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

Technical Field

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

Background Art

[0002] The 3rd Generation Partnership Project (3GPP) is standardizing the 5th generation mobile communication system (also called 5G, New Radio (NR) or Next Generation (NG)), and is also promoting the standardization of the next generation called Beyond 5G, 5G Evolution or 6G.

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

[0004] Specifically, studies are underway on the specification of the repetition of the Physical Uplink Shared Channel (PUSCH) used for transmitting the message (Msg3) of the Random Access Channel (RACH) procedure.

Prior Art Documents

Non-Patent Documents

[0005]

Non-Patent Document 1

Summary of the Invention

[0006] Regarding Msg3, although re-transmission is specified, there is room for improvement in the Repetition in such re-transmission and the method for discriminating the terminal (User Equipment, UE).

[0007] Therefore, the following disclosure is made in view of such a situation, and aims to provide a radio base station and a terminal that can further improve the performance regarding the Repetition of the message (Msg3) in the RACH procedure.

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

[0009] One aspect of the present disclosure is a terminal (UE200) including 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 transmitting unit (radio signal transmitting and receiving unit 210) that repeatedly transmits the message.

Brief Description of the Drawings

[0010]

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DETAILED DESCRIPTION OF THE INVENTION

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

[0012] (1) Overall schematic configuration of the wireless communication system FIG. 1 is an overall schematic configuration diagram of a wireless communication system 10 according to the present embodiment. The wireless communication system 10 is a wireless communication system compliant with 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] Note that the wireless communication system 10 may be a wireless communication system compliant with a system called Beyond 5G, 5G Evolution, or 6G.

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

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

[0016] gNB 100 is a radio base station compliant with NR and performs wireless communication with UE 200 according to NR. gNB 100 and UE 200 can support Massive MIMO that generates a more directional beam BM by controlling wireless signals transmitted from a plurality of antenna elements, carrier aggregation (CA) that bundles and uses a plurality of component carriers (CCs), and dual connectivity (DC) that enables simultaneous communication between the UE and each of a plurality of 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 In FR1, a Sub - Carrier Spacing (SCS) of 15, 30 or 60 kHz may be used, and a bandwidth (BW) of 5 - 100 MHz may be used. FR2 is at a higher frequency than FR1, and an SCS of 60 or 120 kHz (240 kHz may be included) may be used, and a bandwidth (BW) of 50 - 400 MHz may be used.

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

[0020] Also, 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. Furthermore, DFT - S - OFDM may be applied not only to the uplink (UL) but also to the downlink (DL).

[0021] Figure 2 shows a configuration example of a radio frame, sub - frame, and slot used in the wireless communication system 10.

[0022] As shown in Figure 2, one slot is composed of 14 symbols, and as the SCS becomes larger (wider), the symbol period (and slot period) becomes shorter. Note that the number of symbols constituting one slot does not necessarily have to be 14 symbols (for example, 28, 56 symbols). Also, the number of slots per sub - frame may vary depending on the SCS. Furthermore, the SCS may be wider than 240 kHz (for example, as shown in Figure 2, 480 kHz, 960 kHz).

[0023] Note that the time direction (t) shown in FIG. 2 may also be referred to as a time domain, a symbol period, a symbol time, etc. Also, the frequency direction may also be referred to as 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 the cell (or a physical channel) formed by the gNB 100. In coverage enhancement, a mechanism for increasing the reception success rate of various physical channels may be provided.

[0025] For example, the gNB 100 can support repeated transmission of the PDSCH (Physical Downlink Shared Channel), and the UE 200 can support repeated transmission of the PUSCH (Physical Uplink Shared Channel).

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

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

[0028] "D" indicates a slot containing all DL symbols, and "S" indicates a slot in which DL, UL, and guard symbols (G) are mixed. "U" indicates a slot containing all UL symbols.

[0029] (2) Functional block configuration of the wireless communication system Next, the functional block configuration of the wireless communication system 10 will be described. Specifically, the 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 wireless signal transceiver 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 transceiver unit 260, and a control unit 270.

[0031] Note that in FIG. 3, only the main functional blocks related to the description of the embodiment are shown, and it should be noted that the UE 200 (gNB 100) has other functional blocks (for example, a power supply unit, etc.). Also, FIG. 3 shows the functional block configuration of the UE 200. For the hardware configuration, refer to FIG. 13.

[0032] The wireless signal transceiver unit 210 transmits and receives wireless signals according to NR. The wireless signal transceiver unit 210 can support Massive MIMO that generates a more directional beam by controlling the wireless (RF) signals transmitted from a plurality of antenna elements, carrier aggregation (CA) that bundles and uses a plurality of component carriers (CC), and dual connectivity (DC) that enables simultaneous communication between the UE and two NG-RAN Nodes respectively.

[0033] Also, the wireless signal transceiver 210 may transmit a physically uplink shared channel. Specifically, the wireless signal transceiver 210 may transmit PUSCH towards the network (gNB100). The wireless signal transceiver 210 may support repetition transmission of PUSCH.

[0034] Multiple types of repetition transmission of 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 repetitively transmitted. That is, PUSCH is 14 symbols or less, and there is no possibility of being allocated across multiple slots (adjacent slots).

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

[0036] Also, in the random access channel procedure (hereinafter, RACH (Random Access Channel) procedure), the wireless signal transceiver 210 may transmit a random access preamble as a first message (hereinafter, Msg1).

[0037] The wireless 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 wireless signal transceiver 210 may transmit a third message (hereinafter, Msg3) via PUSCH in the RACH procedure.

[0039] The wireless signal transceiver unit 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 the PRACH (Physical Random Access Channel). Msg1 may be referred to as a PRACH Preamble. Msg2 may be transmitted via the PDSCH. Msg2 may be referred to as a RAR (Random Access Response). Msg3 may be referred to as a RRC Connection Request. Msg4 may be referred to as a RRC Connection Setup.

[0041] The wireless signal transceiver unit 210 executes repeated transmission of Msg3. In the present embodiment, the wireless signal transceiver unit 210 may constitute a transmission unit that repeatedly transmits messages. Details of the repeated transmission of Msg3 will be described later.

[0042] The amplifier unit 220 is composed of 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. Also, the amplifier unit 220 amplifies the RF signal output from the wireless signal transceiver unit 210.

[0043] The modulation / demodulation unit 230 executes data modulation / demodulation, transmission power setting, resource block allocation, etc. for each predetermined communication destination (such as gNB100). In the modulation / demodulation unit 230, Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform - Spread (DFT-S-OFDM) may be applied. Also, 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 processing unit 240 performs 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 and reference signal processing unit 240 receives various control signals transmitted from the gNB 100 via a predetermined control channel, for example, control signals of the Radio Resource Control (RRC) layer. Also, the control signal and reference signal processing unit 240 transmits various control signals to the gNB 100 via a predetermined control channel.

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

[0047] DMRS is a reference signal (pilot signal) known between the base station and the terminal for each terminal for estimating the fading channel used for data demodulation. PTRS is a reference signal for each terminal for the purpose of estimating phase noise, which is a problem in high frequency bands.

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

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

[0050] In addition, the data channel includes a Physical Downlink Shared Channel (PDSCH), a Physical Uplink Shared Channel (PUSCH), etc. The data may mean the data transmitted via the data channel.

[0051] In addition, the control signal / reference signal processing unit 240 may transmit the UE 200's capability information regarding the allocation of the Physical Uplink Shared Channel (PUSCH) to the network.

[0052] Specifically, the control signal / reference signal processing unit 240 can transmit UE Capability Information regarding the allocation of PUSCH (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 segmentation / concatenation, channel coding / decoding, etc. for each predetermined communication destination (gNB 100 or another gNB).

[0054] Specifically, the encoding / decoding unit 250 divides the data output from the data transmission / reception unit 260 into a predetermined size and performs channel coding on the divided data. Also, the encoding / decoding unit 250 decodes the data output from the modulation / demodulation unit 230 and concatenates the decoded data.

[0055] The data transmission / reception unit 260 performs the transmission and reception of Protocol Data Unit (PDU) and Service Data Unit (SDU). Specifically, the data transmission / reception unit 260 performs the assembly / disassembly of PDU / SDU in a plurality of layers (such as the Medium Access Control layer (MAC), the Radio Link Control layer (RLC), and the Packet Data Convergence Protocol layer (PDCP)). Also, the data transmission / reception unit 260 performs error correction and retransmission control of data 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 performs control regarding the repetition of 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 a message (for example, Msg3) in the RACH procedure.

[0058] Note that simultaneously applying means that both hopings are applied within a predetermined period in the time direction, and the predetermined time may be in units of a plurality of slots or sub-frames.

[0059] Inter-slot frequency hopping may be interpreted as the message (which may also be a channel) being transmitted using (hopping to) a plurality of different frequency positions (which may also be sub-carriers, etc.) among a plurality of slots (see Figure 2).

[0060] Intra-slot frequency hopping may be interpreted as the message (which may also be a channel) being transmitted using (hopping to) a plurality of different frequency positions (which may also be sub-carriers, etc.) within the same slot. Specific examples of inter-slot frequency hopping and intra-slot frequency hopping will be described later.

[0061] Also, the control unit 270 may determine the simultaneous application of 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 to simultaneously apply inter-slot frequency hopping and intra-slot frequency hopping based on the frequency hopping pattern instructed by the network or specified in advance as a 3GPP specification.

[0063] Also, the control unit 270 may determine the slots in which the repetition of the message is possible. Specifically, the control unit 270 may allocate the message to the slots in which repetition is possible as instructed by the network or specified in advance as a 3GPP specification. Examples of such repetition arrangements will be described later.

[0064] In addition, the function related to the above-mentioned coverage expansion may also be provided in gNB100. For example, gNB100 may include a radio signal transceiver 210 that receives messages (e.g., Msg3) in the RACH procedure from the first type of terminal and the second type of terminal, and a control unit 270 that discriminates the first type of terminal or the second type of terminal based on the message.

[0065] Also, the control unit 270 of gNB100 may discriminate the first type of terminal or the second type of terminal in the initial transmission or re-transmission of a message (e.g., Msg3) transmitted via the PUSCH (uplink data channel). As described above, the first type of terminal and the second type of terminal may respectively mean an enhanced UE and a legacy UE.

[0066] (3) Operation of the wireless communication system Next, the operation of the wireless communication system 10 will be described. Specifically, the operation regarding the Repetition of the message (Msg3) in the RACH procedure will be described.

[0067] (3.1) Premise FIG. 4 shows an example of a random access sequence including the Repetition of Msg3. As shown in FIG. 4, UE200 first transmits Msg1 to NG-RAN20 (gNB100) according to the RACH procedure. Msg1 may be called a random access preamble as described above.

[0068] UE200 receives Msg2 corresponding to Msg1 from NG-RAN20. UE200 transmits Msg3 corresponding to Msg2 to NG-RAN20. As shown in FIG. 4, Msg3 may be repeatedly transmitted. Although not shown, Msg1 etc. may also be repeatedly transmitted.

[0069] UE 200 may receive Msg4 from NG-RAN 20 for any one of Msg3. UE 200 may send a confirmation response (HARQ (Hybrid Automatic Repeat Request)-ACK) for Msg4 to NG-RAN 20.

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

[0071] As shown in Figure 5, in the 3GPP specification, the re-transmission of Msg3 is defined. The re-transmission of Msg3 may be executed when the initial transmission of Msg3 fails (cannot be received on the network side).

[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 PUSCH used for the transmission of Msg3 (which may include re-transmission) may be related to Type A PUSCH Repetition.

[0074] As existing PUSCH mapping types, there are Type A and Type B. Type A is only used for repetition Type A, and Type B may be used for both repetition Type A and repetition Type B. In the existing Type A and Type B, since slot-based allocation is assumed, the value of L may not exceed "14" (number of symbols) (see §6.1.2 of 3GPP TS38.214 V16.2.0).

[0075] (3.2) Operation Summary The following describes Operation Examples 1 to 3 regarding the Repetition of Msg3 (which may be PUSCH).

[0076] ·(Operation Example 1): Discrimination between enhanced UE and legacy UE ·(Alt1): Do not discriminate between enhanced UE and legacy UE ·(Alt2): Discriminate only during Msg3 re - transmission ·(Alt3): Discriminate 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 with 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 discriminated. FIG. 6 shows an example of a random access sequence according to Operation Example 1.

[0078] As shown in FIG. 6, NG - RAN 20 (gNB 100) may discriminate, before transmitting Msg3, whether the UE to which Msg3 Repetition is applicable, that is, whether it is an enhanced UE or a legacy UE.

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

[0080] In the case of Alt2, it may not be necessary to distinguish between the enhanced UE and the legacy UE in the initial transmission, and it may be necessary to distinguish between the enhanced UE and the legacy UE in the re-transmission.

[0081] In the case of Alt3, it may be necessary to distinguish between the enhanced UE and the legacy UE in the initial transmission and re-transmission.

[0082] Also, in the case of Alt2, the discrimination between the enhanced UE and the legacy UE in the Msg3 re-transmission may follow any of the following.

[0083] ·(Opt1): Report a UE identity that can identify the enhanced UE or the legacy UE in the Msg3 of the initial transmission In this case, Repetition may not be indicated in the initial transmission. When Repetition is not indicated, resource consumption can be suppressed.

[0084] Also, when the enhanced UE and the legacy UE can be discriminated by the Msg3 of the initial transmission, Msg3 Repetition in the re-transmission may be indicated.

[0085] ·(Opt2): Whether re - transmission is required is indicated according to the presence or absence of Repetition in the initial transmission of Msg3 Figure 7 shows an example of the Msg3 transmission operation flow according to Operation Example 1 (Alt2 - Opt2). NG - RAN20 (gNB100) may indicate Repetition in the initial transmission of Msg3 regardless of the type of UE, and determine and / or notify whether Repetition is possible for the UE according to whether Msg3 is repeatedly transmitted (Repetition) at the time of receiving the initial transmission.

[0086] Also, in the case of Alt3, the handling regarding the enhanced UE and the legacy UE may follow any of the following.

[0087] ·(Opt1): Allocate different initial bandwidths for the enhanced UE and the legacy UE respectively ·(Opt2): Use different RACH preambles for the enhanced UE and the legacy UE respectively ·(Opt3): Use different RACH occasions for the enhanced UE and the legacy UE respectively ·(Opt4): The enhanced UE uses a specific OCC (Orthogonal Cover Code) pattern in the repeatedly transmitted Msg1 In this case, the UE capability of UE200 may also be concealed (hidden). Also, when it is determined as an enhanced UE, Repetition of Msg3 may be set in the initial transmission and re - transmission.

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

[0089] In Figure 8, an example of the allocation of RACH occasions for enhanced UEs and legacy UEs when msg1-FDM = 2 and msg1-FDMEnhancedUE = 2 is set is shown. Specifically, two ROs with at least one of the time domain or the frequency domain being different are allocated to both enhanced UEs and legacy UEs.

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

[0091] Figure 9 shows an example of the simultaneous application of inter-slot frequency hopping and intra-slot frequency hopping of Msg3 according to Operation Example 2.

[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, offset values may be specified as two or more to enable hopping (FH) using three or more frequencies.

[0094] ·(Case 2): Use 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] FIG. 10 shows an application example of the frequency offset according to Operation Example 2 (Case 1). In the case of Case 1, the frequency offset value may be determined by any of the following.

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

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

[0098]

Table 1

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

[0100] Also, in the case of 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, when 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 and -N_BWP^size / 2. Also, when 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 and -N_BWP^size / 4.

[0102] Note that such setting of offset values is just an example, and the offset value of intra-slot frequency hopping and the offset value of inter-slot frequency hopping may be made different. Such a calculation rule of the offset value may be preset, or the offset value may be notified by signaling of a higher layer (such as RRC).

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

[0104] (3.5) Operation Example 3 In this operation example, Msg3 Repetition related information is notified to UE200. Specifically, for PUSCH repetitions for Msg3, it may be pre-specified as a 3GPP specification without notification. Also, PUSCH repetitions for Msg3 may be determined according to the operating frequency (which may be a band) of UE200.

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

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

[0107] Also, the number of repetitions may be notified. In this case, instead of the number of slots, the slot (or slots) in which repetitions can be arranged may be specified.

[0108] FIG. 11 shows an example of slot arrangement of Msg3 according to Operation Example 3. As shown in FIG. 11, in the TDD DDDSU configuration, since Msg3 cannot be arranged in consecutive slots (see the x marks), repetitions cannot be performed (dropped).

[0109] Therefore, as shown as "msg3-AggregationFactor on the basis of available slot = 2", when two Msg3s are arranged, they may be assigned to the available U slots for arranging Msg3.

[0110] For PUSCH repetitions for initial transmission Msg3, it may be signaled by any one of, or a combination of, the following. Also, PUSCH repetitions for initial transmission Msg3 may be determined according to the operating frequency (which may be a band) of UE200.

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

[0112] · Msg2 RAR FIG. 12 shows a configuration example of a MAC RAR according to Operation Example 3. Specifically, in the case of notification by MAC RAR, any one of the following may be selected.

[0113] · (Alt1): Transmit a MAC RAR with a different configuration to the enhanced UE · (Alt2): Implicitly signal using information related to the UL grant (uplink grant) For example, information related to the Transmit Power Control (TPC) command or Modulation and Coding Scheme (MCS) may be associated. Also, in this case, the content to be associated may be set according to a predetermined rule or by the radio base station.

[0114] · (Alt3): Signal using reserved bits (dotted frames in the figure) For example, whether there is repetition may be signaled by the reserved bits, and other repetition (initial transmission / re - transmission) related information may be signaled by the higher layer.

[0115] For PUSCH repetitions for re - transmission Msg3, any one of the following, or a combination thereof, may be applicable. Also, PUSCH repetitions for re - transmission Msg3 may be determined according to the operating frequency (which may be a band) of UE200.

[0116] · Share the related information of the initial transmission of Msg3 and Msg3 Repetition · Notification by upper layer signaling For example, a PUSCH - ConfigCommon IE, an RACH - ConfigCommon IE, etc. may be used.

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

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

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

[0120] (4) Function and Effect According to the above-described embodiments, the following function and effect can be obtained. Specifically, the gNB 100 can discriminate between an enhanced UE and a legacy UE based on a message (e.g., Msg3) transmitted via the PUSCH (uplink data channel). Further, the UE 200 can simultaneously apply inter-slot frequency hopping and intra-slot frequency hopping to the transmission of messages in the RACH procedure.

[0121] By such operations of the gNB 100 and the UE 200, the performance regarding the repetition of the message (Msg3) in the RACH procedure can be improved.

[0122] In the present embodiment, the gNB 100 can discriminate between an enhanced UE and a legacy UE in the first transmission or retransmission of the message transmitted via the PUSCH.

[0123] Further, the UE 200 can determine the simultaneous application of 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 repetition of the message is possible.

[0124] Therefore, the performance regarding the repetition of the message (Msg3) in the RACH procedure can be further improved.

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

[0126] For example, in the above-described embodiments, the embodiments regarding Msg3 and the repetition of PUSCH have been described. However, the operations regarding the above-described repetition may be applied to the messages in the RACH procedure or other uplink channels.

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

[0128] Also, the block configuration diagram (FIG. 3) used in the description of the above-described embodiments shows blocks of functional units. These functional blocks (components) are realized by an arbitrary combination of at least one of hardware and software. Also, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically combined device, or two or more physically or logically separated devices may be directly or indirectly (for example, using wired, wireless, etc.) connected and realized using these multiple devices. The functional block may be realized by combining software with the above one device or the above multiple devices.

[0129] Functions include, but are not limited to, judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, regarded as, notification (broadcasting), notification (notifying), communication, forwarding, configuration, reconfiguration, allocation (allocating, mapping), assignment, etc. For example, a functional block (component) that functions as transmission is called a transmission unit or a transmitter. As described above, the realization method is not particularly limited.

[0130] Furthermore, the above-described gNB 100 and UE 200 (the device) may function as a computer that performs the processing of the wireless communication method of the present disclosure. FIG. 13 is a diagram showing an example of the hardware configuration of the device. As shown in FIG. 13, the device may be configured as a computer device 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, and the like.

[0131] In the following description, the term "device" can be read as a circuit, a device, a unit, or the like. The hardware configuration of the device may be configured to include one or more of each device shown in the figure, or may be configured without including some devices.

[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] Also, each function in the device is realized by causing the processor 1001 to perform calculations by loading a predetermined software (program) onto hardware such as the processor 1001 and the memory 1002, controlling communication by the communication device 1004, or controlling at least one of reading and writing data in the memory 1002 and the storage 1003.

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

[0135] Also, the processor 1001 reads a program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiments is used. Further, the above various processes may be executed by one 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. Note that the program may be transmitted from a network via a telecommunication line.

[0136] The memory 1002 is a computer-readable recording medium and may be constituted by at least one of, for example, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), Random Access Memory (RAM), etc. The memory 1002 may be referred to as a register, cache, main memory (main storage device), etc. The memory 1002 can store a program (program code), software module, etc. capable of executing the method according to an embodiment of the present disclosure.

[0137] Storage 1003 is a computer-readable recording medium, which may be composed of at least one of, for example, optical discs such as Compact Disc ROM (CD-ROM), hard disk drives, flexible disks, magneto-optical disks (e.g., compact discs, digital versatile discs, Blu-ray (registered trademark) discs), smart cards, flash memories (e.g., cards, sticks, key drives), floppy (registered trademark) disks, magnetic strips, etc. Storage 1003 may be referred to as an auxiliary storage device. The above-mentioned recording medium may be, for example, a database, a server, or other appropriate media including at least one of memory 1002 and storage 1003.

[0138] Communication device 1004 is hardware (a transmission / reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, etc.

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

[0140] Input device 1005 is an input device for receiving external input (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). Output device 1006 is an output device for performing external output (e.g., a display, a speaker, an LED lamp, etc.). Note that input device 1005 and output device 1006 may have an integrated configuration (e.g., a touch panel).

[0141] Also, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus or may be configured using different buses for 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), a Field Programmable Gate Array (FPGA), etc., and some or all of each functional block may be realized by the hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0143] Also, 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 implemented by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), upper layer signaling (e.g., RRC signaling, Medium Access Control (MAC) signaling, notification information (Master Information Block (MIB), System Information Block (SIB))), other signals, or a combination thereof. Also, 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, etc.

[0144] Each aspect / embodiment described in the present disclosure may be applied to at least one of systems using Long Term Evolution (LTE), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 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), other suitable systems, and next-generation systems extended based on these. Further, a plurality of systems may be combined (for example, a combination of at least one of LTE and LTE-A and 5G, etc.) and applied.

[0145] The processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present disclosure may be reordered as long as there is no contradiction. For example, for the methods described in the present disclosure, the elements of various steps are presented using an exemplary order and are not limited to the specific order presented.

[0146] The specific operations assumed to be performed by the base station in the present disclosure may, in some cases, be performed by its upper node. In a network consisting of one or more network nodes having a base station, various operations performed for communication with a terminal can clearly be performed by at least one of the base station and other network nodes other than the base station (for example, but not limited to, an MME or an S-GW). Although the case where there is one other network node other than the base station has been exemplified above, a combination of a plurality of other network nodes (for example, an MME and an S-GW) may also be possible.

[0147] Information, signals (such as information) can be output from an upper layer (or a lower layer) to a lower layer (or an upper layer). They may also be input and output via a plurality of 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 can be overwritten, updated, or appended. The output information may be deleted. The input information may be transmitted to other devices.

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

[0150] Each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched and used during execution. Also, the notification of predetermined information (for example, the notification of "being X") is not limited to being explicitly performed, and may be performed implicitly (for example, by not performing the notification of the predetermined information).

[0151] Software should be broadly construed to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc., whether called software, firmware, middleware, microcode, a hardware description language, or by any other name.

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

[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., which may be referred to throughout the above description, may be represented by voltage, current, 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). Also, a signal may be a message. Also, a Component Carrier (CC) may be referred to as a carrier frequency, a cell, a frequency carrier, etc.

[0155] The terms "system" and "network" as used in this disclosure are used interchangeably.

[0156] In addition, the information, parameters, etc. described in this disclosure may be represented using absolute values, relative values from a predetermined value, or 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 limiting in any way. Furthermore, mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in this disclosure. Since various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements are not 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", "component carrier", etc. may be used interchangeably. A base station may also be referred to by terms such as macro cell, small cell, femto cell, pico cell, etc.

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

[0160] The term "cell" or "sector" refers to a part or the whole of the coverage area of at least one of a base station that provides communication services in this coverage and a base station subsystem.

[0161] In the present disclosure, terms such as "Mobile Station (MS)", "user terminal", "User Equipment (UE)", and "terminal" can 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 terms.

[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. Note that at least one of the base station and the mobile station may be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), a moving body that moves without a driver (e.g., a drone, a self-driving vehicle, etc.), or a robot (humanoid or non-humanoid). Note that at least one of the base station and the mobile station also includes a device that does 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] Also, the base station in the present disclosure may be read as a mobile station (user terminal, the same hereinafter). For example, for a configuration in which communication between the base station and the mobile station is replaced with communication between a plurality of mobile stations (which may be referred to as, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.), each aspect / embodiment of the present disclosure may be applied. In this case, the functions of the base station may be configured as functions of the mobile station. Also, terms such as "uplink" and "downlink" may be read as terms corresponding to communication between terminals (for example, "side"). For example, the uplink channel, downlink channel, etc. may be read as side channels.

[0165] Similarly, the mobile station in the present disclosure may be read as a base station. In this case, the functions of the mobile station may be configured as functions of the base station. The 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. The subframe may further be composed of one or more slots in the time domain. The subframe may have a fixed time length (for example, 1 ms) that does not depend on numerology.

[0166] Numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. Numerology may indicate, for example, at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering processing performed by the transceiver in the frequency domain, specific windowing processing performed by the transceiver in the time domain, etc.

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

[0168] A slot may include a plurality of mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. Also, a mini-slot may be called a sub-slot. A mini-slot may be composed of a smaller number of symbols than a slot. A Physical Downlink Shared Channel (PDSCH) (or Physical Uplink Shared Channel (PUSCH)) transmitted in a time unit larger than a mini-slot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be called PDSCH (or PUSCH) mapping type B.

[0169] A radio frame, a sub-frame, a slot, a mini-slot, and a symbol all represent time units for signal transmission. Different names corresponding to each of them may also be used.

[0170] For example, one sub-frame may be called a Transmission Time Interval (TTI), or a plurality of consecutive sub-frames may be called a TTI, or one slot or one mini-slot may be called a TTI. That is, at least one of the sub-frame and the TTI may be a sub-frame (1 ms) in existing LTE, or 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, a mini-slot, etc. instead of a sub-frame.

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

[0172] TTI may be a transmission time unit such as a channel-coded data packet (transport block), code block, codeword, etc., or may be a processing unit such as scheduling and link adaptation. Note that when TTI is given, the time interval (e.g., the number of symbols) in which a transport block, code block, codeword, etc. are actually mapped may be shorter than the TTI.

[0173] Note that when one slot or one mini-slot is called TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) may be the minimum time unit for scheduling. Also, the number of slots (mini-slots) constituting the minimum time unit for the scheduling may be controlled.

[0174] A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel.8 - 12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, etc. A TTI shorter than the normal TTI may be called a shortened TTI, short TTI, partial TTI (partial or fractional TTI), shortened subframe, short subframe, mini-slot, sub-slot, slot, etc.

[0175] Note that a long TTI (e.g., a normal TTI, subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, or a short TTI (e.g., a shortened TTI, etc.) may be read as a TTI having a TTI length less than that of the long TTI and not less than 1 ms.

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

[0177] Also, the time domain of an RB may include one or more symbols, and may be the length of 1 slot, 1 mini-slot, 1 sub-frame, or 1 TTI. 1 TTI, 1 sub-frame, etc. may each be composed of one or more resource blocks.

[0178] Note that one or more RBs may be referred to as Physical Resource Block (PRB), Sub-Carrier Group (SCG), Resource Element Group (REG), PRB pair, RB pair, etc.

[0179] Also, a resource block may be composed of one or more Resource Elements (REs). For example, 1 RE may be a radio resource area of 1 subcarrier and 1 symbol.

[0180] A Bandwidth Part (BWP) (which may also be called a partial bandwidth, etc.) may represent a subset of consecutive common resource blocks (RBs) for a certain numerology in a certain carrier. Here, the common RB may be specified by the index of the RB based on the common reference point of the carrier. A PRB is defined in a certain BWP and may be 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 within one carrier for a UE.

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

[0183] The structures such as the radio frames, subframes, slots, minislots, and symbols described above 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, and the number of symbols within a TTI, symbol length, Cyclic Prefix (CP) length, etc. can be changed in various ways.

[0184] The terms "connected" and "coupled", or any variations thereof, mean any direct or indirect connection or coupling between two or more elements, and can 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 can be physical, logical, or a combination thereof. For example, "connected" may be read as "accessed". As used in the present disclosure, two elements can be considered to be "connected" or "coupled" to each other using at least one of one or more wires, cables, and printed electrical connections, and also, as some non-limiting and non-exhaustive examples, electromagnetic energy having wavelengths in the radio frequency region, microwave region, and optical (both visible and invisible) region.

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

[0186] In the present disclosure, the description "based on" does not mean "only based on" unless otherwise specified. In other words, the description "based on" means both "only based on" and "at least based on".

[0187] In the configuration of each of the above devices, the "means" may be replaced with a "section", "circuit", "device", etc.

[0188] Any reference to an element using designations such as "first", "second", etc. used in the present disclosure does not generally limit the quantity or order of those elements. These designations can be used in the present disclosure as a convenient way to distinguish between two or more elements. Therefore, references to the first and second elements do not mean that only two elements can be employed there, or that the first element must precede the second element in any form.

[0189] In the present disclosure, when terms such as "include", "including" and their variants are used, these terms are intended to be inclusive, similar to the term "comprising". Furthermore, the term "or" used in the present disclosure is not intended to be an exclusive disjunction.

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

[0191] As used herein, the terms "determining" and "determination" may encompass a wide variety of actions. "Determining" and "determination" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching a table, database, or other data structure), ascertaining, and considering something as having been "determined". Also, "determining" and "determination" may include considering something as having been "determined" after receiving (e.g., receiving information), transmitting (e.g., transmitting information), inputting, outputting, accessing (e.g., accessing data in memory), and the like. Further, "determining" and "determination" may include considering something as having been "determined" after resolving, selecting, choosing, establishing, comparing, and the like. That is, "determining" and "determination" may include considering that some action has been "determined". Also, "determining (determination)" may be read as "assuming", "expecting", "considering", etc.

[0192] As used herein, the term "A is different from B" may mean that "A and B are different from each other". Note that the term may also mean that "A and B are each different from C". Terms such as "separated", "coupled", etc. may also be interpreted in the same way as "different".

[0193] Although the present disclosure has been described in detail above, it is obvious to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented as modifications and variations without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is for illustrative purposes only and does not have any limiting meaning for the present disclosure.

Explanation of Signs

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

Claims

1. A receiving unit that receives downlink control information from a base station, Based on the number of HARQ retransmission repetitions of a message in a random access channel procedure, which is set in association with information regarding the modulation and coding scheme included in the downlink control information, a terminal comprising a control unit that controls the HARQ retransmission of the message to be repeated using type A physical uplink shared channel repetitions.

2. The terminal according to claim 1, wherein the control unit controls the number of repetitions of the first transmission of the message to be associated with information regarding the modulation and coding scheme included in the uplink grant 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 the HARQ retransmission of the message to be repeated using type A physical uplink shared channel repetitions based on the number of HARQ retransmission repetitions of the message in a random access channel procedure, which is set in association with information regarding the modulation and coding scheme included in the downlink control information.

4. A transmitting unit that transmits downlink control information to a terminal, A base station comprising a control unit that controls the HARQ retransmission of the message to be repeated using type A physical uplink shared channel repetitions by associating the number of HARQ retransmission repetitions of the message in a random access channel procedure by the terminal with information regarding the modulation and coding scheme included in the downlink control information.

5. In a communication system comprising a base station and a terminal, The base station, A transmitting unit that transmits downlink control information to the terminal, Comprises a control unit that controls the number of HARQ retransmission repetitions of the message in a random access channel procedure by the terminal to be associated with information regarding the modulation and coding scheme included in the downlink control information, The terminal, A receiving unit that receives the downlink control information from the base station, A communication system comprising a control unit that controls the HARQ retransmission of the message to be repeated using type A physical uplink shared channel repetitions based on the number of HARQ retransmission repetitions of the message.

Images