other than the base station (e.g., MME or S-GW, etc., but are not limited to these). Although the above example illustrates a case where there is one other network node other than the base station, a combination of multiple other network nodes (e.g., MME and S-GW) may also be used.

[0147] Information, signals (information, etc.) may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), or may be input and output via multiple network nodes.

[0148] The input and output information may be stored in a specific location (for example, a memory) or may be managed using a management table. The input and output information may be overwritten, updated, or added to. The output information may be deleted. The input information may be transmitted to another device.

[0149] The determination may be made based on a value represented by one bit (0 or 1), a Boolean value (true or false), or a numerical comparison (e.g., comparison with a predetermined value).

[0150] The aspects / embodiments described in this disclosure may be used alone, in combination, or switched depending on the implementation. Notification of predetermined information (e.g., notification that "X is true") is not limited to explicit notification, but may be implicit (e.g., not notifying the predetermined information).

[0151] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0152] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0153] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0154] Note that terms described in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0155] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0156] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by an index.

[0157] The names used for the above-described parameters are not intended to be limiting in any way. Furthermore, the mathematical expressions using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0158] In this disclosure, terms such as "base station (BS)," "radio base station," "fixed station," "NodeB," "eNodeB (eNB)," "gNodeB (gNB)," "access point," "transmission point," "reception point," "transmission / reception point," "cell," "sector," "cell group," "carrier," and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0159] A base station can accommodate one or more (e.g., three) cells (also called sectors). When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can be provided with communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head: RRH)).

[0160] The terms "cell" or "sector" refer to part or all of the coverage area of ​​a base station and / or base station subsystem that provides communication services within that coverage area.

[0161] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0162] A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0163] At least one of the base station and the mobile station may be referred to as a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile object, the mobile object itself, etc. The mobile object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0164] Furthermore, a base station in the present disclosure may be read as a mobile station (user terminal, the same applies hereinafter). For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a mobile station is replaced with communication between multiple mobile stations (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the mobile station may be configured to have the functions of a base station. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, terms such as an uplink channel and a downlink channel may be read as a side channel.

[0165] Similarly, a mobile station in the present disclosure may be interpreted as a base station. In this case, the base station may be configured to have the functions of a mobile station. A radio frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe. A subframe may further be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0166] Numerology may be communication parameters that apply to the transmission and / or reception of a signal or channel, such as subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering operations performed by the transceiver in the frequency domain, and specific windowing operations performed by the transceiver in the time domain.

[0167] A slot may consist of one or more symbols in the time domain (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol, a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) A slot may be a numerology-based time unit.

[0168] A slot may include multiple minislots. Each minislot may consist of one or more symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0169] The radio frame, subframe, slot, minislot, and symbol all represent time units for transmitting signals, and may be referred to by other names corresponding to the radio frame, subframe, slot, minislot, and symbol.

[0170] For example, one subframe may be referred to as a transmission time interval (TTI), multiple consecutive subframes may be referred to as a TTI, or one slot or one minislot may be referred to as a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0171] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station schedules each user terminal to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) in TTI units. Note that the definition of TTI is not limited to this.

[0172] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0173] In addition, when one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling, and the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0174] A TTI having a time length of 1 ms may be referred to as a regular TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be referred to as a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0175] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0176] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may be determined based on numerology.

[0177] The time domain of an RB may include one or more symbols and may have a length of one slot, one minislot, one subframe, or one TTI, each of which may consist of one or more resource blocks.

[0178] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0179] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0180] A Bandwidth Part (BWP) (which may also be referred to as a fractional bandwidth) may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a common reference point of the carrier. PRBs may be defined in a given BWP and numbered within that BWP.

[0181] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be configured for a UE within one carrier.

[0182] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0183] The above-described structures of the radio frame, subframe, slot, minislot, and symbol are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, and other configurations may be changed in various ways.

[0184] The terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using one or more wires, cables, and / or printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

[0185] The reference signal may also be abbreviated as Reference Signal (RS) and may be called a pilot depending on the applicable standard.

[0186] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0187] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0188] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed therein or that the first element must precede the second element in some way.

[0189] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, when the term "or" is used in this disclosure, it is not intended to be an exclusive or.

[0190] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0191] As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (e.g., searching in a table, database, or other data structure), ascertaining, and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), and the like. Furthermore, "judgment" and "decision" can include regarding resolving, selecting, choosing, establishing, comparing, etc. as having been "judged" or "decided." In other words, "judgment" and "decision" can include regarding some action as having been "judged" or "decided." Furthermore, "judgment (decision)" can be interpreted as "assuming," "expecting," "considering," etc.

[0192] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0193] Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure.

[0194] 10 Wireless communication system 20 NG-RAN 100 gNB 200 UE 210 Radio signal transmitting / receiving unit 220 Amplifier unit 230 Modulation / demodulation unit 240 Control signal / reference signal processing unit 250 Encoding / decoding unit 260 Data transmitting / receiving unit 270 Control unit 1001 Processor 1002 Memory 1003 Storage 1004 Communication device 1005 Input device 1006 Output device 1007 Bus

Claims

1. A receiver that receives downlink control information from a base station; A terminal comprising a control unit that controls retransmission of a message based on a repetition number of times of retransmission of the message in a random access channel procedure, the retransmission number being set in correspondence with information regarding a modulation and coding scheme included in the downlink control information.

2. A terminal as described in claim 1, wherein the control unit controls the number of repetitions of the initial transmission of the message to correspond to information regarding the modulation and coding method included in the uplink permission in the random access channel procedure.

3. A step of receiving downlink control information from a base station; A communication method for a terminal, comprising: a step of controlling retransmission of a message based on a number of times of retransmission of the message in a random access channel procedure, the number being set in correspondence with information regarding a modulation and coding scheme included in the downlink control information.

4. A transmitter that transmits downlink control information to a terminal; A base station comprising a control unit that controls the number of times that the terminal retransmits a message in a random access channel procedure so as to correspond to information regarding a modulation and coding scheme included in the downlink control information.

5. A communication system including a base station and a terminal, The base station, A transmitter that transmits downlink control information to the terminal; Retransmission of a message in a random access channel procedure by the terminal The number of repetitions is determined by the modulation and coding scheme included in the downlink control information. A control unit controls the device to correspond to information related to The terminal includes: a receiving unit that receives the downlink control information from the base station; The retransmission of the message is performed based on the number of times the message has been retransmitted. A communication system including a control unit that controls the communication system to repeat the above.